Patent ID: 7954899

Claim:
A seat back assembly mounted to a vehicle body, the seat back assembly comprising: a seat cushion mounted to the vehicle body; a frameless seat back having a body formed entirely of expanded polypropylene, the frameless seat back mounted to the seat cushion and spaced apart and free of the vehicle body; a headrest assembly having a headrest body and a leg extending outwardly from the headrest body, and a latching mechanism operable to releasingly engage any one of a plurality of predetermined portions of the leg so as to adjust the height of the headrest assembly with respect to the frameless seat back; and a guide bracket having a plate, the plate having a planar surface and a guide fixedly and rigidly secured to the plate, the guide configured to receive the leg of the headrest assembly, wherein the guide bracket is encapsulated wholly within the expanded polypropylene body of the frameless seat back, the leg creating a moment about the guide when a load is placed on the headrest body, the plate transforming the moment into compression loading of the plate onto the inner surfaces of the expanded polypropylene body of the frameless seat back so to transfer tensile stress along the expanded polypropylene body of the frameless seat back.