Security screw, driver therefor, and process

Details Security screw, driver therefor, and process Security screw, driver therefor, and process

1978-10-20

1980-04-15

Simpson, Othell M.

Bridges

145 50D, 145 50E, B25B 1500

Patent

active

041978897

ABSTRACT:
A security screw has an axially directed drive hole in its head, with the axis of that hole being coincident with the axis of the screw itself. To turn the screw in either direction, the shank of a driver is inserted into the drive hole and turned in the desired direction. The shank has at least one camming surface on it in the form of a land, and a gripping rod extends along that camming surface in the direction of the shank, the rod being generally centered with respect to the camming surface over which it lies. The arrangement is such that when the shank of the driver is turned with the gripping rod remaining generally with the screw head, the shank forces the gripping rod outwardly into snug contact with the side wall of the drive hole. Indeed, the gripping rod becomes lodged tightly between the wall of the drive hole and the shank of the driver so that the torque applied to the driver is transferred to the screw. Once the screw is tightened, a cylindrical plug may be forced into the drive hole to enhance the security afforded by the screw.

REFERENCES:
patent: 52631 (1866-02-01), Weaver
patent: 1777936 (1930-10-01), Roberts
patent: 1826988 (1931-10-01), Campbell
patent: 2301590 (1942-11-01), Signorelli
patent: 2445383 (1948-07-01), Barlow
patent: 2764886 (1956-10-01), Wiesmann
patent: 2931265 (1960-04-01), De Lacy
patent: 3044584 (1962-07-01), Thompson
patent: 3419135 (1968-12-01), Millner
patent: 3499358 (1970-03-01), Frye et al.
patent: 3674070 (1972-07-01), Mahoney

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