JP2000222973A - Switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a switch capable of preventing a stay of water drops between a pair of fixed contacts even if water drops are splashed and surely preventing a short circuit between a pair of fixed contacts. SOLUTION: This switch has a pair of fixed contacts 9, 10 made of a conductive wire material and a housing 2 for supporting a pair of fixed contacts 9, 10 with they being close adjacent, and an exposed part being exposed from an outer wall surface 5a of a bottom 5 of the housing 2 to the outside of the housing 2 is installed in a pair of fixed contacts 9, 10, and insulating walls 7, 8 are installed over the whole facing surfaces of a pair of fixed contacts 9, 10 on the outer wall surface 5a of the bottom 5, between the exposed part of one fixed contact 9 and the exposed part of the other fixed contact 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch suitable for use in, for example, a washing machine, and more particularly to an improvement in a terminal portion of the switch.

[0002]

2. Description of the Related Art FIGS. 4 to 6 are for explaining the prior art of this type of switch.
Is a first housing 32 having a pair of fixed contacts 39 and 40 and a movable contact 41, a first stem 42 housed in a housing 34 of the first housing 32, and a first housing 32. An insulator 43 and a waterproof member 44 for closing the storage portion 34, a second housing 45 supported by the first housing 32, and a second stem stored in a storage portion 47 of the second housing 45; 50.

The first housing 32 is formed in a cylindrical shape with a bottom from an insulating synthetic resin material, and an inside of a cylindrical wall 33 is a storage portion 34. An annular projection 33a is provided upright at the upper end of the cylindrical wall 33.
Is provided with a rectangular projection 36 integrally with the outer wall surface 35a.

A pair of fixed contacts 39 and 40 are made of a conductive wire, and are formed in an L shape by bending one end of the fixed contact 39 at a right angle.
a and the terminal portion 39 connected to the base portion 39a and bent.
b, and a contact 39c is formed on the base 39a. The other fixed contact 40 has a base 40a and a terminal 40b connected to the base 40a and bent, and a contact 40c is formed on the base 40a.

The pair of fixed contacts 39, 40
As shown in FIG. 5 and FIG. 6, in a state where the terminal portions 39b and 40b are located on the opposite sides via the protrusion 36 of the first housing 32, the base portions 39a and 40a approached to each other by insert molding. The first contact 32 is embedded in the protrusion 36 and is supported by the first housing 32.
The other end of 9a is exposed from the side 36a of the protrusion 36 along the outer wall surface 35a of the bottom 35, and the terminal 39b is exposed along the side 36b of the protrusion 36, and the other is fixed. The contact 40 is connected to the other end of the base 40 a by the side 3 of the projection 36.
6b is exposed along the outer wall surface 35a of the bottom 35, and the terminal 40b is exposed along the side 36a of the projection 36. Also, the contacts 39c, 40c formed on the bases 39a, 40a are connected to the housing 3 of the first housing 32.
4, it is exposed from the inner wall surface of the bottom 35.

The movable contact 41 is formed in a dome shape from a conductive thin plate made of silver-plated phosphor bronze or the like.
The first and second housings 32 are housed in the housing portion 34 so as to cover the contact points 39c and 40c, and are fixed to the inner wall surface of the bottom portion 35.

The first stem 42 is formed in a substantially cylindrical shape from an insulating synthetic resin material, and has a small-diameter portion 42a, a large-diameter portion 42b continuously provided below the small-diameter portion 42a, and a large-diameter portion. And a pressing portion 42c protruding from the lower surface of 42b. The first stem 42 is housed in the housing portion 34 of the first housing 32, and the pressing portion 42c is in contact with the top of the movable contact 41.

The insulator 43 has elasticity, is formed in a substantially circular sheet shape from a resin material such as polyimide, and has an annular protrusion 33a of the first housing 35.
Is placed on the upper end of the cylindrical wall 33 inside the inside, and the storage portion 34 is closed. And, this insulator 34
The upper surface of the small diameter portion 42a of the first stem 42 is in contact with the lower surface of the first stem 42.

The waterproof member 44 has elasticity and is formed of a rubber material such as EPDM into a sheet shape substantially the same as the insulator 43. The insulator 43 is provided inside the annular projection 33a of the first housing 32. It is overlaid on top and placed on the upper end of the cylindrical wall 33.

The second housing 45 is formed in an inverted bowl shape from an insulating synthetic resin material, and a storage portion 47 is formed inside the cylindrical wall 46. In addition, at the lower end of the cylindrical wall 46,
A ring-shaped flange 48 extending in the radial direction is provided integrally,
An annular ridge 48 a is formed on the lower surface of the flange 48, and a circular hole 4 is formed in the center of the top plate 49.
9a is drilled.

The second housing 45 has a flange 48 mounted on the upper end of the cylindrical wall 33 in contact with the waterproof member 44 inside the annular projection 33a of the first housing 32. The protrusions 48 a sandwiched between the annular protrusion 33 a and the upper end of the cylindrical wall 33 and formed on the lower surface of the flange 48 are cut into the waterproof member 44 and supported by the first housing 32.

The second stem 50 is formed of an insulating synthetic resin material, and has a cylindrical push button portion 51;
A circular flange 52 provided at the lower end of the push button 51
And a pressing portion 53 provided on the lower surface of the flange portion 52. The pressing portion 53 has four supporting portions 5 on its outer peripheral surface.
3a are provided in a cross shape every 90 °.

The second stem 50 has a push button portion 51 which is formed in the hole 4 of the top plate portion 49 of the second housing 45.
9a, the upper surface of the flange portion 52 is in contact with the lower surface of the top plate portion 49, and the pressing portion 53 is pressed by the waterproof member 44 and the insulator 43.
And the central portion of the small diameter portion 42a of the first stem 42.

Next, the switch 31 constructed as described above is used.
The assembling method will be described first. First, the terminal portions 39b,
The bases 39a, 4 are brought closer to each other while the base 40b is located on the opposite side of the first housing 32 via the protrusion 36 of the first housing 32.
0a is embedded in the protrusion 36 to form a pair of fixed contacts 39, 40.
The movable contact 41 is accommodated in the accommodating portion 34 of the first housing 32 supporting the first contact 32, and the contact 39 of the pair of fixed contacts 39, 40 is accommodated.
The movable contact 41 is fixed to the inner wall surface of the bottom 35 in a state where the movable contacts 41 and 40c are covered. Next, the first stem 42 is housed in the housing portion 34 of the first housing 32, and the pressing portion 42 c is brought into contact with the top of the movable contact 41.

Next, the insulator 43 is placed on the upper end of the cylindrical wall 33 of the first housing 32, and then the waterproof member 44 is overlaid on the insulator 43. Next, the second stem 50 is stored in the storage portion 47 of the second housing 45, and the push button portion 51 is made to protrude from the hole portion 49a of the top plate portion 49 of the second housing 45.
8 is brought into contact with the waterproof member 44 so that the second housing 45
Is placed on the upper end of the cylindrical wall 33 of the first housing 32.

Thereafter, the annular projection 33a is gradually pressed inward (in the direction of the arrow B in FIG. 5) by appropriate pressing means such as a roller to plastically deform the annular projection 33a and the cylindrical projection 33a.
The second housing 45 is supported by the first housing 32 by sandwiching the flange 48 of the second housing 45 with the upper end of the second housing 45.

The assembly of the switch 31 is completed in this manner, but after the assembly, the ridges 48a formed on the lower surface of the flange portion 48 bite into the waterproof member 44 and the inside of the storage portion 34 of the first housing 32 is formed. And the upper end surface of the small diameter portion 42a of the first stem 42 and the pressing portion 42c abut on the lower surface of the insulator 43 and the top of the movable contact 41, respectively, and the second stem 50 holds the upper surface of the flange portion 52 thereof. Second
In a state where the pressing portion 53 is in contact with the lower surface of the top plate portion 49 of the housing 45 and is prevented from falling upward, the pressing portion 53 and the central portion of the small diameter portion 42a of the first stem 42 via the waterproof member 44 and the insulator 43. They are facing each other.

The switch 3 assembled as described above
Reference numeral 1 designates a terminal unit 39b, 40b connected to an electric circuit of a circuit board (not shown) and incorporated in a washing machine or the like to set and control various operations. That is, when the push button portion 51 of the second stem 50 is pressed, the second stem 50 slides in the storage portion 47 of the second housing 45, and the pressing portion 53 deflects the waterproof member 44 and the insulator 43 to form the second stem 50. The small diameter portion 42a of the first stem 42 is pressed. With this pressing, the pressing portion 42c of the first stem 42 presses the movable contact 41 and deflects it, so that the movable contact 41 is inverted and comes into contact with the contacts 39c and 40c of the pair of fixed contacts 39 and 40 to form a pair. Between the fixed contacts 39 and 40 is turned on to switch on, and various operations are set and controlled.

When the pressing of the push button 51 of the second stem 50 is released in this state, the waterproof member 44 and the insulator 43 return to their original states with their respective elastic restoring forces. As the second stem 50 is lifted, the movable contact 41 is released from bending, and the movable contact 4 is released.
As a result, the first stem 42 is pushed up by the reverse return force, and the movable contact 41 becomes the contact 3 of the pair of fixed contacts 39 and 40.
9c, 40c, and the switch-off state is established in which conduction between the pair of fixed contacts 39, 40 is released.

[0020]

However, in the prior art of the above-described switch, when a water droplet is applied to the switch 31 when the switch 31 is used in a washing machine or the like and used near the water, the switch is hatched in FIG. Water droplets may accumulate in a region C over the entire opposing surfaces of the pair of fixed contacts 39 and 40 indicated by a band. For this reason, there is a possibility that the pair of fixed contacts 39 and 40 may be short-circuited due to the water droplets, causing a short circuit. In order to prevent the switch 31 from being covered, measures have been taken to cover the periphery of the switch 31 with a cover (not shown). The present invention has been made in view of the above-described circumstances, and an object of the present invention is to prevent a water droplet from collecting between a pair of fixed contacts even when a water droplet is applied, and to reliably prevent a short circuit between the pair of fixed contacts. Is to provide a switch.

[0021]

In order to achieve the above object, the present invention comprises a pair of fixed contacts made of a conductive wire, and a housing for supporting the pair of fixed contacts in close proximity to each other. The fixed contact is provided with an exposed portion facing the outside of the housing from the outer wall surface of the bottom of the housing, and the bottom portion is provided between the exposed portion of the one fixed contact and the exposed portion of the other fixed contact. The main feature of the present invention is that an insulating wall is provided on the outer wall surface over the entire opposing surfaces of the pair of fixed contacts.

In the above structure, the bottom has a projection integrally formed with an outer wall surface thereof, and the pair of fixed contacts has a base and a terminal connected to the base and bent.
In a state where these terminal portions are located on opposite sides via the protrusion, the base is embedded in the protrusion, the pair of fixed contacts is supported by the housing, and the pair of fixed contacts are supported by the side of the protrusion. A part of the base portion of the fixed contact is exposed along the outer wall surface of the bottom to provide the exposed portion, and the terminal portions of the pair of fixed contacts are exposed along a side portion of the protrusion, Between the exposed portion of the base of the one fixed contact and the terminal of the other fixed contact, and between the terminal of the one fixed contact and the exposed portion of the base of the other fixed contact; In the above, an insulating wall is provided on an outer wall surface of the bottom portion over all opposing surfaces of the pair of fixed contacts.

Further, the insulating wall is formed to be larger than the diameter of at least one of the pair of fixed contacts.

Further, an end surface of the insulating wall farther from the protrusion is tapered.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a switch according to the present invention will be described below with reference to FIGS.

The switch 1 has a pair of fixed contacts 9, 1
0, a first housing 2 having movable contacts 1, a first stem 12 housed in a housing 4 of the first housing 2, and an insulator for closing the housing 4 of the first housing 2. 13 and a waterproof member 14, a second housing 15 supported by the first housing 2, and a second stem 20 housed in the housing 17 of the second housing 15.

The first housing 2 is formed in a cylindrical shape with a bottom from an insulative synthetic resin material. The inside of the cylindrical wall 3 is a storage portion 4, and an annular protrusion is formed on the upper end of the cylindrical wall 3. 3
a is erected. In addition, on the outer wall surface 5a of the bottom 5,
A rectangular projection 6 is provided integrally, and insulating walls 7 and 8 are respectively provided on both sides 6a and 6b of the projection 6.
Is provided. The end faces of the insulating walls 7 and 8 that are farther from the protrusion 6 are tapered.

The pair of fixed contacts 9 and 10 are made of a conductive wire, and are formed in an L-shape by bending one end thereof at a right angle. One fixed contact 9 is connected to a base 9a and the base 9a. And a bent terminal portion 9b, and a contact 9c is formed on the base 9a so as to protrude.
The other fixed contact 10 has a base 10a and this base 1
And a terminal portion 10b which is connected and bent to 0a, and a contact 10c is formed on the base portion 10a by bulging. The pair of fixed contacts 9 and 10 are shown in FIG.
As shown in FIG. 3, in a state where the terminal portions 9b and 10b are located on opposite sides via the protrusion 6 of the first housing 2, the bases 9a and 10a which are brought close to each other are embedded in the protrusion 6 by insert molding. The first housing 2 supports the first housing 2.

One of the pair of fixed contacts 9 and 10 is connected to the other end of the base 9 a by the side 6 a of the projection 6.
, The terminal portion 9b is exposed along the side portion 6b of the projection 6, and the other fixed contact 10 has the other end side of the base 10a projecting from the base portion 10a. 6 is exposed along the outer wall surface 5a of the bottom 5 from the side 6b, and the terminal 10b is exposed along the side 6a of the protrusion 6. Also, contact points 9 formed on the bases 9a, 10a
c, 10c are exposed from the inner wall surface of the bottom part 5 in the storage part 4 of the first housing 2. The exposed portion of the base 9a of one fixed contact 9 and the other fixed contact 10
And between the terminal portion 9b of one fixed contact 9 and the exposed portion of the base 10a of the other fixed contact 10 over the entire opposing surfaces of the pair of fixed contacts 9, 10. The insulating walls 7 and 8 are located respectively. The height of the insulating wall 7 is higher than the diameter of the base 9a of one fixed contact 9, and the height of the insulating wall 8 is the base 10a of the other fixed contact 10. Is formed higher than the diameter.

The insulating walls 7 and 8 are connected to the exposed portion of the base 9a of one fixed contact 9 and the terminal 10 of the other fixed contact 10.
b, and between the terminal portion 9b of one fixed contact 9 and the exposed portion of the base 10a of the other fixed contact 10 over the entire opposing surfaces of the pair of fixed contacts 9, 10. In this case, the entire exposed portion of the base 9a of one fixed contact 9 is covered with the insulating wall 7 between them.
The entire exposed portion of the base 10 a of the other fixed contact 10 may be covered with the insulating wall 8.

The movable contact 11 is formed in a dome shape from a conductive thin plate made of silver-plated phosphor bronze or the like.
It is housed in the housing part 4 of the first housing 2 so as to cover the ten contacts 9c, 10c, and is fixed to the inner wall surface of the bottom part 5.

The first stem 12 is formed in a substantially cylindrical shape from an insulating synthetic resin material, and has a small-diameter portion 12a, a large-diameter portion 12b continuously provided below the small-diameter portion 12a, and a large-diameter portion. And a pressing portion 12c protruding from the lower surface of 12b. The first stem 12 is housed in the housing part 4 of the first housing 2, and the pressing part 12 c is in contact with the top of the movable contact 11.

The insulator 13 has elasticity and is formed in a substantially circular sheet shape from a resin material such as polyimide. The upper end of the cylindrical wall 3 inside the annular projection 3a of the first housing 2 is provided. And the storage unit 4 is closed. The upper end surface of the small diameter portion 12 a of the first stem 12 is in contact with the lower surface of the insulator 13.

The waterproof member 14 has elasticity and is formed from a rubber material such as EPDM into a sheet shape substantially the same shape as the insulator 13. The insulator 13 is provided inside the annular projection 3 a of the first housing 2. It is superimposed on top and placed on the upper end of the cylindrical wall 3.

The second housing 15 is formed in an inverted bowl shape from an insulating synthetic resin material, and the inside of the cylindrical wall 16 is a storage portion 17. At the lower end of the cylindrical wall 16,
A ring-shaped flange portion 18 extending in the radial direction is provided integrally,
An annular ridge 18 a is formed on the lower surface of the flange 18, and a circular hole 1 is formed in the center of the top plate 19.
9a is drilled.

The second housing 15 has a flange 18 mounted on the upper end of the cylindrical wall 3 in contact with the waterproof member 14 inside the annular projection 3a of the first housing 2. The ridge 18a formed between the annular projection 3a and the upper end of the cylindrical wall 3 and formed on the lower surface of the flange 18 is cut into the waterproof member 14 and is supported by the first housing 2.

The second stem 20 is formed of an insulating synthetic resin material.
A circular flange 22 provided at the lower end of the push button 21
And a pressing portion 23 provided on the lower surface of the flange portion 22. The pressing portion 23 has four supporting portions 2 on its outer peripheral surface.
3a are provided in a cross shape every 90 °.

The second stem 20 has its push button portion 23 connected to the hole 1 in the top plate portion 19 of the second housing 15.
9a, the upper surface of the flange 22 is in contact with the lower surface of the top plate 19, and the pressing portion 23 is pressed by the waterproof member 14 and the insulator 13
The first stem 12 is opposed to the central portion of the small diameter portion 12a.

Next, a method of assembling the switch 1 configured as described above will be described. First, the terminal portions 9b, 10
In a state in which the bases 9a and 10b are located on the opposite sides via the protrusion 6 of the first housing 2, the adjacent bases 9a and 10a are buried in the protrusion 6 so that the pair of fixed contacts 9 and 10 are insulated from the insulating walls 7 and 8
The movable contact 11 is accommodated in the accommodating portion 4 of the first housing 2 supported on both sides of the fixed contact 9, and the contact 9 of the pair of fixed contacts 9, 10 is provided.
The movable contact 11 is fixed to the inner wall surface of the bottom 5 while covering c and 10c. Next, the first stem 12 is housed in the housing part 4 of the first housing 2, and the pressing part 12 c is brought into contact with the top of the movable contact 11.

Next, the insulator 13 is placed on the upper end of the cylindrical wall 3 of the first housing 2, and then the waterproof member 14 is overlaid on the insulator 13. Next, the second stem 20 is stored in the storage portion 17 of the second housing 15, and the push button 21 is moved to the top plate 1 of the second housing 15.
9, the flange 18 is brought into contact with the waterproof member 14 in this state, and the second housing 15 is
At the upper end of the cylindrical wall 3 of the housing 2.

Thereafter, the annular projection 3a is gradually pressed inward (in the direction of arrow A in FIG. 2) by a suitable pressing means such as a roller to plastically deform the annular projection 3a and the upper end of the cylindrical wall 3 and the annular projection 3a. To hold the flange 18 of the second housing 15
Is supported by the first housing 2.

The assembly of the switch 1 is completed in this manner, but after the assembly, the ridges 18a formed on the lower surface of the flange portion 18 bite into the waterproof member 14 and the inside of the storage portion 4 of the first housing 2 is formed. And the upper end surface of the small-diameter portion 12a of the first stem 12 and the pressing portion 12c are respectively connected to the insulator 1
3 and the top of the movable contact 11,
With the second stem 20 in a state in which the upper surface of the flange portion 22 is in contact with the lower surface of the top plate portion 19 of the second housing 15 and is prevented from falling upward, the pressing portion 23 removes the waterproof member 14 and the insulator 13. Through the small diameter portion 12a of the first stem 12
In a state facing the center of the camera.

The switch 1 thus assembled
Are connected to an electric circuit of a circuit board (not shown) by connecting the terminal portions 9a and 10a to a washing machine or the like, and set and control various operations. That is, the second stem 2
When the push button 21 is pressed, the second stem 20 is moved to the second position.
The pressing portion 23 deflects the waterproof member 14 and the insulator 13 to press the small diameter portion 12 a of the first stem 12. With this pressing, the pressing portion 12c of the first stem 12 moves to the movable contact 1
1 is pressed and bent, the movable contact 11 is inverted, and contacts the contacts 9c and 10c of the pair of fixed contacts 9 and 10 to conduct between the pair of fixed contacts 9 and 10 to be in a switch-on state. The operation is set and controlled.

When the pressing of the push button 21 of the second stem 20 is released in this state, the waterproof member 14 and the insulator 13 return to their original states by their respective elastic restoring forces. The movable contact 11 is lifted up together with the portion 21 to return to the original state.
1, the first stem 12 is pushed up by the reversal return force, and the movable contact 11 is brought into contact with the contact 9 of the pair of fixed contacts 9, 10.
c, 10c, and a switch-off state in which conduction between the pair of fixed contacts 9, 10 is released.

In the switch 1 constructed and assembled as described above, even if the switch 1 is installed in a washing machine or the like and is used by the water, the insulating walls 7 and 8 are not affected.
Accordingly, between the exposed portion of the base 9a of one fixed contact 9 and the terminal 10b of the other fixed contact 10, and between the terminal 9b of one fixed contact 9 and the base 10a of the other fixed contact 10
Are separated from each other, so that they are not connected to each other by water droplets, the pair of fixed contacts 9 and 10 can always be kept in a non-conductive state, and the pair of fixed contacts Short circuit between 9 and 10 can be reliably prevented.

Further, even if the size and shape of the first housing 2 change due to a request of a customer or the like, the pair of fixed contacts 9 and
By keeping the size (width H of the protrusion 6 in FIG. 3) of the protrusion 6 in which the bases 9a, 10a of the base 10 are buried constantly constant, the terminal portions 9 of the pair of fixed contacts 9, 10 are maintained.
b, 10b can be unified, and the terminal 9
Standardization of the dimension between b and 10b can be achieved.

[0047]

The present invention is embodied in the form described above and has the following effects.

There is provided a pair of fixed contacts made of a conductive wire, and a housing for supporting the pair of fixed contacts in close proximity to each other. The pair of fixed contacts face the outside of the housing from the outer wall surface at the bottom of the housing. An exposed portion is provided to be exposed, and an insulating wall is provided between the exposed portion of the one fixed contact and the exposed portion of the other fixed contact on the outer wall surface of the bottom portion over the entire opposing surface of the pair of fixed contacts. Since the insulating wall is provided, the exposed portion of the one fixed contact and the exposed portion of the other fixed contact are divided by the insulating wall, and the exposed portion of the fixed contact is not connected by water droplets, and the space between the pair of fixed contacts is The non-conducting state can always be maintained, and short circuit between the pair of fixed contacts can be reliably prevented.

The bottom has a projection integrally formed with the outer wall surface thereof, and the pair of fixed contacts has a base and a bent terminal connected to the base, and these terminals are connected to the projection. The pair of fixed contacts are supported by the housing with the bases buried in the protrusions in a state where they are located on opposite sides of each other through the base, and one side of the bases of the pair of fixed contacts is supported from the side of the protrusions. A portion is exposed along the outer wall surface of the bottom portion to provide the exposed portion, and the terminal portions of the pair of fixed contacts are exposed along side portions of the protrusion,
Between the exposed portion of the base of the one fixed contact and the terminal of the other fixed contact, and between the terminal of the one fixed contact and the exposed portion of the base of the other fixed contact; In the above, since an insulating wall is provided on the outer wall surface of the bottom over the entire opposing surfaces of the pair of fixed contacts, a part of the base from the protrusion can be removed without embedding the entire base in the housing. Since the pair of fixed contacts can be supported by being exposed to the outside of the housing, the material cost of the housing can be reduced by exposing a part of the base. Further, even if the size and shape of the housing change due to a request of a customer or the like, the size of the protrusion that embeds the bases of the pair of fixed contacts is always kept constant, so that the size of the pair of fixed contacts is reduced. The dimensions between the terminals can be unified, and the dimensions between the terminals can be standardized.

Further, since the insulating wall is formed higher than at least one diameter of the pair of fixed contacts,
Between the exposed portion of the base of the one fixed contact and the terminal of the other fixed contact, or between the terminal of the one fixed contact and the exposed portion of the base of the other fixed contact. Water droplets adhering to the surface can be reliably separated.

Further, since the end face of the insulating wall remote from the protrusion is tapered, no water drops accumulate on the end face of the insulating wall far from the protrusion. Adhered water droplets can be reliably separated.

[Brief description of the drawings]

FIG. 1 is a plan view of a switch according to the present invention.

FIG. 2 is a cross-sectional view of the switch of the present invention.

FIG. 3 is a rear view of the switch according to the present invention.

FIG. 4 is a plan view of a conventional switch.

FIG. 5 is a cross-sectional view of a conventional switch.

FIG. 6 is a rear view of a conventional switch.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Switch 2 1st housing 3 Cylindrical wall 3a Annular protrusion 4 Storage part 5 Bottom 5a Outer wall surface 6 Projection 6a Side 6b Side 7 Insulation wall 8 Insulation wall 9 One fixed contact 9a base 9b Terminal 9c Contact 10 The other fixed contact 10a base 10b terminal 10c contact 11 movable contact 12 first stem 12a small diameter portion 12b large diameter portion 12c pressing portion 13 insulator 14 waterproof member 15 second housing 16 cylindrical wall 17 housing 18 flange 18a annular Projection 19 Top plate part 19a Hole part 20 Second stem 21 Push button part 22 Flange part 23 Press part 23a Support part

Claims (4)

[Claims] 1. A housing comprising a pair of fixed contacts made of a conductive wire, and a housing for supporting the pair of fixed contacts in close proximity to each other, from the outer wall surface at the bottom of the housing to the outside of the housing. An exposed portion that is exposed to face is provided, and between the exposed portion of the one fixed contact and the exposed portion of the other fixed contact, the outer wall surface of the bottom portion is insulated over the entire facing surface of the pair of fixed contacts. A switch provided with a wall. 2. The bottom is provided with a projection integrally with an outer wall surface thereof, and the pair of fixed contacts has a base and a bent terminal connected to the base, and these terminals are connected to the projection. The pair of fixed contacts are supported by the housing with the bases buried in the protrusions in a state where they are located on opposite sides of each other through the base, and one side of the bases of the pair of fixed contacts is supported from the side of the protrusions. A portion is exposed along an outer wall surface of the bottom portion to provide the exposed portion, and the terminal portions of the pair of fixed contacts are exposed along side portions of the protrusion, and the base portion of the one fixed contact is exposed. Between the exposed portion and the terminal portion of the other fixed contact, and between the terminal portion of the one fixed contact and the exposed portion of the base portion of the other fixed contact, on the outer wall surface of the bottom portion. Across the entire opposing surface of the pair of fixed contacts The switch according to claim 1, wherein an insulating wall is provided. 3. The switch according to claim 2, wherein the insulating wall is formed to be higher than a diameter of at least one of the pair of fixed contacts. 4. The switch according to claim 3, wherein the insulating wall has a tapered end face farther from the protrusion.