A functional base for a zero-wall sofa

Abstract

The application provides a functional base for a zero-wall sofa, and belongs to the technical field of sofas. The functional base comprises a lower base frame, an upper base frame, a movable frame, a backrest assembly, a foot support assembly, a sliding assembly, a lifting driving device for driving the upper base frame to rotate around a hinge point to adjust a zero-gravity inclination angle, and a moving driving device for driving the foot support assembly to expand or retract and driving the movable frame to slide forward and backward relative to the upper base frame. The lifting driving device and the moving driving device are independently arranged to control the inclination angle of the upper base frame and the movement of the movable frame, respectively, so that the decoupling adjustment of the zero-gravity inclination angle and the zero-wall function is realized, and the linkage rod is adopted to simplify the driving structure of the foot support assembly, and the functional base has the advantages of compact structure, flexible control and stable operation.

Description

Technical Field

[0001] This utility model belongs to the field of sofa technology, and specifically relates to a functional base for a sofa that can be placed against a wall. Background Technology

[0002] In modern home life, sofas have gradually evolved from simple seating into multifunctional furniture that combines rest and relaxation. Consumers have placed higher demands on the comfort, functionality, and spatial adaptability of sofas. Among these, "zero wall support" and "zero gravity" are key features that enhance the user experience of sofas and have received widespread attention. The "zero wall support" function allows the sofa backrest to be adjusted without relying on a wall for support, effectively saving indoor space and improving layout flexibility; the "zero gravity" function simulates the natural posture of the human body in a zero-gravity environment, evenly distributing body weight throughout the sofa, reducing pressure on the spine and joints, and achieving a more comfortable resting experience.

[0003] However, current multifunctional sofa products on the market have significant technical limitations in the coordinated design of "zero-wall" and "zero-gravity" functions. Most products can only achieve the "zero-gravity" function alone, failing to meet the "zero-wall" usage needs in compact spaces. Some products with "zero-wall" potential can only passively achieve the "zero-wall" action during "zero-gravity" adjustment, with the adjustment logics of the two functions intertwined and unable to be independently controlled according to the user's actual needs. Traditional sofas mostly adopt a structure of "single base frame + fixed linkage components," where the adjustment power source and transmission path of the backrest and footrest are interconnected, lacking an independently controllable frame adjustment module. At the same time, the design of the support structure does not distinguish between the backrest tilt adjustment function required for "zero-wall" and the overall angle adjustment function required for "zero-gravity," resulting in the inability to achieve decoupled control between the two.

[0004] To address the aforementioned issues, existing technologies urgently need improvement. Utility Model Content

[0005] The purpose of this application is to provide a functional base for a zero-wall-adhesion sofa, as well as its backrest assembly, footrest assembly, and sliding assembly, which has the advantages of independent control of zero-gravity tilt angle and zero-wall-adhesion function, simplified structure, and improved stability.

[0006] This application provides a functional base for a zero-wall-leaning sofa, the technical solution of which is as follows: A functional base for a zero-wall-leaning sofa includes: a lower base frame with a third crossbar; an upper base frame, the rear end of which is hinged to the lower base frame, and the upper base frame also has a first crossbar and a second crossbar; a movable frame and a sliding assembly, wherein the movable frame is movably positioned above the upper base frame via the sliding assembly; and a lifting drive device, the main body of which is hinged to the third crossbar, and the drive end of which is hinged to the second crossbar, for driving the upper base frame to rotate around the hinge point to adjust the zero-wall-leaning position. Gravity tilt angle; two sets of backrest assemblies, each set connected between the movable frame and the upper base frame, used to change the backrest tilt angle as the movable frame moves; two sets of footrest assemblies, each set connected to the movable frame, which can move between the unfolded position and the retracted position; a second linkage rod, the two ends of which are respectively connected to the power input ends of the two sets of footrest assemblies; a moving drive device, the main body of which is hinged to the first crossbar, and the drive end of which is hinged to the second linkage rod, used to drive the footrest assemblies to unfold or retract, and to drive the movable frame to slide back and forth relative to the upper base frame.

[0007] Furthermore, this application also proposes that each backrest assembly includes a backrest rod hinged to the movable frame, and a first linkage rod hinged to both the upper base frame and the backrest rod. Furthermore, this application also proposes that each set of footrest assemblies includes a first footrest link and a second footrest link hinged to the movable frame, a third footrest link hinged to the first footrest link, a fourth footrest link hinged to the second footrest link, and a footrest member with one end and the middle portion respectively hinged to the third footrest link and the fourth footrest link, wherein the third footrest link and the second footrest link are cross-hinged; the first footrest link is used as the power input end of the footrest assembly, and the two ends of the second linkage are respectively connected to the first footrest link of the two sets of footrest assemblies.

[0008] Furthermore, this application also proposes that the second linkage rod and the first foot support linkage are rigidly connected.

[0009] Furthermore, this application also proposes that the sliding assembly includes: a track fixed to the upper base frame and extending in the front-rear direction, and a slider fixed to the movable frame and slidingly engaging with the track.

[0010] Furthermore, this application also proposes that the lower base frame is provided with support rods arranged on both sides of the rear end of the lower base frame, and the rear ends of the upper base frame are respectively hinged to the two support rods.

[0011] Furthermore, this application also proposes that the front end of the upper base frame is provided with a downwardly extending support leg.

[0012] Furthermore, this application also proposes that the first crossbar is arranged in front of the second crossbar.

[0013] Furthermore, this application also proposes that the lifting drive device and the moving drive device adopt electric push rods.

[0014] Furthermore, this application also proposes that the contact surfaces between the slider and the track form a sliding fit through a planar bonding method.

[0015] As can be seen from the above, the functional base for a zero-wall-leaning sofa provided in this application includes a lower base frame, an upper base frame, a movable frame, a backrest assembly, a footrest assembly, and a sliding assembly. The tilt angle of the upper base frame and the movement of the movable frame are controlled by independently set lifting drive devices and moving drive devices, respectively, to achieve decoupled adjustment of zero-gravity tilt angle and zero-wall-leaning function. At the same time, the use of linkage rod simplifies the driving structure of the footrest assembly, which has the advantages of compact structure, flexible control and stable operation. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the base.

[0017] Figure 2 This is a diagram illustrating how the base can be adjusted to be against a wall without any contact with the wall.

[0018] Figure 3 A schematic diagram showing the base when adjusted to zero gravity.

[0019] Labeling Explanation: 10. Lower base frame; 11. Support rod; 12. Third crossbar; 20. Upper base frame; 21. Support leg; 22. First crossbar; 23. Second crossbar; 30. Movable frame; 41. Backrest rod; 42. First linkage rod; 51. First foot support link; 52. Second foot support link; 53. Third foot support link; 54. Fourth foot support link; 55. Foot support component; 60. Lifting drive device; 70. Moving drive device; 81. Track; 82. Sliding bar; 90. Second linkage rod. Detailed Implementation

[0020] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. The components of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application. It should be noted that similar reference numerals and letters in the following drawings indicate similar items; therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0021] In existing technologies, sofas, as core furniture in home spaces, directly impact user experience through their functional design. With increasingly compact living spaces and rising demands for comfort, sofas combining "zero-wall" and "zero-gravity" functions have become a market trend. However, traditional sofas often employ a single-layer frame structure, causing backrest tilt adjustment and overall angle adjustment to share the same drive source, resulting in interdependent functional actions. For example, when a user adjusts the zero-gravity tilt angle, the backrest will passively tilt accordingly, making it impossible to independently control the zero-wall function. This forced linkage limits user freedom in different scenarios, especially when adjusting the backrest angle independently, requiring a simultaneous change in overall posture, creating a conflict between space utilization and comfort.

[0022] To address the aforementioned issues, the inventors observed that the mechanical coupling of existing sofa function adjustments stems from the simplicity of their structural layout. Analysis revealed that by decomposing the overall support structure into relatively movable layered frames and configuring independent drive devices for different functions, the physical separation of the motion paths can be achieved. Specifically, the approach involves: constructing a hinged structure between the lower base frame 10 and the upper base frame 20, allowing the overall angle adjustment of the upper base frame 20 to be independent of other components; setting up a movable frame 30, which, through a sliding component, forms a relative displacement with the upper base frame 20, thereby separating the transmission paths of the backrest adjustment and the overall tilt adjustment; and simultaneously designing a linkage structure between the footrest assembly and the movable frame 30.

[0023] Therefore, this application proposes a functional base for a wall-mounted sofa, including a lower base frame 10, an upper base frame 20, a movable frame 30, a sliding assembly, a lifting drive device 60, two sets of backrest assemblies, two sets of footrest assemblies, a second linkage rod 90, and a movement drive device 70. (Refer to...) Figure 1The lower base frame 10 is provided with a third crossbar 12. The rear end of the upper base frame 20 is hinged to the lower base frame 10 and has a first crossbar 22 and a second crossbar 23. The movable frame 30 is movably mounted above the upper base frame 20 via a sliding assembly. The main body of the lifting drive device 60 is hinged to the third crossbar 12, and the drive end is hinged to the second crossbar 23 to drive the upper base frame 20 to rotate and adjust the zero-gravity tilt angle. Two sets of backrest assemblies connect the movable frame 30 and the upper base frame 20, changing the backrest tilt angle as the movable frame 30 moves. Two sets of footrest assemblies connect the movable frame 30 and can move between the extended and retracted positions. The two ends of the second linkage rod 90 are connected to the power input ends of the footrest assemblies. The main body of the moving drive device 70 is hinged to the first crossbar 22, and the drive end is hinged to the second linkage rod 90 to drive the footrest assemblies to move and link the movable frame 30 to slide.

[0024] The lower base frame 10 refers to the bottom support frame that supports the overall structure. Specifically, it can be a rectangular frame formed by welding metal tubing. The third crossbar 12 is horizontally fixed to the frame, providing a hinge point for the lifting drive device 60. The upper base frame 20 refers to the middle support structure hinged to the lower base frame 10. Specifically, it can be composed of two longitudinal beams welded to the first crossbar 22 and the second crossbar 23. The first crossbar 22 is located in front of the second crossbar 23, forming two independent hinge points to separate the installation positions of the moving drive device 70 and the lifting drive device 60. The movable frame 30 refers to the movable component arranged above the upper base frame 20. It slides back and forth via a sliding assembly, supporting the backrest assembly and transmitting the moving drive force. The sliding assembly refers to the mechanism that enables the movable frame 30 to slide relative to the upper base frame 20. Specifically, it is a combination of a linear track 81 fixed on the longitudinal beam and a sliding bar 82 at the bottom of the movable frame 30. The lifting drive device 60 refers to a linear actuator that drives the upper base frame 20 to rotate. Specifically, it can be an electric push rod, with its main body hinged to the third crossbar 12 and its telescopic end hinged to the second crossbar 23. The telescopic movement changes the tilt angle of the upper base frame 20. The backrest assembly refers to the linkage mechanism connecting the movable frame 30 and the upper base frame 20. When the movable frame 30 moves, it forces the backrest rod 41 to rotate around the hinge point, thus changing the backrest tilt angle. The footrest assembly refers to a folding mechanism containing multiple linkages, specifically using a cross-hinged third footrest link 53 and second footrest link 52. The swing of the first footrest link 51 drives the footrest component 55 to unfold or retract. The second linkage rod 90 refers to a rigid rod that laterally connects the two sets of footrest assemblies. Specifically, it can be a steel pipe with welded connecting plates at both ends, ensuring consistent movement of the footrests on both sides by synchronously transmitting driving force. The mobile drive device 70 refers to the linear actuator that drives the footrest assembly and the movable frame 30. Specifically, it can be an electric push rod, with its main body hinged to the first crossbar 22 and its telescopic end hinged to the middle of the second linkage rod 90. The push-pull action synchronously controls the unfolding of the footrest and the sliding of the movable frame 30.

[0025] Specifically, refer to Figure 2When the zero-wall-adjustment function needs to be adjusted, the moving drive device 70 pushes the second linkage rod 90, driving the first footrest connecting rod 51 of the two sets of footrest assemblies to swing synchronously, causing the third footrest connecting rod 53 to move in a cross motion with the second footrest connecting rod 52, so that the footrest 55 unfolds or retracts; at the same time, the movement of the second linkage rod 90 is transmitted to the movable frame 30 through a rigid connection, forcing the movable frame 30 to slide back and forth along the sliding assembly, thereby changing the backrest tilt angle through the backrest assembly. (Refer to...) Figure 3 When the zero-gravity tilt angle needs to be adjusted, the telescopic end of the lifting drive device 60 pushes the second crossbar 23, causing the upper base frame 20 to rotate around the rear hinge point, changing the overall tilt angle. At this time, the movable frame 30 maintains its relative position with the upper base frame 20 through the sliding component, and the backrest component does not move, realizing independent adjustment of the zero-gravity function. Since the moving drive device 70 and the lifting drive device 60 are respectively hinged to the first crossbar 22 and the third crossbar 12, their power transmission paths are independent of each other, so that the footrest unfolding and the backrest adjustment form a coordinated action, but the zero-gravity tilt angle adjustment is not affected.

[0026] Compared to existing technologies, traditional sofas use a single-layer frame structure, resulting in backrest adjustment and overall tilt adjustment sharing the same drive source, forcibly binding the functions. For example, when the electric push rod drives the frame to tilt, the backrest linkage is forced to move in tandem, and the user cannot control the backrest angle independently. This solution, however, uses a layered frame design, placing the zero-gravity tilt adjustment mechanism between the lower frame 10 and the upper frame 20, and the zero-wall-adjustment mechanism between the upper frame 20 and the movable frame 30, forming physically isolated drive paths. Furthermore, by hinged the two drive devices to different crossbars, mutual interference during power transmission is avoided, allowing the two functions to operate independently or coordinate through the linkage design of the movable drive device 70.

[0027] Through the above technical solution, this application achieves separate control of zero-gravity tilt angle adjustment and zero-wall-adhesion function. Users can adjust the overall tilt angle or backrest position independently according to their needs, avoiding the limitations of traditional sofa functions being tied together. The linkage design of the footrest unfolding and the 30° sliding of the movable frame saves on the number of drive components while ensuring the synchronization of the two movements, improving the smoothness of operation. The layered frame structure optimizes the spatial layout, allowing the sofa to adjust its functions without relying on wall support, adapting to the usage needs of small spaces.

[0028] This application further proposes that each backrest assembly includes a backrest rod 41 hinged to the movable frame 30, and a first linkage rod 42 hinged to both the upper base frame 20 and the backrest rod 41.

[0029] The backrest rod 41 is a rigid rod used to transmit the movement displacement of the movable frame 30 and drive the change of the backrest tilt angle. It can be made of metal tubing or high-strength engineering plastic. Its hinged design with the movable frame 30 allows the movable frame 30 to directly drive the backrest rod 41 to generate displacement when it moves back and forth. The first linkage rod 42 is a transmission component that connects the upper base frame 20 and the backrest rod 41. It can be connected by a pin hinge. Its two ends are connected to the fixed hinge point of the upper base frame 20 and the movable hinge point of the backrest rod 41, respectively, forming a constraint rod in the four-bar linkage mechanism. It is used to convert the linear motion of the movable frame 30 into the rotational motion of the backrest rod 41.

[0030] Specifically, when the movable frame 30 slides back and forth relative to the upper base frame 20, the backrest rod 41 is driven by the movable frame 30 to generate a horizontal displacement. At this time, the first linkage rod 42 forms a rotation fulcrum through its fixed hinge point with the upper base frame 20, forcing the backrest rod 41 to deflect at an angle around this fulcrum. Since the double hinge structure of the first linkage rod 42 forms a geometric constraint on the movement trajectory of the backrest rod 41, the linear displacement of the movable frame 30 is converted into the rotational motion of the backrest rod 41 around the hinge axis, thereby realizing the independent adjustment of the backrest tilt angle. In this process, the overall angle adjustment of the upper base frame 20 is independently controlled by the lifting drive device 60, and the two achieve motion decoupling through the layered hinge point design.

[0031] Compared to existing technologies, traditional sofa structures share the same drive source for backrest tilt adjustment and overall angle adjustment, requiring both to operate synchronously. For example, existing technologies directly change the backrest angle by tilting a single base frame, making it impossible to adjust the backrest tilt angle independently while keeping the overall base frame angle constant. This solution, however, separates the backrest adjustment module from the base frame adjustment module using a four-bar linkage, allowing users to choose to adjust only the backrest tilt angle or the overall angle as needed, eliminating the limitations imposed by this functional siloing.

[0032] Through the above technical solution, this application achieves independent control of backrest tilt angle adjustment and overall angle adjustment. Users can adjust the backrest tilt angle independently without changing the overall tilt angle of the sofa. For example, when the sofa is close to the wall, only the backrest angle needs to be finely adjusted to adapt to different sitting postures, while avoiding the interference problem between the backrest and the wall caused by traditional linkage adjustment. This solution uses a four-bar linkage mechanism to convert the linear motion of the movable frame 30 into a precise rotational angle output, ensuring the stability and reliability of the backrest adjustment process.

[0033] This application further proposes that each footrest assembly includes a first footrest link 51 and a second footrest link 52 hinged to the movable frame 30, a third footrest link 53 hinged to the first footrest link 51, a fourth footrest link 54 hinged to the second footrest link 52, and a footrest member with one end and the middle portion respectively hinged to the third footrest link 53 and the fourth footrest link 54; the third footrest link 53 and the second footrest link 52 are cross-hinged; the first footrest link 51 is used as the power input end of the footrest assembly, and the two ends of the second linkage 90 are respectively connected to the first footrest link 51 of the two footrest assemblies.

[0034] The first footrest link 51 is a basic transmission component that forms a rotatable connection with the movable frame 30. Specifically, it can be implemented by connecting a metal rod to the movable frame via a pivot shaft, serving as a power input end to transmit driving force to the footrest assembly. The second footrest link 52 is an auxiliary transmission component that forms a rotatable connection with the movable frame. Specifically, it can be implemented by connecting a metal rod to the movable frame via a pivot shaft, forming a cross-hinged structure with the third footrest link 53. The third footrest link 53 is an extended transmission component hinged to the first footrest link 51. Specifically, it can be implemented by connecting a metal rod to the first footrest link 51 via a pivot shaft; its cross-hinged structure enhances the stability of the footrest when deployed. The fourth footrest link 54 is an extended transmission component hinged to the second footrest link 52. Specifically, it can be implemented by connecting a metal rod to the second footrest link 52 via a pivot shaft, supporting the movement trajectory of the footrest component. The footrest component 55 is a support component that bears the human foot. Specifically, it can be implemented using a composite structure of a metal frame and soft materials, achieving posture adjustment through multi-point hinges. Cross hinge refers to a structure in which two rods are rotatably connected in the middle. Specifically, it can be achieved by using a pivot shaft that passes through the middle of the two rods, which can improve the rigidity of the linkage structure.

[0035] Specifically, when the moving drive device 70 pushes the second linkage rod 90, the first foot support connecting rods 51 of the two foot support assemblies rotate synchronously, driving the third foot support connecting rod 53 to rotate around the hinge point. Since the third foot support connecting rod 53 and the second foot support connecting rod 52 form a cross-hinged structure, the rotational movement of the second foot support connecting rod 52 is constrained to form a linkage relationship with the third foot support connecting rod 53, thereby driving the fourth foot support connecting rod 54 to cause the foot support to unfold or retract. The cross-hinged structure makes the third foot support connecting rod 53 and the second foot support connecting rod 52 form a stable four-bar linkage mechanism, which can prevent the foot support from shifting during unfolding.

[0036] Through the above technical solution, this application achieves the synchronization and stability of the footrest assembly's unfolding action, solves the problem of jamming caused by the asynchronous unfolding of traditional sofa footrests, and enhances the load-bearing capacity of the footrest components through the cross-hinged structure, avoiding structural deformation caused by uneven force.

[0037] This application further proposes that the second linkage 90 and the first foot support linkage 51 are rigidly connected.

[0038] Rigid connection refers to the connection between two components through a non-deformable fixing method, which can be achieved by welding, integral molding, or bolt fastening. This connection method can eliminate relative displacement between components. The first foot support connecting rod 51 serves as the power input end of the foot support assembly and can be made of metal rods or high-strength composite materials. Its rigid connection with the second linkage rod 90 allows the driving force to be directly transmitted to the two sets of foot support assemblies.

[0039] Specifically, the driving force of the moving drive device 70 is simultaneously applied to the first footrest link 51 of both footrest assemblies via the second linkage 90. Since there is no elastic deformation or gap between the second linkage 90 and the first footrest link 51, the driving force does not attenuate or delay during transmission, thus ensuring that the unfolding angle and movement trajectory of the two footrest assemblies are completely consistent. When the footrest assembly is subjected to dynamic loads, the rigid connection structure can resist torsional and shear forces, avoiding mechanical failure caused by uneven stress.

[0040] Through the above technical solution, this application solves the problem of asynchronous movement of the footrest assembly due to unstable power transmission, and at the same time enhances the torsional strength of the linkage mechanism to ensure the reliability and stability of the footrest's unfolding and retracting movements.

[0041] This application further proposes a sliding assembly including a track 81 fixed on the upper base frame 20 and extending in the front-rear direction, and a slider 82 fixed on the movable frame 30 and slidingly engaged with the track 81.

[0042] Here, track 81 refers to a linear guide structure fixed on the upper base frame 20, which can be implemented using metal profiles. Its layout extending in the front-to-back direction provides a sliding reference for the movable frame 30. Slide bar 82 refers to a rigid component that forms a sliding engagement with track 81. It can be implemented using a metal strip or a composite material strip with a wear-resistant coating on its surface. It is fixed on the movable frame 30 and forms a sliding constraint with the contact surface of track 81.

[0043] Specifically, the track 81 is rigidly fixed to the surface of the upper base frame 20, and its extension direction is consistent with the required movement direction of the movable frame 30, ensuring that the movable frame 30 can only slide along a preset path. The contact surface between the slider 82 and the track 81 forms a sliding fit through a planar contact method, restricting the vertical displacement freedom of the movable frame 30. When the movable frame 30 moves, the slider 82 slides along the surface of the track 81, and the track 81 rigidly blocks the lateral displacement of the slider 82, preventing the movable frame 30 from swaying laterally during movement. The fixed connection between the track 81 and the slider 82 does not rely on additional components such as rollers or bearings, simplifying the overall structure of the sliding assembly and reducing motion errors caused by component gaps.

[0044] Through the above technical solution, this application can ensure that the movable frame 30 maintains a stable sliding trajectory during the forward and backward movement, avoids backrest tilt angle adjustment failure or footrest unfolding action jam due to movement deviation, and provides a reliable support foundation for the coordinated operation of the backrest assembly and footrest assembly.

[0045] This application further proposes to provide support rods 11 on both sides of the rear end of the lower base frame 10, and to hinge the rear ends of the upper base frame 20 to the corresponding support rods 11.

[0046] The support rod 11 refers to a rod-shaped structure vertically fixed to both sides of the rear end of the lower base frame 10. It is specifically constructed by welding metal tubing or profiles and serves to provide a rotation fulcrum for the upper base frame 20 and transmit supporting force. The hinge refers to the connection between the two components via a pin or hinge. Specifically, it can be implemented using a rotating shaft structure with bearings, allowing the upper base frame 20 to rotate around the hinge point of the support rod 11.

[0047] Specifically, the support rods 11 on both sides of the rear end of the lower base frame 10 are symmetrically arranged to form a stable rotation fulcrum structure. The rear ends of the upper base frame 20 are connected to the support rods 11 by hinges, allowing the upper base frame 20 to be tilted around this fulcrum. During the zero-gravity function adjustment, the lifting drive device 60 drives the upper base frame 20 to rotate around this hinge point. The support rods 11 distribute the load through the symmetrically arranged support points, avoiding frame displacement caused by unilateral force. This structure separates the rotation center of the zero-gravity tilt adjustment from the backrest movement mechanism required for the zero-wall-adhesion function, allowing the drive systems of the two functions to operate independently, achieving functional decoupling control.

[0048] Through the above technical solution, this application achieves the physical separation of zero-gravity tilt angle adjustment and zero-wall-adhesion function, allowing the two functions to be controlled independently. The symmetrical arrangement of the support rods 11 improves the stability of the upper base frame 20 during rotation adjustment, avoiding tilting or jamming of the frame due to insufficient support on one side, and at the same time provides a separate installation foundation for the independent drive mechanisms of different functional modules.

[0049] This application further proposes that the upper base frame 20 has a downwardly extending support foot 21 at its front end.

[0050] The support leg 21 is a structural component fixed to the front end of the upper base frame 20 and extending downwards. It can be made of metal or high-strength plastic, and its bottom end contacts the lower base frame 10 to form a support point. The support leg 21 is fixed to the front end of the upper base frame 20 by a rigid connection, and is used to provide front-end support for the load generated by the unfolding of the movable frame 30 and the foot support assembly when the upper base frame 20 is rotated around the rear hinge point to adjust the zero-gravity tilt angle.

[0051] Specifically, the support foot 21 is positioned at the front end of the upper base frame 20, forming a symmetrical support structure with the support rod 11 at the rear end of the lower base frame 10. When the upper base frame 20 is not adjusted for zero gravity tilt, the support foot 21 provides support, sharing the load during the sliding of the movable frame 30 and the unfolding of the foot support assembly. Thus, the lateral load generated during the forward and backward sliding of the movable frame 30 is transferred to the lower base frame 10 through the support foot 21, preventing deformation or swaying of the front end of the upper base frame 20 due to lack of support.

[0052] Through the above technical solution, this application can effectively suppress the sinking or displacement of the front end of the upper base frame 20 during the functional adjustment process, and avoid the backrest tilt angle and footrest unfolding action jamming caused by local deformation, thereby ensuring the structural stability when the zero wall-mounted and zero gravity functions are independently adjusted. The contact support between the support leg 21 and the lower base frame 10 further disperses the lateral load generated by the sliding of the movable frame 30, reducing the risk of wear caused by the concentration of force at the hinge point.

[0053] This application further proposes that the first crossbar 22 is arranged in front of the second crossbar 23.

[0054] The first crossbar 22 is a lateral support member located in the front region of the upper base frame 20, used to provide a hinge support point for the moving drive device 70. Its frontal arrangement spatially separates the working area of ​​the moving drive device 70 from the rear-mounted lifting drive device 60. The second crossbar 23 is a lateral support member located in the rear region of the upper base frame 20, used to withstand the thrust of the lifting drive device 60. Its staggered arrangement with the first crossbar 22 forms a layered force transmission structure.

[0055] Specifically, the main body of the moving drive device 70 is hinged to the first crossbar 22, and its drive end is connected to the second linkage rod 90 to form a front drive unit; the drive end of the lifting drive device 60 is hinged to the second crossbar 23 to form a rear drive unit. The front drive unit and the rear drive unit are spatially isolated by the front and rear distribution of the first crossbar 22 and the second crossbar 23, and the extension and retraction trajectories of the two sets of drive devices do not intersect. When the moving drive device 70 pushes the second linkage rod 90, the horizontal thrust generated by the front drive unit only acts on the footrest assembly unfolding mechanism and the movable frame 30; when the lifting drive device 60 pushes the second crossbar 23, the tilting thrust generated by the rear drive unit only acts on the upper base frame 20 rotation mechanism. The force transmission paths of the two sets of drive devices form a height difference in the vertical direction and a front-to-back distance in the horizontal direction.

[0056] Compared with the prior art, this solution separates the working planes of the two sets of drive devices by using a front and rear crossbar layout. The pushing and pulling action plane of the moving drive device 70 is located on the horizontal plane of the front crossbar, and the tilting action plane of the lifting drive device 60 is located on the tilting plane of the rear crossbar. The two sets of planes form a non-coplanar state.

[0057] Through the above technical solution, this application effectively eliminates the risk of mechanical interference when the two sets of drive devices work synchronously. The mobile drive device 70’s control over the unfolding of the footrest assembly and the lifting drive device 60’s control over the adjustment of the backrest tilt angle form a physically isolated operating system. The operation response delay is reduced to a negligible level, and the user can independently perform zero-gravity angle adjustment and footrest unfolding actions without worrying about functional conflicts.

[0058] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A functional base for a wall-mounted sofa, characterized in that, include: The lower base frame (10) is equipped with a third crossbar (12); The upper base frame (20) is hinged to the lower base frame (10) at its rear end, and the upper base frame (20) also has a first crossbar (22) and a second crossbar (23). The movable frame (30) and the sliding assembly, wherein the movable frame (30) is disposed above the upper base frame (20) in a way that allows it to move back and forth via the sliding assembly; The lifting drive device (60) has its main body hinged to the third crossbar (12) and its drive end hinged to the second crossbar (23), and is used to drive the upper base frame (20) to rotate around the hinge point to adjust the zero gravity tilt angle; Two sets of backrest assemblies, each set of backrest assemblies is connected between the movable frame (30) and the upper base frame (20), and is used to change the backrest tilt angle as the movable frame (30) moves; Two sets of footrest assemblies, each set of footrest assemblies being connected to the movable frame (30), are movable between an extended position and a retracted position; The second linkage rod (90) has its two ends connected to the power input ends of the two sets of footrest assemblies respectively; The mobile drive device (70) has its main body hinged to the first crossbar (22) and its drive end hinged to the second linkage rod (90), which is used to drive the footrest assembly to unfold or retract, and to drive the movable frame (30) to slide back and forth relative to the upper base frame (20).

2. The functional base for a wall-mounted sofa according to claim 1, characterized in that: Each of the backrest assemblies includes a backrest rod (41) hinged to the movable frame (30), and a first linkage rod (42) hinged to both the upper base frame (20) and the backrest rod (41).

3. The functional base for a wall-mounted sofa according to claim 1, characterized in that: Each set of footrest assemblies includes a first footrest link (51) and a second footrest link (52) hinged to the movable frame (30), a third footrest link (53) hinged to the first footrest link (51), a fourth footrest link (54) hinged to the second footrest link (52), and a footrest member (55) with one end and the middle part respectively hinged to the third footrest link and the fourth footrest link (54), wherein the third footrest link (53) and the second footrest link (52) are cross-hinged; the first footrest link (51) is used as the power input end of the footrest assembly, and the two ends of the second linkage rod (90) are respectively connected to the first footrest link (51) of the two sets of footrest assemblies.

4. A functional base for a wall-mounted sofa according to claim 3, characterized in that: The second linkage rod (90) is rigidly connected to the first foot support linkage rod (51).

5. A functional base for a wall-mounted sofa according to claim 1, characterized in that: The sliding assembly includes: a track (81) fixed on the upper base frame (20) and extending in the front-rear direction, and a slide bar (82) fixed on the movable frame (30) and slidingly engaged with the track (81).

6. A functional base for a wall-mounted sofa according to claim 1, characterized in that: The lower base frame (10) is provided with support rods (11) arranged on both sides of the rear end of the lower base frame (10), and the rear ends of the upper base frame (20) are respectively hinged to the two support rods (11).

7. A functional base for a wall-mounted sofa according to claim 1, characterized in that: The upper base frame (20) is provided with a downwardly extending support foot (21) at its front end.

8. A functional base for a wall-mounted sofa according to claim 1, characterized in that: The first crossbar (22) is arranged in front of the second crossbar (23).

9. A functional base for a wall-mounted sofa according to claim 1, characterized in that: The lifting drive device (60) and the moving drive device (70) are electric push rods.

10. A functional base for a wall-mounted sofa according to claim 5, characterized in that: The contact surfaces between the slider (82) and the track (81) form a sliding fit through a planar bonding method.

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