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US 4,728,148 AGranted
Supporting structure of the lumbar portion of the foam cushion member in an automotive seat
AssigneeTachi-S Co., Ltd.
InventorTetsuo Saito
Life of this patent
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AssigneeTachi-S Co., Ltd.
InventorTetsuo Saito
Estimating the term…
A structure of a lumbar support portion of a seat back of an automotive seat is disclosed. In a cushion member formed of foam material or in the portion thereof corresponding to the lumbar support portion, there is provided a block member embedded when the cushion member is formed by a mold. The block member comprises an impreganted portion where a foam solution for forming the cushion member is impregnated when the cushion member is foamed and is hardened afterwards, and a soft non-impregnated portion where the cushion member forming foam solution is not impregnated. A body pressure distribution is obtained in which the pressure in the impregnated portion is the greatest and the remaining pressures existing upwardly and downwardly of the greatest pressure are gradually decreased as they recede from the impregnated portion, resulting in the improved tuning of the seat.
A structure of the foam cushion member at the lumbar support portion of an automotive seat comprising a plurality of spring members extending across the right and left sides of a frame said spring members being arranged vertically thereon, and a foam cushion member connecting to said spring members, and further having a foam block member integrally provided in the lumbar support portion of said foam cushion member by means of partially impregnating said foam block member with a foam solution for forming a hard and a soft section therein, said impregnated portion of said foam block member corresponding to said spring member for positioning said foam block member at a set peak line of the body pressure responsive force of said foam cushion member.
Dependencies are inferred from the claim text.