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GB935641A - Improvements in or relating to pit props - Google Patents

Improvements in or relating to pit props

Info

Publication number
GB935641A
GB935641A GB235659A GB235659A GB935641A GB 935641 A GB935641 A GB 935641A GB 235659 A GB235659 A GB 235659A GB 235659 A GB235659 A GB 235659A GB 935641 A GB935641 A GB 935641A
Authority
GB
United Kingdom
Prior art keywords
relating
reservoir
pit props
props
hydraulic 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
GB235659A
Inventor
Desmond Henry James Reynolds
Lionel Arthur Reynolds
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.)
BRD Co Ltd
Original Assignee
BRD Co 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 BRD Co Ltd filed Critical BRD Co Ltd
Priority to GB235659A priority Critical patent/GB935641A/en
Publication of GB935641A publication Critical patent/GB935641A/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)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)

Abstract

935,641. Hydraulic pit props. B.R.D. CO. Ltd. April 8, 1960 [Jan. 22, 1959], No. 2356/59. Class 20 (2). In an hydraulic pit prop, as described in Specification 768,446, the detachable valve and pump unit 10 is provided with a quick-setting valve 15 which is actuated by a manual control 13, 17, 18 and establishes communication between the pressure chamber and the reservoir by way of a flexible pipe 28 extending to the bottomof the reservoir. Specification 890,111 also is referred to.
GB235659A 1959-01-22 1959-01-22 Improvements in or relating to pit props Expired GB935641A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB235659A GB935641A (en) 1959-01-22 1959-01-22 Improvements in or relating to pit props

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB235659A GB935641A (en) 1959-01-22 1959-01-22 Improvements in or relating to pit props

Publications (1)

Publication Number Publication Date
GB935641A true GB935641A (en) 1963-09-04

Family

ID=9738116

Family Applications (1)

Application Number Title Priority Date Filing Date
GB235659A Expired GB935641A (en) 1959-01-22 1959-01-22 Improvements in or relating to pit props

Country Status (1)

Country Link
GB (1) GB935641A (en)

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