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US Patent: 278,265
Wrench
Patentee:
Daniel R. Porter (exact or similar names) - Randolph, MA

USPTO Classifications:
81/127

Tool Categories:
wrenches : wrench adjustment types : self-adjust wrenches

Assignees:
Daniel R. Porter - Randolph, MA
John A. Whipple - Boston, MA

Manufacturer:
Not known to have been produced

Witnesses:
Bernice J. Noyes
F. A. Powell
Jos. P. Livermore
Patent Dates:
Applied: Mar. 30, 1883
Granted: May 22, 1883

Patent Pictures:
Daniel R. Porter patent May 22, 1883
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Description:
This self-adjusting wrench design is very basic. A lobe on the sliding jaw mates with a socket on the handle.

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