BE541208A - - Google Patents

Info

Publication number
BE541208A
BE541208A BE541208DA BE541208A BE 541208 A BE541208 A BE 541208A BE 541208D A BE541208D A BE 541208DA BE 541208 A BE541208 A BE 541208A
Authority
BE
Belgium
Prior art keywords
prop
head
supports
cylinders
hydraulic
Prior art date
Application number
Other languages
English (en)
French (fr)
Publication of BE541208A publication Critical patent/BE541208A/fr

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D17/00—Caps for supporting mine roofs
    • E21D17/02—Cantilever extension or similar protecting devices
    • E21D17/0206—Hydraulically operated extension devices
    • 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
    • E21D15/52—Extensible units located above or below standard props
    • E21D15/523—Extensible units located above or below standard props with hydraulic or pneumatic control

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
  • Actuator (AREA)
BE541208D BE541208A (enrdf_load_html_response)

Publications (1)

Publication Number Publication Date
BE541208A true BE541208A (enrdf_load_html_response)

Family

ID=170304

Family Applications (1)

Application Number Title Priority Date Filing Date
BE541208D BE541208A (enrdf_load_html_response)

Country Status (1)

Country Link
BE (1) BE541208A (enrdf_load_html_response)

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