Crowell & Moring LLP
Safety device for hydraulic working machine
There are provided: control valves 22-24 that control flow of pressure oil from the hydraulic source 21 to the hydraulic actuators 15-17; electric lever devices 51-53 that output electrical operation signals, which are drive instructions for the hydraulic actuators 15-17, in correspondence to lever operation; and a control unit 25-30 and 50 that controls the control valves 22-24 in correspondence to the operation signals. When the determination unit determines that an operation signal is not within the normal range, the hydraulic actuators 15-17 are allowed to be driven with flow of pressure oil to the hydraulic actuators 15-17 limited more significantly than in a case where it is decided that an operation signal is within the normal range.
Hitachi Construction Machinery Co., Ltd.
F F F F E E E F F F F F F E F E
F15B F15B F15B F15B E02F E02F E02F F15B F15B F15B F15B F15B F15B E02F F15B E02F
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Hidetoshi Yuuki Katsuaki Kazuhiro Yuuji
Satake Gotou Kodaka Ichimura Nagashima