Sofa framework device

Abstract

The utility model provides a sofa framework device. The sofa framework device comprises a base assembly and a leg support assembly arranged on the base assembly, the base assembly comprises a base frame, a right-angle seat plate support is fixed to the top of the base frame, a seat plate is fixed to the upper portion of the seat plate support, and an arc-shaped rail is fixed to the lower portion of the seat plate. The leg support assembly comprises a fixing plate fixed to the base frame and a base motor fixed to the lower portion of the fixing plate, a leg support is arranged at the output end of the base motor, a rolling piece is arranged on the leg support and connected with the arc-shaped rail in a rolling mode, and the leg support is driven by the base motor to rotate. According to the sofa framework device, the arc-shaped track with a key guiding function is directly fixed below the seat plate and depends on the firm seat plate bracket and the base frame, so that the overall rigidity and deformation resistance of a leg support supporting system are greatly enhanced.

Description

Technical Field

[0001] This utility model relates to the field of sofa frame technology, specifically to a sofa frame device. Background Technology

[0002] In existing sofa frames, adjusting the angle of the leg rest or backrest is already quite common. However, traditional angle adjustment mechanisms, especially leg rest mechanisms, often suffer from insufficient stability during the adjustment process and after positioning. Some solutions using cylinders or direct-drive motors can provide driving force, but the direction of the thrust often deviates from the tangent of the leg rest's rotation arc. The force transmission path is not direct, easily generating lateral components or torques. This not only exacerbates the wear of moving parts but also causes the leg rest to vibrate and jam during adjustment, and makes it difficult to lock precisely at the target angle, failing to meet the stringent requirements of high-end chairs for smooth, quiet, and reliable adjustment. Utility Model Content

[0003] This invention proposes a sofa frame device that solves the problem of instability in existing sofa frames during angle adjustment due to the lack of an effective balancing mechanism.

[0004] The technical solution of this utility model is implemented as follows:

[0005] A sofa frame device includes a base assembly and a leg support assembly disposed on the base assembly, wherein a backrest assembly is also disposed on the back of the base assembly.

[0006] The base assembly includes a base frame, a right-angled seat plate bracket fixed to the top of the base frame, a seat plate fixed above the seat plate bracket, and an arc-shaped track fixed below the seat plate.

[0007] The leg support assembly includes a fixed plate fixed to the base frame and a base motor fixed below it. The output end of the base motor is provided with a leg support, and the leg support is provided with a rolling element. The rolling element is tactilely connected to the arc-shaped track. The leg support rotates by being driven by the base motor.

[0008] Furthermore, the rolling element is a roller, wherein the roller is a frustum, and the smaller circular surface of the frustum is located inward.

[0009] Furthermore, the rolling element is a soft roller.

[0010] Furthermore, the output end of the base motor is fixed with a base motor connecting rod extending above the fixed plate, and a rotating plate located below the seat plate is fixed to the outside of the base motor connecting rod, wherein the leg support is set on the rotating plate and one side extends out from the right angle inside the seat plate bracket.

[0011] Furthermore, the leg support includes at least two support arms fixed to the top of the rotating plate and a support plate disposed at the end of the support arms; wherein the side of the support arm corresponding to the support plate is curved upward.

[0012] Furthermore, the base motor connecting rod is also fixed with leg support angle adjusters that are fixed to the rotating plate and the fixed plate respectively at the top and bottom.

[0013] Furthermore, the backrest assembly includes a backrest bracket fixed to the back of the base frame, and right-angle connecting plates are provided on both sides of the backrest bracket. A backrest adjustment plate is rotatably connected to the opposite side of the two right-angle connecting plates.

[0014] Furthermore, a backrest angle adjuster is provided between the right-angle connecting plate and the backrest adjustment plate, and a backrest angle adjuster connecting rod is connected through two adjacent backrest angle adjusters. The backrest angle adjuster connecting rod is provided with a backrest motor whose output end is connected to the outside.

[0015] Furthermore, connecting plates a and b are respectively provided on both sides of the backrest angle adjuster connecting rod, and connecting plates a and b are respectively set on the right-angle connecting plate and the backrest adjustment plate.

[0016] Furthermore, it also includes a sliding assembly, which consists of two sets of electric sliding tables, respectively fixed on both sides of the base frame.

[0017] The beneficial effects of the technical solution provided in this application are as follows:

[0018] 1. This sofa frame device directly drives the leg rest to rotate via a base motor. This, combined with the precise rolling connection of the rolling elements on the leg rest within a fixed arc-shaped track beneath the seat, achieves efficient tangential transmission of the driving torque along the rotation arc of the leg rest. This design completely eliminates the harmful lateral forces and additional torques caused by the misalignment of the thrust direction with the rotation tangent in traditional direct-push or cylinder-driven systems. This effectively prevents shaking and jamming during the extension / retraction of the leg rest, ensuring exceptionally smooth and stable angle adjustment.

[0019] 2. This sofa frame device directly fixes the arc-shaped track, which carries the key guiding function, under the seat board and relies on the sturdy seat board support and base frame, greatly enhancing the overall rigidity and deformation resistance of the leg support system. At the same time, this integrated design, such as motor-driven rotation and rolling track guidance, can achieve a compact structure and a clear and direct force transmission path, avoiding the accumulation of gaps and potential failure points caused by complex linkage or sliding mechanism. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the sofa frame device of this utility model;

[0022] Figure 2 This is an exploded view of the sofa frame device of this utility model;

[0023] Figure 3 This is an exploded view of the base assembly and sliding assembly of this utility model;

[0024] Figure 4 This is an exploded view of the backrest assembly of this utility model;

[0025] Figure 5 This is an exploded view of the leg support assembly of this utility model.

[0026] In the diagram: 10 Base assembly, 11 Base frame, 12 Seat plate bracket, 13 Seat plate, 14 Arc track; 20, 21 Backrest bracket, 22 Right angle connecting plate, 23 Connecting plate a, 24 Backrest angle adjuster, 25 Connecting plate b, 26 Backrest adjustment plate, 27 Backrest angle adjuster connecting rod, 28 Backrest motor, 29 Connecting arm; 30; 40 Leg support assembly, 41 Fixing plate, 42 Base motor, 43 Motor connecting rod, 44 Leg support angle adjuster, 45 Rotating plate, 46 Support arm, 47 Support plate, 48 Rolling element. Detailed Implementation

[0027] The technical solution of this utility model will be clearly and completely described below with reference to its embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0028] Reference Figure 1-5This embodiment provides a sofa frame device, including a base assembly 10 and a leg support assembly 40 disposed on the base assembly 10. A backrest assembly 20 is also provided on the back of the base assembly 10. The base assembly 10 includes a base frame 11, with a right-angled seat support 12 fixed to the top of the base frame 11. A seat plate 13 is fixed above the seat support 12, and an arc-shaped track 14 is fixed below the seat plate 13. The leg support assembly 40 includes a fixing plate 41 fixed to the base frame 11 and a base motor 42 fixed below it. The output end of the base motor 42 is provided with a leg support, and a rolling element 48 is provided on the leg support. The rolling element 48 is tactilely connected to the arc-shaped track 14, and the leg support rotates under the drive of the base motor 42. The core improvement lies in the precise rolling connection formed by the rolling element 43 on the leg support assembly 40 and the arc-shaped track 14 fixed below the seat plate 13 in the base assembly 10. The main function of this design is to provide precise, low-friction, rigid guidance and support for the rotational movement of the leg support 42. When the base motor 44 drives the leg support 42 to rotate around its output end, the rolling element 43 is forced to roll within a specific curved path of the arc track 14. Its core function is to completely eliminate the radial degree of freedom and potential lateral offset during the movement of the leg support 42, ensure the stability of the rotation axis, and efficiently and directly convert the driving force into pure rotation along a predetermined arc trajectory. After the base motor 44 starts, its output torque acts directly on the leg support 42, causing it to rotate. At the same time, the rolling element 43 fixed on the leg support 42 immediately comes into contact with the curved surface of the arc track 14 and generates an interaction force. Since the center of curvature of the arc track 14 is adapted to the ideal center of rotation of the leg support 42 (or its kinematic equivalence is ensured by design), the rolling motion of the rolling element 43 within the track 14 naturally forces the leg support 42 to strictly follow the arc path. During this process, the track 14 bears the normal force and possible lateral force generated by the rotation of the leg rest 42 and the load on it (such as the passenger's legs). Through its own rigidity and fixed connection with the seat plate 13 / seat plate bracket 12, it effectively transmits and distributes these forces to the base frame 11, thereby achieving smooth, jam-free and precise positioning of the rotational movement of the leg rest 42, fundamentally solving the stability problem caused by the deviation of the thrust direction.

[0029] To actively adapt to and compensate for the difference in linear velocity between the inner and outer ends of the leg support 42 due to their different revolution radii during rotation, the rolling element 48 is a roller, specifically a frustum of a cone with its smaller circular surface located inwards. This conical structure allows the working radius of the contact point between the roller 48 and the arc-shaped track 14 to adapt to the smaller contact radius on the inner side near the rotation center or the larger contact radius on the outer side far from the rotation center. This ensures that when the roller 48 rolls on the track 14, the linear velocities of its inner and outer contact points precisely match the revolution linear velocities required for their respective positions, fundamentally eliminating sliding friction, wear, and unstable movement caused by forced velocity differences. When the leg support 42 is driven to rotate around its axis by the base motor 44, the frustum-shaped roller 48 fixed on the leg support 42 rolls within the arc-shaped track 14. Because the roller 48 itself has a radial dimensional gradient with a small radius at the small end and a large radius at the large end, the contact point located on the inner side near the rotation center has a smaller effective rolling radius, while the contact point located on the outer side far from the rotation center has a larger effective rolling radius. According to the linear velocity formula v = ω (where ω is the angular velocity of the roller's rotation and r is the rolling radius of the contact point). When the roller 48 rotates at a single angular velocity ω, the linear velocity vinner of the inner contact point is naturally less than the linear velocity vouter of the outer contact point. By precisely designing the taper of the roller 48 and its installation direction with the small end facing inward, vinner is made exactly equal to the low speed required for the inner point's revolution, and vouter is exactly equal to the high speed required for the outer point's revolution. This achieves pure rolling across the entire contact surface between the roller 48 and the track 14, avoiding harmful slippage and ensuring extremely smooth and stable rotation of the leg support 42.

[0030] In another embodiment, the rolling element 48 is a soft roller. By utilizing the elastic deformation characteristics of the roller material under pressure, the effective rolling radius of its contact point with the arc-shaped track 14 is dynamically adjusted. This adaptive deformation causes the soft roller 48 to generate a smaller rolling radius on the inner side with a smaller revolution radius and a larger rolling radius on the outer side with a larger revolution radius, thereby passively matching the different linear velocity requirements of the inner and outer ends when the leg support 42 rotates, eliminating forced slippage caused by the speed difference.

[0031] Furthermore, the output end of the base motor 42 is fixed with a base motor connecting rod 43 extending above the fixed plate 41. A rotating plate 45 located below the seat plate 13 is fixed to the outside of the base motor connecting rod 43. The leg support is mounted on the rotating plate 45, with one side extending from the right-angled inner side of the seat plate bracket 12. The output torque of the base motor 44 is transmitted to the rotating plate 45 above the fixed plate 41 via the base motor connecting rod 43. The base motor connecting rod 43 spans the installation height of the fixed plate 41, ensuring that the torque of the motor 44 can be effectively transmitted to the operating space below the seat plate 13. The rotating plate 45, as a rigid carrier, integrates the leg support 42 and the rolling element 48 into a single motion unit, and its planar structure disperses the bending moment of the leg support load on the motor shaft 43. The leg support 42 extends from the right-angled inner side of the seat plate bracket 12, fully utilizing the redundant space in the right-angled area of ​​the frame and avoiding motion interference with the seat plate 13 or the bracket 12.

[0032] The leg rest includes at least two support arms 46 fixed to the top of the rotating plate 45. The symmetrical arrangement of the two support arms 46 converts the load torque into pressure on the rotating plate 45, avoiding unilateral torsional loads and ensuring the stable and unbiased movement trajectory of the rolling element 48 within the arc-shaped track 14. A support plate 47 is located at the end of the support arms 46; the extended contact surface between the support plate 47 and the support arms 46 avoids stress concentration at a single point, improving long-term reliability. The support arm 46 curves upwards on the side corresponding to the support plate 47. This upward curve at the end of the support arm 46 naturally creates a front-high, rear-low angle for the support plate 47, conforming to the leg curve and preventing the legs from slipping during seating. The curved section of the support arm 46 contacts the passenger's legs first, and its inclined surface generates a horizontal rearward component force through the decomposition of normal support force, counteracting the forward slipping tendency of the legs.

[0033] In addition, the base motor connecting rod 43 is also fixed with a leg rest adjuster 44, which is fixed to the upper and lower parts of the rotating plate 45 and the fixed plate 41 respectively. The leg rest adjuster 44 converts the rotational motion output by the motor 42 into a self-locking incremental adjustment, ensuring that the leg rest achieves rigid positioning with zero backlash at any target angle; the adjuster housing acts as a force-bearing frame, directly transmitting the overturning moment generated by the leg rest load to the fixed plate 41, forming a force flow path independent of the motor 42, and preventing the connecting rod 43 from bearing lateral shear force.

[0034] To ensure structural stability and load-bearing capacity during adjustment, the backrest assembly 20 includes a backrest bracket 21 fixed to the back of the base frame 11. Right-angle connecting plates 22 are provided on both sides of the backrest bracket 21, and backrest adjustment plates 26 are rotatably connected to opposite sides of the two right-angle connecting plates 22. The rigid support of the right-angle connecting plates 22 and the rotatable design of the backrest adjustment plates 26 provide a stable mounting base and flexible angle adjustment capability for the backrest. When the backrest needs to be adjusted, the backrest adjustment plate 26 rotates around its rotatable connection point with the right-angle connecting plate 22, driving the entire backrest to move. The rigid design of the right-angle connecting plate 22 transfers the backrest load to the backrest bracket 21 and the base frame 11, ensuring no structural deformation or loosening during adjustment.

[0035] Furthermore, a backrest angle adjuster 24 is provided between the right-angle connecting plate 22 and the backrest adjustment plate 26. A backrest angle adjuster connecting rod 27 is connected through two adjacent backrest angle adjusters 24. The backrest angle adjuster connecting rod 27 is provided with a backrest motor 28 whose output end is connected to the outside. Through the centralized control method driven by the motor, it is ensured that the backrest adjustment plates 26 on both sides rotate synchronously, eliminating the structural tilt caused by unilateral force. At the same time, the angle adjuster 24 provides precise angle positioning and self-locking function, so that the backrest can be stably maintained in any position, meeting the comfort needs of different sitting postures. When the backrest motor 28 starts, its output torque is transmitted to the backrest angle adjusters 24 on both sides through the backrest angle adjuster connecting rod 27, driving the backrest adjustment plate 26 to rotate around the rotation point of the right angle connecting plate 22; the reduction mechanism inside the angle adjuster 24 converts the high-speed rotation of the motor into low-speed high-torque output, ensuring smooth backrest movement, and fixing the angle through the self-locking mechanism after the motor stops, while the rigid connection of the connecting rod 27 forces the angle adjusters 24 on both sides to move synchronously, avoiding backrest twisting or jamming due to asymmetrical load.

[0036] To ensure that the output torque of the angle adjuster 24 is evenly applied to the rotation fulcrum of the backrest adjustment plate 26, eliminating uneven loading or jamming caused by single-point force, connecting plates a23 and b25 are respectively provided on both sides of the connecting rod 27 of the backrest angle adjuster. Connecting plates a23 and b25 are respectively mounted on the right-angle connecting plate 22 and the backrest adjustment plate 26. Through the transition connection of connecting plates a23 and b25, the driving force of the angle adjuster 24 is evenly distributed to the entire contact surface of the backrest adjustment plate 26, while simultaneously enhancing the structural stability between the connecting rod 27 and the rotating components, avoiding deformation or wear caused by localized stress concentration, and ensuring the integrity and synchronization of the backrest angle adjustment process. Connecting plate a23 transmits torque from the connecting rod 27 to the right-angle connecting plate 22, while connecting plate b25 further transmits power to the backrest adjustment plate 26, forming a complete force flow path.

[0037] To enhance the seat's ability to meet the needs of different occupants, a sliding assembly 30 is also included. This sliding assembly consists of two sets of electric slides, each fixed to one side of the base frame 11. The precise linear drive of the electric slides enables the entire seat to move smoothly and synchronously left and right, ensuring the stability and safety of the seat structure during movement. Simultaneously, the closed-loop control characteristics of the electric slides allow for stepless positioning, improving seating comfort and ease of operation.

[0038] In order to reduce the shaking of the two backrest adjustment plates 26 during the adjustment process, a connecting arm 29 is fixedly installed between the two adjacent backrest adjustment plates 26. The connecting arm 29 fixes the two backrest adjustment plates 26 to each other to form a relatively whole, thereby ensuring that the two will not deviate or shake during the adjustment process.

[0039] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A sofa frame device, characterized in that, Includes a base assembly (10) and a leg support assembly (40) disposed on the base assembly (10), wherein a backrest assembly (20) is also disposed on the back of the base assembly (10). The base assembly (10) includes a base frame (11), a right-angled seat plate bracket (12) is fixed to the top of the base frame (11), a seat plate (13) is fixed above the seat plate bracket (12), and an arc-shaped track (14) is fixed below the seat plate (13). The leg support assembly (40) includes a fixing plate (41) fixed on the base frame (11) and a base motor (42) fixed below it. The output end of the base motor (42) is provided with a leg support, and a rolling element (48) is provided on the leg support. The rolling element (48) is tactilely connected to the arc track (14). The leg support rotates by being driven by the base motor (42).

2. The sofa frame device as described in claim 1, characterized in that, The rolling element (48) is a roller, wherein the roller is a frustum, and the small circular surface of the frustum is located inside.

3. The sofa frame device as described in claim 1, characterized in that, The rolling element (48) is a soft roller.

4. The sofa frame device as described in claim 1, characterized in that, The output end of the base motor (42) is fixed with a base motor connecting rod (43) extending above the fixed plate (41). The outside of the base motor connecting rod (43) is fixed with a rotating plate (45) located below the seat plate (13). The leg support is set on the rotating plate (45) and one side extends out from the right angle inside the seat plate bracket (12).

5. The sofa frame device as described in claim 4, characterized in that, The leg support includes at least two support arms (46) fixed to the top of the rotating plate (45) and a support plate (47) located at the end of the support arms (46); wherein the support arm (46) is tilted upward on the side corresponding to the support plate (47).

6. The sofa frame device as described in claim 4, characterized in that, The base motor connecting rod (43) is also fixed with a leg support angle adjuster (44) which is fixed to the rotating plate (45) and the fixed plate (41) respectively.

7. The sofa frame device as described in claim 1, characterized in that, The backrest assembly (20) includes a backrest bracket (21) fixed to the back of the base frame (11). Right-angle connecting plates (22) are provided on both sides of the backrest bracket (21), and backrest adjustment plates (26) are rotatably connected to the opposite side of the two right-angle connecting plates (22).

8. The sofa frame device as described in claim 7, characterized in that, A backrest angle adjuster (24) is provided between the right-angle connecting plate (22) and the backrest adjustment plate (26). A backrest angle adjuster connecting rod (27) is connected through two adjacent backrest angle adjusters (24). A backrest motor (28) with an output end connected to the outside is provided on the backrest angle adjuster connecting rod (27).

9. The sofa frame device as described in claim 8, characterized in that, The backrest angle adjuster connecting rod (27) has a connecting plate a (23) and a connecting plate b (25) on both sides respectively. The connecting plate a (23) and the connecting plate b (25) are respectively set on the right angle connecting plate (22) and the backrest adjustment plate (26).

10. The sofa frame device as described in claim 1, characterized in that, It also includes a sliding assembly (30), which consists of two sets of electric slides, and is fixed on both sides of the base frame (11).

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