Security screw

Details Security screw Security screw

1977-08-11

1979-10-23

Foss, J. Franklin

85 9R, F16B 2300

Patent

active

041716620

ABSTRACT:
A screw having its head shaped to prevent its removal by unauthorized persons, characterized in that it has peripherally thereof an odd number of sides arranged symmetrically with respect to the center of the head and inclined to the axis of the screw to prevent removal of the screw by the use of pliers. The screw is removed by the use of a matching socket wrench.

REFERENCES:
patent: 131843 (1872-10-01), Brooks
patent: 2770998 (1956-11-01), Schwartz
patent: 3929152 (1975-12-01), Graham

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