GB1079789A - Improvements in or relating to hydraulically operated mine roof supports - Google Patents

Improvements in or relating to hydraulically operated mine roof supports

Info

Publication number
GB1079789A
GB1079789A GB5323765A GB5323765A GB1079789A GB 1079789 A GB1079789 A GB 1079789A GB 5323765 A GB5323765 A GB 5323765A GB 5323765 A GB5323765 A GB 5323765A GB 1079789 A GB1079789 A GB 1079789A
Authority
GB
United Kingdom
Prior art keywords
mine roof
relating
hydraulically operated
roof supports
operated mine
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
GB5323765A
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.)
Electro Hydraulics Ltd
Original Assignee
Electro Hydraulics Ltd
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 Electro Hydraulics Ltd filed Critical Electro Hydraulics Ltd
Publication of GB1079789A publication Critical patent/GB1079789A/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
    • E21D15/14—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)
  • Actuator (AREA)

Abstract

1,079,789. Hydraulic pit props. ELECTROHYDRAULICS Ltd. Dec. 15, 1965 [July 14, 1965], No. 53237/65. Addition to 977800. Heading E1E. In a modification of the mine roof support claimed in Claim 3 of Specification 977800 means, such as a restricted orifice 18, are provided to produce a pressure drop across the second piston member 2a during extension of the support whereby the second cylinder 2 extends before or concurrently with the first cylinders. The means may comprise valve means or be constituted by a restriction orifice or orifices disposed other than on the member 2a for details of which minor modifications the Specification should be referred to.
GB5323765A 1965-07-14 1965-12-15 Improvements in or relating to hydraulically operated mine roof supports Expired GB1079789A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US47190265A 1965-07-14 1965-07-14

Publications (1)

Publication Number Publication Date
GB1079789A true GB1079789A (en) 1967-08-16

Family

ID=23873436

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5323765A Expired GB1079789A (en) 1965-07-14 1965-12-15 Improvements in or relating to hydraulically operated mine roof supports

Country Status (1)

Country Link
GB (1) GB1079789A (en)

Similar Documents

Publication Publication Date Title
ES374955A1 (en) Method and apparatus for controlling the expansion and retraction of a telescopic cylinder assembly
GB956012A (en) Self-advancing hydraulic roof-supporting frame assembly for use in mines
DK131117B (en) Damping mechanism for hydraulic control cylinders in a closed hydraulic working system.
GB977800A (en) Improvements in or relating to mine roof supports
GB1079789A (en) Improvements in or relating to hydraulically operated mine roof supports
GB1107379A (en) Improvements in or relating to pivotally supported members particularly of mine roof supports
GB1016061A (en) Mine roof support
ES312673A1 (en) A machine for pressure collection. (Machine-translation by Google Translate, not legally binding)
ES345753A1 (en) Improvements in or relating to a Multiported Hydraulic Distributor
GB1223284A (en) A hydraulic roof support system for longwall faces
GB1069905A (en) Improvements relating to roof supports for mine workings
GB1155929A (en) Hydraulic Control System For Mine Roof Props
GB1179758A (en) Hydraulic Mine Support Systems
GB856720A (en) Improvements in roof supports for underground mines
GB1438518A (en) Tunnelling shield
GB1001412A (en) Roof supports suitable for use in mines
GB1194139A (en) Improvements in Hydraulically-Operated Supporting Devices for Mines
GB977352A (en) Self advancing hydraulic roof support frame assembly for face galleries in mines
GB956482A (en) A hydraulic pit prop
GB984790A (en) Improvements in or relating to mine roof supports
GB980581A (en) Improvements in hydraulic roof supports or chocks for mines
GB1049471A (en) Advancing hydraulic mine roof support frame assembly
FR2241427A1 (en) Hydraulic adjustment for vehicle head lights - has one operating and two actuating double acting cylinders connected in series
ES381288A1 (en) A hydraulic, telescopic damping device. (Machine-translation by Google Translate, not legally binding)
GB885496A (en) Improvements relating to mining machinery