JP3777526B2 - Vehicle seat equipped with an air bag device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention includes an airbag device having an airbag that can be inflated and deployed outward with an output pressure generated from an inflator, and the airbag device is provided on one side of a seatback frame, and the airbag device. This invention relates to an improvement in a vehicle seat equipped with an airbag device that forms a fractured portion of a trim cover accompanying the inflation and deployment of an airbag from a seam obtained by stitching together the front and side terminals of the trim cover that encloses the equipment side It is.
[0002]
[Prior art]
Conventionally, in a vehicle seat equipped with an air bag device, in addition to sewing the general portion of the trim cover from a sewing thread having a strength that is normally used, the front side and the side surface of the trim cover enveloping the equipment side of the air bag device are provided. It has been proposed to sew the terminals from a relatively weak sewing thread and form a breakage portion that is incised by the inflation pressure of the air bag generated by the output of the inflator from the seam of the weak strength sewing thread (JP-A-8-216820). issue).
[0003]
However, the broken portion of the trim cover must be sewn with a sewing thread that is strong enough to withstand normal usability even though it is a thread that can be easily cut by the inflation pressure of the airbag. Further, since the trim cover is pulled and stretched at least in material as the airbag is inflated and deployed, the stress due to the inflation of the airbag 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 softly inflated and deployed, it is difficult to effectively incise the broken portion of the trim cover.
[0004]
Focusing on concentrating the inflation pressure of the airbag at the seam that will be the rupture part of the trim cover. There have been proposed vehicle seats that are stretched and arranged inside a cover (Japanese Patent Laid-Open Nos. 9-71204, 9-71205, and 9-123860).
[0005]
However, the webbing is only provided on one side of the side surface with a seam that becomes a breakage portion of the trim cover. In this case, it is not possible to prevent the side where the bundling is not provided from being stretched by receiving the inflation pressure of the airbag, with the seam serving as the breakage portion of the trim cover being separated.
[0006]
For this reason, it is still not sufficient if the stress due to the inflation of the air bag is instantly concentrated at the seam that becomes the fracture portion of the trim cover. Further, since the side of the trim cover on which the force cloth is not provided is extended, the airbag is inflated to the side where the trim cover is extended, so that the inflation balance or the deployment direction of the airbag cannot be determined stably.
[0007]
In addition to this, there has also been proposed one in which one end is co-sewn with the front end of the trim cover, and a bundling is provided on one side with a seam serving as a breakage portion of the trim cover (Japanese Patent Laid-Open No. 9-39711, special feature). Kaihei 9-76868). However, since the baffle is only provided on one side with a seam that becomes the breakage part of the trim cover, the side where the trim cover is not provided is stretched by receiving the inflation pressure of the airbag. I can't suppress it.
[0008]
[Problems to be solved by the invention]
In the present invention, the inflation pressure of the airbag is instantaneously concentrated on the breaking portion of the trim cover with a force cloth, so that the breaking portion of the trim cover can be reliably secured by the inflation pressure of the airbag even if the output pressure of the inflator is set low. An object of the present invention is to provide a vehicle seat provided with an incisable airbag device.
[0009]
Further, the present invention instantaneously concentrates the inflation pressure of the air bag on the breakage portion of the trim cover with a force cloth, and quickly cuts out the output pressure of the inflator from the local seam that becomes the breakage portion of the trim cover. To provide a vehicle seat equipped with an airbag device that can reliably incise the fractured portion of the trim cover with the inflation pressure of the airbag even when set to a low level, and that allows the inflation balance and deployment direction of the airbag to be determined stably. Objective.
[0010]
[Means for Solving the Problems]
In a vehicle seat provided with an airbag device according to claim 1 of the present invention, the vehicle seat includes an airbag device having an airbag that can be inflated and deployed outward with an output pressure generated by an inflator. The trim cover breaks along with the expansion and deployment of the airbag from the seam that is fitted on one side of the seat back frame and stitches the front and side terminals of the trim cover that encloses the equipment side of the airbag device. Which forms
A stretch fabric with little stretch is provided in the inflated and deployed area of the airbag over both the front side and the side of the trim cover,
The force cloth sews one end of each end together with the seam that becomes the breakage part of the trim cover, while the back pad of the back cover and the seat cover hanging part of the trim cover that hangs and pulls the other terminal on the front side to the seat back frame side. Pull the inner side of the seat back frame from the suspension hole, and pull the other terminal on the side of the side inward from the rear side of the seat back frame to connect and fasten the other terminal on the front side in series. It is configured by being stretched and arranged inside the trim cover as a surrounding cloth.
[0012]
In the vehicle seat provided with the airbag device according to claim 2 of the present invention, each short side is co-sewn to the seam as a breakage portion of the trim cover as a bundling, while the long side on the front side is trimmed. Pull the seat pad suspension along with the cover seat suspension part from the back pad suspension hole to the inside of the seat back frame, and pull the long side of the side to the inside of the rear side of the seat back frame to It is configured by stretching and arranging a bundling having a substantially trapezoidal area shape that is connected and fixed in series.
[0013]
In the vehicle seat provided with the airbag device according to claim 3 of the present invention, the baffle is formed by integrally laminating and stretching by sewing or laminating the inner side of the trim cover.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, referring to the attached drawings, FIG. 1 shows an assistant seat that accommodates and equips the airbag device 1 in the vertical direction on the right side of the seat back B as viewed from the front side of the vehicle. In this assistant seat, the front side 2a of the trim cover 2 of the seat back B that encloses the equipment side of the airbag device 1 is encased on the equipment side of the airbag device 1 (encloses the bank portion in the case of a bucket seat). A cover portion is shown.) And a side seam 2c formed by stitching the terminals of the side surface 2b.
[0015]
The airbag apparatus 1 includes an inflator (not shown), an airbag module including an airbag, and an impact sensor mounted on the vehicle body side. As shown in FIG. 2, the air bag device 1 includes an air bag case 1a, accommodates an air bag and an inflator, and a case lid 1b that can be pressed and released by the inflation pressure of the air bag is hinged to the air bag case 1a. Are attached to the side plate 4a of the seat back frame 4 by being connected to each other.
[0016]
Instead of the case-accommodating type air bag device, 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 exposed outward from the opening 5a of the back pad 5. Furthermore, it can be equipped as a direct-attached type air bag device by assembling so that it can be inflated and deployed.
[0017]
The trim cover 2 can be formed by using a single material such as genuine leather, synthetic leather, and fabric, or a wadding cover in which a skin material, a wadding 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 side 2a covering the left and right bank surfaces from the center of the seat surface and a side surface 2b extending from the circumferential side to the back are sewn together, as shown in FIG. When the back cover 6 is provided, the bag is sewn in a bag shape with an open back.
[0018]
In the case of the back coverless type, as shown in FIG. 3, the trim cover 2 is sewn into a three-dimensional bag shape in which the lower side is opened by sewing the terminals of the side surface 2b and the back surface 2d.
[0019]
The trim cover 2 can be sewn in a predetermined bag shape by sewing the whole of the upper and lower sewing threads with a thread number of about 8 that can withstand normal usability. In addition, the general part is sewn with a thread having a count of about 8 as upper and lower sewing threads, and the seam 2c to be the breaking part 3 of the trim cover 2 is made up of a thread having a count of about 8 and a thread of about 20 count. By sewing as a sewing thread, it is possible to sew easily while keeping the strength to withstand normal usability. The breaking portion 3 can be formed so as to be incisable by cutting the sewing thread of the seam 2c by the stress caused by the expansion of the air bag or by allowing the seam allowance of the seam 2c to be frayed by the sewing thread.
[0020]
The trim cover 2 has an air bag inflated and deployed on the inner side of the front side 2a and the side surface 2b covering the bank portion of the seat back B from the seam 2c where the force fabrics 7 and 8 form the breaking portion 3. Attached to the area. Each of the force cloths 7 and 8 has a substantially trapezoidal area shape, and is formed of a material that does not stretch even when subjected to the inflation pressure of the airbag 1a, such as a polyester nonwoven fabric or cotton cloth. The force cloths 7 and 8 can be attached to the trim cover 2 by laminating or sewing together on the inner side of the front side 2a and the side surface 2b enclosing the bank portion of the seat back B.
[0021]
As shown in FIG. 1, the force cloths 7 and 8 are formed with seams 2 c that form the short side portions of the trim cover 2 as the breaking portions 3 when the front side 2 a and the side surface 2 b of the trim cover 2 are stitched together. Co-sewn locally. The local area where the short sides are co-sewn may be positioned corresponding to the case lid 1b of the airbag case 1a or approximately at the center in the longitudinal direction of the airbag.
[0022]
As shown in FIG. 2, the long side of the baffle 7 has a seat back frame 2 from the hanging hole 5 b of the back pad 5 together with a seat surface hanging part 2 e formed by sewing the center of the seat surface and the front side of the trim cover 2. Pull inside 4 The long side of the webbing 8 is pulled together from the back of the seatback frame 4 to the inside of the seatback frame 4 together with the side surface side of the trim cover 2 to be connected and fastened in series with the long side of the webbing 7. As a result, the webbings 7 and 8 are arranged so as to surround the airbag device 1 and are stretched inside the front side 2 a and the side 2 b of the trim cover 2.
[0023]
For suspending the force cloths 7 and 8, a listing wire 9 having ring-shaped ring portions 9a and 9b of wisdom in which the ends of the wires are bent once by rotation can be used. The listing wire 9 is located between the back springs 10 of the seat back B, and the suspension wire 21 of the hanging bag 20 sewn on the seat surface hanging portion 2e of the trim cover 2 is hooked on the ring portion 9a on one side. By hanging the hanging bag 22 sewn on the side surface side end of the trim cover 2 to the ring portion 9b on the other side with the clip 23, the ends of the force cloths 7 and 8 can be hung and secured in series. it can.
[0024]
In the case of the back coverless type, as shown in FIG. 3, the hanging bag 22 is sewn together with the terminals of the side surface 2 b and the rear surface 2 d of the trim cover 2, and the hanging bag 22 is listed with a clip 23. The long side of the webbing 8 may be suspended and fastened by being hooked on the ring portion 9b of the wire 9. Other than this, the short sides of the force cloths 7 and 8 were sewn together to the seam 2c which becomes the breaking portion 3 of the trim cover, and the long sides of the force cloth 7 were sewn to the seat surface hanging portion 2e of the trim cover 2. The suspension wire 21 of the hanging bag 20 may be fastened to the end with the listing wire 9 by being hooked on the ring portion 9a on one side.
[0025]
According to the suspension of the webbings 7 and 8 using the listing wire 9, the webbings 7 and 8 can be firmly fixed to the end of the airbag so as to be able to withstand the inflation pressure of the airbag, and can be attached to both the front side 2a and the side 2b. It can be connected in series so as to cross, and can be tensioned inside the trim cover 2.
[0026]
In the vehicle seat configured as described above, when an impact sensor provided on the vehicle body side operates and an output signal is transmitted from the impact sensor to the inflator, the airbag receives the output pressure of the inflator and is inflated and deployed. Along with this, the webbings 7 and 8 are positioned in the inflated and deployed region of the airbag, and are pressed and pulled from the inside by the inflation pressure of the airbag.
[0027]
At that time, the force cloths 7 and 8 receive the inflation pressure of the air bag, but neither stretches, and the end of the seam 2c that becomes the breaking portion 3 of the trim cover and the other end are connected and connected in series. Since they are pulled from each other and exert a tensioning action, the stress caused by the inflation of the airbag can be instantaneously concentrated on the seam 2c that becomes the breaking portion 3 of the trim cover 2.
[0028]
In addition, from the fact that each buff 7, 8 has a substantially trapezoidal area shape, it receives the inflation pressure of the airbag over a wide area, and at the local part of the seam 2 c that becomes the breaking part 3 in which each short side is co-sewn. On the other hand, the stress caused by the inflation of the airbag is instantly concentrated.
[0029]
For this reason, the seam 2c which becomes the breaking portion 3 is quickly pulled out by the local portion where the short sides of the force cloths 7 and 8 are co-sewn together being strongly pulled by the force cloths 7 and 8, and the cut-out is the inflation pressure of the airbag. Therefore, since the seam 2c continuously extends in the length direction, the seam 2c necessary for inflating and deploying the airbag can be incised quickly and reliably even if the output of the inflator is set low.
[0030]
In addition, since the webbings 7 and 8 do not extend, the predetermined length or width is maintained, so that the airbag is stably inflated and deployed while maintaining a predetermined predetermined inflation balance and deployment direction. be able to.
[0031]
The bank portion of the back pad 5 has a shape retaining property that can withstand the pulling of the force cloths 7 and 8, but the bank portion of the back pad 5 is raised so as to prevent the bank portion of the back pad 5 from being compressed and deformed. It can also be formed with a hardness.
[0032]
Although the above-described embodiment has been described based on a substantially trapezoidal area shape suitable as the buffs 7 and 8, in addition, as shown in FIG. Alternatively, as shown in FIG. 5, a combination of areas corresponding to substantially the entire front side 2a covering the bank portion of the back pad 5 and substantially the entire side surface 2b is combined. Further, as shown in FIGS. The same effect can also be exhibited by extending and arranging any one of the substantially trapezoidal shape, the belt shape, and the substantially entire surface on the front side 2a and the side surface 2b.
[0033]
【The invention's effect】
As described above, according to the vehicle seat including the airbag device according to the first aspect of the present invention, each end of the buff is sewn together with the seam that becomes the fracture portion of the trim cover, Pull the other terminal to the seat back frame side and pull the tension cover to the inside of the seat back frame along with the seat cover hanging part of the trim cover and pull the other terminal to the rear side of the seat back frame. Pulling inward from the side, it is connected and fixed in series with the other terminals on the front side, and is stretched and arranged inside the trim cover as a baffle that surrounds the air bag device. Since the pulling action is exerted by pulling each other at the time of receiving, the stress due to the inflation of the air bag can be instantaneously concentrated on the seam that becomes the fracture portion of the trim cover. Thereby, even if the output of the inflator is set low, it is possible to quickly and surely incise the seam that becomes the fracture portion of the trim cover.
[0034]
According to the vehicle seat including the airbag apparatus according to claim 2 of the present invention, the inflation pressure of the airbag is received by each large-area substantially trapezoidal force cloth, and the short sides of each force cloth are sewn together. A concentrated action can be instantaneously applied to the local area of the seam that becomes the breakage portion of the trim cover. For this reason, the seam is pulled strongly by the power cloth from the local area where the short side of the power cloth is co-sewn and quickly cut out, and the cut extends continuously in the length direction of the seam by the inflation pressure of the airbag. Thus, even if the output of the inflator is set low, it is possible to quickly and surely incise the seam that becomes the fracture portion of the trim cover.
[0035]
According to the vehicle seat provided with the airbag device according to claim 3 of the present invention, the force cloth is stitched or laminated on the inner side of the trim cover, and the force cloth is attached to the trim cover. It is possible to sew the seam that can be easily assembled so as to be a broken portion of the trim cover so that the seam can be cut quickly and surely, and the bundling can be easily assembled and sewn to the trim cover.
[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 cross-sectional view showing a seat back according to an embodiment of the vehicle seat.
FIG. 3 is a partially enlarged cross-sectional view showing a seat back according to another embodiment of the vehicle seat.
4 is a perspective view generally showing a vehicle seat provided with a webbing in a form different from that shown in FIG. 1 in the airbag apparatus according to the present invention.
5 is a perspective view generally showing a vehicle seat provided with a webbing in a form different from that shown in FIG. 1 in the airbag apparatus according to the present invention.
6 is a perspective view generally showing a vehicle seat provided with a webbing in a form different from that shown in FIG. 1 in the airbag apparatus according to the present invention. FIG.
7 is a perspective view generally showing a vehicle seat provided with a webbing in a form different from that shown in FIG. 1 in the airbag apparatus according to the present invention. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Air bag apparatus 2 Trim cover 2a Front side of trim cover 2b Side surface side of trim cover 2c Seam of terminal of front side and side surface 2d Trim cover seat surface hanging part 3 Trim cover breaking part 4 Seat back frame 5 Back pad 5b Back pad hanging hole 7, 8

Claims (3)

An air bag device having an air bag that can be inflated and deployed outward with an output pressure generated from an inflator is provided, and the air bag device is mounted on one side of the seat back frame, and the air bag device is mounted on the side of the air bag device. In a vehicle seat provided with an airbag device that forms a fracture portion of a trim cover accompanying the inflation and deployment of an airbag from a seam obtained by stitching together the front and side terminals of the trim cover to be encapsulated,
A stretch fabric with little stretch is provided in the inflated and deployed area of the airbag over both the front side and the side of the trim cover,
The force cloth sews one end of each end together with the seam that becomes the breakage part of the trim cover, while the back pad of the back cover and the seat cover hanging part of the trim cover that hangs and pulls the other terminal on the front side to the seat back frame side. Pull the inner side of the seat back frame from the suspension hole, and pull the other terminal on the side of the side inward from the rear side of the seat back frame to connect and fasten the other terminal on the front side in series. A vehicle seat provided with an airbag device, characterized in that it is stretched and arranged inside a trim cover as a surrounding cloth.   As the above-mentioned baffle, each short side is jointly sewn locally to the seam that becomes the breakage part of the trim cover, while the long side on the front side together with the seat surface hanging part of the trim cover from the hanging hole of the back pad Pull the inner side of the seat back and pull the long side of the side to the inner side from the rear side of the seat back frame, and stretch the power cloth with a substantially trapezoidal area shape that is connected and fixed in series with other terminals on the front side It arrange | positions, The vehicle seat provided with the airbag apparatus of Claim 1.   The vehicular seat comprising the airbag device according to claim 1 or 2, wherein the force cloth is integrally laminated by being sewn or laminated inside the trim cover.

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