US Patent: 206,067
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| Feed Screw and Nut For Rock Drills, etc.
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Patentee:
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| Robert Allison (exact or similar names) - Port Carbon, PA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jun. 27, 1878 |
| Granted: |
Jul. 16, 1878 |
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Patent Pictures:
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Robert Allison patent July 16, 1878 |
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Stan Schulz
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Description: |
| The patent is for a feed screw mechanism with adjustment provisions to compensate for wear. The wrench is described in the specifications and shown in the drawing. |
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