E21D23/00 - CPC Classification

Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor

• E21D23/0004 » {along the working face} 16
• E21D23/0047 » {without essential shifting devices} 2
• E21D23/0052 » {with advancing shifting devices connected therewith} 6
• E21D23/0056 » {with individual advancing shifting devices} 0
• E21D23/006 » {provided with essential hydraulic devices} 6
• E21D23/0082 » {specially adapted for vertical or steep gradient seams} 1
• E21D23/0086 » {in galleries} 2
• E21D23/03 » having protective means, e.g. shields, for preventing or impeding entry of loose material into the working space or support 17
• E21D23/04 » Structural features of the supporting construction, e.g. linking members between adjacent frames or sets of props; Means for counteracting lateral sliding on inclined floor 11
• E21D23/08 » Advancing mechanisms 5
• E21D23/12 » Control, e.g. using remote control 33
• E21D23/16 » Hydraulic or pneumatic features, e.g. circuits, arrangement or adaptation of valves, setting or retracting devices 15

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