Wiring terminal switch with overload protection

Abstract

The utility model discloses a wiring terminal switch with overload protection. The wiring terminal switch comprises a housing assembly, a button assembly movably arranged on the housing assembly, a conductive assembly and a terminal assembly. The conductive assembly comprises a movable contact piece, a bimetallic strip and a static contact piece, the terminal assembly comprises a first terminal movably arranged on the shell assembly, and the static contact piece is arranged in the first terminal in a penetrating manner and is clamped between the shell and the base; the bimetallic strip comprises a conductive contact piece arranged opposite to the button assembly and the action end of the movable contact piece and a reset part arranged far away from the conductive contact piece, a reset rod set is arranged between the reset part and the button assembly, and the reset rod set abuts against the button assembly in a normal state and actuates downwards along with the pressing action of the button assembly; the conductive contact piece is arranged to be bent away from the movable contact piece in the overload state, the reset part is arranged to be warped towards the reset rod set in the overload state, and the warped position of the reset part is located in the reset stroke of the reset rod set.

Description

Technical Field

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

[0002] Overload protection refers to an overload protection device installed to prevent the main power line from being damaged due to overheating of the protector caused by overload. The overload protection switch is suitable for protecting the safety of household, industrial and other electronic and electrical equipment. If the voltage is unstable or other electronic components are defective, etc., it will cause excessive current, which is likely to damage the electronic components, and is more likely to cause short circuits such as burning, and even electric shock, causing unnecessary accidents such as fires.

[0003] On the basis of the above, it is also necessary to set overload protection on the socket strip and socket to further reduce potential safety hazards.

[0004] A push-button switch with overload protection in the prior art realizes overload protection by arranging a bimetallic strip inside, which can bend under overload conditions. However, when this kind of push-button switch with a bimetallic strip is applied to the push-button switch of the terminal, due to the fixed shape of the conductive connecting piece between the bimetallic strip and the movable terminal, there will be poor contact when the movable terminal is adjusted, or the position of the conductive connecting piece is unstable. Content of the Utility Model

[0005] Aiming at the deficiencies of the prior art, the purpose of the utility model is to provide a terminal switch with overload protection.

[0006] The above technical purpose of the utility model is achieved by the following technical solutions: A terminal switch with overload protection, comprising:

[0007] A housing assembly composed of a relatively arranged housing and a base, a button assembly movably arranged on the housing assembly, and a conductive assembly and a terminal assembly arranged inside the housing assembly;

[0008] The conductive assembly includes a moving contact piece and a bimetallic strip arranged relative to the button assembly, and a static contact piece connected to the bimetallic strip. The terminal assembly includes a first terminal movably arranged on the housing assembly. The static contact piece is inserted into the first terminal and clamped between the housing and the base. The first terminal is actuated by a bolt and is movable relative to the static contact piece;

[0009] The bimetal sheet includes a conductive contact sheet disposed opposite to the action ends of the button assembly and the moving contact sheet, and a reset portion disposed away from the conductive contact sheet. A reset rod group is provided between the reset portion and the button assembly. The reset rod group is in contact with the button assembly under normal conditions and is actuated downward with the pressing action of the button assembly. The conductive contact sheet is configured to bend away from the moving contact sheet in an overload state, and the reset portion is configured to warp toward the reset rod group in an overload state. The warping position of the reset portion is within the reset stroke of the reset rod group.

[0010] Further, a lamp assembly is provided inside the button assembly, and a first conductive spring and a second conductive spring that are electrically connected to the lamp assembly. The first conductive spring is electrically connected to the moving contact sheet. The terminal assembly includes a second terminal, and a conductive elastic member is provided between the second terminal and the second conductive spring. The elastic extension direction of the conductive elastic member is perpendicular to the adjustment direction of the second terminal.

[0011] Further, the conductive elastic member refers to a third conductive spring. The second conductive spring abuts against the third conductive spring, or the second conductive spring is clamped to the third conductive spring.

[0012] Further, a first guiding channel along the axial direction of the second conductive spring is provided inside the housing assembly, and a first holding block supported inside the housing assembly. The first holding block and the housing assembly together define a second guiding channel disposed along the extension direction of the conductive elastic member. The second guiding channel communicates with the first guiding channel and the second terminal.

[0013] Further, both the first conductive spring and the second conductive spring are arranged in the same direction as the pressing direction of the button assembly, and the conductive elastic member is perpendicular to the pressing direction of the button assembly.

[0014] [[ID=…]] Further, the reset rod group includes a reset member and a reset spring sleeved on the reset member. A connecting portion that abuts against the reset spring is provided at the upper end of the reset member. The connecting portion is close to or abuts against the button assembly under the action of the reset spring. At least a part of the reset member is placed inside the housing assembly and is arranged toward the reset portion.

[0015] Further, the reset member includes two rod bodies passing through the housing assembly, and the projection area of the rod bodies is within the projection area of the reset portion.

[0016] Further, a second holding block is also provided inside the housing assembly. The second holding block presses on the bimetal sheet and the static contact sheet, and the moving contact sheet is positioned on the second holding block with respect to the contour.

[0017] Furthermore, the static contact piece includes a first part placed in the first terminal, and a second part abutted between the second retaining block and the shell assembly, and a bent third part is provided between the first part and the second part, and the third part is perpendicular to the first part and the second part and abutted between the shell assembly.

[0018] Furthermore, the static contact piece is fixed to the bimetallic sheet by riveting, and clamping edges are provided on both sides of the static contact piece, and a clamping groove matching the clamping edges is provided on the housing assembly.

[0019] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0020] The utility model provides a bimetallic strip in the conductive assembly. Under normal conditions, the pressing action of the button assembly causes the moving contact to be connected with the bimetallic strip and the static contact. When overloaded, the conductive contact in the bimetallic strip deforms and moves away from the movable contact, thereby cutting off the power. At the same time, the reset portion of the bimetallic strip tilts up and approaches the reset rod assembly, and the reset rod assembly abuts against the button assembly. Therefore, when the button assembly is actuated again, the reset rod assembly abuts against the reset portion, forcing the bimetallic strip to reset, causing the conductive contact to return to a position ready to engage with the moving contact. The reset rod is reset synchronously with the reset pressing of the button assembly. Only one reset press is required, thereby simplifying the operation.

[0021] The static contact piece of the present invention is directly placed in the first terminal and extends relatively out of the first terminal, so that in the assembled state, the housing assembly presses the end of the static contact piece tightly, thereby ensuring the position stability of the static contact piece when the first terminal is movable and adjusted. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0023] Figure 2 This is a schematic diagram of the overall structure of the utility model from another angle;

[0024] Figure 3 This is a cross-sectional view of the first guide channel and the second guide channel of the present invention;

[0025] Figure 4 It is a cross-sectional view of the reset rod assembly of the utility model;

[0026] Figure 5 This is a schematic structural diagram of the conductive component of the present utility model;

[0027] Figure 6 This is a cross-sectional view of the static contact piece of the present utility model;

[0028] Figure 7 It is an exploded view of the utility model;

[0029] In the figure:

[0030] 1. Housing; 2. Base; 3. Button assembly; 3.1 Lamp assembly;

[0031] 4. Moving contact piece;

[0032] 5. Bimetal strip; 5.1 Conductive contact piece; 5.2 Reset part;

[0033] 6. Stationary contact piece; 6.1 First part; 6.2 Second part; 6.3 Third part; 6.4 Clamping edge;

[0034] 7. First terminal;

[0035] 8. Reset lever group; 8.1 Reset part; 8.2 Reset spring; 8.3 Rod body; 8.4 Connection part;

[0036] 9. First conductive spring; 10. Second conductive spring; 11. Conductive elastic part;

[0037] 12. First guiding channel; 13. Second guiding channel; 14. Second terminal; 15. First holding block; 16. Second holding block; 17. Limiting notch; 18. Limiting convex part; Detailed implementation manners

[0038] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0039] It should be understood that although the terms upper, middle, lower, top, one end, etc. appear in this text to describe various elements, these elements are not limited by these terms. These terms are only used to distinguish the elements from each other for easy understanding, rather than to define any directional or sequential limitations.

[0040] As Figures 1-7 shown, a wiring terminal switch with overload protection includes:

[0041] A housing assembly composed of a relatively arranged housing and base 2, a button assembly 3 movably arranged on the housing assembly, and a conductive assembly and a terminal assembly arranged in the housing assembly, wherein the terminal assembly is used to access and fix wires;

[0042] The conductive assembly includes a movable contact piece 4 and a bimetallic piece 5 disposed relative to the button assembly 3, and a stationary contact piece 6 connected to the bimetallic piece 5. The terminal assembly includes a first terminal 7 movably disposed on the housing assembly. The stationary contact piece 6 is disposed within the first terminal 7 and is sandwiched between the housing and the base 2. The first terminal 7 is actuated by a bolt and moves relative to the stationary contact piece 6.

[0043] The bimetallic strip 5 includes a conductive contact 5.1 disposed opposite the button assembly 3 and the actuating end of the movable contact 4, and a reset portion 5.2 disposed away from the conductive contact 5.1. The button assembly 3 is pressed to actuate the movable contact 4, causing it to contact the conductive contact 5.1. The movable contact 4 is then separated from the conductive contact 5.1 by the reset pressing action of the button assembly 3.

[0044] A reset rod group 8 is provided between the reset part 5.2 and the button assembly 3. The reset rod group 8 is in contact with the button assembly 3 under normal conditions and is actuated downward as the button assembly 3 is pressed. The conductive contact 5.1 is configured to bend away from the movable contact 4 under an overload condition, and the reset part 5.2 is configured to tilt toward the reset rod group 8 under an overload condition. The tilted position of the reset part 5.2 is within the reset stroke of the reset rod group 8. Therefore, when the button assembly 3 is pressed again after the overload, the button assembly 3 can drive the reset rod group 8 to descend and press the tilted reset part 5.2 to the normal position. The conductive contact 5.1 returns to the normal position synchronously with the action of the reset part 5.2.

[0045] It should be noted that the bimetallic strip 5 can be composed of two layers of metal sheets with different expansion coefficients. When the ambient temperature changes, the two layers of metal sheets expand or contract due to the temperature change, causing the bimetallic strip 5 to bend and deform. When the temperature rises, the deformation of the metal sheet with a larger expansion coefficient is greater than that of the metal sheet with a smaller expansion coefficient. The metal sheet with a larger expansion coefficient can squeeze the metal sheet with a smaller expansion coefficient, causing it to bend simultaneously. In the present invention, at least the extended edge is deformed. Therefore, when an overload occurs, the bimetallic strip 5 of the static contact assembly heats up due to excessive current and bends. The static contact at the end of the conductive contact 5.1 deforms and bends away from the movable contact 4, thereby achieving the overload power-off protection function. The reset portion 5.2 located on the conductive contact 5.1, away from the static contact, bends in the opposite direction of the static contact. For example, the static contact bends downward to separate from the movable contact 4 above, while the reset portion 5.2 bends upward, ready to be reset by the force from the pressure.

[0046] Under overload conditions, the static contact portion on the conductive contact piece 5.1 bends downward, and correspondingly, the reset portion 5.2 on the conductive contact piece 5.1 bends upward, causing the reset portion 5.2 to move toward the button assembly 3 so as to be pressed and actuated, thereby returning the conductive contact piece 5.1 to its initial position. The initial position specifically refers to the position where, under normal conditions, the movable contact piece 4 can be pressed by the button assembly 3 to contact the static contact.

[0047] like Figure 4 and Figure 5 and Figure 7 As shown, one of the purposes of the present invention is to provide a conductive component and an installation structure suitable for a terminal-type push button switch. The shell assembly is composed of a base 2 and a shell 1 that are interlocked with each other. A conductive connecting seat for arranging the terminal assembly is extended on the peripheral side of the base 2 and the shell 1. The terminal assembly includes a terminal unit placed in the conductive connecting seat and a bolt for adjusting the terminal unit.

[0048] Among them, a first retaining block 15 and a second retaining block 16 are provided in the shell assembly. The first retaining block 15 is provided corresponding to the reset portion 5.2 of the bimetallic strip 5, and the second retaining block 16 is provided corresponding to the connection position of the bimetallic strip 5 and the static contact piece 6. In addition, the first retaining block 15 and the second retaining block 16 are both abutted between the base 2 and the shell 1 in the vertical direction, and multiple corner parts are provided in the horizontal direction to further limit the displacement of the first retaining block 15 and the second retaining block 16 in the horizontal direction.

[0049] The first retaining block 15 is separated from the base 2 to provide a space for the reset portion 5.2 to tilt when overloaded. Optionally, the first retaining block 15 can also limit the tilting of the reset portion 5.2 to prevent the reset portion 5.2 from tilting excessively and being unable to return to its original position smoothly.

[0050] As for the second retaining block 16, it is pressed onto the bimetallic strip 5 and the static contact piece 6, and the dynamic contact piece 4 is positioned on the second retaining block 16 according to the contour, wherein the fixed part of the dynamic contact piece 4 has a limiting notch 17 that is aligned with the second retaining block 16, and the housing 1 is provided with a limiting protrusion 18 corresponding to the limiting notch 17, and the abutment and fixation of the dynamic contact piece 4 is achieved through the relative cooperation between the housing 1 and the base 2.

[0051] Specifically, the static contact piece 6 includes a first part 6.1 placed in the first terminal 7, and a second part 6.2 abutted between the second retaining block 16 and the housing assembly. A bent third part 6.3 is provided between the first part 6.1 and the second part 6.2. The third part 6.3 is perpendicular to the first part 6.1 and the second part 6.2 and abutted between the housing assemblies. Preferably, the first part 6.1 partially extends outside the first terminal 7 and is abutted between the housing assemblies. The first part 6.1 and the second part 6.2 are both fixed in a horizontal posture, and the third part 6.3 is fixed in a vertical posture.

[0052] Specifically, the static contact piece 6 is riveted to the bimetallic strip 5, and a clamping edge 6.4 is provided on both sides of the static contact piece 6. The housing assembly is provided with a clamping groove matching the clamping edge 6.4. Through the above improvements, the static contact piece 6 is fixed in the housing assembly, and the stability of the static contact piece 6 is not affected when the first terminal 7 is operated to rise and fall.

[0053] Further references Figure 4 As a further embodiment of the reset lever group 8, the reset lever group 8 includes a reset member 8.1 and a reset spring 8.2 sleeved on the reset member 8.1. The upper end of the reset member 8.1 is provided with a connecting portion 8.4 that abuts against the reset spring 8.2. The connecting portion 8.4 is close to or abuts against the button assembly 3 under the action of the reset spring 8.2. The reset member 8.1 is at least partially placed in the housing assembly and is arranged toward the reset portion 5.2. Under normal circumstances, a gap is reserved between the lower end of the reset member 8.1 and the reset portion 5.2 of the bimetallic strip 5. The gap is used to provide a space for the warping deformation of the reset portion 5.2. Space is provided so that the reset portion 5.2 rises when overloaded and approaches the lower end of the reset member 8.1, that is, the reset portion 5.2 enters the pressing stroke of the reset member 8.1. When the button assembly 3 is pressed, the button assembly 3 abuts the connecting portion 8.4 and drives the reset member 8.1 downward until the lower end of the reset member 8.1 presses the reset portion 5.2 in the raised posture. After the button assembly 3 is reset, the reset member 8.1 continues to abut against the button assembly 3 under the action of the reset spring 8.2 and is spaced apart from the reset portion 5.2 again. In this way, the synchronous action of the button assembly 3 and the reset rod group 8 is achieved.

[0054] Specifically, the reset member 8.1 includes two rod bodies 8.3 that pass through the housing assembly. The housing assembly is provided with a through hole for the rod body 8.3 to pass through. The outer diameter of the reset spring 8.2 is larger than the through hole. The rod body 8.3 is located within the projected area of the reset portion 5.2. The two rod bodies 8.3 press against both sides of the reset portion 5.2 to ensure that the reset portion 5.2 is reset to normal.

[0055] In this embodiment, the rod body 8 . 3 is specifically arranged on both sides of the first retaining block 15 .

[0056] Refer to Figure 3 As shown, in some other embodiments, a lamp component 3.1 is provided in the button component 3, as well as a first conductive spring 9 and a second conductive spring 10 that are electrically connected to the lamp component 3.1. The lamp component 3.1 is powered on as the button component 3 is pressed. The first conductive spring 9 is electrically connected to the moving contact piece 4. The terminal component includes a second terminal 14. A conductive elastic member 11 is provided between the second terminal 14 and the second conductive spring 10. The elastic extension direction of the conductive elastic member 11 is perpendicular to the adjustment direction of the second terminal 14.

[0057] In this embodiment, the second conductive spring 10 and the second terminal 14 are connected by the conductive elastic member 11, so that when the second terminal 14 is adjusted up and down, the conductive elastic member 11 can always abut against the second terminal 14 and will not be disconnected from the second terminal 14, thereby ensuring that the second conductive spring 10 can maintain an electrical connection with the second terminal 14.

[0058] Specifically, the conductive elastic member 11 refers to a third conductive spring, and the third conductive spring is preferably positioned in the housing component in a compressed state.

[0059] As a cooperation method of the third conductive spring, the second conductive spring 10 abuts against the third conductive spring. As another cooperation method of the third conductive spring, the second conductive spring 10 is clamped to the third conductive spring, so as to ensure the stable cooperation between the second conductive spring 10 and the conductive elastic member 11.

[0060] To further ensure the position stability of the conductive elastic member 11, a first guiding channel 12 along the axial direction of the second conductive spring 10 is provided in the housing component, and a first retaining block 15 supported in the housing component. The first retaining block 15 and the housing component together define a second guiding channel 13 arranged along the extension direction of the conductive elastic member 11. The second guiding channel is communicated with the first guiding channel 12 and the second terminal 14.

[0061] Among them, the first retaining block 15 has a concave contour, and the housing 1 has a concave contour relative to the first retaining block 15, so as to position the conductive elastic member 11 in the second guiding channel 13 to limit its vertical movement. At the same time, ensure the position stability of the conductive elastic member 11 when the button component 3 is pressed down.

[0062] Specifically, both the first conductive spring 9 and the second conductive spring 10 are arranged in the same direction as the pressing direction of the button component 3, and the conductive elastic member 11 is perpendicular to the pressing direction of the button component 3, so that the position of the conductive elastic member 11 is not affected when the button component 3 is pressed.

[0063] The present invention positions the internal moving contact piece 4, bimetallic strip 5 and static contact piece 6, as well as the conductive elastic member 11 through the first holding block 15 and the second holding block 16. At the same time, the first holding block 15 and the second holding block 16 are also pressed and fixed by the assembly and fixation of the base 2 and the shell 1 in the shell assembly. Among them, the static contact piece 6 docking with the first terminal 7 is fixed by the shell assembly, and the conductive elastic member 11 docking with the second terminal 14 is fixed in the second guide channel 13 to ensure that the position of the corresponding conductive components can be stable and the electrical connection can be reliable at any position of the first terminal 7 and the second terminal 14 during the adjustment process. At the same time, the present invention also provides a bimetallic strip 5 and a reset rod group 8 to ensure safety in an overload state and provide a convenient reset function for the switch.

[0064] In the above embodiment, the button assembly 3 refers to a button structure composed of two opposing ratchets, and the internal light assembly 3.1 has been fully disclosed in other applications of the applicant and even in the prior art, and will not be elaborated here.

[0065] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A terminal switch with overload protection, characterized in that, Comprising: A housing assembly composed of a relatively arranged housing and a base (2), a button assembly (3) movably arranged on the housing assembly, and a conductive assembly and a terminal assembly arranged inside the housing assembly; The conductive assembly includes a moving contact piece (4) and a bimetallic piece (5) arranged relative to the button assembly (3), and a static contact piece (6) connected to the bimetallic piece (5). The terminal assembly includes a first terminal (7) movably arranged on the housing assembly. The static contact piece (6) is inserted into the first terminal (7) and clamped between the housing and the base (2). The first terminal (7) is actuated by a bolt and is movable relative to the static contact piece (6); The bimetallic piece (5) includes a conductive contact piece (5.1) arranged opposite to the action ends of the button assembly (3) and the moving contact piece (4), and a reset portion (5.2) arranged away from the conductive contact piece (5.1). A reset rod group (8) is provided between the reset portion (5.2) and the button assembly (3). The reset rod group (8) abuts against the button assembly (3) under normal conditions and is actuated downward along with the pressing action of the button assembly (3). The conductive contact piece (5.1) is arranged to bend away from the moving contact piece (4) under an overload state. The reset portion (5.2) is arranged to warp towards the reset rod group (8) under an overload state. The warping position of the reset portion (5.2) is within the reset stroke of the reset rod group (8).

2. The wiring terminal switch with overload protection according to claim 1, characterized in that: A lamp assembly (3.1) is provided inside the button assembly (3), and a first conductive spring (9) and a second conductive spring (10) that are electrically connected to the lamp assembly (3.1). The first conductive spring (9) is electrically connected to the moving contact piece (4). The terminal assembly includes a second terminal (14). A conductive elastic member (11) is provided between the second terminal (14) and the second conductive spring (10). The elastic extension direction of the conductive elastic member (11) is perpendicular to the adjustment direction of the second terminal (14).

3. The terminal switch with overload protection according to claim 2, characterized in that: The conductive elastic member (11) refers to a third conductive spring. The second conductive spring (10) abuts against the third conductive spring, or the second conductive spring (10) is clamped to the third conductive spring.

4. The terminal switch with overload protection according to claim 2, characterized in that: A first guiding channel (12) along the axial direction of the second conductive spring (10) is provided inside the housing assembly, and a first holding block (15) supported inside the housing assembly. The first holding block (15) and the housing assembly together define a second guiding channel (13) arranged along the extension direction of the conductive elastic member (11). The second guiding channel communicates with the first guiding channel (12) and the second terminal (14).

5. The wiring terminal switch with overload protection according to claim 2, wherein: Both the first conductive spring (9) and the second conductive spring (10) are arranged in the same direction as the pressing direction of the button assembly (3). The conductive elastic member (11) is perpendicular to the pressing direction of the button assembly (3).

6. The wiring terminal switch with overload protection according to claim 1, characterized in that: The reset lever group (8) includes a reset member (8.1) and a reset spring (8.2) sleeved on the reset member (8.1). A connecting portion (8.4) that abuts against the reset spring (8.2) is provided at the upper end of the reset member (8.1). The connecting portion (8.4) approaches or abuts against the button assembly (3) under the action of the reset spring (8.2). At least a part of the reset member (8.1) is placed in the housing assembly and is arranged towards the reset portion (5.2).

7. The terminal switch with overload protection according to claim 6, wherein: The reset member (8.1) includes two rod bodies (8.3) passing through the housing assembly, and the projection area of the rod bodies (8.3) is located within the reset portion (5.2).

8. The terminal switch with overload protection according to claim 1, characterized in that: A second retaining block (16) is further provided in the housing assembly. The second retaining block (16) presses on the bimetal sheet (5) and the static contact piece (6), and the moving contact piece (4) is positioned on the second retaining block (16) with respect to the contour.

9. The terminal switch with overload protection according to claim 1, characterized in that: The static contact piece (6) includes a first portion (6.1) placed in the first terminal (7) and a second portion (6.2) abutted between the second retaining block (16) and the housing assembly. A bent third portion (6.3) is provided between the first portion (6.1) and the second portion (6.2). The third portion (6.3) is perpendicular to the first portion (6.1) and the second portion (6.2) and is abutted between the housing assemblies.

10. The terminal switch with overload protection according to claim 1, characterized in that: The static contact piece (6) is riveted and fixed to the bimetal sheet (5), and clamping edges (6.4) are provided on both sides of the static contact piece (6). A clamping groove matching the clamping edges (6.4) is provided on the housing assembly.

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