US Patent: 194,109
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| Improvement in Drill-Chucks
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Patentee:
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| Henry L. Pratt (exact or similar names) - Brooklyn, NY |
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Patent Dates:
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| Applied: |
Mar. 30, 1877 |
| Granted: |
Aug. 14, 1877 |
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Patent Pictures:
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1 | 2
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Jeff Joslin (dm)
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Description: |
| Pratt summarizes the claims for this patent:
"The combination of the slotted body A and shell D, secured rigidly thereon, with the jaws CC, capable of free and independent movement in the slot a, and screw-threaded spindle B, which acts against the bases of the jaws, and closes them by forcing them forward and their inclined sides against the shell D ... ."
Figure 6 (jpg 2) purports to show how the loose jaws allow this chuck to also grip tapered square bit tangs.
A known example, mounted on an archimedean drill, is marked:
MILLERS FALLS CO.
PAT'D AUG 14, 1877 |
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