Drill bit

Details Drill bit Drill bit

1997-02-13

1998-09-15

Howell, Daniel W.

Cutting by use of rotating axially moving tool

Tool or tool with support

Having stepped cutting edges

408226, 408230, B23B 5102

Patent

active

058070397

ABSTRACT:
A wood drill with a point, cutting lips at the point, a shank and a body. The body having lands defining between them flutes. The flutes have a high helix reach extending from a distance from the cutting lips toward the shank, an intermediate helix reach extending from the high helix reach toward the shank and a low helix reach extending between the intermediate reach and the shank. The drill has screw threads in a peripheral surface of the lands from a point adjacent the cutting lips a distance toward the shank less than the length of the high helix reach of the flutes.

REFERENCES:
patent: 2662428 (1953-12-01), Mueller
patent: 2735116 (1956-02-01), Mueller
patent: 3665801 (1972-05-01), Gutshall
patent: 4561813 (1985-12-01), Schneider
patent: 5074728 (1991-12-01), Hau
patent: 5452971 (1995-09-01), Nevills

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