TW201344729A - Waterproof micro switch - Google Patents

Abstract

A waterproof micro switch includes a switch body and an operation unit, the operation unit comprises a pressing portion and an elastic support member disposed on the switch body. The elastic support member includes an elastic portion connecting to the pressing portion and a base portion surrounding disposed on the bottom of the elastic portion. The base includes a first engaging portion adjacent the elastic portion, and a second engaging portion surrounding the elastic portion and away from the first engaging portion compared to the first engaging portion, the thickness of the second engaging portion is greater than the first engaging portion. The switch body includes a hot press shaped seal between the first engaging portion and the second engaging portion to seal the sealing part inside the switch body.

Description

Waterproof micro switch

The invention relates to a micro switch, in particular to a micro switch which uses a hot press forming process to form a waterproof structure.

According to the micro-switch, it is widely used in small electronic devices, which are adjacent contact control elements for turning on or off the circuit, and can realize the breaking or protection function of the electronic device. The structure of the micro switch generally includes a housing and a common terminal, a normally closed terminal, a normally open terminal, a movable guiding member and a button disposed in the housing. One end of the movable connecting member is connected to the common terminal, and the upper and lower displacement of the button can swing the other end of the movable connecting member between the normally closed terminal and the normally open terminal to switch between different communication states.

Since the small electronic device has almost no waterproof function, the electronic components inside the micro switch have the risk of coming into contact with liquid vapor or liquid. If the liquid vapor enters the inside of the micro switch, the electronic component will be corroded for a long time and the switching sensitivity of the micro switch will decrease. In addition, since the body of the micro switch is small, the internal electronic components are adjacent to each other. If liquid penetrates into the micro switch, the adjacent electronic components are turned on by the conduction of the liquid, thereby causing the micro switch to output incorrectly. Connected state. Therefore, if the micro switch can be made waterproof, the service life of the electronic device will be greatly extended, and the ultimate goal of saving resources will be achieved.

In view of the above, a micro-switch having a water-repellent capability can be found in the prior art. As disclosed in the Patent No. I315535 of the Republic of China, it is a combination of a cover and a body, the cover and the body. Corresponding first joint surface and second joint surface are disposed at the joint, and the first joint surface and the second joint surface are at least one joint surface reduced to form an adhesive gap, and the adhesive gap is adhered to the adhesive The first joint surface and the second joint surface are fixedly positioned by the adhesive. Although the front case forms a waterproof structure between the cover body and the seat body, there is also a gap between the button of the micro switch and the cover body. If water vapor enters the inside of the micro switch from the gap, the micro switch may also be caused. Internal electronic components are damaged.

In order to overcome the above problems, as disclosed in the Patent No. 589649 of the Republic of China, it mainly utilizes the technique of hot pressing shaping to close the gap between the button and the cover body. The front case mainly comprises a casing and an insulating material. The button is coupled to a cup-shaped waterproof member that connects the housing and the button, respectively. The housing has an upper surface, a recess disposed on the upper surface, and a protrusion disposed around the recess; the cup-shaped waterproof member has a base disposed in the recess. The front case melts and seals the convex portion to the cup-shaped waterproof member by using a high temperature to form a waterproof structure between the button and the casing.

However, the waterproof structure disclosed in the above prior art is often limited by the fact that the convex portion and the cup-shaped waterproof member do not completely closely adhere to each other after the hot press molding, and a gap is generated, and the space of the gap increases with the number of times the button is pressed. And gradually increase, so that the micro switch gradually loses its waterproof function.

The main object of the present invention is to solve the problem that the waterproof structure formed by the hot press forming process still has a gap after long-term use, which causes moisture to enter the inside of the micro switch.

In order to achieve the above object, the present invention provides a waterproof micro switch including a switch body and an operating unit disposed on the switch body, the switch body including a mounting portion for the operating unit and a switch set a switching component for generating an electrical signal output in the body, the operating unit includes a pressing portion for pressing the switching component, and a pressing portion disposed between the pressing portion and the mounting portion for supporting the pressing portion to reciprocate relative to the switching component Elastic support for the stroke.

The elastic support member includes a resilient portion connected to the pressing portion and a base portion disposed at the bottom of the elastic portion for seating in the mounting portion, the base portion including a first engaging portion adjacent to the elastic portion, and a a second joint portion surrounding the elastic portion and away from the elastic portion, the second joint portion having a larger thickness than the first joint portion, the mounting portion including a heat compression molding sealing The first joint portion and the second joint portion seal a seal portion inside the switch body, the seal portion has an operation surface and a connection surface connecting the operation surface and positioning the base portion, and the seal portion is integrated Formed in the mounting portion.

In an embodiment of the invention, the mounting portion includes a carrier for the elastic support member and a through hole surrounded by the carrier and for reciprocating the pressing member relative to the switching assembly. The pressing portion has a positioning portion, and the elastic portion forms a positioning ring connected to the positioning portion with respect to one end of the base portion. The base includes an intermediate portion between the first joint portion and the second joint portion, and the intermediate portion has an increasing thickness from the first joint portion to the second joint portion.

In an embodiment of the invention, the intermediate section has a contact surface that is in contact with the sealing portion, and the contact surface has a height difference from the top of the second joint portion, so that the sealing portion is after hot pressing Fastened to the second joint.

In an embodiment of the invention, the switching component includes a movable guiding member, a first conductive pin connected to the movable connecting member, and a second conductive pin and a third conductive pin. The movable guiding member has a normal position for guiding the first conductive pin and the third conductive pin and a first conductive pin and the second conductive pin for switching The component generates a trigger position for the electrical signal output. The switching component further includes a support member having one end connected to the first conductive pin and the other end supporting the movable conductive member normally connected to the third conductive pin, and the movable guide member is a conductive elastic piece.

Through the above technical solutions, the advantages of the present case over the prior art are:

1. The base of the operating unit has a first engaging portion, a second engaging portion and an intermediate portion between the first engaging portion and the second engaging portion, and the second engaging portion has a first engaging portion Large thickness. Therefore, when the sealing portion of the switch body is heat-pressure-sealed to the first joint portion and the second joint portion, the intermediate portion is in close contact with the seal portion, thereby preventing generation of a gap.
2. In this case, it is not necessary to use an adhesive, and only the structure of the base needs to be changed to achieve the purpose of reinforcing the waterproof structure. Therefore, not only cost saving but also a simple manufacturing process is required.

The detailed description and technical contents of the present invention will now be described as follows:

Please refer to FIG. 1 and FIG. 2 , which are schematic diagrams showing the appearance and structure of a waterproof micro switch according to the present invention. As shown in the figure, the waterproof micro switch 100 includes a switch body 10 and a switch. The operating unit 20 on the body 10. Basically, the switch body 10 is composed of a cover body 1 and a base body 2. The switch body 10 has a switch assembly 12 disposed on the base body 2, and the cover body 1 includes a handle for the operation. The unit 20 is provided with a mounting portion 11 having a resilient support member 21 disposed on the mounting portion 11 and a pressing portion 22 that receives the switching assembly 12 under pressure. The switching component 12 includes a movable guiding member 121, a first conductive pin 122 connected to the movable guiding member 121 and passing through the base body 2, and a second conductive pin 123 passing through the base 2. a third conductive pin 124 of the body 2, and a support member 125 connecting the first conductive pin 122 and the movable connecting member 121 respectively, through the first, second, and The three conductive pins 122, 123, and 124 are stably mounted in an electronic device (not shown), such as a circuit board.

Referring to FIG. 3, a partial cross-sectional view of a waterproof micro switch according to the present invention is shown. As shown in the figure, the elastic support member 21 is disposed between the pressing portion 22 and the mounting portion 11, and includes a The elastic portion 211 of the pressing portion 22 is connected, and a ring is disposed at the bottom of the elastic portion 211 to seat the elastic supporting member 21 on the base portion 212 of the mounting portion 11. The elastic supporting member 21 is supported by the elastic portion 211. The pressing portion 22 performs a reciprocating stroke with respect to the switching assembly 12. In an embodiment of the present invention, the mounting portion 11 includes a bearing base 111 for the elastic supporting member 21, and the pressing portion 22 is opposite to the through hole 112 surrounded by the bearing base 111. Assembly 12 performs this reciprocating stroke. Further, the pressing portion 22 has a positioning portion 221 near the upper end, and the elastic portion 211 forms a positioning ring 217 connected to the positioning portion 221 with respect to one end of the base portion 212. The positioning portion 221 and the positioning ring The 217 is closely attached to each other to prevent moisture from entering the inside of the switch body 10 from the junction of the positioning section 221 and the positioning ring 217.

In the detailed structure of the present invention, as shown in FIG. 3, the base portion 212 of the elastic support member 21 includes a first joint portion 213 and a second joint portion 214 adjacent to the elastic portion. 211, the second joint portion 214 surrounds the elastic portion 211 and is away from the elastic portion 211 than the first joint portion 213. Further, the second joint portion 214 has a larger thickness than the first joint portion 213. In order to securely fix the base portion 212 of the elastic support member 21 to the bearing base 111, the mounting portion 11 includes a sealing portion 113 integrally formed on the mounting portion 11, and the sealing portion 113 has a sealing portion 113. The operating surface 114 is coupled to the operating surface 114 and positions the connecting surface 115 of the base 212. In a hot press forming process, the sealing portion 113 is first heated to a degree that can be easily deformed, and a pressure channel is applied to the operating surface 114. The operating surface 114 drives the connecting surface 115 to move downward and is cooled. The first joint portion 213 and the second joint portion 214 are sealed later, thereby sealing the inside of the switch body 10. In the preferred embodiment of the present invention, the first joint portion 213 and the second joint portion 214 have an intermediate portion 215 from the first joint portion 213 to the second joint portion 214. Increasing thickness.

After the hot press forming process, the intermediate section 215 has a contact surface 216 that is in contact with the sealing portion 113 and is inclined away from the elastic portion 211, and the sealing portion 113 has the intermediate portion 215 A contact surface 115 that is in contact with and that is inclined downward in the direction of the elastic portion 211. The intermediate portion 215 and the sealing portion 113 form a waterproof structure having a fitting relationship by the contact surface 216 and the connecting surface 115. Therefore, a gap is not formed between the intermediate portion 215 and the sealing portion 113, and the base portion 212 is not easily separated from the bearing base 111. Thus, the micro switch 100 not only has a better waterproof function, but also has a more stable structure. However, the above-described embodiments are merely examples, and any simple changes made to the intermediate segment 215 by those skilled in the art still fall within the scope of the patent application. For example, the contact surface 216 of the intermediate segment 215 is The contact surface 216 of the intermediate portion 215 may also be an upwardly convex curved surface, or the contact surface 216 of the intermediate portion 215 is spaced apart from the second joint portion 214 as shown in FIG. The top portion has a height drop such that the sealing portion 113 contacts the intermediate portion 215 by a hot press molding process, and the sealing portion 113 engages the second joint portion 214.

Referring to FIG. 4 and FIG. 5, it is a schematic diagram of the operation of a waterproof micro switch according to the present invention. As shown in FIG. 4, the pressing portion 22 is normally in contact with the uncompressed state. The movable connecting member 121, the supporting member 125 fixed to the first conductive pin 122 normally supports the movable connecting member 121, and the two ends of the movable connecting member 121 are respectively connected and electrically connected to the first conductive pin 122. The third conductive pin 124 places the movable guiding member 121 in a normal position. As shown in FIG. 5, in the pressed state, the pressing portion 22 presses down the movable guiding member 121, and the movable guiding member 121 swings downward to make both ends of the movable guiding member 121. The first conductive pin 122 and the second conductive pin 123 are respectively connected and connected. At this time, the movable guiding member 121 is located at a trigger position to generate a signal output. In the above embodiment, the movable guiding member 121 is a conductive elastic piece.

In summary, the present invention is mainly directed to the improvement of the base 212 of the elastic support member 21, such that the base portion 212 includes a first joint portion 213 and a second joint portion having a larger thickness than the first joint portion 213. 214. Thus, after a hot-pressing process, the connecting surface 115 of the sealing portion 113 can form an inlay with the intermediate portion 215 between the first engaging portion 213 and the second engaging portion 214. In the waterproof structure of the relationship, since the waterproof structure is less likely to generate a gap, the micro switch 100 of the present invention can prevent moisture from entering the inside of the switch body after long-term use, which greatly increases the service life of the micro switch 100. On the other hand, the micro switch 100 of the present invention does not need to use an adhesive around the pressing portion, but only needs to change the structure of the base to achieve the purpose of reinforcing the waterproof structure, thereby saving cost and simplifying the manufacturing process.

Therefore, the present invention is highly progressive and conforms to the requirements of the invention patent application, and the application is filed according to law, and the praying office can grant the patent as soon as possible.

The present invention has been described in detail above, but the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the scope of the invention. That is, the equivalent changes and modifications made by the scope of the present application should remain within the scope of the patent of the present invention.

1. . . Cover

2. . . Seat

10. . . Switch body

11. . . Installation department

100. . . Micro Switch

111. . . Carrier

112. . . Through hole

113. . . Sealing part

114. . . Operating surface

115. . . Connection surface

12. . . Switching component

121. . . Activity guide

122. . . First conductive pin

123. . . Second conductive pin

124. . . Third conductive pin

125. . . supporting item

20. . . Operating unit

twenty one. . . Elastic support

211. . . Elastic part

212. . . Base

213. . . First joint

214. . . Second joint

215. . . Middle section

216. . . Contact surfaces

217. . . Locating ring

twenty two. . . Pressing part

221. . . Positioning segment

Fig. 1 is a perspective view showing the appearance of the waterproof micro switch of the present invention.

2 is a structural exploded view of the waterproof micro switch of the present invention.

3 is a schematic cross-sectional view showing a partial structure of the waterproof micro switch of the present invention.

Fig. 4 is a schematic view showing the operation of the waterproof micro switch of the present invention.

Fig. 5 is a schematic view showing the operation of the waterproof micro switch of the present invention.

Figure 6 is a cross-sectional view showing a partial structure of another embodiment of the waterproof microswitch of the present invention.

1. . . Cover

2. . . Seat

10. . . Switch body

100. . . Micro Switch

111. . . Carrier

112. . . Through hole

113. . . Sealing part

114. . . Operating surface

115. . . Connection surface

12. . . Switching component

121. . . Activity guide

122. . . First conductive pin

123. . . Second conductive pin

124. . . Third conductive pin

125. . . supporting item

20. . . Operating unit

twenty one. . . Elastic support

211. . . Elastic part

212. . . Base

213. . . First joint

214. . . Second joint

215. . . Middle section

216. . . Contact surfaces

217. . . Locating ring

twenty two. . . Pressing part

twenty two. . . Positioning segment

Claims (11)

A waterproof micro switch includes a switch body and an operation unit disposed on the switch body, the switch body includes a mounting portion for the operating unit and a switching component disposed in the switch body for generating an electrical signal output The operating unit includes a pressing portion that is pressed to trigger the switching assembly, and an elastic support member disposed between the pressing portion and the mounting portion for supporting the pressing portion to reciprocate relative to the switching assembly. Lie in:
The elastic support member includes a resilient portion connected to the pressing portion and a base portion disposed at the bottom of the elastic portion for seating in the mounting portion, the base portion including a first engaging portion adjacent to the elastic portion, and a a second joint portion surrounding the elastic portion and away from the elastic portion, the second joint portion having a larger thickness than the first joint portion, the mounting portion including a heat compression molding sealing The first joint portion and the second joint portion seal the seal portion inside the switch body. The waterproof microswitch of claim 1, wherein the base includes an intermediate portion between the first joint and the second joint. The waterproof microswitch of claim 2, wherein the intermediate section has an increasing thickness from the first joint to the second joint. The waterproof micro switch of claim 2, wherein the intermediate section has a contact surface in contact with the sealing portion, the contact surface having a height difference from a top of the second joint portion, the sealing being The second engaging portion is fastened after the hot press molding. The waterproof micro switch according to claim 1, wherein the sealing portion has an operation surface and a connection surface that connects the operation surface and positions the base. The waterproof micro switch according to claim 1, wherein the sealing portion is integrally formed in the mounting portion. The waterproof micro switch according to claim 1, wherein the mounting portion includes a carrier for the elastic support member and a surrounding of the carrier and the pressing member is opposite to the switching assembly. Through hole for reciprocating stroke. The waterproof micro switch according to claim 1, wherein the pressing portion has a positioning portion, and the elastic portion forms a positioning ring connected to the positioning portion with respect to one end of the base portion. The waterproof micro switch according to claim 1, wherein the switching component comprises a movable guiding member, a first conductive pin connected to the movable connecting member, a second conductive pin and a third a conductive pin having a normal position corresponding to the first conductive pin and the third conductive pin and a first conductive pin and the second conductive connection corresponding to the reciprocating stroke of the pressing portion The foot causes the switching component to generate a trigger position for the electrical signal output. The waterproof micro switch of claim 9, wherein the switching component comprises a support member having one end connected to the first conductive pin and the other end supporting the movable conductive member normally connected to the third conductive pin. The waterproof micro switch according to claim 9, wherein the movable guide member is a conductive elastic piece.