Patent ID: 8313140

Claim:
A vehicle seat for supporting a head of a vehicle seat occupant, comprising: a headrest; a backrest; a backrest frame; a lower link mechanism rotatably attached to the backrest frame; an upper link mechanism that attaches the headrest to the backrest frame so that the headrest is movable in a backward and forward motion relative to the backrest frame; a rear end collision sensor located in the backrest and positioned behind the vehicle seat occupant, the collision sensor being: linked via the upper link mechanism to move the headrest forward when the rear end collision sensor moves backwards by a connecting rod that joins the upper link mechanism to the lower link mechanism via rotation of the lower link mechanism; formed by one flat cushion plate of a substantially square shape positioned behind a portion from an upper part to a lower part of a back of the seat; and movably mounted to be movable in a backward and forward direction by way of an upper and a lower parallel seat spring; wherein a coupling part of a right end and a coupling part of a left end of one of the upper or lower parallel seat springs are directly connected to the lower link mechanism and an other of the upper or lower parallel seat springs are directly connected to the backrest frame.