A safe switch

Abstract

The utility model discloses a safe switch, its technical scheme main points include casing, pivot in casing top surface button, first conductive part and second conductive part, be equipped with the placing space in the casing, the lower part of button has the trigger lever of extension, the action mechanism is installed with casing cooperation, and can swing with the pressing of button, the action mechanism includes elastomer and drive part, and the conduction between first conductive part and second conductive part is realized through its swing or disconnect, drive part is connected with casing, and its drive part is made of memory metal, and when being heated, produces the bending, drives elastomer and makes action mechanism whole swing to realize the circuit breaking, the utility model discloses when short circuit or abnormal heating, action mechanism can be in the heat and produce the deformation, and the whole swing of active drive self, realizes the automatic overheating protection and cuts off the power.

Description

Technical Field

[0001] This utility model relates to the field of switch technology, and more specifically to a safe switch. Background Technology

[0002] Currently, a power switch is a basic electronic component used to control the on / off state of a circuit. Its core function is to safely connect or disconnect the power supply to a device. It typically includes user-operated moving parts such as buttons or levers, core contacts responsible for switching current on and off, and a housing that provides insulation and protection. It is widely used in almost all electrical environments, from household appliances and office equipment to industrial machinery, automotive electronics, and data centers.

[0003] However, there are still some defects in the existing technology. Existing power switches have protective structures for safety, but these protective structures mostly rely on the displacement of the button. If the button cannot move upward due to pressure from external objects or wear at the pivot point, the moving contact and the conductive contact will still continue to conduct, which will burn out the switch and connected electronic products, and may even cause a fire. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a safe switch, comprising a housing, a button pivotally connected to the top surface of the housing, a first conductive part, and a second conductive part. The housing contains a placement space, and a trigger rod extends from the lower part of the button. An actuating mechanism is fitted into the housing and swings in response to button presses. The actuating mechanism includes an elastic body and a driving part, whose swinging motion enables the connection or disconnection between the first and second conductive parts. The driving part is connected to the housing and is made of shape memory metal, which bends when heated, causing the elastic body to swing the entire actuating mechanism to achieve circuit breaking.

[0005] The present invention is further configured such that: the elastic body is a bent spring sheet with one end connected to the drive unit vertically and the other end abutting against the trigger rod; the drive unit includes an electrical connection part at the left end for electrical connection and a connection protrusion at the right end for rotatable connection with the housing.

[0006] The present invention is further configured such that: the two sides of the connecting protrusion are bent downwards and a groove is provided at the bent end; and the housing is provided with a corresponding mounting protrusion that matches the groove.

[0007] The present invention is further configured such that: under normal conditions, the electrical connection part and the connecting protrusion of the driving part are on the same horizontal plane; under heated conditions, the transition part between the electrical connection part and the connecting protrusion will bend downward.

[0008] The present invention is further configured such that: one end of the elastomer near the button is provided with an opening formed by bending, and the opening has elastic deformation capability.

[0009] The present invention is further configured such that the end of the trigger rod is provided with a transition surface.

[0010] In summary, the present invention has the following beneficial effects: 1. By setting an action mechanism composed of shape memory metal and an elastomer, when the switch temperature rises to the critical point due to fault or overload, the shape memory metal sheet will produce significant deformation, thereby allowing the elastomer to directly drive the action mechanism to swing as a whole, automatically disconnecting the circuit, thus realizing a sensitive and reliable overheat protection function.

[0011] 2. By connecting the elastomer and the drive unit into a single molded metal part, the three functional units of current contact, elastic support and thermal actuator are integrated. During assembly, it can be directly snapped into the corresponding position of the housing, which reduces the number of parts and assembly steps and simplifies the structure and assembly process.

[0012] 3. By setting an elastic opening at the end of the elastomer, when it is heated and enters the open circuit state, the opening will abut against the trigger rod of the button, locking the mechanism in the open state to prevent accidental connection; when resetting, pressing the button again will allow the trigger rod to overcome the elastic deformation resistance of the opening and pass through it, thereby resetting the mechanism to the closed state. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this embodiment;

[0014] Figure 2 This is a schematic diagram of the normal open circuit state in this embodiment;

[0015] Figure 3 This is a schematic diagram of the action mechanism structure in this embodiment;

[0016] Figure 4 This is a schematic diagram of the working state of this embodiment;

[0017] Reference numerals: 1. Housing; 11. First conductive part; 12. Second conductive part; 13. Mounting protrusion; 2. Button; 21. Trigger rod; 211. Transition surface; 3. Actuating mechanism; 31. Elastic body; 311. Opening; 32. Driving part; 321. Electrical connection part; 322. Connecting protrusion; 3221. Groove. Detailed Implementation

[0018] The present invention will be further described in detail below with reference to the accompanying drawings.

[0019] This embodiment discloses a safe switch, such as Figures 1 to 2As shown, the device includes a housing 1, a button 2 pivotally connected to the top surface of the housing 1, a first conductive part 11, and a second conductive part 12. The housing 1 has a placement space. One end of the first conductive part 11 and the second conductive part 12 are located within the placement space, while the other end protrudes from the housing 1. A trigger rod 21 extends from the lower part of the button 2. The actuating mechanism 3 is fitted and installed with the housing 1 and can swing in response to the pressing of the button 2. The actuating mechanism 3 includes an elastic body 31 and a driving part 32, which swings to connect or disconnect the first conductive part 11 and the second conductive part 12. The driving part 32 is connected to the housing 1 and is made of shape memory metal. When heated, it bends, causing the elastic body 31 to swing the actuating mechanism 3 as a whole to achieve a circuit break. The actuating mechanism 33 has a conductive state (connecting the first conductive part 1112 and the second conductive part 1213) and an open-circuit state (short-circuiting the first conductive part 1112 and the second conductive part 1213). When button 22 is pressed, the trigger rod 2121 will swing. The swinging trigger rod 2121 will change its relative position with the action mechanism 33. Under the elastic force of the elastic body 3131, the action mechanism 33 will swing as a whole, thereby realizing the switching between the open circuit state and the conductive state.

[0020] like Figure 3 As shown, the elastic body 31 is a bent spring, one end of which is connected vertically to the drive unit 32, and the other end abuts against the trigger rod 21. The drive unit 32 and the elastic body 31 are connected, so that the bent spring and the memory metal sheet are combined into a whole. The trigger rod 21 and the elastic body 31 remain in contact, so that it is in a pre-compressed state under normal conditions and accumulates elastic potential energy. This pre-compressed force provides the driving conditions for the entire actuation mechanism 3. The drive unit 32 includes an electrical connection part 321 at the left end for electrical connection, which directly participates in the electrical connection to ensure that the current must flow through the memory metal, providing the conditions for its heating, and a connection protrusion 322 at the right end for rotatable connection with the housing 1.

[0021] Further improvements include downward bending of both sides of the connecting protrusion 322, with a groove 3221 at the bent end. The housing 1 also has a corresponding mounting protrusion 13 that matches the groove 3221. Preferably, in this embodiment, the groove 3221 is a stamped groove with an open circle profile, forming a snap-fit ​​structure to prevent components from falling off during installation, while allowing the drive unit 32 to rotate smoothly around the mounting protrusion 13. During installation, aligning the groove 3221 on the drive unit 32 with the mounting protrusion 13 on the housing 1 and pressing it down achieves a reliable rotational connection. The arrangement of the groove 3221 and the mounting protrusion 13 simplifies the installation process.

[0022] like Figure 4As shown, under normal conditions, the electrical connection 321 and the connecting protrusion 322 of the driving part 32 are on the same horizontal plane; under heated conditions, the transition portion between the electrical connection 321 and the connecting protrusion 322 will bend downwards. The driving part 32 is made of a shape memory metal sheet with a precise preset shape change. When the temperature rises to a set threshold, the metal sheet will undergo reversible deformation, thus presenting two completely different preset shapes between the high temperature state and the normal temperature state. At room temperature, the drive part 32 remains flat; however, at high temperatures, the transition portion between the electrical connection part 321 and the connecting protrusion 322 bends downward, forming a certain angle. This causes the electrical connection part 321 to drive the elastic body 31 to produce a downward displacement with a rightward rotation. Since the elastic body 31 and the trigger rod 21 are in contact and the elastic body 31 has a certain outward preload, the elastic force of the elastic body 31 can give the actuating mechanism 3 a rightward swinging force under the change of contact relationship. This will push the actuating mechanism 3 to swing to the right as a whole. Its downward swinging action will cause the point contact piece to lift up, thereby turning the connection between the electrical connection part and the first conductive part 11 into an open circuit, realizing the overheat protection function.

[0023] To further improve the design, the elastic body 31 has a bent opening 311 at one end near the button 2, which has elastic deformation capability. This opening 311 can expand under pressure and return to its original position after pressure is released. When the button 2 is pressed, the opening 311 expands under the pressure of the trigger rod 21, which overcomes the deformation resistance of the opening 311 and passes through it, thus achieving a reset. A "click" sound can be heard as the trigger rod 21 passes through the opening 311, allowing the user to feel the "click" sound or the change in resistance, resulting in a better operating experience.

[0024] To further improve the design, the end of the trigger rod 21 is provided with a transition surface 211. When the trigger rod 21 contacts the opening 311 provided in the elastic body 31, the transition surface 211 acts as a guide, reducing the resistance required for reset, making it easier for the trigger rod 21 to slide through the opening 311, ensuring smooth operation, avoiding jamming, and ensuring smooth pressing of the button 2.

[0025] Working principle of this utility model

[0026] During installation, the first conductive part 11 and the second conductive part 12 are installed into the placement space, the actuating mechanism 3 is placed into the placement space so that the groove 3221 mates with the mounting protrusion 13, the button 2 is installed and the housing is closed, and the installation is simple and convenient.

[0027] In normal use, pushing button 2 will cause the trigger rod 21 extending from button 2 to swing the elastic body 31, controlling the conduction or disconnection of the first conductive part 11 and the second conductive part 12, thus easily and conveniently switching between the open circuit state and the conduction state.

[0028] When overheat protection occurs, if the temperature rises abnormally due to the environment where the switch is located or the current flowing through it, the drive part 32 made of shape memory metal will deform and, under the elastic force of the elastic body 31, the entire actuation mechanism 3 will swing to the right. While swinging to the right, the elastic body 31 will slide relative to the trigger rod 21 and make the end opening 311 abut against the trigger rod 21, so that the actuation mechanism 3 is stably in the open circuit state on the right side.

[0029] When resetting, push button 2 to make trigger rod 21 swing to the right. The swinging trigger rod 21 will overcome the resistance of the springs on both sides of the opening 311 and you will hear a "click". The trigger rod 21 has completed the reset through the opening 311. Press button 2 again to make it conductive.

[0030] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the design concept of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A safe switch, comprising a housing (1), a button (2) pivotally connected to the top surface of the housing (1), a first conductive part (11), and a second conductive part (12), wherein the housing (1) has a placement space, characterized in that: The lower part of the button (2) extends a trigger rod (21); the housing (1) is fitted with an actuating mechanism (3) and can swing in response to the pressing of the button (2); the actuating mechanism (3) includes an elastic body (31) and a driving part (32), which swings to achieve the connection or disconnection between the first conductive part (11) and the second conductive part (12); the driving part (32) is connected to the housing (1), and its driving part (32) is made of shape memory metal, which bends when heated, driving the elastic body (31) to make the actuating mechanism (3) swing as a whole to achieve the circuit breaking.

2. A safe switch according to claim 1, characterized in that: The elastic body (31) is a bent spring with one end connected to the drive part (32) vertically and the other end abutting against the trigger rod (21); the drive part (32) includes an electrical connection part (321) for electrical connection on the left end and a connection protrusion (322) for rotatable connection with the housing (1) on the right end.

3. A safe switch according to claim 2, characterized in that: The two sides of the connecting protrusion (322) are bent downwards, and a groove (3221) is provided at the bent end. The housing (1) is provided with a corresponding mounting protrusion (13) that matches the groove (3221).

4. A safe switch according to claim 2, characterized in that: Under normal conditions, the electrical connection part (321) and the connecting protrusion (322) of the drive part (32) are on the same horizontal plane; when heated, the transition part between the electrical connection part (321) and the connecting protrusion (322) will bend downward.

5. A safe switch according to claim 4, characterized in that: The elastic body (31) has an opening (311) formed by bending at one end near the button (2), and the opening (311) has elastic deformation capability.

6. A safe switch according to claim 5, characterized in that: The trigger rod (21) has a transition surface (211) at its end.

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