A micro switch with high reliability

Abstract

The utility model discloses a kind of high-reliability microswitch, including upper cover, lower shell, electrical positive pin and electrical negative pin, the electrical positive pin and electrical negative pin are all installed on lower shell, the upper cover is fixed on lower shell, further include push rod, metal pivot, spring piece and conductive push piece, the push rod is slidably connected on lower shell, the push rod one end has control handle, the push rod other end has limit head, the metal pivot is fixed in lower shell, the electrical negative pin and metal pivot are fixed and electrically conductive, the metal pivot and conductive push piece one end are fixed and electrically conductive, the conductive push piece other end has with limit head movable cooperation movement guide groove, the conductive push piece middle part has contact one, the electrical positive pin has with contact one cooperation contact two, the spring piece one end is fixed in lower shell, the spring piece other end and conductive push piece other end abut.

Description

Technical Field

[0001] This utility model relates to the field of switch technology, and in particular to a highly reliable micro switch. Background Technology

[0002] A micro switch is a device that moves (slides / rotates) when its contacts are triggered by an external force. The contacts move along with the internal conductor plates, thereby connecting or disconnecting the positive and negative terminals.

[0003] Current microswitches use a conductor plate (copper plate) as an elastic moving body. The conductor plate has excellent conductivity, but poor fatigue resistance and elasticity, making it prone to breakage during reciprocating motion. Using a compression spring or torsion spring increases the actuation force, resulting in uneven travel of the microswitch and also increasing costs. Therefore, designing a highly reliable microswitch is essential. Summary of the Invention

[0004] The purpose of this application is to provide a highly reliable micro switch.

[0005] To achieve the above objectives, this application provides the following technical solution: a highly reliable micro switch, comprising an upper cover, a lower housing, an electrical positive pin, and an electrical negative pin, wherein the electrical positive pin and the electrical negative pin are both mounted on the lower housing, and the upper cover is fixed to the lower housing. The switch is characterized by further comprising a push rod, a metal shaft, a spring, and a conductive push plate. The push rod is slidably connected to the lower housing, one end of the push rod has a control handle, and the other end of the push rod has a limiting head. The metal shaft is fixed inside the lower housing. The electrical negative pin and the metal shaft are fixed and electrically connected. The metal shaft and one end of the conductive push plate are fixed and electrically connected. The other end of the conductive push plate has a motion guide groove that movably engages with the limiting head. The conductive push plate has a contact point one in its middle, and the electrical positive pin has a contact point two that engages with contact point one. One end of the spring is fixed inside the lower housing, and the other end of the spring abuts against the other end of the conductive push plate.

[0006] The shape of the spring is parabolic.

[0007] The other end of the shrapnel also has an avoidance notch.

[0008] The metal shaft has an auxiliary groove, and one end of the conductive pusher has a connector that fits tightly with the auxiliary groove.

[0009] In summary, the technical effects and advantages of this utility model are as follows: This invention features a dedicated metal shaft that increases rotational smoothness without reducing conductivity; it also employs a localized press-and-rebound design that integrates rotation and rebound into one unit while ensuring the motion trajectory, thereby reducing costs and the number of parts. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the embodiments or the prior art will be briefly introduced below.

[0011] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the planar structure of the present invention with the top cover removed; Figure 3 This is a three-dimensional structural diagram of the present invention with the top cover removed; Figure 4 This is a three-dimensional structural diagram of the present invention with the removed portion; Figure 5 Exploded view of the disassembled portion of this utility model; In the diagram: 1. Top cover; 2. Electrical negative pin; 3. Electrical positive pin; 3a. Contact 2; 4. Push rod; 4a. Control handle; 4b. Limiting head; 5. Lower housing; 6. Metal shaft; 6a. Auxiliary groove; 7. Conductive push plate; 7a. Motion guide groove; 7b. Connector; 7c. Contact 1; 8. Spring piece; 8a. Clearance notch. Detailed Implementation

[0012] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0013] like Figures 1-5 As shown, this highly reliable micro switch includes an upper cover 1, a lower housing 5, an electrical positive pin 3, and an electrical negative pin 2. Both the electrical positive pin 3 and the electrical negative pin 2 are mounted on the lower housing 5. The upper cover 1 is fixed on the lower housing 5. It also includes a push rod 4, a metal shaft 6, a spring 8, and a conductive push plate 7. The push rod 4 is slidably connected to the lower housing 5. One end of the push rod 4 has a control handle 4a, and the other end of the push rod 4 has a limiting head 4b. The metal shaft 6 is fixed inside the lower housing 5. The electrical negative pin 2 and the metal shaft 6 are fixed and electrically connected. One end of the metal shaft 6 and the conductive push plate 7 are fixed and electrically connected. The other end of the conductive push plate 7 has a motion guide groove 7a that movably cooperates with the limiting head 4b. The conductive push plate 7 has a contact 7c in the middle. The electrical positive pin 3 has a contact 3a that cooperates with the contact 7c. One end of the spring 8 is fixed inside the lower housing 5, and the other end of the spring 8 abuts against the other end of the conductive push plate 7.

[0014] The spring 8 is parabolic in shape. In this embodiment, the spring 8 is made of a material with good elasticity, such as stainless steel or 65Mn. It can be designed with an eccentricity and is made using existing technology.

[0015] The spring 8 with this shape has the following advantages: when the push rod 4 moves inward, it is easily compressed, resulting in a relatively large deformation. However, the main stress change is concentrated at the parabolic center of the spring 8; that is, the resistance moves backward, making it easier for the push rod 4 to move backward. As the distance the push rod 4 moves increases, the amount of compression of the spring 8 increases, and the stress of the spring 8 also increases, which will generate a lot of resistance, making it difficult for the push rod 4 to move inward. In the initial stage of the push rod 4's rebound, the spring 8 can provide a large initial rebound force, that is, the initial acceleration of the push rod 4 is large, and it rebounds quickly. However, the force will decrease in the later stage of the rebound, the acceleration will decrease, and it will gradually stop under the action of friction.

[0016] The other end of the shrapnel 8 also has an avoidance notch 8a.

[0017] The metal shaft 6 has an auxiliary groove 6a, and one end of the conductive pusher 7 has a connector 7b that fits tightly with the auxiliary groove 6a. The connector 7b is formed in the form of a flange. The conductive pusher 7 has good conductivity, but its toughness is poor, and it is prone to breakage when subjected to large positional deformation. Therefore, a metal shaft 6 is specially designed so that the conductive pusher 7 can move around the metal shaft 6. However, due to the existence of rotational clearance, the contact between the conductive pusher 7 and the metal shaft 6 and the electrical negative pin 2 is poor. To address this, an auxiliary groove 6a is designed on the metal shaft 6 to increase the contact area between the conductive pusher 7 and the metal shaft 6. At the same time, when the conductive pusher 7 rotates around the metal shaft 6, it will further compress the connector 7b of the conductive pusher 7 in the auxiliary groove 6a, thereby further reducing the contact resistance. Moreover, the auxiliary groove 6a is located at the root of the rotation of the conductive pusher 7, which is the position where the minimum deformation occurs during the entire movement. Therefore, this design ensures both good conductivity of the conductive pusher 7 and its smooth movement and toughness.

[0018] The working principle of this micro switch is as follows: the push rod 4 is pushed by an external force to slide. The limiting head 4b of the push rod 4 moves in the movement guide groove of the conductive push plate 7, which drives the conductive push plate 7 to rotate around the metal shaft 6. Due to the movement of the conductive push plate 7, the first contact 7c will be separated from the second contact 3a, thereby disconnecting the electrical positive pin 3 from the electrical negative pin 2 and no longer being in a conductive state, thus realizing the disconnection function of the switch.

[0019] Due to the movement of the conductive pusher 7, the spring 8 is compressed and the conductive pusher 7 is compressed and deformed in the auxiliary groove 6a, thereby generating a reverse thrust in the spring 8 and a reverse torsional force in the conductive pusher 7. After the external thrust disappears, the conductive pusher 7 will return to its original initial state, thereby making contact 1 7c and contact 2 3a conduct, realizing the conduction function of the micro switch.

[0020] In summary, the switch allows for easy force application, enabling contact 7c to separate from contact 3a. After the force is removed, it can quickly reset, while also ensuring the conductivity of the entire microswitch.

[0021] In this application, "fixed and electrically conductive" refers to a wrapped type of fixed and electrically conductive, which is achieved using existing technology.

[0022] All of the above components are general standard parts or components known to those skilled in the art. Their structure and principles can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0023] Finally, it should be noted that the above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A highly reliable micro switch, comprising an upper cover (1), a lower housing (5), an electrical positive pin (3), and an electrical negative pin (2), wherein the electrical positive pin (3) and the electrical negative pin (2) are both mounted on the lower housing (5), and the upper cover (1) is fixed on the lower housing (5), characterized in that, It also includes a push rod (4), a metal shaft (6), a spring (8) and a conductive push plate (7). The push rod (4) is slidably connected to the lower housing (5). One end of the push rod (4) has a control handle (4a) and the other end of the push rod (4) has a limiting head (4b). The metal shaft (6) is fixed inside the lower housing (5). The electrical negative pin (2) and the metal shaft (6) are fixed and electrically connected. One end of the metal shaft (6) and the conductive push plate (7) are fixed and electrically connected. The other end of the conductive push plate (7) has a motion guide groove (7a) that movably cooperates with the limiting head (4b). The middle part of the conductive push plate (7) has a contact point one (7c). The electrical positive pin (3) has a contact point two (3a) that cooperates with the contact point one (7c). One end of the spring (8) is fixed inside the lower housing (5), and the other end of the spring (8) abuts against the other end of the conductive push plate (7).

2. The highly reliable micro switch according to claim 1, characterized in that, The shape of the spring piece (8) is parabolic.

3. The highly reliable micro switch according to claim 1, characterized in that, The other end of the spring (8) also has an avoidance notch (8a).

4. A highly reliable micro switch according to claim 1, characterized in that, The metal shaft (6) has an auxiliary groove (6a), and one end of the conductive push plate (7) has a connector (7b) that fits tightly with the auxiliary groove (6a).

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