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
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)

Description

Hierzu 1 Blatt Zeichnungen.
BERLIN. GEDRUCKT IN DER REICHSDRUCKEREI.

Claims (1)

  1. Patent-Anspruch:
    Gesteinbohrer, dessen vorderes Ende Schlangen windungen trägt, dadurch gekennzeichnet, daß der Durchmesser der Schlangenwindungen von der Bohrschneide gegen den glatten Teil des Bohrerschaftes abnimmt.
DENDAT258329D Active DE258329C (de)

Publications (1)

Publication Number Publication Date
DE258329C true DE258329C (de)

Family

ID=516166

Family Applications (1)

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

Country Status (1)

Country Link
DE (1) DE258329C (de)

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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