Linkage and sofa seat having the same

Abstract

The application provides a linkage device and a sofa seat with the same, and the linkage device comprises a first supporting assembly, a second supporting assembly and a first limiting component; the first supporting assembly is movably arranged; the second supporting assembly is hinged to the first supporting assembly and is foldably arranged to drive the first supporting assembly to move; the first limiting component is arranged on the second supporting assembly and close to one end of the first supporting assembly, and the first limiting component is used for blocking the first supporting assembly so that the first supporting assembly is in a first predetermined position; or the first limiting component is arranged on the first supporting assembly and close to one end of the second supporting assembly, and the first limiting component is used for blocking the second supporting assembly so that the second supporting assembly is in a second predetermined position. The application solves the problem of unstable movement of the multifunctional sofa seat in the process of posture conversion in the prior art.

Description

Technical Field

[0001] This invention relates to the field of furniture technology, and more specifically, to a linkage device and a sofa chair having the same. Background Technology

[0002] Currently, in order to meet the various needs of users, modern sofas have a wide variety of functions. Multifunctional sofas combine motion ergonomics and planar rod kinematics in their design to make the sofa more comfortable and achieve a smooth transition from sitting to leisure posture, meeting various needs such as sitting, relaxing or sleeping.

[0003] However, existing multi-functional sofas and chairs are not smooth when transitioning between various postures, which can cause shaking or noise, seriously affecting the user's comfort and experience. Summary of the Invention

[0004] The main objective of this invention is to provide a linkage device and a sofa chair having the same, so as to solve the problem of unstable movement of multifunctional sofa chairs in the prior art during various posture transitions.

[0005] To achieve the above objectives, according to one aspect of the present invention, a linkage device is provided, comprising: a first support component, the first support component being movably disposed; a second support component, hinged to the first support component, the second support component being foldable to drive the first support component to move; and a first limiting member disposed on the second support component near one end of the first support component, the first limiting member blocking the first support component to place the first support component in a first predetermined position; or the first limiting member disposed on one end of the first support component near the second support component, the first limiting member blocking the second support component to place the second support component in a second predetermined position.

[0006] Furthermore, the linkage device also includes a drive component, which is connected to the second support component. The second support component includes a second link, the two ends of which are respectively connected to the first support component and the drive component. The drive component drives the first support component to move through the second link, and a first limiting component is disposed on the second link.

[0007] Furthermore, the second support assembly also includes: a support plate, which has a second mounting end face and a second free end face opposite to the second mounting end face; a third link, the two ends of which are respectively hinged to the end of the support plate and the first support assembly; and a fourth link, the two ends of which are respectively hinged to the middle of the second link and the middle of the third link.

[0008] Furthermore, the first support assembly includes a first link, which has a first mounting end face and a first free end disposed opposite to each other; along the direction from the first mounting end face to the first free end, the first link has a first hinge point and a second hinge point, a third link is hinged at the first hinge point, and a second link is hinged at the second hinge point; the second link, the third link, the fourth link and the first link together form a first link mechanism.

[0009] Furthermore, the linkage device also includes: a third support component; and a drive component, the two ends of which are respectively connected to the drive component and the second support component. The drive component drives the third support component to move, so that the third support component drives the second support component to move.

[0010] Furthermore, the third support assembly includes: a fifth link, the two ends of which are hinged to the drive assembly and the second support assembly respectively; and a sixth link, the two ends of which are connected to the second support assembly and the drive assembly respectively; wherein the fifth link and the sixth link are hinged to each other.

[0011] Furthermore, the sixth link includes a first link segment and a second link segment that are hinged to each other; the first link segment includes a connecting segment that is hinged to the second support assembly, the second link segment is connected to the drive assembly, and the body of the fifth link is hinged to the second link segment; the fifth link is also provided with a second limiting component, which stops the sixth link so that the sixth link is in a third predetermined position.

[0012] Furthermore, the linkage device also includes: a third support assembly; a first support assembly including a first connecting rod; a second support assembly including a support plate, a second connecting rod, a third connecting rod, and a fourth connecting rod; a third support assembly including a sixth connecting rod; a sixth connecting rod including a first rod segment; one end of the third connecting rod is hinged to the first connecting rod, and the other end is hinged to the support plate; one end of the second connecting rod is hinged to the first connecting rod, and the other end is connected to the support plate through the first rod segment; one end of the fourth connecting rod is hinged to the third connecting rod, and the other end is hinged to the second connecting rod; the second connecting rod, the third connecting rod, the fourth connecting rod, the support plate, and the first rod segment together form a second linkage mechanism.

[0013] Furthermore, the linkage device also includes: a seventh link and a mounting frame; the seventh link is hinged to the fifth link at one end away from the second support assembly, and its other end is hinged to the mounting frame; the second link segment at one end away from the first link segment is hinged to the mounting frame; the vertical distance H1 between the mounting frame and the ground is 208mm to 450mm.

[0014] Furthermore, the linkage device includes a retracted state and an extended state; the first support component includes a first mounting end face; the second support component includes a second mounting end face; when the linkage device is in the retracted state, the first mounting end face and the second mounting end face are approximately parallel.

[0015] Furthermore, when the linkage device is in the state, the vertical distance a between the first mounting end face and the second mounting end face is 15mm to 50mm; when the linkage device is in the extended state, the maximum distance L between the end of the first mounting end face and the end of the second mounting end face is 310mm to 410mm.

[0016] According to another aspect of the present invention, a sofa seat is provided, including a linkage device and a seat body, wherein the linkage device is mounted on the seat body and the linkage device is the linkage device described above.

[0017] Applying the technical solution of this invention, the linkage device is used to drive the first shelf and the second shelf to move. The linkage device includes a first support component, a second support component, and a first limiting component. The first support component is connected to the first shelf and is movably positioned, driving the first shelf to extend or retract. The second support component is hinged to the first support component, and the second shelf is disposed on the second support component. The second support component is foldable, allowing simultaneous movement of the first support component and the second shelf. The first limiting component is disposed on the second support component near one end of the first support component, blocking the first support component to a first predetermined position; or the first limiting component is disposed on the first support component near one end of the second support component, blocking the second support component to a second predetermined position. The first support component supports the first shelf, and the second support component supports the second shelf. The second support component is hinged to the first support component, so that the first shelf and the second shelf can move simultaneously when the second support component moves. By setting a first limiting component on the second support component, the first support component can be stopped and supported when the first support component rotates to the first predetermined position, thereby improving the stability of the linkage device. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0019] Figure 1 A schematic diagram of the extended state of an embodiment of the linkage device according to the present invention is shown;

[0020] Figure 2 A schematic diagram of the retracted state of an embodiment of the linkage device according to the present invention is shown;

[0021] Figure 3 A side view of an embodiment of the linkage device according to the present invention is shown;

[0022] Figure 4 A schematic diagram of the drive assembly of the linkage device according to the present invention is shown.

[0023] The above figures include the following reference numerals:

[0024] 100, First shelf; 200, Second shelf; 1, First support assembly; 11, First connecting rod; 110, First mounting end face; 111, First free end; 101, First hinge point; 102, Second hinge point;

[0025] 2. Second support assembly; 20. Support plate; 21. Second connecting rod; 22. Third connecting rod; 23. Fourth connecting rod; 201. Second mounting end face; 202. Second free end face; 203. Third hinge point; 204. Fourth hinge point; 205. Fifth hinge point; 206. Sixth hinge point;

[0026] 3. First limiting component; 4. Third support assembly; 5. Drive assembly; 51. First support rod; 52. Second support rod; 53. Telescopic component; 40. Fifth link; 41. Sixth link; 410. First rod segment; 4101. Connecting segment; 411. Second rod segment; 6. Second limiting component; 7. Seventh link;

[0027] 300. Mounting plate; 301. Mounting frame. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms “comprising” and / or “including” are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof; the term “connection” indicates a direct or indirect connection in a physical sense.

[0030] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0031] Please refer to Figures 1 to 3 This invention provides a linkage device for moving a first shelf 100 and a second shelf 200. The linkage device includes: a first support component 1 connected to the first shelf 100, the first support component 1 being movably positioned, and the first support component 1 causing the first shelf 100 to extend or retract; a second support component 2 hinged to the first support component 1, the second support component 2 being foldable, so as to move the first support component 1 through the second support component 2; a first limiting component 3 disposed on the second support component 2 near one end of the first support component 1, the first limiting component 3 blocking the first support component 1 to place the first support component 1 in a first predetermined position; and the first limiting component 3 disposed on the first support component 1 near one end of the second support component 2, the first limiting component 3 blocking the second support component 2 to place the second support component 2 in a second predetermined position.

[0032] According to the linkage device provided by the present invention, a first shelf 100 and a second shelf 200 are moved. The linkage device includes a first support component 1, a second support component 2, and a first limiting component 3. The first support component 1 is connected to the first shelf 100 and is movably positioned. The first support component 1 drives the first shelf 100 to extend or retract. The second support component 2 is hinged to the first support component 1. The second shelf 200 is disposed on the second support component 2 and is foldable, so that the first support component 1 and the second shelf 200 can be moved simultaneously through the second support component 2. The first limiting component 3 is disposed on the second support component 2 near one end of the first support component 1, and blocks the first support component 1 to place the first support component 1 in a first predetermined position. The first limiting component 3 is also disposed on the first support component 1 near one end of the second support component 2, and blocks the second support component 2 to place the second support component 2 in a second predetermined position. The first support component 1 supports the first shelf 100, and the second support component 2 supports the second shelf 200. The second support component 2 is hinged to the first support component 1. As the second support component 2 moves, the first shelf 100 and the second shelf 200 can move simultaneously. By setting a first limiting component 3 on the first support component 1 or the second support component 2, the first supporting component 3 can stop and support the first support component 1 when it rotates to the first predetermined position, or stop and support the second support component 2 when it rotates to the second predetermined position, thereby improving the stability of the linkage device.

[0033] In this application, the linkage device has a retracted state ( Figure 2 and Figure 4 ) and extended state ( Figure 1 and Figure 3 The first predetermined position is the unfolded position in which the first support component 1 puts the linkage device in an extended state, and the second predetermined position is the unfolded position in which the second support component 2 puts the linkage device in an extended state.

[0034] Specifically, the linkage device further includes a drive assembly 5, which is connected to the second support assembly 2. The second support assembly 2 includes a second connecting rod 21, with both ends of the second connecting rod 21 connected to the first support assembly 1 and the drive assembly 5, respectively. The drive assembly 5 drives the first support assembly 1 to move via the second connecting rod 21. A first limiting member 3 is disposed on the second connecting rod 21. The first support assembly 1 rotates relative to the second connecting rod 21. When the first support assembly 1 rotates to a first predetermined position, it contacts the first limiting member 3, which stops the first support assembly 1, keeping it in the first predetermined position. Preferably, the first limiting member 3 is a protrusion or a limiting pin, and it protrudes from the surface of the second connecting rod 21.

[0035] In specific implementation, in order to ensure that the first support assembly 1 rotates smoothly, the second support assembly 2 further includes: a support plate 20, which includes a second mounting end face 201 and a second free end face 202 opposite to the second mounting end face 201; a third connecting rod 22, the two ends of which are hinged to the support plate 20 and the first support assembly 1 respectively; and a fourth connecting rod 23, the two ends of which are hinged to the second connecting rod 21 and the third connecting rod 22 respectively.

[0036] Specifically, such as Figure 1 As shown, the first support assembly 1 includes a first connecting rod 11, which has a first mounting end face 110 for mounting the first shelf 100 and a first free end 111 opposite to the first mounting end face 110. Along the direction from the first mounting end face 110 to the first free end 111, the first connecting rod 11 has a first hinge point 101 and a second hinge point 102. A third connecting rod 22 is hinged to the first hinge point 101, and a second connecting rod 21 is hinged to the second hinge point 102. The second connecting rod 21 and the third connecting rod 22 jointly support the first connecting rod 11, ensuring stability during rotation of the first connecting rod 11.

[0037] Thus, the second link 21, the third link 22, the fourth link 23, and the first link 11 form a first linkage mechanism. During the rotation of the second link 21 and the third link 22, the first link 11 is simultaneously moved, thereby moving the first support assembly 1 so that the first shelf 100 is in a supporting position or a storage position. The linkage mechanism in this application is a lower pair mechanism.

[0038] The support plate 20 is provided with a second mounting end face 201 for mounting the second shelf 200 and a second free end face 202 opposite to the second mounting end face 201. Along the direction from the second mounting end face 201 to the second free end face 202, the end of the support plate 20 is provided with a third hinge point 203, located near the end of the second mounting end face 201. The third connecting rod 22 is hinged to the third hinge point 203. The second connecting rod 21 has a fourth hinge point 204, and the third connecting rod 22 has a sixth hinge point 206. One end of the fourth connecting rod 23 is hinged to the fourth hinge point 204, and the other end is hinged to the sixth hinge point 206. This arrangement hinges the third connecting rod 22 to the support plate 20 and the fourth connecting rod 23 to the second connecting rod 21. During the rotation of the second connecting rod 21, the fourth connecting rod 23 can simultaneously drive the third connecting rod 22 to rotate.

[0039] In the embodiments provided by the present invention, the linkage device further includes: a third support component 4; and a drive component 5. The two ends of the third support component 4 are respectively connected to the drive component 5 and the second support component 2. The drive component 5 drives the third support component 4 to move, thereby causing the third support component 4 to move the second support component 2. Through the linkage mechanism formed by the third support component 4, the second support component 2, and the first support component 1, when the drive component 5 drives the third support component 4 to rotate, the third support component 4 simultaneously drives the second support component 2 and the first support component 1 to rotate, so that the first shelf 100 and the second shelf 200 are simultaneously in a supporting position or a storage position. Specifically, the third support component 4 includes: a fifth link 40, the two ends of which are respectively connected to the drive component 5 and the second support component 2; and a sixth link 41, the two ends of which are respectively hinged to the second support component 2 and the drive component 5; wherein the fifth link 40 and the sixth link 41 are hinged together. In this configuration, the end of the sixth link 41 furthest from the drive assembly 5 is hinged to both the second link 21 and the support plate 20. The support plate 20 also has a fifth hinge point 205. The end of the sixth link 41 is hinged to the second link 21, and the body of the sixth link 41 is hinged at the fifth hinge point 205. Thus, when the sixth link 41 rotates around the fifth hinge point 205, it can drive the second link 21 to rotate, thereby driving the first link 11 to rotate. Preferably, the third hinge point 203 and the fifth hinge point 205 are sequentially arranged from the second mounting end face 201 to the second free end face 202 of the support plate 20.

[0040] In specific implementation, the sixth link 41 includes a first link segment 410 and a second link segment 411 that are hinged to each other. The first link segment 410 includes a connecting segment 4101, which is hinged to the second support assembly 2. Thus, when the sixth link 41 rotates around the fifth hinge point 205, the first link segment 410 drives the connecting segment 4101 to rotate, the connecting segment 4101 drives the second link 21 to rotate, and in turn drives the first link 11 to rotate. The second link segment 411 is connected to the drive assembly 5, and the body of the fifth link 40 is hinged to the second link segment 411.

[0041] In this way, the second linkage 21, the third linkage 22, the fourth linkage 23, the support plate 20 and the first link segment 410 form a second linkage mechanism. During the rotation of the first link segment 410, the second support component 2 is moved at the same time, which in turn drives the first support component 1 to rotate, so that the first shelf 100 is in the supporting position or the storage position.

[0042] The linkage device further includes a second limiting component 6, disposed on the fifth link 40, which stops the sixth link 41 to be in a third predetermined position. Preferably, the second limiting component 6 is a protrusion or a limiting pin, which stops the sixth link 41 relative to the second segment 411 of the sixth link 41, thereby keeping the sixth link 41 in a position where the first shelf 100 is open or retracted.

[0043] Specifically, the linkage device also includes a seventh link 7 and a mounting frame 301. The seventh link 7 is hinged to the end of the fifth link 40 away from the second support assembly 2, and its other end is hinged to the mounting frame 301. The end of the second link segment 411 away from the first link segment 410 is hinged to the mounting frame 301. The seventh link 7 is hinged to the end of the fifth link 40 away from the support plate 20, and the end of the sixth link 41 away from the support plate 20 is hinged to the mounting frame 301. The mounting frame 301 is inclined relative to the horizontal plane.

[0044] like Figure 4As shown, the drive assembly 5 includes a first support rod 51 and a second support rod 52. The first support rod 51 is connected to the second segment 411 of the sixth connecting rod 41, and the second support rod 52 is connected to the first support rod 51 and the second support rod 52 via a telescopic member 53. The telescopic member 53 is telescopically configured so that when the telescopic member 53 extends, the first support rod 51 pushes the sixth connecting rod 41 to rotate, thereby applying a pushing force sequentially to the second support assembly 2 and the first support assembly 1 until the rod body of the second segment 411 contacts the second limiting member 6. The second limiting member 6 then stops the first support assembly 1 and the second support assembly 2, placing them in a predetermined extended position. The telescopic member 53 can be a lead screw, driven by a motor, and the lead screw passes through a sleeve; alternatively, the telescopic member 53 can be a drive cylinder, where the piston rod of the drive cylinder pushes the first support rod 51 to move the second segment 411. In practical applications, such as... Figure 1 The diagram shows the linkage device in the extended position, meaning both the first shelf 100 and the second shelf 200 are in the supporting position. The maximum distance L from the end of the second shelf 200 to the end of the first shelf 100 is 310mm to 410mm. Figure 2 The diagram shows the linkage device in the retracted position, i.e., the first shelf 100 and the second shelf 200 are in the stowed position. The fifth link 40 has a seventh link 7 hinged to its end furthest from the support plate 20. The end of the seventh link 7 and the end of the second link segment 411 are both hinged to the mounting frame 301. The linkage device also includes a mounting plate 300 for mounting the seat frame of the sofa. When the first shelf 100 and the second shelf 200 are in the stowed position, the vertical distance H1 between the mounting frame 301 and the ground is 208mm to 450mm, and the vertical distance H2 between the second shelf 200 and the ground is 20mm. The first support component 1 includes a first mounting end face 110; the second support component 2 includes a second mounting end face 201; when the linkage device is in the retracted state, the first mounting end face 110 and the second mounting end face 201 are approximately parallel; the maximum horizontal distance a between the first mounting end face 110 and the second mounting end face 201 is 15mm to 50mm; furthermore, the supporting end face of the first shelf 100 and the supporting end face of the second shelf 200 are parallel to each other, so as to minimize the space occupied by the first shelf 100 and the second shelf 200 when they are in the storage position, and to make the sofa and chair look more beautiful.

[0045] In a preferred embodiment of this application, when the linkage device is in the retracted state, the first mounting end face 110 and the second mounting end face 201 are parallel to each other, and the vertical distance a between the first mounting end face 110 and the second mounting end face 201 is 20mm to 40mm.

[0046] The present invention also provides a sofa seat, including a linkage device and a seat body, wherein the linkage device is installed on the seat body, and the linkage device is the linkage device of the above embodiment.

[0047] In actual use, two mounting plates 300 are set, which are arranged relatively at intervals. Both mounting plates 300 are used to install the seat frame of the sofa chair. There are two mounting frames 301 and two sets of linkage devices. The second rod segment 411 in both sets of linkage devices is connected to the mounting frame 301. The two ends of the first support rod 51 in the drive assembly are connected to the two second rod segments 411 respectively. In this way, during the drive assembly 5, the two sets of linkage devices are simultaneously driven to extend or retract, which improves the stability of the sofa chair.

[0048] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0049] According to the linkage device provided by the present invention, a first shelf 100 and a second shelf 200 are moved. The linkage device includes a first support component 1, a second support component 2, and a first limiting component 3. The first support component 1 is connected to the first shelf 100 and is movably positioned. The first support component 1 drives the first shelf 100 to extend or retract. The second support component 2 is hinged to the first support component 1. The second shelf 200 is disposed on the second support component 2 and is foldable, so that the first support component 1 and the second shelf 200 can be moved simultaneously through the second support component 2. The first limiting component 3 is disposed on the second support component 2 near one end of the first support component 1, and blocks the first support component 1 to place the first support component 1 in a first predetermined position. The first limiting component 3 is also disposed on the first support component 1 near one end of the second support component 2, and blocks the second support component 2 to place the second support component 2 in a second predetermined position. The first support component 1 supports the first shelf 100, and the second support component 2 supports the second shelf 200. The second support component 2 is hinged to the first support component 1. As the second support component 2 moves, the first shelf 100 and the second shelf 200 can move simultaneously. By setting a first limiting component 3 on the first support component 1 or the second support component 2, the first supporting component 3 can stop and support the first support component 1 when it rotates to the first predetermined position, or stop and support the second support component 2 when it rotates to the second predetermined position, thereby improving the stability of the linkage device.

[0050] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention.

[0051] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0052] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A linkage device, characterized in that, include: First support component (1), the position of the first support component (1) is movably set; The second support component (2) is hinged to the first support component (1), and the second support component (2) is foldably configured to drive the first support component (1) to move. A first limiting component (3) is disposed on the second support assembly (2) near one end of the first support assembly (1). The first limiting component (3) blocks the first support assembly (1) so that the first support assembly (1) is in a first predetermined position; or The first limiting component (3) is disposed at one end of the first support component (1) near the second support component (2). The first limiting component (3) blocks the second support component (2) so that the second support component (2) is in a second predetermined position. The linkage device further includes a drive component (5), which is connected to the second support component (2); The second support component (2) includes: a second link (21), the two ends of the second link (21) are respectively connected to the first support component (1) and the drive component (5), the drive component (5) drives the first support component (1) to move through the second link (21), and the first limiting component (3) is disposed on the second link (21); The linkage device also includes: a third support component (4); The third support component (4) includes: a fifth link (40), the two ends of which are connected to the drive component (5) and the second support component (2) respectively; and a sixth link (41), the two ends of which are hinged to the second support component (2) and the drive component (5) respectively. The sixth link (41) includes a first link segment (410) and a second link segment (411) that are hinged to each other. The first support assembly (1) includes a first link (11); the second support assembly (2) includes a support plate (20), a second link (21), a third link (22), and a fourth link (23); one end of the third link (22) is hinged to the first link (11), and the other end is hinged to the support plate (20); one end of the second link (21) is hinged to the first link (11), and the other end is connected to the support plate (20) through the first rod segment (410); one end of the fourth link (23) is hinged to the third link (22), and the other end is hinged to the second link (21); the second link (21), the third link (22), the fourth link (23), the support plate (20), and the first rod segment (410) form a second linkage mechanism; The linkage device further includes: a seventh link (7) and a mounting frame (301); the seventh link (7) is hinged to the end of the fifth link (40) away from the second support assembly (2), and its other end is hinged to the mounting frame (301); the end of the second rod segment (411) away from the first rod segment (410) is hinged to the mounting frame (301); the vertical distance H1 between the mounting frame (301) and the ground is 208mm to 450mm; The linkage device includes a retracted state and an extended state; the first support component (1) includes a first mounting end face (110); the second support component (2) includes a second mounting end face (201); when the linkage device is in the retracted state, the first mounting end face (110) and the second mounting end face (201) are approximately parallel.

2. The linkage device according to claim 1, characterized in that, The second support component (2) also includes: The support plate (20) is provided with a second mounting end face (201) and a second free end face (202) opposite to the second mounting end face (201). The third link (22) has its two ends hinged to the end of the support plate (20) and the first support assembly (1), respectively. The fourth link (23) is hinged at both ends to the middle of the second link (21) and the middle of the third link (22), respectively.

3. The linkage device according to claim 2, characterized in that, The first support assembly (1) includes a first link (11), which has a first mounting end face (110) and a first free end (111) opposite to the first mounting end face (110). Along the direction from the first mounting end face (110) to the first free end (111), the first connecting rod (11) has a first hinge point (101) and a second hinge point (102), the third connecting rod (22) is hinged at the first hinge point (101), and the second connecting rod (21) is hinged at the second hinge point (102); The second link (21), the third link (22), the fourth link (23) and the first link (11) form the first link mechanism.

4. The linkage device according to claim 1, characterized in that, The two ends of the third support component (4) are connected to the driving component (5) and the second support component (2) respectively. The driving component (5) drives the third support component (4) to move, so that the third support component (4) drives the second support component (2) to move.

5. The linkage device according to claim 4, characterized in that, The fifth link (40) is hinged to the sixth link (41).

6. The linkage device according to claim 5, characterized in that, The first rod segment (410) includes a connecting segment (4101), which is hinged to the second support assembly (2), the second rod segment (411) is connected to the drive assembly (5), and the rod body of the fifth link (40) is hinged to the second rod segment (411); The fifth link (40) is also provided with a second limiting component (6), which stops the sixth link (41) so that the sixth link (41) is in a third predetermined position.

7. The linkage device according to claim 1, characterized in that, When the linkage device is in the retracted state, the maximum horizontal distance a between the first mounting end face (110) and the second mounting end face (201) is 15mm to 50mm; When the linkage device is in the extended state, the maximum distance L between the end of the first mounting end face (110) and the end of the second mounting end face (201) is 310mm to 410mm.

8. A sofa chair, comprising a linkage device and a seat body, wherein the linkage device is mounted on the seat body, characterized in that, The linkage device is the linkage device according to any one of claims 1 to 7.

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