Vehicle seat and manufacturing method of vehicle seat

Abstract

The present application provides a vehicle seat and a manufacturing method of a vehicle seat, capable of forming a bag with a large capacity on a rear surface of the seat without impairing the appearance of the vehicle seat. The vehicle seat includes a bag on a rear surface of a seat back. The bag has a bag forming sheet coinciding with an outer surface of a back surface side skin material on the rear surface of the seat back, and a bag sewing portion. The bag sewing portion has first and second sewing portions on the left and right, formed at positions sandwiching an opening portion of the bag on a seat width direction, third sewing portions on the left and right, forming outer edge portions of the bag on the left and right, and a fourth sewing portion, forming a lower edge portion of the bag. The second sewing portions on the left and right are disposed more inward than the third sewing portions on the left and right on the seat width direction.

Description

Technical Field

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

[0002] Conventionally, there are known vehicle seats comprising a seat back constructed by placing a cushioning material within a back frame serving as a framework and covering the back frame with a surface material. Some of these vehicle seats have a pocket formed therein, which is sewn onto the outer surface of the surface material on the back side of the seat back and is used to store small items (see, for example, Patent Documents 1 and 2).

[0003] The vehicle seat described in Patent Document 1 includes a pocket attached to the rear surface of a seat back by sewing. The pocket is sized to reach both left and right ends of the seat back in the seat width direction, and the opening of the pocket is also long enough to reach both left and right ends of the seat back.

[0004] The vehicle seat described in Patent Document 2 also includes a pocket attached to the rear surface of the seat back by sewing. The pocket is located in the center of the seat back in the width direction of the seat and is slightly narrower than the seat back. Furthermore, the opening of the pocket is also of a length corresponding to the size of the pocket.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Laid-Open No. 10-327978

[0008] Patent Document 2: Japanese Patent Application Laid-Open No. 2010-105485 Summary of the Invention

[0009] Problems to be solved by the invention

[0010] Furthermore, in the case of a vehicle seat having a bag shape as in Patent Document 1, although the capacity can be relatively large, since the opening of the bag extends to the left and right ends of the seat back, not only is the closure of the opening poor, but the appearance of the vehicle seat is also poor, which may impair the design.

[0011] Furthermore, in the case of a bag-shaped vehicle seat as disclosed in Patent Document 2, the opening of the bag has a length corresponding to the size of the bag. Although this does not impair the appearance of the vehicle seat, the bag capacity is reduced, potentially degrading functionality.

[0012] Therefore, when forming a pocket on the rear surface of a vehicle seat, a technology is required that can maximize the capacity of the pocket without impairing the aesthetic appearance of the vehicle seat.

[0013] Furthermore, when forming a pocket on the rear surface of a vehicle seat, a technique capable of forming the pocket relatively easily is required.

[0014] The present invention has been made in view 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, which can ensure the capacity of the pocket when forming a pocket on the rear surface of the vehicle seat without damaging the appearance of the vehicle seat.

[0015] Furthermore, another object of the present invention is to provide a vehicle seat and a method for manufacturing the vehicle seat, which enable a pocket to be formed simply when forming the pocket on the rear surface of the vehicle seat.

[0016] Technical means to solve the problem

[0017] The problem is solved by the following manner, that is, a seat for a vehicle includes a bag on the rear surface of a seat back, wherein the seat back has a surface material as a covering material for the seat back, and the bag has: a sheet-shaped bag-forming member overlapping with the outer surface of the back-side surface material located on the rear surface of the seat back; and a bag sewing portion for mounting the bag-forming member on the back-side surface material in an overlapping state, the bag sewing portion having: left and right first sewing portions, which are provided at the upper end portion of the bag-forming member in order to form an opening portion of the bag, are formed at a position sandwiching the opening portion in the seat width direction, and are respectively along the seat The bag is provided with a second suture portion on the left and right sides, the second suture portion on the left and right sides being formed at a position sandwiching the opening portion in the seat width direction, being connected to the first suture portion on the left and right sides, and extending in a direction intersecting the first suture portion on the left and right sides; the third suture portion on the left and right sides being formed at both ends of the bag-forming component in the seat width direction in order to form the left and right outer edges of the bag, and extending in the up-down direction; and the fourth suture portion being formed at the lower end of the bag-forming component in order to form the lower edge of the bag, and extending in the seat width direction, the second suture portion on the left and right sides being arranged more innerward than the third suture portion on the left and right sides in the seat width direction.

[0018] With this structure, it is possible to realize a vehicle seat capable of ensuring the capacity of the bag without impairing the appearance of the vehicle seat.

[0019] Specifically, the bag seams comprise left and right first seams, provided at the upper ends of the bag-forming member to form the bag opening. These seams are formed at positions sandwiching the opening in the seat width direction and extend along the seat width; and left and right second seams are formed at positions sandwiching the opening in the seat width direction, connected to the left and right first seams, and extend in a direction intersecting the first seams. In other words, the bag opening is formed in the center of the seat back in the seat width direction, rather than extending to the left and right ends of the seat back. Therefore, the shape of the opening does not detract from the aesthetics of the vehicle seat.

[0020] Furthermore, the left and right second stitching portions sandwiching the bag opening are positioned further inward in the seat width direction than the left and right third stitching portions forming the left and right outer edges of the bag.

[0021] Therefore, if the opening has the above-described shape, the capacity of the bag can be ensured (enlarged).

[0022] At this time, the left and right first stitching portions and the left and right second stitching portions are formed on the overlapping portions in a state in which the surface of the bag forming member is partially overlapped with the outer surface of the back side surface material, and the left and right third stitching portions and the fourth stitching portions are formed on the folded portions in a state in which the portions other than the overlapping portions are folded over via a folding line provided on the bag forming member.

[0023] With this structure, when forming a pocket on the rear surface of a vehicle seat, the sewing line can be made as inconspicuous as possible, thereby ensuring design quality. In addition, the pocket can be manufactured using a relatively simple manufacturing method.

[0024] In this case, the bag may include a plate-shaped member, which is installed at a position corresponding to the opening in the bag forming member and extends along the seat width direction along the opening. The plate member is arranged between the left and right second stitched portions in the seat width direction and is arranged at a position that does not intersect with the left and right second stitched portions.

[0025] With this structure, the strength of the opening of the bag and the area around the opening can be increased, thereby improving the functionality of the bag.

[0026] Furthermore, the presence of the plate member facilitates the formation of the bag.

[0027] In this case, the bag may include a plate sewing portion for attaching the plate member to the bag forming member, the plate sewing portion extending in the seat width direction along an extending direction of the plate member and intersecting the left and right second sewing portions.

[0028] This structure can improve the sewing strength around the opening of the bag, that is, the sewing strength of the first and second sewn parts can be improved.

[0029] In this case, the left and right second sewn portions may extend in directions substantially orthogonal to the left and right first sewn portions, respectively.

[0030] With this structure, it is possible to minimize interference with the second stitched portion when the passenger uses the bag (when inserting his hands into the bag).

[0031] In this case, the second stitched portion may include: a first extension portion extending in a direction intersecting the first stitched portion; and a second extension portion connected to the first extension portion and extending from the first extension portion toward the outer side in the seat width direction in a direction intersecting the first extension portion.

[0032] Furthermore, the second extending portion of the second sewn portion may extend in a direction inclined with respect to the first sewn portion.

[0033] Furthermore, the second extending portion of the second sewn portion may extend outward in the seat width direction so as to be away from the first sewn portion.

[0034] With this structure, the sewing strength of the bag's opening and the periphery of the opening (the left and right ends of the opening) can be further improved.

[0035] Furthermore, with this structure, it is possible to prevent the passenger from interfering with the second sewn portion when putting small items into the bag or taking small items out of the bag.

[0036] Moreover, the problem is also solved by a method for manufacturing a seat for a vehicle, wherein the seat for a vehicle includes a bag on the rear surface of the seat back, and the method for manufacturing the seat for a vehicle is characterized in that it includes a process for manufacturing the bag, in which the following steps are performed: overlapping a sheet-like bag-forming component with the outer surface of a back-side surface material arranged on the rear surface of the seat back in a surface material serving as a covering material for the seat back; and installing the bag-forming component to the back-side surface material through a bag stitching portion in an overlapping state, and when installing the bag-forming component, installing the bag-forming component through left and right first stitching portions, left and right second stitching portions, left and right third stitching portions, and fourth stitching portions, and the left and right first stitching portions are for forming the bag-forming component. The opening of the bag is provided at the upper end portion of the bag forming member, is formed at a position sandwiching the opening in the seat width direction, and extends respectively in the seat width direction. The left and right second stitching portions are formed at a position sandwiching the opening in the seat width direction, are connected to the left and right first stitching portions, and extend in a direction intersecting the left and right first stitching portions. The left and right third stitching portions are formed at the two end portions in the seat width direction of the bag forming member to form the left and right outer edges of the bag, and extend in the up and down direction in such a manner that the left and right second stitching portions are arranged on the inner side in the seat width direction. The fourth stitching portion is formed at the lower end portion of the bag forming member to form the lower edge of the bag, and extends in the seat width direction.

[0037] At this time, when installing the bag forming member, the overlapping part can be installed by the left and right first stitching parts and the left and right second stitching parts in a state where the surface of the bag forming member is partially overlapped with the outer surface of the back side surface material, and the folded part can be further installed by the left and right third stitching parts and the fourth stitching parts in a state where the part other than the overlapping part is folded over via a fold line provided on the bag forming member.

[0038] Effects of the Invention

[0039] According to the present invention, a vehicle seat can be realized that can ensure the capacity of the bag without impairing the appearance of the vehicle seat.

[0040] Specifically, the opening of the pocket is formed in the center of the seat back in the seat width direction, and does not have a length that reaches the left and right ends of the seat back. Therefore, if the shape of the opening is as described above, the aesthetic appearance of the vehicle seat will not be damaged.

[0041] Moreover, the bag is constructed so that the opening is narrow and the accommodating portion is wide. Therefore, if the shape of the opening is such, the capacity of the bag can be ensured (enlarged).

[0042] Furthermore, according to the present invention, the seam line can be made as inconspicuous as possible, thereby ensuring design properties. Furthermore, the bag can be manufactured using a relatively simple manufacturing method.

[0043] Furthermore, according to the present invention, the strength of the bag opening and the periphery of the opening can be increased, thereby improving the functionality of the bag.

[0044] Furthermore, according to the present invention, the sewing strength around the opening of the bag can be improved.

[0045] Furthermore, according to the present invention, it is possible to prevent the passenger from interfering with the second stitched portion when using the bag (when inserting his hands into the bag).

[0046] Furthermore, according to the present invention, the sewing strength of the bag opening and its periphery (the left and right ends of the opening) can be further improved. Furthermore, it is possible to prevent passengers from interfering with the second sewing portion when placing or removing small items from the bag. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 This is a perspective view of the vehicle seat according to the present embodiment.

[0048] Figure 2 This is a perspective view of the vehicle seat as seen from the rear side.

[0049] Figure 3A It is a diagram showing a state where the plate member is sewn to the bag forming member.

[0050] Figure 3B It means Figure 3A FIG. 1 is a diagram showing a state in which the bag forming member is overlapped with the back surface material and sewn together.

[0051] Figure 3C Yes Figure 3B FIG. 1 shows a state where the bag forming member is folded over.

[0052] Figure 3D It means from Figure 3C FIG. 1 is a diagram showing a state in which the bag forming member is sewn together.

[0053] Figure 4A It is a diagram showing a state where a plate member is sewn to a bag-forming member according to a second embodiment.

[0054] Figure 4B It means Figure 4A FIG. 1 is a diagram showing a state in which the bag forming member is overlapped with the back surface material and sewn together.

[0055] Figure 4C Yes Figure 4BFIG. 1 shows a state where the bag forming member is folded over.

[0056] Figure 4D It means from Figure 4C FIG. 1 is a diagram showing a state in which the bag forming member is sewn together.

[0057] Figure 5 It is a plan view showing the seat heaters (center heater and side heaters).

[0058] Figure 6A This is a VI-VI cross-sectional view of the seat heater.

[0059] Figure 6B This is a VI-VI cross-sectional view of the seat heater according to Modification 1.

[0060] Figure 7 It is a top view of the central heater, and is a diagram showing that the central heater can be partially folded.

[0061] Explanation of symbols

[0062] S: Seat for transportation

[0063] 1: Seat back

[0064] 1A, 2A: Central

[0065] 1B, 2B: Side

[0066] 2: Seat cushion

[0067] 2a, 3a: cushioning material

[0068] 2aa: The skin is snapped into the slot

[0069] 2b, 3b: surface material

[0070] 3: Headrest

[0071] 10: cushioning material

[0072] 10a: The skin is snapped into the groove

[0073] 20: Surface material

[0074] 20a: Back surface material

[0075] 21: Lining

[0076] 22: Back material

[0077] 30, 130: bag

[0078] 30a, 130a: opening

[0079] 31, 131: Bag forming sheet (bag forming member)

[0080] 131a: Sheet

[0081] 32, 132: Plate components

[0082] 33, 133: Plate suture

[0083] 34, 134: Bag sewing part

[0084] 34a, 134a: First suture portion

[0085] 34b, 134b: Second stitching part

[0086] 134ba: First extension

[0087] 134bb: Second extension

[0088] 34c, 134c: Third suture

[0089] 34d, 134d: Fourth suture

[0090] 35, 135: Broken line

[0091] 40: Seat heater

[0092] 40a: Central heater

[0093] 40b, 40c: Side heaters

[0094] 41: Seat base material

[0095] 42: Wires

[0096] 42a: Harness

[0097] 43: Heating wire

[0098] 44: Cover member

[0099] 45: Heater stitching

[0100] 45a: First suture portion

[0101] 45b: Second suture portion

[0102] 45c: Third suture

[0103] 46: Heater stitching

[0104] 46a: First suture portion

[0105] 46b: Second suture portion DETAILED DESCRIPTION

[0106] Below, refer to Figures 1 to 7 Embodiments of the present invention will be described.

[0107] The present embodiment relates to the invention of a seat for a vehicle, wherein the seat for a vehicle includes a bag on the rear surface of the seat back, and the main feature of the seat for a vehicle is that the bag has a sheet-shaped bag-forming member overlapping with the outer surface of the back-side surface material located on the rear surface of the seat back, and a bag sewing portion, the bag sewing portion having: left and right first sewing portions, which are arranged at the upper end portion of the bag-forming member to form the opening portion of the bag, and are formed at a position clamping the opening portion in the width direction of the seat; left and right second sewing portions, which are similarly formed at a position clamping the opening portion, and extend in a direction intersecting with the left and right first sewing portions; left and right third sewing portions, which form the left and right outer edge portions of the bag; and a fourth sewing portion, which forms the lower edge portion of the bag, and the left and right second sewing portions are arranged more inwardly than the left and right third sewing portions.

[0108] Note that the side of the vehicle seat on which the occupant sits relative to the seat back is referred to as the seat front side.

[0109] The vehicle seat S of this embodiment is as follows Figure 1 As shown, a vehicle seat mainly includes: a seat body, a seat back 1, a seat cushion 2 and a headrest 3; a bag 30 installed on the rear surface of the seat back 1; and a sheet-like seat heater 40 installed inside the seat body.

[0110] Seat back 1 Figure 1 、 Figure 2 As shown, the backrest supports the back of the seated person from behind, and is constructed by placing a cushioning material 10 on a back frame (not shown) serving as a skeleton and covering it with a surface material 20.

[0111] The seat back 1 includes a central portion 1A located in the center in the seat width direction, and left and right side portions 1B (side bolsters) located outward of the central portion 1A in the seat width direction.

[0112] On the surface of the cushioning mat material 10 , left and right surface engaging grooves 10 a are formed, extending in the up-down direction so as to define the central portion 1A and the left and right side portions 1B.

[0113] A bag-shaped bag 30 capable of storing small items and the like is attached to the rear surface of the seat back 1 by sewing.

[0114] Seat cushion 2 Figure 1 As shown, the seat portion supports the seated person from below, and is constructed by placing a cushion material 2a on a seat cushion frame (not shown) serving as a framework and covering the cushion material 2a with a surface material 2b.

[0115] The seat cushion 2 also includes a central portion 2A located in the center in the seat width direction and left and right side portions 2B (side cushion portions) located outward of the central portion 2A in the seat width direction.

[0116] On the surface of the cushioning mat material 2a, left and right surface engaging grooves 2aa are formed, extending in the up-down direction so as to define the central portion 2A and the left and right side portions 2B.

[0117] The headrest 3 supports the head of the occupant from behind, and is formed by placing a cushioning material 3 a on a headrest pillar (not shown) as a core material and covering the cushioning material 3 a with a surface material 3 b.

[0118] The cushioning mat material 10 is a cushion member made of urethane foam or the like.

[0119] The surface material 20 includes a resin material (such as thermoplastic polyolefin (TPO)), a fabric (such as polyethylene terephthalate (PET)), or genuine leather, and is formed into a shape capable of covering the cushioning material 10 from the outside.

[0120] In the structure, Figure 1 As shown, in the seat back 1 , a seat heater 40 is installed between the cushion material 10 and the surface material 20 .

[0121] Furthermore, in the seat cushion 2 , a seat heater 40 is also installed between the cushion material 2 a and the surface material 2 b .

[0122] Bag 30 as Figure 2 、 Figures 3A to 3D As shown, a bag-shaped bag (bag) is formed at the lower portion of the rear surface of the seat back 1 and has an opening 30a at its upper end.

[0123] The bag 30 includes: a sheet-like bag-forming sheet 31 (bag-forming member) overlapping with the outer surface of the back-side surface material 20a located on the rear surface of the seat back 1; and a plate-like plate member 32 installed at a position corresponding to the opening 30a in the bag-forming sheet 31.

[0124] Furthermore, the bag 30 has: a plate seam 33 for Figure 3A As shown, the plate member 32 is mounted on the bag forming sheet 31; and the bag sewing portion 34 is used as shown. Figures 3B to 3D As shown, the bag forming sheet 31 is attached to the back surface material 20a in a superimposed state.

[0125] The bag forming sheet 31 is formed of a sheet-like material similar to the surface material 20 , and is a substantially rectangular sheet for forming the bag 30 .

[0126] like Figure 3A As shown, a plate-shaped plate member 32 elongated in the seat width direction is attached to one end portion in the vertical direction of the back surface of the bag forming sheet 31 .

[0127] The plate member 32 is a reinforcing member for increasing the strength of the opening 30 a of the bag 30 , and is formed of a resin material having predetermined hardness and elasticity.

[0128] like Figure 3D As shown, the length of the plate member 32 corresponds to the length of the opening 30 a of the bag 30 .

[0129] The plate seam portion 33 extends along the extending direction of the plate member 32 and extends across the plate member 32 in the seat width direction until reaching the left and right end portions of the pocket forming sheet 31 .

[0130] The plate sewn portion 33 and the bag sewn portion 34 are sewn portions formed by sewing work using, for example, a well-known automatic sewing machine (XY automatic sewing machine).

[0131] Bag seam 34 as Figure 3B 、 Figure 3D As shown, it has: left and right first stitching parts 34a and second stitching parts 34b, which form the upper edge of the bag 30 and form (divide) the opening of the bag 30; left and right third stitching parts 34c, which form the left and right outer edges of the bag 30; and fourth stitching parts 34d, which form the lower edge of the bag 30.

[0132] The first stitching portion 34a and the second stitching portion 34b on the left and right sides are as shown in FIG. Figure 3B As shown, the surface of the bag forming sheet 31 is partially overlapped with the outer surface of the back surface material 20a, and the overlapping portion is formed.

[0133] On the other hand, the third stitching portion 34c and the fourth stitching portion 34d on the left and right are as shown in FIG. Figures 3B to 3D As shown, the upper portion other than the overlapping portion (a portion different from the overlapping portion) is folded along a fold line 35 provided on the bag forming sheet 31, and the folded portion is formed.

[0134] The first stitching portions 34a on the left and right are as follows Figure 3B As shown, they are formed at positions sandwiching the opening portion 30a in the seat width direction and extend in the seat width direction.

[0135] Specifically, the left and right first sewn portions 34 a are arranged at height positions overlapping the plate member 32 in the vertical direction and extend substantially linearly from the left and right ends of the bag-forming sheet 31 to positions close to the plate member 32 .

[0136] In addition, if Figure 3D As shown, in this embodiment, the first stitching portion 34 a and the folding line 35 are arranged at a position where they overlap.

[0137] The left and right second sewn portions 34b are formed continuously from the extended ends of the left and right first sewn portions 34a, are formed at positions sandwiching the opening 30a in the seat width direction, and extend in a direction intersecting the left and right first sewn portions 34a.

[0138] Specifically, the left and right second sewn portions 34 b extend in a direction substantially perpendicular to the first sewn portion 34 a , and specifically, extend downward from the extended end of the first sewn portion 34 a to reach one end of the bag-forming sheet 31 in the vertical direction.

[0139] In addition, the left and right first sewn portions 34 a and the second sewn portions 34 b are arranged at positions that do not intersect with the plate member 32 .

[0140] The third stitching portion 34c on the left and right is as follows Figure 3D As shown, the pockets are formed at both left and right end portions of the seat width direction of the pocket forming sheet 31 and extend long in the up-down direction.

[0141] In addition, the upper end portions of the left and right third sewn portions 34 c extend to positions slightly protruding from the upper end portion of the bag-forming sheet 31 .

[0142] The fourth sewn portion 34 d is formed at the lower end portion of the bag forming sheet 31 , extends to become longer in the seat width direction, and connects the left and right third sewn portions 34 c .

[0143] Specifically, in the above structure, when installing the bag 30, the sewing operation starts from the upper end of the third sewing portion 34c on the left side, and the sewing is continuously advanced to the third sewing portion 34c on the left side, the fourth sewing portion 34d, and the third sewing portion 34c on the right side. The sewing operation is completed when the upper end of the third sewing portion 34c on the right side is reached. Alternatively, the sewing operation can be reversed and started from the upper end of the third sewing portion 34c on the right side.

[0144] By means of the structure, Figure 2 、 Figure 3DAs shown, the opening portion 30a of the bag 30 is formed in the central portion in the seat width direction of the seat back 1, and does not become the length up to the left and right end portions of the seat back 1. Therefore, if the shape of the opening portion 30a is as described above, the closing property of the opening portion 30a is made good, and the beauty of the vehicle seat S is not impaired.

[0145] Further, in the structure, as shown in Figure 3D As shown, the left and right second sewn portions 34b are disposed more inward in the seat width direction than the left and right third sewn portions 34c.

[0146] That is, the opening portion 30a of the bag 30 is narrow in the seat width direction, and the housing portion of the bag 30 is wide.

[0147] Therefore, if the shape of the opening portion 30a is as described above, the capacity of the bag 30 can be increased.

[0148] Further, in the structure, as shown in Figure 3D As shown, the plate sewn portion 33 extends in the seat width direction along the extension direction of the plate member 32, and intersects the left and right second sewn portions 34b.

[0149] Therefore, the sewn strength of the periphery of the opening portion 30a of the bag 30 can be increased. That is, the sewn strength of the first sewn portion 34a and the second sewn portion 34b can be increased.

[0150] <Manufacturing method of vehicle seat>

[0151] Next, the procedure of manufacturing the bag 30 in each procedure of the manufacturing method of the vehicle seat S will be described based on Figures 3A to 3D

[0152] In addition, the manufacturing method of the vehicle seat S includes, for example, a procedure of manufacturing the seat body, and a procedure of manufacturing the bag 30 on the rear surface of the seat body (seat back 1).

[0153] In the procedure of manufacturing the bag 30, first, a "first work" is performed, that is, the bag forming sheet 31 is overlapped on the outer surface of the back surface side skin material 20a of the skin material 20 disposed on the rear surface of the seat back 1. Subsequently, a "second work" is performed, that is, the bag forming sheet is installed to the back surface side skin material 20a by the bag sewn portion 34 in the overlapped state.

[0154] ​To describe in detail, in the "second operation", the bag-forming sheet 31 is installed by the left and right first sewing portions 34a and the left and right second sewing portions 34b, the left and right third sewing portions 34c, and the fourth sewing portions 34d. The left and right first sewing portions 34a and the left and right second sewing portions 34b are provided at the upper end portion of the bag-forming sheet 31 in order to form the opening portion 30a of the bag 30, and are formed at a position sandwiching the opening portion 30a in the seat width direction. The left and right third sewing portions 34c are formed at the left and right ends of the bag-forming sheet 31 in order to form the left and right outer edge portions of the bag 30, and the fourth sewing portion 34d is formed at the lower end portion of the bag-forming sheet 31 in order to form the lower edge portion of the bag 30.

[0155] To further detail, in the "second operation," the surface of the bag-forming sheet 31 is partially overlapped with the outer surface of the back-side surface material 20a, and the overlapped portion is attached using left and right first stitching portions 34a and left and right second stitching portions 34b. Furthermore, the portion other than the overlapped portion is folded along a fold line 35 provided on the bag-forming sheet 31, and the folded portion is further attached using left and right third stitching portions 34c and fourth stitching portions 34d.

[0156] The above-described manufacturing method can realize a method for manufacturing a vehicle seat that can ensure the capacity of the bag without impairing the appearance of the vehicle seat.

[0157] Furthermore, a method for manufacturing a vehicle seat capable of simply forming the pocket can be realized.

[0158] <Second embodiment of the bag>

[0159] Next, based on Figures 4A to 4D The bag 130 according to the second embodiment will be described.

[0160] In addition, description of the contents that are the same as those of the bag 30 will be omitted.

[0161] The bag 130 differs from the bag 30 mainly in the structure of the bag seam portion 134 .

[0162] The bag 130 has an opening 130 a at its upper end, and mainly includes a bag forming sheet 131 , a plate-like plate member 132 , a plate sewn portion 133 , and a bag sewn portion 134 .

[0163] The bag forming sheet 131 is a substantially rectangular sheet, and left and right sheet pieces 131 a are formed at the corners of the left and right ends of the bag forming sheet 131 so as to partially protrude from the main body of the bag forming sheet 131 .

[0164] like Figure 3AAs shown, a plate-shaped plate member 132 elongated in the seat width direction is attached to one end portion in the vertical direction of the back surface of the bag forming sheet 131 .

[0165] The bag sewing portion 134 includes left and right first sewing portions 134a and second sewing portions 134b forming the bag opening 130a, left and right third sewing portions 134c forming the left and right outer edges of the bag 130, and a fourth sewing portion 134d forming the lower edge of the bag 130.

[0166] The second sewn portion 134b includes a first extending portion 134ba extending in a direction (downward) perpendicular to the first sewn portion 134a and a second extending portion 134bb extending continuously from the extending end of the first extending portion 134ba toward the outside in the seat width direction while tilting downward.

[0167] The second extension portion 134bb extends in a direction inclined with respect to the first sewn portion 134a. Specifically, the second extension portion 134bb extends while inclining downward toward the outer side in the seat width direction so as to be separated from the first sewn portion 134a.

[0168] Furthermore, the second extension portion 134 bb is formed so as to extend along the outer edge of the sheet piece 131 a of the bag forming sheet 131 .

[0169] This structure can further improve the sewing strength of the opening 130a and the periphery of the opening 130a of the bag 130. In addition, it can prevent the passenger from interfering with the first and second sewn portions 134a, 134b when placing or removing small items from the bag 130.

[0170] Even in the second embodiment, when a pocket is formed on the rear surface of the vehicle seat, the capacity of the pocket can be ensured without impairing the appearance of the vehicle seat.

[0171] Seat heater details

[0172] Next, based on Figures 5 to 7 The seat heater 40 will be described in detail.

[0173] The main feature of the seat heater 40 of the present embodiment is that the surface material 20 integrated with the lining material 21 is sewn only to the lining material 21 by blind stitching, thereby being attached so that the sewing line is not exposed.

[0174] Furthermore, regarding prior art, International Publication No. 2014 / 091710 discloses a method of attaching a sheet-like seat heater to a surface material with a quilted lining by sewing. The seat heater is sewn to the surface material, with the seam exposed on the outer surface of the surface material. This can affect the aesthetics of the vehicle seat and compromise its design. Alternatively, to minimize the conspicuousness of the seam, the seam is aligned with the line (seam) forming the surface material's snap-in groove.

[0175] Therefore, an object is to provide a vehicle seat including a sheet-like seat heater, in which the seat heater can be preferably attached to a surface material without impairing the appearance of the vehicle seat.

[0176] Figure 5 This figure shows a state where the seat heater 40 is attached to the back surface of the surface material 20 of the lining material 21 by blind stitching.

[0177] A flocculent lining material 21 (spun material) is attached to the substantially entire surface of the back surface of the surface material 20 by means of an adhesive. The material is not limited to an adhesive and may be attached by sewing, for example.

[0178] Seat heater 40 Figure 1 、 Figure 5 As shown, it is a sheet-like heating element (surface heating element) that heats the seat body. Figure 1 As shown, it is installed inside the seat back 1 and is arranged between the cushion material 10 and the surface material 20 .

[0179] In addition, a seat heater 40 is also installed inside the seat cushion 2 .

[0180] Next, the seat heater 40 attached to the seat back 1 will be described.

[0181] The seat heater 40 mainly includes a rectangular center heater 40 a disposed in the center portion 1A of the seat back 1 , and side heaters 40 b and 40 c disposed in the left and right side portions 1B.

[0182] The seat heater 40 mainly includes: a sheet-like seat base material 41; electric wires 42, which are respectively installed on the seat base material 41 and connected to a power source not shown in the figure; a heating wire 43, which is connected to the electric wire 42; a temperature measuring sensor (thermistor) not shown in the figure, which is connected to the electric wire 42; and a temperature adjustment device (thermostat) not shown in the figure, which is connected to the electric wire 42.

[0183] Electric wires 42 , heating wires 43 , a temperature measuring 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.

[0184] The electric wires 42 are supplied with electricity from a power source (not shown) to the heating wire 43, the temperature measuring sensor, and the temperature adjustment device.

[0185] The wire harness 42 a is attached to the seat base material 41 at one end thereof and extends so as to protrude from the seat base material 41 at the other end thereof, and is connected to a power source and a control device.

[0186] The central heater 40 a is attached to the back surface of the surface material 20 with the lining material 21 via a heater sewn portion 45 .

[0187] The heater sewing portion 45 is as follows Figure 5 、 Figure 6A As shown, the seam portion is formed by blind-stitching the central heater 40a and the lining material 21 in the surface material 20, for example, by an automatic sewing machine (XY automatic sewing machine).

[0188] Specifically, the heater sewing portion 45 includes a first sewing portion 45a sewing the upper end of the central heater 40a, a second sewing portion 45b sewing the lower end of the central heater 40a, and left and right third sewing portions 45c sewing the left and right ends of the central heater 40a.

[0189] The heater sewn portion 45 (particularly the second sewn portion 45 b ) is formed on the seat base material 41 at a position avoiding the electric wire 42 and the heating wire 43 , and extends linearly.

[0190] Similarly, the side heaters 40 b ( 40 c ) are attached to the back surface of the surface material 20 with the lining material 21 by means of a heater sewing portion 46 (blind stitch).

[0191] The heater sewn portion 46 includes a first sewn portion 46a sewing the upper end portion of the side heater 40b and a second sewn portion 45b sewing the lower end portion of the side heater 40b.

[0192] The first sewn portion 46 a extends linearly in the seat width direction, and the second sewn portion 46 b is arranged on the left and right avoiding the electric wire 42 and the heating wire 43 , and is formed in a substantially L-shape.

[0193] In the structure, Figure 5As shown, the first sewn portion 45a and the second sewn portion 45b of the heater sewn portion 45 extend so as to intersect with the left and right third sewn portions 45c, respectively.

[0194] Therefore, the central heater 40a can be firmly attached to the surface material 20 (lining material 21). In particular, by adopting the blind stitch, the sewing line is not exposed, so the heater sewn portion 45 can be formed with a free arrangement compared to the conventional method.

[0195] For example, as in the present embodiment, the heater sewn portion 45 may be formed further inward in the seat width direction than the left and right cover engagement grooves 10 a.

[0196] Moreover, in the structure, Figure 5 As shown, by adopting the blind stitch, the side heaters 40b and 40c can be attached to the surface material 20 (lining material 21) through a simple sewing operation using the first sewing portion 45a and the second sewing portion 45b.

[0197] That is, it is no longer necessary to align the sewing line of the heater sewing portion 46 with the formation line of the skin engaging groove 10 a as in the conventional method.

[0198] Moreover, in the structure, in addition to Figure 6A In addition to the mounting structure shown, it is also possible to use Figure 6B The installation structure shown.

[0199] Figure 6B In the embodiment, a lining material 21 is attached to the back surface of a surface material 20 , and a back material 22 having a larger elastic modulus (harder) than that of the lining material 21 is further attached to the back surface of the lining material 21 .

[0200] The backing material 22 is, for example, nylon half or circular knit, and is attached to the back surface of the lining material 21 by adhesive or the like.

[0201] Furthermore, the seat heater 40 is attached to the surface material 20 in which the lining material 21 and the backing material 22 are integrated, by being sewn only to the backing material 22 by blind stitching.

[0202] By performing blind stitching in this manner, the seat heater 40 can be securely attached without exposing the stitching line.

[0203] Alternatively, the seat heater 40 may be attached by sewing the seat heater 40 to the lining material 21 and the backing material 22 by blind stitching.

[0204] Moreover, in the structure, Figure 7 As shown, one end portion (lower end portion) of the seat base 41 in the vertical direction is formed to be narrower than the main body portion of the seat base 41 .

[0205] This allows the lower end of the seat heater 40 to be easily folded over, using the second stitched portion 45b as a fold line. This facilitates installation of the various components of the seat heater 40 (electrical wires 42, heating wires 43, temperature sensors, and temperature control devices). Furthermore, by folding the lower end of the seat heater 40, it is easy to confirm the installation positions of the various components and verify that there are no abnormalities.

[0206] <Other implementation methods>

[0207] In the embodiment, Figure 3C As shown, the bag 30 is formed by folding the bag forming sheet 31 once, but the present invention is not particularly limited and the bag 30 does not necessarily need to be formed by folding.

[0208] In the embodiment, Figure 3A As shown, the strength of the opening 30 a of the bag 30 is improved by attaching the plate-like plate member 32 to the bag forming sheet 31 . However, this is not particularly limited and the plate member 32 may not be attached.

[0209] In the above embodiment, a vehicle seat for automobiles is described as a specific example, but the invention is not particularly limited and can be used as a vehicle seat for airplanes, ships, and the like in addition to vehicles for trains and buses.

[0210] In the present embodiment, the vehicle seat and the method for manufacturing the vehicle seat according to the present invention are mainly described.

[0211] However, the above-described embodiment is merely an example for facilitating understanding of the present invention and does not limit the present invention. The present invention can be changed and improved without departing from the spirit thereof, and the present invention naturally includes equivalents thereof.

Claims

1. A vehicle seat comprising a pocket on a rear surface of a seat back, wherein the vehicle seat is characterized in that: The seat back has a surface material as a covering material of the seat back. The bag has: a sheet-like pocket-forming member overlapping the outer surface of the back-side surface material located on the rear surface of the seat back; and a bag sewing portion for attaching the bag forming member to the back surface material in an overlapping state; The bag seam portion has: Left and right first sewn portions are provided on the upper end portion of the bag forming member to form the opening of the bag, are formed at positions sandwiching the opening in the seat width direction, and extend in the seat width direction respectively; Left and right second stitching portions are formed at positions sandwiching the opening portion in the seat width direction, are connected to the left and right first stitching portions, and extend in a direction intersecting the left and right first stitching portions; Left and right third sewn portions are formed at both ends of the bag forming member in the seat width direction in order to form left and right outer edges of the bag, and extend in the up-down direction; and a fourth sewn portion formed at the lower end of the bag forming member to form the lower edge of the bag and extending in the seat width direction; The left and right second stitching portions are arranged further inward than the left and right third stitching portions in the seat width direction. The left and right second sewn portions extend downward from the extended ends of the left and right first sewn portions.

2. The vehicle seat according to claim 1, wherein: The left and right first stitching portions and the left and right second stitching portions are formed at the overlapping portions in a state where the surface of the bag forming member partially overlaps with the outer surface of the back surface material. The third and fourth stitched portions on either side are formed on the folded portions in a state where portions other than the overlapping portions are folded along a folding line provided on the bag forming member. The left and right second sewn portions extend in a direction substantially orthogonal to the left and right first sewn portions, and extend downward from extended end portions of the left and right first sewn portions.

3. The vehicle seat according to claim 1, wherein: The pocket includes a plate-shaped member that is attached to the pocket forming member at a position corresponding to the opening and extends in the seat width direction along the opening. The plate member is disposed between the left and right second stitched portions in the seat width direction and is disposed at a position not intersecting with the left and right second stitched portions. The opening is formed in a central portion of the seat back in the seat width direction and does not have a length that reaches both left and right end portions of the seat back.

4. The vehicle seat according to claim 3, wherein: The bag has a plate sewing portion for attaching the plate member to the bag forming member, The plate stitching portion extends in the seat width direction along the extending direction of the plate member and intersects with the left and right second stitching portions.

5. The vehicle seat according to claim 1, wherein: The left and right second sewn portions extend in directions substantially orthogonal to the left and right first sewn portions, respectively.

6. The vehicle seat according to claim 1, wherein: The second stitching portion has: a first extending portion extending in a direction intersecting the first suture portion; as well as The second extension portion is connected to the first extension portion and extends from the first extension portion toward an outer side in the seat width direction in a direction intersecting the first extension portion.

7. The vehicle seat according to claim 6, wherein: The second extending portion of the second sewn portion extends in a direction inclined with respect to the first sewn portion.

8. The vehicle seat according to claim 6, wherein: The second extending portion of the second sewn portion extends toward the outer side in the seat width direction so as to be away from the first sewn portion.

9. A method for manufacturing a vehicle seat, the vehicle seat comprising a pocket on a rear surface of a seat back, the method for manufacturing the vehicle seat being characterized by: The process of manufacturing the bag comprises: During the process of manufacturing the bag: Overlaying a sheet-like bag-forming member on the outer surface of a back-side surface material disposed on the rear surface of the seat back, among the surface materials serving as a covering material of the seat back; and The bag forming member is attached to the back surface material through the bag sewing portion in an overlapping state. When the bag forming member is installed, the bag forming member is installed by the left and right first sewing parts, the left and right second sewing parts, the left and right third sewing parts, and the fourth sewing parts. The left and right first sewn portions are provided at the upper end of the bag forming member to form the opening of the bag, are formed at positions sandwiching the opening in the seat width direction, and extend in the seat width direction respectively. The left and right second stitching portions are formed at positions sandwiching the opening portion in the seat width direction, are connected to the left and right first stitching portions, and extend in a direction intersecting the left and right first stitching portions. The left and right third stitching portions are formed at both ends of the bag forming member in the seat width direction in order to form the left and right outer edges of the bag, and extend in the vertical direction so as to arrange the left and right second stitching portions inward in the seat width direction. The fourth sewn portion is formed at the lower end of the bag forming member to form the lower edge of the bag and extends in the seat width direction. The left and right second sewn portions extend downward from the extended ends of the left and right first sewn portions.

10. The method for manufacturing a vehicle seat according to claim 9, wherein: When installing the bag forming member, In a state where the surface of the bag forming member is partially overlapped with the outer surface of the back surface material, the overlapping portion is attached by the left and right first sewing portions and the left and right second sewing portions. In a state where a portion other than the overlapping portion is folded along a fold line provided on the bag forming member, the folded portion is further attached by the left and right third sewing portions and the fourth sewing portion.

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