FR2175735A1 - - Google Patents

Info

Publication number
FR2175735A1
FR2175735A1 FR7246880A FR7246880A FR2175735A1 FR 2175735 A1 FR2175735 A1 FR 2175735A1 FR 7246880 A FR7246880 A FR 7246880A FR 7246880 A FR7246880 A FR 7246880A FR 2175735 A1 FR2175735 A1 FR 2175735A1
Authority
FR
France
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.)
Granted
Application number
FR7246880A
Other languages
French (fr)
Other versions
FR2175735B1 (en
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.)
Gewerkschaft Eisenhutte Westfalia GmbH
Original Assignee
Gewerkschaft Eisenhutte Westfalia 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 Gewerkschaft Eisenhutte Westfalia GmbH filed Critical Gewerkschaft Eisenhutte Westfalia GmbH
Publication of FR2175735A1 publication Critical patent/FR2175735A1/fr
Application granted granted Critical
Publication of FR2175735B1 publication Critical patent/FR2175735B1/fr
Expired legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH 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
    • E21D23/16—Hydraulic or pneumatic features, e.g. circuits, arrangement or adaptation of valves, setting or retracting devices
    • E21D23/26—Hydraulic or pneumatic control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/20—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors controlling several interacting or sequentially-operating members

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)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Chain Conveyers (AREA)
FR7246880A 1972-03-16 1972-12-29 Expired FR2175735B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2212686A DE2212686C3 (en) 1972-03-16 1972-03-16 Group sequence control for the automatic backing of an expansion group

Publications (2)

Publication Number Publication Date
FR2175735A1 true FR2175735A1 (en) 1973-10-26
FR2175735B1 FR2175735B1 (en) 1976-08-27

Family

ID=5839079

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7246880A Expired FR2175735B1 (en) 1972-03-16 1972-12-29

Country Status (5)

Country Link
US (1) US3906738A (en)
BE (1) BE794193A (en)
DE (1) DE2212686C3 (en)
FR (1) FR2175735B1 (en)
GB (1) GB1420862A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2502689A1 (en) * 1981-03-26 1982-10-01 Gewerk Eisenhuette Westfalia ELECTRO-HYDRAULIC SUPPORT CONTROL FOR UNDERGROUND MINING

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4159671A (en) * 1974-08-20 1979-07-03 Allen Archelaius D Self-advancing mine roof supports
GB1531246A (en) * 1975-07-29 1978-11-08 Gullick Dobson Ltd Mine roof support control systems
DE2700829C2 (en) * 1977-01-11 1986-04-17 Gewerkschaft Eisenhütte Westfalia, 4670 Lünen Hydraulic extension control
JPS53114704A (en) * 1977-02-28 1978-10-06 Taiheiyo Eng Operating device of selfftravelling frame* etc*
DE2851937C2 (en) * 1978-12-01 1986-05-28 Gewerkschaft Eisenhütte Westfalia, 4670 Lünen Control valve, especially for hydraulic support in mining operations
GB2095425B (en) * 1981-02-25 1984-06-27 Dobson Park Ind Mine roof support control systems
GB2142074B (en) * 1983-06-21 1987-04-23 Dobson Park Ind Control of mine roof supports
DE3404302C1 (en) * 1984-02-08 1985-06-05 Hermann Hemscheidt Maschinenfabrik Gmbh & Co, 5600 Wuppertal Control device for a hydraulic stepping frame
DE3801593A1 (en) * 1988-01-21 1989-08-03 Hemscheidt Maschf Hermann GROUP CONTROL FOR HYDRAULIC SCREAM EXTENSION
DE3824522A1 (en) * 1988-07-20 1990-01-25 Kloeckner Becorit Gmbh METHOD FOR BACKING A STRUCTURAL BUILDING
US5428959A (en) * 1994-08-01 1995-07-04 Illinois Tool Works Inc. Pneumatic control circuit
CN112524109A (en) * 2020-12-02 2021-03-19 辽宁工程技术大学 Four-point hoisting balance method for hydraulic support

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2548198A (en) * 1945-11-15 1951-04-10 Charles H Cosnett Dual control for the throttle and reversing means of pressure fluid engines
US2540710A (en) * 1947-08-21 1951-02-06 Westinghouse Air Brake Co Fluid pressure control apparatus
US2940428A (en) * 1954-08-10 1960-06-14 Bendix Aviat Corp Parallel hydraulic control system
GB961225A (en) * 1961-06-12 1964-06-17 Electro Hydraulics Ltd Hydraulically operated advancing roof support systems
GB959492A (en) * 1961-11-21 1964-06-03 Dowty Technical Developements Mining apparatus
GB1023827A (en) * 1963-06-21 1966-03-23 Dowty Mining Equipment Ltd Roof support assembly
DE1249796B (en) * 1963-09-06 1967-09-14

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2502689A1 (en) * 1981-03-26 1982-10-01 Gewerk Eisenhuette Westfalia ELECTRO-HYDRAULIC SUPPORT CONTROL FOR UNDERGROUND MINING

Also Published As

Publication number Publication date
FR2175735B1 (en) 1976-08-27
US3906738A (en) 1975-09-23
DE2212686C3 (en) 1979-03-22
BE794193A (en) 1973-05-16
GB1420862A (en) 1976-01-14
DE2212686A1 (en) 1973-09-20
DE2212686B2 (en) 1978-07-20

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Legal Events

Date Code Title Description
ST Notification of lapse