A sofa bed

Abstract

This utility model relates to a sofa bed, including a backrest frame, a seat frame, and a base frame. The lower end of the backrest frame is hinged to the rear end of the seat frame. The sofa bed also includes a support rod, the upper end of which is hinged to the backrest frame, and the lower end of which is hinged to the rear of the base frame. The seat frame can slide back and forth relative to the base frame. The base frame is provided with a driving component, the mounting end of which is hinged to the base frame, and its movable end is hinged to the support rod. When the movable end of the driving component pushes the support rod, the upper end of the support rod rotates upward, thereby causing the backrest frame to stand upright, and the sofa bed is in a sofa state. When the movable end of the driving component pulls back the support rod, the upper end of the support rod rotates downward, thereby pushing the backrest frame and seat frame forward, the backrest frame flattens, and the sofa bed is in a bed state. This solution achieves a stable and reliable conversion between a sofa bed and a massage bed, ensuring smooth and stable forward and backward movement of the backrest frame, and solving the instability problem of traditional deformable structures.

Description

Technical Field

[0001] This utility model relates to the field of massage chair technology, and in particular to a sofa bed. Background Technology

[0002] With the continuous development of the economy and the gradual improvement of people's living standards, massage chairs, as smart home products, are increasingly appearing in modern life scenarios. Their design and functions are also becoming more advanced, evolving from the initial sitting function to the backrest function and then to the reclining function, providing a more comfortable and personalized massage experience.

[0003] A Chinese invention patent with publication number CN119792009A discloses a three-axis progressive linkage flattening zero-space massage chair frame with a sliding groove structure, including a base frame, a backrest frame, a seat frame, and a robotic arm. The backrest frame and the seat frame are mounted on the base frame. The backrest frame has backrest frame guide rails on both sides, and the seat frame has seat frame guide rails on both sides. A flexible guide rail connects the seat frame guide rail and the backrest frame guide rail. The robotic arm can move by engaging with the seat frame guide rail, a toothed chain, or the backrest frame guide rail through a walking wheel assembly. The first end of the backrest frame can lie down or stand up on the base frame. The flexible guide rail bends or stops bending as the backrest frame lies down or stands up. The base frame achieves a large-angle lying down or standing up by using a sliding groove structure to realize the progressive transmission of the backrest frame sliding shaft, the first seat frame sliding shaft, and the second seat frame sliding shaft.

[0004] The above technical solution has the following technical problems: ① The backrest and seat frame together achieve reclining through a structure of three sliding shafts and three sliding grooves. If there is a problem with one of the sliding structures, it will cause jamming or switching failure, resulting in poor stability and inconvenient operation during the conversion process.

[0005] ② The backrest and seat frame rotate relative to the base and move forward a small distance to achieve a reclining position. After reclining, most of the backrest is on the outside of the base frame. When a person lies down, the support effect on the upper body is limited, resulting in a poor user experience. Furthermore, it cannot achieve true "zero wall" placement and takes up a lot of space.

[0006] ③ In the lying position, the footrest does not unfold, making it impossible to achieve full extension to fit the human body. Summary of the Invention

[0007] To address the aforementioned issues, the present invention aims to provide a sofa bed that employs a simple and reasonable mechanical mechanism to allow the backrest frame to be moved forward, folded flat, and placed above the base frame, thereby enhancing support, enabling free switching between bed and sofa modes, and achieving zero-wall-adhesion functionality.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: A sofa bed includes a backrest frame, a seat frame, and a base frame, wherein the lower end of the backrest frame is hinged to the rear end of the seat frame, characterized in that: It also includes a support rod, the upper end of which is hinged to the backrest frame and the lower end of which is hinged to the rear of the base frame; the seat frame can slide back and forth relative to the base frame; the base frame is provided with a drive component, the mounting end of which is hinged to the base frame and the movable end of which is hinged to the support rod. When the movable end of the drive component pushes the support rod, the upper end of the support rod rotates upward, thereby causing the backrest frame to stand up, and the sofa bed is in the sofa state; When the movable end of the drive component pulls back the support rod, the upper end of the support rod rotates downward, thereby pushing the backrest frame and seat frame forward, flattening the backrest frame, and putting the sofa bed into bed mode.

[0009] Preferably, the lower back of the backrest frame is hinged with two support rods, and a mounting rod is connected between the two support rods. The movable end of the drive component is hinged to the mounting rod.

[0010] Preferably, the seat frame is slidably disposed within the base frame, with an opening on the front side of the base frame. When the sofa bed is switched to bed mode, the seat frame is pushed out of the base frame along the opening by the backrest frame.

[0011] Preferably, the lower two sides of the seat frame extend backward to form extension rods, and the bottom front and rear sides of the extension rods are provided with rollers.

[0012] Preferably, the base frame has guide rails on both sides inside, and the extension rod has a slide rail fixed on the outside that slides with the guide rails.

[0013] Preferably, when the sofa bed is in sofa mode, the hinge position of the backrest frame and the support rod is above the hinge position of the backrest frame and the seat frame; when the sofa bed is in bed mode, the hinge position of the backrest frame and the support rod is not higher than the hinge position of the backrest frame and the seat frame.

[0014] Preferably, the backrest frame has connecting seats on both sides of the back, and connecting seats have connecting grooves. A through hole is opened on the bottom surface of the connecting groove. The upper end of the support rod passes through the through hole and is hinged to the backrest frame. The upper and lower inner walls of the connecting groove form inclined surfaces that cooperate with the upper part of the support rod.

[0015] Preferably, the base frame has an internal rear mounting seat, the driving component is an electric cylinder, the mounting end of the electric cylinder is hinged to the mounting seat, the movable end of the electric cylinder is provided with a connecting sleeve, the lower end of the mounting rod is provided with two connecting plates, the connecting sleeve is hinged between the two connecting plates, and the electric cylinder can drive the connecting sleeve to move obliquely along the cylinder body to drive the mounting rod and support rod to rotate.

[0016] Preferably, the lower end of the backrest frame is hinged with a push rod, which is hinged to a swing rod on the seat frame. Both ends of the swing rod are connected to a footrest linkage assembly, which is mounted on the seat frame via a mounting plate. The front end of the footrest linkage assembly is hinged with a footrest plate. When the backrest frame tilts backward and moves forward, the push rod acts on the footrest linkage assembly through the swing rod to make the footrest plate flip upward and flatten.

[0017] The present invention adopts the above technical solution and has the following technical effects: ① The sofa bed is equipped with two support rods. The upper end of the support rod is hinged to the back of the backrest frame, and the lower end of the support rod is hinged to the base frame. When the moving end of the electric cylinder pushes the support rod, the upper end of the support rod rotates upward, thereby driving the backrest frame to stand up. The support rod tilts forward at a certain angle and supports the backrest frame, and the sofa bed is in the sofa state. The sofa bed's seat frame can slide back and forth relative to the base frame. The lower end of the backrest frame is hinged to the rear end of the seat frame. When the electric cylinder acts on the mounting rod, pulling the support rod inward towards the base frame, the upper end of the support rod pushes the backrest frame forward. During the forward movement of the backrest frame, the seat frame is pushed out, and the backrest frame is pushed flat, putting the sofa bed into a bed state. The seat frame is pushed out of the bed frame, extending the effective usable length in the bed state and improving the user experience. The entire process creates a folding effect of the backrest frame relative to the base frame. At the same time, when the backrest frame is pushed flat, it provides better support above the base frame, further enhancing the user experience. This solution achieves a stable and reliable transition between the sofa bed's "sofa state" and "bed state" through a simple and efficient linkage drive mechanism. The electric cylinder acts directly on the mounting rod connecting the two support rods, with a reasonable force transmission path and good synchronization of actions, ensuring a smooth and stable forward movement and unfolding of the backrest frame, solving the instability problem of traditional deformable structures.

[0018] ② The bottom of the seat frame is equipped with rollers, and the slide rails on both sides of the seat frame cooperate with the guide rails on the base frame, so that the seat frame slides smoothly and moves forward quickly and stably.

[0019] ③ The electric cylinder drives the support rod to tilt and move the backrest frame forward, so that the sofa bed can be placed close to the wall, which has a zero-wall function, effectively saving space and improving the user experience.

[0020] ④ The lower end of the backrest frame is hinged to the push rod, and the front end of the push rod is hinged to the footrest linkage assembly through the swing rod. In this way, there is no need for an independent drive device. When the backrest frame tilts back and moves forward, it automatically pushes the footrest up to flatten through the push rod, swing rod and footrest linkage assembly, realizing the "lower leg lifting" or "zero gravity" experience. It has a high degree of functional integration and a good user experience. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of a sofa bed in its sofa configuration.

[0022] Figure 2 This is a three-dimensional structural diagram of a sofa bed in its bed configuration.

[0023] Figure 3 This is a schematic diagram showing the position of the support rod between the backrest frame and the base frame when the sofa is in its sofa position.

[0024] Figure 4 This is a schematic diagram showing the position of the support rods between the backrest frame and the base frame when the bed is in its working state.

[0025] Figure 5 for Figure 3 A schematic diagram of the side structure.

[0026] Figure 6 for Figure 4 A schematic diagram of the side structure.

[0027] Figure 7 This is a schematic diagram showing the installation of the electric cylinder and mounting rod on the inner side of the base frame.

[0028] Figure 8 This is a schematic diagram showing the connection between the base frame and the support rod in the sofa configuration.

[0029] Figure 9 This is a schematic diagram of the three-dimensional structure of the seat frame in sofa mode.

[0030] Figure 10 This is a schematic diagram of the three-dimensional structure of the backrest.

[0031] Figure 11 This is a schematic diagram showing the connection between the support rod and the backrest frame and base frame.

[0032] Figure 12 This is a three-dimensional structural diagram of the connector.

[0033] Figure 13 This is a schematic diagram of the assembly of the electric cylinder and the connecting sleeve.

[0034] Figure 14 This is a three-dimensional structural diagram of the guide rails on the base frame.

[0035] Figure 15 This is a schematic diagram of the assembly of the mounting bracket on the slide rail.

[0036] Figure 16 This is a schematic diagram showing the fit between the base frame and the seat frame in the bed configuration.

[0037] Figure 17 This is a schematic diagram showing the connection between the base frame and the support rod in the bed configuration.

[0038] Figure 18 This is a schematic diagram showing the arrangement of the connecting plates on the mounting pole.

[0039] Figure 19 This is a schematic diagram showing the coordination of the push rod, swing rod, and footrest linkage assembly in the sofa position.

[0040] Figure 20 This is a schematic diagram showing the coordination of the push rod, swing rod, and footrest linkage assembly in the bed configuration. Detailed Implementation

[0041] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0042] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0043] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more, unless otherwise expressly defined.

[0044] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0045] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature 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 includes the first feature 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.

[0046] like Figures 1-20 The sofa bed shown includes a backrest frame 1, a seat frame 2, and a base frame 3. The lower end of the backrest frame 1 is hinged to the rear end of the seat frame 2. The sofa bed also includes a support rod 4, the upper end of which is hinged to the backrest frame 1, and the lower end of which is hinged to the rear of the base frame 3. The seat frame 2 can slide back and forth relative to the base frame 3. The base frame 3 is provided with a driving component, the mounting end of which is hinged to the base frame 3, and the movable end of which is hinged to the support rod 4. When the movable end of the drive component pushes the support rod 4, the upper end of the support rod 4 rotates upward, thereby causing the backrest frame 1 to stand up, and the sofa bed is in the sofa state. When the movable end of the drive component pulls back the support rod 4, the upper end of the support rod 4 rotates downward, thereby pushing the backrest frame 1 and the seat frame 2 forward, the backrest frame 1 is flattened, and the sofa bed is in the bed state.

[0047] In the above technical solution, two support rods are installed on the sofa bed. The upper end of the support rod is hinged to the back of the backrest frame, and the lower end of the support rod is hinged to the base frame. When the movable end of the drive component pushes the support rod, the upper end of the support rod rotates upward, thereby driving the backrest frame to stand up. The support rod tilts forward at a certain angle and supports itself on the backrest frame, and the sofa bed is in the sofa state. The sofa bed's seat frame can slide back and forth relative to the base frame. The lower end of the backrest frame is hinged to the rear end of the seat frame. When the drive unit acts on the mounting rod, it pulls the support rod inward toward the base frame. The upper end of the support rod pushes the backrest frame forward. As the backrest frame moves forward, it also pushes the seat frame forward, causing the backrest frame to be pushed flat, thus putting the sofa bed into bed mode. This solution achieves a stable and reliable transition between the sofa bed's "sofa mode" and "bed mode" through a simple and efficient linkage drive mechanism.

[0048] like Figure 7 and Figure 8As shown, two support rods 4 are hinged to the lower back side of the backrest frame 1, and a mounting rod 5 is connected between the two support rods 4. The movable end of the driving component is hinged to the mounting rod 5. In this technical solution, two support rods are hinged to the back side of the backrest frame, and a mounting rod is connected between the support rods. The mounting rod is hinged to the driving component, resulting in higher overall structural stability. In this way, the driving component directly acts on the mounting rod connecting the two support rods, resulting in a reasonable force transmission path and good synchronization of actions. This ensures that the backrest frame tilts backward and unfolds forward smoothly, solving the problem of instability in traditional deformable structures.

[0049] Furthermore, the seat frame 2 is slidably disposed within the base frame 3, with an opening on the front side of the base frame 3. When the sofa bed is switched to bed mode, the seat frame 2 is pushed out of the base frame 3 along the opening by the backrest frame 1. In this technical solution, as... Figure 9 and Figure 10 As shown, the backrest frame is hinged at points 104 on both sides of its lower end to points 103 on both sides of the seat frame. The two mounting plates 102 at the lower end of the backrest frame are hinged to the push rods inside the seat frame. This allows the backrest frame to completely push the seat frame out of the bed frame when it tilts back and moves forward, thus extending the effective usable length of the bed and improving the user experience. Furthermore, the drive mechanism causes the support rod to tilt, causing the backrest frame to tilt back and move forward, allowing the sofa bed to be placed flush against the wall, effectively saving space and enhancing the user experience.

[0050] like Figure 9 and Figure 16 As shown, the lower two sides of the seat frame 2 extend rearward to form extension rods 6, and rollers 7 are provided on the front and rear sides of the bottom of the extension rods 6. In this technical solution, by setting the extension rods with rollers, the friction of the seat frame during the sliding process is greatly reduced, making the switching action more effortless, smooth and quiet, while reducing mechanical wear and improving the durability and reliability of the product. In addition, the rollers play a supporting role, improving the stability of the seat frame.

[0051] like Figure 8 , Figure 9 and Figures 14-16As shown, guide rails 8 are provided on both sides of the inner side of the base frame 3, and a slide rail 9 is fixed on the outer side of the extension rod 6, which slides in cooperation with the guide rails 8. Multiple mounting seats 10 are installed on the slide rail 9, and the mounting seats 10 are adapted to be installed in the slide grooves 11 of the guide rails 8. The upper and lower sides of the mounting seats 10 are provided with balls 12 that cooperate with the upper and lower inner walls of the slide grooves 11, and the middle of the mounting seat 10 is provided with a pulley 13 that cooperates with the bottom surface of the slide grooves 11. In this technical solution, the cooperation between the guide rails and the slide rails provides precise guidance and limitation for the sliding of the frame, preventing it from deviating, jamming, or shaking during movement, ensuring the accuracy and structural stability of the form transformation process. Furthermore, the slide rails use a "ball + pulley" configuration on the mounting seats, achieving multi-dimensional rolling friction between the slide rails and the guide rails. This further reduces sliding resistance, ensures smooth sliding under load, avoids abnormal noise, and improves the product's texture, durability, and reliability.

[0052] Furthermore, such as Figure 5 As shown, when the sofa bed is in sofa mode, the hinge position between the backrest frame 1 and the support rod 4 is located above the hinge position between the backrest frame 1 and the seat frame 2; Figure 6 As shown, when the sofa bed is in bed mode, the hinge position between the backrest frame 1 and the support rod 4 is not higher than the hinge position between the backrest frame 1 and the seat frame 2. In this technical solution, in sofa mode, the hinge position between the backrest frame and the support rod is located above the hinge position between the backrest frame and the seat frame, ensuring that the backrest frame is tilted upwards at a certain angle relative to the seat frame. This allows the downward and backward force generated when the user leans against the backrest frame to be reliably transmitted to the base frame, preventing the backrest frame from accidentally tipping backward and ensuring the stability and safety of the sofa mode. In bed mode, the hinge position between the backrest frame and the support rod not being higher than the hinge position between the backrest frame and the seat frame is a key condition to ensure that the backrest frame can ultimately rotate to a horizontal state. This prevents the backrest frame from "getting stuck" due to its own structure or connection with the support rod when flattened, thus preventing it from being completely flat and causing the bed surface to tilt or bulge, which would seriously affect the massage experience and sleep comfort. This ensures that the backrest frame can perfectly flip over and stop in a horizontal plane, forming a flat, unobtrusive full-size bed surface together with the seat frame.

[0053] Further optimization involves ensuring that, when the sofa bed is in sofa mode, the angle between the support rod 4 and the base frame 3 is acute, and the angle between the support rod 4 and the backrest frame 1 is also acute. This ensures the ergonomic design of the backrest and the reliable support of the support rod, enabling stable switching and support between sofa bed and sofa bed modes, resulting in a better and more comfortable user experience, minimal load on the electric cylinder, and lower manufacturing costs.

[0054] like Figures 10-12As shown, the backrest frame 1 has connecting seats 14 on both sides of its back. Connecting seats 14 have connecting grooves 15, and through holes 100 are formed on the bottom surface of the connecting grooves 15. The upper end of the support rod 4 passes through the through hole 100 and is hinged to the backrest frame 1. The upper and lower inner walls of the connecting groove 15 form inclined surfaces that mate with the upper part of the support rod 4. In this technical solution, the upper part of the support rod passes through the through hole and is hinged to the hinge seat 101 on the backrest frame, providing a solid installation foundation for the upper hinge point of the support rod. Furthermore, the design of the connecting groove and the inclined surfaces effectively limits and guides the upper part of the support rod during state transitions, ensuring accurate movement trajectory, preventing detachment, and enhancing the overall rigidity and safety of the structure.

[0055] like Figure 8 , Figure 13 and Figure 17 As shown, an assembly seat 16 is provided on the rear side of the inner side of the base frame 3. The driving component is an electric cylinder 18. The mounting end of the electric cylinder 18 is hinged to the assembly seat 16, and a connecting sleeve 19 is provided on the movable end of the electric cylinder 18. Two connecting plates 20 are provided at the lower end of the mounting rod 5, and the connecting sleeve 19 is hinged between the two connecting plates 20. The electric cylinder 18 can drive the connecting sleeve 19 to move obliquely along the cylinder body, thereby rotating the mounting rod 5 and the support rod 4. In this technical solution, the driving component is an electric cylinder, and the assembly seat includes a U-shaped frame 161 and two L-shaped frames 162 fixed to the U-shaped frame. The mounting end of the electric cylinder is hinged to the U-shaped frame through a connecting bracket, and a connecting sleeve is provided on the output end of the electric cylinder. The connecting sleeve is hinged to the connecting plates on both sides of the lower end of the mounting rod, thus installing the electric cylinder on the inner side of the base frame. The structure is more compact, effectively reducing the assembly volume of the base frame. The electric cylinder drives the connecting sleeve to move on the cylinder body to push or pull the support rod, achieving precise control, smooth operation, and low noise. The dual-connector plate hinged design ensures the strength and high degree of freedom of the connection between the output end and the mounting rod, effectively withstands forces from all directions, and has a long service life and high reliability.

[0056] like Figure 19 and 20 As shown, a push rod 21 is hinged to the lower end of the backrest frame 1. The push rod 21 is hinged to a swing rod 22 on the seat frame 2. Both ends of the swing rod 22 are connected to a footrest linkage assembly 23. The footrest linkage assembly 23 is mounted on the seat frame 2 via a mounting plate 24. A footrest plate 25 is hinged to the front end of the footrest linkage assembly 23. When the backrest frame 1 tilts backward and moves forward, the push rod 21 acts on the footrest linkage assembly 23 through the swing rod 22 to make the footrest plate 25 flip upward and flatten. In this technical solution, the front end of the push rod is hinged to the footrest linkage assembly through the swing rod. This eliminates the need for a separate drive device. When the backrest frame tilts backward and moves forward, the push rod, swing rod, and footrest linkage assembly automatically push the footrest plate to a horizontally unfolded state, achieving a "lower leg lift" or "zero gravity" experience. This solution has high functional integration and a good user experience.

[0057] Specifically, the footrest linkage assembly includes a first footrest linkage 231, a second footrest linkage 232, a third footrest linkage 233, a fourth footrest linkage 234, and an extension plate 108. The two ends of the second footrest linkage 232 are respectively hinged to the mounting plate 24 and the rear side of the third footrest linkage 233. The two ends of the first footrest linkage 231 are respectively hinged to the mounting plate 24 and the middle and rear side of the third footrest linkage 233. The two ends of the swing arm are fixed between the first footrest linkages 231 on both sides. The front side of the third footrest linkage 233 is hinged to the extension plate 108. The two ends of the fourth footrest linkage 234 are respectively hinged to the lower end of the first footrest linkage 231 and the extension plate 108. The extension plate 10 is fixed to the footrest plate 25. The rotation of the swing arm causes the first footrest link 231 to extend forward, which in turn causes the third footrest link 233 and the fourth footrest link 234 to extend forward, which in turn causes the second footrest link 232 to extend forward, thereby causing the extension plate to extend forward and flip the footrest plate upward and flatten it.

[0058] It should also be noted here that, such as Figure 6 As shown, this type of backrest frame that moves forward and tilts backward, when in bed mode, ensures that the rear side of the backrest frame is basically parallel to the rear side of the base frame longitudinally, and that the upper parts of the backrest frame, base, and footrest are in a horizontally consistent state, resulting in a better user experience.

[0059] like Figure 1 As shown, a massage component 110 can be installed on the backrest frame of this solution, which can move on the side rails 111. The backrest frame moves forward and then reclines (…). Figure 6 As shown, it is positioned directly above the base frame, enabling a full-back massage bed mode. Furthermore, to address the discomfort caused by the massage heads protruding and pressing against the user's back when in sofa mode, the backrest fabric in this design can be inflatable. When not massaging, it inflates to provide a sofa-like feel while concealing the massage heads within the fabric; during massage, it deflates to provide a professional massage bed experience.

[0060] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0061] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.

Claims

1. A sofa bed, comprising a backrest frame (1), a seat frame (2), and a base frame (3), wherein the lower end of the backrest frame (1) is hinged to the rear end of the seat frame (2), characterized in that: It also includes a support rod (4), the upper end of which is hinged to the backrest frame (1), and the lower end of which is hinged to the rear of the base frame (3); the seat frame (2) can slide back and forth relative to the base frame (3); the base frame (3) is provided with a drive component, the mounting end of which is hinged to the base frame (3), and its movable end is hinged to the support rod (4); When the movable end of the drive component pushes the support rod (4), the upper end of the support rod (4) rotates upward, thereby driving the backrest frame (1) to stand up, and the sofa bed is in the sofa state; When the movable end of the drive component pulls back the support rod (4), the upper end of the support rod (4) rotates downward, thereby pushing the backrest frame (1) and the seat frame (2) forward, the backrest frame (1) is flattened, and the sofa bed is in bed state.

2. A sofa bed according to claim 1, characterized in that: The backrest frame (1) has two support rods (4) hinged to the lower back side, and a mounting rod (5) is connected between the two support rods (4). The movable end of the drive component is hinged to the mounting rod (5).

3. A sofa bed according to claim 1, characterized in that: The seat frame (2) is slidably disposed within the base frame (3). The base frame (3) has an opening on the front side. When the sofa bed is switched to bed mode, the seat frame (2) is pushed out of the base frame (3) along the opening by the backrest frame (1).

4. A sofa bed according to claim 3, characterized in that: The lower two sides of the seat frame (2) extend backward to form an extension rod (6), and the bottom front and rear sides of the extension rod (6) are provided with rollers (7).

5. A sofa bed according to claim 4, characterized in that: The base frame (3) has guide rails (8) on both sides inside, and the extension rod (6) has a slide rail (9) fixed on the outside that slides with the guide rails (8).

6. A sofa bed according to claim 1, characterized in that: When the sofa bed is in sofa mode, the hinge position of the backrest frame (1) and the support rod (4) is above the hinge position of the backrest frame (1) and the seat frame (2); when the sofa bed is in bed mode, the hinge position of the backrest frame (1) and the support rod (4) is not higher than the hinge position of the backrest frame (1) and the seat frame (2).

7. A sofa bed according to claim 1, characterized in that: The backrest frame (1) has connecting seats (14) on both sides of the back. Connecting slots (15) are provided on the connecting seats (14). Through holes (100) are provided on the bottom surface of the connecting slots (15). The upper end of the support rod (4) passes through the through holes (100) and is hinged to the backrest frame (1). The upper and lower inner walls of the connecting slots (15) form inclined surfaces that cooperate with the upper part of the support rod (4).

8. A sofa bed according to claim 2, characterized in that: The base frame (3) has an assembly seat (16) on its inner rear side. The driving component is an electric cylinder (18). The mounting end of the electric cylinder (18) is hinged to the assembly seat (16). The movable end of the electric cylinder (18) is provided with a connecting sleeve (19). The lower end of the mounting rod (5) is provided with two connecting plates (20). The connecting sleeve (19) is hinged between the two connecting plates (20). The electric cylinder (18) can drive the connecting sleeve (19) to move obliquely along the cylinder body, thereby driving the mounting rod (5) and the support rod (4) to rotate.

9. A sofa bed according to claim 1, characterized in that: The lower end of the backrest frame (1) is hinged with a push rod (21), which is hinged to a swing rod (22) on the seat frame (2). Both ends of the swing rod (22) are connected to a footrest linkage assembly (23). The footrest linkage assembly (23) is mounted on the seat frame (2) via a mounting plate (24). The front end of the footrest linkage assembly (23) is hinged with a footrest plate (25). When the backrest frame (1) tilts backward and moves forward, the push rod (21) acts on the footrest linkage assembly (23) through the swing rod (22) to make the footrest plate (25) flip upward.

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