GB679479A - Roof support for use in mines - Google Patents

Roof support for use in mines

Info

Publication number
GB679479A
GB679479A GB1642549A GB1642549A GB679479A GB 679479 A GB679479 A GB 679479A GB 1642549 A GB1642549 A GB 1642549A GB 1642549 A GB1642549 A GB 1642549A GB 679479 A GB679479 A GB 679479A
Authority
GB
United Kingdom
Prior art keywords
spigot
bars
fork
holes
covering
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
GB1642549A
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
Application filed by Individual filed Critical Individual
Priority to GB1642549A priority Critical patent/GB679479A/en
Priority to FR989994D priority patent/FR989994A/fr
Priority to BE491885D priority patent/BE491885A/xx
Publication of GB679479A publication Critical patent/GB679479A/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)
  • Connection Of Plates (AREA)
GB1642549A 1949-06-21 1949-06-21 Roof support for use in mines Expired GB679479A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB1642549A GB679479A (en) 1949-06-21 1949-06-21 Roof support for use in mines
FR989994D FR989994A (fr) 1949-06-21 1949-07-01 Soutènement pour mines à chapeaux en métal léger
BE491885D BE491885A (enrdf_load_stackoverflow) 1949-06-21 1949-10-22

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1642549A GB679479A (en) 1949-06-21 1949-06-21 Roof support for use in mines

Publications (1)

Publication Number Publication Date
GB679479A true GB679479A (en) 1952-09-17

Family

ID=10077092

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1642549A Expired GB679479A (en) 1949-06-21 1949-06-21 Roof support for use in mines

Country Status (3)

Country Link
BE (1) BE491885A (enrdf_load_stackoverflow)
FR (1) FR989994A (enrdf_load_stackoverflow)
GB (1) GB679479A (enrdf_load_stackoverflow)

Also Published As

Publication number Publication date
BE491885A (enrdf_load_stackoverflow) 1949-11-14
FR989994A (fr) 1951-09-25

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