| 摘要 |
A seat structure capable of reducing the fatigue of a seated person by the seating thereof for a long time. In a seat (10) for a vehicle, the rear end of the lower layer seat (50) of a cushion material (20) having a front end fixed to the front end of a frame (14) for seat section is elastically connected to the rear end of the frame (14) for the seat section through a movable frame (34) and an elastic torsion bar (46). The cushion material (20) has such a spring zero characteristic that the spring constant of the portion thereof supporting the projected part of the seated person is smaller than the spring constant of the other portions thereof. The seat (10) for the vehicle is formed so as to reduce vibration energy transmitted to the backbone part of the seated person through the frame (14) for the seat section and so that its peripheral parts can change the energy to vibration equivalent to the fluctuation of a living body and the vibration can be transmitted to the seated person through the frame (14) for the seat section. The alpha wave of 10 to 12 Hz produced in a calm awaked state is produced in the brain of the seated person. The vibration in a resonance frequency band is transmitted to the seated person after its amplitude is attenuated.
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