GB882246A - Improvements in and relating to props - Google Patents

Improvements in and relating to props

Info

Publication number
GB882246A
GB882246A GB947557A GB947557A GB882246A GB 882246 A GB882246 A GB 882246A GB 947557 A GB947557 A GB 947557A GB 947557 A GB947557 A GB 947557A GB 882246 A GB882246 A GB 882246A
Authority
GB
United Kingdom
Prior art keywords
valve
reservoir
past
piston
ram
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
GB947557A
Other languages
English (en)
Inventor
Thomas Stanley Pollard
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.)
Acrow Engineers Ltd
Original Assignee
Acrow Engineers 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 Acrow Engineers Ltd filed Critical Acrow Engineers Ltd
Priority to GB947557A priority Critical patent/GB882246A/en
Priority to FR1193513D priority patent/FR1193513A/fr
Priority to BE596046A priority patent/BE596046Q/fr
Publication of GB882246A publication Critical patent/GB882246A/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)
  • Reciprocating Pumps (AREA)
GB947557A 1957-03-22 1957-03-22 Improvements in and relating to props Expired GB882246A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB947557A GB882246A (en) 1957-03-22 1957-03-22 Improvements in and relating to props
FR1193513D FR1193513A (fr) 1957-03-22 1958-03-21 étançons
BE596046A BE596046Q (fr) 1957-03-22 1960-10-14 Etançons.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB947557A GB882246A (en) 1957-03-22 1957-03-22 Improvements in and relating to props

Publications (1)

Publication Number Publication Date
GB882246A true GB882246A (en) 1961-11-15

Family

ID=9872682

Family Applications (1)

Application Number Title Priority Date Filing Date
GB947557A Expired GB882246A (en) 1957-03-22 1957-03-22 Improvements in and relating to props

Country Status (3)

Country Link
BE (1) BE596046Q (fr)
FR (1) FR1193513A (fr)
GB (1) GB882246A (fr)

Also Published As

Publication number Publication date
BE596046Q (fr) 1961-04-14
FR1193513A (fr) 1959-11-03

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