JP4904584B2 - Vehicle seat provided with a side airbag device - Google Patents

Description

  The present invention relates to a trim cover for attaching an airbag device having an airbag to one side portion of a back frame and arranging the airbag device inside an opening provided on a side portion of the back pad and enclosing the arrangement 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 fracture portion of a trim cover accompanying the inflation and deployment of an airbag from a seam obtained by stitching together front and side terminals.

  Generally, an airbag device having an airbag is attached to one side portion of the back frame and arranged inside an opening provided on the side portion of the back pad, and the front 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 fracture portion of a trim cover that accompanies inflation and deployment of an airbag from a seam obtained by stitching together terminals on the side and the side is known.

  In the side airbag device, an airbag including a bag portion that inflates and expands upward toward the head direction of the seat and a bag portion that inflates and deploys downward toward the waist portion of the seat is provided. It has been.

  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. From the front lower corner opening to the front lower corner opening edge, 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 possibility that it cannot expand and deploy 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).

Of the front and rear bundlings, the front bundling extends from the front opening of the opening to the front side of the back pad, and is provided from the front lower corner opening to the front lower corner opening edge. Absent. For this reason, even with the baffle, it is not possible to prevent the bag portion that is inflated and deployed downward toward the seated person's waist toward the back pad.
JP-A-8-258660

  In the present invention, an air bag comprising a bag portion that inflates and expands upward toward the head of the seat and a bag portion that inflates and deploys downward toward the waist of the seat is provided on one side of the back pad. A side airbag that can be inflated from the opening, prevents the bag part that inflates and deploys downward toward the waist of the occupant from entering the back pad, and can be inflated and deployed more stably than the trim cover breakage as a whole. It is an object of the present invention to provide a vehicle seat including the device.

The present invention includes an air bag device having a bag portion inflated and deployed upward toward the head direction of the seat's airbag comprising a bag portion to be inflated and deployed downwardly toward the waist direction of the seat's said The airbag device is disposed in the cavity of the opening provided on one side of the back pad and attached to one side of the back frame, and the front side and the side of the trim cover that encloses the side on which the airbag device is disposed. In the vehicle seat that forms the break portion of the trim cover accompanying the inflation and deployment of the airbag from the seam where the terminals are stitched together,
A back pad retaining cover comprising a rising frame covering the front lower corner opening of the opening and an overhanging edge covering the front lower corner opening edge of the opening is provided upright from the back frame, and the shape retaining cover is provided to the seat It is provided as a guide for a back portion that expands and expands downward toward the waist .

According to the vehicle seat including the side airbag device according to the present invention, the vehicle seat includes the rising frame that covers the front lower corner opening of the opening provided on one side of the back pad and the overhang edge that covers the front lower corner opening edge of the opening. A bag part that inflates and deploys downward toward the waist of the occupant when the airbag is inflated and deployed in order to provide the back pad shape retaining cover as a guide for the back part that inflates and deploys downward toward the occupant 's waist. The shape retaining cover can prevent the back pad from entering the back pad, so that the bag portion can be expanded smoothly toward the break portion of the trim cover together with the bag portion that expands and expands upward toward the head of the seat. .

  Hereinafter, referring to the attached drawings, FIG. 1 shows a seat back pad 2 having a side airbag device 1 from one side. The back pad 2 is provided with a vertically long opening 3 that is required for assembling the airbag case-accommodating airbag device 1 in a hollow shape. In the back pad 2, the front lower corner opening edge is covered with the shape retaining cover 4 from the front lower corner opening of the opening 3.

  The shape retaining cover 4 is formed of a synthetic resin or a thin metal plate, and has a rectangular shape that is substantially the same as the opening area of the opening 3 and is fixed to a side plate of a back frame, which will be described later, and a front portion of the opening 3. An L-shaped rising frame 4b covering the lower corner opening and an L-shaped protruding edge 4c covering the front lower corner opening edge of the opening 3 are formed.

  As shown in FIG. 2, the shape retaining cover 4 is arranged so that the inner surface side of the rising frame 4b is substantially flush with the inner surface of the mouth of the opening 3, and the substrate portion 4a is placed on the plate surface of the side plate. As shown, the fixing bolts 1c, 1d of the airbag apparatus 1 are inserted into the through holes 5b, 5c provided on the plate surface of the side plate 5a from the through holes 4d, 4e provided on the plate surface of the substrate portion 4a, and tightened with nuts. As a result, the air bag device 1 is sandwiched and fixed to the plate surface of the side plate.

  As shown in FIG. 3, the airbag apparatus 1 includes an airbag 1a and an inflator (not shown) accommodated in a bag case 1b that can be opened by the inflation pressure of the airbag 1a. As described later, the airbag 1a includes a bag portion (hereinafter referred to as an “upper bag portion”) that inflates and expands upward toward the head of the seat and a bag that inflates and deploys downward toward the waist of the seat. One of the parts (hereinafter referred to as “lower bag part”) is assembled.

  As described above, the airbag device 1 is bolted and fixed to the side plate 5a of the back frame 5, and the case lid of the bag case 1b faces outward from the opening 3 of the back pad 2 so that one side portion of the back pad 2 is provided. It is assembled to. The trim cover 6 includes a front cover (a bank cover is shown in the case of a bucket seat) 6b and a side cover 6c in which a breaking portion 6a accompanying the inflation and deployment of the airbag 1a covers the equipment side of the airbag device 1. 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 6 is divided into a front cover 6b and a side cover 6c from the seam forming the breaking portion 6a so as to be provided with force cloths 7 and 8 covering the airbag inflating and deploying region. it can. The force cloths 7 and 8 can be attached to the trim cover 6 by being integrally laminated by sewing or laminating inside the front cover 6b and the side cover 6b.

  Each of the force cloths 7 and 8 can be made 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 7 and 8, the bag part that inflates and expands upward toward the head direction of the seat and the bag part that inflates and deploys downward toward the waist part of the seat are initially inflated. The part corresponding to the center of the part 6a can be provided with a concave notch.

  One ends of the force fabrics 7 and 8 (see FIG. 3) are sewn together by a seam that forms the fracture portion 6 a of the trim cover 6. The other end of the force cloth 7 is suspended and secured inside the back pad 2 by a wire ring 10 that is suspended between the suspended portion 6d of the front cover 6b and the support spring 9 of the back pad 2. The other end of the force cloth 8 is tensioned and fixed to the retainer 5d of the back frame 5 with the wire ring 11 together with the suspended portion 6e of the side cover 6c. In FIG. 4, reference numeral 12 denotes 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 1a is shown in FIG. Expands and expands under 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 10 can be smoothly unfolded toward the fracture portion 6a of the trim cover 6 by preventing the upper bag portion 10 from entering the back pad 2.

  Even if the lower portion of the back pad 2 and the rear portion of the opening 3 are not rigid enough to resist the inflation and deployment of the airbag 1a from the open configuration of the lower portion and the rear portion, the inside of the front lower corner of the opening 3 Since the front lower corner opening edge is covered with the rising frame 4b and the overhanging edge 4c of the shape retaining cover 4, the shape retaining cover 4 serves as a guide to prevent the back pad 1 from being submerged. It can be smoothly developed toward the broken portion 6a.

  At the same time, the force cloths 7 and 8 receive the inflation pressure of the air bag 1a, 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 6a of the trim cover 6. The stress caused by the expansion of the material is instantly concentrated. For this reason, since the seam that becomes the breaking portion 6a is strongly pulled by the force cloths 7 and 8 and quickly cut out, the seam necessary for inflating and deploying the airbag can be incised quickly and reliably.

  As the force cloths 7 and 8, a portion corresponding to the center of the breaking portion 6 a is cut out in a concave shape, so that the seam that becomes the breaking portion 6 a is cut individually across the notch portions of the force cloth 7 and 8. Will come out. As a result, the upper bag portion 10 that is initially inflated and deployed toward the head direction of the seat and the lower bag portion 11 that is inflated and deployed toward the waist portion of the seat are individually inflated and deployed. The expansion and deployment directions of 10 and 11 can be determined stably.

It is a perspective view which expands and shows the shape retention cover of an airbag apparatus and a back pad from a seat back provided with the side airbag apparatus which concerns on this invention. It is a side view which shows the back pad for the seat back. 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 Airbag apparatus 2 Back pad 3 Opening part 4 Back pad shape retention cover
4b rising frame
4c Overhang edge 5 Back frame 6 Trim cover 6a Fracture part of trim cover

Claims (1)

A bag portion inflated and deployed upward toward the head direction of the seat's an air bag device having an air bag comprising a bag portion to be inflated and deployed downwardly toward the waist direction of the seat's the airbag apparatus Placed in the cavity of the opening provided on one side of the back pad and attached to one side of the back frame, and stitched the front and side terminals of the trim cover that encloses the arrangement side of the airbag device In the vehicle seat that forms the break portion of the trim cover accompanying the inflation and deployment of the airbag from the seam,
A back pad retaining cover comprising a rising frame covering the front lower corner opening of the opening and an overhanging edge covering the front lower corner opening edge of the opening is provided upright from the back frame, and the shape retaining cover is provided to the seat A vehicle seat provided with a side airbag device, which is provided as a guide for a back portion that inflates and deploys downward toward the waist portion of the vehicle.

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