Vehicular seat and vehicular seat manufacturing method

Abstract

To provide a vehicular seat that allows a pocket with a large capacity to be formed on a rear surface of the seat without impairing appearance of the vehicular seat.SOLUTION: A vehicular seat S includes a pocket 30 on a rear surface of a seatback 1. The pocket 30 includes a pocket forming sheet 31 superposed on an outer surface of a back surface side skin material 20a positioned on the rear surface of the seatback 1 and a pocket seaming part 34. The pocket seaming part 34 includes right and left first and second seaming parts formed at a position sandwiching an opening 30a in a sheet width direction, right and left third seaming parts forming right and left outer edge parts of the pocket 30, and a fourth seaming part forming a lower edge part of the pocket 30 for forming an opening 30a of the pocket in the upper end part of the pocket forming sheet 31. The right and left second seaming parts are arranged inside the right and left third seaming parts in the sheet width direction.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a vehicle seat and a method for manufacturing a vehicle seat, and more particularly to a vehicle seat provided with a pocket on the rear surface of the seat back and a method for manufacturing a vehicle seat. [Background technology]

[0002] Conventionally, vehicle seats have been known that include a seat back that is constructed by placing a cushioning material on a back frame that serves as a skeleton and covering the cushioning material with a cover material. Some vehicle seats have a bag-shaped pocket that is attached by stitching to the outer surface of the back cover material located at the rear of the seat back and that can store small items (see, for example, Patent Documents 1 and 2).

[0003] The vehicle seat described in Patent Document 1 has a pocket attached by stitching to the rear surface of the seat back. The pocket is formed to be large enough to reach both left and right ends of the seat back in the seat width direction, and the opening of the pocket is also formed long enough to reach both left and right ends of the seat back. The vehicle seat described in Patent Document 2 also has a pocket attached by stitching to the rear surface of the seat back. The pocket is located in the center of the seat back in the seat width direction and is slightly narrower than the seat back. The opening of the pocket also has a length corresponding to the size of the pocket. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 10-327978 [Patent Document 2] Japanese Patent Application Laid-Open No. 2010-105485 Summary of the Invention [Problem to be solved by the invention]

[0005] Incidentally, in the case of a pocket shape for a vehicle seat such as that in Patent Document 1, although it is possible to achieve a relatively large capacity, the opening of the pocket extends to both the left and right ends of the seat back, which makes it difficult to close the opening and also makes the vehicle seat look unattractive, potentially compromising its design. Furthermore, in the case of a pocket shape for a vehicle seat such as that described in Patent Document 2, the opening of the pocket is a length that corresponds to the size of the pocket, and although this does not detract from the appearance of the vehicle seat, the capacity of the pocket is reduced, which may result in poor functionality. Therefore, when forming a pocket on the rear surface of a vehicle seat, there has been a demand for a technology that can maximize the capacity of the pocket without impairing the appearance of the vehicle seat.

[0006] Furthermore, when forming a pocket on the rear surface of a vehicle seat, a technique that allows the pocket to be formed in a relatively simple manner has been desired.

[0007] The present invention has been made in consideration of the above-mentioned problems, and an object of the present invention is to provide a vehicle seat and a method for manufacturing a vehicle seat that, when forming a pocket on the rear surface of the vehicle seat, can ensure the capacity of the pocket without compromising the appearance of the vehicle seat. Another object of the present invention is to provide a vehicle seat and a method for manufacturing a vehicle seat that allows for the simple formation of a pocket on the rear surface of the vehicle seat. [Means for solving the problem]

[0008] The above-mentioned problem is solved by the vehicle seat of the present invention, which provides a vehicle seat having a pocket on the rear surface of the seat back, wherein the seat back has a cover material that serves as a covering material for the seat back, and the pocket has a sheet-like pocket forming member that is overlaid on the outer surface of the back surface side cover material located on the rear surface of the seat back, and a pocket seam for attaching the pocket forming member to the back surface side cover material in an overlaid state, and the pocket seam is provided at the upper end of the pocket forming member to form an opening of the pocket, and is formed at a position that sandwiches the opening in the seat width direction, and each extends in the seat width direction. This problem is solved by having left and right first seams, left and right second seams formed at positions sandwiching the opening in the seat width direction, connected to the left and right first seams respectively, and extending in a direction intersecting the left and right first seams, left and right third seams formed at both ends of the pocket forming member in the seat width direction, respectively, and extending in the up and down direction to form the left and right outer edges of the pocket, and a fourth seam formed at the lower end of the pocket forming member and extending in the seat width direction to form the lower edge of the pocket, and the left and right second seams are positioned more inward than the left and right third seams in the seat width direction.

[0009] With the above configuration, it is possible to realize a vehicle seat that can ensure the capacity of the pocket without impairing the appearance of the vehicle seat. Specifically, the pocket seams are provided at the upper end of the pocket-forming member to form a pocket opening, and include left and right first seams formed at positions sandwiching the opening in the seat width direction and extending in the seat width direction, and left and right second seams formed at positions sandwiching the opening in the seat width direction, connected to the left and right first seams, respectively, and extending in a direction intersecting the left and right first seams. In other words, the pocket opening is formed in the center of the seat back in the seat width direction and is not long enough to reach both left and right ends of the seat back. Therefore, the shape of the opening does not detract from the appearance of the vehicle seat. The left and right second seams that sandwich the pocket opening are positioned more inward in the seat width direction than the left and right third seams that form the left and right outer edges of the pocket, so that the pocket opening is narrow and the pocket storage area is wide. Therefore, with this shape of the opening, it is possible to ensure (increase) the capacity of the pocket.

[0010] In this case, the left and right first seams and the left and right second seams are preferably formed on the overlapped portion when the surface of the pocket forming member is partially overlapped on the outer surface of the back side skin material, and the left and right third seams and the fourth seam are preferably formed on the folded portion when the portion other than the overlapped portion is folded back via a fold provided in the pocket forming member. With the above-described configuration, when forming a pocket on the rear surface of a vehicle seat, the stitching lines can be made as inconspicuous as possible, ensuring aesthetic appeal. In addition, the pocket can be manufactured using a relatively simple manufacturing method.

[0011] In this case, the pocket has a plate-shaped member attached to a position of the pocket forming member corresponding to the opening and extending in the seat width direction along the opening, and the plate member is preferably positioned between the left and right second seam portions in the seat width direction and at a position that does not intersect with the left and right second seam portions. With the above-described configuration, the strength of the opening of the pocket and the area around the opening can be increased, and the functionality of the pocket can be improved. Furthermore, the presence of the plate member makes it easier to form the pocket.

[0012] In this case, the pocket has a plate seam for attaching the plate member to the pocket forming member, and the plate seam extends in the seat width direction along the extension direction of the plate member and intersects with the left and right second seam portions. With the above configuration, the stitching strength around the opening of the pocket can be increased, that is, the stitching strength of the first stitched portion and the second stitched portion can be increased.

[0013] In this case, it is preferable that the left and right second seam portions extend in a direction substantially perpendicular to the left and right first direction portions, respectively. With the above configuration, when an occupant uses a pocket (when putting their hand in the pocket), interference with the second seam can be minimized.

[0014] In this case, the second stitching portion preferably has a first extension portion extending in a direction intersecting with the first stitching portion, and a second extension portion connected to the first extension portion and extending from the first extension portion toward the outside in the seat width direction in a direction intersecting with the first extension portion. The second extending portion of the second sewn portion may extend in a direction inclined with respect to the first sewn portion. Preferably, the second extending portion of the second seam extends outward in the seat width direction so as to move away from the first seam. With the above-described configuration, the stitching strength of the opening of the pocket and the periphery of the opening (both left and right ends of the opening) can be further increased. Furthermore, with the above configuration, when an occupant puts a small item in the pocket or takes a small item out of the pocket, interference with the second seam can be avoided.

[0015] The object of the present invention is to provide a method for manufacturing a vehicle seat having a pocket on the rear surface of a seat back, the method including a step of manufacturing the pocket, wherein the step of manufacturing the pocket includes overlapping a sheet-like pocket forming member on the outer surface of a back surface side skin material that is disposed on the rear surface of the seat back among skin materials that serve as covering materials for the seat back, and attaching the pocket forming member to the back surface side skin material in an overlapped state by a pocket stitching portion, and when attaching the pocket forming member, left and right sides extending in the seat width direction are provided at the upper end of the pocket forming member to form an opening of the pocket, and are formed at positions that sandwich the opening in the seat width direction.

[0013] The aforementioned problem is also solved by a method for manufacturing a vehicle seat, characterized in that the pocket forming member is attached using: a right first seam; left and right second seams that are formed at positions on either side of the opening in the seat width direction, that are connected to the left and right first seams, respectively, and that extend in a direction intersecting the left and right first seams; left and right third seams that are formed at both ends of the pocket forming member in the seat width direction, respectively, and that extend in the vertical direction so as to position the left and right second seams on the inside in the seat width direction in order to form the left and right outer edges of the pocket; and a fourth seam that is formed at a lower end of the pocket forming member and extends in the seat width direction in order to form the lower edge of the pocket.

[0016] In this case, when attaching the pocket forming member, it is preferable to overlap a portion of the surface of the pocket forming member onto the outer surface of the back-side skin material, and then attach the overlapped portion using the left and right first seams and the left and right second seams, and then fold back the portion other than the overlapped portion via a fold provided in the pocket forming member, and then further attach the folded-back portion using the left and right third seams and the fourth seam. [Effects of the Invention]

[0017] According to the present invention, it is possible to realize a vehicle seat that can ensure the capacity of the pocket without impairing the appearance of the vehicle seat. Specifically, the opening of the pocket is formed in the center of the seat back in the seat width direction, and is not long enough to reach both ends of the seat back. Therefore, the shape of the opening does not detract from the appearance of the vehicle seat. In addition, the pocket is configured so that the opening is narrow and the storage section of the pocket is wide, so that the shape of the opening makes it possible to ensure (increase) the capacity of the pocket. Furthermore, according to the present invention, the stitching lines can be made as inconspicuous as possible, ensuring aesthetic appeal. Furthermore, the pocket can be manufactured using a relatively simple manufacturing method. Furthermore, according to the present invention, the strength of the opening of the pocket and the periphery of the opening can be increased, thereby improving the functionality of the pocket. Also, the pocket can be easily formed. Furthermore, according to the present invention, the suture strength around the opening of the pocket can be increased. Furthermore, according to the present invention, when an occupant uses a pocket (when putting their hand in the pocket), interference with the second seam can be avoided. Furthermore, according to the present invention, the stitching strength of the pocket opening and the periphery of the opening (both left and right ends of the opening) can be further increased, and interference with the second stitching can be prevented when an occupant puts or takes out small items in the pocket. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is an external perspective view of a vehicle seat according to an embodiment of the present invention; [Figure 2] FIG. 2 is a perspective view of the vehicle seat as viewed from the rear side. [Figure 3A] FIG. 10 is a view showing a state in which a plate member is sewn to a pocket forming member. [Figure 3B] 3B is a view showing the state in which the pocket forming member of FIG. 3A is superimposed on the back surface skin material and sewn together. FIG. [Figure 3C] 3C is a diagram showing a state in which the pocket forming member in FIG. 3B is folded back. FIG. [Figure 3D] FIG. 3D is a diagram showing a state in which the pocket forming member has been sutured from the state shown in FIG. 3C. [Figure 4A] FIG. 10 is a view showing a state in which a plate member is sewn to a pocket forming member of the second embodiment. [Figure 4B] 4B is a view showing the state in which the pocket forming member of FIG. 4A is superimposed on the back surface skin material and sewn together. FIG. [Figure 4C] 4C is a diagram showing a state in which the pocket forming member in FIG. 4B is folded back. FIG. [Figure 4D] FIG. 4D is a diagram showing a state in which the pocket forming member has been sutured from the state shown in FIG. 4C. [Figure 5] FIG. 2 is a top view showing the seat heaters (center heater and side heater). [Figure 6A] FIG. 6 is a cross-sectional view of the seat heater taken along line VI-VI. [Figure 6B] FIG. 6 is a cross-sectional view of the seat heater of the first modified example taken along the line VI-VI. [Figure 7] FIG. 10 is a top view of the central heater, showing that the central heater can be partially folded back. DETAILED DESCRIPTION OF THE INVENTION

[0019] Hereinafter, an embodiment of the present invention will be described with reference to FIGS. This embodiment relates to an invention of a vehicle seat having a pocket on the rear surface of the seat back, the pocket having a sheet-like pocket forming member that is overlaid on the outer surface of a back surface covering material that is located on the rear surface of the seat back, and a pocket seam, the pocket seam is provided at the upper end of the pocket forming member to form an opening of the pocket, and has left and right first seams that are formed at positions that sandwich the opening in the seat width direction, left and right second seams that are also formed at positions that sandwich the opening and extend in a direction that intersects with the left and right first seams, left and right third seams that form the left and right outer edges of the pocket, and a fourth seam that forms the lower edge of the pocket, and the left and right second seams are positioned inward of the left and right third seams. The side of the seat back of a vehicle seat on which an occupant sits is the front side of the seat.

[0020] As shown in FIG. 1, the vehicle seat S of this embodiment is a vehicle seat, and is mainly composed of a seat body having a seat back 1, a seat cushion 2, and a headrest 3, a pocket 30 attached to the rear surface of the seat back 1, and a sheet-shaped seat heater 40 attached inside the seat body.

[0021] As shown in Figures 1 and 2, the seat back 1 is a backrest portion that supports the back of a seated person from behind, and is configured by placing a cushion material 10 on a back frame (not shown) that serves as the skeleton, and covering it with a skin material 20. The seat back 1 is composed of a central portion 1A located in the center of the seat width direction, and left and right side portions 1B (side bolster portions) located on the outer sides of the central portion 1A in the seat width direction. On the surface of the cushion material 10, left and right skin hanging grooves 10a are formed which extend in the vertical direction so as to separate the central portion 1A from the left and right side portions 1B. A bag-shaped pocket 30 capable of storing small items is attached to the rear surface of the seat back 1 by stitching.

[0022] As shown in FIG. 1, the seat cushion 2 is a seating portion that supports the seated person from below, and is configured by placing a cushion material 2a on a cushion frame (not shown) that serves as the skeleton, and covering it with a skin material 2b. Similarly, the seat cushion 2 is composed of a central portion 2A located in the center of the seat width direction, and left and right side portions 2B (side bolster portions) located outside the central portion 2A in the seat width direction. On the surface of the cushion material 2a, left and right skin hanging grooves 2aa are formed, which extend in the vertical direction so as to separate the central portion 2A from the left and right side portions 2B. The headrest 3 supports the head of the occupant from behind, and is configured by placing a cushion material 3a on a headrest pillar (not shown) that serves as a core material, and covering it with a skin material 3b.

[0023] The cushion material 10 is a pad member made of urethane foam or the like. The skin material 20 is made of a resin material (for example, TPO), a fabric (for example, a PET material), genuine leather, or the like, and is formed into a shape that allows the cushion material 10 to be covered from the outside. In the above-described configuration, a seat heater 40 is attached between the cushion material 10 and the cover material 20 in the seat back 1, as shown in FIG. In addition, a seat heater 40 is also attached to the seat cushion 2 between the cushion material 2a and the covering material 2b.

[0024] As shown in FIGS. 2 and 3A to 3D, the pocket 30 is a bag-shaped pocket (back pocket) formed in the lower part of the rear surface of the seat back 1, and has an opening 30a at its upper end. The pocket 30 has a sheet-like pocket forming sheet 31 (pocket forming member) that is superimposed on the outer surface of the back side skin material 20a located on the rear surface of the seat back 1, and a plate-like plate member 32 that is attached to the pocket forming sheet 31 at a position corresponding to the opening 30a. The pocket 30 also has a plate stitching portion 33 for attaching the plate member 32 to the pocket forming sheet 31, as shown in FIG. 3A, and a pocket stitching portion 34 for attaching the pocket forming sheet 31 in an overlapping state to the back side skin material 20a, as shown in FIGS. 3B-3D.

[0025] The pocket forming sheet 31 is made of a sheet-like material similar to the skin material 20, and is a substantially rectangular sheet for forming the pocket 30. As shown in FIG. 3A, a plate member 32 elongated in the sheet width direction is attached to one end in the vertical direction of the rear surface of the pocket forming sheet 31.

[0026] The plate member 32 is a reinforcing member that increases the strength of the opening 30a of the pocket 30, and is made of a resin material having a predetermined hardness and elasticity. As shown in FIG. 3D, the length of the plate member 32 corresponds to the length of the opening 30a of the pocket 30. The plate seam 33 extends along the extending direction of the plate member 32, straddling the plate member 32 in the sheet width direction, and extends to positions that reach both left and right ends of the pocket forming sheet 31. The plate sewn portion 33 and the pocket sewn portion 34 are sewn portions formed by a sewing operation using, for example, a known automatic sewing machine (XY automatic sewing machine).

[0027] As shown in Figures 3B and 3D, the pocket seam 34 has left and right first seams 34a and second seams 34b that form the upper edge of the pocket 30 and form (divide) the opening of the pocket 30, left and right third seams 34c that form the left and right outer edges of the pocket 30, and a fourth seam 34d that forms the lower edge of the pocket 30. The left and right first seams 34a and second seams 34b are formed at the overlapping portion when the surface of the pocket forming sheet 31 is partially overlapped with the outer surface of the back side skin material 20a, as shown in Figure 3B. On the other hand, the left and right third stitching portions 34c and fourth stitching portions 34d are formed in the folded-back portion by folding back the upper portion (a portion different from the overlapping portion) other than the overlapping portion via the fold 35 provided in the pocket forming sheet 31, as shown in Figures 3B-3D.

[0028] As shown in FIG. 3B, the left and right first seams 34a are formed at positions sandwiching the opening 30a in the seat width direction, and each extends in the seat width direction. In detail, the left and right first stitching portions 34a are positioned at a height position that overlaps with the plate member 32 in the vertical direction, and extend in an approximately straight line from both left and right ends of the pocket forming sheet 31 to a position close to the plate member 32. As shown in FIG. 3D, in this embodiment, the first seam 34a and the fold 35 are arranged at overlapping positions.

[0029] The left and right second seams 34b are formed continuously from the extending ends of the left and right first seams 34a, respectively, and are formed at positions sandwiching the opening 30a in the seat width direction, and extend in a direction intersecting the left and right first seams 34a. In more detail, the left and right second stitching portions 34b extend in a direction approximately perpendicular to the first stitching portion 34a, and more specifically, extend downward from the extending end portion of the first stitching portion 34a and reach one end portion of the pocket forming sheet 31 in the vertical direction. The left and right first and second seams 34a and 34b are disposed at positions that do not intersect with the plate member 32.

[0030] As shown in FIG. 3D, the left and right third seams 34c are formed at both left and right end portions of the pocket forming sheet 31 in the sheet width direction, respectively, and extend longitudinally in the up-down direction. The upper ends of the left and right third seams 34c extend to positions that protrude slightly beyond the upper end of the pocket forming sheet 31. The fourth seam 34d is formed at the lower end of the pocket forming sheet 31, extends elongatedly in the sheet width direction, and connects the left and right third seams 34c. In the above configuration, when attaching the pocket 30, the sewing operation starts from the upper end of the left third sewn portion 34c, and proceeds successively to the left third sewn portion 34c, the fourth sewn portion 34d, and the right third sewn portion 34c, and is completed when the upper end of the right third sewn portion 34c is reached. Note that the sewing operation may also be started from the upper end of the right third sewn portion 34c.

[0031] 2 and 3D, the opening 30a of the pocket 30 is formed in the center of the seat back 1 in the seat width direction, and is not long enough to reach both the left and right ends of the seat back 1. Therefore, with this shape of the opening 30a, the opening 30a closes well and the appearance of the vehicle seat S is not impaired.

[0032] In the above configuration, as shown in FIG. 3D, the left and right second seams 34b are disposed more inward than the left and right third seams 34c in the seat width direction. That is, the opening 30a of the pocket 30 is narrow in the sheet width direction, and the storage portion of the pocket 30 is wide. Therefore, with this shape of the opening 30a, it is possible to increase the capacity of the pocket 30.

[0033] In the above configuration, as shown in FIG. 3D, the plate seam 33 extends in the seat width direction along the extending direction of the plate member 32, and intersects with the left and right second seams 34b. This increases the stitching strength around the opening 30a of the pocket 30. That is, the stitching strength of the first stitched portion 34a and the second stitched portion 34b can be increased.

[0034] <Method for manufacturing vehicle seats> Next, among the steps in the method for manufacturing the vehicle seat S, the step of manufacturing the pocket 30 will be described with reference to FIGS. 3A to 3D. The manufacturing method of the vehicle seat S includes, for example, a step of manufacturing the seat body and a step of manufacturing the pocket 30 on the rear surface of the seat body (seat back 1).

[0035] In the process of manufacturing the pocket 30, first, a "first operation" is performed in which the pocket-forming sheet 31 is superimposed on the outer surface of the back-side skin material 20a, which is part of the skin material 20 of the seat back 1 and is disposed on the rear surface of the seat back 1. Then, a "second operation" is performed in which the pocket-forming sheet is superimposed on the back-side skin material 20a and attached to it by the pocket seam 34.

[0036] In more detail, in the "second operation", the pocket forming sheet 31 is attached using left and right first stitching portions 34a and left and right second stitching portions 34b which are formed at the upper end of the pocket forming sheet 31 at positions sandwiching the opening 30a of the pocket 30 in the sheet width direction to form the opening 30a, left and right third stitching portions 34c which are formed at both left and right ends of the pocket forming sheet 31 to form the left and right outer edges of the pocket 30, and a fourth stitching portion 34d which is formed at the lower end of the pocket forming sheet 31 to form the lower edge of the pocket 30. More specifically, in the "second operation," the surface of the pocket-forming sheet 31 is partially overlapped on the outer surface of the back-side skin material 20a, and the overlapped portion is attached by the left and right first seams 34a and the left and right second seams 34b. Then, the portion other than the overlapped portion is folded back along the fold line 35 provided in the pocket-forming sheet 31, and the folded back portion is further attached by the left and right third seams 34c and the left and right fourth seams 34d.

[0037] The above manufacturing method makes it possible to realize a manufacturing method for a vehicle seat that can ensure the capacity of the pocket without compromising the appearance of the vehicle seat. Furthermore, it is possible to realize a manufacturing method for a vehicle seat that allows the pocket to be formed in a simple manner.

[0038] <Second embodiment of the pocket> Next, a pocket 130 according to a second embodiment will be described with reference to FIGS. 4A to 4D. The explanation of the contents overlapping with the pocket 30 described above will be omitted. Pocket 130 differs from pocket 30 primarily in the configuration of pocket seams 134.

[0039] Pocket 130 has an opening 130a at its upper end, and is mainly composed of a pocket forming sheet 131, a plate-shaped plate member 132, a plate seam 133, and a pocket seam 134. The pocket forming sheet 131 is a substantially rectangular sheet, and left and right sheet pieces 131 a are formed at the corners of both left and right ends of the pocket forming sheet 131 so as to partially protrude from the main body of the pocket forming sheet 131 . As shown in FIG. 3A, a plate member 132 in the form of a plate elongated in the sheet width direction is attached to one end in the vertical direction of the rear surface of the pocket forming sheet 131.

[0040] The pocket seam 134 has left and right first seams 134a and second seams 134b that form the pocket opening 130a, left and right third seams 134c that form the left and right outer edges of the pocket 130, and a fourth seam 134d that forms the lower edge of the pocket 130.

[0041] The second stitching portion 134b has a first extending portion 134ba extending in a direction (downward) perpendicular to the first stitching portion 134a, and a second extending portion 134bb continuing from the extending end of the first extending portion 134ba and extending at a downward incline toward the outside in the seat width direction. The second extending portion 134bb extends in a direction inclined relative to the first seam portion 134a, and more specifically, extends while inclining downward toward the outside in the seat width direction so as to move away from the first seam portion 134a. The second extending portion 134bb is formed so as to extend along the outer edge of the sheet piece 131a of the pocket forming sheet 131. The above configuration can further increase the stitching strength of the opening 130a of the pocket 130 and the area around the opening 130a. Also, when an occupant puts small items in the pocket 130 or takes small items out of the pocket 130, interference with the first stitched portion 134a and the second stitched portion 134b can be avoided.

[0042] Even in the second embodiment, when forming a pocket on the rear surface of the vehicle seat, it is possible to ensure the capacity of the pocket without detracting from the appearance of the vehicle seat. Furthermore, it is possible to form the pocket simply.

[0043] <Seat heater details> Next, the seat heater 40 will be described in detail with reference to FIGS. The seat heater 40 of this embodiment is mainly characterized in that it can be attached to the cover material 20, which has integrated therewith a cotton-like wadding material 21, by sewing only to the wadding material 21 with a blind stitch, so that the stitching line is not exposed.

[0044] In the prior art, a seat heater is known, as disclosed in International Publication No. 2014 / 091710, in which a sheet-shaped seat heater is attached to a cover material with a cotton-like wadding material by stitching. The seat heater is sewn to the cover material, and the stitching lines are exposed on the outer surface of the cover material. This can affect the appearance of the vehicle seat and impair its design. Alternatively, to make the stitching lines as inconspicuous as possible, the stitching lines have been aligned with the lines (seams) where the cover material is attached. Therefore, an object of the present invention is to provide a vehicle seat equipped with a sheet-shaped seat heater, in which the seat heater can be suitably attached to the upholstery material without impairing the appearance of the vehicle seat.

[0045] FIG. 5 shows a state in which the seat heater 40 is attached by blind stitching to the rear surface of the cover material 20 with the wadding material 21 attached thereto. A cotton-like wadding material 21 (slab material) is attached by adhesive to the substantially entire back surface of the cover material 20. However, the method is not limited to adhesive, and the attachment may be by sewing, for example.

[0046] As shown in Figures 1 and 5, the seat heater 40 is a sheet-shaped heating element (planar heating element) that warms the seat body, and as shown in Figure 1, it is attached inside the seat back 1 and is arranged between the cushion material 10 and the cover material 20. The seat heater 40 is also attached inside the seat cushion 2. The seat heater 40 attached to the seat back 1 will be described below.

[0047] The seat heater 40 is mainly composed of a rectangular central heater 40a disposed in the central portion 1A of the seat back 1, and side heaters 40b, 40c disposed in the left and right side portions 1B. The seat heater 40 is mainly composed of a sheet-shaped seat base material 41, electric wires 42 attached to the seat base material 41 and connected to a power source (not shown), a heater wire 43 connected to the electric wire 42, a temperature measurement sensor (thermistor) (not shown) connected to the electric wire 42, and a temperature adjustment device (thermostat) (not shown) connected to the electric wire 42. Electrical wires 42, heater wires 43, a temperature measurement sensor, and a temperature adjustment device are densely arranged at the lower end portion of the seat heater 40, and a cover member 44 is attached to cover these components.

[0048] The electric wires 42 supply electricity from a power source (not shown) to the heater wire 43, the temperature measurement sensor, and the temperature adjustment device. At one end of the electric wires 42, a harness 42a is formed by bundling a plurality of the electric wires 42 together. One end of the harness 42a is attached to the seat base material 41, and the other end extends so as to protrude from above the seat base material 41 and is connected to a power source and a control device.

[0049] The central heater 40a is attached by a heater stitching portion 45 to the back surface of the cover material 20 with the wadding material 21 attached thereto. As shown in Figures 5 and 6A, the heater stitching portion 45 is a stitching portion formed by blind stitching the central heater 40a and the wadding material 21 of the cover material 20, and is formed, for example, by an automatic sewing machine (XY automatic sewing machine). Specifically, the heater stitching portion 45 has a first stitching portion 45a that stitches the upper end portion of the central heater 40a, a second stitching portion 45b that stitches the lower end portion of the central heater 40a, and left and right third stitching portions 45c that stitch the left and right end portions of the central heater 40a. The heater stitching portion 45 (particularly the second stitching portion 45b) is formed on the sheet substrate 41 at a position that avoids the electric wire 42 and the heater wire 43, and each extends linearly.

[0050] Similarly, the side heater 40b (40c) is attached to the rear surface of the cover material 20 with the wadding material 21 by means of heater stitching 46 (blind stitch). The heater stitching portion 46 has a first stitching portion 46a that stitches the upper end portion of the side heater 40b, and a second stitching portion 46b that stitches the lower end portion of the side heater 40b. The first stitched portion 46a extends linearly along the seat width direction, and the second stitched portion 46b is arranged on the left and right to avoid the electric wire 42 and the heater wire 43, and is formed to have an approximately L-shape.

[0051] In the above configuration, as shown in FIG. 5, the first stitched portion 45a and the second stitched portion 45b of the heater stitched portion 45 extend so as to intersect with the third stitched portions 45c on the left and right sides, respectively. Therefore, the central heater 40a can be firmly attached to the cover material 20 (wadding material 21). In particular, by using a blind stitch, the stitching line is not exposed, so the heater stitching portion 45 can be positioned more freely than in the past. For example, as in this embodiment, the heater stitching portion 45 can be formed on the inner side in the seat width direction relative to the left and right skin hanging grooves 10a.

[0052] In addition, in the above configuration, by employing blind stitches as shown in FIG. 5, the side heaters 40b, 40c can be attached to the cover material 20 (wadding material 21) by a simple sewing operation using the first stitching portion 45a and the second stitching portion 45b. That is, it is no longer necessary to align the stitching line of the heater stitching portion 46 with the formation line of the skin hanging groove 10a, as in the conventional case.

[0053] In the above configuration, in addition to the mounting structure shown in FIG. 6A, the mounting structure shown in FIG. 6B can also be adopted. In FIG. 6B, a wadding material 21 is attached to the back surface of the covering material 20, and a back surface material 22 having a higher elastic modulus (harder) than the wadding material 21 is further attached to the back surface of the wadding material 21. The backing material 22 is, for example, nylon half or circular knit, and is attached to the back surface of the wadding material 21 with an adhesive or the like. The seat heater 40 is attached to the cover material 20, which is an integrated body of the wadding material 21 and the backing material 22, by sewing only the backing material 22 with a blind stitch. By performing the above-described close stitching, the seam line is not exposed and the seat heater 40 can be firmly attached. The seat heater 40 may be attached by sewing it to the wadding material 21 and the backing material 22 with a blind stitch.

[0054] In the above configuration, as shown in FIG. 7, one end (lower end) in the up-down direction of the sheet base material 41 is formed to be narrower than the main body portion of the sheet base material 41. This allows the lower end of the seat heater 40 to be easily folded back using the second seam 45b as a fold line. This facilitates the installation of the components of the seat heater 40 (the electric wire 42, the heater wire 43, the temperature measurement sensor, and the temperature adjustment device). Furthermore, by folding back the lower end of the seat heater 40, it is easy to check the installation position of the components and to confirm that there are no abnormalities.

[0055] <Other embodiments> In the above embodiment, as shown in FIG. 3C, the pocket 30 is formed by folding the pocket forming sheet 31 once, but this is not particularly limited, and the pocket 30 does not necessarily have to be formed by folding it.

[0056] In the above embodiment, as shown in Figure 3A, the strength of the opening 30a of the pocket 30 is increased by attaching a plate-shaped plate member 32 to the pocket forming sheet 31, but this is not particularly limited and the plate member 32 may not be attached.

[0057] In the above embodiment, a vehicle seat used in an automobile was described as a specific example, but the present invention is not limited to this and can also be used as a vehicle seat for trains, buses, etc., as well as airplanes, ships, etc.

[0058] In the present embodiment, the vehicle seat and the method for manufacturing the vehicle seat according to the present invention have been mainly described. However, the above embodiment is merely an example for facilitating understanding of the present invention, and does not limit the present invention. The present invention can be modified and improved without departing from the spirit thereof, and the present invention naturally includes equivalents thereof. [Explanation of symbols]

[0059] S Vehicle seat 1 seat back 1A, 2A central part 1B, 2B side section 2 seat cushions 2a, 3a cushioning material 2aa Epidermis hanging groove 2b, 3b Skin material 3 Headrest 10 Cushioning material 10a Skin hanging groove 20 Skin material 20a Back side skin material 21 Wadding material 22 Backing material 30, 130 pockets 30a, 130a opening 31, 131 Pocket forming sheet (pocket forming member) 131a Sheet piece 32, 132 Plate members 33, 133 Plate suture 34, 134 Pocket suture 34a, 134a 1st suture 34b, 134b 2nd suture 134ba 1st extension 134bb 2nd extension 34c, 134c 3rd suture 34d, 134d 4th suture 35, 135 folds 40 Seat heater 40a central heater 40b, 40c Side heater 41 Sheet substrate 42 Electric wire 42a Harness 43 Heater wire 44 Cover member 45 Heater seam 45a 1st suture 45b 2nd suture 45c 3rd suture 46 Heater seam 46a 1st suture 46b 2nd suture

Claims

1. A vehicle seat having a pocket on the rear surface of the seat back, The seat back has a skin material that serves as a covering material for the seat back, The pocket is a sheet-like pocket forming member that is superimposed on an outer surface of a back surface covering material that is located on the rear surface of the seat back; a pocket stitching portion for attaching the pocket forming member to the back surface material in an overlapping state, The pocket seam is left and right first seams provided at an upper end of the pocket forming member to form an opening of the pocket, formed at positions sandwiching the opening in the seat width direction, and each extending in the seat width direction; left and right second seams formed at positions sandwiching the opening in the seat width direction, connected to the left and right first seams, respectively, and extending in a direction intersecting the left and right first seams; left and right third seams formed at both ends of the pocket forming member in the sheet width direction and extending in the up-down direction to form left and right outer edge portions of the pocket; a fourth seam formed at a lower end of the pocket forming member and extending in the seat width direction to form a lower edge of the pocket, The vehicle seat is characterized in that the left and right second seams are located more inward than the left and right third seams in the seat width direction.

2. the left and right first seams and the left and right second seams are formed on the overlapped portion in a state in which a surface of the pocket forming member is partially overlapped with an outer surface of the back-side skin material, The vehicle seat according to claim 1, characterized in that the left and right third seams and the fourth seams are formed in the folded portion by folding back the portion other than the overlapping portion via a fold provided in the pocket forming member.

3. The pocket has a plate-shaped plate member attached to a position of the pocket forming member corresponding to the opening and extending in the sheet width direction along the opening, The vehicle seat according to claim 1, characterized in that the plate member is disposed between the left and right second seams in the seat width direction and is disposed at a position that does not intersect with the left and right second seams.

4. the pocket has a plate seam for attaching the plate member to the pocket forming member; The vehicle seat according to claim 3, wherein the plate seam extends in the seat width direction along the extending direction of the plate member and intersects with the left and right second seams.

5. The vehicle seat according to claim 1 , wherein the left and right second seam portions extend in a direction substantially perpendicular to the left and right first direction portions, respectively.

6. The second suture portion is a first extending portion extending in a direction intersecting the first stitching portion; The vehicle seat according to claim 1, further comprising: a second extension portion connected to the first extension portion and extending from the first extension portion toward the outside in the seat width direction in a direction intersecting the first extension portion.

7. The vehicle seat according to claim 6, wherein the second extension portion of the second stitched portion extends in a direction inclined relative to the first stitched portion.

8. The vehicle seat according to claim 6, wherein the second extension portion of the second sewn portion extends outward in the seat width direction so as to move away from the first sewn portion.

9. A method for manufacturing a vehicle seat having a pocket on the rear surface of a seat back, comprising: manufacturing the pocket; In the step of manufacturing the pocket, a sheet-like pocket forming member is superimposed on an outer surface of a back surface side skin material that is disposed on the rear surface of the seat back, among skin materials that serve as covering materials for the seat back; and attaching the pocket forming member to the back surface skin material by a pocket stitching portion in a state where the pocket forming member is overlapped with the back surface skin material. When attaching the pocket forming member, left and right first seams provided at an upper end of the pocket forming member to form an opening of the pocket, formed at positions sandwiching the opening in the seat width direction, and each extending in the seat width direction; left and right second seams formed at positions sandwiching the opening in the seat width direction, connected to the left and right first seams, respectively, and extending in a direction intersecting the left and right first seams; left and right third seams that are formed at both ends of the pocket forming member in the seat width direction to form left and right outer edge portions of the pocket, and that extend in the up-down direction so as to position the left and right second seams on the inside in the seat width direction; a fourth seam formed at the lower end of the pocket forming member and extending in the seat width direction to form the lower edge of the pocket.

10. When attaching the pocket forming member, a surface of the pocket forming member is partially overlapped with an outer surface of the back surface-side skin material, and the overlapped portion is attached by the left and right first seams and the left and right second seams; 10. The method for manufacturing a vehicle seat according to claim 9, further comprising the steps of: folding back the portion other than the overlapping portion via a fold provided in the pocket forming member; and then attaching the folded-back portion by the left and right third seams and the fourth seams.

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