Patent ID: 8469446

Claim:
A seat back framework in a seat back of a vehicle seat, wherein said seat back includes an upper side and two lateral sides, comprising: an upper frame member disposed in an upper side of said seat back; a first lateral frame member disposed in one of said two lateral sides of said seat back, said first lateral frame member including a flat upper region defined therein; a second lateral frame member disposed in another of said two lateral sides of said seat back, said second lateral frame member including a flat upper region defined therein; a first shoulder receiving portion defined in said flat upper region of said first lateral frame member so as to project therefrom in a direction forwardly of the seat back framework; a second shoulder receiving portion defined in said flat upper region of said second lateral frame member so as to project therefrom in a direction forwardly of the seat back framework; said first and second shoulder receiving portions being adapted for receiving two shoulder portions of a seat occupant on the vehicle seat, respectively, when a back portion of said seat occupant is displaced backwardly and upwardly under inertia to and along said seat back in case of rear-end collision, thereby preventing said back portion of said seat occupant against further backward and upward displacement prior to said back portion being moved close to said upper frame member.