US Patent: 525,863
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| Metal Turning Lathe
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Patentee:
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| Salmon W. Putnam (exact or similar names) - Fitchburg, Worcester County, MA |
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Patent Dates:
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| Applied: |
Apr. 08, 1892 |
| Granted: |
Sep. 11, 1894 |
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Patent Pictures:
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Joel Havens
"Vintage Machinery" entry for Putnam Machine Co.
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Description: |
| A. H. Evans & Co. - patent attorneys
Application renewed 10 Mar 1894.
The first object of my present invention is to produce a quick, handy and simple means of cutting screw-threads of both the English and metric system, and a new arrangement and combination of coarse and fine gear and belt feeds, all of which are available without stopping the lathe, or the clashing of the various movements. Another object of my invention is to produce a mechanism whereby an automatic engagement of the rack pinion is effected with the screw nut contained within the feed apron, so that both of these devices are operated and controlled by a single lever or handle.
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