Abstract: A seat back frame of a vehicle seat is formed out of a sheet iron blank into a pressed piece of sheet iron. The seat back frame is provided with a main region and with a border oriented transversely to the main region. The border is composed of merging portions, and has a top border, a left and a right bent corner border and a left and a right lateral border. A left and a right stiffening bead is provided and located in an upper end region of the corresponding lateral border and in a portion of the main region a) that is directly adjacent the upper end region and that is b) in the neighborhood of the corresponding corner border.

Abstract: The seat back frame of a vehicle seat has been formed out of a sheet iron blank into a pressed piece of sheet iron. The seat back frame is provided with a main region and with a border oriented transversely to said main region. The border being composed of merging portions, viz., of a top border, a left and a right bent corner border and a left and a right lateral border. A left and a right stiffening bead is provided, each of which being located both in an upper end region of the corresponding lateral border and in a portion of the main region a) that is directly adjacent said upper end region and that is b) in the neighborhood of the corresponding corner border.

Abstract: A frame of a backrest or a seat made of metal for a motor vehicle seat can be produced from magnesium in a single operation. The frame employs a design which uses a Z-shaped profile as its basic geometry and is produced as a magnesium die casting.