| 摘要 |
PURPOSE: A lower packing structure prevents plastic deformation occurring on the upper and the lower ends of an outer case as the time gap between the central part and the outer part repulsing impact is removed to minimize stress given to the upper and the lower ends of the outer case. CONSTITUTION: Multiple stoppers(61, 62) made of material with hardness larger than that of a lower packing(60) are perpendicularly inserted and fixed to the central part and the outer part of the lower packing(60). The stopper(61) on the central part has upper part inserted into a base stand(55) installed under a driving part(54). The stoppers(62) on both sides are installed lower than the height of the base stand(55). |
