Headrest-backrest linkage mechanism and sofa

Abstract

A headrest-backrest linkage mechanism, comprising: a base (10), a seat frame assembly (20), a backrest assembly (30), a headrest driving assembly (40), a headrest connecting rod assembly (50), and a headrest frame (60). The seat frame assembly (20) is disposed on the base (10) and is connected to the base (10). The backrest assembly (30) is detachably connected above a rear end of the seat frame assembly (20). An end of the headrest driving assembly (40) is connected to the seat frame assembly (20), and another end of the headrest driving assembly (40) is detachably connected to the headrest connecting rod assembly (50). The headrest connecting rod assembly (50) is separately connected to the backrest assembly (30) and the headrest frame (60). The headrest frame (60) is disposed above the backrest assembly (30). A sofa, comprising the headrest-backrest linkage mechanism.

Description

Headrest and backrest linkage mechanism and sofa Technical Field

[0001] This application relates to the field of sofa technology, and in particular to a headrest backrest linkage mechanism and a sofa. Background Technology

[0002] As a common type of home furniture, sofas have evolved over many years from simple seating into multifunctional pieces that combine comfort, functionality, and aesthetics. Modern sofas are not only increasingly diverse in materials and designs, but also incorporate various intelligent functions such as adjustable backrests and headrests to meet the growing personalized needs of consumers. Summary of the Invention

[0003] This application provides a headrest and backrest linkage mechanism and a sofa, which facilitates quick assembly and disassembly.

[0004] According to a first aspect of the embodiments of this specification, a headrest-back linkage mechanism is provided, comprising a base, a seat frame assembly, a backrest assembly, a headrest drive assembly, a headrest linkage assembly, and a headrest frame; the seat frame assembly is disposed on the base and connected to the base; the backrest assembly is detachably connected to the upper rear end of the seat frame assembly; one end of the headrest drive assembly is connected to the seat frame assembly, and the other end of the headrest drive assembly is detachably connected to the headrest linkage assembly; the headrest linkage assembly is connected to the backrest assembly and the headrest frame respectively, and the headrest frame is disposed above the backrest assembly.

[0005] Furthermore, the seat frame assembly includes a side plate, a backrest linkage piece, a backrest connector, and a backrest connecting rod; the backrest connector is connected to the upper end of the backrest connecting rod and the side plate respectively, and the backrest linkage piece is connected to the lower end of the backrest connecting rod and the side plate respectively; the side plate, the backrest linkage piece, the backrest connector, and the backrest connecting rod form a four-bar linkage mechanism.

[0006] Furthermore, the backrest assembly includes a backrest frame and a connector, the backrest connector being detachably connected to the connector, and the connector being connected to the inside of the backrest frame.

[0007] Furthermore, the headrest driving assembly includes a headrest driving component, a first headrest connecting rod, a second headrest connecting rod, and a first connecting rod insert plate connected in sequence; the headrest driving component is connected to the side plate, the first connecting rod insert plate is detachably connected to the headrest connecting rod assembly, and the middle part of the second headrest connecting rod is connected to the backrest connecting component.

[0008] Furthermore, the headrest linkage assembly includes a second linkage plate, a third headrest linkage, a fourth headrest linkage, and a headrest mounting component connected in sequence; the second linkage plate is detachably connected to the first linkage plate; and the headrest mounting component is connected to the inner side of the headrest frame.

[0009] Furthermore, the second connecting rod insert plate has a locking pin in the middle, and the first connecting rod insert plate has an arc-shaped groove adapted to the locking pin; the end of the second connecting rod insert plate is connected to the middle of the first connecting rod insert plate by a wing screw.

[0010] Furthermore, the backrest assembly includes a mounting plate connected to the inner side of the backrest assembly, the headrest mounting member connected to the upper part of the mounting plate, and the third headrest connecting rod connected to the lower part of the mounting plate.

[0011] Furthermore, the third headrest link, the fourth headrest link, the headrest mounting component, and the mounting plate form a four-bar linkage.

[0012] Furthermore, the mounting piece is provided with a limiting pin at its end near the headrest frame, and the headrest mounting component includes a first mounting part connected to the backrest assembly and a second mounting part connected to the headrest frame;

[0013] In the TV posture state, the limiting pin abuts against the second mounting part; in the lying posture state, the limiting pin abuts against the first mounting part.

[0014] Furthermore, the first mounting portion and the second mounting portion form an obtuse angle with a rounded transition.

[0015] Furthermore, the second link insert plate is provided with a bent portion on the side opposite to the backrest assembly, and the end of the bent portion near the headrest drive assembly is away from the backrest assembly.

[0016] Furthermore, during the process of switching from the TV posture state to the lying posture state, the two adjacent sides of the headrest frame and the backrest frame form an angle α, and the angle α ranges from 4° to 50°.

[0017] Furthermore, the backrest frame and the headrest frame are spaced apart, and both are rotated by the headrest drive assembly and the headrest linkage assembly, respectively. The sides of the backrest frame and the headrest frame located on the same side are on the same plane.

[0018] Furthermore, during the process of switching from the TV posture state to the reclining posture state, the included angle between the backrest connector and the backrest connecting rod increases.

[0019] According to a second aspect of the embodiments of this specification, a sofa is provided, including the headrest and backrest linkage mechanism described in the first aspect above.

[0020] This application offers the following advantages: the backrest assembly is detachably connected to the seat frame assembly, and the headrest drive assembly is detachably connected to the headrest linkage assembly. Furthermore, by removing the backrest assembly from the seat frame assembly and the headrest drive assembly from the headrest linkage assembly, quick assembly and disassembly of the backrest assembly and headrest frame can be achieved.

[0021] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this specification. Attached Figure Description

[0022] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this specification and, together with the description, serve to explain the principles of this specification.

[0023] Figure 1 is a perspective view of the sofa of this application in the TV position;

[0024] Figure 2 is a partial schematic diagram of the sofa of this application in the TV posture state;

[0025] Figure 3 is a schematic diagram of the connection between the headrest drive assembly and part of the backrest assembly of the sofa in the TV posture state of this application.

[0026] Figure 4 is a schematic diagram showing the connection between the headrest linkage assembly, part of the backrest assembly, and the headrest frame of the sofa in the TV posture of this application.

[0027] Figure 5 is a partial schematic diagram of the sofa of this application in a reclining position;

[0028] Figure 6 is a schematic diagram showing the connection between the headrest drive assembly and part of the backrest assembly of the sofa in the reclining position of this application.

[0029] Figure 7 is a schematic diagram showing the connection between the headrest linkage assembly, part of the backrest assembly, and the headrest frame of the sofa in the reclining position.

[0030] Explanation of reference numerals in the attached figures:

[0031] 10-Base; 20-Seat frame assembly; 21-Side plate; 22-Backrest linkage piece; 23-Backrest connector; 24-Backrest connecting rod; 30-Backrest assembly; 31-Backrest frame; 32-Plug-in piece; 33-Mounting piece; 34-Limiting pin; 40-Headrest drive assembly; 41-Headrest drive piece; 42-First headrest connecting rod; 43-Second headrest connecting rod; 44-First connecting rod insert plate; 45-Arc-shaped groove; 46-Wing screw; 47-Snap-fit ​​pin; 50-Headrest connecting rod assembly; 51-Second connecting rod insert plate; 511-Bending part; 52-Third headrest connecting rod; 53-Fourth headrest connecting rod; 54-Headrest mounting piece; 541-First mounting part; 542-Second mounting part; 60-Headrest frame. Detailed Implementation

[0032] The technical solutions in the embodiments (or "implementations") of this application will be clearly and completely described herein with reference to the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0033] If the embodiments of this application contain terms relating to directional indications or positional relationships (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationships and movements between components in a specific posture (as shown in the attached figures); if the specific posture changes, the directional indications or positional relationships will also change accordingly. Furthermore, the terms "first" and "second" used in the embodiments of this application are only for descriptive convenience and should not be construed as indicating or implying relative importance.

[0034] To enhance usability, sofa frames often include headrest lifting features, which raise the headrest to a certain angle when the user is reclining. These headrests typically use a motor and linkage in the backrest to achieve this function, which not only increases the weight of the backrest but also increases operating costs and makes disassembly and installation inconvenient.

[0035] Therefore, it is necessary to design a headrest and backrest linkage mechanism and a sofa to solve the above-mentioned technical problems.

[0036] The embodiments described in this specification will now be described in detail.

[0037] Referring to Figure 1, this application discloses a headrest-back linkage mechanism, which includes a base 10, a seat frame assembly 20, a backrest assembly 30, a headrest drive assembly 40, a headrest link assembly 50, and a headrest frame 60. The seat frame assembly 20 is disposed on and connected to the base 10. The backrest assembly 30 is detachably connected to the upper rear end of the seat frame assembly 20. One end of the headrest drive assembly 40 is connected to the seat frame assembly 20, and the other end of the headrest drive assembly 40 is detachably connected to the headrest link assembly 50. The headrest link assembly 50 is connected to both the backrest assembly 30 and the headrest frame 60.

[0038] This application uses a drive component (not shown in the figure) arranged on the seat frame assembly 20 to drive the seat frame assembly 20 to rotate, thereby driving the backrest assembly 30, headrest drive assembly 40, headrest linkage assembly 50 and headrest frame 60 to rotate, realizing the switching from TV (television) posture to reclining posture and from reclining posture to TV posture.

[0039] Please refer to Figure 2-7. The seat frame assembly 20 includes a side plate 21, a backrest linkage piece 22, a backrest connector 23, and a backrest connecting rod 24. The backrest connector 23 is T-shaped.

[0040] The short ends of the backrest connector 23 are connected to the upper ends of the backrest connecting rod 24 and the side plate 21, respectively, while the backrest linkage plate 22 is connected to the lower ends of the backrest connecting rod 24 and the side plate 21. The side plate 21, the backrest linkage plate 22, the backrest connector 23, and the backrest connecting rod 24 form a four-bar linkage mechanism. The linkage of the four-bar linkage mechanism can avoid unnecessary friction or jamming, ensuring the smoothness and flexibility of the operation process.

[0041] During the transition from TV posture to reclining posture, the angle between the backrest connector 23 and the backrest connecting rod 24 increases, the short side of the backrest connector 23 rotates upward, and the long side of the backrest connector 23 rotates downward, thereby enabling the backrest assembly 30 connected to the backrest connector 23 to recline.

[0042] The backrest assembly 30 includes a backrest frame 31, a connector 32, and a mounting plate 33. The backrest frame 31 has a long, strip-shaped plate structure. The connector 32 and the mounting plate 33 are both arranged on the inner side of the backrest frame 31, and the headrest frame 60 is located on top of the backrest assembly 30. Here, the inner side refers to the space relative to the sofa's outer surface.

[0043] The backrest frame 31 is located below the headrest frame 60, and the backrest frame 31 and the headrest frame 60 are spaced apart. The two are rotated by the headrest drive assembly 40 and the headrest linkage assembly 50, respectively. The sides of the backrest frame 31 and the headrest frame 60 are on the same plane, which makes the outer side of the headrest backrest linkage mechanism neat and beautiful. The plane referred to here is a vertical plane.

[0044] The connector 32 is fixed to the backrest frame 31 and located at the lower end of the backrest frame 31. In some cases, a plastic pad is also provided between the connector 32 and the backrest frame 31 to accommodate the installation position of the connector 32. The backrest connector 23 is detachably connected to the connector 32 to facilitate the assembly and disassembly of the seat frame assembly 20 and the backrest assembly 30.

[0045] The mounting plate 33 is fixed to the backrest frame 31 and located at the upper end of the backrest frame 31. In some cases, to increase the installation stability of the mounting plate 33 and the backrest frame 31, a portion of the mounting plate 33 is fixed to the backrest frame 31, while another portion is located away from the backrest frame 31 to facilitate installation with other components. A limiting pin 34 is provided at the end of the mounting plate 33 near the headrest frame 60.

[0046] The headrest drive assembly 40 includes a headrest drive member 41, a first headrest link 42, a second headrest link 43, and a first link insert plate 44, which are connected in sequence by screws. The headrest drive member 41 is connected to the side plate 21, the first link insert plate 44 is detachably connected to the headrest link assembly 50, and the middle part of the second headrest link 43 is connected to the backrest connector 23.

[0047] The headrest drive component 41 is fixed using two mounting holes on the side plate 21, which simplifies the design and assembly process and reduces manufacturing costs.

[0048] The headrest linkage assembly 50 includes a second linkage plate 51, a third headrest linkage 52, a fourth headrest linkage 53, and a headrest mounting piece 54, which are connected sequentially by screws. The second linkage plate 51 is detachably connected to the first linkage plate 44, and the headrest mounting piece 54 is connected to the inner side of the headrest frame 60. The third headrest linkage 52, the fourth headrest linkage 53, the headrest mounting piece 54, and the mounting plate 33 form a four-bar linkage mechanism.

[0049] The second linkage plate 51 has a bent portion 511 on the side opposite to the backrest assembly 30. The end of the bent portion 511 near the headrest drive assembly 40 is away from the backrest assembly 30, which allows the headrest drive assembly 40 and the seat frame assembly 20 connected to the headrest drive assembly 40 to be arranged on the inside, making the overall structure of the headrest backrest linkage mechanism more compact.

[0050] The second connecting rod insert plate 51 has a locking pin 47 in the middle, and one end of the first connecting rod insert plate 44 has an arc-shaped groove 45 that matches the locking pin 47, thereby achieving precise positioning between the second connecting rod insert plate 51 and the first connecting rod insert plate 44 and preventing the parts from shifting during assembly.

[0051] The end of the second link plate 51 is connected to the middle of the first link plate 44 by a wing screw 46. The user can manually tighten and loosen the screws to assemble and disassemble the second link plate 51 and the first link plate 44, simplifying the assembly and disassembly process and greatly improving work efficiency.

[0052] The headrest mounting component 54 includes a first mounting portion 541 connected to the backrest assembly 30, such as the mounting plate 33 or the backrest frame 31, and a second mounting portion 542 connected to the headrest frame 60. The first mounting portion 541 and the second mounting portion 542 form an obtuse angle and have a rounded transition. In the TV position, the limiting pin 34 abuts against the second mounting portion 542, and in the reclining position, the limiting pin 34 abuts against the first mounting portion 541.

[0053] The design of the limiting pin 34 restricts the opening angle and closing position between the headrest frame 60 and the backrest frame 31. During the transition from the TV posture to the reclining posture, the two adjacent sides of the headrest frame 60 and the backrest frame 31 form an angle α, which ranges from 4° to 50°. The angle α is smaller in the TV posture than in the reclining posture.

[0054] This application detachably connects the backrest assembly 30 to the seat frame assembly 20 and the headrest drive assembly 40 to the headrest link assembly 50. Furthermore, by removing the backrest assembly 30 from the seat frame assembly 20 and the headrest drive assembly 40 from the headrest link assembly 50, the backrest assembly 30 and the headrest frame 60 can be quickly disassembled and assembled, facilitating transportation.

[0055] In this application, the headrest drive component 41 is stretched forward by the side plate 21. The stretching of the side plate 21 causes the second headrest link 43 to rotate at a certain angle, which in turn drives the first link insert plate 44 and the headrest link assembly 50 to rotate, so that the backrest assembly 30 and the headrest frame 60 open at a certain angle, thereby realizing the linkage function.

[0056] This application discloses a sofa including the aforementioned headrest and backrest linkage mechanism. The sofa of this application has a simple structure, low production cost, high production efficiency, and can be quickly assembled and disassembled. After the connector 32 is installed by interlocking with the backrest frame 31, the headrest drive assembly 40 and the headrest connecting rod assembly 50 can be easily disassembled and assembled by manually tightening and loosening the wing screw 46.

[0057] It should be noted that the technical solutions or features described in the above embodiments can be combined or supplemented with each other without conflict. The scope of protection of this application is not limited to the precise structures described in the above embodiments and shown in the accompanying drawings; all modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A headrest backrest linkage mechanism, comprising a base (10), a seat frame assembly (20), a backrest assembly (30), a headrest drive assembly (40), a headrest linkage assembly (50), and a headrest frame (60); The seat frame assembly (20) is disposed on the base (10) and connected to the base; The backrest assembly (30) is detachably connected to the upper rear end of the seat frame assembly; One end of the headrest drive assembly (40) is connected to the seat frame assembly (20), and the other end of the headrest drive assembly (40) is detachably connected to the headrest link assembly (50). The headrest link assembly (50) is connected to the backrest assembly (30) and the headrest frame (60) respectively, and the headrest frame (60) is disposed above the backrest assembly (30).

2. The headrest and backrest linkage mechanism according to claim 1, wherein, The seat frame assembly includes a side plate (21), a backrest linkage piece (22), a backrest connector (23), and a backrest connecting rod (24); the backrest connector (23) connects the backrest connecting rod (24) and the upper end of the side plate respectively, and the backrest linkage piece (22) connects the backrest connecting rod (24) and the lower end of the side plate respectively; the side plate, the backrest linkage piece, the backrest connector, and the backrest connecting rod form a four-bar linkage mechanism.

3. The headrest and backrest linkage mechanism according to claim 2, wherein, The backrest assembly includes a backrest frame (31) and a connector (32), wherein the backrest connector (23) is detachably connected to the connector and the connector is connected to the inside of the backrest frame.

4. The headrest backrest linkage mechanism according to claim 2 or 3, wherein, The headrest drive assembly includes a headrest drive member (41), a first headrest link (42), a second headrest link (43), and a first link plate (44) connected in sequence; the headrest drive member is connected to the side plate, the first link plate is detachably connected to the headrest link assembly, and the middle part of the second headrest link is connected to the backrest connector (23).

5. The headrest-backrest linkage mechanism according to claim 4, wherein, The headrest linkage assembly includes a second linkage plate (51), a third headrest linkage (52), a fourth headrest linkage (53), and a headrest mounting component (54) connected in sequence; the second linkage plate is detachably connected to the first linkage plate; the headrest mounting component is connected to the inner side of the headrest frame.

6. The headrest-backrest linkage mechanism according to claim 5, wherein, The second connecting rod insert plate has a snap-fit ​​pin (47) in the middle, and the first connecting rod insert plate has an arc-shaped groove (45) that matches the snap-fit ​​pin; the end of the second connecting rod insert plate is connected to the middle of the first connecting rod insert plate by a wing screw (46).

7. The headrest-back linkage mechanism according to claim 5 or 6, wherein, The backrest assembly includes a mounting plate (33) connected to the inner side of the backrest assembly, a headrest mounting member connected to the upper part of the mounting plate, and a third headrest connecting rod connected to the lower part of the mounting plate.

8. The headrest and backrest linkage mechanism according to claim 7, wherein, The third headrest link, the fourth headrest link, the headrest mounting component, and the mounting plate form a four-bar linkage.

9. The headrest-back linkage mechanism according to claim 7 or 8, wherein, The mounting piece is provided with a limiting pin (34) at the end near the headrest frame. The headrest mounting component includes a first mounting part (541) connected to the backrest assembly and a second mounting part (542) connected to the headrest frame. In the TV position, the limiting pin abuts against the second mounting part; in the lying position, the limiting pin abuts against the first mounting part.

10. The headrest-backrest linkage mechanism according to claim 9, wherein, The first mounting portion and the second mounting portion form an obtuse angle and have a rounded transition.

11. The headrest backrest linkage mechanism according to any one of claims 5 to 10, wherein, The second link insert plate is provided with a bent portion (511) on the side away from the backrest assembly, and the end of the bent portion near the headrest drive assembly (40) is away from the backrest assembly (30).

12. The headrest backrest linkage mechanism according to any one of claims 3 to 11, wherein, During the process of switching from the TV posture state to the lying posture state, the two adjacent sides of the headrest frame and the backrest frame form an included angle α, and the included angle α ranges from 4° to 50°.

13. The headrest backrest linkage mechanism according to any one of claims 3 to 12, wherein, The backrest frame and the headrest frame are spaced apart, and both are rotated by the headrest drive assembly and the headrest linkage assembly, respectively. The sides of the backrest frame and the headrest frame located on the same side are on the same plane.

14. The headrest backrest linkage mechanism according to any one of claims 2 to 13, wherein, During the process of switching from the TV posture state to the reclining posture state, the included angle between the backrest connector and the backrest connecting rod increases.

15. A sofa comprising the headrest and backrest linkage mechanism as described in any one of claims 1 to 14.

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