US Patent: 1,435,639
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| Countersinking Attachment For Auger Bits
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Patentee:
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| Albert Gundersen (exact or similar names) - Seattle, WA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Mar. 18, 1920 |
| Granted: |
Nov. 14, 1922 |
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Patent Pictures:
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Albert Gundersen patent November 14, 1922 |
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Stan Schulz
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Description: |
| The lower ends of the jaws extend into the grooves of the drill bit. The central portion is slightly tapered and threaded so that turning the outer adjusting nut clamps the cutting jaws in place. |
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