Stretchable framework for furniture and sofa with framework

Abstract

The utility model discloses a stretching framework for furniture. The stretching framework comprises a base frame, a cushion frame, a backrest adjusting mechanism, a footrest mechanism, a cushion frame control assembly, a linkage assembly and a backrest control assembly. The head end of the linkage assembly is hinged to the footrest mechanism, and the tail end of the linkage assembly is hinged to the cushion frame control assembly. The backrest control assembly is hinged to the rear end of the base frame, the rear end of the cushion frame and the backrest adjusting mechanism. In the process of switching from the retraction position to the extension position, the foot rest mechanism is linked with the seat cushion frame control assembly through the linkage assembly, so that the seat cushion frame and the backrest adjusting mechanism are switched from the initial position to the preset middle position together; in the process that the backrest adjusting mechanism is switched to the ending position from the preset middle position along with the seat cushion frame, the backrest control assembly controls the backrest adjusting mechanism to conduct angle adjustment. Therefore, the stretching framework for the furniture is suitable for occasions without leaning against the wall. In addition, the utility model further discloses a sofa.

Description

Technical Field

[0001] The utility model relates to a piece of furniture, in particular to an extendable frame for furniture and a sofa with the frame. 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 sofas are one of the many material consumer goods.

[0003] At present, for the floor-standing sofa series with adjustable armrests, an extending iron frame is installed inside. The extending 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 series of mechanical connecting rods, thereby realizing the sofa to switch between sitting, leisure and full lying positions to meet people's usage needs.

[0004] However, in existing extendable iron frames, the footrest directly drives the backrest mechanism and the backrest to adjust their angle backward during the extension process. This backward adjustment of the backrest occupies the rearward space of the sofa, preventing the back of the sofa from being in close contact with the wall and thus failing to achieve the desired zero wall contact. When the back of the sofa is in close contact with the wall, the backrest mechanism directly collides with the wall during the extension process of the footrest, causing the backrest mechanism to fail to adjust its angle and the footrest to fail to extend.

[0005] In addition, in the existing footrest device of the extendable iron frame, since the rear end of its first long link is directly hinged to the lower end of the rear swing arm, and the rear end of the second long link is directly hinged to the lower end of the front swing arm, and the upper ends of the front swing arm and the rear swing arm are respectively hinged to the seat cushion frame, this will cause the footrest device to occupy a large amount of space on the seat cushion frame in the upper and lower directions during the extension and retraction (i.e. extension and retraction) process.

[0006] Therefore, there is an urgent need for a furniture extendable frame and a sofa having the frame to overcome one or more of the above-mentioned defects. Utility Model Content

[0007] One object of the present invention is to provide an extendable frame for furniture, wherein when the footrest mechanism is extended, the seat cushion frame and the backrest adjustment mechanism thereon slide forward to a preset position relative to the base frame through the cooperation of the linkage assembly and the seat cushion frame control assembly. Only then does the backrest control assembly link the backrest adjustment mechanism to adjust the angle, so that the angle adjustment of the backrest adjustment mechanism is performed away from the wall, thereby being suitable for occasions where there is no wall.

[0008] Another object of the present invention is to provide a sofa in which, when the footrest mechanism is extended, the seat cushion frame and the backrest adjustment mechanism thereon slide forward to a preset position relative to the base frame through the cooperation of the linkage assembly and the seat cushion frame control assembly. Only then does the backrest control assembly link the backrest adjustment mechanism to adjust the angle, so that the angle adjustment of the backrest adjustment mechanism is performed away from the wall, thereby being adaptable to occasions where there is no wall contact.

[0009] In order to achieve the above-mentioned purpose, the furniture extension frame of the present invention comprises a base frame, a seat cushion frame, a footrest mechanism, a seat cushion frame control assembly, a linkage assembly, a backrest control assembly and a backrest adjustment mechanism. The seat cushion frame can move relative to the base frame in the front-to-back direction of the base frame and has at least an initial position, a preset intermediate position and an end position. The backrest adjustment 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 be switched between at least a retracted position and an extended position. The seat cushion frame control assembly is assembled between the seat cushion frame and the base frame to control the front-to-back movement of the seat cushion frame relative to the base frame. The head end of the linkage assembly is hinged to the footrest mechanism, and the tail end of the linkage assembly is hinged to the seat cushion frame control assembly. The backrest control assembly is hinged to the rear end of the base frame, the rear end of the seat cushion frame and the backrest adjustment mechanism respectively, and the backrest control assembly is driven to move by the seat cushion frame. In the process of switching from the retracted position to the extended position, the footrest mechanism links the seat cushion frame control component through the linkage component so that the seat cushion frame and the backrest adjustment mechanism switch from the initial position to the preset middle position; in the process of the backrest adjustment mechanism following the seat cushion frame to switch from the preset middle position to the end position, the backrest control component controls the backrest adjustment mechanism to adjust the angle.

[0010] Compared with the prior art, with the help of a linkage assembly whose head end is hinged to the footrest mechanism and whose tail end is hinged to the seat cushion frame control assembly, and a back control assembly which is respectively hinged to the rear end of the base frame, the rear end of the seat cushion frame and the backrest adjustment mechanism and is driven to move by the seat cushion frame, during 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 assembly to control the seat cushion frame and the backrest adjustment mechanism to switch from the initial position to the preset middle position together; when the seat cushion frame and the backrest adjustment mechanism switch to the preset middle position together, the backrest control assembly controls the backrest adjustment mechanism to adjust the angle; since the angle adjustment of the backrest adjustment mechanism is performed only when the backrest adjustment mechanism switches to the preset middle position relative to the base frame together with the seat cushion frame, position avoidance is provided for the angle adjustment of the backrest adjustment mechanism, so that the extension frame of the furniture of the present invention is suitable for occasions where there is no wall support.

[0011] 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 adjustment mechanism, and the seat cushion is mounted on the seat cushion frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a plan view of the sofa of the present invention when it is in a sitting position and viewed from right to left along the seat cushion 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.

[0013] Figure 2 This is a plan view of the sofa of the present invention when it is in a leisure position and viewed from right to left along the seat cushion 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.

[0014] Figure 3 This is a plan view of the sofa of the present invention when it is in a fully reclining state and viewed from right to left along the seat cushion 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.

[0015] Figure 4 The utility model is a furniture extension frame Figure 1 Floor plan of the condition shown.

[0016] Figure 5 yes Figure 4 A perspective view of the state shown.

[0017] Figure 6 yes Figure 4 A plan view after hiding the seat cushion frame, seat cushion frame control assembly, linkage assembly, base frame, backrest adjustment mechanism, backrest control assembly, first telescopic drive, second telescopic drive, first fixing rod, second fixing rod, third fixing rod and fourth fixing rod on the right side.

[0018] Figure 7 The utility model is a furniture extension frame Figure 2 Floor plan of the condition shown.

[0019] Figure 8 yes Figure 7 A perspective view of the state shown.

[0020] Figure 9 yes Figure 7 A plan view after hiding the seat cushion frame, seat cushion frame control assembly, linkage assembly, base frame, backrest adjustment mechanism, backrest control assembly, first telescopic drive, second telescopic drive, first fixing rod, second fixing rod, third fixing rod and fourth fixing rod on the right side.

[0021] Figure 10The utility model is a furniture extension frame Figure 3 Floor plan of the condition shown.

[0022] Figure 11 yes Figure 10 A perspective view of the state shown.

[0023] Figure 12 yes Figure 10 A plan view after hiding the seat cushion frame, seat cushion frame control assembly, linkage assembly, base frame, backrest adjustment mechanism, backrest control assembly, first telescopic drive, second telescopic drive, first fixing rod, second fixing rod, third fixing rod and fourth fixing rod on the right side.

[0024] Figure 13 yes Figure 12 Stereoscopic image.

[0025] Figure 14 yes Figure 13 3D exploded view of .

[0026] Figure 15 yes Figure 13 A stereogram from another angle.

[0027] Figure 16 yes Figure 15 3D exploded view of .

[0028] Figure 17 A perspective view showing the assembled base frame, seat frame, seat frame control assembly, backrest adjustment mechanism, backrest control assembly, linkage assembly and footrest rear swing arm on the left side.

[0029] Figure 18 yes Figure 17 3D exploded view of .

[0030] Figure 19 yes Figure 18 A three-dimensional exploded view from another angle. DETAILED DESCRIPTION

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

[0032] See also Figures 1 to 3 The sofa 1000 of the present invention comprises an extendable frame 100 for furniture, a backrest 200 and a seat cushion 300. The backrest 200 is assembled on a backrest adjustment mechanism 70 described below, and the seat cushion 300 is mounted on a seat cushion frame 20 described below; so that the sofa 1000 of the present invention can be adjusted in the following manner. Figure 1 The sitting posture shown, Figure 2 The leisure posture shown and Figure 3The user can switch between the three lying positions to better meet the needs of the user. Figures 1 to 3 As an example, the sofa 1000 of the present invention further includes guards 400 located on the left and right sides of the backrest 200 and the seat cushion 300, a foot pad 500 mounted on the footrest mechanism 30 described below, and a front baffle 600 arranged at the front and lower part of the furniture extension frame 100; the front baffle 600 is fixedly connected to the guards 400 on the left and right sides, the furniture extension frame 100 is located between the guards 400 on the left and right sides, the base frame 10 described below in the furniture extension frame 100 is fixedly connected to the guards 400, and the guards 400 provide an assembly location and support for the furniture extension frame 100. It should be noted that although Figures 1 to 3 The sofa 1000 of the present invention further includes a body guard 400 located on the left and right sides of the backrest 200 and the seat cushion 300, a foot pad 500 assembled on the footrest mechanism 30, and a front baffle 600 arranged at the front and lower part of the furniture extension frame 100, but is not limited thereto.

[0033] Recombination Figure 5 、 Figure 8 and Figure 11 The furniture extension frame 100 includes a base frame 10, a cushion frame 20, a footrest mechanism 30, and a cushion frame control assembly 40 (see Figure 7 ), linkage assembly 50, backrest control assembly 60 (see Figure 4 ) and backrest adjustment mechanism 70. The seat cushion frame 20 can move relative to the base frame 10 in the front-rear direction of the base frame 10 so that the seat cushion frame 20 has at least an initial position relative to the base frame 10 (see Figures 4 to 6 ), preset middle position (see Figures 7 to 9 ) and end position (see Figures 10 to 12 ).

[0034] The backrest adjustment mechanism 70 is mounted on the rear end 21 of the seat cushion frame 20. The rear end 21 of the seat cushion frame 20 provides support and a mounting location for the backrest adjustment mechanism 70, and can move forward and backward relative to the base frame 10 along with the seat cushion frame 20. The footrest mechanism 30 is mounted on the front end 22 of the seat cushion frame 20. The footrest mechanism 30 can be at least in the retracted position (see Figure 1 and Figures 4 to 6 shown) and extended position (see Figure 2 and Figures 7 to 10The seat cushion frame control assembly 40 is mounted between the seat cushion frame 20 and the base frame 10. The seat cushion frame control assembly 40 is used to control the forward and backward movement of the seat cushion frame 20 relative to the base frame 10. The head end 51 of the linkage assembly 50 is hinged to the footrest mechanism 30, and the tail end 52 of the linkage assembly 50 is hinged to the seat cushion frame control assembly 40 to meet the need for the footrest mechanism 30 to be linked to the seat cushion frame control assembly 40 through the linkage assembly 50. 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 adjustment mechanism 70 respectively. The backrest control assembly 60 is also driven to move by the seat cushion frame 20, that is, during the movement of the seat cushion frame 20, it drives the backrest control assembly 60 to move relative to the base frame 10.

[0035] Therefore, in the process of switching from the retracted position to the extended position, the footrest mechanism 30 links the seat frame control assembly 40 through the linkage assembly 50 so that the seat frame 20 and the backrest adjustment mechanism 70 are moved together. Figure 1 The initial position shown is Figure 2 The preset intermediate position shown is switched; the backrest adjustment mechanism 70 follows the seat cushion frame 20 by Figure 2 The preset intermediate position shown switches to Figure 3 During the process of reaching the end position shown, the backrest control assembly 60 controls the backrest adjustment mechanism 70 to adjust the angle, thereby achieving the required angle adjustment of the backrest 200 mounted on the backrest adjustment mechanism 70. It should be noted that when the sofa 1000 of the present invention switches from a sitting position to a fully reclining position, when the footrest mechanism 30 switches from a retracted position to an extended position, the linkage assembly 50 correspondingly links the seat cushion frame control assembly 40 to switch the seat cushion frame 20 from an initial position to a preset intermediate position, thereby placing the sofa 1000 in a lounge position. When the sofa 1000 is in the lounge position, the process of continuing to switch the seat cushion frame 20 from the preset intermediate position to the end position will cause the backrest control assembly 60 to control (link) the movement of the backrest adjustment mechanism 70, thereby achieving the purpose of the backrest 200 following the backrest adjustment mechanism 70 in adjusting its angle, thereby achieving the purpose of switching the sofa 1000 from the lounge position to the fully reclining position. More specifically, as follows:

[0036] like Figures 5 to 9 As shown, as an example, the footrest mechanism 30 includes a front footrest swing rod 31, a rear footrest swing rod 32, a first intermediate link 33, a front footrest link 34, a rear footrest link 35, a second intermediate link 36, and a first long link 37 and a second long link 38 extending in the front-rear direction of the base frame 10. Optionally, Figure 6 and Figure 9As an example, the first long link 37 is longer than the second long link 38, and the first long link 37 and the second long link 38 are also arranged side by side in the left and right directions of the seat cushion frame 20, so that the first long link 37 is between the seat cushion frame 20 and the second long link 38. Figure 8 shown.

[0037] At the same time, the first intermediate link 33 is located below the seat frame 20 and extends in the front and rear direction of the base frame 10. The front swing arm 31 of the footrest is hinged to the seat frame 20 and the front end of the first intermediate link 33. Figure 10 The footrest rear swing rod 32 is hinged to the seat cushion frame 20 and the rear end of the first intermediate link 33. Figure 15 As shown. The upper end of the footrest rear link 35 is hinged to the rear end 371 of the first long link 37, and the lower end of the footrest rear link 35 is hinged to the footrest rear swing link 32 (specifically, the rear swing lower hinge position 323 described below). The lower end of the footrest front link 34 is hinged to the footrest front swing link 31, and the upper end of the footrest front link 34 is hinged to the rear end 381 of the second long link 38 and the rear end 371 of the first long link 37 in sequence. The second intermediate link 36 is hinged to both the footrest rear link 35 and the footrest front swing link 31. Figure 12 As shown, the speed at which the second intermediate link 36 and the rear footrest link 35 cooperate to drive the first long link 37 is greater than the speed at which the front footrest link 34 drives the second long link 38, thereby satisfying the need to generate a speed difference between the first long link 37 and the second long link 38.

[0038] Furthermore, the front end 372 of the first long connecting rod 37 is hinged with a first footrest 39a with a supporting portion 391, the first footrest 39a is hinged with a second footrest 39b with a supporting portion 392 at a position away from the first long connecting rod 37, the second footrest 39b is hinged with a short rod 39c, and the front end 382 of the second long connecting rod 38 is hinged with the first footrest 39a and the short rod 39c in sequence. Figure 6 、 Figure 9 、 Figure 12 and Figure 13As an example, the first footrest head 39a is provided with a first hinge position 393 hinged to the front end 372 of the first long connecting rod 37, a second hinge position 394 hinged to the front end 382 of the second long connecting rod 38, and a third hinge position 395 hinged to the second footrest head 39b, the second hinge position 394 is adjacent to the first hinge position 393, the front end 382 of the second long connecting rod 38 is provided with a fourth hinge position 383 located in front of the second hinge position 394, and the second footrest head 39b is provided with a supporting portion located at the third hinge position 395 and the second footrest head 39b. The fifth hinge position 396 between the second hinge position 394 and the third hinge position 395 is hinged to the short rod 39c, and the short rod 39c is hinged to the fourth hinge position 383 and the fifth hinge position 396 respectively. Optionally, as an example, the distance from the second hinge position 394 to the third hinge position 395 is D1, the distance from the third hinge position 395 to the fifth hinge position 396 is D2, the distance from the fifth hinge position 396 to the fourth hinge position 383 is D3, and the distance from the fourth hinge position 383 to the second hinge position 394 is D4, wherein D1>D3>D4>D2. The purpose of this design is: when the footrest mechanism 30 switches to Figure 4 When the footrest 39a is in the retracted position shown, 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 4 As shown; when the footrest mechanism 30 switches to Figure 7 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 7 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.

[0039] Combine Figure 6 and Figure 9 As an example, an arc-shaped long hole 373 is opened on the rear end 371 of the first long connecting rod 37, and a limiting protrusion 353 is provided on the rear connecting rod 35 of the footrest, which is placed in the arc-shaped long hole 373. When the footrest mechanism 30 is switched to the retracted position, the limiting protrusion 353 abuts against the hole wall 3731' at one end of the arc-shaped long hole 373. Figure 6The limiting projection 53 abuts against the hole wall 3731 of the other end of the arc-shaped long hole 373 when the footrest mechanism 30 is switched to the extended position, and the state is shown Figure 9 The purpose of this design is to effectively prevent the footrest mechanism 30 from over-extension or over-retraction.

[0040] like Figures 8 to 12 As shown, as an example, the footrest front swing link 31 is provided with a front upper hinge 311, a front lower hinge 312, and a lower hinge 313 located below the front lower hinge 312. The seat frame 20 is hinged to the front upper hinge 311, and the footrest front link 34 and the first intermediate link 33 are both hinged to the front lower hinge 312. By means of the front lower hinge 312, the footrest front link 34, the first intermediate link 33, and the footrest front swing link 31 are coaxially hinged. The footrest rear swing link 32 is provided with a rear upper hinge 321 hinged to the seat frame 20, a side hinge 322 located to the front and side of the rear upper hinge 321, and a rear lower hinge 323 hinged to the rear end of the first intermediate link 33. The rear lower hinged position 323 is also hinged to the rear footrest link 35, so as to achieve the purpose of coaxial hinged connection of the rear footrest link 35, the first intermediate link 33 and the rear footrest swing rod 32 with the help of the rear lower hinged position 323.

[0041] Another example Figures 8 to 12 As shown, as an example, the footrest rear link 35 is provided with a rear intermediate hinge position 354 and a rear upper hinge position 355 hinged to the rear end 371 of the first long link 37, the second intermediate link 36 is hinged to the lower hinge position 313 and the rear intermediate hinge position 354 respectively, and the rear intermediate hinge position 354 is located between the rear lower hinge position 323 of the footrest rear swing link 32 and the rear upper hinge position 355 of the footrest rear link 35. Optionally, as an example, the lower end of the footrest rear link 35 is a rearward bending structure bent backward. The rear intermediate hinge position 354 of the rear footrest link 35 is located at the bending position of the rear bending structure. This design better meets the requirement that the first long link 37 is driven by the four-link structure composed of the seat cushion frame 20, the front footrest swing rod 31, the rear footrest swing rod 32 and the first intermediate link 33 to slide at a speed greater than the speed at which the second long link 38 is driven by the four-link structure, thereby meeting the purpose of the first long link 37 being able to slide relative to the second long link 38; in addition, the aforementioned arc-shaped long hole 373 is arranged around the rear upper hinge position 355.

[0042] For example Figures 8 to 12As shown, as an example, the front footrest link 34 is further provided with a front middle hinge position 343 and a front upper hinge position 344, the rear end 382 of the second long link 38 is hinged to the front middle hinge position 343 of the front footrest link 34, and the first long link 37 is hinged to the front upper hinge position 344 of the front footrest link 34. Optionally, as an example, the upper end of the front footrest link 34 is a front bent structure bent backward, and the front middle hinge position 343 of the front footrest link 34 is hinged to the front middle hinge position 343 of the front footrest link 34. 3 is located at the bending portion of the front bending structure. This design can meet the need for compact fit between the first long link 37 and the second long link 38, and can more reliably meet the need for the first long link 37 to slide relative to the second long link 38 along the front-to-back direction of the base frame 10 during the switching process of the footrest mechanism 30 between the extended position and the retracted position, thereby meeting the need for the first long link 37 to drive the supporting portion 391 of the first footrest head 39a to flip between forward and upward.

[0043] Combine Figure 6 and Figure 9 , the working principle of the footrest mechanism 30 is explained: when Figure 6 The footrest mechanism 30 is switched to the retracted position shown. Figure 9 When in the extended position shown, the front footrest swing link 31 and the rear footrest swing link 32 are pivoted counterclockwise upward around the front upper hinge 311 and the rear footrest swing link 32 are pivoted around the rear upper hinge 321, thereby driving the first intermediate link 33 to move upward, while also driving the front footrest link 34 to swing clockwise forward around the rear lower hinge 312, driving the rear footrest link 35 to swing clockwise forward around the rear lower hinge 323, and driving the second intermediate link 36 to rotate clockwise forward, thereby driving the first long link 37 and the second long link 38 to slide forward, and making the sliding speed of the first long link 37 greater than the speed of the second long link 38; precisely 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 are rotated counterclockwise upward. When the front swing rod 31 of the footrest swings around the front hinge 311 and the rear swing rod 32 of the footrest swings around the rear hinge 321, they swing counterclockwise upward to Figure 9 When the position shown in FIG. 1 is reached, the supporting portion 391 of the first footrest 39a and the supporting portion 392 of the second footrest 39b are switched to the upwardly arranged position. Figure 9 It should be noted that, since the process of switching the footrest mechanism 30 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 described in detail here.

[0044] Among them, in the footrest mechanism 30, by means of "the footrest front swing rod 31 is hinged to the seat cushion frame 20 and the front end of the first intermediate link 33, the footrest rear swing rod 32 is hinged to the seat cushion frame 20 and the rear end of the first intermediate link 33, the upper end of the footrest rear link 35 is hinged to the rear end 371 of the first long link 37, the lower end of the footrest rear link 35 is hinged to the footrest rear swing rod 32, the lower end of the footrest front link 34 is hinged to the footrest front swing rod 31, the upper end of the footrest front link 34 is hinged to the rear end 381 of the second long link 38 and the rear end 371 of the first long link 37 in sequence, the second intermediate link 36 is hinged to the footrest rear link On both the rod 35 and the front swing link 31 of the footrest, the front end 372 of the first long link 37 is hinged with a first footrest head 39a, the first footrest head 39a is hinged with a second footrest head 39b at a position away from the first long link 37, the second footrest head 39b is hinged with a short rod 39c, and the front end 382 of the second long link 38 is hinged with the first footrest head 39a and the short rod 39c in sequence. This design allows the first long link 37 and the second long link 38 to telescopically slide relative to the seat cushion frame 20 during the switching of the footrest mechanism 30 between the retracted position and the extended position, thereby reducing the space occupied by the seat cushion frame 20 in the upper and lower directions.

[0045] like Figures 4 to 19 As shown, as an example, the seat frame control assembly 40 includes an outer link assembly 41 that forms an outer four-bar linkage structure with the base frame 10, an inner link assembly 42 that forms an inner four-bar linkage structure with the seat frame 20, and a transmission assembly 43 that connects the outer link assembly 41 and the inner link assembly 42. At this time, the head end 51 of the linkage assembly 50 is hinged to the rear footrest swing link 32, and the tail end 52 of the linkage assembly 50 is hinged to the inner link assembly 42. The pivoting movement of the rear footrest swing link 32 is transmitted to the base frame 10 through the linkage assembly 50, the inner link assembly 42, the transmission assembly 43, and the outer link assembly 41. Therefore, the extension and retraction of the footrest mechanism 30 precedes the fore-and-aft movement of the seat frame 20. Specifically, as follows:

[0046] like Figures 17 to 19As shown, as an example, the inner link assembly 42 includes an inner front link 421, an inner intermediate link 422, and an inner rear link 423. The inner intermediate link 422 extends in the front-to-rear direction of the base frame 10 and is arranged below the seat cushion frame 20. The inner front link 421 and the inner rear link 423 are each hinged to both the seat cushion frame 20 and the inner intermediate link 422. 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-to-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 portion of the outer intermediate link 412 and the middle portion of the front transmission rod 431. Therefore, the inner link assembly 42, which forms an inner four-bar linkage structure with the seat cushion frame 20, and the outer link assembly 41, which forms an outer four-bar linkage structure with the base frame 10, are linked by the front transmission rod 431, the intermediate transmission rod 432, and the rear transmission rod 433, ensuring sequential operation of the inner and outer link assemblies 42 and 41.

[0047] like Figure 8 、 Figure 9 、 Figure 11 、 Figure 12 、 Figure 13 、 Figure 17 、 Figure 18 and Figure 19 As shown, as an example, the linkage assembly 50 includes a first linkage rod, a second linkage rod 53, and a third linkage rod. The first linkage rod forms the head end 51 of the linkage assembly 50, that is, reference numeral 51 is also the first linkage rod. One end of the first linkage rod 51 is hinged to the side hinge position 322, and the other end of the first linkage rod 51 is hinged to one end of the second linkage rod 53 to form a first hinge point 54. The other end of the second linkage rod 53 is hinged to one end of the third linkage rod to form a second hinge point 55. The second linkage rod 53 is also hinged to the seat cushion frame 20 at a position between the two ends to form a third hinge point 56. Together, the seat cushion frame 20, the rear footrest swing link 32, the first linkage rod 51, and the second linkage rod 53 form a four-link structure. The other end of the third connecting rod is hinged to the inner connecting rod assembly 42 described below (specifically, the inner rear connecting rod 423) to form a fourth hinge point 57. The third connecting rod forms the tail end 52 of the connecting assembly 50, that is, the label 52 is also the third connecting rod. The connecting assembly 50 is designed to include the first connecting rod 51, the second connecting rod 53 and the third connecting rod 52 to ensure that the extension and retraction of the footrest mechanism 30 and the movement of the seat cushion frame 20 relative to the base frame 10 are more coordinated.

[0048] like Figures 4 to 19 As shown in FIG. 1 , as an example, the backrest adjustment mechanism 70 includes a backrest rear swing rod 71, a backrest front swing rod 72, and a backrest rotating frame 73 for mounting 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 backrest control assembly 60. The third hinge position 713 is arranged below the second hinge position 712. Figures 6 and 7 As shown; the backrest front swing arm 72 is provided with 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, the fifth hinge position 722 is arranged above the fourth hinge position 721, the fifth hinge position 722 is also arranged in front of the second hinge position 712, and the fourth hinge position 721 is arranged in front of the first hinge position 711. Optionally, as an example, the distance from the second hinge position 712 to the first hinge position 711 is P5, the distance from the fourth hinge position 721 to the fifth hinge position 722 is P6, the distance from the first hinge position 711 to the fourth hinge position 721 is P7, and the distance from the second hinge position 712 to the fifth hinge position 722 is P8, wherein P7>P5>P6>P8. This design allows the seat cushion frame 20, the backrest rear swing rod 71, the backrest front swing rod 72 and the backrest rotating frame 73 to jointly form a trapezoidal four-bar structure, so that the backrest rotating frame 73 can rotate and adjust a larger angle under the drive of the backrest rear swing rod 71.

[0049] like Figure 4 、 Figure 6 、 Figure 7 、 Figure 9 、 Figure 10 and Figure 12As shown, as an example, the backrest control assembly 60 includes a first control link 61, a second control link 63, and a third control link 62. The head end of the first control link 61 is hinged to the rear end 11 of the base frame 10 to form a first hinge centerline C1, the tail end of the first control link 61 is hinged to the head end of the second control link 63 to form a second hinge centerline C2, the tail end of the second control link 63 is hinged to the head end of the third control link 62 to form a third hinge centerline C3, and the second control link 63 is also hinged to the rear end 21 of the seat cushion frame 20 at its head end and tail end to form a fourth hinge centerline C4. The tail end of the third control link 62 is hinged to the third hinge position 713. Among them, 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, and P2>P1>P7>P5>P6>P8>P3>P4; the purpose of this design is to effectively ensure that the backrest control component 60 moves forward relative to the base frame 10 to the position as shown in the figure when the seat cushion frame 20 moves forward together with the backrest adjustment mechanism 70 relative to the base frame 10. Figure 9 When the backrest is in the preset middle position, the backrest swing rod 71 is controlled (linked) to perform a pivoting action. Figures 1 to 3 It is known that the backrest 200 mounted on the backrest rotating frame 73 is rotated and adjusted relative to the seat cushion 300 mounted on the seat cushion frame 20 almost around the same axis during the adjustment process, so the user's clothes will not be stretched.

[0050] like Figure 5 、 Figure 8 and Figure 11 As shown, as an example, the furniture extension frame 100 further includes a first telescopic driver 80a and a second telescopic driver 80b. The first telescopic driver 80a includes a driver body 81 and a telescopic body 82 that telescopes and slides on the driver body 81. The driver body 81 of the first telescopic driver 80a is hinged to the rear end 21 of the seat cushion frame 20, and the telescopic body 82 of the first telescopic driver 80a is hinged to the rear footrest swing rod 32. The first telescopic driver 80a provides power for the extension and retraction of the footrest mechanism 30, and also provides power for the backrest adjustment mechanism 70 to follow the seat cushion frame 20 from the initial position to the preset intermediate position. Of course, according to actual needs, the telescopic body 82 of the first telescopic driver 80a can also be hinged to the front footrest swing rod 31, so it is not necessary to use the first telescopic driver 80a as the embodiment. Figure 5 、 Figure 8 and Figure 11 Limits shown.

[0051] Meanwhile, the second telescopic actuator 80b includes an actuator body 83 and a telescopic member 84 that telescopes and slides on the actuator body 83. The actuator body 83 of the second telescopic actuator 80b is hingedly connected to the rear end 11 of the base frame 10, and the telescopic member 84 of the second telescopic actuator 80b is hingedly connected to the outer link assembly 41 (specifically, the outer rear link 413). The second telescopic actuator 80b provides power for the backrest adjustment mechanism 70 to move from the preset intermediate position to the end position in response to the seat cushion frame 20, as well as for angular adjustment of the backrest adjustment mechanism 70.

[0052] Furthermore, the base frame 10, seat cushion frame 20, backrest adjustment mechanism 70, backrest control assembly 60, footrest mechanism 30, linkage assembly 50, and seat cushion frame control assembly 40 are arranged in a corresponding manner on the left and right sides of the base frame 10. A first fixing rod 91 is fixed between the rear end 11 of the base frame 10, a second fixing rod 92 is fixed between the outer link assemblies 41, a third fixing rod 93 is fixed between the rear end 21 of the seat cushion frame 20, and a fourth fixing rod 94 is fixed between the footrest rear swing link 32. The telescopic body 82 of the first telescopic actuator 80a is hingedly connected to the fourth fixing rod 94, the actuator body 82 of the first telescopic actuator 80a is hingedly connected to the third fixing rod 93, the telescopic body 84 of the second telescopic actuator 80b is hingedly connected to the second fixing rod 92, and the actuator body 83 of the second telescopic actuator 80b is hingedly connected to the first fixing rod 91.

[0053] In conjunction with the accompanying drawings, the process of adjusting the sofa 1000 of the present invention from a sitting position to a fully reclining position is described: Figure 1 The sofa 1000 in the sitting position shown is adjusted to Figure 2 In the leisure posture state shown, the first telescopic driver 80a is working, and the working first telescopic driver 80a drives the footrest mechanism 30 to stretch forward, and the stretched footrest mechanism 30 links the seat cushion frame 20 to move forward relative to the base frame 10 through the linkage assembly 50 and the seat cushion frame control assembly 40; because the backrest control assembly 60 is respectively hinged with the rear end 21 of the seat cushion frame 20, the rear end 11 of the base frame 10 and the backrest adjustment mechanism 70, and combined with Figure 4 and Figure 7 Therefore, the forward movement of the seat cushion frame 20 causes both the third control rod 62 and the first control rod 61 to pivot clockwise downward and the second control rod 63 to pivot counterclockwise downward.

[0054] When the first telescopic driver 80a drives the footrest mechanism 30 to stretch forward until it is fully in place, Figure 2 In the state shown, at this time, the telescopic body 84 of the second telescopic driving actuator 80b slides forward, so that the extended telescopic body 84 drives the seat cushion frame 20 together with the backrest adjustment mechanism 70 to move forward, and under the control of the backrest control component 60, combined with Figure 10 and Figure 12 , so that the backrest rear swing rod 71 and the backrest front swing rod 72 of the backrest adjustment mechanism 70 pivot downward in a clockwise direction, thereby driving the backrest rotating frame 73 to rotate downward in a counterclockwise direction, thereby achieving the purpose of adjusting the angle of the backrest rotating frame 73, as shown in the state Figure 3 and Figure 11 shown.

[0055] Compared with the prior art, the front end 51 of the linkage assembly 50 is hinged to the footrest mechanism 30 and the rear end 52 is hinged to the seat cushion frame control assembly 40, and 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 adjustment mechanism 70 respectively. Therefore, in the process of switching from the retracted position to the extended position, the footrest mechanism 30 links the seat cushion frame control assembly 40 through the linkage assembly 50, so that the seat cushion frame 20 and the backrest adjustment mechanism 70 are moved from the initial position to the extended position. Preset middle position switching; when the seat cushion frame 20 and the backrest adjustment mechanism 70 are switched to the preset middle position together, the backrest control component 60 controls the backrest adjustment mechanism 70 to adjust the angle; since the angle adjustment of the backrest adjustment mechanism 70 is only performed when the backrest adjustment mechanism 70 follows the seat cushion frame 20 and switches to the preset middle position relative to the base frame 10, a position avoidance is provided for the angle adjustment of the backrest adjustment mechanism 70, so that the sofa 1000 of the present invention is suitable for zero-wall-retention occasions. It should be noted that zero-wall-retention here means that the backrest 200 of the sofa 1000 can be attached to the wall, and the distance between them is zero; for example, Figures 1 to 3 In the figure, the vertical center line indicates the position of the wall. When the sofa 1000 is in a sitting position, the distance between the backrest 200 of the sofa 1000 and the vertical center line is zero. In the process of switching from a sitting position to a leisure position and a fully reclining position, the distance between the backrest 200 and the vertical center line becomes larger and larger. Therefore, the adjustment of the backrest 200 will not cause collision interference with the vertical center line.

[0056] It is worth noting that the direction indicated by the arrow A in the drawings is the direction from the back to the front of the base frame 10, the direction indicated by the arrow B in the drawings is the direction from the left to the right of the base frame 10, and the direction indicated by the arrow C in the drawings is the direction from the bottom to the top of the base frame 10. Figure 13 The rear end 11 of the base frame 10 is bent to form a first bent fixing portion 911 for fixedly connecting to the first fixing rod 91, the outer rear link 413 is bent to form a second bent fixing portion 921 for fixedly connecting to the second fixing rod 92, the rear end 21 of the seat cushion frame 20 is bent to form a third bent fixing portion 931 for fixedly connecting to the third fixing rod 93, and the rear footrest swing link 32 is bent to form a fourth bent fixing portion 941 for fixedly connecting to the fourth fixing rod 94. Figure 4 、 Figure 7 and Figure 10It is known that under the control of the seat cushion frame control assembly 40 , the seat cushion frame 20 also changes a certain angle relative to the base frame 10 during the forward movement, so that the forward and backward movement of the seat cushion frame 20 is a swing.

[0057] The above disclosure is only a preferred embodiment of the present invention, and its role is to facilitate the understanding and implementation of those skilled in the art. It is certainly not intended to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention still fall within the scope covered by the present invention.

Claims

1. An extendable frame for furniture, comprising a base frame, a seat frame that can move relative to the base frame in the front-to-back direction of the base frame and has at least an initial position, a preset intermediate position and a terminal position, a backrest adjustment mechanism mounted on the rear end of the seat frame, a footrest mechanism mounted on the front end of the seat frame and switchable between at least a retracted position and an extended position, and a seat frame control assembly mounted between the seat frame and the base frame to control the seat frame to move relative to the base frame front-to-back, characterized in that: The extendable frame for furniture also includes a linkage component and a backrest control component driven by the seat cushion frame, the head end of the linkage component is hinged to the footrest mechanism, and the tail end of the linkage component is hinged to the seat cushion frame control component; the backrest control component is respectively hinged to the rear end of the base frame, the rear end of the seat cushion frame and the backrest adjustment mechanism; wherein, in the process of switching from the retracted position to the extended position, the footrest mechanism links the seat cushion frame control component through the linkage component so that the seat cushion frame and the backrest adjustment mechanism move from the initial position to the preset middle position; in the process of the backrest adjustment mechanism following the seat cushion frame to switch from the preset middle position to the end position; the backrest control component controls the backrest adjustment mechanism to adjust the angle.

2. The furniture extension frame according to claim 1, characterized in that: The footrest mechanism includes a front footrest swing rod, a rear footrest swing rod and a first intermediate connecting rod located below the seat cushion frame and extending in the front-rear direction of the base frame, the front footrest swing rod is hinged to the seat cushion frame and the front end of the first intermediate connecting rod, and the rear footrest swing rod is hinged to the seat cushion frame and the rear end of the first intermediate connecting rod; the seat cushion frame control assembly includes an outer connecting rod assembly that together with the base frame forms an outer four-bar structure, an inner connecting rod assembly that together with the seat cushion frame forms an inner four-bar structure, and a transmission assembly that transmission connects the outer connecting rod assembly and the inner connecting rod assembly; the head end of the linkage assembly is hinged to the rear footrest swing rod, and the tail end of the linkage assembly is hinged to the inner connecting rod assembly.

3. The furniture extension frame according to claim 2, characterized in that: The linkage assembly includes a first linkage rod, a second linkage rod and a third linkage rod, the footrest rear swing rod is provided with a rear swing upper hinge position hinged to the seat cushion frame, a side hinge position arranged on the front side of the rear swing upper hinge position and a rear swing lower hinge position hinged to the rear end of the first intermediate link, the first linkage rod forms the head end of the linkage assembly, one end of the first linkage rod is hinged to the side hinge position, the other end of the first linkage rod is hinged to one end of the second linkage rod, the other end of the second linkage rod is hinged to one end of the third linkage rod, and the second linkage rod is also hinged to the seat cushion frame at a position between the two ends, so that the seat cushion frame, the footrest rear swing rod, the first linkage rod and the second linkage rod together form a four-link structure, the other end of the third linkage rod is hinged to the inner link assembly, and the third linkage rod forms the tail end of the linkage assembly.

4. The furniture extension frame according to claim 3, characterized in that: The footrest mechanism also includes 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, the lower end of the rear footrest link is hinged to the rear swing lower hinge position, the lower end of the front footrest link is hinged to the front footrest link, 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 link, and the front end of the first long link is hinged to a first footrest head with a supporting portion. A second footrest head with a supporting portion is hingedly connected to the first footrest head at a position away from the first long connecting rod, and a short rod is hingedly connected to the second footrest head, and a front end of the second long connecting rod is hingedly connected to the first footrest head and the short rod in sequence; when the footrest mechanism is switched to the retracted position, the supporting portions of the first footrest head and the second footrest head are arranged one in front and one below, and the first long connecting rod and the second long connecting rod slide and retract into the cushion frame; when the footrest mechanism is switched to the extended position, the supporting portions of the first footrest head and the second footrest head are arranged upwards, and the first long connecting rod and the second long connecting rod slide and extend out of the cushion frame.

5. The furniture extension frame according to claim 4, characterized in that: An arc-shaped long hole is provided on the rear end of the first long connecting rod, and a limiting protrusion placed in the arc-shaped long hole is provided on the rear connecting rod of the footrest, and the limiting protrusion abuts against the hole wall of one end of the arc-shaped long hole when the footrest mechanism is switched to the retracted position, and the limiting protrusion abuts against the hole wall of the other end of the arc-shaped long hole when the footrest mechanism is switched to the extended position; a front swing upper hinge position, a front swing lower hinge position and a lower hinge position located below the front swing lower hinge position are provided on the front swing rod of the footrest, the cushion frame is hinged to the front swing upper hinge position, and the front connecting rod of the footrest and the first intermediate connecting rod are both hinged to the front swing lower hinge position; the footrest The rear connecting rod and the first intermediate connecting rod are both hinged to the rear swing lower hinge; the footrest rear connecting rod is provided with a rear connecting intermediate hinge and a rear connecting upper hinge hinged to the rear end of the first long connecting rod, the second intermediate connecting rod is respectively hinged to the lower hinge and the rear connecting intermediate hinge, the rear connecting intermediate hinge is located between the rear swing lower hinge of the footrest rear swing rod and the rear connecting upper hinge of the footrest rear connecting rod; the footrest front connecting rod is also provided with a front connecting intermediate hinge and a front connecting upper hinge, the rear end of the second long connecting rod is hinged to the front connecting intermediate hinge of the footrest front connecting rod, and the first long connecting rod is hinged to the front connecting upper hinge of the footrest front connecting rod.

6. The furniture extension frame according to claim 4, characterized in that: The first footrest is provided with a first hinge position hinged to the front end of the first long connecting rod, a second hinge position hinged to the front end of the second long connecting rod and a third hinge position hinged to the second footrest, the second hinge position is adjacent to the first hinge position, the front end of the second long connecting rod is provided with a fourth hinge position located in front of the second hinge position, the second footrest is provided with a fifth hinge position located between the third hinge position and the supporting part of the second footrest, and the short rod is hinged to the fourth hinge position and the fifth hinge position respectively; wherein, the distance from the second hinge position to the third hinge position is D1, the distance from the third hinge position to the fifth hinge position is D2, the distance from the fifth hinge position to the fourth hinge position is D3, and the distance from the fourth hinge position to the second hinge position is D4, wherein, D1>D3>D4>D2.

7. The furniture extension frame according to claim 1, characterized in that: The backrest adjustment mechanism includes a backrest rear swing rod, a backrest front swing rod and a backrest rotating frame for the backrest assembly to rotate and adjust the backrest angle. The backrest rear swing rod is provided with a first hinge position hinged to the rear end of the seat cushion frame, a second hinge position hinged to the backrest rotating frame and a third hinge position hinged to the backrest control component. The third hinge position is arranged below corresponding to the second hinge position. The backrest front swing rod is provided with a fourth hinge position hinged to the rear end of the seat cushion frame and a fifth hinge position hinged to the backrest rotating frame. The fifth hinge position is arranged above corresponding to the fourth hinge position. The fifth hinge position is also arranged in front of the second hinge position. The fourth hinge position is arranged in front of the first hinge position. The backrest control component includes a first control link, a second control link and a third control link. The head end of the first control link is hinged to the rear end of the base frame to form a first hinge center line. The tail end of the first control link is hinged to the second control link The head end of the rod is hinged to form a second hinge center line, the tail end of the second control link is hinged to the head end of the third control link to form a third hinge center line, the second control link is also hinged to the rear end of the seat cushion frame at its head end and tail end to form a fourth hinge center line, the tail end of the third control link is hinged to the third hinge position; wherein, the distance from the first hinge center line to the second hinge center line is P1, and the distance from the second hinge center line to the fourth The distance between the hinge center lines is P2, the distance between the fourth hinge center line and the third hinge center line is P3, the distance between the third hinge center line and the third hinge position is P4, the distance between the second hinge position and the first hinge position is P5, the distance between the fourth hinge position and the fifth hinge position is P6, the distance between the first hinge position and the fourth hinge position is P7, and the distance between the second hinge position and the fifth hinge position is P8; wherein, P2>P1>P7>P5>P6>P8>P3>P4.

8. The furniture extension frame according to claim 2, characterized in that: It also includes a first telescopic drive and a second telescopic drive, each of the first telescopic drive and the second telescopic drive includes a drive body and a telescopic body that telescopes and slides on the drive body, one of the drive body and the telescopic body of the first telescopic drive is hinged to the rear end of the seat cushion frame, the other of the drive body and the telescopic body of the first telescopic drive is hinged to the front footrest swing rod or the rear footrest swing rod, one of the drive body and the telescopic body of the second telescopic drive is hinged to the rear end of the base frame, and the other of the drive body and the telescopic body of the second telescopic drive is hinged to the outer connecting rod assembly.

9. The furniture extension frame according to claim 8, characterized in that: The base frame, seat cushion frame, backrest adjustment mechanism, backrest control assembly, footrest mechanism, linkage assembly and seat cushion frame control assembly are respectively arranged in a left and right correspondence in the left and right directions of the base frame, a first fixing rod is fixed between the rear ends of the base frames, a second fixing rod is fixed between the outer connecting rod assemblies, a third fixing rod is fixed between the rear ends of the seat cushion frames, a fourth fixing rod is fixed between the rear swing rods of the footrests, the telescopic body of the first telescopic driver is hinged to the fourth fixing rod, the driver body of the first telescopic driver is hinged to the third fixing rod, the telescopic body of the second telescopic driver is hinged to the second fixing rod, and the driver body of the second telescopic driver is hinged to the first fixing rod.

10. A sofa, comprising a backrest and a seat cushion, characterized in that: The sofa further comprises an extendable frame for furniture according to any one of claims 1 to 9, the backrest is assembled on the backrest adjustment mechanism, and the seat cushion is mounted on the seat cushion frame.

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