Title:
DRILLING BIT
Document Type and Number:
WIPO Patent Application WO/2022/091865
Kind Code:
A1
Abstract:
This drilling bit comprises a bit body (2) centered on a tool central axis (O), a plurality of drilling tips (3) projecting from an end surface (21) of the bit body (2), a discharge passage (4) disposed across the end surface (21) and an outer circumferential surface (22) of the bit body (2), and a blow hole (5) extending through the bit body (2) and opening at the end surface (21). The discharge passage (4) has a first passage (41) which has a groove shape positioned on the end surface (21) and extending in the tool radial direction, and at which the blow hole (5) opens, and a second passage (42) positioned on the end surface (21) outside the blow hole (5) in the tool radial direction, communicating with the first passage (41), and extending in the tool circumferential direction.
Inventors:
OTA HIROSHI (JP)
MATSUSE TAIYO (JP)
IOKA SATOSHI (JP)
DEATJIRAKARJORNSAKUN THANAKRIT (JP)
MATSUSE TAIYO (JP)
IOKA SATOSHI (JP)
DEATJIRAKARJORNSAKUN THANAKRIT (JP)
Application Number:
PCT/JP2021/038580
Publication Date:
May 05, 2022
Filing Date:
October 19, 2021
Export Citation:
Assignee:
MMC RYOTEC CORP (JP)
International Classes:
E21B10/38
Domestic Patent References:
| WO2020043504A1 | 2020-03-05 | |||
| WO2015113694A2 | 2015-08-06 |
Foreign References:
| US20160348442A1 | 2016-12-01 | |||
| US20180066477A1 | 2018-03-08 | |||
| JP2016196764A | 2016-11-24 | |||
| JP2020111902A | 2020-07-27 | |||
| JPS62502269A | 1987-09-03 | |||
| JP2020180553A | 2020-11-05 |
Attorney, Agent or Firm:
MATSUNUMA Yasushi et al. (JP)
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