Curtain airbag cushion

Provided is a curtain airbag cushion folded such that an airbag cushion can be developed inside the vehicle.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application claims priority to Korean Patent Application Number 10-2010-0086530 filed Sep. 3, 2010, the entire contents of which application is incorporated herein for all purposes by this reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a curtain airbag cushion, and more particularly, to a curtain airbag cushion folded to be mounted in a vehicle.

2. Description of the Related Art

In general, vehicles are equipped with airbag systems, safety devices, which protect passengers, using an airbag cushion inflated by inflow gas in an accident.

The airbag systems are mounted at several places for specific objects in vehicles, and there are a driver's seat airbag system that is mounted in the steering wheel to protect the driver in the driver's seat, a passenger airbag system mounted above the glove box to protect the passenger in the passenger seat, and curtain airbag systems that are mounted at the sides of the vehicle to protect the head of the driver or passengers (hereafter, the driver or passenger is integrally called a passenger for convenience of description).

In those airbag systems, the curtain airbag systems are mounted inside the A-pillar and the C-pillar at the upper portions of the front doors and the rear doors for the passengers getting in/out of the vehicle (hereafter, the front doors and the rear doors are referred to as doors for convenience of description), long in the longitudinal direction of the vehicle.

The curtain airbag system includes an inflator generating gas and the airbag cushion that is developed the gas from the inflator to cover the glass of the door window like a curtain from the top of the door, from the inflator and positioned between the door and the passenger's head to protect the passenger's head if the vehicle is hit at the side.

The airbag cushion is folded and mounted inside the A-pillar and the C-pillar and unfolded and developed by the gas flowing thereinto from the inflator, in which the airbag cushion should be developed inward in the vehicle, not outside the vehicle, to protect the passenger's head.

Therefore, a method of folding the airbag cushion such that the airbag cushion can be developed inside the vehicle is required.

SUMMARY OF THE INVENTION

The present invention has been made in effort to provide a curtain airbag cushion folded such that an airbag cushion can be developed inside a vehicle.

The objects of the present invention are not limited to the object described above, and the other objects not stated in the above will be clearly understood by those skilled in the art from the following description.

An exemplary embodiment of the present invention provides a curtain airbag cushion that includes: a folded portion that comprises a first folded portion formed by folding one end of an airbag cushion having a first side and a second side opposite to the first side, with the first side overlapping, and a second folded portion with the second side overlapping which is formed by folding one end of the first folded portion toward the first side, and that is formed by folding one end of the second folded portion toward the first side, with the second side overlapping; and a straight portion that extends straight from the folded portion, at the other end of the airbag cushion, with the second side overlapping the folded portion.

Another exemplary embodiment of the present invention provides a curtain airbag cushion that includes: a folded portion that comprises a first folded portion formed by folding one end of an airbag cushion having a first side and a second side opposite to the first side, with the first side overlapping, and a second folded portion with the second side overlapping which is formed by folding one end of the first folded portion toward the first side, and that is formed by folding one end of the second folded portion toward the first side, with the second side overlapping; and a straight portion that extends straight from the folded portion, at the other end of the airbag cushion, with the second side overlapping the folded portion.

Yet another exemplary embodiment of the present invention provides a curtain airbag cushion that includes: a folded portion that comprises a first folded portion formed by folding one end of an airbag cushion having a first side and a second side opposite to the first side, with the first side overlapping, and a second folded portion with the second side overlapping which is formed by folding one end of the first folded portion toward the first side, and that is formed by folding one end of the second folded portion toward the first side, with the second side overlapping; a straight portion that is formed at the other end of the airbag cushion, with the second side overlapping the folded portion; and a third folded portion connecting the folded portion with the straight portion, with the second side overlapping.

Still another exemplary embodiment of the present invention provides a curtain airbag cushion that includes: a folded portion that comprises a first folded portion formed by folding one end of an airbag cushion having a first side and a second side opposite to the first side, with the first side overlapping, and a second folded portion with the second side overlapping which is formed by folding one end of the first folded portion toward the first side, and that is formed by folding one end of the second folded portion toward the first side, with the second side overlapping; a straight portion that is formed at the other end of the airbag cushion, with the second side overlapping the folded portion; and an extender connecting the folded portion with the straight portion, with the second side overlapping the folded portion.

Still yet another exemplary embodiment of the present invention provides a curtain airbag cushion that includes: a folded portion that comprises a first folded portion formed by folding one end of an airbag cushion having a first side and a second side opposite to the first side, with the first side overlapping, and a second folded portion with the second side overlapping which is formed by folding one end of the first folded portion toward the first side, and that is formed by folding one end of the second folded portion toward the second side, with the second side overlapping; and a straight portion that extends straight from the folded portion, at the other end of the airbag cushion, with the second side overlapping the folded portion.

Further, still yet another exemplary embodiment of the present invention provides a curtain airbag cushion that includes: a folded portion that comprises a first folded portion formed by folding one end of an airbag cushion having a first side and a second side opposite to the first side, with the first side overlapping, and a second folded portion with the second side overlapping which is formed by folding one end of the first folded portion toward the second side, and that is formed by folding one end of the second folded portion toward the first side, with the second side overlapping; and a straight portion that extends straight from the folded portion, at the other end of the airbag cushion, with the second side overlapping the folded portion.

The details of other exemplary embodiments are included in the detailed description and the drawings.

According to the exemplary embodiments of the present invention, since the folded portion is unfolded like a book is opened, frictional resistance is reduced in development and the pressure for developing inside the vehicle is correspondingly improved, such that the development speed is also improved.

The effects of the present invention are not limited to the effects described above, and the other effects not stated in the above will be clearly understood by those skilled in the art from the following description.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Advantages and features of the present invention and methods for achieving them will be made clear from exemplary embodiments described below in detail with reference to the accompanying drawings. However, the present invention is not limited to exemplary embodiments described herein and will be implemented in various forms. The exemplary embodiments are provided by way of example only so that a person of ordinary skill in the art can fully understand the disclosures of the present invention and the scope of the present invention. Therefore, the present invention will be defined only by the scope of the appended claims. Like reference numerals designate like components throughout the specification.

Curtain airbag cushions according to an exemplary embodiments of the present invention are described hereafter with reference to the accompanying drawings.

FIG. 1is a side view showing a vehicle equipped with a curtain airbag cushion according to a first exemplary embodiment of the present invention,FIG. 2is a view showing when the curtain airbag cushion according to the first exemplary embodiment of the present invention is mounted in a vehicle, andFIG. 3is a cross-sectional view taken along the line A-A ofFIG. 2.

Referring toFIGS. 1 to 3, a curtain airbag system100including a curtain airbag cushion100according to the first exemplary embodiment of the present invention is mounted long in the longitudinal direction in the roof of a vehicle1.

The vehicle1is provided with front doors2and rear doors3for passengers to get in/out of the vehicle (the passengers means all of the driver and passengers, and hereafter, is referred to as a passenger for the convenience of description). An A-pillar4is disposed above the front doors2and a C-pillar5is disposed above the rear doors3.

The curtain airbag system100is mounted long in the longitudinal direction to a side inner panel6disposed inside the A-pillar4and the C-pillar5.

The curtain airbag system100includes an inflator20generating gas and the airbag cushion10connected with the inflator20and developed and inflated by the gas flowing thereinto from the inflator20to protect the passenger's head.

The airbag cushion10is folded and sealed in a cushion cover30, and then mounted to the side inner panel6in the A-pillar4and the C-pillar5by a fastener7.

The curtain airbag system100is covered with a head liner8and not shown in the vehicle. The headliner8is the member that is made of fiber to cover the roof panel (not shown) of the vehicle1not to be exposed in the vehicle. The head liner8is locked to a weather strip9at the lower end of the side inner panel6and separated from the weather strip9when the airbag cushion10inflates, in which the airbag cushion10comes out and inflates through the gap between the weather strip9and the head liner8to be positioned between the passenger' head and the front door2and the rear door3to protect the passenger's head.

FIG. 4is a side view when the curtain airbag cushion10according to the first exemplary embodiment of the present invention has been unfolded andFIG. 5is a cross-sectional view taken along the line B-B ofFIG. 4.

Referring toFIGS. 4 and 5, a plurality of mounting taps15for mounting the side inner panel6is formed at the top of the airbag cushion10. The mounting taps15are fastened to the side inner panel6by the fastener7shown inFIG. 3.

Further, an inflator connector17that is connected with the inflator20is formed at the rear upper portion of the airbag cushion10. The airbag cushion10is developed and inflated by the gas generated by the inflator20and flowing into a chamber19of the airbag cushion10.

An A-pillar tether16that is fixed to the side inner panel inside the A-pillar4is connected to the front of the airbag cushion10. Therefore, the airbag cushion10inflates with the front restricted by the A-pillar tether16, such that it can be developed without inclining backward.

The airbag cushion10includes a first side12and a second side14at the opposite side to the first side12. The first side12and the second side14are kept flat at the opposite sides, before the gas flows in the chamber19. The first side12faces the passenger and the second side14faces the outside of the vehicle14.

The airbag cushion10should be developed inside the vehicle toward the passenger, not the outside of the vehicle1, in order to protect the passenger's head.

The curtain airbag cushion10according to the first exemplary embodiment of the present invention has been folded such that the pressure for developing inside the vehicle can be improved, and it is inflated and developed inside the vehicle by the gas flowing thereinto from the inflator20to protect the passenger's head.

The shape of the folded airbag cushion10is described below.

FIG. 6is a side view showing the order of folding a curtain airbag cushion10according to the first exemplary embodiment of the present invention.

Referring toFIG. 6, the airbag cushion10is composed of a folded portion11and a straight portion13, when being folded, as shown inFIG. 6D. When dividing in the up-down direction the airbag cushion10unfolded flat, the folded portion11is formed at the lower portion of the airbag cushion10and the straight portion13extends from the folded portion11, at the upper portion of the airbag cushion10. In this configuration, the folded portion11is formed by folding at about ⅘ of the up-down length of the airbag cushion10and the strait portion13is at about ⅕ of the up-down length of the airbag cushion10. In the first exemplary embodiment, the up-down length of the airbag cushion10is 504 mm, in which the length of the folded portion11is ⅘ of 504 mm, 389 mm, which is folded, and the straight portion13is the other, 115 mm. Further, the height H of the folded portion11is 40 mm and the width W defined by the folded portion11and the straight portion13is 20 mm, when the airbag cushion10is folded.

A process of forming the folded portion11and the straight portion13is described. As shown inFIG. 6A, the lower end of the airbag cushion10is folded onto the first side12, to the lower end of the straight portion13. In this position, a first folded portion11ais formed with the first side12overlapping.

Thereafter, as shown inFIG. 6B, a second folded portion11bis formed by folding the lower end of the first folded portion11aonto the first side12, with the second side14overlapping. In the first exemplary embodiment, the second folded portion11bis formed by folding the lower end of the first folded portion11ato the upper end of the first folded portion11a.

Thereafter, as shown inFIG. 6C, the folded portion11is completed by folding the lower end of the second folded portion11bonto the first side12, with the second side14overlapping. The folded portion11is formed by folding the lower end of the second folded portion11bto the upper end of the second folded portion11bin the first exemplary embodiment.

Thereafter, as shown inFIG. 6D, the process of folding the airbag cushion10is finished, with the second side14of the straight portion13overlapping the folded portion11. In the first exemplary embodiment, the straight portion13is positioned to overlap the folded portion11by folding the lower end of the folded portion11at 180° toward the second side14of the straight portion13.

Thereafter, the folded airbag cushion10folded as described above is sealed in the cushion cover30such that it is not unfolded, as shown inFIG. 3, and then the mounting taps15are fastened to the side inner panel6by the fastener7.

As described above, the airbag cushion10folded and mounted to the side inner panel6unfolds like a book while being inflated with the gas generated by the inflator20and flowing into the chamber19in an accident of the vehicle1, such that friction resistance of the airbag cushion10developing is reduced and the pressure for developing inside the vehicle is increased, and accordingly, it is developed inside the vehicle, not outside the vehicle1, thereby protecting the passenger's head. Further, due to the reduction of frictional resistance, the development speed of the airbag cushion10increases, such that it is possible to rapidly protect the passenger. That is, since the airbag cushion10has been folded by rolling the lower end to the upper end and the first side12is in continuous contact with the second side14in the airbag cushion10folded by this rolling method in the related art, large frictional resistance is generated between the first side12and the second side14when the airbag cushion10is unfolded, such that the development pressure and speed of the airbag cushion10are reduced by the frictional resistance. However, the airbag cushion10folded in accordance with the first exemplary embodiment can remove this problem.

Hereafter, the unfolding process of the airbag cushion10according to the first exemplary embodiment of the present invention is described. The unfolding process of the airbag cushion10is made in the reverse order of the folding process. That is, it is unfolded in the order fromFIG. 6DtoFIG. 6Ain the fully unfolded shape shown inFIG. 5.

First, as shown inFIG. 6D, with the airbag cushion10mounted in the vehicle1, when a vehicle accident occurs, the inflator20generates a gas, the straight portion13of the airbag cushion10is inflated by the gas flowing into the straight portion13, and then the gas flows into the folded portion11. The folded portion11overlapping the second side14of the straight portion13is unfolded, as shown inFIG. 6C, while moving away from the second side14of the straight portion13, like a book is opened.

Thereafter, as the folded portion11inflates, the lower end of the second folded portion lib moves away from the upper end of the second folded portion lib, as if a book is opened, and it is unfolded as shown inFIG. 6B.

Thereafter, as the second folded portion11binflates, the lower end of the first folded portion11amoves away from the upper end of the first folded portion11a, as if a book is opened, and it is unfolded as shown inFIG. 6A.

Thereafter, as the first folded portion11ainflates, the lower end of the airbag cushion10moves away from the first side of the airbag cushion10, as if a book is opened, such that the airbag cushion10is completely unfolded, as shown inFIG. 5.

As described above, since the airbag cushion10folded according to the first exemplary embodiment of the present invention is developed while being unfolded, as if a book is opened, the frictional resistance is reduced, as compared with the airbag cushion10that has been folded with the first side12and the second side14are in continuous contact by the rolling method in the related art, such that the pressure for developing inside is increased and accordingly, the airbag cushion10can be developed inside the vehicle1, not toward the outside. Further, the development speed of the airbag cushion10can be increased with the reduction of frictional resistance.

FIG. 7is a side view showing when a curtain airbag cushion10according to a second exemplary embodiment of the present invention has been folded. In the second exemplary embodiment, the same components as those of the first exemplary embodiment are given the same reference numerals and not described in detail, but only differences are described.

Referring toFIG. 7, it can be seen that the curtain airbag cushion10according to the second exemplary embodiment is different from the first exemplary embodiment described above.

That is, a tether40is connected to the portion at the joint of the folded portion11and the straight portion13. In this configuration, the tether40has one end connected to the second side14of the straight portion13and the other end connected to the outer side of the folded portion11.

The tether40is made of a flexible material, and of which one end may be sewn to the second side14of the straight portion13and the other end may be sewn to the outer side of the folded portion11.

The tether40is formed to be able to be cut when the folded portion11is separated from the second side14of the straight portion13. In this configuration, cutting the tether40when the folded portion11is separated from the second side14of the straight portion13is implemented by sewing the tether40to the second side14and the outer side of the folded portion11with a thread that can be cut by the force generated when the folded portion11is separated from the second side14of the straight portion13. Obviously, it may be possible to form small holes in the tether in the perpendicular direction to the direction when the folded portion11is separated from the second side14of the straight portion13such that the tether40can be cut by the small hole by the force generated when the folded portion11is separated from the second side14of the straight portion13.

The tether40restrains the folded portion11when the folded portion11is separated from the second side14of the straight portion13. Therefore, the airbag cushion10is prevented from being overly developed inside the vehicle, such that it is possible to prevent the airbag cushion10from overly developing inside the vehicle and hitting the passenger's head.

It is preferable to connect the tether40to the portion of the airbag cushion10which may be excessively developed inside the vehicle. That is, the tether40may be partially connected to the second side14in the front-rear direction of the airbag cushion10such that the airbag cushion10is not overly developed inside the vehicle.

FIG. 8is a view showing when a curtain airbag cushion10according to a third exemplary embodiment of the present invention has been folded. In the third exemplary embodiment, the same components as those of the first exemplary embodiment are given the same reference numerals and not described in detail, but only differences are described.

Referring toFIG. 8, it can be seen that the curtain airbag cushion10according to the third exemplary embodiment is different from the first exemplary embodiment described above.

That is, although the straight portion13and the folded portion11are directly connected in the first exemplary embodiment described above, a third folded portion11cconnecting the straight portion13with the folded portion11is further formed in the third exemplary embodiment.

The third folded portion11cis formed with the second side14overlapping, and bends at 90° from the straight portion13in contact with the folded portion11.

In this configuration, similar to the first exemplary embodiment, the third folded portion11ccan be formed by forming the folded portion11at about ⅘ portion of the entire up-down length of the airbag cushion10, and forming the straight portion13shorter than the first exemplary embodiment described above. Obviously, the third folded portion11cmay be formed by making the straight portion13about ⅕ of the up-down length of the airbag cushion10and making the folded portion11shorter than the first exemplary embodiment described above (e.g. by folding ⅗ of the airbag cushion10), similar to the first exemplary embodiment described above.

The width of the third folded portion11cis the same as the width defined by the folded portion11and the straight portion13, and the third folded portion supports the entire lower end of the folded portion11in the figure.

As described above, when the third folded portion11cis further formed, two portions are added to the unfolding portion of the airbag cushion10, as compared with the first exemplary embodiment described above, such that the frictional resistance when the airbag cushion is unfolded increases, as compared with the first exemplary embodiment described above, which prevents the airbag cushion10from overly developing inside the vehicle. That is, in the airbag cushion10according to the third exemplary embodiment, the third folded portion11cformed with the second side14overlapping, the folded portion11is then unfolded from the third folded portion11c, and then the other is unfolded in the same order as in the first exemplary embodiment described above, such that as compared with the first exemplary embodiment, the frictional resistance when the airbag cushion10is unfolded increases and accordingly it is possible to prevent the airbag cushion10from overly developing inside the vehicle.

FIG. 9is a side view showing when a curtain airbag cushion10according to a fourth exemplary embodiment of the present invention has been folded. In the fourth exemplary embodiment, the same components as those of the first exemplary embodiment are given the same reference numerals and not described in detail, but only differences are described.

Referring toFIG. 9, it can be seen that the curtain airbag cushion10according to the fourth exemplary embodiment is different from the first exemplary embodiment described above.

That is, although the straight portion13and the folded portion11are directly connected in the first exemplary embodiment described above, an extender11dconnecting the straight portion13with the folded portion11is further formed.

The extender11dbends at 90° from the straight portion13, with the second side14overlapping the folded portion11.

The straight portion13overlaps the folded portion11by folding one end of the folded portion11at 270° toward the second side14while the second side14of the extender11doverlaps the folded portion11.

In this configuration, the extender11dcan be formed by forming the folded portion11by folding about ⅘ of the entire up-down length of the airbag cushion10and making the straight portion13shorter than the first exemplary embodiment, similar to the first exemplary embodiment. Obviously, the extender11dmay be formed by making the straight portion13about ⅕ of the up-down length of the airbag cushion10and making the folded portion11shorter than the first exemplary embodiment described above (e.g. by folding ⅗ of the airbag cushion10), similar to the first exemplary embodiment described above.

As described above, when the extender11dis further formed, one portion is added to the unfolding portion of the airbag cushion10, as compared with the first exemplary embodiment described above, such that the frictional resistance when the airbag cushion is unfolded increases, as compared with the first exemplary embodiment described above, which prevents the airbag cushion10from overly developing inside the vehicle. That is, in the airbag cushion10according to the fourth exemplary embodiment, the folded portion11is unfolded from the second side14of the extender11d, and then the other is unfolded in the same order as in the first exemplary embodiment described above, such that as compared with the first exemplary embodiment, the frictional resistance when the airbag cushion is unfolded increases and accordingly it is possible to prevent the airbag cushion10from overly developing inside the vehicle.

FIG. 10is a side view showing the order of folding a curtain airbag cushion10according to a fifth exemplary embodiment of the present invention. In the fifth exemplary embodiment, the same components as those of the first exemplary embodiment are given the same reference numerals and not described in detail, but only differences are described.

Referring toFIG. 10, it can be seen that the curtain airbag cushion10according to the fifth exemplary embodiment is different from the first exemplary embodiment described above.

That is, forming the first folded portion11aas shown inFIG. 10Aand forming the second folded portion11bas shown inFIG. 10Bare the same as the first exemplary embodiment.

However, forming the folded portion10as shown inFIG. 10Cis different from the first exemplary embodiment. That is, the folded portion11with the second side14overlapping is formed by folding the lower end of the second folded portion lib toward the first side12in the first exemplary embodiment described above; however, the folded portion11with the second side14overlapping is formed by folding the lower end of the second folded portion11btoward the second side14in the fifth exemplary embodiment.

Thereafter, as shown inFIG. 10D, the process of folding the airbag cushion10is finished, with the second side14of the straight portion13overlapping the folded portion11. In the fifth exemplary embodiment, the straight portion13is positioned to overlap the folded portion11by folding the lower end of the folded portion11at 180° toward the second side14of the straight portion13.

As described above, when the folded portion with the second side14overlapping is formed by folding the lower end of the second folded portion11btoward the second side14, the development direction of the airbag cushion10is different from that in the first exemplary embodiment described above, such that it is possible to prevent the airbag cushion10from excessively developing inside the vehicle. That is, the folded portion11in the positions shown inFIG. 6Dis unfolded from the straight portion13into the position shown inFIG. 6Cand then the lower end of the second folded portion lib is unfolded from the upper end of the second folded portion11binto the position shown inFIG. 6Bin the first exemplary embodiment described above; however, the folded portion11in the position shown inFIG. 10Dis unfolded from the straight portion13into the position shown inFIG. 10Cand then the lower end of the second folded portion11bis unfolded from the upper end of the second folded portion11bin the opposite direction to the first exemplary embodiment into the position shown inFIG. 10Bin the airbag cushion10according to the fifth exemplary embodiment, such that it is possible to prevent the airbag cushion10from overly developing inside the vehicle.

FIG. 11is a side view showing the order of folding a curtain airbag cushion10according to a sixth exemplary embodiment of the present invention. In the sixth exemplary embodiment, the same components as those of the first exemplary embodiment are given the same reference numerals and not described in detail, but only differences are described.

Referring toFIG. 11, it can be seen that the curtain airbag cushion10according to the sixth exemplary embodiment is different from the first exemplary embodiment described above.

That is, forming the first folded portion11aas shown inFIG. 11Ais the same as in the first exemplary embodiment.

However, forming the second folded portion11bas shown inFIG. 11Bis different from the first exemplary embodiment. That is, the second folded portion11bwith the second side14overlapping is formed by folding the lower end of the first folded portion11atoward the first side12in the first exemplary embodiment described above; however the second folded portion11bwith the second side14overlapping is formed by folding the lower end of the first folded portion11atoward the second side14in the sixth exemplary embodiment.

Thereafter, as shown inFIG. 11C, the folded portion11is completed by folding the lower end of the second folded portion11bonto the first side12, with the second side14overlapping.

Thereafter, as shown inFIG. 11D, the process of folding the airbag cushion10is finished, with the second side14of the straight portion13overlapping the folded portion11. In the sixth exemplary embodiment, the straight portion13is positioned to overlap the folded portion11by folding the lower end of the folded portion11at 180° toward the second side14of the straight portion13.

As described above, when the second folded portion11bwith the second side14overlapping is formed by folding the lower end of the first folded portion11atoward the second side14, the development direction of the airbag cushion10is different from that in the first exemplary embodiment described above, such that it is possible to prevent the airbag cushion10from overly developing inside the vehicle. That is, the folded portion11in the position shown inFIG. 6Dis unfolded from the straight portion13into the position shown inFIG. 6Cand then the lower end of the second folded portion11bis unfolded from the upper end of the second folded portion11bin the position shown inFIG. 6Bwhile the lower end of the folded portion11ais unfolded from the upper end of the first folded portion11ainto the position shown inFIG. 6Ain the first exemplary embodiment; however, the unfolded portion11in the position shown inFIG. 11Dis unfolded from the straight portion13into the position shown inFIG. 11Cand then the lower end of the second folded portion11bis unfolded from the upper end of the second folded portion11binto the position shown inFIG. 11Bwhile the lower end of the first folded portion11ais unfolded from the upper end of the first folded portion11ain the opposite direction to the first exemplary embodiment described above in the position shown inFIG. 11A, in the airbag cushion10according to the sixth exemplary embodiment, such that it is possible to prevent the airbag cushion10from excessively developing inside the vehicle.

Since the folded portions11of the curtain airbag cushions10according to the exemplary embodiments of the present invention which are folded as described above are unfolded like a book is opened, the frictional resistance is small and the pressure for developing inside the vehicle increases and the development speed correspondingly increases.

It will be understood to those skilled in the art that the present invention may be implemented in various ways without changing the spirit of necessary features of the present invention. Accordingly, the embodiments described above are provided as examples in the whole respects and do not limit the present invention. The scope of the present invention is defined in the following claims and all changed or modified types derived from the meanings and scope of the claims and the equivalent concept thereof should be construed as being included in the scope of the present invention.