| 摘要 |
<p>PURPOSE:To provide so that the driver's cab and a revolving superstructure can always be maintained horizontally to the plane of an inclined travelling part and that the plane of the upper revolving superstructure can be changed freely regardless of the inclination of the travelling body. CONSTITUTION:Irregular spherical contact parts 12 and 16 are provided between a travelling car body 1 and a revolving superstructure 2, and expansion actuators 3 are provided at intervals of 120 deg.C around between the traveling car body 1 and the revolving superstructure 2, and a switch controller 50 for opening and closing the operation valve of each actuator 3 is provided, and the switch controller 50 is constituted of a switch for opening and closing the solenoid valve belonging to the operation valve of each actuator.</p> |
