Drill

Details Drill Drill

1992-12-10

1994-05-17

Howell, Daniel W.

Cutting by use of rotating axially moving tool

Tool or tool with support

Having peripherally spaced cutting edges

408227, B23B 5102

Patent

active

053122097

ABSTRACT:
A drill comprising a solid shank with a first, tip-forming end having cutting edges on opposite second end and a number of flutes corresponding to the number of cutting edges. The flutes extend from the tip end towards the other end and have the purpose of forming and conveying chips from the corresponding cutting edge. At a predetermined distance from the tip, each individual flute turns from a first, chip-forming zone with a predetermined width or cross-sectional area into a second, merely chip-conveying zone with a larger width or cross-sectional area. After having been formed in the first zone, the chips are given the possibility of dilating in the second zone, in order to facilitate chip conveyance.

REFERENCES:
patent: 390672 (1888-10-01), Holmes
patent: 472541 (1892-04-01), Johnson
patent: 750537 (1904-01-01), Hanson
patent: 2936658 (1960-05-01), Riley
patent: 4222690 (1980-09-01), Hosoi
patent: 4950108 (1990-08-01), Roos

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