Method and apparatus for controlling a mine roof support

Details Method and apparatus for controlling a mine roof support Method and apparatus for controlling a mine roof support

1981-11-12

1984-02-28

Leppink, James A.

Hydraulic and earth engineering

Earth treatment or control

Ground stabilization or reinforcement

405290, 405296, E21D 2316

Patent

active

044339453

ABSTRACT:
In combination with a mine roof support including a sole plate resting on the sole of a mine gallery, a roof shield engaging the roof of the mine gallery, and fluid-operated extensible and collapsible props extending between the sole plate and the roof shield for pressing the latter against the roof, a method for controlling the force at which the roof shield is pressed against the roof of the mine gallery comprising the steps of providing an overpressure valve communicating with the interior of each prop and adjusting the opening pressure of the valve in dependence on the inclination of the props with respect to the sole plate; and an arrangement for carrying out the method.

REFERENCES:
patent: 2644971 (1953-07-01), Rowe
patent: 2846703 (1958-08-01), Adley
patent: 3175238 (1965-03-01), Pennington
patent: 3217608 (1965-11-01), Bolton
patent: 3388413 (1968-06-01), Clarke
patent: 3478522 (1969-11-01), Rieschel
patent: 3664138 (1972-05-01), Cooper
patent: 4236850 (1980-12-01), Koppers
patent: 4247226 (1981-01-01), Weirich
patent: 4264237 (1981-04-01), Irresberger

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