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

2005-07-12

2005-07-12

Petravick, Meredith C. (Department: 3671)

Excavating

Scoop or excavating and transporting container

Supported on vehicle between longitudinally spaced ground...

C037S902000

Reexamination Certificate

active

06915600

ABSTRACT:
A hydraulic circuit of an excavating and slewing working vehicle of two pump system, wherein a directional control valve for slewing and a directional control valve for arm are tandem-connected to the upstream side and downstream side of the delivery oil passage of a second hydraulic pump, respectively, a directional control valve for bucket are connected to the delivery oil passage of a first hydraulic pump, and then a bleed switching valve connected, through a check valve between the directional control valve for slewing and the directional control valve for arm and switched to connect to or disconnect from a tank on the upstream side of the check valve and the directional control valve for slewing are operated interlockingly with each other.

REFERENCES:
patent: 4875337 (1989-10-01), Sugiyama et al.
patent: 2760702 (1998-03-01), None
patent: 2767482 (1998-04-01), None
patent: 10-195933 (1998-07-01), None
patent: 2000-154805 (2000-06-01), None

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