GB876797A - Improvements in hydraulic pit props - Google Patents

Improvements in hydraulic pit props

Info

Publication number
GB876797A
GB876797A GB30155/57A GB3015557A GB876797A GB 876797 A GB876797 A GB 876797A GB 30155/57 A GB30155/57 A GB 30155/57A GB 3015557 A GB3015557 A GB 3015557A GB 876797 A GB876797 A GB 876797A
Authority
GB
United Kingdom
Prior art keywords
pit props
sept
hydraulic pit
extension member
hydraulic
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
GB30155/57A
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.)
Gutehoffnungshutte Sterkrade AG
Original Assignee
Gutehoffnungshutte Sterkrade AG
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 Gutehoffnungshutte Sterkrade AG filed Critical Gutehoffnungshutte Sterkrade AG
Publication of GB876797A publication Critical patent/GB876797A/en
Expired legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
    • E21D15/14—Telescopic props
    • E21D15/44—Hydraulic, pneumatic, or hydraulic-pneumatic props
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F13/00—Apparatus or processes for magnetising or demagnetising
    • H01F13/003—Methods and devices for magnetising permanent magnets

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Accommodation For Nursing Or Treatment Tables (AREA)
  • Clamps And Clips (AREA)
  • Earth Drilling (AREA)
GB30155/57A 1956-09-25 1957-09-25 Improvements in hydraulic pit props Expired GB876797A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE559262X 1956-09-25

Publications (1)

Publication Number Publication Date
GB876797A true GB876797A (en) 1961-09-06

Family

ID=41227546

Family Applications (1)

Application Number Title Priority Date Filing Date
GB30155/57A Expired GB876797A (en) 1956-09-25 1957-09-25 Improvements in hydraulic pit props

Country Status (2)

Country Link
BE (1) BE559262A (cs)
GB (1) GB876797A (cs)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3270510A (en) * 1962-12-05 1966-09-06 Gullick Ltd Mine roof and like supports

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3270510A (en) * 1962-12-05 1966-09-06 Gullick Ltd Mine roof and like supports

Also Published As

Publication number Publication date
BE559262A (cs)

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