GB962542A - Improvements in and relating to hydraulic props - Google Patents

Improvements in and relating to hydraulic props

Info

Publication number
GB962542A
GB962542A GB2872359A GB2872359A GB962542A GB 962542 A GB962542 A GB 962542A GB 2872359 A GB2872359 A GB 2872359A GB 2872359 A GB2872359 A GB 2872359A GB 962542 A GB962542 A GB 962542A
Authority
GB
United Kingdom
Prior art keywords
latch
piston
aug
groove
pressure
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
GB2872359A
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 GB2872359A priority Critical patent/GB962542A/en
Priority to DEA35403A priority patent/DE1152375B/en
Priority to FR836451A priority patent/FR1265718A/en
Publication of GB962542A publication Critical patent/GB962542A/en
Expired legal-status Critical Current

Links

Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D15/00Props; Chocks, e.g. made of flexible containers filled with backfilling material
    • E21D15/14Telescopic props
    • E21D15/44Hydraulic, pneumatic, or hydraulic-pneumatic props

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)
  • Press Drives And Press Lines (AREA)
  • Reciprocating Pumps (AREA)

Abstract

962,542. Reciprocating pumps. ACROW (ENGINEERS) Ltd. Aug. 16, 1960 [Aug. 21, 1959], No. 28723/59. Heading F1A. [Also in Division El] An hydraulic pit prop, see Division El, is provided with a differential reciprocating pump comprising low-and high-pressure pistons 24, 22 which are inter-connected together by a latch only when the pumping pressure is low. An adjustable spring-loaded or hydraulically operated latch interlocks a hollow post 38 fixed to the piston 24 and a slide block 36 fixed to the piston rod 22, the latch being disposed in the block 36 and co-operating with a groove 40 on the post, see also Fig. 2 (not shown), to effect locking of said members 22, 24 until the pressure beneath the latter rises to prevent movement of same. The latch may be disposed in a bore in the piston 24 and engage a groove in the member 22 or an extension thereof. Specifications 962,541 and 962,544 are referred to.
GB2872359A 1959-08-21 1959-08-21 Improvements in and relating to hydraulic props Expired GB962542A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB2872359A GB962542A (en) 1959-08-21 1959-08-21 Improvements in and relating to hydraulic props
DEA35403A DE1152375B (en) 1959-08-21 1960-08-22 Hydraulic pit ram
FR836451A FR1265718A (en) 1959-08-21 1960-08-22 hydraulic mine prop

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2872359A GB962542A (en) 1959-08-21 1959-08-21 Improvements in and relating to hydraulic props

Publications (1)

Publication Number Publication Date
GB962542A true GB962542A (en) 1964-07-01

Family

ID=10280065

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2872359A Expired GB962542A (en) 1959-08-21 1959-08-21 Improvements in and relating to hydraulic props

Country Status (2)

Country Link
DE (1) DE1152375B (en)
GB (1) GB962542A (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE486663A (en) * 1948-01-12
NL191038A (en) * 1953-09-24 1900-01-01
BE553228A (en) * 1955-12-08
BE559146A (en) * 1956-07-05

Also Published As

Publication number Publication date
DE1152375B (en) 1963-08-08

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