Simple stretching device and sofa

Abstract

The utility model relates to a simple stretching device and sofa, the structure of existing folding stretching device is complicated, influences the use experience, the utility model discloses a support, the rear link assembly of rear installation station is equipped with to the rear edge of support, the front link assembly of front installation station is equipped with to the front edge of support, the front link assembly and rear link assembly between through connecting rod cross -linking and drive rear installation station and front installation station linkage, to make the support switch between the lying posture state and the sitting posture state. Set up connecting rod between the rear link assembly and front link assembly for controlling rear installation station and front installation station, so that rear installation station and front installation station can synchronous linkage, both posture adjustment is convenient, and the operation convenience is improved, and rear installation station and front installation station linkage can be realized by simple structure, and the production maintenance cost is reduced through the simplification structure, and the use experience is improved.

Description

Technical Field

[0001] This utility model relates to the field of furniture, specifically to a folding and extending device and a sofa. Background Technology

[0002] Existing sofas include an extension device, a seat cushion, a backrest, and leg supports. The extension device includes a support frame, the seat cushion is positioned above the support frame, the backrest is movably mounted on a rear mounting position at the rear edge of the support frame, and the leg supports are movably mounted on a front mounting position at the front edge of the support frame. In use, the backrest and leg supports are independently controlled. When the usage status of the extension device needs to be adjusted, the backrest and leg supports need to be adjusted separately. This not only affects the user experience due to the complexity of the adjustment operation, but also makes the installation structure of the backrest and leg supports more complex, increasing production and maintenance costs. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a simple extension device and sofa. A connecting rod is set between the rear and front connecting components used to control the posture of the rear and front installation stations, enabling the rear and front installation stations to move in sync. This facilitates posture adjustment, improves operational convenience, and allows for linkage between the rear and front installation stations using a simple structure. By simplifying the structure, production and maintenance costs are reduced, and the user experience is improved.

[0004] This utility model is achieved through the following method: a simple extension device includes a support frame, a rear connecting component with a rear mounting position on the rear edge of the support frame, and a front connecting component with a front mounting position on the front edge of the support frame. The front and rear connecting components are connected by a connecting rod, which drives the rear and front mounting positions to move together, allowing the support frame to switch between a reclining and sitting position. The connecting rod between the rear and front connecting components, which control the rear and front mounting positions, allows for synchronous linkage between the two positions, enabling rapid switching between sitting and reclining positions. This facilitates posture adjustment, improves operational convenience, and ensures precise coordination between the front and rear mounting positions through synchronous adjustment. Furthermore, the simple connecting rod structure effectively improves the reliability of the linkage, reduces the failure rate, and lowers production and maintenance costs by simplifying the structure, thus enhancing the user experience.

[0005] Preferably, the rear connecting assembly includes an L-shaped rear swing arm. The top end of the rear swing arm forms the rear mounting position, the middle part is rotatably connected to the rear edge of the bracket, and the bottom end is rotatably connected to the corresponding end of the connecting rod. The rear swing arm can swing around its middle part, driving the rear mounting position to pitch and swing through its top end, and its connection to the connecting rod through its bottom end allows the rear swing arm to connect with the front connecting assembly, enabling synchronous adjustment of the front mounting position when adjusting the posture of the rear mounting position.

[0006] Preferably, the rear edge of the bracket is angled upwards to form a rear connecting section. The middle part of the rear swing arm is rotatably connected to the rear connecting section, reserving space below the rear connecting section for the bottom end of the rear swing arm to swing. The rear connecting section and the bracket are an integral structure, ensuring good structural strength between them and meeting the strength requirements for supporting the rear installation position and the rear connecting components. The rotatable connection between the middle part of the rear swing arm and the rear connecting section ensures that both ends of the rear swing arm have a large lever arm, thereby improving the linkage flexibility between the connecting rod and the rear installation position using the lever principle. The upward-angled rear connecting section provides installation space for the rear swing arm, effectively increasing the distance between the rear connecting section and the connecting rod, facilitating the linkage between the connecting rod and the rear swing arm.

[0007] Preferably, when the extension device is in a seated position, the angle between the rear mounting station and the horizontal plane is A, 110°≤A≤120°. When the extension device switches to a lying position, the swing amplitude B of the rear mounting station is 35°≤B≤40°. The tilt amplitude of the rear mounting station is adjustable to accommodate the switching between the lying and seated positions of the extension device. When the extension device is in a seated position, 110°≤A≤120°, the rear mounting station tends to be vertical, providing comfortable support for the user and ensuring the user maintains a seated posture. When the extension device is in a lying position, the rear mounting station can swing downwards by an amplitude B, 35°≤B≤40°, making the rear mounting station tend to be horizontal and convenient for the user to lie down. Parameter B refers to the swing amplitude that the rear mounting station can achieve based on parameter A.

[0008] Preferably, the front connection assembly includes a mounting plate forming the front mounting station and a first hinge rod group and a second hinge rod group bridging the mounting plate and the front edge of the bracket. The first hinge rod group and the second hinge rod group are connected to the mounting plate in a staggered manner so that the mounting plate moves along a differentiated path and drives the front mounting station to switch between a vertical and close-fitting retracted state and a horizontally extended state away from the bracket. The first and second hinge rod groups are connected at both ends to the bracket and the mounting plate, respectively. The middle parts of the first and second hinge rod groups are rotatably connected. By using the limiting guide between the first and second hinge rod groups, the mounting plate is driven to switch precisely between the retracted and extended states in a preset path and preset posture. This ensures that the leg support installed at the front mounting position can be adjusted in a preset path and preset posture, improving adjustment accuracy. It also ensures that the leg support can move synchronously with the backrest installed at the rear mounting position through the connecting rod. This allows the extension device to achieve overall state switching when driven at either the front or rear mounting position, improving operational convenience.

[0009] Preferably, the front edge of the bracket forms a front connecting section by curving upwards at an angle. The bottom end of the front connecting section is connected to the top end of the mounting plate via the first hinge rod group, and the top end of the front connecting section is connected to the bottom end of the mounting plate via the second hinge rod group. The first and second hinge rod groups are respectively connected to the bottom and top ends of the front connecting section, providing support and positioning for both groups. Furthermore, by increasing the distance between the ends of the first and second hinge rod groups, the adjustment sensitivity is improved, ensuring that the mounting plate can drive the front mounting station to switch and adjust along a preset path and in a preset posture. The other ends of the first and second hinge rod groups are respectively connected to different areas of the mounting plate. The first and second hinge rod groups, through independent movement, drive different areas of the mounting plate to move differentially. This allows the mounting plate to move along a preset path and also to adjust its posture through coordinated movement.

[0010] Preferably, the first hinged rod assembly includes a first main rod rotatably connected to the front connecting part and a first secondary rod rotatably connected to the mounting plate. Corresponding ends of the first main rod and the first secondary rod are rotatably connected, and the middle portion of the first main rod is rotatably connected to the corresponding end of the connecting rod. The inner ends of the first main rod and the first secondary rod are freely swaying, allowing the distance between their outer ends to be adjustable, thereby adjusting the distance between the corresponding area of ​​the mounting plate and the bottom end of the front connecting part. The rotatable connection between the middle portion of the first main rod and the corresponding end of the connecting rod allows the front mounting position to move synchronously with the rear mounting position and achieve synchronous adjustment via the connecting rod.

[0011] Preferably, the second hinge rod assembly includes a second main rod rotatably connected to the front connecting part and a second auxiliary rod rotatably connected to the mounting plate. The side of the second main rod near the second auxiliary rod is rotatably connected to the side of the first auxiliary rod near the first main rod, and the corresponding ends of the second main rod and the second auxiliary rod are rotatably connected. The inner ends of the second main rod and the second auxiliary rod can swing freely, making the distance between the outer ends of the second main rod and the second auxiliary rod adjustable, thereby making the distance between the corresponding area of ​​the mounting plate and the top of the front connecting part adjustable. The rotatable connection between the side of the second main rod near the second auxiliary rod and the side of the first auxiliary rod near the first main rod increases the rotatable connection point to achieve linkage control between the first hinge rod assembly and the second hinge rod assembly. This ensures synchronous linkage between the two and limits the range of motion of the first hinge rod assembly and the second hinge rod assembly, ensuring that the mounting plate can move in a preset posture and a preset path.

[0012] Preferably, the bracket is H-shaped, including two parallel side rods arranged front-to-back and a main crossbar spanning the middle sections of the side rods. The front and rear connecting assemblies are in pairs, each mounted on a corresponding end of the side rod. The H-shape of the bracket not only secures the side rods with the main crossbar, ensuring their parallelism and thus guaranteeing a firm connection between the seat cushion, the rear mounting position, and the front mounting position, improving the structural reliability of the extension device, but also effectively simplifies the structure, facilitating processing and maintenance. The front connecting portion is formed from the front end of the side rod, and the rear connecting portion is formed from the rear end of the side rod, facilitating assembly of the bracket with the front and rear connecting assemblies.

[0013] Preferably, the connecting rods are two in number, respectively positioned between the front and rear connecting assemblies on the same side. A secondary crossbar is provided between the connecting rods, and a driving assembly is provided between the main and secondary crossbars. Adjusting the distance between the secondary and main crossbars drives the connecting rods to move back and forth, thereby adjusting the position of the rear and front mounting positions relative to the seat cushion to adjust the posture of the extension device. Both the front and rear connecting assemblies are in pairs, respectively positioned on both sides of the front and rear edges of the support frame. This improves the reliability of supporting the rear and front mounting positions, ensures that the rear and front mounting positions can be adjusted by swing, prevents lateral tilting, and guarantees that the corresponding sections on both sides of the rear and front mounting positions are always at the same height. The corresponding front and rear connecting components are linked through corresponding connecting rods. The corresponding front connecting components are linked through a front installation station, and the corresponding rear connecting components are linked through a rear installation station. This enables synchronous linkage between front connecting components, between rear connecting components, and between front and rear connecting components. The secondary crossbar not only fixes the connecting rods, ensuring synchronous movement of the connecting rods on both sides, but also improves the structural strength.

[0014] Preferably, the drive component is an automatic telescopic component, preferably an electric cylinder or a pneumatic cylinder, which is convenient to use, improves adjustment accuracy, and enhances operational ease. Alternatively, a manual telescopic component can be used, effectively simplifying the extension device structure and reducing costs.

[0015] A sofa includes an extension device, a seat cushion disposed above the support frame, a leg support disposed on the front installation position, and a backrest disposed on the rear installation position. The sofa's posture can be adjusted by adjusting the positions of the leg support and backrest relative to the seat cushion to meet the user's needs in different scenarios and improve the user experience.

[0016] The beneficial effects of this utility model are as follows: A connecting rod is set between the rear connecting component and the front connecting component used to control the rear installation station and the front installation station, so that the rear installation station and the front installation station can be linked synchronously and quickly switch between sitting and lying positions. This not only facilitates posture adjustment and improves operational convenience, but also facilitates the synchronous linkage adjustment of the rear installation station and the front installation station, ensuring precise coordination between the front installation station and the rear installation station. Furthermore, the simple connecting rod structure can realize the linkage between the rear installation station and the front installation station, effectively improving linkage reliability and reducing failure rate. It can also reduce production and maintenance costs and improve user experience by simplifying the structure. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the extension device described in Embodiment 1;

[0018] Figure 2 This is a schematic diagram of the structure of the extension device described in Embodiment 1 when it is in a seated position;

[0019] Figure 3 This is a schematic diagram of the structure of the stretching device described in Embodiment 1 when it is in a lying position;

[0020] Figure 4 This is a structural diagram of the extension device described in Embodiment 1 when using an automatic telescopic component;

[0021] Figure 5 This is a perspective structural diagram of the sofa described in Embodiment 2;

[0022] In the diagram: 1. Bracket, 2. Seat cushion, 3. Backrest, 4. Leg support, 5. Rear connecting assembly, 6. Front connecting assembly, 7. Rear swing arm, 8. Connecting rod, 9. Rear connecting part, 10. Mounting plate, 11. Front connecting part, 12. First main rod, 13. First auxiliary rod, 14. Second main rod, 15. Second auxiliary rod, 16. Side rod, 17. Main crossbar, 18. Secondary crossbar, 19. Front installation station, 20. Rear installation station, 21. Automatic telescopic component, 22. Side component. Detailed Implementation

[0023] The essential features of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0024] Example 1:

[0025] This embodiment provides a stretching device.

[0026] like Figure 1 , 2 The extension device shown in Figure 3 includes a support 1, a rear connecting component 5 with a rear mounting station 20 at the rear edge of the support 1, and a front connecting component 6 with a front mounting station 19 at the front edge of the support 1. The front connecting component 6 and the rear connecting component 5 are connected by a connecting rod 8, which drives the rear mounting station 20 and the front mounting station 19 to work together, so that the support 1 can switch between a lying position and a sitting position. A connecting rod 8 is provided between the rear connecting component 5 and the front connecting component 6 used to control the rear installation station 20 and the front installation station 19, so that the rear installation station 20 and the front installation station 19 can be linked synchronously and quickly switch between sitting and lying positions. This not only facilitates posture adjustment and improves operational convenience, but also facilitates the synchronous linkage adjustment of the rear installation station 20 and the front installation station 19, ensuring precise coordination between the front installation station 19 and the rear installation station 20. Furthermore, the simple connecting rod 8 structure can achieve linkage between the rear installation station 20 and the front installation station 19, effectively improving linkage reliability, reducing failure rate, and reducing production and maintenance costs by simplifying the structure, thus improving the user experience.

[0027] In actual operation, the bracket 1 is H-shaped, including two parallel side rods 16 arranged front-to-back and a main crossbar 17 spanning the middle section of the side rods 16. The front connecting assembly 6 and the rear connecting assembly 5 are in pairs and respectively located at the corresponding ends of the side rods 16. Two connecting rods 8 are respectively located between the front connecting assembly 6 and the rear connecting assembly 5 on the same side. A secondary crossbar 18 is provided between the connecting rods 8, and a driving assembly is provided between the main crossbar 17 and the secondary crossbar 18. By adjusting the distance between the secondary crossbar 18 and the main crossbar 17, the connecting rods 8 are driven to move back and forth, thereby adjusting the posture of the extension device by adjusting the positions of the rear mounting position 20 and the front mounting position 19 relative to the seat cushion 2. The front and rear ends of the side rods 16 are bent to form a front connecting part 11 and a rear connecting part 9, respectively, for the installation of the corresponding front connecting assembly 6 and the rear connecting assembly 5. The front connecting components 6 are symmetrically arranged on the front connecting parts 11 on both sides of the bracket 1, serving to connect the front connecting parts 11 and the mounting plate 10. The front connecting components 6 are linked through the mounting plate 10 to adjust the posture and position of the front mounting station 19. The rear connecting components 5 are symmetrically arranged on the rear connecting parts 9 on both sides of the bracket 1, serving to connect the rear connecting parts 9 and the rear mounting station 20. The rear connecting components 5 are linked through the rear mounting station 20 to adjust the posture and position of the rear mounting station 20. Corresponding front connecting components 6 and rear connecting components 5 on the same side of the bracket 1 are connected by a connecting rod 8, enabling the front connecting components 6 and rear connecting components 5 on the same side to move in unison, thereby ensuring that the rear mounting station 20 and the front mounting station 19 move synchronously and achieve precise switching between the lying and sitting positions of the extension device.

[0028] In actual operation, the rear connecting assembly 5 includes an L-shaped rear swing arm 7. The top end of the rear swing arm 7 forms the rear mounting position 20, the middle part is rotatably connected to the rear edge of the bracket 1, and the bottom end is rotatably connected to the corresponding end of the connecting rod 8. The rear edge of the bracket 1 forms a rear connecting part 9 by tilting upwards at an angle. The middle part of the rear swing arm 7 is rotatably connected to the rear connecting part 9 to reserve space below the rear connecting part 9 for the bottom end of the rear swing arm 7 to swing. The middle part of the rear swing arm 7 is rotatably mounted on the tilted rear end of the rear connecting part 9 via a pivot. The top end forms the rear mounting position 20 and can be fixed to the bottom side edge of the backrest 3. The bottom end is connected to the rear end of the connecting rod 8. The rear swing arm 7 can swing around its middle part as the center, thereby controlling the pitch angle of the rear mounting position 20. Specifically:

[0029] When the extension device is switched to a sitting position, the angle between the rear mounting station 20 and the horizontal plane is A, 110°≤A≤120°. The rear mounting station 20 tends to be vertical and the top is moderately tilted backward, which can provide support for users in a sitting position.

[0030] When the extension device is switched to the lying position, the swing amplitude B of the rear mounting station 20 is 35°≤B≤40°. The rear mounting station 20 swings backward and tends to be horizontal, which allows the user in the lying position to lie down and provides support for the user's back.

[0031] In actual operation, when the user drives either the rear mounting station 20 or the front mounting station 19 via the drive assembly, the other component can be synchronously adjusted via the connecting rod 8, ensuring that the extension device can be precisely adjusted and switched between lying and sitting positions. The drive assembly is an automatic telescopic component 21 or a manual telescopic component; the automatic telescopic component 21 is preferably an electric cylinder or a pneumatic cylinder (e.g.,...). Figure 4 As shown, the motor outputs driving force through the transmission component and drives the extension device to achieve state switching. In addition, the driving component can also be a manual extension component, and the user can manually drive the extension device to switch states, which should also be regarded as a specific embodiment of this utility model.

[0032] In actual operation, the front connection assembly 6 includes a mounting plate 10 forming the front mounting station 19, and a first hinge rod group and a second hinge rod group bridging the mounting plate 10 and the front edge of the bracket 1. The first hinge rod group and the second hinge rod group are connected to the mounting plate 10 in a staggered manner, so that the mounting plate 10 moves along a differentiated path and drives the front mounting station 19 to switch between a vertical and close-fitting state against the bracket 1 and an extended state away from the bracket 1 and tending to be horizontal. The front edge of the bracket 1 forms a front connection portion 11 by curving upwards at an angle. The rear end of the front connection portion 11 is connected to the top end of the mounting plate 10 through the first hinge rod group, and the front end of the front connection portion 11 is connected to the bottom end of the mounting plate 10 through the second hinge rod group.

[0033] In actual operation, the first hinge rod group spans between the rear end of the front connecting part 11 and the top end of the mounting plate 10, and adjusts the relative position between the rear end of the front connecting part 11 and the front end of the mounting plate 10. The second hinge rod group spans between the front end of the front connecting part 11 and the bottom end of the mounting plate 10, and adjusts the relative position between the front end of the front connecting part 11 and the rear end of the mounting plate 10. The relative position includes relative distance and relative orientation. In use, since the position of the front connecting part 11 is fixed, the positions of the top and bottom ends of the mounting plate 10 can be adjusted through the first and second hinge rod groups. This allows the mounting plate 10 to adjust the posture and position of the front mounting station 19, enabling the front mounting station 19 to cooperate with the rear mounting station 20 to achieve posture adjustment of the extension device. In use, the top and bottom ends of the mounting plate 10 are adjusted for distance and orientation, respectively, so that the front mounting station 19 can be adjusted along a preset path and with a preset posture under the drive of the mounting plate 10. Specifically, when the relative positions between the top and bottom ends of the mounting plate 10 are fixed and move synchronously back and forth, the front mounting station 19 can be adjusted to move back and forth along a preset path. When the relative positions between the top and bottom ends of the mounting plate 10 change, the posture of the front mounting station 19 is adjusted so that it changes according to the preset posture.

[0034] In actual operation, the first hinge rod assembly includes a first main rod 12 rotatably connected to the front connecting part 11 and a first secondary rod 13 rotatably connected to the mounting plate 10. The corresponding ends of the first main rod 12 and the first secondary rod 13 are rotatably connected, and the middle part of the first main rod 12 is rotatably connected to the corresponding end of the connecting rod 8, so that the relative position between the rear end of the front connecting part 11 and the top end of the mounting plate 10 can be adjusted by relative swinging of the first main rod 12 and the first secondary rod 13. The second hinge rod assembly includes a second main rod 14 rotatably connected to the front connecting part 11 and a second secondary rod 15 rotatably connected to the mounting plate 10. The corresponding ends of the second main rod 14 and the second secondary rod 15 are rotatably connected, so that the relative position between the front end of the front connecting part 11 and the bottom end of the mounting plate 10 can be adjusted by relative swinging of the second main rod 14 and the second secondary rod 15. The second main rod 14 is rotatably connected to the side of the second auxiliary rod 15 near the side of the first auxiliary rod 13 near the first main rod 12. By adding a rotatable connection point, the first hinge rod group and the second hinge rod group are linked for control, ensuring that the mounting plate 10 can move accurately in a preset posture and preset path.

[0035] Example 2:

[0036] This embodiment provides a sofa.

[0037] like Figure 5The sofa shown includes an extension device, a seat cushion 2 mounted on a support frame, a leg support 4 mounted on the front mounting station 19, and a backrest 3 mounted on the rear mounting station 20. The sofa's posture can be adjusted by adjusting the positions of the leg support 4 and the backrest 3 relative to the seat cushion 2 to meet the user's needs in different scenarios and improve the user experience.

[0038] In this embodiment, the leg support 4 is attached and fixed to the mounting plate 10, ensuring that the leg support 4 is firmly installed on the front installation position 19 and can switch between a vertical and attached retracted state and a horizontal unfolded state away from the support 1.

[0039] In this embodiment, the backrest 3 is disposed between the top ends of the rear swing arm 7 and is fixed by fasteners to ensure that the backrest 3 can swing and adjust with the rear edge of the bracket as the center.

[0040] In this embodiment, the top surface of the bracket 1 is a flat surface, which facilitates the stacking of the cushions 2 and their fastening with fasteners.

[0041] Understandably, the support frame is provided below the bracket 1, and the support frame is attached to the ground so that the sofa can be placed stably on the ground, which should also be regarded as a specific implementation of this embodiment.

[0042] Understandably, the sofa includes two vertically placed side members 22, which can be fixed to both sides of the support frame to support the support frame. The side members 22 can be armrests, baffles, etc., and should also be regarded as a specific implementation of this embodiment.

[0043] The other structures and effects of the stretching device described in this embodiment are the same as those in Embodiment 1, and will not be repeated here.

Claims

1. A simple extension device, comprising a support (1), characterized in that, The rear edge of the bracket (1) is provided with a rear connecting component (5) with a rear installation station (20), and the front edge of the bracket (1) is provided with a front connecting component (6) with a front installation station (19). The front connecting component (6) and the rear connecting component (5) are connected by a connecting rod (8) and drive the rear installation station (20) and the front installation station (19) to work together so that the bracket (1) can switch between a lying position and a sitting position.

2. The simple extension device according to claim 1, characterized in that, The rear connecting assembly (5) includes an L-shaped rear swing arm (7), the top end of which forms the rear mounting station (20), the middle part is rotatably connected to the rear edge of the bracket (1), and the bottom end is rotatably connected to the corresponding end of the connecting rod (8).

3. A simple extension device according to claim 2, characterized in that, The rear edge of the bracket (1) is curved upward to form a rear connecting part (9). The middle part of the rear swing rod (7) is rotatably connected to the rear connecting part (9) to reserve space below the rear connecting part (9) for the bottom end of the rear swing rod (7) to swing. Alternatively, when the extension device is in a sitting position, the angle between the rear installation station (20) and the horizontal plane is A, 110°≤A≤120°. When the extension device switches to a lying position, the swing amplitude B of the rear installation station (20) is 35°≤B≤40°.

4. A simple extension device according to claim 1, characterized in that, The front connection assembly (6) includes a mounting plate (10) forming the front mounting station (19) and a first hinge rod group and a second hinge rod group bridging the front edge of the mounting plate (10) and the bracket (1). The first hinge rod group and the second hinge rod group are connected to the mounting plate (10) in a staggered manner so that the mounting plate (10) moves along a differentiated path and drives the front mounting station (19) to switch between a vertical and close-fitting retracted state and a horizontal unfolded state away from the bracket (1).

5. A simple extension device according to claim 4, characterized in that, The front edge of the bracket (1) is curved upward to form a front connecting part (11). The bottom end of the front connecting part (11) is connected to the top end of the mounting plate (10) through the first hinge rod group. The top end of the front connecting part (11) is connected to the bottom end of the mounting plate (10) through the second hinge rod group.

6. A simple extension device according to claim 5, characterized in that, The first hinge rod assembly includes a first main rod (12) rotatably connected to the front connecting part (11) and a first auxiliary rod (13) rotatably connected to the mounting plate (10). The corresponding ends of the first main rod (12) and the first auxiliary rod (13) are rotatably connected, and the middle part of the first main rod (12) is rotatably connected to the corresponding end of the connecting rod (8).

7. A simple extension device according to claim 6, characterized in that, The second hinge rod assembly includes a second main rod (14) rotatably connected to the front connecting part (11) and a second auxiliary rod (15) rotatably connected to the mounting plate (10). The side of the second main rod (14) near the second auxiliary rod (15) is rotatably connected to the side of the first auxiliary rod (13) near the first main rod (12). The corresponding ends of the second main rod (14) and the second auxiliary rod (15) are rotatably connected.

8. A simple extension device according to any one of claims 1-7, characterized in that, The bracket (1) is H-shaped and includes two parallel side rods (16) arranged in a front-to-back direction and a main crossbar (17) spanning the middle section of the side rods (16). The front connecting assembly (6) and the rear connecting assembly (5) are both two sets and are respectively arranged on the corresponding ends of the side rods (16).

9. A simple extension device according to claim 8, characterized in that, The connecting rod (8) consists of two rods respectively located between the front connecting assembly (6) and the rear connecting assembly (5) on the same side. A secondary crossbar (18) is provided between the connecting rods (8). A driving assembly is provided between the main crossbar (17) and the secondary crossbar (18). The connecting rod (8) is driven to move back and forth by adjusting the distance between the secondary crossbar (18) and the main crossbar (17). The driving assembly is an automatic telescopic component (21) or a manual telescopic component.

10. A sofa, characterized in that, The sofa includes the extension device as described in any one of claims 1-9, a seat cushion (2) disposed above the support, a leg support (4) disposed on the front installation station (19), and a backrest (3) disposed on the rear installation station (20), and the sofa posture is adjusted by adjusting the position of the leg support (4) and the backrest (3) relative to the seat cushion (2).

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