GB962543A - Improvements in and relating to hydraulic props - Google Patents

Improvements in and relating to hydraulic props

Info

Publication number
GB962543A
GB962543A GB28724/59A GB2872459A GB962543A GB 962543 A GB962543 A GB 962543A GB 28724/59 A GB28724/59 A GB 28724/59A GB 2872459 A GB2872459 A GB 2872459A GB 962543 A GB962543 A GB 962543A
Authority
GB
United Kingdom
Prior art keywords
valve
ram
main valve
head
auxiliary
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
GB28724/59A
Inventor
Reginald Reynolds
Peter Haig Stammers
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 GB28724/59A priority Critical patent/GB962543A/en
Priority to US50795A priority patent/US3046947A/en
Priority to FR836452A priority patent/FR1265719A/en
Publication of GB962543A publication Critical patent/GB962543A/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)
  • Check Valves (AREA)
  • Safety Valves (AREA)

Abstract

962,543. Valves. ACROW (ENGINEERS) Ltd. Aug. 16, 1960 [Aug. 21, 1959], No. 28724/59. Heading F2V. An hydraulic pit prop of the kind wherein working fluid is forced past a charging valve in the head 14 of a ram 12 into a pressure chamber 26 between the ram head and a cylinder 10 to cause the ram to be extended out from the cylinder, is arranged so that the charging valve also constitutes a pressure release valve, comprising a main valve closure 20 which has a small bleed passage 30 through it closed by an auxiliary valve closure 32 of relatively small size, whereby the force required to unseat the main valve against the chamber pressure is substantially greater than that required to unseat the auxiliary valve, the valve members being opened to release the chamber pressure by an actuating member or push-rod 38, 39 which acts first on the auxiliary valve and then on the main valve to open them successively. The valves are spring-urged in the closing direction. A flatted pin 40 passing through the bleed passage is interposed between the pushrod and the auxiliary valve member. The main valve member has a side port 22 in a tubular part 20 and a head part 23 which engages a seat. Specification 962,544 is referred to.
GB28724/59A 1959-08-21 1959-08-21 Improvements in and relating to hydraulic props Expired GB962543A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB28724/59A GB962543A (en) 1959-08-21 1959-08-21 Improvements in and relating to hydraulic props
US50795A US3046947A (en) 1959-08-21 1960-08-19 Hydraulic props
FR836452A FR1265719A (en) 1959-08-21 1960-08-22 Improvements to hydraulic props

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB28724/59A GB962543A (en) 1959-08-21 1959-08-21 Improvements in and relating to hydraulic props

Publications (1)

Publication Number Publication Date
GB962543A true GB962543A (en) 1964-07-01

Family

ID=10280082

Family Applications (1)

Application Number Title Priority Date Filing Date
GB28724/59A Expired GB962543A (en) 1959-08-21 1959-08-21 Improvements in and relating to hydraulic props

Country Status (2)

Country Link
US (1) US3046947A (en)
GB (1) GB962543A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1022469A (en) * 1964-02-11 1966-03-16 Dowty Mining Equipment Ltd Roof support assembly suitable for use in mines
DE2149451C2 (en) * 1971-10-04 1974-09-19 Hemscheidt Maschf Hermann Rock impact valve arrangement for a hydraulic pit ram

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1864325A (en) * 1930-05-05 1932-06-21 Curtis Mfg Co Supply conduit for piston machines
US2049335A (en) * 1934-09-15 1936-07-28 William G Stephens Quick action hydraulic jack
GB640414A (en) * 1948-03-06 1950-07-19 Mavor & Coulson Ltd Improvements in props
US2797550A (en) * 1954-05-05 1957-07-02 Stelzer William Hydraulic elevators

Also Published As

Publication number Publication date
US3046947A (en) 1962-07-31

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