Title:
掘削装置
Document Type and Number:
Japanese Patent JP7165403
Kind Code:
B2
Abstract:
To provide a drilling device that has a simple structure and can be constructed at low cost.SOLUTION: A drilling device comprises a casing shoe 3 provided at the tip of a casing pipe 2, and a bit device 4 inserted into the casing pipe 2 and having the tip protruding from the casing shoe 3. The bit device 4 receives an impact force and a rotational force, the casing shoe 3 receives the impact force from the bit device 4, and the drilled material generated by the drilling is discharged to the ground through the inside of the casing pipe 2. Since a tip tapered portion 15 that expands toward the tip is provided at the tip of the casing shoe 3, the rotating bit device 4 drills while receiving the impact force, and the casing shoe 3 is driven in by receiving the impact force from the bit device 4. Since the casing shoe 3 to be driven in is provided with the tip tapered portion 15 that expands toward the tip, the casing shoe can be driven in with less resistance than in the case of the reverse taper, and the drilled material can be guided to the inner side of the casing pipe 2.SELECTED DRAWING: Figure 1
Inventors:
Matsuzaki
Application Number:
JP2019147641A
Publication Date:
November 04, 2022
Filing Date:
August 09, 2019
Export Citation:
Assignee:
Matsuzaki
International Classes:
E21B7/20; E21B6/04
Domestic Patent References:
| JP2006152602A | ||||
| JP2003172089A | ||||
| JP2019007149A | ||||
| JP6257363A | ||||
| JP1097790A | ||||
| JP54161705A | ||||
| JP58073689A | ||||
| JP63184685A | ||||
| JP2010216101A | ||||
| JP1260194A |
Foreign References:
| US20100200302 |
Attorney, Agent or Firm:
Patent Attorney Corporation Ushiki International Patent Office
Ushiki Mamoru
Tomoyuki Takahashi
Yusuke Kato
Ushiki Mamoru
Tomoyuki Takahashi
Yusuke Kato