US Patent: 243,116
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Drill-Chuck
Optionally can function also to countersink the hole being drilled
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Patentee:
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| Augustus E. Ellinwood (exact or similar names) - Akron, OH |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
May 03, 1881 |
| Granted: |
Jun. 21, 1881 |
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Patent Pictures:
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George Langford
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Description: |
| The two, four, or more jaws are pressed against the tool-bit by screwing each of a pair of threaded rings towards the shoulders of the jaws, thereby accommodating tapered as well as straight shanks. The jaws can have projecting inclined cutting edges to enable the chuck also to act, concurrently with the drilling, as a countersink. |
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