JP2003127815A - Seat fitted with air bag module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seat fitted with an air bag module equipped with stay cloths and having no restriction of materials of a trim cover and sewing thread, in which the ruptural portion of the trim cover is cut open momentarily by the expanding pressure of the air bag. SOLUTION: From the stay cloths 14 and 15, tensile force caused by the expanding pressure of the air bag is applied to the ruptural portion 11a of the trim cover 11, wherein the acting point of the tensile force caused by the expanding pressure of the air bag is set to two places above and below the ruptural portion 11a close thereto by the stay cloths 14 and 15 sewn together with the ruptural portion 11a of the trim cover 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air bag module having an air bag module accommodated in an air bag case, which is inflatable and expandable outward by an output pressure generated by an inflator, in a side portion of a seat back. It concerns the improvement of the equipment seat.

[0002]

2. Description of the Related Art Conventionally, as a seat for an air bag module, a general part of a trim cover is sewn with a sewing thread which is usually used, and a front gusset portion and a side surface of a trim cover for enclosing the equipment side of an air bag module. It has been proposed to sew a gusset portion with a relatively weak strength sewing thread, and to form a seam with the weak strength sewing thread as a rupture portion which is cut by the inflation pressure of the air bag due to the output of the inflator (Japanese Patent Laid-Open No. H8-78350). −
216820).

In the air bag module equipped seat, the specifications are limited because the breakage portion of the trim cover depends largely on the materials such as the trim cover and the sewing thread.

On the other hand, as shown in FIG. 10, an air bag module 1 accommodating an air bag in an air bag case is provided so as to be inflatable and expandable by an output pressure generated by an inflator, and the equipment side of the air bag module 1 is covered. Front gusset 2a and side gusset 2b of trim cover 2
The break portion 2c of the trim cover 2 is formed from the seam of the trim cover 2 and the stretch cloths 3 and 4 with little elongation are attached to the trim cover 2
It has been proposed to sew it together with the broken portion 2c of the seat and install it on the inside of the trim cover 2, and wrap the airbag module 1 with the power cloths 3 and 4 to equip it on the side portion of the seat back B (for example, Japanese Patent Application Laid-Open No. 2000-242242). 2000-313302
issue).

[0005] The sack cloths 3 and 4 are continuous from one end that is sewn together with the break portion of the trim cover to the other end that is tension-fastened to the side frame of the seat back, in a strip shape.
Alternatively, as shown in FIG. 11, the short end side is sewn together with the break portion of the trim cover, and the long end side is attached to the side frame 5 of the seat back by tensioning (Japanese Patent Laid-Open No. 9-314344). ).

When the air bags case 3 and 4 are provided, the inflation pressure of the air bag acts on the power bags 3 and 4 from the lid of the air bag case as the air bag case is opened by the inflation pressure of the air bag. The force cloths 3 and 4 are pressed and pulled by the lid of the airbag case, and the tensile force acts on the fractured portions of the trim cover from the pressure cloths 3 and 4, so that the fractured portions of the trim cover are affected by the inflation pressure of the airbag. It is incised.

In the air bag module equipped sheet, the power cloths 3 and 4 are sewn together with the broken portion of the trim cover at one place of a predetermined length corresponding to the central portion of the broken portion.
When the tensile force is applied to the break portion of the trim cover by the cloths 3 and 4, the incision is started from the central position of the break portion as shown in FIG. Therefore, the fractured portion cannot be instantly incised over the entire length.

[0008]

SUMMARY OF THE INVENTION The present invention is an air bag that is equipped with a sash cloth and can be instantly incised at the ruptured portion of the trim cover by the inflation pressure of the air bag without being restricted by the material of the trim cover or the sewing thread. The purpose is to provide a modular equipment seat.

In addition to the above, an object of the present invention is to provide an air bag module-equipped sheet which is equipped with a power cloth and in which an air bag module can be easily assembled.

[0010]

In the air bag module equipped sheet according to the first aspect of the present invention, the air bag is accommodated in the air bag case such that the air bag can be inflated and expanded outward by the output pressure generated by the inflator. Attach the air bag module to the side frame of the seat back, and form a rupture part of the trim cover corresponding to the open side of the air bag case from the seam of the trim cover that wraps the equipment side of the air bag module, and there is little stretch Attach the strength cloth to the inside of the trim cover by sewn together with the breaking part of the trim cover at one end, wrap the airbag module with the strength cloth, and fasten the strength cloth to the side frame of the seat back at the other end by pulling and fastening. The tensile force due to the inflation pressure of the air bag acts on the ruptured part of the trim cover from the cloth. In, the webbing is sewn and rupture of the trim cover, and is configured by setting the point of action of the tensile force due to inflation pressure of the air bag vertically toward two positions of the breaks.

In the air bag module-equipped sheet according to claim 2 of the present invention, the air bag is made by sewn together with the breaking portion of the trim cover for a predetermined length of the upper and lower portions excluding the predetermined length of the central portion. It is configured by setting the points of action of the tensile force due to the expansion pressure at two locations above and below the fracture portion.

In the air bag module equipped sheet according to claim 3 of the present invention, a piece of sash cloth is sewn together with the breaking portion of the trim cover for a predetermined length of the upper and lower portions except for the predetermined length of the central portion. It is provided for wrapping the lid side of the airbag case, and is also provided with a piece of webbing for sewing the entire length together with the break portion of the trim cover for wrapping the lid of the airbag case in reverse.

In the air bag module equipped sheet according to a fourth aspect of the present invention, one piece of webbing which is sewn together with the breaking portion of the trim cover within the length range is provided for covering the lid side of the air bag case. At the same time, it is configured by including a single piece of webbing that is sewn together with the broken portion of the trim cover over the length on the encapsulating side opposite to the lid of the airbag case.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Referring to FIGS. 1 to 9, hereinafter, FIG. 1 shows a Japanese vehicle equipped with an airbag module 10 in a longitudinal direction on the right side of a seat back B when viewed from the front side of the vehicle. Shows the assistant sheet for specifications. In the seat back B, the rupture portion 11a of the trim cover 11 due to the expansion and deployment of the airbag is a front gusset portion 11b that wraps the equipment side of the airbag module 1 (in the case of a bucket seat, a cover portion that wraps the bank portion). ) And the side gusset portion 11c.

The air bag module 10 is provided with an inflator and an air bag (not shown), and is constructed so that the air bag can be inflated and deployed by being operated by an impact sensor equipped on the vehicle body side. As shown in FIG. 2, the air bag module 10 accommodates an air bag in an air bag case 10a that is inflatable and expandable outward by an output pressure generated by an inflator, and opens a lid 10b by the air bag inflation pressure. Possible hook 10
It is equipped with a case housing type that is latched and sealed by c.

The airbag module 10 is assembled in the cavity 12b provided on the side portion of the back pad 12a so that the opening side of the airbag case 10a by the lid 10b corresponds to the break portion 11a of the trim cover 11,
The airbag case 10a is attached to the seat back frame 13
The sheet is fixed by bolting to the side plate 13b of a, wrapped with two sackcloths 14 and 15 sewn together with the break portion 11a of the trim cover 11 at one end, and covered by the side gusset portion 11c of the trim cover 11. It is equipped on the side of back B.

The bracelets 14 and 15 are formed by folding back the respective ends as shown in FIG. 3 to the front gusset portion 11 of the trim cover 11.
b and the terminal gusseted portion of the side gusset portion 11c from the outside,
Attach the sewing thread 16 near the folded-back portions of the sackcloth 14 and 15
Since it is sewn together with a, the broken portion 1 of the trim cover 11
Sewn to form 1a. In addition, the front gusset portion 11b and the power cloth 14 and the side gusset portion 11c and the power cloth 1
5 is sewn together with suture threads 16b, 16c near the tip of the folded terminal and sewn so as not to separate even after tearing the breaking portion 11a.

The trim cover 11 is sewn in the shape of an unlined bag by sewing with upper and lower sewing threads of about 8 in number, which can endure normal usability, as a whole. The general part of the trim cover 11 sewes threads with a count of about 8 as upper and lower sewing threads, while the breakage part 11a of the trim cover 11 has a thread with count of about 8 and a thread with count of about 20. Since it is sewn as the upper and lower sewing threads, it can be easily sewn and sewn while maintaining the strength that can withstand normal usability.

As the strength cloths 14 and 15, materials such as polyester non-woven fabric and cotton cloth which have a small elongation even when subjected to the inflation pressure of the air bag are provided. The sword cloth 1
The break portion 11a of the trim cover 11 is provided with
The points of action of the tensile force with respect to are set at two positions near the top and bottom of the breakage portion 11a. The point of application of this pulling force is to combine two pieces of cloth material that have been cut into upper and lower parts to form strength cloths 14 and 15, align one end of each cloth material with each other, and sew together with the break portion 11a of the trim cover 11. You can also set it by doing.

In the illustrated embodiment, as shown in FIG. 4, the tension action point sewes the predetermined length of the upper and lower portions 15b and 15c together with the broken portion of the trim cover except for the predetermined length of the central portion 15a. It is set at two places on the upper and lower sides of the breaking portion with a piece of power cloth 15. The webbing 15 covers one side of the case from the lid 10b of the air bag case 10a, and the other webbing 14 is a single piece whose entire length is sewn together with the broken portion of the trim cover. Since the other side of the air bag case 10a is covered, the points of action of tension are set at two locations near the top and bottom of the break.

The webbings 14 and 15 are provided on the side opposite to the side where the pulling wires 17 and 18 formed of rigid wire such as hard steel wire or piano wire as shown in FIG. In order to prepare for other terminals, pull wires 17 and 18 are provided behind the side plate 13b on the seat back frame 13 side.
It is tensioned and fixed by pulling it into the hollow portion 12b of the back pad 12a (see FIG. 2) by entwining it with the retaining bar 19 which is suspended and fixed in the axial direction of a.

Each pulling wire 17, 18 is composed of
Support shaft portions 17a, 18a having a length corresponding to the end width of 15
And arm portions 17b, 17c, 18b, 18c bent in parallel from both sides of the support shaft portions 17a, 18a, and hook portions 17d, 17e, 18d, 18e bent from the shaft ends of the arm portions 17b, 17c, 18b, 18c. And lock portions 17f, 17g, 18f, 18g bent from the shaft ends of the hook portions 17d, 17e, 18d, 18e.

In the structure, the lock portions 17f, 17g,
18f and 18g are hooks 17 on one side 17f and 17g.
Bend laterally from d and 17e, and the other 18f and 18g
Are formed so as to be intertwined with each other by bending the hooks in the vertical direction outside the hook portions 18d and 18e. Further, the support bar 19 has an axis longer than the distance between the parallel arm portions 17b, 17c, 18b, 18c of the pulling wires 17, 18, and the pulling wires 17, 18 are hooked by the hook portions 17d, 17e, 18d, 18e. The V-shaped valley bent portions 19a and 19b that can be stopped are provided on the axis.

The trim cover 1 is provided with the respective components.
Prior to covering 1 with the back pad 12a, the air bag module 10 is attached and fixed to the plate surface of the side plate 13b. Next, one of the power cloths 14 provided on the trim cover 11 is drawn into the hollow portion 12b of the back pad 12a from one side portion of the airbag case 10a, and the other power cloth 15 is pulled in the lid 10 of the air bag case 10a.
The air bag module 10 is wound around the other side from b and drawn into the cavity 12b of the back pad 12a.
Wrap the cloth with sackcloth 14,15.

After that, the pulling wires 17 and 18 are entwined with each other from the inside of the back pad 12a behind the side plate 13b. The pull wires 17 and 18 are
The hook portions 17d, 17e, 18d, 18e are hooked on the axis of the support bar 19 so that the valley-bent portion 19 of the support bar 19 is caught.
a, 19b, the lock portions 17f, 17
Engagement of g, 18f, and 18g prevents them from being entangled.

In the pulling wires 17 and 18, the hook portions 17d, 17e, 18d and 18e are hooked on the axis of the support bar 19, and the lock portions 17f, 17g and 18 are provided.
Since f and 18g are engaged with each other, it is possible to stably and reliably prevent entanglement so as not to disengage from the support bar 19, and tension supports 14 and 15 to counteract the inflation pressure of the air bag. After the assembling of the power cloths 5 and 6, the back pad 1 including the air bag module 10 as usual.
The trim cover 11 may be covered so as to cover the entire surface of 2a.

In the air bag module-equipped sheet thus constructed, each one of the woven fabrics 14, 15 is used.
The trim cover 11 is sewn to the break portion 11a of the trim cover 11,
The air bag module 10 is formed by the bracelets 14 and 15.
Wrapping the whole of the wrapping cloth and pulling the webbing 14 and 15 on the wire 1
Since the air bag module 10 is assembled by being tension-supported by the members 7 and 18, the air bag module 10 can be easily assembled and mounted on the side portion of the seat back B even if the power cloths 14 and 15 are provided.

In the air bag module-equipped sheet, when the air bag case 10a is opened by the inflation pressure of the air bag, the inflation pressure of the air bag acts on the pressure cloths 14 and 15 from the lid 10b of the air bag case 10a. 14 and 15 are pressed and pulled by the lid 10b of the airbag case 10a, and the pulling force is applied to the breaking portion 1 of the trim cover 11 by the webbing 14 and 15.
Can act on 1a.

The pulling force is obtained by the air bag case 10.
The upper and lower portions 15 sewn together with the breaking portion 11a of the trim cover 11 by the force cloth 15 pressed by the lid 10b of a.
As shown in FIG. 6, the breaking portion 11a of the trim cover 11 starts the incision from the upper and lower positions of the entire length and spreads from the respective positions to the upper and lower portions, so that the breaking portion 11a acts on the breaking portions 11a. The whole length of can be incised in a short time.

The tensile force is generated by the upper and lower parts 15b and 15c.
Since the force cloth 15 sewn to the break portion 11a of the trim cover 11 over a predetermined length is pressed by the lid 10b of the air bag case 10a, it is directly pressed by the lid 10b of the air bag case 10a. The force cloth 15 is applied to the broken portion 11a of the trim cover 11 to concentrate the action.

At this time, the webbing 14 is pulled by the webbing 15. The webbing 14 is sewn together with the breaking portion 11a of the trim cover 11, so that the webbing 15 is pulled.
The pulling force from the sewn cloth 14 is received by the entire length of the sewn cloth 14 and stretches the entire length of the breaking portion 11a in the opening direction.
Since the tensile force from 5 can act on the entire length of the breaking portion 11a, it can be efficiently propagated up and down from the two incision start positions.

Due to the pulling action of the webbings 14 and 15,
Even if the inflation pressure of the air bag 10d by the inflator is set low, the break portion 11a of the trim cover 11 can be incised in a short time. Therefore, as shown in FIG. 7, the airbag 10d is rapidly inflated and expanded outward from the airbag case 10a by the output pressure generated by the inflator. In addition, the broken portion 11 of the trim cover 11
Even if a is incised, the front gusset portion 11a of the trim cover 11
The side cloth gusset portion 11b and the side cloth 1 are sewn together at their ends.
Since it can be kept continuous at 4, 15, it can prevent the seat back B from rolling back and forth.

Of the sackcloth 14 and 15, the sackcloth 15 is provided by being sewn together with the breaking portion 11a of the trim cover 11 within the length range, while the sackcloth 14 is broken as shown in FIG. If the one having the cloth portions 14a and 14b (see diagonal lines) that are sewn together with the break portion of the trim cover beyond the length of the portion is provided, the end side of the front gusset portion 11a due to the pulling force from the slack cloth 15 is provided. Since it is possible to prevent loosening or tearing and to promote the breaking of the sewing thread, the entire length of the broken portion can be surely cut.

Regarding the cloth portion of the cloth 14 which exceeds the length of the breaking portion, in the type in which the sewing line 11d extending from near the upper end of the breaking portion 11a to the upper side of the side gusset portion 11c is provided as shown in FIG. Since the sewing line 11d can prevent the front side gusset portion 11b from being loosened or cut off at the end side, as shown in FIG.

In the above-described embodiment, the trim cover 1
The breakage portion 11a of No. 1 was described based on the case where it is formed from the seam of the front side gusset portion 11b and the side face gusset portion 11c that wrap the equipment side of the airbag module 1, but the breakage portion 11a of the trim cover 11 is described below. It can also be applied to a case where the airbag case 10a is provided close to the open position of the lid 10b and provided within the area of the side face gusset portion 11c.

[0036]

As described above, according to the air bag module-equipped sheet according to the first aspect of the present invention, the action of the pulling force due to the inflation pressure of the air bag is provided by the tie cloth that is sewn together with the break portion of the trim cover. Since the points are set at two positions near the upper and lower sides of the break portion, when the force cloth acts on the break portion of the trim cover under the tensile force due to the inflation pressure of the airbag, the incision is made from the upper and lower positions of the full length of the break portion 11a of the trim cover. By starting and spilling each position up and down, there are no restrictions on the material of the trim cover or sewing thread,
Further, even if the inflation pressure of the airbag caused by the inflator is set to be low, the broken portion of the trim cover can be instantly incised by the inflation pressure of the airbag.

According to the air bag module equipped sheet according to the second aspect of the present invention, by using the woven fabric which sewes the predetermined length of the upper and lower portions except the predetermined length of the central portion together with the break portion of the trim cover, Since the points of action of the tensile force due to the inflation pressure of the airbag are set at two locations above and below the break, the points of action of the tensile force due to the inflation pressure of the airbag can be set at two locations above and below the fracture with a simple structure. .

According to the air bag module equipped sheet according to the third aspect of the present invention, the force of one sheet for sewing the predetermined length of the upper and lower parts together with the break portion of the trim cover except the predetermined length of the central part. Since the cloth is provided for the lid side wrapping of the airbag case, and a piece of sewn cloth that sewes the entire length together with the break part of the trim cover is provided for the reverse wrapping from the lid of the airbag case, The tensile force due to the inflation pressure is concentrated on the break of the trim cover by the pressure cloth directly pressed by the lid of the air bag case, so that the break of the trim cover can be instantly cut by the inflation pressure of the air bag. .

According to the air bag module equipped sheet according to the fourth aspect of the present invention, one piece of woven cloth which is sewn together with the break portion of the trim cover within the length range is used for covering the lid side of the air bag case. In addition, the end of the front gusset part is unraveled or shredded because the wrapping side opposite to the lid of the airbag case is provided with one piece of sewn cloth that is sewn together with the broken part of the trim cover over the length. It is possible to prevent it from coming out and to make sure that the broken portion of the trim cover is incised by the inflation pressure of the air bag.

[Brief description of drawings]

FIG. 1 is a perspective view showing a seat equipped with an airbag module according to the present invention.

FIG. 2 is a partial cross-sectional view showing the seat back of FIG. 1 along the line AA.

FIG. 3 is an explanatory diagram showing a terminal sewing structure of a trim cover and a stilt cloth that covers the seat back of FIG. 1.

FIG. 4 is an explanatory view showing an attachment structure of a webbing provided in the airbag module equipped seat of FIG.

5 is an explanatory view showing an assembling structure of a wire for tension-fastening the webbing of FIG.

FIG. 6 is an explanatory diagram showing a state in which the trim cover is started to be broken by the webbing of FIG. 4;

FIG. 7 is an explanatory view showing a breakage of the trim cover and an inflated and expanded state of the airbag by the webbing of FIG.

FIG. 8 is an explanatory view showing an attachment structure of a webbing according to another embodiment of FIG.

FIG. 9 is an explanatory diagram showing a structure for attaching a webbing according to another embodiment of FIGS. 4 and 8;

FIG. 10 is a perspective view showing an air bag module equipped sheet according to a conventional example.

11 is an explanatory view showing a structure for attaching a webbing provided on the seat for airbag module of FIG.

FIG. 12 is an explanatory diagram showing a state in which the trim cover is started to be broken by the webbing of FIG. 11;

[Explanation of symbols]

10 Air bag module 10a air bag case 10b Air bag case lid 11 Trim cover 11a Broken part of trim cover 11b Front gusset of trim cover 11c Side gusset of trim cover 12a back pad 12b Back pad cavity 13a, 13b Side frame 14,15 rug 15a Central part of sash cloth 15b, 15c Upper and lower parts of sash cloth

Claims (4)

[Claims] 1. An air bag module, which is housed in an air bag case so that the air bag can be inflated and expanded outward by an output pressure generated by an inflator, is attached to a side frame of a seat back, and the equipment side of the air bag module is attached. From the seam of the trim cover to be wrapped, form a break in the trim cover that corresponds to the open side of the airbag case, and sew a stretch cloth with little stretch together with the break in the trim cover at one end and inside the trim cover. In addition to wrapping the air bag module with sash cloth, the sash cloth is attached to the side frame of the seat back by tension at other terminals, and the tensile force due to the inflation pressure of the air bag acts on the ruptured part of the trim cover from the sash cloth. In the seat with the air bag module, use a force cloth that is sewn together with the broken part of the trim cover. , Air bag module equipped sheet, characterized in that setting the point of action of the tensile force due to inflation pressure of the air bag vertically toward two positions of the breaks. 2. The point of action of the tensile force due to the inflation pressure of the air bag is set above and below the fractured portion by a tie cloth that sewes the predetermined lengths of the upper and lower portions together with the fractured portion of the trim cover except for the predetermined length of the central portion. The air bag module equipped seat according to claim 1, wherein the seat is provided at two places near each other. 3. A piece of webbing for sewing a predetermined length of upper and lower parts together with a breaking portion of a trim cover except a predetermined length of a central part for covering the lid side of an air bag case and having a total length. The airbag module equipped sheet according to claim 1, further comprising: a piece of webbing which is sewn together with the break portion of the trim cover for wrapping from the lid of the airbag case. 4. The breakage portion of the trim cover and one piece of webbing that is sewn together within the length range are provided for covering the lid side of the air bag case, and the breakage portion of the trim cover and the breakage portion exceeding the length are both provided. The air bag module equipped sheet according to claim 3, wherein a single piece of sewn fabric to be sewn is provided on the envelope side opposite to the lid of the air bag case.