GB959080A - Improvements in or relating to a hydro-pneumatic prop - Google Patents

Improvements in or relating to a hydro-pneumatic prop

Info

Publication number
GB959080A
GB959080A GB44500/62A GB4450062A GB959080A GB 959080 A GB959080 A GB 959080A GB 44500/62 A GB44500/62 A GB 44500/62A GB 4450062 A GB4450062 A GB 4450062A GB 959080 A GB959080 A GB 959080A
Authority
GB
United Kingdom
Prior art keywords
prop
pneumatic
hydro
relating
liquid
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
GB44500/62A
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.)
LEDEEN Inc
Original Assignee
LEDEEN Inc
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 LEDEEN Inc filed Critical LEDEEN Inc
Publication of GB959080A publication Critical patent/GB959080A/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
    • E21D15/60—Devices for withdrawing props or chocks
    • 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

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)
  • Vehicle Body Suspensions (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

959,080. Hydropneumatic pit props. LEDEEN Inc. Nov. 23, 1962 [March 19, 1962], No. 44500/62. Heading E1E. A telescopic pit prop 26, 34 is provided with a pneumatic accumulator 42, 44 in communication with the liquid pressure chamber through ports 38 and has an intermediate annular collar 30 for positioning same on a tubular base 22, 24. Charging valves 46, 52 for nitrogen under pressure and diesel fuel are provided together with a manually-operable release valve 62 controlling the discharge of liquid into the tube 22 by way of passages 64, 66.
GB44500/62A 1962-03-19 1962-11-23 Improvements in or relating to a hydro-pneumatic prop Expired GB959080A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US180591A US3191506A (en) 1962-03-19 1962-03-19 Hydropneumatic prop

Publications (1)

Publication Number Publication Date
GB959080A true GB959080A (en) 1964-05-27

Family

ID=22661020

Family Applications (1)

Application Number Title Priority Date Filing Date
GB44500/62A Expired GB959080A (en) 1962-03-19 1962-11-23 Improvements in or relating to a hydro-pneumatic prop

Country Status (2)

Country Link
US (1) US3191506A (en)
GB (1) GB959080A (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3853038A (en) * 1969-01-21 1974-12-10 Int Harvester Co Unitary cylinder with piston retaining means
DE1954604A1 (en) * 1969-10-30 1971-05-13 Deere & Co Lifting and lowering device, especially for work equipment that can be connected to a vehicle, for example for the mower assembly of combine harvesters
HU183739B (en) * 1981-12-15 1984-05-28 Tatabanyai Szenbanyak Hydraulic cylinder of combination operation particularly prop
US4496033A (en) * 1981-12-28 1985-01-29 Goodyear Aerospace Corporation Dual piston actuator
AT389079B (en) * 1988-05-19 1989-10-10 Engel Gmbh Maschbau CLOSING MECHANISM OF AN INJECTION MOLDING MACHINE
JP4115918B2 (en) * 2003-10-28 2008-07-09 株式会社小松製作所 Hydraulic cylinder
BR102014014086A2 (en) * 2014-06-10 2016-09-27 Nequir Neto Andrade pneumatic base for metal braces
CN106499421B (en) * 2016-11-03 2019-01-08 中国矿业大学 A kind of mechanical constant-resistance individual prop withdrawing technique and recovery method

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1898694A (en) * 1928-10-24 1933-02-21 Sikorsky Aviat Corp Shock absorber
US2165095A (en) * 1936-09-03 1939-07-04 John S Frechette Hydropneumatic jack
US2192909A (en) * 1937-10-04 1940-03-12 Henry S Hoffar Diamond drill
US2337573A (en) * 1937-12-04 1943-12-28 Paul I Schultz Fluid device
US2695764A (en) * 1949-10-01 1954-11-30 Grebe Konrad Mine prop
US2778627A (en) * 1954-02-16 1957-01-22 Miles D Sands Hydraulically adjustable supporting device
US2891635A (en) * 1957-02-26 1959-06-23 Dover Corp Hydraulic safety elevator
US2951558A (en) * 1957-05-02 1960-09-06 Allis Chalmers Mfg Co Shock absorbing device
US3032016A (en) * 1958-07-30 1962-05-01 Manning Maxwell & Moore Hoist with pendant control
US2994301A (en) * 1960-01-11 1961-08-01 Kirsch Jerry Reciprocable hydro-pneumatic motor
US3065738A (en) * 1961-03-06 1962-11-27 Esco Elevators Inc Hydraulic elevator jack units
US3042149A (en) * 1961-06-01 1962-07-03 Allis Chalmers Mfg Co Lift truck mast pulldown cylinder assembly

Also Published As

Publication number Publication date
US3191506A (en) 1965-06-29

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