Microswitch

Abstract

A microswitch, comprising a shell (1), a pressing block (2) arranged at the top end of the shell (1), a reset member for resetting the pressing block (2), and a circuit board (3) arranged on the bottom wall of the shell (1), wherein the pressing block (2) passes through the top wall of the shell (1), and the pressing block (2) partially protrudes from the top wall of the shell (1) and is partially located in the shell (1); an abutting block (4) is provided on the side wall of the pressing block (2); a movable contact piece (5) is provided in the shell (1); one end of the movable contact piece (5) is connected to the circuit board (3), an extension piece (6) is provided at the other end of the movable contact piece (5), and a stationary contact piece (7) is provided on the bottom wall of the shell (1); a guide piece (8) is provided below the extension piece (6), and the guide piece (8) extends from the end of the extension piece (6) towards the side away from the abutting block (4); and an elastic member is provided on the side of the movable contact piece (5) away from the stationary contact piece (7). The microswitch enables the conversion of a rigid contact between the movable contact piece (5) and the stationary contact piece (7) into a transmission-type elastic contact, and the acting force from the elastic member can buffer the pressure generated when a user presses vigorously, thereby reducing the wear caused by rigid impact between the movable contact piece (5) and the stationary contact piece (7).

Description

A micro switch Technical Field

[0001] The utility model relates to the field of electronic switches, in particular to a micro switch. Background Art

[0002] A micro switch is a switch with a small contact spacing and a snap-action mechanism. It uses a specified stroke and a specified force to perform a switching action. It is covered with a shell and has a driving rod on the outside. Because the contact spacing of the switch is relatively small, it is called a micro switch, also known as a sensitive switch.

[0003] The contact mechanism of a micro switch usually serves as the starting point of signal input. By pressing the key, the contact piece at the bottom of the key contacts the contact static piece inside the micro switch to generate an electrical signal. However, when the user presses hard for a long time, the contact moving piece or the contact static piece is prone to collide with each other and deform, which may lead to poor contact later. Utility Model Content

[0004] In order to reduce the damage caused by the impact of a metal sheet in a micro switch due to a strong downward pressure and to increase the service life of the micro switch, the utility model provides a micro switch.

[0005] The micro switch provided by the utility model adopts the following technical solution:

[0006] A micro switch includes a housing, a pressing block provided at the top of the housing, a reset member for resetting the pressing block, and a circuit board provided at the bottom wall of the housing, wherein the pressing block extends through the top wall of the housing, partially protruding from the top wall of the housing and partially located inside the housing, a pressing block provided on a side wall of the pressing block, a contact movable piece provided within the housing, one end of the contact movable piece being connected to the circuit board, the other end of the contact movable piece being provided with an extension piece, and a contact static piece provided on the bottom wall of the housing;

[0007] A guide piece is provided under the extension piece, and the guide piece extends from the end of the extension piece toward the side away from the pressing block, and an elastic member is provided on the side of the contact movable piece away from the contact static piece; when the pressing block is pressed, the pressing block is staggered from the extension piece in the horizontal direction, and the contact movable piece and the contact static piece are in contact; when the pressing block is reset, the pressing blocks are opposite in the horizontal direction and the ends are pressed against each other, the elastic member is in a compressed state, and the contact movable piece is separated from the contact static piece.

[0008] Preferably, the guide piece, the extension piece and the contact movable piece are integrally connected, the connection between the guide piece and the extension piece is an arc transition, and the connection between the extension piece and the contact movable piece is an arc transition.

[0009] Preferably, the elastic member includes an arc-shaped transition piece and a connecting piece integrally connected to the contact movable piece, the contact movable piece and the connecting piece are both perpendicular to the bottom of the micro switch, the top of the connecting piece is connected to the top of the contact movable piece through the arc-shaped transition piece, the arc segment of the arc-shaped transition piece is pressed against the inner wall of the shell and is deformed by the squeezing of the inner wall of the shell, and the connecting piece is fixedly connected to the pin.

[0010] Preferably, a protrusion is provided at the bottom of the inner wall of the shell, and the protrusion is provided with a driving piece, one end of the driving piece is fixed to the protrusion and is conductively connected to the contact static piece, the circuit board is electrically connected with a protrusion, the end of the driving piece away from the contact static piece is opposite to the protrusion, and the side of the driving piece close to the top of the shell abuts against the bottom of the pressing block; when the pressing block slides down, the end of the driving piece away from the contact static piece abuts against the protrusion, and when the pressing block slides up, the end of the driving piece away from the contact static piece is separated from the protrusion.

[0011] Preferably, the driving plate is penetrated by an avoidance hole, the driving plate is sleeved on the protrusion through the avoidance hole, the driving plate is integrally connected with the contact static plate, and the contact static plate is fitted and fixed on the vertical side wall of one side of the protrusion.

[0012] Preferably, a protruding metal block is provided on each side of the contact static piece and the contact dynamic piece that are close to each other, and the two metal blocks are facing each other.

[0013] Preferably, the reset member includes a spring sheet arranged at the bottom of the driving plate, the spring sheet is an arc-shaped sheet, a boss is provided inside the shell, the boss is arranged below the spring sheet, one end of the spring sheet is fixedly connected to the driving plate, and the other end is fixedly connected to the inner wall of the shell. When the pressing block slides down, the spring sheet is deformed by force.

[0014] Preferably, the heights of the two ends of the spring sheet from the boss are higher than the height of the bottom end from the boss, and the spring sheet is arranged between the raised portion and the bump.

[0015] Preferably, a first guide channel and a second guide channel are passed through the top of the shell, the pressing block passes through the first guide channel, a plurality of the tightening blocks are provided, and a plurality of the second guide channels are provided corresponding to the number of the tightening blocks, and the plurality of the tightening blocks slide in the plurality of second guide channels respectively.

[0016] Preferably, the pressing block is arranged close to the driving plate, the top end of the pressing block is an inclined surface, and the inclined upper end of the inclined surface is arranged close to the pressing block.

[0017] In summary, the present invention has the following beneficial technical effects: when the pressing block is pressed, the pressing block slides down, thereby causing the abutting block to slide down and stagger with the extension piece, and the obstruction of the extension piece by the abutting block disappears, so that the extension piece moves toward the direction close to the contact static piece under the action of the elastic member, so that the contact movable piece connected to the extension piece is driven to move toward the contact static piece, and the contact movable piece and the contact static piece are in contact and conductive. When the pressing block is released, the pressing block rises, driving the abutting block to slide up. When the abutting block slides up, the end of the abutting block abuts against the guide piece, thereby pushing the guide piece to slide, and then pushing the extension piece to drive the contact movable piece to move in the direction away from the contact static piece. When the abutting block returns to a state of facing and abutting with the end of the extension piece, the contact movable piece is pushed to separate from the contact static piece, thereby disconnecting the circuit. Through the cooperation of the tightening block, the extension piece and the elastic piece, the hard contact between the contact moving piece and the contact static piece is converted into a transmission-type elastic contact. The force of the elastic piece can buffer the pressure generated when the user presses down hard, reduce the wear caused by the hard impact between the contact moving piece and the contact static piece, and help to increase the service life of the micro switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] FIG1 is a schematic diagram of the overall structure of a micro switch of the present invention.

[0019] FIG2 is a schematic diagram of the internal structure of a micro switch of the present invention.

[0020] FIG3 is a schematic structural diagram of portion A in FIG2 .

[0021] Explanation of the accompanying reference numerals: 1. Housing; 2. Pressing block; 3. Circuit board; 4. Pressing block; 5. Contact moving plate; 6. Extension plate; 7. Contact static plate; 8. Guide plate; 9. Arc-shaped transition plate; 10. Connecting plate; 11. Pin; 12. Bump; 13. Drive plate; 14. Raised portion; 15. Avoidance hole; 16. Metal block; 17. Spring piece; 18. Boss; 19. First guide channel; 20. Second guide channel; 21. Inclined surface. DETAILED DESCRIPTION

[0022] The present invention will be further described in detail below with reference to Figures 1-3.

[0023] The embodiment of the utility model discloses a micro switch.

[0024] 1-3 , a micro switch includes a housing 1, a pressing block 2 provided at the top of the housing 1, a reset member for resetting the pressing block 2, and a circuit board 3 provided on the bottom wall of the housing 1. The pressing block 2 passes through the top wall of the housing 1, partially protruding from the top wall of the housing 1 and partially located inside the housing 1. A pressing block 4 is provided on the side wall of the pressing block 2. A contact movable piece 5 is provided inside the housing 1. One end of the contact movable piece 5 is connected to the circuit board 3, and the other end of the contact movable piece 5 is provided with an extension piece 6. A contact static piece 7 is provided on the bottom wall of the housing 1.

[0025] A guide piece 8 is provided under the extension piece 6, and the guide piece 8 extends from the end of the extension piece 6 toward the side away from the pressing block 4, and an elastic member is provided on the side of the contact movable piece 5 away from the contact static piece 7; when the pressing block 2 is pressed, the pressing block 4 is staggered with the extension piece 6 in the horizontal direction, and the contact movable piece 5 is in contact with the contact static piece 7; when the pressing block 2 is reset, the pressing block 4 is facing each other in the horizontal direction and the ends are pressed against each other, the elastic member is in a compressed state, and the contact movable piece 5 is separated from the contact static piece 7.

[0026] When the pressing block 2 is pressed, it slides down, causing the abutting block 4 to slide down and stagger with the extension piece 6. The obstruction of the extension piece 6 by the abutting block 4 disappears, causing the extension piece 6 to move in a direction close to the contact static piece 7 under the action of the elastic member, so that the contact movable piece 5 connected to the extension piece 6 is driven to move toward the contact static piece 7, and the contact movable piece 5 and the contact static piece 7 are in contact and conductive. When the pressing block 2 is released, the pressing block 2 rises, driving the abutting block 4 to slide up. When the abutting block 4 slides up, the end of the abutting block 4 abuts against the guide piece 8, thereby pushing the guide piece 8 to slide, and then pushing the extension piece 6 to drive the contact movable piece 5 in a direction away from the contact static piece 7. When the abutting block 4 returns to a state of facing and abutting the end of the extension piece 6, it pushes the contact movable piece 5 to separate from the contact static piece 7, thereby disconnecting the circuit. Through the cooperation of the pressing block 4, the extension piece 6 and the elastic piece, the hard contact between the contact movable piece 5 and the contact static piece 7 is converted into a transmission-type elastic contact. The force of the elastic member can buffer the pressure generated when the user presses down hard, reduce the wear caused by the hard impact between the contact movable piece 5 and the contact static piece 7, and help to improve the service life of the micro switch.

[0027] 2 and 3 , in this embodiment, the guide piece 8 , the extension piece 6 and the contact movable piece 5 are integrally connected, the connection between the guide piece 8 and the extension piece 6 is an arc transition, and the connection between the extension piece 6 and the contact movable piece 5 is an arc transition.

[0028] The guide piece 8, extension piece 6 and contact moving piece 5 are metal pieces connected as one body, and the metal piece has good ductility. By extending and bending the metal piece, it is formed into a three-section integrated metal piece, which reduces the process trouble caused by the mutual fixation of the guide piece 8, extension piece 6 and contact moving piece 5, making the micro switch as a whole easier to process and assemble. At the same time, the setting of the arc transition makes the connection between the guide piece 8, extension piece 6 and contact moving piece 5 less likely to break, which is beneficial to improving the service life of the overall structure of the contact moving piece 5.

[0029] 2 and 3 , in this embodiment, the elastic member includes an arcuate transition piece 9 and a connecting piece 10 integrally connected to the contact movable piece 5. The contact movable piece 5 and the connecting piece 10 are both perpendicular to the bottom of the micro switch. The top of the connecting piece 10 is connected to the top of the contact movable piece 5 through the arcuate transition piece 9. The arc segment of the arcuate transition piece 9 is pressed against the inner wall of the housing 1 and is deformed by the compression of the inner wall of the housing 1. The connecting piece 10 is fixedly connected to the pin 11.

[0030] The connecting piece 10 and the arc-shaped transition piece 9 cooperate to connect the contact movable piece 5 and the pin 11. At the same time, the arc-shaped transition piece 9 can buffer the impact on the contact movable piece 5, making the contact movable piece 5 less likely to be damaged by impact. The arc-shaped transition piece 9 is fixed to the top of the contact movable piece 5, which helps to increase the elastic torque of the contact movable piece 5, thereby reducing the elastic resistance experienced by the contact movable piece 5, and further protecting the contact movable piece 5. At the same time, it can reduce the reaction force experienced by the connecting piece 10, making the connection between the connecting piece 10 and the pin 11 less likely to be disconnected, which helps to increase the overall service life of the micro switch.

[0031] 2 and 3 , in the present embodiment, a protrusion 12 is provided at the bottom of the inner wall of the housing 1, and the protrusion 12 is provided with a driving piece 13. One end of the driving piece 13 is fixed to the protrusion 12 and is conductively connected to the contact static piece 7. The circuit board 3 is electrically connected with a protrusion 14. The end of the driving piece 13 away from the contact static piece 7 is directly opposite to the protrusion 14, and the side of the driving piece 13 close to the top of the housing 1 abuts against the bottom of the pressing block 2; when the pressing block 2 slides down, the end of the driving piece 13 away from the contact static piece 7 abuts against the protrusion 14, and when the pressing block 2 slides up, the end of the driving piece 13 away from the contact static piece 7 is separated from the protrusion 14.

[0032] When the pressing block 2 is not subjected to pressing force, the driving piece 13 is in the initial position, and the end of the driving piece 13 away from the contact static piece 7 is separated from the protrusion 14. When the pressing block 2 is subjected to downward pressure, the driving piece 13 is pushed and rotated by the pressing block 2, so that the end of the driving piece 13 away from the contact static piece 7 moves to abut against the protrusion 14, so that the contact static piece 7 is connected to the circuit board 3 through the driving piece 13, forming a complete circuit of circuit board 3-protrusion 14-driving piece 13-contact static piece 7-contact moving piece 5-pin 11-circuit board 3.

[0033] 2 and 3 , in this embodiment, the drive plate 13 is penetrated by an avoidance hole 15 , and the drive plate 13 is sleeved on the protrusion 12 through the avoidance hole 15 . The drive plate 13 is integrally connected to the contact static plate 7 , and the contact static plate 7 is fixed on the vertical side wall on one side of the protrusion 12 .

[0034] The driver plate 13 is secured to the bump 12 by the contact and static plate 7. Therefore, the driver plate 13 can be installed and set up simultaneously with the contact and static plate 7, making assembly of the microswitch's internal structure more convenient and quick. Furthermore, by utilizing the metallic properties of the contact and static plate 7, the connection between the contact and static plate 7 and the driver plate 13 allows the driver plate 13 to deform and recover, reducing the process required for fixing and conducting the device, and simplifying the microswitch's internal structure.

[0035] 2 and 3 , in this embodiment, a protruding metal block 16 is provided on each side of the contact static piece 7 and the contact dynamic piece 5 that are close to each other, and the two metal blocks 16 are facing each other.

[0036] When the movable contact piece 5 and the static contact piece 7 approach each other, the abutment of the two metal blocks 16 helps reduce the distance that the movable contact piece 5 needs to move, and helps reduce the distance that the pressing block 2 needs to slide down, thereby shortening the pressing distance for the user, which helps improve the feel of use. At the same time, the provision of the two metal blocks 16 helps increase the distance between the static contact piece 7 and the side wall of the movable contact piece 5 when the static contact piece 7 and the movable contact piece 5 contact each other, which helps reduce the possibility of short circuits caused by the abutment of the movable contact piece 5 and the end of the driving piece 13, and helps improve the stability of the overall operation.

[0037] 2 and 3 , in this embodiment, the reset member includes a spring piece 17 provided at the bottom of the driving piece 13 , the spring piece 17 is an arc-shaped piece, a boss 18 is provided inside the housing 1 , the boss 18 is provided below the spring piece 17 , one end of the spring piece 17 is fixedly connected to the driving piece 13 , and the other end is fixedly connected to the inner wall of the housing 1 . When the pressing block 2 slides down, the spring piece 17 is deformed by force.

[0038] When the pressing block 2 slides down, the driving piece 13 drives the end of the spring piece 17 to slide down and make the spring piece 17 abut against the boss 18, thereby causing the spring piece 17 to deform. When the pressing block 2 is not subjected to external force, the spring piece 17 recovers its deformation and bounces the driving piece 13 up, so that the driving piece 13 is reset and the end of the driving piece 13 is separated from the protrusion 14, thereby bidirectionally disconnecting the circuit, which is beneficial to reduce the error contact caused by vibration of the micro switch and reduce the situation where the circuit is mistakenly connected due to external influences.

[0039] 2 and 3 , in this embodiment, the heights of both ends of the spring piece 17 from the boss 18 are higher than the height of the bottom end thereof from the boss 18 , and the spring piece 17 is disposed between the raised portion 14 and the bump 12 .

[0040] The spring piece 17 can buffer the downward pressure of the pressing block 2 on the driving piece 13 while achieving the reset of the driving piece 13 , thereby buffering the impact between the end of the driving piece 13 and the protrusion 14 , which is beneficial to protecting the driving piece 13 .

[0041] 2 and 3 , in this embodiment, a first guide channel 19 and a second guide channel 20 are passed through the top of the shell 1, the pressing block 2 passes through the first guide channel 19, a plurality of tightening blocks 4 are provided, and a plurality of second guide channels 20 are provided corresponding to the number of tightening blocks 4, and the plurality of tightening blocks 4 slide in the plurality of second guide channels 20 respectively.

[0042] The cooperation between the first guide channel 19 and the second guide channel 20 makes the downward movement of the pressing block 2 more stable, which helps to reduce the downward deviation of the pressing block 2.

[0043] 2 and 3 , in this embodiment, the pressing block 4 is disposed close to the driving piece 13 , the top of the pressing block 4 is an inclined surface 21 , and the inclined upper end of the inclined surface 21 is disposed close to the pressing block 2 .

[0044] When the pressing block 2 is not subjected to the pressing force, the pressing block 2 drives the pressing block 4 to slide upward, so that the inclined upper end of the inclined surface 21 first abuts against the top of the second guide channel 20, thereby limiting the further upward sliding of the pressing block 2 and the pressing block 4, which is beneficial to limiting the length of the pressing block 2 sliding out of the shell 1.

[0045] The above are all preferred embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A microswitch, characterized in that: It includes a housing (1), a pressing block (2) provided at the top of the housing (1), a reset member for resetting the pressing block (2), and a circuit board (3) provided on the bottom wall of the housing (1). The pressing block (2) penetrates through the top wall of the housing (1). Part of the pressing block (2) protrudes from the top wall of the housing (1) and part is located inside the housing (1). A tightening block (4) is provided on the side wall of the pressing block (2). A contact moving piece (5) is provided inside the housing (1). One end of the contact moving piece (5) is connected to the circuit board (3), and an extension piece (6) is provided at the other end of the contact moving piece (5). A contact static piece (7) is provided on the bottom wall of the housing (1). A guiding piece (8) is provided below the extension piece (6). The guiding piece (8) extends from the end of the extension piece (6) towards the side away from the tightening block (4). An elastic member is provided on the side of the contact moving piece (5) away from the contact static piece (7). When the pressing block (2) is pressed, the tightening block (4) is staggered from the extension piece (6) in the horizontal direction, and the contact moving piece (5) abuts against the contact static piece (7). When the pressing block (2) is reset, the tightening block (4) is horizontally aligned and the ends thereof are tightly abutted against each other. The elastic member is in a compressed state, and the contact moving piece (5) is separated from the contact static piece (7).

2. The microswitch according to claim 1, characterized in that: The guiding piece (8), the extension piece (6), and the contact moving piece (5) are integrally connected. The connection between the guiding piece (8) and the extension piece (6) has an arc transition, and the connection between the extension piece (6) and the contact moving piece (5) has an arc transition.

3. The microswitch according to claim 2, wherein: The reset member includes an arc transition piece (9) integrally connected to the contact moving piece (5) and a connecting piece (10). The contact moving piece (5) and the connecting piece (10) are both perpendicular to the bottom of the microswitch. The top end of the connecting piece (10) is connected to the top end of the contact moving piece (5) through the arc transition piece (9). The arc section of the arc transition piece (9) abuts against the inner side wall of the housing (1) and is deformed by the extrusion of the inner wall of the housing (1). The connecting piece (10) is fixedly connected to the pin (11).

4. The microswitch according to claim 2, wherein: A convex block (12) is provided at the bottom of the inner wall of the housing (1). A driving piece (13) is provided on the convex block (12). One end of the driving piece (13) is fixed to the convex block (12) and is electrically connected to the contact static piece (7). The circuit board (3) is electrically connected to a protruding portion (14). The end of the driving piece (13) away from the contact static piece (7) is aligned with the protruding portion (14). The side of the driving piece (13) close to the top of the housing (1) abuts against the bottom of the pressing block (2). When the pressing block (2) slides down, the end of the driving piece (13) away from the contact static piece (7) abuts against the protruding portion (14). When the pressing block (2) slides up, the end of the driving piece (13) away from the contact static piece (7) is separated from the protruding portion (14).

5. The microswitch according to claim 4, characterized in that: The driving piece (13) is penetrated with an avoidance hole (15). The driving piece (13) is sleeved on the bump (12) through the avoidance hole (15). The driving piece (13) is integrally connected with the contact static piece (7), and the contact static piece (7) is fixedly attached to the vertical side wall on one side of the bump (12).

6. The microswitch according to claim 5, characterized in that: On the sides of the contact static piece (7) and the contact moving piece (5) that are close to each other, there are both raised metal blocks (16), and the two metal blocks (16) face each other.

7. The microswitch according to claim 5, wherein: The resetting member includes a spring piece (17) provided at the bottom of the driving piece (13). The spring piece (17) is an arc-shaped piece. There is a boss (18) inside the housing (1), and the boss (18) is provided below the spring piece (17). One end of the spring piece (17) is fixedly connected to the driving piece (13), and the other end is fixedly connected to the inner wall of the housing (1). When the pressing block (2) slides down, the spring piece (17) is deformed by force.

8. The microswitch according to claim 7, wherein: The heights of the two ends of the spring piece (17) from the boss (18) are higher than the height of its bottom end from the boss (18), and the spring piece (17) is arranged between the raised portion (14) and the bump (12).

9. The snap-action switch according to claim 1, characterized in that: The top of the housing (1) is penetrated with a first guiding channel (19) and a second guiding channel (20). The pressing block (2) penetrates through the first guiding channel (19). There are multiple pressing blocks (4). The second guiding channel (20) is provided with a plurality corresponding to the number of the pressing blocks (4), and the multiple pressing blocks (4) slide in the multiple second guiding channels (20) respectively.

10. The microswitch according to claim 9, characterized in that: The pressing block (4) is arranged close to the driving piece (13). The top end of the pressing block (4) is an inclined surface (21), and the inclined upper end of the inclined surface (21) is arranged close to the pressing block (2).

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