1975-07-15
1976-12-14
Taylor, Dennis L.
E21D 1544
Patent
active
039967530
ABSTRACT:
The invention is concerned with a mine roof support, for use at a mineral face, comprising a base member, extensible props means mounted on said base member, a roof-engaging structure mounted on said prop means for application thereby to a roof to be supported, a multi-part flushing screen shield including upper and lower parts arranged on the goaf side of the support, first hinge means mutually connecting the parts of said screening shield ad having a flexible member connecting the upper part of the shield and the roof-engaging structure and which permits movements of the upper part of the shield about an axis lying transversely to the longitudinal direction of the mineral face, and second hinge means connecting the lower part of the shield with the base member and having a hinge axis which lies transversely to the longitudinal direction of the mineral face, whereby the screening shield is pivotally movable with respect to the support not only towards and away from the mineral face but also parallel thereto. The present invention provides such a mine roof support with prop aligning means, including a cylinder incorporating aligning force producing means, arranged between props of the support on the one hand and the base member or parts connected with the base member on the other hand and which aligning means also serve for swivelling of the flushing screen about the hinge means between the base member and the lower part of the flushing shield. The aligning devices may have pressure-medium cylinders which serve for application of the aligning forces or said aligning devices may have resilient restoring elements.
REFERENCES:
patent: 3302411 (1967-02-01), Wilkenloh et al.
patent: 3324664 (1967-06-01), Allen
patent: 3483705 (1969-12-01), Roberts
patent: 3530490 (1970-09-01), Ward et al.
Lubojatsky Walter
Wertelewski Wilhelm
Becorit Grubenausbau GmbH
Taylor Dennis L.
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