Hydraulic control apparatus

Details Hydraulic control apparatus Hydraulic control apparatus

1996-05-24

1998-09-29

Lopez, F. Daniel

Motors: expansible chamber type

Plural relatively movable or rigidly interconnected working...

Condition responsive means for modifying working member...

91517, 60422, F15B 11042

Patent

active

058133127

ABSTRACT:
A hydraulic control apparatus having two groups and formed by combination of actuator circuits on large flow rate side (a boom cylinder circuit and an arm cylinder circuit) and actuator circuits on small flow rate side (a bucket cylinder circuit and a rotating motor circuit), for independent supply of hydraulic fluid. In these groups, a bucket preferential valve and a rotating preferential valve form bucket cylinder preferential and rotating motor preferential circuit constitutions.

REFERENCES:
patent: 3032994 (1962-05-01), Lindell
patent: 3971216 (1976-07-01), Miller
patent: 4024710 (1977-05-01), Zelle
patent: 4161256 (1979-07-01), Seaberg
patent: 4345436 (1982-08-01), Johnson
patent: 4473090 (1984-09-01), Uehara et al.
patent: 4508013 (1985-04-01), Barbagli
patent: 4977928 (1990-12-01), Smith et al.
patent: 5083428 (1992-01-01), Kubomoto et al.
Patent Abstracts of Japan, vol. 12, No. 454, (M-769), Nov. 29, 1988, JP-63-181822, Jul. 27,1988.

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