Anti-tamper fastener

Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Externally threaded fastener element – e.g. – bolt – screw – etc. – Head driving structure

Patent

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Details

411396, 411432, 411910, F16B 2300, F16B 3506, F16B 3708

Patent

active

057305676

ABSTRACT:
A fastener including a body, a shroud rotatably mounted on the body, and a resilient retaining ring located in opposed grooves between the shroud and the body, one end of the body extending outwardly beyond the shroud, and a frustoconical outer surface on the shroud which has its larger side proximate the end of the body which extends beyond the shroud.

REFERENCES:
patent: 1899343 (1933-02-01), Mackey et al
patent: 2823725 (1958-02-01), Trinca
patent: 3978698 (1976-09-01), Ono
patent: 4037515 (1977-07-01), Kesselman
patent: 4302137 (1981-11-01), Hart
patent: 4406140 (1983-09-01), Wolter
patent: 4687392 (1987-08-01), Bidwell
patent: 4690167 (1987-09-01), Skipper
patent: 4726723 (1988-02-01), Bainbridge
patent: 4897008 (1990-01-01), Parks

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