GB1250381A - - Google Patents

Info

Publication number
GB1250381A
GB1250381A GB1250381DA GB1250381A GB 1250381 A GB1250381 A GB 1250381A GB 1250381D A GB1250381D A GB 1250381DA GB 1250381 A GB1250381 A GB 1250381A
Authority
GB
United Kingdom
Prior art keywords
cantilever
torsion bar
roof support
mine roof
bar
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
English (en)
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 GB1250381A publication Critical patent/GB1250381A/en
Expired legal-status Critical Current

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
    • E21D17/08—Cap joints for obtaining a coal-face free of pit-props
    • E21D17/086—Cap joints for obtaining a coal-face free of pit-props or articulated type

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)
  • Bridges Or Land Bridges (AREA)
GB1250381D 1969-03-20 1969-03-20 Expired GB1250381A (enrdf_load_stackoverflow)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1472569 1969-03-20

Publications (1)

Publication Number Publication Date
GB1250381A true GB1250381A (enrdf_load_stackoverflow) 1971-10-20

Family

ID=10046382

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1250381D Expired GB1250381A (enrdf_load_stackoverflow) 1969-03-20 1969-03-20

Country Status (1)

Country Link
GB (1) GB1250381A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3404925A1 (de) * 1984-02-11 1985-08-22 Bergwerksverband Gmbh, 4300 Essen Rueckpfaendkappe fuer schreitausbau

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3404925A1 (de) * 1984-02-11 1985-08-22 Bergwerksverband Gmbh, 4300 Essen Rueckpfaendkappe fuer schreitausbau

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NL145315B (nl) Kanteldeur.

Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees