Shin Caterpillar Mitsubishi Ltd.

Yorimichi Kubota

Nobuaki Matoba

Shinya Nozaki

Yoshiyuki Hibi

Katsuo Nagao

Yoshio Hamada

Kazuo Takahashi

Yoshikazu Kurokawa

Masanori Hayashi

A hydraulic circuit for a working machine is provided which prevents a decrease in the working speed of a clamshell bucket upon expansion of an expansion arm, so that improvement of the operability can be achieved. A hydraulic circuit for a working machine is configured such that a clamshell bucket is attached to a tip end of an expansion arm and the expansion arm and the clamshell bucket are operated by pressure oil supplied from a common pressure source. The operating pressure is reduced for driving the expansion arm to the expansion side based on the operating pressure for opening the clamshell bucket. By the configuration, the clamshell bucket can be opened rapidly, and improvement of the operability is achieved.

Hydraulic circuit of working machine

Device for controlling a working arm of a working machine

A carrier vehicle having a swing table supported on an under-carriage so as to swing a full turn, and a planetary reduction gear for reducing the revolution of a drive motor and transmitting it to the swing table. The planetary reduction gear is mounted on the under-carriage under the swing table.

Carrier vehicle equipped with a swing table

Growing community of inventors

Tokyo, Japan

Yorimichi Kubota