Patent ID: 8465092

Claim:
A seat back framework in a seat back of a vehicle seat, the seat back having a surface facing forwardly of the vehicle seat, on which surface, a back portion of a seat occupant is to rest, comprising: an upper frame member disposed adjacent to an upside of the seat back; a slippage prevention portion for preventing a seat occupant on the vehicle seat from being slipped or dislocated on and along the seat back in a direction upwardly of the seat back, when said back portion of said seat occupant is moved backwardly of the seat back under inertia and pressed against said surface of the seat back in case of a rear-end collision; said slippage prevention portion being defined integrally in said upper frame member so as to protrude towards said surface of the seat back and having a sloped region which is inclined in a direction forwardly and upwardly of said seat back framework, and said slippage prevention portion being so adapted that said sloped region thereof is to receive said back portion of said seat occupant who is to be dislocated in the direction upwardly of the seat back in said case of rear-end collision, thereby preventing upward slippage of said back portion of said seat occupant on and along said surface of said seat back.