JP4904583B2 - Vehicle seat provided with a side airbag device - Google Patents

Description

  According to the present invention, an airbag device in which an airbag is accommodated in a back case is attached and arranged on one side portion of a seat back frame, and the front and side terminals of a trim cover that encloses the arrangement side of the airbag device are sewn together. The invention relates to a vehicle seat having a side airbag device that forms a rupture portion of a trim cover that accompanies the inflation and deployment of an airbag from a seam, and that disposes a webbing on a lid of a bag case as means for accelerating rupture of the seam. is there.

  Conventionally, a trim cover breakage part is formed along with inflation and deployment of an airbag from a seam obtained by stitching together the front and side terminals of a trim cover that encloses the arrangement side of the airbag device, and one end is trimmed. It is known to jointly sew at the seam that becomes the rupture part of the bag and to arrange a force cloth that winds and fastens the other terminal around the back frame on the lid of the bag case as means for accelerating the seam break (Patent Document 1). ).

  Usually, the airbag has a balloon-like inflated and deployed shape extending from the head of the seat to the waist. In addition, as a baffle, the end of the trim cover is ruptured from the portion corresponding to the approximate center of the airbag by stitching one end together with the seam that becomes the rupture portion of the trim cover in alignment with the approximate center of the airbag inflated and deployed in a balloon shape. A part that cuts out the seam is provided.

  A bag portion that inflates in the direction of the occupant's head, and a bag portion that inflates in the direction of the occupant's waist, instead of an air bag that exhibits a balloon-like inflated and deployed shape extending from the seat's head to the waist. It is intended to provide an airbag that inflates and deploys in a twin mountain shape.

For airbags having a twin mountain-like inflated and deployed shape, when a force cloth is provided for co-sewing the above-mentioned one end with a seam that becomes a breakage portion of the trim cover with the substantially one end of the airbag, It is not suitable for the seam portion that has been sewn together because the inflation pressure of the airbag acts slowly.
Japanese Patent Laid-Open No. 9-123860

  The present invention includes an airbag that inflates and deploys in a twin mountain shape from a bag portion that inflates toward the occupant's head and a bag portion that inflates toward the occupant's waist. An object of the present invention is to provide a webbing that is an effective seam breakage promoting means.

The invention according to claim 1 of the present application provides an airbag that inflates and deploys in a twin mountain shape from a bag portion that inflates toward the head of the occupant and a bag portion that inflates toward the waist of the occupant. A trim that is accommodated in a case to form an airbag device, the airbag device is attached to one side portion of the back frame, the airbag is inflatable and deployable through the opening of the back pad, and the airbag device is disposed on the side of the trim. The trim cover breaks along with the inflation and deployment of the airbag from the seam where the front and side ends of the cover are stitched together, and one end is stitched together with the seam that becomes the break of the trim cover. A vehicle seat equipped with a side airbag device in which a force cloth that is wound around and secured to a back frame is arranged on the lid of an airbag case as means for promoting breakage of the seam. ,
Equipped with a belt-shaped force cloth that is divided into two forks , one end of each band is stitched together with a seam that becomes the breaking part of the trim cover, the other end of each band is wrapped around the back frame and fastened, and each band-shaped part is bagged In addition to being disposed on the lid of the case, the webbing is disposed in accordance with the direction in which each back portion of the airbag is inflated.

The invention according to claim 2 of the present application is provided with a belt-like force cloth divided into approximately V-shaped bifurcations, and each of the substantially V-shaped front end sides is stitched together with a seam that becomes a rupture portion of the trim cover . The base side is wound around the back frame and fixed .

According to the vehicle seat including the side airbag device according to the present invention, the belt-like portions of the bifurcated force cloth are arranged on the lid of the bag case, and the airbag back portions are aligned with the direction in which the airbag is inflated. Since the baffle is disposed, even if the output of the inflator for inflating the airbag is set to be low, the area of each belt-shaped portion covered on the lid of the bag case is narrow. The resistance corresponding to the opening movement can be kept small , and each belt-like portion of the buffing can be reliably pulled by the opening movement of the lid. As a result , the inflation pressure of each back part can be reliably concentrated on the local area of the seam that becomes the rupture part of the trim cover. The portion can be effectively inflated and deployed toward the head of the seat and toward the waist of the seat.

  Referring to the accompanying drawings, FIG. 1 shows an assistant seat equipped with 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 seat back B, a front cover portion (cover portion for bank) 2a and a side cover portion 2b in which the break portion 3 of the trim cover 2 accompanying the inflation and deployment of the airbag covers the equipment side of the airbag device 1 The seam 2c is formed by stitching together the terminals.

  The airbag device 1 includes an inflator (not shown) for generating inflation gas, an airbag module including an airbag, and an impact sensor provided on the vehicle body side. As shown in FIG. 2, the airbag device 1 includes an airbag 1a and an inflator housed inside a case body 1b, and a case lid 1c that can be pressed and released by the inflation pressure of the airbag 1a is hinged to the case body 1b. The case storage type is equipped.

Airbag device 1 includes a case body 1b is attached to the side plate 4a of the back frame 4, the case body 1b of the case lid 1c a to face the opening 5a provided on one side portion of the back pad 5 to the external casing body 1b Is accommodated in the opening 5a, and the airbag 1a is assembled so that the airbag 1a can be inflated and deployed outward when the case lid 1c is opened.

  As described later, the airbag 1a includes a bag portion that inflates and expands in a twin mountain shape from a bag portion that inflates toward the head of the seat and a bag portion that inflates toward the waist of the seat. ing.

  For the airbag 1 a, a belt-shaped force cloth 6 that is divided into a substantially V-shaped fork is provided inside the trim cover 2. The force cloth 6 is formed of a material that is less stretched even when subjected to the inflation pressure of the airbag 1a, such as a polyester nonwoven fabric or cotton cloth. As the force cloth 6, a V-shaped base can be formed as a single sheet, or a combination of two belt-shaped cloths can be used.

The force cloth 6 has one end on each tip side co-sewn with a seam 2c that becomes the breaking portion 3 of the trim cover 2, and the other end on the base side is suspended from the back side of the back pad 5 together with the end of the side cover portion 2b. Since the wire 4b is hooked onto the retainer 4c of the back frame 4 and is fastened, the belt-like portions 6a and 6b are arranged on the case lid 1c so as to extend obliquely up and down as shown in FIG. ing.

  In the vehicle seat including the side airbag device configured as described above, when the impact sensor installed on the vehicle body side operates in response to a collision and an output signal is transmitted from the impact sensor to the inflator, the inflation gas is generated from the inflator. As a result, the airbag 1a is inflated and deployed under the output pressure of the inflator.

  When the air bag 1a is inflated, finally, as shown in FIG. 4, the air bag 1a starts to inflate from the front end side of each of the bag portions 10 and 11 having a twin mountain shape, and as the case lid 1c moves open, Since the expansion pressure of the back portions 10 and 11 is concentrated at the local portion of the seam where the belt-like terminals of the webbing 6 are sewn together, the back portion 10 and 11 are quickly cut out from the local portion of the seam 2c which becomes the breaking portion 3 of the trim cover 2.

The baffle 6 divides the belt-like portions 6a and 6b into substantially V-shaped bifurcations and is disposed on the lid of the case lid 1c. Therefore, even if the output of the inflator for inflating the airbag 1a is set low, Since the area of the band-like portions 6a and 6b covering the lid of the case lid 1c is narrow, the resistance corresponding to the opening movement of the case lid 1c can be kept small, and each band-like portion 6a and 6b can be opened by the case lid 1c. Pulls reliably with movement.

  As a result, the expansion pressure of each of the back portions 10 and 11 is surely concentrated on the local portion of the seam 2c that becomes the breaking portion 3 of the trim cover 2 to quickly cut out the local seam 2c, and subsequently, the breaking portion 3 is formed. Since the entire length of the seam 2c to be cut can be incised, each of the bag portions 10 and 11 of the airbag 1a can be effectively inflated and deployed toward the head of the seat and toward the waist of the seat.

  In addition to the webbing 6, each belt-like piece end is overlapped and stitched together at the seam 2 c forming the fracture portion 3, so another webbing 7 (see FIG. 1) having a substantially V shape is placed on the front surface. It can arrange | position inside the cover part 2a. The other end of the baffle 7 is pulled inside from the front side of the back pad 5 through the hanging hole 5b, and is hung together with the seat surface hanging portion 2d of the trim cover 2 by hanging the hanging wire 8 on the back spring 9. It can be fixed.

  The force cloths 6 and 7 are not easily stretched even if they are subjected to stress due to the inflation of the airbag 1a, so that they struggle and antagonize each other. Therefore, the stress due to the inflation of the airbag 1a is concentrated locally on the seam 2c. Since the pulling force is pulled strongly in the separating direction, the sewing thread of the part is instantaneously cut. Since the cutout of the sewing thread continuously extends in the length direction of the seam 2c due to the inflation pressure of the airbag 1a, the seam 2c necessary for inflating and deploying the airbag 1a can be quickly formed even if the output of the inflator is set low. And the incision is surely made.

1 is a perspective view generally showing a vehicle seat including a side airbag device according to the present invention. It is a partial expanded sectional view which shows the seat back which concerns on one form of the vehicle seat. It is explanatory drawing which shows the bundling provided as a promotion means of the fracture | rupture part formed in the trim cover of the vehicle seat. It is explanatory drawing which shows the expansion | deployment deployment state of the airbag in the vehicle seat.

DESCRIPTION OF SYMBOLS 1 Airbag apparatus 1a Airbag 1b, 1c Bag case 2 Trim cover 2a Front cover part of trim cover 2b Side cover part of trim cover 2c Seam 3 Breaking part 4 Back frame 5 Back pad 5a Back pad opening 6, 7 Force cloth

Claims (2)

An airbag device that accommodates an airbag that inflates and deploys in a twin mountain shape from a bag portion that expands toward the head of the seat and a bag portion that expands toward the waist of the seat, and forms an airbag device. The airbag device is attached to one side portion of the back frame, the airbag is disposed so as to be inflatable and deployable from the opening of the back pad, and the front and side terminals of the trim cover that encloses the placement side of the airbag device A force that forms a rupture of the trim cover as the airbag inflates and deploys from the stitched seam, and sews one end together with the seam that becomes the rupture of the trim cover, and wraps and fixes the other end to the back frame In a vehicle seat including a side airbag device that disposes cloth on a lid of an airbag case as means for promoting breakage of the seam,
Equipped with a belt-shaped force cloth that is divided into two forks , one end of each band is stitched together with a seam that becomes the breaking part of the trim cover, the other end of each band is wrapped around the back frame and fastened, and each band-shaped part is bagged A vehicle seat provided with a side airbag device, characterized in that it is arranged on a lid of a case and the blanches are arranged in a direction in which each back portion of the airbag is inflated. Equipped with a strip-shaped force cloth that splits into a roughly V-shaped bifurcated structure, each tip side of the approximately V-shape is sewn together with a seam that becomes the breakage part of the trim cover, and the base side of the approximately V-shape is wound around the back frame and fastened A vehicle seat comprising the side airbag device according to claim 1.

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