Roof support suitable for use in mines

Details Roof support suitable for use in mines Roof support suitable for use in mines

1981-11-04

1983-10-25

Corbin, David H.

Hydraulic and earth engineering

Earth treatment or control

Shoring, bracing, or cave-in prevention

E21D 1544, E21D 1705

Patent

active

044115580

ABSTRACT:
A roof support including a roof-engageable member and a cantilever member, one having parallel elongate compartments with a cover member which has a roof-engageable surface and which overlies the compartments, and the other having parallel and rigid elongate elements slidably fitting into the compartments. The other member also includes a plate, having a roof-engageable surface, which defines the profile in plan of that member and which is so secured to the elements as to be relatively slidable with respect to the roof-engageable surface of the cover member. The transverse widths of the roof-engageable surfaces are such that when the roof-engageable member and the cantilever member are caused by actuator means relatively to slide from a retracted condition to an extended or partially-extended condition one of those surfaces effectively forms a full width extension of the other.

REFERENCES:
patent: 3877234 (1975-04-01), Martinko et al.
patent: 3889475 (1975-06-01), Allen
patent: 4217067 (1980-08-01), Lagodka et al.

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