JPH1058352A - Tool holder change device for hand-held machine tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tool holder allowing easy detachment from a hand-held machine tool, particularly a hammer drill or an impact type hammer. SOLUTION: A hammer drill 10 has a spindle sleeve 18 projected from a machine casing 19. Also, the adapter 24 of a tool holder can be inserted in the spindle sleeve 18 and fixed with a locking member 28. In addition, the locking member 28 is radially covered with a fixing member 29 axially movable on the manipulation of an operation sleeve 33. Also, the fixing member 29 and the operation sleeve 33 are supported on the adapter 24, so as to be capable of axially moving in a direction relative to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a hand-held machine tool,
A tool holder changer, especially in a hammer drill and / or impact hammer, having a tool holder releasably connectable to a spindle sleeve of a hand-held machine tool by an adapter, comprising a recess in the adapter and a corresponding recess in the spindle sleeve. At least one locking member is provided which is radially engaged with the locking member and which can be fixed in the engaged state in the radial direction by a fixing member, which is used for unlocking the tool holder. At least one locking member can be brought into a position for radial release by an operating sleeve.

[0002]

2. Description of the Related Art Such switching devices are already known (EP-A-556713).
issue). This known changer has a tool holder adapter which can be inserted into the spindle sleeve of a hammer drill and can be fixed there axially and circumferentially by a locking sphere. When locking the adapter to the hand-held machine tool, the locking sphere fits into the corresponding recesses of the adapter and the spindle sleeve and is radially blocked at this position by the fixing member. The locking member can be moved axially by the operating sleeve to release the locking sphere radially. The operating sleeve is held on a hand-held machine tool so that it can move to some extent in the axial direction.
In order to unlock the tool holder, the operating sleeve must be moved rearward, that is, axially in the direction towards the machine, so that the machine neck (the narrow end of the machine body to which the tool holder adapter is attached) is It becomes longer by the corresponding travel distance.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a hand-held machine tool having a compact structure with a correspondingly short machine neck.

[0004]

In order to solve this problem, according to the present invention, the operating sleeve is held by the adapter so that it can move in the axial direction together with the fixing member.

[0005]

BRIEF DESCRIPTION OF THE DRAWINGS Preferred embodiments of the invention are described in the dependent claims. In particular, it is advantageous if the spindle sleeve engages between the adapter and the fixing element, so that at least one locking element is arranged radially movable in the spindle sleeve. This is because this enables automatic locking of the tool holder and the hand-held machine tool, and the operator does not have to manually unlock the fixing member. If the unlocking direction of the operating sleeve is made to coincide with the direction in which the tool or the adapter is removed from the hand-held machine tool, "one-hand operation" becomes possible, and particularly, the exchange of the tool holder becomes easier.
It is also advantageous for the fixing member to be able to move axially relative to the operating sleeve. This is because, in this case, the operating sleeve maintains its axial position when the adapter is fitted and locked. By loading the locking element in the locking direction with a spring element, the locking element can be automatically returned after the adapter has been inserted into the spindle sleeve. A stop provided on the actuating sleeve also allows the locking member to be entrained and the actuating sleeve to be returned by the spring element. It is also very advantageous to provide a separate means for rotational entrainment of the tool holder. This is because these measures make it possible to transmit the torque independently of the locking member and also simplify the mounting of the tool holder on the hand-held machine tool.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows a tool holder 21a (2 in FIG. 3).
The front part of a hammer drill 10 is shown as an example of a hand-held machine tool provided with an exchange device 9 according to the invention for exchanging 1b). The hammer drill 10 has a hammer pipe 11 rotatably supported on a machine casing 19 of the hammer drill 10 via a bearing 11a. A hollow piston 12 is guided in the hammer pipe 11 so as to be movable in the axial direction. The hollow piston 12 contains a striking member 13. The striking member 13 is a hammer drill 1
At the time of the hitting operation of 0, an axial impact is applied to the tool shaft 15 indicated by a broken line in FIGS.

The hammer pipe 11 can be driven to rotate by a drive motor (not shown) through a gear 16 of a transmission (not shown). A spindle sleeve 18 is fixed to the tool side end 17 of the hammer pipe 11 in the axial direction and held in the hammer pipe 11 so as not to rotate. On the side facing the tool shaft 15, the spindle sleeve 18 forms a holding part 20 of the adapter 24, on which a tool holder 21a is fixed. The tool holder 21a has a base 22. On the one hand, the base 22 forms a holding opening 23 for the tool shaft 15, and on the other hand, an adapter 24 is integrally formed with the base 22 (FIGS. 1 and 2). However, the adapter 24 may be formed separately and detachably connected to the base 22 of the tool holder 21b (FIG. 3).

The outer diameter of the tubular adapter 24 is substantially equal to the inner diameter of the holding portion 20 in the spindle sleeve 18. At least one through hole 27 is formed in the tool side portion of the spindle sleeve 18. In the illustrated embodiment, two through holes 27 are formed in the spindle sleeve (guide pipe) 18 so as to face each other. Through hole 27
Inside, a sphere 28 is arranged as a lock member.

The sphere 28 is in the locked position shown in FIG.
The annular fixing member 29 radially engages and holds the concave portion 30 on the outer periphery of the adapter 24.
The through-hole 27 and the recess 30 form corresponding recesses for the form engagement between the adapter 24 and the spindle sleeve 18. In the embodiment shown, the recess 30 is formed as a full circumferential groove, so that when the sphere 28 is fitted into the recess 30, the adapter 24 is axially fixed in the spindle sleeve 18.

The fixing member 29 is surrounded by an operation sleeve 33 and is held so as to be movable in the axial direction. The actuating sleeve 33 itself can be moved through the adapter 24 via a stop ring 35 so that it can move to some extent in the axial direction.
Is held in. The fixing member 29 is axially loaded towards its locking position by a spring element 34 formed as a conical coil spring. In this case, the spring element 34 is supported on the one hand by a stop ring 35 and on the other hand by a fixing element 29. The stop ring 35 is axially fixed to the adapter 24 between the step portion 36a and the fixing ring 36b.

A fixing ring 37 is seated in the groove of the operating sleeve 33 and serves as a stopper for the fixing member 29. When the fixing member 29 is in contact with the fixing ring 37, the initial spring force of the spring 34 is transmitted to the operation sleeve 33. The operation sleeve 33 has a projection 38 protruding inward on the opposite side of the impact ring 35 from the hammer drill 10. This projection 38 is in positive engagement with the rear side of the stop ring 35, thereby forming a travel stop which prevents the operating sleeve 33 from coming off the adapter 24.

[0013] In the area of the machine end 40 of the adapter 24, teeth 41 are provided, and in the spindle sleeve 18 corresponding teeth 42 are provided, which are located in the spindle sleeve 18. When the adapter 24 is inserted into the tool holder 21, it functions to transmit torque to the tool holder 21.

The tool holder 21 for holding a tool having the tool shaft 15 shown in FIGS. 1 and 2 has a moving sleeve 44 serving to unlock the tool shaft 15. The moving sleeve 44 is loaded axially forward by a compression spring 45. The operation sleeve 33 and the moving sleeve 44 can be fitted to each other and move relative to each other.

FIG. 2 shows a state where the tool holder 21a is removed from the hammer drill 10. In this position, the locking member 28 is held inward by a suitable taper of the through hole 27 and outwardly the ring 2.
7a. In this case, the ring 27a partially covers the opening cross section of the through hole 27 in the radial direction.

In order to attach the tool holder 21 to the hammer drill 10, the end 40 of the adapter 24 is inserted into the holding portion 20 until the teeth 41 hit the corresponding teeth 42. At this time, the lock member 28 is pushed out to the outer position shown by the broken line. Here, when the tool holder 21 is rotated with respect to the guide pipe 18 until the teeth of the tooth portions 41 and 42 face the tooth grooves, the adapter 24 can be further inserted into the spindle sleeve 18 in the axial direction. At this time, the tool end of the spindle sleeve 18 is connected to the adapter 2
4 and the fixing member 29 are engaged in the axial direction. Until then, the operator does not need to overcome the additional stress. This allows the adapter 24 and the spindle sleeve 18
It is easy to find the correct rotation position with respect to.

Since the locking member 28 protrudes radially outward from the outer periphery of the spindle sleeve 18, when it is further inserted, the fixing member 29 moves axially against the force of the spring element 34. Since the fixing member 29 can move with respect to the operation sleeve 33, the operation sleeve 33 remains at the initial position. As soon as the recess 30 and the through-hole 27 overlap in the radial direction, the spring element 34 pushes out the fixing member 29, which pushes out the locking member 28, so that the sphere 28 is 30 and engages in shape. With this configuration, automatic locking of the tool holder 21 in the hammer drill 10 is guaranteed. Therefore, it is not necessary to operate the operation sleeve 33. In this case, the initial spring force of the spring element 34 allows the user to hear the sound of the locking member 28 being fitted into the concave portion 30, so that the operator can recognize that the tool holder 21 has been locked correctly.

In order to remove the tool holder 21 from the position shown in FIG. 1, the operating sleeve 33 is moved forward in the axial direction. At this time, the fixing member 29 is moved together in the axial direction by the fixing ring 37. As soon as the fixing member 29 releases the through hole 27 in the radial direction, the locking member 2
8 can emerge radially outward from the recess 30. As a result, the tool holder 21 is released and can be removed from the spindle sleeve 18.

In FIG. 3, a hammer drill 10 is provided with a drill chuck as a tool holder 21b. In this case, the connection means between the tool holder 21b and the hammer drill 10 corresponds to the connection means already described in connection with FIGS. In the embodiment of FIG. 3, the adapter 24 and the base body 22 are formed separately and are detachably screwed to each other by a thread 50. Further, a set screw 25 is provided so as not to come off when rotated to the left.

The tool holder 21 shown in FIG. 3 is unlocked by moving the operating sleeve 33 forward in the axial direction in the same way and can be removed after the locking member 28 comes off the recess 30.

The present invention is not limited to the embodiment shown here. For example, the spindle sleeve 18 and the hammer pipe 11 can be integrally formed. Furthermore, instead of the annular recess 30 into which the at least one locking member 28 fits, at least one circumferentially restricted recess, for example several crown recesses, is provided and through these crown recesses. It is also possible to transmit torque. In this case, the teeth 41 and 42 for transmitting the torque become unnecessary.

[0022]

As described above, according to the present invention, the machine neck of the hand-held machine tool can be shortened, the structure of the hand-held machine tool can be made compact, and the tool holder can be easily attached and detached. it can.

[Brief description of the drawings]

FIG. 1 is a sectional view of a front portion of a hammer drill to which a tool holder for holding a drill shaft is attached.

2 is a sectional view of the hammer drill according to FIG. 1 with the tool holder removed.

FIG. 3 is a sectional view of a hammer drill to which a drill chuck is attached.

[Explanation of symbols]

Reference Signs List 9 exchange device, 10 hammer drill (hand-held machine tool), 11 hammer pipe, 11a bearing, 12
Hollow piston, 13 hitting member, 14 hitting body,
15 tool shaft, 16 gears, 17 tool end, 18 spindle sleeve (guide pipe),
19 machine casing, 20 holder, 21 (21a
And 21b) tool holder, 22 base, 23 holding opening, 24 adapter, 25 set screw, 2
7 through-hole (recess), 27a ring, 28 sphere (locking member), 29 fixing member, 30 recess, 33
Operating sleeve, 34 spring element, 35 stop ring (spacer), 36a step, 36b fixing ring,
37 fixing ring (stopper), 38 projection, 4
0 machine side end, 41 and 42 teeth, 44 moving sleeve, 45 compression spring, 50 thread, 53
Protrusion

Continued on the front page (72) Inventor Otto Baumann Germany Reinfelden-E Hitterdingen Weingartenstraße 24 (72) Inventor Ulrich Bone Germany Kohlberg Zoller Lunstraße 24 (72) Inventor Rolf Muller Germany Federal Republic Rheinfelden-E Hitterdingen Manosväuststraße 76 (72) Inventor Dietmar Sauer Germany Messingen Blue Menkuche 5 (72) Inventor Eegbert Schneider Freiberg Grader-Adermann-Strasse 29 Germany

Claims (11)

[Claims] An apparatus for exchanging a tool holder in a hand-held machine tool, in particular a hammer drill and / or impact hammer, comprising:
And a tool holder (21) detachably connected to the spindle sleeve (18) of the adapter (2).
4) and at least one locking member (28) radially engaging with the recess (30) of the spindle sleeve (18) and the corresponding recess (27, 30) of the spindle sleeve (18). (28) can be fixed in the radial direction by the fixing member (29) in the engaged state, and the fixing member (2)
9) At least one locking member (28) by means of the operating sleeve (33) for unlocking the tool holder (21).
Can be brought into a radially releasing position, the operating sleeve (33) is provided with a fixing member (2).
Adapter (2) so that it can move in the axial direction together with 9)
A tool holder changing device for a hand-held machine tool, which is held in 4). 2. A spindle sleeve (18) configured to engage between an adapter (24) and a securing member (29), wherein at least one locking member (28) is
2. The device as claimed in claim 1, further comprising a radially movably disposed bore formed in the spindle sleeve. 3. The operating sleeve or the fixing member (29).
3. The device as claimed in claim 1, wherein the unlocking direction corresponds to the direction in which the adapter is removed from the spindle sleeve. 4. An operating sleeve (3) comprising a fixing member (29).
4. The device according to claim 1, wherein the device is movable axially relative to 3) and is loaded by a spring element. 5. The device according to claim 4, wherein the fixing member is loaded by a spring element against a stop provided on the operating sleeve. 6. An adapter (24) comprising a tool holder (21).
6. The device according to claim 1, which is part of a substrate (22). 7. The tool holder (21) wherein said adapter (24) is a tool holder (21).
6. The device as claimed in claim 1, wherein the device is detachably connected to a base of the device. 8. The operating sleeve (33) includes a spacer (3).
8. The device according to claim 6, wherein the spacer is held radially by 5) and the spacer is fixed axially to the base body or the adapter. 9. The operating sleeve (3) is provided with a spacer (35).
Forming an axial stop (38) for 3),
An apparatus according to claim 8. 10. A tooth (41) for rotating a tool holder (21) is provided between a recess (30) of the adapter (24) and an end (40) of the adapter (24). Device according to any one of the preceding claims. 11. The operating sleeve (33) comprises an adapter (2).
The axial projection (5) surrounding the machine side end (40) of (4)
3), and the projections (53) are provided on the hand-held machine tool (1).
2. A part of a machine casing (19) of a hand-held machine tool when an adapter (24) is attached to said (0).
The device according to any one of claims 1 to 10.