Tamper-proof threaded fastenings

Details Tamper-proof threaded fastenings Tamper-proof threaded fastenings

1988-09-22

1989-11-21

Smith, James G.

Tools

Wrench, screwdriver, or driver therefor

Rigid jaws

411429, 411910, B25B 1306

Patent

active

RE0331147

ABSTRACT:
The fastening device has a head portion with a uniform cross section, the uniform cross section having a plurality of non-uniform indentations. A matching socket wrench is provided having an internal cross section matching the exterior cross section of the fastening for tightening or loosening the fastening. The invention is particularly useful for preventing unauthorized removal of automobile wheels.

REFERENCES:
patent: 529683 (1894-11-01), Herman
patent: 1447564 (1923-03-01), Norland et al.
patent: 2040383 (1936-05-01), Jasper
patent: 2372269 (1945-03-01), Golan
patent: 3222976 (1965-12-01), Holman
patent: 3482481 (1969-12-01), Newell et al.
patent: 3631757 (1972-01-01), Perkin
patent: 3695124 (1972-10-01), Myers
patent: 3763725 (1973-10-01), Reiland
patent: 3908489 (1975-09-01), Yamamoto et al.
patent: 3930428 (1976-01-01), Hale
patent: 4018133 (1977-04-01), Chaivre et al.
patent: 4027572 (1977-06-01), Burge
patent: 4521146 (1985-06-01), Wharton
1979 American Accessories Catalog (Effective Dec. 1, 1978), Cover Sheet and p. 5.

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