US Patent: 116,090
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| Improvement in Extension-Shanks for Boring-Bits
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Patentee:
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| William S. Pattin (exact or similar names) - Portsmouth, OH |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Granted: |
Jun. 20, 1871 |
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Jeff Joslin (dm)
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Description: |
| Combination of a "clamp dog" and moveable sleeve, driven down onto the shank of the bit by a following nut, is intended to firmly secure bits while remaining small enough in diameter to follow the bits through the hole. |
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