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US Patent: 651,220
Pipe Wrench
Amos W. Warnock - Boston, MA

USPTO Classifications:

Tool Categories:
wrenches : pipe wrenches : chain and strap wrenches


Warnock Mfg. Co. - Worcester, MA

S. A. Swett
A. N. Bonney
Henry W. Williams

Patent Dates:
Applied: Sep. 23, 1899
Granted: Jun. 05, 1900

Patent Pictures: [ 1 | 2 ]
Amos W. Warnock Patent June 5, 1900
USPTO pdf tiff
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WARNOCK strap wrench (1902 description) - (FLICKR)
The WARNOCK uses a fabric strap to bind around pipe. This provides a non-marring wrench for bright finish or soft metal pipe.

Many extant examples include the "triple wear" modification from Peter Monahan's Feb. 18, 1919 patent (no. 1,294,515).

In the fall of 1902, WARNOCK published a letter threatening civil action against the maker and users of the ROCO strap wrench. In reply, W.H. Rawe noted impending receipt of patent no. 714,610 and threatened civil action.

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