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US Patent: 562,878
Pipe Wrench
Patentee:
Edward Wright - Worcester, MA

USPTO Classifications:
81/93

Tool Categories:
wrenches : pipe wrenches

Assignees:
None

Manufacturer:
Edward Wright - Worcester, MA
Peck, Stow & Wilcox Co. - Southington, CT

Witnesses:
Charles S. Brown
Saml. R. Barton
Chas. H. Burleigh
Ella P. Blenus

Patent Dates:
Applied: Jan. 10, 1896
Granted: Jun. 30, 1896

Patent Pictures: [ 1 | 2 ]
Edward Wright patent June 30, 1896
USPTO pdf tiff
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Description:
The movable jaw has a rocking section with a spring holding the gripping surface out from the shank. The arrangement allows for sufficient movement for the jaws to grip pipe, without proceeding so far as to crush the pipe.

Compare this to John C. Speirs' Dec. 26, 1899 patent no. 639,785.

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