A folding sliding door system

Abstract

A kind of folding sliding door system, it is applied to cabinet with opening, the opening top of the cabinet is equipped with upper rail, the system includes: first door body, one side is swingably connected with the cabinet by fixed hinge;Second door body, one side is swingably connected with the other side of the first door body by hinge, and: guide pulley block, it is installed on the other side top of the second door body, and is slidably connected with the upper rail.The utility model has the beneficial effects that: the utility model combines the advantages of two kinds of opening and closing ways of sliding door and sliding door.By the linkage mode of " first folding, then sliding", the opening of the whole cabinet is completely exposed, realizes the " full open " effect of cabinet door.This core advantage completely solves the problem of limited opening degree of traditional sliding door, users no longer need to be limited to half or less opening width, can easily, barrier-free access to any position of the article in the cabinet, including large articles.

Description

Technical Field

[0001] This utility model relates to the field of furniture hardware technology, specifically a folding sliding door system. Background Technology

[0002] In daily life, the design of cabinet doors, especially wardrobes, storage cabinets, and display cabinets, is crucial to the practicality, space utilization, and user experience of the furniture. Currently, the mainstream cabinet door systems on the market mainly include two types: sliding doors (also known as sliding doors or push-pull doors) and hinged doors (also known as hinged doors or swing doors). However, both of these forms have their own inherent limitations and cannot perfectly meet the increasingly diverse needs of modern homes.

[0003] Firstly, regarding sliding door systems, their main characteristic is that multiple door panels slide on horizontal tracks, opening and closing the cabinet doors by overlapping the panels. This design avoids the problem of cabinet doors opening outwards and occupying front space, offering a certain space advantage in space-constrained environments, such as narrow corridors or compact bedrooms. However, sliding doors have a significant drawback: regardless of the number of doors, usually only half or less of the cabinet width can be opened, severely limiting the retrieval of items inside. For example, a two-door wardrobe can only open one door at a time, making it extremely inconvenient to access items in the middle area; for some large items, it may even be difficult to retrieve them smoothly. This limitation of "opening only halfway" greatly reduces the effective utilization of the cabinet space and the user's convenience. Users often need to turn sideways or even bend over to reach the obstructed area, resulting in very limited operating space, which in turn affects the classification, organization, and convenient access of items.

[0004] Secondly, traditional hinged door systems are characterized by hinged doors mounted on the side of the cabinet and opening by swinging outwards. Hinged doors typically allow the cabinet to open fully, providing an unobstructed view of the interior and theoretically facilitating access to items. However, hinged doors also have significant drawbacks: when fully open, they swing outwards dramatically, occupying considerable space in front of the cabinet. This means that when using hinged door cabinets, a passageway or operating area larger than the width of the door must be reserved in front of the cabinet. In the context of increasingly limited modern living space, this requirement for usable space undoubtedly brings many inconveniences to home layout and daily activities. For example, in a bedroom, if the bed and wardrobe are close together, the hinged door may not be able to open fully, and may even collide with the bed or other furniture, causing damage to the door or furniture; in narrow hallways or small rooms, opening the hinged door often obstructs passage and affects the overall flow of the space. In addition, large hinged doors will experience significant dynamic loads and fatigue stress on their hinges during frequent opening and closing. Over time, this can lead to problems such as door sagging, loosening or damage to the hinges, affecting the aesthetics and lifespan of the cabinet doors.

[0005] In addition to the main drawbacks mentioned above, some existing cabinet door systems also have shortcomings in terms of operational stability, ease of installation, and flexibility of post-installation adjustments. For example, some multi-door linkage or sliding systems may experience jamming, shaking, or abnormal noises during operation, seriously affecting the user experience. Furthermore, to ensure the long-term smooth operation and good appearance of the cabinet door system, precise adjustments to the vertical height and horizontal position of the doors are often required during installation. However, the adjustment mechanisms provided by existing technologies may be complex in structure, cumbersome in operation, have low adjustment accuracy, or have a limited adjustment range, resulting in low installation efficiency and being time-consuming and labor-intensive. Moreover, once the doors sag or tilt due to gravity, wear and tear, or environmental changes, subsequent maintenance and adjustments are very inconvenient and may even fail to achieve the desired calibration effect. Therefore, further improvements are necessary. Utility Model Content

[0006] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a folding sliding door system that is more compact in structure, more aesthetically pleasing in appearance, and can balance space utilization efficiency, ease of opening and closing, smooth operation, and flexible installation and adjustment.

[0007] The purpose of this utility model is achieved through the following means: a folding sliding door system applied to a cabinet with an opening, wherein an upper guide rail is installed at the top of the opening of the cabinet, and the system includes: The first door is swayably connected to the cabinet via a fixed hinge on one side. The second door, one side of which is swayably connected to the other side of the first door via a hinge, and: A guide pulley assembly is installed on the top of the other side of the second door body and is slidably connected to the upper guide rail.

[0008] Further: the guide pulley assembly includes: A movable hinge connects to the second door body; The base is connected to the movable hinge; A lifting frame, wherein a guide groove is provided on the base, and the lifting frame is vertically and slidably installed in the guide groove; The upper guide wheel is installed on the top of the lifting frame and extends into the upper guide rail.

[0009] Furthermore, the lifting frame is vertically provided with an adjustment groove, and the height adjustment bolt passes through the adjustment groove and is connected to the base to adjust and lock the relative height between the lifting frame and the base.

[0010] Furthermore: the lifting frame is provided with a height adjustment nut seat, the anti-detachment adjustment bolt is connected in the height adjustment nut seat, the top of the anti-detachment adjustment bolt is equipped with an anti-detachment guide wheel, and the anti-detachment guide wheel is slidably engaged with the inner back of the upper guide rail.

[0011] Furthermore, the base is provided with a connecting groove, and the movable hinge is installed in the connecting groove.

[0012] Furthermore, the base is provided with a connecting bolt, which passes through the base and connects to the movable hinge in the connecting groove.

[0013] Furthermore: a first decorative cover is installed on one side of the base, and a second decorative cover is installed on the other side of the base. The first decorative cover and the second decorative cover cooperate with each other to cover the guide pulley assembly.

[0014] Furthermore, several fixed hinges are provided and installed vertically at intervals on the cabinet and the first door.

[0015] Furthermore, several hinges are provided and are installed on the first door body and the second door body in a vertically spaced manner.

[0016] Furthermore, a positioning seat is also installed inside the upper guide rail. The positioning seat has a positioning groove on the side facing the guide pulley group. When the door is in the closed state, the upper guide wheel is engaged into the positioning groove.

[0017] The beneficial effects of this utility model are: 1. Simple structure, low production cost, and improved market competitiveness.

[0018] 2. This utility model combines the advantages of both hinged doors and sliding doors. Through a "fold first, slide later" linkage, the entire cabinet opening is fully exposed, achieving a "fully open" effect. This core advantage completely solves the problem of limited opening of traditional sliding doors. Users are no longer limited by half or less of the opening width and can easily and unobstructedly access items, including large items, in any location within the cabinet. This greatly improves the utilization efficiency of the cabinet space, allowing users to plan and use the storage space more flexibly, significantly enhancing the convenience and comfort of daily use.

[0019] 3. In this utility model, the door panel only occupies limited external space during the folding stage. Once folded and slid to the side, it no longer obstructs the usable space in front of the cabinet. This design is particularly important in the context of increasingly limited modern home space, allowing other furniture to be placed in front of the cabinet or maintaining a passageway without worrying about restricted or obstructed door opening. This greatly improves the flexibility of home layout and space utilization efficiency, and is especially suitable for small apartments, bedrooms, corridors, and other scenarios with high space requirements.

[0020] 4. In this system, the anti-detachment adjusting bolt is threaded into the height adjusting nut seat on the lifting frame, and its top anti-detachment guide wheel can slide against the inner back of the upper guide rail. This structure effectively prevents the door from derailing or wobbling unnecessarily during sliding, maintaining stable operation even on uneven ground or under external impact. Simultaneously, the anti-detachment mechanism improves safety, avoiding the risk of the door accidentally falling. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the door in the closed state in this utility model.

[0022] Figure 2 This is a schematic diagram of the door in the open state in this utility model.

[0023] Figure 3 This is a schematic diagram of the door being closed and the cabinet being hidden in this utility model.

[0024] Figure 4 This is a schematic diagram of the door in the present invention in the state of being open and the cabinet body hidden.

[0025] Figure 5 In this utility model Figure 4 Enlarged view of the structure of part A.

[0026] Figure 6 This utility model is a guide pulley assembly and an upper guide rail assembly.

[0027] Figure 7This is an assembly drawing of the decorative cover in this utility model.

[0028] Figure 8 , 9 This is a schematic diagram of the guide pulley block structure in this utility model.

[0029] Explanation of reference numerals in the attached drawings: 1. Cabinet body; 10. Lifting frame; 11. Upper guide wheel; 12. Adjustment groove; 13. Height adjustment bolt; 14. Height adjustment nut seat; 15. Anti-detachment adjustment bolt; 16. Anti-detachment guide wheel; 17. Connecting groove; 18. Connecting bolt; 19. First decorative cover; 2. Upper guide rail; 20. Second decorative cover; 21. Positioning seat; 22. Positioning groove; 3. First door body; 4. Second door body; 5. Fixed hinge; 6. Hinge; 7. Movable hinge; 8. Base; 9. Guide groove. Detailed Implementation

[0030] The present invention will be further described in detail below with reference to the accompanying drawings. A folding sliding door system is applied to a cabinet with an opening, wherein an upper guide rail 2 is installed at the top of the opening of the cabinet 1, and the system includes: The first door 3 is swayably connected to the cabinet 1 via a fixed hinge 5 on one side; The second door 4, one side of which is swayably connected to the other side of the first door 3 via a hinge 6; and; The guide pulley assembly is installed on the top of the other side of the second door body 4 and is slidably connected to the upper guide rail 2.

[0031] In this embodiment: when the cabinet door system is closed, the first door 3 and the second door 4 unfold and together cover the opening of the cabinet 1. When it is necessary to open the cabinet door, the user first pushes the second door 4. Since the second door 4 is connected to the first door 3 by a hinge 6, and the first door 3 is connected to the cabinet 1 by a fixed hinge 5, the second door 4 will initially swing and fold outward relative to the first door 3, while simultaneously causing the first door 3 to swing relative to the cabinet 1. This allows the first door 3 and the second door 4 to fold and overlap each other, ultimately fully exposing the opening of the entire cabinet 1.

[0032] Compared to traditional technologies, this embodiment cleverly combines the swing-opening function of a hinged door with the sliding function of a sliding door, achieving a "fully open" effect for the cabinet door system. Unlike traditional sliding doors that can only open half of the cabinet, this system fully exposes the interior space, greatly improving the convenience of accessing items and the efficiency of cabinet space utilization. Furthermore, compared to traditional hinged doors, its folding and sliding design significantly reduces the space occupied by the cabinet door when open, enhancing the flexibility of home layout.

[0033] In one embodiment: the guide pulley assembly includes: The movable hinge 7 is connected to the second door body 4; The base 8, on which the movable hinge 7 is mounted; The lifting frame 10 has a guide groove 9 on its base 8, and the lifting frame 10 is vertically and slidably installed in the guide groove 9. The upper guide wheel 11 is installed on the top of the lifting frame 10 and extends into the upper guide rail 2.

[0034] In this embodiment: the movable hinge 7 serves as the hub connecting the second door 4 to the entire pulley assembly, allowing the second door to rotate at a certain angle during folding, ensuring smooth folding. The base 8, as the main body of the pulley assembly, supports the lifting frame 10 and the upper guide wheel 11. The lifting frame 10 slides vertically within the base 8 via the guide groove 9, providing a basis for adjusting the vertical height of the door. The upper guide wheel 11 is installed on top of the lifting frame 10 and extends into the groove of the upper guide rail 2. When the door slides, rolling friction occurs between the upper guide wheel 11 and the upper guide rail 2, allowing the door assembly to slide smoothly and effortlessly on the upper guide rail.

[0035] The movable hinge 7 allows the folded door assembly to connect with the pulley assembly at a flexible angle, ensuring a smooth transition between folding and sliding operations. Meanwhile, the cooperation between the lifting frame 10 and the guide groove 9 provides a structural basis for adjusting the door height, solving the problem of door sagging due to installation errors or long-term use, and improving the system's adaptability and ease of maintenance.

[0036] In one embodiment: the lifting frame 10 is provided with an adjustment groove 12 vertically, and the height adjustment bolt 13 passes through the adjustment groove 12 and is connected to the base 8, for adjusting and locking the relative height between the lifting frame 10 and the base 8.

[0037] When the height of the upper guide wheel needs to be adjusted, the user can do so by loosening or tightening the height adjustment bolt 13. When the bolt is loosened, the lifting frame 10 can move vertically relative to the base 8 within the adjustment groove 12, thereby changing the vertical distance between the upper guide wheel 11 and the second door 4, and thus adjusting the height of the upper guide wheel. After the height of the upper guide wheel is adjusted to the desired position, tightening the height adjustment bolt 13 will apply pressure to the lifting frame 10 and the base 8, locking them at the new relative height.

[0038] In one embodiment: the lifting frame 10 is provided with a height adjustment nut seat 14, the anti-detachment adjustment bolt 15 is threadedly connected to the height adjustment nut seat 14, the top of the anti-detachment adjustment bolt 15 is equipped with an anti-detachment guide wheel 16, and the anti-detachment guide wheel 16 is slidably engaged with the inner back of the upper guide rail 2.

[0039] In this embodiment, the anti-detachment adjusting bolt 15 is connected to the height adjusting nut seat 14 on the lifting frame 10 via threads, allowing for height adjustment. When the door slides on the upper guide rail 2, the anti-detachment guide wheel 16 installed on top of the anti-detachment adjusting bolt 15 makes close contact with and slides against the inner back of the upper guide rail 2. The presence of the anti-detachment guide wheel 16 effectively limits the possibility of the door lifting upwards or tilting outwards. Even if the door is impacted, it can be firmly "locked" in the upper guide rail 2, preventing it from derailing.

[0040] The anti-detachment guide wheel 16 slides with the inner back of the upper guide rail 2 to form an effective "clamping" mechanism, preventing the door from lifting up and detaching from the upper guide rail for various reasons, and ensuring that the door always runs within the predetermined track.

[0041] At the same time, the close cooperation reduces the lateral and vertical swaying of the door during the sliding process, improving the smoothness of opening and closing and the user experience.

[0042] In one embodiment: the base 8 is provided with a connecting groove 17, and the movable hinge 7 is installed in the connecting groove 17.

[0043] The connecting groove 17 provides a predetermined installation position and space for the movable hinge 7, ensuring that it can be securely embedded or fixed inside the base 8. This internal installation method effectively protects the movable hinge 7 from the base 8, reduces its exposed parts, and also makes the entire guide pulley assembly more compact and integrated.

[0044] In one embodiment: a connecting bolt 18 is provided on the base 8, and the connecting bolt 18 passes through the base 8 and is connected to the movable hinge 7 in the connecting groove 17.

[0045] In this embodiment, the connecting bolt 18 passes through the outside of the base 8 and is fixedly connected to the movable hinge 7 installed in the connecting groove 17. By tightening the connecting bolt 18, the movable hinge 7 is reliably fixed in the connecting groove 17 of the base 8, ensuring that the movable hinge 7 can stably withstand the force and movement from the second door 4 during the folding and sliding of the door and transmit it to the base 8. The bolted connection ensures the connection strength and stability between the movable hinge 7 and the base 8, preventing loosening during long-term use. At the same time, the bolted connection allows for convenient disassembly and replacement of the movable hinge 7 or maintenance when needed, improving the maintainability of the system.

[0046] In one embodiment: a first decorative cover 19 is installed on one side of the base 8, and a second decorative cover 20 is installed on the other side of the base 8. The first decorative cover 19 and the second decorative cover 20 cooperate with each other to cover the guide pulley assembly.

[0047] After the guide pulley assembly is installed on the top of the door, the first decorative cover 19 and the second decorative cover 20 are installed from both sides of the base 8 and interlock or snap together. The two decorative covers together form a closed or semi-closed cavity, which completely encloses the base 8, the lifting frame 10, the upper guide wheel 11, and related adjustment and connecting components, such as movable hinges and bolts.

[0048] In this embodiment, the complex mechanical structure inside the guide pulley assembly is hidden, making the top of the entire door look simpler and flatter, integrating with the cabinet and door panel design, and enhancing the overall visual effect and grade of the product.

[0049] Meanwhile, the encasing structure effectively prevents dust and dirt from entering the pulley system, protecting the precision mechanical components, reducing maintenance frequency, and extending service life. Additionally, the decorative cover surface is typically smooth and easy to clean, facilitating daily maintenance.

[0050] In one embodiment: a plurality of fixed hinges 5 are provided and are installed on the cabinet 1 and the first door 3 in a vertically spaced manner.

[0051] In this embodiment, multiple fixed hinges 5 are vertically spaced and installed on the corresponding sides of the cabinet 1 and the first door 3. During the opening and closing of the door, these hinges jointly bear the weight of the first door 3 and the stress generated by its swinging motion with the cabinet 1. The multi-point support design ensures that the load on the hinges is evenly distributed, reducing the pressure on individual hinges.

[0052] In addition, the multi-point connection makes the connection between the first door 3 and the cabinet 1 more secure, and makes the swing opening and closing process more stable, reducing shaking.

[0053] In one embodiment: a plurality of hinges 6 are provided and are vertically spaced and installed on the first door body 3 and the second door body 4.

[0054] Similar to fixed hinges, multiple hinges 6 are vertically spaced and installed at the connecting edge of the first door body 3 and the second door body 4. When the doors are folded, these hinges share the connection and folding stress between the two doors, ensuring that the two doors can swing and fold relative to each other synchronously and smoothly.

[0055] In one embodiment: a positioning seat 21 is also installed in the upper guide rail, and a positioning groove 22 is started on the side of the positioning seat facing the guide pulley group. When the door is in the closed state, the upper guide wheel 11 is engaged in the positioning groove.

[0056] Therefore, when the cabinet door is closed, the upper guide wheel 11 engages with the positioning groove 22. The positioning groove serves to limit and suspend the upper guide wheel, preventing the cabinet door from sinking when it is closed for extended periods.

[0057] In summary, this utility model provides a folding sliding door system, whose core working principle lies in the ingenious integration of the folding and swinging characteristics of traditional hinged doors and the linear movement characteristics of sliding doors, aiming to achieve a "fully open" effect for cabinet openings and improve the overall user experience.

[0058] Specifically: When the user needs to open the cabinet door, the operation begins with the second door 4. The user pushes the second door 4 outwards. At this time, since the first door 3 is connected to the cabinet 1 via a fixed hinge 5, and the second door 4 is connected to the first door 3 via a hinge 6, the second door 4 will first swing and fold relative to the first door 3 around the axis of the hinge 6. Simultaneously, as the second door 4 folds, the first door 3 will also swing inwards or outwards relative to the cabinet 1 around the axis of the fixed hinge 5. These two swinging actions occur in tandem, causing the first door 3 and the second door 4 to move closer to each other and fold, ultimately forming a compact, stacked door panel assembly, the width of which is approximately equal to the width of a single door panel. During this process, the upper guide wheel 11 at the top of the guide pulley assembly can move within the upper guide rail 2, but its main function is to realize the folding action of the second door. Finally, the entire opening of the cabinet 1 is fully exposed, achieving a 100% "fully open" effect.

[0059] Meanwhile, the cabinet door closing process is the reverse of the opening process. The user pulls the slid-out door panel assembly from one side of the cabinet. The door panel assembly slides along the upper guide rail 2 via the guide pulley assembly. Subsequently, the user further pushes or pulls the door panel assembly, causing the first door 3 and the second door 4 to swing outwards around the axis of the hinge 6 and the fixed hinge 5, until the two doors are fully opened and tightly closed, thereby closing the cabinet opening.

[0060] To ensure smooth operation and perfect alignment of the door with the cabinet under all conditions, this system incorporates a height adjustment mechanism. Through the coordination of the adjustment slot 12 and the height adjustment bolt 13, the user can precisely adjust the vertical position of the lifting frame 10 within the base 8. When the height adjustment bolt 13 is loosened, the lifting frame 10 can move up and down, thereby changing the ground clearance of the upper guide wheel 11, ensuring that the upper guide wheel always slides within the upper guide rail. Once the ideal height is reached, tightening the height adjustment bolt 13 locks the lifting frame 10, ensuring the stability of the upper guide wheel's height.

[0061] To further enhance operational stability and safety, this system incorporates an anti-detachment mechanism. The anti-detachment adjusting bolt 15 is installed within the height-adjusting nut seat 14 of the lifting frame 10, with its top anti-detachment guide wheel 16 slidingly engaging with the inner back of the upper guide rail 2. The anti-detachment guide wheel 16 provides downward support or upward restraining force, effectively preventing the door from jumping off the upper guide rail 2 during sliding or derailing due to shaking. By adjusting the anti-detachment adjusting bolt 15, the gap between the anti-detachment guide wheel 16 and the inner back of the upper guide rail 2 can be adjusted to optimize the anti-detachment effect and sliding resistance.

[0062] It should be noted that the complex internal structure of the guide pulley assembly is completely enclosed by the cooperation of the first decorative cover 19 and the second decorative cover 20. This not only hides the mechanical parts and enhances the overall aesthetics and neatness of the system, but also provides dust and corrosion protection, extending the service life of the internal components.

[0063] In summary, this folding sliding door system, through its ingenious linkage "folding + sliding" opening and closing mechanism, coupled with efficient guide wheel height adjustment, reliable anti-derailment and stability design, and a practical and aesthetically pleasing appearance, effectively solves the pain points of existing cabinet door systems and provides a new type of cabinet door solution that is functionally superior, easy to operate, safe, reliable, and aesthetically pleasing.

[0064] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A folding sliding door system applied to a cabinet with an opening, wherein an upper guide rail (2) is installed at the top of the opening of the cabinet (1), characterized in that: The system includes: The first door (3) is swayably connected to the cabinet (1) on one side by a fixed hinge (5); The second door (4) is swayably connected on one side to the other side of the first door (3) via a hinge (6); and The guide pulley assembly is installed on the top of the other side of the second door body (4) and is slidably connected to the upper guide rail (2).

2. The folding sliding door system according to claim 1, characterized in that: The guide pulley assembly includes: The movable hinge (7) is connected to the second door body (4); The base (8) is connected to the movable hinge (7); A lifting frame (10), the base (8) having a guide groove (9), the lifting frame (10) being vertically slidably installed within the guide groove (9); and The upper guide wheel (11) is installed on the top of the lifting frame (10) and extends into the upper guide rail (2).

3. A folding sliding door system according to claim 2, characterized in that: The lifting frame (10) is vertically provided with an adjustment groove (12), and the height adjustment bolt (13) passes through the adjustment groove (12) and is connected to the base (8) to adjust and lock the relative height between the lifting frame (10) and the base (8).

4. A folding sliding door system according to claim 2, characterized in that: The lifting frame (10) is provided with a height adjustment nut seat (14), and an anti-detachment adjustment bolt (15) is connected inside the height adjustment nut seat (14). An anti-detachment guide wheel (16) is installed on the top of the anti-detachment adjustment bolt (15), and the anti-detachment guide wheel (16) is slidably engaged with the inner back of the upper guide rail (2).

5. A folding sliding door system according to claim 2, characterized in that: The base (8) is provided with a connecting groove (17), and the movable hinge (7) is installed in the connecting groove (17).

6. A folding sliding door system according to claim 5, characterized in that: The base (8) is provided with a connecting bolt (18), which passes through the base (8) and connects to the movable hinge (7) in the connecting groove (17).

7. A folding sliding door system according to claim 2, characterized in that: A first decorative cover (19) is installed on one side of the base (8), and a second decorative cover (20) is installed on the other side of the base (8). The first decorative cover (19) and the second decorative cover (20) cooperate with each other to cover the guide pulley assembly.

8. A folding sliding door system according to claim 1, characterized in that: Several fixed hinges (5) are provided and are installed on the cabinet (1) and the first door (3) in a vertically spaced manner.

9. A folding sliding door system according to claim 1, characterized in that: Several hinges (6) are provided and are installed on the first door body (3) and the second door body (4) in a vertically spaced manner.

10. A folding sliding door system according to claim 2, characterized in that: The upper guide rail is also equipped with a positioning seat (21). The positioning seat (21) has a positioning groove (22) on the side facing the guide pulley group. When the door is closed, the upper guide wheel (11) is engaged in the positioning groove (22).

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