US Patent: 277,859
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Countersink For Bits
Countersinks for Chamfering Bits and Drills
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Patentee:
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| Richard J. Welles (exact or similar names) - Chicago, IL |
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Patent Dates:
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| Applied: |
Aug. 17, 1882 |
| Granted: |
May 15, 1883 |
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Patent Pictures:
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Richard J. Welles patent May 15, 1883 |
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Stan Schulz
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Description: |
| The collar of this adjustable countersink would clamp onto any drill bit within its size range. The cutters slide into slots in this collar and also are interposed between the drill bit and the set screws. This means the cutters are easily lost when the countersink is not clamped to a drill bit.
A known incomplete example is marked only with the patent date. |
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