Mine roof supports

Details Mine roof supports Mine roof supports

1987-03-27

1988-12-20

Corbin, David H.

Hydraulic and earth engineering

Earth treatment or control

Shoring, bracing, or cave-in prevention

405295, 405296, E21D 1544, E21D 1702

Patent

active

047922613

ABSTRACT:
A self-advancing mine roof support comprising a floor engaging base 11, a roof engaging canopy 12, hydraulic jacks 19a, 19b to urge the base and canopy apart, and a linkage system located towards the rear of the support. The linkage system comprises an inclined shield member 22 pivotally connected to the canopy 12, and at least two links 23, 24 interconnecting the shield and the base. The jacks 19a, 19b, are located substantially halfway along the length of the base and extend substantially vertically from the base. There is a hydraulic jack 18 operable between the roof engaging canopy 12 and the linkage system to effectively counterbalance the projection on the canopy 12 which extends forwardly of the jacks 19a, 19b.

REFERENCES:
patent: 3928981 (1975-12-01), Parker et al.
patent: 4027489 (1977-06-01), Walker et al.
patent: 4236850 (1980-12-01), Koppers et al.
patent: 4380410 (1983-04-01), Bull et al.
patent: 4422807 (1983-12-01), Dettmers et al.

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