JPH08175306A - Air bag device - Google Patents

Abstract

PURPOSE: To protect the attachment part of a film-shaped switch provided for an air bag device. CONSTITUTION: A film-shaped switch 33 is incorporated into an air bag device 14 installed in the boss part of a steering wheel. In the film-shaped switch 33, a switch part 56, whose contact closes at transformation, and a foot piece 57, which is extended from this switch 56, are made. A lock pin is provided at the rear of the cover body 33, and the switch part 56 is attached to the rear side of the cover body 33 engaging this lock pin in the slide groove 71 made at the switch part 56. The tip of the foot piece 57 is fixed to a base plate 21. When the air bag expands, the cover body 34 tears and opens along the tear line by the pressure of this expansion, and unfolds together with the film-shaped switch 33 to form the projection port of the air bag 25. Accordingly, when the cover body 34 unfolds, the film-shaped switch 33 slides to lighten the stress added to the film-shaped switch 33.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airbag device having a switch and a cover body covering the airbag.

[0002]

2. Description of the Related Art Conventionally, for example, a steering wheel described in Japanese Utility Model Laid-Open No. 4-28170 is known. An airbag device including an inflator that injects gas and an airbag that inflates and deploys with the gas is attached to the boss portion of the steering wheel. Further, the airbag device is provided with a base plate for mounting the airbag and the inflator, and a cover body for covering the folded airbag is mounted on the base plate. Further, in this airbag device, a film-shaped switch is attached along the back surface side of the cover body, and the end portion of this switch is led out to the lower side of the airbag device to provide a horn device provided on the vehicle body side. It is designed to be connected to. Also, with this airbag device,
A backing plate is provided between the switch and the airbag to prevent uneven load from being applied to the switch from the airbag.

In this airbag device, the film-shaped switch is closed by pushing the cover body, and the horn device provided on the vehicle body side is operated.

Further, in the event of a collision of an automobile or the like, gas is injected from an inflator to inflate the airbag, and the pressure of this inflation causes the cover body to be split and the cover body to be curved in a double-opening manner to project the airbag. A mouth is formed, and the airbag is projected through this projection opening so as to be inflated and deployed to the front side of the occupant.

[0005]

However, in the above-mentioned conventional configuration, when the airbag is inflated and the cover body is curved in a double door shape, the film-shaped switch is curved together with the cover body. At this time, since the switch is curved along the outer peripheral surface where the cover body is curved, a force in the extending direction is applied to the portion where the film switch is fixed to the cover body or the base plate. Therefore, in order to prevent the switch from being damaged in this state, it is necessary to increase the strength of the fixed part of the switch, and by increasing the strength of the fixed part of the switch, the deployment operation of the airbag can be hindered. In order to avoid the problem, it is necessary to have a complicated structure, and there is a problem that the manufacturing cost of the airbag device increases.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an airbag device which is equipped with a switch and which can smoothly perform an expanding operation of the airbag.

[0007]

An airbag apparatus according to claim 1 is an airbag which is inflated by gas inflow, and a cover which is provided with a door piece portion which covers the airbag and expands when the airbag is inflated. A switch part that is attached along the door piece part of the cover and is closed at the time of deformation, and a film-like switch that is provided with a leg piece part that extends from the switch part and is fixed to a mounted member, The switch portion of the membrane switch is provided with a switch attachment portion slidably attached to the door piece portion.

According to another aspect of the present invention, there is provided an air bag device, which is inflated by the inflow of gas, a cover which covers the air bag and which is provided when the air bag is inflated, and a door piece of the cover. A switch that is attached along the section and that is closed when deformed, and a membrane switch that is provided with a leg piece that extends from the switch section and is fixed to a mounted member. The portion is provided with a switch attachment portion detachably attached to the door piece portion.

According to a third aspect of the present invention, an airbag device is inflated by gas inflow, a cover provided with a door piece portion which covers the airbag and is deployed when the airbag is inflated, and a door piece of the cover. A switch that is attached along the section and that is closed when deformed, and a membrane switch that is provided with a leg piece that extends from the switch section and is fixed to a mounted member. The section is provided with an elastically deformable switch attachment section that is attached to the door piece section.

According to a fourth aspect of the present invention, in the airbag apparatus according to any of the first to third aspects, the switch attachment portion of the membrane switch is attached by engaging with a door piece portion.

According to a fifth aspect of the present invention, in the airbag apparatus according to any one of the first to fourth aspects, the cover has an elastically deformable cover body, and the switch portion of the membrane switch is the cover body. It is attached along the back side of the door piece provided on the.

According to a sixth aspect of the present invention, in the airbag apparatus according to any of the first to fourth aspects, the cover includes an inner body and an elastically deformable cover body that covers a surface side of the inner body. The switch portion of the membrane switch is attached along the front surface side of the door piece portion provided on the inner body.

[0013]

In the airbag device according to the first aspect of the present invention, by pushing the cover, the switch portion of the membrane switch attached along the cover is deformed and the membrane switch is closed. When the airbag is inflated, the switch portion of the membrane switch is deployed together with the door piece of the cover. At this time, when a force greater than a predetermined value is applied to the switch portion of the membrane switch whose leg pieces are fixed to the member to be attached due to the bending of the door piece, the switch attaching section slides with respect to the door piece,
It reduces the force applied to the membrane switch.

In the airbag device according to the second aspect, by pushing the cover, the switch portion of the membrane switch attached along the cover is deformed, and the membrane switch is closed. When the airbag is inflated, the switch portion of the membrane switch is deployed together with the door piece of the cover.
At this time, when a force greater than a predetermined value is applied to the switch portion of the membrane switch whose leg pieces are fixed to the member to be attached due to the bending of the door piece, the switch attachment part is separated from the door piece, and the film is removed. The force applied to the switch is reduced.

In the airbag device according to the third aspect, by pushing the cover, the switch portion of the membrane switch attached along the cover is deformed and the membrane switch is closed. When the airbag is inflated, the switch portion of the membrane switch is deployed together with the door piece of the cover.
At this time, if a force greater than a predetermined amount is applied to the switch portion of the membrane switch whose leg pieces are fixed to the mounted member due to the bending of the door piece, the switch mounting portion is elastically deformed, and the film Reduces the force applied to the switch.

In the airbag device according to claim 4, in addition to the operation according to any one of claims 1 to 3, since the switch mounting portion of the membrane switch is mounted by being engaged with the door piece portion, the airbag device. Will be easier to assemble.

In the airbag device according to the fifth aspect, in addition to the operation according to any one of the first to fourth aspects, by pushing the elastically deformable cover body, the switch portion of the membrane switch is formed together with the cover body. It is deformed and the membrane switch is closed.

In the airbag device according to the sixth aspect, in addition to the operation according to any one of the first to fourth aspects, the elastically deformable cover body is pushed to support the inner body via the cover body. The switch portion of the formed film switch is pushed, and the film switch is closed.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of an embodiment of the airbag device of the present invention will be described below with reference to the drawings.

In FIG. 2, reference numeral 11 denotes an automobile steering wheel. The steering wheel 11 includes a steering wheel main body 12 and the steering wheel main body.
It is composed of an airbag device 14 mounted on the upper side of the occupant 12, and the like.

The steering wheel body 12 is
The rim portion 15 has an annular shape, a boss portion 16 located inside the rim portion 15, and a plurality of spoke portions 17 connecting the rim portion 15 and the boss portion 16. Further, as shown in FIG. 4 and the like, a metal-made substantially cylindrical boss A which is fitted to a steering shaft (not shown) is arranged on the lower side of the steering wheel body 12 which is the vehicle body side. A boss plate B made of a metal plate or the like is fixed to the boss A by welding or the like. Further, the core metal of the spoke portion 17 is connected to the boss plate B, and the core metal of the rim portion 15 is connected to the core metal of the spoke portion 17. A skin 18 made of a soft synthetic resin or the like is formed on the outer periphery of the core of the rim portion 15 and the outer periphery of the spoke 17 on the side of the rim 15 of the core. Further, the lower side portion of the boss portion 16 is covered with a lower cover C made of resin.

Further, as shown in FIGS. 1 and 4, the airbag device 14 is provided with a metal base plate 21 as a member to be attached, and the base plate 21 attaches a bracket or the like to the boss plate B of the steering wheel body 12. It is designed to be attached via. The base plate 21 includes an upper plate portion 22 having a substantially rectangular shape in a plane,
A peripheral wall portion 23 extending downward from a peripheral portion of the upper plate portion 22 is formed. A circular hole-shaped inflator mounting hole 22a is formed in the upper plate portion 22, and an inflator 24 that injects gas by fitting into the inflator mounting hole 22a is mounted. A bag-shaped airbag 25 is attached in a folded state so as to cover the upper side of 24. And
The airbag 25 has an annular retainer 26, the vicinity of the opening 25a is pressed against the upper surface of the base plate 21, and a bolt protruding downward from the retainer 26.
The air bag 25 is fixed to the base plate 21 together with the inflator 24 by inserting the air bag 25, the base plate 21, and the flange portion 24a of the inflator 24 through the nut 27 and screwing the nut 28 from the lower surface of the flange portion 24a. ing.

Further, the folded airbag 25 is covered on the surface side by a wrapping member 31 made of paper or polyester film, and the base plate 21 covers the airbag 25, and a horn switch is provided. A cover body 34, which constitutes a cover to which a pair of front and rear film switches 33 constituting the above is attached, is attached.

As shown in FIGS. 1 to 3, the cover body 34 is integrally formed of synthetic resin, for example, thermoplastic elastomer, and the steering wheel body 12
An upper plate portion 36 that covers a part of the boss portion 16 and the spoke portion 17 of
And a mounting wall portion 37 having a substantially rectangular tube shape and protruding downward from the back surface of the upper plate portion 36. Also, this mounting wall
A plurality of engaging protrusions 37a are provided on the inner side of the protrusion 37, and a square-shaped rivet through hole 37b is formed. The cover body 34 has the mounting wall portion 37 fitted to the outer side of the peripheral wall portion 23 of the base plate 21, the engaging projections 37a engaged with the engaging holes 23a formed in the peripheral wall portion 23, and the peripheral wall portion. The mounting wall portion 37 is fixed to the peripheral wall portion 23 and fixed to the base plate 21 by a rivet 38 that inserts a through hole 23b formed in the portion 23 and a rivet through hole 37b communicating with the through hole 23b.

Further, the surface side of the upper plate portion 36 of the cover body 34 is formed by combining complicated curved surfaces (third curved surfaces) curved in the front-rear direction and both side directions in order to improve the appearance design. ing. Furthermore, on the surface side of the upper plate portion 36,
The operating portion 41 of the horn switch is formed so as to be elastically deformable in the vertical direction, and an annular groove 42 indicating the operating range is formed around the operating portion 41, and the operating portion 41 is divided into front and rear. A central concave groove 43 is formed.

Further, a tear line 44, which is weaker than other portions of the upper plate 36, is formed in a concave shape in a substantially H-shaped plane on the rear surface side of the upper plate 36 of the cover 34. Along with the upper plate portion 36 of the cover body 34 torn apart, a pair of front and rear door pieces 46, 46 that are deployed forward and backward when the airbag 25 is inflated.
Are formed. A fragile tear line 31a is also formed on the wrapping member 31 that covers the airbag 25, with both sides as the longitudinal direction.

Then, as shown in FIG. 3, a pair of front and rear pressing portions 51, 51 are formed on the upper plate portion 36 of the cover body 34 on the rear surface side of the operating portion 41. And this pressing part
Reference numeral 51 denotes a projection 52 as a large number of abutting portions which are formed in a planar rectangular shape and are provided on the back surface side, and a virtual surface connecting the front end side surfaces of these projections 52 is longitudinally cut along the longitudinal direction. The surface has a straight line shape, and the vertical cross section along both sides has a bilaterally symmetrical arcuate shape, and is formed into a substantially cylindrical surface shape that bulges toward the surface side as a whole.

Flat protrusions 53 are formed in the vicinity of the outer peripheral portion of the door piece 46, and locking pins 54 project from the protrusions 53 toward the rear surface side. A head 54a having a large diameter is integrally formed at the tip of each locking pin 54.

On the other hand, each of the membrane switches 33 is also called a thin film (membrane) switch or the like, and has an elastically deformable membrane shape (film shape) and a switch portion 56 having a substantially rectangular plane shape. The leg portion 57 extending from the switch portion 56 and the leg portion 57 are formed in a substantially T shape in a plane. And
The switch part 56 includes a pair of copper foil contacts that are vertically opposed to each other, and these contacts are respectively supported by a support carrier made of polyester film, and these contacts are arranged at a predetermined interval. It is held in a state of being separated by a predetermined dimension by a plurality of spacers.

Further, the switch portion 56 of each film switch 33
A plurality of slide grooves 71 as switch mounting portions are formed at predetermined intervals along the vicinity of the outer peripheral portion. Further, each slide groove 71 has a slit shape whose longitudinal direction is the front-back direction, that is, the extending direction of the leg piece portion 57, and the substantially central portion of this longitudinal direction is engaged with a substantially circular hole shape having a large diameter dimension. Hole 71a
Are formed. The diameter of the engaging hole 71a and the width of the slide groove 71 are the same as those of the locking pin 54 of the cover body 34.
It is formed to be smaller than the width dimension of the head portion 54a.

In the film switch 33, the locking pin 54 of the cover body 34 is inserted into each slide groove 71, the shaft portion of the locking pin 54 is engaged with the engaging hole portion 71a, and The lower surface of the switch portion 56 is engaged and held by the head portion 54a of the stop pin 54, so that the cover portion 34 is attached in parallel with the pressing portion 51 along the pressing portion 51 on the back surface side.

On the other hand, the leg piece portion 57 of each membrane switch 33 is formed integrally with the support carrier of the contact, and the mounting wall portion of the cover body 34.
It is bent downward along the inner surface of 37. A plurality of leg piece attachment holes 72 are formed at the ends of the leg piece portions 57, and these leg piece attachment holes 72 are used for the lapping member 31.
At the same time, it is locked by the engaging projection 37a protruding from the mounting wall portion 37 of the cover body 34, and is sandwiched and fixed between the peripheral wall portion 23 of the base plate 21 and the mounting wall portion 37 of the cover body 34. Has been done. Further, a terminal piece 74 electrically connected to either one of the upper and lower contacts is projected from the leg piece portion 57, and a lead wire 75 connected to a horn device (not shown) is connected to the terminal piece 74. It is connected. The other one of the upper and lower contacts is electrically connected to the boss A via the base plate 21, and electrically connected to the negative terminal of the battery via the steering shaft fitted to the boss A. Has been done.

In the horn switch constructed as described above, when the operating portion 41 of the upper plate portion 36 of the cover body 34 is pressed, the operating portion 41 is bent downward and elastically deformed. Then, by the pressing portion 51 protruding on the back surface side of the operation portion 41,
Each of the film switches 33 is pressed and bent downward, and the vertically opposed contacts are brought into contact with each other, so that the film switch 33 is closed and the horn is blown.

In addition, when a vehicle collides, a signal from a collision diagnosis unit (not shown) is used to output an inflator.
When the igniter of 24 is activated and the filled propellant is burned, nitrogen gas or the like is rapidly injected into the inside of the airbag 25 from the gas injection holes 24b formed on the peripheral surface, and the folded airbag is folded. 25 expands rapidly. Then, due to the inflation pressure of the airbag 25, the wrapping member 31 is split along the tear line 31a, and the cover body 34 is
The upper plate portion 36 is split along the tear line 44 to form a pair of front and rear door pieces 46, 46. From this state, when the airbag 25 is further inflated, each door piece is curved and expands back and forth at a high speed in a double-door manner to form a protruding opening of the airbag 25, and from this protruding opening, the front side on the occupant side is formed. Airbag 25
Is designed to expand and deploy.

At this time, the switch portions 56 of the front and rear film switches 33 are curved while rotating back and forth together with the door pieces 46, 46 of the cover body 34, respectively. In this state, the switch
56 is fixed to the door piece portion 46, and the tip end portion of the leg piece portion 57 extending from the switch portion 56 is fixed to the base plate 21, so that the film switch 33 extends in the extending direction of the leg piece portion 57. A force is applied along the stretched direction. In particular, the cover body 34
Because of the difference between the radius of curvature of the door piece portion 46 and the radius of curvature of the film switch 33, when the door piece portion 46 is fully opened, the slide groove 71 formed on the film switch 33 and the cover body 34 that are engaged with each other are formed. A large tensile stress is applied to the locking pin 54. Then, in this state, the vicinity of the slide groove 71 of the switch portion 56 of the film switch 33 is deformed, the shaft portion of the locking pin 54 is disengaged from the engaging hole portion 71a and slides in the slide groove 71, and A force applied to the switch 33 or the locking pin 54 of the cover body 34 is smoothly alleviated and absorbed.

As described above, according to the steering wheel 11 of this embodiment, the door piece portion of the cover body 34 and the base plate are
Since the slide groove 71 is formed in the switch portion 56 of the film switch 33 attached to each of 21 and 21, and the locking pin 54 protruding from the cover body 34 is engaged with the slide groove 71, the airbag device 14 is When a force greater than a predetermined value is applied to the membrane switch 33 when the door pieces 46, 46 of the cover body 34 are deployed by being actuated, the membrane switch 33 is slid with respect to the door pieces 46, 46 to cause the membrane switch 33 to slide. The force applied to the switch 33 or the cover 34 can be smoothly relaxed and absorbed. Therefore, it is not necessary to improve the strength of the membrane switch 33 and the strength of the locking pin 54, and the membrane switch 33 can be reliably held with a simple structure, so that the manufacturing cost of the airbag device 14 can be reduced. In addition, the membrane switch 33 does not give a resistance to the deployment operation of the door pieces 46, 46, and the airbag 25 can be smoothly inflated and deployed.

When the film-shaped switch 33 is fixed to the cover body 34 so as not to move, the size of the film-shaped switch 33 may change due to the difference in the coefficient of linear expansion of each member depending on the temperature conditions. A local stress is generated in the portion 56, the contacts are closed without pushing the cover body 34, or the cover body 34 is closed.
Although there is a possibility that the stroke of pushing 34 changes locally, in this embodiment, cover the membrane switch 33 with the cover body.
Since it is attached so as to be movable in the surface direction with respect to 34, it is possible to absorb the dimensional change due to heat or the like and stabilize the operation of the membrane switch 33.

Then, the switch portion 56 of the membrane switch 33.
Can be attached to the back surface of the cover body 34 by inserting and engaging the slide groove 71 with the locking pin 54, so that it can be easily manufactured and the manufacturing cost can be reduced.

Further, since the film-shaped switch 33 can be made of a material such as a polyester film which does not easily stretch, the degree of freedom in material selection can be increased.

The shape of the cover body 34 is not limited to the above-mentioned embodiment, and is, for example, as shown in FIGS.
Like the airbag device 81 shown in FIG. 2, a cover body 82 having a flat upper plate portion 36 may be used. Further, in this airbag device 81, the wrapping member 31 is not used.

In each of the above embodiments, the cover member 34,
The locking pin 54 is provided on the back side of 82, and the slide groove 71 that engages with the locking pin 54 is formed in the film switch 33. For example, in the cover body 84 shown in FIG. 7 and FIG. As described above, the slide holding portions 85 having a substantially U-shaped cross section can be formed to face each other along both side portions of the door piece portions 46, 46. Further, in this configuration, the film-shaped switch 33 is provided in the opening 86 formed to face each slide holding portion 85.
The edges on both sides of the switch portion 56 can be inserted and engaged and held. Then, the airbag 25 is inflated and the door piece 4
At the time of unfolding 6, 46, the film switch 33 moves with respect to the door piece portion 46 while the slide holding portion 85 of the door piece portions 46, 46 and the edge portion of the film switch 33 are in sliding contact with each other. Then, the stress applied to the film switch 33 is relaxed and absorbed, and the film switch 33
Can be protected.

Further, as shown in FIG. 9 to FIG. 11, for example, a cover body 82 having a locking pin 54 having a head portion 54a having a large diameter is provided on the back side so as to project, and a film switch 33 is provided. It is also possible to form a dismounting mounting portion 87 as a switch mounting portion that removably engages with the locking pin 54. Then, the dismounting mounting portion 87 has a locking pin 54
The engaging hole portion 88 with which the shaft portion of the engaging portion engages, and the groove portions 89, 89 extending continuously in two directions from the engaging hole portion 88 are formed, and the portion surrounded by these groove portions 89, 89. However, it is a deformation piece 90. When such a mounting portion 87 for detachment is used, the airbag device 14 is operated to operate the door piece portion of the cover body 84.
When a force greater than a predetermined value is applied to the film switch 33 when the films 46 and 46 are deployed, the deformation piece 90 formed on the detachment mounting portion 87 of the film switch 33 is easily deformed, and the locking pin is formed. 54 can be easily detached from the detaching attachment portion 87. Therefore, it is possible to prevent a large force from being applied to the film switch 33 or the locking pin 54, and to prevent the film switch 33 and the cover body from being applied.
84 can be protected, and the door pieces 46, 46 can be smoothly deployed.

In the embodiment shown in FIG. 1 etc.,
The locking pin 54 is detached from the slide groove 71, and the film switch
The switch portion 56 of 33 can be detached from the cover body 84.

In the embodiment shown in FIG. 10 and the like, the groove 89 is extended in two directions from the engaging hole 88 with which the shaft of the locking pin 54 is engaged. like,
Cut lines 92 are radially formed in a plurality of directions such as four directions from an engagement hole portion 91 with which the shaft portion of the locking pin 54 engages, and a dismounting attachment portion 93 capable of engaging and disengaging the locking pin 54 is provided. It can also be formed.

Further, for example, as shown in FIG. 13, an insertion hole portion 95 through which the head portion 54a of the engagement pin 54 can be inserted, and an engagement groove portion 96 extended from the insertion hole portion 95. Therefore, the pin locking portion 97 as the switch mounting portion can be formed. The width dimension of the locking groove portion 96 of the pin locking portion 97 is smaller than the diameter dimension of the insertion hole portion 95. Therefore, by sliding the membrane switch 33 with the head portion 54a of the locking pin 54 inserted from the insertion hole portion 95, the head portion 54a of the locking pin 54 is moved to the peripheral edge portion of the locking groove portion 96. The membrane switch 33 is attached to the cover body 84, and the peripheral portion of the locking groove portion 96 is deformed while the force is applied to the membrane switch 33. The switch portion 56 can be easily detached from the cover body 84.

Further, for example, as shown in FIG. 14 or FIG. 15, groove-shaped pin locking portions 98 and 99 communicating with the outer edge of the film switch 33 are formed, and the shaft portion of the locking pin 54 is fixed. It is also possible to insert the pin 54 from the outer edge of the film switch 33 into the pin engaging portions 98 and 99 and engage the head portion 54a of the engaging pin 54 with the peripheral portions of the pin engaging portions 98 and 99.

Further, in each of the above embodiments, the head having a large diameter is used.
Although the locking pin 54 in which 54a is formed in advance is used, for example, after the locking pin 54 having a substantially cylindrical shape is inserted into the slide groove 71 as the switch mounting portion and the membrane switch 33 is arranged at a predetermined position, Heat the caulking end of this locking pin 54,
Alternatively, the membrane switch 33 can be held by forming the head portion 54a having a large diameter by using a so-called push nut or a push-on fix which attaches a stopper of another member to the tip of the locking pin 54.

In the structure in which the large-diameter head portion 54a is formed after the film-shaped switch 33 is arranged in this way, for example, as shown in FIG. 16, the shaft portion of the locking pin 54 is inserted through the head portion. A through hole 101 having a diameter smaller than that of 54a is formed, and an annular break line 102 having a diameter larger than that of the head 54a of the locking pin 54 is formed so as to surround the through hole 101 to mount the switch. It is also possible to form the breaking attachment part 103 as a part. In addition, in the structure in which the breaking attachment portion 103 is formed, the membrane switch 33 can be securely held at a predetermined position, and the breaking line 102 tears when a force larger than a predetermined force is applied to the membrane switch 33. However, the switch portion 56 of the membrane switch 33 can be easily separated from the cover body 84.

Further, for example, the shape of the breaking line 102 is not limited to the annular shape, and for example, as shown in FIG. 17, a breaking line 105 communicating with the outer edge portion of the membranous switch 33 is formed to break the breaking line 102. The mounting portion 103 can be formed.

Further, as shown in, for example, FIGS. 18 and 19, an annular groove portion 111 is formed around the through hole 110 through which the shaft portion of the locking pin 54 is inserted, and the groove portion 111 is bridged. It is also possible to form a plurality of connecting portions 112 such as four to form the deformable mounting portion 114 as a switch mounting portion. Then, the through hole of the deformation mounting portion 114
With the shaft portion of the locking pin 54 inserted through the 110, and the head portion 54a having a large diameter is formed at the tip of the locking pin 54, the membrane switch 33 can be securely held at a predetermined position. When a force greater than a predetermined amount is applied to the membrane switch 33, the connecting portion 112 of the deformation mounting portion 114 is elastically deformed, and the force applied to the membrane switch 33 or the locking pin 54 is absorbed and alleviated. be able to. Further, in the configuration in which the deformation mounting portion 114 is formed, when a large force is applied to the membrane switch 33, the connection portion 112 is broken and the switch portion 56 of the membrane switch 33 is easily separated from the cover body 84. You can also let it.

In each of the above embodiments, the cover body
Membrane switch between 34 and 82 and folded airbag 25
Although 33 is arranged, for example, as shown in FIG. 20, an inner body 120 having a substantially box shape with an opened lower surface is arranged between the cover body 34 and the folded airbag 25. The switch portion 56 of the film switch 33 can be arranged between the cover body 34 and the cover body 34. Also, this inner body 12
0 is similar to the cover body 34 in that the peripheral wall portion 122 is fixed to the base plate 21 and the fragile tear line 123 is recessed on the upper surface. It is a pair of front and rear door pieces 125, 125 that extend forward and backward. Further, a plurality of caulking pins 127 for heat caulking are provided in a protruding manner on the periphery of the door pieces 125, 125 of the inner body 120.

Then, using such an inner body 120, the caulking pin 12 protruding from the upper surface of the inner body 120 is used.
When the switch part 56 of the membrane switch 33 is fixed by using 7, the strong force in the contraction direction is applied to the membrane switch 33 when the door pieces 125 of the inner body 120 are expanded. In addition, the film switch 33 absorbs or relaxes the force applied to the caulking pin 127 or the like by sliding or detaching from the door pieces 125 or 125, so that the caulking pin 127 or the film switch 33 or the like can be removed. In addition to the protection, the door pieces 125 of the inner body 120 can be smoothly deployed and the airbag 14 can be inflated and deployed smoothly.

[0053]

According to the airbag device of the first aspect, when the airbag is inflated and the switch portion of the film switch is deployed together with the door piece of the cover, the leg piece is bent due to the bending of the door piece. When a force greater than a predetermined amount is applied to the switch part of the membrane switch whose part is fixed to the mounted member, the switch mounting part slides against the door piece, relaxing the force applied to the film switch, and The switch can be protected.

According to the airbag device of claim 2,
When the airbag expands and the switch part of the membrane switch expands together with the door part of the cover, the leg part is fixed to the switch part of the film switch with the leg part fixed to the attached member due to the bending of the door part. When the above force is applied, the switch mounting portion is detached from the door piece portion, and the force applied to the membrane switch can be alleviated to protect the membrane switch.

According to the airbag device of the third aspect,
When the airbag expands and the switch part of the membrane switch expands together with the door part of the cover, the leg part is fixed to the switch part of the film switch with the leg part fixed to the attached member due to the bending of the door part. When the above force is applied, the switch mounting portion is elastically deformed, and the force applied to the membrane switch can be relaxed to protect the membrane switch.

According to the airbag device of claim 4,
In addition to the effect according to any one of claims 1 to 3, since the switch mounting portion of the membrane switch is mounted by being engaged with the door piece portion, manufacturing of the airbag device can be facilitated and manufacturing cost can be reduced. it can.

According to the airbag device of claim 5,
In addition to the effect according to any one of claims 1 to 4, by pushing the elastically deformable cover body, the switch portion of the membrane switch can be deformed together with the cover body to close the membrane switch. it can.

According to the airbag device of claim 6,
In addition to the effect according to any one of claims 1 to 4, by pushing the elastically deformable cover body, the switch portion of the membrane switch supported by the inner body is pushed through the cover body, The membrane switch can be closed.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an airbag device of the present invention.

FIG. 2 is a plan view of a steering wheel including the same airbag device.

FIG. 3 is a perspective view of the same cover body and the membrane switch in an exploded state.

FIG. 4 is a cross-sectional view showing another embodiment of the airbag device of the present invention.

FIG. 5 is a plan view of a steering wheel provided with the same airbag device.

FIG. 6 is an exploded perspective view of the same airbag device.

FIG. 7 is a perspective view of a cover body showing still another embodiment of the airbag device of the present invention.

FIG. 8 is a sectional view of the same cover body.

FIG. 9 is an exploded perspective view showing still another embodiment of the airbag device of the present invention.

FIG. 10 is a perspective view of a switch mounting portion showing another embodiment of the airbag device of the present invention.

FIG. 11 is a partial cross-sectional view of the above airbag device.

FIG. 12 is a plan view of a switch mounting portion showing still another embodiment of the airbag device of the present invention.

FIG. 13 is a plan view of a switch mounting portion showing still another embodiment of the airbag device of the present invention.

FIG. 14 is a plan view of a switch mounting portion showing still another embodiment of the airbag device of the present invention.

FIG. 15 is a plan view of a switch mounting portion showing still another embodiment of the airbag device of the present invention.

FIG. 16 is a plan view of a switch mounting portion showing still another embodiment of the airbag device of the present invention.

FIG. 17 is a plan view of a switch mounting portion showing still another embodiment of the airbag device of the present invention.

FIG. 18 is a plan view of a switch mounting portion showing still another embodiment of the airbag device of the present invention.

FIG. 19 is a cross-sectional view of a part of the above airbag device.

FIG. 20 is a perspective view of an airbag device according to still another embodiment of the present invention in an exploded state.

[Explanation of symbols]

 14 Airbag device 21 Base plate as a member to be mounted 25 Airbag 33 Membrane switch 34, 82, 84 Cover body 46 Door piece part 56 Switch part 57 Leg piece part 71 Slide groove as a switch mounting part 87 As a switch mounting part Detaching mounting part 97 Pin locking part as a switch mounting part 103 Breaking mounting part as a switch mounting part 114 Deformation mounting part as a switch mounting part 120 Inner body

Claims (6)

[Claims] 1. An airbag that is inflated by the inflow of gas, a cover that is provided with a door piece portion that covers the airbag and that expands when the airbag is inflated, and is attached along the door piece portion of the cover when deformed. A switch part to be closed, and a film-like switch provided with a leg piece part extending from the switch part and fixed to a member to be attached, wherein the switch part of the film-like switch has the door piece part. An airbag device comprising a switch mounting portion slidably mounted on the air bag device. 2. An airbag which is inflated by the inflow of gas, a cover provided with a door piece portion which covers the airbag and expands when the airbag is inflated, and a cover which is attached along the door piece portion of the cover when deformed. A switch part to be closed, and a film-like switch provided with a leg piece part extending from the switch part and fixed to a member to be attached, wherein the switch part of the film-like switch has the door piece part. An air bag device, wherein a switch mounting portion that is detachably mounted on the air bag device is provided. 3. An air bag that is inflated by the inflow of gas, a cover that is provided with a door piece portion that covers the air bag and that expands when the air bag is inflated, and is attached along the door piece portion of the cover when deformed. A switch part to be closed, and a film-like switch provided with a leg piece part extending from the switch part and fixed to a member to be attached, wherein the switch part of the film-like switch has the door piece part. And an elastically deformable switch mounting portion provided on the air bag device. 4. The switch mounting portion of the membrane switch is mounted by engaging with a door piece.
The airbag device according to any one of 1 to 3. 5. The cover includes an elastically deformable cover body, and the switch portion of the membrane switch is attached along a back surface side of a door piece portion provided on the cover body. The airbag device according to any one of 1 to 4. 6. The cover comprises an inner body and an elastically deformable cover body that covers the surface side of the inner body.
The airbag device according to any one of claims 1 to 4, wherein the switch portion of the membrane switch is attached along a front surface side of a door piece portion provided on the inner body.