synchronous closing mechanism

Abstract

The application discloses a synchronous closing mechanism and belongs to the technical field of baby furniture. The synchronous closing mechanism comprises an opening and closing piece and a movable piece. The opening and closing piece is provided with a connecting body one and a connecting body two in opposite arrangement. An opening and closing body is movably arranged on the connecting body one and the connecting body two. Part of the movable piece is movably arranged between the connecting body one and the connecting body two. The movable piece is connected with the opening and closing body. When the movable piece moves along the arrangement direction of the connecting body, the opening and closing body is synchronously driven to open or close the connecting body one and the connecting body two. Through linkage and cooperation of the movable piece and the opening and closing body, the opening of the flexible cloth cover can be synchronously opened in the movement process of the movable piece, so that the hard supporting frame is effectively wrapped by the flexible cloth cover. The safety hidden danger problem that the lifting or translating movable piece is exposed to the hard skeleton on the movement path in the baby furniture is solved. The synchronous closing mechanism has the advantages of simple structure, reliable linkage, high safety and the like.

Description

Technical Field

[0001] This invention belongs to the field of baby furniture technology, specifically a synchronous closing mechanism. Background Technology

[0002] With the upgrading of parenting concepts, the functional needs of infant and toddler furniture (such as cribs, interlocking beds, playpens, etc.) are increasing. To improve ease of use, modern infant and toddler furniture is generally designed with retractable, height-adjustable, or sliding movable parts, such as playpens that can slide up and down along the support frame. This type of design can flexibly adjust the furniture shape according to care needs and has significant practical value.

[0003] However, such movable structures also bring new safety issues. The surfaces of infant and toddler furniture, especially areas such as support frames and railings that come into frequent contact with infants and toddlers, are generally fully covered with flexible materials (such as fabric covers, silicone covers, etc.). This is mainly based on two considerations: first, flexible materials are soft and can effectively cushion accidental bumps and prevent injuries to infants and toddlers; second, they are skin-friendly and can prevent the skin from directly contacting the hard or cold frame, thus providing protection. This combination of "rigid frame + flexible full wrapping" has become a consensus in the industry for safety design.

[0004] However, the introduction of translation or lifting functions creates a technical contradiction in the combination of rigid frames and flexible materials. Specifically, when moving parts (such as the end fittings of the fence) move along fixed parts (such as the support frame), a rigid area that was originally covered but is now exposed after movement will inevitably appear along its path. If the fixed parts continue to wrap the flexible material in this area, the frequent sliding of the moving parts will quickly wear down the material, leading to damage and affecting aesthetics and lifespan. If the flexible material in this area is removed or partially hollowed out to avoid wear, the rigid frame will be exposed, creating a safety hazard and making it very easy for infants and young children to bump into it. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] Synchronous closing mechanism, including:

[0007] The opening and closing component has a connecting body one and a connecting body two that are arranged opposite to each other, and the opening and closing body is movably installed on the connecting body one and the connecting body two;

[0008] The movable component is partially arranged between connector one and connector two, and the movable component is connected to the opening and closing body.

[0009] The movable component moves along the direction of the connecting body, simultaneously driving the opening and closing body to open or close connecting body one and connecting body two.

[0010] In the aforementioned synchronous closing mechanism, the opening and closing body is provided in two sets, with the two sets of opening and closing bodies located on both sides of the movable part, and at least one set of the two sets of opening and closing bodies is connected to the movable part.

[0011] When only one set of opening / closing bodies and moving parts are connected, the moving parts move along the direction of the connecting bodies, simultaneously driving one of the opening / closing bodies to open or close connecting body one and connecting body two.

[0012] When both sets of opening and closing bodies are connected to the moving parts, the moving parts move along the direction of the connecting bodies, simultaneously driving one of the opening and closing bodies to open connecting body one and connecting body two, and the other opening and closing body to close connecting body one and connecting body two.

[0013] In the synchronous closing mechanism, the side of the movable component facing one of the opening and closing bodies is closed, and a connecting hole groove is provided on the closed side of the movable component. The side of the movable component facing the other opening and closing body is open.

[0014] In the synchronous closing mechanism, the movable component is closed on the side facing the opening and closing body, and a connecting hole groove is provided on the closed side of the movable component.

[0015] In the aforementioned synchronous closing mechanism, the side of the movable component facing the opening and closing body is always open.

[0016] In the aforementioned synchronous closing mechanism, a connecting member is installed on the moving part, and the connecting member is connected to the opening and closing body.

[0017] In the aforementioned synchronous closing mechanism, a connecting member is installed on the movable component via a pull-up member, and the connecting member is connected to the opening and closing body.

[0018] In the aforementioned synchronous closing mechanism, the connecting member has a through-hole, through which a pin is inserted and connected to the movable member.

[0019] In the aforementioned synchronous closing mechanism, the synchronous closing mechanism further includes a constraint body. The constraint body has a trapezoidal groove on the side facing the opening and closing body. The long side of the trapezoidal groove is the entrance side, and the short side is the constraint side. The short side of the trapezoidal groove has a groove opening. The constraint body forms elastic bodies on both sides of the groove opening.

[0020] In the aforementioned synchronous closing mechanism, the synchronous closing mechanism further includes a constraint body, and the side of the constraint body facing the opening and closing body has an inverted body.

[0021] In the aforementioned synchronous closing mechanism, an inverted body is provided at the end of the connector that is far from the closing body.

[0022] In the aforementioned synchronous closing mechanism, the end of the connector furthest from the closing body has a trapezoidal groove, with the long side of the trapezoidal groove being the entrance side and the short side being the constraint side. The short side of the trapezoidal groove has a groove opening, and the connector forms an elastic body on both sides of the groove opening.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. This application utilizes the linkage between the movable component and the opening / closing body. As the movable component moves along the support frame, it can simultaneously drive the opening / closing body to open or close connecting body one and connecting body two. This ensures that the opening of the flexible cover dynamically adjusts with the position of the movable component. The rigid support frame along the movement path of the movable component can be promptly wrapped by the flexible cover, fundamentally eliminating the safety hazards caused by the exposed support frame due to the movement of the movable component. This achieves full safety protection for infant and toddler furniture during lifting or sliding.

[0025] 2. This application sets two sets of opening and closing bodies and positions them on both sides of the movable part. When both sets of opening and closing bodies are connected to the movable part, the movement of the movable part can synchronously drive one of the opening and closing bodies to open the opening and the other opening and closing body to close the opening, forming a dynamic matching mechanism of "one opening and one closing". This ensures that the open area of ​​the fabric cover corresponds only to the current position of the movable part kit at any height, while the support frame above and below the kit is always tightly wrapped by the fabric cover, ensuring that the area of ​​the support frame wrapped reaches the theoretical maximum value. This is especially suitable for infant playpen products with large lifting stroke and high usage frequency, achieving the best wrapping effect and the highest level of safety protection.

[0026] 3. This application can flexibly adapt to different types of connection requirements by setting a closed surface and opening a connection hole groove on the kit of the moving parts, or setting an open opening, or a combination of both. This ensures the stability of the connection between the kit and the opening and closing body, while hiding most of the connection structure inside the kit, reducing the exposure of hard parts, effectively preventing infants and young children from touching or hooking hard connecting parts, and significantly improving the safety of product use.

[0027] 4. By setting connectors and pullers as intermediate connecting parts, this application can flexibly adjust the installation position and angle, making it easy to achieve reliable fixation in the narrow space inside the kit.

[0028] 5. This application, by setting a constraint body with a trapezoidal groove and an inverted body at the end of the connector, utilizes the principle of long-side introduction and short-side constraint of the trapezoidal groove, combined with the opening and resetting of the elastic body, to form a one-way anti-reverse structure. This structure can firmly constrain the inverted body within the constraint body, effectively preventing the connector from accidentally detaching from the kit or pull-out component. This ensures that the opening / closing body and the moving part maintain a reliable linkage relationship during long-term use, improving the product's durability and reliability. The positions of the trapezoidal groove and the inverted body can be flexibly interchanged, and the trapezoidal groove can be replaced with a hook structure. The connector and kit can also be detachably connected by means of pin insertion or plug-in components. These multiple connection methods allow the technical solution of this invention to adapt to different product positioning, cost requirements, and assembly processes, exhibiting good versatility and scalability. Attached Figure Description

[0029] Figure 1 This is a diagram showing the state of the opening / closing body and moving parts above this application before they are assembled.

[0030] Figure 2 This is a diagram showing the state of the opening / closing body and moving parts before they are assembled, as shown below in this application.

[0031] Figure 3 for Figure 9 A magnified view of a portion of point A in the middle.

[0032] Figure 4 This is a structural diagram showing the relationship between the connectors and constraints in this application.

[0033] Figure 5 This is a structural diagram of the connector in this application.

[0034] Figure 6 This is a structural diagram of the connector in this application.

[0035] Figure 7 This is the main view of the kit in this application.

[0036] Figure 8 This is a vertical cross-sectional view of the kit in this application at the upper connector.

[0037] Figure 9 This is a schematic diagram of the bed frame structure of this application.

[0038] In the diagram: 10. Opening / closing component; 11. Connector 1; 12. Connector 2; 13. Opening / closing component; 20. Moving component; 21. Connecting hole / slot; 22. Connecting component; 221. Inverted body; 23. Pull-up component; 231. Through hole; 24. Restraining body; 241. Trapezoidal groove. Detailed Implementation

[0039] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0040] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0041] like Figure 1 and Figure 9 As shown, the synchronous closing mechanism of this application is mainly applied to infant and toddler furniture, such as cribs, playpens, or modular beds with adjustable railings. The mechanism includes an opening / closing component 10 and a movable component 20. The movable component 20 consists of a railing rod and components fixed to its two ends. These components slide on connecting bodies 11 and 12, which serve as support frames, and can move up and down along their length (i.e., the direction of the connecting bodies), thereby achieving the lifting function of the railing. The components are equipped with a conventional locking mechanism (not shown in the figure) for positioning the movable component 20 at any height on the support frame to meet the height adjustment needs of different care scenarios; details are omitted here.

[0042] like Figure 1 and Figure 2 As shown, a flexible fabric cover is fitted over the support frame. This cover, made of textile fabric, silicone, or a composite soft material, serves to encase the rigid support frame and prevent infants from directly bumping into it. The cover has a longitudinal opening on the side facing the guardrail, providing a channel for the movable component 20 to slide along the support frame. The opening / closing component 10 controls the opening and closing of this longitudinal opening. It has two connectors, a first connector 11 and a second connector 12, which are respectively fixedly installed on the two sides of the opening of the cover, for example, by sewing, gluing, or heat pressing. An opening / closing component 13 is movably mounted on the first connector 11 and the second connector 12. The opening / closing component 13 can slide along the extension direction of the connectors, thereby engaging (i.e., closing the opening) or separating (i.e., opening the opening). In this embodiment, connector 11 and connector 2 12 are preferably two halves of a zipper chain (i.e., the chain teeth on the left and right sides), and the opening and closing body 13 is the zipper head. By sliding the zipper head along the chain direction, the chain teeth on both sides are engaged or separated in sequence by the internal guiding mechanism, so as to achieve smooth opening and closing of the opening. Of course, other forms of adaptable structures that can be spliced ​​together to complete the opening and closing can also be used.

[0043] like Figure 1 and Figure 2 As shown, the kit of the movable part 20 is movably arranged between the first connector 11 and the second connector 12. When the kit of the movable part 20 moves up and down along the support frame, it can simultaneously drive the opening and closing body 13 to move, so that the opening of the cloth cover is always controlled in the vicinity of the kit location, thereby avoiding the support frame being exposed for a long time on the kit's movement path and completely eliminating the safety hazards caused by the opening of the flexible cloth cover.

[0044] The opening / closing body 13 and the moving part 20 are linked together in various ways. Regarding the arrangement of the opening / closing body 13, the present invention provides various combinations to adapt to different lifting strokes and usage habits.

[0045] As one basic implementation, the opening / closing body 13 can be provided in only one set. This set of opening / closing bodies 13 can be located above the movable component 20. Its working principle is as follows: when the component moves from a high position to a low position, the component moves the opening / closing body 13 downwards, causing the opening to close immediately above the component, thus quickly covering the support frame area exposed by the component's downward movement; conversely, when the component moves upwards, the opening / closing body 13 moves upwards accordingly, and the opening below it opens, but since the component itself occupies this area, the support frame remains unexposed. Alternatively, the set of opening / closing bodies 13 can be located below the component, with the opposite working logic: when the component moves upwards, it moves the opening / closing body 13 upwards, immediately closing the support frame area exposed below the component due to its upward movement. This single-set opening / closing body solution has a simple structure, low cost, and is suitable for infant furniture products with a small lifting stroke.

[0046] In another preferred embodiment, two sets of opening / closing bodies 13 are provided, located above and below the movable component 20 respectively. At least one set of opening / closing bodies 13 is fixedly connected to the movable component 20. When only the upper or lower opening / closing body 13 is directly connected to the component, the other unconnected set of opening / closing bodies 13 can be manually adjusted in position. For example, after the component descends to its lowest point, the caregiver can manually pull down the upper opening / closing body 13 to a position close to the upper surface of the component to seal the opening section at the top of the component; similarly, after the component ascends to its highest point, the lower opening / closing body 13 can be manually pushed up to a position close to the lower surface of the component. This solution retains the flexibility of manual fine-tuning while ensuring automatic linkage.

[0047] More preferably, such as Figure 3As shown, both sets of opening and closing bodies 13 form a fixed or synchronous linkage relationship with the kit of the movable part 20. In this state, when the kit moves along the support frame, one of the opening and closing bodies 13 can be driven to open the connecting body 11 and the connecting body 22 simultaneously, while the other opening and closing body 13 can be driven to close the connecting body 11 and the connecting body 22. Specifically, taking the upward movement of the kit as an example: during the upward movement of the kit, the opening and closing body 13 below it moves upward synchronously, gradually closing the opening of that section; at the same time, the opening and closing body 13 above it moves upward synchronously, gradually opening the opening of that section. Conversely, when the kit moves downward, the upper opening and closing body 13 closes the opening, and the lower opening and closing body 13 opens the opening. Through this dynamic matching of "one opening and one closing", it is ensured that during the entire lifting process, the open area of ​​the fabric cover opening always corresponds only to the current position of the kit, while the support frame above and below the kit is tightly wrapped by the fabric cover, so that the area of ​​the support frame wrapped reaches the theoretical maximum at any height, achieving the best safety protection effect of no exposure throughout the entire process, which is especially suitable for infant playpen products with large lifting strokes and high usage frequency.

[0048] To achieve a stable connection between the kit of the moving part 20 and the opening / closing body 13, the present invention provides a variety of kit end structure forms to adapt to different types of connection and installation requirements.

[0049] One form is, such as Figure 3 As shown, the assembly of the movable part 20 has a closed surface on the side facing one of the opening / closing bodies 13, and a connecting slot 21 is provided on this closed surface; the side facing the other opening / closing body 13 is an open opening. This "one closed and one open" structure is the most common arrangement, which ensures the stability of the connection on one side, and provides sufficient assembly operation space by utilizing the open opening.

[0050] In another form, the sides of the kit facing the two opening / closing bodies 13 are all closed surfaces, and each closed surface has a connection hole groove 21. This fully enclosed structure has the best effect in hiding rigid components, the appearance is cleaner and more beautiful, and it can provide better protection for internal connectors, preventing infants' fingers from sticking in.

[0051] Another form is where the sides of the kit facing the two opening / closing bodies 13 are open. This structure is the simplest, allowing the opening / closing bodies 13 or connecting parts 22 to directly penetrate into the kit for connection, minimizing assembly steps and making it suitable for cost-sensitive product solutions. All three structures described above are within the scope of this invention and can be flexibly selected according to actual product positioning and assembly process requirements.

[0052] Taking a conventional rising fence as an example, considering the structural characteristics of fence kits, which typically have an exposed top and are connected to the fence crossbars at the bottom, such as... Figures 3 to 8As shown, the top of the kit is preferably a closed surface and has a connecting hole groove 21 for connecting the upper opening / closing body 13 or connector 22 to close the connection point and reduce external hard points; the bottom of the kit is preferably an open opening for accommodating or connecting the lower opening / closing body 13 or connector 22, thereby simplifying the bottom connection structure and reducing assembly difficulty.

[0053] Regarding the connection method between the kit of the movable part 20 and the opening / closing body 13, the present invention provides a variety of connection structure forms to achieve reliable force transmission.

[0054] The movable component 20 is equipped with a connector 22 for connecting to the opening / closing body 13. The connector 22 can be a structure with traction function, such as a ring, an open ring, a hook, or a flexible cable (such as a steel wire rope or a high-strength nylon rope).

[0055] In addition, a pull tab 23 can be added to the kit, through which the connector 22 is installed on the kit. The pull tab 23 serves as an intermediate transition component, allowing for flexible adjustment of the installation position and angle of the connector 22, while also facilitating reliable fixation within the confined space inside the kit. Specifically, when the top of the kit is closed and has a connecting slot 21, the upper opening / closing body 13 can be directly hooked to the connecting slot 21 via the connector 22. One end of the connector 22 hooks onto the pull tab or dedicated hanging hole of the opening / closing body 13, and the other end passes through the connecting slot 21 and is fixed inside the kit. When the bottom of the kit is open, the pull tab 23 is fixedly installed inside the kit, for example, by adhesive, snap-fit, or screws to a pre-reserved mounting position on the inner wall of the kit. Alternatively, the pull tab 23 can have a through hole 231, through which a pin can be inserted to fix the pull tab 23 to the inner wall of the kit. The lower opening / closing body 13 is connected to the pull member 23 via its own hanging hole or an additional connecting piece 22. This design hides most of the connecting structure inside the kit, reducing the exposure of hard parts, which not only improves aesthetics but, more importantly, prevents infants and young children from touching or getting their fingers caught on the hard connecting parts, significantly improving safety.

[0056] The present invention further provides a constraint structure to prevent the connector 22 from accidentally dislodging from the kit connection slot 21 or the pull member 23, so as to ensure the long-term reliability of the linkage.

[0057] Regarding the connection method at the top of the kit, such as Figure 7As shown, the kit contains a constraint body 24. On the side of the constraint body 24 facing the opening / closing body 13, there is a trapezoidal groove 241. The trapezoidal groove 241 communicates with the connecting hole groove 21, together forming a channel for the connector 22 to pass through. The trapezoidal groove 241 is wider at the top and narrower at the bottom. Its long side (wide end) is located on the entrance side, facilitating the insertion of the inverted body 221 at the end of the connector 22. Its short side (narrow end) is located on the constraint side, and a groove is provided at the short side, allowing the constraint body 24 to form an elastic body (also called a claw) on both sides of the groove. Correspondingly, the end of the connector 22 connected to the opening / closing body 13 on this side has an inverted body 221. The maximum outer diameter of the inverted body 221 is larger than the groove width of the short side of the trapezoidal groove 241, but smaller than the entrance width of the long side. During installation, the inverted body 221 is passed through the wide end of the connecting hole slot 21 and the trapezoidal slot 241 from top to bottom. As the inverted body 221 descends to the narrow end, its conical or arc-shaped surface gradually opens the elastic claws on both sides, causing the claws to deform elastically. When the inverted body 221 has completely passed through the narrow end, the elastic claws return to their original shape, and their ends are locked above the inverted body 221, forming a one-way anti-reverse structure. This securely restrains the inverted body 221 between the restraint body 24 and the inner wall of the kit, ensuring that the opening and closing body 13 and the kit can move synchronously under tension in any direction and will not detach.

[0058] like Figure 4 , Figure 6 , Figure 8 As shown, the connection method at the bottom of the kit is symmetrical to that at the top. The zipper pull 23 also has a constraint body 24. The long side (wide end) of the trapezoidal groove 241 of this constraint body 24 is located on the bottom entrance side, and the short side (narrow end) is located on the top constraint side. The inverted body 221 of the lower connector 22 is inserted from bottom to top and is constrained by the elastic claws through the same "open-reset-lock" process. The aforementioned inverted body 221 can also be directly formed on the body of the opening / closing body 13, for example, by designing the end of the zipper pull tab as a hook, thereby eliminating the need for a separate connector 22 and further simplifying the number of parts. This also falls within the scope of protection of this invention.

[0059] As an equivalent alternative to the aforementioned anti-detachment structure, the positions of the trapezoidal groove 241 and the inverted body 221 can be interchanged. That is, the trapezoidal groove 241 is located on the connector 22, forming a female connector structure, while the inverted body 221 is located on the constraint body 24, forming a male connector structure. The two are detachably fixedly connected via an elastic interlocking mechanism. Alternatively, the trapezoidal groove 241 on the constraint body 24 can be replaced with a simple hook structure, whereby the constraint body 24 extends downwards or upwards with a hook, directly engaging with the connector 22 (e.g., a ring), achieving the same reliable connection and limiting function. This hook structure is simpler, but its vibration resistance is slightly inferior to the trapezoidal groove interlocking structure, making it suitable for scenarios where connection stability requirements are not high.

[0060] In addition to the elastic engagement method described above, which uses a trapezoidal groove to engage with the inverted body, the connection between the connector 22 and the kit (or the pull member 23) can also be achieved through a more direct mechanical fastening method. For example, a through hole can be provided at the end of the connector 22, and a corresponding pin hole can be provided on the kit or the pull member 23. A pin can be directly inserted between the two to achieve a hinged or fixed connection. Alternatively, a detachable connection can be achieved through additional plug-in components, such as quick-release buckles made of plastic, with male and female buckles respectively provided on the connector 22 and the pull member 23, allowing for quick assembly and disassembly by pressing. All physical connection methods that enable the kit of the opening / closing body 13 and the moving part 20 to maintain synchronous movement during the lifting process, regardless of their specific structural form, should be considered as technical solutions covered by this invention and should not be limited to the individual examples listed in the above specific embodiments.

[0061] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. The substitutions may be replacements of some structures, devices, or method steps, or they may be complete technical solutions. Equivalent substitutions or modifications made to the technical solutions and inventive concepts of the present invention should all be covered within the scope of protection of the present invention.

Claims

1. A synchronous closing mechanism, characterized in that, include: The opening and closing part (10) has a connecting body one (11) and a connecting body two (12) arranged opposite to each other, and an opening and closing body (13) is movably installed on the connecting body one (11) and the connecting body two (12). The movable part (20) is partially arranged between the first connector (11) and the second connector (12), and the movable part (20) is connected to the opening and closing body (13); The movable part (20) moves along the direction of the connecting body arrangement, and simultaneously drives the opening and closing body (13) to open or close the connecting body one (11) and the connecting body two (12).

2. The synchronous closing mechanism according to claim 1, characterized in that, The opening and closing body (13) is provided in two sets, and the two sets of opening and closing bodies (13) are located on both sides of the movable part (20). At least one set of the two sets of opening and closing bodies (13) is connected to the movable part (20).

3. The synchronous closing mechanism according to claim 2, characterized in that, When only one set of opening / closing bodies (13) and moving parts (20) are connected, the moving parts (20) move along the direction of the connecting body arrangement, and simultaneously drive one of the opening / closing bodies (13) to open or close connecting body one (11) and connecting body two (12).

4. The synchronous closing mechanism according to claim 2, characterized in that, When both sets of opening and closing bodies (13) are connected to the movable part (20), the movable part (20) moves along the direction of the connecting body arrangement, and simultaneously drives one of the opening and closing bodies (13) to open the first connecting body (11) and the second connecting body (12), and the other opening and closing body (13) to close the first connecting body (11) and the second connecting body (12).

5. The synchronous closing mechanism according to claim 1, characterized in that, The movable part (20) is closed on one side facing one of the opening and closing bodies (13), and a connecting hole groove (21) is provided on the closed side of the movable part (20). The movable part (20) is open on the other side facing the other opening and closing body (13).

6. The synchronous closing mechanism according to claim 1, characterized in that, The movable part (20) is closed on the side facing the opening and closing body (13), and a connecting hole groove (21) is provided on the closed side of the movable part (20).

7. The synchronous closing mechanism according to claim 1, characterized in that, The movable part (20) is open on the side facing the opening and closing body (13).

8. The synchronous closing mechanism according to claim 1, characterized in that, The movable part (20) is equipped with a connector (22), which is connected to the opening and closing body (13).

9. The synchronous closing mechanism according to claim 8, characterized in that, The movable part (20) is fitted with a connector (22) via a pull-up connector (23).

10. The synchronous closing mechanism according to claim 9, characterized in that, The pull member (23) has a through hole (231), in which a pin is inserted and connected to the movable member (20).

11. The synchronous closing mechanism according to claim 1, characterized in that, The synchronous closing mechanism also includes a constraint body (24), which has a trapezoidal groove (241) on the side facing the opening and closing body (13). The long side of the trapezoidal groove (241) is the entrance side and the short side is the constraint side. The short side of the trapezoidal groove (241) has a groove opening. The constraint body (24) forms elastic grippers on both sides of the groove opening.

12. The synchronous closing mechanism according to claim 1, characterized in that, The synchronous closing mechanism also includes a constraint body (24), which has an inverted body (221) on the side facing the opening and closing body (13).

13. The synchronous closing mechanism according to claim 8, characterized in that, The connector (22) is provided with an inverted body (221) at the end away from the closed body (13).

14. The synchronous closing mechanism according to claim 8, characterized in that, The connector (22) has a trapezoidal groove (241) at one end away from the closed body (13). The long side of the trapezoidal groove (241) is the entrance side and the short side is the constraint side. The short side of the trapezoidal groove (241) has a groove opening. The connector (22) forms elastic grippers on both sides of the groove opening.

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