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US Patent: 168,166
Improvement in Pipe-Tongs
Patentee:
Alexander McDonald - Halifax, NS Canada

USPTO Classifications:
81/400, 81/426

Tool Categories:
wrenches : pipe wrenches : pipe tongs

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
A. W. Almqvist
A. F. Terry
Rufus Bayers
Jas. A. Macdonald

Patent Dates:
Applied: Aug. 28, 1875
Granted: Sep. 28, 1875

Patent Pictures:
Alexander McDonald Pat. September 28, 1875
USPTO pdf tiff
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Description:
The pivot point for the tongs is at the end of a set of intermediate links. The effective length of the links can be adjusted by a set screw, to adjust the tongs to different sizes of pipe.

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