US Patent: 788,483
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| Head-Stock for Engine-Lathes
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Patentees:
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| William Lodge (exact or similar names) - Cincinnati, Hamilton County, OH |
| Nicholas D. Chard (exact or similar names) - Cincinnati, Hamilton County, OH |
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Patent Dates:
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| Applied: |
May 11, 1904 |
| Granted: |
Apr. 25, 1905 |
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Joel Havens
"Vintage Machinery" entry for Lodge & Shipley Machine Tool Co.
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Description: |
| Wood & Wood, patent attorneys
Our invention relates to an improvement in the head-stock, spindle, and driving-pulley of an engine-lathe.
In the conventional type of lathe, in which the cone-pulley has a bearing upon the spindle, there are two serious defects. First, the entire upward pull or strain of the belt on the cone-pulley is transmitted to the bearings in which the spindle or live-center is journaled, thus having a constant tendency to destroy the accuracy of the live-center; second, when the ordinary back gearing is in use, the cone pulley revolves directly on the spindle at a relatively higher speed, which results in great friction and wear on the spindle. These defects have been greatly augmented since the high-speed steel has come into use in which the cone-pulley is driven at a considerably higher speed. For instance, in the conventional lathe-head it frequently happens that the driving-pulley on the spindle is revolving at an excessive speed, say at two thousand revolutions per minute, while the spindle is revolving, say, at one hundred revolutions per minute, or sometimes the ratio is as high as sixty to one. This enormous friction on the internal bore of the driving-pulley and the external periphery of the spindle is very destructive to both, and it is impossible to keep the contacting bearing-surfaces of the pulley and spindle properly oiled without frequently stopping the machine. These defects are entirely obviated in this improvement. |
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