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US Patent: 497,135
Wrench
Patentee:
John B. Shaffer - Kearney, NE

USPTO Classifications:
81/129.5, 81/146

Tool Categories:
wrenches : pipe and nut combination wrenches
wrenches : wrench adjustment types : quick adjust wrenches

Assignees:
None

Manufacturer:
Unknown

Witnesses:
Franck L. Ourand
Bennett S. Jones
C. W. Wiley
J. A. Schwartzentraub

Patent Dates:
Applied: Feb. 13, 1893
Granted: May 09, 1893

Patent Pictures: [ 1 | 2 ]
John B. Shaffer patent May 9, 1893
USPTO pdf tiff
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Description:
The movable jaw of this combination pipe and nut wrench adjusts to a number of pre-set positions by rocking against spring pressure sufficiently to allow the gripping pins to disengage from one notch and slip to another. One pin holds position with the jaws parallel for use as a nut wrench, the other pin holds position with the jaws set at an angle to each other for use as a pipe wrench.

A known example with no visible markings provides no clues to the maker's identity.

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