JPS61192405A - Tool holer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is a tool holder for connecting percussion and/or rotary tools with a hand-held machine tool, which transmits five drive movements of the hand-held machine tool. A coupling sleeve is provided which is in driving connection with the drive member and which receives the tool shank, the tool shank having at least one closed groove-shaped recess on both ends when viewed in the axial direction. a substantially axially extending elongate locking body having a radially movable hold in a longitudinal slot of the coupling sleeve engages in the corresponding groove-like cutout, the coupling sleeve Together with the locking body, it is surrounded by a spring-loaded shift sleeve, and within the shift sleeve there are opposed opposing surfaces of the locking body for locking and unlocking the locking body. Relating to a type in which an inner working surface is provided which acts against the locking surface.

BACKGROUND OF THE INVENTION Although tool holders of the type described above are known, they suffer from various drawbacks. For example, if the depth of the groove formed in the tool shank does not match the dimensions of the tool holder, the inserted tool/year/ring may be automatically engaged. It is difficult to stop. In addition, only tools whose arrangement type and number of groove-like notches provided on the tool/yank match the arrangement type and number of locking bodies in the tool holder can be inserted and mounted. For example, if a tool holder has four locking bodies arranged in sequence with approximately equal circumferential angular spacing, in order to be able to lock such a tool in the tool holder, The tool shank must also have four groove-shaped recesses with a circumferential angular pitch corresponding to the locking body. Due to the limited axial length of the stop in known tool holders, wear in the area of the tool shank is relatively high.

Problems that the invention seeks to solve The object of the invention is to provide a method for automatically adapting a locking body to the respective depth of a groove-shaped recess in a tool shank, and for providing a locking body arranged in a tool holder. Tools in which the number of groove-like notches on the tool shank are fewer than the number of locking bodies can be satisfactorily locked, and the wear of the tool shank can be reduced, resulting in reductions in tool costs. The purpose is to provide a tool holder.

Means for Solving the Problem The means of the invention for solving the problem described above is characterized in that the inner working surface has a first control surface extending parallel to the axis of the tool shank and acting in the radial direction. , at least a second control surface stepped at a greater radial distance from the axis relative to the first control surface; act in the radial direction,
a first locking surface and a correspondingly arranged second locking surface also extending substantially parallel to the axis and acting in the radial direction on the second control surface; a surface is stepped with respect to said first locking surface and is provided at a greater radial spacing from said axis than with said first locking surface, each locking body at least partially comprising: having an axial dimension shorter than the longitudinal slot of the coupling sleeve in which the locking body is received and arranged to be axially and radially shiftable from a locked position to an unlocked position within the longitudinal slot; Moreover, in the locking position, the first locking surface is radially supported by the first control surface, and the second locking surface is supported by the second control surface in the radial direction, and the locking is released. In this position, the first locking surface is radially supported on the second control surface and the groove-like cutout of the tool shank is released.

Advantageous embodiments of the invention are described in the dependent claims.

Example Next, four embodiments of the present invention will be explained in detail with reference to the drawings.

1 to 7, an electric motor (not shown) includes a driving member 2 which protrudes forward from its fixed casing 1 and which produces a rotary drive, as well as an axially impacting Only the axially arranged drive member 3 is shown.

A removable tool holder 5 is fixedly attached to the casing 1. The tool holder 5 has a coupling sleeve 6 with a mounting flange 4 at its right end as seen in FIG. 1, said mounting flange being fixed to the drive member 2 by a plurality of screws. . The coupling sleeve 6 is made of steel, for example. An axially slidable shift sleeve 7 made of metal or plastic is guided along the outer surface of the coupling sleeve 6. The coupling sleeve 6 has a continuous cylindrical receiving hole 8 in its interior, into which a tool (for example)
The tool shank 9 is inserted. The tool shank 9 has two flat stone faces with a conical edge at its rear end,
The strut ξ surface abuts the stopper surface facing the drive member 30 in the axial direction. Axial impact is transmitted via the two stone surfaces and the opposing stopper surface.

In this embodiment, a total of four groove-shaped notches 10 are provided on the outer peripheral surface of the tool shank 9 at equal circumferential angular intervals and are closed on both sides in the axial direction. One elongated locking body 11, which is substantially parallel to the axis, is engaged with each of the two. Each locking body 11 is held movable in the radial direction within a longitudinal slot 12 of the coupling sleeve 6.
・Ru. The longitudinal slots 12 taper radially inwardly to prevent the locking bodies 11 from falling inwardly. In the first embodiment, the locking body 11 is axially slidable in the longitudinal slot 12 and radially movable. This movement shifts the shift sleeve 7 from the locked position shown in FIG. 1 to the unlocked position shown in FIG.
This is also caused by a relative movement of the tool shank 9, with the inner actuating surface for locking and unlocking each locking body 11 acting against the opposing locking surface.

Each locking body 11 has a cylindrical roller 13 disposed in a longitudinal slot 12 and a force/ζ
- a sliding block 14, which supports the cylindrical roller 13 in the axial direction by means of a stone ξ protrusion 15 at its right end as seen in FIGS. 1, 6 and 7. The cylindrical roller 13 engages within the notch 10 in the locking position. The sliding block 14 has a first locking surface 16 and a second locking surface 17 that continues in a stepped manner from the first locking surface on its arcuate outer peripheral surface. The first and second locking surfaces 16 and 17 extend substantially parallel to the axis, and the second locking surface 17 is stepped with respect to the first locking surface 16 and extends from the center of the tool shank axis. It is arranged at a greater radial distance than the first locking surface 16 . 1st
In the exemplary embodiment, the strut ξ projections 15 are provided at the right end of the slide block 14, as viewed in FIG. It stands out.

The coupling sleeve 6 is configured as a stepped section in the middle region in which the longitudinal slot 12 is provided. A control ring 18 is mounted on the outer periphery of this stepped section, which is secured immovably in both axial directions. The control ring encloses a coupling sleeve 6 and has a ring inner circumferential surface of a small diameter at its left end as viewed in FIG. 1, and the ring inner circumferential surface forms a first control surface 1g. There is.

The control ring 18 is provided with a large-diameter ring inner circumferential surface extending from the first control surface 19 toward the right in the axial direction via a stage transition slope 20, and the large-diameter ring inner circumferential surface is provided with a second control surface. A surface 21 is formed.

Note that another stepped control surface is provided between the first control surface 19 and the second control surface 21, and the first control surface of the sliding block 14 is
Of course, it is also possible to provide a locking surface corresponding to the stepped control surface between the locking surface 16 and the second locking surface 17.

The control ring 18 is mounted non-axially shiftably on the outer periphery of the coupling sleeve 6, so that the upper first control surface 9 and the second control surface 21 are fixed components of the coupling sleeve 6, as described above. The two front faces 16.17 of the sliding block 14 are shifted relative to the two control surfaces 19.21.

The coupling sleeve 60 has a stepped section with a first large diameter portion 22
and the outer diameter of the first large diameter portion is at least substantially
Forming the first control surface 19 of the control ring 18, it is equal to the diameter of the inner peripheral surface of the ring.
A second large diameter portion 23 is provided, the outer diameter of which is smaller (and substantially equal to the diameter of the ring inner circumferential surface forming the second control surface 21 of the control ring 18). Equal. 1st
A truncated conical surface 24 (FIG. 2) is formed at the transition portion from the large diameter portion 22 to the second large diameter portion 23. control ring 1
8 with its first control surface 19 on the first large diameter portion 22;
The second control ring 21 also overlies the second large diameter portion 23, and the step transition slope 20 of the control ring 18 abuts the frustoconical surface 24, so that the control ring 18 It is supported so that it cannot be shifted in the axial direction to the right as seen in the figure. A retaining ring 25 rests on the left end face of the control ring 18 and is movable in the axial direction along the first large diameter section 22 of the coupling sleeve 6 . The retaining ring 25 is resiliently supported in the axial direction via a buffer ring 26 (in particular a rubber ring). The buffer ring 26 is axially supported on a support ring 27, which is held non-shiftably in the coupling sleeve 6 by a snap ring 28.

In this way, the control ring 18 is also axially fixed on the left hand as viewed in FIG.

The intermediate region of the coupling sleeve 6 with the stepped first and second large diameter portions 22,23 has a number of longitudinal slots 12 corresponding to the number of locking bodies 11; The longitudinal slot extends radially through and in the forward first large diameter section 22 into a longitudinal cutout 29 which is only radially outwardly open, as shown in particular in FIG. It is transitioning. That is, the longitudinal notch 29 does not reach the receiving hole 8 in the radial direction.

Each locking body 1 consists of a cylindrical roller 13 and a sliding block 14
The axial dimension of 1 is shorter than the longitudinal slot 12 in which the locking body is housed, so that each locking body 11
2, it is possible to reciprocate in the axial direction. In the locking position shown in FIG. 1, the cylindrical roller 13 fits into the groove-shaped cutout 10 of the tool shank 9 and is locked in such a way that it is secured in the axial direction and transmits torque. The sliding block 14 as well as the cylindrical roller 13 are also in the locked position. In this locking position, the first locking surface 16 of the sliding block 14 rests radially against the first control surface 19, so that this bearing already causes the sliding block 14 and thus the cylindrical rollers 13 to move radially outward. It is not possible to release the tool shank 9 by doing so. The second locking surface 17 of the sliding block 14 also rests radially against a second control surface 18 of the control ring 18 .

In contrast, in the unlocked position shown for example in FIG. 6 or 7, the first locking surface 16 of the sliding block 14 rests radially against the second control surface 21 of the control ring 18. . In short, the sliding block 14 is shifted axially to the right and at the same time is shifted radially outward by the step difference between the first control surface 19 and the second control surface 21, so that the cylindrical roller 13 can be removed from the groove-like cutout 10. The follower tool shank 9 is now in a released state.

In the illustrated control ring 18, an intermediate surface is additionally provided between the first control surface 19 and the second control surface 21, which is stepped to both control surfaces.

This intermediate surface also serves the same control purpose.

As can be seen from the above, in Figure 1, from left to right,
The control surface 19 has a second control surface 21 and a first locking surface 16 .
A second locking surface 17 follows. The steps required are:
In FIG. 1, the diameter increases from left to right. Not only the cylindrical rollers 13 but also the sliding block 14 are received in the longitudinal slot 12, so that the sliding block 14 is secured in the circumferential direction.

The coupling sleeve 6 is mounted at the right end near the flange as seen in FIG. A spring 32 (in particular a cylindrical coil spring) substantially parallel to the axis is provided in the slot 31, one for each slide block 14, the left end of which is connected to the end of the slide block 14 closer to the stopper projection 15. is assigned to. In this way, each locking body 11 and, moreover, its sliding block 14 is loaded with an axial spring force, the direction of which is opposite to the insertion direction of the tool shank 9.

The shift sleeve 7 is fixed in position on the coupling sleeve 6 in one axial direction by a snap ring 33. The shift sleeve 7 can be shifted in a direction opposite to the above-mentioned axial direction.

The shift sleeve has a plurality of finger-shaped stop horns ξ34 (see FIG. 3) extending in the axial direction connected to the left end in FIG. is oriented toward each locking body 11 at °C.
・Ru. The stone ξ 34 may be integrally molded with the shift sleeve 7 or, as in the illustrated example, may be a part of the ring 35 that abuts against and is loaded by the front end of the shift sleeve 7. good.

Each finger-shaped stopper 34 is connected to the coupling sleeve 6
It axially passes through the vertical notch 29 of the slide block 14 to reach each slide block 14, and the stop horn groove 34 is in contact with the left end surface of the slide block at the locking position. Therefore, if the shift sleeve 7 is shifted toward the right as seen in FIG. The first locking surface 16 finally reaches the height of the second control surface 21 and is supported in the radial direction by the second control surface 21. Each sliding block 14 has a first
At the left end in the figure, each stone ξ 34 has a beveled end face 36 radially outward of the working surface, the angle of inclination being equal to the angle of the step transition ramp 20 of the control ring 18 . When the sliding block 14 reaches the unlocked position (FIG. 6), the sliding block 14, with its diagonal end face 36, engages the control ring 180.
It is supported in the axial direction by the stage transition slope 20 and is secured in this unlocked position (FIG. 6).

An axial stone/ξ spring 37 is provided at the front end (on the left in FIG. 1) of each cylindrical roller 13, and the axial stone/xi spring is supported by the coupling sleeve 6. It is essentially non-shiftable in the axial direction and extends radially into the longitudinal slot 12 to at least the height of the cylindrical rollers 13 . The axial spring ξ spring 37 consists of a ring spring section formed by bending a wire rod, which extends over a circumferential angle of about 900 degrees, and has a substantially ■-shaped section (FIG. 3) that connects the longitudinal slot 12. and supports the left end surface of the cylindrical roller 13 by engaging inside. The remainder of the ring spring section is received and supported within the circumferential groove 38 of the retaining ring 250. In this way, the axial stop ξ spring 37 is elastically supported and damped via the damping ring 26, so that the locking and unlocking movements of the tool shank 9 are damped as a whole.

In order to release the locked tool shank 9 in FIG. 1, the shift sleeve 7 is manually shifted toward the right as seen in FIG. - via ξ 34 the Φ sliding blocks 14 are shifted to the right against the action of the respective spring 32; In this case, the sliding block 14 is moved along a first control surface 19 with a first locking surface 16 and along a second control surface 21 with a second locking surface 17 at a step, e.g. reach, slide until. Upon reaching the step transition slope 20, each slide block 14 undergoes a radial movement corresponding to a step until said first locking surface 16 now abuts the second control surface 21 in the radial direction. I do. As a result, the cylindrical rollers 13 escape radially outward and separate from the groove-shaped cutout 10 of the tool shank 9. The tool is then released and can be completely removed. The shift of the cylindrical roller 13 to the left accompanying this removal is elastically restricted by the axial stone ξ spring 37. Each sliding block 14 is axially supported with a diagonal end face 36 on a step transition ramp 20 at least while the tool shank 9 is still located within the cylindrical roller 13. The tool shank 9 reaches outside the range of the cylindrical roller 13 and the cylindrical roller 13
can now penetrate radially inwardly into the receiving hole 8, and under the relaxing action of the spring 32 the sliding block 14 is again shifted from right to left into the starting position, with the first
Slope 3 at the transition between the locking surface 16 and the second locking surface 17
One aids the radial return of the wobbling block 14 from the position shown in FIGS. 6 and 7 to the position shown in FIG. (unless it is already in contact with) Stone ξ protrusion 15
comes into contact with the right end of the cylindrical roller 13.

When inserting the tool/yank 19, the cylindrical roller 13 is lifted toward the right hand via the conical edge provided on the right end surface of the tool shank 9. The cylindrical roller 13 comes into contact with the stopper protrusion 15, whereby the resting block 14 is also shifted toward the right hand against the action of the spring 32. During this shifting movement, the shifting block 14 is shifted via the stepped curved surface of the control ring 180, as required via the first control surface 19 and the second control surface 21. When the first locking surface 16 of each sliding block 14 reaches the second control surface 21, the cylindrical rollers 13 and the resting blocks 14 escape radially outward and create a path for the complete insertion of the tool shank 9. Release. The tool shank 9 can now be pushed along the cylindrical roller 13, which then penetrates into the groove-like recess 1o of the tool shank 9. This is done as follows. That is, the sliding block 14 is relaxed, and the control ring 1 is released via the spring 32.
The cylindrical roller 13 is shifted to the left by taking advantage of the stepped curved surface of 8.
It reaches the locking position shown in FIG. 1, where it is locked so that it cannot escape in the radial direction. This places the tool shank 9 in a locked state.

Effects of the first embodiment The intermediate step between the first control surface 19 and the second control surface 21 is utilized depending on the circumstances of the tool. In other words, depending on the depth of the groove-like notch 10 of the tool shank 9, the resting block 14 is
It remains either on the control surface 19 or on an intermediate control surface with a slightly larger diameter.

In other words, the locking position of the cylindrical roller 13 is determined by the depth of the groove-shaped notch 10 of the tool shank 9 in each case. It is therefore possible to adapt satisfactorily to grooves 10 of different depths in the tool shank 9, and also to grooves 10 which are more or less worn depending on the frequency of use.

Instead of having Φ groove-like cutouts 10 as shown, two
If a tool shank 9 with only one groove cutout is used, when the tool shank 9 is locked the remaining two cylindrical rollers 13 remain in the disengaged position shown in FIG. Contact with the circular outer surface.

By stepping the inner circumferential surface of the control ring 18 and the outer circumferential surface of each sliding block 14 in the form of a stepped curve, the shifting distance of the shifting sleeve 7 is substantially equal to the length of the individual locking body 11. becomes irrelevant. Also, despite the automatic tool locking, the length of the longitudinal slot 12 in the coupling sleeve 6 is actually only slightly longer than the length of the locking body 11. The locking body 11 automatically adapts to the depth of each groove-like cutout 10 in the tool shack 9. In this way, even tools whose tool shank 9 has fewer groove-shaped cutouts 10 than the number of locking bodies 11 provided in the tool holder 5 can be satisfactorily locked. A further advantage is that it is still possible to use tools whose groove-shaped recesses in the tool shank 9 have already been considerably worn due to work with other hand-held power tools. This possibility of use is achieved in that the catch 11 automatically adapts to the respective depth of the groove-like recess 10.

Another advantage is that a locking body 11 of virtually any length is possible, so that wear on the tool shank 9 is also kept as low as possible, and thus for the plug-in end of the tool shank 9. This is advantageous because it is possible to select materials that are affordable in terms of cost, and the cost of tools can be reduced accordingly. Furthermore, since pure one-touch operation and automatic locking are guaranteed when inserting the tool shank, this also has industrial value.

The second embodiment shown in FIG. 8 differs from the first embodiment in that the individual locking bodies 111 are constructed as an integral elongated bending strip 140. is at a point where it engages in the groove-like notch 110 of the tool shank 109 with the strip portion located closer to the radial direction, similar to the cylindrical roller 13 of the first embodiment. Clear strip 14
0 has a first locking surface 1 on its outer peripheral surface.
16, and a second locking surface 117 that continues from this with a step. Due to the integration as the waving strip l40, in the first embodiment, the need for relative shifting movement between the cylindrical roller 13 and the waving block 14 is eliminated by the locking body 11.
It disappears in 1. In the second embodiment, the spring 132 acts on the right end of the resting strip 140.

Effects of the second embodiment The advantage of the second embodiment shown in FIG. 8 is that the structure of the locking body 111 is simpler.

In the third embodiment shown in FIGS. 9 and 10, the locking body 21
1 consists of two parts as in the first embodiment.

The locking body 211 consists of a cylindrical roller 213 and an associated block 214, which has a first locking surface 216 and a second locking surface 217. However, unlike the first embodiment, the strut protrusion 215 is provided at the front end (left hand in FIG. 9) of the drop block 214. In contrast to the first embodiment, the longitudinal slot 212 of the coupling sleeve 206 is not longer than the cylindrical roller 213. The cylindrical rollers are at least substantially axially non-shiftable within the longitudinal slots 212. The left end of the longitudinal slot 212 is followed by a narrower longitudinal notch 241 in which the stone protrusion 215 engages.
. The width of the longitudinal cutout 241 is at least approximately equal to the width of the stone protrusion 215 . The length of the longitudinal notch 241 is less than (or equal to) the axial shift distance through which the resting block 214 shifts from the locking position to the unlocking position. Notch 2
41 and, in the locking position shown, enters into the receiving hole 208 of the coupling sleeve 206 and forms a shaft ξ for the end of the uninstalled tool shank 209.

When the tool shank 209 is installed, the stone S protrusion 2
15 engages within the groove-like cutout 210 of the tool shank 209. In comparison with the first embodiment, the axial straight horn ξ spring 3
7 and the buffer ring 26 are lacking.

Instead, the left end of control ring 218 is attached to snap ring 2.
28 directly on the coupling sleeve 206 in the axial direction. In the same manner as in the first and second embodiments, the control ring 218 has on its inner circumferential surface a first control surface 219 and a second control surface 221 and, as can be clearly seen from the drawings, a first and a second control surface. There is an intermediate control surface 24 between the control surfaces.
It has 2.

In the third embodiment, when inserting the tool shank 209, only the slipping block 214 is shifted axially by the invading tool shank 209.

During insertion, the conical edge of the end of the tool shank 209 abuts the left end of the stone S projection 215 that enters the receiving hole 208. When the tool shank 209 is further pushed in, only the resting block 214 is shifted from the position shown in FIG. is now supported radially on the second control surface 221, thereby causing the tool shaft, ? The cylindrical rollers 213 can escape radially outward until the cylindrical rollers 209 are fully pushed in and the cylindrical rollers 213 reach into the groove-like cutouts 210 of the tool shank.

Effects of the Third Embodiment This configuration according to the third embodiment is also particularly simple, easy and inexpensive.

In the fourth embodiment shown in FIGS. 11 to 16, a special control block 343 is assigned to each locking body 311, which is constructed as a one-piece sliding strip 340, which control block A control block 343, which overlies the strip 340 in a substantially shoe-like manner on the outside and guides the strip with two side walls 344, 345, is axially shifted relative to the strip 340. Yes, but both cannot rotate relative to each other.

Each control block 343 is supported by a guide so that it can be shifted in the axial direction within a substantially axis-parallel recess provided in the inner circumferential surface of the guide ring 347, and is held unrotatable in the radial direction. Guy ring 347 is seated fixedly within shift sleeve 307.

The control block 343 is configured as shown in FIGS. 11, 15, and 16.
Both side walls at the end range of the left hand as seen in the figure, 11544.345
A second control surface 321 is provided in between, and the second control surface includes a first control surface 321.
1, the intermediate control surface 342 continues on the right hand side, and then the first control surface 319 continues on the intermediate control surface, and the radial distance of the first control surface from the axis is , is smaller than the second control surface 321 because it has a descending staircase shape.In short, in comparison with the first embodiment, the individual control surfaces 319, 342, 321 of the control block 343 are smaller than the second control surface 321. teeth,
The radial dimension does not increase from left to right as in the case of the first embodiment, but instead increases from right to left as seen in FIG. T-ru.

The first locking surface 316 of the sliding strip 340 is located to the right in FIG. 11 and is followed to the left by a second locking surface 317 of larger radial dimension.

Each control block 343 is axially shiftable against the return spring force of the spring 332 in the direction of insertion of the tool shank 309 towards the right-hand side as viewed in FIG. Spring 332 is integrally mounted within a pocket 348 at the rear end of control block 343. A latch 350 is fitted into a recessed portion 349 of the control block 343 that slopes downward toward the left as viewed in FIG. 11, and is rotatably supported at the right end. The locking lever 350 is bent at a substantially right angle at the left end to form a hook portion 351. All locking lenos 5-350 are held in the locking position via spring forces acting radially from the outside to the inside. The spring force is created by an O-ring 352 that surrounds all the locks A-350 together. At the locking position, the locking lever is 350
The hook portion 351 passes through a longitudinal slot 312 of the coupling sleeve 306 at an axially spaced distance forward of the forward end of the waning strip 340 and engages within the groove cutout 310 of the tool shank 309. ing.

The locking levers 350 have laterally projecting shoulders 353.3 on both sides radially spaced from the hook portion 351.
54, the layer can ride up on the frusto-conical surface 355 at the front of the coupling sleeve 306 and then move upwardly along the frusto-conical surface, thereby locking and - 350 is lifted radially outward and pivoted upward against the action of the spring force of O-ring 352, so that hook portion 351 releases tool shank 309;
.

In particular, as can be seen from FIGS. 13 and 16, the cleaning strip 34
0 has a corner cutout 356 at the front end for receiving a hook portion 351. An axial pressure spring 357 configured as a cylindrical coil spring is arranged between the front end of the shift sleeve 307 and each catch A-350, which pressure spring 357 influences the shifting movement of the soft sleeve 307. It is transmitted to the locking lever 350 and the locking is transmitted to the control block 343 via the locking lever 350.
keep it in that position.

The individual control blocks 343 are each actuated via a locking lever ζ-350. When the tool shank 309 is inserted, the free end of the tool shank abuts the hook portion 351. As a result, when the tool shank 309 is pushed in, the locking lever 350 and eventually the control block 343 are
1 from the left to the right against the action of the spring 332. At this time, when the second control surface 321 is shifted toward the right to the extent that the sliding strip 340 can escape in the radial direction and is disengaged from the second locking surface 317, this causes the sliding strip 340 to escape in the radial direction. 340 is released for radial movement and the sliding strip 340 is moved radially outward until the first locking surface 316 radially contacts the second control surface 321. At the same time, the locking leno ζ-35o is moved outwardly along the frustoconical surface 355 with the shoulder 353,354, so that the hook part 351 is moved into the receiving hole 30.
8 and freeing a path for pushing the tool shank 309.

When tool shank 309 is fully inserted, spring 332
Due to the relaxing effect of
40 is shifted towards the left hand as seen in Figure 11, so
The tool shank is locked. In this locking position, the individual locking lenses 350 are held by O-rings 352;
The removed debris 353 and 354 are removed from the coupling sleeve 306.
kept in contact with.

To unlock the tool shank 309, the shift sleeve 307 is shifted towards the right as viewed in FIG. As a result, the axial coupling simultaneously shifts the control block 343 and also the locking lever 350 via the pressure spring 357, finally releasing the tool shank 309 in the manner described above. leading to.

Effects of the fourth embodiment Also in the case of this fourth embodiment, if the tool shank 309 does not have one groove-shaped notch 310 but only has two groove-shaped notches, extra control is required. Since the block 343 and the locking bolts 350 remain in the unlatched, disengaged position, this embodiment also makes it possible to insert a tool shank 309 having, for example, only two or only one groove-like cutout.

The tool holder of the fourth embodiment has the advantage that the locking body 311 can be constructed with a significantly longer length in the form of a bending strip 340, which contributes to lower wear. Even if the sliding strip 340, when locked, in the working position closes the entire groove-shaped cutout 310 to the left hand side as viewed in FIG. 11, the hook portion 351 can rest on the tool shank 309. It's advantageous.

Although not shown, in the case of a simple variant with only two sliding strips, it is also possible to combine the control block 343 into one stepped ring.

Advantages of the Invention By stepping the interacting control surfaces and the locking surfaces of the locking body, the shifting distance of the shift sleeve is small (and essentially independent) of the length of the locking body. Furthermore, the length of the longitudinal slot in the tool holder is only slightly larger than the length of the locking body itself, even though automatic locking of the tool is obtained by a purely one-touch operation. In particular, the tool holder according to the invention makes it possible to automatically adapt the locking body to the respective depth of the groove-shaped recess provided in the tool shank. Even tools whose tool shank has only one groove-shaped notch, which is less than the number of locking bodies built into the holder, can be perfectly locked.For example, a tool holder with Φ locking bodies can be perfectly locked. Tools with only two groove-shaped cutouts in the tool shank are also successfully locked, even when the two locking bodies are located radially outward. remains in position and contacts the outer circumferential surface of the tool shank, while the other two locking bodies engage radially into the groove-like cutout of the tool shank to lock the tool shank in the axial direction and rotate at the same time. Due to the automatic adaptation to the different depths of the groove of the tool shank, even tools whose grooves are already quite significantly worn can still be used. A further advantage is that the material for the plug-in end of the tool can be selected at an affordable cost, which saves tooling costs, and locking bodies of virtually any length can be made. The industrial utility value of the present invention is therefore extremely high, since the wear on the tool shank is also reduced.

[Brief explanation of drawings]

FIG. 1 is a schematic vertical sectional view of a hammer drill according to a first embodiment of the present invention, showing the tool holder together with the driving member taken along line I-I in FIG. 3, and FIG. 2 is a schematic perspective view of only the coupling sleeve. Figure 3, Figure 3, and Figure 5 are schematic cross-sectional views taken along lines I-■, TV-TV, and v-v in Figure 1, respectively, and Figures 6 and 7 are schematic cross-sectional views of the tool. A schematic vertical cross-sectional view of the tool holder portion, which corresponds approximately to FIG. 1 when the tool is attached and when the lock is released, and FIGS. 8 and 9 approximately correspond to FIG. 1.
A schematic longitudinal sectional view of the tool holder portion according to the second and third embodiments, FIG. 10 is a schematic plan view of the coupling sleeve portion of the tool holder shown in FIG. 9, and FIG. 11 is approximately the same as that in FIG. FIGS. 12, 13 and 14 are schematic axial longitudinal cross-sectional views of the tool holder portion according to the fourth embodiment, corresponding to FIGS.
The figures are the ■-■ lines in Figure 11, respectively. Cross-sectional view along ■-■ line and ■-■ line, Figure 15 is
1 to 14, and FIG. 16 is a schematic exploded perspective view of the tool holder control block and associated locking bodies shown in FIGS. 11 to 14. It is a diagram. 1... Casing, 2... Drive member for rotational drive. 3... Drive member for axial impact, 4... Mounting 7 lange, 5... Tool holder, 6... Coupling sleeve, 7... Shift sleeve, 8... Receiving hole, 9
...Tool shank, 10...Groove notch, 11...
- Locking body, 12... Vertical slot, 13... Cylindrical roller, 14... Sliding block, 15... Stopper protrusion, 16... First locking surface, 17... Second Locking surface, 1
8... Control ring, 19... First control surface, 20...
・Step transition slope, 21...second control surface, 22...first
Large diameter part. 23...Second large diameter portion, 24...Truncated conical surface, 25
...Retaining ring, 26...Buffer ring, 27...
Support ring, 28... Snap ring, 29... Vertical notch, 30... Spring receiver, 31... Recess, 3
2...Spring, 33...Snap ring, 34...
Finger-shaped stopper, 35...ring, 36...
Diagonal end surface, 37... Axial stone/Zo spring, 38.
...Circumferential groove, 39...Slope, 106...Coupling sleeve, 109...Tool shank, 110...
-Groove-shaped notch, 111...locking body, 116...first
Locking surface, 117... Second locking surface, 132... Spring,
140... Sliding strip, 206... Coupling sleeve, 208... Receiving hole, 209... Tool shank, 210... Groove-shaped notch, 211... Locking body, 21
2... Vertical direction roller), 213... Cylindrical roller, 21
4... Sliding block, 215... Stopper protrusion, 2
16... first locking surface, 217... second locking surface, 21
8... Control ring, 219... First control surface, 221
...Second control surface, 228...Snap ring, 241
... Vertical notch, 242 ... Intermediate control surface, 306
... Coupling sleeve, 307 ... Shift sleeve, 308 ... Receiving hole, 309 ... Tool yank, 310 ... Groove-shaped notch, 311 ... Locking body, 31
2... Vertical slot, 316... First locking surface, 3
17... Second locking surface, 319... First control surface, 32
1... Second control surface, 332... Spring, 340...
Sliding strip, 342... Intermediate control surface, 343... Control block, 344.345... Side wall, 346... Recessed portion, 347... Guide ring, 348... Pocket, 349... ... Recessed part forming a downward slope, 350...
Locking lever.

Claims (1)

[Claims] 1. A tool holder for connecting a striking and/or rotary tool to a hand-held machine tool, the tool holder being drivingly connected to a drive member that transmits the drive motion of the hand-held machine tool. A coupling sleeve is provided for receiving a tool shank, said tool shank having at least one groove-shaped recess closed on both ends in the axial direction and extending into a longitudinal slot of said coupling sleeve. An elongated locking body extending approximately parallel to the axis is held movably in the radial direction at
Engaged in the corresponding groove-shaped recess, the coupling sleeve is surrounded together with the locking body by a spring-loaded shift sleeve, and inside the shift sleeve there is a In those types in which an inner working surface is provided which acts against the opposite locking surface of the locking body for locking and unlocking the locking body, the inner working surface is connected to the tool shank (9, a first control surface (109, 209, 309) extending parallel to the axis of the radially acting
9, 219, 319) and at least a second control surface (21, 221, 321) stepped at a larger radial distance from the axis relative to the first control surface; The first control surface (19, 219, 319) has a first control surface (19, 219, 319) extending substantially parallel to said axis and acting in the radial direction.
A locking surface (16, 116, 216, 316) is also provided on said second control surface (21, 221, 321), also a second locking surface (1) extending approximately parallel to the axis and acting in the radial direction.
7, 117, 217, 317) are arranged correspondingly, and the second locking surface is connected to the first locking surface (16, 116,
216, 316) and are provided at a larger radial distance from the axis than in the case of the first locking surface, and each locking body (11, 111, 211, 31
1) has an axial dimension at least partially shorter than the longitudinal slot (12, 212, 312) of the coupling sleeve (6, 106, 206, 306) receiving the locking body; The first locking surface (16, 116, 216, 316) is disposed within the longitudinal slot so as to be shiftable in the axial and radial directions from a locked position to an unlocked position; The first control surface (19, 219, 319) and the second locking surface (1
7, 117, 217, 317) is the second control surface (21
, 221, 321), and in the unlocked position, the first locking surface (16, 116, 21
6, 316) is the second control surface (21, 221, 321)
) is supported radially on said tool shank (9, 10
9, 209, 309) groove-like notches (10, 110, 2
10, 310) is open. 2. When viewed in the insertion direction of the tool shank (9, 109, 209, 309), the second control surface (21, 221, 321) is connected to the first control surface (19, 219, 319), and the second locking surface The surface (17, 117, 217, 317) is the first locking surface (
16, 116, 216, 316) or vice versa. 3. Each locking body (111, 311) is constructed as a one-piece elongated sliding strip (140, 340), which sliding strip with its radially inner strip portion Groove cutout (110, 31) of shank (109, 309)
0), and the radially outer portion of the sliding strip has a first locking surface (116, 316) on its outer circumferential surface, and a first locking surface (116, 316) following the first locking surface in steps. 2 locking surfaces (117, 317
) The tool holder according to claim 1 or 2, having: 4. Each locking body (11, 211) has a longitudinal slot (1
One cylindrical roller (13
, 213) and one sliding block (14, 21) that covers the cylindrical roller (13, 213) and supports one end in the axial direction.
4), and the cylindrical roller (13, 213)
is the groove-shaped notch (10, 2) of the tool shank (9, 209).
10) and said sliding block (14, 214)
) has a first locking surface (1
6, 216); and a second locking surface (17, 217) which follows the first locking surface in a stepped manner. Holder. 5. The slide block (14, 214) has a stopper projection (15, 214) protruding radially inward at one axial end.
215), the tool holder according to claim 4. 6. a coupling sleeve (6, 106, 206, in which each locking body (11, 111, 211, 311) communicates with a longitudinal slot (12, 112, 212, 312);
306) and is shiftable within the longitudinal cutout of the claim 306).
Tool holder as described in section. 7. Each locking body (11, 111, 211, 311) is loaded with an axial spring force, and the direction of action of the spring force is the insertion direction of the tool shank (9, 109, 209, 309). A tool holder according to any one of claims 1 to 6, which is reversely oriented. 8. A spring receiver (30) is axially supported on the coupling sleeve (6, 106, 206) at an axial distance from the locking body (11, 111, 211), and
A substantially axis-parallel spring (32, 132) connects each locking body (11,
111, 211), one for each spring receiver (30)
The tool holder according to claim 7, wherein the tool holder is disposed between and abuts against the locking body (11, 111, 211). 9. The shift sleeve (7) is connected to the coupling sleeve (6).
, 106, 206), each locking body (11, 1
11, 211), each free end of which is configured as an integral sliding strip (140). 111) or a two-part locking body (11, 211)
) is in contact with each sliding block (14, 214),
In addition, when shifting the shift sleeve (7) from the locking position to the unlocking position, each of the stoppers (34) simultaneously moves the associated locking body from the locking position to the first locking surface (16).
, 116, 216) radially to the second control surface (21, 221) into an unlocked position. tool holder. 10. Each stopper (34) has a coupling sleeve (
10. The tool holder according to claim 9, wherein the tool holder is constructed as a finger that extends through a longitudinal recess (29) provided in the tool holder (6) and reaches the respective locking body (11, 111, 211). 11. Any one of claims 1 to 10, wherein a stage transition slope (20) is provided at the transition from the first control surface (19) to the second control surface (21). Tool holder as described in section. 12. The free end of each locking body (11, 111) is provided with a diagonal end surface (3) having an angle approximately equal to the angle of the step transition slope (20).
6) is provided, and the locking body (11, 111) is supported in the axial direction by the step transition slope (20) in the unlocking position by the oblique end surface, and the locking body (11, 111) is supported in the axial direction by the step transition slope (20) in the locking release position. 12. The tool holder according to claim 11, wherein the tool holder is secured to: 13. Each locking body (11, 111) has an axial stop spring (37) in its front end region when viewed in the direction of pulling out the installed tool shank (9, 109), which axial stop spring Tool holder according to one of the claims 1 to 12, characterized in that the coupling sleeve (6, 106) extends into the longitudinal slot (12). 14. The coupling sleeve (6, 106) has a spring-loaded damping ring (26) in which each axial stop spring (37) is supported. The tool holder according to any one of items 1 to 13. 15. The axial stop spring (37) consists of a spring ring part, the generally V-shaped part of which engages in the longitudinal slot (12) and axially stops the end face of the locking body (11). an axially movable retaining ring (26) supporting and the remainder of said spring ring portion abutting the buffer ring (26);
15. Tool holder according to claim 14, wherein the tool holder is supported in a circumferential groove (38) of the tool holder (25). 16. The buffer ring (26) is axially supported by a support ring (27), which is non-shiftably held in the coupling sleeve (6) by a snap ring (29). , a tool holder according to claim 14 or 15. 17. Claims 1 to 1, wherein the stopper protrusion (15) is arranged at the rear end of the sliding block (14).
The tool holder according to any one of items 6 to 6. 18, the first control surface (19, 219) and the second control surface (21
, 221) of the coupling sleeve (6, 206),
18. The tool holder according to claim 1, wherein the tool holder is an axially non-shiftable fixed component. 19. The control ring (18) enclosing the coupling sleeve (6) has a first control surface (19) as a small-diameter inner peripheral surface of the ring, and a second control surface (19) as a large-diameter inner peripheral surface of the ring.
21) Claims 1 to 1 having
The tool holder described in any one of items 8 to 8. 20. The coupling sleeve (6) is configured as a stepped section with a medium range including each longitudinal slot (12) and secured immovably in both axial directions on the outer circumferential surface of the stepped section. 20. Tool holder according to any one of claims 1 to 19, holding a controlled control ring (18). 21. The stepped section of the coupling sleeve (6) has a first large diameter portion (22), the outer diameter of which is at least substantially the same as the small ring inner circumference of the control ring (18). 21. A tool holder according to claim 20, wherein the diameter of the surface is equal to the diameter of the surface. 22, the stepped section has a second large diameter section (23) having a larger diameter than the first large diameter section (22), the outer diameter of the second large diameter section being at least substantially controlled; Ring (18)
22. The tool holder according to claim 20 or 21, wherein the diameter is equal to the diameter of the inner circumferential surface of the large diameter ring. 23, the first large diameter portion (2) of the coupling sleeve (6)
2) to the second large diameter section (23) is provided with a frustoconical surface (24) and a control ring (18).
is fitted over the first large diameter portion (22) and second large diameter portion (23) with its small diameter and large diameter ring inner circumferential surfaces, and the step transition slope (20) has the following 23. The tool holder according to claim 22, wherein the tool holder is supported in one axial direction in abutment against the frustoconical surface (24). 24. A control ring (18) is held by the ring at its end remote from each locking body (11) in an axially non-shiftable manner relative to the coupling sleeve (6);
Any one of claims 19 to 23
Tool holder as described in section. 25. Claims 14 to 2, wherein the control ring (18) is axially supported on the buffer ring (26).
The tool holder according to any one of items 4 to 4. 26, retaining ring (25) on the end face of the control ring (18)
26. Tool holder according to claim 25, in which the retaining ring rests on a support ring (27) via a damping ring (26). 27. The stepped intermediate range of the coupling sleeve (6) has a number of longitudinal slots (12) equal to the number of locking bodies (11), which longitudinal slots extend in the radial direction. Claims 20 to 26, in which the first large-diameter portion (22) at the front transitions into a longitudinal cutout (29) that is open only radially outwards. The tool holder according to any one of the above. 28, each longitudinal slot (212) drilled in the coupling sleeve (206) substantially accommodates each cylindrical roller (2).
13), the cylindrical roller is held in the longitudinal slot so as not to shift in the axial direction, and a stopper protrusion (215) provided at the front end of the sliding block (214) is inserted into the longitudinal slot ( 212), the width of the vertical notch is approximately equal to the width of the stopper protrusion (215), and the vertical notch (241) The length of the sliding block (21
28. The tool holder according to claim 1, wherein the tool holder 4) is at least equal to the axial shift distance through which the tool holder passes when shifting from the locked position to the unlocked position. 29, the stopper projection (215) passes radially through the longitudinal cutout (241) in the locking position and in the starting position resulting after withdrawal of the tool shank (209) and forms the receiving hole of the coupling sleeve (206). 29. Tool holder according to claim 28, which penetrates into (208) and forms a stop for the end face of the tool shank (209) to be inserted. 30, a first control surface (319) and a first locking surface (316) having a small radial dimension are located in the rear end range of the locking body (311);
Claim 1 further characterized in that the second control surface (321) and the second locking surface (317) are arranged in the front end region of the locking body.
The tool holder according to any one of Items 29 to 29. 31, each locking body (311) having a first locking surface (316) and a second locking surface (317) has a control block (343)
belongs to the control block, and the control block covers the locking body (311) in a substantially shoe-like manner on the outside and is arranged so as to be non-rotatable and axially shiftable with respect to the locking body. The tool holder according to item 30. 32, each control block (343) has a shift sleeve (
32. Tool holder according to claim 31, wherein the tool holder is held axially shiftably and radially immovably in a guide ring (347) which is axially fixedly arranged inside the tool holder (307). 33, each control block (343) controls the tool shank (3
33. The tool holder according to claim 30, wherein the tool holder is guided so as to be axially shiftable in the insertion direction of 09) against the action of a spring elastic return force. 34, Lock lever (350) on control block (343)
is held pivotably, the locking lever being forced into a locking position by a radial spring force, in which the hook portion (351) of the locking lever (350) is forced into a locking position. ) passes through the longitudinal slot (312) of the coupling sleeve (306) at an axially spaced distance forward of the front end of the locking body (311) and inserts the tool shank (309) into the tool shank (309).
34. Tool holder according to any one of claims 30 to 33, which engages into a groove-like cutout (310) of a tool holder. 35, the radial spring force is applied to all locking levers (35
35. Tool holder according to claim 34, which is generated by a spring ring (352) surrounding the tool holder 0). 36, the locking lever (350) has a laterally projecting shoulder (3
53, 354), the shoulders of which ride up and radially on the frustoconical surface (355) of the coupling sleeve (306) during shifting of the shift sleeve (307) from the locked position to the unlocked position. Moving outwardly and pivoting the locking lever (350) relative to the control block (343) against the radial spring force, the hook portion (351)
) releases the tool shank (309). 37, the locking body (311) is attached to the front end, and the hook part (35
37. Tool holder according to one of claims 34 to 36, characterized in that it has a corner cutout (356) for receiving a tool holder (1). 38. An axial pressing spring (357) is disposed between the front end of the shift sleeve (307) and each locking lever (350), according to claims 30 to 37. The tool holder according to any one of the items.