Advance mechanism for mine roof support units

Details Advance mechanism for mine roof support units Advance mechanism for mine roof support units

1984-07-11

1986-02-18

Corbin, David H.

Hydraulic and earth engineering

Earth treatment or control

Shoring, bracing, or cave-in prevention

299 33, E21D 1544, E21D 2308

Patent

active

045711275

ABSTRACT:
A so-called externally-situated advance mechanism is arranged between the floor sills of adjacent mine roof support units. The advance mechanism includes two laterally-spaced guide rods, and two advance rams positioned above the guide rods. The front ends of the guide rods are connected to a head-piece. A bridge is connected to the two guide rods at a distance behind this head-piece. The piston rods of the two advance rams act on this bridge. The cylinders of the rams are connected, at a distance therebehind, to brackets fixed to the floor sills. Said brackets form guides for the guide rods.

REFERENCES:
patent: 4195953 (1980-04-01), Becker et al.
patent: 4217067 (1980-08-01), Lagodka et al.
patent: 4227833 (1980-10-01), Plester et al.
patent: 4379661 (1983-04-01), Wojaczek et al.
patent: 4390308 (1983-06-01), Becker et al.

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