Sofa iron stand backrest with stable structure

Abstract

The utility model discloses a sofa iron stand backrest with a stable structure, which comprises a sofa base and a sofa backrest, a bearing iron stand is mounted in the sofa backrest, the bearing iron stand is rotatably connected with the sofa base, and an automatic angle adjusting component is connected between the sofa base and the bearing iron stand. The automatic angle adjusting assembly comprises a telescopic device hinged to the inner bottom wall of the sofa base, a seesaw rotationally connected between the inner walls of the two sides of the sofa base, a fixing plate fixedly welded to the back face of the bearing iron frame and a clamping fork, and the length change of the telescopic device can drive the seesaw to rotate around the bearing lever; a second hinge seat pushes a clamping fork to change the angle, so that a bearing iron frame rotates by a certain angle around a shaft rod, the inclination angle of the bearing iron frame is changed, the inclination angle of the sofa backrest is changed, and the sofa backrest is suitable for being used by people with different heights and sitting posture preferences; and the user can keep the optimal sitting posture state.

Description

Technical Field

[0001] This utility model relates to the field of sofa technology, and in particular to a structurally stable sofa backrest with a metal frame. Background Technology

[0002] Sofas are a type of multifunctional furniture used to provide comfortable seating and resting space. They come in a variety of types, including single, double, and triple sofas, L-shaped sofas, and convertible sofa beds. Sofa frames are usually made of wood, metal, or hard plastic, while cushions and fillings may include foam, down, or fibers. Covering materials can be fabric, leather, or artificial leather, each with its unique feel and cleaning requirements. Sofa styles range from modern minimalist to traditional luxury, and in terms of functionality, some sofas have adjustable backrests, while others offer removable or washable covers and built-in storage space.

[0003] Chinese Patent Publication No. CN217644873U discloses a simplified functional sofa, including a support frame for ground support and a support assembly mounted on the support frame. The support assembly includes a backrest, a seating section, and a footstool connected sequentially to each other. The footstool is rotatably connected to the other end of the seating section. A third drive motor for driving the footstool to rotate is provided on the seating section. The support frame includes two armrests located on both sides of the support assembly. The seating section is fixedly connected to the two armrests. Each armrest includes an armrest board, one of which has a receiving groove in which the third drive motor is located. Because the footstool rotates around the seating section, it replaces the forward translational movement of the footstool in a functional iron frame sofa structure. Compared to the functional iron frame sofa structure, the footstool adjustment in this application eliminates the leg-rubbing sensation, improving user comfort.

[0004] The backrest of the aforementioned technology can rotate at a fixed point, but the force on the backrest drive rod is concentrated, resulting in unreasonable mechanical design and easy damage to the drive equipment. Therefore, this utility model discloses a structurally stable sofa iron frame backrest to solve the above problems. Utility Model Content

[0005] The purpose of this utility model is to provide a structurally stable sofa backrest with a metal frame, in order to solve the problem mentioned in the background art that the stress concentration of traditional sofa backrests leads to unreasonable mechanical design and easy damage to the drive equipment.

[0006] To achieve the above objectives, the present invention provides the following solution to the aforementioned technical problems:

[0007] A structurally stable sofa backrest with a metal frame includes a sofa base and a sofa backrest. A load-bearing metal frame is installed inside the sofa backrest. The load-bearing metal frame is rotatably connected to the sofa base, and an automatic angle adjustment component is connected between the sofa base and the load-bearing metal frame.

[0008] The automatic angle adjustment component includes a telescopic device hinged to the inner bottom wall of the sofa base, a rocker arm rotatably connected between the inner walls of the two sides of the sofa base, a fixed plate and a clamping fork fixedly welded to the back of the load-bearing iron frame. The telescopic device, rocker arm, clamping fork and fixed plate are connected in sequence so that the tilt angle of the load-bearing iron frame changes with the telescopic movement of the telescopic device.

[0009] As a further embodiment of this utility model, the output end of the telescopic device is fixedly connected to a first hinge seat, and the first hinge seat is rotatably connected to a rocker plate via a first rotating pin.

[0010] As a further embodiment of this utility model, a support bar is transversely inserted inside the seesaw, and the two ends of the support bar are respectively rotatably connected to the adjacent side wall of the sofa base. A second hinge seat is fixedly connected to the end of the seesaw away from the telescopic device.

[0011] As a further embodiment of this utility model, the distance between the support bar and the first hinge seat is greater than the distance between the support bar and the second hinge seat.

[0012] As a further embodiment of this utility model, a connecting rod is fixed in the middle of the clamping fork, and the connecting rod is rotatably connected to the second hinge seat through a second rotating pin. Both ends of the clamping fork are fixedly connected to a third hinge seat, and each third hinge seat is rotatably connected to a slider through a third rotating pin.

[0013] As a further embodiment of this utility model, two guide grooves for guiding the slider to slide are provided on the side wall of the fixing plate.

[0014] As a further embodiment of this utility model, a plurality of reinforcing rods are fixed between the upper and lower side walls of the load-bearing iron frame, and two extension plates are fixed at the bottom end of the load-bearing iron frame. A shaft is rotatably sleeved between the two extension plates, and the shaft is fixedly connected between the inner walls of both sides of the sofa base.

[0015] As a further embodiment of this utility model, the telescopic device is any one of an electric telescopic rod, a pneumatic telescopic rod, or a hydraulic telescopic rod.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] 1. This utility model provides a structurally stable sofa backrest with a metal frame. The length change of the telescopic device can drive the rocker arm to rotate around the support bar, causing the end of the rocker arm away from the telescopic device to move in the opposite direction. The second hinge seat pushes the angle of the clamping fork to change, causing the load-bearing metal frame to rotate around the shaft by a certain angle. The change in the tilt angle of the load-bearing metal frame causes the tilt angle of the sofa backrest to change. It is suitable for people of different heights and sitting posture preferences, allowing users to maintain the best sitting posture.

[0018] 2. This utility model provides a structurally stable sofa iron frame backrest with a telescopic device located directly below the sofa base in the sitting position, effectively utilizing the internal space of the sofa base. The seesaw utilizes the lever principle, and the telescopic device can generate a large movement effect by applying a small force to drive the load-bearing iron frame. Moreover, the telescopic device can withstand loads exceeding its design, fully ensuring the stability of the sofa. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0020] Figure 1 This is a side sectional view of a structurally stable sofa iron frame backrest according to the present invention.

[0021] Figure 2 This is a three-dimensional structural diagram of an automatic angle adjustment component in the backrest of a sofa with a stable structure according to the present invention.

[0022] Figure 3 This utility model presents a structurally stable combination of a telescopic device and a rocker backrest in a sofa frame.

[0023] The components represented by each number in the attached diagram are listed below: 1. Sofa base; 2. Sofa backrest; 3. Load-bearing frame; 31. Reinforcing rod; 32. Extension plate; 33. Shaft; 4. Automatic angle adjustment assembly; 41. Telescopic device; 411. First hinge seat; 412. First rotating pin; 42. Rocker; 421. Support bar; 422. Second hinge seat; 43. Fixing plate; 431. Guide groove; 44. Clamping fork; 441. Connecting rod; 442. Second rotating pin; 443. Third hinge seat; 444. Third rotating pin; 445. Slider. Detailed Implementation

[0024] The present invention will be further described below with reference to the embodiments.

[0025] Please see Figure 1-3 This utility model provides a structurally stable sofa iron frame backrest, including a sofa base 1 and a sofa backrest 2;

[0026] Specifically, the sofa base 1 and sofa backrest 2 often use wood as the main frame material, such as larch, beech, mixed wood, and plywood. Solid wood frame bases are durable and environmentally friendly. Pine is widely used due to its stability and flexibility. Some modern designs may use aluminum alloy bases. Such bases have an overall beautiful and textured effect, and the corners are rounded and safe. After the sofa base 1 and sofa backrest 2 are made, soft upholstery and sofa fabric are wrapped on the outside of the sofa base 1 and sofa backrest 2, so that the sofa can have a combination of beauty and comfort.

[0027] Furthermore, a load-bearing iron frame 3 is installed inside the sofa backrest 2. The load-bearing iron frame 3 is rotatably connected to the sofa base 1. Multiple reinforcing rods 31 are fixed between the upper and lower side walls of the load-bearing iron frame 3. Two extension plates 32 are fixed at the bottom end of the load-bearing iron frame 3. A shaft 33 is rotatably sleeved between the two extension plates 32. The shaft 33 is fixedly connected between the inner walls on both sides of the sofa base 1.

[0028] Specifically, the reinforcing rod 31 can be arranged vertically or horizontally. Its main function is to enhance the structural stability and load-bearing capacity of the load-bearing iron frame 3 and prevent deformation or damage when subjected to force. The extension plate 32 and the shaft 33 cooperate to form a stable connection between the load-bearing iron frame 3 and the sofa base 1, and the load-bearing iron frame 3 can rotate around the shaft 33.

[0029] Furthermore, an automatic angle adjustment assembly 4 is connected between the sofa base 1 and the load-bearing iron frame 3. The automatic angle adjustment assembly 4 includes a telescopic device 41 hinged to the inner bottom wall of the sofa base 1, a rocker 42 rotatably connected between the inner walls of the two sides of the sofa base 1, a fixing plate 43 and a clamping fork 44 fixedly welded to the back of the load-bearing iron frame 3. The telescopic device 41, the rocker 42, the clamping fork 44 and the fixing plate 43 are connected in sequence so that the tilt angle of the load-bearing iron frame 3 changes with the telescopic movement of the telescopic device 41.

[0030] Specifically, the telescopic device 41 applies force to the clamping fork 44 over a long distance via the rocker arm 42, which can effectively utilize the internal space of the sofa base 1.

[0031] Furthermore, the output end of the telescopic device 41 is fixedly connected to a first hinge seat 411, and the first hinge seat 411 is rotatably connected to a rocker plate 42 via a first rotating pin 412.

[0032] Specifically, the telescopic movement of the telescopic device 41 can be effectively transmitted to the rocker 42 through the first hinge seat 411 and the first rotating pin 412, and can be electrically controlled. It is worth noting that the control panel of the telescopic device 41 is generally located on the side of the sofa armrest for the convenience of the user.

[0033] Furthermore, the telescopic device 41 is any one of an electric telescopic rod, a pneumatic telescopic rod, or a hydraulic telescopic rod;

[0034] Specifically, an electric telescopic pole typically includes a motor and a gear system, with the motor's rotation driving the telescopic pole's extension and retraction. A pneumatic telescopic pole achieves its extension and retraction function through the movement of a piston within a cylinder, and typically requires an air source, such as a compressor, to provide the necessary pressure. A hydraulic telescopic pole includes a hydraulic pump and one or more hydraulic cylinders, with the hydraulic cylinders extending and retracting through changes in liquid pressure. It is worth noting that the telescopic device 41 in this application is intended to achieve an electrically controlled extension and retraction function.

[0035] Furthermore, a support bar 421 is transversely inserted inside the seesaw 42, and the two ends of the support bar 421 are rotatably connected to the adjacent side wall of the sofa base 1 respectively. A second hinge seat 422 is fixedly connected to the end of the seesaw 42 away from the telescopic device 41.

[0036] Specifically, when the telescopic device 41 extends or retracts, it pushes the support bar 421 through the first hinge seat 411. The rotation of the support bar 421 causes the seesaw 42 to rotate around it. The other end of the seesaw 42 pushes the clamp fork 44 through the second hinge seat 422 and the connecting rod 441, ultimately realizing the rotation of the load-bearing iron frame 3 around the shaft 33 and adjusting the tilt angle of the sofa backrest 2.

[0037] Furthermore, the distance between the support bar 421 and the first hinge seat 411 is greater than the distance between the support bar 421 and the second hinge seat 422;

[0038] Specifically, the different distances between the support bar 421 and the two hinge seats actually utilize the lever principle in mechanics. The lever principle states that the effect of a force is related to the length of the lever arm. The longer the lever arm, the more obvious the effect of the force. When the distance between the support bar 421 and the first hinge seat 411 is greater than the distance between the support bar 421 and the second hinge seat 422, this forms a force-saving lever, making it easier to adjust the tilt angle of the load-bearing iron frame 3. Conversely, it also increases the maximum load capacity of the telescopic device 41 and prevents the telescopic device 41 from being damaged.

[0039] Furthermore, a connecting rod 441 is fixed in the middle of the clamping fork 44. The connecting rod 441 is rotatably connected to the second hinge seat 422 through the second rotating pin 442. Both ends of the clamping fork 44 are fixedly connected to the third hinge seat 443. The third hinge seat 443 is rotatably connected to the slider 445 through the third rotating pin 444.

[0040] Specifically, the telescopic movement of the telescopic device 41 drives the rocker 42, which in turn pushes the clamping fork 44 through the connecting rod 441 and the second hinge seat 422. Finally, the tilt angle of the load-bearing iron frame 3 is changed through the sliding of the third hinge seat 443 and the slider 445. Moreover, the clamping fork 44 has two ends, which can support the load-bearing iron frame 3 on the left and right, thus improving the stability of the sofa backrest 2.

[0041] Furthermore, two guide grooves 431 are provided on the side wall of the fixing plate 43 to guide the sliding of the slider 445;

[0042] Specifically, the presence of the guide groove 431 ensures the stability and accuracy of the slider 445 during movement, prevents unnecessary offset or shaking of the slider 445 between the load-bearing iron frame 3 and the sofa base 1, and can prevent the linkage structure from jamming due to changes in the angle of the load-bearing iron frame 3.

[0043] Working principle: When in use, the telescopic device 41 is activated. The change in length of the telescopic device 41 can drive the rocker 42 to rotate around the support bar 421, so that the end of the rocker 42 away from the telescopic device 41 moves in the opposite direction. The second hinge seat 422 pushes the angle of the clamp fork 44 to change, so that the load-bearing iron frame 3 rotates around the shaft 33 by a certain angle. The change in the tilt angle of the load-bearing iron frame 3 causes the tilt angle of the sofa back 2 to change, which is suitable for people of different heights and sitting posture preferences.

Claims

1. A structurally stable sofa backrest with a metal frame, comprising a sofa base (1) and a sofa backrest (2), characterized in that, A load-bearing iron frame (3) is installed inside the sofa backrest (2). The load-bearing iron frame (3) is rotatably connected to the sofa base (1), and an automatic angle adjustment component (4) is connected between the sofa base (1) and the load-bearing iron frame (3). The automatic angle adjustment component (4) includes a telescopic device (41) hinged to the inner bottom wall of the sofa base (1), a rocker (42) rotatably connected between the inner walls of both sides of the sofa base (1), a fixing plate (43) and a clamping fork (44) fixedly welded to the back of the load-bearing iron frame (3). The telescopic device (41), rocker (42), clamping fork (44) and fixing plate (43) are connected in sequence so that the tilt angle of the load-bearing iron frame (3) changes with the telescopic movement of the telescopic device (41).

2. The structurally stable sofa frame backrest according to claim 1, characterized in that: The output end of the telescopic device (41) is fixedly connected to a first hinge seat (411), and the first hinge seat (411) is rotatably connected to a rocker plate (42) through a first rotating pin (412).

3. A structurally stable sofa iron frame backrest according to claim 2, characterized in that: A support bar (421) is horizontally inserted inside the seesaw (42). The two ends of the support bar (421) are rotatably connected to the adjacent side wall of the sofa base (1). A second hinge seat (422) is fixedly connected to the end of the seesaw (42) away from the telescopic device (41).

4. A structurally stable sofa frame backrest according to claim 3, characterized in that: The distance between the support bar (421) and the first hinge seat (411) is greater than the distance between the support bar (421) and the second hinge seat (422).

5. A structurally stable sofa frame backrest according to claim 4, characterized in that: A connecting rod (441) is fixed in the middle of the clamping fork (44). The connecting rod (441) is rotatably connected to the second hinge seat (422) through the second rotating pin (442). Both ends of the clamping fork (44) are fixedly connected to the third hinge seat (443). The third hinge seat (443) is rotatably connected to the slider (445) through the third rotating pin (444).

6. A structurally stable sofa frame backrest according to claim 5, characterized in that: Two guide grooves (431) are provided on the side wall of the fixed plate (43) to guide the sliding of the slider (445).

7. A structurally stable sofa frame backrest according to claim 6, characterized in that: Multiple reinforcing rods (31) are fixed between the upper and lower side walls of the load-bearing iron frame (3). Two extension plates (32) are fixed at the bottom of the load-bearing iron frame (3). A shaft (33) is rotatably sleeved between the two extension plates (32). The shaft (33) is fixedly connected between the inner walls on both sides of the sofa base (1).

8. A structurally stable sofa frame backrest according to claim 1, characterized in that: The telescopic device (41) is any one of an electric telescopic rod, a pneumatic telescopic rod, or a hydraulic telescopic rod.

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