E - Fixed Constructions – 21 – D
Patent
E - Fixed Constructions
21
D
61/67
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
Gewerkschaft Eisenhutte Westfalia
Mccarthy Tetrault Llp
LandOfFree
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