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A folding seat comprising a seat cushion having a cushioning member supported by a seat frame and a seat back having a cushioning member supported by a back frame which is pivoted forward with respect to the seat frame so that a seat comprised of the seat cushion and the seat back can be folded. The

A folding seat comprising a seat cushion having a cushioning member supported by a seat frame and a seat back having a cushioning member supported by a back frame which is pivoted forward with respect to the seat frame so that a seat comprised of the seat cushion and the seat back can be folded. The distance between each of the side frames composing the seat frame is arranged to be wider than the distance between each of the side frames composing the back frame. A front end frame of the seat frame is positioned outside an upper end frame of the back frame when the seat frame and the back frame come close together upon folding the seat. Accordingly the thickness of the whole seat can be substantially the same as the seat cushion or the seat back alone, when the seat is folded. Thus, luggage space for baggage in a vehicle can be increased when the seat is folded.

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1. A folding seat comprising:a base plate having side plates and a upper face, said side plates being spaced from each other and arranged to face each other, each side plate having a long hole formed therein, said hole having a substantially arcuate shape; a pair of brackets extending from said uppe

1. A folding seat comprising:a base plate having side plates and a upper face, said side plates being spaced from each other and arranged to face each other, each side plate having a long hole formed therein, said hole having a substantially arcuate shape; a pair of brackets extending from said upper face, said brackets arranged in spaced relationship to one another; a first connection plate and a second connection plate, said first connection plate is pivotably connected to one of said brackets and said second connection plate is pivotably connected to the other one of said pair of brackets; a back frame composed of an upper end frame and a pair of side frames extending from both ends of the upper end frame to support a cushioning member, a lower end of each side frame being connected to a respective one of said connection plates; linkage plates sandwiching each side frame of said back frame, each one of said linkage plates being disposed on an opposite side of each connection plate, and linked to each side frame; a shaft inserted into a lower end portion of said each linkage plate, said shaft adapted to link with each substantially, arcuate shaped long hole of said base plate; a seat frame comprising a front end frame and a pair of side frames extending longitudinally from both ends of the front end frame, said side frames define a long hole and a through-hole, said long hole is positioned toward a vicinity of a rear end of each of said side frames, and said through-hole is positioned between the long hole and the real end of each of said side frames; a shaft member inserted into the through-hole formed in each side frame of said seat frame, and fixed in such a manner that said connection plates are installed pivotably with respect to each side frame; a guide shaft inserted into the through-hole formed in each side frame of said seat frame, and linked to said linkage plate, wherein said seat frame and said back frame are structured and arranged such that a distance between each of the side frames composing said seat frame is wider than a distance between each of the side frames composing said back frame, and the front end frame of the seat frame is positioned outside the upper end frame of the back frame when the seat frame and the back frame come close together upon folding the seat; and wherein said guide shaft is positioned in front in each long hole formed in said seat frame and said shaft is positioned in front in each substantially are shaped long hole formed in said base plate when the seat is in use, and when the seat is folded, the back frame can be folded to be surrounded by said seat frame in such a manner that each connection plate pivots together with the back frame around each of the brackets, the shaft moves backward in each substantially arcuate shaped long hole, and the guide shaft also moves backward in each long hole. 2. The folding seat according to claim 1, wherein the cushioning member supported by said seat frame is adapted to sink when pressed by the back frame upon being folded.3. The folding seat according to claim 2, wherein the cushioning member supported by said seat frame is made of a net member in a three-dimensional structure in which a front mesh layer and a back mesh layer are connected with a large number of piles.4. The folding seat according to claim 1, wherein the cushioning member supported by said seat frame and the cushioning member supported by said back frame are made of a net member in a three-dimensional structure in which a front mesh layer and a back mesh layer are connected with a large number of piles, and have a one-piece structure united integrally with two cushioning members.