JP2663972B2 - Tool holder - Google Patents

Description

Description: The invention relates to a tool holder of the type described in the preamble of claim 1. 2. Description of the Related Art Hand-held power machines in which a tool holder of the above type is fixedly mounted, in particular a small and relatively light drill hammer, are known (DE-A-350 669 5). The tool holder has a tool receiving sleeve having a coaxial receiving hole in a front part, into which a shaft of a tool adapted to the tool holder can be inserted. Furthermore, the tool receiving sleeve has at least one inwardly projecting locking body, which is embodied, for example, as a sphere and is held radially movably, which locking body extends radially from the area of the receiving bore. It is movable against the action of a spring, i.e. the locking body is movable when the tool is inserted or for unlocking the tool by moving the locking sleeve, and The locking body engages in a closed axial locking structure on both sides when the tool is inserted. Furthermore, the tool receiving sleeve has at least one radially inwardly projecting projection, e.g. formed as a tooth, which can be opened at the end of the tool when the tool is inserted. Formally engages the premises. While the rotation entrainment is performed by this engagement,
The engagement of the locking body in the locking premises causes the tool to be axially locked in the tool receiving sleeve so that limited axial movement is possible. The tool receiving sleeve in the tool holder of the drill hammer is driven in such a way that it is always rotatable in the case of such a small and inexpensive drill hammer, for example, weighing approximately 2 kg. When the striking mechanism is shut off, only the rotational drive is performed, whereas when the striking mechanism is connected, the striking operation and the rotational drive superimposed thereon are performed. It is not possible to shut off rotary operation. With such a tool holder, a drill hammer of the above-mentioned type is not suitable for a pure hoop operation, which is temporarily short with such a drill hammer. Desired to be able to perform the work. The tool holder according to the invention has the features described in the characterizing part of claim 1. Advantageous Effects of the Invention The advantage of the tool holder according to the present invention is that the hitting and mounting chuck can be provided on the tool holder of the drill hammer quickly and easily without difficulty, and in this case, it can be automatically connected to the drill hammer at the same time, and quickly from the drill hammer. And the connection can be easily broken. This allows the drill hammer to be used as a sledge hammer which cuts off the rotary drive and allows for unrestricted sling operation, i.e. pure percussion operation. Therefore, a chisel can be inserted as a tool into the impact and mounting chuck,
The tool is held non-rotatably in the hammering and mounting chuck and is loaded so as to perform only the hammering operation. More advantageously, the hitting and mounting chuck can be fixed at any angular position relative to the drill hammer and the tool holder of the drill hammer, whereby the hitting and mounting chuck can be fixed relative to the spring drill hammer inserted into the mounting chuck. Any angular position can be taken in any way, so that the operation can be carried out very well. The same grip as the mounting chuck can be provided when the mounting chuck is overlaid, as in the case of the operation without the mounting chuck, and this grip can be directly fixed to the tool holder on the machine side. This grip can also be fixed at any rotational position with respect to the hitting / mounting chuck. Since the work without using the grip can be performed, the work can be performed even when the space condition is narrow. It is furthermore advantageously possible to insert the same tool permanently in the hammering and mounting chuck and also in the tool holder on the machine side. In other words, there is no restriction as long as this is the case, for example, there is no restriction on durability of the chisel. The mounting chuck is completely insulated, like the tool holder on the machine side, and has the same advantages to this extent. Advantageous embodiments of the invention are described in the dependent claims. 1 shows a front view of a drill hammer with a tool holder 11 which is known per se (DE-A-350 669 5). The drill hammer 10 has an electric drive (not shown), which is driven by a tool holder via a transmission.
The connection sleeve 12 is rotationally driven in the inside 11. Furthermore, the drill hammer 10 has a striking mechanism 13, which is designed as an air cushion striking mechanism and has a striking body 15 and an intermediate striking element 16 in a hollow piston 14. The intermediate striker transmits striking energy to a tool, for example a drill, inserted in the coupling sleeve 12. The drill hammer 10 is a relatively lightweight and inexpensive commercial tool weighing approximately 2 kg. Because such lightweight drill hammers 10 are used exclusively for drilling holes for expansion plugs, such drill hammers have a connecting sleeve.
The rotation drive for rotating 12 cannot be shut off. In a known manner, the connecting sleeve 12 has in its front part a receiving hole 17 for receiving a shaft of a plug-in tool (not shown), which has a radially inwardly formed tooth. At least one projection 18 projecting in the direction is provided. When the tool shaft is inserted, it engages positively in the axial yard which is open towards the end of the tool shaft. As a result, torque is transmitted to the tool inserted into the connecting sleeve. Furthermore, the tool holder 11 has a locking device (not shown) in the area in front of the connecting sleeve 12, through which the tool inserted can be reciprocated in the axial direction, but not excessively. Is locked in the axial direction to prevent the movement of The locking device has at least one locking body, for example a ball, which is mounted in a radially extending slot of the connecting sleeve 12 and which is spring-loaded to the left as viewed in the drawing. Have been loaded. The locking body cooperates with an axial locking groove which is closed on both sides in the tool shaft. If a suitably adapted tool for the shaft is inserted into the tool holder of the drill hammer 10, the end of the tool is fitted with a radially inwardly projecting locking body in the radially outward and axial direction. The tool shaft can be pushed further axially into the receiving bore 17 of the connecting sleeve. In this case, at least one projection 18 engages in the axial premises of the open tool shaft at the end cooperating with this projection. Furthermore, the at least one locking element is snapped into the associated locking structure of the tool shaft under an axial spring force. When the drill hammer is connected, the tool inserted via the rotationally driven connecting sleeve 12 is similarly rotationally driven. At the same time, if the striking mechanism is connected, 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 makes a striking movement forward in the axial direction. 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 provided on a casing 20, to which the grip is fixed in a conventional manner via a clamping band.
The fixing of the grip takes place on the cylindrical outer surface 21 of the tool holder neck 19. The locking device (not shown) of the tool holder 11 is a locking sleeve.
Surrounded by 22 this locking sleeve is movably held on the coupling sleeve 12 and / or on the tool holder 19 and loads at least one locking body in a known manner. For unlocking, the locking sleeve 22 is moved to the right in the drawing against the action of the 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. The drawing shows another tool holder 30 used to connect the tool 31 to the drill hammer 10. The tool consists of a chisel, and this chisel shaft 32 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 is designed as a separate hitting and mounting chuck and has a connecting sleeve for the tool holder 11 on the machine side.
It has an inner tool receiving sleeve 35 which is different from 12 and is non-rotatable. In all other respects, the impact and mounting chuck is at least substantially identical to the tool holder 11 of the drill hammer. The hitting and mounting chuck has a casing part 36 provided with an annular cover fitting part 37 at the right end as viewed in the drawing, and the casing part 36 is provided by the cover fitting part.
Is fitted over the tool holder neck 19 of the tool holder 11 on the machine side. The cover fitting portion 37 has a vertical slit 38 and fastening eyes (only the fastening eyes 39 are shown) on both sides of the vertical slit when viewed in the circumferential direction. A clamping screw engages via both clamping eyes, by means of which the over-fitting part 37 is clamped to the tool holder neck 19. Axially spaced from the overfit portion 37, the casing portion 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. The grip can be fixed by a clamping hand in the same manner when the hitting / mounting chuck is fitted over the fixed neck. Furthermore, the housing part 36 has a substantially sleeve-shaped inner receiving part 42 in which the tool receiving sleeve is located.
35 is immovably received and held. This is done with a suitable diameter selection and clamping scheme. In addition, the receiving part 42 has radially inwardly projecting projections 43, 44 which are axially spaced from one another and are formed as annular webs. The projection engages in a recess 45, 46 formed in the outer surface of the tool receiving sleeve 35, for example in an annular premises. Accordingly, the tool receiving sleeve 35 is positively held axially and circumferentially positively in the receiving part 42. The tool receiving sleeve 35 has a cylindrical receiving hole 47 in the front region corresponding to the connecting sleeve 12 and corresponding to the receiving hole 17. This receiving hole 47 is used to receive the shaft 32 of the tool 31. The tool receiving sleeve 35 is a protrusion on the tool holder 11.
At least one projecting radially inward corresponding to 18
It has two projections 48. Projection when tool 31 is inserted
48 positively engages in the axial groove 33 opened on the end side of the shaft 32. Furthermore, the tool receiving sleeve 35 and the connecting sleeve 12 are open.
49, for example, having at least one locking body 50 formed as a sphere held radially movably in the slit, which locking body is held in place via an outer ring 51. And can be moved toward the disk 52. This disk is pushed to the left as viewed in the drawing by a spring 53. At least one locking body 50 is provided on the locking groove 34 of the shaft 32.
Work with In the rear part 54 of the tool receiving sleeve 35, a striking pin 55 is retained, which can freely rotate in the tool receiving sleeve relative to the tool receiving sleeve and can reciprocate in the axial direction. You are being guided. Blow pin 55
Is to load the tool 31, which is formed as a chisel inserted into the hammering / installation chuck, exclusively to give a striking motion, but not to give an additional rotary motion. Used. The striking pin 55 has a connecting end 56 projecting rightward in the drawing from the tool receiving sleeve 35, and this connecting end is fitted into the connecting sleeve 12 of the tool holder 11 of the drill hammer 10 like a tool. , Received and connected. The connecting end 56 has at least one axial groove 57 which is provided in the tool shaft 32.
Opened towards the end as well. The connecting end 56 is cylindrical, the diameter of which is equal to the inside diameter of the receiving hole 17 of the tool holder 11 and is dimensioned exactly the same as the diameter of the tool shaft 32. In the front, the striking pin 55 has a head portion 58 which is, for example, somewhat larger in diameter, and which is guided in a guide bore 59 in the rear portion 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 portion 58 and has a slightly larger diameter than the receiving hole 47. At the rear end, the guide hole 59 has a stopper surface, for example, a stopper ring 60. A head portion 58 abuts in the axial direction by a shoulder 61 projecting radially from the stopper. Thereby, a detachment preventing effect can be obtained. The guide hole 59 is shifted to the receiving hole 47 by a frusto-conical small-diameter portion 62 at an axial distance from the stopper. This small diameter portion 62 also functions as a stop which limits the axial travel of the axis-parallel movement of the striking pin 55 in this direction, with which the corresponding substantially frusto-conical outer surface 63 of the head portion 58 cooperates. Work. The tool receiving sleeve 35 is received and held in the front area of the casing part 36, which supports the receiving part 42. Following this front area is a locking sleeve 64, which is movably held on the tool receiving sleeve and / or on the front area of the housing part 36. The locking sleeve 64 is the locking sleeve 22 of the tool holder 11
It is formed as follows. Tool receiving sleeve at front end
A dust-proof cap 65 is arranged on 35 in correspondence with the dust-proof cap 23, and the dust-proof cap 65 has a double rib like the dust-proof cap 23. Casing part 36, locking sleeve 64, and dust cap 65
Is made of plastic. The striking pin 55 and the tool receiving sleeve 35, on the other hand, are each made of metal, in which case the tool receiving sleeve is preferably made of a hardened steel part. Thus, the striking pin 55 and the tool receiving sleeve 35 guarantee impeccable durability and a long service life. In contrast to the tool shaft 32, the connecting end 56 of the striking pin 55 has at least one axial groove 57 which is axially open, but at least one axial locking groove which is closed on both sides. 34 is not equipped. The need for a tool holder 30 configured as a separate striking and mounting chuck for the normal drilling or hammering and drilling operation of the drill hammer is unnecessary. That is, the tool holder 30 is not fitted over. On the other hand, if the drill hammer is to be used for pure percussion without additional rotary drive, i.e. -The mounting chuck is mounted on the tool holder 11. In this case, the hitting / mounting chuck is fitted over the tool holder neck 19 by means of the cover fitting portion 37, and is tightened and fixed. When fitted, the connecting end 56 of the striking pin 55 engages in the receiving bore 17, in which at least one locking body is pushed radially in the aforementioned manner in the locking sleeve 22 and is axially displaced. In the direction against the action of the spring, but the locking sleeve 22 is not moved. In this case, the projection 18 engages in the axial groove 57. The complete overfitting of the impact and mounting chuck is limited by the axial stop of the overfitting portion 37 of the tool holder. This state is shown in the figure. The end on the end face side of the striking pin 55 occupies the working range of the intermediate striking element 16, which loads the striking pin 55 with the striking energy generated by the striking mechanism 13. A tool 31 as a play is inserted into the hitting / mounting chuck. In this case, the locking body 50 is first moved radially by the end of the shaft and pressed against the disk 52 in the axial direction. If the tool 31 is further inserted, the disk is moved axially against the action of the spring 53, the locking groove 34 then reaches the area of the locking body 50 and the locking body 50 is And engages in the locking groove 34. A projection 48 is engaged in the axial groove 33 opened on the end side. Accordingly, the tool 31 is axially locked in the tool receiving sleeve 35. In this case, the tool is guided so as to be able to reciprocate in the axial direction under the impact of the impact pin 55. The rotation of the tool relative to the tool receiving sleeve 35 is locked by the cooperation of the projection 48 in the axial groove 33. The tool receiving sleeve 35 is likewise non-rotatably held in the housing part 36 by the fixing in the receiving part 42, which itself is overlaid with the cover part 37.
As a result, it is tightened and fixed to the tool holder neck 19 so that it cannot rotate. Accordingly, the chisel-shaped tool 31 cannot be rotated, and a pure chiseling operation can be performed. When the drill hammer 10 is connected and the hitting mechanism 13 of the drill hammer is also connected, the connecting sleeve 12 is driven to rotate in the tool holder.
Further, the striking mechanism 13 generates striking energy. The impact pin 55 is also driven to rotate by the engagement of the projection 18 in the axial groove 57. The head portion 58 of the striking pin is free to rotate in the guide hole of the tool receiving sleeve without transmitting rotational movement. The striking energy transmitted from the striking mechanism 13 to the striking pin 55 is transmitted from the striking pin 55 via the head portion 58 to the end of the tool 31 facing the head portion. That is, the tool as a chisel is loaded so as to perform only a striking motion. In another embodiment, not shown, the connecting end 56 is provided with a stepped small diameter at least in the working area where the projection 18 engages in the axial groove 57, the outer diameter of which is smaller than the radius. It is smaller than the inner circle drawn by the head of the projection 18 located inward in the direction. Thus, a torque-transmitting engagement of the projection formed as a tooth with the striking pin 55 is unnecessary. In any case, the small diameter portion provided at the connecting end of the striking pin 55 weakens the striking pin and reduces the durability of the striking pin. In the case of a purely sliding operation with a hit-and-shoot hook of the above-mentioned type, the drill hammers are perfectly prevented by the dust caps 23, 65, especially dust. Furthermore, the hitting and mounting chuck can be fixed to the tool holder neck 19 at any arbitrary relative rotational position relative to the drill hammer. This allows the tool as a chisel to assume any angular position with respect to the drill hammer. Thus, the operator is able to hold the drill hammer without restriction and the tool as a chisel is nevertheless best adjusted to the work location. It is furthermore advantageous that what is required for the tool holder with respect to the tool shaft to be inserted does not need to have a different shape and that tools which are not particularly limited with regard to durability can be inserted into the hitting and mounting chuck. . The shaft of the tool is always the same, regardless of whether the tool is inserted directly into the tool holder 11 of the drill hammer 10 or when working with a hit-and-shoot chuck fitted over it. is there. If the grip attached during normal operation of the drill hammer that does not use the attachment chuck can be attached to the fixed neck 40 in the same manner as described above when the attachment chuck is attached, the attachment chuck can be used in this manner. There are no restrictions on the work used. In this case as well, the grip can be fixed at any relative rotational position relative to the hitting / mounting chuck. Furthermore, advantageously, the overlaid hitting and mounting chuck is completely insulated, as is the tool holder 11 of the drill hammer 10 itself, so that no disadvantages arise here. Furthermore, the impact and mounting chuck is easy to operate, lightweight and inexpensive. Furthermore, the mounting chuck can be easily mounted on the tool holder of the drill hammer and detached again. In the fitted state, the hammering / mounting chuck is changed from a drill hammer to a pure sledge hammer. In this case, the rotary drive for the tool 31 is not performed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a hitting / mounting chuck,
FIG. 4 is a schematic axial sectional view of a front part of a drill hammer having a tool holder. 10 ... Drill hammer, 11,30 ... Tool holder, 12 ... Connection sleeve, 13 ... Striking mechanism, 14 ... Hollow piston, 15
…… Blower, 16 …… Middle striker, 17,47 …… Reception hole, 18,
43,44,48 …… Protrusion, 19… Tool holder neck, 20 …… Casing, 21,41,63 …… Outer surface, 22 …… Locking sleeve, 23,6
5 ... Dustproof cap, 31 ... Tool, 32 ... Shaft, 33,
57… axial groove, 34… locking groove, 35… tool receiving sleeve, 36… casing part, 37… cover-up part, 38
…… Vertical slit, 39 …… Clamping eye, 40 …… Fixed neck,
42 ... receiving part, 45, 46 ... recess, 49 ... opening, 50 ... locking body, 51 ... outer ring, 52 ... disk, 53 ... spring, 54
... rear part, 55 ... hitting pin, 56 ... connecting end, 58 ...
… Head part, 59 …… Guide hole, 60 …… Stoppering,
61 ... shoulder surface, 62 ... small diameter part, 64 ... locking sleeve.

Continuation of front page    (72) Inventor Wolfgang Schmied               Federal Republic of Germany               4. Reutecyutrasse 55 (72) Inventor Herbert Wiesner               Rheinfeldenbüh, Germany               Tusaltovake 7                (56) References JP-A-61-197170 (JP, A)                 JP-A-59-214571 (JP, A)                 JP-A-63-123679 (JP, A)

Claims (1)

(57) [Claims] Hand-held power machines that can be driven in rotation, especially impact mechanisms (1
A tool holder for connecting a tool to a drill hammer (10) having 3), wherein the tool holder has an inner tool receiving sleeve (35), wherein the tool holder has a separate impact. The chuck (30) is configured as a tool receiving sleeve (3
In 5), a striking pin (55) is arranged so as to be freely rotatable and reciprocally movable in the axial direction.
Is configured to engage in a tool holder (11) on the machine side of the hand-held power machine, and further, the tool receiving sleeve (35) is configured to rotate the casing (19, 20) of the hand-held power machine. A tool holder, characterized in that it can be connected in an impossible manner. 2. The casing part (36) that allows the impact / mounting chuck (30) to be fitted over the tool holder neck (19) on the machine side
And a rear portion (5) of the tool receiving sleeve (35).
4) A striking pin (55) is held in the striking pin (5).
5) is inserted into the tool receiving sleeve (12) of the machine-side tool holder (11) by a protruding connecting end (56), and when the tool is fitted over, 2. The tool holder according to claim 1, wherein the tool holder is receivably connectable within the tool receiving sleeve (12), such as a tool shaft inserted into the receiving sleeve. 3. 3. The connecting end (56) of the striking pin (55) is provided with at least one axial groove (57) open towards the end. Tool holder. 4. The striking pin (55) has a front head part (58) which is guided in a guide hole (59) in a rear part (54) of the tool receiving sleeve (35). 4. The method according to claim 1, wherein the guide hole is arranged coaxially with the tool receiving hole and is connected to the tool receiving hole. Tool holder. 5. A guide hole (59) for limiting the axial travel of the inserted tool (31) in at least one direction, in particular a stop surface cooperating with the associated surface (61, 63) of the head part (58). 5. The tool holder according to claim 4, comprising (60,62). 6. A stopper ring (60) is provided at the rear end of the guide hole (59), and the head portion (58) abuts in the axial direction by a shoulder surface (61) that protrudes radially from the stopper ring and prevents separation. The tool holder according to claim 5, wherein the tool holder is formed. 7. A tool receiving sleeve (35) has at least one radially inwardly projecting inwardly projecting, at the front portion, a receiving bore (47) for receiving the shaft (32) of the inserted tool (31). Having two locking bodies (50),
When the tool shaft (32) is inserted, it positively engages in closed axial locking grooves (34) on both sides of the tool shaft and allows at least limited axial relative movement The tool holder according to any one of claims 1 to 6, wherein the tool holder is used to generate a connection. 8. At least one locking body (50) consists of an axially spring-loaded sphere, said sphere comprising a tool receiving sleeve (3).
5) is movably held in a radial slit (49), and when the sphere is inserted with a tool shaft (32), it resists an axial spring force from the slit (49). The ball is pushed out, and then the ball is spring-loaded into the locking groove (34).
A tool holder according to claim 7, adapted to engage therein. 9. The tool receiving sleeve (35) has at least one projection (48) projecting inward in the radial direction, which projection, when the tool shaft (32) is inserted, is at the end of the tool shaft. 9. A tool holder according to claim 1, wherein the tool holder is adapted to positively engage in an axial groove (33) opened in the step (1). 10. 10. The tool holder according to claim 1, wherein the tool receiving sleeve (35) comprises a tubular metal member. 11. 11. The tool holder according to claim 1, wherein the tool receiving sleeve (35) is made of a hardened steel part. 12. The tool receiving sleeve (35) is
A tool holder according to any one of claims 1 to 11, wherein the tool holder is received and held in the front area of (6). 13. The casing part (36) has a substantially sleeve-shaped inner receiving part (42) in which at least the rear part (54) of the tool receiving sleeve (35) is received and axially and circumferentially. 13. The tool holder according to claim 1, wherein the tool holder is fixed in a direction. 14． The substantially sleeve-shaped receptacles (42) have radially inward projections (43, 4) projecting axially from one another.
4), wherein the projection has a tool receiving sleeve (35).
Engaging in recesses (45, 46) starting from the outer surface of
14. The tool holder according to claim 13, wherein: 15. The casing part (36) fits the tool receiving sleeve (3
At a distance in the axial direction from 5), a tubular cap-fitting part (37) that fits over the tool holder neck (19) on the machine side
The tool holder according to any one of claims 1 to 14, comprising: 16. 16. The tool holder according to claim 15, wherein the overfitting part (37) is fixedly fastened to the machine-side tool holder neck (19) by a fastening screw. 17． 7. The method according to claim 1, wherein the overfitting part has at least one longitudinal slit and a circumferential clamping eye which can be clamped together by a clamping screw. Item 16. The tool holder according to Item 15 or 16. 18. The casing part (36) is covered by the cover (37)
At an axial distance from the tool holder neck (1
18. The fixing device according to claim 1, further comprising a cylindrical fixing neck corresponding to the dimension of 9), to which a grip can be fixed with a clamping band. The tool holder according to any one of the preceding items. 19. A locking sleeve (64) is rotatably or movably held on the tool receiving sleeve (35) and / or the casing part (36), by means of which at least one locking body (50). Can be locked at one position of the locking sleeve (64) and releasable at a position offset from this position to unlock the inserted tool (31). Item 19. The tool holder according to any one of Items 1 to 18. 20. 20. The tool holder according to claim 1, wherein a dustproof cap (65) is provided at a front end of the tool receiving sleeve (35). 21. 21. Tool holder according to claim 1, wherein the housing part (36) and / or the locking sleeve (64) and / or the dust-proof cap (65) are made of plastic. .