US Patent: 725,779
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| Screw mechanism
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Patentee:
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| William L. Schellenbach (exact or similar names) - Cincinnati, OH |
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Patent Dates:
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| Granted: |
Apr. 21, 1903 |
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Jeff Joslin
Vintage Machinery entry for National Machine Tool Co.
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Description: |
| "...in an ordinary engine-lathe the accuracy of the screws produced depends upon the original and maintained accuracy of the lead-screw of the lathe. If the lead-screw be employed also for general feeding purposes, then its accuracy becomes very much impaired by wear..." This invention proposes serving these two conflicting functions of the lead-screw by using a single lead-screw with a double thread: one thread for general feeding and one for screw-cutting. |
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