JP3244590B2 - Switch device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for mounting a rubber sheet member having movable contacts on a circuit board having fixed contacts.
The present invention relates to a switch device in which these contacts are switched by operating an operation body exposed from an opening of a housing, and more particularly to a waterproof structure for preventing moisture that has entered the inside of a housing from reaching a contact portion.

[0002]

2. Description of the Related Art FIG. 3 is a sectional view showing an example of a waterproof structure provided in a conventional switch device. The switch device shown in FIG. 1 has a housing 1 having an outer shell and having a column 1a protruding inward, a circuit board 3 housed in the housing 1, and a circuit board 3 mounted on the circuit board 3. Prop part 1
sheet member 4 having a cylindrical projection 4a surrounding a
And a screw member 5 that penetrates the through hole 3a of the circuit board 3 and is screwed to the column 1a. Although not shown, an operating body is provided on the housing 1 so as to be swingable about a support shaft, and a part of the operating body is exposed through an opening 2 formed in the housing 1. . The rubber sheet member 4 has a convex portion which is in contact with the lower end of the operation body. A movable contact is provided inside the convex portion, and a fixed contact facing the movable contact is provided on the circuit board 3. Have been. A through-hole 4b is formed in the protrusion 4a of the rubber sheet member 4, and the inner diameter of the through-hole 4b is set to be slightly larger than the outer diameter of the column 1a of the housing 1. .

In the conventional switch device constructed as described above, the screw member 5 is connected to the circuit board 3 with the support 1a of the housing 1 inserted into the through hole 4b of the rubber sheet member 4.
The housing 1 and the circuit board 3 are fastened via the screw member 5 by screwing through the through-hole 3a of the support member 1a and screwing to the column 1a. In use, for example, when water such as rainwater or juice enters the housing 1 through the opening 2, the water is blocked by the peripheral wall of the protrusion 4 a, and thus reaches the circuit board 3 through the through hole 4 b. Water is prevented from entering.

FIG. 4 is a cross-sectional view showing another example of the waterproof structure provided in the conventional switch device, and portions corresponding to FIG. 3 are denoted by the same reference numerals. 3 is different from the switch device shown in FIG. 3 in that a large-diameter portion 1b is provided on the base side of a support portion 1a, and the lower end of the large-diameter portion 1b abuts on the upper end of a protruding portion 4a. The other configuration is the same.

In another conventional switch device configured as described above, the protrusion 4a is clamped between the lower end of the large-diameter portion 1b and the circuit board 3 by the tightening force of the screw member 5. The lower end of the large diameter portion 1b and the protrusion 4
The space between the upper ends of a is sealed. Therefore, moisture entering the housing 1 from the opening 2 and the like is blocked by the peripheral wall of the protrusion 4a, and passes through the through hole 4b by sealing the lower end of the large diameter portion 1b and the upper end of the protrusion 4a. Thus, it does not penetrate into the circuit board 3 and the waterproof property is further enhanced.

[0006]

However, in the switch device shown in FIG. 3 described above, the inner diameter of the through hole 4b of the rubber sheet member 4 is set to be somewhat larger than the outer diameter of the column 1a of the housing 1. By doing so, the support portion 1a can be easily inserted into the protrusion 4a of the rubber sheet member 4 during the assembling work, so that a gap of a predetermined size needs to be formed between the support portion 1a and the protrusion 4a. There is.
Accordingly, there is a concern that moisture may enter the circuit board 3 through the gap, and the waterproof property is insufficient.

On the other hand, in the other switch device shown in FIG. 4 described above, a high waterproof property can be ensured by sealing between the lower end of the large diameter portion 1b and the upper end of the protruding portion 4a. Since it is necessary to provide a large-diameter portion 1b that is partially thicker on the root side of 1a, when the housing 1 is formed, a so-called “G” portion located above the large-diameter portion 1b is formed on the surface of the housing 1 in the G portion. There is a problem that sinks occur and the appearance of the housing 1 is impaired.

Further, in both of these switch devices, it is necessary to integrally form a cylindrical projection 4a having a through hole 4b with the rubber sheet member 4, and the rubber sheet member 4 having such a shape is usually required. In the molding process, a predetermined amount of rubber material is filled in the cavity between the upper mold and the lower mold, and pressure is applied.Therefore, it is necessary to remove burrs that have protruded from the parting part after molding. There was also a problem that the work was costly and expensive.

SUMMARY OF THE INVENTION The present invention has been made in view of such a situation of the prior art, and an object of the present invention is to provide a switch device having high waterproofness and low cost.

[0010]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a housing having a pillar portion projecting inward, a circuit board housed in the housing and having fixed contacts, and a circuit board mounted on the circuit board. A rubber sheet member having a movable contact, and an operating body exposed from an opening formed in the housing to bring the movable contact into contact with the fixed contact, wherein the housing and the circuit board are provided with the circuit. in the switch device which is integrated with the substrate through by a screw member screwed into the struts, the tip of the struts to the rubber sheet member provided thin portion abuts, the times
The screw member penetrating the circuit board breaks through the thin portion.
Te by screwing to the struts, is accomplished by nipping said thin portion between said supporting column portion and the circuit board.

[0011]

The screw member penetrates the circuit board and breaks through the thin portion of the rubber sheet member and is screwed to the support column of the housing.
By, integrating the housing and the circuit board while clamping the thin portion between the lower surface and the circuit board struts
Then, the thin portion of the rubber sheet member functions as a packing, and the space between the thin portion and the support portion is sealed, so that the water that has entered the housing is prevented from reaching the surface of the circuit board. Here, since the pillar portion of the housing can be formed in a straight shape without having to provide a large diameter portion on the root side thereof, the housing does not become thick at this portion. Occurrence of sinks can be prevented at times. Further, since it is not necessary to provide a cylindrical projection on the rubber sheet member, no burrs are generated during molding, and the processing cost of the rubber sheet member can be reduced. Further, since the screw member penetrates through the thin portion of the rubber sheet member and is screwed to the support portion, the thin portion can be easily pierced by the screw member during assembly without forming a through hole in the thin portion in advance. The cost can be reduced from this point.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of a switch device according to an embodiment of the present invention, and FIG. 2 is an exploded cross-sectional view showing a main part of FIG.
In these figures, parts corresponding to FIGS. 3 and 4 are denoted by the same reference numerals. That is, 1 is a housing, 1a is a column, 2 is an opening, 3 is a circuit board, 3a is a through hole,
Is a screw member.

The switching device according to the present embodiment is described with reference to FIGS.
4 is different from the conventional switch device shown in FIG. 4 in that a thin portion 7 is provided in a part of the rubber sheet member 4 placed on the circuit board 3 and the screw member 5 is connected to the through-hole 3a of the circuit board 3 with the through hole 3a. The thin portion 7 is screwed into the column 1a of the housing 1 through the thin portion 7, and the thin portion 7 is sandwiched between the lower surface of the column 1a and the circuit board 3; Is the same as As shown in FIG. 2, the thin portion 7 is set to be thinner than other portions, for example, about 0.2 mm. The thin portion 7 is formed in advance at the time of molding the rubber sheet member 4 and will be described later. A through hole 7a is formed by piercing with the screw member 5 during assembly. The housing 1 is formed of, for example, an ABS resin or the like.
Assuming that the radial thickness of a is T2, T2 is 0.8 of T1.
It is set to be less than or equal to twice (that is, 0.8T1 ≧ T2).

An operating body 11 is supported on the housing 1 by a support shaft 6.
The operation body 11 is provided so as to be swingable about
Is exposed through an opening 2 formed in the housing 1, and a pressing portion 12 is provided on a lower surface thereof.
The pressing portion 1 of the operation body 11 is provided on the rubber sheet member 4.
The movable contact 10 is provided inside the convex 9, and the fixed contact 8 facing the movable contact 10 is provided on the circuit board 3.

When assembling the switch device thus constructed, the rubber sheet member 4 is placed on the circuit board 3 and the thin portion 7 of the rubber sheet member 4 is attached to the housing 1.
When the screw member 5 passes through the through hole 3a of the circuit board 3 and is screwed into the support portion 1a in a state where the screw member 5 is in contact with the support portion 1a, the screw member 5 breaks through the thin portion 7 to form the thin portion 7. A through hole 7a is formed, and the housing 1, the circuit board 3 and the rubber sheet member 4 are fastened via the screw member 5. As a result, the thin portion 7 is sandwiched between the lower surface of the support portion 1a and the upper surface of the circuit board 3, so that the elasticity of the thin portion 7 itself functions as packing, and the space between the support portion 1a and the circuit board 3 is sealed. Is done.

When one of the upper ends of the operating body 11 is pressed, the switch device thus assembled
Since the operating body 11 swings in a seesaw shape about the support shaft 6 and the convex portion 9 of the rubber sheet member 4 located on the pressing side is pressed by the pressing portion 12, the convex portion 9 is buckled. As a result, a click feeling is generated, and the movable contact 10 comes into contact with the fixed contact 8 to be turned on. When the pressing force on the operating body 11 is removed, the downward side of the operating body 11 is pushed up via the pressing portion 12 by the resilience of the convex portion 9 of the rubber sheet member 4. Numeral 11 returns to the initial state shown in FIG. 1, and as a result, the movable contact 10 which has been in the contact state is separated from the fixed contact 8 to be turned off. In such use, even if water such as rainwater or juice enters the housing 1 through the opening 2, for example, the space between the thin portion 7 and the support portion 1a is sealed by the elasticity of the thin portion 7 itself. Therefore, the moisture is reliably prevented by the rubber sheet member 4, and the intrusion of moisture to the contact portions (the fixed contact 8 and the movable contact 10) is prevented.

In the above embodiment, the space between the thin portion 7 of the rubber sheet member 4 and the column 1a of the housing 1 is sealed by the elasticity of the thin portion 7 itself.
Moisture that has invaded the inside of the device can be reliably prevented by the rubber sheet member 4, and a short circuit between the fixed contact 8 and the movable contact 10 can be prevented. In addition, the column 1a of the housing 1
Since it is not necessary to provide a large-diameter portion on the base side and can be formed in a straight shape, the housing 1 does not have a thick-walled shape at this portion. Can be prevented. Further, the rubber sheet member 4 has a simple shape, and there is no need to provide a cylindrical projection that generates burrs. Therefore, the processing cost of the rubber sheet member 4 can be reduced. Furthermore, since the through-hole 7a can be easily formed in the thin portion 7 by piercing the thin portion 7 with the screw member 5, the thin portion 7 is formed when the rubber sheet member 4 is formed.
It is not necessary to form the through-holes 7a at the same time, and the cost can be reduced from this point as well.

[0018]

[0019] In the above embodiment has been described switch device seesaw type switching is performed by the swing operation of operation body 11, the control mode of the operation body 11 is not limited to this, the pushing operation of the operation body Similar effects can be obtained for a push-type switch device in which switching is performed.

[0020]

As described above, according to the present invention,
A thin portion is formed in advance on a rubber sheet member placed on a circuit board, and a screw member penetrates the circuit board and breaks through the thin portion and is screwed into a support post portion of the housing, so that these post portions and the circuit are formed. clamping state thin portions in the substrate
Because the housing and the circuit board are integrated with each other, the thin part functions as a packing, sealing between the support and the circuit board, and ensuring that moisture that has entered the housing reaches the surface of the circuit board. Can be prevented. Further, since sink marks can be prevented from being generated in the vicinity of the column during molding of the housing, the surface of the housing can be finished smoothly, and a housing having a good appearance can be obtained. Furthermore, it is not necessary to provide a cylindrical protrusion on the rubber sheet member, the burr is not generated at the time of molding, deer
Also, without forming a through hole in the thin part of the rubber sheet member
Also easily breaks through thin parts with screw members during assembly
It can be reduced machining cost of the rubber sheet member.

[Brief description of the drawings]

FIG. 1 is a sectional view of a switch device according to an embodiment of the present invention.

FIG. 2 is an exploded sectional view showing a main part of FIG.

FIG. 3 is a cross-sectional view illustrating an example of a conventional switch device.

FIG. 4 is a cross-sectional view showing another example of a conventional switch device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 1a Prop part 2 Housing 3 Circuit board 4 Rubber sheet member 5 Screw member 7 Thin part 7a Through hole 8 Fixed contact 9 Convex part 10 Movable contact 11 Operating body

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01H 23/30 H01H 9/04 H01H 13/06 H01H 13/70

Claims (1)

(57) [Claims] A housing having a support portion protruding inward; a circuit board housed in the housing and having fixed contacts; a rubber sheet member mounted on the circuit board and having movable contacts; An operating body that is exposed from an opening formed in the housing and makes the movable contact come into contact with the fixed contact, wherein the housing and the circuit board are screwed into the support through the circuit board. In the switch device integrated by a screw member, a thin portion is provided on the rubber sheet member so that a tip of the support portion abuts, and the screw member penetrating the circuit board is the thin portion.
The pierce through by screwing to the support column portion, the switch device characterized by nipping the thin portion between said supporting column portion and the circuit board.