US Patent: 280,259
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| Lathe
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Patentees:
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| Frank M. Stevens (exact or similar names) - Boston, Suffolk County, MA |
| Charles E. Moore (exact or similar names) - Boston, Suffolk County, MA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jan. 04, 1883 |
| Granted: |
Jun. 26, 1883 |
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Joel Havens
"Vintage Machinery" entry for D. C. Allen & Co.
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Description: |
| N. C. Lombard, patent attorney
Of interest because Frank M. Stevens took over woodworking machinery maker D. C. Allen & Co. before selling to John A. White.
Our invention relates to a lathe for turning of irregular forms, and to that class of such lathes in which the desired form is produced by the automatic movement of the cutting tool controlled by a pattern-cam attached to the arbor or revolving spindle of the lathe. It may be employed in producing a variety of work, but is especially designed for "backing off" the teeth of rotary cutters, or, in other words, in producing the necessary "clearance" required by the teeth of such circular revolving cutters. A great advantage is obtained by using the worm F and worm-wheel E as a means of imparting rotary motion to the spindle D, and through it to the work to be acted upon, over a machine in which the power is applied by means of a belt upon a pulley secured directly to the spindle, as sometimes practiced, or a machine in which spur-gear wheels are interposed between the driving pulley and the no work-carrying spindle, as in other cases is the custom. It is absolutely necessary, in performing the service intended to be performed by this machine, that the spindle D should revolve very slowly, but positively. This it is difficult, to say the least, to insure in the case of the spindle being driven by a belt acting directly upon a driving-pulley mounted upon the spindle. The use of the back gears on the head-stock of the lathe obviates this difficulty, and is all that is necessary in doing ordinary lathe-work, such as turning shafting or other circular work when a continuous chip is cut; but in doing such work as this machine is designed to do; namely, making several distinct and separate cuts to each revolution of the spindle; there is much more liability of the tool chattering, and thus making imperfect cuts, than with the worm and worm-wheel arranged as herein described, owing to the "backlash", so called, in the gear-teeth. |
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