TOOL WITH LEVEL

TOOL WITH LEVEL Field 9f the Invention This invention relates to hand tools. Back round of the Invention My Canadian Patent No. 1,221,806 issued March 19, 1987 relates to a hammer that has separate vertical and horizontal levels for levelling in two dimensions. That hammer has a right angle in the bottom edge to form a square. When the hammer head and the square portion were placed against a right angle, two level vials could be observed to determine horizontal and vertical levelling. There is a need for tools with a level which will provide levelling along three mutually orthogonal coordinate axes, a level which can be incorporated into several different tools. Surnm.ary of he Invention_ Accordingly the invention features a hand tool which has a level for indicating levelling along three mutually orthogonal coordinate axes. The level is a single level device that has a rectangular or cubic periphery. The level device is preferably mounted on the handle and has two opposed slightly domed portions, one of which extends outwardly relative the handle and the other of which, extends or faces inwardly relative to the handle. On the domed portion facing outwardly, (first domed portion), are external markings for indicating which direction is the proper level direction. There is a circular central mark and sets of marks that are parallel to each other and perpendicular to other sets of marks along the sides of the level device. The sets of parallel marks define areas that indicate levelling along two of the axes and the centrat circular marking indicates levelling along a third axis. The hand tool can be a hammer, such as a masml's hammer or a claw hammer, a utility knife., or some other hand held tool, such as a screwdriver or carpenter's square, providing the tool is configured in relation to the level device to provide sets of orthogonal level surfaces. The invention also pertains to a hand tool comprising a handle and a single rectangular level mounted to the handle for levelling in first, second and third mutually orthogonal axes, the level having a container for holding a liquid with a bubble, wherein the container has a rectangular periphery and a central CA 02202451 1997-04-11 portion so that the bubble moves to the periphery when levelling in the first and second axes and to the central portion for levelling along the third axis. The invention also pertains to a levelling device comprising a container having a sealed inner cavity with domed upper and lower surfaces and four side edges forming a rectangle, the container holding fluid having a bubble therein and the outside of at least the upper surface having level indicating markings thereon adjacent the sides and at the center of the surface. CA 02202451 19ç7-04-11 Brief Description of the D rawinqs Other features and advantages will be apparent from the following description of preferred embodiments when read in conjunction with the following drawings in which: FIGURE 1 is a side view of a tool, namely a hammer, in a vertically, levelling position. FIGURE 2 is an enlarged view of the level unit of the invention taken about line 2 - 2 of FIGURE 1. FIGURE 3 is a sectional view of the level unit taken elong line 3 - 3 of FIGURE 2. FIGURE 4 is a side view of the tool of FIGURE 1 in a horizontal levelling position. FIGURE 5 is an enlarged view of the level unit of the invention taken about line 5 - 5 of FIGURE 4. FIGURE 6 is a sectional view of the level unit taken along line 6 - 6 of FIGURE FIGURE 7 is a top plan view of a surface with the tool of FIGURE 1 lying on a surface. FIGURE 8 is a side view of the tool shown in FIGURE 7 lying on the surface (horizontal. FIGURE 9 is an enlarged view of the level device taken about line 9 - 9 of FIGURE 7. FIGURE 10 is • sectional view of the level device taken along line - 10 of FIGURE 8. FIGURE 1 1 is a view of the tool of FIGURE 1 against an overhead surface. FIGURE 1 2 is an enlarged view of the level device taken about Iìne 1212of FIGURE 11. FIGURE 13 is a sectional view taken along line 13 - 1 3 of FIGURE 12. FIGURES 14 - 18 are views of a different tool, namely a utility knife with a level device, the knife shown in different positions on various surfaces, namely, FIGURE 14 being a plan view; FIGURE 15 being a side elevational view; FIGURE 16 being an end view and on a vertical surface in FIGURE 17 and on a horizonal surface in FIGURE 18. FIGURES 19, 20 and 21 illustrate views of a screwdriver configured for use with a level device of the invention, FIGURE 19 being a plan view, FIGURE being a side view and FIGURE 21 being a sectional view taken along line 21 - 21 of FIGURE FIGURE 22 shows in section the construction of one embodiment of the level device. FIGURE 23 shows in section an alternate construction of the level device. FIGURE 24 illustrates an alternative embodiment of the level device of cubic configuration. FIGURE 25 is a sectional view taken along line 25 - 25 of FIGURE 24. Description of Preferred Embodiment Referring to FIGURES 1, 4, 7, and 11, a hand tool, such as a mason's hammer, has a handle 32 with head 34 at one end thereof. Handle 32 may be of any suitable material and a three dimensional level device 36 is mounted within a square recess 40 in handle 32. As particularly shown in FIGURES 2, 3; 5, 6; 9, 10 and 12; 13, level device 36 has a container portion 42 with a domed sealed transparent cover 44 and concaved domed inner surface 46 containing a liquid 48 and a "bubble" 50, the bubble 50 being air, another gP.% or a liquid of a different specific gravity from liquid 48. The general technique of using a bubble in a liquid for levelling is well known. Level device 36 is mounted within handle recess 40 and is affixed therein with an epoxy adhesive or the like 52. A fluorescent colouring 54 can be placed on the bottom surface of level day!ca 16 (or on the bottom of recess 40) for better visibility of the bubb1 e 50. Level device 36 also has markings for assisting the user to determine levelling. The markings delineate a central bullseye section .=;hown with a centered circle 56. Side markings include opposed pairs of lines 58 and opposed pairs of lines 60 which respectively extend inwardly from each side CA 02202451 1997-04-1! and are perpendicular to the associated side. Referring to FIGURES 1 and 4, hammer 30 is shown in orthogonal vertical and horizontal positions respectively. At the bottom or free end 62 of handle 32, there is a right angle portion 64 defined by surfaces 66 and 68 allowing the handle 32 to be used as a square. If the hammer is placed in either the horizontal or vertical directions against a workpiece, such as a vertical stud 70 (FIGURE 1) or horizontal joist 72 (FIGURE 4), it serves as a levelling means. More particularly when hammer 30 is against a surface such as stud 70 or joist 72, part of the right angle portion 64, namely surface 66 cooperates with at least a part 74 of the anvil portion 76 of head 32 to provide a levelling means. In the use embodiments shown in FIGURES 1 and 4, bubble 50 moves into or rises to the line markings 60 or 58 associated respectively with level side 80 in FIGURE 2 (vertical) and level side 82 in FIGURE (horizontal). It will be apparent that the orientation of level device 36 in the handle recess 40 must be such that one side 80 of the recessed level device is planar or parallel with the plane of surface 66 and anvil part 74. (In other words, angles e in FIGURE 1 are equal.) If the surface against which the hammer is held is not level or vertical, then the bubble 50 will tend to move to the higher corner of the level device 36, out of the marking lines 58 or With reference to FIGURES 7, 8, 9 and 10, hammer 30 can be laid fiat against an object, such as a board, schematically shown in FIGURES 7 and 8 as 84. With the side surface 86 of hammer head 32 constructed te be planar with the side 88 of handle 32, the hammer in this position may also serve as a level, bubble 50 rising to the central bullseye portion 56. This position or direction of the hammer is orthogonal to both the horizontal and vertical directions shown in FIGURES 1 and 4. As noted previously, handle 32 and head 34 are designed and constructed so that they cooperate to provide planar surfaces 86, 88 which will enable level device 36, using the bullseye portion 56, to confirm the level of a top surface against which the hammer lies such as the board 84, or a cinder block (nêt shown). It will of course be appreciated that the bottom surface of container portion 42 of level device 36 must be parallel with the plane of surfaces 86. 88 of the hammer La glhw 431 I l'g4"]l Similarly as shown in FIGURES 110 12 and 13, the levelling tool can be used to check the level of a surface above ones head, such as the level of a board or stud schematicall'! shown as 90. The bubble 50 in this use, locates itself at the back 46 of the level device 36 but can be seen from the front. Levefiing is achieved using the bullseye section 56 of the markings. The three dimensional levelling aspect of the hammer is useful when one wants to level an item, such as a board or cinder block, while viewing from the top or check the level of an object or board above one's head or sight line. By having the bullseye section as part of the level device 36, a user does not need to look from the side. This is particularly useful, for example, if the board or block is in the ground or near the ground, when one might otherwise have to put one's head against or near the ground to de.e nine if the block was level by using my prior art hammer with level arrangement. Similarly it enables a person to check '=,vels above the sight line without having to use a !adder or other like device in order to have the level within a right line. Referring to FIGURES 14 - 18, a three dimensional square bubble level device 36 can also be incorporated in other tools, such as a utility knife A top view, a side elevational view and a rear end view are shown in FIGURES 14, 15 and 16 respectively. Utility knife 100 has a handle portion 102 and a blade 104 at a forward end thereof. As with hammer 30, knife handle 102 of the utility knife 1 O0 is designed and constructed so that various surfaces 110, 112 and 114 are orthogonally at right angles to each other. These surfaces are then either planar wit the surface 120 or 122 of workpiece 130 when placed fiat, vertically or horizontally against the wcí p õce 130 as shown in FIGURES 1 5, 17 and 18 respectively. More particularly, the rear or back surface 112 is et 90° to bottom surface 110 and both are at 90° with side surface 114. The use of the knife as a level is apparent from the drawings. Although FIGURE 14 illustrates the use of the knife level device lying on a surface 120, it can also be considered to illustrate a knife level device being held to an overhead surface. FIGURES 19 - 20 illustrate a level device 36 in cooperation with a screwdriver 140. Level device 36 is associated with recess 142 in the handle 144, the handle being designed and constructed such that it has at least two sides 146 and 148 with portions perpendicular to each other. Handle side 146 is planar with the bottom 150 of level device 36 whereas handle side 148 is planar with the adjacent side 152 of level device 36. Preferably, ail four sides of the handle are at right angles to each other. The level device is preferably mounted forward of the middle of the handle to lessen contact by a user's hand. It will be apparent however that the level may be placed within the handle without any portion contactable by the user's hand. Applicant has found that rectangular, preferably square level devices with a domed top and bottom surface, are more accurate and less prone to damage than a circular level device. In a representative embodiment, a level device 36 is about 1.9 - 2.0 cm a side (0.75 inches) and about 0.64 cm (0.25 inches) in height. Because the level device is relatively thin, it cen be incorporated into the tools as noted herein or other tools such as a carpenter's square having a handle element. FIGURES 22 and 23 show different constructions of square bubble levels 160 an 180. In FIGURE 21, a clear plastic housing 162 (inverted) is molded and a plastic molded plug 164 is adapted to fit tightly within housing 162. It will be noted that the cavity 166 inside of the plastic housing 162 is slightly invertedly domed at 168 and the plug has a slightly domed depression 170. Housing 162 is filled with liquid to a selected level and plug 164 is secured peripherally by suitable glue within housing 162 containing the liquid. The depression 170 in the plug 164 creates an air space forming the desired bubble when the device is inverted. FIGURE 23 shows a variation in the formation of a level device, namely square bubble level 180. The lower cup portion 182 has a bottom surface tapered slightly to a depression 184 with tapering walls 186, ] 88 both inside and out thereby facilitating molding. The upper cup upper portion 190 has corresponding inner tapered sides 192 and a slightly domed central indentation 194 on the inner surface. Liquid is placed in lower cup portion 182 to level 195 and when the tapered cup portions 182 and 190 are peripherally secured together by glue or the like, a bubble is formed in the liquid. In this embodiment, there are shown peripherally spaced lock fins 200 which enhance the grasp of the sides of the level with the sides of the recess formed in the handle or the like of a tool. Turning to FIGURES 24 and 25, I have shown a cubic level device 210 which can be secured into a rectangular through opening in the handle of a tool (not shown) and used to check the level of various surfaces including overhead surfaces. The level device 210 is constructed similar to the rectangular level 180 in FIGURE 23. More particularly, open ended housing 212 has a semispherical recess 214 and upper cover portion 216 has shoulder 218 which is peripherally secured by glue to the open ended housing 212. The inside recess 220 of cover portion 216 is also specifically configured. Liquid is placed in housing 212 to a selected level 224 so that when cover portion 214 i glued in place, the liquid is forced upwardly but leaves a bubble 22G at the top. The lever of FIGURES 24 and 25 may be mounted within a through aperture in a tool, such as the handle of a hammer or the like so that the level may be viewed from either side regardless of which hand of the user (left handed user) is to hold the tool The cavity in level device 210 is shown as spherical but it will be appreciated that each inner side of the cavity could be more domed-shaped in the fashion of the opposed inner surfaces of the thin rectangular level device 36. Other variations in the construction and molding of the bubble are possible and applicant claims ail modifications and variations falling within the appended claim s. CA 02202451 1997-04-11 The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows: 1. A hand tool comprising: a handle portion having first and second oppositely facing faces; and a level r c, "nted on the handle portion for levelling the tool along first, second and third mutuelly orthogonal axes, the level having a container for holding a fiuid having a bubble therein, the container having a rectangular inner periphery, with domed upper and lower surfaces, the level capable of indicating levelling when the tool is positioned along the first and st cond axes and said container havino « central portion for indicating levelling along the third axis, wherein the le,, : connected to thé, handle adjacent the first face, wherein the tool is designed so that when the tool is positioned so that the second face is against a workpiece, the òubble in the level moves to the central portion for indicating levelling. 2. The tool of claim 1, wherein the handle of the tool has three mutually orthogonal surfaces, wherein for each combination of adjacent faces, the handle forms a right angle with a workpiece when the tool is positioned against the workpiece so that the handle squares in three directions. 3. The tool of claim 2, wherein the level has markings including a centrally Located circle and at least one set of parallel lines extending inward from and centered with an outer side periphery of the container, the parallel lines for defining a region that indicates levelling along one of the first and second axes. 4. The tool of claim 1, 2 or 3, wherein the container has a domed central portion. The tool of claim 1, 2 or 3, wherein the tool ís a hammer. The tool of claim 1, 2 or 3, wherein the tool is a utility knife. - 9