Threaded – headed fastener – or washer making: process and apparat – Process – Making internally threaded fastener – e.g. – nut
Patent
1993-12-10
1994-11-22
Larson, Lowell A.
Threaded, headed fastener, or washer making: process and apparat
Process
Making internally threaded fastener, e.g., nut
B21D 5324
Patent
active
053664140
ABSTRACT:
A prevailing torque fastener has a portion of the internal thread deformed from a circular cross-section to an approximately elliptical cross-section by a pair of die impressions on diametrically opposed sides of the exterior of the body. Each die impression is skewed from a plane normal to the axis of the fastener at an angle corresponding to the lead of the thread. Each die impression is made with a jaw having a central circular arc with a radius greater than the radius of the undeformed fastener. The opening between the jaws has a perimeter equal to the circumference of the undeformed fastener. Each edge of the die impression is at a predetermined elevation relative to the thread profile, preferably aligned with the crest of the thread. The location of the die impression is controlled by threading the fastener against a stop and crimping the fastener between jaws spaced a known distance from the stop.
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patent: 4778318 (1988-10-01), Jeal
patent: 5033924 (1991-07-01), Cosenza
Larson Lowell A.
Schoeffler Thomas C.
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