A sofa back drive mechanism

Abstract

The application relates to the technical field of sofas, and discloses a sofa backrest transmission mechanism, which comprises a cushion, two side rests are fixedly installed on the two sides of the cushion, an upper end of the cushion is provided with a backrest, arc-shaped shells are arranged in the interiors of the two side rests respectively, arc-shaped tracks are formed in the inner walls of the two arc-shaped shells respectively, pulleys are slidably connected to the inner walls of the arc-shaped shells which are located in the interiors of the corresponding arc-shaped tracks, connecting rods are fixedly installed on the sides opposite to the two pulleys respectively, the arc-shaped shells and the arc-shaped tracks arranged in the interiors of the two side rests make the backrest slide along the arc-shaped tracks to adjust the angle through the pulleys, and the fixed positions are locked through a locking mechanism, the connecting rods and the backrest are rotationally arranged, the backrest can be moved and adjusted along the arc of the arc-shaped shell when the backrest is attached to a wall, the problem of the back being suspended caused by the traditional fixed backrest is solved, the supporting angle can be self-adaptively adjusted according to the body shape and the sitting posture of a user, the back attachment and the comfort are improved, the space of the side part of the sofa is fully utilized, and the cost is low.

Description

Technical Field

[0001] This application relates to the field of sofa technology, specifically to a sofa backrest transmission mechanism. Background Technology

[0002] The sofa backrest transmission mechanism is the core component for sofas to achieve angle adjustment and posture change. It drives the backrest support to move through mechanical or electric control to meet the diverse needs of users such as sitting, lying down and reclining. Its design needs to take into account structural stability, smooth movement and space utilization. It is commonly found in smart furniture such as electric sofas and functional sofas.

[0003] Currently, home sofas are generally placed on one side of a wall, with the sofa leaning against the wall. The backrest is usually fixed in place, so when the user leans against the backrest, their back cannot be fully pressed against it, and some of their back is in a suspended state, which does not provide a better user experience. Utility Model Content

[0004] The purpose of this application is to provide a sofa backrest transmission mechanism, which solves the problem mentioned in the background art that home sofas are generally placed on one side of the wall and lean against the wall, while the backrest is generally fixed. As a result, when the user leans against the backrest, the user's back cannot be fully pressed against the backrest, and some of the back is in a suspended state, which does not provide a better user experience.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0006] This application provides a sofa backrest transmission mechanism, including a seat cushion, side cushions fixedly installed on both sides of the seat cushion, and a backrest placed on the upper end of the seat cushion. An arc-shaped shell is provided inside each of the two side cushions, and an arc-shaped track is provided on the inner wall of each of the two arc-shaped shells. A pulley is slidably connected to the inner wall of the arc-shaped shell located inside the corresponding arc-shaped track. A connecting rod is fixedly installed on one side of each of the two pulleys facing each other. The side of each connecting rod away from the pulley is rotatably connected to the backrest. A locking mechanism is provided between each of the two pulleys and the arc-shaped shell.

[0007] By adopting the above technical solution, with two arc-shaped shells and arc-shaped tracks set on the inner side, the backrest can slide along the arc-shaped trajectory via pulleys to adjust the angle, and the locking mechanism can fix the position. With the connecting rod and the backrest rotating, it can also move and adjust along the arc of the arc-shaped shell when the backrest is against the wall, which solves the problem of back suspension caused by traditional fixed backrests. It can also adaptively adjust the support angle according to the user's body shape and sitting posture, improve the back fit and comfort, make full use of the side space of the sofa, and has a low cost.

[0008] Optionally, the locking mechanism includes a threaded rod threaded into the inner wall of the pulley, and a threaded cap is fixedly installed on the side of the threaded rod away from the pulley.

[0009] By adopting the above technical solution, the threaded cap allows users to easily screw on the threaded rod. The threaded rod is screwed in with the thread engagement in the inner wall of the pulley, and the threaded cap can abut against the arc-shaped shell, thereby locking the pulley and positioning the backrest offset.

[0010] Optionally, the outer wall of the threaded cap is provided with a set of anti-slip grooves.

[0011] By adopting the above technical solution, the anti-slip groove can make it easier for users to tighten the threaded cap and prevent the user from slipping when tightening it.

[0012] Optionally, the seat cushion, backrest, and siderest are each provided with a frame inside, and the outer wall of the frame is covered with a sponge board.

[0013] By adopting the above technical solution, the frame can provide support and fixation for the sponge board.

[0014] Optionally, the outer wall of the sponge board is sewn with a leather sleeve.

[0015] By adopting the above technical solution, the leather sleeve can wrap around the sponge board and the frame.

[0016] Optionally, the lower end of the seat cushion is fixedly equipped with multiple support legs.

[0017] By adopting the above technical solution, the support legs can provide support for the seat cushion.

[0018] Optionally, the two connecting rods are rotatably mounted to the backrest frame.

[0019] By adopting the above technical solution, the backrest and connecting rod are rotated and installed, which facilitates the angle adjustment of the backrest along the arc of the shell. When the backrest is placed vertically, it is not convenient for the backrest to move along the arc of the shell at the junction with the base. However, by rotating the connecting rod and the backrest, the angle of the backrest can be adjusted, making it convenient for the backrest to move and adjust along the arc of the shell.

[0020] Optionally, the arc-shaped shell and the connecting rod are made of stainless steel.

[0021] By adopting the above technical solution, and by using stainless steel for the arc-shaped shell and connecting rod, its service life is enhanced.

[0022] Compared with the prior art, the beneficial effects of the technical solution of this application are as follows:

[0023] This technical solution utilizes two inwardly arranged arc-shaped shells and arc-shaped tracks on both sides, allowing the backrest to slide along the arc-shaped trajectory via pulleys to adjust its angle. A locking mechanism then fixes its position. With the connecting rod and backrest rotating, the backrest can move and adjust along the arc of the shell even when it is against the wall. This solves the problem of back suspension caused by traditional fixed backrests. It also adaptively adjusts the support angle according to the user's body shape and sitting posture, improving back support and comfort, fully utilizing the side space of the sofa, and is cost-effective. Attached Figure Description

[0024] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0025] Figure 1 This is an axial view schematic diagram of a sofa backrest transmission mechanism according to this application;

[0026] Figure 2 This is a side cross-sectional view of a sofa backrest transmission mechanism according to this application;

[0027] Figure 3 This is a first side view of the arc-shaped shell of a sofa backrest transmission mechanism according to this application;

[0028] Figure 4 This is a second side view of the arc-shaped shell of a sofa backrest transmission mechanism according to this application;

[0029] Figure 5 This is a schematic diagram of the second side view of the arc-shaped shell of a sofa backrest transmission mechanism according to this application.

[0030] In the diagram: 1. Seat cushion; 2. Backrest; 3. Side rail; 4. Frame; 5. Sponge board; 6. Leather cover; 7. Support legs; 8. Arc-shaped shell; 9. Arc-shaped track; 10. Pulley; 11. Threaded rod; 12. Threaded cap; 13. Connecting rod; 14. Anti-slip groove. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0032] Please see Figure 1-5This application provides a technical solution: a sofa backrest transmission mechanism, including a seat cushion 1, side supports 3 fixedly installed on both sides of the seat cushion 1, a backrest 2 placed on the upper end of the seat cushion 1, an arc-shaped shell 8 respectively provided inside the two side supports 3, an arc-shaped track 9 opened on the inner wall of the two arc-shaped shells 8 respectively, a pulley 10 slidably connected to the inner wall of the arc-shaped shell 8 located inside the corresponding arc-shaped track 9, a connecting rod 13 fixedly installed on the opposite side of the two pulleys 10 respectively, the side of each connecting rod 13 away from the pulley 10 is rotatably set with the backrest 2 respectively, and a locking mechanism is provided between the two pulleys 10 and the arc-shaped shell 8 respectively;

[0033] In the technical solution of this application, the backrest 2 is equipped with an arc-shaped shell 8 and an arc-shaped track 9 inside the two side backrests 3. The backrest 2 slides along the arc-shaped track via the pulley 10 to adjust the angle. The locking mechanism fixes the position. When the connecting rod 13 and the backrest 2 are rotated, the backrest 2 can move and adjust along the arc of the arc-shaped shell 8 when it is in contact with the wall. This solves the problem of back suspension caused by traditional fixed backrests. It can also adaptively adjust the support angle according to the user's body shape and sitting posture, improve the back fit and comfort, make full use of the side space of the sofa, and has a low cost.

[0034] In the technical solution of this application, such as Figures 1-3 As shown, the seat cushion 1, backrest 2, and side support 3 are each equipped with a frame 4 inside. The outer wall of the frame 4 is fitted with a sponge board 5, which supports and fixes the sponge board 5. The outer wall of the sponge board 5 is sewn with a leather sleeve 6, which wraps the sponge board 5 and the frame 4. Two connecting rods 13 are rotatably installed with the frame 4 in the backrest 2. By rotatably installing the backrest 2 with the connecting rods 13, it is convenient for the backrest 2 to be adjusted along the arc of the curved shell 8. When the backrest 2 is placed vertically, it is inconvenient for the backrest 2 to move along the arc of the curved shell 8 at the junction with the base. However, by rotatably installing the connecting rods 13 with the backrest 2, the angle of the backrest 2 can be adjusted, making it convenient for the backrest 2 to move and adjust along the arc of the curved shell 8.

[0035] In the technical solution of this application, such as Figure 1 , Figure 4 and Figure 5 As shown, the locking mechanism includes a threaded rod 11 threaded into the inner wall of the pulley 10. A threaded cap 12 is fixedly installed on the side of the threaded rod 11 away from the pulley 10. The threaded cap 12 allows the user to easily turn the threaded rod 11. The threaded rod 11 is screwed into the inner wall of the pulley 10 under the threaded engagement, and the threaded cap 12 can abut against the arc-shaped shell 8, thereby locking the pulley 10 and positioning the backrest 2. A set of anti-slip grooves 14 are provided on the outer wall of the threaded cap 12. The anti-slip grooves 14 allow the user to easily turn the threaded cap 12 and prevent slippage during turning.

[0036] In the technical solution of this application, such as Figure 1 As shown, multiple support legs 7 are fixedly installed at the lower end of the seat cushion 1, which can support the seat cushion 1.

[0037] In use, the user screws on the threaded cap 12 with the anti-slip groove 14, which drives the threaded rod 11 to screw into the inner wall of the pulley 10, causing the threaded cap 12 to press against the arc-shaped shell 8, thereby positioning the pulley 10. The backrest 2 is linked to the pulley 10 via a rotatably mounted connecting rod 13. When the angle needs to be adjusted, the threaded cap 12 is screwed in the opposite direction to release the locking state. The backrest 2 then drives the pulley 10 to slide along the arc-shaped track 9 inside the arc-shaped shell 8 via the connecting rod 13. The stainless steel arc-shaped shell 8 and the connecting rod 13 are used to secure the pulley 10. To maintain structural strength, and while the backrest 2 is flush against the wall, there is still room for angle adjustment. The backrest 2 can adaptively adjust the support angle along the arc-shaped trajectory, making it convenient for the user to rest their back. When the user is flush against the wall, the threaded cap 12 is turned again, causing the threaded rod 11 to rotate and enter the inner wall of the pulley 10. Then, the threaded cap 12 abuts against the outer wall of the arc-shaped shell 8 to achieve a locking and positioning effect. The movement of the backrest 2 can be adjusted by the arc-shaped track 9 in the side space, without the need for additional transmission components, thus reducing costs.

Claims

1. A sofa backrest transmission mechanism, characterized in that: The cushion includes a seat (1), with side rests (3) fixedly installed on both sides of the seat (1) and a backrest (2) placed on the upper end of the seat (1). The two side rests (3) are respectively provided with arc-shaped shells (8). The inner walls of the two arc-shaped shells (8) are respectively provided with arc-shaped tracks (9). The inner walls of the arc-shaped shells (8) located inside the corresponding arc-shaped tracks (9) are slidably connected with pulleys (10). The two pulleys (10) are respectively fixedly installed with connecting rods (13) on the opposite side. The side of each connecting rod (13) away from the pulley (10) is respectively rotatably set with the backrest (2). The two pulleys (10) and the arc-shaped shells (8) are respectively provided with locking mechanisms.

2. The sofa backrest transmission mechanism according to claim 1, characterized in that, The locking mechanism includes a threaded rod (11) threaded in the inner wall of the pulley (10), and a threaded cap (12) is fixedly installed on the side of the threaded rod (11) away from the pulley (10).

3. The sofa backrest transmission mechanism according to claim 2, characterized in that, The outer wall of the threaded cap (12) is provided with a set of anti-slip grooves (14).

4. The sofa backrest transmission mechanism according to claim 1, characterized in that, The seat cushion (1), backrest (2) and side support (3) are respectively provided with frames (4), and the outer wall of the frame (4) is covered with a sponge board (5).

5. A sofa backrest transmission mechanism according to claim 4, characterized in that, The outer wall of the sponge board (5) is sewn with a leather sleeve (6).

6. The sofa backrest transmission mechanism according to claim 1, characterized in that, The lower end of the cushion (1) is fixedly equipped with multiple support legs (7).

7. A sofa backrest transmission mechanism according to claim 1, characterized in that, The two connecting rods (13) are rotatably mounted to the frame (4) in the backrest (2).

8. A sofa backrest transmission mechanism according to claim 1, characterized in that, The arc-shaped shell (8) and the connecting rod (13) are made of stainless steel.

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