An adjustable backrest mechanism, bed, and sofa.

Abstract

This utility model relates to the field of backrests and discloses an adjustable backrest mechanism suitable for fixing to a supporting body. The backrest mechanism includes: a backrest; at least one set of linkage components, each set of linkage components including a first link, a second link, a third link, and a fourth link hinged end to end; wherein, the first link is fixed to the supporting body; the third link is fixed to the backrest; a set of moving and stationary rods, including a fixed rod and a movable rod; the fixed rod is fixed to one side of the first link; the movable rod is fixed to one side of the fourth link; a drive assembly, the drive assembly including a base and a slide; the base is hinged to the fixed rod; the slide is hinged to the movable rod; the drive assembly drives the slide to reciprocate relative to the base, so that the backrest rotates relative to the supporting body. This utility model, by symmetrically arranging two sets of linkage components and drive components, can adjust the backrest angle, allowing the user to maintain a comfortable leaning posture.

Description

Technical Field

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

[0002] Beds and sofas are common pieces of furniture. Nowadays, when people rest or read in bed or on a sofa, they usually lean directly against the headboard or sofa back for comfort. However, these backrests are generally fixed in angle and cannot be adjusted, resulting in inadequate support for the lower back, shoulders, and neck, leading to poor comfort. For added comfort, people often use pillows as backrests. However, because pillows are small, they are prone to tilting or slipping during use, failing to guarantee a correct and comfortable posture.

[0003] Existing technologies also include backrest adjustment mechanisms to adjust the backrest angle, ensuring a comfortable posture. These mechanisms are installed on supporting structures like sofas or beds. However, these angle adjustment mechanisms are generally manual, which is inconvenient, and the backrest angle is not very stable, preventing users from maintaining a comfortable posture for extended periods. In today's rapidly evolving technological landscape, people have higher demands for these backrest adjustment mechanisms, requiring more convenient adjustment methods, such as electrically adjustable backrest angles, to allow users to maintain a comfortable leaning posture. Utility Model Content

[0004] To address at least one of the aforementioned problems, this utility model first provides an adjustable backrest mechanism suitable for fixing to a supporting body. The backrest mechanism includes: a backrest; at least one set of linkage components, each set including a first link, a second link, a third link, and a fourth link hinged end-to-end; wherein the first link is fixed to the supporting body; the third link is fixed to the backrest; a set of moving and stationary rods, including a fixed rod and a movable rod; the fixed rod is fixed to one side of the first link; the movable rod is fixed to one side of the fourth link; a drive assembly, one end of which is hinged to the fixed rod; the drive assembly includes a base and a slide; the base is hinged to the fixed rod; the slide is hinged to the movable rod; the drive assembly drives the slide to reciprocate relative to the base, thereby causing the backrest to rotate relative to the supporting body.

[0005] Optionally, the first link protrudes outward in at least a portion of its rotational trajectory adjacent to the fourth link to form a protrusion; a non-contact gap is formed between the protrusion and the fourth link; the protrusion has a plurality of through holes.

[0006] Optionally, the second link is hinged to the middle or near the middle of the first link; the fourth link is hinged to the end of the first link.

[0007] Optionally, the third link is provided with a support surface so that the third link supports the backrest.

[0008] Optionally, the support surface has multiple mounting holes; fasteners are inserted into the mounting holes to fix the backrest to the third link.

[0009] Optionally, the backrest mechanism further includes at least two corner plates; one corner plate is fixed between the fixed rod and the first connecting rod, and the other corner plate is fixed between the movable rod and the fourth connecting rod; the corner plates have a first mounting surface and a second mounting surface that are perpendicular to each other; a mounting connector passes through the first mounting surface; and a bolt group passes through the second mounting surface.

[0010] Optionally, the linkage assembly has two sets, and the two sets of linkage assemblies are symmetrically arranged; the fixed rod is fixed between the two first connecting rods; and the movable rod is fixed between the two fourth connecting rods.

[0011] Optionally, the drive assembly is a linear module, which further includes a motor, a lead screw, and a guide rail; the motor output end, the lead screw, and the slide are connected in sequence; the slide is slidably engaged with the guide rail.

[0012] Compared to existing technologies, the backrest mechanism in this invention uses two sets of symmetrically linked components. When the drive components work, they cause the backrest to rotate, which can adjust the backrest angle, allowing the user to maintain a comfortable leaning posture and providing stable support.

[0013] This utility model also provides a bed, which includes the aforementioned backrest mechanism. The bed also has the same beneficial effects as the aforementioned backrest mechanism, which will not be described in detail here.

[0014] This utility model also provides a sofa, which includes the backrest mechanism described above. The sofa also has the same beneficial effects as the backrest mechanism described above, which will not be repeated here. Attached Figure Description

[0015] Figure 1 This is a structural diagram of Embodiment 1 of the present utility model;

[0016] Figure 2 for Figure 1 The left view;

[0017] Figure 3 for Figure 1 Top view;

[0018] Figure 4 This is a structural diagram of the linkage component;

[0019] Figure 5 This is a schematic diagram of the movement of the linkage components.

[0020] Explanation of reference numerals in the attached figures:

[0021] 1-Linkage assembly; 2-Moving and stationary rod assembly; 3-Drive assembly; 4-Slide block; 5-Angle plate; 101-First connecting rod; 102-Second connecting rod; 103-Third connecting rod; 104-Fourth connecting rod; 105-Protrusion; 106-Through hole; 107-Supporting surface; 108-Mounting hole; 201-Fixed rod; 202-Moving rod; 301-Motor; 302-Guide rail; 501-First bolt assembly; 502-Second bolt assembly. Detailed Implementation

[0022] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0023] In the description of this utility model, it should be understood that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship when the product is in normal use.

[0024] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature.

[0025] Example 1

[0026] This utility model provides an adjustable backrest mechanism suitable for fixing to a support body (not shown in the figure), such as a sofa or bed. The backrest mechanism is mounted on these support bodies to adjust the angle of the backrest. (See reference...) Figure 5 As shown in the diagram, arrow F indicates the direction in which the user applies pressure to the backrest mechanism; combined with... Figure 1 As shown, the backrest mechanism includes: a backrest (not shown); two sets of linkage components 1, each set of linkage components 1 including a first link 101, a second link 102, a third link 103, and a fourth link 104 hinged end to end; wherein, the first link 101 is fixed to the supporting body; the third link 103 is fixed to the backrest; a dynamic and static rod group 2, which includes a fixed rod 201 and a movable rod 202; the fixed rod 201 is fixed to one side of the first link 101; the movable rod 202 is fixed to one side of the fourth link 104; a drive assembly 3, which includes a base and a slide 4; the base is hinged to the fixed rod 201; the slide 4 is hinged to the movable rod 202; the drive assembly 3 drives the slide 4 to reciprocate relative to the base, so that the backrest rotates relative to the supporting body. The third link 103 is provided with a support surface 107 so that the third link 103 supports the backrest.

[0027] Regarding the third link 103: The third link 103 is bent along its centerline or approximately at its centerline to form a plate for supporting the backrest, which is the support surface 107. The support surface 107 has multiple mounting holes 108; fasteners are inserted into the mounting holes 108 to fix the backrest to the third link 103; the fasteners can be bolts and nuts, or other installation methods.

[0028] Regarding the configuration of the two sets of linkage components 1: the two sets of linkage components 1 are symmetrically arranged; the fixed rod 201 is fixed between the two first connecting rods 101; the movable rod 202 is fixed between the two fourth connecting rods 104. Setting up two sets of linkage components 1 makes the system more stable. When the drive component 3 is driven, it causes the movable rod 202 to rotate relative to the fixed rod 201, resulting in a more stable backrest tilt angle and better support.

[0029] Regarding the hinge positions of the second link 102 and the first link 101, and the fourth link 104 and the first link 101: the second link 102 is hinged to the middle or near the middle of the first link 101; the fourth link 104 is hinged to the end of the first link 101, which can provide a stable support.

[0030] like Figure 1 and 5 As shown, the drive component 3 is a linear module, which adopts the lead screw type linear module of the prior art. This linear module also includes a motor 301, a lead screw, and a guide rail 302; the output end of the motor 301, the lead screw, and the slide 4 are connected in sequence; the slide 4 slides in conjunction with the guide rail 302. The specific working principle is as follows: After the circuit is turned on, the motor 301 operates, and its output shaft rotates, thereby driving the lead screw to rotate. The rotation of the lead screw, in turn, drives the slide 4 to reciprocate linearly on the guide rail 302. In actual operation, a remote control can also be set to control whether the motor 301 works, thereby controlling the adjustment of the backrest angle.

[0031] like Figure 1 As shown, the backrest mechanism also includes at least two corner plates 5; one corner plate 5 is fixed between the fixed rod 201 and the first connecting rod 101, and the other corner plate 5 is fixed between the movable rod 202 and the fourth connecting rod 104; the corner plate 5 has a first mounting surface and a second mounting surface that are perpendicular to each other; the first mounting surface is provided with a mounting connector 501; the second mounting surface is provided with a bolt group 502, which is installed and fixed by means of bolt and nut engagement, and the structure is simple and practical.

[0032] Example 2

[0033] Based on Example 1, such as Figure 1As shown, the first link 101 protrudes outward in at least a portion of its rotational trajectory adjacent to the fourth link 104, forming a protrusion 105. A non-contact gap is formed between the protrusion 105 and the fourth link 104, thus reducing the contact area between the first link 101 and the fourth link 104 during movement. This reduces friction between the first link 101 and the fourth link 104 when adjusting the backrest angle, thereby reducing wear and tear, increasing the service life of the linkage assembly 1, and facilitating installation with the support body. Of course, similar protrusions 105 can also be provided in the areas where the first link 101, second link 102, third link 103, and fourth link 104 contact each other to reduce friction. The protrusion 105 has multiple through holes 106, allowing for installation and fixation with other positions on the support body.

[0034] Example 3

[0035] Based on Embodiment 1 or 2, this utility model also provides a bed, which includes the aforementioned backrest mechanism, with the bed itself serving as the supporting body. Specifically, the installation operation is as follows: two first connecting rods 101 and a fixing rod 201 are fixed at a certain angle to the fixed headboard of the bed, and then the backrest is fixed to the supporting surface 107 by means of bolt assemblies or other fastening methods. In this way, under the drive of the drive assembly 3, the backrest is rotated relative to the fixing rod 201, thereby achieving the effect of adjusting the tilt angle of the backrest.

[0036] Regarding the backrest: The backrest can be designed as a single unit or a separate unit. A separate backrest includes an upper backrest and a lower backrest. If the backrest mechanism is connected to the entire backrest, whether it is a single unit or a separate unit, the backrest mechanism will adjust the angle of the entire backrest. If the backrest mechanism is connected to the lower backrest, the backrest mechanism will adjust the tilt angle of the lower backrest to meet the user's different posture needs. Furthermore, during installation, the two first connecting rods 101 and the fixing rod 201 form a fixed frame. This fixed frame is directly attached to the headboard surface or installed at a certain angle to the headboard. When the fixed frame is installed at a certain angle to the headboard surface, a basic tilt angle can be pre-established. Adjusting the backrest angle at this tilt angle ensures a suitable range of backrest angle adjustment.

[0037] Example 4

[0038] Based on Embodiment 1 or 2, this utility model also provides a sofa, which includes the aforementioned backrest mechanism, with the sofa as the supporting body. Similarly, the sofa and backrest mechanism can be installed using the same method as the backrest mechanism of the bed in Embodiment 2. Specifically, the two first connecting rods 101 and the fixing rod 201 are fixed at a certain angle to the fixed support back of the sofa, and the backrest is then fixed to the support surface 107 using bolt assemblies or other fastening methods. In this way, the backrest is rotated relative to the fixing rod 201 under the drive of the drive assembly 3, thereby achieving the effect of adjusting the tilt angle of the backrest, allowing the user to maintain a comfortable sitting posture on the sofa.

[0039] Although the disclosure is as stated above, the scope of protection of this disclosure is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of this disclosure, and all such changes and modifications will fall within the protection scope of this utility model.

Claims

1. An angle-adjustable backrest mechanism adapted to be fixed to a supporting body, characterized in that, The backrest mechanism includes: Backrest; At least one set of linkage components (1), each set of linkage components (1) includes a first link (101), a second link (102), a third link (103) and a fourth link (104) that are hinged from end to end; wherein, the first link (101) is fixed to the support body; the third link (103) is fixed to the backrest; The moving and stationary rod assembly (2) includes a fixed rod (201) and a movable rod (202); the fixed rod (201) is fixed to one side of the first connecting rod (101); the movable rod (202) is fixed to one side of the fourth connecting rod (104); The drive assembly (3) includes a base and a slide (4); the base is hinged to the fixed rod (201); the slide (4) is hinged to the movable rod (202); the drive assembly (3) drives the slide (4) to reciprocate relative to the base so that the backrest rotates relative to the support body.

2. An angle adjustable backrest mechanism according to claim 1, characterized in that The first link (101) protrudes outward in at least a portion of its rotational trajectory adjacent to the fourth link (104) to form a protrusion (105); a non-contact gap is formed between the protrusion (105) and the fourth link (104); The protrusion (105) has multiple through holes (106).

3. The angularly adjustable backrest mechanism of claim 1, wherein, The second link (102) is hinged to the middle or near the middle of the first link (101); the fourth link (104) is hinged to the end of the first link (101).

4. The angularly adjustable backrest mechanism of claim 1, wherein, The third link (103) is provided with a support surface (107) so that the third link (103) supports the backrest.

5. An angle adjustable backrest mechanism according to claim 4, characterized in that The support surface (107) has a plurality of mounting holes (108); fasteners are inserted into the mounting holes (108) to fix the backrest to the third link (103).

6. An angle adjustable backrest mechanism according to claim 1, characterized in that The backrest mechanism also includes at least two corner plates (5); one of the corner plates (5) is fixed between the fixed rod (201) and the first connecting rod (101), and the other corner plate (5) is fixed between the movable rod (202) and the fourth connecting rod (104); The corner plate (5) has a first mounting surface and a second mounting surface that are perpendicular to each other; the first mounting surface is provided with a mounting connector (501); the second mounting surface is provided with a bolt group (502).

7. The angularly adjustable backrest mechanism of claim 1, wherein, The linkage component (1) has two sets, and the two sets of linkage components (1) are symmetrically arranged; the fixed rod (201) is fixed between the two first connecting rods (101); the movable rod (202) is fixed between the two fourth connecting rods (104).

8. The angularly adjustable backrest mechanism of claim 1, wherein, The drive assembly (3) is a linear module, which also includes a motor (301), a lead screw and a guide rail (302); the output end of the motor (301), the lead screw and the slide (4) are connected in sequence; the slide (4) is slidably engaged with the guide rail (302).

9. A bed characterized in that, The bed includes an adjustable backrest mechanism as described in any one of claims 1-8.

10. A sofa, characterized in that The sofa includes an adjustable backrest mechanism as described in any one of claims 1-8.

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