ZA734686B - Mine roof supports - Google Patents

Mine roof supports

Info

Publication number
ZA734686B
ZA734686B ZA734686A ZA734686A ZA734686B ZA 734686 B ZA734686 B ZA 734686B ZA 734686 A ZA734686 A ZA 734686A ZA 734686 A ZA734686 A ZA 734686A ZA 734686 B ZA734686 B ZA 734686B
Authority
ZA
South Africa
Prior art keywords
mine roof
roof supports
supports
mine
roof
Prior art date
Application number
ZA734686A
Other languages
English (en)
Inventor
K Cheshir
J Walker
Original Assignee
Dowty Mining Equipment Ltd
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 Dowty Mining Equipment Ltd filed Critical Dowty Mining Equipment Ltd
Publication of ZA734686B publication Critical patent/ZA734686B/xx

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
    • E21D23/006—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor provided with essential hydraulic devices

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)
  • Safety Valves (AREA)
  • Fluid-Pressure Circuits (AREA)
ZA734686A 1972-07-22 1973-07-11 Mine roof supports ZA734686B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3439372A GB1430240A (en) 1972-07-22 1972-07-22 Mine roof support

Publications (1)

Publication Number Publication Date
ZA734686B true ZA734686B (en) 1974-06-26

Family

ID=10365098

Family Applications (1)

Application Number Title Priority Date Filing Date
ZA734686A ZA734686B (en) 1972-07-22 1973-07-11 Mine roof supports

Country Status (4)

Country Link
DE (1) DE2337390B2 (xx)
GB (1) GB1430240A (xx)
PL (1) PL91078B1 (xx)
ZA (1) ZA734686B (xx)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4237769A (en) * 1978-04-03 1980-12-09 Commercial Shearing, Inc. Relief valves and mine props incorporating the same
DE3340888C1 (de) * 1983-11-11 1985-02-07 Hermann Hemscheidt Maschinenfabrik Gmbh & Co, 5600 Wuppertal Hydraulischer Stempel mit Gebirgsschlagventil für ein Schreitausbaugestell
CN109322689B (zh) * 2018-10-31 2024-06-25 辽宁工程技术大学 一种防冲液压支架用压力流量函数控制阀组

Also Published As

Publication number Publication date
DE2337390A1 (de) 1974-02-07
GB1430240A (en) 1976-03-31
PL91078B1 (xx) 1977-02-28
DE2337390B2 (de) 1977-11-10

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