CN212630357U

CN212630357U - Limiting mechanism of chair for sitting and standing

Info

Publication number: CN212630357U
Application number: CN202021173267.8U
Authority: CN
Inventors: 叶金; 阮正富
Original assignee: UE Furniture Co Ltd
Current assignee: UE Furniture Co Ltd
Priority date: 2020-06-22
Filing date: 2020-06-22
Publication date: 2021-03-02
Anticipated expiration: 2030-06-22

Abstract

The utility model discloses a limiting mechanism of a chair for sitting and standing, which comprises a main support body, a side support body, a limiting part and a locking component, wherein the limiting part is arranged on the side support body, the locking component is arranged on the main support body, the limiting part has an unlocking state, a tiled locking state when the corresponding side support body is in a tiled state and an upright locking state when the corresponding side support body is in an upright state; the locking assembly comprises a limiting pull plate and a clamping plate, and a gap is reserved between the limiting pull plate and the clamping plate; the limiting piece is abutted against or clamped into the spacing with the clamping plate and the limiting pulling plate, so that the side support body is locked; compared with the prior art, the switching and locking of the sitting and standing chair in the sitting posture state or the standing posture state can be realized only by using the same limiting mechanism, the structure is simple, and the cost is saved; the structure design such as the spacing portion and the supporting portion on the locking piece and the spacing pulling plate and the clamping plate have gaps is ingenious, and meanwhile, the mechanism can be simplified.

Description

Limiting mechanism of chair for sitting and standing

Technical Field

The utility model relates to a seat field, in particular to stop gear of chair of sitting and standing.

Background

Office staff and students at school are more and more common in the situation of long-time sitting, the posture of the used common chair is difficult to adjust, and physiologically, one person stands for a long time, the leg load is too heavy, so that the person is easy to feel tired; people feel uncomfortable or tired after sitting for a long time, and various diseases such as hypomnesis, headache, dizziness, lumbar vertebra, cervical vertebra and the like are caused because of insufficient cerebral blood supply, the weight of the whole body is pressed on the bottom end of the vertebra and the like, so that the health is not good; therefore, in order to solve a series of problems caused by long-time sitting, people invent a sitting and standing chair which can be switched between sitting posture and standing posture, so that a user can ride or lean on the sitting and standing chair after sitting for a long time, and can sit down after riding or leaning too tired; if the chair of standing does not have firm stop gear, just the position of sitting state downside supporter is turned up just can appear, and the position of standing state downside supporter rocks, has the potential safety hazard, and how can lock the seat under position of standing state and the position of sitting state firmly, is the utility model discloses the problem that will solve.

Disclosure of Invention

In order to solve the technical problem, the utility model provides a limiting mechanism of a chair for sitting station, which comprises a main support body, a side support body, a limiting piece and a locking component, wherein the limiting piece is arranged on the side support body, the locking component is arranged on the main support body, the limiting piece has an unlocking state, a tiled locking state when the corresponding side support body is in a tiled state and an upright locking state when the corresponding side support body is in an upright state; the locking assembly comprises a limiting pull plate and a clamping plate, and a gap is reserved between the limiting pull plate and the clamping plate; the limiting part is abutted against or clamped into the spacing with the clamping plate and the limiting pulling plate, so that the side supporting body is locked.

The technical scheme of the utility model is realized like this:

a stop mechanism for a chair for sitting and standing comprising:

a main support body configured as a main body support of a seating surface;

the side supporting bodies are symmetrically arranged at the left side and the right side of the main supporting body and are rotationally connected with the main supporting body; the side supporting bodies have a flat laying posture and an upright posture, and the side supporting bodies can be turned upwards relative to the main supporting body from the flat laying posture to the upright posture;

the limiting piece is arranged on the side supporting body and rotates together with the side supporting body, and the limiting piece has an unlocking state and at least two locking states; in the unlocking state, the side support body can be turned over relative to the main support body; the locking state comprises a tiled locking state and an upright locking state, and the tiled locking state and the upright locking state are respectively the locking state when the side support body is in a tiled posture and an upright posture;

a locking assembly mounted on the main support, the locking assembly configured to lock the side support in a flat position or an upright position; the locking assembly comprises a limiting pull plate and a clamping plate; a space is reserved between the limiting pulling plate and the clamping plate; when the side supporting body overturns to a preset position relative to the main supporting body, the limiting piece is abutted against the clamping plate and the limiting pull plate or clamped into the interval, so that the side supporting body is locked.

The limiting mechanism locks the side supporting bodies when the side supporting bodies are in the flat laying posture and the vertical posture respectively, so that the sitting and standing chair can keep stable after the sitting and standing posture states are switched to support a user to sit.

Preferably, the sitting and standing chair has a sitting posture state and a standing posture state; in a sitting posture: the main supporting body and the side supporting bodies are both in a flat laying posture to form a seat surface for a user to sit flatly; standing posture state: the side supporting body rotates relative to the main supporting body and turns up to be in an upright posture; in a sitting posture state, the limiting part is supported by the limiting plate and is limited by the limiting pull plate to rotate, and the side supporting body is limited in a flat laying posture; in the standing state, the limiting part is limited in the interval between the limiting pulling plate and the clamping plate, and the side supporting body is limited in the vertical state; when the sitting posture state and the standing posture state are switched, the limiting piece is in an unlocking state.

Preferably, the limiting part is provided with a supporting part and a limiting part, the supporting part is attached to the upper surface of the clamping plate in a sitting posture state, the clamping plate supports the side supporting body and limits the side supporting body to turn downwards, one side of the limiting part is attached to the upper surface of the limiting pulling plate, and the limiting pulling plate limits the side supporting body to turn upwards; in the standing state, the supporting part is lifted to the upper part of the limiting part, the limiting part is positioned in the interval between the clamping plate and the limiting pulling plate, and the two sides of the limiting part are respectively attached to the clamping plate and the limiting pulling plate, so that the rotation of the side supporting body is limited. The clamping plate and the limiting pull plate are simple in matching mode with the limiting part, and the cost is reduced on the premise of ensuring the limiting effect.

Preferably, the limiting piece is a locking piece which is fixedly arranged at the front end part of the side supporting body, and the locking piece is rotatably connected with the main supporting body through a rotating shaft; the limiting pulling plate and the main support body can slide relatively. The switching between the unlocking state and the locking state of the locking piece is realized by the front-back sliding of the limiting pulling plate, the structure is simple, and the cost is low.

Preferably, the clamping plate protrudes forwards from the front end of the main support body, and when the limiting pulling plate slides forwards, the front end of the limiting pulling plate protrudes out of the front end of the main support body; the locking piece is rotationally connected with the front end of the main support body. The parts of the limiting pulling plate and the clamping plate protruding out of the front end of the main support body can limit the locking piece; the locking piece rotates with the side supporter is synchronous, when the locking piece is by the clamping plate and spacing arm-tie locking, has also accomplished the locking of offside supporter to the stability of position of sitting and the two kinds of states downside supporter of standing has been guaranteed.

Preferably, the limiting pulling plate is arranged below the main support body, a guide sliding groove is formed in the limiting pulling plate, a guide pin penetrates through the guide sliding groove, and the guide pin is fixedly connected with the main support body; the sliding of the limiting pull plate is driven by a limiting pull plate driving mechanism, and the limiting pull plate driving mechanism is arranged below the main support body and is configured to drive the limiting pull plate to slide along the guide sliding groove. Spacing arm-tie can be for main tributary supporter relative slip, and this makes when spacing arm-tie slides to the place ahead and protrusion in main tributary supporter, spacing arm-tie can play limiting displacement to the offside supporter, and when spacing arm-tie slided to the place behind and does not protrusion in main tributary supporter, the offside supporter can rotate to switch to tiling or upright gesture, realized the control of standing chair sitting posture state and standing posture state switching.

Preferably, the limiting pulling plate driving mechanism comprises a torsion spring, the torsion spring and the main support body rotate relatively, the torsion spring is provided with two torsion spring arms, one torsion spring arm is connected with the limiting pulling plate, and the other torsion spring arm enables the torsion spring to rotate through pulling of a pulling wire, so that the limiting pulling plate is driven to slide. The core of the limiting pulling plate driving mechanism is a torsion spring, so that the cost is low; the direction of force is changed through the torsion spring, so the operating parts in the limiting pulling plate driving mechanism can be arranged on the left side and the right side, and the operating parts are more convenient to control than the operating parts arranged in the front and the back.

Preferably, the device also comprises a return spring acting on the limiting pulling plate to assist the limiting pulling plate to return. The reset spring can lead the limiting pulling plate to automatically reset after one-time unlocking, and the side supporting body is continuously locked.

Adopted above-mentioned technical scheme the utility model discloses a design departure point, theory and beneficial effect are:

the utility model provides a limiting mechanism of a sitting and standing chair, compared with the prior art, the switching and locking of the sitting and standing chair in a sitting posture state or a standing posture state can be realized by only using the same limiting mechanism, the structure is simple, and the cost is saved; the structure design such as the spacing portion and the supporting portion on the locking piece and the spacing pulling plate and the clamping plate have gaps is ingenious, and meanwhile, the mechanism can be simplified.

Drawings

Fig. 1 is a schematic perspective view illustrating the conversion between the sitting posture state and the standing posture state according to the embodiment of the present invention;

fig. 2 is a schematic perspective view of the main support body and the side support body in a sitting posture state according to the embodiment of the present invention;

fig. 3 is a schematic view of the three-dimensional structure of the locking plate limited by the limiting pulling plate and the limiting plate in the sitting posture state of the present invention;

FIG. 4 is a schematic perspective view of the main support body rotatably connected to the side support body according to the embodiment of the present invention;

fig. 5 is a schematic perspective view of the main support body and the side support body in the standing position of the present invention;

fig. 6 is a schematic view of the three-dimensional structure of the locking plate limited by the limiting pulling plate and the limiting plate in the standing state of the embodiment of the present invention;

fig. 7 is a top view of the sitting and standing chair in the sitting position according to the embodiment of the present invention;

FIG. 8 is an enlarged view of a portion A of FIG. 3;

FIG. 9 is a partial enlarged view of portion B of FIG. 6;

fig. 10 is a schematic perspective view of a limiting mechanism according to an embodiment of the present invention.

The figures are numbered: a main support 1; a side supporter 2; an inner side 3; an outer side 4; a rotating shaft seat 5; a locking piece 6; a rotating shaft 7; a mounting plate 8; an auxiliary support body 9; a standing posture support part 10; a limiting mechanism 11; a limiting pulling plate 12; a position-clamping plate 13; a base 14; a return spring 15; a pull wire assembly 16; a torsion spring 17; a support portion 18; a stopper 19; a stay wire fixing seat 20; a plate base 21; a spring seat 22; a guide chute 23; a thin rod 24; a tailstock 25; a guide pin 26; a pull wire 27; a return mechanism 28; a limit ball 29; a stopper base 30; a connecting seat 31; a return spring 32; a lift air lever 33; five-star feet 34; a seat pan 35; a connecting rod 36; the outer contour lines 37; the spacing 38; a pull sleeve 39.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

In the description of the present invention, the term "at least one" means one or more unless explicitly defined otherwise. The terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The specific implementation manner of the utility model is as follows:

as shown in fig. 1, the utility model provides a chair for sitting and standing, comprising: the supporting device comprises a main supporting body 1 and side supporting bodies 2 which are symmetrically arranged at two sides of the main supporting body 1, and the main supporting body and the side supporting bodies are rotatably connected.

As shown in fig. 1 and 2, the main support 1 is a seat plate, a seat support assembly is disposed below the main support 1, the seat support assembly in this embodiment includes a lifting air rod 33, a five-star foot 34 and a seat bottom plate 35, the lifting air rod 33 is connected between the five-star foot 34 and the seat bottom plate 35, the main support 1 is connected to the upper end of the seat bottom plate 35, and the main support 1 can be lifted up and down through the lifting air rod 33.

The side support 2 is a plate-shaped body, and the side support 2 has an inner side 3 close to the main support 1 and an outer side 4 far from the main support 1 in the width direction, and the outer side 4 is the outer side edge of the side support 2, which is broadly the outer side edge area of the side support 2, and generally refers to a part capable of supporting a human body to sit in a standing posture.

The sitting and standing chair has a sitting posture state and a standing posture state; in a sitting posture: the main supporting body 1 and the side supporting bodies 2 are both in a flat-laying posture to form a seat surface for a user to sit flatly, and the seat surface can be a plane or a curved surface conforming to the human engineering; when the sitting posture state is converted into the standing posture state, the side supporting bodies 2 on the two sides are respectively turned upwards to be in the vertical posture, the vertical posture does not necessarily limit the side supporting bodies 2 to be kept strictly vertical to the horizontal plane, more means that the outer side edges 4 of the side supporting bodies 2 can be in a higher height after the side supporting bodies 2 are turned upwards, in the process of turning upwards, the main supporting body 1 can be kept fixed, and at the moment, the side supporting bodies 2 can meet the height using requirements of most people in the standing posture state under the vertical posture; when the side supporting body 2 is in the upright posture and cannot meet the sitting requirement of the human body in the standing posture, for example, the user is too high or short, the height of the main supporting body 1 can be controlled by the lifting air rod 33, so that the requirement of the user can be met.

The inner sides 3 of the side supports 2 may be rotatably connected to the left and right sides of the main support 1 by hinges, but in order to meet the requirement that the side supports 2 have a reasonable height after being turned upwards and enable the two side supports 2 to be drawn together so that a user can ride, the width of the main support 1 is generally reduced, which may make the contact surface between the main support 1 and the seat pan 35 small and difficult to arrange; in order to solve the problem, the rotation connection part of the main support body 1 and the side support bodies 2 is arranged at the position of the main support body 1, which is close to the inner side of the front end and the rear end of the main support body 1, so that the main support body 1 and the seat chassis 35 below the main support body 1 can keep enough contact area, the side support bodies 2 can be enabled to have reasonable height after being turned upwards, and meanwhile, the two side support bodies 2 can be closed as much as possible, so that a user can ride the chair conveniently.

The above-mentioned rotational connection is realized by: a connecting rod 36 is welded at the front and the rear of the side support body 2 respectively, and the connecting rod 36 is extended to the position near the inner side of the front and the rear ends of the main support body 1 along the width direction of the standing chair and is connected with the position through a rotating shaft 7 in a rotating way.

The above paragraphs describe the core idea of the present invention, and the purpose of seat conversion is achieved by the upward turning of the side supporting body 2; in practical use, in order to improve the comfort of use and the sitting posture of a human body in a standing posture state, the side supporting body 2 is optimally designed, specifically, as shown in fig. 2 and 5, the outer side edge 4 extends downwards to form a standing posture supporting part 10, the standing posture supporting part 10 is a bent plate which is in a tab shape and is provided with a curved surface, and the side supporting body 2 and the standing posture supporting part 10 are integrally formed; when the side supporting body 2 is turned up and fixed, the two standing supporting parts 10 are close together, and the standing supporting parts 10 are converted from a drooping state to a roughly horizontal state which is beneficial to supporting the human body, at the moment, the two standing supporting parts 10 form a saddle with a narrower width compared with the sitting position surface in the sitting position state, so that a user can sit on the saddle.

The above paragraphs illustrate the design of the present invention, and in practical use, the side support 2 needs to be limited in the sitting and standing positions, and the limiting manner can be various, and the following examples are as follows:

as shown in fig. 2-7, the main supporter 1 is provided with a rotating shaft seat 5 at the front and rear ends thereof, the side supporter 2 is connected with the rotating shaft seat 5 through a connecting rod 36, the same rotating shaft 7 is arranged on the rotating shaft seat 5 and the connecting rod 36 in a penetrating manner, one end of the connecting rod 36 is provided with a mounting plate 8, and the mounting plate 8 is fixedly connected to the lower surface of the side supporter 2 close to the inner side 3; the side support 2 drives the mounting plate 8 to rotate synchronously, so that the connecting rod 36 rotates around the rotating shaft 7.

The auxiliary supporting body 9 extends towards the middle of the main supporting body 1 from the front part of the side supporting body 2, the auxiliary supporting body 9 is used for increasing the seat depth, the side supporting body 2 and the auxiliary supporting body 9 form an L-shaped plate together when viewed from top to bottom in a sitting posture state, and an outer contour line 37 at the bending part of the formed L-shaped plate is arc-shaped, so that a person can ride on the seat more easily when the side supporting body 2 is in an upright posture; it is of course also possible to choose to extend the auxiliary support 9 only from the rear of the side support 2.

Or the auxiliary supporting body 9 can be extended from the front part and the rear part of the side supporting body 2 together, so that the side supporting body 2 and the auxiliary supporting body 9 form a U-shaped plate together; whether a U-shaped panel or an L-shaped panel is constructed, depending on the overall arrangement of the seat.

As shown in fig. 3, 6, 10, the rotation of the side supporter 2 is controlled by the limiting mechanism 11, the limiting mechanism 11 includes a limiting part and a locking assembly, the limiting part is the locking plate 6, the locking assembly includes a limiting pull plate 12, a clamping plate 13, a base 14 and a limiting pull plate driving mechanism, the base 14 is a plate-shaped body, the base 14 is fixed on the lower surface of the main supporter 1 through bolt connection, the clamping plate 13 extends forwards from the left and right sides of the base 14, the front end of the clamping plate 13 protrudes out of the front end of the main supporter 1, the limiting pull plate 12 is arranged between the two clamping plates 13, a space 38 is left between the limiting pull plate 12 and the clamping plate 13 in the width direction of the seat, and according to the limiting requirement, the front end of the limiting pull plate 12 protrudes out of the front end of the main supporter 1 and returns to the rear end of the main supporter 1.

Meanwhile, in order to simplify the mechanism, the locking sheet 6 and the connecting rod 36 at the front end of the main support body 1 are the same component, the locking sheet 6 is provided with a supporting part 18 and a limiting part 19, and the limiting pulling plate 12 and the clamping plate 13 limit the locking sheet 6 together so as to lock the side support body 2 in a flat laying posture or a vertical posture; specifically, as shown in fig. 3, 6, 8 and 9, in the sitting posture, the support portion 18 abuts against the upper surface of the position-limiting plate 13, the position-limiting plate 13 supports the side support 2 and limits the side support 2 to turn downward, one side of the position-limiting portion 19 abuts against the upper surface of the position-limiting pulling plate 12, the position-limiting pulling plate 12 limits the side support 2 to turn upward, and the side support 2 is locked in the flat-laid posture; when the sitting posture state is converted into the standing posture state, the limiting pulling plate 12 moves backwards and leaves the limiting part 19, so that the limiting part 19 is not blocked any more, and the side support body 2 can be turned upwards; in the standing position, the support part 18 is lifted above the limiting part 19, the limiting part 19 is positioned in the interval 38 between the clamping plate 13 and the limiting pulling plate 12, and two sides of the limiting part 19 are respectively attached to the clamping plate 13 and the limiting pulling plate 12, so that the rotation of the side support body 2 is limited, and the side support body 2 is locked in the upright position.

As shown in fig. 10, the limiting pulling plate 12 is driven by a limiting pulling plate driving mechanism, and the limiting pulling plate driving mechanism comprises a return spring 15, a pulling wire assembly 16 and a torsion spring 17; cutting and bending a pull wire fixing seat 20 and a plate seat 21 downwards on the base 14, wherein the pull wire assembly 16 is connected to the pull wire fixing seat 20; the lower surface of the base 14 is provided with a spring seat 22, the spring seat 22 is a bolt fixed on the base 14, the torsion spring 17 is sleeved on the spring seat 22, the torsion spring 17 can rotate around the spring seat 22, one end of the torsion spring 17 is connected with the limiting pulling plate 12, and the other end of the torsion spring 17 is connected with the pulling wire assembly 16; the limiting pulling plate 12 is provided with a section of guide sliding chute 23, the tail part of the limiting pulling plate extends to form a thin rod 24, and the reset spring 15 is sleeved on the thin rod 24; the lower surface of the base 14 is further provided with a tailstock 25, the tail part of the limiting pulling plate is in penetrating fit with the plate seat 21, the rear end of the thin rod 24 is inserted into the tailstock 25, the return spring 15 is located between the plate seat 21 and the tailstock 25, and the limiting pulling plate 12 is in sliding connection with the base 14 through a guide pin 26 penetrating in the guide sliding groove 23.

The pulling wire assembly 16 comprises a pulling wire 27, a pulling wire sleeve 39 and a control switch (not shown), wherein the pulling wire 27 pulls the torsion spring 17 to make the torsion spring 17 rotate around the center of the torsion spring 17; the pull wire 27 is provided with a return mechanism 28, the return mechanism 28 comprises a limiting ball 29 arranged at the tail end of the pull wire 27, a limiting seat 30 and a connecting seat 31 sleeved on the pull wire 27 and a return spring 32 arranged between the limiting seat 30 and the connecting seat 31, the limiting ball 29 is arranged in the limiting seat 30 at the same time, the limiting ball 29 cannot pass through the limiting seat 30, and the connecting seat 31 is used for connecting the return spring 32 and the torsion spring 17.

The control switch controls the action of the pull wire 27, the pull wire assembly 16 is pulled, the limiting ball 29 at the tail end of the pull wire 27 pushes the limiting seat 30 to compress the return spring 32, the elastic force generated by the compression deformation of the return spring 32 drives the torsion spring 17 to rotate, namely the torsion spring 17 is driven to rotate by the connecting seat 31, the torsion spring 17 pulls the limiting pull plate 12 to slide backwards along the guide sliding groove 23, and the return spring 15 is compressed; when the stay wire assembly 16 is loosened, the return spring 15 extends and recovers, the limiting pull plate 12 slides forwards to drive the torsion spring 17 to rotate reversely to the initial position, and the stay wire assembly 16 recovers.

As shown in fig. 3, 6, 8, 9, in the sitting position: the main supporting body 1 and the side supporting body 2 are both in a flat-laying posture to form a seat surface for a user to sit flatly, the standing posture supporting parts 10 are perpendicular to the left side and the right side of the seat surface, at the moment, the supporting parts 18 are attached to the upper surface of the clamping plate 13, the clamping plate 13 supports the side supporting body 2 and limits the side supporting body 2 to turn downwards, one side of the limiting part 19 is attached to the upper surface of the limiting pull plate 12, the limiting pull plate 12 limits the side supporting body 2 to turn upwards, and the side supporting body 2 is locked in the flat-laying posture; standing posture state: the side support body 2 rotates relative to the main support body 1 and enables the side support body 2 to be turned upwards to be in an upright posture, the outer side edge 4 of the side support body 2 is lifted, the two standing posture support parts 10 are close to and form a saddle with the auxiliary support body 9 to cater to a user to sit or lean against, the support part 18 is lifted to the upper side of the limiting part 19 at the moment, the limiting part 19 is positioned in the interval 38 between the clamping plate 13 and the limiting pull plate 12, two sides of the limiting part 19 are respectively attached to the clamping plate 13 and the limiting pull plate 12, so that the rotation of the side support body 2 is limited, the side support body 2 is locked in the upright posture, and when the height of the side support body 2 cannot meet the height requirement of the user, the lifting air rod 33 is controlled to lift or lower the main support body 1 and the side support body 2 in the upright posture, so that the proper standing posture seating height is achieved.

Claims

1. A stop gear of chair stands, its characterized in that includes:

a main support body configured as a main body support of a seating surface;

2. A stop mechanism for a chair for sitting as claimed in claim 1, wherein: the sitting and standing chair has a sitting posture state and a standing posture state; in a sitting posture: the main supporting body and the side supporting bodies are both in a flat laying posture to form a seat surface for a user to sit flatly; standing posture state: the side supporting body rotates relative to the main supporting body and turns up to be in an upright posture; in a sitting posture state, the limiting part is supported by the limiting plate and is limited by the limiting pull plate to rotate, and the side supporting body is limited in a flat laying posture; in the standing state, the limiting part is limited in the interval between the limiting pulling plate and the clamping plate, and the side supporting body is limited in the vertical state; when the sitting posture state and the standing posture state are switched, the limiting piece is in an unlocking state.

3. A stop mechanism for a chair for sitting as claimed in claim 2, wherein: the limiting part is provided with a supporting part and a limiting part, the supporting part is attached to the upper surface of the clamping plate in a sitting posture state, the clamping plate supports the side supporting body and limits the side supporting body to turn downwards, one side of the limiting part is attached to the upper surface of the limiting pull plate, and the limiting pull plate limits the side supporting body to turn upwards; in the standing state, the supporting part is lifted to the upper part of the limiting part, the limiting part is positioned in the interval between the clamping plate and the limiting pulling plate, and the two sides of the limiting part are respectively attached to the clamping plate and the limiting pulling plate, so that the rotation of the side supporting body is limited.

4. A stop mechanism for a chair for sitting as claimed in claim 1, wherein: the limiting piece is a locking piece which is fixedly arranged at the front end part of the side supporting body, and the locking piece is rotatably connected with the main supporting body through a rotating shaft; the limiting pulling plate and the main support body can slide relatively.

5. A stop mechanism for a chair as claimed in claim 4, wherein: the limiting pulling plate slides to the front, and the front end of the limiting pulling plate protrudes out of the front end of the main support body; the locking piece is rotationally connected with the front end of the main support body.

6. A stop mechanism for a chair as claimed in claim 4, wherein: the limiting pull plate is arranged below the main support body, a guide sliding groove is formed in the limiting pull plate, a guide pin penetrates through the guide sliding groove, and the guide pin is fixedly connected with the main support body; the sliding of the limiting pull plate is driven by a limiting pull plate driving mechanism, and the limiting pull plate driving mechanism is arranged below the main support body and is configured to drive the limiting pull plate to slide along the guide sliding groove.

7. A stop mechanism for a chair as claimed in claim 6, wherein: the limiting pulling plate driving mechanism comprises a torsion spring, the torsion spring and the main support body rotate relatively, the torsion spring is provided with two torsion spring arms, one torsion spring arm is connected with the limiting pulling plate, and the other torsion spring arm enables the torsion spring to rotate through pulling of a pull wire, so that the limiting pulling plate is driven to slide.

8. A stop mechanism for a chair as claimed in claim 6, wherein: the device also comprises a return spring acting on the limiting pulling plate to assist the limiting pulling plate to return.