This application claims priority under 35 U.S.C. §119 to German patent application no. DE 10 2010 030 598.7, filed Jun. 28, 2010 in Germany, the disclosure of which is incorporated herein by reference in its entirety.
BACKGROUND Hand tool protection devices for an angle grinding machine with a protective hood which delimits a reception region for a tool from a single axial direction and partially in the circumferential direction are already known.
SUMMARY The disclosure proceeds from a hand tool protection device with a protective hood which at least partially surrounds a reception region for a tool.
It is proposed that the hand tool protection device have at least one stabilizing bar which is arranged on the protective hood in at least one operationally ready state and which directly delimits the reception region at at least one point. A “tool” is to be understood in this context as meaning, in particular, a separating and/or grinding wheel. A “reception region for a tool” means, in particular a spatial region which to a maximum is occupied and/or swept by the tool in at least one operating state. A “protective hood” is to be understood as meaning, in particular, a unit which, particularly by virtue of its spatial arrangement between the tool and an operator, protects the latter from grinding constituents, such as, in particular, from a workpiece and/or the tool, and, if the tool bursts, from splinters. A “stabilizing bar” is to be understood, in particular, to mean a unit which deviates from a peripheral collar of the protective hood and which preferably extends in a bridge-like manner transversally from a first marginal region to a second marginal region of the protective hood, in particular on an underside of the protective hood. A “peripheral collar of the protective hood” is to be understood in this context as meaning, in particular, a margin of the protective hood which is bent round in the direction of the reception region of the tool. Furthermore, an “underside of the protective hood” is to be understood here and hereafter as meaning, in particular, a region of the protective hood which lies opposite, especially in parallel, to a top side of the protective hood, while a “top side of the protective hood” is to be understood as meaning, in particular, a region of the protective hood which has a covering wall and a coupling point for coupling to a hand-operated machine tool, and which, in the mounted state of the protective hood, is pierced at at least one point by a drive shaft for the tool and faces a drive unit of the hand-operated machine tool. The covering wall of the top side of the protective hood preferably has adjoining it in the direction of the underside a segment of a surface area. In an advantageous configuration, the stabilizing bar is stretched at least essentially parallel to the covering wall over the open underside of the protective hood, so that the tool can rotate contactlessly between the top side of the protective hood and the stabilizing bar. That the stabilizing bar is arranged “at least essentially parallel to the covering wall” is to be understood as meaning, in particular, that an angle between a straight line perpendicular to a main plane of extent of the covering wall of the protective hood and a straight line perpendicular to a main plane of extent of the stabilizing bar amounts to less than 20°, advantageously to less than 10° and especially advantageously to less than 5°. That a stabilizing bar “directly delimits the reception region at at least one point” is to be understood as meaning that, during at least one operationally ready state, there is no solid body located on an imaginary section between this point and at least one point of the reception region. The stabilizing bar is fastened, in particular, to a motor housing and/or to a gear housing and/or to the protective hood of the hand-operated machine tool. A dimension and/or position of the stabilizing bar may be different, depending on the type of protective hood and on machine and/or tool size. Furthermore, it is conceivable to use two or more such stabilizing bars. An especially rigid and lightweight protective hood, along with good access to the tool, can be achieved by means of an appropriate configuration.
In a further configuration, it is proposed that the hand tool protection device have at least one fastening unit, by means of which the stabilizing bar is fastened at at least one point on the protective hood in at least one operationally ready state. Preferably, the stabilizing bar is fastened to the protective hood at least at two spatially separate points. Various connection technologies appearing appropriate to a person skilled in the art may be envisaged, but, in particular, riveting, spot or seam welding, adhesive bonding, clamping and/or screwing. Preferably, a prefitting facility may be provided on the protective hood, so that retro fitting with a stabilizing bar according to the disclosure is possible. A particularly effective stabilization of the protective hood can be achieved by fastening to the protective hood. Especially when a continuously open underside of a protective hood is stiffened by means of a transversally running stabilizing bar, a collar of the protective hood can advantageously be protected against deformation, for example if a hand-operated machine tool inadvertently falls.
Moreover, it is proposed that the hand tool protection device have at least one fastening unit which is provided for fastening the stabilizing bar releasably to at least one component. Here and hereafter, “provided” is to be understood, in particular, as meaning specially designed and/or equipped. In this context, a “component” is to be understood, in particular, as meaning a motor housing, a gear housing and/or, advantageously, the protective hood of the hand-operated machine tool. Preferably, the stabilizing bar is fastened releasably without the use of a tool. Advantageously, the hand-operated machine tool has a securing mechanism which prevents operation when the stabilizing bar is released and/or removed. Good access to the tool can be achieved as a result of the releasable fastening, thus making it possible, in particular, to change a separating or grinding wheel simply and conveniently, the advantageous consequence of this being that it is possible to avoid neglecting an appropriate safety precaution.
Furthermore, it is proposed that the hand tool protection device have at least one bearing unit which is provided for mounting the stabilizing bar pivotably. Especially simple access to the reception region of the tool can thereby be achieved. Advantageously, the stabilizing bar is fastened inseparably to the bearing unit, and therefore, in particular, a loss of the stabilizing bar can be avoided.
Furthermore, it is proposed that the hand tool protection device have at least one bearing unit which is provided for mounting the stabilizing bar displaceably at least essentially along a main direction of extent of the stabilizing bar. The term “displaceably mounted” is to be understood, in particular, as meaning that the stabilizing bar is mounted with translational motion, in particular in order to be guided from an operating position into a position in which the tool can be removed from the reception region. Here and hereafter, a “main direction of extent” is to be understood, in particular, as meaning a direction of a longest extent between two marginal points of the stabilizing bar. A direction directed “at least essentially along a main direction of extent” is to be understood, in particular, as meaning a direction of which the deviation from the main direction of extent amounts to less than 30°, advantageously to less than 20° and especially advantageously to less than 10°. Simple and rapid access to the reception region of the tool can thereby be achieved.
In an advantageous form of the disclosure, it is proposed that the stabilizing bar at least partially surround the protective hood. That “the stabilizing bar at least partially surrounds the protective hood” is to be understood, in particular, as meaning that the stabilizing bar has at least one part region which covers and/or touches an outside, facing away from the reception region of the tool, of the protective hood. Especially high stabilization of the protective hood can thereby be achieved. Furthermore, an especially rigid connection between the protective hood and the stabilizing bar is made possible.
Furthermore, it is proposed that the stabilizing bar be contoured in a region in which it directly delimits the reception region. That “the stabilizing bar is contoured in a region in which it directly delimits the reception region” is to be understood, in particular, as meaning that at least one cross-sectional face of the stabilizing bar perpendicular and/or parallel to the main direction of extent of the latter is different, in a region in which the stabilizing bar directly delimits the reception region, from at least one single trapezoidal face, in particular a single parallelogram face and, in particular, a single rectangle face. The elasticity properties of the stabilizing bar can thereby be varied. Advantageously, the stabilizing bar is profiled and/or has one or more beads and/or one or more lowered margins, with the result that the rigidity of the stabilizing bar can advantageously be increased. If the stabilizing bar has perforations and/or cutouts, in particular on a marginal region, weight and material can be saved and/or elasticity of the stabilizing bar in the vicinity of the perforations and/or cutouts can advantageously be increased.
Advantageously, the hand tool protection device has at least one spring unit and/or magnet unit which is provided for fixing the stabilizing bar in at least one operationally ready state by means of spring force and/or magnetic force. Simple and convenient operability can therefore be achieved. Advantageously, a closing mechanism for fixing the stabilizing bar is closed by means of the spring unit and/or magnet unit. An especially simple and conveniently operable fixing mechanism for the stabilizing bar can thereby be achieved.
BRIEF DESCRIPTION OF THE DRAWINGS Further advantages may be gathered from the following drawing descriptions. Exemplary embodiments of the disclosure are illustrated in the drawings. The drawings, descriptions and claims contain numerous features in combination. A person skilled in the art will expediently also consider the features individually and combine them into expedient further combinations.
In the drawings:
FIG. 1 shows a hand-operated machine tool in the form of an angle grinder with a hand tool protection device according to the disclosure in a perspective view,
FIG. 2 shows the hand tool protection device from FIG. 1 in an individual illustration from below,
FIG. 3 shows a further hand tool protection device with a removable stabilizing bar from below,
FIG. 4 shows a further hand tool protection device with a clockwise pivotable stabilizing bar from below,
FIG. 5 shows a further hand tool protection device with a counterclockwise pivotable stabilizing bar from below,
FIG. 6 shows a further hand tool protection device with a stabilizing bar pivotable via a web in a perspective view,
FIG. 7 shows a further hand tool protection device with a pivotable stabilizing bar in a perspective view,
FIG. 8 shows a further hand tool protection device with a removable stabilizing bar which as far as possible surrounds a protective hood, in a perspective view,
FIG. 9 shows a further hand tool protection device with a removable stabilizing bar in a perspective view,
FIG. 10 shows a further hand tool protection device with a removable stabilizing bar in two perspective views,
FIG. 11 shows a further hand tool protection device with a stabilizing bar fixed by means of a snap fastening, in a perspective view,
FIG. 12 shows a further hand tool protection device with an alternative snap fastening in a perspective view,
FIG. 13 shows a further hand tool protection device with a pivotable stabilizing bar and with a spring unit in a perspective view,
FIG. 14 shows a further hand tool protection device with an alternative spring unit in a perspective view,
FIG. 15 shows a further hand tool protection device with a further alternative spring unit in a perspective view,
FIG. 16 shows a further hand tool protection device with a displaceable stabilizing bar and with a spring unit formed in one piece with the stabilizing bar, in a perspective view,
FIG. 17 shows a further hand tool protection device with a displaceable stabilizing bar and with a spring unit fastened to the stabilizing bar, in a perspective view,
FIG. 18 shows a further hand tool protection device with a displaceable stabilizing bar and with a spring unit fastened to a protective hood on both sides, in a perspective view,
FIG. 19 shows a further hand tool protection device with a displaceable stabilizing bar and with a spring unit fastened to a protective hood on one side, in a perspective view, and
FIG. 20 shows a hand tool protection device according to the disclosure with a removable stabilizing bar in a further configuration in a view from above and a view from below.
DETAILED DESCRIPTION FIG. 1 shows a hand-operated machine tool, more precisely an angle grinder 50a, in a perspective view obliquely from below. The angle grinder 50a comprises a motor housing 54a, which is designed in the form of an operating grip 52a, and a gear housing 56a which adjoins the motor housing 54a. The gear housing 56a has, on a driven side, an orifice 42a, through which an output shaft, not illustrated in any more detail, of a gear unit of the hand-operated machine tool is led and is provided for coupling to a tool, in particular to a separating or grinding wheel. Moreover, the angle grinder 50a comprises a hand tool protection device with a flat protective hood 10a which has a coupling point 46a to the gear housing 56a. Furthermore, the protective hood 10a comprises a part-disk-shaped covering wall 36a of a top side 44a of the protective hood 10a and also a surface area 40a which in a lower marginal region forms a radially inwardly bent collar 48a. The protective hood 10a partially surrounds a reception region 12a for the tool, not illustrated. A stabilizing bar 14a of the hand tool protection device, which stabilizing bar is fastened at each of its two opposite ends at a part region of the protective hood 10a runs parallel to the covering wall 36a on an underside 38a of the protective hood 10a (FIG. 2). In the present case, the stabilizing bar 14a consists of the same material as the protective hood 10a, specifically of sheet metal. The stabilizing bar 14a and the protective hood 10a are produced in a stamping and bending operation. It is also conceivable, however, to manufacture the stabilizing bar 14a from a material other than that of the protective hood 10a. The stabilizing bar 14a directly delimits the reception region 12a for the tool on a side of the reception region 12a which faces away from the covering wall 36a. For fixing the stabilizing bar 14a to the protective hood 10a, the hand tool protection device comprises fastening units 16a, 18a, the fastening unit 16a fastening the stabilizing bar 14a releaseably to the protective hood 10a. The fastening unit 16a comprises a locking pin 60a which is led through the stabilizing bar 14a and with a hammer head, not illustrated in any more detail, through a hole contour of the protective hood 10a and is rotated, in order to make a releasable positive connection between the locking pin 60a and the protective hood 10a. The hole contour is integrally formed on the surface area 40a of the protective hood 10a, a main plane of extent of the hole contour being parallel to the covering wall 36a of the protective hood 10a and touching a marginal region of the collar 48a of the protective hood 10a. The fastening unit 18a comprises a bearing bolt 62a which is connected fixedly to the stabilizing bar 14a and is mounted pivotably in the protective hood 10a. The bearing bolt 62a forms a bearing unit 24a which is provided for mounting the stabilizing bar 14a pivotably. After the locking pin 60a of the fastening unit 16a has been released by being rotated in a direction of rotation 66a, the stabilizing bar 14a can be pivoted about the bearing bolt 62a of the bearing unit 24a over the collar 48a of the protective hood 10a in the direction 68a in order to free the tool, not illustrated. For this purpose, slight raising of the stabilizing bar 14a at an end facing the fastening unit 16a and therefore elastic bending of the stabilizing bar 14a are necessary in order to draw the hammer head of the locking pin 60a out of the hole contour. On account of its elasticity, the stabilizing bar 14a returns to its initial position when the action of force upon its end facing the fastening unit 16a is cancelled. The locking pin 60a is connected captively to the stabilizing bar 14a, that may alternatively be designed as an individual part. Instead of a locking pin 60a with a hammer head, a rotary bayonet fastening, a one-sided hooked pin or any other mechanical closure which obeys the “keyhole principle” may likewise be envisaged. Furthermore, it is conceivable that the bearing bolt 62a is connected fixedly to the protective hood 10a and pivotably to the stabilizing bar 14a.
Alternative exemplary embodiments are illustrated in FIGS. 3 to 20. Components, features and functions which remain essentially the same are basically designated by the same reference symbols. However, to distinguish the exemplary embodiments, the letters a to s are added to the reference symbols of the exemplary embodiments. The following description is restricted essentially to the differences from the exemplary embodiment in FIGS. 1 and 2, and as regards components, features and functions which remain the same reference may be made to the description of the exemplary embodiment in FIGS. 1 and 2.
FIG. 3 shows a variation of the principle from FIG. 2. For the sakeg of greater clarity, a stabilizing bar 14b is shown here only incompletely. Instead of a bearing bolt, as in the previous exemplary embodiment, a further locking pin 60b with a hammer head is used here, thus making it possible to remove the stabilizing bar 14b. Especially advantageous access to a tool is thereby achieved. When the stabilizing bar 14b is fastened, the two locking pins 60b engage in each case with their hammer head in hole contours 64b and are rotated, so that the hammer heads, engaging behind the hole contours 64b, form a releasable connection between a protective hood 10b and the stabilizing bar 14b. The hole contours 64b, only one of which is shown in FIG. 3, are integrally formed on a surface area 40b of the protective hood 10b such that their main plane of extent is parallel to a covering wall 36b of the protective hood 10b, the main plane of extent touching a marginal region of the collar 48b of the protective hood 10b. Alternatively, only one locking pin 60b at a first end of the stabilizing bar 14b can also be used, there being provided at a second end, lying opposite the first end, of the stabilizing bar 14b a fixed form contour which is identical to a locking contour of a secured locking pin 60b. This form contour may be integrated, in particular integrally formed, in one piece at the second end of the stabilizing bar 14b or may be mounted subsequently. In order to remove the stabilizing bar 14b, a remaining locking pin 62b first has to be opened at the first end of the stabilizing bar 14b by being rotated, and then the stabilizing bar 14b has to be rotated into a position which makes it possible to disconnect the form contour from the hole contour 64b.
In a further design variant according to FIG. 4, a spring unit 32c of the hand tool protection device is provided for fixing a stabilizing bar 14c by spring force and for holding it in a closed position. The hand tool protection device has a bearing unit 24c which comprises a bearing bolt 62c fastened to the stabilizing bar 14c. The bearing bolt 62c is mounted pivotably on a top side, facing away from a reception region 12c, of a covering wall 36c of a protective hood 10c. The stabilizing bar 14c is prolonged, at a first end facing the bearing unit 24c, beyond a collar 48c and a surface area of the protective hood 10c, is bent round in the direction of the top side of the covering wall 36c and is led over an outside, facing away from the reception region 12c, of the surface area and over the top side of the covering wall 36c as far as the bearing unit 24c. In a viewing direction perpendicular to the covering wall 36c, the bearing unit 24c is offset with respect to the stabilizing bar 14c perpendicularly to a main direction of extent of the stabilizing bar 14c. At its second end, the stabilizing bar 14c is clamped under a hook 72c which engages over it and which is integrally formed in the collar 48c of the protective hood 10c. The spring unit 32c has a leg spring 100c which is provided for fixing the mounted stabilizing bar 14c under the hook 72c by means of spring force. For this purpose, the leg spring 100c is coiled with its screw-like middle piece around the bearing bolt 62c, a first leg 104c of the leg spring 100c being fastened to the covering wall 36c and a second leg 102c of the leg spring 100c being fastened to the stabilizing bar 14c. To release the stabilizing bar 14c, the latter first has to be pivoted counter to the spring force, that is to say counterclockwise in FIG. 4, so that the stabilizing bar 14c can be lifted with its second end over the hook 72c by being slightly bent. Thereupon, the stabilizing bar 14c can be pivoted with the assistance of spring force, that is to say clockwise in FIG. 4, over the collar 48c of the protective hook 10c and thereby be opened completely. Instead of the leg spring 100c, other spring types, but also a latching and/or other fixings for the stabilizing bar 14c, may also be envisaged in alternative configurations.
The design variant according to FIG. 5 differs from the version according to FIG. 4 in an offset bearing unit 24d and in a reversed pivoting direction for opening or closing a stabilizing bar 14d. A position of the bearing unit 24d is chosen particularly in light of construction space conditions, reasons for mounting or other circumstances.
In the embodiment illustrated in FIG. 6, a stabilizing bar 14e surrounds a protective hood 10e at two angled ends of the stabilizing bar 14e which are arranged along a main direction of extent of the stabilizing bar 14e. The hand tool protection device has a bearing unit 24e with a hinge 96e which is arranged on a surface area 40e of the protective hood 10e and which mounts the stabilizing bar 14e pivotably via a central web 76e perpendicular to the main direction of extent. The protective hood 10e undergoes further stiffening by means of the web 76e. The stabilizing bar 14e is fixed via two releasable fastening units 16e at the angled ends of the stabilizing bar 14e, only one fastening unit 16e being illustrated in FIG. 6. The angled ends of the stabilizing bar 14e engage over the surface area 40e of the protective hood 10e and there have spring-loaded fastenings 98e in the form of hinged lids. With the stabilizing bar 14e mounted, locking pins 60e integrally formed on the fastenings 98e engage positively into matching recesses of the surface area 40e. The stabilizing bar 14e is additionally held between hooks 72e, 74e integrally formed on the surface area 40e. The stabilizing bar 14e is opened in that the fastenings 98e are moved outward counter to spring force and the locking pins 60e are thus drawn out of the corresponding recesses in the surface area 40e of the protective hood 10e. Alternatively, securing by locking pin may also be implemented only at one of the angled ends of the stabilizing bar 14e. The locking pins 60e may also be fastened to the surface area 40e of the protective hood 10e, and the fastenings 98e may in each case have a corresponding recess.
In a further exemplary embodiment according to FIG. 7, a stabilizing bar 14f has a bearing unit 24f at a first of its two ends and a fastening unit, not illustrated in any more detail, at a second end. The fastening unit is provided for fastening the stabilizing bar 14f releasably, any fastening unit which seems appropriate to a person skilled in the art being conceivable. The bearing unit 24f comprises a hinge 96f, integrally formed on a collar 48f of the protective hood 10f, for pivoting the stabilizing bar 14f in a plane perpendicular to a covering wall 36f of the protective hood 10f.
In a solution according to FIG. 8, a stabilizing bar 14g surrounds a protective hood 10g, a collar 48g of the protective hood 10g being uninterrupted, thereby advantageously increasing the rigidity of the protective hood 10g. The two ends of the stabilizing bar 14g are in each case prolonged beyond the collar 48g, are bent round there in the direction of a covering wall 36g and then run along an outside, facing away from a reception region 12g, of a surface area 40g of the protective hood 10g as far as the covering wall 36g where the two ends of the stabilizing bar 14g are bent round anew so as then to run parallel to a top side, facing away from the reception region 12g, of the covering wall 36g. The stabilizing bar 14g is fixed to the top side of the covering wall 36g by means of fastening units 16g, 18g. The fastening units 16g, 18g in each case comprise rim holes, equipped with a thread 80g, 82g, in the covering wall 36g of the protective hood 10g, the said rim holes being provided for receiving screws which fasten the stabilizing bar 14g to the covering wall 36g from the top side of the covering wall 36g. To make assembly easier, long holes 78g open on one side are provided at both ends of the stabilizing bar 14g. It would be conceivable to optimize the fastening units 16g, 18g if in order to fix the stabilizing bar 14g, for example, a shouldered collar screw is used and a collar of the collar screw fits into a round hole integrally formed at a closed end of the long holes 78g of the stabilizing bar 14g. Joining by means of the long hole 78g can then take place easily, the coil of the coil screw positively preventing the stabilizing bar 14g from sliding out after the collar screw has been fixed. Furthermore, alternatively, a pivotable fastening of the stabilizing bar 14g by means of a one-sided bearing unit according to FIGS. 4 and 5 may also be used (not illustrated). In the design variant shown in FIG. 9, too, a stabilizing bar 14h surrounds a protective hood 10h, a collar 48h of the protective hood 10h also being interrupted here. The two ends of the stabilizing bar 14h are in each case prolonged beyond the collar 48h, are bent round there in the direction of a covering wall 36h and then run along an outside, facing away from a reception region 12h, of a surface area 40h of the protective hood 10h as far as fastening units 16h over half the distance between the collar 48h and covering wall 36h. Each fastening unit 16h comprises an outwardly drawn collar, provided with a thread 80h, on the surface area 40h. The collar fits positively into a round hole of a hole contour 64h which is provided at each of the two ends of the stabilizing bar 14h and is in the form of a long hole, open on one side, at the closed end of which the round hole is integrally formed. A screw 84h is provided for fixing the stabilizing bar 14h, thus making it possible to have an especially securely positioned connection. During installation, the slightly elastic stabilizing bar 14h is slipped with the round hole over the collar on the surface area 40h and is thereupon fixed by means of the screw 84h.
FIG. 10 shows a variation of the principle from FIG. 9 from two perspectives. In this variant, too, a collar 48i of a protective hood 10i is uninterrupted. A fastening unit 16i for a stabilizing bar 14i comprises here a thread 80i in a collar, drawn inward in the direction of a reception region 12i, on a surface area 40i of the protective hood 10i. The stabilizing bar 14i again has two ends which are prolonged beyond a collar 48i and are bent round in the direction of a covering wall 36i and which are in each case fixed, from a side facing away from the reception region 12i, to the thread 80i by means of a screw 84i. For this purpose, long holes 78i open on one side are again provided at the ends of the stabilizing bar 14i, a positive connection being achieved in each case by means of two hooks 72i which are integrally formed directly next to the long holes 78i and come to bear against a screw head of the screw 84i when the stabilizing bar 14i is being mounted. Additional hooks 74i on the surface area 40i of the protective hood 10i serve for securing an exact position and prevent a skewing of the stabilizing bar 14i.
In the design variant shown in FIG. 11, the two ends of a stabilizing bar 14j are in each case prolonged beyond a collar 48j of a protective hood 10j, are bent round there in the direction of a covering wall 36j and then run along an outside, facing away from a reception region 12j, of a surface area 40j of the protective hood 10j. In the region of the surface area 40j, the ends of the stabilizing bar 14j have in each case a part which is angled in the circumferential direction of the surface area 40j and which is provided for being pushed positively and in the circumferential direction into a corresponding shackle 88j. The shackles 88j are formed by pressed-out regions of the surface area 40j of the protective hood 10j. Alternatively, the shackles 88j may be produced in any way which seems appropriate to a person skilled in the art. They may, for example, be integrally formed, in particular slotted, and/or also put in place, in particular spot-welded, seam-welded, adhesively bonded and/or screwed. The stabilizing bar 14j is held in its position by fastenings 98j in the form of small elastic plates fastened to the surface area 40j. To free the stabilizing bar 14j, the small elastic plates of the fastening 98j have to be pressed inwardly counter to spring force for the surface area 40j under the stabilizing bar 14j which can then be drawn out of the shackles 88j. In an alternative embodiment, it is also conceivable that the small elastic plates have to be drawn outward in order to release the stabilizing bar 14j. There may also be only one fastening 98j provided at one of the two ends of the stabilizing bar 14j. Instead of the small elastic plates, it would also be conceivable to have for the fastenings 98j, for example, a toggle lever system which is fastened to the surface area 40j of the protective hood 10j on both sides of the stabilizing bar 14j and which secures the position of the stabilizing bar 14j by prestress (not illustrated).
In the variant shown in FIG. 12, the two ends of a stabilizing bar 14k are likewise prolonged beyond a collar 48k of a protective hood 10k, are bent round there in the direction of a covering wall 36k and then run perpendicularly to the covering wall 36k along an outside, facing away from a reception region 12k, of a surface area 40k of the protective hood 10k. The two ends of the stabilizing bar 14k are in each case inserted in a shackle 88k which, as in the embodiment according to FIG. 11, is likewise put in place and/or integrally formed. The stabilizing bar 14k has at each of its two ends a recess, into which, with the stabilizing bar 14k mounted, a locking pin 60k engages positively, the said locking pin being attached to a hinged lid 98k having spring securing means. To demount the system, the hinged lids 98k are drawn outward, with the result that the locking pins 60k are drawn out of the recesses of the stabilizing bar 14k and free the latter. Alternatively, one-sided securing in the stabilizing bar 14k by means of a locking pin 60k could also be envisaged.
FIGS. 13, 14 and 15 show in each case a stabilizing bar 14l; 14m; 14n which is mounted on a bearing unit 24l; 24m, 26m; 24n and which is pivotable in a direction 66l; 66m; 66n in a plane perpendicular to a covering wall 36l; 36m; 36n of a protective hood 10l; 10m; 10n. In this case, the stabilizing bar 14l; 14m; 14n in each case with its two ends surrounds a collar 48l; 48m; 48n and a surface area 40l; 40m; 40n of the protective hood 10l; 10m; 10n from an outside, facing away from a reception region 12l; 12m; 12n, of the surface area 40l; 40m; 40n. Each of the bearing units 24l; 24m, 26m; 24n has a bearing bolt 62l; 62m, 63m; 62n which is fastened to the stabilizing bar 14l; 14m; 14n and which mounts the stabilizing bar 14l; 14m; 14n on the surface area 40l; 40m; 40n of the protective hood 10l; 10m; 10n. The embodiments according to FIGS. 13, 14 and 15 differ essentially in a spring unit 32l; 32m; 32n which fixes the stabilizing bar 14l; 14m; 14n in its position in a mounted state. In the embodiment according to FIG. 13, the spring unit 32l comprises a fastening 98l in the form of a spring-loaded lever displaceable in the circumferential direction 68l of the surface area 40l. When the stabilizing bar 14l is in a mounted state, a locking pin connected in one piece to the lever engages positively into a groove 92l cut out on the stabilizing bar 14l. To free the stabilizing bar 14l, the lever has to be displaced counter to spring force along the circumferential direction 68l so that the locking pin is drawn out of the groove 92l. A spring unit 32l for each side is expedient, but it will also be possible to have one-sided operation. In the embodiment according to FIG. 14, the spring unit 32m comprises long holes 78m in the surface area 40m of the protective hood 10m, in which long holes the bearing bolts 62m, 63m of the bearing unit 24m, 26m can be displaced counter to spring force in a direction 68m parallel to the covering wall 36m. The complete stabilizing bar 14m is thus mounted displaceably. The two ends of the stabilizing bar 14m which are arranged on the outside of the surface area 40m have in each case a groove 92m, into which a locking pin 60m integrally formed on the surface area 40m fits positively. In order to free the stabilizing bar 14m, the entire stabilizing bar 14m has to be displaced counter to spring force along the long holes 78m, so that the groove 92m frees the locking pin 60m, thus making it possible for the stabilizing bar 14m to be pivoted. To generate the spring force, spring elements are provided in the long holes 78m and are compressed when the stabilizing bar 14m is displaced. Alternatively, spring-loaded securing, latching or other securing against unwanted displacement may also be envisaged (not illustrated). In the embodiment according to FIG. 15, the spring unit 32n comprises on both sides a fastening 98n in the form of a sprung lever configured in one piece with the stabilizing bar 14n and having an integrated locking pin 60n which fits into a corresponding recess in the surface area 40n of the protective hood 10n. On pulling the lever counter to spring force, the locking pin 60n located on the stabilizing bar 14n is unlatched, in a direction 68n perpendicular to a surface of the surface area 40n at the location of the recess, out of the corresponding recess and thus frees the stabilizing bar 14n. The spring force required is achieved via the elastic stabilizing bar 14n itself Furthermore, it is conceivable that the spring force is generated via additionally attached spring elements (not illustrated). Furthermore, the stabilizing bar 14n may be installed rigidly and the locking pin 60n installed so as to be loaded with spring pressure, so that the locking pin 60n itself, presupposing that it has, for example, a rounded or sloped tip, can act in the same way as a ball-latching element (not illustrated). This ball-latching element may be attached both to the stabilizing bar 14n and to the surface area 14n of the protective hood 10n. Moreover, latching may also be provided only on one side. Alternatively, the locking pin 60n may also be provided on the surface area 40n, the fastening 98n having a corresponding recess for positive connection.
FIG. 16 shows a further embodiment of the disclosure. The stabilizing bar 14o consists of a planar basic body. The hand tool protection device has two bearing units 28o, 30o which are provided for mounting the stabilizing bar 14o displaceably along a main direction of extent of the stabilizing bar 14o. The bearing units 28o, 30o in each case comprise a hole contour 64o integrally formed on a collar 48o of a protective hood 10o and taking the form of a slot. The two slots of the two bearing units 28o, 30o are arranged on the collar 48o on opposite sides of the protective hood 10o, in a mounted state the stabilizing bar 14o being stretched transversely over a reception region 12o and being mounted in the two slots. In order to prevent the stabilizing bar 14o from slipping out, hooks 72o are formed at a first end of the stabilizing bar 14o and widen a cross-sectional face of the stabilizing bar 14o at this point. At a second end of the stabilizing bar 14o, the latter is forked and likewise has hooks 74o there. The stabilizing bar 14o is therefore contoured in a region in which it directly delimits the reception region 12o. By the stabilizing bar 14o being forked at its second end, a spring element 32o is formed which is provided for fixing the stabilizing bar 14o in its position in the mounted state. For mounting the stabilizing bar 14o, the latter is introduced with the fork in front, in a direction parallel to its main direction of extent, into the first slot of the first bearing 30o. For this purpose, the fork must be compressed slightly at the end of the stabilizing bar 14o, so that the stabilizing bar 14o fits, together with the hook 74o, through the slot. As soon as the hooks 74o have passed through the first slot, the fork returns to its initial position and the stabilizing bar 14o can be pushed transversely over the reception region 12o until the hooks 74o stand at the second slot of the second bearing unit 28o. The fork has to be slightly compressed anew here, so that the stabilizing bar 14o, together with the hooks 74o, can also pass through this second slot. An insertion depth of the stabilizing bar 14o is limited by the hooks 72o which with a marginal region of the first slot of the first bearing unit 30o form a stop. When this position is reached, the hooks 74o on the fork of the stabilizing bar 14o have also just passed through the second slot and the fork has returned to its initial position. The stabilizing bar 14o is consequently fixed securely between the two bearing units 28o, 30o. In an alternative embodiment, instead of the hooks 72o, embossing, a bead, a notching hammer blow, as it may be referred to, and/or an additional element, such as a bolt, may also be provided in order to define the insertion depth.
FIG. 17 shows a principle similar to that of FIG. 16, a stabilizing bar 14p having no fork here. The stabilizing bar 14p is held in two bearing units 28p, 30p which are provided for mounting the stabilizing bar 14p displaceably along a main direction of extent 66p of the stabilizing bar 14p. The bearing units 28p, 30p in each case comprise a hole contour 64p integrally formed on a collar 48p of a protective hood 10p and taking the form of a slot. The two slots of the two bearing units 28p, 30p are arranged on opposite sides of the collar 48p, in a mounted state the stabilizing bar 14p being stretched transversely over a reception region 12p and being mounted in the two slots. At a first end of the stabilizing bar 14p, a spring unit 32p is fastened, which is in the form of a flat helical spring which is wound around the stabilizing bar 14p and is supported, on the one side, on hooks 74p formed on the stabilizing bar 14p and, on the other side, on a margin of the slot of the bearing unit 30p. Furthermore, the stabilizing bar 14p has, at its second end lying opposite the helical spring, a further pair of hooks 72p which, together with a marginal region of the slots of the bearing unit 28p, form a stop when the stabilizing bar 14p is in a mounted state. It is possible to extract the stabilizing bar 14p by means of a sequence of three movements. In a first step, the stabilizing bar 14p is pushed counter to spring force of the helical spring along the main direction of extent 66p, so that the second end of the stabilizing bar 14p slides out of the slot of the bearing unit 28p. The hooks 74p form a stop for this pushing movement. In a second step, the second end of the stabilizing bar 14p is moved in a direction 70p perpendicular to a covering wall 36p of the protective hood 10p, until the second end of the stabilizing bar 14p is located above the bearing unit 28p, as seen in the direction 70p. In the third and last step, the stabilizing bar 14p is simply drawn out of the slot of the bearing unit 30p in the direction 68p. In an alternative embodiment, instead of the hooks 72p, 74p, any contour widening, in particular embossing, a bead, a notching hammer blow, as it may be referred to, and/or an additional element, such as a bolt, which locally enlarges a cross section of the stabilizing bar 14p, may be envisaged.
In a further embodiment of the disclosure according to FIG. 18, a flat stabilizing bar 14q, which has narrower stepped ends at its two ends, is held in two bearing units 28q, 30q which are provided for mounting the stabilizing bar 14q displaceably along a main direction of extent 68p of the stabilizing bar 14q. The bearing units 28q, 30q in each case comprise a hole contour 64q, 65q integrally formed on a collar 48q of a protective hood 10p and taking the form of a slot with a stepped marginal contour, a first region, facing a covering wall 36q, of the slot being longer than a second region facing away from the covering wall 36q and arranged centrally with respect to the first region. The two slots of the two bearing units 28q, 30q are arranged on the collar 48q on opposite sides of the protective hood 10p, in a mounted state the stabilizing bar 14q being stretched transversely over a reception region 12q and being fixed in the two bearing units 28q, 30q. In this case, two spring units 32q, 34q press, with wire yoke springs fastened to a surface area 40q of the protective hood 10q, the stabilizing bar 14q away from the covering wall 36q in a direction opposite to the direction 66q, so that the narrower stepped ends of the stabilizing bar 14q in each case engage positively into the second region of the hole contours 64q, 65q. To free the stabilizing bar 14q, the latter has to be pressed in the direction 66q of the covering wall 36q counter to spring force of the wire yoke springs, until the stepped ends of the stabilizing bar 14q are in each case located in the first region of the hole contours 64q, 65q. In this position, the stabilizing bar 14q can be pushed out of the hole contours 64q, 65q along its main direction of extent 68q and extracted. In an alternative embodiment, the spring units 32i, 32j may also have leaf springs, corrugated springs and/or any other suitable spring form. It is likewise conceivable that the fixing of the stabilizing bar 14q is achieved by pulling action instead of by pressing action, for example when spring elements are arranged on a side of the stabilizing bar 14q which faces away from the covering wall 36q.
An embodiment of the principle shown in FIG. 18, in which only one spring unit 32r is used, is shown in FIG. 19. Here, a flat stabilizing bar 14r is likewise mounted in two bearing units 28r, 30r, the bearing unit 30r corresponding in its configuration to the bearing unit 28q from FIG. 18 and the bearing unit 28r corresponding in its configuration to the bearing unit 30o from FIG. 16. An indentation located in both sides is provided, matching with a hole contour 65r of the bearing unit 30r, at a first end of the stabilizing bar 14r and can be inserted into the hole contour 65r. The other second end of the stabilizing bar 14r is mounted in the opposite hole contour 64q in the form of a slot. On the side of the bearing unit 30r, the spring unit 32r is provided, having a wire yoke spring which is fastened to a surface area 40r of a protective hood 10r and which presses the stabilizing bar 14r in a mounted state away from a covering wall 36r opposite to a direction 66r. By an indentation located on both sides on the stabilizing bar 14r engaging positively into the hole contour 65r, the stabilizing bar 14r is held securely in its position. To remove the stabilizing bar 14r, the latter has to be pressed on the side of the spring unit 32r in the direction 66r toward the covering wall 36r and subsequently has to be drawn out of the hole contours 64q, 65q along a main direction of extent 68r of the stabilizing bar 14r.
In a last embodiment of the disclosure according to FIG. 20, a stabilizing bar 14s bent round at its two ends in the direction of a covering wall 36s of a protective hood 10s engages vertically, past a reception region 12s, through slots in the covering wall 36s. The ends of the stabilizing bar 14s which project on a top side, facing away from the reception region 12s, of the covering wall 36s are contoured with hole contours 64s, 65s such that spring units 32s, 34s arranged on the top side of the covering wall 36s hold the stabilizing bar 14s in position by means of rotatably spring-loaded locking levers 98s, 99s. For this purpose, the locking levers 98s, 99s engage positively with hooks, not illustrated in any more detail, into the hole contours 64s, 65s. In an alternative embodiment, instead of hole contours 64s, 65s, projections, into which the hooks of the locking lever 98s, 99s engage, may also be provided at the ends of the stabilizing bar 14s. To generate spring force, all the technically expedient spring types may be envisaged. FIG. 20 illustrates helical springs as outwardly acting compression springs. Alternatively, tension spring systems or other spring types are also conceivable.
