Arrangement for emergency operation of hydraulic appliance in an

Details Arrangement for emergency operation of hydraulic appliance in an Arrangement for emergency operation of hydraulic appliance in an

1990-09-28

1991-10-29

Michalsky, Gerald A.

Motors: expansible chamber type

Plural relatively movable or rigidly interconnected working...

With means to control the working fluid to one working...

91427, 91529, 13759616, 137884, 405302, F15B 1307

Patent

active

050605569

ABSTRACT:
An electro-hydraulic control system for a mineral mining installation has a series of valve blocks, each contain a number of valves which are operated in dependence on electrical signals to cause hydraulic appliances of roof supports to operate. To allow emergency operation, when there is a power failure or when the control system fails or is otherwise inoperative, further manually operable valves are connected by a flexible, multi-core connecting cable to the valve block of the associated support. The emergency control valves can operate hydraulically controllable direction control valves of the control system and by-pass the electrical controls. The support can then be controlled purely hydraulically, at least in its main functions, using the emergency device.

REFERENCES:
patent: 4159671 (1977-07-01), Allen
patent: 4327628 (1982-05-01), Weirich et al.
patent: 4702148 (1987-10-01), Kussel et al.

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