Importance

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Abstract

A differential screw adjusting mechanism comprised of an externally and internally threaded adjusting nut which has a plurality of slots formed along its length. The internal threads of the adjusting nut cooperatively and threadedly engage screw threads at the end of each of the expansion rods. The rods are in turn fixed to the lip of the die via set screws or jam nuts. A spool having an internally threaded diameter and a slot along its length is engaged to the external threads of the adjusting nut. The head of the spool has a flattened portion to limit rotation of the spool when clamped in place. Thus, the slotted adjusting nut is overfit with the slotted spool. The entire assembly of spool, nut, and rod is clamped in place via a clamping arrangement affixed to the die. The tightening of the clamp serves to close the spool via the slot over the nut, and in turn, the nut, via its slots, over the rod. A second clamp mounted on the first clamp abuts against the flattened portion of the head of the spool to limit rotation of each spool and resist reactive axial forces acting on the spool.

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First Claim