GB704698A - Improvements in or relating to metallic extension bars used for roof supports in mines - Google Patents

Improvements in or relating to metallic extension bars used for roof supports in mines

Info

Publication number
GB704698A
GB704698A GB22448/51A GB2244851A GB704698A GB 704698 A GB704698 A GB 704698A GB 22448/51 A GB22448/51 A GB 22448/51A GB 2244851 A GB2244851 A GB 2244851A GB 704698 A GB704698 A GB 704698A
Authority
GB
United Kingdom
Prior art keywords
bar
bars
spigot
socket
union
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
GB22448/51A
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.)
REGIE DES MINES de la SARRE
Original Assignee
REGIE DES MINES de la SARRE
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 REGIE DES MINES de la SARRE filed Critical REGIE DES MINES de la SARRE
Publication of GB704698A publication Critical patent/GB704698A/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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/0064—Moulds characterised by special surfaces for producing a desired surface of a moulded article, e.g. profiled or polished moulding surfaces
    • B28B7/0067—Moulds characterised by special surfaces for producing a desired surface of a moulded article, e.g. profiled or polished moulding surfaces with polished or glossy moulding surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/34—Moulds, cores, or mandrels of special material, e.g. destructible materials

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Pivots And Pivotal Connections (AREA)
  • Mutual Connection Of Rods And Tubes (AREA)
  • Emergency Lowering Means (AREA)
GB22448/51A 1956-06-13 1951-09-25 Improvements in or relating to metallic extension bars used for roof supports in mines Expired GB704698A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR831565X 1956-06-13

Publications (1)

Publication Number Publication Date
GB704698A true GB704698A (en) 1954-02-24

Family

ID=9292721

Family Applications (2)

Application Number Title Priority Date Filing Date
GB22448/51A Expired GB704698A (en) 1956-06-13 1951-09-25 Improvements in or relating to metallic extension bars used for roof supports in mines
GB18721/57A Expired GB831565A (en) 1956-06-13 1957-06-13 Improvements in or relating to metallic extension bars used for roof supports in mines

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB18721/57A Expired GB831565A (en) 1956-06-13 1957-06-13 Improvements in or relating to metallic extension bars used for roof supports in mines

Country Status (5)

Country Link
BE (1) BE499866A (enrdf_load_stackoverflow)
DE (2) DE968919C (enrdf_load_stackoverflow)
FR (3) FR1023255A (enrdf_load_stackoverflow)
GB (2) GB704698A (enrdf_load_stackoverflow)
NL (1) NL88048C (enrdf_load_stackoverflow)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE741949C (de) * 1942-04-15 1943-11-19 Alois Vanwersch Als Gelenk ausgebildete Schaleneisenverbindung fuer den Grubenausbau
DE806133C (de) * 1948-10-02 1951-06-11 Johannes Ecker Gelenkverbindung fuer Stahlkappen

Also Published As

Publication number Publication date
NL88048C (enrdf_load_stackoverflow)
FR1028255A (fr) 1953-05-20
GB831565A (en) 1960-03-30
DE1045944B (de) 1958-12-11
FR69607E (fr) 1958-11-10
BE499866A (enrdf_load_stackoverflow)
DE968919C (de) 1958-04-10
FR1023255A (fr) 1953-03-16

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