JPH0252077B2 - - Google Patents

Info

Publication number
JPH0252077B2
JPH0252077B2 JP60217615A JP21761585A JPH0252077B2 JP H0252077 B2 JPH0252077 B2 JP H0252077B2 JP 60217615 A JP60217615 A JP 60217615A JP 21761585 A JP21761585 A JP 21761585A JP H0252077 B2 JPH0252077 B2 JP H0252077B2
Authority
JP
Japan
Prior art keywords
expanding
hole
blade
diameter
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.)
Expired - Lifetime
Application number
JP60217615A
Other languages
English (en)
Japanese (ja)
Other versions
JPS6278393A (ja
Inventor
Junshoku Shin
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.)
KOKUDO BOSAI GIJUTSU KK
Original Assignee
KOKUDO BOSAI GIJUTSU KK
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 KOKUDO BOSAI GIJUTSU KK filed Critical KOKUDO BOSAI GIJUTSU KK
Priority to JP60217615A priority Critical patent/JPS6278393A/ja
Priority to KR1019850007880A priority patent/KR870003287A/ko
Publication of JPS6278393A publication Critical patent/JPS6278393A/ja
Publication of JPH0252077B2 publication Critical patent/JPH0252077B2/ja
Granted legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
  • Finger-Pressure Massage (AREA)
JP60217615A 1985-09-30 1985-09-30 多段式拡孔ビツト Granted JPS6278393A (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP60217615A JPS6278393A (ja) 1985-09-30 1985-09-30 多段式拡孔ビツト
KR1019850007880A KR870003287A (ko) 1985-09-30 1985-10-24 다단식확공빗트(多段式1擴孔 Bit)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP60217615A JPS6278393A (ja) 1985-09-30 1985-09-30 多段式拡孔ビツト

Publications (2)

Publication Number Publication Date
JPS6278393A JPS6278393A (ja) 1987-04-10
JPH0252077B2 true JPH0252077B2 (enrdf_load_html_response) 1990-11-09

Family

ID=16707067

Family Applications (1)

Application Number Title Priority Date Filing Date
JP60217615A Granted JPS6278393A (ja) 1985-09-30 1985-09-30 多段式拡孔ビツト

Country Status (2)

Country Link
JP (1) JPS6278393A (enrdf_load_html_response)
KR (1) KR870003287A (enrdf_load_html_response)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1959091A1 (en) * 2005-11-14 2008-08-20 Kabushiki Kaisha Miyanaga Diameter expanding groove cutting device and expanding/contracting mechanism tool

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS521681B2 (enrdf_load_html_response) * 1972-10-16 1977-01-17
JPH0236753B2 (ja) * 1983-01-14 1990-08-20 Kokudo Bosai Gijutsu Kk Kakukobitsuto
JPS6065890A (ja) * 1983-09-19 1985-04-15 国土防災技術株式会社 ア−スアンカ−用拡孔部削孔法

Also Published As

Publication number Publication date
KR870003287A (ko) 1987-04-16
JPS6278393A (ja) 1987-04-10

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