SOFA WITH ADJUSTABLE COUPLED HEADREST AND BACKREST

Abstract

A sofa with adjustable coupled headrest and backrest includes a base movably connected with a side panel and a coupling sheet for backrest hinged at the side panel, and a backrest assembly including a connection element of backrest with a front end hinged at a rear end of the side panel at an upper positionn and a connection rod of backrest with an upper end hinged at a rear end of the connection element of backrest, and with a lower end hinged at the coupling sheet for backrest, the base is provided with a drive member to switch a backrest frame to a lying position, and a coupling assembly for headrest configured to force the connection element for headrest to flip relative to a backrest skeleton is provided between the connection rod of backrest and the connection element for headrest.

Claims

1. A sofa with adjustable coupled headrest and backrest, comprising a base and a backrest assembly, wherein the base is movably connected with a side panel and a coupling sheet for backrest configured to be hinged at the side panel, the backrest assembly comprises a connection element of backrest and a connection rod of backrest, wherein a front end of the connection element of backrest is hinged on a rear end of the side panel at an upper position, an upper end of the connection rod of backrest is hinged at a rear end of the connection element of backrest, a lower end of the connection rod of backrest is hinged at the coupling sheet for backrest, wherein the connection element of backrest, the connection rod of backrest, the coupling sheet for backrest and the side panel form a four-bar linkage structure, the base is provided with a drive member configured for driving the side panel to swing, so that a backrest frame is switched to be in a lying position, wherein the connection element of backrest is detachably connected with the backrest frame, the backrest frame is hinged with a connection element for headrest located above the connection element of backrest, and a coupling assembly for headrest configured to force the connection element for headrest to flip relative to a backrest skeleton is provided between the connection rod of backrest and the connection element for headrest.

2. The sofa with adjustable coupled headrest and backrest according to claim 1, wherein the connection element for headrest comprises a first headrest rod hinged at the backrest frame at a lower part of the first headrest rod and a second headrest rod fixedly connected to a lower end of the first headrest rod, wherein the coupling assembly for headrest comprises a first coupling sheet for headrest, a second coupling sheet for headrest, a first headrest linkage, a reversing link and a second headrest linkage, a lower part of the first coupling sheet for headrest is hinged at the connection rod of backrest, a lower part of the second coupling sheet for headrest is at a front side of the second coupling sheet hinged at the connection element of backrest, the lower part of the second coupling sheet for headrest is at a rear side of the second coupling sheet hinged at an upper part of the first coupling sheet for headrest, a lower part of the first headrest linkage is hinged at an upper part of the second coupling sheet for headrest, a middle part of the reversing link is hinged at the backrest frame, a front side of the reversing link is hinged at an upper part of the first headrest linkage, a rear side of the reversing link is hinged at a lower part of the second headrest linkage, and an upper part of the second headrest linkage is hinged at a lower part of the second headrest rod.

3. The sofa with adjustable coupled headrest and backrest according to claim 2, wherein the backrest frame is detachably connected with a mount sheet, the first headrest rod is hinged at an upper part of the mount sheet, and the reversing link is hinged at a lower part of the mount sheet.

4. The sofa with adjustable coupled headrest and backrest according to claim 2, wherein the backrest frame is locked and fixed on the connection element of backrest by bolts, and the second coupling sheet for headrest is hinged with the first headrest linkage by a matching of bolt and nut.

5. The sofa with adjustable coupled headrest and backrest according to claim 2, wherein the second coupling sheet for headrest is configured with an arc-shaped limit slot, an axis of the arc-shaped limit slot coincides with a hinge axis of the second coupling sheet for headrest and the first coupling sheet for headrest, and the first coupling sheet for headrest is provided with a limit rod configured to be slidable in the arc-shaped limit slot and protrudes from the first coupling sheet for headrest.

6. The sofa with adjustable coupled headrest and backrest according to claim 5, wherein a wear-resistant sleeve is fixedly sleeved on the limit rod.

7. The sofa with adjustable coupled headrest and backrest according to claim 6, wherein the limit rod is a limit bolt configured to pass through the wear-resistant sleeve, wherein the limit bolt is in a threaded connection with the first coupling sheet for headrest, and a nut of the limit bolt abuts against an end surface of the wear-resistant sleeve.

8. The sofa with adjustable coupled headrest and backrest according to claim 1, wherein the backrest frame is a wooden frame.

Description

DESCRIPTION OF THE DRAWINGS

[0027] FIG. 1 is a schematic view showing the overall structure of a sofa with adjustable coupled headrest and backrest;

[0028] FIG. 2 is a structural schematic diagram of the sofa in a TV pose;

[0029] FIG. 3 is a schematic structural diagram of the coupling assembly for headrest;

[0030] FIG. 4 is a schematic diagram of the connection structure of the first coupling sheet for headrest and the second coupling sheet for headrest;

[0031] FIG. 5 is a structural schematic diagram of the sofa in a lying position.

DETAILED EMBODIMENTS

[0032] The disclosure will be further described in detail below in combination with FIGS. 1-5.

[0033] Referring to FIG. 1 and FIG. 2, an embodiment of the application discloses a sofa with adjustable coupled headrest and backrest including a base 1 and a backrest assembly 2, the base 1 is movably connected with a side panel 11 and a coupling sheet for backrest 12 hinged at the side panel 11. The backrest assembly 2 includes a connection element of backrest 21 and a connection rod of backrest 22, the front end of the connection element of backrest 21 is hinged at the rear end of the side panel 11 at an upper position, the upper end of the connection rod of backrest 22 is hinged at the rear end of the connection element of backrest 21, the lower end of the connection rod of backrest 22 is hinged at the coupling sheet for backrest 12. The connection element of backrest 21, the connection rod of backrest 22, the coupling sheet for backrest 12 and the side panel 11 form a four-bar linkage structure. The base 1 is provided with a drive member for driving the side panel 11 to swing, so that the backrest frame 23 is switched from a TV pose to a lying position. In this embodiment, the base 1 adopts the overall structure of an extension device for a functional sofa disclosed in the granted Chinese patent CN217658890U. The base 1, the side panel 11, the coupling sheet for backrest 12, the backrest assembly 2 and the drive member are all existing technologies and are not described in detail here.

[0034] The upper part of the connection element of backrest 21 is detachably connected with a backrest frame 23 by means of bolts. In the present embodiment, the backrest frame 23 is a wooden frame, and the upper part of the connection element of backrest 21 extends to the inner cavity of the backrest frame 23. The inner wall of the backrest frame 23 is detachably connected with a mount sheet 24 by means of bolts. The upper part of the mount sheet 24 is provided with a connection element for headrest 3 located above the connection element of backrest 21. The connection element for headrest 3 includes a first headrest rod 31 articulated at the lower part to the mount sheet 24, a second headrest rod 32 fixedly connected to the lower end of the first headrest rod 31, and a mount plate for headrest 33 fixedly connected to the front side of the free end of the first headrest rod 31. The plate surface of the mount plate for headrest 33 is parallel to the front surface of the backrest frame 23. The mount plate for headrest 33 is configured for mounting a support plate for headrest (not shown in the figure).

[0035] Referring to FIG. 2 and FIG. 3, a coupling assembly for headrest 4 configured for driving the connection element for headrest 3 to flip relative to the backrest skeleton is provided between the connection rod of backrest 22 and the second headrest rod 32. The coupling assembly for headrest 4 includes a first coupling sheet for headrest 41, a second coupling sheet for headrest 42, a first headrest linkage 43, a reversing link 44 and a second headrest linkage 45. The lower part of the first coupling sheet for headrest 41 is hinged at the middle part of the connection rod of backrest 22, the lower part of the second coupling sheet for headrest 42 at the front side is hinged at the connection element of backrest 21, and the lower part of the second coupling sheet for headrest 42 at the rear side is hinged at the upper part of the first coupling sheet for headrest 41. The lower part of the first headrest linkage 43 is hinged at the upper part of the second coupling sheet for headrest 42, the reversing link 44 is located between the second coupling sheet for headrest 42 and the second headrest rod 32, the middle part of the reversing link 44 is hinged at the lower part of the mount sheet 24, the front side of the reversing link 44 is hinged at the upper part of the first headrest linkage 43, the rear side of the reversing link 44 is hinged on the lower part of the second headrest linkage 45, and the upper part of the second headrest linkage 45 is hinged at the lower part of the second headrest rod 32. In particular, the second coupling sheet for headrest 42 is hinged with the first headrest linkage 43 by the fit of bolt and nut, which facilitates the disassembly of the second coupling sheet for headrest 42 and the first headrest linkage 43.

[0036] Referring to FIG. 3 and FIG. 4, the side wall of the second coupling sheet for headrest 42 is configured with an arc-shaped limit slot 421 which passes through the side wall, the axis of the limit slot 421 coincides with the hinge axis of the second coupling sheet for headrest 42 and the first coupling sheet for headrest 41. The first coupling sheet for headrest 41 is provided with a limit rod 411 which protrudes out of the outer wall thereof and is slidable in the limit slot 421. The projection of the axis of the limit rod 411, of the hinge axis between the first coupling sheet for headrest 41 and the connection rod of backrest 22, and of the hinge axis between the first coupling sheet for headrest 41 and the second coupling sheet for headrest 42 on the plane where the first coupling sheet for headrest is located are in a straight line. The limit rod 411 is sleeved by a wear-resistant sleeve 412. The wear-resistant sleeve 412 is a plastic sleeve. The limit rod 411 is a limit bolt configured to pass through the wear-resistant sleeve 412, the limit bolt is in a threaded connection with the first coupling sheet for headrest 41, and the nut of the limit bolt abuts against the end surface of the wear-resistant sleeve 412.

[0037] The implementation principle of the sofa with adjustable coupled headrest and backrest in the embodiment of the present application is as follows: during the switching of the sofa from a sitting position to a TV pose, the angle between the connection rod of backrest 22 and the connection element of backrest 21 is slightly changed, which may be ignored, so that it can be regarded that the first coupling sheet for headrest 41 doesn't move relative to the connection element of backrest 21, and the limit rod 411 is located at the front end of the limit slot 421; during the switching of the sofa from a TV pose to a lying position, the front side of the connection element of backrest 21 tilts upward and the rear side of the connection element of backrest 21 flips downward, so that the angle between the connection element of backrest 21 and the connection rod of backrest 22 is increased. In this process, the upper part of the second coupling sheet for headrest 42 swings rearward relative to the connection element of backrest 21, so that the front side of the reversing link 44 is pulled by the first headrest linkage 43 to swing downward relative to the backrest frame 23, and the rear side of the reversing link 44 to swing upward relative to the backrest frame 23, and in turn the lower end of the second headrest rod 32 is pushed by the second headrest linkage 45 to flip upward relative to the backrest frame 23, so that the upper part of the first headrest rod 31 swings forward relative to the backrest frame 23, so as to form a protrusion on the support surface of the backrest frame 23 for the head of users to lean against. When the limit rod 411 is located at the rear end of the limit slot 421, the backrest frame 23 stops swinging (referring to FIG. 5).

[0038] The above are all preferred embodiments of the application, and do not limit the scope of protection of the application. Therefore, any equivalent changes made based on the structure, shape, and principle of the application shall be covered by the protection scope of the application.

Reference Signs List

[0039] 1 base [0040] 11 side panel [0041] 12 coupling sheet for backrest [0042] 2 backrest assembly [0043] 21 connection element of backrest [0044] 22 connection rod of backrest [0045] 23 backrest frame [0046] 24 mount sheet [0047] 3 connection element for headrest [0048] 31 first headrest rod [0049] 32 second headrest rod [0050] 33 mount plate for headrest [0051] 4 coupling assembly for headrest [0052] 41 first coupling sheet for headrest [0053] 411 limit rod [0054] 412 wear-resistant sleeve [0055] 42 second coupling sheet for headrest [0056] 421 limit slot [0057] 43 first headrest linkage [0058] 44 reversing link [0059] 45 second headrest linkage