JP3890695B2 - Ball for seat cover of seat with airbag device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a seat equipped with a side-impact airbag device, and more particularly to a seat cover edge that covers a seat equipped with the airbag device.
[0002]
[Prior art]
Conventionally, there is a vehicle seat structure disclosed in, for example, Japanese Patent Application Laid-Open No. 8-258660 as a vehicle seat equipped with this type of side airbag device. However, the seat cover structure disclosed in this publication is configured to directly sew the main skin and the side skin of the seat cover.
However, in general, it has been usual to sew and sew a sewing part between a main skin and a side skin of the seat cover with a bead for decoration to give a high quality feeling to the seat design.
[0003]
Therefore, a side-impact airbag when covering the seat cover 11 having a configuration in which a decorative bead is attached to the sewing portion of the main skin 12 and the side skin 13 of the seat cover 11 along FIGS. The vehicle seat 1 equipped with the device 5 will be described. The vehicle seat 1 includes a seat cushion 2 and a seat back 3, and the cross-sectional shape of the seat back 3 taken along the line AA is configured as shown in FIG. An airbag device 5 is attached to a predetermined position of the vertical frame on the door side of the seat back frame 4 of the seat back 3, for example.
[0004]
The airbag device 5 has a substantially cylindrical gas generator (inflator) 7 attached to the bottom of the storage container 6 on the rear side in the figure as in the prior art, and a folded airbag bag on the front side. The body 8 is accommodated and formed in a substantially flat box shape, and an ejection opening 9 is opened on the front side of the container 6. Thus, the seat back pad 10 is attached to the seat back frame 4 to which the airbag device 5 is attached, and the seat cover 11 is covered.
[0005]
The seat back pad 10 has a central main pad portion 10a and left and right side pad portions 10b formed integrally and is attached to the front side of the seat back frame 4, and the seat cover 11 is covered. The seat cover 11 includes a main skin 12 cut into a predetermined shape, left and right side skins 13 and a back and back skin 20, and a decorative bead 15 is sewn along a sewing portion 14 between the skins 12 and 13. It is worn.
[0006]
The decorative bead 15 is made of a synthetic resin material, and the bead core 16 and the fin portion 17 are integrally formed. The fin portion 17 is used to sew the main skin 12 and the left and right side skins 13 together. In order to smoothly deploy the airbag bag body 8 as shown in the drawing, one end side of the deployment auxiliary cloth 18 having a predetermined sewing width using a cloth that is difficult to extend from the side skin 13 is the side skin. 13 is sewn together to form a sewn portion 14. The seat cover 11 formed in this way is covered by the seat back pad 10 and a hook member 19 is attached to the other end of the deployment assisting cloth 18, and this hook member 19 is a part of the seat back frame 4. The deployment assisting cloth 18 is attached to the hook hanging portion 4a in a tensioned state. Moreover, the edge part of the side skin 13 is sewn on the back back skin 20 side.
[0007]
[Problems to be solved by the invention]
However, in the vehicle seat 1 equipped with the airbag device 5 in which the decorative rim 15 is integrally sewn and covered with the seat cover 11 as described above, the gas generator 7 is activated by a side collision, and the airbag When the bag body 8 starts to expand due to gas, the container side piece 6a side on the opposite side that is not attached to the frame of the storage container 6 is rotationally displaced counterclockwise around the base side by this expansion force, thereby assisting in deployment. The cloth 18 and the side skin 13 are bulged outward and the ejection opening 9 is expanded.
[0008]
The airbag bag body 8 is inflated from the opened opening 9, and this inflating is directed mainly toward the sewn portion 14 where the main skin 12, the side skin 13 and the decorative rim 15 are sewn. It is done. As a result, the sewing thread of the sewing portion 14 is broken and the airbag bag body 8 is inflated from the broken portion. The sewing portion 14 is one place and the decorative bead 15 is provided. Since it is intervened, it is uncertain whether or not the broken portion of the sewing thread is broken at the main skin 12 side or the side skin 13 side around the fin portion 17 of the decorative bead 15. As shown in FIG. 6, there is a problem that the airbag bag body 8 is in a state of straddling the decorative bead 15 and the airbag bag body 8 is not expanded to a predetermined shape.
[0009]
The present invention has been made to solve the above-described problems, and when an airbag bag body is inflated toward a sewn portion where a main skin, a side skin, and a decorative rim are sewn, an air bag is inflated. It is an object of the present invention to provide a bead for a seat cover of a seat with an airbag device that allows a bag bag body to bulge into a predetermined shape without straddling a decorative bead.
[0010]
[Means for Solving the Problems]
In order to solve the above technical problem, the present invention
The invention of claim 1 is a bead for a seat cover used for a seat with an airbag device in which the seat frame is equipped with an airbag device, and a seat pad is attached to the seat frame to cover the seat cover.
The decorative bead sewn between the seams of the seam of the cover of the seat cover that breaks when the air bag body of the air bag device is deployed is pre-determined integrally with the bead core by a synthetic resin material. The fin portion is formed at a predetermined interval in the direction in which the ball core extends and a plurality of cut grooves intersecting the direction are formed, and the fin portion is not formed on the cut portion and the ball core side. A configuration having a notch,
Decorative ball edges, forms a first sewn portion are sewn together form both epidermis and co sandwiching the welt in non cut portion formed on the fin portion, the cut portion of the fin portions of both epidermis one form a second sewn portion is stitched together with the out,
The width of the fin portion is a width that allows both the first and second sewn portions to be sewn, and the depth of the incision groove allows the second sewn portion to be sewn to the incised portion. Further, the depth is such that the degree of freedom of curvature is given to the ball core, and the interval between the cut grooves is set to a length that can secure the number of perforations that can satisfy the sewing strength in the second sewn portion. It is a bead for a seat cover of a seat with an air bag device.
[0011]
【The invention's effect】
According to the invention of claim 1, since the cut length of the cut groove is formed to be a cut length that gives a relatively free degree of curvature to the ball core during sewing, the ball core is meandering or the like. Accordingly, the followability is ensured and the seat cover can be easily sewn. The width of the cut portion is formed so as to ensure the number of perforations that can satisfy the sewing strength during sewing. Therefore, when the airbag bag body is inflated, the sewing thread at the first sewing portion breaks. Thus, the decorative rim can be restrained to one of the skins sewn by the second sewn portion, and the airbag bag body can be inflated into a predetermined shape, thereby fulfilling its service.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the present invention will be described with reference to FIGS. Note that the vehicular seat 21 of this embodiment is different from the vehicular seat 1 in the decorative bead 15 and the sewing portion 14, and the other components are configured in the same manner, so the same members are denoted by the same reference numerals. The description thereof will be omitted, and different parts will be described.
[0013]
FIG. 1 is a horizontal sectional view of a seat back of a vehicle seat 21. An airbag device 5 is attached to a vertical frame on the door side of the seat back frame 4, and a seat back pad is attached to the seat back frame 4. 10 is attached and the seat cover 22 is governed, and the seat cover 22 is formed by sewing the main skin 12, the left and right main side skins 13 and the back and back skins 20 in the same manner as in the prior art. A decorative bead 25 is attached to 31 and 32.
[0014]
The decorative bead 25 is made of a synthetic resin material as in the prior art. As shown in FIG. 3, the bead core 26 having a predetermined diameter and a hollow section 26a having a substantially cylindrical cross section, and the bead core 26 are provided. A strip-shaped fin portion 27 is integrally formed with a predetermined width h. The width h of the fin portion 27 is formed to be relatively longer (about 10 mm) than the conventional fin portion 17 (about 5 mm). In the longitudinal direction of the fin portion 27 formed in this manner, a cut groove 28 is formed at a predetermined interval p, and the fin portion 27 is formed in a cut portion 29 and a non-cut portion 30, and the cut length of the cut groove 28 is The length h1 is formed to have a cut length h1 that gives a relatively free degree of curvature to the ball core 26 during sewing, and the width of the cut portion 29 is the number of perforations that can satisfy the sewing strength during sewing. It is formed in a width that can be secured. The ratio of h and h1 is approximately 10: 6.
[0015]
The decorative bead 25 formed in this way is sewn between the main skin 12 and the left and right side skins 13 of the seat cover 22 as shown in FIG. The main skin 12 and the side skin 13 are formed by bending seam allowances 12a and 13a, respectively, and the airbag bag body 8 is smoothly deployed inside the side skin 13 so that a cloth that is harder to stretch than the side skin 13 is used. One end portion of the unfolded auxiliary cloth 18 is attached, and between the seam allowance portions 12a and 13a, first, the main skin 12 is formed with respect to the non-cut portion 30 formed in the fin portion 27 of the decorative bead 26 as shown in the figure. The seam allowance 12a, the seam allowance 13a of the side skin 13 and the end of the deployment aid cloth 18 are sewn together to form the first sewn part 31. Next, the seam allowance portion 13a of the side skin 13 and the end portion of the deployment aid cloth 18 are integrally sewn to the cut portion 29 of the fin portion 27 to form the second sewn portion 32.
[0016]
The seat cover 22 sewed with the decorative bead 25 attached in this way covers the seat back pad 10, and the hook member 19 at the other end of the deployment aid cloth 18 is the same as the conventional one in the seat back frame 4. The hook is engaged with the hook engaging portion 4 a, and the end portion of the side skin 13 is sewn to the back and back skin 20.
[0017]
Next, the operation of the sewn portion to which the decorative bead 25 is attached when the airbag device 5 is activated will be described with reference to FIG. First, when the gas generator 7 is activated, when the airbag bag 8 starts to inflate with gas, the container side piece 6a on the opposite side that is not attached to the frame of the storage container 6 is centered on the base side. The expansion assist cloth 18 and the side skin 13 are pushed outward in a bulging manner by turning counterclockwise, and the tension increases and the ejection opening 9 is expanded.
[0018]
Then, the airbag bag body 8 is inflated from the expanded opening 9, and the first inflated portion 31 in which the main skin 12, the side skin 13, and the decorative bead 25 are sewn mainly. And it bulges toward the second sewn portion 32. Here, as shown in an enlarged view in FIG. 2, in the second sewing portion 32, the seam allowance portion 13 a of the side skin 13 and the end portion of the deployment assist cloth 18 are integrally sewn to the cut portion 29 of the decorative bead 25. In addition, in the first sewn portion 31, the seam margin 12a of the main skin 12, the seam margin 13a of the side skin 13 and the end of the deployment aid cloth 18 are sewn together on the non-cut portion 30 of the decorative bead 25. Therefore, the inflated output of the airbag bag body 8 is concentrated on the first sewing portion 31, and the acting force due to the displacement of the container side piece 6a is also applied to the first sewing portion. Thus, the sewing thread of the first sewing portion 31 is broken, and the airbag bag body 8 is inflated into a predetermined shape from the broken portion.
[0019]
When the first sewn portion 31 is broken, the cut portion 29 of the decorative bead 25 is sewn together at the second sewn portion 32 with the seam allowance portion 13a of the side skin 13 and the end portion of the unfolding assist cloth 18. Therefore, since the decorative bead 25 is moved to the side together with the side skin 13 and the deployment aid cloth 18, the airbag bag body 8 is predetermined without straddling the decorative bead 25 as in the prior art. It can bulge into a shape and fulfill its service.
[0020]
As described above, the decorative bead 25 of the present embodiment forms the bead core 26 and the fin portion 27 having a predetermined width h in the longitudinal direction of the bead core 26 from the synthetic resin material as described above. The fin portion 27 has a structure in which a cut groove 28 is formed at a predetermined interval p in the longitudinal direction and a predetermined cut length h1, and a cut portion 29 and a non-cut portion 30 are provided on the edge core 26 side. Therefore, the cut length h1 of the cut groove 28 is formed to be a cut length h1 which gives a relatively free degree of curvature to the ball edge core 26 at the time of sewing. Accordingly, the followability can be ensured without sewing, and the seat cover 22 can be easily sewn.
Further, the non-incision portion 30 formed in the fin portion 27 is a first sewing portion 31 for sewing together the main skin 12, the side skin 13, and the unfolding auxiliary cloth 18 of the seam, and the cutting portion 29 is one side skin 13. Since the second sewing portion to be sewn with the deployment auxiliary cloth 18 is configured, the width of the cut portion 29 is formed so as to ensure the number of perforations that can satisfy the sewing strength at the time of sewing. When the airbag bag body 8 is inflated, the decorative bead 25 associated with the breaking of the sewing thread of the first sewing portion 31 is restrained on the side skin 13 side, and the airbag bag body 8 is inflated into a predetermined shape. Be able to fulfill their duties.
[0021]
In addition, in the said embodiment, although illustrated about the seat back 3, it is not limited to this, For example, it can apply also to the seat cushion 2. FIG.
[Brief description of the drawings]
FIG. 1 is a partial horizontal sectional view of a seat back in a seat with an airbag device.
FIG. 2 is an enlarged view of a circled portion in FIG.
FIG. 3 is a perspective view of a decorative bead.
FIG. 4 is a perspective view of a seat with an airbag device.
5 is a cross-sectional view taken along the line AA of FIG. 4 when the cover is covered with a seat cover to which a conventional decorative bead is attached.
FIG. 6 is an operation explanatory view of an airbag bag body when covered by a seat cover to which a conventional decorative rim is attached.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 21 Vehicle seat 2 Seat cushion 3 Seat back 4 Seat back frame 5 Air bag apparatus 22 Seat cover 12 Main skin 13 Side skin 25 Decoration edge 26 Ball edge core 27 Fin part 28 Cut groove 29 Cut part 30 Non-cut part 31 First sewn part 32 Second sewn part

Claims (1)

A bead for a seat cover used for a seat with an airbag device equipped with an airbag device on a seat frame, and a seat pad attached to the seat frame to cover the seat cover,
The decorative bead sewn between the seams of the seam of the skin of the seat cover that breaks when the air bag body of the air bag device is deployed is integrated with the bead core by a synthetic resin material. Forming a fin portion having a predetermined width in the fin portion, and forming a plurality of cut grooves intersecting with the fin portion at predetermined intervals in the direction in which the ball core extends, and the cut portion and the ball core side And having a non-cut portion
The decorative ball edges, forms a first sewn portion are sewn together form both epidermis and co sandwiching the welt in non cut portion formed on the fin portion, both in the cut portion of the fin portion form a second sewn portion is stitched together with one of the epidermis,
The width of the fin portion is a width that allows both the first and second sewing portions to be sewn, and the depth of the notch groove allows the second sewn portion to be sewn to the notched portion. In addition, the depth is such that the degree of freedom of curvature is given to the ball core, and the interval between the cut grooves is set to a length that can secure the number of perforations that can satisfy the sewing strength at the second sewn portion. The edge of the seat cover for the seat with the airbag device.

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