GB866242A - Improvements in or relating to pit props - Google Patents

Improvements in or relating to pit props

Info

Publication number
GB866242A
GB866242A GB1647758A GB1647758A GB866242A GB 866242 A GB866242 A GB 866242A GB 1647758 A GB1647758 A GB 1647758A GB 1647758 A GB1647758 A GB 1647758A GB 866242 A GB866242 A GB 866242A
Authority
GB
United Kingdom
Prior art keywords
prop
liquid
valve
pipe
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
GB1647758A
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.)
Kronprinz GmbH
Original Assignee
Kronprinz 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 Kronprinz GmbH filed Critical Kronprinz GmbH
Publication of GB866242A publication Critical patent/GB866242A/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
    • E21D15/50—Component parts or details of props
    • E21D15/51—Component parts or details of props specially adapted to hydraulic, pneumatic, or hydraulic-pneumatic props, e.g. arrangements of relief valves
    • E21D15/512—Arrangement of valves

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)
  • Credit Cards Or The Like (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)
  • Reciprocating Pumps (AREA)
GB1647758A 1957-05-23 1958-05-22 Improvements in or relating to pit props Expired GB866242A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEK32022A DE1113193B (de) 1957-05-23 1957-05-23 Hydraulischer Grubenstempel

Publications (1)

Publication Number Publication Date
GB866242A true GB866242A (en) 1961-04-26

Family

ID=7219329

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1647758A Expired GB866242A (en) 1957-05-23 1958-05-22 Improvements in or relating to pit props

Country Status (4)

Country Link
BE (1) BE567926A (enrdf_load_html_response)
DE (1) DE1113193B (enrdf_load_html_response)
FR (1) FR1196318A (enrdf_load_html_response)
GB (1) GB866242A (enrdf_load_html_response)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL300061A (enrdf_load_html_response) * 1963-08-19

Also Published As

Publication number Publication date
BE567926A (enrdf_load_html_response)
FR1196318A (fr) 1959-11-23
DE1113193B (de) 1961-08-31

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