EP2106323A1

EP2106323A1 - Portable power tool system

Info

Publication number: EP2106323A1
Application number: EP07822425A
Authority: EP
Inventors: Cornelius Boeck; Joachim Schadow; Sinisa Andrasic
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2006-11-13
Filing date: 2007-11-09
Publication date: 2009-10-07
Anticipated expiration: 2027-11-09
Also published as: US20090036044A1; CN101535002A; EP2106321B1; WO2008058900A1; EP2106322B1; US20090130961A1; CN101534998B; EP2106321A1; CN101535002B; CN101534997A; EP2106323B1; RU2009122216A; RU2465117C2; US8460070B2; WO2008058910A1; EP2104590A1; RU2465118C2; RU2009122212A; EP2104590B1; EP2106322A1

Abstract

The invention relates to a portable power tool system comprising a portable power tool (12a-n), especially an angle grinder, a protective hood unit (14a-n) and a protective hood anti-rotation lock (16a-n) for providing anti-rotational locking between the protective hood unit (14a-n) and the portable power tool (12a-n) in the event of a breakage of a tool (18a-n). According to the invention, the protective hood anti-rotation lock (16a-n) is adapted to provide anti-rotational locking between the protective hood unit (14a-n) and the portable power tool (12a-n) while at the same time securing the protective hood unit (14a-n) to the portable power tool (12a-n) in a working position of the protective hood unit (14a-n).

Description

ROBERT BOSCH GMBH; D-70442 Stuttgart

Hand tool system

State of the art

The invention is based on a hand-held power tool system according to the preamble of claim 1.

From EP 812 657 Al an angle grinder with adjustable protective hood is already known. The protective hood is rotatably adjustable on a connecting piece of a flange of the angle grinder and releasably secured with only a single positive locking means. The flange will pass centrally from the spindle of the angle grinder. At its free end, the spindle carries a separating or grinding disk, which can be tensely tensioned, for cutting and machining workpieces, which is partially encompassed by the protective hood. In this case, the protective hood on the handheld power tool is to be positioned so that it can be adjusted in a rotational manner such that the area of the grinding wheel facing the user is encompassed by the protective hood. At the same time, an area of the grinding wheel pointing away from the user towards the workpiece engagement projects radially beyond the flange.

Advantages of the invention

The invention is based on a hand-held power tool system having a handheld power tool, in particular an angle grinder, a guard unit and a protective hood anti-rotation lock unit, which is provided for preventing rotation between the guard unit and the hand tool during a damage event of a tool. It is proposed that the guard-rotation-preventing unit be provided for an anti-rotation between the guard unit and the power tool simultaneously with an attachment of the guard unit to the power tool in a working position of the protective hood unit. In this context, the term "intended" should be understood to mean, in particular, specially equipped and / or specially designed

"Working position of the protective hood unit" are understood in particular a position of the protective hood unit, in which the guard unit is rotationally fixed to the hand tool in a regular working operation of the power tool and a protective hood of the guard unit advantageous protection for an operator from contact with a tool, in particular a disk-shaped Furthermore, the term "a damage case of a tool" should be understood to mean, in particular, a tool bursting during operation of the hand tool machine, individual tool parts being thrown outwards due to rotation of the tool , The embodiment of the hand-held power tool system according to the invention makes it more effective and, in particular, safer

Protection of an operator of the power tool before the rotating tool during operation of the power tool and / or in particular in a case of damage of the tool, such as in the case of bursting tool, are achieved in front of the operator flying parts of the tool. Advantageously, dimensioning of the protective hood rotation-preventing unit is designed in an anti-rotation position of the protective hood unit with the handheld power tool for receiving forces occurring in the event of damage to the tool, which forces are transmitted to the protective hood unit by tool parts of the ruptured tool striking the protective hood unit. Advantageously, a position of the protective hood unit during the event of damage of the tool by means of the guard locking device and a functionality of the guard unit is preferably maintained. Furthermore, in particular, a protective position or an anti-rotation position of the protective hood unit is formed by the working position of the protective hood unit, so that the anti-rotation position can be achieved structurally simple for an operator of the power tool system. In this case, the protective hood rotation-locking unit is particularly advantageously arranged at least partially on a protective hood and / or on a closure unit of the protective hood unit. In this case, a "closure unit" should be understood to mean, in particular, a unit which is preferably provided for attachment of the protective hood unit to the handheld power tool and has at least one closure element, such as a tightening strap, a screw, a locking lever, etc., wherein an attachment of the Guard unit on the hand tool by means of the locking unit can be done positively and / or non-positively. Furthermore, the term "arranged" is to be understood in particular to mean that the guard rotation-preventing unit and the protective hood and / or the closure unit have a common assembly unit and can be mounted on the hand-held power tool in an operating position during a common assembly operation.

A structurally simple and in particular stable rotation lock between the protective hood unit and the handheld power tool can be achieved if the guard locking unit has a force-locking unit and / or a form-locking unit which provides for a non-positive and / or a form-locking rotation lock between the guard unit and the Hand tool is provided.

Furthermore, it is proposed that the guard rotation-preventing unit has at least one anti-rotation element arranged on the guard unit and an anti-rotation element arranged on the hand tool machine, which are at least partially disposed in an anti-rotation position in the working position of the guard unit, thereby advantageously realizing an effective anti-rotation in a working position of the guard unit can be achieved and thus a high safety standard for an operator can be achieved.

If, in addition, the anti-rotation element is at least partially formed by a detent element which is intended to block movement of the protective hood unit in at least one direction, advantageously prevents rotation of the protective hood unit, in particular in the case of a bursting tool, and at least partially prevents a change in position of the protective hood unit. unit be facilitated for an operator of the power tool system. Preferably, a locking direction of the locking element corresponds to a direction of rotation of a tool, so that an advantageous rotation in case of damage of the tool can be achieved.

Furthermore, it is advantageously possible to save further components, installation space, assembly costs and costs if the anti-rotation element is formed at least partially in one piece with a closure unit and / or a protective hood of the protective hood unit. The term "integral" is intended to be understood in particular to be in one piece, produced from a casting and / or designed as a component. If the closure unit has at least one closure element on which the anti-rotation locking element is arranged, an anti-rotation lock of the protective hood unit that is secure against assembly can be achieved for an operator.

A particularly simple assembly and disassembly of the protective hood unit on the hand-held power tool can advantageously be achieved if the anti-rotation element is movably mounted on a locking unit and / or on a protective hood of the protective hood unit. Preferably, the anti-rotation element for releasing the anti-rotation position in an unlocking position is arranged manually movable by an operator. This can be achieved particularly advantageously if the anti-rotation element is at least partially around one

Swivel axis is rotatably mounted on the closure unit and / or on the guard.

In an alternative embodiment of the invention, it is proposed that the guard locking device comprise at least one lever element on which the anti-rotation element is at least partially arranged, whereby the anti-rotation element can advantageously be moved by means of the lever element into an anti-rotation position or into an inactive position. Particularly advantageous here is the lever member rotatably mounted on the power tool and / or on the guard unit.

Furthermore, it is proposed that the guard rotation-preventing unit has at least one movement element which moves the anti-rotation element in reaching the working position of the protective hood unit in a Verdrehsicherungsposition, whereby an independent of an operator, at least partially automatic fixing mechanism or movement mechanism to achieve the anti-rotation of the anti-rotation reaches and a high Safety standard for the operator independent of manual operation by the operator

Can be achieved operator of the guard rotation insurance unit. Advantageously, the movement element is formed by a spring element and / or further movement elements that appear appropriate to the person skilled in the art, for example a movement element formed by a magnet.

In an advantageous development of the invention, it is proposed that the protective hood rotation safety unit has at least one unlocking element which is provided for moving the anti-rotation element out of the anti-rotation position. As a result, an advantageous dismantling of the protective hood unit after a work process or after a be achieved with the power tool system. Preferably, the unlocking element is mounted at least partially movable on the guard unit, in particular spring-loaded biased in the anti-rotation, so that in addition to a compact arrangement of the unlocking an advantageous securing the Verdrehsicherungsele- ment can be achieved in the anti-rotation position.

Furthermore, advantageously, further components, installation space, installation effort and costs can be saved if the unlocking element is at least partially formed integrally with the locking element.

Advantageously, the handheld power tool has a receiving unit for receiving a tool on which the anti-rotation element is arranged, whereby a particular space-saving, compact Schutzschaudrehdrehsicherungseinheit can be achieved by the anti-rotation element of the power tool is arranged on a component, preferably in direct contact with the protective hood unit in a working position the

Guard unit is arranged.

In addition, it is proposed that the anti-rotation element arranged on the receiving unit is movably arranged on the receiving unit, whereby a particularly simple assembly and disassembly of the protective hood unit on the handheld power tool can advantageously be achieved.

Preferably, further components, installation space, assembly costs and costs can be saved if the anti-rotation element arranged on the receiving unit is formed at least partially in one piece with the receiving unit.

Does the guard rotation unit on at least two anti-rotation elements, which are arranged in a circumferential direction successively on the guard unit, and / or at least two anti-rotation elements, which are arranged in a circumferential direction successively on the hand tool, in particular on the receiving unit, a multi-positive and / or non-positive connection between the protective hood unit and the power tool can be achieved and / or it can be the guard unit in different positions along the circumferential direction of the power tool against rotation, in particular a bursting tool mounted. It should under one "Circumferential direction" in particular a circumferential direction of the protective hood unit are understood, which is aligned in an assembled state of the protective hood unit substantially parallel to a rotational direction of the tool.

Particularly advantageous, the invention comprises a hand tool for a rotating, preferably disc-shaped tool, with a machine housing having a flange or a machine neck on which a protective hood, in particular made of sheet metal, for covering the tool is releasably clamped, wherein the protective cover a Protective cover body has, which consists of a kreisscheibenformigen piece, in particular with an angled outer edge and has a central circular recess, at the edge of a protective hood or

-kragen is formed, which carries a clamping band in an annular manner, which is contractible by means of a clamping means and wherein an acting between machine neck and protective rotation between guard and machine neck is arranged in the form of a profiling, wherein the protective cover on the clamping band and / or on the clamping means in its clamping position several times positively and / or non-positively coupled with the machine neck and thus drehfest- is laid and can be brought to reach a release position except positive engagement and / or adhesion to the machine neck, the guard is then rotatably adjustable.

drawing

Further advantages emerge from the following description of the drawing. In the drawings, embodiments of the invention are shown. The drawing, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine these into meaningful further combinations.

Show it:

1 shows an exploded view of a hand tool machine system according to the invention,

2 a, 2 b show the anti-rotation protection unit from FIG. 1 with an anti-rotation element movably mounted on the clamping band in a schematic partial view from above in a first (FIG. 2 a) and a second embodiment variant (FIG. 2 b), FIG. Fig. 3, the guard rotation anti-rotation unit with an alternative to the

Tensioning band movably mounted anti-rotation element in a schematic sectional view,

4a, 4b show a guard rotation preventing unit with an anti-rotation element formed integrally with a tension band and a positioning unit in a schematic partial view from above (FIG. 4a) and a schematic side view (FIG. 4b), FIG.

5 shows a protective hood rotation-preventing unit with an anti-rotation element formed integrally with a tension band in the region of a closure element in a schematic partial view,

Fig. 6, the guard Verdrehsicherungseinheit from a one piece with a

Closure element formed anti-rotation element in a schematic partial view,

7a, 7b, 7c show the hand-held power tool system with a positioning unit and the guard rotation-preventing unit and a closure unit configured alternatively to FIG. 6 and in a schematic partial view (FIG. 7a), in a side view (FIG. 7b) and in a further alternative embodiment in one Side view (FIG. 7c),

8a, 8b show a protective hood rotation-locking unit with an anti-rotation element movably mounted on a locking element in a schematic side view (FIG. 8a) and a perspective view (FIG. 8b), FIG.

9 shows an anti-rotation protection unit with an anti-rotation element movably mounted on a receiving unit in an exploded view,

Fig. 10 is a guard rotation preventing unit, which integrally on a

Protective hood of a protective hood unit is arranged in a perspective view,

11 is a protective view of a guard rotation preventing unit integrally formed with a protective hood anti-rotation elements, which is held by means of a spring element in a Verdrehsicherungsposition in a schematic partial view,

FIG. 12 is an exploded view of an anti-rotation protection unit with an anti-rotation device based on a force fit; FIG. 13a, 13b show a protective hood rotation-locking unit with a release element arranged on the protective hood in a schematic sectional illustration (FIG. 13a) and a perspective partial view (FIG. 13b), FIG.

14 shows a protective hood rotation-locking unit with an anti-rotation element arranged on the protective hood and unlocking element in a schematic view from above and FIG

FIG. 15 shows an alternative embodiment of a protective hood rotation-locking unit to FIG. 14 with an anti-rotation element arranged on the protective hood and an unlocking element in a schematic view from above.

Description of the exemplary embodiments

FIG. 1 shows a hand-held power tool system 10a with a handheld power tool 12a formed by an angle grinder, a protective hood unit 14a and a guard anti-rotation lock unit 16a. For receiving the protective hood unit 14a or a tool 18a formed by a cutting disk, the hand tool 12a has a receiving unit 60a, which is screwed to a hand tool machine housing 66a of the hand tool 12a. A drive shaft 70a protrudes from the receiving unit 60a on a side 68a facing away from the power tool housing 66a, which drive shaft can be connected at its free end 72a to the disk-shaped tool 18a and can be driven to rotate about an axis 74a. The protective hood unit 14a comprises a protective hood 22a and a locking unit 20a on which the guard anti-rotation lock unit 16a is arranged. The protective hood 22a covers an angular range of the tool 18a of approximately 180 ° and for this purpose has a half-disc-shaped protective hood body 76a and a protective hood edge 78a, which is initially aligned perpendicular to halbscheibenformigen guard body 76a and then parallel to the half-disc-shaped guard body 76a in a radial direction 80a inwardly is. The guard rotation-preventing unit 16a is for preventing rotation between the guard unit 14a and the hand tool 12a or the Aufhahmeein- unit 60a during a damage case of the tool 18a, such as in a bursting

Tool 18a, provided, wherein the rotation between the guard unit 14a and the power tool 12a at the same time with an attachment of the guard unit 14a on the power tool 12a in a working position of the guard unit 14a. The protective hood 22a also has a protective collar collar 82a, which is aligned substantially perpendicular to the half-disk-shaped protective hood body 76a (FIGS. 1, 2a and 2b). The protective hood collar 82a is outwardly surrounded in the radial direction 80a by a tension band 84a of the closure unit 20a, wherein the protective collar collar 82a and the tension band 84a are connected to one another by means of a welded connection. Together with the tensioning band 84a, the protective hood collar 82a is provided for fastening the protective hood unit 14a to the hand-held power tool 12a or to the receiving unit 60a, which has a cylindrical receiving flange 86a for this purpose. Along a circumferential direction 62a, 64a of the tension band 84a, the tension band 84a has, in a region facing away from the protective hood 22a, two end regions 88a, 90a which extend outward in the radial direction 80a. The two end regions 88a,

90a each have a recess 92a through which a closure element 46a of the closure unit 20a formed by a clamping screw is guided. The clamping screw can be fastened by means of a nut 94a in the recesses 92a of the clamping band 84a. The protective hood 22a is fastened by means of the locking unit 20a to the receiving unit 60a or to the receiving flange 86a due to a frictional engagement between the protective collar 82a and the clamping band 84a and the receiving flange 86a in a working position, so that the protective hood unit 14a in a regular operation of the power tool 10a is arranged rotationally fixed. In principle, in an alternative embodiment of the closure unit, it is always conceivable to use further closure elements 46a, such as, for example, a tensioning lever and / or positive locking elements, etc., instead of the tensioning screw.

The protective hood rotation-preventing unit 16a secures the protective hood unit 14a in the event of a damage of the tool 18a, in particular in the case of a bursting tool 18a, against undesired twisting. For this purpose, the guard rotation-preventing unit 16a has a form-fitting unit 26a, which leads to a positive connection between the guard unit

14a and the receiving flange 86a of the power tool 12a, wherein a form-locking connection coincides with an attachment of the guard unit 14a in a working position on the receiving flange 86a. To achieve the form-locking connection, the form-fitting unit 26a or the guard-rotation-preventing unit 16a has three anti-rotation elements 28a, 30a, 32a formed by a form-locking element, which are arranged on the clamping band 84a of the closure unit 20a, and a plurality of anti-rotation elements 34a, 36a formed by a respective form-locking element formed integrally with the receiving unit 60a. The anti-rotation elements 34a, 36a arranged on the receiving unit 60a are formed by latching recesses and in the circumferential direction 62a, 64a The holding flange 60a is arranged successively around the receiving flange 60a, the anti-rotation elements 34a, 36a being open in a direction 96a extending parallel to the axis 74a by the receiving unit 60a in the direction of the tool 18a and on a base element 98a of the receiving unit 60a substantially perpendicular to the axis 74a is aligned, are arranged. The arrangement of the anti-rotation elements 34a, 36a allows attaching or securing the protective hood unit 14a at different working positions in the circumferential direction 62a, 64a on the hand tool 12a.

The three anti-rotation elements 28a, 30a, 32a of the protective hood unit 14a are arranged one after the other in the circumferential direction 62a, 64a and formed by latching elements 38a, 40a, 42a, which form a

Lock movement of the protective hood unit 14a in a mounted state in one direction (Figure 2a). A blocking direction corresponds to a direction of rotation of the tool 18a, so that with a bursting tool 18a, the protective hood unit 14a remains fixed in its protective position. For this purpose, the latching elements 38a, 40a, 42a are formed in a section and have a substantially triangular cross-sectional area, so that upon release of a fastening or the

Clamping screw rotation of the guard 22a in a direction is possible, which is aligned opposite to the direction of rotation of the tool 18a during operation of the power tool 12a (Figure 2a). Alternatively, in FIG. 2b, the anti-rotation elements 28a, 30a, 32a are provided with a substantially rectangular cross-sectional area which causes the protective hood 22a to be secured against rotation along the circumferential direction 62a, 64a in both directions.

Furthermore, the anti-rotation elements 28a, 30a, 32a are movably mounted on the tension band 84a. For this purpose, the guard rotation-preventing unit 16a has a lever element 52a, which is arranged pivotably about a pivot axis 50a on the clamping band 84a. The pivot axis 50a of the lever element 52a is aligned in a mounted state of the protective hood unit 14a on the hand tool 12a substantially perpendicular to the axis 74a and extends from the axis 74a in a radial direction 80a. The anti-rotation elements 28a, 30a, 32a are arranged on an end 100a of the lever element 52a facing away from the pivot axis 50a and extend in a manner along a pivot direction 102a about the pivot axis 50a on the lever element 52a, wherein the anti-rotation elements 28a, 30a, 32a in one

Working position of the protective hood unit 14a are arranged on one of the anti-rotation elements 34a, 36a facing side of the lever member 52a. Furthermore, the guard rotation-preventing unit 16a has a movement element 54a, which is formed by a spring element 56a and the lever element 52a or the anti-rotation elements 28a, 30a, 32a in an anti-rotation position upon reaching a working position of the protective hood unit 14a during assembly with the power tool 12a emotional. As a result, the anti-rotation elements 28a, 30a, 32a are always in the anti-rotation position as soon as the protective hood unit 14a is mounted in the working position. The spring element 56a is supported on a support element 104a of the tension band 84a, wherein the support element 104a is arranged along the axis 74a on a region 106a remote from the anti-rotation elements 28a, 30a, 32a, and a spring force the lever element 52a along the axis 74a into a tool 18a opposite direction 108a presses. To release the anti-rotation position of the anti-rotation elements 28a, 30a, 32a, the lever element 52a has an unlocking element 58a formed by a tab, which is arranged on the end 100a of the lever element 52a facing away from the pivot axis 50a and projects outward along the radial direction 80a Lever element 52a extends, so that an operator by means of the tab, the lever element 52a can move together with the anti-rotation elements 28a, 30a, 32a from the anti-rotation position along the pivot direction 102a. In principle, it is also conceivable that the closure unit 20a can only be closed when the anti-rotation elements 28a, 30a, 32a are in an anti-rotation position. For a disassembly or a change in position of the protective hood unit 14a in the circumferential direction 62a, 64a, the locking unit 20a must be released and in the case of rotation in both directions and the guard rotation preventing unit 16a are brought from its anti-rotation position, so that the anti-rotation elements 28a, 30a, 32a disengaged with the recesses of the receiving unit 60a and a rotation or a disassembly of the protective hood unit 14a with respect to the power tool 12a is possible.

In addition, the hand-held power tool system 10a has a coding device 110a which is provided to prevent assembly of tools 18a or of tools 18a together with the protective hood unit 14a on unsuitable hand-held power tools 12a. For this purpose, the tension band 84a has a coding element 112a of the coding device 110a, which is formed integrally with the tension band 84a. The coding device 112a is formed by a shape extending inward in the radial direction 80a and has a rectangular shape. Corresponding to this, the receiving flange 86a has a coding element 114a of the coding device 110a, which is formed by a recess into which the coding means 112a of the clamping band 84a during assembly of the protective hood unit 14a with the hand tool 12a is inserted. After inserting the protective hood unit 14a on the receiving unit 60a, the protective hood unit 14a can be rotated into a working position. For this purpose, the receiving flange 86a has a circumferential groove 62a in the circumferential direction 62a, 64a, in which, upon rotation of the protective hood unit 14a into the working position, the coding element 112a is guided.

In the figures 3 to 15 alternative embodiments are shown. Substantially identical components, features and functions are basically numbered by the same reference numerals. To distinguish the embodiments, however, the letters a to n are added to the reference numerals of the exemplary embodiments. The following description is limited essentially to the differences from the exemplary embodiment in FIGS. 1 and 2, wherein reference can be made to the description of the exemplary embodiment in FIGS. 1 and 2 with regard to components, features and functions remaining the same.

FIG. 3 shows a hand-held power tool system 1, whether in a partial section with a

Accommodating unit 60b of a power tool 12b, a tightening strap 84b of a guard unit 14b and a guard rotation preventing unit 16b. The guard locking unit 16b is provided for preventing rotation between the guard unit 14b and the hand tool 12b at the same time as reaching a working position of the guard unit 14b during assembly. For this purpose, the guard anti-rotation lock unit 16b has a rotational locking element 28b arranged on the tightening strap 84b of a locking unit 20b and a plurality of anti-rotation locking elements 34b, 36b arranged on the receiving unit 60b. The anti-rotation elements 34b, 36b arranged on the receiving unit 60b are formed by recesses which are arranged in succession on a receiving flange 86b of the receiving unit 60b in a circumferential direction 62b, 64b. The recesses extend radially inwardly from a radially outwardly directed surface 118b of the receiving flange 86b. The anti-rotation element 28b arranged on the closure unit 20b is arranged on a lever element 52b of the protective cover anti-rotation lock unit 16b. The lever element 52b is pivotably mounted on the tension band 84b, wherein a pivot axis 50b of the lever element 52b is aligned substantially perpendicular to a circumferential direction 62b, 64b of the tension band 84b. In order to fix the lever element 52b together with the anti-rotation element 28b in an anti-rotation position, the lever element 52b is supported on the clamping band 84b by means of a movement element 54b formed by a spring element 56b, wherein the spring element 56b is formed by a tension spring which is in radial movement. tion 80b between the clamping band 84b and a radially in the direction 80b inwardly facing surface of the lever member 52b is arranged. In this case, the lever element 52b is moved together with the anti-rotation element 28b by the spring element 56b about the pivot axis 50b inwardly and pulled and in a Verdrehsicherungsposition, namely in engagement with the anti-rotation elements 34b, 36b of the receiving flange brought. In addition, this indicates

Strap 84b has a recess 122b through which the anti-rotation element 28b engages with the receiving flange 86b in an anti-rotation position. At an end 120b facing away from the anti-rotation element 28b, the lever element 52b has an unlocking element 58b formed by a tab, by means of which the lever element 52b can be moved by an operator from its anti-rotation position against a spring force of the spring element 56b. A release of a clamping closure element 46b, which is formed by a clamping screw, is only possible for an operator if he previously moved the lever member 52b from its anti-rotation position.

FIG. 4 a shows a hand-held power tool system 10 c with a protective guard locking unit 16 c in a partial section with an anti-rotation element 28 c of a protective hood unit 14 c, which is alternatively designed for FIG. 3. The guard anti-rotation lock unit 16c is provided to prevent rotation between the guard unit 14c and a hand tool not shown in detail at the same time reaching a working position of the guard unit 14c during assembly. The anti-rotation element 28c is formed by a hook-shaped detent element 38c. In addition, the latching element 38c is integrally formed with a clamping band 84c of a closure unit 20c, the latching element 38c being arranged bent inwards by the tensioning band 84c. As a result, the latching element 38c effects an anti-twist analogous to the description of FIG. 2a and allows rotation in the case of a released closure element 46c of the closure unit 20c formed by a clamping screw in a direction which runs counter to a rotational direction of a tool.

In order to facilitate assembly of the protective hood unit 14c or a change in position of the already mounted protective hood unit 14c on a receiving flange for an operator, the hand-held power tool system 10c has a positioning device 124c. The protective hood unit 14c has a positioning element 126c of the positioning device 124c, which is formed integrally with the clamping band 84c (FIGS. 4a and 4b). The positioning element 126c is arranged on an edge region 128c of the tension band 84c, the edge region 128c facing away from the tool in an assembled state of the protective hood unit 14c. In addition, the positioning Accordingly, 126c in a circumferential direction 62c, 64c web-shaped, wherein the positioning member 126c along two, the clamping band 84c facing sides 130c, 132c of the clamping band 84c is punched and arranged on an end portion 134c in the circumferential direction 62c, 64c on the clamping band 84c (FIG 4b). At a free end 136c in the circumferential direction 62c, 64c, the positioning element 126c has an expression which extends inward in the radial direction 80c and has a contour which is substantially identical in shape to a contour of a positioning element, not shown, of a receiving flange.

FIG. 5 shows a partial section of a hand-held power tool system 1 Od with a guard locking unit 16d, which is provided for preventing rotation between a protective hood unit 14d and a handheld power tool 12d (not shown in detail) at the same time as reaching a working position of the guard unit 14d during assembly is. The guard rotation preventing unit 16d differs from the embodiment in FIGS. 4a and 4b in that a rotation preventing member 28d of the guard rotation preventing unit 16d is disposed in an end portion 9Od of a tightening band 84d of a locking unit 20d arranged in the circumferential direction 62d, 64d. The anti-rotation element 28d is integrally formed with the tension band 84d and bent inwardly from the tension band 84d. In addition, the guard rotation-preventing unit 16d has a plurality of anti-rotation elements 34d, 36d, each formed by a latching recess, on a receiving unit 6Od of the handheld power tool 12d. An operation of the guard rotation lock unit

16d is analogous to the description in FIGS. 2a, 4a and 4b. In addition, the closure unit 2Od has a closure element 46d, 48d along the circumferential direction 62d, 64d at end regions 88d, 9Od of the tension band 84d. The closure elements 46d, 48d are formed by a screw and a closure lever, wherein the screw connects one of the end regions 88d of the tension band 84d with the tensioning lever arranged on the further end region 9Od.

The screw is rotatably mounted on the end portion 88d and arranged in the circumferential direction 64d of the end portion 88d in the direction of the locking lever for a bearing point or a rotation axis 138d of the locking lever with the end portion 9Od. A protective hood is by means of the closure unit 2Od on the receiving unit 6Od or on a receiving flange 86d of the receiving unit 6Od by means of a frictional engagement between a protective hood collar or the

Clamp 84d and the receiving flange 86d fixed in a working position. In addition, by means of the screw, an effective fastening force can be set for an operator when mounted between the protective hood unit 14d and the receiving flange 86f. FIG. 6 shows a partial section of a hand-held power tool system 10e with a guard anti-rotation lock unit 16e. The guard rotation-preventing unit 16d is provided for preventing rotation between a guard unit 14d and a hand tool 12e not shown in detail at the same time as reaching a working position of the protective hood unit 14e during assembly and for this purpose has an anti-rotation element 28e formed by a locking cam, which is integral with a Closure element 46e a closure unit 2Oe is formed. The closure unit 20e is designed analogously to the description for FIG. 5, wherein the anti-rotation element 28e is arranged on a tensioning lever and extends inwardly from the latter in a closed state of the closure unit 20e in a radial direction 80e. If the anti-rotation element 28e is in an anti-rotation position or if the protective hood unit 14e is mounted on the handheld power tool 12e in a working position, the anti-rotation element 28e engages in one of a plurality of anti-rotation elements 34e, 36e formed analogously to the description of FIG are arranged on a receiving flange 86e of a receiving unit 6Oe. In addition, a clamping band 84e has a recess 122e, through which the anti-rotation element 28e engages to reach the position for securing against rotation.

FIG. 7 a shows a partial view of a hand-held power tool system 1 Of with a guard anti-rotation locking unit 16 f. The guard rotation preventing unit 16f is provided for preventing rotation between a guard unit 14f and a hand tool 12f not shown in detail at the same time as reaching a working position of the guard unit 14f during assembly, and has an anti-rotation member 28f integrally formed with a shutter member 46f of a shutter unit 2Of is. The closure element 46f is formed by a tensioning lever, which is rotatably mounted on an end region 88f of a tension band 84f formed by an eyelet. The tensioning lever has a recess 14Of, through which a further end region 9Of of the tensioning band 84f engages, wherein the end portion 9Of has a continuously rising outward contour viewed from the tensioning band 84f, so that when the closure unit 2Of closes, a tightening band diameter is reduced and reduced Effective frictional connection between the protective hood unit 14f and a receiving unit 6Of can be generated. An embodiment of the tension band 84f and the receiving unit 6Of for achieving an anti-rotation position is formed analogously to the description of FIG. In addition, the hand-held power tool system 1 Of in FIGS. 7a and 7b has a positioning device 124f, which is designed analogously to the description relating to FIGS. 4a and 4b. FIG. 7c shows an alternative embodiment of a positioning device 124f to FIGS. 7a and 7b. A positioning member 126f extends on the tension band 84f perpendicular to a circumferential direction 62f, 64f of the tension band 84f and, in a mounted state of the guard unit 14f, faces away from a tool. Positioning elements 142f of the positioning device, which are formed by notches on the receiving unit 6Of, are used for positional scanning

124f are arranged in a circumferential direction 62f, 64f successively on a base element 98f of the receiving unit 6Of about a receiving flange 86f.

FIGS. 8a and 8b show a partial sectional view of a hand-held power tool system 10g with a guard locking device 16g. The guard anti-rotation lock unit 16g is provided for preventing rotation between a guard unit 14g and a hand tool 12g not shown in detail at the same time as reaching a working position of the guard unit 14g during assembly and for this purpose has an anti-rotation lock member 28g attached to a closure member 46g Locking unit 20g is movably mounted. For this purpose, the anti-rotation element 28g has a recess 144g, through which the closure element 46g engages. The closure element 46g is formed analogously to Figure 1 by a clamping screw. Moving into an anti-rotation position takes place when a protective hood unit 14g is fastened in a working position by bringing the anti-rotation element 28g into the anti-rotation position by means of a frictionally engaged connection with the clamping screw (FIG. 8b). Alternatively, a positive connection between the clamping screw and the anti-rotation element 28g is conceivable. Furthermore, a receiving flange 86g has a plurality of anti-rotation elements 34g formed by a respective recess, of which only one can be seen in FIG. 8a. The recesses are successively arranged on a receiving flange 86g along a circumferential direction 62g, 64g in a radially outward edge region 146g.

FIG. 9 shows a hand-held power tool system 10h with a protective hood anti-rotation lock unit 16h, a receiving unit 60h and a protective hood unit 14h. The protective hood rotation-preventing unit 16h is provided for preventing rotation between the protective hood unit 14h and a handheld power tool 12h at the same time as reaching a working position of the protective hood unit 14h during assembly, and for this purpose has an anti-rotation element 34h which is movably arranged on the receiving unit 60h. The anti-rotation element 34h is arranged on a base element 98h of the receiving unit 60h and extends outward in a radial direction 80h from a receiving flange 86h. Around to ensure a Verdrehsicherungsposition in a working position of the protective hood unit 14h on the receiving flange 86h, the anti-rotation element 34h is held by a spring element not shown in an anti-rotation position. Further, the anti-rotation member 34h is integrally formed with a lever member 52h, with which a release of the anti-rotation element 34h from the anti-rotation position can be manually achieved by an operator. In addition, a clamping band 84h of a closure unit 20h has a plurality of anti-rotation elements 28h, 30h formed by a respective recess, which are arranged one after the other on the clamping band 84h in a circumferential direction 62h, 64h. In addition, in an assembled state of the protective hood unit 14h, the recesses are arranged on an edge region 128h of the clamping band 84h facing the base element 98h.

FIG. 10 shows a hand-held power tool system 10i with a protective hood anti-rotation locking unit 16i, a partially illustrated receiving unit 6Oi and a protective hood unit 14i. The guard rotation preventing unit 16i is provided for preventing rotation between the guard unit 14i and a hand tool at the same time as reaching a working position of the guard unit 14i during assembly, and has three anti-rotation elements 28i, 30i, 32i formed integrally with a guard 22i of the guard unit 14i , The three anti-rotation elements 28i, 30i, 32i of the protective hood unit 14i are designed as toothing and are arranged one after the other in the circumferential direction 62i, 64i. The teeth are on a protective hood collar 82i facing

Edge region 148i of a guard body 76i of the protective hood 22i arranged and extend from the protective hood 22i or within a plane of the guard body 76i in the radial direction 80i inward so that they are aligned substantially perpendicular to a circumferential direction 62i, 64i of the guard collar 82i. In addition, the teeth are integrally formed on the protective hood 22i by means of a stamping bending process. Furthermore, a receiving flange 86i of the handheld power tool has a plurality of anti-rotation elements 34i, 36i, each formed by a positive locking element, which are formed integrally with the receiving flange 86i. The anti-rotation elements 34i, 36i arranged on the receiving flange 86i form a toothing running in the circumferential direction, the anti-rotation elements 34i, 36i on one side 68i of the receiving flange 86i extending in an outer direction in the radial direction 80i

Edge region 152i are arranged, wherein the side 68i is facing a tool in an operation of the power tool. As soon as the protective hood unit 14i is arranged in a working position during assembly on the handheld power tool, the anti-rotation lock elements 28i, 30i, 32i, 34i, 36i interlock with one another or are located in a torsional locking device. ment position and the guard 22i is secured against undesired rotation in the event of a bursting tool in operation. The anti-rotation elements 28i, 30i, 32i of the protective hood 22i engage the anti-rotation elements 34i, 36i during a process of inserting the protective hood unit 14i on the receiving unit 6Oi from the protective hood unit 14i in a direction 108i of a hand-held power tool housing.

FIG. 11 shows a hand-held power tool system 1 Oj with a guard anti-rotation lock unit 16j, a receiving unit 6Oj and a guard unit 14j. The protective hood rotation-preventing unit 16j has a form-locking unit 26j, which is provided for securing against rotation of a protective hood 22j on a hand-held power tool at the same time as fastening the protective hood unit 14j to the hand-held power tool. On a protective hood collar 82j of the protective hood 22j of the protective hood unit 14j, a plurality of anti-rotation elements 28j are arranged thereon, which extend from the protective hood collar 82j in a direction away from the protective hood 22j, only one of the anti-rotation elements 28j being illustrated. Basically, the anti-rotation elements 28j instead of the

Guard collar 82j may also be arranged on the strap 84j in an alternative embodiment of the invention. The anti-rotation elements 28j are integrally formed with the protective collar collar 82j and arranged in a circumferential direction successively on the protective collar collar 82j. In addition, the receiving unit 6Oj also has a plurality of anti-rotation elements 34j, which are formed integrally with the receiving unit 6Oj. The anti-rotation elements 34j are formed by recesses and are arranged successively in the circumferential direction about a receiving flange 86j on a base member 98j of the receiving unit 6Oj. In order to avoid an automatic release of the anti-rotation position of the protective hood 22j relative to the handheld power tool, the receiving unit 6Oj has an edge element 154j in the region of the anti-rotation locking elements 34j. The edge member 154j is aligned substantially parallel to a surface 81j of the receiving flange 86j facing in the radial direction 80j and formed integrally with the receiving unit 6Oj. In addition, the edge element 154j is arranged spaced from the surface 118j on the receiving unit 6Oj, wherein the anti-rotation elements 34j are arranged between the edge element 154j and the surface 118j. On an end 156j of the edge element applied to the anti-rotation elements 34j

154j, it has a support member 158j extending inward in a radial direction 80j. During assembly and during a working position of the protective hood unit 14j, the support element 158j supports a movement element 54j formed by a spring element 56j, which is arranged on the protective hood unit 14j. The protective hood unit 14j for this purpose also has an edge element 16Oj which extends outward in the radial direction 8Oj from the protective collar collar 82j and is arranged on an edge region of the protective collar collar 82j facing the anti-rotation elements 34j. The spring element 56j is arranged on the edge element 16Oj. For disassembly of the guard unit 14j, it must be raised so that the anti-rotation elements 28j, 34j are disengaged, and subsequently rotated so that the two rim elements 154j, 16Oj are circumferentially spaced, and the guard unit 14j can be detached by an operator ,

FIG. 12 shows a hand-held power tool system 10k with a guard anti-rotation locking unit 16k, a receiving unit 60k and a protective hood unit 14k. The protective hood anti-rotation lock unit 16k has a force-locking unit 24k, which is provided to prevent rotation of a protective hood 22k on a hand-held power tool at the same time as fastening the protective hood unit 14k to the hand-held power tool. For this purpose, a receiving unit 60k and a protective hood collar 82k each have an anti-rotation element 28k, 34k, which are each formed by a coated surface with an increased coefficient of friction. In principle, it is also conceivable that the surfaces of the protective collar collar 82k and the Aufkahmeflanschs 86k have a desired coefficient of friction due to a choice of material and / or a surface treatment. In a mounted state or in a working position of a protective hood unit 14k, the protective hood unit 14k is fastened in a force-locking manner to the receiving unit 60k by means of a locking unit 20k. The coated O berflächen are arranged adjacent to each other in a mounted state of the protective hood unit 14k, so that in the case of a bursting tool against rotation due to a frictional engagement between the two coated surfaces or between the guard unit 14k and the power tool arises.

FIGS. 13a and 13b show a partial sectional view of a hand-held power tool system 101 having a protective cover rotation-preventing unit 161, a receiving unit 601 and a protective hood unit 141. The guard anti-rotation lock unit 161 has a form-locking unit 261, which is used to prevent rotation of a protective hood 221 on a hand-held power tool at the same time as attachment of the guard unit 141 to the hand-held power tool. For this purpose, the receiving unit 601 a plurality of, in the circumferential direction 621, 641 successively arranged anti-rotation elements 341, 361 of the guard Verdrehversicheresicherung- unit 161, which form a toothing and extending at a radially outer edge region 801 outer edge region 1461 on a side 681 thereof, wherein the page 681 in one assembled state of the power tool system 101 facing a tool. Another anti-rotation element 281, which is formed by a toothing corresponding to the anti-rotation elements 341, 361 of the receiving unit 601, is arranged on the protective hood unit 141. The anti-rotation element 281 is integrally formed with a Entriegelungsele- element 581, which is mounted in the radial direction 801 movable on the guard 221.

The unlocking element 581 is integrally formed on an outer contour of the protective hood 221, the unlocking element 581 being arranged in the radial direction 801 at a distance from a protective hood edge 781 of the protective hood 221, so that a movement of the unlocking element 581 into an anti-rotation position or out of the anti-rotation position is possible , To engage in the anti-rotation elements 341, 361 of the receiving unit 601, a protective hood collar 821 has a recess 1621, through which the unlocking element 581 engages together with the anti-rotation locking element 281. In order to move the unlocking element 581 together with the anti-rotation element 281 in an anti-rotation position at the same time as reaching a working position of the protective hood unit 141 or in the anti-rotation position, the guard anti-rotation lock unit 161 has a movement element 541 formed by a spring element 561, which moves the unlocking element 581 in the radial direction Direction 801 inwardly supported on a guard collar 821. An anti-rotation position of the anti-rotation element 281 with the anti-rotation elements 341, 361 of the receiving unit 601 is achieved when the unlocking element 581 is in an outer end position in the radial direction 801. To release the rotation, the unlocking element 581 of a

Operator pressed against a spring force of the spring element 561 inward and pushed the anti-rotation element 281 of the protective hood unit 141 out of engagement with the anti-rotation elements 341, 361 of the receiving unit 601. A change in position of the protective hood unit 141 on the hand tool is thus possible.

FIG. 14 shows a partial sectional view of a hand-held power tool system 10m with a protective guard assembly 16m, a receiving unit 60m and a guard unit 14m. The protective cover anti-rotation lock unit 16m has a form-locking unit 26m which is provided to prevent rotation of a protective hood 22m on a hand-held power tool at the same time as securing the protective hood unit 14m to the hand-held power tool. For this purpose, a receiving unit 60m has a plurality of securing elements 34m, 36m of the protective hood twisting unit 16m arranged one after the other in the circumferential direction 62m, 64m, each of which is formed by a recess and arranged on a peripheral edge region 146m in the radial direction 80m. In addition, the protective hood rotation locking unit 16m further anti-rotation elements 28m, 30m, 32m, which are integrally formed with an unlocking element 58m, wherein the unlocking element 58m is arranged on a side facing away from a tool 164m of a guard body 76m of a protective hood 22m. The unlocking element 58m is arranged tangentially to the receiving unit 60m on the protective hood 22m in a working position of the protective hood unit 14m, wherein the anti-rotation elements 28m, 30m, 32m extend inward in the radial direction 80m on a side 166m of the unlocking element 58m facing the receiving unit 60m. The unlocking element 58m has two recesses 168m formed by oblong holes, by means of which the unlocking element 58m is mounted so as to be movable inwardly or outwardly on the protective cover 22m. For this purpose, 168m screws 170m are mounted in the recesses, which are screwed to the protective cover 22m. In order to move or hold the unlocking element 58m in an anti-rotation position, the guard anti-rotation lock unit 16m has a movement element 54m formed by a spring element 56m, which is supported on the protective cover 22m. The unlocking element 58m protrudes beyond the guard body 76m with both end portions 172m so that the unlocking member 58m can be easily moved by an operator from its anti-rotation position. Actuation by the operator may be at both end portions 172m. In addition, an embodiment of the anti-rotation elements 28m, 30m, 32m of the protective hood unit 14m and the recesses of the receiving unit 60m allows easy insertion of the protective hood unit 14m on the hand tool by engaging the protective hood 22m with one of the anti-rotation elements 28m, 30m, 32m of the protective hood unit 14m Help the spring element 56m is centered in the working position.

FIG. 15 shows an alternative handheld power tool system 10n to FIG. The hand-held power tool system 10n differs from FIG. 14 in that an unlocking element 58n of a guard rotation-preventing unit 16n is formed integrally with a rotation-preventing element 28n and rotatably supported by a pivot bearing 174n on a guard body 76n of a protective hood 22n. An axis of rotation of the unlocking element 58n is aligned substantially perpendicular to a protective hood body 76m. The unlocking member 58n is held together with the anti-rotation member 28m in an anti-rotation position with a receiving unit 60m by means of a moving member 54m formed by a spring member 56m.

Claims

ROBERT BOSCH GMBH; D-70442 Stuttgart claims

A hand-held power tool system having a hand-held power tool (12a-n), in particular an angle grinder, a protective hood unit (14a-n) and a guard anti-rotation lock unit (16a-n), which serve to prevent rotation between the guard unit (14a-n) and the hand tool ( 12a-n) is provided during a damage event of a tool (18a-n), characterized in that the protective gear anti-rotation lock unit (16a-n) is secured against twisting between the protective hood unit (14a-n) and the handheld power tool (12a-n ) is provided simultaneously with a fastening of the protective hood unit (14a-n) to the handheld power tool (12a-n) in a working position of the protective hood unit (14a-n).

2. Hand tool machine system according to claim 1, characterized in that the protective hood unit (14a-h) has a closure unit (20a-h) on which at least partially the guard rotation preventing unit (16a-h) is arranged.

3. hand tool system according to claim 1, characterized in that the protective hood unit (14i-n) has a protective hood (22i-n) on which at least partially the guard rotation preventing unit (16i-n) is arranged.

4. Hand tool machine system according to one of the preceding claims, characterized in that the guard anti-rotation lock unit (16k) has a adhesion unit (24k), which is provided for a non-positive rotation between the guard unit (14k) and the power tool (12k).

5. Hand tool machine system according to one of the preceding claims, characterized in that the guard rotation preventing unit (16a-j, 161-n) has a form-fitting unit (26a-j, 261-n), which for a positive rotation between the guard unit (14a-a j, 141-n) and the hand tool (12a-j, 121-n).

6. Hand tool system according to one of the preceding claims, characterized in that the guard rotation preventing unit (16a-n) at least one on the guard unit (14a-n) arranged anti-rotation element (28a, 30a, 32a; 28b-g; 28h, 30h; 28i, 30i , 32i, 28-1, 28m, 30m, 32m, 28n) and an anti-rotation element (34a-n; 36a-g; 36i-j; 361-n) disposed on the hand tool (12a-n) which is in the working position the protective hood unit (14a-n) are at least partially arranged in an anti-rotation position.

7. Hand tool system according to claim 6, characterized in that the

Anti-rotation element (28a, 30a, 32a; 28c; 28d) is at least partially formed by a latching element (38a, 40a, 42a; 38c; 38d) which is arranged to move the protective hood unit (14a; 14c; 14d) into at least one To lock direction.

8. Hand tool system at least according to claim 6, characterized in that the anti-rotation element (28c-f; 28h, 30h; 28i, 30i, 32i; 28-k) at least partially integral with a closure unit (20c-f; 20h) and / or a Protective hood (22-k) of the protective hood unit (14c-f; 14h-k) is formed.

9. hand tool system at least according to claim 6, characterized in that the closure unit (20e-g) at least one closure element (46e-g), on which the anti-rotation element (28e-g) is arranged.

10. Hand tool system at least according to claim 6, characterized in that the anti-rotation element (28a, 30a, 32a, 28b, 28g, 281-n) movable on a

Locking unit (20a-b; 20g) and / or on a protective hood (221-n) of the protective hood unit (14a-b; 14g, 141-n) is mounted.

11. Hand tool system at least according to claim 10, characterized in that the anti-rotation element (28a, 30a, 32a, 28b, 28n) at least partially about a pivot axis (50a-b, 5On) is rotatably mounted.

12. Hand tool system at least according to claim 6, characterized in that the Schutzauaubenverdrehsicherungseinheit (16a-b; 16h; 16n) at least one lever element (52a-b; 52h; 52n), on which the anti-rotation element (28a, 30a, 32a, 28b; 34h, 28n) is at least partially arranged.

13. Hand tool system at least according to claim 12, characterized in that the lever element (52a-b; 52h; 52n) is mounted at least partially rotatably on the hand-held power tool (12h) and / or on the protective hood unit (14a-b; 14n).

14. Hand tool system at least according to claim 6, characterized in that the guard rotation preventing unit (16a-b; 16i; 161-n) at least one moving element (54a-b; 54i; 541-n), the anti-rotation element (28a, 30a, 32a 28b, 28m, 281, 28m, 30m, 32m, 28n) upon reaching the working position of the protective hood unit (14a-b, 14i, 141-n) is moved to an anti-rotation position.

15. Hand tool system according to claim 14, characterized in that the movement element (54a-b; 54i; 541-n) is formed by a spring element (56a-b; 56i; 561-n).

16. A handheld power tool system according to claim 6, characterized in that the guard anti-rotation lock unit (16a-b; 16h; 161-n) has at least one unlocking element (58a-b; 58h; 581-n) which can be moved to move the anti-rotation element (16a-b; 28a, 30a, 32a, 28b, 34h, 281, 28m, 30m, 32m, 28n) is provided from the anti-rotation position.

17. Hand tool system at least according to claim 16, characterized in that the unlocking element (58a-b; 581-n) is mounted at least partially movable on the protective hood unit (14a-b; 141-n).

18. Hand tool system at least according to claim 16, characterized in that the unlocking element (58a-b; 58h; 581-n) at least partially integral with the anti-rotation element (28a, 30a, 32a; 28b; 34h; 281; 28m, 30m, 32m; 28n) is formed.

19. Hand tool system at least according to claim 6, characterized in that the hand tool (12a-n) has a receiving unit (60a-n) for receiving a tool (18a-n) on which the anti-rotation element (34a-n; 36a-g; 36i-j; 361-n).

20. Hand tool system at least according to claim 19, characterized in that arranged on the receiving unit (60h) anti-rotation element (34h) is movably arranged on the receiving unit (60h).

21. Hand tool system at least according to claim 19, characterized in that arranged on the receiving unit (60a-g; 60i-n) anti-rotation element (34a-n; 36a-g; 36i-j; 361-n) at least partially integral with the receiving unit (60a-g; 60i-n) is formed.

22. Hand tool system according to one of the preceding claims, characterized in that the guard rotation preventing unit (16a; 16h-i; 16m) at least two anti-rotation elements (28a, 30a, 32a; 28h, 30h; 28i, 30i, 32i; 28m, 30m, 32m) arranged in a circumferential direction (62a, 64a; 62h-i, 64h-i; 62m, 64m) one after the other on the protective hood unit (14a; 14h-i; 14m).

23. Hand tool system according to one of the preceding claims, characterized in that the guard rotation preventing unit (16a-g; 16i-j; 161-n) at least two anti-rotation elements (34a-g, 36a-g; 34i-j, 36i-j; 341- n, 361-n) arranged in a circumferential direction (62a-g, 64a-g; 62i-j, 64i-j; 621-n, 641-n) successively on the hand tool (12a-g; 12i-j; 121-n) are arranged.