Title:
DRILL HEAD, DRILL MACHINE, AND METHOD FOR CONSTRUCTION OF BOREHOLE
Document Type and Number:
Japanese Patent JP2019183420
Kind Code:
A
Abstract:
To provide a drill head, a drill machine, and a method for construction of a borehole, all of which being capable of drilling a borehole even when a hard and large stone such as a cobblestone appears.SOLUTION: A drill head includes four drill blades 20 extending in the radial direction and a plurality of drill bits 23 which are projected to the bottom side of each of the drill blades, and each of the four drill blades 20 is configured with a bottom plate 21, and a back plate 22 which is provided on the rear side Rb in the rotation direction with respect to the bottom plate 21, and also a cross-section L shaped storage space C on the upper surface side of each of the four drill blades 20 is configured with the bottom plate 21 and the back plate 22, and further the front end surface 23f that is the front side Rf in the rotation direction of each of the plurality of drill bits 23 is provided so as to be the front side Rf in the rotation direction with respect to the front end surface 21f of the bottom plate 21.SELECTED DRAWING: Figure 1
Inventors:
TAKEDA SHIGETSUGU
YAMAUCHI SHINYA
MINATO KENJI
KITAHARA TOSHIHIRO
OGISU KAZUYUKI
NAKAZAWA KOSUKE
YAMAUCHI SHINYA
MINATO KENJI
KITAHARA TOSHIHIRO
OGISU KAZUYUKI
NAKAZAWA KOSUKE
Application Number:
JP2018071738A
Publication Date:
October 24, 2019
Filing Date:
April 03, 2018
Export Citation:
Assignee:
TEKKEN CONSTR CO
TOA TONE BORING CO LTD
TOA TONE BORING CO LTD
International Classes:
E21B10/00; E21B10/26
Domestic Patent References:
| JPS56159497A | 1981-12-08 | |||
| JPS57168586U | 1982-10-23 | |||
| JPS469010Y1 | 1971-03-31 | |||
| JP2014043732A | 2014-03-13 |
Foreign References:
| US5417292A | 1995-05-23 |
Attorney, Agent or Firm:
Motoaki Nagata
Eiji Ota
Yoshiaki Nagata
Eiji Ota
Yoshiaki Nagata