GB1225349A - - Google Patents

Info

Publication number
GB1225349A
GB1225349A GB1225349DA GB1225349A GB 1225349 A GB1225349 A GB 1225349A GB 1225349D A GB1225349D A GB 1225349DA GB 1225349 A GB1225349 A GB 1225349A
Authority
GB
United Kingdom
Prior art keywords
piston
ram
disposed
see
mine roof
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
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 filed Critical
Publication of GB1225349A publication Critical patent/GB1225349A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • E21D23/0078—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 with individual 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)
  • Actuator (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Lining And Supports For Tunnels (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

1,225,349. Mine roof supports. GULLICK DOBSON Ltd. 25 April, 1969 [5 Sept., 1968], No. 21186/69. Heading E1P. A mine roof support assembly, see Fig. 1 (not shown), is provided with a leg alignment device which is disposed between a leg 2 and a base 4 and consists of a hydraulic ram having inlet means 14 for pressure fluid to extend and contract is so that it can assume an intermediate position. The ram is provided with a piston 7 with a hollow rod 8 in the form of a cylinder receiving a second piston 9, the arrangement being in fluid intercommunication as shown and provided with adjustment stops 19, 20 to control the stroke of the pistons. In a modification, see Fig. 3 (not shown), the device consists of two rams arranged in parallel with pressure inlets so disposed that the piston rod of one ram is extended whilst the other is contracted. In a further modification, Fig. 4 (not shown), a ram is provided having each chamber on either side of its piston connected to an associated cylinder with a free piston disposed therein, the associated cylinders being both connected to a common pressure source.
GB1225349D 1968-09-05 1969-04-25 Expired GB1225349A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
LU56825 1968-09-05

Publications (1)

Publication Number Publication Date
GB1225349A true GB1225349A (en) 1971-03-17

Family

ID=19725711

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1225349D Expired GB1225349A (en) 1968-09-05 1969-04-25

Country Status (6)

Country Link
US (1) US3590586A (en)
JP (1) JPS493603B1 (en)
CS (1) CS170140B2 (en)
DE (1) DE1801564B1 (en)
GB (1) GB1225349A (en)
LU (1) LU56825A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113638753A (en) * 2021-08-16 2021-11-12 哈尔滨学院 Supporting construction is used in civil engineering construction

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2924380A1 (en) * 1979-06-16 1981-01-08 Gewerk Eisenhuette Westfalia LIFT LIMITING DEVICE FOR PISTON PISTON GEARBOXES, ESPECIALLY FOR SCREW AND BACK CYLINDER FOR THE BACK OF A CONVEYOR AND / OR A SCREW EXTENSION IN MINING UNDERGROUND OPERATIONS
DE102013107305B4 (en) 2013-07-10 2022-11-24 Herrmann Ag Lifting device and lifting platform with such a lifting device

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2714505A (en) * 1948-05-01 1955-08-02 Joy Mfg Co Apparatus for mine roof control
US2859022A (en) * 1955-04-04 1958-11-04 Dowty Mining Equipment Ltd Hydraulic roof supports and conveyor feed jacks
DE1087098B (en) * 1956-01-27 1960-08-18 Gewerk Eisenhuette Westfalia Progressive expansion for mining operations
DE1146829B (en) * 1960-04-27 1963-04-11 Gewerk Eisenhuette Westfalia Moving hydraulic support frame
GB934062A (en) * 1960-09-09 1963-08-14 Gullick Ltd Improvements in or relating to roof supports for mines
GB1001411A (en) * 1960-09-15 1965-08-18 Dowty Mining Equipment Ltd Roof supports suitable for use in mines
GB985401A (en) * 1961-05-13 1965-03-10 Rheinstahl Wanheim Gmbh Improvements in advanceable mine roof support assemblies
DE1126821B (en) * 1961-07-19 1962-04-05 Hemscheidt Maschf Hermann Expansion team for steep storage
GB1036663A (en) * 1964-04-03 1966-07-20 Gullick Ltd Improvements in or relating to mine roof and like supports
DE1257720B (en) * 1966-02-17 1968-01-04 Bergwerksverband Gmbh Control for a moving extension frame
GB1167614A (en) * 1966-02-17 1969-10-15 Bergwerksverband Gmbh Method and Control System for Adjusting a Pit Prop Axis

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113638753A (en) * 2021-08-16 2021-11-12 哈尔滨学院 Supporting construction is used in civil engineering construction
CN113638753B (en) * 2021-08-16 2024-01-05 哈尔滨学院 Supporting construction for civil engineering construction

Also Published As

Publication number Publication date
LU56825A1 (en) 1970-03-05
JPS493603B1 (en) 1974-01-28
US3590586A (en) 1971-07-06
CS170140B2 (en) 1976-08-27
DE1801564B1 (en) 1970-07-30

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLNP Patent lapsed through nonpayment of renewal fees