Metal and rubber composite electric contact

Abstract

The utility model discloses a metal and rubber composite electric contact, which comprises an annular base, a key part is arranged at the upper part of the middle of the annular base, a diaphragm is connected between the key part and the annular base, a contact part is fixedly arranged at the lower part of the key part, a first through hole penetrates through the contact part, and a second through hole penetrates through the first through hole. A second through hole is formed in the key part in a penetrating mode, a transparent plastic cover embedded into the key part is arranged at the upper end of the second through hole, dust and other impurities can be prevented from entering the first through hole through the transparent plastic cover, the conductivity of the contact part is prevented from being affected, and meanwhile the transparent plastic cover can improve the use comfort of the key part. Due to the existence of the bulges, an anti-skid effect can be achieved; the limiting rod and the limiting pipe can play a role in limiting the key part, and it is guaranteed that the key part can accurately drive the contact part downwards; the reset elasticity of the key part can be improved due to the existence of the spring, so that the key part can be reset more quickly and effectively.

Description

Technical Field

[0001] This utility model relates to the field of composite electrical contacts, specifically to a composite electrical contact made of metal and rubber. Background Technology

[0002] Rubber buttons are commonly used in electronic calculators, remote controls, telephones, cordless telephones, electronic toys, computer keyboards, educational machines, password generators, barcode scanners, vehicles, and industrial and medical products. Various rubber buttons typically contain one or more electrical contacts (or "conductive particles") with electrical conductivity. When a button is pressed, the electrical contact makes contact with the paired PCB gold fingers, gold dots (such as double crescent-shaped gold dots), or conductive pads, achieving electrical continuity and forming a circuit. When the button is released, the electrical contact springs back, disconnecting from the circuit.

[0003] In existing technologies, although composite electrical contacts made of metal and rubber can provide good electrical conductivity, their application is limited due to the opacity of the metal layer and the opacity or semi-transparency of the rubber layer. This is because in many situations, the light emitted from the light source on the circuit board needs to reach the keycaps and then, through the keycaps (such as transparent plastic keycaps), reach the person operating the keycaps.

[0004] Chinese utility model patent application number 202223506490.1 proposes a composite electrical contact made of metal and rubber to solve the above problems, but it still has some shortcomings: due to the existence of its through hole, although light can pass through, it is also possible for part of the flesh of the finger to be embedded in the through hole, causing the edge of the through hole to squeeze the finger. This can lead to hand discomfort after long-term use. Moreover, dust and other impurities may enter the through hole, causing impurities to accumulate, which not only affects the conductivity of the contact, but also makes the button look particularly dirty and difficult to clean.

[0005] Accordingly, this utility model proposes a composite electrical contact made of metal and rubber to solve the above problems. Utility Model Content

[0006] To overcome the shortcomings of the prior art, this utility model provides a composite electrical contact made of metal and rubber. The transparent plastic cover prevents dust and other impurities from entering the first through hole, thus avoiding affecting the conductivity of the contact. At the same time, the transparent plastic cover can improve the comfort of the button and the protrusion can provide an anti-slip effect. The presence of the limiting rod and limiting tube can limit the button and ensure that the button can accurately drive the contact downward. The presence of the spring can improve the reset elasticity of the button, making the button reset more quickly and effectively.

[0007] Technical solution

[0008] A composite electrical contact of metal and rubber includes an annular base, a button portion is provided in the upper middle part of the annular base, a diaphragm is connected between the button portion and the annular base, a contact portion is fixedly provided in the lower part of the button portion, a first through hole is provided in the contact portion, a second through hole is provided in the button portion, and a transparent plastic cover is provided at the upper end of the second through hole and embedded in the button portion.

[0009] Furthermore, the upper surface of the button portion is provided with protrusions to increase friction.

[0010] Furthermore, the annular base has an internal skeleton.

[0011] Furthermore, a connecting plate located on the lower side of the diaphragm is fixedly connected to the skeleton.

[0012] Furthermore, a limit tube is provided inside the button section, and a limit rod that can extend into the limit tube is fixedly connected to the connecting plate.

[0013] Furthermore, a spring is fixedly connected between the upper end of the limiting rod and the top inner wall of the limiting tube.

[0014] Beneficial effects

[0015] Compared with the prior art, this utility model has the following advantages:

[0016] The transparent plastic cover prevents dust and other impurities from entering the first through hole, thus avoiding affecting the conductivity of the contact area. At the same time, the transparent plastic cover also improves the comfort of using the button, and the raised part provides an anti-slip effect. The presence of the limit rod and limit tube can limit the button, ensuring that the button can accurately drive the contact area downward. The presence of the spring can improve the reset elasticity of the button, making the button reset more quickly and effectively. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a composite electrical contact made of metal and rubber according to this utility model.

[0018] Attached icon number

[0019] 1. Ring base; 2. Frame; 3. Diaphragm; 4. Button part; 5. Second through hole; 6. Transparent plastic cover; 7. Protrusion; 9. Limiting tube; 10. Spring; 11. Limiting rod; 12. Contact part; 13. First through hole; 14. Connecting plate. Detailed Implementation

[0020] To better illustrate the content of this utility model, the following description is provided in conjunction with the accompanying drawings and embodiments:

[0021] have Figure 1 As shown, this utility model discloses a composite electrical contact of metal and rubber, including an annular base 1. A button part 4 is provided in the upper middle part of the annular base 1. A diaphragm 3 is connected between the button part 4 and the annular base 1. A contact part 12 is fixedly provided in the lower part of the button part 4. A first through hole 13 is provided through the contact part 12. A second through hole 5 is provided through the button part 4. A transparent plastic cover 6 is provided at the upper end of the second through hole 5 and embedded in the button part 4.

[0022] Furthermore, the upper surface of the button part 4 is provided with protrusions 7 for increasing friction.

[0023] Furthermore, the annular base 1 is provided with a frame 2 inside.

[0024] Furthermore, a connecting plate 14 located on the lower side of the diaphragm 3 is fixedly connected to the frame 2.

[0025] Furthermore, a limiting tube 9 is provided inside the button part 4, and a limiting rod 11 that can extend into the limiting tube 9 is fixedly connected to the connecting plate 14.

[0026] Furthermore, a spring 10 is fixedly connected between the upper end of the limiting rod 11 and the top inner wall of the limiting tube 9.

[0027] Furthermore, the annular base 1, the button part 4, and the diaphragm 3 are all made of rubber.

[0028] Specifically, the transparent plastic cover 6 can prevent dust and other impurities from entering the first through hole 13 and thus avoid affecting the conductivity of the contact part 12. At the same time, the transparent plastic cover 6 can also improve the comfort of using the button part 4, and the presence of the protrusion 7 can play a role in preventing slippage.

[0029] Since the diaphragm 3 is only elastic, it does not have a good effect on vertical positioning, which may cause the button part 4 to swing sideways. The presence of the limiting rod 11 and the limiting tube 9 can limit the button part 4, ensuring that the button part 4 can accurately drive the contact part 12 downward.

[0030] Meanwhile, the diaphragm 3 is a rubber layer, which has limited elasticity and is easily damaged. The presence of the spring 10 can improve the reset elasticity of the button part 4, making the button part 4 reset more quickly and effectively.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the technical solutions of this utility model have been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of this utility model.

Claims

1. A metal and rubber composite electrical contact, characterized by: The application relates to a key, which comprises a ring-shaped base (1), a key part (4) arranged on the upper middle part of the ring-shaped base (1), a diaphragm (3) connected between the key part (4) and the ring-shaped base (1), a contact part (12) fixedly arranged on the lower part of the key part (4), a first through hole (13) penetrating through the contact part (12), a second through hole (5) penetrating through the key part (4), and a transparent plastic cover (6) embedded in the key part (4) and arranged on the upper end of the second through hole (5).

2. A metal and rubber composite electrical contact according to claim 1, wherein: The upper surface of the key part (4) is provided with a convex part (7) for increasing friction.

3. A metal and rubber composite electrical contact as defined in claim 2, wherein: The inside of the ring-shaped base (1) is provided with a framework (2).

4. A metal to rubber composite electrical contact as defined in claim 3, wherein: The framework (2) is fixedly connected with a connecting plate (14) arranged on the lower side of the diaphragm (3).

5. A metal to rubber composite electrical contact as defined in claim 4 wherein: The inside of the key part (4) is further provided with a limiting tube (9), and the connecting plate (14) is fixedly connected with a limiting rod (11) capable of extending into the limiting tube (9).

6. A metal to rubber composite electrical contact as defined in claim 5, wherein: The upper end of the limiting rod (11) is fixedly connected with a spring (10) between the top inner wall of the limiting tube (9).

Images