Patent ID: 8579370
Filing Date: 2013-11-12
Classification: B60N

Abstract:
1. A structure of a seat back of a vehicle seat in combination with a headrest unmovable forwardly and backwardly of the seat back, comprising: a seat back frame having: an upper frame member on which said headrest is mounted; a pair of lateral frame members; and a lower cross frame member; an elastic seat back padding; a resilient support element resiliently supported in said seat back frame, said resent support element being adapted to resiliently support said elastic seat back padding as well as a back portion of a seat occupant to be seated on the vehicle seat, said resilient support element having an upper end portion; a biasing element having: wherein, in case of rear-end collision, upon receiving an excessive great load applied via said seat back padding from said seat occupant who is pressed backwardly under inertia against the seat back, said resilient support element is forcibly displaced far backwardly from said normal support position, together with said back portion of said seat occupant, which overcomes said biasing force of said biasing element, thereby causing said biasing element to resiliently stretch to permit said upper end portion of said resilient support element to be displaced backwardly and upwardly, via said movable connecting element, with respect to said seat back frame, so that a head of said seat occupant is brought to a point close to said headrest, thereby reducing said certain distance between said head and said headrest, prior to said head of said seat occupant being, directly pressed against said headrest.