Cold-headed standoff

Details Cold-headed standoff Cold-headed standoff

2008-06-26

2009-12-15

Peterson, Kenneth E. (Department: 3724)

Metal deforming

By use of closed-die and coacting work-forcer

Forcing work into or within closed die; e.g., forging

C072S355200, C072S355400, C072S370100, C083S123000, C083S686000, C470S021000, C470S141000

Reexamination Certificate

active

07631532

ABSTRACT:
A process for cold forging a metal fastener such as a self-clinching standoff includes a punch and die set at the final head trimming station which produces the shear burr only on the underside of the fastener head where it is not visible after installation. A knock-out pin which is reciprocal within the bore of the punch forcibly ejects the fastener through a passage in the die to a point beyond an opposite side of the die. A stripper sleeve which is reciprocal about the outside surface of the punch then moves from a retracted position over the end of the punch pushing a residual scrap ring from around the outside of the punch.

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