Overload protection indication type key switch

Abstract

The utility model discloses an overload protection indication type key switch which comprises a shell, a ratchet wheel key assembly, a bimetallic strip and an elastic contact piece, the ratchet wheel key assembly, the bimetallic strip and the elastic contact piece are arranged in the shell, the first end of the bimetallic strip is fixed in the shell, the second end of the bimetallic strip is provided with a static contact, and the free end of the elastic contact piece is provided with a contact part detachably connected with the static contact. The ratchet wheel button assembly abuts against the contact part, and under the action of external force, the ratchet wheel button assembly pushes the contact part to move so as to connect or disconnect the contact part and the static contact. The overload protection indication type key switch further comprises a reset linkage piece which is rotationally arranged on the shell, the reset linkage piece is provided with a connecting arm and a reset arm, the connecting arm is used for being connected with the contact part, and the reset arm is used for being connected with the second end of the bimetallic strip; the indicating piece is movably arranged on the shell, and the indicating piece is in lap joint with the second end of the bimetallic strip so as to move along with the second end of the bimetallic strip. The overload protection indication type key switch provided by the utility model is convenient to use, safe and reliable.

Description

Technical Field

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

[0002] An overload protection push-button switch is a push-button switch with overload open-circuit protection ability, which has a basic push-button switch structure and an overload open-circuit element. A push-button switch is a convenient push-on and off type of switch, which realizes conduction or cut-off through pressing, with convenient operation and stable and reliable on-off states. The push-button switch includes a ratchet push-button assembly, a moving contact piece, and a static contact piece. The moving contact piece and the static contact piece are cooperatively arranged in the housing, and the moving contact piece can elastically deform to contact and connect or disconnect from the static contact piece; one end of the ratchet assembly abuts against the moving contact piece to drive the 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. The overload open-circuit element is mostly a thermally deformable element, such as a bimetal sheet; the bimetal sheet is connected in the conductive structure of the push-button switch and deforms to disconnect the conductive structure after overload to achieve open-circuit protection.

[0003] During actual use, after the bimetal sheet deforms and opens the circuit, the circuit structure of the push-button switch will be directly disconnected. However, after eliminating the cause of overload, it is inconvenient to reset the bimetal sheet, and it is also impossible to know whether there is an overload after the open circuit. Only system troubleshooting can be carried out, which makes the use of the overload protection function inconvenient to a certain extent. Summary of the Invention

[0004] This application provides an overload protection indicating switch, aiming to at least solve the technical problems of poor overload state indication, inconvenient use, and inconvenient overload reset operation of the overload protection push-button switch to a certain extent. For this purpose,

[0005] An embodiment of this application provides an overload protection indicating push-button switch, which includes a housing and a ratchet push-button assembly, a bimetal sheet, and an elastic contact piece arranged in the housing. The first end of the bimetal sheet is fixed in the housing, the second end of the bimetal sheet is provided with a static contact point, the free end of the elastic contact piece is provided with a contact part that can be detachably connected to the static contact point, and the ratchet push-button assembly abuts against the contact part. Under the action of an external force, the ratchet push-button assembly pushes the contact part to move to connect or separate the contact part from the static contact point; the overload protection indicating push-button switch further includes:

[0006] A reset linkage member having a rotating shaft, the two ends of the rotating shaft are rotatably arranged on the housing, the reset linkage member 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;

[0007] The indicating member is movably disposed on the housing, and the indicating member is lapped on the second end of the bimetal sheet to move following the second end of the bimetal sheet.

[0008] In some embodiments, the indicating member includes a columnar portion movably embedded in a guiding hole formed in the housing, and the columnar portion is lapped on the second end of the bimetal sheet.

[0009] In some embodiments, the indicating member further includes a radial flange disposed on the circumferential side of the columnar portion, and the radial flange abuts against one side of the guiding hole.

[0010] In some embodiments, the radial flange is lapped on the second end of the bimetal sheet, and under the action of an external force, the indicating member pushes the second end of the bimetal sheet to move.

[0011] In some embodiments, the indicating member further includes an identification section disposed at one end of the columnar portion outside the housing.

[0012] In some embodiments, a through hole is formed in the middle of the bimetal sheet, an extension arm extending into the through hole is provided at the second end of the bimetal sheet, and the stationary contact is disposed at the end of the extension arm;

[0013] 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.

[0014] In some embodiments, the connecting arm and the reset arm are disposed on the circumferential side surface of the rotating shaft.

[0015] In some embodiments, a hook portion is provided on the connecting arm, the hook portion is lapped on the contact portion, and a hanging arm is provided on the contact portion, and the hanging arm cooperates with the hook portion for lapping.

[0016] 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 along the width direction of the bimetal sheet, wherein the orthogonal direction of the connection line between the first end and the second end of the bimetal sheet is the width direction of the bimetal sheet.

[0017] In some embodiments, the elastic contact piece and the reset linkage member are arranged at intervals along the length direction of the bimetal sheet, wherein the length direction of the bimetal sheet is the direction of the connection line between the first end and the second end of the bimetal sheet.

[0018] The embodiments of the present application at least have the following beneficial effects:

[0019] The overload protection indicating push-button switch provided by the embodiment of the present application includes a housing, and a ratchet push-button assembly, an elastic contact piece, a bimetal piece, a reset linkage and an indicator arranged in the housing. One end of the elastic contact piece is installed in the housing, and the contact part of the other end abuts against one end of the ratchet push-button assembly and can deform and move under the drive of the ratchet push-button assembly; the first end of the bimetal piece is installed in the housing, and the second end is provided with a static contact, which cooperates to connect or move away from the contact part of the second end of the elastic contact piece to realize the function of the push-button switch; by using the characteristic of the bimetal piece deforming under overload, the static contact at the second end of the bimetal piece can deform and move along with the second end of the bimetal piece to disconnect the electrical connection with the elastic contact piece, so as to realize overload power-off protection; on the other hand, a movable indicator is also arranged on the housing and is lapped with the second end of the bimetal piece, so that when the second end of the bimetal piece deforms and displaces under overload, the indicator can be moved to displace its position, so as to be able to transmit an indication signal of the overload state to the outside; after the bimetal piece resets, the indicator can also reset, so as to cancel the overload indication, thereby improving the use convenience of the switch.

[0020] On the other hand, the reset linkage is rotatably arranged on the housing, and a connecting arm and a reset arm are arranged on the reset linkage, so that the reset arm deflects along with the rotation of the reset linkage. The connecting arm of the reset linkage is connected to the contact part of the elastic contact piece, and the movement track of the reset arm intersects with the track of the second end of the bimetal piece deforming and displacing under overload, that is, the reset arm is arranged on the overload deformation displacement track of the bimetal piece. Thus, when the bimetal piece deforms under overload, its second end deforms and displaces and approaches or even abuts against the reset arm; at this time, the contact part can be displaced by pressing the ratchet push-button assembly, so as to drive the reset linkage to rotate through the connecting arm, so that the reset arm deflects, and thus push against the second end of the bimetal piece along the reverse direction of the overload deformation displacement of the second end of the bimetal piece, forcing it to move and reset, so as to realize the reset of the shape and position of the bimetal piece after overload and ensure the functional reliability of the switch structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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 following drawings are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained according to these drawings without creative efforts.

[0022] Figure 1 FIG. shows an exploded structural schematic diagram of the overload protection indicating push-button switch in the embodiment of the present application;

[0023] Figure 2 Shows Figure 1 a schematic diagram of the assembled state of the overload protection indicating push-button switch in

[0024] Figure 3 Shows Figure 1 a schematic diagram of the structure of the internal functional mechanism of the overload protection indicating push-button switch in

[0025] Figure 4 Shows Figure 1 a schematic diagram of the assembled state of the elastic contact piece, bimetallic strip and reset linkage of the overload protection indicating push-button switch in

[0026] Figure 5 Shows Figure 3 a schematic diagram of the off-state structure of the overload protection indicating push-button switch in

[0027] Figure 6 Shows Figure 3 a schematic diagram of the on-state structure of the overload protection indicating push-button switch in

[0028] Figure 7 Shows Figure 3 a schematic diagram of the overload state structure of the overload protection indicating push-button switch in Detailed implementation manners

[0029] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0030] In addition, the present application may repeat reference numerals and / or reference letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or arrangements discussed. In addition, the present application provides examples of various specific processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and / or the use of other materials.

[0031] Next, the present application will be described in conjunction with the accompanying drawings and with reference to specific embodiments:

[0032] In an overload protection push-button switch based on a ratchet push-button assembly and a bimetal strip, 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 push-button assembly. By pressing the ratchet push-button assembly, the elastically movable contact piece can be driven to approach and connect or disconnect and move away from the static contact piece to achieve the switch function, and the connection and disconnection states are maintained through the self-locking function of the ratchet push-button assembly. And the overload protection function is achieved through the overload deformation ability of the bimetal strip. However, during use, the overload state cannot be intuitively indicated, and the user needs to systematically check, which is inconvenient to use. Moreover, the overload reset operation is inconvenient, and there are certain safety risks.

[0033] Therefore, the embodiment of the present application provides an overload protection indicating push-button switch, which improves the convenience of overload indication, the use safety and the reliability of the switch function of the overload protection push-button switch to a certain extent.

[0034] Figure 1 The exploded structural schematic diagram of the overload protection indicating push-button switch in the embodiment of the present application is shown; Figure 2 Shown is Figure 1 The assembled state schematic diagram of the overload protection indicating push-button switch in Figure 3 Shown is Figure 1 The structural schematic diagram of the internal functional mechanism of the overload protection indicating push-button switch in Figure 4 Shown is Figure 1 The assembled state schematic diagram of the elastic contact piece, the bimetal strip and the reset linkage of the overload protection indicating push-button switch in Figure 5 Shown is Figure 3 The off-state structural schematic diagram of the overload protection indicating push-button switch in Figure 6 Shown is Figure 3 The on-state structural schematic diagram of the overload protection indicating push-button switch in Figure 7 Shown is Figure 3 The overload-state structural schematic diagram of the overload protection indicating push-button switch in

[0035] See Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 and Figure 7 Referring to Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 , in some embodiments, an overload-sensitive element is arranged in the push-button switch of the overload protection type push-button switch and is connected in the conductive structure of the push-button switch, such as a bimetal strip, to track the overload state, and the overload protection function is achieved through the overload deformation and displacement. A reset structure is configured to realize the attitude and position reset of the bimetal strip after power-off to ensure the stability and reliability of the switch function. At the same time, in order to indicate the overload state, an indicating mechanism capable of reflecting the deformation state of the bimetal strip is required to transmit the overload signal to the outside.

[0036] The overload protection indicating push-button switch may include a housing 1, and a ratchet button assembly 2, an elastic contact piece 3, a bimetallic strip 4, a reset linkage 5, and an indicator 6 provided on the housing 1; the elastic contact piece 3 and the bimetallic strip 4 are detachably connected in cooperation, 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 bimetallic strip 4 to disconnect the connection with the bimetallic strip 4, so as to realize the on-off function of the switch; and when overloaded, the bimetallic strip 4 is deformed and displaced to disconnect the connection between the bimetallic strip 4 and the elastic contact piece 3, so as to realize overload open-circuit protection. The indicator 6 is movably provided on the housing 1 and is lapped with the second end of the bimetallic strip 4 to move along with the second end of the bimetallic strip 4, so that when overloaded, the indicator 6 will also shift along with it, thereby transmitting an overload signal to the outside.

[0037] The reset linkage 5 is connected to the free end of the elastic contact piece 3 and is arranged to match the position of the bimetallic strip 4, so that after the bimetallic strip 4 is deformed and displaced due to overload, by pressing the ratchet button assembly 2, the free end of the elastic contact piece 3 is displaced to drive the reset linkage 5 to act, forcing the bimetallic strip 4 to reset to the position and posture before overload, ensuring the reliability of the switch function. At the same time, the indicator 6 will also reset to the initial position to cancel the overload indication signal.

[0038] Specifically, the housing 1 is the bearing basis for the entire push-button switch, used to accommodate or install other functional components such as the ratchet button assembly 2, the elastic contact piece 3, the bimetallic strip 4, the reset linkage 5, and the indicator 6. The housing 1 can also be used as the installation basis for the push-button switch and is configured to be installed on other product structures. For example, the housing 1 can be installed on various electrical devices such as a power strip.

[0039] The ratchet button assembly 2 is disposed on the housing 1 and can be elongated or shortened along the pressing direction and maintain the state and position after pressing, so as to cooperate with pressing the elastic contact piece 3 to switch it between two positions and maintain the switched position, so as to realize the switching of the connection and separation states of the elastic contact piece 3 and the bimetallic strip 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, so as to realize the switching between the upper and lower two positions and realize the function of the switch button.

[0040] The elastic contact piece 3 is a conductive contact piece and can be deformed and displaced to a certain extent; the first end of the elastic contact piece 3 is a fixed end 31, which can be installed and fixed in the housing 1. The second end of the elastic contact piece 3 is a free end 32, and the free end 32 can move under the action of an external force; a contact portion 32a can be provided at the free end 32 of the elastic contact piece 3 for contacting and connecting the bimetallic strip 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.

[0041] The bimetallic strip 4 is an electrical connection element. The first end 41 of the bimetallic strip 4 is installed in the housing 1. A static contact 42a is provided at the second end 42 of the bimetallic strip 4, 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, a large amount of heat will be generated, 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, causing a large deformation and displacement of the second end 42 of the bimetallic strip 4, and the static contact 42a will also be greatly displaced, so as to disconnect the connection with the contact portion 32a, thus realizing the overload protection open circuit function.

[0042] The indicating member 6 is an element for indicating the external overload state. It is movably provided on the housing 1 and is lapped with the second end 42 of the bimetallic strip 4 and can follow the movement of the second end of the bimetallic strip 4 to reflect the current deformation state of the bimetallic strip 4.

[0043] The reset linkage 5 is a component that drives the bimetal 4 after overload deformation 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 3 and the second end 42 of the bimetal 4. After overload, it follows the movement of the elastic contact 3 to drive the second end 42 of the bimetal 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 bimetal 4. Thus, when the bimetal 4 undergoes overload deformation, the second end 42 of the bimetal 42 will move towards the reset arm 52 or move together with the reset arm 52. After the bimetal 4 resets, the indicator 6 will also follow the reset.

[0044] It should be noted that the bimetal 4 has a conventional position and posture, that is, a preset switch working position, to ensure that the static contact 42a on the bimetal 4 can cooperate with the contact portion 32a of the elastic contact 3 to maintain a stable electrical connection state or a disconnected 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 bimetal 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.

[0045] When reset is required, after the bimetal 4 undergoes overload deformation, to restore the switch function of the push-button switch, that is, the static contact 42a is reset to the preset switch working position; the free end 32 of the elastic contact 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, thereby driving the reset linkage 5 to rotate, so as to drive the reset arm 52 to move the second end 42 of the bimetal 42, enabling the second end 42 of the bimetal 4 to move in the direction opposite to the overload deformation direction of the second end 42 of the bimetal 42 and finally reset to the position and posture before overload deformation to restore the cooperative switch function between the bimetal 4 and the elastic contact 3 and improve the reliability of the switch function.

[0046] 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 3 is also switched, that is, it is moved away from the conduction working position and returned to the open-circuit working position to avoid risks such as electric shock or re-overload when the circuit is instantaneously conducted after the bimetal 4 resets, ensuring the electrical safety after reset. At the same time, through structural design, integrating the operation of switching the switch state of the push-button switch and the reset operation into one pressing operation also simplifies the reset operation to a certain extent and improves the operation convenience.

[0047] The overload protection indicating push-button switch provided by the embodiment of the present application includes a housing and a ratchet button assembly, an elastic contact piece, a bimetal piece, a reset linkage and an indicator arranged in the housing. One end of the elastic contact piece is installed in the housing, and the contact part of the other end abuts against one end of the ratchet button assembly and can deform and move under the drive of the ratchet button assembly; the first end of the bimetal piece is installed in the housing, and the second end is provided with a static contact, which is cooperatively connected to or away from the contact part of the second end of the elastic contact piece to realize the function of the push-button switch; by utilizing the characteristic of the bimetal piece deforming under overload, the static contact at the second end of the bimetal piece can deform and move along with the second end of the bimetal piece to disconnect the electrical connection with the elastic contact piece, so as to realize overload power-off protection; on the other hand, a movable indicator is also arranged on the housing and is lapped with the second end of the bimetal piece, so that when the second end of the bimetal piece deforms and displaces under overload, the indicator can be moved to displace its position, so as to be able to transmit an indication signal of the overload state to the outside; after the bimetal piece is reset, the indicator can also be reset, so as to cancel the overload indication, thereby improving the use convenience of the switch.

[0048] On the other hand, the reset linkage is rotatably arranged on the housing, and a connecting arm and a reset arm are arranged on the reset linkage, so that the reset arm deflects along with the rotation of the reset linkage. The connecting arm of the reset linkage is connected to the contact part of the elastic contact piece, and the movement track of the reset arm intersects with the track of the second end of the bimetal piece deforming and displacing under overload, that is, the reset arm is arranged on the overload deformation displacement track of the bimetal piece. Thus, when the bimetal piece deforms under overload, its second end deforms and displaces and approaches or even abuts against the reset arm; at this time, the contact part can be displaced by pressing the ratchet button assembly, so as to drive the reset linkage to rotate through the connecting arm, so that the reset arm deflects, and thus push against the second end of the bimetal piece along the reverse direction of the overload deformation displacement of the second end of the bimetal piece, forcing it to move and reset, so as to realize the reset of the shape and position of the bimetal piece after overload, and ensure the functional reliability of the switch structure.

[0049] In some embodiments, the indicator 6 can be set as a movable part that can protrude from the housing 1, so that when the indicator 6 moves along with the second end 42 of the bimetal piece 4, different protruding positions will appear, so as to be able to intuitively indicate whether it is in an overload state at present.

[0050] Specifically, a guiding hole 121 is formed on the housing 1, and the indicator 6 is movably inserted into the guiding hole 121 and can move directionally to stably indicate the position of the second end 42 of the bimetal piece 4 to reflect whether there is overload at present.

[0051] In some embodiments, the indicator 6 may be provided as a rod, including a columnar portion 61, and the columnar portion 61 is movably inserted into the guiding hole 121. The columnar portion 61 may be lapped on the second end 42 of the bimetal sheet 4 and move along with the second end 42 of the bimetal sheet 4.

[0052] In some embodiments, the indicator 6 and the bimetal sheet 4 are in a separable lapping state and there is a risk of disengaging from the guiding hole 121. For this reason, a radial flange 62 may be provided on the circumferential side of the columnar portion 61 to prevent the columnar portion 61 from disengaging from the guiding hole 121.

[0053] Generally, the radial flange 62 may be blocked outside the side port of the guiding hole located inside the housing 1, so that the bimetal sheet 4 can be manually and forcibly reset by pressing the indicator 6, thereby realizing a relief reset operation and increasing the safety and reliability of the reset operation.

[0054] In some embodiments, the radial flange 62 may be directly lapped on the second end 42 of the bimetal sheet 4.

[0055] Generally, the radial flange 62 may be lapped on one surface of the second end 42 of the bimetal sheet 4 on the side of the overload deformation direction.

[0056] In some embodiments, a bayonet may be provided on the columnar portion 61 for clamping on the edge of the second end 42 of the bimetal sheet 4, so as to achieve stable connection.

[0057] The reset member 6 can also be pushed to achieve manual forced reset.

[0058] In some embodiments, in order to achieve eye-catching indication, an identification section 63 may be provided at one end of the indicator 6 located outside the housing 1.

[0059] The identification section 63 may include an eye-catching color tone layer such as a red layer, or may also be formed of a red material, such as a red sleeve, a red cover, etc.

[0060] In some embodiments, a through hole 43 penetrating the bimetal sheet 4 is provided 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 may be disposed at the free end of the extension arm 44, that is, the end portion located inside the through hole 43. Thus, when the bimetal sheet 4 is overloaded and deformed, the moving direction of the static contact 42a is opposite to the moving direction of the second end 42 of the bimetal sheet 4.

[0061] That is to say, when the bimetal 4 is deformed due to overload, the static contact 42a moves away from the contact portion 32a following the extension arm 44, and the second end 42 of the bimetal 4 moves towards the contact portion 32a, thereby realizing the overload power-off function.

[0062] 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 4 to move and finally reset, so that the static contact 42a moves towards the contact portion 32a following the extension arm 44 and finally resets to the preset switch working position.

[0063] It should be noted that the overload condition occurs when the contact portion 32a is connected and energized with the static contact 42a. At this time, both the ratchet button assembly 2 and the elastic contact piece 3 are in the on working position of the push-button switch; for overload reset, it is usually necessary to press the ratchet button assembly 2 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 push-button switch, that is, the position where the free end 32 of the elastic contact piece 3 is far from the static contact 42a of the bimetal 4, which is the pressing stroke for closing the push-button switch in the general understanding.

[0064] By the position cooperation of the reset linkage 5 with the elastic moving contact piece 3 and the bimetal 4, integrating the reset operation of the bimetal 4 into the off 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 into the off operation of the ratchet button assembly 2, the operation can be simplified and the operation convenience can be improved.

[0065] In some embodiments, in order to enable the reset linkage 5 to deflect synchronously 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 static contact 42a of the bimetal 4, the reset linkage 5 can be set as a lever principle mechanism, and the connecting arm is moved by the contact portion 32a, thereby driving the reset linkage 5 to deflect, so that the reset arm 52 moves the second end 42 of the bimetal 4.

[0066] Specifically, the reset linkage 5 may include a rotating shaft 53 rotatably connected to the housing 1 as an action fulcrum of the reset linkage 5; the connecting arm 51 and the reset arm 42 may 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.

[0067] 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, causing the static contact 42a to move and reset.

[0068] In some embodiments, in order to reduce the structural complexity of the reset linkage 5, the connecting arm 51 and the reset arm 52 may be 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 substantially equivalent to the moving stroke of the free end 32 of the elastic contact piece 3, thereby simplifying the specification grading design of the connecting arm 51 and the reset arm 52.

[0069] 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 may be arranged on the same side of the plate surface of the bimetal 4.

[0070] Generally, the rotating shaft 53 may 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.

[0071] 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 key switch to a certain extent.

[0072] In some embodiments, both ends of the rotating shaft 53 are rotatably connected inside the housing 1. Correspondingly, the connecting arm 51 and the reset arm 52 may be arranged in the middle region of the rotating shaft 53.

[0073] Generally, in order to simplify the structure, the rotating shaft 53 may be set as a rod, and both ends of the rotating shaft 53 are set as cylindrical shapes to achieve smooth rotation.

[0074] 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 of 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.

[0075] 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.

[0076] 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 kept at a certain distance; 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, so that 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, realizing efficient and stable reset.

[0077] 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.

[0078] Generally, the hook portion 51a can be lapped on the side of the contact portion 32a away from the bimetal 4, so that during the process of the contact portion 32a moving away from the bimetal 4, that is, during the stroke of turning off the push-button 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.

[0079] 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.

[0080] In some embodiments, in order to facilitate the connection of the hook portion 51a, a hanging arm 32b can be arranged on one side of the contact portion 32a for adaptively hooking the hook portion 51a.

[0081] In some embodiments, the reset arm 52 and the second end 42 of the bimetal 4 can be in a non-fixed connection form, such as relatively open forms like lapping and abutting, or kept at a certain gap.

[0082] That is, the reset arm 52 is located on the deformed and bent side of the second end 42 of the bimetal sheet 4. When the reset linkage 5 moves following the free end 32, the reset arm 52 pushes against the second end 42 of the bimetal sheet 4 to move it back to its original position.

[0083] In some embodiments, the reset arm 52 can be configured as a block-shaped member with a contact surface adapted to the second end 42 of the bimetal sheet 4 for contacting and pushing against the bimetal sheet 4.

[0084] In some embodiments, the bimetal sheet 4 can also be of other forms, but the basic principle is the same. In an overloaded state, the bimetal sheet 4 will deform and shift in a set direction. According to the deformation and shift direction of the second end of the bimetal sheet 4, the reset linkage 5 can be arranged accordingly so that when the contact portion 32a is driven to shift by pressing the ratchet button assembly 2, the reset linkage 5 is synchronously driven to rotate to push and reset the second end 42 of the bimetal sheet 4.

[0085] For example, the bimetal sheet 4 can be configured as an integral sheet member, with one end fixed inside 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 moving away 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.

[0086] 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.

[0087] Generally, the reset arm 52 can be arranged 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.

[0088] In some embodiments, the elastic contact piece 3 and the reset linkage 5 can be arranged at intervals along the length direction of the bimetal sheet 4. For example, the fixed end 31 of the elastic contact piece 3 can be fixed on one side of the first end 41 of the bimetal sheet 4, the free end 32 of the elastic contact piece 3 is suspended in the middle of the bimetal sheet 4, and the reset linkage 5 is located on one side of the second end 42 of the bimetal sheet 4.

[0089] In some embodiments, in order to reduce the length of the key switch, the elastic contact piece 3 may be disposed 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 disposed 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 oppositely disposed in a matching manner with the stationary contact point 42a.

[0090] In some embodiments, in order to facilitate external connection to other structures, a conductive contact piece 45 may be connected to the first end 41 of the bimetal piece 4.

[0091] In this application, unless otherwise clearly specified and defined, 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 top of” 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”, “below” and “beneath” 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.

[0092] In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms “center”, “longitudinal”, “transverse”, “length”, “width”, “thickness”, “upper”, “lower”, “front”, “rear”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer”, “clockwise”, “counterclockwise” is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to this application.

[0093] It should be noted that all the directional indications in the embodiments of the present application are only used to explain the relative positional relationship, movement conditions, etc. between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly. In 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 components or the interaction relationship between two components, 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. In addition, in the present application, descriptions such as "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more, unless otherwise clearly and specifically limited.

[0094] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means 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.

[0095] In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present application.

[0096] 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 deformations 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 indicating push-button switch, comprising a housing, a ratchet push-button assembly, a bimetal sheet and an elastic contact piece arranged in the housing, a first end of the bimetal sheet is fixed in the housing, a static contact is arranged at a second end of the bimetal sheet, a contact part detachably connected to the static contact is arranged at a free end of the elastic contact piece, the ratchet push-button assembly abuts against the contact part, and under the action of an external force, the ratchet push-button assembly pushes the contact part to move so as to connect or disconnect the contact part from the static contact; characterized in that, The overload protection indicating push-button switch further includes: A reset linkage member having a rotating shaft, both ends of the rotating shaft being rotatably disposed on the housing. The reset linkage member has a connecting arm and a reset arm. The connecting arm is used to connect the contact portion, and the reset arm is used to connect the second end of the bimetal sheet. An indicating member movably disposed on the housing, and the indicating member is lapped on the second end of the bimetal sheet to move along with the second end of the bimetal sheet.

2. The overload protection indicating push-button switch according to claim 1, wherein The indicating member includes a columnar portion movably embedded in a guiding hole formed in the housing, and the columnar portion is lapped on the second end of the bimetal sheet.

3. The overload protection indicating type push-button switch according to claim 2, wherein, The indicating member further includes a radial flange disposed on the circumferential side of the columnar portion, and the radial flange abuts against one side of the guiding hole.

4. The overload protection indicating push-button switch according to claim 3, wherein The radial flange is lapped on the second end of the bimetal sheet. Under the action of an external force, the indicating member pushes the second end of the bimetal sheet to move.

5. The overload protection indicating push-button switch according to claim 2, wherein, The indicating member further includes an identification section disposed at one end of the columnar portion located outside the housing.

6. The overload protection indicating push-button switch according to claim 1, wherein A through hole is formed in the middle of the bimetal sheet. An extension arm extending into the through hole is provided at the second end of the bimetal sheet, and the stationary contact is disposed at the end of the extension arm. In the direction of the line connecting 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.

7. The overload protection indicating push-button switch according to claim 1, characterized in that, The connecting arm and the reset arm are disposed on the circumferential side surface of the rotating shaft.

8. The overload protection indicating push-button switch according to any one of claims 1 to 7, characterized in that, A hook portion is provided on the connecting arm, the hook portion is lapped on the contact portion, and a hanging arm is provided on the contact portion, and the hanging arm cooperates with the hook portion for lapping.

9. The overload protection indicating push-button switch according to any one of claims 1 to 7, characterized in that, 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 width direction of the bimetal sheet. Wherein, the orthogonal direction of the line connecting the first end and the second end of the bimetal sheet is the width direction of the bimetal sheet.

10. The overload protection indicating push-button switch according to any one of claims 1 to 7, characterized in that, The elastic contact piece and the reset linkage member are spaced apart along the length direction of the bimetal sheet. Wherein, the length direction of the bimetal sheet is the direction of the line connecting the first end and the second end of the bimetal sheet.

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