Patent ID: 7527270

Claim:
A machine tool arbor for holding a rotating machine part or workpiece fitted with an actuator member for tool-less chucking and unchucking of a machine part or workpiece, comprising: an arbor main body extending longitudinally along a longitudinal axis from a back or distal end to a front or proximate end; a collet having a radially displaceable member for chucking and unchucking a machine part or workpiece sleeved thereon, said collet having an inclined inner wall inclined toward the back end of the arbor main body that is adapted to be pushed and released from or into abutment with a matching inclined wall formed on a part of the arbor main body inclined toward the front end thereof, a collet pusher member having a longitudinally extending part coupled to said collet to move it in forward and rearward directions along the longitudinal axis of the arbor main body when said collet pusher member is moved in corresponding directions, an actuator member threaded on threads formed on an exterior surface on the back end of the arbor main body and coupled to the collet pusher member to move it in forward and rearward directions, such that when the collet pusher member is moved in the forward direction, it causes the inclined inner wall of the collet to move forward and release from the inclined wall of the arbor main body to collapse the radially displaceable member to a radially disengaged position for unchucking the machine part or workpiece, and when the collet pusher member is moved in the rearward direction, it causes the inclined inner wall of the collet to move rearward and push into engagement with the inclined wall of the arbor main body to radially expand the radially displaceable member to an engaged position for chucking of the machine part or workpiece, wherein the actuator member comprises an actuator ring or knob mounted at the back end of the arbor main body and coupled to the collet pusher member which, when rotated in one direction, causes the collet pusher member to release the machine part or workpiece that is chucked by the collet, and when rotated in the opposite direction, the actuator knob causes the collet pusher member to push the collet into abutment with the arbor main body and firmly hold the machine part or workpiece to be chucked.