JPH11342816A - Vehicular air bag device and its casing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicular air bag device capable of opening a casing without scattering the breaking part of the casing after its breakage in developing an air bag by positively retaining a closed state between a casing member constituting the casing for housing an air bag by hinge connection and a cover member except for developing the air bag. SOLUTION: The cover member 40 of a casing C at its front wall 44 is provided with an engaged tongue part 44 (front wall side). Both the side walls 42 are provided with engaged tongue parts 43 (side wall side), respectively. A casing member 30 at its front wall 35 is provided with engaging projections 36 (front wall side) engaged with the engaging hole parts 45a of the engaged tongue part 45 (front wall side). Both the side walls 33 are provided with engaging projections 34 (side wall side), respectively engaged with the engaging hole parts 43a of the engaged tongue parts 43 (side wall side). In addition, the engaged tongue parts 43 (side wall side) have brittle parts 43b, respectively. The engaged tongue part 45 (front wall side) has brittle parts 45b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a vehicle airbag device and a casing thereof.

[0002]

2. Description of the Related Art A conventional airbag device for a vehicle is disclosed, for example, in Japanese Patent Application Laid-Open No. 9-315252. The airbag device includes a casing that houses the inflator and the airbag, and the casing includes a casing member and a cover member that are hinged to each other at a rear portion thereof.

Here, a hoop is formed at the front edge of the casing member so as to project toward the front wall of the cover member.
On the front wall of the cover member, a bifurcated cross section arm having a latch tongue on the inside is formed so as to project toward the hoop. Here, at least the outer arm portion of the arm has elasticity. Then, when the casing member is closed by the cover member, the hoop is inserted into the arm against the elasticity of the elastic arm portion and automatically fits with the latch tong. As a result, the hoop is engaged in the bifurcated arm through the latch tongue.

[0004] The hoop has a thin-walled broken portion at a base protruding from the front wall of the casing member. Thus, when the airbag is inflated, the front wall of the casing member is separated from the hoop by breaking the break portion, and the cover member opens from the casing member to open the casing.

[0005]

By the way, in the casing of the airbag device, since the hoop is engaged through the latch tongue in the bifurcated arm in cross section, the broken portion is broken when the airbag is inflated as described above. Even so, the hoop remains retained by the latching tongue in the bifurcated arm. For this reason, even if the airbag is deployed from the inside of the casing to the front, the hoop does not scatter.

Further, as described above, since the hoop is engaged in the arm having a bifurcated cross section through the latch tongue,
Even if the casing receives mechanical vibration, the cover member does not open the casing member. However, in the above-mentioned casing, the hoop formed as described above and the bifurcated arm in cross section are employed as the casing holding structure in a closed state. For this reason, there is a problem that the holding structure is complicated and difficult to form.

Further, the hoop is engaged with the arm having a bifurcated cross section through a latch tongue in a direction along the front wall of the casing. Therefore, when an external force or vibration is applied to the casing in a direction along the front wall, even if the hoop does not come off from the bifurcated arm in cross section, the casing has a front wall in the crossing direction (for example, a little more than a right angle). When an external force is applied from a small angle direction), the bifurcated arm is bent in the bifurcated direction, and the hoop is likely to come off the latch tongue. This means that the hoop may be disengaged from the bifurcated arm, depending on how the external force is applied to the front wall of the casing.

In order to cope with such a problem, the present invention changes the closed state between the casing member and the cover member, each of which includes a casing for accommodating the airbag by hinge connection, except when the airbag is deployed. It is an object of the present invention to provide a vehicle airbag device and a casing thereof, wherein the casing is securely held, and when the airbag is deployed, the casing is opened without scattering of the broken portion due to the breaking of the broken portion of the casing.

[0009]

According to the first aspect of the present invention, there is provided an airbag device for a vehicle, comprising: a casing member (30); and a rear wall (37) of the casing member. And a cover member (40) hinged to the rear edge (41) so as to be openable and closable, and provided with holding means (45, 36) for holding the casing in a closed state. A casing (C) and an airbag (60) housed in a casing member so as to open and expand the casing when gas is supplied from the inflator (50).

The holding means extends from one front wall (35, 44) of the casing member and the cover member toward the other front wall of the casing member and the cover member to form the engaging hole (45a). Front wall side engaged tongue portion (45) having
And a front wall-side engaging projection projecting from the outer surface of the other front wall of the casing member and the cover member in a direction intersecting the front wall side so that the front wall-side engaging projection cannot escape when the airbag is deployed. A front wall-side engaging projection (36) that engages in the engaging hole of the engaging tongue;
At the outer periphery of the engagement hole, a fragile portion (45b, 45b, which has a strength such that the front wall-side engagement protrusion is broken from the other front wall of the casing member and the cover member without cutting when the airbag is deployed. 45d).

Thus, when the casing is opened by deployment of the airbag, the weakened portion of the tongue to be engaged on the front wall is broken by the engagement protrusion on the front wall. Here, as described above, the fragile portion has such a strength that the fragile portion breaks without cutting the front wall side engaging projection from the other front wall of the casing member and the cover member when the airbag is deployed.

Therefore, even if each fragile portion is broken as described above, the front wall side engaging projection does not scatter. Further, the closed state of the casing is held by the engagement of the front wall side engaging projection with the engaging hole of the front wall side engaged tongue as described above, so that the casing intersects the front wall. Even if an external force or vibration is applied, the casing does not open carelessly.

According to the second aspect of the present invention, an airbag device for a vehicle includes a casing member (30) and a rear wall (37) that can be opened and closed by a rear wall (37) of the casing member.
A casing (C) having a cover member (40) hinged at 1) and having a holding means (34, 43) for holding the casing closed, and an inflator; An airbag (60) housed in the casing member so as to open and expand the casing when gas is supplied from (50).

The holding means extends from one of the side walls (33, 42) of the casing member and the cover member toward the other side wall of the casing member and the cover member, respectively. And each of the side wall engaged tongues (43) having the following, and each side wall side engaging projection protruding from the other side surface of the other side wall of the casing member and the cover member in a direction crossing the outer surface. A side wall-side engaging projection (34) that is engaged with the engaging hole of each side wall-side engaged tongue to such an extent that it cannot escape when the bag is deployed; Is a fragile portion having such a strength that the side wall side engaging projections are broken at the outer peripheral portion of the engaging hole portion without cutting each side wall side engaging projection from the other side wall of the casing member and the cover member when the airbag is deployed. 43b,
43d).

Thus, when the casing is opened by deployment of the airbag, the fragile portion of each tongue to be engaged on each side wall is broken by each of the engagement protrusions on the side wall. Here, as described above,
Each fragile portion has such strength that the side wall-side engaging protrusions are broken from the other side walls of the casing member and the cover member when the airbag is deployed, without cutting.

Therefore, even if each fragile portion is broken as described above, each side wall-side engaging projection does not scatter. Also,
As described above, the closed state of the casing is maintained by the engagement of each side wall-side engaging tongue with the engagement hole of each side wall-side engaged tongue, so that an external force that intersects the side wall is applied to the casing. Even if vibration is applied, the casing does not open carelessly.

According to a third aspect of the present invention, in the vehicle airbag device according to the first aspect, the holding means further includes one of both side walls (33, 42) of the casing member and the cover member. , Each side-side engaged tongue (43) extending toward the other side wall of the casing member and the cover member and having an engagement hole (43a), and the other side of the casing member and the cover member Each of the side wall-side engaging projections protruding from the outer surface of the wall in a direction intersecting with the outer surface, so that the protrusions cannot escape when the airbag is deployed. And a side wall side engaging projection (34) to be engaged, and each side wall side engaged tongue portion is broken at the outer peripheral portion of the engaging hole when the airbag is deployed. From the strength of the fragile part of each engaged tongue on the front wall side Weak portion having a greater intensity (43
b, 43d).

Thus, the functions and effects of the first and second aspects of the present invention can be further improved. According to the invention described in claim 4, in the vehicle airbag device according to any one of claims 1 to 3, the casing is formed of an elastic synthetic resin material, and each of the engagement protrusions is The heads (34a, 36a) which are inserted into the engagement holes of the corresponding tongues to be engaged with the engagement holes to such an extent that they cannot escape when the airbag is deployed. ).

According to this, the operation and effect of the invention according to any one of claims 1 to 3 can be achieved. Further, according to the inventions described in claims 5 to 8, a casing suitable for adopting the airbag device according to the inventions described in claims 1 to 4 can be provided.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a side collision type airbag apparatus A according to the present invention assembled in a vertically intermediate portion of a right side wall 11 of a seat back 10a of a driver's seat 10 of a vehicle. Note that the right side wall 11 of the seat back 10a is shown in FIG.
And the right rear door 20 of the vehicle as shown in FIG.
a and the right center pillar 20c located between the rear door 20a and the right front door 20b.

The airbag device A includes a casing C as shown in FIGS. 2, 3, 4 and 7. The casing C has a casing member 30 having a substantially U-shaped cross section.
And a cover member 40, and are integrally formed in an approximately L-shape with an elastic synthetic resin material. The casing C is covered by a right side wall portion of the skin 10b of the seat back 10a.

The casing member 30 is housed in a recess 11a formed in the right side wall 11 of the seat back 10a at a front portion 31a of the bottom wall 31. The casing member 30 is substantially the same as the bottom wall 31. The bolt 32a extending from the L-shaped rear portion 31b and the nut 32b are fastened to each other and supported by a part 12 of the frame in the seat back 10a.

At the intermediate portion of the casing member 30 in the front-rear direction of the left and right side walls 33 shown in FIG. 4, both side wall side engaging projections 34 are respectively directed outward as illustrated in FIGS. It is formed so as to have a T-shaped cross section. here,
Each side wall-side engaging projection 34 is provided on the side wall 3 of the casing member 30.
3 has a leg 34b projecting at right angles to the outer surface of the leg 3 and a head 34a formed at the outer end of the leg 34b in a T-shape.

On the front wall 35 of the casing member 30, both front-side engaging projections 36 are formed so as to protrude outwardly in a T-shaped cross section at an interval from each other as shown in FIG. . The front engagement projections 36 have substantially the same configuration as the side wall engagement projections 34, and the front engagement projections 36 respectively correspond to the legs 34b and the head 34a. It has a leg 36b and a head 36a.

As shown in FIG. 3, the cover member 40 is integrated with a rear wall 37 of the casing member 30 at a rear edge 41 and is hingedly connected to the rear wall 37 so as to be openable and closable. In the front-rear direction intermediate portion of the left and right side walls 42 in FIG. 4 of the cover member 40, the both side wall engaged tongues 4 which are removably engaged with the both side wall engagement projections 34.
3 are integrally formed, as illustrated in FIGS. 4 to 6.

The engaged tongues 43 on both side walls have the same configuration. Therefore, a configuration of the side wall side engaged tongue 43 illustrated in FIG. 5 will be described as an example. 5 is the engaged tongue portion 43 located on the left side in FIG. The side wall side engaged tongue 43
4 extends downward in the figure from the front-rear direction intermediate portion of the left side wall 42 shown in FIG. 4 of the cover member 40, and a corresponding side wall side engaging projection is provided at the center of the side wall side engaged tongue 43. 3
4 is formed with an engagement hole 43a.

In this embodiment, even when the casing C is opened along with the deployment of the airbag 60, the side wall-side engaging projections 3 are provided.
4 has an engagement hole 43 of the side wall side engaged tongue 43.
5A, the side wall-side engaging projections 34, the side wall-side engaged tongues 43, and the respective shape dimensions of the engaging holes are set so that the engaging holes 43a are not escapable. The opening width in the vertical direction in the drawing is the head 34 of the side wall side engagement protrusion 34.
a is smaller than the width in the vertical direction in the figure,
Is set to be larger than the illustrated vertical width of the leg 34b.

Here, the side wall-side engaging projection 34 has its head 34a in a direction orthogonal to the side wall of the casing C.
The side wall side engaging tongue 43 is inserted into and engaged with the engaging hole 43a against its elasticity. At this time, the engagement hole 43a
By setting the opening width in the vertical direction in relation to the head 34a of the side wall-side engaging protrusion 34, the head 34a of the side wall-side engaging protrusion 34 is formed by the engaging hole 43a of the side wall-side engaged tongue 43. It will be locked.

The engaged tongue 43 on the side wall side has a weak portion 4
3b, and the V-shaped notch is formed in a portion 43c of the outer edge of the side wall side engaged tongue 43 which corresponds to the center of the engaging hole 43a in FIG. Is formed. Here, the fragile part 43b
When the casing C is opened with the deployment of the airbag 60, the side wall side engaging projections 34 are broken so as not to be cut from the respective side walls 33 of the casing member 30. Is set to have a strength such that it is not broken by an external force or vibration from any direction.

Further, a front engaged tongue 45 corresponding to both front engagement projections 36 is formed integrally with the front wall 44 of the cover member 40 at an intermediate portion in the left-right direction as shown in FIG. The front engaged tongue 45 extends downward from an intermediate portion in the left-right direction of the front side wall 44 of the cover member 40. The front wall engaged tongue 45 has two front wall engaging protrusions. The two engagement holes 45a are formed so as to be releasably engaged with each other.

In the present embodiment, even when the casing C is opened with the deployment of the airbag 60, the front wall side engaging projections 3 can be opened.
6 has an engaging hole 45 of the front wall side engaged tongue 45.
a, the front wall side engaging protrusion 36, the front wall side engaged tongue 45, and the shape and size of the engaging hole 45a are set so that the front wall side engaging projection 36, the front wall engaged tongue 45 and the engaging hole 45a are retained. In FIG. 7, the vertical opening width in the illustrated vertical direction is smaller than the illustrated vertical width of the head portion 36a of the front wall side engaging projection 36, and is smaller than the illustrated vertical width of the leg portion 36b of the front wall side engaging projection 36. It is set large.

Here, the front wall side engaging projections 36 are formed at their respective heads 36a in the direction perpendicular to the front wall of the casing C in the engaging hole portions of the front wall engaged tongue 45. 45a are respectively inserted and engaged against their elasticity. At this time, by setting the opening width in the vertical direction in relation to the head 36a of the front wall-side engagement projection 36 of the engagement hole 45a, the head 36a of the front wall-side engagement projection 36 is moved forward. The engagement tongue 45 is retained by the engagement hole 45a.

The front-wall-side engaged tongue 45 has both weakened portions 45b. The V-shaped cutout 45a is formed in each portion 45c corresponding to the center in the left-right direction in FIG. 7 of FIG. Here, the both fragile portions 45b are broken together so as not to cut the front wall side engaging projections 36 from the front wall 35 of the casing member 30 when the casing C is opened with the deployment of the airbag 60, and At the time other than the time of opening, due to external force or vibration from any direction to the casing C,
It is set to have a strength that does not break.

Further, the fragile portion 4 of each engaged tongue 43 on the side wall side
The strength of 3b is such that it is broken when the airbag 60 is deployed, and is set to be larger than the strength of the weak portion 45b of each front wall side engaged tongue 45. In the present embodiment,
The front wall side engaged tongue piece 45 and both front wall side engagement projections 36, the both side wall side engaged tongue 43 and both side wall side engagement projections 34,
The cover member 40 for the casing member 30 respectively
Serves as a holding means.

The inflator 50 is housed in the opening of the airbag 60 in the rear part of the casing C, and is retained by its retainer 51 via the bottom wall 31 of the casing member 30.
The bolt 32a and the nut 32b are fixed to the part 12 of the frame by tightening. The airbag 60
Is folded and stored in the front portion of the casing C so as to be deployable in front of the casing.

In the present embodiment configured as described above,
When the airbag 60 is supplied with gas from the inflator 50 in accordance with the collision with the front door 20b of the vehicle, the airbag 60 generates a force in the direction of separating the cover member 40 from the casing member 30 by the gas pressure. Start to swell. Accordingly, the cover member 40
Between the engagement holes 43a of the both-side wall engaged tongues 43 and the both-side engagement protrusions 34 of the casing member 30, and between the engagement holes 45a of the front wall-side engaged tongues 45. Both front wall side engaging projections 3
6, a separating force due to the inflation of the airbag 60 acts.

Thereafter, when the airbag 60 further expands and exerts a force to open the casing C, the weak portions 45b of the front-wall-side engaged tongues 45 and the side-wall-side engaged tongues 43 Each fragile portion 43b is broken. Here, as described above, the strength of the fragile portion 43b of each side wall engaged tongue 43 is such that the fragile portion 43b of each front wall side engaged tongue 45 is broken when the airbag 60 is deployed. Is set to be greater than the strength of

Therefore, first, after each weak portion 45b of both front wall side engaged tongue portions 45 is broken by each front wall side engaging protrusion 36, each weak portion of both side wall side engaged tongue portions 43 is broken. The part 43b is
As shown in FIG. 9 and FIG.
Is broken by As a result, the casing C is opened from the front wall to the rear part, so that the airbag 6 is opened.
0 unfolds smoothly to the front of the casing C as shown in FIG.

The strength of each of the weak portions 43b and 45b is set as described above in relation to the strength of each of the engagement projections 34 and 36. For this reason, even if each weak part 43b, 45b breaks as mentioned above, each engaging projection 34, 36 is not cut off from each side wall 33 and the front wall 35 of the casing member 30, and does not scatter. In addition, as described above, since the strength of each of the fragile portions 43b and 45b is set in relation to the strength of each of the engagement protrusions 34 and 36, the front wall of the casing C (before the deployment of the airbag 60). Both front walls 35, 4
4), the cover member 40 retains the engaged tongues of the engaging projections 34 and 36 even when an external force is applied from the direction of the arrow shown in FIG. 4 or mechanical vibration is applied to the casing C. Engagement of the portions 43 and 45 with the engagement holes allows the casing member 30 to hold it firmly. Therefore, the casing C does not open carelessly.

FIGS. 11 to 13 show modifications of the above embodiment. In this modification, both fragile parts 43d are
As shown in FIGS. 11 and 12, instead of each weak portion 43 b described in the above embodiment, the outer peripheral portion of the engaging hole 43 a of the engaged tongue 43 on both side walls of the cover member 40 is shown. The front side portion is formed with a lower strength than the remaining portion of the outer peripheral portion.

Further, both fragile portions 45d are formed as shown in FIGS.
As shown by 2, each fragile part 4 described in the above embodiment
5b, the tongue 45 on the front wall side of the cover member 40
Are formed on the left and right side wall portions of the outer peripheral portion of each of the engagement holes 45a with a lower strength than the remaining portion of the outer peripheral portion. However, the strengths of both the fragile portions 43d and the both fragile portions 45d are the same as those of the fragile portions 4 described in the above embodiment.
The strength is set in the same manner as in the case of each strength of 3b and both weak portions 45b. Other configurations are the same as in the above embodiment.

In this modified example configured as described above, when the casing C is opened by deploying the airbag 60 in the same manner as in the above-described embodiment, each fragile portion 4 of each of the front wall side engaged tongues 45 is opened.
5d and the respective weakened portions 43d of the both-side wall-side engaged tongue 43 are broken. Here, as described above, the strengths of both the weak portions 43d and the weak portions 45d are set in the same manner as the strengths of the weak portions 43b and the weak portions 45b described in the above embodiment. The strength of each fragile portion 43 b is such that the air bag 60 breaks when deployed,
Greater than 5d strength. In addition, each vulnerable part 43d, 45
The strength of d is the same as that of the weak parts 43b, 45b in relation to the strength of the engaging projections 34, 36.

Accordingly, first, each weak portion 45d is broken by each front wall side engaging protrusion 36, and then each weak portion 43d is broken by each side wall side engaging protrusion 34 (see FIG. 13). At this time, even if the fragile portions 43d and 45d break as described above, the engaging projections 34 and 36 are not cut off from the side walls 33 and the front wall 35 of the casing member 30 and scattered. Other functions and effects are the same as those of the above embodiment.

In practicing the present invention, the front wall side engaged tongue 45 may be provided for each engagement hole 45a.
Further, the numbers of the front-wall-side engaged tongue pieces 45 and the engagement hole portions 45a may be appropriately changed and implemented. Further, in implementing the present invention, the side wall side engaged tongue portion 43 may be a single common tongue portion common to both engagement hole portions 43a. In addition, the side-wall-side engaged tongue portion 43
The number of the side wall-side engaging projections 34 may be appropriately changed and implemented on both side walls 42 of the cover member 40.

In practicing the present invention, the side wall engaged tongues 43 and the front wall side engaged tongues 45 are replaced with the side wall side engaging projections 34 and the front wall side engaging projections 36, respectively. And formed on the casing member 30, and
4 and each front wall side engaging projection 36 is connected to each side wall side engaged tongue 4
3 and the front wall side engaged tongue 45,
May be formed.

In practicing the present invention, the casing member may be formed to have a U-shaped cross section, and the inflator G may be provided externally. Further, the casing member does not have to have a U-shaped cross section. In practicing the present invention, the present invention is not limited to the side collision type airbag device, and may be applied to various airbag devices.

In practicing the present invention, the airbag device A may be assembled to an intermediate portion of the right side wall 11 of the seat back 10a while being exposed to the outside. In practicing the present invention, the airbag device A is not limited to the seatback 10a, but may be housed in, for example, the right front door 20b.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state in which a vehicle airbag device according to the present invention is assembled in a right side wall of a seat back of a driver seat.

FIG. 2 is a partially enlarged sectional view taken along line 2-2 in FIG.

FIG. 3 is a sectional view of the airbag device of FIG. 2;

FIG. 4 is an enlarged perspective view of a casing.

FIG. 5 is a partial side view of a casing.

FIG. 6 is a sectional view taken along line 6-6 in FIG.

FIG. 7 is an enlarged perspective view of the casing in an opened state.

FIG. 8 is an enlarged perspective view of a casing showing a state in which a fragile portion is broken.

9 is a side view of a main part showing a fragile portion of the casing of FIG. 8 in a broken state.

FIG. 10 is a sectional view taken along the line 10-10 in FIG. 9;

FIG. 11 is an enlarged perspective view of a casing showing a modification of the embodiment.

FIG. 12 is a perspective view showing a state where the casing of FIG. 11 is opened.

FIG. 13 is a perspective view showing a broken state of a fragile portion of the casing of FIG.

[Explanation of symbols]

C: Casing, 30: Casing member, 33, 42 ...
Side wall, 34 ... Side wall side engagement projection, 34a, 36a ... Head, 35, 44 ... Front wall, 36 ... Front wall side engagement projection, 37 ...
Rear wall, 40: cover member, 41: rear edge, 43: side wall side engaged tongue, 43a, 45a: engagement hole, 43b, 43
d, 45b, 45d: fragile portion, 45: front-wall-side engaged tongue portion, 50: inflator, 60: airbag.

Claims (8)

[Claims] A casing member (30) and a cover member (40) hinged to a rear wall (37) of the casing member at a rear edge (41) so as to be openable and closable. A casing (C) provided with holding means (45, 36) for holding the casing in a closed state.
An airbag device for a vehicle, comprising: an airbag (60) housed in the casing member so as to open and expand the casing when gas is supplied from an inflator (50). One of the front walls of the casing member and the cover member (3
5, 44) extending toward the other front wall of the casing member and the cover member and having a front wall-side engaged tongue (45) having an engagement hole (45a); and the casing member and the cover. A front wall-side engaging tongue protruding from the outer surface of the other front wall in a direction crossing the outer front surface of the member so that the front wall-side engaging tongue cannot escape when the airbag is deployed. And a front wall-side engaging projection (36) that engages in the engaging hole of the front wall.
A fragile portion (45b, 45b having a strength such that the front wall-side engaging projection is broken without being cut from the other front wall of the casing member and the cover member when the airbag is deployed.
45d). A vehicle airbag device comprising: 2. A casing member (30) and a cover member (40) hinged to a rear wall (37) of the casing member at a rear edge (41) so as to be openable and closable. A casing (C) provided with holding means (34, 43) for holding the casing in a closed state.
An airbag device for a vehicle, comprising: an airbag (60) housed in the casing member so as to open and expand the casing when gas is supplied from an inflator (50). One side wall (3) of the casing member and the cover member
3, 42) to the other side walls of the casing member and the cover member, respectively, to engage with the engagement holes (43, 43).
a) and each side wall engaging tongue (43) having a) and each side wall side engaging projection protruding from the outer surface of the other side wall of the casing member and the cover member in a direction crossing the outer surface. And each side wall-side engaging projection (34) that engages in an engaging hole of each side wall-side engaged tongue to such an extent that it cannot escape when the airbag is deployed. The side engaged tongue portion is broken at the outer peripheral portion of the engaging hole without cutting the side wall side engaging projections from the other two side walls of the casing member and the cover member when the airbag is deployed. An airbag device for a vehicle, comprising a fragile portion (43b, 43d) having a sufficient strength. 3. The holding means further includes one of both side walls (3) of the casing member and the cover member.
3, 42) to the other side walls of the casing member and the cover member, respectively, to engage with the engagement holes (43, 43).
a) and each side wall engaging tongue (43) having a) and each side wall side engaging projection protruding from the outer surface of the other side wall of the casing member and the cover member in a direction crossing the outer surface. And each side wall-side engaging projection (34) that engages in the engaging hole of each side wall-side engaged tongue to such an extent that it cannot escape when the airbag is deployed. The to-be-engaged tongue portion is of such a strength that it is broken at the outer peripheral portion of the engagement hole when the airbag is deployed, and is greater than the strength of the weak portion of each of the front-wall-side tongue portions. The airbag device for a vehicle according to claim 1, further comprising a fragile portion (43b, 43d) having: 4. The casing is formed of an elastic synthetic resin material, and each of the engaging projections is inserted into an engaging hole of the corresponding tongue to be engaged against its elasticity. 2. A head (34a, 36a) which engages with said engagement hole to such an extent that it cannot escape when the airbag is deployed.
4. The vehicle airbag device according to any one of claims 3 to 3. 5. A casing member (30) for accommodating an airbag (60), and hinged to a rear wall (37) of the casing member at a rear edge (41) so as to be openable and closable, and a gas is supplied from an inflator (50). A cover member (40) that opens so as to deploy the airbag when the airbag is supplied, and holding means (45, 36) that holds a closed state of the cover member with respect to the casing member. The holding means comprises: a front wall (3) of one of the casing member and the cover member;
5, 44) extending toward the other front wall of the casing member and the cover member and having a front wall-side engaged tongue (45) having an engagement hole (45a); and the casing member and the cover. A front wall-side engaging tongue protruding from the outer surface of the other front wall in a direction crossing the outer front surface of the member so that the front wall-side engaging tongue cannot escape when the airbag is deployed. And a front wall-side engaging projection (36) that engages in the engaging hole of the front wall.
A fragile portion (45b, 45b having a strength such that the front wall-side engaging projection is broken without being cut from the other front wall of the casing member and the cover member when the airbag is deployed.
45d) for a vehicle airbag device comprising: 6. A casing member (30) for accommodating an airbag (60), hinged to a rear wall (37) of the casing member at a rear edge (41) so as to be openable and closable, and a gas from an inflator (50). The airbag device for a vehicle, comprising: a cover member (40) that opens so as to deploy the airbag when the airbag is supplied; and holding means (34, 43) that holds the cover member in a closed state with respect to the casing member. And the holding means comprises one of both side walls (3) of the casing member and the cover member.
3, 42) to the other side walls of the casing member and the cover member, respectively, to engage with the engagement holes (43, 43).
a) and each side wall engaging tongue (43) having a) and each side wall side engaging projection protruding from the outer surface of the other side wall of the casing member and the cover member in a direction crossing the outer surface. And each side wall-side engaging projection (34) that engages in the engaging hole of each side wall-side engaged tongue to such an extent that it cannot escape when the airbag is deployed. The side engaged tongue portion is broken at the outer peripheral portion of the engagement hole portion without cutting the side wall side engaging projections from the other two side walls of the casing member and the cover member when the airbag is deployed. A casing for an airbag device for a vehicle, comprising a weak portion (43b, 43d) having a sufficient strength. 7. The holding means further includes one side wall (3) of the casing member and the cover member.
3, 42) to the other side walls of the casing member and the cover member, respectively, to engage with the engagement holes (43, 43).
a) and the other side wall (3) of the casing member and the cover member.
3) each side wall side engaging projection protruding from the outer surface thereof in a direction crossing the outer side surface and engaging the side wall side engaged tongue portions to such an extent that it cannot escape when the airbag is deployed. And a side wall-side engaging projection (34) that engages in the hole. Each of the side wall-engaged tongues is broken at the outer periphery of the engaging hole when the airbag is deployed. 6. The vehicle according to claim 5, further comprising weak portions (43b, 43d) having a strength that is greater than a strength of the weak portion of each of the front-wall-side engaged tongue portions. Casing for airbag device. 8. The casing is made of an elastic synthetic resin material, and each of the engaging projections is inserted into an engaging hole of each of the corresponding engaged tongues against its elasticity, and A head (34a, 36a) which engages with said engagement hole to such an extent that it cannot escape when the airbag is deployed.
A casing for the vehicle airbag device according to any one of claims 1 to 7.