Chair and seat plate thereof

Abstract

A chair and a seat plate thereof. The seat plate comprises a bottom base (2) for mounting support legs, a top base (3) for mounting a chair seat, an elastic support member (5) for driving the seat plate to reset, and a tapered sleeve (72) for mounting a gas lift. The top base (3) is located above the bottom base (2); the front part of the top base (3) and the front part of the bottom base (2) are hinged by means of a hinge shaft (4); the rear part of the top base (3) and the rear part of the bottom base (2) are connected by means of the elastic support member (5); the tapered sleeve (72) is mounted on the bottom base (2), and the tapered sleeve (72) is located between the hinge shaft (4) and the elastic support member (5); the elastic support member (5) comprises a compression spring (53) and an upper positioning base (51), the top of the compression spring (53) is mounted on the upper positioning base (51), and the bottom of the compression spring (53) is connected to the bottom base (2); and an arc-shaped groove (35) is provided on the top base (3), an arc-shaped upper positioning portion (513) protrudes from the upper positioning base (51), the upper positioning portion (513) is inserted into the arc-shaped groove (35), and the upper positioning portion (513) is movable relative to the top base (3). In this way, during the movement of the seat plate, the contact point between the top of the elastic support member (5) and the top base (3) continuously changes, so that the compression spring (53) can be maintained in a vertical state as much as possible, thereby providing more stable support for the top base (3).

Description

Chairs and their trays Technical Field

[0001] This invention relates to the field of home furnishings, and more particularly to a chair and its tray. Background Technology

[0002] As an essential piece of living furniture, chairs have become increasingly popular due to rising living standards. As people's living standards improve, their demand for chair comfort has also increased. As a result, chairs with a swing function have emerged to achieve synchronized operation between the chair and the user, thereby improving user comfort.

[0003] The prior art disclosed in CN201542120U is a seat chassis with adjustable tilt force, including a middle plate and a large plate. The rear of the large plate can swing downward relative to the middle plate around a pivot. A knob is provided below the front of the middle plate. The knob has a cavity. A mounting plate fixed to the knob is provided in the cavity. A worm gear is provided at the position below the mounting plate corresponding to the knob. The worm gear can rotate relative to the knob around its own axis. A worm is provided in the knob next to the worm gear and meshes with the worm gear. One end of the handle extends from outside the knob into the knob and is connected to the worm gear for transmission. An adjusting bolt passes through the large plate, the middle plate and the mounting plate in the knob from top to bottom and is threaded to the worm gear. The adjusting bolt is coaxial with the worm gear. A helical spring is sleeved on the part of the adjusting bolt below the middle plate and above the mounting plate.

[0004] In the prior art, the structure of the seat chassis is relatively complex, and most of the force of the seat plate is transmitted to the knob, which puts high demands on the strength of the knob; the knob in the prior art is located under the seat, which also affects the overall aesthetics of the seat. Technical issues

[0005] In order to solve the problem of complex chair tray structure caused by the adjustment structure of the chair tray through the external knob in the prior art, the purpose of the present invention is to provide a chair and its tray with a simpler structure, more stable support, and a simple and beautiful appearance. Technical solutions

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a tray, comprising a base for mounting support legs, a top seat for mounting a chair seat, an elastic support for driving the tray to reset, and a cone for mounting a gas spring; the top seat is located above the base, the front part of the top seat and the front part of the base are hinged together, and the rear part of the top seat and the rear part of the base are connected by the elastic support; the cone is mounted on the base and is located between the cone and the elastic support; the elastic support includes a compression spring and an upper positioning seat, the top of the compression spring is mounted on the upper positioning seat, and the bottom of the compression spring is connected to the base; the top seat is provided with an arc-shaped groove, and the upper positioning seat has an arc-shaped upper positioning part protruding from it, the upper positioning part is inserted into the arc-shaped groove, and the upper positioning part is movable relative to the top seat.

[0007] Preferably, a second rod is also included, which is movably mounted on the base and located below the top seat. By pulling or rotating the second rod, the swing range of the top seat can be adjusted or the lifting and lowering of the gas spring can be controlled.

[0008] Preferably, the second rod has multiple limiting positions on the base. By adjusting the position of the second rod on the base, the second rod can be made to abut against different parts of the top seat, thereby controlling the range of motion of the top seat.

[0009] Preferably, the top seat has a first notch and a second notch, with the top of the second notch being higher than the top of the first notch; moving the second rod can make the second rod connect with the first notch or the second notch, thereby changing the lower limit of the top seat's range of motion.

[0010] Preferably, a pressure plate is fixed on the second rod, and the pressure plate is located above the cone. By rotating the second rod, the pressure plate can be driven to swing and control the lifting and lowering of the air rod.

[0011] Preferably, a first rod is fixed on the base, and a sliding hole is provided on the top seat. The first rod slides into the sliding hole. The elastic support can push the top seat so that the first rod abuts against the bottom of the sliding hole, thereby limiting the upper limit of the swing of the top seat.

[0012] Preferably, a swingable pressure plate is installed inside the base, which is located above the cone and is used to control the lifting and lowering of the pneumatic rod; the first rod is located above the pressure plate and can limit the upper limit of the pressure plate's range of motion.

[0013] Preferably, the elastic support also includes a lower positioning seat, the bottom of the compression spring is mounted on the lower positioning seat, and the lower positioning seat is fixed on the base.

[0014] Preferably, the inner diameter of the arc-shaped groove is larger than the outer diameter of the upper positioning part.

[0015] A chair includes the aforementioned tray, with the top of a gas spring mounted on a cone, support legs mounted on the bottom of the gas spring, and a seat mounted on a top seat. Beneficial effects

[0016] The beneficial effects of the technical solution of the present invention are as follows: the hinge shaft is located at the front of the tray, the elastic support is located at the rear of the tray, and the conical sleeve for mounting the gas spring is located between the hinge shaft and the elastic support. This forms a triangular structure with the first rod, the conical sleeve, and the hinge shaft, which makes the tray's connection and support structure more stable and also simplifies the tray's structure. In the above structure, the elastic support allows the top seat to swing with the user's movements, making the tray more comfortable. In the above structure, the elastic support is located inside the tray, making the tray's structure simpler and more aesthetically pleasing. In the above structure, during the movement of the tray, the contact point between the top of the elastic support and the top seat changes continuously, allowing the compression spring to remain as vertical as possible, thus providing more stable support for the top seat, reducing the frequency of tray failures, and simplifying the connection structure between the elastic support and the top seat. Furthermore, it reduces the difficulty of tray assembly, making the tray's structure simpler. Attached Figure Description

[0017] Figure 1 is a schematic diagram of the pallet structure.

[0018] Figure 2 is a schematic diagram of the tray structure after the bottom shell is removed.

[0019] Figure 3 is a schematic diagram of the tray structure after the bottom shell is removed.

[0020] Figure 4 is a schematic diagram of the tray structure after the bottom shell is removed.

[0021] Figure 5 is a schematic diagram of the pallet structure after removing the bottom shell and top seat.

[0022] Figure 6 is a schematic diagram of the base structure.

[0023] Figure 7 is a schematic diagram of the top seat structure.

[0024] Figure 8 is a schematic diagram of the top seat structure.

[0025] Figure 9 is a schematic diagram of the elastic support component.

[0026] Figure 10 is a schematic diagram of the upper positioning seat.

[0027] Figure 11 is a schematic diagram of the lower positioning seat.

[0028] Reference numerals: 1. Bottom shell; 2. Base; 21. Receiving cavity; 22. First through hole; 23. First positioning protrusion; 24. Second through hole; 25. Second positioning protrusion; 26. Third through hole; 27. Connecting hole; 28. Mounting seat; 3. Top seat; 31. Side wing; 32. Fourth through hole; 33. Sliding hole; 34. Arc-shaped protrusion; 35. Arc-shaped groove; 36. First notch; 37. Second notch; 38. Clearance hole; 4. Hinge shaft; 41. Bushing; 5. Elastic support; 51. Upper positioning seat; 511. Upper limit part; 512. Upper connecting part; 513. Upper positioning part; 52. Lower positioning seat; 521. Lower limit part; 522. Lower connecting part; 523. Riveting part; 53. Compression spring; 6. First rod; 7. Second rod; 71. Pressure plate; 72. Conical cylinder. The best embodiment of the present invention

[0029] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0030] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and 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. Therefore, they should not be construed as limitations on this invention.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more, unless explicitly defined otherwise.

[0032] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0033] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] In the following embodiments, "up" and "down" refer to "up" and "down" in the normal sense. The direction that people face while sitting in the chair is "front" and the direction they turn away from is "back". The left hand is on the "left" side and the right hand is on the "right" side. The "left and right" direction is horizontal and the "front and back" direction is vertical. Example 1

[0035] As shown in Figures 1 to 11, a tray includes a base 2 for mounting support legs, a top seat 3 for mounting a chair seat, an elastic support 5 for driving the tray to reset, a cone 72 for mounting a gas spring, and a pressure plate 71 for controlling the gas spring.

[0036] The top seat 3 is located above the base 2. The front part of the top seat 3 and the front part of the base 2 are hinged by the hinge shaft 4. The rear part of the top seat 3 and the rear part of the base 2 are connected by the elastic support 5. The cone 72 is installed on the base 2 and is located between the hinge shaft 4 and the elastic support 5. The pressure plate 71 is installed on the base 2 in a swingable manner and is located above the cone 72. By driving the pressure plate 71, the air rod installed on the cone 72 can be controlled.

[0037] With this configuration, the hinge shaft is located at the front of the tray, the elastic support 5 is located at the rear of the tray, and the conical sleeve for mounting the gas spring is located between the hinge shaft and the elastic support 5. This creates a triangular structure formed by the first rod, the conical sleeve, and the hinge shaft, making the tray's connection and support structure more stable. In the above structure, the elastic support 5 allows the top seat to swing with the user's movements, making the tray more comfortable. In the above structure, the elastic support 5 is located inside the tray, making the tray's structure simpler and more aesthetically pleasing.

[0038] In this embodiment, as shown in Figures 2 to 5, a second rod 7 is also included. The second rod 7 is mounted on the base 2 and has multiple limiting positions on the base 2. The second rod 7 is located below the top seat 3. By adjusting the position of the second rod 7 on the base 2, the second rod 7 can abut against different parts of the top seat 3, thereby controlling the movement range of the top seat 3 through the second rod 7.

[0039] Further preferably, as shown in Figures 2, 3, 7, and 8, the second rod 7 is mounted on the base 2 in an axially movable manner. The bottom of the top seat 3 has multiple notches. By pulling the second rod 7, it can be engaged with different notches on the top seat 3, thereby adjusting the range of motion of the top seat 3. Specifically, as shown in Figures 2, 3, 7, and 8, the movement positions of the second rod 7 include a first limiting position and a second limiting position. The top seat 3 has a first notch 36 and a second notch 37, with the top of the second notch 37 higher than the top of the first notch 36. When the second rod 7 moves to the first limiting position, it can be inserted into the first notch 36; when the second rod 7 moves to the second limiting position, it can be inserted into the second notch 37.

[0040] In this embodiment, as shown in Figures 2 to 6, the base 2 is provided with an upward-opening receiving cavity 21, and the base 2 is also provided with a third through hole 26 that extends horizontally through the receiving cavity 21. The second rod 7 passes through the third through hole 26, and the pressure plate 71 is located inside the receiving cavity 21 and fixed to the second rod 7. With this configuration, the second rod 7 has the function of limiting the movement range of the top seat 3 and controlling the lifting and lowering of the gas spring. At the same time, the pressure plate 71 can also restrict the second rod 7 to the base 2, preventing the second rod 7 from detaching from the base 2.

[0041] In a further preferred embodiment, a second positioning protrusion 25 protrudes from the inner wall of the accommodating cavity 21, and a third through hole 26 penetrates the second positioning protrusion 25, through which the second rod 7 passes. The second positioning protrusion 25 effectively protects the base 2 and provides more support area for the second rod 7, thereby improving the strength and support stability of the tray.

[0042] In this embodiment, as shown in Figures 4 to 6, a first rod 6 is also fixed on the base 2. The first rod 6 is located above the pressure plate 71, between the second rod 7 and the hinge shaft 4, with the first rod 6 positioned above and in front of the second rod 7 and below and behind the hinge shaft 4. The hinge shaft 4, the second rod 7, and the first rod 6 effectively improve the structural strength of the base 2, and the first rod 6 prevents the pressure plate 71 from overturning excessively. Specifically, a second through hole 24 is provided on the base 2. The second through hole 24 extends laterally and penetrates the receiving cavity 21, through which the first rod 6 passes. The second through hole 24 serves to pre-position the rod and facilitate installation and manufacturing.

[0043] In this embodiment, the bottom of the top seat 3 is provided with a side wing 31, the two side wings 31 are symmetrically arranged, the base 2 is located between the two side wings 31, the base 2 and the side wings 31 are hinged by the hinge shaft 4, the first notch 36 and the second notch 37 are respectively provided on the two side wings 31, and the second rod 7 is located below the side wings 31.

[0044] Further preferably, as shown in Figures 2, 3, 7 and 8, the side wing 31 is provided with sliding holes 33, and the two ends of the first rod 6 protrude from the base 2. The two ends of the first rod 6 are respectively inserted into the sliding holes 33 of the two side wing 31. The ends of the first rod 6 can slide in the sliding holes 33, and the first rod 6 can abut against the top and bottom of the sliding holes 33, thereby limiting the maximum swing range of the top seat 3 and giving the top seat 3 initial pressure, preventing the user from leaning back significantly during the sitting process, and improving the stability of the tray support.

[0045] More preferably, the top seat 3 is provided with a clearance hole 38 extending in the vertical direction. The clearance hole 38 is located between the two side wings 31 and above the base 2. When the base 2 moves, the top of the base 2 can freely enter and exit the clearance hole 38, thereby making the tray thinner.

[0046] Further preferably, the side wing 31 is provided with a fourth through hole 32, and the base 2 is provided with a first through hole 22. The hinge shaft 4 passes through the fourth through hole 32 and the first through hole 22 to connect the base 2 and the top seat 3. Further, a bushing 41 is fitted onto the hinge shaft 4, passing through the first through hole 22. One end of the bushing 41 has a protruding spacer ring, which is located between the side wing 31 and the base 2. Further, a first positioning protrusion 23 protrudes from the interior of the receiving groove on the base 2. The first through hole 22 passes through the first positioning protrusion 23, and the bushing 41 passes through the first positioning protrusion 23.

[0047] In this embodiment, two sets of elastic elements are symmetrically arranged between the base 2 and the top seat 3, which can improve the stability of the tray support and provide the user with sufficient feedback force.

[0048] In this embodiment, as shown in Figures 4, 5, 9, 10 and 11, the elastic support 5 includes a compression spring 53, an upper positioning seat 51 and a lower positioning seat 52. The two ends of the compression spring 53 are respectively installed on the upper positioning seat 51 and the lower positioning seat 52. The upper positioning seat 51 is movably engaged with the top seat 3, and the lower positioning seat 52 is fixedly connected to the base 2.

[0049] Further preferably, as shown in Figure 8, the top seat 3 is provided with an arc-shaped groove 35. As shown in Figure 10, the upper positioning seat 51 has an arc-shaped upper positioning part 513 protruding from it. The upper positioning part 513 is inserted into the arc-shaped groove 35 and can rotate relative to the top seat 3. Furthermore, the inner diameter of the arc-shaped groove 35 is larger than the outer diameter of the upper positioning part 513. Furthermore, the arc-shaped groove 35 is formed by stamping, and after machining the arc-shaped groove 35, an arc-shaped protrusion 34 is formed on the top of the top seat 3. With this configuration, during the movement of the pallet, the contact point between the top of the elastic support and the top seat changes continuously, thereby keeping the compression spring as vertical as possible, providing more stable support for the top seat, reducing the failure frequency of the pallet, simplifying the connection structure between the elastic support and the top seat; and reducing the assembly difficulty of the pallet, making the pallet structure simpler.

[0050] Further preferably, as shown in FIG10, the upper positioning seat 51 includes an upper limit part 511, an upper positioning part 513 disposed at one end of the upper limit part 511, and an upper connecting part 512 protruding from the other end of the upper limit part 511. A compression spring 53 is sleeved on the upper connecting part 512, and the top of the compression spring 53 abuts against the upper limit part 511. Furthermore, the top surface of the upper limit part 511 is conical, and the upper limit part 511 is clearance-fitted with the top seat 3.

[0051] More preferably, the lower positioning seat 52 and the base 2 are riveted together. Specifically, the lower positioning seat 52 includes a lower limiting part 521, a riveting part 523 is provided below the lower limiting part 521, a lower connecting part 522 is provided above the lower limiting part 521, a compression spring 53 is sleeved on the lower connecting part 522, the bottom of the compression spring 53 abuts against the lower limiting part 521, and the riveting part 523 is riveted through a connecting hole 27 provided on the base 2.

[0052] In this embodiment, the top seat 3 is a rounded rectangle with a recessed middle section. The clearance hole 38, the arc groove 35, and the side wing 31 are all provided on the middle section of the top seat 3.

[0053] In this embodiment, the center of the top seat 3 is directly above the cone 72. During the movement of the pallet, the center of the top seat 3 moves directly above the cone 72, thus ensuring the stability of the pallet support. The center of the base 2 is located behind the center of the top seat 3, and the center of the base 2 is located behind the axis of the cone 72. When using the pallet, the force on the top seat 3 is often concentrated in the middle and rear positions. After adjusting the positioning positions of the top seat 3 and the base 2, the middle part of the base 2 can support the user under normal pallet use, making the pallet more stable. The second rod 7 and the first rod 6 are both located behind the center of the top seat 3; this can effectively and stably support the top seat 3.

[0054] In this embodiment, a mounting base 28 is fixed in the accommodating cavity 21 of the base 2. The top of the cone 72 extends out from the mounting base 28, and the bottom of the cone 72 extends out from the bottom of the base 2. The cone 72 is fixedly connected to the mounting base 28, thereby ensuring that the cone 72 has sufficient connection area with the tray and ensuring the stability and reliability of the connection between the cone 72 and the base 2.

[0055] In this embodiment, the pallet also includes a bottom shell 1, which has an upward-opening inner cavity. A base 2 is disposed inside the bottom shell 1, and a top seat 3 is located above the bottom shell 1. This makes the pallet more aesthetically pleasing and better protects its internal structure.

[0056] In the initial state, the elastic support 5 pushes the top seat 3 so that the first rod 6 abuts against the bottom of the sliding hole 33 on the side wing 31; when used for the pallet, the top seat 3 is forced downward to press the elastic support 5, and the first rod 6 slides in the sliding hole 33; wherein, when the first notch 36 or the second notch 37 on the side wing 31 abuts against the second rod 7, the top seat 3 stops moving.

[0057] A chair includes the aforementioned tray, with the top of a gas spring mounted on a cone, support legs mounted on the bottom of the gas spring, and a seat mounted on a top seat; a gas spring switch extends into the tray base and is located below a pressure plate, and rotating a second lever can drive the pressure plate to press down the gas spring switch, thereby adjusting the height of the chair. Embodiments of the present invention

[0058] Example 2

[0059] Unlike Embodiment 1, the first through hole 22 is elliptical, the inner hole on the side of the bushing 41 is circular, the outer wall of the bushing 41 is elliptical, and the major axis of the outer wall of the bushing 41 is shorter than the major axis of the first through hole 22.

[0060] More preferably, the length of the long shaft on the outer wall of the bushing 41 is smaller than the length of the short shaft on the first through hole 22.

[0061] The other structures in this embodiment are the same as those in Embodiment 1.

[0062] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions 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 one or more embodiments or examples.

[0063] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.

Claims

1. A tray, comprising a base (2) for mounting support legs, a top seat (3) for mounting a chair seat, an elastic support (5) for driving the tray to return to its original position, and a cone (72) for mounting a gas spring; characterized in that: The top seat (3) is located above the base (2). The front part of the top seat (3) and the front part of the base (2) are hinged by the hinge shaft (4). The rear part of the top seat (3) and the rear part of the base (2) are connected by the elastic support (5). The cone (72) is installed on the base (2) and is located between the hinge shaft (4) and the elastic support (5). The elastic support (5) includes a compression spring (53) and an upper positioning seat (51). The top of the compression spring (53) is installed on the upper positioning seat (51), and the bottom of the compression spring (53) is connected to the base (2). The top seat (3) is provided with an arc groove (35). The upper positioning seat (51) has an arc-shaped upper positioning part (513) protruding on it. The upper positioning part (513) is inserted into the arc groove (35) and the upper positioning part (513) can move relative to the top seat (3).

2. A pallet according to claim 1, characterized in that: It also includes a second rod (7) that is movably mounted on the base (2). The second rod (7) is located below the top seat (3). By pulling or rotating the second rod (7), the swing range of the top seat (3) can be adjusted or the lifting and lowering of the gas rod can be controlled.

3. A pallet according to claim 2, characterized in that: The second rod (7) has multiple limiting positions on the base (2). By adjusting the position of the second rod (7) on the base (2), the second rod (7) can be made to abut against different parts of the top seat (3), thereby controlling the range of motion of the top seat (3).

4. A pallet according to claim 3, characterized in that: The top seat (3) has a first notch (36) and a second notch (37), the top of the second notch (37) being higher than the top of the first notch (36); moving the second rod (7) allows the second rod (7) to connect with the first notch (36) or the second notch (37), thereby changing the lower limit of the range of motion of the top seat (3).

5. A pallet according to claim 2, characterized in that: A pressure plate (71) is fixed on the second rod (7). The pressure plate (71) is located above the cone (72). By rotating the second rod (7), the pressure plate (71) can be driven to swing and control the lifting and lowering of the air rod.

6. A pallet according to claim 1, characterized in that: The base (2) is fixed with a first rod (6), and the top seat (3) is provided with a sliding hole (33). The first rod (6) and the sliding hole (33) slide together. The elastic support (5) can push the top seat (3) so that the first rod (6) abuts against the bottom of the sliding hole (33), thereby limiting the upper limit of the swing of the top seat (3).

7. A pallet according to claim 6, characterized in that: A swingable pressure plate (71) is installed inside the base (2). The pressure plate (71) is located above the cone (72) and is used to control the lifting and lowering of the air rod. The first rod (6) is located above the pressure plate (71) and can limit the upper limit of the movement range of the pressure plate (71).

8. A pallet according to claim 1, characterized in that: The elastic support (5) also includes a lower positioning seat (52), the bottom of the compression spring (53) is mounted on the lower positioning seat (52), and the lower positioning seat (52) is mounted on the base (2).

9. A tray according to claim 1, characterized in that: The inner diameter of the arc groove (35) is larger than the outer diameter of the upper positioning part (513).

10. A chair, characterized in that: The pallet includes any one of claims 1-9, wherein the top of the gas spring is mounted on the cone (72), the support foot is mounted on the bottom of the gas spring, and the seat is mounted on the top seat (3).

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