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US Patent: 685,349
Frank T. Robinson - Chicago, IL

USPTO Classifications:

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

Frank T. Robinson - Chicago, IL
Morris S. Cohen - Chicago, IL

Chicago Wrench Co. - Chicago, IL
National Wrench Co. - Chicago, IL

H. S. Gaither
Ira D. Perry
F. A. Hopkins
Edna B. Johnson

Patent Dates:
Applied: Oct. 26, 1900
Granted: Oct. 29, 1901

Patent Pictures:
Frank T. Robinson patent Oct. 29, 1901
USPTO pdf tiff
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The edge of the main shank and facing inner surface of the movable jaw have fine rack teeth. A spring slide between the movable jaw and main shank acts as a wedge to set the adjustment.

Wrenches variously marked "CHICAGO WRENCH CO." and "MODEL GRIP / PAT. APL'D FOR" match this design. The MODEL GRIP wrench was announced to the hardware trade in late 1897 and early 1899.

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