US Patent: 879,741 - Ball-bearing drill chuck


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US Patent: 879,741

Drill-chuck
Ball-bearing drill chuck

Patentee:

Harry L. Coit (exact or similar names) - New London, CT

USPTO Classifications:

279/147, 279/61

Tool Categories:

metalworking machines : drilling and boring : drill presses : drill press chucks

woodworking machines : wood drilling and boring : drill presses : drill press chucks

Assignees:

None

Manufacturer:

Standard Machinery Co. (Mystic) - Mystic, CT

Narragansett Machine Co. - Providence, RI

Witnesses:

Charles C. Perkins

Max Jagger

Patent Dates:
Applied:	Jul. 01, 1907
Granted:	Feb. 18, 1908

Patent Pictures:

USPTO (New site tip)
Google Patents
Report data errors or omissions to steward Jeff Joslin
Vintage Machinery entry for Standard Machinery Co. (Mystic)
Vintage Machinery entry for Narragansett Machine Co.

Description:

In 1914 the Narragansett Machine Co. advertised themselves as the maker of "Coit's Ball-Bearing Drill Chuck / Tightened by hand and loosened by hand... Four sizes, the largest taking up to 3/4" drills."