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

1987-12-11

1989-05-09

Schmidt, Frederick R.

Tools

Wrench, screwdriver, or driver therefor

Having work engaging and force exerting portion inserted...

B25B 702

Patent

active

048278114

ABSTRACT:
A tamper-resistant torque-responsive fastener is provided having a head and a shank, wherein the head is provided with a socket therein having a substantially triangular shape with rounded corners and curved sides, each of the rounded corners being defined by an arcuate path of a first radius and each curved side generally opposite the rounded corner being defined by the arcuate path of a second radius, whereby the dimensions across the socket remain constant and equal to the sum of the first and second radii. The second radius is of greater length than the first radius and is preferably between 2 and 4 times as long as the first radius. Also provided is a driving tool for operating the fastener.

REFERENCES:
patent: 755804 (1904-03-01), Smith
patent: 2397216 (1946-03-01), Stellin
patent: 2770998 (1956-11-01), Schwartz
patent: 3213719 (1965-10-01), Kloack
patent: 4258596 (1981-03-01), Bisbing
Rothbart, Mechanical Design and Systems Handbook., McGraw-Hill (1964); pp. 27-15.

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