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US Patent: 70,005
Improvement in Wrenches
Patentee:
Benjamin S. Lawson - Brooklyn, NY

USPTO Classifications:
81/154

Tool Categories:
wrenches : wrench components : wrench jaw components
wrenches : wrench components : wrench handle components

Assignees:
None

Manufacturer:
Unknown

Witnesses:
William F. McNamara
Alex. F. Roberts
Theo Tusche
Wm. Svurn

Patent Dates:
Granted: Oct. 22, 1867
Antedated: Oct. 19, 1867

Patent Pictures: [ 1 | 2 ]
Benjamin S. Lawson patent October 19, 1867
USPTO pdf tiff
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Description:
The movable jaw has a threaded tongue extending through a slot in the main shank with a nut on the back side of the shank. The shank tapers with the slender end toward the fixed jaw so that pressure on the movable jaw is resisted by the "swell" of the shank.

Ken Cope's "American Wrench Makers 1830-1930" cites an 1868 "Scientific American" ad listing this patent for sale. It is shown in an 1870 WALWORTH catalog as TRIPP's TIGHT GRIP WRENCH.

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