Actuator for a mine roof support unit

Details Actuator for a mine roof support unit Actuator for a mine roof support unit

1981-03-24

1983-07-26

Walton, George L.

Fluid handling

Systems

With selective motion for plural valve actuator

74 181, 91170MP, 91522, 251258, F16K 3152

Patent

active

043948758

ABSTRACT:
A hydraulic control system for a mine roof support unit has a control valve assembly for controlling the hydraulic appliances of the unit, and an actuator for actuating the control valve assembly. The actuator has a valve block provided with a plurality of pairs of spool valves. The spool valves of each pair are detachably fixed in a pair of generally parallel bores formed in the valve block. Each pair of spool valves is provided with a respective rocker arm for actuating purposes. Each of the rocker arms is mounted on a respective cover plate, which covers the mouths of the corresponding pair of bores, and which is detachably secured to the valve block.

REFERENCES:
patent: 2317065 (1943-04-01), Kaelin
patent: 2766772 (1956-10-01), Welty et al.
patent: 3384121 (1968-05-01), Spencer
patent: 3490495 (1978-01-01), Green
patent: 3557828 (1971-01-01), Smith
patent: 3599675 (1971-08-01), Sievenpiper
patent: 4327628 (1982-05-01), Weirich et al.

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