Stretchable framework for furniture and sofa with stretchable framework for furniture

Abstract

The invention discloses a stretching framework for furniture. The stretching framework comprises a base frame, a cushion frame, a backrest mechanism, a footrest mechanism, a cushion frame control assembly, a linkage connecting rod and a backrest control assembly. The backrest mechanism and the footrest mechanism are correspondingly arranged at the rear end and the front end of the seat cushion frame; and the cushion control assembly is arranged between the cushion frame and the base frame. The head end and the tail end of the linkage connecting rod are correspondingly hinged to the foot rest swing rod and the inner connecting rod. The backrest control assembly is hinged to the backrest mechanism, the cushion frame and the base frame. In the process of switching from the retraction position to the extension position, the foot rest mechanism is linked with the seat cushion frame control assembly through the linkage connecting rod, so that the seat cushion frame and the backrest mechanism are switched from the initial position to the preset middle position together; in the process that the backrest mechanism is switched to the ending position from the preset middle position along with the seat cushion frame, the backrest control assembly controls the angle adjustment of the backrest mechanism; the method is stable in operation, free of virtual position feeling and good in user experience in a zero-wall-leaning occasion. In addition, the invention also discloses a sofa.

Description

Technical Field

[0001] The invention relates to a piece of furniture, in particular to an extendable frame for furniture and a sofa with the extendable frame for furniture. Background Art

[0002] With the continuous development of economy and the continuous progress of society, more and more material consumer goods are provided for people's lives, and sofa is one of the many material consumer goods.

[0003] At present, for the floor-standing series sofas with adjustable armrests, an extendable iron frame is installed inside, which includes a footrest device, a seat cushion device and a backrest mechanism. The relative positions and angles of the footrest, seat cushion and backrest of the sofa can be adjusted through a complex multi-stage driving mechanism, so that the sofa can be switched among sitting position, leisure position and full lying position to meet people's usage needs.

[0004] However, the existing sofa extension iron frame has the disadvantages of unstable operation of the cushion device, a sense of empty space and poor user experience, because the linkage between the footrest device and the cushion device is realized by a complex multi-stage driving mechanism. In addition, the sofa with the extension iron frame cannot be used in occasions where there is no wall support.

[0005] Therefore, there is an urgent need for an extendable frame for furniture and a sofa having the extendable frame for furniture to overcome one or more of the above-mentioned defects. Summary of the invention

[0006] One object of the present invention is to provide an extendable frame for furniture that is suitable for use in situations where there is no wall support and that has stable operation, no sense of void, and good user experience.

[0007] Another object of the present invention is to provide a sofa that is stable in operation, has no empty space, and provides good user experience in an environment where there is no need to lean against a wall.

[0008] To achieve the above-mentioned purpose, the extendable frame for furniture of the present invention comprises a base frame, a cushion frame, a backrest mechanism, a footrest mechanism, a cushion frame control component, a linkage rod and a backrest control component driven by the cushion frame to control the angle adjustment of the backrest mechanism. The seat cushion frame can move relative to the base frame in the front and rear directions of the base frame and has at least an initial position, a preset intermediate position and an end position; the backrest mechanism is mounted on the rear end of the seat cushion frame; the footrest mechanism is mounted on the front end of the seat cushion frame and can switch between at least a retracted position and an extended position, and the footrest mechanism has at least one footrest swing rod hinged and pivoted with the seat cushion frame; the seat cushion control assembly is mounted between the seat cushion frame and the base frame to control the seat cushion frame to move forward and backward relative to the base frame, and the seat cushion frame control assembly includes an outer connecting rod assembly that together with the base frame forms an outer multi-link structure, an inner connecting rod assembly that together with the seat cushion frame forms an inner multi-link structure, and a transmission assembly that transmission connects the outer connecting rod assembly and the inner connecting rod assembly, and the inner connecting rod assembly has at least one hinged and pivoted with the seat cushion frame. the inner connecting rod of the swing; the head end of the linkage connecting rod is hinged to the footrest swing rod, the tail end of the linkage connecting rod is hinged to the inner connecting rod, and the backrest control assembly is respectively hinged to the backrest mechanism, the rear end of the seat cushion frame and the rear end of the base frame; wherein, in the process of switching from the retracted position to the extended position, the footrest mechanism links the seat cushion frame control assembly through the linkage connecting rod so that the seat cushion frame and the backrest mechanism are switched from the initial position to the preset middle position together; in the process that the backrest mechanism follows the seat cushion frame to switch from the preset middle position to the terminal position, the backrest control assembly controls the angle adjustment of the backrest mechanism; in the process that the seat cushion frame switches between the initial position and the terminal position, the head end of the linkage connecting rod is always in front of the tail end of the linkage connecting rod.

[0009] Compared with the prior art, with the help of the design that "the tail end of the connecting rod is hinged to the inner connecting rod, and the head end of the connecting rod is hinged to the footrest swing rod", during the process of switching from the retracted position to the extended position, the footrest mechanism can link the seat cushion frame control assembly through the connecting rod to make the seat cushion frame and the backrest mechanism switch from the initial position to the preset middle position; combined with the design that "in the process of switching the seat cushion frame between the initial position and the end position, the head end of the connecting rod is always in front of the tail end of the connecting rod", the connecting rod always maintains a tilted state during the process, without switching between the pulling and pushing states, so that the seat cushion frame runs stably, there is no sense of empty space, and the user experience is good. In addition, in the process of switching from the retracted position to the extended position, the footrest mechanism links the seat cushion frame control assembly to move through the linkage rod, and the moving seat cushion frame control assembly causes the seat cushion frame and the backrest mechanism to switch from the initial position to the preset middle position together; when the seat cushion frame and the backrest mechanism switch to the preset middle position together, the backrest control assembly driven by the seat cushion frame starts to control the angle adjustment of the backrest mechanism; since the angle adjustment of the backrest mechanism is performed when the backrest mechanism switches to the preset middle position relative to the base frame together with the seat cushion frame, a position avoidance is provided for the angle adjustment of the backrest mechanism, so that the extendable frame for furniture of the present invention is suitable for occasions where there is no wall contact.

[0010] To achieve the above-mentioned purpose, the sofa of the present invention comprises a backrest, a seat cushion and the aforementioned furniture extension frame. The backrest is assembled on the backrest mechanism, and the seat cushion is installed on the seat cushion frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a plan view of the sofa of the present invention when it is in a sitting position (CLOSE) and viewed from right to left along the base frame. The figure hides the body guard on the right side, and the footrest is in a retracted position and the cushion frame is in an initial position.

[0012] Figure 2 This is a plan view of the sofa of the present invention when it is in a leisure posture (TV) and viewed from right to left along the base frame. The figure hides the body guard on the right side, and the footrest is in an extended position and the cushion frame is in a preset middle position.

[0013] Figure 3 This is a plan view of the sofa of the present invention when it is in a fully reclining state (RELAX) and viewed from right to left along the base frame. The figure hides the body guard on the right side, and the footrest is in an extended position and the cushion frame is in a terminal position.

[0014] Figure 4 It is a stereoscopic view of the extendable frame for furniture of the present invention when the footrest device is in a retracted position and the cushion frame is in an initial position.

[0015] Figure 5 yes Figure 4A plan view viewed from the direction opposite to that indicated by arrow B.

[0016] Figure 6 yes Figure 5 The plan view after hiding the right-side seat cushion frame, seat cushion frame control assembly, linkage rod, base frame, backrest mechanism, backrest control assembly, telescopic drive and front fixing rod.

[0017] Figure 7 It is a three-dimensional diagram of the extendable frame for furniture of the present invention when the footrest device has not been switched to the extended position and the cushion frame has not been switched to the preset middle position.

[0018] Figure 8 yes Figure 7 A plan view viewed from the direction opposite to that indicated by arrow B.

[0019] Fig. 9 yes Figure 8 The plan view after hiding the right-side seat cushion frame, seat cushion frame control assembly, linkage rod, base frame, backrest mechanism, backrest control assembly, telescopic drive and front fixing rod.

[0020] Fig.10 It is a three-dimensional diagram of the extendable frame for furniture of the present invention when the footrest device is switched to the extended position and the cushion frame is switched to the preset middle position.

[0021] Fig.11 yes Fig.10 A plan view viewed from the direction opposite to that indicated by arrow B.

[0022] Fig.12 yes Fig.11 The plan view after hiding the right-side seat cushion frame, seat cushion frame control assembly, linkage rod, base frame, backrest mechanism, backrest control assembly, telescopic drive and front fixing rod.

[0023] Fig.13 yes Fig.11 A plan view of the seat cushion frame when it is switched toward the end position and is in a certain intermediate position.

[0024] Fig.14 yes Fig.13 The plan view after hiding the right-side seat cushion frame, seat cushion frame control assembly, linkage rod, base frame, backrest mechanism, backrest control assembly, telescopic drive and front fixing rod.

[0025] Fig.15 It is a three-dimensional diagram of the furniture extension frame of the present invention when the cushion frame is switched to the end position.

[0026] Fig.16 yes Fig.15 A plan view viewed from the direction opposite to that indicated by arrow B.

[0027] Fig.17 yes Fig.16 The plan view after hiding the right-side seat cushion frame, seat cushion frame control assembly, linkage rod, base frame, backrest mechanism, backrest control assembly, telescopic drive and front fixing rod.

[0028] Fig.18 yes Fig.15 A three-dimensional diagram of the seat cushion frame, seat cushion frame control assembly, linkage rod, base frame, backrest mechanism and backrest control assembly on the left side of the center.

[0029] Fig.19 yes Fig.18 Exploded three-dimensional diagram.

[0030] Fig. 20 yes Fig.19 Further exploded view. DETAILED DESCRIPTION

[0031] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings.

[0032] See also Figures 1 to 3 The sofa 1000 of the present invention comprises a furniture extension frame 100, a backrest 200 and a seat cushion 300. The backrest 200 is assembled on a backrest mechanism 70 described below, and the seat cushion 300 is mounted on a seat cushion frame 20 described below; so that the sofa 1000 of the present invention can be used in Figure 1 The sitting position shown (CLOSE), Figure 2 The leisure posture shown (TV) and Figure 3 The user can switch between the three states of the full reclining position (RELAX) shown in the figure to better meet the needs of the user. Figures 1 to 3 As an example, the sofa 1000 of the present invention further includes a guard 400, a foot pad 500 mounted on the footrest mechanism 30 described below, and a front baffle 600 arranged at the front lower part of the furniture extension frame 100; the guards 400 are arranged side by side separated from each other on the left and right, and the backrest 200 and the seat cushion 300 are located between the guards 400 on the left and right sides; the front baffle 600 is fixedly connected to the guards 400 on the left and right sides, the furniture extension frame 100 is located between the guards 400 on the left and right sides, and the base frame 10 described below in the furniture extension frame 100 is fixedly connected to the guard 400, and the guard 400 provides an assembly place and a support function for the furniture extension frame 100. It should be noted that although Figures 1 to 3 The sofa 1000 of the present invention further includes a protective body 400, a foot pad 500 mounted on the footrest mechanism 30, and a front baffle 600 arranged at the front lower part of the furniture extension frame 100. Obviously, the front baffle 600 can be deleted according to actual needs, so it is not shown in FIG. Figures 1 to 3 Limits shown.

[0033] Recombination Figure 4 , Figure 7 and Fig.10 The furniture extension frame 100 comprises a base frame 10, a cushion frame 20, a footrest mechanism 30, and a cushion frame control assembly 40 (see Fig.15 and Fig.16 ), the linkage rod 50, the backrest control assembly 60 and the backrest mechanism 70. The seat cushion frame 20 can move relative to the base frame 10 in the front-rear direction of the base frame 10, so that the seat cushion frame 20 has at least an initial position relative to the base frame 10 (see Figures 4 to 6 ), preset middle position (see Figures 10 to 12 ) and end position (see Figures 15 to 17 ).

[0034] The backrest mechanism 70 is mounted on the rear end 21 of the seat cushion frame 20. The rear end 21 of the seat cushion frame 20 provides support and a mounting location for the backrest mechanism 70, and can move forward and backward relative to the base frame 10 along with the seat cushion frame 20. The footrest mechanism 30 is mounted on the front end 22 of the seat cushion frame 20. The footrest mechanism 30 can be at least in the retracted position (see Figure 1 and Figures 4 to 6 shown) and extended position (see Figure 2 and Figures 10 to 12 The footrest mechanism 30 has two footrest swing rods 31 (32) which are hinged and pivoted with the seat cushion frame 20 and arranged one after the other, namely, the front footrest swing rod 31 and the rear footrest swing rod 32. The seat cushion frame control assembly 40 is installed between the seat cushion frame 20 and the base frame 10, and is used to control the forward and backward movement of the seat cushion frame 20 relative to the base frame 10; the seat cushion frame control assembly 40 includes an outer connecting rod assembly 41 which forms an outer four-link structure with the base frame 10, and an inner connecting rod assembly 42 which forms an inner four-link structure with the seat cushion frame 20 (see Fig.10 ) and a transmission assembly 43 (see Fig.15 and Fig.16 ), the inner link assembly 42 has two inner links 421 (423) which are hinged and pivoted with the seat cushion frame 20 and arranged one after the other, namely the front inner link 421 and the rear inner link 423.

[0035] The head end 50a of the connecting rod 50 is hinged to the rear footrest swing rod 32, and the tail end 50b of the connecting rod 50 is hinged to the front inner connecting rod 421, so that the footrest mechanism 30 is linked with the inner connecting rod assembly 42 that controls the movement of the seat cushion frame 20 through the connecting rod 50, and the expansion and contraction of the footrest mechanism 30 is faster than the forward and backward movement of the seat cushion frame 20 relative to the base frame 10; obviously, according to actual needs, the head end 50a of the connecting rod 50 can also be hinged to the front footrest swing rod 31, so it is not limited to the figure shown in the figure.

[0036] The backrest control assembly 60 is hinged to the backrest mechanism 70, the rear end 11 of the base frame 10 and the rear end 21 of the cushion frame 20 respectively. The backrest control assembly 60 is also driven to move by the cushion frame 20, that is, during the movement of the cushion frame 20, the cushion frame 20 also drives the backrest control assembly 60 to move relative to the base frame 10.

[0037] Therefore, in the process of switching from the retracted position to the extended position, the footrest mechanism 30 links the seat cushion frame control assembly 40 through the linkage rod 50, and the moving seat cushion frame control assembly 40 causes the seat cushion frame 20 and the backrest mechanism 70 to move together. Figure 1 The initial position shown is Figure 2 The preset intermediate position shown in FIG. 70 is switched; the backrest mechanism 70 follows the seat cushion frame 20 by Figure 2 The preset intermediate position shown switches to Figure 3 During the process of switching between the initial position and the terminal position, the backrest control assembly 60 controls (links) the backrest mechanism 70 to adjust the angle, so as to achieve the angle adjustment requirement of the backrest 200 assembled on the backrest mechanism 70. In addition, during the process of the seat cushion frame 20 switching between the initial position and the terminal position, the head end 50a of the linkage link 50 is always in front of the tail end 50b of the linkage link 50, so that the linkage link 50 maintains a tilted state, for example, Figure 5 , Figure 8 , Fig.11 and Fig.13 The inclined arrangement shown is front-up and back-down.

[0038] It should be noted that, in the process of switching the sofa 1000 of the present invention from the sitting position (CLOSE) to the fully reclining position (RELAX), when the footrest mechanism 30 switches from the retracted position to the extended position, the seat cushion frame control component 40 is correspondingly linked by the linkage rod 50 to switch the seat cushion frame 20 from the initial position to the preset middle position, so that the sofa 1000 is in the leisure position (TV) at this time; when the sofa 1000 is in the leisure position (TV), when the seat cushion frame 20 continues to switch from the preset middle position to the end position, the backrest control component 60 controls (links) the backrest mechanism 70 to move, so that the backrest 200 follows the backrest mechanism 70 to adjust the angle, thereby achieving the purpose of switching the sofa 1000 from the leisure position (TV) to the fully reclining position (RELAX). More specifically, as follows:

[0039] like Fig.14 As shown, in the left-right direction of the base frame 20, the inner link assembly 42 is located at a first side of the seat cushion frame 20 (eg Fig.14 The footrest mechanism 30 is located at the second side of the seat cushion frame 20 (eg Fig.14At this time, the footrest swing rod 32 hinged to the linkage link 50 passes from the bottom of the seat cushion frame 20 to the first side of the seat cushion frame 20 and extends upward; so as to better meet the need of the linkage link 50 arranged at the first side of the seat cushion frame 20 and the rear footrest swing rod 32 being hinged. Specifically, Figure 5 and Fig.11 As an example, the rear footrest swing rod 32 is provided with a first pivot joint 321 for hingedly connecting to the seat cushion frame 20 and a second pivot joint 324 for hingedly connecting to the connecting rod 50, and the first pivot joint 321 is located above the second pivot joint 324; the front inner connecting rod 421 is provided with a third pivot joint 4213 for hingedly connecting to the seat cushion frame 20 and a fourth pivot joint 4214 for hingedly connecting to the connecting rod 50, and the fourth pivot joint 4214 is located above the third pivot joint 4213, and the third pivot joint 4213 is located in front of the first pivot joint 321; therefore, the connecting rod 50 is more effectively kept in an inclined state during the process of the seat cushion frame 20 switching between the initial position and the terminal position.

[0040] like Fig.12 , Fig.14 , Fig.15 and Figures 17 to 20 As shown in FIG. 1 , as an example, the footrest mechanism 30 further includes a first intermediate link 33 located below the seat cushion frame 20 and extending in the front-rear direction of the base frame 10. The front end of the first intermediate link 33 is hinged to the front footrest swing rod 31, and the rear end of the first intermediate link 33 is hinged to the rear footrest swing rod 32, so that the front footrest swing rod 31, the rear footrest swing rod 32, the first intermediate link 33 and the seat cushion frame 20 together form a four-link structure. Fig.18 In addition, a more detailed description of the footrest mechanism 30 is as follows:

[0041] At Fig.12 , Fig.14 , Fig.15 and Figures 17 to 20 As an example, the footrest mechanism 30 further comprises a front footrest link 34, a rear footrest link 35, a second intermediate link 36, and a first long link 37 and a second long link 38 extending in the front-rear direction of the base frame 10. Optionally, Figure 6 and Fig.14 As an example, the first long link 37 is longer than the second long link 38, and the first long link 37 and the second long link 38 are also arranged side by side in the left and right directions of the seat cushion frame 20, so that the first long link 37 is between the seat cushion frame 20 and the second long link 38. Fig.15The upper end of the rear footrest link 35 is hinged to the rear end 371 of the first long link 37, and the lower end of the rear footrest link 35 is hinged to the rear footrest swing rod 32; the lower end of the front footrest link 34 is hinged to the front footrest swing rod 31, and the upper end of the front footrest link 34 is hinged to the rear end 381 of the second long link 38 and the rear end 371 of the first long link 37 in sequence; the second intermediate link 36 is hinged to both the rear footrest link 35 and the front footrest swing rod 31, as shown in FIG. Fig.17 As shown, the speed at which the second intermediate link 36 and the rear footrest link 35 cooperate to drive the first long link 37 is greater than the speed at which the second long link 38 is driven by the front footrest link 34, thereby satisfying the need to generate a speed difference between the first long link 37 and the second long link 38.

[0042] The front end of the first long connecting rod 37 is hinged with a first footrest head 39a with a supporting portion 391, and the first footrest head 39a is hinged with a second footrest head 39b with a supporting portion 392 at a position away from the first long connecting rod 37, and the second footrest head 39b is hinged with a short rod 39c, and the front end 382 of the second long connecting rod 38 is hinged with the first footrest head 39a and the short rod 39c in sequence. Figure 6 , Fig. 9 , Fig.11 , Fig.12 , Fig.13 , Fig.14 and Fig.17 As an example, the first footrest head 39a is provided with a first hinge structure 393 hinged to the front end 372 of the first long connecting rod 37, a second hinge structure 394 hinged to the front end 382 of the second long connecting rod 38, and a third hinge structure 395 hinged to the second footrest head 39b, the second hinge structure 394 is adjacent to the first hinge structure 393, the front end 382 of the second long connecting rod 38 is provided with a fourth hinge structure 383 located in front of the second hinge structure 394, and the second footrest head 39b is provided with a supporting portion 395 located between the third hinge structure 395 and the second footrest head 39b. 2, the short rod 39c is respectively hinged to the fourth hinge structure 383 and the fifth hinge structure 396. Optionally, as an example, the distance from the second hinge structure 394 to the third hinge structure 395 is D1, the distance from the third hinge structure 395 to the fifth hinge structure 396 is D2, the distance from the fifth hinge structure 396 to the fourth hinge structure 383 is D3, and the distance from the fourth hinge structure 383 to the second hinge structure 394 is D4, wherein D1>D3>D4>D2; the purpose of this design is: when the footrest mechanism 30 switches to Figure 6In the retracted position shown in FIG. 1 , the supporting portion 391 of the first footrest head 39a is arranged forward, and the supporting portion 392 of the second footrest head 39b is arranged downward, so as to meet the need of arranging the supporting portion 391 of the first footrest head 39a and the supporting portion 392 of the second footrest head 39b in a front-to-bottom arrangement, and also avoid the first footrest head 39a and the second footrest head 39b in this position state protruding outward from the seat cushion frame 20. Figure 1 and Figure 6 As shown; when the footrest mechanism 30 is switched to Fig.11 In the extended position shown in FIG. 1 , the supporting portion 391 of the first footrest head 39a and the supporting portion 392 of the second footrest head 39b are arranged upward to meet the user's footrest function needs. Figure 2 and Fig.11 As shown; in addition, by means of D1>D3>D4>D2, the space required for the supporting portion 391 of the first footrest head 39a to switch between the forward position and the upward position is smaller, and the space required for the supporting portion 392 of the second footrest head 39b to switch between the downward position and the upward position is smaller, thereby ensuring that the foot pad 500 respectively assembled on the supporting portion 391 and the supporting portion 392 will not collide with the front block frame 600 during the position switching process.

[0043] like Fig.14 , Fig.16 and Figures 17 to 20 As shown, as an example, the front footrest swing rod 31 is provided with a front swing upper hinge 311, a front swing lower hinge 312, a front swing middle hinge 315 located between the front swing upper hinge 311 and the front swing lower hinge 312, and a lower hinge 313 located beside the front swing lower hinge 312. The lower end of the rear footrest swing rod 32 is provided with a rear swing middle hinge 322 and a rear swing lower hinge 323 in sequence from top to bottom. The seat cushion frame 20 is hinged to the front swing upper hinge 311, and the footrest front connecting rod 34 is hinged to the front swing lower hinge 312; the first intermediate connecting rod 33 is hinged to the front swing middle hinge 315 and the rear swing middle hinge 322 respectively; this design makes the first intermediate connecting rod 33, the footrest front connecting rod 34 and the front footrest swing rod 31 not coaxially hinged, and the first intermediate connecting rod 33, the footrest rear connecting rod 35 and the rear footrest swing rod 32 not coaxially hinged.

[0044] Another example Fig.14 and Figures 17 to 20As shown, as an example, the footrest rear link 35 is provided with a rear intermediate hinge position 354 and a rear upper hinge position 355 hinged to the rear end 371 of the first long link 37, the second intermediate link 36 is hinged to the lower hinge position 313 and the rear intermediate hinge position 354, the rear intermediate hinge position 354 is located between the rear lower hinge position 323 and the rear upper hinge position 355, and it is optional that, as an example, the lower end of the footrest rear link 35 is a rearward bending position bent backward. Structure, the rear middle hinge position 354 of the rear footrest link 35 is located at the bending part of the rear bending structure. Such design better satisfies the requirement that the first long link 37 is driven by the four-bar structure composed of the seat cushion frame 20, the front footrest swing rod 31, the rear footrest swing rod 32 and the first middle link 33 to slide at a speed greater than the speed at which the second long link 38 is driven by the four-bar structure, thereby satisfying the purpose that the first long link 37 can slide relative to the second long link 38.

[0045] For example Fig.14 and Figures 17 to 20 As shown, as an example, the front footrest link 34 is further provided with a front middle hinge position 343 and a front upper hinge position 344, the rear end 382 of the second long link 38 is hinged to the front middle hinge position 343 of the front footrest link 34, and the first long link 37 is hinged to the front upper hinge position 344 of the front footrest link 34. Optionally, as an example, the upper end of the front footrest link 34 is a front bending structure that is bent backwards, and the front middle hinge position 343 of the front footrest link 34 is hinged to the front middle hinge position 343 of the front footrest link 34. Located at the bending part of the front bending structure, such a design can meet the need for compact fit between the first long link 37 and the second long link 38, and can also more reliably meet the need for the first long link 37 to slide relative to the second long link 38 along the front and rear direction of the seat cushion frame 20 during the switching of the footrest mechanism 30 between the extended position and the retracted position, thereby meeting the need for the first long link 37 to drive the supporting portion 391 of the first footrest head 39a to flip between forward and upward.

[0046] Combination Figure 6 , Fig. 9 and Fig.12 , the working principle of the footrest mechanism 30 is explained: when the footrest mechanism 30 is to be Figure 6 The footrest mechanism 30 in the retracted position shown is switched to Fig.12When in the extended position shown, the front footrest swing rod 31 and the rear footrest swing rod 32 are pivoted counterclockwise upward around the front upper hinge 311 and the rear footrest swing rod 32 are pivoted counterclockwise upward around the rear first pivot hinge 321, thereby driving the first intermediate link 33 to move, while also driving the front footrest link 34 to swing clockwise forward around the front lower hinge 312, driving the rear footrest link 35 to swing clockwise forward around the rear lower hinge 323, and driving the second intermediate link 36 to rotate clockwise forward, thereby driving the first long link 37 and the second long link 38 to slide forward, and making the sliding speed of the first long link 37 greater than the speed of the second long link 38; because the first long link 37 and the second long link 38 slide forward, the first footrest head 39a, the second footrest head 39b and the short rod 39c rotate counterclockwise upward. When the front footrest swing rod 31 swings around the front upper hinge position 311 and the rear footrest swing rod 32 swings around the first pivot position 321 counterclockwise upward to Fig.12 When the position shown in FIG. 1 is reached, the supporting portion 391 of the first footrest 39a and the supporting portion 392 of the second footrest 39b are just switched to the upwardly arranged position. Fig.12 It should be noted that Fig. 9 The footrest mechanism 30 is an intermediate position when switching from the retracted position to the extended position. In addition, since the process of switching from the retracted position to the extended position of the footrest mechanism 30 is just opposite to the process from the extended position to the retracted position, it will not be described in detail here. Among them, in the above-mentioned footrest mechanism 30, it can reduce the space occupied in the vertical direction of the seat cushion frame 20.

[0047] like Figures 17 to 20 As shown, as an example, the inner link assembly 42 also has an inner intermediate link 422, which extends along the front-to-back direction of the base frame 10 and is arranged below the seat cushion frame 20, and the inner intermediate link 422 is hinged to the front inner link 421 and the rear inner link 422 respectively; this design enables the front inner link 421 to realize the forward movement of the seat cushion frame 20 by pulling the inner intermediate link 422 and the rear inner link 423.

[0048] Another example Figures 17 to 20As shown, as an example, the outer link assembly 41 includes an outer front link 411, an outer middle link 412 and an outer rear link 413, the outer middle link 412 extends along the front-to-rear direction of the base frame 10 and is located above the base frame 10, and the outer front link 411 and the outer rear link 413 are respectively hinged to both the base frame 10 and the outer middle link 412. The transmission assembly 43 includes a front transmission rod 431, an intermediate transmission rod 432 and a rear transmission rod 433. The front transmission rod 431 is hinged to both the inner intermediate link 422 and the outer front link 411, the rear transmission rod 433 is hinged to both the outer rear link 413 and the inner intermediate link 422, and the intermediate transmission rod 432 is hinged to both the middle of the outer intermediate link 412 and the rear transmission rod 433. Therefore, the inner link assembly 42 that forms an inner four-link structure together with the cushion frame 20 and the outer link assembly 41 that forms an outer four-link structure together with the base frame 10 are linked by the front transmission rod 431, the intermediate transmission rod 432 and the rear transmission rod 433, thereby ensuring that the inner link assembly 42 and the outer link assembly 41 move sequentially. Specifically, at Fig.19 and Fig. 20 As an example, the outer front link 411 is provided with a hinge position 4111 for hinged connection with the front transmission rod 431; the outer intermediate link 412 is provided with a hinge position 4121 for hinged connection with the intermediate transmission rod 432, and the outer rear link 413 is provided with a hinge position 4131 for hinged connection with the rear transmission rod 433. Fig.19 and Fig. 20 shown.

[0049] like Figures 4 to 20 As shown in FIG. 1 , as an example, the backrest mechanism 70 includes a backrest rear swing rod 71, a backrest front swing rod 72, and a backrest rotating frame 73 for assembling the backrest 200 to rotate and adjust the angle of the backrest 200. The backrest rear swing rod 71 is provided with a first hinge position 711 hinged to the rear end 21 of the seat cushion frame 20, a second hinge position 712 hinged to the backrest rotating frame 73, and a third hinge position 713 hinged to the rear end of the third control link 63 described below. The third hinge position 713 is arranged below the second hinge position 712. Figures 5 and 6As shown; the backrest front swing rod 72 is provided with a fourth hinge position 721 hinged to the rear end 21 of the cushion frame 20 and a fifth hinge position 722 hinged to the backrest rotating frame 73, the fifth hinge position 722 is arranged above the fourth hinge position 721, the fifth hinge position 722 is also arranged in front of the second hinge position 712, and the fourth hinge position 721 is arranged in front of the first hinge position 711. Optionally, as an example, the distance from the second hinge position 712 to the first hinge position 711 is P5, the distance from the fourth hinge position 721 to the fifth hinge position 722 is P6, the distance from the first hinge position 711 to the fourth hinge position 721 is P7, and the distance from the second hinge position 712 to the fifth hinge position 722 is P8, wherein P7>P5>P6>P8. This design allows the seat cushion frame 20, the backrest rear swing rod 71, the backrest front swing rod 72 and the backrest rotating frame 73 to jointly form a trapezoidal four-bar structure, so that the backrest rotating frame 73 can rotate and adjust a larger angle driven by the backrest rear swing rod 71.

[0050] like Figure 4 , Figure 5 , Figure 7 , Figure 8 , Fig.10 , Fig.11 , Fig.13 , Fig.15 and Fig.16 As shown, as an example, the backrest control assembly 60 includes a first control link 61, a second control link 62 and a third control link 63. The lower end of the first control link 61 is hinged to the rear end 11 of the base frame 10 to form a first hinge center line C1, the upper end of the first control link 61 is hinged to the lower end of the second control link 62 to form a second hinge center line C2, the upper end of the second control link 62 is hinged to the head end of the third control link 63 to form a third hinge center line C3, the second control link 62 is also hinged to the rear end 21 of the seat cushion frame 20 at a position between its upper and lower ends to form a fourth hinge center line C4, and the tail end of the third control link 63 is hinged to the backrest mechanism 60 (specifically the third hinge position 713). The purpose of this design is to ensure that the backrest control assembly 60 moves forward relative to the base frame 10 to a position such as the third hinge position 713 when the seat cushion frame 20 together with the backrest mechanism 70 moves forward relative to the base frame 10. Fig.11 When the backrest is in the preset middle position, the backrest rear swing rod 71 is linked to perform a pivoting action. Figures 1 to 3 It is known that the backrest 200 mounted on the backrest rotating frame 73 is rotated and adjusted relative to the seat cushion 300 mounted on the seat cushion frame 20 almost around the same axis during the adjustment process, so the user's clothes will not be stretched. Specifically, as follows:

[0051] At Figure 5As an example, the distance from the first hinge center line C1 to the second hinge center line C2 is P1, the distance from the second hinge center line C2 to the fourth hinge center line C4 is P2, the distance from the fourth hinge center line C4 to the third hinge center line C3 is P3, and the distance from the third hinge center line C3 to the third hinge position 713 is P4. Optionally, P2>P1>P7>P5>P6>P8>P3>P4 are arranged to effectively ensure that the backrest control assembly 60 starts to control the backrest mechanism 70 for angle adjustment only when the backrest mechanism 70 follows the seat cushion frame 20 to switch from the initial position to the preset middle position.

[0052] In addition, Figure 5 , Figure 8 and Fig.11 As an example, the backrest control assembly 60 further includes a second control swing rod 64 located behind the first control swing rod 61 and an intermediate control link 65 extending in the front-rear direction of the base frame 10. The lower end of the second control swing rod 64 is hinged to the rear end 11 of the base frame 10 to form a fifth hinge center line C5, the upper end of the second control swing rod 64 is hinged to the intermediate control link 65 to form a sixth hinge center line C6, and the intermediate control link 64 is hinged to the upper end of the first control swing rod 61 to form a seventh hinge center line C7 located behind the second hinge center line C2; ​​and the intermediate control link 65 is connected to a rear fixing rod 90b extending in the left-right direction of the base frame 10 at a position located behind the sixth hinge center line C6. Therefore, with the help of the four-bar linkage composed of the first control rocker arm 61, the second control rocker arm 64, the intermediate control link 64 and the base frame 10, the rear distance of the rear fixing rod 90b relative to the rear end 11 of the base frame 10 can be shortened to accommodate more sofa 1000 shapes; in addition, the minimum installation distance of the telescopic drive 80 described below can also be reduced, so that the stroke of the telescopic drive 80 becomes shorter, so when the speed of the telescopic drive 80 is limited, the speed of opening the furniture extension frame 100 becomes faster.

[0053] like Figure 4 , Figure 7 , Fig.10 and Fig.15 As shown in FIG. 1 , as an example, the furniture extension frame 100 further includes a telescopic driver 80 and a spring 90a. The telescopic driver 80 includes a driver body 81 and a telescopic body 82 that telescopes and slides on the driver body 81. At this time, a front fixed rod 90c extending in the left and right direction of the base frame 10 is fixed to the front footrest swing rod 31. Figure 4 , Figure 7 , Fig.10 and Fig.15 Obviously, according to actual needs, the front fixing rod 90c can also be fixed on the rear footrest swing rod 32, so it is not necessary to Figure 4 , Figure 7 , Fig.10 and Fig.15 The driver body 81 is hinged to the rear fixed rod 90b, and the telescopic body 82 is hinged to the front fixed rod 90c. Obviously, according to actual needs, the driver body 81 can also be hinged to the front fixed rod 90c and the telescopic body 82 can be hinged to the rear fixed rod 90b. Figure 4 , Figure 7 , Fig.10 and Fig.15 The figure is limited. The spring 90a is connected to both the rear fixed rod 90b and the inner connecting rod assembly 42 (specifically, the inner middle connecting rod 422); with the help of the cooperation between the spring 90a and the telescopic driver 80, the spring 90a is in a contracted state during the opening process of the footrest mechanism 30. Relatively speaking, the spring 90a provides assistance to the telescopic driver 80, so that the telescopic driver 80 can easily open the footrest mechanism 30 with less force; in addition, through the cooperation between the spring 90a and the telescopic driver 80, the number of telescopic drivers 80 used is reduced. It should be noted that the telescopic driver 80 can be, for example, but not limited to, an electric push rod; in addition, Figure 4 , Figure 7 , Fig. 9 , Fig.10 , Fig.12 and Fig.15 As an example, the rear end of the inner intermediate link 422 is provided with a column 4221 for assembly connection with the front end of the spring 90a.

[0054] For example Figure 4 , Figure 7 , Fig.10 and Fig.15 As shown, as an example, the base frame 10, the cushion frame 20, the backrest mechanism 70, the backrest control assembly 60, the footrest mechanism 30, the linkage rod 50 and the cushion frame control assembly 40 are arranged in a left and right correspondence in the left and right directions of the base frame 10, the left and right ends of the rear fixed rod 90b are respectively fixedly connected to the middle control link 65 at the same end, and the left and right ends of the front fixed rod 90c are respectively fixedly connected to the front footrest swing rod 31 at the same end, specifically, fixedly connected to the fixed connection position 314 set on the front footrest swing rod 31. Since the front fixed rod 90c is fixedly connected to the front footrest swing rod 31, it makes it easier for the telescopic driver 80 to drive the footrest mechanism 30 to open.

[0055] In conjunction with the accompanying drawings, the process of adjusting the sofa 1000 of the present invention from the sitting state (CLOSE) to the full reclining state (RELAX) is described: when it is necessary Figure 1 The sofa 1000 in the sitting position (CLOSE) shown is adjusted to Figure 2In the leisure posture state (TV) shown in FIG. 1 , the telescopic actuator 80 is in operation, and the working telescopic actuator 80 drives the footrest mechanism 30 to stretch forward, and the stretched footrest mechanism 30 links the seat cushion frame 20 to move forward relative to the base frame 10 through the linkage rod 50 and the seat cushion frame control assembly 40; because the backrest control assembly 60 is respectively hinged to the rear end 11 of the base frame 10, the rear end 21 of the seat cushion frame 20 and the backrest mechanism 70, and is combined with the backrest control assembly 60, the backrest control assembly 60 is respectively hinged to the rear end 11 of the base frame 10, the rear end 21 of the seat cushion frame 20 and the backrest mechanism 70, and ... Figure 5 and Figure 8 The forward movement of the cushion frame 20 causes the third control link 63, the middle control link 65, the second control swing rod 64 and the first control swing rod 61 to pivot downward clockwise, and also causes the second control link 62 to pivot downward counterclockwise; and the spring 90a is in a contracted state during the opening process of the footrest mechanism 30, providing assistance to the telescopic drive 80, so that the telescopic drive 80 can easily open the footrest mechanism 30 with less force.

[0056] When the telescopic driver 80 drives the footrest mechanism 30 to stretch forward until it is fully in place, Figure 2 In the state shown, at this time, the telescopic body 82 of the telescopic driver 80 continues to extend forward, so that the seat cushion frame 20 together with the backrest mechanism 70 continues to move forward, and under the control of the backrest control assembly 60, combined with Fig.11 , Fig.13 and Fig.16 , so that the third control link 63, the middle control link 65, the second control swing rod 64 and the first control swing rod 61 are pivoted clockwise downward, and the second control link 62 is pivoted counterclockwise downward, thereby achieving the purpose of adjusting the angle of the backrest rotating frame 73. Figure 3 and Fig.16 In the process of the seat cushion frame 20 switching from the preset middle position to the end position, the spring 90a is in a stretched state.

[0057] In addition, when the seat cushion frame 20 and the backrest mechanism 70 switch from the initial position to the preset middle position, the seat cushion frame 20 moves forward slower than the extension of the footrest mechanism 30, so that the seat cushion frame 20 changes less relative to the base frame 10, so that the sofa 1000 is in a better TV state.

[0058] Compared with the prior art, by means of the design that "the rear end 50b of the connecting link 50 is hinged to the front inner link 421, and the front end 50a of the connecting link 50 is hinged to the rear footrest swing rod 32", during the process of switching from the retracted position to the extended position, the footrest mechanism 30 can link the seat cushion frame control assembly 40 through the connecting link 50 to switch the seat cushion frame 20 and the backrest mechanism 70 from the initial position to the preset middle position; combined with the design that "in the process of switching the seat cushion frame 20 between the initial position and the terminal position, the front end 50a of the connecting link 50 is always in front of the rear end 50b of the connecting link 50", the connecting link 50 always maintains a tilted state during the process, without switching between the pulling and pushing states (i.e., the pulling state and the pushing state), so that the seat cushion frame 20 runs stably, has no sense of empty space, and has a good user experience. In addition, in the process of switching from the retracted position to the extended position, the footrest mechanism 30 links the seat cushion frame control assembly 40 to move through the linkage rod 50, and the moving seat cushion frame control assembly 40 causes the seat cushion frame 20 and the backrest mechanism 70 to switch from the initial position to the preset middle position together; when the seat cushion frame 20 and the backrest mechanism 70 switch to the preset middle position together, the backrest control assembly 60 driven by the seat cushion frame 20 starts to control the angle adjustment of the backrest mechanism 70; since the angle adjustment of the backrest mechanism 70 is performed when the backrest mechanism 70 follows the seat cushion frame 20 and switches to the preset middle position relative to the base frame 10, a position avoidance is provided for the angle adjustment of the backrest mechanism 70, so that the sofa 1000 including the furniture extension frame 100 can be adapted to occasions where there is no wall contact.

[0059] It should be noted that the zero wall-to-wall relationship here means that the backrest 200 of the sofa 1000 can be attached to the wall, and the distance between them is zero; for example, Figures 1 to 3 In the figure, the vertical center line indicates the position of the wall. When the sofa 1000 is in the sitting state (CLOSE), the distance between the backrest 200 of the sofa 1000 and the vertical center line is zero. In the process of the sofa 1000 switching from the sitting state (CLOSE) to the leisure state (TV) and the full lying state (RELAX), the distance between the backrest 200 and the vertical center line becomes larger and larger, so the adjustment of the backrest 200 will not cause collision interference with the vertical center line.

[0060] It is worth noting that the direction indicated by arrow A in the drawings is the direction from back to front of the base frame 10, the direction indicated by arrow B in the drawings is the direction from left to right of the base frame 10, and the direction indicated by arrow C in the drawings is the direction from bottom to top of the base frame 10. Figure 5 , Figure 8 , Fig.11 and Fig.13It is known that under the control of the cushion frame control assembly 40, the cushion frame 20 also changes a certain angle relative to the base frame 10 during the forward movement, so that the forward and backward movement of the cushion frame 20 is swinging. In addition, although the aforementioned inner connecting rod assembly 42 and the cushion frame 20 together form an inner four-link structure, it is obvious that an inner five-link structure can also be formed according to actual needs; similarly, the outer connecting rod assembly 41 that forms an outer four-link structure together with the base frame 10 can also form an outer five-link structure together with the base frame 10 according to actual needs; therefore, it is not limited to the drawings shown in the drawings.

[0061] The above disclosure is only a preferred embodiment of the present invention, which is to facilitate the understanding and implementation of the present invention by those skilled in the art. It certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention still fall within the scope covered by the present invention.

Claims

1. An extendable frame for furniture, comprising a base frame, a cushion frame, a backrest mechanism, a footrest mechanism and a cushion frame control assembly, wherein the cushion frame can move relative to the base frame in the front-to-back direction of the base frame and has at least an initial position, a preset intermediate position and a terminal position, the backrest mechanism is mounted on the rear end of the cushion frame, the footrest mechanism is mounted on the front end of the cushion frame and can be switched between at least a retracted position and an extended position, the footrest mechanism has at least one footrest swing rod hinged and pivoted to the cushion frame, the cushion control assembly is mounted between the cushion frame and the base frame to control the front-to-back movement of the cushion frame relative to the base frame, and is characterized in that: The furniture extension frame also includes a connecting rod and a backrest control component that is driven by the seat cushion frame to control the angle adjustment of the backrest mechanism. The seat cushion frame control component includes an outer connecting rod component that together with the base frame forms an outer multi-link structure, an inner connecting rod component that together with the seat cushion frame forms an inner multi-link structure, and a transmission component that connects the outer connecting rod component and the inner connecting rod component in a transmission manner. The inner connecting rod component has at least one inner connecting rod that is hinged and pivoted with the seat cushion frame. The head end of the connecting rod is hinged with the footrest swing rod, and the tail end of the connecting rod is hinged with the inner connecting rod. The backrest control component is respectively connected to the backrest mechanism, The rear end of the seat cushion frame and the rear end of the base frame are hinged; wherein, during the process of switching from the retracted position to the extended position, the footrest mechanism links the seat cushion frame control component through the linkage rod to make the seat cushion frame and the backrest mechanism switch from the initial position to the preset middle position together; when the backrest mechanism follows the seat cushion frame to switch from the preset middle position to the terminal position, the backrest control component controls the angle adjustment of the backrest mechanism; when the seat cushion frame switches between the initial position and the terminal position, the head end of the linkage rod is always in front of the tail end of the linkage rod.

2. The furniture extension frame according to claim 1, characterized in that: In the left and right directions of the base frame, the inner link assembly is located at a first side of the seat cushion frame, the footrest mechanism is located at a second side opposite to the seat cushion frame, and the footrest swing arm hinged to the linkage link extends from the bottom of the seat cushion frame to the first side of the seat cushion frame and extends upward.

3. The furniture extension frame according to claim 2, characterized in that: In the footrest swing arm hinged to the connecting rod, the footrest swing arm is provided with a first pivot position for hinged and pivoted with the seat cushion frame and a second pivot position for hinged with the connecting rod, and the first pivot position is above the second pivot position; in the inner connecting rod hinged to the connecting rod, the inner connecting rod is provided with a third pivot position for hinged with the seat cushion frame and a fourth pivot position for hinged with the connecting rod, and the fourth pivot position is above the third pivot position; the third pivot position is in front of the first pivot position.

4. The furniture extension frame according to claim 1, characterized in that: The inner link assembly also has an inner middle link, which extends along the front-to-rear direction of the base frame and is arranged below the seat cushion frame; the inner links are two, arranged one in front and one in the back, and the inner middle link is hinged to the front and rear inner links respectively; the tail end of the connecting link is hinged to the front inner link; the outer multi-link structure is a four-link structure.

5. The furniture extension frame according to claim 1, characterized in that: The footrest mechanism also has a first intermediate connecting rod located below the seat cushion frame and extending in the front-rear direction of the base frame. The two footrest rocker rods are arranged one in front and one in the rear. The front end of the first intermediate connecting rod is hinged to the front footrest rocker rod, and the rear end of the first intermediate connecting rod is hinged to the rear footrest rocker rod; the head end of the linkage connecting rod is hinged to the rear footrest rocker rod.

6. The furniture extension frame according to claim 5, characterized in that: The footrest mechanism also comprises a front footrest link, a rear footrest link, a second intermediate link, and a first long link and a second long link extending in the front-rear direction of the base frame; the upper end of the rear footrest link is hinged to the rear end of the first long link, and the lower end of the rear footrest link is hinged to the rear footrest swing rod; the lower end of the front footrest link is hinged to the front footrest swing rod, and the upper end of the front footrest link is hinged to the rear end of the second long link and the rear end of the first long link in sequence; the second intermediate link is hinged to both the rear footrest link and the front footrest swing rod; the front end of the first long link is hinged to a first footrest with a supporting portion A footrest, a second footrest with a supporting portion is hingedly connected to the first footrest and the first long connecting rod at a position away from the first long connecting rod, and the second footrest is hingedly connected to a short rod; the front end of the second long connecting rod is hingedly connected to the first footrest and the short rod in sequence; when the footrest mechanism is switched to the retracted position, the supporting portions of the first footrest and the second footrest are arranged one in front and one below, and the first long connecting rod and the second long connecting rod slide and retract into the cushion frame; when the footrest mechanism is switched to the extended position, the supporting portions of the first footrest and the second footrest are arranged upwards, and the first long connecting rod and the second long connecting rod slide and extend out of the cushion frame.

7. The furniture extension frame according to claim 6, characterized in that: The front footrest swing rod is provided with a front swing upper hinge position, a front swing lower hinge position, a front swing middle hinge position located between the front swing upper hinge position and the front swing lower hinge position, and a lower hinge position located on the side of the front swing lower hinge position; the seat cushion frame is hinged to the front swing upper hinge position, the footrest front connecting rod is hinged to the front swing lower hinge position, and the first middle connecting rod is hinged to the front swing middle hinge position; the lower end of the rear footrest swing rod is provided with a rear swing middle hinge position and a rear swing lower hinge position in sequence from top to bottom; the footrest rear connecting rod is hinged to the rear swing lower hinge position, and the first middle connecting rod is hinged to the front swing middle hinge position. An intermediate link is hinged to the rear swing intermediate hinge; the footrest rear link is provided with a rear connection intermediate hinge and a rear connection upper hinge hinged to the rear end of the first long link; the second intermediate link is respectively hinged to the lower hinge and the rear connection intermediate hinge, and the rear connection intermediate hinge is located between the rear swing lower hinge and the rear connection upper hinge; the footrest front link is also provided with a front connection intermediate hinge and a front connection upper hinge, the rear end of the second long link is hinged to the front connection intermediate hinge, and the first long link is hinged to the front connection upper hinge.

8. The furniture extension frame according to claim 1, characterized in that: The backrest control assembly includes a first control rocker arm, a second control link and a third control link. The lower end of the first control rocker arm is hinged to the rear end of the base frame to form a first hinge center line, the upper end of the first control rocker arm is hinged to the lower end of the second control link to form a second hinge center line, the upper end of the second control link is hinged to the head end of the third control link to form a third hinge center line, the second control link is also hinged to the rear end of the seat cushion frame at a position between its upper and lower ends to form a fourth hinge center line, and the tail end of the third control link is hinged to the backrest mechanism.

9. The furniture extension frame according to claim 8, characterized in that: The backrest control assembly also includes a telescopic driver and a spring, wherein the telescopic driver includes a driver body and a telescopic body that telescopes and slides on the driver body; the backrest control assembly also includes a second control swing rod located behind the first control swing rod and an intermediate control link extending in the front-rear direction of the base frame, the lower end of the second control swing rod is hinged to the rear end of the base frame to form a fifth hinge center line, the upper end of the second control swing rod is hinged to the intermediate control link to form a sixth hinge center line, the intermediate control link is hinged to the upper end of the first control swing rod to form a seventh hinge center line located behind the second hinge center line, and the intermediate control link is connected to a rear fixed rod extending in the left-right direction of the base frame at a position behind the sixth hinge center line, and a front fixed rod extending in the left-right direction of the base frame is fixed to the footrest swing rod; one of the driver body and the telescopic body is hinged to the rear fixed rod, and the other end of the driver body and the telescopic body is hinged to the front fixed rod; the spring is connected to both the rear fixed rod and the inner link assembly.

10. The furniture extension frame according to claim 8, characterized in that: The backrest mechanism includes a backrest rear swing rod, a backrest front swing rod and a backrest rotating frame for the backrest assembly to rotate and adjust the backrest angle, the backrest rear swing rod is provided with a first hinge position hinged to the rear end of the seat cushion frame, a second hinge position hinged to the backrest rotating frame and a third hinge position hinged to the tail end of the third control link, the third hinge position is arranged below the second hinge position, the backrest front swing rod is provided with a fourth hinge position hinged to the rear end of the seat cushion frame and a fifth hinge position hinged to the backrest rotating frame, the fifth hinge position is arranged above the fourth hinge position, and the fifth hinge position is also arranged in front of the second hinge position. The fourth articulation position is arranged in front of the first articulation position; the distance from the first articulation centerline to the second articulation centerline is P1, the distance from the second articulation centerline to the fourth articulation centerline is P2, the distance from the fourth articulation centerline to the third articulation centerline is P3, the distance from the third articulation centerline to the third articulation position is P4, the distance from the second articulation position to the first articulation position is P5, the distance from the fourth articulation position to the fifth articulation position is P6, the distance from the first articulation position to the fourth articulation position is P7, and the distance from the second articulation position to the fifth articulation position is P8; wherein, P2>P1>P7>P5>P6>P8>P3>P4.

11. A sofa, comprising a backrest and a seat cushion, characterized in that: The sofa further comprises an extendable frame for furniture according to any one of claims 1 to 10, the backrest is assembled on the backrest adjustment mechanism, and the seat cushion is mounted on the seat cushion frame.

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