A push switch

Abstract

This utility model provides a push-button switch, including an insulating base, a cover plate, and a button. The insulating base has a switch chamber, and also includes a stationary contact and a moving contact. A portion of the stationary contact extends into the switch chamber, and another portion extends outside the insulating base. It also includes a mounting base, on which the moving contact is linked. A dome switch is located below the mounting base, and a smooth hard pad is located below the dome switch. The outer periphery of the dome switch abuts against the upper surface of the hard pad. The advantages of this utility model are: by providing a smooth hard pad below the dome switch, friction loss is reduced, ensuring a consistent pressing feel; simultaneously, by optimizing the fixing method of the moving contact, long-term reliability is improved. This utility model has a compact structure, is easy to assemble, and is suitable for mass production.

Description

Technical Field

[0001] This utility model belongs to the field of switch technology, specifically a push switch. Background Technology

[0002] In existing push-button switches, the dome switch typically rests directly against the plastic bottom wall of the switch chamber. After repeated pressing over a long period, the plastic bottom wall is prone to wear and tear, resulting in dents or increased surface roughness. This leads to a decrease in the dome switch's rebound feel, unstable contact resistance, and even button failure. Furthermore, the fixed end of the moving contact may loosen or shift during long-term use, affecting the switch's conductivity reliability. Utility Model Content

[0003] The purpose of this invention is to provide a push-button switch that addresses the problems of easy wear of the dome contact area and insufficient stability of the fixed end of the moving contact in existing switches.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A push-button switch includes an insulating base, a cover plate, and a button. The insulating base has a switch chamber and also includes a stationary contact and a moving contact. A portion of the stationary contact extends into the switch chamber, and another portion extends out of the insulating base. The switch also includes a mounting base, on which the moving contact is coupled. A dome switch is located below the mounting base, and a smooth hard pad is located below the dome switch. The outer periphery of the dome switch abuts against the upper surface of the hard pad.

[0006] Preferably, the switch chamber is provided with a groove, and the hard pad and the dome switch are disposed in the groove, wherein the hard pad is a metal sheet.

[0007] Preferably, the rigid pad is made of stainless steel.

[0008] Preferably, the movable contact piece includes a fixed section and a movable section, and the button is integrally provided with a protrusion that presses down on the fixed section of the movable contact piece, so that the fixed section of the movable contact piece is in a fixed state for a long time.

[0009] Preferably, the movable contact includes a fixed section and a movable section, and a pressure plate is provided between the button and the fixed section of the movable contact. The pressure plate fills the gap between the button and the movable contact, so that the fixed section of the movable contact is in a fixed state for a long time.

[0010] Preferably, the hard pad is an annular thin sheet, and the bottom surface of the corresponding groove is provided with a protruding post. The hard pad is sleeved on the protruding post. The outer periphery of the hard pad is provided with an outwardly protruding locking protrusion, and the inner arm of the groove is provided with a locking groove that is embedded in the locking protrusion of the hard pad.

[0011] Preferably, the movable contact piece is fixed or injection molded as a single unit with the mounting base, and a limiting device is provided in the insulating base to restrict the horizontal movement of the fixed section of the movable contact piece.

[0012] Preferably, the limiting device is a plurality of protrusions on the inner bottom of the switch chamber, which together with the inner wall of the switch chamber restrict the horizontal movement of the fixed section of the moving contact piece.

[0013] Preferably, the button includes a flat portion and a cylindrical portion, the cover plate is disposed above the button and presses against the flat portion of the button, the cover plate is provided with a through hole for the cylindrical portion of the button to extend out, the button partially extends outside the cover plate, and a snap-fit ​​device is provided between the cover plate and the insulating base.

[0014] Preferably, the latching device includes: a latching edge disposed on the edge of the cover plate and extending toward one side of the insulating base, and a latch protruding from the side of the insulating base, wherein the latching edge is provided with a latching hole for engaging with the latch, the latching edge is provided on at least two opposite sides of the cover plate, and the number and position of the latches correspond to the latching edge.

[0015] The beneficial effects of this invention are: by setting a smooth, hard pad under the dome switch, friction loss is reduced, ensuring a consistent pressing feel; at the same time, by optimizing the fixing method of the moving contact piece, long-term reliability is improved. This invention has a compact structure, is easy to assemble, and is suitable for mass production. Attached Figure Description

[0016] Figure 1 This is a perspective view of Embodiment 1 of the present utility model;

[0017] Figure 2 This is an exploded view of the structure of Embodiment 1 of this utility model;

[0018] Figure 3 This is a schematic diagram of the button structure according to Embodiment 1 of this utility model;

[0019] Figure 4 This is a schematic diagram of the insulating base in Embodiment 1 of this utility model;

[0020] Figure 5 This is an exploded view of the structure of Embodiment 2 of this utility model.

[0021] Explanation of reference numerals in the attached drawings: 1. Insulating base; 2. Cover plate; 21. Through hole; 22. Clip edge; 23. Clip hole; 3. Button; 31. Protrusion; 32. Flat part; 33. Column part; 4. Switch chamber; 5. Stationary contact piece; 6. Moving contact piece; 61. Fixed section; 62. Moving section; 7. Mounting base; 8. Dome switch; 9. Groove; 91. Protrusion; 10. Hard pad; 101. Clip protrusion; 11. Pressure plate; 12. Slot; 13. Protrusion; 14. Snap-on. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Example 1

[0024] Please see Figures 1 to 4 The push-button switch shown in the figure mainly includes an insulating base 1, a cover plate 2, a button 3, a stationary contact 5, a moving contact 6, a mounting base 7, and a dome switch 8. The insulating base 1 is rectangular and box-shaped, forming a switch chamber 4 inside. The stationary contact 5 is a conductive metal sheet, part of which extends into the switch chamber 4 as a fixed contact, and the other part extends from the side wall of the insulating base 1 for connecting to an external circuit. The moving contact 6 is an elastic conductive sheet, including a fixed section 61 and a movable section 62. The movable section 62 has a moving contact that mates with the stationary contact 5. The mounting base 7 is placed inside the switch chamber 4, and the moving contact 6 is fixed to the mounting base 7 by injection molding or riveting, thus moving up and down with the mounting base 7. The dome switch 8 is located below the mounting base 7, with its outer periphery abutting against the upper surface of the hard pad 10. The central arched part of the dome switch 8 contacts the bottom of the mounting base 7. When the button 3 is pressed, it pushes the mounting base 7 to press down the dome switch 8, causing the dome switch 8 to deform and the movable section 62 of the moving contact 6 to move up and down, thus realizing the circuit switching.

[0025] A groove 9 is formed on the bottom wall of the switch chamber 4 below the dome switch 8, and a smooth hard pad 10 is embedded in the groove 9. The hard pad 10 is preferably made of stainless steel sheet, and its surface is polished, resulting in a low coefficient of friction and wear resistance. The outer peripheral edge of the dome switch 8 directly presses against the upper surface of the hard pad 10. During the pressing process, there is sliding friction between the dome switch 8 and the hard pad 10. Because the surface of the hard pad 10 is smooth and has high hardness, it is not easy to produce wear or scratches after long-term use, thus maintaining the stable deformation and rebound characteristics of the dome switch 8 and ensuring a consistent pressing feel.

[0026] To further secure the rigid pad 10, the rigid pad 10 is designed as an annular thin sheet, with a protruding post 91 on the bottom surface of the corresponding groove. The rigid pad is fitted onto the protruding post 91, which saves material and provides a positioning function. The outer periphery of the rigid pad 10 protrudes outward to form a locking protrusion 101. The inner wall of the groove 9 is provided with a locking groove 12 that matches the locking protrusion 101 of the rigid pad 10. The locking protrusion 101 and the side wall of the locking groove 12 engage to prevent the rigid pad 10 from rotating or shifting within the groove 9.

[0027] Regarding the fixing method of the moving contact 6, this embodiment provides two feasible structures. In one structure, the lower surface of the button 3 is integrally injection molded with a downwardly protruding part 31, which is directly above the moving contact fixing section 61. When the cover plate 2 is pressed, the protruding part 31 continuously presses against the fixing section 61, so that the fixing section 61 is pressed tightly against the bottom wall of the switch chamber 4, and always maintains a fixed posture.

[0028] The moving contact 6 and the mounting base 7 can be integrally molded by injection molding or riveted to ensure reliable linkage between the two. Meanwhile, a limiting device is provided within the insulating base 1 to constrain the horizontal displacement of the fixed section 61. Specifically, the limiting device consists of multiple protrusions 13 extending upwards from the bottom of the switch chamber 4. These protrusions 13 are distributed around the periphery of the fixed section 61, forming a limiting groove together with the inner wall of the switch chamber 4. The fixed section 61 is locked within this limiting groove, thus preventing it from moving horizontally (including front, back, left, and right), and only experiencing the clamping force of the protrusions 31 or the pressure plate 11 in the vertical direction, ensuring its long-term stability.

[0029] Button 3 is T-shaped, comprising a flat portion 32 at the bottom and a cylindrical portion 33 at the top. Cover plate 2 covers the insulating base 1, with a through hole 21 in its center. The cylindrical portion 33 protrudes from the through hole 21 and extends beyond the cover plate 2 for the user to press. The flat portion 32 is held in place by the cover plate 2 to prevent button 3 from falling off. The cover plate 2 and the insulating base 1 are detachably fixed by a snap-fit ​​device. The snap-fit ​​device includes a retaining edge 22 extending downwards from the edge of the cover plate 2, and snap fasteners 14 protruding from the outer wall of the insulating base 1. The retaining edge 22 has retaining holes 23. When the cover plate 2 is closed, the snap fasteners 14 engage with the retaining holes 23 to lock the cover. The retaining edges 22 are located on at least two opposite sides of the cover plate 2 (e.g., the front and rear sides or the left and right sides). Correspondingly, the number and position of the snap fasteners 14 correspond one-to-one with the retaining edges 22, ensuring even force distribution and secure assembly of the cover plate 2.

[0030] During assembly, first press the hard pad 10 into the slot 12 of the groove 9, then place the mounting base 7 (with the moving contact 6 already fixed) into the switch chamber 4, so that the dome switch 8 is positioned below the mounting base 7 and its outer periphery is in contact with the hard pad 10. Next, place the button 3 in, selecting a button with a protrusion 31 according to the fixing method. Finally, cover the cover plate 2 and lock it in place using the snap-fit ​​device to complete the assembly. In use, press the column part 33, and the button 3 pushes the mounting base 7 down to press down the dome switch 8. The dome switch 8 deforms, causing the movable section 62 of the moving contact 6 to contact the stationary contact 5. After releasing, the dome switch 8 returns to its original position, and the movable section 62 disengages from the stationary contact 5, thus realizing the on / off control of the switch.

[0031] This invention effectively protects the bottom wall of the switch chamber 4 with the hard pad 10, extending its service life. At the same time, the multiple limiting measures of the fixed section 61 improve the electrical stability and mechanical durability of the switch, making it suitable for high-frequency operation applications.

[0032] Example 2

[0033] like Figure 5 As shown, the difference between this embodiment and Embodiment 1 is that the button in this embodiment does not have a protrusion 31. Instead, an independent pressure plate 11 is provided between the button 3 and the fixed section 61 of the moving contact. The pressure plate 11 fills the gap between the lower surface of the button 3 and the fixed section 61, thus achieving a permanent pressing of the fixed section 61. Regardless of the method used, the fixed section 61 is fixed for a long time, and only the moving section 62 moves with the mounting base 7.

Claims

1. A push-button switch, comprising an insulating base (1), a cover plate (2), and a button (3), wherein the insulating base (1) is provided with a switch chamber (4), and further comprises a stationary contact (5) and a moving contact (6), wherein a portion of a single stationary contact (5) extends into the switch chamber (4), and another portion extends out of the insulating base (1); further comprising a mounting base (7), wherein the moving contact (6) is coupled to the mounting base (7), and a dome switch (8) is provided below the mounting base (7), characterized in that: A smooth hard pad (10) is provided below the dome switch (8), and the outer periphery of the dome switch (8) abuts against the upper surface of the hard pad (10).

2. A push switch according to claim 1, characterized in that: The switch chamber (4) is provided with a groove (9), the hard pad and the dome switch are provided in the groove (9), and the hard pad (10) is a metal sheet.

3. A push switch according to claim 2, wherein: The rigid pad (10) is made of stainless steel.

4. The push switch of claim 1, wherein: The movable contact piece (6) includes a fixed section (61) and a movable section (62). The button (3) is integrally provided with a protrusion (31) that presses down the fixed section (61) of the movable contact piece, so that the fixed section (61) of the movable contact piece is in a fixed state for a long time.

5. The push switch of claim 1, wherein: The movable contact piece (6) includes a fixed section (61) and a movable section (62). A pressure plate (11) is provided between the button (3) and the fixed section (61) of the movable contact piece. The pressure plate (11) fills the gap between the button (3) and the movable contact piece (6), so that the fixed section (61) of the movable contact piece is in a fixed state for a long time.

6. The push switch of claim 1, wherein: The hard pad (10) is an annular thin sheet, and the bottom surface of the corresponding groove is provided with a protruding post. The hard pad is sleeved on the protruding post. The outer periphery of the hard pad (10) is provided with an outward protrusion (101). The inner arm of the groove (9) is provided with a slot (12) that is embedded in the protrusion (101) of the hard pad (10).

7. A push switch according to claim 4 or 5, characterised in that: The movable contact piece (6) is fixed or injection molded into the mounting base (7), and a limiting device is provided in the insulating base (1) to restrict the horizontal movement of the fixed section (61) of the movable contact piece.

8. A push switch according to claim 7, characterized in that: The limiting device consists of several protrusions (13) on the inner bottom of the switch chamber (4). The protrusions (13) work together with the inner wall of the switch chamber (4) to restrict the horizontal movement of the fixed section (61) of the moving contact piece.

9. The push switch of claim 1, wherein: The button (3) includes a flat part (32) and a cylindrical part (33). The cover plate (2) is located above the button (3) and presses down on the flat part (32) of the button. The cover plate (2) has a through hole (21) for the cylindrical part (33) of the button to extend out. The button (3) extends partially outside the cover plate (2). A snap-fit ​​device is provided between the cover plate (2) and the insulating base (1).

10. A push switch according to claim 9, wherein: The latching device includes: a latching edge (22) located on the edge of the cover plate (2) and extending to one side of the insulating base (1), and a latch (14) protruding from the side of the insulating base (1). The latching edge (22) is provided with a latching hole (23) that engages with the latch (14). The latching edge (22) is provided on at least two opposite sides of the cover plate (2), and the number and position of the latches (14) correspond to the latching edge (22).

Images