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US Patent: 698,780
Chain Pipe Wrench
George Amborn, Jr. - Brooklyn, NY

USPTO Classifications:

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

J. H. Williams & Co. - Brooklyn, NY

Not known to have been produced

E. S. Jenckes
A. W. Beardsell
F. E. Bowen
C. M. Crocker

Patent Dates:
Applied: Jul. 27, 1901
Granted: Apr. 29, 1902

Patent Pictures:
George Amborn Jr. patent April 29, 1902
USPTO pdf tiff
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The head has an offset connection to the handle. This provides an open passage for the chain, which pivots from the head. The catch for the chain varies depending on whether flat or "cable" chain is used. The chain's connection to the head can also vary with an optional gimbal joint. The single gripping "head" is a feature of the AGRIPPA line of chain wrenches from Williams.

Corresponding British patent GB-190116352 was registered August 14, 1901.

The patent was improved by patent no. 773,773.

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