US Patent: 374,432
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| Boring-Tool
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Patentee:
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| Clarence A. Simmons (exact or similar names) - Norwood, MA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Dec. 27, 1886 |
| Granted: |
Dec. 06, 1887 |
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Patent Pictures:
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1 | 2
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Jeff Joslin (dm)
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Description: |
| Purpose is to strengthen the cutting portion of the bit by having it's periphery thicker than toward the center. It's pitch is also steepened to hasten the chips away from the cutting lip. |
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