Hydraulic and earth engineering – Earth treatment or control – Ground stabilization or reinforcement
Patent
1979-02-05
1980-09-30
Corbin, David H.
Hydraulic and earth engineering
Earth treatment or control
Ground stabilization or reinforcement
91170MP, E21D 2316
Patent
active
042252717
ABSTRACT:
A control arrangement for a hydraulically operated mine roof support having first and second consumers which require smaller and larger amount of the working medium per time unit, respectively, has first control elements for the first consumers and second control elements for the second consumers. The first control elements include a first bundle of hoses having a small inner diameter and arranged to select and apply pressure to the first consumers directly from a neighboring mine roof support. The second control elements include a second bundle of hoses with a small inner diameter, main control valves indirectly remotely controlled through the second bundle of hoses and arranged to select the second consumers, and conduits extending between the second consumers and the main control valves and arranged to apply pressure to the former. The conduits have an inner diameter which exceeds that of the hoses of the first and second bundles.
REFERENCES:
patent: 3309880 (1967-03-01), Potts et al.
patent: 3821880 (1974-07-01), Weirich et al.
patent: 4158326 (1979-06-01), Krieger
Bochmer Eisennuette Heintzmann GmbH
Corbin David H.
Striker Michael J.
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