GB775180A - Improvements in or relating to roof bars for use in underground mines - Google Patents

Improvements in or relating to roof bars for use in underground mines

Info

Publication number
GB775180A
GB775180A GB959854A GB959854A GB775180A GB 775180 A GB775180 A GB 775180A GB 959854 A GB959854 A GB 959854A GB 959854 A GB959854 A GB 959854A GB 775180 A GB775180 A GB 775180A
Authority
GB
United Kingdom
Prior art keywords
bar
claws
roof
flange
lip shield
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
GB959854A
Other languages
English (en)
Inventor
Jack Hanman
Jack Booker
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.)
Coal Industry Patents Ltd
Original Assignee
Coal Industry Patents Ltd
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
Priority to BE536990D priority Critical patent/BE536990A/xx
Application filed by Coal Industry Patents Ltd filed Critical Coal Industry Patents Ltd
Priority to GB959854A priority patent/GB775180A/en
Priority to FR1131903D priority patent/FR1131903A/fr
Publication of GB775180A publication Critical patent/GB775180A/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)
  • Lining And Supports For Tunnels (AREA)
GB959854A 1954-04-01 1954-04-01 Improvements in or relating to roof bars for use in underground mines Expired GB775180A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BE536990D BE536990A (enrdf_load_stackoverflow) 1954-04-01
GB959854A GB775180A (en) 1954-04-01 1954-04-01 Improvements in or relating to roof bars for use in underground mines
FR1131903D FR1131903A (fr) 1954-04-01 1955-04-01 Barre de toit pour mines souterraines

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB959854A GB775180A (en) 1954-04-01 1954-04-01 Improvements in or relating to roof bars for use in underground mines

Publications (1)

Publication Number Publication Date
GB775180A true GB775180A (en) 1957-05-22

Family

ID=9875073

Family Applications (1)

Application Number Title Priority Date Filing Date
GB959854A Expired GB775180A (en) 1954-04-01 1954-04-01 Improvements in or relating to roof bars for use in underground mines

Country Status (3)

Country Link
BE (1) BE536990A (enrdf_load_stackoverflow)
FR (1) FR1131903A (enrdf_load_stackoverflow)
GB (1) GB775180A (enrdf_load_stackoverflow)

Also Published As

Publication number Publication date
BE536990A (enrdf_load_stackoverflow)
FR1131903A (fr) 1957-03-01

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