Drill bit

Details Drill bit Drill bit

2002-06-06

2009-06-02

Bagnell, David J (Department: 3676)

Boring or penetrating the earth

Bit or bit element

Impact or percussion type

C175S419000, C175S323000

Reexamination Certificate

active

07540341

ABSTRACT:
A drill bit of the present invention is intended to stably perform drilling by lessening a great change in a drilling condition and to avoid reduction of a drilling efficiency even when large chip lumps are generated. In the drill bit, the main cutting blades have main cutting edges each structured such that an inner end thereof is located at the rotation center of the drill and an outer end thereof is located on an outer periphery of a rotation trace of the cutting blades, and the sub cutting blades have sub cutting edges each structured such that an inner end thereof is located to be spaced radially outward apart from the rotation center and an outer end thereof is located to be spaced radially inward apart from the outer periphery of the rotation trace toward the center of rotation.

REFERENCES:
patent: 4294319 (1981-10-01), Guergen
patent: 6868924 (2005-03-01), Haussmann et al.
patent: 2002/0108789 (2002-08-01), Schautt
patent: 2003/0188895 (2003-10-01), Osawa et al.
patent: 01-204705 (1989-08-01), None
patent: 2001-121529 (2001-05-01), None
Inernational Search Report by the Japanese Patent Office dated Sep. 17, 2002, for International Application No. PCT/JP02/05581.

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