Patent ID: 8262096

Claim:
A self-tightening drill chuck having a chuck body, a tightening sleeve rotatable coaxially relative to the chuck body, axially fixed on a jaw holder carried on the chuck body, and in which jaws guided in grooves are movable with the jaw holder for tightening and loosening on a relative rotation between the chuck body and the tightening sleeve, a stop on the tightening sleeve and a counterstop on the jaw holder only permitting relative rotation of the tightening sleeve and the jaw holder between a first angular position and a second angularly offset position, a catch having a catch member with one catch seat associated with the first angular position and one catch seat associated with the second angular position being provided between the jaw holder and the tightening sleeve wherein a grip sleeve rotatable on the chuck body carries a locking slide that when changing between the second angular position and the first angular position is displaced from a position disengaged from a first array of gear teeth on the chuck body into an engaged position, and vice versa, and in that the stop is provided for limiting relative rotation of the grip sleeve and the jaw holder in a tightening direction.