JPS5931392A - 拡底用回転掘削ビツト装置 - Google Patents

拡底用回転掘削ビツト装置

Info

Publication number
JPS5931392A
JPS5931392A JP13934682A JP13934682A JPS5931392A JP S5931392 A JPS5931392 A JP S5931392A JP 13934682 A JP13934682 A JP 13934682A JP 13934682 A JP13934682 A JP 13934682A JP S5931392 A JPS5931392 A JP S5931392A
Authority
JP
Japan
Prior art keywords
drill pipe
drilling
expanding
expansion
bit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP13934682A
Other languages
English (en)
Japanese (ja)
Other versions
JPS6245953B2 (enExample
Inventor
健次 川崎
大橋　昭
隆司 松生
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Konoike Construction Co Ltd
Original Assignee
Konoike Construction Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Konoike Construction Co Ltd filed Critical Konoike Construction Co Ltd
Priority to JP13934682A priority Critical patent/JPS5931392A/ja
Publication of JPS5931392A publication Critical patent/JPS5931392A/ja
Publication of JPS6245953B2 publication Critical patent/JPS6245953B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Earth Drilling (AREA)
JP13934682A 1982-08-11 1982-08-11 拡底用回転掘削ビツト装置 Granted JPS5931392A (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13934682A JPS5931392A (ja) 1982-08-11 1982-08-11 拡底用回転掘削ビツト装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13934682A JPS5931392A (ja) 1982-08-11 1982-08-11 拡底用回転掘削ビツト装置

Publications (2)

Publication Number Publication Date
JPS5931392A true JPS5931392A (ja) 1984-02-20
JPS6245953B2 JPS6245953B2 (enExample) 1987-09-29

Family

ID=15243184

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13934682A Granted JPS5931392A (ja) 1982-08-11 1982-08-11 拡底用回転掘削ビツト装置

Country Status (1)

Country Link
JP (1) JPS5931392A (enExample)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63184612A (ja) * 1987-01-27 1988-07-30 Hitachi Constr Mach Co Ltd 拡底掘削機

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63184612A (ja) * 1987-01-27 1988-07-30 Hitachi Constr Mach Co Ltd 拡底掘削機

Also Published As

Publication number Publication date
JPS6245953B2 (enExample) 1987-09-29

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