GB821645A - Improvements in or relating to hydraulic pit props - Google Patents

Improvements in or relating to hydraulic pit props

Info

Publication number
GB821645A
GB821645A GB23671/56A GB2367156A GB821645A GB 821645 A GB821645 A GB 821645A GB 23671/56 A GB23671/56 A GB 23671/56A GB 2367156 A GB2367156 A GB 2367156A GB 821645 A GB821645 A GB 821645A
Authority
GB
United Kingdom
Prior art keywords
ring
piston
rubber
relating
gap
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
GB23671/56A
Other languages
English (en)
Inventor
Wilfred Allsop
Frank Cowlishaw
Lawrence William Taylor
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
Priority to NL217834D priority Critical patent/NL217834A/xx
Application filed by Dobson Ltd W E & F, WE&F Dobson Ltd filed Critical Dobson Ltd W E & F
Priority to GB23671/56A priority patent/GB821645A/en
Priority to FR1175841D priority patent/FR1175841A/fr
Priority to BE557913D priority patent/BE557913A/xx
Publication of GB821645A publication Critical patent/GB821645A/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
    • E21D15/45—Hydraulic, pneumatic, or hydraulic-pneumatic props having closed fluid system, e.g. with built-in pumps or accumulators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
    • B60K35/60—Instruments characterised by their location or relative disposition in or on vehicles
    • 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
    • E21D15/517—Extension elements
    • 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
    • E21D15/54—Details of the ends of props

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Structural Engineering (AREA)
  • Geology (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Sealing Devices (AREA)
  • Actuator (AREA)
GB23671/56A 1956-08-01 1956-08-01 Improvements in or relating to hydraulic pit props Expired GB821645A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
NL217834D NL217834A (fr) 1956-08-01
GB23671/56A GB821645A (en) 1956-08-01 1956-08-01 Improvements in or relating to hydraulic pit props
FR1175841D FR1175841A (fr) 1956-08-01 1957-05-29 Perfectionnements relatifs aux étais hydrauliques de mines
BE557913D BE557913A (fr) 1956-08-01 1957-05-29

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB23671/56A GB821645A (en) 1956-08-01 1956-08-01 Improvements in or relating to hydraulic pit props

Publications (1)

Publication Number Publication Date
GB821645A true GB821645A (en) 1959-10-14

Family

ID=10199397

Family Applications (1)

Application Number Title Priority Date Filing Date
GB23671/56A Expired GB821645A (en) 1956-08-01 1956-08-01 Improvements in or relating to hydraulic pit props

Country Status (4)

Country Link
BE (1) BE557913A (fr)
FR (1) FR1175841A (fr)
GB (1) GB821645A (fr)
NL (1) NL217834A (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1215091B (de) * 1961-06-29 1966-04-28 Guenther W Hammer Auswechselbarer Stempelschuh fuer Grubenstempel
GB8711378D0 (en) * 1987-05-14 1987-06-17 Nichols Hydraulic Products Ltd Applying pressure to closed door

Also Published As

Publication number Publication date
FR1175841A (fr) 1959-04-02
NL217834A (fr)
BE557913A (fr) 1957-06-15

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