GB972317A - Improvements in or relating to telescopic pit props - Google Patents

Improvements in or relating to telescopic pit props

Info

Publication number
GB972317A
GB972317A GB636762A GB636762A GB972317A GB 972317 A GB972317 A GB 972317A GB 636762 A GB636762 A GB 636762A GB 636762 A GB636762 A GB 636762A GB 972317 A GB972317 A GB 972317A
Authority
GB
United Kingdom
Prior art keywords
fluid
chamber
passages
section
sections
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
GB636762A
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.)
Hoesch Bergbautechnik GmbH
Original Assignee
Hoesch Bergbautechnik GmbH
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 Hoesch Bergbautechnik GmbH filed Critical Hoesch Bergbautechnik GmbH
Publication of GB972317A publication Critical patent/GB972317A/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

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)
  • On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
GB636762A 1961-02-18 1962-02-19 Improvements in or relating to telescopic pit props Expired GB972317A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEH0041738 1961-02-18

Publications (1)

Publication Number Publication Date
GB972317A true GB972317A (en) 1964-10-14

Family

ID=7154643

Family Applications (1)

Application Number Title Priority Date Filing Date
GB636762A Expired GB972317A (en) 1961-02-18 1962-02-19 Improvements in or relating to telescopic pit props

Country Status (2)

Country Link
GB (1) GB972317A (cs)
NL (1) NL274871A (cs)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3301519A (en) * 1964-10-20 1967-01-31 Gewerk Eisenhuette Westfalia Double telescoping hydraulic prop

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3301519A (en) * 1964-10-20 1967-01-31 Gewerk Eisenhuette Westfalia Double telescoping hydraulic prop

Also Published As

Publication number Publication date
NL274871A (cs)

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