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US Patent: 1,391,179
Monkey Wrench
Edwin J. Evans - Salt Lake City, UT
George E. Hemphill - Salt Lake City, UT

USPTO Classifications:

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

Universal Tool Co. - Salt Lake City, UT

H and E Wrench Co. - New Bedford, MA


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
USPTO pdf tiff
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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).

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