Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Having structure to restrict rotation of threaded – mating... – Comprising a thread lock
Patent
1980-04-18
1982-09-28
Britts, Ramon S.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Having structure to restrict rotation of threaded, mating...
Comprising a thread lock
10152T, 411411, F16B 3930
Patent
active
043516262
ABSTRACT:
A self-locking fastener combination is provided with a thread construction having a thread which deforms to securely lock the fastener when a set of male and female members are threaded together and is reformed upon unthreading of the members to allow subsequent reuse thereof. The female member is provided with a conventional thread while the male member has a special helical thread defined by leading and trailing flanks in which a portion of the leading flank diverges away from the leading flank of the female member to produce a space between the threads at the male thread root. A portion of the male thread root is truncated and is of lesser depth than the female thread such that part of the female thread crest firmly engages and is deformed by the truncated male thread root into the space adjacent such root when the members are threaded together. The deformed female thread crest produces firm metal-to-metal contact between the members completely around several revolutions of the circumference of the threads in order to preclude lateral movement of one member relative to the other and resultant loosening of the fastener when subjected to vibration. Another portion of the male thread is complementally identical to the female thread and causes the deformed female crest to reform to its original shape when the members are unthreaded, thus allowing each member to be reused.
REFERENCES:
patent: 1016897 (1912-02-01), Ryan
patent: 2377405 (1945-06-01), Davies
patent: 3247877 (1966-04-01), Evans
patent: 3721283 (1973-03-01), Evans
patent: 3731725 (1973-05-01), Brophy
patent: 3907017 (1975-09-01), Stanwick
patent: 4150702 (1979-04-01), Holmes
patent: 4171012 (1979-10-01), Holmes
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