JP3831810B2 - Vehicle seat with side airbag device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides a front cover of a trim cover that equips one side portion of a seat back frame with an airbag device having an airbag that can be inflated and deployed with an output pressure generated from an inflator, and encloses the equipment side of the airbag device. The present invention relates to an improvement in a vehicle seat provided with a side airbag device that forms a breakage portion of a trim cover that accompanies inflation and deployment of an airbag from a seam obtained by stitching together terminals of a portion and a side cover portion.
[0002]
[Prior art]
In general, vehicle seats are equipped with an air bag that can be inflated and deployed toward the side of the occupant's torso as a countermeasure for mitigating impact caused by a side collision, and inflated and deployed toward the side of the occupant and the side of the head. Some are equipped with possible air bags. In the latter case, two airbag devices each having an airbag that can be inflated and deployed toward the torso side portion and the head side portion of the occupant are provided separately. Some have an airbag device having one airbag that generates a bulge portion that can be inflated and deployed.
[0003]
Conventionally, in a vehicle seat equipped with a side airbag device, in addition to sewing a general portion of a trim cover from a sewing thread having a normal strength, a front cover portion and a side cover of the trim cover that encloses the equipment side of the airbag device. A device has been proposed in which a seam between relatively weak strength sewing threads is sewn between the ends of the airbag and a break portion that is incised by the inflation pressure of the air bag generated by the output of the inflator from the seam by the weak strength sewing thread (Japanese Patent Laid-Open 8-216820).
[0004]
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.
[0005]
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).
[0006]
However, the webbing is only provided on the side cover portion side of one side with a seam that becomes a breakage portion of the trim cover. For this reason, it is not possible to prevent the trim cover from being stretched by receiving the inflation pressure of the airbag over the side where the trim cover is broken, and the side on which the baffle is not provided is subjected to the inflation pressure of the airbag. It cannot be said that it is sufficient to quickly concentrate a part of the sewing thread by quickly concentrating on the seam to be a broken part.
[0007]
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.
[0008]
In addition to this, there has also been proposed one in which one end is co-sewn with the end of the front cover portion, and a bundling is provided on the side of the front cover portion with a seam serving as a breaking portion of the trim cover (Japanese Patent Laid-Open No. 9-39711). JP-A-9-76868). However, even if this is done, the side of the trim cover that is not equipped with the blanket only receives the inflation pressure of the airbag because the blanket is only provided on one side across the seam that becomes the breakage part of the trim cover. I can't keep it from growing.
[0009]
[Problems to be solved by the invention]
The present invention individually includes an airbag device having an airbag that can be inflated and deployed with an output pressure generated from an inflator, corresponding to a torso side portion and a head side portion of a seat. A side airbag device that can reliably cut the rupture part of the trim cover with the inflation pressure of the airbag even if the output pressure of the inflator is set low, by instantly concentrating it on the rupture part of the trim cover with a force cloth An object is to provide a vehicle seat provided.
[0010]
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 a side airbag device that can reliably cut an opening portion of a trim cover with the inflation pressure of an airbag even when set to a low level, and can also stably determine the inflation balance and deployment direction of the airbag. With the goal.
[0011]
It is another object of the present invention to provide a vehicle seat including a side air bag device that includes a blanket and can be easily assembled.
[0012]
[Means for Solving the Problems]
In the vehicle seat including the side airbag device according to claim 1 of the present invention, the airbag device having each airbag that can be inflated and deployed by the output pressure generated by the inflator is provided on one side of the seat back frame. to be equivalent to the body side and head side portions juxtaposed, inflation and deployment of the air bag equipment side seam that stitched the terminal between the front cover portion and the side cover portion of the trim cover encapsulating each air bag device The trim cover breakage part is formed, and one end is jointly sewn to the seam that becomes the breakage part of the trim cover, and the other end is fixed to the seat back frame side, and the trim cover starts from the seam that becomes the breakage part. of the front cover portion and inwardly over both the side cover portion, it is provided with less webbing elongation, cloths of at least the side cover portion side seat's It is constituted by being provided individually spaced from each other a predetermined distance in the inflation and deployment area of each of the air bag corresponding to the cylinder side and head side portions.
[0013]
In the vehicle seat including the side airbag device according to claim 2 of the present invention, each short side is aligned with each other as a bundling and is co-sewn on the seam to be a broken portion of the trim cover. The terminal is fastened to the seat back frame side, and a blanket having an area shape with one side long and the other side short is individually provided in the inflating and deploying region of each airbag corresponding to the torso side portion and the head side portion of the seat. It is comprised by extendingly arranging to.
[0014]
In the vehicular seat including the side airbag device according to claim 3 of the present invention, the baffle on the front cover portion side has an area shape corresponding to substantially the entire front cover portion covering the bank portion of the seat back. It is constituted by.
[0015]
In the vehicle seat provided with the side airbag device according to claim 4 of the present invention, the baffle is constituted by sewing and laminating inside the trim cover and integrally laminating and stretching.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Referring to the accompanying drawings, FIG. 1 shows an air bag device 1 (1 ') having air bags that can be inflated and deployed with an output pressure generated from an inflator from the front side of the vehicle. An assistant seat that is arranged side by side corresponding to the trunk side portion and the head side portion and individually accommodated in the vertical direction of the right side portion of the seat back B is shown.
[0017]
In the assistant seat, in the trim cover 2 of the seat back B, the breakage portion 3 accompanying the inflation and deployment of the airbag covers the front side cover portion 2a (in the case of a bucket seat, the back cover portion) enveloping the equipment side of the airbag device 1 (1 '). The cover portion for covering the bank portion of the pad is shown.) And the side cover portion 2b are formed with seams 2c stitched together.
[0018]
Each airbag device 1 (1 ') is configured to include an inflator (not shown), an airbag module including an airbag, and an impact sensor provided on the vehicle body side. The air bag device 1 (1 ') includes an air bag case 1a as shown on one side in FIG. 2. The air bag device 1 (1') includes 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. A case housing type that is connected to the airbag case 1a by a hinge is mounted by being attached to the side plate 4a of the seat back frame 4.
[0019]
Instead of the case housing type air bag device 1 (1 '), 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 equipped as a direct-mounted type by assembling so that it can be expanded and deployed outward.
[0020]
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. This trim cover 2 corresponds to the seat back B having a bank portion, and the front side covering the left and right bank surfaces from the center of the seat surface and the side surface extending from the peripheral side surface to the back side are sewn together, as shown in FIG. When the cover 6 is provided, the cover 6 is sewn in a bag shape with an open back. Further, in the case of the back coverless type, it is sewn into a three-dimensional bag shape in which the lower side is opened by sewing the terminals of the side surface side and the back surface side.
[0021]
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 fractured 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 airbag or causing the seam allowance of the trim cover 2 to fray.
[0022]
As shown in FIG. 1, the trim cover 2 has a pair of the front cover portion 2a and the side cover portion 2b from the seam 2c where the buffs 7a, 7b, 8a, and 8b become the breaking portions 3, and the torso of the seat Each pair is individually provided in the inflated and deployed region of the airbag corresponding to the side portion and the head side portion. Among the webbings 7a, 7b, 8a, 8b , at least the webbings 8a, 8b on the side surface cover 2b side are individually provided with a predetermined distance therebetween .
[0023]
Each of the power cloths 7a, 7b, 8a, 8b preferably has a substantially trapezoidal area shape with a short one side and a long other side, and it does not stretch even when subjected to the inflation pressure of an air bag such as a polyester nonwoven fabric or cotton cloth. It is made of a few materials. The force cloths 7a, 7b, 8a, 8b can be installed inside the trim cover 2 by sewing or laminating them inside the front cover part 2a and the side cover part 2b and integrally laminating them.
[0024]
The force cloths 7a, 7b, 8a, 8b are arranged so that the short sides of the trim cover 2 are aligned with each other when the ends of the front cover portion 2a and the side cover portion 2b of the trim cover 2 are sewn together. The seam 2c is stitched together 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.
[0025]
As shown in FIG. 2, the long sides of the force cloths 7 a and 7 b are suspended and fastened to the back cushion 10 side by the listing wire 9 from the suspension hole 5 b of the back pad 5 together with the seat surface suspension portion 2 d of the trim cover 2. . Further, the long sides of the baffles 8a and 8b are fixed to the retainer 4b of the seat back frame 4 together with the ends of the side cover portion 2b with wires 4c.
[0026]
In the case of a back coverless type (not shown), the trim cover 2 may be fastened to the retainer 4b of the seat back frame 4 with the wire 4c together with the terminal stitched portions of the side surface side and the back surface side. Other than that, each short side of the power cloths 7a, 7b, 8a, 8b is stitched together with the seam 2c which becomes the breakage part 3 of the trim cover, and the long sides of the power cloths 7a, 7b are suspended from the seat surface of the trim cover 2. What is necessary is just to suspend and fix to the back spring 10 with the listing wire 9 with the part 2. FIG.
[0027]
As a result, the baffles 7a, 7b, 8a, 8b can be firmly fixed to the end of the airbag so as to withstand the inflation pressure of the airbag, and are pulled inside the trim cover 2 across both the front cover portion 2a and the side cover portion 2b. Can be arranged.
[0028]
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. Accordingly, if the airbag apparatus 1 or 1 'is of a case-accommodating type, the case lid 1b is pushed by the inflating airbag and rotates in the opening direction, and a force is applied to the opening side of the case lid 1b. Since the fabrics 8a and 8b are stretched and arranged, the inflation pressure of the airbag acts on the wide area side of the force fabrics 8a and 8b. Further, the stress due to the expansion of the airbag acts on the power cloths 7a and 7b which are co-sewn by aligning the short sides from the short side of the power cloths 8a and 8b.
[0029]
Since the webbings 7a, 7b, 8a, 8b are all difficult to stretch even when subjected to stress due to the inflation of the airbag, the webbings 7a, 7b, 8a, 8b are thrust against each other as shown in FIG. At the same time, the stress due to the inflation of the airbag is concentrated at the seam portion on the short side, and the sewing thread is strongly pulled in the separation direction at the seam allowance on the short side.
[0030]
Further, since the baffles 8a and 8b have a substantially trapezoidal area shape, the wide area of the buffs 8a and 8b is pressed by the case lid 1b, and the airbag inflated by the wide area of the buffs 8a and 8b is expanded. The stress due to is concentrated on the short side from the opposite hypotenuse of the webbings 8a and 8b. As a result, the sewing thread is strongly pulled in the separation direction by the seam allowance of each short side, so that the sewing thread at that portion is instantaneously cut as shown in FIG.
[0031]
As the air bag progresses, a part of the air bag bulges out from the case lid 1b, so that the front cover around the seam 2c of the trim cover 2 where the webbing 7a, 7b, 8a, 8b is not stretched is arranged. The part 2a and the side cover part 2b are pressed from the inside.
[0032]
When the airbag is pressed, the area portions of the front cover portion 2a and the side cover portion 2b extend as shown in FIGS. 5 and 6, but the seam allowance of each cover portion 2a, 2b pulls the sewing thread. Needle for inflating and deploying the airbag even if the output of the inflator is set low because the sewing thread is pulled out from the seam 2c from the cut end, and this withdrawal continuously extends in the length direction of the seam 2c by the inflation pressure of the airbag. It is possible to quickly and surely incise the seam 2c.
[0033]
Further, the force cloths 7a, 7b, 8a, 8b are all difficult to extend, and even if the front cover part 2a and the side cover part 2b of the trim cover 2 where the force cloths 7a, 7b, 8a, 8b are not stretched are arranged. Since the elongation rate is constant, in order to maintain the length or width of the front cover portion 2a and the side cover portion 2b evenly, the airbag has a predetermined predetermined expansion balance and a predetermined deployment direction. It can be maintained and stably expanded.
[0034]
The bank portion of the back pad 5 has a shape retaining property that can withstand the pulling of the force cloths 7a, 7b, 8a, and 8b. However, the back pad 5 can be reliably prevented from being compressed and deformed. The bank portion of 5 can be formed to have a high hardness.
[0035]
The above-described embodiment has been described on the basis of having a substantially trapezoidal area shape suitable as each buff 7a, 7b, 8a, 8b. However, if the opposite one side 70a is short and the other side 70b is long. As shown in FIG. 7, a webbing 70 having a planar bowl-shaped area can also be used. In this case, since the air bag device 1 (1 ′) can be entirely covered with a wide area of the long side 70b, the case lid or the air bag can be stably received in a wide area.
[0036]
The short side 70a of the webbing 70 including the substantially trapezoidal webbing described above preferably has a length of about 25 mm. If the length is 50 mm or less, the inflation pressure of the airbag is instantly applied to the sewing thread at the joint location. It can be concentrated.
[0037]
In addition, as shown in FIG. 8, the belt-like ones can be combined as the webbings 7a, 7b, 8a, 8b. As shown in FIG. 9, the front cover portion 7 a (7 b) on the front cover portion 2 a side has an area shape corresponding to substantially the entire surface of the front cover portion 2 a that covers the bank portion of the back pad 5. A similar effect can be achieved by arranging the belt-like member individually in the inflated and deployed region of the airbag corresponding to the torso side portion and the head side portion of the seat.
[0038]
【The invention's effect】
As described above, according to the vehicle seat including the side airbag device according to claim 1 of the present invention, the airbag device having the airbag that can be inflated and deployed by the output pressure generated by the inflator is provided on the seat back frame. One side is arranged side by side corresponding to the torso side and the head side of the seater, and a stretch cloth with little stretch is provided on the inner side of both the front cover part and the side cover part of the trim cover, and at least the side cover part since the side of the webbing is provided separately by a predetermined distance apart from each other in the inflation and deployment area of each of the air bag corresponding to the cylinder side and head side portions of the seat's between small webbing elongation, cloths Since there is a side cover portion that is easier to extend, a difference is produced in the elongation when the airbag is inflated , so that the seam that becomes the fracture portion is easily incised . Thereby , even if the output of the inflator is set low, the seam that becomes the fracture portion of the trim cover can be quickly and reliably incised.
[0039]
According to the vehicle seat provided with the side airbag device according to claim 2 of the present invention, the extension of the front cover portion and the side cover portion of the trim cover due to the inflation pressure of each airbag can be suppressed by each pair of webbings. At the same time, the inflation pressure of the airbag can be received by each large-area force cloth, and can be instantaneously concentrated on the local area of the seam that becomes the break part of the trim cover where the short sides of the respective force cloths are co-sewn. For this reason, the seam is pulled strongly from the local area where the short sides of each buffet are co-sewn and is quickly cut out, and the cutout continues in the length direction of the seam by the inflation pressure of each airbag. By extending, 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.
[0040]
According to the vehicle seat provided with the side airbag device according to claim 3 of the present invention, the area shape corresponding to substantially the entire front cover portion covering the bank portion of the seat back as the front cover portion side blanket. since is provided having a by webbing provided separately by a predetermined distance apart from each other in the inflation and deployment area of each of the air bag corresponding to the cylinder side and head side portions of the seat's air bag inflated and expanded seams required for the out off quickly pulled strongly localized, since the cut-out extends the length of the seam substantially in the webbing area shape corresponding to the entire surface of the front cover portion, a breaking portion of the trim cover The resulting seam can be incised quickly and reliably .
[0041]
According to the vehicle seat including the side airbag device according to claim 4 of the present invention, each bundling is integrally laminated and stretched by stitching or laminating inside the trim cover. The seam that can be easily assembled to the trim cover and can be cut quickly and reliably can be sewn so that the trim cover can be broken, and the baffle 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 a side 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 an explanatory view showing an action of a bundling at the initial stage of inflation of the airbag of the vehicle seat.
FIG. 4 is an explanatory view showing a state in which a sewing thread is cut off as the airbag is inflated in the vehicle seat.
FIG. 5 is an explanatory diagram showing an extended state of the trim cover in the initial stage of inflation of the airbag of the vehicle seat.
6 is an explanatory view showing the stretched state of the trim cover in the same initial stage of inflation of the airbag as in FIG. 5. FIG.
FIG. 7 is a plan view showing a webbing having a short side and a long side according to another embodiment provided in the vehicle seat.
FIG. 8 is a perspective view generally showing a vehicle seat provided with a webbing of another form different from that of FIG. 1;
FIG. 9 is a perspective view generally showing a vehicle seat provided with a webbing in a form different from that of FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 (1 ') Airbag apparatus 2 Trim cover 2a Front cover part of trim cover 2b Side cover part of trim cover 2c Seam of terminal of front side and side 3 Trim cover break part 4 Seat back frame 5 Back pad 7a , 7b, 8a, 8b, 70

Claims (4)

Airbag devices each having an air bag that can be inflated and deployed with an output pressure generated from an inflator are arranged side by side corresponding to the torso side portion and the head side portion of a seat back frame on one side portion of the seat back frame, and each of the air bag devices. The trim cover rupture portion is formed along with the expansion and deployment of the airbag from the seam obtained by stitching the ends of the front cover portion and the side cover portion of the trim cover covering the equipment side of the trim cover, and the rupture portion of the trim cover is formed at one end. The joint is sewn together at the seam, and the other end is fastened to the seat back frame, and the stretched cloth is less stretched from the seam that becomes the breakage part to the inside of both the front cover part and the side cover part of the trim cover. the provided, at least the side cover portion of the webbing is a seat's torso side and a predetermined distance from each other in the inflation and deployment area of each of the air bag corresponding to the head side portions away Vehicle seat provided with a side air bag device according to claim Rukoto provided separately by.   As the above-mentioned baffle, the respective short sides are aligned with each other and co-sewn locally at the seam that becomes the breakage part of the trim cover, while the long sides are fastened to the seat back frame side and the opposite one side is short and the other The side air according to claim 1, characterized in that a stretcher having an area shape with a long side is separately stretched and arranged in an inflating and deploying region of each airbag corresponding to the torso side portion and the head side portion of the seat. Vehicle seat provided with a bag device. 2. The vehicle including the side airbag device according to claim 1, wherein the front cover portion side cloth has an area shape corresponding to substantially the entire front cover portion covering the bank portion of the seat back. Sheet . The vehicular seat provided with the side airbag device according to any one of claims 1 to 3, wherein the bundling is integrally laminated by being sewn or laminated inside the trim cover.

Images