US Patent: 289,506
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Wrench
Socket Wrench With Expansion-Jaws
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Patentee:
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| James Davidson (exact or similar names) - Central City, CO |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Apr. 27, 1883 |
| Granted: |
Dec. 04, 1883 |
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Patent Pictures:
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James Davidson patent December 4, 1883 |
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Stan Schulz
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Description: |
| The outer sleeve rotates the sliding loop carrying the top of the jaws. The top of the rotating sleeve is either formed with flats to be turned by a secondary wrench, or with holes for insertion of a rod handle. The drawing shows the rod handle version. The jaws are spread apart by a compression spring, and closed by the taper of the outer sleeve.
The specifications describe it as useful for the square shafts of water stops. An alternate tri-cornered jaw form for hex nuts is also described. |
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