Hydraulic control systems for mining apparatus

Motors: expansible chamber type – Fluid supply through diverse paths to single expansible chamber – Second path activated in response to pressure or flow in...

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91518, 251 31, F15B 1304

Patent

active

043911811

ABSTRACT:
A hydraulic control system, particularly for controlling the operation of roof support props of a mine working, employs control devices operated manually to feed pressure fluid to the working chambers of the props to effect extension or retraction thereof. A two-state valve device is operated when the props are extended to ensure that the correct setting pressure is established. This valve device has a control piston which is actuated to cause the device to establish independent connection between the main fluid pressure line and the associated working chambers of the props charged with fluid by the initial operation of the control devices. The connection established by the valve device is maintained even if the control devices break connection between the chambers and the pressure line. When the correct setting pressure is reached, a further control piston of the valve device is actuated to break the connection established by the valve device ready for the next operative cycle.

REFERENCES:
patent: 3635020 (1972-01-01), Mahlmann
patent: 3638531 (1972-02-01), Rieschel
patent: 3776098 (1973-12-01), Behrens
patent: 3814375 (1974-06-01), Grottoh
patent: 4276810 (1981-07-01), Zeuner

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