Security nut, bolt and screw

Details Security nut, bolt and screw Security nut, bolt and screw

2006-05-30

2006-05-30

Thomas, David B. (Department: 3723)

Tools

Wrench, screwdriver, or driver therefor

Rigid jaws

C411S402000

Reexamination Certificate

active

07051624

ABSTRACT:
A security screw fastener, e.g. a nut or bolt having a head (3) around which is a curved exterior surface (5) which is at least partially conical or dome-shaped on which several left-handed and right-handed grooves (12, 13) are formed which are designed to receive a projection (31) from an interior surface (30) of a co-operating tool (20).

REFERENCES:
patent: 3134292 (1964-05-01), Walton
patent: 3302672 (1967-02-01), Walton
patent: 3482481 (1969-12-01), Newell et al.
patent: 4128038 (1978-12-01), Urwin
patent: 4171662 (1979-10-01), Simone et al.
patent: 4938108 (1990-07-01), Mekler
patent: 5381709 (1995-01-01), Louw
patent: 5598753 (1997-02-01), Lee
patent: 6024522 (2000-02-01), Bainbridge et al.
patent: 6341927 (2002-01-01), Hampson et al.
patent: 6843153 (2005-01-01), Rawson-Harris
patent: 3921874 (1989-11-01), None
patent: 2 169 978 (1986-07-01), None
patent: 2169978 (1986-07-01), None
patent: 2 171 040 (1986-08-01), None

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