| 摘要 |
PROBLEM TO BE SOLVED: To provide a movable crane, capable of reducing weight when vehicle travels, in spite of recent trend of being enlarged in size. SOLUTION: The movable crane is provided with a car body, a rotating platform rotatably installed on the car body, an extensible boom, comprising a plurality of boom stages engaged and inserted to each other, pivotally supported on the rotating platform by a boom hoisting cylinder to be capable of rising and falling, and extending, a boom side support 6 installed on a tip side surface of a top boom 5a at the tip stage of the extensible boom, and the auxiliary jib 7 installed on the boom side support 6. The boom side support 6 and the auxiliary jib 7 are rotatably connected to each other by a connecting pin 8. When the auxiliary jib 7 is used, it is extended on the front side of the top boom 5a. When it is stored, it is rotated around the connecting pin 8 to be stored on the side surface side of the top boom 5. When it is not used, connection by the connecting pin is released, and the auxiliary jib 7 is removed from the boom side support 6, thereby total weight of the vehicle is reduced. COPYRIGHT: (C)2009,JPO&INPIT |
