High security doorknob lock structure
By designing a main lock hole and a secondary lock hole in the nanny lock to control the lock cylinder separately, and by using a safety buckle and guide groove to achieve multiple usage modes, the problem of cumbersome operation of existing nanny locks is solved, and the security and convenience are improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG WUYI WANLONG DOOR IND CO LTD
- Filing Date
- 2025-07-25
- Publication Date
- 2026-06-19
AI Technical Summary
Existing nanny locks are cumbersome to operate when both the main key and the secondary key are needed to lock, and cannot meet the needs of various usage scenarios.
A high-security nanny lock structure was designed, which controls the locking and unlocking of the first and second locking pins through the main lock hole and the auxiliary lock hole respectively, and limits the connecting bridge through the safety buckle to achieve a double insurance function. Combined with the movement of the guide groove and the guide pin, multiple usage modes can be realized.
It enables flexible use of master and secondary keys, applicable to various scenarios, and improves security and ease of operation.
Smart Images
Figure CN224379586U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of lock technology, and more specifically, to a high-security nanny lock structure. Background Technology
[0002] Door locks are commonly used anti-theft devices. To facilitate use in different scenarios, a type of lock with two keyholes, known as a nanny lock, is available on the market. It is generally equipped with two different keys, namely a main key and a secondary key. When the main key locks the door, the secondary key cannot open the door. When the main key is not locked, the secondary key can be used to unlock the door freely for convenient daily use. However, the current nanny lock has a relatively simple usage mode. Usually, after the main key is locked, the secondary key is no longer useful. When it is necessary to lock the door with both the main key and the secondary key at the same time to improve the anti-theft effect, the main key must be locked first and then the secondary key is locked, which is a rather cumbersome operation.
[0003] Therefore, a high-security nanny lock structure is needed to solve the above problems. Utility Model Content
[0004] The summary section of this application is intended to provide a brief overview of the concepts, which will be described in detail in the detailed description section below. This summary section is not intended to identify key or essential features of the claimed technical solutions, nor is it intended to limit the scope of the claimed technical solutions.
[0005] To address the technical problems mentioned in the background section, some embodiments of this application provide a high-security nanny lock structure, comprising: a lock body with a secondary lock hole and a main lock hole; a first lock pin, slidably mounted on the lock body; a second lock pin, slidably mounted on the lock body; a first linkage member, fixedly connected to the first lock pin and slidably mounted within the lock body; a second linkage member, fixedly connected to the second lock pin, with the sliding lock pin within the lock body; a first connecting bridge and a second connecting bridge, slidably mounted within the lock body, the second connecting bridge having a left end extending from the left side of the lock body, and the first connecting bridge having a right end extending from the right side of the lock body; and a fixed... A fixed post is fixedly installed inside the lock body; a second guide post is fixedly installed on the second linkage; a safety buckle is installed inside the lock body, the fixed post passes through the safety buckle, the safety buckle rotates around the axis of the fixed post, the safety buckle also has a first guide groove, the second guide post is embedded into the first guide groove and moves along the first guide groove; the lower end of the second connecting bridge is machined to form a raised edge and an embedding notch, one side of the raised edge forms a second stop edge protruding from the lower edge of the second connecting bridge, the lower end of the first connecting bridge is machined to form a first stop edge protruding from the lower edge of the first connecting bridge; one end of the safety buckle is provided with a limiting head that limits the first connecting bridge and the second connecting bridge through the first stop edge, the embedding notch, and the second stop edge.
[0006] The main lock hole controls the locking and unlocking of the second lock cylinder, while the secondary lock hole controls the locking and unlocking of the first lock cylinder, providing double security. A safety catch also limits the movement of the first and second connecting bridges, allowing the second linkage to limit their movement, which in turn limits the movement of the first linkage and the first lock cylinder, locking the first lock cylinder. Furthermore, the control of the first lock cylinder by the second lock cylinder makes this system suitable for various application scenarios.
[0007] Furthermore, a first guide post is fixedly connected to the first linkage member, and a second guide groove is provided on both the first bridge and the second bridge. The first guide post is embedded in the two second guide grooves and moves along the second guide grooves. When the first linkage member moves upward, it will drive the first bridge and the second bridge to move left and right through the first guide post and the second guide groove, so that the right end of the first bridge and the left end of the second bridge move away from each other; when the first linkage member moves downward, it will bring the right end of the first bridge and the left end of the second bridge closer together.
[0008] Furthermore, the first guide groove includes an extension section and an inclined section. The second guide post moves up and down, causing the safety buckle to deflect around the fixed post through the inclined section. When the second linkage is in the uppermost position, the second guide post is located at the top of the inclined section; when the second linkage is in the lowermost position, the second guide post is located inside the extension section.
[0009] When the second guide post moves to the uppermost position, i.e., the second locking post is in the locked state, the inclined section of the first guide post drives the safety buckle to deflect around the fixed post, causing the limit head to move upward and be in the limit state, thereby locking the first locking post.
[0010] Furthermore, a fixed platform is fixedly connected to the safety buckle, and a sliding post is provided on the fixed platform. The sliding post passes through the fixed platform and slides in cooperation with the fixed platform. A retaining ring is fixedly connected to one end of the sliding post, and a spring is provided between the retaining ring and the fixed platform. The two ends of the spring are fixedly connected to the fixed platform and the retaining ring, respectively.
[0011] With the fixed platform and spring, when the limiting head does not abut against the side of the second stop, the movement of the safety buckle will stretch the spring until the insertion notch moves to the position of the limiting head, so that the limiting head is inserted into the insertion notch.
[0012] Furthermore, a blocking strip extending around the sliding post is fixedly connected to the safety buckle. A collar is fitted on the sliding post, and a connecting rod is fixedly connected to the collar. A limiting head is fixedly set at the lower end of the connecting rod. The collar and the sliding post are rotatably engaged. A positioning screw is threaded onto the collar, and one end of the positioning screw abuts against the side wall of the sliding post to limit the collar.
[0013] The position of the limit head can be adjusted by rotating the sliding post and the collar, thus enabling two usage modes.
[0014] Furthermore, the blocking strip is located on the lower side of the collar, blocking the positioning screw. By rotating the collar, the positioning screw has a first position within the projection range of the blocking strip and a second position outside the projection range of the blocking strip.
[0015] By setting a collar and a stop bar, when the positioning screw is within the projection range of the stop bar, the stop bar can drive the limiting head to move. When the positioning screw is not within the projection range of the stop bar, the stop ring can be stretched.
[0016] Furthermore, the limiting head has a rectangular structure with a longer first side and a shorter second side. The width of the embedding notch is greater than the width of the second side, so that the limiting head can be embedded in the embedding notch.
[0017] By rotating the collar, the limiting head can be in two states. In the first state, the second side of the limiting head faces forward, and in the second state, the first side of the limiting head faces forward.
[0018] The beneficial effects of this application are as follows:
[0019] 1. The main lock hole controls the locking and unlocking of the second lock cylinder, while the secondary lock hole controls the locking and unlocking of the first lock cylinder, achieving double security. Simultaneously, the safety catch limits the movement of the first and second connecting bridges, allowing the second linkage to limit their movement, which in turn limits the movement of the first linkage and the first lock cylinder, locking the first lock cylinder. Furthermore, the control of the first lock cylinder by the second lock cylinder enables the system to be used in various scenarios.
[0020] 2. Through the first guide groove, when the second guide post moves to the uppermost side, i.e. the second locking post is in the locked state, the inclined section of the first guide groove drives the safety buckle to deflect around the fixed post, so that the limit head moves upward and is in the limit state, thereby locking the first locking post.
[0021] 3. With the fixed platform and spring, when the limiting head comes into contact with the lower end of the protruding edge, the movement of the safety buckle will stretch the spring until the insertion notch moves to the position of the limiting head, so that the limiting head is inserted into the insertion notch. Attached Figure Description
[0022] The accompanying drawings, which form part of this application, are used to provide a further understanding of the application and to make other features, objects, and advantages of the application more apparent. The illustrative embodiments and descriptions of this application are used to explain the application and do not constitute an undue limitation of the application.
[0023] Furthermore, throughout the accompanying drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and the elements are not necessarily drawn to scale.
[0024] In the attached diagram:
[0025] Figure 1 This is an overall schematic diagram according to one embodiment of the present application;
[0026] Figure 2 yes Figure 1 A schematic diagram of the internal structure of the lock body in the embodiment;
[0027] Figure 3 yes Figure 1 The installation diagram of the first linkage component in the embodiment is shown below;
[0028] Figure 4 yes Figure 1 A schematic diagram of the structure of the protruding edge in the embodiment;
[0029] Figure 5 yes Figure 1 A schematic diagram of the safety buckle in the embodiment;
[0030] Figure 6 yes Figure 1 The installation diagram of the safety buckle in the embodiment is shown below;
[0031] Figure 7 yes Figure 1 The installation diagram of the limiting head in the embodiment is shown below;
[0032] Figure 8 yes Figure 7 A magnified view of a portion of the image;
[0033] Figure 9 yes Figure 1 The embodiment is shown in the first mode, where both the first locking pin and the second locking pin are in a locked state.
[0034] Figure 10 yes Figure 1 The embodiment is a schematic diagram of a state in which the first locking pin is unlocked and the second locking pin is locked in the first mode;
[0035] Figure 11 yes Figure 1The embodiment is in a second mode where the first locking pin is unlocked and the second locking pin is locked.
[0036] Figure 12 yes Figure 1 The above embodiment is a schematic diagram showing that both the first and second locking pins are in a locked state in the second mode.
[0037] Figure label:
[0038] 10. Lock body; 11. Secondary lock hole; 12. Main lock hole; 13. First lock pin; 14. Second lock pin; 15. First linkage component; 16. Safety buckle; 17. Fixed pin; 18. First guide groove; 19. First guide pin; 20. Second guide pin; 21. First connecting bridge; 22. Second connecting bridge; 23. Second guide groove; 24. Embedded notch; 25. First stop edge; 26. Second stop edge; 27. Limiting head; 28. Fixed platform; 29. Sliding pin; 30. Retaining ring; 31. Spring; 32. Blocking strip; 33. Positioning screw; 34. Collar; 35. Protruding edge; 36. Second linkage component; 37. Angled section; 38. Extension section; 39. Connecting rod. Detailed Implementation
[0039] Embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. While some embodiments of this disclosure are shown in the drawings, it should be understood that this disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this disclosure. It should be understood that the accompanying drawings and embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure.
[0040] It should also be noted that, for ease of description, only the parts relevant to the application are shown in the accompanying drawings. Unless otherwise specified, the embodiments and features described in this disclosure can be combined with each other.
[0041] It should be noted that the concepts of "first" and "second" mentioned in this disclosure are used only to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units or their interdependencies.
[0042] It should be noted that the terms "a" and "a plurality of" used in this disclosure are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".
[0043] This disclosure will now be described in detail with reference to the accompanying drawings and embodiments.
[0044] Reference Figure 1-12, a high-security nanny lock structure, comprising: a lock body 10, a secondary lock hole 11, a main lock hole 12, a second lock pin 14, a first linkage 15, a second linkage 36, a first connecting bridge 21, a second connecting bridge 22, a fixing pin 17, a second guide pin 20, and a safety buckle 16. The lock body 10 has a secondary lock hole 11 and a main lock hole 12. The first lock pin 13 and the second lock pin 14 are slidably and telescopically mounted on the lock body 10. A lock cylinder is installed in both the secondary lock hole 11 and the main lock hole 12. The lock cylinder in the secondary lock hole 11 allows the first lock pin 13 to extend upwards to lock or retract downwards to unlock. The lock cylinder in the main lock hole 12 allows the second lock pin 14 to extend upwards to lock or retract downwards to unlock. The mounting structure and transmission structure of the lock cylinder, the second lock pin 14, and the first lock pin 13 are similar to those in existing lock technology. The first locking pin 13 is fixedly connected to a first linkage 15 that slides up and down within the lock body 10. When the first locking pin 13 is locked, the first linkage 15 moves upward; when the first locking pin 13 is unlocked, the first linkage 15 moves downward. The second locking pin 14 is fixedly connected to a second linkage 36 that slides within the lock body 10. When the second locking pin 14 is locked, the second linkage 36 moves upward; when the second locking pin 14 is unlocked, the second linkage 36 moves downward.
[0045] like Figure 2 - Figure 3 As shown, a first connecting bridge 21 and a second connecting bridge 22 are slidably disposed within the lock body 10. The second connecting bridge 22 has a left end extending from the left side of the lock body 10, and the first connecting bridge 21 has a right end extending from the right side of the lock body 10. A second guide groove 23 is provided on both the first connecting bridge 21 and the second connecting bridge 22. A first guide post 19 is fixedly connected to the first linkage member 15. The first guide post 19 is embedded in the second guide groove 23 and moves along the second guide groove 23. When the first locking post member 13 is locked, the first guide post 19 and the second guide groove 23 cause the right end of the first connecting bridge 21 and the left end of the second connecting bridge 22 to move away from each other; when the first locking post member 13 is unlocked, the right end of the first connecting bridge 21 and the left end of the second connecting bridge 22 move closer together.
[0046] like Figure 4As shown, a fixed post 17 is fixedly installed inside the lock body 10, and a safety buckle 16 is also installed inside the lock body 10. The fixed post 17 passes through the safety buckle 16, and the safety buckle 16 rotates around the axis of the fixed post 17. A second guide post 20 is fixedly connected to the second linkage 36. A first guide groove 18 is opened on the safety buckle 16. The second guide post 20 is embedded in the first guide groove 18 and moves. The first guide groove 18 includes an extension section 38 and an inclined section 37. The up and down movement of the second guide post 20 drives the safety buckle 16 to rotate around the fixed post 17 through the inclined section 37. When the second linkage 36 is in the uppermost position, that is, when the second lock post 14 is locked, the second guide post 20 is located at the top of the inclined section 37; when the second linkage 36 is in the lowermost position, that is, when the second lock post 14 is unlocked, the second guide post 20 is located in the extension section 38.
[0047] like Figure 4 - Figure 8 As shown, a limiting head 27 is provided on the safety buckle 16. The lower end of the second connecting bridge 22 is machined to form a raised edge 35 and an insertion notch 24. A second stop 26 protruding from the lower edge of the second connecting bridge 22 is formed on one side of the raised edge 35. The lower end of the first connecting bridge 21 is machined to form a first stop 25 protruding from the lower edge of the first connecting bridge 21. When the first locking pin 13 is in the locked state, the locking of the second locking pin 14 will drive the safety buckle 16 to move, so that the limiting head 27 is inserted into the insertion notch 24 to limit the second connecting bridge 22, thereby locking the first locking pin 13. After the limiting head 27 is inserted into the insertion notch 24, the limiting head 27 limits the first connecting bridge 21 through the second stop 25.
[0048] A fixed platform 28 is fixedly connected to the safety buckle 16. A sliding post 29 is provided on the fixed platform 28. The sliding post 29 passes through the fixed platform 28 and slides in cooperation with it. A retaining ring 30 is fixedly connected to one end of the sliding post 29. A spring 31 is provided between the retaining ring 30 and the fixed platform 28. The two ends of the spring 31 are fixedly connected to the fixed platform 28 and the retaining ring 30, respectively. A blocking strip 32 extending around the sliding post 29 is fixedly connected to the safety buckle 16. A collar 34 is fitted on the sliding post 29. A connecting rod 39 is fixedly connected to the collar 34. A limiting head 27 is fixedly located at the lower end of the connecting rod 39. The collar 34 rotates in cooperation with the sliding post 29. A positioning screw 33 is threadedly connected to the collar 34. One end of the positioning screw 33 abuts against the side wall of the sliding post 29 to limit the movement of the collar 34. The blocking strip 32 is located below the collar 34. The blocking strip 32 blocks the positioning screw 33. By rotating the collar 34, the positioning screw 33 has a first position within the projection range of the blocking strip 32 and a second position outside the projection range of the blocking strip 32. The limiting head 27 has a rectangular structure with a longer first side and a shorter second side. The width of the embedding notch 24 is larger than the width of the second side.
[0049] Specifically, by rotating the collar 34, the state of the limiting head 27 can be adjusted. In the first mode, when the second side of the limiting head 27 faces forward, the collar 34 is within the range of the blocking strip 32. At this time, the movement of the safety buckle 16 will push the collar 34 and the limiting head 27 through the blocking strip 32, and the spring 31 will not compress, ensuring that the limiting head 27 is embedded in the insertion groove 24. In the second mode, when the first side of the limiting head 27 faces forward, the positioning screw 33 is no longer within the range of the blocking strip 32. The spring 31 can be compressed.
[0050] When switched to the first mode, if the first locking pin 13 is locked and the second locking pin 14 needs to be locked, the limiting head 27 will be inserted into the embedding notch 24 under the action of the safety catch 16, limiting the second connecting bridge 22 and preventing the first locking pin 13 from being unlocked through the secondary lock hole 11. If the first locking pin 13 is unlocked and the second locking pin 14 is locked, the limiting head 27 will abut against the lower end of the second connecting bridge 22. At this time, the second stop 26 will abut against the limiting head 27 to block the movement of the second connecting bridge 22, preventing the first locking pin 13 from being locked through the secondary lock hole 11. The first mode is suitable when the holder of the key in the main lock hole 12 does not want to operate the first locking pin 13 after locking the second locking pin 14.
[0051] When switched to the second mode, if the first locking pin 13 is locked and the second locking pin 14 needs to be locked, the limiting head 27 will be inserted into the embedding notch 24 under the action of the safety buckle 16, limiting the second connecting bridge 22 and preventing the first locking pin 13 from being unlocked through the secondary locking hole 11. If the first locking pin 13 is unlocked and the second locking pin 14 is locked, the limiting head 27 will abut against the lower end of the protruding edge 35 and will not be inserted into the embedding notch 24. At this time, the spring 31 will be stretched, and the limiting head 27 can slide at the lower end of the protruding edge 35 until the first locking pin 13 is locked through the secondary locking hole 11. This causes the second connecting bridge 22 to move, so that the embedding notch 24 moves to the position of the limiting head 27. Under the action of the spring 31, the limiting head 27 continues to be inserted into the embedding notch 24, limiting the second connecting bridge 22, and then the first locking pin 13 can no longer be opened through the secondary locking hole 11. The second mode is applicable when the holder of the key in the main lock 12 wants to continue locking and reinforcing the first lock 13 after the second lock pin 14 is locked, thus ensuring security.
[0052] Working process or usage method:
[0053] 1. When the first locking pin 13 is not to be operated after the second locking pin 14 is locked, the limiting head 27 is adjusted to the first state by rotating the collar 34, and the collar 34 is fixed by the positioning screw 33. If the first locking pin 13 is locked, when locking the second locking pin 14, the limiting head 27 will be embedded in the embedding notch 24 under the action of the safety buckle 16, limiting the second connecting bridge 22, and preventing the first locking pin 13 from being unlocked through the secondary lock hole 11. If the first locking pin 13 is unlocked, when locking the second locking pin 14, the limiting head 27 will abut against the lower end of the second connecting bridge 22. At this time, the second stop 26 will abut against the limiting head 27 to block the movement of the second connecting bridge 22, and the first locking pin 13 cannot be locked through the secondary lock hole 11. The first mode is applicable when the first locking pin 13 is not to be operated after the second locking pin 14 is locked.
[0054] 2. When the first lock pin 13 can still be locked for reinforcement after the second lock pin 14 is locked to ensure security, if the first lock pin 13 is locked and the second lock pin 14 is locked, the limiting head 27 will be embedded into the embedding notch 24 under the action of the safety buckle 16, limiting the second connecting bridge 22, and the first lock pin 13 cannot be unlocked through the secondary lock hole 11. If the first locking pin 13 is in the unlocked state, when locking the second locking pin 14, the limiting head 27 will abut against the lower end of the protruding edge 35. At this time, the spring 31 will be stretched until the first locking pin 13 is locked through the secondary locking hole 11. This will cause the second connecting bridge 22 to move, so that when the embedding notch 24 moves to the position of the limiting head 27, the limiting head 27 will continue to be embedded in the embedding notch 24 by the action of the spring 31, limiting the second connecting bridge 22. Then, the first locking pin 13 can no longer be opened through the secondary locking hole 11. At this time, the first locking pin 13 can only be unlocked after the second locking pin 14 is unlocked.
[0055] The above description is merely a selection of preferred embodiments of this disclosure and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the application involved in the embodiments of this disclosure is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described application concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features with similar functions disclosed in the embodiments of this disclosure.
Claims
1. A high-security nanny lock structure, characterized in that, include: The lock body (10) has a secondary lock hole (11) and a main lock hole (12). The first locking pin (13) is slidably mounted on the lock body (10) for vertical extension and retraction; The second locking pin (14) is slidably mounted on the lock body (10) for vertical extension and retraction; The first linkage (15) is fixedly connected to the first locking pin (13) and is slidably disposed inside the lock body (10); The second linkage (36) is fixedly connected to the second locking pin (14), and the sliding locking pin is inside the lock body (10); The first connecting bridge (21) and the second connecting bridge (22) are slidably disposed inside the lock body (10). The second connecting bridge (22) has a left end extending out of the left side of the lock body (10), and the first connecting bridge (21) has a right end extending out of the right side of the lock body (10). A fixed post (17) is fixedly installed inside the lock body (10); The second guide post (20) is fixedly mounted on the second linkage component (36); The safety buckle (16) is set inside the lock body (10). The fixing post (17) passes through the safety buckle (16). The safety buckle (16) rotates around the axis of the fixing post (17). The safety buckle (16) is also provided with a first guide groove (18). The second guide post (20) is embedded in the first guide groove (18) and moves along the first guide groove (18). The lower end of the second connecting bridge (22) is machined to form a protruding edge (35) and an embedded notch (24). A second stop (26) protruding from the lower edge of the second connecting bridge (22) is formed on one side of the protruding edge (35). The lower end of the first connecting bridge (21) is machined to form a first stop (25) protruding from the lower edge of the first connecting bridge (21). The safety buckle (16) is provided with a limiting head (27) at one end, which limits the first connecting bridge (21) and the second connecting bridge (22) by means of the first stop (25), the embedded notch (24) and the second stop (26).
2. The high-security nanny lock structure according to claim 1, characterized in that: A first guide post (19) is fixedly connected to the first linkage member (15). A second guide groove (23) is provided on both the first bridge (21) and the second bridge (22). The first guide post (19) is embedded in the two second guide grooves (23) and moves along the second guide grooves (23). When the first linkage member (15) moves upward, it will drive the first bridge (21) and the second bridge (22) to move left and right through the first guide post (19) and the second guide groove (23), so that the right end of the first bridge (21) and the left end of the second bridge (22) move away from each other. When the first linkage member (15) moves downward, it will make the right end of the first bridge (21) and the left end of the second bridge (22) move closer.
3. The high-security nanny lock structure according to claim 2, characterized in that: The first guide groove (18) includes an extension section (38) and an inclined section (37). The second guide post (20) moves up and down through the inclined section (37) to drive the safety buckle (16) to deflect around the fixed post (17). When the second linkage member (36) is in the uppermost position, the second guide post (20) is located at the top of the inclined section (37); when the second linkage member (36) is in the lowermost position, the second guide post (20) is located inside the extension section (38).
4. The high-security nanny lock structure according to claim 3, characterized in that: A fixed platform (28) is fixedly connected to the safety buckle (16). A sliding post (29) is provided on the fixed platform (28). The sliding post (29) passes through the fixed platform (28) and slides with the fixed platform (28). A retaining ring (30) is fixedly connected to one end of the sliding post (29). A spring (31) is connected between the retaining ring (30) and the fixed platform (28). The two ends of the spring (31) are fixedly connected to the fixed platform (28) and the retaining ring (30) respectively.
5. The high-security nanny lock structure according to claim 4, characterized in that: A blocking strip (32) extending around the sliding post (29) is fixedly connected to the safety buckle (16). A collar (34) is sleeved on the sliding post (29). A connecting rod (39) is fixedly connected to the collar (34). A limiting head (27) is fixedly set at the lower end of the connecting rod (39). The collar (34) rotates with the sliding post (29). A positioning screw (33) is threaded on the collar (34). One end of the positioning screw (33) abuts against the side wall of the sliding post (29) to limit the collar (34).
6. The high-security nanny lock structure according to claim 5, characterized in that: The blocking strip (32) is located below the collar (34). The blocking strip (32) blocks the positioning screw (33). By rotating the collar (34), the positioning screw (33) has a first position within the projection range of the blocking strip (32) and a second position outside the projection range of the blocking strip (32).
7. The high-security nanny lock structure according to claim 1, characterized in that: The limiting head (27) is a rectangular structure with a longer first side and a shorter second side. The width of the embedding notch (24) is greater than the width of the second side, so that the limiting head (27) is embedded in the embedding notch (24).