US Patent: 3,288,001
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| Chain Wrench
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Patentee:
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| Jonathan L. Laird, Jr. (exact or similar names) - Coatesville, PA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jun. 08, 1964 |
| Granted: |
Nov. 29, 1966 |
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Patent Pictures:
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Jonathan L. Laird, Jr. patent November 29, 1966 |
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Stan Schulz
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Description: |
| The special chain can safely grip pipe included the threaded portion without distorting the pipe or deforming the pipe surface. It will also grip hexagonal or square nuts or other irregular forms. The patent includes special friction devices on the wrench to provide a ratchet-like action.
Used together with pat. no. 4,138,910 in the GRIP-IT chain wrench.
The specifications cite three European patents and U.S. patents 1,316,875 and 2,665,604 as references. |
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