Drill

Details Drill Drill

1990-03-21

1990-12-04

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

049750038

ABSTRACT:
A drill having a shank formed with helical or straight flutes for discharging chips therethrough and a pair of cutting edges formed at one end of the shank and extending continuously from the center of rotation of the drill to the periphery thereof. Each of the flutes is defined by a wall which is positioned rearward with respect to the direction of rotation of the drill and against which a flat plate portion of the chip formed by the portion of the cutting edge on the peripheral side is to be pressed, and by a wall positioned forward with respect to the direction for a side edge portion of the chip to come into contact with. The forward wall is inclined with respect to the rearward wall so as to prevent the chip from curling in its entirety. The drill is given improved rigidity and adapted to discharge chips as broken into fragments of suitable length.

REFERENCES:
patent: 750537 (1904-01-01), Hanson
patent: 1069930 (1913-08-01), Pawn
patent: 2769355 (1956-11-01), Crisp
patent: 2936658 (1960-05-01), Riley
patent: 4583888 (1986-04-01), Mori et al.

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