Title:
NONAXISYMMETRICAL BLADE DRILL
Document Type and Number:
WIPO Patent Application WO/2007/097474
Kind Code:
A1
Abstract:
A drill capable of providing a cut hole high in circularity. The drill is characterized
in that a chisel portion is formed at the center of the tip end of the drill so that
the drill shaft center and the center of the chisel portion overlap each other,
at least one cutting blade out of a plurality of cutting blades and another cutting
blade are disposed non-symmetrically with respect to the drill shaft center
as the center axis, and the outer edges of the drill blades form arcs of a circle
around the drill shaft center.
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Inventors:
NISHIWAKI NOBUHIKO (JP)
HORI SANKEI (JP)
HORI SANKEI (JP)
Application Number:
PCT/JP2007/053992
Publication Date:
August 30, 2007
Filing Date:
February 23, 2007
Export Citation:
Assignee:
UNIV TOKYO NAT UNIV CORP (JP)
NISHIWAKI NOBUHIKO (JP)
HORI SANKEI (JP)
NISHIWAKI NOBUHIKO (JP)
HORI SANKEI (JP)
International Classes:
B23B51/00
Foreign References:
| JPS63120008A | 1988-05-24 | |||
| JPS5555312U | 1980-04-15 | |||
| JPH0451318U | 1992-04-30 | |||
| JPH05301109A | 1993-11-16 | |||
| JPH08155715A | 1996-06-18 | |||
| JP2002361509A | 2002-12-18 | |||
| JP2005246577A | 2005-09-15 | |||
| JPH11510103A | 1999-09-07 | |||
| US4913603A | 1990-04-03 |
Other References:
SHOSUKE TSUEDA; YOSHIO HASEGAWA; HIROSHI KIMURA: "Drill Walking Phenomenon", 1984, JAPAN SOCIETY OF MECHANICAL ENGINEERS COLLECTED PAPERS, pages: 50 - 453
See also references of EP 1992437A4
See also references of EP 1992437A4
Attorney, Agent or Firm:
HIRAISHI, Toshiko (Nishi-Shinbashi Minato-ku, Tokyo, JP)
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