Drill bit with debris conveying flute

Details Drill bit with debris conveying flute Drill bit with debris conveying flute

1995-08-10

1997-06-24

Neuder, William P.

Boring or penetrating the earth

With tool shaft detail

Helix or helically arranged structure

175394, 408230, E21B 1000

Patent

active

056410280

ABSTRACT:
A cutting tool or drill bit (10) has a shank (12) with two ends. A chucking end (14) is on one end of the shank (12) and a cutting end (16) is on the other end of the shank (12). At least one flute (30) is formed on the shank (12) between the chucking (14) and cutting ends (16). The flute (30) includes a web (36) and a debris channel (32). The web (36) includes a first (38) and second (40) surface continuous with a debris channel side wall (34). The first surface (38) is substantially parallel to the shank longitudinal axis (18) and the second surface (40) is on an angle from about 100.degree. to about 120.degree. with respect to the shank longitudinal axis (18). The second surface forms the base of the debris channel or groove (32) with the debris channel side wall (34). The debris channel side wall (34) is on an angle from about 10.degree. to about 20.degree. with respect to the shank longitudinal axis (18). A ratio exists between the axial length of the first surface to the axial length of debris channel surface of about 2:1 to about 4:1. Also disclosed is a method of cold rolling a blank (60) to form the above drill bit (10).

REFERENCES:
patent: 335469 (1886-02-01), Moreau
patent: 3749189 (1973-07-01), Boehm
patent: 4210215 (1980-07-01), Peetz et al.
patent: 4286677 (1981-09-01), Guex
patent: 4549616 (1985-10-01), Rumpp et al.
patent: 4579180 (1986-04-01), Peetz et al.
patent: 4696355 (1987-09-01), Haussmann
patent: 4765419 (1988-08-01), Scholz et al.
patent: 4967855 (1990-11-01), Moser

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