Method of controlling hydraulically actuatable arrangement in un

Details Method of controlling hydraulically actuatable arrangement in un Method of controlling hydraulically actuatable arrangement in un

1986-08-05

1987-09-15

Corbin, David H.

Hydraulic and earth engineering

Earth treatment or control

Shoring, bracing, or cave-in prevention

405302, E21D 2312

Patent

active

046936408

ABSTRACT:
A method of controlling a plurality of hydraulically-actuated arrangements in underground excavations, comprises the steps of providing an electrical power supply, connecting a plurality of control devices with said power supply and interconnecting the control devices with one another, arranging a plurality of current-suppliable consumers to be connected with the control devices, comparing in each of the control devices a coded information about a number of consumers which have been current supplied from the power supply with a maximum possible number of consumers which can be supplied from the power supply, determining from the comparison the number of the consumers which still can be current-supplied and obtaining by the control device a release for current supplying such consumers, adding consumers which are released by the control device and current supplied with the consumers which have been indicated in the control device as current-supplied, and further transferring the result of the addition in coded form to a next control device.

REFERENCES:
patent: 3664138 (1972-05-01), Cooper
patent: 4398851 (1983-08-01), Geuns et al.
patent: 4451181 (1984-05-01), Trumper et al.
patent: 4518285 (1985-05-01), Weber et al.

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