Tamper-resistant fastener

Details Tamper-resistant fastener Tamper-resistant fastener

1979-04-23

1981-03-31

Britts, Ramon S.

Tools

Wrench, screwdriver, or driver therefor

Having work engaging and force exerting portion inserted...

411403, 411911, F16B 2300, B25B 1348

Patent

active

042585961

ABSTRACT:
A tamper-resistant fastener is disclosed, having a head which tends to prevent the removal of the fastener by conventional tools. The fastener head is provided with three sockets, at least one of which is eccentrically disposed with respect to the other two. The fastener may be attached and removed only with the application of a special driving tool having a male portion adapted for matable engagement with the fastener head. The eccentricity of at least one of the sockets permits the turning of the fastener upon the application of torque by the driving tool. The three-socket arrangement substantially eliminates the tendency of the driving tool to tilt when torque is applied.

REFERENCES:
patent: 1298398 (1919-03-01), Purple
patent: 2124652 (1938-07-01), Curle et al.
patent: 2338023 (1943-12-01), Bugg
patent: 2397216 (1946-03-01), Stellin
patent: 2770998 (1956-11-01), Schwartz
patent: 3369441 (1968-02-01), Kosar
patent: 3512380 (1970-05-01), Winter
patent: 3888144 (1975-06-01), Parsons
patent: 4018111 (1977-04-01), Goldhaber

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