GB948255A - Improvements in or relating to hydraulic pit props - Google Patents

Improvements in or relating to hydraulic pit props

Info

Publication number
GB948255A
GB948255A GB726659A GB726659A GB948255A GB 948255 A GB948255 A GB 948255A GB 726659 A GB726659 A GB 726659A GB 726659 A GB726659 A GB 726659A GB 948255 A GB948255 A GB 948255A
Authority
GB
United Kingdom
Prior art keywords
prop
hydraulic pit
relating
annulus
pit props
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
GB726659A
Inventor
Wilfred Allsop
Frank Cowlishaw
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.)
Dobson Ltd W E & F
WE&F Dobson Ltd
Original Assignee
Dobson Ltd W E & F
WE&F Dobson 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 Dobson Ltd W E & F, WE&F Dobson Ltd filed Critical Dobson Ltd W E & F
Priority to GB726659A priority Critical patent/GB948255A/en
Priority to DED32761A priority patent/DE1173053B/en
Publication of GB948255A publication Critical patent/GB948255A/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
    • E21D15/14—Telescopic props
    • E21D15/44—Hydraulic, pneumatic, or hydraulic-pneumatic props
    • 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
    • E21D15/14—Telescopic props
    • E21D15/15—Means counteracting entry of dirt; Built-in cleaning devices
    • 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
    • E21D15/14—Telescopic props
    • E21D15/15—Means counteracting entry of dirt; Built-in cleaning devices
    • E21D15/155—Built-in cleaning devices

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)
  • Actuator (AREA)
  • Pressure Vessels And Lids Thereof (AREA)

Abstract

948,255. Hydraulic pit props. W. E. & F. DOBSON Ltd. Feb. 22, 1960 [March 3, 1959], No. 7266/59. Heading E1E. An hydraulic pit prop as disclosed in Specification 821,645 is provided with a sealed outer guard tube 11 defining with the cylinder 4 an annular gap 12 which communicates by means of a port 14 with the annulus 13 between the piston and cylinder unit 1, 4, the arrangement being such that contraction of the prop is not adversely affected by pneumatic pressure variations in the annulus 13. The prop is provided with a chamfered base plate 15 bolted thereto. The guard tube 11 may be of corrugated form, see Fig. 2 (not shown).
GB726659A 1959-03-03 1959-03-03 Improvements in or relating to hydraulic pit props Expired GB948255A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB726659A GB948255A (en) 1959-03-03 1959-03-03 Improvements in or relating to hydraulic pit props
DED32761A DE1173053B (en) 1959-03-03 1960-03-02 Hydraulic pit ram

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB726659A GB948255A (en) 1959-03-03 1959-03-03 Improvements in or relating to hydraulic pit props

Publications (1)

Publication Number Publication Date
GB948255A true GB948255A (en) 1964-01-29

Family

ID=9829813

Family Applications (1)

Application Number Title Priority Date Filing Date
GB726659A Expired GB948255A (en) 1959-03-03 1959-03-03 Improvements in or relating to hydraulic pit props

Country Status (2)

Country Link
DE (1) DE1173053B (en)
GB (1) GB948255A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2368860A (en) * 2000-09-15 2002-05-15 Dbt Gmbh Hydraulic prop and seal arrangement
WO2011101716A2 (en) 2010-02-19 2011-08-25 Council Of Scientific And Industrial Research A device for roof support of underground mine/tunnel
CN113431636A (en) * 2021-07-21 2021-09-24 赵佳琛 Intelligent safety monitoring equipment of ore hole convenient to place

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE809903C (en) * 1948-08-25 1951-08-02 Mavor & Coulson Ltd Hydraulic ram for mining operations
GB700790A (en) * 1951-07-19 1953-12-09 Dowty Auto Units Ltd Improvements relating to valves
BE526791A (en) * 1953-02-25
GB774470A (en) * 1955-11-19 1957-05-08 Becorit Grubenausbau Gmbh Improvements relating to hydraulic pit-props

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2368860A (en) * 2000-09-15 2002-05-15 Dbt Gmbh Hydraulic prop and seal arrangement
US6615705B2 (en) 2000-09-15 2003-09-09 Dbt Gmbh Hydraulic cylinder
GB2368860B (en) * 2000-09-15 2004-04-28 Dbt Gmbh A hydraulic cylinder for use as a mine prop
WO2011101716A2 (en) 2010-02-19 2011-08-25 Council Of Scientific And Industrial Research A device for roof support of underground mine/tunnel
CN113431636A (en) * 2021-07-21 2021-09-24 赵佳琛 Intelligent safety monitoring equipment of ore hole convenient to place

Also Published As

Publication number Publication date
DE1173053B (en) 1964-07-02

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