REDUCED-WEIGHT DEVICE FORMING THE SEAT PORTION FRAME OF A MOTOR VEHICLE SEAT, AND METHOD FOR PRODUCING SAID FRAME WITH DIFFERENT SEAT-PORTION HEIGHTS

摘要

The present invention relates to a device that forms the frame of the seat portion of a seat, such as a motor vehicle seat. The seat portion frame comprises a horizontal portion for supporting a load and two lateral retaining portions which extend substantially perpendicularly to the horizontal support portion, said portions being made from an injection-molded thermoplastic material. According to the invention, the device includes a hollow structure (4) formed by rigidly connected walls defining an upper wall (10) forming the horizontal support portion and two sidewalls (17) extending substantially perpendicularly to the upper wall on each side thereof, so as to form the lateral retaining portions.