Microswitch

Abstract

The utility model discloses a microswitch, which comprises a shell, a pressing block arranged at the top end of the shell, a reset piece for resetting the pressing block and a circuit board arranged on the bottom wall of the shell, the pressing block penetrates through the top wall of the shell, the pressing block partially protrudes out of the top wall of the shell and is partially positioned in the shell, and a propping block is arranged on the side wall of the pressing block. A contact moving piece is arranged in the shell, one end of the contact moving piece is connected with the circuit board, the other end of the contact moving piece is provided with an extending piece, and a contact static piece is arranged on the bottom wall of the shell. A guide piece is arranged below the extending piece and extends from the end of the extending piece to the side away from the abutting block, and an elastic piece is arranged on the side, away from the contact static piece, of the contact movable piece. According to the utility model, the hard contact between the contact moving piece and the contact static piece is converted into transmission type elastic contact, the acting force of the elastic piece can buffer the pressure generated when a user presses down strongly, and the abrasion caused by hard impact between the contact moving piece and the contact static piece is reduced.

Description

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 is a contact mechanism that performs switching actions with a specified stroke and a specified force. 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 moving contact piece at the bottom of the key contacts the static contact piece inside the micro switch to generate an electrical signal. However, when the user presses hard for a long time, the moving contact piece or the static contact piece is prone to collide with each other and deform, which may lead to poor contact in the later stage. 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 large downward pressure and to increase the service life of the micro switch, the utility model provides a micro switch.

[0005] The utility model provides a micro switch adopting the following technical solution:

[0006] A micro switch comprises a housing, a pressing block arranged at the top of the housing, a reset member for resetting the pressing block, and a circuit board arranged at the bottom wall of the housing, wherein the pressing block penetrates the top wall of the housing, the pressing block partially protrudes from the top wall of the housing and is partially located inside the housing, a pressing block is arranged on the side wall of the pressing block, a contact movable sheet is arranged inside the housing, one end of the contact movable sheet is connected to the circuit board, the other end of the contact movable sheet is arranged with an extension sheet, and a contact static sheet is arranged 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 offset from the extension piece in the horizontal direction, and the contact movable piece is in contact with the contact static piece; when the pressing block is reset, the pressing blocks are opposite to 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 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 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 plate, one end of the driving plate is fixed to the protrusion and is conductively connected to the contact static plate, the circuit board is electrically connected with a protrusion, the end of the driving plate away from the contact static plate is opposite to the protrusion, and the side of the driving plate 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 plate away from the contact static plate abuts against the protrusion, and when the pressing block slides up, the end of the driving plate away from the contact static plate 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 on one side of the protrusion.

[0012] Preferably, a protruding metal block is provided on one side of the contact static sheet and the contact dynamic sheet that are close to each other, and the two metal blocks are directly opposite to 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, and when the pressing block slides down, the spring sheet is deformed by force.

[0014] Preferably, the heights of both 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 convex block.

[0015] Preferably, the top of the shell is penetrated by a first guide channel and a second guide channel, the pressing block penetrates the first guide channel, a plurality of the clamping blocks are provided, a plurality of the second guide channels are provided corresponding to the number of the clamping blocks, and the plurality of the clamping blocks slide in the plurality of second guide channels respectively.

[0016] Preferably, the pressing block is arranged close to the driving sheet, 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 utility model includes the following beneficial technical effects: when the pressing block is pressed, the pressing block slides down, so that the abutting block slides down and staggers with the extension piece, and the extension piece is blocked by the abutting block, 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, and 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, and when the abutting block returns to the 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 part 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] Figure 1 The utility model is a schematic diagram of the overall structure of a micro switch.

[0019] Figure 2 The utility model is a schematic diagram of the internal structure of a micro switch.

[0020] Figure 3 yes Figure 2 Schematic diagram of the structure of part A in the middle.

[0021] Explanation of the reference numerals: 1. housing; 2. pressing block; 3. circuit board; 4. pressing block; 5. moving contact plate; 6. extension plate; 7. static contact plate; 8. guide plate; 9. arc-shaped transition plate; 10. connecting plate; 11. pin; 12. bump; 13. driving plate; 14. raised portion; 15. avoidance hole; 16. metal block; 17. spring sheet; 18. boss; 19. first guide channel; 20. second guide channel; 21. inclined surface. DETAILED DESCRIPTION

[0022] The following is combined with Figure 1-3 The utility model is described in further detail.

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

[0024] Reference Figure 1-Figure 3A micro switch comprises a housing 1, a pressing block 2 arranged at the top of the housing 1, a reset member for resetting the pressing block 2, and a circuit board 3 arranged at the bottom wall of the housing 1, the pressing block 2 passes through the top wall of the housing 1, the pressing block 2 partially protrudes from the top wall of the housing 1 and is partially located inside the housing 1, a pressing block 4 is arranged on the side wall of the pressing block 2, a contact moving piece 5 is arranged inside the housing 1, one end of the contact moving piece 5 is connected to the circuit board 3, the other end of the contact moving piece 5 is arranged with an extension piece 6, and a contact static piece 7 is arranged 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 clamping block 4. 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 clamping block 4 is offset from 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 clamping block 4 is opposite in the horizontal direction and the ends are in contact with 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, the pressing block 2 slides down, so that the pressing block 4 slides down and staggers with the extension piece 6. The extension piece 6 is no longer blocked by the pressing block 4, so that the extension piece 6 moves toward the 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 is in contact with the contact static piece 7. When the pressing block 2 is released, the pressing block 2 rises, driving the pressing block 4 to slide up. When the pressing block 4 slides up, the end of the pressing 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 to move in the direction away from the contact static piece 7. When the pressing block 4 returns to the state of facing and abutting the end of the extension piece 6, the contact movable piece 5 is pushed to separate from the contact static piece 7, thereby disconnecting the circuit. Through the cooperation of the tightening 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 increase the service life of the micro switch.

[0027] Reference Figure 2 as well as Figure 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, the extension piece 6 and the contact movable piece 5 are metal pieces connected as a whole, and the metal piece has good ductility. The metal piece is stretched and bent to form a three-section integrated metal piece, thereby reducing the process troubles caused by the mutual fixation of the guide piece 8, the extension piece 6 and the contact movable 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, the extension piece 6 and the contact movable piece 5 less likely to break, which is beneficial to improving the service life of the overall structure of the contact movable piece 5.

[0029] Reference Figure 2 as well as Figure 3 In this embodiment, the elastic member includes an arc-shaped 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 arc-shaped transition piece 9. The arc segment of the arc-shaped transition piece 9 is pressed against the inner wall of the housing 1 and 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, so that the contact movable piece 5 is not easily damaged by the impact. The arc-shaped transition piece 9 is fixed to the top of the contact movable piece 5, which is conducive to increasing the elastic moment of the contact movable piece 5, so that the elastic resistance of the contact movable piece 5 is reduced, which is conducive to further protecting the contact movable piece 5. At the same time, it can reduce the reaction force on the connecting piece 10, so that the connection between the connecting piece 10 and the pin 11 is not easy to be disconnected, which is conducive to improving the overall service life of the micro switch.

[0031] Reference Figure 2 as well as Figure 3 In this embodiment, a protrusion 12 is provided at the bottom of the inner wall of the shell 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 shell 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 plate 13 is in the initial position, and the end of the driving plate 13 away from the contact static plate 7 is separated from the protrusion 14. When the pressing block 2 is subjected to downward pressure, the driving plate 13 is pushed and rotated by the pressing block 2, so that the end of the driving plate 13 away from the contact static plate 7 moves to abut against the protrusion 14, so that the contact static plate 7 is connected to the circuit board 3 through the driving plate 13, forming a complete circuit of circuit board 3-protrusion 14-driving plate 13-contact static plate 7-contact moving plate 5-pin 11-circuit board 3.

[0033] Reference Figure 2 as well as Figure 3 In this embodiment, the drive sheet 13 is penetrated by an avoidance hole 15, and the drive sheet 13 is sleeved on the protrusion 12 through the avoidance hole 15. The drive sheet 13 is integrally connected with the contact static sheet 7, and the contact static sheet 7 is fixed on the vertical side wall on one side of the protrusion 12.

[0034] The driving piece 13 is fixed on the protrusion 12 by the fixing of the contact static piece 7. Therefore, the installation and setting of the driving piece 13 can be completed when the contact static piece 7 is installed, making the assembly of the internal structure of the micro switch more convenient and quick. At the same time, by utilizing the metal properties of the contact static piece 7, the connection between the contact static piece 7 and the driving piece 13 allows the driving piece 13 to deform and restore the deformation, reducing the processes required for fixing and conducting, making the internal structure of the micro switch simpler.

[0035] Reference Figure 2 as well as Figure 3 In this embodiment, a raised metal block 16 is provided on the side where the contact static plate 7 and the contact moving plate 5 are close to each other, and the two metal blocks 16 are facing each other.

[0036] When the moving contact piece 5 and the static contact piece 7 are close to each other, the abutment of the two metal blocks 16 is conducive to reducing the distance that the moving contact piece 5 needs to move, and is conducive to reducing the distance that the pressing block 2 needs to slide down, so that the user can press down a shorter distance, which is conducive to improving the hand feeling of use. At the same time, the provision of the two metal blocks 16 is conducive to increasing the spacing between the side walls of the static contact piece 7 and the moving contact piece 5 when the static contact piece 7 and the moving contact piece 5 are in contact with each other, which is conducive to reducing the situation where the moving contact piece 5 abuts against the end of the driving piece 13 to cause a short circuit in the circuit, and is conducive to improving the stability of the overall work.

[0037] Reference Figure 2 as well as Figure 3 In this embodiment, the reset member includes a spring piece 17 arranged at the bottom of the driving plate 13, the spring piece 17 is an arc-shaped piece, a boss 18 is provided inside the shell 1, and the boss 18 is arranged below the spring piece 17. One end of the spring piece 17 is fixedly connected to the driving plate 13, and the other end is fixedly connected to the inner wall of the shell 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 sheet 17 to slide down and make the spring sheet 17 abut against the boss 18, thereby causing the spring sheet 17 to deform. When the pressing block 2 is not subjected to external force, the spring sheet 17 restores 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 the micro switch being vibrated, and reduce the situation where the circuit is mistakenly connected due to external influences.

[0039] Reference Figure 2 as well as Figure 3 In this embodiment, the heights of both ends of the spring sheet 17 from the boss 18 are higher than the height of the bottom end of the spring sheet 17 from the boss 18 , and the spring sheet 17 is disposed between the raised portion 14 and the protrusion 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] Reference Figure 2 as well as Figure 3 In this embodiment, a first guide channel 19 and a second guide channel 20 are penetrated through the top of the shell 1, the pressing block 2 penetrates the first guide channel 19, a plurality of clamping blocks 4 are provided, and a plurality of second guide channels 20 are provided corresponding to the number of clamping blocks 4, and the plurality of clamping 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 movement and deviation of the pressing block 2.

[0043] Reference Figure 2 as well as Figure 3 In this embodiment, the pressing block 4 is arranged close to the driving plate 13 , the top 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 .

[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 end of the second guide channel 20, thereby limiting the continued 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 utility model, and are not intended to limit the protection scope of the present utility model. Therefore, any equivalent changes made based on the structure, shape, and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A micro switch, characterized in that: The invention comprises a housing (1), a pressing block (2) arranged at the top of the housing (1), a resetting member for resetting the pressing block (2), and a circuit board (3) arranged at the bottom wall of the housing (1); the pressing block (2) penetrates the top wall of the housing (1); a portion of the pressing block (2) protrudes from the top wall of the housing (1) and a portion of the pressing block (2) is located inside the housing (1); a pressing block (4) is arranged on the side wall of the pressing block (2); a contact movable sheet (5) is arranged inside the housing (1); one end of the contact movable sheet (5) is connected to the circuit board (3); the other end of the contact movable sheet (5) is provided with an extension sheet (6); and a contact static sheet (7) is arranged on the bottom wall of the housing (1); 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 a side away from the abutting block (4); an elastic member is provided on a side of the contact movable piece (5) away from the contact static piece (7); when the pressing block (2) is pressed, the abutting block (4) is offset from the extension piece (6) in the horizontal direction, and the contact movable piece (5) abuts against the contact static piece (7); When the pressing block (2) is reset, the pressing blocks (4) are facing each other in the horizontal direction and the ends thereof are pressed against each other, the elastic member is in a compressed state, and the contact moving plate (5) is separated from the contact static plate (7).

2. The micro switch according to claim 1, characterized in that: 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.

3. The micro switch according to claim 2, characterized in that: The reset member comprises an arc-shaped 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 end of the connecting piece (10) is connected to the top end of the contact movable piece (5) via the arc-shaped transition piece (9); the arc segment of the arc-shaped transition piece (9) is pressed against the inner wall of the housing (1) and deformed by the compression of the inner wall of the housing (1); and the connecting piece (10) is fixedly connected to the pin (11).

4. The micro switch according to claim 2, characterized in that: A convex block (12) is provided at the bottom of the inner wall of the shell (1), and the convex block (12) is provided with a driving plate (13). One end of the driving plate (13) is fixed to the convex block (12) and is in conduction with the contact static plate (7). The circuit board (3) is electrically connected with a protrusion (14). The end of the driving plate (13) away from the contact static plate (7) is directly opposite to the protrusion (14), and the side of the driving plate (13) close to the top of the shell (1) abuts against the bottom of the pressing block (2); when the pressing block (2) slides down, the end of the driving plate (13) away from the contact static plate (7) abuts against the protrusion (14), and when the pressing block (2) slides up, the end of the driving plate (13) away from the contact static plate (7) is separated from the protrusion (14).

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

6. The micro switch according to claim 5, characterized in that: A protruding metal block (16) is provided on one side of the contact static plate (7) and the contact dynamic plate (5) that are close to each other, and the two metal blocks (16) are directly opposite to each other.

7. The micro switch according to claim 5, characterized in that: The reset member comprises a spring sheet (17) arranged at the bottom of the driving sheet (13), the spring sheet (17) being an arc-shaped sheet, a boss (18) being arranged inside the housing (1), the boss (18) being arranged below the spring sheet (17), one end of the spring sheet (17) being fixedly connected to the driving sheet (13), and the other end being fixedly connected to the inner wall of the housing (1), and when the pressing block (2) slides down, the spring sheet (17) is deformed by force.

8. The micro switch according to claim 7, characterized in that: The heights of the two ends of the spring sheet (17) from the boss (18) are higher than the height of the bottom end from the boss (18), and the spring sheet (17) is arranged between the raised portion (14) and the convex block (12).

9. The micro switch according to claim 1, characterized in that: 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 the pressing blocks (4) are provided; a plurality of the second guide channels (20) are provided corresponding to the number of the pressing blocks (4); and the plurality of pressing blocks (4) slide in the plurality of second guide channels (20) respectively.

10. The micro switch according to claim 9, characterized in that: The pressing block (4) is arranged close to the driving plate (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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