Patent ID: 7296803

Claim:
A self-tightened reverse locking chuck, comprising: a body member, jaws, and a nut, three jaws being respectively received in three equally spaced angled bores of the body member, the nut being in threaded transmission with the jaws received in the angled bores of the body member, a transmission connecting shaft being mounted in clearance fit in a central hole of the rear end of the body member, a drive sleeve being fixedly connected to the outside of the rear end of the transmission connecting shaft, a front sleeve being fixedly connected to the front portion of the body member, wherein a plurality of drive keys are disposed along the front circumference of the drive sleeve; a spring ring axially positions the transmission connecting shaft in the central hole of the body member; a movable ratchet wheel is provided between the body member thrust face and the nut; a reverse locking ratchet wheel is fixedly mounted on the body member at a position adjacent to the movable ratchet wheel; a control ring and a detent lock ring are provided on the outside of the movable ratchet wheel and the reverse locking ratchet wheel; the detent lock ring is provided with a plurality of elastic locking detents; the control ring is provided thereon with a plurality of control keys corresponding to the elastic locking detents; a control ring outer sleeve is provided outside of the drive sleeve and the control ring; an annular drive member is fixedly connected to the nut; the annular drive member is provided thereon with a plurality of elastic drive detents, the drive keys on the drive sleeve are connected to the annular drive member and the detent lock ring; the drive sleeve drives the annular drive member and the detent lock ring to rotate; and the control ring outer sleeve is connected to the control ring.