KR870003287A - 다단식확공빗트(多段式1擴孔 Bit) - Google Patents

다단식확공빗트(多段式1擴孔 Bit) Download PDF

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Publication number
KR870003287A
KR870003287A KR1019850007880A KR850007880A KR870003287A KR 870003287 A KR870003287 A KR 870003287A KR 1019850007880 A KR1019850007880 A KR 1019850007880A KR 850007880 A KR850007880 A KR 850007880A KR 870003287 A KR870003287 A KR 870003287A
Authority
KR
South Korea
Prior art keywords
diameter
expansion bit
bit
expansion
blade
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.)
Abandoned
Application number
KR1019850007880A
Other languages
English (en)
Korean (ko)
Inventor
신윤식
Original Assignee
신윤식
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 신윤식 filed Critical 신윤식
Publication of KR870003287A publication Critical patent/KR870003287A/ko
Abandoned legal-status Critical Current

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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)
KR1019850007880A 1985-09-30 1985-10-24 다단식확공빗트(多段式1擴孔 Bit) Abandoned KR870003287A (ko)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP217615 1985-09-30
JP60217615A JPS6278393A (ja) 1985-09-30 1985-09-30 多段式拡孔ビツト

Publications (1)

Publication Number Publication Date
KR870003287A true KR870003287A (ko) 1987-04-16

Family

ID=16707067

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019850007880A Abandoned KR870003287A (ko) 1985-09-30 1985-10-24 다단식확공빗트(多段式1擴孔 Bit)

Country Status (2)

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

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090139772A1 (en) * 2005-11-14 2009-06-04 Kabushiki Kaisha Myanaga Diametrically expanded groove cutting apparatus and expandable mechanism

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS521681B2 (enrdf_load_stackoverflow) * 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
JPS6278393A (ja) 1987-04-10
JPH0252077B2 (enrdf_load_stackoverflow) 1990-11-09

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Legal Events

Date Code Title Description
PA0109 Patent application

Patent event code: PA01091R01D

Comment text: Patent Application

Patent event date: 19851024

PG1501 Laying open of application
E902 Notification of reason for refusal
PE0902 Notice of grounds for rejection

Comment text: Notification of reason for refusal

Patent event date: 19890418

Patent event code: PE09021S01D

PC1902 Submission of document of abandonment before decision of registration
SUBM Surrender of laid-open application requested