JPS53147601A - Device of varying diameter of bit for total section raise excavation - Google Patents

Device of varying diameter of bit for total section raise excavation

Info

Publication number
JPS53147601A
JPS53147601A JP6364377A JP6364377A JPS53147601A JP S53147601 A JPS53147601 A JP S53147601A JP 6364377 A JP6364377 A JP 6364377A JP 6364377 A JP6364377 A JP 6364377A JP S53147601 A JPS53147601 A JP S53147601A
Authority
JP
Japan
Prior art keywords
bit
varying diameter
total section
section raise
excavation
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
JP6364377A
Other languages
Japanese (ja)
Other versions
JPS577280B2 (en
Inventor
Takayuki Jinno
Yasuo Kotake
Toshihiro Kikuchi
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.)
Dowa Holdings Co Ltd
Original Assignee
Dowa Mining 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 Dowa Mining Co Ltd filed Critical Dowa Mining Co Ltd
Priority to JP6364377A priority Critical patent/JPS53147601A/en
Priority to DE2815149A priority patent/DE2815149C3/en
Priority to US06/895,103 priority patent/US4248312A/en
Publication of JPS53147601A publication Critical patent/JPS53147601A/en
Publication of JPS577280B2 publication Critical patent/JPS577280B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Earth Drilling (AREA)
JP6364377A 1977-04-28 1977-05-31 Device of varying diameter of bit for total section raise excavation Granted JPS53147601A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP6364377A JPS53147601A (en) 1977-05-31 1977-05-31 Device of varying diameter of bit for total section raise excavation
DE2815149A DE2815149C3 (en) 1977-04-28 1978-04-07 Method and device for breaking up a shaft by drilling upwards from a solid
US06/895,103 US4248312A (en) 1977-04-28 1978-04-10 Method and apparatus for upwardly cutting full cutting face of a shaft without requesting workmen's hands

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6364377A JPS53147601A (en) 1977-05-31 1977-05-31 Device of varying diameter of bit for total section raise excavation

Publications (2)

Publication Number Publication Date
JPS53147601A true JPS53147601A (en) 1978-12-22
JPS577280B2 JPS577280B2 (en) 1982-02-09

Family

ID=13235231

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6364377A Granted JPS53147601A (en) 1977-04-28 1977-05-31 Device of varying diameter of bit for total section raise excavation

Country Status (1)

Country Link
JP (1) JPS53147601A (en)

Also Published As

Publication number Publication date
JPS577280B2 (en) 1982-02-09

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