US Patent: 76,612
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Cutting Screws
Improvement in Screw-Cutting Lathes
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Patentee:
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| Charles Ellis (exact or similar names) - Canton, Norfolk County, MA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Granted: |
Apr. 14, 1868 |
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Joel Havens
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Description: |
| The object of my invention is to facilitate the cutting of the screw-threads on the ends of carriage-axles, and other similar operations, and consists:
First. In the application of two self-centring chucks arranged on a hollow spindle, in such a manner that both may be brought to bear upon the object to be centred, at pleasure.
Second. In the application of a third chuck, not self-centring, but having its jaws so arranged that they may be operated independently of each other, so that they may be adjusted to bear upon the rough or unfinished portion of the axle to clamp the same, whether it be straight or crooked,-and its contact with the axle to insure its revolution, without danger of defacing the surface of the finished portion of the axle on which the self-centring chucks act
Third. In the use, in combination with the above-mentioned centring and holding-chucks, of a revolving die-holder; and
Fourth. In the use, in combination with the above mentioned centring and holding-chucks and revolving die-holder, of a tool-post and carriage, so arranged that, when the axle is secured in the hollow spindle of the head-stock, the axle may be operated upon by the turning-tool, and the screw cut on it without removing it from the lathe.
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