Mine roof supports

Details Mine roof supports Mine roof supports

1978-04-18

1979-02-13

Taylor, Dennis L.

Hydraulic and earth engineering

Earth treatment or control

Shoring, bracing, or cave-in prevention

E21D 1544

Patent

active

041393260

ABSTRACT:
A mine roof support comprises a plurality of hydraulically extensible chock legs articulated at upper ends thereof to one or more roof beams and at lower ends thereof to one or more base members, a shield pivotally connected to a rearward part of the base member(s) and also pivotally connected to a rearward part of the roof beam(s) with a permanently loaded force applying means reacting via the shield on the roof beam(s), in such a manner that the force applying means resists displacement of the roof beam(s) and, upon a sufficient fall in pressure in the chock legs, restores any displaced chock legs to a predetermined position.

REFERENCES:
patent: 3324664 (1967-06-01), Allen
patent: 3357742 (1967-12-01), Dommann et al.
patent: 3383866 (1968-05-01), Groetschel
patent: 4030308 (1977-06-01), Dudley et al.

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