Tamper-proof fastener and a driver tool therefor

Details Tamper-proof fastener and a driver tool therefor Tamper-proof fastener and a driver tool therefor

1992-08-14

1993-12-14

Smith, James G.

Tools

Wrench, screwdriver, or driver therefor

Spanner

81461, 811211, 411188, 411910, 411919, B25B 1348

Patent

active

052692086

ABSTRACT:
A tamper-proof fastener provided with a threaded shank and a low-profile drive head integral therewith. The drive head has a generally frusto-conical shape defining a circular flat top and a circular base of larger diameter, three short noses separated 120 degrees apart projecting from the sloped side of the drive head. The fastener is installed in a substrate or withdrawn therefrom by means of a tool having a driver head provided with a complementary frusto-conical socket to accommodate the drive head of the fastener, the wall of the socket having recesses therein to receive the noses of the head whereby a torque may be applied thereto.

REFERENCES:
patent: 101207 (1870-03-01), Apgar
patent: 1397876 (1921-11-01), Meldal
patent: 2372269 (1945-03-01), Golan
patent: 3897712 (1975-08-01), Black
patent: 3935877 (1976-02-01), Franceschi
patent: 4171662 (1979-10-01), Simone et al.
patent: 4812095 (1989-03-01), Piacenti et al.
patent: 4938108 (1990-07-01), Mekler

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