Equipment for remotely operating self-advancing supports used at

Details Equipment for remotely operating self-advancing supports used at Equipment for remotely operating self-advancing supports used at

1976-12-15

1978-05-16

Shapiro, Jacob

91170MP, E21D 1544

Patent

active

040891828

ABSTRACT:
Equipment for remotely operating by transmitted signals self-advancing supports which are used with a shearer at a long-walled pit face in a coal mine comprises electromagnetic valves, one of which is connected to a hydraulic cylinder for lowering the roof plate of a self-advancing support and moving the support toward the pit face and the other of which is connected to another hydraulic cylinder for lifting the roof plate of the support, a signal converter and a receiver are connected through a cable to the electromagnetic valves including those of the other self-advancing supports in such a manner that each of the electromagnetic valves is specified through the matrix circuit system; and a portable transmitter is provided for transmitting operation signals to the receiver through the radio system.

REFERENCES:
patent: 3259024 (1966-07-01), Kibble et al.
patent: 3285015 (1966-11-01), Carnegie et al.
patent: 3672176 (1972-06-01), Groetschel

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