Front loading hydraulic excavator

Details Front loading hydraulic excavator Front loading hydraulic excavator

1980-05-29

1982-10-19

Stoner, Jr., Bruce H.

Material or article handling

Vertically swinging load support

Shovel or fork type

91512, 91517, E02F 386

Patent

active

043547974

ABSTRACT:
An excavator including a boom pivotally moved by boom cylinders, an arm pivotally moved by an arm cylinder and a bucket pivotally moved by bucket cylinders further includes a boom detecting device detecting a pivotal displacement of the boom and producing a first pilot pressure substantially proportional to the pivotal displacement of the boom and a bucket detecting device detecting a pivotal displacement of the bucket and producing a second pilot pressure substantially proportional to the pivotal displacement of the bucket. The first pilot pressure is supplied via a first conduit to a first valve switching pilot pressure port of a control valve device, and the second pilot pressure is supplied via a second conduit to a second valve switching pilot pressure port of the control valve device. The control valve device is connected to the bucket cylinders in such a manner that a piston side of the bucket cylinders can be drained.

REFERENCES:
patent: 3563137 (1971-02-01), Graber et al.
patent: 3862697 (1975-01-01), Gill et al.
patent: 3905500 (1975-09-01), Bourges
patent: 3987920 (1976-10-01), Parquet et al.

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