Tools – Tool jaw – Jaw-actuating means
Patent
1982-11-19
1985-02-19
Watson, Robert C.
Tools
Tool jaw
Jaw-actuating means
81375, 81380, B25B 712
Patent
active
044997973
ABSTRACT:
A wrench includes an upper jaw integral with a handle and a force multiplying cam member pivotally mounted on the handle. A lower jaw has a pivot point for pivoting relative to the cam member and the upper jaw. A sliding bar is mounted inside the handle to slide with respect thereto. A free end of a first toggle linkage member is pivotally connected to an ear of the lower jaw and a free end of a second toggle linkage member is pivotally connected to the sliding bar so that the pivot point can move relative to the handle. A tension spring extends between the ear and the lower jaw to urge it away from the upper jaw. An extension integral with the first toggle member forms a second handle coextensive with the first handle and cooperates therewith to move the jaws toward each other as the handles are squeezed together. Such movement continues until the jaws contact an associated object. Continued squeezing of the handles causes the second toggle member to move the sliding bar back from the upper jaw. A manually actuated member can rotate the cam member into contact with the sliding bar thereby inhibiting further sliding movement thereof. Continued squeezing of the handle increases the force applied to the pivoted jaw which, in turn, applies increased rotational force to the cam member as the toggle members are moved to an over-center position to lock the wrench on the object.
REFERENCES:
patent: 2574676 (1951-11-01), Waterburg
patent: 2661648 (1953-12-01), Jones
patent: 3354759 (1967-11-01), Cook
patent: 3496808 (1970-02-01), Schmidt
Meislin Debra S.
Watson Robert C.
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