JPS493604B1 - - Google Patents

Info

Publication number
JPS493604B1
JPS493604B1 JP44004502A JP450269A JPS493604B1 JP S493604 B1 JPS493604 B1 JP S493604B1 JP 44004502 A JP44004502 A JP 44004502A JP 450269 A JP450269 A JP 450269A JP S493604 B1 JPS493604 B1 JP S493604B1
Authority
JP
Japan
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.)
Pending
Application number
JP44004502A
Other languages
Japanese (ja)
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
Publication of JPS493604B1 publication Critical patent/JPS493604B1/ja
Pending legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
    • E21D23/0052—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor with advancing shifting devices connected therewith
    • 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

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)
  • Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
  • Lining And Supports For Tunnels (AREA)
  • Telescopes (AREA)
  • Conveying And Assembling Of Building Elements In Situ (AREA)
  • Tents Or Canopies (AREA)
  • Working Measures On Existing Buildindgs (AREA)
  • Excavating Of Shafts Or Tunnels (AREA)
JP44004502A 1968-01-25 1969-01-23 Pending JPS493604B1 (enrdf_load_stackoverflow)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB393768 1968-01-25

Publications (1)

Publication Number Publication Date
JPS493604B1 true JPS493604B1 (enrdf_load_stackoverflow) 1974-01-28

Family

ID=9767684

Family Applications (1)

Application Number Title Priority Date Filing Date
JP44004502A Pending JPS493604B1 (enrdf_load_stackoverflow) 1968-01-25 1969-01-23

Country Status (3)

Country Link
JP (1) JPS493604B1 (enrdf_load_stackoverflow)
DE (1) DE1902490C3 (enrdf_load_stackoverflow)
GB (1) GB1234662A (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2048355A (en) * 1979-05-08 1980-12-10 Gewerk Eisenhuette Westfalia Mine roof supports

Also Published As

Publication number Publication date
DE1902490B2 (de) 1975-01-09
GB1234662A (enrdf_load_stackoverflow) 1971-06-09
DE1902490C3 (de) 1975-08-14
DE1902490A1 (de) 1969-08-28

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