US Patent: 251,686
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| Boring-machine
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Patentee:
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| Benjamin F. Allen (exact or similar names) - Boston, MA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Oct. 06, 1881 |
| Granted: |
Jan. 03, 1882 |
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Jeff Joslin
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Description: |
| "This invention relates to an improvement in that class of boring-machines used for the purpose of forming tapering holes that enlarge as they increase in depth, thus giving a dovetailed section, which is of great utility in the operation commonly known as 'doweling', which consists in the uniting of two or more pieces of wood by pins that enter a part of their length into each piece. In order to make a stronger joint, these are frequently provided with wedges in each end, which expand that part of the pin and causes it to retain a much strong hold upon the parts which it unites." |
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