JP2021008223A - Vehicle seat - Google Patents

Abstract

To secure quick expansion of an airbag and fix a rear surface material to a rear surface of a seat pad securely.SOLUTION: A rear surface material 30 has a connection material 40 which connects general parts 32, 33, located at one side of an expansion allowable part 31 and the other side opposite to the one side, with each other. When an airbag 21 is not expanded, the general parts 32, 33 are located close or adjacent to each other and connected by the connection material 40. Expansion of the airbag 21 releases connection between the general parts 32, 33 by the connection material 40 to expand the expansion allowable part 31.SELECTED DRAWING: Figure 5

Description

The present invention relates to a vehicle seat including a seat pad, a seat frame, a back surface material fixed to the back surface of the seat pad, and an airbag attached to the seat frame.

This type of vehicle seat is formed by arranging foamed resin seat pads on a metal seat frame and covering them with a seat cover. In addition, a surface-shaped back surface material is fixed to the back surface of the seat pad, and by avoiding direct contact between the seat frame and the seat pad, the generation of abnormal noise such as rubbing noise is prevented as much as possible. .. An airbag device with a built-in airbag is attached to the seat frame, and the airbag expands to the seating side of the seat pad in the event of a vehicle collision or the like.

By the way, in the above-mentioned seat configuration, it is desirable to provide a structure that allows the airbag to swell on the back surface material from the viewpoint of ensuring the rapid swelling of the airbag. For example, in the automobile seat disclosed in Patent Document 1, a reinforcing member is attached to the back surface of the cushion pad, and an airbag device is attached to the frame. This reinforcing member is a planar member corresponding to the back surface material of the present invention, and a plurality of notched holes are provided at positions facing the airbag. Each notch hole is a through hole that penetrates the reinforcing member in the thickness direction, and the reinforcing member portion provided with these notch holes corresponds to the swelling allowable portion of the present invention. According to a known technique, when the airbag expands, a part of the reinforcing member (expansion allowance portion) breaks up and down with each notch hole as a base point to expand, thereby ensuring rapid expansion of the airbag. ing. Further, by inflating the airbag from a part of a predetermined reinforcing member (expansion allowable portion), it is possible to regulate the swelling direction of the airbag to be appropriate.

Japanese Patent No. 3358450

Here, in the known technique, a plurality of notch holes are provided in the reinforcing member (back surface material) to ensure rapid swelling of the airbag. However, in such a configuration, since the seat pad may come into direct contact with the seat frame through the notch hole, the configuration tends to be unsuitable for avoiding the generation of abnormal noise and ensuring quietness. The present invention has been devised in view of the above points, and the problem to be solved by the present invention is to fix the back material to the back surface of the seat pad with good performance while ensuring the rapid swelling of the airbag. It is to keep.

As a means for solving the above problems, the vehicle seat of the first invention has a seat pad that can elastically support an occupant and a planar back material fixed to the back surface opposite to the seating surface of the seat pad. A seat frame arranged on the back side of the seat pad and an airbag attached to the seat frame are provided. The back surface material has a general part and a swelling allowance part that allows the airbag to swell, and the inflatable airbag can expand the swelling allowance part and swell to the seating side of the seat pad. is there. In this type of configuration, it is desired to fix the back surface material to the back surface of the seat pad with good performance (for example, while ensuring quietness as much as possible) while ensuring the rapid swelling of the airbag.

Therefore, the back surface material of the present invention has a connecting material that connects the general parts located on one side of the expansion allowable portion and the other side opposite to the expansion allowable portion, and when the airbag is not inflated, the general portions are in close proximity to each other or It is adjacently connected by a connecting material. Then, due to the expansion of the airbag, the connection between the general parts by the connecting material is released, and the swelling allowable part expands. In the present invention, when the airbag is not inflated, the general portions located on both sides of the expansion allowable portion are connected to each other by a connecting material in close proximity to or adjacent to each other. By structurally complementing the swelling allowance portion with the general portion in this way, deterioration of quietness caused by the swelling allowance portion can be avoided as much as possible. Furthermore, when the airbag swells, it is possible to ensure the rapid swelling of the airbag by releasing the connection between the general parts by the connecting material and returning the swelling allowable part to the original state. ..

The vehicle seat of the second invention is the vehicle seat of the first invention, and the seating side of the seat pad is covered with a seat cover formed by suturing a plurality of skin pieces. The swelling allowance portion is a slit or a through hole extending in a predetermined direction, and the connecting material is a suture thread that sews the general portions together so as to close the swelling allowance portion, and sews the seat cover. It is fragile compared to other sutures. In the present invention, the slit-shaped or hole-shaped swelling allowance portion is closed by the suture as a connecting material for connecting the general portions, so that the deterioration of quietness caused by the swelling allowance portion is more reliably avoided. can do. Further, by forming the connecting material for connecting the general parts with a relatively fragile suture, it is possible to more reliably secure the rapid swelling of the airbag.

In the vehicle seat of the third invention, in the vehicle seat of the second invention, the stitches of the sutures forming the connecting material are extended in the extending direction of the swelling allowance portion. In the present invention, by extending the stitches of the sutures forming the connecting material in the extending direction of the swelling allowance portions, the swelling allowance portions can be structurally complemented by the general portions with better performance. That is, since the sutures are stitched and continuously extended, it is possible to complement the swelling allowance portion over a wide range, and it is possible to more reliably avoid the deterioration of quietness caused by the swelling allowance portion. Can be done. Further, in the present invention, the stitches can be extended intermittently to make it easier to relatively expand the space between the stitches, thereby ensuring the rapid swelling of the airbag more reliably. can do.

The vehicle sheet of the fourth invention is the vehicle sheet of the third invention. In stitching, at least one of the first end portion at the beginning of sewing and the second end portion at the end of sewing are thread trimmed without reverse stitching. Has been done. In the present invention, at least one end portion of the stitch is not reverse stitched and is easily pulled out from the general portion. Therefore, when the airbag swells, the connection of the general portion by the connecting material can be smoothly released, and the rapid swelling of the airbag can be more reliably ensured.

According to the first invention according to the present invention, the back surface material can be fixed to the back surface of the seat pad with good performance while ensuring the rapid swelling of the airbag. Further, according to the second invention, the back surface material can be more reliably fixed to the back surface of the seat pad with good performance while ensuring the rapid swelling of the airbag more reliably. Further, according to the third invention, the back surface material can be fixed to the back surface of the seat pad with even better performance. Then, according to the fourth invention, it is possible to more reliably secure the rapid swelling of the airbag.

It is a perspective view of a vehicle seat. It is sectional drawing of a seat back. It is an exploded perspective view of a seat back. It is a front view of the back surface material before attaching a connecting material. It is a schematic front view of a part of the back surface material which shows the swelling allowance part. It is the schematic enlarged front view of a part of the back surface material at the time of attaching a connecting material. It is a schematic front view of a part of the back surface material when the airbag is inflated. It is a schematic enlarged front view of a part of the back surface material when the airbag is inflated.

Hereinafter, embodiments for carrying out the present invention will be described with reference to FIGS. 1 to 8. For convenience, each figure shows arrow lines indicating the front-rear direction, the left-right direction, and the up-down direction of the vehicle seat. The vehicle seat 2 of FIG. 1 has a seat cushion 4, a seat back 6, and a headrest 8. These seat components (4, 6, 8) are the seat frame (4F, 6F, 8F) forming the seat skeleton, and the seat pad (4P, 6P, 4P, 6P, which can elastically support the occupant by forming the outer shape of the seat. It has 8P) and seat covers (4S, 6S, 8S) that form the front of the seat. A lower portion of the seat back 6 (described in detail later) is foldably connected to the rear portion of the seat cushion 4 via a reclining R. A headrest 8 is arranged above the upright seat back 6.

[Seat back]
The seat back 6 shown in FIG. 1 is a member having a substantially rectangular shape in front view, which serves as a backrest of an occupant, and a handle portion 7 is attached to the left shoulder opening thereof. The seat back 6 is formed by arranging the seat pads 6P on the seating side of the seat frame 6F with reference to FIGS. 1 to 3 and further covering them with the seat cover 6S (details of each configuration). Will be described later). Further, in the seat back 6, from the viewpoint of ensuring the quietness of the seat, the back surface material 30 described later is fixed to the back surface 6Pd opposite to the seating surface (front surface) of the seat pad 6P.

Further, as shown in FIGS. 2 and 3, a seat frame 6F to which the airbag device 20 is attached is arranged on the back side of the seat pad 6P. Then, in the event of a vehicle collision or the like, the airbag 21 in the airbag device 20 expands and expands toward the seating side of the seat pad 6P. In this type of seat configuration, the back surface material 30 should be provided with a configuration that allows the airbag 21 to swell (expansion allowable portion 31 described later), but the performance of the back surface material 30 is affected by this structure. Situations that worsen should be avoided as much as possible. Therefore, in this embodiment, the back surface material 30 is fixed to the back surface 6Pd of the seat pad 6P with good performance while ensuring the rapid swelling of the airbag 21 by the configuration (connecting material 40) described later. Hereinafter, each configuration will be described in detail.

[Seat Cover]
The seat cover 6S shown in FIGS. 2 and 3 is a face material constituting the front surface of the seat, and is made of cloth (woven fabric, knitted fabric, non-woven fabric) or leather (natural leather, synthetic leather). The seat cover 6S is formed by suturing a plurality of skin pieces (reference numerals omitted) with the general suture thread Y1 shown in FIG. 2 so as to form a bag shape. As this type of general suture thread Y1, natural fibers are used. Alternatively, a synthetic fiber thread material can be used. Here, the fineness of the general suture Y1 is not particularly limited, but a thread material having an appropriate strength and having a count of 8 or less is used, and a thread material having a count of 5 to 8 is typically used. Then, in this embodiment, the general suture thread Y1 that sews the skin pieces together corresponds to another suture thread that sews the seat cover of the present invention. Further, the suture portion between the skin pieces located on the left side of the seat cover 6S is a fragile portion 6SS that allows the airbag 21 to swell, which will be described later, and the fragile portion 6SS has a force for promoting breakage. A cloth (not shown) can be attached. Then, the force cloth is pulled by the expansion of the airbag 21 and the fragile portion 6SS is broken, so that the airbag 21 bulges from the broken fragile portion 6SS to the seat seating side (front side in each figure). ..

[Sheet frame]
The seat frame 6F shown in FIGS. 2 and 3 is a frame body having an arch shape when viewed from the front, and is made of a metal or a hard resin having excellent rigidity. The seat frame 6F has an upper frame 10 forming an upper skeleton, a right side frame 11 and a left side frame 12 forming a side skeleton, and a lower frame 13 forming a lower skeleton. The side frames 11 and 12 are arranged separately on the right side and the left side of the seat, and have substantially the same basic configuration except that they are symmetrical. For example, the left side frame 12 is a vertically long plate-shaped member, and a reclining R is fitted under the plate-shaped member. The lower frame 13 is a flat plate-shaped member that is bridged and fixed to the lower portions of the left and right side frames 11 and 12.

[Airbag]
Here, the airbag 21 shown in FIGS. 2 and 3 is a bag body that can be expanded by the inflow of air, and is arranged in a substantially cubic airbag device 20. The airbag device 20 is attached to the outer surface of the left side frame 12 in a vertically oriented state via a bracket (not shown). An airbag module (not shown) is disposed together with the airbag 21 inside the airbag device 20, and a cable 22 connected to a power supply or a control unit is extended outside the airbag device 20. ing. A gas supply device is provided in this airbag module, and a gas generator or high-pressure gas is further sealed in the gas supply device. In this embodiment, the airbag module can receive a signal and supply air to the airbag 21 at the time of a vehicle collision. Then, the inflatable airbag 21 can be inflated to the seating side of the seat pad 6P as described later by jumping out of the airbag device 20. The airbag 21 bulges from the left side of the seat back 6 to the seating side and is in a deployed state, so that the body range from the occupant's chest to the occupant's waist can be protected.

[Seat pad]
The seat pad 6P shown in FIGS. 2 and 3 is a member having a substantially rectangular shape when viewed from the front, and is made of a foamed resin such as polyurethane foam (density: 10 kg / m ^{3 to} 60 kg / m ³ ). The seat pad 6P has an appropriate thickness (front and rear dimensions), and the upper trailing edge 6Pa, the right trailing edge 6Pb, and the left trailing edge 6Pc surround the peripheral edge of the seat frame 6F and the airbag device 20. It protrudes backward. Further, on the right side of the back surface 6Pd of the seat pad 6P, the position facing the airbag device 20 is recessed on the seating side, and the thickness dimension of this recessed seat pad portion (recessed portion 6PP) becomes thin and it is easy to break. .. A back surface material 30 described later is fixed to the back surface 6Pd of the seat pad 6P, and the back surface material 30 is arranged at a position facing the seat frame 6F and the airbag device 20.

[Back material]
The back surface material 30 shown in FIGS. 2 to 5 is a planar member fixed to the back surface 6Pd of the seat pad 6P, and is provided to ensure the quietness of the sheet. The back surface material 30 is a face material that follows the shape of the back surface of the seat pad 6P, and includes a swelling allowance portion 31 to be described later and general portions 32, 33 and the like other than the swelling allowance portion 31 provided on the left side thereof. It can be divided into. A hole 7H for attaching the handle 7 is provided on the upper left side of the back surface member 30. Here, as the material of the back surface material 30, a face material that does not easily generate rubbing noise when in contact with the seat frame 6F can be used, and for example, felt or cloth can be used.

[Expandable part]
The swelling allowance portion 31 shown in FIGS. 2 to 5 is a position where the swelling of the airbag 21 is allowed, and is provided at a position facing the airbag device 20 of the back surface material 30. The swelling allowance portion 31 can be formed at a slit-shaped or hole-shaped portion, or a portion that is thinner (weakened) and easily broken as compared with a general portion. For example, in this embodiment, referring to FIG. 4, the swelling allowance portion 31 before attaching the connecting material is formed in an elongated hole shape penetrating the back surface material 30 in the thickness direction to allow the passage of the airbag. It is possible to expand to the left and right. Then, the swelling allowance portion 31 extends in the vertical direction (predetermined direction) according to the shape of the airbag, and extends the right general portion 32 forming the right edge, the left general portion 33 forming the left edge, and the upper and lower edges. It is surrounded by other general parts (signs omitted). The right general portion 32 and the left general portion 33 correspond to general portions located on one side of the swelling allowance portion of the present invention and the other side opposite to each other, and are connected later as shown in FIGS. 2 and 5. It is connected by the material 40. The swelling allowance portion 31 is closed when the airbag 21 is not inflated by connecting the right general portion 32 and the left general portion 33 by a connecting member 40 described later.

[Connecting material]
With reference to FIGS. 5 and 6, the connecting member 40 is a member that connects the right general portion 32 and the left general portion 33 located on both sides of the swelling allowance portion 31, and in this embodiment, the stitch thread Y2 is stitched. It is composed of ST. The stitch ST (described in detail later) of the suture thread Y2 as the connecting member 40 is extended in the vertical direction, which is the extending direction of the swelling allowable portion 31, and the right general portion 32 when the airbag 21 is not inflated. And the left general portion 33 are adjacent to each other and connected. The swelling allowance portion 31 is formed with a pair of upper and lower stitch regions AR1 and AR2 in which the stitch ST as the connecting member 40 is formed, and an intermediate region AR3 in which the connecting member 40 is not arranged. The upper upper suture region AR1 is formed downward from the upper end of the swelling allowance portion 31. Further, an intermediate region AR3 is formed below the upper suture region AR1, and a lower lower suture region AR2 is formed below the intermediate region AR3 up to the lower end of the swelling allowance portion 31. The right general portion 32 and the left general portion 33 of the intermediate region AR3 are not physically connected, but are substantially adjacent to each other due to the influence (tightening force) of the upper and lower suture regions AR1 and AR2.

[Stitch and its edge treatment]
Here, in the upper suture region AR1 and the lower suture region AR2 shown in FIG. 5, a stitch ST of the suture thread Y2 as a connecting member 40 having substantially the same configuration is provided. Therefore, the details of the stitch ST will be described below by taking the upper stitch region AR1 as an example. This stitch ST is formed of a plurality of stitches extending vertically, and the right general portion 32 and the left general portion 33 are sewn so as to close the swelling allowable portion 31. As the stitch ST forming method, various methods capable of connecting the general parts to each other can be adopted, and the general parts can be sewn without overlapping each other, or the general parts can be sewn together. Then, as shown in FIG. 6, the stitch ST is formed between the right general portion 32 and the left general portion 33, and the stitch ST is further tightened in the left-right direction. Due to the tightening force of the stitch ST, the right general portion 32 and the left general portion 33 are connected to each other so as to close the swelling allowance portion 31 (up to the position indicated by the two-dot dashed line in FIG. 6) in a state of being close to each other and adjacent to each other. The Rukoto. Further, in the present embodiment, both the first end portion 41 at the beginning of sewing and the second end portion 42 at the end of sewing of the stitch ST are thread trimmed without reverse stitching. By not performing reverse stitching in this way, it is possible to make it easy for the end side of the suture Y2 of each of the end portions 41 and 42 to come off from the corresponding general portion.

Here, with reference to FIGS. 2 and 6, the fineness of the suture Y2 is not particularly limited as long as the connection between the general portions can be maintained when the airbag is not inflated, but is higher than that of the general suture Y1 of the seat cover 6S. It is desirable to be vulnerable. For example, when the general suture Y1 and the suture Y2 are made of the same material, the suture Y2 can be weakened by making it thinner than the general suture Y1. At this time, by using the suture Y2 having a count of 10 or more (preferably 20 or more) for the stitch ST, the end side of the suture Y2 of each end portion 41, 42 can be easily detached from the corresponding general portion. It is easy to break when the airbag is inflated. It is also possible to form the suture Y2 with a material that is weaker than the general suture Y1, and in this case, the fineness of the suture Y2 can be set independently of the general suture Y1.

[Fixing method of backing material to seat pad]
Here, as a method for fixing the back surface material 30 to the seat pad 6P, an integral molding such as insert molding and a method such as adhesion, fusion, and suturing can be exemplified. For example, the back surface material 30 of this embodiment is integrated by being fixed to the back surface 6Pd at the same time as the seat pad 6P is formed by insert molding after attaching the connecting material 40. At the time of this insert molding, the seat pad 6P is formed by foaming and curing the liquid base material, and the base material is further cured in a state of being appropriately impregnated with the back surface material 30. At this time, since the swelling allowance portion 31 of the back surface material 30 is closed by the connecting material 40, it is possible to prevent the situation where the raw material leaks to the back side of the back surface material 30 through the swelling allowance portion 31 as much as possible. .. Therefore, according to this embodiment, it is possible to avoid a situation in which a part of the seat pad 6P is unintentionally formed on the back side (seat frame side) of the back surface material 30, and to ensure the quietness of the seat. It is structured to contribute. Further, since the swelling allowance portion 31 of the back surface material 30 is closed by the connecting material 40, there is no play caused by the swelling allowance portion 31, and it is easy to set the back surface material (for example, arrangement of the back surface material) at the time of molding. It becomes.

[Action of backside material when airbag is not inflated]
With reference to FIG. 2, the seat pads 6P are arranged on the seating side of the seat frame 6F, and then these are covered with the seat cover 6S. In this embodiment, the back surface material 30 is fixed to the back surface 6Pd of the seat pad 6P, and the back surface material 30 is arranged at a position facing the seat frame 6F from the viewpoint of ensuring the quietness of the seat. In this way, the back surface material 30 avoids the direct contact between the seat frame 6F and the seat pad 6P, thereby preventing the generation of abnormal noise such as rubbing noise caused by the contact between the seat frame 6F and the seat pad 6P as much as possible. Then, in this embodiment, in order to ensure the rapid expansion of the airbag 21, the back surface material 30 is provided with the expansion allowable portion 31 as described above. In this type of seat configuration, the situation where the seat frame 6F and the seat pad 6P are in direct contact with each other due to the swelling allowance portion 31 should be avoided as much as possible.

Therefore, the back surface material 30 of the present embodiment is a connecting material 40 that connects the general portions 32 and 33 located on one side of the swelling allowance portion 31 and the other side opposite to the swelling allowable portion 31 with reference to FIGS. 2 and 5. Have. When the airbag 21 is not inflated, the general portions 32 and 33 are adjacent to each other and are connected by a connecting member 40. That is, in each of the suture regions AR1 and AR2 of the swelling allowance portion 31, the stitch ST of the suture thread Y2 as the connecting material 40 connects the right general portion 32 and the left general portion 33 adjacent to each other. In this way, the swelling allowance portion 31 is closed and structurally complemented by the connecting member 40 that connects the general portions 32 and 33 to each other, so that the seat pad 6P is directly attached to the seat frame 6F through the swelling allowance portion 31. It is possible to avoid situations such as contact as much as possible. In particular, in each of the suture areas AR1 and AR2, the stitch ST is continuously extended to complement the swelling allowance portion 31 over a wide range, thereby more reliably avoiding the deterioration of quietness caused by the swelling allowance portion 31. can do. Further, in this embodiment, as described later, the expansion of the airbag 21 releases the connection between the general portions 32 and 33 by the connecting member 40, and the expansion allowable portion 31 expands. Therefore, the behavior of the swelling allowance portion 31 and the connecting member 40 when the airbag 21 is inflated will be described below.

[Behavior of backing material when airbag is inflated]
When the airbag 21 shown in FIG. 2 is expanded, the airbag 21 is supplied with air from the airbag module and expands to the seating side (front side in FIG. 2). At this time, the stitch ST closing the swelling allowance portion 31 is unwound by receiving the pressure when the airbag 21 is inflated with reference to FIGS. 7 and 8, so that the general portions 32 and 33 are connected to each other. After being released, the swelling allowance portion 31 returns to the original elongated hole shape. Therefore, the airbag 21 can be expanded to the seating side while being expanded to the left and right so as to push the elongated hole-shaped expansion allowance portion 31. In particular, in this embodiment, the stitch ST as the connecting member 40 is intermittently formed, and the intermediate region AR3 is provided between the upper and lower stitch regions AR1 and AR2. Therefore, the airbag 21 can expand and expand the swelling allowance portion 31 with the intermediate region AR3 as a base point. Further, in each of the stitch areas AR1 and AR2, the suture thread Y2 is relatively fragile, and the ends 41 and 42 of the corresponding stitch ST are not reverse stitched and are easily pulled out. Therefore, in the suture regions AR1 and AR2, the sutures Y2 of the ends 41 and 42 of the stitch ST may come off from the corresponding general portions 32 and 33 due to the pressure when the airbag 21 is expanded, or the sutures Y2 may be unwound. It may break in the middle. Therefore, the suture regions AR1 and AR2 can also be gradually and smoothly expanded in the left-right direction following the intermediate region AR3.

Thus, in this embodiment, when the airbag 21 swells, as shown in FIGS. 7 and 8, the general portions 32 and 33 are disconnected from each other by the connecting member 40, and the swelling allowable portion 31 is in the original state. By returning to, the rapid swelling of the airbag 21 can be ensured. Further, by inflating the airbag 21 from the swelling allowance portion 31, the swelling direction of the airbag 21 can be regulated to be appropriate. Then, referring to FIG. 2, the airbag 21 that has passed through the swelling allowance portion 31 further expands while breaking the recessed portion 6PP of the seat pad 6P and the fragile portion 6SS of the seat cover 6S, and swells toward the seat seating side. It will be put out and deployed.

As described above, in the present embodiment, when the airbag 21 is not inflated, the general portions 32 and 33 located on both sides of the swelling allowable portion 31 are adjacent to each other and are connected by the connecting member 40. By structurally complementing the swelling allowance portion 31 with the general portion in this way, it is possible to avoid the deterioration of quietness caused by the swelling allowance portion 31 as much as possible. Further, when the airbag 21 swells, the general portions 32 and 33 are disconnected from each other by the connecting material 40 and the swelling allowable portion 31 is returned to the original state, so that the airbag 21 can be rapidly bulged. It becomes possible to secure. Further, in the present embodiment, the hole-shaped swelling allowance portion 31 is closed by the suture thread Y2 as the connecting member 40 that connects the general portions 32 and 33 to each other, so that the swelling allowance portion 31 causes quietness. Deterioration can be avoided more reliably. Further, by forming the connecting member 40 that connects the general portions 32 and 33 with the relatively fragile suture thread Y2, it is possible to more reliably secure the rapid swelling of the airbag 21. Further, in this embodiment, the suture thread Y2 stitch ST forming the connecting material 40 is extended in the extending direction of the swelling allowance portion 31, so that the swelling allowance portion 31 is structurally formed by the general portions 32 and 33. It can be complemented with better performance. That is, since the suture thread Y2 is continuously extended by forming a stitch ST, the swelling allowance portion 31 can be complemented over a wide range, and the deterioration of quietness caused by the swelling allowance portion 31 is more reliable. Can be avoided. Further, in the present embodiment, the stitch STs can be intermittently extended so that the stitch STs can be relatively easily expanded (the intermediate region AR3 is formed), and the airbag 21 can be formed. It is possible to more reliably secure the rapid swelling of. In this embodiment, the ends 41 and 42 of the stitch ST are not reverse stitched and are easily pulled out from the general portions 32 and 33. Therefore, when the airbag 21 swells, the connection of the general portions 32 and 33 by the connecting material 40 can be smoothly released, and the rapid swelling of the airbag 21 can be more reliably ensured. Become. Therefore, according to this embodiment, the back surface material 30 can be fixed to the back surface 6Pd of the seat pad 6P with good performance while ensuring the rapid swelling of the airbag 21.

The vehicle seat 2 of the present embodiment is not limited to the above-described embodiment, and various other embodiments may be adopted. In the present embodiment, the elongated hole-shaped swelling allowance portion 31 is illustrated, but it is not intended to limit the configuration (shape, dimensions, arrangement position, number of formations, etc.) of the swelling allowance portion. For example, a plurality of holes (through holes) may be provided at appropriate intervals above and below, and the back surface material portion connecting the holes may be used as a swelling allowable portion. Further, the swelling allowance portion can be formed of slits (cuts) formed continuously or intermittently, whereby the general portions can be more reliably arranged adjacent to each other via the connecting material. Is possible. Further, the swelling allowance portion can be formed by a portion formed by partially thinning the back surface material. For example, the thin portion may be continuously formed in a groove shape, and has a hole shape (non-penetrating hole). Can also be arranged and formed intermittently.

Further, in the present embodiment, the configuration of the connecting member 40 is illustrated, but the purpose is not to limit the configuration of the connecting member. For example, the connecting material may be configured to connect the general parts in close proximity to each other as long as quietness can be ensured. In addition to the suture, the connecting material can be made of a strip-shaped tape material, staples, or a ring material (C ring or the like). Further, a part of the general part can be fused and connected to another general part, and in this case, a part of the general part serves as a connecting material. Further, when the connecting material is composed of sutures, the general portions may be sutured with loop-shaped sutures, and the loop-shaped sutures may be provided intermittently in the swelling allowance portion. Further, a plurality or a single sutured region can be formed in the swelling allowable portion, and a stitch of the suture thread as a connecting material can be formed over a substantially entire length of the swelling allowable portion. If the airbag can be bulged, reverse stitching can also be applied to at least one end of the stitch.

Further, in the present embodiment, the seat back 6 has been described as an example, but the configuration of the present embodiment can be applied to other seat constituent members such as a seat cushion. Further, the configurations of the seat frame, the seat pad and the seat cover can be appropriately changed according to the seat constituent members to be applied. The configuration of the present embodiment can be applied to all vehicle seats such as vehicles, aircraft, trains, and ships.

2 Vehicle seat 4 Seat cushion 6 Seat back 7 Handle part 8 Headrest 6S Seat cover 6SS Vulnerable part 6F Seat frame 10 Upper frame 11 Right side frame 12 Left side frame 13 Lower frame 6P Seat pad 6Pa Upper trailing edge 6Pb Right Trailing edge 6Pc Left trailing edge 6Pd Backside 6PP Recessed part 20 Airbag device 21 Airbag 22 Cable 30 Backside material 7H Hole 31 Swelling allowance 32 Right general part 33 Left general part 40 Connecting material 41 First end 42 Second End AR1 Upper suture area AR2 Lower suture area AR3 Intermediate area ST Stitch Y1 General suture Y2 Suture R Recliner

Claims (4)

A seat pad that can elastically support an occupant, a planar back material fixed to the back surface opposite to the seating surface of the seat pad, a seat frame arranged on the back side of the seat pad, and the seat frame. Equipped with an airbag attached to
The back surface material has a general portion and a swelling allowable portion that allows the airbag to swell, and the expanding airbag expands the swelling allowable portion to the seating side of the seat pad. In a vehicle seat that can swell
The back surface material has a connecting material that connects general parts located on one side of the swelling allowance portion and the other side opposite to the swelling allowable portion, and when the airbag is not inflated, the general parts are in close proximity to each other or Adjacent to each other, they are connected by the connecting material.
A vehicle seat having a structure in which the connection between the general parts by the connecting material is released by the expansion of the airbag and the swelling allowable part expands. The seating side of the seat pad is covered with a seat cover formed by suturing a plurality of skin pieces.
The swelling allowance portion is a slit or a through hole extending in a predetermined direction, and the connecting material is a suture thread in which the general portions are sewn together so as to close the swelling allowance portion, and the sheet. The vehicle seat according to claim 1, which is fragile as compared with other sutures for suturing a cover. The vehicle seat according to claim 2, wherein the stitches of the sutures forming the connecting material are extended in the extending direction of the swelling allowance portion. The vehicle sheet according to claim 3, wherein in the stitch, at least one of the first end portion at the beginning of sewing and the second end portion at the end of sewing are thread trimmed without performing reverse stitching.

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