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US Patent: 41,747
Improved Screw-Wrench
Patentee:
George C. Taft - Worcester, MA

USPTO Classifications:
81/171

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

Assignees:
Thomas H. Dodge - Nashua, NH

Manufacturer:
L. Coes & Co. - Worcester, MA
Dodge & Wellington - Worcester, MA

Witnesses:
Daniel Stratton
James H. Bancroft

Patent Dates:
Granted: Feb. 23, 1864

Reissue Information:
Reissued as RE3,483 (Jun. 01, 1869)

Patent Pictures: [ 1 | 2 ]
George C. Taft patent Feb. 23, 1864
USPTO pdf tiff
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Description:
The patent is for a "rosette" design to transfer strain from the adjusting screw to the shank of a monkey wrench. It is a refinement of the design in Taft's Nov. 10, 1863 patent 40,590. A known example incorporating these patents is marked "CHAMPION MOWER AND REAPER WRENCH // PAT ??? 1863, FEB. 23, 1864" (The November 1863 date is partially obliterated on this example.) Another known example is marked "DODGE & WELLINGTON WORCESTER // PAT"D NOV. 10, 1863 FEB. 23, 1864"

These Taft patents figured prominently in various phases of the Collins / Coes patent infringement lawsuits, and were used for the L. Coes & Co. MECHANICS WRENCH in the 1870s.

A bit of trivia: The "signature" on the drawing is entirely in the handwriting style of Thomas H. Dodge or someone in his employ -- compare a "typical" Taft signature (like the drawing for patent 40,590).

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