AT359452B - STEP TURNING CROWN - Google Patents

STEP TURNING CROWN

Info

Publication number
AT359452B
AT359452B AT815478A AT815478A AT359452B AT 359452 B AT359452 B AT 359452B AT 815478 A AT815478 A AT 815478A AT 815478 A AT815478 A AT 815478A AT 359452 B AT359452 B AT 359452B
Authority
AT
Austria
Prior art keywords
step turning
turning crown
crown
turning
Prior art date
Application number
AT815478A
Other languages
German (de)
Other versions
ATA815478A (en
Inventor
Ernst Ing Gockert
Original Assignee
Ver Edelstahlwerke Ag
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 Ver Edelstahlwerke Ag filed Critical Ver Edelstahlwerke Ag
Publication of ATA815478A publication Critical patent/ATA815478A/en
Application granted granted Critical
Publication of AT359452B publication Critical patent/AT359452B/en

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
    • E21B10/62—Drill bits characterised by parts, e.g. cutting elements, which are detachable or adjustable
    • 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
    • E21B10/36—Percussion drill bits
    • E21B10/40—Percussion drill bits with leading portion

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)
  • Drilling Tools (AREA)
AT815478A 1977-11-19 1978-11-15 STEP TURNING CROWN AT359452B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19772751848 DE2751848C3 (en) 1977-11-19 1977-11-19 Step drill bit

Publications (2)

Publication Number Publication Date
ATA815478A ATA815478A (en) 1980-04-15
AT359452B true AT359452B (en) 1980-11-10

Family

ID=6024186

Family Applications (1)

Application Number Title Priority Date Filing Date
AT815478A AT359452B (en) 1977-11-19 1978-11-15 STEP TURNING CROWN

Country Status (2)

Country Link
AT (1) AT359452B (en)
DE (1) DE2751848C3 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102383738A (en) * 2011-06-27 2012-03-21 永贵能源开发有限责任公司 Method and device for improving deep hole forming rate of bedding layer of coal mine

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1701427A (en) * 1927-02-23 1929-02-05 Bert Russell Rotary drilling and reaming tool organization
GB528593A (en) * 1939-05-10 1940-11-01 Jessop William & Sons Ltd Improvements in or relating to rotary bits for rock and like drilling
DE1114453B (en) * 1959-01-19 1961-10-05 De Orr Cook Drill rods with cutting chisels
DE1191319B (en) * 1963-09-19 1965-04-22 Eickhoff Geb Control for the winch of cutting machines
DE1891805U (en) * 1964-02-19 1964-04-30 Wallraum Hartmetall G M B H ROCK AND MINERAL DRILLS WITH MULTIPLE STEP CHISELS.
DE1913316A1 (en) * 1969-03-15 1970-09-17 Happich Gmbh Gebr Handrail

Also Published As

Publication number Publication date
ATA815478A (en) 1980-04-15
DE2751848B2 (en) 1980-07-31
DE2751848C3 (en) 1981-04-02
DE2751848A1 (en) 1979-05-23

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Legal Events

Date Code Title Description
ELJ Ceased due to non-payment of the annual fee