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US Patent: 203,261
Pipe-Wrench
Patentee:
Lawrence Glynn - Cambridgeport, MA

USPTO Classifications:
81/101

Tool Categories:
wrenches : pipe wrenches

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Henry Chadbourn
F. Allen
Alban Andren

Patent Dates:
Applied: Mar. 25, 1878
Granted: May 07, 1878

Patent Pictures:
Lawrence Glynn patent May 7, 1878
USPTO pdf tiff
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Description:
The adjustable jaw passes through a frame. The slot in which the egg-shaped adjusting ring sits is "butterfly-shaped" to allow for the slight jaw movement necessary for pipe wrenches. The spring works to release the grip.

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