Tools – Wrench – screwdriver – or driver therefor – Plural pivoted jaws and handle-lever
Patent
1975-05-02
1976-10-12
Smith, Al Lawrence
Tools
Wrench, screwdriver, or driver therefor
Plural pivoted jaws and handle-lever
81180B, 76114, B25B 1328, B21K 516
Patent
active
039850501
ABSTRACT:
A pivoted jaw pipe wrench having a three-arm lever which translates the swinging motion of the wrench handle to one of the two jaws for pipe-engaging purposes and is characterized by the fact that it is in the form of a laminated structure, thereby allowing it to be made thinner than the three-arm levers of previously designed similar wrenches but without sacrificing strength and consequent resistance to rupture. The space which is saved by the relative thinness of the three-arm lever allows a lever-reinforcing shroud on the wrench body to lie alongside of the lever for reinforcing purposes, the movable lever and its associated fixed shroud presenting a lever arrangement which substantially equals the transverse width of conventional one-piece cast three-arm levers for the same purpose. Ancillary features of novelty which are associated with the wrench include the provision of a pair of reaction lugs, one on the three-arm lever and one on the wrench body, such lugs replacing the separately-fashioned reaction members for the opposite ends of lever-biasing springs which are used with similar wrenches.
REFERENCES:
patent: 1826765 (1931-10-01), Gang
patent: 2407990 (1946-09-01), Lurie
patent: 2734414 (1956-02-01), Lurie
patent: 3021149 (1962-02-01), Griffin
patent: 3709073 (1973-01-01), Kurtz
Gerlach Norman H.
Smith Al Lawrence
Smith James G.
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