EP2081715A1

EP2081715A1 - Re-tightening drill chuck

Info

Publication number: EP2081715A1
Application number: EP07817659A
Authority: EP
Inventors: Hans-Dieter Mack
Original assignee: Roehm GmbH Darmstadt
Current assignee: Roehm GmbH Darmstadt
Priority date: 2006-10-28
Filing date: 2007-10-13
Publication date: 2009-07-29
Also published as: JP2010508156A; CN101370607A; DE102006050916A1; CN101370607B; US20100207336A1; US8262096B2; DE112007003237A5; WO2008052507A1

Abstract

The invention relates to a re-tightening drill chuck with a chuck body (1), a clamping cone (2) which can rotate coaxially with respect to the chuck body (1) and is axially supported on a jaw holder (3), which is mounted on the chuck body (1) and in which clamping jaws (4) are guided in guiding slots and are adjustable for clamping and release by relative rotation between the chuck body (1) and the clamping cone (2) with the jaw holder, wherein a stop is formed on the jaw holder (3) and a counter-stop (11) is formed on the clamping cone (2) for the defined delimitation of a relative rotatability of the clamping cone (2) with respect to the jaw holder (3) between a first rotational position and a second rotational position. A snap-in locking device (12), which has a snap-in element (26) and a snap-in location (13) respectively assigned to the first rotational position and the second rotational position, is arranged between the jaw holder (3) and the clamping cone (2). Rotatably arranged on the chuck body (1) is a gripping sleeve (5), arranged in which is a locking slide (6), which is adjusted from a position in which it is disengaged from a first toothed ring (7) assigned to the chuck body (1) into a position in which it is engaged when a change takes place between the second rotational position and the first rotational position, and vice versa. A stop (8) is provided for delimiting the relative rotatability of the gripping sleeve (5) with respect to the jaw holder (3) in the sense of re-tightening.

Description

Resting drill chuck

The invention relates to a chucking chuck with a chuck body, a coaxial with the chuck body rotatable clamping cone, axially supported on a chuck body mounted on the jaw holder, are guided in the guide slots clamping jaws, for clamping and releasing by a relative rotation between the Futterköiper and the

Clamping cone with the jaw holder are adjustable, wherein on the jaw holder a stop and on the clamping cone a counter-stop for defined limitation of a relative rotatability of the clamping cone relative to the jaw holder between a first, and a second, rotational position is formed, and wherein a locking member having a locking device one of the first rotational position associated and one of the second rotational position associated latching seat between the jaw holder and the clamping cone is arranged.

Such a chuck is known from German patent application DE 102006024 819.8, which has not been previously published, and which has restoring properties and so on in E3ohibetrieb ensures the secure clamping of the drilling tool, even if, for example, dig during a Schlagbohreinsatzes the clamping edges of the clamping jaws in the tool shank. However, it is problematic when drilling very powerful drills with large Bohrdurchmessem, since there is a risk that the post-tension is so effective that the chuck can only be opened with great difficulty or without tools.

The invention is therefore based on the object, a chucking drill chuck of the type mentioned in such a way that for the tool change a safe opening of the drill chuck is guaranteed.

This object is achieved according to the invention in a chuck of the type mentioned above, that on the chuck body, a grip sleeve is rotatably mounted in a gate valve is arranged, which in a change between the second rotational position and the first rotational position of a disengaged from a Chuck body associated first gear ring located in an engaged position is adjusted, and vice versa, and that a stop for limiting the relative rotatability of the grip sleeve against the jaw holder is provided in the sense of a re-tensioning. This chuck is characterized in that a Nachspannbegrenzung is effective, which is forcibly activated by the user when clamping a drill shank, without the user being aware of this and he has to perform additional manipulations. By the inventively provided locking slide, the rotatable mounting of the grip sleeve relative to the chuck body is stopped when the change of the locking device between the second and the first rotational position takes place, so that an adjustment of the jaw holder relative to the grip sleeve only so far is possible until the stop for Plant comes.

It is useful in the context of the invention, when the clamping cone and / or the Jaw holder has a control cam for the radial adjustment of the locking slide, since its secure adjustment for engagement in the Speπverzahnung the first sprocket can be done. In this position, the locking slide is acted upon by a spring, which facilitates its insertion into the first ring gear. The backup of the 5 engagement can be done by the control cam and / or a bead formed on the release ring. It is preferred in this case if the cam is formed on a rotatably connected to the clamping cone control sleeve as an axially projecting sleeve collar which engages in a transverse slot of the locking slide, so as a secure adjustment of the locking slide in both directions directed radially inward and radially directed away can be.

Moreover, in view of the simplicity of construction of the drill chuck, it is favorable if the stop is formed by a pin arranged on the jaw holder, which engages in a circumferentially extending slot formed in the grip sleeve. By extending the slot then there is the possibility to influence the extent of the post-tension. It then makes sense that the slot is over an angle of 12 °

15 to 36 °, preferably of 24 °, since this arc sufficient

Provides Nachspanneigenschaft without allowing too tight clamping of the drilling tool.

This always the full Nachspannweg is available at the beginning of clamping a drilling tool, a return spring 20 is disposed between the grip sleeve and the jaw holder.

A very preferred embodiment of the invention is characterized by a Vemegelungseinrichtung having a coaxial to the chuck axis second sprocket on the one hand and under the force of a spring in the second sprocket engaging, mounted on the jaw holder pawl on the other hand and the chuck body and the SperrWinke when engaged in the second sprocket SpeπWinke against relative rotation in the sense of loosening the jaws locks, relative rotations in terms of clamping but unhindered leaves, the first rotational position of the engaged state and the second rotational position of the disengaged state of SperrWinke compared to the second sprocket corresponds to this embodiment is characterized by the fact that through the

Nachspannbegrenzung not only an excessive adjustment of the clamping cone relative to the chuck body in the closing corresponding rotation is prevented but that an opening of the drill chuck in drilling operation due to the vibrations occurring is prevented. In this embodiment of the drill chuck the already present locking device is utilized for the locking device to selectively adjust the clamping cone between the two rotational positions, which are connected to the engaged and the disengaged state of the pawl.

This then gives rise to the possibility that the clamping cone has a second control cam for adjusting the pawl from the engaged position in the sprocket in the disengaged position upon rotation of the clamping cone in the direction of rotation corresponding to the release of the jaws. In order to reduce the number of components required for the construction of the drill chuck, while the second control cam is formed on the control sleeve. Furthermore, the design is such that the pawl is formed as a two-armed lever having a first lever arm having at least one ratchet and a second lever arm intended for engagement with the second control cam, wherein the bearing axis of the pawl and the pin are integrally formed by a component ,

The spring acts on the first, the ratchet teeth having Lever arm. In addition, the clamping cone is designed in two parts with an adjustment of the pawl serving Lösering. The second ring gear is formed on the chuck body.

It should be noted in the invention provided Nachspannbegrenzung, however, that at an increased initial resistance during the clamping process, it is that the drill chuck is dirty and thus stiff, that it is rotated with a very high torque in the opening direction "to stop" and is thus easily clamped or that the tool shank is inserted incorrectly between the clamping jaws, the trailing limit limitation can already be activated, which can lead to a limitation of the clamping force due to the limited adjustment travel It is therefore preferred if there are means for increasing the torque initially required at the beginning of the clamping operation are by which the initial blocking can be solved and the subsequent voltage can be continued with the usual torque before the Nachspannbegrenzung responds.

In a simple way, these means can be realized by a bolt is mounted in the jaw holder, which engages under the force of a spring in the clamping cone associated bolt receptacle, it being provided to avoid a reduction of the maximum achievable clamping force that the bolt receiving assigning bolt head is formed in cooperation with the bolt receptacle for determining the switching force and the force of the spring is chosen as low as possible to ensure only the engagement of the bolt in the bolt receptacle.

Alternatively, or in addition, these means may be formed by at the Steuerhϋlse at least one switching lug is formed, which engages before the beginning of the clamping process in a nose holder formed on the jaw holder and leaves it at the beginning of the clamping operation.

In the following the invention is explained in more detail in exemplary embodiments illustrated in the drawing; show it:

1 is a side view of a drill chuck according to the invention, shown cut in the left half and at the axially rear end,

2 shows the section H-II of Figure 1,

3A shows the section I H-111 shown in Figure 1 in the release position,

3B shows the section IH-III shown in Figure 1 in the clamping position,

4 shows the section IV-IV of Figure 1,

5 is a perspective view of the release ring,

6 is a perspective view of the control sleeve,

7 is a perspective view of the locking slide,

Fig. 8 is a representation corresponding to Figure 1 another

embodiment

9 shows the section IX-IX of Figure 8, 10 shows the section XX of Figure 8,

11 shows the section XI-XI of Figure 8,

12 shows the section XII-XII of Figure 8, Rg. 13 is a representation corresponding to Figure 1 of another embodiment,

FIG. 14 is a representation of the embodiment corresponding to FIG. 3B

FIG. 13. FIG. 15 is a representation of another, corresponding to FIG

Embodiment, FIG. 16 shows the section XVI-XVI from FIG. 15,

17 shows the section XVII-XVII from FIG. 15, and FIG. 18 shows the detail XVIII from FIG. 17.

V

In the drawing, in Rgur 1 a chucking drill chuck is shown, which has a chuck body 1 and an axially to chuck body 1 rotatable clamping cone 2, axially supported on a chuck body 1 mounted jaw holder 3. In the jaw holder 3 clamping jaws 4 are guided in guide slots, the for clamping and releasing by a relative rotation between the chuck body 1 and the clamping cone 2 with the jaw holder 3 are adjustable. The chuck further comprises a Veniegelungseinrichtung having a coaxial to the chuck axis second sprocket 19 on the one hand and under the force of a spring 23 in the second sprocket 19 engaging, mounted on the jaw harder 3 pawl 20 on the other hand, wherein the locking device, the chuck body 1 and the clamping cone. 2 locked in the second sprocket 19 pawl 20 against relative rotation in the sense of releasing the jaws 4 blocks, relative rotations in the sense of clamping but unrestricted permits, so that the restoring property of Drill chuck is not obstructed. In the drawing, embodiments are shown in which the second ring gear 19 is formed on the chuck body 1. At the jaw holder 3 and the clamping cone 2 are a stop and counter stop 11 for defined limitation of relative rotatability of the clamping cone 2 relative to the jaw holder 3 between a first, the engaged state of the pawl 20 and a second, the disengaged state corresponding rotational position formed by means of a locking device 12, which includes two locking seats 13, this first rotational position and this second rotational position can be secured. In the embodiments shown in the drawing, however, the clamping cone 2 is designed in two parts with an adjustment of the pawl 20 serving release ring 22, which also carries the counter-stops 11 and which is limited relative to the jaw holder 3 adjustable component. Since here the rotatability relative to the jaw holder 3 is provided by the release ring 22, the front part of the clamping cone 2 can also be non-rotatable relative to the jaw holder 3 or rotatably connected thereto. The detent member 26 having latching device 12 is at least in the corresponding direction of release rotation of the clamping cone 2 whose rotation relative to the jaw holder 3 only upon reaching a predetermined clamping force free.

This is done by the clamping jaws 4 are guided to bear against the tool shank during clamping of the chuck and thereby the further adjustment of the clamping jaws 4 experiences a greater resistance, which requires the application of increased torque in the rotation of the clamping cone 2, so that in this Operating situation, the locking device 12 in the change between the second rotational position and the first rotational position in the engaged state of the pawl 20 in the second sprocket 19 secures the rotational position.

To facilitate opening of the drill chuck for a tool change, the Pawl 20 are disengaged again from the second sprocket 19, to which the clamping cone 2, a second control cam 21 is assigned to adjust the pawl 20 when the clamping cone 2 is rotated in the direction of rotation corresponding to the release of the clamping jaws 4. In order to ensure such a release of the clamping of the tool shank, a device for limiting the rest tension is further realized in the drill chuck shown in the drawing. For this purpose, a rotatably mounted on the chuck body 1 grip sleeve 5 is present, in which a locking slide 6 is arranged, which in a change between the second rotational position and the first rotational position of a disengaged from the chuck body 1 associated first sprocket 7 position in a in Engaged position is adjusted. If the rotation in the reverse direction, the locking slide 6 is again brought out of engagement with the first ring gear 7. Furthermore, a stop for limiting the relative rotatability of the grip sleeve 5 is provided relative to the jaw holder 3 in the sense of re-tensioning, wherein the tensioning cone 2 is assigned a control cam 9 for radial adjustment of the locking slide 6. The control cam 9 is formed on a rotatably connected to the clamping cone 2 and the release ring 22 control sleeve 10 as an axially projecting sleeve collar 14 which engages in a transverse slot 15 of the locking slide 6, wherein expediently the control sleeve 10 and the second control cam 21 for the locking device wearing. The stop 8 itself is formed by a jaw holder 3 arranged on the pin 16 which engages in a trained in the grip sleeve 5, extending in the circumferential direction slot 17 which extends in the illustrated embodiment over an angle of 24 °. Between the grip sleeve 5 and the jaw holder 3, a return spring 18 is arranged.

In the embodiments shown in Figures 15 to 18 are means to increase the initially required at the beginning of the clamping torque, namely on the one hand in the jaw holder 3 mounted bolt 30 which engages under the force of a spring in the clamping cone 2 associated bolt receptacle 31, wherein the bolt receptacle 31 zuweisende bolt head 32 in cooperation with the bolt receptacle 31 is shaped to determine the switching force, so as to be able to minimize the spring force and after the triggering of the switching operation, the frictional resistance, which could affect the clamping force to reach to be able to neglect, so the force of the spring is chosen as low as possible to ensure the engagement of the bolt 30 in the bolt receptacle 31.

In the figures 17 and 18, a further embodiment is shown in which on the control sleeve 10 at least one switching lug 33 is formed, which engages before the beginning of the clamping process in a formed on the jaw holder 3 nose pocket 34 and leaves it at the beginning of the clamping operation. Here, however, due to the increased frictional resistance, there is an impairment of the maximum achievable clamping force.

The operation of the drill chuck according to the invention is briefly described below, starting from a chuck with open clamping jaws 4. If the shank of a drilling tool is guided between the clamping jaws 4 and the clamping cone 2 is rotated in the direction corresponding to the closing of the chuck with the clamping jaws 4 connected driver 24 is rotated in a threaded bore 25 of the chuck body 1 and so adjusted the jaws 4 axially forward on the tool shank. Come the jaws 4 on the tool shank to the system, the rotational resistance increases and the Rasteinrichung 12 changes the locking seat 13 and thus the rotational position, so that the pawl 20 in the second ring gear 19 engages, because the formed on the control sleeve 10 second control cam 21, the SperrWinke 20 adjusted. When the control sleeve 10 is rotated, the locking cam 6 is also adjusted radially inwards by means of the first control cam 9 so that it engages with the first toothed rim 7 via the bead 28 (FIGS. 13, 14) with the aid of the spring 29. remains engaged even at high torques, and on the locking slide 6, the grip sleeve 5 rotatably coupled to the chuck body 1 and by means of the stop 8 causes a limitation of the post-tension.

LIST OF REFERENCE NUMBERS

1 chuck body

2 clamping cone 3 jaw holder

4 jaws

5 handle sleeve

6 locking slide

7 first sprocket 8 stop 9 control cam

10 control sleeve

11 counter-attack

12 locking device 13 locking seat

14 sleeve collar

15 transverse slot

16 pen

17 slot 18 return spring

19 second sprocket

20 pawl

21 second cam

22 Loosen ring 23 spring

24 drivers

25 threaded hole

26 locking member 27 locking tooth

28 bead

29 spring

30 bolts

31 Bolt holder 32 Bolt head

33 switching nose

34 nose pocket

Claims

claims:

1. Nachspannendes chuck with a chuck body (1), a coaxial with the chuck body (1) rotatable clamping cone (2), axially supported on a chuck body (1) mounted jaw holder (3), in which in guide slots clamping jaws

(4) are guided, which are adjustable for clamping and releasing by a relative rotation between the chuck body (1) and the clamping cone (2) with the jaw holder (3), wherein on the jaw holder (3) has a stop and on the clamping cone (2 ) a counter stop (11) for defined limitation of a relative rotatability of the clamping cone (2) relative to the jaw holder (3) between a first, and a second rotational position is formed, and wherein a detent member (26) having latching means (12) with one of the first rotational position associated and one of the second rotational position associated with the locking seat (13) between the jaw holder and the clamping cone (2) is arranged, characterized in that the chuck body (1) a grip sleeve (5) is rotatably mounted in a locking slide (6) is located in a change between the second rotational position and the first rotational position of a disengaged from the chuck body (1) associated first sprocket (7) in position an engaged position is adjusted, and vice versa, and that a stop (8) for limiting the relative rotatability of the grip sleeve (5) relative to the jaw holder (3) is provided in the sense of tightening.

2. Drill chuck according to claim 1, characterized in that the clamping cone (2) and / or the jaw holder (3) has a control cam (9) for the radial adjustment of the locking slide (6).

3. Drill chuck according to claim 2, characterized in that the control cam (9) is formed on a rotatably connected to the clamping cone (2) control sleeve (10) as an axially projecting sleeve collar (14) in a transverse slot (15) of the locking slide (6 ) intervenes.

4. Drill chuck according to one of claims 1 to 3, characterized in that the stop (8) is formed by a pin (16) arranged on the jaw holder (3), which is formed in a circumferential slot (17) in a grip sleeve (5) ) intervenes.

5. Drill chuck according to claim 4, characterized in that the oblong hole (17) extends over an angle of 12 ° to 36 °, preferably of 24 °.

6. Drill chuck according to one of claims 1 to 5, characterized in that between the grip sleeve (5) and the jaw holder (3) a return spring (18) is arranged.

7. Drill chuck according to one of Claims 1 to 6, characterized by a locking device which has a second toothed ring (19) which is coaxial to the chuck axis and which is mounted on the jaw holder (3) under the force of a spring (23) in the second toothed rim (19) Pawl (20) on the other hand has and the chuck body (1) and the pawl (20) in the second sprocket (19) engaged pawl

(20) against relative rotation in the sense of releasing the clamping jaws (4) blocks, but relative rotations in the sense of clamping but unhindered leaves, wherein the first rotational position of the engaged state and the second rotational position of the disengaged state of the pawl (20) relative to the second Sprocket (19) corresponds.

8th . Drill chuck according to claim 7, characterized in that the

Clamping cone (2) has a second control cam (21) for adjusting the pawl (20) from the in the second sprocket (19) engaged position in the disengaged position upon rotation of the clamping cone (2) in the

Direction of rotation corresponding to the release of the clamping jaws (4).

9. Drill chuck according to claim 8, characterized in that the second control cam (21) on the control sleeve (10) is formed.

10. Chuck according to one of claims 7 to 9, characterized in that the pawl (20) as a two-armed lever with at least one

Locking tooth (27) having the first lever arm and with a second stop for abutment with the second control cam (21) is formed second lever arm.

11. Drill chuck according to one of claims 7 to 10, characterized in that the bearing axis of the pawl (20) and the pin (16) are integrally formed by a component.

12. Drill chuck according to claim 10 or 11, characterized in that the spring (23) acts on the first, the locking tooth (27) having lever arm.

13. Chuck according to one of claims 7 to 12, characterized in that the clamping cone (2) is designed in two parts with a release ring (22) serving to adjust the pawl (20).

14. Drill chuck according to one of claims 7 to 13, characterized in that the second toothed rim (19) on the chuck body (1) is formed.

15. Drill chuck according to one of claims 1 to 14, characterized in that to secure the engagement of the locking slide (6) in the first sprocket (7), the adjustment of the locking slide (6) radially outwardly blocking

Bead (28) is provided.

16. Drill chuck according to claim 15, characterized in that the bead (28) is formed on the release ring (22).

17. Drill chuck according to one of claims 1 to 16, characterized in that means for increasing the initially required at the beginning of the clamping torque are present.

18. Drill chuck according to claim 17, characterized in that in the jaw holder (3) a bolt (30) is mounted, which engages under the force of a spring in a clamping cone (2) associated with the bolt receptacle (31).

19. Drill chuck according to Claim 18, characterized in that the bolt head (32) facing the bolt receptacle (31) is shaped in cooperation with the bolt receptacle (31) for determining the shifting force.

20. Drill chuck according to claim 18 or 19, characterized in that the force of the spring is chosen as small as possible in order to ensure only the engagement of the bolt (30) in the bolt receptacle (31).

21. Drill chuck according to claim 17, characterized in that at the Control sleeve (10) at least one switching lug (33) is formed, which engages before the beginning of the clamping operation in a on the jaw holder (3) formed nose pocket (34) and leaves this at the beginning of the clamping operation.