Brake mechanism for microswitch

Abstract

The utility model discloses a brake mechanism for a microswitch, which not only realizes smooth rotation and sliding touch through an elliptical arc part, but also ensures that the touch action more approximately vertically acts on a contact part by arranging the elliptical arc part on a rotating disc. A line formed by the outermost side point of the elliptical arc part and the center of the rotating disc is perpendicular to the contact surface of the contact part of the microswitch, so that the rotating disc can be in front contact with the contact part in a vertical and uniform manner in the rotating process, and direct impact and abrasion to the microswitch are avoided; therefore, the accuracy and the stability of touch control are improved, and the service life of the microswitch is obviously prolonged.

Description

Technical Field

[0001] The utility model specifically relates to a braking mechanism for a micro switch. Background Art

[0002] In existing products for controlling the lifting of steel wire ropes, such as clothes drying machines, it is usually necessary to use a brake mechanism for a micro switch to control the lifting, starting or stopping of the steel wire rope to achieve automatic control.

[0003] China Publication No. CN211712502U discloses a brake mechanism for a lifting and pulling line travel micro switch of an electric lifting clothes drying rack, comprising a machine box (1), two symmetrically arranged winding wheels (3) are arranged in the machine box (1), an upper travel touch switch (41) and a lower travel touch switch (42) connected to an electric control mechanism are arranged on the machine box (1), the upper travel touch switch (41) and the lower travel touch switch (42) are both located on the periphery of a trigger turntable (44), and the upper travel touch switch (41) and the lower travel touch switch (42) are both located on the periphery of a trigger turntable (44). An upper limit stopper (44a) and a lower limit stopper (44b) are provided on the outer edge of the disk (44). The winding wheel (3) is connected to the trigger turntable (44) through a gear reduction structure (43) and can drive the trigger turntable (44) to rotate. When the trigger turntable (44) rotates a set angle, the upper limit stopper (44a) and the lower limit stopper (44b) can respectively contact the upper stroke touch switch (41) and the lower stroke touch switch (42) to generate an upper stroke signal and a lower stroke signal respectively. However, the lateral touch switch is a micro switch, and the operation mode of the trigger turntable (44) touching the micro switch through the upper limit stopper (44a) and the lower limit stopper (44b) is to touch the switch point from the side. Such a touching mode causes direct impact and wear on the micro switch, resulting in easy damage to the micro switch and shortened service life.

[0004] Therefore, how to overcome the above-mentioned defects has become an important issue to be solved urgently by those skilled in the art. Utility Model Content

[0005] The utility model overcomes the shortcomings of the above-mentioned technology and provides a braking mechanism for a micro switch.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A braking mechanism for a micro switch comprises a rotating disk 1 and a micro switch 2 arranged on one side of the rotating disk 1, wherein the micro switch 2 is provided with a contact portion 200; the rotating disk 1 is provided with an outwardly protruding elliptical arc portion 100, and the elliptical arc portion 100 is used to touch the contact portion 200 by rotating and sliding; when the outermost point of the elliptical arc portion 100 touches the contact portion 200 of the micro switch 2, the connecting line formed between the outermost point of the elliptical arc portion 100 and the center of the rotating disk 1 is perpendicular to the contact surface of the contact portion 200 of the micro switch 2.

[0008] Preferably, it also includes: a manual braking structure for manually controlling the rotating disk 1 to stop rotating or resume rotating, the manual braking structure including: a first annular meshing rack 31 arranged on the inner circumferential wall of the rotating disk 1, a brake slider 32 that can slide under manual control, and a toothed protrusion portion 33 arranged on the brake slider 32 and protruding toward the first meshing rack 31; the toothed protrusion portion 33 is inserted into the groove of the first meshing rack 31 when sliding outward, thereby hindering the rotation of the rotating disk 1, and loosens the first meshing rack 31 when sliding inward, thereby allowing the rotating disk 1 to resume rotating.

[0009] Preferably, the rotating disk 1 includes: a base 11 and a shell 12 fixedly connected to the base 11, the shell 12 covers the base 11 therein, the top of the base 11 is recessed downwardly with a first groove 111, and the bottom is recessed upwardly with a second groove 112, the side groove wall of the first groove 111 is protruding inwardly toward the center direction of the rotating disk 1 with the first meshing rack 31, the side groove wall of the second groove 112 is protruding inwardly toward the center direction of the rotating disk 1 with a ring-shaped second meshing rack 1121; the second meshing rack 1121 is meshed with an external meshing rack for transmission; the elliptical arc portion 100 is arranged on the shell 12.

[0010] Preferably, the brake slider 32 is provided with a button body 321 and a protrusion 322 arranged on the top of the button body 321, the protrusion 322 is exposed to the rotating disk 1 for easy touch by hand, the outer shell 12 is provided with an opening 121 for exposing the protrusion 322, and the tooth-shaped protrusion 33 is protruded on the outer periphery of the button body 321.

[0011] Preferably, the button body 321 is provided with an avoidance groove 3211 at the top of one side thereof, which can avoid the first meshing rack 31 when the rotating disk 1 rotates, and the tooth-shaped protruding strip portion 33 is protruded on the side groove wall of the avoidance groove 3211.

[0012] Preferably, the base 11 is recessed downward on the basis of the bottom groove wall of the first groove 111 to form a raised step portion 113 and a third groove 114, and a screw hole 115 is opened on the bottom groove wall of the third groove 114, and a screw 116 is installed in the screw hole 115; the button body 321 is provided with an avoidance support portion 3212 at the bottom position on the other side thereof, which can avoid the raised step portion 113 and can be placed on the bottom groove wall of the third groove 114.

[0013] Preferably, a self-resetting structure is provided between the rotating disk 1 and the manual brake structure, and the self-resetting structure is used to make the toothed protrusion portion 33 automatically loosen from the first meshing rack 31 due to reset when the brake slider 32 is released by hand, thereby allowing the rotating disk 1 to resume rotation.

[0014] Preferably, the self-resetting structure is a spring 4 , and a connecting portion 3213 is protrudingly provided on the outer side wall of the button body 321 on the other side thereof, and the spring 4 is connected to the connecting portion 3213 .

[0015] Preferably, the housing 12 is provided with a guide mounting groove 122 inside the opening 121 for the brake slider 32 to slide therein; the guide mounting groove 122 is formed with a first groove portion 1221 with a narrow groove width at a position away from the first meshing rack 31 and a second groove portion 1222 with a wider groove width at a position close to the first meshing rack 31; the groove width of the first groove portion 1221 is smaller than the width of the button body portion 321, thereby preventing the brake slider 32 from sliding excessively; the first groove portion 1221 is provided with a first side wall 12211 horizontally symmetrically arranged with the connecting portion 3213, and a corner portion 12212 extending from the first side wall 12211 to the groove of the second groove portion 1222, and the corner portion 12212 is rounded; one end of the spring 4 is connected to the connecting portion 3213, and the other end abuts against the first side wall 12211.

[0016] Preferably, the contact portion 200 is an arc convex structure.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] 1. This case not only realizes the smooth rotation and sliding touch through the elliptical arc part by setting the elliptical arc part on the rotating disk, but also ensures that the touch action is closer to vertical action on the contact part. Moreover, the line formed by the outermost point of the elliptical arc part and the center of the rotating disk is arranged perpendicular to the contact surface of the contact part of the micro switch, ensuring that the rotating disk can touch the contact part in a vertical and uniform manner during the rotation process, thereby avoiding direct impact and wear on the micro switch, and also improving the accuracy and stability of the touch, thereby significantly extending the service life of the micro switch.

[0019] 2. The braking mechanism of this case is provided with a manual braking structure so that the start and stop of the rotating disk can be manually controlled. It is easy to use. On the one hand, it can also be manually controlled when the external drive fails; on the other hand, it can avoid unnecessary impact and damage to the micro switch caused by improper operation of the external drive, thereby extending the service life of the micro switch. Previously, the manual braking structure can accurately control the stop or resumption of rotation of the rotating disk through the sliding operation of the braking slider. The meshing design of the toothed convex strip portion and the first meshing rack ensures the stability of the braking. When the toothed convex strip portion is inserted into the groove of the first meshing rack, it can effectively hinder the rotation of the rotating disk, thereby achieving a stable braking effect.

[0020] 3. The brake mechanism of this case is provided with a spring between the rotating disk and the manual brake structure, so that the manual brake structure has a self-reset function. When the brake slider is released by hand, the spring can use its resilience to pull the button body back to the original position, so that the toothed convex strip part can be self-loosened from the first meshing rack, so that the rotating disk can resume its free rotation state when not affected by external force, thereby improving the convenience of use and user experience of the brake mechanism of this case. Due to the automatic reset effect of the spring, the user no longer needs to slide the brake slider back to the original position. The user only needs to release the brake slider without performing additional operations, which further simplifies the operation process and improves the operation efficiency. In addition, by providing a connecting portion on the outer side wall of the button body to connect the spring, it is convenient for the installation of the spring and the structure is more compact. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is one of the structural diagrams of a single braking mechanism in this case.

[0022] Figure 2 It is a structural schematic diagram of the case in which two braking mechanisms are installed on an external driving mechanism.

[0023] Figure 3 It is a schematic diagram of the structure in which the brake mechanism hides the housing.

[0024] Figure 4 This is the second structural diagram of a single braking mechanism in this case.

[0025] Figure 5 It is a structural schematic diagram of the brake slider in this case.

[0026] Figure 6 It is a structural diagram of the micro switch in this case.

[0027] Figure 7 It is a schematic diagram of the structure in which the housing of this case is equipped with a brake slider and a spring.

[0028] Figure 8It is a structural schematic diagram of the shell of this case. DETAILED DESCRIPTION

[0029] The following examples further illustrate the features of the present invention and other related features to facilitate understanding by those skilled in the art:

[0030] like Figures 1 to 8 As shown, a braking mechanism for a micro switch comprises a rotating disk 1 driven by an external driving mechanism to rotate and swing, and a micro switch 2 arranged on one side of the rotating disk 1, wherein the micro switch 2 is provided with a contact portion 200, and the rotating disk 1 is provided with an elliptical arc portion 100 protruding outward for touching the contact portion 200 by rotating and sliding; when the outermost point of the elliptical arc portion 100 touches the contact portion 200 of the micro switch 2, the line formed by the outermost point of the elliptical arc portion 100 and the center of the rotating disk 1 is perpendicular to the contact surface of the contact portion 200 of the micro switch 2.

[0031] As described above, by setting the elliptical arc portion 100 on the rotating disk 1, this case not only realizes the smooth rotation and sliding touch through the elliptical arc portion 100, but also ensures that the touch action is closer to vertical action on the contact portion 200. In addition, the line formed by the outermost point of the elliptical arc portion 100 and the center of the rotating disk 1 is arranged perpendicular to the contact surface of the contact portion 200 of the micro switch 2, ensuring that the rotating disk 1 can touch the contact portion 200 in a vertical and uniform manner during the rotation process, thereby avoiding direct impact and wear on the micro switch, and also improving the accuracy and stability of the touch, thereby significantly extending the service life of the micro switch.

[0032] like Figure 3 and Figure 5 As shown, in a specific implementation, the braking mechanism of this case also includes: a manual braking structure for manually controlling the rotating disk 1 to stop rotating or resume rotating, and the manual braking structure includes: a first annular meshing rack 31 arranged on the inner circumferential wall of the rotating disk 1, a braking slider 32 that can slide under manual control, and a toothed protrusion portion 33 arranged on the braking slider 32 and protruding toward the first meshing rack 31; the toothed protrusion portion 33 is inserted into the groove of the first meshing rack 31 when sliding outward, thereby hindering the rotation of the rotating disk 1, and loosens the first meshing rack 31 when sliding inward, thereby allowing the rotating disk 1 to resume rotating.

[0033] As described above, the braking mechanism of this case is provided with a manual braking structure so as to manually control the start and stop of the rotating disk 1. It is easy to use. On the one hand, it can also be manually controlled when the external drive fails; on the other hand, it can avoid unnecessary impact and damage to the micro switch 2 caused by improper operation of the external drive, thereby extending the service life of the micro switch. Previously, the manual braking structure can accurately control the stop or resumption of rotation of the rotating disk 1 through the sliding operation of the braking slider 32. The meshing design of the toothed convex strip portion 33 and the first meshing rack 31 ensures the stability of the braking. When the toothed convex strip portion 33 is inserted into the groove of the first meshing rack 31, it can effectively hinder the rotation of the rotating disk 1, thereby achieving a stable braking effect.

[0034] like Figure 3 and Figure 4 As shown, in a specific implementation, the rotating disk 1 includes: a base 11 and a shell 12 fixedly connected to the base 11, the shell 12 covers the base 11 therein, the top of the base 11 is concavely provided with a first groove 111 downwardly, and the bottom is concavely provided with a second groove 112 upwardly, the side groove wall of the first groove 111 is provided with the first meshing rack 31 inwardly toward the center direction of the rotating disk 1, and the side groove wall of the second groove 112 is provided with a ring-shaped second meshing rack 1121 inwardly toward the center direction of the rotating disk 1; the second meshing rack 1121 is meshed with the external meshing rack for transmission; the elliptical arc portion 100 is provided on the shell 12. In this way, the fixed connection design of the base 11 and the shell 12 makes the entire rotating disk 1 compact and highly integrated. The shell 12 covers the base 11 therein, which not only protects the internal structure, but also improves the overall mechanical strength. The first meshing rack 31 arranged in the first groove 111 and the second meshing rack 1121 arranged in the second groove 112, on the one hand, cooperate with the braking structure through the first meshing rack 31 to achieve precise braking of the rotating disk, and on the other hand, the second meshing rack 1121 is meshed with the external meshing rack to achieve rotational drive of the rotating disk.

[0035] like Figure 5As shown, in a specific implementation, the brake slider 32 is provided with a button body 321 and a protrusion 322 provided on the top of the button body 321. The protrusion 322 is exposed on the rotating disk 1 for easy touch by human hands. The housing 12 is provided with an opening 121 for the protrusion 322 to be exposed. The tooth-shaped convex strip 33 is convexly provided on the outer periphery of the button body 321. In this way, through the design of the protrusion 322 on the brake slider 32 and the setting of the opening 121 provided on the housing 12, the user can easily apply force, thereby easily sliding the brake slider 32, and the operation is simple and convenient. The setting of the tooth-shaped convex strip 33 convexly provided on the outer periphery of the button body 321 is convenient for the tooth-shaped convex strip 33 to be more closely engaged with the first meshing rack 31 when the user slides the protrusion 322, thereby improving the stability and reliability of the brake.

[0036] like Figure 5 As shown, in a specific implementation, the button body 321 is provided with a avoidance groove 3211 at the top position on one side thereof, which can avoid the first meshing rack 31 when the rotating disk 1 rotates, and the tooth-shaped convex strip portion 33 is convexly arranged on the side groove wall of the avoidance groove 3211. In this way, the setting of the avoidance groove 3211 allows the first meshing rack 31 to smoothly pass through the avoidance groove 3211 when the rotating disk 1 rotates, ensuring the smooth rotation of the rotating disk 1. The tooth-shaped convex strip portion 33 is convexly arranged on the side groove wall of the avoidance groove 3211, and the structure is compact, realizing the compact fit between the brake slider 32 and the rotating disk 1.

[0037] like Figure 3 and Figure 4 As shown, in a specific implementation, the base 11 is concave downward on the basis of the bottom groove wall of the first groove 111 to form a raised step portion 113 and a third groove 114, and a screw hole 115 is provided on the bottom groove wall of the third groove 114, and a screw 116 is installed in the screw hole 115; the button body 321 is provided with a position-avoiding support portion 3212 at the bottom position on the other side thereof, which can avoid the raised step portion 113 and can be placed on the bottom groove wall of the third groove 114. In this way, through the provision of the raised step portion 113 and the third groove 114, a stable installation position is provided for the button body 321, so that the subsequent position-avoiding support portion 3212 can be placed on the bottom groove wall of the third groove 114, thereby ensuring the stability of the button body 321 and reducing displacement or looseness caused by vibration or external force. The arrangement of the screw hole 115 and the screw 116 enables the button body 321 to be easily installed on the base 11, and can also be quickly disassembled by loosening the screw 116 when maintenance or replacement of parts is required, making assembly and disassembly convenient. In addition, the groove design of the base 11 and the avoidance support portion 3212 of the button body 321 can not only effectively utilize space to make the entire structure more compact, but also save materials.

[0038] like Figure 3 and Figure 7 As shown, in a specific implementation, a self-reset structure is provided between the rotating disk 1 and the manual brake structure, and the self-reset structure is used to make the toothed protrusion 33 automatically loosen from the first meshing rack 31 due to reset when the brake slider 32 is released by hand, so as to resume the rotation of the rotating disk 1. The self-reset structure is a spring 4, and the button body 321 has a connecting portion 3213 protruding on the outer side wall of the other side thereof, and the spring 4 is connected to the connecting portion 3213.

[0039] As described above, the brake mechanism of this case is provided with a spring 4 between the rotating disk 1 and the manual brake structure, so that the manual brake structure has a self-reset function. When the brake slider 322 is released by hand, the spring 4 can use its resilience to pull the button body 321 back to the original position, so that the toothed convex strip 33 is self-loosened from the first meshing rack 31, so that the rotating disk 1 can restore its free rotation state when not subject to external force, thereby improving the convenience of use and user experience of the brake mechanism of this case. Due to the automatic reset effect of the spring 4, the user no longer needs to slide the brake slider 322 back to the original position. The user only needs to release the brake slider 322 without performing additional operations, which further simplifies the operation process and improves the operation efficiency. In addition, by providing a connecting portion 3213 on the outer wall of the button body 321 to connect the spring 4, it is convenient for the installation of the spring and the structure is more compact.

[0040] like Figure 7 and Figure 8 As shown, in a specific implementation, the housing 12 is provided with a guide mounting groove 122 for the brake slider 32 to slide therein at the opening 121; the guide mounting groove 122 is formed with a first groove portion 1221 with a narrow groove width at a position away from the first meshing rack 31 and a second groove portion 1222 with a wider groove width at a position close to the first meshing rack 31; the groove width of the first groove portion 1221 is smaller than the width of the button body portion 321, so as to prevent the brake slider 32 from sliding excessively; the first groove portion 1221 is provided with a first side wall 12211 horizontally symmetrically arranged with the connecting portion 3213, and a corner portion 12212 extending from the first side wall 12211 to the groove of the second groove portion 1222, and the corner portion 12212 is rounded; one end of the spring 4 is connected to the connecting portion 3213, and the other end abuts against the first side wall 12211.

[0041] As described above, by setting the guide installation groove 122, the stable sliding of the brake slider is ensured, and the stability and accuracy of manual braking are further improved. The first groove 1221 is narrow, the second groove 1222 is wide, and the corner portion 12212 is matched to limit the movement stroke of the brake slider, prevent excessive sliding and excessive compression of the spring, and help to ensure the life of the spring. The corner portion 12212 is rounded, which is conducive to reducing the wear between the button body 321 when it slides to the corner portion 12212, and further improves the service life of the brake structure of this case.

[0042] like Figure 6 As shown, in a specific implementation, the contact portion 200 is an arc convex structure. In this way, the contact portion 200 with the arc convex structure can provide a smoother contact transition when the elliptical arc portion 100 of the rotating disk 1 contacts the micro switch, further reducing the impact and noise caused by direct collision, while also reducing the wear on the micro switch and extending its service life. Moreover, since the contact area of ​​the arc convex structure is large, more precise triggering can be achieved when contacting the micro switch. The smooth contact transition and precise triggering not only improve the reliability of the product, but also bring a more comfortable and smooth use experience to the user.

[0043] The working process of the braking structure in this case is as follows:

[0044] The external driver drives the external meshing rack to rotate, so that the second meshing rack 1121 rotates accordingly, thereby driving the rotating disk 1 to rotate; when the elliptical arc portion 100 of the rotating disk 1 rotates to the micro switch position, it vertically touches the contact portion of the micro switch, thereby triggering the micro switch. In addition, the user can also stop the rotating disk 1 by manually sliding the brake slider. It is also possible to let go when it is necessary to resume the rotation of the rotating disk 1, and the spring will automatically reset it without hindering the rotation of the rotating disk 1. Specifically, Figure 2 The brake mechanism on the left side is in a state where the rotating disk 1 does not touch the micro switch, and the brake mechanism on the right side is in a state where the rotating disk 1 vertically touches the contact portion of the micro switch.

[0045] As mentioned above, this case protects a braking mechanism for a micro switch, and all technical solutions that are the same or similar to this case should be deemed to fall within the protection scope of this case.

Claims

1. A brake mechanism for a micro switch, characterized in that: The invention comprises a rotating disk (1) and a micro switch (2) arranged on one side of the rotating disk (1), wherein the micro switch (2) is provided with a contact portion (200); the rotating disk (1) is provided with an outwardly protruding elliptical arc portion (100), and the elliptical arc portion (100) is used to touch the contact portion (200) by rotating and sliding; when the outermost point of the elliptical arc portion (100) touches the contact portion (200) of the micro switch (2), the connection line formed between the outermost point of the elliptical arc portion (100) and the center of the rotating disk (1) is perpendicular to the contact surface of the contact portion (200) of the micro switch (2).

2. A brake mechanism for a micro switch according to claim 1, characterized in that: Also includes: A manual brake structure for manually controlling a rotating disk (1) to stop rotating or resume rotating, the manual brake structure comprising: a first meshing rack (31) in an annular shape arranged on the inner peripheral wall of the rotating disk (1), a brake slider (32) capable of sliding under manual control, and a tooth-shaped protruding strip portion (33) arranged on the brake slider (32) and protruding in the direction of the first meshing rack (31); the tooth-shaped protruding strip portion (33) is inserted into a groove of the first meshing rack (31) when sliding outwards, thereby hindering the rotating disk (1) from rotating, and is released from the first meshing rack (31) when sliding inwards, thereby allowing the rotating disk (1) to resume rotating.

3. A brake mechanism for a micro switch according to claim 2, characterized in that: The rotating disk (1) comprises: a base (11) and a shell (12) fixedly connected to the base (11), the shell (12) covering the base (11) therein, the top of the base (11) being concave downwardly with a first groove (111), and the bottom being concave upwardly with a second groove (112), the side groove wall of the first groove (111) being protruding inwardly toward the center direction of the rotating disk (1) with the first meshing rack (31), the side groove wall of the second groove (112) being protruding inwardly toward the center direction of the rotating disk (1) with an annular second meshing rack (1121); the second meshing rack (1121) being meshed with an external meshing rack for transmission; the elliptical arc portion (100) being arranged on the shell (12).

4. A brake mechanism for a micro switch according to claim 3, characterized in that: The brake slider (32) is provided with a button body (321) and a protrusion (322) arranged on the top of the button body (321); the protrusion (322) is exposed from the rotating disk (1) to facilitate human touch; the housing (12) is provided with an opening (121) for exposing the protrusion (322); and the tooth-shaped protrusion (33) is protruding from the outer periphery of the button body (321).

5. The brake mechanism for a micro switch according to claim 4, characterized in that: The button body (321) is provided with a avoidance groove (3211) at a top position on one side thereof, which is capable of avoiding the first meshing rack (31) when the rotating disk (1) rotates, and the tooth-shaped protruding strip portion (33) is protruding on the side groove wall of the avoidance groove (3211).

6. A brake mechanism for a micro switch according to claim 5, characterized in that: The base (11) is recessed downward on the basis of the bottom groove wall of the first groove (111) to form a raised step portion (113) and a third groove (114); a screw hole (115) is provided on the bottom groove wall of the third groove (114), and a screw (116) is installed in the screw hole (115); the button body (321) is provided with a position avoidance support portion (3212) at the bottom position on the other side thereof, which can avoid the raised step portion (113) and can be placed on the bottom groove wall of the third groove (114).

7. A brake mechanism for a micro switch according to claim 6, characterized in that: A self-resetting structure is provided between the rotating disk (1) and the manual brake structure. The self-resetting structure is used to reset the toothed convex strip portion (33) and release it from the first meshing rack (31) when the brake slider (32) is released manually, thereby allowing the rotating disk (1) to resume rotation.

8. The brake mechanism for a micro switch according to claim 7, characterized in that: The self-resetting structure is a spring (4); a connecting portion (3213) is protrudingly provided on the outer side wall of the other side of the button main body (321); and the spring (4) is connected to the connecting portion (3213).

9. The brake mechanism for a micro switch according to claim 8, characterized in that: The housing (12) is provided with a guide installation groove (122) at the opening (121) for the brake slider (32) to slide therein; the guide installation groove (122) is formed with a first groove portion (1221) with a narrow groove width at a position away from the first meshing rack (31) and a second groove portion (1222) with a wider groove width at a position close to the first meshing rack (31); the groove width of the first groove portion (1221) is smaller than that of the button body portion (32 1), thereby preventing the brake slider (32) from sliding excessively; the first groove portion (1221) is provided with a first side wall (12211) horizontally symmetrically arranged with the connecting portion (3213), and a corner portion (12212) extending from the first side wall (12211) to the notch of the second groove portion (1222), and the corner portion (12212) is rounded; one end of the spring (4) is connected to the connecting portion (3213), and the other end is in contact with the first side wall (12211).

10. The brake mechanism for a micro switch according to claim 1, characterized in that: The contact portion (200) is a circular arc convex point structure.

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