US Patent: 491,222
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| Wrench
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Patentee:
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| Auguste Pellet (exact or similar names) - New York, NY |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Dec. 02, 1892 |
| Granted: |
Feb. 07, 1893 |
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Patent Pictures:
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Auguste Pellet patent February 7, 1893 |
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Stan Schulz
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Description: |
| The position of the adjustable jaw is controlled by incompressible fluid, based on the same principle as a hydraulic jack. The key element is two chambers in the cylindrical handle, with a valve between the chambers.
An internal compression spring will close the jaws if the release valve between the chambers is operated; the jaws would have be be opened manually with the release valve opened.
The movable jaw is equipped with a pipe gripping surface that can be swung into position. |
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