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US Patent: 184,445
Improvement in drill-chucks
Collet chuck
Charles N. Trump - Wilmington, DE
Samuel N. Trump - Wilmington, DE

USPTO Classifications:
279/49, 81/114

Tool Categories:


Trump Brothers - Wilmington, DE

S. McC. McPherson
T. P. Sullivan
W. W. Hollingsworth
Solon C. Kemon

Patent Dates:
Applied: Mar. 09, 1875
Granted: Nov. 14, 1876

Patent Pictures:
The figures have been rearranged somewhat.
USPTO pdf tiff
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"Vintage Machinery" entry for Trump Brothers
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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