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US Patent: 121,372
Improvement in Wrenches
Patentee:
Henry A. Hyle - Shamburg, PA

USPTO Classifications:
81/106, 81/99, 81/DIG.6

Tool Categories:
wrenches : pipe wrenches

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Francis McArdle
P. C. Dieterich
J. Dixon
W. A. Dixon

Patent Dates:
Granted: Nov. 28, 1871

Patent Pictures:
Henry A. Hyle Pat. Nov. 28, 1871
USPTO pdf tiff
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Description:
The hook jaw has two pivot points to adapt to a range of sizes, and a set screw limit stop to avoid crushing smaller pipe.

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