US Patent: 577,653
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| Chain Wrench
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Patentees:
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| William Joseph Grinden (exact or similar names) - Brooklyn, NY |
| George Amborn, Jr. (exact or similar names) - Brooklyn, NY |
| USPTO Classifications: |
| 81/70 |
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Patent Dates:
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| Applied: |
Apr. 01, 1896 |
| Granted: |
Feb. 23, 1897 |
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Patent Pictures:
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William J. Grinden and George Amborn, Jr. patent February 23, 1897 |
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Stan Schulz
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Description: |
| The specifications note that "cable chain" is preferable for working with fittings and other irregular forms related to pipe where flat chain is better suited for pipe.
The side plates connect to the handle with dovetails; the bolt's primary function is to keep the jaws in position rather than carrying the strain. The free end of the chain connects to the handle behind the attachment point for the fixed end of the chain to avoid potential for the chain to "lock" on pipe.
Williams' chain wrenches incorporated aspects of multiple patents; the Febr. 23, 97 date appears on some models of Williams' VULCAN chain wrenches.
Corresponding Canadian patent no. CA-55,988 issued May 19, 1897 provides Grinden's full name.
The specifications relate the link chain version to patent no. 499,508.
Patent no. 577,654 is a parallel patent relating to an alternate attachment pin for the fixed end of a cable chain.
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