Tamper resistant device for the application of preselected torqu

Details Tamper resistant device for the application of preselected torqu Tamper resistant device for the application of preselected torqu

1993-03-23

1994-04-05

Watson, Robert C.

Tools

Wrench, screwdriver, or driver therefor

Responsive to torque on work

81467, B25B 23153

Patent

active

052994740

ABSTRACT:
A screw can be driven home in response to the application of a preselected torque by placing over the head of the screw a tubular first section of a plastic adapter wherein the first section is connected with a polygonal second section by a frangible joint. The joint breaks in response to the application of preselected torque to the second section, and the separated second section then exposes a destructible diaphragm which is provided in the first section and overlies the head of the screw. The head can be engaged by the working end of a tool in response to at least partial destruction of the diaphragm. The first section can be of one piece with the head or it can be affixed thereto by an adhesive or is in mere frictional engagement with the head. Integrity and accessibility of the diaphragm indicate that the screw was driven home in response to the application of preselected torque as well as that the head of the screw was not tampered with subsequent to separation of the second section from the first section of the adapter.

REFERENCES:
patent: 3331267 (1967-07-01), Tietge
patent: 3595124 (1971-07-01), Lindstrand
patent: 4037515 (1977-07-01), Kesselman
patent: 4948319 (1990-08-01), Day et al.
patent: 5176050 (1993-01-01), Sauer

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