Excavating – Ditcher – Condition responsive
Patent
1996-12-26
1999-04-06
Melius, Terry Lee
Excavating
Ditcher
Condition responsive
60421, 60429, E02F 502
Patent
active
058903038
ABSTRACT:
A pilot pressure sensor detects a pilot pressure from an arm operating unit and outputs a pilot pressure signal. A drive signal corresponding to the pilot pressure signal is then outputted from a controller to a solenoid-operated proportional valve. Through the solenoid-operated proportional valve, a pilot pressure is fed to an auxiliary selector valve so that an opening of said auxiliary selector valve becomes greater. Of pressure oil delivered from a first hydraulic pump, a flow rate of the pressure oil to be branched to a side of a by-pass circuit is hence increased. The pressure oil fed through the by-pass circuit passes through a merging directional control valve and is caused to merge with pressure oil fed from a second hydraulic pump. The thus-merged pressure oil is then fed to a hydraulic arm cylinder.
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Hirata Toichi
Ishikawa Kouji
Kowatari Youichi
Sugiyama Genroku
Toyooka Tsukasa
Batson Victor
Hitachi Construction Machinery Co. Ltd.
Melius Terry Lee
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