DE258329C - - Google Patents

Info

Publication number
DE258329C
DE258329C DENDAT258329D DE258329DA DE258329C DE 258329 C DE258329 C DE 258329C DE NDAT258329 D DENDAT258329 D DE NDAT258329D DE 258329D A DE258329D A DE 258329DA DE 258329 C DE258329 C DE 258329C
Authority
DE
Germany
Prior art keywords
drill
serpentines
snake
turns
diameter
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.)
Active
Application number
DENDAT258329D
Other languages
German (de)
English (en)
Publication of DE258329C publication Critical patent/DE258329C/de
Active 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
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/22—Rods or pipes with helical structure

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)
DENDAT258329D Active DE258329C (enExample)

Publications (1)

Publication Number Publication Date
DE258329C true DE258329C (enExample)

Family

ID=516166

Family Applications (1)

Application Number Title Priority Date Filing Date
DENDAT258329D Active DE258329C (enExample)

Country Status (1)

Country Link
DE (1) DE258329C (enExample)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4080093A (en) * 1974-11-18 1978-03-21 Hartmetallwerkzeugfabrik Andreas Maier Kg Drill for electronic conductor plates
DE3317989A1 (de) * 1983-05-18 1984-11-22 Hawera Probst Gmbh + Co, 7980 Ravensburg Bohrwerkzeug
US10695951B2 (en) 2015-11-09 2020-06-30 Robert Bosch Gmbh Drilling tool

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4080093A (en) * 1974-11-18 1978-03-21 Hartmetallwerkzeugfabrik Andreas Maier Kg Drill for electronic conductor plates
DE3317989A1 (de) * 1983-05-18 1984-11-22 Hawera Probst Gmbh + Co, 7980 Ravensburg Bohrwerkzeug
US10695951B2 (en) 2015-11-09 2020-06-30 Robert Bosch Gmbh Drilling tool

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