US Patent: 414,799
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| Pipe and Nut Wrench
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Patentee:
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| Bernard Donahue (exact or similar names) - Yonkers, NY |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Oct. 06, 1887 |
| Granted: |
Nov. 12, 1889 |
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Patent Pictures:
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Bernard Donahue patent November 12, 1889 |
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Stan Schulz
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Description: |
| The patent is for the gripping insert in the movable jaw. Its teeth are arranged in a "v" or diagonal, so that two or more teeth will grip the surface of pipe, which reduces the likelihood of slipping.
The Tower & Lyon "Donohue Patent" combination pipe and nut wrench used a different form of pipe gripping jaw. T&L "ENGINEER'S WRENCH" examples that include markings for this patent date refer to D19,412 - the diagonal teeth on the gripping jaw. For the earlier patents, see 195,589, 238,369, and 268,784 where Donahue appears as Donohue. |
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