Locking fastener for pivotal tool

Details Locking fastener for pivotal tool Locking fastener for pivotal tool

1988-01-28

1989-07-04

Schmidt, Frederick R.

Tools

Tool jaw

Crossed handles

81415, B25B 706

Patent

active

048439274

ABSTRACT:
Locking fasteners for pivotal tools which will not loosen during use and which apply a constant pressure between pivotal tool members. A pivot screw is provided with a holow inner bore in which a securing screw is inserted to cause binding engagement with a portion of the wall formed by the opening in which the pivot screw is inserted. In one embodiment, the securing screw causes expansion of the pivot screw shaft. In another, the securing screw actuates a compressible member which engages the wall. In the event of looseness between the two pivotal parts as a result of shock or for any other reason, the securing screw may be actuated to permit tightening or readjustment of the pivot screw.

REFERENCES:
patent: 2083483 (1937-06-01), Strezoff
patent: 2704399 (1955-03-01), Melcher
patent: 4636121 (1987-01-01), Miller

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