Non-core drill bit

Details Non-core drill bit Non-core drill bit

2007-08-09

2011-11-01

Rose, Robert (Department: 3727)

Stone working

Sawing

Disk cutting

C451S548000

Reexamination Certificate

active

08047193

ABSTRACT:
A non-core drill bit is provided with a metallic seat2attached to the tip of a shank of a boring tool, a cylindrical first diamond grindstone body3fixed to the metallic seat2and having a recessed cutout portion10to be opened to one side, and a second diamond grindstone body4installed inside the recessed cutout portion10. The tip of the second diamond grindstone body4is positioned on the metallic seat2side from the tip of the first diamond grindstone body3. The inner side of the tip face of the first diamond grindstone body3is preferably formed in an approximately reverse-conical recessed shape.

REFERENCES:
patent: 64-4605 (1989-01-01), None
patent: 05-30891 (1993-08-01), None
patent: 5-245827 (1993-09-01), None
patent: 2001-232628 (2001-08-01), None

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