Metal deforming – By use of closed-die and coacting work-forcer – Forcing work into or within closed die; e.g. – forging
Reexamination Certificate
2006-08-15
2008-09-09
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, C072S355200, C083S123000, C470S021000
Reexamination Certificate
active
07421875
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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Franco James S.
Litzenberger Thomas K.
Gore Gregory J.
Michalski Sean M
PEM Management, Inc.
Peterson Kenneth E.
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