CN112369855B - Sitting standing chair and sitting standing posture switching method - Google Patents

Abstract

The utility model discloses a sitting and standing chair and a sitting and standing posture switching method, wherein the chair comprises a main support body configured as a main body support, a seat support body rotationally connected with the main support body and a back support body fixedly connected with the seat support body; the seat support and the back support are configured to be positionable in a sitting position and a standing position; the back support body is provided with a front support surface for being attached to the waist of a human body in a sitting posture state and a rear support surface for being ridden by the human body in a standing posture state; the method comprises three steps of unlocking, overturning and locking, wherein the unlocking or locking is realized by leaving or entering the locking hole through the locking handle; compared with the prior art, the chair can realize sitting and standing posture switching, the turnover seat support body can be switched to a standing posture state, and a user rides on the chair in the standing posture so as to relieve discomfort caused by long-time sitting; the sitting standing chair is convenient to operate when switching sitting postures; the chair directly reaches a proper and comfortable sitting height after the sitting and standing postures are switched, and time is wasted without excessive adjustment.

Description

Sitting standing chair and sitting standing posture switching method

Technical Field

The utility model relates to the field of office furniture, in particular to a sitting and standing chair and a sitting and standing posture switching method.

Background

The seat is widely used in modern study and work, and has the function of sitting for most office chairs or study chairs; from a physiological aspect, a person stands for a long time and is overloaded in legs, so that the person is easy to feel tired; people who sit for a long time feel uncomfortable or tired, and various diseases such as hypomnesis, headache and dizziness, lumbar vertebra and cervical vertebra and the like are caused by insufficient cerebral blood supply, weight of the whole body pressing on the bottom end of the vertebra and the like, so that the health is not good. Sedentary adverse physical conditions have been studied and reported for a long time in which one person wishes to sit and for a long time to stand.

Among sedentary people, it seems that office white collar and students who learn in school sit for the longest time, and they sit for work or learning almost all the day over the hour, and it is difficult to adjust the posture, and not only is the person easily tired, but also the body is easily affected. The solution to this problem is preferably to allow alternating "sitting" and "standing" of the person.

Therefore, there is an urgent need in the market for a sitting chair, in which a user can work in a sitting posture and can sit on the chair for office work, so as to relieve the pressure caused by sedentary sitting.

The utility model patent of China (CN201420232000. X) discloses a sitting and standing combined chair, which comprises a chair surface and a supporting part for supporting the chair surface, wherein the supporting part is provided with a supporting rod, the supporting rod is movably connected with the chair surface, the chair further comprises a swinging piece and a telescopic mechanism connected with the supporting part, one end of the swinging piece is movably connected with the chair surface, and the other end of the swinging piece is connected with the telescopic mechanism. The sitting and standing combined chair can truly realize the switching between sitting postures and standing postures, but in terms of comfort, the sitting and standing combined chair has no chair back in a sitting posture state, the waist and back of a user cannot be supported, and the comfort is low; the sitting and standing combined chair has no sitting surface in a standing state, so that a user can only lean on the chair, the comfort is poor, and the chair is not suitable for people with large weight, because toppling can occur when leaning on the chair.

Disclosure of Invention

In order to solve the technical problems, the utility model provides a sitting standing chair, which is connected with a main support body in a rotating way, so that the sitting standing chair has a sitting posture state in which a user can sit on the sitting support body flatly and a standing posture state in which the user can sit on a back support body.

The sitting posture switching method based on the sitting posture chair is characterized in that the locking handle enters or leaves the locking hole to lock or unlock the relative rotation between the seat support body and the main support body, and when the locking handle leaves the locking hole, the seat support body and the back support body can be switched from the current state (sitting posture or standing posture state) to the other state through the relative rotation with the main support body; when the locking handle enters the locking hole, the seat support and the main support are prevented from rotating relatively, so that the seat support and the back support stay in the current state.

The technical scheme of the utility model is realized as follows:

a sitting and standing chair comprising:

a main support configured as a main support of the seating chair;

the seat support body is rotationally connected with the main support body;

the back support body is fixedly connected with the seat support body relatively, and the seat support body and the back support body are configured to be positioned in at least one sitting posture state and at least one standing posture state; the back support body is provided with a front support surface for being attached to the waist and the back of a human body in a sitting posture state and a rear support surface for being ridden by the human body in a standing posture state;

in a sitting posture state, the seat support body is in a horizontal state and is used for bearing a human body to sit, and the front support surface of the back support body faces forwards and is used for supporting the waist and back of the human body; in the standing state, the back support body overturns around the main support body along with the seat support body and enables the rear support surface to face upwards to form a seat surface for a user to ride, and at the moment, the seat support body is in a vertical or inclined downward state.

The sitting posture of the sitting and standing chair can be switched by only turning the seat support body, and the operation is simple and convenient; the back support body can be used for supporting the waist and the back of a human body in a sitting posture state and is also used for supporting the human body in a standing posture state, and the back support body benefits from the fact that the front support surface and the rear support surface of the back support body meet the functions of the back support body when in design, and the overall structural design is ingenious.

Preferably, in the standing position, the back support body has a saddle shape with a lower middle and a higher front and rear. Through the curved surface design to the back supporting surface, the saddle form can the user can ride on the back support body with comfort when, can prevent again that the user from riding the back support body of forward or backward landing when sitting, compromise travelling comfort and security.

Preferably, the rear support surface of the back support body is provided with a fitting surface for fitting the inner side of the thigh, and in the standing state, the fitting surface is a smooth cambered surface which is inclined forwards and downwards. The fitting surface conforms to the ergonomic design, and further improves the comfort of a user riding on the back support.

Preferably, the back support body is fixedly connected to the rear end of the seat support body, and when the sitting posture state is switched to the standing posture state, the rear end of the seat support body is turned over forwards and upwards, and the rear support surface of the back support body is lifted and turned over to enable the rear support surface to meet the riding sitting of a human body compared with the seat support body; in the sitting position, the crotch point is above the seat support, in the standing position, the crotch point is above the back support, and the crotch point in the standing position is 220mm-320mm higher than the crotch point in the sitting position. The crotch point is a common reference point in the design of automobile seats and refers to the connection point between the trunk and the thighs of a human body in a two-dimensional or three-dimensional human body model sample plate; the design of corresponding lifting sitting surface height when the sitting posture is switched enables the sitting standing chair to directly reach a proper and comfortable sitting height after the switching is completed, the operation is simple and convenient, the sitting standing chair is more suitable for young people who are busy in working, time is wasted without excessive adjustment, the sitting posture and standing posture can be switched, and the negative influence of long-time sitting on the body is reduced.

Preferably, a rotation locking mechanism is arranged between the seat support body and the main support body, and comprises a bottom shell which is relatively fixed with the main support body and a bracket which is relatively fixed with the seat support body; the bracket is selectively rotatably arranged on the bottom shell, and the rotation locking mechanism further comprises a locking component which can prevent the bracket and the bottom shell from rotating relative to each other in a sitting state or a standing state. The switch for switching the sitting and standing postures is integrated into the chassis, the structure is ingenious, unnecessary peripheral components are reduced, the appearance of the sitting and standing chair is more concise and attractive, the cost is reduced, and the production and assembly efficiency is improved.

Preferably, the locking assembly comprises a locking piece and at least two locking positions, the locking piece is a locking handle arranged on the bottom shell and the bracket, the locking positions are locking holes formed on the bottom shell or the bracket, and the locking handle can selectively enter the locking holes; the locking handle and the locking hole are configured such that the locking handle is inserted into the locking hole, and the mutual rotation of the bottom chassis and the bracket is locked. The locking handle and the locking hole are matched and operated simply and conveniently, and the cost is low.

Preferably, the bracket comprises a rotary connecting plate at the left side and the right side, and the bottom shell is arranged between the two rotary connecting plates and is rotationally connected with the rotary connecting plates through a rotating shaft; one rotating connecting plate is provided with a waist hole for avoiding a locking handle, and the other rotating connecting plate is provided with two locking holes, namely a sitting posture locking hole and a standing posture locking hole; when the rotary seat support body is turned over to enable the bracket to rotate relative to the bottom shell, the locking handle moves in the waist hole; the locking handle enters the sitting posture locking hole and prevents the bracket from rotating relative to the bottom shell, and the back support body and the seat support body are positioned in a sitting posture state; the locking handle enters the standing position locking hole and prevents the bracket from rotating relative to the bottom shell, and the back support body and the seat support body are positioned in the standing position.

Preferably, the bottom shell comprises two vertically arranged mounting plates at the left side and the right side, the two mounting plates are provided with handle mounting holes, and the locking handles are arranged in the handle mounting holes in a sliding manner along the left-right direction.

Preferably, the main support comprises supporting legs and supporting columns, the upper ends of the supporting columns are inserted into the bottom shell, and the lower ends of the supporting columns are connected with the supporting legs; an outer cover for surrounding the bottom shell and the bracket is arranged below the seat support body, and the outer cover is synchronously and rotatably connected with the seat support body; the middle part of the outer cover is provided with a long groove for avoiding the support column, and when the seat support body and the main support body rotate relatively, the seat support body avoids the support column by using the long groove. The outer cover is smoothly connected with the lower surface of the seat support body, so that the integration, the aesthetic property and the safety of the chair are improved.

A sitting posture switching method based on the sitting posture chair comprises three steps of unlocking, overturning and locking:

first, unlocking: when the sitting and standing chair is in a sitting or standing state, the locking handle is inserted into one of the two locking holes; the locking handle is pulled out of the locking hole to unlock, and the seat support body can rotate relative to the main support body;

second, turning: applying a force to the seat support or back support to rotate the seat support relative to the main support and to rotate the locking handle into alignment with the other locking aperture;

thirdly, locking: the locking handle is inserted into the currently aligned locking holes to complete locking, and the sitting position and standing position of the sitting position chair are switched.

The design starting point, the idea and the beneficial effects of the utility model adopting the technical scheme are as follows:

the beneficial effects of the utility model are as follows:

1. the sitting standing chair can realize sitting standing posture switching, when a user feels untimely caused by sitting for a long time, the turnover seat support body and the back support body are switched to standing posture states, and the user rides on the sitting standing chair in standing posture so as to relieve discomfort caused by sitting for a long time and protect the health of a person sitting for a long time.

2. The sitting and standing chair has the advantages that the structure is simple, the overall appearance is not different from that of a common chair, the sitting and standing chair is even more simple, and meanwhile, the production cost is reduced; the simple structure of the sitting and standing chair makes the operation of switching sitting and standing postures more convenient.

3. The design of corresponding lifting sitting surface height when the sitting posture is switched makes the sitting standing chair directly reach a proper and comfortable sitting height after the switching is completed, the operation is simple and convenient, the sitting standing chair is more suitable for young people who are busy in working, the time is wasted without excessive adjustment, the sitting posture and the standing posture can be switched, and the negative influence of long-time sitting on the body is reduced.

4. Compared with the existing sitting and standing combined chair, the sitting and standing chair is provided with the back support body, so that the waist and the back of a human body can be effectively supported in a sitting posture state, and the use comfort of the chair is improved; when the chair is switched to a standing state, a user can ride on the back support body of the chair, and meanwhile, the saddle-shaped design of the back support surface enables the user not to slide back and forth, so that the comfort, stability and safety are improved, more people can be applied, and the weight is not limited any more.

Drawings

FIG. 1 is a side view of a sitting position and standing position transition in an embodiment of the present utility model;

FIG. 2 is a schematic perspective view of the sitting chair in a sitting position according to the embodiment of the utility model;

FIG. 3 is a schematic perspective view of the standing chair in the standing position switching process according to the embodiment of the utility model;

FIG. 4 is a schematic perspective view of the sitting and standing chair in a standing position according to the embodiment of the utility model;

FIG. 5 is a schematic perspective view of a standing chair according to an embodiment of the present utility model;

FIG. 6 is a diagram showing the crotch point in a sitting position versus standing position according to an embodiment of the present utility model;

FIG. 7 is an exploded view of the chair in an embodiment of the utility model;

FIG. 8 is an exploded view of a rotational locking mechanism in an embodiment of the utility model;

fig. 9 is a side view of the bottom shell and the bracket in a seated position according to an embodiment of the present utility model;

fig. 10 is a sectional view of the bottom chassis and the bracket in a seated state in the embodiment of the present utility model;

fig. 11 is a schematic perspective view of a bottom case and a bracket in a standing state according to an embodiment of the present utility model;

fig. 12 is a sectional view of the bottom chassis and the bracket in a standing state in the embodiment of the present utility model;

FIG. 13 is a cross-sectional view of the locking end inserted into the locking aperture in an embodiment of the present utility model;

fig. 14 is a cross-sectional view of the locking end of the present utility model exiting the locking aperture in an embodiment.

The reference numerals are as follows: a main support 1; a seat support body 2; a back support 3; a front support surface 4; a rear support surface 5; five star feet 6; a lifting air bar 7; a bonding surface 8; a bottom case 9; a bracket 10; a fixed ear 11; a locking handle 12; a control unit 12a; a locking end 12b; a locking hole 13; a sitting posture locking hole 13a; a standing position locking hole 13b; rotating the connection plate 14; a rotating shaft 15; a mounting plate 16; a handle mounting hole 17; an air bar lifting pressing sheet 18; a riser 18a; a cross plate 18b; a gas lever mounting hole 19; a waist hole 20; a housing 21; square grooves 22.

Detailed Description

In order that the above-recited objects, features and advantages of the present utility model will be more clearly understood, a more particular description of the utility model will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.

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

In the description of the present utility model, the term "at least one" refers to 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 embodiments of the present utility model are as follows:

as shown in fig. 1, the present utility model provides a sitting and standing chair, comprising a main support body 1, a seat support body 2 and a back support body 3, wherein the main support body 1 is configured as a main body support of the sitting and standing chair, and the seat support body 2 is rotatably connected with the main support body 1; the back support body 3 is fixedly connected with the seat support body 2 relatively, and the seat support body 2 and the back support body 3 are configured to be positioned in at least one sitting posture state and at least one standing posture state; the back support 3 has a front support surface 4 for fitting the waist of a human body in a sitting posture and a rear support surface 5 for riding the human body.

In this embodiment, the main support 1 includes supporting feet and supporting columns, the supporting feet and the supporting columns generally refer to five-star feet 6 and lifting air bars 7 of a standing chair, the seat support 2 refers to a chair seat, and the back support 3 refers to a chair back; the sitting posture state and the standing posture state refer to the state that when the seat support body 2 and the back support body 3 are positioned in the sitting posture state, the seat support body 2 is in a horizontal state, and a user can sit on the sitting standing chair flatly; when the seat support body 2 and the back support body 3 are positioned in a standing state, the seat support body 2 is in a vertical or inclined downward state, the whole back support body 3 is in a horizontal state, and a user can sit on the seat or straddle the seat; the sitting posture is configured in such a way that the back support body 3 is turned forward to an upright posture along with the seat support body 2 relative to the main support body 1, the seat support body 2 supports a human body, the front support surface 4 faces forward, and the back support body 3 supports the waist and the back of the human body; the standing state is configured that the back support body 3 is turned over to be tiled along with the seat support body 2, the back support surface 5 faces upwards and forms a seat surface for a user to ride, and at the moment, the back support body 3 supports a human body.

As shown in fig. 1 to 5, specifically, the seat support body 2 and the back support body 3 are integrally formed, so that when the seat support body 2 and the main support body 1 are turned over, the seat support body 2 and the back support body 3 can be kept relatively fixed, that is, the back support body 3 rotates along with the turning over of the seat support body 2; when the back support body 2 is switched to a standing state, the front end of the back support body 2 rotates downwards, the rear end of the back support body 3 is lifted upwards along with the rear end of the back support body 2, and the back support body 2 is connected to the rear end of the back support body 2 until the rear support surface 5 of the back support body 3 is saddle-shaped with low middle and high front and rear; the back support body 3 in this state has a back support surface 5 facing upward, the back support surface 5 has an attaching surface 8 for attaching the inner side of the thigh, and the attaching surface 8 in this state is a smooth arc surface inclined forward and downward, so that the thigh of the user can rest on the back support body 3, and the comfort of the user riding on the sitting-standing chair in the standing state is improved.

As shown in fig. 6, since the back support 3 is lifted as the seat support 2 is turned over when switching to the standing position, the user is naturally made to change from the sitting position to the standing position; in the sitting posture state, the user sits flat on the seat support body 2, the crotch point of the user is positioned above the seat support body 2, and in the standing posture state, the user rides on the back support body 3, the crotch point is positioned above the back support body 3, so that the user can feel comfortable in both the sitting posture and standing posture states, and after a great deal of design and research, the effect can be realized when the crotch point in the standing posture state is 220mm-320mm higher than the crotch point in the sitting posture state; therefore, after the back support body 3 is lifted, the seat surface formed by the back support surface 5 is 220mm-320mm higher than the seat surface formed by the seat support body 2, and the characteristic is that the horizontal distance between the rotation points of the main support body 1 and the seat support body 2 and the rear end of the seat support body 2 in a sitting posture state is about 220mm-320mm; the crotch point is a common reference point in the design of car seats and refers to the point of attachment of the torso to the thighs in a two-dimensional or three-dimensional mannequin template.

The specific implementation method of the rotation between the seat support body 2 and the main support body 1 is as follows:

as shown in fig. 7 and 8, a rotation locking mechanism is arranged between the base support body 2 and the main support body 1, and comprises a bottom shell 9 fixed relative to the main support body 1 and a bracket 10 fixed relative to the base support body 2, specifically, a lifting air rod 7 in the main support body 1 is inserted into the bottom shell 9 and acts on the bottom shell 9, so that the bottom shell 9 is driven to lift by the lifting air rod 7; the bracket 10 comprises four fixing lugs 11 symmetrically extending from the left side and the right side, and the fixing lugs 11 are connected with the bottom of the seat support body 2 through bolts; the bracket 10 is selectively rotatably arranged on the bottom shell 9, and the rotation locking mechanism further comprises a locking component which can prevent the bracket 10 and the bottom shell 9 from rotating mutually in a sitting state or a standing state; the locking component comprises a locking piece and at least two locking positions, wherein the locking piece is a locking handle 12 arranged on the bottom shell 9 and the bracket 10, the locking position is a locking hole 13 formed on the bottom shell 9 or the bracket 10, and a user can pull the locking handle 12 along the left-right direction of the sitting and standing chair, so that the locking handle 12 can selectively enter the locking hole 13; the locking handle 12 and the locking hole 13 are configured such that the locking handle 12 is inserted into the locking hole 13, and the mutual rotation of the bottom chassis 9 and the bracket 10 is locked.

Further, as shown in fig. 8 to 14, the bracket 10 includes a rotation connection plate 14 vertically disposed at both left and right sides, the bottom case 9 is disposed between the two rotation connection plates 14 and is rotatably connected with the rotation connection plate 14 through a rotation shaft 15 disposed in the left and right direction, the rotation shaft 15 is disposed at the side of the locking handle 12; the bottom shell 9 comprises two vertically arranged mounting plates 16 on the left side and the right side, handle mounting holes 17 are formed in the two mounting plates 16, and the locking handles 12 are arranged in the handle mounting holes 17 in a sliding manner along the left-right direction; the locking handle 12 is provided with an air bar lifting pressing piece 18, the air bar lifting pressing piece 18 is L-shaped and is positioned in the bottom shell 9, the air bar lifting pressing piece 18 comprises a vertical plate 18a and a transverse plate 18b, one end of the vertical plate 18a is fixedly connected with the locking handle 12, the other end of the vertical plate 18a is connected with the rear end of the transverse plate 18b, and the air bar lifting pressing piece 18 rotates along with the rotation of the locking handle 12; an air rod mounting hole 19 for inserting the lifting air rod 7 is formed in the bottom shell 9 below the transverse plate 18b, the head end of the lifting air rod 7 is exposed out of the air rod mounting hole 19, and the air rod lifting pressing piece 18 is configured to rotate along with the locking handle 12 and enable the front end of the transverse plate 18b to be pressed down so as to control the lifting air rod 7; the locking handle 12 comprises a control part 12a and a locking end 12b, wherein the control part 12a is positioned at the left side of the air bar lifting press piece 18, and most of the control part 12a exceeds the bottom shell 9 and the supporting plate; the locking end 12b is positioned at the other side of the air bar lifting pressing piece 18 and slightly protrudes out of the rotating connecting plate 14, and the locking end 12b is configured to be inserted into one end of the locking hole 13; the lifting cylinder is also configured to limit the moving distance of the locking handle 12 in the left-right direction; the left rotary connecting plate 14 is provided with a waist hole 20 avoiding the control part 12a of the locking handle 12, the other rotary connecting plate 14 is provided with two locking holes 13, namely a sitting posture locking hole 13a and a standing posture locking hole 13b, and the sitting posture locking hole 13a is positioned above the standing posture locking hole 13b; when the bracket 10 and the bottom shell 9 rotate around the rotation shaft 15, the control part 12a of the locking handle 12 moves in the waist hole 20; when the locking end 12b of the locking handle 12 enters the sitting posture locking hole 13a, the bracket 10 and the bottom shell 9 are locked, and the back support 3 and the seat support 2 are positioned in a sitting posture state; when the locking end 12b of the locking handle 12 enters the standing posture locking hole 13b, the tray 10 and the bottom case 9 are locked, and the back support 3 and the seat support 2 are positioned in the standing posture state.

As shown in fig. 7, finally, a cover 21 for surrounding the bottom shell 9 and the bracket 10 is arranged below the seat support body 2 so as to improve the overall aesthetic property and safety of the seat; the outer cover 21 rotates synchronously with the seat support body 2 and is in smooth connection with the lower surface of the seat support body 2, and a square groove 22 for avoiding the lifting air rod 7 is formed in the outer cover 21 so that the seat support body 2 and the main support body 1 can smoothly rotate.

The sitting posture switching method of the sitting posture chair is specifically as follows (in a sitting posture state at first):

first, unlocking: when the chair is in a sitting posture state, the locking end 12b of the locking handle 12 is inserted into the sitting posture locking hole 13a, a user pulls the locking handle 12 to enable the locking end 12b to leave the sitting posture locking hole 13a to finish unlocking, and at the moment, the seat support body 2 can rotate relative to the main support body 1;

second, turning: pushing the back support 3 forward or pushing down the front end of the seat support 2, so that the seat support 2 rotates relative to the main support 1, that is, the bracket 10 rotates with the bottom shell 9, and the bracket 10 avoids the locking handle 12 by using the waist hole 20 until the standing locking hole 13b is aligned with the locking handle 12;

thirdly, locking: the user pushes the locking handle 12 to lock the locking end 12b into the standing posture locking hole 13b, and the standing chair is switched from the sitting posture state to the standing posture state.

Similarly, when the sitting posture is switched from the standing posture state to the sitting posture state, the front end of the seat support body 2 only needs to be rotated upwards when the seat support body 2 and the back support body 3 are turned over.

Claims (6)

1. A sitting and standing chair, comprising:

a main support configured as a main support of the seating chair;

the seat support body is rotationally connected with the main support body;

the back support body is fixedly connected with the seat support body relatively, and the seat support body and the back support body are configured to be positioned in at least one sitting posture state and at least one standing posture state; the back support body is provided with a front support surface for being attached to the waist and the back of a human body in a sitting posture state and a rear support surface for being ridden by the human body in a standing posture state;

in a sitting posture state, the seat support body is in a horizontal state and is used for bearing a human body to sit, and the front support surface of the back support body faces forwards and is used for supporting the waist and back of the human body; in the standing state, the back support body turns around the main support body along with the seat support body and enables the rear support surface to face upwards to form a seat surface for a user to ride, and at the moment, the seat support body is in a vertical or inclined downward state;

a rotary locking mechanism is arranged between the seat support body and the main support body and comprises a bottom shell which is fixed relative to the main support body and a bracket which is fixed relative to the seat support body; the bracket is selectively rotatably arranged on the bottom shell, and the rotation locking mechanism further comprises a locking component which is configured to prevent the bracket and the bottom shell from rotating relative to each other in a sitting posture state or a standing posture state;

the locking assembly comprises a locking piece and at least two locking positions, the locking piece is a locking handle arranged on the bottom shell and the bracket, the locking positions are locking holes formed in the bottom shell or the bracket, and the locking handle can selectively enter the locking holes; the locking handle and the locking hole are configured such that the locking handle is inserted into the locking hole, and the mutual rotation of the bottom shell and the bracket is locked;

the bracket comprises rotating connecting plates at the left side and the right side, and the bottom shell is arranged between the two rotating connecting plates and is rotationally connected with the rotating connecting plates through a rotating shaft; one rotating connecting plate is provided with a waist hole for avoiding a locking handle, and the other rotating connecting plate is provided with two locking holes, namely a sitting posture locking hole and a standing posture locking hole; when the rotary seat support body is turned over to enable the bracket to rotate relative to the bottom shell, the locking handle moves in the waist hole; the locking handle enters the sitting posture locking hole and prevents the bracket from rotating relative to the bottom shell, and the back support body and the seat support body are positioned in a sitting posture state; the locking handle enters the standing position locking hole and prevents the bracket from rotating relative to the bottom shell, and the back support body and the seat support body are positioned in a standing position;

the main support comprises supporting legs and supporting columns, the upper ends of the supporting columns are inserted into the bottom shell, and the lower ends of the supporting columns are connected with the supporting legs; an outer cover for surrounding the bottom shell and the bracket is arranged below the seat support body, and the outer cover is synchronously and rotatably connected with the seat support body; the middle part of the outer cover is provided with a long groove for avoiding the support column, and when the seat support body and the main support body rotate relatively, the seat support body avoids the support column by using the long groove.

2. The seat as claimed in claim 1, wherein: in the standing state, the back support body is saddle-shaped with a lower middle and a higher front and back.

3. The seat as claimed in claim 1, wherein: the back support body is characterized in that the back support body is provided with a joint surface for joint with the inner side of thighs, and the joint surface is a smooth cambered surface which inclines forwards and downwards in a standing state.

4. The seat as claimed in claim 1, wherein: the back support body is fixedly connected to the rear end of the seat support body, and when the sitting posture state is switched to the standing posture state, the rear end of the seat support body is turned over forwards and upwards, and the rear support surface of the back support body is lifted and turned over to enable the rear support surface to meet the riding sitting of a human body compared with the seat support body; in the sitting position, the crotch point is above the seat support, in the standing position, the crotch point is above the back support, and the crotch point in the standing position is 220mm-320mm higher than the crotch point in the sitting position.

5. The seat as claimed in claim 1, wherein: the bottom shell comprises two vertically arranged mounting plates at the left side and the right side, handle mounting holes are formed in the two mounting plates, and the locking handles are arranged in the handle mounting holes in a sliding mode along the left-right direction.

6. A sitting posture switching method based on the sitting posture chair of claim 1, characterized in that: the method comprises three steps of unlocking, overturning and locking:

first, unlocking: when the sitting and standing chair is in a sitting or standing state, the locking handle is inserted into one of the two locking holes; the locking handle is pulled out of the locking hole to unlock, and the seat support body can rotate relative to the main support body;

second, turning: applying a force to the seat support or back support to rotate the seat support relative to the main support and to rotate the locking handle into alignment with the other locking aperture;

thirdly, locking: the locking handle is inserted into the currently aligned locking holes to complete locking, and the sitting position and standing position of the sitting position chair are switched.