Chair and tray with seat-back linkage function

Abstract

The present invention discloses a chair and a tray with a seat-back linkage function, comprising a base, a tailstock, a top seat, a first connecting member, and a toothed plate; the side of the toothed plate is protruded with external teeth arranged in a fan shape, and the side of the first connecting member is provided with external teeth arranged in a fan shape; the tailstock and the base are located below the top seat, the first connecting member is hinged to the top seat, the first connecting member is hinged to the tailstock, and the tailstock is hinged to the base via a third connecting shaft; the front of the base and the front of the top seat are movably connected, the toothed plate is fixedly arranged on the base, and the external teeth of the toothed plate mesh with the external teeth of the first connecting member; the central axis of the fan-shaped external teeth on the toothed plate coincides with the axis of the third connecting shaft, and the central axis of the fan-shaped external teeth on the first connecting member coincides with the axis of the second connecting shaft. Such an arrangement allows the meshing position of the first connecting member and the toothed plate to be adjusted during the assembly of the tray, thereby adjusting the initial state of the tray and the linkage process of the top seat and the tailstock, thereby improving the versatility of the tray.

Description

Technical Field

[0001] The present invention relates to the field of seating, in particular to a chair and a tray thereof with a seat-back linkage function. Background Art

[0002] As one of the indispensable daily necessities, with the continuous improvement of people's living standards, people's demand for seat comfort is also getting higher and higher. Therefore, functional seats with synchronized seat-back linkage have emerged, which can achieve synchronous operation of the seat and back when reclining, thereby improving the comfort of use.

[0003] The patent technical document with publication number CN115413901A discloses a chassis device of an ergonomic chair, including: a base; a rocker configured to connect a chair back; a seat connector configured to connect a chair seat; a synchronization pin is connected between the rear end of the seat connector and the rocker; a sinking guide mechanism, including an oblique guide groove provided on the base and a guide rod provided on the seat connector; the front end of the seat connector follows the movement of the rocker to make the guide rod slide along the oblique guide groove; in the initial state, the seat connector is in a horizontal state, and the guide rod is located at the front upper end of the oblique guide groove; in the reclining state, the rocker follows the reclining of the chair back and drives the rear end of the seat connector to move downward and backward; the front end of the seat connector slides downward and backward along the oblique guide groove; the seat connector as a whole sinks and moves backward relative to the base; the seat connector moves to an inclined state with a higher front and a lower back, and the chair seat follows the seat connector to tilt so that the front end of the chair seat tilts up.

[0004] In the prior art, since the seat and the backrest are connected by a rocker, the seat tilt angle is closely limited by the backrest swing angle during the linkage process. Therefore, the change in the seat angle is small. If the chair wants to have a deeper sitting depth, the only way is to continue to increase the backrest swing angle. Summary of the Invention

[0005] In order to solve the problem in the prior art that the change in the seat depth of the chair is small when the seat and the backrest are linked, the purpose of the present invention is to provide a chair and a tray with a seat-back linkage function, so that the seat inclination angle can be adjusted in a larger range and the seat inclination angle adjustment rate can be faster.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions: a tray with a seat-back linkage function, comprising a base for mounting chair legs, a tailstock for mounting chair backs and a top seat for mounting chair seats, and also comprising a first connecting member and a toothed plate; the side surface of the toothed plate is raised with external teeth, and the external teeth on the toothed plate are arranged in a fan shape; the side surface of the first connecting member is provided with external teeth, and the external teeth of the first connecting member are arranged in a fan shape; the tailstock and the base are located below the top seat, the first connecting member is hinged to the top seat through a first connecting shaft, the first connecting member is hinged to the tailstock through a second connecting shaft, the tailstock is hinged to the base through a third connecting shaft, and the front of the base and the top seat are hinged. The front part is movably connected, the toothed plate is fixedly connected or integrally formed on the base, and the outer teeth of the toothed plate are engaged with the outer teeth of the first connecting member; the central axis of the fan-shaped outer teeth on the toothed plate coincides with the axis of the third connecting shaft, and the central axis of the fan-shaped outer teeth on the first connecting member coincides with the axis of the second connecting shaft; when the rear part of the tailstock swings downward, the tailstock drives the second connecting shaft to swing downward around the third connecting shaft, and the second connecting shaft pulls the rear part of the top seat to sink through the first connecting member; wherein, since the first connecting member and the toothed plate are connected by tooth meshing, the first connecting member rotates around the second connecting shaft, and the first connecting member drives the tailstock to move through the first connecting shaft.

[0007] Preferably, the two first connecting members are respectively arranged on both sides of the base, and the two first connecting members are installed on the same first connecting shaft.

[0008] Preferably, the two toothed plates are respectively arranged on both sides of the base, and the two toothed plates are mounted on the same third connecting shaft and fixedly connected to the base.

[0009] Preferably, the toothed plate is arranged on the front side of the first connecting member.

[0010] Preferably, a second connecting member is further included, which is located in front of the first connecting member and the tailstock, the lower end of the second connecting member is hinged to the base through a fourth connecting shaft, and the upper end of the second connecting member is hinged to the top seat through a fifth connecting shaft.

[0011] Preferably, a sliding hole is provided on the top seat, and a fifth connecting shaft is installed on the base. The fifth connecting shaft passes through the sliding hole and can move in the sliding hole.

[0012] Preferably, a limit shaft is installed on the base, and the limit shaft is located below the front part of the tailstock.

[0013] Preferably, an elastic member is further included, and two ends of the elastic member are respectively connected to two of the base, the top seat and the tail seat.

[0014] Preferably, the elastic member includes a spring.

[0015] A chair comprises the above-mentioned tray with seat-back linkage function.

[0016] The beneficial effects of the technical solution of the present invention are as follows: in the above solution, the meshing of the first connecting member and the toothed plate can better limit the angle of the top seat, making the process of the first connecting member rotating around the second connecting axis more stable; furthermore, the first connecting member can operate independently and synchronously with the tailstock, and the sinking distance of the first connecting member and the sinking distance of the second connecting axis can both act on the top seat, thereby increasing the top seat angle adjustment range and adjustment rate. The pallet is more versatile. When manufacturing chairs of different styles and functions, the meshing position of the first connecting member on the toothed plate can be pre-adjusted during the assembly process of the pallet, thereby adjusting the initial state of the pallet and the linkage path of the top seat and tailstock, thereby reducing the difficulty of chair design and production and reducing the manufacturing precision and production cost of the pallet. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of a tray in Example 1;

[0018] Figure 2 This is a schematic structural diagram of the tray after removing the top seat in Example 1;

[0019] Figure 3 This is a schematic structural diagram of a tray in Example 2;

[0020] Figure 4 This is a schematic structural diagram of the tray after removing the top seat in Example 2;

[0021] Figure 5 This is a schematic structural diagram of a tray in Example 3;

[0022] Figure 6 This is a schematic structural diagram of the tray after removing the top seat in Example 3;

[0023] Figure 7 This is a schematic structural diagram of the pallet before the tailstock swings in Example 3;

[0024] Figure 8 This is a schematic structural diagram of the pallet after the tailstock swings in Example 3.

[0025] Figure markings: 1. base; 11. third connecting part; 2. tail stock; 21. first connecting plate; 22. second connecting plate; 3. top seat; 31. first connecting part; 32. second connecting part; 33. sliding hole; 4. first connecting member; 5. second connecting member; 51. fourth connecting part; 6. toothed plate; 7. elastic member; 71. spring; 72. first mounting seat; 73. second mounting seat; 81. first connecting shaft; 82. second connecting shaft; 83. third connecting shaft; 84. fourth connecting shaft; 85. fifth connecting shaft; 86. sixth connecting shaft; 87. limit shaft. DETAILED DESCRIPTION

[0026] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0027] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more, unless otherwise explicitly specified.

[0029] In the present invention, unless otherwise expressly specified or limited, terms such as "installed," "connected," "connect," and "fixed" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal linkages between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0030] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0031] The following embodiments are described in terms of Figure 1 The position shown, Figure 1 In the middle, the position of the top seat is considered the top, the position of the base is considered the bottom, the position of the tail seat is considered the back, and then the left and right are discussed based on up and down. Example 1

[0032] like Figure 1 and Figure 2 The displayed pallet includes a base 1, a tail stock 2, a top stock 3, a first connecting member 4, a second connecting member 5, a toothed plate 6 and an elastic member 7; the first connecting member 4 is located on the rear side of the second connecting member 5, the first connecting member 4 is hinged to the top stock 3 through a first connecting shaft 81, the first connecting member 4 is hinged to the tail stock 2 through a second connecting shaft 82, the tail stock 2 is hinged to the base 1 through a third connecting shaft 83, one end of the second connecting member 5 is hinged to the base 1 through a fourth connecting shaft 84, and the other end of the second connecting member 5 is hinged to the top stock 3 through a fifth connecting shaft 85; the first connecting shaft 81 is located above the second connecting shaft 82, the fifth connecting shaft 85 is located above the fourth connecting shaft 84, and the third connecting shaft 83 is located between the second connecting shaft 82 and the fourth connecting shaft 84; the two ends of the elastic member 7 are respectively connected to the tail stock 2 and the base 1, and the toothed plate 6 is fixedly connected or integrally formed on the base 1.

[0033] With such arrangement, when the rear part of the tail stock 2 swings downward, the rear part of the top seat 3 can be pulled to swing rearward and downward by the first connecting member 4, and the front part of the top seat 3 pulls the second connecting member 5 to swing around the fourth hinge axis; wherein, when the first connecting member 4 swings, since the first connecting member 4 and the toothed plate 6 are pressed against each other, the toothed plate 6 drives the first connecting member 4 to rotate around the second connecting axis 82 through the outer tooth segment. When the first connecting member 4 rotates around the second connecting axis 82, the sinking speed of the rear part of the top seat 3 can be accelerated, thereby enabling the top seat 3 to obtain a larger inclination angle, so that the user can get a better usage experience.

[0034] During the assembly process of the pallet, the first connecting member can be engaged with the external teeth at different positions on the toothed plate to adjust the initial state of the pallet and the linkage path of the top seat and the tail seat, thereby reducing the manufacturing accuracy and production cost of the pallet; at the same time, since the initial positions of the top seat and the tail seat can be adjusted, the pallet can be suitable for different styles of chairs, and the pallet is more versatile.

[0035] To further stabilize the movement and support of the top seat 3, in this embodiment, the toothed plate 6 has external teeth protruding from its sides, arranged in a fan-shaped pattern. The first connecting member 4 also has external teeth on its sides, arranged in a fan-shaped pattern. The toothed plate 6 and the first connecting member 4 are connected by meshing external teeth. This arrangement further stabilizes the linkage between the tailstock 2 and the top seat 3. Furthermore, preferably, the central axis of the fan-shaped external teeth of the toothed plate 6 coincides with the axis of the third connecting shaft 83, and the reference axis of the external teeth on the first connecting member 4 coincides with the axis of the second connecting shaft 82. This arrangement results in a simpler and more compact structure for the pallet.

[0036] To make the structure of the tray more compact, in this embodiment, the bottom of the top seat 3 protrudes downward and has two first connecting parts 31. The left and right sides of the base 1 are bent upward to form a third connecting part 11. The left and right ends of the second connecting member 5 are bent backward to form a fourth connecting part 51. The upper part of the fourth connecting part 51 is inserted from front to back between the two first connecting parts 31. The fourth connecting part 51 is hinged to the first connecting part 31 via a fifth connecting shaft 85. The lower part of the fourth connecting part 51 is inserted from front to back between the two third connecting parts 11. The fourth connecting part 51 is hinged to the third connecting part 11 via a fourth connecting shaft 84. Furthermore, the tailstock 2 includes two first connecting plates 21 arranged on the left and right. The two first connecting plates 21 are fixedly connected by a second connecting plate 22. The first connecting plate 21 is inserted from back to front between the two third connecting parts 11 of the base 1. The first connecting plate 21 is hinged to the third connecting part 11 of the base 1 via a third connecting shaft 83.

[0037] Further preferably, the distance between the two first connection parts 31 is the same as the distance between the two third connection parts 11 , and the distance between the two first connection plates 21 is the same as the distance between the two fourth connection parts 51 .

[0038] In order to provide balance for the top seat 3, in this embodiment, there are two first connecting members 4, and the third connecting portion 11 and the first connecting portion 31 are both located between the two first connecting members 4; there are two toothed plates 6, and the two toothed plates 6 are respectively arranged on the left and right sides of the base, and the toothed plates 6 and the first connecting members 4 are arranged in a one-to-one correspondence.

[0039] To facilitate the installation of the toothed plate 6, in this embodiment, the third connecting shaft 83 is installed on the base 1, the tailstock 2 is sleeved on the third connecting shaft 83, the toothed plate 6 is installed on the third connecting shaft 83, and the toothed plate 6 is fixed to the base by welding.

[0040] To improve the consistency of movement of the two first connecting members 4, in this embodiment, the first connecting shaft 81 transversely extends through the two first connecting portions 31 of the top seat 3, with the two first connecting members 4 fixedly mounted on either end of the first connecting shaft 81. The third connecting shaft 83 transversely extends through the two third connecting portions 11 of the base 1, with the two toothed plates 6 mounted on either end of the third connecting shaft 83. This allows the two first connecting members 4 to move synchronously, improving the smoothness of the tray's movement. Further preferably, the fourth connecting shaft 84 and the fifth connecting shaft 85 transversely extend through both the first connecting portion 31 and the fourth connecting portion 51.

[0041] To ensure that the elastic member 7 has sufficient elastic force, in this embodiment, a limit shaft 87 is fixed to the base 1. The limit shaft 87 is located between the third connecting shaft 83 and the fourth connecting shaft 84, and the limit shaft 87 is located below the front end of the tailstock 2. This arrangement limits the lowest position of the front end of the tailstock 2 by the limit shaft 87, and ensures that the elastic member 7 has sufficient tension to reset the tailstock 2.

[0042] In this embodiment, the elastic member 7 includes a spring 71, a first mounting seat 72, and a second mounting seat 73. The first mounting seat 72 and the second mounting seat 73 are respectively located at opposite ends of the spring 71. The first mounting seat 72 is located on the fourth connecting shaft 84 at the front end of the base 1, and the second mounting seat 73 is sleeved on the sixth connecting shaft 86 at the front end of the tailstock 2. Further preferably, there are two springs 71, each of which is mounted with the first mounting seat 72 and the second mounting seat 73, wherein the two first mounting seats 72 are integrally formed. This arrangement, through the two sets of springs 71, makes the movement of the tailstock 2 more stable and can provide more tension to ensure the consistency of the reciprocating motion of the tray. In other embodiments, the spring 71 can also be a tension spring.

[0043] A chair comprises the above-mentioned tray, and further comprises a seat, a backrest and legs, wherein the legs are mounted on a base 1, the backrest is mounted on a tail seat 2, and the seat is mounted on a top seat 3.

[0044] The linkage process of the tailstock 2 and the top seat 3 is as follows: the top of the chair back swings backward, the chair back drives the tailstock 2 to rotate around the third connecting shaft 83, the rear end of the tailstock 2 sinks and the front part rises, the spring 71 is stretched by the tension from the tailstock 2, the tailstock 2 pulls the rear part of the top seat 3 to sink through the first connecting member 4, and the front part of the top seat 3 pulls the top of the second connecting member 5 to make the second connecting member 5 rotate around the fourth connecting shaft 84; in the process of the sinking of the first connecting member 4, since the tailstock 2 is centered on the third connecting shaft 83, the tailstock 2 drives the second connecting shaft 82 to rotate around the third connecting shaft 83, and since the first connecting member 4 and the toothed plate 6 are connected by external teeth, the toothed plate 6 can drive the first connecting member 4 to rotate around the second connecting shaft 82 as the rotation center through the external teeth, thereby accelerating the sinking speed of the rear part of the top seat 3.

[0045] The process of resetting the tailstock is as follows: the spring 71 pulls the sixth connecting shaft 86, so that the sixth connecting shaft 86 pulls the front end of the tailstock 2 to swing downward, and the tailstock 2 rotates with the third connecting shaft 83 as the rotation center, and the rear part of the tailstock 2 drives the second connecting shaft 82 and the first connecting member 4 to swing upward. Since the first connecting member 4 and the toothed plate 6 are connected by external teeth, during the process of the second connecting shaft 82 rotating around the third connecting shaft 83, the first connecting member 4 rotates with the second connecting shaft 82 as the rotation center and accelerates the rate at which the rear part of the top seat 3 rises; the first connecting shaft 81 pushes the rear part of the top seat 3 to tilt upward, and the top seat 3 pushes the second connecting member 5 through the fifth connecting shaft 85, so that the second connecting member 5 rotates with the fourth connecting shaft 84 as the rotation center until the pallet is completely reset. Example 2

[0046] Different from Example 1, Figure 3 and Figure 4 As shown, in this embodiment, the two ends of the elastic member 7 are respectively connected to the first connecting shaft 81 and the third connecting shaft 83; the first mounting seat 72 is provided on the third connecting shaft 83 at the front of the base 1, and the second mounting seat 73 is sleeved on the first connecting shaft 81 at the front of the tail stock 2.

[0047] In this embodiment, the linkage process of the tailstock 2 and the top seat 3 is as follows: the top of the chair back swings backward, the chair back drives the tailstock 2 to rotate around the third connecting shaft 83, the rear end of the tailstock 2 sinks and the front end rises, the tailstock 2 pulls the rear end of the top seat 3 to sink through the first connecting member 4 and the first connecting shaft, and the front end of the top seat 3 pulls the top of the second connecting member 5 to make the second connecting member 5 rotate around the fourth connecting shaft 84; in the process of the first connecting member 4 sinking, since the tailstock 2 is centered on the third connecting shaft 83, the tailstock 2 drives the second connecting shaft 82 to rotate around the third connecting shaft 83, and since the first connecting member 4 and the toothed plate 6 are engaged with the external teeth, the toothed plate 6 can drive the first connecting member 4 to rotate around the second connecting shaft 82 as the rotation center through the external teeth, thereby accelerating the sinking speed of the rear end of the top seat 3, so that the spring 71 is stretched by the tension from the first connecting shaft 81.

[0048] In this embodiment, the process of resetting the tailstock is as follows: the spring 71 pulls the first connecting shaft 81 to swing upward, the first connecting shaft 81 pulls the top seat 3 and the first connecting member 4 to swing upward synchronously, the first connecting member 4 pulls the tailstock 2 through the second connecting shaft 82, so that the tailstock 2 rotates around the third connecting shaft 83 as the rotation center, the toothed plate 6 pulls the first connecting member 4 through the external teeth, so that the first connecting member 4 rotates around the second connecting shaft 82 as the rotation center, and accelerates the rate of resetting the top seat 3 until the pallet is completely reset.

[0049] With such an arrangement, during the movement of the tray, the tension applied to the spring 71 comes from the rotation of the first connecting member 4 around the second connecting shaft 82 . Example 3

[0050] Different from Example 1, Figures 5 to 8 As shown, in this embodiment, the top seat 3 and the base 1 are slidably connected via a fourth connecting shaft 84. Specifically, the spacing between the two first connecting portions 31 on the top seat 3 is smaller than the spacing between the two third connecting portions 11 on the base 1; the front portion of the third connecting portion 11 is tilted upward to form a retaining portion, and the first connecting portion 31 is inserted from top to bottom between the two retaining portions. The first connecting portion 31 is separately provided with sliding holes 33. The fourth connecting shaft 84 and the fifth connecting shaft 85 are inserted through the retaining portions, and the fifth connecting shaft 85 extends laterally and passes through the two sliding holes 33.

[0051] With such an arrangement, the movement trajectory of the rear portion of the top seat 3 remains unchanged, while the tilting amplitude of the front portion of the top seat 3 is made greater.

[0052] In this embodiment, two second connection parts 32 are protruded from the bottom of the top seat 3. The spacing between the two second connection parts 32 is the same as the spacing between the two third connection parts 11. The second connection parts 32 are located above the third connection parts 11. The first connection member 4 is hinged to the second connection parts 32 via the first connection shaft 81. The first connection part 31 and the second connection part 32 are fixedly connected.

[0053] In this embodiment, the linkage process of the tailstock 2 and the top seat 3 is as follows: the top of the chair back swings backward, the chair back drives the tailstock 2 to rotate around the third connecting shaft 83, the rear part of the tailstock 2 sinks and the front part rises, the spring 71 is stretched by the tension from the tailstock 2, the tailstock 2 pulls the rear part of the top seat 3 to sink through the first connecting member 4, the front part of the top seat 3 moves backward, the fifth connecting shaft 85 supports the inner wall of the sliding hole 33, the fifth connecting shaft 85 gradually approaches the front part of the top seat, and the front part of the top seat 3 gradually rises; wherein, in the process of sinking of the rear part of the first connecting member 4, since the tailstock 2 is centered on the third connecting shaft 83, the tailstock 2 drives the second connecting shaft 82 to rotate around the third connecting shaft 83, and since the first connecting member 4 and the toothed plate 6 are engaged with each other through the external teeth, the toothed plate 6 can drive the first connecting member 4 to rotate around the second connecting shaft 82 through the external teeth, thereby accelerating the sinking speed of the rear part of the top seat 3.

[0054] The process of resetting the tailstock is as follows: the spring 71 pulls the sixth connecting shaft 86, so that the sixth connecting shaft 86 pulls the front end of the tailstock 2 to swing downward, and the tailstock 2 rotates with the third connecting shaft 83 as the rotation center, and the rear part of the tailstock 2 drives the second connecting shaft 82 and the first connecting member 4 to swing upward. Since the first connecting member 4 and the toothed plate 6 are connected by external teeth, during the process of the second connecting shaft 82 rotating around the third connecting shaft 83, the first connecting member 4 rotates with the second connecting shaft 82 as the rotation center and accelerates the rate at which the rear part of the top seat 3 rises; the first connecting shaft 81 pushes the rear part of the top seat 3 to rise, and the front part of the top seat 3 sinks and slides on the fifth connecting shaft 85 until the pallet is completely reset.

[0055] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0056] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention.

Claims

1. A tray with a seat-back linkage function, comprising a base (1) for mounting a chair leg, a tail seat (2) for mounting a chair back, and a top seat (3) for mounting a chair seat, characterized in that: It also includes a first connecting member (4) and a toothed plate (6); the side surface of the toothed plate (6) is protruded with external teeth, and the external teeth on the toothed plate (6) are arranged in a fan shape; the side surface of the first connecting member (4) is provided with external teeth, and the external teeth of the first connecting member (4) are arranged in a fan shape; The tailstock (2) and the base (1) are located below the top seat (3); the first connecting member (4) is hinged to the top seat (3) via a first connecting shaft (81); the first connecting member (4) is hinged to the tailstock (2) via a second connecting shaft (82); the tailstock (2) is hinged to the base (1) via a third connecting shaft (83); the front of the base (1) and the front of the top seat (3) are movably connected; the toothed plate (6) is fixedly connected to or integrally formed on the base (1); and the outer teeth of the toothed plate (6) are engaged with the outer teeth of the first connecting member (4); The central axis of the sector-shaped external teeth on the toothed plate (6) coincides with the axis of the third connecting shaft (83), and the central axis of the sector-shaped external teeth on the first connecting member (4) coincides with the axis of the second connecting shaft (82); When the rear portion of the tailstock (2) swings downward, the tailstock (2) drives the second connecting shaft (82) to swing downward around the third connecting shaft (83), and the second connecting shaft (82) pulls the rear portion of the top seat (3) to sink through the first connecting member (4); wherein, since the first connecting member (4) and the toothed plate (6) are connected by teeth meshing, the first connecting member (4) rotates around the second connecting shaft (82), and the first connecting member (4) drives the tailstock (2) to move through the first connecting shaft (81).

2. The tray with seat-back linkage function according to claim 1, characterized in that: The two first connecting members (4) are respectively arranged on both sides of the base (1), and the two first connecting members (4) are mounted on the same first connecting shaft (81).

3. The tray with seat-back linkage function according to claim 1, characterized in that: The two toothed plates (6) are respectively arranged on both sides of the base (1). The two toothed plates (6) are mounted on the same third connecting shaft (83) and are fixedly connected to the base (1).

4. The tray with seat-back linkage function according to claim 1, characterized in that: The toothed plate (6) is arranged on the front side of the first connecting member (4).

5. The tray with seat-back linkage function according to claim 1, characterized in that: The second connecting member (5) is located in front of the first connecting member (4) and the tailstock (2), the lower end of the second connecting member (5) is hinged to the base (1) via a fourth connecting shaft (84), and the upper end of the second connecting member (5) is hinged to the top seat (3) via a fifth connecting shaft (85).

6. The tray with seat-back linkage function according to claim 1, characterized in that: A sliding hole (33) is provided on the top seat (3), and a fifth connecting shaft (85) is installed on the base (1). The fifth connecting shaft (85) passes through the sliding hole (33) and is movable in the sliding hole (33).

7. The tray with seat-back linkage function according to claim 1, characterized in that: A limit shaft (87) is mounted on the base (1), and the limit shaft (87) is located below the front portion of the tailstock (2).

8. The tray with seat-back linkage function according to claim 1, characterized in that: It also includes an elastic member (7), two ends of which are respectively connected to two of the base (1), the top seat (3) and the tail seat (2).

9. The tray with seat-back linkage function according to claim 8, characterized in that: The elastic member (7) includes a spring (71).

10. A chair, characterized in that: A tray with a seat-back linkage function comprising any one of claims 1-9.

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