US Patent: 456,265
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| Wrench
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Patentee:
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| Samuel Boothroyd (exact or similar names) - Amesbury, MA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Aug. 11, 1890 |
| Granted: |
Jul. 21, 1891 |
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Patent Pictures:
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Samuel Boothroyd patent July 21, 1891 |
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Stan Schulz
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Description: |
| The shank is cylindrical with four longitudinal grooves. The base for the head turns on the cylindrical shank, and has a set screw to engage one of the grooves on the shank to hold adjustment. The head may have either a hook jaw for pipe, or a flat jaw for nuts, and the facing end of the shank likewise may have a flat end for nuts, or some form of gripping surface for pipe. |
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