ZA988351B - Roof supports - Google Patents

Roof supports

Info

Publication number
ZA988351B
ZA988351B ZA988351A ZA988351A ZA988351B ZA 988351 B ZA988351 B ZA 988351B ZA 988351 A ZA988351 A ZA 988351A ZA 988351 A ZA988351 A ZA 988351A ZA 988351 B ZA988351 B ZA 988351B
Authority
ZA
South Africa
Prior art keywords
roof supports
roof
supports
Prior art date
Application number
ZA988351A
Inventor
Peter Eillott-Moore
Original Assignee
Joy Mm Delaware Inc
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 Joy Mm Delaware Inc filed Critical Joy Mm Delaware Inc
Publication of ZA988351B publication Critical patent/ZA988351B/en

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
    • 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
ZA988351A 1997-09-20 1998-09-11 Roof supports ZA988351B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9719968A GB2329429A (en) 1997-09-20 1997-09-20 Improvements in and relating to roof supports

Publications (1)

Publication Number Publication Date
ZA988351B true ZA988351B (en) 1999-03-15

Family

ID=10819345

Family Applications (1)

Application Number Title Priority Date Filing Date
ZA988351A ZA988351B (en) 1997-09-20 1998-09-11 Roof supports

Country Status (4)

Country Link
AU (1) AU8608698A (en)
DE (1) DE19842460A1 (en)
GB (1) GB2329429A (en)
ZA (1) ZA988351B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8876218B2 (en) * 2009-07-16 2014-11-04 Tiefenbach Control Systems Gmbh Hydraulic circuit for longwall support
DE112010002945A5 (en) * 2009-07-16 2012-10-25 Tiefenbach Control Systems Gmbh Hydraulic circuit for longwall construction
PL2378060T3 (en) * 2010-04-16 2013-05-31 S A Armstrong Ltd Improvements in and Relating to Long Wall Hydraulic Supply Systems

Also Published As

Publication number Publication date
GB9719968D0 (en) 1997-11-19
DE19842460A1 (en) 1999-03-25
GB2329429A (en) 1999-03-24
AU8608698A (en) 1999-04-01

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