Microswitch

Abstract

The utility model provides a microswitch. The microswitch comprises a button assembly, a movable elastic sheet and a pin assembly. The button assembly abuts against the movable elastic sheet. The pin assembly comprises a first pin, a second pin and a third pin; an upper contact and a lower contact are arranged on the front surface and the back surface of the movable elastic sheet; the first pin and the second pin are respectively provided with a contact. The contact of the first pin and the contact of the second pin are located in the same vertical direction; the movable elastic sheet is arranged at the middle position of the first pin and the second pin; one end of the movable elastic sheet abuts against the contact of the first pin and abuts against the contact of the second pin when the movable elastic sheet is in a downward pressing state, and the other end of the movable elastic sheet is connected with the third pin in a buckled mode. According to the microswitch provided by the utility model, when the button is pressed down, a spring part is omitted, the acting force directly acts on the elastic sheet, and the microswitch has the advantages of quick response, simpler structure and higher efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of switches, in particular to a micro switch. Background Art

[0002] A micro switch is a switch that can be touched with a tiny force. It is a switch that disconnects or connects the circuit through an external force. Micro switches are widely used in electronic equipment, instrumentation, power systems or electrical equipment.

[0003] The micro switches commonly used today often use spring assemblies, and the applied force must be transmitted through the spring assembly and the movable piece.

[0004] The existing micro switch needs to be provided with a spring assembly and a movable piece, the switch structure is complicated, the applied force has to pass through the spring and the movable piece, the response is slow, and the efficiency is low. Utility Model Content

[0005] In view of the above problems, the present utility model is proposed to provide a micro switch that overcomes the above problems or at least partially solves the above problems.

[0006] In order to solve the above problems, the utility model discloses a micro switch, comprising: a button assembly, a movable elastic sheet and a pin assembly; the button assembly abuts against the movable elastic sheet; the pin assembly comprises a first pin, a second pin and a third pin; an upper contact and a lower contact are arranged on the front and back sides of the movable elastic sheet; contacts are arranged on the first pin and the second pin respectively; the contact of the first pin and the contact of the second pin are located in the same vertical direction; the movable elastic sheet is arranged at a middle position between the first pin and the second pin; one end of the movable elastic sheet abuts against the contact of the first pin, and abuts against the contact of the second pin when in a pressed state, and the other end is snap-connected with the third pin.

[0007] Furthermore, the micro switch also includes an upper shell, a lower shell and a protective cover; the upper shell and the lower shell are snap-connected to form a chamber; the protective cover wraps the upper shell and the lower shell, and is snap-connected to the lower shell; the button assembly, the movable elastic sheet and the pin assembly are arranged in the chamber formed by the upper shell and the lower shell.

[0008] Furthermore, a hole is provided at the top of the upper shell, and the button assembly is arranged in the hole and abuts against the movable elastic sheet.

[0009] Furthermore, the button assembly is a column whose contact surface with the movable elastic sheet is an arc-shaped column.

[0010] Furthermore, the movable elastic sheet is an elastic sheet provided with a U-shaped hole; the U-shaped hole of the elastic sheet is buckled and connected to the third pin.

[0011] Furthermore, the first pin, the second pin and the third pin respectively pass through the bottom of the lower shell.

[0012] The utility model has the following advantages:

[0013] The utility model adopts a single elastic sheet, which has a simpler structure and lower cost than a switch with a spring component. In addition, because the force acts directly on the elastic sheet without passing through multiple groups of components, the response is faster and the efficiency is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of an embodiment of a micro switch of the utility model;

[0015] Figure 2 It is a schematic structural diagram of a micro switch embodiment of the utility model from a side view;

[0016] Figure 3 It is a structural schematic diagram of an embodiment of a micro switch of the utility model;

[0017] Figure 4 It is a structural schematic diagram of a protective cover of a micro switch of the utility model;

[0018] Figure 5 It is a structural schematic diagram of a lower housing of a micro switch of the utility model;

[0019] Figure 6 The utility model is a schematic structural diagram of an upper housing of a micro switch.

[0020] Figure numerals: 1, button assembly; 2, movable elastic sheet; 3, pin assembly; 21, upper contact; 22, lower contact; 23, rectangular sheet; 24 elastic sheet; 31 first pin; 32 second pin; 33 third pin. DETAILED DESCRIPTION

[0021] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0022] One of the core concepts of the utility model is to provide a movable elastic sheet, omit the spring, and ensure the normal operation of the micro switch by the elasticity of the elastic sheet.

[0023] Reference Figure 1, shows a schematic diagram of the structure of a micro switch embodiment of the utility model, which may specifically include: a button assembly 1, a movable elastic sheet 2 and a pin assembly 3. The button assembly 1 and the movable elastic sheet 2 are in contact. It should be noted that the commonly used switch materials are ABS (Acrylonitrile Butadiene Styrene plastic), PC (Polycarbonate) material and electric jade powder. The characteristics of ABS are low-grade engineering plastics for DC (Direct-current) sockets, easy to change color, and low strength; the characteristics of PC material are strong impact resistance, strong heat resistance, and high transparency; the characteristics of electric jade powder are absolutely flammable, never discolor, never wear, and strong thermochemical properties. The above materials can be selected, each with its own advantages. The pin assembly includes a first pin 31, a second pin 32 and a third pin 33. The first pin 31, the second pin 32 and the third pin 33 are all media with good conductive properties, such as copper and tin. Hot-dip tinning is more preferably used, which has the advantages of being cheap, low cost and easy to obtain. If high quality is pursued, cold-dip tinning or copper is used, which is stable and not easy to oxidize, but has the disadvantage of being expensive.

[0024] Contacts are respectively arranged on the front and back sides of the movable elastic sheet 2, the first pin 31 and the second pin 32, wherein the contact point between the front side of the movable elastic sheet 2 and the first pin 31 is the upper contact 21, and the contact point between the back side of the movable elastic sheet 2 and the second pin is the lower contact 22. It should be noted that the contact is the position where the front and back sides of the movable elastic sheet 2, the first pin 31 and the second pin 32 contact, which is convenient for transmitting electrical signals. Pure silver or silver alloy is commonly used, wherein pure silver has low resistance, soft texture, low melting point, easy oxidation, easy arc generation, Burn out wires or switch elements, waterproof touch switch causes poor power supply; silver alloy has low resistance, wear-resistant texture, high melting point, oxidation resistance, and comprehensive performance is superior to pure silver. It is more preferred to use silver alloy, the cost is correspondingly reduced, more stable, and the comprehensive performance is better. The first pin 31 and the second pin 32 are more preferred; the contact of the first pin 31 and the contact of the second pin 32 are located in the same vertical direction. It should be noted that the same horizontal direction is also acceptable, but the horizontal direction can also be flipped, so that it is considered to be in the vertical direction, which does not affect its structure.

[0025] Furthermore, the movable elastic sheet 2 is an elastic sheet with a U-shaped hole. In this case, the movable elastic sheet 2 includes an upper contact 21, a lower contact 22, a rectangular sheet 23 and an elastic sheet 24. It should be noted that the elasticity of the movable elastic sheet 2 is such that it can restore its original shape or state after an oblique force is applied. After the movable elastic sheet 2 has a U-shaped hole, a rectangular sheet 23 with one end fixed to the movable elastic sheet is formed. The other end of the rectangular sheet 23 is bent downward and fixedly connected to the third pin 33. At the same time, the elastic sheet 24 is also fixedly connected to the third pin 33, so that the rectangular sheet 23 maintains a certain tension state, which is similar to a water drop hairpin, except that the rectangular sheet is restored immediately after the force is unloaded, and it is more preferably fixed by a buckle. It should be noted that when installing the movable elastic sheet 2, a rotation space should be reserved.

[0026] The movable elastic sheet 2 is arranged at the middle position between the first pin 31 and the second pin 32. Since it is necessary to ensure that the upper contact 21 is in contact with the contact of the first pin 31 in the initial state, and the lower contact 22 is in contact with the contact of the second pin 32 when in the pressed state, the upper contact 21 and the lower contact 22 should be located in the same vertical direction as the contact of the first pin 31 and the second pin 32. It should be noted that the quality of the micro switch mainly depends on the spring and the contact. The selection of the appropriate material is the key. The material selection of the movable elastic sheet 2 should pay attention to the selection of materials with strong elasticity. Brass, beryllium bronze and red copper are often used. The characteristics of brass are hardness, slightly weak elasticity, medium conductivity, and bright yellow; the characteristics of beryllium bronze are hardness, good elasticity, and medium conductivity; the characteristics of red copper are slightly softness, good elasticity, high conductivity, and purple-red color. It can be selected according to actual needs. The movable elastic sheet 2 is deformed after the force is applied, and the state when pressed down here is bending deformation. After the force is removed, the movable elastic sheet 2 returns to the initial shape and can be restored. It should be noted here that in the initial state, the movable elastic sheet 2 receives the elastic force from the rectangular sheet 23, and the rectangular sheet 23 squeezes and is snap-connected with the third pin 33, so that the elastic force is continuously generated. At this time, the movable elastic sheet 2 maintains balance, and when the movable elastic sheet 2 receives the pressure from the button assembly 1 and moves downward, the pressure breaks the balance of the movable elastic sheet 2, so it moves downward. At this time, because the movable elastic sheet 2 is constantly deflected downward, the rectangular sheet 33 becomes more and more curved, and the elastic force generated is greater than the elastic force in the initial state. At this time, the applied pressure needs to be continuously increased to realize the downward movement of the button. When the downward pressure is removed, the movable elastic sheet 2 cannot maintain balance under the action of the elastic force at this time, and moves in the opposite direction to reach the initial state to achieve balance, thus realizing micro movement. The contact at one end of the movable elastic piece 2 abuts against the contact of the first pin 1 , and abuts against the contact of the second pin 32 when in a pressed state, and the elastic piece 34 and the rectangular piece 33 at the other end are snap-connected with the third pin 33 .

[0027] By eliminating the spring, the micro switch structure is simpler, and since the response no longer needs to go through the spring and directly acts on the movable elastic sheet 2, the response time is faster and the sensitivity is higher.

[0028] As a preferred embodiment of the present application, the micro switch should also include a shell 4, which includes an upper shell 41, a lower shell 42 and a protective cover 43. The shell 4 as a whole serves to accommodate and protect the micro switch. The upper shell 41 and the lower shell 42 are snap-fitted together to form a chamber; the protective cover 43 wraps around the upper shell 41 and the lower shell 42, and is snap-fitted together with the lower shell 42; wherein the upper shell 41 and the lower shell 42 are columns that can fit each other, and can be a cuboid, a cube, a cylinder, etc., and a cuboid is more preferred to accommodate components of different shapes, and the upper shell 41 is a cuboid with a hollow bottom, and a type of handle is provided on both sides of the bottom, and the lower shell 42 is a solid cuboid, and the upper shell 41 and the lower shell 42 only need to be fixed together, and snap-fitting is more preferred. The connection is that a trapezoidal body protrudes from both sides of the lower shell 42, and its inclined surface can facilitate installation. The upper shell 41 has a rectangular hole dug at the corresponding position of the handle, and its size corresponds to the trapezoidal body. After installation, the upper shell 41 and the lower shell 42 form a chamber; trapezoidal bodies are also protruding from the other two sides of the lower shell 42, and the protective cover 43 further fixes and protects the sides of the upper shell 41 and the lower shell 42. The protective cover 43 covers the sides of the upper shell 41 and the lower shell 42, and a rectangular hole is set at the corresponding position of the trapezoidal body of the lower shell 42 other than the connection between the upper shell 41 and the lower shell 42.

[0029] Furthermore, the first pin 31, the second pin 32 and the third pin 33 respectively pass through the bottom of the lower shell 42 for a certain distance, so as to facilitate external circuit connection, and the lower shell 42 fixes the first pin 31, the second pin 32 and the third pin 33. The button assembly 1, the movable elastic sheet 2 and the pin assembly 3 are arranged in the chamber formed by the upper shell 41 and the lower shell 42. It should be noted that the pin assembly 3 is fixedly installed in the lower shell 42 and passes through a certain distance, and the first pin 31, the second pin 32 and the third pin 33 pass through the same distance from each other. It is often adopted that the base is cast by plastic molding on the basis of the first pin 31, the second pin 32 and the third pin 33.

[0030] Furthermore, a hole is provided at the top of the upper shell 41, and the button assembly 1 is arranged in the hole and abuts against the movable elastic sheet 2. The hole limits the horizontal movement of the button assembly 1 and only allows it to move in the vertical direction.

[0031] Furthermore, the button assembly 1 includes but is not limited to a column with an arc-shaped contact surface, and can be any column as long as it has a certain rigidity and is not easily deformed or oxidized.

[0032] Before pressing down, the button component 1 abuts against the movable elastic sheet 2, the tail ends of the first pin 31 and the second pin 32 are respectively connected to the circuit, and the tail end of the third pin 33 is connected to the power supply. At this time, the contact on one side of the movable elastic sheet 2 is in contact with the contact of the first pin 31, which is usually the default state. There are often no other electronic components in the circuit connected to the first pin 31 or the circuit is open. When pressing down, the button component 1 is pressed, and the button component 1 transmits pressure to cause the movable elastic sheet 2 to deflect downward, and its other side contact is in contact with the contact of the second pin 32. The circuit connected to the second pin 32 is often a circuit with the required electronic components. At this time, the electronic component loop is connected. After unloading, the movable elastic sheet 2 resumes the abutment with the first pin 31.

[0033] By setting the shell component 4, the various components of the micro switch can be protected to a certain extent, and the pins are led out a certain distance to make it more convenient to connect to the circuit. The structural setting of the movable elastic piece 2 is simpler but can achieve the required functions, which saves costs on the one hand and is more efficient on the other.

[0034] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements.

[0035] The micro switch provided by the utility model is introduced in detail above. The principle and implementation mode of the utility model are explained in this article by using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the utility model. At the same time, for those skilled in the art, according to the idea of ​​the utility model, there will be changes in the specific implementation mode and application scope. In summary, the content of this specification should not be understood as a limitation on the utility model.

Claims

1. A micro switch, characterized in that: include: Button assembly, movable elastic sheet and pin assembly; The button assembly is in abutment with the movable elastic sheet; The pin assembly includes a first pin, a second pin and a third pin; The upper contact point and the lower contact point are arranged on the front and back sides of the movable elastic piece; Contacts are respectively arranged on the first pin and the second pin; The contact point of the first pin and the contact point of the second pin are located in the same vertical direction; The movable elastic piece is arranged at a middle position between the first pin and the second pin; One end of the movable elastic sheet abuts against the contact point of the first pin, and abuts against the contact point of the second pin when in a pressed state, and the other end is buckled and connected with the third pin.

2. The micro switch according to claim 1, characterized in that: The micro switch also includes an upper housing, a lower housing and a protective cover; The upper shell and the lower shell are snap-connected to form a chamber; the protective cover covers the upper shell and the lower shell, and is snap-connected to the lower shell; The button assembly, the movable elastic sheet and the pin assembly are arranged in a cavity formed by the upper shell and the lower shell.

3. The micro switch according to claim 2, characterized in that: The top of the upper shell is provided with a hole, the button assembly is arranged in the hole and abuts against the movable elastic sheet.

4. The micro switch according to claim 3, characterized in that: The button assembly is a column whose contact surface with the movable elastic sheet is an arc-shaped column.

5. The micro switch according to claim 1, characterized in that: The movable elastic sheet is an elastic sheet provided with a U-shaped hole; the U-shaped hole of the elastic sheet is buckled and connected with the third pin.

6. The micro switch according to claim 2, characterized in that: The first pin, the second pin and the third pin respectively pass through the bottom of the lower shell.

Images