Mine roof support control systems

Details Mine roof support control systems Mine roof support control systems

1975-11-25

1977-09-27

Taylor, Dennis L.

E21D 1544

Patent

active

040502562

ABSTRACT:
A control system for a self-advancing mine roof support includes function selection hydraulic valve means responsive to coded electrical signals from remote means for selecting a desired function, and means for comparing the coded signals with other signals representing the instantaneous function state of the valve means. Usually each of a plurality of supports incorporates the remote means of a neighboring support.

REFERENCES:
patent: 3202058 (1965-08-01), Bolton et al.
patent: 3207041 (1965-09-01), Phillips
patent: 3285015 (1966-11-01), Carnegie et al.
patent: 3507122 (1970-04-01), Schmidt
patent: 3643445 (1972-02-01), Schmidt
patent: 3821880 (1974-07-01), Weirich et al.
patent: 3906738 (1975-09-01), Weirich et al.

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