Sofa bed and form switching method thereof

Abstract

The invention relates to a sofa bed and a form switching method thereof. The sofa bed comprises a supporting platform base, a plate assembly and a connecting assembly, the plate assembly is composed of a first plate group and a second plate group which are transversely spaced, the first plate group comprises a plurality of first plate bodies which are longitudinally spaced, the second plate group comprises a plurality of second plate bodies which are longitudinally spaced and are in one-to-one correspondence with the first plate bodies, and the first plate bodies are rotatably connected with the second plate bodies; one or more adjacent first plate bodies in the first plate groups are fixedly connected with the supporting platform base, and the fixed number is smaller than the total number of the first plate groups; the connecting assembly comprises a first hinge, a second hinge and a third hinge which are respectively connected with the adjacent first plate bodies, the adjacent second plate bodies and the corresponding first and second plate bodies; in the sofa form, the first plate body and the corresponding second plate body are inclined; all the first plate bodies and the second plate bodies are coplanar in a flat bed form; in the folding bed form, the corresponding first plate body and the second plate body are coplanar, and the first plate body fixedly connected with the supporting platform base is inclined relative to the adjacent first plate body.

Description

Technical Field

[0001] This invention relates to the field of furniture technology, and in particular to a sofa bed and a method for changing its form. Background Technology

[0002] Folding beds and folding sofas are popular in small apartments due to their convenient storage features. The different forms of folding beds are primarily designed to meet ergonomic needs, such as conforming to the body's curves when lying down in different folding configurations. They do not function as sofas; even if forced into sofa mode, some bed panels need to be folded for storage, reducing usable space. Folding sofas, on the other hand, are primarily sofas but also function as beds.

[0003] Currently, most folding sofas on the market, in order to function as beds, typically achieve this by laying the folded portion of the sofa flat. In other words, they achieve a flat bed shape by changing the folding angle. However, this flat bed function is simple, fails to meet ergonomic requirements, and lacks comfort. Another sofa bed solution adds a bed board to the sofa. In sofa mode, the bed board is stored at the bottom of the sofa. To switch to bed mode, the user needs to manually pull out the bed board, which then connects to the flat part of the sofa to form a bed surface. However, this solution requires storing the bed board, resulting in a larger sofa height (twice the height of the bed board) in sofa mode, which is less comfortable compared to traditional sofas.

[0004] The aforementioned sofa bed solutions merely embed the bed form into a sofa without altering its essential nature as a sofa, making it difficult to simultaneously meet users' comfort requirements for both bed and sofa functions. Summary of the Invention

[0005] Therefore, it is necessary to provide a sofa bed and a method for changing its form to address the above problems.

[0006] This invention provides a sofa bed, including a support platform base, a board assembly, and a connecting assembly; wherein, the board assembly includes a first board group and a second board group arranged laterally at intervals along the support platform base, the first board group includes a plurality of first boards arranged longitudinally at intervals, and the second board group includes a plurality of second boards arranged longitudinally at intervals and corresponding one-to-one with the plurality of first boards, the first boards being rotatably connected to the second boards, and one of the first boards or a plurality of adjacent first boards being fixedly connected to the support platform base, and the number of first boards fixedly connected to the support platform base is less than the number of first boards in the first board group; the connecting assembly includes a first hinge, a second hinge, and... A third hinge connects two adjacent first plates, and a second hinge connects two adjacent second plates. The third hinge connects correspondingly arranged first and second plates. When the sofa bed is in sofa mode, the first plates and corresponding second plates are arranged at an angle. When the sofa bed is in flat bed mode, all first plates in the first plate group and all second plates in the second plate group are arranged coplanarly. When the sofa bed is in folding bed mode, the first plates and corresponding second plates are arranged coplanarly, and the first plate fixedly connected to the support platform base in the first plate group is arranged at an angle to another adjacent first plate.

[0007] The sofa bed in this application uses the first panel, whose position is fixed relative to the support platform, as a reference. By changing the inclination of the other first and second panels, three forms of the sofa bed (sofa form, flat bed form, and folding bed form) are achieved. In each form, the flexible support component fits snugly against all the first and second panels of the panel assembly, fully utilizing all panels in the assembly and providing a structural basis for the comfort of the sofa bed in different forms. Compared to traditional folding beds that achieve sofa functionality, in the sofa form, the first or second panel of this application does not need to be folded away, thus utilizing more space. Compared to traditional folding sofas that function as beds, the sofa bed in this application does not require reserved stacking space to achieve the bed function. The height of the flat part in sofa form is lower, so the bottom support point and back support point of the sofa bed can be closer to the body curve of a comfortable sitting posture. The sofa bed in this application can also achieve a folding bed form to better fit the body curve of a comfortable lying posture. In addition, since the sofa bed in this application only changes the tilt angle between the boards when switching between forms, without involving disassembly or stacking operations, the flexible pad on top of the board assembly can adopt an integrated structure. There are no seam problems in the flat bed form, and the lying experience is no different from that of a traditional fixed bed.

[0008] In summary, the sofa bed provided in this application integrates multiple comfortable bed surface forms, rather than simply adding additional bed or sofa functions to existing folding beds or folding sofas. Therefore, in small apartment furniture arrangements, it can better meet the different practical needs of users with limited space. The most basic need is the ability to lie flat. In this case, the sofa bed is in a flat bed form, consistent with a traditional fixed bed. Taking a 1.8m × 2.2m bed as an example, when entertaining guests, the sofa bed is switched to sofa form. At this time, the width of the sofa bed is 2.2m, which can generally comfortably accommodate 4 adults to lie down or sit. For users who have specific requirements for their sleeping posture, the sofa bed can also be switched to folding bed form. The degree of folding of the folding bed form can be finely adjusted according to actual needs to obtain a "zero-pressure bed" lying experience.

[0009] In one embodiment, a plurality of first plates are sequentially arranged along the longitudinal direction of the support platform as a first footboard, a first legboard, a first hipboard, and a first backboard, and a plurality of second plates are sequentially arranged along the longitudinal direction of the support platform as a second footboard, a second legboard, a second hipboard, and a second backboard; the first hipboard is fixedly connected to the support platform; when the sofa bed is in folding bed mode, the first legboard and the first backboard are respectively arranged at an angle to the first hipboard, and the second legboard and the second backboard are respectively arranged at an angle to the second hipboard.

[0010] With this configuration, this application further defines the folding bed form of the sofa bed. The first and second buttocks, as the main load-bearing components supporting the human body, are fixed relative to the support platform in the folding bed form. On this basis, the first and second backrests provide inclined back support, the first and second legrests provide inclined leg support, and the first and second footrests provide inclined foot support. This adapts to the curves of the human body in a comfortable sleeping position from multiple directions, thereby providing a "zero-pressure" lying experience.

[0011] In one embodiment, when the sofa bed is in folding bed mode, the first footboard and the first legboard are arranged at an angle, and the angle between the first footboard and the first hipboard is greater than the angle between the first legboard and the first hipboard; the second footboard and the second legboard are arranged at an angle, and the angle between the second footboard and the second hipboard is greater than the angle between the second legboard and the second hipboard.

[0012] With this configuration, the first or second footboard is used to support the lower legs, and the first and second legboards are used to support the thighs. The relative arrangement of the first footboard and the first legboard, and the relative arrangement of the second footboard and the second legboard, conforms to the shape of the legs in a comfortable lying position, which helps users obtain a more comfortable lying experience.

[0013] In one embodiment, the support platform base includes a first frame and a second frame arranged longitudinally at intervals, and a connector detachably connected to the first frame and the second frame. The first buttock plate includes a first front buttock plate fixedly connected to the first frame and a first rear buttock plate fixedly connected to the second frame.

[0014] With this setup, considering the large size of the sofa bed in the flat bed form, especially the longitudinal dimension which can easily exceed 2m, the support platform seat can be assembled in separate parts to achieve a larger flat bed form under the current transportation specifications. After the first hip board is divided into a first front hip board and a first rear hip board, the first front hip board can be pre-assembled with the separated first frame, and the first rear hip board can be pre-assembled with the separated second frame.

[0015] In one embodiment, the second buttock plate includes a second front buttock plate arranged corresponding to the first front buttock plate and a second rear buttock plate corresponding to the first rear buttock plate.

[0016] With this design, although the second hip board is a movable board when the actual sofa bed mode is switched, dividing the second hip board into a second front hip board and a second rear hip board can reduce the size of a single board in the sofa bed, making it easier to transport.

[0017] In one embodiment, the rotation center of the first hinge is located on the side of the first plate facing the support platform base.

[0018] This configuration helps reduce the squeezing effect of the first hinge on the mattress placed above the panel assembly when the sofa bed is in folding bed mode. At the same time, the gap between the two first panels is larger in this state, and the mattress transitions more smoothly at the panel gap.

[0019] In one embodiment, the rotation center of the second hinge is located on the side of the second plate facing the support platform base.

[0020] This design helps reduce the squeezing effect of the second hinge on the mattress placed above the panel assembly when the sofa bed is in folding mode. At the same time, the gap between the two second panels is larger in this state, and the mattress transitions more smoothly at the panel gaps.

[0021] In one embodiment, a plurality of first plates are sequentially arranged along the longitudinal direction of the support platform as a first foot plate, a first leg plate, a first hip plate, and a first back plate, and a plurality of second plates are sequentially arranged along the longitudinal direction of the support platform as a second foot plate, a second leg plate, a second hip plate, and a second back plate; the first hip plate is fixedly connected to the support platform; a plurality of first hinges are respectively arranged as: a first low-turn point hinge connecting the first foot plate and the first leg plate, a first low-turn point hinge connecting the first leg plate and the first hip plate, and a first plate surface hinge connecting the first hip plate and the first back plate; a plurality of second hinges are respectively arranged as: a second low-turn point hinge connecting the second foot plate and the second leg plate, a second low-turn point hinge connecting the second leg plate and the second hip plate, and a second plate surface hinge connecting the second hip plate and the second back plate.

[0022] This configuration takes into account the small tilt angle of the first back panel relative to the first hip panel and the small tilt angle of the second back panel relative to the second hip panel in the folding bed configuration, as well as the large size of the first and second back panels. Using a first panel hinge to connect the first back panel and the first hip panel, and using a second panel hinge to connect the second back panel and the second hip panel, can improve the rotational stability at the corner connection. The shapes of the first foot panel, second foot panel, first leg panel, and second leg panel are complex. Using a first low-turn-point hinge and a second low-turn-point hinge can reserve rotational margin for the rotation of adjacent two panels.

[0023] In one embodiment, the rotation center of the third hinge is located on the side of the first plate or the second plate away from the support platform base.

[0024] This design takes into account the large angle between the first and second panels of the sofa bed in sofa mode, which can typically reach 70°. The mattress is prone to bulging inward at the corner. By setting a third hinge, a high-turning-point hinge, the mattress can transition evenly at the corner. In sofa mode, the rotation center of the first panel, the third hinge, and the second panel are polygonal angles, which can fully accommodate the deformation of the mattress. At the same time, the third hinge also provides support for the mattress at the rotation center, preventing the mattress from collapsing.

[0025] In one embodiment, the third hinge includes a pivot portion and two rotating portions rotatably connected to the pivot portion. Each rotating portion includes an extension section extending radially from the pivot portion and a bent section extending obliquely from the extension section. The bent section is used to connect the side of the first plate facing the support platform seat or the side of the second plate facing the support platform seat.

[0026] With this design, when the sofa bed is in sofa mode, the extension section can also support the mattress, reducing and preventing localized mattress sagging.

[0027] In one embodiment, the sofa bed further includes a mattress laid on the board assembly, the mattress having a relief groove extending longitudinally along the support platform seat, the third hinge being inserted into the relief groove.

[0028] With this design, the mattress can fill the gaps in the panel components, resulting in a comfortable user experience. The recessed slot is used to accommodate the third hinge, and the interlocking action between the third hinge and the recessed slot can also limit the mattress's position, preventing the sofa bed from shifting when changing its shape.

[0029] In one embodiment, the sofa bed further includes a mattress laid on the panel assembly, the mattress including a zipper assembly surrounding the edge of the panel assembly and a bed body detachably connected to the zipper assembly.

[0030] This design allows the mattress to be laid out to fill the gaps in the board components, resulting in a comfortable user experience. The zipper mechanism allows for detachable connection between the mattress and the board components, making it convenient for washing and changing.

[0031] In one embodiment, the sofa bed further includes a first drive assembly and a second drive assembly; the first drive assembly drives a first plate body movable relative to the support platform seat in the first plate group and a second plate body corresponding to the movable first plate body, so that the sofa bed can switch between the flat bed mode and the folding bed mode; the second drive assembly drives a second plate body connected in the second plate group, so that the sofa bed can switch between the flat bed mode and the sofa mode.

[0032] With this setup, the introduction of the first and second drive components enables intelligent control of the sofa bed's mode switching, eliminating the need for users to manually adjust or fix the board components.

[0033] In one embodiment, a plurality of first plates are sequentially arranged along the longitudinal direction of the support platform as a first foot plate, a first leg plate, a first hip plate, and a first back plate, and a plurality of second plates are sequentially arranged along the longitudinal direction of the support platform as a second foot plate, a second leg plate, a second hip plate, and a second back plate; the first hip plate is fixedly connected to the support platform; the first drive assembly includes a front drive mechanism and a rear drive mechanism, the front drive mechanism being driven and connected to the first back plate and the second back plate, and the rear drive mechanism being driven and connected to the rear drive structure of the first foot plate, the first leg plate, the second foot plate, and the second leg plate.

[0034] With this setup, the first and second plates in the panel assembly are classified accordingly, and the first drive assembly is divided into a front drive mechanism and a rear drive mechanism. The front drive mechanism and the rear drive mechanism can be controlled separately, which facilitates the adjustment of the folding bed's shape, making the sofa bed's folding bed shape closely resemble the human body curves of different people's comfortable lying postures.

[0035] In one embodiment, the front drive mechanism includes a front drive frame rotatably mounted on the support platform base and a front drive motor connected to the front drive frame, the front drive frame having a first pivot extending laterally along the support platform base; when the sofa bed is in folding bed mode, the first back panel and the second back panel abut against the front drive frame.

[0036] This configuration, with the help of the front-drive frame, facilitates the synchronous rotation of the first and second back panels, ensuring the flatness of the back contact surface formed by the first and second back panels.

[0037] In one embodiment, the front drive frame includes a front frame body mounted on the support platform base, a first roller mounted on the front frame body and used to abut against the first back plate, and a second roller mounted on the front frame body and used to abut against the second back plate.

[0038] With this configuration, the first and second rollers can reduce wear between the front drive frame and the first and second back plates. Furthermore, since the front drive frame is in rolling contact with the first and second back plates rather than being fixedly connected, it is less sensitive to assembly errors. Even if there is a deviation in the position of the contact point, the first and second back plates can still rotate around the rotation center of the first hinge, making the possibility of jamming relatively small.

[0039] In one embodiment, the number of first rollers is at least two and they are arranged sequentially at intervals in a direction away from the first rotating axis; the number of second rollers is at least two and they are arranged sequentially at intervals in a direction away from the second rotating axis.

[0040] With this configuration, the first back plate and the second back plate are subjected to balanced forces and rotate stably under the support of multiple spaced first rollers and multiple spaced second rollers.

[0041] In one embodiment, the sofa bed further includes a first sheet metal piece attached to the side of the first back panel facing the support platform seat, and when the sofa bed is in folding bed mode, the first roller abuts against the first sheet metal piece.

[0042] In one embodiment, the sofa bed further includes a second sheet metal piece attached to the side of the second back panel facing the support platform seat, and when the sofa bed is in folding bed mode, the second roller abuts against the second sheet metal piece.

[0043] In one embodiment, the rear drive mechanism includes a rear drive frame rotatably connected to the support platform seat and a rear drive motor connected to the rear drive frame, the rear drive frame having a second pivot extending laterally along the support platform seat; when the sofa bed is in folding bed mode, the first leg plate and the second leg plate abut against the rear drive frame.

[0044] With this configuration, when the sofa bed switches between folding bed mode and flat bed mode, the rear drive frame provides support for the first and second leg panels, ensuring that the first and second leg panels are arranged on the same plane.

[0045] In one embodiment, the first leg plate is fixedly connected to the rear drive frame.

[0046] With this setup, the position of the first legboard is determined during the sofa bed's mode switching and adjustment process. When further adjusting the footboard, the footboard uses the position of the legboard as a reference, resulting in minimal positional deviation.

[0047] In one embodiment, the rear drive mechanism further includes a first auxiliary support member rotatably mounted on the support platform base, the auxiliary support member having a third pivot extending laterally along the support platform base, and one end of the first auxiliary support member remote from the third pivot is rotatably connected to the first foot plate.

[0048] With this configuration, the first auxiliary support member connecting the first footboard and the support platform seat in this application can reduce the positional deviation of the first footboard. When the sofa bed is in the folding bed mode, the first auxiliary support member, together with the first hinge, the first legboard and the rear drive frame, provides support to ensure the positional stability of the first footboard in the folding bed mode and during the adjustment process.

[0049] In one embodiment, the second drive assembly includes a balance frame fixedly connected to the second hip plate and extending longitudinally along the support platform seat, and a drive mechanism connected to the balance frame; when the sofa bed is in sofa mode, the second foot plate, the second leg plate, the second hip plate and the second back plate abut against the balance frame.

[0050] With this configuration, the balance frame provides support for the second footboard, second legboard, second hipboard, and second backboard, enabling the sofa bed to intelligently switch to sofa mode under the drive of the central drive mechanism.

[0051] In one embodiment, the second drive assembly further includes a second auxiliary support member whose two ends are rotatably connected to the second foot plate and the balance frame, respectively; when the sofa bed is in folding bed mode or flat bed mode, the second auxiliary support member has a third pivot extending laterally along the support platform seat and close to the balance frame.

[0052] With this setup, without affecting the sofa function of the sofa bed, the second auxiliary support connects the balance frame and the second footboard to provide additional support for the second footboard. When the sofa bed is in folding bed mode, the position of the second footboard is more stable and less prone to wobbling.

[0053] In one embodiment, the central drive mechanism includes a central drive frame rotatably mounted on the support platform base and a central drive motor connected to the central drive frame, the central drive frame having a fourth pivot extending longitudinally along the support platform base; when the sofa bed is in sofa mode, the second buttocks abut against the central drive frame.

[0054] With this configuration, the second hip board is located in the center of the sofa bed. When the sofa bed is in sofa mode, the central drive frame drives the second hip board to rotate, thereby driving the balance frame to rotate and supporting the rotation of all the boards in the second board group. The sofa bed is in a state of overall force balance during mode switching and in sofa mode, and the structure is stable.

[0055] In one embodiment, the central drive frame includes a central frame body mounted on the support platform base and a third roller mounted on the central frame body; when the sofa bed is in sofa mode, the second hip plate abuts against the third roller.

[0056] With this configuration, the third roller can reduce wear between the central drive frame and the second hip plate. Furthermore, since the central drive frame and the second hip plate are connected by rolling contact rather than a fixed connection, they are less sensitive to assembly errors. Even if the contact point deviates, the second hip plate can still rotate around the rotation center of the third hinge, making jamming less likely.

[0057] In one embodiment, the central drive frame further includes at least one fourth roller mounted on the central frame body, the fourth roller and the third roller being arranged longitudinally spaced along the support platform seat; when the sofa bed is in sofa mode, at least one second plate in the second plate group abuts against the fourth roller.

[0058] This configuration, with the fourth and third rollers working together, allows for a more reasonable distribution of force between the second hip plate and the central drive frame, reducing the deformation burden on the balance frame and making the sofa bed's shape more stable.

[0059] In one embodiment, the sofa bed further includes a third sheet metal piece attached to the side of the second hip board facing the support platform seat, and when the sofa bed is in folding bed mode, the third roller abuts against the third sheet metal piece.

[0060] In one embodiment, the sofa bed further includes a fourth sheet metal piece attached to the side of the second leg plate facing the support platform seat, and when the sofa bed is in folding bed mode, the fourth roller abuts against the fourth sheet metal piece.

[0061] In one embodiment, the sofa bed further includes a pad assembly mounted on the side of the board assembly facing the support platform seat; when the sofa bed is in a flat bed configuration, the side of the pad assembly facing away from the board assembly abuts against the support platform seat.

[0062] With this configuration, when the sofa bed is in the flat bed position, the additional support of the pad assembly can improve the stress distribution of each plate in the support platform base and board assembly, which helps to reduce abnormal noise caused by excessive load at local connection points and improves the user experience.

[0063] According to another aspect of this application, this application also provides a method for switching the mode of a sofa bed, comprising the following steps: S1 receives the mode switching command; S2 detects the current state of the sofa bed; S3 determines whether the current sofa bed is in a flat bed configuration; If S4 is correct, the sofa bed's form will be changed according to the form switching command; otherwise, the current sofa bed's form will be changed to a flat bed form, and the process will return to S2.

[0064] This setup, through form detection of the sofa bed, ensures that the sofa bed always maintains a flat bed form as the baseline during form switching. For example, when the sofa bed switches between sofa and folding bed forms, it is forced to transition to a flat bed form to ensure the successful form switching and prevent command conflicts when the sofa bed deforms. Attached Figure Description

[0065] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology 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.

[0066] Figure 1 This is a structural diagram of a sofa bed in a flat bed configuration according to one embodiment of this application; Figure 2 for Figure 2 The diagram shows the structural components of the sofa bed excluding the mattress. Figure 3 for Figure 2 The diagram shows a partial structural illustration of the sofa bed in sofa mode. Figure 4 for Figure 3 A structural schematic diagram of a sofa bed in the form of a sofa, viewed from another angle; Figure 5 for Figure 2 The diagram shows a partial structural illustration of the sofa bed in its folding bed configuration. Figure 6 for Figure 5 A structural schematic diagram of a sofa bed in the form of a folding bed, shown from another perspective; Figure 7 for Figure 2 A schematic diagram of the back structure of the sofa bed shown; Figure 8 for Figure 7 The diagram shows the structure of the plate assembly, the connecting assembly, and the gasket assembly in the structure shown. Figure 9 A schematic diagram of the structure of the first hinge or the second hinge in one embodiment provided in this application; Figure 10 A schematic diagram of the structure of the first hinge or the second hinge in another embodiment provided in this application; Figure 11 This application provides a schematic diagram of the structure of the third hinge in one embodiment. Figure 12 for Figure 7 A schematic diagram of the supporting platform base in the structure shown; Figure 13 for Figure 7 A schematic diagram of the front-drive mechanism in the structure shown; Figure 14 for Figure 7 A schematic diagram of the rear drive mechanism in the structure shown; Figure 15 for Figure 7 A schematic diagram of the drive mechanism in the structure shown; Figure 16 A schematic diagram of the structure of the mattress in a sofa bed according to one embodiment of this application.

[0067] Figure label: 10. Support platform base; 11. First frame; 12. Second frame; 13. Connector; 14. Anchor point; 20. Plate assembly; 21. First plate body; 211. First foot plate; 212. First leg plate; 213. First hip plate; 2131. First front hip plate; 2132. First rear hip plate; 214. First back plate; 22. Second plate body; 221. Second foot plate; 222. Second leg plate; 223. Second hip plate; 2231. Second front hip plate; 2232. Second rear hip plate; 224. Second back plate; 30. Connecting component; 31. First hinge; 32. Second hinge; 33. Third hinge; 34. Fourth hinge; 40. Gasket assembly; 41. First gasket; 42. Second gasket; 43. Third gasket; 44. First sheet metal part; 45. Second sheet metal part; 46. Third sheet metal part; 47. Fourth sheet metal part; 50. Mattress; 501. Spacer groove; 60. First drive assembly; 61. Front drive mechanism; 611. Front drive frame; 6111. Front frame body; 6112. First roller; 6113. Second roller; 612. Front drive motor; 62. Rear drive mechanism; 621. Rear drive frame; 6211. First rear frame body; 6212. Fifth hinge; 6213. Second rear frame body; 622. Rear drive motor; 623. First auxiliary support component; 70. Second drive assembly; 71. Central drive mechanism; 711. Central drive frame; 7111. Main body of central frame; 7112. Third roller; 7113. Fourth roller; 712. Central drive motor; 72. Balance frame; 73. Second auxiliary support component. Detailed Implementation

[0068] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0069] 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 the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0070] 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 at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0071] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0072] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0073] Existing folding beds and sofas are limited in function, and switching to another form inevitably results in a decrease in comfort or space utilization, failing to meet the needs of small apartments. This application provides a sofa bed that, by coupling three forms, fully utilizes the entire load-bearing surface of the sofa bed in all forms, and meets the user's comfort needs in all different forms.

[0074] like Figures 1 to 7 As shown, in one embodiment of this application, the sofa bed specifically includes a support platform base 10, a board assembly 20, a connecting assembly 30, a pad assembly 40, a mattress 50, a first drive assembly 60, and a second drive assembly 70.

[0075] refer to Figure 2The plate assembly 20 includes a first plate group and a second plate group arranged laterally along the support platform seat 10. The first plate group includes a plurality of first plate bodies 21 arranged longitudinally. The second plate group includes a plurality of second plate bodies 22 arranged longitudinally and corresponding one-to-one with the plurality of first plate bodies 21. The first plate bodies 21 are rotatably connected to the second plate bodies 22. One of the first plate bodies 21 or the plurality of adjacent first plate bodies 21 are fixedly connected to the support platform seat 10, and the number of first plate bodies 21 fixedly connected to the support platform seat 10 is less than the number of first plate bodies 21 in the first plate group.

[0076] refer to Figure 2 and Figure 8 The connecting component 30 includes a first hinge 31, a second hinge 32 and a third hinge 33. The first hinge 31 connects two adjacent first plates 21, the second hinge 32 connects two adjacent second plates 22, and the third hinge 33 connects the corresponding first plates 21 and second plates 22.

[0077] refer to Figure 3 and Figure 4 When the sofa bed is in sofa mode, the first panel 21 and the corresponding second panel 22 are arranged at an angle.

[0078] refer to Figure 2 When the sofa bed is in the flat bed mode, all the first panels 21 in the first panel group and all the second panels 22 in the second panel group are arranged on the same plane.

[0079] refer to Figure 5 and Figure 6 When the sofa bed is in folding bed mode, the first plate 21 and the corresponding second plate 22 are arranged coplanarly, and the first plate 21 fixedly connected to the support platform base 10 in the first plate group is arranged at an angle to the other adjacent first plate 21.

[0080] Please continue to refer to this. Figure 2 and Figure 7 The plurality of first plates 21 are sequentially arranged along the longitudinal direction of the support platform base 10 as a first foot plate 211, a first leg plate 212, a first hip plate 213, and a first back plate 214; the plurality of second plates 22 are sequentially arranged along the longitudinal direction of the support platform base 10 as a second foot plate 221, a second leg plate 222, a second hip plate 223, and a second back plate 224; the first hip plate 213 is fixedly connected to the support platform base 10, specifically with… Figure 8The support platform 10 shown is fixed by six anchor points 14 (the first front hip plate 2131 is equipped with four anchor points 14, and the first rear hip plate 2132 is equipped with two anchor points 14). When the sofa bed is in the folding bed mode, the first leg plate 212 and the first back plate 214 are respectively inclined to the first hip plate 213, and the second leg plate 222 and the second back plate 224 are respectively inclined to the second hip plate 223. The first hip plate 213 and the second hip plate 223 serve as the main load-bearing components supporting the human body. In the folding bed mode, the two hip plates are fixed relative to the support platform 10. On this basis, the first back plate 214 and the second back plate 224 are used to provide inclined back support, the first leg plate 212 and the second leg plate 222 are used to provide inclined leg support, and the first foot plate 211 and the second foot plate 221 are used to provide inclined foot support. They adapt to the curves of the human body in a comfortable sleeping position from multiple directions, thereby providing a "zero-pressure" lying experience.

[0081] like Figure 5 and Figure 6 As shown, in one embodiment, when the sofa bed is in folding bed mode, the first footboard 211 and the first legboard 212 are arranged at an angle, and the angle between the first footboard 211 and the first hipboard 213 is greater than the angle between the first legboard 212 and the first hipboard 213; the second footboard 221 and the second legboard 222 are arranged at an angle, and the angle between the second footboard 221 and the second hipboard 223 is greater than the angle between the second legboard 222 and the second hipboard 223. The first footboard 211 or the second footboard 221 is used to support the lower legs of the human body, and the first legboard 212 and the second legboard 222 are used to support the thighs of the human body. The relative arrangement of the first footboard 211 and the first legboard 212, and the relative arrangement of the second footboard 221 and the second legboard 222 conform to the shape of the human body's legs in a comfortable lying position, which helps the user to obtain a more comfortable lying experience.

[0082] Considering the large size of sofa beds in their flat-bed configuration, especially with the longitudinal dimension easily exceeding 2 meters, resulting in higher transportation costs, such as... Figure 2 , Figure 7 and Figure 12As shown, the support platform base 10 includes a first frame 11 and a second frame 12 arranged longitudinally at intervals, and a connector 13 detachably connected to the first frame 11 and the second frame 12. The first hip plate 213 includes a first front hip plate 2131 fixedly connected to the first frame 11 and a first rear hip plate 2132 fixedly connected to the second frame 12. After dividing the first hip plate 213 into a first front hip plate 2131 and a first rear hip plate 2132, the first front hip plate 2131 can be pre-assembled with the separated first frame 11, and the first rear hip plate 2132 can be pre-assembled with the separated second frame 12. Correspondingly, the second hip plate 223 includes a second front hip plate 2231 corresponding to the first front hip plate 2131 and a second rear hip plate 2232 corresponding to the first rear hip plate 2132. This reduces the size of individual panels in the sofa bed, facilitating transportation.

[0083] Please refer to the following: Figure 5 , Figure 6 and Figure 9 , Figure 10 The rotation center of the first hinge 31 is located on the side of the first plate 21 facing the support platform seat 10. When the sofa bed is in folding bed mode, this helps reduce the squeezing effect of the first hinge 31 on the mattress 50 placed above the plate assembly 20. Simultaneously, the gap between the two first plates 21 is larger in this state, allowing the mattress 50 to transition more smoothly at the plate gaps. The rotation center of the second hinge 32 is located on the side of the second plate 22 facing the support platform seat 10. When the sofa bed is in folding bed mode, this helps reduce the squeezing effect of the second hinge 32 on the mattress 50 placed above the plate assembly 20. Simultaneously, the gap between the two second plates 22 is larger in this state, allowing the mattress 50 to transition more smoothly at the plate gaps.

[0084] like Figure 7 and Figure 9 As shown, the plurality of first hinges 31 serve as: a first low-turn point hinge connecting the first foot plate 211 and the first leg plate 212, a first leg plate 212 and the first hip plate 213, and a first plate-face hinge connecting the first hip plate 213 and the first back plate 214. Considering that the tilt angle of the first back plate 214 relative to the first hip plate 213 is small in the folding bed configuration, the tilt angle of the second back plate 224 relative to the second hip plate 223 is small, and the sizes of the first back plate 214 and the second back plate 224 are large, using a first plate-face hinge to connect the first back plate 214 and the first hip plate 213 and using a second plate-face hinge to connect the second back plate 224 and the second hip plate 223 can improve the rotational stability at the corner connection.

[0085] like Figure 7 and Figure 10As shown, the multiple second hinges 32 serve as: a second low-turn-point hinge connecting the second foot plate 221 and the second leg plate 222, a second leg plate 222 and the second hip plate 223, and a second plate surface hinge connecting the second hip plate 223 and the second back plate 224. The shapes of the first foot plate 211, second foot plate 221, first leg plate 212, and second leg plate 222 are complex. Using first and second low-turn-point hinges allows for a rotational allowance to be reserved for the rotation of adjacent plates.

[0086] Please refer to the following: Figure 3 , Figure 4 and Figure 11 Considering the large angle between the first panel 21 and the second panel 22 in sofa mode, typically reaching 70°, the mattress 50 is prone to bulging inwards at the corner. The rotation center of the third hinge 33 is located on the side of the first panel 21 or the second panel 22 away from the support platform 10. By setting the third hinge 33 as a high-turning-point hinge, the transition of the mattress 50 at the corner can be smooth. In sofa mode, the rotation center of the first panel 21, the third hinge 33, and the second panel 22 form polygonal angles, fully accommodating the deformation of the mattress 50. Simultaneously, the third hinge 33 also provides support for the mattress 50 at the rotation center, preventing the mattress 50 from collapsing.

[0087] Specifically, the third hinge 33 includes a pivot portion and two rotating portions rotatably connected to the pivot portion. Each rotating portion includes an extension section extending radially from the pivot portion and a bent section extending obliquely from the extension section. The bent section connects either the side of the first plate 21 facing the support platform 10 or the side of the second plate 22 facing the support platform 10. When the sofa bed is in sofa mode, the extension section also provides support for the mattress 50, reducing localized sagging of the mattress 50.

[0088] Furthermore, such as Figure 1 and Figure 16 As shown, the sofa bed also includes a mattress 50 laid on the panel assembly 20. The mattress 50 has a recessed groove 501 extending longitudinally along the support platform seat 10, and the third hinge 33 is inserted into the recessed groove 501. The mattress 50 can fill the seams in the panel assembly 20, thereby bringing a comfortable user experience. The recessed groove 501 is designed to accommodate the third hinge 33, and the engagement between the third hinge 33 and the recessed groove 501 can also limit the position of the mattress 50, preventing the sofa bed from shifting as a whole when changing its shape.

[0089] Optionally, in one embodiment of this application, the mattress 50 includes a zipper assembly (not shown) surrounding the edge of the board assembly 20, and the bed body is detachably connected to the zipper assembly. The mattress 50 can fill the seams in the board assembly 20, thus providing a comfortable user experience. The zipper mechanism allows for a detachable connection between the mattress 50 and the board assembly 20, facilitating washing and replacement.

[0090] Please refer to the following: Figure 5 , Figure 6 , Figure 7 The first drive assembly 60 includes a front drive mechanism 61 and a rear drive mechanism 62. The front drive mechanism 61 is driven and connected to the first back plate 214 and the second back plate 224, and the rear drive mechanism 62 is driven and connected to the rear drive structure of the first foot plate 211, the first leg plate 212, the second foot plate 221, and the second leg plate 222.

[0091] Further reference Figure 13 The front drive mechanism 61 includes a front drive frame 611 rotatably mounted on the support platform seat 10 and a front drive motor 612 connected to the front drive frame 611. The front drive frame 611 has a first pivot extending laterally along the support platform seat 10. When the sofa bed is in folding bed mode, the first back panel 214 and the second back panel 224 abut against the front drive frame 611. The front drive frame 611 includes a front frame body 6111 mounted on the support platform seat 10, a first roller 6112 mounted on the front frame body 6111 and used to abut against the first back panel 214, and a second roller 6113 mounted on the front frame body 6111 and used to abut against the second back panel 224. The first pivot is spaced apart from the rotation center of the first or second panel hinge.

[0092] Furthermore, to increase the rotational stability of the first back plate 214 and the second back plate 224, the number of the first rollers 6112 is at least two and they are arranged sequentially at intervals in a direction away from the first axis of rotation; the number of the second rollers 6113 is at least two and they are arranged sequentially at intervals in a direction away from the second axis of rotation. In one embodiment provided in this application, the number of the first rollers 6112 and the second rollers 6113 are each two and the first rollers 6112 and the second rollers 6113 are arranged symmetrically.

[0093] Considering that the panel is usually made of wood, in order to protect the wooden panel surface, the sofa bed also includes a first sheet metal part 44 attached to the side of the first back panel 214 facing the support platform seat 10. When the sofa bed is in folding bed mode, the first roller 6112 abuts against the first sheet metal part 44. The sofa bed also includes a second sheet metal part 45 attached to the side of the second back panel 224 facing the support platform seat 10. When the sofa bed is in folding bed mode, the second roller 6113 abuts against the second sheet metal part 45.

[0094] Please see Figure 5 , Figure 6 , Figure 7 The rear drive mechanism 62 includes a rear drive frame 621 rotatably connected to the support platform 10 and a rear drive motor 622 connected to the rear drive frame 621. The rear drive frame 621 has a second pivot extending laterally along the support platform 10. When the sofa bed is in folding bed mode, the first leg plate 212 and the second leg plate 222 abut against the rear drive frame 621. When the sofa bed switches between folding bed mode and flat bed mode, the rear drive frame 621 provides support for the first leg plate 212 and the second leg plate 222, ensuring that the first leg plate 212 and the second leg plate 222 are arranged in the same plane.

[0095] Optionally, in one embodiment, the first leg plate 212 is fixedly connected to the rear drive frame 621. During the sofa bed's mode switching and adjustment process, the position of the first leg plate 212 is determined, and when the footboard is further adjusted subsequently, the footboard uses the position of the leg plate as a reference, resulting in a small positional deviation.

[0096] Please see Figure 14The rear drive mechanism 62 further includes a first auxiliary support member 623 rotatably mounted on the support platform seat 10. The auxiliary support member has a third pivot extending laterally along the support platform seat 10. One end of the first auxiliary support member 623 away from the third pivot is rotatably connected to the first foot plate 211. The first auxiliary support member 623 connects the first foot plate 211 and the support platform seat 10, which can reduce the positional deviation of the first foot plate 211. When the sofa bed is in the folding bed mode, the first auxiliary support member 623, together with the first hinge 31, the first leg plate 212 and the rear drive frame 621, provides support to ensure the positional stability of the first foot plate 211 in the folding bed mode and during adjustment. The rear drive frame 621 includes a fifth hinge 6212 and a first rear frame body 6211 and a second rear frame body 6213 respectively connected to the fifth hinge 6212. The first rear frame body 6211 is used to support the first leg plate 212 and the second leg plate 222, and the second rear frame body 6213 is used to support the first foot plate 211 and the second foot plate 221. The drive shaft of the rear drive motor 622 is connected to the first rear frame body 6211.

[0097] Please see Figure 3 , Figure 4 , Figure 7 The second drive assembly 70 includes a balance frame 72 fixedly connected to the second hip plate 223 and extending longitudinally along the support platform seat 10, and a drive mechanism 71 connected to the balance frame 72; when the sofa bed is in sofa mode, the second foot plate 221, the second leg plate 222, the second hip plate 223 and the second back plate 224 abut against the balance frame 72.

[0098] Please refer to it again. Figure 5 The second drive assembly 70 further includes a second auxiliary support member 73, with both ends rotatably connected to the second footplate 221 and the balance frame 72, respectively. When the sofa bed is in folding bed mode or flat bed mode, the second auxiliary support member 73 has a third pivot extending laterally along the support platform seat 10 and close to the balance frame 72. Without affecting the sofa function of the sofa bed, the second auxiliary support member 73 connects the balance frame 72 and the second footplate 221 to provide additional support for the second footplate 221. When the sofa bed is in folding bed mode, the position of the second footplate 221 is more stable and less prone to wobbling.

[0099] Please refer to further information. Figure 15The central drive mechanism 71 includes a central drive frame 711 rotatably mounted on the support platform 10 and a central drive motor 712 connected to the central drive frame 711. The central drive frame 711 has a fourth rotating shaft extending longitudinally along the support platform 10. When the sofa bed is in sofa mode, the second hip plate 223 abuts against the central drive frame 711. The second hip plate 223 is located at the center of the sofa bed. When the sofa bed is in sofa mode, the central drive frame 711 drives the second hip plate 223 to rotate, thereby driving the balance frame 72 to rotate, thus supporting the rotation of all the panels in the second panel group. The sofa bed is in overall force balance during mode switching and in sofa mode, and the structure is stable.

[0100] Furthermore, the central drive frame 711 includes a central frame body 7111 mounted on the support platform base 10 and a third roller 7112 mounted on the central frame body 7111. When the sofa bed is in sofa mode, the second hip plate 223 abuts against the third roller 7112. The third roller 7112 reduces wear between the central drive frame 711 and the second hip plate 223. Furthermore, the rolling contact between the central drive frame 711 and the second hip plate 223, rather than a fixed connection, reduces sensitivity to assembly errors. Even if the contact point deviates, the second hip plate 223 can still rotate around the rotation center of the third hinge 33, minimizing the possibility of jamming.

[0101] Furthermore, the central drive frame 711 also includes at least one fourth roller 7113 mounted on the central frame body 7111. The fourth roller 7113 and the third roller 7112 are arranged longitudinally at intervals along the support platform seat 10. When the sofa bed is in sofa mode, at least one second plate 22 in the second plate group abuts against the fourth roller 7113. The cooperation of the fourth roller 7113 and the third roller 7112 can make the force distribution between the second hip plate 223 and the central drive frame 711 more reasonable, reduce the deformation burden of the balance frame 72, and make the sofa bed more stable in sofa mode.

[0102] It is understood that in other embodiments, if space is sufficient, the number of fourth rollers 7113 may also be two or more, further reducing the deformation of the balance frame 72 and the plate.

[0103] Combination Figure 15 and Figure 9 To avoid interference between the drive shaft end of the central drive motor 712 and the second rear plate 223, the second rear plate 223 is provided with a clearance groove. At the same time, the connecting assembly 30 also includes a plurality of fourth hinges 34, which connect the second front rear plate 2231 and the second rear rear plate 2232 to enhance the structural strength between the second front rear plate 2231 and the second rear rear plate 2232.

[0104] refer to Figure 7 and Figure 6 The sofa bed further includes a third sheet metal part 46 attached to the side of the second hip plate 223 facing the support platform seat 10. When the sofa bed is in folding bed mode, the third roller 7112 abuts against the third sheet metal part 46. The sofa bed also includes a fourth sheet metal part 47 attached to the side of the second leg plate 222 facing the support platform seat 10. When the sofa bed is in folding bed mode, the fourth roller 7113 abuts against the fourth sheet metal part 47.

[0105] like Figure 7 As shown, combined Figure 4 The support platform base 10 provided in this application is a frame structure, that is, it consists of an outer frame and multiple crossbeams arranged at intervals along the longitudinal direction. In order to ensure that the support platform base 10 is subjected to reasonable force and avoid the problem of abnormal noise caused by excessive concentrated force at local nodes, the shim assembly 40 includes multiple shims disposed between the plate and the support platform base 10, specifically divided into a first shim 41, a second shim 42, and a third shim 43. The first shim 41 is located at the balance frame 72 and is used to support the second leg plate 222 and the second hip plate 223, and is in the shape of a disc. The second shim 42 is located on both sides of the support platform base 10 and is used to support the first foot plate 211, the second foot plate 221, the first back plate 214, and the second back plate 224, and is in the shape of an inverted trapezoid. The third shim 43 is used to support the front drive frame 611, the rear drive frame 621, and the middle drive frame 711, and is in the shape of a rectangular column.

[0106] According to another aspect of this application, this application also provides a method for switching the mode of a sofa bed, comprising the following steps: S1 receives the mode switching command; S2 detects the current state of the sofa bed; S3 determines whether the current sofa bed is in a flat bed configuration; If S4 is correct, the sofa bed's form will be changed according to the form switching command; otherwise, the current sofa bed's form will be changed to a flat bed form, and the process will return to S2.

[0107] By detecting the shape of the sofa bed, it is ensured that the sofa bed always maintains a flat bed shape as the baseline during shape switching. For example, when the sofa bed switches between sofa shape and folding bed shape, the transition to flat bed shape is forced to ensure the successful transition and prevent command conflicts when the sofa bed deforms.

[0108] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0109] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.

Claims

1. A sofa bed, characterized in that, include: Support platform base (10); The plate assembly (20) includes a first plate group and a second plate group arranged laterally at intervals along the support platform base (10). The first plate group includes a plurality of first plate bodies (21) arranged longitudinally at intervals. The second plate group includes a plurality of second plate bodies (22) arranged longitudinally at intervals and corresponding one-to-one with the plurality of first plate bodies (21). The first plate bodies (21) are rotatably connected to the second plate bodies (22). One of the first plates (21) or a plurality of adjacent first plates (21) are fixedly connected to the support platform base (10), and the number of the first plates (21) fixedly connected to the support platform base (10) is less than the number of the first plates (21) of the first plate group. The connecting assembly (30) includes a first hinge (31), a second hinge (32) and a third hinge (33). The first hinge (31) connects two adjacent first plates (21), the second hinge (32) connects two adjacent second plates (22), and the third hinge (33) connects the corresponding first plates (21) and second plates (22). When the sofa bed is in sofa mode, the first panel (21) and the corresponding second panel (22) are arranged at an angle; When the sofa bed is in the flat bed mode, all the first panels (21) of the first panel group and all the second panels (22) of the second panel group are arranged on the same plane; When the sofa bed is in the folding bed form, the first plate (21) and the corresponding second plate (22) are arranged on the same plane, and the first plate (21) fixedly connected to the support platform base (10) in the first plate group is arranged at an angle to the other adjacent first plate (21).

2. The sofa bed according to claim 1, characterized in that, The plurality of first plates (21) are sequentially arranged along the longitudinal direction of the support platform base (10) as first foot plate (211), first leg plate (212), first hip plate (213), and first back plate (214), and the plurality of second plates (22) are sequentially arranged along the longitudinal direction of the support platform base (10) as second foot plate (221), second leg plate (222), second hip plate (223), and second back plate (224). The first buttock plate (213) is fixedly connected to the support platform base (10); When the sofa bed is in the folding bed mode, the first leg plate (212) and the first back plate (214) are respectively inclined to the first hip plate (213), and the second leg plate (222) and the second back plate (224) are respectively inclined to the second hip plate (223).

3. The sofa bed according to claim 2, characterized in that, When the sofa bed is in folding bed mode, the first footboard (211) and the first legboard (212) are arranged at an angle, and the angle between the first footboard (211) and the first hipboard (213) is greater than the angle between the first legboard (212) and the first hipboard (213). The second foot plate (221) and the second leg plate (222) are arranged at an angle, and the angle between the second foot plate (221) and the second hip plate (223) is greater than the angle between the second leg plate (222) and the second hip plate (223).

4. The sofa bed according to claim 2, characterized in that, The support platform base (10) includes a first frame (11) and a second frame (12) arranged longitudinally at intervals, and a connector (13) detachably connected to the first frame (11) and the second frame (12). The first hip plate (213) includes a first front hip plate (2131) fixedly connected to the first frame (11) and a first rear hip plate (2132) fixedly connected to the second frame (12).

5. The sofa bed according to claim 4, characterized in that, The second buttock plate (223) includes a second front buttock plate (2231) arranged corresponding to the first front buttock plate (2131) and a second rear buttock plate (2232) corresponding to the first rear buttock plate (2132).

6. The sofa bed according to claim 1, characterized in that, The rotation center of the first hinge (31) is located on the side of the first plate (21) facing the support platform base (10); and / or, The rotation center of the second hinge (32) is located on the side of the second plate (22) facing the support platform seat (10).

7. The sofa bed according to claim 6, characterized in that, The plurality of first plates (21) are sequentially arranged along the longitudinal direction of the support platform base (10) as first foot plate (211), first leg plate (212), first hip plate (213), and first back plate (214), and the plurality of second plates (22) are sequentially arranged along the longitudinal direction of the support platform base (10) as second foot plate (221), second leg plate (222), second hip plate (223), and second back plate (224). The first buttock plate (213) is fixedly connected to the support platform base (10); The plurality of the first hinges (31) are respectively: a first low pivot hinge connecting the first foot plate (211) and the first leg plate (212), a first leg plate (212) connecting the first leg plate (212) and the first hip plate (213), and a first plate hinge connecting the first hip plate (213) and the first back plate (214); The plurality of second hinges (32) serve as: a second low pivot hinge connecting the second foot plate (221) and the second leg plate (222), a second leg plate (222) connecting the second leg plate (222) and the second hip plate (223), and a second plate hinge connecting the second hip plate (223) and the second back plate (224).

8. The sofa bed according to claim 1, characterized in that, The rotation center of the third hinge (33) is located on the side of the first plate (21) or the second plate (22) away from the support platform seat (10).

9. The sofa bed according to claim 8, characterized in that, The third hinge (33) includes a pivot portion and two rotating portions rotatably connected to the pivot portion. Each rotating portion includes an extension extending radially from the pivot portion and a bent portion extending obliquely from the extension portion. The bent portion is used to connect the side of the first plate (21) facing the support platform base (10) or the side of the second plate (22) facing the support platform base (10); and / or, The sofa bed also includes a mattress (50) laid on the board assembly (20), the mattress (50) having a relief groove (501) extending longitudinally along the support platform seat (10), and the third hinge (33) inserted into the relief groove (501).

10. The sofa bed according to claim 1, characterized in that, The sofa bed also includes a mattress (50) laid on the panel assembly (20), the mattress (50) including a zipper assembly surrounding the edge of the panel assembly (20) and a bed body detachably connected to the zipper assembly.

11. The sofa bed according to any one of claims 1 to 10, characterized in that, The sofa bed also includes a first drive assembly (60) and a second drive assembly (70); The first drive assembly (60) drives the first plate (21) that is movable relative to the support platform base (10) in the first plate group and the second plate (22) that is corresponding to the movable first plate (21) to enable the sofa bed to switch between the flat bed mode and the folding bed mode; The second drive assembly (70) drives the second plate (22) connected to the second plate group to switch the sofa bed between the flat bed mode and the sofa mode.

12. The sofa bed according to claim 11, characterized in that, The plurality of first plates (21) are sequentially arranged along the longitudinal direction of the support platform base (10) as first foot plate (211), first leg plate (212), first hip plate (213), and first back plate (214), and the plurality of second plates (22) are sequentially arranged along the longitudinal direction of the support platform base (10) as second foot plate (221), second leg plate (222), second hip plate (223), and second back plate (224). The first buttock plate (213) is fixedly connected to the support platform base (10); The first drive assembly (60) includes a front drive mechanism (61) and a rear drive mechanism (62). The front drive mechanism (61) drives the connection between the first back plate (214) and the second back plate (224), and the rear drive mechanism (62) drives the connection between the first foot plate (211), the first leg plate (212), the second foot plate (221), and the second leg plate (222).

13. The sofa bed according to claim 12, characterized in that, The front drive mechanism (61) includes a front drive frame (611) rotatably mounted on the support platform base (10) and a front drive motor (612) connected to the front drive frame (611), the front drive frame (611) having a first pivot extending laterally along the support platform base (10); When the sofa bed is in folding bed mode, the first back panel (214) and the second back panel (224) abut against the front drive frame (611).

14. The sofa bed according to claim 13, characterized in that, The front drive frame (611) includes a front frame body (6111) mounted on the support platform base (10), a first roller (6112) mounted on the front frame body (6111) and used to abut against the first back plate (214), and a second roller (6113) mounted on the front frame body (6111) and used to abut against the second back plate (224).

15. The sofa bed according to claim 12, characterized in that, The rear drive mechanism (62) includes a rear drive frame (621) rotatably connected to the support platform base (10) and a rear drive motor (622) connected to the rear drive frame (621). The rear drive frame (621) has a second pivot extending laterally along the support platform base (10). When the sofa bed is in folding bed mode, the first leg plate (212) and the second leg plate (222) abut against the rear drive frame (621).

16. The sofa bed according to claim 15, characterized in that, The first leg plate (212) is fixedly connected to the rear drive frame (621); and / or, The rear drive mechanism (62) further includes a first auxiliary support (623) rotatably mounted on the support platform seat (10), the auxiliary support having a third pivot extending laterally along the support platform seat (10), and the end of the first auxiliary support (623) away from the third pivot being rotatably connected to the first foot plate (211).

17. The sofa bed according to claim 12, characterized in that, The second drive assembly (70) includes a balance frame (72) fixedly connected to the second hip plate (223) and extending longitudinally along the support platform seat (10), and a drive mechanism (71) connected to the balance frame (72). When the sofa bed is in sofa mode, the second footboard (221), the second legboard (222), the second hipboard (223) and the second backboard (224) abut against the balance frame (72).

18. The sofa bed according to claim 17, characterized in that, The second drive assembly (70) further includes a second auxiliary support (73) that is rotatably connected at both ends to the second foot plate (221) and the balance frame (72). When the sofa bed is in folding bed mode or flat bed mode, the second auxiliary support (73) has a third pivot extending laterally along the support platform seat (10) and close to the balance frame (72).

19. The sofa bed according to claim 18, characterized in that, The central drive mechanism (71) includes a central drive frame (711) rotatably mounted on the support platform base (10) and a central drive motor (712) connected to the central drive frame (711). The central drive frame (711) has a fourth rotating shaft extending longitudinally along the support platform base (10). When the sofa bed is in sofa mode, the second hip plate (223) abuts against the central drive frame (711).

20. The sofa bed according to claim 19, characterized in that, The central drive frame (711) includes a central frame body (7111) mounted on the support platform base (10) and a third roller (7112) mounted on the central frame body (7111). When the sofa bed is in sofa mode, the second hip board (223) abuts against the third roller (7112).

21. The sofa bed according to claim 20, characterized in that, The central drive frame (711) also includes at least one fourth roller (7113) mounted on the central frame body (7111), the fourth roller (7113) and the third roller (7112) being arranged longitudinally at intervals along the support platform seat (10); When the sofa bed is in sofa mode, at least one second plate (22) in the second plate group abuts against the fourth roller (7113).

22. The sofa bed according to any one of claims 1 to 10, characterized in that, The sofa bed also includes a pad assembly (40) installed on the side of the board assembly (20) facing the support platform seat (10). When the sofa bed is in the flat bed position, the pad assembly (40) abuts against the support platform seat (10) on the side opposite to the board assembly (20).

23. A method for switching the form of a sofa bed, characterized in that, An application to a sofa bed as described in any one of claims 1 to 22 includes the following steps: S1 receives the mode switching command; S2 detects the current state of the sofa bed; S3 determines whether the current sofa bed is in a flat bed configuration; If S4 is correct, the sofa bed's form will be changed according to the form switching command; otherwise, the current sofa bed's form will be changed to a flat bed form, and the process will return to S2.

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