JPH09288936A - Seesaw switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the invasion of dusts into a portion concerning the turning of a cam by integrally forming lugs on the cam which can block a gap between the cam and an upper case. SOLUTION: A dust guard 16 is integrally provided below a shaft 15a1(15a1) in a cam main body 15a. One pair of lugs 16a, 16b protrusively formed reverse open angle-like from the center of the cam main body 15a toward the one end side of the cam main body 15a are formed in the dust guard 16. When a window glass is driven toward an opening side, and the car room inside is cleaned by a cleaner, dust in a car flows by the air flow of the cleaner, the bent portion 15b1 of the cam main body 15a covers the a case opening portion 2a9 over the case opening portion 2a9, and simultaneously a gap between the cam 15 and the case opening portion 2a9 is blocked. Therefore, the dust or the like is not allowed to invade the inside of a case 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch for switching a circuit between a conducting state and a disconnecting state, and more particularly to a seesaw type switch for switching operation in a seesaw type.

[0002]

2. Description of the Related Art As a seesaw switch for switching a circuit between a conducting state and a disconnecting state, a V-shaped movable contact plate is rotatably arranged in a seesaw manner on a plurality of fixed contact terminals arranged in a case. By pressing this movable contact plate with a cam, it electrically connects or disconnects to one of the fixed contact terminals, and the circuit electrically connected to the fixed contact terminal outside the case is created. There are known ones that are turned on or off.

In such a seesaw-type switch, the cam is rotatably mounted in the case opening formed so as to communicate from the outside of the case to the inside thereof, and the operation lever mounted on the cam outside the case is operated by a finger. When pressed, the cam rotates within the case opening and presses the movable contact plate toward the fixed contact terminal side.

[0004]

However, in the above-described conventional seesaw-type switch, the case opening formed in the case has a size that does not collide when the cam rotates, and the cam rotates. Since there is a gap on the sloping side of the car, if you clean the inside of the vehicle with a blow-out type vacuum cleaner that blows off air dust, the inside of the vehicle, such as the top of the operating lever or the case, It cannot be said that dust or the like does not enter the case through the above-mentioned gap, and if dust or the like that enters the case adheres to the part related to the rotation of the cam, it becomes a resistance when the cam rotates, The cam may malfunction, and if dust that has entered the case adheres to the movable contact plate or fixed contact terminal, the movable contact plate and fixed contact terminal are electrically connected or disconnected. Since that could cause such conduction failure contacts when benefit, there is a problem that it is necessary so as not to penetration of dust 挨等 into the case. Further, unlike the above, even when the vehicle interior is cleaned with a suction type vacuum cleaner, dust or the like may enter the case through the above-mentioned gap due to the airflow generated in the vehicle interior, and the same as above. It may cause malfunction or poor continuity.

In order to solve the above problems,
There was a rubber grommet placed between the cam and the case opening, but since the grommet is a component with a different structure from the cam and case, parts management related to assembly becomes complicated and However, the number of steps for assembling a separate grommet is required, and there is a problem that the production efficiency may be deteriorated, and the above-mentioned problems cannot be solved.

[0006]

SUMMARY OF THE INVENTION The seesaw-type switch according to the present invention has a tongue piece formed integrally with a cam so as to prevent dust and the like from entering the case without impairing productivity related to assembly. An object of the present invention is to provide a seesaw-type switch that does not cause operation failure and conduction failure.

[0007]

Configuration of the Invention

[0008]

In a seesaw-type switch according to claim 1 of the present invention, an upper case and a lower case are formed integrally with each other, and the upper case has a cam support portion and a predetermined opening length. With a case opening having a case opening, a plurality of fixed contact terminals housed in the case, a seesaw-type rotatable arrangement on the fixed contact terminal, and electrically connected to one of the fixed contact terminals. The connectable movable contact plate and the movable contact plate penetrating through the case opening of the upper case of the case are rotatably supported by the cam supporting portion of the upper case, and the movable contact plate can be pressed against the fixed contact terminal. In a seesaw-type switch equipped with a cam, the cam
It is characterized in that a tongue piece capable of elastically slidably contacting the upper case on the side where the cam is inclined to integrally close the gap between the cam and the upper case is integrally formed.

In the seesaw-type switch according to claim 2 of the present invention, the cam has a case supporting portion rotatably supported by the cam supporting portion of the upper case, and the tongue piece is the case of the cam. It is characterized in that it is formed in a convex shape that is concentric with the support portion and has an arc shape.

In this case, when the cam supported by the case supporting portion is rotated by the cam supporting portion of the upper case, the tongue of the cam has a circular arc shape concentric with the case supporting portion to form a convex shape. The gap between the cam and the upper case is closed by elastically slidingly contacting the upper case on the side where the is inclined. Therefore, the tongue piece is not assembled separately from the cam, dust is not introduced into the part related to the rotation of the cam, and dust may be attached to the movable contact plate or the fixed contact terminal. Absent.

In the seesaw-type switch according to claim 3 of the present invention, the case sliding contact surface, which is a sliding contact surface with the upper case, is formed in an arched shape on the tongue of the cam. I am trying.

In this case, when the cam supported by the case support is rotated by the cam support of the upper case, the case sliding contact surface of the tongue of the cam is arcuate so that the upper of the cam is inclined. The elastic sliding contact with the case closes the gap between the cam and the upper case. Therefore, the tongue piece is not assembled separately from the cam, dust is not introduced into the part related to the rotation of the cam, and dust may be attached to the movable contact plate or the fixed contact terminal. Absent.

In the seesaw-type switch according to claim 4 of the present invention, the tongue piece of the cam is extended in a cantilever manner, and the case sliding contact surface of the tongue piece is longer than the opening length of the case opening portion of the upper case. It is characterized in that it has a slightly larger outer diameter.

In this case, when the cam supported by the case support portion is rotated by the cam support portion of the upper case, the case sliding contact surface of the tongue of the cam is formed into an arcuate shape so that the case formed on the upper case is formed. The gap between the cam and the upper case is closed by elastically slidingly contacting the upper case on the side where the cam is inclined, assuming that the length is slightly larger than the opening length of the opening. Therefore, the tongue piece is not assembled separately from the cam, dust is not introduced into the part related to the rotation of the cam, and dust may be attached to the movable contact plate or the fixed contact terminal. Absent.

In a seesaw-type switch according to a fifth aspect of the present invention, a case, a plurality of fixed contact terminals housed in the case, and a seesaw-type rotatably arranged on the fixed contact terminal. A movable contact plate electrically connected to any of the above, and a cam rotatably attached to the case and arranged so that the movable contact plate can be pressed against the fixed contact terminal,
A case which is formed in the case so that the cam can be inserted and has a predetermined opening length on the side where the rotating cam is inclined, and a cam which is formed integrally with the cam and is arranged in the case opening. Is characterized in that it is provided with a dust guard having a pair of tongues capable of elastically slidably contacting each of the cases on the inclined side and closing the gap between the cam and the case opening.

In this case, the movable contact plate is electrically connected to the fixed contact terminal to turn it on so that the cam is rotated with respect to the case, and the cam is not turned to be turned off so that the cam is not rotated. The tongue piece of the dust guard integrally formed with the cam is elastically pressed against the inclined case to close the gap between the cam and the case opening. Therefore, the dust guard is not assembled separately from the cam, dust does not enter the rotating part of the cam, and dust does not adhere to the movable contact plate or the fixed contact terminal. .

In the seesaw-type switch according to claim 6 of the present invention, the case is provided with a lower case to which the fixed contact terminal is fixed, and an upper case assembled to the lower case. The case opening is formed inside the cam support part that is formed to project on the case and rotatably supports the cam with an opening width slightly larger than the width dimension of the cam. It is characterized in that it is configured so as to project from the cam main body which is provided in the case and is arranged in the case opening, toward the inner edge of the case opening on the opening length direction side.

In this case, when the movable contact plate is electrically connected to the fixed contact terminal and the cam is rotated with respect to the case to be turned on and when the cam is not rotated to be turned off, the cam is rotated. By elastically pressing a pair of tongue pieces of a dust guard integrally formed with the cam on the opening length direction side of the case opening formed inside the cam supporting portion that is movably supported , The gap between the cam and the case opening is closed. Therefore, the dust guard is not assembled separately from the cam, and dust is not introduced into the part related to the rotation of the cam, and further,
No dust is attached to the movable contact plate or fixed contact terminal.

In the seesaw-type switch according to claim 7 of the present invention, the tongue piece of the dust guard has an arc shape concentric with the rotation center of the cam, and is substantially equal to the opening width of the case opening, and In addition to having a width that can be inserted into the case opening, the size that the tongue projects from the cam body is such that when the cam rotates to the rotation end on the upper case, it can project from the case opening. It is characterized by having the configuration.

In this case, the cam is rotated when the cam is rotated with respect to the case because the movable contact plate is electrically connected to the fixed contact terminal to be turned on and when the cam is not rotated because it is turned off. At the inner edge of the case opening formed inside the movably supported cam support on the side of the opening length direction, a pair of tongues included in the dust guard integrally formed with the cam are The gap between the cam and the case opening is closed by elastically pressure contacting the case opening so as to project from the case opening in response to the rotation. Therefore, the dust guard is not assembled separately from the cam, dust is not introduced into the part related to the rotation of the cam, and dust is attached to the movable contact plate or fixed contact terminal. There is no.

In the seesaw-type switch according to the eighth aspect of the present invention, the cam has the operation lever attached to one end side of the cam body, which is arranged outside the case, and is arranged inside the case. A slide pin capable of elastically pressing the movable contact plate via the return spring is housed on the other end side, and the dust guard is provided on the outer side of the tongue piece projecting toward the one end side of the cam body. It is characterized in that a case sliding contact surface capable of sliding contact is formed on the inner edge of the case opening on the opening length direction side.

In this case, when the operation lever is operated, the cam rotates with respect to the case, and the slide pin is electrically connected to the fixed contact terminal by the elastic repulsive force of the return spring to turn on. When the pressing is performed to bring the state into the state and when the operation lever is not operated and is in the off state, the side of the case opening formed inside the cam support portion in which the cam is rotatably supported is in the opening length direction side. A pair of tongues formed on the inner edge of the pair of tongues formed in the dust guard integrally formed with the cam as having a width substantially equal to the opening width of the case opening has a sliding contact surface in response to the rotation of the cam. The gap between the cam and the case opening is closed by elastically press-contacting as protruding from the opening. Therefore, the dust guard is not assembled separately from the cam, dust is not introduced into the part related to the rotation of the cam, and dust is attached to the movable contact plate or fixed contact terminal. There is no.

In the seesaw-type switch according to claim 9 of the present invention, one end of the cam body of the cam is concentric with the center of rotation of the cam and is curved so as to cover the case opening. It has a curved portion that is formed, an operation lever attachment portion that is slidable to the cam support portion is provided, and the tongue piece that is included in the dust guard is arranged inside the operation lever attachment portion. Is characterized by.

In this case, when the operation lever is operated, the cam rotates with respect to the case, and the slide pin presses the movable contact plate to electrically connect the movable contact plate to the fixed contact terminal to bring it into the ON state. When the operation lever is not operated and is in the OFF state, the cam is attached to the inner edge of the case opening formed inside the cam support portion that is rotatably supported on the opening length direction side. In the integrally formed dust guard, the sliding contact surfaces of the pair of tongues formed to have a width substantially equal to the opening width of the case opening project from the case opening in response to the rotation of the cam. The elastic pressure contact closes the gap between the cam and the case opening. At this time, the curved portion of the operation lever mounting portion of the cam also covers the upper portion of the case opening, so that the gap between the cam and the case opening is closed together with the dust guard. Therefore, the dust guard is not assembled separately from the cam, dust is not introduced into the part related to the rotation of the cam, and dust is attached to the movable contact plate or fixed contact terminal. There is no.

[0025]

In the seesaw-type switch according to claim 1 of the present invention, the movable contact plate is electrically connected to the fixed contact terminal to turn it on so that the cam rotates with respect to the case and the cam is turned off. Therefore, when the cam does not rotate, the tongue integrally formed with the cam elastically presses the case on the side where the cam is inclined to close the gap between the cam and the case opening. Therefore,
The tongue is not assembled separately from the cam,
Dust does not enter the part related to the rotation of the cam,
Furthermore, dust does not adhere to the movable contact plate or the fixed contact terminal.

Also in the seesaw type switch according to claim 2, claim 3, claim 4 and claim 5 of the present invention,
In the same manner as in claim 1, the tongue piece is not assembled separately from the cam, and dust is not introduced into the portion related to the rotation of the cam, and the movable contact plate or the fixed contact terminal is not dusted. Does not adhere.

[0027]

1 to 4 show an embodiment of a seesaw type switch according to the present invention.

The seesaw-type switch 1 shown includes a case 2, a first fixed contact terminal 3, a second fixed contact terminal 4, a third fixed contact terminal 5, a fourth fixed contact terminal 6, and a fifth fixed contact. A contact terminal 7, a sixth fixed contact terminal 8, a first movable contact plate 9, a second movable contact plate 10, a first slide pin 11,
It is composed of a second slide pin 12, a first return spring 13, a second return spring 14, a cam 15, a dust guard 16 and an operating lever 17, and in the figure only a single seesaw switch 1 is shown. Although shown, a plurality of seesaw-type switches 1 are usually arranged side by side on a case 2.

The case 2 is composed of an upper case 2a arranged on the upper side in the figure and a lower case 2b fitted on the lower side of the upper case 2a.

As shown in FIG. 1, the upper case 2a has a cam support portion 2a2 which is formed in a rectangular tubular shape so as to project on the top plate portion 2a1 substantially at the center of a flat plate-shaped top portion 2a1. Is provided. As shown in FIG. 4, the cam supporting portion 2a2 has a first end having a curved end surface concentric with the rotating cam 15 at a position facing the width direction of the cam 15 described later. , The second side plates 2a3, 2
Third and fourth side plates 2a5, 2a6 having a4 and arranged on the side where the rotating cam 15 is inclined.
The first and second side plates 2a3 and 2a4 are respectively provided with pivot holes 2a7 and 2a8 formed in a circular hole shape at substantially the centers thereof.

As shown in FIG. 2, the cam supporting portion 2a2 has an opening length dimension L1 on the side inclined when the cam 15 described later rotates, and is shown in FIG. As described above, the case opening 2a9 having the opening width dimension L2 slightly larger than the width dimension of the cam 15 is formed. A cam 15, which will be described later, is inserted into the case opening 2a9.

On the lower case 2b, the first fixed contact terminal 3, the second fixed contact terminal 4, the third fixed contact terminal 5, the fourth fixed contact terminal 6 and the fifth fixed contact terminal 5 are provided.
Fixed contact terminal 7 and sixth fixed contact terminal 8
Are insulated and fixed.

The first fixed contact terminal 3 is arranged substantially at the center of the seesaw-type switch 1. As shown in FIG. 1, the first fixed contact terminal 3 has a substantially U-shaped cross section, and the central portion has a lower case 2b. The first case, which will be described later, on both end portions of the lower case 2b that are embedded in the lower case 2b so as to be opposed to each other.
A movable contact plate support portion 3a having a notch shape for rotatably supporting the movable contact plate 9 in a seesaw type,
3b is formed. A first movable contact plate 9 to be described later is placed on the movable contact plate support portions 3a and 3b of the first fixed contact terminal 3, and the bottom portions of the movable contact plate support portions 3a and 3b are the first movable contact plate support portions 3a and 3b. Is electrically connected to the movable contact plate 9. The first fixed contact terminal 3 is electrically connected to an external circuit (not shown).
A second fixed contact terminal 4 and a third fixed contact terminal 5 are arranged apart from each other on both sides of the first fixed contact terminal 3.

The second fixed contact terminal 4 is formed in a flat plate shape, and is arranged at a predetermined distance from one end of the first fixed contact terminal 3, and is arranged on the lower case 2b. The protruding upper end side is the first described later.
Can be electrically connected to the movable contact plate 9 and the lower end side of the lower case 2b protruding downward is electrically connected to an external circuit (not shown).

The third fixed contact terminal 5 is formed in a flat plate shape, and is arranged at a distance from the other end of the first fixed contact terminal 3 by a predetermined dimension, and on the lower case 2b. The upper end side protruding to the first
Can be electrically connected to the movable contact plate 9 and the lower end side of the lower case 2b protruding downward is electrically connected to an external circuit (not shown).

The first movable contact plate 9 is formed in a substantially V shape, and the central portion thereof is placed on the movable contact plate support portions 3a and 3b of the first fixed contact terminal 3. The first movable contact plate 9 includes a first slide pin 1 whose central portion is housed in a cam 15 described later.
Since it is pressed against the movable contact plate support portions 3a and 3b of the first fixed contact terminal 3 by 1, it is electrically connected to the first fixed contact terminal 3 and a cam 15 described later is shown in FIG. When it is rotated from the neutral position A to the first position B shown in FIG. 3, the first fixed contact terminal 4 is electrically connected to the first fixed contact terminal 4 by rotating in a seesaw manner. Contact terminal 3 and second
The fixed contact terminal 4 of is conducted, and in contrast to this,
When a cam 15, which will be described later, is rotated about a neutral position A to a second position C opposite to the first position B, the cam 15 is rotated in a seesaw manner on the opposite side to the third position to thereby move the third position. Since it is electrically connected to the fixed contact terminal 5 of
Fixed contact terminal 3 and third fixed contact terminal 5
Are conducted.

The fourth fixed contact terminal 6 is arranged substantially in the center of the seesaw-type switch 1 and behind the above-mentioned first fixed contact terminal 3 in FIG.
As shown in Fig. 2, the central portion is embedded in the lower case 2b, and the central portion is embedded in the lower case 2b. In order to rotatably support the contact plate 10 in a seesaw type, notched movable contact plate support portions 6a and 6b are formed. A second movable contact plate 10, which will be described later, is placed in the movable contact plate supporting portions 6a and 6b of the fourth fixed contact terminal 6.
The bottoms of the movable contact plate support portions 6a and 6b are electrically connected to the second movable contact plate 10. The fourth fixed contact terminal 6 is electrically connected to an external circuit (not shown). On both sides of the fourth fixed contact terminal 6,
The fifth fixed contact terminal 7 and the sixth fixed contact terminal 8 are arranged apart from each other.

The fifth fixed contact terminal 7 is formed in a flat plate shape, is arranged at a predetermined distance from one end of the fourth fixed contact terminal 6, and protrudes above the lower case 2b. The upper end side can be electrically connected to a second movable contact plate 10 described later, and the lower end side protruding below the lower case 2b is electrically connected to an external circuit (not shown).

The sixth fixed contact terminal 8 is formed in a flat plate shape, is arranged at a predetermined distance from the other end of the fourth fixed contact terminal 6, and protrudes above the lower case 2b. The upper end side is electrically connectable to a second movable contact plate 10 described later, and the lower end side protruding downward of the lower case 2b is electrically connected to an external circuit (not shown).

The second movable contact plate 10 is formed in a substantially V shape, and is mounted on the movable contact plate support portions 6a and 6b of the fourth fixed contact terminal 6 at the center thereof. The second movable contact plate 10 has its central portion pressed against the movable contact plate support portions 3a and 3b of the fourth fixed contact terminal 3 by the second slide pin 12 housed in the cam 15 described later. Therefore, it is electrically connected to the first fixed contact terminal 3,
The cam 15 to be described later is changed from the neutral position A shown in FIG.
When it is rotated to the first position B shown in FIG. 6, the fourth fixed contact terminal 6 is electrically connected to the fifth fixed contact terminal 7 by rotating in a seesaw manner.
And the fifth fixed contact terminal 7 are electrically connected to each other, and on the contrary, the cam 15 to be described later has the first position centered on the neutral position A.
When rotated to a second position C opposite to the position B of
By rotating in a seesaw type on the opposite side to the above,
Since it is electrically connected to the sixth fixed contact terminal 8, the fourth fixed contact terminal 6 and the sixth fixed contact terminal 8 are electrically connected.

The first slide pin 11, the second slide pin 12, the first return spring 13 and the second return spring 14
Are attached to the cam 15.

The cam 15 is made of a resin (for example, polyacetal) which has a slight elastic repulsive force and is hard to be hardened at a low temperature. As shown in FIG. 2, the cam 15 has a substantially T-shaped vertical cross section. The cam support portion 2a is disposed above the formed cam body 15a and above the case opening portion 2a9 of the cam support portion 2a2 of the upper case 2a.
2 is provided with an operation lever attachment portion 15b having a curved portion 15b1 slidable in contact with the curved portions of the first and second side plates 2a3, 2a4. An operation lever 17 to be described later is fitted to the operation lever attachment portion 15b arranged on one end side of the cam body 15a.

The curved portion 15b1 of the cam body 15a has first and second side plates 2a provided on the cam support portion 2a2 above the case opening 2a9 when the cam 15 rotates.
It has a function of covering the case opening 2a9 because it is in sliding contact with the case 3 and 2a4.

At the central portion of the cam body 15a, the first and second side plates 2a3, which are inserted into the case opening 2a9 of the cam support portion 2a2 and are provided on the cam support portion 2a2, are provided.
Since the pivots 15a1 and 15a1 (the pivot 15a1 on the rear side in FIG. 1 is not shown in the figure) inserted into the pivot holes 2a7 and 2a8 of 2a4, respectively, are formed.
The cam 15 is rotated in the case opening 2a9 of the cam supporting portion 2a1 by supporting the a1 and 15a1 in the pivot holes 2a7 and 2a8, respectively.

Since the occupant's finger pushes the operating lever 17 to the right or left side in FIG. 1, the cam 15 is pushed to the right side in FIG.
3 to the first position B, one end of each of the first and second movable contact plates 9 and 10 is moved to the second and fifth fixed contact terminals 4 and 7 as shown in FIG. Is electrically connected to the first fixed contact terminal 3 and the second fixed contact terminal 3.
Fixed contact terminal 4 and fourth fixed contact terminal 6
And the fifth fixed contact terminal 7 are electrically connected. Contrary to the above, when the cam 15 is rotated to the second position C by pressing the operating lever 17 to the left side in FIG. 1 by the finger, the first and second movable contact plates 9, 10 The other end of each of the third and sixth fixed contact terminals 5,
8 is electrically connected to the first fixed contact terminal 3
The third fixed contact terminal 5, the fourth fixed contact terminal 6 and the sixth fixed contact terminal 8 are electrically connected.

Then, as shown in FIG. 2, the cam body 15a has a first slide pin accommodating portion 15c and a second slide pin accommodating portion 15c which are cut out in a circular hole shape from the center of the lower end upward. 15d are formed side by side. The first slide pin 11 is pushed into the first slide pin accommodating portion 15c with the first return spring 13 first, and the tip of the first slide pin 11 is inserted into the first movable contact plate 9. Since it is in contact with the central portion, the first return spring 13
The first slide pin 11 presses the first movable contact plate 9 toward the movable contact plate support portions 3a, 3b of the first fixed contact terminal 3 by the elastic repulsive force of the first fixed contact terminal 3. The second return spring 1 is provided in the second slide pin accommodating portion 15d.
4, the second slide pin 12 is pushed in, and the tip of the second slide pin 12 is in contact with the central portion of the second movable contact plate 10, so that the second return spring 14 Second slide pin 1 due to elastic repulsion
2 presses the second movable contact plate 10 toward the movable contact plate support portions 6a and 6b of the fourth fixed contact terminal 6.

The cam body 15a also has a pivot 1
A dust guard 16 is integrally provided on the lower side of 5a1 and 15a1.

The dust guard 16 is provided with a pair of tongues 16a and 16b which are formed in an inverted V shape so as to project from substantially the center of the cam body 15a toward one end of the cam body 15a.

The tongues 16a and 16b are formed in an arc shape concentric with the pivots 15a1 and 15a2 of the cam body 15a, and the third and fourth side plates 2a of the cam support 2a2 are provided.
5, from the upper end side of the 2a6 side facing the cam support portion 2a2
The third and fourth side plates 2a5, 2a6 of the first side, and the width dimension thereof is slightly smaller than the width dimension L2 of the case opening 2a9. And the tongue pieces 16a, 16
On the outer edge of b, a case sliding contact portion 16a1 having a curved shape,
16b1 are formed respectively. Tongues 16a, 16
b is larger than the opening length dimension L1 of the case opening 2a9 in the state before being attached to the case 2 shown in FIG. 4, so that the cam supporting portion is arranged in the case opening 2a9. 2a2 3rd and 4th side plates 2a
5, 2a6 side case sliding contact portions 16a1, 16
b1 has third and fourth side plates 2a on the cam support portion 2a2
5, 2a6 are elastically pressed against the opposing inner edges 2a51, 2a61.

Since the tongues 16a and 16b project up to the upper side of the third and fourth side plates 2a5 and 2a6 of the cam support portion 2a2, the cam 15 as shown in FIG.
Is in the neutral position A, as shown in FIG.
When the cam 5 rotates to the second position B or the cam 3 to the third position C, the cam 15 and the case opening 2
It has the function of closing the gap between it and a9.

Further, since the dust guard 16 is formed integrally with the cam 15 by using a resin which has a slight elastic repulsion force and is hard to be hardened at a low temperature, the dust guard 16 is made of rubber like the conventional one. Compared to grommets, there is no need to assemble a separate grommet on the cam, and
Does not harden at low temperatures, and has tongue pieces 16a, 1
Since 6b has a curved shape concentric with the rotation of the cam 15, the inner edges 2a5 of the third and fourth side plates 2a5, 2a6 which the case sliding contact portions 16a1, 16b1 have on the cam support portion 2a2.
The frictional resistance force when pressed against the first and second a61 is uniform irrespective of the high temperature and the low temperature, and is uniform regardless of the rotational position of the cam 15, whereby the operation lever 1
The operation when pressing 7 is not uncomfortable, and the tongues 16a and 16b are not attached to the cam support portion 2 regardless of whether the cam 15 is in the neutral position A, the first position B, or the second position C.
Since the sliding contact is made with the inner edges 2a51, 2a61 of the third and fourth side plates 2a5, 2a6 provided in a2, the gap between the cam 15 and the case opening 2a9 is always reliably closed.

The seesaw-type switch 1 having such a structure has the first, second, third, fourth, fifth, and sixth fixed contact terminals 3, 4, outside the lower case 2b.
An external circuit such as a power window device is electrically connected to 5, 6, 7, and 8, and the lower case 2b is attached to a door armrest portion of the vehicle.

When the operating lever 17 is pressed to the right side (window closing side) in FIG. 1 by the finger of the occupant, the cam 15 is rotated from the neutral position A to the first position B.
One end of each of the first and second movable contact plates 9 and 10 is electrically connected to the second and fifth fixed contact terminals 4 and 7, so that the first fixed contact terminal 3 and the second fixed contact terminal 3 are fixed. The contact terminal 4, the fourth fixed contact terminal 6 and the fifth fixed contact terminal 7 are electrically connected by a separate circuit, and the current on the window opening side is supplied to the power window motor to drive the window glass to the closing side.

Unlike the above, when the operating lever 17 is pressed to the left side (window opening side) in FIG. 1 by the passenger's finger, the cam 15 is rotated from the neutral position A to the second position C. , The other end of each of the first and second movable contact plates 9 and 10 has third and sixth fixed contact terminals 5,
8 is electrically connected to the first fixed contact terminal 3
And the third fixed contact terminal 5, the fourth fixed contact terminal 6 and the sixth fixed contact terminal 8 are conducted by separate circuits, and the current on the window closing side is supplied to the power window motor to open the window glass. Drive.

Then, when the interior of the vehicle is cleaned with a blow-out type vacuum cleaner which blows off dust by blowing air, or when the interior of the vehicle is cleaned with a suction type vacuum cleaner, the upper portion of the operating lever 17 and the upper Even if dust inside the vehicle, such as the case 2a, flows through the air flow of the vacuum cleaner and reaches between the cam 15 and the case opening 2a9, regardless of the rotational position of the cam 15 (operation lever 17). The curved portion 15b1 of the cam body 15a is slidably in contact with the first and second side plates 2a3, 2a4 of the cam support portion 2a2 above the case opening 2a9 to cover the case opening 2a9 and prevent the cam 15 from moving. Case opening 2a9
Since the tongue pieces 16a and 16b of the dust guard 16 close the gap between the and, the above dust and the like do not enter the case 2, and the pivots 15a1 and 15a2 of the cam 15 are prevented.
Also, dust or the like may be attached to the rotating parts such as the pivot holes 2a7, 2a8 of the upper case 2a, the fixed contact terminals 3, 4, 5, 6, 7, 8 and the movable contact plates 9, 10. There will be nothing.

[0056]

As described above, according to the seesaw-type switch according to the first aspect of the present invention, the cam is attached to the case in order to electrically connect the movable contact plate to the fixed contact terminal. When the cam does not rotate due to the rotation of the cam and the cam is in the off state, the tongue of the cam elastically comes into sliding contact with the upper case on the side where the cam is inclined, so that the gap between the cam and the upper case is closed. Since the tongue piece is not assembled separately from the cam, dust will not enter the part related to the rotation of the cam, and dust may adhere to the movable contact plate or fixed contact terminal. Since it does not exist, the conduction effect does not occur, and as a result, it is possible to improve the quality.

The seesaw-type switch according to claim 2, claim 3, claim 4, claim 5, claim 6, claim 7, claim 8 and claim 9 of the present invention is the same as claim 1. Since it is not necessary to assemble the tongue piece separately from the cam, the productivity related to the assembly can be improved, and the rotation of the cam can be prevented by preventing dust and the like from entering the case. Since dust does not enter into the parts related to and the dust does not adhere to the movable contact plate and fixed contact terminal, conduction failure does not occur, and as a result, quality can be improved. It has an excellent effect.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing a cam in an neutral position in an embodiment of a seesaw switch according to the present invention.

FIG. 2 is a vertical cross-sectional side view around a cam in the seesaw-type switch shown in FIG.

FIG. 3 is a vertical cross-sectional side view of the seesaw-type switch shown in FIG. 1 with a cam in a first position.

FIG. 4 is an external perspective view of each part for explaining an assembling relationship of each part in the seesaw-type switch shown in FIG.

[Explanation of symbols]

 1 Seesaw type switch 2 Case 2a Upper case 2a2 Cam support 2a9 Case opening 2a51 Inner edge 2a61 Inner edge 2b Lower case 3 (Fixed contact terminal) First fixed contact terminal 4 (Fixed contact terminal) Second fixed contact terminal 5 (Fixed contact terminal) Third fixed contact terminal 6 (Fixed contact terminal) Fourth fixed contact terminal 7 (Fixed contact terminal) Fifth fixed contact terminal 8 (Fixed contact terminal) Sixth fixed contact terminal 9 (Movable) Contact plate) first movable contact plate 10 (movable contact plate) second movable contact plate 11 (slide pin) first slide pin 12 (slide pin) second slide pin 13 (return spring) first return Spring 14 (return spring) Second return spring 15 Arm 15a cam body 15b operating lever mounting portion 15b1 curved portion 16 dust guard 16a tongue 16a1 case sliding surface 16b tongue 16b1 case sliding surface 17 lever

Claims (9)

[Claims] 1. A case formed integrally with an upper case and a lower case, wherein the upper case includes a cam support portion, a case opening having a predetermined opening length, and a case housed in the case. A plurality of fixed contact terminals, a movable contact plate rotatably arranged on the fixed contact terminal in a seesaw manner and electrically connectable to any of the fixed contact terminals, and an upper case of the case. A seesaw-type switch, which is disposed so as to penetrate through a case opening and is rotatably supported by a cam support portion of an upper case, and includes a cam capable of pressing the movable contact plate against the fixed contact terminal, The cam can be elastically slidably contacted with the upper case on the side where the cam is inclined to close the gap between the cam and the upper case. Seesaw switch ability tongue piece is characterized in that it is formed integrally. 2. A case support portion rotatably supported by a cam support portion of an upper case is formed on the cam, and
The seesaw-type switch according to claim 1, wherein the tongue piece is formed in a convex shape that is concentric with the case support portion of the cam and has an arc shape. 3. The seesaw-type switch according to claim 2, wherein the tongue piece of the cam has a case sliding contact surface which is a sliding contact surface with the upper case formed in an arc shape. 4. The tongue piece of the cam is extended in a cantilever manner, and the case sliding contact surface of the tongue piece is formed to have an outer diameter dimension slightly larger than the opening length of the case opening portion of the upper case. The seesaw-type switch according to claim 3, wherein: 5. A case, a plurality of fixed contact terminals housed in the case, a seesaw-like rotatable arrangement on the fixed contact terminal, and electrically connected to any of the fixed contact terminals. A movable contact plate, a cam rotatably attached to the case, and arranged so that the movable contact plate can be pressed against a fixed contact terminal; And a case opening having a predetermined opening length on the inclined side of the rotating cam, and a case formed integrally with the cam on the inclined side of the cam arranged in the case opening. Seesaw type, characterized in that it is provided with a dust guard having a pair of tongues capable of elastically sliding contact with each other and closing a gap between the cam and the case opening. Switch. 6. The case includes a lower case to which a fixed contact terminal is fixed, and an upper case assembled to the lower case. The case is formed in a rectangular tubular shape so as to project from the upper case. A case opening is formed inside the cam support that rotatably supports, with an opening width slightly larger than the width of the cam, and the tongue on the dust guard is inside the case opening. The seesaw-type switch according to claim 5, wherein the seesaw-type switch protrudes from the cam body disposed in the direction toward the inner edge of the case opening on the opening length direction side. 7. The dust guard has a tongue piece in an arc shape concentric with the rotation center of the cam, and has a width dimension substantially equal to the opening width of the case opening portion and insertable into the case opening portion. At the same time, the size of the tongue protruding from the cam body is
The seesaw-type switch according to claim 6, wherein the cam has a size that allows the cam to project from the case opening when the cam is rotated to a rotation end on the upper case. 8. The cam has, in the cam body, an operation lever attached to one end side disposed outside the case, and a movable contact via a return spring to the other end side disposed inside the case. A slide pin that can elastically press the plate is housed in the dust guard, on the outside of the tongue protruding toward one end of the cam body, and on the inside of the case opening in the opening length direction side. The seesaw-type switch according to claim 7, wherein a case sliding contact surface capable of sliding contact with the edge is formed. 9. The cam main body of the cam has, on one end side thereof, a curved portion which is concentric with the rotation center of the cam and which is curved so as to cover above the case opening, 9. The seesaw-type switch according to claim 8, wherein the cam support portion is provided with an operation lever attachment portion capable of sliding contact, and the tongue piece included in the dust guard is arranged inside the operation lever attachment portion.