Button switch with overload reset function

Abstract

The utility model discloses a button switch with an overload reset function, which comprises a shell assembly forming an inner cavity, a contact piece assembly restrained in the inner cavity, and a button assembly for controlling the on-off of the contact piece assembly, the contact piece assembly comprises a bimetallic strip and a movable contact piece arranged opposite to the button assembly, the bimetallic strip at least comprises a protection end and a static contact end arranged opposite to the movable contact piece, the static contact end is connected with the protection end, and the protection end is bent in an overload state and drives the static contact end to be separated from the movable contact piece; the reset rod is arranged in the shell assembly in a penetrating mode, the spring is supported on the reset rod, the reset rod is actuated by the button assembly to slide, the protection end is located in the sliding stroke of the reset rod in the overload state, the reset rod is provided with at least one limiting part, and a limiting matching part is arranged in the shell assembly; the limiting part abuts against the limiting matching part, and the reset rod is kept at the initial position.

Description

TECHNICAL FIELD

[0001] The utility model relates to switch technical field, concretely relates to a button switch with overload reset function. BACKGROUND

[0002] Overload protection refers to the overload protection device for preventing the protector from being damaged due to overheating of the main power line. The overload protection switch is suitable for protecting household, industrial and other electronic and electrical safety. If the voltage is unstable or other electronic components are defective, etc. It can cause excessive current, which can easily damage electronic components and cause damage, and is more likely to burn out, causing short circuit and even electric shock, causing fire and other accidents.

[0003] On the basis of the above, overload protection needs to be provided on the extension socket and the socket to further reduce the security risks. A button switch with overload protection in the prior art has a bimetallic strip provided inside. The bimetallic strip can bend under overload conditions, thereby achieving overload protection.

[0004] For this kind of button switch, an additional reset rod needs to be provided after overload occurs. However, the position of the reset rod on the button switch in the existing design is unstable, especially in the initial state, which causes the reset action to be not smooth. Another button switch in the prior art provides stability of the reset rod in the horizontal direction by providing two spring members on the reset rod. However, this method increases the assembly difficulty to some extent. SUMMARY

[0005] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a button switch with overload reset function.

[0006] The above technical purpose of the utility model is achieved by the following technical scheme: a button switch with overload reset function, comprising:

[0007] The button switch comprises a housing assembly constituting an inner cavity, a contact piece assembly constrained in the inner cavity, and a button assembly controlling the on-off of the contact piece assembly. The contact piece assembly comprises a bimetallic strip, a moving contact piece arranged opposite to the button assembly, and a static contact end arranged opposite to the moving contact piece. The static contact end is connected to the protection end. The protection end is arranged to bend under overload conditions and drive the static contact end to separate from the moving contact piece.

[0008] The reset rod is arranged in the shell assembly, and the spring is supported on the reset rod.

[0009] Further, the matching position of the limiting matching part and the limiting part is above the energized state of the protection end, the spring applies a force to make the limiting part abut against the limiting matching part, and the reset rod is suspended in the shell assembly at the initial position.

[0010] Further, the lower end of the reset rod is arranged to be spaced from the protection end at the initial position, and / or the upper end of the reset rod is arranged to be spaced from the button assembly.

[0011] Further, the reset rod comprises at least one rod body, and the limiting part extends radially on one side of the rod body.

[0012] Further, the reset rod comprises two rod bodies arranged adjacently, and an abutting part connected to the upper ends of the two rod bodies, the abutting part is provided with a supporting surface matched with the button assembly, and the spring is abutted between the two rod bodies.

[0013] Further, the rod body is provided with a notch part in a direction opposite to the extending direction of the limiting part.

[0014] Further, the radial extending directions of the limiting parts on the two rod bodies are arranged to be opposite to each other.

[0015] Further, the limiting part is arranged in the shell assembly with the reset rod, the shell assembly comprises an upper shell and a base which are relatively combined, and the limiting matching part is arranged on the inner side of the upper shell.

[0016] Further, the contact piece assembly further comprises a first static contact piece overlapped with the bimetallic sheet, the limiting part is arranged in the shell assembly with the reset rod, the shell assembly is provided with a bearing seat for bearing the first static contact piece, and the limiting matching part is arranged on the bearing seat.

[0017] Further, the shell assembly is provided with a guide seat extending in the sliding direction of the reset rod, and the spring and / or the reset rod is arranged in the guide seat.

[0018] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0019] The button switch of the utility model, through setting bimetallic strip in the inside, the static contact end and the protection end of bimetallic strip are connected, under the overload state, the bending of protection end will drive static contact end action, make static contact end and moving contact piece separate, at this moment the bending action of protection end is towards reset rod direction, make protection end enter reset rod press action stroke of button assembly, when press button assembly again after power off, button assembly will drive reset rod downlink, and press protection end, make protection end reposition, at this moment static contact end synchronous action, and reposition to the position of with moving contact piece joint, effectively improve security, the reset of reset rod is synchronous through the reset press of button assembly, only need once reset press, simplify operation.

[0020] The reset rod of the utility model is abutted with the limiting matching part in the shell assembly through the limiting part thereon, and is tightly abutted therebetween under the action of the spring, thereby maintaining the posture of the reset rod at the initial position, which is conducive to maintaining the stability of the reset rod, and by controlling the matching position of the limiting part and the limiting matching part, the reset rod can be spaced from the button assembly or the protection end in the working state at the initial position, so as to avoid interference in the assembly process and the sliding process. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is the whole structure schematic view of the utility model;

[0022] Figure 2 It is the side view of the utility model;

[0023] Figure 3 It is the sectional view of the utility model;

[0024] Figure 4 It is the schematic view of bimetallic strip under the overload and power-on state of the utility model;

[0025] Figure 5 It is the structure schematic view after the shell assembly of the utility model is removed;

[0026] Figure 6 It is another whole structure schematic view of the utility model;

[0027] Figure 7 It is the cooperation schematic view of base and contact piece assembly of the utility model;

[0028] Figure 8 It is the structure schematic view of reset rod of the utility model;

[0029] Figure 9 It is the explosion schematic view of the utility model;

[0030] Figure 10 It is the explosion schematic view of second limiting channel and moving contact piece of the utility model;

[0031] In the diagram: 1. Housing assembly; 1.1. Upper shell; 1.2. Base; 1.3. Bearing seat; 1.4. Guide seat; 1.5. Guide hole; 1.6. Groove;

[0032] 2. Contact assembly; 2.1. Bimetallic strip; 2.21. Protective end; 2.22. Stationary contact end; 2.2. Moving contact; 2.3. First stationary contact; 2.4. Second stationary contact;

[0033] 3. Button component;

[0034] 4. Reset rod; 4.1. Limiting part; 4.2. Rod body; 4.21. Notch part; 4.22. First section; 4.23. Second section; 4.3. Abutting part; 4.31. Supporting surface;

[0035] 5. Spring;

[0036] 6. Limiting and fitting parts;

[0037] 7. Limiting support; 7.1. First limiting channel; 7.2. Second limiting channel; 7.3. Third limiting channel; 7.4. Limiting stop;

[0038] 8. Lamp panel assembly; 8.1. Conductive spring; 9. Ratchet structure; 9.1. First ratchet; 9.2. Second ratchet; 9.3. Return spring; Detailed Implementation

[0039] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0040] It should be understood that although the terms upper, middle, lower, top, one end, etc., appear in this document to describe various elements, these elements are not limited by these terms. These terms are only used to distinguish the elements from each other for ease of understanding, and are not used to define any directional or sequential restrictions.

[0041] like Figures 1-10 As shown, a push-button switch with overload reset function includes:

[0042] The device includes a housing assembly 1 forming the inner cavity, a contact assembly 2 constrained within the inner cavity, and a button assembly 3 controlling the on / off state of the contact assembly 2. The contact assembly 2 includes a bimetallic strip 2.1 and a movable contact 2.2 disposed opposite to the button assembly 3.

[0043] The bimetallic strip 2.1 comprises at least one protection end 2.21 and a static contact end 2.22 opposite to the movable contact end 2.2, the static contact end 2.22 is connected to the protection end 2.21 and forms a conductive contact on the bimetallic strip 2.1, the movable contact end 2.2 is connected to the button assembly 3, and the static contact end 2.22 is connected to the bimetallic strip 2.1, so that the movable contact end 2.2 is connected to the static contact end 2.22 to form a conductive contact, and the button assembly 3 is pressed to make the movable contact end 2.2 connected to the static contact end 2.22 to form a conductive contact, and the protection end 2.21 is arranged to be bent in an overload state, and the static contact end 2.22 is separated from the movable contact end 2.2 to disconnect the power supply, thereby forming a power-off protection, and in Figure 4 The bimetallic strip 2.1 in the dashed line part is in an overload state.

[0044] It should be noted that the bimetallic strip 2.1 can be composed of two metal sheets with different expansion coefficients, and when the ambient temperature changes, the two metal sheets expand or contract due to temperature changes, causing the bimetallic strip 2.1 to bend and deform; when the temperature rises, the deformation amount of the metal sheet with a large expansion coefficient is greater than that of the metal sheet with a small expansion coefficient, and the metal sheet with a large expansion coefficient can squeeze the metal sheet with a small expansion coefficient to bend synchronously, thereby realizing that when the overload occurs, the bimetallic strip 2.1 of the static contact assembly is heated due to excessive current and bends, and the static contact end 2.22 of the conductive contact end deforms and bends away from the movable contact end 2.2, thereby realizing the protection effect of overload power-off, and the protection end 2.21 away from the static contact end 2.22 of the conductive contact end is opposite to the bending direction of the static contact end 2.22, for example, the static contact end 2.22 bends downward to separate from the movable contact end 2.2 above, and the protection end 2.21 bends upward to be ready to be reset by the force from the pressing.

[0045] Under the overload condition, the static contact end 2.22 part of the conductive contact end bends downward, and the protection end 2.21 on the conductive contact end opposite to it bends upward, so that the protection end 2.21 moves towards the button assembly 3 to be pressed and actuated, so that the conductive contact end is reset to the initial position, and the initial position specifically refers to the position that the movable contact end 2.2 can be contacted with the static contact end 2.22 by the pressing action of the button assembly 3 under the normal state.

[0046] In order to realize the reset of the bimetallic strip 2.1 in the bending protection state, a reset rod 4 is arranged in the shell assembly 1, and a spring 5 is arranged on the reset rod 4, and at least one limiting part 4.1 is arranged on the reset rod 4, and a limiting matching part 6 is arranged in the shell assembly 1, the limiting part 4.1 abuts against the limiting matching part 6, and the reset rod 4 is kept in the initial position, the reset rod 4 is actuated by the button assembly 3 to slide towards the protection end 2.21, and the protection end 2.21 is located in the sliding stroke of the reset rod 4 under the overload state.

[0047] The spring 5 provides an upward force to the reset rod 4 away from the protection end 2.21. The limiting part 4.1 and the limiting mating part 6 abut against each other under the action of the spring 5, thereby stabilizing the initial state of the reset rod 4 and realizing the suspension limit of the reset rod 4 itself, without relying on the button assembly 3 or the bimetallic strip 2.1 to achieve the limit.

[0048] When a reset is required, the reset lever 4 is located in the pressing stroke of the button assembly 3. At this time, the reset lever 4 is driven by the button assembly 3 to move together, thereby pressing against the bent and upturned protection end 2.21, driving the protection end 2.21 to bend downwards and reset, thereby causing the stationary contact end 2.22 on the other end to deform upwards and reset.

[0049] As a further embodiment of the reset rod 4 in its initial position, the limiting part 4.1 is preferably provided at the bottom end of the reset rod 4. The limiting mating part 6 and the limiting part 4.1 are located above the energized state of the protective end 2.21. The spring 5 applies a force that resists the limiting part 4.1 and the limiting mating part 6, and the reset rod 4 is suspended in the housing assembly 1 in its initial position. In this way, the reset rod 4 can be spaced apart from the protective end 2.21 of the bimetallic strip 2.1, and in the overload state, the protective end 2.21 bends toward the reset rod 4, thereby approaching or abutting the bottom of the reset rod 4, thereby avoiding assembly interference and the noise of movement between the reset rod 4 and the bimetallic strip 2.1.

[0050] from Figure 3 As can be seen, in other words, by adjusting the positions of the limiting part 4.1 and the limiting mating part 6, the lower end of the reset rod 4 is spaced apart from the protective end 2.21 in the initial position, and / or the upper end of the reset rod 4 is spaced apart from the button assembly 3; by spacing the top of the reset rod 4 from the button assembly 3, the reset rod 4 can be directly inserted into the housing assembly 1 from the outside during the assembly process, and there will be no interference with the reset rod 4 during the assembly process of the button assembly 3. At the same time, this method further provides tactile feedback to the button assembly 3.

[0051] Specifically, the reset rod 4 includes at least one rod body 4.2, and a limiting portion 4.1 extends radially on one side of the rod body 4.2, such that the limiting portion 4.1 constitutes an outer diameter extension of the rod body 4.2. This portion forms a step shape on the radially outer side of the rod body 4.2. This portion engages with the limiting fitting portion 6 in the actuation direction of the spring 5. At the same time, this configuration of the limiting portion 4.1 allows the reset rod 4 to be inserted into the housing assembly 1 from the outside when the housing assembly 1 is assembled. For this purpose, the housing assembly 1 is provided with a guide hole 1.5 for inserting the rod body 4.2 of the reset rod 4.

[0052] Preferably, the outer contour of the limiting part 4.1 is also provided with an inclined guide surface for setting the insertion direction, so as to facilitate the insertion action of the reset rod 4.

[0053] Furthermore, a notch 4.21 is provided on the rod body 4.2 in a direction opposite to the extension direction of the limiting part 4.1. The notch 4.21 allows the reset rod 4 to swing when inserted into the guide hole 1.5, thereby improving the convenience of assembly.

[0054] The limiting mating part 6 is disposed on the inner side of the housing assembly 1, and the limiting part 4.1 and the limiting mating part 6 are preferably joined by a planar joint.

[0055] like Figure 8 As shown, the rod body 4.2 specifically includes a first segment 4.22 that matches the inner diameter of the guide hole 1.5, and a second segment 4.23 that is eccentric to the first segment 4.22. The notch 4.21 is located within the orthographic projection of the first segment 4.22, and the limiting part 4.1 is located at the bottom end of the second segment 4.23 and extends radially out of the orthographic projection of the first segment 4.22. The inclined guide surface is provided on the bottom contour of the limiting part 4.1.

[0056] Specifically, the reset lever 4 includes two adjacent levers 4.2 and an abutting portion 4.3 connected to the upper ends of the two levers 4.2. The abutting portion 4.3 is provided with a support surface 4.31 that cooperates with the button assembly 3. The support surface 4.31 preferably engages with the button bracket plane on the button assembly 3. The spring 5 abuts between the two levers 4.2. The lower part of the abutting portion 4.3 has a connecting post for the spring 5 to be sleeved. In this way, the force exerted by the spring 5 on the reset lever 4 is centered, which helps to maintain the stability of the reset lever 4 in its initial position and the stability of the reset lever 4 when sliding relative to the housing assembly 1, reduces the horizontal sway of the reset lever 4 in the sliding stroke, and ensures smooth operation.

[0057] Specifically, the radial extension directions of the limiting parts 4.1 on the two rods 4.2 are opposite to each other, in order to further ensure the stability of the reset rod 4 when it abuts against the limiting mating part 6.

[0058] As one arrangement of the limiting fitting part 6, the limiting part 4.1 is inserted into the housing assembly 1 along with the reset rod 4. The housing assembly 1 includes an upper shell 1.1 and a base 1.2 that are assembled relative to each other. The limiting fitting part 6 is disposed on the inner side of the upper shell 1.1. This inner side is preferably the bottom interface of the guide hole 1.5, so that after the reset rod 4 passes through the guide hole 1.5, it can quickly reach the limiting position under the action of the spring 5.

[0059] As another arrangement of the limiting and mating part 6, the contact assembly 2 also includes a first stationary contact 2.3 that overlaps with the bimetallic strip 2.1. The limiting part 4.1 is placed in the housing assembly 1 along with the reset rod 4. The housing assembly 1 is provided with a support seat 1.3 for supporting the first stationary contact 2.3. The limiting and mating part 6 is disposed on the support seat 1.3.

[0060] The bearing seat 1.3 is limited between the upper shell 1.1 and the base 1.2, and the upper shell 1.1 and the base 1.2 abut against the first static contact 2.3 at the same time, and keep the stability of the first static contact 2.3. The bearing seat 1.3 is preferably arranged between the ratchet structure 9 of the button assembly 3 and the horizontal position of the reset rod 4, and the bearing seat 1.3 supports the first static contact 2.3 above the protection end 2.21 of the bimetallic strip 2.1, so as to fully utilize the space utilization rate of the side where the reset rod 4 is located in the button switch.

[0061] As shown in Figure 1 and Figure 6 , the shell assembly 1 is provided with a guide seat 1.4 extending in the sliding direction of the reset rod 4, the spring 5 and / or the reset rod 4 are arranged in the guide seat 1.4, the guide seat 1.4 is formed with a guide hole 1.5 penetrating through the upper shell 1.1 of the shell assembly 1, and used for arranging the rod body 4.2 of the reset rod 4, and a groove 1.6 for arranging the lower end of the spring 5 is arranged on one side of the guide hole 1.5, so as to ensure the stability of the force of the spring 5. The guide seat 1.4 is further extended in the axial direction, so as to further improve the matching area of the reset rod 4, and further ensure the stability of the reset rod 4 in the sliding action. The rod body 4.2 and the first section 4.22 thereof on the reset rod 4 effectively reduce the horizontal movement in the sliding, so as to ensure the smoothness of the sliding.

[0062] As shown in Figure 6 , the above-mentioned groove 1.6 is preferably arranged in the guide seat 1.4 extending in the axial direction, so as to further maintain the force stability of the spring 5.

[0063] As shown in Figure 7 and Figure 9 and Figure 10 , as a further embodiment of the arrangement of the contact assembly 2 in the shell assembly 1, the contact assembly 2 further comprises a second static contact 2.4 abuttingly connected with the bimetallic strip 2.1. The base 1.2 is provided with a limiting support 7, the limiting support 7 is formed with a first limiting channel 7.1 on one side of the base 1.2, and a second limiting channel 7.2 on the other side of the base 1.2. The first limiting channel 7.1 and the second limiting channel 7.2 are preferably vertically stacked, or there is an overlapping part in the orthographic projection direction, but at least the first limiting channel 7.1 and the second limiting channel 7.2 are not communicated. In order to distinguish the first limiting channel 7.1 and the second limiting channel 7.2, the first limiting channel 7.1 is defined below the second limiting channel 7.2. The second static contact 2.4 is arranged in the first limiting channel 7.1 for limiting, and the fixed part of the movable contact 2.2 is arranged in the second limiting channel 7.2 for limiting, and the movable part of the movable contact 2.2 is bent out of the limiting support 7.

[0064] As preferred, the limiting support 7 forms a third limiting passage 7.3 at the inner side opening of the base 1.2, the opening direction of the third limiting passage 7.3 is perpendicular to the first limiting passage 7.1 and the second limiting passage 7.2, the fixed part of the bimetallic strip 2.1 is arranged in the third limiting passage 7.3 away from the protection end 2.21, and the fixed part is engaged with the second static contact 2.4, wherein the third limiting passage 7.3 is communicated with the first limiting passage 7.1, thereby limiting the fixed part of the bimetallic strip 2.1, in this way, the space utilization of the shell assembly 1 away from the side where the reset rod 4 is arranged is fully utilized, the button switch is more compact, the contact assembly 2 is pre-positioned on the base 1.2 and the bearing seat 1.3, and the assembly is more convenient.

[0065] Further referring to Figure 4 and Figure 7 In other embodiments, a limiting block 7.4 spaced above the bimetallic strip 2.1 is further arranged on the third limiting passage 7.3, which aims to reliably limit the fixed part of the bimetallic strip 2.1 and prevent the fixed part of the bimetallic strip 2.1 from being warped.

[0066] As shown in Figure 4 , as a further improvement of the button switch, the button assembly 3 is provided with a lamp plate assembly 8, the button assembly 3 further includes a lamp cap, and the lamp plate assembly 8 can be arranged between the lamp cap and the bottom plate. The lamp plate assembly 8 is energized with the contact of the moving contact 2.2 and the static contact end 2.22, and is de-energized with the separation of the moving contact 2.2 and the static contact end 2.22, so that the lamp plate assembly 8 can prompt the on-off of the power supply, and the button switch with lamp has been widely used in the prior art, which will not be described in detail here.

[0067] The lamp plate assembly 8 is connected with two conductive springs 8.1, one of which abuts against the moving contact 2.2, and the other abuts against the first static contact 2.3.

[0068] As shown in Figure 4 and Figure 5 In the above embodiments, the button assembly 3 is specifically selected as a ratchet structure 9, the shell assembly 1 is provided with a ratchet sleeve corresponding to the ratchet structure 9, the ratchet structure 9 includes a first ratchet 9.1 at the upper part and a second ratchet 9.2 at the lower part, the first ratchet 9.1 is sleeved outside the second ratchet 9.2, a reset spring 9.3 is arranged inside the second ratchet 9.2, the structure of the first ratchet 9.1 and the second ratchet 9.2 has been widely used in the prior art, which will not be described in detail here, the upper end of the reset spring 9.3 abuts against the second ratchet 9.2, the lower end of the reset spring 9.3 abuts against the moving contact 2.2, and the upper end of the first ratchet 9.1 abuts against the button assembly 3.

[0069] Thus, the ratchet structure 9 drives the button assembly 3 to the initial position by the reset spring 9.3.

[0070] When the button assembly 3 is pressed from the initial position, the first ratchet 9.1 and the second ratchet 9.2 are lowered, and the reset spring 9.3 is pressed by the second ratchet 9.2 to act on the movable contact 2.2, thereby making the movable contact 2.2 lower and contact the static contact end 2.22, at this time, the first ratchet 9.1 and the second ratchet 9.2 are locked in the ratchet sleeve, thereby maintaining the pressure on the movable contact 2.2 and maintaining the energized state;

[0071] The reset action is performed on the button assembly 3, so that the first ratchet 9.1 and the second ratchet 9.2 are lowered again, and the second ratchet 9.2 is unlocked under the guidance of the ratchet sleeve, and then the first ratchet 9.1 and the second ratchet 9.2 are lifted up by the reset spring 9.3, at this time, the movable contact 2.2 loses the pressure and is reset upward, thereby being separated from the contact of the static contact end 2.22.

[0072] The specific embodiment is only an explanation of the present application, and is not a limitation of the present application. Those skilled in the art can make modifications to the embodiment without creative contribution after reading the specification, but as long as it is within the scope of the claims of the present application, it is protected by the patent law.

Claims

1. A push button switch having an overload reset function, characterized by comprising: The utility model relates to a kind of safety switch, including: Including the shell assembly (1) of constituting inner cavity, the contact piece assembly (2) being constrained in inner cavity, and the button assembly (3) of controlling the on-off of contact piece assembly (2), the contact piece assembly (2) includes bimetallic strip (2.1), and movable contact (2.2) is oppositely arranged with button assembly (3), the bimetallic strip (2.1) at least includes one protective end (2.21), and static contact end (2.22) is oppositely arranged with movable contact (2.2), the static contact end (2.22) is connected with protective end (2.21), the protective end (2.21) is arranged to bend under overload state, and movable contact (2.2) is separated with static contact end (2.22) by driving; It further includes reset rod (4) that is threaded in shell assembly (1), and spring (5) is supported on reset rod (4), the reset rod (4) is actuated to slide by button assembly (3), the protective end (2.21) is located in the sliding travel of reset rod (4) under overload state, and at least one limit portion (4.1) is provided on the reset rod (4), limit cooperation portion (6) is provided in the shell assembly (1), the limit portion (4.1) is abutted with limit cooperation portion (6), and reset rod (4) is kept in initial position.

2. The push button switch with overload reset function according to claim 1, characterized in that: The cooperation position of the limit cooperation portion (6) and the limit portion (4.1) is located above the power-on state of the protective end (2.21), the spring (5) exerts the force of the limit portion (4.1) and the limit cooperation portion (6) abut, and the reset rod (4) is suspended in the shell assembly (1) in the initial position.

3. The push button switch with overload reset function according to claim 1, characterized in that: The reset rod (4) is spaced apart from the protective end (2.21) at the lower end of the reset rod (4) in the initial position, and / or the reset rod (4) is spaced apart from the button assembly (3) at the upper end of the reset rod (4).

4. The push button switch with overload reset function according to claim 1, characterized in that: The reset rod (4) includes at least one rod body (4.2), and the limit portion (4.1) extends radially on one side of the rod body (4.2).

5. The push button switch with overload reset function according to claim 1, characterized in that: The reset rod (4) includes two adjacent rod bodies (4.2), and an abutting portion (4.3) is connected to the upper ends of the two rod bodies (4.2), the abutting portion (4.3) is provided with a supporting surface (4.31) that cooperates with the button assembly (3), and the spring (5) abuts between the two rod bodies (4.2).

6. A push switch with an overload reset function according to claim 4 or 5, characterized in that: The rod body (4.2) is provided with a notch portion (4.21) extending away from the limit portion (4.1).

7. The push button switch with overload reset function according to claim 5, characterized in that: The radial extension directions of the limit portions (4.1) on the two rod bodies (4.2) are arranged away from each other.

8. The push button switch with overload reset function according to claim 1, characterized in that: The limit portion (4.1) is placed in the shell assembly (1) with the reset rod (4), and the shell assembly (1) includes an upper shell (1.1) and a base (1.2) that are relatively split, and the limit cooperation portion (6) is arranged on the inner side of the upper shell (1.1).

9. The push button switch with overload reset function according to claim 1, characterized in that: The contact assembly (2) further comprises a first static contact (2.3) which is overlapped with the bimetallic strip (2.1), the limiting part (4.1) is placed in the shell assembly (1) with the reset rod (4), the shell assembly (1) is provided with a bearing seat (1.3) for bearing the first static contact (2.3), and the limiting matching part (6) is arranged on the bearing seat (1.3).

10. The push button switch with overload reset function according to claim 1, characterized in that: The shell assembly (1) is provided with a guide seat (1.4), the guide seat (1.4) extends in the sliding direction of the reset rod (4), and the spring (5) and / or the reset rod (4) are arranged in the guide seat (1.4).

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