JPH08216819A - Air bag device - Google Patents

Abstract

PURPOSE: To smoothen expansion work of an air bag device furnished with a film switch. CONSTITUTION: A film switch 33 is built in an air bag device 14 to be installed on a boss part of a steering wheel. A switch part 56 a contact point of which is closed at the time of deformation and a leg piece part 57 extended from this switch part 56 are formed on the film switch 33. A head end part of the leg piece part 57 is fixed on a base plate 21. The switch part 56 is fixed to the back side of a cover body 34 which covers a folded air bag 25. An opening part 76 is formed on an intermediate part of the leg piece part 57, and an extensive extension part 75 is formed. When the air bag 25 is expanded, the cover body 34 is cleaved along a tear line by this expansion pressure, extended with the film switch 33 and forms a projected port of the air bag 25. Consequently, at the time when the cover body 34 is extended, the extension part 75 is extended and mitigates stress applied on the film 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 this switch will be curved along the outer peripheral surface where the cover body is curved, since a force in the extending direction is applied to the portion where this film-shaped switch is fixed to the cover body or the base plate,
In order to prevent the switch from being damaged, it is necessary to increase the strength of the fixed portion of the switch, which causes a problem of increasing the manufacturing cost of the airbag device.

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 device according to claim 1 is provided with an elastic member which is provided with an airbag which is inflated by the inflow of gas, and a door piece portion which covers the airbag and is deployed when the airbag is inflated. A possible cover body, a switch portion attached along the back side of the door piece portion of the cover body and closed at the time of deformation, and a leg piece attachment portion extending from the switch portion and fixed to a member to be attached. A film-shaped switch provided with the formed leg piece portion, wherein the leg piece portion of the film-shaped switch is provided with an extension portion capable of extension and deformation on the switch portion side of the leg piece attachment portion. .

According to a second aspect of the present invention, in the airbag device according to the first aspect, the extension portion is formed by forming an opening in the leg piece portion.

According to a third aspect of the present invention, in the airbag device according to the first aspect, the extension portion is formed by forming a bent portion formed by bending a leg piece portion.

According to a fourth aspect of the present invention, in the airbag apparatus according to the first aspect, the extending portion is formed by forming a folded-back portion formed by folding back the leg pieces along the longitudinal direction. is there.

According to a fifth aspect of the present invention, there is provided an air bag apparatus, wherein the air bag is inflated by the inflow of gas, the inner body is provided with a door piece portion which covers the air bag and is deployed when the air bag is inflated, and the inner body. An elastically deformable cover body for covering, a switch portion that is located between the inner body and the cover body, is attached to the front surface side of the door piece portion of the inner body, and is closed when pressed, and the switch portion that extends from this switch portion. A membrane switch provided with a leg piece portion provided with a leg piece attachment portion fixed to a member to be attached, wherein the attachment portion of the membrane switch is provided with a deformable portion capable of being contracted and deformed. It is a thing.

[0012]

In the air bag device according to the first aspect of the present invention, by pushing the elastically deformable cover body, the switch portion of the membrane switch is deformed together with the cover body, and the membrane switch is closed. When the airbag expands, the door piece of the cover body expands while curving, and when the membrane switch attached along the back side of the door piece of the cover body bends, the leg The extension portion formed on one side extends, and the extension force applied to the membrane switch is absorbed.

In the airbag device according to the second aspect, in addition to the function according to the first aspect, since the extension portion is formed by forming the opening portion in the leg piece portion, the manufacture of the membrane switch becomes easy.

In the airbag device according to a third aspect of the present invention, in addition to the function of the first aspect, the extension portion is formed by forming a bent portion formed by bending the leg piece portion. Manufacturing is easy.

In the airbag device according to the fourth aspect, in addition to the operation according to the first aspect, the extending portion is formed by forming a folded-back portion formed by folding back the leg pieces along the longitudinal direction. Is greatly expanded, and the force in the expansion direction applied to the membrane switch is smoothly absorbed.

In the airbag device according to the fifth aspect, by pushing the elastically deformable cover body, the membrane switch is pushed through the cover body, and the membrane switch is closed. When the airbag is inflated, the door piece of the inner body expands together with the switch portion of the membrane switch attached to the surface side of the door piece. At this time, the leg portion of the membrane switch is provided with the deformable portion capable of being contracted and deformed, so that the influence of the membrane switch on the deployment of the door piece portion of the inner body is reduced.

[0017]

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 a steering wheel of an automobile. The steering wheel 11 includes a steering wheel body 12 and the steering wheel 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, on the lower side of the steering wheel main body 12 that is the vehicle body side, a metal-made substantially cylindrical boss that is fitted to a steering shaft (not shown) is arranged, and this boss is made of a metal plate or the like. The boss plate is fixed by welding. Also, on this boss plate, the spoke part
The core metal of 17 is connected, and the core metal of the rim portion 15 is connected to the core metal of the spoke portion 17. And these rim parts 15
On the outer peripheral portion of the core metal and the outer peripheral portion of the spoke portion 17 on the rim portion 15 side of the core metal, a skin portion made of a soft synthetic resin,
18 are formed. Further, the lower side of the boss 16 is covered with a resin lower cover.

Further, as shown in FIGS. 1 and 3, the airbag device 14 is provided with a metal base plate 21 as a member to be attached, and this base plate 21 is attached to the boss plate of the steering wheel body 12 via a bracket or the like. It can be attached. The base plate 21 is provided with an upper plate portion 22 having a substantially rectangular shape in a plan view and a peripheral wall portion 23 extending downward from a peripheral edge portion of the upper plate portion 22. 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 that covers the upper side of 24
25 is attached in a folded state. Then, this airbag 25 uses the annular retainer 26 to open the opening portion.
The vicinity of 25a is pressed against the upper surface of the base plate 21, and the bolt 27 protruding downward from the retainer 26
Through the air bag 25, the base plate 21, and the flange portion 24a of the inflator 24.
The air bag 25 is fixed to the base plate 21 together with the inflator 24 by screwing the nut 28 from the lower surface of the 24a.

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

As shown in FIGS. 1 to 4, the cover body 34 is integrally formed of a synthetic resin, for example, a thermoplastic elastomer.
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. There is. Further, on the surface side of the upper plate portion 36, a horn switch operation portion 41 is formed so as to be elastically deformable in the vertical direction, and an annular groove 42 indicating the operation range is formed around the operation portion 41. At the same time, a central recessed groove 43 for partitioning the operation portion 41 into front and rear is formed.

Further, on the back surface side of the upper plate portion 36 of the cover body 34, a tear line 44, which is weaker than other portions of the upper plate portion 36, is provided in a concave shape in a substantially H-shaped plane, and A pair of front and rear door pieces are formed so as to expand and contract when expanded. A wrapping member that covers the airbag 25
The weak tear line 31a is also formed on the side 31 with both sides as the longitudinal direction.

Then, as shown in FIG. 4, 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. Note that, for example, this curved surface is set based on the vertical curve of one part of the curved surface at both the left and right ends of the cover body 34. In addition, a flat protrusion 53 is formed near the outer periphery of the door piece,
From these protrusions 53, caulking pins 54 for thermal caulking are provided so as to protrude toward the back surface side.

Each of the membrane switches 33, which is also called a membrane switch, has an elastically deformable membrane shape (film shape) and has a substantially rectangular planar shape.
56 and a leg piece portion 57 extending from the switch portion 56 constitute a substantially T-shape in a plane. The switch unit 56 includes a pair of copper foil contacts that face each other vertically.
Each of these contacts is supported by a support carrier made of polyester film, and these contacts are
A plurality of spacers arranged at a predetermined interval hold them in a state of being separated by a predetermined dimension.

Further, the switch portion 56 of each film switch 33
A plurality of mounting holes 71 are formed at a predetermined interval along the vicinity of the outer peripheral portion of the cover body.
By inserting the caulking pin 54 of 34 and caulking by heat,
The switch portion 56 of the film switch 33 is fixed in parallel along the pressing portion 51 on the back surface side of the cover body 34.

On the other hand, the leg piece portion 57 of each film-shaped switch 33 is integrally formed with the support carrier of the contact, and the mounting wall portion 37 of the cover body 34.
Is bent downward along the inner surface of the. A plurality of leg piece attachment holes 72 that form the leg piece attachment portions are formed at the ends of the leg piece portions 57, and these leg piece attachment holes 72 are formed.
However, together with the wrapping member 31, the mounting wall portion of the cover body 34
It is locked to an engaging protrusion 37 a protruding from 37, and is fixed by being sandwiched between the peripheral wall portion 23 of the base plate 21 and the mounting wall portion 37 of the cover body 34. Further, a terminal piece 74 electrically connected to one of the upper and lower contacts is projected from the leg piece portion 57, and a lead wire 75a connected to a horn device (not shown) is connected to the terminal piece 74. It is connected. The other of the upper and lower contacts is electrically connected to the boss via the base plate 21, and is electrically connected to the negative terminal of the battery via the steering shaft fitted to the boss. There is.

Further, an extension portion 75 which also serves as a deforming portion is integrally formed at an intermediate portion in the longitudinal direction of the leg piece portion 57. The extension portion 75 is formed to have a larger width dimension than the other portion of the leg piece portion 57, and an elliptic hole-shaped opening portion 76 whose longitudinal direction is the width direction is formed. It is configured to be deformable in the extension direction along the direction.

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 car 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. From this state, further airbag
When the air bag 25 inflates, each door piece bends and expands back and forth at a high speed in a double-door shape to form a projecting opening of the airbag 25. From this projecting opening, the air bag 25 inflates and deploys to the front side on the occupant side. It is like this.

At this time, the switch portions 56 of the front and rear film switches 33 are curved while rotating forward and backward together with the door piece portion of the cover body 34. In this state, this switch
The tip of the leg piece 57 extending from 56 is the base plate 21.
In particular, due to the difference between the radius of curvature of the door piece of the cover body 34 and the radius of curvature of the film switch 33, the leg piece 57
Although a large tensile stress is applied to the leg portions, the extension portion 75 formed on each leg piece portion 57 is deformed in the extension direction according to the tensile stress, and the mounting hole 71 of the switch portion 56 of the membrane switch 33 or the leg piece portion is formed. The force applied to the leg piece mounting hole 72 of the 57 is relaxed 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
In the film-shaped switch 33 fixed to each of 21 and 21, a leg portion 57 located between the fixing portion to the cover body 34 and the fixing portion to the base plate 21 is formed with an extension portion 75 which is deformable in the extension direction. Therefore, when the airbag device 14 operates and the door piece portion of the cover body 34 is deployed, the membrane switch 33 can be smoothly deformed by following the deployment operation of the door piece portion. Therefore, it is not necessary to improve the strength of the membrane switch 33 or the strength of the fixing portion, and the membrane switch 33 can be reliably held even if an inexpensive fixing method is selected, so that the manufacturing cost of the airbag device 14 is reduced. In addition, the membrane switch 33 does not give a resistance to the deployment operation of the door piece, and the airbag 25 can be smoothly inflated and deployed.

The extension portion 75 of the membrane switch 33 may have a simple structure in which the leg portion 57 is provided with the opening 76, and the manufacturing cost of the airbag device 14 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.

In the above embodiment, the extension portion 75 of the membrane switch 33 has one opening portion in the middle portion of the leg piece portion 57.
However, as shown in FIG. 5, for example, as shown in FIG.
Alternatively, as shown in FIG. 6, a plurality of circular holes 84 may be formed in the leg piece portion 57 to form the extension portion 85.

Further, as shown in FIG. 7, a plurality of slit-shaped notches 87 may be formed from both sides of the leg piece portion 57 to form an extension portion 88. As shown in FIG. The extending portions 93 may be formed by forming the bent portions 91 and 92 along the width direction of the portion 57.

Further, as shown in FIG. 9, the leg piece portion 57 may be folded back in an S-shape along the longitudinal direction to form the folded back portion 94. That is, the folded portion 94 has a pair of bent portions 94a and a flat portion 94b connecting the bent portions 94a.
When a force in the extending direction is applied to the folded portion 94, while the films such as polyester forming the leg pieces 57 are in sliding contact with each other, for example, the flat portion 94b is deformed into a wavy shape, It is designed to absorb stress. Further, as shown in FIGS. 10 to 13, in the folded-back portion 94, protectors 95c, 95c each having a cylindrical shape or a columnar shape are arranged inside the bent portions 94a, 94a, respectively. Both ends of 95c are connected by connecting bodies 95d, 95d to maintain the folded shape, and the bending radii of the bent portions 94a, 94a are prevented from becoming equal to or smaller than a predetermined dimension, and the membrane switch is formed. 33 conductive parts can be protected. And each protector
95c and 95c may be formed integrally with the leg piece 57 of the film switch 33 by injection molding, or may be formed of nylon resin separately from the leg piece 57. Also, each connected body 95d, 95
The d can be formed separately or thinly from the protector 95c by an elastic body such as a thermoplastic elastomer. Then, when a force in the extending direction is applied to the folded-back portion 94, the connecting bodies 95d, 95d are easily deformed due to bending, etc., and as shown in FIG.
As the 95c approach each other, the folded back portion 94 extends to absorb the stress, and as shown in FIG.
As the 95c rotates with respect to the other protector 95c, the folded back portion 94 extends to absorb the stress.

Further, as shown in FIG. 14, an extension portion 96 can be formed by forming a portion composed of a plurality of connecting pieces 95 having a substantially V shape in a plan view at an intermediate portion of the leg piece portion 57. . Then, when a force in the extending direction is applied to the extending portion 96, each connecting piece 95 can be deformed to absorb the stress as shown in FIG. 15, and at this time, a predetermined number of connecting pieces 95 are formed. May be cut to absorb the stress.

Further, in each of the above embodiments, the cover body 34
The film switch 33 is arranged between the folded airbag 25 and the air bag 25. For example, as shown in FIG. 16 and FIG.
A substantially box-shaped inner body 101 having an opened lower surface is arranged between the cover body 34 and the folded airbag 25, and the switch unit 56 of the film-shaped switch 33 is disposed between the inner body 101 and the cover body 34. May be arranged. Also, this inner body 10
1 is similar to the cover body 34 in that the peripheral wall portion 102 is fixed to the base plate 21 and the fragile tear line 103 is recessed on the upper surface, and the portion surrounded by the tear line 103 moves forward and backward when the airbag 25 is inflated. It is a part of the door that expands to. Further, a plurality of caulking pins 54 for heat caulking are projectingly provided around the door piece of the inner body 101.

Then, using such an inner body 101, the caulking pins 54 protruding from the upper surface of the inner body 101 are used.
When the switch part 56 of the membrane switch 33 is fixed by using, the expansion part 75 which also serves as the deformation part is deformed in the contraction direction as well, thereby smoothing the deploying operation of the door piece part of the inner body 101. Inflation and deployment of the airbag 25 can be facilitated.

Further, in each of the above embodiments, the cover body 34
Alternatively, the film switch 33 is fixed by caulking the caulking pin 54 provided on the inner body 101 to the film switch 33. For example, the film switch 33 is fixed to the back surface of the cover body 34 without using the caulking pin 54. It may be welded to the side or may be adhered using an adhesive, a double-sided tape or the like.

[0043]

According to the air bag device of the first aspect, when the air bag is inflated, the door piece of the cover body expands while curving and is attached along the back surface side of the cover body. When the membranous switch bends,
The extension portion formed on the attachment portion extends, and the extension force applied to the membrane switch can be absorbed. Therefore,
No strong force is applied to the member to which the membrane switch is attached or the portion attached to the cover body, the membrane switch can be reliably held, and the cover body can be smoothly curved to inflate and deploy the airbag. it can.

According to the airbag device of claim 2,
In addition to the effect of the first aspect, since the extension portion is formed by forming the opening portion in the leg piece portion, it is possible to facilitate the manufacture of the film switch and reduce the manufacturing cost of the airbag device.

According to the airbag device of claim 3,
In addition to the effect according to claim 1, since the extending portion is configured by forming a bent portion formed by bending the leg piece portion, manufacturing of the membrane switch is facilitated and manufacturing cost of the airbag device is reduced. can do.

According to the airbag device of claim 4,
In addition to the effect according to claim 1, since the extending portion is configured by forming a folded portion formed by folding back the leg piece portion along the longitudinal direction, the extending portion is greatly extended and a force in the extending direction applied to the membrane switch. Can be absorbed smoothly.

According to the airbag device of claim 5,
When the airbag expands and the door piece of the inner body expands together with the switch part of the membrane switch attached to the front side of this door piece, the leg piece of the membrane switch can be contracted and deformed. Since such a deformable portion is provided, the influence of the membrane switch on the deployment of the door piece of the inner body is reduced, and the inflation and deployment of the airbag can be facilitated.

[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 cross-sectional view of the above airbag device.

FIG. 4 is a perspective view of the same cover body and the membrane switch in an exploded state.

FIG. 5 is a partial perspective view showing another embodiment of the membrane switch of the airbag device of the present invention.

FIG. 6 is a partial perspective view showing still another embodiment of the membrane switch of the airbag device of the present invention.

FIG. 7 is a partial perspective view showing still another embodiment of the membrane switch of the airbag device of the present invention.

FIG. 8 is a partial perspective view showing still another embodiment of the membrane switch of the airbag device of the present invention.

FIG. 9 is a partial perspective view showing still another embodiment of the membrane switch of the airbag device of the present invention.

FIG. 10 is a cross-sectional view of a part of the same membrane switch.

FIG. 11 is an exploded perspective view of a part of the same membrane switch.

FIG. 12 is an explanatory view showing the operation of the above film switch.

FIG. 13 is an explanatory diagram showing the operation of the above film switch.

FIG. 14 is a partial perspective view showing still another embodiment of the membrane switch of the airbag device of the present invention.

FIG. 15 is a partial perspective view showing the operation of the above film switch.

FIG. 16 is an exploded perspective view showing another embodiment of the airbag device of the present invention.

FIG. 17 is an explanatory view showing the structure of the above airbag device.

[Explanation of symbols]

 14 Airbag device 21 Base plate as a member to be mounted 25 Airbag 33 Membrane switch 34 Cover body 56 Switch part 57 Leg piece part 72 Leg piece part mounting hole that constitutes the leg piece mounting part 75 Extension part that also functions as deformation part 76 Opening 91, 92 Bend 94 Fold back 101 Inner body

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroshi Yakushiji 218 Aoshima-cho, Fuji-shi, Shizuoka Japan Plast Co., Ltd.

Claims (5)

[Claims] 1. An airbag which is inflated by the inflow of gas, an elastically deformable cover body which is provided with a door piece portion which covers the airbag and expands when the airbag is inflated, and a door piece portion of the cover body. A switch part that is attached along the back surface side and is closed at the time of deformation; and a film-like switch provided with a leg piece part that extends from this switch part and forms a leg piece attachment part that is fixed to a member to be attached. The airbag device, wherein the leg portion of the membrane switch is provided with an extension portion that is extendable and deformable on the switch portion side of the leg attachment portion. 2. The airbag apparatus according to claim 1, wherein the extension portion is formed by forming an opening in the leg piece portion. 3. The airbag device according to claim 1, wherein the extension portion is formed by forming a bent portion formed by bending a leg piece portion. 4. The airbag device according to claim 1, wherein the extending portion is formed by forming a folded-back portion formed by folding back the leg piece along the longitudinal direction. 5. An airbag which is inflated by the inflow of gas, an inner body having a door piece portion which covers the airbag and expands when the airbag is inflated, and an elastically deformable cover body which covers the inner body. A switch portion which is located between the inner body and the cover body and which is attached to the front surface side of the door piece portion of the inner body and which is closed when pressed; and a switch portion which extends from the switch portion and is fixed to a member to be attached. A film-shaped switch provided with a leg piece portion having a leg piece attachment portion formed therein, and a deformable portion capable of being contracted and deformed is provided in the attachment portion of the membrane switch. apparatus.