Title:
NONCORING DRILL BIT
Document Type and Number:
WIPO Patent Application WO/2008/018559
Kind Code:
A1
Abstract:
A noncoring drill bit has a washer (2) attached to the head of a shank of a boring
tool, a circular column-like first diamond grindstone body (3) fixed to the washer
(2) and having cutout recess (10) open to one side, and a second diamond grindstone
body (4) placed in the cutout recess (10). The head of the second diamond grindstone
body (4) is located on the washer (2) side of the head of the first diamond grindstone
body (3). The inner side of the head surface of the first diamond grindstone body
(3) is preferably formed as a recess with a substantially mortar-like shape.
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Inventors:
NONAKA TAKUMA
MURAKAMI NAOHIDE
MORITA KAZUHISA
MURAKAMI NAOHIDE
MORITA KAZUHISA
Application Number:
PCT/JP2007/065652
Publication Date:
February 14, 2008
Filing Date:
August 09, 2007
Export Citation:
Assignee:
MAX CO LTD (JP)
UNIKA COMPANY LTD (JP)
NONAKA TAKUMA
MURAKAMI NAOHIDE
MORITA KAZUHISA
UNIKA COMPANY LTD (JP)
NONAKA TAKUMA
MURAKAMI NAOHIDE
MORITA KAZUHISA
International Classes:
B28D1/14; B24D7/18
Foreign References:
| JPS644605U | 1989-01-12 | |||
| JP2001232628A | 2001-08-28 | |||
| JPH0530891Y2 | 1993-08-09 | |||
| JPH05245827A | 1993-09-24 | |||
| JP2006217767A | 2006-08-17 |
Other References:
See also references of EP 2050550A4
Attorney, Agent or Firm:
OGURI, Shohei et al. (7-13 Nishi-Shimbashi 1-chome, Minato-k, Tokyo 03, JP)
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