Chucks or sockets – Socket type – Obliquely guided reciprocating jaws
Patent
1991-10-11
1992-12-29
Bishop, Steven C.
Chucks or sockets
Socket type
Obliquely guided reciprocating jaws
279140, 279902, B23B 3112
Patent
active
051745887
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention is related to a hand machine tool, such as a drill, having a locking chuck. A percussion drilling device with drill chuck which is suitable for hand machine tools is disclosed in German Patent Publication DE-C 35 16 451, its adjusting ring for the chuck jaws being secured against rotation by means of a sleeve during operation. The sleeve must be drawn back and locked in order to adjust the chuck jaws. If the user forgets to disengage the lock before operating the tool, the means for securing against rotation are not effective, the chuck jaws can move back and the tool becomes loose during the percussion drilling.
SUMMARY OF THE INVENTION
According to the invention, a chuck for a drill or the like comprises a body having a plurality of jaws, means for adjusting the jaws to receive a tool and means for securing the adjusting means, the securing means being movable from an unlocked position, in which said tool can be received, to a locked position automatically during operation of said drill. The tool can no longer become loose during operation after clamping. This is achieved in that the securing sleeve is automatically guided into its locking position to secure against the rotation of the adjusting ring during the percussion drilling operation. The locking is particularly important in keyless drill chucks whose internal friction is reduced by means of roller bearings.
An advantageous development and improvement of the drill chuck is made possible by a sliding surface, on which a sliding member adheres during the clamping, that is, when the machine is stopped, but slides off during the shaking brought about during operation. The construction of the sliding surface ensures that the securing sleeve is moved into the locking position. The arrangement of a catch recess immediately adjoining the sliding surface, ensures a secure locking of the securing sleeve in the locking position. A sloping guide surface between the sliding surface and the catch recess, enables a smooth unlocking of the securing sleeve. The sliding surface can either be arranged at the securing sleeve or at retaining means such as a rotatable ring connected with the base body. The sliding member is fastened at the retaining means or at the securing sleeve. The construction of the retaining means as a rotatable ring, is an embodiment which is particularly simple and easy to use. The arrangement of two sliding surfaces at both sides of the catch recess, offers the possibility of rotating the ring in any direction during adjustment or of providing one of the sliding surfaces with a locking nose, so that the securing sleeve does not lock into the locking position in this position. This is useful in rotary drilling when a subsequent loosening of the tool is not to be expected. The arrangement of a sliding surface without locking nose, in the rotating direction of the catch recess in which the clamping sleeve is rotated for closing the drill chuck makes it possible for the clamping sleeve and the ring to be gripped simultaneously, so that the ring can be rotated along with it until reaching the stop. Accordingly, it is ensured in a very user-friendly manner that the securing sleeve automatically moves into its locking position during operation in normal cases. The selection of saw teeth as coupling means, ensures that the chuck jaws cannot open when the coupling teeth are offset, but rather, at most, can continue to close. A disk spring, which is arranged between the adjusting ring and the base body or thrust bearing maintains a minimum clamping force even when roof-shaped teeth are used as coupling means instead of the saw teeth. The arrangement of a roller bearing for preventing the axial friction forces during the clamping of the drill chuck, enables a secure clamping by hand without a tool.
The present invention both as to its construction so to its mode of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiment
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Baumann Otto
Muller Rolf
Reibetanz Wilbert
Wanner Karl
Bishop Steven C.
Robert & Bosch GmbH
Striker Michael J.
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