Bistable push-on mechanical self-latching switch

Abstract

The application discloses a kind of bistable press type mechanical self-locking switch, including mounting seat, plug-in rod, press lever, press handle, reset compression spring and limit ball, mounting seat is equipped with mounting seat through-hole, plug-in rod passes through mounting seat through-hole, plug-in rod is equipped with plug-in rod center through-hole, plug-in rod center through-hole is sequentially first section through-hole, second section through-hole, third section through-hole and fourth section through-hole, the hole wall of fourth section through-hole is equipped with taper through-hole along circumference, the circumferential hole wall of mounting seat through-hole is equipped with ring groove, press lever is located in plug-in rod center through-hole, one end of reset compression spring and press handle contact, the other end and the step between second section through-hole and third section through-hole contact, taper section and cylindrical section are equipped on press lever, limit ball is placed in taper through-hole.The application realizes the self-locking function of plug-in rod in insertion and pull-out two states, i.e., realizes bistable self-locking function, can effectively prevent adverse consequences caused by misoperation.

Description

Technical Field

[0001] This invention relates to a self-locking switch, and more particularly to a bistable push-button mechanical self-locking switch that is self-locking both when inserted and when removed. Background Technology

[0002] Commonly used self-locking switches are switches used for electrical connection and disconnection. They are mostly push-button switches, which connect the two poles of the switch when the button is pressed and disconnect the two poles when the button is released. They are commonly used for switching control of various electrical equipment.

[0003] However, in certain specific applications, a mechanical self-locking switch is required that can lock itself both when inserted and when removed. The purpose is to lock itself after insertion to prevent arbitrary removal, and to lock itself after removal to prevent arbitrary insertion, thereby preventing adverse results from misoperation. This situation cannot be accomplished with existing self-locking switches.

[0004] For example, during emergency oxygen therapy on board, the oxygen cylinders are located in a specific area of ​​the aircraft, while the person administering the oxygen (such as the captain) is in another specific location, with a certain distance between them. To allow the person administering the oxygen to operate the cylinders without getting up, a flexible connection, such as a steel wire, is needed to connect the operating handle to the pressure relief valve on the oxygen cylinder. The person administering the oxygen can then control the pressure relief valve by operating the handle next to them. This operating handle is typically connected to the mounting base via a plug-in method, and its control action involves inserting and removing it. In this control method, a metastable state needs to be maintained in both the open and closed states, i.e., a self-locking function is required to ensure the reliability of the pressure relief valve in both open and closed states and to prevent accidental changes in the switching state due to misoperation. This practical requirement cannot be met by the aforementioned self-locking switch or other existing mechanical switches. Summary of the Invention

[0005] The purpose of this invention is to provide a bistable push-button mechanical self-locking switch that can self-lock during both insertion and removal in order to solve the above-mentioned problems.

[0006] The present invention achieves the above objectives through the following technical solutions:

[0007] A bistable push-button mechanical self-locking switch includes a mounting base, a plug-in rod, a pressing rod, a pressing handle, a return spring, and a limiting ball. The mounting base has a mounting base through hole, through which the plug-in rod passes and fits tightly, allowing axial sliding. A first end of the plug-in rod protrudes outwards to form a handle. The plug-in rod has a central through hole, which, from the first end to the second end, consists of a first section, a second section, a third section, and a fourth section. The diameter of the first section is larger than the diameter of the second section. The diameter of the three through holes is smaller than that of the second and fourth through holes. One or more radially tapered through holes are provided circumferentially on the wall of the fourth through hole. The outer diameter of the tapered through hole is smaller than its inner diameter. An annular groove is provided on the circumferential wall of the mounting base through hole at a position corresponding to the tapered through hole, and the width of the annular groove is the same as the outer diameter of the tapered through hole. The pressing rod is located within the central through hole of the insertion / extraction rod and is tightly fitted with the wall of the third through hole, allowing for axial sliding. The first end of the pressing rod is connected to the pressing handle, which is placed within the first through hole. The resetting spring is placed inside the first and second through holes. One end of the resetting spring contacts the pressing handle, and the other end contacts the step between the second and third through holes. A pressing rod retaining ring protruding outwards is provided near the second end of the pressing rod. The retaining ring contacts the step between the third and fourth through holes. A section of the pressing rod's outer wall between the retaining ring and the second end is tapered, forming a tapered section. The outer diameter of the tapered section near the retaining ring is smaller than the outer diameter of the other end. The outer wall between the tapered section and the second end face is cylindrical, forming a cylindrical section. The outer diameter of the cylindrical section is the same as the outer diameter of the large end of the tapered section. The pressing rod retaining ring, the tapered section, and the cylindrical section are all placed inside the fourth through hole. The cylindrical section is tightly fitted with the hole wall of the fourth through hole and can slide axially. The transition part between the tapered section and the cylindrical section corresponds to the position of the tapered through hole. One or more limiting balls are placed inside the tapered through hole. The diameter of the limiting ball is larger than the outer end diameter of the tapered through hole, and the wall thickness of the fourth through hole is smaller than the diameter of the limiting ball.

[0008] Preferably, in order to have a blocking component to ensure that the insertion rod is inserted into the mounting base quickly and accurately, the outer wall of the insertion rod is provided with an insertion rod protrusion ring that protrudes outward in the circumferential direction at a position between the insertion rod handle and the tapered through hole. The insertion rod protrusion ring contacts the corresponding end or step of the mounting base.

[0009] Preferably, to facilitate the assembly of the components within the plug-in rod and the connection of the plug-in rod to the controlled object, the bistable push-button mechanical self-locking switch further includes a connecting rod. The first end of the connecting rod has an axial blind hole with an internal thread on its wall. A section of the plug-in rod near the second end has a reduced outer diameter and an external thread on its outer wall, which connects to the internal thread of the connecting rod. The outer diameter of a section of the connecting rod near its first end is the same as the outer diameter of the plug-in rod. The second end of the connecting rod has a connecting hole.

[0010] Preferably, in order to have a blocking component to ensure that the plug-in rod is pulled out of the mounting base quickly and accurately, a connecting rod retaining ring protruding outward in the outer wall of the middle section of the connecting rod is provided. The connecting rod retaining ring can contact the corresponding step or end of the mounting base after the plug-in rod is pulled out of the base.

[0011] Preferably, in order to facilitate the limiting of the connecting parts such as steel wires connected to the controlled object and to facilitate the covering of the connection parts for aesthetic purposes, the bistable push-button mechanical self-locking switch also includes a connecting rod cover. The connecting rod cover has a blind hole with an internal thread on the hole wall. The bottom of the blind hole of the connecting rod cover has an outer cover through hole. The outer wall of the connecting rod near the second end has an external thread and is connected to the internal thread of the connecting rod cover through the external thread.

[0012] Preferably, in order to provide an electronic signal when the self-locking switch is activated so that the user can more accurately understand the switch status, the bistable push-button mechanical self-locking switch also includes a micro switch. The micro switch is mounted on the mounting base and close to the connecting rod cover. The moving contact of the micro switch can contact the connecting rod or the connecting rod cover during the operation of the connecting rod.

[0013] The beneficial effects of this invention are as follows:

[0014] This invention, through the design of a mutually cooperating mounting base, insertion / removal rod, pressing rod, pressing handle, return spring, and limiting ball, ensures that when the pressing rod is pressed against the second end of the insertion / removal rod, the limiting ball is fully positioned within the rod, without affecting the insertion and removal of the rod. This allows for smooth insertion or removal. Upon releasing the pressing handle, the return spring pushes the pressing handle and pressing rod towards the first end of the rod, causing the limiting ball to be pushed outward by the tapered section of the pressing rod and partially positioned outside the rod. If the insertion / removal rod is in the insertion position at this time... When the rod is in the inserted / extracted state, the limiting ball is located in the annular groove of the mounting base, and the insertion / extraction lever cannot be pulled out. If the rod is in the extracted state, the limiting ball is located outside the corresponding end of the mounting base, and the insertion / extraction lever cannot be inserted. This achieves the self-locking function of the insertion / extracting lever in both inserted and extracted states, i.e., it achieves the bistable self-locking function. The user cannot change the existing state of the insertion / extracting lever without pressing down the handle, ensuring that it can self-lock after insertion and prevent arbitrary extraction, and self-lock after extraction and prevent arbitrary insertion. This effectively prevents adverse results caused by misoperation. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the main cross-sectional structure of the bistable push-button mechanical self-locking switch described in this invention;

[0016] Figure 2 This is a schematic diagram of the main cross-sectional structure of the plug-in rod of the bistable push-button mechanical self-locking switch described in this invention;

[0017] Figure 3 This is a schematic diagram of the main cross-sectional structure of the bistable push-button mechanical self-locking switch of the present invention after assembly of the plug-in rod, push rod, push handle, reset spring and limiting ball.

[0018] Figure 4 This is a schematic diagram of the main structure of the bistable push-button mechanical self-locking switch described in this invention. The bistable push-button mechanical self-locking switch in the figure is a cross-sectional view and its scale relative to the oxygen tank is larger than that of the actual product. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings:

[0020] like Figures 1-3As shown, the bistable push-button mechanical self-locking switch of the present invention includes a mounting base 5, a plug-in rod 1, a pressing rod 4, a pressing handle 2, a reset spring 3, and a limiting ball 6. The mounting base 6 has a mounting base through hole. The plug-in rod 1 passes through the mounting base through hole and fits tightly, and can slide axially. The first end of the plug-in rod 1 protrudes outward in the circumferential direction to form a plug-in rod handle 10. The plug-in rod 1 has a central through hole. The central through hole of the plug-in rod 1 consists of a first through hole 11, a second through hole 12, a third through hole 13, and a fourth through hole 16, from the first end to the second end of the two ends. The diameter of the first through hole 11 is larger than the diameter of the second through hole 12, and the diameter of the third through hole 13 is larger than the diameter of the fourth through hole 16. The diameter of hole 13 is smaller than the diameters of the second through hole 12 and the fourth through hole 16. One or more (two shown in the figure) radially tapered through holes 15 are provided circumferentially on the wall of the fourth through hole 16. The outer diameter of the tapered through hole 15 is smaller than its inner diameter. An annular groove 50 is provided on the circumferential wall of the mounting base through hole at a position corresponding to the tapered through hole 15, and the width of the annular groove 50 is the same as the outer diameter of the tapered through hole 15. The pressing rod 4 is located in the central through hole of the insertion / extraction rod and is tightly fitted with the wall of the third through hole 13, allowing it to slide axially. The first end of the pressing rod 4 is threadedly connected to the pressing handle 2. The pressing handle 2 is placed inside the first through hole 11. The maximum outer diameter is slightly smaller than the diameter of the first through hole 11. The reset spring 3 is placed inside the first through hole 11 and the second through hole 12. One end of the reset spring 4 contacts the pressing handle 2, and the other end contacts the step between the second through hole 12 and the third through hole 13. A pressing rod retaining ring 40 protruding outward is provided on the pressing rod 4 near the second end of its two ends. The pressing rod retaining ring 40 contacts the step between the third through hole 13 and the fourth through hole 16. The outer wall of the pressing rod 4 between the pressing rod retaining ring 40 and the second end is tapered, forming a tapered section 41. The outer diameter of the tapered section 41 near the pressing rod retaining ring 40 is smaller than the outer diameter of the other end. The outer wall between the tapered section 41 and the second end face is cylindrical, forming a cylindrical section 42. The outer diameter of the cylindrical section 42 is the same as the outer diameter of the large end of the tapered section 41. The pressing rod retaining ring 40, the tapered section 41, and the cylindrical section 42 are all placed in the fourth through hole 16. The cylindrical section 42 is tightly fitted with the hole wall of the fourth through hole 16 and can slide axially. The transition part between the tapered section 41 and the cylindrical section 42 corresponds to the position of the tapered through hole 15. One or more (two are shown in the figure) limiting balls 6 are placed in the tapered through hole 15. The diameter of the limiting balls 6 is larger than the outer end diameter (i.e., the small end diameter) of the tapered through hole 15. The hole wall thickness of the fourth through hole 16 is smaller than the diameter of the limiting balls 6.

[0021] like Figures 1-3 As shown, the present invention also discloses the following more optimized specific structures. According to actual needs, the above structures can be superimposed and combined with one or more of the following structures to form a more optimized technical solution.

[0022] In order to have a blocking component to ensure that the insertion rod 1 is inserted into the mounting base 5 so as to facilitate the insertion action quickly and accurately, the outer wall of the insertion rod 1 is provided with an insertion rod protrusion ring 14 that protrudes outward in the circumferential direction at the position between the insertion rod handle 10 and the tapered through hole 15. The insertion rod protrusion ring 14 contacts the corresponding end (or the corresponding step) of the mounting base 5, at which time the insertion rod 1 is in the inserted state.

[0023] To facilitate the assembly of the components within the plug-in rod 1 and the connection of the plug-in rod 1 to the controlled object, the bistable push-button mechanical self-locking switch further includes a connecting rod 7. The first end of the connecting rod 7 has an axial blind hole with an internal thread on the hole wall. The outer diameter of a section of the plug-in rod 1 near the second end is reduced, and the outer wall of this section has an external thread that connects to the internal thread of the connecting rod 7 through the external thread. The outer diameter of a section of the connecting rod 7 near its first end is the same as the outer diameter of the plug-in rod 1. The second end of the connecting rod 7 has a connecting hole 71.

[0024] In order to have a blocking component to ensure that the insertion rod 1 is pulled out of the mounting base quickly and accurately, a connecting rod retaining ring 70 protruding outward in the circumferential direction is provided on the outer wall of the middle section of the connecting rod 7. The connecting rod retaining ring 70 can contact the corresponding step (or the corresponding end) of the mounting base 5 after the insertion rod 1 is pulled out to the correct position.

[0025] To facilitate the connection of the connecting parts to the controlled object, such as steel wire (see...) Figure 4 The steel wire 90 is used for limiting and to cover the connection part for aesthetic purposes. The bistable push-type mechanical self-locking switch also includes a connecting rod cover 72. The connecting rod cover 72 is provided with a blind hole and the wall of the blind hole is provided with an internal thread. The bottom of the blind hole of the connecting rod cover 72 is provided with an outer cover through hole 73. The outer wall of the connecting rod 7 near the second end is provided with an external thread and is connected to the internal thread of the connecting rod cover 72 through the external thread.

[0026] In order to provide an electronic signal when the self-locking switch is activated so that the user can more accurately understand the switch status, the bistable push-button mechanical self-locking switch also includes a micro switch 8. The micro switch 8 is mounted on the mounting base 5 and close to the connecting rod cover 72. The moving contact of the micro switch 8 can contact the connecting rod 7 or the connecting rod cover 72 during the operation. If the moving contact of the micro switch 8 is in contact with the connecting rod 7, the moving contact needs to pass through the corresponding through hole on the connecting rod cover 72.

[0027] like Figures 1-3As shown, during assembly, first place multiple limiting balls 6 into multiple tapered through holes 15 and bring them close to the outer end of the tapered through holes 15 (for the lower limiting balls 6, their own weight can achieve this purpose; for the limiting balls 6 in other parts, this purpose can be achieved by suction from the outside, etc.). Then, insert the first end of the pressing rod 4 into the second end of the insertion rod 1, and align the middle section of the pressing rod 4 with the third through hole 13 until the pressing rod retaining ring 40 contacts the step between the third through hole 13 and the fourth through hole 16. Then, fit the reset spring 3 onto the section of the pressing rod 4 near the first end, and connect the pressing handle 2. The first end of the push rod 4 is screwed on and tightened. Under the action of the reset spring 3, the push rod 4 has a stress that moves towards the first end of the insertion rod 1. Then, the connecting rod 7 is connected to the second end of the insertion rod 1 by thread, and the micro switch 8 is installed on the corresponding position on the mounting base 5. Finally, the push handle 2 is pressed down and the insertion rod 1 is inserted into the through hole of the mounting base 5, so that the insertion rod protrusion ring 14 contacts the corresponding end of the mounting base 5. At this time, the insertion rod 1 is in the inserted position. Then, the push handle 2 is released, and part of the limiting ball 6 enters the annular groove 50 of the mounting base 5 to maintain the locked state, thus completing the assembly of the entire bistable push-type mechanical self-locking switch.

[0028] like Figures 1-4 As shown, the following is a detailed description of its usage process, taking the oxygen supply switch 91 of the pressure reducing valve 92 of the oxygen tank 93 for aviation as an example: The mounting base 5 is fixedly installed next to the pilot's seat. The axis of the plug-in rod 1 after installation can be in any direction. The figure shows the horizontal direction, but it can also be in other directions. In actual application, it is more reasonable to be in the vertical direction. Pass one end of the steel wire 90 through the outer cover through hole 73 of the connecting rod cover 72 and then connect it to the connecting rod 7 through the connecting hole 71. Then connect the connecting rod 7 and the plug-in rod 1 with threads. Connect the other end of the steel wire 90 to the oxygen supply switch 91 of the pressure reducing valve 92 of the oxygen tank 93. This completes the connection between the self-locking switch and the controlled object. At this time, the oxygen supply switch 91 is in the closed state.

[0029] When the pilot needs emergency oxygen, he presses down the handle 2, pressing the lever 4 against the second end of the insertion / removal lever 1. At this time, the limiting ball 6 can be fully placed inside the insertion / removal lever 1. Then, the insertion / removal lever 1 is pulled outward (Note: this pulling out is not pulling the insertion / removal lever 1 completely out of the mounting base 5, but only a relative pulling action). At this time, the limiting ball 6 naturally disengages from the annular groove 50 of the mounting base 5 and fully enters the tapered through hole 15 and the fourth through hole 16 of the insertion / removal lever 1. The insertion / removal lever 1 can be smoothly pulled out until the connecting rod retaining ring 70 contacts the corresponding step of the mounting base 5. At this time, it is pulled out in place. Then, the press handle 2 is released, and the reset spring 3 pushes the press handle 2 and the press rod 4 towards the first end of the insertion rod 1. The limiting ball 6 is pushed outward by the conical section 41 of the press rod 4 and partially placed outside the insertion rod 1, realizing the self-locking function when pulled out. At the same time, the insertion rod 1 drives the connecting rod 7 and the connecting rod cover 72 to move synchronously, thereby driving the oxygen supply switch 91 to open the pressure reducing valve 92 of the oxygen tank 93 through the steel wire 90, so that the pilot can achieve the purpose of oxygen inhalation. At the same time, the micro switch 8 is activated, giving an electrical signal to keep the pilot in the oxygen supply state until this time. During oxygen inhalation, if the pilot accidentally applies pressure directly to the insertion rod handle 10, the limiting ball 6 cannot be fully inserted into the insertion rod 1 because it is blocked by the conical section 41 and the cylindrical section of the press rod 4. Therefore, it will block the corresponding end of the mounting base 5, and the insertion rod 1 cannot be inserted into the mounting base 5, thus achieving the purpose of preventing accidental operation.

[0030] When the pilot needs to stop emergency oxygen administration and close the oxygen supply switch 91 of the pressure reducing valve 92, he presses down the handle 2 by hand, pressing the lever 4 against the second end of the insertion rod 1. At this time, the limiting ball 6 can be fully placed inside the insertion rod 1. Then, the insertion rod 1 is inserted into the mounting base 5. At this time, the limiting ball 6 naturally disengages from the annular groove 50 of the mounting base 5 and fully enters the tapered through hole 15 and the fourth through hole 16 of the insertion rod 1. The insertion rod 1 can be smoothly inserted until the protruding ring 14 of the insertion rod contacts the corresponding end of the mounting base 5. At this time, it is fully inserted. Then, the handle is released. 2. The reset spring 3 pushes the pressing handle 2 and the pressing rod 4 towards the first end of the insertion / removal rod 1. The limiting ball 6 is pushed outward by the tapered section 41 of the pressing rod 4 and partially placed in the annular groove 50 of the mounting base 5, realizing the self-locking function when inserted. At the same time, the insertion / removal rod 1 drives the connecting rod 7 and the connecting rod cover 72 to move synchronously. The steel wire 90 is activated by the stress of the oxygen supply switch 91, closing the pressure reducing valve 92 of the oxygen tank 93. At the same time, the micro switch 8 is activated, giving an electrical signal to ensure that the pilot is in the oxygen-off state until this time. After closing, if the pilot accidentally applies pressure to the insertion / removal rod handle 10, the limiting ball 6 cannot fully enter the insertion / removal rod 1 because it is blocked by the tapered section 41 and the cylindrical section of the pressing rod 4. Therefore, it will be blocked by the annular groove 50 of the mounting base 5, and the insertion / removal rod 1 cannot be pulled out of the mounting base 5, thus achieving the purpose of preventing accidental operation.

[0031] In other practical applications, the 90mm steel wire can be used for other rigid connection components, and its working principle is similar to that above.

[0032] The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the technical solutions of the present invention. Any technical solution that can be implemented based on the above embodiments without creative effort should be considered to fall within the scope of protection of the patent of the present invention.

Claims

1. A bistable push-button mechanical self-locking switch, characterized in that: The assembly includes a mounting base, a plug-in rod, a pressing rod, a pressing handle, a return spring, and a limiting ball. The mounting base has a through hole, through which the plug-in rod passes and fits tightly, allowing for axial sliding. One end of the plug-in rod protrudes outwards to form a handle. The plug-in rod has a central through hole, which, from the first end to the second end, consists of a first section, a second section, a third section, and a fourth section. The diameter of the first section is larger than that of the second section, and the diameter of the third section is smaller than that of the fourth section. The diameters of the second and fourth through holes are specified. One or more radially tapered through holes are provided circumferentially on the wall of the fourth through hole. The outer diameter of the tapered through hole is smaller than its inner diameter. An annular groove is provided on the circumferential wall of the mounting base through hole at a position corresponding to the tapered through hole, and the width of the annular groove is the same as the outer diameter of the tapered through hole. The pressing rod is located within the central through hole of the insertion / extraction rod and is tightly fitted with the wall of the third through hole, allowing axial sliding. The first end of the pressing rod is connected to the pressing handle, which is placed within the first through hole. The reset spring is placed within the second through hole. Within the first and second through holes, one end of the reset spring contacts the pressing handle, and the other end contacts the step between the second and third through holes. A pressing rod retaining ring protruding outwards is provided near the second end of the pressing rod. The retaining ring contacts the step between the third and fourth through holes. A section of the outer wall of the pressing rod between the retaining ring and the second end is tapered, forming a conical section. The outer diameter of the conical section near the retaining ring is smaller than the outer diameter of the other end. The outer wall between the second end faces is cylindrical, forming a cylindrical segment. The outer diameter of the cylindrical segment is the same as the outer diameter of the large end of the tapered segment. The pressing rod retaining ring, the tapered segment, and the cylindrical segment are all placed inside the fourth through hole. The cylindrical segment fits tightly with the hole wall of the fourth through hole and can slide axially. The transition part between the tapered segment and the cylindrical segment corresponds to the position of the tapered through hole. One or more limiting balls are placed inside the tapered through hole. The diameter of the limiting ball is larger than the outer end diameter of the tapered through hole, and the wall thickness of the fourth through hole is smaller than the diameter of the limiting ball.

2. The bistable push-button mechanical self-locking switch according to claim 1, characterized in that: The outer wall of the insertion rod is provided with an insertion rod protrusion ring that protrudes outward in the circumferential direction at a position between the insertion rod handle and the tapered through hole. The insertion rod protrusion ring contacts the corresponding end or step of the mounting base.

3. The bistable push-button mechanical self-locking switch according to claim 1 or 2, characterized in that: The bistable push-button mechanical self-locking switch also includes a connecting rod. The first end of the connecting rod has an axial blind hole with an internal thread on the wall of the blind hole. The outer diameter of a section of the plug-in rod near the second end is reduced, and the outer wall of this section has an external thread that connects to the internal thread of the connecting rod. The outer diameter of a section of the connecting rod near its first end is the same as the outer diameter of the plug-in rod. The second end of the connecting rod has a connecting hole.

4. The bistable push-button mechanical self-locking switch according to claim 3, characterized in that: The middle section of the connecting rod is provided with a connecting rod retaining ring that protrudes outward in the circumferential direction. The connecting rod retaining ring can contact the corresponding step or end of the mounting base after the plug-in rod is pulled out into place.

5. The bistable push-button mechanical self-locking switch according to claim 3, characterized in that: The bistable push-button mechanical self-locking switch also includes a connecting rod cover, the connecting rod cover having a blind hole with an internal thread on the hole wall, the bottom of the blind hole of the connecting rod cover having an outer cover through hole, and an external thread on the outer wall of the connecting rod near the second end, which is connected to the internal thread of the connecting rod cover through the external thread.

6. The bistable push-button mechanical self-locking switch according to claim 5, characterized in that: The bistable push-button mechanical self-locking switch also includes a micro switch, which is mounted on the mounting base and close to the connecting rod cover. The moving contact of the micro switch can contact the connecting rod or the connecting rod cover during its movement.

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