Extendable frame for furniture and sofa with the same

Abstract

Extendable frame for furniture, comprising a base frame, a seat frame which is movable relative to the base frame in the direction of the front and rear axes and is provided with at least a starting position, a preset intermediate position and an end position, a backrest adjustment device attached to a rear end of the seat frame, a footrest device attached to a front end of the seat frame which can switch between a retracted and an extended position, and a seat frame control arrangement installed between the seat frame and the base frame to control movement of the seat frame from front to back relative to the base frame;The extendable frame for furniture further comprises a linkage assembly and a backrest control assembly, which is driven by the seat frame; a head end of the linkage assembly is articulated to the footrest assembly, and a rear end of the linkage assembly is articulated to the seat frame control assembly; the backrest control assembly is articulated to the rear end of the base frame, the rear end of the seat frame, and the backrest adjustment mechanism; when changing from the retracted to the extended position, the footrest assembly drives the seat frame actuating mechanism through the linkage assembly, causing the seat frame and the backrest adjustment mechanism to move together from the initial position to the preset intermediate position;During a process in which the backrest adjustment mechanism follows the seat frame from the preset intermediate position to the end position, the backrest control sets an angle of the backrest adjustment mechanism.

Description

AREA OF THE UTILITY MODEL

[0001] The present utility model relates to the field of furniture, in particular to an extendable frame (rack) for furniture and a sofa with the same. BACKGROUND OF THE UTILITY MODEL

[0002] With the continuous development of the economy and the progress of society, more and more consumer goods are provided to improve people's lives, among which sofas are a common example.

[0003] Currently, adjustable sofas with armrests are equipped with an internal extendable metal frame. This extendable metal frame includes a footrest, a seat cushion, and a backrest mechanism. Through a series of mechanical linkages, the relative positions and angles of the seat cushion and backrest can be adjusted, allowing the sofa to switch between sitting, reclining, and fully reclined positions to meet the user's needs.

[0004] However, with existing extendable metal frames, the footrest directly drives the backrest mechanism during extension, causing the backrest to tilt backward. This backward tilt takes up space behind the sofa, preventing the sofa from being placed flush against a wall. If the sofa's backrest is to be placed against a wall, it may collide with the wall during the footrest extension, causing both the backrest angle adjustment and the footrest extension to fail.

[0005] Additionally, with the footrest devices on the current extendable metal frame, the rear end of the first long rod is pivoted to the lower end of the rear footrest swing arm, and the rear end of the second long rod is pivoted to the lower end of the front footrest swing arm. Both the front and rear footrest swing arms are connected to the seat frame at their upper ends, resulting in the footrest device taking up a lot of vertical space when retracting and extending.

[0006] Therefore, there is an urgent need for an extendable frame for furniture and a sofa equipped with this extendable frame to overcome one or more of these problems. SUMMARY OF THE UTILITY MODEL

[0007] One objective of the present utility model is to provide an extendable frame for furniture. Under the coordination of the linkage assembly and the seat frame control unit, when the footrest assembly is extended, the seat frame and the backrest adjustment mechanism slide forward relative to the base frame into a preset intermediate position. This allows the backrest adjustment mechanism to be driven for angle adjustment, allowing adjustment without contact with the wall, thus achieving a play-free wall configuration.

[0008] A further objective of the present utility model is to provide a suitable sofa. Under the coordination of the rod assembly and the seat frame control unit, the seat frame and the backrest adjustment mechanism slide forward relative to the base frame into a preset intermediate position when the footrest mechanism is extended. This allows the backrest adjustment mechanism to be driven for angle adjustment, allowing adjustment without contact with the wall, thus achieving a play-free wall configuration.

[0009] To achieve the above-mentioned objectives, the present utility model provides an extendable frame for furniture, comprising a base, a seat frame, a backrest adjustment device, a footrest device, a seat frame actuating assembly, a linkage assembly, and a backrest actuating device. The seat frame is displaceable relative to the base frame in the front and rear directions and is provided with at least one initial position, a preset intermediate position, and a final position. The footrest is mounted at a front end of the seat frame and can be switched between a retracted and an extended position. The seat frame control assembly is installed between the seat frame and the base frame to control a forward-to-rearward movement of the seat frame relative to the base frame.A head end of the linkage assembly is pivotally connected to the footrest assembly, and a rear end of the linkage assembly is pivotally connected to the seat frame control assembly. The backrest actuator is pivotally connected to a rear end of the base frame, the rear end of the seat frame, and the backrest adjuster. When changing from the retracted to the extended position, the footrest assembly drives the seat frame operating unit through the linkage assembly, causing the seat frame and backrest adjuster to move together from the initial position to the preset intermediate position. During a process in which the backrest adjuster follows the seat frame from the preset intermediate position to the final position, the backrest control adjusts an angle of the backrest adjuster.

[0010] Compared to the prior art, the linkage assembly of the present application is hinged at its head end to the footrest assembly and at its rear end to the seat frame control assembly, and the backrest control assembly is hinged to the rear end of the base frame, the rear end of the seat frame. During the process of changing from the retracted position to the extended position, the footrest assembly and the backrest adjustment assembly, through the linkage assembly and the seat frame control assembly, cause the seat frame and the backrest adjustment assembly to jointly change from the initial position to the preset intermediate position. When the seat frame and the backrest adjustment jointly switch to the preset intermediate position, the backrest control controls the backrest adjustment for angle adjustment.For this reason, the angle adjustment of the backrest adjustment only occurs when the backrest adjustment device follows the seat frame to the preset intermediate position, which provides spatial freedom for the angle adjustment of the backrest adjustment device and thus makes the sofa of the present utility model suitable for zero-wall distance applications.

[0011] To achieve the above-mentioned objectives, a sofa of the present utility model comprises a backrest, a seat cushion, and the aforementioned extendable frame (frame) for furniture. The backrest is mounted on the swivel base of the backrest, and the seat cushion is mounted on the seat frame. BRIEF DESCRIPTION OF THE DRAWINGS Fig. Figure 1 is a plan view of the sofa in a sitting position according to the present utility model, seen from right to left, with the protective body concealed on the right side, the footrest device in a retracted position and the seat frame in an initial position. Fig. Figure 2 is a plan view of the sofa in reclining position, seen from right to left, with the protective body hidden on the right side, the footrest in the extended position and the seat frame in a preset intermediate position. Fig. Figure 3 is a plan view of the sofa in the fully reclined position, seen from right to left, with the protective body hidden on the right side, the footrest in the extended position and the seat frame in the final position. Fig. 4 is a plan view of the extendable frame for furniture in the Fig. 1. Fig. 5 is a perspective view of the Fig. 4. Fig. 6 is a layer view of Fig. 4, including the seat frame on the right side, the seat frame operating assembly, the linkage assembly, the base frame, the backrest adjustment device, the backrest operating device, the first telescopic drive, the second telescopic drive, the first fixed rod, the second fixed rod, the third fixed rod and the fourth hidden fixed rod. Fig. 7 is a plan view of the extendable frame for furniture in the Arabic numeral shown in Fig. Fig. 8 is a perspective view of the Fig. 7. Fig. 9 is a layer view of Fig. 7, with the seat frame on the right side, the seat frame control assembly, the linkage assembly, the base frame, the backrest adjustment device, the backrest control assembly, the first telescopic drive, the second telescopic drive, the first fixed rod, the second fixed rod, the third fixed rod and the fourth fixed rod concealed. Fig. 10 is a plan view of the extendable frame for furniture in the Fig. 3. Fig. 11 is a perspective view of the state shown in Fig. 10. Fig. 12 is a layer view of Fig. 10, with the seat frame on the right side, the seat frame actuating assembly, the linkage assembly, the base frame, the backrest adjusting device, the backrest actuating assembly, the first telescopic drive, the second telescopic drive, the first fixed rod, the second fixed rod, the third fixed rod and the fourth fixed rod concealed. Fig. 13 is a perspective view of Fig. 12. Fig. 14 is an exploded perspective view of Fig. 13. Fig. 15 is another perspective view of Fig. 13 viewed from a different perspective. Fig. Fig. 16 is an exploded perspective view of Fig. No. 15. Fig. Figure 17 shows a perspective view of the base frame, seat frame, seat frame control unit, backrest adjuster, backrest control unit, linkage assembly, and rear footrest swing arm assembled on the left side. Fig. 18 is an exploded perspective view of Fig. 17. Fig. 19 is an exploded perspective view of Fig. 18 viewed from a different perspective. DETAILED DESCRIPTION OF THE ILLUSTRATED EMBODIMENTS

[0012] In order to provide a detailed explanation of the technical content and structural features of the present utility model, the following is explained in more detail in conjunction with the method of implementation and the attached drawings.

[0013] Refers to Fig. 1 to 3, the sofa 1000 of the present utility model comprises an extendable furniture frame 100, a backrest 200 and a seat cushion 300. The backrest 200 is mounted on a backrest rotating frame 70 described below, and the seat cushion 300 is installed on a seat frame 20 described below. By operating the extendable furniture frame 100, the sofa 1000 can be rotated between a Fig. 1, a reclining position shown in 2 and a fully reclined position shown in 3 to suit the user's needs.

[0014] Specifically, as shown in FIGS. 1 to 3, the sofa 1000 further includes armrests 400 on both the left and right sides of the backrest 200 and the seat cushion 300, footrests 500 mounted on the footrest device 30 described below, and a front support frame 600 disposed under the front lower part of the extendable furniture frame 100. The front support frame 600 is fixedly connected to the armrests 400 on both sides, the extendable furniture frame 100 is located between the armrests 400, and the subframe 10 of the extendable furniture frame 100, as described below, is fixedly connected to the armrests 400. The armrests 400 provide a mounting location and support for the extendable furniture frame 100. It should be noted that although the Fig. 1 to 3 show that the sofa 1000 includes armrests 400 arranged on both sides of the backrest 200 and the seat cushion 300, the footrests 500 are mounted on the footrest device 30, and the front support frame 600 is arranged under the extendable frame 100 for furniture, the sofa 1000 of the present application is not limited to that shown.

[0015] Refers to Fig. 5, Fig. 8 and Fig. 11, the extendable frame 100 for furniture comprises a base frame 10, a seat frame 20, a footrest device 30, a seat frame control assembly 40 (referring to Fig. 7), a linkage assembly 50, a backrest control assembly 60 (related to Fig. 4) and a backrest adjustment device 70. The seat frame 20 can move relative to the base frame 10 in the direction of the front and rear axle, and the seat frame 20 has at least one starting position (relative to Fig. 4 to 6), a preset intermediate position (relative to Fig. 7 to 9) and an end position (relative to Fig. 10 to 12) relative to the base frame 10.

[0016] The backrest adjustment device 70 is mounted on the rear end 21 of the seat frame 20. The rear end 21 of the seat frame 20 provides support and a mounting location for the backrest adjustment device 70, which slides together with the seat frame 20 relative to the base frame 10. The footrest device 30 is mounted on the front end 22 of the seat frame 20, which can be moved between a retracted position (as in Fig. 1 and 4 to 6) and an extended position (as in Fig. 2 and 7 to 10) to meet the needs of the user. The seat frame control assembly 40 is mounted between the seat frame 20 and the base frame 10 to control the movement of the seat frame 20 relative to the base frame 10. The head end 51 of the linkage assembly 50 is pivotally connected to the footrest assembly 30, and the rear end 52 of the linkage assembly 50 is pivotally connected to the seat frame control assembly 40, whereby the footrest assembly 30 can be connected to the seat frame control assembly 40 via the linkage assembly 50. The backrest actuating assembly 60 is pivotally connected to the rear end 11 of the base frame 10, the rear end 21 of the seat frame 20, and the backrest adjusting assembly 70. The backrest actuating assembly 60 is also driven by the movement of the seat frame 20. That is, during the movement of the seat frame 20, the backrest control device 60 moves relative to the base frame 10.

[0017] Based on these configurations, the footrest device 30 drives the seat frame control assembly 40 through the linkage assembly 50 during the change from the retracted to the extended position, whereby the seat frame 20 together with the backrest adjustment device 70 is moved from the initial position shown in Fig. 1, to the preset intermediate position shown in Fig. 2. When the backrest adjustment device 70 moves the seat frame 20 from the preset intermediate position to Fig. 2 to the final position in Fig. 3, the backrest control assembly 60 controls the backrest adjustment device 70 for adjusting the angle of the backrest 200, which is mounted on the backrest adjustment device 70. Note that during the transition of the sofa 1000 from the sitting position to the fully reclined position, when the footrest assembly 30 changes from the retracted to the extended position, the linkage assembly 50 drives the seat frame control assembly 40, thereby changing the seat frame 20 from the initial position to the preset intermediate position, so that the sofa 1000 is in the reclining position.When the sofa 1000 is in the reclining position, further movement of the seat frame 20 from the preset intermediate position to the end position causes the backrest control assembly 60 to move the backrest adjustment device 70 and thereby adjust the angle of the backrest 200, which enables the sofa 1000 to be switched from the reclining position to the fully reclined position.

[0018] More precisely, as in the Fig. 5 to 9, the footrest device 30 comprises, as an embodiment, a front footrest swing arm 31, a rear footrest swing arm 32, a first intermediate link arm 33, a front footrest link arm 34, a rear footrest link arm 35, a second intermediate link arm 36, and a first long link arm 27 and a second long link arm 38 extending in the front-rear direction of the base frame 10. As an option, as shown in the Fig. 6 and Fig. 9, the first long connecting arm 37 is longer than the second long connecting arm 38. The first long connecting arm 37 and the second long connecting arm 38 are arranged side by side in the left-right direction of the seat frame 20, so that the first long connecting arm 37 is arranged between the seat frame 20 and the second long connecting arm 38, as shown in Fig. 8.

[0019] Furthermore, the first intermediate link arm 33 is located below the seat frame 20 and extends in the front-to-back direction over the base frame 10. The front footrest swing arm 31 is pivotally connected to both the seat frame 20 and the front end of the first intermediate link arm 33, as shown in Fig. 10. The rear footrest swing arm 32 is pivotally connected to both the seat frame 20 and the rear end of the first intermediate link arm 33, as shown in Fig. 15. The upper end of the rear footrest link arm 35 is pivotally connected to the rear end 371 of the first long link arm 37, and the lower end of the rear footrest link arm 35 is pivotally connected to the rear footrest swing arm 32 (specifically, to the first lower hinge point 323 described below). The lower end of the front footrest link arm 34 is pivotally connected to the front footrest swing arm 31, and the upper end of the front footrest link arm 34 is pivotally connected to the rear end 381 of the second long link arm 38 and the rear end 371 of the first long link arm 37.The second intermediate link arm 36 is pivotally connected to both the rear footrest link arm 35 and the front footrest swing arm 31, as shown in Fig. 12, so that the second intermediate link arm 36 and the rear footrest link arm 35 together drive the first long link arm 37 at a speed greater than the speed of the drive of the second long link arm 38 by the front footrest link arm 34, thus creating a speed difference between the first long link arm 37 and the second long link arm 38.

[0020] Furthermore, the front end 372 of the first long connecting arm 37 is pivotally connected to the first footrest head 39a, which has a support portion 391. The position of the first footrest head 39a, away from the first long connecting arm 37, is pivotally connected to the second footrest head 39b, which has a support portion 392. The second footrest head 39b is pivotally connected to a short arm 39c, and the front end 382 of the second long connecting arm 38 is pivotally connected to the first footrest head 39a and the short arm 39c.

[0021] Specifically, as shown in FIGS. 6, 9, 12, and 13, for one embodiment, the first footrest head 39a is provided with a first hinge point 393 hinged to the front end 372 of the first long connecting arm 37, a second hinge point 394 hinged to the front end 382 of the second long connecting arm 38, and a third hinge point 395 hinged to the second footrest head 39b. The second hinge point 394 is adjacent to the first hinge point 393. The front end 382 of the second long connecting arm 38 is provided with a fourth hinge point 383 located forward of the second hinge point 394. The second footrest head 39b is provided with a fifth hinge point 396, which is located between the third hinge point 395 and the support portion 392 of the second footrest head 39b.The short arm 39c is hinged to both the fourth hinge point 383 and the fifth hinge point 396.

[0022] Optionally, the distance from the second hinge point 394 to the third hinge point 395 is D1, the distance from the third hinge point 395 to the fifth hinge point 396 is D2, the distance from the fifth hinge point 396 to the fourth hinge point 393 is D3, and the distance from the fourth hinge point 393 to the second hinge point 394 is D4, where D1 > D3 > D4 > D2. The purpose of this arrangement is that when the footrest device 30 is switched to the retracted position shown in FIG. 4, the support portion 391 of the first footrest head 39a is arranged forward and the support portion 392 of the second footrest head 39b is arranged downward. This arrangement can prevent the first and second footrest heads 39a and 39b from protruding beyond the seat frame 20 in this position, as shown in Fig. 4. When the footrest device 30 is in the position shown in Fig. In Fig. 7, the support sections 391 and 392 of the first and second footrest heads 39a and 39b are arranged upwards for foot support, as in Fig. 7. Furthermore, due to the arrangement of D1 > D3 > D4 > D2, the space required for switching the support portion 391 of the first footrest head 39a between the forward and upward positions, as well as the space required for switching the support portion 392 of the second footrest head 39b between the downward and upward positions, can be reduced. This ensures that the footrests 500 mounted on the support parts 391 and 392 do not collide with the front support frame 600 during position switching.

[0023] As shown in FIGS. 6 and 9, as an embodiment, an arcuate elongated hole 373 is provided at the rear end 371 of the first long link arm 37, and a limiting projection 353 is provided on the rear footrest link arm 35 and positioned within the arcuate elongated hole 373. When the footrest device 30 is switched to the retracted position, the limiting projection 353 abuts the hole wall 3731 at one end of the arcuate elongated hole 373, as shown in Fig. 6. When the footrest device 30 is switched to the extended position, the limiting projection 353 abuts the hole wall 3731 at the other end of the arcuate elongated hole 373, as shown in Fig. 9. The purpose of this configuration is to effectively prevent the footrest device 30 from being over-pressed or over-pressed.

[0024] As in the Fig. As shown in Figures 8 to 12, the front footrest swing arm 31 is provided as an embodiment with a second upper hinge point 311, a second lower hinge point 312, and a lowermost hinge point 313 located below the second lower hinge point 312. The seat frame 20 is hinged to the second upper hinge point 311, while the front footrest connecting arm 34 and the first intermediate connecting arm 33 are both hinged to the second lower hinge point 312, so that the front footrest connecting arm 34, the first intermediate connecting arm 33, and the front footrest swing arm 31 can be hinged coaxially.The rear footrest swing arm 32 is provided with an upper rear hinge point 321 hinged to the seat frame 20, a lateral hinge point 322 located forward of the upper rear hinge point 321, and a first lower hinge point 323 hinged to the rear end of the first intermediate link arm 33. The first lower hinge point 323 is also hinged to the rear footrest link arm 35, so that the rear footrest link arm 35, the first intermediate link arm 33, and the rear footrest swing arm 32 can be coaxially hinged.

[0025] In addition, as described in the Fig. 8 to 12, as an embodiment, the rear footrest connecting arm 35 is provided with a rear intermediate hinge point 354 and a first upper hinge point 355 hinged to the rear end 371 of the first long connecting arm 37. The second intermediate connecting arm 36 is hinged to both the lowermost hinge point 313 and the rear intermediate hinge point 354. The rear intermediate hinge point 354 is located between the first lower hinge point 323 of the rear footrest swing arm 32 and the first upper hinge point 355 of the rear footrest connecting arm 35. Optionally, the lower end of the rear footrest connecting arm 35 can be formed as a rearwardly bent flexure, with the rear intermediate hinge point 354 disposed on the flexure.In this way, the sliding speed of the first long link arm 37, driven by the four-bar linkage formed by the seat frame 20, the front footrest swing arm 31, the rear footrest swing arm 32, and the first intermediate link arm 33, can be faster than that of the second long link arm 38. As a result, the first long link arm 37 can slide relative to the second long link arm 38. In addition, the arcuate elongated hole 373 is arranged around the first upper hinge point 355.

[0026] As shown in FIGS. 8 to 12, as an embodiment, the front footrest link arm 34 is further provided with a front intermediate hinge point 343 and a front upper hinge point 344. The rear end 382 of the second long link arm 38 is hinged to the front intermediate hinge point 343 of the front footrest link arm 34, while the first long link arm 37 is hinged to the front upper hinge point 344 of the front footrest link arm 34. Alternatively, as an embodiment, the upper end of the front footrest link arm 34 is a forwardly bent flexure, and the front intermediate hinge point 343 of the front footrest link arm 34 is located on the flexure.In this way, the first long link arm 37 and the second long link arm 38 can be tightly fitted, and the first long link arm 37 can reliably slide relative to the second long link arm 38 while moving the footrest assembly 30 between the extended and retracted positions. This satisfies the requirement that the first long link arm 37 drives the support portion 391 of the first footrest head 39a to pivot between the forward and upward positions.

[0027] Further with reference to Fig. 6 and Fig. 9 explains the functional principle of the footrest device 30. When switching the footrest device 30 from the retracted position, which is Fig. 6 into the extended position, which in Fig. 9, the front footrest swing arm 31 rotates counterclockwise about the second upper hinge 311, and the rear footrest swing arm 32 rotates counterclockwise about the first upper hinge 321, thereby moving the first intermediate link arm 33 upward. At the same time, the front footrest link arm 34 swings clockwise about the first lower hinge 312, and drives the rear footrest link arm 35 to swing clockwise about the first lower hinge 323, and also drives the second intermediate link arm 36 to rotate clockwise. As a result, the first long link arm 37 and the second long link arm 38 slide forward, with the sliding speed of the first long link arm 37 being greater than that of the second long link arm 38.Due to the forward sliding of the first and second long link arms 37 and 38, the first footrest head 39a, the second footrest head 39b, and the short arm 39c thus rotate counterclockwise. When the front footrest swing arm 31 rotates counterclockwise about the second upper hinge 311 and the rear footrest swing arm 32 rotates counterclockwise about the first upper hinge 321 to the position shown in Fig. 9, the support portion 391 of the first footrest head 39a and the support portion 392 of the second footrest head 39b are positioned exactly in the upward position as shown in Fig. 9. Fig. 9. It should be noted that the process of switching the footrest device 30 from the retracted position to the extended position is exactly the opposite of the process from the extended position back to the retracted position, which will not be explained in detail here.

[0028] In the footrest device 30, the front footrest swing arm 31 is hinged to both the seat frame 20 and the front end of the first intermediate link arm 33, the rear footrest swing arm 32 is hinged to both the seat frame 20 and the rear end of the first intermediate link arm 33, the upper end of the rear footrest link arm 35 is hinged to the rear end 371 of the first long link arm 37, the lower end of the rear footrest link arm 35 is hinged to the rear footrest swing arm 32, the lower end of the front footrest link arm 34 is hinged to the front footrest swing arm 31, the upper end of the front footrest link arm 34 is hinged successively to the rear end 381 of the second long link arm 38 and the rear end 371 of the first long connecting arm 37,The second intermediate link arm 36 is hinged to both the rear footrest link arm 35 and the front footrest swing arm 31, the front end 372 of the first long link arm 37 is hinged to the first footrest head 39a, the second footrest head 39b is hinged to the short arm 39c, and the front end 382 of the second long link arm 38 is hinged to both the first footrest head 39a and the short arm 39c, which is why the first and second long link arms 37 and 38 can slide relative to the seat frame 20 during the retraction and extension of the footrest device 30, thereby reducing the space required in the vertical direction of the seat frame 20.

[0029] As shown in FIGS. 4 to 19, the seat frame control assembly 40 includes an outer linkage assembly 41, which is an outer four-bar linkage formed with the base frame 10, an inner linkage 42, which is an inner four-bar linkage formed with the seat frame 20, and a gear assembly 43 connecting the outer linkage assembly 41 and the inner linkage assembly 42. At this point, the head end 51 of the linkage assembly 50 is pivotally connected to the rear footrest swing arm 32, and the rear end 52 of the linkage assembly 50 is pivotally connected to the inner linkage assembly 42, whereby the pivoting movement of the rear footrest swing arm 32 can be transmitted to the base frame 10 via the linkage assembly 50.the inner linkage assembly 42, the gear assembly 43 and the outer linkage assembly 41, so that the retraction and extension of the footrest assembly 30 precedes the forward and rearward movement of the seat frame 20.

[0030] Specifically, the inner link arrangement 42 comprises, as an embodiment in the Fig. 17 to 19, an inner front link 421, an inner center link 422, and an inner rear link 423. The inner center link 422 extends along the front-rear wheel direction of the base frame 10 and is arranged below the seat frame 20. The inner front link 421 and the inner rear link 423 are each articulated to both the seat frame 20 and the inner center link 422. The outer link assembly 41 includes an outer front link 411, an outer center link 412, and an outer rear link 413. The outer center link 412 extends along the front-rear wheel 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 pivotally connected to both the base frame 10 and the outer center link 412. The transmission assembly 43 includes a front transmission rod 431, a middle transmission rod 432, and a rear transmission rod 433.The front transmission rod 431 is pivotally connected to both the inner center rod 422 and the outer front link 411, the rear transmission rod 433 is pivotally connected to both the outer rear link 413 and the inner center rod 422, and the center transmission rod 432 is pivotally connected to both the center portion of the outer center rod 412 and the center portion of the front transmission rod 431. Therefore, the inner link assembly 42, which forms the inner four-bar linkage with the seat frame 20, and the outer link assembly 41, which forms the outer four-bar linkage with the base frame 10, are interconnected by the front transmission rod 431, the middle transmission rod 432, and the rear transmission rod 433, ensuring the sequential movement of the inner and outer link assemblies 42 and 41.

[0031] As shown in FIGS. 8, 9, 11, 12, 13, 17, 18, and 19, the linkage assembly 50, as one embodiment, comprises a first linkage arm, a second link arm 53, and a third link arm. The first linkage arm forms the head end 51 of the linkage assembly 50; i.e., reference numeral 51 also represents the first linkage arm. One end of the first link arm 51 is hinged to the lateral hinge point 322, and the other end of the first link arm 51 is hinged to one end of the second link arm 53, thereby forming a first hinge point 54. The other end of the second link arm 53 is hinged to one end of the third link arm, thereby forming a second hinge point 55. The second link arm 53 is also hinged to the seat frame 20 at a position between its two ends, thereby forming a third hinge point 56.In this way, a four-bar linkage is formed by the seat frame 20, the rear footrest swing arm 32, the first linkage arm 51, and the second linkage arm 53. The other end of the third linkage arm is hinged to the inner control arm assembly 42 (specifically, the inner rear control arm 423) and forms a fourth hinge point 57. The third linkage arm forms the rear end 52 of the control arm assembly 50, i.e., reference numeral 52 also represents the third linkage arm. With such arrangements, the retraction and extension of the footrest assembly 30 and the movement of the seat frame 20 relative to the base frame 10 are better coordinated.

[0032] As shown in FIGS. 4 to 19, the backrest adjustment device 70 comprises, as an embodiment, a rear backrest swing arm 71, a front backrest swing arm 72, and a backrest pivot frame 73, which allows the backrest 200 to be mounted and angle-adjusted by rotation. The rear backrest swing arm 71 has a first hinge point 711, which is hinged to the rear end 21 of the seat frame 20, a second hinge point 712, which is hinged to the pivoting frame 73 of the backrest, and a third hinge point 713, which is hinged to the backrest actuating device 60. The third hinge point 713 is positioned below the second hinge point 712, as shown in FIGS. Fig. 6 and Fig. 7. The front backrest swing arm 72 has a fourth hinge point 721 hinged to the rear end 21 of the seat frame 20 and a fifth hinge point 722 hinged to the backrest pivot frame 73. The fifth hinge point 722 is located above the fourth hinge point 721 and in front of the second hinge point 712. The fourth hinge point 721 is positioned in front of the first hinge point 711. As an embodiment, the distance from the second hinge point 712 to the first hinge point 711 is P5, the distance from the fourth hinge point 721 to the fifth hinge point 722 is P6, the distance from the first hinge point 711 to the fourth hinge point 721 is P7, and the distance from the second hinge point 712 to the fifth hinge point 722 is P8, where P7 > P5 > P6 > P8.In this way, a trapezoidal four-bar linkage is formed by the seat frame 20, the rear backrest swing arm 71, the front backrest swing arm 72 and the backrest rotating frame 73, whereby the backrest rotating frame 73 can rotate at a larger angle under the drive of the rear backrest swing arm 71.

[0033] As in the Fig. 4, Fig. 6, Fig. 7, Fig. 9, Fig. 10 and Fig. 12, the seatback control assembly 60, as one embodiment, includes a first control link arm 61, a second control link arm 63, and a third control link arm 62. The head end of the first control link arm 61 is hinged to the rear end 11 of the base frame 10 at a first hinge centerline C1. The rear end of the first control link arm 61 is hinged to the head end of the second control link arm 63 to form a second hinge centerline C2. The rear end of the second control link arm 63 is hinged to the head end of the third control link arm 62 to form a third hinge centerline C3. The second control link arm 63 is also hinged to the rear end 21 of the seat frame 20 to form a fourth hinge centerline C4. The rear end of the third control link arm 62 is hinged to the third hinge point 713.The distance from the centerline of the first joint C1 to the centerline of the second joint C2 is P1, the distance from the centerline of the second joint C2 to the centerline of the fourth joint C4 is P2, the distance from the centerline of the fourth joint C4 to the centerline of the third joint C3 is P3, and the distance from the centerline of the third joint C3 to the third pivot point 713 is P4. Furthermore, P2 > P1 > P7 > P5 > P6 > P8 > P3 > P4 are included. Such an arrangement ensures that the backrest control assembly 60 effectively controls the rear backrest rocker 71 to pivot only when the seat frame 20 and the backrest adjuster 70 move together relative to the base frame 10 to the preset intermediate position shown in FIG. 9. Furthermore, as shown in FIGS. Fig. 1 to 3, during the adjustment process, the backrest 200 mounted on the backrest pivot frame 73 rotates almost about the same axis relative to the seat cushion 300 mounted on the seat frame 20, thereby preventing the user's clothing from being stretched.

[0034] As shown in FIGS. 5, 8, and 11, the extendable furniture frame 100 further comprises, as an embodiment, a first telescopic actuator 80a and a second telescopic actuator 80b. The first telescopic actuator 80a includes an actuator body 81 and a telescopic body 82 that slides telescopically on the actuator body 81. The actuator body 81 of the first telescopic actuator 80a is pivotally connected to the rear end 21 of the seat frame 20, while the telescopic body 82 is pivotally connected to the rear footrest swing arm 32. In this way, the first telescopic actuator 80a provides power for extending and retracting the footrest assembly 30 and power for the backrest adjustment assembly 70 to move together with the seat frame 20 from the initial position to the preset intermediate position. Of course, depending on the actual requirements, the telescopic body 82 of the first telescopic drive 80a can also be hinged to the front footrest swing arm 31, as in Fig. 5, Fig. 8 and Fig. 11.

[0035] In particular, the second telescopic drive 80b comprises an actuator body 83 and a telescopic body 84 that slides telescopically on the actuator body 83. The actuator body 83 of the second telescopic drive 80b is hinged to the rear end 11 of the base frame 10, while the telescopic body 84 of the second telescopic drive 80b is hinged to the outer link assembly 41 (in particular, the outer rear link 413). In this way, the second telescopic drive 80b provides the force for the backrest adjustment device 70 to follow the movement of the seat frame 20 from a preset intermediate position to the end position, as well as for the angular adjustment of the backrest adjustment device 70.

[0036] Furthermore, the base frame 10, the seat frame 20, the backrest adjustment device 70, the backrest actuating device 60, the footrest device 30, the linkage assembly 50, and the seat frame actuating device 40 are arranged in pairs, and each pair is arranged in the left-right direction. A first fixed rod 91 is fixed between the rear ends 11 of the two base frames 10, a second fixed rod 92 is fixed between the outer control arm assemblies 41, a third fixed rod 93 is fixed between the rear ends 21 of the two seat frames 20, and a fourth fixed rod 94 is fixed between the rear footrest rockers 32.The telescopic body 82 of the first telescopic drive 80a is articulated to the fourth fixed rod 94, the actuator body 82 of the first telescopic drive 80a is articulated to the third fixed rod 93, the telescopic body 84 of the second telescopic drive 80b is articulated to the second fixed rod 92, and the actuator body 83 of the second telescopic drive 80b is articulated to the first fixed rod 91.

[0037] Referring to the drawings, the process of adjusting the sofa 1000 of the present utility model from a sitting position to a fully reclining position follows. When the sofa 1000 is in the Fig. 1 needs to be adjusted to the reclining position shown in Fig. 2, the first telescopic drive 80a is activated. Accordingly, the first telescopic drive 80a drives the footrest assembly 30 to extend forward; as a result, the extendable footrest assembly 30 causes the seat frame 20 to move forward relative to the base frame 10 through the linkage assembly 50 and the seat frame control assembly 40. Since the backrest actuating assembly 60 is hinged to the rear end 21 of the seat frame 20, the rear end 11 of the base frame 10, and the backrest adjustment assembly 70, respectively, the forward movement of the seat frame 20 causes the third control link arm 62 and the first control link arm 61 to pivot downward in a clockwise direction, and the second control link arm 63 to pivot downward in a counterclockwise direction (as shown in Fig. Fig. 4 and Fig. 7).

[0038] When the first telescopic drive 80a drives the footrest device 30 to move fully forward, as shown in Fig. 2, the telescopic body 84 of the second telescopic drive 80b extends forward, whereby the extendable telescopic body 84 drives the seat frame 20 and the backrest adjustment device 70 forward. Under the control of the backrest control unit 60 and as shown in Fig. 10 and Fig. 12, the rear backrest swing arm 71 and the front backrest swing arm 72 of the backrest adjustment device 70 pivot downward clockwise, thereby rotating the backrest pivot frame 73 counterclockwise downward, thereby achieving the angular adjustment of the backrest pivot frame 73, as shown in FIGS. 3 and 11.

[0039] Compared to the prior art, the linkage assembly 50 of the present application is articulated at its head end 51 to the footrest assembly 30 and at its rear end 52 to the seat frame actuating assembly 40, and the backrest actuating assembly 60 is each articulated to the rear end 11 of the base frame 10. The rear end 21 of the seat frame 20 and the backrest adjustment assembly 70 thus cause the footrest assembly 30, through the linkage assembly 50 and the seat frame actuating assembly 40, to jointly switch the seat frame 20 and the backrest adjustment assembly 70 from the initial position to the preset intermediate position during the process of changing from the retracted position to the extended position.When the seat frame 20 and the backrest adjustment device 70 switch to the preset intermediate position together, the backrest control device 60 controls the backrest adjustment device 70 for angle adjustment. For this reason, the angle adjustment of the backrest adjustment device 70 only occurs when the backrest adjustment device 70 follows the seat frame 20 to the preset intermediate position, which provides spatial clearance for the angle adjustment of the backrest adjustment device 70, making the sofa 1000 of the present utility model suitable for zero-clearance wall applications. It is important to note that "zero-clearance wall" here refers to the fact that the backrest 200 of the sofa 1000 can be positioned directly against the wall, with no clearance therebetween. As an embodiment in . Fig. 1 to 3, the vertical center line represents the position of the wall, and when the sofa 1000 is in the sitting position, the distance between the backrest 200 of the sofa 1000 and the vertical center line is zero. As the sofa 1000 transitions from the sitting position to the reclining position and the fully reclined position, the distance between the backrest 200 and the vertical center line increases, thereby preventing collision or interference between the backrest 200 and the vertical center line during adjustment of the backrest 200.

[0040] It is worth noting that the direction indicated by arrow A in the drawings is from the back to the front of the base frame 10, the direction indicated by arrow B is from the left to the right of the base frame 10, and the direction indicated by arrow C is from the bottom to the top of the base frame 10. In addition, as shown in Fig.In Fig.13, the rear end 11 of the base frame 10 is bent to form a first bent fixed link part 911 for fixed connection with the first fixed rod 91, the outer rear joint 413 is bent to form a second bent fixed link part 921 for fixed connection with the second fixed rod 92, the rear end 21 of the seat frame 20 is bent to form a third bent fixed part 931 for fixed connection with the third fixed rod 93, and the rear footrest swing arm 32 is bent to form a fourth bent fixed part 941 for fixed connection with the fourth fixed rod 94. Furthermore, FIGS.4, 7 and 10 show that under the control of the seat frame control assembly 40, the seat frame 20 also undergoes a certain angular change relative to the base frame 10 during the forward movement, whereby the forward and backward movements of the seat frame 20 result in a swinging or pivoting movement.

[0041] The above disclosure is only a preferred embodiment of the present utility model and cannot be used to limit the scope of the present utility model. Therefore, any equivalent modifications made in accordance with the claims of the present utility model fall within the scope of the present utility model.

Claims

[1] An extendable frame for furniture, comprising a base frame, a seat frame which is displaceable relative to the base frame in the direction of the front and rear axes and is provided with at least one initial position, one preset intermediate position and one final position, a backrest adjustment device mounted at a rear end of the seat frame, a footrest device mounted at a front end of the seat frame and which can switch between a retracted and an extended position, and a seat frame control arrangement installed between the seat frame and the base frame in order to control a movement of the seat frame from front to rear relative to the base frame;The extendable frame for furniture further comprises a linkage assembly and a backrest control assembly driven by the seat frame, a head end of the linkage assembly is pivotally connected to the footrest assembly, and a rear end of the linkage assembly is pivotally connected to the seat frame control assembly; the backrest control assembly is pivotally connected to the rear end of the base frame, the rear end of the seat frame, and the backrest adjustment assembly; when changing from the retracted to the extended position, the footrest assembly drives the seat frame actuating assembly through the linkage assembly, causing the seat frame and the backrest adjustment assembly to move together from the initial position to the preset intermediate position;During an operation in which the backrest adjustment device follows the seat frame from the preset intermediate position to the end position, the backrest control sets an angle of the backrest adjustment device.; [2] An extendable furniture frame according to claim 1, wherein the footrest device comprises a front footrest swing arm, a rear footrest swing arm, and a first intermediate link arm disposed below the seat frame and extended in the front-rear wheel direction of the base frame; the front footrest swing arm is pivotally connected to both the seat frame and a front end of the seat; the first intermediate link arm and the rear footrest swing arm are pivotally connected to both the seat frame and a rear end of the first intermediate link arm;the control assembly of the seat frame includes an outer linkage assembly which is an outer four-bar linkage mechanism formed with the base frame, an inner linkage assembly which is an inner four-bar linkage mechanism formed with the seat frame, and a gear assembly connecting the outer linkage assembly to the inner linkage assembly, and a head end of the linkage assembly is pivotally connected to the rear footrest swing arm, and a rear end of the linkage assembly is pivotally connected to the inner linkage assembly.; [3] An extendable frame for furniture according to claim 2, wherein the linkage assembly comprises a first linkage arm, a second linkage arm and a third linkage arm, wherein the rear footrest swing arm is provided with a first upper hinge point hinged to the seat frame, a lateral hinge point disposed at an end face of the first upper hinge point, and a first lower hinge point hinged to the rear end of the first intermediate link arm;the first linkage arm forms a head end of the linkage assembly, one end of the first linkage arm is hinged to the lateral hinge point, and the other end of the first linkage arm is hinged to one end of the second linkage arm. The other end of the second linkage is hinged to one end of the third linkage, and the second linkage arm is also hinged to the seat frame, thereby forming a four-bar linkage together with the seat frame, the rear footrest swing arm, the first linkage arm, and the second linkage arm. The other end of the third linkage is hinged to the inner linkage assembly, and the third linkage arm forms a rear end of the linkage assembly.; [4] The extendable furniture frame according to claim 3, wherein the footrest device further comprises a front footrest connecting arm, a rear footrest connecting arm, a second intermediate connecting arm, a first long connecting arm, and a second long connecting arm extended in the front-rear direction along the base frame; an upper end of the rear footrest connecting arm is connected to a rear end of the first long connecting arm, and a lower end of the rear footrest connecting arm is connected to the first lower hinge point of the first long connecting arm;A lower end of the front footrest link arm is pivotally connected to the front footrest swing arm, and an upper end of the front footrest link arm is sequentially pivotally connected to the rear end of the second long link arm and the rear end of the first long link arm. The second intermediate link arm is pivotally connected to both the rear footrest link arm and the front footrest swing arm. A front end of the first long link arm is pivotally connected to a first footrest head with a support portion, and a position of the first footrest head remote from the first long link arm is pivotally connected to a second footrest head with a support portion. The second footrest head is pivotally connected to a short arm, and a front end of the second long link arm is sequentially pivotally connected to the first footrest head and the short arm.When switched to the retracted position, the support parts of both the first and second footrest heads are arranged in a forward-downward arrangement, and the first and second long connecting arms are retracted into the seat frame; when the footrest device is switched to the extended position, the support parts of the first and second footrest heads are arranged upward, and the first and second long connecting arms slide and protrude beyond the seat frame. [5] An extendable furniture frame according to claim 4, wherein an arcuate elongated hole is provided at the rear end of the first long connecting arm, and a limiting projection positioned within the arcuate elongated hole is provided on the rear footrest connecting arm, the limiting projection abutting a hole wall at one end of the arcuate elongated hole when the footrest device is switched to the retracted position and abutting a hole wall at the other end of the arcuate elongated hole when the footrest is switched to the extended position; the swing arm of the front footrest is provided with a second upper hinge point, a second lower hinge point, and a lowest hinge point below the second lower hinge point;The seat frame is hinged to the second upper hinge point, and both the front footrest connecting arm and the first middle connecting arm are hinged to the second lower hinge point; the rear footrest connecting arm and the first intermediate connecting arm are hinged to the first lower hinge point; the rear footrest connecting arm is also provided with a rear intermediate hinge point and a first upper hinge point hinged to the rear end of the first long connecting arm; the second intermediate connecting arm is respectively hinged to the lowest hinge point and the rear intermediate hinge point, and the rear intermediate hinge point is located between the first lower hinge point of the front footrest connecting arm and the first upper hinge point of the rear footrest connecting arm;the front footrest connecting arm is further provided with a front intermediate hinge point and a front upper hinge point, the rear end of the second long connecting arm is hinged to the front intermediate hinge point of the front footrest connecting arm, and the first long connecting arm is hinged to the front upper hinge point of the front footrest connecting arm; [6] The extendable furniture frame according to claim 4, wherein the first footrest head is provided with a first hinge point hinged to the front end of the first long connecting arm, a second hinge point hinged to the front end of the second long connecting arm, and a third hinge point hinged to the second footrest head; the second hinge point is adjacent to the first hinge point, and the front end of the second long connecting arm is provided with a fourth hinge point in front of the second hinge point;the second footrest head is provided with a fifth hinge point located between the third hinge point and the support portion of the second footrest head, and the short arm is hinged to the fourth hinge point and the fifth hinge point, respectively, wherein a distance from the second hinge point to the third hinge point is D1, a distance from the third hinge point to the fifth hinge point is D2, a distance from the fifth hinge point to the fourth hinge point is D3, a distance from the fourth hinge point to the second hinge point is D4, and D1 > D3 > D4 > D2.; [7] An extendable frame for furniture according to claim 1, wherein the backrest adjustment device comprises a rear backrest swing arm, a front backrest swing arm and a backrest rotating frame for adjusting an angle of the backrest, the rear backrest swing arm is provided with a first hinge point hinged to the rear end of the seat frame, a second hinge point hinged to the rotatable frame of the backrest and a third hinge point hinged to the backrest actuating assembly, the third hinge point being arranged below the second hinge point;the front backrest swing arm is provided with a fourth hinge point which is hinged at the rear end of the seat frame and a fifth hinge point. The fifth hinge point is positioned above the fourth hinge point and in front of the second hinge point, while the fourth hinge point is positioned in front of the first hinge point; The backrest control assembly includes a first control link arm, a second control link arm, and a third control link arm. A head end of the first control link arm is hinged to the rear end of the base frame to form a first hinge centerline, and a rear end of the first control link arm is hinged to a head end of the second operating link arm to form a second hinge centerline; a rear end of the second operating link arm is hinged to a head end of the third operating link arm to form a third hinge centerline; the second operating link arm is further hinged to the rear end of the seat frame to form a fourth hinge centerline, and the rear end of the third control link arm is hinged to the third hinge point. where a distance from the center line of the first joint to the center line of the second joint is P1, a distance from the center line of the second joint to the center line of the fourth joint is P2, a distance from the center line of the fourth joint to the center line of the third joint is P3, a distance from the center line of the third joint to the third hinge point is P4, the distance from the second hinge point to the first hinge point is P5, the distance from the fourth hinge point to the fifth hinge point is P6, the distance from the first hinge point to the fourth hinge point is P7, the distance from the second hinge point to the fifth hinge point is P8, and P2 > P1 > P7 > P5 > P6 > P8 > P3 > P4. [8] An extendable furniture frame according to claim 2, further comprising a first telescopic actuator and a second telescopic actuator, each comprising an operating body and a telescopic body that telescopically slides on the operating body, wherein one of the operating bodies and the telescopic body of the first telescopic actuator is pivotally connected to the rear end of the seat frame, and the other part of the actuator body and the telescopic body of the first telescopic actuator is pivotally connected to the front footrest swing arm or the rear footrest swing arm; the other part of the actuator body and the telescopic body of the second telescopic actuator is pivotally connected to the rear end of the base frame, and the other part of the actuator body and the telescopic body of the second telescopic actuator is pivotally connected to the outer link arm assembly. [9] An extendable frame for furniture according to claim 8, wherein each of the base frame, the seat frame, the backrest adjustment device, the backrest control assembly, the footrest device, the linkage assembly, and the seat frame control assembly is arranged in a pair, and each pair is arranged in the left-right direction; a first fixed rod is fixed between the rear ends of the base frame pair, and a second fixed rod is fixed between the pair of outer link arm assemblies, a third fixed rod is fixed between the rear ends of the seat frame pair, and a fourth fixed rod is fixed between the pair of rear footrest swing arms;the telescopic body of the first telescopic drive is articulated to the fourth fixed rod, the actuating body of the first telescopic drive is articulated to the third fixed rod, the telescopic body of the second telescopic drive is articulated to the second fixed rod, and the actuating body of the second telescopic drive is articulated to the first fixed rod; [10] A sofa comprising a backrest and a seat cushion, and the extendable frame for furniture according to any one of claims 1 to 9, wherein the backrest is mounted on the backrest adjustment device and the seat cushion is mounted on the seat frame.

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