Patent ID: 7185895

Claim:
A chuck for equipping a rotary machine comprising a body intended to be fixed to a drive shaft of the machine, in which there are mounted several jaws which slide in bores converging forward and which each have an outwardly facing threaded part, a sleeve being pivotably mounted on the body and having an interior wall which collaborates with a nut, wherein the nut is engaged with the threaded exterior part of the jaws, wherein the body comprises, in its region covered by the nut, a peripheral set of teeth and the nut has a locking mechanism fixed thereon which is intended to engage in the set of teeth of the body when the chuck is in the tightened position, and wherein the interior wall of the sleeve is in contact with the locking mechanism such that the sleeve collaborates with the nut via the locking mechanism, and wherein the sleeve has an angular relative movement with respect to the locking mechanism between an unlocked position in which the sleeve turns the nut via the locking mechanism and a locked position in which the chuck is in its tightened position.