US Patent: 1,391,179 - Monkey Wrench


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US Patent: 1,391,179

Monkey Wrench

Patentees:

Edwin J. Evans (exact or similar names) - Salt Lake City, UT

George E. Hemphill (exact or similar names) - Salt Lake City, UT

USPTO Classifications:

81/172

Tool Categories:

wrenches : wrench adjustment types : quick adjust wrenches

wrenches : nut wrenches

Assignees:

Universal Tool Co. - Salt Lake City, UT

Manufacturer:

H and E Wrench Co. - New Bedford, MA

Witnesses:

Unknown

Patent Dates:
Applied:	Dec. 30, 1920
Granted:	Sep. 20, 1921

Patent Pictures: [ 1 | 2 ]

Edwin J. Evans and George E. Hemphill patent Sept. 20, 1921

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Description:

The slide drives a "steep pitch" spiral groove on a shaft. A shallower pitch set of grooves on the shaft move the adjustable jaw.

Hemphill was the "money man" in the Hemphill / Evans partnership and moved to Boston from Salt Lake City. The wrenches are strongly made. The adjusting mechanism was also used in a pipe wrench patented March 27, 1923 (pat. no. 1,449,386).