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US Patent: 1,122,335
Pipe Wrench
William S. Thomson - Plantsville, CT

USPTO Classifications:

Tool Categories:
wrenches : pipe wrenches

H. D. Smith and Company - Plantsville, CT

H. D. Smith and Company - Plantsville, CT

G. R. Bond
E. H. Galpin
R. W. Edwards
H. C. Kingsley

Patent Dates:
Applied: Nov. 01, 1913
Granted: Dec. 29, 1914

Patent Pictures: [ 1 | 2 ]
William S. Thomson patent Dec. 29, 1914 - with 1920 ad for No. 643 pipe wrench
USPTO pdf tiff
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The primary patented feature is the protected location of the spring that pushes the hook jaw into engagement with the work piece. The side pieces of the rocking frame extend far enough to cover the spring whatever the position of the jaw.

The main handle is made by drop forging; pat. no. 1,118,073 describes the process of forming the hook jaw.

The rocking frame and spring in the WINCHESTER pipe wrench (pat. no. 1,409,672) are quite similar.

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