JP2000067684A - Push button switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive switch with a small number of pieces of components and superior in the operability feeling by disposing a press part in a recess, inserting an operating part into a hole of a water-proof member to be projected to the outside of a housing, and bringing in elastically pressing state into contact an inner peripheral end surface of the hole of the water-proof member with the operating part, and an outer peripheral end surface of the water-proof member with an inner wall of the recess. SOLUTION: When an operating part 5a is pressed, a press part 5c directly presses a dome-shaped movable contact 4, and the movable contact 4 is reversed so that its backside is contacted with a contact part 2a of a first fixed contact 2. The first fixed contact 2 and a second fixed contact 3 are continued by the movable contact to be switched on. An inner peripheral end surface of a hole 6a of a water-proof member 6 is brought in elastically pressing state into contact with an operating part 5, its outer peripheral end surface with an inner wall of a recess 1c of a housing 1, the inner peripheral end surface of the hole 6a of the water-proof member 6 at the operating part 5a side is elastically deformed so that it is hanged down, but its sealing is retained in the operation. When the pressing force of the operating part 5a is released, the switch is turned off by the reversed return of the movable contact 4, and the operating part 5a is returned to the original position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a push button switch and, more particularly, to a waterproof push button switch.

[0002]

2. Description of the Related Art A conventional push button switch will be described with reference to the drawings. FIG. 3 is a front view showing a conventional push button switch, FIG. 4 is a plan view showing a conventional push button switch, and FIG.
FIG. 2 is a sectional view showing a conventional push button switch.

As shown in FIGS. 3 to 5, the first housing 10 is formed into a substantially rectangular shape by molding and processing an insulating synthetic resin material, and includes a side wall 10a surrounding four sides, a bottom wall 10b, and a center of the upper surface. And a circular concave portion 10c. A groove 10d having a wide width and a predetermined depth dimension is formed on the upper surface of each side wall 10a, and each of the corners 1 on the upper surface of the side wall 10a.
In 0e, four cylindrical protrusions 10f projecting upward are formed.

The first fixed contact 11 is formed in a substantially L-shape by cutting and bending a flat metal plate.
And a terminal portion 11b. Then, the first fixed contact 11 is insert-molded in the first housing 10,
The contact portion 11a is disposed in a state where the surface is exposed at the center of the concave portion 10c of the first housing 10, and the terminal portion 11b
Are provided so as to protrude downward from the side surface of one side wall 10a of the first housing 10 along the side wall 10a.
The first fixed contact 11 insert-molded in the first housing 10 is provided in the first housing 10.

The second fixed contact 12 is formed into a substantially L-shape by cutting and bending a metal plate, and has a contact portion 12a and a terminal portion 12b. Then, the second fixed contact 12 is insert-molded in the first housing 10,
The contact portion 12a is close to the inner peripheral edge of the concave portion 10c so as to sandwich the contact portion 11a of the first fixed contact 11 provided with the surface exposed at the center of the concave portion 10c of the first housing 10, In addition, the terminal portion 12b is disposed with the surface exposed, and the terminal portion 12b is disposed to protrude downward from the side wall of the first housing 10 along the side wall.

As described above, the first housing 10, the first fixed contact 11, and the second fixed contact 12 are integrated because the first and second fixed contacts 11, 12 are insert-molded in the first housing 10. And constitute one component.

The movable contact 13 is formed in a dome shape by cutting and extruding an elastic metal flat plate. The movable contact 13 is disposed in the recess 10 c of the first housing 10, the peripheral edge of the movable contact 13 contacts the contact portion 12 a of the second fixed contact 12, and the movable contact 13 is connected to the first fixed contact 12. The contact 11 is arranged so as to cover the contact portion 11a.

The first stem 14 is formed by processing an insulating synthetic resin material and is substantially disk-shaped. The first stem 14 has a small-diameter portion 14a, a large-diameter portion 14b connected below the small-diameter portion 14a, and a large-diameter portion 14a.
and a pressing portion 14c protruding downward from b. The first stem 14 is arranged in a state where the pressing portion 14c is in contact with the top of the dome-shaped movable contact 13.

The insulator 15 is made of a sheet-like material such as a polyimide resin material, and is formed in a substantially cross shape. The insulator 15 is placed in the groove 10d on the upper surface of the side wall 10a of the first housing 10,
In addition, it is arranged so as to close the recess 10 c and abut on the upper surface of the small diameter portion 14 a of the first stem 14.

The waterproof member 16 is made of a sheet-like rubber material (for example, EPDM material) and is formed in a substantially cross shape. The waterproof member 16 is placed in the groove 10 d on the upper surface of the side wall 10 a of the first housing 10 so as to overlap the insulator 15.

The second housing 17 is formed into a substantially rectangular shape by molding and processing an insulating synthetic resin material, and the side wall 17 surrounding the four sides is formed.
a and an upper wall 17b connected to the side wall 17a. In the center of the upper wall 17b, a circular small hole 17 is formed.
c is formed, and a circular large-diameter hole 17d is formed below the small-diameter hole 17c. At four corners of the upper wall 17b, including the side walls 17a, arc-shaped notches 17e are provided.
Are provided up to the vicinity of the lower surface of the side wall 17a, and pedestals 17g are formed at the four corners of the lower end portion.
Each of the four holes 17f penetrated in the vertical direction is provided.

The second housing 17 is arranged such that the lower surface of the side wall 17a is in contact with the upper surface of the waterproof member 16. In this state, the convex portion 10f of the first housing 10 is inserted into the hole 17f, and The tip protrudes upward from the hole 17f. The tip of the projection 10f projecting upward from the hole 17f is caulked by, for example, thermal caulking, and the second housing 17 is fixed to the first housing 10 by the caulking and integrated.

The second stem 18 is formed by molding and processing an insulating synthetic resin material, and has a columnar operation portion 18a, a flange portion 18b provided at a lower end of the operation portion 18a, and protrudes below the flange portion 18b. And a pressing portion 18c provided. Further, the pressing portion 18c has a columnar convex portion 18d, and three support portions 18e arranged at an angle of, for example, 120 degrees on the side of the convex portion 18d.

The second stem 18 has a pressing portion 18c,
In a state of being housed in the large-diameter hole 17d of the second housing 17, the operating portion 18a protrudes outward (upward) through the small-diameter hole 17c, and the upper surface of the flange portion 18b contacts the upper wall 17b. The second stem 18 is arranged so as not to come off from the second housing 17.

In this state, the distal end surface (lower surface) of the projection 18 d of the second stem 18 is in contact with and disposed on the upper surface of the waterproof member 16.

Next, the operation of the conventional push button switch will be described. When the operation portion 18a of the second stem 18 is pressed downward, the push button switch
8 d presses substantially the center of the waterproof member 16 and the insulator 15 downward. When the insulator 15 is pressed downward, the first stem 14 in contact with the insulator 15 is pressed downward. This pressing causes the pressing portion 14c of the first stem 14 to move the dome-shaped movable contact 1
Press 3 down. When the movable contact 13 is pressed, the movable contact 13 is inverted and the back surface of the movable contact 13 is moved to the first position.
The fixed contact 11 contacts the contact portion 11a. By contact with the contact portion 11a, the first fixed contact 11 and the second fixed contact 12 are conducted through the movable contact 3, and the push button switch is turned on.

From this state, the operating section 1 of the second stem 18
When the downward pressing force of 8 a is released, the pressing portion 14 c of the first stem 14 is pushed upward by the reversing return force of the dome-shaped movable contact 13. At this time, the movable contact 1
3 is separated from the first fixed contact 11, and this push button switch is turned off. Thereafter, the operation described above is performed in the reverse order, and the operation portion 18a of the second stem 18 returns to the original position. In this way, by pressing the movable contact 13 via the second stem 18 and the first stem 14 and the like, a click operation is caused and a continuous operation can be repeated.

Next, the assembly of the first housing 10 and the second housing 17 of the conventional push button switch will be described. First, with the insulator 15 and the waterproof member 16 placed on the upper surface of the side wall 10 a of the first housing 10, the hole 17 f of the second housing 17 is inserted into the projection 10 f of the first housing 10. In this state, the protrusion 10f
Is deformed by, for example, thermal caulking, and the first housing 10 and the second housing 17 are integrated by the pressing deformation of the projection 10f.

[0019]

As described above, in the conventional push button switch, the components thereof are the first and second housings 10 and 17, the first and second stems 14 and 18, the movable contact 13, , The insulator 15 and the waterproof member 16, and the push-button switch composed of these seven parts requires a lot of man-hours for processing each part and for assembling them. Therefore, there is a problem that the push button switch becomes expensive.

Further, in the conventional push button switch, since the sheet-like insulator 15 and the waterproof member 16 are arranged, the pressing portion 18c of the second stem 18 is interposed between the insulator 15 and the waterproof member 16. The dome-shaped movable contact 13 is pressed. As a result, a click feeling caused by the reversing operation of the dome-shaped movable contact 13 is absorbed by the waterproof member 16, and there is a problem that a good operation feeling accompanying the ON / OFF operation of the push button switch cannot be obtained.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a push button switch which has a small number of parts, is inexpensive, and has a good operational feeling.

[0022]

According to the present invention, there is provided a push button switch comprising: a housing having a concave portion; a fixed contact disposed in the concave portion of the housing; and a fixed contact disposed in the concave portion and disposed above the fixed contact. Movable contact, a lid attached to the housing so as to cover the upper part of the concave portion, a waterproof member provided on the lower surface of the lid in the concave portion, a pressing portion for pressing the movable contact, and an operation A movable stem having a portion, a pressing portion is disposed in the concave portion, and the operating portion is inserted into the hole of the waterproof member to protrude out of the housing, and the inner peripheral end face of the hole of the waterproof member is operated. That is, the outer peripheral end surface of the waterproof member is brought into close contact with the inner wall of the recess in an elastic pressure state.

Further, in the push button switch according to the present invention, the waterproof member is formed of a rubber material.

In the push button switch according to the present invention, the stem is provided with a flange on the operating portion, and the waterproof member and the flange are in close contact with each other when the stem is not operated.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A push button switch according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view showing a push button switch according to an embodiment of the present invention.
1 is a sectional view showing a push button switch according to an embodiment of the present invention.

As shown in FIGS. 1 and 2, the housing 1
Is formed into a substantially rectangular shape by molding an insulating synthetic resin material, and has a side wall 1a surrounding four sides and a bottom wall 1 connected to the side wall 1a.
b, a substantially circular recess 1c provided at the center on the upper surface side
And In addition, a plurality of (for example, four) columnar projections 1e protruding upward are provided at the four corners of the upper surface of each side wall 1a.

The first fixed contact 2 is made of a flat metal material, is formed by cutting and bending, is substantially L-shaped, and has a contact portion 2a and a terminal portion 2b. The first fixed contact 2 is insert-molded in the housing 1, the contact portion 2a is disposed in a state where the surface is exposed substantially at the center of the bottom surface of the concave portion 1c, and the terminal portion 2b is connected to one of the housings 1. Is provided so as to protrude downward along the side wall 1a.

The second fixed contact 3 is made of a flat metal material, is formed by cutting and bending, is substantially L-shaped, and has a contact portion 3a and a terminal portion 3b. The second fixed contact 3 is insert-molded in the housing 1, the contact portion 3 a is disposed with the surface exposed at the bottom surface of the concave portion 1 c, and the terminal portion 3 b is provided on one side wall 1 a of the housing 1. It is arranged to protrude downward along. That is, the pair of contact portions 3 a are arranged at positions sandwiching the contact portion 2 a of the first fixed contact 2. At this time, the second
Terminal part 3b of fixed contact 3 and terminal part 2b of first fixed contact 2
Is disposed so as to protrude downward along each of the opposed side walls 1a.

In this state, the housing 1, the first fixed contact 2, and the second fixed contact 3 are connected to the first and second fixed contacts 2,
3 is integrated with the first housing 1 because it is insert-molded to form one part.

The movable contact 4 is formed in a dome shape by cutting and extruding (pressing) an elastic metal plate such as a phosphor bronze material. The movable contact 4 is disposed in the concave portion 1c of the housing 1, and the periphery of the movable contact 4 is
The movable contact 3 is disposed so as to be in contact with the surface of the contact portion 3a of the second fixed contact 3 and the movable contact 3 is disposed above the contact portion 2a of the first fixed contact 2 so as to cover the contact portion 2a. Have been.

The stem 5 is formed by processing a synthetic resin material.
It is substantially disk-shaped, and has an operation portion 5a, a lower end of the operation portion 5a, a flange portion 5b formed in a direction orthogonal to an outer peripheral surface of the operation portion 5a, and protrudes downward from a lower surface of the flange portion 5b. And a pressing portion 5c. The lower end surface of the pressing portion 5c is
It is formed in an arc shape. The stem 5 is arranged in a state where the pressing portion 5c is in contact with the apex of the dome-shaped movable contact 4, so that the pressing portion 5c and the flange portion 5b are
In the recess 1c. Further, the stem 5 is arranged so as to be able to move up and down in the recess 1c.

The waterproof member 6 is made of a resilient rubber material (for example, EPDM material) or the like, has a flat, substantially annular shape, and has a circular hole 6a. The diameter of the hole 6a is larger than the outer diameter of the operating portion 5a of the stem 5.
The outer diameter of the waterproof member 6 is slightly larger than the inner diameter of the concave portion 1 c of the housing 1. This waterproof member 6
The waterproof member 6 is tightly fitted on the flange 5b while being inserted while being pressed against the operating portion 5a of the stem 5, and the waterproof member 6
It is arranged at the upper end in c.

That is, the operating portion 5a of the stem 5 is
Through the hole 6a of the housing 1 so as to protrude out of the housing 1. The inner peripheral end face of the hole 6a of the waterproof member 6 is brought into close contact with the operation portion 5a in a resilient state, and the outer peripheral end face of the waterproof member 6 is It is arrange | positioned so that it may contact with the inner wall of the recessed part 1c in a resilient state.

The lid 7 is formed by processing an insulating synthetic resin material to form a flat rectangular shape, and has a circular insertion hole 7a provided at the center and four holes 7b provided at four corners. have. In addition, a stem 5 is inserted into the insertion hole 7a of the lid portion 7.
The operation unit 5a is inserted, the operation unit 5a projects upward,
With the protrusion 1e of the housing 1 inserted into each of the four holes 7b, the tip of the protrusion 1e is pressed and deformed by thermal caulking or the like, thereby integrating the housing 1 with the lid 7. . In this state, that is, when the stem 5 is not operated, the waterproof member 6 is sandwiched and tightly arranged between the lid 7 and the flange 5b of the stem 5.

As described above, the components of the push button switch according to the embodiment of the present invention include the housing 1, the movable contact 4,
It is composed of five parts: a stem 5, a waterproof member 6, and a lid 7.

Next, the operation of the push button switch of the present invention will be described. This push-button switch is operated by the operation unit 5 of the stem 5.
When a is pressed downward, the pressing portion 5c of the stem 5 directly presses the dome-shaped movable contact 4 downward. When the movable contact 4 is pressed, the movable contact 4 is inverted against the elasticity, and the back surface of the movable contact 4 comes into contact with the contact portion 2 a of the first fixed contact 2. In this way, the first fixed contact 2 and the second fixed contact 3 are conducted by the movable contact 3, and the push button switch is turned on.

In this state, the waterproof member 6 pressed against the outer peripheral surface of the operating portion 5a of the stem 5 is elastically deformed so that the inner peripheral end surface of the hole 6a of the waterproof member 6 hangs downward. 6 does not separate from the outer peripheral surface of the operation portion 5a, and the hermeticity of the concave portion 1c of the housing 1 is maintained.

Here, when the downward pressing force of the operating portion 5a of the stem 5 is released from this state, the pressing portion 5c of the stem 5 is pushed upward by the reversing return force of the dome-shaped movable contact 4. At this time, the movable contact 4 is separated from the first fixed contact 2 and the push button switch is turned off, and the operation section 5a of the stem 5 returns to the original position. In this way, by directly pressing the movable contact 4 with the stem 5, the click operation can be performed lightly and the continuous operation can be repeated.

In the above-described embodiment, the fixed contacts are the first and second fixed contacts, and one fixed contact is always in contact with the movable contact. However, the present invention is not limited to this. When both of the first and second fixed contacts are off, a configuration in which they are separated from the movable contact may be adopted.

In the above-described embodiment, the housing is formed in a rectangular shape. However, the present invention is not limited to this. In the above-described embodiment, the flange is formed on the operating portion of the stem. However, the present invention is not limited to this, and the flange may not be formed.

[0041]

As described above, the push button switch of the present invention is
Since the housing, the movable contact, the stem, the waterproof member, and the lid are composed of five parts, the number of parts is smaller than that of a conventional push button switch, so that it is easy to assemble and inexpensive. An effect is provided that a push button switch can be provided.

In the push button switch according to the present invention, the movement of the stem having the pressing portion for pressing the movable contact and the operating portion allows the pressing portion to pass through the waterproof member arranged in the conventional push button switch. Since the movable contact is directly pressed, the click feeling due to the inversion of the movable contact is directly transmitted to the operation unit, so that a good click feeling can be obtained.

Further, the push button switch of the present invention can provide an inexpensive push button switch because the waterproof material is formed of a rubber material, and the rubber material is inexpensive and has good workability. I can do it.

Further, in the push button switch of the present invention, the flange is provided on the operation portion, and when the stem is not operated, the waterproof member and the flange are in close contact with each other. Since the switch is held, a push-button switch having a stable operation can be provided.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a push button switch according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a push button switch according to the embodiment of the present invention.

FIG. 3 is a front view showing a conventional push button switch.

FIG. 4 is a plan view showing a conventional push button switch.

FIG. 5 is a sectional view showing a conventional push button switch.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 1a Side wall 1c recess 2 First fixed contact 2a Contact part 3 Second fixed contact 3a Contact part 4 Movable contact 5 Stem 5a Operating part 5c Pressing part 6 Waterproof member 7 Lid

Claims (3)

[Claims] 1. A housing having a recess, a fixed contact disposed in the recess of the housing, a movable contact disposed in the recess and disposed above the fixed contact, and the recess. A cover attached to the housing so as to cover an upper part of the housing, a waterproof member provided on a lower surface of the cover in the recess, a pressing part for pressing the movable contact, and an operating part. A movable stem, wherein the pressing portion is disposed in the concave portion, and the operating portion is inserted into a hole of the waterproof member so as to protrude outside the housing, and an inner periphery of the hole of the waterproof member is provided. A push button switch, wherein an end face is brought into close contact with the operation portion in a resilient state, and an outer peripheral end face of the waterproof member is brought into close contact with the inner wall of the recess in a resilient state. 2. The push-button switch according to claim 1, wherein said waterproof member is formed of a rubber material. 3. The stem according to claim 1, wherein a flange portion is provided on the operating portion, and the waterproof member and the flange portion are in close contact with each other when the stem is not operated.
Pushbutton switch as described.