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US Patent: 95,744
Improvement in Pipe-Wrenches
Daniel Chapman Stillson - Charlestown, MA

USPTO Classifications:

Tool Categories:
wrenches : pipe wrenches


J. J. Walworth & Co. - Cambridge, MA
Walworth Mfg. Co. - Boston, MA

W. W. Mosher
Joseph H. Cotton

Patent Dates:
Applied: Sep. 11, 1869
Granted: Oct. 12, 1869

Patent Pictures: [ 1 | 2 ]
D.C. Stillson Pat. Oct. 12, 1869 -- with 6 inch example marked D.C. STILLSON PAT. OCT. 12, 1869 WALWORTH MFG. Co. BOSTON
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Stillson's pipe wrench has teeth on both the fixed jaw and adjustable jaw. The adjusting knurl is housed in a pivoted frame which allows the teeth to grip pipe without "locking." The patent was improved by Stillson in subsequent patents issued Sept. 13, 1870 (no.107,304), and April 30, 1872 (no 126,161), and by C.C. Walworth in 1882 (no. 262,263).

The mechanical principles of this design were used as the basic assumption for a multitude of subsequent pipe wrench designs.

Corresponding British patent GB-187001227 was granted April 28, 1870.

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