Title:
打撃式掘削のためのドリルビットおよび打撃式掘削方法
Document Type and Number:
Japanese Patent JP7489598
Kind Code:
B2
Abstract:
An internally threaded bit for percussion drilling is provided, which has thread roots wider than the thread crests. A single drill bit, configured according to the present invention, can be connected to a variety of rods, having differing crest widths in their male threads. The invention enables the service life of the rods to be optimized to suit the drilling conditions at hand, without the need to manufacture and keep in inventory a correspondingly large variety of drill bits. The bit of the invention exhibits a reduced rate of ringing off, and can accept drill rods having a range of crest widths.
Inventors:
YAO, James, Jing
Application Number:
JP2021544813A
Publication Date:
May 24, 2024
Filing Date:
February 06, 2020
Export Citation:
Assignee:
YAO, James, Jing
International Classes:
E21B17/042; E21B10/36; F16B33/02
Domestic Patent References:
| JP2014189990A | ||||
| JP2000104477A | ||||
| JP2001003673A |
Foreign References:
| CN208152957U | ||||
| US6196598 | ||||
| US4332502 | ||||
| US20040050592 |
Attorney, Agent or Firm:
Axis International Patent Attorney Corporation
Ikeda Adult
Junichiro Sakamaki
Masakazu Noda
Ikeda Adult
Junichiro Sakamaki
Masakazu Noda