Breast roof support system for longwall mining

Details Breast roof support system for longwall mining Breast roof support system for longwall mining

1976-12-09

1978-06-13

Taylor, Dennis L.

E21D 1544

Patent

active

040941531

ABSTRACT:
In a longwall mining operation the roof of the breast extending laterally from a heading or gangway is supported by at least two pairs of pit props. Each pair is substantially identical, having an elongated upper part and an elongated lower part displaceable away from each other by hydraulic rams. In addition a shield is provided extending vertically between the upper and lower parts of each prop at the upstream end of the prop turned toward the stowage area. In addition the props furthest from the mine are substantially longer than the props closest to the mine and are provided at their ends turned toward the stowage area with side shields forming a closed chamber so as carefully to segregate the gob from the breast. The upper parts of the props are formed of several articulated sections so as to allow these upper parts to conform to the shape of the roof. In addition that prop closest to the mine is provided with laterally extending upwardly pivotal flaps usable to support the roof at the opening between the breast and the mine.

REFERENCES:
patent: 3524321 (1970-08-01), Wilkenloh et al.
patent: 3848420 (1974-11-01), Allen et al.
patent: 4002036 (1977-01-01), Jeffrey et al.
patent: 4010618 (1977-03-01), Walker et al.

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