Key switch

Abstract

The utility model discloses a key switch, and belongs to the technical field of switches. The key switch comprises a shell, a ratchet wheel key assembly and an elastic contact piece, the ratchet wheel key assembly and the elastic contact piece are arranged on the shell, one end of the key switch is installed on the shell, the other end of the key switch is provided with a contact part, and the contact part abuts against the ratchet wheel key assembly. The first end of the bimetallic strip is installed on the shell, and the second end of the bimetallic strip is provided with a static contact which is separably connected with the contact part; the reset linkage piece is rotationally arranged on the shell, the reset linkage piece is provided with a connecting arm and a reset arm, the connecting arm is used for being connected with the contact part, and the reset arm is used for being connected with the second end of the bimetallic strip; the connector lug is arranged on the shell, the connector lug is configured to be electrically connected with an external wire or a plug pin in a matched mode, and the connector lug and the elastic contact piece are configured to be connected with a zero line and a live line of an external power source respectively. The key switch provided by the utility model is convenient to install, safe and reliable.

Description

Technical Field

[0001] This application belongs to the technical field of push-button switches, and particularly relates to a push-button switch. Background Art

[0002] A push-button switch is a convenient push-on and push-off type of switch that achieves conduction or cutoff through pressing, with convenient operation and stable and reliable on-off states. The push-button switch includes a ratchet button assembly, a moving contact piece, and a static contact piece. The moving contact piece and the static contact piece are cooperatively arranged in a housing, and the moving contact piece can elastically deform to contact and connect or disconnect from the static contact piece; one end of the ratchet assembly abuts against the moving contact piece to drive the deformation and movement of the moving contact piece, and the self-locking function of the ratchet assembly can be utilized to maintain the current position to lock the position of the moving contact piece and maintain the connection or disconnection state between the moving contact piece and the static contact piece.

[0003] During actual use, electrical components such as indicator lights may be assembled on the push-button switch. One power terminal of the electrical component needs to be electrically connected to the conductive structure inside the push-button switch, and the other power terminal needs to be externally connected to a power terminal. This makes the assembly and use of the push-button switch relatively inconvenient, and for the installed terminal, such as a socket, an additional conductive structure needs to be configured, restricting the use of the push-button switch; moreover, this usage method is also likely to increase the overload risk of the push-button switch. Summary of the Invention

[0004] This application provides a push-button switch, aiming to at least solve to a certain extent the technical problems of high overload safety risk, inconvenient assembly operation, and limited application range of the push-button switch. To this end,

[0005] An embodiment of this application provides a push-button switch, including a housing and a ratchet button assembly arranged on the housing; the push-button switch further includes:

[0006] An elastic contact piece, with one end installed on the housing and the other end provided with a contact portion that abuts against the ratchet button assembly, and the contact portion moves under the drive of the ratchet button assembly;

[0007] A bimetallic strip, with the first end installed on the housing, and the second end of the bimetallic strip provided with a static contact point that can be detachably connected to the contact portion. When the bimetallic strip undergoes overload deformation, the second end of the bimetallic strip deforms and displaces to cause the static contact point to move away from the contact portion;

[0008] The reset linkage is rotatably disposed on the housing. The reset linkage includes a connecting arm and a reset arm. The connecting arm is used to connect the contact portion, and the reset arm is used to connect the second end of the bimetal sheet. When the second end of the bimetal sheet is deformed and displaced, during the process of the contact portion moving under an external force, the connecting arm drives the reset linkage to rotate, thereby driving the reset arm to move the second end of the bimetal sheet in a direction opposite to the deformation and displacement direction of the second end of the bimetal sheet, so that the static contact moves toward the contact portion;

[0009] The terminal is disposed on the housing. The terminal is configured to be electrically connected in a matching manner with an external wire or a plug, and the terminal and the elastic contact piece are configured to be respectively connected to the neutral wire and the live wire of an external power supply.

[0010] In some embodiments, the terminal has a plugging portion configured to be inserted and connected with an external structure.

[0011] In some embodiments, the terminal has a wire-pressing portion configured to be crimped with an external wire.

[0012] In some embodiments, the terminal has a wire-inserting hole configured to receive and press an external wire.

[0013] In some embodiments, a wire-pressing arm is disposed on the terminal. The wire-pressing arm extends into the wire-inserting hole, and there is a wire-inserting gap between the end of the wire-pressing arm and the hole wall of the wire-inserting hole.

[0014] In some embodiments, a wire-pressing arm is disposed on the terminal. The wire-pressing arm extends into the wire-inserting hole, and there is a wire-inserting gap between the ends of two adjacent wire-pressing arms, and the extending directions of the wire-pressing arms on both sides of the wire-inserting gap are obliquely intersecting.

[0015] In some embodiments, a hook portion is disposed on the connecting arm, and a hanging arm is disposed on the contact portion. The hanging arm is cooperatively lapped with the hook portion.

[0016] In some embodiments, the reset linkage further includes a rotating shaft. The connecting arm and the reset arm are disposed on the circumferential side surface of the rotating shaft, and both ends of the rotating shaft are rotatably connected to the housing.

[0017] In some embodiments, the push-button switch further includes an indicator light assembly having a first power supply connector and a second power supply connector. The first power supply connector is electrically connected to the elastic contact piece, and the second power supply end is electrically connected to the terminal.

[0018] In some embodiments, the key switch further includes a pressing seat, the housing is connected to the pressing end of the ratchet key assembly, the indicator light assembly includes an indicator light circuit, the second power connector is a conductive spring, the indicator light circuit is arranged in the pressing seat, one power terminal of the indicator light circuit is electrically connected to the first power connector, the other power terminal of the indicator light circuit abuts against the first end of the conductive spring, and the second end of the conductive spring abuts against the connection head.

[0019] The embodiments of the present application at least have the following beneficial effects:

[0020] The key switch provided by the embodiments of the present application includes a housing and a ratchet key assembly, an elastic contact piece, a bimetallic strip, a reset linkage and a connection head arranged in the housing. The first end of the elastic contact piece is installed in the housing, and the contact part of the second end of the elastic contact piece abuts against one end of the ratchet key assembly and can deform and move under the drive of the ratchet key assembly; the first end of the bimetallic strip is installed in the housing, and the second end of the bimetallic strip is provided with a static contact, which cooperates to connect or disconnect the contact part of the second end of the elastic contact piece to realize the function of the key switch; the connection head provides an electrical connection part for the electrical components configured on the key switch, and together with the elastic contact piece provides two electrical connection segments, so that the electrical components do not need to be externally connected to the power terminals on the terminal, which simplifies the assembly and use difficulty of the key switch to a certain extent and improves the assembly efficiency.

[0021] On the other hand, by utilizing the characteristic of the bimetallic strip deforming under overload, the static contact at the second end of the bimetallic strip can deform and move following the second end of the bimetallic strip to disconnect the electrical connection with the elastic contact piece, thereby realizing overload power-off protection; at the same time, the reset linkage is rotatably arranged on the housing, and a connecting arm and a reset arm are arranged on the reset linkage. Thus, the reset arm deflects following the rotation of the reset linkage. The connecting arm of the reset linkage is connected to the contact part of the elastic contact piece, and the movement track of the reset arm intersects with the track of the second end of the bimetallic strip shifting due to overload deformation, that is, the reset arm is arranged on the overload deformation shifting track of the bimetallic strip. Thus, when the bimetallic strip is overloaded and deformed, its second end deforms and shifts and approaches and even abuts against the reset arm; at this time, the contact part can be shifted by pressing the ratchet key assembly, thereby driving the reset linkage to rotate through the connecting arm, so that the reset arm deflects, and thus pushes the second end of the bimetallic strip along the direction reverse to the overload deformation shifting direction of the second end of the bimetallic strip, forcing it to move back to its original position, thereby realizing the reset of the shape and position of the bimetallic strip after overload to ensure the functional reliability of the switch structure. Description of the Drawings

[0022] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 Shows an exploded structural schematic diagram of the key switch in the embodiment of the present application;

[0024] Figure 2 Shows Figure 1 The assembled state schematic diagram of the key switch in;

[0025] Figure 3 Shows Figure 1 The assembled state schematic diagram of the elastic contact piece, bimetallic piece and reset linkage in the key switch in;

[0026] Figure 4 Shows Figure 2 The off-state structural schematic diagram of the key switch in;

[0027] Figure 5 Shows Figure 2 The on-state structural schematic diagram of the key switch in;

[0028] Figure 6 Shows Figure 2 The overload-state structural schematic diagram of the key switch in;

[0029] Figure 7 Shows Figure 1 The first wiring head assembled state schematic diagram of the key switch in;

[0030] Figure 8 Shows Figure 1 The second wiring head assembled state schematic diagram of the key switch in;

[0031] Figure 9 Shows an exploded structural schematic diagram of another key switch in the embodiment of the present application;

[0032] Figure 10 Shows Figure 9 The structural schematic diagram of the third wiring head of the key switch in;

[0033] Figure 11 Shows Figure 10 The assembled state schematic diagram of the third wiring head of the key switch in;

[0034] Figure 12 Shows the assembled state schematic diagram of the second wiring head of the key switch in 9;

[0035] Figure 13 Shows a schematic assembly state diagram of the first wiring head of the push-button switch in 9. Detailed implementation manners

[0036] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0037] In addition, the present application may repeat reference numerals and / or reference letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or arrangements discussed. In addition, the present application provides examples of various specific processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0038] The present application will be described below in conjunction with the accompanying drawings and with reference to specific embodiments:

[0039] In some push-button switches, various electrical components such as indicator lights are usually configured. Usually, one power supply terminal of the electrical component is connected to the conductive structure of the push-button switch, and the other power supply terminal needs to be provided with a conductive structure such as an external wiring cable to be connected to a common neutral line or other structures of a terminal device such as a power strip, resulting in inconvenient assembly and application of the push-button switch and limiting the scope of use. At the same time, such push-button switches are usually prone to overload risks, resulting in the switch being burned out.

[0040] For this reason, the embodiments of the present application provide a push-button switch, aiming to improve the convenience, safety and less usage restrictions of the push-button switch to a certain extent.

[0041] Figure 1 Shows an exploded structure diagram of the push-button switch in the embodiments of the present application; Figure 2 Shows Figure 1 the schematic assembly state diagram of the push-button switch in Figure 3 Shows Figure 1 the schematic assembly state diagram of the elastic contact piece, bimetallic piece and reset linkage member of the push-button switch in Figure 4 Shows Figure 2 the schematic off-state structure diagram of the push-button switch in Figure 5 Shows Figure 2 the schematic on-state structure diagram of the push-button switch in Figure 6 Shows Figure 2 the schematic overload-state structure diagram of the push-button switch in

[0042] See Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 , in some embodiments, the push-button switch is a single-break switch, usually only controlling the on-off of the line on the live wire, so that the electrical components installed on the push-button switch, such as indicator lights, etc., can only be externally connected to one power supply, making the entire installation operation very inconvenient. For this reason, a special wiring terminal 8 can be provided on the push-button switch as a power supply connector for the electrical component, and the conductive structure inside the push-button switch serves as another power supply connector, so that when assembling the electrical component, the installation can be achieved conveniently and quickly.

[0043] Considering the assembly of electrical components, to a certain extent, it increases the risks of short circuit and overload. For this reason, the push-button switch usually needs to be provided with an overload protection function. Therefore, the push-button switch can be configured with a bimetal sheet with an overload deformation function as an overload-sensitive element to track the overload state, achieve the open-circuit protection function through the deformation and displacement of the bimetal sheet during overload, and be configured with a reset structure to realize the reset of the attitude and position of the bimetal sheet after power-off, so as to ensure the stability and reliability of the switch function.

[0044] Specifically, the push-button switch may include a housing 1 and a ratchet button assembly 2, an elastic contact 3, a bimetal sheet 4, a reset linkage 5 and a wiring terminal 8 for externally connecting the neutral wire provided on the housing 1; the elastic contact 3 is detachably connected to the bimetal sheet 4, and the ratchet button assembly 2 is connected to the elastic contact 3. By pressing the ratchet button assembly 2, the free end of the elastic contact 3 is driven to approach or move away from the bimetal sheet 4 to connect or disconnect from the bimetal sheet 4, realizing the on-off function of the switch; and when overloaded, the connection between the bimetal sheet 4 and the elastic contact 3 can be disconnected by using the deformation and displacement of the bimetal sheet 4 to achieve overload open-circuit protection.

[0045] The reset linkage 5 is connected to the free end of the elastic contact 3 and is matched with the position of the bimetal sheet 4. After the bimetal sheet 4 is deformed and displaced due to overload, by pressing the ratchet button assembly 2, the reset linkage 5 can be driven to act, forcing the bimetal sheet 4 to reset to the position and attitude before overload, ensuring the reliability of the switch function.

[0046] Among them, the housing 1 is the bearing foundation of the entire push-button switch, used to accommodate or install other functional components such as the ratchet button assembly 2, the elastic contact 3, the bimetal sheet 4 and the reset linkage 5. The housing 1 can also be used as the installation foundation of the push-button switch and be configured to be installed on other product structures. For example, the housing 1 can be installed on various electrical devices such as a power strip.

[0047] The ratchet button assembly 2 is disposed on the housing 1 and can be elongated or shortened along the pressing direction and maintain the state and position after pressing, so as to cooperate with pressing the elastic contact piece 3 to switch it between two positions and maintain the switched position, so as to realize the switching of the connection and separation states between the elastic contact piece 3 and the bimetallic piece 4 and maintain the switched state. Generally, the ratchet button assembly 2 may include an upper ratchet 21, a lower ratchet 22 and a ratchet spring 23 sleeved in sequence. A ratchet seat 13 adapted to the upper ratchet 21 is provided on the housing 1 for guiding the stable up and down movement of the upper ratchet 21. The teeth of the upper ratchet 21 and the lower ratchet 22 are engaged. The ratchet spring 23 elastically abuts against the lower ratchet 22. By pressing the upper ratchet 21, the lower ratchet 22 can be moved downward and maintained at the current position, or by pressing the upper ratchet 21, the lower ratchet 22 can be moved upward to reset and maintain the current position, so as to realize the switching between the upper and lower positions and realize the function of the switch button.

[0048] The elastic contact piece 3 is a conductive contact piece and can be deformed and displaced to a certain extent; the first end of the elastic contact piece 3 is a fixed end 31, which can be installed and fixed in the housing 1. The second end of the elastic contact piece 3 is a free end 32, and the free end 32 can move under the action of an external force; a contact portion 32a can be provided at the free end 32 of the elastic contact piece 3 for contacting and connecting the bimetallic piece 4 to realize electrical connection. The contact portion 32a can also abut against the ratchet button assembly 2 to move under the pushing of the ratchet button assembly 2; generally, the ratchet spring 23 can be abutted against the contact portion 32a.

[0049] The bimetallic piece 4 is an electrical connection component. The first end 41 of the bimetallic piece 4 is installed in the housing 1. A static contact 42a is provided at the second end 42 of the bimetallic piece 4, and the static contact 42a can be electrically connected or disconnected from the elastic contact piece 3. Among them, the bimetallic piece 4 has an overload deformation function and can be used as an overload sensitive component to track the power consumption situation; when the bimetallic piece 4 is overloaded, a large amount of heat will be generated, causing the bimetallic piece 4 to deform in a set direction and accumulate at the second end 42 of the bimetallic piece 4, causing a large deformation and displacement of the second end 42 of the bimetallic piece 4, and the static contact 42a will also be greatly displaced, so as to disconnect the connection with the contact portion 32a, thus realizing the overload protection open circuit function.

[0050] The reset linkage 5 is an element for driving the bimetal 4 after overloading deformation to reset. It is rotatably arranged on the housing 1, and the reset linkage 5 has a connecting arm 51 and a reset arm 52; the connecting arm 51 is connected to the connecting portion 32a, and the reset arm 52 is arranged on the overloading deformation bending side of the second end 42 of the bimetal 4. Thus, when the bimetal 4 is overloaded and deformed, the second end 42 of the bimetal 42 will move towards the reset arm 52 or move together with the reset arm 52. When reset is needed, the free end 32 of the elastic contact 3 can be driven to move by pressing the ratchet button assembly 2, thereby driving the connecting arm 51 to move and driving the reset linkage 5 to rotate, so as to prompt the reset arm 52 to push the second end 42 of the bimetal 42 to move in the opposite direction of the deformation of the second end 42 of the bimetal 42, and finally reset to the position and posture before overloading deformation, so as to restore the cooperation switch function between the bimetal 4 and the elastic contact 3 and improve the reliability of the switch function.

[0051] The terminal 8 is used to externally connect the neutral wire to supply power to the electrical components configured on the push-button switch. Thus, the terminal 8 and the elastic contact 3 are respectively configured to correspondingly connect to the external neutral wire and live wire.

[0052] Generally, for the convenience of assembly, the terminal 8 is configured to be electrically connected in a matching manner with an external wire or plug. Thus, during installation, it can be directly and quickly connected corresponding to an external plug or wire.

[0053] That is to say, by using the standardized connection method of the terminal 8, it can be conveniently connected to the power supply end of products such as power strips; and the electrical components on the push-button switch can be electrically connected to the terminal according to actual situations, thereby reducing the requirements for products and helping to expand the scope of application.

[0054] The push-button switch provided by the embodiment of the present application includes a housing and a ratchet button assembly, an elastic contact, a bimetal and a reset linkage arranged in the housing. The first end of the elastic contact is installed in the housing, and the contact portion of the second end of the elastic contact abuts against one end of the ratchet button assembly and can deform and move under the drive of the ratchet button assembly; the first end of the bimetal is installed in the housing, and a static contact is arranged at the second end of the bimetal to cooperate with connecting or disconnecting the contact portion of the second end of the elastic contact to realize the push-button switch function; the terminal provides an electrical connection part for the electrical components configured on the push-button switch, and together with the elastic contact provides two electrical connection segments, so that the electrical components do not need to externally connect to the power supply end on the terminal, which simplifies the assembly and use difficulty of the push-button switch to a certain extent and improves the assembly efficiency.

[0055] On the other hand, by utilizing the characteristic of the bimetal sheet to deform under overload, the static contact at the second end of the bimetal sheet can move following the deformation of the second end of the bimetal sheet to disconnect the electrical connection with the elastic contact piece, thereby achieving overload power-off protection. At the same time, the reset linkage is rotatably arranged on the housing. A connecting arm and a reset arm are arranged on the reset linkage. Thus, the reset arm deflects following the rotation of the reset linkage. The connecting arm of the reset linkage is connected to the contact part of the elastic contact piece. The movement trajectory of the reset arm intersects with the trajectory of the second end of the bimetal sheet shifting due to overload deformation, that is, the reset arm is arranged on the overload deformation and displacement trajectory of the bimetal sheet. Thus, when the bimetal sheet is deformed due to overload, its second end deforms and shifts and approaches and even abuts against the reset arm. At this time, the contact part can be displaced by pressing the ratchet key assembly, thereby driving the reset linkage to rotate through the connecting arm, so that the reset arm deflects, and thus pushing against the second end of the bimetal sheet along the direction reverse to the overload deformation and displacement direction of the second end of the bimetal sheet, forcing it to move back to its original position, thereby realizing the reset of the shape and position of the bimetal sheet after overload to ensure the functional reliability of the switch structure.

[0056] Figure 7 shows Figure 1 the first wiring head assembly state schematic diagram of the push-button switch in Figure 8 shows Figure 1 the second wiring head assembly state schematic diagram of the push-button switch in Figure 12 shows the assembly state schematic diagram of the second wiring head of the push-button switch in 9; Figure 13 shows the assembly state schematic diagram of the first wiring head of the push-button switch in 9.

[0057] See Figure 7 and Figure 13 In some embodiments, the wiring head 8 is provided with a plug-in portion 81, and the plug-in portion 81 is used to be correspondingly plugged into an external adapter kit. Thus, when installing the push-button switch, the plug-in portion 81 can be directly plugged into the power supply terminal on products such as a wiring board, which is fast and reliable.

[0058] The wiring head 8 should have an electrical connection portion 82 corresponding to connecting the electrical components on the push-button switch. The electrical connection portion 82 can be arranged inside the housing 1.

[0059] Generally speaking, the wiring head 8 can be led out from the width or length direction of the housing 1.

[0060] See Figure 8 and Figure 12, in some embodiments, for wire connection, a wire pressing part 83 may be provided on the terminal head 8. The wire 86 can be embedded in the wire pressing part 83, and then the wire pressing part 83 is pressed to clamp the wire 86. Compared with connection methods such as welding, it has simpler operation and equipment requirements.

[0061] Generally, the wire pressing part 83 can be set in a hook shape, and the wire 86 can be embedded in the groove of the hook, and then the hook is flattened to press the wire 86.

[0062] Generally, the terminal head 8 can be led out from the width or length direction of the housing 1.

[0063] Figure 9 The exploded structural schematic diagram of another key switch in the embodiments of the present application is shown; Figure 10 is shown Figure 9 The structural schematic diagram of the third terminal head of the key switch in Figure 11 is shown Figure 10 The assembled state schematic diagram of the third terminal head of the key switch in

[0064] See Figure 9 , Figure 10 and Figure 11 , in some embodiments, an insertion hole 84 may be opened on the terminal head 8, and the wire end of the wire 86 can be directly inserted into the insertion hole 84.

[0065] Generally, the aperture specification of the insertion hole 84 should be slightly larger than the specification of the wire 86 so that the wire 86 can be stably embedded; usually, the insertion hole 84 can be set as an elastic deformation structure to stably clamp the wire 86.

[0066] Generally, the terminal head 8 can be led out from the length direction of the housing 1.

[0067] In some embodiments, in order to prevent the wire 86 from pushing the insertion hole 84, a wire pressing arm 85 may be provided on the terminal head. The wire pressing arm 85 extends into the insertion hole 84, and the wire pressing arm 85 can be elastically displaced to adapt to different specifications of the guide wire and elastically press the wire 86.

[0068] In some embodiments, multiple wire pressing arms 85 may be provided, and an insertion gap 87 is left between adjacent two wire pressing arms 85.

[0069] Usually, the extending directions of adjacent two wire pressing arms 85 are obliquely intersecting, and in the direction of inserting the wire, the fixed end of the wire pressing arm 85 and the free end of the wire pressing arm 85 are arranged in sequence. That is to say, the insertion gap 87 is first large and then small to facilitate the insertion of the wire.

[0070] On the other hand, after the wire 86 is inserted, the ends of the two extension arms 85 clamp the wire 86, so that greater resistance will be generated when the wire is detached, thereby increasing the difficulty of wire detachment.

[0071] See Figures 1 - 8 , in some embodiments, the multifunctional switch further includes an indicator light assembly. The indicator light assembly 7 is configured with a first power connector 72 and a second power connector 73. The first power connector 72 is electrically connected to the elastic contact 3, and the second power connector is electrically connected to the terminal 8.

[0072] In some embodiments, the indicator light assembly 7 is further configured with a pressing seat 74. The pressing seat 74 is connected to the ratchet button assembly 2. The indicator light assembly 7 includes an indicator light circuit 71a. The indicator light circuit 71a is installed in the pressing seat 74. One power terminal of the indicator light circuit 71a is connected to the first power connector 72, and the other power terminal of the indicator light circuit 71a is connected to the second power connector 73.

[0073] In some embodiments, the second power connector 73 can be set as a conductive spring 73a. The two ends of the conductive spring 73a are respectively elastically connected to the power terminal of the indicator light circuit 71a and the wiring part 82 of the terminal 8.

[0074] In some embodiments, the bimetal 4 is provided with a through hole 43 penetrating the bimetal 4 in the thickness direction, and an extension arm 44 extending into the through hole 43 is provided at the second end 42 of the bimetal 4. The static contact 42a can be arranged at the free end of the extension arm 44, that is, the end located in the through hole 43. Thus, when the bimetal 4 is deformed due to overload, the moving direction of the static contact 42a is opposite to the moving direction of the second end 42 of the bimetal 4.

[0075] That is to say, when the bimetal 4 is deformed due to overload, the static contact 42a moves away from the contact part 32a following the extension arm 44, and the second end 42 of the bimetal 4 moves close to the contact part 32a, thereby realizing the overload power-off function.

[0076] Correspondingly, by pressing the ratchet button assembly 2, the free end 32 of the elastic contact 3 can be moved, so that the reset linkage 5 is guided to rotate through the connecting arm 51, and the reset arm 52 is deflected synchronously, so as to drive the second end 42 of the bimetal 4 to move and finally reset, so that the static contact 42a moves close to the contact part 32a following the extension arm 44 and finally resets to the preset switch working position.

[0077] It should be noted that the overload condition occurs when the contact portion 32a is connected and energized with the static contact 42a. At this time, both the ratchet button assembly 2 and the elastic contact piece 3 are in the on working position of the push-button switch. For overload reset, it is usually necessary to press the ratchet button assembly 2 so that the free end 32 of the elastic contact piece 3 and the ratchet button assembly 2 move to the off working position of the push-button switch, that is, the position where the free end 32 of the elastic contact piece 3 is away from the static contact 42a of the bimetallic strip 4, which is the pressing stroke for closing the push-button switch in the general understanding.

[0078] Through the position cooperation of the reset linkage 5 with the elastic moving contact piece 3 and the bimetallic strip 4, the reset operation of the bimetallic strip 4 is integrated into the off operation of the ratchet button assembly 2, which can greatly improve the reset operation efficiency. That is to say, there is no need to perform an additional reset operation because pressing the ratchet button assembly 2 after overload prompts the contact portion 32a to leave the mating position with the static contact piece 42a, which is a necessary safety operation. By integrating the reset operation of the bimetallic strip into the off operation of the ratchet button assembly 2, the operation can be simplified and the operation convenience can be improved.

[0079] In some embodiments, in order to make the reset linkage 5 deflect synchronously and drive the second end 42 of the bimetallic strip 4 to reset during the process that the contact portion 32a of the elastic contact piece 3 is away from the static contact 42a of the bimetallic strip 4, the reset linkage 5 can be set as a lever principle mechanism. The contact portion 32a moves the connecting arm, and then drives the reset linkage 5 to deflect, so that the reset arm 52 moves the second end 42 of the bimetallic strip 4.

[0080] Specifically, the reset linkage 5 may include a rotating shaft 53, and the rotating shaft 53 is rotatably connected to the housing 1 as the action fulcrum of the reset linkage 5. The connecting arm 51 and the reset arm 42 can be respectively arranged on the rotating shaft 53 and rotate together with the rotating shaft 53, thus forming a reset linkage mechanism similar to a lever.

[0081] That is, when the connecting arm 51 is driven by the contact portion 32a, it will rotate around the rotating shaft 53 and drive the rotating shaft 5 to rotate. Correspondingly, the reset arm 52 will also rotate around the rotating shaft 53 driven by the rotating shaft 53, so as to be able to move the second end 42 of the bimetallic strip 4 and make the static contact 42a move to reset.

[0082] In some embodiments, in order to reduce the structural complexity of the reset linkage 5, the connecting arm 51 and the reset arm 52 may be disposed on the circumferential side surface of the rotating shaft 53, so that the rotational angular velocities of the connecting arm 51 and the reset arm 52 are equal, and the reset operation stroke is substantially equivalent to the moving stroke of the free end 32 of the elastic contact piece 3, thereby simplifying the specification grading design of the connecting arm 51 and the reset arm 52.

[0083] In some embodiments, in order to reduce the installation space requirement, the contact portion 32a of the rotating shaft 53 and the elastic contact piece 3 may be disposed on the same side of the plate surface of the bimetal sheet 4.

[0084] Generally, the rotating shaft 53 may be disposed across one side of the bimetal sheet 4 along the width direction of the bimetal sheet 4. The width direction of the bimetal sheet 4 is the orthogonal direction of the line connecting the first end 41 and the second end 42 of the bimetal sheet 4, and the length direction of the bimetal sheet 4 is the direction of the line connecting the first end 41 and the second end 42 of the bimetal sheet 4.

[0085] Correspondingly, in the length direction of the bimetal sheet 4, the connecting arm 51 and the reset arm 52 are located on both sides of the rotating shaft 53, so that the deflection directions of the connecting arm 51 and the reset arm 52 will be in the length direction of the bimetal sheet 4, thereby being able to limit the overall length of the key switch to a certain extent.

[0086] In some embodiments, both ends of the rotating shaft 53 are rotatably connected within the housing 1. Correspondingly, the connecting arm 51 and the reset arm 52 may be disposed in the middle region of the rotating shaft 53.

[0087] Generally, in order to simplify the structure, the rotating shaft 53 may be provided as a rod member, and both ends of the rotating shaft 53 are provided as cylindrical shapes to achieve smooth rotation.

[0088] In some embodiments, in order to reduce the interference risk between the reset linkage 5 and the contact portion 32a and take into account the reliability between the reset linkage 5 and the contact portion 32a, the connecting arm 51 may be lapped on the contact portion 32a. During the process of the contact portion 32a moving away from the stationary contact point 42a of the bimetal sheet 4, the contact portion 32a drives the connecting arm 51 to move away from the bimetal sheet 4.

[0089] On the other hand, during the process of the contact portion 32a approaching the bimetal sheet 4, the connecting arm 51 may not move synchronously with the contact portion 32a, that is, the contact portion 32a does not drive the connecting arm 51 to move, and correspondingly the reset linkage 5 will not rotate.

[0090] Therefore, in order to match the reset operation, the reset arm 52 can be arranged on the side where the second end of the bimetal sheet 4 deforms and bends, and a certain distance is maintained; thus, when the bimetal sheet 4 is overloaded and deformed, the second end 42 of the bimetal sheet 4 will move towards the reset arm 52, and even abut and push the reset arm 52 to move, so that when the free end 32 of the elastic contact piece 3 moves away from the bimetal sheet 4, the reset linkage 5 can be pushed to move relatively quickly, realizing efficient and stable reset.

[0091] In some embodiments, in order to improve the connection reliability between the connecting arm 51 and the contact portion 32a, a hook portion 51a can be arranged on the connecting arm 51 for adaptively lapping on the contact portion 32a.

[0092] Generally, the hook portion 51a can be lapped on the side of the contact portion 32a away from the bimetal sheet 4, so that during the process of the contact portion 32a moving away from the bimetal sheet 4, that is, during the stroke of turning off the key switch, the hook portion 51a can stably lap on the contact portion 32a and move in the direction away from the bimetal sheet 4 following the contact portion 32a.

[0093] In some other embodiments, the connecting arm 51 can also be directly connected to the contact portion 32a, and various connection methods such as snap-fitting and bonding can be adopted.

[0094] In some embodiments, in order to facilitate the connection of the hook portion 51a, a hanging arm 32b can be arranged on one side of the contact portion 32a for adaptively hooking the hook portion 51a.

[0095] In some embodiments, the reset arm 52 and the second end 42 of the bimetal sheet 4 can be in a form of non-fixed connection, such as relatively open forms like lapping and abutting, or a certain gap is maintained.

[0096] That is, the reset arm 52 is located on the side where the second end 42 of the bimetal sheet 4 deforms and bends. When the reset linkage 5 moves following the free end 32, the reset arm 52 pushes the second end 42 of the bimetal sheet 4 to move and reset.

[0097] In some embodiments, the reset arm 52 can be arranged as a block-shaped member, having a contact surface adapted to the second end 42 of the bimetal sheet 4 for contacting and pushing the bimetal sheet 4.

[0098] In some embodiments, the bimetallic strip 4 may also adopt other forms of bimetallic strips, but their basic principles are the same. In an overloaded state, the bimetallic strip 4 will deform and shift in a set direction. According to the deformation and shift direction of the second end of the bimetallic strip 4, the reset linkage 5 can be arranged accordingly, so that during the process of driving the contact portion 32a to shift by pressing the ratchet button assembly 2, the reset linkage 5 is synchronously driven to rotate to push and reset the second end 42 of the bimetallic strip 4.

[0099] For example, the bimetallic strip 4 can be set as an integral sheet-like part, with one end fixed in the housing 1 and the other end being a free end. The static contact 42a is fixed on the free end of the bimetallic strip 4 and can move along with the free end of the bimetallic strip 4, approaching or moving away from the contact portion 32a. At this time, the moving direction of the static contact 42a is the same as that of the free end of the bimetallic strip 4.

[0100] When the bimetallic strip 4 is overloaded, the second end of the bimetallic strip 4 and the static contact 42a move away from the contact portion 32a, and the reset arm 52 can be linked to pull the second end of the bimetallic strip 4 close to the contact portion 32a.

[0101] Generally, the reset arm 52 can be arranged on the side of the bimetallic strip 4 away from the contact portion 32a, and in the length direction of the bimetallic strip 4, the reset arm 52 and the connecting arm 51 are located on the same side of the rotating shaft 53. Thus, when the connecting arm 51 follows the contact portion 32a to move away from the bimetallic strip 4, the reset arm 52 pushes the second end 42 of the bimetallic strip 4 to move and reset in the direction of the contact portion 32a, finally driving the static contact 42a to reset.

[0102] In some embodiments, the elastic contact piece 3 and the reset linkage 5 can be arranged at intervals along the length direction of the bimetallic strip 4. For example, the fixed end 31 of the elastic contact piece 3 can be fixed on one side of the first end 41 of the bimetallic strip 4, the free end 32 of the elastic contact piece 3 is suspended in the middle of the bimetallic strip 4, and the reset linkage 5 is located on one side of the second end 42 of the bimetallic strip 4.

[0103] In this application, unless otherwise clearly defined or limited, the first feature being "on" or "under" the second feature may include direct contact between the first and second features, or may include the first and second features not being in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is less than that of the second feature.

[0104] In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of this application.

[0105] It should be noted that all directional indications in the embodiments of this application are only used to explain the relative positional relationship, movement conditions, etc. between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly. In this application, unless otherwise clearly defined or limited, terms such as "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances. In addition, in this application, descriptions such as "first" and "second" are only for descriptive purposes and should not be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of this application, "a plurality of" means two or more, unless otherwise clearly specifically limited.

[0106] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc., mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

[0107] In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0108] Although the embodiments of this application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of this application. The scope of this application is defined by the claims and their equivalents.

Claims

1. A push-button switch, comprising a housing and a ratchet push-button assembly disposed on the housing; characterized in that, The push-button switch further includes: A resilient contact piece, one end of which is mounted on the housing, and the other end is provided with a contact portion, the contact portion abuts against the ratchet button assembly, and the contact portion moves under the drive of the ratchet button assembly; A bimetallic strip, the first end of which is mounted on the housing, and the second end of the bimetallic strip is provided with a stationary contact that is detachably connected to the contact portion. When the bimetallic strip is deformed due to overload, the second end of the bimetallic strip is deformed and displaced to cause the stationary contact to move away from the contact portion; A reset linkage member rotatably disposed on the housing, the reset linkage member having a connecting arm and a reset arm. The connecting arm is used to connect the contact portion, and the reset arm is used to connect the second end of the bimetallic strip. And in a state where the second end of the bimetallic strip is deformed and displaced, during the movement of the contact portion under an external force, the connecting arm drives the reset linkage member to rotate, thereby driving the reset arm to move the second end of the bimetallic strip in a direction opposite to the deformation displacement direction of the second end of the bimetallic strip, so that the stationary contact moves in a direction close to the contact portion; A terminal block disposed on the housing, the terminal block is configured to be electrically connected in a matching manner with an external wire or a plug, and the terminal block and the resilient contact piece are configured to be respectively connected to the neutral wire and the live wire of an external power supply.

2. The push-button switch according to claim 1, characterized in that, The terminal block has a plugging portion configured to be inserted and connected to an external structure.

3. The push-button switch according to claim 1, characterized in that, The terminal block has a crimping portion configured to be crimped with an external wire.

4. The push-button switch according to claim 1, wherein The terminal block has a wire insertion hole configured to receive an external wire to be embedded and pressed.

5. The push-button switch according to claim 4, characterized in that, A crimping arm is provided on the terminal block, the crimping arm extends into the wire insertion hole, and there is a wire insertion gap between the end of the crimping arm and the hole wall of the wire insertion hole.

6. The push-button switch according to claim 4, characterized in that, A crimping arm is provided on the terminal block, the crimping arm extends into the wire insertion hole, and there is a wire insertion gap between the ends of adjacent two crimping arms, and the extending directions of the crimping arms on both sides of the wire insertion gap are obliquely intersecting.

7. The push-button switch according to claim 1, wherein A hook portion is provided on the connecting arm, and a hanging arm is provided on the contact portion, and the hanging arm is cooperatively overlapped with the hook portion.

8. The push-button switch according to claim 1, wherein, The reset linkage member further includes a rotating shaft, the connecting arm and the reset arm are disposed on the circumferential side surface of the rotating shaft, and both ends of the rotating shaft are rotatably connected to the housing.

9. The push-button switch according to any one of claims 2 to 8, characterized in that, The push-button switch further includes an indicator lamp assembly having a first power supply connector and a second power supply connector. The first power supply connector is electrically connected to the resilient contact piece, and the second power supply connector is electrically connected to the terminal block.

10. The push-button switch according to claim 9, characterized in that, The push-button switch further includes a pressing seat, the housing is connected to the pressing end of the ratchet button assembly, the indicator lamp assembly includes an indicator lamp circuit, the second power supply connector is a conductive spring, the indicator lamp circuit is disposed in the pressing seat, one power supply end of the indicator lamp circuit is electrically connected to the first power supply connector, the other power supply end of the indicator lamp circuit abuts against the first end of the conductive spring, and the second end of the conductive spring abuts against the terminal block.

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