EP3615269A1

EP3615269A1 - Machine tool having adjustable handle assembly

Info

Publication number: EP3615269A1
Application number: EP18723713.6A
Authority: EP
Inventors: Thomas Blatz
Original assignee: Hilti AG
Current assignee: Hilti AG
Priority date: 2017-04-26
Filing date: 2018-04-18
Publication date: 2020-03-04
Anticipated expiration: 2038-04-18
Also published as: EP3615269B1; WO2018197280A1; EP3395500A1

Abstract

The invention relates to a machine tool (2), comprising a machine tool housing (4) and a handle assembly (6), which can be adjusted in the angular position thereof relative to the machine tool housing (4), the handle assembly (6) containing: at least one handle (10) having at least one coupling element (26), which handle, relative to at least one counter coupling element (30) of the machine tool housing (4), is adjustable in the angular position of said handle and is linearly movable along a movement axis (X), and a locking mechanism (8), which is designed to fix the handle (10) in a coupled state, in which the coupling element (26) of the handle (10) is in engagement with the counter coupling element (30) of the machine tool housing (4), such that the handle (10) and the machine tool housing (4) are fixedly connected to each other, and to release the handle in an uncoupled state, in which the coupling element (26) of the handle (10) is disengaged from the counter coupling element (30) of the machine tool housing (4), such that the handle (10) can be adjusted in the angular position thereof relative to the machine tool housing (4), the locking mechanism (8) containing: an eccentric lever (36) having a first end (44) and a second end (46), which eccentric lever can be reversibly pivoted about a pivot axis (S), which extends perpendicularly to the movement axis (X) and is provided in the region of the second end (46), between a locking position and a release position, at least one bearing element (38) for pivotably supporting and retaining the eccentric lever (36), and a stop (74) for the eccentric lever (36) for defining a predetermined distance between the pivot axis (S) and the counter coupling element (30) of the machine tool housing (4), at least one cam contour (52) being provided at the second end (46) of the eccentric lever (36), the center point (54) of which cam contour lies outside of the pivot axis (S), such that the handle (10) is transferred into the coupled state by pivoting of the eccentric lever (36) into the locking position and is released into the uncoupled state by pivoting of the eccentric lever (36) into the release position.

Description

Hilti Aktiengesellschaft in Schaan Principality of Liechtenstein

"Machine tool with adjustable handle arrangement"

The invention relates to a machine tool, in particular a hand-held machine tool, with a machine tool housing and with respect to the machine tool housing in its angular position adjustable handle assembly. The handle assembly includes at least one handle having at least one coupling means which is adjustable relative to at least one counter-coupling means of the machine tool housing in its angular position and linearly movable along a movement axis. Further, the handle assembly stops a locking mechanism, which is adapted to fix the handle in a coupled state, in which the coupling means of the handle is in engagement with the counter-coupling means of the machine tool housing, so that the handle and the machine tool housing are firmly connected to each other, and in one release decoupled state in which the coupling means of the handle is out of engagement with the negative feedback means of the machine tool housing, so that the handle is adjustable relative to the machine tool housing in its angular position.

Machine tools of the type mentioned are known from the prior art. Machine tools, especially hand-held machine tools, such as hand grinders, are typically provided with a rigid, rear guide handle near the on / off switch and a frequently movable, partially removable front handle. The front handle is usually designed rod or bow-shaped. In the bow-shaped embodiment, the front handle is usually pivotable about the attachment point to the machine tool housing in order to adapt the ergonomics of the machine tool to different working conditions, such as grinding or cutting on a surface, in corners or niches etc.

The adjustment of the front handle is done in most cases via a clamping screw, which presses the front handle in a planer teeth. The tightening screw can be tightened with a gag (similar to a "wing nut") or with a tool, taking into account that if the tightening screw is insufficiently preloaded, the connection between the front handle and the machine tool housing may loosen It is not clear when the tightening screw is tightened enough, which is compounded by the fact that the clamping forces can be achieved without tools are limited. In addition, especially when the front handle must be adjusted frequently, many turns on the clamping screw for the user annoying.

It is the object of the present invention to provide a machine tool of the aforementioned type, which does not have or at least reduces the abovementioned disadvantages of the hand-held machine tools known from the prior art.

To achieve the object, the present invention proposes that the locking mechanism of a machine tool according to the invention comprises an eccentric lever with a first end and a second end which is reversible about a pivot axis perpendicular to the movement axis and provided in the region of the second end between a locking position and a release position is pivotable. The locking mechanism further includes at least one bearing member for pivotably supporting and holding the eccentric lever and a stop for the eccentric lever for defining a predetermined distance between the pivot axis and the counter-coupling means of the machine tool housing. At least a cam contour is provided at the second end of the eccentric lever, the center of which lies outside the pivot axis, so that the handle is transferred by pivoting the eccentric lever into the locked position in the coupled state and released by pivoting the eccentric lever in the release position in the decoupled state.

In the machine tool according to the invention, therefore, the locking position of the eccentric lever is associated with the coupled state of the handle and the release position of the eccentric lever the decoupled state of the handle. In other words, the functional states of the handle, ie its coupled or decoupled state, are unequivocally defined by the two end positions of the eccentric lever, that is to say the locking and releasing position. The locking mechanism of the machine tool according to the invention can be adjusted without tools within a few seconds.

In order to transfer the eccentric lever from its locking position to its release position (or vice versa), the eccentric lever is pivoted about its pivot axis, which is eccentric to the center of the cam contour of the eccentric lever. The assignment between the states of the eccentric lever and the handle thus takes place via the at least one cam contour of the eccentric lever. If the eccentric lever is in its locking position, the coupling means of the handle and the counter-coupling means of the machine tool housing interlock, wherein the cam contour prevents a displacement of the handle along the movement axis. The handle and the machine tool housing are firmly connected. On the other hand, the eccentric lever is in its Release position, allows the cam contour to move the handle along the axis of motion. Then, for example, the handle may be manually displaced along the moving axis to release the coupling means of the handle from the counter coupling means of the machine tool housing.

However, it is preferred that the locking mechanism includes a spring element disposed between the machine tool housing and the handle, which transfers the handle from the coupled state to the decoupled state.

Preferably, the coupling means of the handle and the counter-coupling means of the machine tool housing form a planer toothing.

In order to be able to adjust the clamping force acting on the handle and the force to be applied by the user when the eccentric lever is pivoted, it is further preferred that the position of the stop be adjustable along the axis of movement.

According to a further preferred embodiment, the machine tool housing has a dome extending along the movement axis for mounting the handle arrangement. The dome may comprise a core hole, so be hollow cylindrical and have an internal thread. In this case, the stop for the eccentric lever can be provided on an adjusting screw with an external thread, which is screwed into the internal thread of the hollow cylindrical dome.

In the case of a two-sided grip connection, the adjustment screw can alternatively be extended to the opposite side of the machine tool housing and fixed at a second attachment point of the handle. Next alternatively, the dome in the machine tool housing can be designed as a separate axis or sleeve, which is connected to the opposite side of the handle.

According to a preferred embodiment, the adjusting screw is hollow cylindrical and has in addition to the external thread on an internal thread. To secure the adjusting screw in its axial position within the dome, a counter-screw with an external thread can be screwed into the adjusting screw. The lock screw is preferably supported on the bottom of the core hole in the dome in order to clamp the adjusting screw firmly in the core hole of the cathedral. A loosening of the adjusting screw is thus prevented.

According to a further preferred embodiment, the eccentric lever has two legs which each provide a cam contour at the second end of the eccentric lever and have a pivot. The pivots or their centers define in this case the pivot axis of the eccentric lever. In this way, the eccentric lever can embrace the dome with the two legs, which favors a compact design.

In order to ensure the most compact possible construction of the handle assembly, it can further be provided that the at least one bearing element is a bearing block, which is arranged between the legs of the eccentric lever. Furthermore, the bearing block can have two support elements, each with a recess, wherein the recesses receive the pivots of the eccentric lever. The recesses may be substantially semicircular or U-shaped for reasons of ease of assembly of the handle assembly and be pushed onto the pivot.

The handle assembly may further include a cap which secures the eccentric lever and the bearing block against rotation about the axis of movement relative to the handle. The eccentric lever and the bearing block can thus be fixed to the handle, but arranged co-rotating with the handle. In this case, it is advantageous if the handle is shaped such that the eccentric lever dips into its locked position in the handle, whereby accidental pivoting of the eccentric lever is prevented from the locking position to the release position. Alternatively, it is possible to execute the eccentric lever fixed to the machine tool housing or undefined on the machine tool housing.

The cap can also prevent mishandling of the secured with the lock screw adjusting screw.

When the eccentric lever is pivoted, the at least one cam contour slides along a movement path. In order to reduce the wear in the region of the contact surface between the at least one cam contour and the handle, the handle can be provided in this contact region with a thrust washer.

Further advantages will become apparent from the following description of the figures. In the figures, various embodiments of the present invention are shown. The figures, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations.

In the figures, identical and similar components are numbered with the same reference numerals. Show it:

Fig. 1A / B a known hand-held machine tool with adjustable handle;

FIG. 2 shows a handle arrangement on a machine tool according to the invention; FIG.

Fig. 3 shows the handle assembly of Figure 2 in an exploded view.

Fig. 4 shows the handle assembly of Figure 2 in a sectional view.

5 shows a handle in a perspective view;

6 shows a cam contour in a plan view;

7 shows an eccentric lever, a bearing block and a cap in the assembled

State in a perspective view; and

Fig. 8 shows the handle of FIG. 5 with inserted eccentric lever.

Embodiment:

Fig. 1A shows a known from the prior art hand-held machine tool in the form of a hand grinder SG. The known hand grinder SG comprises a housing G, at the rear end and in the vicinity of an on / off switch EAS a rear guide handle HG is arranged. The rear guide handle HG is rigidly executed with the hand grinder SG. The hand grinder SG further comprises a front handle VG, which has a bow-shaped shape. The front handle VG is laterally arranged on the hand grinder SG such that it can be pivoted about a pivot axis and, if necessary, detached from the hand grinder SG (FIG. 1B). In particular, the housing G comprises a counter-coupling means GKM, which cooperates with a coupling means KM on the handle VG. To adjust the position of the front handle VG a clamping screw SP is loosened, then pivoted the front handle VG in the desired position and finally tightened the clamping screw SP again to press the coupling means KM on the handle VG in the negative feedback means GKM on the housing G. The pivotable connection of the front handle VG on the hand grinder SG, the position of the front handle VG can be adapted to different environmental conditions, such as grinding or cutting on the surface, in corners, niches, etc.

A machine tool 2 according to the invention is indicated in FIG. 2 only. The machine tool 2 comprises a machine tool housing 4 and a relative to the machine tool housing 4 in its angular position adjustable handle assembly 6. The machine tool housing 4 may for example be a gear housing and at least in the region of the handle assembly 6 have a cylindrical shape. The handle assembly 6 includes a locking mechanism 8 and a handle 10. The handle 10 of the handle assembly 6 has a hollow truncated cone-shaped base 12 and an elongated L-shaped grip portion 14 which is integrally formed on the hollow frusto-conical base 12.

As can be seen in the exploded view of FIG. 3, the machine tool housing 4 comprises a hollow-cylindrical dome 16 with a core hole 18 which has an internal thread (FIG. 4). The dome 16 protrudes from the machine tool housing 4 and extends along a movement axis X.

From Fig. 3 it is further apparent that the hollow truncated cone-shaped base 12 of the handle 10 is formed by a jacket wall 20 and a top wall 22. In the assembled state of the handle assembly 6, the back of the top wall 22 of the handle 10 is the Machine tool housing 4 facing. The top wall 22 has an opening 24 for the dome 16 (FIG. 4).

The machine tool housing 4 in the mounted state facing the back of the top wall 22 has a handle-side coupling means 26. As shown in Fig. 5, the handle-side coupling means 26 is designed as concentric with the opening 24 annularly around the opening 24 circumferential flat teeth. Radially between the opening 24 and the coupling means 26, a handle-side planar ring portion 28 is provided on the top wall 22, which is recessed relative to the coupling means 26.

Concentric to the dome 16 and to the movement axis X, a housing-side counter-coupling means 30 is provided, which is configured as a counter-toothing arrangement running around the dome 16 in an annular manner (FIG. 3). Radially between the dome 16 and the counter-coupling means 30, a housing-side planar annular portion 32 is arranged, which is recessed relative to the counter-coupling means 30.

The locking mechanism 8 makes it possible to move the handle 10 between a state coupled to the machine tool housing 4 and a state decoupled with the machine tool housing 4.

Are the handle 10 and the machine tool housing 4 in the coupled state, the negative feedback means 30 of the machine tool housing 4 and the coupling means 26 of the handle 10 are engaged. The handle 10 is then fixedly connected to the machine tool housing 4 and can not move relative to the machine tool housing 4.

Are the handle 10 and the machine tool housing 4 in the decoupled state, the negative feedback means 30 of the machine tool housing 4 and the coupling means 26 of the handle 10 are disengaged. As a result, a relative movement between the handle 10 and the machine tool housing 4 is possible. In particular, the angular position of the handle 10 can be adjusted relative to the machine tool housing 4 by the handle 10 is rotated about the movement axis X. To set the set angular position, the coupled state between the handle assembly 6 and the machine tool housing 4 is restored by means of the locking mechanism 8. The locking mechanism 8 will be described in more detail below.

The locking mechanism 8 has in the illustrated embodiment, a spring element 34, an eccentric lever 36, a bearing block 38 for the eccentric 36, a hollow cylindrical adjusting screw 40 with an external thread (for example, with Thread size M16) and an internal thread (for example, with thread size M8), a countersunk screw 42 with an external thread on and a cap 43 on.

In Fig. 3 it can be seen that the spring element 34 is disposed between the machine tool housing 4 and the handle 10. More specifically, the annular recesses 28, 32 of the top wall 22 and the machine tool housing 4 in the assembled state of the handle assembly 6 form an annular channel (Fig. 4), in which the spring element 34 is arranged in the form of a rectangular spring. The spring element 34 thus extends concentrically to the dome 16 and the opening 24th

As can also be seen in Fig. 3, the eccentric lever 36 has a first end 44 and a second end 46. At its first end 44, the eccentric lever 36 has an elongated eccentric handle 48, from which two fork-shaped, mutually parallel legs 50 in Direction of the second end 46 of the eccentric lever 36 extend. In the assembled state of the handle assembly 6 are the legs 50 with their outsides on the inside of the lateral surface 12 of the handle 10 to prevent rotation of the eccentric lever 36 about the movement axis X relative to the handle 10 (Fig. 2).

The eccentric lever 36 is pivotable between a locking position shown in Fig. 2 and a release position. As can be seen in FIGS. 2 and 3, the handle 10 in the exemplary embodiment shown is shaped such that the eccentric lever 36 dips into the L-shaped grip section 14 in its locking position.

The legs 50 each have at the second end 46 an outwardly curved contour 52, which is substantially semicircular in the illustrated embodiment. The center 54 of the semicircular contour 52 is shown in FIG. In addition, a circular pivot pin 56 is in each case arranged on the opposite inner surfaces of the legs 50. The center 58 of the pivot 56 is also indicated in Fig. 6. The circle center 58 of each circular pivot 56 has a distance D from the center of the circle 54 of the corresponding curved contour 52 which is greater than zero. In this way, each semicircular contour 52 forms a cam contour with respect to the circle center 58 of the corresponding pivot 56. In other words, the axis defined by the centers 54 is eccentric to the axis defined by the centers 58, which forms the pivot axis S for the eccentric lever 36.

As can be seen in FIG. 8, the legs 50 abut with their curved contours 52 in the mounted state on the front side of the top wall 22 of the handle 10. Thereby also the pivot axis S of the eccentric lever 36 is defined, which extends through the centers 58 of the pivot pin 56 of the two legs 50. For reasons of clarity, only the handle 10 and the eccentric lever 36 are shown in its locking position in FIG. 8.

The bearing block 38 of the locking mechanism 8 has an annular base 60 with an opening 62 for the adjusting screw 40 and two opposing support members 64 which extend substantially perpendicularly away from the back of the base 60. At the base 60 of the distal end of the support members 64, a semicircular or U-shaped recess 66 is provided in each case. In the assembled state, the pivot pins 56 of the legs 50 are received in the recesses 66 of the support elements 64. In this case, the support elements 64 to the top wall 22 and lie against the inner sides of the legs 50 at.

Instead of recesses 66, bores for the pivot pins 56 may alternatively be provided in the support elements 64.

The hollow cylindrical adjusting screw 40 of the locking mechanism 8 has an elongated body portion 68 and a head portion 70 through which a bore 72 extends. Between the body portion 68 and the head portion 70, an annular circumferential shoulder 74 is formed, on which the base 60 of the bearing block 38 rests in the mounted state of the handle assembly 6. The body portion 68 of the adjusting screw 40 has an external thread and an internal thread. In the mounted state of the handle assembly 6, the adjusting screw 40 is screwed with its external thread in the internal thread of the dome 16. Specifically, the adjusting screw 40 extends in the assembled state of the handle assembly 6 through the opening 62 in the base 60 of the bearing block 38, the opening 24 in the top wall 22 of the handle 10, the spring element 34 and finally through the dome 16 of the machine tool housing 4th

When mounting the handle assembly 6 to the machine tool housing 4, the spring element 34, the handle 10, the eccentric lever 36 and the bearing block 38 is sequentially threaded onto the dome 16 of the machine tool housing 4 and bolted to the hollow cylindrical adjusting screw 40. To secure the axial position of the adjusting screw 40 relative to the machine tool housing 4, the lock screw 42 is screwed into the bore 72 of the adjusting screw 40. The lock screw 42 may be, for example, a hexagon socket screw. As can be seen in FIG. 4, the end of the counter screw 42 immersed in the bore 72 is supported against a shoulder 78 formed by the core hole 18 of the dome 16 in order to clamp the adjusting screw 40 firmly in the dome 16. In this way, between the shoulder 74 of the adjusting screw 40, which serves as a stop for the bearing block 38, and the counter-coupling means 30 of the machine tool housing 4, a defined distance can be adjusted. This in turn also defines a predetermined distance between the pivot axis S of the eccentric lever 48 and the counter-coupling means 30 of the machine tool housing 4.

In the illustrated embodiment, the handle assembly 6 also includes the cap 43. From Fig. 7 it can be seen that the cap 43 has a substantially rectangular base wall 82, extending from the back substantially perpendicular to the base wall 82 four walls in the direction of the machine tool housing 4. More specifically, extending from the base wall 82 are two substantially parallel side walls 84, a bottom wall 86 substantially perpendicular to the bottom wall 86, and a bottom wall 86 substantially parallel to the arm 88. The side walls 84 are at their bottom wall 86 nearer end each with a recess 90 provided. The arm 88 has on its side facing the bottom wall 86 a locking device 92 in the form of a wedge-shaped projection.

In the mounted state of the handle assembly 6, the cap 43 is received between the legs 50 of the eccentric lever 36, wherein the legs 50 of the eccentric lever 36 abut with their inner surfaces on the side walls 84 of the cap 43. Thus, the outer sides of the side walls 84 of the cap 43 serve to guide the legs 50 of the eccentric lever 36 in its pivoting movement from the locking position to the release position and vice versa. In addition, the cap 43 is supported with the bottom wall 86 on the lateral surface 12 of the handle 10 from. This arrangement ensures that the cap 43 can not rotate about the movement axis X relative to the handle 10. Against an axial displacement along the axis of movement X of the machine tool housing 4 away the cap 43 is secured in the mounted state of the handle assembly 6 in that the eccentric 48 overlaps in the radial direction with the upper end of the base wall 82 of the cap 43 and in the axial direction in front of the upper End of the base wall 82 is arranged (Fig. 2).

The bearing block 38 is disposed between the arm 88 and the bottom wall 86. The latching device 92 of the arm 88 engages behind the base 60 of the bearing block 38 and the two support elements 64 of the bearing block 38 are received in the recesses 90 of the cap 43. This is shown in FIG. 7. In this way, the bearing block 38 is secured relative to the cap 43 and thus also to the handle 10 both against rotation about the movement axis X and against an axial displacement along the movement axis X.

The operation of the handle assembly 6 is as follows: In the coupled state, the counter-coupling means 30 of the machine tool housing 4 with the coupling means 26 of the handle 10 against the action of the spring element 34 is engaged. The counterforce to the spring force is applied by the other components of the locking mechanism 8. For this purpose, the distance between adjusting screw 40 and the machine tool housing 4 or its counter-coupling means 30 is set such that in the locking position of the eccentric lever 36 shown in Fig. 2, the cam contours 52 of the legs 50 press with a predefined pressure force against the top wall 22. As a result, the pivot pin 56 of the legs 50 against the bearing block 38 and this pressed against the shoulder 74 of the adjusting screw 40. Due to the anchoring of the adjusting screw 40 in the dome 16 of the machine tool housing 4, however, the adjusting screw 40 can exert the corresponding counterforce on the bearing block 38. Since the handle assembly 6 is in the coupled state in equilibrium, ie no movement is performed, thus caused by the eccentric lever 36 compressive force of the spring element 34 caused by the spring force must be kept in balance. Both the pressure force caused by the eccentric lever 36 and the spring force caused by the spring element 34 act on the top wall 22 of the handle 10, but in opposite directions and can thus compensate.

If the eccentric lever 36 is brought from the locking position to the release position by the eccentric lever 36 is pivoted away in the direction of the handle 10 about the pivot axis S, the curved contours 52 of the two legs 50 slide on the top wall 22. In particular, reduces the distance between the Pivot axis S of the eccentric lever 36 and the points of contact of the curved contours 52 on the top wall 22. In this way, the pressure exerted by the eccentric lever 36 on the top wall 22 of the handle 10 compressive force decreases, so that the spring element 34 can relax. By relaxing the spring element 34, the handle 10 is pushed away from the machine tool housing 4, whereby the counter-coupling means 30 of the machine tool housing 4 is disengaged from the coupling means 26 of the handle 10. LIST OF REFERENCE NUMBERS

2 machine tools

4 machine tool housing

6 handle assembly

8 locking mechanism

10 handle

12 Hollow frustum-shaped base

14 L-shaped handle section

16 dome

X movement axis

18 core hole

20 jacket wall

22 ceiling wall

24 opening

26 Handle-side coupling agent

28 Handle-side ring area

30 Housing negative feedback device

32 Housing-side ring area

34 spring element

36 eccentric lever

5 pivot axis

38 bearing block

40 Hollow cylindrical adjusting screw

42 counter screw

43 cap

44 First end of the eccentric lever

46 Second end of the eccentric lever

48 eccentric handle

50 legs of the eccentric lever

52 Curved contour of a thigh

54 Center point of the curved contour of a leg

56 pivot

58 Center of a pivot

D Distance between centers 54 and 58 60 Annular bearing base Opening in the base of the bearing block

Support elements of the bearing block

Semicircular recess in the support elements of the bearing block

Elongated body portion of the adjusting screw

Head section of the adjusting screw

Bore the adjusting screw

Shoulder of the adjusting screw

Paragraph in the core hole of the cathedral

Base wall of the cap

Side walls of the cap

Bottom wall of the cap

Arm of the cap

recess

locking device

Claims

claims

Machine tool (2), in particular hand-held machine tool, with a machine tool housing (4) and one opposite the machine tool housing

(4) in its angular position adjustable handle assembly (6), wherein the handle assembly (6) contains:

at least one handle (10) having at least one coupling means (26) which is adjustable relative to at least one counter-coupling means (30) of the machine tool housing (4) in its angular position and linearly movable along a movement axis (X), and

a lock mechanism (8) adapted to fix the handle (10) in a coupled state in which the coupling means (26) of the handle (10) is engaged with the counter coupling means (30) of the machine tool housing (4) in that the handle (10) and the machine tool housing (4) are fixedly connected to one another and release in a decoupled state, in which the coupling means (26) of the handle (10) is disengaged from the counter-coupling means (30) of the machine tool housing (4) in that the handle (10) is adjustable relative to the machine tool housing (4) in its angular position,

characterized in that the locking mechanism (8) includes:

an eccentric lever (36) having a first end (44) and a second end (46) disposed about a pivot axis (S) perpendicular to the axis of movement (X) and provided in the region of the second end (46) between a locking position and a release position is reversibly pivotable,

at least one bearing element (38) for pivotably supporting and holding the eccentric lever (36), and

a stop (74) for the eccentric lever (36) for defining a predetermined distance between the pivot axis (S) and the counter-coupling means (30) of the machine tool housing (4),

wherein at the second end (46) of the eccentric lever (36) at least one cam contour (52) is provided, whose center (54) outside the pivot axis

(5), so that the handle (10) is transferred by pivoting the eccentric lever (36) in the locked position in the coupled state and released by pivoting the eccentric lever (36) in the release position in the decoupled state. Machine tool (2) according to claim 1,

characterized in that the locking mechanism (8) further includes a spring element (34) disposed between the machine tool housing (4) and the handle (10), which transfers the handle (10) from the coupled state to the decoupled state.

Machine tool (2) according to claim 1 or 2,

characterized in that the position of the stop (74) for the eccentric lever (36) along the movement axis (X) is adjustable.

Machine tool (2) according to one of the preceding claims,

characterized in that the machine tool housing (4) has a along the movement axis (X) extending dome (16) for attaching the handle assembly (6).

Machine tool (2) according to claim 4,

characterized in that the dome (16) is hollow cylindrical and has an internal thread, and that the stop (74) for the eccentric lever (36) on an adjusting screw (40) is provided with an external thread which in the internal thread of the hollow cylindrical dome (16 ) is screwed.

Machine tool (2) according to claim 5,

characterized in that the adjusting screw (40) is hollow cylindrical and has an internal thread, wherein for axially securing the adjusting screw (40) has a counter-screw (42) is screwed with an external thread in the adjusting screw (40).

Machine tool (2) according to one of the preceding claims,

characterized in that the eccentric lever (36) has two legs (50) which at the second end (46) of the eccentric lever (36) each provide a cam contour (52) and a pivot (56), wherein the pivot (56) the Define the pivot axis (S) of the eccentric lever (36).

Machine tool (2) according to one of the preceding claims, characterized in that the at least one bearing element is a bearing block (38) which is arranged between the legs (50) of the eccentric lever (36).

Machine tool (2) according to claim 8,

characterized in that the bearing block (38) has two support elements (64) each having a recess (66), wherein the recesses (66) receive the pivot (56) of the eccentric lever (36).

0. Machine tool (2) according to claim 9 or 10,

characterized in that the handle assembly (6) further includes a cap (43) which secures the eccentric lever (36) and the bearing block (38) against rotation about the axis of movement (X) relative to the handle (10).