Tools – Wrench – screwdriver – or driver therefor – Slidable jaw adjustments
Patent
1990-02-20
1991-09-17
Schmidt, Frederick R.
Tools
Wrench, screwdriver, or driver therefor
Slidable jaw adjustments
81155, 81129, B25B 1316
Patent
active
050483803
ABSTRACT:
An adjustable wrench has a stationary jaw formed at an end of a handle. A slidable jaw is mounted for linear reciprocal movement toward and away from the stationary jaw by a worm gear in mesh with a gear rack on the slidable jaw. An axially movable shaft extends through the worm gear. The worm gear is rotatably mounted on the shaft, and restrained against axial movement relative thereto. An inner end of the shaft is slidably received in a recess in the handle, and a coil spring in the recess outwardly biases the shaft. A lever has a first end pivotally mounted to an outer end of the shaft and an intermediate portion pivotally secured to the handle. The slidable jaw may be moved by rotation of the worm gear to a loosely adjusted position and may be firmly tightened into engagmeent with the head of a fastener by manipulation of the pivotal lever. The wrench allows extremely quick engagement and release with the head portions of various fasteners.
REFERENCES:
patent: 1490903 (1924-04-01), Anderson
patent: 2112193 (1938-03-01), Geddes
patent: 2534985 (1950-12-01), Napier
patent: 3564956 (1971-02-01), Landen
patent: 3659485 (1972-05-01), Roth
patent: 3926077 (1975-12-01), Nordgren
Cruz Lawrence
Kearns Jerry T.
Schmidt Frederick R.
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