Mine roof support

Details Mine roof support Mine roof support

1977-03-09

1979-01-02

Taylor, Dennis L.

Hydraulic and earth engineering

Earth treatment or control

Shoring, bracing, or cave-in prevention

405299, E21D 1544

Patent

active

041320816

ABSTRACT:
A mine roof support comprising a floor-engageable member, a roof-engageable member such as a canopy extending forwardly of the floor-engaging member, a first extensible leg secured between the floor-engaging member and the canopy, a linkage, which may include a shield, mounted on the floor-engaging member and pivotally connected to the roof-engageable member at its rear end and a second extensible leg secured between the floor-engaging member and the linkage. The linkage is preferably operative to constrain its pivotal connection to the canopy to move upward and downward in a fixed path relative to the floor-engaging member.

REFERENCES:
patent: 3295331 (1967-01-01), Blaser et al.
patent: 3328968 (1967-07-01), Weirich
patent: 3855805 (1974-12-01), Nakajima

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