| 摘要 |
The automatic safety seat in a vehicle are designed to minimize the seriousness of car-crash injuries during a frontal collision. When the vehicle collides against other vehicle at a relative velocity of 40 Km/h or up, the backrest is pushed to recline backward by action of springs and various mechanisms designed. A tension spring is one of the most important part used to bring the backrest to a reclining position. Collision results in pulling the upper part of occupants fastened by designed safety-belts to the backrest to recline backwards to the rearmost. Thus, pelvis, chest and head of the occupant are moved away to the farmost and can avoid striking with deforming frontal parts of the intruding car by frontal collision. Chest injuries and brain damage can be avoided.
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