Nothing Special   »   [go: up one dir, main page]

GB816702A - Improvements relating to hydraulic apparatus for mining machinery - Google Patents

Improvements relating to hydraulic apparatus for mining machinery

Info

Publication number
GB816702A
GB816702A GB979155A GB979155A GB816702A GB 816702 A GB816702 A GB 816702A GB 979155 A GB979155 A GB 979155A GB 979155 A GB979155 A GB 979155A GB 816702 A GB816702 A GB 816702A
Authority
GB
United Kingdom
Prior art keywords
hydraulic
roof
improvements relating
mining machinery
hydraulic apparatus
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
GB979155A
Inventor
Colin Michael Frye
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.)
Dowty Mining Equipment Ltd
Original Assignee
Dowty Mining Equipment Ltd
Filing date
Publication date
Application filed by Dowty Mining Equipment Ltd filed Critical Dowty Mining Equipment Ltd
Publication of GB816702A publication Critical patent/GB816702A/en
Expired legal-status Critical Current

Links

Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D23/00Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
    • E21D23/16Hydraulic or pneumatic features, e.g. circuits, arrangement or adaptation of valves, setting or retracting 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)
  • Framework For Endless Conveyors (AREA)

Abstract

816,702. Mine roof supports. DOWTY MINING EQUIPMENT Ltd. April 5, 1956 [April 4, 1955], No. 9791/55. Drawings to Specification. Class 20(2) In a mine-roof supporting apparatus comprising hydraulic props between roof and floor bars and a hydraulic jack between the floor bar and a mobile structure such as a conveyer, for advancing the supporting apparatus and the conveyer alternately the supply and release of hydraulic fluid to and from the props is through the hollow piston rod and the cylinder chamber of the jack from and to pressure and release means. The subjectmatter of this Specification is described in Specification 823,127.
GB979155A 1955-04-04 Improvements relating to hydraulic apparatus for mining machinery Expired GB816702A (en)

Publications (1)

Publication Number Publication Date
GB816702A true GB816702A (en) 1959-07-15

Family

ID=1629981

Family Applications (1)

Application Number Title Priority Date Filing Date
GB979155A Expired GB816702A (en) 1955-04-04 Improvements relating to hydraulic apparatus for mining machinery

Country Status (1)

Country Link
GB (1) GB816702A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3241654A (en) * 1962-10-10 1966-03-22 Douglas H H Bolton Mining apparatus with automatically advancing jacks
US3246730A (en) * 1964-06-09 1966-04-19 Dowty Mining Equipment Ltd Mining apparatus comprising automatically advancing jacks
CN106194228A (en) * 2016-07-22 2016-12-07 刘丹 A kind of coal-mine hydraulic support of adjustable support point

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3241654A (en) * 1962-10-10 1966-03-22 Douglas H H Bolton Mining apparatus with automatically advancing jacks
US3246730A (en) * 1964-06-09 1966-04-19 Dowty Mining Equipment Ltd Mining apparatus comprising automatically advancing jacks
CN106194228A (en) * 2016-07-22 2016-12-07 刘丹 A kind of coal-mine hydraulic support of adjustable support point

Similar Documents

Publication Publication Date Title
GB823127A (en) Improvements in and relating to mine roof support systems
FR1319925A (en) Improvements made to the pistons of pressurized fluid cylinders, more specifically to the pistons of hydraulic props for mines
GB816702A (en) Improvements relating to hydraulic apparatus for mining machinery
FR1159274A (en) Piston pump for compression cylinders, in particular for hydraulic mine props
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
GB1218370A (en) Advancing mine roof support units for mine workings
GB823586A (en) Improvements in or relating to mine roof supports
GB930838A (en) Improvements in or relating to roof supports for mines and the like
GB999943A (en) Improved mine roof support means
GB846730A (en) Improvements in or relating to hydraulic mine supporting devices
GB977352A (en) Self advancing hydraulic roof support frame assembly for face galleries in mines
GB1072893A (en) Apparatus for shoring up mining galleries
GB874435A (en) Advancing mine roof support structure for mine working faces
GB1196344A (en) Shield for Constructing Tunnels
GB936483A (en) Double-acting hydraulic shifting piston and cylinder for coal face conveyors
GB882947A (en) Improvements in or relating to mine roof support systems in combination with yielding pushing jacks
GB856720A (en) Improvements in roof supports for underground mines
GB754108A (en) Hydraulic roof supports for mines
GB935843A (en) A travelling support frame for the support of galleries in mines
GB797707A (en) A method and an apparatus for ascertaining the load carrying capacity of telescopic components of mine roof supporting structures
GB885496A (en) Improvements relating to mining machinery
SU144130A1 (en) Hydraulic feeder long stroke drill
GB845727A (en) Improvements relating to mine roof support devices
GB980581A (en) Improvements in hydraulic roof supports or chocks for mines