JP2007290615A - Vehicle seat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accomplish preferable compatibility of relaxing of an impact at inflation of an inflation member provided on a seat part with suppression of reduction of an inner pressure of the inflation member, in a vehicle seat aiming at avoidance of a submarine phenomenon. <P>SOLUTION: In an airbag 22 provided on a lower and front side of the seat part 1, a vent hole 24 is released to a space accompanying with starting of inflation, and the vent hole 24 is closed by abutment of the airbag 22 with a peripheral member accompanying with variation of a shape after it, specifically abutment with a front side inner wall 14b of a seat pan 14, i.e., an inner side surface of an inflation member storage part. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vehicle seat that is mainly mounted on a vehicle such as an automobile, and more particularly, to an improvement in a vehicle seat having a structure that suppresses forward slip of a seated passenger.

Mainly in vehicles such as automobiles, when a large impact is applied due to a collision from the front of the vehicle, the body of the passenger sitting on the seat sinks and tries to move the passenger forward It is known that there is a possibility that a so-called submarine phenomenon may occur in which a passenger slides forward so as to pass under a seat belt due to inertial force. Therefore, conventionally, as a vehicle seat that suppresses the occurrence of such a submarine phenomenon, the thigh of the occupant is inflated by filling an expansion member provided at the lower part of the lower part of the seat where the occupant is seated. A seat or the like in which the lower surface of the vehicle is pressed toward the rear of the vehicle has also been proposed (see, for example, Patent Document 1). By adopting such a seat structure, the above-described sinking of the occupant when a large impact is applied from the front of the vehicle is suitably suppressed. Moreover, in this vehicle seat, when the expansion of the expansion member proceeds, a part of the expansion member is opened by the internal pressure, and the gas filled therein is released to the outside through the opening, so the expansion amount is naturally limited. In addition, an impact generated when the expansion member expands is also mitigated.
Special table 2003-517966 gazette

  By the way, in the expansion member used in the conventional vehicle seat, after the internal pressure reaches the maximum value, the impact during the expansion can be alleviated through the opening. The gas is released through the opening, and the internal pressure decreases. On the other hand, in order to more suitably suppress the occurrence of the submarine phenomenon described above, it is desirable to suppress the decrease in the internal pressure as much as possible even after the internal pressure of the expansion member reaches the maximum value. However, in the above conventional vehicle seat, when the expansion member is opened, only the amount of gas corresponding to the opening area is released, so the gas release rate does not change, and the internal pressure of the expansion member is adjusted. It was difficult to do.

  The present invention has been made in view of the above-described conventional situation, and an object of the present invention is to achieve both the relaxation of the impact during expansion of the expansion member provided on the seat and the suppression of the decrease in internal pressure of the expansion member. An object of the present invention is to provide a vehicle seat capable of achieving the above.

  In order to solve the above-mentioned problem, the invention according to claim 1 is provided with an inflating member that expands by filling of gas ejected based on the driving of the inflator at the lower part of the seat portion where the passenger sits, and this inflating member In the vehicle seat having a structure in which the tip of the seat portion is lifted based on the expansion of the seat, the interior of the inflation member is communicated with the space through the opening as the inflation starts, and thereafter The gist is that an internal pressure adjusting port that naturally adjusts the internal pressure of the expansion member is provided at a position where the opening is closed as the shape changes.

  According to the above configuration, when the expansion of the expansion member is started, the interior of the expansion member communicates with the space through the opening serving as the internal pressure adjusting port. As a result, the impacts and the like that occur are mitigated. On the other hand, according to the same configuration, when the expansion of the expansion member proceeds or when the expansion is completed, the opening serving as the internal pressure adjusting port is closed along with the shape change. In such a state, the outflow of gas from the opening is suppressed, and as a result, a decrease in the internal pressure of the expansion member is also suppressed. Accordingly, it is possible to achieve both the relaxation of the impact during expansion of the expansion member provided at the lower part of the seat and the suppression of the decrease in internal pressure of the expansion member. Here, “closed” means that at least a part of the opening serving as the internal pressure adjusting port is closed, and includes all forms in which the gas outflow area as the internal pressure adjusting port is reduced.

  As an aspect in which the opening serving as the internal pressure adjusting port is closed as described above, the opening serving as the internal pressure adjusting port is expanded in accordance with the shape change due to expansion of the expansion member. The structure which is blocked | closed by contact | abutting with the peripheral member of a member is mention | raise | lifted.

  According to a third aspect of the present invention, in the vehicle seat according to the second aspect of the present invention, an expansion member accommodating portion that is made of a rigid material and accommodates the expansion member together with the inflator is provided at the lower front side of the seat portion. Thus, the internal pressure adjusting port is brought into contact with the inner side surface of the expansion member accommodating portion and the opening thereof is closed as the shape of the expansion member changes after the expansion starts.

  According to a fourth aspect of the present invention, in the vehicle seat according to the second aspect, a plate-like frame that is a skeleton member is provided at a lower portion of the seat portion, and the internal pressure adjusting port is formed by the expansion member. With the change in shape after the start of expansion, the gist is that the opening abuts against the surface of the frame.

  Usually, the vehicle seat is provided with a housing portion for accommodating the expansion member and a frame as a skeleton member for ensuring the strength thereof, and also in the seat portion of the seat for improving the seating comfort. A cushion or the like is provided. Therefore, in many cases, it is not possible to secure a sufficient arrangement space required for separately providing a member for closing the opening. In this regard, in the configuration according to claim 3 or claim 4 described above, an expansion member housing portion or a peripheral member such as a frame that is generally provided in a vehicle seat comes into contact with the expansion member to serve as an internal pressure adjustment port. Since the configuration in which the opening is closed is adopted, it is not necessary to provide a new member for closing the opening, and the realization thereof is easy.

  According to a fifth aspect of the present invention, in the vehicle seat according to any one of the second to fourth aspects, the peripheral member of the internal pressure adjusting port accompanying a change in shape of the vehicle after the expansion of the expansion member is started. The contact is made by pressing from the seat portion side after expansion of the inflatable member in cooperation with the own weight of the seat and the own weight of the passenger seated on the seat.

  In this configuration, the seat sinks due to the deformation of the seat and the weight of the passenger sitting on the seat, that is, the reaction force when the expansion member presses the thigh of the passenger. The opening which is the internal pressure adjusting port of the expansion member is closed along with the sedimentation, that is, the pressing from the seat side. For this reason, since the reaction force acting on the expansion member is larger as the passenger's weight is heavier, the opening is closed earlier. On the other hand, as the passenger's weight is lighter, the opening is delayed. In general, it is desirable for a light weight passenger to further reduce the impact of the expansion member than a heavy weight passenger. In this respect, according to the same configuration, as described above, since the time when the opening is blocked by the contact between the expansion member and the peripheral member is naturally adjusted according to the physique of the occupant, the internal pressure of the expansion member is adjusted. Is performed in a more desirable manner.

The gist of the invention according to claim 6 is that, in the vehicle seat according to any one of claims 1 to 5, the inflatable member is a woven fabric airbag.
Such a woven fabric airbag can be used as the inflating member. As the air bag made of this woven fabric is inflated, gas flows out to the outside through the gap between the woven fabric itself. Since the shape change also becomes more flexible, the degree of freedom of the contact mode between the airbag and, for example, the peripheral members thereof is increased, and the internal pressure adjusting port is also more accurately closed due to the contact. It becomes like this.

  According to a seventh aspect of the present invention, in the vehicle seat according to the sixth aspect of the present invention, a sealing member for assisting the closing of the opening is provided around the opening serving as the internal pressure adjusting port of the woven fabric airbag. The gist is that it is provided.

  As described above, when a woven fabric airbag is employed as the inflating member, the flexibility of the airbag itself increases, for example, the degree of freedom in contact with the peripheral member, and the internal pressure adjusting port is closed. Will certainly be enhanced. However, on the other hand, although the internal pressure adjusting port is closed, this is based on, for example, simple contact with the peripheral member. The occlusion around the internal pressure adjustment port is not always sufficient. In this regard, if a sealing member is provided around the opening serving as the internal pressure adjusting port as in the configuration of the seventh aspect, the adhesiveness between the opening and, for example, the peripheral member through the sealing member, that is, the blocking property is provided. This further increases the pressure of the airbag, and the reduction in the internal pressure of the airbag can be more suitably suppressed.

  According to the vehicle seat of the present invention, the submarine phenomenon occurs, i.e., seating, while achieving both the mitigation of impact during expansion of the expansion member provided in the seat and the suppression of the decrease in internal pressure of the expansion member. It is possible to accurately suppress the forward slip of the occupant.

  One embodiment of a vehicle seat according to the present invention will be described with reference to FIGS. Fig.1 (a) is sectional drawing at the time of seeing the vehicle seat of this embodiment from the side, and FIG.1 (b) is the elements on larger scale.

  As shown in FIG. 1A, the vehicle seat is, for example, a passenger seat seat disposed on the left side in front of the vehicle, and a seat portion 1 that supports the thigh from the buttocks of the passenger P; The backrest part 2 comprised so that reclining is possible, the headrest 3 which supports the passenger | crew's P head, and the seatbelt 4 are provided.

  Here, the seat belt 4 is a three-point fixed seat belt provided to restrain the passenger P seated on the seat portion 1. That is, the lap belt portion 4a of the seat belt 4 is stretched from one side of the lap portion K of the passenger P to the other side in the horizontal direction via the front of the lumbar portion K when the occupant is seated. On the other hand, the shoulder belt portion 4b of the seat belt 4 is bridged to the side of the waist portion K via the front of the chest obliquely from the shoulder when the passenger is seated.

  The seat 1 is made of a cushioning material having the frame 11 as a skeleton member, and is covered with a cover 12 made of cloth or leather. FIG. 2 shows the perspective structure of the seat 1 mainly with respect to the frame 11, and the structure of the frame 11 will now be described with reference to FIG.

  As shown in FIG. 2, the frame 11 has a pair of support plates 11a that face in the left-right direction and extend in the front-rear direction. Between the pair of support plates 11a, a bag rod 11b is provided on the rear end side, and a front rod 11c is provided on the front end side. The bag rod 11b and the front rod 11c are formed in a cylindrical shape.

  Between each of the rods 11b and 11c provided so as to oppose each other in the front-rear direction, there are elastic members 13 made of a plurality of (four in this example) springs that are formed in an S-shape and can be expanded and contracted. Both ends thereof are fixed to the rods 11b and 11c, respectively. Each of these elastic members 13 supports the lower surface of the seat portion 1 (see FIG. 1) provided above, and improves the cushion performance (sitting comfort) as the seat portion 1.

  A seat pan 14 made of a rigid material is installed between the front ends of the support plates 11a, that is, at the lower end of the seat portion 1. An enlarged cross-sectional structure of the seat pan 14 is shown in FIG. 1B. Next, the internal structure of the seat pan 14 will be described with reference to FIG. 1B.

  As shown in FIG. 1B, the seat pan 14 is formed to have an accommodation recess 14a as an expansion member accommodation portion that is recessed below the vehicle. The housing recess 14a is formed with a front inner wall 14b and a rear inner wall 14c, both of which form an inner wall, in a shape having a flat portion, and an air bag extending along the front inner wall 14b and the rear inner wall 14c. A device 20 is housed. As is well known, the airbag device 20 includes an inflator 21 for injecting gas when a strong impact on the vehicle is detected, and an inflatable woven fabric airbag 22. .

  Among these, the inflator 21 is made of a cylindrical member extending substantially parallel to the vehicle width direction, and is housed in a housing tube 30 having a hexagonal cross section by being wrapped by a bag-like airbag 22. Has been. Further, the airbag device 20 is provided with a screw portion 23 that protrudes downward from the inflator 21. The airbag device 20 is fixed to the bottom portion 14d of the housing recess 14a by screwing a nut or the like with the screw portion 23.

  Further, in the present embodiment, the airbag 22 becomes a front side when installed in a vehicle and has a vehicle width direction as shown in FIG. A vent hole 24 serving as an opening for an internal pressure adjusting port is formed at a position located in the center, specifically, at a position facing the front inner wall 14b of the housing recess 14a when the airbag 22 is inflated or completed. Yes. Further, in the airbag 22, a sealing member 25 formed of an elastic material such as rubber or resin is provided in the vent hole 24 so as to surround the vent hole 24 by adhesion or welding. As shown in FIG. 1B, the airbag 22 is inflated so that it can be inflated and deployed instantaneously when accommodated in the accommodating recess 14a, that is, before inflated and deployed. The part above 21 is folded in a bellows shape.

  Next, the operation | movement aspect of this airbag apparatus 20 is demonstrated with reference to FIG. 4 and FIG. 4A and 4B are cross-sectional views showing the state transition of the airbag 22 when it is inflated, and FIG. 5 is a graph showing the change in the internal pressure of the airbag 22. Incidentally, in FIG. 5, the change in the internal pressure of the airbag in which the vent hole is not blocked is shown by a curve Y1, and the change in the internal pressure of the airbag 22 of the present embodiment is shown by a curve Y2. A change in the internal pressure of the airbag in which no vent hole is formed is indicated by a curve Y3.

  When a collision detection sensor (not shown) detects a collision of the vehicle, the inflator 21 is driven by control means (not shown), and high-pressure gas is sent from the inflator 21 to the airbag 22. As a result, the airbag 22 starts to inflate while its folds are deployed. As shown in FIG. 4A, the airbag 22 that has started to inflate is inflated upward and comes into contact with the lower surface of the seat portion 1. At this time, the vent hole 24 formed in the airbag 22 is opened without being blocked, and a part of the gas filled in the airbag 22 from the inflator 21 passes through the vent hole 24 to the outside. Released. As a result, as shown in FIG. 5, the airbag 22 is restrained from rapidly increasing its internal pressure indicated by the curve Y2 in comparison with the internal pressure of the airbag indicated by the curve Y3 in the initial stage of inflation. Thus, the impact and the like generated as the airbag 22 is inflated are alleviated. When the airbag 22 is inflated, the seat portion 1 is pushed upward, and the lower surface of the thigh of the occupant P seated on the seat portion 1 is also lifted upward. That is, when the occupant P's thigh is lifted upward in this manner, the body of the occupant P slips under the seat belt 4 in combination with the restraining force of the lap belt portion 4a (see FIG. 1). Occurrence of the phenomenon (submarine phenomenon) is suppressed.

  On the other hand, when the airbag 22 presses the thigh of the occupant P through the seat portion 1, as shown in FIG. A force indicated by an arrow Y due to cooperation between the dead weight of the passenger P and the inertial force that the passenger P tries to move forward acts. As a result, the airbag 22 is pressed down from the upper side to the lower side in the forward direction and spreads in the front-rear direction while sinking downward. Then, the front end of the airbag 22 that is pushed forward toward the front of the vehicle abuts against the front inner wall 14b of the housing recess 14a, and the vent hole 24 is closed by the front inner wall 14b. Since the airbag 22 is made of woven fabric as described above, the airbag 22 is deformed to conform to the shape of the front inner wall 14b when contacting the front inner wall 14b. Basically, it is difficult to form a large gap. However, since such a woven fabric airbag 22 is highly flexible, the contact state with the front inner wall 14b is also difficult to stabilize, and the occlusion around the vent hole 24 is not necessarily sufficient. In this regard, in this embodiment, since the sealing member 25 is provided around the vent hole 24, the sealing member 25 comes into close contact with the front inner wall 14b to assist the closing of the vent hole 24. Since the vent hole 24 is thus closed, as shown in FIG. 5, the internal pressure indicated by the curve Y2 of the airbag 22 is greatly reduced compared to the internal pressure of the curve Y1 even after reaching the maximum value. It will be suppressed. In other words, in the present embodiment, the vent hole 24 communicates with the interior and space through the opening as the airbag 22 starts to be inflated, and with the peripheral members associated with the subsequent shape change of the airbag 22. This opening is closed by contact and functions as an internal pressure adjusting port for naturally adjusting the internal pressure of the airbag 22.

As described above, according to the vehicle seat shown in the present embodiment, the following effects can be obtained.
(1) The airbag 22 communicates with the space below the seat portion 1 through the vent hole 24 as the inflation starts, and the vent hole 24 is closed as the shape changes thereafter. Adopted the structure. In such a structure, when the inflation of the airbag 22 is started, the vent hole 24 is opened to the space, and therefore, the gas is released from the vent hole 24 and is generated along with the inflation of the airbag 22. Impact etc. will be alleviated. On the other hand, according to the same configuration, when the inflation of the airbag 22 proceeds or when the inflation is completed, the vent hole 24 is blocked by contact with the peripheral member accompanying the shape change. In such a state, the outflow of gas from the vent hole 24 is suppressed, and as a result, a decrease in the internal pressure of the airbag 22 is also suppressed. Therefore, it is possible to achieve both the relaxation of the impact when the airbag 22 provided at the lower part of the seat portion 1 is inflated and the suppression of the decrease in the internal pressure of the airbag 22.

  (2) The seat pan 1 is formed of a rigid material at the lower end of the seat portion 1 and is provided with a seat pan 14 for accommodating the airbag 22 together with the inflator 21, and the vent hole 24 is formed after the airbag 22 starts to be inflated. Along with the shape change, the front side inner wall 14b of the housing recess 14a formed in the seat pan 14 is abutted and closed. Usually, the vehicle seat is provided with a housing portion for accommodating the expansion member and a frame as a skeleton member for ensuring the strength thereof, and also in the seat portion of the seat for improving the seating comfort. A cushion or the like is provided. Therefore, in many cases, it is not possible to secure a sufficient arrangement space required for separately providing a member for closing the opening. In this regard, in the configuration of the present embodiment, since the vent hole 24 is closed when the seat pan 14 and the airbag 22 that are generally provided in the vehicle seat come into contact with each other, the vent hole 24 is closed. Therefore, it is not necessary to provide a new member, and the realization thereof is facilitated.

  (3) The contact of the vent hole 24 with the housing recess 14a is from the seat 1 side after the airbag 22 is inflated due to the cooperation of its own weight with the seat 1 and the passenger seated in the seat 1 It is made by pressing. In the same configuration, the seat portion receives the deformation of the seat portion 1 and the weight of the passenger P sitting on the seat portion 1, that is, the reaction force when the airbag 22 presses the thigh of the passenger P. 1 sinks, and the vent hole 24 of the airbag 22 is closed as the seat 1 settles, that is, when the seat 1 is pressed. For this reason, since the reaction force which acts on the airbag 22 is so large that the passenger P's weight is heavy, the vent hole 24 is closed early, and on the other hand, the time when the vent hole 24 is blocked is delayed as the passenger P's weight is light. Will be. In general, it is desirable for the passenger P with a light weight to reduce the impact of the airbag 22 more than the passenger P with a heavy weight. In this regard, as described above, the time when the vent hole 24 is blocked by the contact between the airbag 22 and the housing recess 14a is naturally adjusted according to the physique of the passenger P. Therefore, the internal pressure of the airbag 22 can be adjusted. It will be performed in a more desirable manner.

  (4) The airbag 22 made of woven fabric is adopted as the inflating member. As the air bag 22 made of woven fabric is inflated, gas flows out to the outside through a gap between the woven fabric itself even though the amount is small. Therefore, the impact mitigating action accompanying the expansion is promoted, and the shape change becomes more flexible, so the degree of freedom of the contact manner between the airbag 22 and the seat pan 14 is also increased. Therefore, the vent hole 24 is also more accurately closed along with the contact.

  (5) Around the vent hole 24 of the airbag 22 made of woven fabric, a seal member 25 is provided which is in close contact with the seat pan 14 and assists the closing of the vent hole 24. As described above, when the woven fabric airbag 22 is employed as the inflating member, the flexibility of the airbag 22 itself increases the degree of freedom in contact with the seat pan 14, and the vent hole 24 The occlusive property will certainly be improved. However, on the other hand, although the vent hole 24 is closed, it is based on mere contact with the seat pan 14, and therefore the contact mode is not stable due to its flexibility. The blockage around the vent hole 24 is not necessarily sufficient. In this regard, if the sealing member 25 is provided around the vent hole 24 as in the configuration of the present embodiment, the adhesion between the vent hole 24 and the seat pan 14 through the sealing member 25, that is, the blocking property is further improved. As a result, the decrease in the internal pressure of the airbag 22 can be more suitably suppressed.

In addition, this embodiment can also be implemented with the following forms which changed this suitably.
When the closing property can be maintained with only the vent hole 24, the airbag 22 may be configured without providing the seal member 25 around the vent hole 24.

Further, the material of the seal member may be other than the above-described rubber or resin, and may be any material that deforms and adheres along the shape of the contact portion of the peripheral member.
Although the woven fabric airbag 22 is used as the expansion member, for example, a configuration using a thin metal expansion member may be employed.

  Although the vent hole 24 is configured to be blocked by the contact between the airbag 22 and the front inner wall 14b of the seat pan 14, the vent hole 24 is blocked by the contact between the airbag 22 and the rear inner wall 14c of the seat pan 14. May be changed. In addition to the seat pan 14, for example, the vent hole may be blocked by the airbag 22 coming into contact with the support plate 11 a constituting the frame 11. Incidentally, in this case, since the support plates 11a are located on both the left and right sides of the airbag, the positions where the vent holes are formed are also on the left and right sides or one side of the airbag. The point is that the vent hole 24 may be closed by contact with the peripheral member.

  -Although the structure which obstruct | occludes the vent hole 24 by having received the weight of the seat part 1 and the passenger P and having deform | transformed the airbag 22 was adopted, instead of such a structure, through the deformation | transformation accompanying expansion | swelling of the airbag 22 A configuration may be employed in which a portion where the vent hole 24 is formed abuts on the peripheral member, thereby closing the vent hole 24.

  The vent hole 24 is opened in advance and formed in the airbag 22, but an internal pressure adjusting port configured to open as the airbag expands may be employed. Specifically, a configuration is possible in which a portion of the woven fabric of the airbag is broken and then the broken portion is sewn with a sewing thread having a strength that can be cut by the inflation pressure of the airbag.

-The air bag 22 may employ a configuration in which the vent hole 24 is closed by, for example, overlapping the air bags 22 with expansion, not by contact with peripheral members.
-In this embodiment, although it showed as a structure of the seat part 1 of the passenger | crew side seat, the vehicle seat of this invention is applicable to any seat installed in a vehicle.

1A is a sectional view of a vehicle seat as viewed from the side, and FIG. 2B is a partially enlarged view of an embodiment of a vehicle seat according to the present invention. The perspective view which shows the perspective structure mainly about the flame | frame of the vehicle seat of the embodiment. The top view which shows typically the state by which the airbag employ | adopted as the vehicle seat of the embodiment was expand | deployed. (A), (b) is sectional drawing which shows the state transition at the time of the airbag expansion | swelling of the vehicle seat of the embodiment. The graph which compares and shows the change of the internal pressure of an airbag.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Seat part, 11 ... Frame, 14 ... Seat pan, 14a ... Housing recessed part, 21 ... Inflator, 22 ... Air bag, 24 ... Vent hole, 25 ... Seal member, P ... Passenger.

Claims (7)

It has a structure in which an inflating member that expands by filling the gas ejected based on the driving of the inflator is provided at the lower front of the seat where the passenger sits, and the front of the seat is lifted based on the expansion of the inflating member In the vehicle seat
An internal pressure adjusting port that naturally adjusts the internal pressure of the expansion member at a position where the inside of the expansion member is communicated with the space through the opening as the expansion starts and the opening is closed as the shape changes thereafter. A vehicle seat characterized in that is provided. 2. The vehicle seat according to claim 1, wherein the opening of the internal pressure adjusting port is closed by contact with a peripheral member of the expansion member accompanying a shape change caused by expansion of the expansion member. The lower part of the seat part is made of a rigid material and is provided with an inflating member accommodating part for accommodating the inflating member together with the inflator, and the internal pressure adjusting port has a shape change after the inflating member starts to expand. Accordingly, the vehicle seat according to claim 2, wherein the opening is closed by abutting against an inner surface of the expansion member housing portion. A plate-like frame, which is a skeleton member, is provided at a lower portion of the seat portion, and the internal pressure adjusting port comes into contact with the surface of the frame as the shape thereof changes after the expansion of the expansion member starts to open. The vehicle seat according to claim 2, wherein the vehicle seat is closed. After the start of expansion of the expansion member, the contact of the internal pressure adjusting port with the peripheral member due to the shape change is the same expansion due to the cooperation of the weight of the seat and the weight of the passenger sitting on the seat. The vehicular seat according to any one of claims 2 to 4, wherein the vehicular seat is performed by pressing from the seat portion side after expansion of the member. The vehicle seat according to any one of claims 1 to 5, wherein the inflatable member is a woven airbag. The vehicle seat according to claim 6, wherein a seal member that assists in closing the opening is provided around an opening serving as the internal pressure adjusting port of the woven fabric airbag.

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