Blade edge structure for core drill

Details Blade edge structure for core drill Blade edge structure for core drill

2003-12-18

2008-03-11

Wright, Giovanna C (Department: 3672)

Boring or penetrating the earth

Bit or bit element

Core forming type

C175S405100

Reexamination Certificate

active

07341120

ABSTRACT:
A cutting portion structure of a core drill having diamond grains may affect deformation of a tip end portion of a cutting blade after extended use. A core drill A comprises cutting blades2formed at an opening end portion4of a cylindrical core body1and arranged in a circumferential direction of the core body to have gaps3between the cutting blades2. As viewed from a direction substantially perpendicular to a cross-sectional view in a radial direction of the core body1, the opening end portion4has an end face4A which is rounded without edges, and diamond grains are bound on the opening end portion4which is rounded without edges from an inner peripheral side to an outer peripheral side, thereby forming the cutting blades2.

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Translation of International Preliminary Report on Patentability dated May 28, 2004 for related International Application No. PCT/JP2003/016211 (5 pages).
International Search Report for International Patent Application No. PCT/JP03/16211 by the Japanese Patent Office, dated Mar. 29, 2004.

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