Patent ID: 8636287

Claim:
In a tool-bit holder of the type having a hub, wherein the hub has a longitudinally extending axial bore for receiving a tool-bit therein, a detent ball radially projecting into the bore to selectively engage the tool-bit, and a circumferential ramp that is longitudinally moveable over the detent ball to cause radial movement thereof, wherein the tool-bit holder has a distal end for receiving the tool-bit therein and a proximal end, the improvement which comprises: a longitudinally moveable member that extends through a slot in the hub and radially into the bore, wherein the circumferential ramp is moveable as a function of longitudinal movement of the moveable member relative to the hub; an inner ring disposed about the hub in coupled engagement with the moveable member, wherein the inner ring is longitudinally moveable relative to the circumferential ramp; an inner ring spring biasing the inner ring distally toward the circumferential ramp; and a sleeve spring biasing the circumferential ramp distally relative to the hub.