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GB816247A - Improvements in hydraulically operated props particularly pit props - Google Patents

Improvements in hydraulically operated props particularly pit props

Info

Publication number
GB816247A
GB816247A GB35173/56A GB3517356A GB816247A GB 816247 A GB816247 A GB 816247A GB 35173/56 A GB35173/56 A GB 35173/56A GB 3517356 A GB3517356 A GB 3517356A GB 816247 A GB816247 A GB 816247A
Authority
GB
United Kingdom
Prior art keywords
props
reservoir
prop
vacuum
hydraulically operated
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
GB35173/56A
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.)
Rheinstahl Wanheim GmbH
Original Assignee
Rheinstahl Wanheim GmbH
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 Rheinstahl Wanheim GmbH filed Critical Rheinstahl Wanheim GmbH
Publication of GB816247A publication Critical patent/GB816247A/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • F04B53/12—Valves; Arrangement of valves arranged in or on pistons
    • F04B53/122—Valves; Arrangement of valves arranged in or on pistons the piston being free-floating, e.g. the valve being formed between the actuating rod and the piston
    • 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
    • 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
    • E21D15/603—Devices for withdrawing props or chocks by means of hydraulic devices
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
    • E21D23/006—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor provided with essential hydraulic devices
    • E21D23/0069—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor provided with essential hydraulic devices without essential advancing shifting devices

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Prostheses (AREA)
  • Pens And Brushes (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
  • Jet Pumps And Other Pumps (AREA)

Abstract

816,247. Hydraulic pit-props. RHEINSTAHL WANHEIM G.m.b.H., [formerly EISENWERK WANHEIM G.m.b.H.]. Nov. 16, 1956 [Dec. 13, 1955], No. 35173/56. Drawings to Specification. Class 20(2) The reservoir of a telescopic hydraulic pit prop is subject to vacuum to assist the return of liquid from the pressure chamber of the props when it is collapsed. This vacuum may be produced by a pump or connection to a vacuum reservoir or as in the prop of Fig. 1 (not shown) in which the reservoir is in the inner prop member, by filling the air-tight reservoir completely when the prop is collapsed so that a vacuum is formed therein when liquid is pumped from the reservoir to the pump pressure chamber to set the prop. The other features of the prop of Fig. 1 are described in Specification 780,345. In Fig. 2 (not shown) there are two props extended by means of a separate pump and reservoir.
GB35173/56A 1955-12-13 1956-11-16 Improvements in hydraulically operated props particularly pit props Expired GB816247A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEE11676A DE1032200B (en) 1955-12-13 1955-12-13 Hydraulically operated support element

Publications (1)

Publication Number Publication Date
GB816247A true GB816247A (en) 1959-07-08

Family

ID=7068144

Family Applications (1)

Application Number Title Priority Date Filing Date
GB35173/56A Expired GB816247A (en) 1955-12-13 1956-11-16 Improvements in hydraulically operated props particularly pit props

Country Status (5)

Country Link
US (1) US3012404A (en)
BE (1) BE552440A (en)
DE (1) DE1032200B (en)
FR (1) FR1167822A (en)
GB (1) GB816247A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3712758A (en) * 1970-09-10 1973-01-23 Int Harvester Co Variable displacement pump
US3882761A (en) * 1973-11-14 1975-05-13 Joseph D Snitgen Fluid stop mechanism

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US16801A (en) * 1857-03-10 George lindsay
US205674A (en) * 1878-07-02 Improvement in hydraulic jacks
US868868A (en) * 1907-04-05 1907-10-22 Peter Kiefer Air-motor.
US1624151A (en) * 1925-07-14 1927-04-12 Aladdin Hydraulic Jack Company Hydraulic jack
US1656430A (en) * 1926-03-16 1928-01-17 Herman D Eberle Hydraulic jack
US1745067A (en) * 1928-10-30 1930-01-28 Erie Hydraulic Mfg Company Hydraulic jack
DE510708C (en) * 1929-02-05 1930-10-22 Albert Hamel Extraction chamber with height-adjustable roof
US2119440A (en) * 1935-12-23 1938-05-31 Timothy C Pomeroy Hydraulic jack
BE486663A (en) * 1948-01-12
DE924686C (en) * 1951-11-30 1955-03-07 Emil Weber Hydraulic setting device for stamp

Also Published As

Publication number Publication date
FR1167822A (en) 1958-12-01
BE552440A (en)
DE1032200B (en) 1958-06-19
US3012404A (en) 1961-12-12

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