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US Patent: 357,869
Nut Wrench
Albion K. Spaulding - Belgrade, ME
Alpheus M. Spaulding - Belgrade, ME

USPTO Classifications:

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

Augusta Wrench Company - Augusta, ME

Not known to have been produced

Wilbur F. Lunt
Robert A. Davis
S. W. Bates
Thomas F. Murphy

Patent Dates:
Applied: Jul. 14, 1886
Granted: Feb. 15, 1887

Patent Pictures:
A. K. Spaulding and A. M. Spaulding patent February 15, 1887
USPTO pdf tiff
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The movable jaw is attached to a central slide with threaded edges. The internal surface of the handle is threaded; turning the handle adjusts the jaw.

A similar design produced by the Augusta Wrench Company has the movable jaw sliding in a slot in the frame, and moved by a threaded rod attached to the handle. The relevant patents are 325,942 and 376,891.

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