Hydraulic valve control apparatus

Details Hydraulic valve control apparatus Hydraulic valve control apparatus

1985-02-05

1987-06-30

Husar, Cornelius J.

Hydraulic and earth engineering

Earth treatment or control

Ground stabilization or reinforcement

405291, 91524, 91527, E21D 2316, E21D 2326

Patent

active

046766987

ABSTRACT:
Valves regulating the supply of hydraulic fluid to hydraulic cylinders of an hydraulic walking mine-roof support are controlled by apparatus comprising an axially-movable switching shaft provided with cams which is rotatable into successive switching stations where it is immobilized by spring-loaded stop pins to that the cams bear on tappets to actuate the respective valves, there being a switching spring acting on the shaft to return the shaft to its initial position of rest after it has been axially displaced and rotated out of that position of rest.

REFERENCES:
patent: 3309880 (1967-03-01), Potts et al.
patent: 3434389 (1969-03-01), Grisebach
patent: 3500719 (1970-03-01), Rieschel
patent: 3906738 (1975-09-01), Weirich et al.
patent: 3967534 (1976-07-01), Cryder et al.
patent: 4394875 (1983-07-01), Weirich et al.
patent: 4572709 (1986-02-01), Weirich et al.

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