| 摘要 |
PROBLEM TO BE SOLVED: To greatly reduce necessary transportation costs of a freight transportation pallet device by exhibiting a stable anti-vibration function irrespective of a difference in weight or size of loaded cargoes.SOLUTION: An anti-vibration pallet P includes joint means J for making the side faces of a lower frame 11 and an upper frame 12 butt on each other and connecting them on the same plane. According to the size of an air cargo D to be loaded, the joint means adds lower frames and upper frames in units of one each of them to thereby construct a pallet assembly of a corresponding size. Anti-vibration means V includes a nonlinear compression coil spring 35 having nonlinear spring characteristics. A spring constant of the compression coil spring 35 is set so that a unique frequency can be constant even if the loaded weight of the air cargo varies within a predetermined weight range. |
