Refrigerator

Abstract

The application provides a refrigerator, which adopts a cylindrical cabinet matched with a guiding structure of double-side hinge shafts and track grooves. The door body moves from the second side to the first side to open the cabinet opening. In the process of opening from the closed position to the first open position, the first hinge shaft moves along the first track groove to the first groove segment extending away from the center axis of the cabinet, which can make the first side of the door body exceed the reference surface formed by the outer peripheral surface of the cabinet, move the whole door body to the outside of the cabinet, not occupy the internal space of the refrigerator, save the overall use space of the refrigerator, facilitate the arrangement of the internal support mechanism and the driving mechanism of the refrigerator, and avoid the interference between the door body movement and the internal mechanism. Meanwhile, the door body is outside the refrigerator after being opened, does not affect the normal arrangement of the refrigerator heat preservation material, and further guarantees the heat preservation effect of the refrigerator and reduces the energy consumption of the refrigeration system.

Description

Technical Field

[0001] This application pertains to the field of refrigerators, and more specifically, relates to a cylindrical refrigerator. Background Technology

[0002] Refrigerators are primarily used for preserving, freezing, and storing food for extended periods. Traditional refrigerators are predominantly rectangular, but cylindrical refrigerators have emerged to address specific applications such as multi-angle display and rotatable internal storage. If these cylindrical refrigerators adopted the hinged door structure of conventional rectangular refrigerators, the door would require a significant amount of space to open. Summary of the Invention

[0003] The purpose of this application is to provide a refrigerator to solve the technical problem that cylindrical refrigerators occupy a large amount of space when the door is opened in the prior art.

[0004] To achieve the above objectives, the technical solution adopted in this application is: to provide a refrigerator, the refrigerator comprising:

[0005] The box is cylindrical and has an opening that connects to the internal space.

[0006] A door; a door for closing an opening, the door including a first side and a second side opposite to the first side, the door being configured to move from the second side toward the first side to open the opening;

[0007] The door is provided with a first hinge and a second hinge, with the first hinge located near the first side and the second hinge located near the second side.

[0008] The housing has a first track groove and a second track groove, a first hinge shaft is disposed in the first track groove, and a second hinge shaft is disposed in the second track groove;

[0009] With the cylindrical surface containing the outer periphery of the box as the reference surface, when the door is in the closed position, at least part of the first side is within the reference surface;

[0010] The door has a first open position. During the process of opening the door from the closed position to the first open position, the first hinge shaft moves along the first groove segment of the first track groove. The first groove segment extends away from the central axis of the box so that the first side extends beyond the reference plane in the first open position.

[0011] Optionally, the door has a second open position; when the door is in the closed position, the second side is at least partially within the reference plane.

[0012] During the process of the door opening from the closed position to the second open position, the second hinge shaft moves along the second groove segment of the second track groove. The second groove segment extends away from the central axis of the box so that the second side extends beyond the reference plane in the second open position.

[0013] Optionally, the opening of the cabinet has a second edge corresponding to the second side of the door, wherein the second edge is the edge of the opening corresponding to the second side when the door is in the closed position;

[0014] Both the first and second groove segments extend in a direction away from the central axis of the box and away from the second edge.

[0015] Optionally, the door has a third opening position, in which the opening degree of the door is greater than that in the first opening position and also greater than that in the second opening position.

[0016] During the process of the door moving from the first opening position to the third opening position, the first hinge shaft moves along the third groove segment of the first track groove. The third groove segment is connected to the first groove segment, and the third groove segment is an arc segment with the central axis of the box as the center.

[0017] During the process of the door moving from the second opening position to the third opening position, the second hinge shaft moves along the fourth groove segment of the second track groove. The fourth groove segment is connected to the second groove segment, and the fourth groove segment is an arc segment with the central axis of the box as the center.

[0018] Optionally, the opening of the cabinet has a first edge corresponding to the first side of the door, wherein the first edge is the edge of the opening corresponding to the first side when the door is in the closed position;

[0019] The first groove segment includes a first sub-section and a second sub-section. The first sub-section extends away from the central axis of the box and away from the first edge, while the second sub-section extends away from the central axis of the box and close to the first edge.

[0020] Optionally, the enclosure includes a side panel, a top panel, and a bottom panel. The side panel is a cylinder with its central axis set vertically. The top panel is located at the top of the side panel, and the bottom panel is located at the bottom of the side panel.

[0021] At least one of the top plate and the bottom plate is provided with a first track groove and a second track groove.

[0022] Optionally, the door body includes a door body and a first upper connecting arm and a second upper connecting arm, the first upper connecting arm being connected to the top of the door body near the first side, and the second upper connecting arm being connected to the top of the door body near the second side.

[0023] The first upper connecting arm is provided with a first hinge at the end away from the door body, and the second upper connecting arm is provided with a second hinge at the end away from the door body;

[0024] The top plate is provided with a first track groove and a second track groove. The first hinge shaft on the first upper connecting arm is disposed in the first track groove on the top plate; the second hinge shaft on the second upper connecting arm is disposed in the second track groove on the top plate.

[0025] Optionally, the first track groove and the second track groove are located on the top surface of the top plate;

[0026] The housing also includes a cover plate, which is placed on the top surface of the top plate to cover the first track groove and the second track groove on the top plate.

[0027] Optionally, the door body includes a door body and a first lower connecting arm and a second lower connecting arm, the first lower connecting arm being connected to the bottom of the door body near the first side, and the second lower connecting arm being connected to the bottom of the door body near the second side.

[0028] The first lower connecting arm is provided with a first hinge at the end away from the door body, and the second lower connecting arm is provided with a second hinge at the end away from the door body;

[0029] The base plate is provided with a first track groove and a second track groove. The first hinge shaft on the first lower connecting arm is located in the first track groove on the base plate; the second hinge shaft on the second lower connecting arm is located in the second track groove on the base plate.

[0030] Optionally, the enclosure also includes a partition located above the bottom plate;

[0031] The first track groove and the second track groove are located on the side of the bottom plate facing the partition. The side of the partition facing the bottom plate has a first guide groove and a second guide groove. The first guide groove is consistent with the trajectory of the first track groove on the bottom plate, and the second guide groove is consistent with the trajectory of the second track groove on the bottom plate.

[0032] The first hinge shaft on the first lower connecting arm has a first guide member at its top, and the first guide member is located in the first guide groove. The second hinge shaft on the second lower connecting arm has a second guide member at its top, and the second guide member is located in the second guide groove.

[0033] The bottom of the first hinge shaft on the first lower connecting arm has a first support member, which is located in the first track groove. The bottom of the second hinge shaft on the second lower connecting arm has a second support member, which is located in the second track groove.

[0034] The beneficial effects of the refrigerator provided in this application are as follows: Compared with the prior art, the refrigerator in this embodiment adopts a cylindrical body with a guide structure of double-sided hinges and track grooves. The door moves from the second side to the first side to open the body opening. During the process of the door opening from the closed position to the first open position, the first hinge moves along the first track groove in a direction away from the central axis of the body, which allows the first side of the door to exceed the reference surface formed by the outer peripheral surface of the body, allowing the entire door to move outward without occupying the internal space of the refrigerator. This saves the overall usable space of the refrigerator and facilitates the arrangement of the internal support and drive mechanisms, avoiding interference between the door movement and the internal mechanisms. At the same time, the door is located outside the refrigerator after opening, which does not affect the normal layout of the refrigerator's insulation material, thereby ensuring the insulation effect of the refrigerator and reducing the energy consumption of the refrigeration system. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of a refrigerator in an embodiment of this application;

[0037] Figure 2 This is a schematic diagram of the refrigerator body in an embodiment of this application;

[0038] Figure 3 This is a schematic diagram of the hinge shaft and track groove when the door is in the closed position in an embodiment of this application;

[0039] Figure 4 This is a schematic diagram of the door in the closed position in an embodiment of this application;

[0040] Figure 5 This is a schematic diagram of the hinge shaft and track groove of the door body moving from the closed position to the first open position in an embodiment of this application;

[0041] Figure 6 This is a schematic diagram of the door in the first open position in an embodiment of this application;

[0042] Figure 7 This is a schematic diagram of the hinge shaft and track groove of the door moving from the closed position to the second open position in an embodiment of this application;

[0043] Figure 8 This is a schematic diagram of the door in the second open position in an embodiment of this application;

[0044] Figure 9 This is a schematic diagram of the hinge shaft and track groove of the door body moving from the first opening position to the third opening position in an embodiment of this application;

[0045] Figure 10 This is a schematic diagram of the hinge shaft and track groove of the door body moving from the second opening position to the third opening position in an embodiment of this application;

[0046] Figure 11 This is a schematic diagram of the door in the third open position in an embodiment of this application;

[0047] Figure 12 This is a schematic diagram of the movement of the first hinge shaft in the first sub-segment and the second sub-segment in an embodiment of this application;

[0048] Figure 13 This is a schematic diagram of the bottom of the refrigerator in an embodiment of this application;

[0049] Figure 14 This is a schematic diagram of the refrigerator lid separation in an embodiment of this application;

[0050] Figure 15 This is a schematic diagram showing the refrigerator cover assembled in an embodiment of this application;

[0051] Figure 16 This is a schematic diagram showing the fit between the base plate and the door in an embodiment of this application;

[0052] Figure 17 This is a schematic diagram of the separation of the base plate in an embodiment of this application;

[0053] Figure 18 This is a schematic diagram of the first lower connecting arm in an embodiment of this application;

[0054] Figure 19 This is a schematic diagram of the second lower connecting arm in an embodiment of this application.

[0055] The reference numerals in the figures are as follows: Box 1; Opening 11; First edge 111; Second edge 112; First track groove 12; First groove segment 121; First sub-segment 1211; Second sub-segment 1212; Third groove segment 122; Second track groove 13; Second groove segment 131; Fourth groove segment 132; Enclosure 14; Top plate 15; Bottom plate 16; Cover plate 17; Partition 18; First guide groove 181; Second guide groove 182; Door 2; Door body 20; First side 201; Second side 202; First hinge 21; First support member 211; First guide member 212; Second hinge 22; Second support member 221; Second guide member 222; First upper connecting arm 23; Second upper connecting arm 24; First lower connecting arm 25; Second lower connecting arm 26; Handle 27; Reference surface 3. Detailed Implementation

[0056] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0057] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0058] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "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 application 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 application.

[0059] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0060] As an indispensable refrigeration and storage device in modern life and various scenarios, the rectangular structure has become the mainstream form of traditional refrigerators in long-term market application. It is suitable for most conventional placement scenarios and can better balance practicality and ease of installation. Therefore, it is widely used in conventional places such as homes and ordinary shops.

[0061] With the diversification of application scenarios, cylindrical refrigerators have emerged as a special form in the market to meet specific needs, such as the need for multi-faceted visual displays in commercial exhibitions or the desire for rotating internal storage spaces in homes to improve the convenience of retrieving items. Compared to traditional rectangular refrigerators, cylindrical refrigerators, with their unique shape and structure, are better suited to multi-faceted display requirements. Furthermore, the rotating internal storage space allows for more efficient access to food, making them valuable in specific commercial and personalized home settings.

[0062] However, if such cylindrical refrigerators adopt the hinged door structure used in conventional cuboid refrigerators, there will be significant space-consuming drawbacks. The hinged door opens by swinging in an arc around the hinge, while the cylindrical refrigerator body is circular. The connection between the door and the body determines that the lateral movement space required when opening is much larger than that of a cuboid refrigerator. The door will occupy more installation and usage space during the swinging process, which not only places greater demands on the width of the placement area, but may also affect the normal use of surrounding equipment or passageways, limiting the application of cylindrical refrigerators in confined spaces.

[0063] To address the issue of hinged doors taking up too much space, some cylindrical refrigerators have adopted a sliding door structure. The core design concept is to allow the door to slide and retract along the refrigerator's casing, significantly reducing the extra space required to open the door and effectively improving space utilization, thus adapting to the placement needs of confined spaces. However, this sliding door structure has unavoidable technical drawbacks: because the door needs to retract into the refrigerator casing, a dedicated area must be reserved on the casing for door storage. This storage area occupies space within the casing, forcing a reduction in the thickness of the refrigerator's insulation layer. The thickness of the insulation layer directly affects the refrigerator's heat preservation performance; a thinner insulation layer exacerbates the loss of cold air inside the refrigerator, increasing the energy consumption of the refrigeration system. It may also lead to decreased internal temperature stability, affecting food preservation.

[0064] In some embodiments of cylindrical rotating refrigerators, a central axis-less structural design is adopted to save effective storage space inside the refrigerator, avoid reducing storage capacity due to the central axis occupying internal space, improve the overall integrity and aesthetics of the refrigerator's interior, and optimize the user experience. However, this central axis-less design means that the rotating support for carrying food cannot be supported and driven by a central axis. Instead, it relies on the internal structure of the refrigerator for support and is driven by an internal drive mechanism. This support and drive method leaves no extra space inside the refrigerator for storing sliding doors, thus making it impossible to apply sliding door structures to this type of central axis-less cylindrical rotating refrigerator.

[0065] To address the aforementioned problems, this application provides a refrigerator; please refer to [link / reference]. Figures 1 to 6 In some embodiments of this application, the refrigerator includes:

[0066] Box 1; Box 1 is cylindrical and has an opening 11 that communicates with the internal space;

[0067] Door 2; Door 2 is an arc-shaped structure adapted to the box 1 to close the opening 11. Door 2 includes a first side 201 and a second side 202 opposite to the first side 201. Door 2 is configured to move from the second side 202 to the first side 201 to open the opening 11.

[0068] The door body 2 is provided with a first hinge 21 and a second hinge 22. The first hinge 21 is located near the first side 201, and the second hinge 22 is located near the second side 202.

[0069] The housing 1 has a first track groove 12 and a second track groove 13, a first hinge shaft 21 is disposed in the first track groove 12, and a second hinge shaft 22 is disposed in the second track groove 13;

[0070] With the cylindrical surface of the outer periphery of the box 1 as the reference surface 3, when the door 2 is in the closed position, the first side 201 is at least partially inside the reference surface 3;

[0071] The door 2 has a first open position. During the process of opening the door 2 from the closed position to the first open position, the first hinge 21 moves along the first groove segment 121 of the first track groove 12. The first groove segment 121 extends away from the central axis of the box body 1 so that the first side 201 extends beyond the reference surface 3 in the first open position.

[0072] like Figure 1 and Figure 2 As shown, the refrigerator in this embodiment includes a cabinet 1 and a door 2. The cabinet 1 has a cylindrical structure and an opening 11 communicating with the internal space for storing and retrieving food. The door 2 closes the opening 11 of the cabinet 1, achieving heat preservation and sealing of the refrigerator's interior. The door 2 is typically an arc-shaped structure adapted to the shape of the cabinet 1, but other shapes may be used in special cases, such as when emphasizing decoration. The door 2 is divided into a first side 201 and a second side 202 arranged opposite each other. The opening method is to move from the second side 202 to the first side 201, thereby opening the opening 11 of the cabinet 1. A handle 27 or other driving structure can usually be provided on the door 2 to drive the opening and closing of the door 2.

[0073] In this embodiment, the connection between the door body 2 and the housing 1 is achieved through the cooperation of hinge pins and track grooves. The door body 2 has two hinge pins, namely a first hinge pin 21 and a second hinge pin 22. The first hinge pin 21 is located near the first side 201 of the door body 2, and the second hinge pin 22 is located near the second side 202 of the door body 2. Correspondingly, the housing 1 has two track grooves, namely a first track groove 12 and a second track groove 13. The first hinge pin 21 is embedded in the first track groove 12, and the second hinge pin 22 is embedded in the second track groove 13. The cooperation between the hinge pins and the track grooves provides guidance and support for the movement of the door body 2.

[0074] like Figure 3 and Figure 4As shown, the cylindrical surface on which the outer periphery of the box 1 is located is taken as the reference surface 3. When the door 2 is in the closed position, at least a part of its first side 201 is located within the reference surface 3, ensuring that the door 2 can fit tightly with the box 1 when closed, avoiding protrusion of the outer periphery of the box 1, reducing space occupation, and ensuring the sealing effect.

[0075] like Figure 5 and Figure 6 As shown, the door 2 has a first open position. During the process of opening from the closed position to the first open position, the first hinge pin 21 moves along the first groove segment 121 of the first track groove 12. It should be noted that in this embodiment, the extension direction of the first groove segment 121 is away from the central axis of the cabinet 1, and this extension direction is not limited to a straight line. As long as the first hinge pin 21 can achieve the effect of moving away from the central axis of the cabinet 1 when moving along the groove segment, it can usually be an arc or a curve. Through this movement, when the first side 201 of the door 2 reaches the first open position, it will exceed the previously set reference surface 3, which is the cylindrical surface where the outer peripheral surface of the cabinet 1 is located. Combined with the movement direction of the door 2 from the second side 202 to the first side 201, the door 2 can be at least partially rotated to the outside of the cabinet 1. This opening method does not occupy the internal space of the refrigerator and has relatively little encroachment on the external space.

[0076] In this embodiment, the movement of the door 2 is achieved by the sliding of the first hinge 21 and the second hinge 22 in the corresponding track grooves. The track grooves provide a fixed path for the movement of the hinges, thereby limiting the movement trajectory of the door 2 and ensuring that the door 2 can smoothly open and close from the second side 202 to the first side 201 in a preset direction, avoiding deviation of the door 2. At the same time, the cooperation between the hinges and the track grooves can also provide stable support for the door 2, ensuring the structural stability of the door 2 when it is opened and closed, replacing the single hinge support method of traditional hinged doors.

[0077] The core limitation of cylindrical refrigerators is their curved outer surface. Traditional hinged doors require significant space due to their curved swing when opened, while sliding doors require internal storage space, a requirement that refrigerators without a central axis cannot meet. Therefore, in this embodiment, the first groove segment 121 is designed to extend away from the central axis of the refrigerator body 1. The core logic is that when the door body 2 is initially opened, the first hinge axis 21 moves along this groove segment, causing the first side 201 of the door body 2 to gradually move away from the central axis of the refrigerator body 1, and then extend from inside the outer peripheral surface of the refrigerator body 1 to outside the reference surface 3. Combined with the preset movement direction of the door body 2 from the second side 202 to the first side 201, the door body 2 can be driven to rotate at least partially to the outside of the refrigerator body 1. This avoids occupying any space inside the refrigerator, thus avoiding the problem of no internal storage space in refrigerators without a central axis. At the same time, compared with the large swing of traditional hinged doors, it also occupies less external space, balancing ease of opening and space utilization.

[0078] Especially for refrigerators without a central axis, the design of the refrigerator without a central axis means that there is no storage space for the door 2 inside the refrigerator. However, the door 2 structure in this embodiment only relies on the hinge to slide in the track groove of the cabinet 1. When opened, it extends away from the central axis of the cabinet 1 instead of retracting inward, without occupying internal space. It is perfectly adapted to refrigerators without a central axis, which solves the above-mentioned technical contradiction and solves the problem that the sliding door 2 cannot be adapted. At the same time, it retains the advantages of the design without a central axis, realizes the dual requirements of space saving and normal opening of the door 2, and breaks through the adaptation limitations of the existing structure.

[0079] Compared to traditional hinged door 2, which occupies a large lateral space due to its arc-shaped swing, in this embodiment, when the door 2 is opened, the first hinge axis 21 moves along the track groove, causing the first side 201 to extend beyond the reference surface 3. Combined with the movement from the second side 202 to the first side 201, the door 2 rotates at least partially to the outside of the cabinet 1. The movement trajectory is more compact, which not only does not occupy the internal space of the refrigerator at all, but also intrudes less on the external space. This effectively reduces the space burden when the door 2 is opened, making it suitable for small placement scenarios, such as small shops and compact family kitchens, thus expanding the application scenarios of cylindrical refrigerators.

[0080] Please see Figure 7 and Figure 8 In some embodiments of this application, the door 2 has a second open position; (in the second open position, the degree of opening of the door 2 is greater than, less than or equal to the degree of opening in the first open position;) when the door 2 is in the closed position, the second side 202 is at least partially within the reference surface 3; during the process of the door 2 opening from the closed position to the second open position, the second hinge shaft 22 moves along the second groove segment 131 of the second track groove 13, and the second groove segment 131 extends in a direction away from the central axis of the housing 1 (note that the extension in the direction away from the central axis of the housing 1 is not limited to a straight line extension; theoretically, as long as the second hinge shaft 22 can move away from the central axis of the housing 1 when moving along the second groove segment 131), so that the second side 202 extends beyond the reference surface 3 in the second open position.

[0081] In this embodiment, the door 2 is further provided with a second opening position. The degree of opening of the door 2 in the second opening position has three corresponding relationships with the degree of opening of the door 2 in the first opening position: greater than, less than, or equal to. The degree of opening can be measured by the opening angle or opening area, etc. A larger opening angle results in a greater degree of opening, and a larger opening area also results in a greater degree of opening. In some possible embodiments, the degree of opening of the door 2 in the second opening position is greater than that in the first opening position. When the door 2 starts moving from the closed position, it will first reach the first opening position to complete the initial opening, and then continue moving along a preset trajectory to the second opening position to achieve a larger opening. In other possible embodiments, the degree of opening of the door 2 in the second opening position is less than that in the first opening position. The door 2 can first move to the second opening position with a smaller opening range to meet the need for small-scale item handling, or it can further move to the first opening position to achieve a larger opening. In some embodiments, the first opening position and the second opening position coincide, and both are the same opening position. When the door 2 moves to this position, it simultaneously meets the state requirements of both the first and second opening positions.

[0082] Please see Figure 4 When the door 2 is in the closed position, at least a portion of the structure of the second side 202 is within the reference surface 3 formed by the outer peripheral surface of the housing 1, thereby ensuring a close fit between the door 2 and the housing 1 and preventing the door 2 from protruding outside the housing 1. Please refer to... Figure 7 During the process of the door 2 opening from the closed position to the second open position, the second hinge pin 22 moves along the second groove segment 131 of the second track groove 13. The second groove segment 131 extends in a direction away from the central axis of the housing 1. This extension is not limited to a straight line, as long as the second hinge pin 22 can gradually move away from the central axis of the housing 1 during its movement along the second groove segment 131. Please refer to... Figure 8 Through the coordinated movement of the second hinge pin 22 and the second groove segment 131, the second side 202 of the door body 2 can extend beyond the reference surface 3 formed by the outer peripheral surface of the box body 1 when it moves to the second open position.

[0083] The trajectory of the second groove segment 131 extending away from the central axis of the housing 1 causes the second side 202 of the door 2 to shift. The directional movement of the second hinge shaft 22 within the second groove segment 131 directly transmits the displacement driving force to the second side 202 of the door 2, causing the second side 202 of the door 2 to gradually leave the area within the reference plane 3 and eventually exceed the reference plane 3, thereby causing the second side 202 of the door 2 to rotate as a whole to the outside of the housing 1.

[0084] The second side 202 of door 2 moves beyond the reference surface 3 and rotates to the outside of the cabinet 1 along with the second hinge 22. Simultaneously, in coordination with the corresponding movement of the first side 201 of door 2, the entire door 2 can be rotated outwards from the cabinet 1. The coordinated guidance of the two sets of hinges and the track groove regulates the movement path of door 2, allowing it to rotate along the outer periphery of the cabinet 1 without intruding into the interior space of the refrigerator.

[0085] Please see Figure 5 and Figure 7 In some embodiments of this application, the opening 11 of the box body 1 has a second edge 112 corresponding to the second side 202 of the door body 2. The second edge 112 is the edge of the opening 11 corresponding to the second side 202 when the door body 2 is in the closed position. The first groove segment 121 and the second groove segment 131 both extend in a direction away from the central axis of the box body 1 and away from the second edge 112.

[0086] In this embodiment, the opening 11 of the box body 1 is provided with a second edge 112 corresponding to the second side 202 of the door body 2. Specifically, the second edge 112 is defined as the edge portion of the opening 11 and the second side 202 of the door body 2 when the door body 2 is in the closed position.

[0087] The first segment 121 of the first track groove 12 and the second segment 131 of the second track groove 13 both extend away from the central axis of the housing 1 and away from the second edge 112 of the opening 11 of the housing 1. Simultaneously, the two segments maintain approximately the same extension direction. This design is crucial for achieving smooth movement of the door 2. The consistent extension direction of the first segment 121 and the second segment 131 allows the user to apply a single force to the door 2, simultaneously driving the first hinge shaft 21 to move smoothly along the first segment 121 and the second hinge shaft 22 to move smoothly along the second segment 131. This avoids problems such as asynchronous hinge movement, uneven force distribution, and movement jamming caused by significant differences in the extension directions of the two segments, ensuring the continuity and smoothness of the overall movement of the door 2.

[0088] For example, a handle 27 can be provided on the second side 202. Pushing the handle 27 will cause the first hinge shaft 21 to move along the first groove 121 and the second hinge shaft 22 to move along the second groove 131.

[0089] The precise cooperation between the first hinge pin 21 and the first groove segment 121, and between the second hinge pin 22 and the second groove segment 131, provides stable guidance and support for the movement of the door body 2, avoiding problems such as offset and shaking when the door body 2 is opened and closed, and improving the structural stability and service life of the door body 2.

[0090] The first groove segment 121 and the second groove segment 131 have roughly the same extension direction and can also be adapted to the motion logic of the door body 2 rotating as a whole to the outside of the cabinet 1 and rotating along the outer periphery of the cabinet 1. Under the synchronous guidance of the double hinge shafts, the door body 2 always completes the opening action along the outside of the cabinet 1 and will not invade the storage space inside the refrigerator. This further optimizes the spatial layout of the cylindrical refrigerator and improves the adaptability of the product in different installation and usage scenarios.

[0091] Please see Figure 9 , Figure 10 and Figure 11 In some embodiments of this application, the door 2 has a third opening position. In the third opening position, the opening degree of the door 2 is greater than that in the first opening position and also greater than that in the second opening position. During the process of the door 2 moving from the first opening position to the third opening position, the first hinge shaft 21 moves along the third groove segment 122 of the first track groove 12. The third groove segment 122 is connected to the first groove segment 121, and the third groove segment 122 is an arc segment with the central axis of the box 1 as its center. During the process of the door 2 moving from the second opening position to the third opening position, the second hinge shaft 22 moves along the fourth groove segment 132 of the second track groove 13. The fourth groove segment 132 is connected to the second groove segment 131, and the fourth groove segment 132 is an arc segment with the central axis of the box 1 as its center.

[0092] The door 2 is also provided with a third opening position. In the third opening position, the opening degree of the door 2 is greater than that in the first and second opening positions, which can achieve a larger opening 11 for exposure, meeting the needs of taking out and putting in large items or cleaning the interior.

[0093] During the movement of the door 2 from the first opening position to the third opening position, the first hinge shaft 21 moves along the third groove segment 122 of the first track groove 12. The third groove segment 122 is interconnected with the first groove segment 121, which can support the continuous movement of the first hinge shaft 21 and ensure that the movement of the door 2 is uninterrupted and without jamming. The third groove segment 122 adopts an arc segment structure with the central axis of the box body 1 as the center, which can keep the distance between the first hinge shaft 21 and the central axis of the box body 1 basically unchanged during the movement, so that the first side 201 of the door 2 can make a stable circumferential movement along the outer periphery of the box body 1.

[0094] During the movement of door 2 from the second opening position to the third opening position, the second hinge shaft 22 moves along the fourth groove segment 132 of the second track groove 13. The fourth groove segment 132 is interconnected with the second groove segment 131 and can form a synchronous motion path with the third groove segment 122, so that the second hinge shaft 22 and the first hinge shaft 21 maintain a coordinated motion state. The fourth groove segment 132 also adopts an arc segment structure with the central axis of the box body 1 as the center, and the arc center and arc direction are consistent with those of the third groove segment 122. This allows the second hinge shaft 22 to maintain a basically constant distance from the central axis of the box body 1 during the movement, thereby enabling the second side 202 of door 2 to rotate circumferentially along the outer periphery of the box body 1 synchronously with the first side 201.

[0095] Within the movement range of the third groove segment 122 and the fourth groove segment 132, the first side 201 of the door body 2 moves along the concentric arc segment with the first hinge axis 21, and the second side 202 of the door body 2 moves along the concentric arc segment with the second hinge axis 22. Both the first side 201 and the second side 202 of the door body 2 maintain a rotational state around the central axis of the box body 1, thereby driving the entire door body 2 to make a stable circumferential rotation around the central axis of the box body 1. This movement mode allows the door body 2 to always move along the external trajectory of the box body 1 without displacement into the box body 1 or interference with the internal storage and drive structure.

[0096] Please see Figure 12 In some embodiments of this application, the opening 11 of the box body 1 has a first edge 111 corresponding to the first side 201 of the door body 2. The first edge 111 is the edge of the opening 11 corresponding to the first side 201 when the door body 2 is in the closed position. The first groove segment 121 includes a first sub-section 1211 and a second sub-section 1212. The first sub-section 1211 extends away from the central axis of the box body 1 and away from the first edge 111. The second sub-section 1212 extends away from the central axis of the box body 1 and close to the first edge 111.

[0097] The opening 11 of the housing 1 is provided with a first edge 111 corresponding to the first side 201 of the door 2. The first edge 111 is defined as the edge portion of the opening 11 and the first side 201 of the door 2 when the door 2 is in the closed position.

[0098] The first groove segment 121 is further divided into a first sub-segment 1211 and a second sub-segment 1212. The two sub-segments, through different extension directions, jointly complete the segmented guidance of the first hinge shaft 21, thereby controlling the step-by-step movement of the first side 201 of the door body 2. The first sub-segment 1211 extends away from the central axis of the housing 1 and away from the first edge 111. During the movement of the first hinge shaft 21 along the first sub-segment 1211, it can drive the first side 201 of the door body 2 away from the first edge 111. Through this segment movement, a sufficient gap is formed between the first side 201 of the door body 2 and the first edge 111 of the opening 11 of the housing 1, effectively avoiding friction, scratching or structural interference between the first side 201 of the door body 2 and the first edge 111 in the initial stage of movement, ensuring the smoothness of the initial opening stage of the door body 2. The second sub-section 1212 extends away from the central axis of the box 1 and closer to the first edge 111. When the first hinge 21 enters the second sub-section 1212 from the first sub-section 1211, it will drive the first side 201 of the door 2 to move towards the first edge 111. While keeping the first side 201 of the door 2 outside the box 1, it will continue to push the door 2 to complete the opening action, so as to gradually expand the opening 11 and meet the opening space required for taking out and putting in food.

[0099] In some embodiments, the first sub-segment 1211 and the second sub-segment 1212 are both arc-shaped and can be connected to form a smooth arc. Through a continuous and smooth arc trajectory, the smoothness of the first hinge axis 21 switching between the two sub-segments can be further improved, the motion resistance can be reduced, and the operation experience of opening and closing the door 2 can be optimized.

[0100] Please see Figure 1 and Figure 13 In some embodiments of this application, the housing 1 includes a surrounding plate 14, a top plate 15 and a bottom plate 16. The surrounding plate 14 is a cylinder with its central axis arranged vertically. The top plate 15 is disposed at the top of the surrounding plate 14 and the bottom plate 16 is disposed at the bottom of the surrounding plate 14. At least one of the top plate 15 and the bottom plate 16 is provided with a first track groove 12 and a second track groove 13.

[0101] In this embodiment, the housing 1 includes a surrounding panel 14, a top plate 15, and a bottom plate 16. The surrounding panel 14 is a cylindrical structure with its central axis arranged vertically. The top plate 15 is assembled at the top of the surrounding panel 14, and the bottom plate 16 is assembled at the bottom of the surrounding panel 14. The surrounding panel 14, top plate 15, and bottom plate 16 together enclose the internal storage space of the housing 1. This structure can ensure the structural regularity of the cylindrical housing 1 and facilitate the processing and assembly of guide structures such as track grooves. In this embodiment, the first track groove 12 and the second track groove 13 are set on at least one of the top plate 15 and the bottom plate 16. Based on the planar structure of the top plate 15 and the bottom plate 16, reliable guarantees can be provided for the forming, dimensional control, and positional accuracy of the track grooves. At the same time, it adapts to the circumferential layout characteristics of the cylindrical surrounding panel 14 and forms a stable assembly relationship with the first hinge pin 21 and the second hinge pin 22 on the door 2.

[0102] The first track groove 12 and the second track groove 13 formed on the top plate 15 or the bottom plate 16 form a precise sliding fit with the first hinge pin 21 and the second hinge pin 22 on the door body 2. The precise fit between the hinge pin and the track groove provides stable guidance and support for the movement of the door body 2, avoiding problems such as offset and shaking when the door body 2 opens and closes, and improving the structural stability and service life of the door body 2. The layout of the track grooves at the top or bottom can provide uniform constraint force from the upper or lower end of the door body 2. Combined with the symmetrical structure of the cylindrical box 1, it further ensures the force balance of the door body 2 during movement, reduces abnormal wear between the hinge pin and the track groove, and maintains the movement accuracy during long-term use.

[0103] In some embodiments of this application, in order to ensure the stability of the opening and closing of the door 2, a first track groove 12 and a second track groove 13 can be provided on the top plate 15 and the bottom plate 16 at the same time. However, it should be noted that the track grooves on the top plate 15 and the bottom plate 16 are required to be consistent to ensure the consistency of the up and down movement of the door 2.

[0104] Please see Figure 14 In some embodiments of this application, the door body 2 includes a door body 20, a first upper connecting arm 23, and a second upper connecting arm 24. The first upper connecting arm 23 is connected to the top of the door body 20 near the first side 201, and the second upper connecting arm 24 is connected to the top of the door body 20 near the second side 202.

[0105] The first upper connecting arm 23 is provided with a first hinge pin 21 at the end away from the door body 20, and the second upper connecting arm 24 is provided with a second hinge pin 22 at the end away from the door body 20.

[0106] The top plate 15 is provided with a first track groove 12 and a second track groove 13. The first hinge shaft 21 on the first upper connecting arm 23 is disposed in the first track groove 12 on the top plate 15; the second hinge shaft 22 on the second upper connecting arm 24 is disposed in the second track groove 13 on the top plate 15.

[0107] In this embodiment, the door body 2 includes a door body 20, a first upper connecting arm 23, and a second upper connecting arm 24. The first upper connecting arm 23 is fixedly connected to the top of the door body 20 near the first side 201, and the second upper connecting arm 24 is fixedly connected to the top of the door body 20 near the second side 202. The two connecting arms are respectively arranged at the two ends of the door body 20, forming a symmetrical and stable extension structure from both sides of the top of the door body 2, providing a reliable structural carrier for the subsequent installation and movement of the hinge pin. A first hinge pin 21 is provided at the end of the first upper connecting arm 23 away from the door body 20, and a second hinge pin 22 is provided at the end of the second upper connecting arm 24 away from the door body 20. The hinge pin and the corresponding connecting arm form an integrated linkage structure, which can move and rotate synchronously with the connecting arm to ensure the continuity of power transmission.

[0108] The top plate 15 of the housing 1 is pre-machined with a first track groove 12 and a second track groove 13. The first hinge pin 21 at the end of the first upper connecting arm 23 is movably assembled inside the first track groove 12 of the top plate 15, and the second hinge pin 22 at the end of the second upper connecting arm 24 is movably assembled inside the second track groove 13 of the top plate 15. The first hinge pin 21 and the first track groove 12, and the second hinge pin 22 and the second track groove 13 form a one-to-one sliding fit relationship. The top plate 15, as a rigid support component, can provide a stable installation reference for the track grooves, and at the same time constrain the movement path of the two hinge pins, so that the hinge pins can only complete the sliding and rotation actions along the extension direction of the preset track grooves, avoiding problems such as offset and shaking when the door 2 is opened and closed, and improving the structural stability and service life of the door 2.

[0109] Please see Figure 14 and Figure 15 In some embodiments of this application, the first track groove 12 and the second track groove 13 are located on the top surface of the top plate 15; the housing 1 also includes a cover plate 17, which covers the top surface of the top plate 15 to block the first track groove 12 and the second track groove 13 on the top plate 15.

[0110] The first track groove 12 and the second track groove 13 are specifically arranged on the top surface of the top plate 15. This arrangement relies on the flat and rigid structural foundation of the top surface of the top plate 15, which facilitates the precise processing and forming of the track grooves and also forms a reasonable spatial alignment with the first upper connecting arm 23 and the second upper connecting arm 24 at the top of the door body 2, providing a regular structural carrier for the assembly and cooperation of the first hinge shaft 21, the second hinge shaft 22 and the corresponding track grooves.

[0111] The housing 1 is also equipped with a cover plate 17, which covers the top surface of the top plate 15 and completely shields the first track groove 12 and the second track groove 13 on the top plate 15. This shielding structure can effectively prevent external dust, moisture, and small debris from entering the track groove, avoiding problems such as hinge movement jamming and wear on the inner wall of the track groove caused by the accumulation of foreign objects, and maintaining the smooth sliding fit between the hinge and the track groove. On the other hand, it can cover the groove structure on the top surface of the top plate 15, eliminating the abrupt appearance caused by the exposed track groove, and improving the overall neatness of the top of the housing 1 and the product's appearance quality.

[0112] Please see Figure 16 In some embodiments of this application, the door body 2 includes a door body 20 and a first lower connecting arm 25 and a second lower connecting arm 26. The first lower connecting arm 25 is connected to the bottom of the door body 20 near the first side 201, and the second lower connecting arm 26 is connected to the bottom of the door body 20 near the second side 202.

[0113] The first lower connecting arm 25 is provided with a first hinge pin 21 at the end away from the door body 20, and the second lower connecting arm 26 is provided with a second hinge pin 22 at the end away from the door body 20.

[0114] The base plate 16 is provided with a first track groove 12 and a second track groove 13. The first hinge shaft 21 on the first lower connecting arm 25 is disposed in the first track groove 12 on the base plate 16; the second hinge shaft 22 on the second lower connecting arm 26 is disposed in the second track groove 13 on the base plate 16.

[0115] In this embodiment, the door body 2 includes a door body 20, a first lower connecting arm 25, and a second lower connecting arm 26. The first lower connecting arm 25 is connected to the bottom of the door body 20 near the first side 201, and the second lower connecting arm 26 is connected to the bottom of the door body 20 near the second side 202. The two lower connecting arms are respectively arranged on the bottom sides of the door body 20, forming a symmetrically distributed bottom connection structure. This provides a stable bottom mounting carrier for the first hinge pin 21 and the second hinge pin 22, ensuring that the installation position of the hinge pins matches the movement requirements of both sides of the door body 2.

[0116] A first hinge pin 21 is provided at the end of the first lower connecting arm 25 away from the door body 20, and a second hinge pin 22 is provided at the end of the second lower connecting arm 26 away from the door body 20. The lower connecting arms and the corresponding hinge pins form a fixed linkage relationship, and can synchronously drive the hinge pins to move with the movement of the door body 20. A first track groove 12 and a second track groove 13 are correspondingly provided on the bottom plate 16 of the housing 1. The first hinge pin 21 on the first lower connecting arm 25 is assembled in the first track groove 12 of the bottom plate 16, and the second hinge pin 22 on the second lower connecting arm 26 is assembled in the second track groove 13 of the bottom plate 16. Through the nested cooperation of the hinge pins and the track grooves, the precise constraint of the movement path of the bottom of the door body 2 is achieved, providing stable guidance and support for the movement of the door body 2, avoiding problems such as offset and shaking when the door body 2 is opened and closed, and improving the structural stability and service life of the door body 2.

[0117] Please see Figure 17 , Figure 18 and Figure 19 In some embodiments of this application, the housing 1 further includes a partition 18, which is located above the bottom plate 16; a first track groove 12 and a second track groove 13 are located on the side of the bottom plate 16 facing the partition 18, and the side of the partition 18 facing the bottom plate 16 has a first guide groove 181 and a second guide groove 182. The first guide groove 181 is aligned with the trajectory of the first track groove 12 on the bottom plate 16, and the second guide groove 182 is aligned with the trajectory of the second track groove 13 on the bottom plate 16. The top of the first hinge shaft 21 on the first lower connecting arm 25 The first guide 212 is located in the first guide groove 181. The second hinge 22 on the second lower connecting arm 26 has a second guide 222 at its top, which is located in the second guide groove 182. The first hinge 21 on the first lower connecting arm 25 has a first support 211 at its bottom, which is located in the first track groove 12. The second hinge 22 on the second lower connecting arm 26 has a second support 221 at its bottom, which is located in the second track groove 13.

[0118] In this embodiment, the housing 1 is further provided with a partition 18, which is arranged above the bottom plate 16. The two form an assembly space that adapts to the movement of the bottom connecting arm and the hinge shaft of the door 2, providing a reasonable structural layout for the two-way cooperation of the hinge shaft. The first track groove 12 and the second track groove 13 are opened on the side of the bottom plate 16 facing the partition 18. The side of the partition 18 facing the bottom plate 16 is correspondingly provided with the first guide groove 181 and the second guide groove 182. The first guide groove 181 and the first track groove 12 have completely consistent trajectories, and the second guide groove 182 and the second track groove 13 have completely consistent trajectories. The upper and lower grooves are designed with the same trajectory, which can provide a unified and accurate motion constraint benchmark for the hinge shaft, ensuring that the movement paths of the upper and lower parts of the hinge shaft are completely coincident, and avoiding problems such as movement misalignment and jamming.

[0119] The first hinge shaft 21 of the first lower connecting arm 25 is provided with a first guide member 212 at its top, which is accommodated in the first guide groove 181 of the partition 18; the second hinge shaft 22 of the second lower connecting arm 26 is provided with a second guide member 222 at its top, which is accommodated in the second guide groove 182 of the partition 18. In terms of specific structural implementation, the first guide member 212 and the second guide member 222 can be bearings. Through the rolling cooperation between the bearings and the guide grooves, the frictional resistance during the guiding process can be greatly reduced. Alternatively, sliding bushings, guide sliders, or other structures can be used to improve structural durability while ensuring guiding accuracy. The bottom of the first hinge shaft 21 is provided with a first support member 211, which is accommodated in the first track groove 12 of the base plate 16; the bottom of the second hinge shaft 22 is provided with a second support member 221, which is accommodated in the second track groove 13 of the base plate 16. The first support member 211 and the second support member 221 can be made of universal rollers to achieve the dual effect of support and flexible rolling, or they can be made of wear-resistant balls, plastic slippers, etc., to adapt to different load-bearing and sliding requirements.

[0120] The first guide member 212 engages with the upper part of the first guide groove 181, and the second guide member 222 engages with the upper part of the second guide groove 182, primarily providing horizontal guidance and limiting, and constraining the circumferential and radial displacement of the hinge shaft. The first support member 211 engages with the lower part of the first track groove 12, and the second support member 221 engages with the lower part of the second track groove 13, primarily providing vertical support and bearing the overall weight of the door body 2. The upper and lower layers work together to form a complete guiding and support system. The precise engagement of the hinge shaft and the track groove provides stable guidance and support for the movement of the door body 2.

[0121] In addition, in some embodiments of this application, the first hinge pin 21 on the first upper connecting arm 23 and the second hinge pin 22 on the second upper connecting arm 24 may also be provided with guides or supports as appropriate.

[0122] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A refrigerator, characterized in that, The refrigerator includes: The box body is cylindrical and has an opening communicating with the internal space. A door; the door is used to close the opening, the door includes a first side and a second side opposite to the first side, the door is configured to move from the second side toward the first side to open the opening; The door body is provided with a first hinge and a second hinge, the first hinge being located near the first side and the second hinge being located near the second side; The door body includes a door body, a first upper connecting arm, and a second upper connecting arm. The first upper connecting arm is connected to the top of the door body near the first side, and the second upper connecting arm is connected to the top of the door body near the second side. The first upper connecting arm is provided with the first hinge pin at the end away from the door body, and the second upper connecting arm is provided with the second hinge pin at the end away from the door body; The housing has a first track groove and a second track groove, the first hinge shaft is disposed in the first track groove, and the second hinge shaft is disposed in the second track groove; Using the cylindrical surface of the outer periphery of the box as a reference surface, when the door is in the closed position, the first side is at least partially within the reference surface; The door has a first open position. During the process of opening the door from the closed position to the first open position, the first hinge shaft moves along the first groove segment of the first track groove. The first groove segment extends away from the central axis of the box body, so that the first side extends beyond the reference surface in the first open position. The second hinge shaft moves along the second groove segment of the second track groove. The second groove segment extends away from the central axis of the box body.

2. The refrigerator as described in claim 1, characterized in that, The door has a second open position; when the door is in the closed position, the second side is at least partially within the reference plane. During the process of the door opening from the closed position to the second open position, the second hinge shaft moves along the second groove segment of the second track groove so that the second side extends beyond the reference surface in the second open position.

3. The refrigerator as described in claim 2, characterized in that, The opening of the box has a second edge corresponding to the second side of the door, and the second edge is the edge of the opening corresponding to the second side when the door is in the closed position; Both the first groove segment and the second groove segment extend in a direction away from the central axis of the housing and away from the second edge.

4. The refrigerator as described in claim 2, characterized in that, The door has a third opening position, in which the opening degree of the door is greater than that in the first opening position and also greater than that in the second opening position. During the process of the door moving from the first opening position to the third opening position, the first hinge shaft moves along the third groove segment of the first track groove. The third groove segment is connected to the first groove segment, and the third groove segment is an arc segment with the central axis of the box as the center. During the process of the door moving from the second opening position to the third opening position, the second hinge shaft moves along the fourth groove segment of the second track groove. The fourth groove segment is connected to the second groove segment, and the fourth groove segment is an arc segment with the central axis of the box as the center.

5. The refrigerator as described in claim 1, characterized in that, The opening of the box has a first edge corresponding to the first side of the door, wherein the first edge is the edge of the opening corresponding to the first side when the door is in the closed position; The first groove segment includes a first sub-segment and a second sub-segment. The first sub-segment extends away from the central axis of the housing and away from the first edge, while the second sub-segment extends away from the central axis of the housing and close to the first edge.

6. The refrigerator as described in any one of claims 1 to 5, characterized in that, The enclosure includes a side panel, a top panel, and a bottom panel. The side panel is a cylinder with its central axis arranged vertically. The top panel is located at the top of the side panel, and the bottom panel is located at the bottom of the side panel. At least one of the top plate and the bottom plate is provided with the first track groove and the second track groove.

7. The refrigerator as described in claim 6, characterized in that, The top plate is provided with a first track groove and a second track groove, and the first hinge shaft on the first upper connecting arm is disposed in the first track groove on the top plate; the second hinge shaft on the second upper connecting arm is disposed in the second track groove on the top plate.

8. The refrigerator as described in claim 7, characterized in that, The first track groove and the second track groove are located on the top surface of the top plate; The housing also includes a cover plate, which is placed on the top surface of the top plate to cover the first track groove and the second track groove on the top plate.

9. The refrigerator as described in claim 6, characterized in that, The door body includes a door body, a first lower connecting arm, and a second lower connecting arm. The first lower connecting arm is connected to the bottom of the door body near the first side, and the second lower connecting arm is connected to the bottom of the door body near the second side. The first hinge pin is provided at the end of the first lower connecting arm away from the door body, and the second hinge pin is provided at the end of the second lower connecting arm away from the door body; The base plate is provided with a first track groove and a second track groove, and the first hinge shaft on the first lower connecting arm is disposed in the first track groove on the base plate; the second hinge shaft on the second lower connecting arm is disposed in the second track groove on the base plate.

10. The refrigerator as described in claim 9, characterized in that, The enclosure also includes a partition, which is located above the bottom plate; The first track groove and the second track groove are located on the side of the base plate facing the partition. The side of the partition facing the base plate has a first guide groove and a second guide groove. The first guide groove is consistent with the trajectory of the first track groove on the base plate, and the second guide groove is consistent with the trajectory of the second track groove on the base plate. The first hinge shaft on the first lower connecting arm has a first guide at its top, and the first guide is located in the first guide groove. The second hinge shaft on the second lower connecting arm has a second guide at its top, and the second guide is located in the second guide groove. The bottom of the first hinge shaft on the first lower connecting arm has a first support member, which is located in the first track groove. The bottom of the second hinge shaft on the second lower connecting arm has a second support member, which is located in the second track groove.

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