CN112369855A

CN112369855A - Chair for sitting and standing and sitting and standing posture switching method

Info

Publication number: CN112369855A
Application number: CN202011215083.8A
Authority: CN
Inventors: 何基; 商科伟
Original assignee: Hangzhou Qixiong Technology Co ltd
Current assignee: Hangzhou Qixiong Technology Co ltd
Priority date: 2020-11-04
Filing date: 2020-11-04
Publication date: 2021-02-19
Anticipated expiration: 2040-11-04
Also published as: CN112369855B

Abstract

The invention 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 relatively and 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 which is used for fitting the waist of the human body in a sitting posture state and a rear support surface which is used for the human body to ride 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 a locking hole through a locking handle; compared with the prior art, the chair can realize the switching of the sitting and standing postures, the supporting body of the reversible seat is switched to the standing posture state, and a user rides on the chair in the standing posture to relieve the discomfort caused by long-time sitting; the chair for sitting and standing is convenient to operate when the sitting and standing positions are switched; the chair directly achieves a proper and comfortable sitting height after completing the switching of the sitting and standing postures, and time is wasted without excessive adjustment.

Description

Chair for sitting and standing and sitting and standing posture switching method

Technical Field

The invention 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 the study and work of modern people, and only has the function of sitting for most office chairs or study chairs; physiologically, a person standing for a long time is easy to feel tired due to heavy leg load; people who sit for a long time also feel uncomfortable or tired, and various diseases such as hypomnesis, headache and dizziness, lumbar vertebra and 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. Sedentariness physical disadvantages have been studied and reported in many ways, where a person standing for a long time wants to sit and stand.

Among sedentary people, it seems that office white-collar workers and students who study in schools sit for the longest time, and they sit for work or study almost all the day, and are difficult to adjust their postures, and not only people are easily fatigued, but also their bodies are easily affected. The solution to this problem is preferably to allow the "sitting" and "standing" of the person to be alternated.

Therefore, a sitting and standing chair is urgently needed in the market, and a user can work in a sitting posture and also can ride on the chair to work so as to relieve the pressure caused by long-time sitting.

Chinese utility model patent of cn201420232000.x discloses a sit and stand and combine chair, including the seat, be used for supporting the supporting part of seat, the supporting part has the bracing piece, the bracing piece with the seat activity links to each other, still including swing, with the telescopic machanism that the supporting part links to each other, swing one end links to each other with the seat activity, the other end of swing with telescopic machanism links to each other. The sitting and standing combined chair can really realize the switching between the sitting posture and the standing posture, but in consideration of comfort, the sitting and standing combined chair has no chair back in the sitting posture state, so that the waist and the back of a user cannot be supported, and the comfort is low; the sitting and standing combined chair has no seat surface in a standing state, a user only can lean on the chair, the comfort is poor, and the chair is not suitable for heavy people because the user can topple over when leaning on the chair.

Disclosure of Invention

In order to solve the above technical problems, the present invention provides a chair for sitting and standing, which has a sitting posture state in which a user can sit on a seat support and a standing posture state in which the user can ride on a back support, through the rotational connection of a seat support and a main support.

Further, a method for switching sitting and standing postures based on the sitting and standing chair is provided, wherein the relative rotation between the seat support body and the main support body is locked or unlocked by locking the handle to enter or leave the locking hole, and when the locking handle leaves the locking hole, the seat support body and the back support body can be switched to another state from the current state (sitting posture state or standing posture state) through the relative rotation with the main support body; when the locking handle enters the locking hole, the seat support body and the main support body are prevented from rotating relatively, so that the seat support body and the back support body stay in the current state.

The technical scheme of the invention is realized as follows:

a chair for sitting and standing comprising:

a main support configured as a main body support of a chair for sitting and standing;

a seat support rotatably connected to the main support;

a back support fixedly connected with the seat support, the seat support and the back support configured to be positioned in at least one sitting position state and at least one standing position state; the back support body is provided with a front support surface for fitting the waist and the back of a human body in a sitting posture state and a rear support surface for the human body to ride in a standing posture state;

in a sitting posture state, the seat supporting body is in a horizontal state and is used for supporting the sitting of a human body, and the front supporting surface of the back supporting body faces forwards and is used for supporting the waist and the back of the human body; in the standing position, the back support body is turned around the main support body along with the seat support body and the back support surface is upward to form a seat surface for a user to ride on, and at the moment, the seat support body is in a vertical or oblique downward state.

The switching of the sitting and standing postures of the sitting and standing chair can be completed only by turning over the seat supporting 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 supporting the human body in a standing posture state, the front support surface and the rear support surface of the back support body accord with the functions of the back support body in design, and the whole structure is ingenious in design.

Preferably, the rear support surface of the back support body is in a saddle shape with a low middle and a high front and back in a standing state. Reach through the curved surface design to back holding surface, the saddle form can the time user can comfortably ride and sit on back of the body supporter, can prevent again that the user from riding forward or backward landing back of the body supporter when sitting, compromise travelling comfort and security.

Preferably, the back support surface of the back support has a contact surface for contacting the inner side of the thigh, and the contact surface has a smooth curved surface inclined forward and downward in the standing state. The binding face accords with the design of ergonomic, has further promoted the travelling comfort that the user rides on back support body.

Preferably, the back support body is fixedly connected to the rear end of the seat support body, when the sitting posture state is switched to the standing posture state, the rear end of the seat support body is turned over towards the front upper part, and the rear support surface of the back support body is lifted up compared with the seat support body and turned over to enable the rear support surface to be ridden by the human body; in the sitting state, the crotch point is above the seat support, in the standing state, the crotch point is above the back support, and the crotch point in the standing state is 220mm-320mm higher than the crotch point in the sitting state. The crotch point is a common reference point in the design of the automobile seat and refers to a connection point of a human trunk and a thigh in a two-dimensional or three-dimensional human model template; the design of the corresponding height of the lifting seat surface when the sitting and standing postures are switched enables the sitting and standing chair to directly reach a proper and comfortable sitting height after the switching is completed, the operation is simple and convenient, the chair is more suitable for young people who are busy to learn on duty at present, time waste due to excessive adjustment is not needed, the chair can be switched between the sitting posture and the standing posture, and the negative influence of long-time sitting on the body is reduced.

Preferably, a rotation locking mechanism is arranged between the seat support and the main support, and the rotation locking mechanism comprises a bottom shell fixed relative to the main support and a bracket fixed relative to the seat support; the bracket is selectively and rotatably arranged on the bottom shell, and the rotation locking mechanism further comprises a locking assembly which is configured to prevent the bracket and the bottom shell from rotating mutually in a sitting posture state or a standing posture state. The switch for switching the sitting posture is integrated into the chassis, the structure is ingenious, unnecessary external components are reduced, the appearance of the chair for sitting 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 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 case and the bracket is locked. The matching operation of the locking handle and the locking hole is simple and convenient, and simultaneously, the cost is low.

Preferably, 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 rotatably connected with the rotating connecting plates through a rotating shaft; one rotating connecting plate is provided with a waist hole avoiding the locking handle, and the other rotating connecting plate is provided with two locking holes which are a sitting posture locking hole and a standing posture locking hole respectively; when the support body of the overturning seat enables 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 and the bottom shell from rotating relatively, 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 and the bottom shell from rotating relatively, and the back support body and the seat support body are positioned in a standing position state.

Preferably, the drain pan includes the mounting panel of two vertical settings of the left and right sides, has all seted up the handle mounting hole on two mounting panels, the locking handle slide the setting in the handle mounting hole along left and right directions.

Preferably, the main support body comprises support legs and a support column, the upper end of the support column is inserted into the bottom shell, and the lower end of the support column is connected with the support legs; an outer cover used for surrounding the bottom shell and the bracket is arranged below the seat supporting body, and the outer cover is synchronously and rotatably connected with the seat supporting 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 supporting body, so that the integrity, the attractiveness and the safety of the chair are improved.

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

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

step two, turning: applying force to the seat support or the back support to rotate the seat support relative to the main support and rotate the locking handle to align with the other locking hole;

step three, locking: the locking handle is inserted into the currently aligned locking hole to complete locking, and the chair completes the switching of the sitting and standing postures.

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

the invention has the beneficial effects that:

1. the chair for sitting and standing can realize the switching of sitting and standing postures, when a user feels discomfort caused by long-time sitting, the seat supporting body and the back supporting body which can be overturned are switched to a standing posture state, and the user rides and sits on the chair for sitting and standing in the standing posture, so that the discomfort caused by long-time sitting is relieved, and the body health of the person who sits for a long time is protected.

2. The chair for sitting and standing has simple structure, the whole appearance is the same as that of the common chair, and is even simpler, and meanwhile, the production cost is also reduced; the simple structure of the chair for sitting and standing makes the operation of switching sitting and standing postures more convenient.

3. The design of the corresponding height of the lifting seat surface when the sitting and standing postures are switched enables the sitting and standing chair to directly reach a proper and comfortable sitting height after the switching is completed, the operation is simple and convenient, the chair is more suitable for young people who are busy to learn on duty at present, time waste due to excessive adjustment is not needed, the chair can be switched between the sitting posture and the standing posture, 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 switching to standing posture state, the user can ride on the back support body of this chair, and the design of back holding surface saddle shape makes the user can not follow the landing from front and back simultaneously, has promoted travelling comfort, stability and security, and applicable more crowds, weight no longer are the restriction.

Drawings

FIG. 1 is a side view of a seated position and a standing position transition of an embodiment of the present invention;

FIG. 2 is a schematic perspective view of the chair for sitting and standing in a sitting position according to the embodiment of the present invention;

FIG. 3 is a schematic perspective view of the chair for sitting and standing in the process of switching sitting and standing positions according to the embodiment of the present invention;

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

FIG. 5 is a perspective view of the chair for sitting and standing in the standing position according to the embodiment of the present invention;

FIG. 6 is a comparison of crotch point height between a sitting position and a standing position according to an embodiment of the present invention;

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

FIG. 8 is an exploded view of a rotation lock mechanism in an embodiment of the present invention;

FIG. 9 is a side view of the bottom housing and the bracket in a sitting position according to the embodiment of the present invention;

FIG. 10 is a cross-sectional view of the bottom housing and the bracket in a sitting position according to an embodiment of the present invention;

FIG. 11 is a schematic perspective view of the bottom case and the bracket in a standing position according to the embodiment of the present invention;

FIG. 12 is a cross-sectional view of the bottom case and the bracket in a standing position according to the embodiment of the present invention;

FIG. 13 is a cross-sectional view of the insertion of the locking end into the locking hole in an embodiment of the present invention;

figure 14 is a cross-sectional view of the locking end of the present invention removed from the locking hole in an embodiment of the present invention.

The figures are numbered: a main support 1; a seat support body 2; a back support 3; a front support surface 4; a rear support surface 5; a five-star foot 6; a lifting air rod 7; a bonding surface 8; a bottom case 9; a bracket 10; a fixing lug 11; a lock handle 12; a control unit 12 a; a locking end 12 b; a locking hole 13; a seating position locking hole 13 a; a standing position locking hole 13 b; the connecting plate 14 is rotated; a rotating shaft 15; a mounting plate 16; a handle mounting hole 17; air rod pressure increasing and decreasing sheet 18; a riser 18 a; a transverse plate 18 b; a gas lever mounting hole 19; a waist hole 20; a cover 21; a square groove 22.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. 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 than one 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 embodiment of the invention is as follows:

as shown in fig. 1, the present invention provides a sitting and standing chair, comprising a main support 1, a seat support 2 and a back support 3, wherein the main support 1 is configured as a main body support of the sitting and standing chair, and the seat support 2 is rotatably connected with the main support 1; the back support body 3 is relatively fixedly connected with the seat support body 2, 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 position and a rear support surface 5 on which the human body rides.

In this embodiment, the main support 1 includes a supporting foot and a supporting column, the supporting foot and the supporting column generally refer to a five-star foot 6 and a lifting air rod 7 of a sitting and 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 that when the seat supporting body 2 and the back supporting body 3 are positioned in the sitting posture state, the seat supporting body 2 is in a horizontal state, and a user can sit on the sitting-standing chair flatly; when the seat supporting body 2 and the back supporting body 3 are positioned in a standing state, the seat supporting body 2 is in a vertical or oblique downward state, the back supporting body 3 is in a horizontal state as a whole, and a user can ride or straddle on the seat chair; the sitting posture is that the back support body 3 is turned forwards along with the seat support body 2 relative to the main support body 1 to be in an upright posture, the seat support body 2 supports the human body, the front support surface 4 faces forwards, and the back support body 3 supports the waist and the back of the human body; the standing position is configured such that the back support body 3 is turned over to be laid flat with the seat support body 2, the rear support surface 5 faces upward and forms a seat surface for a user to ride on, and at this time, the back support body 3 supports the human body.

As shown in fig. 1-5, specifically, the seat support 2 and the back support 3 are integrally formed, so that when the seat support 2 and the main support 1 are turned over, the seat support 2 and the back support 3 can be kept relatively fixed, i.e. the back support 3 rotates along with the turning over of the seat support 2; when the standing posture state is switched, the seat support body 2 is turned forwards, the front end of the seat support body 2 rotates downwards, the rear end of the seat support body 2 tilts upwards, the back support body 3 is connected with the rear end of the seat support body 2 and rises along with the upward tilting of the rear end of the seat support body 2 until the back support surface 5 of the back support body 3 is in a saddle shape with a low middle and a high front and back; the back support body 3 in this state has the back support face 5 facing upwards, the back support face 5 has a binding face 8 for binding the inner side of the thigh, and the binding face 8 in this state is a smooth cambered surface which inclines forwards and downwards so that the thigh of the user can be placed on the back support body 3, and the comfort of the user riding on the chair for sitting and standing in the standing state is improved.

As shown in fig. 6, since the back support 3 is lifted up as the seat support 2 is turned over when switching to the standing posture, the user is naturally made to change from the sitting posture to the standing posture; in the sitting position, the user sits on the seat support body 2 flatly, the crotch point of the user is positioned above the seat support body 2, in the standing position, the user rides on the back support body 3, the crotch point is positioned above the back support body 3, and in order to enable the user to feel comfortable in both the sitting position and the standing position, after a great deal of design and research, the effect can be realized when the crotch point in the standing position is higher than the crotch point in the sitting position by 220mm-320 mm; therefore, after the back support body 3 is lifted, the seat surface formed by the back support surface 5 is higher than the seat surface formed by the seat support body 2 by 220mm-320mm, which is characterized in that the structure is that the horizontal distance between the rotation point 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 is about 220mm-320 mm; the crotch point is a common reference point in the design of the automobile seat, and refers to a connection point of the trunk and the thighs of a human body in a two-dimensional or three-dimensional human body model template.

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

as shown in fig. 7 and 8, a rotation locking mechanism is provided between the seat support 2 and the main support 1, and includes a bottom case 9 fixed relative to the main support 1 and a bracket 10 fixed relative to the seat support 2, specifically, the lifting air rod 7 in the main support 1 is inserted into the bottom case 9 and acts on the bottom case 9, so that the bottom case 9 is driven to lift by the lifting air rod 7; the bracket 10 comprises four fixing lugs 11 symmetrically extending towards 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 and rotatably arranged on the bottom shell 9, and the rotation locking mechanism further comprises a locking component which is configured to prevent the bracket 10 and the bottom shell 9 from rotating mutually 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 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 in the left-right direction of the chair to enable the locking handle 12 to 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 case 9 and the bracket 10 is locked.

Further, as shown in fig. 8-14, the bracket 10 includes rotation connecting plates 14 vertically disposed at left and right sides, the bottom shell 9 is disposed between the two rotation connecting plates 14 and rotatably connected to the rotation connecting plates 14 through a rotation shaft 15 disposed along left and right directions, the rotation shaft 15 is disposed beside the locking handle 12; the bottom shell 9 comprises two vertically arranged mounting plates 16 at the left side and the right side, the two mounting plates 16 are respectively provided with a handle mounting hole 17, and the locking handle 12 is 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 rod pressure and rise piece 18, the air rod pressure and rise piece 18 is L-shaped and is positioned in the bottom shell 9, the air rod pressure and rise 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 rod pressure and rise 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 and lowering sheet 18 is configured in such a way that the air rod lifting and lowering sheet 18 rotates along with the locking handle 12 and the front end of the transverse plate 18b is pressed down to control the lifting air rod 7; the locking handle 12 comprises a control part 12a and a locking end 12b, the control part 12a is positioned at the left side of the air rod pressure rising and reducing sheet 18, and most of the control part 12a exceeds the bottom shell 9 and the supporting plate; a locking end 12b is positioned at the other side of the air lever pressure-rising and-dropping piece 18 and slightly protrudes from the rotation connecting plate 14, the locking end 12b being configured to be inserted into one end of the locking hole 13; the lift cylinder is also configured to limit the moving distance of the lock handle 12 in the left-right direction; a waist hole 20 avoiding the control part 12a of the locking handle 12 is formed in the rotating connecting plate 14 on the left side, two locking holes 13, namely a sitting posture locking hole 13a and a standing posture locking hole 13b, are formed in the other rotating connecting plate 14, and the sitting posture locking hole 13a is positioned above the standing posture locking hole 13 b; when the bracket 10 and the bottom case 9 rotate relative to each other about the rotation shaft 15, the control portion 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 body 3 and the seat support body 2 are positioned in a sitting posture state; when the locking end 12b of the locking handle 12 enters the standing position locking hole 13b, the bracket 10 and the bottom case 9 are locked, and the back support 3 and the seat support 2 are positioned in the standing position.

As shown in fig. 7, a cover 21 is finally provided under the seat support 2 to surround the bottom shell 9 and the bracket 10, so as to improve the aesthetic appearance and safety of the whole seat; the outer cover 21 and the seat support body 2 rotate synchronously and are smoothly connected 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 rotate smoothly.

The method for switching the sitting and standing positions of the sitting and standing chair is specifically as follows (in the sitting position state at first):

step one, 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 complete unlocking, and at the moment, the seat support body 2 can rotate relative to the main support body 1;

step two, turning: pushing the back support 3 forward or pressing the front end of the seat support 2 downward causes the seat support 2 to rotate relative to the main support 1, i.e. the bracket 10 and the bottom case 9 rotate, the bracket 10 uses the waist hole 20 to avoid the locking handle 12 until the standing locking hole 13b is aligned with the locking handle 12;

step three, locking: the user pushes the locking handle 12 to make the locking end 12b enter the standing position locking hole 13b to complete the locking, and at the moment, the sitting position chair completes the switching from the sitting position state to the standing position state.

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

Claims

1. A chair for sitting and standing, comprising:

a seat support rotatably connected to the main support;

2. A chair as claimed in claim 1, wherein: in a standing state, the rear supporting surface of the back supporting body is in a saddle shape with a low middle and a high front and a high back.

3. A chair as claimed in claim 1, wherein: the back supporting surface of the back supporting body is provided with a binding surface used for binding the inner side of the thigh, and the binding surface is a smooth cambered surface which inclines forwards and downwards in a standing state.

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

5. A chair as claimed in claim 1, wherein: a rotation locking mechanism is arranged between the seat support body and the main support body, and comprises a bottom shell fixed relative to the main support body and a bracket fixed relative to the seat support body; the bracket is selectively and rotatably arranged on the bottom shell, and the rotation locking mechanism further comprises a locking assembly which is configured to prevent the bracket and the bottom shell from rotating mutually in a sitting posture state or a standing posture state.

6. A chair as claimed in claim 5, wherein: 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 case and the bracket is locked.

7. A chair as claimed in claim 6, wherein: 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 in rotating connection with the rotating connecting plates through a rotating shaft; one rotating connecting plate is provided with a waist hole avoiding the locking handle, and the other rotating connecting plate is provided with two locking holes which are a sitting posture locking hole and a standing posture locking hole respectively; when the support body of the overturning seat enables 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 and the bottom shell from rotating relatively, 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 and the bottom shell from rotating relatively, and the back support body and the seat support body are positioned in a standing position state.

8. A chair as claimed in claim 7, wherein: the drain pan includes the mounting panel of two vertical settings of the left and right sides, has all seted up the handle mounting hole on two mounting panels, the locking handle slide the setting in the handle mounting hole along left and right directions.

9. A chair as claimed in claim 5, wherein: the main support body comprises support legs and support columns, the upper ends of the support columns are inserted into the bottom shell, and the lower ends of the support columns are connected with the support legs; an outer cover used for surrounding the bottom shell and the bracket is arranged below the seat supporting body, and the outer cover is synchronously and rotatably connected with the seat supporting 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.

10. A sitting and standing posture switching method of a sitting and standing chair according to claim 6, characterized in that: the method comprises three steps of unlocking, overturning and locking: