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US Patent: 228,437
Monkey Wrench
Patentee:
Stephen H. Bellows - Athol, MA

USPTO Classifications:
81/156

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

Assignees:
None

Manufacturer:
Standard Tool Co. - Athol, MA
Athol Machine Co. - Athol, MA

Witnesses:
Alvin Houghton
Charles Wadsworth
R. F. Gaylord
Lewis Sperry

Patent Dates:
Applied: Jun. 11, 1879
Granted: Jun. 08, 1880

Patent Pictures: [ 1 | 2 ]
Stephen H. Bellows Pat. June 8, 1880
USPTO pdf tiff
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Description:
(W. E. Simonds - patent attorney). The spring-loaded adjustment release allows for quick adjustment. The threads are wedge-shaped in cross section. These are well-made wrenches. The six-inch size with solid steel handles rather than the wood handles shown in the patent drawing are most common. Larger sizes with wood handles are known.

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