Patent ID: 7240594

Claim:
An apparatus for releasably holding a toolholder having a shank, the apparatus comprising: a tool support member having a bore along a longitudinal axis for receiving the shank of the toolholder; a rotatable actuating bolt positioned within a passageway through the tool support member along a radial axis (R 1 ) relative to the longitudinal axis, the passageway defining a first aperture and a second aperture to provide lateral support to the actuating bolt, the actuating bolt having a first end with a bolt locking segment having a rotatable substantially frusto-conical bolt locking surface; and an actuating nut rotatably fixed within the passageway of the tool support member and secured to a second end of the actuating bolt and having a nut locking segment having a nut locking surface, wherein the bolt locking segment and the nut locking segment are adapted to draw the toolholder into the tool support member along the longitudinal axis.