US Patent: 685,349


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US Patent: 685,349

Wrench

Patentee:

Frank T. Robinson (exact or similar names) - Chicago, IL

USPTO Classifications:

81/148

Tool Categories:

wrenches : wrench adjustment types : quick adjust wrenches

Assignees:

Frank T. Robinson - Chicago, IL

Morris S. Cohen - Chicago, IL

Manufacturer:

Chicago Wrench Co. - Chicago, IL

National Wrench Co. - Chicago, IL

Witnesses:

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

Patent Pictures:

Frank T. Robinson patent Oct. 29, 1901

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Description:

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.