Machine tool with protruding assembly

Abstract

Machine tool (1), in particular a hammer drill or chisel hammer, comprising a housing (5) which has a grip region (7), and comprising an assembly (9) including a striking mechanism device (11) and a drive device (13), wherein the assembly (9) is arranged at least partially within the housing (5) and is arranged movably with respect to the housing (5), wherein the striking mechanism device (11) has a striking axis (Z) which defines a longitudinal direction, wherein regions of the assembly (9) protrude out of the housing (5).

Description

[0001] Machine tool with the aforementioned assembly

[0002] The invention relates to a machine tool, in particular a rotary hammer or chisel hammer, according to the preamble of claim 1. Such a machine tool is equipped with a housing having a grip area, and an assembly comprising an impact mechanism and a drive mechanism, wherein the assembly is at least partially arranged inside the housing and is movably arranged relative to the housing, wherein the impact mechanism has an impact axis defining a longitudinal direction.

[0003] EP4331774 A1 describes a machine tool, in particular a rotary hammer or chisel hammer, with a housing having a grip area and an assembly comprising a percussion mechanism and a drive mechanism, wherein the assembly is arranged inside the housing and is movably arranged relative to the housing.

[0004] The object of the invention is to provide a machine tool with a movable assembly, wherein the machine tool is particularly compact and / or easy to handle, especially in confined spaces, while requiring particularly low manufacturing costs.

[0005] The problem is solved according to the invention by a machine tool having the features of claim 1. Preferred embodiments are specified in the dependent claims.

[0006] A machine tool according to the invention is characterized in that the assembly protrudes from the housing in certain areas.

[0007] A fundamental concept of the invention can be seen in an open housing design. The invention recognizes that a nested design, in which the assembly is arranged to move within the housing in a damped manner, regularly requires a comparatively large gap between the housing and the assembly arranged therein in order to absorb and dampen the resulting relative movements, and that this in turn necessitates comparatively voluminous housing dimensions.

[0008] The invention addresses this issue by configuring the assembly to project from the housing in certain areas, so that a portion of the assembly, preferably a portion of the drive unit, can freely swing out of the housing and move in three spatial directions without being enclosed (3D movement). This, in turn, allows the machine tool to be designed to be particularly slim in this region, which can lead to a particularly compact design and / or good handling.

[0009] Unless otherwise stated, all information in this description should preferably apply to a rest position of the machine tool in which it is not in operation.

[0010] As already mentioned, it is particularly preferred that the drive unit of the assembly protrudes from the housing at least partially, and preferably only partially. This allows the dimensions of the machine tool to be further reduced in a structurally particularly simple manner.

[0011] In particular, it can be provided that the assembly, especially preferably the drive unit of the assembly, projects from the housing at least partially, preferably only partially, in a vertical direction perpendicular to the longitudinal direction, wherein the vertical direction is preferably defined by the output axis of the drive unit running in a vertical direction. This can be advantageous from a design perspective.

[0012] It is particularly preferred that the assembly projects at least 1 cm, preferably at least 5 cm or at least 10 cm, from the housing in the vertical direction Y. A typical projection in the vertical direction Y can be in the range of 1 cm to 20 cm.

[0013] In particular, the drive unit can be an electric motor.

[0014] The invention is explained in more detail below with reference to preferred embodiments, which are shown schematically in the accompanying figures. Individual features of the embodiments described below can, in principle, be implemented individually or in any combination within the scope of the invention. The figures schematically show: Fig. 1 a simplified side sectional view of a first embodiment of a machine tool in the machine tool's rest position;

[0015] Fig. 2 shows a sectional view of the machine tool according to Fig. 1 with the cutting plane perpendicular to the vertical direction, in the rest position of the machine tool.

[0016] The figures show a first embodiment of a machine tool 1, which in this case is designed as a rotary hammer or combination hammer, but in an alternative embodiment can also be designed, for example, as a chisel hammer or the like.

[0017] The machine tool 1 is designed in this case as a cordless machine tool with a battery 3, but in an alternative version it can also be designed for mains operation.

[0018] The machine tool 1 is designed here in an angled configuration and has a housing 5 which features a rear, user-accessible D-shaped grip area 7. The housing 5, which can be made of one or more parts, is shown here divided longitudinally Z and designed in a so-called cup-shaped construction. Alternatively, the housing 5 can also have, in particular, two housing halves that can be joined together in the transverse direction X and be designed in a so-called shell-shaped construction.

[0019] Within the housing 5, an assembly 9 is arranged, comprising a conventionally designed striking mechanism 11 and a drive unit 13 designed as an electric motor, which is configured to drive the striking mechanism 11. The assembly 9 is L-shaped in this case. The drive unit has an output shaft extending along an output axis 99, which drives the striking mechanism 11.

[0020] The machine tool 1, in particular its impact mechanism 11, has a tool holder in a conventionally known manner, via which a tool 17, for example a chisel or the like, can be detachably connected to the impact mechanism 11. By means of the assembly 9, chisel operation is possible in this case, whereby a tool 17 held in the impact mechanism 11 is moved back and forth in an oscillating motion in the direction of an impact axis 19. In hammer drilling operation, the tool 17 additionally performs a rotary motion about the impact axis 19. The figures also show a longitudinal direction Z, a vertical direction Y, and a transverse direction X. X, Y, and Z are axes of a Cartesian coordinate system and are each perpendicular to one another. The longitudinal direction Z is coincident with the impact axis 19 without the application of an external force. The impact axis 19 is defined by a central axis of the tool 17 held in the tool holder.The tool holder is defined. The vertical direction Y is parallel to the output axis 99 without the application of an external force.

[0021] The assembly 9 can have a separate inner housing 21, which in particular encloses the percussion device 11 and the drive device 13, or within which the percussion device 11 and the drive device 13 are in particular arranged almost completely or completely.

[0022] An example of a front decoupling device 23 and a rear decoupling device 25 is shown, which can generally be designed with one or more decoupling devices. In the embodiment shown, the front decoupling device 23 is arranged longitudinally Z in front of the rear decoupling device 25, i.e., closer to the tool holder and in an area facing away from the rear grip area 7.

[0023] An example is a front handle area 27 or side handle, which can be detachably connected to the housing 5 in the area of ​​the front decoupling device 23, for example by means of a tension band. In this case, the front handle area 27 extends essentially in the transverse direction X, but can be arranged on the housing 5 in a way that is continuously adjustable in the circumferential direction relative to the longitudinal direction Z.

[0024] The assembly 9 is mounted relative to the housing 5 via both the front decoupling device 23 and the rear decoupling device 25, whereby the assembly 9 is displaceable relative to the housing 5 in the longitudinal direction Z, the transverse direction X, and the vertical direction Y in both the area of ​​the front decoupling device 23 and the area of ​​the rear decoupling device 25. The displacement s in the longitudinal direction Z is, for example, a maximum of approximately 10 mm, but in other embodiments it can be up to 20 mm or more. The displacement in the transverse direction X and in the vertical direction Y is essentially identical in this case, with the displacement s in the longitudinal direction Z being approximately 7 times greater at the front bearing and 3-4 times greater in a rear, rearward area than the displacement in the transverse direction X and in the vertical direction Y.To define a maximum path of movement in the transverse direction X, in the vertical direction Y and in the longitudinal direction Z, stops 37 (namely 37a, 37b, 37c, 37d, 37e, 37f, 37g) are provided, each defining a defined end position of the assembly 9 relative to the housing 5. The number and position of the stops 37 are generally freely selectable, with at least one, and in particular two, stops 37 preferably being provided on both sides of the assembly 9 for each direction X, Y and Z.

[0025] The assembly 9 is shown in the figures in its rest position, in which the machine tool 1 is not operated, or in which the assembly 9 is in its front end position, resting against a front stop 37a. In the illustrated embodiment, a first lateral stop 37d and a second lateral stop 37e are provided, which restrict the movement of the assembly 9 relative to the housing 5 in the transverse direction X. Furthermore, an upper stop 37f and a lower stop 37g are provided, which restrict the movement of the assembly 9 relative to the housing 5 in the vertical direction Y.

[0026] The rear decoupling device 25 can have two first decoupling devices 31, 33 and a second decoupling device 35.

[0027] The second decoupling device 35 of the rear decoupling device 25 has spring properties and / or damping properties in the longitudinal direction Z and is designed here as a spring device with an axis of action essentially in the longitudinal direction Z, whereby an effect in the Y and / or X direction may also be given.

[0028] The spring assembly, designed here as a cylindrical helical spring, presses the assembly 9 into the front end position relative to the housing 5, in which the assembly 9 rests against the front stop 37a. Several spring assemblies can also be provided, for example, two spring assemblies spaced apart from each other in the transverse direction X.

[0029] The first decoupling devices 31, 33 can be essentially identical in design, with the first decoupling device 31 being arranged on a left side of the machine tool 1 between the assembly 9 and the housing 5, and the first decoupling device 33 being arranged on a right side of the machine tool 1 between the assembly 9 and the housing 5. In principle, only one such first decoupling device 31, 33 can be provided, arranged at any position between the assembly 9 and the housing 5 (the system can also function without decoupling devices 31, 33).

[0030] As an example, a further first decoupling device 29 is shown, which is arranged in a lower area of ​​the machine tool 1 in the vertical direction Y between the assembly 9 and the housing 5. The further first decoupling device 29 is optional and can improve spring and / or damping characteristics if necessary.

[0031] As can be seen particularly in Figure 1, the assembly 9 protrudes from the housing 5 in certain areas, namely on the underside of the housing 5 and in the vertical direction Y. In the rest position of the machine tool 1 shown in the figures, there is a projection d p given in the upward direction Y, where this overhang d ppreferably 1 cm or more. In particular, the drive unit 13 and the inner housing 21 protrude from the housing 5 in the area of ​​the drive unit 13 in the rest position of the machine tool 1 shown in Figure 1. Thus, the drive assembly 13, which is operatively connected to the impact mechanism 11, hangs freely from the housing 5 and can move in all three spatial directions X, Y, and Z.

Claims

PATENT CLAIMS 1. Machine tool (1), in particular a rotary hammer or chisel hammer, with a housing (5) having a grip area (7), and an assembly (9) comprising a percussion mechanism (11) and a drive mechanism (13), wherein the assembly (9) is arranged at least partially within the housing (5) and is movably arranged relative to the housing (5), wherein the percussion mechanism (11) has a percussion axis (19) defining a longitudinal direction (Z), characterized in that the assembly (9) projects out of the housing (5) in certain areas.

2. Machine tool according to claim 1, characterized in that the drive device (13) of the assembly (9) protrudes at least partially from the housing (5).

3. Machine tool according to one of the preceding claims, characterized in that the assembly (9) projects from the housing in a vertical direction (Y) perpendicular to the longitudinal direction (Z).

4. Machine tool according to claim 3, characterized in that an output axis of the drive device (13) extends in the vertical direction (Y).

5. Machine tool according to one of claims 3 or 4, characterized in that the assembly (9) projects at least 1 cm out of the housing (5) in the vertical direction (Y).

6. Machine tool according to one of the preceding claims, characterized in that the drive device (13) is an electric motor.

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