A direct-drive linkage mechanism for an electric sofa leg rest

Abstract

This invention provides a direct-drive linkage mechanism for an electric sofa leg rest. The mechanism includes a sofa frame and a leg rest mechanism, with the leg rest mechanism fixedly connected to the sofa frame. The sofa frame includes a seat cushion frame, a motor, and a concentric bearing. The seat cushion frame is fixedly connected to the sofa frame, the motor is fixedly connected to the seat cushion frame, and the concentric bearing is fixedly connected to the seat cushion frame. The leg rest mechanism includes a first link, a second link, a third link, a fourth link, a fifth link, a sixth link, and a seventh link. A cylindrical pin is fixedly mounted in the middle of the second link, and a rotating plate is fixedly mounted on the sixth link, with the lower side of the rotating plate abutting against the cylindrical pin. This invention, through a novel structural design using concentric bearings and a motor drive, achieves individual adjustment of the sofa leg rest and a design improvement that eliminates hard objects under the seat cushion frame, thereby improving user comfort and meeting the need for independent backrest adjustment.

Description

Technical Field

[0001] This invention relates to the field of furniture sofa and chair technology, specifically to a direct drive linkage mechanism for a sofa leg support frame. Background Technology

[0002] In the application of electric drive mechanisms in home sofa backrests, functional and spatial layout issues must be considered. This is because mainstream electric leg support mechanisms share a single motor with the backrest linkage, located under the seat frame. This motor is easily impacted by users during daily use, necessitating a reinforced seat cushion for its protection. This approach fails to adequately consider user comfort and the requirement for independent leg support adjustment, leading to complaints about the firmness and functionality of traditional electric sofas after a period of use. This invention, within the same sofa application environment, utilizes a novel structural design with a concentric mechanism. A small motor is positioned at the edge of the seat frame for direct leg support drive, enabling independent leg support adjustment and eliminating hard objects under the seat cushion frame. This improves user comfort and fulfills the need for independent leg support adjustment. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, the present invention provides a direct drive linkage mechanism for an electric sofa leg rest.

[0004] The technical solution of the present invention is as follows:

[0005] A direct-drive linkage mechanism for an electric leg rest on a sofa includes a sofa frame and a leg rest mechanism. The leg rest mechanism is fixedly connected to the sofa frame. The sofa frame includes a seat cushion frame, a motor, and a concentric bearing. The seat cushion frame is fixedly connected to the sofa frame, the motor is fixedly connected to the seat cushion frame, and the concentric bearing is fixedly connected to the seat cushion frame. The leg rest mechanism includes a first link, a second link, a third link, a fourth link, a fifth link, a sixth link, and a seventh link. One end of the first link is fixedly connected to the concentric bearing. The other end of the first link is rotatably connected to one end of the second link. One end of the second link is rotatably connected to one end of the third link. The middle of the third link is rotatably connected to one end of the fourth link. The other end of the fourth link is rotatably connected to one end of the fifth link. The middle of the fifth link is rotatably connected to one end of the second link. The other end of the fifth link is rotatably connected to one end of the sixth link. The middle of the sixth link is rotatably connected to the middle of the first link. The other end of the sixth link is rotatably connected to one end of the seventh link. The other end of the seventh link is rotatably connected to the seat cushion frame.

[0006] Furthermore, a cylindrical pin is fixed in the middle of the second connecting rod.

[0007] Furthermore, the sixth link is fixed with a rotating plate, and the lower side of the rotating plate abuts against the cylindrical pin.

[0008] By adopting the above technical solution, the motor drives the first link, and through the action of other links, the leg support mechanism completes its unfolding and closing functions.

[0009] Furthermore, a first support plate is fixedly installed in the middle of the fifth link.

[0010] Furthermore, a second support plate is fixedly mounted on one end of the third link.

[0011] By adopting the above technical solution, the leg support mechanism will be completely stored under the seat cushion frame when closed, and when unfolded, the motor drives the leg support mechanism to extend outward, while simultaneously supporting the thigh and calf leg supports of the sofa.

[0012] Furthermore, the seat cushion frame is equipped with leg support mechanisms on both the left and right sides.

[0013] Furthermore, the motor also includes a drive shaft, which is fixedly connected to the concentric bearings on both sides.

[0014] By adopting the above technical solution, the left and right leg support mechanisms can transmit torque evenly to adjust the angle of the sofa leg support, ensuring that the force on the left and right sides of the sofa leg support is sufficiently balanced during the angle adjustment process. At the same time, there are no hard objects in the middle of the sofa leg support, and the soft material filling can improve the softness and comfort of the sofa leg support.

[0015] Furthermore, the sofa frame also includes a guide rail and a guide strip. The guide rail is fixedly connected to the sofa frame, the guide strip is slidably connected to the guide rail, and the guide strip is fixedly connected to the seat cushion frame.

[0016] Furthermore, it also includes a connecting plate, which is fixedly connected to the guide bars on both sides.

[0017] Furthermore, the sofa frame also includes angle steel, which is fixedly connected to the left and right sides of the sofa frame.

[0018] By adopting the above technical solution, the strength and stability of the sofa frame structure are improved.

[0019] The beneficial effects of this invention are as follows:

[0020] (1) In the same sofa application environment, through a new structural design, a concentric bearing is adopted and a motor is arranged at the edge of the seat cushion frame to directly drive the leg support, thereby realizing the individual adjustment of the leg support and the design improvement of no hard objects under the foot pad frame, improving user comfort and meeting the demand for independent backrest adjustment.

[0021] (2) Through the above-mentioned electric leg support direct drive linkage mechanism, when the leg support mechanism is closed, the entire leg support mechanism is stored under the seat cushion frame, reducing space occupation, and is suitable for different styles of sofas, with strong versatility.

[0022] (3) Through the above-mentioned electric leg support direct drive linkage mechanism, the thigh and calf parts are supported simultaneously when the leg support mechanism is unfolded, which meets most of the support needs of the human body and improves user comfort. Attached image description:

[0023] Figure 1 This is an isometric view of the unfolded state of the direct drive linkage mechanism for an electric sofa leg rest according to the present invention;

[0024] Figure 2 This is an isometric view of the closed state of the direct drive linkage mechanism for an electric sofa leg rest according to the present invention;

[0025] Figure 3 This is a front view of the closed state of the direct drive linkage mechanism for an electric sofa leg rest according to the present invention;

[0026] Figure 4 This is a schematic diagram of the leg support mechanism in its unfolded state according to the present invention;

[0027] Figure 5 This is a simplified kinematic diagram of the leg support mechanism in its deployed state as described in this invention;

[0028] Figure 6 This is a schematic diagram of the leg support mechanism in its closed state according to the present invention;

[0029] Figure 7 This is a simplified kinematic diagram of the leg support mechanism in its closed state according to the present invention.

[0030] Reference numerals: 10. Sofa frame, 11. Seat cushion frame, 12. Motor, 121. Drive shaft, 13. Concentric bearing, 14. Guide rail, 15. Guide bar, 16. Connecting plate, 17. Angle steel, 20. Leg support mechanism, 21. First connecting rod, 22. Second connecting rod, 221. Cylindrical pin, 23. Third connecting rod, 231. Second support plate, 24. Fourth connecting rod, 25. Fifth connecting rod, 251. First support plate, 26. Sixth connecting rod, 261. Rotating plate, 27. Seventh connecting rod. Detailed Implementation

[0031] To make the objectives, technical solutions, and effects of this invention clearer, the invention will be further described below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention.

[0032] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0034] Reference Figures 1 to 7 A direct-drive linkage mechanism for an electric sofa leg rest includes a sofa frame 10 and a leg rest mechanism 20, wherein the leg rest mechanism 20 is fixedly connected to the sofa frame 10. The sofa frame 10 includes a seat cushion frame 11, a motor 12, and a concentric bearing 13. The seat cushion frame 11 is fixedly connected to the sofa frame 10, the motor 12 is fixedly connected to the seat cushion frame 11, and the concentric bearing 13 is fixedly connected to the seat cushion frame 11.

[0035] The leg support mechanism 20 includes a first link 21, a second link 22, a third link 23, a fourth link 24, a fifth link 25, a sixth link 26, and a seventh link 27. One end of the first link 21 is fixedly connected to the concentric bearing 13, and the other end of the first link 21 is rotatably connected to one end of the second link 22. One end of the second link 22 is rotatably connected to one end of the third link 23. The third link 23 is rotatably connected to one end of the fourth link 24 in the middle. The other end of the fourth link 24 is rotatably connected to one end of the fifth link 25. The fifth link 25 is rotatably connected to one end of the second link 22 in the middle. The other end of the fifth link 25 is rotatably connected to one end of the sixth link 26. The sixth link 26 is rotatably connected to the first link 21 in the middle. The other end of the sixth link 26 is rotatably connected to one end of the seventh link 27. The other end of the seventh link 27 is rotatably connected to the seat cushion frame 11.

[0036] Specifically, a cylindrical pin 221 is fixed in the middle of the second connecting rod 22.

[0037] Specifically, the sixth link 26 is fixedly provided with a rotating plate 261, and the lower side of the rotating plate 261 abuts against the cylindrical pin 221.

[0038] Preferably, the first link 21 rotates counterclockwise around the concentric bearing 13, and the sixth link 26 and the second link 22 connected to the first link 21 unfold to the right under the traction of the seventh link 27. The third link 23 and the fifth link 25 rotate counterclockwise under the push of the sixth link 26 and the second link 22. When the rotating plate 261 abuts against the cylindrical pin, the sixth link 26 is restricted, and the first link 21 stops rotating. At this point, the leg support mechanism 30 completes the adjustment to the lying position.

[0039] Preferably, at the leg support mechanism 30, the fifth link 25 is subjected to an external load N1 from the leg, and the distance between the external load N1 and the concentric bearing 18 is h. The first link 21 is subjected to a torque provided by the motor 12 at the bearing of the concentric bearing 18, the sixth link 26 is supported by a force N2 from the first link 21, and the second link 22 is supported by a force N3 from the first link 21, which satisfies:

[0040] N1·h=N2·cos(d)·EF+N3·cos(o)·EG+M3

[0041] Where M3 represents the torque applied to the seat cushion frame 11, d is the angle between N2 and the vertical plane, and o is the angle between N3 and the vertical plane. The torques provided by N2, N3, and M3 effectively support the leg rest and external loads.

[0042] Specifically, a first support plate 251 is fixedly provided in the middle of the fifth link 25, which is used to fix and install the sofa leg support, thereby increasing the force-bearing area of ​​the support.

[0043] Specifically, a second support plate 231 is fixed at one end of the third link 23, which is used to fix the sofa leg support and increase the force-bearing area of ​​the support.

[0044] Specifically, the seat cushion frame 11 is provided with leg support mechanisms 20 on both the left and right sides, which are used to evenly transmit torque to adjust the angle of the sofa leg support, ensuring that the force on the left and right sides of the sofa leg support is sufficiently balanced when it is unfolded and closed. Since there are no other hard objects such as other mechanisms in the middle of the sofa leg support, the filling of soft material can improve the softness and comfort of the sofa leg support.

[0045] Specifically, the motor 12 also includes a drive shaft 121, which is fixedly connected to the concentric bearings 13 on both sides.

[0046] Preferably, the motor 12 can be a geared motor, which can provide greater torque and ensure the stability of the leg support mechanism 20 when it unfolds and closes. The transmission shaft 121 can be a polygon with a cross-section of quadrilateral or larger to reduce relative rotation with the motor 12 and the concentric bearing 13, ensuring accurate transmission ratio and transmission stability.

[0047] Specifically, the sofa frame 10 also includes a guide rail 14 and a guide bar 15. The guide rail 14 is fixedly connected to the sofa frame 10, the guide bar 15 is slidably connected to the guide rail 14, and the guide bar 15 is fixedly connected to the cushion frame 11.

[0048] Specifically, it also includes a connecting plate 16, which is fixedly connected to the guide strips 15 on both sides and is used for the synchronous sliding of the guide strips 14 on the left and right sides to prevent the seat cushion frame 20 from generating torque and improve stability and lifespan.

[0049] Specifically, the sofa frame 10 also includes angle steel 17, which is fixedly connected to the left and right sides of the sofa frame 10 to improve the structural strength and stability of the sofa frame 10.

[0050] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention and should not be construed as limiting the specific implementation of the invention to these descriptions. For those skilled in the art, the architectural form of this invention can be flexibly varied without departing from its conceptual framework, leading to the derivation of a series of products. Any simple deductions or substitutions should be considered as falling within the patent protection scope defined by the submitted claims.

Claims

1. A direct-drive linkage mechanism for an electric leg rest on a sofa, comprising a sofa frame (10) and a leg rest mechanism (20), wherein the leg rest mechanism (20) is fixedly connected to the sofa frame (11), characterized in that, The sofa frame (10) includes: a cushion frame (11), a motor (12), and a concentric bearing (13); the cushion frame (11) is fixedly connected to the sofa frame (10), the motor (12) is fixedly connected to the cushion frame (11), and the concentric bearing (13) is fixedly connected to the cushion frame (11). The leg support mechanism (20) includes: a first link (21), a second link (22), a third link (23), a fourth link (24), a fifth link (25), a sixth link (26), and a seventh link (27); one end of the first link (21) is fixedly connected to the concentric bearing (13), the other end of the first link (21) is rotatably connected to one end of the second link (22), one end of the second link (22) is rotatably connected to one end of the third link (23), and the third link (23) is rotatably connected to the fourth link in the middle. (24) One end of the fourth link (24) is rotatably connected to one end of the fifth link (25). The middle of the fifth link (25) is rotatably connected to one end of the second link (22). The other end of the fifth link (25) is rotatably connected to one end of the sixth link (26). The middle of the sixth link (26) is rotatably connected to the middle of the first link (21). The other end of the sixth link (26) is rotatably connected to one end of the seventh link (27). The other end of the seventh link (27) is rotatably connected to the seat cushion frame (11).

2. The direct-drive linkage mechanism for an electric sofa leg rest as described in claim 1, characterized in that, The second connecting rod (22) is fixed with a cylindrical pin (221) in the middle.

3. The direct-drive linkage mechanism for an electric sofa leg rest as described in claim 2, characterized in that, The sixth link (26) is fixed with a rotating plate (261), and the lower side of the rotating plate (261) abuts against the cylindrical pin (221).

4. The direct-drive linkage mechanism for an electric sofa leg rest as described in claim 1, characterized in that, The fifth link (25) is fixed with a first support plate (251) in the middle.

5. The direct-drive linkage mechanism for an electric sofa leg rest as described in claim 1, characterized in that, The third link (23) is fixed at one end with a second support plate (231).

6. The direct-drive linkage mechanism for an electric sofa leg rest as described in claim 1, characterized in that, The seat cushion frame (11) is provided with leg support mechanisms (20) on both the left and right sides.

7. The direct-drive linkage mechanism for an electric sofa leg rest as described in claim 1, characterized in that, The motor (12) also includes a drive shaft (121), which is fixedly connected to the concentric bearings (13) on both sides.

8. The direct-drive linkage mechanism for an electric sofa leg rest as described in claim 1, characterized in that, The sofa frame (10) also includes a guide rail (14) and a guide bar (15); the guide rail (14) is fixedly connected to the sofa frame (10), the guide bar (15) is slidably connected to the guide rail (14), and the guide bar (15) is fixedly connected to the cushion frame (11).

9. The direct-drive linkage mechanism for an electric sofa leg rest as described in claim 1, characterized in that, It also includes a connecting plate (16), which is fixedly connected to the guide bars (15) on both sides.

10. The direct-drive linkage mechanism for an electric sofa leg rest as described in claim 1, characterized in that, The sofa frame (10) also includes angle steel (17), which is fixedly connected to the left and right sofa frames (10).

Images