Mine-roof support control means

Details Mine-roof support control means Mine-roof support control means

1982-03-19

1984-10-16

Garrett, Robert E.

Fluid handling

Systems

Programmer or timer

13762418, 91461, 91170MP, 91517, F15B 910

Patent

active

044768982

ABSTRACT:
A control device for the sequential control of an advancing mine-roof support comprising pressure-controlled directional control valves alternately connectable to a high pressure line and to a return line in order to convert a pressure pulse into a switching step at the main control unit of the advancing mine-roof support and for transmitting an answering pressure pulse signalling the completion of the workstage for continuing the sequence.

REFERENCES:
patent: 3246576 (1966-04-01), Kibble et al.
patent: 3601998 (1971-08-01), Bower
patent: 3821880 (1974-07-01), Weirich et al.
patent: 4191498 (1980-03-01), Weirich et al.

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