JPS63123679A - Tool holder - 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 the Invention The present invention relates to a tool holder with an inner tool receiving sleeve for connecting a tool to a hand-held power machine, in particular a drill hammer with a striking mechanism.

BACKGROUND OF THE INVENTION Hand-held power machines, in particular small and relatively lightweight drill hammers, are known (DE-A-35 06 695), on which a tool holder of the above-mentioned type is fixedly mounted. The tool holder is provided with a tool receiving sleeve having a coaxial receiving hole in its front part, into which the shaft of a tool adapted to the tool holder can be inserted. Furthermore, the tool-receiving sleeve has at least one radially movably held inwardly projecting locking body, for example designed as a ball, which locking body extends radially out of the area of the receiving bore. The tab lock body, which is movable against the action of a spring, is movable and locks in order to unlock the tool when a tool is inserted or by moving the locking sleeve. The stop body engages in an axial locking groove which is closed on both sides when the tool is inserted. Furthermore, the tool-receiving sleeve has at least one radially inwardly projecting projection, for example in the form of a tooth, which, when the tool is inserted, has an open axial direction on the end side of the tool. Fits positively within the groove.

This engagement provides rotational entrainment, whereas the engagement of the locking body in the locking groove allows the tool to pivot in the tool-receiving sleeve with limited axial movement. Locked in direction. The tool-receiving sleeve in the tool holder of the drill hammer is always driven in rotation in the case of such easy-to-operate, small, inexpensive drill hammers, which weigh approximately 2 kg, for example.

When the striking mechanism is disconnected, only a rotational drive is performed, whereas when the striking mechanism is connected, a striking operation and a rotational drive superimposed thereon are performed. It is impossible to shut off the rotating operation.

Such a tool holder makes the above-mentioned type of drill hammer unsuitable for pure chisel operation, and this chisel operation is such that such a drill hammer can temporarily perform pure short chisel work. desired to.

In the tool holder according to the invention, the separate striking and mounting device, in which the tool holder is configured at least approximately correspondingly to the tool holder on the machine side, is configured as a chuck, except that the tool receiving sleeve is configured non-rotatably. There is.

Effects of the Invention The advantages of the tool holder according to the present invention are that the chuck can be quickly and easily installed on the tool holder of a drill hammer without difficulty, and in this case, it can be automatically connected to the drill hammer at the same time. The advantage is that it can be quickly and easily uncoupled from the drill hammer. As a result, a drill hammer can be changed to a chisel hammer that allows unrestricted chisel operation and pure hammer operation. Therefore, for striking and mounting, a chisel can be inserted as a tool into the chuck, and this tool is held non-rotatably within the chuck and is loaded so as to perform only the striking operation. Even more advantageously,
The chuck can be fixed at any angular position for striking and mounting relative to the drill hammer and the tool holder of the drill hammer, and therefore the chisel inserted into the chuck can be mounted at any position relative to the drill hammer. can take the following angular positions. This allows for extremely satisfactory operation. For installation, as in the case of work that does not use a chuck, the same grip can be provided on the chuck when the chuck is fitted over the chuck, and this grip can also be fixed directly to the tool holder on the machine side. can. This grip can also be fixed at any rotational position relative to the chuck during striking and mounting. Since it is possible to perform work without using this grip, it is possible to work even when the space is narrow. Furthermore, it is advantageous that the impact/installation remains unchanged within the chuck.
The same tool can also be inserted into the tool holder on the machine side. In other words, there are no restrictions to this extent, including no restrictions regarding the durability of the chisel. The mounting means that the chuck is completely insulated and has the same advantages as the tool holder on the machine side.

Advantageous embodiments of the invention are described in the subclaims.

The exemplary drawings show a tool holder 11 which is known per se in terms of structure (German Patent Application No. 3,506,695).
．． 4) illustrates the front range of the drill hammer.

The drill hammer 1o has an electric drive (not shown) which drives the coupling sleeve 12 in rotation in the tool holder 11 via a transmission. Furthermore, the drill hammer 10 has a striking mechanism 13 which is designed as an air cushion striking mechanism and has a striking body 1δ and an intermediate striking element 16 in a hollow piston 14. The intermediate striker transmits the striking energy to a tool inserted into the coupling sleeve 12-, for example a drill.

Drill hammer 1o is a relatively lightweight and inexpensive commercially available device weighing approximately 2 kg. For cost reasons or because it is only used for drilling purposes, the rotary drive for rotating the coupling sleeve 12 cannot be switched off in such drill hammers.

As is known, the coupling sleeve 12 has in its front part a receiving bore 17 for receiving the shaft of an inserted tool (not shown), which receiving bore has radially internal grooves formed as teeth. At least one projection 18 is provided which projects in the direction.

When the tool shaft is inserted, this projection engages positively into an axial groove opened toward the end of the tool shaft. As a result, the tool inserted into the coupling sleeve is rotated.

Furthermore, the tool holder 11 has a locking device (not shown) in the front region of the connecting sleeve 12, via which the inserted tool can be moved back and forth in the axial direction, but cannot be moved excessively. is locked in the axial direction to prevent movement. The locking device has at least one locking body, for example a ball, which is seated in a radially continuous slot of the connecting sleeve 12 and which is loaded by a spring force in the left direction in the drawing. has been done. An axial locking groove that is closed on both sides in the tool shaft cooperates with the locking body.

When a tool suitably adapted with respect to the shaft is inserted into the tool holder of the drill hammer 10, the end of the tool radially and outwardly projects the locking body in the axial direction. The tool shaft can be pushed further in the axial direction into the receiving bore 17 of the connecting sleeve. In this case, at least one projection 18 engages in an axial groove of the tool shaft, which is open at the end that cooperates with this projection. Furthermore, the at least one locking body is snapped into the associated locking groove of the tool shaft under an axial spring force. When the drill hammer is connected, the tool inserted through the connecting sleeve 12, which is driven in rotation, is likewise driven in rotation. If the striking mechanism is connected at the same time, the striking energy is transmitted from the intermediate striking element to the end of the tool shaft facing the intermediate striking element, so that the tool performs an axially forward striking movement. The return stroke is caused by the reaction force when the tool hits the workpiece.

Furthermore, the tool holder 11 has a tool holder neck 19 located in the housing 20, to which a grip is fixed in the usual manner via a clamping band. Fixing of the grip takes place on the cylindrical outer surface 21 of the tool holder neck 19.

The tool holder 110 locking device (not shown) is surrounded by a locking sleeve 22 which is held movably on the connecting sleeve 12 and/or on the tool holder 19 and At least one locking body is loaded in a known manner. Lock sleeve 2 for unlocking
2 is moved to the right in the drawing against the action of an axial spring force, whereby at least one locking body is disengaged from the locking groove.

A dustproof cap 23 is held at the front end of the connecting sleeve 12.

A further tool holder 30 is shown in the drawing, which is used to connect a tool 31 to the drill hammer 10. The tool consists of a chisel, the shaft 32 of which has at least one axial groove 33 open towards the end and at least one axial locking groove 34 closed on both sides. have.

The tool holder 30 has an inner tool-receiving sleeve 35 which is designed as a separate striking and mounting chuck and which, unlike the connecting sleeve 12 of the tool holder 11 on the machine side, is designed non-rotatably. In other respects, the striking and mounting chuck is at least approximately constructed in the same way as the tool holder 11 of a drill hammer.

For striking and mounting, the chuck has nine casing parts 36 with an annular overfitting part 37 at the right end as seen in the drawing, and the overfitting part allows the casing part 36 to be used as a tool for the tool holder 11 on the machine side. It is fitted over the holder neck 19. The overfitting part 37 is the vertical slit 3
8, and clamping eyes (of these clamping eyes, only clamping eye 39 is shown) on both sides of the vertical slit when viewed in the same direction. A tightening screw engages the two through the eye, and the overfitting portion 37 is fixed to the tool hole and the rudder neck portion 19 by the tightening screw.

At an axial distance from the overfit part 37, the casing part 36 has a cylindrical fixed neck 40 with a cylindrical outer surface 41, the dimensions of which are equal to the tool holder neck 19 and which are larger than the fixed neck. The striking and mounting method is the same as when the chuck is covered and fitted, and the grip can be fixed by hand when tightening.

Furthermore, the housing part 36 has an essentially sleeve-shaped inner receptacle 42 in which the tool-receiving sleeve 35 is fixedly received and held. This is done by selecting the appropriate diameter and tightening type. Furthermore, the receptacle 42 has radially inwardly projecting projections 43, 44 spaced apart from one another in the axial direction, which projections are designed as annular webs. The protrusion is the tool receiving sleeve 35
It engages in a recess 45, 46, e.g. an annular groove, formed in the outer surface of. Therefore, the tool receiving sleeve 35
2 in an axially and circumferentially fixed manner.

The tool receiving sleeve 35 has a cylindrical receiving hole 47 corresponding to the receiving hole 17 in the front region of the connecting sleeve 12 . This receiving hole 47 is used to receive the shaft 32 of the tool 31. The tool-receiving sleeve 35 has at least one projection 48 that corresponds to the projection 18 of the tool holder 11 and projects radially inward.

When the tool 31 is inserted, the projection 48 engages positively into the axial groove 33 opened on the end side of the shaft 32.

Furthermore, the tool-receiving sleeve 35 as well as the coupling sleeve 12 have at least one locking body 50 designed as a radially movable ball in the opening 49, e.g. It is held in place via 51 and is movable towards disk 52 . This disk is pushed to the left in the drawing by a spring 53. At least one locking body 50 cooperates with the shaft 320 locking groove 34 .

A striking pin 5 is located within the rear portion 54 of the tool receiving sleeve 35.
5 is held, the striking pin being guided in the tool-receiving sleeve so that it can rotate freely relative to the tool-receiving sleeve and can be moved back and forth in the axial direction. During striking and mounting, the striking pin 55 loads the tool 31, which is formed as a chisel inserted into the chuck, so as to exclusively give a striking motion, but is not loaded so as to give an additional rotational motion. It is used to make. The striking bit 155 has a connecting end 56 projecting from the tool-receiving sleeve 35 to the right in the drawing, and this connecting end is inserted into the connecting sleeve 12 of the tool holder 11 of the drill hammer 10 like a tool. , accepted and concatenated.

The connecting end 56 has at least one axial groove 57, which axial direction 1 m 57 is open towards the end, similar to the tool shaft 32. The connecting end 56 is cylindrical and is dimensioned in this case with a diameter equal to the inner diameter of the receiving bore 17 of the tool holder 11 and exactly the same as the diameter of the tool shaft 32 . At the front, the percussion pin 55 has, for example, a somewhat larger head part 58 in terms of diameter, which head part is supported and guided inside a guide hole 59 in the rear part 54 of the tool-receiving sleeve 35 . The guide hole 59 extends coaxially with the receiving hole 47 and is connected to this receiving hole. The guide hole is adapted to the head part 58 and has a somewhat larger diameter than the receiving hole 47. At the rear end, the guide hole 59 has four strut horns, for example a strut horn ring 60. The head part 58 rests axially on this stock/earring by means of a radially projecting shoulder surface 61. This provides a loss prevention effect.

At an axial distance from the stone ring, the guide bore 59 transitions into the receiving bore 47 by a frusto-conical small diameter section 62 . This small-diameter portion 62 likewise functions as a stop I which limits the axial travel of the axis-parallel movement of the striking pin 55 in this direction; collaborate.

The tool-receiving sleeve 35 is received and held in the front region of the housing part 36, which supports the receptacle 42.

A locking sleeve 64 is arranged next to this front region, which locking sleeve rests on the tool-receiving sleeve and/or.
1 or is movably held on the front region of the casing part 36. The locking sleeve 62 is designed like the locking sleeve 22 of the tool holder 11. At the front end, a dustproof cap 65 is disposed on the tool receiving sleeve 35 corresponding to the dustproof cap 23, and this dustproof cap 6
5 has a double lip like the dustproof cap 23.

The casing part 36, the locking sleeve 64 and the dustproof cap 65 are made of plastic. On the other hand, the striking pin 55 and the tool-receiving sleeve 35 are each made of metal, with the tool-receiving sleeve in particular consisting of a hardened steel component. Therefore, the blow pin 1
55 and the tool-receiving sleeve 35 ensure impeccable durability and long service life.

In contrast to the tool shaft 32, the connecting end 5 of the striking horn 55
6 only comprises at least one axial groove 57 which is open in the axial direction, but not at least one axial locking groove 34 which is closed on both sides.

For normal drilling or striking and drilling operations of the drill hammer, a separate striking and mounting of the tool holder 30, which is designed as a chuck, is not necessary. That is, the tool holder 30 is not fitted overly.

On the other hand, if the drill hammer is used for pure percussion operation without an additional rotational drive, i.e. for pure chisel operation, the percussion - Attachment: The chuck is attached to the tool holder 11.

In this case, the impact/installation is done by covering the chuck with the fitting part 37.
The tool holder neck portion 19 is fitted over the tool holder neck portion 19, and the tightening is fixed. In the case of a slip-on, the connecting end 56 of the striking pin 55 engages in the receiving bore 17, in which case at least one locking body is pushed out in the aforementioned manner radially in the locking sleeve 22 and axially direction, but the locking sleeve 22 is not moved. In this case, the projection 18 engages in the axial groove 57. The impact-fitting is limited by the axial stop of the overfit portion 37 of the tool holder when the chuck is fully overfitted.

This state is the state shown in the figure. The end of the striking pin 55 on the face side occupies the working area of an intermediate striking element 160, which loads the striking pin 5δ with the striking energy generated by the striking mechanism 13.

For impact-installation, a tool 31 serving as a chisel is inserted into the chuck. In this case, the shaft end first moves the locking body 50 in the radial direction and moves the disc 52 in the axial direction.
is crimped. If the tool 31 is inserted further, this disk is moved axially against the action of the spring 53, and then the locking groove 34 reaches the area of the locking body 50 and the locking body 50
is engaged in the locking groove 34 under the action of the spring 53. The protrusion 48 engages in the axial groove 53 opened at the end. The tool 31 is therefore axially locked in the tool-receiving sleeve 35, but is guided in an axially reciprocating manner under the impact action of the striking pin 55. Rotation of the tool relative to the tool-receiving sleeve 35 is locked by the cooperation of the projection 48 within the axial groove 33.

The tool-receiving sleeve 35 is likewise held non-rotatably in the housing part 36 by means of its fixation in the receptacle 42, which is itself clamped non-rotatably on the tool holder neck 19 by means of a snap-fit part 37. Therefore, the chisel-shaped tool 31 cannot be rotated and pure chisel work can be carried out. The drill hammer 10 is connected,
Similarly, the striking mechanism 13 of the drill hammer is connected and drilled, and the connecting sleeve 12 is rotationally driven within the tool holder.

Furthermore, the percussion mechanism 13 generates percussion energy.

The engagement of the protrusion 18 into the axial groove 57 causes the striking pin 5 to
5 is also rotationally driven. The head part 58 of the striking pin rotates freely in the guide hole of the tool-receiving sleeve without transmitting any rotational movement. From the striking mechanism 13 to the striking pin 55
The striking energy transmitted to the striking pin 55 is transmitted via the head part 58 to the end of the tool 31 facing this head part. In other words, the tool as a chisel is loaded in such a way that it only performs a percussion movement.

In a further embodiment, not shown, the connecting end 56 has a stepped smaller diameter section, at least in the working area in which the projection 18 engages in the axial groove 57, the outer diameter of the smaller diameter section being radial. It is smaller than the inner circle drawn by the head of the protrusion 18 located on the inner side in the direction. Therefore, the blow-ton 55
A locking with a torque-transmitting effect of a projection designed as a tooth is not necessary. In any case, striking pin 55
The small diameter section at the connecting end weakens the striking pin and reduces its durability.

In the case of a snap-fitting striking and mounting of the type described above, the drill hammer is particularly well protected against dust ingress by the double-sided dust cap 23.65 in pure chisel operation with a chuck. In addition, the chuck is drilled for impact and installation.
Each can be fixed to the tool holder neck 19 in any relative rotational position relative to the tool holder.

This allows the chisel to assume any desired angular position relative to the drill hammer. The operator can therefore best hold the drill hammer without any constraints, and the chisel tool can nevertheless be best adjusted to the workpiece. It is furthermore advantageous to insert the tool into the chuck for striking and mounting, without the need for the inserted tool shaft to have a different shape from that required for the tool holder, and which is not particularly limited in terms of durability. I can't stand it. The shaft of the tool is independent of whether the tool is inserted directly into the tool holder 11 of the drill mill 10 or into the chuck if the tool is inserted into the chuck when working with a chuck. is always the same. For attachment, the grip that is attached during normal operation of a drill hammer without a chuck can be similarly fixed to the fixed neck 40 in the above-mentioned manner when a chuck is attached. There are no restrictions when working with the chuck. In this case as well, the grip can be fixed at any relative rotational position relative to the chuck during striking and mounting. Furthermore, it is advantageous that the snap-fitting striking and mounting means that the chuck, like the tool holder 11 of the drill gun 1o itself, is completely insulated, so that no disadvantages arise in this respect either. Furthermore, the chuck is easy to operate, lightweight, and inexpensive when it comes to striking and mounting. Furthermore, said attachment allows the chuck to be attached to the tool holder of the drill hammer without difficulty and to be detached again. In the overfitting state, the chuck changes from a drill hammer to a pure chisel hammer for striking and mounting, and in this case, no rotational drive is performed for the tool 31.

FIG. 2 is a schematic axial sectional view of the front part of a drill hammer with a tool holder;

10--Drill hammer, 11.30--Tool holder, 12--Connecting sleeve, 13--Blowing mechanism, 10-
...Hollow piston, 15...Blowing body, 16-...Intermediate striking element, 17.47...Receiving hole, 18.43.4 Cow,
48...Protrusion, 19...Tool holder neck, 20...
・Casing, 21.41.63...Outer surface, 22...
・Lock sleeve, 23.65...Dust-proof cap, 31
...Tool, 32...Shaft, 33.57...Axial groove, 34-...Lock groove, 35-...Tool receiving sleeve, 36...Casing part, 37...Overfitting Part, 38...Vertical slit, 39...Tighten with eye,
40...Fixed neck, 42...Receptor, 45.46.
... recess, 49 ... opening, 50 ... locking body, 51
...Outer ring, 52...Disk, 53--Spring, 54--Rear portion, 55--Strike pin, 56--
- Connection end, 58 - Head part, 59 - Guide hole, 60 - Stopper ring, 61 - Shoulder surface, 62 -
...Small diameter part, 64...Locking sleeve.

Claims (1)

Claims: 1. A tool holder with an inner tool-receiving sleeve (35) for connecting a tool to a hand-held power machine, in particular a drill hammer (10) with a striking mechanism (13), comprising:
The tool holder is provided with a separate percussion hammer, in which the tool holder is constructed at least approximately correspondingly to the machine-side tool holder (11), except that the tool receiving sleeve (35) is constructed non-rotatably.
Tool holder, characterized in that it is configured as a mounting chuck (30). 2. A casing part (3) where the impact/installation chuck (30) can be fitted over the tool holder neck (19) on the machine side.
6), and the striking and mounting chuck is arranged in the rear part (54) of the tool-receiving sleeve (36), freely rotatable within the tool-receiving sleeve relative to the tool-receiving sleeve and axially A striking pin (which is guided in a reciprocating manner and loads only to strike the inserted tool (31)
55), the striking pin is adapted to be inserted into the tool receiving sleeve (12) of the tool holder (11) on the machine side by means of the protruding connecting end (56), and 2. A tool holder according to claim 1, wherein the tool holder is receivable and connectable in the tool-receiving sleeve, such as the shaft of a tool inserted into the tool-receiving sleeve in the case of an overfitting. 3. The connecting end (56) of the striking pin (55) is provided with at least one axial groove (57) that is open toward the end. tool holder. 4. The striking pin (55) has a front head portion (58) which is connected to the tool receiving sleeve (35).
is supported and guided in a guide hole (59) in its rear part (54), which guide hole is coaxial with and connected to the tool receiving hole (47). A tool holder according to any one of claims 1 to 3. 5. A stop that limits the axial travel of the tool into which the guide hole (59) is inserted in at least one direction, in particular a stop surface (60) cooperating with the associated surface (61, 63) of the head part (58). , 62), the tool holder according to claim 4. 6. The guide hole (59) is connected to the stopper ring (60) at the rear end.
), and this stopper ring has a head portion (5
6) is axially abutted by a radially projecting shoulder surface (61) and is prevented from being lost.
Tool holder as described in section. 7. An inwardly protruding locking body which is movably held in the radial direction in the receiving hole (47) in which the tool receiving sleeve (35) receives the shaft of the inserted tool (31) at its front part. (50), which locking body engages positively in the axial locking groove (34) closed on both sides of the tool shaft when the tool shaft is inserted, and at least 7. A tool holder according to claim 1, which is used to create a connection that allows limited relative axial movement. 8. At least one locking body (50) consists of an axially spring-loaded ball, which ball is held movably in a radial slot (49) of the tool-receiving sleeve (35). Then, when the tool shaft is further inserted, the ball is pushed out of the tool receiving sleeve (35) against the spring force in the axial direction, and then the ball is pushed into the locking groove (3) under the action of the spring.
4) Claim 7 adapted to engage within
Tool holder as described in section. 9. The tool-receiving sleeve (35) has at least one projection (48) projecting radially inward, which projection opens on the end side of the tool shaft when the tool shaft is inserted. Claims 1 to 8 adapted to engage positively within the axial groove (33).
The tool holder described in any one of the preceding items. 10. The tool holder according to any one of claims 1 to 9, wherein the tool receiving sleeve (35) is made of a tubular metal member. 11. Tool holder according to any one of claims 1 to 10, characterized in that the tool receiving sleeve (35) is made of a hardened steel member. 12, the tool receiving sleeve (35) is attached to the casing part (3
6). The tool holder according to claim 1, wherein the tool holder is received and held in the front region of the tool holder. 13. The casing part (36) has a substantially sleeve-shaped inner receiving part (42) in which the tool receiving sleeve (35) is received at least in the rear part (54) and in the axial direction. and a tool holder according to any one of claims 1 to 12, which is held immovably in the circumferential direction. 14. The generally sleeve-shaped receptacles (42) have radially inwardly projecting projections (43;
44), and the protrusion has a tool receiving sleeve (35).
14. Tool holder according to claim 13, which engages in recesses (45, 46) starting from the outer surface of the tool holder. 15, the casing part (36) is attached to the tool receiving sleeve (3
6) at an axial distance from the tubular overfit portion (3).
15. The tool holder according to any one of claims 1 to 14, characterized in that the over-fitting part is over-fitted on the tool holder neck (19) on the machine side. 16. Tool holder according to claim 15, in which the overfitting part (37) is immovably fastened to the neck of the tool holder on the machine side by means of a tightening screw. 17. The overfitting part (37) has at least one longitudinal slit (38) and clamping eyes (39) in the circumferential direction, which clamping eyes can be clamped together by clamping screws, The tool holder according to range 15 or 16. 18. The casing part (36) is fitted over the fitting part (37)
), which has a cylindrical fixed neck (40) at an axial distance from the fixed neck (40), the dimensions of which correspond to the tool holder neck (19) on the machine side, and which has a grip on the fixed neck. 18. The tool holder according to claim 1, wherein the tool holder is fixable by a tightening hand. 19. A locking sleeve (64) is rotatably or movably held in the tool-receiving sleeve (35) and/or in the casing part (36), by means of which at least one locking body (50) is the locking sleeve (
64) is lockable in one position and releasable in a position offset relative to this position to unlock an inserted tool. The tool holder according to any one of the items. 20. Tool holder according to any one of claims 1 to 19, characterized in that the tool-receiving sleeve (35) has a dust-proof cap (65) at its front end. 21. Tool according to one of claims 1 to 20, wherein the casing part (36) and/or the locking sleeve (64) and/or the dust cap (65) are made of plastic. holder.