Method for controlling a hydraulically operated mine roof suppor

Details Method for controlling a hydraulically operated mine roof suppor Method for controlling a hydraulically operated mine roof suppor

1979-07-10

1981-04-28

Taylor, Dennis L.

Hydraulic and earth engineering

Earth treatment or control

Ground stabilization or reinforcement

E21D 1544, E21D 2316

Patent

active

042642370

ABSTRACT:
A method of operating a hydraulically expandable and collapsable prop of a mine roof support in which the cylinder space of the prop below the piston therein normally communicates with an overpressure valve adjusted to a pressure equal to the setting pressure of the prop, wherein the method comprises the steps of interrupting communication of the overpressure valve with the cylinder space of the prop while the latter is expanded and restoring the communication when the prop is pressed against the mine roof while the cylinder space is disconnected from the hydraulic pressure circuit and an arrangement for carrying out the method.

REFERENCES:
patent: 3246576 (1966-04-01), Kibble et al.
patent: 3421795 (1969-01-01), Heyer et al.

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