Drill bit

Details Drill bit Drill bit

1980-12-04

1982-05-18

Hinson, Harrison L.

Cutting by use of rotating axially moving tool

Tool or tool with support

Having inversely angled cutting edge

408214, 408230, B23B 5100

Patent

active

043302297

ABSTRACT:
A drill bit having a generally cylindrical body with a working end and flutes extending along the body. The working end is formed with a central work-engaging point and a pair of slitting spurs spaced outwardly from the point adjacent edge margins of the body. Convexly contoured portions interconnect the point and spurs to permit sharpening with a round file.

REFERENCES:
patent: 72065 (1867-12-01), McGee
patent: 298786 (1884-05-01), Shaler
patent: 413972 (1889-10-01), Shaler
patent: 2230645 (1941-02-01), Jones

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