Combination torque release screw and screw driver

Details Combination torque release screw and screw driver Combination torque release screw and screw driver

1977-12-21

1978-08-29

Whitehead, Harold D.

Bridges

85 45, B28D 1500

Patent

active

041096916

ABSTRACT:
A threaded fastener adapted to be threaded into a workpiece only to a predetermined torque is provided which includes a pair of frangible lugs mounted on the fastener head and engageable by a specialized driving tool. The tool is used to initially engage the lugs to partially spread the latter apart and frictionally couple the driver and fastener so as to facilitate insertion of the fastener; when the fastener is fully threaded into the workpiece, excess torque applied through the driver causes the lugs to cleanly break off from the head, thus presenting a tamper-proof connection. The lugs can be mounted directly on the fastener head or on an annular mounting element frangibly secured to the head itself. The tool includes a head of generally circular cross section having a pair of radially outwardly extending cam projections which engage the fastener lugs during driving operations. In preferred forms, the tool also includes respective, planar lug-engaging faces which ensure that the fastener lugs are cleanly separated from the fastener at the completion of the driving operation.

REFERENCES:
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patent: 3695321 (1972-10-01), Garehime
patent: 3763725 (1973-10-01), Reiland
patent: 3788186 (1974-01-01), Crites
patent: 3812757 (1974-05-01), Reiland
patent: 3929152 (1975-12-01), Graham
patent: 4037515 (1977-07-01), Kesselman

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