Arrangement for supporting roofs of underground excavations

Details Arrangement for supporting roofs of underground excavations Arrangement for supporting roofs of underground excavations

1977-03-31

1978-03-28

Taylor, Dennis L.

E02D 1544

Patent

active

040807940

ABSTRACT:
A mine roof support for underground excavations includes a support adapted to engage the floor of the underground excavation, and a movable roof shield which engages the roof of the underground excavation. A movable rear shield is mounted on the support and is pivotally connected with the roof shield for relative movement thereto about a pivot axis. A pit prop arrangement is provided intermediate the shields and the support for moving the shields relative to each other about the pivot axis between a plurality of inclined positions in which the rear shield is inclined at different angles of inclination relative to the roof shield. A pair of abutment members are respectively provided on the shields for limiting relative movement of the latter beyond a predetermined one of the inclined positions in which the shields are inclined at a predetermined angle of inclination relative to each other.

REFERENCES:
patent: 3885396 (1975-05-01), Snowden et al.
patent: 3921409 (1975-11-01), Blumenthal
patent: 3971225 (1976-07-01), Wertelewski et al.
patent: 3983710 (1976-10-01), Heine

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