Hand-held work tool with protective hood

Abstract

Hand-held work equipment including, a housing (2), a motor support unit (10) formed separately from the housing (2), which is connected to the housing (2), a drive motor (3) arranged in the housing (2) for driving a tool (5) rotating about a rotary axis (8), wherein the drive motor (3) is attached to the motor support unit (10), a protective hood (51), wherein the protective hood (51) at least partially covers the tool (5), wherein a stop (110) is provided on the protective hood (51), wherein the working device (1) comprises a counter stop (120) which is provided for operative connection with the stop (110) of the protective hood (51) in order to limit the pivoting movement of the protective hood (51) to an end position (131), characterized in that the counter stop (120) is formed, in particular directly, on the motor support unit (10) and that the motor support unit (10) is a component of particularly high strength and stiffness.

Description

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

[0002] A hand-held power tool, in particular an angle grinder, is known, comprising a housing and a motor support unit separately formed from the housing, the motor support unit being connected to the housing. Furthermore, such a power tool includes a drive motor arranged in the housing for driving a cutting disc rotating about a rotary axis. The drive motor is attached to the motor support unit. The cutting disc is partially covered by a protective hood.

[0003] From DE 10 2012 103 663 A1, an angle grinder with a protective guard is known. The angle grinder comprises a boom at one end of which a cutting disc is held. The protective guard is arranged such that it at least partially covers the cutting disc. Two stops are formed on the protective guard. The boom of the angle grinder forms the counter-stop and, in conjunction with the two stops, limits the possible rotational movement of the protective guard.

[0004] One of the normative requirements for such a tool is a so-called burst test. In a burst test, a scenario is simulated in which the cutting disc breaks into several pieces during operation and is caught by the protective guard. Standards stipulate that the protective guard must absorb the kinetic energy of the cutting disc fragments, while its freedom of movement is limited.

[0005] It is therefore an object of the invention to provide a hand-held working device that reliably absorbs the kinetic energy of individual cutting disc parts entering the protective hood via the protective hood and that reliably dissipates the kinetic energy of the protective hood.

[0006] This problem is solved by a generic hand-held tool according to the features of claim 1.

[0007] The working device according to the invention comprises a housing, a motor support unit separately formed from the housing and connected to the housing, a drive motor arranged in the housing for driving a tool rotating about a rotary axis, the drive motor being attached to the motor support unit, a protective hood, the protective hood at least partially covering the tool, a stop being provided on the protective hood, and a counter-stop being formed on the motor support unit, which is provided for operative connection with the stop of the protective hood in order to limit the pivoting movement of the protective hood to an end position. The counter-stop is formed on the motor support unit, in particular directly.

[0008] The motor support unit of the hand-held tool according to the invention is a component of particularly high strength and rigidity. This ensures that the drive motor, which is attached to the motor support unit, exhibits sufficient concentricity. The design of the counter-stop on the motor support unit ensures that high forces and torques originating from the protective hood can be transmitted to the motor support unit via the stop and the counter-stop. The design of the counter-stop on the motor support unit allows the kinetic energy of the tool components, particularly the cutting disc, housed within the protective hood to be transferred to the motor support unit.

[0009] It is specifically provided that the protective hood is pivotably mounted about the axis of rotation of the tool, and that the maximum pivot angle of the protective hood from the end position to the open position is less than or equal to 90°, and in particular less than 60°. In the end position of the protective hood, the stop of the protective hood and the counter-stop on the motor support unit contact each other. If the protective hood pivots when the tool bursts, it is stopped in its end position by the interaction of the stop and counter-stop. The movement of the protective hood from the open position to the end position beyond the end position is blocked by the stop and counter-stop. The maximum pivot angle of the protective hood from the end position to the open position is in particular at least 30°.

[0010] It is specifically designed that the counter-stop is integrally formed with the motor mounting unit. The counter-stop and the motor mounting unit therefore constitute a single component. The motor mounting unit is preferably designed as a cast component. The motor mounting unit is preferably made of a metal alloy, particularly a magnesium alloy. This allows for high component strength.

[0011] It is advantageously provided that the counter-stop has a load-bearing structure. This load-bearing structure extends, in particular, from a stop surface tangentially to the direction of rotation of the tool into a base body of the motor support unit. Thus, upon impact of the stop and counter-stop, the forces can be transferred to the motor support unit via the load-bearing structure in their direction of action. The force flow therefore does not undergo any deflections but is guided along the shortest path from the stop surface of the counter-stop to the motor support unit. This enables the counter-stop to absorb high forces.

[0012] It is specifically intended that the protective cover be made of a metal alloy, with the stop cast onto the protective cover. This one-piece design of the protective cover and stop allows for high component strength, enabling the transmission of high forces and moments from the protective cover, via the stop and counter-stop, to the motor mounting unit.

[0013] Preferably, the working tool has a first stop surface formed on the stop of the protective hood and a second stop surface formed on the counter-stop, wherein, upon contact between the stop and counter-stop, the first stop surface and the second stop surface touch in a common contact area. The first stop surface and the second stop surface are designed such that they make contact over their entire surface area upon mutual contact. This minimizes the surface pressure occurring on the stop surfaces to prevent damage to the components. It is particularly provided that the contact surface defines a contact plane, and that the contact plane intersects the tool at a contact line along a tool circumference and forms an angle with a tangent plane of the tool that touches the tool at the contact line. This angle is open in the direction of rotation of the tool.The angle is specifically less than or equal to 90°, and particularly less than 80°. This causes the stop and counter-stop to interlock. In other words, the stop and counter-stop interlock. This ensures that the stop on the protective cover does not slip off the counter-stop on the motor support unit. The movement of the protective cover can thus be reliably stopped. The angle is specifically greater than 55°, particularly greater than 65°, and particularly greater than 70°. This ensures that the resulting wedge effect, i.e., the force components perpendicular to the surface normal of the contact area, does not become too large and damage the stop or counter-stop. Furthermore, notch effects can also occur, which are exacerbated by an excessively acute angle.Particularly advantageous is the contact surface designed parallel to a plane that is spanned by the longitudinal center axis of the boom and by a rotation axis of the tool.

[0014] It is specifically designed that the counter-stop is wider than the stop in the direction of the tool's axis of rotation. In the event of tool breakage, the guard may deform and / or oscillate in the direction of the tool's axis of rotation when collecting the individual tool fragments. Consequently, the position of the guard may change in a direction perpendicular to the tool plane. The wide design of the counter-stop ensures that the entire first contact surface of the stop remains in contact with the second contact surface of the counter-stop, even when the position changes in the direction of the tool's axis of rotation. Thus, optimal force transmission between the stop and the counter-stop is guaranteed even in the event of breakage.

[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. Tool-free and partially without covering the boom, Fig. 4 in a partial side view the boom of the work device according to Fig. 1 with pulley and belt, Fig. 5 in a top view a sectional view of the working device according to the invention. Fig. 1, Fig. 6. A cross-sectional view of the work tool from above. Fig. 1 along the mounting points of the housing to the motor mounting unit, Fig. 7. A cross-sectional view of the work tool from the rear. Fig. 1, Fig. 8 in a perspective view from behind the engine mounting unit of the work machine Fig. 1, Fig. 9 in a perspective view from the front, the engine mounting unit of the work machine Fig. 1, Fig. 10 in a top view the motor support unit of the work equipment according to Fig. 1, Fig. 11 in a view from below the motor support unit of the work equipment after Fig. 1, Fig. 12 in a side view, perspective view, the work tool according to Fig. 1 in the open position of the protective hood, Fig. 13 in a side view, perspective view, the tool according to Fig. 1 in the final position of the protective hood, Fig. 14 in a side view the work tool according to Fig. 1 with a schematically depicted protective hood in the open and closed positions, Fig. 15 in a representation from below, the work tool after Fig. 1 and Fig. 16 in a side view, enlarged, stop and counter stop of the working device according to Fig. 1 in contact.

[0016] Fig. Figure 1 shows an embodiment of the hand-held tool 1 as an angle grinder. The tool 1 can alternatively also be designed as a chainsaw or other tool. 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 ( Fig. 5), wherein the drive motor 3 is arranged in the housing 2. In Fig. Figure 1 shows the drive motor 3 schematically as a dashed rectangle. In the present embodiment, the drive motor 3 is an electric motor. In an alternative embodiment, the drive motor 3 can also be an internal combustion engine. The drive motor 3 serves to drive a tool 5 that can be attached to the working device 1. In the present embodiment, the tool 5 is a cutting disc.

[0017] As in the Fig. 5 and Fig. As shown in Figure 6, the working device 1 comprises at least one battery pack 7 for supplying electrical power to the drive motor 3. Particularly preferably, the working device 1 comprises a further battery pack 7' for supplying power to the drive motor 3. A receiving housing 20 is provided for receiving the at least one battery pack 7 and / or the further battery pack 7'. The receiving housing 20 is arranged on the housing 2, and in particular fixed to it. In the present embodiment of the working device 1, the receiving housing 20 is designed as a separate component from the housing 2. In an alternative embodiment, the receiving housing 20 and the housing 2 can also be formed as a single piece, in particular the receiving housing 20 being an integral part of the housing 2. The receiving housing 20 comprises a first receptacle 21 for receiving the at least one battery pack 7. Furthermore, the receiving housing 20 comprises a second receptacle 22 for receiving the further battery pack 7'.The battery packs 7, 7' can be removed from the mounting housing 20, in particular from the receptacles 21, 22, without tools. To attach the battery packs 7, 7' to the working device 1, they are inserted into the mounting housing 20, in particular into the receptacles 21, 22, and locked into place. The locking mechanism can be released without tools, and the battery packs 7, 7' can be removed from the mounting housing 20, in particular from the receptacles 21, 22, for example, for charging or simply for replacement. Alternatively, the battery packs 7, 7' can be designed as sled-type battery packs.

[0018] As in the Fig. 1 and Fig. As shown in Figure 2, the working device 1 comprises a rear handle 53. Furthermore, the working device 1 comprises a front handle 54. The front handle 54 is preferably designed as a handle tube. Other designs of the front handle 54 may also be advantageous. The housing 2 extends from a rear end 35 to a front end 36. In this case, the rear handle 53 forms the rear end 35 of the housing 2. In an alternative embodiment, the rear handle 53 may also be designed separately from the housing 2. In such an embodiment, the rear handle 53 is arranged in the region of the rear end 35 of the housing 2. The front handle 54 is arranged in the region of the front end 36 of the housing 2.

[0019] Furthermore, the working device 1 has a control element 6, which is provided for controlling the drive motor 3. The control element 6 is designed as an operating lever. The control element 6 is associated with the rear handle 53. The working device 1 also includes a locking element 9, which locks the control element 6 in a locked position and releases the control element 6 for operation in a release position. The locking element 9 is preferably designed as a locking lever. The locking and release functions of the locking element 9 can be implemented mechanically and / or electronically, for example, by sensors. The locking element 9 is associated with the rear handle 53. This means that the operator can actuate both the control element 6 and the locking element 9 when gripping the rear handle 53. In a preferred embodiment, the control element 6 and the locking element 9 are arranged on the rear handle 53.

[0020] Particularly preferably, the working device 1 comprises 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 essentially to control the drive motor 3. Other functions of the working device 1 can also be implemented via the control unit.

[0021] As in Fig. As shown in Figure 3, the working device 1 comprises a boom 30. The boom 30 extends along its longitudinal central axis 34 from a proximal end 32 to a distal end 33. The boom 30 is fixed, at least indirectly, to the housing 2. In particular, the boom 30 is fixed indirectly to the housing 2 in the region of the front end 36 of the housing 2. The boom 30 projects beyond the front end 36 of the housing 2 and extends with its distal end 33 away from the front end 36 of the housing 2. The tool 5 can be arranged at the distal end 33 of the boom 30. The tool 5 is rotatably mounted at the distal end 33 of the boom 30. During operation of the working device 1, the tool 5 is rotated by the drive motor 3 in a direction 52 ( Fig. 1 and Fig. 3) Rotating drive.

[0022] As in the Fig. 3 and Fig. As shown in Figure 4, the working device 1 comprises a pulley 55, 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 33 of the boom 30 and is rigidly connected to the tool 5 in the direction of rotation 52 of the tool 5. The tool 5 and the further pulley are, of course, removable, allowing them to be replaced individually. The pulley 55, which is preferably arranged on the housing 2 in the region of the proximal end 32 of the boom 30, is operatively connected to the further pulley via a belt 56. The belt 56 serves to transmit speed and torque between the drive motor 3 and the tool 5.

[0023] 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 30, specifically to the distal end 33 of the boom 30. The protective hood 51 covers the tool 5 over part of its circumference.

[0024] 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 a base 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 2 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 57.

[0025] As in the Fig. 5, Fig. 6 to Fig. As shown in Figure 7, the working device 1 comprises a motor support unit 10. The motor support unit 10 is designed separately from the housing 2. The drive motor 3 is preferably directly attached to the motor support unit 10. The housing 2 is also attached to the motor support unit 10.

[0026] As in the Fig. 8 and Fig. As shown in Figure 9, the motor support unit 10 is designed as a motor support plate. The motor support unit 10 has a longitudinal extension. The motor support unit 10 comprises a rear end 27 and a front end 28. The rear handle 53 is arranged at the rear end 27 of the motor support unit 10. The front handle 54 is arranged at the front end 28. The motor support unit 10 has a longitudinal center axis 26 that extends from the rear end 27 of the motor support unit 10 to the front end 28 of the motor support unit 10. The longitudinal center axis 26 lies in a longitudinal plane 61 of the motor support unit 10. The longitudinal plane 61 is aligned parallel to the tool plane 50. In an alternative embodiment of the working tool 1, the longitudinal plane 61 of the motor support unit 10 may also correspond to the tool plane 50.

[0027] As in Fig. As shown in Figure 9, the motor support unit 10 comprises a motor mount 14, which in the present embodiment is designed in particular as a hollow shaft. The motor mount 14, in particular the hollow shaft, has an outer surface 15 and an inner surface 16. The drive shaft 4 of the drive motor 3 is rotatably mounted in the hollow shaft about a pivot axis 41 ( Fig. 5).

[0028] As in Fig. As shown in Figure 5, the drive motor 3, designed as an electric motor, comprises a stator 42 and a rotor 43. The stator 42, which includes a plurality of coils, is arranged directly on the outside 15 of the hollow shaft. The rotor 43, in turn, comprises the drive shaft 4 and a rotor section 58 that overlaps the stator 42. The rotor section 58 is provided with corresponding permanent magnets that interact with the coils of the stator 42. The rotor section 58 and the drive shaft 4 are non-rotatably connected to each other. The rotor 43 is rotatably mounted on the inside 16 of the hollow shaft via its drive shaft 4 by means of two bearings 59, 59'. The electric motor is designed as an external rotor motor. In an alternative embodiment of the working device 1, it may also be advantageous to design the electric motor as an internal rotor motor.

[0029] As in Fig. As shown in Figure 9, the axis of rotation 41 of the drive shaft 4 is oriented approximately perpendicular to the longitudinal plane 61 of the motor support unit 10. The axis of rotation 41 lies within a raised plane 63 of the motor support unit 10. The raised plane 63 of the motor support unit 10 is oriented perpendicular to the longitudinal center axis 26, and in particular perpendicular to the longitudinal plane 61. Furthermore, the motor support unit 10 has a transverse plane 62, which is oriented perpendicular to the raised plane 63 and perpendicular to the longitudinal plane 61.

[0030] As in the Fig. 8 and Fig. As shown in Figure 10, the engine mounting unit 10 has a first longitudinal section 11, a second longitudinal section 12, and a central section 13. The central section 13 is located between the first longitudinal section 11 and the second longitudinal section 12. The first longitudinal section 11 and the second longitudinal section 12 are preferably connected to each other via the central section 13. These sections divide the engine mounting unit 10 in the direction of the longitudinal center axis 26. The first longitudinal section 11 extends from the rear end 27 of the engine mounting unit 10 to the central section 13 of the engine mounting unit 10. The central section 13 of the engine mounting unit 10 extends from the first longitudinal section 11 of the engine mounting unit 10 to the second longitudinal section 12 of the engine mounting unit 10. The second longitudinal section 12 of the engine mounting unit 10 extends from the central section 13 of the engine mounting unit 10 to the front end 28 of the engine mounting unit 10.

[0031] As particularly in Fig. As shown in Figure 10, the central section 13, viewed from above, is approximately Z-shaped in the direction perpendicular to the transverse plane 62 of the motor support unit 10. The central section 13 has a first curvature 91 and a second curvature 92, with the first curvature 91 and the second curvature 92 running in opposite directions to each other. The arrangement of these two curvatures 91, 92 relative to each other gives the central section 13 its approximately Z-shaped contour. The first curvature 91 has a first axis of curvature 93. The second curvature 92 has a second axis of curvature 94. The first axis of curvature 93 of the first curvature 91 and the second axis of curvature 94 of the second curvature 92 are aligned parallel to each other. The motor support unit 10 is therefore only singly curved. The first axis of curvature 93 of the first curvature 91 and the second axis of curvature 94 of the second curvature 92 are aligned perpendicular to the transverse plane 62.

[0032] The first longitudinal section 11 and the second longitudinal section 12 are essentially parallel to each other. Due to the opposing curvatures 91, 92 of the central section 13 of the motor support unit 10, the first longitudinal section 11 and the second longitudinal section 12 are offset from each other in the direction perpendicular to the longitudinal plane 61 of the motor support unit 10. The motor support unit 10 has a first outer surface 17 and a second outer surface 18. The central section 13 of the motor support unit 10 has an offset width a, which is measured in the direction perpendicular to the longitudinal plane 61 of the motor support unit 10 at the first outer surface 17 of the motor support unit 10. The offset width a corresponds to the maximum distance, measured in the direction perpendicular to the longitudinal plane 61, of the respective transition areas of the central section 13 to the first longitudinal section 11 and to the second longitudinal section 12, respectively, on the first outer surface 17.Furthermore, the central section 13 of the motor support unit 10 has a length b measured in the direction of the longitudinal center axis 26, which corresponds to the distance between the first longitudinal section 11 and the second longitudinal section 12. The offset width a of the central section 13 of the motor support unit 10 corresponds to at least 50%, preferably at least 70%, and in particular at least 90% of the length b of the central section 13 of the motor support unit 10. Furthermore, the first longitudinal section 11 has a length c measured in the direction of the longitudinal center axis 26, which corresponds to the distance between the rear end 27 and the central section 13. The offset width a of the central section 13 of the motor support unit 10 corresponds to at least 10%, and in particular at least 20%, of the length c of the first central section 11 of the motor support unit 10.

[0033] As already explained above, the motor support unit 10 is simply curved. This design of the motor support unit 10 allows not only for spatial configurations within the housing interior but also for the formation of a main demolding direction 31. This also corresponds to the direction of the axis of rotation 41. This, in turn, enables the motor mount 14 to be designed as a hollow shaft. The housing interior is bounded by the housing 2. Components with a simple curvature are significantly easier to cast and demold than doubly curved components. The tools required for this can be designed more simply.

[0034] As in the Fig. 6 and Fig. As shown in Figure 8, the working device 1 comprises first fastening units 65, which are provided for fastening the housing 2 to the motor support unit 10. Each first fastening unit 65 comprises a first fastening element 66, which in this case is designed as a screw, and a first fastening receptacle 67, which is designed as an opening with an internal thread for receiving the screw. At least one first fastening receptacle 67, in this case four first fastening receptacles 67, is provided at the rear end 27 of the motor support unit 10. Furthermore, additional first fastening receptacles 67 for connecting the housing 2 to the motor support unit 10 are provided in the central section 13 of the motor support unit 10 and at the front end 28 of the motor support unit 10. Preferably, at least one first fastening receptacle 67 is also arranged on the second longitudinal section 12 of the motor support unit 10.The first longitudinal section 11 of the motor support unit 10, however, is free of first fastening units 65, in particular of first fastening receptacles 67.

[0035] As in the Fig. 5 and Fig. As shown in Figure 6, the drive motor 3 is attached in the second longitudinal section 12 of the motor support unit 10. The drive motor 3 is essentially located on the second outer surface 18 of the motor support unit 10. The motor mount 14 is also formed on the second outer surface 18 of the motor support unit 10.

[0036] As particularly in Fig. As shown in Figure 8, the motor support unit 10 includes a mounting section 19. The mounting section 19 serves to attach a component to the motor support unit 10, with the tool 5 being held on the component. In the present embodiment of the work device 1, the mounting section is provided for attaching the boom 30 to the motor support unit 10. If the work device 1 is designed as a chainsaw, the mounting section 19 is preferably provided for attaching a guide rail to it. The saw chain would then be guided on the guide rail as the tool. The mounting section 19 is formed on the first outer surface 17 of the boom 10. In the present embodiment, the mounting section 19 extends from the central section 13 across the second longitudinal section 12 to the front end 28 of the motor support unit 10.In the area of ​​the fastening section 19, several, in this case three, stud bolts 37 are arranged on the motor support unit 10, in particular screwed into the motor support unit 10. The boom 10 lies, as in the . Fig. 3 and Fig. As shown in Figure 4, the arm 30 is attached to the mounting section 19 of the motor support unit 10 and is fastened to the motor support unit 10 via the studs 37 and the associated nuts 38. When the nuts 38 are loosened, the arm 30 can be moved in its longitudinal direction 34. This allows the tension of the belt 56 to be adjusted. The studs 38, which are fastened in the motor support unit 10, extend through openings in the arm 30, which are designed as elongated holes to allow the arm 30 to be moved relative to the motor support unit 10.

[0037] Furthermore, a central opening 71 is provided on the motor support unit 10 ( Fig. 8 and Fig. 9) provided, which is part of the motor mount 14, in particular part of the hollow shaft. The drive shaft 4 of the drive motor 3 projects through the central opening 71. The drive shaft 4 projects from the second outer surface 18 of the motor support unit 10 through the central opening 71 to the first outer surface 17 of the motor support unit 10. Furthermore, the drive shaft 4 also projects through an opening in the boom 10. At the end of the drive shaft 4 that is located on the first outer surface 17 of the motor support unit 10, the pulley 55 is arranged, which drives the belt 56. The boom 30 is covered by a cover 73. In addition, the cover 73 also covers the pulley 55 and the belt 56.

[0038] As in Fig. As shown in Figure 6, the housing 2 is attached to the rear end 27 of the motor support unit 10 by means of the fastening units 65. In this area, the housing 2 is formed from a handle housing 76. The handle housing 76 is attached to the rear end 27 of the motor support unit 10 via the fastening units 65. The rear handle 53 is formed on the handle housing 76. The actuating element 6 and the locking element 9 are arranged on the rear handle 53.

[0039] Second fastening units 68, in particular second fastening receptacles 70, are provided on the motor support unit 10 for attaching the front handle 54 to the motor support unit 10. As shown in particular in the Fig. 8 and Fig. As shown in Figure 11, the second fastening units 68 are formed at the front end 28 of the engine support unit 10. A different positioning of the fastening units 68, at least partially, for example in the second longitudinal section 12 of the engine support unit 10, may also be advantageous.

[0040] A first, upper handle receptacle 74 is arranged, and in particular designed, on the motor support unit 10. The upper handle receptacle 74 is preferably an integral part of the motor support unit 10. The first, upper handle receptacle 74 serves to support and secure the front handle 54. The first, upper handle receptacle 74 of the motor support unit 10 is located in the area of ​​the upper surface 44 of the implement 1 and in the area of ​​the first longitudinal outer surface 46 of the implement 1. The first, upper handle receptacle 74 has an approximately semi-cylindrical contour 77 in which the front handle 54 rests. The front handle 54 is designed as a handle tube. Naturally, the geometry of the handle tube and the contour 77 of the upper handle receptacle 74 are coordinated. In the present embodiment, the handle tube is cylindrical, and therefore the contour 77 is also semi-cylindrical.Other geometries of the handle tube and the contour 77 of the first, upper handle mounting 74 may also be suitable, provided that they are coordinated with each other.

[0041] The first, upper handle receptacle 74 has at least one, preferably two, second mounting receptacles 70. The second mounting receptacles 70 are preferably designed as openings, each with an internal thread, so that the front handle 54 can be screwed to the first, upper handle receptacle 74 using screws as fasteners 69. As shown in Fig. As shown in Figure 7, the handle 54 extends from one end 79 to another end 80. Preferably, one end 79 of the front handle 54 is attached to the first, upper handle receptacle 74 of the motor support unit 10.

[0042] A second, lower handle receptacle 75 is arranged on the motor support unit 10, in particular designed ( Fig. 11) The second, lower handle receptacle 75 is preferably an integral part of the motor support unit 10. The second, lower handle receptacle 75 serves to support and secure the front handle 54. The second, lower handle receptacle 75 of the motor support unit 10 is located in the area of ​​the underside 45 of the working device 1. Analogous to the first, upper handle receptacle 74, the second, lower handle receptacle 75 has an approximately semi-cylindrical contour 78 in which the front handle 54 rests. At least one, preferably two, second mounting receptacles 70 are formed in the second, lower handle receptacle 75. The front handle 54 can be screwed to the second, lower handle receptacle 75 using screws as fastening means 69. Preferably, the other end 80 of the front handle 54 is attached to the second, lower handle receptacle 75 of the motor support unit 10.

[0043] As in Fig. As shown in Figure 7, the front handle 54, in particular the handle tube, extends from the first, upper handle receptacle 74 across the top surface 44 to the second longitudinal outer surface 47 of the working device 1. From there, the front handle 54, in particular the handle tube, extends along the second longitudinal outer surface 47 to the underside 45 of the working device 1 and terminates in the second, lower handle receptacle 75 on the underside 45 of the working device 1. The front handle 54 is attached to the motor support unit 10 only at its two ends 79, 80. In the area between its two ends 79, 80, the front handle 54 is spaced apart from the housing 2 of the working device 1, so that the operator can grip the front handle 54.

[0044] In an alternative embodiment of the work device 1, the first, upper handle receptacle 74 can also be arranged in a different location. For example, the first, upper handle receptacle 74 can alternatively be integrated into the mounting section 19 of the motor support unit 10. In such an embodiment, the first, upper handle receptacle 74 would be located essentially on the first longitudinal outer surface 46. Other positions are also conceivable. However, it is particularly advantageous that both the first, upper handle receptacle 74 and the second, lower handle receptacle 75 are formed directly on the motor support unit 10. Thus, the front handle 54 is attached directly to the motor support unit 10. The rear handle 53, in particular the handle housing 76, is also attached directly to the motor support unit 10. It is particularly preferred that no separately formed anti-vibration element is provided between the front handle 54 and the motor support unit 10.Preferably, no separately designed anti-vibration element is provided between the rear handle 53 and the motor support unit 10. Since the drive motor 3 is designed as an electric motor in the present embodiment, vibration decoupling between the drive motor 3 and the front handle 54 as well as the rear handle 53 is not required.

[0045] As in the Fig. 5, Fig. 6 to Fig. As shown in Figure 7, the receiving housing 20, in which the at least one battery pack 7 and / or the further battery pack 7' are arranged, is located in the longitudinal section 11 of the motor support unit 10. The receiving housing 20 is thus situated, with respect to the longitudinal direction 26 of the motor support unit 10, between the rear end 27 of the motor support unit 10 and the central section 13 of the motor support unit 10. The first receptacle 21 of the receiving housing 20 and the second receptacle 22 of the receiving housing 20 are separated from each other by the longitudinal section 11 of the motor support unit 10. In other words, the receptacle 21 and the receptacle 22 are arranged opposite each other with respect to the first longitudinal section 11 of the motor support unit 10. The first receptacle 21 of the receiving housing 20 faces the first outer surface 17 of the motor support unit 10, in particular in the first longitudinal section 11 of the motor support unit 10.The second receptacle 22 of the mounting housing 20 is arranged facing the second outer surface 18 of the motor support unit 10. Thus, the motor support unit 10 runs between the two receptacles 21, 22 of the mounting housing 20, in particular between the two battery packs 7, 7'.

[0046] The receiving housing 20, comprising the first receptacle 21 and the second receptacle 22, is preferably formed in one piece. The receiving housing 20 has an opening 23 that extends in the direction of the longitudinal center axis 26 of the motor support unit 10. Thus, the motor support unit 10 can be arranged in the opening 23 of the receiving housing 20. The opening 23 is open downwards, i.e., towards the underside 45 of the working device 1. The first receptacle 21 and the second receptacle 22 of the receiving housing 20 are separated from each other by the opening 23. By means of this arrangement of the motor support unit 10 and the receiving housing 20, the motor support unit 10 is at least partially centrally located in the housing 2 of the working device 1, thereby uniformly supporting and stiffening the housing 2 via the first fastening elements 65.By arranging the two battery packs 7, 7' or the two mounts 21, 22 of the mounting housing 20 on each outer side 17, 18 of the motor support unit 10, a compact design of the working device 1 can be ensured.

[0047] As in the Fig. 5, Fig. 6 to Fig. As shown in Figure 7, the receiving housing 20 is only attached to the housing 2. There is no direct connection between the receiving housing 20 and the motor support unit 10. The housing 2 has a certain degree of flexibility, which allows relative movement of the receiving housing 20 with respect to the motor support unit 10. Furthermore, the receiving housing 20 and the motor support unit 10 are spaced apart from each other. This ensures that mutual jamming of the components is avoided when relative movement between the receiving housing 20 and the motor support unit 10 is desired. Preferably, the motor support unit 10 is free of contact with the receiving housing 20 along its entire first longitudinal section 11. Third fastening units 82 are provided for attaching the receiving housing 20 to the housing 2. The fastening units 82 are preferably designed as screw connections.

[0048] The motor support unit 10 is preferably a cast part. The motor support unit 10 is preferably made of a material with a higher modulus of elasticity than the material of the housing 2. The motor support unit 10 is preferably made of a metal alloy, particularly a magnesium alloy. The housing 2 is preferably made of a plastic. The housing 2 is designed to have sufficient strength to protect the components arranged within it. At the same time, the housing 2 has an elasticity that dampens the corresponding inertial forces of the battery packs 7, 7' in the event of a sudden impact of the work tool 1 on the ground or against other objects, so that the forces transmitted from the receiving housing 20 via the housing 2 to the motor support unit 20 are dampened accordingly.

[0049] The mounting housing 20, the motor support unit 10, and the housing 2 are arranged and designed relative to each other such that, in the event of an impact of the working device 1 on an object or similar, a force flow generated by the moment of inertia of the battery packs 7, 7' arranged in the mounting housing 20 is not possible from the mounting housing 20 directly to the motor support unit 10. The force flow originates from the battery packs 7, 7', passes through the mounting housing 20 into the housing 2, and from the housing 2 into the motor support unit 10. Through elastic and / or plastic deformation of the housing 2, the energy is converted into energy within the housing 2 by deformation. The resulting impact load acting on the motor support unit 10 is thus significantly reduced, thereby preventing damage to the motor support unit 10.

[0050] As in Fig. As shown in Figure 10, the motor support unit 10 comprises a base body 90 that extends from the first longitudinal section 11 through the central section 13 to and including the second longitudinal section 12. This base body 90 is simply curved according to the Z-shaped contour of the central section 13. The motor mount 14 is arranged on the base body 90 of the motor support unit 10. The first longitudinal section 11 of the motor support unit 10 is located centrally in the interior of the housing ( Fig. 5, Fig. 6 to Fig. 7) The rear handle 6 has a longitudinal center axis 96, wherein, in a top view of the implement, i.e., in the direction of view of the transverse plane 62, the longitudinal center axis 96 of the rear handle 6 lies in the first longitudinal section 11 of the motor support unit 10. Thus, the first longitudinal section 11 of the motor support unit 10 divides the interior of the housing in the area of ​​the longitudinal section 11 into two equally sized smaller installation spaces, in each of which a receptacle 21, 22 of the receptacle housing 20 is arranged. The second longitudinal section 12 of the motor support unit 10 lies outside the longitudinal center axis 96 of the rear handle 6. The distance of the second longitudinal section 12 of the motor support unit 10 to the first longitudinal outer surface 46 of the implement 1 is less than the distance of the first longitudinal section 11 of the motor support unit 10 to the first longitudinal outer surface 46 of the implement 1.As a result, the installation space in the area of ​​the second longitudinal section 12 of the motor support unit 10 towards the second longitudinal outer side 47 is significantly larger than the two smaller installation spaces in the area of ​​the first longitudinal section 11 of the motor support unit 10.

[0051] As in the Fig. 8 and Fig. As shown in Figure 9, the engine support unit 10 comprises at least one stiffening rib 95, and in this case, several stiffening ribs 95. The stiffening ribs 95 extend substantially in the direction of the longitudinal center axis 26 of the engine support unit 10. The stiffening ribs 95 are formed on both the first outer surface 17 and the second outer surface 18. The stiffening ribs 95 extend at least from the first longitudinal section 11 to the central section 13. In this case, the stiffening ribs 95 extend on the first outer surface 17 of the engine support unit 10 from the rear end 27 of the engine support unit 10, across the first longitudinal section 1 of the engine support unit 10, to the central section 13 of the engine support unit 10.On the second outer surface 18 of the motor support unit 10, the stiffening ribs 95 extend from the rear end 27 of the motor support unit 10 over the first longitudinal section 11 of the motor support unit 10, over the central section 13 of the motor support unit 10 to the second longitudinal section 12 of the motor support unit 10. The stiffening ribs 95 are preferably continuous in the direction of the longitudinal center axis 26 of the motor support unit 10.

[0052] As in the Fig. 12 and Fig. As shown in Figure 13, the working device 1 includes a stop 110. The stop 110 is arranged on the protective hood 51 of the working device 1. Furthermore, the working device 1 includes a counter-stop 120. The counter-stop 120 is formed on the motor support unit 10. The stop 110 and the counter-stop 120 are designed for mechanical interaction in order to limit a pivoting movement of the protective hood 51 into an end position 131. The tool 5 is rotatably mounted about a pivot axis 8. The protective hood 51 is pivotably mounted about a pivot axis. The pivot axis of the protective hood 51 corresponds to the pivot axis 8 of the tool 5. The protective hood 51 has an open position 132, as shown in Figure 13. Fig. As shown in 12, it can be swivelled into the final position 131. Fig. Figure 13 shows the protective hood 51 of the working device 1 in its end position 131. In this end position 131, the stop 110 of the protective hood 51 and the counter-stop 120 of the motor support unit 10 contact each other.

[0053] As in Fig. As shown in Figure 14, the protective hood 51 is pivotable through a maximum swivel angle α. This maximum swivel angle α extends, relative to the axis of rotation 8, from the open position 132 to the end position 131. Pivoting the protective hood 51 in the direction of rotation 52 of the tool 5 beyond the end position 131 is not possible. Pivoting the protective hood 51 against the direction of rotation 52 of the tool 5 beyond the open position 132 is also not possible. The maximum swivel angle α is preferably less than or equal to 90°, and particularly less than 60°. The maximum swivel angle α of the protective hood 51 from the open position 132 to the end position 131 or from the end position 131 to the open position 132 is preferably at least 30°.

[0054] As in Fig. As shown in Figure 12, the protective cover 51 extends from a first end 112 around the axis of rotation 8 to a second end 113. The second end 113 is the end of the protective cover 51 that is located closer to the housing 2, preferably closer to the motor support unit 10, in both the end position 131 and the open position 132 of the protective cover 51. Furthermore, the second end 113 lies below the first end 112 of the protective cover 51. The stop 110 is preferably located adjacent to the end 113 of the protective cover 51. The protective cover 51 has a first longitudinal side 115, a second longitudinal side 116, and a circumferential side 114. The first longitudinal side 115 and the second longitudinal side 116 are connected to each other via the circumferential side 114. The main extension direction of the first longitudinal side 115 and the second longitudinal side 116 of the protective hood 51 runs approximately parallel to the tool plane 50. The stop 110 is arranged on the circumferential side 114 of the protective hood 51.

[0055] The stop 110 is preferably integrally formed with the protective hood 51. The protective hood 51 is preferably a cast component. The protective hood 51 and the stop 110 are preferably formed from a single cast component. The protective hood 51 and the stop 110 are particularly made of a metal alloy.

[0056] Thus, the protective hood 51, together with the stop 110, exhibits high component strength. In an alternative design, the protective hood 51 can also be welded from sheet metal elements.

[0057] As especially in the Fig. 9, Fig. 10 to Fig. As shown in Figure 11, the counter-stop 120 is arranged at the front end 28 of the motor support unit 10. Preferably, the counter-stop 120 is formed integrally with the motor support unit 10. As already described above, the motor support unit 10 is, in the preferred embodiment, formed as a cast component. Accordingly, the motor support unit 10 and the counter-stop 120 form a single cast component. The motor support unit 10 and the counter-stop 120 are preferably made of a metal alloy, in particular a magnesium alloy.

[0058] As in the Fig. 12, Fig. 13, Fig. 14, Fig. 15 to Fig. As shown in Figure 16, the working device 1 comprises a first stop surface 111 and a second stop surface 122. The first stop surface 111 is formed on the stop 110 of the protective hood 51. The second stop surface 122 is formed on the counter-stop 120 of the motor support unit 10. In the end position 131 of the protective hood 51, the stop 110 rests with the first stop surface 111 against the second stop surface 122 of the counter-stop 122. In the end position 131 of the protective hood 51, the first stop surface 111 and the second stop surface 122 contact each other in a contact area 130. The first stop surface 111 and the second stop surface 122 are therefore designed such that they make contact over their entire surface in the end position 131 of the protective hood 51.

[0059] In Fig. Figure 16 shows the stop 110 and the counter-stop 120 enlarged in mutual contact. The contact surface 130 spans a contact plane 140. The tool 5 is in Fig. The tool 5 is shown with a dashed line and has a tool circumference 141. The fact that such a tool 5, for example designed as a cutting disc, does not have a perfectly circular tool circumference is to be understood as the outermost radial contour of a body of rotation defined by the tool 5, relative to the axis of rotation 8 of the tool 5. The contact plane 140 intersects the tool 5 at the tool circumference 141 of the tool 5 in a contact line not shown in detail. The tool 5 has a tangent plane 142 at this contact line. In other words, the tool 5 has a tangent plane 142 that is tangent to the tool 5 at the tool circumference 141 in the aforementioned contact line. The contact plane 140 and the tangent plane 142 intersect in the contact line and enclose an angle β. The angle β is open in the direction of rotation 52 of the tool 5 with respect to the contact line.The angle β is preferably less than 90°, particularly less than 80°. The angle β is particularly greater than 60°, particularly greater than 70°. The angle β is selected such that the stop and the counter-stop interlock. The protective cover 51 is drawn towards the motor support unit 10 by the angular alignment of the contact zone described above when the stop 110 and the end stop 120 are in contact. Nevertheless, the angle β is not so acute that the tightening forces of the stop 110 and the counter-stop 120 are so high that the stop 110 breaks out of the protective cover 51 or the counter-stop 120 breaks out of the motor support unit 10.

[0060] As particularly in Fig. As shown in Figure 9, the counter-stop 120 has a load-bearing structure 121. The load-bearing structure 121 extends from the second stop surface 122 tangentially to the direction of rotation 52 of the tool into the base body 90 of the motor support unit ( Fig. 14) The counterstop 120 has several ribs 123, which are part of the load-bearing structure 121. In the preferred embodiment of the working device 1, the counterstop 120 comprises two outer ribs 123 that limit the counterstop 120 in the direction of the axis of rotation 8 of the tool 5, i.e., in the width of the counterstop. At least one further rib, preferably two or more ribs, is arranged between the two outer ribs 123. This provides, firstly, sufficient support structure to enable a high force transmission from the stop 110 of the protective hood 51 via the counterstop 120 to the base body 90 of the motor support unit 10. Secondly, the rib-shaped load-bearing structure facilitates the manufacturability of the counterstop 120 as a cast component.

[0061] As in Fig. As shown in Figure 16, the first stop surface 111 on the stop 110 of the protective hood 51 is aligned in the direction of rotation 52 of the tool 5. The second stop surface 122 on the counter stop 120 of the motor support unit 10 is aligned opposite to the direction of rotation 52 of the tool 5.

[0062] As in Fig. As shown in Figure 15, the first stop surface 111 of the stop 110 has a width d measured in the direction of the axis of rotation 8 of the tool 5. The second stop surface 122 of the counter stop 120 has a width e measured in the direction of the axis of rotation 8 of the tool 5. The width e of the second stop surface 122 of the counter-stop 120 is greater than the width d of the first stop surface 111 of the stop 110. The width e of the second stop surface 122 of the counter-stop 120 corresponds to at least 1.2 times, preferably at least 1.3 times, and in particular at least 1.4 times, the width d of the first stop surface 111 of the stop 110 of the protective hood 51. Particularly preferably, the width e of the second stop surface 122 of the counter-stop 120 corresponds to approximately 1.5 times the width d of the first stop surface 111 of the stop 110 of the protective hood 51.The width d of the first stop surface 111 of the stop 110 is less than the width of the base body of the protective hood 51, which is determined by the distance measured in the direction of the axis of rotation 8 of the tool 5 between the first longitudinal side 115 and the second longitudinal side 116 of the protective hood 51.

[0063] As in Fig.As shown in Figure 15, the first stop surface 111 of the stop 110 and the second stop surface 122 of the counter-stop 120 are arranged relative to each other such that their ends facing the boom 30 are positioned approximately in the same direction with respect to one direction of the axis of rotation 8 of the tool 5. Since the second stop surface 122 is wider than the first stop surface 111, the end of the second stop surface facing away from the boom 30 is significantly further away from the boom than the end of the first stop surface facing away from the boom 30. This ensures that even if the protective hood is deformed, for example by vibrations of the protective hood, the entire first stop surface 111 of the stop 110 rests on the second stop surface 122 of the counter-stop 120. If the protective hood 51 deforms, it usually deforms away from the boom 30, as this forms a one-sided stop for the protective hood 51.

[0064] In a further, alternative embodiment of the working device 1, it is planned to also provide stops and counter bodies analogous to the embodiment shown, which enable the working device 1 to be operated with two directions of rotation of the tool 5.

Claims

[1] Hand-held work equipment comprising, a housing (2), a motor support unit (10) formed separately from the housing (2), which is connected to the housing (2), a drive motor (3) arranged in the housing (2) for driving a tool (5) rotating about a rotary axis (8), wherein the drive motor (3) is attached to the motor support unit (10), a protective hood (51), wherein the protective hood (51) at least partially covers the tool (5), wherein a stop (110) is provided on the protective hood (51), wherein the working device (1) comprises a counter stop (120) which is provided for operative connection with the stop (110) of the protective hood (51) in order to limit the pivoting movement of the protective hood (51) to an end position (131), characterized by, that the counter-stop (120) is formed, in particular directly, on the motor support unit (10) and that the motor support unit (10) is a component of particularly high strength and stiffness. [2] Working tool according to claim 1, characterized by , that the protective hood (51) is pivotably mounted about the axis of rotation (8) of the tool (5), and that the maximum pivot angle (α) of the protective hood (51) from the end position (131) to an open position (132) of the protective hood (6) is less than or equal to 90°, in particular less than 60°. [3] Working equipment according to claim 1 or 2, characterized by , that the protective hood (51) is pivotably mounted about the axis of rotation (8) of the tool (5), and that the maximum swivel angle (α) of the protective hood (51) from the end position (131) to the open position (132) of the protective hood (51) is at least 30°. [4] Working equipment according to one of claims 1 to 3, characterized by, that the counter-stop (120) is integrally formed with the motor support unit (10). [5] Working device according to any one of claims 1 to 4, characterized by , that the motor support unit (10) is designed as a cast component, wherein the motor support unit (10) preferably consists of a metal alloy, in particular a magnesium alloy. [6] Working device according to any one of claims 1 to 5, characterized by , that the counter stop (120) has a load-bearing structure (121), wherein the load-bearing structure (121) extends from a stop surface (122) tangentially to the direction of rotation (52) of the tool (5) into a base body (90) of the motor support unit (10). [7] Working device according to any one of claims 1 to 6, characterized by , that the protective hood (51) is made of a metal alloy, wherein the stop (110) is cast onto the protective hood (51). [8] Working device according to any one of claims 1 to 7, characterized by, that the working device (1) has a first stop surface (111) formed on the stop (110) of the protective hood (51) and a stop surface (111) on the counter-stop (120) is a second stop surface (122) of the working device (1), wherein when the stop (110) and counter-stop (120) are in contact, the first stop surface (111) and the second stop surface (122) touch in a common contact surface (130). [9] Working tool according to claim 8, characterized by, that the contact surface (130) spans a contact plane (140), and that the contact plane (140) intersects the tool (5) at a tool circumference (141) of the tool (5) in a contact line and forms an angle (β) with a tangent plane (142) of the tool (5) which touches the tool (5) at the contact line, wherein the angle (β) is open in the direction of rotation (52) of the tool (5), wherein the angle (β) is less than or equal to 90°, in particular less than 80°, and wherein the angle (β) is in particular greater than 55°, in particular greater than 65°, in particular greater than 70°. [10] Working tool according to claim 8 or 9, characterized by , that the counter stop (120) is wider than the stop (110) in the direction of the axis of rotation (8) of the tool (5).

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