Patent ID: 7540693

Claim:
A movable tubbing unit for pillar recovery in chamber-and-pillar working, comprising: at least two horizontal support beams separated by a predetermined distance; at least two floor runners; a plurality of vertically-adjustable props, at least two of the plurality of vertically-adjustable props being movably attached to each horizontal support beam; a plurality of intermediate guides; a transfer frame positioned between the at least two horizontal support beams and movably connected to at least one of the horizontal support beams by at least one intermediate guide; and at least one steering gear positioned between two of the plurality of vertically-adjustable props, the steering gear being directly movably attached to at least one horizontal support beam and directly movably attached to at least one floor runner, wherein each of the vertically adjustable props are operable for vertically extending to move a respective horizontal support beam into contact with a roof in a pillar gallery.