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US Patent: 1,333,517
Pipe Wrench
Frederick E. Walden - Worcester, MA

USPTO Classifications:

Tool Categories:
wrenches : alligator wrenches


W-W Mfg. Co., Inc. - Worcester, MA


Patent Dates:
Applied: Mar. 21, 1919
Granted: Mar. 09, 1920

Patent Pictures:
Frederick E. Walden Pat. March 9, 1920. 8 inch example from Stan Schulz collection
USPTO pdf tiff
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The patent provides for toothed and smooth jaws at an angle to each other, in the conformation generally known as "alligator wrench." The handle is formed of a bent rod. The patent shows relatively fixed position and adjustable jaw options. The actual production wrench does not include the adjustable jaw.

Advertised as the WAL-PAT pipe wrench in 6 in., 8 in., and 10 in. sizes in 1924. The W-W Co. may be the Walden Improved Wrench Co. incorporated by F.E. Walden and four others in 1921.

Compare this to the SHAW WRENCH (Pat no. 956,280) and Walden's Oct. 13, 1914 patent no. 1,113,389.

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