Vehicle seat structure

Abstract

To provide a vehicular seat structure that can suppress loads from concentrating on an article or the like when the article or the like contacts a ventilation part, while avoiding the ventilation part from being exposed to a vehicle interior.SOLUTION: A vehicular seat 1 comprises a seat back cushion 32 forming a seating face, a blower fan 34 for adjusting peripheral air around the seating face, and a seat back cover 33 covering the seat back cushion 32. The seat back cover 33 includes a ventilation part 331 having ventilation characteristics communicated with the blower fan 34 and formed at a position where a portion different from the seating face of the seat back cushion 32 is covered, and a covering part 332 formed at a position where the part covers the ventilation part 331 from the outside of the seat.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a vehicle seat structure. [Background technology]

[0002] Conventionally, there are known seats for use in vehicles such as automobiles that are equipped with an air conditioning function capable of adjusting the air around the seat and the seat back. In a vehicle seat equipped with an air conditioning function, a vent (air vent) is provided in the cushion material forming the seat, and a blower (fan) is provided at a position communicating with the vent. For example, Patent Document 1 discloses a vehicle seat in which a rear seat face outlet is provided on the back of the seat back on the front seat side. In this vehicle seat, the rear seat face outlet is connected to a rear air passage through which the conditioned air from the interior air conditioning unit is guided, and the blowing direction of the conditioned air to the rear seat side can be adjusted by an up-down adjustment louver provided in the rear seat face outlet. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2016 / 158472 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the conventional vehicle seat structure described above, if a ventilation part such as a rear seat face air outlet is provided on the rear surface of the front seat back, the ventilation part is exposed to the interior of the vehicle and is visible to the passengers in the rear seats, which may impair the appearance of the vehicle seat and, ultimately, the aesthetic appearance of the interior of the vehicle. In addition, if the ventilation part is exposed to the interior of the vehicle, it is necessary to take care that the load is not concentrated on the items, etc., when the items, etc., come into contact with the ventilation part.

[0005] The present invention has been made with attention to the above-mentioned points, and aims to provide a vehicle seat structure that can prevent the ventilation part from being exposed to the vehicle interior, while suppressing the concentration of load on items, etc. when the items, etc. come into contact with the ventilation part. [Means for solving the problem]

[0006] In order to achieve the above object, one aspect of the vehicle seat structure according to the present invention provides a vehicle seat structure including a cushion material forming a seat surface, a blower device for adjusting the air around the seat surface, and a seat cover for covering the cushion material. In this vehicle seat structure, the seat cover includes a ventilation part having air permeability, which is connected to the blower device and is formed in a position covering a part of the cushion material different from the seat surface, and a covering part formed in a position covering the ventilation part from the outside of the seat. a seat component having flexibility is disposed between the ventilation portion and the covering portion, and a ventilation space is formed by the ventilation portion, the covering portion, and the seat component. . Effect of the Invention

[0007] According to one aspect of the vehicle seat structure of the present invention, a ventilation portion is provided in the seat cover and is covered from the outside of the seat by a covering portion, thereby making it possible to prevent the ventilation portion from being exposed to the vehicle interior while suppressing the concentration of load on items, etc. when they come into contact with the ventilation portion. [Brief description of the drawings]

[0008] [Figure 1] 1 is a perspective view showing the appearance of a vehicle seat structure according to an embodiment of the present invention; [Diagram 2] 2 is a rear view showing the seat of FIG. 1 with a headrest removed and a covering portion of a seat back cover rolled up. FIG. [Diagram 3] 3 is a rear view of the seat in FIG. 2 with the seat cover removed. FIG. [Figure 4] 4 is a rear view showing the seat of FIG. 3 with the cushioning removed. FIG. [Diagram 5] FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. [Figure 6]FIG. 11 is a rear view showing a state in which a headrest is removed and a covering portion of a seat back cover is flipped up in a seat according to a modified example related to the above embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, a vehicle seat structure according to one embodiment of the present invention will be described with reference to the drawings (FIGS. 1 to 5). In the drawings, the direction of the arrow Fr indicates the front in the front-rear direction of the vehicle seat. The "front portion (front end) and rear portion (rear end)" in the description of the embodiment correspond to the front portion and rear portion in the front-rear direction of the seat. Furthermore, the front of the seat in the front-rear direction in this embodiment corresponds to the front in the front-rear direction of the vehicle. The directions of the arrows R and L indicate the right and left sides when an occupant is seated in the vehicle seat. The direction of the arrow U indicates the upward direction.

[0010] Fig. 1 is a perspective view showing the appearance of a vehicle seat 1 to which the structure according to this embodiment is applied. Fig. 2 is a rear view of the vehicle seat 1 of Fig. 1. Fig. 2 shows a state in which the headrest 35 of the vehicle seat 1 is removed and the covering portion 332 of the seat back cover 33 is folded up to the upper rear side of the seat. When the vehicle seat 1 is in use, the covering portion 332 is placed over the front side under the seat, as shown by the two-dot chain line in Fig. 2.

[0011] 1 and 2, a vehicle seat 1 includes a seat portion 10 and a seat back 30. As shown in FIG. The seat 10 is a portion on which an occupant sits. The seat 10 includes a seat frame 11, a seat cushion 12 that forms a seating surface, and a seat cover 13 that covers the seat cushion 12.

[0012] The seat back 30 is a portion that extends upward from the rear of the seat portion 10, and is configured to support, in particular, the upper body of an occupant seated on the seat portion 10. The seat back 30 has a seat back frame 31 (FIG. 4 described later), a seat back cushion 32 that forms the seat surface, a seat back cover 33 that covers the seat back cushion 32, a blower fan 34 that adjusts the air around the seat surface, and a headrest 35 that supports the head of the occupant.

[0013] In this embodiment, the seatback cushion 32 corresponds to the "cushion material" of the present invention, the seatback cover 33 corresponds to the "seat cover" of the present invention, and the blower fan 34 corresponds to the "blower device" of the present invention. Each member of the vehicle seat 1 will be specifically described below.

[0014] Fig. 3 is a rear view showing a state in which the seat cover 13 and the seat back cover 33 of the vehicle seat 1 of Fig. 2 have been removed. Fig. 4 is a rear view showing a state in which the seat cushion 12 and the seat back cushion 32 of the vehicle seat 1 of Fig. 3 have been removed. Fig. 5 is a cross-sectional view taken along line AA of Fig. 2.

[0015] As shown in Figures 1 to 5, a seat frame 11 of the seat 10 constitutes the skeleton of the seat 10. The lower part of the seat frame 11 is movably attached to left and right seat rails 2 via running parts (not shown) at both sides in the seat width direction (Figures 1 to 4). The seat rails 2 are provided on a floor part (not shown) in the vehicle cabin and extend in the front-rear direction of the vehicle.

[0016] The seat cushion 12 has elastic properties and is installed on the upper part of the seat frame 11 (FIGS. 1 to 3 and 5). The upper part of the seat cushion 12 forms a seating surface on which an occupant sits. The seat cover 13 is a trim that covers the seat cushion 12 from above (FIGS. 1 and 2). The seat cover 13 covers the upper part (seating surface), front part, rear part, and both left and right side parts of the seat cushion 12.

[0017] The seatback frame 31 of the seatback 30 has a frame body 311, a fan fixing bracket 312, an airbag fixing bracket 313, a plurality of wiring brackets 314A to 314C, and an S-shaped spring 315 (FIGS. 4 and 5).

[0018] The frame body 311 is a member that constitutes the framework of the seatback frame 31, and is formed into a substantially rectangular shape by bending a pipe-shaped member (FIG. 4). The frame body 311 has an upper cross frame 311A ​​extending in the seat width direction, left and right side frames 311B, 311C extending downward from the left and right ends of the upper cross frame 311A ​​and arranged parallel to each other, and a lower cross frame 311D extending in the seat width direction so as to connect the lower ends of the left and right side frames 311B, 311C. The upper cross frame 311A ​​and the lower cross frame 311D are each horizontal and extend parallel to each other. The left and right side frames 311B, 311C each extend in a cross direction that crosses the seat width direction. In this embodiment, the left side frame 311B corresponds to the "first side frame" of the present invention, the right side frame 311C corresponds to the "second side frame" of the present invention, and the lower cross frame 311D corresponds to the "cross frame" of the present invention.

[0019] The fan fixing bracket 312 extends in the seat width direction, and both longitudinal ends are attached to the upper parts of the left and right side frames 311B, 311C (FIGS. 4 and 5). The blower fan 34 is fixed to the longitudinal middle part of the fan fixing bracket 312. That is, in the vehicle seat 1 according to this embodiment, the blower fan 34 is installed in the upper part of the seat back 30 near the center in the seat width direction.

[0020] A flexible fan connecting wire harness (first cord-like body) 51 is connected to the blower fan 34. The fan connecting wire harness 51 supplies power to the blower fan 34 from a battery device (not shown) mounted on the vehicle body. The fan connecting wire harness 51 is supported at a predetermined position along the frame main body 311 by wiring brackets 314A and 314B. Here, the wiring bracket 314A is attached to the center of the lower cross frame 311D, and the wiring bracket 314B is attached to a lower part of the left side frame 311B. Specific wiring of the fan connecting wire harness 51 will be described later.

[0021] The airbag fixing bracket 313 is attached to the center of the right side frame 311C in the up-down direction of the seat (FIG. 4). An airbag device 71 extending along the right side frame 311C is fixed to the airbag fixing bracket 313. The airbag device 71 is a side airbag that protects an occupant in the event of a side collision, and is disposed on the outer side in the vehicle width direction inside the vehicle cabin.

[0022] A flexible airbag connecting wire harness (second cord-like body) 52 is connected to the airbag device 71. The airbag connecting wire harness 52 supplies power from the battery device to the airbag device 71. The airbag connecting wire harness 52 is supported at a predetermined position along the frame main body 311 by the routing bracket 314A and a routing bracket 314C attached to the right end of the lower cross frame 311D. The specific routing of the airbag connecting wire harness 52 will be described later.

[0023] In this embodiment, the fan connecting wire harness 51 and the airbag connecting wire harness 52 correspond to the "seat components" of the present invention. The airbag device 71 corresponds to the "seat side device" of the present invention, and the battery device corresponds to the "vehicle body side device" of the present invention.

[0024] The S-shaped spring 315 is disposed along the seat width direction so as to connect the left and right side frames 311B, 311C of the frame main body 311 (FIGS. 3 and 4). In this embodiment, the two S-shaped springs 315 are disposed with a gap between them in the vertical direction.

[0025] The seat back cushion 32 has a main body portion 32A, left and right side cushion portions 32B, 32C, and a recessed portion 32D (FIGS. 1 to 3 and 5). The main body 32A has elastic properties and is a portion that covers the frame main body 311 of the seat back frame 31. Specifically, the upper portion of the main body 32A covers the upper cross frame 311A ​​of the frame main body 311 from above, and the lower portion of the main body 32A covers the lower cross frame 311D of the frame main body 311 from below (FIG. 5). The front surface of the main body 32A serves as a seat surface (support surface) that supports the back of the occupant. A plurality of air outlets 32E are formed on the front side of the main body 32A (FIGS. 1 and 5). Each air outlet 32E is connected to an air flow path 32F formed inside the main body 32A, and the air around the seat is guided to the blower fan 34 through each air outlet 32E and the flow path 32F, or the air from the blower fan 34 is blown to the seat surface through the flow path 32F and each air outlet 32E (FIG. 5).

[0026] The left and right side cushion parts 32B, 32C have elastic properties, are disposed on the outer sides of the main body part 32A in the seat width direction, and extend in the vertical direction (FIGS. 1 and 3). The left side cushion part 32B covers the left side frame 311B of the seatback frame 31 from the side. The right side cushion part 32C covers the right side frame 311C of the seatback frame 31 and the airbag device 71 from the side.

[0027] The recess 32D is provided on the rear side of the main body 32A between the left and right side cushion parts 32B, 32C, and is recessed toward the front of the seat (FIGS. 3 and 5). The upper end of the recess 32D is located in the middle of the main body 32A in the up-down direction, and the lower end of the recess 32D is located in the lower part of the main body 32A. Two S-shaped springs 315 are arranged inside the recess 32D so as to cross the recess 32D.

[0028] The seat back cover 33 is a trim that covers the seat back cushion 32 from above, and covers the front and rear surfaces of the main body 32A of the seat back cushion 32 and the outer surfaces of the left and right side cushion parts 32B and 32C (FIGS. 1, 2, and 5). The area surrounding the area facing each air outlet 32E in the part covering the front surface of the main body 32A of the seat back cover 33 is configured to have higher breathability than other areas of the area. The seat back cover 33 of this embodiment also includes a ventilation part 331 and a covering part 332 in the part covering the lower rear surface of the seat back cushion 32 (FIGS. 2 to 5). The two-dot chain lines shown in FIG. 3 and FIG. 4 virtually show the outer shape and arrangement of the ventilation part 331 and the covering part 332 of the seat back cover 33 when the vehicle seat 1 is in use.

[0029] The ventilation part 331 is formed at a position that communicates with the blower fan 34 and covers a portion of the seat back cushion 32 that is different from the seat surface (front surface) of the seat back cushion 32. In this embodiment, the inner space of the recess 32D of the seat back cushion 32 communicates with the blower fan 34, and the ventilation part 331 is formed at a position that covers a portion of the seat back cover 33 from a position facing the lower part of the front wall of the recess 32D to the lower end of the rear surface of the main body part 32A (FIGS. 2 to 5). The ventilation part 331 is formed using a cloth-like material (e.g., Queen's cord, etc.) that has high breathability similar to the surrounding area of ​​the seat back cover 33 facing the above-mentioned respective air outlets 32E. In other words, the surrounding area of ​​the seat back cover 33 facing the respective air outlets 32E and the ventilation part 331 are configured to have higher breathability than the other areas. The material used for the ventilation part 331 may or may not be translucent.

[0030] Specifically, the ventilation portion 331 is formed in a substantially rectangular shape extending in the seat width direction when viewed from the rear. However, the shape of the ventilation portion 331 is not limited to the above example. The overall width of the ventilation portion 331 in the seat width direction is narrower than the overall width of the main body portion 32A of the seatback cushion 32. The upper end portion and both left and right end portions of the ventilation portion 331 are sewn to the lower part of the rear surface side of the seatback cover 33. The lower portion of the ventilation portion 331 wraps around and covers the main body portion 32A from the lower end of the rear surface side of the main body portion 32A of the seatback cushion 32 toward the front of the lower surface side (FIG. 5).

[0031] The covering portion 332 is formed at a position where it covers the ventilation portion 331 from the outside of the seat (FIGS. 2 to 5). The covering portion 332 is formed using a cloth-like material (e.g., needle punch carpet, etc.) that has low breathability and almost no light transmittance. The covering portion 332 is formed in a substantially trapezoidal shape whose overall width in the seat width direction narrows from the top to the bottom when viewed from the rear in a state where the vehicle seat 1 is in use (a state where the covering portion 332 is placed over the front side of the lower part of the seat) without being rolled up on the upper side of the rear of the seat. However, the shape of the covering portion 332 is not limited to the above example. The overall width of the upper end side of the covering portion 332 is approximately the same as the overall width of the main body portion 32A of the seat back cushion 32, or is wider than the overall width of the main body portion 32A. The upper end portion of the covering portion 332 is sewn to the lower part of the rear surface side of the seat back cover 33 at a position where it roughly overlaps with the upper end portion of the ventilation portion 331 (FIG. 5). The left and right end portions and the lower end portion of the covering portion 332 are not sewn to the seat back cover 33. In other words, the portion of the covering portion 332 other than the sewn portions can be arranged at a distance from the lower rear surface portion including the ventilation portion 331 of the seat back cover 33 to the rear side of the seat. The lower portion of the covering portion 332 covers the main body portion 32A and the seat cushion 12 from the lower end of the rear surface side of the main body portion 32A of the seat back cushion 32 toward the front of the underside of the seat cushion 12, wrapping around the main body portion 32A and the seat cushion 12.

[0032] Further, the ventilation portion 331 is provided with a through hole at a position facing the covering portion 332. In this embodiment, for example, four through holes 331A, 331B, 331C, 331D are provided at intervals in the seat width direction in a portion of the ventilation portion 331 that covers the recess 32D of the seatback cushion 32 (FIGS. 2 to 4). Each of the through holes 331A to 331D penetrates the ventilation portion 331 in the seat front-rear direction and has a slit-like shape extending in the seat up-down direction. The lower end portion of each of the through holes 331A to 331D is adjacent to the lower cross frame 311D.

[0033] Specifically, the first through hole 331A and the second through hole 331B are provided in the center portion in the seat width direction of the ventilation portion 331. In a rear view, the wiring bracket 314A is arranged between the first through hole 331A and the second through hole 331B. The first through hole 331A is arranged on the right side frame 311C (second side frame) side of the second through hole 331B (FIG. 4). The second through hole 331B is arranged on the left side frame 311B (first side frame) side of the first through hole 331A. A fan connection wire harness (first cord-like body) 51 is inserted through the first through hole 331A, and an airbag connection wire harness (second cord-like body) 52 is inserted through the second through hole 331B (FIG. 2). The third through hole 331C is arranged to the left of the second through hole 331B with a gap therebetween. Furthermore, the fourth through hole 331D is disposed to the right of the first through hole 331A with a gap therebetween. It should be noted that the number, shape and arrangement of the through holes provided in the ventilation section 331 are not limited to the above example.

[0034] The blower fan 34 is an air conditioning device for adjusting the air around the seat surface of the seat back 30. The blower fan 34 is configured to be rotatable in both directions by power supplied by a fan connection wire harness 51. When the blower fan 34 rotates in one direction (forward rotation), the air around the seat surface of the seat back 30 is sucked in through each of the air outlets 32E formed on the front side of the main body part 32A of the seat back cushion 32, passes through the flow path 32F inside the main body part 32A, the blower fan 34, the recess 32D of the main body part 32A, and the ventilation part 331 of the seat back cover 33 in this order, and is sent to the rear side of the seat back 30. On the other hand, when the blower fan 34 rotates in the opposite direction (reverse rotation), the air on the rear side of the seat back 30 flows in the opposite direction to that during the forward rotation and is sent to the seat surface of the seat back 30.

[0035] The headrest 35 is configured to support the head of an occupant seated on the seat portion 10 of the vehicle seat 1. The headrest 35 is detachably attached to the seatback frame 31 by being inserted into a headrest guide 36 (FIG. 4) provided in the center portion of the upper cross frame 311A ​​of the seatback frame 31.

[0036] Next, the arrangement of the fan connecting wire harness 51 and the airbag connecting wire harness 52 will be described in detail. 2 to 4, the fan connecting wire harness 51 and the airbag connecting wire harness 52 extend from the wire connecting portion 3 toward the rear of the seat below the seat cushion 12. The fan connecting wire harness 51 extends through the seat cushion 12 to the right side below the seatback frame 31, and the airbag connecting wire harness 52 extends through the seat cushion 12 to the left side below the seatback frame 31.

[0037] The fan-connecting wire harness 51 that has reached the right side portion below the seatback frame 31 curves upward and extends above a lower cross frame 311D of the seatback frame 31. The fan-connecting wire harness 51 then curves toward the left and extends along the seat width direction above the lower cross frame 311D to a wiring bracket 314A that is disposed in the center in the seat width direction.

[0038] At this time, the fan connecting wire harness 51 is inserted from the seat rear side into the first through hole 331A provided in the ventilation part 331 of the seat back cover 33 before reaching the wiring bracket 314A (FIG. 2). That is, the fan connecting wire harness 51 is wired so as to pass through the outside of the ventilation part 331 (the seat rear side) before being inserted into the first through hole 331A, and pass through the inside of the ventilation part 331 (the seat front side) after being inserted into the first through hole 331A. The opening area of ​​the first through hole 331A in the state in which the fan connecting wire harness 51 is inserted is larger than the cross-sectional area of ​​the fan connecting wire harness 51. Therefore, a gap is formed between the fan connecting wire harness 51 and the edge of the first through hole 331A.

[0039] Therefore, in a state where the covering portion 332 of the seat back cover 33 covers the ventilation portion 331 from the outside of the seat (the state of the covering portion 332 shown by the two-dot chain line in FIG. 2), the portion of the fan connecting wire harness 51 located in the section from the right end of the ventilation portion 331 to the first through hole 331A is disposed between the ventilation portion 331 and the covering portion 332. In other words, the fan connecting wire harness 51 is disposed between the ventilation portion 331 and the covering portion 332 in a state where it is inserted through the first through hole 331A, and a gap is formed between the ventilation portion 331 and the edge of the first through hole 331A. In this state, a ventilation space V1 is formed by the ventilation portion 331, the covering portion 332, and the fan connecting wire harness 51 (FIG. 5). This ventilation space V1 communicates with the vehicle interior space at the right end side in the seat width direction.

[0040] The fan-connecting wire harness 51 that has reached the routing bracket 314A is supported by the routing bracket 314A and then extends in the seat width direction above the lower cross frame 311D to the left side frame 311B of the seatback frame 31 (FIG. 4). The fan-connecting wire harness 51 then curves upward and is supported by the routing bracket 314B attached to the left side frame 311B, and then extends upward along the left side frame 311B. The fan-connecting wire harness 51 further curves toward the right just before the fan fixing bracket 312 and extends to the blower fan 34.

[0041] On the other hand, the airbag-connecting wire harness 52 that has reached the left side portion on the lower side of the seatback frame 31 curves upward and extends above a lower cross frame 311D of the seatback frame 31. Then, the airbag-connecting wire harness 52 curves toward the right and extends along the seat width direction above the lower cross frame 311D to a wiring bracket 314A disposed in the center in the seat width direction.

[0042] At this time, the airbag connecting wire harness 52 is inserted from the seat rear side into the second through hole 331B provided in the ventilation part 331 of the seat back cover 33 before reaching the wiring bracket 314A (FIG. 2). That is, the airbag connecting wire harness 52 is wired so as to pass through the outside of the ventilation part 331 (the seat rear side) before being inserted through the second through hole 331B, and pass through the inside of the ventilation part 331 (the seat front side) after being inserted through the second through hole 331B. The opening area of ​​the second through hole 331B in the state in which the airbag connecting wire harness 52 is inserted is larger than the cross-sectional area of ​​the airbag connecting wire harness 52. Therefore, a gap is formed between the airbag connecting wire harness 52 and the edge of the second through hole 331B.

[0043] Therefore, in a state where the covering portion 332 of the seat back cover 33 covers the ventilation portion 331 from the outside of the seat (the state of the covering portion 332 shown by the two-dot chain line in FIG. 2), the portion of the airbag connecting wire harness 52 located in the section from the left end of the ventilation portion 331 to the second through hole 331B is disposed between the ventilation portion 331 and the covering portion 332. In other words, the airbag connecting wire harness 52 is disposed between the ventilation portion 331 and the covering portion 332 in a state where it is inserted through the second through hole 331B, and a gap is formed between the ventilation portion 331 and the edge of the second through hole 331B. In this state, a ventilation space V2 is formed by the ventilation portion 331, the covering portion 332, and the airbag connecting wire harness 52 (FIG. 5). This ventilation space V2 communicates with the vehicle interior space at the left end side in the seat width direction. The ventilation space V1 formed by the fan-connecting wire harness 51 and the ventilation space V2 formed by the airbag-connecting wire harness 52 communicate with each other in the seat width direction. That is, the ventilation spaces V1 and V2 communicate with the vehicle interior space at both ends in the seat width direction.

[0044] The airbag-connecting wire harness 52 that has reached the routing bracket 314A is supported by the routing bracket 314A and then extends in the seat width direction above the lower cross frame 311D to a routing bracket 314C disposed at the right end of the lower cross frame 311D (FIG. 4). Then, after being supported by the routing bracket 314C, the airbag-connecting wire harness 52 curves upward and extends along the right side frame 311C to the airbag device 71.

[0045] Next, the operation of the vehicle seat structure according to this embodiment will be described. In the vehicle seat 1 having the above-described structure, power is supplied from the battery device to the blower fan 34 via the fan connection wire harness 51, causing the blower fan 34 to rotate in a desired direction. Here, for example, the operation of the blower fan 34 when it rotates (forward rotation) in a direction that sends the air around the seat surface of the seat back 30 to the rear side of the seat back 30 will be described with reference to Fig. 5. Note that the case where the blower fan 34 rotates in the opposite direction (reverse rotation) can be considered in the same way as the case where the blower fan 34 rotates forward, and therefore a description thereof will be omitted here.

[0046] 5, the air around the seat surface of the seat back 30 is sucked in through each of the air outlets 32E formed in the main body 32A of the seat back cushion 32, and is guided to the air outlet fan 34 through a flow path 32F inside the main body 32A. The air that has passed through the air outlet fan 34 passes through a space formed between the seat back cover 33 and a recess 32D provided on the rear side of the main body 32A, and then passes through the ventilation part 331 and each of the through holes 331A to 331D of the seat back cover 33, and is guided to the ventilation spaces V1 and V2 formed between the ventilation part 331 and the covering part 332.

[0047] In the ventilation spaces V1, V2 between the ventilation portion 331 and the covering portion 332, the air flow that has passed through the ventilation portion 331 and each of the through holes 331A-331D is blocked by the covering portion 332 because the air permeability of the covering portion 332 is low, and the flow direction of the air changes to the seat width direction. Then, the air flowing in the seat width direction through the ventilation spaces V1, V2 is sent out into the vehicle interior space from the right end side of the ventilation space V1 and the left end side of the ventilation space V2.

[0048] As described above, in the vehicle seat 1 according to the present embodiment, the seat back cover 33 includes the ventilation part 331 having air permeability, which is connected to the blower fan 34 and is formed at a position covering a part of the seat back cushion 32 different from the seat surface, and the covering part 332 formed at a position covering the ventilation part 331 from the outside of the seat. In this structure, the ventilation hole provided in the conventional vehicle seat described above is constituted by the ventilation part 331 of the seat back cover 33. As a result, when an object or the like comes into contact with the position of the ventilation part 331 of the seat back cover 33, the ventilation part 331 can be easily deformed, broken or displaced, and the concentration of the load on the object or the like can be suppressed. In addition, since the ventilation part 331 of the seat back cover 33 is covered from the outside of the seat by the covering part 332, it is possible to prevent the ventilation part 331 from being exposed to the vehicle interior.

[0049] In the vehicle seat 1 according to the present embodiment, the flexible fan-connecting wire harness 51 and the airbag-connecting wire harness 52 are disposed between the ventilation portion 331 and the covering portion 332 of the seat back cover 33, and the ventilation spaces V1 and V2 are formed by the ventilation portion 331 and the covering portion 332 and the fan-connecting wire harness 51 and the airbag-connecting wire harness 52. The formation of such ventilation spaces V1 and V2 can improve the breathability of the ventilation portion 331 of the seat back cover 33. In addition, when an object or the like comes into contact with the seat back cover 33, the flexible fan-connecting wire harness 51 and the airbag-connecting wire harness 52 can be deformed to absorb the load, or the object or the like can be moved toward the seat back cushion 32 together with the wire harness, allowing the seat back cushion 32 to absorb the load. Furthermore, since the fan connecting wire harness 51 and the airbag connecting wire harness 52 are also covered by the covering portion 332 of the seat back cover 33, the wire harnesses can be prevented from being exposed to the passenger compartment.

[0050] Moreover, in the vehicle seat 1 according to the present embodiment, the ventilation portion 331 of the seat back cover 33 has the through-holes 331A-331D at a position facing the covering portion 332. In such a structure, the through-holes 331A-331D are covered by the covering portion 332, and therefore, air can be sent through the through-holes 331A-331D while preventing the through-holes 331A-331D from being exposed to the vehicle interior, and therefore the blowing efficiency of the blower fan 34 can be improved.

[0051] In the vehicle seat 1 according to the present embodiment, the fan connecting wire harness 51 is disposed between the ventilation portion 331 and the covering portion 332 in a state where it is inserted through the first through hole 331A, and a gap is formed between the first through hole 331A and the edge of the first through hole 331A. Similarly, the airbag connecting wire harness 52 is disposed between the ventilation portion 331 and the covering portion 332 in a state where it is inserted through the second through hole 331B, and a gap is formed between the second through hole 331B and the edge of the second through hole 331B. In this structure, even if the first and second through holes 331A and 331B are blocked by the fan connecting wire harness 51 and the airbag connecting wire harness 52, the gap ensures the ventilation of the first and second through holes 331A and 331B. In addition, a portion of the fan-connecting wire harness 51 is disposed on the seat inner side of the first through-hole 331A, and a portion of the airbag-connecting wire harness 52 is disposed on the seat inner side of the second through-hole 331B, so that it is possible to efficiently prevent exposure of the wire harness routed in a position not covered by the covering portion 332 to the inside of the vehicle cabin. In particular, in this embodiment, the wire harness is configured to be pulled in from each of the first and second through-holes 331A and 331B, which are disposed on the seat widthwise inner side among the four through-holes 331A to 331D, so that the wiring harness can be easily routed.

[0052] In the vehicle seat 1 according to the present embodiment, the fan connecting wire harness 51 is supported by the edge of the first through hole 331A, and the airbag connecting wire harness 52 is supported by the edge of the second through hole 331B. In such a structure, the number of support points of the fan connecting wire harness 51 and the airbag connecting wire harness 52 with respect to the seat back frame 31 can be reduced. This allows the number of installation brackets for wiring to be reduced, thereby improving the productivity of the vehicle seat 1 and reducing costs. In addition, the reduction in the number of wiring brackets can reduce the possibility of items, etc. coming into contact with the wiring brackets and concentrating a load on the items, etc.

[0053] In the vehicle seat 1 according to the present embodiment, the fan connecting wire harness 51 that connects the blower fan 34 and the battery device is routed through the first through-hole 331A, and the airbag connecting wire harness 52 that connects the airbag device 71 and the battery device is routed through the second through-hole 331B. This allows the first and second through-holes 331A and 331B to be used as inlets for the wire harnesses, thereby simplifying the seat structure. In addition, the wire harnesses that are drawn into the first and second through-holes 331A and 331B are covered with the covering portion 332, which prevents the appearance of the vehicle seat 1 from being impaired.

[0054] In the vehicle seat 1 according to the present embodiment, a wiring bracket 314A is provided on the lower cross frame 311D of the seatback frame 31, and the fan connecting wire harness 51 and the airbag connecting wire harness 52 are supported by the wiring bracket 314A. The wiring bracket 314A is disposed at a position facing the covering portion 332 of the seatback cover 33, and the fan connecting wire harness 51 and the airbag connecting wire harness 52 have portions that are routed between the wiring bracket 314A and the ventilation portion 331 of the seatback cover 33. In this structure, the fan connecting wire harness 51 and the airbag connecting wire harness 52 are supported by the wiring bracket 314A attached to the seatback frame 31 having high rigidity. Therefore, the fan-connecting wire harness 51 and the airbag-connecting wire harness 52 can be supported by the edges of the first and second through holes 331A and 331B formed in the ventilation part 331 of the seat back cover 33 without applying excessive load to the first and second through holes 331A and 331B. This allows the wire harness to be stably routed while suppressing an increase in the number of wiring brackets. In addition, since the flexible wire harness and the ventilation part 331 and the covering part 332 of the seat back cover 33 are arranged between the wiring bracket 314A and the vehicle interior space, when an article or the like comes into contact with the article or the like, the load applied to the article or the like from the wiring bracket 314A is absorbed by the wire harness or the like, and it is possible to effectively suppress the concentration of the load on the article or the like.

[0055] In the vehicle seat 1 according to this embodiment, the wiring bracket 314A is disposed between the first through hole 331A and the second through hole 331B. As a result, the wiring bracket 314A is covered by a portion of the ventilation portion 331 of the seat back cover 33 located between the first and second through holes 331A, 331B, and is further covered by the covering portion 332, so that it is possible to reliably prevent the wiring bracket 314A from being exposed to the vehicle interior.

[0056] In the vehicle seat 1 according to the present embodiment, the first and second through-holes 331A, 331B are arranged at intervals in the seat width direction, and the ventilation spaces V1, V2 formed by the ventilation part 331 and the covering part 332 of the seat back cover 33 and the wire harnesses 51, 52 communicate with the vehicle interior space at both ends in the seat width direction. In this structure, air that tends to flow in the penetration direction of the first and second through-holes 331A, 331B (seat front-rear direction) can be guided in the seat width direction along the covering part 332 and sent out from both ends in the seat width direction in the ventilation spaces V1, V2 to the vehicle interior space. This makes it possible to suppress a situation in which the air flow on the seat back 30 side gives the occupant a sense of discomfort when an occupant is present at a position facing the covering part 332 of the seat back cover 33 on the rear side of the seat. Specifically, when the air around the seat surface of the seat back 30 is exhausted from the rear surface of the seat back 30, the exhaust air can be prevented from directly hitting the occupant. In addition, when air is sucked in from the rear side of the seat back 30 and blown onto the seat surface of the seat back 30, it is possible to prevent the occupant from feeling uncomfortable as if the air in front of the occupant is being sucked in.

[0057] In the vehicle seat 1 according to the present embodiment, the fan connecting wire harness 51 is routed along the lower cross frame 311D and the left side frame 311B, is supported by the routing bracket 314A, and is inserted through the first through hole 331A. On the other hand, the airbag connecting wire harness 52 is routed along the lower cross frame 311D and the right side frame 311C, is supported by the routing bracket 314A, and is inserted through the second through hole 331B. In this structure, the fan connecting wire harness 51 and the airbag connecting wire harness 52 can be easily routed along the seat back frame 31. In addition, since the fan-connecting wire harness 51 and the airbag-connecting wire harness 52 are supported by the routing bracket 314A, even if an item or the like approaches the routing bracket 314A, the wire harness supported by the routing bracket 314A can withstand the load, thereby making it possible to prevent the load from being concentrated locally on the item or the like.

[0058] In the vehicle seat 1 according to the present embodiment, the first through hole 331A is disposed closer to the right side frame 311C than the second through hole 331B, and the second through hole 331B is disposed closer to the left side frame 311B than the first through hole 331A. The fan connecting wire harness 51 is routed from the first through hole 331A to the left side frame 311B along the lower cross frame 311D, and the airbag connecting wire harness 52 is routed from the second through hole 331B to the right side frame 311C along the lower cross frame 311D. At this time, the routing direction of the fan connecting wire harness 51 and the routing direction of the airbag connecting wire harness 52 are opposite to each other. With such a structure, the fan connecting wire harness 51 and the airbag connecting wire harness 52 can be easily routed individually.

[0059] Next, a modification of the vehicle seat 1 according to the above-described embodiment will be described. Fig. 6 is a rear view showing a modified example of the vehicle seat 1. Note that Fig. 6 shows a state in which the headrest 35 of the vehicle seat 1 is removed and the covering portion 332 of the seat back cover 33 is folded up toward the upper rear side of the seat, similar to Fig. 2 described above.

[0060] In Fig. 6, the structure of the vehicle seat 1 in the above-mentioned modified example differs from that in the above-mentioned embodiment in that the restricting portions 332A, 332B and the holding portions 332C, 332D are provided on the inner surface (the surface facing the ventilation portion 331) of the covering portion 332, and that the fan connecting wire harness 51 and the airbag connecting wire harness 52 are provided with the connectors 51A, 52A, respectively. In addition, while the ventilation portion 331 of the seat back cover 33 has four through holes 331A to 331D formed therein in the above-mentioned embodiment, the ventilation portion 331 in the modified example of Fig. 6 has two through holes 331E, 331F formed therein. The structure of the modified example other than the above is similar to that of the above-mentioned embodiment, and therefore will not be described here.

[0061] The restricting portions 332A, 332B are provided to restrict movement in the seat width direction of the fan connecting wire harness 51 and the airbag connecting wire harness 52, which are routed outside the ventilation portion 331. Specifically, a plurality of restricting portions 332A, 332B (two in this example) are arranged at intervals in the seat up-down direction on the inner surface of the covering portion 332, and extend in a band shape in the seat width direction. Both end portions in the seat width direction of each restricting portion 332A, 332B are sewn to both side portions in the seat width direction on the inner surface of the covering portion 332.

[0062] Specifically, both end portions in the sheet width direction of the restricting portion 332A located on the lower side when the covering portion 332 is rolled up are arranged along both side portions of a region 332E where the overall width in the sheet width direction of the covering portion 332 changes in the sheet up-down direction. In addition, both end portions in the sheet width direction of the restricting portion 332A are arranged so as to straddle a boundary portion (constricted portion) 332G between the region 332E where the overall width of the covering portion 332 changes and the region 332F where the overall width is constant. Both end portions in the sheet width direction of the restricting portion 332B located on the upper side when the covering portion 332 is rolled up are arranged along both side portions of the region 332F where the overall width in the sheet width direction of the covering portion 332 is constant.

[0063] The connection (sewn) portions between the restricting portions 332A, 332B and the covering portion 332 as described above are disposed at positions offset downward from the ventilation portion 331 in a state in which the covering portion 332 is not rolled up (a state in which it is placed on the front side of the lower part of the seat) as shown by the two-dot chain line in Fig. 6. In other words, the sewing portions of the restricting portions 332A, 332B are disposed so as not to overlap with the ventilation portion 331 in a rear view. Specifically, in the modified example of Fig. 6, the sewing portions of the restricting portions 332A, 332B are disposed at positions offset downward from the through holes 331E, 331F of the ventilation portion 331 in the seat width direction.

[0064] A space capable of inserting the fan-connecting wire harness 51 and the airbag-connecting wire harness 52 is formed between the middle portion of each of the restricting portions 332A, 332B in the seat width direction and the inner surface of the covering portion 332. The width in the seat vertical direction of the restricting portion 332B closer to the connectors 51A, 52A of each wire harness is formed to be narrower than the width in the seat vertical direction of the restricting portion 332A farther from the connectors 51A, 52A.

[0065] The holding portions 332C and 332D are provided on the inner surface of the covering portion 332 to hold the airbag connecting wire harness 52. In the modification of FIG. 6, the two restricting portions 332A and 332B Two holding portions 332C, 332D are provided at an interval in the seat vertical direction for each of them. In other words, the two holding portions 332C, 332D are arranged in the seat vertical direction with the restricting portion 332A therebetween. The number of holding portions is not limited to two, and one or three or more holding portions may be provided on the inner surface of the covering portion 332. Also, if necessary, a holding portion for holding the fan-connecting wire harness 51 may be provided on the inner surface of the covering portion 332.

[0066] Specifically, the holding portions 332C, 332D preferably have elastic properties or flexibility, and can be formed, for example, using a skin material or tape. When the holding portions 332C, 332D are formed from a skin material, sliding of the airbag connecting wire harness 52 is permitted, making it easier to adjust the position of the airbag connecting wire harness 52. On the other hand, when the holding portions 332C, 332D are formed from tape, sliding of the airbag connecting wire harness 52 around the holding portions 332C, 332D can be restricted.

[0067] The connector 51A of the fan-connecting wire harness 51 and the connector 52A of the airbag-connecting wire harness 52 are terminals for electrically connecting the fan-connecting wire harness 51 and the airbag-connecting wire harness 52 to, for example, other wire harnesses connected to the wire connection portion 3 below the seat cushion 12.

[0068] The right through-hole 331E formed in the ventilation portion 331 corresponds to the first through-hole 331A in the above-mentioned embodiment, and is also used as an inlet for the fan-connecting wire harness 51. The left through-hole 331F corresponds to the second through-hole 331B in the above-mentioned embodiment, and is also used as an inlet for the airbag-connecting wire harness 52. The through-holes 331E, 331F are disposed on both sides of the ventilation portion 331 in the seat width direction, and extend in the seat up-down direction. The lower ends of the through-holes 331E, 331F extend to positions overlapping with the lower cross frame 311D (FIGS. 4 and 5) of the seatback frame 31, or below the lower cross frame 311D.

[0069] In the above-described modified example of the vehicle seat 1, the restricting portions 332A and 332B of the covering portion 332 restrict the fan connecting wire harness 51 and the airbag connecting wire harness 52 from moving outward in the seat width direction from the covering portion 332. This makes it possible to reliably suppress exposure of the wire harnesses to the passenger compartment. In particular, both end portions of the restricting portion 332A in the seat width direction are arranged along both sides of the overall width change region 332E of the covering portion 332, which makes it easier to guide the fan connecting wire harness 51 and the airbag connecting wire harness 52 inward in the seat width direction. Furthermore, both end portions of the restricting portion 332A are arranged so as to straddle the narrowed portion 332G of the covering portion 332, which makes it easier to align the fan connecting wire harness 51 and the airbag connecting wire harness 52 with the wiring direction (seat up-down direction) on the inner surface of the covering portion 332. As a result, the effect of suppressing exposure of the wire harnesses is enhanced.

[0070] In addition to the restricting portions 332A and 332B as described above, the holding portions 332C and 332D of the covering portion 332 position the airbag-connecting wire harness 52, so that it is possible to more reliably prevent the airbag-connecting wire harness 52 from being exposed to the vehicle interior. In particular, by providing the holding portion 332D between the two restricting portions 332A and 332B, it is possible to restrict or limit the movement and sliding of the airbag-connecting wire harness 52 relative to the restricting portions 332A and 332B. Since the holding portions 332C and 332D are provided at positions that do not overlap with the restricting portions 332A and 332B, the airbag-connecting wire harness 52 can be easily held by the holding portions 332C and 332D.

[0071] In the modified example of the vehicle seat 1, the through-holes 331E, 331F of the ventilation portion 331 extend to a position overlapping (or below) the lower cross frame 311D, so that the area of ​​the through-holes 331E, 331F is increased, and air can flow more easily. Furthermore, in a state in use where the covering portion 332 is not rolled up, the connection (sewn) portion between the covering portion 332 and the restricting portions 332A, 332B is disposed at a position offset from the through-holes 331E, 331F of the ventilation portion 331 in the seat width direction outside and below the seat, so that the restricting portions 332A, 332B can prevent the air flowing through the through-holes 331E, 331F from being blocked by the restricting portions 332A, 332B, which makes it difficult for the air to flow. In particular, if the restricting portions 332A, 332B of the covering portion 332 are arranged so as not to overlap with the ventilation portion 331, it is possible to reliably prevent the flow of air to the through-holes 331E, 331F from being blocked by the restricting portions 332A, 332B. In other words, the flow of air in the left-right direction near the ventilation portion 331 in FIG. 6 is prevented from being blocked by the restricting portions 332A, 332B of the covering portion 332.

[0072] In addition, since the fan connecting wire harness 51 and the airbag connecting wire harness 52 are each configured to be separable by the connectors 51A, 52A in the middle of the wiring direction, when the covering portion 332 is rolled up, the wire harness separated to the seat back 30 side can be moved together with the covering portion 332. This makes it possible to easily perform the wiring work of the fan connecting wire harness 51 and the airbag connecting wire harness 52 and the opening and closing work of the covering portion 332. In addition, since the width of the restricting portion 332B on the side closer to the connectors 51A, 52A of each wire harness is formed to be narrower than the width of the restricting portion 332A on the far side, the parts of each wire harness on the connectors 51A, 52A side can slide and deform easily, so that the connection work of the connectors 51A, 52A can be easily performed.

[0073] Although the embodiment and its modified examples of the present invention have been described above, the present invention is not limited to the above-mentioned embodiment and modified examples, and various modifications and changes are possible based on the technical concept of the present invention. For example, in the above-mentioned embodiment and modified examples, an example in which the blower fan 34 is disposed on the seat back 30 side has been described, but the seat structure of the present invention can also be applied to a case in which the blower fan 34 is disposed on the seat portion 10 side.

[0074] In the above-described embodiment and modified example, an example has been described in which the fan-connecting wire harness 51 and the airbag-connecting wire harness 52 are disposed between the ventilation portion 331 and the covering portion 332 as flexible seat components, but a seat component other than the wire harness (for example, a part of a cushioning material or an S-shaped spring) may be disposed between the ventilation portion 331 and the covering portion 332. The flexible seat component of the present invention may be a component made of a thin material that is flexible, or may be a component that is not flexible itself but has flexibility by disposing an elastic body or the like around it.

[0075] In addition, in the above-described embodiment and modified example, an example has been shown in which the first and second through holes 331A, 331B are arranged with a gap in the width direction of the sheet, but it is possible to arrange the first and second through holes with a gap in a direction along the surface of the ventilation portion (for example, in the vertical direction of the sheet).

[0076] In addition, in the above-described embodiment and modified example, an example has been described in which the first to fourth through holes 331A to 331D are formed in the ventilation section 331, but the wall surface defining the through holes may be included in a part of the seat cover other than the ventilation section and covered by the covering section.

[0077] In the above-described embodiment and modified example, an example was shown in which the upper end portion of the covering portion 332 was sewn to the seat back cover 33 and could be turned up above the seat, but the covering portion may be configured to be sewn at the side portions in the seat width direction and turned up in the seat width direction, or the covering portion may be sewn at the lower end portion and turned up below the seat. Furthermore, the covering portion may be configured to be removable from the seat cover. In this case, the covering portion is detachably fixed to the seat cover by, for example, a zipper, a hook-and-loop fastener, a button, a clip, or the like. In addition, the covering portion may have breathability like a ventilation portion as long as it has low light transmittance. [Explanation of symbols]

[0078] 1...Vehicle seat 2...Seat rail 3…Wire connection 10... Seat part 11…Seat frame 12…Seat cushion 13…Seat cover 30…Seat back 31…Seat back frame 311…Frame body 311A…Upper cross frame 311B…Left side frame (first side frame) 311C…Right side frame (second side frame) 311D…Lower cross frame (cross frame) 312…Fan fixing bracket 313…Airbag fixing bracket 314A~314C…Routing brackets (brackets) 315...S-shaped spring 32…Seat back cushion (cushioning material) 32A…Main body 32B…Left side cushion part 32C…Right side cushion part 32D…Concave 32E…Ventilation vent 32F…Flow path 33…Seat back cover (seat cover) 331…Ventilation section 331A~331F…through hole 332…Covering part 332A, 332B…Regulation Department 332C, 332D…Holding part 34...Ventilation fan (blower device) 35…Headrest 36…Headrest guide 51... Fan connection wire harness (first cord-like body) 52...Airbag connecting wire harness (second cord-like body) 51A, 52A…Connector 71...Airbag device (seat side device) V1, V2: Ventilation space

Claims

1. A cushioning material that forms the seat surface; A blower for adjusting the air around the seat; A seat cover that covers the cushion material; In a vehicle seat structure comprising: The seat cover is a ventilation part having air permeability, the ventilation part being in communication with the air blowing device and being formed at a position covering a portion of the cushion material other than the seat surface; A covering portion formed at a position covering the ventilation portion from the outer side of the sheet; Including, a flexible seat component is disposed between the ventilation portion and the covering portion, and a ventilation space is formed by the ventilation portion, the covering portion, and the seat component; A vehicle seat structure comprising:

2. The vehicle seat structure according to claim 1, wherein the ventilation portion has a through hole at a position facing the covering portion.

3. 3. The vehicle seat structure according to claim 2, wherein the seat component is disposed between the ventilation portion and the covering portion while being inserted through the through hole, and a gap is formed between the seat component and an edge of the through hole.

4. 4. The vehicle seat structure according to claim 2, wherein the seat component is supported by an edge of the through hole.

5. The vehicle seat structure according to any one of claims 2 to 4, characterized in that the seat component is composed of a cord-like body that connects a seat side device mounted on the air blower device or the vehicle seat to a vehicle body side device provided on the side of the vehicle body on which the vehicle seat is installed, and the cord-like body is arranged through the through hole.

6. A seat frame supporting the cushion material; a bracket provided on the seat frame and supporting the cord-like body; The bracket is disposed at a position facing the covering portion, The vehicle seat structure according to claim 5, wherein the cord-like body has a portion disposed between the bracket and the ventilation portion.

7. The through hole includes a first through hole and a second through hole that are arranged at a distance from each other at a position facing the covering portion, The vehicle seat structure according to claim 6, wherein the bracket is disposed between the first through hole and the second through hole.

8. The first through hole and the second through hole are arranged at an interval in the sheet width direction, 8. The vehicle seat structure according to claim 7, wherein the ventilation space formed by the ventilation portion, the covering portion and the cord-like body communicates with a vehicle interior space at both ends in the seat width direction.

9. The seat frame includes: A cross frame extending in the seat width direction; a first side frame provided at one end side of the cross frame in a longitudinal direction and extending in a transverse direction intersecting with the seat width direction; a second side frame provided on the other end side of the cross frame in the longitudinal direction and extending in the intersecting direction, the first through hole and the second through hole are provided at a position adjacent to the cross frame, The bracket is fixed to the cross frame, The cord-like body is A first cord-like body arranged along the cross frame and the first side frame; a second cord-like body arranged along the cross frame and the second side frame, The first cord-like body is supported by the bracket and is inserted through the first through hole, 9. The vehicle seat structure according to claim 8, wherein the second cord-like body is supported by the bracket and is inserted through the second through hole.

10. the first through hole is disposed closer to the second side frame than the second through hole, the second through hole is disposed closer to the first side frame than the first through hole, The vehicle seat structure according to claim 9, characterized in that the first cord-like body and the second cord-like body are arranged such that the routing direction of the first cord-like body, which is pulled along the cross frame from the first through opening toward the first side frame, is opposite to the routing direction of the second cord-like body, which is pulled along the cross frame from the second through opening toward the second side frame.

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