Tamper resistant fastener and tool for operating same

Details Tamper resistant fastener and tool for operating same Tamper resistant fastener and tool for operating same

1975-09-02

1977-04-19

Jones, Jr., James L.

Tools

Wrench, screwdriver, or driver therefor

Wheel or endless track operated

85 45, 85 50R, B26D 530

Patent

active

040181111

ABSTRACT:
A tamper resistant fastener comprising a screw having a shank portion on which a left-handed threaded surface is disposed and a head portion of a circular contour, the upper surface of which is provided with a circular bore at a location which is eccentrically disposed with respect to the longitudinal axis of the shank portion of the screw. A retainer member having a step bore that is so sized as to receive the screw such that the head portion of the screw is below the outer edge of the smaller diametered portion of the step bore. The tool comprises a handle having a driving member, the end of which terminates in a circular configuration adapted to be inserted into the step bore of the retainer into an abutting engagement with the screw head such that a coupling key carried by the end of the driving member is received within the head bore of the screw such that rotation of the handle will cause rotation of the screw about the longitudinal axis of the screw shaft, while the end of the driving member is maintained in an abutting relationship with the head of the screw. Clamping arms are carried by the tool to insure the aforementioned engagement.

REFERENCES:
patent: 256045 (1882-04-01), Poulson
patent: 1300275 (1919-04-01), Johnson
patent: 1433341 (1922-10-01), Cole
patent: 2576742 (1951-11-01), Wolny
patent: 2817377 (1957-12-01), Gate et al.
patent: 3924507 (1975-12-01), Faroni

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