Hydraulic and earth engineering – Earth treatment or control – Shoring – bracing – or cave-in prevention
Patent
1981-09-10
1983-06-28
Taylor, Dennis L.
Hydraulic and earth engineering
Earth treatment or control
Shoring, bracing, or cave-in prevention
405291, 405295, E21D 2300
Patent
active
043903088
ABSTRACT:
A roof support assembly is constituted by a plurality of roof support units and a plurality of advance mechanisms. The units are positioned side-by-side along a longwall face of a mineral mining working. Each advance mechanism comprises a pair of generally parallel hydraulic advance rams and a guide rod system constituted by a pair of resilient generally parallel guide rods. Each guide rod system is attached, at one end, to a conveyor extending along the longwall face. The other end of each guide rod of each advance mechanism is attached to a respective slide piece which is slidably guided on a respective guide rail which is attached to a respective floor girder of a roof support unit. The slide pieces are attached to the piston rods of the hydraulic advance rams. The cylinders of the hydraulic advance rams are attached to one of the adjacent floor girders, and the slide piece attached to the piston rod of hydraulic advance ram is attached to the guide rod system. The slide piece attached to the piston rod of the hydraulic advance ram is attached to the other floor girder.
REFERENCES:
patent: 3482878 (1969-12-01), Floter
patent: 4184791 (1980-01-01), Becker et al.
patent: 4187042 (1980-02-01), Plevak et al.
patent: 4227833 (1980-10-01), Plester et al.
Becker Kunibert
Kirchbrucher Rudiger
Lagodka Gunter
Pohlmann Klaus-Dieter
Gewerkschaft Eisenhutte Westfalia
Gungor John A.
Taylor Dennis L.
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