Loading patent…
AssigneeGebr. Eickhoff, Maschinenfabrik und Eisengiesserei m.b.H.
InventorsKarl-Heinz Weber, Wolfgang Beckmann, Hartmut Gebauer
Estimating the term…
A control system for longwall mining roof supports which are controlled in dependence on the position of the mining machine at any time. All of the roof supports are connected to a central computer via common conductors. Each of the roof supports includes a control unit having a code corresponding to the number of that support. This code serves as an address and enables the central computer to transmit its control command signals positively, in response to the mining machine position signals, through an appropriate address control unit for a particular roof support. In order to enable roof supports to be actuated manually also, the control units of all of the roof supports are connected to the central computer by two common conductors, one of which carries an automatic enable signal and the other of which carries a manual enable signal. The system is such that whenever automatic command signals are being transmitted by the computer, manual control cannot be effected; and when manual control signals are being employed, automatic control cannot be effected.
In a control system for longwall mining roof supports wherein the supports are controlled by a computer in dependence on the position of a longwall mining machine at any time, the computer being connected to individual control units for the roof supports through common electrical conductors, and wherein each control unit is provided with manual control pushbuttons and associated control circuitry for controlling the roof support independently of command signals received from said computer, the improvement in said control system comprising:
Dependencies are inferred from the claim text.