Mechanical stretching structure of multifunctional sofa backrest

Abstract

The utility model discloses a mechanical stretching structure of a multifunctional sofa backrest, which belongs to the technical field of sofa backrest stretching and comprises a sofa framework and a backrest framework rotatably mounted on the sofa framework. A rotating shaft rotationally inserted between the two protruding parts is fixed to the bottom end of the backrest framework, a plurality of positioning grooves are formed in the inner walls of the protruding parts in an annular array mode, a telescopic groove is formed in the outer wall of the rotating shaft, and positioning blocks clamped with the positioning grooves are elastically inserted into the telescopic groove. A telescopic groove is formed in the backrest framework, an electromagnetic plate used for contracting the positioning block is fixed to the bottom wall of the telescopic groove, sliding grooves are formed in the two ends of the sofa framework, fixing rods are installed in the two sliding grooves in an embedded mode, armrests are rotatably installed at the two ends of the backrest framework, and the mechanical stretching structure of the multifunctional sofa backrest improves the convenience of angle adjustment of the backrest framework.

Description

Technical Field

[0001] The utility model belongs to the technical field of sofa backrest extension, and in particular relates to a mechanical extension structure of a multifunctional sofa backrest. Background Art

[0002] A sofa is a kind of soft furniture, which is a multi-seat chair with soft cushions and armrests on both sides. Existing sofas mainly include a seat, guard plates on both sides of the seat, and a backrest. The seat, guard plates, and backrest are all fixedly connected together. Existing sofas are generally fixed after they are made. When users of different heights sit on the sofa, the backrest supports different parts, and the comfort generated when different parts are supported is also different. Since the backrests of most existing sofas cannot be moved, in order to improve the comfort of the back when it is supported, users are often required to adjust their sitting posture, but the adjustment of the sitting posture may cause the other parts of the body to not be in the most comfortable state.

[0003] Application number 202322709581.3 is a sofa with a movable backrest, relating to the technical field of sofas, including a sofa body and an adjustment mechanism, the sofa body including a pair of armrests, a pair of guard plates connected between the pair of armrests, a back cushion installed on one side of one of the guard plates, a pair of backrests provided on one side of the back cushion, the adjustment mechanism including a pair of motors, and the pair of motors are symmetrically installed inside the back cushion, a pair of slide grooves are opened on one side of the back cushion, threaded rods are installed inside the pair of slide grooves, the output end of the motor is transmission-connected to the threaded rod, a slider is bite-connected to the outer side of the threaded rod, the slider can slide inside the slide groove, the slider is connected to the backrest, a pair of control buttons are installed on the top of the pair of armrests, and the pair of control buttons and the motor are electrically connected by wires.

[0004] Although the above technical solution can adjust the height of the sofa backrest through the threaded rod, the sitting angle cannot be adjusted after adjusting the height of the backrest. Therefore, the sitting posture cannot be adjusted without adjusting the sofa backrest angle, and the comfort is poor. Utility Model Content

[0005] (1) Technical issues to be solved

[0006] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a mechanical extension structure for a multifunctional sofa backrest, which aims to solve the technical problem that the sitting angle cannot be adjusted after adjusting the height of the backrest in the prior art. Therefore, without adjusting the angle of the sofa backrest, the sitting posture cannot be adjusted, resulting in poor comfort.

[0007] (2) Technical solution

[0008] In order to solve the above technical problems, the utility model provides a mechanical extension structure of a multifunctional sofa backrest, which comprises a sofa frame and a backrest frame rotatably mounted on the sofa frame, wherein the sofa frame is symmetrically fixed with raised parts, a rotating shaft rotatably inserted between two raised parts is fixed to the bottom end of the backrest frame, a plurality of positioning grooves are provided on the inner wall of the raised part in a circular array, a telescopic groove is provided on the outer wall of the rotating shaft, a positioning block which is clamped with the positioning groove is elastically inserted in the telescopic groove, and an electromagnetic plate for contracting the positioning block is fixed to the bottom wall of the telescopic groove.

[0009] When the mechanical extension structure of the multifunctional sofa backrest of the present technical solution is used, protrusions are fixed at both ends of the sofa frame, and a rotating shaft rotatably inserted between the two protrusions is fixed on the backrest frame. The second spring in the telescopic groove on the outer wall of the rotating shaft pushes the positioning block to fit in the positioning groove on the inner wall of the protrusion, so that the sofa frame and the backrest frame are axially fixed. When adjusting the angle of the backrest frame, the electromagnetic plate is activated by a button. After the electromagnetic plate and the magnetic suction rod are attracted, the positioning block is retracted into the telescopic groove, and the rotating shaft is rotated in the protrusion to adjust the angle of the backrest frame. After the adjustment, the electromagnetic valve is closed, and the second spring pushes the positioning block By inserting into the positioning grooves at different positions, the angle of the backrest frame can be adjusted, which improves the convenience of adjusting the angle of the backrest frame; by opening sliding grooves at both ends of the sofa frame, fixed rods are embedded in the sliding grooves, and the user's back pushes the backrest frame to move horizontally synchronously when adjusting the angle, and drives the telescopic rod and the support rod to move synchronously during the movement. During the movement, the telescopic rod slides in the support rod, and the first spring is squeezed and deformed during the sliding process. When the user's back is separated from the backrest frame, the elastic force of the first spring of the electromagnetic plate is started to push the support rod to reset the backrest frame, which improves the convenience of resetting the backrest frame after the angle is adjusted.

[0010] Preferably, both ends of the sofa frame are provided with sliding grooves, and fixing rods are embedded in the two sliding grooves.

[0011] Furthermore, armrests are rotatably mounted on both ends of the backrest frame, and a button for controlling the electromagnetic plate is fixed to the top of the armrest.

[0012] Furthermore, telescopic rods are fixedly mounted on the bottom ends of the two armrests, and a support rod is slidably sleeved on the bottom ends of the telescopic rods.

[0013] Furthermore, the support rod is slidably sleeved on the fixing rod, and the fixing rod is sleeved with a first spring that abuts against the support rod.

[0014] Furthermore, the positioning block is provided with a protrusion that abuts against the inner wall of the telescopic slot, and a magnetic suction rod is fixed to the bottom end of the positioning block.

[0015] Furthermore, a second spring is embedded in the telescopic slot, and the magnetic attraction rod passes through the second spring and is fixed by attraction with the electromagnetic plate.

[0016] (3) Beneficial effects

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] The utility model has protrusions fixed at both ends of the sofa frame, a rotating shaft rotatably inserted between the two protrusions fixed on the backrest frame, and a second spring in the telescopic groove of the outer wall of the rotating shaft pushes the positioning block to be inserted into the positioning groove of the inner wall of the protrusion, so that the sofa frame and the backrest frame are axially fixed. When adjusting the angle of the backrest frame, the electromagnetic plate is activated by a button, and the electromagnetic plate and the magnetic suction rod are attracted to shrink the positioning block into the telescopic groove, and the rotating shaft is rotated in the protrusion to adjust the angle of the backrest frame. After the adjustment, the electromagnetic valve is closed, and the second spring is activated to push the positioning block to be inserted into the positioning grooves at different positions, so as to adjust the angle of the backrest frame, thereby improving the convenience of adjusting the angle of the backrest frame.

[0019] By opening sliding grooves at both ends of the sofa frame, fixed rods are embedded in the sliding grooves. When the user's back pushes the backrest frame, the armrests move horizontally synchronously when adjusting the angle, and the telescopic rod and the support rod are driven to move synchronously during the movement. During the movement, the telescopic rod slides in the support rod, and the first spring is squeezed and deformed during the sliding process. When the user's back is separated from the backrest frame, the elastic force of the first spring of the electromagnetic plate is activated to push the support rod to reset the backrest frame, thereby improving the convenience of resetting the backrest frame after the angle is adjusted. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 It is a schematic diagram of the structure of the utility model;

[0022] Figure 2 This is a schematic diagram of the cross-sectional structure of the rotating shaft of the utility model;

[0023] Figure 3 For the utility model Figure 1 A schematic diagram of the structure enlargement in the middle;

[0024] Figure 4 For the utility model Figure 2 Enlarged schematic diagram of the structure at point B in the middle.

[0025] The markings in the attached figure are: 1. sofa frame; 2. fixing rod; 3. slide groove; 4. rotating shaft; 5. raised part; 6. backrest frame; 7. armrest; 8. telescopic rod; 9. button; 10. positioning groove; 11. first spring; 12. support rod; 13. positioning block; 14. magnetic rod; 15. second spring; 16. telescopic groove; 17. electromagnetic plate. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] This specific embodiment is a mechanical extension structure of a multifunctional sofa backrest, and its structural schematic diagram is as follows Figure 1 and Figure 2 As shown, the mechanical extension structure of the multifunctional sofa backrest includes a sofa frame 1 and a backrest frame 6 rotatably mounted on the sofa frame 1, protrusions 5 are symmetrically fixed on the sofa frame 1, a rotating shaft 4 rotatably inserted between two protrusions 5 is fixed to the bottom end of the backrest frame 6, a plurality of positioning grooves 10 are provided on the inner wall of the protrusion 5 in a circular array, a telescopic groove 16 is provided on the outer wall of the rotating shaft 4, a positioning block 13 which is clamped with the positioning groove 10 is elastically inserted in the telescopic groove 16, and an electromagnetic plate 17 for contracting the positioning block 13 is fixed to the bottom wall of the telescopic groove 16.

[0028] Slide grooves 3 are provided at both ends of the sofa frame 1, and fixed rods 2 are embedded in the two slide grooves 3. Armrests 7 are rotatably installed at both ends of the backrest frame 6. A button 9 for controlling the electromagnetic plate 17 is fixed to the top of the armrest 7. Telescopic rods 8 are fixedly installed at the bottom ends of the two armrests 7. The bottom ends of the telescopic rods 8 are slidably sleeved with support rods 12. The second spring 15 in the telescopic groove 16 on the outer wall of the rotating shaft 4 pushes the positioning block 13 to fit in the positioning groove 10 on the inner wall of the raised portion 5, so that the sofa frame 1 and the backrest frame 6 are axially fixed. When the angle of the backrest frame 6 is adjusted, the electromagnetic plate 17 is started by the button 9. After the electromagnetic plate 17 and the magnetic suction rod 14 are attracted, the positioning block 13 is retracted into the telescopic groove 16, and the rotating shaft 4 is rotated in the raised portion 5 to adjust the angle of the backrest frame 6.

[0029] like Figure 3 and Figure 4As shown, the support rod 12 is slidably sleeved on the fixed rod 2, and the fixed rod 2 is sleeved with a first spring 11 that abuts against the support rod 12, and the positioning block 13 is provided with a protrusion 5 that abuts against the inner wall of the telescopic groove 16, and a magnetic rod 14 is fixed to the bottom end of the positioning block 13, and a second spring 15 is embedded in the telescopic groove 16. The magnetic rod 14 passes through the second spring 15 and is fixed by suction with the electromagnetic plate 17, pushing the backrest frame 6 to move the armrest 7 synchronously laterally when the angle is adjusted, and drives the telescopic rod 8 and the support rod 12 to move synchronously during the movement. During the movement, the telescopic rod 8 slides in the support rod 12, and squeezes the first spring 11 to deform during the sliding process. When the user's back is separated from the backrest frame 6, the elastic force of the first spring 11 of the electromagnetic plate 17 is started to push the support rod 12 to reset the backrest frame 6.

[0030] The cross-sectional structure diagram of the rotating shaft 4 of the mechanical extension structure of the multifunctional sofa backrest is as follows Figure 2 As shown, its Figure 1 The enlarged schematic diagram of the structure at A is as follows Figure 3 As shown, its Figure 2 The enlarged schematic diagram of the structure at B is as follows Figure 4 shown.

[0031] Working principle: When the mechanical extension structure of the multifunctional sofa backrest of the present technical solution is used, the electromagnetic plate 17 is activated by the button 9. After the electromagnetic plate 17 and the magnetic suction rod 14 are attracted, the positioning block 13 is retracted into the telescopic groove 16. When the user's back pushes the backrest frame 6, the armrest 7 moves laterally synchronously when adjusting the angle, and the rotating shaft 4 rotates in the protrusion 5 to adjust the angle of the backrest frame 6. After the adjustment, the electromagnetic valve is closed, and the second spring 15 is elastically pushed to push the positioning block 13 to be inserted into the positioning groove 10 at different positions, thereby adjusting the angle of the backrest frame 6. During the movement, the telescopic rod 8 and the support rod 12 are driven to move synchronously. At the same time, the telescopic rod 8 slides in the support rod 12, and the first spring 11 is squeezed and deformed during the sliding process. When the user's back is separated from the backrest frame 6, the elastic force of the first spring 11 of the electromagnetic plate 17 is activated to push the support rod 12 to reset the backrest frame 6, thereby improving the convenience of resetting the backrest frame 6 after the angle is adjusted.

[0032] All technical features in this embodiment can be freely combined according to actual needs.

[0033] Finally, it should be noted that the above is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A mechanical extension structure for a multifunctional sofa backrest, comprising a sofa frame (1) and a backrest frame (6) rotatably mounted on the sofa frame (1), characterized in that: The sofa frame (1) is symmetrically fixed with raised parts (5), the bottom end of the backrest frame (6) is fixed with a rotating shaft (4) which is rotatably inserted between the two raised parts (5), the inner wall of the raised part (5) is provided with a plurality of positioning grooves (10) in a ring array, the outer wall of the rotating shaft (4) is provided with a telescopic groove (16), a positioning block (13) which is engaged with the positioning groove (10) is elastically inserted in the telescopic groove (16), and an electromagnetic plate (17) for contracting the positioning block (13) is fixed to the bottom wall of the telescopic groove (16).

2. The mechanical extension structure of a multifunctional sofa backrest according to claim 1, characterized in that: Both ends of the sofa frame (1) are provided with sliding grooves (3), and fixing rods (2) are embedded in the two sliding grooves (3).

3. The mechanical extension structure of a multifunctional sofa backrest according to claim 2, characterized in that: Armrests (7) are rotatably mounted on both ends of the backrest frame (6), and a button (9) for controlling an electromagnetic plate (17) is fixed on the top of the armrest (7).

4. The mechanical extension structure of a multifunctional sofa backrest according to claim 3, characterized in that: A telescopic rod (8) is fixedly mounted at the bottom ends of the two handrails (7), and a support rod (12) is slidably sleeved at the bottom ends of the telescopic rods (8).

5. The mechanical extension structure of a multifunctional sofa backrest according to claim 4, characterized in that: The support rod (12) is slidably sleeved on the fixed rod (2), and the fixed rod (2) is sleeved with a first spring (11) that abuts against the support rod (12).

6. The mechanical extension structure of a multifunctional sofa backrest according to claim 1, characterized in that: The positioning block (13) is provided with a protrusion (5) abutting against the inner wall of the telescopic slot (16), and a magnetic attraction rod (14) is fixed to the bottom end of the positioning block (13).

7. The mechanical extension structure of a multifunctional sofa backrest according to claim 6, characterized in that: A second spring (15) is embedded in the telescopic groove (16), and the magnetic attraction rod (14) passes through the second spring (15) and is fixedly attracted to the electromagnetic plate (17).

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