Patent ID: 6074601
Filing Date: 2000-06-13
Classification: C21D

Abstract:
A quench hardening jig for a cylindrical workpiece comprising a flat shaped base member, a plurality of taper plates and an inversely tapered block, the plurality of the taper plates being disposed radiantly on the base member retractably relative to a center of said base member while each taper plate being formed such that it is substantially L shaped in its front view and an internal surface thereof is tapered, the inversely tapered block having an inversely tapered surface fitting to the tapered surface of the taper plate and being mounted on said tapered surface of the taper plate such that a progress of the inversely tapered block in a vertical direction contracts/expands an external diameter formed by the respective taper plates, each of said taper plates being slidably disposed in radial slots formed in said base member.