Foldable sofa bed

Abstract

This application provides a foldable sofa bed, including a main frame and a cushion assembly. The main frame includes a front end and a rear end. The cushion assembly includes a seat cushion, a middle mattress, and a rear mattress arranged longitudinally. One side of the rear mattress is rotatably connected to the rear end of the main frame, and one side of the middle mattress is rotatably connected to the front end of the main frame, with the other end rotatably connected to the seat cushion. The cushion assembly is movably connected to the main frame, allowing the sofa bed to switch between a sofa state and a bed state. When the seat cushion is folded over the middle mattress and the rear mattress is folded to fit against the main frame, the sofa bed is in the sofa state. When the middle mattress is flipped out from within the main frame, the seat cushion flips relative to the middle mattress, and the rear mattress flips relative to the main frame, so that the rear mattress, middle mattress, and seat cushion form a continuous plane, the sofa bed is in the bed state.

Description

Technical Field

[0001] This application relates to the field of furniture technology, specifically to a foldable sofa bed. Background Technology

[0002] A sofa bed is a type of furniture that combines the functions of a sofa and a bed, and it is widely used in daily life. Compared to other furniture (such as a single chair), a sofa bed allows more people to sit or lie down comfortably side by side. A typical sofa bed consists of a frame structure and a mattress. The mattress can be unfolded, allowing the sofa bed to be transformed into various modes, such as a sitting sofa or a reclining bed. Pillows and cushions can also be added.

[0003] Sofa beds typically use a sliding system to convert between sofa and bed functions. These sofa beds usually have three movable seat bases, allowing switching between bed and sofa modes. However, the connection structure between the various components of this type of sofa bed is complex, takes up a lot of space, parts are easily damaged, and it's inconvenient for users to switch or store them easily, thus lacking flexibility in daily use. Summary of the Invention

[0004] This application provides a foldable sofa bed to solve the technical problem of complex connection structures between various components of a sofa bed. This application aims to provide a novel sofa bed that is versatile, flexible, lightweight, space-saving, simple in structure, easy to assemble, and convenient to use, further enhancing the user experience.

[0005] This application provides a foldable sofa bed, including a main frame and a cushion assembly. The main frame includes a front end and a rear end arranged opposite each other along the longitudinal direction. The cushion assembly includes a seat cushion, a middle mattress, and a rear mattress that can be arranged sequentially along the longitudinal direction. One side of the rear mattress is rotatably connected to the rear end of the main frame, one side of the middle mattress is rotatably connected to the front end of the main frame, and the other end is rotatably connected to the seat cushion. The cushion assembly is movably connected to the main frame, allowing the sofa bed to switch between a sofa state and a bed state. When the seat cushion is folded above the middle mattress and the rear mattress is folded to fit against the main frame, the sofa bed is in the sofa state. When the middle mattress is flipped out from the main frame, the seat cushion flips relative to the middle mattress, and the rear mattress flips relative to the main frame, so that the rear mattress, the middle mattress, and the seat cushion form a continuous plane, the sofa bed is in the bed state.

[0006] Optionally, the back of the cushion is rotatably provided with a first support foot, which is located on the side of the cushion away from the middle section of the mattress.

[0007] Optionally, the first support foot is U-shaped and includes a first horizontal bar and two parallel first vertical bars. The two ends of the first horizontal bar are respectively fixed to the tail ends of the two first vertical bars, and the top end of the first vertical bar is rotatably connected to the back of the cushion, so that the first support foot can fit against the cushion or form an angle with the cushion.

[0008] Optionally, the back of the cushion is rotatably provided with a second support foot, which is located on the side of the cushion near the middle section of the mattress.

[0009] Optionally, the second support foot is U-shaped and includes a second horizontal bar and two parallel second vertical bars. The two ends of the second horizontal bar are respectively fixed to the tail ends of the two second vertical bars, and the top ends of the second vertical bars are rotatably connected to the back of the cushion, so that the second support foot can fit against the cushion or form an angle with the cushion.

[0010] Optionally, a balance bar is provided between the seat cushion and the middle section mattress, one end of which is rotatably connected to the middle area of ​​the second support foot, and the other end is rotatably connected to the back of the middle section mattress.

[0011] Optionally, the first support leg and the second support leg are arranged parallel to each other, and a connecting rod is provided between the first support leg and the second support leg; the two ends of the connecting rod are respectively rotatably hinged to the first support leg and the second support leg.

[0012] Optionally, the back of the middle section mattress is rotatably connected to the main frame via a pivot; one or more elastic elements are fitted on the pivot, and the elastic elements are compressed when the seat cushion is folded over the middle section mattress.

[0013] Optionally, a support plate is provided longitudinally within the main frame, and the pivot passes through the support plate; when there are two or more middle mattresses, the support plate is located between two adjacent middle mattresses.

[0014] Optionally, the number of the seat cushion, the middle mattress, and the rear mattress is the same; the number of the seat cushion is two or more, and the multiple seat cushions are arranged sequentially in the horizontal direction, which is perpendicular to the vertical direction; the number of the middle mattress is two or more, and the multiple middle mattresses are arranged sequentially in the horizontal direction; the number of the rear mattress is two or more, and the multiple rear mattresses are arranged sequentially in the horizontal direction.

[0015] Optionally, the back of the middle section mattress is rotatably provided with a third support leg, which is located on the side of the middle section mattress away from the seat cushion.

[0016] Optionally, the main frame includes a support base, a backrest, and two armrests. The two armrests are located at both ends of the support base in the lateral direction, and the backrest is located at the rear end of the support base. The middle section of the mattress is rotatably connected to the front end of the support base. The rear section of the mattress is rotatably connected to the rear end of the support base or the backrest.

[0017] Optionally, the support base has a first receiving space, and the middle section of the mattress can be folded into the first receiving space.

[0018] Optionally, the backrest has a second receiving space recessed on the side facing the support seat, and the rear section of the mattress can be folded into the second receiving space.

[0019] Optionally, the sofa bed may also include backrests.

[0020] This application provides a foldable sofa bed that utilizes a movable connection between the cushion assembly and the main frame to switch between sofa and bed states. Since the middle mattress is rotatably connected to the main frame and seat cushion on both sides, the states can be quickly switched by controlling the state and position of the middle mattress relative to the main frame. Furthermore, the independently rotatable rear mattress further reduces the difficulty of folding and unfolding the sofa bed, making it more convenient for consumers. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying 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.

[0022] Figure 1 This is a schematic diagram of the sofa bed provided in this application in sofa mode; Figure 2 This is a schematic diagram illustrating the process of the sofa bed switching to the bed form provided in this application; Figure 3 This is a schematic diagram of the sofa bed provided in this application in its bed-like state; Figure 4 This is a partial structural diagram of the seat cushion and the middle section mattress when the sofa bed provided in this application is in the bed form. Figure 5 This is a side view of the sofa bed provided in this application in its bed-like configuration; Figure 6 This is a structural diagram of the seat cushion and the middle mattress when the sofa bed provided in this application is switched to the bed position; Figure 7 This is a schematic diagram illustrating the unfolding process of the seat cushion and the middle mattress when the sofa bed provided in this application is switched to the bed position. Figure 1 ; Figure 8 This is a schematic diagram illustrating the unfolding process of the seat cushion and the middle mattress when the sofa bed provided in this application changes its bed position. Figure 2 ; Figure 9 This is a schematic diagram showing the unfolded first and second support legs of the sofa bed provided in this application when it is in the bed position; Figure 10 This is a side view of the sofa bed provided in this application in its sofa position; Figure 11 This is a schematic diagram of the hinge structure of the sofa bed provided in this application. Figure 1 ; Figure 12 This is a schematic diagram of the hinge structure of the sofa bed provided in this application. Figure 2 .

[0023] Explanation of reference numerals in the attached figures: 1. Seat cushion; 2. Mid-section mattress; 3. Backrest mattress; 4. Armrest; 5. Backrest; 6. Backrest pillow; 7. First support leg; 8. First connector; 9. Connecting rod; 10. Second connector; 11. Second support leg; 12. Balance bar; 13. First part of folding hinge; 14. Second part of folding hinge; 15. First fixing component; 16. Spindle; 17. Third support leg; 18. Washer ring; 19. Elastic component; 20. Second fixing component; 21. Rotating hinge; 22. Support plate; 23. Support base. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "up," "down," "left," and "right" generally refer to up, down, left, and right in the actual use or working state of the device, specifically the drawing directions in the accompanying drawings.

[0025] This application provides a foldable sofa bed, which will be described in detail below. It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of the embodiments of this application. Furthermore, the descriptions of each embodiment have their own emphasis; parts not described in detail in a certain embodiment can be referred to in the relevant descriptions of other embodiments.

[0026] Please see Figure 1 This application provides a foldable sofa bed that can be switched into various modes. It can be used as a sitting sofa, a reclining bed, and can also be equipped with pillows, cushions, etc.

[0027] Please see Figure 1 and Figure 2 The foldable sofa bed includes a main frame and a cushion assembly, which is movably connected to the main frame, allowing the sofa bed to be converted between a sofa state and a bed state. The main frame includes a support base 23, a backrest 5, and two armrests 4. The support base 23 is the basic support structure of the sofa bed, and it includes a front end and a rear end arranged longitudinally opposite each other. The front end of the support base 23 is the front end of the main frame, and the rear end of the support base 23 is the rear end of the main frame.

[0028] The two armrests 4 are respectively arranged horizontally at both ends of the support base 23, which is perpendicular to the longitudinal direction. In this embodiment, the horizontal direction is the length direction of the main frame, and the longitudinal direction is the width direction of the main frame. At the same time, the backrest 5 is fixed to the rear end of the support base 23 at an angle, so that when the consumer uses the sofa bed, the back of the human body can be pressed against the backrest 5.

[0029] Please see Figures 2-6 The cushion assembly includes a seat cushion 1, a middle mattress, and a rear mattress 3 arranged longitudinally. The rear side of the rear mattress 3 is rotatably hinged to the rear end of the main frame via a rotating hinge 21, allowing the rear mattress 3 to rotate relative to the main frame. In this application, the rear mattress 3 can be hinged to the rear end of the support seat 23 or to the backrest 5. When the sofa bed is in sofa mode, the rear mattress 3 is folded to fit against the backrest 5; when the sofa bed is in bed mode, the rear mattress 3 is flipped to fit against the support seat 23.

[0030] Please see Figure 2 The backrest 5 is recessed on the side facing the support seat 23, providing a second accommodating space. When the sofa bed is in sofa mode, the rear mattress 3 can be folded into the interior of the second accommodating space, making the structure of the sofa bed more compact.

[0031] Please see Figures 2-6One side of the middle section mattress 2 is rotatably connected to the front end of the main frame, and the other end is rotatably connected to the seat cushion 1, allowing the middle section mattress 2 to be folded relative to the rear section mattress 3 and the seat cushion 1. In this application, the rear side of the middle section mattress 2 is rotatably connected to the rear section mattress 3 via a pivot 16, while the front side of the middle section mattress 2 is hinged to the seat cushion 1 via a folding hinge. The first part 13 of the folding hinge is fixed to the back of the seat cushion 1 by fastening screws, and the second part 14 of the folding hinge is fixed to the back of the middle section mattress 2 by fastening screws, allowing the back of the middle section mattress 2 and the back of the seat cushion 1 to be folded into a close-fitting state.

[0032] Please see Figure 1 and Figure 2 When the sofa bed is in sofa mode, the rear mattress 3 is folded to fit the backrest 5 at an angle, and the back of the seat cushion 1 is relative to the back of the middle mattress 2, so that the seat cushion 1 can be folded above the middle mattress 2. At the same time, the middle mattress 2 can be rotated relative to the support seat 23, so that the middle mattress 2 and the seat cushion 1 can be folded above the support seat 23.

[0033] Please see Figure 1 and Figure 2 The support base 23 is recessed upwards to provide a first accommodating space. When the sofa bed is in sofa mode, the middle section mattress 2 can be folded into the first accommodating space. This not only limits the displacement of the middle section mattress 2 by utilizing the first accommodating space and improves the stability of the sofa bed structure after folding, but also enables the sofa bed to achieve a lightweight and compact design, improving comfort during use.

[0034] Please see Figure 2 and Figure 3 When the sofa bed is in its bed position, the middle mattress 2 rotates relative to the main frame and is flipped out from within the main frame, causing the middle mattress 2 and seat cushion 1 to be flipped to the outside of the main frame. Then, the seat cushion 1 is rotated relative to the middle mattress 2, so that the front of the middle mattress 2 and the front of the mattress form a continuous plane. At the same time, the rear mattress 3 is flipped to separate it from the backrest 5, so that the rear mattress 3 is folded to fit the support seat 23, thereby making the rear mattress 3, the middle mattress 2, and the seat cushion 1 form a continuous plane along the longitudinal direction.

[0035] Please see Figures 4-8The back of the seat cushion 1 is rotatably equipped with a first support leg 7, which is located on the side of the seat cushion 1 facing away from the middle mattress 2. When the sofa bed is in sofa mode, the seat cushion 1 is folded over the middle mattress 2, so that the back of the seat cushion 1 is flush with the back of the middle mattress 2. At this time, the first support leg 7 is folded and stored between the seat cushion 1 and the middle mattress 2. When the sofa bed is in bed mode, the first support leg 7 is rotated at an angle relative to the seat cushion 1 (the rotation angle is 90° in this application), so that the first support leg 7 can apply an upward force to the seat cushion 1, so that the seat cushion 1 and the middle mattress 2 can form a continuous plane.

[0036] Please see Figures 4-9 The first support leg 7 is U-shaped and includes a first horizontal bar and two parallel first vertical bars. The two ends of the first horizontal bar are fixed to the ends of the two first vertical bars, and the tops of the two first vertical bars are rotatably connected to the back of the seat cushion 1 via a first connector 8. In this application, the first connector 8 and the first vertical bars are rotatably connected, while the first connector 8 and the seat cushion 1 are fixedly connected. When the sofa bed is in its bed position, the first support leg 7 rotates at an angle relative to the seat cushion 1, allowing the first horizontal bar to contact the ground, thus increasing the stability of the force applied by the first support leg 7.

[0037] Please see Figures 4-9 The back of the seat cushion 1 is rotatably equipped with a second support leg 11, which is located on the side of the seat cushion 1 near the middle mattress 2. When the sofa bed is in sofa mode, the seat cushion 1 is folded over the middle mattress 2, so that the back of the seat cushion 1 is flush with the back of the middle mattress 2. At this time, the second support leg 11 is folded and stored between the seat cushion 1 and the middle mattress 2. When the sofa bed is in bed mode, the second support leg 11 is rotated at an angle relative to the seat cushion 1 (the rotation angle is 90° in this application), so that the second support leg 11 can apply an upward force to the hinge joint of the seat cushion 1 and the middle mattress 2, thereby maintaining the stability of the connection between the seat cushion 1 and the middle mattress 2.

[0038] Please see Figures 4-9 The second support leg 11 is U-shaped and includes a second horizontal bar and two parallel vertical bars. The two ends of the second horizontal bar are fixed to the ends of the two vertical bars, and the tops of the two vertical bars are rotatably connected to the back of the seat cushion 1 via a second connector 10. In this application, the second connector 10 and the second vertical bars are rotatably connected, while the second connector 10 and the seat cushion 1 are fixedly connected. When the sofa bed is in its bed position, the second support leg 11 rotates at an angle relative to the seat cushion 1, allowing the second horizontal bar to contact the ground, thus increasing the stability of the force applied by the second support leg 11.

[0039] Please see Figures 4-8 The first support leg 7 and the second support leg 11 are arranged in parallel, and a connecting rod 9 is provided between the first support leg 7 and the second support leg 11. In this application, the two first vertical bars and the two second vertical bars are respectively arranged opposite to each other, and a connecting rod 9 is provided between the corresponding first vertical bars and the second vertical bars.

[0040] Please see Figures 4-8 The two ends of the connecting rod 9 are rotatably hinged to the first support leg 7 and the second support leg 11, respectively, so that the connecting rod 9 can increase the stability of the first support leg 7 and the second support leg 11 while avoiding interference with the rotation of the first support leg 7 and the second support leg 11. In this application, the two ends of the connecting rod 9 are respectively hinged to the top of the first vertical rod and the top of the second vertical rod.

[0041] In this application, the length of the first vertical rod is less than half the longitudinal length of the cushion 1, and the length of the second vertical rod is also less than half the longitudinal length of the cushion 1. When the first vertical rod is folded to the back of the cushion 1, it rotates towards the side of the middle section of the mattress 2. When the second vertical rod is folded to the back of the cushion 1, it rotates away from the side of the middle section of the mattress 2. Since the lengths of both the first and second vertical rods are less than half the longitudinal length of the cushion 1, the folded first support leg 7 and the second support leg 11 will not interfere with each other.

[0042] Please see Figures 4-8 A balance bar 12 is provided between the seat cushion 1 and the middle section mattress 2. One end of the balance bar 12 is rotatably connected to the middle area of ​​the second support leg 11, and the other end of the balance bar 12 is rotatably connected to the back of the middle section mattress 2 via a second fastener 20. In this application, the second fastener 20 includes a hooking space, so that the end of the balance bar 12 can hook onto the second fastener 20.

[0043] A balance bar 12, positioned between the seat cushion 1 and the middle mattress 2, links the rotation of the seat cushion 1 with the rotation of the second support leg 11. When the sofa bed is switched to sofa mode, the seat cushion 1 is gradually folded relative to the middle mattress 2. At this time, the balance bar 12 can gradually rotate around its hinge point with the middle mattress 2, allowing the balance bar 12 to drive the second support leg 11 to gradually fold between the seat cushion 1 and the middle mattress 2. When the sofa bed is switched to bed mode, the seat cushion 1 is gradually unfolded relative to the middle mattress 2. At this time, the balance bar 12 can gradually rotate around its hinge point with the middle mattress 2, allowing the balance bar 12 to drive the second support leg 11 to gradually rotate to a supporting position.

[0044] Please see Figure 4The back of the middle section mattress 2 is rotatably equipped with a third support leg 17. The third support leg 17 is located on the side of the middle section mattress 2 away from the seat cushion 1, and is used to support one side of the middle section mattress 2. In this application, the third support leg 17 can rotate relative to the middle section mattress 2 at an angle, the angle range being 0-90°.

[0045] Please see Figures 6-12 The middle section mattress 2 is rotatably connected to the front end of the support seat 23. In this application, the back of the middle section mattress 2 is rotatably connected to the support seat 23 via a pivot 16. The pivot 16 passes laterally through one side end of the middle section mattress 2 and the front end of the support seat 23, so that the middle section mattress 2 and the support seat 23 can rotate coaxially to adjust the state and position of the middle section mattress 2 relative to the support seat 23.

[0046] Please see Figures 6-12 One or more elastic elements 19 are fitted onto the pivot 16. These elastic elements 19 are located between the middle mattress 2 and the support seat 23. When the seat cushion 1 is folded above the middle mattress 2 and the middle mattress 2 is folded into the main frame, the elastic elements 19 are compressed. When the sofa bed is switched from sofa mode to bed mode, the compressed elastic elements 19 can convert their elastic force into a thrust that rotates the middle mattress 2, assisting in its unfolding. In this application, the elastic element 19 is preferably a torsion spring. One or more washers 18 are fitted onto the outside of the pivot 16, which allows for smoother rotation of the pivot 16.

[0047] Please see Figure 11 and Figure 12 The main frame has a longitudinal support plate 22, and a specific support seat 23 is located in the first accommodating space with one or more support plates 22. The aforementioned pivot 16 can pass through the support plate 22 laterally, so the support plate 22 can be used to apply a supporting force to the pivot 16. At the same time, the position of the support plate 22 on the pivot 16 can be used to maintain the stability of the middle section mattress 2 when folded and unfolded relative to the main frame.

[0048] Please see Figure 1 and Figure 2 The number of seat cushion 1, middle section mattress 2 and rear section mattress 3 are the same. When there are two or more seat cushions 1, multiple seat cushions 1 can be arranged in the horizontal direction. When there are two or more middle section mattresses 2, multiple middle section mattresses 2 can be arranged in the horizontal direction. When there are two or more rear section mattresses 3, multiple rear section mattresses 3 can be arranged in the horizontal direction.

[0049] Please see Figure 1 and Figure 2When there are two or more middle mattresses 2, the aforementioned support plate 22 is located between two adjacent middle mattresses 2. When the middle mattresses 2 are folded into the first receiving space of the support seat 23, the support plate 22 can isolate the two adjacent middle mattresses 2, so that the middle mattresses 2 and the seat cushion 1 arranged in a single row along the longitudinal direction can be folded or unfolded individually, thereby increasing the flexibility of use. At the same time, the modular design can also make it more convenient for consumers to use.

[0050] Please see Figure 1 and Figure 2 The sofa bed can also be equipped with additional items such as backrests and pillows. These additional items can be directly placed on the sofa bed to improve the comfort of consumers.

[0051] Please see Figures 1-12 The sofa bed can switch between sofa and bed modes by utilizing the movable connection between the mattress assembly and the main frame. Since the middle mattress 2 is rotatably connected to the main frame and the seat cushion 1 on both sides, the state can be quickly switched by controlling the state and position of the middle mattress 2 relative to the main frame. At the same time, the rear mattress 3, which is rotatably set, can further reduce the difficulty of folding and unfolding the sofa bed, making it more convenient for consumers to use.

[0052] The above provides a detailed description of a foldable sofa bed provided by this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A foldable sofa bed, characterized in that, include: The main frame includes a front end and a rear end that are arranged opposite to each other along the longitudinal direction; The cushion assembly includes a seat cushion, a middle mattress, and a rear mattress that can be arranged longitudinally in sequence. One side of the rear mattress is rotatably connected to the rear end of the main frame, one side of the middle mattress is rotatably connected to the front end of the main frame, and the other end is rotatably connected to the seat cushion. The cushion assembly is movably connected to the main frame, allowing the sofa bed to switch between sofa mode and bed mode. When the seat cushion is folded above the middle section of the mattress and the rear section of the mattress is folded to fit against the main frame, the sofa bed is in the sofa state; when the middle section of the mattress is flipped out from the main frame, the seat cushion flips relative to the middle section of the mattress, and the rear section of the mattress flips relative to the main frame, so that the rear section of the mattress, the middle section of the mattress, and the seat cushion form a continuous plane, the sofa bed is in the bed state.

2. The foldable sofa bed according to claim 1, characterized in that, The back of the cushion is rotatably provided with a first support foot, which is located on the side of the cushion away from the middle section of the mattress.

3. The foldable sofa bed according to claim 2, characterized in that, The first support foot is U-shaped and includes a first horizontal bar and two parallel first vertical bars. The two ends of the first horizontal bar are respectively fixed to the tail ends of the two first vertical bars. The top end of the first vertical bar is rotatably connected to the back of the cushion, so that the first support foot can fit against the cushion or form an angle with the cushion.

4. The foldable sofa bed according to claim 2, characterized in that, The back of the cushion is rotatably provided with a second support foot, which is located on the side of the cushion near the middle section of the mattress.

5. The foldable sofa bed according to claim 4, characterized in that, The second support foot is U-shaped and includes a second horizontal bar and two parallel second vertical bars. The two ends of the second horizontal bar are respectively fixed to the tail ends of the two second vertical bars. The top end of the second vertical bar is rotatably connected to the back of the cushion, so that the second support foot can fit against the cushion or form an angle with the cushion.

6. The foldable sofa bed according to claim 4, characterized in that, A balance bar is provided between the seat cushion and the middle section of the mattress. One end of the balance bar is rotatably connected to the middle area of ​​the second support foot, and the other end is rotatably connected to the back of the middle section of the mattress.

7. The foldable sofa bed according to claim 4, characterized in that, The first support leg and the second support leg are arranged parallel to each other, and a connecting rod is provided between the first support leg and the second support leg; The two ends of the connecting rod are rotatably hinged to the first support leg and the second support leg, respectively.

8. The foldable sofa bed according to claim 1, characterized in that, The back of the middle section of the mattress is rotatably connected to the main frame via a pivot. One or more elastic elements are sleeved on the pivot. When the seat cushion is folded above the middle section of the mattress, the elastic elements are in a compressed state.

9. The foldable sofa bed according to claim 8, characterized in that, A support plate is provided longitudinally within the main frame, and the rotating shaft passes through the support plate. When there are two or more mid-section mattresses, the support plate is located between two adjacent mid-section mattresses.

10. The foldable sofa bed according to claim 1, characterized in that, The number of the seat cushion, the middle section mattress, and the rear section mattress are the same; The number of cushions is two or more, and the multiple cushions are arranged sequentially in a horizontal direction, which is perpendicular to the vertical direction. The number of mid-section mattresses is two or more, and the multiple mid-section mattresses are arranged sequentially in a horizontal direction; The number of rear mattresses is two or more, and the multiple rear mattresses are arranged sequentially in the horizontal direction.

11. The foldable sofa bed according to claim 1, characterized in that, The back of the middle section mattress is rotatably equipped with a third support leg, which is located on the side of the middle section mattress away from the seat cushion.

12. The foldable sofa bed according to claim 1, characterized in that, The main frame includes a support base, a backrest, and two armrests. The two armrests are located at both ends of the support base in the horizontal direction, and the backrest is located at the rear end of the support base. The middle section of the mattress is rotatably connected to the front end of the support base; The rear section of the mattress is rotatably connected to the rear end of the support seat or the backrest.

13. The foldable sofa bed according to claim 12, characterized in that, The support base has a first accommodating space, and the middle section of the mattress can be folded into the first accommodating space.

14. The foldable sofa bed according to claim 12, characterized in that, The backrest is recessed on the side facing the support seat, providing a second receiving space, and the rear section of the mattress can be folded into the second receiving space.

15. The foldable sofa bed according to claim 1, characterized in that, The sofa bed also includes backrests.

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