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US Patent: 404,769
Wrench
Patentee:
Edward S. Boynton - New York, NY

USPTO Classifications:
81/120

Tool Categories:
wrenches : alligator wrenches
wrenches : pipe wrenches

Assignees:
Campbell Printing Press and Manufacturing Company - New York, NY

Manufacturer:
Not known to have been produced

Witnesses:
Francis P. Reilly
Frank L. Entwisle
John Tully

Patent Dates:
Applied: Nov. 26, 1888
Granted: Jun. 04, 1889

Patent Pictures:
Edward S. Boynton patent June 4, 1889
USPTO pdf tiff
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Description:
The invention introduces an adjustable stop into the "throat" of an alligator wrench to prevent the wrench from collapsing pipe.

This patent was not used, but Boynton's parallel patent (no. 404,770) was used in larger sizes of the BOYNTON pipe wrench.

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