An angle-adjustable sofa bed backrest

Abstract

The utility model discloses an angle adjustable sofa bed backrest relates to sofa bed relevant field, to solve the backrest in prior art in the plug -in relation of plunger and through -hole realizes angle fixed, makes backrest angle regulation's numerical fixed, can only be in the numerical inside provided backrest angle regulation, cannot adjust the backrest to arbitrary angle's problem. The rear end array of backrest main part lower extreme surface is equipped with a plurality of round grooves, the intermediate pivot coaxial with the pivot between backrest main part and armrest seat is fixed in the round groove, the rotating worm wheel is fixed in the round groove along the intermediate pivot outside, the front and back end of the lower end along the position of round groove between two armrest seats all are fixed with lower limit stop plate, a plurality of rotating worms are rotatably connected between two lower limit stop plates, and the rotating worm and the rotating worm wheel position upper and lower correspondence and meshing connection.

Description

Technical Field

[0001] This utility model relates to the field of sofa beds, specifically an adjustable sofa bed backrest. Background Technology

[0002] Sofa beds, as a type of furniture that combines sitting and reclining functions, are widely used in family living rooms, bedrooms, and small living spaces. Their core design goal is to achieve a balance between space utilization and user comfort through structural optimization. Among them, the backrest is a key functional component of the sofa bed, and its angle adjustment capability directly affects the support and experience of the user in a sitting or semi-reclining posture.

[0003] In leisure settings, users may prefer a backrest tilted at 110°-130° for a near-reclining, relaxed posture. For reading or working, the backrest needs to be adjusted to 100°-110° to provide sufficient back support and maintain eye level. For sleeping, the backrest should be fully reclined to 180° to form a flat sleeping surface with the seat cushion. For example, Chinese Patent No. CN202207014U (An Adjustable Sofa Bed) includes a sofa base, a sofa backrest, a sofa pedal, and two bed boards. Its features include: the sofa backrest is positioned at the rear of the sofa base via two six-bar linkages on its left and right sides; each side of the rear of the sofa base has an angle adjustment mechanism for adjusting the six-bar linkages; the sofa pedal is positioned at the front of the sofa base via two six-bar linkages on its left and right sides; each side of the front of the sofa base has an angle adjustment mechanism for adjusting the six-bar linkages; a first bed board is installed on the sofa backrest, and a second bed board is installed between the sofa pedal and the sofa base.

[0004] Although the aforementioned prior art has the function of adjusting the backrest angle, the backrest angle is fixed due to the insertion relationship between the plunger and the through hole, which makes the value of the backrest angle adjustment fixed. The backrest angle can only be adjusted within the provided value and cannot be adjusted to any angle. Utility Model Content

[0005] The purpose of this utility model is to provide an angle-adjustable sofa bed backrest to solve the problem mentioned in the background art where the backrest is fixed in angle due to the insertion relationship between the plunger and the through hole, so that the backrest angle adjustment value is fixed and can only be adjusted within the provided value, and cannot be adjusted to any angle.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an angle-adjustable sofa bed backrest, installed based on the sofa bed body, the sofa bed body including a backrest main body and armrest seats, the backrest main body being rotatably connected to the rear end between two armrest seats, the rear end of the lower end face of the backrest main body having multiple circular slots arrayed therein, an intermediate rotating shaft coaxial with the rotating shaft between the backrest main body and the armrest seats being fixed in the circular slots, a rotating worm gear being fixed along the outside of the intermediate rotating shaft in the circular slots, lower limit plates being fixed at the front and rear ends of the two armrest seats along the lower end of the circular slots, multiple rotating worm gears being rotatably connected between the two lower limit plates, the rotating worm gears being vertically corresponding to and meshing with the rotating worm gears.

[0007] Preferably, the intermediate shaft of the rotating worm passes through the lower limiting plate at the rear end and is connected to a first rotating bevel gear, and a second rotating bevel gear is meshed with one side of the rear end of the first rotating bevel gear.

[0008] Preferably, a plurality of second rotating bevel gears are fixedly connected by an intermediate rotating rod, one end of which passes through one of the armrest seats and is connected to a hand crank.

[0009] Preferably, the sofa bed body also includes a sofa bed frame, and a support frame is fixed to the lower end of the sofa bed frame by screws.

[0010] Preferably, a lower fixed crossbar is fixed between the last end of the support frame.

[0011] Preferably, the lower end of the lower fixed crossbar is fixed with a plurality of arc-shaped outer sleeves, the other end of which extends backward. The lower end of the backrest body is fixed with a plurality of arc-shaped limiting plates, the other end of which extends forward. The arc-shaped limiting plates are limited to rotate along the inside of the arc-shaped outer sleeves, and the central axis of the arc-shaped limiting plates and the arc-shaped outer sleeves is coaxial with the central rotation axis.

[0012] Preferably, the lower end face of the backrest body has a rectangular clearance slot along the rear end of the circular slot.

[0013] Compared with the prior art, the beneficial effects of this utility model are: (1) In this utility model, when the angle of the backrest body needs to be adjusted, the rotating worm gear is driven to rotate. Since the rotating worm gear is meshed with the rotating worm wheel, the rotation of the rotating worm gear will drive the rotating worm wheel to rotate, which in turn drives the intermediate shaft fixed to the rotating worm wheel to rotate, and finally realizes the rotation of the backrest body. By utilizing the self-locking characteristic of the worm gear transmission, the backrest body can be stably maintained after being adjusted to any angle, and will not easily shake due to external force, which greatly improves the stability and safety of the backrest.

[0014] (2) In this utility model, the transmission structure consisting of a hand crank, an intermediate rotating rod, a first rotating bevel gear and a second rotating bevel gear enables the simultaneous control of the rotation of multiple rotating worm gears by a single hand crank, which simplifies the operation process and makes the backrest angle adjustment process more comfortable.

[0015] (3) In this utility model, during the rotation of the backrest body, the arc-shaped limiting plate at the lower end of the backrest body will rotate along the arc-shaped groove inside the fixed arc-shaped outer sleeve. Since the central axis of the arc-shaped limiting plate and the arc-shaped outer sleeve is coaxial with the central rotating axis, the backrest body is more stable during rotation and will not shake or deviate, which greatly improves the accuracy and stability of the backrest adjustment. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the adjustable sofa bed backrest from the main viewpoint according to the present invention. Figure 2 This is a schematic diagram of the overall structure of an adjustable sofa bed backrest with tilt angle according to the present invention. Figure 3 This is a structural diagram of the backrest body and its lower structure of an angle-adjustable sofa bed backrest according to the present invention. Figure 4 This is a schematic diagram of the overall structure of an adjustable sofa bed backrest in its original state from a frontal perspective. Figure 5 This is a schematic diagram of the overall structure of an adjustable sofa bed with the backrest in its original, upward-facing position, according to the present invention.

[0017] In the diagram: 1. Sofa bed body; 2. Sofa bed frame; 3. Support frame; 4. Lower fixed crossbar; 5. Armrest seat; 6. Backrest body; 7. Arc-shaped limiting plate; 8. Arc-shaped outer sleeve; 9. Circular slot; 10. Central pivot; 11. Rotating worm gear; 12. Lower limiting plate; 13. Rotating worm; 14. First rotating bevel gear; 15. Second rotating bevel gear; 16. Central rotating rod; 17. Hand crank; 18. Rectangular clearance slot. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0019] Please see Figures 1-5This utility model provides one embodiment: an angle-adjustable sofa bed backrest, installed on the sofa bed body 1. Through a transmission structure and limiting design, the backrest body 6 can be adjusted to any angle, improving comfort and flexibility of use.

[0020] (1) Basic structure of the sofa bed body The sofa bed body 1 includes a sofa bed frame 2, a backrest body 6, and armrest seats 5. A support frame 3 is fixed to the lower end of the sofa bed frame 2 with screws. The backrest body 6 is rotatably connected to the rear end between the two armrest seats 5. A lower fixed crossbar 4 is fixed between the rearmost support frames 3. This structural design makes the overall structure of the sofa bed stable, providing a solid foundation for the installation and adjustment of the backrest.

[0021] (2) Backrest main body installation structure The lower end face of the backrest body 6 has multiple circular slots 9 arranged in an array at the rear end. A central rotating shaft 10, coaxial with the rotating shaft between the backrest body 6 and the armrest seat 5, is fixed in the circular slots 9. A rotating worm gear 11 is fixed in the circular slots 9 along the outside of the central rotating shaft 10. Lower limit plates 12 are fixed at the front and rear ends of the two armrest seats 5 at the lower end of the circular slots 9. Multiple rotating worm gears 13 are rotatably connected between the two lower limit plates 12. The rotating worm gears 13 are vertically aligned with and mesh with the rotating worm gears 11.

[0022] When the angle of the backrest body 6 needs to be adjusted, the transmission mechanism drives the rotating worm 13 to rotate. Since the rotating worm 13 is meshed with the rotating worm wheel 11, the rotation of the rotating worm 13 will drive the rotating worm wheel 11 to rotate, which in turn drives the intermediate rotating shaft 10 fixed to the rotating worm wheel 11 to rotate, ultimately realizing the rotation of the backrest body 6.

[0023] By utilizing the self-locking characteristic of worm gear transmission, the backrest body 6 can remain stable after being adjusted to any angle, preventing it from easily wobbling due to external forces, thus greatly improving the stability and safety of the backrest. Simultaneously, the arrangement of multiple circular slots 9 and corresponding rotating worm gears 11 and worm 13 ensures that the backrest body 6 experiences uniform force during rotation, reducing localized stress concentration and extending the lifespan of the backrest.

[0024] (3) Transmission structure The intermediate shaft of the rotating worm gear 13 passes through the lower rear limit plate 12 and is connected to the first rotating bevel gear 14. The rear end of the first rotating bevel gear 14 is meshed with a second rotating bevel gear 15. Multiple second rotating bevel gears 15 are fixedly connected by an intermediate rotating rod 16. One end of the intermediate rotating rod 16 passes through one of the armrest seats 5 and is connected to a hand crank 17.

[0025] Rotating the hand crank 17 causes the intermediate rotating rod 16 to rotate, which in turn causes multiple second rotating bevel gears 15 fixed to it to rotate synchronously. Since the second rotating bevel gears 15 are meshed with the first rotating bevel gear 14, the rotation of the second rotating bevel gears 15 will cause the first rotating bevel gear 14 to rotate, which in turn will cause the rotating worm gear 13 connected to the first rotating bevel gear 14 to rotate.

[0026] The hand crank 17, the intermediate rotating rod 16, the first rotating bevel gear 14, and the second rotating bevel gear 15 form a transmission structure, which enables the simultaneous control of the rotation of multiple rotating worm gears 13 by a single hand crank 17, simplifying the operation process and improving adjustment efficiency. Moreover, the bevel gear transmission has the advantages of smooth transmission and low noise, making the backrest angle adjustment process more comfortable and without generating significant noise interference.

[0027] (4) Limiting structure Multiple arc-shaped outer sleeves 8 are fixed in an array at the lower end of the lower fixed crossbar 4, with the other end of the arc-shaped outer sleeves 8 extending backward. Multiple arc-shaped limiting plates 7 are fixed in an array at the lower end of the backrest body 6, with the other end of the arc-shaped limiting plates 7 extending forward. The arc-shaped limiting plates 7 are limited to rotate along the inside of the arc-shaped outer sleeves 8, and the central axis of the arc-shaped limiting plates 7 and the arc-shaped outer sleeves 8 is coaxial with the central rotating shaft 10.

[0028] During the rotation of the backrest body 6, the arc-shaped limiting plate 7 at the lower end of the backrest body 6 will rotate along the arc-shaped groove inside the fixed arc-shaped outer sleeve 8. Since the central axis of the arc-shaped limiting plate 7 and the arc-shaped outer sleeve 8 is coaxial with the central rotating shaft 10, the stability and accuracy of the backrest body 6 during the rotation process are ensured.

[0029] (5) Avoidance structure A rectangular clearance slot 18 is provided on the lower end face of the backrest body 6 along the rear end of the circular slot 9.

[0030] During the rotation of the backrest body 6, the rectangular clearance slot 18 provides clearance space for the relevant transmission components, avoiding interference between the transmission components and the backrest body 6, making the entire backrest adjustment structure more compact and reasonable, reducing mutual influence between components, and improving the reliability and stability of the structure.

[0031] In actual production and use, the sofa bed frame 2 is first made according to the design requirements, and the support frame 3 is fixed to the lower end of the sofa bed frame 2 with screws to ensure a firm connection. Since the sofa bed frame 2 can be stretched and extended, each stretchable bed frame has a support frame 3 at the lower end, and there are multiple support frames 3. The lower fixed crossbar 4 is fixed between the support frames 3 at the rear end.

[0032] In use, the user only needs to turn the hand crank 17. Turning the hand crank 17 drives the intermediate rotating rod 16 to rotate, which in turn drives the second rotating bevel gear 15 connected to the intermediate rotating rod 16 to rotate. Through the meshing connection between the second rotating bevel gear 15 and the first rotating bevel gear 14, the rotating worm gear 13 coaxially connected to the first rotating bevel gear 14 is driven to rotate. Through the meshing connection between the rotating worm gear 13 and the rotating worm wheel 11, the intermediate rotating shaft 10 fixed to the rotating worm wheel 11 is driven to rotate, thereby driving the backrest body 6 connected to the intermediate rotating shaft 10 to rotate.

[0033] At the same time, the arc-shaped limiting plate 7 at the lower end of the backrest body 6 rotates along the arc-shaped groove inside the fixed arc-shaped outer sleeve 8, making the backrest body 6 rotate more stably to the target angle.

[0034] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An adjustable sofa bed backrest, installed on a sofa bed body (1), the sofa bed body (1) including a backrest main body (6) and armrest seats (5), the backrest main body (6) being rotatably connected to the rear end between the two armrest seats (5), characterized in that: The rear end array of the lower end face of the backrest body (6) is provided with multiple circular slots (9). A middle rotating shaft (10) coaxial with the rotating shaft between the backrest body (6) and the armrest seat (5) is fixed in the circular slot (9). A rotating worm gear (11) is fixed in the circular slot (9) along the outside of the middle rotating shaft (10). Lower limit plates (12) are fixed at the front and rear ends of the two armrest seats (5) along the lower end of the circular slot (9). Multiple rotating worms (13) are rotatably connected between the two lower limit plates (12). The rotating worms (13) and the rotating worm gears (11) are vertically aligned and meshed.

2. The adjustable sofa bed backrest according to claim 1, characterized in that: The intermediate shaft of the rotating worm (13) passes through the lower limit plate (12) at the rear end and is connected to the first rotating bevel gear (14). The rear end of the first rotating bevel gear (14) is meshed with the second rotating bevel gear (15).

3. The adjustable sofa bed backrest according to claim 2, characterized in that: Multiple second rotating bevel gears (15) are fixedly connected by an intermediate rotating rod (16), one end of which passes through one of the armrest seats (5) and is connected to a hand crank (17).

4. The adjustable sofa bed backrest according to claim 1, characterized in that: The sofa bed body (1) also includes a sofa bed frame (2), and a support frame (3) is fixed to the lower end of the sofa bed frame (2) by screws.

5. The adjustable sofa bed backrest according to claim 4, characterized in that: The lower fixed crossbar (4) is fixed between the support frames (3) at the last end.

6. The adjustable sofa bed backrest according to claim 5, characterized in that: The lower end of the fixed crossbar (4) is fixed with multiple arc-shaped outer tubes (8), the other end of which extends backward. The lower end of the backrest body (6) is fixed with multiple arc-shaped limiting plates (7), the other end of which extends forward. The arc-shaped limiting plates (7) are limited to rotate along the inside of the arc-shaped outer tubes (8). The central axis of the arc-shaped limiting plates (7) and the arc-shaped outer tubes (8) is coaxial with the central rotating shaft (10).

7. The adjustable sofa bed backrest according to claim 1, characterized in that: The lower end face of the backrest body (6) is provided with a rectangular clearance slot (18) along the rear end of the circular slot (9).

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