US Patent: 184,445
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Improvement in drill-chucks
Collet chuck
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Patentees:
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| Charles N. Trump (exact or similar names) - Wilmington, DE |
| Samuel N. Trump (exact or similar names) - Wilmington, DE |
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Patent Dates:
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| Applied: |
Mar. 09, 1875 |
| Granted: |
Nov. 14, 1876 |
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Patent Pictures:
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The figures have been rearranged somewhat. |
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Jeff Joslin
Vintage Machinery entry for Trump Brothers
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Description: |
| The inventors contrast their design to Albert D. Goodell's US Patent No.141,345, simply by virtue of having three jaws and circular symmetry about the spindle axis, obviating any need for adjustment. An advertisement in the 1880-01-03 American Machinist features this chuck with patent date clearly visible. |
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