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US Patent: 389,899
Pipe Wrench
Patentee:
Daniel R. Porter (exact or similar names) - Chelsea, MA

USPTO Classifications:
81/146, 81/92

Tool Categories:
wrenches : wrench adjustment types : quick adjust wrenches
wrenches : pipe wrenches

Assignees:
None

Manufacturer:
Porter Mfg. Co. - Revere, MA

Witnesses:
W. P. Ricker
J. George Seltzer
L. W. Howes
E. Planta

Patent Dates:
Applied: Sep. 08, 1887
Granted: Sep. 25, 1888

Patent Pictures: [ 1 | 2 ]
Daniel R. Porter Patent. September 25, 1888
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Description:
A rack on the main bar, a tooth at the base of the adjustable jaw, and two mountings with compression springs are the major features of this quick-adjusting pipe wrench. Known examples marked only with the patent date, and have leaf springs instead of the compression coil springs shown in the patent drawings.

Corresponding Canadian patent CA-27,657 and subsequent foreign patents ( Canadian patent CA-30,994 and British patent GB-188901609 ) provide suggestions for intermediate or alternate manufacturers.

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