Sofa bed

Abstract

The utility model discloses a sofa bed which comprises a fixed base and a movable base, and a containing cavity is formed in the fixed base; the movable base comprises a base body, a lifting seat and a connecting rod assembly, and the base body is arranged on the fixed base in the mode that the base body can enter and exit from the containing cavity in the horizontal direction; the connecting rod assembly comprises a first main connecting rod, a second main connecting rod and a first auxiliary connecting rod, the two ends of the first main connecting rod are hinged to the base body and the lifting base respectively, one end of the second main connecting rod is hinged to the lifting base, and the other end of the second main connecting rod is movably arranged on the base body. One end of the first auxiliary connecting rod is hinged between two ends of the second main connecting rod, and the other end is hinged to the base body. According to the connecting rod assembly, the stability of the whole connecting rod assembly can be improved, and the force needing to be applied for lifting the lifting seat can be reduced.

Description

Technical Field

[0001] This application relates to the field of furniture technology, and more particularly to a sofa bed. Background Technology

[0002] In the furniture industry, sofa beds, as products that combine the functions of a sofa and a bed, have received widespread attention and application. They can achieve functional transformation within a limited space, meeting the user's needs in different scenarios.

[0003] In related technologies, the key to realizing the conversion between sofa and bed functions lies in its movable base and linkage assembly. However, the linkage assemblies used in most sofa beds have many defects. On the one hand, the structural stability of the linkage assembly is poor, which can easily affect the safety and comfort of the sofa bed. On the other hand, due to the unreasonable structural design of the linkage assembly, the lifting seat in the movable base is relatively difficult to raise during the lifting process, requiring users to expend a lot of effort when operating it, resulting in a poor user experience. Utility Model Content

[0004] In view of the above-mentioned shortcomings in the related technologies, this application provides a sofa bed to solve the problems of poor stability of the linkage assembly and difficulty in raising the lifting seat in the related technologies.

[0005] To address the aforementioned technical problems, in a first aspect, this application provides a sofa bed, which includes:

[0006] A fixed base, wherein a storage cavity is provided inside the fixed base;

[0007] The movable base includes:

[0008] A base body, which is horizontally accessible from the storage cavity and is mounted on the fixed base;

[0009] Elevate the seat;

[0010] A linkage assembly, wherein the linkage assembly is used to movably mount the lifting seat on the base body in the vertical direction, and to connect the lifting seat to the fixed base, the linkage assembly comprising:

[0011] The first main connecting rod has its two ends hinged to the base body and the lifting seat, respectively.

[0012] The second main connecting rod has one end hinged to the lifting seat and the other end movably disposed on the base body;

[0013] The first auxiliary link has one end hinged between the two ends of the second main link and the other end hinged to the base body.

[0014] In a possible implementation of the first aspect, the linkage assembly further includes:

[0015] The second auxiliary link has one end hinged to the base body and the other end hinged to the other end of the second main link, so that the other end of the second main link is movably mounted on the base body via the second auxiliary link.

[0016] In a possible implementation of the first aspect, the first main connecting rod has a first hinge point with the base body, the first secondary connecting rod has a second hinge point with the base body, and the second secondary connecting rod has a third hinge point with the base body, the third hinge point being located between the first hinge point and the second hinge point.

[0017] In a possible implementation of the first aspect, the linkage assembly further includes:

[0018] A limiting member is provided on the base body, and the limiting member is used to restrict the second auxiliary connecting rod from swinging upward when the top of the lifting seat is flush with the top of the fixed base.

[0019] In one possible implementation of the first aspect, a limiting notch is provided on the side of the second auxiliary connecting rod near the limiting member, the limiting notch allowing the limiting member to enter.

[0020] In a possible implementation of the first aspect, the linkage assembly further includes:

[0021] A third main connecting rod is disposed on the lifting seat and hinged to the first main connecting rod and the second main connecting rod, such that the first main connecting rod and the second main connecting rod are hinged to the lifting seat via the third main connecting rod; and / or,

[0022] A fourth main connecting rod is disposed on the base body and is hinged to the first main connecting rod, the first secondary connecting rod, and the second secondary connecting rod, so that the first main connecting rod, the first secondary connecting rod, and the second secondary connecting rod are hinged to the base body through the fourth main connecting rod.

[0023] In one possible implementation of the first aspect, the limiting member is disposed on the fourth main connecting rod, so that the limiting member is indirectly disposed on the base body through the fourth main connecting rod.

[0024] In one possible implementation of the first aspect, the lifting seat includes:

[0025] Lift the frame;

[0026] An elastic support member is disposed at the top of the lifting frame;

[0027] A seat cushion, which is disposed above the elastic support member.

[0028] In one possible implementation of the first aspect, the lifting frame is a rectangular frame, and four elastic supports are provided, with the four elastic supports respectively located at the four corners of the rectangular frame.

[0029] In one possible implementation of the first aspect, the sofa bed further includes:

[0030] Backrest;

[0031] armrest;

[0032] The fixed base is detachably connected to the backrest and the armrest.

[0033] Compared with related technologies, this application has at least the following beneficial effects:

[0034] In this application, for the linkage assembly, the first main linkage is hinged at both ends to the base body and the lifting seat, respectively. The second main linkage has one end hinged to the lifting seat and the other end movably mounted on the base body. Furthermore, the first auxiliary linkage has one end hinged between the two ends of the second main linkage and the other end hinged to the base body. Therefore, when the lifting seat is subjected to external force, while the first main linkage bears the weight and external force from the lifting seat, the second main linkage can transfer a portion of the force to the base body. The first auxiliary linkage, through its connection with the second main linkage, can further distribute the force to different parts of the base body. In other words, the second main linkage and the first auxiliary linkage can jointly share the weight and external force from the lifting seat, thereby reducing the stress on individual linkages or connection points. Simultaneously, the second main linkage, the first auxiliary linkage, and the base body form a stable triangular structure. This improves the load-bearing capacity and stability of the entire linkage assembly, thereby enhancing the safety and comfort of the sofa bed.

[0035] On the other hand, the second main link and the first auxiliary link can together form a lever-like structure. The hinge point between the second main link and the first auxiliary link can be regarded as a force-bearing point of the lever. When the lifting seat is raised, the transmission and action of force are optimized through this lever structure, further reducing the force required to raise the lifting seat. As a result, the user only needs to exert less force to raise the lifting seat, which helps to improve the user experience. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the embodiments 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.

[0037] Figure 1 A perspective view of a sofa bed in bed form provided for an embodiment of this application;

[0038] Figure 2 A perspective view of a sofa bed in sofa form provided for an embodiment of this application;

[0039] Figure 3 A perspective view of a portion of the structure of the sofa bed provided in an embodiment of this application;

[0040] Figure 4 One of the cross-sectional views of the sofa bed provided in the embodiments of this application;

[0041] Figure 5 A second cross-sectional view of the sofa bed provided in an embodiment of this application;

[0042] Figure 6 A third cross-sectional view of the sofa bed provided in the embodiments of this application;

[0043] Figure 7 Fourth cross-sectional view of the sofa bed provided in the embodiments of this application;

[0044] Figure 8 Fifth cross-sectional view of the sofa bed provided in the embodiments of this application;

[0045] Figure 9 for Figure 4 Enlarged view of part A in the middle.

[0046] Explanation of reference numerals in the attached figures:

[0047] 1-Fixed base; 11-Storage cavity; 12-Railway; 13-Limiting block;

[0048] 2-Moving base; 21-Base body; 22-Lifting seat; 221-Lifting frame; 222-Elastic support; 23-Link assembly; 231-First main link; 232-Second main link; 233-First auxiliary link; 234-Second auxiliary link; 2341-Limiting notch; 235-Limiting component; 236-Third main link; 237-Fourth main link;

[0049] 3-Backrest;

[0050] 4-Handrail. Detailed Implementation

[0051] 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.

[0052] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0053] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0054] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; 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, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0055] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0056] As described in the background section of this application, in the furniture industry, sofa beds, as products that combine the functions of a sofa and a bed, have received widespread attention and application. They can achieve functional transformation within a limited space, meeting the user's needs in different scenarios.

[0057] In related technologies, the key to realizing the conversion between sofa and bed functions lies in its movable base and linkage assembly. However, the linkage assemblies used in most sofa beds have many defects. On the one hand, the structural stability of the linkage assembly is poor, which can easily affect the safety and comfort of the sofa bed. On the other hand, due to the unreasonable structural design of the linkage assembly, the lifting seat in the movable base is relatively difficult to raise during the lifting process, requiring users to expend a lot of effort when operating it, resulting in a poor user experience.

[0058] In view of the above-mentioned problems, this application provides a sofa bed to solve the problems of poor stability of the linkage assembly and difficulty in raising the lifting seat in the related technology.

[0059] The technical solution of this application will be further described below with reference to specific embodiments and accompanying drawings:

[0060] like Figure 1 , Figure 2 and Figure 3 As shown, the sofa bed includes a fixed base 1 and a movable base 2, wherein, as... Figure 3 As shown, a storage cavity 11 is provided inside the fixed base 1.

[0061] like Figure 1 and Figure 4 As shown, the movable base 2 includes a base body 21, a lifting seat 22, and a connecting rod assembly 23. The base body 21 is positioned along the horizontal direction (e.g., ...). Figure 4 The lifting seat 22 is mounted on the fixed base 1 and can enter and exit the storage cavity 11 in the X direction. The connecting rod assembly 23 is used to move the lifting seat 22 in the vertical direction (e.g., in the X direction). Figure 4 The Z-direction of the base is movably disposed on the base body 21 and is used to connect the lifting seat 22 with the fixed base 1.

[0062] like Figure 4 As shown, the linkage assembly 23 includes a first main linkage 231, a second main linkage 232, and a first auxiliary linkage 233. The two ends of the first main linkage 231 are hinged to the base body 21 and the lifting seat 22, respectively. One end of the second main linkage 232 is hinged to the lifting seat 22, and the other end is movably disposed on the base body 21. One end of the first auxiliary linkage 233 is hinged between the two ends of the second main linkage 232, and the other end is hinged to the base body 21.

[0063] In this application, to convert the sofa bed into bed mode, the movable base 2 can first be pulled out of the storage cavity 11 of the fixed base 1 by pulling the base body 21. After being pulled out, under the action of the linkage assembly 23, the lifting seat 22 can be gradually raised by applying an upward force. When the lifting seat 22 rises to be flush with the fixed base 1, under the action of the linkage assembly 23, the lifting seat 22 can be kept in a spliced ​​state with the fixed base 1, thereby increasing the support area of ​​the sofa bed and enabling the sofa bed to function as a bed. To convert the sofa bed into sofa mode, the movable base 2 can simply be stored back into the storage cavity 11 of the fixed base 1.

[0064] For the linkage assembly 23, since the two ends of the first main linkage 231 are respectively hinged to the base body 21 and the lifting seat 22, and since one end of the second main linkage 232 is hinged to the lifting seat 22 and the other end is movably disposed on the base body 21, and one end of the first auxiliary linkage 233 is hinged between the two ends of the second main linkage 232 and the other end is hinged to the base body 21. Therefore, on the one hand, when the lifting seat 22 is subjected to external force, in addition to the first main connecting rod 231 bearing the weight and external force from the lifting seat 22, the second main connecting rod 232 can transfer a portion of the force to the base body 21. The first auxiliary connecting rod 233, through its connection with the second main connecting rod 232, can further distribute the force to different parts of the base body 21. That is, the second main connecting rod 232 and the first auxiliary connecting rod 233 can jointly share the weight and external force from the lifting seat 22, thereby reducing the stress on individual connecting rods or connection points. At the same time, the second main connecting rod 232, the first auxiliary connecting rod 233, and the base body 21 also form a stable triangular structure. This improves the load-bearing capacity and stability of the entire connecting rod assembly 23, thereby enhancing the safety and comfort of the sofa bed.

[0065] On the other hand, the second main link 232 and the first auxiliary link 233 can together form a lever-like structure. The hinge point between the second main link 232 and the first auxiliary link 233 can be regarded as a force-bearing point of the lever. When the lifting seat 22 is raised, the transmission and action of force are optimized through this lever structure, further reducing the force required to raise the lifting seat 22. As a result, the user only needs to exert a small amount of force to raise the lifting seat 22, which helps to improve the user experience.

[0066] Similarly, the lever structure described above optimizes the transmission and action of force when lowering the lifting seat 22, further reducing the force required to lower the lifting seat 22. As a result, users only need to exert less force to lower the lifting seat 22, which also helps to improve the user experience.

[0067] Furthermore, such as Figure 3As shown, a track 12 is provided on the fixed base 1, and the track 12 is located in the storage cavity 11. The base body 21 of the movable base 2 is provided with a roller that rolls with the track 12 or a slider that slides with the track 12. Through the cooperation of the track 12 with the roller or slider, the base body 21 can be set on the fixed base 1 in a horizontal direction, moving in and out of the storage cavity 11.

[0068] like Figure 3 As shown, a limiting block 13 is also provided on the fixed base 1. The limiting block 13 is used to limit the base body 21 during the process of the base body 21 exiting the storage cavity 11, so as to prevent the movable base 2 from detaching from the fixed base 1.

[0069] With this design, on the one hand, the base body 21, through the cooperation of rollers or sliders with the track 12, allows the base body 21 to smoothly enter and exit the storage cavity 11 in a horizontal direction. On the other hand, since the rolling friction of the rollers or the sliding friction of the sliders are relatively small, the resistance during the movement is effectively reduced, making it easier and less strenuous for the user to push the moving base 2. It also reduces the wear and tear on parts caused by excessive friction, thus extending the service life of the sofa bed.

[0070] On the other hand, since the limiting block 13 and the base body 21 limit each other, the movable base 2 can be prevented from moving excessively and detaching from the fixed base 1. Therefore, the situation that the sofa bed structure may be damaged due to the accidental detachment of the movable base 2 can be avoided, thereby avoiding potential safety threats to the user and ensuring the safety of the user during the use of the sofa bed.

[0071] For link assembly 23, further, as Figure 4 As shown, the linkage assembly 23 also includes a second auxiliary linkage 234, one end of which is hinged to the base body 21 and the other end is hinged to the other end of the second main linkage 232, so that the other end of the second main linkage 232 is movably mounted on the base body 21 via the second auxiliary linkage 234.

[0072] With this configuration, on the one hand, the other end of the second main connecting rod 232 is movably mounted on the base body 21 via the second auxiliary connecting rod 234. This not only facilitates the movable mounting of the other end of the second main connecting rod 232 on the base body 21, but also eliminates the need for a structure on the base body 21 that cooperates with the movable other end of the second main connecting rod 232. This simplifies the structure of the base body 21 and facilitates its processing and manufacturing.

[0073] On the other hand, the other end of the second main connecting rod 232 is movably mounted on the base body 21 via the second auxiliary connecting rod 234, which helps to increase the overall freedom of movement of the connecting rod assembly 23. This allows for smoother and more flexible movement of the lifting seat 22 during function conversion of the sofa bed, better adapting to different movement trajectories and angle changes. This makes the process of converting the sofa bed from sofa form to bed form, and vice versa, more stable and natural, thereby improving the user's operating experience.

[0074] In other embodiments, a guide groove is provided on the base body 21. The guide groove is an elongated groove, and the length direction of the guide groove extends along the movement trajectory of the other end of the second main connecting rod 232. The other end of the second main connecting rod 232 is movably disposed in the guide groove, thereby allowing the other end of the second main connecting rod 232 to be movably disposed on the base body 21.

[0075] This configuration eliminates the need for a second connecting rod 234, thus simplifying the structure of the connecting rod assembly 23 and facilitating its manufacturing and assembly.

[0076] Furthermore, such as Figure 4 As shown, the first main connecting rod 231 has a first hinge point with the base body 21, the first secondary connecting rod 233 has a second hinge point with the base body 21, and the second secondary connecting rod 234 has a third hinge point with the base body 21, and the third hinge point is located between the first hinge point and the second hinge point.

[0077] With this configuration, when the sofa bed needs to be transformed from bed mode to sofa mode, the connecting rods in the linkage assembly 23, the lifting seat 22, and the base body 21 can be arranged sequentially. Figure 4 , Figure 5 , Figure 6 , Figure 7 as well as Figure 8 The sequential operation facilitates the transformation of the sofa bed from bed mode to sofa mode. Conversely, when the sofa bed needs to be transformed from sofa mode to bed mode, the links in the linkage assembly 23, the lifting seat 22, and the base body 21 can be operated in sequence according to the following steps. Figure 8 , Figure 7 , Figure 6 , Figure 5 as well as Figure 4 The sequential operation facilitates the transformation of the sofa bed from sofa to bed mode.

[0078] By placing the third hinge point between the first hinge point and the second hinge point, the second auxiliary link 234 can be located in the space between the second main link 232 and the first main link 231. This reduces the space occupied by the link assembly 23 in the arrangement direction of the second main link 232 and the first main link 231, facilitates the compact design of the link assembly 23, and makes it easier to install the link assembly 23 in the movable base 2.

[0079] In other embodiments, the third hinge point can be located on the side of the second hinge point away from the first hinge point. In this case, the first auxiliary link 233 is located between the second main link 232 and the first main link 231, and the second auxiliary link 234 is located on the side of the second main link 232 away from the first main link 231, that is, the second auxiliary link 234 is located outside the space between the second main link 232 and the first main link 231. This arrangement allows the placement of the second auxiliary link 234 to be unrestricted by the space between the second main link 232 and the first main link 231, which facilitates the placement of the second auxiliary link 234.

[0080] Furthermore, such as Figure 9 As shown, the linkage assembly 23 also includes a limiting member 235, which is disposed on the base body 21. The limiting member 235 is used to restrict the second linkage 234 from swinging upward when the top of the lifting seat 22 is flush with the top of the fixed base 1.

[0081] This design serves two purposes. First, when the top of the lifting seat 22 is flush with the top of the fixed base 1, the limiting member 235 restricts the upward swing of the second connecting rod 234. This ensures that the lifting seat 22 stops accurately at the predetermined position, allowing the sofa bed to achieve a precise level when transforming from sofa mode to bed mode, providing a flat sleeping surface and enhancing the user experience. Second, it effectively prevents the lifting seat 22 from being excessively lifted due to excessive upward swing of the second connecting rod 234, thereby preventing structural damage or functional impairment caused by excessive lifting.

[0082] On the other hand, limiting the upward swing of the second connecting rod 234 by the limiting component 235 helps the connecting rod assembly 23 form a more stable support structure when the sofa bed is in bed mode. This means that when the user uses the sofa bed, the structure can better withstand the weight of the human body and various dynamic pressures, reducing the risk of the sofa bed shaking or collapsing due to the swing of the connecting rod, and ensuring the safety of the user.

[0083] Furthermore, such as Figure 9 As shown, a limiting notch 2341 is provided on the side of the second connecting rod 234 near the limiting member 235, and the limiting notch 2341 allows the limiting member 235 to enter.

[0084] With this configuration, when the limiting member 235 engages with the second connecting rod 234, the limiting member 235 will be located within the limiting notch 2341. This cleverly utilizes the structure of the second connecting rod 234 itself, eliminating the need for the limiting member 235 to occupy external space. While ensuring the limiting function, this achieves a compact design for the connecting rod assembly 23. This helps to more rationally arrange components within the limited internal space of the sofa bed, improving space utilization.

[0085] For link assembly 23, further, as Figure 4 As shown, the linkage assembly 23 further includes a third main linkage 236, which is disposed on the lifting seat 22 and hinged to the first main linkage 231 and the second main linkage 232, such that the first main linkage 231 and the second main linkage 232 are hinged to the lifting seat 22 via the third main linkage 236. And / or, as Figure 4 As shown, the linkage assembly 23 also includes a fourth main linkage 237, which is disposed on the base body 21 and is hinged to the first main linkage 231, the first secondary linkage 233 and the second secondary linkage 234, so that the first main linkage 231, the first secondary linkage 233 and the second secondary linkage 234 are hinged to the base body 21 through the fourth main linkage 237.

[0086] With this configuration, the third main connecting rod 236 is hinged to the first main connecting rod 231 and the second main connecting rod 232 and is positioned on the lifting seat 22, forming a stable connecting frame at the lifting seat 22. This structural design increases the stability of the connection between the lifting seat 22 and the first and second main connecting rods 231 and 232, allowing the force to be distributed more evenly across the connecting rods when the lifting seat 22 bears weight. This reduces the possibility of excessive local stress, avoids structural deformation or damage caused by single-point stress, and improves the overall stability of the sofa bed during use.

[0087] The fourth main connecting rod 237 is hinged to the first main connecting rod 231, the first secondary connecting rod 233, and the second secondary connecting rod 234 and is mounted on the base body 21, further strengthening the connection between the base body 21 and the first main connecting rod 231, the first secondary connecting rod 233, and the second secondary connecting rod 234, thereby forming a more robust foundation support structure. This effectively improves the stability and load-bearing capacity of the entire connecting rod assembly 23 when subjected to pressure from the lifting seat 22 and various external forces during the use of the sofa bed.

[0088] In other embodiments, the first main connecting rod 231 and the second main connecting rod 232 can be directly hinged to the lifting seat 22. This arrangement eliminates the need for a third main connecting rod 236, thereby simplifying the structural composition of the connecting rod assembly 23 and facilitating its manufacturing and assembly.

[0089] In other embodiments, the first main connecting rod 231, the first secondary connecting rod 233, and the second secondary connecting rod 234 can be directly hinged to the base body 21. This arrangement eliminates the need for a fourth main connecting rod 237, thereby simplifying the structural composition of the connecting rod assembly 23 and facilitating its manufacturing and assembly.

[0090] Furthermore, such as Figure 9 As shown, the limiting member 235 is disposed on the fourth main connecting rod 237 so that the limiting member is indirectly disposed on the base body through the fourth main connecting rod.

[0091] With this configuration, on the one hand, the fourth main connecting rod 237 not only allows the limiting member 235 to be indirectly mounted on the base body 21, but also enhances the stability of the setting position of the limiting member 235, thereby enhancing the reliability of the limiting member 235 and the second auxiliary connecting rod 234 in limiting cooperation.

[0092] On the other hand, without the need to separately set the installation position of the limiting member 235 on the base body 21, the internal space of the linkage assembly 23 is utilized more fully, achieving a compact structural design. This compact layout helps to rationally arrange the components in the limited internal space of the sofa bed, avoid mutual interference between the components, and improve the overall space utilization rate.

[0093] Regarding the lifting seat 22, further, as Figure 1 As shown, the lifting seat 22 includes a lifting frame 221, an elastic support member 222, and a seat cushion. The elastic support member 222 is disposed on the top of the lifting frame 221, and the seat cushion is disposed above the elastic support member 222.

[0094] With this design, the elastic support 222 can provide elastic cushioning for the seat cushion. When the user sits or lies on the sofa bed, the elastic support 222 can deform accordingly according to the pressure and movement of the human body, dispersing the pressure of the human body on the lifting seat 22, avoiding excessive local pressure, and providing more even support to the body, thereby improving comfort.

[0095] In addition, the elastic support 222 can provide cushioning for the lifting frame 221, thereby preventing excessive local stress on the lifting frame 221 and causing deformation or damage. This helps maintain the structural integrity of the lifting frame 221 and ensures the stability and reliability of the sofa bed during long-term use.

[0096] Furthermore, such as Figure 1 As shown, the lifting frame 221 is a rectangular frame, and four elastic support members 222 are provided, which are respectively located at the four corners of the rectangular frame.

[0097] Four elastic support members 222 are respectively set at the four corners of the rectangular frame, which can effectively bear and evenly distribute the pressure from the cushion and the human body. In this way, no matter where the user sits or lies on the sofa bed, the pressure can be transmitted through the cushion to the elastic support members 222 at the four corners, providing the user with stable and balanced support.

[0098] In other embodiments, multiple elastic supports 222 are provided, and the multiple elastic supports 222 are arranged in an array on the lifting frame 221; or, a single elastic support 222 is provided, and the elastic support 222 is an elastic support pad, which is stacked on top of the lifting frame 221. Therefore, the number of elastic supports 222 and their arrangement on the lifting frame 221 are quite flexible, and can be selected according to actual needs. This application embodiment does not impose specific limitations on this.

[0099] Regarding the elastic support 222, in this embodiment, the material of the elastic support 222 can be spring, sponge, rubber or silicone, etc. The material selection of the elastic support 222 is relatively flexible. Specifically, it can be selected according to actual needs. This embodiment does not make specific limitations in this regard.

[0100] Furthermore, regarding sofa beds, such as Figure 1 , Figure 2 and Figure 3 As shown, the sofa bed also includes a backrest 3 and armrests 4, and the fixed base 1 is detachably connected to the backrest 3 and armrests 4.

[0101] This design allows the backrest 3 and armrests 4 to be detached from the fixed base 1 during transportation, significantly reducing the overall size of the sofa bed and making it easier to load into a transport vehicle, thus improving space utilization and reducing transportation costs. The smaller size also makes it easier to move, especially when passing through narrow hallways or doorways, reducing the risk of bumps and damage.

[0102] In addition, after disassembly, the relatively light weight of each component makes it easier for one or a small number of people to carry out the handling operation, reducing physical exertion and labor costs during the handling process, and lowering the risk of personal injury that may result from carrying excessively heavy or large objects.

[0103] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A sofa bed, characterized in that, include: A fixed base, wherein a storage cavity is provided inside the fixed base; The movable base includes: A base body, which is horizontally accessible from the storage cavity and is mounted on the fixed base; Elevate the seat; A linkage assembly, wherein the linkage assembly is used to movably mount the lifting seat on the base body in the vertical direction, and to connect the lifting seat to the fixed base, the linkage assembly comprising: The first main connecting rod has its two ends hinged to the base body and the lifting seat, respectively. The second main connecting rod has one end hinged to the lifting seat and the other end movably disposed on the base body; The first auxiliary link has one end hinged between the two ends of the second main link and the other end hinged to the base body.

2. The sofa bed according to claim 1, characterized in that, The linkage assembly also includes: The second auxiliary link has one end hinged to the base body and the other end hinged to the other end of the second main link, so that the other end of the second main link is movably mounted on the base body via the second auxiliary link.

3. The sofa bed according to claim 2, characterized in that, The first main connecting rod has a first hinge point with the base body, the first secondary connecting rod has a second hinge point with the base body, and the second secondary connecting rod has a third hinge point with the base body, the third hinge point being located between the first hinge point and the second hinge point.

4. The sofa bed according to claim 2 or 3, characterized in that, The linkage assembly also includes: A limiting member is provided on the base body, and the limiting member is used to restrict the second auxiliary connecting rod from swinging upward when the top of the lifting seat is flush with the top of the fixed base.

5. The sofa bed according to claim 4, characterized in that, A limiting notch is provided on the side of the second auxiliary connecting rod near the limiting member, and the limiting notch allows the limiting member to enter.

6. The sofa bed according to claim 4, characterized in that, The linkage assembly also includes: A third main connecting rod is disposed on the lifting seat and hinged to the first main connecting rod and the second main connecting rod, such that the first main connecting rod and the second main connecting rod are hinged to the lifting seat via the third main connecting rod; and / or, A fourth main connecting rod is disposed on the base body and is hinged to the first main connecting rod, the first secondary connecting rod, and the second secondary connecting rod, so that the first main connecting rod, the first secondary connecting rod, and the second secondary connecting rod are hinged to the base body through the fourth main connecting rod.

7. The sofa bed according to claim 6, characterized in that, The limiting member is disposed on the fourth main connecting rod, so that the limiting member is indirectly disposed on the base body through the fourth main connecting rod.

8. The sofa bed according to any one of claims 1 to 3, characterized in that, The lifting seat includes: Lift the frame; An elastic support member is disposed at the top of the lifting frame; A seat cushion, which is disposed above the elastic support member.

9. The sofa bed according to claim 8, characterized in that, The lifting frame is a rectangular frame, and four elastic support members are provided, which are respectively located at the four corners of the rectangular frame.

10. The sofa bed according to any one of claims 1 to 3, characterized in that, The sofa bed also includes: Backrest; armrest; The fixed base is detachably connected to the backrest and the armrest.

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