JPH0971204A - Vehicle seat provided with air bag device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable an air bag to be easily opened to break at the sewed part of a seat cover and to be expanded sideways. SOLUTION: A belt hooking part 9 is provided on the side where the air bag device 1 of a seat back frame 4 is buried so that a seat cover 5 for covering the seat back frame 4 may be broken by means of the developing pressure of an expanding air bag. On the other hand, the seat cover 5, is sewed with a seat surface coating part 5a, a framework coating part 5b and a seat back surface coating part 5c together along the front and rear sewed parts 7a, 7b and the front end of a band-like body 10 is sewed together with its front sewed part 7a on the inside of the framework coating part 5b on the side facing to the belt hooking part 9 and the rear end is sewed together with the rear sewed part 7b stronger than the front side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seat provided with an airbag device for protecting an occupant against a side collision.

[0002]

2. Description of the Related Art An air bag device is a device for inflating an air bag to restrain an occupant in a vehicle collision, generally an inflator which is a gas generator, an air bag which is inflated by gas of the inflator, and these air bags. And an airbag case for storing the inflator,
Such an airbag device is not limited to one that restrains an occupant from the front, and in recent years, as disclosed in Japanese Patent Laid-Open No. 6-64491, a seat that covers a seat back in which the airbag device is embedded on the side surface on the door side. Of the cover, in the vicinity of the airbag case opening, the seam covering portion that covers the airbag case opening and the seat surface covering portion are ruptured at a predetermined deployment pressure of the airbag by rupturing the sewn portion, A device has been developed that protects an occupant from a side collision by inflating an airbag from a cracked opening.

However, conventionally, the seat cover material has a low strength so that the sewn portion between the gusset covering portion and the seat surface covering portion of the seat cover is torn between the perforations of the seat cover, that is, when the seat cover material itself is broken. Since it is made of a material, there is a problem that the durability of the seat cover itself cannot be guaranteed and the deployment locus of the airbag is not stable because the breaking points are not constant. In addition, there is a constraint that the strength of the sewing thread must be stronger than the strength between the perforations of the seat cover material, and a high balance between the seat cover material and the sewing thread is required in terms of quality and technology, resulting in poor productivity. There is also a problem that the responsiveness is poor because the seat cover material itself breaks.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art and does not break the conventional seat cover material itself, but instead of the gusset covering portion and the seat surface covering portion of the seat cover. The sewing thread that is sewn on the airbag can be reliably and quickly ruptured at a predetermined deployment pressure to easily tear the sewn portion, and the rupture point is always constant to stabilize the deployment path of the airbag. In addition, the strength of the seat cover material and the sewing thread can be easily balanced, productivity can be greatly improved, and the durability of the seat can be guaranteed for a long period of time. The present invention has been completed for the purpose of providing a vehicle seat equipped with a bag device.

[0005]

A vehicle seat equipped with an airbag device of the present invention, which has been made to solve the above-mentioned problems, has a seat cover covered by a seat back frame embedded in a side surface of the seat back frame. In a vehicle seat equipped with an airbag device in which an occupant is restrained by an airbag that ruptures and laterally inflates due to the deployment pressure of the airbag that inflates when the inflator of the airbag device operates, a seat back frame While the belt hooking portion is provided on the side where the airbag device is embedded, the seat cover is sewn at the front and back stitching portions of the seat surface covering portion, the machi cover portion and the seat back surface covering portion,
A belt-shaped body is sewn on the inside of the gusset covering portion on the side corresponding to the airbag device, the front end of which is sewn together with the front stitching portion, and the rear end of which is sewn on the rear stitching portion more strongly than the front portion. The sewn cover of the seat cover, the intermediate portion of the belt-like body of the seat cover covered by the seat back frame is hooked on the belt hooking portion, and the deployment pressure of the airbag is concentrated on the front stitching portion when the inflator is activated. The feature is that the seat cover is quickly cleaved from this portion.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes an airbag device. The airbag device 1 includes an inflator (not shown) and an airbag 2 housed in an airbag case 3. As shown in FIGS. 1 and 2, a vehicle seat back is shown. Although it is buried in the side wall of the frame 4 and is normally covered by the seat cover 5 which is covered by the seat back frame 4, in an emergency, the airbag 2 is provided between the occupant and the passenger compartment wall by the operation of the inflator. It swells from the opening of the case 3 and breaks the seat cover 5 to deploy the airbag 2, which is basically the same as a conventional airbag device that protects an occupant from a side collision. Are the same.

Seat cover 5 used in the present invention
Sew the sheet surface covering portion 5a and the gusset covering portion 5b at the front sewn portion 7a, and
b is a bag-shaped sewing cover in which the seat back covering portion 5c is sewn at the rear sewn portion 7b, and the breakage of the seat cover 5 due to the deployment pressure of the airbag 2 may be due to a partial breakage of the seat cover material itself. Without the sheet surface coating part 5
The sewing thread 8a of the sewn portion 7a between the a and the gusseted covering portion 5b is broken by the predetermined deployment pressure of the airbag 2, and the sewn portion 7a
The air bag 2 is inflated and deployed by cleaving a.

On the inner surface of the bag-shaped seat cover 5, the front end is covered with the seat surface so that the belt-like body 10 is stretched over the front and rear edges of the gusset covering portion 5b in the vicinity of the portion covering the airbag device 1. Portion 5a and gusseted coating portion 5
2b is sewn together with a sewing thread 8a, and the rear end also has a sewn portion 7b between the gusseted covering portion 5b and the seat back surface covering portion 5c.
The sewn portion 8a is integrally sewn with the sewing thread 8b so that the seat surface covering portion 5a is stretched when the airbag 2 is deployed. In addition, the deployment pressure of the airbag is concentrated on the front sewn portion 7a to break the sewing thread of the sewn portion 7a.
Is designed to be quickly cleaved.

As described above, the band-shaped body 10 must be sewn together so that the rear end is less likely to be cut than the front end.
Therefore, as shown in FIG. 1, the belt-shaped bodies 10 and 10 are bent forward in a V-shape with the sewn portion 7a between the gusseted covering portion 5b and the sheet surface covering portion 5a as the apex. The sewn portion 7a is arranged so as not to be perpendicular to the sewing line but at an angle, and the deployment pressure of the airbag is a V-shaped apex, that is, the gusset covering portion 5b and the seat surface covering portion 5a.
It is configured to concentrate on the sutured portion 7a. Further, as shown in FIG. 3, the strip 10 is arranged diagonally downward with respect to the sewing line of the stitched portion 7a, and the strip 10 is formed.
The stitching width 7 at the front end, which becomes the stitching portion 7a between the sheet surface covering portion 5a and the belt-shaped body 10 and the seat back surface covering portion 5c
If the width is smaller than the stitching width of the rear end that is b, the deployment pressure of the airbag is more likely to be concentrated on the stitching portion 7a between the gusseted covering portion 5b and the seat surface covering portion 5a, which is preferable.

On the other hand, a belt hooking portion 9 is provided on the side surface of the seat back frame 4 in which the airbag device 1 is embedded, and the seat cover 5 is attached to the seat back frame 4.
When the belt-shaped body 10 is covered with the belt-shaped body 10, the intermediate portion of the belt-shaped body 10 can be hooked on the belt-shaped body hooking portion 9, and even if the seat cover 5 is misaligned with the sewing or the seam due to the cover ring, The belt-shaped body 1 with the middle being hooked on the hook 9
In the first half of 0, the predetermined tension is maintained and the deployment pressure of the airbag is the stitched portion 7 between the gusseted covering portion 5b and the seat surface covering portion 5a.
The front sutured portion 7a is surely torn by concentrating on a, so that a stable airbag deployment locus can be guaranteed.

The strip 10 is made of a cloth such as nylon or polyester so that its elongation is minimized.
It is appropriate that the width is about 20 to 30 mm.
The width of the airbag 2 is preferably about 150 to 400 mm if the airbag is guided until all of the belts are broken, but the narrower the width of the strip 10 is, the easier it is to concentrate the deployment pressure of the airbag 2 on the stitched portion 7a. . The band-shaped body 10 may be made of synthetic resin or metal outside the cloth, but in this case, the hardness remains as the feel of the sheet.

In the thus-constructed one, as shown in FIG. 4, when the airbag 2 is inflated, the deployment pressure of the airbag 2 first presses the gusseted covering portion 5b. At this time, the airbag 2 is deployed. The sewn portion 7a of the gusseted covering portion 5b and the seat surface covering portion 5a positioned in the direction is the sewing thread 8a.
Since the seat surface covering portion 5a is restrained from being stretched by the belt-shaped body 10, the airbag 2 is sewn together.
The force due to the pressing of is concentrated on the stitched portion 7a with the band-shaped body 10,
Particularly, when the band-shaped body 10 is arranged obliquely to the sewing line of the stitched portion 7a, the developing pressure is concentrated on the apex thereof, and as a result, the sewing thread 8a surely starts to be cut from this portion and the seat cover. 5 of the sheet surface covering portion 5a and the gusset covering portion 5b, the sewing thread of the stitching portion 7a is cut to form the stitching portion 7
It will be easily cleaved from a.

The belt hooking portion 9 is located in the middle of the belt-shaped body 10.
Since it has been hung on the seat cover 5
Even if there is a sewing deviation or the like, the first half of the belt-shaped body 10 always maintains a predetermined degree of tension, so that the deployment pressure of the airbag concentrates on the sewn portion 7a between the gusset covering portion 5b and the seat surface covering portion 5a. As a result, the front sutured portion 7a is surely torn, and a stable airbag deployment trajectory can be guaranteed. Further, since the band-shaped body 10 is stretched inside the seat cover 5 in such a manner that its front and rear ends are sewn together with the sewn portions 7a and 7b, only the front end of the band-shaped body 10 is sewn to the sewn portion 7a. There is an advantage that the work of covering the seat cover 5 with the seat back 4 can be performed very easily as compared with the case of fixing the rear end to the seat back or the like when sewing and covering the seat cover 5.

[0014]

As is apparent from the above description, the present invention does not rupture the conventional skin material itself, but uses the skin material covering the opening of the airbag case and the skin material covering the seat surface. By adopting a new structure that creates a trigger for the breaking of the sewing thread to be sewn, the sewing thread can be reliably and quickly broken at a predetermined deployment pressure of the airbag to easily tear the suture portion, and The location of the airbag can be made constant at all times to stabilize the deployment trajectory of the airbag, and the balance between the strength of the covering material and the sewing thread can be easily balanced to greatly improve productivity. The durability can also be guaranteed for a long period of time. Therefore, the present invention has an extremely great contribution to the industrial development as a vehicle seat equipped with an airbag device that protects an occupant from a side collision that eliminates the conventional problems.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing a main part of an embodiment of the present invention.

FIG. 2 is an overall perspective view showing an embodiment of the present invention.

FIG. 3 is a partially cutaway perspective view showing a main part of another embodiment of the present invention.

FIG. 4 is an explanatory diagram showing an operating state of the airbag device.

[Explanation of symbols]

 1 Airbag device 2 Airbag 4 Seat back frame 5 Seat cover 5a Seat surface covering part 5b Kamachi covering part 5c Seat back covering part 7a Front stitching part 7b Rear stitching part 9 Belt hooking part 10 Band

Claims (3)

[Claims] 1. An airbag (2) which is inflated by actuation of an inflator of an airbag device (1) in which a seat cover (5) covered by a seatback frame (4) is embedded in a side surface of the seatback frame (4). In a vehicle seat equipped with an airbag device in which an occupant is restrained by an airbag (2) that ruptures and bulges laterally due to the deployment pressure of (1), the airbag device (1) of the seat back frame (4) is ) Is provided on the side where the belt is hooked (9), while the seat cover (5) has a seat surface covering part (5a) and a gusset covering part (5b).
And the seat back surface covering portion (5c) are sewn together at the front and rear stitching portions (7a) and (7b), and the belt-shaped body (inside the belt-shaped body (5b) on the side corresponding to the airbag device (1) ( 10) is sewn together with the front end to the front suture part (7a) and the rear end is the rear suture part.
(7b) is a sewing cover with a belt-like body that is strongly sewn together from the front, and the intermediate portion of the belt-like body (10) of the seat cover (5) covered by the seat back frame (4) is the belt hooking portion.
(9) Hook it to the front seam when the inflator is activated.
A vehicle seat equipped with an airbag device characterized in that the deployment pressure of the airbag (2) is concentrated on (7a) so that the seat cover (5) is quickly cleaved from this portion. 2. The airbag device according to claim 1, wherein the belt-like body (10) is attached to the inside of the seat cover (5) so as to be oblique to the sewing line of the front stitching portion (7a). Vehicle seats equipped. 3. The airbag device according to claim 1, wherein the band-shaped body (10) is attached to the inside of the seat cover (5) so that the stitching width at the front end is smaller than the stitching width at the rear end. A vehicle seat.