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US Patent: 491,872
Sliding Friction Tongs
Patentee:
Carlton W. Canfield - Winthrop, MN

USPTO Classifications:
294/1.1, 294/106, 81/385, 81/487

Tool Categories:
wrenches : pipe wrenches : pipe tongs

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Jesse Heller
Philip C. Masi
C. A. Benson
E. A. Campbell

Patent Dates:
Applied: Oct. 19, 1892
Granted: Feb. 14, 1893

Patent Pictures:
Carlton W. Canfield patent February 14, 1893
USPTO pdf tiff
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Description:
Pipe tongs with the set-screw adjustable pivot yoke beyond the gripping portion, similar to a nut cracker. A couple of alternate gripping surfaces are shown and described.

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