Hydraulic roof support control system

Details Hydraulic roof support control system Hydraulic roof support control system

1980-06-24

1982-05-04

Hershkovitz, Abraham

Motors: expansible chamber type

Plural relatively movable or rigidly interconnected working...

Separate valve means actuatable by a common nonmanual...

91527, 91529, 91530, 405302, F15B 1116

Patent

active

043276288

ABSTRACT:
A hydraulic control system is provided for a mine roof support assembly constituted by a plurality of roof support units positioned side-by-side. The control system comprises a respective control valve assembly having a plurality of similar control valves each of which controls a respective hydraulic appliance associated with the corresponding roof support unit. Each control valve can be actuated optionally by an actuator mounted on either one of the two adjacent roof support units, or by either one of two actuating devices mounted one on each of said two adjacent roof support units. Each control valve includes two servo valves having a pair of first and second axially aligned servo-pistons which are separate and independently operable with respect to each other.

REFERENCES:
patent: 3589241 (1971-06-01), Bolton
patent: 3805674 (1974-04-01), Sebesta
patent: 3889481 (1975-06-01), Weirich
patent: 3906738 (1975-09-01), Weirich
patent: 3958493 (1976-05-01), Fujita
patent: 4072011 (1978-02-01), Ewald
patent: 4114376 (1978-09-01), Cattaneo
patent: 4159671 (1979-07-01), Allen

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