Stretching mechanism for furniture and sofa with stretching mechanism

Abstract

The utility model discloses a stretching mechanism for furniture. The stretching mechanism comprises a base frame, a backrest adjusting device, a cushion frame and a backrest control assembly, wherein the cushion frame can move relative to the base frame in the front-back direction of the base frame, and the backrest control assembly is used for controlling a backrest rotating frame to be adjusted relative to the cushion frame. The backrest adjusting device comprises a backrest rear swing rod, a backrest front swing rod and a backrest rotating frame, and the backrest rear swing rod and the backrest front swing rod are hinged to the rear end of the cushion frame and the backrest rotating frame respectively. The backrest control assembly is hinged to the rear end of the base frame, the rear end of the cushion frame and the backrest rear swing rod or hinged to the rear end of the base frame, the rear end of the cushion frame and the backrest front swing rod. In the process that the cushion frame and the backrest adjusting device are switched from a preset middle position to a termination position, the backrest control assembly is linked with the backrest rear swing rod or the backrest front swing rod hinged to the backrest control assembly to swing in a pivoted mode, and therefore angle adjustment of the backrest rotating frame is achieved. And the device 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 extension mechanism for furniture and a sofa with the mechanism. Background Art

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

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

[0004] However, in the existing extendable iron frame, the footrest device directly drives the backrest mechanism to adjust the angle backwards during the extension process, and the backrest adjusted backwards will occupy the rear space of the sofa, so the back of the sofa cannot be in close contact with the wall and the purpose of zero contact with the wall cannot be achieved. 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 device, resulting in failure of the backrest mechanism angle adjustment and extension of the footrest device.

[0005] Therefore, there is an urgent need for a furniture extension mechanism and a sofa having the mechanism to overcome one or more of the above-mentioned defects. Utility Model Content

[0006] One object of the utility model is to provide an extension mechanism for furniture, so as to be suitable for occasions where the furniture is not close to a wall.

[0007] Another object of the utility model is to provide a sofa suitable for occasions where there is no need to lean against a wall.

[0008] To achieve the above-mentioned purpose, the furniture extension mechanism of the utility model comprises a base frame, a backrest adjustment device, a seat cushion frame that can move relative to the base frame in the front-rear direction of the base frame and has at least an initial position, a preset intermediate position and a terminal position, and a backrest control component that controls the backrest rotating frame to adjust the angle relative to the seat cushion frame during the movement of the seat cushion frame together with the backrest adjustment device relative to the base frame. The backrest adjustment device comprises 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, and the backrest rear swing rod and the backrest front swing rod are respectively hinged to the rear end of the seat cushion frame and the backrest rotating frame. 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 rear swing rod; or, 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 front swing rod; the backrest control component is driven to move by the seat cushion frame; in the process of the seat cushion frame together with the backrest adjustment device switching from the preset middle position to the end position, the backrest control component links the backrest rear swing rod or the backrest front swing rod hinged to the backrest control component to pivot, thereby realizing the angle adjustment of the backrest rotating frame.

[0009] Compared with the prior art, the backrest control component is driven by the seat cushion frame to move by means of "respectively hinged to the rear end of the base frame, the rear end of the seat cushion frame and the rear backrest swing rod, or respectively hinged to the rear end of the base frame, the rear end of the seat cushion frame and the front backrest swing rod"; therefore, in the process of the seat cushion frame together with the backrest adjustment device switching from the preset middle position to the end position, the backrest control component links the backrest rear swing rod or the backrest front swing rod hinged to the backrest control component to pivot, thereby realizing the angle adjustment of the backrest rotating frame; since the angle adjustment of the backrest rotating frame is carried out when the backrest adjustment device follows the seat cushion frame to switch from the preset middle position to the end position, position avoidance is provided for the angle adjustment of the backrest rotating frame, so that the furniture extension mechanism of the utility model is suitable for occasions where the backrest is not close to the wall.

[0010] Preferably, the backrest rear swing rod has 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 assembly, and the third hinge position is arranged below the second hinge position, and the backrest front swing rod has 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, and the fifth hinge position is arranged above the fourth hinge position, and the fifth hinge position is also arranged in front of the second hinge position, and the fourth hinge position is arranged in front of the first hinge position.

[0011] Preferably, the backrest control assembly 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 head end of the second control link 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, and the tail end of the third control link is hinged to the third hinge position. Among them, the distance from the first hinge center line to the second hinge center line is D1, the distance from the second hinge center line to the fourth hinge center line is D2, the distance from the fourth hinge center line to the third hinge center line is D3, the distance from the third hinge center line to the third hinge position is D4, the distance from the second hinge position to the first hinge position is D5, the distance from the fourth hinge position to the fifth hinge position is D6, the distance from the first hinge position to the fourth hinge position is D7, and the distance from the second hinge position to the fifth hinge position is D8; wherein, D2>D1>D7>D5>D6>D8>D3>D4.

[0012] Preferably, the furniture extension mechanism of the utility model further comprises a sitting linkage rod, a footrest device installed at the front end of the cushion frame, and a cushion frame control assembly installed between the cushion frame and the base frame to control the movement of the cushion frame relative to the base frame, the footrest device comprises a front footrest swing rod, a rear footrest swing rod and a footrest middle assembly, the head end of the front footrest swing rod is hinged to the front end of the cushion frame, the tail end of the front footrest swing rod is hinged to the footrest middle assembly, the head end of the rear footrest swing rod is hinged to the front end of the cushion frame The rear end of the footrest rear swing rod is hinged to the footrest middle assembly, the front end of the sitting rest linkage rod is hinged to the footrest front swing rod or the footrest rear swing rod, and the rear end of the sitting rest linkage rod is hinged to the seat cushion frame control assembly. By means of the forward pivoting of the front footrest swing rod and the rear footrest swing rod relative to the seat cushion frame, the footrest middle assembly is extended and flipped, and the seat cushion frame control assembly is controlled by the sitting rest linkage rod to swing forward and upward relative to the base frame.

[0013] Preferably, the hinge between the footrest rear swing rod and the seat cushion frame is located between the hinge between the seat rest linkage rod and the footrest rear swing rod and the hinge between the footrest rear swing rod and the footrest intermediate component.

[0014] Preferably, the cushion frame is in the preset middle position when the middle footrest assembly is extended and flipped into place.

[0015] Preferably, the extension mechanism for furniture of the utility model also includes a telescopic drive, which includes a drive body and a telescopic body that telescopically slides on the drive body, one of the drive body and the telescopic body is hinged to the rear end of the base frame, and the other of the drive body and the telescopic body is hinged to the rear swing rod of the footrest or the front swing rod of the footrest.

[0016] Preferably, the base frame, cushion frame, sitting linkage rod, footrest device and cushion frame control assembly are respectively arranged in left and right directions of the base frame in a corresponding manner, a rear fixed rod is fixed between the rear ends of the base frames, a front fixed rod is fixed between the front swing rods of the footrests, one of the drive body and the telescopic body is hinged to the rear fixed rod, and the other of the drive body and the telescopic body is hinged to the front fixed rod.

[0017] Preferably, the seat cushion frame control assembly includes an outer link assembly that together with the base frame forms an outer four-link structure, an inner link assembly that together with the seat cushion frame forms an inner four-link structure, and a transmission assembly that transmission connects the outer link assembly and the inner link assembly, and the rear end of the seat rest linkage rod is hinged to the inner link assembly.

[0018] To achieve the above-mentioned purpose, the sofa of the utility model comprises a backrest, a seat cushion and the aforementioned furniture extension mechanism, wherein the backrest is assembled on the backrest rotating frame, and the seat cushion is mounted on the seat cushion frame.

[0019] Compared with the prior art, the backrest control component is driven by the seat cushion frame to move by means of "being respectively hinged to the rear end of the base frame, the rear end of the seat cushion frame and the rear backrest swing rod, or being respectively hinged to the rear end of the base frame, the rear end of the seat cushion frame and the front backrest swing rod; therefore, when the seat cushion frame together with the backrest adjustment device moves forward to a preset middle position relative to the base frame, the backrest control component links the rear backrest swing rod or the front backrest swing rod hinged to the backrest control component to pivot, thereby realizing the angle adjustment of the backrest rotating frame; since the angle adjustment of the backrest rotating frame is performed only when the backrest adjustment device follows the seat cushion frame to move forward to the preset middle position relative to the base frame, a position avoidance is provided for the angle adjustment of the backrest rotating frame, so that the sofa of the utility model is suitable for occasions where there is no wall support. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The utility model is a plan view of a sofa with the furniture extension mechanism of the utility model in a sitting position when viewed from right to left, and the seat cushion frame is in an initial position at this time.

[0021] Figure 2 yes Figure 1 The sofa shown is in a state diagram of a position during the process of adjusting from a sitting position to a leisure position.

[0022] Figure 3 yes Figure 2 The sofa shown is in another state diagram while continuing to adjust toward the leisure posture state.

[0023] Figure 4 yes Figure 3 The sofa shown is adjusted to a leisure posture, with the seat cushion frame being in a preset middle position.

[0024] Figure 5 yes Figure 4 The sofa shown is adjusted to a fully reclining state, with the seat cushion frame being in the end position.

[0025] Figure 6 yes Figure 1 The sofa is shown in a three-dimensional view with the backrest and seat cushions hidden.

[0026] Figure 7 yes Figure 2 The sofa is shown in a three-dimensional view with the backrest and seat cushions hidden.

[0027] Figure 8 yes Figure 3 The sofa is shown in a three-dimensional view with the backrest and seat cushions hidden.

[0028] Fig. 9 yes Figure 4 The sofa is shown in a three-dimensional view with the backrest and seat cushions hidden.

[0029] Fig.10 yes Figure 5 The sofa is shown in a three-dimensional view with the backrest and seat cushions hidden.

[0030] Fig.11 yes Fig.10 A three-dimensional view after hiding the telescopic drive, rear fixing rod, front fixing rod and the right base frame, seat cushion frame, backrest adjustment device, backrest control assembly, footrest device, seat cushion frame control assembly and seat rest linkage rod.

[0031] Fig.12 yes Fig.11 3D exploded view of .

[0032] Fig.13 yes Fig.11 A stereogram from another angle.

[0033] Fig.14 yes Fig.13 3D exploded view of . DETAILED DESCRIPTION

[0034] The preferred embodiments of the present utility model are described below in conjunction with the accompanying drawings.

[0035] See also Figure 1 The sofa 1000 of the present invention comprises a furniture extension mechanism 100, a backrest 200 and a seat cushion 300. The backrest 200 is mounted on a backrest rotating frame 23 described below, and the seat cushion 300 is mounted on a seat cushion frame 30 described below, so that the sofa 1000 of the present invention can be switched to the following positions through the operation of the furniture extension mechanism 100. Figure 1 The sitting posture shown, Figure 4 The leisure posture shown or Figure 5 The fully reclining position shown can meet the needs of users.

[0036] Recombination Fig.11 and Fig.12 The furniture extension mechanism 100 comprises a base frame 10, a backrest adjustment device 20, a seat cushion frame 30 that can move relative to the base frame 10 in the front-rear direction of the base frame 10, and a backrest control component 40 that controls the backrest rotating frame 23 to adjust the angle relative to the seat cushion frame 30 when the seat cushion frame 30 and the backrest adjustment device 20 move relative to the base frame 10. Since the seat cushion frame 30 moves relative to the base frame 10, the seat cushion frame 30 has at least Figure 1 The initial position shown, Figure 4 The preset intermediate position shown and Figure 5 The backrest adjustment device 20 comprises a backrest rear swing rod 21, a backrest front swing rod 22 and the aforementioned backrest rotating frame 23. The backrest rotating frame 23 is provided for the backrest 200 to be assembled so that the backrest 200 can adjust its angle following the backrest rotating frame 23. The backrest rear swing rod 21 is hinged to both the rear end 31 of the seat cushion frame 30 and the backrest rotating frame 23. The backrest front swing rod 22 is hinged to both the rear end 31 of the seat cushion frame 30 and the backrest rotating frame 23. Optionally, Fig.11 As an example, the backrest rear swing rod 21, the backrest front swing rod 22, the backrest rotating frame 23 and the cushion frame 30 together form a four-link structure, so as to achieve the purpose of driving the backrest rotating frame 23 to rotate by means of the pivotal swing of the backrest rear swing rod 21 and the backrest front swing rod 22 relative to the cushion frame 30; since the backrest rear swing rod 21, the backrest front swing rod 22, the backrest rotating frame 23 and the cushion frame 30 together form a four-link structure, the backrest rotating frame 23 as a whole is equivalent to one connecting rod; obviously, according to actual needs, the backrest rear swing rod 21, the backrest front swing rod 22, the backrest rotating frame 23 and the cushion frame 30 can also be made to form a five-link structure together. At this time, the backrest rotating frame 23 as a whole is equivalent to two connecting rods hinged together, and so on. Fig.11 Limits shown.

[0037] At the same time, the backrest control assembly 40 is respectively hinged to the rear end 11 of the base frame 10, the rear end 31 of the seat cushion frame 30 and the backrest rear swing rod 21; obviously, according to actual needs, the backrest control assembly 40 can also be respectively hinged to the rear end 11 of the base frame 10, the rear end 31 of the seat cushion frame 30 and the backrest front swing rod 22, so it is not limited to the figures shown in the drawings; in addition, the backrest control assembly 40 is driven to move by the seat cushion frame 30, that is, during the movement of the seat cushion frame 30, the backrest control assembly 40 is also driven to move relative to the base frame 10.

[0038] Therefore, the seat cushion frame 30 together with the backrest adjustment device 20 is Figure 4 The preset intermediate position shown switches to Figure 5 During the process of reaching the terminal position shown in FIG. 1 , the backrest control assembly 40 links the backrest rear swing rod 21 to pivot, thereby achieving the angle adjustment of the backrest rotating frame 23. The adjusted state is shown in FIG. Figure 5 Specifically, combined with Figure 4 and Figure 5 The seat cushion frame 30 together with the backrest adjustment device 20 is Figure 4 The preset intermediate position shown switches to Figure 5 During the process of reaching the terminal position shown, the backrest control assembly 40 links the backrest rear swing rod 21 to pivot forward clockwise, and with the cooperation of the backrest front swing rod 22, the backrest rotating frame 23 is rotated backward counterclockwise. More specifically, as follows:

[0039] like Figures 1 to 5 and Figures 11 to 14 As shown, as an example, the backrest rear swing rod 21 has a first hinge position 211 hinged to the rear end 31 of the seat cushion frame 30, a second hinge position 212 hinged to the backrest rotating frame 23, and a third hinge position 213 hinged to the backrest control assembly 40, and the third hinge position 213 is arranged below the second hinge position 212. Figures 1 to 5As shown; the backrest front swing rod 22 has a fourth hinge position 221 hinged to the rear end 31 of the seat cushion frame 30 and a fifth hinge position 222 hinged to the backrest rotating frame 23, the fifth hinge position 222 is arranged above the fourth hinge position 221, the fifth hinge position 222 is also arranged in front of the second hinge position 212, and the fourth hinge position 221 is arranged in front of the first hinge position 211. Optionally, as an example, the distance from the second hinge position 212 to the first hinge position 211 is D5, the distance from the fourth hinge position 221 to the fifth hinge position 222 is D6, the distance from the first hinge position 211 to the fourth hinge position 221 is D7, and the distance from the second hinge position 212 to the fifth hinge position 222 is D8, wherein D7>D5>D6>D8. This design allows the seat cushion frame 30, the backrest rear swing rod 21, the backrest front swing rod 22 and the backrest rotating frame 23 to jointly form a trapezoidal four-bar structure, so that the backrest rotating frame 23 can rotate and adjust a larger angle driven by the backrest rear swing rod 21.

[0040] Another example Figures 1 to 5 and Figures 11 to 14 As shown, as an example, the backrest control assembly 40 includes a first control link 41, a second control link 43 and a third control link 42. The head end of the first control link 41 is hinged to the rear end 11 of the base frame 10 to form a first hinge center line C1, the tail end of the first control link 41 is hinged to the head end of the second control link 43 to form a second hinge center line C2, the tail end of the second control link 43 is hinged to the head end of the third control link 42 to form a third hinge center line C3, the second control link 43 is also hinged to the rear end 31 of the seat cushion frame 30 at its head end and tail end to form a fourth hinge center line C4, and the tail end of the third control link 42 is hinged to the third hinge position 213. Wherein, the distance from the first hinge center line C1 to the second hinge center line C2 is D1, the distance from the second hinge center line C2 to the fourth hinge center line C4 is D2, the distance from the fourth hinge center line C4 to the third hinge center line C3 is D3, the distance from the third hinge center line C3 to the third hinge position 213 is D4, and D2>D1>D7>D5>D6>D8>D3>D4; the purpose of such design is to effectively ensure that the backrest control assembly 40 moves forward relative to the base frame 10 together with the backrest adjustment device 20 to the position as shown in FIG. Figure 4 When the backrest is in the preset middle position, the backrest rear swing rod 21 is linked to perform a pivoting action. Figures 1 to 5 It is known that the backrest 200 mounted on the backrest rotating frame 23 is rotated and adjusted relative to the seat cushion 300 mounted on the seat cushion frame 30 almost around the same axis during the adjustment process, so the user's clothes will not be stretched.

[0041] like Figures 11 to 14As shown, as an example, the furniture extension mechanism 100 also includes a sitting linkage rod 50, a footrest device 60 installed on the front end 32 of the cushion frame 30, and a cushion frame control assembly 70 installed between the cushion frame 30 and the base frame 10 to control the movement of the cushion frame 30 relative to the base frame 10. The footrest device 60 includes a front footrest swing rod 61, a rear footrest swing rod 62, and a footrest middle assembly 63. The head end 611 of the front footrest swing rod 61 is hinged to the front end 32 of the cushion frame 30, and the tail end 612 of the front footrest swing rod 61 is hinged to the footrest middle assembly 63. The head end 621 of the rear footrest swing rod 62 is hinged to the front end 32 of the cushion frame 30, and the tail end 622 of the rear footrest swing rod 62 is hinged to the footrest middle assembly 63. The front end 51 of the sitting linkage rod 50 is hinged to the rear footrest swing rod 62, and the state is shown in FIG. Fig.11 As shown, it is obvious that according to actual needs, the front end 51 of the seat-rest linkage rod 50 can also be hinged with the front swing rod 61 of the footrest, so it is not necessary to Fig.11 As shown in the figure, the rear end 52 of the sitting linkage rod 50 is hinged to the cushion frame control assembly 70. Therefore, while the front footrest swing rod 61 and the rear footrest swing rod 62 are pivoted forward relative to the cushion frame 30 to make the middle footrest assembly 63 extend and flip, the cushion frame 30 is controlled to swing forward and upward relative to the base frame 10 by linking the cushion frame control assembly 70 through the sitting linkage rod 50. Therefore, under the action of the sitting linkage rod 50, the extension of the footrest device 60 and the front and rear movement of the cushion frame 30 are synchronized. Since the front and rear movement of the cushion frame 30 is linked by the extended footrest device 60 through the sitting linkage rod 50, power transmission needs to be carried out through the sitting linkage rod 50 and the cushion frame control assembly 70 in the middle, so that the front and rear movement of the cushion frame 30 is sequential relative to the extension of the footrest device 60. Specifically, as Figure 4 As shown in FIG. 1 , as an example, when the middle footrest component 63 is extended and turned into position, the seat cushion frame 30 is at a preset middle position, that is, the angle adjustment of the backrest rotating frame 23 is performed only when the middle footrest component 63 is extended and turned into position. Fig.11 and Fig.12 As an example, the hinge 623 between the footrest rear swing rod 62 and the cushion frame 30 is located between the hinge 53 between the sitting linkage rod 50 and the footrest rear swing rod 62 and the hinge 624 between the footrest rear swing rod 62 and the footrest intermediate component 63, so as to form a lever effect with the hinge 623 as a fulcrum, so that the extended footrest device 60 can more reliably link the sitting linkage rod 50 to move. It should be noted that since the specific structure of the footrest intermediate component 63 and the hinges with the footrest front swing rod 61 and the footrest rear swing rod 62 are well known in the art, they will not be described in detail here.

[0042] like Figures 6 to 10As shown, as an example, the furniture extension mechanism 100 further includes a telescopic driver 80, which includes a driver body 81 and a telescopic body 82 that telescopes and slides on the driver body 81. The driver body 81 is hinged to the rear end 11 of the base frame 10, and the telescopic body 82 is hinged to the front swing rod 61 of the footrest. Obviously, the telescopic body 82 can also be hinged to the rear swing rod 62 of the footrest to meet the need of the telescopic driver 80 driving the footrest device 60 to perform automatic extension and retraction movements. It should be noted that although Figures 6 to 10 In the figure, the driver body 81 is hinged to the rear end 11 of the base frame 10 and the telescopic body 82 is hinged to the front swing rod 61 of the footrest. However, according to actual needs, the driver body 81 can also be hinged to the front swing rod 61 of the footrest and the telescopic body 82 can be hinged to the rear end 11 of the base frame 10. Figures 6 to 10 Limits shown.

[0043] Another example Figures 6 to 10 As shown, as an example, the base frame 10, the cushion frame 30, the seat connecting rod 50, the footrest device 60 and the cushion frame control assembly 70 are respectively arranged in a left and right manner in a corresponding manner. A rear fixed rod 91 is fixed between the rear ends 11 of the base frame 10, and a front fixed rod 92 is fixed between the front footrest swing rods 61. The base frames 10 on the left and right sides are fixed together by the rear fixed rod 91, and the front footrest swing rods 61 in the footrest devices 60 on the left and right sides are fixed together by the front fixed rod 92. At this time, the driver body 81 is hinged to the rear fixed rod 91, and the telescopic body 82 is hinged to the front fixed rod 91, so as to ensure the uniformity of the force applied by the telescopic device 80 to the footrest devices 60 on the left and right sides. Specifically, at Figures 6 to 12 As an example, the rear end 11 of the base frame 10 is provided with a rear fixed connection portion 12 fixedly connected to the rear fixed rod 91, and the front swing rod 61 of the footrest is provided with a front fixed connection portion 613 fixedly connected to the front fixed rod 92. The rear fixed connection portion 12 and the front fixed connection portion 613 are both "L"-shaped bending structures to ensure the reliability of the fixed connection between the rear fixed rod 91 and the rear fixed connection portion 12, and the reliability of the fixed connection between the front fixed rod 92 and the front fixed connection portion 613. It should be noted that the telescopic drive 80 can be a cylinder, a liquid cylinder or an electric push rod, but this is well known in the art, so it will not be repeated here.

[0044] like Figures 11 to 14 As shown, as an example, the seat frame control assembly 70 includes an outer link assembly 71 that forms an outer four-link structure with the base frame 10, an inner link assembly 72 that forms an inner four-link structure with the seat frame 30, and a transmission assembly 73 that connects the outer link assembly 71 and the inner link assembly 72 in a transmission manner. The rear end 52 of the seat linkage rod 50 is hinged to the inner link assembly 72. Fig.11 and Fig.12Therefore, during the process of the footrest device 60 being extended and retracted, the power transmitted by the extended and retracted footrest device 60 needs to be transmitted to the base frame 10 through the seat rest linkage rod 50, the inner connecting rod assembly 72, the transmission assembly 73 and the outer connecting rod assembly 71, so the extension and retraction of the footrest device 60 precedes the forward and backward movement of the seat cushion frame 30. More specifically, as follows:

[0045] At Figures 11 to 14 As an example, the inner link assembly 72 includes an inner front link 721, an inner middle link 722 and an inner rear link 723. The inner middle link 722 extends along the front-rear direction of the base frame 10 and is arranged below the seat cushion frame 30. The inner front link 721 and the inner rear link 723 are respectively hinged to the seat cushion frame 30 and the inner middle link 722. Fig.11 and Fig.14 shown.

[0046] At Fig.13 and Fig.14 As shown, as an example, the outer link assembly 71 includes an outer front link 711, an outer middle link 712 and an outer rear link 713, the outer middle link 712 extends along the front-to-rear direction of the base frame 10 and is located above the base frame 10, and the outer front link 711 and the outer rear link 713 are respectively hinged to both the base frame 10 and the outer middle link 712.

[0047] At Fig.11 and Fig.12 As shown, as an example, the transmission assembly 73 includes a front transmission rod 731, an intermediate transmission rod 732 and a rear transmission rod 733, the front transmission rod 731 is hinged to both the inner intermediate link 722 and the outer front link 711, the rear transmission rod 733 is hinged to both the outer rear link 713 and the inner intermediate link 722, and the intermediate transmission rod 732 is hinged to both the middle part of the outer intermediate link 712 and the middle part of the rear transmission rod 733.

[0048] Therefore, the inner link assembly 72 that together with the seat cushion frame 30 constitutes an inner four-link structure and the outer link assembly 71 that together with the base frame 10 constitutes an outer four-link structure are linked through the front transmission rod 731, the middle transmission rod 732 and the rear transmission rod 733, thereby ensuring that the inner link assembly 72 and the outer link assembly 71 move sequentially.

[0049] Combination Figures 1 to 10 , the process of adjusting the sofa 1000 of the utility model from a sitting position to a full lying position is described: when it is necessary Figure 1 The sofa 1000 in the sitting position shown is adjusted to Figure 4In the leisure posture state shown, the telescopic drive 80 is working, and the working telescopic drive 80 drives the footrest device 60 to stretch forward, and the stretched footrest device 60 links the seat cushion frame 30 to move forward relative to the base frame 10 through the seat rest linkage rod 50 and the seat cushion frame control assembly 70; since the backrest control assembly 40 is respectively hinged to the rear end 31 of the seat cushion frame 30, the rear end 11 of the base frame 10 and the backrest rear swing rod 21, the forward movement of the seat cushion frame 30 causes the third control rod 42 and the first control rod 41 to pivot downward clockwise and the second control rod 43 to pivot downward counterclockwise.

[0050] When the telescopic driver 80 drives the footrest device 60 to stretch forward until it is fully in place, Figure 4 In the state shown, at this time, the telescopic body 82 of the telescopic driving actuator 80 continues to slide forward, so that the extended telescopic body 82 continues to drive the seat cushion frame 30 together with the backrest adjustment device 20 to move forward, and under the control of the backrest control component 40, the backrest rear swing rod 21 and the backrest front swing rod 22 of the backrest adjustment device 20 are pivoted downward clockwise, thereby driving the backrest rotating frame 23 to rotate downward counterclockwise, thereby achieving the purpose of adjusting the angle of the backrest rotating frame 23. Figure 5 As shown. Figure 2 and Figure 3 In the figure, it is a state diagram of the sofa 1000 in an intermediate position and another position during the process of adjusting to the leisure posture state.

[0051] Compared with the prior art, the backrest control assembly 40 driven by the seat cushion frame 30 is hinged to the rear end 11 of the base frame 10, the rear end 31 of the seat cushion frame 30 and the backrest rear swing rod 21, or hinged to the rear end 11 of the base frame 10, the rear end 31 of the seat cushion frame 30 and the backrest front swing rod 22; therefore, the seat cushion frame 30 together with the backrest adjustment device 20 is Figure 4 The preset intermediate position shown switches to Figure 5 During the process of the end position shown in the figure, the backrest control assembly 40 links the backrest rear swing rod 21 or the backrest front swing rod 22 hinged to the backrest control assembly 40 to pivot, thereby realizing the angle adjustment of the backrest rotating frame 23; since the angle adjustment of the backrest rotating frame 23 is performed when the backrest adjustment device 20 follows the seat cushion frame 30 to switch from the preset intermediate position to the end position, that is, the backrest control assembly 40 is in the process of the backrest adjustment device 20 following the seat cushion frame 30 to switch from the preset intermediate position to the end position. Figure 1 The initial position shown switches to Figure 3In the process of the preset intermediate position shown, the backrest rotating frame 23 is not linked to adjust the angle, so a position avoidance is provided for the angle adjustment of the backrest rotating frame 23, so that the sofa 1000 of the utility model is suitable for the occasion of zero wall contact. It should be noted that zero wall contact here means that the back of the sofa 1000 can be attached to the wall, and the distance between them is zero; for example, Figures 1 to 5 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 sofa 1000 and the vertical center line is zero. In the process of the sofa 1000 switching from the sitting position to the leisure position and the full lying position, the distance between the back adjustment device 20 and the vertical center line becomes larger and larger. Therefore, the adjustment of the back adjustment device 20 will not cause collision interference with the vertical center line.

[0052] It is worth noting that the direction indicated by arrow A in the drawings is the direction from the back to the front of the base frame 10, and the direction indicated by arrow B in the drawings is the direction from the left to the right of the base frame 10. Figures 1 to 5 It is known that, under the control of the seat cushion frame control assembly 70 , the seat cushion frame 30 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 30 is a swing.

[0053] The above disclosure is only a preferred example of the present invention, and its role is to facilitate the technical personnel in this field to understand and implement it. Of course, it cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention still fall within the scope covered by the present invention.

Claims

1. A furniture extension mechanism, comprising a base frame, a backrest adjustment device and a seat cushion frame that can move relative to the base frame in the front-rear direction of the base frame and has at least an initial position, a preset intermediate position and a terminal position, the backrest adjustment device comprising 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 and the backrest front swing rod are respectively hinged to the rear end of the seat cushion frame and the backrest rotating frame, characterized in that: The furniture extension mechanism also includes a backrest control component for controlling the backrest rotating frame to adjust the angle relative to the seat cushion frame during the process in which the seat cushion frame together with the backrest adjustment device moves relative to the base frame, the backrest control component is hinged to the rear end of the base frame, the rear end of the seat cushion frame and the backrest rear swing rod respectively; or, the backrest control component is hinged to the rear end of the base frame, the rear end of the seat cushion frame and the backrest front swing rod respectively; the backrest control component is driven to move by the seat cushion frame; during the process in which the seat cushion frame together with the backrest adjustment device switches from the preset middle position to the end position, the backrest control component links the backrest rear swing rod or the backrest front swing rod hinged to the backrest control component to pivot, thereby realizing the angle adjustment of the backrest rotating frame.

2. The furniture extension mechanism according to claim 1, characterized in that: The backrest rear swing rod has 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 assembly, the third hinge position is arranged below the second hinge position, the backrest front swing rod has a fourth hinge position hinged to the rear end of the seat cushion frame and a fifth hinge position hinged to the backrest rotating frame, the fifth hinge position is arranged above the fourth hinge position, the fifth hinge position is also arranged in front of the second hinge position, and the fourth hinge position is arranged in front of the first hinge position.

3. The furniture extension mechanism according to claim 2, characterized in that: The backrest control assembly 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 head end of the second control link 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, and the tail end of the third control link is hinged to the third hinge position; wherein, the first The distance from the first hinge center line to the second hinge center line is D1, the distance from the second hinge center line to the fourth hinge center line is D2, the distance from the fourth hinge center line to the third hinge center line is D3, the distance from the third hinge center line to the third hinge position is D4, the distance from the second hinge position to the first hinge position is D5, the distance from the fourth hinge position to the fifth hinge position is D6, the distance from the first hinge position to the fourth hinge position is D7, and the distance from the second hinge position to the fifth hinge position is D8; wherein, D2>D1>D7>D5>D6>D8>D3>D4.

4. The furniture extension mechanism according to claim 1, characterized in that: The pedal assembly further comprises a seat-rest linkage rod, a footrest device mounted on the front end of the seat cushion frame, and a seat cushion frame control assembly mounted between the seat cushion frame and the base frame to control the seat cushion frame to move relative to the base frame. The footrest device comprises a front footrest swing rod, a rear footrest swing rod, and a footrest intermediate assembly. The head end of the front footrest swing rod is hinged to the front end of the seat cushion frame, the tail end of the front footrest swing rod is hinged to the footrest intermediate assembly, the head end of the rear footrest swing rod is hinged to the front end of the seat cushion frame, and the footrest The tail end of the rear swing rod is hinged to the middle footrest assembly, the front end of the sitting linkage rod is hinged to the front footrest swing rod or the rear footrest swing rod, and the rear end of the sitting linkage rod is hinged to the seat cushion frame control assembly. By means of the forward pivoting of the front footrest swing rod and the rear footrest swing rod relative to the seat cushion frame, the middle footrest assembly is extended and flipped, and the seat cushion frame control assembly is linked to the sitting linkage rod to control the seat cushion frame to swing forward and upward relative to the base frame.

5. The furniture extension mechanism according to claim 4, characterized in that: The hinged part between the rear footrest swing rod and the cushion frame is located between the hinged part between the seat rest linkage rod and the rear footrest swing rod and the hinged part between the rear footrest swing rod and the middle footrest component.

6. The furniture extension mechanism according to claim 4, characterized in that: The cushion frame is in the preset middle position when the footrest middle component is extended and flipped into position.

7. The furniture extension mechanism according to claim 4, characterized in that: It also includes a telescopic drive, which includes a drive body and a telescopic body that performs telescopic sliding on the drive body, one of the drive body and the telescopic body is hinged to the rear end of the base frame, and the other of the drive body and the telescopic body is hinged to the rear swing rod of the footrest or the front swing rod of the footrest.

8. The furniture extension mechanism according to claim 7, characterized in that: The base frame, cushion frame, sitting linkage rod, footrest device and cushion frame control assembly are respectively arranged in left and right directions of the base frame in a corresponding manner, a rear fixed rod is fixed between the rear ends of the base frames, a front fixed rod is fixed between the front swing rods of the footrests, one of the driver body and the telescopic body is hinged to the rear fixed rod, and the other of the driver body and the telescopic body is hinged to the front fixed rod.

9. The furniture extension mechanism according to claim 4, characterized in that: The seat cushion frame control assembly includes an outer link assembly that together with the base frame forms an outer four-link structure, an inner link assembly that together with the seat cushion frame forms an inner four-link structure, and a transmission assembly that connects the outer link assembly and the inner link assembly in a transmission manner, and the rear end of the seat rest linkage rod is hinged to the inner link assembly.

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

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