Overload protection button switch

Abstract

The utility model discloses a button switch with overload protection. The button switch comprises a housing assembly, a pressing assembly movably arranged on the housing assembly, and a conducting strip assembly arranged in the housing assembly. The conducting strip assembly comprises a movable contact piece which is arranged opposite to the pressing assembly; the static contact assembly comprises a bimetallic strip and an extension edge formed on the bimetallic strip, one end of the extension edge is provided with a static contact arranged relative to the movable contact piece, and the other end of the extension edge is provided with a reset part; the pressing assembly actuates the movable contact piece through pressing, so that the movable contact piece is in contact with the static contact, and the movable contact piece is separated from the static contact when the pressing assembly is reset; the extension edge is set to be bent under an overload condition, so that the static contact moves away from the movable contact piece and is separated from the movable contact piece, and the reset part is bent along with the extension edge and moves in the direction close to the pressing assembly; the overload protection device further comprises a reset rod, the reset rod is arranged to act towards the reset part along with pressing of the pressing assembly, the reset rod abuts against the reset part under the overload condition when the pressing assembly is reset, the extending edge is made to return to the initial state, and when the pressing assembly is reset and pressed, the reset rod abuts against the reset part under the overload condition, and the reset rod is made to return to the initial state. And the extension edge returns to the initial state.

Description

Technical Field

[0001] The utility model relates to the technical field of push button switches, in particular to an overload protection push button switch. Background Art

[0002] At present, power strips and sockets on the market usually have a push button switch to control the on and off of the circuit of the corresponding socket. When the push button switch is pressed in the initial position, the pressed position is maintained by the internal ratchet structure. At this time, the internal conductive sheet is electrically connected to power on. When the power needs to be cut off, the button switch in the pressed position is further pressed, and the ratchet structure is bounced up by the spring. At this time, the button switch returns to the initial position, and the conductive sheets are disconnected from each other, thereby cutting off the power.

[0003] On the basis of the above, overload protection needs to be set on the power strips and sockets to further reduce safety risks.

[0004] A push button switch with overload protection in the prior art has a bimetallic strip disposed inside, which can bend under overload conditions to achieve overload protection. In addition, a hook member is disposed at the bottom of the button, and a moving contact piece is connected to the hook member. When the hook member is pressed, the moving contact piece is abutted against the stationary contact piece, and when reset, the bent bimetallic strip can be hooked up and reset. Although overload protection is achieved, the hook member is difficult to assemble because it needs to be connected not only to the moving contact piece but also to the ratchet button structure, and the housing of the push button switch itself is buckled up and down, which makes assembly extremely inconvenient, and the position of the hook member cannot be well guaranteed, and it is easy to interfere with the assembly work of the housing and deviate;

[0005] Another push button switch with overload protection in the prior art has an independent reset button arranged on the outside of the button. Although it solves the assembly problem to a certain extent, it requires an additional reset operation. If the user only operates the reset button when overloaded, the bimetallic strip may reset under the overload condition, or directly reach the power-on position after resetting, causing unnecessary damage to the appliance. Utility Model Content

[0006] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a push button switch with overload protection.

[0007] The above technical objectives of the utility model are achieved through the following technical solutions: A push button switch for overload protection comprises a housing assembly, a pressing assembly movably arranged on the housing assembly, and a conductive sheet assembly arranged in the housing assembly;

[0008] The conductive sheet assembly comprises:

[0009] A moving contact piece, the moving contact piece is arranged relative to the pressing component;

[0010] The stationary contact assembly comprises a bimetallic sheet and an extended edge formed on the bimetallic sheet, wherein one end of the extended edge is provided with a stationary contact point arranged relative to the moving contact sheet, and the other end of the extended edge is provided with a reset portion;

[0011] The pressing component actuates the movable contact piece by pressing, so that the movable contact piece contacts with the stationary contact point, and the movable contact piece separates from the stationary contact point when the pressing component is reset;

[0012] The extension edge is configured to bend under an overload condition so that the static contact moves away from the moving contact piece and separates from the moving contact piece, and the reset portion moves in a direction close to the pressing component as the extension edge bends;

[0013] It also includes a reset rod, which is arranged to move toward the reset part as the pressing assembly is pressed, and the reset rod presses the reset part under the overload condition when the pressing assembly is reset, so as to cause the extended edge to return to the initial state.

[0014] When the pressing assembly is pressed for resetting, the reset rod presses the reset portion under the overload condition and causes the extended edge to return to the initial state.

[0015] Furthermore, the reset portion is spaced apart from the end of the reset rod in a non-overload state.

[0016] Furthermore, the reset portion contacts the end of the reset rod or is close to the end of the reset rod in the overload state.

[0017] Furthermore, the reset rod is arranged through the housing component, and one end of the reset rod is connected to the pressing component, and the other end of the reset rod is located in the housing and arranged toward the reset portion.

[0018] Furthermore, the bimetallic strip includes a frame, the extended edge extends from one end of the frame, and the reset portion is arranged on the frame, the static contact is arranged on the free end of the extended edge, and the static contact assembly also includes a first static contact piece arranged in the shell assembly, and one end of the frame away from the reset portion is connected to the first static contact piece.

[0019] Furthermore, a supporting spring is sleeved on the reset rod, the upper end of the supporting spring abuts against the reset rod, and the lower end of the supporting spring abuts against the housing assembly.

[0020] Furthermore, the reset portion extends on both sides of the extending edge, the reset rods are correspondingly arranged on both sides of the extending edge, and the movable contact piece is arranged between the reset rods.

[0021] Furthermore, a light board assembly is arranged in the pressing assembly, and the light board assembly is energized when the moving contact piece contacts the static contact point, and is de-energized when the moving contact piece separates from the static contact point.

[0022] Furthermore, the stationary contact assembly further includes a second stationary contact piece, which is located in the housing assembly and arranged above the moving contact piece.

[0023] Furthermore, a first conductive spring and a second conductive spring are provided on the shell assembly, the upper ends of the first conductive spring and the second conductive spring are in electrical contact with the lamp board assembly, the lower end of the first conductive spring is in electrical contact with the first static contact piece, and the lower end of the second conductive spring is in electrical contact with the second static contact piece.

[0024] Compared with the prior art, the utility model has the following advantages and beneficial effects: the push button switch of the utility model is provided with a bimetallic sheet inside, so that the bimetallic sheet is bent away from the moving contact piece under an overload condition, so that the static contact is separated from the moving contact piece, and the reset portion located at the far end of the static contact is bent toward the direction of the pressing component, ready to be pressed and reset by the reset pressing action of the pressing component, and at the same time, a reset rod is provided on the side of the pressing component, and during assembly, it is only necessary to connect the reset rod to the pressing component and assemble it to the housing together, without interfering with the assembly of the housing, and the operation is simple and convenient;

[0025] When resetting is required, the resetting rod is driven by the pressing assembly and moves together, thereby pressing the bent and upward resetting part, and then causing the static contact part at the other end to deform upward and reset. At this time, the pressing assembly completes the resetting action, and the moving contact piece is separated from the static contact and is in a power-off state, which effectively improves safety. The resetting of the resetting rod is synchronously achieved by the resetting press of the pressing assembly, and only one resetting press is required, simplifying the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0027] Figure 2 It is a schematic diagram of the internal structure of the utility model;

[0028] Figure 3 It is a cross-sectional view of the movable contact piece and the static contact of the utility model in a normal disconnected state;

[0029] Figure 4 It is a cross-sectional view of the movable contact piece and the static contact of the utility model in a normal power-on state;

[0030] Figure 5 It is a cross-sectional view of the movable contact piece and the stationary contact of the utility model under overload conditions;

[0031] Figure 6 It is a cross-sectional view of another angle of the movable contact piece and the static contact of the utility model in the normal disconnected state;

[0032] Figure 7It is a cross-sectional view of the movable contact piece and the static contact of the utility model at another angle in the normal power-on state;

[0033] Figure 8 It is a cross-sectional view of the movable contact piece and the static contact of the utility model at another angle under overload condition;

[0034] Fig. 9 It is a structural schematic diagram of the upper shell of the utility model;

[0035] In the figure: 1. housing assembly; 1.1. guide column; 1.2. offset portion; 1.3. abutment end surface; 1.4. through hole; 1.5. ratchet sleeve;

[0036] 2. Pressing assembly; 2.1. Bottom plate; 2.2. Lamp cap;

[0037] 3. Conductive sheet assembly; 3.1. Moving contact sheet; 3.2. Bimetallic sheet; 3.21. Extended edge; 3.22. Static contact point; 3.23. Reset portion; 3.24. Frame; 3.3. First static contact sheet; 3.4. Second static contact sheet;

[0038] 4. Reset rod; 4.1. Connecting column; 4.2. Abutment step;

[0039] 5. Support spring;

[0040] 6. Light board assembly; 7. First conductive spring; 8. Second conductive spring;

[0041] 9. Ratchet structure; 9.1. First ratchet; 9.2. Second ratchet; 9.3. Return spring; DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0043] It should be understood that although the terms upper, middle, lower, top, end, etc. appear in this article to describe various elements, these elements are not limited by these terms. These terms are only used to distinguish elements from each other for easy understanding, and are not used to define any direction or order limitation.

[0044] like Figure 1-9As shown, a push button switch for overload protection comprises a housing assembly 1, a pressing assembly 2 movably arranged on the housing assembly 1, and a conductive sheet assembly 3 arranged in the housing assembly 1, wherein the pressing assembly 2 adopts a ratchet switch, which is used to be operated by a user and has an initial position and at least one pressing position of being pressed downward by a pressing operation;

[0045] The conductive sheet assembly 3 comprises:

[0046] A movable contact piece 3.1, the movable contact piece 3.1 is arranged opposite to the pressing component 2;

[0047] The stationary contact assembly comprises a bimetallic strip 3.2 and an extended edge 3.21 formed on the bimetallic strip 3.2, wherein a stationary contact point 3.22 arranged relative to the moving contact strip 3.1 is arranged at one end of the extended edge 3.21, and a reset portion 3.23 is arranged at the other end of the extended edge 3.21;

[0048] The pressing component 2 actuates the movable contact piece 3.1 by pressing, so that the movable contact piece 3.1 contacts the stationary contact point 3.22, and the movable contact piece 3.1 is separated from the stationary contact point 3.22 by the resetting pressing action of the pressing component 2;

[0049] The extension edge 3.21 is configured to bend under overload conditions so that the static contact 3.22 moves away from the movable contact piece 3.1 and separates from the movable contact piece 3.1, and the reset portion 3.23 moves in the direction of bending with the extension edge 3.21 and approaching the pressing component 2.

[0050] It should be noted that the bimetallic strip 3.2 can be composed of two layers of metal sheets with different expansion coefficients. When the ambient temperature changes, the two layers of metal sheets expand or contract due to the temperature change, causing the bimetallic strip 3.2 to bend and deform. When the temperature rises, the deformation of the metal sheet with a large expansion coefficient is greater than the deformation of the metal sheet with a small expansion coefficient. The metal sheet with a large expansion coefficient can squeeze the metal sheet with a small expansion coefficient and bend synchronously. In the present invention, at least the extended edge 3.21 is deformed, so that when overloaded, the static The bimetallic strip 3.2 of the contact assembly heats up due to the excessive current and bends. The static contact 3.22 at the end of the extended edge 3.21 is deformed and bent away from the moving contact piece 3.1, thereby achieving the overload power-off protection function, and the reset portion 3.23 located at the extended edge 3.21 away from the static contact 3.22 is opposite to the bending direction of the static contact 3.22. For example, the static contact 3.22 bends downward to separate from the moving contact piece 3.1 above, and the reset portion 3.23 bends upward, ready to be reset by the force from pressing.

[0051] In order to realize the resetting of the bimetallic strip 3.2 in the bending protection state, a resetting rod 4 is also included. The resetting rod 4 is arranged to move toward the resetting portion 3.23 as the pressing component 2 is pressed, and the resetting rod 4 presses the resetting portion 3.23 under the overload condition when the pressing component 2 is reset and pressed, and causes the extended edge 3.21 to return to the initial state.

[0052] Preferably, the reset rod 4 is connected to the pressing assembly 2, so that the pressing action of the pressing assembly 2 can drive the reset rod 4 downward, so that the reset rod 4 can contact the reset part 3.23 during the downward stroke, thereby achieving the reset pressing action on the reset part 3.23.

[0053] When resetting is required, the resetting rod 4 is driven by the pressing assembly 2 to move together, thereby pressing the bent and upward resetting portion 3.23, driving the resetting portion 3.23 to bend downward and reset, thereby causing the static contact 3.22 at the other end to deform upward and reset. At this time, the pressing assembly 2 completes the resetting action, and the moving contact piece 3.1 loses the pressure of the pressing assembly 2 and separates from the static contact 3.22, and is in a power-off state. The resetting of the bimetallic strip 3.2 after overload and the power-off of the switch only require one resetting press, so as to solve the inconvenience caused by the need to operate the resetting rod 4 alone.

[0054] Thanks to the setting position of the reset rod 4 corresponding to the reset portion 3.23, the assembly of the reset rod 4 can be avoided inside the shell assembly 1 and near the movable contact piece 3.1 and the static contact 3.22. It is only necessary to connect the reset rod 4 to the pressing assembly 2 and cooperate with the pressing assembly 2 on the shell assembly 1.

[0055] like Figure 5 and Figure 8 As shown, as a further explanation of the extended edge 3.21, under an overload condition, the static contact 3.22 on the extended edge 3.21 bends downward, and correspondingly, the reset portion 3.23 on the extended edge 3.21 bends upward, so that the reset portion 3.23 moves toward the pressing component 2 so as to be pressed and actuated, thereby resetting the extended edge 3.21 to its initial position, which specifically refers to the position where the moving contact piece 3.1 can be pressed by the pressing component 2 to contact the static contact 3.22 under normal conditions.

[0056] like Figure 3 and Figure 6 As shown, in other embodiments, the extended edge 3.21 has a posture of tilting upward from the reset portion 3.23, thereby providing a space for the static contact 3.22 to bend downward under an overload condition.

[0057] like Figure 2As shown, the free end of the moving contact piece 3.1 is located directly above the static contact 3.22 on the extended edge 3.21, and the reset portion 3.23 on the extended edge 3.21 is away from the free end of the moving contact piece 3.1, so that the reset rod 4 can be away from the ratchet structure 9 of the pressing assembly 2, as well as the position of the docking axis of the moving contact piece 3.1 and the static contact 3.22, effectively avoiding assembly interference.

[0058] like Figure 3 , Figure 4 , Figure 6 , Figure 7 As shown, in other embodiments, a relative position setting is provided between the extended edge 3.21 and the reset rod 4, and the reset portion 3.23 is spaced from the end of the reset rod 4 in a non-overload state, thereby providing space for the reset portion 3.23 to bend upward. Under this setting, the reset portion 3.23 can bend upward under an overload condition without causing the reset rod 4 to rise, thereby preventing the extended edge 3.21 from failing due to overload bending, thereby avoiding the situation where the independently arranged reset button cannot return to its position when being blocked by foreign objects, resulting in the generation of safety hazards.

[0059] Of course, even if the above-mentioned spacing space is arranged, the reset rod 4 can still actuate the upwardly bent reset portion 3 . 23 under the normal reset operation of the pressing assembly 2 .

[0060] As another variation, a certain floating space can be provided for the reset rod 4 on the pressing assembly 2, so that the bending upward movement of the reset portion 3.23 under the overload condition can drive the reset rod 4, thereby ensuring the contact between the reset portion 3.23 and the reset rod 4 under the overload condition, and realizing the rapid reset of the reset portion 3.23 when the pressing assembly 2 performs the reset pressing operation.

[0061] In other embodiments, the reset portion 3.23 bends upward under an overload condition and contacts the end of the reset rod 4, ensuring the contact between the reset portion 3.23 and the reset rod 4 under an overload condition, and realizing rapid reset of the reset portion 3.23 when the pressing assembly 2 performs a reset pressing operation.

[0062] like Figure 5 and Figure 8 As shown, as another variation, the reset portion 3.23 may also be bent to a position close to the bottom end of the reset rod 4, or to a position about to contact the bottom end of the reset rod 4 under an overload condition, so as to avoid possible interference with the reset rod 4 or other components in the housing assembly 1 when bending upward.

[0063] like Figures 6 to 8As shown, as an arrangement of the reset rod 4, the reset rod 4 is arranged in the shell assembly 1, and a through hole 1.4 for the reset rod 4 to pass through is provided on the shell assembly 1. The reset rod 4 is preferably arranged vertically, and one end of the reset rod 4 is connected to the pressing assembly 2, and the other end of the reset rod 4 is located in the shell and arranged toward the reset portion 3.23.

[0064] Specifically, the reset rod 4 has a connecting column 4.1 inserted into the pressing assembly 2. Through the cooperation between the connecting column 4.1 and the pressing assembly 2, the relative position of the reset rod 4 and the pressing assembly 2 can be maintained to a certain extent, so that the reset rod 4 can be assembled on the housing assembly 1 together with the pressing assembly 2.

[0065] like Figures 3 to 5 As shown, as an example of an assembly method, the pressing component 2 has a bottom plate 2.1, and two guide posts 1.1 are extended upwardly from the housing component 1. The bottom plate 2.1 is provided with guide holes corresponding to the guide posts 1.1, and an offset portion 1.2 is provided at the end of the guide post 1.1. The bottom of the pressing component 2 can press against the end of the guide post 1.1 and pass through the guide post 1.1, and finally limit the position with the bottom end of the offset portion 1.2. The offset portion 1.2 is specifically a portion radially extending from the guide post 1.1. Under the action of the ratchet assembly in the pressing component 2, the pressing component 2 is abutted against the bottom end of the offset portion 1.2 at the initial position;

[0066] As for the reset rod 4 , it can be inserted into the housing assembly 1 together with the pressing assembly 2 through preliminary cooperation with the pressing assembly 2 , that is, the reset rod 4 is inserted into the through hole 1 . 4 on the housing assembly 1 .

[0067] Of course, the pressing component 2 and the housing component 1 may also be assembled in other ways, and it is only necessary to movably fit the pressing component 2 on the housing component 1 .

[0068] As a further improvement to the reset rod 4, a supporting spring 5 is sleeved on the reset rod 4, the upper end of the supporting spring 5 abuts against the reset rod 4, and the lower end abuts against the housing assembly 1, wherein the supporting spring 5 plays an upward supporting role for the reset rod 4, so that in the initial position of the pressing assembly 2, the reset rod 4 is lifted upward and spaced from the reset portion 3.23. At the same time, after the pressing assembly 2 is self-pressed and reset, an upward reset force is provided for the reset rod 4, and it is ensured that the pressing assembly 2 can drive the reset rod 4 to move together when the reset pressing is downward.

[0069] like Figure 2 As shown, the reset rod 4 has an abutment step 4.2, and the through hole 1.4 of the housing assembly 1 is provided with an abutment end surface 1.3, so as to abut the two ends of the support spring 5, and the lower end of the support spring 5 can be placed in the through hole 1.4 to play a guiding and limiting role.

[0070] In addition, by means of the function of the supporting spring 5 , the reset rod 4 with the supporting spring 5 can also be pre-placed on the housing assembly 1 , waiting for the installation of the pressing assembly 2 .

[0071] During the assembly process, the reset rod 4 can preferably be inserted into the through hole 1 . 4 of the housing assembly 1 to ensure the reset stability of the reset rod 4 during the assembly process.

[0072] Preferably, based on the above embodiment, the reset rod 4 moves downward to the initial position of the reset portion 3.23 along with the reset pressing action of the pressing assembly 2, thereby ensuring that the bimetallic strip 3.2 reaches the initial position.

[0073] In other embodiments, the upper end of the reset rod 4 may also be interference fit with the bottom plate 2 . 1 of the pressing assembly 2 , or be integrally connected thereto.

[0074] As a further implementation of the bimetallic strip 3.2, the bimetallic strip 3.2 includes a frame 3.24, an extended edge 3.21 extends from one end of the frame 3.24, and a reset portion 3.23 is arranged on the frame 3.24. The frame 3.24 is specifically enclosed around the extended edge 3.21, and the middle portion of the frame 3.24 is hollow, thereby providing better support for the initial posture of the extended edge 3.21 and the bending deformation posture.

[0075] The end of the extended edge 3.21 forms a free end located in the middle of the frame 3.24, which has an upward tilted posture under normal conditions. The static contact 3.22 is arranged on the free end of the extended edge 3.21, and the reset portion 3.23 is normally located lower than the free end. The static contact assembly also includes a first static contact piece 3.3 arranged in the shell assembly 1, and one end of the frame 3.24 away from the reset portion 3.23 is connected to the first static contact piece 3.3.

[0076] The first stationary contact piece 3.3 and the moving contact piece 3.1 are connected to the live wire, so that when the pressing component 2 is in the pressing position, the moving contact piece 3.1, the bimetallic strip 3.2 and the first stationary contact piece 3.3 are conductive and energized.

[0077] As a further optimization of the position of the conductive sheet assembly 3,

[0078] The reset portion 3.23 extends on both sides of the extended edge 3.21, corresponding to the end of the frame 3.24 away from the first static contact piece 3.3. There are two reset rods 4, and the reset rods 4 are correspondingly arranged on both sides of the extended edge 3.21, thereby optimizing the internal space of the shell assembly 1, and the two reset rods 4 further improve the movement stability of the pressing assembly 2 and the reset rod 4, and the reliability of the pressing and resetting effect of the reset portion 3.23.

[0079] Preferably, the movable contact piece 3.1 is arranged between the reset rods 4, and the vertical projection of the movable contact piece 3.1 coincides with the extended edge 3.21, so that the reset rod 4 and the reset portion 3.23 effectively avoid the position of the movable contact piece 3.1, improving assembly convenience.

[0080] In the above embodiment, the reset rod 4 can be two independent rod bodies, which are respectively connected to the pressing assembly 2 and pass through the shell assembly 1, or it can be an integral component, and the two rod bodies are connected by a limiting step at the upper end and connected to the pressing assembly 2.

[0081] The upper end of the reset rod 4 is specifically connected to the bottom plate 2 . 1 of the pressing assembly 2 .

[0082] As a further improvement to the push button switch, a light board assembly 6 is arranged in the pressing assembly 2, and the pressing assembly 2 also includes a lamp cap 2.2. The light board assembly 6 can be arranged between the lamp cap 2.2 and the base plate 2.1. The light board assembly 6 is energized when the moving contact piece 3.1 contacts the static contact 3.22, and is de-energized when the moving contact piece 3.1 separates from the static contact 3.22, so that the light board assembly 6 can serve as a prompt for the on and off of the power supply. Push button switches with lights have been widely used in the prior art and will not be explained in detail here.

[0083] Specifically, the stationary contact assembly also includes a second stationary contact piece 3.4, which is located in the shell assembly 1 and arranged above the moving contact piece 3.1. The shell assembly 1 includes an upper shell and a lower shell that are connected to each other. The second stationary contact piece 3.4 is preferably abutted between the upper shell and the lower shell of the shell assembly 1, and is arranged perpendicular to the free end of the internal moving contact piece 3.1.

[0084] Preferably, the second stationary contact piece 3.4 is arranged between the ratchet structure 9 and the reset rod 4 of the push switch, thereby effectively reducing the volume of the push switch.

[0085] Specifically, the shell assembly 1 is provided with a first conductive spring 7 and a second conductive spring 8, the upper ends of the first conductive spring 7 and the second conductive spring 8 are electrically in contact with the lamp board assembly 6, the lower end of the first conductive spring 7 is electrically in contact with the first static contact piece 3.3, and the lower end of the second conductive spring 8 is electrically in contact with the second static contact piece 3.4.

[0086] Optionally, the second stationary contact piece 3.4 is connected to the neutral line.

[0087] The two conductive springs provide further support for the pressing assembly 2 and a return function after pressing and resetting, thereby improving the position stability of the pressing assembly 2.

[0088] Specifically, the first conductive spring 7 abuts against a portion of the frame 3.24 of the bimetallic strip 3.2 corresponding to the first stationary contact piece 3.3.

[0089] In the above-mentioned embodiment, the pressing component 2 is specifically selected as a ratchet structure 9, and a ratchet sleeve 1.5 corresponding to the ratchet structure 9 is provided on the housing component 1. The ratchet structure 9 includes an upper first ratchet 9.1 and a lower second ratchet 9.2. The first ratchet 9.1 is sleeved outside the second ratchet 9.2, and a reset spring 9.3 is provided inside the second ratchet 9.2. The structures of the first ratchet 9.1 and the second ratchet 9.2 have been widely used in the prior art and will not be described in detail here. The upper end of the reset spring 9.3 abuts inside the second ratchet 9.2, and the lower end of the reset spring 9.3 abuts on the movable contact piece 3.1. The upper end of the first ratchet 9.1 abuts against the pressing component 2;

[0090] Thus, the ratchet structure 9 drives the pressing assembly 2 toward the initial position by means of the return spring 9.3.

[0091] When the pressing assembly 2 is pressed from the initial position, the first ratchet 9.1 and the second ratchet 9.2 move downward, and at the same time, the return spring 9.3 is pressed by the second ratchet 9.2 to act on the movable contact piece 3.1, thereby causing the movable contact piece 3.1 to move downward and contact the static contact 3.22. At this time, the first ratchet 9.1 and the second ratchet 9.2 are locked in the ratchet sleeve 1.5, thereby maintaining the pressure on the movable contact piece 3.1 and maintaining the power-on state;

[0092] The pressing assembly 2 is reset, so that the first ratchet 9.1 and the second ratchet 9.2 move downward again, and the second ratchet 9.2 is unlocked under the guidance of the ratchet sleeve 1.5, and then the first ratchet 9.1 and the second ratchet 9.2 are pushed upward under the action of the reset spring 9.3. At this time, the moving contact piece 3.1 loses its pressing effect and returns upward, thereby breaking away from the contact with the static contact 3.22.

[0093] Under overload conditions, the extended edge 3.21 on the bimetallic strip 3.2 is bent and deformed, and the static contact 3.22 on the free end of the extended edge 3.21 with a pre-deformed posture is bent downward and away from the moving contact 3.1, and the reset portion 3.23 at the root of the extended edge 3.21 is bent and deformed upward and close to the reset rod 4, and the power is cut off at this time;

[0094] When the push button switch needs to be reset after overload protection, the reset action is the same as the above, wherein the reset rod 4 is pressed downward together with the pressing assembly 2, and abuts against the upwardly bent reset portion 3.23, so that the reset portion 3.23 bends downward to reset, and at the same time, the static contact 3.22 integrally extending at the far end of the reset portion 3.23 bends upward to reset and return to the initial position. At this time, through the pressing action of the pressing assembly 2, the moving contact piece 3.1 can contact the static contact 3.22 again to energize.

[0095] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A push button switch with overload protection, characterized in that: It comprises a housing component (1), a pressing component (2) movably arranged on the housing component (1), and a conductive sheet component (3) arranged in the housing component (1); The conductive sheet assembly (3) comprises: A movable contact piece (3.1), wherein the movable contact piece (3.1) is arranged relative to the pressing component (2); A stationary contact assembly comprises a bimetallic sheet (3.2) and an extended edge (3.21) formed on the bimetallic sheet (3.2), one end of the extended edge (3.21) being provided with a stationary contact point (3.22) arranged relative to the moving contact sheet (3.1), and the other end of the extended edge (3.21) being provided with a reset portion (3.23); The pressing component (2) actuates the moving contact piece (3.1) by pressing, so that the moving contact piece (3.1) contacts the static contact point (3.22), and the moving contact piece (3.1) separates from the static contact point (3.22) when the pressing component (2) is reset; The extended edge (3.21) is configured to bend under an overload condition so that the static contact (3.22) moves away from the moving contact piece (3.1) and is separated from the moving contact piece (3.1), and the reset portion (3.23) moves in a direction close to the pressing component (2) as the extended edge (3.21) bends; It also comprises a reset rod (4), which is arranged to move towards the reset portion (3.23) as the pressing assembly (2) is pressed, and the reset rod (4) presses the reset portion (3.23) under an overload condition and causes the extended edge (3.21) to return to an initial state.

2. The overload protection push button switch according to claim 1, characterized in that: The reset portion (3.23) is spaced apart from the end of the reset rod (4) in a non-overload state.

3. The overload protection push button switch according to claim 1, characterized in that: The reset portion (3.23) contacts the end of the reset rod (4) or is close to the end of the reset rod (4) in an overload state.

4. The overload protection push button switch according to claim 1, characterized in that: The reset rod (4) is arranged to penetrate the housing component (1), and one end of the reset rod (4) is connected to the pressing component (2), and the other end of the reset rod (4) is located in the housing and is arranged toward the reset portion (3.23).

5. The overload protection push button switch according to claim 1, characterized in that: The bimetallic strip (3.2) comprises a frame (3.24), the extended edge (3.21) extends from one end of the frame (3.24), the reset portion (3.23) is arranged on the frame (3.24), the static contact (3.22) is arranged on the free end of the extended edge (3.21), the static contact assembly further comprises a first static contact piece (3.3) arranged in the housing assembly (1), and one end of the frame (3.24) away from the reset portion (3.23) is connected to the first static contact piece (3.3).

6. The overload protection push button switch according to claim 1, characterized in that: A supporting spring (5) is sleeved on the reset rod (4); the upper end of the supporting spring (5) abuts against the reset rod (4), and the lower end abuts against the housing assembly (1).

7. The overload protection push button switch according to claim 1, characterized in that: The reset portion (3.23) extends on both sides of the extended edge (3.21), the reset rod (4) is correspondingly arranged on both sides of the extended edge (3.21), and the movable contact piece (3.1) is arranged between the reset rods (4).

8. The overload protection push button switch according to claim 1, characterized in that: A light board assembly (6) is arranged in the pressing assembly (2), and the light board assembly (6) is energized when the moving contact piece (3.1) contacts the static contact point (3.22), and is de-energized when the moving contact piece (3.1) and the static contact point (3.22) separate.

9. The overload protection push button switch according to claim 8, characterized in that: The stationary contact assembly also includes a second stationary contact piece (3.4), which is located in the housing assembly (1) and arranged above the moving contact piece (3.1).

10. The overload protection push button switch according to claim 9, characterized in that: The housing component (1) is provided with a first conductive spring (7) and a second conductive spring (8); the upper ends of the first conductive spring (7) and the second conductive spring (8) are electrically connected to the lamp board component (6); the lower end of the first conductive spring (7) is electrically in contact with the first static contact piece (3.3); and the lower end of the second conductive spring (8) is electrically connected to the second static contact piece (3.4).

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