US Patent: 497,135
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| Wrench
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Patentee:
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| John B. Shaffer (exact or similar names) - Kearney, NE |
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Patent Dates:
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| Applied: |
Feb. 13, 1893 |
| Granted: |
May 09, 1893 |
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Patent Pictures:
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1 | 2
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John B. Shaffer patent May 9, 1893 |
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Stan Schulz
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Description: |
| The movable jaw of this combination pipe and nut wrench adjusts to a number of pre-set positions by rocking against spring pressure sufficiently to allow the gripping pins to disengage from one notch and slip to another. One pin holds position with the jaws parallel for use as a nut wrench, the other pin holds position with the jaws set at an angle to each other for use as a pipe wrench.
A known example with no visible markings provides no clues to the maker's identity. |
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