FR56753E - metal prop - Google Patents

metal prop

Info

Publication number
FR56753E
FR56753E FR56753DA FR56753E FR 56753 E FR56753 E FR 56753E FR 56753D A FR56753D A FR 56753DA FR 56753 E FR56753 E FR 56753E
Authority
FR
France
Prior art keywords
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
Maurice Dardenne
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 FR56753E publication Critical patent/FR56753E/en
Expired legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK 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)
FR56753D 1947-04-11 1947-04-11 metal prop Expired FR56753E (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR56753T 1947-04-11

Publications (1)

Publication Number Publication Date
FR56753E true FR56753E (en) 1952-10-06

Family

ID=8690907

Family Applications (1)

Application Number Title Priority Date Filing Date
FR56753D Expired FR56753E (en) 1947-04-11 1947-04-11 metal prop

Country Status (1)

Country Link
FR (1) FR56753E (en)

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