Microswitch

Abstract

The microswitch comprises a shell, a movable contact piece, a static contact piece, a first conductive piece and a second conductive piece are arranged in the shell, one end of the movable contact piece is in conductive contact with the static contact piece in a matched mode, and one end of the first conductive piece is arranged in the shell in a penetrating mode and provided with a supporting frame connected with the other end of the movable contact piece in a matched mode. One end of the second conductive piece penetrates through the interior of the shell and is connected with the static contact piece, the other ends of the first conductive piece and the second conductive piece penetrate through the outer side of the shell and are provided with wiring terminals, a through hole communicated with the interior of the shell is formed in the top of the shell, and an operation block connected with the movable contact piece movably penetrates through the through hole up and down; a guide hole is formed in the lower end of the operation block, a guide column is arranged in the shell, and the upper end of the guide column is in matched guide sliding connection with the guide hole in the lower end of the operation block. The microswitch provided by the utility model is more stable during pressing operation and is not easy to shake.

Description

Technical Field

[0001] The utility model relates to a micro switch. Background Art

[0002] A micro switch is a commonly used electronic component, also known as a "micro switch", "limit switch" or "contact switch".

[0003] The Chinese utility model patent discloses a large-pitch micro switch (CN202221950671.0), which includes a housing, an operating block, a first pin, a second pin and a third pin are arranged on the housing, a support frame and a moving contact piece swingably arranged on the support frame are swingably arranged on the first pin, a static contact piece is arranged on the second pin and the third pin, the moving contact piece is arranged on one side of the support frame corresponding to the static contact piece, and a tension spring is arranged on the moving contact piece. Under normal conditions, the moving contact piece fits one of the static contact pieces under the pull of the tension spring, and when the user presses the operating block, the moving contact piece will overcome the elastic force of the tension spring and move to fit with the other static contact piece, forming a state switch.

[0004] In the above patent, combined with the drawings of the patent, it can be seen that the operating block is slidably set at the through hole of the shell, and guided by the through hole, the movement of the operating block is usually straight up and down. Due to the limitation of volume, the axial length of the through hole is usually short, and there is a certain gap between the through hole and the operating block, which makes the operating block easy to shake and easy to get stuck when pressing. Summary of the invention

[0005] The utility model provides a micro switch, the operation block of which is more stable during pressing operation and is not prone to shaking.

[0006] The utility model provides a micro switch, comprising a shell, wherein a moving contact piece, a stationary contact piece, a first conductive member, and a second conductive member are arranged inside the shell, one end of the moving contact piece cooperates with the stationary contact piece for conductive contact, one end of the first conductive member is penetrated inside the shell and is provided with a support frame cooperated and connected with the other end of the moving contact piece, one end of the second conductive member is penetrated inside the shell and is connected with the stationary contact piece, the other ends of the first conductive member and the second conductive member are penetrated outside the shell and are provided with a wiring terminal, the wiring terminal is used for wiring, a through hole connected to the interior of the shell is provided at the top of the shell, an operating block connected with the moving contact piece is movably penetrated at the through hole up and down, a guide hole is opened at the lower end of the operating block, a guide column is arranged in the shell, the upper end of the guide column cooperates with the guide hole at the lower end of the operating block for guiding sliding connection, the operating block adopts this sliding connection mode to reasonably utilize the internal space of the shell, can increase the axial length of the sliding matching part, thereby improving the up and down sliding effect of the operating block, improving the stability of the operating block, and making it difficult for the operating block to be stuck when sliding.

[0007] Furthermore, a support rod is fixedly arranged inside the guide column, so as to reinforce the guide column by the support rod, so that it is not easy to deform and break, and the strength of the guide column is improved.

[0008] Furthermore, the support rod is integrally formed on the first conductive member or the second conductive member, which has a simple structure and is convenient for processing the support rod.

[0009] Furthermore, the guide column and the housing are integrally formed, and the support rod is integrally injection-molded inside the guide column, so as to facilitate the processing of the guide column, the housing and the support rod.

[0010] Furthermore, a spring is sleeved on the guide column and abuts against the lower end of the operating block. The spring is used to realize the upward resetting action of the operating block.

[0011] Furthermore, a waterproof cap is provided at the corresponding through hole on the upper part of the shell, and the waterproof cap includes a connecting seat connected to the shell and a flexible membrane fixed to the upper end of the operating block. The operating block and the guide column constitute a limit fit to prevent the relative rotation of the two. The limit fit prevents the operating block from rotating, preventing the flexible membrane from twisting, thereby improving the waterproof effect.

[0012] Furthermore, the contour of the sliding fit between the operating block and the guide column is non-circular, so that relative rotation does not occur between the operating block and the guide column.

[0013] Furthermore, the side of the operating block is provided with a slide groove, and the side of the guide column is provided with a slider that slides up and down in cooperation with the slide groove. The cooperation between the slide groove and the slider can prevent the operating block and the guide column from rotating relative to each other, and can also prevent the operating block from slipping out of the guide column upwards.

[0014] Furthermore, the upper part of the shell is provided with a notch at the position corresponding to the through hole, and an annular stepped groove is provided at the notch, and the upper end and the side end of the shell are provided with grooves connected to the notch, and the connection seat of the waterproof cap includes a base embedded in the notch, an annular portion provided at the lower end of the base and embedded in the stepped groove, and a fixing sheet provided at the lower end and the side and embedded and fixed in the groove of the shell, and the waterproof cap is overmolded on the shell. The design of the base, notch, annular portion, groove, fixing sheet and other structures can improve the combination effect of the waterproof cap and the shell during overmolding, and improve the reliability and waterproof effect of the connection.

[0015] Furthermore, the other end of the movable contact piece is provided with a transmission connection part, and the side of the operating block is provided with a mounting groove that fits in with the transmission connection part of the movable contact piece, and the operating block can drive the movable contact piece to swing through the mounting groove when sliding up and down. By adopting this transmission connection structure between the operating block and the movable contact piece, the operating block can reduce the deformation of the transmission connection part when driving the movable contact piece to swing, thereby increasing the service life of the movable contact piece.

[0016] The beneficial effects of the utility model are as follows: the utility model reasonably utilizes the internal space of the shell, and realizes the guiding movement of the operating block through the cooperation of the guide column arranged inside the shell. The operating block adopts an intermediate guiding structure, which is simple and compact in structure, improves the stability of the operating block when sliding up and down, solves the problem of button tilting when the switch is pushed sideways, and makes the switch work more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural diagram of an embodiment of the utility model;

[0018] Figure 2 An exploded view of an embodiment of the utility model;

[0019] Figure 3 This is a structural diagram of a waterproof cap according to an embodiment of the utility model;

[0020] Figure 4 This is a schematic diagram of the connection of the moving contact piece of the embodiment of the utility model;

[0021] Figure 5 It is a cross-sectional view of an embodiment of the utility model. DETAILED DESCRIPTION

[0022] The implementation of the micro switch of the utility model is as follows: Figure 1-5As shown: the housing includes an upper shell 11, a base 12, and a protective cover 13. The lower part of the upper shell 11 is provided with a notch. The base 12 is fixedly mounted on the lower end of the upper shell 11. The protective cover 13 is fixedly mounted on the lower end of the base 12. An inner cavity is formed between the upper shell 11 and the base 12 for installing the internal components of the micro switch. The protective cover 13 is used to cover and protect the wiring terminals of the micro switch. A moving contact piece 21, a stationary contact piece 22, a first conductive member 23, and a second conductive member 24 are arranged inside the housing. There is one moving contact piece 21 and one stationary contact piece 23. There are two first and second conductive members 22 and 24, respectively. The moving contact piece 21 is swingably arranged between the two stationary contact pieces 22, one end of the moving contact piece 21 cooperates with the two stationary contact pieces 22 for conductive contact, one end of the first conductive member 23 is passed through the interior of the shell and is provided with a support frame 25 which is connected with the other end of the moving contact piece 21, one end of the two second conductive members 24 is passed through the interior of the shell and is connected with the two stationary contact pieces 22, the other ends of the first conductive member 23 and the second conductive member 24 are passed through the outside of the shell and are provided with a wiring terminal 25, and the wiring terminal 25 is used for wiring. A through hole 111 communicating with the interior of the shell is provided at the top, and an operating block 3 connected to the movable contact piece 21 is movably penetrated up and down at the through hole 111. A guide hole 31 is opened at the lower end of the operating block 3, and a guide column 112 is provided in the shell. The upper end of the guide column 112 cooperates with the guide hole 31 at the lower end of the operating block 3 to guide and slide. The operating block 3 adopts this sliding connection method to reasonably utilize the internal space of the shell, which can increase the axial length of the sliding fit, thereby improving the up and down sliding effect of the operating block 3, improving the stability of the operating block 3, and making it less likely for the operating block 3 to get stuck when sliding.

[0023] like Figure 5 As shown, a support rod 231 is fixedly arranged inside the guide column 112. The guide column 112 is reinforced by the support rod 231, so that it is not easy to deform and break, and the strength of the guide column 112 is improved.

[0024] In this embodiment, the support rod 231 is integrally formed on the first conductive member 23, and the distance between the support rod 231 and the first conductive member 23 is closer. It is more reasonable and cost-saving to integrally form the support rod 231 on the first conductive member 23. In other embodiments, the support rod 231 can also be integrally formed on the second conductive member 24. Integrally forming the support rod 231 on the conductive member reasonably utilizes the material characteristics of the conductive member and facilitates the processing of the support rod 231.

[0025] In addition, in other embodiments, the support rod 231 may also be a separate component that has no connection relationship with the first conductive member 23 and the second conductive member 24 .

[0026] In this embodiment, the guide column 112 and the upper shell 11 of the housing are integrally formed by injection molding, and the support rod 231 is integrally formed by injection molding inside the guide column 112 .

[0027] In other embodiments, the guide column 112 may also be a separate component, which is fixedly mounted on the housing via a connection structure with the housing.

[0028] In other embodiments, a mounting hole may be processed inside the guide column 112 , and the support rod 231 may be installed and fixed in the mounting hole of the guide column 112 by inserting.

[0029] The guide column 112 is sleeved with a spring 4 abutting against the lower end of the operating block 3. The spring 4 is used to realize the upward reset action of the operating block 3, and the spring 4 can also be used to cooperate to realize the reset swing of the movable contact piece 21.

[0030] The upper part of the housing is provided with a waterproof cap 5 at the corresponding through hole 111, and the waterproof cap 5 includes a connection seat connected with the upper shell 11 of the housing, and a flexible membrane 51 fixed with the upper end of the operating block 3. The operating block 3 and the guide column 112 form a limit fit to prevent the relative rotation of the two. The limit fit prevents the operating block 3 from rotating, prevents the flexible membrane 51 from twisting, and improves the waterproof effect.

[0031] In order to prevent the operating block 3 from rotating, the contour of the sliding fit between the operating block 3 and the guide column 112 is non-circular, for example, a polygon, so that the operating block 3 and the guide column 112 do not rotate relative to each other.

[0032] The side of the operating block 3 is provided with a slide groove 32, and the side of the guide column 112 is provided with a slider 113 that slides up and down in cooperation with the slide groove 32. In this embodiment, the slide groove 32 communicates with the inner and outer sides of the guide hole 31. The cooperation between the slide groove 32 and the slider 113 can prevent the operating block 3 and the guide column 112 from rotating relative to each other on the one hand, and the closed lower end of the slide groove 32 can prevent the operating block 3 from slipping out of the guide column 112 upwards on the other hand.

[0033] The upper shell 11 is provided with a notch 114 at the position corresponding to the through hole 111, and an annular stepped groove 115 is provided at the notch 114. The upper end and the side end of the upper shell 11 are both provided with a groove 116 connected to the notch 114. The connection seat of the waterproof cap 5 includes a base 521 embedded in the notch, an annular portion 522 arranged at the lower end of the base 521 and embedded in the stepped groove 115, and a fixing plate 523 arranged at the lower end and the side and embedded and fixed in the groove 116 of the shell. The waterproof cap 5 is molded on the shell. The design of the structures such as the base 521, the notch 114, the annular portion 522, the annular groove 115, the groove 116, the fixing plate 523 and the like can improve the combination effect of the waterproof cap 5 and the shell during the plastic overmolding, and improve the reliability and waterproof effect of the connection.

[0034] The flexible membrane 51 of the waterproof cap 5 can be deformed accordingly when the operating block 3 moves up and down. The flexible membrane 51 is in a conical structure, and the top end of the flexible membrane 51 is sleeved and fixed in the annular groove at the upper end of the operating block 3 .

[0035] The other end of the movable contact piece 21 is provided with a transmission connection part 211, and the side position of the operating block 3 facing away from the movable contact piece 21 is provided with a mounting groove 33 that cooperates with the transmission connection part 211 of the movable contact piece 21. When the operating block 3 slides up and down, it can drive the movable contact piece 21 to swing through the mounting groove 33, thereby realizing the on-off coordination between the movable contact piece 21 and the two stationary contact pieces 22. This transmission connection structure is adopted between the operating block 3 and the movable contact piece 21, and the operating block 3 can reduce the deformation of the transmission connection part 211 when driving the movable contact piece 21 to swing, thereby improving the service life of the movable contact piece 21.

[0036] The above embodiment is only one of the preferred specific embodiments of the present invention. Common changes and substitutions made by those skilled in the art within the technical solution of the present invention are all included in the protection scope of the present invention.

Claims

1. A micro switch, comprising a housing, a moving contact piece, a stationary contact piece, a first conductive member, and a second conductive member are arranged inside the housing, one end of the moving contact piece cooperates with the stationary contact piece for conductive contact, one end of the first conductive member is passed through the housing and provided with a support frame that cooperates with the other end of the moving contact piece, one end of the second conductive member is passed through the housing and connected to the stationary contact piece, the other ends of the first conductive member and the second conductive member are passed through the outside of the housing and provided with a wiring terminal, a through hole connected to the inside of the housing is provided at the top of the housing, an operating block connected to the moving contact piece is movably passed through the through hole up and down, and the characteristics are: A guide hole is provided at the lower end of the operating block, a guide column is arranged in the shell, and the upper end of the guide column is matched with the guide hole at the lower end of the operating block for guiding sliding connection.

2. The micro switch according to claim 1, characterized in that: A support rod is fixedly arranged inside the guide column.

3. The micro switch according to claim 2, characterized in that: The support rod is integrally formed on the first conductive member or the second conductive member.

4. The micro switch according to claim 3, characterized in that: The guide column and the shell are integrally formed, and the support rod is integrally injection-molded inside the guide column.

5. The micro switch according to claim 1, characterized in that: A spring is sleeved on the guide column and abuts against the lower end of the operating block.

6. The micro switch according to claim 1, characterized in that: A waterproof cap is provided at the corresponding through hole on the upper part of the shell, and the waterproof cap includes a connecting seat connected to the shell and a flexible membrane fixed to the upper end of the operating block. The operating block and the guide column form a limit fit to prevent the relative rotation of the two.

7. The micro switch according to claim 6, characterized in that: The contour of the sliding fit between the operating block and the guide column is non-circular.

8. The micro switch according to claim 6, characterized in that: The side of the operating block is provided with a slide groove, and the side of the guide column is provided with a sliding block which cooperates with the slide groove to slide up and down.

9. The micro switch according to claim 6, characterized in that: A notch is provided on the upper part of the shell at the position corresponding to the through hole, and an annular stepped groove is provided at the notch. The upper end and the side end of the shell are both provided with grooves connected to the notch. The connecting seat of the waterproof cap includes a base embedded in the notch, an annular portion arranged at the lower end of the base and embedded in the stepped groove, and a fixing plate arranged at the lower end and the side and embedded and fixed in the groove of the shell. The waterproof cap is plastic-molded on the shell.

10. The micro switch according to claim 1, characterized in that: The other end of the moving contact piece is provided with a transmission connection part, and the side of the operating block is provided with a mounting groove which is matched and embedded with the transmission connection part of the moving contact piece.

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