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US Patent: 395,431
Improvements in Monkey Wrenches
George E. Franklin - Natick, MA

USPTO Classifications:
81/382, 81/383, 81/402

Tool Categories:
wrenches : wrench components : wrench jaw components


George E. Franklin - Natick, MA

Francis C. Stanwood
E. K. Boynton
H. E. Lodge

Patent Dates:
Applied: Apr. 23, 1888
Granted: Jan. 01, 1889

Patent Pictures:
George E. Franklin patent January 1, 1889, and Franklin*s Never-Slip Wrench
USPTO pdf tiff
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"This invention ... consists in a compound-lever attachment by which a gripping-plate pivotally affixed upon the movable jaw is to be actuated and pressed more firmly against the object to be grasped."

8, 10, and 12-inch sizes advertised in the January 1893 "Machinists' Price Current" as Franklin's Never-Slip Wrench.

A known example is the jaw and lever, separate from a wrench frame. The jaw is set up as a pipe grip rather than the smooth nut wrench jaw shown in the patent drawings.

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