Crowell & Moring LLP
Construction machine
A construction machine is characterized by including: a track structure 10; a swing structure 20 provided on the track structure 10 in a swingable manner; swing motors 25, 27 that drive and swing the swing structure; a boom 31 connected to the swing structure 20; a boom cylinder 32 that moves the boom 31 vertically; a swing operation system 72 that instructs a swing operation of the swing structure 20; a boom operation system 78 that instructs a vertical movement of the boom 31; a detector 74d that detects a bottom pressure of the boom cylinder 32; and a controller 80 that reduces swing speed of the swing structure 20 according to a signal from the detector 74d with respect to a reference swing speed according to a signal of the swing operation, while signals of the swing operation and a boom raising operation are being inputted. This ensures that a load acting on the boom can be felt on the basis of motion of a front work implement, and, on the other hand, the front work implement can be operated along a locus according to operation without being affected by the load on the boom.
Hitachi Construction Machinery Co., Ltd.
F F E F F F F E E F E F
F15B F15B E02F F15B F15B F15B F15B E02F E02F F15B E02F F15B
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Shinya Tomoaki Kouji Hidetoshi
Imura Kaneta Ishikawa Satake