Patent ID: 8210607

Claim:
A vehicle seat wherein a seatback frame of a seatback is formed in a hollow square frame shape, a head rest is attached to the seatback frame so as to be movable longitudinally by right and left upper levers, the right and left upper levers are connected to right and left lower lever levers provided in the seatback frame by a connection rod, right and left connection arms of a rear collision detector are attached to the right and left lower levers, respectively, the rear collision detector actuates the right and left upper levers by way of the right and left lower levers and the connection rod when a seat occupant is moved backward by inertia, and thereby moves the headrest forward to protect the head of the occupant, and the right and left connection arms of the rear collision detector are attached to the right and left lower levers, respectively, in a fixed state for maintaining a specified angle, wherein the right and left lower levers are each provided with a first stopper for holding the connection arms at a specified angle, and wherein the right and left connection arms are attached by the connection shaft so as to be positioned nearly in parallel to the sides of the right and left lower levers, and the right and left lower levers beneath a lower side edge of the right and left connection arms comprises a second stopper composing a part of the first stopper, and the right and left lower levers above an upper side edge of the right and left connection arms comprises a third stopper composing a part of the first stopper.