A normally closed microswitch

Abstract

The utility model discloses a normally closed type microswitch, including base, first terminal, second terminal, reed, apron and button, the apron is fixed on the base upper end and is equipped with the perforation of the button to pass in the apron, and the first terminal and second terminal are fixed on the base, and have the first contact and second contact of the inner chamber of the extension into the base respectively, the reed is installed in the inner chamber, and the reed is contacted with the first contact and second contact simultaneously under normal state, the inner chamber bottom wall is integrally provided with the fulcrum boss that protrudes upward in the position of being close to the first contact, when the button is pressed, the reed is pressed to the downward pressure, makes the reed close to the first contact one end to the fulcrum boss as the fulcrum and go up, thereby and the first contact separate, the normally closed type microswitch structure in the utility model is optimized design, simple structure, action more reliable, longer life and lower manufacturing cost, have good practicality.

Description

Technical Field

[0001] This utility model belongs to the field of electrical switch structure design, specifically relating to a normally closed tactile switch. Background Technology

[0002] As a common basic electronic component, tactile switches are widely used in consumer electronics, home appliances, industrial control and communication equipment, providing users with an interactive method to turn circuits on and off by briefly pressing them.

[0003] A typical normally closed tactile switch includes a base, two terminals fixed to the base, a resiliently reset spring, and a button. Under normal conditions, the spring is in contact with both terminals simultaneously, making the circuit continuous. When the button is pressed, the button causes the spring to deform, separating it from one of the contacts, thus breaking the circuit.

[0004] However, existing normally closed tactile switches of this type have some design and performance shortcomings. To achieve stable and reliable reed separation, traditional structures are often designed to be quite complex. For example, some solutions use a convex bulge or specific bending structure in the middle of the reed, combined with a complex limiting structure within the base, to achieve a "seesaw"-like lever motion. This structure not only increases the difficulty and cost of mold design and production, but also places higher demands on the precision and consistency of the reed stamping process; even slight dimensional deviations can lead to malfunctions or poor contact. Utility Model Content

[0005] In response, this utility model provides a normally closed tactile switch that is simple in structure, reliable in operation, long in life and low in manufacturing cost.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] This utility model provides a normally closed tactile switch, including a base, a first terminal, a second terminal, a spring, a cover plate, and a button. The cover plate is fixed to the upper end of the base and has a through hole for the button to pass through. The first terminal and the second terminal are fixed to the base and have a first contact and a second contact extending into the inner cavity of the base, respectively. The spring is installed in the inner cavity and, under normal conditions, the spring is in contact with the first contact and the second contact simultaneously. An upwardly protruding fulcrum is integrally provided on the bottom wall of the inner cavity near the first contact. When the button is pressed down, downward pressure is applied to the spring, causing the end of the spring near the first contact to tilt upward with the fulcrum as a fulcrum, thereby separating from the first contact.

[0008] Preferably, the reed is a disc-shaped reed with its center arched upwards; the reed is made of stainless steel.

[0009] Preferably, the fulcrum boss is located between the center of the inner bottom wall of the cavity and the first contact point, and the fulcrum boss is elongated and its length direction is perpendicular to the line connecting the first contact point and the second contact point.

[0010] Preferably, the button is made of plastic, and a silicone sheet is provided between the button and the spring. The periphery of the silicone sheet is pressed between the base and the cover plate, and the lower center of the silicone sheet contacts the center of the spring.

[0011] Preferably, the upper and lower surfaces of the central portion of the silicone sheet are provided with protrusions.

[0012] Preferably, the button is made of silicone, and the button has an integrally formed flange that protrudes radially outward. The flange is pressed between the base and the cover plate, and the lower end of the button contacts the center of the upper end of the spring.

[0013] Preferably, the upper surface of the base has upward protruding protrusions at the four corners, and the upper surface of the cover plate has recessed grooves at the four corners. A positioning hole for the protrusions to pass through is provided in the groove. After the protrusions pass through the positioning holes, they are riveted to form a limiting end for fixing the cover plate.

[0014] The positive effects of this utility model are as follows: The normally closed tactile switch structure of this utility model has been optimized by setting a fulcrum protrusion on the base. This structure provides a stable and clear physical fulcrum, and uses the lever principle to make the reed move precisely when pressed. This simplifies the product structure, eliminates the need for complex reed shapes or additional guide components, and simplifies the mold structure, reducing processing and assembly costs. Moreover, it ensures the consistency of action, so that the reed separates from the first contact point with the same trajectory and timing with each press, thus improving the reliability of electrical performance. Attached Figure Description

[0015] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art are briefly introduced below. Similar elements or parts in the drawings are generally identified by similar reference numerals. The elements or parts in the drawings are not necessarily drawn to scale.

[0016] Figure 1 This is a perspective view of the first normally closed tactile switch of this utility model.

[0017] Figure 2 for Figure 1 An exploded view of the normally closed tactile switch shown.

[0018] Figure 3 for Figure 1The diagram shows the structure of the base in the normally closed tactile switch.

[0019] Figure 4 This is an exploded view of the second normally closed tactile switch of this utility model.

[0020] The reference numerals in the figure are as follows: 1. Base; 11. Pivot boss; 12. Protrusion; 2. First terminal; 21. First contact; 3. Second terminal; 31. Second contact; 4. Spring; 5. Cover plate; 51. Through hole; 52. Groove; 53. Positioning hole; 6. Button; 61. Flange; 7. Silicone sheet. Detailed Implementation

[0021] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0022] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application shall have the ordinary meaning as understood by one of ordinary skill in the art to which this utility model pertains.

[0023] Example 1

[0024] The normally closed tactile switch structure of this utility model embodiment is as follows: Figures 1 to 4 As shown, it includes a base 1, a first terminal 2, a second terminal 3, a spring 4, a cover plate 5, and a button 6. The cover plate 5 is fixed to the upper end of the base 1 and has a through hole 51 for the button 6 to pass through. The first terminal 2 and the second terminal 3 are fixed to the base 1 and have a first contact 21 and a second contact 31 extending into the inner cavity of the base 1, respectively. The spring 4 is installed in the inner cavity and, under normal conditions, the spring 4 is in contact with the first contact 21 and the second contact 31 simultaneously. An upwardly protruding fulcrum 11 is integrally provided on the bottom wall of the inner cavity near the first contact 21. When the button 6 is pressed down, downward pressure is applied to the spring 4, causing the end of the spring 4 near the first contact 21 to tilt upward with the fulcrum 11 as the fulcrum, thereby separating from the first contact 21. In this embodiment, a fulcrum boss 11 is provided on the base 1. This structure provides a stable and clear physical fulcrum, and uses the lever principle to make the spring 4 move precisely when pressed. This simplifies the product structure, eliminates the need for complex spring 4 shapes or additional guide components, and simplifies the mold structure, reducing processing and assembly costs. Moreover, it ensures the consistency of the action, so that the spring 4 can separate from the first contact point 21 with the same trajectory and timing each time it is pressed, thus improving the reliability of electrical performance.

[0025] See Figure 3As shown, the fulcrum boss 11 is preferably located between the center of the bottom wall of the inner cavity and the first contact 21. The fulcrum boss 11 is elongated and its length direction is perpendicular to the line connecting the first contact 21 and the second contact 31. This design can provide a stable "line contact" fulcrum for the reed, ensuring reliable tilting action when the reed is pressed when the button controls the tactile switch to disconnect.

[0026] In this embodiment, the spring 4 is a disc-shaped piece with its center arched upwards. When compressed, the spring 4 undergoes elastic deformation and stores energy. When the pressure is released, the structure can provide a strong, rapid, and vertically upward rebound force based on its own elasticity, ensuring that the spring 4 can quickly return to its initial contact state and guaranteeing the rapid reset of the switch. Preferably, the spring 4 is made of stainless steel.

[0027] like Figure 3 As shown, the button 6 is made of plastic. A silicone sheet 7 is provided between the button 6 and the spring 4. The periphery of the silicone sheet 7 is pressed between the base 1 and the cover plate 5. The center of the lower end of the silicone sheet 7 contacts the center of the spring 4. In this design, the silicone sheet 7 can fill the assembly gap between the base 1 and the cover plate 5, forming a reliable sealing barrier. This effectively prevents contaminants such as moisture, humidity, and dust from entering the switch cavity, significantly improving the switch's waterproof and dustproof rating. Moreover, the pressure protrusion at the lower end of the silicone sheet 7 applies a continuous pre-pressure to the center of the spring 4 under normal conditions, ensuring that the spring 4 is fixed in position when not pressed and will not move slightly due to equipment vibration or accidental shaking, thereby ensuring the reliability of the circuit.

[0028] Furthermore, the silicone sheet 7 has protrusions on the upper and lower surfaces of its center. The lower protrusion contacts the upper center of the spring 4, while the upper protrusion abuts against the lower end of the button 6. In this way, the protrusions concentrate the pressure applied by the button 6 onto the center of the spring 4, ensuring that each press generates sufficient and vertical force to drive the spring 4 to tilt stably around the fulcrum protrusion 11, thereby improving the reliability of the contact disconnection action.

[0029] Furthermore, the upper surface of the base 1 has upward-protruding protrusions 12 at the four corners, and the upper surface of the cover plate 5 has recessed grooves 52 at the four corners. Positioning holes 53 are provided through the grooves 52 for the protrusions 12 to pass through. After passing through the positioning holes 53, the protrusions 12 are riveted to form a limiting end for fixing the cover plate 5. The cooperation between the protrusions 12 and the positioning holes 53 ensures precise alignment during assembly, improving production efficiency. After assembly, the riveted limiting end firmly locks the cover plate 5 onto the base 1, forming a structurally stable whole that can effectively resist external impacts and vibrations, prevent loosening after long-term use, and ensure the overall structural integrity and long-term stability of the product. At the same time, the design of the limiting end hidden within the grooves 52 also makes the product appearance smoother and more aesthetically pleasing.

[0030] Example 2

[0031] This embodiment is basically the same as Embodiment 1, except that, see below. Figure 4 As shown, in this embodiment, the button 6 is made of silicone. The button 6 has an integrally formed flange portion 61 that protrudes radially outward. The flange portion 61 is pressed between the base 1 and the cover plate 5. The lower end of the button 6 is in contact with the center of the upper end of the spring 4. In this embodiment, the flange portion 61 can seal the assembly gap between the base 1 and the cover plate 5, thereby enhancing the protection level of the switch. Moreover, the button 6 is made entirely of silicone, and the inherent flexibility of silicone provides a good tactile feel for the pressing operation.

[0032] For those skilled in the art, other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, these obvious variations or modifications derived from the essential spirit of this invention still fall within the protection scope of this invention.

Claims

1. A normally closed tactile switch, comprising a base (1), a first terminal (2), a second terminal (3), a spring (4), a cover plate (5), and a button (6); the cover plate (5) is fixed to the upper end of the base (1) and has a through hole (51) for the button (6) to pass through; the first terminal (2) and the second terminal (3) are fixed to the base (1) and respectively have a first contact (21) and a second contact (31) extending into the inner cavity of the base (1); the spring (4) is installed in the inner cavity and, under normal conditions, the spring (4) is in contact with the first contact (21) and the second contact (31) simultaneously; characterized in that, On the inner bottom wall of the cavity, near the first contact point (21), there is an integrally formed upward protruding fulcrum boss (11); when the button (6) is pressed down, it applies downward pressure to the spring (4), causing the end of the spring (4) near the first contact point (21) to tilt upward with the fulcrum boss (11) as the fulcrum, thereby separating from the first contact point (21).

2. The normally closed tactile switch according to claim 1, characterized in that, The reed (4) is a disc-shaped piece with the center arched upwards; the reed (4) is made of stainless steel.

3. The normally closed tactile switch according to claim 1, characterized in that, The fulcrum boss (11) is located between the center of the inner bottom wall of the cavity and the first contact point (21). The fulcrum boss (11) is elongated and its length direction is perpendicular to the line connecting the first contact point (21) and the second contact point (31).

4. The normally closed tactile switch according to claim 1, characterized in that, The button (6) is made of plastic. A silicone sheet (7) is provided between the button (6) and the spring (4). The periphery of the silicone sheet (7) is pressed between the base (1) and the cover plate (5). The lower center of the silicone sheet (7) is in contact with the center of the spring (4).

5. The normally closed tactile switch according to claim 4, characterized in that, The silicone sheet (7) has protrusions on the upper and lower surfaces of its central part.

6. The normally closed tactile switch according to claim 1, characterized in that, The button (6) is made of silicone. The button (6) is integrally provided with a flange (61) that protrudes outward in a radial direction. The flange (61) is pressed between the base (1) and the cover plate (5). The lower end of the button (6) is in contact with the center of the upper end of the spring (4).

7. The normally closed tactile switch according to claim 1, characterized in that, The base (1) has protruding protrusions (12) at the four corners on the upper surface of the base (1), and recessed grooves (52) at the four corners on the upper surface of the cover plate (5). A positioning hole (53) is provided in the groove (52) for the protrusions (12) to pass through. After the protrusions (12) pass through the positioning hole (53), they are riveted to form a limiting end for fixing the cover plate (5).

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