Theft-prevention screw fastening

Details Theft-prevention screw fastening Theft-prevention screw fastening

1977-10-28

1979-10-16

Frazier, Roy D.

Bridges

85 45, 81 90C, 145 50A, B25B 1500

Patent

active

041709187

ABSTRACT:
A nut or bolt which requires a special tool for its removal. The engaging elements of the nut or bolt and the manipulating tool consisting of matching spline ways and pins which function as splines, the matching elements being arranged in random pattern.

REFERENCES:
patent: 1447564 (1923-03-01), Norlund et al.
patent: 2316695 (1943-03-01), Jaffa
patent: 2372269 (1945-03-01), Golan
patent: 3241408 (1966-03-01), McCauley
patent: 3320783 (1967-05-01), Kerr
patent: 3821975 (1974-07-01), Haker
patent: 4027572 (1977-06-01), Burge

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