Stretching frame for furniture and sofa having the same

Abstract

The present invention discloses an extendable skeleton for furniture, which includes a base frame, a seat cushion frame, a backrest mechanism, a footrest mechanism, a seat cushion frame control component, a linkage connecting rod and a backrest control component. The backrest mechanism and the footrest mechanism are respectively installed at the rear end and the front end of the seat cushion frame; the seat cushion control component is installed between the seat cushion frame and the base frame. The head end and the tail end of the linkage connecting rod are respectively hinged to the footrest swing rod and the inner connecting rod. The backrest control component is respectively hinged to the backrest mechanism, the seat cushion frame and the base frame; during the process of switching from the retracted position to the extended position, the footrest mechanism drives the seat cushion frame control component through the linkage connecting rod to cause the seat cushion frame and the backrest mechanism to switch from the initial position to the preset intermediate position together; during the process of the backrest mechanism following the seat cushion frame to switch from the preset intermediate position to the termination position, the backrest control component controls the angle adjustment of the backrest mechanism; so as to operate stably, have no sense of play and provide a good user experience in the occasion suitable for zero-wall leaning. In addition, the present invention also discloses a sofa.

Description

Technical Field

[0001] The present invention relates to a piece of furniture, and more particularly to an extendable frame for furniture and a sofa having the extendable frame for furniture. Background Art

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

[0003] Currently, for adjustable armrest floor series sofas, an extendable iron frame is installed inside, and the extendable iron frame 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 drive mechanism among the three, so as to realize the switching of the sofa among sitting postures, leisure postures, and full reclining postures to meet people's usage needs.

[0004] However, for the extendable iron frame in the existing sofas, since the linkage between the footrest device and the seat cushion device is realized by a complex multi-stage drive mechanism, there are defects such as unstable operation of the seat cushion device, a sense of play, and poor user experience. In addition, the sofa having this extendable iron frame cannot be adapted to the zero-wall-adjacent occasion.

[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 defects. Summary of the Invention

[0006] An object of the present invention is to provide an extendable frame for furniture that operates stably, has no sense of play, and has a good user experience when applicable to the zero-wall-adjacent occasion.

[0007] Another object of the present invention is to provide a sofa that operates stably, has no sense of play, and has a good user experience when applicable to the zero-wall-adjacent occasion.

[0008] To achieve the above-mentioned purpose, the furniture extension frame of the present invention includes a base frame, a seat cushion frame, a backrest mechanism, a footrest mechanism, a seat cushion frame control component, a connecting rod and a backrest control component driven by the seat cushion frame to control the angle adjustment of the backrest mechanism. The seat cushion frame can be moved 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 assembled at the rear end of the seat cushion frame; the footrest mechanism is assembled at the front end of the seat cushion frame and can switch at least between 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 assembled 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 link assembly that together with the base frame forms an outer multi-link structure, an inner link assembly that together with the seat cushion frame forms an inner multi-link structure, and a transmission assembly that transmission connects the outer link assembly and the inner link assembly, and the inner link 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 hinged to the backrest mechanism, the rear end of the seat cushion frame and the rear end of the base frame respectively; 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 of the backrest mechanism following the seat cushion frame to switch from the preset middle position to the end position, the backrest control assembly controls the angle adjustment of the backrest mechanism; in the process of the seat cushion frame switching between the initial position and the end 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 existing technology, with the help of the design of "the tail end of the connecting rod is hinged to the inner rod, and the head end of the connecting rod is hinged to the footrest rocker 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 of "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 is always kept in an inclined state during the process, without switching between pull and push 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 to move 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 extension frame of the furniture of the present invention is suitable for occasions where there is no wall support.

[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 seat 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 seat 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 seat cushion frame is in an end position.

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

[0015] Figure 5 yes Figure 4Plan view seen in the direction opposite to that indicated by arrow B.

[0016] Figure 6 is Figure 5 Plan view after hiding the seat cushion frame, seat cushion frame control component, linkage rod, base frame, backrest mechanism, backrest control component, telescopic driver and front fixing rod on the right side.

[0017] Figure 7 Is a perspective view of the extensible frame for furniture of the present invention when the footrest device is not switched to the extended position and the seat cushion frame is not switched to the preset intermediate position.

[0018] Figure 8 is Figure 7 Plan view seen in the direction opposite to that indicated by arrow B.

[0019] Figure 9 is Figure 8 Plan view after hiding the seat cushion frame, seat cushion frame control component, linkage rod, base frame, backrest mechanism, backrest control component, telescopic driver and front fixing rod on the right side.

[0020] Figure 10 Is a perspective view of the extensible frame for furniture of the present invention when the footrest device is switched to the extended position and the seat cushion frame is switched to the preset intermediate position.

[0021] Figure 11 is Figure 10 Plan view seen in the direction opposite to that indicated by arrow B.

[0022] Figure 12 is Figure 11 Plan view after hiding the seat cushion frame, seat cushion frame control component, linkage rod, base frame, backrest mechanism, backrest control component, telescopic driver and front fixing rod on the right side.

[0023] Figure 13 is Figure 11 Plan view when the seat cushion frame is switched to a certain intermediate position in the direction towards the end position.

[0024] Figure 14 is Figure 13 Plan view after hiding the seat cushion frame, seat cushion frame control component, linkage rod, base frame, backrest mechanism, backrest control component, telescopic driver and front fixing rod on the right side.

[0025] Figure 15 Is a perspective view of the extensible frame for furniture of the present invention when the seat cushion frame is switched to the end position.

[0026] Figure 16 is Figure 15 Plan view seen in the direction opposite to that indicated by arrow B.

[0027] Figure 17 Yes Figure 16 It is a plan view after hiding the seat cushion frame on the right side, the seat cushion frame control component, the linkage rod, the base frame, the backrest mechanism, the backrest control component, the telescopic driver, and the front fixing rod.

[0028] Figure 18 Yes Figure 15 It is a perspective view of the seat cushion frame, the seat cushion frame control component, the linkage rod, the base frame, the backrest mechanism, and the backrest control component on the left side in the middle.

[0029] Figure 19 Yes Figure 18 It is a perspective exploded view.

[0030] Figure 20 Yes Figure 19 It is a further perspective exploded view. Specific embodiments

[0031] The following describes the preferred embodiments of the present invention in conjunction with the accompanying drawings of the specification.

[0032] Please refer to Figures 1 to 3 , the sofa 1000 of the present invention includes a furniture extension skeleton 100, a backrest 200, and a seat cushion 300. The backrest 200 is assembled to the backrest mechanism 70 described below, and the seat cushion 300 is installed on the seat cushion frame 20 described below; so that the sofa 1000 of the present invention can be in Figure 1 the sitting posture state (CLOSE) shown in Figure 2 the leisure posture state (TV) shown in Figure 3 the full reclining posture state (RELAX) shown in Figures 1 to 3 switch among the three, so as to better meet the needs of users. Specifically, in Figures 1 to 3 , as an example, the sofa 1000 of the present invention further includes a body protector 400, a footrest pad 500 assembled on the footrest mechanism 30 described below, and a front guard 600 arranged in front of and below the furniture extension skeleton 100; the body protectors 400 are arranged side by side in a separated left and right manner, and both the backrest 200 and the seat cushion 300 are located between the left body protector 400 and the right body protector 400; the front guard 600 is fixedly connected to the left and right body protectors 400, the furniture extension skeleton 100 is located between the left and right body protectors 400, and the base frame 10 described below in the furniture extension skeleton 100 is fixedly connected to the body protector 400, and the body protector 400 provides an assembly place and a supporting function for the furniture extension skeleton 100. It should be noted that although Figures 1 to 3 shows that the sofa 1000 of the present invention further includes a body protector 400, a footrest pad 500 assembled on the footrest mechanism 30, and a front guard 600 arranged in front of and below the furniture extension skeleton 100. Obviously, according to actual needs, the front guard 600 can be deleted, so it is not limited to Figures 1 to 3 shown.

[0033] Combined with Figure 4 、 Figure 7 and Figure 10 , the extendable skeleton 100 for furniture includes a base frame 10, a seat cushion frame 20, a footrest mechanism 30, a seat cushion frame control assembly 40 (see Figure 15 and Figure 16 ), a linkage connecting rod 50, a backrest control assembly 60 and a backrest mechanism 70. The seat cushion frame 20 can move relative to the base frame 10 in the front-back 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 ), a preset intermediate position (see Figures 10 to 12 ) and a termination position (see Figures 15 to 17 ).

[0034] The backrest mechanism 70 is assembled at the rear end 21 of the seat cushion frame 20. The rear end 21 of the seat cushion frame 20 provides a supporting function and an assembly place for the backrest mechanism 70, and can move back and forth relative to the base frame 10 together with the seat cushion frame 20. The footrest mechanism 30 is assembled at the front end 22 of the seat cushion frame 20. The footrest mechanism 30 can at least switch between a retracted position (see Figure 1 and Figures 4 to 6 shown) and an extended position (see Figure 2 and Figures 10 to 12 shown) to meet the needs of users; the footrest mechanism 30 has two footrest swing rods 31(32) that are pivotally hinged to the seat cushion frame 20 and arranged one in front of the other, that is, the front footrest swing rod 31 and the rear footrest swing rod 32. The seat cushion frame control assembly 40 is assembled between the seat cushion frame 20 and the base frame 10 and is used to control the front-back movement of the seat cushion frame 20 relative to the base frame 10; the seat cushion frame control assembly 40 includes an outer link assembly 41 that together with the base frame 10 forms an outer four-bar linkage structure, an inner link assembly 42 that together with the seat cushion frame 20 forms an inner four-bar linkage structure (see Figure 10 ) and a transmission assembly 43 that makes the outer link assembly 41 and the inner link assembly 42 be in transmission connection (see Figure 15 and Figure 16 ), and the inner link assembly 42 has two inner links 421(423) that are pivotally hinged to the seat cushion frame 20 and arranged one in front of the other, that is, the front inner link 421 and the rear inner link 423.

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

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

[0037] Therefore, during the process of switching from the retracted position to the extended position, the footrest mechanism 30 drives the seat cushion frame control component 40 to move through the linkage connecting rod 50, and the moving seat cushion frame control component 40 causes the seat cushion frame 20 and the backrest mechanism 70 to move together from Figure 1 the initial position shown to Figure 2 the preset intermediate position shown; during the process of the backrest mechanism 70 following the seat cushion frame 20 to switch from Figure 2 the preset intermediate position shown to Figure 3 the terminal position shown, the backrest control component 60 controls (drives) the backrest mechanism 70 to adjust the angle, so as to meet 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 connecting rod 50 is always in front of the tail end 50b of the linkage connecting rod 50, so that the linkage connecting rod 50 maintains an inclined state. For example, Figure 5 , Figure 8 , Figure 11 and Figure 13 the front-up and rear-down inclined arrangement shown.

[0038] It should be noted that during the process of the sofa 1000 of the present invention switching from the sitting state (CLOSE) to the full reclining state (RELAX), when the footrest mechanism 30 switches from the retracted position to the extended position, correspondingly, the seat cushion frame control component 40 is driven by the linkage connecting rod 50 to cause the seat cushion frame 20 to switch from the initial position to the preset intermediate position, so that the sofa 1000 is in the leisure position state (TV) at this time; when the sofa 1000 is in the leisure position state (TV), during the process of continuing to cause the seat cushion frame 20 to switch from the preset intermediate position to the terminal position at this time, the backrest control component 60 controls (drives) the backrest mechanism 70 to move, so as to achieve the purpose of the backrest 200 following the backrest mechanism 70 to adjust the angle, thus achieving the purpose of the sofa 1000 switching from the leisure position state (TV) to the full reclining state (RELAX). More specifically, as follows:

[0039] As Figure 14 shown, in the left-right direction of the base frame 20, the inner link assembly 42 is located on the first side of the seat cushion frame 20 (for example, Figure 14 the inner side in Figure 14(on the outer side), at this time, the footrest swing rod 32 hinged to the linkage rod 50 moves from below the seat frame 20 to the first side of the seat frame 20 and extends upward; to better meet the need for the linkage rod 50 arranged on the first side of the seat frame 20 to be hinged to the rear footrest swing rod 32. Specifically, in Figure 5 and Figure 11 , as an example, the rear footrest swing rod 32 is provided with a first pivot hinge position 321 for pivotally swinging with the seat frame 20 and a second pivot hinge position 324 for being hinged to the linkage rod 50, and the first pivot hinge position 321 is above the second pivot hinge position 324; the front inner link 421 is provided with a third pivot hinge position 4213 for being hinged to the seat frame 20 and a fourth pivot hinge position 4214 for being hinged to the linkage rod 50, and the fourth pivot hinge position 4214 is above the third pivot hinge position 4213, and the third pivot hinge position 4213 is in front of the first pivot hinge position 321; thus, it can more effectively keep the linkage rod 50 in an inclined state during the process of the seat frame 20 switching between the initial position and the end position.

[0040] Such as Figure 12 , Figure 14 , Figure 15 and Figures 17 to 20 shown, as an example, the footrest mechanism 30 further has a first intermediate link 33 located below the seat frame 20 and extending along 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 frame 20 together form a four-bar linkage structure, and the state is shown in Figure 18 shown. In addition, a more detailed description of the footrest mechanism 30 is as follows:

[0041] In Figure 12 , Figure 14 , Figure 15 and Figures 17 to 20 , as an example, the footrest mechanism 30 further has a front footrest link 34, a rear footrest link 35, a second intermediate link 36, a first long link 37 and a second long link 38 extending along the front-rear direction of the base frame 10. Optionally, in Figure 6 and Figure 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 with a separation in the left-right direction of the seat frame 20, so that the first long link 37 is between the seat frame 20 and the second long link 38, and the state is shown in Figure 15As shown. The 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 link 32; the lower end of the front footrest link 34 is hinged to the front footrest swing link 31, and the upper end of the front footrest link 34 is successively hinged to the rear end 381 of the second long link 38 and the rear end 371 of the first long link 37; the second intermediate link 36 is hinged to both the rear footrest link 35 and the front footrest swing link 31, and the state is shown in Figure 17 As shown, so that the cooperation of the second intermediate link 36 and the rear footrest link 35 drives the first long link 37 at a speed greater than the speed at which the front footrest link 34 drives the second long link 38, thereby meeting the need for a speed difference between the first long link 37 and the second long link 38.

[0042] A first footrest head 39a with a supporting portion 391 is hinged to the front end of the first long link 37. A second footrest head 39b with a supporting portion 392 is hinged at a position away from the first long link 37. A short rod 39c is hinged to the second footrest head 39b. The front end 382 of the second long link 38 is successively hinged to the first footrest head 39a and the short rod 39c. Specifically, in Figure 6 、 Figure 9 、 Figure 11 、 Figure 12 、 Figure 13 、 Figure 14 and Figure 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 link 37, a second hinge structure 394 hinged to the front end 382 of the second long link 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. A fourth hinge structure 383 is provided on the front end 382 of the second long link 38 in front of the second hinge structure 394. A fifth hinge structure 396 is provided on the second footrest head 39b between the third hinge structure 395 and the supporting portion 392 of the second footrest head 39b. 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, where D1 > D3 > D4 > D2; the purpose of such a design is: when the footrest mechanism 30 switches to Figure 6When the footrest 39a is in the retracted position shown in FIG, the supporting portion 391 of the first footrest 39a is arranged forward, and the supporting portion 392 of the second footrest 39b is arranged downward, so as to meet the need of arranging the supporting portion 391 of the first footrest 39a and the supporting portion 392 of the second footrest 39b in a front-to-bottom arrangement, and also avoid the first footrest 39a and the second footrest 39b in this position state protruding from the seat cushion frame 20. Figure 1 and Figure 6 As shown; when the footrest mechanism 30 switches to Figure 11 In the extended position shown, 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 Figure 11 As shown; in addition, with the help 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 Figure 14 、 Figure 16 and Figures 17 to 20 As shown, as an example, the front footrest lever 31 is provided with a front upper hinge 311, a front lower hinge 312, a front middle hinge 315 located between the front upper hinge 311 and the front lower hinge 312, and a lower hinge 313 located to the side of the front lower hinge 312. The rear footrest lever 32 is provided with a rear middle hinge 322 and a rear lower hinge 323 in sequence from top to bottom at its lower end. The seat cushion frame 20 is hinged to the front swing upper hinge position 311, and the footrest front link 34 is hinged to the front swing lower hinge position 312; the first intermediate link 33 is hinged to the front swing middle hinge position 315 and the rear swing middle hinge position 322 respectively; this design makes it possible for the first intermediate link 33, the footrest front link 34 and the front footrest swing rod 31 to be hinged on different axes, and the first intermediate link 33, the footrest rear link 35 and the rear footrest swing rod 32 to be hinged on different axes.

[0044] Another example Figure 14 and Figures 17 to 20As shown, as an example, the rear footrest link 35 is provided with a rear connecting 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 respectively hinged to the lower hinge position 313 and the rear connecting intermediate hinge position 354. The rear connecting intermediate hinge position 354 is between the rear swing lower hinge position 323 and the rear upper hinge position 355. Optionally, as an example, the lower end of the rear footrest link 35 is a rearwardly bent structure, and the rear connecting intermediate hinge position 354 of the rear footrest link 35 is at the bending position of the rearwardly bent structure. Such a design better satisfies that the sliding speed of the first long link 37 driven by the four-bar linkage structure composed of the seat frame 20, the front footrest swing rod 31, the rear footrest swing rod 32 and the first intermediate link 33 is greater than the sliding speed of the second long link 38 driven by this four-bar linkage structure, so as to meet the purpose that the first long link 37 can slide relative to the second long link 38.

[0045] Again, Figure 14 and Figures 17 to 20 As shown, as an example, the front footrest link 34 is also provided with a front connecting intermediate 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 connecting intermediate 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 forwardly bent structure, and the front connecting intermediate hinge 343 of the front footrest link 34 is located at the bending position of the forwardly bent structure. Such a design can meet the need for a 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 in the front-rear direction of the seat frame 20 during the switching process of the footrest mechanism 30 between the extended position and the retracted position, so as to meet 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] Combined with Figure 6 、 Figure 9 and Figure 12 , the working principle of the footrest mechanism 30 is described as follows: When the Figure 6 shown footrest mechanism 30 in the retracted position is switched to Figure 12When in the extended position shown, at this time, the front footrest swing rod 31 pivots counterclockwise upward around the front swing upper hinge position 311, and the rear footrest swing rod 32 pivots counterclockwise upward around the rear first pivot hinge position 321. As a result, while driving the first intermediate link 33 to move, it also drives the front footrest front link 34 to swing clockwise forward around the front swing lower hinge position 312, drives the rear footrest rear link 35 to swing clockwise forward around the rear swing lower hinge position 323, and drives the second intermediate link 36 to rotate clockwise forward. Thus, it drives the first long link 37 and the second long link 38 to slide forward, and makes the sliding speed of the first long link 37 greater than that of the second long link 38. Exactly 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 pivots counterclockwise upward around the front swing upper hinge position 311 and the rear footrest swing rod 32 pivots counterclockwise upward around the first pivot hinge position 321 to Figure 12 the position shown, at this time, the supporting portions 391 of the first footrest head 39a and the supporting portions 392 of the second footrest head 39b just switch to the position arranged upward, and the state is shown in Figure 12 shown. It should be noted that Figure 9 is an intermediate position passed by the footrest mechanism 30 when switching from the retracted position to the extended position; in addition, since the process of the footrest mechanism 30 switching from the retracted position to the extended position is exactly opposite to the process from the extended position to the retracted position, it will not be elaborated here. Among them, in the above-mentioned footrest mechanism 30, it can reduce the space occupation amount in the up and down direction of the seat cushion frame 20.

[0047] As Figures 17 to 20 shown, as an example, the inner link assembly 42 also has an inner intermediate link 422. The inner intermediate link 422 extends along the front and rear direction of the base frame 10 and is arranged below the seat cushion frame 20. The inner intermediate link 422 is respectively hinged to the front inner link 421 and the rear inner link 422; such a 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, etc.

[0048] Another example is Figures 17 to 20As shown, as an example, the outer link assembly 41 includes an outer front link 411, an outer intermediate link 412, and an outer rear link 413. The outer intermediate link 412 extends in the front-rear direction of the base frame 10 and is located above the base frame 10. The outer front link 411 and the outer rear link 413 are each hinged to both the base frame 10 and the outer intermediate 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. The intermediate transmission rod 432 is hinged to both the middle part of the outer intermediate link 412 and the rear transmission rod 433. Therefore, the inner link assembly 42 that together with the seat cushion frame 20 forms an inner four-bar structure and the outer link assembly 41 that together with the base frame 10 forms an outer four-bar structure are linked together by the front transmission rod 431, the intermediate transmission rod 432, and the rear transmission rod 433, thereby ensuring the sequential movement of the inner link assembly 42 and the outer link assembly 41. Specifically, in Figure 19 and Figure 20 as an example, the outer front link 411 is provided with a hinge position 4111 for hinging with the front transmission rod 431; the outer intermediate link 412 is provided with a hinge position 4121 for hinging with the intermediate transmission rod 432, and the outer rear link 413 is provided with a hinge position 4131 for hinging with the rear transmission rod 433. The state is shown in Figure 19 and Figure 20 as shown

[0049] As Figures 4 to 20 shown, 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 tail end of the third control link 63 described below. The third hinge position 713 is arranged below the corresponding second hinge position 712. The state is shown in Figures 5 to 6As shown in the figure, a fourth hinge position 721 hinged to the rear end 21 of the seat cushion frame 20 and a fifth hinge position 722 hinged to the backrest rotating frame 73 are provided on the front-back swing rod 72. The fifth hinge position 722 is arranged above the corresponding fourth hinge position 721, and the fifth hinge position 722 is also arranged in front of the corresponding second hinge position 712, and the fourth hinge position 721 is arranged in front of the corresponding first hinge position 711. Optionally, as an example, the distance between the second hinge position 712 and the first hinge position 711 is P5, the distance between the fourth hinge position 721 and the fifth hinge position 722 is P6, the distance between the first hinge position 711 and the fourth hinge position 721 is P7, and the distance between the second hinge position 712 and the fifth hinge position 722 is P8. Among them, P7 > P5 > P6 > P8. Such a design enables the seat cushion frame 20, the backrest rear swing rod 71, the front-back swing rod 72, and the backrest rotating frame 73 to jointly enclose a trapezoidal four-bar linkage structure, so that the backrest rotating frame 73 can rotate and adjust the angle more greatly under the drive of the backrest rear swing rod 71.

[0050] As Figure 4 , Figure 5 , Figure 7 , Figure 8 , Figure 10 , Figure 11 , Figure 13 , Figure 15 and Figure 16 As shown in the figure, 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 end and lower end to form a fourth hinge center line C4. 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 such a design is to ensure that the backrest control assembly 60 drives the backrest rear swing rod 71 to make a pivoting motion only when the seat cushion frame 20 together with the backrest mechanism 70 moves forward relative to the base frame 10 to the preset intermediate position as shown in Figure 11 the figure. In addition, in combination with Figures 1 to 3 it can be known that the backrest 200 installed on the backrest rotating frame 73 rotates and adjusts relative to the seat cushion 300 installed on the seat cushion frame 20 around almost the same axis during the adjustment process, so there will be no defect of stretching the user's clothes. Specifically, as follows:

[0051] At Figure 5Among them, as 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, arrange it such that P2 > P1 > P7 > P5 > P6 > P8 > P3 > P4, which effectively ensures that the backrest control component 60 starts to control the angle adjustment of the backrest mechanism 70 only when the backrest mechanism 70 follows the seat cushion frame 20 and switches from the initial position to the preset intermediate position.

[0052] In addition, in Figure 5 , Figure 8 and Figure 11 among them, as an example, the backrest control component 60 further includes a second control swing rod 64 located behind the first control swing rod 61 and an intermediate control link 65 extending along 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 a rear fixing rod 90b extending along the left-right direction of the base frame 10 is connected to the position of the intermediate control link 65 behind the sixth hinge center line C6. Therefore, by means of the four-bar mechanism jointly constituted by the first control swing rod 61, the second control swing rod 64, the intermediate control link 64, and the base frame 10, the rearward distance of the rear fixing rod 90b relative to the rear end 11 of the base frame 10 can be shortened to adapt to more shapes of the sofa 1000; in addition, the minimum installation distance of the telescopic driver 80 described below can also be reduced, making the stroke of the telescopic driver 80 shorter. Therefore, when the speed of the telescopic driver 80 is limited, the opening speed of the furniture extension frame 100 becomes faster.

[0053] As shown in Figure 4 , Figure 7 , Figure 10 and Figure 15 shown, 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 slides telescopically on the driver body 81. At this time, a front fixing rod 90c extending along the left-right direction of the base frame 10 is fixed on the front footrest swing rod 31, and the state is shown in Figure 4 , Figure 7 , Figure 10 and Figure 15 shown; obviously, according to actual needs, a front fixing rod 90c can also be fixed on the rear footrest swing rod 32, so not taking Figure 4 , Figure 7 ,Figure 10 and Figure 15 as shown. Among them, the drive body 81 is hinged to the rear fixing rod 90b, and the telescopic body 82 is hinged to the front fixing rod 90c; obviously, according to actual needs, the drive body 81 can also be hinged to the front fixing rod 90c and the telescopic body 82 can be hinged to the rear fixing rod 90b, so it is not limited by Figure 4 , Figure 7 , Figure 10 and Figure 15 as shown. The spring 90a is connected to both the rear fixing rod 90b and the inner link assembly 42 (specifically the inner intermediate link 422); by means of the cooperation of the spring 90a and the telescopic drive 80, during the opening process of the footrest mechanism 30, the spring 90a is in a contracted state. Relatively speaking, the spring 90a provides assistance to the telescopic drive 80, enabling the telescopic drive 80 to easily open the footrest mechanism 30 with less force; in addition, through the cooperation of the spring 90a and the telescopic drive 80, the number of telescopic drives 80 used is reduced. It should be noted that the telescopic drive 80 can be, for example but not limited to, an electric push rod; in addition, in Figure 4 , Figure 7 , Figure 9 , Figure 10 , Figure 12 and Figure 15 , as an example, a cylinder 4221 for assembling and connecting with the front end of the spring 90a is provided at the rear end of the inner intermediate link 422.

[0054] For another example Figure 4 , Figure 7 , Figure 10 and Figure 15 as shown, as an example, the base frame 10, the seat cushion frame 20, the backrest mechanism 70, the backrest control component 60, the footrest mechanism 30, the linkage link 50 and the seat cushion frame control component 40 are arranged in a one - left - one - right corresponding manner in the left - right direction of the base frame 10. The left and right ends of the rear fixing rod 90b are each fixedly connected to the intermediate control link 65 in the same end, and the left and right ends of the front fixing rod 90c are each fixedly connected to the front footrest swing rod 31 in the same end, specifically to the fixed connection position 314 provided on the front footrest swing rod 31. Since the front fixing rod 90c is fixedly connected to the front footrest swing rod 31, it makes it easier for the telescopic drive 80 to drive the footrest mechanism 30 to open.

[0055] Combined with the attached drawings, the process of adjusting the sofa 1000 of the present invention from the sitting position state (CLOSE) to the full - lying position state (RELAX) will be described: When it is necessary Figure 1 to adjust the sofa 1000 in the sitting position state (CLOSE) shown to Figure 2When in the shown leisure position (TV), the telescopic driver 80 is working at this time. The working telescopic driver 80 drives the footrest mechanism 30 to move forward in an extended motion. The extended footrest mechanism 30 drives the seat cushion frame 20 to move forward relative to the base frame 10 through the linkage connecting rod 50 and the seat cushion frame control assembly 40. Since the backrest control assembly 60 is 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 respectively, and combined with Figure 5 and Figure 8 , the forward movement of the seat cushion frame 20 causes the third control link 63, the intermediate control link 65, the second control swing rod 64, and the first control swing rod 61 to pivot clockwise downward, and also causes the second control link 62 to pivot counterclockwise downward. And the spring 90a is in a contracted state during the opening process of the footrest mechanism 30, providing assistance to the telescopic driver 80, so that the telescopic driver 80 can easily open the footrest mechanism 30 with less force.

[0056] When the telescopic driver 80 drives the footrest mechanism 30 to move forward in an extended motion until it is fully in place and is in the state shown in Figure 2 , at this time, the telescopic body 82 of the telescopic driver 80 continues to extend forward, causing the seat cushion frame 20 together with the backrest mechanism 70 to continue to move forward, and under the control of the backrest control assembly 60, and combined with Figure 11 , Figure 13 and Figure 16 , it causes the third control link 63, the intermediate control link 65, the second control swing rod 64, and the first control swing rod 61 to pivot clockwise downward, and also causes the second control link 62 to pivot counterclockwise downward, thus achieving the purpose of adjusting the angle of the backrest rotating frame 73. The state is shown in Figure 3 and Figure 16 . Among them, during the process of the seat cushion frame 20 switching from the preset intermediate position to the termination position, the spring 90a is in a stretched state.

[0057] In addition, during the process of the seat cushion frame 20 and the backrest mechanism 70 switching together from the initial position to the preset intermediate position, the forward movement of the seat cushion frame 20 is slower than the extension of the footrest mechanism 30, so that the change range of the seat cushion frame 20 relative to the base frame 10 is small, and the sofa 1000 reaches a better TV state.

[0058] Compared with the prior art, by means of the design that "the tail end 50b of the linkage rod 50 is hinged to the front inner linkage rod 421, and the head end 50a of the linkage rod 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 drive the seat frame control assembly 40 through the linkage rod 50 to make the seat frame 20 and the backrest mechanism 70 switch from the initial position to the preset intermediate position together; combined with the design that "during the process of the seat frame 20 switching between the initial position and the end position, the head end 50a of the linkage rod 50 is always in front of the tail end 50b of the linkage rod 50", the linkage rod 50 always maintains an inclined state during this process and does not go through the switching of the pulling and pushing states (i.e., the tensile state and the compressive state), so that the seat frame 20 runs stably without a virtual position feeling and the user experience is good. In addition, during the process of switching from the retracted position to the extended position, the footrest mechanism 30 drives the seat frame control assembly 40 to move through the linkage rod 50, and the moving seat frame control assembly 40 makes the seat frame 20 and the backrest mechanism 70 switch from the initial position to the preset intermediate position together; when the seat frame 20 and the backrest mechanism 70 switch to the preset intermediate position together, the backrest control assembly 60 driven by the seat frame 20 starts to control the angle adjustment of the backrest mechanism 70; since the angle adjustment of the backrest mechanism 70 is carried out only when the backrest mechanism 70 follows the seat frame 20 to switch to the preset intermediate position relative to the base frame 10 together, 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 the zero-wall-adjacent occasion.

[0059] It should be noted that the zero-wall-adjacent here means that the backrest 200 of the sofa 1000 can be in contact with the wall and the distance between them is zero; for example, in Figures 1 to 3 , the vertical center line represents the position of the wall. When the sofa 1000 is in the sitting position (CLOSE), the distance between the backrest 200 of the sofa 1000 and the vertical center line is zero at this time, and during the process of the sofa 1000 switching from the sitting posture (CLOSE) to the leisure posture (TV) and the full reclining posture (RELAX) in sequence, the distance between the backrest 200 and the vertical center line becomes larger and larger, so the adjustment of the backrest 200 will not collide and interfere with the vertical center line.

[0060] It should be noted that the direction indicated by the arrow A in the attached drawing is the direction of the base frame 10 from back to front, the direction indicated by the arrow B in the attached drawing is the direction of the base frame 10 from left to right, and the direction indicated by the arrow C in the attached drawing is the direction of the base frame 10 from bottom to top. In addition, combined with Figure 5 、 Figure 8 、 Figure 11 and Figure 13It is known that under the control of the seat cushion frame control component 40, the seat cushion frame 20 also undergoes a certain angular change relative to the base frame 10 during the forward movement, so that the forward and backward movement of the seat cushion frame 20 is a swing. In addition, although the foregoing inner link assembly 42 and the seat cushion frame 20 together form an inner four-bar linkage structure, obviously, an inner five-bar linkage structure or the like can also be formed according to actual needs; similarly, the outer link assembly 41 that together with the base frame 10 forms an outer four-bar linkage structure can also form an outer five-bar linkage structure or the like with the base frame 10 according to actual needs; therefore, it is not limited to what is shown in the drawings.

[0061] The above-disclosed are only the preferred examples of the present invention, which are used to facilitate the understanding of those skilled in the art and to implement accordingly. Of course, the scope of the rights of the present invention cannot be limited by this. Therefore, the 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. A furniture extension frame comprising a base frame, a seat cushion frame, a backrest mechanism, a footrest mechanism and a seat cushion frame control assembly, wherein the seat cushion frame can move relative to the base frame in the front-to-rear direction 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, the footrest mechanism has at least one footrest swing rod hingedly connected to 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 is characterized in that The stretchable frame for furniture further includes a linkage rod and a backrest control assembly driven by the seat cushion frame to control the angle adjustment of the backrest mechanism. The seat cushion frame control assembly includes an outer link assembly that together with the base frame forms an outer multi-link structure, an inner link assembly that together with the seat cushion frame forms an inner multi-link structure, and a transmission assembly that drives the outer link assembly and the inner link assembly to be connected. The inner link assembly has at least one inner link hinged and pivotable with the seat cushion frame. The head end of the linkage rod is hinged to the footrest swing rod, and the tail end of the linkage rod is hinged to the inner link. 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, during the process of switching from the retracted position to the extended position, the footrest mechanism drives the seat cushion frame control assembly through the linkage rod to switch the seat cushion frame and the backrest mechanism together from the initial position to the preset intermediate position; during the process of the seat cushion frame and the backrest mechanism switching together from the initial position to the preset intermediate position, the forward movement of the seat cushion frame is slower than the extension of the footrest mechanism; during the process of the backrest mechanism following the seat cushion frame to switch from the preset intermediate position to the end position, the backrest control assembly controls the angle adjustment of the backrest mechanism; during the process of the seat cushion frame switching between the initial position and the end 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-right direction of the base frame, the inner link assembly is located on the first side of the seat cushion frame, and the footrest mechanism is located on the second side opposite to the seat cushion frame. The footrest swing rod hinged to the linkage rod extends upward from below the seat cushion frame to the first side of the seat cushion frame.

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

4. The furniture extension frame according to claim 1, characterized in that: The inner link assembly further has an inner intermediate link, and the inner intermediate link extends along the front-rear direction of the base frame and is arranged below the seat cushion frame; the inner links are arranged in a front-back arrangement, and the inner intermediate link is respectively hinged to the front and rear inner links; the tail end of the linkage rod 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-to-rear direction of the base frame. The two footrest rocker rods are arranged in a front-to-rear manner. 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 extendable frame for furniture 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 Footrest, the first footrest is hinged to a second footrest with a supporting portion at a position away from the first long connecting rod, and the second footrest is hinged to a short rod; the front end of the second long connecting rod is hinged 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 seat 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 seat cushion frame.

7. The extendable frame for furniture according to claim 6, characterized in that, The front footrest rocker is provided with a front upper hinge position, a front lower hinge position, a front middle hinge position located between the front upper hinge position and the front lower hinge position, and a lower hinge position located on the side of the front lower hinge position; the seat cushion frame is hinged to the front upper hinge position, the front footrest connecting rod is hinged to the front lower hinge position, and the first middle connecting rod is hinged to the front middle hinge position; the lower end of the rear footrest rocker is provided with a rear middle hinge position and a rear lower hinge position in sequence upward and downward; the rear footrest connecting rod is hinged to the rear lower hinge position, and the The first intermediate link is hinged to the rear swing intermediate hinge; the rear footrest 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 hinged to the lower hinge and the rear connection intermediate hinge respectively, and the rear connection intermediate hinge is located between the rear swing lower hinge and the rear connection upper hinge; the front footrest 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 extendable frame for furniture 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 located between its upper and lower ends and is also hinged to the rear end of the seat cushion frame 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 further comprises a telescopic driver and a spring, wherein the telescopic driver comprises a driver body and a telescopic body that telescopes and slides on the driver body; the backrest control assembly further comprises a second control rocker arm located behind the first control rocker arm and an intermediate control link extending in the front-rear direction of the base frame, the lower end of the second control rocker arm is hinged to the rear end of the base frame to form a fifth hinge centerline, the upper end of the second control rocker arm is hinged to the intermediate control link arm to form a sixth hinge centerline, the intermediate control link arm is hinged to the upper end of the first control rocker arm to form a seventh hinge centerline located behind the second hinge centerline, and the intermediate control link arm is connected to a rear fixed rod extending in the left-right direction of the base frame at a position behind the sixth hinge centerline, and a front fixed rod extending in the left-right direction of the base frame is fixed to the footrest rocker arm; 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 extendable frame for furniture 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 mounting the backrest 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 corresponding 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 corresponding fourth hinge position, and the fifth hinge position is also arranged in front of the corresponding second hinge position. The fourth hinge position is arranged in front of the corresponding first hinge position. The distance from the first hinge center line to the second hinge center line is P1, the distance from the second hinge center line to the fourth hinge center line is P2, the distance from the fourth hinge center line to the third hinge center line is P3, the distance from the third hinge center line to the third hinge position is P4, the distance from the second hinge position to the first hinge position is P5, the distance from the fourth hinge position to the fifth hinge position is P6, the distance from the first hinge position to the fourth hinge position is P7, and the distance from the second hinge position to the fifth hinge position is P8. Among them, P2 > P1 > P7 > P5 > P6 > P8 > P3 > P4.

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

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