JP2005538859A - Tool receiving part - Google Patents

Abstract

The present invention is a tool receiver, in particular for a hammer drill or chipping hammer, comprising a receiver (14) with an insertion opening (16) for receiving a tool shaft (12), and an insertion opening (16). A locking member (22) for axially locking the tool shaft (12), the locking member (22) being movable between a locked position and an unlocked position, Further, a locking pin (36) supported in the lock member (22) and capable of sliding in the radial direction between the lock position and the release position is provided, and the lock pin (36) is provided. The present invention relates to a tool receiving portion that is adapted to lock the locking member (22) in the axial direction at the locking position and to release in the axial direction at the releasing position.

Description

  The invention relates to a tool receiving part, in particular for a hammer drill or a chipping hammer, as described in the superordinate concept part of claim 1.

  According to German Offenlegungsschrift 100 26021, a tool receiving part for a drill bit is known which can be operated with one hand during tool change. For this purpose, the tool receiving part has a receiving body with an insertion opening, into which the tool shaft can be inserted in the axial direction. With the tool inserted, the tool shaft is locked axially by the locking body, with the locking body engaging in an axially extending groove formed in the tool shaft, thereby The tool shaft has a predetermined play space in the axial direction in the locked state. In this case, the axially slidable lock sleeve prevents the lock body from moving in the radial direction when the lock sleeve is in the locked position. In contrast, when the locking sleeve is slid by the user to the unlocked position, the locking body is displaced radially outward and the drill bit is removed from the tool receptacle or inserted into the tool receptacle. It has come to be. At this time, in order to prevent the drill bit from being unexpectedly unlocked, the locking sleeve is preloaded by the spring towards the locked position. However, in order to allow one-handed operation, the locking sleeve is axially locked in the unlocked position, this locking being effected, for example, by a leaf spring that locks into the locking sleeve from the inside. ing.

Advantages of the Invention In contrast, according to the present invention, a tool receptacle is provided in which the mechanism for locking the lock sleeve is simple and robust.

  For this purpose, a locking pin is supported on the locking member which is advantageously configured in the form of a sleeve, which locking pin is radial in relation to the insertion opening, between the locking position and the release position. It can be moved.

  In the locking position of the locking pin, the locking member is locked in the unlocked position so that the tool shaft can be inserted into the tool receiver or the tool receiving without the user having to lock the locking member. It comes to be taken out from the department.

  On the other hand, in the release position of the locking pin, the locking member is not locked in the unlocked position, whereby the tool shaft is locked axially in the tool receiving part.

  In an advantageous embodiment of the invention, a spring member is provided for applying a preload in the direction towards the locking position to the locking pin, in which case the locking pin is a shaft in the receptacle in the locking position. Abuts the direction stopper. The locking pin then automatically slides into the locking position in an advantageous manner based on the spring preload when the user moves the locking member from the locked position to the unlocked position, in this case locking the locking member There is no need for the user to perform any operation to lock in the release position, which greatly simplifies the operation.

  In order to further simplify the operation, advantageously, the locking of the locking member can likewise be released without requiring a user operation. Thus, in an advantageous embodiment, the locking pin can be released from the locked position by the tool shaft. In an advantageous manner, this unlocking is achieved when the movement of the tool shaft is transmitted to the locking pin when it is removed from the tool receiving part or inserted into the tool receiving part, thereby locking the locking pin. This is done by releasing from the position.

  In this case, in order to transmit the force from the tool shaft to the locking pin, for example, a spherical transmission member is provided in an advantageous manner and this transmission member projects radially into the insertion opening of the tool receiving part. When the tool shaft is inserted or removed, the tool shaft is slid outward in the radial direction, and at this time, the locking pin is pushed outward in the radial direction.

  In an advantageous manner, the transmission member is designed as a sphere, which is supported in a radially slidable manner in the bore of the receiver. In this case, the through hole tapers inward in the radial direction so that the ball does not slip inward when the tool shaft is in the tool receiving part.

  The concept of the locking member used within the framework of the present invention is general and is limited to an axially slidable locking sleeve of the type described at the outset, which envelops the receiver. It is not something.

  In an advantageous manner, a spring member is provided which preloads the locking member in the locked position in order to prevent the tool shaft from being unlocked unexpectedly.

  The sliding movement of the locking member is effected, for example, by the user operating the locking member directly, as in a known tool receiving part of the type mentioned at the beginning.

  However, in an advantageous embodiment, a separate operating member is provided, which is configured as an operating sleeve and encloses the locking member in an advantageous manner in the form of a mantle. The operating member can be slid axially in an advantageous manner and is preloaded in the axial direction by a spring member for fixing in a non-working position. As a result, the movement of the operating member is transmitted to the locking member, which is performed, for example, by the operating member entraining the locking member. However, alternatively, the operating member may be rigidly or elastically connected to the locking member in order to transmit the movement of the operating member to the locking member.

  The original locking of the tool shaft in the tool receiving part is effected by a locking body which engages in the corresponding groove of the tool shaft, as in the known tool receiving part mentioned at the beginning. In an advantageous manner, however, a highly wear-resistant locking roller which can be slid radially is used to lock the tool shaft.

  Furthermore, the present invention relates to a machine tool provided with the tool receiving portion according to the present invention, such as a hammer drill or a chipping hammer.

Drawings Other advantages of the present invention are described below using the illustrated embodiments.

  The drawings, description and claims have many combinations of features. Those skilled in the art can consider these features as separate and can also be combined in other advantageous combinations.

FIG. 1 is a cross-sectional view of a tool receiving part according to the invention in a locked position when inserting a tool shaft
2 is a cross-sectional view of the tool receiver shown in FIG. 1 in a locked position with an inserted tool shaft;
FIG. 3 is a cross-sectional view of the tool receiving portion shown in FIG. 1 in the locked position when the tool shaft is removed;
FIG. 4a is a cross-sectional view showing details of the tool receiver shown in FIG.
FIG. 4b is a view of the detailed view shown in FIG.
FIG. 5 is an alternative embodiment of a tool receptacle according to the present invention.

DESCRIPTION OF THE EMBODIMENTS The cross-sectional views of FIGS. 1-3 show a tool receptacle 10 for a hammer drill or chipping hammer, in which case the tool receptacle 10 has a tool shaft with a predetermined axial movement play. This enables a simple one-handed operation when changing the tool's axial direction.

  For this purpose, the tool receiving part has a substantially hollow cylindrical receiver 14 with an insertion opening 16 into which the tool shaft 12 is inserted in the axial direction.

  A plurality of through holes distributed in the circumferential direction are provided in the receiver 14, and one lock roller 18 is arranged in each of these through holes. These through holes taper inward in the radial direction to prevent the lock roller 18 from sliding inward.

  In order to lock the tool shaft 12 in the axial direction, the lock roller 18 engages in an axially extending groove 20 formed in the outer peripheral surface of the tool shaft 12, whereby the tool shaft 12 is engaged with a predetermined axis. It is locked with walking.

  Furthermore, the tool receiving part 10 has locking sleeves 22 and 22 'which slide in the axial direction between the locking position shown in FIG. 2 and the unlocking position shown in FIG. Is possible.

  In the locked position shown in FIG. 2, the locking sleeve 22 covers the through-hole of the receiver 14, thereby preventing the locking roller 18 from moving out in the radial direction and thus preventing the tool shaft 12 from being removed. .

  On the other hand, in the unlocked position shown in FIGS. 1 and 3, the through hole formed in the receiver 14 is covered by an elastic Manschette (Manshette: seal sleeve) 26. The lock sleeve 22 is attached to the inside of the stepped widened portion. Thus, the lock roller 18 can be elastically displaced radially outward so that the tool shaft 12 can be removed from the tool receptacle 10 or inserted into the tool receptacle 10.

  In this case, the lock sleeve 22 is preloaded (preloaded) in the direction of the lock position by the spring member 24 in order to prevent the tool shaft 12 from being unlocked unexpectedly.

  The operation of the tool receiving portion 10 is performed by the operation sleeve 28. The operating sleeve 28 surrounds the outside of the lock sleeve 22 and can slide in the axial direction. In this case, the operating sleeve 28 is preloaded in the axial direction by a spring member 30. When the operation sleeve 28 is slid in the direction toward the lock sleeve 22, the operation sleeve 28 collides with the lock sleeve 22, and at this time, the lock sleeve 22 is entrained in the axial direction.

  Furthermore, the tool receiving portion 10 has a ring-shaped elastic dust intrusion prevention seal cap 32, and the dust intrusion prevention seal cap 32 prevents dust from entering the insertion opening 16.

  Furthermore, the tool receiving portion 10 has a locking mechanism that locks the lock sleeve 22 in the unlocked position, thereby enabling one-handed operation when changing the tool.

  The locking mechanism consists in particular of a steel ball 34 which is supported in a radially slidable manner in a radially extending through hole 35 formed in the receiver 14. In this case, the through-hole 35 of the receiver 14 tapers inward in the radial direction, thereby preventing the sphere 34 from sliding down from the through-hole 35 into the insertion opening 16. The sphere 34 partially protrudes into the insertion opening 16 as shown in FIG.

  Further, the locking mechanism has a locking pin 36, and this locking pin 36 is supported so as to be slidable in the radial direction in a hole extending in the radial direction in the lock sleeve 22. The locking pin 36 is preloaded in the radial direction by a ring spring 38.

  The locking pin 36 is guided in two grooves 40 and 42 extending in the axial direction. These grooves 40, 42 are arranged on the outer peripheral surface of the receiver 14 on both sides of the through-hole 35 for the sphere 34, and the workpiece-side groove 40 has a groove depth smaller than the tool-side groove 42. have. Therefore, in the unlocking position shown in FIG. 1, the locking pin 36 abuts against the step portion between the two grooves 40 and 42 in the axial direction, whereby the lock sleeve 22 is locked in the axial direction.

  In the following, how the tool shaft 12 is inserted into the tool receiving part 10 and then automatically locked is described with reference to FIG.

  Prior to inserting the tool shaft 12, the locking sleeve 22 must first be brought into the unlocked position shown in FIG. For this purpose, the user slides the operating sleeve 28 toward the lock sleeve 22. At this time, the locking sleeve 22 is pivoted until the locking pin 36 is finally locked behind the step between the two grooves 40 and 42, thereby locking the locking sleeve 22 in the axial direction. Entrained in the direction.

  Next, when the user releases (relaxes) the operation sleeve 28, the operation sleeve 28 moves back to its initial position based on the preload of the spring 30.

  When the tool shaft 12 is inserted axially into the insertion opening 16, the tool shaft 12 pushes the lock roller 18 radially outward until the lock roller 18 engages in the groove 20 of the tool shaft 12. do.

  When the tool shaft 12 is further inserted, the end face side of the tool shaft 12 pushes the sphere 34 outward in the radial direction, and at this time, the locking pin 36 similarly resists the preload of the ring spring 38 in the radial direction. Pushed outward.

  Then, when the locking pin 36 is lifted beyond the step between the two grooves 40, 42, the spring 34 causes the locking sleeve 22 to slide axially to the locked position shown in FIG. The stop pin 36 is guided in the groove 40. Then, in the locked position, the locking sleeve 22 covers the through hole for the locking roller 18 by its inner side, so that the locking roller 18 can no longer be displaced radially outwards and the tool The shaft 12 is locked in the axial direction with a predetermined movement play space.

  That is, when the tool shaft 12 is inserted into the tool receiving portion 10, it is automatically locked without requiring any user operation.

  The operation for taking out the tool shaft 12 from the tool receiving portion 10 will be described below with reference to FIG.

  Before removing the tool shaft 12 from the tool receiving part 10, it is first necessary to bring the lock sleeve 12 from the locked position shown in FIG. 2 to the unlocked position shown in FIG. For this purpose, the user slides the operation sleeve 28 in the axial direction from the position shown in FIG. 1 toward the lock sleeve 22, and at this time, the operation sleeve 28 has the lock pin 36 in the groove 42. The locking sleeve 22 is axially entrained until it is behind the sphere 34 on the side and abuts the sphere 34.

  The user then releases the operating sleeve 28, which then moves back to its initial position based on the return force of the spring 30.

  The lock sleeve 22 is then locked in the axial direction by a ball 34 and a lock pin 36. This is because the lock pin 36 is in contact with the sphere 34 on the side, and the sphere 34 is pushed outward by the outer peripheral surface of the rear shaft 12. In this case, the groove 20 for the lock roller 18 does not have a portion in which the ball 34 is disposed in the circumferential direction. That is, the sphere 34 cannot be displaced into the groove 20 inward. This is because the groove 20 is arranged at an angle with respect to the sphere 34.

  The user can withdraw the tool shaft 12 axially from the tool receptacle 10 until the tool shaft 12 releases the sphere 34 and the sphere 34 is displaced radially inward. The lock pin 36 is then no longer blocked by the ball 34 so that the lock sleeve 22 moves to a locked position not shown in FIG.

  The embodiment of the tool receiving portion 10 'according to the present invention shown in FIG. 5 is the same as the embodiment of the tool receiving portion 10, so that the above description will be referred to and distinguished in order to avoid repeated description. In addition, corresponding components are marked with a dash (') in the same reference numerals as described above.

  This embodiment is characterized in that the spring 30 provided in the embodiment shown in FIGS. 1 to 3 for resetting the operation sleeve 28 is omitted.

  Instead, in this embodiment, the operating sleeve 28 'is firmly connected to the lock sleeve 22', so that the operating sleeve 28 'and the lock sleeve 22' can be moved together.

  The present invention is not limited to the above embodiments. Rather, many variations and modifications are possible which likewise utilize the inventive concept and are therefore to be protected by the present invention.

FIG. 6 is a cross-sectional view of the tool receiving portion according to the present invention in a locked position when inserting a tool shaft. FIG. 2 is a cross-sectional view of the tool receiver shown in FIG. 1 in a locked position with an inserted tool shaft. FIG. 2 is a cross-sectional view of the tool receiving portion shown in FIG. 1 in a locked position when taking out the tool shaft. 4a is a cross-sectional view showing details of the tool receiving portion shown in FIG. 1, and FIG. 4b is a view of the detailed view shown in FIG. 4a seen in the radial direction. FIG. 6 is a cross-sectional view illustrating a selective embodiment of a tool receiving portion according to the present invention.

Explanation of symbols

  10, 10 'tool receiving part, 12, 12' tool shaft, 14, 14 'receiver, 16, 16' insertion opening, 18, 18 'locking roller, 20, 20' groove, 22, 22 'locking sleeve, 24 , 24 'spring, 26, 26' manchette, 28, 28 'operation case, 30 spring, 32, 32' dust entry prevention seal cap, 34, 34 'sphere, 35 through hole, 36, 36' locking pin, 38 , 38 'Ring spring, 40 grooves, 42 grooves

Claims (12)

A tool receiver, in particular for a hammer drill or chipping hammer, comprising a receiver (14) with an insertion opening (16) for receiving a tool shaft (12), and a tool shaft in the insertion opening (16) A locking member (22) for locking (12) in the axial direction, wherein the locking member (22) is movable between a locked position and an unlocked position;
A locking pin (36) is provided which is supported in the locking member (22) and is radially slidable between a locking position and a releasing position, the locking pin (36) being A tool receiving portion characterized in that the locking member (22) is locked in the axial direction at its locking position and released in the axial direction at its release position.   The locking pin (36) is provided with a first spring member (38) that preloads toward the locking position, and this locking pin (36) is in the locking position at the shaft of the receiver (14). The tool receiving portion according to claim 1, wherein the tool receiving portion is adapted to abut against a directional stopper.   3. A tool receptacle according to claim 2, wherein the locking pin (36) is released from the locked position by the tool shaft (12).   A transmission member (34) for releasing the locking pin (16) from the locking position, which is slidably supported in the radial direction in the receiver (14), is provided, the transmission member (34). 4. The tool receptacle according to claim 3, wherein the tool receiver is slidable radially outwardly by the tool shaft (12) toward the locking pin (36).   The tool receiving portion according to claim 4, wherein the transmission member is a sphere.   The tool receiving part according to any one of claims 1 to 5, wherein the locking member (22) is formed in a sleeve shape.   The tool receiving part according to any one of claims 1 to 6, wherein the lock member (22) is provided with a second spring member (24) for preloading in the axial direction toward the lock position.   The tool receiving part according to any one of claims 1 to 7, further comprising an axially slidable operating member (28) for sliding the locking member (22) in the axial direction.   The tool receiving part according to claim 8, wherein the operating member (28) is provided with a third spring member (30) for preloading in the axial direction.   10. Tool receiving part according to claim 8 and / or 9, wherein the operating member (28) is configured in the form of a sleeve and at least partially surrounds the locking member (22).   Arranged in the receiver (14) is a radially slidable locking roller (18) for axially locking the tool (14), which lock roller locks the locking member (22). 11. A tool receptacle according to any one of the preceding claims, which engages in a groove (20) in the tool shaft (12) in position.   Machine tool, in particular a hammer drill or chipping hammer, having a tool receiving part (10) according to any one of claims 1 to 11.

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