Hydraulic circuit system for civil engineering and architectural

Details Hydraulic circuit system for civil engineering and architectural Hydraulic circuit system for civil engineering and architectural

1985-05-28

1986-09-30

Cline, William R.

Material or article handling

Vertically swinging load support

Shovel or fork type

37DIG7, 91530, 180 648, F02F 300

Patent

active

046144757

ABSTRACT:
A hydraulic circuit system for civil engineering and architectural machinery having at least first and second hydraulic pumps, a plurality of actuators driven by hydraulic fluid from said pumps, and a plurality of directional control valves for controlling the direction and flow rate of the hydraulic fluid supplied from the pumps to the actuators. In the directional control valves, a first boom directional control valve and one of right and left travelling directional control valves are connected to the first pump in parallel with each other, a swing directional control valve, an arm directional control valve and a second boom directional control valve are connected to the second pump in parallel with one another, and the other of the right and left travelling directional control valve is connected in tandem to the swing, arm and second boom directional control valves at a location downstream thereof. A connecting line is provided for communication between an inlet port of the one travelling directional control valve and an inlet port of the other travelling directional control valve.

REFERENCES:
patent: 3720059 (1973-03-01), Schurawski et al.
patent: 4112821 (1978-09-01), Bianchetta
patent: 4210061 (1980-07-01), Bianchetta
patent: 4212165 (1980-07-01), Zirps

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