US Patent: 210,875
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Improvement in Drill-Chucks
Three-jaw scroll chuck with conical volute
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Patentee:
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| Elijah S. Pierce (exact or similar names) - Hartford, CT |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Mar. 22, 1878 |
| Granted: |
Dec. 17, 1878 |
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George Langford
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Description: |
| The volute normally used in a three-jaw, self-centering chuck has been reshaped into a cone so as to strengthen the scroll and also to cause the scroll to bear against the backs of the jaws closer to their centers. |
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