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US Patent: 876,926
Chain Pipe Wrench
Patentee:
George Amborn - New York, NY

USPTO Classifications:
81/70

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

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

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

Witnesses:
Eugene V. Myers
Theodore T. Snell
Phillip Bellows
Fred White

Patent Dates:
Applied: May 06, 1907
Granted: Jan. 21, 1908

Patent Pictures:
George Amborn patent January 21, 1908
USPTO pdf tiff
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Description:
The focus of this patent is the reversible double-ended jaw plates. When one set of jaw teeth is worn, the jaws can be reversed to use the other set. The chain hooks on the inner face are similar to those patented in Amborn's parallel patent no. 876,925, and differ from those in 876,927. The "double-ended" jaw pieces in the patent resemble those used in Williams' VULCAN BI-JAW chain wrenches introduced in spring, 1910.

Amborn modifications to this design to adapt it to "cable chain" are described in pat. no. 985,766.

Arthur C. Fraser & Co. - patent attorneys

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