Sofa allowing for linked adjustment of headrest and backrest

Abstract

The present application relates to a sofa allowing for linked adjustment of a headrest and a backrest, comprising a base and a backrest assembly. The base is movably connected to side plates and backrest linkage pieces hingedly connected to the side plates; the backrest assembly comprises backrest connecting members and backrest connecting rods; the front end of each backrest connecting member is hingedly connected to the position close to the upper side at the rear end of the corresponding side plate, the upper end of each backrest connecting rod is hingedly connected to the rear end of the corresponding backrest connecting member, and the lower end of each backrest connecting rod is hingedly connected to the corresponding backrest linkage piece; the base is provided with a driving member used for driving the side plates to swing so that a backrest frame switches into a lying posture; the backrest assembly further comprises the backrest frame detachably connected to the backrest connecting members; the backrest frame is hingedly connected to headrest connecting members located above the backrest connecting members; and headrest linkage assemblies forcing the headrest connecting members to turn relative to the backrest frame are provided between the backrest connecting rods and the headrest connecting members. The present application has the effect of reducing the production costs of a functional sofa.

Description

Sofa with headrest and backrest linkage adjustment function Technical Field

[0001] The present application relates to the technical field of functional furniture, and in particular to a sofa with a headrest and backrest linkage adjustment function. Background Art

[0002] Current functional sofas usually have the function of converting into three postures: sitting, TV, and lying, to meet most of the users' daily needs for seating.

[0003] For example, the Chinese patent with the authorization announcement number CN217658890U discloses a functional sofa extension device, including a base, a linkage assembly, a leg assembly and a backrest assembly, the linkage assembly includes a first support rod rotatably connected to the base at the lower end, a second support rod rotatably connected to the base at the lower end, a first linkage rod rotatably connected to the upper end of the first support rod at one end, and a first linkage piece rotatably connected between the upper end of the second support rod and the other end of the first linkage rod; the linkage assembly also includes side panels, the leg assembly and the backrest assembly are respectively installed at both ends of the side panels, a driving rod is passed through the side panels and the driving rod is connected to the leg assembly; the first linkage rod is rotatably connected to a limiting member between one end of the side panel close to the leg assembly, and a linkage is provided at the side panel close to the backrest assembly point, the first linkage piece is rotatably connected to the linkage point, and when the extension device is in a sitting position or a TV position, the rotation point of the first linkage rod and the first linkage piece is located in height between the linkage point and the upper end of the second support rod; a functional part is rotatably connected to the side panel, and the upper and lower ends of the functional part are rotatably connected to the first functional rod and the second functional rod respectively, one end of the first functional rod is rotatably connected to the first support rod, and one end of the second functional rod is rotatably connected to the leg assembly; the linkage assembly also includes a pulling member, one end of the pulling member is connected to the first linkage rod or the first linkage piece, and the other end of the pulling member is connected to the first support rod or the base, and the pulling member applies a pulling force to the first linkage piece to rotate around the linkage point toward the leg assembly; the sofa backrest is installed on the backrest connector of the backrest assembly.

[0004] In order to improve the comfort of using functional sofas, headrests are usually added to the sofa backrests for the user's head to rest on. The angle adjustment of the headrests is achieved by individual control and adjustment of the motor, which increases the production cost of the functional sofas, and therefore needs further improvement. Utility Model Content

[0005] In order to reduce the production cost of functional sofas, the present application provides a sofa with a headrest and backrest linkage adjustment function.

[0006] The present application provides a sofa with a headrest and backrest linkage adjustment function, which adopts the following technical solutions:

[0007] The cam is hinged on the side panels and the lower end of the backrest is hinged on the backrest linking piece, and the backrest linking piece is hinged on the side panels to form a four-rod structure. The cam is hinged on the side panels and the lower end of the backrest is hinged on the backrest linking piece, and the backrest linking piece, the backrest linking piece and the side panels form a four-rod structure. The cam is hinged on the side panels and the lower end of the backrest is hinged on the backrest linking piece, and the backrest linking piece and the side panels form a four-rod structure. The cam is hinged on the side panels and the lower end of the backrest is hinged on the backrest linking piece.

[0008] By adopting the above technical solution, when the driving member drives the side panel to swing so that the backrest frame switches to a lying position, the headrest linkage assembly arranged between the backrest connecting rod and the headrest connecting member forces the headrest connecting member to flip and adjust relative to the backrest frame, thereby realizing linkage without adding additional driving elements, effectively reducing the production cost of functional sofas.

[0009] Preferably, the headrest connecting member includes a first headrest rod hinged at a lower portion to the backrest frame and a second headrest rod fixedly connected to the lower end of the first headrest rod, and the headrest linkage assembly includes a first headrest linkage plate, a second headrest linkage plate, a first headrest linkage rod, a linkage reversing rod and a second headrest linkage rod, the lower portion of the first headrest linkage plate is hinged to the backrest connecting rod, the lower front side of the second headrest linkage plate is hinged to the backrest connecting member, the lower rear side of the second headrest linkage plate is hinged to the upper portion of the first headrest linkage plate, the lower portion of the first headrest linkage rod is hinged to the upper portion of the second headrest linkage plate, the middle portion of the linkage reversing rod is hinged to the backrest frame, the front side of the linkage reversing rod is hinged to the upper portion of the first headrest linkage rod, the rear side of the linkage reversing rod is hinged to the lower portion of the second headrest linkage rod, and the upper portion of the second headrest linkage rod is hinged to the lower portion of the second headrest rod.

[0010] By adopting the above technical solution, during the process of the backrest frame switching from the TV posture to the lying posture, the front side of the backrest connecting member is tilted upward and the rear side of the backrest connecting member is flipped downward, thereby increasing the angle between the backrest connecting member and the backrest connecting rod. During this process, the upper part of the second headrest linkage piece swings backward relative to the backrest connecting member, thereby pulling the front side of the linkage reversing rod to swing downward relative to the backrest frame through the first headrest linkage rod, and the rear side of the linkage reversing rod to swing upward relative to the backrest frame, and then pushing the lower end of the second headrest rod to flip upward relative to the backrest frame through the second headrest linkage rod, thereby realizing the upper part of the first headrest rod to swing forward relative to the backrest frame, thereby forming a protrusion on the support surface of the backrest frame for the user's head to rest on.

[0011] Preferably, the backrest frame is detachably connected to a mounting plate, the first headrest rod is hinged to the upper portion of the mounting plate, and the linkage reversing rod is hinged to the lower portion of the mounting plate.

[0012] By adopting the above technical solution, after the headrest linkage assembly, the headrest connector and the mounting plate are assembled, the backrest frame is then installed on the backrest connector and the mounting plate respectively to realize the assembly of the backrest frame and the backrest connector / headrest connector.

[0013] Preferably, the backrest frame is fixed to the backrest connector by bolts, and the hinged portion of the second headrest linkage piece and the first headrest linkage rod is connected by bolt and nut matching.

[0014] By adopting the above technical solution, the first headrest linkage rod, the linkage reversing rod, the second headrest linkage rod and the headrest connecting piece are independently installed on the backrest frame, and the second headrest linkage piece and the hinged part of the first headrest linkage rod are connected by bolts and nuts to realize the detachable connection between the second headrest linkage piece and the first headrest linkage rod. When the sofa is transported, the connection between the second headrest linkage piece and the first headrest linkage rod is disassembled, and the connection between the backrest frame and the backrest connecting piece is disassembled, so that the backrest frame is packaged separately to improve transportation convenience.

[0015] Preferably, the second headrest linkage piece is provided with a limiting groove in an arc shape, the axis of the limiting groove coincides with the axis of the hinge point of the second headrest linkage piece and the first headrest linkage piece, and the first headrest linkage piece is protruding with a limiting rod slidably connected to the limiting groove.

[0016] By adopting the above technical solution, a limit rod is provided. When the limit rod abuts against the inner side walls at both ends of the limit groove, the backrest frame cannot continue to flip forward or backward, thereby limiting the flipping angle of the backrest frame and improving the structural stability of the backrest frame.

[0017] Preferably, the limiting rod fixing sleeve is provided with a wear-resistant sleeve.

[0018] By adopting the above technical solution, a wear-resistant sleeve is added to reduce the possibility of rigid contact between the limit rod and the second headrest linkage piece, thereby improving the service life of the limit rod and the second headrest linkage piece, and effectively reducing the possibility of noise generated when the limit rod collides with the inner wall of the limit groove.

[0019] Preferably, the limiting rod is a limiting bolt, the limiting bolt is passed through the wear-resistant sleeve, the limiting bolt is threadedly connected to the first headrest linkage piece, and the nut of the limiting bolt abuts against the end face of the wear-resistant sleeve.

[0020] By adopting the above technical solution, the limiting rod is a limiting bolt, which facilitates the replacement of the damaged wear-resistant sleeve.

[0021] Preferably, the backrest frame is a wooden frame.

[0022] By adopting the above technical solution, the backrest frame is a wooden frame, which effectively reduces the overall manufacturing cost of the sofa compared to an iron frame.

[0023] In summary, the present invention has the following beneficial effects:

[0024] 1. When the driving member drives the side panels to swing so that the backrest frame switches to a reclining position, the headrest linkage assembly arranged between the backrest connecting rod and the headrest connecting member forces the headrest connecting member to flip and adjust relative to the backrest frame, achieving linkage without adding additional driving components, effectively reducing the production cost of functional sofas;

[0025] 2. The first headrest linkage rod, the linkage reversing rod, the second headrest linkage rod and the headrest connecting piece are independently installed on the backrest frame. The second headrest linkage piece and the hinged part of the first headrest linkage rod are connected by bolts and nuts to achieve a detachable connection between the second headrest linkage piece and the first headrest linkage rod. When transporting the sofa, the connection between the second headrest linkage piece and the first headrest linkage rod is disassembled, and the connection between the backrest frame and the backrest connecting piece is disassembled, so that the backrest frame can be packaged separately to improve transportation convenience. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] FIG1 is a schematic diagram of the overall structure of a sofa with a headrest and backrest linkage adjustment function;

[0027] Figure 2 is a structural diagram of a sofa in a TV posture;

[0028] Figure 3 is a schematic structural diagram of the headrest linkage assembly;

[0029] FIG4 is a schematic diagram of the connection structure of the first headrest linkage piece and the second headrest linkage piece;

[0030] FIG5 is a structural diagram of a sofa in a lying position.

[0031] In the figure, 1. base; 11. side panel; 12. backrest linkage plate; 2. backrest assembly; 21. backrest connector; 22. backrest connecting rod; 23. backrest frame; 24. mounting plate; 3. headrest connector; 31. first headrest rod; 32. second headrest rod; 33. headrest mounting plate; 4. headrest linkage assembly; 41. first headrest linkage plate; 411. limiting rod; 412. wear-resistant sleeve; 42. second headrest linkage plate; 421. limiting slot; 43. first headrest linkage rod; 44. linkage reversing rod; 45. second headrest linkage rod. DETAILED DESCRIPTION

[0032] The present application is further described in detail below with reference to Figures 1-5.

[0033] An embodiment of the present application discloses a sofa with a headrest and backrest linkage adjustment function, referring to Figures 1 and 2, comprising a base 1 and a backrest assembly 2, the base 1 being movably connected to side panels 11 and a backrest linkage piece 12 hinged to the side panels 11, the backrest assembly 2 comprising a backrest connector 21 and a backrest connecting rod 22, the front end of the backrest connector 21 being hinged to the upper position of the rear end of the side panel 11, the upper end of the backrest connecting rod 22 being hinged to the rear end of the backrest connector 21, and the lower end of the backrest connecting rod 22 being hinged to the backrest linkage piece 12, the backrest connector 21, the backrest connecting rod 22, the backrest linkage piece 12 and the side panel 11 forming a four-bar structure, the base 1 being provided with a driving member for driving the side panel 11 to swing so that the backrest frame 23 is switched from a TV posture to a lying posture. In this embodiment, the base 1 adopts the overall structure of a functional sofa extension device disclosed in the Chinese patent with authorization announcement number CN217658890U. The base 1, side panel 11, backrest linkage plate 12, backrest assembly 2 and driving component are all existing technologies and will not be described in detail here.

[0034] The upper portion of the backrest connector 21 is detachably connected to the backrest frame 23 via bolts. In this embodiment, the backrest frame 23 is a wooden frame, and the upper portion of the backrest connector 21 extends into the inner cavity of the backrest frame 23. A mounting plate 24 is detachably connected to the inner sidewall of the backrest frame 23 via bolts. The upper portion of the mounting plate 24 is provided with a headrest connector 3 positioned above the backrest connector 21. The headrest connector 3 includes a first headrest rod 31 hinged at its lower portion to the mounting plate 24, a second headrest rod 32 fixedly connected to the lower end of the first headrest rod 31, and a headrest mounting plate 33 fixedly connected to the front side of the free end of the first headrest rod 31. The surface of the headrest mounting plate 33 is parallel to the front surface of the backrest frame 23 and is used to mount a headrest support plate (not shown).

[0035] 2 and 3 , a headrest linkage assembly 4 is provided between the backrest connecting rod 22 and the second headrest rod 32 for driving the headrest connecting member 3 to flip relative to the backrest frame. The headrest linkage assembly 4 includes a first headrest linkage piece 41, a second headrest linkage piece 42, a first headrest linkage rod 43, a linkage reversing rod 44, and a second headrest linkage rod 45. The lower portion of the first headrest linkage piece 41 is hinged to the middle portion of the backrest connecting rod 22, the lower front portion of the second headrest linkage piece 42 is hinged to the backrest connecting member 21, and the lower rear portion of the second headrest linkage piece 42 is hinged to the upper portion of the first headrest linkage piece 41. The lower portion of the first headrest linkage rod 43 is hinged to the upper portion of the second headrest linkage plate 42. The linkage reversing rod 44 is located between the second headrest linkage plate 42 and the second headrest rod 32. The middle portion of the linkage reversing rod 44 is hinged to the lower portion of the mounting plate 24. The front side of the linkage reversing rod 44 is hinged to the upper portion of the first headrest linkage rod 43, and the rear side of the linkage reversing rod 44 is hinged to the lower portion of the second headrest linkage rod 45. The upper portion of the second headrest linkage rod 45 is hinged to the lower portion of the second headrest rod 32. The hinged portion of the second headrest linkage plate 42 and the first headrest linkage rod 43 are connected by bolts and nuts, facilitating disassembly of the second headrest linkage plate 42 and the first headrest linkage rod 43.

[0036] Referring to Figures 3 and 4 , a circular arc-shaped retaining groove 421 is formed through the sidewall of the second headrest linkage piece 42. The axis of the retaining groove 421 coincides with the axis of the hinge point between the second headrest linkage piece 42 and the first headrest linkage piece 41. A retaining rod 411 protrudes from the outer sidewall of the first headrest linkage piece 41 and is slidably connected to the retaining groove 421. The axes of the retaining rod 411, the hinge point between the first headrest linkage piece 41 and the backrest connecting rod 22, and the hinge point between the first headrest linkage piece 41 and the second headrest linkage piece 42 are aligned. The retaining rod 411 is fitted with a plastic wear-resistant sleeve 412. The retaining rod 411 is a retaining bolt that extends through the sleeve and is threadedly connected to the first headrest linkage piece 41. The nut of the retaining bolt abuts the end surface of the sleeve.

[0037] The implementation principle of the sofa with the headrest and backrest linkage adjustment function in the embodiment of the present application is as follows: when the sofa switches from a sitting position to a TV position, the angle between the backrest connecting rod 22 and the backrest connecting member 21 does not change much, and the angle change can be ignored, so that the first headrest linkage piece 41 and the backrest connecting member 21 can be regarded as relatively stationary, and the limiting rod 411 is located at the front end of the limiting groove 421; when the sofa switches from a TV position to a lying position, the front side of the backrest connecting member 21 tilts up and the back side of the backrest connecting member 21 flips down, thereby increasing the angle between the backrest connecting member 21 and the backrest connecting rod 22. During this process, the second headrest linkage piece 41 and the backrest connecting member 21 are tilted up and the back side of the backrest connecting member 21 flips down. The upper part of the movable plate 42 swings rearward relative to the backrest connecting member 21, thereby pulling the front side of the linkage reversing rod 44 to swing downward relative to the backrest frame 23 through the first headrest linkage rod 43, and the rear side of the linkage reversing rod 44 swings upward relative to the backrest frame 23, and then pushes the lower end of the second headrest rod 32 to flip upward relative to the backrest frame 23 through the second headrest linkage rod 45, thereby realizing the upper part of the first headrest rod 31 to swing forward relative to the backrest frame 23, thereby forming a protrusion on the support surface of the backrest frame 23 for the user's head to rest on, and when the limit rod 411 is located at the rear end of the limit slot 421, the backrest frame 23 stops swinging (refer to Figure 5).

[0038] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A sofa with a headrest and backrest linkage adjustment function, comprising a base (1) and a backrest assembly (2), wherein the base (1) is movably connected to a side panel (11) and a backrest linkage piece (12) hinged to the side panel (11), and the backrest assembly (2) comprises a backrest connector (21) and a backrest connector rod (22), wherein the front end of the backrest connector (21) is hinged to the upper position of the rear end of the side panel (11), the upper end of the backrest connector rod (22) is hinged to the rear end of the backrest connector (21), and the lower end of the backrest connector rod (22) is hinged to the backrest linkage piece (12), and the backrest connector (21), the backrest connector rod (22), the backrest linkage piece (12) and the side panel (11) form a four-rod structure, and the base (1) is provided with a driving member for driving the side panel (11) to swing so that the backrest frame (23) is switched to a lying position, characterized in that: The backrest connecting member (21) is detachably connected to a backrest frame (23); the backrest frame (23) is hingedly connected to a headrest connecting member (3) located above the backrest connecting member (21); and a headrest linkage assembly (4) for forcing the headrest connecting member (3) to flip relative to the backrest frame is provided between the backrest connecting rod (22) and the headrest connecting member (3).

2. A sofa with headrest and backrest linkage adjustment function according to claim 1, characterized in that: The headrest connecting member (3) comprises a first headrest rod (31) whose lower portion is hinged to a backrest frame (23) and a second headrest rod (32) fixedly connected to the lower end of the first headrest rod (31); the headrest linkage assembly (4) comprises a first headrest linkage piece (41), a second headrest linkage piece (42), a first headrest linkage rod (43), a linkage reversing rod (44) and a second headrest linkage rod (45); the lower portion of the first headrest linkage piece (41) is hinged to the backrest connecting rod (22); the lower front side of the second headrest linkage piece (42) is hinged to the backrest connecting rod (22); The second headrest linkage piece (21) has a rear side of a lower portion hinged to an upper portion of the first headrest linkage piece (41), a lower portion of the first headrest linkage rod (43) is hinged to an upper portion of the second headrest linkage piece (42), a middle portion of a linkage reversing rod (44) is hinged to a backrest frame (23), a front side of the linkage reversing rod (44) is hinged to an upper portion of the first headrest linkage rod (43), a rear side of the linkage reversing rod (44) is hinged to a lower portion of a second headrest linkage rod (45), and an upper portion of the second headrest linkage rod (45) is hinged to a lower portion of a second headrest rod (32).

3. The sofa with headrest and backrest linkage adjustment function according to claim 2, characterized in that: The backrest frame (23) is detachably connected to a mounting plate (24), the first headrest rod (31) is hinged to the upper portion of the mounting plate (24), and the linkage reversing rod (44) is hinged to the lower portion of the mounting plate (24).

4. The sofa with headrest and backrest linkage adjustment function according to claim 2, characterized in that: The backrest frame (23) is fixed to the backrest connecting member (21) by means of bolts, and the hinged portion of the second headrest linkage piece (42) and the first headrest linkage rod (43) is connected by means of bolt and nut matching.

5. The sofa with headrest and backrest linkage adjustment function according to claim 2, characterized in that: The second headrest linkage piece (42) is provided with a limiting groove (421) arranged in an arc shape, the axis of the limiting groove (421) coincides with the axis of the hinge point of the second headrest linkage piece (42) and the first headrest linkage piece (41), and the first headrest linkage piece (41) is protrudingly provided with a limiting rod (411) slidably connected to the limiting groove (421).

6. The sofa with headrest and backrest linkage adjustment function according to claim 5, characterized in that: The fixing sleeve of the limiting rod (411) is provided with a wear-resistant sleeve (412).

7. The sofa with headrest and backrest linkage adjustment function according to claim 6, characterized in that: The limiting rod (411) is a limiting bolt, the limiting bolt is inserted into the wear-resistant sleeve (412), the limiting bolt is threadedly connected to the first headrest linkage piece (41), and the nut of the limiting bolt abuts against the end surface of the wear-resistant sleeve (412).

8. The sofa with headrest and backrest linkage adjustment function according to claim 1, characterized in that: The backrest frame (23) is a wooden frame.

Images