GB674397A - Improvements in and relating to roof girders or bars in mines - Google Patents

Improvements in and relating to roof girders or bars in mines

Info

Publication number
GB674397A
GB674397A GB9704/50A GB970450A GB674397A GB 674397 A GB674397 A GB 674397A GB 9704/50 A GB9704/50 A GB 9704/50A GB 970450 A GB970450 A GB 970450A GB 674397 A GB674397 A GB 674397A
Authority
GB
United Kingdom
Prior art keywords
bar
shoe
bars
inclined surfaces
piece
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
GB9704/50A
Other languages
English (en)
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.)
Gutehoffnungshutte Oberhausen AG
Original Assignee
Gutehoffnungshutte Oberhausen AG
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 Gutehoffnungshutte Oberhausen AG filed Critical Gutehoffnungshutte Oberhausen AG
Publication of GB674397A publication Critical patent/GB674397A/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)
GB9704/50A 1950-03-09 1950-04-20 Improvements in and relating to roof girders or bars in mines Expired GB674397A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE674397X 1950-03-09

Publications (1)

Publication Number Publication Date
GB674397A true GB674397A (en) 1952-06-25

Family

ID=6591034

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9704/50A Expired GB674397A (en) 1950-03-09 1950-04-20 Improvements in and relating to roof girders or bars in mines

Country Status (4)

Country Link
BE (1) BE496301A (enrdf_load_stackoverflow)
FR (1) FR1025194A (enrdf_load_stackoverflow)
GB (1) GB674397A (enrdf_load_stackoverflow)
NL (1) NL72424C (enrdf_load_stackoverflow)

Also Published As

Publication number Publication date
FR1025194A (fr) 1953-04-13
NL72424C (enrdf_load_stackoverflow)
BE496301A (enrdf_load_stackoverflow)

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