Anordnung und Befestigungselement

The invention relates to an arrangement, comprising a built-in part and a carrier. Furthermore, the invention relates to a fastening element.

Various fastening means are known in the prior art, in order to interconnect two in particular plate-like elements. Here is to be addressed specifically to connecting means, the two panel-shaped elements allow a detachable connection.

Many connecting means are based thereon that a bolt that is, a substantially elongate, usually cylindrical part, by superimposed holes projects two plate-like elements. Over the bolt (directly or indirectly) from both sides of the compound is formed a contact with the surfaces of the plate-shaped members. In addition to these contacts the frictional connection takes place of the compound.

A simple example is the application of a screw, which is regarded as a bolt having a head and a thread. From one side the screw is introduced by two superposed holes in the plate-like elements, wherein the screw head forms the force fit with this side. On the other side of the compound as a counterpart and this nut is mounted a nut against the screw rotated in order to establish the connection. Screw and nut form a connecting means, to assist fitting access to both sides of the plate-shaped members required.

It should be here as an example mentioned as a further representative of the compounds disclosed in DE 1,194,643 connecting means, in which for mounting access from both sides of the connection is needed. Discharges of the bolt from the visible side of a first member with a head must take place, since the head of the bolt fits through the hole in the further component not, while on the second side of the compound, so to speak, rearwardly for further component, then further parts of the compound are to be mounted.

However, it is advantageous, when the mounting can take place from one side, e.g. then, when the access to the other side of an element is lasted. This is the case, for example, when at least one of the plate-shaped members is a pipe, wherein on the outer side of the tube, a further plate-shaped member is to be attached. Compounds, in which the mounting can take place from one side, are well known, often for the interaction of the connecting means on the side which case, the opposite the mounting face, a special version is provided.

As an example is the socket for receiving a connecting means is disclosed in DE 2,061,995, called. Also disclosed is a fastening device in DE 2,049,870, wherein a Dom comes to lie in a [...] of the bolt, the two parts together connects from one side is provided at the portion wherein this Dom that is with respect to the mounting face. In DE as a counterpart of the bolt-shaped connector 25 08,463 is provided a special metal strip, the forms a connection to the bolt via special openings with tabs.

The side, the opposite to the mounting side, not for the formation of the connection for the mentioned connection systems must be free, but at least for attaching such a version should the side, the opposite the mounting face, be freely accessible. If one of the plate-like members are a blocked element already, the introduction is often no longer possible a socket.

Instead of sockets or counterparts is also known from the prior art, specifically designed to provide holes in the plate-shaped elements, the serve for fixing and attaching the connecting means, the only be mounted from one installation.

The with regard to the present invention connecting means are, in which for the preparation of the compound a bolt is twisted along the connecting axis displaced and around these, wherein are attached to the bolt transverse struts, the form with one of the two by a spring force after the twisting force locking elements to be joined. To release compound is correspondingly vice versa.

EP 0,239,767 Bl and US 1,334,336 reveal a with spring-loaded Screw top. The pin is here guided by two superposed openings in the plates with its transverse struts and then twisted about the longitudinal axis of the bolt. A coiled helical spring is acted upon by a force about the pin lying for this. The spring presses against a first plate and then pulls (mediated by a supporting surface) simultaneously via the bolt to the transverse struts. The transverse struts, are on the other side of the connection through the twisting over the hole in the second plate with the second plate and a contact form also. A frictional connection is achieved by the spring force.

As another example of this principle is referred to as Bl 1,544,479 EP, wherein a connector for a rail slot is disclosed. The upper side can be regarded as a plate-shaped component of the rail I, the disclosed is accessible only from one side, with which a connector for mounting from one side 1,544,479 EP. It is an idea that is, however, no connection for a second plate-like member but provided generally for loads. During the special 1,544,479 [...] before rail slot provides for EP, as a hole with specific shape provided it is, then, the rail slot.

US 2, 599, 690 09,169 T2 207 and a rotary connector for metal plates and a reveal fast-removable Fastening device DE, specially shaped holes are provided in each of which, so as to allow the passage of the transverse struts of the bolt. The pin is rotated after passage so, by bearing on the plate with a spring-loaded transverse struts that, the form is situated opposite the mounting face, the force fit. The force fit on the mounting side is achieved in both cases by a spring. In US 2,599, with axially disposed slots formed as circles are the holes 207. The slots serve for the passage of the bolt but also the mounting face to the plate that the connecting means, the penetrating into the slot of the collar a dent is protected to pivot with respect to. In DE 690 09,169 T2 are holes in the plates with a first pair of diametrically opposite and at right angles thereto a second pair of oppositely-directed slots directed slots provided, wherein the first and second slots have each have a greater or smaller width than the transverse struts. In the second, smaller slots of the carrier plate come to lie after assembly from the rear side the transverse struts.

In the latter two devices is the substantial portion of the fastener after assembly inboard, i.e. not to see from the side, from which the mounting is effected. By contrast, the operation of the rotating mechanism is in EP 1,544,479 and EP 0,239,767 Bl by means of a to the mounting side lying housing provided for opening and closing, it works here as a control handle. In cases, where the solubility of the compound should not be obvious to the layman is to release, but only to the link mechanism familiar person skilled in the art the connecting means, an inner mechanism is advantageous.

If one of said plate-shaped members is a already blocked element, to serve as a carrier vehicle for the further plate-shaped element, then the retroactive introduction is also specifically shaped holes for the formation of suitable sockets or a compound made difficult or undesirable. In particular, the case can occur that in an already installed element, to which a plate-shaped element is to be mounted, already openings are present. In such cases the can in US 2,599, are regarded as disadvantageous shape of the holes and 207 690 09,169 T2 provided DE.

It is also disadvantageous in a collar of the housing US 2, 599, 207 and DE 690 09,169 T2, the projects as a projection on the mounting side. As of the side on which there is also apparent for the presence of the collar element of the connection elements located therebehind. These is unfavorable, when the connection means should not be understood, from the mounting side.

This collar serves the frictional connection of the coupling means with the plate, located on the mounting side. The collar is on the mounting side on the lead through the housing and the spring pressed strength-subjected lying plate. If the to the mounting side lying plate is mounted from the underside on a plate-like carrier, then this frictional connection may not be sufficient, so as to bear the weight of the plate. These is re-routed to specifically, when, as described in DE 690 09,169 T2, the housing and the collar are formed with a continuous slot.

Also the contact of the transverse struts for transmission of power to the rear side of the compound in the two documents is not advantageous for an arrangement, in which a plate is mounted to a support from below. In US 2,599, the interaction with the plate-like element 207 and form projecting parts of a round-bottom flask is formed with bevelled surfaces 690 09,169 T2 locking pawls in DE by the contact, the come to lie in narrower slots of the supporting member.

The invention therefore is to solve the task In the particular, to provide an arrangement or a fixing element, with which a module can be attached to a support, wherein the visible side remains substantially free of protrusions and projections once it has been assembled, whereby a substantially yields flat-even visible side.

The problem is solved by a

Arrangement, comprising a built-in part and a carrier,

wherein the insert

a module and

a fastening element,

including a holder, a bolt with cross-braces and has a spring element,

comprises,

wherein the fastening element can be fixed to the module via a connecting means releasably and

wherein the spring element is disposed between holder and bolt, so that the bolt is acted upon by spring force and is pressed against the module,

wherein the support has an opening, so that s the fastening element is insertable into the opening from one side of the installation part, so that the bolt can be arranged on the other side of the opening with transverse struts, and the module at the opening forms a stop,

wherein the bolt is pivotable relative to the holder and mounted for rotation of the bolt about its longitudinal axis has a engagement,

wherein the module has a recess, through which the bolt can be pivoted by a rotary member and preferably subsequently acted upon with force.

The arrangement permits the attachment of a module to a support. With this arrangement the invention problem is solved so The that the fastening by a form is quickly and quickly resolve turning pressing mechanism, wherein the bolt is prepared according to the pivoting the force fit with the carrier with transverse struts. A spring, which is acted upon with force compensates for works, has the effect, inter alia that the arrangement for carriers of different thickness, since the spring the thickness difference. The carrier are present for mounting the assembly in an installed condition can that is to say, it is enough, if the aperture in the carrier from one side is accessible. Advantageously the arrangement is also suitable for forming a connection then, when the module is mounted to the support from below. The arrangement serves to do this that a module depends on the carrier. The module is supported to depend on the female connecting element, advantageously also then, in the course of time, for example, if the spring force should maintain. The module comprises the article to be attached. There can comprise the module such as a lamp or a sensor. The module can send only the cover but also simply an aperture in the carrier as a task.

Module and fastener together form the insert, wherein the releasable fixing of the fastener takes place before mounting on the module. The Fastening element consists essentially of a bolt with transverse struts, a spring element and a holder. It is connected with the module in the course of a pre-assembly. For that the assembly comprising at least one connecting means, two preferably (for example screws) for releasably retaining a plurality of connecting means or. It is provided, so that the fastening element is fixed to the module that coincides with the longitudinal axis of the bolt of the fastener material a recess on the module. The recess on the module allows the passage with a tool.

The force-fitting fixing between module and fastening element has a number of benefits to a Built-in element. One this is conveniently located in the force distribution, and thus when the packing element is mounted from below to a carrier via the fastening means on the carrier depends on the module. To Another such a pre-assembly is for handling during installation (particularly in mounting overhead) practically, since only must be handled with a part. The pre-assembled fastening element, at the same time serve as a handle for the can also transport of the packing element, which is, particularly when it is a sensitive module, may be very practical.

The preassembled installation member in order to establish the connection to the carrier is introduced from one side into the opening of the carrier in a first step, i.e., said one side is the mounting face. according to invention the insert is so oriented that only shows the module against the mounting surface. The Fastening element comes to lie on the side opposite the mounting side. On the mounting side can, if appropriate, be recognisable parts of the connecting means on the module. But alone can be seen through the recess in the module the bolt. The pin has an engagement on at this point, the rotation of the bolt allows about its longitudinal axis, but which also allows that the spring element is acted upon with force between bolt and holder.

In the second step the insert is then mounted on the bolt by operating the turning pressing mechanism. The operation can take place exclusively via the recess in the module, i.e. from the mounting side. The engagement screw head drive formed is similar to a. The operation is advantageously carried out by a rotary member, i.e. the engagement is used that a tool, for example a screwdriver or key (e.g. hexagon socket, six approximately ) is attached, so as to push the bolt and to rotate. By pressing displaces the bolt relative to the other parts of the assembly away from the mounting side. The spring member from one side and is acted on by a force on the other side of the holder forms a counter force. Holder in turn remains stable over the connecting means of the holder on the module, which forms a stop to the mounting side at the opening of the carrier. The transverse struts come wholly behind the support by pressing. The rotating the bolt leads to a pivoting of the cross beams, its dimension is provided so that they project across the opening of the support in the rotated state. If the voltage at the spring element is released, a force acted upon contact between transverse struts and rear of the carrier itself forms from.

In embodiments the spring element is designed as a helical spring, wherein a bearing surface is provided on the holder, in which one end of the coil spring is located, and wherein the bolt has a pin, the is located on the pins relative to the engagement, and which at the other end of the coil spring over part of the length of the pin within the coil spring extends coil spring.

[...]turning pressing mechanisms for compounds are known for the training of. The helical spring is particularly suitable, for afford geometric arrangement of spring element according to the invention, holder and bolts in the fastening element. The coil spring with one end on the holder is on. The bearing surface on the holder is preferably constructed such that the helical spring is not off center. Furthermore, has also the advantage can serve a coil spring that to guide the bolt, the runs with a pin, within the coiling of said coil spring. The pin can be seen as an extension of the bolt in the longitudinal direction, wherein the diameter is smaller than the main body of the bolt preferably of the pin. Therefore the helical spring is located at the transition between the pin and main body of the bolt on a shoulder or on the transverse struts. Thus forms a part of the joint for the bolt and prevents the spring that the longitudinal axis of the bolt pivots with respect to the remaining securing member and the recess in the module, while rotation about the longitudinal axis is possible. The pin extends only over part of the length of the helical spring, so that it is still possible, by a force from the side of the engagement on the bolt to tension the spring in direction holder, i.e. so as to apply a force, without that the pin abuts on the holder.

Additional advantageous embodiments of the arrangement relate to the design of the bolt with transverse struts, wherein two transverse struts preferably are formed in two diametrically opposite directions from the pin.

The arrangement, in which two transverse struts face is especially suitable for the uniform power transmission. A plurality of transverse struts are also conceivable, of course. Two diametrically on ordered transverse struts have the advantage that it have a maximum extent in one direction only. To Be Fitted the direction with the maximum width of the the maximum extension advantageously falls together aperture in the carrier. After installation that is to say upon rotating the bolt with the transverse struts, extend the transverse struts then in another direction. according to invention the transverse struts are longer than the opening of the carrier in this direction then, so that the transverse struts, bridge the opening. The arrangement is therefore particularly suitable for openings in the carrier, the further and in a different direction are narrower in a direction, for example, slots.

Even is preferably an embodiment, wherein the rotation of the bolt about its longitudinal axis from a first position via the engagement is restricted to 90° by the holder.

Holder will therefore be a part of the pivot joint of the bolt. 90° to a rotation of about Restricting is advantageous for a number of reasons, particularly with long and short side at a rectangular opening. One is in the case of two opposing transverse struts so between the two position of the maximum difference in the lateral extension so perfectly reached and the aperture in the carrier can be bridged. To Another a restriction is the rotation also advantageously, because the operation of the rotating mechanism via the engagement is carried out blindly, and hence no visual control is possible from the mounting side. Since the holder forms a stop, have been rotated about 90° with respect to the first position when the transverse struts, overspeeding is prevented and to subsequently a further the return into said installed position. It is of course, rotation in both directions about the longitudinal axis of the bolt. A rotation is Preferably, , in which is rotated clockwise viewed from engagement on the bolt, so as to rotate the transverse struts 90° from its first position.

In can have further the transverse struts one foot each of the bolt, at the end of which a standing surface, the runs in the direction of one side shows, complementary to the plane of the support.

The surface of the feet of the transverse struts forms the bearing surface of the connecting element on the back of the support in the installed state. With this surface the connecting element is on the carrier. For a highest possible levels of frictional connection it is advantageous, if the contact surfaces as far as possible be a good match. The bases of the legs fit according to invention therefore, the direction show mounting side, together with the face of the support, on which they rest.

The pin can, for example, be designed that the cross struts are formed substantially at right angle to the longitudinal direction of the bolt. Of the transverse struts are oriented such in turn the feet, are aligned to be parallel to the bolt. The "soles" of the feet in the direction show mounting side. In flat-even surface formed as a planar carrier are also the soles, so that they come to rest in a form-fitting manner on the side of the support as far as possible is facing away from the mounting side.

In another aspect the arrangement can, be characterized that the holder so constructed that it is substantially arcuate formed, wherein the longitudinal axis of the bolt coincides with the apex of the holder.

Holder [...] of a sheet can be particularly suitable in the receive and fixed leather element and bolts on the module. Heat to [...] must not corresponding with the geometric Ideal of a sheet, but is particularly crucial that between an apex and two legs under the arch a vault, i.e. a cavity, results. leather element are disposed in this cavity and bolts in the arrangement according to the invention. The arc spanning leather element on two sides and in this arrangement the bolt and this further secures the in position against displacement. The [...] capable of functioning as a handle for the insert to be met by a substantially arcuate holder well, since this very well in the hand. By forming the holder as an arc arises a span, therefore a maximum distance of the legs. This span of the sheet is wider than the passage of the sheet is long according to the invention, to enable the holder has a main direction, the falls of sheet together with the span. This structure is advantageous, because so even the entire fastening means, such as the bolt with transverse struts, for elongated openings in the support is particularly suitable.

Furthermore, can be an embodiment with a curved retainer characterized, so that the bolt is mounted in the holder, in a first position substantially parallel to the holder that the cross struts come to rest within said holder

The thus defined first position is the position, in which the transverse struts for installation are present. The arcuate holder surrounds so that not only the bolt and the spring element but also the folded transverse struts. Holder-specifically the bend-tightness-curve -is formed adapted, to receive the transverse struts, optionally with their feet. In this position, the transverse struts are advantageously protected before rupture. Even [...]bend-tightness-curve of the holder by the decreases of the cross beams in the the volume of the fastener, which in turn is [...] and practically for transport. Within for example, as part of the holder can be retracted walls of the arch, the allow accumulation of the transverse struts of the bolt in a substantially parallel position a. At the same time, the twist over 90° walls can prevent this, in which they form a stop for the respective other transverse strut.

The inventive arrangement can be further characterized in that a respective connection means on each arm of the arcuate holder is arranged for fixing the fastening means to the module.

As already described the unit of the packing element is, therefore the composite of fastener and granted module is mounted in the at least one connecting means. In a specific embodiment two such connecting means provided are, for an optimal distribution of the forces, are mounted respectively on the legs of an arcuate holder. During connection of the holder with the module will thus enclosed, the spring element and the bolt within the sheet. Connecting means are preferably screws, for the appropriate thread for a form-fitting connection in the holder and are formed in the module. Alternatively, for the connection means also be provided as a counterpart thread by a nut. Particularly are preferably so mounted the connecting means that it not from the side of the module from the task of identifying them. The pre-assembly of the packing element occurs, thus from the side, the lies behind the module after installation into the carrier. The connecting means for mounting or dismounting of the packing element must no longer be actuated, this takes place solely via the engagement on the bolt.

Also The invention pertains to a fastening element, comprising a holder, a bolt with crossbars and a spring member,

wherein the bolt is pivotable relative to the holder and mounted for rotation of the bolt about its longitudinal axis has a engagement,

wherein the spring element is disposed between holder and bolt, so that the bolt is acted upon by spring force,

wherein the spring element preferably designed as a helical spring,

wherein the bolt has a pin, the is located on the pins relative to the engagement, and which pin extends over a part of the length of the coil spring within the coil spring, and

wherein the holder has at least one device for introducing a connecting means.

A inventive fastener is used, together with a built-in part to form a module. Advantageous embodiments concerning the arrangement may also be advantageous for the fastening element:

Thus in one embodiment is the fastener, characterized in that two transverse struts are formed in two diametrically opposite directions from the pin.

Even is preferably that rotation of the bolt about its longitudinal axis from a first position via the engagement is^{restricted by said retainer on 90} 0.

Furthermore is the fastening element, characterized in that the transverse struts each have a foot, at the end of which extends a standing surface, the points in the direction in which the engagement for rotating on the bolt exhibits.

Holder of the fastener can be constructed substantially arcuate, wherein the longitudinal axis of the bolt coincides with the apex of the holder and on each arm of the holder is in each case a device for introducing a connecting means.

In one embodiment is provided, so that the bolt is mounted in the holder that the cross members in a first position substantially parallel to the holder within the [...] come to rest of the holder.

practical way the fastener (n) in a unit with the/n connecting means can and a are provided being attached plate. The being attached plate such a unit, the cohesion can grant of the fastening element, in which it occupies a position equivalent to the module, i.e. the anchoring point for the connecting means and the bolt presses against the spring element forms. Such a unit is suitable for the direct handling of the fastener in the pre-assembly operation that is, fixing module and fastening element. The being attached plate can, if it has a recess for the engagement of the bolt along the lines of the module, and for the connecting means is continuous, also be installed to the installation part in the invention arrangement. It such a holder and bolt on one side and the module being attached plate is located between on the other side. being attached plateaccording to invention the area is smaller than the opening of the support and corresponds to such a approximately to the base surface of the holder. The being attached plate allows the use of one and the same variable thickness of the fastener on carriers, the differ in the depth of the opening.

The inventive arrangement according to the invention is represented and the fastening means in In the following on the basis of preferred embodiments as examples schematic Figures.

Fig. 1

Fig. 2

3 a or b Fig.

4 a or b Fig.

an exploded view shows an arrangement according to the invention, an exploded view shows a according to the invention by a narrow side installation part.

a side view show a horizons in retracted form or the deployed shape appropriate to assembly with transverse struts.

a supervision arrangement according to the invention show a from the side, opposite to the mounting side of the side on which lies or from.

The Figure 1 shows an inventive arrangement In Detail 1, wherein a support 2 is present, to which a module is fixed 3. 1, for example, can be provided in the arrangement that the module carries on its underside 3 built-in damping agent, are to be mounted on a support 2. In the mapped arrangement is provided that the mounting of the module 2 takes place from the bottom to the support 3. A point of view is shown obliquely from above, however, to map the relative orientation of the individual components. The essential components of the arrangement come to lie on the side, opposite the mounting face which lies, i.e. here above the carrier 2.

The fastening means then consists of three essential parts: holder 4,5 and 6 with bolts 5 has two transverse struts. The pin transverse struts on and is spring element otherwise substantially cylindrical. On a base surface of the bolt 5 has indicated engagement 7, which here, but better in Fig. 4 is recognizable. The engagement directly above a recess 8 in the module 3 for lie 7 comes, so that the operation, by means of a tool, for example by means of a hex key 8 can take place through the recess. In addition to the large proportion of the module 3 is In the illustration, the comes to lie in the opening 2 on the carrier 9, also a small proportion of the module to see 3, the forms there a stop on the lower side via the opening 9 and projects. The opening 9 is, in the shown example, rectangular design, wherein the one side is substantially longer than the other. There is therefore almost the form of a slot. according to invention is from below through the opening 13 to form the arrangement the fastening means 9 wherein the bolt is guided in this case so arranged with transverse struts 5 that the cross struts extend parallel of the longer side of the opening. Only by operating the engagement 7, i.e. rotating the bolt, the bolt comes to lie in the shown orientation with transverse struts 5, so that the transverse struts 9 extend over the sides of the opening. The 2 against the carrier by the transverse struts 6 of the spring element the power press, during 3 the compound forms from the other side of the stop of the module.

The spring member 6 is designed as a helical spring in this embodiment. Your one end is in excess of a pin 5 on the bolt 10, which is opposed to the engagement pin 7 10. The holder 4 is formed as a sheet and the spring element 6 lies with its other end at the apex of this sheet. By pressure on the engagement 7, i.e. according to the representation from below, the spring element 6 is subjected to force.

The 11 and 11 are two transverse struts of the bolt by feet ' characterized, in the direction of the support 12 whose sole or standing surface 2 shows, i.e. in the picture plane downwardly. Here the support base 11 as well as the bearing surface at the carrier 12 is of the feet 2 designed so as to be flat. It force transmission be obtained by the complementary contact a good.

Holder 4, bolt 5, and 6 together form the fastening element 13 is 13. spring element according to the invention fixed on the module 3 first fastener The, 2 is formed before the connection to the carrier. For the pre-assembly of the holder 3 is fixed to the module 13 over with the aid of the connecting means 4. In Figure two connecting means 14 are represented, the are located symmetrically on the legs of the sheet. The holder 4 also has notches, so that the connecting means 4 and the holder 14 are countersunk so particularly advantageous as a handle is available.

In Figure 2 is represented a inventive Built-in element 15. 3. the fastening element 13 and the module 15 comprises a Built-in element can be prepared for installation Component The, a releasable fixing is made in the via the connecting means 14. Figure 2 is, in addition, there is a 16 represented being attached plate, these can have substantially the same shape as the opening 9, but must fit into the opening 9, i.e. be less. according to invention the disc 16 is therefore not necessarily round, but advantageously rectangular and Know further comprises a passage 8 in the module 7 in the bolt and recess on the between engagement comes to rest. Furthermore, 14 provided are holes for the connecting means. Even before mounting on the module 3, the components are assembled to form a unit 2 shown in Figure 17 can. This permits the assembly of the fastener 13 and the application of force to the spring element 16 between bolt 5 and 6 with the aid of the holder 4 being attached plate.

Figure 3a shows an arrangement, as it is present during the assembly operation. The Built-in element 15 is introduced from below into the opening 2, wherein the bolt 5 with transverse struts in a first position, wherein the lateral supports within said holder 4 come to rest is arranged. The shape of the holder 4 allows the complete receiving the bolt 11 to the transverse struts with their feet. In this position the upper part is so narrow as the holder 15 of the packing element and can easily be inserted into an opening 9 to a carrier so 2. Also it is advantageous that the cross struts owner sheet come to rest under the, so that they are protected and unlike other link mechanisms with free-standing transverse struts or pawls can not Cancel. Figure 3b differs from Figure 3a with transverse struts solely by the arrangement of the bolt 5, which comes to lie in the second position in Figure 3b, i.e. 90° rotated. The on the side walls of the retainer to propose transverse struts. In this view a foot is To view with its support surface 2 rests positively on the support 11. The spring member 6 is hard to see by the design of the holder 4, what indicates by the arcuate support facing external effect moreover, for the protection of the spring.

Figures 4 a and b show views from above or from below to the arrangement, the arrangement has been mounted from below, so that Figure 4b shows a view of the side on which. During on the upper side (4a Fig.), the holder 14 and the cross-members of the bolt 4 and the connecting means 5 be identified, the mounting side is almost free of references to a connecting element. The obstructed module 3 is to identify and closes from below the opening 2 in the support 9 (Fig. 4b). The 14 are in this arrangement from the underside to detect connection means. From located behind the connecting means 14 is to recognize only the engagement 7 in the bottom view. He is offset behind the recess 8 in the module 3, where it is protected, and only the well-informed person skilled in the art for the presence of the points located behind the connecting means. Nevertheless, solely by the release of the connection is a quick and simple possible recess. For that is operated via the engagement 7 turning pressing mechanism of (in this example with a spanner), whereby the bolt 4 assumes again the first position within the holder 5 and the packing element 9 in the carrier 15 can be removed from the opening 2 as all.