US20110318999A1

US20110318999A1 - Hand Tool Protection Device

Info

Publication number: US20110318999A1
Application number: US13/169,352
Authority: US
Inventors: Cornelius Boeck; Joachim Schadow; Rainer Vollmer; Sinisa Andrasic; Gerhard Kraemer
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2010-06-28
Filing date: 2011-06-27
Publication date: 2011-12-29
Also published as: DE102010030598A1

Abstract

A hand tool protection device with a protective hood which at least partially surrounds a reception region for a tool is disclosed. The hand tool protection device has 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.

Description

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 50 a, in a perspective view obliquely from below. The angle grinder 50 a comprises a motor housing 54 a, which is designed in the form of an operating grip 52 a, and a gear housing 56 a which adjoins the motor housing 54 a. The gear housing 56 a has, on a driven side, an orifice 42 a, 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 50 a comprises a hand tool protection device with a flat protective hood 10 a which has a coupling point 46 a to the gear housing 56 a. Furthermore, the protective hood 10 a comprises a part-disk-shaped covering wall 36 a of a top side 44 a of the protective hood 10 a and also a surface area 40 a which in a lower marginal region forms a radially inwardly bent collar 48 a. The protective hood 10 a partially surrounds a reception region 12 a for the tool, not illustrated. A stabilizing bar 14 a 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 10 a runs parallel to the covering wall 36 a on an underside 38 a of the protective hood 10 a (FIG. 2). In the present case, the stabilizing bar 14 a consists of the same material as the protective hood 10 a, specifically of sheet metal. The stabilizing bar 14 a and the protective hood 10 a are produced in a stamping and bending operation. It is also conceivable, however, to manufacture the stabilizing bar 14 a from a material other than that of the protective hood 10 a. The stabilizing bar 14 a directly delimits the reception region 12 a for the tool on a side of the reception region 12 a which faces away from the covering wall 36 a. For fixing the stabilizing bar 14 a to the protective hood 10 a, the hand tool protection device comprises fastening units 16 a, 18 a, the fastening unit 16 a fastening the stabilizing bar 14 a releaseably to the protective hood 10 a. The fastening unit 16 a comprises a locking pin 60 a which is led through the stabilizing bar 14 a and with a hammer head, not illustrated in any more detail, through a hole contour of the protective hood 10 a and is rotated, in order to make a releasable positive connection between the locking pin 60 a and the protective hood 10 a. The hole contour is integrally formed on the surface area 40 a of the protective hood 10 a, a main plane of extent of the hole contour being parallel to the covering wall 36 a of the protective hood 10 a and touching a marginal region of the collar 48 a of the protective hood 10 a. The fastening unit 18 a comprises a bearing bolt 62 a which is connected fixedly to the stabilizing bar 14 a and is mounted pivotably in the protective hood 10 a. The bearing bolt 62 a forms a bearing unit 24 a which is provided for mounting the stabilizing bar 14 a pivotably. After the locking pin 60 a of the fastening unit 16 a has been released by being rotated in a direction of rotation 66 a, the stabilizing bar 14 a can be pivoted about the bearing bolt 62 a of the bearing unit 24 a over the collar 48 a of the protective hood 10 a in the direction 68 a in order to free the tool, not illustrated. For this purpose, slight raising of the stabilizing bar 14 a at an end facing the fastening unit 16 a and therefore elastic bending of the stabilizing bar 14 a are necessary in order to draw the hammer head of the locking pin 60 a out of the hole contour. On account of its elasticity, the stabilizing bar 14 a returns to its initial position when the action of force upon its end facing the fastening unit 16 a is cancelled. The locking pin 60 a is connected captively to the stabilizing bar 14 a, that may alternatively be designed as an individual part. Instead of a locking pin 60 a 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 62 a is connected fixedly to the protective hood 10 a and pivotably to the stabilizing bar 14 a.
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 14 b is shown here only incompletely. Instead of a bearing bolt, as in the previous exemplary embodiment, a further locking pin 60 b with a hammer head is used here, thus making it possible to remove the stabilizing bar 14 b. Especially advantageous access to a tool is thereby achieved. When the stabilizing bar 14 b is fastened, the two locking pins 60 b engage in each case with their hammer head in hole contours 64 b and are rotated, so that the hammer heads, engaging behind the hole contours 64 b, form a releasable connection between a protective hood 10 b and the stabilizing bar 14 b. The hole contours 64 b, only one of which is shown in FIG. 3, are integrally formed on a surface area 40 b of the protective hood 10 b such that their main plane of extent is parallel to a covering wall 36 b of the protective hood 10 b, the main plane of extent touching a marginal region of the collar 48 b of the protective hood 10 b. Alternatively, only one locking pin 60 b at a first end of the stabilizing bar 14 b can also be used, there being provided at a second end, lying opposite the first end, of the stabilizing bar 14 b a fixed form contour which is identical to a locking contour of a secured locking pin 60 b. This form contour may be integrated, in particular integrally formed, in one piece at the second end of the stabilizing bar 14 b or may be mounted subsequently. In order to remove the stabilizing bar 14 b, a remaining locking pin 62 b first has to be opened at the first end of the stabilizing bar 14 b by being rotated, and then the stabilizing bar 14 b has to be rotated into a position which makes it possible to disconnect the form contour from the hole contour 64 b.
In a further design variant according to FIG. 4, a spring unit 32 c of the hand tool protection device is provided for fixing a stabilizing bar 14 c by spring force and for holding it in a closed position. The hand tool protection device has a bearing unit 24 c which comprises a bearing bolt 62 c fastened to the stabilizing bar 14 c. The bearing bolt 62 c is mounted pivotably on a top side, facing away from a reception region 12 c, of a covering wall 36 c of a protective hood 10 c. The stabilizing bar 14 c is prolonged, at a first end facing the bearing unit 24 c, beyond a collar 48 c and a surface area of the protective hood 10 c, is bent round in the direction of the top side of the covering wall 36 c and is led over an outside, facing away from the reception region 12 c, of the surface area and over the top side of the covering wall 36 c as far as the bearing unit 24 c. In a viewing direction perpendicular to the covering wall 36 c, the bearing unit 24 c is offset with respect to the stabilizing bar 14 c perpendicularly to a main direction of extent of the stabilizing bar 14 c. At its second end, the stabilizing bar 14 c is clamped under a hook 72 c which engages over it and which is integrally formed in the collar 48 c of the protective hood 10 c. The spring unit 32 c has a leg spring 100 c which is provided for fixing the mounted stabilizing bar 14 c under the hook 72 c by means of spring force. For this purpose, the leg spring 100 c is coiled with its screw-like middle piece around the bearing bolt 62 c, a first leg 104 c of the leg spring 100 c being fastened to the covering wall 36 c and a second leg 102 c of the leg spring 100 c being fastened to the stabilizing bar 14 c. To release the stabilizing bar 14 c, 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 14 c can be lifted with its second end over the hook 72 c by being slightly bent. Thereupon, the stabilizing bar 14 c can be pivoted with the assistance of spring force, that is to say clockwise in FIG. 4, over the collar 48 c of the protective hook 10 c and thereby be opened completely. Instead of the leg spring 100 c, other spring types, but also a latching and/or other fixings for the stabilizing bar 14 c, 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 24 d and in a reversed pivoting direction for opening or closing a stabilizing bar 14 d. A position of the bearing unit 24 d 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 14 e surrounds a protective hood 10 e at two angled ends of the stabilizing bar 14 e which are arranged along a main direction of extent of the stabilizing bar 14 e. The hand tool protection device has a bearing unit 24 e with a hinge 96 e which is arranged on a surface area 40 e of the protective hood 10 e and which mounts the stabilizing bar 14 e pivotably via a central web 76 e perpendicular to the main direction of extent. The protective hood 10 e undergoes further stiffening by means of the web 76 e. The stabilizing bar 14 e is fixed via two releasable fastening units 16 e at the angled ends of the stabilizing bar 14 e, only one fastening unit 16 e being illustrated in FIG. 6. The angled ends of the stabilizing bar 14 e engage over the surface area 40 e of the protective hood 10 e and there have spring-loaded fastenings 98 e in the form of hinged lids. With the stabilizing bar 14 e mounted, locking pins 60 e integrally formed on the fastenings 98 e engage positively into matching recesses of the surface area 40 e. The stabilizing bar 14 e is additionally held between hooks 72 e, 74 e integrally formed on the surface area 40 e. The stabilizing bar 14 e is opened in that the fastenings 98 e are moved outward counter to spring force and the locking pins 60 e are thus drawn out of the corresponding recesses in the surface area 40 e of the protective hood 10 e. Alternatively, securing by locking pin may also be implemented only at one of the angled ends of the stabilizing bar 14 e. The locking pins 60 e may also be fastened to the surface area 40 e of the protective hood 10 e, and the fastenings 98 e may in each case have a corresponding recess.
In a further exemplary embodiment according to FIG. 7, a stabilizing bar 14 f has a bearing unit 24 f 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 14 f releasably, any fastening unit which seems appropriate to a person skilled in the art being conceivable. The bearing unit 24 f comprises a hinge 96 f, integrally formed on a collar 48 f of the protective hood 10 f, for pivoting the stabilizing bar 14 f in a plane perpendicular to a covering wall 36 f of the protective hood 10 f.
In a solution according to FIG. 8, a stabilizing bar 14 g surrounds a protective hood 10 g, a collar 48 g of the protective hood 10 g being uninterrupted, thereby advantageously increasing the rigidity of the protective hood 10 g. The two ends of the stabilizing bar 14 g are in each case prolonged beyond the collar 48 g, are bent round there in the direction of a covering wall 36 g and then run along an outside, facing away from a reception region 12 g, of a surface area 40 g of the protective hood 10 g as far as the covering wall 36 g where the two ends of the stabilizing bar 14 g are bent round anew so as then to run parallel to a top side, facing away from the reception region 12 g, of the covering wall 36 g. The stabilizing bar 14 g is fixed to the top side of the covering wall 36 g by means of fastening units 16 g, 18 g. The fastening units 16 g, 18 g in each case comprise rim holes, equipped with a thread 80 g, 82 g, in the covering wall 36 g of the protective hood 10 g, the said rim holes being provided for receiving screws which fasten the stabilizing bar 14 g to the covering wall 36 g from the top side of the covering wall 36 g. To make assembly easier, long holes 78 g open on one side are provided at both ends of the stabilizing bar 14 g. It would be conceivable to optimize the fastening units 16 g, 18 g if in order to fix the stabilizing bar 14 g, 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 78 g of the stabilizing bar 14 g. Joining by means of the long hole 78 g can then take place easily, the coil of the coil screw positively preventing the stabilizing bar 14 g from sliding out after the collar screw has been fixed. Furthermore, alternatively, a pivotable fastening of the stabilizing bar 14 g 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 14 h surrounds a protective hood 10 h, a collar 48 h of the protective hood 10 h also being interrupted here. The two ends of the stabilizing bar 14 h are in each case prolonged beyond the collar 48 h, are bent round there in the direction of a covering wall 36 h and then run along an outside, facing away from a reception region 12 h, of a surface area 40 h of the protective hood 10 h as far as fastening units 16 h over half the distance between the collar 48 h and covering wall 36 h. Each fastening unit 16 h comprises an outwardly drawn collar, provided with a thread 80 h, on the surface area 40 h. The collar fits positively into a round hole of a hole contour 64 h which is provided at each of the two ends of the stabilizing bar 14 h 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 84 h is provided for fixing the stabilizing bar 14 h, thus making it possible to have an especially securely positioned connection. During installation, the slightly elastic stabilizing bar 14 h is slipped with the round hole over the collar on the surface area 40 h and is thereupon fixed by means of the screw 84 h.
FIG. 10 shows a variation of the principle from FIG. 9 from two perspectives. In this variant, too, a collar 48 i of a protective hood 10 i is uninterrupted. A fastening unit 16 i for a stabilizing bar 14 i comprises here a thread 80 i in a collar, drawn inward in the direction of a reception region 12 i, on a surface area 40 i of the protective hood 10 i. The stabilizing bar 14 i again has two ends which are prolonged beyond a collar 48 i and are bent round in the direction of a covering wall 36 i and which are in each case fixed, from a side facing away from the reception region 12 i, to the thread 80 i by means of a screw 84 i. For this purpose, long holes 78 i open on one side are again provided at the ends of the stabilizing bar 14 i, a positive connection being achieved in each case by means of two hooks 72 i which are integrally formed directly next to the long holes 78 i and come to bear against a screw head of the screw 84 i when the stabilizing bar 14 i is being mounted. Additional hooks 74 i on the surface area 40 i of the protective hood 10 i serve for securing an exact position and prevent a skewing of the stabilizing bar 14 i.
In the design variant shown in FIG. 11, the two ends of a stabilizing bar 14 j are in each case prolonged beyond a collar 48 j of a protective hood 10 j, are bent round there in the direction of a covering wall 36 j and then run along an outside, facing away from a reception region 12 j, of a surface area 40 j of the protective hood 10 j. In the region of the surface area 40 j, the ends of the stabilizing bar 14 j have in each case a part which is angled in the circumferential direction of the surface area 40 j and which is provided for being pushed positively and in the circumferential direction into a corresponding shackle 88 j. The shackles 88 j are formed by pressed-out regions of the surface area 40 j of the protective hood 10 j. Alternatively, the shackles 88 j 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 14 j is held in its position by fastenings 98 j in the form of small elastic plates fastened to the surface area 40 j. To free the stabilizing bar 14j, the small elastic plates of the fastening 98 j have to be pressed inwardly counter to spring force for the surface area 40 j under the stabilizing bar 14 j which can then be drawn out of the shackles 88 j. 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 14 j. There may also be only one fastening 98 j provided at one of the two ends of the stabilizing bar 14 j. Instead of the small elastic plates, it would also be conceivable to have for the fastenings 98 j, for example, a toggle lever system which is fastened to the surface area 40 j of the protective hood 10 j on both sides of the stabilizing bar 14 j and which secures the position of the stabilizing bar 14 j by prestress (not illustrated).
In the variant shown in FIG. 12, the two ends of a stabilizing bar 14 k are likewise prolonged beyond a collar 48 k of a protective hood 10 k, are bent round there in the direction of a covering wall 36 k and then run perpendicularly to the covering wall 36 k along an outside, facing away from a reception region 12 k, of a surface area 40 k of the protective hood 10 k. The two ends of the stabilizing bar 14 k are in each case inserted in a shackle 88 k which, as in the embodiment according to FIG. 11, is likewise put in place and/or integrally formed. The stabilizing bar 14 k has at each of its two ends a recess, into which, with the stabilizing bar 14 k mounted, a locking pin 60 k engages positively, the said locking pin being attached to a hinged lid 98 k having spring securing means. To demount the system, the hinged lids 98 k are drawn outward, with the result that the locking pins 60 k are drawn out of the recesses of the stabilizing bar 14 k and free the latter. Alternatively, one-sided securing in the stabilizing bar 14 k by means of a locking pin 60 k could also be envisaged.
FIGS. 13, 14 and 15 show in each case a stabilizing bar 14 l; 14 m; 14 n which is mounted on a bearing unit 24 l; 24 m, 26 m; 24 n and which is pivotable in a direction 66 l; 66 m; 66 n in a plane perpendicular to a covering wall 36 l; 36 m; 36 n of a protective hood 10 l; 10 m; 10 n. In this case, the stabilizing bar 14 l; 14 m; 14 n in each case with its two ends surrounds a collar 48 l; 48 m; 48 n and a surface area 40 l; 40 m; 40 n of the protective hood 10 l; 10 m; 10 n from an outside, facing away from a reception region 12 l; 12 m; 12 n, of the surface area 40 l; 40 m; 40 n. Each of the bearing units 24 l; 24 m, 26 m; 24 n has a bearing bolt 62 l; 62 m, 63 m; 62 n which is fastened to the stabilizing bar 14 l; 14 m; 14 n and which mounts the stabilizing bar 14 l; 14 m; 14 n on the surface area 40 l; 40 m; 40 n of the protective hood 10 l; 10 m; 10 n. The embodiments according to FIGS. 13, 14 and 15 differ essentially in a spring unit 32 l; 32 m; 32 n which fixes the stabilizing bar 14 l; 14 m; 14 n in its position in a mounted state. In the embodiment according to FIG. 13, the spring unit 32 l comprises a fastening 98 l in the form of a spring-loaded lever displaceable in the circumferential direction 68 l of the surface area 40 l. When the stabilizing bar 14 l is in a mounted state, a locking pin connected in one piece to the lever engages positively into a groove 92 l cut out on the stabilizing bar 14 l. To free the stabilizing bar 14 l, the lever has to be displaced counter to spring force along the circumferential direction 68 l so that the locking pin is drawn out of the groove 92 l. A spring unit 32 l 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 32 m comprises long holes 78 m in the surface area 40 m of the protective hood 10 m, in which long holes the bearing bolts 62 m, 63 m of the bearing unit 24 m, 26 m can be displaced counter to spring force in a direction 68 m parallel to the covering wall 36 m. The complete stabilizing bar 14 m is thus mounted displaceably. The two ends of the stabilizing bar 14 m which are arranged on the outside of the surface area 40 m have in each case a groove 92 m, into which a locking pin 60 m integrally formed on the surface area 40 m fits positively. In order to free the stabilizing bar 14 m, the entire stabilizing bar 14 m has to be displaced counter to spring force along the long holes 78 m, so that the groove 92 m frees the locking pin 60 m, thus making it possible for the stabilizing bar 14 m to be pivoted. To generate the spring force, spring elements are provided in the long holes 78 m and are compressed when the stabilizing bar 14 m 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 32 n comprises on both sides a fastening 98 n in the form of a sprung lever configured in one piece with the stabilizing bar 14 n and having an integrated locking pin 60 n which fits into a corresponding recess in the surface area 40 n of the protective hood 10 n. On pulling the lever counter to spring force, the locking pin 60 n located on the stabilizing bar 14 n is unlatched, in a direction 68 n perpendicular to a surface of the surface area 40 n at the location of the recess, out of the corresponding recess and thus frees the stabilizing bar 14 n. The spring force required is achieved via the elastic stabilizing bar 14 n itself Furthermore, it is conceivable that the spring force is generated via additionally attached spring elements (not illustrated). Furthermore, the stabilizing bar 14 n may be installed rigidly and the locking pin 60 n installed so as to be loaded with spring pressure, so that the locking pin 60 n 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 14 n and to the surface area 14 n of the protective hood 10 n. Moreover, latching may also be provided only on one side. Alternatively, the locking pin 60 n may also be provided on the surface area 40 n, the fastening 98 n having a corresponding recess for positive connection.
FIG. 16 shows a further embodiment of the disclosure. The stabilizing bar 14 o consists of a planar basic body. The hand tool protection device has two bearing units 28 o, 30 o which are provided for mounting the stabilizing bar 14 o displaceably along a main direction of extent of the stabilizing bar 14 o. The bearing units 28 o, 30 o in each case comprise a hole contour 64 o integrally formed on a collar 48 o of a protective hood 10o and taking the form of a slot. The two slots of the two bearing units 28 o, 30 o are arranged on the collar 48 o on opposite sides of the protective hood 10 o, in a mounted state the stabilizing bar 14 o being stretched transversely over a reception region 12 o and being mounted in the two slots. In order to prevent the stabilizing bar 14 o from slipping out, hooks 72 o are formed at a first end of the stabilizing bar 14 o and widen a cross-sectional face of the stabilizing bar 14 o at this point. At a second end of the stabilizing bar 14 o, the latter is forked and likewise has hooks 74 o there. The stabilizing bar 14 o is therefore contoured in a region in which it directly delimits the reception region 12 o. By the stabilizing bar 14 o being forked at its second end, a spring element 32 o is formed which is provided for fixing the stabilizing bar 14 o in its position in the mounted state. For mounting the stabilizing bar 14 o, 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 30 o. For this purpose, the fork must be compressed slightly at the end of the stabilizing bar 14 o, so that the stabilizing bar 14 o fits, together with the hook 74 o, through the slot. As soon as the hooks 74 o have passed through the first slot, the fork returns to its initial position and the stabilizing bar 14 o can be pushed transversely over the reception region 12 o until the hooks 74 o stand at the second slot of the second bearing unit 28 o. The fork has to be slightly compressed anew here, so that the stabilizing bar 14 o, together with the hooks 74 o, can also pass through this second slot. An insertion depth of the stabilizing bar 14 o is limited by the hooks 72 o which with a marginal region of the first slot of the first bearing unit 30 o form a stop. When this position is reached, the hooks 74 o on the fork of the stabilizing bar 14 o have also just passed through the second slot and the fork has returned to its initial position. The stabilizing bar 14 o is consequently fixed securely between the two bearing units 28 o, 30 o. In an alternative embodiment, instead of the hooks 72 o, 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 14 p having no fork here. The stabilizing bar 14 p is held in two bearing units 28 p, 30 p which are provided for mounting the stabilizing bar 14 p displaceably along a main direction of extent 66 p of the stabilizing bar 14 p. The bearing units 28 p, 30 p in each case comprise a hole contour 64 p integrally formed on a collar 48 p of a protective hood 10 p and taking the form of a slot. The two slots of the two bearing units 28 p, 30 p are arranged on opposite sides of the collar 48 p, in a mounted state the stabilizing bar 14 p being stretched transversely over a reception region 12 p and being mounted in the two slots. At a first end of the stabilizing bar 14 p, a spring unit 32 p is fastened, which is in the form of a flat helical spring which is wound around the stabilizing bar 14 p and is supported, on the one side, on hooks 74 p formed on the stabilizing bar 14 p and, on the other side, on a margin of the slot of the bearing unit 30 p. Furthermore, the stabilizing bar 14 p has, at its second end lying opposite the helical spring, a further pair of hooks 72 p which, together with a marginal region of the slots of the bearing unit 28 p, form a stop when the stabilizing bar 14 p is in a mounted state. It is possible to extract the stabilizing bar 14 p by means of a sequence of three movements. In a first step, the stabilizing bar 14 p is pushed counter to spring force of the helical spring along the main direction of extent 66 p, so that the second end of the stabilizing bar 14 p slides out of the slot of the bearing unit 28 p. The hooks 74 p form a stop for this pushing movement. In a second step, the second end of the stabilizing bar 14 p is moved in a direction 70 p perpendicular to a covering wall 36 p of the protective hood 10 p, until the second end of the stabilizing bar 14 p is located above the bearing unit 28 p, as seen in the direction 70 p. In the third and last step, the stabilizing bar 14 p is simply drawn out of the slot of the bearing unit 30 p in the direction 68 p. In an alternative embodiment, instead of the hooks 72 p, 74 p, 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 14 p, may be envisaged.
In a further embodiment of the disclosure according to FIG. 18, a flat stabilizing bar 14 q, which has narrower stepped ends at its two ends, is held in two bearing units 28 q, 30 q which are provided for mounting the stabilizing bar 14 q displaceably along a main direction of extent 68 p of the stabilizing bar 14 q. The bearing units 28 q, 30 q in each case comprise a hole contour 64 q, 65 q integrally formed on a collar 48 q of a protective hood 10 p and taking the form of a slot with a stepped marginal contour, a first region, facing a covering wall 36 q, of the slot being longer than a second region facing away from the covering wall 36 q and arranged centrally with respect to the first region. The two slots of the two bearing units 28 q, 30 q are arranged on the collar 48 q on opposite sides of the protective hood 10 p, in a mounted state the stabilizing bar 14 q being stretched transversely over a reception region 12 q and being fixed in the two bearing units 28 q, 30 q. In this case, two spring units 32 q, 34 q press, with wire yoke springs fastened to a surface area 40 q of the protective hood 10 q, the stabilizing bar 14 q away from the covering wall 36 q in a direction opposite to the direction 66 q, so that the narrower stepped ends of the stabilizing bar 14 q in each case engage positively into the second region of the hole contours 64 q, 65 q. To free the stabilizing bar 14 q, the latter has to be pressed in the direction 66 q of the covering wall 36 q counter to spring force of the wire yoke springs, until the stepped ends of the stabilizing bar 14 q are in each case located in the first region of the hole contours 64 q, 65 q. In this position, the stabilizing bar 14 q can be pushed out of the hole contours 64 q, 65 q along its main direction of extent 68 q and extracted. In an alternative embodiment, the spring units 32 i, 32 j 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 14 q is achieved by pulling action instead of by pressing action, for example when spring elements are arranged on a side of the stabilizing bar 14 q which faces away from the covering wall 36 q.
An embodiment of the principle shown in FIG. 18, in which only one spring unit 32 r is used, is shown in FIG. 19. Here, a flat stabilizing bar 14 r is likewise mounted in two bearing units 28 r, 30 r, the bearing unit 30 r corresponding in its configuration to the bearing unit 28 q from FIG. 18 and the bearing unit 28 r corresponding in its configuration to the bearing unit 30 o from FIG. 16. An indentation located in both sides is provided, matching with a hole contour 65 r of the bearing unit 30 r, at a first end of the stabilizing bar 14 r and can be inserted into the hole contour 65 r. The other second end of the stabilizing bar 14 r is mounted in the opposite hole contour 64 q in the form of a slot. On the side of the bearing unit 30 r, the spring unit 32 r is provided, having a wire yoke spring which is fastened to a surface area 40 r of a protective hood 10 r and which presses the stabilizing bar 14 r in a mounted state away from a covering wall 36 r opposite to a direction 66 r. By an indentation located on both sides on the stabilizing bar 14 r engaging positively into the hole contour 65 r, the stabilizing bar 14 r is held securely in its position. To remove the stabilizing bar 14 r, the latter has to be pressed on the side of the spring unit 32 r in the direction 66 r toward the covering wall 36 r and subsequently has to be drawn out of the hole contours 64 q, 65 q along a main direction of extent 68 r of the stabilizing bar 14 r.
In a last embodiment of the disclosure according to FIG. 20, a stabilizing bar 14 s bent round at its two ends in the direction of a covering wall 36 s of a protective hood 10 s engages vertically, past a reception region 12 s, through slots in the covering wall 36 s. The ends of the stabilizing bar 14 s which project on a top side, facing away from the reception region 12 s, of the covering wall 36 s are contoured with hole contours 64 s, 65 s such that spring units 32 s, 34 s arranged on the top side of the covering wall 36 s hold the stabilizing bar 14 s in position by means of rotatably spring-loaded locking levers 98 s, 99 s. For this purpose, the locking levers 98 s, 99 s engage positively with hooks, not illustrated in any more detail, into the hole contours 64 s, 65 s. In an alternative embodiment, instead of hole contours 64 s, 65 s, projections, into which the hooks of the locking lever 98 s, 99 s engage, may also be provided at the ends of the stabilizing bar 14 s. 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.

Claims

1. A hand tool protection device, comprising:

a protective hood which at least partially surrounds a reception region for a tool, and

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.

2. The hand tool protection device according to claim 1, further comprising at least one fastening unit configured to fasten the stabilizing bar at at least one point on the protective hood in at least one operationally ready state.

3. The hand tool protection device according to claim 1, further comprising at least one fastening unit configured to releasably fasten the stabilizing bar to at least one component of the hand tool.

4. The hand tool protection device according to claim 1, further comprising at least one bearing unit configured to pivotably mount the stabilizing bar.

5. The hand tool protection device according to claim 1, further comprising at least one bearing unit configured to displaceably mount the stabilizing bar at least essentially along a main direction of extent of the stabilizing bar.

6. The hand tool protection device according to claim 1, wherein the stabilizing bar at least partially surrounds the protective hood.

7. The hand tool protection device according to claim 1, wherein the stabilizing bar is contoured in a region in which it directly delimits the reception region.

8. The hand tool protection device according to claim 1, further comprising at least one spring unit which is configured to fix the stabilizing bar in at least one operationally ready state by way of spring force.

9. The hand tool protection device according to claim 1, further comprising at least one magnet unit configured to fix the stabilizing bar in at least one operationally ready state by way of magnetic force.

10. An angle grinder having a tool, comprising:

a protective hood which at least partially surrounds a reception region for the tool, and