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US Patent: 178,902
Pipe-Wrench
Patentee:
Thomas Booth - Toronto, ON Canada

USPTO Classifications:
81/110, 81/412

Tool Categories:
wrenches : pliers type wrenches
wrenches : pipe wrenches : pipe tongs

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Harry Warren
William Sandford
Geo. A. Aird

Patent Dates:
Applied: Feb. 25, 1876
Granted: Jun. 20, 1876

Patent Pictures:
Thomas Booth Pat. June 20, 1876
USPTO pdf tiff
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Description:
The pivot pin for the movable jaw has two flat faces which allow it to be moved between a series of circular notches in a flattened block incorporated in the main bar. The flats are located so that the jaw can be shifted when swung back. This adjustment provision is described with a swinging hook jaw, and with an elongated "tongs" handle.

The version with the swinging hook jaw is substantially the same as the one covered by Canadian patent no. CA-5344 issued November 2, 1875.

The elongated slot with circular notches and flattened pivot pin is a feature found in some types of "water pump pliers."

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