Hydraulic circuit of excavating and slewing working vehicle

Details Hydraulic circuit of excavating and slewing working vehicle Hydraulic circuit of excavating and slewing working vehicle

2005-12-06

2005-12-06

Pezzuto, Robert E (Department: 3671)

Excavating

Scoop or excavating and transporting container

Supported on vehicle between longitudinally spaced ground...

C037S348000

Reexamination Certificate

active

06971195

ABSTRACT:
A hydraulic circuit of a excavating-and-slewing working vehicle, comprising: actuators for a boom, a bucket, slewing and an arm; directional control valves for the respective actuators; a pair of first and second hydraulic pumps for supplying pressure oil to the actuators through the respective directional control valves; a delivery oil passage of the first hydraulic pump tandem-connecting the boom directional control valve for boom to the bucket directional control valve for bucket on the downstream side of the boom directional control valve; a delivery oil passage of the second hydraulic pump tandem-connecting the slewing directional control valve for slewing to the arm directional control valve for arm.

REFERENCES:
patent: 4875337 (1989-10-01), Sugiyama et al.
patent: U 3-44204 (1991-04-01), None
patent: 04-025603 (1992-01-01), None
patent: 06-002352 (1994-01-01), None
patent: U 7-8601 (1995-03-01), None
patent: 10-195933 (1998-07-01), None
patent: 2000-154805 (2000-06-01), None

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