JPH0511243U - Switch device - Google Patents

Abstract

(57) [Abstract] [Purpose] In a switch device in which a switch body and a knob are sealed by a sheet in a case, it is possible to prevent a defective return of the knob and a deterioration of a knob operation feeling. [Structure] The case 11 is provided with a storage portion 12, and the storage portion 12
The switch main body 17 and the knob 22 for pressing the switch main body 17 are provided. A sheet 25 is adhered to the upper surface of the case 11 with an adhesive 26 so as to cover the knob 22, and the housing 12 is sealed. By connecting the bellows 27 to the communication hole 16 via the pipe 28, the inside of the storage portion 12 and the inside of the bellows 27 are made to communicate with each other, and a change in pressure inside the storage portion 12 due to a change in ambient temperature is detected by the bellows 27. Is adjusted by expanding and contracting so that the pressure applied to the seat 25 is reduced.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a so-called waterproof type switch device in which a switch body and a knob are sealed with a sheet in a case.

[0002]

[Prior Art]

 Conventionally, in this type of switch device, as shown in, for example, FIG. 3, a switch body 3 and a knob 4 for pressing the switch body 3 are provided in a housing 2 provided in the case 1, and the surface of the case 1 is In addition, there is a sheet which is covered with the knob 4 and has a sheet 5 adhered so as to hermetically seal the storage portion 2 so as to have a waterproof property.

In this structure, the switch body 3 is turned on and off by pressing the knob 4 via the seat 5.

[0004]

[Problems to be solved by the device]

 However, in the related art, since the storage portion 2 is hermetically sealed, the pressure inside the storage portion 2 changes due to the ambient temperature change.

For this reason, for example, when the pressure in the storage unit 2 becomes abnormally high, a large pressure acts on the seat 5, and the air in the storage unit 2 slightly causes the air in the storage unit 2 to adhere to the bonded portion. In this state, the seat 5 covering the knob 4 is pushed to the outside air pressure by leaking out and reducing the amount of air in the storage unit 2, and conversely, the pressure in the storage unit 2 decreases. There were cases where it was dented, making it difficult to return the knob 4 to its original position, or making the operation feeling of the knob 4 worse.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a switch device capable of preventing defective return of a knob and deterioration of operation feeling of the knob as much as possible.

[0007]

[Means for Solving the Problems]

 The switch device of the present invention comprises a case having a storage part, a switch main body disposed in the storage part, a knob for operating the switch main body, and a knob for covering the knob and sealing the storage part. A flexible sheet provided in the case is characterized in that it is provided with a pressure adjusting means that is in communication with the storage section and that changes an internal capacity according to a change in internal pressure.

[0008]

[Action]

 The pressure in the storage unit changes as the ambient temperature changes, but the pressure in the storage unit is adjusted based on the change in the internal capacity of the pressure adjusting means, so the pressure change in the storage unit is reduced. To be done. Therefore, the pressure acting on the seat due to the pressure change in the storage portion is reduced.

[0009]

【Example】

 Hereinafter, a first embodiment of the present invention will be described with reference to FIG. A storage unit 12 is formed in the case 11. The housing portion 12 has a first recess 13 formed in the lower portion of the case 11 so that the lower surface side is open, an insertion hole 14 formed in communication with the first recess 13, and an upper surface of the case 11. A second concave portion 15 is formed in the portion in communication with the insertion hole 14 and has an open upper surface. In addition, an L-shaped communication hole 16 is formed in the left portion of the case 11 so as to communicate with the second recess 15 of the storage portion 12.

A switch body 17 is disposed in the first recess 13 of the storage section 12. The switch body 17 has a movable part 18 having a movable contact (not shown) and urged upward, a container 19 provided to allow the movable part 18 to move up and down, and a fixed contact (not shown). And a substrate 20 having a substrate 20. The substrate 20 is arranged so as to close the lower surface opening of the first recess 13. A sealing resin 21 is provided on the lower surface side of the substrate 20, and the lower surface side of the storage section 12 is sealed by the sealing resin 21.

Further, a knob 22 having a substantially T shape is arranged in the storage section 12. This knob 22 has a rod-shaped leg portion 23 inserted into the insertion hole 14 with a slight clearance, and the leg portion 23 is received and supported by the upper surface of the movable portion 18 of the switch body 17. There is. The head 24 of the knob 22 projects into the second recess 15, and a gap is formed between the lower surface of the head 24 and the bottom surface 15a of the second recess 15 to allow the knob 22 to move up and down. It is in a state.

A thin film sheet 25 is provided on the upper surface of the case 11 so as to cover the knob 22. The sheet 25 is adhered to the upper surface of the case 11 with an adhesive 26 so as to seal the housing portion 12 from the outside. The sheet 25 has flexibility and is made of, for example, polyethylene film.

By pressing the head portion 24 of the knob 22 via the seat 25, the leg portion 23 presses the movable portion 18 of the switch body 17 to turn on the switch body 17, By releasing the pressing force applied to the switch 22, the knob 22 is returned to its original position by the urging force of the movable portion 18, and the switch body 17 is turned off.

On the other hand, a bellows 27 as a pressure adjusting means is provided below the left part of the case 11. The bellows 27 is communicated with the communication hole 16 through a pipe 28, so that the interior of the storage portion 12 and the interior of the bellows 27 are in communication with each other. The bellows 27 is made of, for example, polypropylene, and the pressure required for expanding and contracting the bellows 27 peels the sheet 25 against the adhesive 26 and the operating force for pressing the knob 22. It is set smaller than the peeling force.

The cord 29 connected to the switch body 17 is led out to the outside via a sealing resin 21.

Therefore, according to the above configuration, when the ambient temperature of the case 11 becomes high and the pressure in the storage section 12 becomes high, the bellows 27 expands to increase the pressure in the storage section 12. If the ambient temperature of the case 11 becomes low and the pressure in the storage section 12 becomes low, on the contrary, the bellows 27 contracts to suppress the pressure drop in the storage section 12. Like

That is, the pressure in the storage section 12 is adjusted based on the change in the internal capacity of the bellows 27 itself due to the expansion and contraction of the bellows 27, so that the pressure in the storage section becomes high and the pressure in the storage section becomes higher than in the conventional case. Air will not leak out. Therefore, it is possible to prevent the seat from being dented by the external pressure, and it is possible to prevent the knob from returning to its original position and the operation feeling of the knob from being deteriorated as much as possible.

Although the bellows 27 is used as the pressure adjusting means in the first embodiment, a structure such as a rubber balloon may be used instead of the bellows 27.

FIG. 2 shows a second embodiment of the present invention. The second embodiment differs from the first embodiment in the following points. That is, the recessed portion in the lower part of the first recessed portion 13 of the case 11 serves as the variable volume chamber 30, and the lower surface of the variable volume chamber 30 is sealed with the film 31 having elasticity. In addition, a communication hole 32 is formed in the substrate 20a of the switch body 17 to connect the inside of the storage portion 12 and the inside of the variable volume chamber 30. In this case, the variable volume chamber 30 and the film 31 constitute the pressure adjusting means 33.

According to this, when the pressure in the storage portion 12 becomes high, the film 31 swells and the volume of the variable volume chamber 30 becomes large, as shown by the chain double-dashed line in FIG. When the pressure inside the storage unit 12 is suppressed and the pressure inside the storage unit 12 becomes low, on the contrary, as shown by the alternate long and short dash line in FIG. Since the capacity is reduced, the pressure drop in the storage section 12 is suppressed.

[0021]

[Effect of the device]

 As is apparent from the above description, according to the switch device of the present invention, the pressure inside the storage section is adjusted by the change in the internal capacity of the pressure adjusting means, so the pressure applied to the seat that seals the storage section can be reduced. Therefore, it is possible to prevent the return of the knob from being bad and the operation feeling from being deteriorated as much as possible.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a first embodiment of the present invention.

FIG. 2 is a vertical sectional view showing a second embodiment of the present invention.

FIG. 3 is a view corresponding to FIG. 1 showing a conventional example.

[Explanation of symbols]

11 is a case, 12 is a storage part, 16 is a communication hole, 17 is a switch body, 22 is a knob, 25 is a seat, 27 is a bellows (pressure adjusting means), 30 is a variable volume chamber, 31 is a film, and 32 is a communication hole. , 33 are pressure adjusting means.

Claims (1)

[Claims for utility model registration] [Claim 1] A case having a storage portion, a switch body disposed in the storage portion, a knob for operating the switch body, a knob for operating the switch body, and the storage portion. In a switch device including a flexible sheet provided in the case so as to be hermetically sealed, a pressure adjusting unit that communicates with the storage unit and that changes an internal capacity based on a change in internal pressure is provided. Switch device.