Sofa bed

Abstract

The invention provides a sofa bed which comprises a sofa body and a lifting bed, and the lifting bed can move back and forth relative to the sofa body so as to realize switching between a sofa state and a bed body state. The lifting bed comprises a first frame, a second frame capable of lifting relative to the first frame, two groups of lifting mechanisms symmetrically arranged on the left and right sides of the first frame and the second frame, and a locking mechanism; the lifting mechanism is X-shaped, the upper and lower ends of one side of the lifting mechanism are rotatably connected with the second frame and the first frame respectively, and the upper and lower ends of the other side of the lifting mechanism are slidably connected with the second frame and the first frame respectively; a first connecting rod is arranged between the two groups of lifting mechanisms to realize synchronous lifting of the two groups of lifting mechanisms; one end of the locking mechanism is rotationally connected with the front rod of the first frame, and the other end of the locking mechanism is matched with the first connecting rod to limit the lifting mechanism. The X-shaped lifting mechanism is adopted, the second frame is tightly attached to the first frame after the lifting mechanism is folded, the height of the folded lifting mechanism is reduced, and conditions are created for thickening the soft package.

Description

Technical Field

[0001] This invention belongs to the field of home furnishing technology, specifically relating to a sofa bed. Background Technology

[0002] The lift bed of a sofa bed uses an iron and wooden frame as its skeleton and is raised and folded up by a lifting mechanism. When the user uses the sofa, the lift bed is folded up under the sofa seat; when the user uses the bed, the lift bed is pulled out and raised up so that it can be connected with the sofa to form a bed.

[0003] To ensure the comfort of a lift-up sofa bed, it is covered with soft padding. However, with a fixed seat height, the thickness of this padding is limited by the height of the lifting mechanism when the bed is folded up. Currently, in existing lift-up sofa beds, the relatively high height of the lifting mechanism limits the thickness of the padding, resulting in a firmer sitting and lying experience, thus impacting user comfort and overall experience. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a sofa bed that optimizes the design of the lifting and locking mechanisms. By minimizing the height of the lifting mechanism after it is folded up within a limited space, the thickness of the upholstery is maximized, significantly improving the comfort of the sofa bed and enhancing the user experience.

[0005] This invention provides the following technical solution: A sofa bed includes a sofa body and a liftable bed. The liftable bed can move back and forth relative to the sofa body to switch between sofa mode and bed mode. The liftable bed includes a first frame, a second frame that can be raised and lowered relative to the first frame, two sets of lifting mechanisms symmetrically arranged on the left and right sides of the first and second frames, and a locking mechanism for limiting the lifting mechanisms. The lifting mechanism is X-shaped, with its upper and lower ends on one side rotatably connected to the second frame and the first frame, respectively, and its upper and lower ends on the other side slidably connected to the second frame and the first frame, respectively; a first connecting rod is provided between the two sets of lifting mechanisms to realize the synchronous lifting of the two sets of lifting mechanisms. One end of the locking mechanism is rotatably connected to the front rod of the first frame, and the other end of the locking mechanism cooperates with the first connecting rod to limit the lifting mechanism.

[0006] After the X-shaped lifting mechanism is retracted, the second frame can fit snugly against the first frame. This reduces the overall thickness of the retracted lifting mechanism while maintaining structural strength, thus creating conditions for thicker upholstery on the sofa bed. When the lifting mechanism is raised, a locking mechanism secures the first connecting rod, ensuring the reliable load-bearing capacity of the sofa bed after it is extended. Minimizing the retracted height of the lifting mechanism within a limited space maximizes the thickness of the upholstery, significantly improving the comfort of the sofa bed and enhancing the user experience.

[0007] In a preferred embodiment, the lifting mechanism includes a first lifting rod and a second lifting rod, which are rotatably connected at their middle parts. The lower end of the first lifting rod is rotatably connected to a first frame, and the upper end of the first lifting rod is slidably connected to a second frame. The lower end of the second lifting rod is slidably connected to the first frame, and the upper end of the second lifting rod is rotatably connected to the second frame.

[0008] The first and second lifting rods are rotatably connected at the middle, so that the X-shaped lifting mechanism can minimize its height when retracted and stably support the second frame when extended.

[0009] In a preferred embodiment, slide rails are symmetrically arranged on the left and right sides of both the first frame and the second frame. The lower end of the first lifting rod is rotatably connected to the slide rail of the first frame via a rotating shaft, the upper end of the first lifting rod is slidably connected to the slide rail of the second frame via a roller, the lower end of the second lifting rod is slidably connected to the slide rail of the first frame via a roller, and the upper end of the second lifting rod is rotatably connected to the second frame via a rotating shaft.

[0010] By combining the slide rail with the rotating shaft and rollers, the connection between the lifting rod and the frame is transformed into a composite motion of "rotation + sliding", which greatly reduces the frictional resistance during the lifting process.

[0011] In a preferred embodiment, the locking mechanism is provided with a first groove and a second groove, wherein the second groove is located below the first groove; The first groove is used to lock the first connecting rod after the lifting mechanism is raised to limit the lifting mechanism; The second groove is used to accommodate the first connecting rod after the lifting mechanism is retracted.

[0012] When the lifting mechanism retracts, the first connecting rod is located in the second groove. When the lifting mechanism rises, the first connecting rod slides from the second groove to the first groove. When the lifting bed is under force, the first connecting rod is locked by the first groove to prevent the lifting mechanism from falling back under pressure, thus ensuring the stability of the lifting bed after it is raised.

[0013] In a preferred embodiment, the locking mechanism has two sets, which are symmetrically arranged on both sides of the front rod of the first frame.

[0014] In a preferred embodiment, a second link is provided between the two locking mechanisms to achieve synchronous limiting.

[0015] The locking mechanisms are symmetrically distributed and linked by a second linkage, enabling simultaneous locking and unlocking on both sides. Particularly when the lifting mechanism is raised, two locking supports are provided on either side of the first linkage, effectively enhancing the overall structural stability.

[0016] In a preferred embodiment, the locking mechanism is provided with a tension spring for resetting the locking mechanism. The tension spring provides an automatic reset force to the locking mechanism, thereby ensuring that the locking mechanism remains in close contact with the first connecting rod during the raising and lowering of the lifting mechanism.

[0017] In a preferred embodiment, the lifting mechanism is provided with a gas spring for providing lifting driving force.

[0018] In a preferred embodiment, one end of the gas spring is disposed on the first lifting rod near the first frame, and the other end of the gas spring is disposed on the second lifting rod near the second frame.

[0019] Users only need to slightly lift / press down the second frame to trigger the lifting mechanism. The lifting process is effortless and smooth, significantly improving the user experience.

[0020] In a preferred embodiment, both ends of the first connecting rod are fixed to the second lifting rod near the first frame.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows: After the X-shaped lifting mechanism is retracted, the second frame can fit snugly against the first frame. This reduces the overall thickness of the retracted lifting mechanism while maintaining structural strength, thus creating conditions for thicker upholstery on the sofa bed. After the lifting mechanism is raised, a locking mechanism secures the first connecting rod, ensuring the reliable load-bearing capacity of the sofa bed when deployed. This application optimizes the design of the lifting and locking mechanisms, minimizing the retracted height of the lifting mechanism within a limited space to maximize the thickness of the upholstery, significantly improving the comfort of the sofa bed and enhancing the user experience. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the sofa bed when it is in the bed position. Figure 2 A schematic diagram of the overall structure of the sofa bed when it is in sofa mode; Figure 3 A schematic diagram of the overall structure of the sofa bed when it is in the bed position, from another perspective. Figure 4 This is a diagram illustrating the transformation of a sofa bed from its sofa configuration to its bed configuration.

[0023] Explanation of reference numerals in the attached drawings: 1. First frame; 11. Front rod; 2. Second frame; 3. Lifting mechanism; 31. First lifting rod; 32. Second lifting rod; 33. First connecting rod; 34. Rotating shaft; 35. Roller; 36. Gas spring; 4. Locking mechanism; 41. First groove; 42. Second groove; 43. Second connecting rod; 44. Tension spring; 5. Slide rail. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] The present invention will now be described in further detail with reference to the accompanying drawings: This embodiment provides a sofa bed, including a sofa body and a liftable bed. The liftable bed can move back and forth relative to the sofa body to switch between sofa mode and bed mode. The sofa mode is as follows: Figure 2 As shown, the bed condition is as follows Figure 1 As shown, the state transition process is as follows: Figure 4 As shown.

[0026] like Figure 2 and Figure 4 As shown, the lifting bed includes a first frame 1, a second frame 2 that can be raised and lowered relative to the first frame 1, two sets of lifting mechanisms 3 symmetrically arranged on the left and right sides of the first frame 1 and the second frame 2, and a locking mechanism 4 for limiting the lifting mechanism 3.

[0027] The lifting mechanism 3 is X-shaped and includes a first lifting rod 31 and a second lifting rod 32. The first lifting rod 31 and the second lifting rod 32 are hinged in the middle. A first connecting rod 33 is provided between the two sets of lifting mechanisms 3. The two ends of the first connecting rod 33 are fixed to the second lifting rod 32 near the first frame 1 to realize the synchronous lifting of the two sets of lifting mechanisms 3.

[0028] The first frame 1 and the second frame 2 are symmetrically provided with slide rails 5 on both the left and right sides. The lower end of the first lifting rod 31 is rotatably connected to the slide rail 5 of the first frame 1 through a rotating shaft 34. The upper end of the first lifting rod 31 is slidably connected to the slide rail 5 of the second frame 2 through a roller 35. The lower end of the second lifting rod 32 is slidably connected to the slide rail 5 of the first frame 1 through a roller 35. The upper end of the second lifting rod 32 is rotatably connected to the second frame 2 through a rotating shaft 34.

[0029] The lower end of the first lifting rod 31 is fixed at the connection point with the first frame 1, and the upper end of the second lifting rod 32 is fixed at the connection point with the second frame 2. The lifting mechanism 3 achieves lifting and lowering through the rollers 35 at the upper end of the first lifting rod 31 and the lower end of the second lifting rod 32.

[0030] By optimizing the structure of the lifting mechanism 3 and the connection relationship between the lifting mechanism 3 and the first frame 1 and the second frame 2, the second frame 2 can be tightly attached to the first frame 1 after the X-shaped lifting mechanism 3 is retracted. Under the premise of ensuring structural strength, the overall height of the lifting mechanism 3 after retraction is reduced, thereby creating conditions for thickening the soft padding of the lifting bed.

[0031] The lifting mechanism 3 is also equipped with a gas spring 36 to provide lifting driving force. One end of the gas spring 36 is located on the first lifting rod 31 near the first frame 1, and the other end of the gas spring 36 is located on the second lifting rod 32 near the second frame 2. The user only needs to slightly lift / press down the second frame 2 to trigger the movement of the lifting mechanism 3. The lifting process is effortless and smooth, significantly improving the user experience.

[0032] There are two sets of locking mechanisms 4, which are symmetrically arranged on both sides of the front rod 11 of the first frame 1. A second connecting rod 43 is provided between the two sets of locking mechanisms 4 to achieve synchronous limiting.

[0033] One end of the locking mechanism 4 is rotatably connected to the front rod 11 of the first frame 1, and the other end of the locking mechanism 4 cooperates with the first connecting rod 33 to limit the lifting mechanism 3. Specifically: The locking mechanism 4 is provided with a first groove 41 and a second groove 42, with the second groove 42 located below the first groove 41; the first groove 41 is used to lock the first connecting rod 33 after the lifting mechanism 3 is raised to limit the lifting mechanism 3; the second groove 42 is used to accommodate the first connecting rod 33 after the lifting mechanism 3 is retracted.

[0034] After the lifting mechanism 3 is raised, the locking mechanism 4 locks the first connecting rod 33 to ensure the load-bearing reliability of the lifting bed after it is unfolded. After the lifting mechanism 3 is retracted, the second groove 42 accommodates the first connecting rod 33. At this time, the locking mechanism 4 is close to the first connecting rod 33, further reducing the height of the lifting mechanism 3 after it is retracted. By optimizing the design of the lifting mechanism 3 and the locking mechanism 4, the height of the lifting mechanism 3 after it is retracted is minimized within a limited space, thereby maximizing the thickness of the upholstery, significantly improving the comfort of the sofa bed and enhancing the user experience.

[0035] To ensure that the locking mechanism 4 remains in close contact with the first connecting rod, a tension spring 44 is provided on the locking mechanism 4 for resetting it. One end of the tension spring 44 is located below the second groove 42, and the other end is located at the rotatable connection between the locking mechanism 4 and the first frame 1. Under the action of the tension spring 44, the locking mechanism 4 tends to move closer to the first frame 1, thereby ensuring that the locking mechanism 4 remains in close contact with the first connecting rod 33 during the raising and lowering of the lifting mechanism 3.

[0036] Specifically, during the lifting process of the lifting mechanism 3, the locking process of the locking mechanism 4 is as follows: The user slightly pulls up the second frame 2. Driven by the gas spring 6, the lifting mechanism 3 begins to extend, thus lifting the second frame 2. At this time, the first connecting rod 33 slides along the second groove 42 and pushes up the locking mechanism 4. Under the action of the tension spring 44, the locking mechanism 4 tends to move downward. The locking mechanism 4 always maintains close contact with the first connecting rod 33. After the lifting mechanism 3 is fully extended, the first connecting rod 33 slides from the second groove 42 to the first groove 41. The first groove 41 is used to lock the first connecting rod 33 to prevent the lifting mechanism 3 from being pressed back down, thus ensuring the stability of the lifting bed after it is raised.

[0037] During the retraction of the lifting mechanism 3, the unlocking process of the locking mechanism 4 is as follows: The user pulls the second link 43 upwards, and the first link 33 disengages from the first groove 41. At this time, the user applies downward pressure on the second frame 2 and releases the second link 43. The lifting mechanism 3 is pressed and retracts to the storage state. The locking mechanism 4 automatically moves downwards under the action of the tension spring 44. The first link 33 slides into the second groove 42, and the lifting mechanism 3 is fully retracted. At this time, the second frame 2 and the first frame 1 are completely fitted together.

[0038] In summary, this application optimizes the design of the lifting and locking mechanisms, minimizing the height of the lifting mechanism after it is folded up within a limited space, thereby maximizing the thickness of the upholstery, significantly improving the comfort of the sofa bed and enhancing the user experience.

[0039] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A sofa bed comprising a sofa body and a lifting bed, the lifting bed being displaceable forward and backward relative to the sofa body to achieve switching between a sofa state and a bed state, characterized in that, The lifting bed comprises a first frame (1), a second frame (2) capable of lifting relative to the first frame (1), two groups of lifting mechanisms (3) symmetrically arranged on the left and right sides of the first frame (1) and the second frame (2), and a locking mechanism (4) for limiting the lifting mechanism (3). The lifting mechanism (3) is in X shape, and the upper and lower ends of one side thereof are rotatably connected with the second frame (2) and the first frame (1) respectively, and the upper and lower ends of the other side thereof are slidably connected with the second frame (2) and the first frame (1) respectively; a first connecting rod (33) is arranged between the two groups of lifting mechanisms (3) to realize synchronous lifting of the two groups of lifting mechanisms (3). One end of the locking mechanism (4) is rotatably connected with the front rod (11) of the first frame (1), and the other end of the locking mechanism (4) is matched with the first connecting rod (33) to limit the lifting mechanism (3).

2. The sofa bed of claim 1, wherein, The lifting mechanism (3) comprises a first lifting rod (31) and a second lifting rod (32), the middle portions of the first lifting rod (31) and the second lifting rod (32) are rotatably connected, the lower end of the first lifting rod (31) is rotatably connected with the first frame (1), the upper end of the first lifting rod (31) is slidably connected with the second frame (2), the lower end of the second lifting rod (32) is slidably connected with the first frame (1), and the upper end of the second lifting rod (32) is rotatably connected with the second frame (2).

3. The sofa bed of claim 2, wherein, The left and right sides of the first frame (1) and the second frame (2) are symmetrically provided with slide rails (5), the lower end of the first lifting rod (31) is rotatably connected with the slide rail (5) of the first frame (1) through a rotating shaft (34), the upper end of the first lifting rod (31) is slidably connected with the slide rail (5) of the second frame (2) through a roller (35), the lower end of the second lifting rod (32) is slidably connected with the slide rail (5) of the first frame (1) through a roller (35), and the upper end of the second lifting rod (32) is rotatably connected with the second frame (2) through a rotating shaft (34).

4. The sofa bed of claim 1, wherein, The locking mechanism (4) is provided with a first groove (41) and a second groove (42), and the second groove (42) is located below the first groove (41); The first groove (41) is used for clamping the first connecting rod (33) after the lifting mechanism (3) is lifted to limit the lifting mechanism (3); The second groove (42) is used for accommodating the first connecting rod (33) after the lifting mechanism (3) is folded.

5. The sofa bed of claim 4, wherein, The locking mechanism (4) has two groups, and the two groups of locking mechanisms (4) are symmetrically arranged on the two sides of the front rod (11) of the first frame (1).

6. The sofa bed of claim 5, wherein, A second connecting rod (43) is arranged between the two groups of locking mechanisms (4) to realize synchronous limiting.

7. The sofa bed of claim 4, wherein, The locking mechanism (4) is provided with a tension spring (44) for resetting the locking mechanism (4).

8. The sofa bed of claim 2, wherein, The lifting mechanism (3) is provided with an air spring (36) for providing lifting driving force.

9. The sofa bed of claim 8, wherein, One end of the air spring (36) is arranged at the first lifting rod (31) close to the first frame (1), and the other end of the air spring (36) is arranged at the second lifting rod (32) close to the second frame (2).

10. The sofa bed of claim 2, wherein, Two ends of the first connecting rod (33) are fixed at the second lifting rod (32) close to the first frame (1).

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