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US Patent: 444,779
Adjustable Pipe Wrench
Clarence V. Greenamyer - San Francisco, CA

USPTO Classifications:
269/236, 81/100, 81/180.1

Tool Categories:
work holding : vises : pipe and chain vises
wrenches : pipe wrenches

Verner Wrench Car Mover and Power Manufacturing Company - San Francisco, CA

Not known to have been produced

Wm. Mayer
A. M. Charlot
Otis V. Sawyer
Edward E. Osborn

Patent Dates:
Applied: Sep. 09, 1890
Granted: Jan. 13, 1891

Patent Pictures:
Clarence V. Greenamyer patent January 13, 1891
USPTO pdf tiff
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Adjustable pivot point for the hook jaw is the size adjustment. The hook jaw consists of paired pieces with a "bit" near the tip which provides additional gripping surface and compensation for work pieces of smaller diameter. Shares a double cam-faced head with Greenamyer's patent nos. 329,642 and 444,777. The bench clamp in the drawing is Greenamyer's parallel patent (no. 444,778).

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