JP3532174B2 - Folding structure and folding method of airbag for occupant protection device - Google Patents

Description

Detailed Description of the Invention

[0001]

The present invention relates is for about <br/> the folded structure of the occupant protection system an airbag for a vehicle and its folding Way Method, in particular, the seat in a state of being close to the face on the steering wheel even riding to have the driver's seat passenger, at the time of collision, in which about the folding structure of the airbag can be as much as possible safely protect passenger its folding way method.

[0002]

2. Description of the Related Art In a conventional occupant protection system using an airbag, FIG. 13 which is a front view showing a state of holding a folded airbag and FIG. 14 which is a plan view thereof are conceptually shown. The flange 9a of the gas generator 9
The airbag 1 in which the peripheral portion of the gas generator inlet is sandwiched and held by the retainer ring 6 and the retainer ring 6 is folded by an appropriate folding method to form a final folded body 21 having a substantially rectangular shape, and then the folded state. To hold
The packing strap 20 is the final folding body 21.
It is stretched to cover the outer surface of the. Both ends of the packing strap 20 are connected to the airbag 1 and the gas generator 9.
Is held by an appropriate means such as locking to a bolt 10 for fixing to the retainer 6.

The packing strap 20 is stretched in a direction orthogonal to the central contact surface 22 of the left folding portion 21a and the right folding portion 21b of the final folding body 21 and surrounding the outer peripheral surface thereof. A rupture portion 20a such as a perforation that is ruptured when the airbag is deployed is formed at a position corresponding to the central contact surface 22 of the central portion thereof, and a bag cover (not shown) is appropriately attached to the upper surface thereof. The structure is such that it can be installed in the right place of the vehicle.

[0004]

In the folding structure according to the present invention, when the airbag is deployed, when the predetermined portion of the bag cover is cleaved and the airbag is inflated toward the occupant, the folding of the bag cover is interfering. Since the breaking portion 20a of the packing strap 20 is broken before and after, the airbag 1 having lost all restraints rapidly inflates and deploys toward the occupant. On the other hand, depending on the physique and posture of the occupant, the occupant 31 may be seated at a position close to the steering wheel 33, as conceptually shown in FIG. In such a case, since the occupant's face is in a state of being close to the steering wheel 33, when the airbag 1 is deployed in this state, the inflation tip portion 3 of the airbag is inflated.
There is a case where 0 bulges so that the chin 32 of the occupant 31 is pushed up from below, and seriously impairs the neck 34 of the occupant.

Therefore, even in the case where the occupant is sitting close to the steering wheel, an airbag that protects the occupant's chest and head appropriately and does not hinder the occupant. A device is desired.

In view of the present situation, it is an object of the present invention to provide an airbag device capable of safely and surely protecting an occupant even when the occupant is sitting close to a steering wheel. In addition, the present invention provides a means capable of achieving the object by a simple method without requiring a special component therefor.

[0007]

The present invention has been made based on such a viewpoint, and achieves the above object by a simple folding structure of an air bag. The upper and lower parts of the bag are folded toward the central part to form a laterally long fold body composed of an upper fold part and a lower fold part, and the left and right parts of the laterally long fold body are respectively fold toward the central part. A substantially rectangular final fold body composed of a left fold portion and a right fold portion is formed, and a width-breakable band-shaped packing strap for holding the shape of the final fold body is folded to the left and right of the final fold body. The final folding by stretching the part in parallel with the contact surface so as to cover the upper surface of the contact surface.
The packing strap that retains the shape of the body
Has a rupture part that breaks when the airbag is deployed,
The folding structure of the airbag is formed in the direction orthogonal to the contact surface , which allows the airbag to be deployed in the left-right direction before the packing strap breaks, so that the chest and shoulders of the occupant are held in advance. The subsequent deployment of the airbag in the vertical direction is designed to occur on the front surface of the occupant's face, thereby achieving the above-mentioned object without adding any special parts.

In the structure of the packing strap used in the present invention, one end side is fixed to the center of the back surface side of the airbag, and the other end side is formed with an engaging portion to be engaged with the airbag holding member. It is preferable that the airbag and the packing strap are integrated with each other, and a rupturable portion that can be ruptured in the width direction is formed. As another structure of the packing strap, there is a structure in which locking portions that are locked to the airbag holding member are formed at both ends and breakable portions that can be broken in the width direction are formed. In this case, the packing strap can be used in common with other airbag devices.

The breaking portion is positioned above the vertical center line of the final folded body when the packing strap is stretched, so that the breaking end portion of the packing strap broken when the airbag is deployed. However, it is expected to prevent the possibility of being caught in the occupant's chin and hindering the deployment of the airbag.

The shape of the breaking portion of the packing strap is preferably a slit or a perforation formed in the width direction of the packing strap.

Further, as a concrete folding structure, it is preferable that both the upper folding portion and the lower folding portion are folded on the back side of the airbag and then inverted on the front side. The preferred folding configuration is that the left folding portion and the right folding portion of the final folding body are both folded on the back side of the airbag and then inverted on the front side.

Further, as a method of folding the airbag for forming the folding structure according to the present invention, a lateral folding in which the upper portion and the lower portion of the airbag are folded toward the central portion to form a horizontally long folded body, respectively. a step, a vertical folding step to form a substantially rectangular final folded folded toward the respective central portions of the left and right portions of the transverse length folded, the air bag
A strip-shaped packing that has a break in the width direction that breaks when expanded.
The folding straps on the left and right sides of the final folding body.
Cover the upper surface of the center contact surface of the folding part, and fold the left and right sides.
One parallel to the central contact surface so that the folding side is opened
And a packing step in which the shape of the final folded body is maintained by stretching it in the direction .

Also in this method, in the lateral folding step, both the upper folding part and the lower folding part, which are formed by folding the upper part and the lower part of the airbag on the back side of the airbag by a predetermined width, respectively. Employing a step of inverting and mounting on the front side of the airbag, on the other hand, as the vertical folding step, the left and right folding portions formed by folding the left and right portions of the horizontally long folding body respectively on the back side of the airbag by a predetermined width, In both cases, it is preferable to adopt a step of mounting the airbag on the front side.

As the airbag used in the folding structure and the folding method, the airbag has a front surface side facing the occupant, a back surface side facing the occupant, and one end portion fixed and folded to the back surface side. A belt-like packing strap for stretching the outer peripheral surface of the airbag to maintain the folded shape of the airbag, and a gas generator charging opening and a vent hole for charging and fixing the gas generator on the back side. The one end of the band-shaped packing strap is fixed to the back side center or in the vicinity thereof, and the other end thereof is stretched around the outer peripheral surface of the folded airbag. A locking portion that is locked by a holding member that holds the gas generator and the airbag is formed, and a break for breaking the packing strap in the width direction is provided between the one end and the other end. There are formed, it is and are preferred embodiments having a structure composed by drooping toward the other end in the lower portion of the airbag.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below. First, the structure of the airbag used in the present invention will be described. FIG. 1 (a) is a plan view of the airbag used in the present invention as seen from the back side, and FIG. 1 (b) is a side view showing the upper portion of the airbag toward the occupant and the lower portion thereof toward the occupant. The description is given below. In the figure, the airbag 1 is provided with a gas generator inlet 11 for mounting a gas generator (not shown) in a central portion of a back surface B thereof, and a vent hole 12 is formed in an appropriate portion of a rear surface of an upper portion 1a thereof. A plurality is formed. A band-shaped packing strap having an annular one end 4a corresponding to the central gas generator charging port 11 and two small holes 4c at the other end 4b for engaging with an airbag holding member described later. 4, the annular end portion 4a is sewn to the airbag so as to be located on the outside of the back surface of the airbag. Further, a breaking portion 4d such as a slit for breaking the packing strap 4 in the width direction when the airbag is deployed is formed in a portion of the packing strap 4 near the locking portion 4c. still,
Small holes 13 formed around the gas generator inlet 11
Is a bolt hole for mounting the airbag on the holding member 6.

Next, the procedure for folding the airbag according to the present invention will be described. 2 to 7 are process diagrams showing the procedure, FIGS. 2 to 4 show a horizontal folding process, FIGS. 5 and 6 show a vertical folding process, and FIGS. a)
Is a plan view and (b) is a side view. First, as shown in FIG. 2, the lower part 1b of the airbag 1 is folded toward the center part in a bellows shape on the rear surface B side of the airbag with a predetermined width from its end to the vicinity of the gas generator inlet 11. , And then Fig. 3
As shown in FIG. 5, the folded body is inverted to the front surface A side of the airbag and placed on the front surface A side to form the lower folded portion 2b. 2 is a plan view seen from the back surface B side of the airbag, and FIG. 3 is a plan view seen from the front surface A side of the airbag.

Similarly, the upper portion 1a of the airbag 1 is also folded into a bellows shape with a predetermined width on the back surface B side of the airbag 1 and then inverted to the front surface A side and placed on the front surface A side. As a result, as shown in FIG. 4 (a) (a plan view seen from the surface A side of the airbag), an upper folding part 2a is formed parallel to the lower folding part 2b, and the upper and lower folding parts 2 are formed.
The oblong folding body 2 having a rectangular shape including a and 2b is formed.

Next, as shown in FIG. 5, the left side portion of the horizontally long foldable body 2 is spirally folded toward the center from the end portion to the back side by a predetermined width, and is folded in a predetermined width spirally. Further, as shown in FIG. 6, the left folded portion 3a is formed by reversing the folded portion and mounting it. Similarly, the right side portion of the horizontally long foldable body 2 is also spirally folded to form the final foldable body 3 as shown in FIG. That is, the left and right folding portions 3 of the airbag 1 in which the peripheral portion of the gas generator loading opening 11 is sandwiched by the airbag holding member 6 and the flange 9a of the gas generator 9.
The final folded body 3 composed of a and 3b is placed on the gas generator 9.

Restraining the final folded body 3 in this state,
It is necessary to keep the folded shape. Therefore, in the present invention, FIG. 7 which is a front view of the state of the final folded body 3 is shown.
8 is a side view thereof and FIG. 9 is a plan view thereof.
, The one end 4a is fixed to the center of the airbag 1 and the other end 4b is hung on the back surface of the lower portion of the airbag 1, and the band-shaped packing strap 4 is attached to the final folded body. Left and right folding parts 3a of 3,
3b is stretched in parallel with the contact surface 7 so as to cover the upper part of the central contact surface 7 of 3b and wrap around from the lower surface of the rear surface of the final folding body 3 to the upper surface of the rear surface through the front side and the other end 4b. The locking portion (small hole) 4c is locked to a fastening bolt 10 for holding the airbag 1 on the holding member 6 to hold the shape of the final folded body 3.

In the stretched state of the packing strap 4, as shown in FIG. 9, a slit (broken portion) formed in the width direction for breaking the packing strap 4 in the width direction when the airbag is deployed. ) 4d is positioned above the vertical center line 8 of the final folded body 3. That is, the packing strap 4
By arranging the breaking portion 4d in the vicinity of the locking portion 4c formed on the one end portion 4b, the packing strap 4 is moved from the lower rear surface to the upper rear surface from the lower rear surface to the front surface. In the state of being stretched so as to be wrapped in the up and down direction, the breaking portion 4d is located above the vertical center line 8 of the final folded body 3.

Next, a deployment mode of the airbag having the folding structure according to the present invention will be described. FIG. 10 is a plan view conceptually showing the state of the airbag in the initial stage of deployment, as seen from the side of the occupant. When the vehicle collides and a predetermined acceleration change occurs, the gas generator operates by detecting this and the high-pressure gas is rapidly supplied into the airbag, and the final folding of the airbag folded as described above. The body 3 starts unfolding in the reverse order of the folding process described above. That is, first, the left and right folding portions 3a and 3b of the final folding body 3 start to inflate in the left and right direction, and the inflation pressure causes the bag cover (not shown) to be torn up and down, so that the airbag pops out from the inside. Folding part 3
a and 3b jump out in the left-right direction and start expansion. At this time, since the packing strap 4 is stretched in parallel with the contact surfaces 7 of the left and right folding parts 3a and 3b, it does not hinder the development of the left and right folding parts 3a and 3b.
It easily bulges in the left-right direction with the vertical expansion restricted. As a result, the left inflating portion 3a ′ in the inflating process of the left folding portion 3a and the right inflating portion 3b ′ in the inflating process of the right folding portion 3b are in a state in which the central portion is half-restrained by the packing strap 4. When the occupant is sitting close to the steering wheel, these inflated portions 3a 'and 3b' are formed at positions corresponding to the region from the chest to the shoulder of the occupant. Therefore, the inflating portions 3a 'and 3b' support the occupant's chest and shoulders and prevent the occupant from abnormally approaching the steering wheel before the airbag is fully deployed.

In the state shown in FIG. 10 in which both the inflating portions 3a 'and 3b' are formed, the central portion of the airbag restrained by the packing strap 4 also begins to inflate, so that the packing strap 4 has the above-mentioned structure. As shown in the figure, the slit 4d for breaking has its opening widened to the limit just before breaking, and when it reaches the limit, the packing strap 4 is broken at the slit 4d. As a result, the energy of the high-pressure gas stored inside causes the airbag to be fully deployed at a stretch. At this stage, since the chest and shoulders of the occupant are held by the left and right inflatable parts 3a ′ and 3b ′, the full deployment of the airbag occurs on the front face of the occupant, and the airbag is There is no deployment that pushes up the occupant's jaw. Therefore, even if the occupant sits close to the steering wheel, the occupant's neck is not damaged.

According to the result of the collision test with the dummy doll, when the airbag is deployed with the face of the doll close to the steering wheel, the fragment end of the packing strap 4 is a rubber dummy doll. Occasionally, the deployment of the airbag is hindered by being caught on the jaw of the airbag. However, if the breaking portion 4d of the packing strap 4 is located above the vertical center line 8 of the airbag, Since the portion that jumps up above the fragment is shortened, even when the packing strap 4 is broken, the fragment end of the packing strap 4 is caught by the jaw of the dummy doll located near the steering wheel, and the airbag is closed. It has been found that the occurrence of an abnormal situation that hinders the development of is completely prevented. Since the coefficient of friction of the rubber dummy doll and the coefficient of friction of human skin are completely different, it is unlikely that such a problem will occur for humans. It can be said that it is preferable that the breaking portion 4d is located above the vertical center line 8 of the airbag as described above.

In the above description, the case where the breakage portion 4d of the packing strap 4 is a slit is illustrated, but the present invention is not limited to this, and perforations having intermittent small holes are formed. The shape of the packing strap 4 may be any shape as long as it can break the packing strap 4 in the width direction.

Also, as for the form of the packing strap 4, one end described above is sewn to the peripheral portion of the gas generator charging opening of the airbag, and the locking portion 4c is formed at the other end. As shown in FIG. 11, a long belt-shaped strap 4
The engaging portions 4c and 4c 'may be formed at both ends of the. That is, as shown in the figure, the long band-shaped packing strap 4 is attached to the center contact surface 7 of the left and right folding parts 3a and 3b of the final folding body 3 of the airbag.
The structure may be such that the locking portions 4c and 4c 'formed of small holes formed on both ends thereof are locked to the bolts 10 of the airbag holding member 6, respectively. In short,
The shape and structure are arbitrary as long as the structure is stretched above the contact surfaces 7 of the left and right folding portions 3a and 3b of the final folding body 3 to hold the folded state of the airbag. Incidentally, when the airbag 1 and the packing strap 4 are integrated as shown in FIG. 1, there is an advantage that the packing strap 4 can be locked only once at one end, but one end 4a is previously sewn. A dressing process is required. On the other hand, when the packing strap 4 having the locking portions 4c and 4c 'formed at both ends is used, the locking step of the packing strap involves two steps for locking both ends. The process of sewing is unnecessary. Therefore, whether to eliminate the sewing process or reduce the total number of parts by using the packing strap as a common part with another airbag device is a design concept or a production management concept. It may be appropriately performed based on this.

Further, in the above-described example, the fastening bolt 10 for holding the airbag 1 on the holding member 6 penetrates the airbag 1, the gas generator 9, and the airbag holding member 6 such as a retainer. However, depending on the type of airbag module, a stud bolt 10 'is fixed to the gas generator 9 itself, as shown conceptually in FIG. There is also one in which the retainer ring 6 is arranged from the outside through the locking hole. In this case, the packing strap 4
The locking portion 4c of 4 is locked to the stud bolt 10 '.

[0027]

As described above, according to the airbag folding structure of the present invention, the final folding body 3 includes the left and right folding portions 3a and 3b, and both folding portions 3a and 3b.
Since the packing strap 4 is stretched so as to surround the final folded body 3 in parallel with the central contact surface 7 of the left and right folded portions 3a and 3b, the left and right folded portions 3a and 3b start to inflate at the initial stage of airbag deployment. As a result, only the left and right folding portions 3a and 3b are partially inflated while the upper and lower inflation is restrained by the packing strap 4.
The left and right inflated portions 3a ′ and 3b ′ correspond to positions corresponding to the occupant's shoulder and chest when the occupant is close to the steering wheel.
Even if the packing strap 4 is broken and the airbag is fully deployed while holding the shoulder and chest of the occupant, the airbag is deployed in front of the occupant. Therefore, even if the occupant is close to the steering wheel, the obstacle to the occupant in deploying the airbag is reduced,
In particular, since the deployment of the airbag, which pushes up the chin from below, is completely prevented, the safety of the airbag is further improved.

Further, the broken portion 4d of the packing strap 4 is located above the vertical center line 8 of the final folded body 3, so that the fragmented end of the packing strap is brought close to the steering wheel. A situation where the occupant's chin is caught and the airbag is inflated abnormally will be completely prevented.

Further, it is not necessary to add new parts for realizing the safe deployment of the airbag. Therefore, it is possible to realize the safe deployment of the airbag without increasing the cost.

[Brief description of drawings]

FIG. 1 is a drawing of an airbag used in the present invention,
(A) is a plan view seen from the back surface, and (b) is a side view.

FIG. 2 is a conceptual diagram of the airbag showing the first folding step of the airbag folding method of the present invention, which is (a).
Is a plan view seen from the back surface of the airbag, and (b) is a side view.

3A and 3B are conceptual views of the airbag showing the next folding step of the airbag folding method of the present invention, in which FIG. 3A is a plan view seen from the surface of the airbag, and FIG. 3B is a side view. .

FIG. 4 is a conceptual view of an airbag showing a further folding step in the airbag folding method of the present invention, in which (a) is a plan view seen from the surface of the airbag, and (b) is a plan view.
Is a side view.

5A and 5B are conceptual views of the airbag showing the next folding step in the airbag folding method of the present invention, in which FIG. 5A is a plan view seen from the surface of the airbag, and FIG.
Is a side view.

6A and 6B are conceptual views of the airbag showing the next folding step in the airbag folding method of the present invention, in which FIG. 6A is a plan view seen from the surface of the airbag, and FIG.
Is a side view.

FIG. 7 is a front view showing a state of a final folded body in the airbag folding method of the present invention.

8 is a side view of the final folded body of FIG. 7 in a state.

9 is a plan view of the final folded body of FIG.

FIG. 10 is a conceptual diagram showing the initial state of deployment of the airbag of the present invention.

FIG. 11 is a side view showing another embodiment of the folded airbag according to the present invention.

FIG. 12 is a side view of essential parts showing an example in which the present invention is applied to a gas generator with stud bolts.

FIG. 13 is a front view showing a conventional airbag folding body.

14 is a plan view of the airbag folding body of FIG.

FIG. 15 is a conceptual diagram showing a state of an initial stage of deployment of a conventional airbag.

[Explanation of symbols]

1 ... Airbag 1a ... the upper part of the airbag 1b ... lower part of the airbag 2. Horizontal oblong folding body 2a ... Folding part on the upper side of the airbag 2b ... Folding part on the lower side of the airbag 3 ... The final folded body of the airbag 3a ... Left side folding part of the horizontally long folding body 3b ... right side folding part of the horizontally long folding body 3a '... Initial expansion part of left side folding part 3b '... Initial inflating portion of right folding portion 4 ... packing strap 4a ... One end of the packing strap 4b ... the other end of the packing strap 4c, 4c '... Locking portion of packing strap 4d ... Broken part of packing strap 6 ... Airbag holding member 7 ... Central contact surface of the left and right folding parts of the final folded body 8 ... Vertical center line of final folded body 9 ... Gas generator 10 ... bolts 11 ... Airbag gas generator inlet 12 ... Bent hole

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yutaka Nakajima 1764-12 Kaminaeda, Chiyoda-cho, Shinji-gun, Ibaraki Autoliv Japan Co., Ltd. Japan Technical Center (56) Reference JP-A-11-59310 (JP, A) ) JP-A-11-78746 (JP, A) JP-A-9-263204 (JP, A) JP-A-7-277125 (JP, A) JP-A-9-118187 (JP, A) JP-A-7- 268198 (JP, A) JP 11-198749 (JP, A) JP 11-192908 (JP, A) Actual development Sho 50-131742 (JP, U) Registered utility model 3011543 (JP, U) Registered utility Proposal 3027291 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B60R 21/20

Claims (13)

(57) [Claims] 1. An airbag (1) for a vehicle occupant protection device.
A folding structure of the airbag (1), wherein the airbag (1) has an upper side (1a) and a lower side (1b).
Are folded toward the central part to form a laterally long fold body (2) consisting of an upper fold part (2a) and a lower fold part (2b), and the left and right parts of the horizontally long fold body (2) are formed. fold the toward the respective central portion left fold (3a) and the right folding portion (3b) because substantially rectangular final folded body formed to form a (3), the left folded portion (3a) and the right folding unit ( 3b)
Covers the upper surface of the central contact surface (7) with
Band of which shape is open on the side of the folding parts (3a, 3b)
The packing strap (4) in the shape of
The final folded body is stretched in a direction parallel to (7).
While maintaining the shape of (3), the packing stra
The fold (4) has a rupture portion that ruptures when the airbag is deployed.
(4d) is shaped in a direction orthogonal to the central contact surface (7).
Folding of the occupant protection device an airbag, characterized by being made. 2. The packing strap (4) has one end side (4a) fixed to the center of the back side (B) of the airbag and the other end side (4b) holding the airbag (1). The holding portion (6) for holding the holding portion (6) is formed, and the breaking portion (4d) that is broken when the airbag is deployed is formed in the width direction thereof. Folding structure of airbag for passenger protection device. 3. A holding member (6) for holding the airbag (1) at both ends of the packing strap (4).
The occupant protection device according to claim 1, wherein a locking portion (4c, 4c ') that is locked to the vehicle is formed, and a breaking portion (4d) that breaks when the airbag is deployed is formed in a width direction thereof. Air bag folding structure. 4. The breaking portion (4d) is formed in the final folded body (3) when the packing strap (4) is stretched.
The folding structure for an airbag for an occupant protection device according to claim 2 or 3, wherein the folding structure is located above a vertical centerline (8) of the. 5. The folding structure for an airbag for an occupant protection device according to claim 2, wherein the breaking portion (4d) is a slit formed in a width direction of the packing strap. 6. The folding structure for an airbag for an occupant protection device according to claim 2, wherein the breaking portion (4d) is a perforation formed in a width direction of the packing strap. 7. The upper side folded portion (2a) and the lower side folded portion (2b) of the airbag (1) are both folded to the back side (B) of the airbag (1) and then the front side (B). The fold structure for an airbag for an occupant protection device according to any one of claims 1 to 6, which is placed upside down in (A). 8. The left folding part (3a) and the right folding part (3) of the final folding body (3) of the airbag (1).
The folded structure of the airbag for an occupant protection device according to claim 7, wherein the b) and the b) are both folded on the back side (B) of the airbag (1) and then inverted on the front side (A). . 9. An airbag (1) for a vehicle occupant protection device.
A method for folding an airbag, comprising: an upper part (1a) and a lower part (1b) of the airbag (1).
And a horizontal folding step of folding the horizontal folding body (2) toward the central portion to form a laterally long folding body (2), and a left and right portion of the laterally folding body (2) toward the central portion, respectively. The vertical folding step for forming 3) and the breaking portion (4d) that breaks when the airbag is deployed are formed in the width direction.
Attach the band-shaped packing strap (4)
The left and right folding parts (3a, 3) of the final folding body (3)
b) covers the upper surface of the central contact surface (7) and
So that the side of the side folding part (3a, 3b) is opened
Stretch in a direction parallel to the central contact surface (7), and
Packing process for maintaining the shape of the folded body (3)
A method of folding an airbag for an occupant protection device, comprising: 10. The lateral folding step is performed by folding the upper portion (1a) and the lower portion (1b) of the airbag on the back side (B) of the airbag by a predetermined width. The folding of the airbag for an occupant protection device according to claim 9, further comprising the step of inverting and mounting both (2a) and the lower folding portion (2b) on the front surface side (A) of the airbag (1). Method. 11. The left and right folding portions (3a, 3) formed by folding the left and right portions of the horizontally long folding body (2) on the back surface side (B) of the airbag by a predetermined width in the vertical folding step.
The method for folding an airbag for an occupant protection device according to claim 9 or 10, including the step of reversing b) on the front surface side (A) of the airbag. 12. The packing strap (4) comprises:
One end side (4a) is the back side (B) of the airbag (1)
Locking part (4c) fixed to the central part and locked to the holding member (6) holding the airbag on the other end side (4b).
And a breaking portion (4d) capable of breaking the packing strap in the width direction is formed. In the packing step, the locking portion (4c) formed on the other end side is formed. And a step of engaging with a holding member (6) holding the airbag so that a central portion on the front surface side of the final folded body (3) is stretched vertically. A method for folding an airbag for an occupant protection device according to any one of (1) to (5). 13. The packing strap (4) comprises:
A breakage in which locking parts (4c, 4c ') that are locked to a holding member (6) holding the airbag (1) are formed at both ends and the packing strap (4) can be broken in the width direction. A part (4d) is formed, and the packing step is performed by the packing strap (4).
The method includes a step of vertically stretching the front central portion of the final folded body (3) to lock the locking portions (4c) at both ends to the holding member (6). 9 to 1
The method for folding an airbag for an occupant protection device according to claim 1.