GB661674A - Improvements in steel bars for use as mine roof supports - Google Patents

Improvements in steel bars for use as mine roof supports

Info

Publication number
GB661674A
GB661674A GB27671/48A GB2767148A GB661674A GB 661674 A GB661674 A GB 661674A GB 27671/48 A GB27671/48 A GB 27671/48A GB 2767148 A GB2767148 A GB 2767148A GB 661674 A GB661674 A GB 661674A
Authority
GB
United Kingdom
Prior art keywords
bar
flanges
pin
coupling piece
web
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
GB27671/48A
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.)
Dollery & Palmer Pneumatic Too
Original Assignee
Dollery & Palmer Pneumatic Too
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 Dollery & Palmer Pneumatic Too filed Critical Dollery & Palmer Pneumatic Too
Publication of GB661674A publication Critical patent/GB661674A/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)
GB27671/48A 1947-11-17 1948-10-25 Improvements in steel bars for use as mine roof supports Expired GB661674A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR661674X 1947-11-17

Publications (1)

Publication Number Publication Date
GB661674A true GB661674A (en) 1951-11-28

Family

ID=9011035

Family Applications (1)

Application Number Title Priority Date Filing Date
GB27671/48A Expired GB661674A (en) 1947-11-17 1948-10-25 Improvements in steel bars for use as mine roof supports

Country Status (2)

Country Link
FR (1) FR958217A (US07534539-20090519-C00280.png)
GB (1) GB661674A (US07534539-20090519-C00280.png)

Also Published As

Publication number Publication date
FR958217A (US07534539-20090519-C00280.png) 1950-03-06

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