Title:
DRILL BIT
Document Type and Number:
WIPO Patent Application WO/2007/097343
Kind Code:
A1
Abstract:
Drilling edges (6) are formed at the front end of a tube part at appropriate intervals
in the circumferential direction. A center pin (12) capable of forming a center
hole (26) in an object is installed coaxially with and in the tube part and projects
outward in an axial direction from the drilling edges (6). The drill bit has a pressing
body (13) that is in contact with the rear end of the center pin (12) and is movable
in the axial direction, a first biasing means (14) for biasing the pressing body
(13) toward the drilling edges (60), a hammering block (15) for hammering the
pressing body (13) to cause the center pin (12) to form the center hole (26), and
second biasing means (16) for biasing the hammering block (15) toward the drilling
edges (6).
Inventors:
NONAKA TAKUMA
MURAKAMI NAOHIDE
MURAKAMI NAOHIDE
Application Number:
PCT/JP2007/053106
Publication Date:
August 30, 2007
Filing Date:
February 20, 2007
Export Citation:
Assignee:
MAX CO LTD (JP)
NONAKA TAKUMA
MURAKAMI NAOHIDE
NONAKA TAKUMA
MURAKAMI NAOHIDE
International Classes:
B23B51/04
Foreign References:
| JP2004330376A | 2004-11-25 | |||
| JP2001009618A | 2001-01-16 | |||
| JPH08336713A | 1996-12-24 |
Attorney, Agent or Firm:
OGURI, Shohei et al. (7-13 Nishi-Shimbashi 1-chome, Minato-k, Tokyo 03, JP)
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