JPH0677882B2 - Tool holder - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention provides a coupling sleeve drivingly connected to a drive member for transmitting the driving movement of a hand-held machine tool such as a hammer drill and receiving a tool shank. The tool shank has at least one closed groove-shaped cut-out on both sides in the axial direction and is held substantially radially movable in a longitudinal slot of the coupling sleeve. A parallel elongate locking body engages in the corresponding grooved cutout, the coupling sleeve together with the locking body being surrounded by a spring-loaded shift sleeve, and Lock the inner working surface axially fixed to the shift sleeve so as to face the inner working surface in order to lock and unlock the locking body. Form of locking surface cooperating formed, it relates to a tool holder for coupling with a hand-held machine tool the tool.

PRIOR ART Although tool holders of the above type are known, they have a wide variety of drawbacks. For example, if the depth of the groove-shaped notch (slot) formed in the tool shank does not exactly match the size of the tool holder, the inserted tool shank should be locked automatically. It is difficult. Further, only the tool can be inserted and mounted so that the arrangement type and the number of the groove-shaped notches provided in the tool shank match the arrangement type and the number of the locking bodies in the tool holder. For example, if the tool holder has four locking bodies that are arranged in sequence at substantially equal circumferential angular intervals, in order to be able to lock such a tool in the tool holder, the tool holder The shank must also have four grooved notches with a circumferential angle pitch corresponding to the locking body. In known tool holders, the axial length of the locking body is limited, so that the wear in the range of the tool shank is relatively large.

A tool holder provided with a shift sleeve having a conical taper portion and allowing the shift sleeve to cooperate with a locking ball which is short in the axial direction and therefore easily worn is disclosed in
Although it is known based on Japanese Patent No. 53-50136, in this case, an axially long locking body having a locking surface is not provided, and the conical taper portion is configured in the opposite direction. As a result, the tool holder is locked only if all locking balls are engaged in the associated thread groove. Even if the control surface or the locking surface circle is formed in a conical taper shape as in this prior art, if the cone angle is steep, the radial force component is large and the locking body is radiused by the tool shank. There is a risk of impacting in the outward direction, in which case the inserted tool may disengage. Such a situation can be avoided by reducing the cone angle, but a large shift distance by the shift sleeve is required unless some special measures are taken on the control surface parallel to the axis.

The problem to be solved by the invention is that the locking bodies can be automatically adapted to the respective depths of the grooved cutouts of the tool shank and are arranged in the tool holder. A tool in which only a smaller number of grooved notches than the number of locking bodies are provided in the tool shank can be perfectly locked, and wear of the tool shank can be reduced, which in turn can reduce the cost of the tool. To provide a tool holder.

Means for Solving the Problems According to the constituent means of the present invention for solving the above problems, there is provided a first control surface having an inner working surface extending in parallel to an axis of a tool shank and acting in a radial direction, At least a second control surface stepped at a greater radial distance from the axis with respect to one control surface, the first control surface having a radius extending substantially parallel to the axis. A first locking surface which acts in a direction, and a second locking surface which also extends substantially axially and acts in a radial direction are correspondingly arranged on the second control surface, 2 locking surfaces are stepped with respect to the first locking surface and are provided at a greater radial distance from the axis than in the case of the first locking surface,
Each locking body has, at least in part, an axial dimension that is shorter than the longitudinal slot of the coupling sleeve that receives the locking body and within the longitudinal slot from the locked position to the unlocked position. It is arranged to be shiftable in the axial direction and the radial direction, and at the locking position, the first locking surface is the first control surface, and the second locking surface is the second locking surface.
It is supported in the radial direction on the control surface, and in the unlocked position, the first locking surface is supported by the second control surface in the radial direction and the groove cutout portion of the tool shank is released. It is in.

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

The advantages obtained by the stepped parallel control or locking surfaces according to the invention are not only the reliable locking of the tool shank in the receiving hole, but also the short shift distance by the shift sleeve. Also, the tool shank can be locked by the stepped portion regardless of the total length of the locking body. Therefore, without increasing the axial length of the tool holder itself, it is possible to use a locking body that is long in the axial direction and thus has less wear.

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

In FIGS. 1 to 7, in an electric hammer drill (not shown), a driving member 2 that projects forward from a fixed casing 1 of the electric hammer drill and that causes a rotational drive, and an axial center that performs an axial impact are arranged. Only the drive member 3 is shown.

A detachable 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 the right end in FIG. 1, which mounting flange is fixed to the drive member by means of a plurality of screws. The coupling sleeve 6 is made of, for example, steel. Along the outer surface of the coupling sleeve 6, a shift sleeve 7 made of metal or plastic and axially slidable is guided. The coupling sleeve 6 has a consistently cylindrical receiving hole 8 in which a tool shank 9 of a tool (for example a drill) is inserted. Tool shank 9 is at the rear end,
It has a flat stop surface with a conical edge, which is in axial contact with the opposing stop surface of the drive member 3. The axial impact is transmitted via the stopper surface and the opposing stopper surface.

In the present embodiment, on the outer peripheral surface of the tool shank 9, there are provided a total of four groove-shaped notches 10 on both sides in the axial direction at equal circumferential angular intervals, and in each notch. One long slender locking body 11 which is substantially parallel to the axis is engaged with each. Each locking body 11 is held movably in the radial direction within a longitudinal slot 12 of the coupling sleeve 6. The longitudinal slot 12 is tapered inward in the radial direction so that the locking body 11 does not fall inward. The locking body 11 is axially slidable and radially movable in the longitudinal slot 12 in the first embodiment. This movement is caused by shifting the shift sleeve 7 from the locking position shown in FIG. 1 to the unlocking position shown in FIG. 7, as well as by the relative movement of the tool shank 9, At the time of each locking body 11
The inner working surface for locking / unlocking the above works against the facing locking surface.

Each locking body 11 is composed of a cylindrical roller 13 arranged in the longitudinal slot 12 and a sliding block 14 which covers the cylindrical roller 13 radially outside, and the sliding block is shown in FIGS.
The cylindrical roller 13 is axially supported by the stopper projection 15 at the right end as viewed in the drawings and FIG. The cylindrical roller 13 engages in the notch 10 at the locked position. The sliding block 14 has a first locking surface 16 on an arcuate outer peripheral surface, and a second locking surface 17 continuing stepwise from the first locking surface. The first and second locking surfaces 16 and 17 extend substantially in the axial direction, and the second locking surface 17 is stepped with respect to the first locking surface 16 and extends from the tool shank axis. It is arranged at a greater radial distance than the first locking surface 16. In the first embodiment, the stopper projection 15 is provided on the right end of the sliding block 14 as seen in FIG. 1 and projects radially inward to form an axial stopper for the cylindrical roller 13. ing.

The coupling sleeve 6 is configured as a stepped section in the middle range in which the longitudinal slot 12 is provided.
On the outer circumference of this stepped section is mounted a control ring 18 which is secured immovably in both axial directions. The control ring contains a coupling sleeve 6 and has a ring inner peripheral surface of a small diameter at the end portion on the left side as viewed in FIG. 1, and the ring inner peripheral surface forms a first control surface 19. There is. The control ring 18
Is provided with a large-diameter ring inner peripheral surface from the first control surface 19 toward the axial right hand side through a step transition slope 20, and the large-diameter ring inner peripheral surface forms a second control surface 21. is doing. It should be noted that another step control surface is provided between the first control surface 19 and the second control surface 21, and the step is provided between the first locking surface 16 and the second locking surface 17 of the slide block 14. It is of course possible to provide a locking surface corresponding to the attachment control surface.

Since the control ring 18 is mounted on the outer circumference of the coupling sleeve 6 so as not to be axially shiftable, the first control surface 19 and the second control surface 21 are fixed components of the coupling sleeve 6, and Sliding block for control surfaces 19, 21 1
Both locking surfaces 16, 17 of 4 are relatively shifted.

The stepped section of the coupling sleeve 6 has a first large diameter portion 22, the outer diameter of which is at least substantially ring inner peripheral surface forming the first control surface 19 of the control ring 18. Equal to the diameter of. A second large diameter portion 23 is provided following the first large diameter portion 22, the outer diameter of the second large diameter portion at least substantially forming the second control surface 21 of the control ring 18. Equal to the inner diameter of the ring. First large diameter portion 22 to second
A frusto-conical surface 24 (Fig. 2) is formed at the transition to the large diameter portion 23. The control ring 18 overlies the first large diameter portion 22 with its first control surface 19 and the second large diameter portion 23 with its second control surface 21, and the step of the control ring 18 is The transition ramp 20 abuts a frusto-conical surface 24, so that the control ring 18 is axially non-shiftably supported to the right as viewed in FIG. Retaining ring 25 on the left end of control ring 18
And the retaining ring is axially shiftable along the first larger diameter portion 22 of the coupling sleeve 6. The retaining ring 25 is elastically supported in the axial direction via a buffer ring 26 (particularly a rubber ring). The buffer ring 26 is axially supported by the support ring 27,
The support ring is non-shiftably held on the coupling sleeve 6 by a snap ring 28. In this way, the control ring 18 is axially fixed in the left hand as seen in FIG.

The intermediate area 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 directional slot is a radial through hole, and the first large-diameter portion 22 at the front is located.
In particular, as shown in FIG. 2, the transition is made to the vertical notch 29 which is open only outward in the radial direction. That is, the longitudinal cutout 29 does not reach the receiving hole 8 in the radial direction.

Since the axial dimension of each locking body 11 composed of the cylindrical roller 13 and the sliding block 14 is shorter than that of the vertical slot 12 having the locking body built therein, each locking body 11 has an axial length within the vertical slot 12. It can be reciprocally shifted in any direction. In the locking position shown in FIG. 1, the cylindrical roller 13 is fitted in the groove-shaped notch 10 of the tool shank 9 and is locked so as to be secured in the axial direction and to transmit torque. The sliding block 14 as well as the cylindrical roller 13 are also in the locked position. Sliding block in this locked position
The first locking surface 16 of 14 is applied radially to the first control surface 19, so that already by this application the sliding block 14 and thus the cylindrical roller 13 moves radially outwards and the tool shank 9 Can not be released. The second locking surface 17 of the sliding block 14 is also applied radially to the second control surface 18 of the control ring 18.

On the other hand, for example, in the unlocked position shown in FIG. 6 or 7, the first locking surface 16 of the sliding block 14 is brought into radial contact with the second control surface 21 of the control ring 18. There is.
In short, the sliding block 14 is shifted rightward in the axial direction, and at the same time, it is radially outwardly shifted by the level difference between the first control surface 19 and the second control surface 21, so that the cylindrical roller 13 is formed in the groove. That is, it can be detached from the notch 10. Therefore, the tool shank 9 is in the released state.

In the illustrated control ring 18, an intermediate surface is provided between the first control surface 19 and the second control surface 21, which is stepped with respect to both control surfaces. This interface also serves the same control purpose.

As can be seen from the above, in FIG. 1, from left to right, the first
The control surface 19 is followed by a second control surface 21, and the first locking surface 16 is followed by a second locking surface 17. In short, the step is performed so that the diameter increases from left to right in FIG. Since not only the cylindrical roller 13 but also the sliding block 14 are received in the longitudinal slot 12, the sliding block 14 is secured in the circumferential direction.

At the right end near the mounting flange 4 as seen in FIG. 1, the coupling sleeve 6 is axially supported by two split cup-shaped spring bearings 30 which are provided in a plurality of recesses. Inside each of the sliding blocks 14, one spring 32 (in particular, a cylindrical coil spring) is provided, one for each sliding block 14, and the left end of the spring 32 is a stopper projection 15 of the sliding block 14.
It is applied to the end of the side. In this way, each locking body 11, and also its sliding block 14, is loaded by the axial spring force, and the direction of the spring force is opposite to the inserting direction of the tool shank 9.

The shift sleeve 7 is fixed in position in one axial direction on the coupling sleeve 6 by a snap ring 33. The shift sleeve 7 can be shifted in the direction opposite to the axial direction. The shift sleeve has a plurality of axially extending finger-shaped stoppers 34 (see FIG. 3) connected to the left end in FIG. 1 in the outer peripheral area of the coupling sleeve 6. Oriented towards each locking body 11. The stopper 34 may be formed integrally with the shift sleeve 7 or, as in the illustrated example, the portion of the ring 35 that abuts against and is loaded by the front end of the shift sleeve 7. Good. Each of the finger-shaped stoppers 34 has a vertical cutout 29 in the coupling sleeve 6.
Through the axial direction to reach each of the sliding blocks 14, and the stopper 34 is in contact with the left end surface of the sliding block 14 at the locking position. Accordingly, if the shift sleeve 7 is shifted to the right as viewed in FIG. 1, each slide block 14 simultaneously moves axially from the locked position to the unlocked position via the stopper 34 against the action of the spring 32. To the right, until the first locking surface 16 reaches the height of the second control surface 21 and is radially supported by the second control surface. Each sliding block 14 has a slanted end surface 36 at the left end in FIG. 1 on the radially outer side of the working surface of each stopper 34, the inclination angle of which is the angle of the step transition slope 20 of the control ring 18. be equivalent to. When the slide block 14 reaches the unlocked position (FIG. 6), the slide block 14 is axially supported by the inclined end surface 36 on the step transition inclined surface 20 of the control ring 18 to release the lock. Secured in position (Fig. 6).

An axial stop spring 37 is provided at the front end of each cylindrical roller 13 (on the left hand in FIG. 1), and the axial stop spring is supported by the coupling sleeve 6 and, in short, the axial direction. Is non-shiftable and penetrates into the longitudinal slot 12 in the radial direction at least to the height of the cylindrical roller 13. The axial stop spring 37 is composed of a ring spring portion formed by bending a wire rod, and the ring spring portion is approximately
It extends over a 90 ° circumferential angle and is almost V-shaped (3rd
(Fig.) To engage the inside of the vertical slot 12 to support the left end face of the cylindrical roller 13. The remaining portion of the ring spring portion is received and supported in the circumferential groove 38 of the retaining ring 25. In this way, the axial stop spring 37 serves as a buffer ring.
It is elastically supported and cushioned via 26, whereby the locking and unlocking movements of the tool shank 9 are totally damped.

In order to unlock the tool shank 9 locked in FIG. 1, the shift sleeve 7 is manually shifted to the right hand as viewed in FIG. 1, but with this, the finger-shaped stopper 34 The four sliding blocks 14 are shifted to the right via the action of each spring 32 via. At that time, a sliding block
Reference numeral 14 is a first locking surface 16 along the first control surface 19 and a second locking surface 17 along the second control surface 21 until it reaches a step, for example, a step transition slope 20. Move. Upon reaching the step transition slope 20, each sliding block 14 makes a radial movement corresponding to a step until the first locking surface 16 now abuts the second control surface 21 in the radial direction. Along with this, the cylindrical roller 13 escapes outward in the radial direction and the groove-shaped notch of the tool shank 9
Leave 10 The tool is then released and can be completely removed. The shift of the cylindrical roller 13 to the left due to this removal is elastically limited by the axial stop spring 37. Each sliding block 14 is provided with a beveled end surface 36 so that the step transition bevel 20 is axially supported, at least while the tool shank 9 is still in the area of the cylindrical roller 13. The tool shank 9 has reached outside the range of the cylindrical roller 13 and the cylindrical roller 13
When it becomes possible to enter the receiving hole 8 radially inward, the sliding block 14 is shifted from right to left again to the starting position by the relaxing action of the spring 32, the first locking surface 16 The slope 39 at the transition between the second locking surface 17 and the
Sliding block from the position shown in FIGS. 7 and 8 to the position shown in FIG.
Assists radial return of 14 until the stopper projection 15 abuts the right end of the cylindrical roller 13 (unless the left end of the sliding block 14 has already abutted the finger stop 34 of the ring 35).

When inserting the tool shank 19, the cylindrical roller 13 is shifted to the right through the conical edge provided on the right end face side of the tool shank 9. The cylindrical roller 13 abuts on the stopper projection 15, whereby the sliding block 14 is also shifted toward the right hand against the action of the spring 32. Sliding block during this shift exercise
14 is shifted via the stepped curved surface of the control ring 18, that is to say 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,
Cylindrical rollers 13 and sliding blocks 14 escape radially outward and open the path for fully inserting tool shank 9. The tool shank 9 is now pushed along the cylindrical roller 13, which then cuts into the grooved cutout 10 of the tool shank 9.
Can invade inside. This is done as follows. That is, the sliding block 14 is shifted to the left along the stepped surface of the control ring 18 via the relaxing spring 32,
The locking position of FIG. 1 where the cylindrical roller 13 is locked so that it cannot escape in the radial direction is reached. This allows the tool shank 9
Is locked.

Effects of the first embodiment The intermediate step between the first control surface 19 and the second control surface 21 is used depending on the circumstances of the tool. That is, depending on the depth of the groove-shaped notch portion 10 of the tool shank 9, the sliding block 14 has the first control surface 19
Or, it stays on the intermediate control surface with a slightly larger diameter.
In short, the locking position of the cylindrical roller 13 is determined by the depth of the groove-shaped notch 10 of the tool shank 9 at each time. It is therefore possible to fit the grooved notches 10 of different depths of the tool shank 9 and also to the grooved notches 10 which are worn to a greater or lesser extent depending on the frequency of use.

When a tool shank 9 having only two groove-shaped notches 10 is used instead of having four groove-shaped notches 10 as shown in the drawing, the remaining two cylindrical rollers are retained when the tool shank 9 is locked. 13 remains in the disengaged position shown in FIG. 6 and contacts the smooth outer peripheral surface of the tool shank 9.

By stepping the inner peripheral surface of the control ring 18 and the outer peripheral surface of each sliding block 14 in the form of a stepped curved surface, the shift movement distance of the shift sleeve 7 is substantially equal to that of the individual locking bodies 11.
Becomes irrelevant to the length of. In addition, despite the automatic tool locking, the longitudinal slot in the coupling sleeve 6 is
The length of 12 is also practically only slightly larger than the length of the locking body 11. The locking body 11 automatically fits to the depth of each groove-shaped notch 10 in the tool shank 9. Thus
Tools which have fewer grooved cuts 10 in the tool shank 9 than the number of locking bodies 11 provided in the tool holder 5 are also successfully locked. Yet another advantage is
It is still possible to use a tool in which the grooved notch of the tool shank 9 has already been considerably worn by working with another hand-held electric machine tool. This possibility of use is obtained by the automatic adaptation of the catch 11 to the respective depth of the grooved cutout 10. A further advantage is that virtually any length of the locking body 11 is possible, which results in the wear on the tool shank 9 being kept as little as possible, which in turn leads to a reduction of the insertion end of the tool shank 9. This is advantageous because it makes it possible to select an affordable material in terms of cost and accordingly reduces the tool cost. Further, since a pure one-touch operation and automatic locking are guaranteed when the tool shank is inserted, this point also has industrial utility value.

The difference between the second embodiment shown in FIG. 8 and the first embodiment is that the individual locking bodies 111 are configured as an integral elongated sliding strip 140 as a whole, and the sliding conditions are the same. The strip portion located inward in the radial direction is at the point where it engages in the groove-shaped notch 110 of the tool shank 109, like the cylindrical roller 13 of the first embodiment. The radially outward portion of the sliding strip 140 has a first locking surface 116 on the outer peripheral surface thereof and a second locking surface 117 continuing at a step from the first locking surface 116. Sliding strip 1
As a result of being integrated as 40, the need for relative shift movement between the cylindrical roller 13 and the sliding block 14 in the first embodiment is eliminated in the locking body 111. In the second embodiment, the spring 132 acts on the right end of the sliding strip 140.

Effect of the Second Embodiment The advantage of the second embodiment shown in FIG. 8 is that the structure of the locking body 11 becomes simpler.

In the third embodiment shown in FIGS. 9 and 10, the locking body 211 is composed of two parts as in the case of the first embodiment. The locking body 211 is a cylindrical roller 213 and a first locking surface belonging to the cylindrical roller 213.
216 and a sliding block 14 having a second locking surface 217. However, unlike the first embodiment, the stopper projection 21
5 is provided on the front end (on the left hand in FIG. 9) of the sliding block 214. The longitudinal slot 212 of the coupling sleeve 206 is not longer than the cylindrical roller 213, unlike the first embodiment. The cylindrical rollers are non-shiftable in the longitudinal slot 212 at least substantially axially. The left end of the vertical slot 212 is followed by a narrower vertical notch 241 in which the stopper projection 215 engages. The width of the longitudinal cutout 241 is at least approximately equal to the width of the stopper projection 215. The length of the longitudinal cutout 241 is at least equal to the axial shift distance that the sliding block 214 passes through when shifting from the locked position to the unlocked position. The stop projections 215 extend radially through the longitudinal cutouts 241 and, in the locking position shown, enter into the receiving holes 208 of the coupling sleeve 206 and form a stop for the end of the unloaded tool shank 209. When the tool shank 209 is installed, the stopper projection 215 engages in the groove-shaped notch 210 of the tool shank 209. In contrast to the first embodiment, the buffer action of the axial stopper 37 and the buffer ring 26 is lacking. Instead, the left end of the control ring 218 is a snap ring 2
It is axially fixed in position on the coupling sleeve 206 directly via 28. In the same manner as in the first and second embodiments, the control ring 218 has a first control surface 219 and a second control surface 221 on the inner peripheral surface thereof, and as will be clearly understood from the drawings, the first and second control surfaces 221 and 221 are provided. An intermediate control surface 242 is provided between the control surfaces.

In the third embodiment, when the tool shank 209 is inserted, only the sliding block 214 is axially shifted by the penetrating tool shank 209. Stopper protrusion 2 in which the conical edge at the end of the tool shank 209 is inserted into the receiving hole 208 during insertion
Abut on the left end of 15. When the tool shank 209 is further pushed, only the sliding block 214 is shifted from the position shown in FIG. 9 toward the right hand, and finally the sliding block 214 is moved in the radial direction so that the first locking surface 216 becomes the first locking surface 216. 2 The control surface 221 is supported in the radial direction, which results in the tool shank.
The cylindrical roller 213 can escape radially outwardly until the cylindrical roller 213 is completely pushed in and the cylindrical roller 213 reaches into the groove notch 210 of the tool shank.

Effects of the third embodiment The configuration according to the third embodiment is also particularly simple and easy, and the cost is low.

In the fourth embodiment shown in FIGS. 11 to 16, a special control block 343 belongs to each locking body 311 configured as an integral sliding strip 340, which control block is a sliding strip. It covers the outer side of the housing 340 in a generally chewed manner and guides the sliding strip by means of two side walls 344, 345. The control block 343 is axially shiftable relative to the sliding strip 340, but both are non-rotatable.

Each control block 343 is guided so as to be axially shiftable in a recessed portion provided on the inner peripheral surface of the guide ring 347 and substantially parallel to the axis, and is held so as not to be rotatable in the radial direction. The guide ring 347 seats fixedly in the shift sleeve 307.

The control block 343 has a second control surface 321 between the side walls 344 and 345 in the left-hand end range as viewed in FIGS. 11, 15 and 16, and the second control surface is shown in FIG. The intermediate control surface 342 follows to the right hand side, and then the first control surface 319 is attached to the intermediate control surface.
The radial distance of the first control surface from the axial center is smaller than that of the second control surface 321 because the first control surface has a downward step shape. In short, in contrast to the first embodiment, the individual control surfaces 319, 342, 321 of the control block 343 do not have their radial dimension increasing from left to right as in the first embodiment, As can be seen from Fig. 11, the time passes from right to left.

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

Each control block 343 faces the right hand as seen in FIG.
In short, the tool shank 309 can be axially shifted in the inserting direction against the return spring force of the spring 332. Spring
332 is centered and mounted in a pocket 348 provided at the rear end of control block 343. Control block 343,
As shown in FIG. 11, a locking lever 350 is fitted in a recessed portion 349 that forms a downward slope toward the left hand, and is pivotally 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 levers 350 are held in the locked position via spring forces acting radially from the outside to the inside. The spring force is produced by an O-ring 352 which together encloses all locking levers 350. In the locking position, the hook portion 351 of the locking lever 350 penetrates the longitudinal slot 312 of the coupling sleeve 306 at the front of the front end of the sliding strip 340 and is spaced apart in the time direction, and the groove notch of the tool shank 309. Department
Engaged into 310.

The locking lever 350 has shoulders 353 and 354 which are laterally flared on both sides at a position radially spaced from the hook portion 351 and which are on the frustoconical surface 355 of the front part of the coupling sleeve 306. It can be ridden and then moved upwards along the frusto-conical surface whereby the locking lever 350 is lifted radially outwards and pivots upward against the action of the spring force of the O-ring 352. Hook portion 351 releases tool shank 309 as it is urged.

In particular, as can be seen from FIGS. 13 and 16, the sliding strip 340 has a corner cutout 356 at its front end for receiving the hook portion 351. Front end of shift sleeve 307 and each locking lever 350
An axial pressure spring 357 configured as a cylindrical coil spring is arranged between the and, which transmits the shift movement of the shift sleeve 307 to the locking lever 350, and which also locks the locking lever. Via the control block 343 and keep the locking lever 350 in that position.

The individual control blocks 343 are each moved via a locking lever 350. When the tool shank 309 is inserted, the free end of the tool shank abuts the hook portion 351. This causes the locking lever 350, and thus the control block 343, to shift from the left to the right in FIG. 11 against the action of the spring 332 when the tool shank 309 is pushed. At that time, sliding strip 3
When the second control surface 321 shifts toward the right and disengages from the second locking surface 317 to the extent that the 40 can be released in the radial direction, the sliding strip 340 is thereby moved in the radial direction. The sliding strip 340 is moved radially outward until it is released and the first locking surface 316 makes radial contact with the second control surface 321. At the same time locking lever 350
Moves outwards along the frusto-conical surface 355 with the shoulders 353, 354, whereby the hook portion 351 releases the path out of the receiving hole 308 and into which the tool shank 309 can be pushed. .

When the tool shank 309 is fully inserted, the locking lever 350 and the sliding strip 340 are shifted toward the left hand as seen in FIG. 11 due to the loosening action of the spring 332, so that the tool shank is locked. It In this locking position, the individual locking lever 350 is O
It is retained by the ring 352 while keeping the shoulders 353, 354 in contact with the coupling sleeve 306.

To unlock the tool shank 309, the shift sleeve 307 is shifted toward the right hand as seen in FIG. Along with this, the control block 343 is simultaneously shifted by the axial interlocking action, and the locking lever 350 is also shifted together via the pressing spring 357, and finally the tool shank 30 is moved in the above-mentioned manner.
Effect of Fourth Embodiment Leading to Release of 9 Also in the case of the fourth embodiment, the tool shank 309 does not have the four grooved notches 310, but has only two grooved notches. If not, the extra control block 434 and the locking lever 350 remain in the unlocked disengaged position, so that in this embodiment too, for example, the insertion of a tool shank 309 having only two or only one groove-shaped notch. Will be possible.

In the tool holder of the fourth embodiment, the locking body 311 is slid on the strip 340.
It has the advantage that it can be constructed significantly longer in the form of.
This contributes to reduced wear. Further, when the tool shank 309 is locked, even if the sliding strip 340 closes the entire groove-shaped notch 310 in the working position to the left hand side in FIG. 11, the hook portion 351 is located on the tool shank 309. It is advantageous because it can be listed.

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

Advantageous Effects of the Invention By providing the interacting control surface and the locking surface of the locking body, the shift distance of the shift sleeve is at least substantially independent of the length of the locking body. In addition, the length of the vertical slot in the tool holder is slightly larger than the length of the locking body itself, despite the fact that the tool can be locked automatically only by a pure one-touch operation. There is nothing. In particular, the tool holder according to the invention makes it possible to automatically adapt the locking body to the respective depths of the grooved cutouts provided in the tool shank.
Not only that, a tool having only a grooved notch in the tool shank smaller than the number of locking bodies built in the tool holder can also be successfully locked.
For example, even if the tool holder has four locking bodies built in, a tool having only two grooved cuts in the tool shank can be successfully locked. In this case 2
The two locks rest on the outer circumferential surface of the tool shank and are in contact with the outer peripheral surface of the tool shank, while the other two locks are engaged radially into the groove notch of the tool shank. The tool shank is locked in the axial direction and the rotation is interlocked. On the basis of the automatic adaptation to different depths of the grooved cut-outs of the tool shank, it is still possible to use tools whose grooved cut-outs are already considerably worn. Yet another advantage is that the insertion of the tool allows the material for the end to be selected at an affordable cost, which saves tool costs and uses virtually any length of lock. It is possible to reduce wear in the tool shank, and the industrial utility value of the present invention is extremely high.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional view of a tool holder together with a driving member of a hammer drill according to a first embodiment of the present invention taken along the line I--I in FIG. 3, and FIG. 2 is a schematic perspective view of only a coupling sleeve. , FIG. 3, FIG. 4, and FIG.
The schematic cross-sectional views along the lines III-III, IV-IV, and V-V in FIG. 6, and FIGS. 6 and 7 are tools substantially corresponding to FIG. 1 when the tool is mounted and when the lock is released. FIG. 8 and FIG. 9 are schematic longitudinal sectional views of the holder part, and FIG.
FIG. 10 is a schematic vertical sectional view of a tool holder portion according to an embodiment and a third embodiment, FIG. 10 is a schematic plan view of a coupling sleeve portion of the tool holder shown in FIG. 9, and FIG. 11 is substantially equivalent to FIG. A schematic axial longitudinal sectional view of a tool holder portion according to the fourth embodiment, FIG. 12, FIG. 13 and FIG. 14 are respectively taken along line XII-XII, line XIII-XIII and line XIV-XIV of FIG. FIG. 15 is a schematic perspective view of a control block of the tool holder shown in FIGS. 11 to 14, and FIG.
FIG. 4 is a schematic exploded perspective view of a control block of the tool holder and the associated locking body shown in the figure. 1 ... Casing, 2 ... Drive member for rotational drive, 3 ...
… Drive member for axial impact, 4… Mounting flange, 5
...... Tool holder, 6 ... Coupling sleeve, 7 ...
… Shift sleeve, 8 …… Receiving hole, 9 …… Tool shank, 10 …… Groove notch, 11 …… Locking body, 12 …… Longitudinal slot, 13 …… Cylindrical roller, 14 …… Sliding block, 15 ……
Stopper protrusion, 16 ... First locking surface, 17 ... Second locking surface,
18 ... Control ring, 19 ... First control surface, 20 ... Step transition slope, 21 ... Second control surface, 22 ... First large diameter portion, 23 ... Second large diameter portion, 24 ... Frusto-conical surface, 25 ... retaining ring, 26
…… Buffer ring, 27 …… Support ring, 28 …… Snap ring, 29 …… Vertical notch, 30 …… Spring receiver, 31 …… Recess, 32 …… Spring, 33 …… Snap ring, 34 …… Finger -Shaped stopper, 35 …… ring, 36 …… diagonal end surface, 37
...... Axial stop spring, 38 ...... Circumferential groove, 39 ...... Slope, 106 ...... Coupling sleeve, 109 ...... Tool shank, 110 ...... Groove notch, 111 ...... Locking body, 116 ...... First
Locking surface, 117 ... Second locking surface, 132 ... Spring, 140 ... Slipping strip, 206 ... Coupling sleeve, 208 ... Reception hole, 209 ... Tool shank, 210 ... Groove notch Department, 211 ...
… Locking body, 212 …… Vertical slot, 213 …… Cylindrical roller,
214 …… Slip block, 215 …… Stopper protrusion, 216 ……
First locking surface, 217 ... Second locking surface, 218 ... Control ring,
219 ... First control surface, 221 ... Second control surface, 228 ... Snap ring, 241 ... Longitudinal cutout, 242 ... Intermediate control surface, 306 ... Coupling sleeve, 307 ... Shift sleeve, 308 ...... Receiving hole, 309 ...... Tool shank, 310 ......
Groove-shaped notch, 311 …… Locking body, 312 …… Vertical slot,
316 ... first locking surface, 317 ... second locking surface, 319 ... first
Control surface, 321 ... Second control surface, 332 ... Spring, 340 ... Sliding strip, 342 ... Intermediate control surface, 343 ... Control block, 34
4,345 ... Side wall, 346 ... Recessed part, 347 ... Guide ring, 348 ... Pocket, 349 ... Recessed part with downward slope,
350 …… Locking lever, 351 …… Hook part, 352 …… O-ring, 353,354 …… Shoulder, 355 …… Frusto-conical surface, 356 …… Corner cutting part, 357 …… Pressing spring

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Gehrhard Mikesner Reinhuelden-Ech Taderingen Marcomannenschütraße 3 (72) Inventor Karl Weaner Reinhuelden-Ech Taderingen-Germany Malt Keshu Ultase 10

Claims (38)

[Claims] 1. A coupling sleeve is provided which is drivingly connected to a driving member for transmitting a driving movement of a hand-held machine tool such as a hammer drill and which receives a tool shank, wherein the tool shank is in an axial direction. A longitudinally extending elongate locking body having at least one closed groove-like cutout, viewed in a radial direction, held radially movable in a longitudinal slot of the coupling sleeve,
Correspondingly engaged in the groove cutout, the coupling sleeve together with the locking body is surrounded by a spring-loaded shift sleeve and is axially stationary with respect to the shift sleeve. An inner working surface provided on the inner working surface for cooperating with a locking surface formed on the locking body so as to face the inner working surface in order to lock and unlock the locking body. In a tool holder for connecting a tool to a hand-held machine tool, an inner working surface extends parallel to an axis of the tool shank (9,109,209,309) and acts in a radial direction with a first control surface (19,219,319), At least a second control surface (21, 221, 32) stepped at a greater radial distance from the axis with respect to the control surface.
1) and having a first control surface (19, 219, 319) extending substantially parallel to the axis and acting in a radial direction.
The locking surface (16,116,216,316) is the same as the second control surface (2
1,221,321) is also provided with a second locking surface (17,117,217,317) corresponding to the first locking surface (17,117,217,317) that also extends substantially in parallel with the axis and acts in the radial direction. 16, 116, 216, 316) and are provided at a greater radial distance from the axis than in the case of the first locking surface, and each locking body (11, 111, 211, 311) is at least partially Longitudinal slots (12,212,31) in body-receiving coupling sleeves (6,106,206,306)
It has a shorter axial dimension than 2) and is axially and radially shiftable from the locking position to the unlocking position in the longitudinal slot, and at the locking position, the locking is performed. The surface (16,116,216,316) is on the first control surface (19,219,319) and the second locking surface (17,117,217,3).
17) is supported by the second control surface (21, 221, 321) in the radial direction, and in the unlocked position, the first locking surface (1
6,116,216,316) are radially supported on the second control surface (21,221,321) and are coupled to the tool shank (9,109,209,30).
A tool holder characterized in that the groove-shaped notches (10, 110, 210, 310) in 9) are released. 2. The second control surface (21,221,321) is the first control surface (1) when viewed in the inserting direction of the tool shank (9,109,209,309).
9,219,319) and the second locking surface (17,117,217,317)
Tool holder according to claim 1, characterized in that it follows the first locking surface (16,116,216,316) or vice versa. 3. Each locking body (111, 311) is configured as an integral elongated sliding strip (140, 340), the sliding strip having a strip portion radially inward of the tool shank (). (109, 309) engages in the groove notch (110, 310),
Further, the radially outward portion of the sliding strip has a first locking surface (116, 316) on the outer peripheral surface and a second locking surface (117, 317) following the first locking surface in steps. The tool holder according to claim 1 or 2. 4. A cylindrical roller (13,21) in which each locking body (11,211) is housed in a longitudinal slot (12,212).
3) and one sliding block (14, 214) that covers the cylindrical roller (13, 213) and axially supports one end thereof, and the cylindrical roller (13, 213) is a tool shank (9, 209).
In the groove-shaped notch (10, 210) and the sliding block (14, 214) is formed on the outer peripheral surface of the portion radially outward.
Tool according to claim 1 or 2, characterized in that it has a locking surface (16,216) and a second locking surface (17,217) which follows the first locking surface in steps. Holder. 5. A stopper projection (15, 2) having a sliding block (14, 214) projecting radially inward at one axial end.
The tool holder according to claim 4, which has 15). 6. Claims, wherein each locking body (11,111,211,311) is received and shiftable in a longitudinal cutout in a coupling sleeve (6,106,206,306) in communication with a longitudinal slot (12,112,212,312). Item 1 to 5
The tool holder according to any one of items 1 to 10. 7. The lock body (11,111,211,311) is loaded by an axial spring force, and the acting direction of the spring force is opposite to the inserting direction of the tool shank (9,109,209,309). Any one of items 1 to 6
Tool holder described in item. 8. A spring bearing (30) is axially supported by a coupling sleeve (6, 106, 206) at an axial distance from a locking body (11, 111, 211) and is substantially parallel to the shaft (32, 132). 7) is arranged between the spring receiver (30) and the locking body (11, 111, 211), and is applied to the locking body, one for each locking body (11, 111, 211). Tool holder described in item. 9. The shift sleeve (7) is provided in the outer peripheral area of the coupling sleeve (6, 106, 206) so that each locking body (11, 111, 21).
Stopper (34) oriented axially towards 1)
And each free end of the stopper is attached to each locking body (111) configured as an integral slide strip (140) or to a two-part locking body (11, 211). The stoppers (34) are in contact with the respective sliding blocks (14, 214), and at the same time when the shift sleeve (7) is shifted from the locking position to the unlocking position, the locking bodies to which the stoppers (34) belong are simultaneously From the locking position, connect the first locking surface (16,116,216) to the second control surface (21,2).
21) The tool holder according to any one of claims 4 to 8, which is axially shifted to an unlocking position that is supported in the radial direction. 10. Each of the stoppers (34) is configured as a finger which penetrates a longitudinal notch (29) provided in the coupling sleeve (6) and reaches each locking body (11, 111, 211). The tool holder according to claim 9. 11. A first control surface (19) to a second control surface (21)
The tool holder according to any one of claims 1 to 10, wherein a step transition slope (20) is provided at a transition to. 12. A free end portion of each locking body (11, 111) is provided with an oblique terminating surface (3) having an angle substantially equal to the angle of the step transition slope (20).
6) is provided, and the slanted end surface causes the locking body (11, 111) to move to the step transition slope (20) at the unlocked position.
12. The tool holder according to claim 11, which is axially supported by and secured at the unlocked position. 13. Each locking body (11,111) has an axial stopper spring (37) in the front end region when viewed in the direction of pulling out the mounted tool shank (9,109), and the axial stopper spring (37) is Tool holder according to any one of claims 1 to 12, which is supported by the coupling sleeve (6, 106) and extends into the longitudinal slot (12). 14. A coupling sleeve (6,106) having a spring-loaded cushioning ring (26) on which each axial stop spring (37) is supported. Tool holder described in item. 15. The axial stopper spring (37) comprises a spring ring portion, the substantially V-shaped portion of the spring ring portion engaging in the longitudinal slot (12) to engage the end face of the locking body (11). Axial support and the remainder of the spring ring portion is
Tool holder according to claim 14, which is carried in a circumferential groove (38) of an axially movable retaining ring (25) which is in contact with a buffer ring (26). 16. A damping ring (26) is axially supported by a support ring (27), said support ring being non-shiftably retained on the coupling sleeve (6) by a snap ring (29). The tool holder according to claim 14 or 15. 17. The stopper projection (15) has a sliding block (1).
4) The tool holder according to any one of claims 5 to 16, which is arranged at a rear end of the tool holder. 18. A first control surface (19,219) and a second control surface (2
Tool holder according to any one of claims 1 to 17, characterized in that 1,221) is a fixed component of the coupling sleeve (6,206) that is not axially shiftable. 19. A control ring (18) including a coupling sleeve (6) has a first inner surface of a ring having a small diameter.
A control surface (19) and a second control surface (21) as an inner peripheral surface of a ring having a large diameter.
The tool holder according to any one of items up to item 18. 20. A coupling sleeve (6) is configured as a stepped section in the middle range containing each longitudinal slot (12), and on the outer peripheral surface of the stepped section in both axial directions. Holding a control ring (18) secured immovably,
The tool holder according to any one of claims 1 to 19. 21. A stepped section of the coupling sleeve (6) has a first large diameter portion (22), the outer diameter of the first large diameter portion being the inner peripheral surface of the small diameter ring of the control ring (18). The tool holder according to claim 20, wherein the tool holder is at least substantially equal to the diameter of the. 22. The stepped section has a second large diameter portion (23) having a larger diameter than the first large diameter portion (22), the outer diameter of the second large diameter portion being controlled. Tool holder according to claim 21, which is at least substantially equal to the diameter of the inner surface of the large diameter ring of the ring (18). 23. A frusto-conical surface (24) is provided in the transition part of the coupling sleeve (6) from the first large diameter portion (22) to the second large diameter portion (23) and is controlled. Ring (18)
The first and the second inner surfaces of the small and large diameter rings.
The large-diameter portion (22) and the second large-diameter portion (23) are fitted over and supported by the step transition slope (20) by abutting against the truncated conical surface (24) in one axial direction. Has been
The tool holder according to claim 22. 24. A control ring (18) is retained at its end remote from each locking body (11) by an axially non-shiftable ring with respect to the coupling sleeve (6). Any one of claims 19 to 23
Tool holder described in item. 25. The control ring (18) is a buffer ring (26).
The tool holder according to any one of claims 19 to 24, which is axially supported by the tool holder. 26. The holding ring (25) is in contact with the end surface of the control ring (18), and the holding ring is supported by the support ring (27) via the buffer ring (26). Tool holder according to item 25. 27. The stepped mid-range of the coupling sleeve (6) has a number of longitudinal slots (12) equal to the number of locking bodies (11), said longitudinal slots being provided. Claim 21 to claim 23, in which the radial cut-out extends in the radial direction and at the front first large-diameter portion (22), transitions to a longitudinal notch (29) opened only radially outward. The tool holder according to any one of items up to item 26. 28. Each longitudinal slot (212) bored in a coupling sleeve (206) has substantially the length of each cylindrical roller (213), said cylindrical roller within said longitudinal slot. In the longitudinal notch (241), which is held so as not to be axially shiftable, and which is provided at the front end of the sliding block (214) with a stopper protrusion (215) following the longitudinal slot (212). The width of the vertical cutout is substantially equal to the width of the stopper projection (215), and the length of the vertical cutout (241) is set so that the sliding block (214) is engaged from the locking position. A tool holder according to any one of claims 5 to 27, which is at least equal to the axial shift distance passed when shifting to the stop release position. 29. A coupling sleeve (206) radially extending through the longitudinal notch (241) in the locked position of the stopper projection (215) and in the starting position after the tool shank (209) has been withdrawn. Enter into the receiving hole (208) of
Tool holder according to claim 28, which also forms a stop for the end face of the tool shank (209) to be inserted. 30. A first control surface (31) having a small radial dimension.
9) and the first locking surface (316) are arranged in the rear end range of the locking body (311), and the second control surface (321) and the second locking surface (317) are arranged in the front end range of the locking body. The tool holder according to any one of claims 1 to 29, which is provided. 31. A first locking surface (316) and a second locking surface (317).
A control block (343) belongs to each locking body (311) having a lock, and the control block covers the locking body (311) from the outside and cannot rotate relative to the locking body. And arranged so as to be axially shiftable.
Tool holder described in item 30. 32. Each control block (343) is held axially shiftable and radially non-rotatable in a guide ring (347) fixedly fixed inside the shift sleeve (307) in the axial direction. The tool holder according to claim 31, which is: 33. A method according to claim 31, wherein each control block (343) is guided so as to be axially shiftable in the inserting direction of the tool shank (309) against the action of the restoring force of the spring elasticity. Alternatively, the tool holder according to item 32. 34. A control lever (35) is attached to a control block (343).
0) is pivotably held and the locking lever is forced into the locked position by a radial spring force,
In the locking position, the hook portion (351) of the locking lever (350) is axially spaced in front of the front end of the locking body (311) and the longitudinal slot (312) of the coupling sleeve (306). ) Through the groove shank (310) into the grooved notch (310) of the tool shank (309).
The tool holder according to any one of items up to item 3. 35. Tool holder according to claim 34, in which a radial spring force is generated by a spring ring (352) which together encloses all locking levers (350). 36. The locking lever (350) has a hook portion (351).
Laterally extending shoulders (353, 354) at radial intervals from the coupling sleeve (306) during shifting of the shift sleeve (307) from the locked position to the unlocked position. ) On the frusto-conical surface (355) and moves outward in the radial direction, against the spring force in the radial direction, and relative to the control block (343), the locking lever (35).
Tool holder according to claim 34 or claim 35, wherein the hook portion (351) releases the tool shank (309) by swiveling the (0). 37. Claims 34 to 36, characterized in that the locking body (311) has at its front end a corner cutout (356) for receiving the hook part (351). One of
Tool holder described in item. 38. An axial pressing spring (357) is arranged between the front end of the shift sleeve (307) and each locking lever (350). The tool holder according to any one of items 1 to 10.