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US Patent: 143,367
Wrench
Patentee:
Alonzo D. McMaster - Rochester, NY

USPTO Classifications:
81/131

Tool Categories:
wrenches : wrench adjustment types : wedge adjust wrenches

Assignees:
Israel Smith - Rochester, NY
Alonzo D. McMaster - Rochester, NY

Manufacturer:
Unknown

Witnesses:
R. F. Osgood
Draper Stow
Geo. Davenport
William C. Baine

Patent Dates:
Applied: Mar. 06, 1873
Granted: Sep. 30, 1873

Patent Pictures:
Alonzo D. McMaster Patent Sept. 30, 1873 with example (courtesy photo)
USPTO pdf tiff
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Description:
There are rack teeth on the facing surfaces of the shank and movable jaw. A sliding collar wedges the parts together to hold the adjustment. The tip of the movable jaw slides into a socket in the handle.

A known example is marked only with the patent date.

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