FR984716A - metal prop for mines - Google Patents

metal prop for mines

Info

Publication number
FR984716A
FR984716A FR984716DA FR984716A FR 984716 A FR984716 A FR 984716A FR 984716D A FR984716D A FR 984716DA FR 984716 A FR984716 A FR 984716A
Authority
FR
France
Prior art keywords
mines
metal prop
prop
metal
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
Application number
Other languages
French (fr)
Inventor
Hans Gerlach
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 filed Critical
Application granted granted Critical
Publication of FR984716A publication Critical patent/FR984716A/en
Expired legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
    • E21D15/14—Telescopic props
    • E21D15/16—Telescopic props with parts held together by positive means, with or without relative sliding movement when the prop is subject to excessive pressure
    • E21D15/24—Telescopic props with parts held together by positive means, with or without relative sliding movement when the prop is subject to excessive pressure with axial screw-and-nut, rack-and-worm, or like mechanism
    • E21D15/26—Telescopic props with parts held together by positive means, with or without relative sliding movement when the prop is subject to excessive pressure with axial screw-and-nut, rack-and-worm, or like mechanism with screw, worm, or the like, not self-locking but normally prevented from rotation by friction members which slip upon excessive pressure

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
FR984716D 1948-10-01 1949-04-14 metal prop for mines Expired FR984716A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE984716X 1948-10-01

Publications (1)

Publication Number Publication Date
FR984716A true FR984716A (en) 1951-07-10

Family

ID=6918724

Family Applications (1)

Application Number Title Priority Date Filing Date
FR984716D Expired FR984716A (en) 1948-10-01 1949-04-14 metal prop for mines

Country Status (1)

Country Link
FR (1) FR984716A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2771264A (en) * 1952-04-02 1956-11-20 Jack Nixon Browne Pit prop

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2771264A (en) * 1952-04-02 1956-11-20 Jack Nixon Browne Pit prop

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