Mine roof supports

Details Mine roof supports Mine roof supports

1983-02-23

1984-09-25

Taylor, Dennis L.

Hydraulic and earth engineering

Earth treatment or control

Ground stabilization or reinforcement

405291, 91170MP, E21D 2312

Patent

active

044733240

ABSTRACT:
A mine roof support includes a first liquid supply means having a first control valve for connecting a source of liquid under pressure to the legs of the support. The support is also provided with a second control valve which is actuatable, when the pressure of the liquid being supplied to the legs attains a value below the setting pressure for the legs, to connect the legs to a source of liquid under pressure by way of a second liquid supply means. Time-delay means is operable on the second control valve to cause it to close when a predetermined time has elapsed after the pressure in the legs has reached the setting pressure.

REFERENCES:
patent: 4226558 (1980-10-01), Bower et al.
patent: 4264237 (1981-04-01), Irresberger et al.

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