SURFACE CLEANING APPARATUS
This application claims the benefit of the filing date of U.S. Provisional Patent Application Ser. No. 62/559,151, filed Sep. 15, 2017, the specification of which is incorporated herein by reference. The present subject matter of the teachings described herein relates to a surface cleaning apparatus which may be operable as at least one of a sweeper, a vacuum cleaner, a hard floor cleaning apparatus and an extractor and optionally, the surface cleaning apparatus may be operable as two or more of these apparatus. Extractors are a type of surface cleaning apparatus which have a reservoir to apply a cleaning solution to, e.g., carpet and a nozzle to extract the used cleaning solution from the carpet. A separation system is provided to separate the used cleaning solution, which is entrained in dirty air that is drawn into the extractor, and to store the used cleaning solution in a used reservoir. Typically, the nozzle of an extractor is not designed to remove large particulate matter from carpet (e.g., popcorn) and accordingly, a carpet may have to be cleaned using a vacuum cleaner prior to using an extractor to clean the carpet. Various different surface cleaning apparatus are known which use different cleaning stages that are arranged in series. These include EP 1707094 (Kim et al.), U.S. Pat. No. 7,473,289 (Oh et at.) and U.S. Pat. No. 5,135,552 (Weistra). Various different extractor designs are also known. This summary is intended to introduce the reader to the more detailed description that follows and not to limit or define any claimed or as yet unclaimed invention. One or more inventions may reside in any combination or sub-combination of the elements or process steps disclosed in any part of this document including its claims and figures. According to one aspect of this disclosure, a surface cleaning apparatus may be operable as a traditional vacuum cleaner (e.g., the dirty air inlet may be configured as a traditional vacuum cleaner dirty air inlet to draw in particulate matter, including larger particulate matter, which may then be removed from an air stream. This may be referred to as a vacuum cleaning mode or a dry cleaning mode as a cleaning solution may not yet have been applied to the surface being cleaned. The surface cleaning apparatus may also be operable in an extractor or wet cleaning mode, in which it is operable to treat an incoming dirty fluid stream that contains liquid and may also include dirt and other solid debris. Providing a single apparatus that can be operable in both wet and dry cleaning modes may allow a user to use a single apparatus to clean a surface (e.g., carpet) prior to applying a cleaning solution to clean the surface and then to use the same apparatus to apply a cleaning solution to the surface and to remove the cleaning solution from the surface. An advantage of this design is that a user need not use or store two separate machines. In order to operate in an extractor mode, the surface cleaning apparatus may include a liquid distribution system, including an onboard liquid reservoir and a spray or application nozzle, whereby the apparatus may apply one or more of water, a carpet cleaning solution, a hard floor cleaning solution and/or any other desired liquid to the floor or surface to be cleaned. Accordingly, prior to applying the liquid, the same surface cleaning apparatus may be used to vacuum the surface to help remove at least some of the solid debris before the liquid is applied. The liquid may then be applied and, as needed, allowed to remain on the surface for a pre-determined period of time, and the surface cleaning apparatus may then be used in its extractor mode to extract the liquid from the surface. If the apparatus is not configured to include an onboard liquid distribution system, liquid may be applied to the surface using a separate apparatus. In accordance with one broad aspect of the teachings describe herein, which may be used alone or in combination with any other aspects described herein, a surface cleaning apparatus may be provided with two treatment stages. The first treatment stage may be designed to remove liquid from an air stream (e.g., a momentum separator). The second treatment stage may be designed to remove solid particulate matter from the air stream (e.g., one or more cyclones in parallel). It will be appreciated that some solid particulate matter may be removed in the first treatment stage and that some liquid may be removed in the second treatment stage. In accordance with this aspect, the second or solid particulate matter treatment stage may be positioned above the first or liquid treatment stage. An advantage of this design is that the liquid treatment stage may be located at a lower elevation on the surface cleaning apparatus. Due to the volume of liquid an extractor is designed to remove, liquid requires substantially more energy to be drawn upwardly to a liquid treatment stage than entrained solid particulate matter. Accordingly, the energy requirement of a surface cleaning apparatus may be reduced by positioning the liquid treatment stage below the solid particulate matter treatment stage. Such a design is particularly advantageous if the surface treatment apparatus is an upright surface treatment apparatus wherein the treatment stages are provided on the upright section. A further advantage is that, if the treatment stages are at least partially or fully stacked on each other in a generally vertical arrangement, the overall foot print of the surface cleaning apparatus may be reduced. In accordance with this broad aspect, there is provided a surface cleaning apparatus comprising:
In any embodiment, the first stage liquid separator may include a momentum separator. In any embodiment, the suction motor may be positioned above the cyclone separator. In any embodiment, the liquid separator fluid outlet may be positioned at an upper end of the liquid separator and the cyclone chamber fluid outlet may be positioned at an upper end of the cyclone chamber and the suction motor inlet end may face towards the cyclone chamber fluid outlet. In any embodiment, the liquid separator fluid inlet may be provided in a lower surface of the liquid separator. In any embodiment, the second stage cyclone separator may include a dirt collection chamber exterior to the cyclone chamber and the cyclone chamber has a dirt outlet at an upper end of the cyclone chamber. In any embodiment, when the upright section is in the storage position, at least a portion of the dirt collection chamber may be positioned at a same elevation as a separated liquid reservoir (separated liquid container) of the liquid separator. In any embodiment, a fluid passage may extend from the liquid separator fluid outlet to the cyclone chamber fluid inlet, and at least a portion of the fluid passage that extends upwardly when the upright section is in the storage position may be located at the front side of the upright section. In accordance with this broad aspect, there is also provided a surface cleaning apparatus comprising:
In any embodiment, the first stage liquid separator may include a momentum separator. In any embodiment, the cyclone separator may be positioned above the first stage liquid separator and the suction motor is positioned above the cyclone separator. In any embodiment, the cyclone separator may be positioned above the first stage liquid separator and the liquid separator fluid outlet may be positioned at an upper end of the liquid separator. The cyclone chamber fluid outlet may be positioned at an upper end of the cyclone chamber and the suction motor inlet end may face towards the cyclone chamber fluid outlet. In any embodiment, the liquid separator fluid inlet may be provided in a lower surface of the liquid separator. In any embodiment, the second stage cyclone separator may include a dirt collection chamber exterior to the cyclone chamber and the cyclone chamber may have a dirt outlet at an upper end of the cyclone chamber. In any embodiment, when the upright section is in the storage position, at least a portion of the dirt collection chamber may be positioned at a same elevation as a separated liquid reservoir of the liquid separator. In any embodiment, the cyclone separator may be positioned above the first stage liquid separator. In any embodiment, the cyclone separator may be positioned overlying the first stage liquid separator. In any embodiment, the suction motor axis of rotation may intersect the first stage liquid separator and the second stage cyclone separator. In accordance with another broad aspect of the teachings describe herein, which may be used alone or in combination with any other aspects described herein, a liquid collection chamber for receiving liquid separated by the first treatment stage and a solid collection chamber for receiving solid particulate matter separated by the second treatment stage are emptyable concurrently. An advantage of this design is that it may facilitate emptying of the treatment unit (which comprises the first and second treatment stages). For example, the solid collection chamber and the liquid collection container may be simultaneously openable. Optionally, a cyclone chamber in the treatment unit may also be openable simultaneously with the solid collection chamber and the liquid collection container. In accordance with this aspect, there is provided a surface cleaning apparatus comprising:
In any embodiment, when the upright section is in the storage position, the solid collection chamber may be positioned at a same elevation as the liquid collection container. In any embodiment, the solid collection chamber may be positioned laterally beside the liquid collection container. In any embodiment, the solid collection chamber and the liquid collection container may be removable concurrently from the upright section. In any embodiment, the solid collection chamber and the liquid collection container may be removable from the upright section in a closed configuration. In any embodiment, the first stage liquid separator and the second stage cyclone separator may be removable concurrently from the upright section. In any embodiment, the solid collection chamber and the separated liquid container are of a unitary construction. In any embodiment, the solid collection chamber and the separated liquid collection container may be integrally formed. In any embodiment, the first stage liquid separator and the second stage cyclone separator may be removable in a sealed configuration other than the liquid separator fluid inlet and the cyclone chamber fluid outlet. In any embodiment, the solid collection chamber and the separated liquid collection container may have an openable top. In any embodiment, the openable top may include the cyclone chamber. In any embodiment, the solid collection chamber may be positioned laterally beside the separated liquid collection container and the cyclone chamber may have a cyclone axis of rotation that intersects the separated liquid collection container. In any embodiment, the solid collection chamber may be positioned laterally beside the liquid collection container and the cyclone chamber overlies the liquid collection container. In accordance with this aspect, there is also provided a surface cleaning apparatus comprising
In any embodiment, the solid collection chamber may be positioned laterally beside the liquid collection container. In any embodiment, the solid collection chamber and the separated liquid collection container may be removable concurrently from the surface cleaning apparatus. In any embodiment, the solid collection chamber and the separated liquid collection container may be removable from the surface cleaning apparatus in a closed configuration. In any embodiment, the first stage liquid separator and the second stage cyclone separator may be removable concurrently from the surface cleaning apparatus. In any embodiment, the first stage liquid separator and the second stage cyclone separator may be removable in a sealed configuration other than the separated liquid separator fluid inlet and the cyclone chamber fluid outlet. In any embodiment, the solid collection chamber and the separated liquid collection container may have an openable top and the openable top may include the cyclone chamber. In accordance with another broad aspect of the teachings describe herein, which may be used alone or in combination with any other aspects described herein, a surface cleaning apparatus has two or more different brushes (e.g., a hard floor cleaning brush and a carpet cleaning brush) and a liquid (e.g., water or a cleaning solution) may be applied to a selected brush. Further, a different liquid may be applied to each brush. For example, in a hard floor cleaning mode a liquid, which may be a hard floor cleaning solution, may be applied to the hard floor cleaning brush and in a carpet cleaning mode a liquid, which may be a carpet cleaning solution, may be applied to the carpet cleaning brush. In accordance with this aspect, there is provided a surface cleaning apparatus comprising:
In any embodiment, the at least one spray nozzle may include at least one first nozzle that delivers the liquid to the hard floor cleaning brush and at least one second nozzle that delivers the liquid to the carpet cleaning brush. In any embodiment, the liquid may include a hard floor cleaning solution and a carpet cleaning solution, wherein the at least one first nozzle delivers the hard floor cleaning solution to the hard floor cleaning brush and the at least one second nozzle delivers the carpet cleaning solution to the carpet cleaning brush. In any embodiment, the at least one first nozzle may be positioned to deliver the hard floor cleaning solution to the hard floor cleaning brush and the at least one second nozzle may be positioned to deliver the carpet cleaning solution to the carpet cleaning brush. In any embodiment, an actuator may be operably connected to the cleaning solution delivery system wherein, in a hard floor cleaning actuation mode, the at least one first nozzle delivers the liquid to the hard floor cleaning brush and in a carpet cleaning actuation mode, the at least one second nozzle delivers the liquid to the carpet cleaning brush. In any embodiment, the liquid may include a hard floor cleaning solution and a carpet cleaning solution wherein, in a hard floor cleaning actuation mode, the at least one first nozzle delivers the hard floor cleaning solution to the hard floor cleaning brush and in a carpet cleaning actuation mode, the at least one second nozzle delivers the carpet cleaning solution to the carpet cleaning brush. In any embodiment, in the hard floor cleaning actuation mode, the hard floor cleaning brush may be rotated and the carpet cleaning brush may be stationary, and in the carpet cleaning actuation mode, the hard floor cleaning brush may be stationary and the carpet cleaning brush may be rotated. In any embodiment, in both the hard floor cleaning actuation mode and the carpet cleaning actuation mode, both the hard floor cleaning brush and the carpet cleaning brush may be rotated. In any embodiment, the at least one spray nozzle may be moveably mounted whereby, in the hard floor cleaning configuration, the at least one spray nozzle is positioned to deliver the liquid to the soft brush bar, and in the carpet cleaning configuration, the at least one spray nozzle is positioned to deliver the liquid to the carpet cleaning brush. In any embodiment, the liquid may include a hard floor cleaning solution and a carpet cleaning solution and the at least one spray nozzle may be moveably mounted whereby, in the hard floor cleaning configuration, the at least one spray nozzle is positioned to deliver the hard floor cleaning solution to the soft brush bar, and in the carpet cleaning configuration, the at least one spray nozzle is positioned to deliver the carpet cleaning solution to the carpet cleaning brush. In any embodiment, an actuator may be operably connected to the cleaning solution delivery system wherein, in a hard floor cleaning actuation mode, the at least one nozzle may deliver the liquid to the hard floor cleaning brush and in a carpet cleaning actuation mode, the at least one nozzle may deliver the liquid to the carpet cleaning brush. In any embodiment, in the hard floor cleaning configuration the liquid may delivered at a first rate, and in the carpet cleaning configuration the liquid may be delivered at a second rate that is faster than the first rate. For example, in the hard floor cleaning configuration, the liquid may be delivered at a rate of 10-100 mL/min and in the carpet cleaning configuration, the liquid may be delivered at a rate of at least 100 mL/min. In any embodiment, in the hard floor cleaning configuration, the hard floor cleaning brush and the carpet cleaning brush may be rotated at a first rate of rotation and in the carpet cleaning configuration, the hard floor cleaning brush and the carpet cleaning brush may be rotated at a second rate of rotation that is faster than the first rate of rotation. For example, in the hard floor cleaning configuration, the hard floor cleaning brush and the carpet cleaning brush may be rotated at a rate of rotation of between about 1000-2400 RPM and in the carpet cleaning configuration, the hard floor cleaning brush and the carpet cleaning brush may be rotated at a rate of rotation of between about 2400-5000 RPM. In any embodiment, the liquid may include a hard floor cleaning solution and a carpet cleaning solution and the cleaning solution delivery system may include a hard floor cleaning solution reservoir and a carpet cleaning solution reservoir. In any embodiment, the liquid may include a hard floor cleaning solution and a carpet cleaning solution and the cleaning solution delivery system may include a clean water reservoir and a mixing system for selectively preparing carpet the hard floor cleaning solution and the carpet cleaning solution. In accordance with another broad aspect of the teachings describe herein, which may be used alone or in combination with any other aspects described herein a surface cleaning apparatus may have one or more liquid delivery system operable to alternately deliver different liquids (e.g., a carpet cleaning solution and a hard floor cleaning solution). Optionally, the liquid delivery system may have different conduits (which may be removable) for the different liquids which may be delivered (e.g., a water delivery line, a hard floor cleaning solution line and/or a carpet cleaning solution line). An advantage of this design is that different solutions may not be mixed. In accordance with this aspect, there is provided surface cleaning apparatus comprising:
In any embodiment, the actuator may be manually operated by a user. In any embodiment, the actuator may include a detector operable to determine a surface that is being cleaned. In any embodiment, the liquid delivery system may include a carpet cleaning solution reservoir and a hard floor cleaning solution reservoir. In any embodiment, the liquid delivery system may include a carpet cleaning solution delivery line extending from the carpet cleaning solution reservoir to the at least one delivery nozzle and a hard floor cleaning solution delivery line extending from the hard floor solution reservoir to the at least one delivery nozzle. In any embodiment, the at least one delivery nozzle may include at least one hard floor delivery nozzle and at least one carpet delivery nozzle. The carpet cleaning solution delivery line may extend from the carpet cleaning solution reservoir to the at least one carpet delivery nozzle and the hard floor cleaning solution delivery line may extend from the hard floor solution reservoir to the at least one hard floor delivery nozzle. In any embodiment, each of the carpet cleaning solution reservoir and the hard floor cleaning solution reservoir may be removable from the surface cleaning apparatus. In any embodiment, the carpet cleaning solution reservoir may be removable from the surface cleaning apparatus with the carpet cleaning solution delivery line and the hard floor cleaning solution reservoir may be removable from the surface cleaning apparatus with the hard floor cleaning solution delivery line. In any embodiment, the liquid delivery system may include a water reservoir, a hard floor cleaning concentrate container and a carpet cleaning concentrate container. In any embodiment, the liquid delivery system may include a mixer chamber, a carpet cleaning concentrate delivery line extending from the carpet cleaning concentrate container, a hard floor cleaning concentrate delivery line extending from the hard floor concentrate container and a water delivery line extending from the water reservoir. The carpet cleaning concentrate delivery line, the hard floor cleaning concentrate delivery line and the water delivery line may be in fluid communication with the mixer nozzle. In any embodiment, the carpet cleaning concentrate delivery line, the hard floor cleaning concentrate delivery line and the water delivery line may each extend to a position selected from an inlet end of the mixer chamber or a position adjacent the inlet end of the mixer chamber. In any embodiment, the mixer chamber may be upstream of the at least one delivery nozzle. In any embodiment, the at least one delivery nozzle may include the mixer chamber. In any embodiment, at least one pump may be operably coupled to an exterior of each of the carpet cleaning concentrate delivery line and the hard floor cleaning concentrate delivery line. The at least one pump may include a peristaltic pump. In any embodiment, the liquid delivery system may mix the hard floor cleaning concentrate with water at a first concentrate to water rate and may mix the carpet cleaning concentrate container with water at a second concentrate to water rate that differs to the first rate. In any embodiment, the cleaning solution delivery system may also be operable to deliver clean water to the at least one delivery nozzle. In accordance this broad aspect, there is also provided a surface cleaning apparatus comprising a liquid delivery system comprising a water reservoir, a first compartment for receiving a first cleaning solution concentrate, a mixer chamber, a first cleaning solution concentrate delivery line extending from the first compartment and a water delivery line extending from the water reservoir, wherein the first cleaning solution concentrate delivery line and the water delivery line are in fluid communication with the mixer nozzle In any embodiment, an actuator may be operably connected to the cleaning solution delivery system. In a first actuation mode, the cleaning solution delivery system may deliver a cleaning solution prepared from water and the first cleaning solution concentrate to at least one delivery nozzle and in a second actuation mode, the cleaning solution delivery system may deliver water to the at least one delivery nozzle. In any embodiment, a second compartment for receiving a second cleaning solution concentrate and a second cleaning solution concentrate delivery line may extend from the second compartment. The second cleaning solution concentrate delivery line may be in fluid communication with the mixer nozzle. In any embodiment, an actuator may be operably connected to the cleaning solution delivery system. In a hard floor cleaning actuation mode, the cleaning solution delivery system may deliver a hard floor cleaning solution prepared from water and the first cleaning solution concentrate to at least one delivery nozzle and, in a carpet cleaning actuation mode, the cleaning solution delivery system may deliver a carpet cleaning solution prepared from the water and the second cleaning solution concentrate to the at least one delivery nozzle. In any embodiment, the first compartment may be a refillable compartment. In any embodiment, the first compartment may removably receive a first cartridge containing the first cleaning solution concentrate. In any embodiment, the first cartridge may be removable with the first cleaning solution concentrate delivery line. In any embodiment, at least one pump may be operably coupled to an exterior of each of the first cleaning solution concentrate delivery line and water delivery line. The at least one pump may be a peristaltic pump. In accordance with this aspect, there is also provided a surface cleaning apparatus which may include a liquid delivery system having a first compartment for receiving a first cleaning solution, a first cleaning solution delivery line extending from the first compartment and at least one pump operably coupled to an exterior of the first cleaning solution delivery line. In any embodiment, the at least one pump may include a peristaltic pump. In any embodiment, the first compartment may removably receive a first cartridge containing the first cleaning solution. In any embodiment, the first cartridge may be removable with the first cleaning solution delivery line. In accordance with another broad aspect of the teachings describe herein, which may be used alone or in combination with any other aspects described herein a surface cleaning apparatus may have a solid and liquid separation stage including a combined solid and liquid separator and a collection chamber that receives both solids and liquids from the combined solid and liquid separator. The collection chamber may be subdivided by a water permeable member, such as a screen, so as to enable the separated liquid to be stored separate from the separated solid particulate matter. An advantage of this design is that a single reservoir may not have a build-up of sludge like material. In accordance with this aspect, there is provided a surface cleaning apparatus having a solid and liquid separation stage comprising:
In any embodiment, the combined solid and liquid separation member may include a cyclone having a cyclone wall, a cyclone fluid inlet and a cyclone fluid outlet and, when the surface cleaning apparatus is in the floor cleaning orientation, the separated element outlet may be at an upper end of the cyclone. In any embodiment, a baffle may be provided on an outer surface of the cyclone wall proximate the separated element outlet and may be located below the separated element outlet when the surface cleaning apparatus is in the floor cleaning orientation. In any embodiment, when the surface cleaning apparatus is in the floor cleaning orientation, the cyclone fluid inlet and the cyclone fluid outlet may be at a lower end of the cyclone. In any embodiment, when the surface cleaning apparatus is in the floor cleaning orientation, the lower region may extend to a position at a lower elevation than a lower end of the combined solid and liquid separation member. In any embodiment, the screen may be oriented such that a first direction of flow of liquid through the screen is at an angle to the first direction of flow through the separated element outlet. In any embodiment, the screen may be configured such that an additional direction of flow of liquid through the screen is at an angle to first direction of flow of liquid through the screen In any embodiment, the screen may generally L-shaped In any embodiment, the surface cleaning apparatus may include at least one additional screen. In any embodiment, when the surface cleaning apparatus is in the floor cleaning orientation, the solid and liquid collection chamber may have an upper end and the upper end is openable. In any embodiment, when the surface cleaning apparatus is in the floor cleaning orientation, the solid and liquid separation member may have an upper end and the upper end that is openable concurrently with the upper end of the solid and liquid collection chamber. In any embodiment, the surface cleaning apparatus may be an upright surface cleaning apparatus comprising a surface cleaning head and an upright section moveably mounted thereto between a storage position and a reclined surface cleaning position and the solid and liquid separation stage may be provided in the upright section. When the upright section is in the storage position, the separated element outlet may be provided at an upper end of the combined solid and liquid separation member, the lower region may extend to a position at a lower elevation than a lower end of the combined solid and liquid separation member and the solid and liquid collection chamber may have an upper end and the upper end is openable. In any embodiment, when the surface cleaning apparatus is in a floor cleaning orientation, the surface cleaning apparatus may have a drive handle located rearwardly on the surface cleaning apparatus and the separated element outlet is located on a rear side of the combined solid and liquid separation member. In accordance with this aspect, there is also provided a surface cleaning apparatus having a solid and liquid separation stage comprising:
In any embodiment, when the surface cleaning apparatus is in the floor cleaning orientation, the solid and liquid separation member has an upper end and the upper end may be openable concurrently with the upper end of the solid and liquid collection chamber. In any embodiment, the solid and liquid separation chamber further may include a screen provided therein and, when the surface cleaning apparatus is in the floor cleaning orientation, the solid and liquid collection chamber may have a lower region including a liquid collection region whereby, in operation, liquid passes through the screen and solid material collects on the screen. In any embodiment, a baffle may be provided on an outer surface of the separation member wall proximate the separated element outlet and may be located below the separated element outlet when the surface cleaning apparatus is in the floor cleaning orientation. In any embodiment, the combined solid and liquid separation member may include a cyclone having a cyclone fluid inlet and a cyclone fluid outlet. When the surface cleaning apparatus is in the floor cleaning orientation, the cyclone fluid inlet and the cyclone fluid outlet are at a lower end of the cyclone. In any embodiment, when the surface cleaning apparatus is in a floor cleaning orientation, the surface cleaning apparatus may have a drive handle located rearwardly on the surface cleaning apparatus and the separated element outlet may be located on a rear side of the combined solid and liquid separation member. In accordance with another aspect of the teachings describe herein, which may be used alone or in combination with any other aspects described herein, an upright surface cleaning apparatus may be configured as an upright surface cleaning apparatus with an above floor cleaning mode (e.g., a wand and a flexible hose may be removable for above floor cleaning) and/or a cleaning unit may be removably mounted to the upright apparatus with or without a wand and flexible hose. An advantage of these embodiments is that additional cleaning modes may be provided in a single apparatus. In such an embodiment, when used in an extractor mode or without the wand and hose deployed, the wand and hose may not be part of the fluid flow path through the apparatus. An advantage of this design is that the flow path is shorter in an extractor mode, thereby reducing the energy requirement and also reducing the water that may build up in the hose. In accordance with this aspect, there is provided an upright surface cleaning apparatus comprising:
In any embodiment, a valve may alternately connect the first dirty fluid inlet and the second dirty fluid inlet in flow communication with the first separator. In any embodiment, the floor cleaning fluid flow path may have a portion which extends from the first dirty fluid inlet to an outlet end that is upstream of the at least one cleaning stage and the above floor fluid flow path has a portion which extends from the second dirty fluid inlet to an outlet end that is upstream of the at least one cleaning stage and the outlet end of each of the floor cleaning and above floor fluid flow paths is located at an inlet portion of the valve. In any embodiment, a valve actuator may be drivingly connected to the valve and the above floor cleaning member may be drivingly connected to the valve actuator whereby the valve is moved to a floor cleaning position in which the at least one cleaning stage is in flow communication with the first dirty fluid inlet when an inlet end of the above floor cleaning member is mounted to the upright surface cleaning apparatus and the valve is moved to an above floor cleaning position in which the at least one cleaning stage is in flow communication with the second dirty fluid inlet when the inlet end of the above floor cleaning member is removed from the upright surface cleaning apparatus. In any embodiment, the upright section may include a portable surface cleaning unit which is removably mounted to the upright surface cleaning apparatus and the portable surface cleaning unit may include the at least one cleaning stage and the suction motor. In any embodiment, the portable surface cleaning unit may be removable without the at least one fluid reservoir. In any embodiment, the at least one fluid reservoir may be part of the surface cleaning head. In any embodiment, the at least one separation stage may include a second separation stage that is upstream from the first separation stage and the portable surface cleaning unit may be removable without the second separation stage. In any embodiment, the at least one separation stage may include a second separation stage that is upstream from the first separation stage and the portable surface cleaning unit may be removable without the second separation stage. In any embodiment, the second separation stage may be part of the surface cleaning head. In any embodiment, the second separation stage may include a liquid separator. In any embodiment, the flexible hose may be isolated from the floor cleaning fluid flow path. In accordance this aspect, there is also provided an upright surface cleaning apparatus comprising:
In any embodiment, the portable surface cleaning unit may be removable without the at least one fluid reservoir. In any embodiment, the at least one fluid reservoir may be part of the surface cleaning head. In any embodiment, the at least one separation stage may include a second separation stage that is upstream from the first separation stage and the portable surface cleaning unit may be removable without the second separation stage. In any embodiment, the at least one separation stage may include a second separation stage that is upstream from the first separation stage and the portable surface cleaning unit may be removable without the second separation stage. In any embodiment, the at least one separation stage may include a second separation stage that is upstream from the first separation stage and the second separation stage may be part of the surface cleaning head. In any embodiment, the second separation stage may include a liquid separator. In any embodiment, the flexible hose may be isolated from the floor cleaning fluid flow path. In accordance with another aspect of the teachings describe herein, which may be used alone or in combination with any other aspects described herein an upright surface cleaning apparatus having a surface cleaning apparatus which removes water from a surface is provided with a fluid flow path upstream from the separation stage (which may be any separation stage known in the art or disclosed herein) wherein at least a portion of the fluid flow path upstream from the separation stage is removable. An advantage of this design is that the removable portion may be removed and washed and/or dried to reduce the build-up of odors in the apparatus. In accordance with this aspect, there is provided a surface cleaning apparatus comprising:
In any embodiment, the removable portion may have an absence of a treatment member. In any embodiment, the removable portion may comprise a flexible hose. In any embodiment, the removable portion may comprise a plurality of individual segments. In any embodiment, at least one of the segments may be rigid. In any embodiment, one or more of the segments may be removable without removing all of the segments concurrently. In any embodiment, the removable portion may comprise a pivot joint. In any embodiment, the removable portion may extend through a pivot joint. In any embodiment, the removable portion may comprise at least a portion of the removable portion is transparent. In any embodiment, the surface cleaning apparatus may be an all in the head surface cleaning apparatus comprising a surface cleaning head and the removable portion is provided in the surface cleaning head. In any embodiment, the surface cleaning apparatus may be an upright surface cleaning apparatus having a surface cleaning head and an upright section moveably mounted to the surface cleaning head, the surface cleaning head including a moveable joint whereby the upright section is moveable between an upright storage position and a reclined surface cleaning position, the upright section comprising the separation stage and the removable portion comprises the moveable joint. In any embodiment, the surface cleaning apparatus may be an upright surface cleaning apparatus having a surface cleaning head and an upright section moveably mounted to the surface cleaning head, the surface cleaning head including a moveable joint whereby the upright section is moveable between an upright storage position and a reclined surface cleaning position, the upright section comprising the separation stage and the removable portion extends through the moveable joint. In any embodiment, the dirty fluid inlet may comprise a brush chamber and the removable portion extends from the brush chamber to the separation stage. In any embodiment, the separation stage may comprise a liquid separator. In any embodiment, the removable portion may be removable with the separation stage. In any embodiment, the separation stage may be removable as a sealed unit other than the fluid inlet and the fluid outlet. In any embodiment, the removable portion may be removable with the separation stage. In any embodiment, the surface cleaning apparatus may be an all in the head surface cleaning apparatus comprising a surface cleaning head and the removable portion is provided in the surface cleaning head. In accordance with another aspect of the teachings describe herein, which may be used alone or in combination with any other aspects described herein an upright surface cleaning apparatus having a surface cleaning apparatus has one or more of a liquid separator, a liquid collection container and a cleaning liquid reservoir in the surface cleaning head. An advantage of this design is that, in the case of an upright surface cleaning apparatus or an all in the head surface cleaning apparatus, the experienced handle weight (the weight of the handle experienced by a user when a cleaning solution or recovered dirty water is stored in the unit, is reduced by storing at least some of the liquid other than on the upright section. This may also help reduce the distance and elevation that liquid is conveyed within the fluid flow path of the apparatus, which may help reduce power requirements, and may lower the center of gravity of the apparatus when in use. In accordance with this aspect, there is provided an upright surface cleaning apparatus comprising:
In any embodiment, the cleaning liquid reservoir may be part of the surface cleaning head. In any embodiment, the cleaning solution delivery system may be part of the surface cleaning head. In any embodiment, the second stage solid separator may comprise a cyclone. In any embodiment, a portion of the fluid flow path located between the first dirty fluid inlet and the first stage liquid separator may be removable. Optionally, the portion of the fluid flow path and the first stage liquid separator may be concurrently removable. In any embodiment, the upright section may have a portable surface cleaning unit which is removably mounted to the upright surface cleaning apparatus, wherein the portable surface cleaning unit comprises the second stage solid separator, the suction motor and an above floor cleaning member, the above floor cleaning member comprising a second dirty fluid inlet and a flexible hose. Optionally the cleaning liquid reservoir may be part of the surface cleaning head. Alternately, or in addition, a portion of the fluid flow path located between the first dirty fluid inlet and the first stage liquid separator may be removable and the portion of the fluid flow path and the first stage liquid separator may be concurrently removable. In accordance with this aspect, there is also provided a surface cleaning apparatus comprising:
In any embodiment, the at least one separation stage may comprise a second separation stage that is downstream from the first separation stage. Optionally, the second separation stage may be part of the surface cleaning head. In any embodiment, the surface cleaning apparatus may be an all in the head surface cleaning apparatus. In any embodiment, the surface cleaning apparatus may be an upright surface cleaning apparatus having an upright section moveably mounted to the surface cleaning head, the upright section moveable between an upright storage position and a reclined surface cleaning position and the second separation stage is part of the upright section. In accordance with this aspect, there is also provide an upright surface cleaning apparatus comprising:
In any embodiment, both of the liquid collection container and the cleaning liquid reservoir may be part of the surface cleaning head. In any embodiment, the at least one separation stage may comprise a second separation stage that is downstream from the first separation stage and the second separation stage is part of the surface cleaning head. In any embodiment, the liquid collection container may be in flow communication with the first stage liquid separator and the first stage liquid separator is part of the upright section. In any embodiment, the liquid collection container may be part of the surface cleaning head. In accordance with another aspect of the teachings describe herein, which may be used alone or in combination with any other aspects described herein, an upright surface cleaning apparatus is provided with a cleaning head having two different types of rollers or brushes (e.g., a hard floor cleaning brush and a carpet cleaning brush). The hard floor cleaning brush may be positioned forward of the carpet cleaning brush. The two brushes may be rotatable at different speeds. An advantage of this design is that the cleaning head may be used to treat both hard floors and carpet. In accordance with this aspect, there is provided a surface cleaning head comprising:
In any embodiment, engagement of the front hard floor cleaning brush with the inner portion of the brush chamber may essentially inhibit air travelling upwardly over the brush into the brush chamber. In any embodiment, the front wall may extend to a position spaced between 0.25″ and 1.5″ above a hard surface floor when the surface cleaning head is positioned on the hard surface floor. In any embodiment, the front wall may extend to a position spaced between 0.5″ and 1.25″, and optionally 0.75″-1″, above a hard surface floor when the surface cleaning head is positioned on the hard surface floor. In any embodiment, the debriding member may extend forwardly and downwardly from an upper surface of the brush chamber. In any embodiment, the front hard floor cleaning brush may comprise microfibers. In any embodiment, the front hard floor cleaning brush may have an absence of self-supporting bristles. In any embodiment, the front hard floor cleaning brush may comprise a plurality of generally radially extending elastomeric paddles. In any embodiment, the carpet brush may comprise a plurality of spaced apart rows of bristles positioned circumferentially around the carpet brush wherein some of the rows of bristles have a lower stiffness compared to other rows of bristles that have a higher stiffness. In any embodiment, a row of bristles having the lower stiffness may be positioned between two circumferentially spaced apart rows of bristles having the higher stiffness. In any embodiment, the front rotatable brush may have a diameter that is from 75% to 125% of a diameter of the carpet brush and, optionally, the front rotatable brush and the carpet brush have approximately the same diameter. In any embodiment, the front rotatable brush and the carpet brush may have approximately the same diameter. In any embodiment, the front rotatable brush and the carpet brush may operate at different speeds. In any embodiment, the front rotatable brush may have a radially outer portion which travels at a speed which is from 75% to 125% a speed of the surface cleaning head when travelling over carpet. In any embodiment, the front rotatable brush may have a radially outer portion which travels at a speed which is proximate the speed of the surface cleaning head when travelling over carpet. In accordance with this aspect, there is also provided a surface cleaning head comprising:
In any embodiment, the front rotatable brush may have a radially outer portion which travels at a speed which is from 75% to 125% a speed of the surface cleaning head when travelling over carpet. In any embodiment, the front rotatable brush may have a radially outer portion which travels at a speed which is proximate the speed of the surface cleaning head when travelling over carpet. In any embodiment, the front rotatable brush may have a diameter that is from 0.75% to 1.25 percent of a diameter of the carpet brush. In any embodiment, the front rotatable brush and the carpet brush may have approximately the same diameter. In accordance with another aspect of the teachings describe herein, which may be used alone or in combination with any other aspects described herein an upright surface cleaning apparatus having a surface cleaning apparatus is provided with a cyclone having a liquid blocking collar (e.g., an annular ring), which inhibits and, optionally essentially prevents or prevents liquid separated from an air stream exiting the cyclone chamber via the cyclone air outlet of the cyclone chamber. An advantage of this design is that a single stage cyclone may be used to separate both liquid and particulate matter entrained in an air stream. In accordance with this aspect, there is provided a surface cleaning apparatus comprising:
In any embodiment, the inverted cyclone may have a cyclone sidewall and the separated element outlet is provided in a sidewall of the inverted cyclone. In any embodiment, the cyclone fluid inlet may have a height extending away from the lower end wall and the liquid blocking collar may be located above a mid-point of the height when the surface cleaning apparatus is in the floor cleaning orientation. In any embodiment, the surface cleaning apparatus may further comprise an outlet screen covering the inlet to the treated air outlet conduit. In any embodiment, the outlet screen may be frusto-conical in shape and the outlet screen may have a lower end that is wider than an upper end of the outlet screen when the surface cleaning apparatus is in the floor cleaning orientation. In any embodiment, the surface cleaning apparatus may further comprise an outlet conduit screen wherein the outlet conduit screen may be positioned around the treated air outlet conduit at a position below the liquid blocking collar when the surface cleaning apparatus is in the floor cleaning orientation. In any embodiment, the liquid blocking collar may extend a first lateral distance outward from the treated air outlet conduit and the outlet conduit screen may extend a second lateral distance outward from the treated air outlet conduit and the second lateral distance is less than the first lateral distance. In any embodiment, the cyclone fluid inlet may have a radial inner end and the outlet conduit screen may be spaced inwardly from the radial inner end whereby a gap is provided between the cyclone fluid inlet and the outlet conduit screen. In accordance with this aspect, there is also provided a surface cleaning apparatus comprising:
In any embodiment, the inverted cyclone may have a cyclone sidewall and the separated element outlet is provided in a sidewall of the inverted cyclone. In any embodiment, the cyclone fluid inlet may have a height extending away from the first end wall and the liquid blocking collar may be spaced further from the first end wall than a mid-point of the height of the cyclone fluid inlet. In any embodiment, the surface cleaning apparatus may further comprise an outlet screen covering the inlet to the treated air outlet conduit. In any embodiment, the outlet screen may be frusto-conical in shape and the outlet screen may have a first end that is positioned closer to the inlet of the treated air outlet conduit than a second end of the outlet screen and the first end of the outlet screen may be wider than a second end of the outlet screen. In any embodiment, the surface cleaning apparatus may further comprise an outlet conduit screen wherein the outlet conduit screen may be positioned around the treated air outlet conduit and extends between the first end wall and the liquid blocking collar. In any embodiment, the outlet conduit screen may be frusto-conical in shape and may have a first end that is positioned closer to the first end wall a second end of the outlet conduit screen and the first end of the outlet conduit screen may be wider than the second end of the outlet conduit screen. In any embodiment, the liquid blocking collar may extend a first lateral distance outward from the treated air outlet conduit and the outlet conduit screen may extend a second lateral distance outward from the treated air outlet conduit and the second lateral distance may be less than the first lateral distance. In any embodiment, the cyclone fluid inlet may have a radial inner end and the outlet conduit screen may be spaced inwardly from the radial inner end whereby a gap is provided between the cyclone fluid inlet and the outlet conduit screen. In any embodiment, the cyclone fluid inlet may have a radial inner end and the outlet conduit screen may be spaced inwardly from the radial inner end whereby a gap is provided between the cyclone fluid inlet and the outlet conduit screen. In accordance with another aspect of the teachings describe herein, which may be used alone or in combination with any other aspects described herein, recovered liquid may be transferred from a collection chamber to a separated liquid collection container which may be remote from the collection chamber. For example, the separated liquid collection container may be provided at a location spaced from the treatment unit, such as in a surface cleaning head of an upright surface cleaning apparatus. An advantage of this design is that, in the case of an upright surface cleaning apparatus or an all in the head surface cleaning apparatus, the experienced handle weight experienced by a user when a cleaning solution or recovered dirty water is stored in the unit is reduced by storing at least some of the liquid other than on the upright section. This may also help lower the center of gravity of the apparatus when in use. In accordance with this aspect, there is provided a surface cleaning apparatus comprising:
In any embodiment, when the surface cleaning apparatus is in the floor cleaning orientation, the separated liquid collection container may be positioned below the collection chamber. In any embodiment, separated liquid may pass to the separated liquid collection container by gravity flow. In any embodiment, the surface cleaning apparatus may further comprise a pump wherein the pump transfers separated fluid from the collection chamber to the separated liquid collection container. In any embodiment, the surface cleaning apparatus may further comprise a sensor which issues a signal when water is detected in the surface cleaning apparatus and the pump is actuated in response to the signal. In any embodiment, the pump may be actuated when the liquid delivery system is actuated and/or when the surface cleaning apparatus is actuated. In any embodiment, the collection chamber may comprise a screen positioned between an inlet to the fluid flow path and the separated element outlet. In any embodiment, the surface cleaning apparatus may further comprise a valve positioned to prevent fluid passing from the separated liquid collection container to the separated element outlet. The valve may be provided in the fluid flow path. In any embodiment, the separator may comprise a cyclone. In any embodiment, the surface cleaning apparatus may further comprise a surface cleaning head having a dirty fluid inlet and an upright section moveably mounted to the surface cleaning head, the upright section moveable between an upright storage position and a reclined surface cleaning position, the upright section comprising the separator and the surface cleaning head comprising the separated liquid collection container. Optionally, separated liquid passes to the separated liquid collection container by gravity flow. Alternately, or in addition, the surface cleaning apparatus may further comprise a pump wherein the pump transfers separated fluid from the collection chamber to the separated liquid collection container. In any embodiment, the separated liquid collection container may comprise an inflatable bladder. Optionally, the liquid delivery system may comprise a clean liquid container and the inflatable bladder may be provided in the clean liquid container. In any embodiment, the liquid delivery system may comprise a clean liquid container and the clean liquid container may comprise a deflatable bladder in the separated liquid collection container, wherein the clean liquid container deflates as clean liquid is withdrawn by the liquid delivery system. In any embodiment, the separated liquid collection container may be a disposable container. In accordance with another aspect of the teachings describe herein, which may be used alone or in combination with any other aspects described herein, an upright surface cleaning apparatus, which may be a hand held surface cleaning apparatus, is provided with a system to inhibit, essentially prevent or prevent water from exiting a liquid collection chamber and travelling to a suction motor. For example, if the surface cleaning apparatus is an upright surface cleaning apparatus, the surface cleaning apparatus may include a tilt or recline sensor which inhibits the upright section recline past a certain point when the surface cleaning apparatus is operated in an extractor mode and/or a sensor, such as a moisture sensor which issues a signal when water is detected in, e.g., a liquid collection chamber, the treatment unit or the flow path upstream of the suction motor. It will be appreciated that, surface cleaning apparatus, such as a hand held surface cleaning apparatus, may also incorporate a moisture sensor which issues a signal when water is detected in, e.g., a liquid collection chamber, the treatment unit or the flow path upstream of the suction motor. An advantage of this design is that the unit is inhibited from operating in a manner whereby water may be drawn into the suction motor. In accordance with this aspect, there is provided a an upright surface cleaning apparatus comprising:
In any embodiment, the recline limiter system may comprise a moisture sensor which issues a signal upon detecting water and a blocking member which, upon issuance of the signal, deploys to inhibit rearward inclination of the upright section further than a particular inclination. The particular rearward inclination of the upright section may be an angle of from 15 to 30° from the floor. In any embodiment, the auto shut off control system may comprise an inclination sensor which issues a signal upon detecting a particular rearward inclination of the upright section and a blocking member which, upon issuance of the signal, deploys to inhibit rearward inclination of the upright section further than a particular inclination. The particular rearward inclination of the upright section may be an angle of from 15 to 30° from the floor. In any embodiment, the upright surface cleaning apparatus may further comprise a cleaning solution delivery system comprising at least one spray nozzle that delivers at least one cleaning solution and the recline limiter system is actuated when the cleaning solution delivery system is actuated. In any embodiment, the recline limiter system may comprise a moisture sensor which issues a water detection signal upon detecting water and an inclination sensor which issues an inclination signal upon detecting a particular rearward inclination of the upright section and the recline limiter system deploys a blocking member that inhibits rearward inclination of the upright section further than a particular inclination upon issuance of the signals. In any embodiment, the upright surface cleaning apparatus may further comprise a solenoid which is actuated to deploy the blocking member upon issuance of the signals. In any embodiment, the separator may comprise an inverted cyclone comprising, when the surface cleaning apparatus is in a floor cleaning orientation, a lower end and an upper end, the lower end having a cyclone fluid inlet and a cyclone fluid outlet and the upper end has a separated element outlet in communication with the collection chamber. In accordance with this aspect, there is also provided a surface cleaning apparatus comprising:
In any embodiment, the auto shut off control system may comprise a moisture sensor which issues a signal upon detecting water and the auto shut off control system de-actuates the suction motor upon receipt of the signal. In any embodiment, the auto shut off control system may comprise an inclination sensor which issues a signal upon detecting a particular rearward inclination of the upright section and the auto shut off control system de-actuates the suction motor upon receipt of the signal. In any embodiment, the particular rearward inclination of the upright section may be an angle of from 15 to 30° from the floor. In any embodiment, the surface cleaning apparatus may further comprise a cleaning solution delivery system comprising at least one spray nozzle that delivers at least one cleaning solution and the auto shut off control system is actuated when the cleaning solution delivery system is actuated. In any embodiment, the auto shut off control system may comprise a moisture sensor which issues a water detection signal upon detecting water and an inclination sensor which issues an inclination signal upon detecting a particular rearward inclination of the upright section and the auto shut off control system de-actuates the suction motor when both signals are issued. In any embodiment, the separator may comprise an inverted cyclone comprising, when the surface cleaning apparatus is in a floor cleaning orientation, a lower end and an upper end, the lower end having a cyclone fluid inlet and a cyclone fluid outlet and the upper end has a separated element outlet in communication with the collection chamber. In any embodiment, the surface cleaning apparatus may further comprise a cleaning solution delivery system comprising at least one spray nozzle that delivers at least one cleaning solution and the auto shut off control system comprises an inclination sensor which issues a first inclination signal that inhibits the actuation of the suction motor until the upright section has been reclined beyond an initial angular degree of rotation of the upright section from the upright storage position. In any embodiment, the auto shut off control system may comprise a moisture sensor which issues a water detection signal upon detecting water and the inclination sensor issues a second inclination signal upon detecting a particular rearward inclination of the upright section and the auto shut off control system de-actuates the suction motor when both the water detection signal and the second inclination signals are issued. In any embodiment, the inclination sensor may comprise a single inclination sensor which issues both the first and second inclination signals. In any embodiment, the surface cleaning apparatus may be a hand held surface cleaning apparatus. In accordance with another aspect of the teachings describe herein, which may be used alone or in combination with any other aspects described herein, in order to inhibit, essentially prevent or prevent water from exiting a liquid collection chamber and travelling to a suction motor, a valve may be provided to close a flow path back into a separator, such as a cyclone. Alternately, or in addition the separated liquid container may be configured to provide a reservoir to store separated liquid when the orientation of a surface cleaning apparatus is changed from, e.g., a cleaning orientation to a horizontal orientation or a storage orientation to a reclined cleaning orientation. In accordance with this aspect, there is provided a surface cleaning apparatus comprising:
In any embodiment, the separation stage may further comprise a solid collection chamber and the first portion underlies the solid collection chamber, the second portion is laterally spaced from the first portion and is positioned below the solid collection chamber and the third portion is positioned above the second portion, and the third portion has a volume that is at least 80% of a volume of the first portion. In any embodiment, the third portion may be positioned adjacent the solid collection chamber. In any embodiment, the third portion may extend along a side of the solid collection chamber. In any embodiment, the third portion may be in flow communication with the solid collection chamber and the second portion is in flow communication with the third portion. In any embodiment, the first and second portions may comprise a contiguous volume. In any embodiment, the separator may comprise an inverted cyclone comprising, when the surface cleaning apparatus is in a floor cleaning orientation, a lower end and an upper end, the lower end having a cyclone fluid inlet and a cyclone fluid outlet and the upper end has the separated element outlet, wherein the third portion has a volume whereby, when the surface cleaning apparatus is in a vertical orientation, the first and second portions are full with separated liquid and the third portion is empty and when the surface cleaning apparatus is then moved to a horizontal orientation, an upper surface of the separated liquid is positioned below the separated element outlet. In any embodiment, the surface cleaning apparatus may be an upright surface cleaning apparatus comprising:
In any embodiment, the surface cleaning apparatus may further comprise a valve in a flow connection between the third portion and the solid collection chamber. In accordance with this aspect, there is also provided a surface cleaning apparatus comprising:
In any embodiment, the separation stage may further comprise a solid collection chamber and the first portion underlies the solid collection chamber, the second portion is laterally spaced from the first portion and is positioned below the solid collection chamber and the third portion is positioned above the second portion, and the third portion has a volume that is at least 80% of a volume of the first portion. In any embodiment, the third portion may be positioned adjacent the solid collection chamber. In any embodiment, the third portion may extend alone a side of the solid collection chamber. In any embodiment, the third portion may be in flow communication with the solid collection chamber and the second portion is in flow communication with the third portion. In any embodiment, the first and second portions may comprise a contiguous volume. In any embodiment, the separator may comprise an inverted cyclone comprising, when the surface cleaning apparatus is in a floor cleaning orientation, a lower end and an upper end, the lower end having a cyclone fluid inlet and a cyclone fluid outlet and the upper end has the separated element outlet. In any embodiment, the surface cleaning apparatus may be an upright surface cleaning apparatus comprising:
In any embodiment, the surface cleaning apparatus may further comprise a valve in a flow connection between the third portion and the solid collection chamber. In accordance with this aspect, there is also provided a surface cleaning apparatus comprising:
In any embodiment, the separated liquid container may have a first portion underlying the solid collection chamber, a second portion laterally spaced from the first portion and positioned below the solid collection chamber and a third portion positioned above the second portion and adjacent the solid collection chamber and the third portion is in flow communication with the solid collection chamber. In any embodiment, the third portion may have a volume that is at least 80% of a volume of the first portion In any embodiment, the separator may comprise an inverted cyclone comprising, when the surface cleaning apparatus is in a floor cleaning orientation, a lower end and an upper end, the lower end having a cyclone fluid inlet and a cyclone fluid outlet and the upper end has the separated element outlet. In accordance with another aspect of the teachings describe herein, which may be used alone or in combination with any other aspects described herein, an upright surface cleaning apparatus may be a hand held surface cleaning apparatus. The hand held cleaning apparatus may use any of the embodiments of the various aspects disclosed herein which are not limited to designs of an upright or all in the head surface cleaning apparatus. In accordance with this aspect, there is provided a hand held surface cleaning apparatus comprising:
In any embodiment, the suction motor may be positioned rearward of the separator. In any embodiment, the separated liquid reservoir may be positioned at the front end. In any embodiment, the handle may be provided at a rear end of the hand held surface cleaning apparatus. In any embodiment, a plane may intersect the separated liquid reservoir, the solid collection chamber and the separator. In any embodiment, the fluid flow path may include an inlet passage that extends from the dirty fluid inlet to an inlet to the separator and a portion of the inlet passage extends through the separated liquid reservoir. In any embodiment, the fluid flow path may include a downstream portion extending from a separator outlet to the suction motor and the suction motor has an axis of rotation that is generally parallel to the flow axis of the downstream portion. In any embodiment, the flow axis of the downstream portion may be generally parallel to a flow axis of the inlet passage. In any embodiment, the separator may comprise an inverted cyclone comprising, when the surface cleaning apparatus is in a floor cleaning orientation, a lower end and an upper end, the lower end having a cyclone fluid inlet and a cyclone fluid outlet and the upper end having the separated element outlet. In any embodiment, the fluid flow path may include an inlet passage that extends from the dirty fluid inlet to an inlet to the cyclone and the cyclone has an axis of rotation that is generally perpendicular to a flow axis of the inlet passage. In any embodiment, the hand held surface cleaning apparatus may further comprise an on board power source wherein the on board power source is positioned rearward of the separator. In any embodiment, the hand held surface cleaning apparatus may further comprise an on board power source wherein the on board power source is positioned rearward of the suction motor. In any embodiment, the fluid flow path may include an inlet passage that extends from the dirty fluid inlet to an inlet to the separator and the hand held surface cleaning apparatus may further comprise an on board power source wherein at least a portion of the on board power source is positioned above of the suction motor when a flow axis of the inlet passage extends generally horizontally. In any embodiment, the hand held surface cleaning apparatus may further comprise a cleaning solution delivery system comprising at least one spray nozzle that delivers at least one cleaning solution. In any embodiment, the handle may extend from the separator to a position rearward of an inlet end of the suction motor. In any embodiment, the handle may extend from the separator to a position adjacent a rear end of the suction motor. In any embodiment, the fluid flow path may include an inlet passage that extends from the dirty fluid inlet to an inlet to the separator and when a flow axis of the inlet passage extends generally horizontally, all operating components of the hand held surface cleaning apparatus are positioned below the separated element outlet. In accordance with another aspect of the teachings describe herein, which may be used alone or in combination with any other aspects described herein, an upright surface cleaning apparatus may include an open cell material, such as a sponge, which may be positioned between an entrance to a separated liquid reservoir and a portion of the separated liquid reservoir which retains separated liquid. An advantage of this design is that stored separated liquid may be inhibited from reversing direction and travelling from a liquid reservoir to a separator (e.g., cyclone) and then to the suction motor. In accordance with this aspect, there is provided a surface cleaning apparatus comprising:
In any embodiment, the liquid sequestering member may comprise an open cell material. The open cell material may comprise an open cell foam. In any embodiment, the liquid sequestering member may be deformable and reusable. In any embodiment, the separated liquid reservoir may comprise a container with an openable lid wherein the liquid sequestering member remains in the container when the lid is opened. In any embodiment, the surface cleaning apparatus may further comprise a compression member which is moveable between a first position in which the liquid sequestering member is uncompressed and a second position in which the liquid sequestering member is deformed. The compression member may comprise a plunger. In any embodiment, the separated liquid reservoir may have a liquid outlet positioned below the compression member when the separated liquid reservoir is positioned in an emptying orientation, whereby, when the liquid outlet is opened and the liquid sequestering member is compressed, liquid trapped in the liquid sequestering member exits the separated liquid reservoir through the liquid outlet while the liquid sequestering member remains in the separated liquid reservoir. In any embodiment, the separated liquid reservoir may have a separated liquid outlet, the liquid sequestering member may be deformable and reusable, and the surface cleaning apparatus may further comprise a compression member which is moveable between a first position in which the liquid sequestering member is uncompressed and a second position in which the liquid sequestering member is deformed. In accordance with this aspect, there is also provided a surface cleaning apparatus comprising:
In any embodiment, the baffle members may comprise an open cell material. In any embodiment, the baffle members may comprise an open cell foam. In any embodiment, the baffle members may be deformable. In any embodiment, the separated liquid reservoir may comprise a container with an openable lid wherein the baffle members remain in the container when the lid is opened. In any embodiment, the surface cleaning apparatus may further comprise a compression member which is moveable between a first position in which the baffle members are uncompressed and a second position in which the baffle members are deformed. The compression member may comprise a plunger. In any embodiment, the separated liquid reservoir may have a liquid outlet positioned below the compression member when the separated liquid reservoir is positioned in an emptying orientation, whereby, when the liquid outlet is opened and the open cell material is compressed, liquid trapped in the open cell material exits the separated liquid reservoir through the liquid outlet while the open cell material remains in the separated liquid reservoir. In any embodiment, the separated liquid reservoir may have a separated liquid outlet, the baffle members are deformable, and the surface cleaning apparatus further comprises a compression member which is moveable between a first position in which the baffle members are uncompressed and a second position in which the baffle members are deformed. The drawings included herewith are for illustrating various examples of articles, methods, and apparatuses of the teaching of the present specification and are not intended to limit the scope of what is taught in any way. In the drawings: Various apparatuses or processes will be described below to provide an example of an embodiment of each claimed invention. No embodiment described below limits any claimed invention and any claimed invention may cover processes or apparatuses that differ from those described below. The claimed inventions are not limited to apparatuses or processes having all of the features of any one apparatus or process described below or to features common to multiple or all of the apparatuses described below. It is possible that an apparatus or process described below is not an embodiment of any claimed invention. Any invention disclosed in an apparatus or process described below that is not claimed in this document may be the subject matter of another protective instrument, for example, a continuing patent application, and the applicants, inventors or owners do not intend to abandon, disclaim or dedicate to the public any such invention by its disclosure in this document. The terms “an embodiment,” “embodiment,” “embodiments,” “the embodiment,” “the embodiments,” “one or more embodiments,” “some embodiments,” and “one embodiment” mean “one or more (but not all) embodiments of the present invention(s),” unless expressly specified otherwise. The terms “including,” “comprising” and variations thereof mean “including but not limited to,” unless expressly specified otherwise. A listing of items does not imply that any or all of the items are mutually exclusive, unless expressly specified otherwise. The terms “a,” “an” and “the” mean “one or more,” unless expressly specified otherwise. As used herein and in the claims, two or more parts are said to be “coupled”, “connected”, “attached”, or “fastened” where the parts are joined or operate together either directly or indirectly (i.e., through one or more intermediate parts), so long as a link occurs. As used herein and in the claims, two or more parts are said to be “directly coupled”, “directly connected”, “directly attached”, or “directly fastened” where the parts are connected in physical contact with each other. As used herein, two or more parts are said to be “rigidly coupled”, “rigidly connected”, “rigidly attached”, or “rigidly fastened” where the parts are coupled so as to move as one while maintaining a constant orientation relative to each other. None of the terms “coupled”, “connected”, “attached”, and “fastened” distinguish the manner in which two or more parts are joined together. Referring to In the embodiment shown, the surface cleaning apparatus is an upright surface cleaning apparatus that can be operated in a vacuum cleaner mode and optionally in an extractor mode. In alternate embodiments, the surface cleaning apparatus may be another suitable type of surface cleaning apparatus, such as a canister type vacuum cleaner, and hand vacuum cleaner, a stick vacuum cleaner or a carpet extractor. In the illustrated example, the surface cleaning apparatus 100 includes a surface cleaning head 102 that is configured to travel (e.g., roll) across a surface to be cleaned, such as a floor. The surface cleaning head 102 includes at least one dirty fluid inlet 104, which may be positioned proximate the floor when the surface cleaning head 102 is in the surface cleaning position. The dirty fluid inlet 104 may be configured to receive relatively dry air, dirt, debris and the like, as would any vacuum cleaner. Dirty fluid inlet 104 may optionally be configured to receive liquids, such as water, cleaning solutions and other liquids that may be on the surface, as would any extractor. It will be appreciated that two different dirty fluid inlets 104 may be provided, one for each function. For example, the surface cleaning head 102 may include a dirty air inlet, configured to receive air and solid debris entrained within the air, and a separate dirty liquid inlet, configured to receive liquids. The dirty air inlet and dirty liquid inlet, and any other inlets, may be spaced apart from each other, or optionally may be at least partially nested within each other. For example, the dirty air inlet may be positioned forward of the dirty liquid inlet, in a direction of travel of the apparatus 100—indicated by arrow 106 in Alternately, a single dirty fluid inlet 104 may be configured to receive both relatively dry and relatively wet materials. For example, a single dirty fluid inlet may be reconfigurable (e.g., by reducing the cross-sectional area of part of the flow path through a nozzle in a direction transverse to a direction of air flow therethrough) to have increased air flow at the inlet when used to draw in relatively wet materials (e.g., when operated in an extractor mode). Except as required by an embodiment using a particular feature disclosed herein, the surface cleaning head 102 may be of any suitable design (including any of those described herein), and may include a variety of features, such as rotating brushes, static brushes, squeegees, liquid application nozzles or sprayers, treatment units, motors, lights and the like. Referring also to Optionally, the upright section 116 may also be steeringly connected to the surface cleaning head 102. For example the upright section 116 may be movable in at least one other degree of freedom relative to the surface cleaning head 102 to help facilitate steering of the surface cleaning head 102. For example, the upright section 116 may be rotatably connected to the support member 112 so that it can rotate about its longitudinal axis 118 relative to the surface cleaning head 102. Alternatively, or in addition, the upright section 116 may be pivotable about a different, second (e.g., a forwardly extending horizontal) pivot axis relative to the surface cleaning head 102. A drive handle 386 may be provided on the upright section 116, optionally toward its upper end, and a user may grasp the drive handle 386 to maneuver and/or steer the surface cleaning apparatus 100 across a surface. As exemplified, the upright section 116 may include a cleaning unit 120 (which as exemplified in At least one suction motor, provided in a motor housing, and at least one fluid treatment unit are provided in the fluid flow path to separate dirt, debris, and/or liquids from the fluid traveling through the apparatus 100. In the illustrated example, the suction motor, motor housing and the treatment unit are both provided in the cleaning unit 120. The fluid treatment unit may include any suitable treatment apparatuses, including one or more momentum separators, one or more cyclonic separators, one or more filters, bags and the like. Preferably, at least one treatment apparatus is provided in the fluid flow path upstream from the suction motor. Upright Embodiment with Stacked Configuration In accordance with one aspect of the teachings described herein, which may be used in combination with any other aspects described herein, an exemplary embodiment of a surface cleaning apparatus 100 may be configured as a generally, upright-style cleaning apparatus and may be arranged so that at least some of its operating components are generally vertically stacked on top of each other. Optionally, the surface cleaning apparatus may also be configured so that at least a portion of the fluid passage extending between its first stage liquid separator and its second stage cyclone separator is located toward the front side of the upright section. In accordance with this aspect, two or more, and optionally three or more, operational components of the apparatus are vertically stacked, and optionally vertically aligned, in the upright section 116. The operating components may be one or more separators, and optionally two or more separators (e.g., a liquid separator and a downstream dry separator), and a suction motor. An advantage of stacking the components is that it may help reduce the overall size of the cleaning unit 120. It may also help simplify the fluid flow path within the cleaning unit 120, which may help reduce backpressure in the fluid flow path or otherwise help improve the efficiency of the cleaning unit 120. Further, this will enable a liquid separator to be provided at a lower elevation and reduce the energy required during operation of the apparatus as the water need not be raised to atop of the upright surface cleaning apparatus. As exemplified in As exemplified in In this embodiment, the surface cleaning apparatus 100 includes a surface cleaning head 102 (having a front end 350 including the dirty fluid inlet 104) and the upright section 116 is moveably mounted to the surface cleaning head 102, between an upright storage position ( As exemplified, the first stage liquid separator 132 is positioned such that the outlet of the first stage liquid separator 132 is below the inlet of the second stage separator 134. It will be appreciated that the first stage liquid separator 132 may be below, and may underlie, the second stage separator 134. Accordingly, in accordance with this aspect, at least a portion of a fluid passage 149 that fluidly connects the liquid separator fluid outlet 150 to the cyclone chamber fluid inlet 152 may extend generally upwardly when the upright section 116 is in the storage position ( In the embodiment of Optionally, each of the first and second stage separators 132, 134 may include a single separating apparatus (e.g. a single cyclone chamber, a single liquid separator such as a momentum separator) and/or two or more separating apparatuses arranged in parallel with each other (e.g. two or more cyclone chambers arranged in parallel). Alternatively, instead of having two separating stages, the treatment unit 130 may include only a single stage separator (with one or more separating apparatuses) or three or more separating stages in series with each other. In the embodiment of In the embodiment of In this embodiment, and in several other embodiments described herein, the second stage separator 134 (e.g. the cyclone separator) overlies at least a portion of, and optionally all of, the first stage liquid separator 132 (e.g. the momentum separator 140 as illustrated). This may help reduce the overall lateral size of the cleaning unit 120. It will be appreciated that, in an alternate embodiment (such as shown in As exemplified, a pre-motor filter 160 may positioned in the fluid flow path (optionally within a pre-motor filter housing or pre-motor chamber 161), between the treatment unit 130 and the suction motor 124, to further filter air exiting the treatment unit 130 before it enters the suction motor 124. The pre-motor filter 160 may be any suitable filter member, including one or more layers of porous media filters (such as foam, felt and the like). An optional post-motor filter (not shown) may alternately or in addition be provided in the fluid flow path, between the suction motor 124 and the clean air outlet 138 of the apparatus 100 (see also In this example, suction motor housing 126 is positioned above the first stage separator 132 and below the second stage separator 134. This may help reduce the overall front/back and/or side to side width of the cleaning unit 120, for example as compared to a configuration in which the suction motor housing is positioned forward, rearward or laterally beside the treatment unit 130 or portions thereof. In the illustrated arrangement, the suction motor 124 is oriented vertically, such that the motor axis 128 is substantially parallel to the cyclone axis 154, and to the direction the dirty fluid flow is travelling as it enters the momentum separator 140 (illustrated by axis 163 in Preferably, if the treatment unit 130 is configured to include a liquid separator, such as the momentum separator 140, the liquid separator may be provided toward the lower end of the treatment unit 130 and/or cleaning unit 120. As liquid is relatively heavy, as compared to air, positioning any liquid separators relatively low in the apparatus 100 may help lower the centre of gravity of the cleaning unit 120 and/or apparatus 100. This may help reduce help improve the hand feel of the apparatus 100 when in use, and may help reduce the amount of lifting and/or rotational forces exerted on the user's hand/wrist when pushing and steering the apparatus. Positioning any liquid separators relatively low in the apparatus 100 may also reduce the distance/elevation that water and other liquids will travel from the surface cleaning head 102 to the liquid separator. Reducing the elevation that the liquids travel within the fluid flow path may help reduce the amount of energy required to motivate the dirty fluid flow. The dirty fluid that has had its liquids substantially removed can then continue to travel further upwardly within the apparatus 100, such as to the second stage separator 134 provided toward the top of the cleaning unit 120. Positioning liquid separators toward the bottom of the cleaning unit 120 may also help reduce the likelihood that liquids other operating components of the apparatus 100 will come in to contact with the liquid, such as, for example if liquid happens to leak from the liquid collection container 148. In the embodiment illustrated in In the embodiment of Referring to When the upright section 116 is reclined in the surface cleaning position, liquid that is contained in the liquid collection container 148 may tend to collect along the rear portion of the first separator 132, as the rear portion will tend to be at a lower elevation than the front portion of the first separator 132. In the embodiment of As exemplified in As exemplified in In the embodiment of Optionally, some embodiments of the surface cleaning apparatus 100 (including those shown in Optionally, the cleaning unit 120 may be configured so that at least a portion of the solid collection chamber of the second separator stage is positioned at about the same elevation as the separated liquid reservoir of the first separation unit. This may help reduce the overall size of the cleaning unit 120. Referring also to It will be appreciated that a stacked configuration as disclosed herein may also be used for, e.g., a canister style apparatus or a hand help apparatus. Momentum Separator with Two Inlets In accordance with one aspect of the teachings described herein, which may be used in combination with any other aspects described herein, a momentum separator may have one or more side wall inlets. As exemplified in In this embodiment, two, separate dirty fluid inlets 146 are provided in a front wall 416 of the separator 140 to receive incoming dirty fluid flows. If the momentum separator 140 is provided in a surface cleaning head 102, each dirty fluid inlet 146 may be in fluid communication with the brush chamber (such as brush chamber 354 described herein) and dirty fluid inlet 104. Extending inwardly from each dirty fluid inlet 146 is a respective inlet conduit 180, extending along generally forward/rearwardly extending conduit axes 184, that helps direct the incoming fluid flow in the generally rearward direction as it enters the momentum separator 140. When travelling rearwardly, at least some of the incoming dirty fluid, and liquid entrained therein, may impact an internal wall portion 186 which may help separate the liquid from the air flow. As exemplified, the internal wall portions 186 may be integrally formed with the rear wall 418, instead of being provided as a separate member projecting downwardly from the lid. In other embodiments, the lid for this momentum separator may include downwardly depending members that provide the internal walls 186 to be engaged by the incoming fluid. Liquid that is separated from the dirty fluid flow can then fall downwardly into, and be retained in, the liquid collection container 148 and the relatively drier air flow can continue out via the liquid separator fluid outlet 150 and travel downstream to a suitable second separator 134 (such as a cyclone chamber 142). Optionally, a liquid porous divider, such as an embodiment of a screen 298 can be provided within the liquid collection container 148, and may sub-divide the liquid collection container 148 into a lower portion (below/downstream from the screen 298) and an upper portion 148 In accordance with one aspect of the teachings described herein, which may be used in combination with any other aspects described herein, dual stage treatment units may be configured so that a solid collection region (e.g., the solid collection chamber 144) and the liquid collection reservoir or region (e.g., liquid collection container 148) may be openable and/or may be emptied concurrently. In some embodiments, the solid collection chamber and the liquid collection reservoir may be openable via a single operation. This may help facilitate emptying of the two stage treatment unit. As exemplified, the momentum separator 140 is configured so that separator fluid inlet 146 includes an upstream end 176 provided in a lower wall 178, and an inlet conduit 180 that extends upwardly along an inlet conduit axis 184, from the upstream end 176 to a downstream end 182. The momentum separator 140 also optionally includes at least one baffle or deflecting member that is position adjacent the downstream end 182 of the separator fluid inlet 146. In this example, the deflecting member includes a portion of the upper end wall 188 of the momentum separator that overlies that downstream end 182, as well as an internal wall 186 that depends inwardly from the upper end wall 188 of the momentum separator 140. The deflecting member is preferably positioned such that an incoming stream of dirty fluid will impact the deflecting member, i.e., will contact the upper end wall 188 and internal wall 186, upon entering the momentum separator 140. This may help cause the dirty fluid stream to change direction relatively quickly, which may tend to help separate liquids from the fluid flow. To exit the momentum separator 140, in the illustrated embodiment, the fluid can travel through the momentum separator fluid outlet 150 which is, in this configuration, provided in the upper end wall 188 and preferably at the front side if the momentum separator is provided on an upper section. The separated liquids, and any other solids and debris, may tend to collect in the liquid collection container 148, while the remaining portion of the incoming dirty fluid flow can continue downstream to the second separator 134. From the momentum separator fluid outlet 150, the dirty fluid can flow into the cyclone chamber 142 via the cyclone air inlet 152. Debris separated from the air flow via the cyclonic swirling (about cyclone axis 154) can travel through the cyclone separated element outlet 156 and fall into the solid collection chamber 144. In the illustrated example, the solid collection chamber 144 is external the cyclone chamber 142 and is positioned generally beside, and at least partially surrounding the momentum separator 140. This may help reduce the overall size of the treatment unit 130 and facilitate the concurrent emptying of the collection regions. For example, referring to As exemplified in In this configuration, the cyclone chamber 142 forms part of an openable lid 194 of the momentum separator 140, wherein a lower cyclone end wall 190 and the upper end wall 188 of the momentum separator 140 are part of a common lid structure 194. This lid 194 also includes the momentum separator fluid outlet 150 and the cyclone separated element outlet 156, as well as the internal wall 186. When the cyclone chamber 142 is removed, the liquid collection container 148 and the solid collection chamber 144 are simultaneously opened for emptying, maintenance and the like and are emptyable concurrently. In this configuration, both the solid collection chamber 144 and the separated liquid collection container 148 have an openable top, but in other embodiments may have openable bottoms, sidewalls and the like. In the illustrated example, the cyclone chamber 142 overlies the liquid collection container 148 portion of the momentum separator 140, and is laterally offset from (i.e. does not overlie) the solid collection chamber 144, such that the momentum separator is at least partially nested beneath the cyclone chamber 142 and beside the solid collection chamber 144. In other embodiments, at least a portion of the solid collection chamber 144 can extend beneath the cyclone chamber 142, such that the cyclone chamber 142 overlies at least a portion of the solid collection chamber 144 and the momentum separator 140. In this embodiment, the top of the liquid collection container 148 is configured to have an openable lid 194 for emptying. Alternatively, other portions of the liquid collection container 148 may be openable, including, for example, the lower wall 178, and/or an openable port or drain opening may be provide in one of the walls instead of having an openable wall. Providing an openable lid 194 may be preferable in some instances, as it may help reduce the likelihood of leaks developing around the perimeter of an openable lower wall 178. In this embodiment, the openable top of the liquid collection container 148 includes the cyclone chamber 142. In this embodiment, the solid collection chamber 144 is positioned laterally beside the liquid collection container 148 and the cyclone chamber 142 is positioned above and overlies the liquid collection container 148 (and optionally, as shown, my not overlie the solid collection chamber 144). In this arrangement, the cyclone axis of rotation 154 intersects the liquid collection container 148, but does not intersect the solid collection chamber 144. Optionally, the liquid collection container 148 and the solid collection chamber 144 can be at least partially formed from integral, one-piece construction, in which the lower wall 178 is integrally formed with a bottom wall 196 of the solid collection chamber 144, and the two collection regions 148 and 144 are bounded by a common, integrally formed sidewall portion 198 ( In accordance with the exemplified embodiment, removing the cyclone chamber opens the upper end of the two collection regions 148 and 144, thereby permitting both collection regions to be emptied concurrently. Alternately, each collection region may have its one lid or openable upper end, which would still permit the two collection regions 148 and 144 to be emptied concurrently. It will be appreciated that the two collection regions 148 and 144 may be remote from the separators but may still be emptied concurrently. Optionally, the treatment unit 130 may be removable from the cleaning unit 120 (or wherever it is mounted to the apparatus 100) as a single, generally sealed unit. This may help simplifying the emptying process and/or may help reduce the likelihood of the contents of the liquid collection container 148 and solid collection chamber 144 from spilling. For example, in the illustrated embodiment, the treatment unit 130 may be separated from the surface cleaning apparatus 100 while in its closed configuration (other than fluid inlet and outlet conduits). In this arrangement, the treatment unit 130 is substantially sealed, but for the momentum separator fluid inlet 146 and the cyclone chamber air outlet 158. This can allow the liquid collection container 148, solid collection chamber 144 and cyclone chamber 142 remain generally sealed while the treatment unit 130 is removed and transported to a sink, garbage can or the like for emptying. In this arrangement, the solid collection chamber 144 and liquid collection container 148 are removable in their closed configuration. Alternatively, instead of being configured to open simultaneously, the liquid collection container 148 and the solid collection chamber 144 may be separately openable. For example, the liquid collection container 148 may have an independently openable lid, and may be emptied (e.g. poured into a sink or drain) without also dumping the dry dirt and debris from the solid collection chamber 144 at the same time—or vice versa. This may help prevent unwanted mixing of wet and dry debris when emptying the treatment unit 130. Single Stage Separator with a Liquid Blocking Member The following is a description of one example of a treatment unit that is configured to separate liquid and solid debris from an incoming dirty fluid flow using a single treatment stage, such as a cyclonic separation apparatus. This treatment unit may be suitable for use with the surface cleaning apparatuses described herein, for example as an alternative to the dual stage cleaning units. Referring to Debris that is separated from the fluid flow can exit the cyclone chamber 142 via a separated element outlet 156, that is analogous to the separated element outlet 156 described in relation to a “dry” cyclone separator, but that is also configured to convey separated liquid (e.g. water) and other wet debris. The separated debris is then collected in a combined solid and liquid collection container which, in this example, functions as both a solid collection chamber 144 and the liquid collection container 148 described herein. A single stage treatment unit 130 having some or all of the features of the embodiments shown in In the illustrated embodiment, the cyclone chamber air outlet 158 includes an axially extending outlet conduit 240, also referred to as a vortex finder, extending between an inner, inlet end 242 and an outlet end 244. A relatively coarse mesh or screen 246 may be provided to cover the inlet end 242 of the conduit 240, which may help prevent hair, fluff and other debris from exiting the cyclone chamber 142 via the cyclone chamber air outlet 158. The treatment unit 130 of Preferably, the solid collection chamber 144 and liquid collection container 148 (which in Optionally, as exemplified in Referring to As exemplified, the blocking collar 248 is, in this example, a generally annular, ring-like member having an inner end 250 abutting or attached to the outlet conduit 240, and a free, radially outer end 252 that is spaced from the inner end 250 by a collar width 262, taken in the radial direction (i.e. orthogonal to the cyclone axis 154). The collar width 262 can be any suitable distance, and may be, for example between about 0.01 inches and about 0.75 inches, between about 0.04 inches and about 0.25 inches and may be between about 0.08 inches and about 0.125 inches. The blocking collar 248 also includes, in this example, a first end surface 254 (an upper surface as illustrated in The first and second end surfaces 254 and 256 are separated from each other by a collar height 264, taken in the axial direction. The collar height 264 may be any suitable distance and may be, for example, between about 0.01 inches and about 0.75 inches, between about 0.04 inches and about 0.25 inches and may be between about 0.08 inches and about 0.125 inches. In some embodiments, the collar width 262 may be equal to the collar height 264. In other embodiments, the collar width 262 and collar height 264 may be different. In the illustrated configuration, a generally annular overhang region 266 is defined as a portion of the interior of the cyclone chamber 142 that is axially between the lower end wall 190 and the second end surface 256. The blocking collar 248 may be positioned at any suitable location along the length of the outlet conduit 240, including toward (and/or at) the inlet end 242, such that the first end surface 254 is generally flush with the inlet end 242, below the inlet end 242 of the outlet conduit 240 or at an intermediate location along the height (in the axial direction) of the outlet conduit 240. Referring to Optionally, the blocking collar 248 can be positioned so that it is between the cyclone air inlet 152 and the inlet end 242 of the outlet conduit 240 in the axial direction. Referring again to Alternately, or in addition, the blocking collar 248 may be configured so that its side wall 258 is radially spaced inwardly from the fluid inlet 152. Referring to the embodiment of The blocking collar 248 may be of any suitable configuration, including the generally annular, ring-like shape shown in the embodiments of Alternatively, the blocking collar 248 may have a different configuration. Referring to When the treatment units 130 shown in Referring to The lower screen 290 may be generally axially extending, as shown in Referring to This generally tapered configuration may help facilitate the removal of hair and other such debris, as a user may be able to more easily slide the hair axially along the narrowing screen 290 and/or 246. In the embodiment of Optionally, the lower screen 290 can be arranged so that is spaced radially inwardly from the radially inner end of the cyclone fluid inlet 152 by a radial screen offset distance 292. This distance 292 may be any suitable distance, and may be, for example, between about 0 and about 0.5 inches, and may be between about 0.05 inches and about 0.25 inches, and between about 0.1 inches and about 0.15 inches. This may help prevent hair and other debris accumulating on the lower screen from blocking the fluid inlet 152. The following is a description of a collection region for a treatment unit that is configured to separate liquid and solid debris from an incoming dirty fluid flow using a single treatment stage, such as a cyclonic separation apparatus. This treatment unit may be suitable for use with the surface cleaning apparatuses described herein, for example as an alternative to the dual stage cleaning units. In accordance with this aspect, a single collection region may extend to a position below the separation chamber (e.g., it may be longer than the separation chamber). Alternately, or in addition, the collection region may be subdivided, such as by a screen or other water permeable material, into a liquid collection region at a lower end and a solid collection region above the screen. In the embodiments of Alternatively, as exemplified in An advantage of providing a combined collection chamber 144, 148 with a greater axial height is that liquid is less likely to slosh or otherwise travel back into the cyclone chamber when the apparatus is in use, particularly if the apparatus is an upright apparatus and the upright section containing the combined collection chamber 144, 148 is reclines. In addition to having an increased axial height, or if the axial heights of the cyclone chamber and combined collection chamber 144, 148 are the same, a divider may be positioned in the combined collection chamber 144, 148 to help separate the liquid and solid debris that is ejected from the separated element outlet 156. The divider may be liquid permeable, such as a screen or mesh, such that liquid debris may tend to flow through the divider due to gravity while solid debris of a given size is caught by the divider. This may help segregate the liquid and solid debris. Referring to In this embodiment, the debris divider 298 functions as a porous/permeable a lower wall of solid collection chamber 144. Also in this configuration, liquid exiting the cyclone chamber 142 travels through the solid collection chamber 144 before reaching the liquid collection container 148. That is, the liquid collection container 148 is generally downstream from the solid collection chamber 144. The divider 298 may also function, in some embodiments, as a backflow inhibiting apparatus. For example, while illustrated in a generally upright configuration in Providing a divider 298 as shown in Optionally, the divider 298 may be configured to extend both horizontally and axially. This may help provide an arrangement in which the screen has a larger surface area. Referring to The upright section 148 Optionally, as shown in the embodiment of In the embodiments in which the divider 298 includes both lateral and axial portions, dirty fluid, liquid and debris can travel through the screen in two or more different directions. For example, referring to the embodiment of It will be appreciated that, in these embodiment, the cyclone chamber and the solid and wet storage chambers may be concurrently emptied by opening a lid or top surface 196 of the treatment unit (see Single Stage Separator with Dual Separators In accordance with another aspect, that may be used with one or more of the other aspects disclosed herein, a single separator stage may include two or more separators arranged in parallel with each other in the fluid flow path. Such a separator may be considered a single stage separator as the multiple separators, such as two or more cyclone chambers 142, are arranged in parallel and not in series with each other (i.e. one cyclone chamber 142 is not downstream from the other cyclone chamber 142). Providing multiple separators in a single stage may help increase the efficiency of the separator stage and/or may help increase the total amount of incoming fluid that can be treated by the separator stage. This may also allow each individual separator to be smaller than a single separator that is configured to handle the same volume of fluid flow, which may help reduce some of the dimensions of the separator stage (e.g. it may be relatively shorter than a comparable single separator). Referring to In this embodiment, dirty fluid can enter the separator stage 132 via a stage inlet passage 422, and the cyclone chamber fluid inlets 152 of each cyclone chamber 142 are in communication with the stage inlet passage 422. Each cyclone chamber 142 may include a single fluid inlet 152 as shown in other embodiments herein or, as illustrated in Referring also to Single Stage Separator with Dual Separated Element Outlets In accordance with another aspect, that may be used with one or more of the other aspects disclosed herein, instead of including a single separated element outlet through which both solid and liquid debris and travel from the cyclone chamber to the collection chamber (as shown in Optionally, the separated element outlets may be provided at different locations/positions within the cyclone chamber, which may help facilitate separated debris to exit the cyclone chamber. Optionally, one separated element outlet may be provided toward a first or upper end of the cyclone chamber, and another separated element outlet may be provided toward an opposing second or lower end of the cyclone chamber. In such configurations, the upper separated element outlet may receive mostly solid debris, while separated liquid may tend to collect toward the bottom of the cyclone chamber and may tend to exit via the lower separated element outlet. Providing a separated element outlet toward the lower end of the cyclone chamber may help separate water to drain from the cyclone chamber, and may help reduce the likelihood of the separated liquid becoming re-entrained, creeping up the outside of the outlet conduit 240 or otherwise being drawn into the cyclone chamber air outlet 158. Referring to When this cyclone chamber is in use, solid debris may tend to be separated from the air stream and travel toward the upper end of the cyclone chamber 142, while at least some of the liquid separated from the incoming dirty fluid (and possibly some solid debris) may tend to collect on the bottom wall 190 of the cyclone chamber. In this arrangement, solid debris may tend to be discharged from the cyclone chamber 142 via the upper separated element 156 The exemplified cyclone chamber is suitable for use with any surface cleaning apparatuses 100 described herein (e.g., either mounted in the surface cleaning head 102 or on the upright section 116). The cyclone chamber may be a first stage, a second stage or optionally may be a single stage as exemplified in Single Stage Separator with Uniflow Cyclone Chamber In accordance with another aspect, that may be used with one or more of the other aspects disclosed herein, the cyclone chamber(s) 142 may configured such that the cyclone chamber fluid inlet 152 and the cyclone chamber air outlet 158 are positioned toward the same end of the cyclone chamber 142. Embodiments in which the cyclone chamber fluid inlet 152 and the cyclone chamber air outlet 158 are at a lower end may be referred to as inverted cyclones. Alternatively, the cyclone chamber 142 may be configured with the cyclone chamber fluid inlet 152 and the cyclone chamber air outlet 158 at different ends of the cyclone chamber 142 and may be referred to as a uniflow cyclone chamber. Optionally, as illustrated in the embodiment of In addition, the screen 246 that covers the cyclone chamber air outlet 158 can be arranged such that it extends downwardly from the upper end wall 192 of the cyclone chamber 142 ( While shown as part of a treatment unit 130 that includes two cyclone chambers 142 in parallel, the uniflow cyclone design could be used in treatment units that include only a single separator, and may be used in combination with any of the other features described herein. Treatment Unit with Pre-Motor Filter In accordance with another aspect, that may be used with one or more of the other aspects disclosed herein, the pre-motor filter chamber 161 may be included as part of the treatment unit 130 (see for example In the example, of In the illustrated embodiment, the pre-motor filter 160 is a formed from a porous, physical filter media (e.g. foam, felt and the like) and has an upstream side 428 and an opposing downstream side 430. In this embodiment, the upstream side 428 is positioned below and generally faces the cyclone chamber air outlets 158 for each cyclone chamber 142. That is, both cyclone chambers 142 are in communication with a common pre-motor filter chamber 161 and air exiting both cyclone chambers 142 is treated by a common pre-motor filter. Optionally, the upstream side 428 of the pre-motor filter 160 may be generally flat or planar, and may lie in a filter plane 432. Separator with Inclined Pre-Motor Filter In accordance with another aspect, that may be used with one or more of the other aspects disclosed herein, the filter plane 432 can be inclined relative to a reference plane 434 that is orthogonal to the direction of air flow through the pre-motor filter 160. In this example, the reference plane 434 is also generally orthogonal to the cyclone axes 154 and is generally horizontal as illustrated in Alternatively, as shown in the embodiment of Single Stage Separator with Openable Filter Chamber In accordance with another aspect, that may be used with one or more of the other aspects disclosed herein, the pre-motor filter chamber may be openable, optionally while the pre-motor filter chamber is installed in the surface cleaning apparatus or if the pre-motor filter chamber is included as part of the treatment unit (such as treatment unit 130) and is removable from the rest of the surface cleaning apparatus with the treatment unit and may be openable. For example, at least one of the walls defining the pre-motor filter chamber may be removable or otherwise openable. Optionally, the pre-motor filter may remain in the pre-motor filter chamber when the chamber is opened, or alternatively the pre-motor filter may be removable with the openable wall portion (such that removing the wall also automatically extracts the pre-motor filter from the pre-motor filter chamber). Optionally, the treatment unit may be configured so that the upstream side of the pre-motor filter is visible to the use when the pre-motor filter chamber is opened. This may help a user easily visually inspect the condition of the pre-motor filter. Referring to In the illustrated configuration, the pre-motor filter 160 is mounted on the openable bottom wall 442, and is removable from the treatment unit 130 with the bottom wall 442. In this arrangement, the upstream side 428 of the pre-motor filter 160 is revealed when the bottom wall 442 is detached. Alternatively, the treatment unit 130 could be configured to retain the pre-motor filter 160 while the bottom wall 442 is detached. In such embodiments, the downstream side 430 of the pre-motor filter 160 would be revealed when the bottom wall 442 is opened. If a separation stage includes more than one cyclone chamber, then a common pre-motor filter 160 may be provided and may, e.g., underlie both cyclone chambers 142, and a portion of the fluid inlet passage provided therebetween and is forward of the solid collection chamber 144. In other embodiments, separate pre-motor filters 160, in respective pre-motor filter chambers 161 may be provided for each cyclone chamber 142. Optionally, instead of being positioned below the cyclone chamber(s) 142, the pre-motor filter chamber 161 may be positioned above the cyclone chamber(s) 142. Referring to Separator with Flow Control Baffles In accordance with another aspect, that may be used with one or more of the other aspects disclosed herein, instead of, or in addition to a porous, divider, the treatment unit 130 may include one or more flow limiting devices to help prevent back flow of liquid from the liquid collection container 148 into the cyclone chamber 142. The flow limiting device may be used with a combined collection chamber 144, 148 and may be configured to allow liquid to flow from the solid collection chamber 144 into the liquid collection container 148 and help prevent unwanted backflow. It is also preferable that the flow limiting device can allow the liquid to be emptied from the liquid collection container 148 when desired. Referring to The baffle width 302 is selected so that the baffle 300 is large enough to prevent the back flow of liquid, and to extend above a free surface 308 of the liquid when the liquid collection container 148 is filled to its predetermined “fill” line. In this configuration, the baffle 300 may substantially prevent the backflow of liquid when the treatment unit 130 is inclined with its rear end toward the floor (as shown). To empty the liquid collection container 148, the liquid collection container 148 can be provide with an openable drain to help remove the liquid. Referring to A plurality of baffles 300 may also be provided. As exemplified in Optionally, as shown in the embodiment of The baffles 300 may be formed from any suitable material, including plastic, metal, open cell material, rubber, polymers and the like. The baffles 300 may be generally liquid impervious (i.e. generally non-porous such that they do not absorb liquid) or may be at least partially liquid pervious and/or absorbent. Configuring the baffles 300 to be absorbent may help the baffles 300 to absorb and sequester at least some of the liquid they contact, which may further help prevent splashing and sloshing of liquid within the liquid collection container 148. Optionally, one or more of the baffles 300 may include an open cell foam material, and may have properties that are analogous to those of the sponge 316 described herein. Analogous compression members may also be provided in some embodiments to compress the baffles 300 and help extract retained liquid, if suitable. In accordance with another aspect, which may be used with one or more of the other aspects disclosed herein, a separation stage may include a collection chamber that receives at least liquid and optionally both liquid and solid particulate matter (such as exemplified in Optionally, the fluid flow path may include one or more flow limiting devices and/or may be configured as a generally one-way fluid flow path that can facilitate transfer of liquid from the solid collection chamber 144 to the liquid collection container 148 and inhibit and/or block flow in the opposite direction. One advantage of this design is that the flow back of separated liquid may be reduced or essentially prevented. A second advantage is that the liquid may be stored at a lower elevation, thereby lowering the center of gravity of the apparatus when filled and also reducing the hand weight perceived by a user. As exemplified in It will be appreciated that the valve may also be a one-way valve which permits the flow of water into container 148 but inhibits the flow of water out of container 148 into container 144 (e.g., a check valve or one-way port). The valve may be open in a normal operating state but close when a sensor, float switch or the like determines that water is about to flow out of container 148 into container 144. Optionally, the treatment unit 130 can be arranged so that when the surface cleaning apparatus is in the floor cleaning orientation, the separated liquid collection container 148 is positioned below the solid collection chamber 144. This may help facilitate the separated liquid passing from the solid collection chamber 144 to the separated liquid collection container 148 by gravity flow (e.g. As exemplified in As exemplified in Alternately, or in addition, the treatment unit 130 may be configured so that at least a portion of the liquid collection container 148 is provided in the surface cleaning head 102, or other suitable location, that is further remote from solid collection chamber 144 and cyclone chamber 142. For example, the cyclone chamber 142 and solid collection chamber 144 may be provided on the upright section 116, and optionally may be part of a removable cleaning unit 120, while at least a majority of the liquid collection region, including the liquid collection container 148 is provided as part of the surface cleaning head 102. This may help lower the centre of gravity of the apparatus 100, and may help reduce the weight that a user carries when holding and maneuvering the upright section 116. Liquid may be conveyed from the solid collection chamber 144 to the remote liquid collection container 148 using any suitable liquid flow conduit or passage, and may travel under the influence of gravity or be assisted, such as by a pump. Referring to Optionally, a moisture sensor, such as sensor 342 ( Optionally, the liquid flow conduit 380 may be of any suitable length and configuration and optionally may be separable into at least two portions connected by any suitable coupling, as shown in the embodiment of Optionally, any suitable valve, such as the check valve 383 ( Optionally, the liquid collection container 148 can be removable from the surface cleaning apparatus 100 for emptying, and optionally may be configured as a disposable or single-use container. In such embodiments, one liquid collection container 148 containing dirty liquid can be discarded by a user, and a different, empty liquid collection container 148 can be inserted in its place. This may help reduce the chances of the dirty liquid spilling when the liquid collection container 148 is emptied. Optionally, both the upper and lower ends of the treatment unit 130 can be openable, which may allow liquid to be removed from the bottom, while solid debris, retained above divider 298 is emptied via the top. In another embodiment, shown in In accordance with another aspect, which may be used with one or more of the other aspects disclosed herein, the treatment unit 130 may include one or more liquid sequestering members that can be configured to at least temporarily retain/sequester liquid that is collected in the liquid collection container 148, to help prevent backflow. Such liquid sequestering members may be formed from any suitable material(s), and may include open cell materials such as sponges and foams and/or absorbent materials such as polymers, fibrous materials and the like. Optionally, the liquid sequestering member may be configured to be single-use members and optionally may generally permanently retain the liquid to which it is exposed. For example, the liquid sequestering member may include an absorbent material that absorbs water (e.g., it may swell when it absorbs water). When the surface cleaning apparatus 100 is in use, some or all of the water received in the liquid collection container 148 may be absorbed by the absorbent material, which may help reduce splashing or sloshing of the liquid and/or may help prevent liquid reentering the separator (e.g., cyclone chamber) from the liquid collection container 148. When the liquid collection container 148 is emptied, the absorbent material, containing the absorbed liquid, may be discarded and optionally replaced with fresh absorbent material. In these embodiments, the liquid sequestering member may also function as a baffle (similar in function to baffles 300) to help reduce the splashing and/or sloshing of liquid within the liquid collection container 148. For example, in some embodiments the liquid sequestering member may absorb some of the separated liquid that accumulates within the liquid collection container 148, while some of the liquid can remain unabsorbed (for example if the liquid sequestering member becomes saturated) and may flow within the liquid collection container 148 as it moves during use. The presence of the liquid sequestering member may act as at least a partial barrier to the flow of such liquid, in a manner analogous to the other examples of flow controlling baffles 300 described herein. Alternatively, the liquid sequestering member may be re-usable (e.g. an open cell material), such that it can absorb a first quantity of liquid and then be drained, dried or otherwise regenerated such that it can absorb a second quantity of liquid. Optionally, the liquid sequestering member may be generally rigid, and may retain a generally consistent shape during the different phases of its use. Alternatively, the liquid sequestering member may be deformable. This may help with insertion and removal of the liquid sequestering member within the liquid collection container 148. This may also help extract the liquid that has been retained within the liquid sequestering member. For example, a liquid sequestering member that is configured as a generally deformable open cell foam member may be deformed, e.g. squeezed, to help extract the liquid that has been absorbed by the open cell foam. Optionally, the surface cleaning apparatus 100 may include an actuator to engage the liquid sequestering member and help dislodge and/or extract liquid that has been captured by the liquid sequestering member. For example, if the liquid sequestering member is deformable, the surface cleaning apparatus 100 may include a compression member that can be used to squeeze/compress the liquid sequestering member from an uncompressed state (in which liquid is retained) to a compressed state (whereby liquid is released from the liquid sequestering member). The compression member may be any suitable structure, including, for example a plate, plunger, piston, grill, screen and the like. Referring to As exemplified in Optionally, the help drain away liquid that has been squeezed out of the sponge 316, the liquid collection container 148 can include an optional liquid outlet that is located, e.g., at a lower elevation than the sponge 316 when the liquid collection container 148 is in an emptying configuration/orientation. In this arrangement, liquid that is squeezed out of the sponge 316 can fall downwardly under the influence of gravity, and then drain from the liquid collection container 148 via the liquid outlet. This may help prevent re-absorption of the liquid when the sponge expands after compression is terminated. In this embodiment, a drain port 297 is provided at the lower end of the liquid collection container 148 and can be selectively opened by the user (automatically and/or manually) to allow the liquid to drain. In this embodiment, when the liquid outlet is opened and the sponge 316 is compressed, liquid trapped in the sponge 316 can exit the separated liquid container 148 through the liquid outlet (port 297) while the sponge 316 remains in the separated liquid container 148. Port 297 may be opened automatically when the compression member is actuated, e.g., the port may be opened concurrently or sequentially with the actuation of the compression member. While the drain port 297 shown as being positioned below, and underlying the sponge 316 in Alternatively, the treatment unit 130 may be intended to be inverted about 180 degrees when being emptied, for example by opening the lid 192. In such embodiments, the sponge 316 may be positioned above the open end of the solid collection chamber 144 and liquid collection container 148, and liquid that is squeezed from the sponge 316 may exit via the same opening that is used to drain the non-sequestered liquid and the dry dirt/debris (e.g. by flow through screen 298 and then out the open end of the solid collection chamber 144). This may eliminate the need for the separate drain port 297. Optionally, the sponge 316 can be loosely received within the liquid collection container 148 such that it may be movable within the liquid collection container 148 while the treatment unit 130 is in use. Alternatively, the sponge 316, or any other suitable liquid sequestering member, may be mounted within the liquid collection container 148 (such as by using a frame, clips, fasteners and the like) so that it is held in a generally fixed position while the treatment unit 130 is in use. Alternately, it may be held in position by a friction fit. Optionally, the sponge 316 can be configured such that it will remain in place within the liquid collection container 148 when the liquid collection container 148 is opened (such as by opening lid 192). This may allow a user to open the lid 192 without having to extract the sponge 316 from the liquid collection container 148. This may be helpful if, for example, a user wishes to open the lid 192 to inspect the interior of the treatment unit 130 but does not wish to touch the sponge 316 or empty the liquid. Alternatively, the sponge 316 may configured so that it is removed automatically when the lid 192 is opened. For example, the sponge 316 may be connected to, or mounted to an underside of the lid 192, such that when the lid 192 is opened the sponge 316 moves with it and is at least partially (and optionally entirely) removed from the liquid collection container 148. This may help facilitate access to the sponge 316, and may allow a user to remove the sponge 316 from the liquid collection container 148 by manipulating the lid 192 and without having to directly touch the sponge 316. Flexible and/or Inflatable Liquid Collection Container In accordance with another aspect, which may be used with one or more of the other aspects disclosed herein, a liquid reservoir, such as the liquid collection container 148, may be at least partially, and optionally entirely, formed from a generally flexible, pliable and/or expandable material. In some examples, the liquid collection container 148 may be configured as an inflatable, bladder like container that can have a relatively small volume/size when empty, and can be inflated/expand as it is filled with separated liquid. This may help reduce the overall size of the liquid collection container 148 when empty. Optionally, such a liquid collection container 148 may also be detachable, preferably as a sealed unit, and may be disposable (e.g. single use) without requiring the user to open or empty the separate liquid from the separated liquid container 148. Referring to In this example, opening the common upper wall 192 can provide simultaneous access to the interior of the cyclone chamber 142, the solid collection chamber 144 and the separate liquid container 148 for emptying/removal as desired. Optionally, at least a portion of an inflatable liquid collection container 148 may be nested within one or more liquid reservoir tanks 200 or a cleaning solution tank. This may help reduce the overall size of the surface cleaning apparatus 100. As the liquid collection container 148 is nested within another liquid tank and is an expandable-type container, it will occupy relatively little volume when empty, and expand to occupy more volume within the reservoir tank 200 as more separated liquid is collected. As the surface cleaning apparatus 100 is in use, clean liquid may be dispensed from the reservoir tank 200, thereby reducing the volume of liquid retained in reservoir tank 200. As liquid is collected, the expandable liquid collection container 148 may expand into the interior of the reservoir tank 200, and may occupy some of the space that was previously occupied by clean liquid. This may allow the same volume/region within the apparatus 100 to be used for storing both clean liquid and dirty liquid, at different times. This may help reduce the overall size of the surface cleaning apparatus 100. Referring to Optionally, the expandable/inflatable liquid collection containers 148 may be formed from a resilient material, such as rubber, neoprene and the like, such that they may tend to resist expansion, and may tend to automatically shrink back to their deflated configuration when empty. Liquid Delivery System, Optionally with an Externally Positioned Pumping Member In any aspect disclosed herein, the surface cleaning apparatus 100 may also include a liquid delivery system for distributing water, a hard floor cleaning solution, a carpet cleaning solution and the like onto the surface to be cleaned. This liquid can then be extracted from the surface using the apparatus 100. Any such onboard liquid delivery system may be of any suitable configuration, and may include, for example, and suitable liquid reservoir(s), actuators such as pump(s), liquid conduits, mixing chamber(s), spray and application nozzle(s) and the like. Each component of the liquid delivery system may be at any location on apparatus 100. Various embodiments are disclosed herein. The liquid delivery system may be configured to provide any suitable cleaning solution, including one or more of water, bleach, a hard floor cleaning solution, a carpet cleaning solution. In the exemplified embodiment of In this example, the liquid reservoir apparatus 162 is provided on the rear side of the cleaning unit 120, and at a higher elevation than the first separator 132. In this configuration, the liquid reservoir apparatus 162 will be positioned generally below the suction motor 124 and second separator 134 when the upright section 116 is reclined into the surface cleaning position (such as in The liquid reservoir apparatus 162 may also include any suitable pump (or optionally more than one pump) that can help convey the liquid from the liquid reservoir apparatus 162 to the delivery nozzle(s) 164. The pump may be any suitable type of pump, including, for example, a rotary lobe pump, a progressive cavity pump, a piston pump, a rotary gear pump, a diaphragm pump, a screw pump, a positive displacement pump (such as a peristaltic pump) and the like. The pump may be provided close to a tank of liquid reservoir apparatus 162, inside the tank, close to the delivery nozzle 164 or at any suitable location along the delivery line extending therebetween. The pump may optionally be attached to the same portion of the surface cleaning apparatus 100 as the tank (i.e., both in the cleaning unit 120, both in the surface cleaning head 102, etc.), or alternatively the tank and pump may be provided at different locations on the apparatus 100 (e.g., the tank may be in the cleaning unit 120, while the pump is provided in the surface cleaning head 102). Spacing the pump away from the tank may help reduce the overall size of the apparatus 100, and may help with the overall weight distribution of the apparatus 100. Optionally, the pump may be configured such that the pump components are exposed to the liquid being pumped. For example, the liquid may come into direct contact with a rotating pump impeller. Alternatively, the pump may be configured so that it remains external the liquid flow, and the pump components do not come into direct contact with the liquid being pumped. Configuring the pump in this manner may help reduce contamination/fouling of the pump components. This may also help prevent the likelihood of cross-contamination between liquids, if a single pump is used, sequentially, to pump two or more different liquids. This may be preferable if the apparatus 100 can be configured to use different types of cleaning chemicals/solutions based on the nature of the surface to be cleaned. Some surfaces may be cleaned using an acidic cleaning solution, while others may be cleaned with, for example, a basic cleaning liquid. Exposing the internal components of the pump 204 to the liquid being pumped may lead to some degree of cross-contamination and/or chemical reaction if a basic liquid were to be introduced into a pump cavity containing traces of an acidic liquid—or vice versa. The use of a pump in which the pump components are not directly exposed to the liquid being pumped may help prevent such cross-contamination. In the embodiment shown in Optionally, the liquid reservoir apparatus 162 may include a heater to help heat the liquid before it is applied to the surface to be cleaned. The heater may be utilized to heat the liquid as it is held in the reservoir tank 200, and/or a heater may apply heat to the liquid delivery lines 202 that carry the liquid from the reservoir tank 200 to delivery nozzle 164. In the embodiment of Liquid Delivery System that can Apply Two Different Cleaning Solutions In accordance with another aspect, which may be used with one or more of the other aspects disclosed herein, the liquid delivery system may be configured to be operable to alternately deliver two different liquids, such as a carpet cleaning solution and a hard floor cleaning solution and may include any suitable actuator so that the cleaning solution delivery system can be switched between a hard floor cleaning actuation mode in which the cleaning solution delivery system delivers the hard floor cleaning solution to at least one delivery nozzle 164, and in a carpet cleaning actuation mode, in which the cleaning solution delivery system delivers the carpet cleaning solution to the at least one delivery nozzle 164. It will be appreciated that each solution may be delivered to the same delivery nozzle(s) or that one liquid may be supplied to one delivery nozzle(s) and another solution may be delivered to another nozzle(s). Optionally, the actuator used to change the mode of the liquid delivery system may be manually activated by a user, and may include a button, trigger, switch, lever and the like. Alternatively, the actuator may be automatically controlled by a suitable controller (microcontroller, PLC or the like) and may include a detector that is able to determine the type of surface that is being cleaned in order to select and apply the appropriate cleaning solution, e.g., an optical sensor. Referring to Optionally, instead of a switch 448, the actuator for the liquid delivery system may include a detector that can determine the type of surface that is being cleaned (i.e. distinguish between hard floor surfaces and carpets) and provide output signals to the liquid delivery controller 450. This may allow the liquid delivery system to automatically select an appropriate cleaning solution to deliver based on the type of floor being cleaned, without requiring manual user input. In the embodiment of Optionally, the switch 448 may also control the operation of other portions of the surface cleaning apparatus 100, including the suction motor, rotating cleaning brushes and the like. For example, the switch 448 may linked to a controller that also controls the suction motor 124 and rotating brushes 172 and 174. As exemplified in Optionally, the reservoir tank 200 Optionally, one or more of the tanks 200 It will be appreciated that tank(s) 200 may be refillable in situ and therefor need not be replaced. Alternately, tank(s) 200 may be disposable. In such an embodiment, a user may purchase a new tank 200 and insert the new tank into the housing or enclosure for the tank. Upon insertion, a seal may be broken or pierced to connect the interior of the tank with the delivery system (e.g., like a Tetra Pak™). It will be appreciated that tank 200 need not be a hard walled tank but may be made of a flexible material. Optionally, tanks 200 For example, the tank 200 Alternatively, tank 200 Optionally, pumps 204 Optionally, instead or varying the motor 206 or pump 204 Optionally, instead of or in addition to using mechanical flow limiting devices, the deliver lines 202 Optionally, the delivery lines 202 For example, in the embodiment of Optionally, as shown in the embodiment of In other embodiments, such as shown in In a particular embodiment, the nozzle is removable with line 202. Accordingly, when a line or a tank is replaced, an entire new delivery line and nozzle may be installed. Liquid Delivery System with Water Reservoir and One or More Cleaning Solution Concentrates In accordance with another aspect, which may be used with one or more of the other aspects disclosed herein, instead of providing separate tanks 200 for storing different types of pre-mixed cleaning solutions (hard floor vs carpet, etc.), the liquid delivery system may include a water reservoir tank and one or more separate tanks holding cleaning solution concentrates (i.e. a cleaning solution in a form that is less suitable for direct application to a surface and that would typically be diluted with water before application). The system can then mix water from the water reservoir tank with an appropriate amount of a cleaning solution concentrate to provide the desired cleaning solution. In this arrangement, a common water reservoir source may be mixed with two or more different cleaning solution concentrates. Each cleaning solution concentrate material may be stored in suitable tank 200. Each concentrate tank 200 may be relatively smaller than a tank that would be used to hold the quantity of pre-mixed cleaning solutions that would provide the same amount of cleaning solution application. This may help eliminate the need to a provide full size tanks 200 for each time of pre-mixed cleaning solution, which may help reduce the overall size and weight of the surface cleaning apparatus 100. For example, the liquid reservoir apparatus 162 of In this example, the liquid reservoir apparatus 162 may be operated in a water only actuation mode to dispense water from tank 200 In addition to mixing to a pre-set ratio, the amount of water dispensed to be mixed with the concentrate solution may be modified on the fly by a user or apparatus controller. Supply rate of the water (or other liquid) may be altered by providing different sized supply lines, changing the operating speed of one or both pump 204 For example, the amount of water drawn from tank 200 Mixing the cleaning solution on-demand, that is just before it is to be applied to the floor, may also be advantageous if the cleaning solution includes one or more active ingredients or compounds that have a relatively short lifespan, and/or may tend to degrade or become less effective when stored for prolonged periods. For example, some ingredients in a given concentrate may be configured to be activated when exposed to water, air or the like, but may remain relatively stable when in concentrate formulation (optionally in a modified atmosphere tank to help prolong shelf life). It may be desirable to mix such ingredients with water immediately prior to spraying the solution on the floor to help maximize the effect of the activated ingredients. Optionally, instead of water, a cleaning solution may be provided in two-part format such that the solution becomes active when the parts are mixed. One part of the solution could be stored in tank 200 Providing concentrate solution, instead of pre-mixed cleaning solution, may also reduce the volume of the cleaning solution that needs to be stored and carried in the liquid reservoir apparatus 162, which may help reduce the overall size and weight of the apparatus 100. Optionally, as shown in the embodiment of Optionally, as shown in the embodiment of Optionally, if the liquid reservoir apparatus 162 is configured to utilize concentrate solution, as opposed to pre-mixed cleaning solutions, it may not be necessary in all embodiments for the liquid reservoir apparatus 162 to be configured to allow the concentrate solution (i.e. the contents of tank 200 Referring to The pre-filled cartridge may be of any suitable construction, and may be, for example, a rigid plastic container, a Tetra Pak™ type container, a flexible bag or bladder like container that is deformable and the like. If the cartridge is not intended to be self-supporting and/or visible when the apparatus 100 is in use, the liquid reservoir apparatus 162 may be provided with a suitable housing and/or compartment to receive and support the cartridge in a surface cleaning position (as shown in This embodiment also includes a flow control valve 224 that is illustrated as being non-removable, but could be integrated with and removable with the cartridge in some embodiments. Providing a fixed flow control valve 224 may be advantageous as it may allow the valve 224 to be used with multiple cartridges. When this liquid reservoir apparatus 162 is in use, water can be drawn from tank 200 Optionally, one or more replacement and/or substitute cartridges can be provided for use with the liquid reservoir apparatus 162, as shown using dashed lines in Optionally, the liquid reservoir apparatus 162 may be configured to include more than two separate tanks, and in some embodiments may be configured to include one common water tank, along with two or more cartridges of different concentrate solutions. This may help facilitate the on-demand mixing of two or more different types of cleaning solutions, using a common on-board water source. Referring to Optionally, at least a portion of the delivery lines 202 Referring to Is this embodiment, the delivery line 202 Providing swappable cartridge assemblies 232 While shown with two cartridges 200 Optionally, the liquid reservoir apparatus 162 can be operated in a line flush mode, in which only water is dispensed through the system to flush the lines, mixing chambers (if any) and nozzles 164 and substantially remove the traces of a first chemical or cleaning solution from the apparatus, before dispensing a second, different chemical or cleaning solution through the apparatus. This may help avoid mixing different chemicals or cleaning solutions together. Such a mode may be used to deliver unmixed water to a surface to be treated. Optionally, in addition to operating the pumps and control valves as described herein, or as an alternative to such manipulations, the delivery lines leading from the different tanks 200 Liquid Delivery System with Non-Interchangeable Tanks In accordance with another aspect, which may be used with one or more of the other aspects disclosed herein, if the liquid delivery system includes two or more tanks and/or cartridges that are intended to hold different cleaning solutions and/or cleaning solution concentrates, such as a hard floor cleaning solution cartridge and a carpet cleaning solution cartridge, the liquid delivery system may be configured to help ensure that each cartridge is connected to the liquid delivery system in a desired, appropriate manner. This may be achieved, e.g., by the cartridges or cartridge assemblies not being physically interchangeable or by the cartridges or cartridge assemblies being coded such that apparatus 100 will not operate if a cartridge or cartridge assembly is installed in the wrong location. According to this aspect, the liquid reservoir apparatus 162 may be configured so that each removable tank or cartridge assembly has a different physical shape, size, connection mechanism and the like, such that a cartridge 200 Optionally, cartridges and/or tanks that are intended to be inserted into the liquid reservoir apparatus 162 may be coded, e.g., they may be provided with some type of identifying indicia, such as a bar code, QR code, RFID tag and the like. The surface cleaning apparatus 100 may be provided with any suitable type of reader, such that the surface cleaning apparatus 100 can identify a particular cartridge that is inserted into the liquid reservoir apparatus 162. Based on this information, the surface cleaning apparatus 100 may be operable to automatically adjust one or more of the parameters of the liquid reservoir apparatus 162 or other components. For example, the liquid reservoir apparatus 162 may automatically select an appropriate water supply rate, pump operation rate, and chemical supply rate based on the contents of a given cartridge, so that the cleaning solution is mixed to an appropriate concentration when dispensed. Referring to Surface Cleaning Head with Two Rotating Agitators In accordance with another aspect, which may be used with one or more of the other aspects disclosed herein, apparatus 100 may include two or more different types of brushes, each of which is intended for use with a different surface. In the embodiments of Whether driven with separate brush motors, or using a single brush motor, the agitators 172 and 174 may optionally be rotated at the same speed while the surface cleaning head 102 is in use, or alternatively may be rotated at different speeds. In addition, which of the rotating agitators 174 and 172 is rotated during a cleaning operation may be based on the cleaning mode being utilized. For example, the surface cleaning head can be configured so that when it is in the hard floor cleaning actuation mode, the rotating hard floor cleaning brush 174 is rotated and the rotating carpet cleaning brush 174 is stationary and when it is in the carpet cleaning actuation mode, the rotating hard floor cleaning brush 174 is stationary and the rotating carpet cleaning brush 174 is rotated. Alternatively, in both the hard floor cleaning actuation mode and the carpet cleaning actuation mode, both the rotating carpet cleaning brush 174 and the rotating hard floor cleaning brush 174 may be rotated. Optionally, the rotational rates of the rotating carpet cleaning brush 172 and the rotating hard floor cleaning brush 174 may be variable, and may be adjusted independently from each other. The rate of rotation for a given agitator 172 or 174 may be based on a variety of factors, including the type of surface being cleaned and the cleaning mode of the surface cleaning apparatus. For example, when the surface cleaning apparatus 100 is operated in the hard floor cleaning configuration, the rotating hard floor cleaning brush 174 may be rotated at a first rate of rotation (that may help prevent damage to a hard floor surface and/or reduce the likelihood of debris being scattered across the hard surface by the agitators), and when in the carpet cleaning configuration, the rotating hard floor cleaning brush 174 may be rotated at a second, faster rate of rotation that may help clean the carpet. For example, the rotating hard floor cleaning brush 174 (and/or optionally rotating carpet cleaning brush 174) may be rotated about its rotation axis 175 at a speed that is selected so that the radially outer portions of the rotating hard floor cleaning brush 174 (i.e. portions of its outer surface) have a tangential speed (i.e. velocity in the tangential direction) that is between about 75% and about 125% of the linear, forward travel speed of the surface cleaning head 102 as it travels across the surface. The speed of rotation of the brushes may be adjusted based on the surface being cleaned. For example, if a carpet is being cleaned, then the speed of the rotating hard floor cleaning brush 174 may be selected so that it is approximately the same as the forward travel speed of the surface cleaning head 102 when travelling over a carpeted surface. Selecting a speed of this nature may reduce the relative movement between the outer portion of the rotating hard floor cleaning brush 174 and the carpeted surface (optionally to approximately zero), which may help reduce wear of the rotating hard floor cleaning brush 174. This may be automatically achieved by a sensor, e.g., a torque sensor that determines the torque applied to a rotating hard floor brush while the apparatus is in a carpet cleaning mode (it is used to clean a carpet). Similarly, if a hard floor is being cleaned, the speed of the rotating carpet cleaning brush 172 may be selected so that it is between about 75% and about 125% of the linear, forward travel speed of the surface cleaning head 102 when travelling over a hard floor surface. When in the hard floor cleaning mode, the rotating hard floor cleaning brush 174, and optionally the rotating carpet cleaning brush 174, may be rotated at a rate of rotation of between about 1000 and about 2400 RPM, and when in the carpet cleaning configuration, the rotating hard floor cleaning brush 174, and optionally the rotating carpet cleaning brush 174, may be rotated at a rate of rotation of about 2400 and about 5000 RPM. The different rotational speeds may be achieved by varying the speed of the brush motors (if two brush motors are provided) or altering a gearing ratio (if a single brush motor is provided) either manually (by a switch accessible to the user) or automatically based on a mode selection actuator or other suitable apparatus controller. The rotating agitators may be helpful when cleaning carpets and other surfaces, and may be of any suitable configuration. The two rotating agitators may be configured so that the diameter 412 of the rotating hard floor cleaning brush 174 is between about 75% and about 125% of the diameter 414 of the rotating carpet cleaning brush 174, and optionally the diameters 412 and 414 may be approximately the same. The rotating carpet cleaning brush 174 may be any carpet cleaning brush known in the art and may be provided with relatively stiff bristles, such as to help clean carpet, while the rotating hard floor cleaning brush 174 may be may be any hard floor cleaning brush known in the art, and may be provided with relatively softer bristles, such as to help clean hard floor surfaces. Optionally, the rotating carpet cleaning brush 174 may include one or more rows of relatively stiff (i.e. generally self-supporting) bristles that are provided around the circumference of the brush 172. For example, the rotating carpet cleaning brush 174 in Optionally, the rotating hard floor cleaning brush 174 may have an absence of stiff, self-supporting carpet cleaning bristles, and instead may have a generally continuous covering of relatively soft, flexible filaments, which in some embodiments may not be self-supporting. The surface may of the rotating hard floor cleaning brush 174 may have a generally soft, plush-like texture and may be similar to woven fabrics, microfiber, terrycloth or the like. In some embodiments, the rotating roller may include a plurality of generally radially extending elastomeric paddles that can be spaced apart from each other around the perimeter of the rotating hard floor cleaning brush 174, and may be interspersed between different types of flexible filaments or the like. The embodiment of Optionally, one or more debriding members, such as a comb 406, can be provided to engage the surface of the soft roller 174 and to help remove debris from the roller 174. The debriding member(s) may be positioned in any suitable position relative to the soft roller 174 and may, for example, be positioned to extend generally forwardly and downwardly from the inner surface of the brush chamber 354, and may engage an upper, rearward portion of the rotating hard floor cleaning brush 174 as illustrated in the embodiments of While shown as being different types of agitators, the two agitators shown may be the same, and may both be rotating brushes 172, rotating rollers 174 or other suitable agitators. The rotating agitators 172 and 174 may be housed in a suitable brush chamber within the surface cleaning head 102 that has a generally downwardly facing opening. The opening to the brush chamber may provide the dirty fluid inlet 104, and both liquid and solid debris may pass through the brush chamber as they are sucked into dirty fluid flow path. Alternatively, as shown in the embodiment of In another embodiment, shown in In yet another embodiment, as shown in Surface Cleaning Head with Front Roller In accordance with another aspect, which may be used with one or more of the other aspects disclosed herein, a hard floor brush 174 may be used to reduce and preferably inhibit air from travelling rearwardly between roller 174 and the surface being cleaned at least when the apparatus 100 is used in an extractor mode. AN advantage of this design is that the apparatus may be used to remove larger debris from the floor while enhancing the suction at a location of the liquid intake rearward of the roller 174. Referring to If a front soft, rotating hard floor cleaning brush 174 is utilized, the rotating hard floor cleaning brush 174 can be positioned so that it extends to and engages the floor, including a hard floor surface, when the surface cleaning head 102 is positioned on a hard floor surface. This may help limit the about of air that can pass beneath the rotating hard floor cleaning brush 174. In this arrangement the front of the surface cleaning head may be defined in part by a forward side of the soft, rotating hard floor cleaning brush 174. Accordingly, the plastic casing of the surface cleaning head may terminate, e.g., part way down the front of the soft, rotating hard floor cleaning brush 174. An advantage of this design is that larger debris, e.g., popcorn, may pass under the soft, rotating hard floor cleaning brush 174 to allow the surface cleaning head to remove debris from a surface (i.e. a vacuum cleaning operation) prior to using water and/or a chemical solution to clean the surface. In such a case, the soft, rotating hard floor cleaning brush 174 may effectively form a seal with the floor, and or the surface cleaning head, thereby inhibiting air travelling into a dirty air inlet from in front of the surface cleaning head and thereby increase the draw of fluid from, e.g., carpet. As exemplified, the front end 350 of the surface cleaning head 102 may be spaced above the floor by a front height 358. The front height 358 may be any suitable height and may be, for example, at least about 0.1 inches, about 0.2 inches, about 0.25 inches, about 0.3 inches, about 0.4 inches, about 0.5 inches, about 0.75 inches or more and may be less than about 3 inches, about 2.5 inches, about 2 inches, about 1.5 inches, about 1 inch or less. In some embodiments, the height 358 may be between about 0.25 inches and about 1.5 inches, between about 0.5 inches and about 1.25 inches and between about 0.75 inches and about 1 inch. Preferably, if the surface cleaning head 102 is configured to be used for both dry vacuuming and wet extracting, the front height 358 is selected so that the surface cleaning head 102 can be moved over common types of debris, such as dirt, sand and relatively larger objects that are on the floor. Providing a sufficient front height 358 may also help the surface cleaning head 102 to traverse changes in floor elevation, such as when moving onto a carpet, rug and/or across a transition to different flooring types. When operating in an extractor mode to pick up liquid, it may be desirable to help create at least a partial seal around the dirty fluid inlet 104. Providing some sealing around the dirty fluid inlet 104 may help improve its liquid pick-up performance, and may help create faster air flow velocities. To help provide such, at least partial, sealing, this embodiment of the surface cleaning head 102 includes a rotating hard floor cleaning brush 174 that has a generally continuous covering of soft hair or fibers or other flexible bristle elements—as compared to a rotating carpet cleaning brush 174 that includes relatively discontinuous, discrete tufts of bristles (hard or soft). The surface cleaning head 102 may be configured to include only the rotating hard floor cleaning brush 174 ( The covering of the roller 174 may contact the floor across substantially the entire width of the roller 174, which may help seal the front end of the surface cleaning head 102. This may create a relatively sealed region 360 between the roller 174 and the dirty fluid inlet 104, which may help improve liquid pick-up. Because of the flexible, pliable nature of the roller 174, it may be able to provide at least some sealing, while retaining the ability to deform around and accommodate relatively large pieces of solid debris. Optionally, the rotating hard floor cleaning brush 174 may also contact or otherwise engage at least a portion of the inner surface of the brush chamber 354 to help at least partially seal against the inner surface of the brush chamber 354. This may help prevent air from flowing around the upper portion of the rotating hard floor cleaning brush 174 and the inner surface of the brush chamber 354. Such engagement can be provided at any suitable point along the perimeter of the rotating hard floor cleaning brush 174, and preferably may be provided on a generally forward or upward facing portion of the rotating hard floor cleaning brush 174. For example, in the embodiment of In accordance with another aspect, which may be used with one or more of the other aspects disclosed herein, the dirty air inlet may be adjustable to have an increased air flow velocity or suction proximate the surface of a carpet so as to be able to draw more fluid from carpet during operation of apparatus 100 as an extractor. Accordingly, at least a portion of the air flow path within the surface cleaning head 102 may be movable or otherwise re-configurable to help adjust the relative height of the dirty fluid inlet 104 above the floor, e.g., during operation of apparatus 100 as an extractor. This may help modify the suction performance of the surface cleaning head 102. For example, the dirty fluid inlet 104 may be positioned relatively close to the floor when extracting liquids, and may be positioned relatively farther from the floor when vacuuming solids. In the embodiment of In this embodiment, a portion of the conduit 362 extends along a generally vertical inlet axis 370, and air entering the inlet end 368 may tend to travel generally parallel to the inlet axis 370. The surface cleaning head 102 may optionally include the delivery nozzle 164 and a portion of the associated delivery lines 202, as shown in Referring to Optionally, instead of orienting the conduit 362 such that inlet end 368 is generally downward facing and the inlet axis 370 is generally vertical, as shown in In accordance with another aspect, which may be used with one or more of the other aspects disclosed herein, the surface cleaning apparatus 100 may be configured so that at least one or optionally some, or optionally all of the operating components of the treatment unit 130 and/or cleaning unit 120, may be provided in the surface cleaning head 102, instead of on the movable upright section 116. Providing one or more of the components within the surface cleaning head 102 may help reduce the amount of weight a user has to hold when maneuvering the apparatus 100 via the upright section 116. It may also help lower the overall centre of gravity of the apparatus 100. This configuration may also simplify some portions of the fluid flow path, and reduce the distance and/or height that liquid needs to be translated within the fluid flow path. For example, one or more water containers (e.g., a clean water tank or clean solution tank 200 and/or a recovered liquid reservoir, may be provided as part of (e.g., in, on) the surface cleaning head 102. Accordingly, the weight of the liquid may be provided in the surface cleaning head, thereby lowering the hand weight of the drive handle of apparatus 100. As exemplified in In the example of Alternatively, the liquid reservoir 162 could be provided on the upright section, as indicated using dashed lines. Optionally, regardless of the position of momentum separator 140, the momentum separator 140 may be removable from the surface cleaning head 102 for emptying and/or maintenance. In some embodiments, regardless of the position of momentum separator 140, the momentum separator 140 may be removable with at least a portion of the fluid flow path between the dirty fluid inlet 104 and the momentum separator 140 may be removable for cleaning, and the surface cleaning head 102 may include a removable pipe, hose or other type of conduit. Optionally, the removable portion of the fluid flow path may be removable in unison with the momentum separator 140, or independently from the momentum separator 140. In accordance with another aspect, which may be used with one or more of the other aspects disclosed herein, the apparatus may be configured so that a particular cleaning solution is provided to a particular brush. Accordingly, instead of, or in addition to, providing a nozzle 164 to apply the cleaning solution to the floor (such as by positioning it on the front end 350 of the surface cleaning head as exemplified in In accordance with this aspect, a hard floor cleaning solution may be applied to the roller 174 that is intended to be used when cleaning hard floors, whereas a carpet cleaning solution may be applied to the rotating carpet cleaning brush 174 that is intended to be used when cleaning carpets. This may help facilitate the application of an appropriate cleaning solution onto an appropriate agitator and/or onto a desired type of surface to be cleaned. A surface cleaning head may include a single liquid applicator/nozzle that could be reoriented and/or repositioned to independently apply a different cleaning solution to each of the rotating agitators, and/or may include at least one separate liquid applicator/nozzle for each rotating agitator. Providing separate applicators for each rotating agitator may help prevent cross-contamination and/or mixing of different cleaning solutions that are used with different rotating agitators. It may also facilitate applying liquids (optionally different liquids) simultaneously to each rotating agitator. The cleaning solution applicators may be connected to any of the liquid delivery systems described herein, or other suitable source of cleaning solution. Referring to The rate at which a liquid is applied to either the rotating hard floor cleaning brush 174 or rotating carpet cleaning brush 172 may be variable (for example, by changing the operating speed of the pumps 204 The liquid may be applied at different rates to the different agitators 172 and 174. For example, in the hard floor cleaning mode, the cleaning solution may delivered at a first rate and in the carpet cleaning mode, the cleaning solution (either the same solution or a different solution) may be delivered at a second rate that is faster than the first rate. For example, liquids that are applied to the rotating hard floor cleaning brush 174 and intended for use in hard floor cleaning (e.g. hard floor cleaning solution) may be applied at a rate of between about 10 to about 100 mL/minute, while liquids that are applied to the rotating carpet cleaning brush 172 and intended for use in a carpet cleaning (carpet cleaning solutions) may be applied at a rate of at least 100 mL/minute. Optionally, instead of providing separate nozzles 164 Referring to If a single nozzle 164 is used, it may be connected to any suitable liquid delivery system and may optionally be selectably supplied with at least two different cleaning solutions. For example, a valve or other such mechanism may be provided upstream from the nozzle 164 and may be configured to selectably connect the nozzle 164 to a hard floor cleaning solution reservoir and a carpet cleaning reservoir. When the nozzle 164 is facing the rotating carpet cleaning brush 172 it may be connected to the carpet cleaning solution reservoir, and when it is moved to face the rotating hard floor cleaning brush 174 it may be connected to the hard floor cleaning solution reservoir. The operation of the valve may be manually, or may be linked to the orientation of the nozzle 164, the apparatus operating mode or the like and may be automatically controlled by a suitable controller. Optionally, the motor 206 Optionally, in the embodiments of In accordance with another aspect, which may be used with one or more of the other aspects disclosed herein, a fluid flow path has one or more openable and/or removable segments, which are upstream of the separator and may help facilitate maintenance and cleaning of the fluid flow path through which liquid travels. These embodiments of the fluid flow path may be used in combination with any of the other features and/or aspects of the surface cleaning apparatuses described herein, including any of the dual stage treatment units, single stage treatment units, recline limiting and/or mode controlling apparatuses, liquid delivery systems, surface cleaning heads, apparatuses with above floor cleaning mode(s) and/or lift away configurations, and may also utilize features described in relation to embodiments of the hand held surface cleaning apparatuses. When drawing in liquid, the interior for the fluid flow path upstream of the wet separator become dirty, blocked or otherwise fouled. For example, when the apparatus 100 is used in an extractor mode, at least some of the dirty liquid being extracted may tend remain in parts of the fluid flow path and those portions may not dry out during normal use and storage. Accordingly, odors may build up in those portions of the fluid flow path. Optionally, to help facilitate cleaning of the fluid flow path, at least one portion of the fluid flow path upstream of the separator may be removable from the rest of the apparatus 100. Preferably, the removable portion(s) can include portions of the fluid flow path that are likely to retain liquid. In particular one or more portions of the air flow path that extend from the surface cleaning head 102 to the liquid separator portion of the treatment unit 130 maybe removable. The removable portion of the fluid flow path may be a single, continuous portion or may include two or more removable segments. The two or more segments may optionally be configured to be independently removable, which may allow a user to remove some of the removable portion of the fluid flow path while leaving other segments in place. In some embodiments, the removable portion of the fluid flow path may be limited to rigid conduits, pipes, flexible hoses and other such fluid conveying members, but need not include any of the separators 132, 134 or other functional components of the surface cleaning apparatus. In other embodiments, the removable portion of the fluid flow path may include one or more separators or other functional components. For example, a liquid separator 132 may be removable in unison with at least a portion of the fluid flow conduits that extend from the dirty fluid inlet 104 to the liquid separator inlet 146 or other portion of the surface cleaning head 102 (see Referring to In this embodiment, the removable segment 372 need not form part of the structural support of the apparatus 100, and may be removably housed in corresponding frames 376 and extend through the pivot joint or other movable connection between the upright section 116 and the surface cleaning head 102. Alternatively, some or all of the removable segments of the air flow path may be structural, load bearing components. For example, the removable portion may include rigid conduit sections that can be attached together to form part of the upright section 116, surface cleaning head 102, a movable connection joining and supporting the upright section 116 to the surface cleaning head 102. The segments may be joined using any suitable latches, threaded connections, couplings, clips and the like. Optionally, the removable segment(s) 372 of the fluid flow path may include some, or the entirety of the movable joint that connects the upright section 116 to the surface cleaning head 102 (e.g. one or more pivot joints, rotatory joints and the like that are incorporated into the fluid flow path removable segment 372). Alternatively, removable segments 372 in the surface cleaning head 102 and upright section 116 (if any) may be independently removable, and may be coupled to a non-removable, movable joint. Referring to As exemplified in A removable portion may be provided in the fluid flow path of any suitable configuration of surface cleaning apparatus, including the embodiments shown in Optionally, as least some of the fluid flow path, and optionally at least some of the removable segments, such as a removable hose 372 in In accordance with another aspect, which may be used with one or more of the other aspects disclosed herein, the apparatus may include an above floor cleaning mode. These embodiments may be used in combination with any of the other features and/or aspects of any of the dual stage treatment units, single stage treatment units, recline limiting and/or mode controlling apparatuses, liquid delivery systems, surface cleaning heads, apparatuses with openable fluid flow paths and/or above floor cleaning mode(s, and may also utilize features described in relation to embodiments of the hand held surface cleaning apparatuses. In accordance with this aspect, the surface cleaning apparatus 100 may be operable in at least one above floor cleaning mode, in which air flow communication between the cleaning unit 120 and dirty fluid inlet 104 is interrupted, and one or more auxiliary dirty fluid inlets 104 The above floor cleaning mode(s) may be provided by reconfiguring at least a portion of the fluid flow path that was also utilized then operating in the floor cleaning mode (i.e. forms part of the air flow path between the dirty fluid inlet 104 and the cleaning unit 120) or by providing a different fluid flow path (i.e. portions of the fluid flow path between auxiliary dirty fluid inlet 104 In particular, an above floor cleaning wand and hose may not be part of the flow path when the apparatus is operated in an extractor mode. For example, when a user uses the apparatus to extract or pick up liquid, the wand and hose may be excluded from the flow path. One advantage of this design is that the wand and hose need not come into contact with water. This can prevent water being present in the wand and hose and causing fowling of the wand and hose and the buildup of odors therein. Also, the flow path to the separation unit may be shortened by excluding the wand and hose, which may reduce the energy required to draw liquid into the separator. Referring to For above floor cleaning, a user can detach an above floor cleaning member, which in this example includes the wand 125 and hose 122 ( In this embodiment of Alternatively, as illustrated in the embodiment of In this embodiment, the valve 378 is positioned between the fluid outlet 150 of the first separator 132 (liquid separator) and the inlet 152 of the second separator 134 (dry separator). When operating in a floor cleaning mode ( When a user wishes to switch to an above floor cleaning mode ( In this arrangement, the above floor cleaning mode may be limited to generally dry, vacuuming rather than wet suction/extraction, as the liquid separating portion of the treatment unit 130 has been removed from the above floor fluid flow path. The embodiments of the surface cleaning apparatus 100 in Optionally, in any suitable embodiment (including those described herein), the mode selection valve 378 may be manually actuated by a user. Referring to Optionally, the mode selection valve 378 may be configured to be automatically actuated by attaching and/or detaching a portion of the surface cleaning apparatus 100, such as a hose, wand, auxiliary cleaning tool and the like. For example, connecting a flexible hose to the cleaning unit 120 or moving the downstream end of a hose, such as for use with above floor cleaning, may automatically re-configured the mode selection valve 378 into an above floor cleaning position, in which air flow communication is established between the hose and the separator, from the floor cleaning position, in which air flow communication is established between the dirty fluid inlet on the surface cleaning head and the separator. Referring to Optionally, as shown in this example, the mode selection valve 378 may be biased toward one of its operating positions, such as the floor cleaning position as shown in Alternatively, the mode selection valve 378 may include a valve actuator that is drivingly connected to the valve 378 and the above floor cleaning member, such as the wand 125 can also be drivingly connected to the valve actuator. Referring to In this example, the valve 378 includes a movable gate 470 that can translate within a housing 472, between an lower position for above floor cleaning ( In this example, the gate 470 is moved automatically when the upstream end of the wand 125, which may form the auxiliary air inlet 104 Alternatively, a hollow conduit portion 470 Optionally, as shown in this example, the mode selection valve 378 may be biased toward one of its operating positions, such as the floor cleaning position as shown in It will be appreciated that, in a two stage separation system, the valve may be located at the inlet to the liquid separator and not the inlet to the second stage separator. In accordance with another aspect, which may be used with one or more of the other aspects disclosed herein, the floor cleaning apparatus may include a detachable cleaning unit 120 that includes a suction motor and at least one separator (optionally the entire treatment unit 130), such that the cleaning unit 120 can be operational as a cleaning apparatus when detached from the rest of the surface cleaning apparatus 100. These embodiments may enable a user to separate the cleaning unit 120 from other portions of the surface cleaning apparatus, such as the surface cleaning head, liquid delivery system, liquid collection container and the like, which may reduce the amount of weight the user has to carry. Optionally, the cleaning unit 120 may be operable in both wet and dry cleaning modes, or in only one of the modes. The modes the cleaning unit 120 can be operated in may depend on the nature of the treatment unit 130, and or individual separators 132 and 134 that are contained in, and removable with the cleaning unit 120. These embodiments having a detachable cleaning unit 120 may be used in combination with any of the other features and/or aspects of any of the dual stage treatment units, single stage treatment units, recline limiting and/or mode controlling apparatuses, liquid delivery systems, surface cleaning heads, apparatuses with openable fluid flow paths and/or above floor cleaning mode(s, and may also utilize features described in relation to embodiments of the hand held surface cleaning apparatuses. Referring to Referring to The lift away embodiments may use any of the above floor cleaning embodiments. Alternately, or in addition, the free end of the wand 125 (including the auxiliary dirty fluid inlet 104 Optionally, the embodiment of Referring to Referring to In accordance with another aspect, which may be used with one or more of the other aspects disclosed herein, the surface cleaning apparatus 100 may be configured as a hand held or hand held surface cleaning apparatus. Some embodiments of hand held surface cleaning apparatuses are illustrated in Referring to In this embodiment, the dirty fluid inlet 104 is provided at the front end of the surface cleaning apparatus 100, while the handle 386 is provided toward an opposing, rear end of the surface cleaning apparatus (to the right as illustrated in The front end of the apparatus includes an inlet passage that includes an inlet conduit 390, extending along an inlet flow axis 392. The inlet conduit 390 may include the dirty fluid inlet 104, and/or may be configured to be connected to the wand 125 and surface cleaning head 102. As exemplified, the inlet flow axis 392 may extend in the generally front/back direction, and is orthogonal to the cyclone axis 154. The top of the apparatus 100 can include the openable lid 194, which may be opened to provide simultaneous access to the cyclone chamber 142, solid collection chamber 144 and liquid collection container 148. An optional drain 297 may also be provided to assist with emptying the liquid collection container 148. Alternately, the separation unit and/or the collection chambers 144, 148 may be removable. In the embodiments shown in In the embodiment of In any embodiment, and preferably in a hand surface cleaning apparatus embodiment, to help prevent inhibit backflow from the treatment unit 130 into the suction motor, a blocking member, such as the valve 394 (which may be a one way valve such as a check valve) in Alternatively, as shown in the embodiment of Optionally, as shown in the embodiments of Hand Held Surface Cleaning Apparatus with Enlarged Liquid Collection Container Alternately or in addition to having a blocking member, a hand held apparatus may have a liquid collection reservoir with an overflow tank portion to store recovered liquid when the apparatus is inclined during use. Referring to The first, second and third portions 148 In this embodiment, if the hand held surface cleaning apparatus 100 is used in a floor cleaning mode, the front end will tend to be downward facing when in use. When the hand held surface cleaning apparatus 100 is used in this manner, the separated liquid may tend to collect primarily win the first portion 148 Optionally, the liquid collection container 148 can be configured so that the volumes of the first and third portions 148 In this embodiment, substantially all of the primary portion 148 Optionally, in addition to having a liquid collection container 148 that includes the first, second and third portions 148 Hand Held Surface Cleaning Apparatus with Liquid Delivery System Optionally, a surface cleaning apparatus 100 that is configured as a hand held surface cleaning apparatus may also include a liquid delivery system for delivering liquid to the surface to be cleaned. In such embodiments, the hand held cleaning apparatus may include any suitable liquid reservoir apparatus 162, delivery nozzle 164, actuator (such as a switch 448) and the like. For example, in the embodiment of In another embodiment, as shown in Any of the embodiments of the liquid delivery systems described herein may be used in combination with any of the hand held cleaning apparatuses described herein. In accordance with another aspect, which may be used with one or more of the other aspects disclosed herein, an apparatus 100 may include a recline limiter system that can be used in upright-style surface cleaning apparatuses to help limit degree of inclination of the upright section of the apparatus. These recline limiter systems may be used in combination with any of the other features and/or aspects of the surface cleaning apparatuses described herein, including any of the dual stage treatment units, single stage treatment units, liquid reservoir units, surface cleaning heads, apparatuses with openable fluid flow paths, above floor cleaning mode(s) and/or lift away configurations, and may also utilize features described in relation to embodiments of the hand held surface cleaning apparatuses. In upright embodiments, the treatment unit 130, and specifically the liquid collection container 148, may be provided on the movable, upright section 116 of the surface cleaning apparatus 100. In such embodiments, it may be desirable in some instances to limit how much the upright section 116 is inclined when the apparatus is in use, as the farther the upright section 116 is inclined the chances of unwanted liquid flowing back into the separator, and then to the suction motor, may increase, and/or the efficiency and functionality of the treatment unit 130 (including a cyclonic separator and/or a momentum separator or the like). Optionally, the desired degree of inclination may be based on the operating mode of the apparatus, and/or the presence or absence of liquid in the liquid collection container 148. For example, the upright section 116 may be permitted to recline to a first position when operating in a dry, vacuum mode, but may be limited to a smaller amount of recline to a second position when operating in a wet pick-up or extractor mode, or if liquid is being held in the liquid collection container 148. The recline limiter system may include mechanical components, electrically actuated components and a combination of both, including one or more blocking members that can be triggered/deployed to inhibit rearward inclination of the upright section 116 beyond a particular recline angle. The recline limiter system may be automatically controlled, for example based on the inclination or position of the upright section 116 or the presence of moisture, and/or may be manually engagable by a user. Referring to In this embodiment, the recline limiter system 330 includes a deployable blocking member in the form of a movable pin 334 that is mounted to the upright section 116 that can be inserted into a corresponding slot 336 on the surface cleaning head 102 (or the location of the pin 334 and slot 336 can be reversed). The pin 334 is biased using a suitable biasing mechanism, such as spring 338, such that when the upright section 116 reaches the predetermined recline angle 332, the pin 334 is aligned with and is extended into the slot 336 ( Referring to Alternatively, if the controller 340 determines that the apparatus 100 is operating in a dry, vacuum-only mode, (for example if the cleaning solution delivery system has not been actuated) the controller 340 may not activate the locking pin 334, thereby permitting further reclining of the upright section 116 (past the extractor mode recline limit angle). The liquid fill sensor may operate with the controller 340 to monitor the amount of liquid in the liquid collection container 148 and compare the current amount to a pre-determined recline liquid threshold amount. The controller 340 may then be operable to restrict the reclining of the upright section 116 if the liquid collection container 148 is filled to a level where backflow of the liquid may be likely—optionally, regardless of the current operating mode of the apparatus 100. As exemplified in Optionally, the recline limiter system 330 may also include a user feedback apparatus, such as a light, display screen, audible transducer or speaker and the like, to alert a user then the reclining of the upright section 116 has been limited, and optionally identifying the reason for such limitation. For example, the controller 340 in the embodiment of While some other operating components of the surface cleaning apparatus 100, such has the treatment unit 130, are shown schematically in While using a blocking member, such as pins 334, is one example of a mechanism that can be used to inhibit movement of the upright section, other embodiments of the recline limiter system 330 may include other types of limiting mechanisms. For example, the recline limiter system 330 may include intermeshing gears on the upright section 116 and surface cleaning head 102 that rotate with each other as the upright section 116 is reclined. The recline limiter system 330 may be able to lock or otherwise impede rotation of one at least one of the gears in response to a control signal (or physical actuator) to inhibit further rotation of the upright section 116 relative to the surface cleaning head 102. In other embodiments, the upright section 116 may include a rotor that rotates with the upright section 116, and the recline limiter system 330 may include caliper or other such apparatus that can be actuated to engage and prevent rotation of the rotor (e.g. a disc brake type system), thereby inhibiting movement of the upright section 116. In another embodiment, a rearwardly extending groove may be provided instead of a slot 336. Accordingly, the pin 334 may be deployed onto the groove as soon as a condition is detected which causes the pin 334 to be deployed. Alternately, the pin 334 may be deployed into a rearwardly extending groove at all times and only withdrawn from the groove if the controller 340 does not detect an incline limiting event as a user moves to recline the unit past the recline limit. Optionally, as an alternative to limiting the reclining of the upright section 116, or in addition thereto, the apparatus 100 may be configured so that its operating modes are restricted when the upright section 116 is in a given orientation or moves past a given orientation. For example, controller 340 may be configured to both detect and optionally control the operating mode of the apparatus 100, and/or automatically shut off the suction motor 124 to help prevent liquid damage to the suction motor 124 upon receipt of a signal. Optionally, the embodiments of The user feedback apparatus may be used to communicate this information to the user, and inform the user why the wet mode functionality is restricted or why the apparatus has switched off. It may also, optionally, prompt the user to raise the upright section 116 if the user would like to resume wet mode operations. In accordance with this aspect, an auto shut off system (which includes controller 340) can be configured so that the controller 340 will automatically turn off the suction motor 124 upon the occurrence of a recline limiting event (e.g., prior to the upright section 116 reclining to a positon at which recovered water contained in the liquid collection container 148 will flow back and enter the separator, e.g. cyclone chamber 142, or reach the suction motor 124). In some embodiments, such as a hand held apparatus, which may be mounted on a wand 125 as the embodiments shown in Optionally, it may also be desirable to limit the operation of the surface cleaning apparatus 100 when it is in a storage position (such as shown in If a recline limiting event has occurred, e.g., the hand held surface cleaning apparatus 100 has been used for wet cleaning (for example if a water detection signal has been produced by moisture sensor 342) the suction motor 124 may be automatically shut off when the upright section 116 reaches the predetermined recline angle 332 (e.g., when an inclination signal is issued by the inclination sensor 314). Alternatively, if a recline limiting event has not occurred (e.g., the hand held surface cleaning apparatus 100 has not been used for wet cleaning, for example if moisture has not been detected by moisture sensor 342) the hand held cleaning apparatus 100 may continue to operated when the upright section 116 reaches and/or passes the predetermined recline angle 332. In accordance with another aspect, which may be used with one or more of the other aspects disclosed herein, the surface cleaning apparatus 100 may include an onboard power supply, such as in the form of a battery pack 168 and can be operated as a cordless apparatus (see for example In order to enhance the operational time of an apparatus 100 when battery operated, the apparatus may be configured in one or more of the following ways. Optionally, the surface cleaning apparatus 100, and/or cleaning unit 120, can be arranged so that the suction motor housing 126 (containing the pre-motor filter 160, a pre-motor filter chamber 161 and suction motor 124) is immediately downstream from the treatment unit 130, meaning that there are no intervening structures or functional components of the surface cleaning apparatus 100 positioned in the fluid flow path between with cleaning unit 120 and motor housing 126, other than optionally one or more pre-motor filters. Optionally, the first separator 132 and second separator 134 may be arranged so that the second separator 134 is immediately downstream from the first separator 132, such that there are no intervening components in the fluid flow path between the first and second separators 132, 134. In some embodiments, such as, for example, the treatment unit 130 shown in Optionally, the first stage separator or a combined liquid and solid separator may be in the surface cleaning head. An advantage of such a design is that the water extracted from a surface need not be raised as high and this reduces the power required to operate the apparatus. Optionally, the cleaning unit 120 may be removably mounted to, e.g., the upright section. In such a case, the first stage momentum separator, which may be in the surface cleaning head (see for example Optionally, the wand and hose may only be used in an above floor cleaning mode. The choice of power supply for a given apparatus may be based on a variety of criteria, including suction motor size and power requirements, desired run time, desired portability, desired overall weight and the like. While some embodiments are illustrated with battery packs and others with electrical cords, it is understood that any of the embodiments described herein may be provided with a battery pack, a power cord or optionally both. What has been described above has been intended to be illustrative of the invention and non-limiting and it will be understood by persons skilled in the art that other variants and modifications may be made without departing from the scope of the invention as defined in the claims appended hereto. The scope of the claims should not be limited by the preferred embodiments and examples, but should be given the broadest interpretation consistent with the description as a whole. A surface cleaning apparatus, such as an extractor, has a separated liquid reservoir wherein the separated liquid reservoir includes a liquid sequestering member. 1. A surface cleaning apparatus comprising:
a) a fluid flow path extending from a dirty fluid inlet a clean air outlet, the fluid flow path including a separator and a suction motor; and, b) a separation stage comprising the separator and a separated liquid reservoir wherein the separated liquid reservoir includes a liquid sequestering member. 2. The surface cleaning apparatus of 3. The surface cleaning apparatus of 4. The surface cleaning apparatus of 5. The surface cleaning apparatus of 6. The surface cleaning apparatus of 7. The surface cleaning apparatus of 8. The surface cleaning apparatus of 9. The surface cleaning apparatus of 10. The surface cleaning apparatus of 11. A surface cleaning apparatus comprising:
a) a fluid flow path extending from a dirty fluid inlet a clean air outlet, the fluid flow path including a separator and a suction motor; and, b) a separation stage comprising the separator and a separated liquid reservoir wherein the separated liquid reservoir includes baffle members. 12. The surface cleaning apparatus of 13. The surface cleaning apparatus of 14. The surface cleaning apparatus of 15. The surface cleaning apparatus of 16. The surface cleaning apparatus of 17. The surface cleaning apparatus of 18. The surface cleaning apparatus of 19. The surface cleaning apparatus of 20. The surface cleaning apparatus of CROSS REFERENCE TO RELATED APPLICATIONS
FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION
SUMMARY OF THE INVENTION
DRAWINGS
DETAILED DESCRIPTION OF THE INVENTION
Description of a Surface Cleaning Apparatus
Solid and Liquid Collection Regions Emptyable Concurrently
Single Stage Treatment Unit
Remote Liquid Collection Container
Liquid Sequestering Member in the Liquid Collection Container
Movable Dirty Fluid Inlet
Operating Components in the Surface Cleaning Head
Applying a Cleaning Solution to at Least One Agitation Member
Removable Fluid Flow Path
Above Floor Cleaning Mode(s)
Lift Away
Hand Held Surface Cleaning Apparatus
Recline Limiter System
Mode Control System
On Board Power Supply
