JP4823855B2 - Vehicle seat provided with a side airbag device - Google Patents

Description

  According to the present invention, the airbag device is attached to one side portion of the back frame and arranged inside the opening provided in the side portion of the back pad, and the front side and the side surface of the trim cover that encloses the arrangement side of the airbag device. The present invention relates to a vehicle seat including a side airbag device that forms a breakage portion of a trim cover that accompanies the inflation and deployment of an airbag from a seam obtained by stitching together terminals with the side.

  Already, the airbag device is attached to one side portion of the back frame and disposed inside the opening provided in the side portion of the back pad, and the front side and side surface side of the trim cover that encloses the arrangement side of the airbag device, 2. Description of the Related Art A vehicle seat including 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 the terminals is known.

  The side airbag device is provided with an airbag including a bag portion that inflates toward the occupant's head and a bag portion that inflates toward the occupant's waist.

  In installing the airbag, the side surface portion, the shoulder surface portion, and the back surface portion that are continuous from the seat surface portion are provided on the upper front side of the opening in the back pad. Therefore, the bag portion that inflates and expands upward toward the head of the occupant can be prevented from entering the back pad.

  On the other hand, although there is a side surface portion that continues from the seat surface portion on the front lower side of the opening portion, the lower portion and the back portion are open because the back frame needs to be assembled. In the front lower side of the back pad from within the front lower corner of the seat, lack of rigidity capable of resisting inflation and deployment of the airbag, and the bag portion that inflates and deploys downward toward the waist of the occupant may sink into the back pad There is a risk that it will occur and cannot be expanded and deployed stably.

  Conventionally, in order to inflate and deploy the airbag stably and to efficiently apply the inflation pressure of the airbag to the fractured portion of the trim cover, one end is co-sewn with the stitching side that is the fractured portion of the trim cover, and others. It has been proposed to wrap an airbag device with two front and rear webbings that wind and fix the terminal from the opening of the back pad to the back frame side (Patent Document 1).

Among the blankets, one blanket extends from the front side in the mouth of the opening to the front side of the back pad, and is provided from the front lower corner of the opening to the front lower side of the back pad. Not.
JP-A-8-258660

  According to the present invention, an airbag comprising a bag portion that inflates toward the head of the seat and a bag portion that expands toward the waist of the seat can be inflated from an opening provided on one side of the back pad. Provided is a vehicle seat that includes a side airbag device that prevents intrusion into a back pad of a bag portion that inflates toward the waist of a seated person, and that can be stably inflated and deployed from a broken portion of a trim cover as a whole bag. Is an issue.

The present invention includes an airbag device having an airbag composed of a bag portion that inflates toward the seated person's head and a bag portion that expands toward the seated person's waist, and the airbag device is mounted on the back frame. It is attached to one side of the back pad and arranged inside the opening provided on one side of the back pad, and the air from the seam that stitches the front and side terminals of the trim cover that encloses the arrangement side of the airbag device. In a vehicle seat including a side airbag device that forms a breakage portion of a trim cover that accompanies the expansion and deployment of a bag,
One end of the back pad is sewn together with the stitched side that will be the rupture part of the trim cover, and the other end is wrapped around the back frame side from the opening of the back pad and fastened to secure the back pad from the front lower corner of the opening. It is characterized by wrapping an area region covering the front lower surface.

  According to the vehicle seat provided with the side airbag device according to the present invention, when the airbag is inflated and deployed, the force cloth that wraps the area region extending from the front lower corner of the opening to the front lower side of the back pad is the waist of the seated person. Since it becomes a guide of the bag part which expand | swells toward a direction and the penetration | invasion with respect to the back pad of the said bag part can be prevented, the said bag part can also be extended smoothly toward the fracture | rupture part of a trim cover.

  Hereinafter, referring to the attached drawings, FIG. 1 shows a back pad 1 for a seat provided with a side airbag device from one side. The back pad 1 is provided with a vertically long opening 2 that is required for assembling an airbag case-accommodating airbag device (not shown). In the back pad 1, an area region (see the hatched portion) extending from the inside of the front lower corner of the opening 2 to the front lower side of the back pad 1 is wrapped with the webbing 3.

  The force cloth 3 is made of a material with little elongation such as a polyester nonwoven fabric or cotton cloth. As shown in FIG. 2, the webbing 3 has one end co-sewn with the stitching side 5 which is a broken portion of the trim cover 4, and the other end is wound inside the opening 2 of the back pad 1 to be described later. Since the terminal is fixed to the side plate of the frame, it is stretched so as to wrap around an area region extending from the front lower corner of the opening 2 to the front lower side of the back pad 1.

  As shown in FIG. 3, the airbag device 6 includes an airbag 6a and an inflator (not shown) accommodated in a bag case 6b that can be opened by the inflation pressure of the airbag 6a. As described later, the airbag 6a includes a bag portion that expands toward the head of the occupant (hereinafter referred to as “upper bag portion”) and a bag portion that expands toward the waist portion (hereinafter referred to as “lower bag portion”). )) And the one that expands in an approximately twin mountain shape.

  The airbag device 6 is fixed to the side plate 7a of the back frame 7 by bolting, and the case lid of the bag case 6b is attached to one side of the back pad 1 with the case lid facing outward from the opening 2 of the back pad 1. . The trim cover 4 includes a front cover (a bank surface cover is shown in the case of a bucket seat) 4b and a side cover 4c in which a breaking portion 4a accompanying the inflation and deployment of the airbag 6a covers the equipment side of the airbag device 6. The seam is formed by stitching between the terminals.

  In place of the case housing type, an air bag module including an inflator and an air bag is directly attached to the side plate of the back frame, and the air bag is attached to the opening of the back pad so as to be inflated and deployed outward. A direct attachment type can be equipped as an airbag device.

  As shown in FIG. 4, the trim cover 4 is divided into a front cover 4b and a side cover 4c from the seam forming the fractured portion 4a so as to be provided with force cloths 8 and 9 in the inflated and deployed region of the airbag. it can. The force cloths 8 and 9 can be attached to the trim cover 4 by being integrally laminated by sewing or laminating inside the front cover 4b and the side cover.

  Each of the force cloths 8 and 9 can be formed of a material that does not stretch even when subjected to the inflation pressure of an airbag such as a polyester nonwoven fabric or cotton cloth. As the force cloths 8 and 9, the upper bag portion that inflates and deploys toward the head of the seat and the lower bag portion that inflates and deploys toward the waist of the seat is initially broken to be inflated and deployed separately. It is possible to equip a portion corresponding to the center of which is cut out in a concave shape.

  One ends of the force cloths 8 and 9 are sewn together by a seam that forms the fracture portion 4 a of the trim cover 4. The other end of the force cloth 8 is suspended and fastened inside the back pad 1 with a wire ring 11 that is hooked between the hanging portion 4d of the front cover 4b and the support spring 10 of the back pad 1. The other end of the force cloth 9 is tensioned and fixed to the retainer 7b of the back frame 7 together with the hanging portion 4e of the side cover 4c by the wire ring 12. In addition, the code | symbol 13 in FIG. 4 shows a backboard.

  In the vehicle seat including the side airbag device configured as described above, when the impact sensor provided on the vehicle body side operates and an output signal is transmitted from the impact sensor to the inflator, the airbag 6a is shown in FIG. Expands and expands in response to the output pressure of the inflator.

  When the airbag 6a is inflated and deployed, the rigidity that can resist the inflation and deployment of the airbag 6a at the side surface portion, the shoulder surface portion, and the back surface portion that are continuous from the seat surface portion on the front upper side of the opening 2 in the back pad 1 Therefore, the upper bag portion 60 can be smoothly deployed toward the broken portion 4a of the trim cover 4 by preventing the upper bag portion 60 from entering the back pad 1.

  In the back pad 1 on the front lower side of the opening 2, even if the lower portion and the rear portion are not open and rigid enough to resist the inflation and deployment of the airbag 6 a, the opening 2 is located in the lower front corner of the opening 2. Since the force cloth 3 that wraps the area region extending over the front lower surface of the back pad 1 serves as a guide and prevents the back pad 1 from entering the back pad 1, the lower bag portion 61 can also be smoothly deployed toward the broken portion 4 a of the trim cover 4.

  At the same time, the force cloths 8 and 9 receive the inflation pressure of the air bag 6a, but neither of them stretches and acts as a tension so as to pull each other, so that the air bag is against the seam that becomes the breaking portion 4a of the trim cover 4. The stress caused by the expansion of the material is instantly concentrated. For this reason, since the seam which becomes the fracture | rupture part 4a is pulled strongly by the force cloths 8 and 9, and cuts out rapidly, the seam required for the inflation and deployment of the airbag can be incised quickly and reliably.

  The force cloths 8 and 9 are provided with notches corresponding to the center of the breaking part 4a, so that the seams that become the breaking parts 4a are cut individually across the notch parts of the force cloths 8 and 9. Will come out. As a result, the upper bag portion 60 that is initially inflated and deployed toward the head of the seat and the lower bag portion 61 that is inflated and deployed toward the waist of the seat are individually inflated and deployed. The expansion and deployment directions 60 and 61 can be determined stably.

It is a side view which shows the back pad for sheets provided with the side airbag apparatus which concerns on this invention. It is a perspective view which partially cuts and shows the seat back by the back pad. It is sectional drawing which shows the seat back of the vehicle seat which concerns on this invention. 1 is a perspective view generally showing a vehicle seat according to the present invention. It is explanatory drawing which shows the seat back of the vehicle seat which concerns on this invention in the expansion | deployment deployment state of an airbag.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Back pad 2 Opening part 3 Force cloth 4 Trim cover 4a Trim cover fracture | rupture part 5 Trim cover seam 6 Airbag apparatus 7 Back frame

Claims (1)

An airbag device having an airbag comprising a bag portion that inflates toward the occupant's head and a bag portion that inflates toward the occupant's waist, and the airbag device is provided on one side of the back frame. The airbag is inflated and deployed from the seam that is attached to the inside of the opening provided on one side of the back pad and stitches the front and side terminals of the trim cover that encloses the arrangement side of the airbag device. In a vehicle seat including a side airbag device that forms a breakage portion of a trim cover associated with
One end of the back pad is sewn together with the stitched side that will be the rupture part of the trim cover, and the other end is wrapped around the back frame side from the opening of the back pad and fastened to secure the back pad from the front lower corner of the opening. A vehicle seat provided with a side airbag device characterized by wrapping an area region extending over a front lower side surface.

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