Patent ID: 7963599

Claim:
A vehicle seat comprising: a seat back frame having right and left side frames; a headrest forwardly movably mounted to the seat back frame; a rear-end collision detector mounted to the seat back frame through a link member, wherein the rear-end collision detector detects rearward movement of the seat occupant and moves rearward; and the rear-end collision detector is operatively connected to the headrest such that the rearward movement of the rear-end collision detector forwardly moves the headrest to support a head of a seat occupant; a respective support shaft mounted to each side frame, each shaft having a central axis point that does not move relative to the respective side frame; wherein the link member is mounted to the support shaft and connected to an end portion of the rear-end collision detector; and a biasing member that biases the link member, wherein an end of the biasing member is engaged with an end portion of the link member that protrudes in a direction away from the support shaft; wherein: each side frame is provided with a front projecting wall inwardly projecting and integrally formed at a front end of the respective side frame, and a rear projecting wall inwardly projecting and integrally formed at a rear end of the respective side frame; and an other end of the biasing member is engaged with either of the front or rear projecting wall that is closer to the end portion of the link member than the other.