US Patent: 530,923
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| Expansion-bit
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Patentee:
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| Reuben H. Brown (exact or similar names) - New Haven, CT |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jan. 23, 1894 |
| Granted: |
Dec. 18, 1894 |
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Jeff Joslin
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Description: |
| "My invention relates to that class of boring bits which have an adjustable cutter, usually denominated expansible bits, it being an improvement on what is known in the trade as the Clark bit of which I am now the sole owner and maker, such improvement relating more particularly to Patent 141,324, dated July 29, 1873, wherein is shown a semi-cylindrical cutter-head. Heretofore, in bits of this class having adjustable cutters, it has been difficult to hold the cutter against its seat in the cutter-head so as to prevent chips working between and thus lift the cutter therefrom. To counteract this tendency as much as possible, the cutter is usually dovetailed in the cutter-head, which is an expensive operation, besides the cutter-head is materially weakened thereby... In my improvement I construct the cutter-blade with a circular base and provide a correspondingly transverse circular seat in the cutter-head, so placed that the cutting strain will be in a direct line therewith, thus strengthening the said head, besides relieving the strain on the clamping screw." |
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