Threaded – headed fastener – or washer making: process and apparat – Process – Making headed fastener – e.g. – rivet or nail – etc.
Reexamination Certificate
2007-02-13
2007-02-13
Tolan, Ed (Department: 3725)
Threaded, headed fastener, or washer making: process and apparat
Process
Making headed fastener, e.g., rivet or nail, etc.
C470S031000, C470S152000, C470S153000
Reexamination Certificate
active
11306008
ABSTRACT:
A method of head trimming a fastener blank in a cold-forging process comprises placing a fastener blank into a bore of a punch having an end face; supporting an underside of a head portion of the fastener blank with the punch end face; moving a die having an internal passage and a trim plate with a cutting edge toward the fastener blank; shearing the head of the fastener blank with the cutting edge of the trim plate; stopping movement of the die at an extended trim position where the cutting edge lies beyond an underside of the head portion of the fastener blank; ejecting the fastener blank from the punch bore and through the die passage to an opposite side of the die; retracting the die; and removing a scrap ring from around the punch by a stripper sleeve.
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Franco James S
Litzenberger Thomas K
Gore Gregory J.
PEM Management, Inc.
Tolan Ed
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