Nhk Spring Co., Ltd.

Toshihiko Yamaguchi

Takashi Takeshita

Hideaki Kidokoro

Mutsumi Tabata

Tuyoshi Mutou

In a vehicular seataccording to this invention, since a back shellcovers a back frame, as in the case where the shape of a seat back is formed of the urethane pad, the shape of the seat back is not easily changed. Thus, the passenger can be surely held. Further, since the back shellis displaceably supported for the back frame, the back shellis displaced according to the figure or posture of the passenger. This permits the passenger to sit with good riding comfort.

Vehicular seat

A flat spring of a vehicular seat is elastically supported by means of supporting springs that extend in accordance with the load of an occupant. The seat has displacement sensors, first-stage determination step, second-stage determination step, and third-stage determination step. The displacement sensors output electrical signals corresponding to the respective elongations of the springs. The first-stage determination step determines the occupant in the seat in accordance with voltage values delivered from the displacement sensors. The second-stage determination step determines whether or not the result of determination by the first-stage determination step is maintained for a given period of time. The third-stage determination step compares the result of determination by the second-stage determination step with the preceding result of determination and specifies the occupant in accordance with the result of the comparison.

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Yokohama, Japan

Toshihiko Yamaguchi