MANUAL TIGHTENED CHUCK

摘要

A manually tightened drill chuck has a split nut (7) mounted in a close manner in a front sleeve (10) ; jaws (9) , on whose respective radial outer surfaces there are formed threaded portions engaging with the split nut , are received in associated bores in a body member (1) of the chuck ; the jaws can be caused to reciprocate synchronously through rotating the front sleeve ; a rear sleeve (2) causes itself not to rotate relative to the body member of the chuck by using keys (11) arranged around the periphery of the rear portion of the body member of the chuck ; an axial thrust bearing (6) and a spring (4) are provided between the front and the rear sleeves for isolating the relative rotation of the front and rear sleeves , and are functional when the jaws chuck the drill to exert an additional chucking force .