Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Having structure to restrict rotation of threaded – mating... – Comprising a thread lock
Patent
1993-03-05
1994-04-12
Lindsey, Rodney M.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Having structure to restrict rotation of threaded, mating...
Comprising a thread lock
411282, F16R 3922
Patent
active
053020677
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.
REFERENCES:
patent: 2754871 (1956-07-01), Stoll
patent: 3065983 (1962-11-01), Flumerfelt
patent: 3441073 (1969-04-01), Johnson
patent: 3583052 (1971-06-01), Herbenar et al.
patent: 3952785 (1976-04-01), Werner
patent: 4778318 (1988-10-01), Jeal
patent: 5033924 (1991-07-01), Cosenza
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