| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a seismic support of traveling crane which prevents a rocking phenomenon where legs are lifted when a large earthquake occurs and minimizes damage. <P>SOLUTION: A boom 7 is rotated upward around a pivot point O so as to be erected by hoisting a rope by means of a boom derricking drum during suspension. A gravity center shifting unit 12 is provided to shift a position of the center of gravity of the travelling crane 1 to an intermediate portion of the legs 5 arranged apart from each other in a travelling direction and in a perpendicular direction. The gravity center shifting unit 12 cancels out a fluctuation of the position of the center of gravity of the travelling crane 1, the fluctuation being caused when the boom 7 is erected during suspension. <P>COPYRIGHT: (C)2013,JPO&INPIT |
