Machine tool having a protective element

Abstract

The invention relates to a machine tool (1), in particular a chisel hammer, comprising a housing (3), a work axis (9) extending in a longitudinal direction, at least one battery interface device (19, 21) for releasably connecting at least one battery (15, 17) to the machine 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). The side handles (5, 7) are arranged substantially symmetrically with respect to the work axis (9). At least one decoupling device (39, 41) is provided for connecting the side handles (5, 7) to the housing (3) in a vibration-damping manner. At least one battery interface device (19, 21) is coupled to one side handle (5, 7). At least one protective device (75, 77) is provided for protecting a battery (15, 17) which is coupled to the battery interface device (19, 21). The at least one protective device (75, 77) has an interior (93) for accommodating at least part of the at least one battery (15, 17). At least one protective device (75, 77) is directly connected to the housing (3) or is an integral part of the housing (3).

Description

[0001] Machine tool with a protective element

[0002] The present invention relates to a machine tool, in particular a chisel hammer, according to the type defined in more detail in the preamble of patent claim 1.

[0003] DE 10 2018 210 189 A1 discloses a percussion hammer with a housing, wherein a center of gravity of the power tool is arranged substantially on the working axis. The power tool has a battery interface via which a battery pack can be detachably connected to the power tool. The handles are each connected to the housing via a damping unit. It is further disclosed that the battery pack is arranged below a handle and protected by a protective element connected to the handle.

[0004] Disadvantageously, protection of the battery pack in such a design may be inadequate or undesirably low, particularly in the event of a fall of the machine tool or impact.

[0005] It is an object of the present invention to provide a machine tool, in particular a chisel hammer, in which protection for accumulators connected to the machine tool is improved.

[0006] The object is achieved by the subject matter of independent claim 1. Further advantageous embodiments of the invention can be found in the corresponding subclaims.

[0007] A machine tool, in particular a chisel hammer, is proposed, comprising a housing, a working axis extending in a longitudinal direction, at least one battery interface device for a releasable connection of at least one battery to the machine tool and a first side handle and a second side handle, wherein the side handles are arranged substantially symmetrically to the working axis, wherein at least one decoupling device is provided for the vibration-damping connection of the side handles to the housing, wherein at least one battery interface device is coupled to a side handle, wherein at least one protective device is provided for protecting a battery coupled to the battery interface device, and wherein the at least one protective device has an interior space for at least partially accommodating the at least one battery.According to the invention, it is proposed that the protective device is directly connected to the housing or is an integral part of the housing.

[0008] A machine tool designed according to the invention has the advantage that at least one rechargeable battery connected to the at least one rechargeable battery interface device is protected from damage to the desired extent in a simple manner, particularly in all operating states of the machine tool. This is achieved by the housing-fixed arrangement of the protective device, which makes the protective device particularly stable and robust and transfers forces acting on it directly to the housing of the machine tool. In the design according to the invention, the protective device is arranged on the housing independently of the decoupling device. With the solution according to the invention, the protective device is therefore not subject to the damping properties of the decoupling device, whereby improved protection of a rechargeable battery connected to the battery interface device can be achieved.

[0009] Furthermore, the decoupling device is also particularly well protected by the housing-fixed arrangement of the at least one protective device, since the at least one decoupling device is at least not directly exposed to blows, impacts or the like, for example in the event of a fall or fall of the machine tool, due to the non-direct connection to the protective device.

[0010] Furthermore, the at least one battery interface device connected to a side handle provides for decoupling of a battery connected to the battery interface device from the housing during operation of the machine tool, so that vibrations and shocks occurring during operation of the machine tool act on the battery interface device and thus also on a battery connected to the battery interface device, in particular to a greatly reduced extent.

[0011] The connection of the protective device to the housing can be either permanent or detachable.

[0012] The first side handle and the second side handle each define a first main direction of extension and a second main direction of extension, respectively, wherein the main directions of extension are arranged, in an unloaded state of the side handles, in particular substantially perpendicular to the longitudinal direction and extend substantially in a transverse direction. A center of gravity of the machine tool in an upright position preferably lies substantially on the working axis. By arranging the battery interface device on the first and / or second side handle, the installation height of the machine tool in the longitudinal direction is advantageously low. Furthermore, when the battery is arranged on the battery interface device, the battery advantageously does not obstruct a user's view of the machine tool.Furthermore, compared to arranging the battery interface device in an end region of the machine tool facing away from a tool holder, the center of gravity of the proposed machine tool is advantageously arranged close to a machining surface. This also reduces the maximum drop height of a battery connected to the battery interface device during operation of the machine tool compared to arranging the battery in an end region of the machine tool facing away from the tool holder, thus reducing the risk of damage to a battery connected to the battery interface device.

[0013] The decoupling device reduces the mechanical impacts, such as shocks, impacts, or similar, that affect a user holding the power tool by the side handles during operation. Furthermore, the decoupling device also protects a battery connected to the battery interface device from mechanical impacts, and its impact on a battery connected to the battery interface device is significantly reduced.

[0014] In an advantageous embodiment of a machine tool according to the invention, at least two battery interface devices are provided, wherein a first battery interface device is operatively connected to a first side handle and a second battery interface device is operatively connected to a second side handle, wherein each battery interface device is assigned a respective protective device. Furthermore, it can also be provided that a common protective device is provided for at least two battery interface devices.

[0015] A protective device can be particularly easily arranged on the housing using a screw connection. This makes it easy to replace a protective device. Alternatively or additionally, it can also be provided that at least one protective device can be arranged on the housing using at least one clamp connection, for example, a tensioning strap or the like.

[0016] The arrangement of a protective device is particularly simple and the freedom in designing the protective device is particularly great if at least one protective device is designed at least in two parts. In an advantageous embodiment of a machine tool according to the invention, at least one interior space of a protective device is designed such that, when a battery is connected to a battery interface device, a movement of at least one associated battery in a direction of movement or about a rotation axis is possible within a defined extent. In this way, contact between the protective devices arranged so as to be movable relative to one another and a battery connected to a battery interface device can be reliably prevented in a simple manner during operation of the machine tool.

[0017] In an advantageous embodiment of a machine tool according to the invention, at least one protective device is configured such that, when the battery is connected to the battery interface device and the machine tool falls in any direction, the at least one protective device comes into contact with a flat surface in front of the battery connected to the battery interface device. This ensures particularly good protection of a battery connected to a battery interface device in any operating situation.

[0018] An improved embodiment of the invention with respect to a center of gravity, a view of a user in the direction of a work area and a structural length of the machine tool is achieved if the battery interface devices are arranged with respect to the longitudinal direction on a side of the respective side handle facing a tool holder and are in particular directly connected to the respective side handle.

[0019] To enable a battery to be arranged in a simple insertion direction on the respective battery interface device, at least one protective device can have a recess oriented substantially in the transverse direction for operatively connecting a battery to the battery interface device. In principle, the protective device can also be designed in such a way that it allows a battery to be arranged on the respective battery interface device in any insertion direction.

[0020] An insertion device for operatively connecting a rechargeable battery to a rechargeable battery interface device can have an angle relative to a main extension direction of the respective side handle, wherein the angle is between -30° and 90°, in particular between 0° and 30° and is preferably approximately 20°.

[0021] In an advantageous embodiment of a machine tool according to the invention, at least one battery interface device has at least two connection areas for connecting the respective battery interface device to the respective side handle, wherein two connection areas are spaced apart from one another in the transverse direction. In this way, a secure and stable connection of the battery interface device to the respective side handle can be achieved.

[0022] In an advantageous development of the invention, the battery interface device can be flexibly connected to the respective side handle in at least one connection area. This allows additional damping of a battery connected to the battery interface device to be achieved. This can be particularly advantageous if the decoupling device of the respective side handle is in an extreme position in an operating state in which the damping properties of the decoupling device are reduced or the decoupling device has no damping properties. Furthermore, it can also be provided that the battery interface device is articulated to the respective side handle in at least one connection area. It can also be provided that the battery interface device is firmly or rigidly connected to the respective side handle in both connection areas.

[0023] In an advantageous embodiment of the invention, in order to decouple the side handles from the housing, a first decoupling device is provided, which has a first spring device and a first lever device, by means of which the first side handle is rotatably connected to a first pivot point fixed to the housing, and a second decoupling device is provided, which has a second spring device and a second lever device, by means of which the second side handle is rotatably connected to a second pivot point fixed to the housing, wherein the first spring device is mounted on the one hand so that it is fixed to the housing and on the other hand is connected to the first lever device, and wherein the second spring device is mounted on the one hand so that it is fixed to the housing and on the other hand is connected to the second lever device. The spring devices are designed in particular as tension springs and reduce vibrations acting on the side handles during operation of the machine tool.

[0024] Further advantages will become apparent from the following description of the figures. Various embodiments of the present invention are illustrated in the figures. The figures, the description, and the claims contain numerous features in combination. Those skilled in the art will also expediently consider the features individually and combine them into useful further combinations.

[0025] Shown are: Fig. 1 a side view of a machine tool designed as a chisel hammer with a chisel arranged in a tool holder, the machine tool being shown in an unloaded rest state;

[0026] Fig. 2 is a three-dimensional view of the chisel hammer according to Fig. 1;

[0027] Fig. 3 is a side view of the chisel hammer according to Fig. 1 and Fig. 2, corresponding to Fig. 1, wherein the chisel hammer is shown without a housing part; and

[0028] Fig. 4 is a side view of the chisel hammer according to Fig. 1 to Fig. 3 arranged on a flat surface.

[0029] Examples of implementation:

[0030] In Fig. 1 to Fig. 4, a machine tool 1 is shown in the form of a chisel hammer. However, it is also possible for the machine tool 1 to be designed in the form of a screwdriver, a drill, a hammer drill, or the like.

[0031] The machine tool 1, designed as a chisel hammer, is shown in the figures in a rest position, i.e., a non-actuated state, and has a housing 3, which can be constructed in one piece or in multiple parts. Furthermore, the machine tool 1 has a first side handle 5 and a second side handle 7, which are arranged essentially symmetrically to a working axis 9, which defines a longitudinal axis or longitudinal direction of the machine tool 1. In the present case, a tool holder 11 engages a tool 13 designed as a chisel, which lies in the working axis 9.

[0032] The interior of the housing 3 essentially contains an electric motor and a percussion device. The percussion device can also be referred to as a percussion mechanism or percussion mechanism device. The electric motor and the percussion device are connected to each other in such a way that pulse-like impacts are generated and transmitted to the tool holder 11. Neither the electric motor nor the percussion device are shown in the figures.

[0033] To supply the machine tool 1, and in particular the electric motor, with electrical energy, a first accumulator 15 and a second accumulator 17 are provided, wherein the first accumulator 15 is operatively connected to a first battery interface device 19 and the second accumulator 17 is operatively connected to a second battery interface device 21. According to an alternative embodiment, it is also possible for only one accumulator or more than two accumulators to be used.

[0034] The housing 3 has a lower end 23 in the longitudinal direction 9, in the area of ​​which the tool holder 11 is provided, and an opposite upper end 25. Furthermore, the housing 3 has a first side region 27 and a second side region 29. The side regions 27, 29 form opposite boundaries of the housing 3 in the transverse direction 31. The transverse direction 31 is perpendicular to the working axis 9 and, in this case, is essentially identical to the main extension directions 33, 35 of the side handles 5, 7 in the idle state of the machine tool 1.

[0035] The first side handle 5 is arranged in the first side region 27 and the second side handle 7 in the second side region 29 of the housing 3.

[0036] A decoupling device 37 is provided, which can be seen in more detail in Fig. 3, by means of which the side handles 5 and 7 are decoupled to a certain extent from the housing 3 and thus from shocks, vibrations and the like transmitted to the housing 3 via the chisel 13 during operation of the machine tool 1.

[0037] The decoupling device 37 in the present case 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, wherein the first lever device 45 is articulated on the one hand to a first pivot point 47 fixed to the housing and on the other hand is connected to the first side handle 5. The first tension spring 43 is mounted on the one hand so that it is fixed to the housing and on the other hand is connected to a first articulation point 49 which lies between the first pivot point 47 fixed to the housing and the first side handle 5.The first side handle 5 can thus be displaced relative to the housing 3 in a circular segment-shaped movement about the first pivot point 47 fixed to the housing, so that the first main extension direction 33 can be rotated relative to the transverse direction 31 by a certain angular range.

[0038] Comparably, the second decoupling device 41 has a second spring device designed as a tension spring 51 and a second lever device 53, wherein the second lever device 53 is articulated on the one hand to a second pivot point 55 fixed to the housing and on the other hand is connected to the second side handle 7. The second tension spring 51 is mounted on the one hand so that it is fixed to the housing and on the other hand is connected to a second articulation point 57 which lies between the first pivot point 47 fixed to the housing and the first side handle 5. The second side handle 7 can thus be displaced relative to the housing 3 in a circular segment-shaped movement about the second pivot point 55 fixed to the housing, so that the second main extension direction 35 can be rotated relative to the transverse direction 31 by a certain angular range.

[0039] The first housing-fixed pivot point 47 is arranged in the transverse direction 31 between the second housing-fixed pivot point 55 and the second side handle 7. Consequently, the second housing-fixed pivot point 55 is arranged in the transverse direction 31 between the first housing-fixed pivot point 47 and the first side handle 5. The lever devices 45 and 53 are bent in opposite directions such that they enable simultaneous movement of the first side handle 5 and the second side handle 7 downwards and upwards in the direction of the working axis by means of a rotational movement about the respective housing-fixed pivot point 47 or 55.

[0040] It can be provided that each decoupling device 39, 41 is assigned two tension springs 43, 51, so that two tension springs 43 interact with the first lever device 45 and two tension springs 51 interact with the second lever device 53.

[0041] The first battery interface device 19 is arranged on the first side handle 5. Similarly, the second battery interface device 21 is arranged on the second side handle 7. The first battery interface device 19 is designed essentially mirror-symmetrically to the second battery interface device 21, whereby the connection of the second battery interface device 21 to the second side handle 7 is described below as representative of the connection of the first battery interface device 19 to the first side handle 5.

[0042] The second battery interface device 21 has a substantially flat base plate 61 and a connection device 63 for receiving the second battery 17, wherein the second battery 17 is operatively connected to the connection device 63 via a movement in the insertion direction 65 and can be detachably connected to the connection device 63 in an oppositely oriented direction of movement. With the aid of the connection device 63, the second battery 17 can be detachably connected to the machine tool 1 both mechanically and electrically. Through the detachable connection of the second battery 17, electrical energy can be supplied from the batteries 15, 17 to the consumers, e.g., the electric motor, of the machine tool 1. It is possible for only a single battery to be used to supply the machine tool 1.The insertion direction 65 has an angle 67 with respect to the second main extension direction 35 of the second side handle 7, wherein the angle 67 in the present case is approximately 20°.

[0043] The second battery interface device 21 here has a first connection area 69 and a second connection area 71, wherein the second battery interface device 21 is connected to the second side handle 7 via the two connection areas 69 and 71 without a connection fixed to the housing. The first connection area 69 and the second connection area 71 are arranged at a distance from one another in the transverse direction 31, wherein the first connection area 69 is arranged in a region facing the working axis 9 and the second connection area 71 is arranged in a region facing the second side handle 7. In the first connection area 69, the second battery interface device 21 is essentially rigidly connected to the second side handle 7 in an area bordering the housing 3.The second connection area 71 is designed to be flexible in the present case and allows a movement of the second battery interface device 21 relative to the second side handle 7, so that an additional decoupling of the second battery interface device 21 relative to the housing 3 is thereby created.

[0044] Each battery interface device 19, 21 is assigned a protective device 75 or 77, which protects the batteries 15 or 17 from impact in the event of a fall or tipping of the machine tool 1, as shown in simplified form in Fig. 4. The protective devices 75 are designed such that, for example, if the machine tool 1 tips over, in any operating state, the respective battery 15 or 17 comes into contact with a surface 79 of a base (which is flat here), and thereby protects the respective battery 15, 17 from impact. Both the first protective device 75 and the second protective device 77 are arranged on the housing 3, so that the first battery interface device 19 or the second battery interface device 21 can be displaced relative to the first protective device 75 or the second protective device 77.

[0045] The first protective device 75 and the second protective device 77 are arranged and configured essentially mirror-symmetrically to the working axis 9. The second protective device 77 is described in more detail below as a representative of the first protective device 75.

[0046] The second protective device 77 is in this case designed in two parts with a first part 81 and a second part 83, wherein the first part 81 can be detachably connected to the second part 83, in particular via a plurality of screw connections. The interconnected parts 81, 83 can be detachably arranged on the housing 3 via a plurality of screw connections. By connecting the protective devices 77, 79 to the housing 3, particularly good protection of the batteries 15, 17 can be achieved. According to an alternative embodiment, it can also be provided that the first part and / or the second part is firmly, i.e. non-detachably, connected to the housing 3 of the machine tool 1 and, for example, is formed integrally with the housing 3.

[0047] In this case, the first part 81 and the second part 83 comprise a circumferential frame 85 and 87, respectively, or brackets, which are connected to one another via one or more connecting elements 89. Preferably, the connecting elements 89 are formed jointly by the first part 81 and the second part 83. Preferably, the connecting elements 89 are arranged on a side of the protective devices 77, 79 facing the tool holder 11.

[0048] The second protective device 77 has a recess 91 that allows the rechargeable battery 17 to be arranged in the insertion direction 65 on the second battery interface device 21. In alternative embodiments, the recess can also be provided at other positions, so that the rechargeable battery can be arranged on the second battery interface device with insertion directions 65 that are essentially oriented in almost any desired direction.

[0049] In an assembled state of the second protective device 77, ie when the two parts 81 and 83 are connected to one another and attached to the housing 3 of the machine tool 1, the protective device 77 forms a type of cage with an interior space 93. The protective device 77 is designed in this case such that the accumulator 17 can be arranged completely in the interior space 93 defined by the protective device 77.

[0050] The interior space 93 of the protective device 77 is designed in such a way that the accumulator 17 can be displaced around the housing-fixed pivot point 55 by a defined angular range, which occurs in particular during operation of the machine tool 1, without coming into contact with the protective device 77.

[0051] In alternative embodiments, the protective device 77 can also be a single-piece or multi-piece. In alternative embodiments, the parts 81, 83 can, in principle, be designed in any desired manner and do not have to form a surrounding frame. Furthermore, it can also be provided that, when the machine tool is unloaded, the accumulator is not arranged entirely within the interior, but rather protrudes at least partially from the interior. In this case, however, the protective device is preferably also designed such that, if the machine tool falls or crashes in any direction, the protective device first comes into contact with a flat surface.

Claims

Patent claims:

1. Machine tool (1), in particular a chisel hammer, comprising a housing (3), a Longitudinally extending working axis (9), at least one battery interface device (19, 21) for a releasable connection of at least one battery (15, 17) to the machine tool (1) and a first side handle (5) with a first main extension direction (33) and a second side handle (7) with a second main extension direction (35), wherein the side handles (5, 7) are arranged substantially symmetrically to the working axis (9), wherein at least one decoupling device (39, 41) for the vibration-damping connection of the Side handles (5, 7) are provided on the housing (3), wherein at least one battery interface device (19, 21) is coupled to a side handle (5, 7), wherein at least one protective device (75, 77) is provided for protecting a battery (15, 17) coupled to the battery interface device (19, 21), and wherein the at least one protective device (75, 77) has an interior space (93) for at least partially accommodating the at least one battery (15, 17), characterized in that at least one protective device (75, 77) is connected directly to the housing (3) or is an integral part of the housing (3).

2. Machine tool according to claim 1, characterized in that at least two battery interface devices (19, 21) are provided, wherein a first battery interface device (19) is operatively connected to a first side handle (5) and a second battery interface device (21) is operatively connected to a second side handle (7), wherein each battery interface device (19, 21) is assigned a respective protective device (75, 77).

3. Machine tool according to one of claims 1 or 2, characterized in that at least one protective device (75, 77) is arranged on the housing (3) by means of at least one screw connection.

4. Machine tool according to one of the preceding claims, characterized in that at least one protective device (75, 77) is arranged on the housing (3) by means of at least one clamping connection.

5. Machine tool according to one of the preceding claims, characterized in that at least one protective device (75, 77) is designed in at least two parts (81, 83).

6. Machine tool according to one of the preceding claims, characterized in that at least one interior space (93) of a protective device (75, 77) is designed such that, when the accumulator (15, 17) is connected to a battery interface device (19, 21), a movement of at least one associated accumulator (15, 17) in a direction of movement or about an axis of rotation (47, 55) is made possible within a defined extent.

7. Machine tool according to one of the preceding claims, characterized in that at least one protective device (75, 77) is designed such that when the battery (15, 17) is connected to the battery interface device (19, 21) and the machine tool (1) falls in any direction, the at least one protective device (75, 77) comes into contact with a flat surface (79) in front of the battery (15, 17) connected to the battery interface device (19, 21).

8. Machine tool according to one of the preceding claims, characterized in that the battery interface devices (19, 21) are arranged with respect to the longitudinal direction (9) on a side of the respective side handle (5, 7) facing a tool holder (11).

9. Machine tool according to one of the preceding claims, characterized in that at least one protective device (75, 77) has a recess (91) pointing substantially in the transverse direction (31) for the operative connection of a battery (15, 17) to the battery interface device (19, 21).

10. Machine tool according to one of the preceding claims, characterized in that an insertion direction (65) for connecting a battery (15, 17) to a battery interface device (19, 21) forms an angle (67) with respect to a Main extension direction (33, 35) of the respective side handle (5, 7), wherein the angle (67) is between -30° and 90°, in particular between 0° and 30° and is preferably approximately 20°. 11 . Machine tool according to one of the preceding claims, characterized in that at least one battery interface device (19, 21) has at least two Connection areas (69, 71) for connecting the respective battery interface device (19, 21) to the respective side handle (5, 7), wherein two connection areas (69, 71) are spaced apart from one another in the transverse direction (31).

12. Machine tool according to claim 11, characterized in that the battery interface device (19, 21) is flexibly connected to the respective side handle (5, 7) in at least one connection area (69, 71).

13. Machine tool according to one of the preceding claims, characterized in that a first decoupling device (39) having a first spring device (43) and a first lever device (45) by means of which the first side handle (5) is rotatably connected to a first pivot point (47) fixed to the housing, and a second decoupling device (41) having a second spring device (51) and a second lever device (53) by means of which the second side handle (7) is rotatably connected to a second pivot point (55) fixed to the housing, are provided, wherein the first spring device (43) is mounted on the one hand so that it is fixed to the housing and on the other hand is connected to the first lever device (45), and wherein the second spring device (51) is mounted on the one hand so that it is fixed to the housing and on the other hand is connected to the second lever device (53).

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