JP3589744B2 - Automotive seat back and its foaming mold - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to an automobile seat back and a foam molding die thereof.
[0002]
[Prior art]
2. Description of the Related Art A seat back of an automobile is often formed by molding in which a foaming material is injected into a foaming mold and foamed. Further, as the seat back, a bag-like portion that opens downward on the upper back side is formed, and after foam molding of the seat back, the bag-like portion has an upper portion of a seat frame for improving cushioning properties and attaching to a car. Some types are stored.
[0003]
The seat back having the bag-shaped portion is difficult to remove from the foaming mold due to the presence of the bag-shaped portion, and the structure of the foaming mold is likely to be complicated. Therefore, in order to eliminate such inconveniences, a seat back 80 as shown in FIG. 14 and FIG. 15 showing its 15-15 section has been proposed. The seat back 80 is a sub cushion that forms an upper storage space 82 of a seat frame (not shown) between the main cushion pad 81 that is in contact with the occupant's back and the upper back surface of the main cushion pad 81. And a cushion pad 83.
[0004]
As shown in FIG. 16 and FIG. 17 showing a cross section taken along line 17-17, the cushion pads 81 and 83 are adhered to the back surfaces 85 and 86 of upper edges 82 and 84 which are upper edges when a seat back is used. It is molded by a series of flexible sheet materials 87 such as cold gauze with the upper edges 82 and 84 connected. Then, the flexible sheet material 87 is bent between the upper edge portions 82 and 84 of the two cushion pads 81 and 83 after the mold is released, and the back surfaces are overlapped. At this time, since the upper edges of the cushion pads 81 and 83 are connected by the flexible sheet material 87, there is no possibility that the overlapping position is out of order.
[0005]
The molding of the seat back is performed using a foaming mold 90 as shown in FIG. The inside of the foam molding die 90 is partitioned into a main cushion pad molding space 93 and a sub cushion pad molding space 64 by a partition 92 provided upright on a lower mold surface 91. The upper mold surface 95 has a mold surface corresponding to the partition 92 and a flexible sheet material arrangement surface 96 that is substantially in contact with the upper end surface of the partition 92 on both sides thereof. The flexible sheet material arrangement surface 96 and the upper end surface of the partition 92 are in contact with each other via the member 87.
[0006]
Then, a flexible sheet material 87 is arranged on the flexible sheet material arrangement surface 96, and the foamed material injected into both the cushion pad forming spaces 93, 94 is foamed, so that the upper edge portion is formed of the flexible sheet material. The main cushion pad 81 and the sub cushion pad 83 connected by the material 87 are formed in the mold. Thereafter, the mold is opened, and the main cushion pad and the sub cushion pad are released. At this time, both cushion pads in the mold are in a state of being arranged side by side in a horizontal direction, and since the connection is made by the flexible sheet material, the relative movement of both cushion pads can be performed at the connection portion, so that the demolding is prevented. Never be.
[0007]
[Problems to be solved by the invention]
However, in order to maintain the strength of the partition 92, it is necessary that the thickness f of the partition is not less than a predetermined value. In addition, in the case of an aluminum casting mold, the upper end surface of the partition 92 is required for mold manufacturing. Cannot be reduced to a pointed shape, and the thickness f needs to be 5 mm or more. Therefore, the main cushion pad 81 and the sub cushion pad 83 are connected by the flexible sheet material 87 in a state where the upper edges 82 and 84 are separated by a distance corresponding to the thickness f of the partition 92. As a result, when the flexible sheet material 87 is bent between the upper edge portions 82 and 84 of the both cushion pads 81 and 83 and the two cushion pads 81 and 83 are overlapped, a slack 88 occurs in the flexible sheet material 87, The slack protrudes from the upper surface 89 of the upper edge of the seat back, and when the seat back is covered with a skin (not shown), there is a problem that the skin is raised and the aesthetic appearance of the seat back is impaired.
[0008]
Accordingly, it is an object of the present invention to provide a seat back and a foam molding die thereof that are less likely to cause deterioration in aesthetic appearance due to looseness of a flexible sheet material connecting an upper edge portion of a main cushion pad and a sub cushion pad.
[0009]
[Means for Solving the Problems]
The inventions proposed here include two inventions relating to a seat back and two inventions relating to a foaming mold.
The first invention and the second invention relating to the seat back are characterized in that a main cushion pad and a sub cushion pad in which upper edges are separated from each other by a predetermined distance are formed by a series of flexible sheet materials adhered to the upper edge rear surface. The connection is made at the upper edge portion, and the flexible sheet material is bent between the upper edge portions so that the back surfaces of both cushion pads are overlapped with each other, and has the following features.
[0010]
That is, the first invention relates to a seat back is in the upper portion rear surface of both the cushion pad, wherein the flexible sheet material is stuck, stepped-shaped portion or the recessed toward the upper edge the upper surface to the cushion pad outer surface An approaching shape portion formed of a slope approaching the outer surface of the cushion pad is formed, and in the gap between the step-like portion or the approaching shape portion formed on the upper surface of the upper edge portion of both cushion pads by overlapping the two cushion pads, The flexible sheet material is stretched.
[0011]
On the other hand, a second invention relating to a seat back is characterized in that one end side of the flexible sheet material is adhered to the back surface of an upper edge portion of one of the main cushion pad and the sub cushion pad, and the other cushion pad The other end of the flexible sheet material is adhered from the back surface of the upper edge to the middle of the upper surface of the upper edge, and the flexible sheet material is folded back on the upper surface of the upper edge of the cushion pad. It is characterized.
[0012]
On the other hand, the first invention and the second invention relating to the foaming mold comprise a lower mold and an upper mold, and the lower mold surface has a main cushion pad molding space and an auxiliary space between the upper mold surface. A partition for partitioning into a cushion pad forming space is provided upright, and the upper die surface includes a main cushion pad formed in the main cushion pad forming space and a sub cushion pad formed in the sub cushion pad forming space. A flexible sheet material arranging surface for arranging a flexible sheet material to be connected at the time of the foam molding is provided for a foam molding die for a seat back of an automobile, which is provided in a portion opposed to the partition and in the vicinity thereof. And has the following features.
[0013]
That is, in the first invention relating to the foaming mold, the flexible sheet material disposing surface protrudes toward the lower mold surface at a portion opposed to the upper end surface of the partition and at both side portions thereof, and contacts the upper end surface of the partition. It is characterized in that it has a convex surface that touches or substantially abuts.
[0014]
On the other hand, in the second invention relating to the foaming mold, the flexible sheet material arrangement surface is bent toward the lower mold surface side at a position substantially corresponding to one side surface of the partition, and substantially equal to the upper end surface of the partition. It is characterized by a stepped shape which is bent again along the upper end surface of the partition at the same position.
[0015]
【Example】
Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a perspective view showing an embodiment of the first invention relating to a seat back, FIG. 2 is a sectional view taken along line 2-2 of FIG. 1, and FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. 3, FIG. 5 is a cross-sectional view showing a foaming mold used for molding the seat back of the embodiment, and FIG. 6 is a perspective view of a seat back of another embodiment. FIG. 7 and FIG. 7 are perspective views showing a main cushion pad and a sub cushion pad in the same embodiment before overlapping, and FIG. 8 is a partial sectional view showing a seat back of still another embodiment.
[0016]
9 is a perspective view showing an embodiment of the second invention relating to the seat back, FIG. 10 is a cross-sectional view taken along line 10-10 of FIG. 9, and FIG. 11 is a superposition of a main cushion pad and a sub cushion pad in the embodiment. FIG. 12 is a perspective view showing the front, FIG. 12 is a sectional view taken along line 12-12 of FIG. 11, and FIG. 13 is a sectional view showing a foaming mold used for molding the seat back of the embodiment.
[0017]
The seat back 10 shown in FIGS. 1 and 2 includes a main cushion pad 11 and a sub cushion pad 21 superimposed on the upper back surface thereof, and a seat frame between the back surfaces 12 and 22 of the cushion pads 11 and 21 is provided. It has an upper storage space 13.
[0018]
The main cushion pad 11 forms a main part of the seat back in contact with the occupant's back, and has a concave surface 14 on the back surface 12 in which a frame of the seat frame is arranged.
On the other hand, the sub cushion pad 21 is for forming the seat frame upper storage space 13 between the sub cushion pad 21 and the upper back surface of the main cushion pad 11, and is constituted by a cushion pad smaller than the main cushion pad 11. As shown in FIG. 3, the back surface 22 is a surface 23 that is concavely concave except for both sides and the upper part. The concave recessed surface 23 is for storing a spring or the like stretched on the seat frame between the back surface of the main cushion pad 11 and the type of the seat frame or the shape of the back surface of the main cushion pad 11. It may not be provided for some reasons.
[0019]
The main cushion pad 11 and the sub-cushion pad 21 are connected by a flexible sheet material 31 made of a cold gauze, a nonwoven fabric or a woven fabric, or a plastic sheet at upper edges 15, 25 which are upper edges when a seat back is used. Have been. The upper edges 15, 25 of the cushion pads are opposed to each other by the superposition, as shown in FIG. 26 are formed with step-shaped portions 19 and 29 that are recessed toward the outer surfaces 18 and 28 toward the upper edge upper surfaces 17 and 27.
[0020]
As shown in FIGS. 1 and 2, the stepped portions 19 and 29 form a gap 20 between the upper edges of the cushion pads 11 and 21 by overlapping the cushion pads 11 and 21. The interval a of the gap 20 is equal to the sum of the front and rear heights a ₁ and a ₂ of the step-shaped portions 19 and 29.
[0021]
Both ends of the flexible sheet material 31 are adhered to the step-shaped portions 19 and 29 with a predetermined distance b between the upper edges 15 and 25 of the cushion pads 11 and 21. The attachment extends to the boundary between the inner surfaces 16, 26 and the upper surfaces 17, 27 at the upper edges 15, 25 of both cushion pads. The distance b between the upper edge portions 15 and 25 is generated by the thickness of the partition in the foaming mold as described later, and is usually about 5 mm or more. Further, the distance b between the upper edges, that is, the length b of the flexible sheet material 31 between the upper edges 15 and 25 before the two cushion pads 11 and 21 overlap, and the front and rear of the step-shaped portions 19 and 29. The relationship between the heights a ₁ and a ₂ is set so that a ₁ + a ₂ = a ≧ b.
[0022]
The cushion pads 11 and 21 connected by the upper edges 15 and 25 are formed by bending the flexible sheet material 31 between the upper edges 15 and 25 as shown by a chain line in FIG. Are overlapped. As a result, a gap 20 is formed between the upper edges 15 and 25 of both cushion pads by the stepped portions 19 and 29, and the flexible sheet material 31 is stretched between the gaps 20. At this time, the interval a (= a ₁ + a ₂ ) of the gap 20 and the length b of the flexible sheet material between the upper edge portions 15 and 25 of the cushion pads before overlapping are in a relationship of a ≧ b. Therefore, the flexible sheet material 31 is stretched in the gap 20 without slack. As a result, the flexible sheet material 31 does not loosen on the upper surface of the upper edge portion of the seat back 10, and when the outer skin is thereafter covered with the seat back 10, bulging due to the looseness of the flexible sheet material 31 occurs. And the appearance is not impaired.
[0023]
In the case of a> b, the length of the flexible sheet material 31 is insufficient with respect to the interval of the gap 20, but even in this case, both the cushion pads 11 and 21 are overlapped by the gap 20 at the time of the overlapping. Since the space between the gaps 20 is reduced due to elastic deformation due to the tension of the flexible sheet material 31, the two cushion pads 11 and 21 can be overlapped. Further, when the flexible sheet material 31 is made of a material which can be stretched to some extent, the stretch is added, so that the cushion pads 11 and 21 can be overlapped.
[0024]
The flexible sheet material 31 is provided at a portion where the boundary between the upper edge inner surfaces 16, 26 and the upper surfaces 17, 27 of both cushion pads 11, 21 is straight, so that the slack is completely eliminated. Although it is preferable to provide the curved portion of the boundary line, even if a part of the cushion pad may be loosened, the slack can be pushed into the gap 20 and the upper surface of both cushion pads 11 and 21 can be provided. Since the protrusion can be prevented, the beauty of the seat back is not impaired.
[0025]
FIG. 5 shows a foaming mold 100 used for molding the seat back 10. The foam mold 100 includes a lower mold 111 and an upper mold 121, and has a cushion pad molding space 131 between a lower mold surface 112 and an upper mold surface 122. On the lower mold surface 112, a partition 113 that divides the molding space 131 into a main cushion pad molding space 132 and a sub cushion pad molding space 133 is provided upright. The thickness B of the partition 113 is usually 5 mm or more from the viewpoint of the strength of the portion and the production of the mold.
[0026]
The upper die surface 121 is provided with a flexible sheet material arranging surface 123 for arranging the flexible sheet material 31 at and near a portion facing the partition 113. The flexible sheet material arrangement surface 123 has a portion facing the partition 113 and both sides thereof protrude toward the lower mold surface 112 side, and when the mold is closed, the upper end surface of the partition 113 and the flexible sheet material 31 intervene. The convex surface 124 is in contact. The convex surface 124 is for forming the stepped portions 19 and 29 of the main cushion pad 11 and the sub cushion pad 21, and the protrusion dimensions A ₁ and A ₂ measured on both sides of the partition 113 are determined by the thickness of the partition 113. For B, A ₁ + A ₂ ≧ B. In addition, pins or the like (not shown) for holding the flexible sheet material 31 are appropriately provided on the flexible sheet material arrangement surface 123. Reference numeral 125 denotes a convex portion for forming a concave groove for accommodating the frame of the seat frame on the back surface of the cushion body.
[0027]
In molding the seat back using the foaming mold 100, the flexible sheet material 31 is arranged on the flexible sheet material arrangement surface 123 of the upper mold surface 122, and then the mold is closed to form the flexible sheet. The upper end surface of the partition 113 is brought into contact with the convex surface 124 of the flexible sheet material arrangement surface via the material 31, and the foaming material injected into the mold before closing the mold or the material injection port (not shown) is placed in the upper mold. In the case where it is provided in 121, the foaming raw material injected after closing the mold is foamed in the main cushion pad forming space 132 and the sub cushion pad forming space 133. At the time of the foaming, the flexible sheet material 31 is connected to both cushion pads on both sides of the partition 113 by bonding both ends to the back surfaces of the cushion pads. After that, if both cushion pads are removed, the seat back 10 in which the main cushion pad 11 and the sub cushion pad 21 are connected as shown in FIG. 3 is obtained. At the time of removing the mold, the cushion pads are present in the mold in a state of being horizontally aligned with each other, and since there is no bag-shaped portion between the pads that hinders the mold removal, the mold can be easily removed. it can.
[0028]
FIG. 6 is a perspective view of a seat back 40 of another embodiment, and FIG. 7 is a perspective view showing a main cushion pad 41 and a sub cushion pad 42 constituting the seat back 40 before they are overlapped. In the seat back 40 of this embodiment, as shown in FIG. 7, step-shaped portions 43 and 44 are formed in a part of the upper edges of both cushion pads with a width equal to the width of the flexible sheet material 31.
[0029]
Therefore, as shown in FIG. 6, the gap 45 formed by the stepped portions 43 and 44 on the upper surface of the seat back 40 due to the overlapping of the cushion pads 41 and 42 is closed by the flexible sheet material 31. And the feel of the upper surface of the seat back 40 is improved. Further, since there is no gap portion that is not closed by the flexible sheet material 31, there is a possibility that the skin (not shown) covering the seat back 40 may be depressed by the gap portion that is not closed. And the aesthetic appearance is further improved. Other portions of the seat back 40 have the same shape as that shown in FIGS.
[0030]
Note that a foaming mold for molding the seat back 40 is not shown again because it is only necessary to provide the convex surface 124 shown in FIG. 5 in accordance with the lateral width of the stepped portions 43 and 44.
[0031]
Also, instead of the stepped portions 19, 29, 43, and 44 of the cushion pads, as in a seat back 50 shown in FIG. 8, from the rear surfaces to the upper surfaces of the upper edges 53, 54 of the cushion pads 51, 52, the approach shaped portions 57 and 58 made of slopes approaching the cushion pad outer surface 55, 56 may be provided to tension the flexible sheet material 31 into the gap 59 between the approaching shape portions 57 and 58. The foam molding die (not shown) for the seat back 50 only needs to be provided with the convex surface 124 shown in FIG. 5 in conformity with the shape of the approach portions 57 and 58 of the cushion pads.
[0032]
Next, examples of the second invention relating to the seat back and the second invention of the foaming mold will be described. 9 is a perspective view of the seat back of the embodiment, FIG. 10 is a cross-sectional view of the seat back 10-10, FIG. 11 is a perspective view of the cushion pad before overlapping, and FIG. 12 is a cross-sectional view of FIG. It is.
[0033]
The seat back 60 shown in those figures has a flexible structure in which both ends are adhered to the back surfaces of the upper edges 62, 72 of the main cushion pad 61 and the sub cushion pad 71 to connect the upper edges 62, 72 of both cushion pads. The flexible sheet material 31 is stuck on one end side of the upper surface 63 of the upper edge portion of the main cushion pad 61.
[0034]
Then, as shown in FIG. 12, the flexible sheet material 31a existing between the upper edges 62, 72 of both cushion pads is folded back on the upper edge upper surface 63 of the main cushion pad 61 and overlapped. As shown, both cushion pads 61 and 62 are overlapped. Therefore, the flexible sheet material 31 a existing between the upper edge portions 62 and 72 of the cushion pads is used for folding on the upper edge portion upper surface 63 of the main cushion pad 61 and is stretched without slack. In order to stretch the flexible sheet material 31 without loosening, the length d of the flexible sheet material 31a between the upper edge portions 62 and 72 of the cushion pads 61 and 71 before the two cushion pads 61 and 71 are overlapped. It is preferable that c ≧ d with respect to the sticking length c of the flexible sheet material on the upper surface 63 of the upper edge of the main cushion pad.
[0035]
On the upper surface of the seatback 60, a step having a thickness twice as large as the thickness of the flexible sheet material 31 occurs due to the folding of the flexible sheet material 31. However, since the thickness of the flexible sheet material 31 itself is small, it hardly affects the appearance of the seat back after the skin is covered. Reference numerals 64 and 74 denote the back surfaces of the upper edges of both cushion pads, and reference numeral 65 denotes an accommodation space above the seat frame.
In this embodiment, the flexible sheet material 31 is adhered to the upper surface of the upper edge of the main cushion pad 61. Alternatively, the flexible sheet material 31 may be adhered to the upper surface of the upper edge of the sub cushion pad 71.
[0036]
FIG. 13 is a sectional view of a foaming mold 200 used for molding the seat back 60. The foaming mold 200 includes a lower mold 211 and an upper mold 221, and has a molding space 231 between the lower mold surface 212 and the upper mold surface 222. In the lower mold surface 212, a partition 213 that divides the molding space 231 into a main cushion pad molding space 232 and a sub cushion pad molding space 233 is provided upright. The thickness D of the partition 213 is usually 5 mm or more from the viewpoint of the strength of the portion and the production.
[0037]
The upper die surface 222 is provided with a flexible sheet material arranging surface 223 for arranging the flexible sheet material 31 at and near a portion facing the partition 213. The flexible sheet placement surface 223 is bent toward the lower mold surface 212 at a position 224 corresponding to one side surface of the partition 213, in this embodiment, a side surface 214 on the side of the main cushion pad molding space 232, and the partition 213 is bent. At the position 215 substantially coincident with the upper end surface of the partition 213, and extends toward the auxiliary cushion pad forming space 233 side. The vertical dimension C of the flexible sheet material arrangement surface 223 along the side surface 214 of the partition 213 on the side of the main cushion pad forming space is such that C ≧ D with respect to the thickness D of the partition 213. It is preferable that the flexible sheet material 31 is not loosened when the sheets 61 and 71 are overlapped. Reference numeral 226 denotes a protrusion for forming a groove in which the frame of the seat frame is arranged on the back surface of the cushion pad.
[0038]
【The invention's effect】
As shown and described above, according to the seat back of the present invention, the flexible sheet material connecting the main cushion pad and the sub cushion pad at the upper edge portion is loosened on the upper surface of the seat back and swells outward. And the appearance of the seat back is not impaired.
Further, according to the foaming mold of the present invention, a seatback whose appearance is not impaired at the connecting portion between the main cushion pad and the sub cushion pad can be easily obtained without hindering the removal of both cushion pads. .
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of a first invention relating to a seat back.
FIG. 2 is a sectional view taken along line 2-2 of FIG.
FIG. 3 is a perspective view showing a state before a main cushion pad and a sub cushion pad are overlaid in the embodiment.
FIG. 4 is a sectional view taken along line 4-4 of FIG. 3;
FIG. 5 is a sectional view showing a foaming mold used for molding the seat back of the embodiment.
FIG. 6 is a perspective view of a seat back according to another embodiment.
FIG. 7 is a perspective view showing a state before a main cushion pad and a sub cushion pad are overlaid in the embodiment.
FIG. 8 is a partial sectional view showing a seat back of still another embodiment.
FIG. 9 is a perspective view showing an embodiment of the second invention relating to the seat back.
FIG. 10 is a sectional view taken along line 10-10 of FIG. 9;
FIG. 11 is a perspective view showing a state before a main cushion pad and a sub cushion pad are overlaid in the embodiment.
FIG. 12 is a sectional view taken along line 12-12 of FIG. 11;
FIG. 13 is a cross-sectional view showing a foaming mold used for molding the seat back of the example.
FIG. 14 is a perspective view of a conventional seat back.
FIG. 15 is a sectional view taken along line 15-15 of FIG.
FIG. 16 is a perspective view showing the main cushion pad and the sub cushion pad of the seat back before overlapping.
FIG. 17 is a sectional view taken along line 17-17 of FIG. 16;
FIG. 18 is a cross-sectional view of a conventional foaming mold for a seat back.
[Explanation of symbols]
11, 41, 51, 61: Main cushion body 15, 25, 53, 54, 62, 72: Upper edge portion 16, 26: Upper edge portion back surface 17, 27, 63: Upper edge upper surface 19, 29: Step shape Parts 20, 45, 59: gap 31: flexible sheet material 57, 58: approaching shape parts 111, 211: lower molds 121, 221: upper mold 112, 212: lower mold surface 122, 222: upper mold surface 113, 213: partitions 123, 223: flexible sheet material arrangement surface 124: convex surface

Claims (8)

The main cushion pad and the sub-cushion pad whose upper edges are separated from each other by a predetermined distance are connected at the upper edge by a series of flexible sheet materials attached to the back surface of the upper edge. In an automobile seat back in which the flexible sheet material is bent and the back surfaces of both cushion pads are overlapped,
A stepped portion that is depressed toward the outer surface of the cushion pad toward the upper surface of the upper edge portion, or an approaching shape that is formed by a slope approaching the outer surface of the cushion pad, on the back surface of the upper edge portion of both cushion pads to which the flexible sheet material is attached A portion is formed, and the flexible sheet material is stretched in a gap between the step-shaped portion or the close-shaped portion formed on the upper surface of the upper edge portion of the two cushion pads by overlapping the two cushion pads. An automobile seat back characterized by: 2. The gap between a stepped portion or an approaching portion of a superposed main cushion pad and a sub cushion pad and a gap between an upper edge portion of the main cushion pad and a sub cushion pad upper edge before the superposition. An automobile seat back, wherein the relationship of the length b of the flexible sheet material is a ≧ b. The main cushion pad and the sub-cushion pad whose upper edges are separated from each other by a predetermined distance are connected at the upper edge by a series of flexible sheet materials attached to the back surface of the upper edge. In an automobile seat back in which the flexible sheet material is bent and the back surfaces of both cushion pads are overlapped,
One end of the flexible sheet material is adhered to the back surface of the upper edge of one of the cushion pads of the main cushion pad or the sub cushion pad, and the other cushion pad is attached to the upper surface of the upper edge from the back surface of the upper edge. A seat back of the vehicle, wherein the other end side of the flexible sheet material is stuck halfway, and the flexible sheet material is folded back on the upper surface of the upper edge of the cushion pad. 4. The flexible sheet material according to claim 3, wherein the length c of the flexible sheet material on the upper surface of the upper portion of the cushion pad is different from the length of the flexible sheet material between the upper edge portion of the main cushion pad and the upper edge portion of the sub cushion pad. An automobile seat back, wherein the relationship of the length d is c ≧ d. The lower mold surface includes a lower mold surface and an upper mold surface, and a partition is provided on the lower mold surface to partition the upper mold surface into a main cushion pad molding space and a sub cushion pad molding space. A flexible sheet material for connecting a main cushion pad formed in the main cushion pad forming space and a sub cushion pad formed in the sub cushion pad forming space at the time of the foam molding is provided on the surface. In the foaming mold for a seat back of an automobile, the flexible sheet material arrangement surface is provided in a portion opposed to the partition and in the vicinity thereof,
The flexible sheet material arranging surface is a convex surface that projects toward the lower mold surface side at a portion facing the upper end surface of the partition and at both side portions thereof and abuts or substantially abuts on the upper end surface of the partition. Characteristic foam molding die for automobile seat back. 6. The method according to claim 5, wherein the relationship between the projections A ₁ and A ₂ of the convex surfaces of the flexible sheet material arrangement surfaces on both sides of the partition and the thickness B of the partition is A ₁ + A ₂ ≧ B. Mold for seat back of automobile. The lower mold surface includes a lower mold surface and an upper mold surface, and a partition is provided on the lower mold surface to partition the upper mold surface into a main cushion pad molding space and a sub cushion pad molding space. A flexible sheet material for connecting a main cushion pad formed in the main cushion pad forming space and a sub cushion pad formed in the sub cushion pad forming space at the time of the foam molding is provided on the surface. In the foam molding die of the seat back of the automobile, the flexible sheet material arrangement surface is provided in a portion facing the partition and in the vicinity thereof,
The flexible sheet material arrangement surface is bent toward the lower mold surface at a position substantially corresponding to one side surface of the partition, and is bent again substantially along the upper end surface of the partition at a position substantially equal to the upper end surface of the partition. A foaming mold for a seat back of an automobile, characterized by having a stepped shape. 8. The foam molding die for an automobile seat back according to claim 7, wherein a vertical dimension C of a flexible sheet material arranging surface along one side surface of the partition is C ≧ D with respect to a thickness D of the partition. .

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