Motors: expansible chamber type – With motive fluid valve – Both inlet and exhaust controlled by motive fluid pressure...
Reexamination Certificate
2005-04-12
2005-04-12
Lopez, F. Daniel (Department: 3745)
Motors: expansible chamber type
With motive fluid valve
Both inlet and exhaust controlled by motive fluid pressure...
C091S437000
Reexamination Certificate
active
06877417
ABSTRACT:
To perform boom-down operation by operating a boom cylinder (6) by an external load (W) while simultaneously operating an arm cylinder (26) or a bucket cylinder (27) in the state the bucket is off the ground, a first boom directional control valve (2) and a regeneration boom valve (13) are controlled to the neutral position and the open position respectively so that the hydraulic oil is regenerated from a line (9) located at the oil-returning side of the boom cylinder (6) through the regeneration boom valve (13) to a line (5) located at the oil-feeding side. Therefore, the volume of the hydraulic oil that can be supplied from the pressurized oil source (4) to the arm cylinder (26) or the bucket cylinder (27) via the second arm directional control valve (24) or the bucket directional control valve (25) is increased by the amount equivalent to the amount of the oil that is not supplied from the pressurized oil source (4) to the boom cylinder (6). As the circuit according to the invention enables the arm cylinder (26) or the bucket cylinder (27) to work faster, it increases the operating efficiency of the hydraulic excavator when its hydraulic actuators are operated simultaneously.
REFERENCES:
patent: 5415076 (1995-05-01), Krone et al.
patent: 45-36432 (1970-11-01), None
patent: 55-49116 (1980-03-01), None
patent: 2-54902 (1990-04-01), None
patent: 09-132927 (1997-05-01), None
Darby & Darby
Lopez F. Daniel
Shin Caterpillar Mitsubishi Ltd.
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