JPH10310018A - Seat with built-in air bag module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sew up the whole of a trim cover so that the cover can withstand the ordinary use, and provided an opening capable of positively spreading and opening due to the expansion-unfolding of an air bag, instead of expansion pressure of the air bag. SOLUTION: Sewing yarns 3 (3a) which is capable of being alternately laid over a fringe space 1c between the front cover part 1a and the side cover part 1b of a trim cover 1, which correspond to the position at which an air bag module is installed, and which have the strength withstanding the ordinary use, are provided so that they can be drawn out, and an opening of the trim cover is formed so that it can spread and open due to the expansion-unfolding of the air bag, as a result of drawing out the sewing yarns 3 (3a).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a trim cover having an airbag module provided with an airbag which can be inflated and deployed outward and housed inside one side of a seatback, and a trim cover corresponding to a mounting position of the airbag module. The present invention relates to an airbag module built-in sheet which forms a space between the edges of the front cover portion and the side cover portion as an opening portion of a trim cover accompanying expansion and deployment of the airbag.

[0002]

2. Description of the Related Art Conventionally, in such an airbag module built-in seat, a general portion of a trim cover is sewn from a sewing thread having a generally used strength, and a front cover portion and a side surface of a trim cover corresponding to a mounting position of the airbag module. Stitches between the edges of the cover portion are sewn from a weakly sewn thread that can be easily cut by the inflation pressure of the airbag by the inflator of the airbag module. One has been proposed (Japanese Unexamined Patent Publication No.
216820).

[0003] In the airbag module built-in sheet, since the broken portion of the trim cover due to the inflation and deployment of the airbag is formed by a sewing thread having a low strength, the sewing thread is easily cut even in normal usability. Sex is impaired.

Incidentally, the trim cover of the sheet is affected by the temperature environment so as to be firmly tightened in a low temperature environment. In order to satisfy the expansion / deployment performance of the airbag from a low temperature to a high temperature with respect to the trim cover, a strong output of the inflator which is not required at a normal temperature and a high temperature at a low temperature is required. It is preferable to appropriately set the output of the inflator so that the airbag can be softly expanded and deployed even at the low temperature. However, in order to cope with this, it is difficult to accurately set the trim cover by tearing the trim cover by the inflation pressure of the airbag and forming the broken portion of the trim cover depending on the strength of the sewing thread.

[0005]

According to the present invention, the trim cover is sewn as a whole so as to withstand normal usability, and is reliably expanded without depending on the inflation pressure of the airbag as the airbag expands and deploys. An object of the present invention is to provide an airbag module built-in sheet having an openable opening.

[0006]

In the airbag module built-in seat according to the first aspect of the present invention, the trim cover is alternately provided between the front cover portion and the side cover portion corresponding to the installation position of the airbag module. A sewing thread having a strength capable of withstanding ordinary usability can be pulled out and formed so as to be able to be expanded as an opening of a trim cover along with the inflation and deployment of the airbag after the sewing thread is pulled out. ing.

In the airbag module built-in seat according to a second aspect of the present invention, the sewing machine is connected to a sewing thread which is detachably wrapped between the edges of the front cover portion and the side cover portion of the trim cover corresponding to the mounting position of the airbag module. Then, an automatic sewing thread removing mechanism that operates by gas pressure before or substantially simultaneously with the operation of the airbag module in response to the output signal of the impact sensor is provided inside the seatback.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the accompanying drawings, FIG. 1 shows an assistant seat S in which an airbag module E is accommodated and mounted on the right side of a seatback B when viewed from the front side of a vehicle. In the assistant seat S, the seam 1c between the front cover 1a and the side cover 1b, which are the central seating surface and the bank surface of the trim cover 1 corresponding to the mounting location of the airbag module E, is used for inflating and deploying the airbag. The opening 1d is formed so as to be expandable.

[0009] airbag module E includes an air back e ₁ expandable deployed outward from the opening 2a provided on the side of the back pad 2 as shown in Figure 2, the module main body including inflation ter e ₂ . The trim cover 1 uses a wading cover in which a skin material, a wadding material, and a backing material are integrally laminated, and the general portion uses a thread of about 8 grit number that can withstand normal usability as upper and lower sewing threads. Are sewn by sewing.

In the trim cover 1 for the seat back, the side corresponding to the installation position of the airbag module E is provided with a sewing thread 3 having a strength enough to withstand normal usability between the edges 1c between the front cover 1a and the side cover 1b. They are sewn together by being provided so that they can be pulled out alternately and pulled out. The sewing thread 3 is sewn and inserted so as to simply meander between the edges 1c between the front cover portion 1a and the side cover portion 1b,
Alternatively, the trim cover 1 can be pulled out by applying a so-called “launcher stitch” on the inner surface side.

When the launcher stitch is applied, as shown in FIG. 3, a series of thread 3a zigzagly wound between the edges 1c between the front cover 1a and the side cover 1b, and the thread as shown in FIG. 3a can be sewn together with the stop threads 3b, 3c of the respective linear stitches which are inserted and supported at the turning portion. From the withdrawal of the sewing thread 3 (3a), a portion between the edges of the front cover portion 1a and the side cover portion 1b is formed to be openable as an opening portion of the trim cover 1 as the airbag expands and deploys.

The sewing thread 3 (3a) is continuously connected to the sewing thread 3 (3a) as shown in FIG.
As shown in the figure, an automatic sewing thread extracting mechanism 4 can be provided inside the seat back B. The automatic sewing thread extracting mechanism 4 can be provided inside the seat back B by fixing the main body to the support plate 6 which is protruded from the vertical rod portion of the seat back frame 5 by bolting.
Further, the automatic withdrawing mechanism 4 for the sewing thread may be equipped with a mechanism that can operate before or substantially simultaneously with the operation of the airbag module E.

[0013] The automatic withdrawal mechanism 4 for the sewing thread includes:
As shown in FIG. 5, a signal input unit 40 receiving an output signal from the impact sensor as an electric signal, and a gas generating agent 42 connected from the signal input unit 40 via a squib 41 are assembled in a casing 43, It is possible to equip a pretensioner unit provided with a piston 45 that operates under pressure inside a cylinder 45 that is internally connected to the casing 43. This pretensioner unit pulls out the towing cable 46 from the piston 44 and connects the pullable cable 3 (3a) which can be pulled out.
The airbag of the airbag module E can be operated more reliably and quickly than when the airbag is inflated and deployed by the inflator.

In the airbag module built-in seat configured as described above, when the sewing thread automatic extracting mechanism 4 is used,
When the impact sensor mounted on the vehicle body is operated, an output signal is transmitted to the sewing thread automatic extraction mechanism 4 together with the airbag module E. Signal input unit 4 of automatic extraction mechanism 4
When 0 receives the output signal from the impact sensor, the gas generating agent 42 is exploded by the squib 41 to reduce the gas pressure to the casing 4.
The piston 44 is actuated by flowing the fluid from 3 into the cylinder 45. When the piston 44 operates,
The towing cable 46 forcibly pulls and removes the sewing thread 3 (3a), so that the front cover 1a on the side where the airbag module E is installed and the edge 1c between the sides of the side cover 1b are inflated and deployed. Accompanying trim cover 1
The opening can be expanded as an opening.

The automatic withdrawal mechanism P for the sewing thread is
(3a) is pulled out faster than the airbag of the airbag module E inflates and deploys with the inflator, so the airbag inflates and deploys outward from the expanded opening 1d of the trim cover 1. be able to. Therefore, the airbag can be inflated and deployed without breaking the trim cover 1 by the inflation pressure of the airbag by the inflator in the airbag module built-in seat. Thus, the output of the inflator can be appropriately set.

It is preferable that at least the end stitched portion of the trim cover 1 between the central seating surface and the bank surface is firmly suspended and fixed so as to be able to resist the pulling force of the automatic sewing thread extracting mechanism 4. The hanging structure of the seam is shown in FIG.
As shown in the figure, the hanging bag 7 is overlapped and sewn on the terminal of the center seating surface and the bank surface of the trim cover 1, the listing wire 7a is inserted into the hanging bag 7, and the wisdom ring-shaped hook ring is provided. Is inserted through the hole 2b of the back pad 2 so that the listing wire 7a
And the cushion spring 8 should be hooked.

[0017]

As described above, according to the airbag module built-in seat according to the first aspect of the present invention, the trim cover corresponding to the mounting position of the airbag module is provided between the front cover and the side cover. A sewing thread having a strength capable of withstanding normal usability can be pulled out alternately and formed so as to be expandable as an opening of a trim cover due to the expansion and deployment of the airbag after the sewing thread is pulled out. As a result, the trim cover can be opened by pulling out the sewing thread without breaking by the inflation pressure of the airbag by the inflator. Therefore, even at a low temperature, the output of the inflator is appropriately set so that the airbag can be softened and expanded in a soft manner. be able to.

According to the airbag module built-in seat according to the second aspect of the present invention, the sewing thread is detachably wound between the front cover portion and the side cover portion of the trim cover corresponding to the installation position of the airbag module. By installing an automatic sewing thread removal mechanism inside the seat back that operates by gas pressure before or almost simultaneously with the operation of the airbag module in response to the output signal of the impact sensor, The airbag can be expanded and deployed at an appropriate gas pressure.

[Brief description of the drawings]

FIG. 1 is an overall perspective view showing an airbag module built-in seat according to the present invention.

FIG. 2 is a partially enlarged cross-sectional view showing a seat back of the airbag module built-in seat.

FIG. 3 is a partially omitted perspective view showing a removable sewing thread for sewing the trim cover of the airbag module built-in seat.

FIG. 4 is a partially omitted cross-sectional view showing the detachable sewing thread shown in FIG. 3;

FIG. 5 is a schematic configuration explanatory view showing an automatic extracting mechanism of a separable sewing thread shown in FIG. 3;

[Explanation of symbols]

1 Trim Cover 1a Front Cover 1b Side Cover 1c Between Edges of Front Cover and Side Cover 1d Opening of Trim Cover 3 (3a) Removable Sewing Thread 4 Automatic Sewing Thread Removal Mechanism B Seat Back E Airbag Module

Claims (2)

[Claims] An airbag module having an airbag that can be inflated and deployed outward is housed and mounted in one side of a seatback, and a front cover portion and a side surface of a trim cover corresponding to a mounting position of the airbag module. In the airbag module built-in sheet, which forms the gap between the edges of the cover as the opening of the trim cover as the airbag expands and deploys, it can be alternately laid between the edges of the front cover and the side cover of the trim cover. Airbag module-equipped seat, characterized in that a sewing thread having a strength capable of withstanding the airbag is provided so as to be able to be pulled out, and the gap between the edges can be expanded as an opening of a trim cover accompanying the inflation and deployment of the airbag after the sewing thread is pulled out. . 2. An air bag in response to an output signal of an impact sensor, wherein the sewing machine is connected to a sewing thread which is detachably wrapped between edges of a front cover portion and a side cover portion of a trim cover corresponding to a mounting position of the airbag module. 2. The airbag module built-in seat according to claim 1, wherein an automatic sewing thread removing mechanism that operates by gas pressure before or substantially simultaneously with the operation of the back module is provided inside the seat back.