US Patent: 88,377
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| Chuck
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Patentee:
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| George B. Fairman (exact or similar names) - Rochester, NY |
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Patent Dates:
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| Granted: |
Mar. 30, 1869 |
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Joel Havens
"Vintage Machinery" entry for Cushman Chuck Co.
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Description: |
| The object of this invention is to make a chuck in which the jaws can be used, combined or separately, it being often desirable to use the jaws independently, so that the article being turned, may be moved out of the centre when required, without changing the chuck. This is accomplished by turning out the buttons G from the crease e, and moving out the rack A until they will enter the crease c, thereby moving it out of gear with the pinions on the shafts E, which operate the jaws. This allows any one of the jaws to be moved transversely by applying a wrench to the outer end of the pinion-shaft E. Another and great advantage in this arrangement is the rapidity with which the jaws can be moved in and out. The rack being six to one of the pinion in diameter, one turn of it moves the jaws six times as fast as can be done by applying the wrench to the pinion-shaft E, as is the case with the common chuck of this class, and when the jaws are up against the metal to be clamped, the wrench can be applied to the pinion shaft E, and power is obtained, if required, to tighten the jaws.
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