Overload protection switch

Abstract

The utility model discloses an overload protection switch, and belongs to the technical field of switches. The overload protection switch comprises: a housing; the ratchet wheel key assembly is arranged on the shell; one end of the elastic contact piece is installed on the shell, the other end of the elastic contact piece 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; and the reset linkage piece is rotatably arranged on the shell, the reset linkage piece is provided with a connecting arm and a reset arm, the connecting arm is used for connecting the contact part, and the reset arm is used for connecting the second end of the bimetallic strip. The overload protection switch provided by the utility model has reliable overload protection performance and stable and reliable overload protection switch functions.

Description

Technical Field

[0001] This application belongs to the technical field of switches, and particularly relates to an overload protection switch. Background Art

[0002] A push-button switch is a convenient switch in the form of pressing for opening and closing. It realizes conduction or cut-off 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 with the static contact piece or disconnect from the static contact piece; one end of the ratchet assembly abuts against the moving contact piece to drive the moving contact piece to deform and move, and can use the self-locking function of the ratchet assembly 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] In the actual use process, the function of the push-button switch is single, and it can only realize the switching of the mechanical on-off state, without the overload protection function, having certain safety risks and unreliable switch functions. Summary of the Invention

[0004] This application provides an overload protection switch, aiming to at least solve to a certain extent the technical problems of high overload safety risk and unreliable switch function of the push-button switch. To this end,

[0005] An embodiment of this application provides an overload protection switch, including:

[0006] A housing;

[0007] A ratchet button assembly arranged in the housing;

[0008] An elastic contact piece, one end of which is installed on the housing, and the other end is provided with a contact part. The contact part abuts against the ratchet button assembly, so that the contact part moves under the drive of the ratchet button assembly;

[0009] A bimetallic strip, the first end of which is installed on the housing. The second end of the bimetallic strip is provided with a static contact point that can be detachably connected to the contact part. When the bimetallic strip is overloaded and deformed, the second end of the bimetallic strip is displaced to drive the static contact point away from the contact part;

[0010] The reset linkage is rotatably arranged on the housing. The reset linkage has a connecting arm and a reset arm. The connecting arm is used to connect the contact part, and the reset arm is used to connect the second end of the bimetal sheet. And in the state where the second end of the bimetal sheet is deformed and displaced, when the contact part moves under an external force, the connecting arm drives the linkage reset part to rotate, thereby driving the reset arm to move the second end of the bimetal sheet in a direction opposite to the deformation displacement direction of the second end of the bimetal sheet, so that the static contact moves towards the direction close to the contact part.

[0011] In some embodiments, the reset linkage includes a rotating shaft, and the rotating shaft is rotatably connected to the housing. The connecting arm and the reset arm are respectively arranged on the rotating shaft.

[0012] In some embodiments, the connecting arm and the reset arm are arranged on the circumferential side surface of the rotating shaft.

[0013] In some embodiments, the rotating shaft and the elastic contact piece are located on the same side of the plate surface of the bimetal sheet, and the rotating shaft straddles the bimetal sheet in the orthogonal direction of the connection line between the first end and the second end of the bimetal sheet.

[0014] In some embodiments, a through hole is formed in the middle of the bimetal sheet, an extension arm extending into the through hole is arranged at the second end of the bimetal sheet, and the static contact is arranged at the end of the extension arm;

[0015] In the direction of the connection line between the first end and the second end of the bimetal sheet, the connecting arm and the reset arm are located on both sides of the rotating shaft.

[0016] In some embodiments, both ends of the rotating shaft are rotatably connected to the housing.

[0017] In some embodiments, a hook part is arranged on the connecting arm, and the hook part is lapped on the contact part.

[0018] In some embodiments, a hanging arm is arranged on the contact part, and the hanging arm is cooperatively lapped with the hook part.

[0019] In some embodiments, the elastic contact piece and the reset linkage are arranged at intervals along the length direction of the bimetal sheet, wherein the length direction of the bimetal sheet is the connection line direction between the first end and the second end of the bimetal sheet.

[0020] In some embodiments, the elastic contact piece is arranged on one side in the width direction of the bimetal sheet, wherein the width direction of the bimetal sheet is the orthogonal direction of the connection line between the first end and the second end of the bimetal sheet.

[0021] The embodiments of the present application have at least the following beneficial effects:

[0022] The overload protection switch provided by the embodiments of the present application includes a housing, and a ratchet button assembly, an elastic contact piece, a bimetallic strip, and a reset linkage member disposed in the housing. The first end of the elastic contact piece is installed in the housing, and the contact portion at the second end of the elastic contact piece 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 bimetallic strip is installed in the housing, and a static contact is provided at the second end of the bimetallic strip. Cooperating with the contact portion, it conducts or disconnects the circuit to achieve the function of a push-button switch. 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 achieving overload power-off protection. At the same time, the reset linkage member is rotatably disposed on the housing, and a connecting arm and a reset arm are provided on the reset linkage member. 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 the position of the reset arm is configured on the moving track of the second end of the bimetallic strip. Thus, when the bimetallic strip deforms under overload, its second end deforms and shifts and approaches or even abuts against the reset arm. When resetting the bimetallic strip, the contact portion can be displaced by pressing the ratchet button assembly. When the connecting arm moves following the contact portion, the reset linkage member and the reset arm rotate synchronously to move the second end of the bimetallic strip, so that the static contact resets to the switch working position before overload, and the switch function of the overload protection switch is restored. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for description in 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.

[0024] Figure 1 shows an exploded structural schematic diagram of the overload protection switch in the embodiments of the present application;

[0025] [[ID=

[15] Figure 2 shows Figure 1 the assembled state schematic diagram of the overload protection switch in

[0026] Figure 3 shows Figure 1 the structural schematic diagram of the internal functional mechanism of the overload protection switch in

[0027] Figure 4 shows Figure 1Schematic diagram of the assembled state of the elastic contact piece, bimetallic piece and reset linkage of the overload protection switch in

[0028] Figure 5 shows Figure 3 Schematic diagram of the off-state structure of the overload protection switch in

[0029] Figure 6 shows Figure 3 Schematic diagram of the on-state structure of the overload protection switch in

[0030] Figure 7 shows Figure 3 Schematic diagram of the overload-state structure of the overload protection switch in

[0031] Figure 8 shows Figure 1 Another schematic diagram of the assembled state of the elastic contact piece, bimetallic piece and reset linkage of the overload protection switch in Detailed implementation manners

[0032] 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. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0033] In addition, the present application may repeat reference numerals and / or reference letters in different examples. Such 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 may be aware of the application of other processes and / or the use of other materials.

[0034] Next, the present application will be described in conjunction with the accompanying drawings and with reference to specific embodiments:

[0035] In the key switch based on the ratchet key assembly, an elastically movable contact piece and a static contact piece that can be detachably connected are configured. The elastically movable contact piece is connected to the ratchet key assembly. By pressing the ratchet key assembly, the elastically movable contact piece can be driven to approach and connect or disconnect and move away from the static contact piece to realize the switch function, and the self-locking function of the ratchet key assembly is used to maintain the connected and disconnected states. However, with the diversification of electrical appliance types, the situation of overloading of electricity consumption is likely to occur. Therefore, it is necessary to configure an overload protection function for the key switch to improve the safety of electricity consumption and the reliability of the switch function.

[0036] To this end, the embodiments of the present application provide an overload protection switch, aiming to increase the overload protection function and reset function through structural design, and improve the use safety and functional reliability of the push-button switch to a certain extent.

[0037] Figure 1 FIG. shows an exploded structural schematic diagram of the overload protection switch in the embodiments of the present application; Figure 2 FIG. shows Figure 1 the schematic diagram of the assembled state of the overload protection switch in Figure 3 FIG. shows Figure 1 the structural schematic diagram of the internal functional mechanism of the overload protection switch in Figure 4 FIG. shows Figure the schematic diagram of the assembled state of the elastic contact piece, bimetallic piece and reset linkage in the overload protection switch in ​ FIG. shows ​ the structural schematic diagram of the off state of the overload protection switch in ​ FIG. shows ​ the structural schematic diagram of the on state of the overload protection switch in ​ FIG. shows ​ the structural schematic diagram of the overload state of the overload protection switch in

[0038] Referring to ​ , ​ , ​ ​ , ​ , ​ and ​ , in some embodiments, the overload protection switch may be configured with a bimetallic piece having an overload deformation function as an overload sensitive element to track the overload state, and achieve the open circuit protection function through the overload deformation and displacement, and a reset structure is configured to realize the attitude and position reset of the bimetallic piece after power-off, so as to ensure the stability and reliability of the switch function.

[0039] The overload protection switch may include a housing 1 and a ratchet button assembly 2, an elastic contact piece 3, a bimetallic piece 4 and a reset linkage 5 arranged on the housing 1; the elastic contact piece 3 is detachably connected to the bimetallic piece 4, and the ratchet button assembly 2 is connected to the elastic contact piece 3, and by pressing the ratchet button assembly 2, the free end of the elastic contact piece 3 is driven to approach or move away from the connection with the bimetallic piece 4 to realize the on-off function of the switch; and when overloaded, the connection between the bimetallic piece 4 and the elastic contact piece 3 can be disconnected by using the deformation and displacement of the bimetallic piece 4 to realize the overload open circuit protection.

[0040] ​The reset linkage 5 is connected to the free end of the elastic contact piece 3 and is arranged in a matching manner with the position of the bimetal piece 4. After the bimetal piece 4 is deformed and displaced due to overload, by pressing the ratchet button assembly 2, the free end of the elastic contact piece 3 can be displaced, driving the reset linkage 5 to act, forcing the bimetal piece 4 to reset to the position and posture before overload, ensuring the reliability of the switch function.

[0041] Specifically, the housing 1 is the bearing foundation of the entire overload protection switch, used to accommodate or install other functional components such as the ratchet button assembly 2, the elastic contact piece 3, the bimetal piece 4, and the reset linkage 5. The housing 1 can also be used as the installation foundation of the overload protection switch and is configured to be installed on other product structures. For example, the housing 1 can be installed on various electrical equipment such as a power strip.

[0042] The ratchet button assembly 2 is arranged in the housing 1 and can extend or shorten 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 of the elastic contact piece 3 and the bimetal 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 two ends of the ratchet spring 23 are elastically abutted against the lower ratchet 22 and the elastic contact piece 3. 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, thereby realizing the switching between the upper and lower two positions and realizing the function of the switch button.

[0043] 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 bimetal piece 4 to realize electrical connection. The contact portion 32a can also be abutted 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.

[0044] The bimetallic strip 4 is an electrical connection element. The first end 41 of the bimetallic strip 4 is installed in the housing 1. The second end 42 of the bimetallic strip 4 is provided with a static contact 42a, and the static contact 42a can be electrically connected or disconnected from the elastic contact piece 3. Among them, the bimetallic strip 4 has an overload deformation function and, as an overload-sensitive element, can track the power consumption situation. When the bimetallic strip 4 is overloaded, it will generate a large amount of heat, causing the bimetallic strip 4 to deform in a set direction, and the deformation will accumulate at the second end 42 of the bimetallic strip 4, resulting in a large deformation and displacement of the second end 42 of the bimetallic strip 4. The static contact 42a will also be greatly displaced, thereby disconnecting the connection with the contact portion 32a, thus realizing the overload protection open-circuit function.

[0045] The reset linkage 5 is an element for driving the overloaded and deformed bimetallic strip 4 to reset. It can be set as a linkage based on the cylinder rod principle and is connected between the free end 32 of the elastic contact piece 3 and the second end 42 of the bimetallic strip 4. After overload, it will follow the movement of the elastic contact piece 3 to drive the second end 42 of the bimetallic strip 4 to deform and reset. The reset linkage 5 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 used to connect the connecting portion 32a, and the reset arm 52 is used to connect the second end 42 of the bimetallic strip 4. Thus, when the bimetallic strip 4 is overloaded and deformed, the second end 42 of the bimetallic strip 42 will move towards the reset arm 52 or move together with the reset arm 52.

[0046] It should be noted that the bimetallic strip 4 has a conventional position and attitude, that is, a preset switch working position, to ensure that the static contact 42a on the bimetallic strip 4 can cooperate with the contact portion 32a of the elastic contact piece 3 to maintain a stable electrical connection state or disconnection state, thereby realizing a stable and reliable switch function. However, when an overload condition occurs in the state where the contact portion 32a is electrically connected to the static contact 42a, the bimetallic strip 4 will undergo high-temperature deformation, causing the static contact 42a to move away from the contact portion 32a at the current position and leave the preset switch working position to disconnect the circuit and realize the overload open-circuit protection function.

[0047] When reset is required, after the bimetal 4 is deformed due to overload for multiple fingers, in order to restore the switching function of the overload protection switch, that is, the static contact 42a is reset to the preset switching working position; the free end 32 of the elastic contact piece 3 can be driven to move by pressing the ratchet button assembly 2, and at the same time, the connecting arm 51 is driven to move, so as to drive the reset linkage 5 to rotate, so as to drive the reset arm 52 to move the second end 42 of the bimetal 4, so that the second end 42 of the bimetal 4 can move in the direction opposite to the overload deformation direction of the second end 42 of the bimetal 42, and finally be reset to the position and posture before the overload deformation, so as to restore the cooperative switching function between the bimetal 4 and the elastic contact piece 3 and improve the reliability of the switching function.

[0048] On the other hand, when pressing the ratchet button assembly 2 to reset the bimetal 4, the position of the contact portion 32a of the elastic contact piece 3 is also switched, that is, it is moved away from the conduction working position and returned to the open circuit working position, so as to avoid risks such as electric shock or re-overload of the instantaneously conducting circuit after the bimetal 4 is reset, and ensure the electrical safety after reset. At the same time, through structural design, integrating the pressing switch to switch the switch state and the reset operation into one pressing operation also simplifies the reset operation to a certain extent and improves the operation convenience.

[0049] The overload protection switch provided by the embodiment of the present application includes a housing and a ratchet button assembly, an elastic contact piece, a bimetal and a reset linkage arranged in the housing. The first end of the elastic contact piece is installed in the housing, and the contact portion of the second end of the elastic contact piece abuts against one end of the ratchet button assembly and can be deformed and moved 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, which cooperates with the contact portion to conduct or disconnect the circuit to realize the overload protection switch function; by utilizing the characteristic of the bimetal deforming due to overload, the static contact located at the second end of the bimetal can move following the deformation of the second end of the bimetal, so as 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, a connecting arm and a reset arm are arranged on the reset linkage, and the connecting arm is used to connect the contact portion, the reset arm is used to connect the second end of the bimetal, and the position of the reset arm is configured on the moving track of the second end of the bimetal, so that when the bimetal is deformed due to overload, its second end is deformed and displaced and approaches and even abuts against the reset arm; when resetting the bimetal, the contact portion can be displaced by pressing the ratchet button assembly. When the connecting arm moves following the contact portion, the reset linkage and the reset arm rotate synchronously to move the second end of the bimetal, so that the static contact is reset to the switching working position before overload and the switching function of the overload protection switch is restored.

[0050] In some embodiments, a through hole 43 penetrating the bimetal sheet 4 is formed in the bimetal sheet 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 sheet 4, and the static contact 42a can be arranged at the free end of the extension arm 44, that is, the end portion located in the through hole 43, so that when the bimetal sheet 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 sheet 4.

[0051] That is to say, when the bimetal sheet 4 is deformed due to overload, the static contact 42a moves away from the contact portion 32a along with the extension arm 44, and the second end 42 of the bimetal sheet 4 moves closer to the contact portion 32a, so as to realize the function of power-off under overload.

[0052] Correspondingly, by pressing the ratchet button assembly 2, the free end 32 of the elastic contact piece 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 sheet 4 to move and finally reset, so that the static contact 42a moves closer to the contact portion 32a along with the extension arm 44 and finally resets to the preset switch working position.

[0053] 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 overload protection switch; for overload reset, it is usually necessary to press the ratchet button assembly 2 to move the free end 32 of the elastic contact piece 3 and the ratchet button assembly 2 to the off working position of the overload protection switch, that is, the position where the free end 32 of the elastic contact piece 3 is far away from the static contact 42a of the bimetal sheet 4, that is, the pressing stroke for closing the overload protection switch in the general understanding.

[0054] Through the position cooperation of the reset linkage 5 with the elastic moving contact piece 3 and the bimetal sheet 4, integrating the reset operation of the bimetal sheet 4 into the open circuit operation of the ratchet button assembly 2 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 to prompt the contact portion 32a to leave the matching position with the static contact piece 42a is a necessary safety operation; by integrating the reset operation of the bimetal sheet into the open circuit operation of the ratchet button assembly 2, the operation can be simplified and the operation convenience can be improved.

[0055] In some embodiments, in order to enable the reset linkage 5 to synchronously deflect and drive the second end 42 of the bimetal 4 to move and reset during the process that the contact portion 32a of the elastic contact piece 3 moves away from the stationary contact point 42a of the bimetal 4, the reset linkage 5 can be arranged as a lever principle mechanism. The contact portion 32a moves the connecting arm, thereby driving the reset linkage 5 to deflect, so that the reset arm 52 moves the second end 42 of the bimetal 4.

[0056] Specifically, the reset linkage 5 may include a rotating shaft 53 which is rotatably connected to the housing 1 and serves 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, thereby forming a reset linkage mechanism similar to a lever.

[0057] That is, when the connecting arm 51 is driven by the contact portion 32a, it will rotate about the rotating shaft 53 and drive the rotating shaft 5 to rotate. Correspondingly, the reset arm 52 will also rotate about the rotating shaft 53 under the drive of the rotating shaft 53, so as to be able to move the second end 42 of the bimetal 4 and make the stationary contact point 42a move and reset.

[0058] In some embodiments, in order to reduce the structural complexity of the reset linkage 5, the connecting arm 51 and the reset arm 52 can be arranged 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 approximately 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.

[0059] In some embodiments, in order to reduce the installation space requirement, the rotating shaft 53 and the contact portion 32a of the elastic contact piece 3 can be arranged on the same side of the plate surface of the bimetal 4.

[0060] Generally, the rotating shaft 53 can be arranged across one side of the bimetal 4 along the width direction of the bimetal 4. The width direction of the bimetal 4 is the orthogonal direction of the line connecting the first end 41 and the second end 42 of the bimetal 4, and the length direction of the bimetal 4 is the line connecting the first end 41 and the second end 42 of the bimetal 4.

[0061] Correspondingly, in the length direction of the bimetal 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 both be in the length direction of the bimetal 4, thereby being able to limit the overall length of the overload protection switch to a certain extent.

[0062] 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 can be arranged in the middle region of the rotating shaft 53.

[0063] Generally speaking, in order to simplify the structure, the rotating shaft 53 can be set as a rod, and both ends of the rotating shaft 53 are set as cylindrical shapes to achieve smooth rotation.

[0064] 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 can be lapped on the contact portion 32a. During the process of the contact portion 32a moving away from the stationary contact 42a of the bimetal 4, the contact portion 32a drives the connecting arm 51 to move away from the bimetal 4.

[0065] On the other hand, during the process of the contact portion 32a approaching the bimetal 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.

[0066] 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 4 is deformed and bent, and a certain distance is maintained. Thus, when the bimetal 4 is overloaded and deformed, the second end 42 of the bimetal 4 will move towards the reset arm 52, and even abut and push the reset arm 52 to move. Therefore, when the free end 32 of the elastic contact piece 3 moves away from the bimetal 4, the reset linkage 5 can be pushed to act relatively quickly to achieve efficient and stable reset.

[0067] 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.

[0068] Generally speaking, the hook portion 51a can be lapped on the side of the contact portion 32a away from the bimetal 4. Thus, during the process of the contact portion 32a moving away from the bimetal 4, that is, during the stroke of turning off the overload protection switch, the hook portion 51a can stably lap on the contact portion 32a and move away from the bimetal 4 following the contact portion 32a.

[0069] In other embodiments, the connecting arm 51 can also be directly connected to the contact portion 32a, and various connection methods such as clamping and bonding can be adopted.

[0070] In some embodiments, in order to facilitate the connection of the hooking portion 51a, a hanging arm 32b may be provided on one side of the contact portion 32a, so as to adapt to hook the hooking portion 51a.

[0071] In some embodiments, the reset arm 52 and the second end 42 of the bimetal sheet 4 may be connected in a non-fixed manner, such as in a relatively open form such as lapping or abutting, or with a certain gap maintained.

[0072] 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 back to its original position.

[0073] In some embodiments, the reset arm 52 may be configured 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.

[0074] In some embodiments, the bimetal sheet 4 may also be of other forms, but their basic principles are the same. In an overloaded state, the bimetal sheet 4 will deform and shift in a set direction. According to the direction of deformation and shift of the second end of the bimetal sheet 4, the reset linkage 5 may be configured 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 the second end 42 of the bimetal sheet 4 back to its original position.

[0075] For example, the bimetal sheet 4 may be configured as an integral sheet member, with one end fixed in the housing 1 and the other end being a free end. The stationary contact 42a is fixed on the free end of the bimetal sheet 4 and can move following the free end of the bimetal sheet 4, approaching or departing from the contact portion 32a. At this time, the moving direction of the stationary contact 42a is the same as that of the free end of the bimetal sheet 4.

[0076] When the bimetal sheet 4 is overloaded, the second end of the bimetal sheet 4 and the stationary contact 42a move away from the contact portion 32a, and the reset arm 52 can be linked to pull the second end of the bimetal sheet 4 closer to the contact portion 32a.

[0077] Generally, the reset arm 52 may be provided on the side of the bimetal sheet 4 away from the contact portion 32a, and in the length direction of the bimetal sheet 4, the reset arm 52 and the connecting arm 51 are on the same side of the rotating shaft 53. Thus, when the connecting arm 51 moves away from the bimetal sheet 4 following the contact portion 32a, the reset arm 52 pushes the second end 42 of the bimetal sheet 4 to move back in the direction of the contact portion 32a, ultimately driving the stationary contact 42a to reset.

[0078] In some embodiments, the elastic contact piece 3 and the reset linkage 5 may be arranged at intervals along the length direction of the bimetal piece 4. For example, the fixed end 31 of the elastic contact piece 3 may be fixed to one side of the first end 41 of the bimetal piece 4, and the free end 32 of the elastic contact piece 3 may be suspended in the middle of the bimetal piece 4. The reset linkage 5 is located on one side of the second end 42 of the bimetal piece 4.

[0079] ​ shows ​ Another schematic diagram of the assembly state of the elastic contact piece, the bimetal piece and the reset linkage of the overload protection switch in

[0080] See ​ , in some embodiments, in order to reduce the length of the overload protection switch, the elastic contact piece 3 may be arranged on one side in the width direction of the bimetal piece 4, that is, the fixed end 31 of the elastic contact piece 3 is arranged on the side in the orthogonal direction of the connection line between the first end 41 and the second end 42 of the bimetal piece 4, and the free end 32 may extend to the middle of the bimetal piece 4 and be arranged opposite to and matched with the static contact point 42a.

[0081] In some embodiments, in order to facilitate connecting to other structures, a conductive contact piece 45 may be connected to the first end 41 of the bimetal piece 4.

[0082] In some embodiments, the housing 1 may be provided as a snap - together base 11 and an upper cover 12 for easy installation.

[0083] In this application, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "under" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0084] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present 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 on the present application.

[0085] It should be noted that all directional indications in the embodiments of the present application are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If this specific posture changes, the directional indication will also change accordingly.

[0086] In the present application, unless otherwise clearly defined and 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 it 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 the present application can be understood according to specific circumstances.

[0087] In addition, in the present application, descriptions such as "first" and "second" are only for descriptive purposes and should not be construed 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 described features. In the description of the present application, "a plurality" means two or more, unless otherwise clearly and specifically defined.

[0088] In the description of this specification, the descriptions with reference to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" 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 the present application. In this specification, the schematic descriptions 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.

[0089] 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 is contradictory 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.

[0090] Although the embodiments of the present 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 the present application. The scope of the present application is defined by the claims and their equivalents.

Claims

1. An overload protection switch, characterized in that, Comprising: A housing; A ratchet button assembly disposed in the housing; A resilient contact piece, one end of which is mounted on the housing and the other end of which is provided with a contact portion that abuts against the ratchet button assembly such that 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 displaced to drive the stationary contact away from the contact portion; A reset linkage member rotatably disposed in 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.

2. The overload protection switch according to claim 1, characterized in that, The reset linkage member includes a rotating shaft, and the rotating shaft is rotatably connected to the housing, and the connecting arm and the reset arm are respectively disposed on the rotating shaft.

3. The overload protection switch according to claim 2, characterized in that, The connecting arm and the reset arm are disposed on the circumferential side surface of the rotating shaft.

4. The overload protection switch according to claim 3, characterized in that, The rotating shaft and the resilient contact piece are located on the same side of the plate surface of the bimetallic strip, and the rotating shaft straddles the bimetallic strip in a direction orthogonal to the connection line between the first end and the second end of the bimetallic strip.

5. The overload protection switch according to claim 4, wherein, A through hole is formed in the middle of the bimetallic strip, and an extension arm extending into the through hole is provided at the second end of the bimetallic strip, and the stationary contact is disposed at the end of the extension arm; In the direction of the connection line between the first end and the second end of the bimetallic strip, the connecting arm and the reset arm are located on both sides of the rotating shaft.

6. The overload protection switch according to claim 2, characterized in that, Both ends of the rotating shaft are rotatably connected to the housing.

7. The overload protection switch according to claim 1, characterized in that, A hook portion is provided on the connecting arm, and the hook portion is lapped on the contact portion.

8. The overload protection switch according to claim 7, characterized in that, A hanging arm is provided on the contact portion, and the hanging arm cooperates with the hook portion for lapping.

9. The overload protection switch according to any one of claims 1 to 8, characterized in that, The resilient contact piece and the reset linkage member are arranged at intervals along the length direction of the bimetallic strip, wherein the length direction of the bimetallic strip is the direction of the connection line between the first end and the second end of the bimetallic strip.

10. The overload protection switch according to any one of claims 1 to 8, characterized in that, The resilient contact piece is disposed on one side in the width direction of the bimetallic strip, wherein the width direction of the bimetallic strip is the direction orthogonal to the connection line between the first end and the second end of the bimetallic strip.

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