Damper system for transportation of a container
A damper system for transportation includes a packaging box for storing a container containing a work and also includes a pair of an upper damper and a lower damper each placed between the packaging box and the container. The upper and lower dampers contain foamed polyethylene or polypropylene, the upper damper includes upper impact-absorbing sections, and the lower damper includes lower impact-absorbing sections. The sum of h 2 and h 1 is equal to the width of an upper or lower space between the packaging box and the container, and h 1 is greater than h 2 , wherein h 2 represents the height of the upper impact-absorbing sections and h 1 represents the height of the lower impact-absorbing sections. The shape of the upper and lower impact-absorbing sections is rectangular parallelepiped shape.
1. A damper system, for transportation of a container, comprising:
a packaging box storing a container containing work products in a vertical state to be protected from damage upon impact;
a lower damper, located in a lower space between lower surfaces of the packaging box and container, the lower damper having a lower body portion and lower impact-absorbing leg sections, wherein the lower body portion has upper and lower surfaces and four side surfaces defining four corners of the lower body portion and wherein the lower impact-absorbing leg sections are respectively located at the four corners of the lower body portion and extend a distance h 1 from the lower surface of the lower body portion toward the lower surface of the packaging box; and
an upper damper, located in an upper space between upper surfaces of the packaging box and container, the upper damper having an upper body portion and upper impact-absorbing leg sections, wherein the upper body portion has upper and lower surfaces and four side surfaces defining four corners of the upper body portion and
wherein the upper impact-absorbing leg sections are respectively located at the four corners of the upper body portion and extend a distance h 2 from the upper surface of the upper body portion toward the upper surface of the packaging box; and
wherein h 1 is greater than h 2 and the lower damper has an opening, which penetrates through the lower damper, for distributing impact, applied from the outside, to the lower impact-absorbing leg sections, the opening being centered relative to the lower damper,
the upper damper has an opening, which penetrates through the upper damper, for distributing impact, applied from the outside, to the upper impact-absorbing leg sections, the opening being centered relative to the upper damper, and
the area of the opening centered relative to the upper damper is larger than the area of the opening centered relative to the lower damper.
2. The damper system according to claim 1 , wherein the height h 1 of the impact-absorbing leg sections of the lower damper system is within a range of 4 to 5 cm and the height h 2 of impact-absorbing leg sections of the upper damper system is within a range of 0.5 to 1.5 cm.
3. The damper system according to claim 1 , wherein the lower impact-absorbing leg sections of the lower damper system have a rectangular parallelepiped shape.
4. The damper system according to claim 1 , wherein the upper and lower surfaces of the packaging box have a surface area Sa, wherein the lower impact-absorbing leg sections contact the lower surface of the packaging box or the upper impact-absorbing leg sections contact the upper surface of the packaging box over a total area of contact Sb, and wherein Sb is 3%-5% Sa.
5. The damper system according to claim 1 wherein the opening has a cross-section defined by four interior side walls respectively parallel to the four side surfaces of the lower damper, and
wherein a dimension of the rectangle, extending between two of the interior side walls opposing each other, is greater than the distance on the lower surface of the lower damper between two of the leg sections on the lower damper.
6. The damper system according to claim 1 wherein the opening has a cross-section defined by four interior side walls respectively parallel to the four side surfaces of the upper damper, and
wherein a dimension of the rectangle, extending between two of the interior side walls opposing each other, is greater than the distance on the upper surface of the lower damper between two of the leg sections on the upper damper.
7. The damper system according to claim 1 wherein the area of the opening centered relative to the upper damper is set to 2.5 to 3.5 times as much as the area of the opening centered relative to the lower damper.