Self-adjustable ratchet wrench

Details Self-adjustable ratchet wrench Self-adjustable ratchet wrench

1988-06-29

1990-04-03

Schmidt, Frederick R.

Tools

Wrench, screwdriver, or driver therefor

Plural pivoted jaws and handle-lever

81 911, B25B 1300

Patent

active

049130110

ABSTRACT:
A snap-fit self-adjusting ratchet wrench which has two guided jaws which move linearly against each other along a guided pin, and which are hinged to a handle by pins. The hinges on the jaw to the handle are designed with override leverage wherein the gripping force is increased as the handle is swung in forward stroke and releases in back stroke to provide ratchet action. A return spring exerts force on the jaws for an automatic snapping on the workpiece. A locking mechanism may be provided by a fastening means for retaining the guiding pin to hold the jaw opening to a fixed predetermined position.

REFERENCES:
patent: 1924393 (1933-08-01), Beery
patent: 2476369 (1949-07-01), Gutowski
patent: 2706923 (1955-04-01), Kvaerne
patent: 3044335 (1962-07-01), Keranen
patent: 3921474 (1975-01-01), Dyck et al.
patent: 4534245 (1985-08-01), Rossmann

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