Bottom telescopic adjusting frame for electric sofa and use method of bottom telescopic adjusting frame

Abstract

The invention belongs to the technical field of furniture, particularly relates to a bottom telescopic adjusting frame for an electric sofa and a use method of the bottom telescopic adjusting frame, and provides the following scheme aiming at the problems that the length of an existing sofa is generally inconvenient to adjust, and the existing sofa is inconvenient to use at home. A plurality of first splicing strips are fixedly installed in the U-shaped frame at equal intervals in a mortise and tenon joint mode, the edge strip is located on one side of the U-shaped frame, a plurality of second splicing strips are fixedly installed on one side of the edge strip at equal intervals in a mortise and tenon joint mode, and the first splicing strips are in sliding fit with the second splicing strips correspondingly. According to the sofa frame, the distance between the two armrest frames can be adjusted by starting the mute motor according to actual needs, so that the length of the sofa frame can be adjusted according to the actual needs in actual use, free adjustment can be realized in the daily use process, and the sofa frame has good use convenience.

Description

Technical Field

[0001] The present invention relates to the technical field of furniture, and particularly relates to a bottom telescopic adjustment frame for an electric sofa and its usage method. Background Art

[0002] A sofa is a multi-seat chair with cushions, a backrest chair equipped with springs or thick foam plastics, etc., with armrests on both sides. It is a type of soft furniture, generally placed in the living room for daily rest, receiving guests or chatting. According to functions, it can be divided into functional sofas, fixed-back sofas, infinitely adjustable sofas, pneumatic sofas (i.e., manual sofas), electric sofas, and sofas with a TV, etc.;

[0003] Currently, except for electric sofas that can be electrically adjusted in angle for convenient reclining, the lengths of other types of sofas cannot be adjusted. When receiving guests and sitting, due to the fixed length of the sofa, the number of people who can sit on it is limited. Sometimes when there are more people, there will be a problem that the sofa seats are not enough. If a larger-sized sofa is used, it will occupy a larger area. When more seats are not needed, the room will appear crowded and inconvenient to use. Therefore, we propose a bottom telescopic adjustment frame for an electric sofa and its usage method to solve the above-mentioned problems. Summary of the Invention

[0004] The purpose of the present invention is to solve the disadvantages in the prior art that the length of the current sofa generally cannot be conveniently adjusted and it is not convenient for home use, and to propose a bottom telescopic adjustment frame for an electric sofa and its usage method.

[0005] In order to achieve the above purpose, the present invention adopts the following technical scheme:

[0006] A bottom telescopic adjustment frame for an electric sofa includes a U-shaped frame. A plurality of first splicing strips are fixedly installed at equal intervals inside the U-shaped frame by means of mortise and tenon joints. It also includes a side strip on one side of the U-shaped frame. A plurality of second splicing strips are fixedly installed at equal intervals on one side of the side strip by means of mortise and tenon joints. The plurality of first splicing strips are respectively slidably matched with the plurality of second splicing strips, capable of realizing the length adjustment of the sofa frame. Connection strips are fixedly installed on the mutually remote sides of the U-shaped frame and the side strip by bolts. Armrest frames are fixedly installed on the connection strips by means of mortise and tenon joints. This adjustment frame further includes:

[0007] A driving mechanism, which is respectively connected to the two armrest frames and is used to adjust the distance between the two armrest frames;

[0008] A backrest mechanism, which is respectively connected to the top side of one side of the U-shaped frame and the top side of one side of the side strip.

[0009] In a possible design, the same support frame is fixedly installed on the bottom of one side of multiple first splicing bars through bolts. The U-shaped frame is connected to the top of the support frame through multiple bolts. One side of the bottom of the support frame is fixedly installed with a fixed frame by means of mortise and tenon connection. One side of the fixed frame is fixedly connected to the bottom of one side of the armrest frame on one side by means of mortise and tenon. The driving mechanism is respectively connected to the support frame and the fixed frame.

[0010] In a possible design, two rotating frames are symmetrically rotatably connected to the bottom of the armrest frame and the bottom of the support frame, and a support ball is rotatably connected to the rotating frame through a pin shaft. The rotation direction of the rotating frame and the rotation direction of the support ball are set at an angle of 90°.

[0011] In a possible design, a mounting strip is welded inside the armrest frame. One side of the mounting strip is rotatably connected to a rotating plate through a pin shaft. A moving plate is slidably connected through the bottom inner wall of the armrest frame. A brake plate is fixedly installed at the bottom of the moving plate. The brake plate is in contact with the ground, which can brake the armrest frame. A rectangular frame is fixedly installed at the top of one side of the moving plate by welding. A stop shaft is welded to one side of the rotating plate. One side of the stop shaft extends into the rectangular frame, and the stop shaft is in transmission cooperation with the rectangular frame.

[0012] In a possible design, a plug rod is slidably connected through the rotating plate. A slot is opened at the bottom of one side of the armrest frame. One end of the plug rod is inserted into the corresponding slot and is clamped with the inner wall of the slot to position the rotating plate. A first tension spring is sleeved on the plug rod. Both ends of the first tension spring are welded to one side of the rotating plate and one side of the plug rod respectively.

[0013] In a possible design, the driving mechanism includes two threaded pipes and two screw rods. Both threaded pipes are rotatably connected to the mounting strip on one side. Both screw rods are symmetrically welded to one side of the two mounting strips. The thread directions on the two screw rods are opposite. A support plate is fixedly installed inside the support frame by means of mortise and tenon connection. Both threaded pipes penetrate through the support plate and are rotatably connected to the support plate. One end of the screw rod is inserted into the corresponding threaded pipe, and the screw rod is threadedly connected to the inner wall of the threaded pipe. A power assembly is installed on one side of the top of the fixed frame. The power assembly is respectively connected to the two threaded pipes.

[0014] In a possible design, the power assembly includes a mounting plate welded to one side of the top of the fixed frame. A silent motor is fixedly installed on the top of the mounting plate through bolts. A driving gear is fixedly sleeved on the output shaft of the silent motor by means of key connection. A driven gear is fixedly sleeved on the threaded pipe by means of key connection. The driving gear meshes with the two driven gears respectively.

[0015] In a possible design, the backrest mechanism includes a first support arm and a second support arm, the first support arm is rotatably connected to the top of the side bar, and the second support arm is rotatably connected to one side of the top of the U-shaped frame, and multiple connecting tubes are welded at equal intervals on one side of the first support arm, and a connecting rod is slidably connected in the connecting tube, and one end of the multiple connecting rods extends to the outside of the corresponding connecting tube and is welded to one side of the second support arm, and a transmission plate is fixedly installed by a pin on the side where the first support arm and the second support arm are away from each other, and a clamping rod is slidably connected through the transmission plate, and the armrest frame is fixedly installed with an arc plate by a mortise and tenon connection, and the bottom of the arc plate is fixedly connected to the top of the corresponding connecting strip by mortise and tenon, and a plurality of clamping holes are opened at equal intervals on the arc plate, and the clamping rod is movably clamped with the multiple clamping holes, and a second tension spring is sleeved on the clamping rod, and the two ends of the second tension spring are respectively welded to the transmission plate and one side of the clamping rod.

[0016] A method for using a bottom telescopic adjustment frame for an electric sofa, applied to the bottom telescopic adjustment frame for the electric sofa as described above, comprises the following steps:

[0017] S1. When adjusting the length of the sofa frame, the silent motor can be started to drive the driving gear to rotate. At this time, under the meshing transmission action with the two driven gears, the two threaded tubes can be driven to rotate, thereby driving the corresponding screws to move horizontally, so as to adjust the distance between the two armrest frames. When the two armrest frames move, the first splicing strip and the second splicing strip can slide relative to each other, thereby adjusting the length of the sofa frame;

[0018] S2. After the adjustment is completed, the stopper shaft can be driven to move downward in an arc shape by pushing the rotating plate downward. At this time, the stopper shaft and the rectangular frame cooperate with each other to drive the movable plate downward. When the rotating plate is rotated to the vertical position, the brake plate can be closely contacted with the ground, thereby achieving positioning and braking of the handrail frame;

[0019] S3. When the rotating plate is rotated to a vertical position, the brake plate is in close contact with the ground. At this time, the insertion rod can correspond to the position of the slot. When the insertion rod is released, the first tension spring in a stressed state can pull the insertion rod to move, so that the insertion rod is inserted into the slot, thereby positioning the rotating plate and further braking the brake plate to make the brake plate in close contact with the ground.

[0020] S4. After adjusting the distance between the two armrest frames, the connecting tube can slide with the corresponding connecting rod, and the angles of the first support arm and the second support arm can be adjusted by moving the two transmission plates, so that when supporting the back of a person, the angle can be adjusted according to the user's comfort.

[0021] S5. After the angle adjustment of the first support arm and the second support arm is completed, the two clamping rods can be released. The two second tension springs in a stressed state can pull the corresponding clamping rods to move, so that the clamping rods pass through the corresponding clamping holes and are positioned and clamped with the arc-shaped plate, thereby braking and limiting the first support arm and the second support arm, and then the sofa cushion that is compatible with the sofa frame is laid on the sofa frame.

[0022] In the present invention, the bottom telescopic adjustment frame for an electric sofa can be driven by a driving mechanism to rotate two threaded tubes by activating a power assembly. At this time, under the thread transmission action of the corresponding screw rod, the screw rod can be driven to move laterally, thereby adjusting the distance between the two armrest frames, thereby adjusting the length of the sofa frame.

[0023] In the present invention, the bottom telescopic adjustment frame for an electric sofa can slide between the connecting pipe and the corresponding connecting rod after adjusting the distance between the two armrest frames through the backrest mechanism, and the angle of the first support arm and the second support arm can be adjusted by bending the two transmission plates, so that when supporting the back of a person, the angle can be adjusted according to the angle adapted to the user. After the adjustment is completed, the two clamping rods can be released, and the two second tension springs in a stressed state can pull the corresponding clamping rods to move, so that the clamping rods pass through the corresponding clamping holes and are positioned and clamped with the arc-shaped plates, thereby braking and limiting the first support arm and the second support arm.

[0024] The present invention can adjust the distance between the two armrest frames by starting the silent motor according to actual needs, so that the length of the sofa frame can be adjusted according to actual needs during actual use, so that free adjustment can be achieved during daily use, so it has good convenience of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a three-dimensional schematic diagram of the first-view structure of a bottom telescopic adjustment frame for an electric sofa proposed by the present invention;

[0026] Figure 2 This is a three-dimensional schematic diagram of the second perspective structure of a bottom telescopic adjustment frame for an electric sofa proposed by the present invention;

[0027] Figure 3 This is a three-dimensional schematic diagram of the tensile structure of the bottom telescopic adjustment frame for an electric sofa proposed by the present invention;

[0028] Figure 4Three-dimensional schematic diagram of the connection structure of the U-shaped frame, multiple first splicing strips, support frame and armrest frame of the bottom telescopic adjustment frame for an electric sofa proposed by the present invention;

[0029] Figure 5 Three-dimensional schematic diagram of the connection structure of the side strip, armrest frame, multiple second splicing strips and multiple connecting pipes of the bottom telescopic adjustment frame for an electric sofa proposed by the present invention;

[0030] Figure 6 Three-dimensional schematic diagram of the connection structure of the U-shaped frame, support frame, fixed frame, silent motor, driving gear, two threaded pipes, two screw rods and two driven gears of the bottom telescopic adjustment frame for an electric sofa proposed by the present invention;

[0031] Figure 7 Three-dimensional schematic diagram of the connection structure of the rotating plate, blocking shaft, moving plate and braking plate of the bottom telescopic adjustment frame for an electric sofa proposed by the present invention.

[0032] In the figure: 1, U-shaped frame; 2, first splicing strip; 3, side strip; 4, second splicing strip; 5, armrest frame; 6, connecting strip; 7, mounting strip; 8, rotating plate; 9, moving plate; 10, blocking shaft; 11, rectangular frame; 12, inserting rod; 13, first tension spring; 14, braking plate; 15, support frame; 16, rotating frame; 17, supporting ball; 18, fixed frame; 19, mounting plate; 20, threaded pipe; 21, screw rod; 22, silent motor; 23, driving gear; 24, driven gear; 25, first support arm; 26, second support arm; 27, connecting pipe; 28, connecting rod; 29, transmission plate; 30, clamping rod; 31, support plate; 32, arc-shaped plate; 33, clamping hole; 34, second tension spring. Detailed implementation mode

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0034] Embodiment 1: Refer to Figures 1-7 , a frame includes a U-shaped frame 1, a side strip 3, multiple first splicing strips 2, multiple second splicing strips 4, two armrest frames 5, a driving mechanism, a backrest mechanism, a connecting strip 6 and other parts.

[0035] First, fix and install multiple first splicing strips 2 at equal intervals in the U-shaped frame 1 by means of mortise and tenon connection, and then fix and install multiple second splicing strips 4 at equal intervals on one side of the side strip 3 by means of mortise and tenon connection, so that multiple first splicing strips 2 are respectively in sliding fit with multiple second splicing strips 4, so as to realize the length adjustment of the sofa frame.

[0036] On the sides of the U-shaped frame 1 and the side strip 3 that are away from each other, connecting strips 6 are fixedly installed by bolts, and an armrest frame 5 is fixedly installed on the connecting strip 6 by means of mortise and tenon joints.

[0037] In order to improve the support strength and stability of the sofa frame, the same support frame 15 is fixedly installed by bolts on the bottom side of a plurality of first splicing strips 2. The top of the U-shaped frame 1 and the support frame 15 are connected by bolts in multiple places, and a fixing frame 18 is fixedly installed on the bottom side of one side of the support frame 15 by means of mortise and tenon joints, so that one side of the fixing frame 18 is fixedly connected to the bottom side of one side of the armrest frame 5 located on one side by means of mortise and tenon joints. At the same time, the driving mechanism is respectively connected to the support frame 15 and the fixing frame 18.

[0038] Two rotating frames 16 are symmetrically rotatably connected to the bottom of the armrest frame 5 and the bottom of the support frame 15, and support balls 17 are rotatably connected in the rotating frames 16 by pins. The rotation direction of the rotating frame 16 and the rotation direction of the support ball 17 are set at a 90° angle. In this way, the support balls 17 provided at the bottom of the armrest frame 5 and at the bottom of the support frame 15 can facilitate the movement of the position of the sofa frame, and when the sofa frame is telescopically adjusted, the friction during movement can be reduced.

[0039] An installation strip 7 is welded in the armrest frame 5. A rotating plate 8 is rotatably connected to one side of the installation strip 7 by a pin. A moving plate 9 is slidably connected through the bottom inner wall of the armrest frame 5. The bottom of the moving plate 9 is fixedly installed with a brake plate 14, and the brake plate 14 is in contact with the ground, which can realize the braking of the armrest frame 5. A rectangular frame 11 is fixedly installed on the top of one side of the moving plate 9 by welding. A stop shaft 10 is welded on one side of the rotating plate 8, so that one side of the stop shaft 10 extends into the rectangular frame 11, and the stop shaft 10 is in transmission cooperation with the rectangular frame 11. When the rotating plate 8 is pushed downward, it can drive the stop shaft 10 to move downward in an arc shape. At this time, under the transmission cooperation between the stop shaft 10 and the rectangular frame 11, the moving plate 9 can be driven to move downward. When the rotating plate 8 is rotated to the vertical position, at this time, the brake plate 14 can be in close contact with the ground, so as to realize the positioning and braking of the armrest frame 5.

[0040] The insertion rod 12 is slidably connected through the rotating plate 8 in a penetrating manner. A slot is opened at the bottom of one side of the armrest frame 5, so that one end of the insertion rod 12 is inserted into the corresponding slot and is clamped with the inner wall of the slot to position the rotating plate 8. A first tension spring 13 is sleeved on the insertion rod 12, and the two ends of the first tension spring 13 are respectively welded to one side of the rotating plate 8 and one side of the insertion rod 12. When the rotating plate 8 is rotated to the vertical position, the brake plate 14 is in close contact with the ground. At this time, the insertion rod 12 can correspond to the position of the slot. Then, when the insertion rod 12 is released, the first tension spring 13 in the stressed state can pull the insertion rod 12 to move, so that the insertion rod 12 is inserted into the slot, thereby positioning the rotating plate 8. Further, the brake plate 14 can be braked, so that the brake plate 14 is in close contact with the ground.

[0041] The driving mechanism is composed of two threaded pipes 20 and two screw rods 21, etc. Both of the two threaded pipes 20 are rotatably connected to the mounting strip 7 on one side. Both of the two screw rods 21 are symmetrically welded to one side of the two mounting strips 7. The thread directions on the two screw rods 21 are opposite. The support plate 31 is fixedly installed in the support frame 15 by means of mortise and tenon connection. Both of the two threaded pipes 20 penetrate through the support plate 31 and are rotatably connected to the support plate 31, so that one end of the screw rod 21 is inserted into the corresponding threaded pipe 20, and the screw rod 21 is threadedly connected to the inner wall of the threaded pipe 20. A power assembly is installed on one side of the top of the fixed frame 18, and the power assembly is respectively connected to the two threaded pipes 20. By starting the power assembly to drive the two threaded pipes 20 to rotate, at this time, under the threaded driving action of the corresponding screw rod 21, the screw rod 21 can be driven to move horizontally, thereby adjusting the distance between the two armrest frames 5, and thus adjusting the length of the sofa frame.

[0042] The power assembly is composed of a mounting plate 19, a silent motor 22, a driving gear 23 and two driven gears 24, etc. The mounting plate 19 is welded to one side of the top of the fixed frame 18. The silent motor 22 is fixedly installed on the top of the mounting plate 19 by bolts. The driving gear 23 is fixedly sleeved on the output shaft of the silent motor 22 by means of key connection, and the driven gear 24 is fixedly sleeved on the threaded pipe 20 by means of key connection, so that the driving gear 23 meshes with the two driven gears 24 respectively. By starting the silent motor 22 to drive the driving gear 23 to rotate, at this time, under the meshing and driving action of the two driven gears 24, the two threaded pipes 20 can be driven to rotate, thereby driving the corresponding screw rod 21 to move horizontally, and thus adjusting the distance between the two armrest frames 5.

[0043] This application can be used in the field of furniture technology and can also be used in other fields applicable to this application.

[0044] Example 2: Refer to Figure 1, based on the improvement of embodiment 1: a bottom telescopic adjustment frame for an electric sofa, which is applied to the field of furniture technology, the backrest mechanism is composed of a first support arm 25 and a second support arm 26. The first support arm 25 is rotatably connected to the top of the side bar 3, and the second support arm 26 is rotatably connected to one side of the top of the U-shaped frame 1. A plurality of connecting pipes 27 are welded at equal intervals on one side of the first support arm 25. A connecting rod 28 is slidably connected in the connecting pipe 27. One end of the plurality of connecting rods 28 is respectively extended to the outside of the corresponding connecting pipe 27 and welded to one side of the second support arm 26. A transmission plate 29 is fixedly installed on the side away from each other by a pin shaft. A sliding connection rod 30 passes through the transmission plate 29. The armrest frame 5 is fixedly installed with an arc plate 32 by a mortise and tenon connection. The bottom of the arc plate 32 is fixedly connected to the top of the corresponding connecting bar 6 by mortise and tenon. A plurality of latch holes 33 are provided at equal intervals on the plate 32, so that the latch rod 30 is movably engaged with the plurality of latch holes 33 respectively, and a second tension spring 34 is sleeved on the latch rod 30, and the two ends of the second tension spring 34 are welded to the transmission plate 29 and one side of the latch rod 30 respectively. After adjusting the spacing between the two armrest frames 5, the connecting tube 27 can slide between the corresponding connecting rod 28, and the angle set to the first support arm 25 and the second support arm 26 can be adjusted by bending the two transmission plates 29, so that when supporting people's backs, it can be adjusted according to the angle adapted by the user. After the adjustment is completed, the two latch rods 30 can be released, and the two second tension springs 34 in a stressed state can pull the corresponding latch rod 30 to move, so that the latch rod 30 passes through the corresponding latch hole 33 and is positioned and engaged with the arc plate 32, thereby braking and limiting the first support arm 25 and the second support arm 26.

[0045] The present invention provides a method for using a bottom telescopic adjustment frame for an electric sofa, which is applied to the bottom telescopic adjustment frame for the electric sofa as described above, and includes the following steps:

[0046] S1. When adjusting the length of the sofa frame, the silent motor 22 can be started to drive the driving gear 23 to rotate. At this time, under the meshing transmission action with the two driven gears 24, the two threaded tubes 20 can be driven to rotate, thereby driving the corresponding screw 21 to move laterally, so that the distance between the two armrest frames 5 can be adjusted. When the two armrest frames 5 move, the first splicing strip 2 and the second splicing strip 4 can slide against each other, thereby adjusting the length of the sofa frame;

[0047] S2. After the adjustment is completed, the stopper shaft 10 can be driven to move downward in an arc shape by pushing the rotating plate 8 downward. At this time, the stopper shaft 10 and the rectangular frame 11 cooperate with each other in transmission, and the movable plate 9 can be driven downward. When the rotating plate 8 is rotated to the vertical position, the brake plate 14 can be closely contacted with the ground, thereby achieving positioning and braking of the handrail frame 5;

[0048] S3. When the rotating plate 8 is rotated to the vertical position, the brake plate 14 is in close contact with the ground. At this time, the insertion rod 12 can correspond to the slot position. Then, when the insertion rod 12 is released, the first tension spring 13 in the stressed state can pull the insertion rod 12 to move, so that the insertion rod 12 is inserted into the slot, thereby positioning the rotating plate 8. Further, the brake plate 14 can be braked to make the brake plate 14 in close contact with the ground;

[0049] S4. After adjusting the distance between the two armrest frames 5, the connecting tube 27 and the corresponding connecting rod 28 can slide, and the angles of the first support arm 25 and the second support arm 26 can be adjusted by moving the two transmission plates 29. In this way, when supporting the back of a person, the angle can be adjusted according to the user's comfort.

[0050] S5. After the angle adjustment of the first support arm 25 and the second support arm 26 is completed, the two clamping rods 30 can be released. The two second tension springs 34 in a stressed state can pull the corresponding clamping rods 30 to move, so that the clamping rods 30 pass through the corresponding clamping holes 33 and are positioned and clamped with the arc-shaped plate 30, thereby braking and limiting the first support arm 25 and the second support arm 26, and then the sofa cushion that is compatible with the sofa frame is laid on the sofa frame.

[0051] However, as is well known to those skilled in the art, the working principle and wiring method of the silent motor 22 are commonplace, and are conventional means or common knowledge, and will not be elaborated here. Those skilled in the art can make any selection according to their needs or convenience.

[0052] The drawings in this application are for illustrative purposes only. The sizes and shapes of the components shown are not intended to be limiting, but are merely for illustrative purposes. In actual implementation, the components may be appropriately configured and adjusted based on specific needs and actual conditions.

[0053] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A bottom telescopic adjustment frame for an electric sofa, comprising a U-shaped frame (1), in which a plurality of first splicing strips (2) are fixedly installed at equal intervals by means of mortise and tenon joints. It also includes a side strip (3) located on one side of the U-shaped frame (1). On one side of the side strip (3), a plurality of second splicing strips (4) are fixedly installed at equal intervals by means of mortise and tenon joints. The plurality of first splicing strips (2) are respectively in sliding fit with the plurality of second splicing strips (4), capable of realizing the length adjustment of the sofa frame. It is characterized in that, On the sides of the U-shaped frame (1) and the side strip (3) that are away from each other, connecting strips (6) are fixedly installed by bolts. An armrest frame (5) is fixedly installed on the connecting strip (6) by means of mortise and tenon connection. The adjustment frame further includes: A driving mechanism, which is respectively connected to the two armrest frames (5), and the driving mechanism is used to adjust the distance between the two armrest frames (5); A backrest mechanism, which is respectively connected to the top side of the U-shaped frame (1) and the top side of the side strip (3).

2. The bottom telescopic adjustment frame for an electric sofa according to claim 1, wherein The bottom of a plurality of first splicing strips (2) is fixedly installed with the same support frame (15) on one side by bolts. The U-shaped frame (1) is connected to the top of the support frame (15) by a plurality of bolts. One side of the bottom of the support frame (15) is fixedly installed with a fixing frame (18) by means of mortise and tenon connection. One side of the fixing frame (18) is fixedly connected to the bottom of one side of the armrest frame (5) located on one side by means of mortise and tenon. The driving mechanism is respectively connected to the support frame (15) and the fixing frame (18).

3. The bottom telescopic adjustment frame for an electric sofa according to claim 1, characterized in that, Two rotating frames (16) are symmetrically rotatably connected to the bottom of the armrest frame (5) and the bottom of the support frame (15). And a support ball (17) is rotatably connected to the rotating frame (16) through a pin shaft. The rotation direction of the rotating frame (16) is set at a 90° angle to the rotation direction of the support ball (17).

4. The bottom telescopic adjustment frame for an electric sofa according to claim 1, characterized in that, An installation strip (7) is welded inside the armrest frame (5). One side of the installation strip (7) is rotatably connected to a rotating plate (8) through a pin shaft. A moving plate (9) is slidably connected through the bottom inner wall of the armrest frame (5). A braking plate (14) is fixedly installed at the bottom of the moving plate (9). The braking plate (14) is in contact with the ground, which can realize braking of the armrest frame (5). One side of the top of the moving plate (9) is fixedly installed with a rectangular frame (11) by welding. A stop shaft (10) is welded to one side of the rotating plate (8). One side of the stop shaft (10) extends into the rectangular frame (11). The stop shaft (10) is in transmission cooperation with the rectangular frame (11).

5. The bottom telescopic adjustment frame for an electric sofa according to claim 4, characterized in that, A plug rod (12) is slidably connected through the rotating plate (8). A slot is opened at the bottom of one side of the armrest frame (5). One end of the plug rod (12) is inserted into the corresponding slot and is clamped with the inner wall of the slot to realize positioning of the rotating plate (8). A first tension spring (13) is sleeved on the plug rod (12). The two ends of the first tension spring (13) are respectively welded to one side of the rotating plate (8) and one side of the plug rod (12).

6. The bottom telescopic adjustment frame for an electric sofa according to claim 2, characterized in that, The driving mechanism includes two threaded tubes (20) and two screw rods (21). Both of the two threaded tubes (20) are rotatably connected to the mounting strip (7) located on one side. Both of the two screw rods (21) are symmetrically welded to one side of the two mounting strips (7). The thread directions on the two screw rods (21) are opposite. A support plate (31) is fixedly installed inside the support frame (15) by means of mortise and tenon connection. Both of the two threaded tubes (20) penetrate through the support plate (31) and are rotatably connected to the support plate (31). One end of the screw rod (21) is inserted into the corresponding threaded tube (20), and the screw rod (21) is threadedly connected to the inner wall of the threaded tube (20). A power assembly is installed on one side of the top of the fixing frame (18), and the power assembly is respectively connected to the two threaded tubes (20).

7. The bottom telescopic adjustment frame for an electric sofa according to claim 6, characterized in that, The power assembly includes a mounting plate (19) welded to one side of the top of the fixing frame (18). A silent motor (22) is fixedly installed on the top of the mounting plate (19) by bolts. A driving gear (23) is fixedly sleeved on the output shaft of the silent motor (22) by means of key connection. A driven gear (24) is fixedly sleeved on the threaded tube (20) by means of key connection. The driving gear (23) meshes with the two driven gears (24) respectively.

8. The bottom telescopic adjustment frame for an electric sofa according to claim 1, characterized in that, The backrest mechanism includes a first support arm (25) and a second support arm (26). The first support arm (25) is rotatably connected to the top of the side bar (3). The second support arm (26) is rotatably connected to one side of the top of the U-shaped frame (1). A plurality of connecting tubes (27) are equally spaced and welded to one side of the first support arm (25). A connecting rod (28) is slidably connected inside the connecting tube (27). One ends of the plurality of connecting rods (28) respectively extend to the outside of the corresponding connecting tubes (27) and are all welded to one side of the second support arm (26). Transmission plates (29) are fixedly installed on the sides where the first support arm (25) and the second support arm (26) are far away from each other by pin shafts. A clamping rod (30) is slidably connected through the transmission plate (29). An arc-shaped plate (32) is fixedly installed on the armrest frame (5) by means of mortise and tenon connection. The bottom of the arc-shaped plate (32) is mortise-fixedly connected to the top of the corresponding connecting strip (6). A plurality of clamping holes (33) are equally spaced on the arc-shaped plate (32). The clamping rods (30) are respectively movably clamped with the plurality of clamping holes (33). A second tension spring (34) is sleeved on the clamping rod (30), and both ends of the second tension spring (34) are welded to one side of the transmission plate (29) and the clamping rod (30) respectively.

9. A method of using a bottom telescopic adjustment frame for an electric sofa, which is applied to the bottom telescopic adjustment frame for an electric sofa as described in any one of claims 1-8, characterized in that, It includes the following steps: S1. When adjusting the length of the sofa frame, the silent motor (22) can be started to drive the driving gear (23) to rotate. At this time, under the meshing transmission action with the two driven gears (24), the two threaded tubes (20) can be driven to rotate, thereby driving the corresponding screw rods (21) to move horizontally, thereby adjusting the distance between the two armrest frames (5). When the two armrest frames (5) move, the first splicing strip (2) and the second splicing strip (4) can slide against each other, thereby adjusting the length of the sofa frame. S2. After the adjustment is completed, the stopper shaft (10) can be driven to move downward in an arc shape by pushing the rotating plate (8) downward. At this time, the stopper shaft (10) and the rectangular frame (11) can drive the movable plate (9) to move downward. When the rotating plate (8) is rotated to a vertical position, the brake plate (14) can be brought into close contact with the ground, thereby achieving positioning and braking of the handrail frame (5); S3, when the rotating plate (8) is rotated to a vertical position, the brake plate (14) is in close contact with the ground, and the insertion rod (12) can correspond to the slot position. When the insertion rod (12) is released, the first tension spring (13) in a stressed state can pull the insertion rod (12) to move, so that the insertion rod (12) is inserted into the slot, thereby positioning the rotating plate (8) and further braking the brake plate (14), so that the brake plate (14) is in close contact with the ground; S4. After adjusting the distance between the two armrest frames (5), the connecting pipe (27) and the corresponding connecting rod (28) can slide, and the angles of the first support arm (25) and the second support arm (26) can be adjusted by moving the two transmission plates (29), so that when supporting the back of a person, the angle can be adjusted according to the user's preference; S5. After the angle adjustment of the first support arm (25) and the second support arm (26) is completed, the two clamping rods (30) can be released, and the two second tension springs (34) in a stressed state can pull the corresponding clamping rods (30) to move, so that the clamping rods (30) pass through the corresponding clamping holes (33) and are positioned and clamped with the arc-shaped plate (30), thereby braking and limiting the first support arm (25) and the second support arm (26), and then laying a sofa cushion that is compatible with the sofa frame on the sofa frame.

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