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US Patent: 317,923
Amos Call - Springfield, MA

USPTO Classifications:

Tool Categories:
wrenches : pipe and nut combination wrenches

Bemis & Call Hardware and Tool Company - Springfield, MA

Not known to have been produced

H. A. Chapin
J. D. Garfield
Louis Papanti

Patent Dates:
Applied: Sep. 25, 1884
Granted: May 12, 1885

Patent Pictures:
Amos Call patent May 12, 1885
USPTO pdf tiff
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The patent describes a combination pipe and nut wrench where the movable jaws have a common adjusting nut on the central shank, and where the pipe jaw has a range of lateral motion with the jaw being forced outward by a compression spring in the body of the movable nut jaw.

In parallel patent 317,924 only one of the jaws engages with the adjustment screw.

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