EP1513653B1 - Chuck for receiving tools operated by rotating around the axis thereof - Google Patents

Description

The invention relates to a chuck according to the preamble of claim 1 or claim 2.

Such foods describe the DE 29 34 428 or the DE 199 32 369 , There is in a polygonal hole of a Einsteckabschnittes the polygonal section of a bit. On the outer surface of the bit, in particular on its edge or edge recess acts formed by a ball holding element. From a sloping edge of an actuating sleeve, the ball is pressed radially inwardly against a polygonal edge or into the corner recess. The required force is supplied by a compression spring absorbing the actuating sleeve against whose spring force the sleeve is displaced in the release direction.

The EP 1 122 032 A2 describes a chuck in which the bottom of the receiving cavity is formed by a magnet. The actuating sleeve can be switched back and forth in the axial direction between two detent positions.

The WO00 / 66329 describes a chuck, in which the bit stuck in the receiving cavity releasing the holding element is slightly displaced in the withdrawal direction. The US 6,199,872 B1 describes a chuck with a spring-loaded ram. The compression spring is tensioned when the bit is inserted into the receiving cavity and relaxes when the holding member is brought out of its operative position, so that the bit is displaced in the outward direction of the plunger.

The invention has for its object to further develop a generic feed benefits advantageous and in particular to facilitate the removal of the bit.

The object is achieved by the invention specified in the claims.

First and essentially it is provided that the clamping section is displaceable relative to the sleeve section. By means of this displacement, the magnet can be brought out of contact with the end face. As a result of the spacing of the magnet from the end face of the bit, the holding force which the magnet exerts on the bit is considerably reduced, so that even small and, in particular, short bits can be easily removed from the chuck. Preferably, the bit is supported with a ring region of its end face, which is designed in particular as a bevel on a radial projection. This radial projection may surround a cavity in which the magnet is located. The magnet may be fixedly connected to a portion of the clamping portion. This clamping section has a polygonal cross-sectional shape. This clamping section can be arranged rotationally fixed, but axially displaceable within the insertion portion of the chuck. He is stored there axially displaceable. The clamping section can be axially displaceable between two stops, the one stop corresponding to the axial position of the clamping section, in which the magnet is in planar contact with the end face of the bit. The other stop may be associated with the spacing position of the magnet from the face of the bit.

The operation of this chuck is the following: If the chucking section is tied up in the chuck of an electric screwdriver, the chuck can be brought into a pick-up position by moving the actuating sleeve. However, in the preferred embodiment of the chuck, this is not necessary because the ball can dodge backwards as it encounters the back chamfer of the bit. If the bit is inserted into the receiving cavity, it lies flat against the bottom of the cavity, that of the axially displaceable magnet is formed on. He is held by the magnet. The bit is also held by the ball. If the bit is to be removed from the chuck, the actuating sleeve is displaced away from the clamping section, ie towards the opening of the receiving cavity. Along with this displacement, a tensile force is applied to the chucking portion inserted in the chuck of the electric wrench. Along with this, the magnet which is fixedly connected to the chucking portion is displaced back, so that the holding force exerted by the magnet on the bit is considerably reduced. In this functional position of the actuating sleeve, the ball can dodge radially, so that the bit can be removed.

Another aspect of the invention is also concerned with the problem of simplifying the removal of a bit from a generic food. For this purpose, it is proposed that the actuating member as a result of a shift einnes Einspannabschnittes relative to the sleeve portion in which the clamping portion is inserted, in its retaining element out of effect holding position can be determined. According to this embodiment, the holding element is brought out of its operative position, so that the bit can be pulled out without the need for holding the actuator in its release position. This function is particularly advantageous if the end of the clamping section, which is inserted in the sleeve section, carries a magnet which abuts the end face of the bit in the clamping position. By shifting out of the Einspannabschnittes from the sleeve, the magnet is separated from the bit. In this case, the bit is supported with its end edge on a snap ring, which rests in a circumferential groove of the sleeve portion. The axial displaceability of the clamping section is stop-limited. For this purpose, a spring ring which lies in a circumferential groove of the sleeve portion. It forms a radial projection, which rests in a circumferential groove of the clamping section. The axial width of the circumferential groove of the clamping section determines its displacement path. The actuator is preferably determined by at least one in a wall recess of the sleeve portion locking body, which enters a locking recess of the actuator, found. In this case, the blocking body can be a ball and the locking recess can be formed by an annular groove. The diameter of the locking body is greater than the wall thickness of the sleeve portion. This has the consequence that the blocking body either protrudes beyond the outer wall of the sleeve portion or projects into the sleeve cavity. If the blocking body projects beyond the outer wall of the sleeve, it can enter the locking recess of the actuating member in order to hold it in the release position. The locking body rests on a lateral surface portion of the clamping section and is supported by it. With the clamping portion 15 pushed in inward direction, the blocking body can dip into an evasion niche of the clamping portion. In this position, the clamping portion of the held by a spring in the locking position actuator is axially motion-bound. In this, the clamping position of the actuating member corresponding position of the locking body is prevented by the cylindrical inner cavity wall of the actuating member from being displaced in the radial outward direction. Preferably, the sleeve forming the actuator is displaced in the removal direction of the bit from the locking position to the release position. This takes place against the force of a spring which is supported against the sleeve section. If the actuating sleeve is displaced into the release position, then the ball forming the blocking body can enter the ring recess of the actuating sleeve forming the locking recess. The ball then emerges from the evasion niche of the chucking section so that the chucking section can be displaced. During this displacement, a lateral surface section of the Einspamabschnittes pushes under the wall recess in which the ball rests, so that a radial displacement of the ball is not possible. The ball locks the return displacement of the Actuating sleeve, The bit can be easily removed from the Aufnahmehöl- tion. If the bit is again inserted into the receiving cavity, its end face on the side of the chamfer acts on the abovementioned radial projection of the sleeve section. Along with this, the sleeve section is displaced relative to the clamping section until the locking ball can dip into its associated evasion niche. Then, the actuating sleeve moves according to the force of the previously tensioned spring in its blocking position.

Embodiments of the invention are explained below with reference to attached figures.

Fig. 1:

Darstellung eines ersten Ausführungsbeispiels der Erfindung teilsweise im Längsschnitt, wobei die Spitze des Bits und ein Teilbereich Einspannabschnitt des Futters weggebrochen sind,

Fig. 2:

das in der Fig. 1 dargestellte Ausführungsbeispiel mit zurückverlagertem Magneten,

Fig. 3:

ein zweites Ausführungsbeispiel gemäß Fig. 1,

Fig. 4:

das zweite Ausführungsbeispiel an einer Darstellung gemäß Fig. 2,

Fig. 5:

in perspektivischer Darstellung ein drittes Ausführungsbeispiel der Erfindung,

Fig. 6:

einen Längsschnitt durch das in Fig. 5 dargestellte Ausführungsbeispiel mit in Sperrstellung befindlicher Betätigungshülse,

Fig. 7:

eine Darstellung gemäß Fig. 6 mit in Freigabestellung verlagerter Hülse,

Fig.8:

eine Folgedarstellung der Fig. 7 mit axial verlagertern Einspannabschnitt,

Fig. 9:

eine Darstellung gemäß Fig. 6 beim Einschieben eines Bits, wobei sich die Betätigungshülse in der Verriegelungsstellung befindet, und

Fig. 10:

eine Darstellung gemäß Fig. 6 bei eingeschobenem Bit.

Show it:

Fig. 1:

Representation of a first embodiment of the invention partly in longitudinal section, wherein the tip of the bit and a partial region clamping portion of the chuck are broken away,

Fig. 2:

that in the Fig. 1 illustrated embodiment with zurückverlagertem magnet,

3:

a second embodiment according to Fig. 1 .

4:

the second embodiment of a representation according to Fig. 2 .

Fig. 5:

in a perspective view a third embodiment of the invention,

Fig. 6:

a longitudinal section through the in Fig. 5 illustrated embodiment with located in the blocking position actuating sleeve,

Fig. 7:

a representation according to Fig. 6 with displaced in release position sleeve,

Figure 8:

a following presentation of the Fig. 7 with axially displaced clamping section,

Fig. 9:

a representation according to Fig. 6 when inserting a bit, wherein the actuating sleeve is in the locked position, and

Fig. 10:

a representation according to Fig. 6 with inserted bit.

The chuck has a male portion 3 and a hexagonal chuck portion 15. This male portion 3 may be made of metal and has a receiving cavity 2 for a screwdriver bit 1, in the form of a bit. At the other end, a clamping shaft 15 protrudes from the insertion section, the hexagonal section of which can be inserted into a chuck of an electric screwdriver. Regarding the configuration of this clamping shaft reference is made to the cited prior art. The clamping section 15 can be pressed into a cavity of the insertion section 3.

The receiving cavity 2 has a hexagonal cross-section. In the region of an edge of the receiving cavity 2 is a window. In this opening formed by the window is a ball 4, which forms the holding element and whose diameter is greater than the wall thickness, so that the ball 4 may extend into the receiving cavity 2, to there on the vertices of a corner recess of the polygonal shaft of the Supporting bit holding this. Outside the cavity, the ball 4 is acted upon by an oblique clamping flank 10 of an actuating sleeve 5. The actuating sleeve 5 is against the Rückstellkrart a helical compression spring 11 of the in Fig. 1 , or 6 illustrated clamping position in the in Fig. 2 or 7 illustrated release position displaced, wherein the helical compression spring 11 is tensioned. The helical compression spring 11 is supported on an annular support shoulder. This support shoulder is formed by a lying in a groove of the insertion portion 3 ring 14, against which also the actuating sleeve 5 is supported in the clamping position

The bottom 7 of the receiving cavity 2 is formed by a circular cylindrical magnet 9. Between the outer wall of the magnet 9 and the Mehrkantecke the receiving cavity 2 forms a free gusset. In this free gusset the spring end 8 is guided.

A bit 1 is inserted in a receiving cavity 2 of a plug-in section 3, which is designed overall as a polygonal sleeve. In a slot of the wall is a ball 4, which is acted upon by a spring in the direction of the opening of the receiving cavity 2. Mittelst a clamping edge 10 of an actuating sleeve 5, the ball is acted upon radially inwardly. In the rear part of the insertion portion 3, the portion 15 'of a Einspannabschnittes 15. The clamping portion 15 is formed as a hexagon and is intended to be inserted with its free end in the lining of an electric screwdriver can. The section 15 'of the Einspannabschnittes 15 is rotatably but axially displaceable in the plug-in section 3. In front of the head of the section 15 is a magnet 9. The magnet 9 is fixedly connected to the section 15. The Axialverlagerbarkeit the Binspannabschnittes 15 is limited stop. For this purpose, a projection 17, which can be rolled or embossed 15 after the mounting of the clamping section. This projection 17 engages in a circumferential recess 16 of the section 15 'a.

An annular chamfer 19, which surrounds the annular surface 1 'of the bit, is supported on a radial projection 20. This radial projection 20 leaves a central opening in which the magnet 9 is located. The magnet 9 lies in the in Fig. 1 shown position of use with its surface 7 area on the end face 1 'from. If an axial force is exerted on the clamping section 15, it is transmitted via the magnet 9 directly into the end face 1 'of the bit 1. On the other hand, if a tension greater than the holding force of the magnet 9 on the end face 1 'of the bit 1 is exerted on the clamping section 15, the magnet 9 is removed from the end face 1' of the bit 1. This removal of the magnet 9 from the bit 1 has the consequence that the holding force that unfolds the magnet 9 to the bit 1 is significantly reduced, so that the bit at a brought into the release position actuating sleeve (see. Fig. 2 ) can be pulled out of the receiving cavity 2.

The pulling force can be applied by displacing the actuating sleeve 5 in the direction of the opening of the receiving cavity 2 in the case of a clamping section 15 clamped in a chuck of an electric screwdriver or the like. Simultaneously with this displacement, the ball 4 is released to dodge in the radial direction to the outside.

That in the FIGS. 3 and 4 illustrated embodiment corresponds in terms of its operation substantially to the embodiment of FIGS. 1 and 2 , Essential there is the stop-limited mounting of the clamping section 15 in the polygonal cavity of the insertion section 3. The hexagonal clamping section 15 has corner recesses into which a spring ring 23 surrounding the clamping section 15 rests. This spring ring is located in a ring recess 25 of the insertion portion 3. The annular recess 25 of the insertion portion 3 is formed by a plugged onto the end of the insertion portion 3 sleeve portion. For this purpose forms the end section of the Einsteckabscltnittes 3 an annular step portion 24. On this annular step portion 24, a diameter-wide wall portion 22 of the sleeve end portion 21 is attached. He sits there in a tight fit.

In the in the FIGS. 5 to 10 illustrated embodiment, the actuating sleeve 5 is formed in two parts. An inner portion 5 sliding directly on the sleeve portion 21 has an axially circumferential groove. A second sleeve section 5 "made of plastic is rotatably disposed in this peripheral groove 5. The lining can also be held during the turning operation on this second sleeve section 5". The sleeve 5 "can rotate freely in the groove receiving it.

The in the FIGS. 6 to 8 shown bit has a throat 29. In the in FIG. 6 shown locking position projects a retaining ball 4 in some areas in the receiving cavity 2 and rests on a rear valley flank, so that the bit can not be pulled out of the receiving cavity 2. The frontal bevel of the bit abuts against a snap ring 20 which rests in a circumferential groove of the receiving cavity 2. The ball 4 is acted upon by a clamping flank 10 of the sleeve part 5. The sleeve 5 is by means of a spring 11 in the in FIG. 10 held shown locking position. In this locking position, the rear end face of the bit 1 bears against an end face 7 of a clamping section 15. The end face 7 is formed by a magnet 9, which rests in a bore 30 of the end face of the clamping section 15.

In the rear region of the sleeve portion 21 has two diametrically opposite wall recesses 31. The diameter of the substantially circular wall recess 31 corresponds to slightly more than the diameter of the recess 31 einliegen in the wall recess ball 27. The diameter the detent ball 27 is greater than the wall thickness of the sleeve portion 21, so that the detent ball 27 either partially protrudes into the cavity of the sleeve portion 21 or protrudes beyond the outer wall of the sleeve portion 21. In the in FIG. 6 shown blocking position protrudes the locking ball 27 into the cavity of the sleeve portion 21 into it. In this cavity is axially movable, a portion of the clamping section 15 a. There, the chucking portion 15 has two diametrically opposite alternate recesses 28. These recesses 28 may be formed by a circumferential groove.

Will, like the FIG. 7 shows, moved in the removal direction of the bit 1 relative to the sleeve portion 21, so the spring 11 is tensioned. In the in FIG. 7 Displacement position shown is an inner annular groove 26 in an aligned position to the wall recess 31. The two diametrically opposite detent ball 27 can thus escape radially outward from the alternate well or circumferential groove 28. While the displaceability of the clamping section 15 in the in FIG. 6 Locked position shown locked, it is in the in FIG. 7 shown release position possible.

In the in FIG. 8 shown operating position of the clamping portion 15 is displaced relative to the sleeve portion 21. In this position, a lateral surface section of the clamping section 15 supports the inner side of the detent ball 27, so that it can not escape from the annular recess 26 of the actuating sleeve 5. The actuating sleeve is held in this operating position in its release position.

The displacement of the Einspannabschnittes is limited by a snap ring 17 which rests in an inner groove of the sleeve portion 21 and radially inwardly rests in a ring recess 16 of the clamping section 15 The axial width of the recess 16 defines the axial displacement path of the clamping section 15.

In the in FIG. 8 shown position, the retaining ball 4 dodge radially outward, so that the bit can be removed.

The feeding of the feed with a new bit is done in reverse order. For example. can in the in FIG. 8 shown operating position of the bit as far into his Aufätahmehöhlung 2 are inserted until his face or the end face side bevel touches the snap ring 20. Either by the then becoming effective magnetic force of the magnet 9 or by mechanical force of the clamping section 15 of the in FIG. 8 position shown in the in FIGS. 6 or 7 shown shifted position. In this position, the detent ball 27 can dodge radially inwardly into the evasive cavity 28 or circumferential groove, so that the actuating sleeve 5 for displacement into the locking position ( FIG. 6 ) is released. This shift takes place by the force of the tensioned spring 11.

But it is also possible to use a bit in the locking position befindlicher actuating sleeve ( FIG. 9 ) in the receiving cavity 2 into stick. The retaining ball 4 is axially displaceable in a window of the sleeve wall. It is displaceable against the force of a spring 32 in the insertion direction of the bit. If the end face of the bit acts on the retaining ball 4, then the retaining ball 4 can displace in the direction of insertion of the bit with simultaneous tension of the spring 32. It then slides along the clamping flank 10 and can thereby move radially outward until it passes over the lateral surface of the bit. The bit can then be completely inserted into the stop position in the receiving cavity 2 (cf. FIG. 9 ). In this position, the retaining ball 4 acts without even in the corner recess einzuliegen as pull-out protection for the bit

By a slight displacement of the actuating sleeve 5 in the direction of the release position of the radial movement path of the retaining ball 4 is slightly increased. The retaining ball 4 is thereby displaced by the spring 32 into the end region of the window, so that the retaining ball 4 can enter into a corner recess of the bit (see. FIG. 10 ). In this position, the clamping flank 10 acts on the retaining ball 4 in the radial direction. The detent ball 27 is located in the evasion niche 28 of the Binspannabschnittes 15, so that the clamping portion 15 is tied in the axial direction of the sleeve portion 21.

Claims (11)

1. Chuck for receiving tools (1) which can be used by rotation about their axis, in particular screwdriver inserts, having an insertion portion (3) having a receiving cavity (2) which has a cross-sectional area that is not round, in which receiving cavity (2) the tool (1) can be secured by means of a holding element (4) associated with the wall of the cavity against being pulled out of the receiving cavity (2), which holding element (4) can be deactivated by a sliding movement of an actuating member, in particular in the form of an actuating sleeve (5), the tool (1) being supported at the rear in the receiving cavity (2) and bearing against a magnet (9) with its rear end face (1'), characterized in that the magnet (9) can be brought in its position out of bearing to the end face (1') as a result of a sliding movement of a clamp-in portion (15) with respect to a sleeve portion (21).
2. Chuck for receiving tools (1) which can be used by rotation about their axis, in particular screwdriver inserts, having an insertion portion (3) having a receiving cavity (2) which has a cross-sectional area that is not round, in which receiving cavity (2) the tool (1) can be secured by means of a holding element (4) associated with the wall of the cavity against being pulled out of the receiving cavity (2), which holding element (4) can be deactivated by a sliding movement of an actuating member, in particular in the form of an actuating sleeve (5), the tool (1) being supported at the rear in the receiving cavity (2), and having a clamp-in portion (15) which fits into a sleeve portion (21), characterized in that the actuating member (5) can be locked in its position which holds the holding element (4) deactivated as a result of a sliding movement of the clamp-in portion (15) with respect to the sleeve portion (21).
3. Chuck according to Claim 1, characterized in that the magnet (9) is fixedly connected to a portion (15') of the clamp-in portion (15) which is displaceable in its axial direction in a stop-limited manner.
4. Chuck according to one of the preceding claims, characterized by a stop which is formed by a radial projection (17) engaging with an annular cutout.
5. Chuck according to Claim 4, characterized in that the annular cutout (16) is associated with the clamp-in portion (15) and the radial projection (17) with the sleeve portion (12).
6. Chuck according to Claim 4, characterized in that the radial projection (17) is formed by a circlip.
7. Chuck according to Claim 1, characterized in that the magnet (9) is inserted, in particular adhesively bonded or pressed, into a bore in the end of the clamp-in portion (15).
8. Chuck according to one of the preceding claims, characterized in that the holding element (4) is a pressure piece which acts on the clamp-in shank of the tool (1) in the radial direction and is acted on by a clamping flank (10) of the actuating sleeve (5), which is spring-loaded in the opposite direction to the release direction (L).
9. Chuck according to one of the preceding claims, characterized in that the actuating member (5) can be locked by means of at least one blocking body (27) which is located in a wall cutout (31) and moving into a blocking recess (26) towards the actuating member (5).
10. Chuck according to Claim 8, characterized in that the blocking body (27) is a ball and the blocking recess (26) is an annular groove.
11. Chuck according to Claim 8 or 9, characterized in that the blocking body (27), when clamp-in portion (15) is slid into the sleeve portion (21), is in part located in a moving-aside niche (28) in the clamp-in portion (15) and, when the clamp-in portion (15) is pulled out, is supported at the rear by a lateral surface portion of the clamp-in portion (15).

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