Mineral mining installation

Details Mineral mining installation Mineral mining installation

1985-01-30

1987-01-27

Hershkovitz, Abraham

Hydraulic and earth engineering

Earth treatment or control

Shoring, bracing, or cave-in prevention

91170MP, 405299, 92 133, 92 1341, 92 137, E21D 1544

Patent

active

046391690

ABSTRACT:
A mineral mining installation comprises a roof support unit and an advance mechanism. The roof support unit has a floor sill constituted by two floor girders. The advance mechanism comprises a hydraulic advance ram, the advance ram having a relatively-displaceable cylinder and a piston rod, and a device for selectively limiting the working stroke of the ram. The stroke-limiting device comprises a stop fixed to the cylinder of the advance ram, and an adjustable stop member which is mounted on the side wall of one of the floor girders.

REFERENCES:
patent: 3042121 (1962-07-01), Broetzman et al.
patent: 4227833 (1980-10-01), Plester
patent: 4379424 (1983-04-01), Rosenberg
patent: 4449859 (1984-05-01), Terhorst

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