Seat assembly with foam encapsulated load-supporting fibrous matrix

In a vehicle seat assembly for carrying downwardly directed seating loads, a main frame having laterally separated side rails and a front rail, a load supporting fabric sheet having side edges fixed to said side rails and having front and rear edges which are not directly coupled to said main frame, said fabric sheet formed of elastic woven filaments and being normally maintained in a tensioned condition by said side rails, said sheet being supported in a generally horizontal position on said side rails so that at least some of said filaments extend side-to-side in said seat assembly between said side rails and are coupled at both their ends to said side rails, said sheet being able to transfer seating loads to said side rails, a foam body molded in place on said frame so as to substantially encapsulate said rails and said sheet, said sheet being substantially encapsulated in said body in a position forming a support for a portion of said body which constitutes the seat cushion and carries the downwardly directed seating loads, said foam body acting to hold said filaments in fixed relative positons in which said filaments and said foam body cooperate in providing a response to the seating loads.