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US Patent: 514,752
Wrench
Patentee:
Edgar A. Humphrey - Columbus, PA

USPTO Classifications:
81/180.1, 81/356, 81/363, 81/404

Tool Categories:
wrenches : pipe and nut combination wrenches
wrenches : wrench adjustment types : auxiliary levers on wrenches

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
G. S. Elliott
E. W. Johnson
Jones Smith
E. C. Barnes

Patent Dates:
Applied: Dec. 01, 1892
Granted: Feb. 13, 1894

Patent Pictures:
Edgar A. Humphrey patent February 13, 1894
USPTO pdf tiff
Google Patents
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Description:
Screw adjust pipe and nut wrench with an "over-center" clamping lever to clamp the jaws onto the workpiece.

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