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FR1138477A - Improvements made to metal props - Google Patents

Improvements made to metal props

Info

Publication number
FR1138477A
FR1138477A FR1138477DA FR1138477A FR 1138477 A FR1138477 A FR 1138477A FR 1138477D A FR1138477D A FR 1138477DA FR 1138477 A FR1138477 A FR 1138477A
Authority
FR
France
Prior art keywords
improvements made
metal props
props
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
Robert Donnet
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
DERVAUX DE FABRICATIONS POUR L
Original Assignee
DERVAUX DE FABRICATIONS POUR L
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 DERVAUX DE FABRICATIONS POUR L filed Critical DERVAUX DE FABRICATIONS POUR L
Application granted granted Critical
Publication of FR1138477A publication Critical patent/FR1138477A/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
    • E21D15/50—Component parts or details of props
    • E21D15/54—Details of the ends of props
    • 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
    • E21D15/15—Means counteracting entry of dirt; Built-in cleaning devices
    • E21D15/155—Built-in cleaning devices

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)
FR1138477D 1955-12-05 1955-12-05 Improvements made to metal props Expired FR1138477A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1138477T 1955-12-05

Publications (1)

Publication Number Publication Date
FR1138477A true FR1138477A (en) 1957-06-14

Family

ID=9641134

Family Applications (1)

Application Number Title Priority Date Filing Date
FR1138477D Expired FR1138477A (en) 1955-12-05 1955-12-05 Improvements made to metal props

Country Status (1)

Country Link
FR (1) FR1138477A (en)

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