Damping device for rechargeable battery

Abstract

The invention relates to a machining tool (1), in particular a chiseling hammer, the machining tool has a housing (3), a working axis (9) extending in a longitudinal direction, at least one rechargeable battery interface device (19, 21) for detachably connecting at least one rechargeable battery (15, 17) to the machining tool (1), and a first side handle (5) having a first main direction of extension (33) and a second side handle (7) having a second main direction of extension (35). The side handles (5, 7) are arranged substantially symmetrically with respect to the working axis (9). At least one decoupling device (39, 41) is provided for producing a damping connection of the side handle (5, 7) to the housing (3). A protection device (75) is provided for protecting the rechargeable battery (15, 17) coupled to the battery interface device (19, 21). The protection device (75) has an interior space (93) for at least partially accommodating the at least one rechargeable battery (15, 17). The protective device (75) encloses the circumference of the housing (3) with respect to the longitudinal direction (9) and is connected to the at least one side handle (5, 7) via at least one connecting device (78).

Description

Technical Field

[0001] The invention relates to a machining tool, in particular to a chiseling hammer of the type described in more detail in the preamble to claim 1. Background Art

[0002] EP 3 943 251 A1 discloses a chiseling hammer with a housing, wherein the drive of the chiseling hammer can be supplied with energy by means of a rechargeable battery. Two laterally arranged handles are provided, wherein a decoupling device is provided for reducing vibrations acting on the handles during operation. The chiseling hammer has a configuration for arranging two rechargeable batteries, which can be arranged on the side of the housing facing away from the tool holder and thus above the housing by means of a battery connection device on the housing. A protective device is provided for protecting the rechargeable batteries.

[0003] Disadvantageously, such chiseling hammers have a large construction height in the longitudinal direction of the chiseling hammer. In the event that the chiseling hammer tips over or falls, a potential long fall could exert large forces on the rechargeable battery, so that the protective device must be particularly stable and sturdy for this purpose.

[0004] Furthermore, DE 10 2018 210 189 A1 discloses an impact hammer having a housing, wherein the center of gravity of the machining tool is arranged substantially on the working axis. The machining tool has a battery interface via which a rechargeable battery pack can be detachably connected to the machining tool. The handles are connected to the housing via a damping unit. A battery pack is also disclosed which is arranged below the handle and is protected by a protective element connected to the handle.

[0005] Disadvantageously, protection of the battery pack may be inadequate or undesirably minimal with such designs, particularly in the event that the machining tool is dropped or otherwise impacted. Summary of the invention

[0006] An object of the present invention is to provide a machining tool, particularly a chipping hammer, in which the construction height of the machining tool is reduced and in which a rechargeable battery connected to the machining tool can be reliably protected with a simple structure.

[0007] This object is achieved by the subject matter of independent claim 1. Further advantageous embodiments of the invention can be found in the corresponding dependent claims.

[0008] A machining tool, specifically a chiseling hammer, is provided with a housing, a working axis extending in a longitudinal direction, at least one battery interface device for detachably connecting at least one rechargeable battery to the machining tool, and a first side handle having a first main extension direction and a second side handle having a second main extension direction, wherein the side handles are arranged substantially symmetrically with respect to the longitudinal direction, wherein at least one decoupling device is provided for producing a vibration-damping connection of the side handle to the housing, wherein a protective device is provided for protecting a rechargeable battery coupled to the battery interface device, and wherein the protective device has an internal volume for at least partially accommodating at least one rechargeable battery.

[0009] According to the invention, it is proposed that the protection device encloses the circumference of the housing with respect to the longitudinal direction and is connected to at least one side handle via at least one connecting device.

[0010] The machining tool designed according to the invention has the following advantages: the rechargeable battery connected to the at least one rechargeable battery interface device can be protected from damage in a simple manner, in particular in all operating states of the machining tool. This is achieved by the design of the protection device comprising a housing, whereby the support of the protection device on the housing is achieved in a simple manner. Furthermore, the rechargeable battery connected to the battery interface device is protected from vibrations by the fact that the battery interface device is coupled to a side handle, which is decoupled from the housing during operation by means of a decoupling device.

[0011] Furthermore, the machining tool designed according to the invention has an advantageously smaller construction height in the longitudinal direction of the machining tool. This is achieved in that the protective device comprises a housing and is therefore not arranged on the side of the housing facing away from the tool holder. Furthermore, due to the arrangement of the battery interface device in the end region of the machining tool facing away from the tool holder, the center of gravity of the proposed machining tool is advantageously arranged close to the working surface. Thus, due to the arrangement of the rechargeable battery in the end region of the machining tool facing away from the tool holder, the maximum drop height of the rechargeable battery connected to the battery interface device during operation of the machining tool is also reduced, so that the risk of damage to the rechargeable battery connected to the battery interface device is reduced.

[0012] The first side handle and the second side handle in each case define a first main extension direction or a second main extension direction, wherein the main extension direction in the unloaded state of the side handle is in particular arranged substantially perpendicular to the longitudinal direction and extends substantially in the transverse direction. The center of gravity of the machining tool in the upright position is preferably located substantially on the working axis of the machining tool defined by the tool holder.

[0013] Due to the decoupling device, mechanical influences acting during operation of the machining tool, such as for example shocks, vibrations, etc., are reduced for a user holding the machining tool by the side handle. Furthermore, the rechargeable battery connected to the battery interface device is also protected from mechanical influences by the decoupling device, and / or their influence on the rechargeable battery connected to the battery interface device is greatly reduced.

[0014] In an advantageous embodiment of the machining tool according to the invention, the connecting device enables the protective device to be moved substantially in the longitudinal direction relative to the housing. Thus, a decoupling of the protective device and thus the battery interface device from the housing is achieved in a simple manner. Furthermore, the housing can serve as a guide for the protective device and contribute to its stability.

[0015] In a structurally simple embodiment of the invention, the connecting device has at least two levers, wherein the protection device is connected to the first side handle by means of a first lever and to the second side handle by means of a second lever. The protection device is coupled to the side handle by means of the levers and is protected by the decoupling device in a manner corresponding to the side handle from vibrations acting on the housing during operation of the machining tool.

[0016] A particularly good protection of the rechargeable battery connected to the battery interface device can be achieved if the connection device has at least two flexible elements, wherein the protection device is connected to the first side handle by means of a first flexible element and to the second side handle by means of a second flexible element. Due to the flexible elements, vibrations acting on the protection device and therefore also on the rechargeable battery during operation of the machining tool can be further damped. Furthermore, additional protection is ensured in the event that the machining tool is dropped or falls.

[0017] In a preferred embodiment of the machining tool according to the invention, the flexible element is designed with an elastomeric material. However, in principle, any material having elastic or damping properties can be used.

[0018] In order to limit the freedom of movement of the protective device in the longitudinal direction relative to the shell and thereby achieve good fall protection, the protective device may have a first stop area and the shell may have a second stop area, wherein when the protective device is displaced by a defined threshold value in the longitudinal direction relative to the shell starting from a static position, the protective device and the shell contact each other via the stop area.

[0019] Alternatively or in addition, provision can be made for the protective device to have a third stop region and for the housing to have a fourth stop region, which extend substantially in the longitudinal direction. On the one hand, during vibration damping, guidance of the protective device relative to the housing is provided by the interaction of the third stop region with the fourth stop region, which are preferably circumferential in design. On the other hand, this interaction enables support of the protective device on the housing, for example in the event of a fall or drop of the machining tool. In the idle state of the machining tool, there is a distance between the third stop region and the fourth stop region, in particular on the circumference, which is selected such that jamming of the protective device relative to the housing during operation of the machining tool is reliably prevented.

[0020] If the protective device and therefore also the rechargeable battery interface device and optionally the rechargeable battery connected to the battery interface device are arranged on the side of each side handle facing the tool holder with respect to the longitudinal direction and in particular below the side handle in the longitudinal direction, an embodiment of the invention is achieved which is improved with respect to the center of gravity, the user's view in the direction of the working area and the construction length of the machining tool.

[0021] In an advantageous embodiment of the machining tool according to the invention, the protective device has at least two rechargeable battery interface devices, wherein the rechargeable battery interface devices are in particular arranged substantially symmetrically with respect to the longitudinal axis. It can also be provided that the protective device has three, four or more battery interface devices. At least one rechargeable battery can be connected to the battery interface device. It can also be provided that two, three or more rechargeable batteries can be operably connected to the battery interface device.

[0022] In order to enable the arrangement of the rechargeable battery on the corresponding battery interface device in the insertion direction in a simple manner, at least one protective device can have a recess, which is substantially perpendicular to the longitudinal direction and perpendicular to the transverse direction, for operatively connecting the rechargeable battery to the battery interface device. In principle, provision can also be made for the protective device to be designed such that the arrangement of the rechargeable battery on a given battery interface device can be oriented as desired in the insertion direction.

[0023] In an advantageous embodiment of the machining tool according to the invention, the at least one protective device is configured such that, in the case of a rechargeable battery being connected to the battery interface device and in the case of the machining tool falling in any direction, the at least one protective device comes into contact with a flat ground surface before the rechargeable battery connected to the battery interface device. In this way, particularly good protection of the rechargeable battery connected to the battery interface device can be ensured in any operating situation.

[0024] In an advantageous embodiment of the invention, for decoupling the side handle from the housing, a first decoupling device is provided, the first decoupling device having a first spring device and a first lever device, by means of which the first side handle can be rotatably articulated at a first pivot point fixed to the housing, and a second decoupling device having a second spring device and a second lever device, by means of which the second side handle can be rotatably articulated at a second pivot point fixed to the housing, wherein the first spring device is fixed to the housing on one side and connected to the first lever device on the other side, and the second spring device is fixed to the housing on one side and connected to the second lever device on the other side. The spring device is specifically designed as a tension spring and reduces vibrations acting on the side handle during operation of the machining tool.

[0025] Other advantages can be seen in the following description of the drawings. Different exemplary embodiments of the present invention are shown in the drawings. The drawings, the description and the claims contain many combined features. It will also be convenient for those skilled in the art to consider these features individually and to combine these features to form meaningful additional combinations. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In the attached picture: Figure 1 shows a side view of a machining tool designed as a chipping hammer, wherein a chisel is arranged in a tool holder; the machining tool is shown in an unloaded, resting state; Figure 2 Shown according to Figure 1 3D view of the chiseling hammer; Figure 3 Shown according to Figure 1 and Figure 2 The chiseling hammer corresponds to Figure 1 A side view of a chiseling hammer shown without a housing portion; Figure 4 Shown according to Figures 1 to 3 Chiseling hammer and Figure 1 is a side view rotated 90° compared to the illustration in FIG. ; and Figure 5 Shown according to Figures 1 to 4 Side view of a chiseling hammer arranged on a flat ground surface, wherein the protective device can be seen in the cross-section.

[0027] Exemplary embodiments Figures 1 to 5 A machining tool 1 designed as a chiseling hammer is respectively shown. However, the machining tool 1 can also be designed in the form of a screwdriver, a drill, a hammer drill or the like.

[0028] The machining tool 1 designed as a chiseling hammer is shown in the figures in a rest position, i.e. in an unactivated state, and has a housing 3 which can be designed in one piece or in multiple pieces. Furthermore, the machining tool 1 has a first side handle 5 and a second side handle 7 which are substantially symmetrical about a working axis 9 which defines the longitudinal axis or longitudinal direction of the machining tool 1. In the present case, the tool holder 11 engages with a tool 13 designed as a chisel which is located in the working axis 9.

[0029] The motor and the impact device are accommodated inside the housing 3. The impact device can also be called an impact mechanism or an impact device. The motor and the impact device are connected to each other so that a pulse-shaped impact is generated and transmitted to the tool holder 11. Neither the motor nor the impact device is shown in the figure.

[0030] In order to supply electrical energy to the machining tool 1 and in particular to the electric motor, in the present case a first rechargeable battery 15 and a second rechargeable battery 17 are provided, wherein the first rechargeable battery 15 is operatively connected to a first rechargeable battery interface device 19 and the second rechargeable battery 17 is operatively connected to a second rechargeable battery interface device 21. The battery interface devices 19, 21 are arranged on the protective device 75, which will be discussed in more detail below.

[0031] According to alternative embodiments, it is also possible to use only one rechargeable battery or more than two rechargeable batteries.

[0032] The housing 3 has a lower end 23 in the longitudinal direction 9 and an opposite upper end 25, in the region of which the tool holder 11 is arranged. Furthermore, the housing 3 has a first lateral region 27 and a second lateral region 29. The lateral regions 27, 29 form opposite boundaries of the housing 3 in a transverse direction 31. The transverse direction 31 is perpendicular to the working axis 9 and, in the present case, is substantially identical to the main extension directions 33, 35 of the side handles 5, 7 in the stationary state of the machining tool 1.

[0033] The first side handle 5 is arranged in a first lateral region 27 and the second side handle 7 is arranged in a second lateral region 29 of the housing 3 which is opposite to the first lateral region 27 in the transverse direction 31 .

[0034] Set the available Figure 3 3 and 4. A decoupling device 37 is shown in more detail in the drawing, by means of which the side handles 5 and 7 are decoupled from the housing 3 to a certain extent and thereby from shocks, vibrations etc. which are transmitted to the housing 3 via the chisel 13 during operation of the machining tool 1.

[0035] In the present case, the decoupling device 37 has a first decoupling device 39 assigned to the first side handle 5 and a second decoupling device 41 assigned to the second side handle 7. The first decoupling device 39 has a first spring device designed as a tension spring 43 and a first lever device 45. The first lever device 45 is hingedly fixed to the housing on a first pivot point 47 on one side and is connected to the first side handle 5 on the other side. The first tension spring 43 is fixed to the housing on one side and is linked to a first hinge point 49 on the other side, which is located between the first pivot point 47 fixed to the housing and the first side handle 5. Thus, the first side handle 5 can be displaced in a circular arc relative to the housing 3 about the first pivot point 47 fixed to the housing, so that the first main extension direction 33 can be rotated through a certain angle range relative to the transverse direction 31.

[0036] Similarly, the second decoupling device 41 has a second spring device designed as a tension spring 51 and a second lever device 53. The second lever device 53 is hingedly fixed to the housing at a second pivot point 55 on one side and is connected to the second side handle 7 on the other side. The second tension spring 51 is fixed to the housing on one side and is linked at the other end to a second hinge point 57, which is located between the first pivot point 47 fixed to the housing and the first side handle 5. Therefore, the second side handle 7 can be displaced in an arc movement relative to the housing 3 around the second pivot point 55 fixed to the housing, so that the second main extension direction 35 can be rotated through a certain angle range relative to the transverse direction 31.

[0037] Provision can be made for two tension springs 43 , 51 to be assigned to each decoupling device 39 , 41 , so that the two tension springs 43 work together with the first lever device 45 and the two tension springs 51 work together with the second lever device 53 .

[0038] With respect to the transverse direction 31, the first pivot point 47 fixed to the housing is arranged between the second pivot point 55 fixed to the housing and the second side handle 7. Therefore, the second pivot point 55 fixed to the housing is arranged between the first pivot point 47 fixed to the housing and the first side handle 5 in the transverse direction 31. In this case, the lever devices 45 and 53 are designed to be bent in opposite ways so that they can move the first side handle 5 and the second side handle 7 simultaneously downward and upward in the direction of the working axis by rotational movement around the respective pivot points 47, 55 fixed to the housing.

[0039] In the embodiment shown, the guard 75 is arranged on the side of the side handle 5, 7 facing the tool holder 11 and has a housing 77 which encloses or surrounds the circumference of the housing 3 of the machining tool 1. The guard 75 is substantially symmetrical with respect to the central longitudinal plane of the machining tool 1.

[0040] In the present case, the protection device 75 is connected to the side handles 5, 7 via a connecting device 78. The connecting device 78 comprises a first lever 79, by means of which the protection device 75 is connected to the first side handle 5, and a second lever 81, by means of which the protection device 75 is connected to the second side handle 9. The first lever 79 has a first hinge point 83 in the region of the first side handle 5 close to the housing, and a second hinge point 84 in the outer region of the protection device 75 in the transverse direction 31. The second lever 81 has a third hinge point 85 in the region of the second side handle 7 close to the housing, and a fourth hinge point 86 in the outer region of the protection device 75 in the transverse direction 31. The second hinge point 84 and the fourth hinge point 86 are therefore arranged in regions of the protection device 75 that are distant from each other in the transverse direction 31.

[0041] During operation of the machining tool 1, the protective device 75 can be moved relative to the housing 3 of the machining tool 1 together with the side handles 5, 7 via the connection with the side handles 5, 7 by means of levers 79 and 81, wherein during operation of the machining tool 1, the protective device 75 can be shifted in the longitudinal direction 9 relative to the housing 3 of the machining tool 1 by means of the interaction between the decoupling device 37 and the levers 79, 81.

[0042] In the rest position of the machining tool 1 shown in the figures, there is a small spacing between the housing 77 of the protection device 75 and the housing 3 of the machining tool 1 transversely to the working axis 9 to prevent the protection device 75 from getting stuck on the housing 3 during operation of the machining tool 1 .

[0043] In order to ensure good protection of the rechargeable batteries 15, 17 connected to the battery interface devices 19, 21 during operation of the machining tool 1, and in particular also in the event that the machining tool 1 falls or drops, the housing 77 of the protective device 75 has a first stop area 87, and the housing 3 has a second stop area 88 which is provided for interaction with the first stop area 87. The first stop area 87 and the second stop area 88 have a defined distance from each other in the longitudinal direction 9 in the rest position of the machining tool 1. If the protective device 75 is displaced during operation of the machining tool 1 or in particular in the event that the machining tool 1 falls or drops in a direction away from the tool holder 11 relative to the longitudinal direction 9, the housing 77 of the protective device 75 contacts the second stop area 88 of the housing 3 via the first stop area 87 after crossing the gap. Thus, additional support of the protective device 75 on the housing 3 and thus also improved protection of the rechargeable batteries 15, 17 connected to the battery interface devices 19, 21 is achieved.

[0044] Furthermore, the protective device 75 in the present case has a third, preferably completely circumferential stop area 89. The housing 3 has a fourth stop area 90, which is provided for interaction with the third stop area 89 of the protective device 75. For example, in the event that the machining tool 1 falls or drops, a portion of the third circumferential stop area 89 of the protective device 75 comes into contact with a portion of the fourth stop area 90 of the housing 3. Preferably, the protective device 75 rests on the housing 3 via a continuous area in the longitudinal direction 9, so that a good supporting effect is achieved and the rechargeable batteries 15, 17 connected to the battery interface devices 19, 21 are particularly well protected.

[0045] Here, the first battery interface device 19 is arranged in the region of the protective device 75 assigned to the first side handle 5, that is, on the same side of the machining tool 1 as the first side handle 5 with respect to the transverse direction 31. Similarly, the second battery interface device 21 is arranged in the region of the protective device 75 assigned to the second side handle 7, that is, on the same side of the machining tool 1 as the second side handle 7 with respect to the transverse direction 31, and on the side of the machining tool 1 opposite to the first side handle 5.

[0046] The first battery interface device 19 is designed to be substantially mirror-symmetrical to the second battery interface device 21 with respect to the working axis 9 , wherein the first battery interface device 19 is described below as also representing the second battery interface device 21 .

[0047] The first battery interface device 19 has a substantially planar base plate 61 and a connection device 63 for accommodating a first rechargeable battery 15, wherein the first rechargeable battery 15 is operatively connected to the connection device 63 via a movement in an insertion direction 65 and can be released from the connection device 63 in a movement direction oriented in the opposite direction. By means of the connection device 63, the second rechargeable battery 17 can be removably connected both mechanically and electrically to the protective device 75 and thus to the machining tool 1. Due to the releasable connection of the first rechargeable battery 15, electrical energy can be transferred from the rechargeable batteries 15, 17 to electrical consumers (e.g. an electric motor) of the machining tool 1. It is possible to supply the machining tool 1 using only a single rechargeable battery.

[0048] In the present case, the insertion direction 65 is oriented perpendicularly to the longitudinal direction 9 and the transverse direction 31 in the front direction 95, but in alternative embodiments it can in principle be oriented as desired and, for example, can extend in the transverse direction 31. Furthermore, the insertion direction 65 can have an angle with respect to the front direction 95, the transverse direction 31 and / or the longitudinal direction 9.

[0049] To accommodate the first rechargeable battery 15, the protective device 75 has a recess 91 which enables the first rechargeable battery 15 to be arranged on the first battery interface device 19 in the insertion direction 65. In alternative embodiments, the recess can also be provided at other locations, so that the rechargeable battery can be arranged on the first battery interface device with essentially any conceivable insertion direction 65.

[0050] In the mounted state of the first protective device 75 , the protective device 75 forms a type of holder with an inner space 93 . In the present case, the protective device 75 is designed such that the rechargeable battery 17 can be arranged completely in the inner space 93 defined by the protective device 75 .

[0051] The protective device 75 can in principle be designed as a single piece or as a plurality of pieces. Provision can be made such that the rechargeable battery, when connected to the battery interface device, is not arranged completely in the interior, but rather projects at least partially out of the interior.

[0052] However, in this case, the protective device 75 is also preferably designed so that: in the event that the machining tool 1 falls or drops in substantially any given direction, the protective device 75 contacts the flat ground surface 97 in substantially any given direction before being connected to the rechargeable battery 15 of the battery interface device 19, so that the rechargeable battery 15 is protected to the desired degree by the protective device 75.

Claims

1. A machining tool (1), in particular a chiseling hammer, comprising a housing (3), a working axis extending in a longitudinal direction (9), at least one rechargeable battery interface device (19, 21) for detachably connecting at least one rechargeable battery (15, 17) to the machining tool (1), and a first side handle (5) having a first main extension direction (33) and a second side handle (7) having a second main extension direction (35), wherein the side handles (5, 7) are arranged substantially symmetrically with respect to the longitudinal direction (9), wherein at least one decoupling device (39, 41) is provided for producing a vibration-damping connection of the side handle (5, 7) to the housing (3), wherein a protective device (75) is provided for protecting a rechargeable battery (15, 17) coupled to the battery interface device (19, 21), and wherein the protective device (75) has an inner space (93) for at least partially accommodating the at least one rechargeable battery (15, 17), characterized in that The protective device (75) encloses the circumference of the housing (3) of the machining tool (1) with respect to the longitudinal direction (9) and is connected to at least one side handle (5, 7) via at least one connecting device (78).

2. The machining tool according to claim 1, characterized in that The connecting device (78) is designed such that the protective device (75) is movable relative to the housing (3) substantially in the longitudinal direction (9).

3. A machining tool according to any one of the preceding claims, characterised in that The connecting device (78) has at least two levers (79, 81), the protection device (75) being connected to the first side handle (5) by means of a first lever (79) and to the second side handle (7) by means of a second lever (81).

4. A machining tool according to any one of the preceding claims, characterised in that The connecting device (78) has at least two flexible elements, the protective device being connected to the first side handle (5) by means of a first flexible element and to the second side handle (7) by means of a second flexible element.

5. The machining tool according to claim 4, characterized in that The flexible element is designed with an elastomeric material.

6. A machining tool according to any one of the preceding claims, characterised in that The protective device (75) has a first stop area (87), and the housing (3) of the machining tool (1) has a second stop area (88), wherein when the protective device (75) is displaced in the longitudinal direction (9) by a value greater than a defined threshold value relative to the housing (3) of the machining tool (1) starting from a rest position, the protective device (75) and the housing (3) of the machining tool (1) contact each other via the stop areas (87, 88).

7. A machining tool according to any one of the preceding claims, characterised in that The protective device (75) has a third stop region (89) and the housing (3) of the machining tool (1) has a fourth stop region (90), the third stop region (89) and the fourth stop region (90) extending substantially in the longitudinal direction (9).

8. A machining tool according to any one of the preceding claims, characterised in that The protective device (75) is arranged on a side of a given side handle (5, 7) facing the tool holder (11) with respect to the longitudinal direction (9).

9. A machining tool according to any one of the preceding claims, characterised in that The protection device (75) has at least two rechargeable battery interface devices (19, 21), which are arranged substantially symmetrically with respect to the longitudinal axis (9).

10. A machining tool according to any one of the preceding claims, characterised in that The protective device (75) has at least one recess (91) for operatively connecting a rechargeable battery (15, 17) to the battery interface device (19, 21), the recess being substantially perpendicular to the longitudinal direction (9) and perpendicular to the transverse direction (31).

11. A machining tool according to any one of the preceding claims, characterised in that The protection device (75) is designed so that: when a rechargeable battery (15, 17) is connected to at least one battery interface device (19, 21) and the machining tool (1) falls in any direction, the protection device (75) contacts a flat ground surface (97) before the rechargeable battery (15, 17) is connected to the battery interface device (19, 21).

12. A machining tool according to any one of the preceding claims, characterised in that A first decoupling device (39) and a second decoupling device (41) are provided, wherein the first decoupling device has a first spring device (43) and a first lever device (45), wherein the first side handle (5) is rotatably articulated at a first pivot point (47) fixed to the housing by means of the first decoupling device, and the second decoupling device has a second spring device (51) and a second lever device (53), wherein the second side handle (7) is rotatably articulated at a second pivot point (55) fixed to the housing by means of the second decoupling device, wherein the first spring device (43) is fixed to the housing on one side and connected to the first lever device (45) on the other side, and wherein the second spring device (51) is fixed to the housing on one side and connected to the second lever device (53) on the other side.

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