Abstract: A vehicle seat includes a seatback. The seatback includes a main frame and a sub-frame suspended from the main frame. The sub-frame is configured to swivel with respect to the main frame. The sub-frame includes a first lateral member, a second lateral member separated from the first lateral member by a distance, and a reinforcement member coupling the first lateral member with the second lateral member.

Abstract: A seatback of a vehicle seat includes a seatback frame and a backrest attached to the seatback frame. The backrest includes a first supporting area configured to receive a load of a shoulder of the occupant, and a second supporting area configured to receive a load of a spine area of the occupant. Support stiffness in the first supporting area for a vertical load is lower than that in the second supporting area. Support stiffness in the second supporting area for a shearing load is higher than that in the first supporting area.

Abstract: A vehicle seat in which a swiveling motion of a sub-frame is restricted only to a desirable direction is provided. A sub-frame is suspended from a seatback frame. A first elastic member connects a right upper end of the sub-frame to the seat back frame, and a second elastic member a left upper end of the sub-frame to the seat back frame. A universal joint mechanism connects a lower lateral portion of the sub-frame to a lateral member of the seat back frame.

Abstract: A vehicle seat in which a thickness of a seatback is reduced is provided. A supporting mechanism comprises a pivot shaft, a hub member, and a reinforcement shaft. A front end of a seat base frame is connected to a lower frame through a first joint in a pivotal manner. One end of a pivot shaft is connected to a rear end of the seat base frame in a pivotal manner, and other end of the pivot shaft is connected to a hub through a second joint in a pivotal manner. The pivot shaft and the reinforcement shaft are overlapped in a width direction of the vehicle at least partially.

Abstract: A vehicle seat in which a swiveling motion of a sub-frame is restricted only to a desirable direction is provided. A sub-frame is suspended from a seatback frame. A first elastic member connects a right upper end of the sub-frame to the seat back frame, and a second elastic member a left upper end of the sub-frame to the seat back frame. A universal joint mechanism connects a lower lateral portion of the sub-frame to a lateral member of the seat back frame.

Abstract: A vehicle seat in which a thickness of a seatback is reduced is provided. A supporting mechanism comprises a pivot shaft, a hub member, and a reinforcement shaft. A front end of a seat base frame is connected to a lower frame through a first joint in a pivotal manner. One end of a pivot shaft is connected to a rear end of the seat base frame in a pivotal manner, and other end of the pivot shaft is connected to a hub through a second joint in a pivotal manner. The pivot shaft and the reinforcement shaft are overlapped in a width direction of the vehicle at least partially.

Abstract: A vehicle seat includes a seatback. The seatback includes a main frame and a sub-frame suspended from the main frame. The sub-frame is configured to swivel with respect to the main frame. The sub-frame includes a first lateral member, a second lateral member separated from the first lateral member by a distance, and a reinforcement member coupling the first lateral member with the second lateral member.

Abstract: A seatback of a vehicle seat includes a seatback frame and a backrest attached to the seatback frame. The backrest includes a first supporting area configured to receive a load of a shoulder of the occupant, and a second supporting area configured to receive a load of a spine area of the occupant. Support stiffness in the first supporting area for a vertical load is lower than that in the second supporting area. Support stiffness in the second supporting area for a shearing load is higher than that in the first supporting area.