JPH11129849A - Seat for vehicle provided with air bag device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To pay attention to a belt cloth provided in a surface side of a side surface cover part as a mounting display of an air bag device, instantaneously concentrate an inflating pressure of an air bag to a burst part of a trim cover, and provide a constitution so as to quickly cut out from a local part in a seam serving as the burst part of the trim cover. SOLUTION: Between a seam 2c serving as a burst part 3 of a trim cover 2 as a mounting display of an air bag device and the end of a side surface cover part 2b stopped in a seat back frame side, a belt cloth 7 of small elongation is stretched, to be equipped in a surface side of the side surface cover part 2b matched with a mounting position of the air bag device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides an airbag device having an airbag which can be inflated and deployed outward by an output pressure generated from an inflator, and the airbag device is provided on one side of a seat back frame. An airbag device that forms a break portion of the trim cover as the airbag inflates and deploys from a seam obtained by sewing the terminals of the front cover portion and the side cover portion of the trim cover that encloses the equipment side of the airbag device. The present invention relates to an improvement of a vehicle seat provided with:

[0002]

2. Description of the Related Art Conventionally, in a vehicle seat provided with an air bag device, a general cover portion of a trim cover is sewn from a sewing thread having a generally used strength, and a front cover of a trim cover which covers an equipment side of the air bag device. It has been proposed to sew the end between the end portion and the side cover portion from a relatively weak sewing thread, and to form a break portion that is opened by the inflation pressure of the airbag by the output of the inflator from the seam formed by the weak sewing thread. (JP-A-8-216820).

[0003] However, the broken portion of the trim cover must be sewn with a sewing thread which is strong enough to withstand normal usability, even though the thread is easily cut by the inflation pressure of the airbag. In addition, since the trim cover is stretched at least in terms of material as the air bag is inflated and deployed, the stress caused by the expansion of the air bag cannot be instantaneously concentrated on the broken portion of the trim cover. In particular, if the output of the inflator is set low so that the airbag is soft and inflated and deployed in a soft manner, it is difficult to effectively incise the broken portion of the trim cover.

[0004] Focusing on the inflation pressure of the air bag to concentrate on the seam that becomes the break portion of the trim cover to create a trigger for incision, one end is sewn together with the seam that becomes the break portion of the trim cover, and By connecting the terminal to the lid of the airbag case or the side plate for installing the airbag device, or by sewing together the terminal seam of the side cover and the rear cover of the trim cover, a power cloth with little elongation can be obtained. A vehicle seat stretched and arranged inside a trim cover has been proposed (JP-A-9-71204).
JP-A-9-71205, JP-A-9-123860
issue).

[0005]

SUMMARY OF THE INVENTION The present invention focuses on a band cloth provided on the front side of a side cover portion for indicating the equipment of an air bag device, and instantaneously applies an inflation pressure of the air bag to a broken portion of the trim cover. It is an object of the present invention to provide a vehicle seat provided with an airbag device configured to concentrate and quickly cut out from a local portion of a seam serving as a break portion of a trim cover.

[0006]

SUMMARY OF THE INVENTION In a vehicle seat provided with an airbag device according to the present invention, a seam serving as a break portion of a trim cover is fixed to a seatback frame side for indicating the equipment of the airbag device. It is configured by bridging between the terminal of the side cover portion and a belt cloth with a small expansion in accordance with the installation position of the airbag device, on the front side of the side cover portion.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the accompanying drawings, FIG. 1 shows an assistant seat for accommodating and equipping an airbag device 1 in a vertical direction on a right side of a seat back B when viewed from the front side of a vehicle. In this assistant seat, a front cover portion (in the case of a bucket seat, a back pad bank portion) is formed such that a break portion 3 accompanying the inflation and deployment of the air bag in the trim cover 2 of the seat back B covers the equipment side of the air bag device 1. A seam 2c is formed by sewing the ends of the cover portion 2a and the side cover portion 2b.

The airbag device 1 is provided with an inflator (not shown), an airbag module including an airbag, and an impact sensor mounted on the vehicle body. The airbag device 1 is provided with an airbag case 1a, as shown in FIG. 2, in which an airbag and an inflator are housed, and a lid 1b that can be pressed and opened by the inflation pressure of the airbag is hinged to the airbag case 1a. The seat back frame 4 is mounted on the side plate 4a of the seat back frame 4.

In place of the air bag device housed in the case, an air bag module including an inflator and an air bag is directly attached to the side plate 4a of the seat back frame 4, and the air bag is attached to the opening 5a of the back pad 5. It can be installed and installed so that it can expand and deploy outward.

The trim cover 2 can be formed using a single material such as genuine leather, synthetic leather, fabric, or the like, or a wading cover in which a skin material, a wading material, and a backing material are integrally laminated. The trim cover 2 corresponds to a seat back B having a bank portion, and a front cover portion 2a covering the left and right bank surfaces from the center of the seat surface and a side cover portion 2b extending from the peripheral side surface to the rear surface are sewn together. As shown, when the back cover 6 is provided, it is sewn in a bag shape with an open back. In the case of the back cover-less type, the ends of the side cover portion and the back cover portion are sewn together to sew as a bag-shaped trim cover having a lower side opened.

The trim cover 2 can be sewn in a predetermined bag shape by sewing the entire thread with a thread number of about 8 which can withstand normal usability as upper and lower sewing threads. In the general section, a thread having a count of about 8 is sewn as upper and lower sewing threads, and a seam 2c serving as a break portion 3 of the trim cover 2 is made of a thread having a count of about 8 and a thread having a count of about 20. By sewing as a sewing thread, it is possible to sew easily while maintaining strength enough to withstand normal usability. This break portion 3 cuts the sewing thread of the seam 2c by the stress due to the inflation of the airbag, or cuts the seam of the seam 2c.
It can be formed to be incisable by allowing the seam allowance c to be unraveled with a sewing thread.

As shown in FIG. 2, the trim cover 2 has a seam 2c serving as a break portion 3 of the trim cover 2 and a terminal of a side cover 2b fixed to a retainer 4b of the seat back frame 4 by a wire 4c. A belt cloth 7 is provided for displaying the equipment of the airbag device. The band cloth 7 is made of a polyester non-woven fabric, cotton cloth, or the like that does not easily expand even under the inflation pressure of the air bag, and is sewn to the surface side of the side cover 2b in accordance with the equipment position of the air bag device.

As shown in FIG. 3, the upper and lower skin materials forming the side cover portion 2b of the trim cover 2 are separately cut to form the band cloth 7, and the band cloth 7 is extended with the surface band material 7a formed from the same skin material as the skin material. It can be sewn between the ends of the skin material forming the side cover portion 2b of the trim cover 2 by superimposing the backing material 7b such as a polyester nonwoven fabric or a cotton cloth of a material having a small amount. Further, as shown in FIG. 4, a belt such as a polyester non-woven fabric or a cotton cloth of a material having low elongation can be provided as the belt cloth 7 by sewing the belt as it is on the surface side of the side cover 2b.

In the vehicle seat constructed as described above, when an impact sensor mounted on the vehicle body operates and an output signal is transmitted from the impact sensor to the inflator, the airbag receives the output pressure of the inflator and inflates. expand. Along with this, the band cloth 7 is located in the inflation and deployment region of the airbag, and is pressed and pulled from the inside by the inflation pressure of the airbag. At that time, since the band cloth 7 does not stretch even when it receives the inflation pressure of the airbag, it acts to stretch, so that the stress due to the inflation of the airbag can be instantaneously concentrated on the seam 2 c which becomes the break portion 3 of the trim cover 2. it can.

Further, the band cloth 7 is provided at the broken portion 3 of the trim cover 2.
In order to concentrate the stress caused by the inflation of the air bag on the local portion of the seam 2c, the local portion of the seam 2c serving as the break portion 3 is strongly pulled by the band cloth 7 and quickly cut out. The bag continuously extends in the length direction along the seam 2c required for inflating and deploying the bag. Thereby, even if the output of the inflator is set low, the stitches 2c necessary for inflation and deployment of the airbag can be quickly and reliably opened.

The band cloth 7 includes a trim cover 2 for each terminal.
Sewn together with the seam 2c forming the break portion 3 of the above, and sewn in the same manner as described above, so as to be provided on the front surface side so as to cover both the front cover portion 2a and the side cover portion 2b. When the trim cover 2 is provided on both sides, the front cover 2a may be provided on the inside as a webbing 8 as shown in FIG. As the webbing 8, a webbing or a web having a substantially trapezoidal area, like the webbing 7, can be used.

As shown in FIG. 6, the webbing 8 is connected to the cushion spring 10 by means of a hanging wire 9 from a hanging hole 5 b of the back pad 5 together with a seat hanging portion 2 d of the trim cover 2. The front cover 2a can be pulled and fastened.
Can be stretched inside. In the case of using a material having a substantially trapezoidal area, the terminal on the short side corresponds to the local part of the seam 2c required for inflating and deploying the airbag, that is, the substantially central position in the vertical direction of the airbag case 1a or the airbag. What is necessary is just to position and sew together, and to hang and fix the terminal on the long side as described above.

When both the band cloth 7 and the web cloth 8 are provided, even if they are inflated under the inflation pressure of the airbag, they do not elongate, so that they are in tension with each other, and the stress caused by the inflation of the airbag is reduced. Seam 2 which becomes break part 3
c can be further concentrated. For this reason, the seam 2c serving as the break portion 3 is rapidly pulled out by the power cloths 7, 8 at a local portion where the short sides of the bandage cloth 7 and the power cloth 8 are sewn together, and is cut out quickly. By continuously extending in the length direction along the seam 2c required for inflation and deployment, the seam 2c required for inflation and deployment of the airbag can be more quickly and reliably incised.

The bank of the back pad 5 is a band cloth 7.
In addition, the back pad 5 has a shape-retaining property that can withstand the tension of the webbing 8, but the back pad 5 may be formed to have a high hardness so as to reliably prevent the bank of the back pad 5 from being compressed and deformed. it can.

[0020]

As described above, according to the vehicle seat provided with the airbag device according to the present invention, the seam serving as the break portion of the trim cover and the seatback frame are fixed to the seatback frame side for indicating the equipment of the airbag device. The airbag inflation pressure is applied to the side of the side cover, and the inflating pressure of the airbag is applied to the trim cover in order to install a low-stretch bandage on the front side of the side cover in accordance with the equipment position of the airbag device. By being instantaneously concentrated on the seam to be pulled and strongly pulled, the seam serving as a break portion of the trim cover can be quickly and reliably incised.

[Brief description of the drawings]

FIG. 1 is a perspective view generally showing a vehicle seat including an airbag device according to the present invention.

FIG. 2 is a partially enlarged sectional view showing a seat back of the vehicle seat.

FIG. 3 is a partially enlarged cross-sectional view showing a mounting position of a belt cloth in the vehicle seat of FIG. 1;

FIG. 4 is a partially enlarged cross-sectional view illustrating a mounting portion of a bandage according to another embodiment different from the bandage of FIG. 3;

FIG. 5 is an overall perspective view showing a vehicle seat including a webbing together with the bandage of FIG. 1;

FIG. 6 is a partially enlarged sectional view showing a seat back of the vehicle seat of FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Air bag apparatus 2 Trim cover 2a Front cover part of trim cover 2b Side cover part of trim cover 2c Seam which becomes break part 3 Break part of trim cover 4 Seat back frame 5 Back pad 7 Obi

Claims (1)

[Claims] 1. An air bag device having an air bag which can be inflated and deployed outward by an output pressure generated from an inflator, and the air bag device is provided on one side of a seat back frame. In a vehicle seat including an airbag device that forms a break portion of the trim cover due to the inflation and deployment of the airbag from a seam obtained by sewing the terminals of the front cover portion and the side cover portion of the trim cover that encloses the equipment side of the device. The airbag device is installed between the seam that is the breakage of the trim cover and the end of the side cover that is fastened to the seat back frame side to display the airbag device. A vehicle equipped with an airbag device, which is provided on the front side of a side cover according to a position. Sheet.