| 摘要 |
PROBLEM TO BE SOLVED: To provide a damping coil spring and a vibration-proof pallet capable of exerting stable vibration-proofing performance regardless of difference in weights and sizes of loaded freight and remarkably reducing a cost required for transportation.SOLUTION: A vibration-proof pallet P includes joint means J for connecting a lower frame 11 and an upper frame 12 on the same plane while butting their side faces, and a pallet assembly of a corresponding size is assembled by connecting units respectively composed one lower frame and one upper frame, by the joint means according to a size of loaded air freight D. Vibration-proofing means V has a nonlinear compression coil spring 35 having a nonlinear spring characteristic, and a viscoelastic sheet 40 fixed to an outer periphery thereof, and a spring constant of the compression coil spring is determined so that a constant natural vibration frequency is kept even when a loading weight of the air freight is deviated within a prescribed weight range. |
