Rear-seat occupant protection apparatus

A rear-seat occupant protection system for a vehicle, the vehicle comprising:

• a front seat including a seat cushion and a seat back supported by the seat cushion,
• a rear seat disposed behind the front seat,
• a seat belt system including a seat belt, and end of which is fixed to a body of the vehicle and adapted to restrain an occupant seated in the front seat and to permit a frontward displacement of a body of the occupant seated in the front seat in response to a forward inertia of the body of the occupant seated in the front seat;
• wherein said rear-seat occupant protection system comprises:
• a collision detection device adapted to detect a frontal collision of the vehicle, and
• a seat-back displacing mechanism provided at a rear end of the seat cushion of the front seat;
• wherein said seat-back displacing mechanism is operative to fix the seat back to the seat cushion of the front seat in a normal state and to allow the seat back to automatically displace by pivoting frontwardly at said seat-back displacing mechanism with the frontward displacement of the body of the occupant seated in the front seat in response to a frontal impact load applied thereto during a frontal collision of the vehicle when detected by said collision detection device.