Longwall mining apparatus

Details Longwall mining apparatus Longwall mining apparatus

1977-01-21

1978-08-29

Taylor, Dennis L.

Hydraulic and earth engineering

Earth treatment or control

Shoring, bracing, or cave-in prevention

E21D 1544

Patent

active

041094727

ABSTRACT:
Mining apparatus for use on a mineral face comprising a plurality of roof supports arranged along the face, the roof supports being capable of undergoing advancing movements in sequence, and a manually operable control means on each of at least some of the supports, arranged such that actuation of the control means on one support will enable any other support within a predetermined range of supports adjacent said one support to undergo an advancing movement if the support preceding the said support in the sequence has unergone an advancing movement, the number of supports between any two successive supports which have a control means being less than the number in said predetermined range.

REFERENCES:
patent: 3216201 (1965-11-01), Kibble et al.
patent: 3246576 (1966-04-01), Kibble et al.
patent: 3285015 (1966-11-01), Carnegie et al.
patent: 3434389 (1969-03-01), Griseback
patent: 3889475 (1975-06-01), Allen

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