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US Patent: 286,653
Wrench
Patentee:
Henry Artemas Thompson - Farmington, ME

USPTO Classifications:
7/139, 81/185.1

Tool Categories:
wrenches : wrench adjustment types : screw adjust wrenches

Assignees:
None

Manufacturer:
Portland Wrench Co. - Portland, ME
Diamond Wrench Co. - Portland, ME

Witnesses:
F. L. Middleton
Walter Donaldson
Ed. P. Page
W. B. Nutter

Patent Dates:
Applied: Feb. 09, 1883
Granted: Oct. 16, 1883

Patent Pictures: [ 1 | 2 ]
H. A. Thompson Pat. Oct. 16, 1883
USPTO pdf tiff
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Description:
An improvement on Thompson's Nov. 2, 1880 patent (no. 234,091). The patent adds a friction spring inside the moveable jaw, and a detachable supplemental hammer piece. These features are not normally found on the wrenches bearing this patent date. Some wrenches were produced that match the appearance of Thompson's Canadian patent CA-13,865.

See also Canadian patent CA-21,633 for another friction spring applied to the movable jaw of this type of wrench.

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