Title:
DRILL
Document Type and Number:
WIPO Patent Application WO/2016/158463
Kind Code:
A1
Abstract:
This drill has a plurality of convex-arc-shaped cutting blades (4a, 4b) formed on the distal-end side of a drill body, the cutting blades extending from the outer periphery of the drill body to a chisel edge (14) near the axis of rotation, wherein the drill further has: substantially strip-shaped second surfaces (5a, 5b) formed along the convex-arc-shaped cutting blades, the second surfaces being formed rearward along the rotation direction from the convex-arc-shaped cutting blades; third surfaces (6a, 6b) formed sequentially rearward along the rotation direction from the second surfaces; and fourth surfaces (7a, 7b) formed sequentially rearward along the rotation direction from the third surfaces.
Inventors:
FUJIWARA SHIGEYOSHI (JP)
NIWA TERUAKI (JP)
NIWA TERUAKI (JP)
Application Number:
PCT/JP2016/058549
Publication Date:
October 06, 2016
Filing Date:
March 17, 2016
Export Citation:
Assignee:
MITSUBISHI HITACHI TOOL ENG LTD (JP)
International Classes:
B23B51/00
Domestic Patent References:
| WO2013065201A1 | 2013-05-10 |
Foreign References:
| JP2006525127A | 2006-11-09 | |||
| JPH09136206A | 1997-05-27 | |||
| JP2005199418A | 2005-07-28 |
Other References:
See also references of EP 3278911A4
Attorney, Agent or Firm:
SHIGA Masatake et al. (JP)
Masatake Shiga (JP)
Masatake Shiga (JP)
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