Key type overload protection switch

Abstract

The utility model discloses a button type overload protection switch, which comprises a shell, a button module, a trigger piece, an electric connection assembly, a bimetallic strip and a contact assembly, an opening is formed in the top of the shell, and a limiting part is formed on the inner wall and forms a limiting path; the key module is movably connected to the opening, the key module is provided with a guide end, and the guide end extends into the limiting part and moves along the limiting path; the trigger piece is rotationally connected to the limiting part, and the guide end is movably connected with the trigger piece; the electric connection assembly comprises a first contact terminal and a second contact terminal which are arranged at an interval, and one end of the first contact terminal and one end of the second contact terminal penetrate out of the bottom of the shell; the bimetallic strip is provided with a fixed end and a movable end which are oppositely arranged, the fixed end is connected with the first contact terminal, and the movable end is clamped with the trigger piece; the contact assembly comprises a first contact and a second contact which are movably attracted, the first contact is arranged on the second contact terminal, and the second contact is arranged on the second contact terminal.

Description

TECHNICAL FIELD

[0001] The utility model relates to circuit protection switch technical field, specifically, it relates to a key type overload protection switch. BACKGROUND

[0002] The overload protection switch usually adopts a thermal bimetallic strip as an operating element, which is automatically disconnected when the thermal bimetallic strip is deformed and bent due to the heat generated by an overload current.

[0003] For example, the activation mechanism of the switch device disclosed in US patent No. US6788186B1 includes a housing having a path defined therein and a protrusion surrounded by the path, a first terminal and a second terminal each having an end portion located in the housing and another end extending from the bottom of the housing, the terminal having a first contact point housing at the end thereof; a push member is movably engaged on the top of the housing, and two positioning springs are biased between the push member and the housing, a guide pin is pivotally connected to the push member and has an insert movably engaged with the path in the housing. A bimetallic plate connected to the first terminal at one end and including a free portion, a second contact point connected to the free portion and located above the first contact point, and a driving plate rotatably connected to the housing and including a polygonal hole through which the insert of the guide pin and the protrusion extend, the polygonal hole including a first recess, a second recess and a third recess, when the guide pin is engaged with the first recess, the switch device is in an off state when the guide pin is engaged with the second recess, and the second recess allows the insert of the guide pin to not hinder the rotation of the driving plate. When overloaded, the hook portion extends from the driving plate and holds the free end of the bimetallic plate.

[0004] The existing press switch has the following problems: since the driving plate is rotatable, and the hook portion of the driving plate has a moving space with the free end of the bimetallic plate when the driving plate is connected with the bimetallic plate, which causes the driving plate and the bimetallic plate to easily fall off, and the positional relationship between the bimetallic plate and the driving plate is uncertain during assembly, which can only be manually assembled during part of the manufacturing process, which is not convenient for automatic assembly process, resulting in low production efficiency and high product processing cost. And due to manual work, the product consistency is not high enough, the product parameters are unstable, which affects the comprehensive performance and quality of the product to some extent. UTILITY MODEL CONTENTS

[0005] In view of the deficiencies of the prior art, a key type overload protection switch is provided.

[0006] To achieve the above objectives, this utility model provides a push-button overload protection switch, including a housing, a push-button module, a trigger element, an electrical connection assembly, a bimetallic strip, and a contact assembly. The housing has an opening at the top and a limiting portion formed on the inner wall, creating a limiting path. The push-button module is movably connected to the opening and has a guide end that extends into the limiting portion and moves along the limiting path. The trigger element is rotatably connected to the limiting portion, and the guide end is movably connected to the trigger element. The electrical connection assembly includes a first contact terminal and a second contact terminal, spaced apart. One end of the first contact terminal and one end of the second contact terminal are located inside the housing, while the other ends of the first and second contact terminals protrude from the bottom of the housing. The bimetallic strip has a fixed end and a movable end arranged opposite to each other. The fixed end is connected to the first contact terminal, and the movable end is engaged with the trigger element. The contact assembly includes a first contact and a second contact, with the first contact located at the second contact terminal and the second contact located at the second contact terminal, and the first and second contacts movably engaging.

[0007] According to one embodiment of the present invention, the trigger includes a rotating part and a locking part. The rotating part is rotatably connected to the limiting part. The rotating part has a polygonal hole that corresponds to the limiting path. The guide end passes through the polygonal hole and moves in the limiting path. The locking part is vertically disposed on one side of the rotating part and extends outward. The locking part has a locking interface, and the edge of the movable end has a notch. The locking interface engages with the notch.

[0008] According to one embodiment of the present invention, the button module includes a bracket, a drive rod, a button, and at least two springs. The bracket is movably disposed in an opening. One end of the drive rod is pivotally connected to the inner wall of the bracket, and the guide end is disposed at the other end of the drive rod. The button protrudes from the surface of the bracket. The two springs are disposed at intervals at the bottom of the bracket, and the two ends of each spring abut against the bracket and the housing, respectively.

[0009] According to one embodiment of the present invention, the polygonal hole includes a first hole position, a second hole position, and a third hole position. When the guide end is located in the first hole position, the push-button overload protection switch is in the on state; when the guide end is located in the second hole position, the push-button overload protection switch is in the off state.

[0010] According to one embodiment of the present invention, it further includes an indicator light disposed inside the housing; the electrical connection assembly further includes a third contact terminal, which is spaced apart from the second contact terminal on the side away from the first contact terminal, and one end of the third contact terminal extends out of the bottom of the housing; the indicator light has a positive electrode pin and a negative electrode pin, the positive electrode pin of the indicator light is connected to the second contact terminal, and the negative electrode pin of the indicator light is connected to the third contact terminal.

[0011] According to an embodiment of the utility model, the shell includes a body and a cover, the body is provided with a mounting port on one side, the cover includes a cover wall and a mounting table, the cover wall covers the mounting port, the mounting table is protruded on the side of the cover wall facing the body, and the display lamp is arranged on the mounting table.

[0012] According to an embodiment of the utility model, the adjusting assembly further includes an adjusting piece and an elastic sheet, the adjusting piece has an adjusting end, the adjusting end is inserted into the shell from the bottom of the shell, one end of the elastic sheet is connected with the adjusting end, and the other end of the elastic sheet is provided with a buckle port.

[0013] According to an embodiment of the utility model, two guide grooves are arranged on one side of the shell, two limiting pieces are arranged on the support correspondingly, and the support is arranged in the opening, and each limiting piece is arranged in a guide groove.

[0014] According to an embodiment of the utility model, the bottom of the body is provided with a clamping groove, and a clamping piece is arranged in the clamping groove; the cover further includes a fitting part, the fitting part is protruded on the side of the cover wall facing the body, the fitting part is provided with a clamping position, the cover wall covers the body, the fitting part is arranged in the clamping groove, and the clamping piece is clamped in the clamping position.

[0015] According to an embodiment of the utility model, the cover further includes at least one abutting piece and two connecting pieces, the at least one abutting piece is arranged on the edge of the cover wall opposite to the fitting part, and the abutting piece is movably abutted on the inner wall of the mounting port; the at least two connecting pieces are arranged on the side of the cover wall close to the body, and the body is correspondingly provided with two connecting positions, and each connecting piece is movably buckled in a connecting position.

[0016] The utility model discloses have the beneficial effect that through the mutual clamping of the movable end of the trigger piece and the bimetallic strip, the bimetallic strip and the trigger piece are prevented from being separated. BRIEF DESCRIPTION OF DRAWINGS

[0017] The drawings described herein are used to provide further understanding of the present application, constitute a part of the present application, and the illustrative embodiments and the description thereof are used to explain the present application, and do not constitute improper limitation on the present application.

[0018] Figure 1 It is the perspective view of the key type overload protection switch in the embodiment.

[0019] Figure 2 It is the explosion drawing of the key type overload protection switch in the embodiment.

[0020] Figure 3 Another exploded view of the key type overload protection switch in the embodiment;

[0021] Figure 4 A schematic view of the shell in the embodiment;

[0022] Figure 5 A sectional view of the connection between the key and the driving rod in the embodiment;

[0023] Figure 6 A schematic view of the driving rod in the embodiment;

[0024] Figure 7 A schematic view of the trigger in the embodiment;

[0025] Figure 8 A schematic view of the bimetallic strip in the embodiment;

[0026] Figure 9 A schematic view of the key type overload protection switch in the cut-off state in the embodiment;

[0027] Figure 10 A schematic view of the key type overload protection switch in the on state in the pressing state in the embodiment;

[0028] Figure 11 A schematic view of the key type overload protection switch in the on state in the continuous pressing of the key in the embodiment;

[0029] Figure 12 A schematic view of the key type overload protection switch in the overload state in the embodiment;

[0030] Figure 13 A schematic view of the key type overload protection switch in the pressing of the button in the overload state in the embodiment;

[0031] Figure 14 A schematic view of the connection between the body and the cover in the embodiment;

[0032] Figure 15 Another schematic view of the connection between the body and the cover in the embodiment;

[0033] Figure 16 A schematic view of the adjusting assembly in the embodiment.

[0034] Reference sign explanation

[0035] 1 - shell; 10 - opening; 11 - body; 110 - mounting port; 111 - clamping groove; 112 - clamping piece; 113 - abutting position; 12 - cover; 121 - cover wall; 122 - mounting table; 123 - fitting part; 1230 - clamping position; 124 - abutting piece; 125 - abutting piece; 13 - guide groove; 100 - limiting part; 101 - limiting path;

[0036] 2-pressing module; 20-guiding end; 21-bracket; 211-limiting member; 22-driving rod; 220-protrusion; 23-key; 231-abutting member; 232-spring piece; 24-spring;

[0037] 3-trigger; 31-rotating part; 310-polygonal hole; 311-first hole position; 312-second hole position; 313-third hole position; 32-clamping part; 321-clamping interface;

[0038] 4-electric connection assembly; 41-first contact terminal; 42-second contact terminal; 43-third contact terminal;

[0039] 5-bimetallic strip; 51-fixed end; 52-movable end; 520-notch; 521-buckle;

[0040] 6-contact assembly; 61-first contact; 62-second contact;

[0041] 7-display lamp;

[0042] 8-adjusting assembly; 81-adjusting member; 810-adjusting end; 82-spring piece. DETAILED DESCRIPTION

[0043] In the following, a plurality of embodiments of the present application will be disclosed with reference to the drawings. For the purpose of clear illustration, a plurality of practical details will be described in the following description. However, it should be appreciated that these practical details should not be used to limit the present application. That is, in some embodiments of the present application, these practical details are not necessary. In addition, for the purpose of simplifying the drawings, some conventional structures and components will be shown in the drawings in a simple schematic manner.

[0044] In addition, in the present application, the description such as "first", "second", etc. is only for the purpose of description, and does not particularly mean the order or sequence, nor limit the present application. It is merely for the purpose of distinguishing components or operations described by the same technical terms, and should not be understood as indicating or implying the relative importance of the technical features indicated or the number of technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the realization of a person skilled in the art. When the combination of technical solutions contradicts each other or cannot be realized, it should be considered that the combination of technical solutions does not exist, nor is it within the protection scope required by the present application.

[0045] Please refer to Figures 1-4 , Figure 1 is a perspective view of a key type overload protection switch, Figure 2An exploded view of the key type overload protection switch, Figure 3 Another exploded view of the key type overload protection switch, Figure 4 A schematic view of the shell. The present embodiment provides a key type overload protection switch, which comprises a shell 1, a key module 2, a trigger 3, an electrical connection assembly 4, a bimetallic strip 5 and a contact assembly 6. Specifically, the shell 1 is provided with an opening 10 at the top, and the inner wall of the shell 1 forms a limiting portion 100, and a limiting path 101 is formed in the limiting portion 100. The key module 2 is movably arranged in the opening 10. The key module 2 is formed with a guide end 20, which extends into the limiting portion 100, and the guide end 20 moves along the limiting path 101. The trigger 3 is rotatably connected to the limiting portion 100, the guide end 20 is movably connected to the trigger 3, and the trigger 3 is connected to the bimetallic strip 5. The trigger 3 is used for the transmission connection of the key module 2 and the bimetallic strip 5, and by changing the position of the guide end 20 in the limiting portion 100, the trigger 3 can be rotated. Since the trigger 3 is connected to the bimetallic strip 5, when the trigger 3 is rotated, the position of the bimetallic strip 5 can be changed.

[0046] The electrical connection assembly 4 comprises a first contact terminal 41 and a second contact terminal 42, which are arranged at intervals, and one end of the first contact terminal 41 and the second contact terminal 42 is arranged in the shell 1, and the other end of the first contact terminal 41 and the second contact terminal 42 extends out of the bottom of the shell 1, which is convenient for wire connection.

[0047] The bimetallic strip 5 has a fixed end 51 and a movable end 52 arranged opposite to each other, the fixed end 51 is connected to the first contact terminal 41, and the movable end 52 is clamped to the trigger 3, and the movable end 52 can change its position in the vertical direction relative to the fixed end 51.

[0048] In this example, since the bimetallic strip 5 and the trigger 3 are clamped to each other, they are stably connected. During installation, the movable end 52 is clamped to the trigger 3, the movable end 52 of the bimetallic strip 5 supports the trigger 3, so that the bimetallic strip 5 and the trigger 3 are relatively fixed, and then the bimetallic strip 5 and the trigger 3 are installed in the shell 1 at the same time. In this way, the bimetallic strip 5 and the trigger 3 are fixed to each other, avoiding displacement of the two during assembly, which leads to inaccurate alignment, thereby facilitating the alignment and assembly of the key type overload protection switch, facilitating automatic assembly, effectively improving the performance of the product, and avoiding the bimetallic strip 5 and the trigger 3 from falling off during use.

[0049] The contact assembly 6 comprises a first contact 61 and a second contact 62, the first contact 61 is arranged on the first contact terminal 41, and the second contact 62 is arranged on the movable end 52 of the bimetallic strip 5, and the first contact 61 and the second contact 62 can be movably attracted. When the first contact 61 and the second contact 62 are attracted, the first contact terminal 41 is conducted through the bimetallic strip 5 and the second contact terminal 42, at this time, the overload protection switch is in a conducting state; when the first contact 61 and the second contact 62 are separated, the first contact terminal 41 and the second contact terminal 42 are not conducted, at this time, the overload protection switch is in a non-conducting state.

[0050] In actual use, when the overload protection switch is in a non-conducting state, the button module 2 is pressed, the button module 2 drives the guide end 20 to move, and the guide end 20 moves along the limiting path 101 of the limiting portion 100. In the movement process of the guide end 20, the trigger 3 rotates and drives the bimetallic strip 5 connected with the trigger 3 to move, so that the first contact 61 and the second contact 62 on the bimetallic strip 5 change the attraction state, thereby changing the use state of the overload protection switch.

[0051] Please refer to Figure 2 Further, the button module 2 comprises a bracket 21, a driving rod 22, a button 23 and at least two springs 24, wherein the bracket 21 is movably arranged at the opening 10 of the shell 1, one end of the driving rod 22 is pivotally connected to the bracket 21, and the guide end 20 is arranged at the other end of the driving rod 22. The bracket 21 can drive the driving rod 22 to move, and when the driving rod 22 moves, the guide end 20 can move along the limiting portion 100. The button 23 is protruded on the surface of the bracket 21, which is convenient for the user to press the switch. The springs 24 are arranged at the bottom of the bracket 21 in intervals, and one end of each spring 24 abuts against the bracket 21, and the other end abuts against the inside of the shell 1, so that the bracket 21 is elastically connected with the shell 1 through the springs 24. In this example, the two springs 24 are arranged at the opposite ends of the diagonal line at the bottom of the bracket 21, so that the bracket 21 remains stable when it elastically moves.

[0052] Please refer to Figure 3 and Figure 5 , Figure 5 It is a sectional view of the connection between the button and the driving rod. In this example, in order to prevent the driving rod 22 from being disconnected from the bracket 21, one side of the button 23 facing the shell 1 is provided with an abutting piece 231, and one side of the abutting piece 231 facing the driving rod 22 is provided with a spring piece 232. When connected, one end of the driving rod 22 is pivotally connected to the inner side of the bracket 21, the abutting piece 231 extends into the bracket 21, and one side of the spring piece 232 facing the driving rod 22 abuts against the driving rod 22, so as to avoid the driving rod 22 from falling off the bracket 21 during rotation.

[0053] Please refer to Figure 6 , Figure 6The schematic diagram of the driving rod. Further, the middle section of the driving rod 22 is bent to form a convex part 220, which is used to disperse the stress of the driving rod 22, and can effectively avoid the driving rod 22 from being bent when the support 21 drives the driving rod 22 to move downward.

[0054] Please refer to Figure 7 With Figure 8 , Figure 7 The schematic diagram of the trigger, Figure 8 The schematic diagram of the bimetallic strip. The trigger 3 includes a rotating part 31 and a clamping part 32. The rotating part 31 is rotationally connected to the limiting part 100, and the rotating part 31 is provided with a polygonal hole 310, and the polygonal hole 310 corresponds to the limiting path 101. When connected, the guide end 20 passes through the polygonal hole 310, and then extends into the limiting part 100 to move along the limiting path 101 in the limiting part 100. The clamping part 32 is vertically arranged on the side of the rotating part 31 and extends outward. The clamping part 32 is provided with a clamping hole 321, and the edge of the movable end 52 is provided with a notch 520. When installed, the clamping hole 321 is clamped with the notch 520, so that the trigger 3 is clamped with the bimetallic strip 5 firmly.

[0055] Further, the polygonal hole 310 includes a first hole position 311, a second hole position 312, and a third hole position 313, and the polygonal hole 310 corresponds to the shape of the limiting part 100. When the guide end 20 of the driving rod 22 engages with the first hole position 311, the overload protection switch is in a closed state; when the guide end 20 of the driving rod 22 engages with the second hole position 312, the overload protection switch is in a conducting state. The third hole position 313 is used to avoid the guide end 20 of the driving rod 22.

[0056] Please refer to Figures 9-10 , Figure 9 The schematic diagram of the key type overload protection switch in the off state, Figure 10 The schematic diagram of the key type overload protection switch in the on state under the pressing state. In a specific use scenario, when the key type overload protection switch is in the off state, the key 23 is pressed, the key 23 drives the support 21 to press downward, and the spring 24 is compressed. The driving rod 22 is driven downward by the support 21, the guide end 20 of the driving rod 22 moves along the limiting path 101, and then drives the trigger 3 to move counterclockwise. The guide end 20 will continue to move along the moving path 101 in the limiting part 100, the clamping part 32 of the trigger 3 drives the movable end 52 of the bimetallic strip 5 to displace downward, so that the bimetallic strip 5 is conducted with the second contact terminal 42 through the contact assembly 6. When the key 23 is released, the spring 24 drives the support 21 to restore by using the elastic potential, the support 21 drives the driving rod 22 to lift upward, the guide end 20 of the driving rod 22 is hooked on the second hole position 312 of the limiting part 100, so that the rotating part 31 remains stable, and the overload protection switch is in the conducting state.

[0057] When the button 23 is pressed again, the bracket 21 drives the driving rod 22 to move downward, the guide end 20 of the driving rod 22 moves to the right, drives the trigger 3 to rotate clockwise, and the clamping part 32 of the trigger 3 drives the movable end 52 of the bimetallic strip 5 to lift, so that the bimetallic strip 5 is separated from the second contact terminal 42. When the button 23 is released, the spring 24 drives the bracket 21 to move upward, and the bracket 21 drives the driving rod 22, at this time the guide end 20 of the driving rod 22 hooks the first hole position 311 of the rotating part 31, so that the rotating part 31 remains fixed, and the clamping part 32 supports the movable end 52 of the bimetallic strip 5, so that the bimetallic strip 5 remains in a separated state from the second contact terminal 42. At this time, the overload protection switch is in an open circuit state.

[0058] Please refer to Figure 11 , Figure 11 It is a schematic diagram of the button type overload protection switch in the on state. It should be noted that when the button type overload protection switch is in the on state, if the button 23 is continuously pressed, the button 23 drives the bracket 21 to press downward, and the driving rod 22 is driven by the bracket 21, at this time the guide end 20 of the driving rod 22 falls into the third hole position 313, and the button type overload protection switch is still in the on state. When the button type overload protection switch is overloaded, the bimetallic strip 5 can be tripped by heat. The movable end of the bimetallic strip 5 drives the clamping part 32 of the trigger 3 to displace upward, and since the guide end 20 of the driving rod 22 hooks the moving path 101 in the limiting part 100, the trigger 3 can normally rotate and is not affected by the driving rod 22. Thus, in actual use scenarios, when the button type overload protection switch is in the on state, if foreign matter is pressed on the surface of the button 23, the button type overload protection switch can still be tripped, effectively improving the safety of the button type overload protection switch.

[0059] Please refer to Figure 12 , Figure 12 It is a schematic diagram of the button type overload protection switch in the on state. It should be noted that when the button type overload protection switch is in the on state, if the button 23 is continuously pressed, the button 23 drives the bracket 21 to press downward, and the driving rod 22 is driven by the bracket 21, at this time the guide end 20 of the driving rod 22 falls into the third hole position 313, and the button type overload protection switch is still in the on state. When the button type overload protection switch is overloaded, the bimetallic strip 5 can be tripped by heat. The movable end of the bimetallic strip 5 drives the clamping part 32 of the trigger 3 to displace upward, and since the guide end 20 of the driving rod 22 hooks the moving path 101 in the limiting part 100, the trigger 3 can normally rotate and is not affected by the driving rod 22. Thus, in actual use scenarios, when the button type overload protection switch is in the on state, if foreign matter is pressed on the surface of the button 23, the button type overload protection switch can still be tripped, effectively improving the safety of the button type overload protection switch.

[0060] Please refer to Figure 13 , Figure 13This diagram illustrates the operation of a push-button overload protection switch when the button is pressed during an overload. When the overload protection switch is in an overload state, pressing button 23 again causes bracket 21 to drive drive rod 22, moving guide end 20. Trigger element 3 rotates, causing bimetallic strip 5 to force first contact 61 into contact with second contact 62. However, due to deformation of bimetallic strip 5 under overload conditions, first contact 61 separates from second contact 62. Bimetallic strip 5 then drives drive element to rotate, moving guide end 20 to the third hole 313, preventing guide end 20 from rotating trigger element 3. Therefore, under overload conditions, pressing button 23 cannot keep the push-button overload protection switch in a conductive state. This effectively improves the safety of the overload protection switch.

[0061] Please refer to Figure 14 and Figure 15 , Figure 14 This is a schematic diagram showing the connection between the main body and the cover. Figure 15 This is another schematic diagram showing the connection between the main body and the cover. To ensure a stable connection between the button module 2 and the housing 1, guide grooves 13 are respectively provided on opposite sides of the housing 1. The bracket 21 is provided with corresponding limiting members 211. When the bracket 21 is placed on the main body 11, each limiting member 211 is located in one of the guide grooves 13. When the button 23 is pressed and the bracket 21 moves relative to the housing 1, the limiting member 211 moves vertically along the guide groove 13, thereby ensuring the direction of movement of the bracket 21.

[0062] Please refer to Figure 2 In addition, the overload protection switch also includes an indicator light 7, which is located inside the housing 1 and is used to indicate the operating status of the overload protection switch. Specifically, the electrical connection assembly 4 also includes a third contact terminal 43, which is spaced apart from the second contact terminal 42 on the side away from the first contact terminal 41, and one end of the third contact terminal 43 extends out of the bottom of the housing 1. The third contact terminal 43 is used to connect to the ground wire. The indicator light 7 has a positive terminal and a negative terminal. The positive terminal of the indicator light 7 is connected to the second contact terminal 42, and its negative terminal is connected to the third contact terminal 43.

[0063] When the bimetallic strip 5 is connected to the second contact terminal 42 through the contact assembly 6, the overload protection switch is in the ON state, causing the positive pin of the indicator lamp 7 to conduct, and the indicator lamp 7 lights up. When the bimetallic strip 5 is separated from the second contact terminal 42, the overload protection switch is in the OFF state, and the positive pin of the indicator lamp 7 cannot be connected to the current, and the indicator lamp 7 is off. Therefore, by observing the ON and OFF states of the indicator lamp 7, the operating status of the overload protection switch can be quickly determined.

[0064] Please refer to Figure 3 and Figures 14-15Further, the shell 1 comprises a body 11 and a cover 12, the body 11 is provided with a mounting opening 110 on one side, and the cover 12 covers the mounting opening 110. The cover 12 comprises a cover wall 121 and a mounting table 122, the mounting table 122 is protruded on the side of the cover wall 121 facing the body 11, and the display lamp 7 is arranged on the mounting table 122. During assembly, the cover wall 121 is connected with the body 11, and the mounting table 122 extends into the shell 1, so that the display lamp 7 is accommodated in the shell 1.

[0065] By arranging the mounting table 122 on the cover wall 121, the assembly position of the display lamp 7 is fixed, and at the same time, the mounting table 122 arranged in the shell 1 can avoid occupying the assembly space of the shell 1 itself, which is convenient for the assembly of parts in the shell 1, simplifies the assembly steps, and is beneficial to the automatic assembly mode.

[0066] In order to realize the movable connection between the body 11 and the cover 12, the bottom of the body 11 is provided with a clamping groove 111, and a clamping piece 112 is arranged in the clamping groove 111. The cover 12 further comprises a fitting part 123, the fitting part 123 is protruded on the side of the cover wall 121 facing the body 11, and the fitting part 123 is provided with a clamping position 1230, when the cover wall 121 covers the body 11, the fitting part 123 is located in the clamping groove 111, and the clamping piece 112 is clamped in the clamping position 1230, so that the cover 12 is buckled with the body 11.

[0067] The cover 12 further comprises at least one abutting piece 124 and two abutting pieces 125. Among them, at least one abutting piece 124 is arranged on the edge of the cover wall 121 opposite to the fitting part 123, and the abutting piece 124 is movably abutted with the inner wall of the mounting opening 110. In this example, the cover 12 comprises two abutting pieces 124, which are arranged on the edge of the cover wall 121 in a spaced manner, so that the cover wall 121 is connected with the shell 1 more stably.

[0068] The two abutting pieces 125 are arranged on the side of the cover wall 121 close to the body 11 in a spaced manner, and the body 11 is correspondingly provided with two abutting positions 113. When the cover 12 is connected with the body 11, the abutting piece 124 is abutted with the inner wall of the mounting opening 110, and each abutting piece 125 is buckled in one abutting position 113, which provides support for the cover 12 and prevents the cover 12 from falling under the action of gravity.

[0069] The cover body 12 is movably connected with the shell 1 through the embedded part 123, the abutting part 124 and the abutting part 125. In the assembling process, the abutting part 124 of the cover body 12 is inserted into the mounting port 110, so that the cover body 12 is connected with the body 11, then the cover wall 121 is rotated around the abutting part 124, so that the abutting part 125 is inserted into the abutting position 113, the embedded part 123 is inserted into the clamping groove 111, and the clamping part 112 is embedded in the clamping position 1230, thereby completing the connection of the cover body 12 and the body 11. When the cover body 12 needs to be disassembled, a force is applied to the abutting part 124, so that the cover wall 121 is rotated around the abutting part 124 in a direction away from the body 11, so that the clamping part 112 is separated from the clamping position 1230 and the embedded part 123 is separated from the clamping groove 111, and then the abutting part 124 is separated from the body 11, so that the disassembly of the cover body 12 is completed. Compared with the traditional connection mode of the cover body 12 and the body 11, the connection mode adopted in the embodiment is quick and convenient, the connection is stable, and the cover body 12 is convenient to disassemble and assemble.

[0070] Please refer to Figure 2 and Figure 16 , Figure 16 is a schematic view of the adjusting assembly. Further, the overload protection switch further comprises an adjusting assembly 8. The adjusting assembly 8 comprises an adjusting part 81 and an elastic sheet 82. The adjusting part 81 has an adjusting end 810 which extends into the shell 1 from the bottom of the shell 1. One end of the elastic sheet 82 is clamped with the adjusting end 810, and the other end of the elastic sheet is provided with a buckling port 820. The movable end of the bimetallic strip 5 is provided with a buckle 521 which is inserted into the buckling port 820, so that the two are stably connected. In the assembling process, since the buckle 521 of the bimetallic strip 5 can be directly inserted into the buckling port 820, the automatic equipment can be directly used to abut the elastic sheet 82 and the bimetallic strip 5, avoiding manual connection of the buckle 521 and the buckling port 820. In this way, the automatic assembling mode is facilitated, the assembling speed is greatly improved, and the production capacity is effectively improved.

[0071] In actual use, the position of the adjusting end 810 in the vertical direction can be changed by screwing the adjusting part 81, so that the bending degree of the elastic part is changed, thereby the reaction time of the bimetallic strip 5 can be changed, so that the reaction time of the overload protection switch can be adjusted.

[0072] The above merely describes the embodiments of the present application and is not used to limit the present application. The present application can be variously changed and modified by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of the claims of the present application.

Claims

1. A pushbutton overload protection switch, characterized in that Include: The shell (1), button module (2), trigger (3), electrical connection assembly (4), bimetallic strip (5) and contact assembly (6); The shell (1) top is equipped with opening (10), the inner wall forms the limiting portion (100), the limiting portion (100) forms the limiting path (101); The button module (2) is movably connected to the opening (10), the button module (2) has a guide end (20), the guide end (20) is inserted into the limiting portion (100) and moves along the limiting path (101); The trigger (3) is rotatably connected to the limiting portion (100), the guide end (20) is movably connected with the trigger (3); The electrical connection assembly (4) includes first contact terminal (41) and second contact terminal (42), the first contact terminal (41) and the second contact terminal (42) are spaced apart, one end of the first contact terminal (41) and one end of the second contact terminal (42) are arranged in the shell (1), the other end of the first contact terminal (41) and the other end of the second contact terminal (42) are arranged in the shell (1) bottom; The bimetallic strip (5) has a fixed end (51) and a movable end (52) arranged opposite, the fixed end (51) is connected to the first contact terminal (41), the movable end (52) is connected to the trigger (3); The contact assembly (6) includes first contact (61) and second contact (62), the first contact (61) is arranged in the second contact terminal (42), the second contact (62) is arranged in the second contact terminal (42), the first contact (61) and the second contact (62) are movably attracted.

2. The key-operated overload protection switch of claim 1, wherein The trigger (3) includes a rotating part (31) and a clamping part (32), the rotating part (31) is rotatably connected to the limiting portion (100), the rotating part (31) is provided with a polygonal hole (310), the polygonal hole (310) corresponds to the limiting path (101), the guide end (20) passes through the polygonal hole (310) and moves in the limiting path (101), the clamping part (32) is vertically arranged on one side of the rotating part (31) and extends outward; The clamping part (32) is provided with a clamping hole (321), the edge of the movable end (52) is provided with a notch (520), the clamping hole (321) is clamped with the notch (520).

3. The pushbutton overload protection switch of claim 1, wherein, The button module (2) includes a bracket (21), a drive rod (22), a button (23) and at least two springs (24), the bracket (21) is movably arranged in the opening (10); One end of the drive rod (22) is pivotally connected to the inner wall of the bracket (21), the guide end (20) is arranged at the other end of the drive rod (22); The button (23) is protruded on the surface of the bracket (21); Two springs (24) are arranged at the bottom of the bracket (21), and the two ends of each spring (24) are respectively abutted with the bracket (21) and the shell (1).

4. The key-operated overload protection switch of claim 2, wherein The polygonal hole (310) comprises a first hole position (311), a second hole position (312) and a third hole position (313), when the guide end (20) is located at the first hole position (311), the key type overload protection switch is in a conductive state; when the guide end (20) is located at the second hole position (312), the key type overload protection switch is in a cut-off state.

5. The key-operated overload protection switch of claim 1, wherein Further comprising a display lamp (7), which is arranged inside the shell (1); the electric connection assembly (4) further comprises a third contact terminal (43), which is arranged on the side of the second contact terminal (42) away from the first contact terminal (41), and one end of the third contact terminal (43) penetrates through the bottom of the shell (1); the display lamp (7) has a positive electrode pin and a negative electrode pin, the positive electrode pin of the display lamp (7) is connected with the second contact terminal (42), and the negative electrode pin of the display lamp (7) is connected with the third contact terminal (43).

6. The key-operated overload protection switch of claim 5, wherein The shell (1) comprises a body (11) and a cover (12), one side of the body (11) is provided with a mounting opening (110), the cover (12) comprises a cover wall (121) and a mounting table (122), the cover wall (121) is arranged on the mounting opening (110), and the mounting table (122) is arranged on the side of the cover wall (121) facing the body (11); the display lamp (7) is arranged on the mounting table (122).

7. The key-operated overload protection switch of claim 1, wherein Further comprising an adjusting assembly (8), the adjusting assembly (8) comprises an adjusting piece (81) and an elastic sheet (82), the adjusting piece (81) has an adjusting end (810), the adjusting end (810) penetrates into the shell (1) from the bottom of the shell (1), one end of the elastic sheet (82) is connected with the adjusting end (810), and the other end of the elastic sheet (82) is provided with a buckling opening (820); one end of the movable end (52) is provided with a buckle (521), and the buckle (521) is inserted into the buckling opening (820).

8. The key-operated overload protection switch of claim 3, wherein Opposite surfaces of the shell (1) are respectively provided with guide grooves (13), the bracket (21) is correspondingly provided with limiting pieces (211), and each limiting piece (211) is arranged in a guide groove (13) when the bracket (21) is arranged on the opening (10).

9. The key-operated overload protection switch of claim 6, wherein, The bottom of the body (11) is provided with a clamping groove (111), and a clamping piece (112) is arranged in the clamping groove (111); the cover (12) further comprises an embedded part (123), the embedded part (123) is arranged on the side of the cover wall (121) facing the body (11), the embedded part (123) is provided with a clamping position (1230), and when the cover wall (121) is arranged on the body (11), the embedded part (123) is located in the clamping groove (111), and the clamping piece (112) is clamped in the clamping position (1230).

10. The key-operated overload protection switch of claim 9, wherein The cover (12) further comprises at least one abutting member (124) and two pairs of abutting members (125). The at least one abutting member (124) is arranged on the edge of the cover wall (121) opposite to the fitting part (123), and the abutting member (124) is movably abutted to the inner wall of the mounting port (110). The two pairs of abutting members (125) are arranged on the side of the cover wall (121) close to the body (11), and the body (11) is correspondingly provided with two pairs of abutting positions (113). Each abutting member (125) is movably buckled to one abutting position (113).

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