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GB891140A - Improvements in or relating to mine roof supporting bars - Google Patents

Improvements in or relating to mine roof supporting bars

Info

Publication number
GB891140A
GB891140A GB2112157A GB2112157A GB891140A GB 891140 A GB891140 A GB 891140A GB 2112157 A GB2112157 A GB 2112157A GB 2112157 A GB2112157 A GB 2112157A GB 891140 A GB891140 A GB 891140A
Authority
GB
United Kingdom
Prior art keywords
groove
mine roof
tongue
fork
relating
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
GB2112157A
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.)
Individual
Original Assignee
Individual
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 NL229339D priority Critical patent/NL229339A/xx
Priority to BE569133D priority patent/BE569133A/xx
Application filed by Individual filed Critical Individual
Priority to GB2112157A priority patent/GB891140A/en
Priority to FR1207659D priority patent/FR1207659A/fr
Publication of GB891140A publication Critical patent/GB891140A/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)
  • Conveying And Assembling Of Building Elements In Situ (AREA)
GB2112157A 1957-07-04 1957-07-04 Improvements in or relating to mine roof supporting bars Expired GB891140A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
NL229339D NL229339A (de) 1957-07-04
BE569133D BE569133A (de) 1957-07-04
GB2112157A GB891140A (en) 1957-07-04 1957-07-04 Improvements in or relating to mine roof supporting bars
FR1207659D FR1207659A (fr) 1957-07-04 1958-07-03 Barre de support, notamment pour le toit du boisage des galeries de mines

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2112157A GB891140A (en) 1957-07-04 1957-07-04 Improvements in or relating to mine roof supporting bars

Publications (1)

Publication Number Publication Date
GB891140A true GB891140A (en) 1962-03-14

Family

ID=10157548

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2112157A Expired GB891140A (en) 1957-07-04 1957-07-04 Improvements in or relating to mine roof supporting bars

Country Status (4)

Country Link
BE (1) BE569133A (de)
FR (1) FR1207659A (de)
GB (1) GB891140A (de)
NL (1) NL229339A (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1289805B (de) * 1962-01-29 1969-02-27 Groetschel Karl Maria Mechanisch rueckbare Strebausbaueinheit

Also Published As

Publication number Publication date
NL229339A (de)
FR1207659A (fr) 1960-02-18
BE569133A (de)

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