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US Patent: 66,051
Improvement in Screw-Wrenches
Patentee:
Isaac H. Smith - Albany, NY

USPTO Classifications:
81/137

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

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Alexander Selkirk
George W. Smith

Patent Dates:
Granted: Jun. 25, 1867

Patent Pictures:
Isaac H. Smith Pat. June 25, 1867
USPTO pdf tiff
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Description:
The patent is a flattened or concave side on the adjusting screw. When the flat or concave side is turned toward the rack threads on the bar, the movable jaw is free to slide. The remaining adjusting thread not only holds the movable jaw but allows for some range of adjustment.

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