GB1251968A - - Google Patents

Info

Publication number
GB1251968A
GB1251968A GB1251968DA GB1251968A GB 1251968 A GB1251968 A GB 1251968A GB 1251968D A GB1251968D A GB 1251968DA GB 1251968 A GB1251968 A GB 1251968A
Authority
GB
United Kingdom
Prior art keywords
flow control
rams
mine roof
base
control means
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 GB1251968A publication Critical patent/GB1251968A/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
    • E21D23/16—Hydraulic or pneumatic features, e.g. circuits, arrangement or adaptation of valves, setting or retracting devices
    • E21D23/18—Hydraulic or pneumatic features, e.g. circuits, arrangement or adaptation of valves, setting or retracting devices of advancing mechanisms

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)
  • Fluid-Pressure Circuits (AREA)

Abstract

1,251,968. Means for effecting correct alignment of mine roof suport units. DOWTY MINING EQUIPMENT Ltd. 15 Jan., 1969 [1 Feb., 1968], No. 5216/68. Heading E1P. In a self advancing mine roof support arrangement comprising two rams 46, 47 connecting a conveyor 40 to the prop unit 41. A pump 59 supplies the hydraulic fluid to the rams via line 55, 57 and a control valve 56. In order to resist slewing of the base flow control means 58, 65 are provided in the circuit as shown and actuated by a pivoted lever 62. In a modification the flow control means is operated automatically, the pistons of said means being moved by movement of the base (Fig. 1, not shown).
GB1251968D 1968-02-01 1968-02-01 Expired GB1251968A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB521668 1968-02-01

Publications (1)

Publication Number Publication Date
GB1251968A true GB1251968A (en) 1971-11-03

Family

ID=9791889

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1251968D Expired GB1251968A (en) 1968-02-01 1968-02-01

Country Status (1)

Country Link
GB (1) GB1251968A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3991580A (en) * 1974-11-15 1976-11-16 Gullick Dobson Limited Mine roof supports
FR2457963A1 (en) * 1979-05-02 1980-12-26 Gewerk Eisenhuette Westfalia DEVICE FOR AUTOMATICALLY CONTROLLING THE EXIT OF EXTENSIONS OF SUPPORTING CAPS BASED ON THE PROGRESS OF THE FELLING

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3991580A (en) * 1974-11-15 1976-11-16 Gullick Dobson Limited Mine roof supports
FR2457963A1 (en) * 1979-05-02 1980-12-26 Gewerk Eisenhuette Westfalia DEVICE FOR AUTOMATICALLY CONTROLLING THE EXIT OF EXTENSIONS OF SUPPORTING CAPS BASED ON THE PROGRESS OF THE FELLING

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees