A mechanical extension device for seat, headrest and lumbar support

Abstract

The present application relates to a mechanical extension device with three-linkage of a seat, a headrest and a lumbar support, belonging to the technical field of functional sofas, and comprising an iron frame, a seat frame, a driving assembly, a back plug-in part and an extension mechanism. The extension mechanism includes: a back plug-in follower, rotatably arranged on the back plug-in part and used for installing a lumbar support; a linkage plate, rotatably arranged on the iron frame; a pushing assembly, arranged on the seat frame and rotatably connected to the back plug-in part and the linkage plate; and a headrest rotation assembly, arranged on the back plug-in follower and used for driving the headrest to move. In the present application, the driving assembly is started to push the backrest to move, and the headrest and the lumbar support are driven to rotate simultaneously through the linkage plate; then the driving assembly continues to drive the headrest and the lumbar support to continue to rotate together with the backrest, thereby improving the use experience of the sofa.

Description

Technical Field

[0001] The present application relates to the technical field of functional sofas, and in particular to a mechanical extension device for three-linkage of a seat, a headrest and a lumbar support. Background Art

[0002] A multifunctional sofa is a sofa which not only has the function of a sofa but can also be used for other purposes. Existing functional sofas include a movable backrest, i.e. a seat, a headrest and a lumbar support.

[0003] Existing sofas generally include a seat frame movably arranged on an iron frame, a footrest assembly, and a back plug-in unit arranged on the seat frame and used to be connected to the backrest. The iron frame is also provided with a driving assembly for driving the footrest assembly to move so that the seat frame and the back plug-in unit move. The driving assembly is started to open the footrest assembly, and the opening of the footrest assembly causes the seat frame to tilt and move downward, so that the sofa is converted from a sitting position to a TV position. Then the driving assembly continues to start to cause the seat frame to continue to tilt and move upward, so that the backrest rotates downward and is laid down, so as to achieve conversion from a TV position to a lying position. The sofa also includes a headrest and a lumbar support. An independent electric or manual headrest device and an independent electric or manual lumbar support device are independently installed on the sofa. Therefore, when the driving assembly, the electric headrest device and the electric lumbar support device are started, the backrest, the seat frame and the backrest are all independently controlled to move without interfering with each other.

[0004] During the operation of the sofa, if you choose to use the manual control function, manual operation is more laborious, and it is not convenient to adapt the position change of the headrest to the posture change of the movable seat, which reduces the user experience of the sofa; if you choose to use the electric control function, the three devices move independently, so each device needs to be equipped with a motor to drive the device to operate, which complicates the control of the mechanism and is inconvenient for users to operate, thereby reducing the user experience of the sofa. Summary of the invention

[0005] In order to improve the user experience of the sofa, the present application provides a three-link mechanical extension device of a seat, a headrest and a lumbar support.

[0006] The present application provides a seat, headrest, and lumbar support three-link mechanical extension device, which adopts the following technical solution:

[0007] A mechanical extension device for a seat, a headrest and a lumbar support, comprising an iron frame, a driving assembly, a back plug-in, and a seat frame movably connected to the iron frame through a follower mechanism and used to connect a footrest assembly, wherein the iron frame and the seat frame are provided with an extension mechanism for connecting the headrest and the lumbar support, and the extension mechanism comprises:

[0008] A back-insertion follower, which is rotatably disposed on the back-insertion plug and is used to install a lumbar support;

[0009] A linkage plate, wherein the linkage plate is rotatably arranged on the iron frame through a rotating shaft and the two ends of the linkage plate are located on both sides of the rotating shaft;

[0010] A pushing assembly, the pushing assembly is arranged on the seat frame and is rotatably connected to the back plug and one end of the linkage plate, and one end of the linkage plate away from the pushing assembly is rotatably connected to the back plug follower through the linkage assembly;

[0011] A headrest rotating assembly is arranged on the back-inserted driven member and is used for driving the headrest to move.

[0012] By adopting the above technical solution, when converting from a sitting posture to a TV posture, the driving assembly is started to drive the footrest assembly to open, and the opening of the footrest assembly drives the seat frame to move together, and the seat frame drives the back plug-in unit and the backrest and the pushing unit to tilt downward and move in a direction away from the wall that contacts the backrest, and the pushing unit drives the top end of the linkage plate to rotate downward to avoid the position, so that the backrest moves downward and away from the wall without rotating, so that the backrest and the wall form an avoidance space for avoiding the position when the backrest is laid down, and the rotation of the linkage plate drives the back plug-in follower and the lumbar support to rotate through the linkage unit, and the rotation of the back plug-in follower also drives the headrest to rotate through the headrest rotating unit, so that the headrest and the lumbar support rotate simultaneously, so that the lumbar support and the headrest are converted from the retracted state to the opened state;

[0013] When converting from TV posture to lying posture, the footrest assembly has been fully opened and the seat frame is locked, so that the seat frame cannot continue to tilt downward, and the driving assembly continues to start to drive the footrest assembly and the seat frame to continue to move, so that the seat frame tilts upward under the action of the follower mechanism, and the tilt downward movement in the previous stage is converted into tilt upward movement in the direction away from the wall that contacts the backrest. Therefore, the linkage plate continues to rotate downward to drive the pushing assembly to continue to move downward, and the tilt upward movement of the seat frame pulls the back plug-in and the backrest downward to rotate, so as to realize the folding of the backrest. At the same time, the rotation of the linkage plate continues to drive the headrest and the lumbar support to continue to rotate with the backrest, thereby realizing the three-link state of the seat, headrest and lumbar support, thereby improving the user experience of the sofa, and at the same time, the linkage plate makes the headrest and lumbar support rotate in the opposite direction to the backrest through the linkage plate, thereby further improving the sensitivity during adjustment, thereby further improving the user experience of the sofa; and multiple linkages can be realized by using one driving assembly, thereby reducing the cost of sofa materials.

[0014] Optionally, the pushing component:

[0015] A fixing plate, the fixing plate being arranged on the seat frame and extending to the outside of the seat frame;

[0016] A support plate, the support plate being rotatably disposed on the back plug-in;

[0017] The connecting plate is rotatably arranged on the fixed plate and is rotatably connected to the top end of the linkage plate and the bottom end of the support plate at both ends.

[0018] By adopting the above technical solution, when the seat frame moves and pushes the top end of the linkage plate to rotate downward, the seat frame tilts downward and moves away from the seat frame, so that the seat frame, the connecting plate, the support plate and the back plug-in move downward simultaneously, so as to realize that the backrest moves with the linkage plate without rotating; when the seat frame tilts upward and moves away from the seat frame, the movement of the seat frame pulls the connecting plate to move and rotate through the fixed plate, the rotation of the connecting plate pulls the back plug-in to rotate downward through the support plate, and the rotation of the connecting plate continues to push the linkage plate to rotate, so as to realize the reclining of the backrest, thereby realizing the control of the backrest movement and anti-fall.

[0019] Optionally, the linkage assembly includes:

[0020] The back plug-in connecting piece is arranged on the linkage plate;

[0021] The lower end support is rotatably arranged at both ends on the back plug-in connecting piece and the back plug-in driven piece.

[0022] By adopting the above technical solution, the rotation of the linkage plate drives the rotation of the back plug-in connecting piece, and the rotation of the back plug-in connecting piece pulls the rotation of the back plug-in driven piece, so as to realize the opening of the headrest and the lumbar support.

[0023] Optionally, both the connecting plate and the lower end support are located above the linkage plate, the back plug-in connecting piece is provided with an upwardly inclined bending part, and the lower end support is rotatably connected to the top end of the bending part.

[0024] By adopting the above technical solution, both the connecting plate and the lower end support are located above the linkage plate, so that the connecting plate and the lower end support are located above the rotation point, thereby reducing the probability that the connecting plate and the lower end support rotate out of the sofa and collide with the ground. At the same time, the bending part further reduces the probability of collision, so the use experience of the sofa is improved.

[0025] Optionally, the headrest rotation assembly includes:

[0026] The headrest fixing piece is used for connecting with the backrest;

[0027] The upper headrest driven piece and the lower headrest driven piece, one end of the upper headrest driven piece and the lower headrest driven piece are rotatably arranged on the headrest fixing piece;

[0028] The headrest driving piece is rotatably connected to the back plug-in driven piece and the lower headrest driven piece at both ends respectively;

[0029] The headrest front support is rotatably arranged on the upper headrest driven piece and the lower headrest driven piece;

[0030] A rear headrest support member rotatably arranged on a follower of the headrest. One ends of the front headrest support member and the rear headrest support member, which are away from the follower of the headrest, are both used for rotatably connecting with the headrest.

[0031] By adopting the above technical solution, the linkage plate drives the back-inserted follower to rotate through the linkage assembly, and the back-inserted follower pushes the headrest driving member upward. The upper follower of the headrest, the lower follower of the headrest, the front headrest support member and the rear headrest support member form two connected quadrilateral structures. Therefore, when the headrest driving member moves upward, it compresses the two quadrilateral structures and also pushes the two quadrilateral structures to rotate upward, so as to open the headrest. Moreover, the two quadrilateral structures are used to support the headrest, so the supporting force of the headrest is improved, thereby further improving the use experience of the sofa.

[0032] Optionally, a fixing post is arranged on the headrest fixing member, and a fixing groove and a limiting groove are formed on the lower follower of the headrest. The fixing post presses against the fixing groove and is used for positioning the position of the headrest; a limiting post is arranged on the back-inserted follower, and the fixing post and the limiting post are located on both sides of the lower follower of the headrest; when the sofa is converted to a lying position, the limiting post presses against the limiting groove and cooperates with the fixing post to clamp the lower follower of the headrest to position the sofa.

[0033] By adopting the above technical solution, the lower follower of the headrest and the upper follower of the headrest rotate upward to open the headrest, and the lower follower of the headrest approaches the fixing post, so that the fixing post presses against the fixing groove for positioning. Therefore, the lower follower of the headrest and the upper follower of the headrest cannot continue to rotate, so as to limit the position of the headrest; when converting from the TV position to the lying position, the back-inserted follower pulls the lower follower of the headrest close to the limiting post. When completely converted to the lying position, the limiting post also presses against the lower follower of the headrest and cooperates with the fixing post to clamp the lower follower of the headrest, so as to limit the position of the headrest and the sofa in the lying position, thereby improving the stability of the sofa during use, and thus improving the use experience of the sofa.

[0034] Optionally, the follower mechanism includes:

[0035] A first follower assembly arranged on the iron frame and rotatably connected with the seat frame;

[0036] A second follower assembly rotatably arranged on the seat frame, rotatably connected with the first follower assembly and connected with the ottoman assembly; when converting from the sitting position to the TV position, the ottoman assembly pushes the seat frame to tilt downward through the second follower assembly to avoid the rotation of the linkage plate and position the seat frame after being fully opened; when converting from the TV position to the lying position, the seat frame moves upward obliquely under the action of the first follower assembly.

[0037] By adopting the above technical solution, when switching from the sitting position to the TV position, the footrest assembly rotates to the outside of the sofa and opens, pushing the second follower assembly to operate. The second follower assembly pushes the seat frame to tilt downward and move away from the wall side, so as to achieve the avoidance position of the top end of the linkage plate tilting downward. After switching to the TV position, the footrest assembly is also fully opened, and the footrest assembly cannot continue to rotate, causing the second follower assembly to be locked. Therefore, after the footrest assembly and the seat frame continue to move together, the first follower assembly starts to drive the seat frame to tilt upward and move, so as to change the moving direction of the seat frame.

[0038] Optionally, the first follower assembly includes:

[0039] A first drive plate and a second drive plate, both the first drive plate and the second drive plate are rotatably arranged on the iron frame and are spaced apart;

[0040] A first follower rod, the first follower rod is rotatably arranged on the first drive plate;

[0041] A second follower rod, the second follower rod is rotatably arranged on the second drive plate;

[0042] A first follower plate, the first follower plate is rotatably arranged on the first follower rod and the second follower rod;

[0043] A connecting follower plate, both ends of the connecting follower plate are rotatably connected to the seat frame and the first follower plate respectively and are used for avoiding the position when the seat frame tilts downward;

[0044] A second follower plate, both ends of the second follower plate are rotatably connected to the first follower rod and the second follower rod respectively.

[0045] By adopting the above technical solution, the connecting follower plate avoids the position when the seat frame tilts downward. Therefore, after the seat frame cannot tilt downward, the connecting follower plate is locked and cannot continue to rotate; when switching from the TV position to the lying position, the movement of the seat frame pulls the connecting follower plate to move, the movement of the connecting follower plate drives the first follower plate to tilt upward and move, and the movement of the first follower plate drives the bottom ends of the first follower rod and the second follower rod to tilt upward and rotate, while the top ends of the first drive plate and the second drive plate rotate upward, so as to achieve the upward tilting movement of the seat frame and the second follower assembly together.

[0046] Optionally, the second follower assembly includes:

[0047] A follower support member, both ends of the follower support member are rotatably arranged on the seat frame and the first follower plate;

[0048] A follower drive plate, the follower drive plate is arranged on the footrest assembly;

[0049] A follower connecting plate, both ends of the follower connecting plate are rotatably connected to the follower drive plate and the follower support member respectively.

[0050] By adopting the above technical solution, when the footrest assembly rotates and opens, it pushes the follower drive plate to rotate downward, and the follower drive plate drives the connection part between the follower support and the seat frame to rotate downward through the follower connecting plate, so that the seat frame tilts downward, thereby realizing a certain downward tilt of the seat frame.

[0051] Optionally, two stretching mechanisms are arranged at intervals and are connected to the lumbar support through two connecting components. The connecting components include:

[0052] A lumbar support connecting piece, which is arranged on the back plug follower;

[0053] A lumbar support pillar, which is arranged on the lumbar support connecting piece and is used to connect with the lumbar support.

[0054] In summary, the present application includes at least one of the following beneficial technical effects:

[0055] The driving component is started to drive the seat frame, the backrest, and the pushing component to move downward together. The pushing component pushes the top end of the linkage plate to rotate downward for avoidance, so that the backrest moves downward and away from the wall without rotating, thereby forming an avoidance space between the backrest and the wall. The linkage plate rotates to drive the headrest and the lumbar support to rotate simultaneously; when switching from the TV position to the lying position, the driving component continues to drive the seat frame to tilt upward, thereby pulling the back plug-in and the backrest to rotate downward, so as to realize the reclining of the backrest. At the same time, the linkage plate continues to drive the headrest and the lumbar support to continue to rotate together with the backrest, thus realizing the three-linkage state of the seat, the headrest, and the lumbar support, thereby improving the use experience of the sofa. Description of the Drawings

[0056] Figure 1 is a three-dimensional structural schematic diagram of the present application;

[0057] Figure 2 is a structural schematic diagram of the footrest assembly of the present application after being opened;

[0058] Figure 3 is a structural schematic diagram of the sofa in the sitting position of the present application;

[0059] Figure 4 is a structural schematic diagram of the sofa in the TV position of the present application;

[0060] Figure 5 is a structural schematic diagram of the sofa in the lying position of the present application, in which the headrest driving part is interrupted to show the limit column;

[0061] Figure 6 is Figure 5 an enlarged schematic diagram of part A in

[0062] Figure 7It is a schematic structural diagram of the linkage component and the headrest rotation component in this application.

[0063] Reference numerals: 1, iron frame; 11, seat frame; 12, rotating shaft; 13, mounting plate; 14, backrest side plate; 2, footrest component; 21, first connecting rod; 22, second connecting rod; 23, third connecting rod; 24, fourth connecting rod; 25, footrest plate; 26, fixed rod; 3, driving component; 31, driving connecting plate; 32, electric push rod; 4, follower mechanism; 41, first follower component; 42, first driving plate; 43, second driving plate; 44, first follower rod; 441, first mounting column; 45, second follower rod; 451, second mounting column; 46, first follower plate; 47, connecting follower plate; 48, second follower plate; 5, second follower component; 51, follower support; 52, follower driving plate; 53, follower connecting plate; 6, extension mechanism; 61, back plug-in component; 611, connecting part; 612, plug-in part; 613, first shaft; 614, second shaft; 62, back plug-in follower; 621, back plug-in part; 622, third shaft; 623, limit post; 63, linkage plate; 64, pushing component; 65, fixing plate; 66, support plate; 67, connecting plate; 7, linkage component; 71, back plug-in connecting piece; 72, lower end support; 73, bending part; 8, connecting component; 81, lumbar support connecting piece; 82, lumbar support pillar; 9, headrest rotation component; 91, headrest fixing piece; 92, upper headrest follower; 93, lower headrest follower; 931, fixing groove; 932, limit groove; 94, headrest driving piece; 95, front headrest support; 96, rear headrest support; 97, fixing column. Detailed implementation manners

[0064] The following will Figure 1-7 describe this application in further detail with reference to the attached

[0065] The embodiment of this application discloses a mechanical extension device with three-linkage of a seat, a headrest and a lumbar support.

[0066] Refer to Figure 1 , the mechanical extension device with three-linkage of a seat, a headrest and a lumbar support includes an iron frame 1, a seat frame 11 which is movably connected to the iron frame 1 through a follower mechanism 4 and is used for connecting a footrest component 2, a driving component 3 is arranged on the iron frame 1 for driving the seat frame 11 and the footrest component 2 to move, and at the same time, an extension mechanism 6 for connecting with a headrest and a lumbar support is arranged on the iron frame 1 and the seat frame 11.

[0067] Refer to Figure 1 and Figure 2, the footrest assembly 2 is located at one end of the seat frame 11 and is horizontally spaced apart in two, and the footrest assembly 2 is a four-link structure and is in a scissor shape. The footrest assembly 2 includes a first connecting rod 21, a second connecting rod 22, a third connecting rod 23, a fourth connecting rod 24, and a footrest plate 25. The tops of the first connecting rod 21 and the second connecting rod 22 are rotatably installed on the side wall of the seat frame 11, and the bottoms extend obliquely downward below the seat frame 11. The first connecting rod 21 and the second connecting rod 22 are both arranged at intervals and in parallel, and the first connecting rod 21 is located on the side closer to the inside of the sofa of the second connecting rod 22; one end of the third connecting rod 23 is rotatably installed on the bottom end of the first connecting rod 21 and is rotatably connected to the second connecting rod 22, and one end of the fourth connecting rod 24 is rotatably installed on the bottom end of the second connecting rod 22 and is arranged in parallel with the third connecting rod 23; the footrest plate 25 is rotatably installed at the ends of the third connecting rod 23 and the fourth connecting rod 24 away from the first connecting rod 21, and the footrest plate 25 is used to support the feet. Each component of the footrest assembly 2 cooperates to form two quadrilateral structures.

[0068] Referring to Figure 1 , the driving assembly 3 is arranged on the iron frame 1 and is connected to the footrest assembly 2. At the same time, the driving assembly 3 is used to drive the footrest assembly 2 and the seat frame 11 to move together; the driving assembly 3 includes a driving connecting plate 31 and an electric push rod 32. The side walls on the opposite sides of the two second connecting rods 22 are fixedly connected together through a fixing rod 26; the driving connecting plate 31 is fixedly installed on the iron frame 1 and is located between the two footrest assemblies 2. At the same time, the driving connecting plate 31 is located on the side of the seat frame 11 away from the footrest assembly 2; the body of the electric push rod 32 is rotatably installed on the driving connecting plate 31, and the piston rod of the electric push rod 32 is rotatably connected to the fixing rod 26. When the electric push rod 32 is started, it drives the fixing rod 26 to move. The movement of the fixing rod 26 drives the second connecting rod 22 to rotate, so that the footrest assembly 2 rotates to the outside of the sofa. At the same time, the movement of the fixing rod 26 also drives the seat frame 11 to move together. When the electric push rod 32 moves back, it can drive the seat frame 11 to move back and make the footrest assembly 2 move back and retract into the sofa, so as to realize the opening or retraction of the footrest assembly 2 into the sofa.

[0069] Referring to Figure 1 and Figure 3 , the follow-up mechanism 4 is connected to the footrest assembly 2 to move. The follow-up mechanism 4 includes a first follow-up component 41 and a second follow-up component 5. The first follow-up component 41 is arranged on the iron frame 1 and is rotatably connected to the seat frame 11. The second follow-up component 5 is rotatably arranged on the seat frame 11, and the second follow-up component 5 is rotatably connected to the first follow-up component 41 and is connected to the footrest assembly 2.

[0070] Referring to Figure 1 , Figure 3 and Figure 4, when switching from the sitting position to the TV position, the footrest assembly 2 is opened, and through the second follower assembly 5, the seat frame 11 tilts downward and moves away from the wall surface in contact with the backrest. After the footrest assembly 2 is fully opened, it cannot move, thereby locking the position of the seat frame 11. During the process of switching from the TV position to the lying position, the electric push rod 32 continues to operate, and through the first follower assembly 41, the seat frame 11 tilts upward and moves away from the wall surface in contact with the backrest.

[0071] Refer to Figure 4 and Figure 5 , the first follower assembly 41 includes a first driving plate 42, a second driving plate 43, a first follower rod 44, a second follower rod 45, a first follower plate 46, a connecting follower plate 47, and a second follower plate 48. The first driving plate 42 and the second driving plate 43 are both rotatably installed on the iron frame 1 and are spaced apart along the moving direction of the seat frame 11 tilting upward. At the same time, the tops of the first driving plate 42 and the second driving plate 43 extend upward to the lower side of the seat frame 11, and the first driving plate 42 is located on the side closer to the second driving plate 43 away from the footrest assembly 2; one end of the first follower rod 44 is rotatably installed on the top of the first driving plate 42, and the other end of the first follower rod 44 is inclined downward; one end of the second follower rod 45 is rotatably installed on the top of the second driving plate 43, and the second follower rod 45 is inclined downward.

[0072] Refer to Figure 4 and Figure 5 , one end of the first follower plate 46 is rotatably installed on the bottom end of the first follower rod 44, and the first follower plate 46 extends to the bottom end of the second follower rod 45 and is rotatably connected to the bottom end of the second follower rod 45; the top end of the connecting follower plate 47 is rotatably installed on the side wall of the seat frame 11, and the bottom end of the connecting follower plate 47 is inclined downward and is rotatably connected to the end of the first follower plate 46 away from the first follower rod 44. At the same time, the connecting follower plate 47 is located on the side of the first driving plate 42 and the second driving plate 43 close to the footrest assembly 2, and the connecting follower plate 47 is used for avoiding position when the seat frame 11 tilts downward. After switching to the TV position, the connecting follower plate 47 rotates to the limit position and cannot rotate. Therefore, when the seat frame 11 tilts upward, the connecting follower plate 47 moves together with the seat frame 11; a first mounting post 441 is fixedly installed on the first follower rod 44 and between the top end and the bottom end of the first follower rod 44, and a second mounting post 451 is fixedly installed on the second follower rod 45 and between the top end and the bottom end of the second follower rod 45; both ends of the second follower plate 48 are rotatably installed on the first mounting post 441 and the second mounting post 451.

[0073] Refer to Figure 4 and Figure 5, the second follower assembly 5 includes a follower support 51, a follower drive plate 52, and a follower connecting plate 53. One end of the follower support 51 is rotatably mounted on the seat frame 11, and the other end of the follower support 51 is rotatably mounted on one end of the first follower plate 46 close to the first follower rod 44; the follower drive plate 52 is fixedly mounted on the top end of the first connecting rod 21, and both ends of the follower connecting plate 53 are respectively rotatably connected to the follower drive plate 52 and the follower support 51. At the same time, the length of the follower drive plate 52 is shorter than the length of the first connecting rod 21, so as to reduce the rotation angle of the follower drive plate 52 driving the follower connecting plate 53; when the footrest assembly 2 is retracted, the bottom end of the first connecting rod 21 is located on the side of the follower drive plate 52 close to the inside of the sofa.

[0074] Referring to Figure 4 and Figure 5 , when the footrest assembly 2 is opened, the top end of the first connecting rod 21 and the follower drive plate 52 first rotate upward, so that the top end of the follower connecting plate 53 rotates upward for avoiding interference, and then the top end of the first connecting rod 21 and the follower drive plate 52 rotate downward. The follower driving member drives the top end of the follower support 51 and the seat frame 11 to rotate downward through the follower connecting plate 53, and the top end of the connecting follower plate 47 rotates downward for avoiding interference. At the same time, the seat frame 11 also moves in a direction away from the wall surface in contact with the backrest; after being converted to the TV position, the footrest assembly 2 is fully opened, and the first connecting rod 21 cannot continue to rotate. Therefore, the seat frame 11 is locked by the first connecting rod 21 and cannot continue to move downward. Then, the electric push rod 32 is started to drive the footrest assembly 2 and the seat frame 11 to move together, and at the same time, the follower support 51 and the follower connecting plate 53 rotate together, so as to pull the first follower plate 46, the first drive plate 42, the second drive plate 43, and the second follower plate 48 to rotate upward together, so as to realize the upward lifting of the seat frame 11, so that the seat frame 11 moves obliquely upward, so as to be converted to the lying position.

[0075] Referring to Figure 5 and Figure 6 , a vertical mounting plate 13 is fixedly mounted on the upper surface of the end of the seat frame 11 away from the footrest assembly 2, and two mounting plates 13 are horizontally arranged at intervals. A backrest plug-in member 61 is horizontally and rotatably mounted at the top end of each mounting plate 13. The backrest plug-in member 61 is located on the side of the mounting plate 13 away from the footrest assembly 2, and the backrest plug-in member 61 includes a connecting portion 611 and a plugging portion 612 connected together. One end of the connecting portion 611 is rotatably mounted on the top end of the mounting plate 13, and the plugging portion 612 is located at the end of the connecting portion 611 away from the mounting plate 13 and is inclined upward. At the same time, the plugging portion 612 is used for mounting the backrest, and a first shaft 613 and a second shaft 614 are respectively fixedly mounted on the side walls of the connecting portion 611 and the plugging portion 612.

[0076] Referring to Figure 5 and Figure 6, the axis of rotation of each component in the extension mechanism 6 are all parallel to each other, and there are two extension mechanisms 6 which are respectively arranged in one-to-one correspondence with the two back inserts 61; the extension mechanism 6 includes a back-insert driven member 62, a linkage plate 63, and a pushing component 64. One end of the back-insert driven member 62 is rotatably installed on the first shaft 613 and the other end extends to the side of the back insert 61 away from the footrest assembly 2. At the same time, an inclined upward back-insert portion 621 is integrally provided at the end of the back-insert driven member 62 away from the first shaft 613. At the same time, the axis of rotation of the back-insert driven member 62 and the back insert 61 are parallel to each other.

[0077] Refer to Figure 5 and Figure 6 , a rotating shaft 12 is fixedly installed on the iron frame 1 and below the seat frame 11, and the axes of the rotating shaft 12, the first shaft 613, and the second shaft 614 are parallel to each other; the linkage plate 63 is rotatably installed on the rotating shaft 12, and both ends of the linkage plate 63 are located on both sides of the rotating shaft 12 and are inclined; the pushing component 64 is arranged on the seat frame 11 and is rotatably connected to the top ends of the back insert 61 and the linkage plate 63, and the bottom end of the linkage plate 63 is rotatably connected to the back-insert driven member 62 through a linkage component 7. The linkage component 7 and the pushing component 64 are located on both sides of the rotating shaft 12, and the linkage component 7 is located on the side of the rotating shaft 12 away from the footrest assembly 2.

[0078] Refer to Figure 5 and Figure 6 , the pushing component 64 includes a fixing plate 65, a support plate 66, and a connecting plate 67. The fixing plate 65 is fixedly installed on the upper surface of the seat frame 11, and the fixing plate 65 is located on the side of the mounting plate 13 away from the footrest assembly 2. At the same time, the top end of the fixing plate 65 extends obliquely upward to the outside of the seat frame 11; the top end of the support plate 66 is rotatably installed on the second shaft 614, and the bottom end of the support plate 66 extends downward to the lower part of the back insert 61; the connecting plate 67 is rotatably installed on the top end of the fixing plate 65, and the top end of the connecting plate 67 is rotatably connected to the bottom end of the support plate 66, and the bottom end of the connecting plate 67 is inclined downward, and the bottom end of the connecting plate 67 is arranged toward the side close to the mounting plate 13 and is rotatably connected to the top end of the linkage plate 63.

[0079] Refer to Figure 4 and Figure 6, a third shaft 622 is fixedly installed on the back-inserted follower 62 and between the first shaft 613 and the back-inserted portion 621. The linkage assembly 7 includes a back-inserted connecting member 71 and a lower-end support member 72. One end of the back-inserted connecting member 71 is fixedly installed on the bottom end of the linkage plate 63, and an inclined upward bending portion 73 is provided at the end of the back-inserted connecting member 71 away from the linkage plate 63; both ends of the lower-end support member 72 are rotatably connected to the top end of the bending portion 73 and the third shaft 622 respectively; the lumbar support is connected to the two back-inserted followers 62 through two connecting assemblies 8. The connecting assembly 8 includes a lumbar support connecting member 81 and a lumbar support column 82. The two lumbar support connecting members 81 are fixedly installed on the side walls of the two back-inserted followers 62 on the opposite sides, and the lumbar support connecting member 81 is located between the third shaft 622 and the first shaft 613; the two lumbar support columns 82 are fixedly installed on the side walls of the two lumbar support connecting members 81 on the opposite sides and are used for connecting with the lumbar support; the extension mechanism 6 further includes a headrest rotation assembly 9. The headrest rotation assembly 9 is arranged on the backrest and connected to the back-inserted follower 62, so as to drive the headrest to rotate to open and retract the headrest.

[0080] Refer to Figure 5 , Figure 6 , Figure 7 , when the sofa is converted from the sitting position to the TV position, the seat frame 11 moves downward obliquely, driving the fixed plate 65, the mounting plate 13 and the backrest to move downward obliquely. Therefore, the fixed plate 65 pushes the top end of the linkage plate 63 to rotate downward through the connecting plate 67 for avoidance, so that the back-inserted member 61 and the backrest do not rotate, and the rotation of the linkage plate 63 drives the back-inserted connecting member 71 and the bending portion 73 to rotate upward. Therefore, the back-inserted follower 62 is pushed to rotate upward through the lower-end support member 72. The back-inserted follower 62 rotates upward to push the lumbar support upward to the outside of the backrest. At the same time, the back-inserted follower 62 rotates upward to drive the headrest to rotate through the headrest rotation assembly 9 to open the headrest. When the sofa is converted from the TV position to the lying position, the seat frame 11 moves upward obliquely. The movement of the seat frame 11 pulls the connecting plate 67 and the linkage plate 63 to continue to rotate downward through the fixed plate 65, and the fixed plate 65 drives the back-inserted member 61 to move upward obliquely, so that the back-inserted member 61 rotates downward under the action of the support plate 66 to realize the reclining of the backrest. At the same time, the linkage plate 63 continues to push the back-inserted follower 62 and the lumbar support to rotate upward through the lower-end support member 72, and the headrest also moves at the same time, so as to realize the three-linkage of the backrest, that is, the seat, the headrest and the lumbar support.

[0081] Refer to Figure 3 , Figure 6 , Figure 7, the headrest rotation assembly 9 includes a headrest fixing member 91, an upper headrest follower 92, a lower headrest follower 93, a headrest driving member 94, a front headrest support member 95 and a rear headrest support member 96. The headrest fixing member 91 is fixedly installed on the backrest side plate 14 for installing the backrest, and the headrest fixing member 91 is located on the side of the insertion portion 612 close to the footrest assembly 2 and above the backrest insert 61; one ends of the upper headrest follower 92 and the lower headrest follower 93 are rotatably installed on the headrest fixing member 91 and the other ends extend to the other side of the insertion portion 612, and the lower headrest follower 93 is located below the upper headrest follower 92; the bottom end of the headrest driving member 94 is rotatably installed on the backrest insertion portion 621, and the top end of the headrest driving member 94 is rotatably connected to the lower headrest follower 93.

[0082] Refer to Figure 3 , Figure 6 , Figure 7 , the bottom end of the front headrest support member 95 is rotatably installed on the end of the lower headrest follower 93 away from the headrest fixing member 91, and the front headrest support member 95 extends upward and is rotatably connected to the upper headrest follower 92 and extends above the upper headrest follower 92; the bottom end of the rear headrest support member 96 is rotatably installed on the end of the upper headrest follower 92 away from the headrest fixing member 91. At the same time, the top ends of the front headrest support member 95 and the rear headrest support member 96 are both rotatably connected to the headrest, and the various components in the headrest rotation assembly 9 cooperate to form two quadrilateral structures. The backrest follower 62 rotates upward to push the upper headrest follower 92 and the lower headrest follower 93 to rotate upward and lift through the headrest driving member 94, so that the front headrest support member 95 and the rear headrest support member 96 rotate upward to lift the headrest and open it, so as to realize the opening of the headrest, and the headrest can be retracted by rotating back.

[0083] Refer to Figure 3 , Figure 6 , Figure 7 , a fixing column 97 is fixedly installed on the side wall of the headrest fixing member 91 and between the upper headrest follower 92 and the lower headrest follower 93. A limiting column 623 is fixedly installed at the end of the backrest insertion portion 621 away from the backrest follower 62. The limiting column 623 and the fixing column 97 are located on both sides of the lower headrest follower 93. Fixing grooves 931 and limiting grooves 932 are formed on the opposite side walls of the lower headrest follower 93, and the fixing groove 931 is located on the side of the lower headrest follower 93 close to the fixing column 97; when the headrest is opened, the lower headrest follower 93 moves upward and approaches the fixing column 97. When the headrest opening is completed, the fixing column 97 presses against the fixing groove 931 for positioning. During the process of the backrest being laid down downward, the headrest rotation assembly 9 rotates downward together, so that the lower headrest follower 93 approaches the limiting column 623, and the limiting column 623 presses against the limiting groove 932. Therefore, when the sofa is converted to a lying position, the fixing column 97 and the limiting column 623 press against the lower headrest follower 93 to realize the positioning of the headrest and the lying position.

[0084] The working principle of the embodiments of the present application is as follows:

[0085]

[0086] When the sofa is converted from the sitting position to the TV position, the electric push rod 32 starts to drive the footrest assembly 2 to open. When the footrest assembly 2 opens, it drives the seat frame 11 to move obliquely downward. The downward movement of the seat frame 11 drives the top end of the linkage plate 63 to rotate downward with the seat frame 11 for avoidance, so that the backrest does not rotate and moves away from the wall, thereby leaving an avoidance space for the backrest to rotate downward for avoidance. The rotation of the linkage plate 63 pushes the lumbar support upward to the outside of the backrest, and at the same time drives the headrest to rotate to open the headrest. At the same time, the footrest assembly 2 is fully opened to position the seat frame 11; when the sofa is converted from the TV position to the lying position, the seat frame 11 moves obliquely upward, driving the backrest insert 61 to rotate downward under the action of the support plate 66, so as to realize the reclining of the backrest, and at the same time continue to drive the lumbar support and the headrest to rotate at the same time, so as to realize the three-linkage of the backrest, that is, the seat, the headrest and the lumbar support.

[0086] The above are all the preferred embodiments of the present application. The protection scope of the present application is not limited by this. Therefore, all equivalent changes made according to the structure, shape and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A mechanical extension device for a seat, a headrest and a lumbar support, comprising an iron frame (1), a drive assembly (3), a back plug (61), and a seat frame (11) movably connected to the iron frame (1) through a follower mechanism (4) and used to connect to a footrest assembly (2), characterized in that: An extension mechanism (6) for connecting the headrest and lumbar support is provided on the iron frame (1) and the seat frame (11). The extension mechanism (6) includes: A back-insert driven member (62) which is rotatably arranged on a back-insert member (61) and is used for mounting the lumbar support; A linkage plate (63) which is rotatably arranged on the iron frame (1) through a rotating shaft (12) and both ends are located on both sides of the rotating shaft (12); A pushing component (64) which is arranged on the seat frame (11) and is rotatably connected with the back-insert member (61) and one end of the linkage plate (63). The end of the linkage plate (63) far from the pushing component (64) is rotatably connected with the back-insert driven member (62) through a linkage component (7); A headrest rotating component (9) which is arranged on the back-insert driven member (62) and is used for driving the headrest to move; The follow-up mechanism (4) includes: A first follow-up component (41) which is arranged on the iron frame (1) and is rotatably connected with the seat frame (11); A second follow-up component (5) which is rotatably arranged on the seat frame (11) and is rotatably connected with the first follow-up component (41) and is connected with the footrest component (2). When switching from the sitting position to the TV position, the footrest component (2) pushes the seat frame (11) to tilt downward through the second follow-up component (5) to avoid interfering with the rotation of the linkage plate (63) and positions the seat frame (11) after being fully opened. When switching from the TV position to the lying position, the seat frame (11) moves upward obliquely under the action of the first follow-up component (41); The pushing component (64) includes: A fixing plate (65) which is arranged on the seat frame (11) and extends to the outside of the seat frame (11); A supporting plate (66) which is rotatably arranged on the back-insert member (61); A connecting plate (67) which is rotatably arranged on the fixing plate (65) and both ends are respectively rotatably connected with the top end of the linkage plate (63) and the bottom end of the supporting plate (66).

2. The mechanical extension device with three-linkage of seat, headrest and lumbar support according to claim 1, characterized in that: The linkage component (7) includes: A back-insert connecting member (71) which is arranged on the linkage plate (63); A lower-end supporting member (72) whose both ends are rotatably arranged on the back-insert connecting member (71) and the back-insert driven member (62).

3. The mechanical extension device for the three-linkage of a seat, a headrest, and a lumbar support according to claim 2, characterized in that: Both the connecting plate (67) and the lower-end supporting member (72) are located above the linkage plate (63). An inclined upward bending part (73) is arranged on the back-insert connecting member (71), and the lower-end supporting member (72) is rotatably connected with the top end of the bending part (73).

4. The seat, headrest and lumbar support three-link mechanical extension device according to claim 1, characterized in that: The headrest rotating component (9) includes: A headrest fixing member (91) which is used for connecting with the backrest; A headrest upper driven member (92) and a headrest lower driven member (93) whose one ends are both rotatably arranged on the headrest fixing member (91); A headrest driving member (94), with both ends of the headrest driving member (94) rotatably connected to a back-insert driven member (62) and a headrest lower driven member (93) respectively; A headrest front support member (95), with the headrest front support member (95) rotatably arranged on a headrest upper driven member (92) and the headrest lower driven member (93); A headrest rear support member (96), with the headrest rear support member (96) rotatably arranged on the headrest upper driven member (92), and one end of the headrest front support member (95) and the headrest rear support member (96) away from the headrest upper driven member (92) are both used for rotatably connecting with the headrest.

5. A mechanical stretching device for the three-linkage of a seat, a headrest, and a lumbar support according to claim 4, characterized in that: A fixing column (97) is arranged on the headrest fixing member (91), a fixing groove (931) and a limiting groove (932) are formed on the headrest lower driven member (93), the fixing column (97) presses against the fixing groove (931) and is used for positioning the position of the headrest; a limiting column (623) is arranged on the back-insert driven member (62), and the fixing column (97) and the limiting column (623) are located on both sides of the headrest lower driven member (93); when the sofa is converted to a lying position, the limiting column (623) presses against the limiting groove (932) and cooperates with the fixing column (97) to clamp the headrest lower driven member (93) to position the sofa.

6. The mechanical extension device with three-linkage of seat, headrest and lumbar support according to claim 1, characterized in that: The first follower assembly (41) includes; A first driving plate (42) and a second driving plate (43), with both the first driving plate (42) and the second driving plate (43) rotatably arranged on the iron frame (1) and arranged at intervals; A first follower rod (44), with the first follower rod (44) rotatably arranged on the first driving plate (42); A second follower rod (45), with the second follower rod (45) rotatably arranged on the second driving plate (43); A first follower plate (46), with the first follower plate (46) rotatably arranged on the first follower rod (44) and the second follower rod (45); A connecting follower plate (47), with both ends of the connecting follower plate (47) rotatably connected to the seat frame (11) and the first follower plate (46) respectively and used for avoiding interference when the seat frame (11) moves downward obliquely; A second follower plate (48), with both ends of the second follower plate (48) rotatably connected to the first follower rod (44) and the second follower rod (45) respectively.

7. A mechanical extension device with three-linkage of seat, headrest and lumbar support according to claim 6, characterized in that: The second follower assembly (5) includes: A follower support member (51), with both ends of the follower support member (51) rotatably arranged on the seat frame (11) and the first follower plate (46); A follower driving plate (52), with the follower driving plate (52) arranged on the ottoman assembly (2); A follower connecting plate (53), with both ends of the follower connecting plate (53) rotatably connected to the follower driving plate (52) and the follower support member (51) respectively.

8. A mechanical stretching device with three-linkage of seat, headrest and lumbar support according to claim 1, characterized in that: There are two stretching mechanisms (6) arranged at intervals and are used for connecting with the lumbar support through two connecting components (8), and the connecting component (8) includes: A lumbar support connecting member (81), with the lumbar support connecting member (81) arranged on the back-insert driven member (62); A lumbar support support column (82), with the lumbar support support column (82) arranged on the lumbar support connecting member (81) and used for connecting with the lumbar support.

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