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US Patent: 618,313
Pipe and Nut Wrench
Patentee:
August H. Adams - Piqua, OH

USPTO Classifications:
81/397, 81/424.5

Tool Categories:
wrenches : pipe wrenches : pipe tongs

Assignees:
None

Manufacturer:
A. H. Adams - Piqua, OH

Witnesses:
Wm. H. Gilbert
Z. Frank Martin
Leonard H. Shipman

Patent Dates:
Applied: May 25, 1898
Granted: Jan. 24, 1899

Patent Pictures:
August H. Adams patent January 23, 1899, with pictured example
USPTO pdf tiff
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Description:
The adjustable jaw is attached to a threaded pivot block with a slight range of motion; the adjustment is accomplished by screwing the shank in or out.

The handle and fixed jaw are two pieces riveted together in the production tool rather than the single piece shown in the patent drawing.

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