US Patent: 208,059
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| Wrench
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Patentee:
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| John S. Birch (exact or similar names) - Orange, NJ |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Mar. 12, 1878 |
| Granted: |
Sep. 17, 1878 |
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Patent Pictures:
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John S. Birch patent September 17, 1878 |
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Stan Schulz
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Description: |
| The wrench is self-adjusting; the movable jaw tends to close under the pressure of a compression spring. It is held in position by a toothed cam that bears against an extension of the movable jaw. The cam has side grips to rock it back to release its grip to readjust the wrench. |
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