GB1251968A - - Google Patents

Info

Publication number
GB1251968A
GB1251968A GB1251968DA GB1251968A GB 1251968 A GB1251968 A GB 1251968A GB 1251968D A GB1251968D A GB 1251968DA GB 1251968 A GB1251968 A GB 1251968A
Authority
GB
United Kingdom
Prior art keywords
flow control
rams
mine roof
base
control means
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
Other languages
English (en)
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 filed Critical
Publication of GB1251968A publication Critical patent/GB1251968A/en
Expired legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
    • E21D23/16—Hydraulic or pneumatic features, e.g. circuits, arrangement or adaptation of valves, setting or retracting devices
    • E21D23/18—Hydraulic or pneumatic features, e.g. circuits, arrangement or adaptation of valves, setting or retracting devices of advancing mechanisms

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)
  • Fluid-Pressure Circuits (AREA)
GB1251968D 1968-02-01 1968-02-01 Expired GB1251968A (enrdf_load_stackoverflow)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB521668 1968-02-01

Publications (1)

Publication Number Publication Date
GB1251968A true GB1251968A (enrdf_load_stackoverflow) 1971-11-03

Family

ID=9791889

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1251968D Expired GB1251968A (enrdf_load_stackoverflow) 1968-02-01 1968-02-01

Country Status (1)

Country Link
GB (1) GB1251968A (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3991580A (en) * 1974-11-15 1976-11-16 Gullick Dobson Limited Mine roof supports
FR2457963A1 (fr) * 1979-05-02 1980-12-26 Gewerk Eisenhuette Westfalia Dispositif pour la commande automatique de la sortie d'allonges de chapeaux de soutenement marchant en fonction de la progression de l'abattage

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3991580A (en) * 1974-11-15 1976-11-16 Gullick Dobson Limited Mine roof supports
FR2457963A1 (fr) * 1979-05-02 1980-12-26 Gewerk Eisenhuette Westfalia Dispositif pour la commande automatique de la sortie d'allonges de chapeaux de soutenement marchant en fonction de la progression de l'abattage

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees