Airbag

Details Airbag Airbag

1999-04-29

2001-01-02

Mai, Lanna (Department: 3619)

Land vehicles

Wheeled

Attachment

C280S728100

Utility Patent

active

06168203

ABSTRACT:

BACKGROUND OF THE INVENTION AND RELATED ART STATEMENT
The present invention relates to an airbag of an airbag apparatus which is installed in a vehicle including an automobile and, more particularly, relates to an airbag which is preferable for a passenger's seat.
A conventional airbag having a drum shape for a front passenger's seat consists of three panels. Another airbag consisting of two panels is also known.
The former comprises three panels which are a pair of end panels and one drum panel. The end panels constitute portions corresponding to both drum ends of a drum shape and the drum panel constitutes a portion corresponding to a body-shell of the drum shape. Although this airbag provides a large extent of thickness (the length along a direction from a vehicle occupant to an instrument panel) when inflated, it takes long time to sew up the airbag because it is sewn in three dimensions.
On the other hand, the airbag comprising two panels which are sewn to each other along their peripheries can be easily sewn because it is sewn in two dimensions, but provides a less extent of airbag thickness when inflated.
OBJECT AND SUMMARY OF THE INVENTION
It is an object of the present invention to provide an airbag which can be easily sewn and is capable of providing a large extent of thickness when inflated.
An airbag of a first aspect of the present invention comprises two schematically trapezoidal panels A and B for first and second trapezoidal panels which are sewn together. The panel A includes a side
2
corresponding to a top of a trapezoid, a side
4
corresponding to the base of the trapezoid, and sides
1
and
3
corresponding to the oblique sides of the trapezoid, and has a rectangular recess
5
formed in the middle of the side
4
and protrusions
6
a
,
6
b
protruding from portions of the sides
1
,
3
near the side
4
. The panel B includes a side
12
corresponding to the top of the trapezoid, a side
14
corresponding to the base of the trapezoid, and sides
11
,
13
corresponding to the oblique sides of the trapezoid, and a rectangular protrusion
15
protruding from the middle of the side
14
. The protrusions
6
a
,
6
b
have lateral sides
7
a
,
7
b
continuously connected to the sides
1
,
3
. The side
4
of the panel A has sides
4
a
,
4
b
on both sides of the rectangular recess
5
. The rectangular recess
5
has sides
51
,
53
continuously connected to the sides
4
a
,
4
b
, and a side
52
connecting the sides
51
and
53
. The side
14
of the panel B has sides
14
a
,
14
b
between the both lateral sides
15
a
,
15
b
of the protrusion
15
and the sides
11
,
13
, respectively. The panels A, B are sewn together along the sides
1
,
11
, along the sides
2
,
12
, and along the sides
3
,
13
by a seam
20
. Portions along the sides
4
a
,
4
b
of the panel A are sewn to each other by a seam
30
and edges of the protrusions
6
a
,
6
b
of the panel A and an edge of the protrusion
15
of the panel B are sewn to each other by a seam
40
. Portions along the side
7
a
of the panel A and the side
15
a
and a portion along the side
14
a
of the panel B are sewn to each other by a seam
50
and portions along the side
7
b
of the panel A and the side
15
b
and a portion along the side
14
b
of the panel B are sewn to each other by a seam
50
. Portions along the sides
51
,
53
and a portion along the side
52
of the rectangular recess
5
of the panel A are sewn to each other by a seam
60
.
The following process can be taken as an example to sew up the airbag of the first aspect.
The panels A, B are superposed on each other and then sewn together along the sides
1
,
2
,
3
,
11
,
12
, and
13
by the seam
20
so as to make an envelope body. The envelope body is reversed inside out. The sides
4
a
,
4
b
of the panel A are superposed on each other and portions along the sides
4
a
,
4
b
of the panel A are sewn to each other by the seam
30
. The protrusions
6
a
,
6
b
of the panel A are superposed on the protrusion
15
of the panel B and are sewn up by the seam
40
. After the sides
7
a
,
15
a
are straightened, they are superposed on the side
14
a
of the panel B and sewn by the seam
50
. After the sides
7
b
,
15
b
are straightened, they are superposed on the side
14
b
of the panel B and sewn by the seam
50
. The sides
51
,
53
of the rectangular recess
5
of the panel A are straightened and they are superposed on the side
52
and sewn by the seam
60
. It should be noted that the aforementioned sewing process is just an example and modifications can be taken. The envelope body may not be reversed inside out.
An airbag of a second aspect of the present invention comprises two schematically trapezoidal panels A′ and B which are sewn together. The panel A′ includes a side
2
corresponding to a top of a trapezoid, a side
4
corresponding to the base of the trapezoid, and sides
1
and
3
corresponding to the oblique sides of the trapezoid, and has a rectangular recess
5
formed in the middle of the side
4
. The panel B includes a side
12
corresponding to the top of the trapezoid, a side
14
corresponding to the base of the trapezoid, and includes sides
11
,
13
corresponding to the oblique sides of the trapezoid, and a rectangular protrusion
15
protruding from the middle of the side
14
. The protrusion
15
has sides
15
a
,
15
b
continuously connected to the side
14
and a side
15
c
connecting the sides
15
a
and
15
b
. The side
1
of the panel A′ consists of a side
1
f
superposed on the side
11
of the panel B and a side
1
r
lengthened from the side
1
f
. The side
3
of the panel A′ consists of a side
3
f
superposed on the side
13
of the panel B and a side
3
r
lengthened from the side
3
f
. The side
4
of the panel A′ has sides
4
a
,
4
b
on both sides of the rectangular recess
5
. The rectangular recess
5
has sides
51
,
53
continuously connected to the sides
4
a
,
4
b
, and a side
52
connecting the sides
51
and
53
. The side
14
of the panel B has sides
14
a
,
14
b
between the both lateral sides
15
a
,
15
b
of the protrusion
15
and the sides
11
,
13
, respectively. The panels A′, B are sewn together along the sides
1
f
,
11
, along the sides
2
,
12
, and along the sides
3
f
,
13
by a seam
20
. Portions along the sides
4
a
,
4
b
of the panel A′ are sewn to each other by a seam
30
and a portion along the side
15
a
of the panel A′ and a portion along the side
14
a
of the panel B are sewn to each other by a seam
58
. A portion along the side
15
b
of the panel A′ and a portion along the side
14
b
of the panel B are sewn to each other by a seam
58
and portions along the sides
1
r
,
3
r
of the panel A′ and a portion along the side
15
c
of the panel B are sewn to each other by a seam
48
. Portions along the sides
51
,
53
and a portion along the side
52
of the rectangular recess
5
of the panel A′ are sewn to each other by a seam
60
.
The following process can be taken as an example to sew up the airbag of the second aspect.
The panels A′, B are superposed on each other and then sewn together along the sides
1
f
,
2
,
3
f
,
11
,
12
, and
13
by the seam
20
so as to make an envelope body. The sides
4
a
,
4
b
of the panel A′ are superposed on each other and portions along the sides
4
a
,
4
b
of the panel A′ are sewn to each other by the seam
30
. The sides
1
r
,
3
r
of the panel A′ are superposed on the side
15
c
of the protrusion
15
of the panel B and are sewn up by the seam
48
. The sides
14
a
and
15
a
of the panel B are superposed on each other and are sewn up by the seam
58
. The sides
14
b
and
15
b
of the panel B are superposed on each other and sewn up by the seam
58
. The sides
51
,
53
of the rectangular recess
5
of the panel A′ are straightened and they are superposed on the side
52
and sewn by the seam
60
. It should be noted that the aforementioned sewing process i

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