Patent ID: 8601918
Filing Date: 2013-12-10
Classification: B23B,F16B,Y10T

Abstract:
1. A toolholder assembly for releasably holding a toolholder, the toolholder assembly comprising: a toolholder having a tubular shank on a rearward side thereof, the tubular shank having at least two circumferentially spaced perforations formed therein extending between an inner surface of the tubular shank and an outer surface of the tubular shank; a tool support member having a forwardly facing surface and a bore intersecting the forwardly facing surface and adapted to receive the tubular shank of the toolholder therein, the bore extending rearward from the forwardly facing surface along a longitudinal axis; a canister disposed within the bore of the tool support member, the canister including a longitudinal passageway and at least two circumferentially spaced apertures formed therein; a lock rod at least partially disposed within the longitudinal passageway of the canister and movable within the tool support member in a rearward and forward reciprocating motion for pulling the tubular shank of the toolholder rearward within the bore into a locked position and for releasing the tubular shank of the toolholder from the bore to an unlocked position; and at least two locking elements disposed within the spaced apertures of the canister and engaging the lock rod so that movement of the lock rod causes the locking elements to extend radially outward from the canister into the circumferentially spaced perforations of the tubular shank to engage the tubular shank of the toolholder, wherein the circumferentially spaced perforations of the tubular shank of the toolholder each include a primary cylindrical wall and a forward facing contact surface at least partially defined by a depression having a converging wall surface non-concentric with the primary cylindrical wall of the perforations of the tubular shank.