Hydraulic control means

Details Hydraulic control means Hydraulic control means

1979-07-26

1981-12-22

Pate, III, William F.

Hydraulic and earth engineering

Earth treatment or control

Shoring, bracing, or cave-in prevention

91170MP, E21D 2316

Patent

active

043068227

ABSTRACT:
Hydraulic control means are provided for controlling an auxiliary shield positioned at one side of the roof shield of a mine roof support unit. The auxiliary shield is moved laterally of its roof shield by means of three hydraulic rams and the roof shield is supported by hydraulic props. The hydraulic control means comprises a control valve device and two pilot check valves. One pilot check valve is positioned in a line leading from the control valve device to two hydraulic rams which act in tandem. The other pilot check valve is positioned in a line leading from the control valve device to the other hydraulic ram. The pilot check valves are actuated in dependence upon the pressurization of the hydraulic props whereby the hydraulic rams are depressurised when the props are pressurized and vice versa.

REFERENCES:
patent: 3728863 (1973-04-01), Hidasi
patent: 4002036 (1977-01-01), Jeffrey et al.
patent: 4041714 (1977-08-01), Allen

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