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US Patent: 194,109
Improvement in Drill-Chucks
Patentee:
Henry L. Pratt - Brooklyn, NY

USPTO Classifications:
279/56

Tool Categories:
woodworking tools : hand drills : drill chucks

Assignees:
None

Manufacturer:
Millers Falls Co. - Millers Falls, MA

Witnesses:
E. P. Stoughton
E. H. Johnson

Patent Dates:
Applied: Mar. 30, 1877
Granted: Aug. 14, 1877

Patent Pictures: [ 1 | 2 ]
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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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