Hydraulic shovel control circuit with operating pattern switchin

Details Hydraulic shovel control circuit with operating pattern switchin Hydraulic shovel control circuit with operating pattern switchin

1989-08-29

1991-01-22

Kwon, John T.

Motors: expansible chamber type

Plural relatively movable or rigidly interconnected working...

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

91522, 137270, 13759615, F15B 1308

Patent

active

049861654

ABSTRACT:
An operating apparatus for a hydraulic shovel for operating a plurality of control valves which control the operation of work devices includes pilot type control valves, pilot valves, levers for operating pilot valves, and an operating pattern switching valve. The operating pattern switching valve has a rotary spool inserted into a casing. A plurality of input ports are provided in a peripheral surface of the casing with phases deviated from each other axially and peripherally. A plurality of output ports are provided oppositely to the input ports.

REFERENCES:
patent: 3817153 (1972-09-01), Zunzer
patent: 4738103 (1988-04-01), Tha

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