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US Patent: 23,798
Wrench
Improved Double-Acting Screw and Rack Wrench.
Patentee:
George C. Taft - Worcester, MA

USPTO Classifications:
81/163

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

Assignees:
None

Manufacturer:
George C Taft - Worcester, MA

Witnesses:
James H. Bancroft
Wm. H. Taft

Patent Dates:
Granted: Apr. 26, 1859

Patent Pictures:
George C. Taft patent April 26, 1859
USPTO pdf tiff
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Description:
Taft describes this as an improvement on his May 25, 1858 patent 20,379. The double threading of the adjusting nut would accelerate the adjustment speed, and it travels on a protected shaft extending from the ferule so there is no extended "tail" as in 20,379.

Known examples have no visible markings. The patent (along with 20,379 and 23,725 was "licensed" to Daniel Hawkins, Jr. in 1859.

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