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US Patent: 867,639
Twist Drill
Patentee:
George J. Bragg - Newark, NJ

USPTO Classifications:
407/24, 408/223

Tool Categories:
metalworking machines : drilling and boring : drill bits : metalworking twist drills

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
H. M. Marble
Roger H. Lyon
Harry Goss
May J. Trimble

Patent Dates:
Applied: May 21, 1906
Granted: Oct. 08, 1907

Patent Pictures:
USPTO pdf tiff
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Description:
I have found that drills as ordinarily constructed, cut too wide a chip, and that the cutting efficiency of the drill can be greatly increased by dividing the chip into a plurality of narrower chips. When this is done, by means such as hereinafter described, not only does the drill cut move easily, but it may be run at higher speed and does not heat up as fast as corresponding drills of the ordinary type.

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