US Patent: 291,933
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| Wrench
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Patentee:
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| Daniel R. Porter (exact or similar names) - Randolph, MA |
| USPTO Classifications: |
| 81/99 |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jun. 25, 1883 |
| Granted: |
Jan. 15, 1884 |
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Patent Pictures:
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Daniel R. Porter patent January 15, 1884 |
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Stan Schulz
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Description: |
| The spring between the lever and main handle tends to close the swinging jaw through the intermediate linking mechanism.
The specifications note a later patent application in which the spring acts directly on the jaw (which was issued as no. 291,934). |
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