Boring or penetrating the earth – Bit or bit element – Nonsymmetrical bit
Reexamination Certificate
2006-11-21
2006-11-21
Dang, Hoang (Department: 3672)
Boring or penetrating the earth
Bit or bit element
Nonsymmetrical bit
C175S415000
Reexamination Certificate
active
07137462
ABSTRACT:
A drill bit constructed to improve a tip end of the cutting pointed portion to efficiently discharge chips from a center portion of a crush face of a drill hole to thereby improve cutting efficiency, is disclosed. A plurality of cutting blades3a, 3b, and3care formed to be arranged in a circumferential direction of a cutting blade chip3formed by a cemented carbide block body. The cutting blades3a, 3b, and3care each structured to have a cutting edge4formed by an edge between a face6and a flank7of the associated cutting blades. In this drill bit, a groove8is configured to be provided in a center portion of the tip end of the cutting blade chip in contact with tip ends of the cutting blade chip, and the tip ends of the cutting edges4have pointed portions.
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International Search Report for International Patent Application PCT/JP03/13981 dated Feb. 2, 2004 by the Japanese Patent Office (1 page).
Dang Hoang
Kabushiki Kaisha Miyanaga
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