A micro switch

Abstract

This utility model discloses a micro switch, including a main body with a receiving cavity, in which a moving contact and a stationary contact are disposed. It also includes a triggering assembly for triggering the movement of the moving contact. The triggering assembly includes an elastic connector, a contact rod, a trigger plate, and a hinge. The contact rod and the trigger plate are respectively assembled at both ends of the connector, forming a lever structure. The hinge is rotatably configured and connects the moving contact and the trigger plate. Through the cooperation of the lever structure, when the contact rod is subjected to an action force, the contact rod drives the connector to undergo a slight deformation, which in turn drives the trigger plate to rotate. The trigger plate triggers the hinge to rotate, thereby causing the moving contact to abut against or move away from the stationary contact. This achieves the triggering of the switch by the micro-movement of the contact rod, based on the principle of amplifying the triggering stroke using a lever structure. It can also replace the existing plunger structure and achieve rapid triggering.

Description

Technical Field

[0001] This utility model relates to the field of switch technology, and in particular to a micro switch. Background Technology

[0002] A micro switch is a pressure-activated, fast-changeover switch. It is named a micro switch because of its small contact spacing, and is also known as a flexible switch.

[0003] Existing microswitches typically have a plunger (i.e., a contact rod) that acts directly on the moving contact of the switch. By pressing the plunger, the moving contact and the U-shaped spring are deformed to trigger and reset the switch. However, the operating stroke and reset accuracy of the switch mainly depend on the operating stroke of the plunger, resulting in an excessively long triggering cycle. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a micro switch that amplifies the trigger stroke based on a lever structure, enabling rapid triggering by micro-movement of the contact rod to drive the switch.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0006] This utility model provides a micro switch, including a main body with a receiving cavity, in which a moving contact and a stationary contact are disposed, and a triggering assembly for triggering the movement of the moving contact. The triggering assembly includes an elastic connector, a contact rod disposed outside the receiving cavity, and a trigger plate and a hinge disposed inside the receiving cavity. The connector is assembled to the wall of the receiving cavity, and the contact rod and the trigger plate are respectively assembled to the two ends of the connector located inside and outside the receiving cavity, forming a lever structure for amplifying the triggering stroke. The hinge is rotatably disposed and connects the moving contact and the trigger plate. The contact rod is used to drive the connector to undergo slight deformation and drive the trigger plate to rotate. The trigger plate is used to trigger the hinge to rotate, so that the moving contact abuts against or moves away from the stationary contact, thereby forming a switch.

[0007] Furthermore, the connector is a bowl-shaped metal part with a through hole that connects to the receiving cavity. A connecting shaft passes through the through hole, and the two ends of the connecting shaft located inside and outside the receiving cavity are respectively fixedly connected to the contact rod and the trigger plate.

[0008] Furthermore, one end of the contact rod and one end of the trigger plate are respectively fixed to the two axial ends of the connecting shaft by welding, and the contact rod and the trigger plate are respectively spaced apart from the wall of the receiving cavity; the end of the trigger plate facing away from the connecting shaft is insulated and abuts against the hinge; the connecting shaft is fixed to the wall of the through hole by welding.

[0009] Furthermore, a bracket is provided inside the receiving cavity, and the hinge is rotatably connected to the bracket. The end of the hinge away from the bracket is connected to the movable contact piece. An elastic reset member is provided between the bracket and the movable contact piece and is used to reset the movable contact piece.

[0010] Furthermore, the elastic reset element is a U-shaped spring.

[0011] Furthermore, the main body includes a first terminal, a second terminal, and a third terminal. The bracket is assembled to the first terminal and forms an electrical connection. The bracket and the moving contact are electrically connected through the hinge. The stationary contact is electrically connected to the third terminal. The moving contact moves away from the stationary contact with the cooperation of the triggering component until it abuts against the second terminal and forms an electrical connection. The moving contact abuts against the stationary contact and forms an electrical connection only when restricted by the elastic reset component.

[0012] Furthermore, the main body also includes a housing and a terminal block. The housing includes an outer shell and an upper cover and a bottom cover fitted into openings on both sides of the outer shell. The terminal block is inserted into the outer shell, and the terminal block, the upper cover, and the outer shell together form the receiving cavity. The upper cover has welding holes, and the connector is fixedly connected to the welding holes by welding. The first terminal, the second terminal, and the third terminal are respectively fitted into the terminal block.

[0013] Furthermore, the housing is a metal housing.

[0014] Furthermore, an insulating colloid is filled between the bottom cover and the terminal block.

[0015] Furthermore, the terminal block and the housing are positioned relative to each other by limiting posts and limiting holes.

[0016] The technical solution provided by this utility model has the following beneficial effects:

[0017] The connector, the contact rod, the trigger plate, and the hinge together form a lever structure for amplifying the trigger action stroke. When the contact rod is subjected to an action force, it drives the connector to undergo a slight deformation, which in turn drives the trigger plate to rotate. The trigger plate then triggers the hinge to rotate, causing the moving contact piece to abut against or move away from the stationary contact piece. This leverages the principle of amplifying the trigger action stroke to enable the switch to be triggered by the slight movement of the contact rod. It can also replace the plunger structure of the prior art and achieve rapid triggering. Attached Figure Description

[0018] Figure 1The image shown is an external view of the micro switch in the embodiment;

[0019] Figure 2 The diagram shown is an exploded view of the micro switch in the embodiment.

[0020] Figure 3 The figure shown is a cross-sectional view of the micro switch when the contact rod is triggered in the embodiment;

[0021] Figure 4 The figure shown is a cross-sectional view of the micro switch when the contact rod is not triggered in the embodiment;

[0022] Figure 5 The diagram shown is a schematic of the upper cover assembly in the embodiment;

[0023] Figure 6 The diagram shown is a schematic of the terminal block assembly in the embodiment. Detailed Implementation

[0024] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention and are mainly used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. The components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0025] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0026] Reference Figures 1 to 6 This embodiment provides a micro switch, including a main body with a receiving cavity 301. The receiving cavity 301 is provided with a cooperating moving contact 10 and a stationary contact 9, which are arranged in an upper and lower position, respectively.

[0027] like Figure 2 and Figure 3 As shown, the micro switch in this embodiment also includes a trigger assembly 400 for triggering the movement of the moving contact 10. Specifically, the trigger assembly 400 includes an elastic connector 4, a contact rod 1 disposed outside the receiving cavity 301, and a trigger plate 5 and a hinge 14 disposed inside the receiving cavity 301. The connector 4 is assembled to the upper wall of the receiving cavity 301. The contact rod 1 and the trigger plate 5 are respectively assembled to the upper and lower ends of the connector 4 located inside and outside the receiving cavity 301, forming a lever structure for amplifying the trigger action stroke. Specifically, the connector 4 has a through hole 41 communicating with the receiving cavity 301. A connecting shaft 2 passes through the through hole 41 and is fixedly connected to each other. The upper and lower ends of the connecting shaft 2 located inside and outside the receiving cavity 301 are respectively fixedly connected to the contact rod 1 and the trigger plate 5.

[0028] The hinge component 14 is rotatable and is connected to the moving contact piece 10 and the trigger plate 5 respectively.

[0029] The contact rod 1 is used to drive the connector 4 to undergo slight deformation, which in turn drives the trigger plate 5 to rotate. The trigger plate 5 is used to trigger the hinge 14 to rotate, so that the moving contact 10 abuts against the stationary contact 9 and is electrically connected to it, thereby forming a switch. Of course, in other embodiments, the moving contact 10 can also be triggered away from the stationary contact 9 by the trigger assembly 400.

[0030] Furthermore, the main body of this embodiment includes a housing 300, a terminal block 12, a first terminal block 16 (i.e., the first electrical connection terminal of the micro switch), a second terminal block 17 (i.e., the second electrical connection terminal of the micro switch), and a third terminal block 18 (i.e., the third electrical connection terminal of the micro switch). At this time, the first terminal block 16, the second terminal block 17, and the third terminal block 18 are arranged in a row from left to right with a spacing between them, and are respectively assembled on the terminal block 12.

[0031] A bracket 11 is provided inside the receiving cavity 301. The bracket 11 is sleeved on the first terminal 16 and electrically connected. The left end of the hinge 14 is rotatably connected to the bracket 11. The right end of the hinge 14 away from the bracket 11 is connected to the left end of the moving contact 10. An elastic reset element is provided between the bracket 11 and the moving contact 10. Specifically, the elastic reset element is a U-shaped spring 8. The left end of the U-shaped spring 8 is inserted into a pre-set V-shaped slot in the bracket 11. The right end of the U-shaped spring 8 is connected to the moving contact 10 so that the moving contact 10 can be reset when the contact rod 1 is no longer subjected to the action force, that is, to ensure that the moving contact 10 is away from the second terminal 17 until it abuts against the stationary contact 9, so as to electrically connect the first terminal 16 and the third terminal 18.

[0032] In this embodiment, the bracket 11 and the moving contact 10 are electrically connected through the hinge 14. The bracket 11 is electrically connected to the first terminal 16. Therefore, the moving contact 10 is always electrically connected to the first terminal 16 in this embodiment. The right end of the stationary contact 9 is sleeved on the third terminal 18 and electrically connected. The right end of the moving contact 10 (i.e., the moving contact) corresponds to the left end of the stationary contact 9 (i.e., the stationary contact).

[0033] like Figure 3 As shown, when an actuating force is applied to the contact rod 1 of the micro switch (i.e., the contact rod 1 is triggered), the contact rod 1 forces the connecting member 4 to deform through the connecting shaft 2, which simultaneously drives the trigger plate 5 to rotate downwards and presses the right end of the hinge member 14 to rotate downwards. Under the premise of overcoming the elasticity limitation of the U-shaped spring 8, the moving contact piece 10 is driven to move downwards. At this time, the moving contact piece 10 moves away from the stationary contact piece 9 with the cooperation of the trigger assembly 400 until it abuts against the second terminal 17 located below and forms an electrical connection. At the same time, the electrical connection between the first terminal 16 and the third terminal 18 is broken.

[0034] like Figure 4 As shown, when the action force is removed (i.e., the contact rod 1 is in an untriggered state), the trigger assembly 400 no longer drives the hinge 14 to rotate downward, and the moving contact 10 moves upward only under the elastic force of the U-shaped spring 8 itself, until it abuts the stationary contact 9 and forms an electrical connection. At this time, the first terminal 16 and the third terminal 18 are electrically connected to each other.

[0035] The connecting member 4, the contact rod 1, the trigger plate 5, and the hinge member 14 together form a lever structure for amplifying the trigger action stroke. When the contact rod 1 is subjected to an action force, the contact rod 1 drives the connecting member 4 to undergo a slight deformation, which in turn drives the trigger plate 5 to rotate. The trigger plate 5 then triggers the hinge member 14 to rotate, thereby causing the moving contact piece 10 to abut against or move away from the stationary contact piece 9. In this way, based on the principle of amplifying the trigger action stroke using a lever structure, the micro-movement of the contact rod 1 can drive the switch to be triggered. It can also replace the plunger structure of the existing technology and achieve rapid triggering.

[0036] In another preferred embodiment, such as Figure 2 As shown, connector 4 is a bowl-shaped metal part, and the contact rod 1, trigger plate 5, and connecting shaft 2 are also made of conductive metal. Of course, in other embodiments, connector 4 can also be a circular, elliptical, or other square metal sheet.

[0037] In this specific embodiment, the connecting shaft 2 is fixed to the wall of the through hole 41 by welding, and the right ends of the contact rod 1 and the trigger plate 5 are fixed to the upper and lower axial ends of the connecting shaft 2 by welding, respectively. The contact rod 1 and the trigger plate 5 are respectively spaced apart from the upper wall of the receiving cavity 301, thus forming the lever structure of this embodiment.

[0038] The trigger plate 5 is insulated from the right end of the connecting shaft 2 and abuts against the left end of the hinge member 14. Specifically, an insulating sheet 6 is provided between the trigger plate 5 and the hinge member 14 to ensure that they are insulated from each other.

[0039] More preferably, the housing 300 is a metal housing, thus ensuring that the micro switch of this embodiment can withstand frequent impacts from high and low temperature differences.

[0040] More specifically, such as Figure 1 and Figure 2 As shown, the housing 300 includes an outer shell 7 and an upper cover 3 and a bottom cover 13 fitted onto the openings on the upper and lower sides of the outer shell 7.

[0041] like Figure 3 As shown, the terminal block 12 is inserted into the housing 7, and the terminal block 12, the upper cover 3 and the housing 7 together form a receiving cavity 301. At this time, the upper wall of the receiving cavity 301 is the upper cover 3, and the bottom cover 13 and the terminal block 12 are filled with insulating glue 19 to ensure the overall insulation and sealing of the micro switch.

[0042] During installation, the upper cover 3 has welding holes 31. The connector 4 is fixed to the welding holes 31 by welding, forming a support point for the lever structure. At this time, the contact rod 1, connecting shaft 2, connector 4, and trigger plate 5 equipped with insulating sheet 6 are all installed on the upper cover 3, forming a structure like... Figure 5 The top cover assembly 100 is shown, and then the top cover assembly 100 is assembled as a whole into the upper opening of the outer casing 7.

[0043] In addition, the first terminal 16, the second terminal 17, the third terminal 18, the bracket 11, the hinge 14, the U-shaped spring 8, the moving contact 10, and the stationary contact 9 are respectively assembled on the terminal block 12, forming a shape as shown in the figure. Figure 6 The terminal block assembly 200 is shown.

[0044] like Figure 1 As shown, when the terminal block assembly 200 needs to be assembled inside the housing 7, the terminal block assembly 200 and the housing 7 are positioned relative to each other by the limiting post 15 and the limiting hole 71. Then, the bottom cover 13 is installed in the lower opening of the housing 7, and finally, glue is applied to complete the installation of the micro switch.

[0045] In summary, the micro switch in this embodiment is a micro metal switch with advantages such as high precision, large temperature difference, and full sealing.

[0046] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims, and all such changes shall be within the scope of protection of the present invention.

Claims

1. A micro switch, comprising a body having a receiving cavity, wherein a mating moving contact and a stationary contact are disposed within the receiving cavity, characterized in that: It also includes a triggering component for triggering the movement of the moving contact piece; The triggering assembly includes a flexible connector, a contact rod disposed outside the receiving cavity, and a trigger plate and a hinge disposed inside the receiving cavity; The connector is assembled to the wall of the receiving cavity, and the contact rod and the trigger plate are respectively assembled to the two ends of the connector located inside and outside the receiving cavity, forming a lever structure for amplifying the trigger action stroke; The hinge component is rotatably configured and connects the moving contact piece and the trigger plate respectively; the contact rod is used to drive the connecting piece to undergo slight deformation and drive the trigger plate to rotate; the trigger plate is used to trigger the hinge component to rotate, so as to drive the moving contact piece to abut against or move away from the stationary contact piece, thereby forming a switch.

2. The micro switch according to claim 1, characterized in that: The connector is a bowl-shaped metal part with a through hole that connects to the receiving cavity. A connecting shaft passes through the through hole, and the two ends of the connecting shaft located inside and outside the receiving cavity are respectively fixedly connected to the contact rod and the trigger plate.

3. The micro switch according to claim 2, characterized in that: One end of the contact rod and one end of the trigger plate are respectively fixed to the two axial ends of the connecting shaft by welding, and the contact rod and the trigger plate are respectively spaced apart from the wall of the receiving cavity; the end of the trigger plate opposite to the connecting shaft is insulated and abuts against the hinge; the connecting shaft is fixed to the wall of the through hole by welding.

4. The micro switch according to claim 3, characterized in that: A bracket is provided inside the receiving cavity, and the hinge is rotatably connected to the bracket. The end of the hinge away from the bracket is connected to the movable contact piece. An elastic reset member is provided between the bracket and the movable contact piece and is used to reset the movable contact piece.

5. The micro switch according to claim 4, characterized in that: The elastic reset element is a U-shaped spring.

6. The micro switch according to claim 5, characterized in that: The main body includes a first terminal, a second terminal, and a third terminal. The bracket is assembled to the first terminal and forms an electrical connection. The bracket and the moving contact are electrically connected through the hinge. The stationary contact is electrically connected to the third terminal. The moving contact moves away from the stationary contact with the cooperation of the triggering component until it abuts against the second terminal and forms an electrical connection. The moving contact abuts against the stationary contact and forms an electrical connection only when restricted by the elastic reset component.

7. The micro switch according to claim 6, characterized in that: The main body also includes a housing and a terminal block. The housing includes an outer shell and an upper cover and a bottom cover fitted into openings on both sides of the outer shell. The terminal block is inserted into the outer shell, and the terminal block, the upper cover, and the outer shell together form the receiving cavity. The upper cover has welding holes, and the connector is fixedly connected to the welding holes by welding. The first terminal, the second terminal, and the third terminal are respectively fitted into the terminal block.

8. The micro switch according to claim 7, characterized in that: The casing is a metal casing.

9. The micro switch according to claim 8, characterized in that: An insulating colloid is filled between the bottom cover and the terminal block.

10. The micro switch according to claim 7, characterized in that: The terminal block and the housing are positioned relative to each other by limiting posts and limiting holes.

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