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1. In a metal forming die having first and second die members mounted a spaced apart distance for reciprocation between converged and diverged positions, the improvement of a guided keeper assembly, comprising:
a base having:
a generally cylindrically shaped, rigid body with a central aperture extending axially through a central portion of said base;a head portion with a plurality of tool engaging flats disposed about the margin of said head portion and configured for axially rotating said base relative to said first die member;a mounting portion disposed opposite said head portion and having an external thread detachably received and securely retained in a first threaded aperture in said first die member;a scalloped shoulder portion disposed axially between said head portion and said mounting portion, and including a plurality of arc-shaped, radially outwardly opening notches disposed about the margin of said scalloped shoulder portion;a retainer ring groove disposed axially between said scalloped shoulder portion and said head portion; a guide pin having:
a cylindrically shaped central portion closely received in said central aperture in said base for precisely guiding reciprocal motion between said first and second die members;a first end having an enlarged head shaped to abut said base to positively limit travel between said first and second die members; anda second end, positioned opposite said first end, and having a locator portion that engages said second die member, and precisely locates said second end of said guide pin on said second die member; a socket head cap screw having a threaded shank portion detachably received and securely retained in a second threaded aperture in said first die member at a location adjacent to said first threaded aperture, and a generally cylindrically shaped head portion with an exterior end face and an outside peripheral surface which mates with said arc-shaped notches in said scalloped shoulder portion of said base; a retainer ring detachably received and securely retained in said retainer ring groove in said base, and having an interior face disposed over at least a portion of said exterior end face of said head portion of said cap screw, whereby engagement between said outside peripheral surface of said head portion of said cap screw and an associated one of said arc-shaped notches in said scalloped shoulder portion of said base in which the same is received positively prevents said base from unintentionally unfastening from said first threaded aperture in said first die member, and engagement between said exterior end face of said head portion of said of said cap screw and said interior face of said retainer ring positively prevents said cap screw from unintentionally unfastening from said second threaded aperture in said first die member. |
