Hand-held tool

Abstract

The invention relates to a hand-held power tool, in particular an angle grinder, comprising - a case (2), - a drive motor (3) arranged in the housing (2) for driving a tool (4), - a boom (10) with a fastening section (11) for fastening the boom (10) to the housing (2), wherein the boom (10) has a distal end (13) on which the tool (4) can be arranged, and - a front handle (20) for guiding the work device (1), wherein the front handle (20) has a mounting section (21), characterized in that the work device (1) has a fastening unit (30) by means of which the boom (10) is jointly fixed to the housing (2) via its fastening section (11) and the front handle (20) via its mounting section (21).

Description

[0001] The invention relates to a hand-held work device according to the features of the preamble of claim 1.

[0002] Hand-held power tools, particularly angle grinders, are known, comprising a housing and a drive motor arranged within the housing for driving a tool. These tools further comprise a boom with a mounting section for attaching the boom to the housing of the power tool. The boom has a distal end at which the tool is located. The power tool also has a front handle for guiding the tool, the front handle having a mounting section by which it is attached to the housing.

[0003] Disadvantages of such work equipment often include the handling of the equipment for the operator and its complex design, which can lead to increased costs.

[0004] It is therefore an object of the invention to provide a hand-held work device that offers good handling for the operator and at the same time a simpler overall design.

[0005] The problem is solved by a hand-held tool according to the features of claim 1.

[0006] The hand-held tool according to the invention, in particular an angle grinder, comprises a housing, a drive motor arranged in the housing for driving a tool, a boom with a mounting section for attaching the boom to the housing, the boom having a distal end on which the tool can be positioned, and a front handle for guiding the tool, the front handle having a mounting section. Furthermore, the tool has a fastening unit by means of which the boom and the front handle are jointly fixed to the housing via the mounting section.

[0007] The mounting unit is designed such that both the boom and the front handle are secured to the housing by means of it. Thus, the boom and the front handle are attached to the housing via the same mounting unit. This ensures a compact design of the tool. Cut-off saws known from the prior art have a front handle that extends over the boom and is positioned at a distance from it on the housing. When making a horizontal cut, the operator of the tool according to the invention can perform a cut closer to the ground, since the front handle rests against the boom itself or against the housing in the area of ​​the boom. When the operator performs a vertical cut, this can be carried out closer to the wall.

[0008] Furthermore, by using a single mounting unit to attach the front handle and the extension arm to the housing, a separate mounting unit can be omitted. This saves on components, resulting in reduced component complexity and simplified assembly.

[0009] The boom is preferably designed to be displaceable relative to both the housing and the front handle. It is preferably provided that the mounting unit has a first, released position and a second, fixed position. For the boom to be displaced along its longitudinal axis, the mounting unit must be in the first position. In the second, fixed position of the mounting unit, the boom is fixed to the housing. This allows a drive belt, intended for driving the tool held on the boom, to be tensioned or released. If the mounting unit consists, for example, of mounting screws, it is sufficient to simply loosen the screws to release their clamping effect. Even in this position of the mounting unit, the boom can be displaced relative to both the housing and the front handle.If the mounting screws are tightened, the boom cannot be moved. When the mounting screws are tightened, the mounting unit is in the second, fixed position. It may be possible for the boom and / or the front grab handle to be attached to the housing using additional fasteners. However, if the individual fastener does not serve to secure both the boom and the front grab handle to the housing, then that fastener is not part of the mounting unit.

[0010] It is advantageously provided that the fastening unit comprises at least one first fastening element that projects through a first opening in the boom and a first mounting opening in the front handle. Preferably, the first mounting opening of the front handle is designed as a round hole. Advantageously, the first opening of the boom is designed as an elongated hole. The elongated hole allows the boom to be moved relative to the housing in the first, released position of the fastening unit. However, even in the first, released position of the fastening unit, the front handle cannot be moved relative to the housing in the direction of the longitudinal center axis of the boom, since the round mounting opening does not provide sufficient clearance for moving the front handle.

[0011] It is specifically provided that the front handle, with its mounting section, is clamped against the boom by means of the fastening unit. In an alternative embodiment of the work device, it may also be provided that the boom is clamped against the front handle by means of the fastening unit. In the preferred embodiment, it is advantageously provided that the boom is clamped against the housing via the front handle and the fastening unit. Accordingly, the boom is clamped, in particular held, between the front handle and the housing.

[0012] It is advantageous for the fastening unit to include at least one screw connection. Advantageously, the fastening unit may include at least two screw connections. A different number of screw connections may also be appropriate. The at least one fastening element of the fastening unit, in particular the at least one screw connection, extends through the first mounting opening of the front handle and the first opening of the extension arm, thereby holding the extension arm and the front handle to the housing by the at least one screw connection of the fastening unit. The at least one fastening element may, for example, be designed as a stud or as a screw. Preferably, in the second position of the fastening unit, a force is transmitted via the at least one screw connection to the front handle, and from the front handle to the extension arm, and from the extension arm to the housing.

[0013] The working device preferably includes a cover that covers the mounting section of the boom and the mounting section of the front handle, the cover preferably being held to the housing by the fastening unit, in particular by the at least one screw connection of the fastening unit. Thus, in addition to the front handle and the boom, another component of the working device, namely the cover, is held to the housing by only this one fastening unit. This eliminates the need for additional fastening elements.

[0014] Preferably, a gripping section for the front handle is formed adjacent to the mounting section, and in particular adjacent to the mounting opening of the mounting section. The gripping section of the front handle preferably borders directly on the mounting section of the front handle. This gripping section is thus formed on a first longitudinal outer surface of the tool and enables horizontal cuts to be made with the tool when gripping the front handle. This improves the handling of the tool for the operator and expands its range of applications.

[0015] Exemplary embodiments of the invention are explained below with reference to the drawing. The drawing shows: Fig. 1 in a perspective view an embodiment of the hand-held work device according to the invention, Fig. 2 in a side view the hand-held work tool after Fig. 1, Fig. 3 in a side view the hand-held work tool according to Fig. 1 with the cover removed, Fig. 4 in a partial, enlarged side view the fastening unit with the front handle and the boom, Fig. 5 in a partial, perspective view of the fastening unit, the front grab handle and the boom from the front, Fig. 6 in a partial, perspective view the fastening unit, the front handle, the boom from the rear, Fig. 7 in a sectional view the fastening unit in a fixed position, Fig. 8 the hand-held work tool after Fig. 1 in a perspective exploded view, Fig. 9 in a partial side view an alternative embodiment of the working device according to the invention with a cover of the boom, Fig. 10 in a perspective side view the inside of the cover of the work device according to Fig. 9, Fig. 11 in a perspective side view the assembly section of the front handle with groove of the work tool according to Fig. 9, Fig. 12 in a partial, perspective sectional view, the work tool according to Fig. 9 with the cover fixed by the fastening unit and Fig. 13 in a partial sectional view the work tool according to Fig. 9 with the cover fixed by the fastening unit in the released, first position of the fastening unit.

[0016] Fig. Figure 1 shows an embodiment of the hand-held tool 1 as an angle grinder. The tool 1 is hand-held, in particular hand-carried. During operation, the tool 1 is carried and guided by the operator. The tool 1 has a housing 2. Furthermore, the tool 1 includes a drive motor 3, the drive motor 3 being arranged in the housing 2. The drive motor 3 is as shown in Fig. Figure 1 shows a schematic representation, represented only by a dashed rectangle. In the present embodiment, the drive motor 3 is designed as an electric motor. In an alternative embodiment, the drive motor 3 can also be designed as an internal combustion engine. The working device 1 comprises at least one battery pack 7 for supplying electrical energy to the drive motor 3. The battery pack 7 is in Fig. 2 is represented by a dashed line. Particularly preferably, the working device 1 includes a further battery pack, not shown in detail here, for supplying energy to the drive motor 3. A battery compartment 8 is provided on the housing 2 to accommodate the battery pack 7. The drive motor 3 serves to drive a tool 4 that can be attached to the working device 1. In the present embodiment, the tool 4 is designed as a cutting disc.

[0017] As in the Fig. 1 and Fig. As shown in Figure 2, the housing 2 extends from a rear end 34 to a front end 35. The working device 1 includes a rear handle 5. The rear handle 5 forms the rear end 34 of the housing 2. Furthermore, the working device 1 includes a front handle 20 for guiding the working device 1. The front handle 20 is fixed approximately at the front end 35 of the housing 2. The front handle 20 is preferably designed as a handle tube. Other designs of the front handle 20 are also conceivable.

[0018] As in the Fig. 1 and Fig. As shown in Figure 2, the working device 1 has a control element 6, which is used to control the drive motor 3. The control element 6 is designed as an operating lever. Furthermore, the working device 1 includes a locking element 9, which locks the control element 6 in a locked position and releases it for operation in a released position. The locking element 9 is preferably designed as a locking lever. The locking and releasing functions of the locking element 9 can be performed mechanically and / or electronically, for example, by sensors. The control element 6 and the locking element 9 are located on the rear handle 5. This means that the operator can actuate both the control element 6 and the locking element 9 when gripping the rear handle 5. In the preferred embodiment, the control element 6 and the locking element 9 are arranged on the rear handle 5.

[0019] Preferably, the working device 1 includes a control unit (not shown in detail). The control unit processes signals generated by the operating element 6 and / or the locking element 9 and serves primarily to control the drive motor 3. Other functions of the working device 1 can also be implemented via the control unit.

[0020] As in Fig. As shown in Figure 3, the working device 1 comprises a boom 10. The boom 10 extends along its longitudinal central axis 14 from a proximal end 12 to a distal end 13. The boom 10 is connected via a fastening section 11 ( Fig. 7) fixed to the housing 2. The boom 10 is fixed, in particular, in the area of ​​the front end 35 of the housing 2. The boom 10 projects beyond the front end 35 of the housing 2 and extends with its distal end 13 away from the front end 35 of the housing 2. The tool 4 can be arranged at the distal end 13 of the boom 10. The tool 4 is rotatably mounted at the distal end 13 of the boom 10. During operation of the working device, the tool 4 is rotated by the drive motor 3 in a direction 52 ( Fig. 1 and Fig. 3) Rotating drive.

[0021] As in the Fig. 3 and Fig. As shown in Figure 4, the working device 1 comprises a pulley 53, which is driven by the drive motor 3. The working device 1 also comprises a further pulley (not shown) which is arranged at the distal end 13 of the boom and is rigidly connected to the tool in the direction of rotation 52 of the tool 4. The pulley 53, which is preferably arranged on the housing in the region of the proximal end 12 of the boom, is operatively connected to the further pulley via a belt 54. The belt 54 serves to transmit speed and torque between the drive motor 3 and the tool 4.

[0022] As in the Fig. 1 and Fig. As shown in Figure 2, the working device 1 includes a protective hood 51. The protective hood 51 is attached to the boom 10, specifically to the distal end 13 of the boom 10. The protective hood 51 covers the tool 4 over part of its circumference.

[0023] As in Fig. As shown in Figure 2, the working device 1 comprises a top 44 and a bottom 45, wherein the working device 1 can be placed on the ground 40 on its bottom 45. The top 44 and the bottom 45 are connected to each other by a first longitudinal outer surface 46 and a second longitudinal outer surface 47. Terms that describe sides or other components of the working device 1 by means of spatial specifications, for example "top" and "bottom", generally refer to the Fig. Figure 1 shows the usual storage position of the work tool 1. The usual storage position of the work tool 1 is a position in which the work tool 1 is placed on a flat, horizontal surface. The work tool 1 is supported by feet 55.

[0024] As in the Fig. As shown in Figures 5 to 7, the front handle 20 has a mounting section 21. The front handle 20 is fixed to the housing 2 via this mounting section 21. As shown in Fig. As shown in Figure 8, the front handle 20 extends from its mounting section 21 to a further mounting section 23, by which the front handle 20 is also fixed to the housing 2. The front handle 20 is preferably fixed to the first longitudinal outer side 46 of the housing 2 via its mounting section 21. Preferably, the front handle 20 is fixed to the underside 45 of the working device 1 via its further mounting section 23. Preferably, the two mounting sections 21 and 23 form the respective ends of the front handle 20, which is designed as a handle tube.

[0025] As especially in the Fig. 6 and Fig. As shown in Figure 8, the front handle 20 is attached to the housing 2. The front handle 20 encompasses the housing 2, in particular at least partially the first longitudinal outer side 46, the top 44, and the second longitudinal outer side 47 of the working device 1. The front handle 20 comprises a central retaining section 24 and at least one first lateral retaining section 25. In the preferred embodiment, the front handle 20 also comprises a second lateral retaining section 26. The first lateral retaining section 25 is located adjacent to the mounting section 21 of the front handle 20. The front handle 20 is designed and arranged on the housing 2 such that the operator can grasp the first lateral retaining section 25. The first lateral retaining section 25 runs substantially parallel to, or is oriented towards, the first longitudinal outer side 46 of the working device 1.The central holding section 24 of the front handle 20 adjoins the first lateral holding section 25 of the front handle 20. The central holding section 24 is oriented essentially parallel to the top surface 44 of the housing 2, or rather, facing the top surface 44 of the working tool 1. In the area of ​​the central holding section 24, the front handle 20 runs essentially perpendicular to a tool plane 50 defined by the tool 4. Fig. 8) The second lateral retaining section 26 extends from the central retaining section 24 to the further mounting section 23 of the front handle 20. The second lateral retaining section 26 is essentially parallel to the second longitudinal outer side 47 of the tool 1, or rather, oriented towards the second longitudinal side 47 of the tool 1. The front handle 20 is aligned parallel to the tool plane 50 in the area of ​​the first lateral retaining section 25 and / or the area of ​​the second lateral retaining section 26. The front handle 20 extends essentially in one direction from the underside 45 of the tool 1 to the top 44 of the tool 1 in the area of ​​the first lateral retaining section 25. Connecting the front handle 20 via the mounting section 21 in the area of ​​the first longitudinal outer side 46 of the tool 1 enables a compact design of the tool 1.Nevertheless, the first lateral holding section 25 of the front handle 20 offers the operator the possibility of guiding the working device 1 pivoted on the lateral holding section 25 in order to be able to carry out a horizontal cut.

[0026] As in Fig. As shown in Figure 2, the front handle 20, through its central holding section 24, its first lateral holding section 25, and its mounting section 21, forms a gripping plane 58. The gripping plane 58 is oriented essentially perpendicular to the tool plane 50. The gripping plane 58 lies in front of the overall center of gravity S of the working device 1. The overall center of gravity S of the working device 1 lies between the rear handle 5 and the gripping plane 58 of the front handle 20, measured in the direction of the longitudinal center axis 14 of the boom 10.

[0027] As in the Fig. 5 and Fig. As shown in Figure 6, the front handle 20 has stiffening ribs 27, at least in its mounting section 21. High forces are transmitted between the front handle 20 and the housing 2 via the mounting section 21 of the handle 20. Due to the structural reinforcement of the mounting section 21 by means of the stiffening ribs 27, the front handle 20 can also be made of plastic. In an alternative embodiment, the front handle could also be made of a metal alloy, in particular an aluminum alloy. In such an embodiment, additional stiffening of the mounting section 21 can be omitted. In the preferred embodiment, however, the front handle 20 is made of plastic.

[0028] In Fig. Figure 7 shows a sectional view illustrating the connection of the front handle 20 and the extension arm 10 to the housing 2 of the work tool 1. The extension arm 10 is fixed to the housing 2 via its mounting section 11. The extension arm 10 makes contact with the housing 2 via the mounting section 11. The extension arm 10 is directly attached to the housing 2. The front handle 20 rests against the extension arm 10 via its mounting section 21. The front handle 20 makes contact with the extension arm 10 via its mounting section 21. In the area of ​​the mounting section 21, the front handle 20 is only indirectly attached to the housing 2.

[0029] To attach the boom 10 and the front handle 20 to the housing 2, the working device 1 includes a fastening unit 30. In the present embodiment of the working device 1, the boom 10 is slidably mounted on the housing 2 in the direction of its longitudinal center axis 14. The movement of the boom 10 serves to tension and release the belt 54. For this purpose, the fastening unit 30 has a first, released position and a second, fixed position. To move the boom 10 in the direction of its longitudinal center axis 14, the fastening unit 30 must be in the first, released position.

[0030] As in the Fig. As shown in Figures 3 to 6, the working device 1 in the present embodiment includes an additional fastening element 60. The boom 10 is attached to the housing 2 outside its mounting section 11 by means of the additional fastening element 60. Therefore, in order to move the boom 10 relative to the housing 2, both the fastening unit 30 and the additional fastening element 60 must be loosened. The front handle 20, however, is not movable in the first, loosened position of the fastening unit 30. In an alternative embodiment, the boom 10 may also be held to the housing 2 only by the fastening unit 30. In such a embodiment, it is of course sufficient to move the boom 10 relative to the housing 2 only if the fastening unit 30 is loosened.

[0031] The additional fastening element 60 is preferably designed as a screw connection. In this case, the screw connection consists of a stud bolt that is fixed in the housing 2 and projects through an opening 61 in the arm 10, and a nut that is screwed onto the stud bolt and clamps the arm 10 against the housing 2. Alternatively, the screw connection can also be designed as a screw that is screwed into the housing 2. The fastening element 60 is located at the proximal end 12 of the arm. The opening 61 of the arm 10 is designed as an elongated hole to allow the arm 10 to slide along its longitudinal center axis 14. The front grab handle 20 is not held to the housing 2 by means of the additional fastening element 60. Therefore, the additional fastening element 60 is not part of the fastening unit 30.

[0032] In the second, fixed position of the fastening unit 30, the boom 10 and the front handle 20 are fixed to the housing 2. In this second, fixed position of the fastening unit 30, the boom cannot be moved along its longitudinal axis 14. However, for the operation of the work tool 1, the additional fastening element 60 for securing the boom 10 to the housing 2 must also be engaged.

[0033] The fastening unit 30 comprises, as particularly shown in the Fig. 7 and Fig. Figure 8 shows at least one first screw connection 31. The fastening unit 30 particularly preferably comprises a second screw connection 31'. A different number of screw connections may also be advantageous. In the preferred embodiment, the screw connections 31, 31' are formed by studs 32, 32' screwed into the housing 2, which have a thread at their end facing away from the housing 2 for screwing on a nut 33, 33'. In an alternative embodiment, the screw connection can also be formed by screws screwed into the housing 2.

[0034] As in Fig. As shown in Figure 7, the boom 10 includes a first opening 15 in its mounting section 11, through which the mounting unit 30 projects. The boom 10 also includes a second opening 16, through which the mounting unit 30 also projects. As shown in the preferred embodiment, the first screw connection 31, in particular the first stud 32, projects through the first opening 15 of the boom 10. Furthermore, the second screw connection 31', in particular the second stud 32' of the mounting unit 30, projects through the second opening 16 of the boom 10. The openings 15, 16 of the boom 10 are designed as elongated slots, allowing the boom 10 to be displaced in the direction of its longitudinal center axis 14 when the screw connections are loosened, in order to tension the belt 54.

[0035] As in Fig. As shown in Figure 7, the front handle 20 comprises a first mounting opening 22 at its mounting section 21, through which the fastening unit 30, in particular the first screw connection 31, and in particular the first stud 32 of the fastening unit 30, projects. Furthermore, the front handle 20 comprises a second mounting opening 28 at its mounting section 21, through which the fastening unit 30, in particular the second screw connection 31', and in particular the second stud 32', projects. Each screw connection 31, 31' includes a nut 33, 33', which is screwed onto the end of the stud 32, 32' facing away from the housing 2 and is preferably screwed directly against the front handle 20.

[0036] As in Fig. As shown in Figure 7, the fastening unit 30 has at least one first fastening element 36 that projects through the first opening 15 of the boom 10 and simultaneously through the first mounting opening 22 of the front handle 20. In this case, the first fastening element 36 of the fastening unit 30 is configured as the first stud 32. Furthermore, the fastening unit 30 has a second fastening element 36' that projects through the second opening 16 of the boom 10 and simultaneously through the second mounting opening 28 of the front handle 20. In this case, the second fastening element 36' of the fastening unit 30 is configured as the second stud 32'. The first fastening element 36 of the fastening unit 30 and / or the second fastening element 36' can each also be configured as a screw or as another suitable component.

[0037] As particularly in Fig. As shown in Figure 6, the first mounting opening 22 and the second mounting opening 28 of the front handle 20 are designed as round holes. Therefore, displacement of the front handle 20 relative to the housing 2, particularly in the direction of the longitudinal center axis 14 of the boom 10, is not permitted, even in the first, released position of the fastening unit 30. The first opening 15 and the second opening 16 of the boom 10 are preferably each designed as an elongated hole. The longitudinal orientation of the elongated holes corresponds to the direction of the longitudinal center axis 14 of the boom 10. The elongated holes allow the boom 10 to be displaced in the direction of its longitudinal center axis 14, provided that the fastening unit 30 is in the first, released position and, in this case, the additional fastening element 60 is also released.

[0038] As in Fig. As shown in Figure 7, the front handle 20 comprises an insert ring 29, 29' for each mounting opening 22, 28 in the mounting section 21. The insert ring 29, 29' is preferably made of a metal alloy. The insert ring 29, 29' is preferably cast into the front handle 20. The screw connection 31, 31', in particular the nut 33, 33', preferably acts on the insert ring 29, 29'. The insert ring 29, 29' allows the transmission of high forces compared to a support for the front handle 20 made solely of plastic.

[0039] The force flow 41 that arises in the second, fixed position of the fastening unit 30 between the fastening unit 30 and the housing 2 is described in more detail below: The stud bolt 32, 32' of the fastening unit 30 is firmly connected to the housing 2 at one end, preferably screwed into the housing 2. The extension arm 10 rests against the housing 2. The extension arm 10, with its fastening section 11, contacts a bearing surface 42 of the housing 2. The bearing surface 42 of the housing 2 is located adjacent to the stud bolt 32, 32'. The bearing surface 42 is formed by a projection on the housing 2. On the side of the arm 10 facing away from the housing 2, its fastening section 11 contacts the mounting section 21, in particular the insert ring 29, 29', of the front handle 20. The nut 33, 33' of the screw connection 31, 31' is screwed onto the stud 32, 32' and tightened against the front handle 20, in particular against the insert ring 29, 29'. The front handle 20 is thus tightened directly against the arm 10, and the arm 10 against the housing 2.The boom 10 and the front handle 20 are held to the housing 2 by means of the same fastening unit 30, in particular the same fastening means 36, 36'. The force flow 41 runs from the housing 2 through the studs 32, 32' to the nut 33, 33'. From the nut 33, 33', the force flow 41 is transferred to the front handle 20, in particular to the insert ring 29, 29'. From the front handle 20, the force flow 41 runs via the boom 10 back into the housing 2.

[0040] In a particularly preferred embodiment of the work device 1, the housing 2 comprises a motor mounting plate 56 and an enclosure 57. The drive motor 3 is attached to the motor mounting plate 56. The motor mounting plate 56 is preferably made of a metal alloy, in particular a magnesium alloy. This gives it particularly high component stiffness. The motor mounting plate 56 preferably extends from the rear handle 5 to the front end 35 of the housing 2. The fastening unit 30 preferably acts directly into the motor mounting plate 56. In other words, the studs 32, 32' are screwed into the motor mounting plate 56. The boom 10 is clamped directly against the motor mounting plate 56. Due to the high component stiffness of the motor mounting plate 56, high forces and moments can be transmitted between the front handle 20, the boom 10, and the motor mounting plate 56.The housing 57 is also connected to the motor mounting plate 56 and essentially surrounds it. The drive motor 3 is also enclosed by the housing 57. The housing 57 is preferably made of a material whose modulus of elasticity is lower than that of the motor mounting plate 56. The housing 57 is preferably made of a plastic.

[0041] As in Fig. As shown in Figure 8, the working device 1 comprises a cover 70 that covers the boom 10, in particular the mounting section 11 of the boom 10. Preferably, the cover 70 is designed such that it also covers the front handle 20, in particular the mounting section 21 of the front handle 20. The cover 70 is preferably made of a plastic. In an alternative embodiment, the cover 70 can also be made of a metal material. The cover 70 comprises a rear cover 71 and a front cover 72. Both covers 71 and 72 are detachably held to the boom 10. The rear cover 71 is also rigidly connected to the housing 2 in the direction of the longitudinal center axis 14 of the boom 10. The rear cover 71 is not designed to be displaceable relative to the housing 2.The additional fastening element 60, comprising a stud bolt and a nut screwed onto the stud bolt, serves to secure the rear cover 71. Of course, the additional fastening element 60 can also consist of other suitable components, such as a screw. The nut clamps the rear cover 71 against the boom 10, in particular against the rear end 34 of the boom 10, and simultaneously clamps the boom 10 against the housing 2. The fastening unit 30 merely projects through openings 74, 74' in the cover 70, without clamping the cover 70 against the housing 2. The front cover 72 is held on the boom 10 so as to be slidable in the direction of the boom's longitudinal center axis 14. If the boom 10 itself is displaced in the direction of its longitudinal center axis 14 relative to the housing 2, the front cover 72 can be displaced with the boom 10 relative to the housing 2.To prevent a gap from forming between the rear cover 71 and the front cover 72, at least one of the two covers 71, 72, in this case the front cover 72, has an overlap area 73. The overlap area 73 is at least partially covered by the rear cover 71. The overlap area 73 is designed such that the rear cover 71 and the front cover 72 overlap over the entire displacement range of the boom 10 and the associated displacement of the front cover 72.

[0042] In the Fig. Figures 9 to 12 show another version of the working device 1, which differs from the version according to the Fig. Parts 1 to 8 differ only in the design of cover 70 and its fastening. The same reference numerals denote identical components.

[0043] In the Fig. 9 and Fig. Figure 10 shows a retaining lip 75, 75'. Such a retaining lip 75, 75' is formed at the first opening 74 and at the second opening 74' of the cover 70, in particular the rear cover 71. The retaining lip 75, 75' extends from the first opening 74 and the second opening 74', respectively, towards the housing 2 and the extension 10. The retaining lip 75, 75' is web-shaped and has a hook-like projection 76 at its end. The retaining lip 76 projects towards the opening axis 77, 77' of the respective opening 74, 74'. Fig. Figure 11 shows the mounting section 21 of the front grab handle 20. A first groove 78 is provided in the first mounting opening 22 of the mounting section 21 of the front grab handle 20, which is designed to receive the retaining lip 75, 75' on the first opening 74 of the extension 70. A second groove 78' is provided in the second mounting opening 28 of the mounting section 21 of the front grab handle 20, which is designed to receive the retaining lip 75' on the second opening 74' of the extension 70.

[0044] As in Fig. As shown in Figure 12, the fastening unit 30, in particular the nut 33, 33' of the fastening unit 30, engages the retaining lip 75 at the respective opening 74, 74' of the cover 70. The retaining lip 75 is thereby held between the front handle 20 and the fastening unit 30, in particular the nut 33, 33' of the fastening unit 30, preferably in a form-fitting manner. As shown in Fig. As can be seen in Figure 12, a clearance is provided between the retaining lip 75 and the nut 33, 33', ensuring residual contact between the nut 33, 33' and the insert ring 29, 29' of the front handle 20. Consequently, the clamping force emanating from the nut 33, 33' is transmitted to the arm 10 only via the insert ring 29, 29', and not via the retaining lip 75. Furthermore, the front handle 20 is only negligibly weakened structurally by the web-like retaining lip 75, 75'. The groove 78 required to accommodate the retaining lip 75, 75' results in only a slight structural weakening of the wall thickness of the front handle 20, whereas a retaining lip that completely encompassed the mounting openings 22, 28 would lead to a significantly greater structural weakening of the front handle 20.In an alternative design, it may also be advantageous for the retaining lip 75 to be held between the boom 10 and the front handle 20.

[0045] Thus, another component of the work device, namely the cover 70, is held to the housing 2 by only one fastening unit 30, in addition to the front handle 20 and the boom 10. This eliminates the need for additional fastening elements.

[0046] In Fig. Figure 13 shows the fastening unit 30 of the working device 1 in its first, loosened position. The nuts 33, 33' are loosened, i.e., the nuts 33, 33' are positioned on the studs 32, 32', but do not contact either the insert ring 29, 29' or the front handle 20. Furthermore, the nuts 33, 33' also do not contact the retaining lips 75, 75' of the cover 70. In this state, displacement of the boom 10 in the direction of its longitudinal center axis 14 is possible.

Claims

[1] Hand-held power tool, in particular angle grinder, comprising - a case (2), - a drive motor (3) arranged in the housing (2) for driving a tool (4), - a boom (10) with a fastening section (11) for fastening the boom (10) to the housing (2), wherein the boom (10) has a distal end (13) on which the tool (4) can be arranged, and - a front handle (20) for guiding the work tool (1), wherein the front handle (20) has a mounting section (21), characterized by , that the working device (1) has a fastening unit (30) by means of which the boom (10) is jointly fixed to the housing (2) via its fastening section (11) and the front handle (20) via its mounting section (21). [2] Working tool according to claim 1, characterized by, that the fastening unit (30) has a first, released position and a second, fixed position, wherein the fastening unit (30) must be in the first position to displace the boom (10) in the direction of its longitudinal central axis (14), and wherein in the second, fixed position of the fastening unit (30) the boom (10) is fixed to the housing (2). [3] Working equipment according to claim 1 or 2, characterized by , that the fastening unit (30) comprises at least one fastening element (36) which extends through a first opening (15) of the boom (10) and a first mounting opening (22) of the front grab handle (20). [4] Working equipment according to claim 3, characterized by , that the first mounting opening (22) of the front handle (20) is designed as a round hole. [5] Working equipment according to claim 3 or 4, characterized by , that the first opening (15) of the boom (10) is designed as an elongated hole. [6] Working device according to any one of claims 1 to 5, characterized by , that the front handle (20) with its mounting section (21) is clamped against the boom (10) by means of the fastening unit (30). [7] Working device according to any one of claims 1 to 6, characterized by , that the boom (10) is tensioned against the housing (2) via the front handle (20) through the fastening unit (30). [8] Working device according to any one of claims 1 to 7, characterized by , that the fastening unit (30) comprises at least one screw connection (31, 31'), in particular at least two screw connections (31, 31'). [9] Working tool according to claim 8, characterized by , that in the second position of the fastening unit (30) a force flow runs via the at least one screw connection (31, 31') into the front handle (20), from the front handle (20) into the boom (10) and from the boom (10) into the housing (2). [10] Working device according to any one of claims 1 to 9, characterized by , that the working device (1) comprises a cover (9) which covers the fastening section (11) of the boom (10) and the mounting section (21) of the front handle (20), wherein the cover (9) is preferably held by the fastening unit (30), in particular by the at least one screw connection (31, 31') of the fastening unit (30) to the housing (2). [11] Working device according to any one of claims 1 to 10, characterized by , that adjacent to the mounting section (21), in particular adjacent to the mounting opening (22) of the mounting section (21), of the front handle (20) a holding section for gripping the front handle (20) is formed.

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