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US Patent: 1,449,386
Pipe Wrench
Patentees:
Edwin J. Evans - Salt Lake City, UT
George E. Hemphill - Salt Lake City, UT

USPTO Classifications:
81/109, 81/172

Tool Categories:
wrenches : pipe wrenches

Assignees:
None

Manufacturer:
H and E Wrench Co. - New Bedford, MA

Witnesses:
George C. Myers
W. F. Buckley, Jr.

Patent Dates:
Applied: Mar. 17, 1922
Granted: Mar. 27, 1923

Patent Pictures: [ 1 | 2 ]
E. J. Evans and G. E. Hemphill Patent March 27, 1923
USPTO pdf tiff
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Description:
The swinging hook jaw is mounted on a base which is adjusted by a shaft with spiral grooves and a slide. The same adjustment mechanism is employed in Hemphill and Evans' nut wrench (pat. no. 1,391,179, Sept. 20, 1921).

Evans continued exploring the helical screw adjustment concept in subsequent patents 1,570,627 and 1,728,282.

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