Abstract: A method of manufacturing a cushion material by applying high frequency welding to a sandwich consisting of a core layer of foamed material, a surface material layer and a backing material layer, in which a fine powdery welding material is previously injected or impregnated in desired weld areas of the foamed material layer. The method comprises floating the fine powdery welding material in the form of a cloud, and blowing up the fine powdery welding material floating in cloud-like form to impregnate the desired areas of the foamed material layer with the fine powdery welding material.

Abstract: A seat adjuster in which a seat frame supporting a seat body is provided with a pair of flanges extending inwardly from the opposite side walls thereof, and a channel of suitable sectional shape is formed on each of these flanges to slidably receive therein a bar of complementary sectional shape supported on the floor surface of a vehicle so that the seat frame can make sliding movement along the bars. This seat adjuster can be mounted without requiring any substantial space between the seat frame and the floor surface.