US Patent: 421,020
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| Wrench For Oil Well Tools
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Patentee:
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| Dexter J. Thayer (exact or similar names) - Pittsburgh, PA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Feb. 28, 1889 |
| Granted: |
Feb. 11, 1890 |
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Patent Pictures:
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Dexter J. Thayer patent February 11, 1890 |
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Stan Schulz
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Description: |
| A power wrench for drill stem links. The power is supplied by a lever that works gear teeth in a sliding block. The gear teeth engage rack teeth on a cross-member connecting two "hook jaw" wrenches. The lever handle has a pawl to reset the handle in relation to the gear teeth as the sliding block's position changes. |
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