CN113273837B

CN113273837B - Anti-tipping seat

Info

Publication number: CN113273837B
Application number: CN202110581176.0A
Authority: CN
Inventors: 戴龙飞
Original assignee: Dongguan Zhuo Ming Furniture Co ltd
Current assignee: Dongguan Zhuo Ming Furniture Co ltd
Priority date: 2021-05-27
Filing date: 2021-05-27
Publication date: 2023-02-28
Anticipated expiration: 2041-05-27
Also published as: CN113273837A

Abstract

The invention discloses an anti-tipping seat, which comprises a stool, a backrest and a sliding support piece, wherein the backrest is rotatably arranged on the stool, and the backrest can rotate relative to the stool to switch between an upright state and a backward leaning state; the sliding support piece can be arranged at the bottom of the seat stool in a sliding mode to be matched with the seat stool to form bottom support of the backrest, and the seat stool is provided with a connecting rod assembly which is respectively connected with the backrest and the sliding support piece; the seat stool is provided with a front end face and a rear end face along the length direction, and when the backrest rotates to a backward leaning state in an upright state, the backrest drives the sliding supporting piece to slide through the connecting rod assembly, so that the sliding supporting piece extends in the direction far away from the front end face of the seat stool to enlarge the bottom supporting area; when the backrest rotates to the upright state in the backward leaning state, the backrest drives the sliding support piece to slide through the connecting rod assembly, so that the sliding support piece contracts and retracts towards the direction close to the front end face of the seat stool. The sliding support is extended in a sliding manner to enlarge the area of the bottom support, so that the seat is prevented from tipping.

Description

Anti-tipping seat

Technical Field

The invention relates to the field of seats, in particular to an anti-tipping seat.

Background

When a person sits on the chair, if the person feels tired after a long time, the person wants to lie down and rest for a period of time. Therefore, a chair with a rotatable backrest, that is, an angle-changeable backrest, has been invented, and more commonly, such as a work chair, etc., the inclination angle of the backrest of the chair can be increased when people normally sit on the chair, and the inclination angle refers to an acute angle formed by the backrest and a horizontal plane, so that the backrest is upright and comfortable to lean against. If a seated person wants to lie for rest, the backrest only needs to be rotated backwards, the inclination angle of the backrest is reduced, the backrest is relatively flat, and the seated person can lie on the backrest for rest, so that the comfort of the seat is improved. However, the center of force applied to the seat by a person sitting or lying is different, so that the center of gravity of the seat and the person as a whole is changed along with the person sitting or lying, and the feet of the seat are fixed, so that the center of gravity of the seat is unstable, and the use of the person is affected.

The application number "201020219042.1" discloses a seat structure with a variable center of gravity, wherein a backrest can drive a seat cushion to move forwards in the process of backward rotation so as to adjust the center of gravity of the seat. However, the seat structure described above loses support at the bottom of the front end of the seat cushion after the seat cushion moves forward, and there is a certain risk for the user to sit down.

The application number of 200610027792.7 discloses a self-balancing electric wheelchair with a backward-bending protection wheel, wherein the seat structure is provided with the backward-bending protection wheel, and the seat structure plays a role in supporting and protecting the seat when the seat is bent backward, but the backward-bending protection wheel of the seat structure is exposed outside the seat all the time and is easy to collide and interfere with other objects.

The massage armchair seat adjusting mechanism with the application number of '201922195541.5' provides a massage armchair seat adjusting mechanism which comprises a bottom frame and a seat frame, wherein the seat frame can rotate relative to the bottom frame, a bottom support is formed by the bottom frame, and the whole volume of the bottom frame is too large to avoid the seat frame from being overturned.

Disclosure of Invention

In order to solve the above technical problems, an object of the present invention is to provide an anti-tipping seat that can prevent a seat frame from tipping when a backrest leans backward, and has a compact overall structure and is not likely to interfere with other components.

The technical scheme adopted by the invention is as follows:

an anti-tipping seat comprises a stool, a backrest and a sliding support piece, wherein the backrest is rotatably arranged on the stool, the backrest can rotate relative to the stool to switch between an upright state and a reclined state, and the backrest can stay at a designated position and keep relatively fixed with the stool during rotation; the sliding support piece can be arranged at the bottom of the seat stool in a sliding mode, the sliding support piece is matched with the seat stool to form bottom support of the backrest, and the seat stool is further provided with a connecting rod assembly which is respectively connected with the backrest and the sliding support piece; the seat stool is provided with a front end face and a rear end face along the length direction, and in the process that the backrest rotates from an upright state to a backward-leaning state, the backrest drives the sliding support piece to slide relative to the seat stool through the connecting rod assembly, so that the sliding support piece extends towards the direction far away from the front end face of the seat stool to enlarge the area of the bottom support; in the process that the backrest rotates to the upright state in the backward leaning state, the backrest drives the sliding support piece to slide relative to the seat stool through the connecting rod assembly, so that the sliding support piece contracts and retracts towards the direction close to the front end face of the seat stool.

In a further scheme, the connecting rod assembly comprises a first connecting rod, a second connecting rod and a third connecting rod, the head end of the first connecting rod is hinged with the bottom of the backrest, the tail end of the first connecting rod is hinged with the head end of the second connecting rod, and a hinge point where the tail end of the first connecting rod is hinged with the head end of the second connecting rod is a first hinge point; the second connecting rod is hinged with the seat stool, and a hinged point of the second connecting rod hinged with the seat stool is a second hinged point; the tail end of the second connecting rod is hinged to the head end of the third connecting rod, the tail end of the third connecting rod is hinged to the sliding supporting piece, a hinge point of the tail end of the second connecting rod and the head end of the third connecting rod is a third hinge point, and the second hinge point is located between the first hinge point and the third hinge point.

The direction of force has been changed through link assembly's structure, and when the back bottom was close to the preceding terminal surface of seat bench, through the link with the direction of force change for sliding support piece can be to the direction motion of keeping away from the preceding terminal surface of seat bench, because the back sets up at the rear end face of seat bench, so only sliding support piece is to the direction motion of keeping away from the preceding terminal surface of seat bench, just can avoid tumbling of seat.

In a further scheme, the second connecting rod is provided with a first connecting section and a second connecting section which are respectively arranged at two sides of a second hinge point along the length direction of the second connecting rod, the first hinge point is positioned at the first connecting section, the third hinge point is positioned at the second connecting section, and the first connecting section is bent relative to the second connecting section so that the second connecting rod forms a V-shaped structure. The problem that the mechanism cannot operate due to the fact that the hinged point of the head end of the first connecting rod and the bottom of the backrest is hinged to the first hinged point and the second hinged point are located on the same straight line is avoided.

In a further scheme, the sliding support piece comprises a transmission plate, the connecting rod assembly is hinged to the transmission plate, and a supporting roller is arranged at one end, away from the front end face of the seat, of the transmission plate.

Sliding friction is converted into rolling friction by the aid of the supporting rollers, friction force of the sliding supporting piece in the sliding process is reduced, and sliding is smooth.

In a further scheme, a guide piece is arranged on the seat stool, a guide channel penetrating through the head end and the tail end of the seat stool is arranged on the guide piece, the guide channel extends along the length direction of the seat stool, the transmission plate is located in the guide channel, and when the backrest rotates, the connecting rod assembly drives the transmission plate to slide in the guide channel. The guide channel on the guide piece plays a role in guiding the transmission plate, and the transmission plate is prevented from shaking left and right in the sliding process.

In a further scheme, the guide piece comprises a guide plate, two sides of the guide plate are bent upwards to form flanges, the guide channel is formed between the flanges on two sides, a limiting piece is further arranged between the flanges on two sides, the flanges on two sides are respectively located on the left side and the right side of the transmission plate, and the limiting piece is located above the transmission plate.

The limiting part is used for limiting the upper part of the transmission plate, and the transmission plate is prevented from being forced upwards by a certain direction when the transmission plate is driven by the connecting rod assembly to slide, so that the support roller cannot contact with the ground and loses the bottom support effect due to the fact that the transmission plate moves upwards.

In a further scheme, the locating part includes the axis of rotation, the axis of rotation runs through both sides turn-ups and can rotate for the turn-ups, the cover is equipped with the lantern ring in the axis of rotation, the outer wall of lantern ring with the last face of driving plate offsets.

Through axis of rotation and lantern ring for the locating part is guaranteeing to realize spacingly to the driving plate, and the friction between locating part and the driving plate is rolling friction, reduces frictional force, the slip of the driving plate of being convenient for.

In a further scheme, the seat comprises a supporting frame, the left side and the right side of the supporting frame are bent forwards to form two supporting arms, a seat frame is arranged between the two supporting arms, an accommodating cavity is formed below the seat frame by the two supporting arms, the connecting rod assembly is located in the accommodating cavity, and when the sliding supporting piece retracts towards the direction close to the front end face of the seat, the sliding supporting piece is partially or wholly located in the accommodating cavity.

Accomodate link assembly and part or holistic slide support piece through holding the chamber, not only play the guard action to link assembly and slide support piece, still reduced the whole volume of seat, also more pleasing to the eye simultaneously.

In a further scheme, a connecting frame is arranged at the bottom of the backrest, the left side and the right side of the connecting frame are bent forwards and extend to form two armrest arms, the two armrest arms are positioned on the left side and the right side of the seat and hinged with the side walls of the adjacent seats, and the armrest arms are higher than the seats; the backrest and the connecting frame rotate around a hinge point of the armrest arm and the seat stool so that the backrest is switched between an upright state and a reclining state.

Because the left side and the right side of the connecting frame are bent forwards and extend to form two arm supporting arms, a user can conveniently lean on the arm supporting frames, and the arm supporting arms rotate along with the backrest when the backrest rotates, so that the arm supporting frames can further conveniently lean on the arm of the user.

In a further scheme, an air rod is arranged on the seat, one end of the air rod is hinged to the seat, the other end of the air rod is hinged to the backrest, the air rod stretches and retracts to drive the backrest to rotate relative to the seat so as to switch between an upright state and a reclining state, and when the backrest rotates to a specified position, the air rod is locked to force the backrest and the seat to keep relatively fixed.

Advantageous effects

1. The backrest can rotate relative to the seat stool to switch between an upright state and a reclined state so as to meet the requirements of users on different leaning angles.

2. And in the process of rotation of the backrest, the gravity center of the seat can deviate backwards along with the backward leaning of the backrest, the backrest drives the sliding support piece to slide relative to the seat through the connecting rod assembly, and the sliding support piece extends towards the direction far away from the front end face of the seat to enlarge the area of bottom support, so that the problems of tipping of the seat and the like possibly caused by the deviation of the gravity center of the seat are avoided.

3. Meanwhile, the sliding support piece is driven by the connecting rod assembly to slide relative to the seat stool in the backrest rotating process, the sliding distance of the sliding support piece is determined according to the backrest rotating angle, and the corresponding bottom support area can be increased according to the backrest rotating angle in real time.

4. In addition, when the backrest rotates to the upright state, the sliding support piece is driven by the connecting rod assembly to contract and retract towards the direction close to the front end face of the seat stool, and the whole volume of the seat can be reduced.

5. The second connecting rod in the connecting rod assembly is not a linear connecting rod, and the first connecting section in the second connecting rod is bent relative to the second connecting section so that the second connecting rod forms a V-shaped structure. The problem that the mechanism cannot operate due to the fact that the first connecting rod and the second connecting rod are located on the same straight line in the rotating process of the connecting rod assembly is avoided.

Drawings

FIG. 1 is a schematic view of the anti-roll seat with the backrest upright;

FIG. 2 is an enlarged view of portion A of FIG. 1;

FIG. 3 is a side view of the anti-roll seat with the backrest upright;

FIG. 4 is a schematic view of the anti-toppling seat with the backrest in a reclined position;

FIG. 5 is a schematic view of the anti-toppling seat with the backrest in a reclined position from another viewing angle;

FIG. 6 is an enlarged view of portion B of FIG. 5;

FIG. 7 is a side view of the anti-roll seat with the backrest in a reclined position;

fig. 8 is a front view and a partial enlarged view of the anti-roll seat with the backrest in a reclined state.

The reference numbers in the schematic drawings illustrate:

1-stool, 2-backrest, 3-sliding support, 4-link, 5-armrest, 6-air rod, 7-support, 8-support, 9-seat, 10-base, 11-receiving chamber, 12-driving plate, 13-support roller, 14-link assembly, 15-first link, 16-second link, 17-third link, 18-first link, 19-second link, 20-first hinge point, 21-second hinge point, 22-third hinge point, 23-guide channel, 24-guide plate, 25-flanging, 26-limit, 27-rotation shaft, 28-collar, 29-beam, 30-link.

Detailed Description

For a further understanding of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings.

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

Referring to fig. 1-8, the present embodiment provides an anti-roll chair, which includes a seat 1, a backrest 2 and a sliding support 3, wherein the backrest 2 is rotatably disposed on the seat 1, such that the backrest 2 can rotate relative to the seat 1 to switch between an upright state and a reclined state. Specifically, the bottom of back 2 is provided with link 4 in this scheme, and the left and right sides of this link 4 all bends forward and extends and form two armrests 5, and two armrests 5 are located the left and right sides of stool 1 respectively and are articulated with adjacent stool 1 lateral wall. The backrest 2 and the connecting frame 4 can rotate around the hinge point of the armrest arm 5 and the stool 1, so that the backrest 2 can be switched between the upright state and the reclining state. Meanwhile, the arm support 5 is higher than the seat 1 so as to facilitate the arm of the user to lean against.

In the scheme, the backrest 2 can stay at a specified position required by a user in the rotating process and is kept relatively fixed with the seat 1. Specifically, the seat 1 is provided with an air rod 6, one end of the air rod 6 is hinged with the seat 1, and the other end of the air rod 6 is hinged with the back. More specifically, as shown in fig. 1 and 8, the seat 1 in this scheme includes a support frame 7, the left and right sides of the support frame 7 are both bent forward to form two support arms 8, a seat frame 9 and a bottom plate 10 are disposed between the two support arms 8, and an accommodating cavity 11 is formed between the seat frame 9 and the bottom plate 10 by the two support arms 8. The gas pole 6 is located and holds the chamber 11, plays the effect that shelters from the protection through both sides support arm 8 to gas pole 6, also more pleasing to the eye. Meanwhile, one end of the air rod 6 is hinged with the bottom plate 10, the other end of the air rod 6 is hinged with the connecting frame 4 connected with the bottom of the backrest 2, the air rod 6 stretches and retracts to drive the backrest 2 to rotate relative to the seat stool 1 so as to switch between an upright state and a reclining state, and after the backrest 2 rotates to a specified position, the air rod 6 is locked to enable the backrest 2 to stay at the specified position and keep relatively fixed with the seat stool 1.

The seat 1 has a front end face and a rear end face along the length direction thereof, the sliding support 3 is slidably disposed at the bottom of the seat 1, and the sliding support 3 cooperates with the seat 1 to form a bottom support of the backrest 2. In this embodiment, the sliding support 3 includes a driving plate 12, and a supporting roller 13 is disposed at one end of the driving plate 12 away from the front end surface of the seat 1. Meanwhile, the seat 1 is also provided with a connecting rod assembly 14, and the connecting rod assembly 14 is respectively connected with the backrest 2 and the sliding support piece 3. In the process that the backrest 2 rotates from the upright state to the reclining state, the backrest 2 drives the sliding support 3 to slide relative to the seat 1 through the connecting rod assembly 14, so that the sliding support 3 extends in the direction away from the front end face of the seat 1 to enlarge the area of the bottom support. When the backrest 2 rotates to the upright state in the reclining state, the backrest 2 drives the sliding support 3 to slide relative to the seat 1 through the connecting rod assembly 14, so that the sliding support 3 retracts in a direction close to the front end face of the seat 1.

As a specific embodiment, please refer to fig. 2-4, the connecting rod assembly 14 includes a first connecting rod 15, a second connecting rod 16 and a third connecting rod 17, wherein a head end of the first connecting rod 15 is hinged to the bottom connecting frame 4 of the backrest 2, a tail end of the first connecting rod 15 is hinged to a head end of the second connecting rod 16, and a hinge point of the tail end of the first connecting rod 15 and the head end of the second connecting rod 16 is a first hinge point 20. The second connecting rod 16 is hinged with the seat 1, and the hinged point of the second connecting rod 16 and the seat 1 is a second hinged point 21. And the tail end of the second connecting rod 16 is hinged with the head end of the third connecting rod 17, the tail end of the third connecting rod 17 is hinged with the driving plate 12 in the sliding support 3, the hinged point of the tail end of the second connecting rod 16 and the head end of the third connecting rod 17 is a third hinged point 22, wherein the second hinged point 21 is located between the first hinged point 20 and the third hinged point 22.

Referring to fig. 4-7, when the backrest 2 rotates from the upright position to the reclined position, the center of gravity of the seat shifts rearward with the recline of the backrest 2. The link 4 of back 2 bottom is turned back in step this moment, the head end that drives even first connecting rod 15 rotates and sinks, the tail end of first connecting rod 15 gives the forward pivoted effort of head end of second connecting rod 16 this moment (be to the preceding terminal surface pivoted effort of stool 1 promptly), second connecting rod 16 rotates around its self and stool 1 articulated second pin joint 21, make the tail end of second connecting rod 16 give the effort of a backward movement of third connecting rod 17, make third connecting rod 17 drive driving plate 12 and slide backward, make driving plate 12 drive the gyro wheel increase bottom sprag area of backward roll-off. Thereby avoiding tipping of the seat.

Referring to fig. 1-3, during the process of the backrest 2 rotating from the reclining position to the standing position, the center of gravity of the seat is reset along with the forward movement of the backrest 2, and there is no risk of the seat tipping. At this time, the connecting frame 4 at the bottom of the backrest 2 moves forward and resets synchronously, and drives the head end of the connected first connecting rod 15 to rotate and rise. At this moment, the tail end of the first connecting rod 15 provides a backward rotating acting force (i.e. an acting force to the rear end face of the seat 1) to the head end of the second connecting rod 16, the second connecting rod 16 rotates around a second hinge point 21 of the second connecting rod 16 and the seat 1, so that the tail end of the second connecting rod 16 provides a forward moving acting force to the third connecting rod 17, the third connecting rod 17 drives the driving plate 12 to slide forward, the driving plate 12 drives the roller to return to the initial position to coincide with the seat 1, the overall size of the seat is reduced, interference collision with other components is avoided, and convenience is brought to moving and carrying of the seat.

In order to avoid the mechanism from being disabled in the dead point occurring during the rotation of the connecting rod assembly 14, the second connecting rod 16 has a first connecting section 18 and a second connecting section 19 respectively disposed on both sides of the second hinge point 21 along the length thereof, as shown in fig. 2. The first hinge point 20 is located at the first connecting section 18, the third hinge point 22 is located at the second connecting section 19, and the first connecting section 18 is bent relative to the second connecting section 19 so that the second connecting rod 16 forms a V-shaped structure. If the second link 16 is a linear link, during the rotation of the link assembly 14, the first link 15 and the second link 16 are in the same straight line, and the force applied by the first link 15 to the second link 16 is in the length direction of the second link 16, so that the second link 16 cannot rotate or reversely rotate. And the first connecting section 18 bends relative to the second connecting section 19 to enable the second connecting rod 16 to form a V-shaped structure, so that the problem that the mechanism cannot operate due to the fact that the second hinge point 21 and the first hinge point 20 of the hinge point of the head end of the first connecting rod 15 and the bottom of the backrest 2 are located on the same straight line is solved. In the present embodiment, an included angle between the first connecting section 18 and the second connecting section 19 is an obtuse angle, so as to avoid interference between the first connecting rod 15 and the third connecting rod 17 when the backrest 2 leans back.

Meanwhile, the length of the second connection section 19 is longer than that of the first connection section 18. Since the length of the second connecting section 19 is longer than that of the first connecting section 18, when the second connecting section 19 and the first connecting section 18 rotate by the same angle, the rotation distance of the tail end of the second connecting rod 16 is greater than that of the head end of the second connecting rod 16. This means that when the backrest 2 rotates a certain angle, the first connecting rod 15 drives the head end of the second connecting rod 16 to rotate, even if the rotation angle is small, the tail end of the second connecting rod 16 can swing greatly, and the third connecting rod 17 drives the sliding support 3 to slide out and extend. The long second connecting rod 16 is not needed to be matched with the driving, and the whole volume of the connecting rod assembly 14 is greatly reduced.

In this scheme, the quantity of link assembly 14 is two, and two link assembly 14 are connected in order to drive the steady slip of driving plate 12 with the left and right sides of driving plate 2 respectively.

And preferably, the connecting rod assembly 14 is located inside the housing chamber 11 of the seat 1, together with the gas lever 6. As a specific embodiment, as shown in fig. 4, a cross beam 29 is disposed between the two support arms 8, and a connecting rod 30 is disposed on the cross beam 29. One end of the connecting rod 30 is connected with the cross beam 29, the other end of the connecting rod 30 is connected with the seat frame 9, and the second connecting rod 16 in the connecting rod assembly 14 is hinged with the connecting rod 30.

In this embodiment, when the sliding support 3 retracts toward the front end of the seat 1, the driving plate 12 of the sliding support 3 is located in the accommodating cavity 11, and the roller is exposed out of the accommodating cavity 11 to avoid interference with the bottom plate 10. It is of course also possible to vary the travel of the transmission plate 12 and to provide an escape groove in the base plate 10 so that the roller is also received in the receiving chamber 11.

The stool 1 is further provided with a guide member, the guide member is provided with a guide passage 23 penetrating through the head and the tail of the guide member, the guide passage 23 extends along the length direction of the stool 1, and the driving plate 12 of the sliding support member 3 is positioned in the guide passage 23. When the backrest 2 rotates, the connecting rod assembly 14 drives the transmission plate 12 to slide in the guide channel 23. The guide channel 23 on the guide piece can guide the transmission plate 12, so that the transmission plate 12 is prevented from shaking left and right in the sliding process.

Specifically, as shown in fig. 6 and 8, the guide member includes a guide plate 24, and the guide plate 24 is disposed on the base plate 10. Both sides of the guide plate 24 are bent upwards to form flanges 25, the guide channel 23 is formed between the flanges 25, a limiting part 26 is further arranged between the flanges 25, the flanges 25 are respectively positioned at the left side and the right side of the transmission plate 12 to form left and right limiting, and the limiting part 26 is positioned above the transmission plate 12 to form top limiting. The limiting piece 26 limits the position above the transmission plate 12, so that the transmission plate 12 is prevented from being forced upwards by a directional force given to the transmission plate 12 when the connecting rod assembly 14 drives the transmission plate 12 to slide, and the support roller 13 cannot contact the ground and loses the bottom support effect.

In this embodiment, the limiting member 26 includes a rotating shaft 27, the rotating shaft 27 penetrates through the two side flanges 25 and can rotate relative to the flanges 25, a collar 28 is further sleeved on the rotating shaft 27, and an outer wall of the collar 28 abuts against an upper plate surface of the transmission plate 12. Through axis of rotation 27 and lantern ring 28 for locating part 26 is guaranteeing to realize spacing to driving plate 12, and the friction between locating part 26 and the driving plate 12 is rolling friction, reduces frictional force, is convenient for the slip of driving plate 12.

The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.

Claims

1. An anti-toppling seat is characterized by comprising a stool, a backrest and a sliding support piece, wherein the backrest is rotatably arranged on the stool, the backrest can rotate relative to the stool to switch between an upright state and a backward-leaning state, and the backrest can stay at a specified position and keep relatively fixed with the stool during rotation; the sliding support piece is slidably arranged at the bottom of the seat stool, the sliding support piece is matched with the seat stool to form bottom support of the backrest, and the seat stool is also provided with a connecting rod assembly which is respectively connected with the backrest and the sliding support piece; the seat stool is provided with a front end face and a rear end face along the length direction, and in the process that the backrest rotates from an upright state to a backward-leaning state, the backrest drives the sliding support piece to slide relative to the seat stool through the connecting rod assembly, so that the sliding support piece extends towards the direction far away from the front end face of the seat stool to enlarge the area of the bottom support; in the process that the backrest rotates to the upright state in the backward leaning state, the backrest drives the sliding support piece to slide relative to the seat stool through the connecting rod assembly, so that the sliding support piece contracts and retracts towards the direction close to the front end face of the seat stool;

the connecting rod assembly comprises a first connecting rod, a second connecting rod and a third connecting rod, the head end of the first connecting rod is hinged with the bottom of the backrest, the tail end of the first connecting rod is hinged with the head end of the second connecting rod, and a hinge point of the tail end of the first connecting rod and the head end of the second connecting rod is a first hinge point; the second connecting rod is hinged with the seat stool, and a hinged point of the second connecting rod hinged with the seat stool is a second hinged point; the tail end of the second connecting rod is hinged with the head end of the third connecting rod, the tail end of the third connecting rod is hinged with the sliding supporting piece, a hinged point of the tail end of the second connecting rod and the head end of the third connecting rod is a third hinged point, and the second hinged point is positioned between the first hinged point and the third hinged point; the second connecting rod is provided with a first connecting section and a second connecting section which are respectively arranged at two sides of a second hinge point along the length direction of the second connecting rod, the first hinge point is positioned at the first connecting section, the third hinge point is positioned at the second connecting section, and the first connecting section is bent relative to the second connecting section to enable the second connecting rod to form a V-shaped structure;

the sliding support piece comprises a transmission plate, the connecting rod assembly is hinged with the transmission plate, and a support roller is arranged at one end, away from the front end face of the seat stool, of the transmission plate;

the seat comprises a supporting frame, the left side and the right side of the supporting frame are bent forwards to form two supporting arms, a seat frame is arranged between the two supporting arms, an accommodating cavity is formed below the seat frame by the two supporting arms, the connecting rod assembly is positioned in the accommodating cavity, and when the sliding supporting piece is retracted towards the direction close to the front end face of the seat, the sliding supporting piece is partially or wholly positioned in the accommodating cavity;

the seat stool is provided with an air rod, one end of the air rod is hinged with the seat stool, the other end of the air rod is hinged with the backrest, the air rod stretches and retracts to drive the backrest to rotate relative to the seat stool so as to switch between an upright state and a backward leaning state, and when the backrest rotates to a specified position, the air rod is locked to force the backrest and the seat stool to keep relatively fixed;

the bottom of the backrest is provided with a connecting frame, the left side and the right side of the connecting frame are bent forwards and extend to form two arm supporting arms, the two arm supporting arms are positioned on the left side and the right side of the seat and hinged with the side walls of the adjacent seats, and the arm supporting arms are higher than the seats; the backrest and the connecting frame rotate around a hinge point of the armrest and the seat stool so that the backrest is switched between an upright state and a reclining state.

2. The anti-tipping seat according to claim 1, wherein the seat is provided with a guide member, the guide member is provided with a guide channel penetrating through the head and the tail of the seat, the guide channel extends along the length direction of the seat, the transmission plate is located in the guide channel, and when the backrest rotates, the connecting rod assembly drives the transmission plate to slide in the guide channel.

3. The anti-toppling seat according to claim 2, wherein the guiding member comprises a guiding plate, both sides of the guiding plate are bent upward to form flanges, the guiding channel is formed between the flanges, a limiting member is further disposed between the flanges, the flanges are respectively located at the left and right sides of the driving plate, and the limiting member is located above the driving plate.

4. The anti-toppling seat according to claim 3, wherein the limiting member comprises a rotating shaft, the rotating shaft penetrates through the two side flanges and can rotate relative to the flanges, a collar is sleeved on the rotating shaft, and the outer wall of the collar abuts against the upper plate surface of the transmission plate.