Adjustable self locking crow foot wrench

Details Adjustable self locking crow foot wrench Adjustable self locking crow foot wrench

1984-08-07

1985-10-22

Schmidt, Frederick R.

Tools

Wrench, screwdriver, or driver therefor

Slidable jaw adjustments

81133, 81170, 81DIG3, 81DIG8, B25B 1316

Patent

active

045481040

ABSTRACT:
An adjustable, self-locking crow foot wrench comprises a support member having a pair of movable jaws. A worm adjustment member is rotatably journaled on the support member and engages rack teeth on the jaws to adjust their spacing for different size bolts. A locking element, guided for movement between the worm adjustment member and a drive-stud-receiving recess, is movable into locking engagement with the worm adjustment member in response to insertion of a drive stud into the recess. A spring moves it out of locking engagement in response to removal of the drive stud. In a two-piece embodiment, the support member is a portion of one of the jaws; in a three-piece embodiment, it is a third part.

REFERENCES:
patent: 986112 (1911-03-01), Wood
patent: 1367408 (1921-02-01), McClurkin
patent: 2358362 (1944-04-01), Taylor
patent: 2600617 (1952-06-01), Coates
patent: 2699082 (1955-02-01), Viets
patent: 2708855 (1955-05-01), Fish
patent: 2715347 (1955-08-01), Johnson
patent: 3905256 (1975-09-01), Foley
patent: 4277991 (1981-07-01), Stubenrauch

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