Security screw

Details Security screw Security screw

2005-01-18

2005-01-18

Thomas, David B. (Department: 3723)

Tools

Wrench, screwdriver, or driver therefor

Rigid jaws

C081S121100, C411S402000

Reexamination Certificate

active

06843153

ABSTRACT:
The present invention relates generally to a security screw (1) having threaded shank portion (2) and head portion (3). The head-portion (3) is characterized by having a circular profile with a cylindrical peripheral wall (4) and a smooth crown (5) without any tool engagement slots, recesses or other profile in contrast to a convention screw. The security screw (1) is driven into place by way of a driving tool (9) having shank portion (10) adapted to be rotated by a suitable implement such as a power drive. The driving tool (9) further comprises a cup portion (13) incorporating a cylindrical recess (14) coaxial with the shank (10). The recess (14) is sized and shaped to fit over the head portion (3) of the screw (1).

REFERENCES:
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patent: 5119956 (1992-06-01), Cioletti
patent: 5401133 (1995-03-01), Kuchler
patent: 5598753 (1997-02-01), Lee
patent: 5647253 (1997-07-01), Pozek
patent: 5904383 (1999-05-01), van der Wal
patent: 2693671 (1972-08-01), None
patent: 5215073 (1974-08-01), None

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