Anti-toppling seat learning chair

Abstract

The utility model discloses an anti-toppling sitting learning chair. The anti-toppling sitting learning chair comprises a chair body and an anti-toppling device, the anti-toppling device comprises a filling chamber and a filling medium, the filling chamber is fixed to the bottom of the seat body, the filling medium is arranged in the filling chamber, and the filling medium can change the weight of the filling chamber so as to prevent the baby from toppling laterally after sitting on the seat body. The anti-toppling device is used for preventing the sitting learning chair from toppling, so that the sitting learning safety of a baby is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to learning chair production technical field, especially a kind of anti-toppling learning chair. BACKGROUND

[0002] Learning chair is a kind of appliance that lets baby learn to sit, generally soft texture, baby sits down after learning chair can provide certain auxiliary support to baby, guide baby to learn to sit. Some baby learning chairs of prior art are formed by plastic film inflation, the overall structure is relatively light and soft, can provide better cushioning effect for baby, and it is not easy to hurt baby. But the overall light and smooth surface of the existing inflatable learning chair, baby sits on the learning chair, and it is easy to tip over due to unstable center of gravity, which affects the personal safety of baby. SUMMARY

[0003] The utility model aims at at least one of the technical problems existing in prior art. To this end, the utility model provides an anti-toppling learning chair, which is provided with an anti-toppling device to prevent baby from tipping over after sitting on the learning chair.

[0004] According to the anti-toppling learning chair of the utility model embodiment, which comprises:

[0005] A seat body;

[0006] An anti-toppling device, comprising a filling chamber and a filling medium, the filling chamber is fixed to the bottom of the seat body, and the filling medium is arranged in the filling chamber, and the filling medium can change the weight of the filling chamber to prevent baby from tipping over after sitting on the seat body.

[0007] According to the anti-toppling learning chair of the utility model embodiment, at least the following beneficial effects are achieved:

[0008] The current learning chair is relatively light, and the center of gravity of baby is on the upper side when sitting on the learning chair, and it is easy to tip over due to unstable center of gravity when baby moves on the learning chair. After the filling medium of the utility model is filled in the filling chamber, the filling chamber has a certain weight, and the filling chamber is fixed to the bottom of the seat body, so that the center of gravity of the learning chair can be lowered. When baby sits on the learning chair, the overall center of gravity of baby and the learning chair will also be lowered, and even if baby moves the body on the learning chair, the overall center of gravity of baby and the learning chair will not deviate from the supporting surface of the learning chair, thereby preventing tipping over. For babies in this period of weak muscle strength and poor body coordination, it can avoid baby from being injured due to tipping over, and ensure the safety of baby when learning to sit.

[0009] According to the anti-toppling learning chair of the utility model embodiment, the surrounding wall of the filling chamber is made of film material, the filling chamber is provided with a water inlet assembly, and the filling medium can enter the filling chamber through the water inlet assembly, so as to facilitate the filling of the filling medium in the filling chamber or the discharge of the filling medium.

[0010] According to the anti-toppling learning chair, the water inlet assembly comprises a water inlet pipe and a water plug, the water inlet pipe is fixed on the filling chamber, the water inlet pipe is communicated with the filling chamber, the filling medium can enter the filling chamber through the water inlet pipe, the water plug is detachably connected with the water inlet end of the water inlet pipe, the water plug is used for plugging or discharging the water entering the filling chamber, the weight of the anti-toppling device can be quickly adjusted, and the learning chair can be quickly switched between the use state and the storage state.

[0011] According to the anti-toppling learning chair, the seat body comprises a cushion, the cushion is provided with a first air chamber, the filling chamber is arranged on the first air chamber, the first air chamber is provided with a first air inlet, and the first air inlet allows external air to enter the first air chamber, so that the first air chamber is convenient for filling or discharging gas.

[0012] According to the anti-toppling learning chair, the filling chamber is fixed in the first air chamber, the water inlet end of the water inlet pipe extends to the outside of the first air chamber, and the water inlet pipe is fixedly connected with the first air chamber, so that the filling chamber can be watered or drained through the water inlet end of the water inlet pipe outside the first air chamber, and the operation is easy.

[0013] According to the anti-toppling learning chair, the first air chamber is provided with a positioning block, one end of the positioning block is fixedly connected with the inner wall of the first air chamber, and the other end of the positioning block away from the inner wall of the first air chamber is fixedly connected with the outer wall of the filling chamber, so that the filling chamber is fixed at a specified position in the first air chamber, displacement of the filling chamber is avoided, and further prevention of side toppling of the baby after sitting on the chair is realized.

[0014] According to the anti-toppling learning chair, the filling chamber is arranged outside the first air chamber, and the outer wall of the filling chamber is fixedly connected with the outer wall of the first air chamber, so that the area of the bottom supporting surface of the learning chair is increased, and further prevention of side toppling is realized.

[0015] According to the anti-toppling learning chair, the seat body further comprises a backrest and a limiting structure arranged on the cushion, the backrest and the limiting structure are oppositely arranged, the backrest is used for supporting the back of the baby, and the limiting structure is used for preventing the baby from sliding forward.

[0016] According to the anti-toppling learning chair, the limiting structure comprises a limiting column and a limiting table arranged above the limiting column, the limiting column and the backrest are matched to limit the left and right movements of the legs of the baby, and the limiting table and the cushion are matched to limit the up and down movements of the legs of the baby.

[0017] According to an embodiment of the present invention, an anti-tipping school seat is provided with a limiting platform having a second air chamber and a second air inlet. The second air inlet allows outside air to enter the second air chamber, enabling independent control of the exhaust and inflation of the second air chamber, thereby controlling the volume of the limiting platform so that the infant can sit on the school seat.

[0018] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0020] Figure 1 This is a structural schematic diagram of an anti-tipping ergonomic chair according to the first embodiment of the present invention;

[0021] Figure 2 This is a side view of an anti-tipping ergonomic chair according to the first embodiment of the present invention;

[0022] Figure 3 for Figure 2 Sectional view of section AA;

[0023] Figure 4 This is a structural schematic diagram of an anti-tipping ergonomic chair according to the second embodiment of the present invention;

[0024] Figure 5 This is a structural schematic diagram of an anti-tipping ergonomic chair according to the third embodiment of the present invention;

[0025] Figure 6 This is a side view of an anti-tipping chair according to the fourth embodiment of the present invention.

[0026] Explanation of reference numerals in the attached figures:

[0027] Anti-tipping device 100; filling chamber 110; filling medium 120; water inlet assembly 130; water inlet pipe 131; water plug 132;

[0028] Seat cushion 200; First air chamber 210; First air inlet 220; First groove 230; Pressure ring 240; Positioning block 250; Footrest block 260;

[0029] Limiting structure 300; limiting post 310; limiting platform 320; annular limiting ring 321; limiting block 322; second air inlet 330; air exchange nozzle 331; air plug 332;

[0030] Backrest 400; Second recess 410. Detailed Implementation

[0031] The embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only, for the purpose of explaining the present application, and should not be understood as a limitation of the present application.

[0032] In the description of the present application, it should be understood that, in relation to the orientation description, for example, the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0033] In the description of the present application, the meaning of several is one or more, and the meaning of multiple is two or more. Greater than, less than, more than, etc. are understood as not including the number, and above, below, etc. are understood as including the number. If it is described as first, second, etc. is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of indicated technical features.

[0034] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. should be broadly understood, and the skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0035] Referring to Figures 1 to 3 The present application provides a kind of anti-toppling school chair, including seat body and anti-toppling device 100;Anti-toppling device 100 includes filling chamber 110 and filling medium 120, filling chamber 110 is fixed to seat body bottom, filling medium 120 is set in filling chamber 110. Filling medium 120 can change the weight of filling chamber 110, to prevent baby from sitting on seat body and side falling.

[0036] The current learning chair is light, and when the baby sits on the learning chair, the gravity center is close to the top, and the baby is easy to fall sideways when moving on the learning chair. The filling medium 120 is filled in the filling chamber 110, the filling chamber 110 has a certain weight, and the filling chamber 110 is fixed to the bottom of the seat body, so that the gravity center of the learning chair can be lowered. When the baby sits on the learning chair, the overall gravity center of the baby and the learning chair is also lowered, and even if the baby moves the body on the learning chair, the overall gravity center of the baby and the learning chair will not deviate from the supporting surface of the learning chair, thereby preventing the baby from falling sideways. For the baby in this period of weak muscle strength and poor body coordination, the baby can be prevented from being injured due to falling sideways, and the safety of the baby when learning to sit is ensured.

[0037] The filling chamber 110 can be arranged on the inner side of the bottom of the seat body to reduce the volume of the anti-falling learning chair and be more beautiful, or the filling chamber 110 is arranged on the outer side of the bottom of the seat body to increase the area of the supporting surface of the learning chair, or the filling chamber 110 is arranged below the bottom of the seat body.

[0038] As a preferred scheme, referring to Figure 1 , the filling chamber 110 of the anti-falling device 100 is arranged on the inner side of the bottom of the seat body, and the filling chamber 110 has a ring-shaped structure, which can uniformly distribute the weight of the anti-falling device 100 on the bottom of the seat body, and further improve the anti-falling function of the learning chair. The filling chamber 110 with a ring-shaped structure can avoid the baby's hips after sitting, and prevent the baby's hips from damaging the filling chamber 110, which is reliable and practical.

[0039] Further, the seat body includes a seat cushion 200, and a first groove 230 is arranged on the top surface of the seat cushion 200. The anti-falling device 100 with a ring-shaped structure is arranged around the first groove 230, and the first groove 230 is used to accommodate the baby's hips, so that the baby can sit more comfortably, and the position of the baby's hips can be limited to a certain extent, reducing the situation that the baby moves out of the learning chair, and further improving the anti-falling performance.

[0040] Optionally, the filling chamber 110 of the anti-falling device 100 can also have a semi-ring structure, and two semi-ring structure filling chambers 110 form a circular ring and are arranged on the inner side of the bottom of the seat body, which can also achieve the anti-falling function of the learning chair.

[0041] It can be understood that, referring to Figure 6In some other embodiments, the filling chamber 110 can be arranged outside the seat cushion 200, and the weight of the filling chamber 110 can be changed to prevent the baby from falling sideways after sitting on the seat body. Specifically, the seat cushion 200 is provided with a first air chamber 210, and the filling chamber 110 is arranged outside the first air chamber 210, and the outer wall of the filling chamber 110 is fixedly connected with the outer wall of the first air chamber 210. Specifically, as a preferred scheme, the filling chamber 110 is arranged outside the bottom side of the first air chamber 210, and the filling chamber 110 is in the form of a ring-shaped ring structure, which can lower the center of gravity of the learning chair while increasing the area of the bottom support surface of the learning chair, and further avoid the overall center of gravity of the baby and the learning chair from deviating from the support surface of the learning chair, thereby preventing the baby from falling sideways.

[0042] Optionally, the filling chamber 110 can be arranged outside the top side of the first air chamber 210, or the filling chamber 110 can be arranged outside the side of the first air chamber 210 while being arranged below the first air chamber 210, both of which can change the weight of the filling chamber 110 to prevent the baby from falling sideways after sitting on the seat body, which will not be described here again.

[0043] According to some embodiments of the present application, the surrounding wall of the filling chamber 110 is made of a film material, and the filling chamber 110 is provided with a water inlet assembly 130; the filling medium 120 can be water, oil or other liquids, or sand, stones, metals or other solids; specifically, the filling medium 120 is water, because water is easy to obtain and convenient to handle, the discharged water can be recycled, and the learning chair or the baby will not be polluted. Water can enter the filling chamber 110 through the water inlet assembly 130. Specifically, the water inlet assembly 130 is arranged on the side wall of the filling chamber 110, and the surrounding wall of the filling chamber 110 made of the film material will increase in volume when water is filled in, and will decrease in volume when water is discharged. When it is necessary to store or move the anti-toppling learning chair, the water can be discharged through the water inlet assembly 130 to reduce the weight and volume of the anti-toppling learning chair, thereby facilitating the movement; when it is necessary to use the anti-toppling learning chair by the baby, the water can be filled into the filling chamber 110 through the water inlet assembly 130 to increase the bottom weight of the anti-toppling learning chair, thereby lowering the center of gravity of the anti-toppling learning chair and ensuring the safety of the baby.

[0044] Further, the water inlet assembly 130 comprises a water inlet pipe 131 fixed on the filling chamber 110 and a water plug 132 detachably connected with a water inlet end of the water inlet pipe 131. The other end of the water inlet pipe 131 is in communication with the filling chamber 110, and water can enter the filling chamber 110 through the water inlet pipe 131. When the filling chamber 110 needs to be sealed to store water, the water plug 132 is only needed to be connected with the water inlet end of the water inlet pipe 131. When the filling chamber 110 needs to be filled with water or drained, the water plug 132 is only needed to be separated from the water inlet end of the water inlet pipe 131, and then the water inlet end of the water inlet pipe 131 is connected with an external pipeline. The water entering the filling chamber 110 is sealed or drained by the water plug 132, so that the weight of the anti-toppling device 100 can be quickly adjusted to quickly change the use state and storage state of the learning chair.

[0045] Optionally, the water inlet assembly 130 can be a one-way water inlet valve, which can keep the water filled in the filling chamber 110 for a long time, and has high reliability.

[0046] According to some embodiments of the present application, the seat cushion 200 is provided with a first air chamber 210, and the filling chamber 110 is arranged on the first air chamber 210. The first air chamber 210 is provided with a first air inlet 220 allowing external air to enter the first air chamber 210. The air is filled in the first air chamber 210 through the first air inlet 220, so that the seat cushion 200 becomes softer and has better cushioning, and the baby sitting on the learning chair is more comfortable, and the baby can be prevented from being injured by the seat cushion 200. Specifically, the first air inlet 220 is arranged on the side wall of the first air chamber 210, facilitating the inflation and deflation of the first air chamber 210.

[0047] Further, the filling chamber 110 is fixedly arranged in the first air chamber 210, and the water inlet pipe 131 is fixedly connected with the first air chamber 210. The water inlet end of the water inlet pipe 131 extends to the outside of the first air chamber 210. The filling chamber 110 is fixed in the first air chamber 210, and the first air chamber 210 can protect the film material of the filling chamber 110, improve the use reliability of the filling chamber 110, and be more beautiful. The water inlet end of the water inlet pipe 131 extends to the outside of the first air chamber 210, facilitating the water filling or draining of the filling chamber 110, and being easy to operate.

[0048] It should be noted that in other embodiments, the first air inlet 220 is a one-way air inlet valve, and the air entering the first air chamber 210 is not easy to leak, reducing the inflation frequency of the first air chamber 210, keeping the first air chamber 210 in a plump state for a long time, and avoiding accidents caused by the leakage of the first air inlet 220 when the baby uses the learning chair.

[0049] According to some embodiments of the present application, the first air chamber 210 is provided with a positioning block 250, one end of the positioning block 250 is fixedly connected with the inner wall of the first air chamber 210, and the other end of the positioning block 250 away from the inner wall of the first air chamber 210 is fixedly connected with the outer wall of the filling chamber 110. The position of the filling chamber 110 is fixed by using the positioning block 250, so that the filling chamber 110 is fixed at a specified position in the first air chamber 210, avoiding displacement of the filling chamber 110, further improving the stability of the center of gravity of the anti-toppling learning chair, and further preventing the baby from falling sideways after sitting on the learning chair. Referring to Figure 3 As a preferred solution, two positioning blocks 250 are provided, and the two positioning blocks 250 are oppositely arranged in the first air chamber 210, which better fixes the position of the filling chamber 110. Alternatively, the positioning block 250 can be provided in three or more, which fixes the position of the filling chamber 110 in multiple directions.

[0050] Alternatively, the first air chamber 210 can also be provided with a positioning strip, a positioning buckle or a positioning line, which can all achieve the purpose of fixing the position of the filling chamber 110.

[0051] According to some embodiments of the present application, the seat body further comprises a backrest 400 and a limiting structure 300, the backrest 400 and the limiting structure 300 are arranged on the seat cushion 200, the backrest 400 is oppositely arranged with the limiting structure 300, the backrest 400 is used to support the back of the baby, and the limiting structure 300 is used to prevent the baby from sliding forward and limit the baby on the learning chair.

[0052] Further, the top surface of the seat cushion 200 is further provided with a plurality of pressing rings 240, which can be made of plastic, metal or the surface material of the seat cushion 200 after solidification treatment. The pressing ring 240 can limit the expansion deformation of the surface material of the seat cushion 200, thereby limiting the height of the top surface of the seat cushion 200, avoiding the height of the top surface of the seat cushion 200 being too high due to excessive inflation of the first air chamber 210, affecting the baby's legs to be lifted too high, and affecting the use effect of the learning chair.

[0053] Further, the bottom surface of the seat cushion 200 away from the backrest 400 is connected with a stepping block 260, the stepping block 260 protrudes from the bottom surface of the seat cushion 200, when an adult needs to move the baby away from the learning chair, the adult can step on the stepping block 260 with his foot, and then lift the baby with his hand. Since the stepping block 260 is fixed by the adult's foot, and the stepping block 260 is connected with the seat cushion 200, the learning chair will not be lifted together with the baby when the adult lifts the baby, which facilitates the separation of the baby and the learning chair.

[0054] Further, the backrest 400 is provided with a second groove 410, which is used to avoid the backrest 400 protruding to the back of the baby, avoid the baby's spine appearing reverse arch, and improve the baby's sitting experience; the second groove 410 can also increase the contact area between the baby's back and the backrest 400, and improve the buffering effect of the backrest 400.

[0055] According to some embodiments of the present application, the limiting structure 300 includes a limiting column 310 and a limiting table 320 arranged above the limiting column 310. Specifically, the limiting column 310 is arranged at the position of the seat cushion 200 between the baby's legs after sitting down; the limiting table 320 is arranged at the position above the baby's legs after sitting down; the limiting column 310 and the backrest 400 cooperate to limit the left and right movement of the baby's legs, and the limiting table 320 and the seat cushion 200 cooperate to limit the up and down movement of the baby's legs.

[0056] Further, the limiting table 320 is provided with a second air chamber (not shown in the figure), which is provided with a second air inlet 330 allowing external air to enter the second air chamber. The second air chamber is not communicated with the first air chamber 210, and the exhaust and inflation of the second air chamber can be controlled separately by using the second air inlet 330, so as to control the volume of the limiting table 320. When the baby's leg circumference is larger, the second air chamber can be first exhausted, and then inflated after the baby sits on the chair, so as to well limit the baby's legs, and has strong compatibility and wide use.

[0057] Further, the limiting table 320 includes a ring-shaped limiting ring 321 and a limiting block 322 arranged below the ring-shaped limiting ring 321, the second air inlet 330 is arranged at the top of the limiting block 322, and the ring-shaped limiting ring 321 and the limiting block 322 together form the second air chamber inside. The second air inlet 330 is arranged in the ring-shaped limiting ring 321 to avoid the baby bumping into the second air inlet 330.

[0058] Further, the second air inlet 330 includes an air exchange nozzle 331 and an air plug 332, which can quickly block the air entering the second air chamber, and improve the inflation or exhaust efficiency of the second air chamber. Specifically, the ring-shaped limiting ring 321 can be reset by its own elasticity, and after the second air chamber is exhausted by pressing the ring-shaped limiting ring 321 with the hand, the ring-shaped limiting ring 321 can be automatically reset, and in the process of resetting, air is sucked through the second air inlet 330, and after the ring-shaped limiting ring 321 is reset, the air plug 332 can be plugged into the air exchange nozzle 331 to complete the inflation, which is convenient to operate and does not need tools.

[0059] Regarding the second embodiment of the limiting structure 300, as Figure 4As shown, the limiting structure 300 is a limiting column 310, which is used to prevent the baby from sliding forward. The structure is simple and facilitates the baby to sit down and stand up, realizing the sitting learning function of the baby, and improving the safety of the child sitting learning in cooperation with the anti-toppling device 100.

[0060] The application also provides a third embodiment of the limiting structure 300, as shown in Figure 5 As shown, the limiting structure 300 includes a limiting column 310 and a limiting table 320 arranged above the limiting column 310, and the two sides of the limiting table 320 extend to the two sides of the backrest 400 respectively, so that the limiting table 320, the limiting column 310, the seat cushion 200 and the backrest 400 enclose two holes to allow the baby's two legs to extend from the two holes respectively. Such a structure can better limit the left and right movement and up and down movement of the baby's legs, thereby further limiting the activity space of the baby, better avoiding the center of gravity of the baby and the anti-toppling sitting learning chair from deviating from the support surface, and improving the safety in cooperation with the anti-toppling device 100.

[0061] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0062] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. An anti-tip learning chair, characterized by, The application relates to a baby seat, which comprises: a seat body; an anti-tilting device (100) comprising a filling chamber (110) fixed to the bottom of the seat body and a filling medium (120) arranged in the filling chamber (110), wherein the filling medium (120) can change the weight of the filling chamber (110) to prevent the baby from tilting sideways after sitting on the seat body.

2. A tip-resistant learning chair according to claim 1, characterized in that The surrounding wall of the filling chamber (110) is made of a film material, and the filling chamber (110) is provided with a water inlet assembly (130), and the filling medium (120) can enter the filling chamber (110) through the water inlet assembly (130).

3. A tip resistant learning chair according to claim 2, characterized in that The water inlet assembly (130) comprises a water inlet pipe (131) fixed to the filling chamber (110) and a water plug (132) detachably connected to the water inlet end of the water inlet pipe (131).

4. A tip-resistant learning chair according to claim 3, characterized in that The seat body comprises a seat cushion (200) provided with a first air chamber (210), and the filling chamber (110) is arranged on the first air chamber (210), wherein the first air chamber (210) is provided with a first air inlet (220) allowing external air to enter the first air chamber (210).

5. A tip-resistant learning chair according to claim 4, wherein The filling chamber (110) is fixed in the first air chamber (210), the water inlet end of the water inlet pipe (131) extends to the outside of the first air chamber (210), and the water inlet pipe (131) is fixedly connected with the first air chamber (210).

6. A tip-resistant learning chair according to claim 5, wherein The first air chamber (210) is provided with a positioning block (250), one end of the positioning block (250) is fixedly connected with the inner wall of the first air chamber (210), and the other end of the positioning block (250) away from the inner wall of the first air chamber (210) is fixedly connected with the outer wall of the filling chamber (110).

7. A tip-resistant learning chair according to claim 4, wherein The filling chamber (110) is arranged outside the first air chamber (210), and the outer wall of the filling chamber (110) is fixedly connected with the outer wall of the first air chamber (210).

8. A tip-resistant learning chair according to claim 4, wherein The seat body further comprises a backrest (400) arranged on the seat cushion (200) and a limiting structure (300), wherein the backrest (400) and the limiting structure (300) are arranged oppositely, the backrest (400) is used for supporting the back of the baby, and the limiting structure (300) is used for preventing the baby from sliding forward.

9. A tip-resistant learning chair according to claim 8, wherein The limiting structure (300) comprises a limiting column (310) and a limiting table (320) arranged above the limiting column (310).

10. A tip-resistant learning chair according to claim 9, wherein The limiting table (320) is provided with a second air chamber, and the second air chamber is provided with a second air inlet (330) allowing external air to enter the second air chamber.

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