GB859878A - A new or improved hydraulic pit prop - Google Patents

A new or improved hydraulic pit prop

Info

Publication number
GB859878A
GB859878A GB8929/57A GB892957A GB859878A GB 859878 A GB859878 A GB 859878A GB 8929/57 A GB8929/57 A GB 8929/57A GB 892957 A GB892957 A GB 892957A GB 859878 A GB859878 A GB 859878A
Authority
GB
United Kingdom
Prior art keywords
prop
piston
pump
reservoir
hydraulic pit
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
GB8929/57A
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.)
BOCHUMER GES fur GRUBENAUSBAU
Original Assignee
BOCHUMER GES fur GRUBENAUSBAU
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 BOCHUMER GES fur GRUBENAUSBAU filed Critical BOCHUMER GES fur GRUBENAUSBAU
Publication of GB859878A publication Critical patent/GB859878A/en
Expired legal-status Critical Current

Links

Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D15/00Props; Chocks, e.g. made of flexible containers filled with backfilling material
    • E21D15/14Telescopic props
    • E21D15/44Hydraulic, pneumatic, or hydraulic-pneumatic props
    • E21D15/45Hydraulic, pneumatic, or hydraulic-pneumatic props having closed fluid system, e.g. with built-in pumps or accumulators

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)
GB8929/57A 1956-03-19 1957-03-19 A new or improved hydraulic pit prop Expired GB859878A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT859878X 1956-03-19

Publications (1)

Publication Number Publication Date
GB859878A true GB859878A (en) 1961-01-25

Family

ID=3682329

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8929/57A Expired GB859878A (en) 1956-03-19 1957-03-19 A new or improved hydraulic pit prop

Country Status (3)

Country Link
BE (1) BE555935A (fr)
FR (1) FR1173246A (fr)
GB (1) GB859878A (fr)

Also Published As

Publication number Publication date
FR1173246A (fr) 1959-02-23
BE555935A (fr)

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