AIRBAG STRUCTURE

BACKGROUND
1. Field

The present disclosure relates to an airbag structure.

2. Description of the Related Art

With the growing ageing population in modern societies, older population is increasing fast, and accordingly, accidents in elderly population pose a grave social issue. Among such accidents, fall accidents frequently occurs in older adults, and elderly people are physically weak, so surgeries become risky in elderly people, and they have difficulty in recovering after surgeries even though the surgeries are successfully done. Additionally, when fall accidents occur, physical shocks may cause severe injuries to heads, necks and spines. Accordingly, to prevent the injuries caused by fall accidents, protection systems for absorbing impact energy are required.

To protect the human body from fall accidents, a variety of technologies such as hip protectors and wearable airbags have been developed. However, the hip protectors cause inconvenience when worn, so users tend to be reluctant to wear them. In contrast, the wearable airbags are expected to have the performance of preventing injuries to the human body that occur due to falls. However, the conventional wearable airbags are difficult to fabricate airbag structures. As shown in FIG. 9, the conventional airbag structure is fabricated in two dimensions (2D), and subsequently, for 3-dimensional (3D) implementation, sewing adjacent edges is performed. This sewing work is manually performed, resulting in increased manufacturing time and cost and different qualities for each operator.

Moreover, since the conventional airbag structure assumes a 3D shape before fluid injection, it is difficult to fold. Additionally, it is necessary to create a 2D drawing from the 3D shape, which makes it difficult to design. Furthermore, there are lots of leftover spaces between edges and faces on the 2D drawing, resulting in large material consumption and consequential increase in manufacturing costs.

RELATED LITERATURES
Patent Literatures

(Patent Literature 1) KR 10-1302175 B1

SUMMARY

The present disclosure is designed to solve the above-described problem, and an aspect of the present disclosure relates to an airbag structure, in which protrusions are continuously formed along the lengthwise direction of a body, and the body shrinks in length of the side of where the protrusions are formed when a fluid is injected, to form a 3-dimensional (3D) shape.

An airbag structure according to an embodiment of the present disclosure includes a body into which a fluid is injected, wherein a plurality of predetermined points spaced apart from each other is arranged on a side along a lengthwise direction, and a protrusion into which the fluid is injected from the body, the protrusion extending from the two adjacent predetermined points in a direction facing away from the body, wherein the protrusion has a smaller width of a farthest end from the body than a width of an opposite end connected to the body.

Additionally, in the airbag structure according to an embodiment of the present disclosure, when the fluid is injected into the protrusion, the side of the body where the protrusion is formed reduces in length.

Additionally, in the airbag structure according to an embodiment of the present disclosure, when the fluid is injected into the protrusion, the body bends in a direction in which the protrusion is formed.

Additionally, in the airbag structure according to an embodiment of the present disclosure, the protrusion is formed in an arc, quadrangular or triangular shape.

An airbag structure according to another embodiment of the present disclosure includes a first body into which a fluid is injected, wherein a plurality of first predetermined points spaced apart from each other is arranged on one side along a lengthwise direction, a first protrusion into which the fluid is injected from the first body, the first protrusion extending from the two adjacent first predetermined points in a direction facing away from the side of the first body, a second body into which the fluid is injected, the second body positioned parallel to the first body, wherein a plurality of second predetermined points spaced apart from each other is arranged on one side along the lengthwise direction, a second protrusion into which the fluid is injected from the second body, the second protrusion extending from the two adjacent second predetermined points in a direction facing away from the side of the second body, and a connecting portion formed between the first body and the second body, wherein the first protrusion has a smaller width of a farthest end from the first body than a width of an opposite end connected to the first body, and the second protrusion has a smaller width of a farthest end from the second body than a width of an opposite end connected to the second body.

Additionally, in the airbag structure according to an embodiment of the present disclosure, when the fluid is injected into the first protrusion, the side of the first body where the first protrusion is formed reduces in length, and when the fluid is injected into the second protrusion, the side of the second body where the second protrusion is formed reduces in length.

Additionally, in the airbag structure according to an embodiment of the present disclosure, when the fluid is injected into the first protrusion and the second protrusion, the first body, the second body and the connecting portion bend in a direction perpendicular to an imaginary line connecting the side of the first body where the first protrusion is formed and the side of the second body where the second protrusion is formed.

Additionally, the airbag structure according to an embodiment of the present disclosure further includes a third body into which the fluid is injected, the third body extending vertically from an end of the connecting portion, wherein a plurality of third predetermined points spaced apart from each other is arranged on one side along the lengthwise direction, and a third protrusion into which the fluid is injected from the third body, the third protrusion extending from the two adjacent third predetermined points in a direction facing away from the side of the third body, wherein the third protrusion has a smaller width of a farthest end from the third body than a width of an opposite end connected to the third body.

Additionally, in the airbag structure according to an embodiment of the present disclosure, when the fluid is injected into the third protrusion, the side of the third body where the third protrusion is formed reduces in length.

Additionally, in the airbag structure according to an embodiment of the present disclosure, when the fluid is injected into the third protrusion, the third body bends.

The features and advantages of the present disclosure will be apparent from the following detailed description based on the accompanying drawings.

Prior to the description, the terms or words used in the specification and the appended claims should not be construed as being limited to general and dictionary meanings, but rather should be interpreted based on the meanings and concepts corresponding to the technical spirit of the present disclosure on the basis of the principle that the inventor is allowed to define the terms appropriately for the best explanation.

According to the present disclosure, the protrusions are continuously formed along the lengthwise direction of the body, and the body shrinks in length of the side where the protrusions are formed when a fluid is injected, to form a 3D shape, so there is no need to form a 3D shape before fluid injection. Accordingly, it is unnecessary to perform a sewing task for forming a 3D shape, thereby reducing the manufacturing time and cost and preventing the problem with different qualities for each operator.

Additionally, according to the present disclosure, the airbag structure assumes a 2D shape before fluid injection, which makes it easy to fold. Moreover, there is no need to create a complex 2-dimensional (2D) drawing from a 3D shape, so it is easy to design. Additionally, a 2D drawing is unnecessary, so it is possible to prevent the unnecessary material consumption occurring in the leftover spaces between the edges and faces on the 2D drawing.

BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1 to 3 are top views of an airbag structure according to a first embodiment of the present disclosure.

FIG. 4 is a conceptual diagram of a protrusion of an airbag structure according to a first embodiment of the present disclosure.

FIG. 5 is a top view of an airbag structure according to a second embodiment of the present disclosure.

FIG. 6 is a perspective view of an airbag structure according to a second embodiment of the present disclosure. FIG. 7 is a top view of an airbag structure according to a third embodiment of the present disclosure.

FIG. 8 is a perspective view of an airbag structure according to a third embodiment of the present disclosure.

FIG. 9 is a top view of a conventional airbag structure.

DETAILED DESCRIPTION

The objects, particular advantages and new features of the present disclosure will be apparent from the following detailed description and preferred embodiments related to the accompanying drawings. In adding the reference signs to the elements in each drawing, it should be noted herein that like elements have like reference signs as possible although they are shown in different drawings. Additionally, the terms “first”, “second” and the like are used to distinguish an element from another, and the elements are not limited by the terms. Hereinafter, in describing the present disclosure, a detailed description of relevant known technology unnecessarily obscuring the subject matter of the present disclosure is omitted.

Hereinafter, the preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

FIGS. 1 to 3 are top views of an airbag structure according to a first embodiment of the present disclosure.

As shown in FIGS. 1 to 3, the airbag structure according to the first embodiment includes a body 100 into which a fluid is injected, and in which a plurality of predetermined points A spaced apart from each other is arranged on the side along the lengthwise direction, and a protrusion 200 into which the fluid is injected from the body 100, the protrusion 200 extending from the two adjacent predetermined points A in a direction facing away from the body 100, and the protrusion 200 has a smaller width of the farthest end from the body 100 than the width of the opposite end connected to the body 100.

When the fluid is injected from a fluid supply means, the body 100 is inflated. For example, an injection port connected to the fluid supply means may be formed on one side of the body 100. In this instance, the fluid supply means may be an inflator in which a high-pressure gas is stored, and the body 100 may be used as a wearable airbag. In this case, when a control unit detects a wearer's fall, the fluid supply means may supply the fluid to the body 100 through the injection port. Additionally, the protrusion 200 extends from the body 100, and the protrusion 200 is in fluid communication with the body 100. Accordingly, when the fluid is injected into the body 100, the fluid is also injected into the protrusion 200 through the body 100, and the body 100 and the protrusion 200 may be inflated together. As a whole, the body 100 may be extended in a direction. In this instance, the plurality of predetermined points A spaced apart from each other may be arranged on the side of the body 100 along the lengthwise direction. For example, the plurality of predetermined points A spaced apart by a predetermined interval may be arranged on the side of the body 100 along the lengthwise direction. However, the plurality of predetermined points A is not necessarily spaced apart by the predetermined interval, and the interval between the plurality of predetermined points A may be changed according to a predetermined rule or randomly. Here, the plurality of predetermined points A are points from which the protrusion 200 starts, and its detailed description will be provided below.

When the fluid is injected from the body 100, the protrusion 200 is inflated. Here, the protrusion 200 extends from the side of the body 100 in a direction facing away from the body 100 such that the protrusion 200 is in fluid communication with the body 100. As described above, the plurality of predetermined points A spaced apart from each other is arranged on the side of the body 100 along the lengthwise direction, and the protrusion 200 extends from the two adjacent predetermined points A among the plurality of predetermined points A in a direction facing away from the body 100. That is, the two adjacent predetermined points A are points from which the protrusion 200 starts, and the protrusion 200 extends in a direction facing away from the two adjacent predetermined points A. In this instance, the protrusion 200 has a smaller width of the farthest end from the body 100 than the width of the opposite end connected to the body 100. That is, the width of the farthest protruding end of the protrusion 200 is smaller than the width of the opposite end of the protrusion 200 in contact with the body 100. For example, the protrusion 200 may reduce in width as it goes from one end connected to the body 100 to the other end protruding farthest from the body 100. Specifically, the shape of the protrusion 200 is not limited to a particular shape, but may be an arc (see FIG. 1), quadrangular (see FIG. 2) or triangular (see FIG. 3) shape.

As described above, the protrusion 200 has a smaller width of one end (farthest away from the body 100) than the width of the opposite end (connected to the body 100) (as shown in FIG. 1, in case that the shape of the protrusion 200 is an arc shape, the width of the farthest end from the body 100 may, in substance, converge to 0). Accordingly, when the fluid is injected into the protrusion 200, one end width of the protrusion 200 decreases. Specifically, as shown in the enlarged diagram of FIG. 1, when the fluid is injected into the protrusion 200, one end width of the protrusion 200 (the distance between the predetermined points A) decreases (W->D). For example, when the fluid is injected into the protrusion 200, as the protrusion 200 changes from the original 2-dimensional (2D) shape to a 3D shape such as a hemispherical or conic shape, the curvature of the protrusion 200 may increase and one end width of the protrusion 200 may decrease (W->D).

As shown in FIG. 4, when it is assumed that the curvature of the protrusion 200 is very small before fluid injection (when it is assumed that the radius of curvature of the protrusion 200 is very large), it may be assumed that one end width L of the protrusion 200 is equal to the distance W between the predetermined points A in the 2D shape before fluid injection (L=W). Meanwhile, after fluid injection, as the protrusion 200 becomes a 3D shape such as a hemispherical or conic shape, one end width L′ of the protrusion 200 is reduced to L′=D=2W/π.

Accordingly, a change in one end width of the protrusion 200 is represented as ΔL=L′−L=(2/π−1)*W and the maximum change in one end width of the protrusion 200 assumed as a hemisphere is ΔL_max≈−W/3 (|ΔL_max|≈W/3), and one end width L′ of the protrusion 200 after fluid injection is reduced to the level of approximately ⅔ times of one end width L of the protrusion 200 before fluid injection.

For reference, the change in one end width of the protrusion 200 may be adjusted according to the thickness of the protrusion 200 (the degree of protrusion from the body 100), the distance between the predetermined points A, etc.

As described above, when the fluid is injected into each protrusion 200 through the body 100, one end width of each protrusion 200 decreases, and the length of the side of the body 100 where the plurality of protrusions 200 is formed may decrease as a whole. Accordingly, one side of the body 100 where the protrusions 200 are formed becomes shorter in length than the other side of the body 100, and thus the body 100 may bend in a direction in which the protrusions 200 are formed.

FIG. 5 is a top view of an airbag structure according to a second embodiment of the present disclosure, and FIG. 6 is a perspective view of the airbag structure according to the second embodiment of the present disclosure.

As shown in FIGS. 5 and 6, the airbag structure according to the second embodiment includes a first body 110 into which a fluid is injected, and in which a plurality of first predetermined points A1 spaced apart from each other is arranged on one side along the lengthwise direction, a first protrusion 210 into which the fluid is injected from the first body 110, and which extends from the two adjacent first predetermined points A1 in a direction facing away from one side of the first body 110, a second body 120 into which the fluid is injected, positioned in parallel to the first body 110, and in which a plurality of second predetermined points A2 spaced apart from each other is arranged on one side along the lengthwise direction, a second protrusion 220 into which the fluid is injected from the second body 120, and which extends from the two adjacent second predetermined points A2 in a direction facing away from one side of the second body 120, and a connecting portion 300 formed between the first body 110 and the second body 120, and the first protrusion 210 has a smaller width of the farthest end from the first body 110 than the width of the opposite end connected to the first body 110, and the second protrusion 220 has a smaller width of the farthest end from the second body 120 than the width of the opposite end connected to the second body 120.

While the airbag structure according to the first embodiment includes the protrusions 200 on the side of one body 100, the airbag structure according to the second embodiment includes the protrusions (the first and second protrusions 210, 220) on one side of the two bodies (the first and second bodies 110, 120), respectively, and the two bodies (the first and second bodies 110, 120) are connected with the connecting portion 300. Accordingly, overlapping descriptions with the airbag structure according to the first embodiment are omitted and the airbag structure according to the second embodiment will be described based on difference(s).

The airbag structure according to the second embodiment includes the first and second bodies 110, 120 positioned in parallel to each other. Here, the first and second bodies 110, 120 may be inflated when the fluid is injected therein. Additionally, the first protrusion 210 extends from the first body 110, and the second protrusion 220 extends from the second body 120, and thus when the fluid is injected into the first and second bodies 110, 120, the fluid is also injected into the first and second protrusions 210, 220, and the first and second bodies 110, 120 and the first and second protrusions 210, 220 may be inflated together. As a whole, the first and second bodies 110, 120 may be extended in a direction. In this instance, a plurality of first predetermined points A1 spaced apart from each other may be arranged on one side of the first body 110 along the lengthwise direction, and a plurality of second predetermined points A2 spaced apart from each other may be arranged on one side of the second body 120 along the lengthwise direction. Specifically, one side of the first body 110 may be a side that is far away from the second body 120, and one side of the second body 120 may be a side that is far away from the first body 110. In the end, the plurality of first predetermined points A1 may be formed on the side of the first body 110 far away from the second body 120, and the plurality of second predetermined points A2 may be formed on the side of the second body 120 far away from the first body 110. The plurality of first predetermined points A1 are points from which the first protrusion 210 starts, and the plurality of second predetermined points A2 are points from which the second protrusion 220 starts, and thus the first protrusion 210 may be formed on the side of the first body 110 far away from the second body 120, and the second protrusion 220 may be formed on the side of the second body 120 far away from the first body 110.

Here, the first and second protrusions 210, 220 are inflated when the fluid is injected from the first and second bodies 110, 120, and the first and second protrusions 210, 220 extend from one side of the first and second bodies 110, 120 in a direction facing away from the first and second bodies 110, 120 such that the first and second protrusions 210, 220 are in fluid communication with the first and second bodies 110, 120. As described above, the plurality of first predetermined points A1 spaced apart from each other is arranged on one side of the first body 110 along the lengthwise direction, and the first protrusion 210 extends from the two adjacent first predetermined points A1 among the plurality of first predetermined points A1 in a direction facing away from the first body 110. Likewise, the plurality of second predetermined points A2 spaced apart from each other is arranged on one side of the second body 120 along the lengthwise direction, and the second protrusion 220 extends from the two adjacent predetermined second points A2 among the plurality of second predetermined points A2 in a direction facing away from the second body 120. In this instance, the first and second protrusions 210, 220 have a smaller width of the farthest end from the first and second bodies 110, 120 than the width of the opposite end connected to the first and second bodies 110, 120. For example, the first and second protrusions 210, 220 may reduce in width as they go from one end connected to the first and second bodies 110, 120 to the other end protruding farthest from the first and second bodies 110, 120.

Accordingly, when the fluid is injected into the first and second protrusions 210, 220, one end width of the first and second protrusions 210, 220 decreases, and as a result, the length of one side of the first and second bodies 110, 120 where the plurality of first and second protrusions 210, 220 is formed may decrease as a whole. In the end, one side of the first and second bodies 110, 120 where the first and second protrusions 210, 220 are formed becomes shorter in length than the other side of the first and second bodies 110, 120 (the side connected to the connecting portion 300), and thus the first and second bodies 110, 120 and the connecting portion 300 may bend in a direction perpendicular to an imaginary line V connecting one side of the first body 110 and one side of the second body 120. That is, as the first and second protrusions 210, 220 are formed on one side of the first and second bodies 110, 120 respectively, the first and second bodies 110, 120 and the connecting portion 300 do not bend toward the first protrusion 210 formed on one side of the first body 110 or the second protrusion 220 formed on one side of the second body 120, and may bend in a third direction (for example, a direction (a front direction) perpendicular to one surface of the connecting portion 300, see the arrow of FIG. 6). Meanwhile, an inflatable portion 135 may be equipped at one end of the first and second bodies 110, 120 and the connecting portion 300. Here, the inflatable portion 135 is in fluid communication with the first and second bodies 110, 120 and the connecting portion 300, and the fluid may be injected into the first and second bodies 110, 120 and the connecting portion 300 through the inflatable portion 135. In this instance, the inflatable portion 135 may be positioned at the wearer's waist. Accordingly, when it inflates, the inflatable portion 135 may protect the wearer's waist, and the first and second bodies 110, 120 and the connecting portion 300 may protect the wearer's hip.

FIG. 7 is a top view of an airbag structure according to a third embodiment of the present disclosure, and FIG. 8 is a perspective view of the airbag structure according to the third embodiment of the present disclosure.

Basically, the airbag structure according to the third embodiment further includes a third body 130 and a third protrusion 230 in addition to the airbag structure according to the second embodiment. Accordingly, overlapping descriptions with the airbag structure according to the second embodiment are omitted, and the airbag structure according to the third embodiment will be described based on the third body 130 and the third protrusion 230.

The third body 130 of the airbag structure according to the third embodiment may be inflated when the fluid is injected therein. Additionally, the third protrusion 230 extends from the third body 130, and thus when the fluid is injected into the third body 130, the fluid is also injected into the third protrusion 230, and the third body 130 and the third protrusion 230 may be inflated together. Meanwhile, the third body 130 extends vertically from the end (the upper end) of the first and second bodies 110, 120 and the connecting portion 300, and is in fluid communication with the first and second bodies 110, 120 and the connecting portion 300, and thus when the fluid is injected into the third body 130, the fluid may be also injected into the first and second bodies 110, 120 and the connecting portion 300, and the first and second bodies 110, 120 and the connecting portion 300 may be inflated. As a whole, the third body 130 may be extended in a direction. In this instance, a plurality of third predetermined points A3 spaced apart from each other may be arranged on one side of the third body 130 along the lengthwise direction. Specifically, one side of the third body 130 may be a side that is far away from the first and second bodies 110, 120 and the connecting portion 300. In the end, the plurality of third predetermined points A3 may be formed on the side of the third body 130 far away from the first and second bodies 110, 120 and the connecting portion 300. The plurality of third predetermined points A3 are points from which the third protrusion 230 starts, and thus the third protrusion 230 may be formed on the side of the third body 130 far away from the first and second bodies 110, 120 and the connecting portion 300.

Here, the third protrusion 230 is inflated when the fluid is injected from the third body 130, and the third protrusion 230 extends from one side of the third body 130 in a direction facing away from the third body 130 such that the third protrusion 230 is in fluid communication with the third body 130. As described above, the plurality of third predetermined points A3 spaced apart from each other is arranged on one side of the third body 130 along the lengthwise direction, and the third protrusion 230 extends from the two adjacent third predetermined points A3 among the plurality of third predetermined points A3 in a direction facing away from the third body 130. In this instance, the third protrusion 230 has a smaller width of the farthest end from the third body 130 than the width of the opposite end connected to the third body 130. For example, the third protrusion 230 may reduce in width as it goes from one end connected to the third body 130 to the other end protruding farthest from the third body 130.

Accordingly, when the fluid is injected into the third protrusion 230, one end width of the third protrusion 230 decreases, and as a result, the length of one side of the third body 130 where the plurality of third protrusions 230 is formed may decrease as a whole. In the end, as one side of the third body 130 where the third protrusions 230 are formed becomes shorter in length than the other side (the side close to the first and second bodies 110, 120 and the connecting portion 300) of the third body 130, the third body 130 may bend. As described above, when the third body 130 bends, the third body 130 may form a 3D shape to conform to the wearer's waist.

Meanwhile, when the fluid is injected into the first and second protrusions 210, 220 through the first and second bodies 110, 120 respectively, one end width of each of the first and second protrusions 210, 220 decreases, and the length of one side of the first and second bodies 110, 120 where the plurality of first and second protrusions 210, 220 is formed may decrease as a whole. Accordingly, as one side of the first and second bodies 110, 120 where the first and second protrusions 210, 220 are formed becomes shorter in length than the other side (the side connected to the connecting portion 300) of the first and second bodies 110, 120, the first and second bodies 110, 120 may bend (see the arrow of FIG. 8). When the first and second bodies 110, 120 bend, the first and second bodies 110, 120 may form a 3D shape to conform to the wearer's hip.

In the end, the airbag structure according to this embodiment may form a 3D shape to conform to the wearer's waist as the third body 130 bends, and at the same time, may form a 3D shape to conform to the wearer's hip as the first and second bodies 110, 120 bend, when the fluid is injected. Accordingly, in the event of a fall, when the fluid is injected, the first, second and third bodies 110, 120, 130 and the first, second and third protrusions 210, 220, 230 may stably protect the wearer's waist and hip.

In addition, the airbag structure according to this embodiment may further include an auxiliary inflatable portion 140. The auxiliary inflatable portion 140 extends from the third body 130 (extends from two sides of the third body 130), and may be formed in an annular shape such that one end and the other end are in fluid communication with the third body 130. Here, the auxiliary inflatable portion 140 may protect the wearer's hip when it inflates.

The airbag structure according to the present disclosure includes the protrusions 200 (or the first, second and third protrusions 210, 220, 230) continuously formed along the lengthwise direction of the body 100 (or the first, second and third bodies 110, 120, 130) to form a 3D shape when the fluid is injected, so there is no need to form a 3D shape before fluid injection. Accordingly, it is unnecessary to perform a sewing task for forming a 3D shape, thereby reducing the manufacturing time and cost and preventing the problem with different qualities for each operator. Additionally, the airbag structure assumes a 2D shape before fluid injection, which makes it easy to fold. Moreover, there is no need to create a complex 2D drawing from the 3D shape, so it is easy to design. Additionally, a 2D drawing is unnecessary, so there is no leftover space between the edges and faces on the 2D drawing, thereby preventing unnecessary material consumption.

Meanwhile, the airbag structure according to the present disclosure is not limited to a particular fabrication method, and may be fabricated by any well-known fabrication method, for example, seam sealing technology (sewing after seam taping), thermoplastic polyurethane (TPU) film technology (sealing with a TPU film) or One Piece Woven (OPW) technology.

Additionally, although the foregoing description describes that the airbag structure according to the present disclosure is used in a wearable airbag, the airbag structure according to the present disclosure is not limited thereto and may be used in any type of airbag including vehicle airbags.

Although the present disclosure has been described in detail through specific embodiments, this is provided to describe the present disclosure in detail, and the present disclosure is not limited thereto, and it is obvious to those skilled in the art that modifications or changes may be made thereto within the technical spirit of the present disclosure.

Such modifications or changes of the present disclosure fall within the scope of the present disclosure, and the scope of protection of the present disclosure will be defined by the appended claims.

[Detailed Description of Main Elements]

100: Body
110: First body

120: Second body
130: Third body

135: Inflatable portion
140: Auxiliary inflatable portion

200: Protrusion
210: First protrusion

220: Second protrusion
230: Third protrusion

300: Connecting portion
A: Predetermined point

A1: First predetermined point
A2: Second predetermined point

A3: Third predetermined point

W: Distance between predetermined

points in 2D shape

D: Distance between predetermined

points in 3D shape

L: One end width of protrusion before

fluid injection

L′: One end width of protrusion

after fluid injection

V: Imaginary line

AIRBAG STRUCTURE

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Priority Claims (1)