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US Patent: 2,555,395
Rocking Fulcrum For Adjustable and Pivotal Outer Wrench Jaws
Patentee:
Ottavio A. Capra - Jamaica, NY

USPTO Classifications:
81/104

Tool Categories:
wrenches : wrench adjustment types : screw adjust wrenches
wrenches : pipe wrenches

Assignees:
None

Manufacturer:
Stilsomatic Tool Corp. - Annapolis, MD

Witnesses:
none listed

Patent Dates:
Applied: Mar. 10, 1948
Granted: Jun. 05, 1951

Patent Pictures:
Ottavio A. Capra patent June 5, 1951
USPTO pdf tiff
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Description:
"An object of the invention is to provide a novel fulcrum for an adjustable and pivotal wrench jaw, the fulcrum including upper and lower arcuately slidable blocks, an adjusting nut positioned between the blocks, and a spring interposed between the nut and the lower block in order to prevent accidental rotation of the nut."- from the description.

The patent cites previous U.S. patent nos. 197,658, 549,221, 1,026,040, 1,143,350, 1,288,969, 1,360,672, 1,389,581, 1,602,619, 1,778,748, 2,211,507 and two foreign patents as relevant prior art.

Known example marked, "Stilsomatic Tool Corp Annapolis MD" with the patent number.

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