A modular sofa that can be used for both sitting and sleeping, allowing for free combination of modules.

Abstract

This utility model relates to the field of modular sofa technology, and discloses a modular sofa that can be used for both sitting and sleeping, which can be freely combined. It includes a sofa base, with a fixed plate slidably connected between the two sides of the inner wall of the sofa base. Four telescopic rods and two hollow sleeves are fixedly connected to the top of the fixed plate. An extension plate is fixedly connected to the top of the four telescopic rods, and a drive frame is fixedly connected to one side of the two hollow sleeves. A drive assembly is provided on the inner wall of the drive frame. This utility model, through the combined use of the telescopic rods, hollow sleeves, extension plate, and drive assembly, enables expansion via the extension plate and worm gear mechanism. Users can easily pull out the extension plate and use the worm gear to drive the lead screw to raise and lower, keeping the extension plate aligned with the plane of the sofa base. This effectively increases the length of the sofa, providing more resting space, and is especially suitable for users who need a larger resting area.

Description

Technical Field

[0001] This utility model relates to the field of modular sofa technology, and in particular to a modular sofa that can be freely combined for both sitting and sleeping. Background Technology

[0002] In modern homes, with changing lifestyles and living spaces, the demand for multifunctional and flexible furniture is increasing. Traditional sofas are mostly limited to seating, failing to meet users' needs in different scenarios. Therefore, modular sofas that can be used as both seats and beds are gradually becoming a popular choice in the market. These sofas can flexibly adjust the functions of the seating and bed according to the user's needs, adapting to different living environments and scenarios.

[0003] However, existing modular sofas still have certain limitations in terms of functional conversion and structural design. Most sofa beds achieve form switching through simple folding or splicing, but the structural stability is poor. Ordinary sofa expansion modules mostly rely on external accessories and cannot be seamlessly connected with the main body. At the same time, some sofas lack sufficient stability and comfort in terms of expansion functions, which may lead to safety issues during use or ineffective use of space. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a modular sofa that can be used for both sitting and sleeping, allowing for free combination of modules.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: a modular sofa that can be used for both sitting and sleeping, comprising a sofa base, a fixed plate slidably connected between the two sides of the inner wall of the sofa base, four telescopic rods and two hollow sleeves fixedly connected to the top of the fixed plate, an extension plate fixedly connected to the top of the four telescopic rods, a drive frame fixedly connected to one side of the two hollow sleeves, a drive assembly provided on the inner wall of the drive frame, connecting assemblies provided on both sides of the sofa base, a hinge assembly provided on the back of the sofa base, a backrest movably placed on the top of the sofa base, two threaded blocks fixedly connected to the back of both the sofa base and the back of the backrest, a fixing assembly provided inside the threaded blocks, two support grooves opened on the back of the backrest, and support assemblies provided inside the support grooves.

[0006] The sofa base, as the main load-bearing component of the entire sofa, provides structural rigidity and integrates all functional modules. It features a built-in sliding rail mechanism that allows the fixed plate to be pulled out horizontally, enabling the sofa width to be expanded. The trapezoidal grooves and trapezoidal blocks on both sides form a modular interface, allowing for the quick assembly of multiple sofa units and providing expansion space. The four telescopic rods are distributed in a rectangle and use synchronous guidance to prevent the expansion plate from tilting. A nylon dust scraper ring is embedded in the inner wall of the hollow sleeve to prevent foreign objects from entering the transmission mechanism during the lifting process.

[0007] As a further description of the above technical solution:

[0008] The drive assembly includes a drive rod rotatably mounted on the inner wall of the drive frame. One end of the drive rod extends through to the outside of the drive frame and is fixedly connected to a drive disk. Two worm gears are fixedly sleeved on the outer wall of the drive rod, and worm wheels are meshed with the outer wall of the worm gears.

[0009] The drive assembly converts rotary input into linear lifting motion, controls the height of the extension plate, and features a worm gear self-locking mechanism. The helix angle between the worm and the worm gear is less than the friction angle, ensuring automatic locking when the extension plate is stationary. The drive disc is a rubber grip disc that provides torque amplification.

[0010] As a further description of the above technical solution:

[0011] The worm gear is internally threaded with a lead screw.

[0012] The top end of the lead screw is fixedly connected to the extension plate, the bottom end of the worm gear is rotatably connected to the top end of the hollow sleeve, and the lead screw penetrates the hollow sleeve and is located inside it.

[0013] As a further description of the above technical solution:

[0014] The connecting component includes a trapezoidal groove and a trapezoidal block. The trapezoidal groove is formed on one side of the sofa base, and the trapezoidal block is fixedly installed on the other side of the sofa base.

[0015] The trapezoidal groove is slidably engaged with a trapezoidal block on another sofa base. Through the trapezoidal cross-section design and the dovetail groove structure that is wider at the top and narrower at the bottom, an interference fit is formed after the slid engagement, which resists lateral shear force.

[0016] As a further description of the above technical solution:

[0017] The hinge assembly includes two hinge seats fixedly installed on the back of the sofa seat. Two connecting rods are hinged inside the hinge seats, and two connecting rods are hinged to the outer wall of the connecting rods. One end of the two connecting rods is hinged to a connecting rod seat.

[0018] One of the connecting rods is hinged at its center to two of the connecting rods. One side of the connecting rod seat is fixedly connected to the back of the backrest. The hinge assembly controls the backrest to rotate 90° to flatten and achieves bistable locking. The connecting rod and the two connecting rods form a parallelogram hinge to ensure the backrest's rotation trajectory is accurate. When the backrest is fully upright or flattened, the linkage mechanism enters the dead point position and relies on the structure to maintain its state.

[0019] As a further description of the above technical solution:

[0020] The fixing assembly includes a threaded rod with threads penetrating inside two threaded blocks, one end of which is fixedly connected to a rotating head.

[0021] The outer wall of the threaded rod is provided with a thread that matches the thread length of the threaded block. The thread is located below the threaded rod on the outer wall of the threaded rod. The diameter of the unthreaded section of the threaded rod is smaller than the outer diameter of the thread to accommodate the sliding fit of the threaded block.

[0022] As a further description of the above technical solution:

[0023] The support assembly includes a support leg that is rotatably mounted in a support groove, and fixing holes are provided on the top of the support leg and the front of the backrest.

[0024] The support components provide additional support in bed mode, distribute the load of the extension plate, and automatically adjust the angle after contact with the ground to adapt to uneven ground.

[0025] As a further description of the above technical solution:

[0026] A fixing pin is movably placed inside the fixing hole.

[0027] The fixing pin penetrates both the support leg and the backrest fixing hole, forming a shear pin structure to prevent pull-out.

[0028] This utility model has the following beneficial effects:

[0029] 1. Compared with existing technologies, this modular sofa, which can be used for both sitting and sleeping, can be freely combined. Through the use of structures such as telescopic rods, hollow sleeves, extension plates, and drive components, it can be expanded through the extension plate and worm gear mechanism. Users can easily pull out the extension plate and drive the lead screw to raise and lower it through the worm gear, so that the extension plate is aligned with the plane of the sofa base. This can effectively increase the length of the sofa and provide more resting space, which is especially suitable for users who need a larger resting area. At the same time, when laid flat, it can also accommodate taller people to sleep.

[0030] 2. Compared with existing technologies, this modular sofa, which can be used as a seat or bed, allows for flexible combination. Through the use of backrests, threaded blocks, hinge components, and fixing components, the modular design allows users to purchase multiple sofa units according to their needs, facilitating flexible combination and disassembly. The sofa base can be connected into a whole through simple operation, thereby expanding the width of the sofa to meet the needs of different family members, greatly improving the customizability and adaptability of the sofa. When converted into a bed, the 90-degree rotation of the backrest and the vertical fixing design of the support legs make the entire conversion process stable and simple. With the expansion plate, it can provide more space. At the same time, when used as a sofa, the backrest can also provide firm support under the action of the fixing components, making it easy to use. Attached Figure Description

[0031] Figure 1 This is a three-dimensional schematic diagram of the overall structure of a modular sofa that can be used for both sitting and sleeping, in its unfolded state, as proposed in this utility model.

[0032] Figure 2 This is a three-dimensional schematic diagram of the overall structure of a modular sofa that can be freely combined for sitting and sleeping, proposed in this utility model, from another perspective.

[0033] Figure 3 A three-dimensional schematic diagram of the overall structure of a modular sofa that can be used for both sitting and sleeping, in a semi-expanded state, as proposed in this utility model.

[0034] Figure 4 A three-dimensional view of the unfolded overall structure of a modular sofa that can be used for both sitting and sleeping, as proposed in this utility model, viewed from below.

[0035] Figure 5 A three-dimensional schematic diagram of the hinge component structure of a modular sofa that can be used for both sitting and sleeping, as proposed in this utility model.

[0036] Figure 6 This is a three-dimensional schematic diagram of the drive component structure of a modular sofa that can be used for both sitting and sleeping, as proposed in this utility model.

[0037] Legend:

[0038] 1. Sofa base; 2. Fixing plate; 3. Telescopic rod; 4. Hollow sleeve; 5. Extension plate; 6. Drive frame; 7. Backrest; 8. Threaded block; 9. Support groove; 10. Drive rod; 11. Drive disc; 12. Worm gear; 13. Worm wheel; 14. Lead screw; 15. Trapezoidal groove; 16. Trapezoidal block; 17. Hinge seat; 18. Link 1; 19. Link 2; 20. Link seat; 21. Threaded rod; 22. Rotating head; 23. Support leg; 24. Fixing hole; 25. Fixing pin. Detailed Implementation

[0039] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0040] Reference Figure 1-6 This utility model provides a modular, freely combinable sofa that can be used for both sitting and sleeping: It includes a sofa base 1, with a fixed plate 2 slidably connected between the two sides of the inner wall of the sofa base 1. Four telescopic rods 3 and two hollow sleeves 4 are fixedly connected to the top of the fixed plate 2. An extension plate 5 is fixedly connected to the top of the four telescopic rods 3. A drive frame 6 is fixedly connected to one side of the two hollow sleeves 4. A drive assembly is provided on the inner wall of the drive frame 6. Connecting assemblies are provided on both sides of the sofa base 1. A hinge assembly is provided on the back of the sofa base 1. A backrest 7 is movably placed on the top of the sofa base 1. Two threaded blocks 8 are fixedly connected to the back of both the sofa base 1 and the backrest 7. A fixing assembly is provided inside the threaded blocks 8. Two support grooves 9 are opened on the back of the backrest 7. Supporting assemblies are provided inside the support grooves 9. The sofa base 1 serves as the main load-bearing structure of the entire sofa, providing structural rigidity and integrating all functions. The sofa features a modular design with a built-in sliding rail mechanism, allowing the fixed plate 2 to be pulled out horizontally to expand the sofa's width. Trapezoidal grooves 15 on both sides and trapezoidal blocks 16 form a modular interface, enabling the quick assembly of multiple sofa units and providing expansion space. Four telescopic rods 3 are arranged in a rectangular pattern, using synchronous guidance to prevent the expansion plate 5 from tilting. A nylon dust scraper ring is embedded in the inner wall of the hollow sleeve 4 to prevent foreign objects from entering the transmission mechanism during lifting. Through the coordinated use of the telescopic rods 3, hollow sleeve 4, expansion plate 5, and drive components, expansion can be achieved via the expansion plate 5 and the worm gear 13 and worm 12 mechanism. Users can easily pull out the expansion plate 5 and use the worm gear 13 and worm 12 to drive the lead screw 14 to lift and lower, ensuring the expansion plate 5 is aligned with the plane of the sofa base 1. This effectively increases the sofa's length, providing more resting space, especially suitable for users who need a larger resting area. When laid flat, it can also accommodate taller individuals for sleeping.

[0041] The drive assembly includes a drive rod 10 rotatably mounted on the inner wall of the drive frame 6. One end of the drive rod 10 extends to the outside of the drive frame 6 and is fixedly connected to a drive disc 11. Two worm gears 12 are fixedly sleeved on the outer wall of the drive rod 10. A worm wheel 13 is meshed with the outer wall of the worm gear 12. The drive assembly converts the rotational input into linear lifting motion to control the height of the extension plate 5. The worm wheel 13 and worm gear 12 are self-locking. The helix angle between the worm gear 12 and the worm wheel 13 is less than the friction angle, ensuring that the extension plate 5 automatically locks when stationary. The drive disc 11 is a rubber grip disc that provides torque amplification. A lead screw 14 is threadedly connected to the inside of the worm wheel 13. The top end of the lead screw 14 is fixedly connected to the extension plate 5, and the bottom end of the worm wheel 13 is rotatably connected to the top end of the hollow sleeve 4. The lead screw 14 penetrates the hollow sleeve 4 and is located inside it.

[0042] The connecting component includes a trapezoidal groove 15 and a trapezoidal block 16. The trapezoidal groove 15 is opened on one side of the sofa base 1, and the trapezoidal block 16 is fixedly installed on the other side of the sofa base 1. The interior of the trapezoidal groove 15 is slidably engaged with the trapezoidal block 16 on another sofa base 1. Through the trapezoidal cross-section design and the dovetail groove structure that is wider at the top and narrower at the bottom, an interference fit is formed after sliding engagement, which resists lateral shear force.

[0043] The hinge assembly includes two hinge seats 17 fixedly installed on the back of the sofa seat. Two connecting rods 18 are hinged inside the hinge seat 17, and two connecting rods 29 are hinged to the outer wall of the connecting rods 18. One end of the two connecting rods 29 is hinged to a connecting rod seat 20. The center of one of the connecting rods 18 is hinged to one of the two connecting rods 29. One side of the connecting rod seat 20 is fixedly connected to the back of the backrest 7. The hinge assembly controls the backrest 7 to rotate 90° to flatten and achieves bistable locking. The connecting rods 18 and the two connecting rods 29 form a parallelogram hinge to ensure the accurate rotation trajectory of the backrest 7. When the backrest 7 is fully upright or flattened, the linkage mechanism enters the dead point position and relies on the structure to maintain the state.

[0044] The fixing component includes a threaded rod 21 with threads penetrating inside the two threaded blocks 8. One end of the threaded rod 21 is fixedly connected to a rotating head 22. The outer wall of the threaded rod 21 is provided with threads that are adapted to the thread length of the threaded blocks 8. The thread is located below and on the outer wall of the threaded rod 21. The diameter of the unthreaded section of the threaded rod 21 is smaller than the outer diameter of the thread to adapt to the sliding fit of the threaded blocks 8.

[0045] The support assembly includes a support leg 23 rotatably mounted in the support groove 9. Fixing holes 24 are provided on the top of the support leg 23 and the front of the backrest 7. The support assembly provides additional support in bed mode, distributes the load of the extension plate 5, and automatically adjusts the angle after contacting the ground to adapt to uneven ground. A fixing pin 25 is movably placed in the fixing hole 24. The fixing pin 25 penetrates both the support leg 23 and the fixing hole 24 of the backrest 7 to form a shear pin structure to resist pull-out.

[0046] Working principle: First, purchase an appropriate number of sofas as needed. When there are at least two sofas, push one of the sofa bases 1 so that the trapezoidal block 16 on one side aligns with the trapezoidal groove 15 on the other sofa. Then push the sofa base 1 to make it slide and lock together, so that the two sofas can be formed as a whole. In the subsequent unfolding process into a bed, it can form a larger area and make the sofa wider to meet the needs of different family members. When it is necessary to unfold into a bed, pull the extension plate 5 so that the fixed plate 2 can be pulled out from the sofa base 1. After the extension plate 5 is fully exposed, rotate the drive plate 11 on the drive frame 6 to make the drive rod 10 rotate, which in turn drives the worm gear 12 fixed to it to rotate. The worm gear 12 drives the worm wheel 13 meshing with it to rotate. The rotation of the worm wheel 13 drives the screw 14 threaded inside the worm wheel 13 to move. Under the limit of the telescopic rod 3 on the extension plate 5, the screw 14 moves up and down, which in turn drives the extension plate 5 to move up and down, so that the extension plate 5 is consistent with the plane of the sofa base 1.

[0047] Then, the operator rotates the rotating head 22, causing the rotating head 22 to drive the threaded rod 21 to rotate, so that the threaded rod 21 contacts and connects with the threaded block 8 on the backrest 7. At this time, the backrest 7 can be pushed to rotate. Under the action of the hinge seat 17, the connecting rod 18 drives the connecting rod 29 to rotate. At the same time, under the action of the hinge of one of the connecting rods 18 and two of the connecting rods 29, the backrest 7 rotates 90 degrees, thus making the backrest 7 flat. Then, the fixing pin 25 in the support leg 23 can be pulled out, and the support leg 23 is placed perpendicular to the ground. Then, the fixing pin 25 is passed through the fixing hole 24 on the backrest 7 and then through the support leg 23, so that the support leg 23 remains perpendicular. At this time, the sofa can be unfolded into a bed. By placing the cushions on the sofa, it can be used for sleeping.

[0048] Finally, it should be noted that the above description 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 foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A modular sofa that can be used for both sitting and sleeping, comprising a sofa base (1), characterized in that: A fixing plate (2) is slidably connected between the two sides of the inner wall of the sofa base (1). Four telescopic rods (3) and two hollow sleeves (4) are fixedly connected to the top of the fixing plate (2). An expansion plate (5) is fixedly connected to the top of the four telescopic rods (3). A drive frame (6) is fixedly connected to one side of the two hollow sleeves (4). A drive assembly is provided on the inner wall of the drive frame (6). A connecting assembly is provided on both sides of the sofa base (1). A hinge assembly is provided on the back of the sofa base (1). A backrest (7) is movably placed on the top of the sofa base (1). Two threaded blocks (8) are fixedly connected to the back of both the sofa base (1) and the backrest (7). A fixing assembly is provided inside the threaded block (8). Two support grooves (9) are opened on the back of the backrest (7). A support assembly is provided inside the support grooves (9).

2. The modular sofa that can be used for both sitting and sleeping, as described in claim 1, is characterized in that: The drive assembly includes a drive rod (10) rotatably mounted on the inner wall of the drive frame (6). One end of the drive rod (10) extends through to the outside of the drive frame (6) and is fixedly connected to a drive disc (11). Two worm gears (12) are fixedly sleeved on the outer wall of the drive rod (10), and worm wheels (13) are meshed with the outer wall of the worm gears (12).

3. A modular sofa that can be used for both sitting and sleeping, as described in claim 2, characterized in that: The worm gear (13) is internally threaded with a lead screw (14).

4. A modular sofa that can be used for both sitting and sleeping, as described in claim 1, characterized in that: The connecting component includes a trapezoidal groove (15) and a trapezoidal block (16). The trapezoidal groove (15) is opened on one side of the sofa base (1), and the trapezoidal block (16) is fixedly installed on the other side of the sofa base (1).

5. A modular sofa that can be used for both sitting and sleeping, as described in claim 1, characterized in that: The hinge assembly includes two hinge seats (17) fixedly installed on the back of the sofa seat. The hinge seats (17) are hinged to two connecting rods (18) inside, and two connecting rods (19) are hinged to the outer wall of the connecting rods (18). One end of the two connecting rods (19) is hinged to a connecting rod seat (20).

6. A modular sofa that can be used for both sitting and sleeping, as described in claim 1, characterized in that: The fixing assembly includes a threaded rod (21) with threads penetrating inside two threaded blocks (8), one end of which is fixedly connected to a rotating head (22).

7. A modular sofa that can be used for both sitting and sleeping, as described in claim 1, characterized in that: The support assembly includes a support leg (23) rotatably mounted in a support groove (9), and fixing holes (24) are provided on the top of the support leg (23) and the front of the backrest (7).

8. A modular sofa that can be used for both sitting and sleeping, as described in claim 7, characterized in that: A fixing pin (25) is movably placed inside the fixing hole (24).

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