Patent ID: 7118313

Claim:
A cutting die head comprising: a die body having a front face, a rear face and a hollow shank extending inwardly from the rear face and terminating in a shank end; the front face having a plurality of slots each provided with a radially adjustable block, each block having a cutter mounted thereon and a radially outwardly facing cam surface; a sleeve surrounding the die body and having an inner surface, the inner surface having a plurality of cam surfaces arranged to communicate with the cam surfaces of the blocks such that axial movement of the sleeve results in radial movement of the blocks; a plunger positioned within the hollow shank and fixed to the sleeve through a slot in the hollow shank such that the sleeve and plunger move together axially along the shank a distance delineated by the length of the slot; and a fluid in communication with the shank such that an increase in pressure of the fluid results in the plunger and sleeve being forced toward the front face of the die body, thereby causing the blocks to move radially inward.