US Patent: 21,960
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| Tap for Cutting Wooden Screws
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Patentee:
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| W. O. Hickok (exact or similar names) - Harrisburg, PA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Granted: |
Nov. 02, 1858 |
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Jeff Joslin (dm)
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Description: |
| Claim primarily focuses on the addition of "... a series of minute threads, each of the same pitch as that of the reguar ... screw threads of the tap ..." to the cylindrical projection which guides the bit into the prepared hole. The aim being to ensure reliable and accurate starts for the thread cutting process. He patented a companion screw-box at the same time (21961). |
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