Dustproof touch switch

Abstract

The utility model discloses a dustproof touch switch which structurally comprises a base, an opening is formed in the upper portion of the base, a containing cavity is formed in the upper portion of the base, a center terminal, a contact elastic piece and an outer terminal are arranged at the bottom in the containing cavity, the contact elastic piece makes contact with the outer terminal in an attached mode, an assembly step is formed at the upper opening end of the containing cavity, and a protective cover is arranged at the upper opening end of the containing cavity. A protective film is arranged on the assembly step, the protective film is limited and fixed when the protective cover is installed, and a key assembly is further arranged on the protective cover.

Description

Technical Field

[0001] The utility model relates to the technical field of light touch switches, and more specifically to a dustproof light touch switch. Background Art

[0002] A touch switch is an electronic switch that belongs to the category of electronic components. It has the advantages of small contact resistance, precise operating force error, and diversified specifications, and is widely used in electronic equipment and white appliances.

[0003] The touch switches currently on the market, for example, a shockproof and anti-falling touch switch button disclosed in a Chinese patent with a publication (announcement) number of CN214336610U, include a base, a switch assembly is arranged in the base, a top cover is arranged on the top of the base, and a button assembly is arranged on the top cover, a movable hole is penetrated through the top surface of the top cover, and the movable hole is matched and connected with the button assembly, and the button assembly includes a button cap, and the button cap passes through the movable hole; the top surface of the top cover 2 of the shockproof and anti-falling touch switch button is penetrated by an movable hole 22, and the movable hole 22 is matched and connected with the button assembly, so there is a matching gap between the button cap 3 and the top cover, so that moisture, dust or powder in the air can easily enter the switch from the above gap, causing a short circuit in the circuit, resulting in malfunction of the touch switch, affecting its normal use, so the touch switch of the traditional structure has some safety hazards. Utility Model Content

[0004] In view of the shortcomings of the prior art, the purpose of the utility model is to provide a dustproof touch switch to solve the above technical problems.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a dustproof touch switch, comprising a base, the upper part of the base is open and formed with a cavity, the bottom of the cavity has a central terminal, a contact spring and an outer terminal, the contact spring is in close contact with the outer terminal, an assembly step is formed at the upper open end of the cavity and a protective cover is provided, a protective film is provided on the assembly step and the protective cover is limited and fixed to the protective film when installed, and a button assembly is also provided on the protective cover.

[0006] The utility model is further configured as follows: the center of the protective film has an upwardly protruding arc structure, the protective cover is adapted to the upper opening end of the cavity and has a protrusion adapted to the assembly step, and the protrusion presses and fixes the protective film when the protective cover is installed.

[0007] The utility model is further configured as follows: a pressing convex ring is provided on the lower end surface of the protruding portion at a position corresponding to the assembly step.

[0008] The utility model is further configured as follows: the button assembly comprises a through hole opened at the center of the protective cover and a button movably arranged in the through hole.

[0009] The utility model is further configured as follows: an installation step extends from the upper open end of the through hole and a limit cover is arranged on the installation step, the limit cover and the installation step are detachably connected by threaded cooperation, a receiving groove is opened at the lower end of the limit cover and a matching hole is provided on the top wall of the receiving groove, the button comprises a sliding part adapted to the through hole, a limiting part adapted to the receiving groove, a pressing part penetrating the through hole and extending to the top of the limit cover, and a plurality of groups of butterfly-shaped spring pieces opposing each other are arranged on the outer ring of the sliding part.

[0010] The utility model is further configured as follows: a metal cover plate is arranged above the protective cover, the outer side of the metal cover plate is bent downward along the edge of the protective cover, a plurality of fixing ears are distributed below the bent section of the metal cover plate and the fixing ears are provided with clamping holes, a clamping block is arranged at the corresponding position of each clamping hole on the outer side wall of the base, and a matching inclined waist is arranged on the top of the outer side surface of the clamping block.

[0011] The utility model is further configured as follows: a first pin is arranged on the left side of the base and a second pin is arranged on the right side, the first pin is conductively connected to the outer terminal and the second pin is conductively connected to the central terminal.

[0012] In summary, the utility model has the following beneficial effects: the protective film is placed on the assembly step, and then the protective cover is installed. When the protective cover is installed, the protective film is limited and fixed. By setting the protective film, good sealing is provided for the touch switch, which effectively prevents moisture, dust or powder in the air from entering the interior of the touch switch, thereby improving the service life of the touch switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0014] Figure 2 for Figure 1 A schematic diagram of the enlarged local structure at point A in the middle. DETAILED DESCRIPTION

[0015] The utility model is further described below in conjunction with the accompanying drawings:

[0016] Referring to the accompanying drawings: This dustproof touch switch includes a base 1, the upper part of the base 1 is open and formed with a cavity 10, the bottom of the cavity 10 has a central terminal 11, a contact spring 12 and an external terminal 13, the contact spring 12 is in close contact with the external terminal 13, the upper open end of the cavity 10 is formed with an assembly step 2 and a protective cover 20 is provided, the assembly step 2 is provided with a protective film 21 and the protective cover 20 is installed to limit and fix the protective film 21, and a button assembly is also provided on the protective cover 20.

[0017] When in use, the protective film 21 is placed on the assembly step 2, and then the protective cover 20 is installed. When the protective cover 20 is installed, the protective film 21 is limited and fixed. By setting the protective film 21, good sealing is provided for the touch switch, which effectively prevents moisture, dust or powder in the air from entering the inside of the touch switch, thereby increasing the service life of the touch switch.

[0018] There is a matching gasket between the two external terminals 13, and the upper surface of the matching gasket is in close contact with the edge of the lower surface of the contact spring 12;

[0019] Among them, an insulating gasket is arranged on the central terminal 11, and a receiving area adapted to the insulating gasket is provided at the center of the matching gasket to limit the position of the insulating gasket. The insulating gasket is provided with a plurality of receiving holes and the cross-section of the receiving holes is a frustum-shaped structure. A contact protrusion is arranged at the corresponding position of each receiving hole of the central terminal 11. The contact protrusion is adapted to the size of the receiving hole and the height is slightly lower than the receiving hole. When working, the contact spring 12 is bent and pressed against the insulating gasket through the key assembly. The contact spring 12 causes the insulating gasket to be compressed and deformed until it is against the contact protrusion, thereby turning on the circuit. By setting the insulating gasket, it is prevented that the spring sheet fails due to repeated pressing and mistakenly contacts the center contact, which affects the normal use of the switch.

[0020] The center of the protective membrane 21 has an upwardly protruding arc structure. The protective cover 20 is adapted to the upper open end of the cavity 10 and has a protrusion 22 adapted to the assembly step 2. When the protective cover 20 is installed, the protrusion 22 presses and fixes the protective membrane 21; the lower end surface of the protrusion 22 is located at the corresponding position of the assembly step 2 and has a clamping convex ring 23.

[0021] When in use, the raised portion 22 of the protective cover 20 is installed to press and fix the protective film 21 , and the pressing convex ring 23 can further improve the limiting effect of the protective cover 20 on the protective film 21 .

[0022] The button assembly includes a through hole 3 opened at the center of the protective cover 20 and a button 4 movably arranged in the through hole 3; an installation step 30 extends from the open end of the through hole 3 and a limit cover 31 is arranged on the installation step 30, the limit cover 31 and the installation step 30 are detachably connected by threaded cooperation, a receiving groove 32 is opened at the lower end of the limit cover 31 and the inner top wall of the receiving groove 32 has a matching hole, the button 4 includes a sliding part 40 adapted to the through hole 3, a limiting part 41 adapted to the receiving groove 32, and a pressing part 42 that passes through the through hole 3 and extends to the top of the limit cover 31, and the outer ring of the sliding part 40 is provided with a plurality of groups of butterfly spring pieces 43 that are opposite to each other.

[0023] When in use, the limiting cover 31 and the mounting step 30 are detachably connected by threaded matching. Specifically, the lower portion of the outer circumference of the limiting cover 31 has an external thread, and the inner circumference of the mounting step 30 has an internal thread, so as to realize the detachable connection between the limiting cover 31 and the mounting step 30;

[0024] During operation, the pressing portion 42 is pressed downward and the limiting portion 41 is forced to move radially downward along the accommodating groove 32. While the limiting portion 41 moves downward, it presses each group of butterfly spring pieces 43 and makes each group of butterfly spring pieces 43 in a compressed energy storage state. The limiting portion 41 drives the sliding portion 40 to move downward along the through hole 3 and causes the protective film 21 and the matching spring pieces to be compressed and deformed, thereby turning on the circuit; when it is necessary to disconnect the circuit, the pressing force on the button 4 is cancelled, and the matching spring pieces, the protective film 21 and the groups of butterfly spring pieces 43 jointly cause the button 4 to retreat to the initial position, completing the circuit disconnection.

[0025] A metal cover plate 5 is arranged above the protective cover 20, and the outer side of the metal cover plate 5 is bent downward along the edge of the protective cover 20. A plurality of fixing ears 50 are distributed below the bent section of the metal cover plate 5, and the fixing ears 50 are provided with clamping holes 51. A clamping block 52 is arranged on the outer wall of the base 1 at a position corresponding to each clamping hole 51, and a matching oblique waist 53 is arranged on the top of the outer side surface of the clamping block 52.

[0026] When in use, after the protective cover 20 is pushed into the upper opening of the base 1 and the protective film 21 is pressed, the metal cover plate 5 is installed. The metal cover plate 5 is clamped on the installation base 1 through the limit between each fixing ear 50 and the clamping block 52 to complete the fixed installation. When the metal cover plate 5 is installed, the protective cover 20 is fixed;

[0027] Specifically, when the protective cover 20 is installed, the fixing ear 50 is forced to contact the oblique waist 53 of the clamping block 52 and bend outward until the position of the clamping hole 51 corresponds to the clamping block 52, and the installation of the protective cover 20 is completed.

[0028] A first pin 6 is disposed on the left side of the base 1 and a second pin 60 is disposed on the right side. The first pin 6 is conductively connected to the outer terminal 13 and the second pin 60 is conductively connected to the central terminal 11 .

[0029] When in use, the first pin 6 and the second pin 60 are both made of phosphor copper.

[0030] Although the present invention has been shown and described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein within the scope of the claims.

Claims

1. A dustproof touch switch, comprising a base (1), characterized in that: The base (1) is open at the top and is formed with a cavity (10); the bottom of the cavity (10) is provided with a central terminal (11), a contact spring (12) and an outer terminal (13); the contact spring (12) is in close contact with the outer terminal (13); an assembly step (2) is formed at the upper open end of the cavity (10) and is provided with a protective cover (20); a protective film (21) is provided on the assembly step (2) and the protective cover (20) limits and fixes the protective film (21) when in an installed state; and a key assembly is also provided on the protective cover (20).

2. The dustproof touch switch according to claim 1, characterized in that: The center of the protective film (21) has an upwardly protruding arc structure, the protective cover (20) is adapted to the upper opening end of the cavity (10) and has a protrusion (22) adapted to the assembly step (2), and when the protective cover (20) is in the installed state, the protrusion (22) presses and fixes the protective film (21).

3. The dustproof touch switch according to claim 2, characterized in that: The lower end surface of the raised portion (22) is provided with a clamping convex ring (23) at a position corresponding to the assembly step (2).

4. The dustproof touch switch according to claim 1, characterized in that: The button assembly comprises a through hole (3) opened at the center of the protective cover (20) and a button (4) movably arranged in the through hole (3).

5. The dustproof touch switch according to claim 4, characterized in that: An installation step (30) extends from the upper open end of the through hole (3) and a limit cover (31) is arranged on the installation step (30); the limit cover (31) and the installation step (30) are detachably connected by threaded matching; a receiving groove (32) is opened at the lower end of the limit cover (31) and a matching hole is arranged on the inner top wall of the receiving groove (32); the button (4) comprises a sliding part (40) adapted to the through hole (3), a limit part (41) adapted to the receiving groove (32), and a pressing part (42) penetrating the through hole (3) and extending to the upper part of the limit cover (31); and a plurality of butterfly-shaped spring pieces (43) facing each other are sleeved on the outer ring of the sliding part (40).

6. The dustproof touch switch according to claim 1, characterized in that: A metal cover plate (5) is arranged above the protective cover (20), the outer side of the metal cover plate (5) is bent downward along the edge of the protective cover (20), a plurality of fixing ears (50) are distributed below the bent section of the metal cover plate (5), and the fixing ears (50) are provided with a clamping hole (51), and a clamping block (52) is arranged on the outer side wall of the base (1) at a position corresponding to each clamping hole (51), and a matching oblique waist (53) is provided on the top of the outer side surface of the clamping block (52).

7. The dustproof touch switch according to claim 1, characterized in that: The base (1) is provided with a first pin (6) on the left side and a second pin (60) on the right side, the first pin (6) being conductively connected to the outer terminal (13) and the second pin (60) being conductively connected to the central terminal (11).

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