Mine roof support unit

E - Fixed Constructions – 21 – D

Patent

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E21D 15/52 (2006.01) E21D 23/04 (2006.01) E21D 23/08 (2006.01)

Patent

CA 1232464

ABSTRACT OF THE DISCLOSURE A mine roof support unit includes a pair of generally parallel floor girders, and an advance mechanism positioned between the floor girders. The advance mechanism comprises a hydraulic advance ram and a guide rod system. The advance ram is pivotal connected between the guide rod system and a cross member which interconnects the floor girders. The guide rod system is attachable to a longwall conveyor positioned adjacent to a work face. The cross member is engageable with the floor girders in such a manner that the floor girders are relatively displaceable in a vertical direction. Each of the floor girders is provided with a respective hydraulic lifting ram, the arrangement being such that the lifting rams can be operated to lift one of the floor girders relative to the other floor girder.

471216

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