Button switch with overtravel protection mechanism
By introducing an over-stroke protection mechanism into the pusher switch, using components such as push rods, protective springs and contact rings, the problem of deformation of the contact springs under high-frequency pressing is solved, and the stability and durability of the switch are improved.
Patent Information
- Application Number
- CN202422371471.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-27
- Publication Date
- 2025-08-29
- Estimated Expiration
- 2034-09-27
AI Technical Summary
After the number of pressings of existing push button switches reaches 100,000 times, the contact reeds are prone to deform, resulting in product failure, and lack of over-stroke protection mechanism.
A super-stroke protection mechanism is designed, including a push rod, a protective compression spring, a contact ring and a reset compression spring. Through the synergy of these components, the contact reeds are avoided excessive deformation and the circuit is realized.
It extends the service life of the push button switch, ensures that the contact reeds will no longer move after effective contact, avoid deformation, and improves the stability and durability of the product.
Smart Images
Figure CN223284873U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of push button switches, in particular to a push button switch with an overtravel protection mechanism. Background Art
[0002] Push button switches are the most commonly used mechanical switches, widely used in industrial equipment. Push button switches use a button head to activate internal contacts. Their overall structure consists of two main components: an actuator and an electrical contact mechanism. Existing push button switches lack overtravel protection, resulting in a mechanical lifespan of only approximately 100,000 cycles.
[0003] When the number of presses reaches 100,000 times or more, the contact spring inside the product's electrical contact mechanism will deform, causing the product to fail. Utility Model Content
[0004] In order to solve the above technical problems, the utility model provides a push button switch with an overtravel protection mechanism.
[0005] The utility model is achieved through the following technical solutions.
[0006] The utility model provides a push button switch with an overtravel protection mechanism, comprising a base, a contact spring provided at the bottom of the inner side of the base, an upper connecting seat provided at the upper end of the inner side of the base, the center of the upper connecting seat being arranged to pass through, an upper connecting rod and a lower connecting rod passing through the center of the upper connecting seat, the upper connecting rod and the lower connecting rod being fixedly connected, a button sleeved on the upper connecting rod, a first annular groove provided on a side of the button close to the upper connecting rod, and an end of the upper connecting seat away from the base being slidably adapted to the first annular groove;
[0007] A return compression spring is sleeved on the lower connecting rod, one end of the return compression spring is connected to the upper connecting rod, and the other end is connected to one end of the upper connecting seat close to the base. An overtravel protection mechanism is provided on the lower connecting rod.
[0008] Preferably, the overtravel protection mechanism includes a push rod, a protective compression spring, and a contact ring. A limiting groove is provided at one end of the lower connecting rod away from the upper connecting rod. One end of the push rod slides through the limiting groove, and the other end passes through the limiting groove so that the contact ring is sleeved on the push rod. The two ends of the protective compression spring are respectively arranged at the bottom of the limiting groove and the end of the push rod close to the limiting groove.
[0009] Preferably, a second annular groove is provided on the inner side of the open end of the limiting groove, and a first retaining ring is provided in the second annular groove.
[0010] Preferably, a second retaining ring is sleeved on one end of the push rod extending out of the limiting groove.
[0011] Preferably, a groove is provided on the outer wall of the upper connecting rod, and a steel ball is slidably arranged in the groove. The end of the steel ball away from the bottom of the groove abuts against the inner side of the upper connecting seat, and the end of the steel ball close to the bottom of the groove abuts against a reversing compression spring, and the end of the reversing compression spring away from the steel ball abuts against the bottom of the groove.
[0012] Preferably, the upper end surface on the inner side of the upper connecting seat is provided with a curved step.
[0013] Preferably, a ferrule is sleeved on the upper connecting rod, and a through hole is opened on the ferrule. The steel ball moves through the through hole and contacts the inner side of the upper connecting seat. The diameter of the through hole is smaller than the diameter of the steel ball.
[0014] Preferably, the upper end of the base is connected to a metal shell, and the end of the inner side of the metal shell away from the base is gap-fitted with the button; a limiting block is provided on the end of the inner side of the metal shell close to the base, and an annular block is provided on the outer side of the upper connecting seat, which is clamped on the limiting block.
[0015] The beneficial effects of the present invention are:
[0016] 1. Press the button under the action of external force, so that the button moves toward the bottom of the base with the upper connecting rod and the lower connecting rod, so that the overtravel protection mechanism contacts the contact spring, the reset compression spring is in a compressed state, and the switch circuit is opened; when the external force disappears, the reset compression spring pushes the upper connecting rod, the lower connecting rod and the overtravel protection mechanism to move back by its own force, so that the overtravel protection mechanism no longer contacts the contact spring, the entire circuit is in a disconnected state, and the switch completes an action cycle. The overtravel protection structure and the contact spring will not move forward after reaching effective contact. During this process, the contact spring will not be deformed due to overpressure, thereby extending the service life of the product.
[0017] 2. When the lower connecting rod is pushed toward the bottom of the base by external force, the push rod moves toward the bottom of the base, and moves the contact ring toward the bottom of the base, so that the contact ring contacts the contact spring. At the same time, the protective compression spring is subjected to the reaction force of the push rod, so that the protective compression spring is in a compressed state, so that the contact ring and the contact spring are elastically in contact with each other, so that the two always maintain effective contact. At the same time, the contact ring and the contact spring are buffered and protected during contact to ensure the stability of product contact. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a structural diagram of the utility model;
[0019] Figure 2 This is a partial structural diagram of the utility model mainly used to show the overtravel protection mechanism, upper connecting seat, upper connecting rod, lower connecting rod and button structures;
[0020] Figure 3 This is a partial structural diagram of the utility model mainly used to illustrate the structure of the overtravel protection mechanism, etc.
[0021] Figure 4 This is a three-dimensional structural diagram mainly used to show the structures of the upper connecting seat, upper connecting rod, lower connecting rod and button;
[0022] Figure 5 This utility model is mainly used to show the three-dimensional structure diagram of the electrical contact connection;
[0023] Explanation of the accompanying drawings: 1-base; 2-contact spring; 3-rivet; 4-welding piece; 5-upper connecting seat; 6-upper connecting rod; 7-lower connecting rod; 8-button; 9-first annular groove; 10-reset compression spring; 11-push rod; 12-protective compression spring; 13-contact ring; 14-limiting groove; 15-second annular groove; 16-first retaining ring; 17-second retaining ring; 18-groove; 19-steel ball; 20-reversing compression spring; 21-arc step; 22-ring; 23-metal shell; 24-limiting block; 25-annular block; 26-installation panel. DETAILED DESCRIPTION
[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0025] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.
[0026] In this embodiment, referring to Figure 1 , including a base 1, the base 1 is set to a cylindrical shape, the bottom of the base 1 is sealed, the bottom of the outer side of the base 1 is provided with a welding piece 4 to facilitate the conduction of the circuit, the bottom of the inner side of the base 1 is provided with a contact spring 2, and there are multiple contact springs 2. The multiple contact springs 2 are fixed to the bottom of the inner side of the base 1 by rivets 3, and are distributed at equal intervals around the center of the base 1.
[0027] Reference Figure 1A snap-fitting step is provided along the inner circumference of the upper end of the base 1, and an upper connecting seat 5 is provided on the snap-fitting step. The center of the upper connecting seat 5 is set through, and the upper end of the base 1 is fixedly connected to a metal shell 23. A limit block 24 is provided on the inner side of the metal shell 23 near one end of the base 1. An annular block 25 is integrally connected to the outer side of the upper connecting seat 5. The annular block 25 is fixedly connected to the limit block 24, so that the base 1, the upper connecting seat 5 and the metal shell 23 are fixedly connected together. The outer side of the metal shell 23 is installed on the mounting panel 26, so that the entire switch is installed on the mounting panel 26.
[0028] In this embodiment, referring to Figure 1 、 Figure 2 and Figure 4 An upper connecting rod 6 and a lower connecting rod 7 are inserted into the upper connecting seat 5, and the upper connecting rod 6 and the lower connecting rod 7 are connected as a whole. A button 8 is sleeved on the upper connecting rod 6, so that the button 8 is fixedly connected to the upper connecting rod 6, and the outer side of the button 8 is clearance-matched with the inner side of the metal shell 23, so that the button 8 can move longitudinally inside the metal shell 23; at the same time, a first annular groove 9 is opened on the side of the button 8 close to the upper connecting rod 6, and the end of the upper connecting seat 5 away from the base 1 is slidably adapted to the first annular groove 9, so that relative movement is achieved between the button 8 and the upper connecting seat, and the moving distance of the button 8 is limited.
[0029] In this embodiment, referring to Figure 1 and Figure 2 The outer wall of the upper connecting rod 6 is provided with two grooves 18, and the two grooves 18 are symmetrically arranged along the axis of the upper connecting rod 6. A steel ball 19 is slidably arranged in each groove 18, and the steel ball 19 is also rotated in the groove 18. The end of the steel ball 19 close to the bottom of the groove 18 abuts against a reversing compression spring 20, and the end of the reversing compression spring 20 away from the steel ball 19 abuts against the bottom of the groove 18;
[0030] A ring 22 is sleeved on the upper connecting rod 6, and a through-hole is opened on the ring 22. The diameter of the through-hole is smaller than the diameter of the steel ball 19, which limits the steel ball 19. The steel ball 19 is pushed out of the through-hole by the force of the reversing compression spring 20 itself and conflicts with the inner side of the upper connecting seat 5. The upper end surface of the inner side of the upper connecting seat 5 is provided with an arc step 21, so that when the button 8 is not subjected to external force, the steel ball 19 conflicts on the arc step 21, which has a certain relative stabilizing effect on the upper connecting rod 6 and the upper connecting seat 5.
[0031] When the button 8 is pressed under the action of external force, the upper connecting rod 6 is driven to move toward the base 1. The steel ball 19 is always pressed against the inner wall of the upper connecting seat 5 by the force of the reversing compression spring 20. The steel ball 19 rolls along the inner wall of the upper connecting seat 5, which facilitates the button 8 to produce a clear feel and achieve quick contact, reducing electrical wear and arcing on the contact surface.
[0032] In this embodiment, referring to Figure 2 , an annular stopper is integrally connected to the inner side of the upper connecting seat 5 near one end of the base 1, and a return compression spring 10 is sleeved on the lower connecting rod 7, one end of the return compression spring 10 abuts against the end of the upper connecting rod 6, and the other end abuts against the annular stopper; when the button 8 moves downward, the upper connecting rod 6 moves toward the base 1, so that the return compression spring 10 is in a compressed state, realizing electrical contact. When the electrical contact is completed, the button 8 is released, and the upper connecting rod 6 and the lower connecting rod 7 move back by the action of the return compression spring 10, thereby realizing the reset of the button 8, the upper connecting rod 6 and the lower connecting rod 7.
[0033] In the examples of this application, refer to Figure 2 , Figure 3 and Figure 5 , an overtravel protection mechanism is provided on the lower connecting rod 7, which includes a push rod 11, a protective compression spring 12, and a contact ring 13. A limiting groove 14 is provided at one end of the lower connecting rod 7 away from the upper connecting rod 6, and a second annular groove 15 is provided on the inner side of the open end of the limiting groove 14. A first retaining ring 16 is provided in the second annular groove 15; the push rod 11 is composed of a clamping portion and a connecting portion. The cross-sectional diameter of the clamping portion is greater than the cross-sectional diameter of the connecting portion. The clamping portion slides relative to the inner side wall of the limiting groove 14, so that the first retaining ring 16 clamps the clamping portion to limit the push rod. The rod 11 slides in the limit groove 14 to prevent the push rod 11 from falling out of the limit groove 14 as a whole. One end of the protective compression spring 12 is connected to the bottom of the limit groove 14, and the other end is connected to the clamping part; the end of the connecting part away from the clamping part extends out of the limit groove 14 and allows the contact ring 13 to be sleeved on the connecting part, and the end of the connecting part extending out of the limit groove 14 is also sleeved with a second retaining ring 17. The second retaining ring 17 abuts against the side of the contact ring 13 away from the limit groove 14, so that the second retaining ring 17 limits the contact ring 13 firmly and prevents the contact ring 13 from falling off the push rod 11.
[0034] The working principle of this embodiment is as follows: when the button 8 is pressed by external force, pushing the lower connecting rod 7 to move toward the bottom of the base 1, the push rod 11 moves toward the bottom of the base 1, and moves the contact ring 13 toward the bottom of the base 1, so that the contact ring 13 contacts the contact spring 2, and the reset compression spring 10 is in a compressed state, realizing circuit connection. At the same time, the protective compression spring 12 is subjected to the reaction force of the push rod 11, and the protective compression spring 12 is in a compressed state, so that the contact ring 13 and the contact spring 2 are elastically in contact with each other, so that the two always maintain effective contact. At the same time, the contact process between the contact ring 13 and the contact reed 2 is buffered and protected to ensure the stability of the product contact; when the button 8 is no longer subjected to external force, the reset compression spring 10 pushes the button 8, the upper connecting rod 6 and the lower connecting rod 7 to reset through its own force, and the contact ring 13 is no longer in contact with the contact reed 2, the circuit is disconnected, and the switch completes an action cycle. After reaching effective contact, the contact ring 13 and the contact reed 2 will not continue to move forward. During this process, the contact reed 2 will not be deformed due to overpressure, thereby extending the service life of the product.
[0035] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. All equivalent structural transformations made based on the contents of the present invention specification and drawings, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present invention.
Claims
1. A push button switch with an overtravel protection mechanism, characterized in that: The invention comprises a base (1), a contact spring (2) is provided at the bottom of the inner side of the base (1), an upper connecting seat (5) is provided at the upper end of the inner side of the base (1), the center of the upper connecting seat (5) is through-set, an upper connecting rod (6) and a lower connecting rod (7) are passed through the center of the upper connecting seat (5), the upper connecting rod (6) and the lower connecting rod (7) are fixedly connected, a button (8) is sleeved on the upper connecting rod (6), a first annular groove (9) is provided on the side of the button (8) close to the upper connecting rod (6), and an end of the upper connecting seat (5) away from the base (1) is slidably adapted to the first annular groove (9); A return compression spring (10) is sleeved on the lower connecting rod (7), one end of the return compression spring (10) is connected to the upper connecting rod (6), and the other end is connected to an end of the upper connecting seat (5) close to the base (1). An overtravel protection mechanism is provided on the lower connecting rod (7).
2. A push button switch with an overtravel protection mechanism according to claim 1, characterized in that: The overtravel protection mechanism comprises a push rod (11), a protective compression spring (12), and a contact ring (13); a limit groove (14) is provided at one end of the lower connecting rod (7) away from the upper connecting rod (6); one end of the push rod (11) is slidably inserted into the limit groove (14), and the other end passes through the limit groove (14) so that the contact ring (13) is sleeved on the push rod (11); and the two ends of the protective compression spring (12) are respectively arranged at the bottom of the limit groove (14) and the end of the push rod (11) close to the limit groove (14).
3. A push button switch with an overtravel protection mechanism according to claim 2, characterized in that: A second annular groove (15) is provided on the inner side of the open end of the limiting groove (14), and a first retaining ring (16) is provided in the second annular groove (15).
4. A push button switch with an overtravel protection mechanism according to claim 2, characterized in that: One end of the push rod (11) extending out of the limiting groove (14) is sleeved with a second retaining ring (17).
5. A push button switch with an overtravel protection mechanism according to claim 1, characterized in that: A groove (18) is provided on the outer wall of the upper connecting rod (6), and a steel ball (19) is slidably provided in the groove (18). An end of the steel ball (19) away from the bottom of the groove (18) abuts against the inner side of the upper connecting seat (5), and an end of the steel ball (19) close to the bottom of the groove (18) abuts against a reversing compression spring (20), and an end of the reversing compression spring (20) away from the steel ball (19) abuts against the bottom of the groove (18).
6. A push button switch with an overtravel protection mechanism according to claim 1, characterized in that: The upper end surface inside the upper connecting seat (5) is provided with a curved step (21).
7. A push button switch with an overtravel protection mechanism according to claim 5, characterized in that: The upper connecting rod (6) is sleeved with a ferrule (22), which is provided with a perforation. The steel ball (19) moves through the perforation and contacts the inner side of the upper connecting seat (5). The diameter of the perforation is smaller than the diameter of the steel ball (19).
8. The push button switch with an overtravel protection mechanism according to claim 1, wherein: The upper end of the base (1) is connected to a metal shell (23), and the inner end of the metal shell (23) away from the base (1) is clearance-matched with the button (8); the inner end of the metal shell (23) close to the base (1) is provided with a limit block (24), and the outer side of the upper connecting seat (5) is provided with an annular block (25), and the annular block (25) is clamped on the limit block (24).