Connection structure of switch elastic sheet and terminal

Abstract

The utility model relates to a connection structure of a switch elastic sheet and a terminal, comprising a terminal and an elastic sheet, the terminal comprises a traction part and a support part, the rear end of the elastic sheet abuts against the support part, the front end of the elastic sheet is used for connecting a moving contact, the elastic sheet is connected with the traction part through a tension spring, and the support part is provided with a groove for the tension spring to pass through. The groove forms an opening at the free end of the supporting part, an embedding groove is formed in the face, abutting against the elastic piece, of the supporting part, the rear end of the elastic piece is inserted into the embedding groove, the two sides of the supporting part are each provided with a limiting groove, the two limiting grooves are located at the two ends of the embedding groove respectively, and the edges of the two sides of the rear end of the elastic piece extend backwards to form limiting pieces respectively. The two limiting pieces are inserted into the two limiting grooves in a one-to-one correspondence mode, the length of the limiting pieces is larger than the distance between the caulking grooves and the edges of the lower sides of the limiting grooves, and the axial movement and the upward swing amplitude of the elastic pieces along the caulking grooves are limited. According to the utility model, the technical problem that the upper swing amplitude limit stability of the elastic sheet is not high can be solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of switches, and in particular relates to a connection structure between a switch spring and a terminal. Background Art

[0002] A microswitch is usually composed of terminals, springs, static contacts, and buttons that are elastically connected to each other. The springs abut against the terminals to form a conduction with the terminals. Pressing the button causes the springs to swing and abut against the static contacts to form a path. For example, in the microswitch disclosed in the utility model patent No. 202020806182.2, entitled "Spring-type microswitch," the springs of conventional microswitches need to be limited in the direction away from the static contacts to prevent the springs from swinging upward excessively and causing the elastic connection between the springs and the terminals to fall apart. This complicates the internal structure of the switch, increases the difficulty of design and product manufacturing, and is not conducive to the further miniaturization of the microswitch.

[0003] In order to solve the above technical problems, the utility model patent with patent number 201520908537.8 and name “Micro switch and drive box” provides another limiting idea. By limiting the upward swing amplitude of the spring connected to the spring, the upward swing amplitude of the spring is limited. Therefore, the terminal structure is improved, and a blocking part is set in the upward swing direction of the spring to block the upward swing of the spring, such as Figure 1 Part A shown in the figure. However, this arrangement has a problem, which is that it increases the difficulty of spring installation, and limiting the upward swing amplitude of the spring by the upward swing amplitude of the spring is an indirect control. When the elasticity of the spring changes, it will also affect the upward swing amplitude of the spring. Therefore, this method has the problem of low stability. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a connection structure between a switch spring and a terminal, simplify the limit structure of the spring upward swing amplitude limit, and solve the technical problem of low stability of the spring upward swing amplitude limit.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a connection structure between a switch spring and a terminal, comprising a terminal and a spring, the terminal comprising a traction part and a support part arranged opposite to each other, the rear end of the spring abuts against the side of the support part facing away from the traction part and the front end of the spring extends in a direction away from the traction part, the front end of the spring is used to connect the moving contact, the spring is connected to the traction part through a tension spring, the support part is provided with a groove for the tension spring to pass through, the groove forms an opening at the free end of the support part, the surface of the support part abutting against the spring is provided with an embedding groove, the rear end of the spring is inserted into the embedding groove, a limiting groove is respectively provided on both sides of the support part, the two limiting grooves are respectively located at both ends of the embedding groove, the two side edges of the rear end of the spring extend backward to form limiting plates, the two limiting plates are inserted into the two limiting grooves one by one, the length of the limiting plate is greater than the distance from the embedding groove to the lower edge of the limiting groove, thereby limiting the axial movement and upward swing amplitude of the spring along the embedding groove.

[0006] As a preferred embodiment, the spring piece is composed of a overlapping portion, an arched portion, an abutting portion and a limiting portion that are connected to each other in sequence from the front end to the rear end, the overlapping portion facing the free end of the terminal support portion is a top surface, and the other surface is a bottom surface, the overlapping portion is used to connect the moving contact and overlap the static contact, the arched portion is arched into an arc toward the free end of the terminal support portion, the rear end of the arched portion extends tangentially backward to form an abutting portion, the rear end of the abutting portion is used to abut in the embedded groove, and the rear ends of the abutting portion extend backward on both sides of the rear end of the abutting portion to form limiting portions, the limiting portion is two limiting pieces, respectively inserted into the two limiting grooves, the middle part of the rear end of the overlapping portion is provided with an avoidance groove extending backward to the end of the spring piece and forming an opening, and a front through hole for connecting the tension spring is provided at the rear end of the overlapping portion near the avoidance groove, the rear end of the abutting portion is located on one side of the bottom surface of the overlapping portion, the abutting portion and the overlapping portion are inclined to each other at an obtuse angle of 120°~150°, and the two limiting pieces are obliquely inserted into the two limiting grooves.

[0007] As a preferred solution, when the spring piece bounces upward to the top dead point, the limiting piece abuts against the edge of the side wall of the limiting groove, and the limiting piece limits the upward swinging range of the spring piece.

[0008] The beneficial effect of the present invention is that the present invention sets the angle between the limiting piece at the tail of the spring piece and the spring piece and cooperates with the limiting groove, so that the limiting piece limits the upward swing amplitude of the spring piece by abutting against the edge of the limiting groove, thereby directly limiting the upward swing amplitude of the spring piece and eliminating the stability problem caused by indirect limitation. There is no need to set an additional limiting structure to limit the upward swing amplitude of the spring piece, which simplifies the limiting structure of the spring piece and provides a technical basis for further miniaturization of the micro switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings, wherein:

[0010] Figure 1This is a schematic diagram of the existing spring upward swing amplitude limiting structure;

[0011] Figure 2 It is a three-dimensional diagram of the connection structure of the utility model;

[0012] Figure 3 This is an exploded view of the specific connection structure between the spring and the support part;

[0013] Figure 4 It is a half-section of the shrapnel;

[0014] Figures 1 to 4 Middle: 1. Terminal; 101. Pulling part; 102. Support part; 2. Spring piece; 201. Overlap part; 202. Arched part; 203. Abutting part; 204. Limiting part; 3. Moving contact; 4. Tension spring; 5. Groove; 6. Embedded groove; 7. Limiting groove; 8. Limiting piece; 9. Avoiding groove; 10. Front through hole. DETAILED DESCRIPTION

[0015] The specific implementation scheme of the present utility model is described in detail below with reference to the accompanying drawings.

[0016] like Figures 2 to 4 As shown, a connection structure between a switch spring and a terminal includes a terminal 1 and a spring 2, wherein the terminal 1 includes a traction portion 101 and a support portion 102 arranged opposite to each other, the rear end of the spring 2 abuts against the side of the support portion 102 facing away from the traction portion 101 and the front end of the spring 2 extends in a direction away from the traction portion 101, the front end of the spring 2 is used to connect the moving contact 3, the spring 2 is connected to the traction portion 101 through a tension spring 4, the support portion 102 is provided with a groove 5 for the tension spring 4 to pass through, and the groove 5 is free in the support portion 102 An opening is formed at the end, and an embedding groove 6 is provided on the surface where the support portion 102 abuts the spring piece 2. The rear end of the spring piece 2 is inserted into the embedding groove 6. A limiting groove 7 is provided on both sides of the support portion 102. The two limiting grooves 7 are respectively located at both ends of the embedding groove 6. The edges on both sides of the rear end of the spring piece 2 extend backward to form a limiting piece 8. The two limiting pieces 8 are inserted into the two limiting grooves 7 in a one-to-one correspondence. The length of the limiting piece is greater than the distance a from the embedding groove 6 to the lower edge of the limiting groove 7, which limits the axial movement and upward swing amplitude of the spring piece 2 along the embedding groove 6.

[0017] In this embodiment, the spring piece 2 is composed of a overlapping portion 201, an arched portion 202, an abutting portion 203 and a limiting portion 204, which are connected to each other in sequence from the front end to the rear end. The side of the overlapping portion 201 facing the free end of the support portion 102 of the terminal 1 is the top surface, and the other side is the bottom surface. The overlapping portion 201 is used to connect the moving contact 3 and overlap with the static contact. The arched portion 202 is arched into an arc shape toward the free end of the support portion 102 of the terminal 2. The rear end of the arched portion 202 extends tangentially backward to form the abutting portion 203. The function of the arched portion 202 is to adjust and extend the length of the abutting portion 203 so that the length of the abutting portion is greater than half the width of the limiting groove 7. In this way, the abutting portion 203 can abut against the side wall of the limiting groove 7 away from the traction portion 101 when the spring piece 2 swings upward, and can also limit the upward swing amplitude of the spring piece 2.

[0018] The rear end of the abutting portion 203 is used to abut against the embedded groove 6, and the two sides of the rear end of the abutting portion 203 extend backward to form a limiting portion 204. The limiting portion 204 is two limiting pieces 8, which are respectively inserted into the two limiting grooves 7. The middle part of the rear end of the overlapping portion 201 is provided with an avoidance groove 9 extending backward to the end of the spring 2 and forming an opening, which is used to avoid the main part of the tension spring 4. The rear end of the overlapping portion 201 is provided with a front through hole 10 for connecting the tension spring 4 near the avoidance groove 9. The rear end of the abutting portion 203 is located on one side of the bottom surface of the overlapping portion 201. The angle α formed by the mutual inclination of the abutting portion 203 and the overlapping portion 201 is an obtuse angle of 120°~150°, and the two limiting pieces 8 are obliquely inserted into the two limiting grooves 7.

[0019] In this embodiment, when the spring piece 2 bounces upward to the top dead point, the limiting piece 8 abuts against the edge of the side wall of the limiting groove 7, and the limiting piece 8 limits the upward swing range of the spring piece 2.

[0020] The working process of this utility model is: Figures 2 to 4 As shown, first, the connection structure between the switch spring and the terminal of the utility model is pressed Figure 2 Assemble as shown. During use, when the user applies downward pressure to the tension spring 4 between the traction portion 101 and the support portion 102, the end of the tension spring 4 connected to the spring plate 2 swings downward, driving the spring plate 2 to swing downward with the embedded groove 6 as a fulcrum. The moving contact 3 on the spring plate 2 moves downward to approach the static contact (not shown) until it abuts the static contact, and the switch is closed. When the user removes the downward pressure, the tension spring 4 swings upward under its own tension, driving the spring plate 2 to swing upward and separate from the static contact. The spring plate 2 swings further upward, and the limiting plate 8 swings downward in the limiting groove 7. When the limiting plate 8 swings downward until it abuts the edge of the limiting groove 7 near the traction portion 101, the spring plate 2 is restricted from swinging further upward, remains in the raised state, and is separated from the static contact.

[0021] The above embodiments are merely illustrative of the principles and effects of the present invention, as well as some embodiments of its application, and are not intended to limit the present invention. It should be noted that a person skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A connection structure between a switch spring and a terminal, comprising a terminal and a spring, wherein the terminal comprises a pulling portion and a supporting portion arranged opposite to each other, the rear end of the spring abutting against a side of the supporting portion facing away from the pulling portion and the front end of the spring extending in a direction away from the pulling portion, the front end of the spring being used to connect to a moving contact, the spring being connected to the pulling portion via a tension spring, characterized in that: The support part is provided with a groove for the tension spring to pass through, and the groove forms an opening at the free end of the support part. The surface of the support part that abuts the spring sheet is provided with an embedding groove, and the rear end of the spring sheet is inserted into the embedding groove. A limiting groove is provided on both sides of the support part, and the two limiting grooves are respectively located at the two ends of the embedding groove. The edges on both sides of the rear end of the spring sheet extend backward to form limiting plates, and the two limiting plates are inserted into the two limiting grooves one by one. The length of the limiting plate is greater than the distance from the embedding groove to the lower edge of the limiting groove, thereby limiting the axial movement and upward swing amplitude of the spring sheet along the embedding groove.

2. The connection structure between the switch spring and the terminal according to claim 1, characterized in that: The spring piece is composed of a overlapping portion, an arched portion, a butt portion and a limiting portion which are connected to each other in sequence from the front end to the rear end, the overlapping portion facing the free end of the terminal support portion is a top surface, and the other surface is a bottom surface, the overlapping portion is used to connect the moving contact and overlap the static contact, the arched portion is arched into an arc toward the free end of the terminal support portion, the rear end of the arched portion extends tangentially backward to form an abutment portion, the rear end of the abutment portion is used to abut in the embedding groove, and the rear ends of the abutment portion extend backward on both sides of the rear end of the abutment portion to form limiting portions, the limiting portion is composed of two limiting pieces, which are respectively inserted into the two limiting grooves, and the middle part of the rear end of the overlapping portion is provided with an avoidance groove extending backward to the end of the spring piece and forming an opening, and a front through hole for connecting the tension spring is provided at the rear end of the overlapping portion near the avoidance groove. The rear end of the abutment portion is located on one side of the bottom surface of the overlapping portion, the abutment portion and the overlapping portion are inclined to each other at an obtuse angle of 120°~150°, and the two limiting pieces are obliquely inserted into the two limiting grooves.

3. The connection structure between the switch spring and the terminal according to claim 2, characterized in that: When the spring piece bounces upward to the top dead point, the limiting piece abuts against the edge of the side wall of the limiting groove, and the limiting piece limits the upward swinging range of the spring piece.

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