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US Patent: 542,012
Pipe Wrench
Patentee:
Charles L. Dunham (exact or similar names) - Centre View, OH

USPTO Classifications:
81/178, 81/179, 81/90.4

Tool Categories:
wrenches : pipe wrenches

Assignees:
Cochran P. Stover - Centre View, OH
Charles L. Dunham - Centre View, OH

Manufacturer:
Not known to have been produced

Witnesses:
Chas. W. Boyle
M. D. Blondel
Jerome Little
Frank Marlow

Patent Dates:
Applied: Apr. 19, 1895
Granted: Jul. 02, 1895

Patent Pictures:
Charles L. Dunham patent July 2, 1895
USPTO (New site tip)
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Description:
A form of tongs with a "wrap-around" jaw structure that pivots from the handle, and is clamped and released by lever action of the handle. The gripping bit can be removed, rotated to expose a new edge, and sharpened.

Improvement on the January 11, 1876 W. Crumbie patent no. 171,999. Dunham's later patents ( no. 656,154 on August 14, 1900 and no 705,742 on July 29, 1902) represent different approaches.

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