CN212995469U

CN212995469U - Main body structure of sitting and lying dual-purpose student chair and sitting and lying dual-purpose office chair

Info

Publication number: CN212995469U
Application number: CN202020169118.8U
Authority: CN
Inventors: 韩宝兴; 韩康
Original assignee: Jiangshan Qiqizheng Electromechanical Technology Co ltd
Current assignee: Jiangshan Qiqizheng Electromechanical Technology Co ltd
Priority date: 2020-01-18
Filing date: 2020-01-18
Publication date: 2021-04-20
Anticipated expiration: 2030-01-18

Abstract

The main structure of the dual-purpose student chair for sitting and lying and the dual-purpose office chair for sitting and lying of the utility model mainly comprises a sitting and lying switching frame component and a chair back component. The cross frame component consists of a diagonal member component I, a diagonal member component II and a side member of the seat and lying switching frame component. The controllable gas spring is arranged on the cross frame component, and the chair back component is connected to the cross frame component through the tightening component. The controllable gas spring and the fixed fastening assembly are operated to realize the mutual cutting of the sitting and lying of the chair and the height adjustment of the seat piece. The structure characteristic of the controllable gas spring ensures that the height of the seat piece is adjusted greatly when the stroke of the controllable gas spring is small, the chair contracts when sitting and extends when lying, and feet are all placed on the ground when sitting and lying. The utility model discloses a crossing main part mechanism for still being in development virgin place of classroom sits the student chair of lying and on popular sit the office chair of lying, for the appropriate and good afternoon nap mode creation condition such as middle and primary school student and teacher, serve middle and primary school student's development, physical and mental health and study.

Description

Main body structure of sitting and lying dual-purpose student chair and sitting and lying dual-purpose office chair

Technical Field

The utility model belongs to the technical field of education equipment and furniture class technique and specifically relates to a sit main part structure of dual-purpose student chair of lying and sit dual-purpose office chair of lying.

Background

The proper and good afternoon nap mode is beneficial to development, physical and mental health and learning of primary and secondary school students, and physical and mental health and work of office workers such as teachers and the like. The afternoon nap status of the implemented or promoted middle and primary schools is various: most students in middle and primary schools adopt improper sleeping postures on desks; some students take the sleeping tool to lie on the ground for afternoon nap; some schools are provided with afternoon nap classrooms; … … are provided. The development of the sitting and lying dual-purpose student chair for classrooms creates conditions for the middle and primary school students to have a proper and good afternoon nap mode. For a variety of reasons, a suitable and good chair for students in classrooms has been a virgin area to be developed. The development of a sitting and lying dual-purpose office chair suitable for popularization provides a proper and good afternoon nap mode for office staff such as teachers and the like, and provides conditions for improving the utilization rate of office places.

The technical schemes of ' telescopic office and study chair for sitting and lying ' with the patent number ZL201721517914.0, ' telescopic chair for sitting and lying ' with the patent number ZL201820336205.0 and ' sitting and lying switching mechanism for sitting and lying ' with the application number 201910637925.X ' are implemented, and the technical schemes are used for trying to create conditions for proper and good afternoon nap modes of office staff such as primary and secondary school students and teachers. From the practice of the technical schemes, the characteristics of crowded but neat classrooms, limited used space and area, large height difference between peer students and different classes students, well-moving middle and primary school students and the like of deep understanding and research on school educational appliances and the using environment of the classrooms are determined that the proper and good sitting and lying dual-purpose student chair for the classrooms to be realized can meet the following requirements: the chair comprises a chair back, a chair seat, a chair back and a chair cover, wherein the chair is telescopic, and can be retracted when sitting and extended when lying; secondly, feet are all placed on the ground when the user sits and lies; the adjustable range of the seat height is large; fourthly, no handrail and no soft bag are used; convenient, comfortable, safe and reliable use; sixthly, the environment is protected. The main mechanisms of the three technical schemes are all parallelogram mechanisms, the chair back is linked with the seat frame, the height adjustment range of the seat is small, and the requirements of the sitting and lying dual-purpose student chair can be met only partially, or the three technical schemes are realized by adding mechanisms and complex structures; the adjustment range of the seat height and the backrest angle of the office chair for sitting and lying is also increased.

We try to adopt another main body mechanism technical scheme and use an excellent structure to meet the requirements of the sitting and lying dual-purpose student chair and the office chair.

SUMMERY OF THE UTILITY MODEL

The main purpose of the utility model is to provide a main structure of a dual-purpose student chair for sitting and lying and a dual-purpose office chair for sitting and lying, which tries to adopt a cross type main body mechanism, and the chair back and the seat frame can be separated or linked, so as to meet the requirements that the dual-purpose student chair for sitting and lying suitable for the classroom is telescopic, the feet of the student chair for sitting and lying are all put on the ground, the height of the seat can be adjusted in a large range, the use is convenient, reliable and comfortable, safety measures are provided, and the dual-purpose student chair for sitting and lying is suitable for the characteristics of crowded classroom, tidi; the requirements of large adjustment ranges of the seat height and the chair back angle of the sitting and lying dual-purpose office chair are met. Therefore, conditions are created for popularization and proper and good afternoon nap implementation of schools and offices, and development, physical and mental health and learning of primary and secondary school students are served; the method creates conditions for proper and good afternoon nap modes of office workers such as teachers and the like, serves physical and mental health and work of the office workers such as teachers and the like, and creates conditions for improving the utilization rate of office places.

In order to achieve the main object, the present invention is achieved by the following technical solutions. The main structure of the dual-purpose student chair for sitting and lying and the dual-purpose office chair for sitting and lying mainly comprises a sitting and lying switching frame component and a chair back component, wherein the sitting and lying switching frame component mainly comprises an inclined piece component, a side piece, a seat piece and a locking component, the inclined piece component comprises a transverse piece, a left inclined piece and a right inclined piece, one end of the transverse piece is fixedly connected with the proper position of the left inclined piece, the other end of the transverse piece is fixedly connected with the proper position of the right inclined piece, the inclined piece component comprises an inclined piece component I and an inclined piece component II, the transverse piece comprises a transverse piece I and a transverse piece II, the left inclined piece comprises a left inclined piece I and a left inclined piece II, the right inclined piece comprises a right inclined piece I and a right inclined piece II, one end of the transverse piece I is fixedly connected with the proper position of the left inclined piece I, the other end of the transverse piece I is fixedly connected with the proper position of the right inclined piece I, and thus forming said ramp member assembly I, one end of said cross member II being fixedly connected to a suitable position of said left ramp member II, the other end of said cross member II being fixedly connected to a suitable position of said right ramp member II, and thus forming said ramp member assembly II, said suitable position of said left ramp member I being rotatably connected to a suitable position of said left ramp member II, said suitable position of said right ramp member I being rotatably connected to a suitable position of said right ramp member II, said ramp member assembly I being interdigitated with said ramp member assembly II by said rotatable connection, said side members being left and right side members, said side members being formed of front and rear side members, said front and rear side members forming a moving pair, said left side member being formed of a front left side member and a rear left side member, said front and rear left side members forming a left moving pair, the right side part consists of a front right side part and a rear right side part, the front right side part and the rear right side part form a right moving kinematic pair, one end of the rear left side part is rotatably connected with the upper end of the left inclined part I, one end of the rear right side part is rotatably connected with the upper end of the right inclined part I, one end of the front left side part is rotatably connected with the upper end of the left inclined part II, one end of the front right side part is rotatably connected with the upper end of the right inclined part II, the inclined part assembly and the side parts form a cross frame assembly, the left side of the seat part is connected with the left side part, the right side of the seat part is connected with the right side part, and the locking assembly is arranged at a proper position of the cross frame assembly. The back of the chair part mainly constitute by back of the body frame subassembly and back of the body subassembly, back of the body frame subassembly constitute by back of the body straight piece and back of the body crosspiece, back of the body straight piece for left back straight piece and right back straight piece, the one end of back of the body crosspiece link firmly the right position of left back straight piece on, the other end of back of the body crosspiece link firmly the right back straight piece on the suitable position, back of the body subassembly connect back of the body frame subassembly on, back of the body part connect be in the suitable position of cross frame subassembly on.

The locking assembly is arranged at a proper position of the cross frame assembly and is realized by the following steps: the locking member assembly mainly comprises an upper moving member, a lower moving member and a locking member, one end of the upper moving member is connected to the proper position of the inclined member assembly I, one end of the lower moving member is connected to the proper position of the inclined member assembly II, the upper moving member is movably connected with the lower moving member, and the locking member is connected to the upper moving member and the lower moving member.

The locking assembly is arranged at a proper position of the cross frame assembly and is realized by the following steps: the locking assembly is a controllable gas spring assembly, the controllable gas spring assembly is composed of a small controllable gas spring rod assembly, a connecting piece I, a connecting piece II and a control button, the small controllable gas spring rod assembly is composed of a sleeve piece and a rod piece, the sleeve piece and the rod piece form a moving pair, one end of the small controllable gas spring rod assembly is connected with the connecting piece I, the other end of the small controllable gas spring rod assembly is connected with the connecting piece II, the connecting piece I is connected to the proper position of the inclined piece assembly I, the connecting piece II is connected to the proper position of the inclined piece assembly II, and the control button is arranged at the proper position of the sitting and lying switching frame component.

The locking assembly is arranged at a proper position of the cross frame assembly and is realized by the following steps: the locking component is a limiting piece which is fixedly connected with one side piece of the front side piece and the rear side piece which form the moving kinematic pair, and the limiting piece is movably connected with the other side piece.

The chair back component is connected to the proper position of the cross frame component, and is realized by the following steps: the left back straight piece of the chair back component is fixedly connected with the upper end of the left inclined piece of the cross frame component, and the right back straight piece of the chair back component is fixedly connected with the upper end of the right inclined piece of the cross frame component.

The chair back component is connected to the proper position of the cross frame component and is realized through a fastening component: the left back of the body straight piece of back of the chair part with the left oblique I upper end swing joint of cross frame subassembly, the right back of the body straight piece of back of the chair part with the right oblique I upper end swing joint of cross frame subassembly, decide tight subassembly by decide tight piece, locating pin, setting element and elastic component and constitute, decide tight subassembly for a left side decide tight subassembly and the right side decide tight subassembly, the tight subassembly of deciding be left side decide tight piece and right side tight piece, the locating pin be left locating pin and right locating pin, the setting element be left setting element and right setting element, the elastic component be left elastic component and right elastic component, a left side decide tight subassembly by left side decide tight piece, left locating pin, left setting element and left elastic component and constitute, a left side decide the one end of tight piece pass through left locating pin rotate connect in the right position of the left back of the body straight piece lower extreme of the back of the chair part, the other end of left side tight is provided with the constant head tank, the left side setting element link firmly the suitable position of the back left side piece of cross frame subassembly on, the one end of left side elastic component connect the suitable position of left side retaining member on, the other end of left side elastic component connect left side setting element on, the right side decide tight subassembly by right side retaining member, right locating pin, right side setting element and right elastic component and constitute, the one end of right side retaining member rotate through right locating pin and connect the right back of the body right side of back of the body part suitable position of lower extreme on, the other end of right side retaining member be provided with the constant head tank, right side setting element set up the suitable position of the back right side piece of cross frame subassembly on, the one end of right side elastic component connect the right side suitable position of retaining member on, the other end of right side elastic component connect the right side setting element on.

The left inclined piece and the right inclined piece are suitably nonlinear.

The proper position of the sitting and lying switching component is provided with a buffer piece.

And a limiting part and a plurality of limiting holes are arranged at the proper position of the cross frame component.

And a pulley is arranged at a proper position of the lower part of the inclined component.

Through the structure, the main body structures of the sitting and lying dual-purpose student chair and the sitting and lying dual-purpose office chair have two types of operations and actions of sitting and lying mutual cutting and seat part height adjustment.

I) Typical seating and reclining undercutting operations and actions can be divided into two categories with different locking assemblies: firstly, the locking assembly is a controllable gas spring assembly; the locking component is a limiting piece; the mutual switching operation and action of sitting and lying can be divided into the following steps by different connection modes of the chair back component and the sitting and lying switching component: firstly, the chair back component is connected with the cross frame component through the fastening component, and the chair back component and the sitting and lying switching component are separated, namely the sitting and lying switching component and the chair back component are respectively operated; and secondly, a left back straight piece and a right back straight piece of the chair back component are fixedly connected with the upper end of the left inclined piece and the upper end of the right inclined piece of the cross frame component respectively, and the chair back component is linked with the sitting and lying switching component. The following describes the operation and action of the seat-lying switching member and the locking assembly, which are a controllable gas spring assembly and a limiting member, respectively, in the case of the independent transfer of the seat back member and the seat-lying switching member.

First, the operation and action of the locking assembly for the controllable gas spring assembly for seating and lying are switched as follows.

When sitting, the sitting and lying switching part is positioned and locked by the controllable gas spring assembly; the chair back component is positioned and locked by the locking component, the lower ends of the left straight back component and the right straight back component are respectively connected with the left fixing component and the right fixing component in a rotating way through the left positioning pin and the right positioning pin, and the positioning grooves at one ends of the left fixing component and the right fixing component respectively clamp the left positioning component and the right positioning component under the respective actions of the elasticity of the left elastic component and the right elastic component, so that the chair back component is fixed in a sitting state. The seat and lying switching component is provided with a buffer piece. When the back rest component group is a movable back rest component and a fixed back rest component, the movable back rest component is positioned at the lower position.

There are two methods of operation to switch from a sitting position to a lying position.

The first method of operation: when a person sits on the chair and operates the control button of the controllable gas spring assembly, the controllable gas spring assembly still has a constant force after losing the locking force. The human body gravity overcomes the constant force of the controllable gas spring assembly and the gradually increased force of the buffer piece, the seat piece is horizontally moved and extended downwards and forwards along with the moving kinematic pair and the inclined piece assembly, the gravity center of the human body moves forwards along with the seat piece, and the supporting points of the inclined piece assembly I and the inclined piece assembly II respectively move forwards and backwards. In the proper position, the control button of the controllable gas spring assembly is released and the seat member is locked in the reclined position by the controllable gas spring assembly. The left fixing piece and the right fixing piece are operated to overcome the elasticity of the left elastic piece and the right elastic piece, the positioning grooves of the left fixing piece and the right fixing piece are separated from the left positioning piece and the right positioning piece respectively, the chair back component is rotated backwards, the left positioning pin and the right positioning pin respectively lean against the lower surfaces of the rear left side piece and the rear right side piece, the chair back component is positioned at the lying position, and the movable backrest piece is pulled upwards to a proper position.

The second operation method comprises the following steps: when a person sits on or leaves the chair, the left fixing piece and the right fixing piece are operated to overcome the elasticity of the left elastic piece and the right elastic piece, the positioning grooves of the left fixing piece and the right fixing piece are respectively separated from the left positioning piece and the right positioning piece to realize the backward rotation of the chair back component, the left positioning pin and the right positioning pin respectively lean against the lower surfaces of the rear left side piece and the rear right side piece to be positioned at the lying position, and the movable backrest piece is pulled upwards to a proper position; when a person sits on the chair, the control button of the controllable gas spring assembly is operated, the controllable gas spring assembly still has a constant force after the locking force is lost, the gravity of the human body overcomes the constant force of the controllable gas spring assembly and the gradually increased force of the buffer piece, the seat piece is enabled to horizontally move downwards and forwards along with the sliding pair and the oblique piece assembly, and the gravity center of the human body moves forwards along with the seat piece. Meanwhile, the supporting points of the inclined component I and the inclined component II respectively move forwards and backwards, and the movable backrest is adjusted to be in a proper lying position.

After the operation is finished, the main structure of the sitting and lying dual-purpose student chair and the office chair is in a fully-extended state when lying: when the seat part is horizontally moved and extended downwards and forwards along with the sliding pair and the inclined part assembly, the gravity center of the human body moves forwards along with the seat part; the support points of the inclined component I and the inclined component II extend forwards and backwards respectively, so that the contact area with the ground is increased; the movable backrest part is extended to a proper lying position, so that the lying position is stable, reliable and comfortable, and the lying with feet on the ground is realized. Lying on the ground with feet makes the lower limbs of the human body relax and smooth, and is beneficial to the circulation of channels and collaterals and blood vessels.

There are also two methods of operation to switch from lying to sitting.

The first method of operation: when the person leaves the chair, the control button of the controllable gas spring is operated, and the controllable gas spring still has a constant force after losing the locking force. The constant force of the controllable gas spring pushes the inclined component to retract inwards, so that the occupied area is reduced, the seat component moves upwards and backwards along with the sliding pair and the inclined component to retract, and is restored to the seat position and locked by the locking force of the controllable gas spring; the chair back component is enabled to rotate forwards, the left fixing piece and the right fixing piece move backwards, and under the respective action of the elasticity of the left elastic piece and the right elastic piece, the positioning grooves of the left fixing piece and the right fixing piece clamp the left positioning piece and the right positioning piece respectively, the chair back component is fixed in a sitting state, and the movable backrest component contracts to the lower side.

The second operation method comprises the following steps: the chair back component is operated according to the method, and then the sitting and lying switching component is operated according to the method. Similarly, the reclining assembly, the seat member and the seat back component are retracted to switch the reclining position to the seating position.

When the buffer piece is arranged on the sitting and lying switching component, the sitting and lying switching is stable and smooth.

The operation and action of the locking component which is a limiting piece for the mutual cutting of sitting and lying are as follows.

When the locking assembly is a limiting member, the seat/reclining switching member is preferably provided with a buffer member, and the elastic force of the buffer member preferably provides a sufficient upward force to the seat member.

When sitting, the limiting piece combines the front side piece and the rear side piece which form the moving kinematic pair. The back component is positioned by the tightening assembly. The movable backrest part is in the lower position.

The first method of operation: the limiting piece is operated firstly, the front side piece and the rear side piece which form the moving kinematic pair are loosened, the elasticity of the buffer piece is overcome by manpower, the seat piece is extended in a downward and forward translation mode along with the moving pair and the inclined piece assembly, and the supporting points of the inclined piece assembly I and the inclined piece assembly II move forwards and backwards respectively. In a proper position, the limiting piece is made to combine the front side piece and the back side piece of the moving kinematic pair, and the seat piece is locked. And then operating the left fixing piece and the right fixing piece to overcome the elasticity of the left elastic piece and the right elastic piece, wherein the positioning grooves of the left fixing piece and the right fixing piece are respectively separated from the left positioning piece and the right positioning piece to realize the backward rotation of the chair back component, and the left positioning pin and the right positioning pin respectively lean against the lower surfaces of the rear left side piece and the rear right side piece to be positioned at the lying position.

The second operation method comprises the following steps: the people sits or leaves the chair, operates left holding member and right holding member, overcomes left elastic component and right elastic component elasticity, and the constant head tank of left holding member and right holding member breaks away from left setting element and right setting element respectively, realizes the back of the chair part and changes, leans on the back left side spare and the back right side spare below respectively by left locating pin and right locating pin, fixes a position in the position of lying. And operating the limiting piece, loosening the front side piece and the rear side piece which form the moving kinematic pair, overcoming the elasticity of the elastic piece by manpower, horizontally moving and extending the seat piece downwards and forwards along with the moving pair and the inclined piece assembly, and respectively moving the supporting points of the inclined piece assembly I and the inclined piece assembly II forwards and backwards. In proper position, the limiting piece is used to combine the front and back parts of the moving kinematic pair and the seat part is locked. The movable backrest part is adjusted to be in a proper lying position.

There are also two methods of operation to switch from lying to sitting.

The first method of operation: the limiting piece is operated firstly, the front side piece and the rear side piece which form the moving pair are loosened, the seat piece is moved and contracted along with the moving pair and the inclined piece component in an upward and backward direction under the action of the elastic force of the buffer piece, the supporting points of the inclined piece component I and the inclined piece component II are respectively contracted backwards and forwards, and the floor area is reduced. After the seat is restored, the front side part and the rear side part which form the movable kinematic pair are combined together by the limiting piece, and the seat is locked. Then the chair back component is enabled to rotate forwards, the left fixing piece and the right fixing piece move backwards, and under the respective action of the elasticity of the left elastic piece and the right elastic piece, the positioning grooves of the left fixing piece and the right fixing piece respectively clamp the left positioning piece and the right positioning piece, the chair back component is fixed in a sitting state, and the movable backrest component contracts to the lower side.

II) operation of height adjustment of the seat member. The cross type main body mechanism and the locking assembly have the advantages that the height of the seat piece is adjusted greatly under the condition that the operation stroke of the locking assembly is small. The separate operation of the seat and recline switch member and the seat back member, in turn, allows this advantage to be fully exploited. And operating the locking assembly to lock the seat member after the seat member is lowered to a certain position or the lowest position. Firstly, when a plurality of limiting holes are formed in proper positions of the side piece, inserting a limiting piece into the proper limiting holes; secondly, when a plurality of limiting holes are formed in the proper positions of the inclined piece assembly, the limiting pieces are inserted into the proper limiting holes. And operating the locking assembly, pushing the seat part upwards by the constant force of the locking assembly until the relative positions of the front side part and the rear side part which form the moving kinematic pair are determined, limiting the seat part at the required height by the limiting part, and finishing the height adjustment of the seat part.

When the left inclined piece and the right inclined piece are in proper non-linear shapes, the cross inclined piece assembly I and the cross inclined piece assembly II can be prevented from possibly injuring a human body when the seat and the lying are switched.

When the pulley/universal pulley is arranged at the lower part of the inclined component, the friction damage of the lower part of the inclined component to the ground is greatly reduced when the seat and the bed are switched; the chair is convenient to move.

To sum up, the utility model adopts the cross type main body mechanism, the chair back and the seat frame can be separated or linked, so as to meet the requirements that the student chair for sitting and lying is telescopic, the feet are all put on the ground when sitting and lying, the adjustable range of the seat height is large, the use is convenient, reliable and comfortable, safety measures are provided, and the like, so as to adapt to the characteristics of crowded classrooms, tidiness, large height difference of students and the like; the requirements of enlarging the height adjusting range of the seat and the angle adjusting range of the chair back of the office chair for sitting and lying are met. Therefore, conditions are created for popularization and proper and good afternoon nap implementation of schools and offices, and development, physical and mental health and learning of primary and secondary school students are served; creates conditions for proper and good afternoon nap modes of office workers such as teachers and the like, serves physical and mental health and work of the office workers such as teachers and the like, and serves for improving the utilization rate of office places.

Drawings

The preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic left side view of a preferred embodiment of the main structure of a chair for students and office;

fig. 2 is a top view a of fig. 1 with the seat removed.

Detailed Description

The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings.

See fig. 1 and 2. The chair mainly comprises a sitting and lying switching frame component 1 and a chair back component 2, wherein the sitting and lying switching frame component 1 mainly comprises a diagonal member assembly 1-1, a side member 2-1, a seat member 3-1 and a locking assembly 4-1, the diagonal member assembly 1-1 comprises a transverse member 1-1-1, a left diagonal member 2-1-1 and a right diagonal member 3-1-1, one end of the transverse member 1-1-1 (shown by a dotted line in figure 1) is fixedly connected with the left diagonal member 2-1-1, the other end of the transverse member 1-1-1 is fixedly connected with the right diagonal member 3-1-1, the diagonal member assembly 1-1 is a diagonal member assembly I I-1-1 and a diagonal member assembly II-1-1, the diagonal member assembly I I-1-1 comprises a transverse member I1-I-1-1 (shown by a dotted line in figure 1), One end of a left inclined piece I2-I-1-1 and a right inclined piece I3-I-1-1 are fixedly connected, one end of a transverse piece I1-I-1-1 is fixedly connected with the left inclined piece I2-I-1-1, the other end of the transverse piece I1-I-1-1 is fixedly connected with the right inclined piece I3-I-1-1, an inclined piece assembly II-1-1 is composed of a transverse piece II1-II-1-1 (shown by a dotted line in figure 1), a left inclined piece II2-II-1-1 and a right inclined piece II3-II-1-1, one end of a transverse piece II1-II-1-1 is fixedly connected with a left inclined piece II2-II-1-1, the other end of a transverse piece II1-II-1-1 is fixedly connected with a right inclined piece II3-II-1-1, the left inclined piece 2-1-1 and the right inclined piece 3-1-1 are curved, namely the left inclined piece I2-I-1-1, the right inclined piece I3-I-1-1, the left inclined piece II2-II-1-1 and the right inclined piece II3-II-1-1 are curved, the left inclined piece I2-I-1-1 and the left inclined piece II2-II-1-1 are rotationally connected, the right inclined piece I3-I-1-1 and the right inclined piece II3-II-1-1 are rotationally connected, the inclined piece assembly I I-1-1 and the inclined piece assembly II-1-1 are crossed through the rotational connection, the side piece 2-1 is a left side piece Z-2-1 and a right side piece Y-2-1, the side piece 2-1 is formed by a front side piece 1-2-1 and a rear side piece 2-2 1 (shown by a dotted line in figure 1), a front part 1-2-1 and a rear part 2-2-1 form a moving kinematic pair, a left part Z-2-1 comprises a front left part 1-Z-2-1 and a rear left part 2-Z-2-1 (shown by a dotted line in figure 2), a front left part 1-Z-2-1 and a rear left part 2-Z-2-1 form a left moving kinematic pair, a right part Y-2-1 comprises a front right part 1-Y-2-1 and a rear right part 2-Y-2-1 (shown by a dotted line in figure 2), a front right part 1-Y-2-1 and a rear right part 2-Y-2-1 form a right moving kinematic pair, a rear left part 2-Z-2-1 and a rear right part 2-Y-2-1 Each of which is provided with 4 limit holes K (shown by dotted lines on figures 1 and 2) and a limit piece X, one end of a back left side piece 2-Z-2-1 is rotatably connected with the upper end of a left inclined piece I2-I-1-1, one end of a back right side piece 2-Y-2-1 is rotatably connected with the upper end of a right inclined piece I3-I-1-1, one end of a front left side piece 1-Z-2-1 is rotatably connected with the upper end of a left inclined piece II2-II-1-1, one end of a front right side piece 1-Y-2-1 is rotatably connected with the upper end of a right inclined piece II3-II-1-1, the inclined piece component 1-1 and the side piece 2-1 form a cross frame component J, the left side of a seat piece 3-1 is connected with the left side piece Z-2-1, the right side of the seat part 3-1 is connected with a right side part Y-2-1, the locking assembly 4-1 is a controllable gas spring assembly K-4-1, the controllable gas spring assembly K-4-1 is composed of a controllable gas spring rod small assembly 1-K-4-1, a connecting piece I2-K-4-1 (shown by a dotted line in figure 1), a connecting piece II3-K-4-1 (shown by a dotted line in figure 1) and a control button 4-K-4-1, the controllable gas spring rod small assembly 1-K-4-1 is composed of a sleeve piece 1-1-K-4-1 and a rod piece 2-1-K-4-1, the sleeve piece 1-1-K-4-1 and the rod piece 2-1-K-4-1 form a moving kinematic pair, one end of the controllable gas spring rod small component 1-K-4-1 is movably connected with a connecting piece I2-K-4-1, the other end of the controllable gas spring rod small component 1-K-4-1 is movably connected with a connecting piece II3-K-4-1, the connecting piece I2-K-4-1 is fixedly connected with a transverse piece I1-I-1-1 of the inclined piece component I I-1-1, the connecting piece II3-K-4-1 is fixedly connected with a transverse piece II1-II-1-1 of the inclined piece component II-1-1, and the control button 4-K-4-1 is fixedly connected with a seat piece 3-1. The buffer piece H is two tension springs L, two ends of one tension spring L are respectively connected to the right inclined piece I3-I-1-1 and the right inclined piece II3-II-1-1, and two ends of the other tension spring L are respectively connected to the left inclined piece I2-I-1-1 and the left inclined piece II 2-II-1-1. The rear left side part 2-Z-2-1 and the rear right side part 2-Y-2-1 are provided with a limiting part X and a plurality of limiting holes K. Cushion member H may also be disposed on rod 2-1-K-4-1 of controllable gas spring assembly K-4-1 (not shown). The two-dot chain line on the right of fig. 1 indicates a state where the seatback member 2 is lying down.

The chair back component 2 mainly comprises a back frame component 1-2 and a back rest component 2-2, the back frame component 1-2 comprises a back straight component 1-1-2 and a back cross component 2-1-2 (shown by dotted lines in figure 1), the back straight component 1-1-2 is a left back straight component 1-1-1-2 and a right back straight component 2-1-1-2, one end of the back cross component 2-1-2 is fixedly connected with the left back straight component 1-1-2, the other end of the back cross component 2-1-2 is fixedly connected with the right back straight component 2-1-1-2, the back rest component 2-2 comprises a fixed back rest component 1-2-2 and a movable back rest component 2-2, the fixed back rest component 1-2-2 is fixedly connected at the lower part of the back frame component 1-2, the movable backrest 2-2-2 is movably connected at the upper part of the back frame component 1-2. The chair back component 2 is connected with the cross frame component J through a fastening component 3-3, the left straight part 1-1-2 of the chair back component 2 is rotatably connected with the left inclined part I2-I-1-1 of the cross frame component J, the right straight part 2-1-2 of the chair back component 2 is rotatably connected with the right inclined part I3-I-1-1-1 of the cross frame component J, the fastening component 3-3 consists of a fastening component 1-3-3, a positioning pin 2-3-3, a positioning component 3-3-3 and an elastic component 4-3-3, the fastening component 3-3 is a left fastening component Z-3-3 and a right fastening component Y-3-3, the fastening component 1-3 is a left fastening component Z-1-3-3-3 and a right fastening component Y-1-3-3, the positioning pin 2-3-3 is a left positioning pin Z-2-3-3 and a right positioning pin Y-2-3-3, the positioning piece 3-3-3 is a left positioning piece Z-3-3 and a right positioning piece Y-3-3, the elastic piece 4-3-3 is a left elastic piece Z-4-3-3 and a right elastic piece Y-4-3-3, the left fastening component Z-3-3 is composed of a left fastening piece Z-1-3-3, a left positioning pin Z-2-3-3, a left positioning piece Z-3-3-3 and a left elastic piece Z-4-3-3, one end of the left fastening piece Z-1-3-3 is rotatably connected with the left back straight piece 1 through the left positioning pin Z-2-3-3 1-1-2, the other end of the left securing member Z-1-3-3 is provided with a positioning groove C (shown by a dotted line in figure 1), a left positioning member Z-3-3-3 is fixedly connected on the rear left member 2-Z-2-1, one end of a left elastic member Z-4-3-3 is connected on the left securing member Z-1-3-3, the other end of the left elastic member Z-4-3-3 is connected on the left positioning member Z-3-3-3, a right securing component Y-3-3 is composed of a right securing member Y-1-3-3, a right positioning pin Y-2-3-3, a right positioning member Y-3-3 and a right elastic member Y-4-3-3, one end of Y-1-3-3 of the right fixing piece is rotatably connected with the lower end of the right back straight piece 2-1-1-2 through a right positioning pin Y-2-3-3, the other end of Y-1-3-3 of the right fixing piece is provided with a positioning groove C, a right positioning piece Y-3-3-3 is fixedly connected on the back right side piece 2-Y-2-1, one end of a right elastic piece Y-4-3-3 is connected on the right fixing piece Y-1-3-3, and the other end of the right elastic piece Y-4-3-3 is connected on the right positioning piece Y-3-3-3. The transverse member I1-I-1-1 is provided with a universal pulley W.

Through the structure, the main structure of the sitting and lying dual-purpose student chair and the office chair has two operations of sitting and lying mutual cutting and seat height adjustment.

I) The operation and action of mutual cutting of sitting and lying.

When sitting, the sitting and lying switching part 1 is positioned and locked by the controllable gas spring component K-4-1; the chair back component 2 is positioned and locked by a locking component 3-3, the lower ends of a left straight back 1-1-1-2 and a right straight back 2-1-1-2 are respectively connected with the left fastening piece Z-1-3-3 and the right fastening piece Y-1-3-3 in a rotating way through a left positioning pin Z-2-3-3 and a right positioning pin Y-2-3-3, a positioning groove C at one end of the left fastening piece Z-1-3-3 and the right fastening piece Y-1-3-3 respectively clamps the left positioning piece Z-3-3-3 and the right positioning piece Y-3-3-3 under the respective action of the elasticity of the left elastic piece Z-4-3-3 and the right elastic piece Y-4-3-3-3, the seat back member 2 is fixed in the seating state. The two tension springs L provided on the cross frame assembly J are in a suitably tensioned state. The movable backrest 2-2-2 is in the lower position.

The first method of operation: when a person sits on the chair and operates the control button 4-K-4-1 of the controllable gas spring component K-4-1, the controllable gas spring component K-4-1 still has a constant force after losing the locking force. The gravity of the human body overcomes the constant force of the controllable gas spring component K-4-1 and the gradually increased elastic force of the two tension springs L, the seat component 3-1 is horizontally moved downwards and forwards along with the moving kinematic pair and the inclined component 1-1, the gravity center of the human body moves forwards along with the translation, and the supporting points of the inclined component I I-1-1 and the inclined component II-1-1 move forwards and backwards respectively. At the appropriate location, control button 4-K-4-1 of controllable gas spring assembly K-4-1 is released and seat member 3-1 is locked by controllable gas spring assembly K-4-1. The left fixing piece Z-1-3-3 and the right fixing piece Y-1-3-3 are operated, the elasticity of the left elastic piece Z-4-3-3 and the right elastic piece Y-4-3-3 is overcome, the positioning grooves C of the left fixing piece Z-1-3-3 and the right fixing piece Y-1-3-3 are separated from the left positioning piece Z-3-3-3 and the right positioning piece Y-3-3 respectively, the chair back component 1 is rotated backwards, the left positioning pin Z-2-3-3 and the right positioning pin Y-2-3-3 respectively lean against the lower surfaces of the rear left side piece 2-Z-2-1 and the rear right side piece 2-Y-2-1 and are positioned at the lying positions, and the movable backrest piece 2-2-2 is pulled upwards to the proper position.

The second operation method comprises the following steps: a person sits on or leaves the chair, operates the left fixing piece Z-1-3-3 and the right fixing piece Y-1-3-3, overcomes the elasticity of the left elastic piece Z-4-3-3 and the right elastic piece Y-4-3-3, and the positioning grooves C of the left fixing piece Z-1-3-3 and the right fixing piece Y-1-3-3 are respectively separated from the left positioning piece Z-3-3-3 and the right positioning piece Y-3-3 to realize the backward rotation of the chair back component 1, and is respectively leaned against the lower surfaces of the rear left side piece Z-2-2-1 and the rear right side piece Y-2-2-1 by the left positioning pin Z-2-3-3 and the right positioning pin Y-2-3-3, when the movable backrest is positioned at the lying position, the movable backrest 2-2-2 is pulled up to a proper position; when a person sits on the chair, the control button 4-K-4-1 of the controllable gas spring component K-4-1 is operated, a constant force is still provided after the controllable gas spring component K-4-1 loses the locking force, the gravity of the human body overcomes the constant force of the controllable gas spring component K-4-1 and the gradually increased elastic force of the two tension springs L, the seat component 3-1 is enabled to move downwards and forwards along with the moving pair and the inclined component 1-1, and the gravity center of the human body moves forwards along with the downward and forward movement of the seat component 3-1. Meanwhile, the supporting points of the inclined component I I-1-1 and the inclined component II-1-1 move forwards and backwards respectively, and the movable backrest 2-2-2 is adjusted to be in a proper lying position.

After the operation is finished, the main structure of the sitting and lying dual-purpose student chair and the office chair is in a fully-extended state when lying: when the seat part 3-1 is horizontally moved and extended downwards and forwards along with the sliding pair and the inclined part component 1-1, the gravity center of the human body moves forwards; the supporting points of the inclined component I I-1-1 and the inclined component II-1-1 extend forwards and backwards respectively, so that the grounding area is increased; the movable backrest 2-2-2 is extended to a proper lying position, so that the lying position is stable, reliable and comfortable, and the lying with feet on the ground is realized. Lying on the ground with feet makes the lower limbs of the human body relax and smooth, and is beneficial to the circulation of channels and collaterals and blood vessels.

There are also two methods of operation to switch from lying to sitting.

The first method of operation: when a person leaves the chair, the control button 4-K-4-1 of the controllable gas spring component K-4-1 is operated, and the controllable gas spring component K-4-1 still has a constant force after losing the locking force. The constant force of the controllable gas spring component K-4-1 pushes the inclined component 1-1 to retract inwards, so that the occupied area is reduced, the seat component 3-1 is translated and retracted upwards and backwards along with the sliding pair and the inclined component 1-1, and is restored to the seat position and locked by the locking force of the controllable gas spring component K-4-1; the chair back component 2 is enabled to rotate forwards, the left fixing piece Z-1-3-3 and the right fixing piece Y-1-3-3 move backwards, under the respective actions of the elasticity of the left elastic piece Z-4-3-3 and the right elastic piece Y-4-3-3, the positioning groove C of the left fixing piece Z-1-3-3 and the positioning groove C of the right fixing piece Y-1-3-3 respectively clamp the left positioning piece Z-3-3-3 and the right positioning piece Y-3-3-3, the chair back component 2 is fixed in a sitting state, and the movable backrest component 2-2-2 contracts to the lower side.

The second operation method comprises the following steps: the backrest part 2 is operated according to the above method, and then the sitting/lying switching part 1 is operated according to the above method. Similarly, the reclining assembly 1-1, the seat member 3-1 and the backrest part 2 are retracted to switch the reclining position to the sitting position.

The two tension springs L are arranged, so that the sitting and lying can be switched stably and smoothly. The universal pulleys W arranged at the lower ends of the left inclined piece 2-1-1 and the right inclined piece 3-1-1 can greatly reduce the friction damage of the lower part of the inclined piece component to the ground when the seat and the bed are switched; the chair is convenient to move. The left oblique piece 2-1-1 and the right oblique piece 3-1-1 are curved, so that the cross oblique piece assembly I I-1-1 and the oblique piece assembly II-1-1 can be prevented from possibly injuring human bodies when the sitting and lying are switched.

II) operation of height adjustment of the seat member. The technical scheme has the structural characteristic that the height of the seat piece is adjusted greatly under the condition that the operation stroke of the controllable gas spring component K-4-1 is small. The separate operation of the seat and reclining switch member 1 and the backrest member 2, in turn, makes this advantage fully applicable. The controllable gas spring assembly K-4-1 is operated, and the seat member 3-1 is lowered to a certain position or the lowest position and then locked. A plurality of limiting holes K are arranged on the rear left side part 2-Z-2-1 and the rear right side part 2-Y-2-1. Two limiting pieces X are respectively inserted into suitable holes of the rear left side piece 2-Z-2-1 and the rear right side piece 2-Y-2-1. Then the controllable gas spring component K-4-1 is operated, the seat part 3-1 moves upwards under the action of the constant force of the controllable gas spring component K-4-1 and the elasticity of the two tension springs L until the relative positions of the front side part 1-2-1 and the rear side part 2-2-1 forming the moving pair are determined, the seat part 3-1 is limited at the required height by the limiting part X, and the height adjustment of the seat part 3-1 is completed.

To sum up, the utility model discloses a crossing main body mechanism, back of the chair and seat frame can transfer or the linkage, satisfy sit dual-purpose student chair of lying telescopic, sit when lying foot all put on ground, the seat height adjustable range is big, convenient to use, reliable, comfortable and have requirements such as safety measure to adapt to the crowded characteristics such as crowded nevertheless neatly of classroom and student's height difference are big, satisfy and increase the requirement of sitting dual-purpose office chair seat height adjustment scope of lying and back of the chair angular adjustment. Therefore, conditions are created for popularization and proper and good afternoon nap implementation of schools and offices, and development, physical and mental health and learning of primary and secondary school students are served; creates conditions for proper and good afternoon nap modes of office workers such as teachers and the like, serves physical and mental health and work of the office workers such as teachers and the like, and serves for improving the utilization rate of office places.

Claims

1. A main body structure of a sitting and lying dual-purpose student chair and a sitting and lying dual-purpose office chair is mainly composed of a sitting and lying switching frame component and a chair back component, and is characterized in that the sitting and lying switching frame component (1) mainly comprises an inclined piece component (1-1), a side piece (2-1), a seat piece (3-1) and a locking component (4-1), the inclined piece component (1-1) is composed of a transverse piece (1-1-1), a left inclined piece (2-1-1) and a right inclined piece (3-1-1), one end of the transverse piece (1-1-1) is fixedly connected with a proper position of the left inclined piece (2-1-1), the other end of the transverse piece (1-1-1) is fixedly connected with a proper position of the right inclined piece (3-1-1), the inclined component (1-1) is an inclined component I (I-1-1) and an inclined component II (II-1-1), the transverse component (1-1-1) is an inclined component I (1-I-1-1) and an inclined component II (1-II-1-1), the left inclined component (2-1-1) is a left inclined component I (2-I-1-1) and a left inclined component II (2-II-1-1), the right inclined component (3-1-1) is a right inclined component I (3-I-1-1) and a right inclined component II (3-II-1-1), one end of the transverse component I (1-I-1-1) is fixedly connected with a proper position of the left inclined component I (2-I-1-1), the other end of the transverse member I (1-I-1-1) is fixedly connected with a proper position of the right inclined member I (3-I-1-1) and forms the inclined member assembly I (I-1-1) by the other end, one end of the transverse member II (1-II-1-1) is fixedly connected with a proper position of the left inclined member II (2-II-1-1), the other end of the transverse member II (1-II-1-1) is fixedly connected with a proper position of the right inclined member II (3-II-1-1) and forms the inclined member assembly II (II-1-1) by the other end, the proper position of the left inclined member I (2-I-1-1) is rotatably connected with the proper position of the left inclined member II (2-II-1-1), the right inclined piece I (3-I-1-1) and the right inclined piece II (3-II-1-1) are rotatably connected at a proper position, the inclined piece assembly I (I-1-1) and the inclined piece assembly II (II-1-1) form a cross shape through the rotary connection, the side pieces (2-1) are a left side piece (Z-2-1) and a right side piece (Y-2-1), the side piece (2-1) consists of a front side piece (1-2-1) and a rear side piece (2-2-1), the front side piece (1-2-1) and the rear side piece (2-2-1) form a moving motion pair, and the left side piece (Z-2-1) consists of a front left side piece (1-Z-2-1) and a rear left side piece (2-1) -Z-2-1), said front left member (1-Z-2-1) and said rear left member (2-Z-2-1) forming a left shifting kinematic pair, said right member (Y-2-1) comprising a front right member (1-Y-2-1) and a rear right member (2-Y-2-1), said front right member (1-Y-2-1) and said rear right member (2-Y-2-1) forming a right shifting kinematic pair, one end of said rear left member (2-Z-2-1) and an upper end of said left ramp I (2-I-1-1) being pivotally connected, one end of said rear right member (2-Y-2-1) and an end of said right ramp I (3-I-1-1) being pivotally connected The upper end of the front left side part (1-Z-2-1) is rotatably connected with the upper end of the left inclined part II (2-II-1-1), one end of the front right side part (1-Y-2-1) is rotatably connected with the upper end of the right inclined part II (3-II-1-1), the inclined part assembly (1-1) and the side part (2-1) form a cross frame assembly (J), the left side of the seat part (3-1) is connected with the left side part (Z-2-1), the right side of the seat part (3-1) is connected with the right side part (Y-2-1), the locking assembly (4-1) is arranged at a proper position of the cross frame assembly (J), the chair back component (2) mainly comprises a back frame component (1-2) and a back rest component (2-2), the back frame component (1-2) comprises a back straight component (1-1-2) and a back transverse component (2-1-2), the back straight component (1-1-2) comprises a left back straight component (1-1-1-2) and a right back straight component (2-1-1-2), one end of the back transverse component (2-1-2) is fixedly connected to the proper position of the left back straight component (1-1-1-2), the other end of the back transverse component (2-1-2) is fixedly connected to the proper position of the right back straight component (2-1-1-2), the back rest component (2-2) is connected to the back frame component (1-2), the chair back component (2) is connected to the proper position of the cross frame component (J).

2. The main structure of the chair for students and offices, as claimed in claim 1, wherein the locking assembly (4-1) is disposed at a proper position of the cross frame assembly (J) by: the locking assembly (4-1) mainly comprises an upper moving piece, a lower moving piece and a fixing piece, wherein one end of the upper moving piece is connected to a proper position of the inclined piece assembly I (I-1-1), one end of the lower moving piece is connected to a proper position of the inclined piece assembly II (II-1-1), the upper moving piece and the lower moving piece are movably connected, and the fixing piece is connected to the upper moving piece and the lower moving piece.

3. The main structure of the chair for students and offices, as claimed in claim 1, wherein the locking assembly (4-1) is disposed at a proper position of the cross frame assembly (J) by: the locking assembly (4-1) is a controllable gas spring assembly (K-4-1), the controllable gas spring assembly (K-4-1) is composed of a controllable gas spring rod small assembly (1-K-4-1), a connecting piece I (2-K-4-1), a connecting piece II (3-K-4-1) and a control button (4-K-4-1), the controllable gas spring rod small assembly (1-K-4-1) is composed of a sleeve piece (1-1-K-4-1) and a rod piece (2-1-K-4-1), the sleeve piece (1-1-K-4-1) and the rod piece (2-1-K-4-1) form a moving kinematic pair, one end of the controllable gas spring rod small component (1-K-4-1) is connected with the connecting piece I (2-K-4-1), the other end of the controllable gas spring rod small component (1-K-4-1) is connected with the connecting piece II (3-K-4-1), the connecting piece I (2-K-4-1) is connected to a proper position of the inclined piece component I (I-1-1), the connecting piece II (3-K-4-1) is connected to a proper position of the oblique piece component II (II-1-1), the control button (4-K-4-1) is arranged on a proper position of the sitting and lying switching frame component (1).

4. The main structure of the chair for students and offices, as claimed in claim 1, wherein the locking assembly (4-1) is disposed at a proper position of the cross frame assembly (J) by: the locking component (4-1) is a limiting piece which is fixedly connected with one side piece (2-1) of the front side piece (1-2-1) and the rear side piece (2-2-1) which form the moving kinematic pair, and the limiting piece is movably connected with the other side piece (2-1).

5. A main structure of a chair for students and offices, characterized in that, the chair back component (2) is connected to the cross frame component (J) at a proper position, which is realized by the following steps: the upper ends of the left straight back part (1-1-1-2) and the left inclined part (2-1-1) of the cross frame component (J) are fixedly connected, and the upper ends of the right straight back part (2-1-1-2) of the chair back component (2) and the right inclined part (3-1-1) of the cross frame component (J) are fixedly connected.

6. A main structure of student chair for sitting and lying and office chair for sitting and lying according to claim 1, characterized in that the backrest part (2) is connected to the cross frame assembly (J) at a proper position by a fastening assembly (3-3): the upper ends of the left straight back part (1-1-1-2) of the chair back part (2) and the left inclined part I (2-I-1-1) of the cross frame component (J) are movably connected, the upper ends of the right straight back part (2-1-2) of the chair back part (2) and the right inclined part I (3-I-1-1) of the cross frame component (J) are movably connected, the fastening component (3-3) consists of a fastening component (1-3-3), a positioning pin (2-3-3), a positioning component (3-3-3) and an elastic component (4-3-3), the fastening component (3-3) is a left fastening component (Z-3-3) and a right fastening component (Y-3-3), the positioning parts (1-3-3) are a left positioning part (Z-1-3-3) and a right positioning part (Y-1-3-3), the positioning pins (2-3-3) are a left positioning pin (Z-2-3-3) and a right positioning pin (Y-2-3-3), the positioning parts (3-3-3) are a left positioning part (Z-3-3-3) and a right positioning part (Y-3-3-3), the elastic parts (4-3-3) are a left elastic part (Z-4-3-3) and a right elastic part (Y-4-3-3), and the left positioning part (Z-3-3) consists of the left positioning part (Z-1-3-3), A left positioning pin (Z-2-3-3), a left positioning piece (Z-3-3-3) and a left elastic piece (Z-4-3-3), wherein one end of the left positioning piece (Z-1-3-3) is rotatably connected to a proper position at the lower end of the left back straight piece (1-1-1-2) of the chair back component (2) through the left positioning pin (Z-2-3-3), the other end of the left positioning piece (Z-1-3-3) is provided with a positioning groove (C), the left positioning piece (Z-3-3-3) is fixedly connected to a proper position of the rear left side piece (2-Z-2-1) of the cross frame component (J), one end of the left elastic piece (Z-4-3-3) is connected to the left positioning piece (Z-1-3-3), the other end of the left elastic component (Z-4-3-3) is connected with the left positioning component (Z-3-3-3), the right fastening component (Y-3-3) consists of a right fastening component (Y-1-3-3), a right positioning pin (Y-2-3-3), a right positioning component (Y-3-3) and a right elastic component (Y-4-3-3), one end of the right fastening component (Y-1-3-3) is rotatably connected with the proper position at the lower end of the right straight component (2-1-1-2) of the chair back component (2) through the right positioning pin (Y-2-3-3), the other end of the right positioning piece (Y-1-3-3) is provided with a positioning groove (C), the right positioning piece (Y-3-3-3) is arranged at a proper position of the rear right piece (2-Y-2-1) of the cross frame assembly (J), one end of the right elastic piece (Y-4-3-3) is connected at a proper position of the right positioning piece (Y-1-3-3), and the other end of the right elastic piece (Y-4-3-3) is connected at the right positioning piece (Y-3-3).

7. The main structure of the chair for student and office in sitting and lying as claimed in claim 1, wherein the left and right inclined members (2-1-1, 3-1-1) are non-linear.

8. The main structure of the chair for student and office in sitting and lying according to claim 1, wherein a buffer member (H) is disposed at a suitable position of the switching frame member (1).

9. The main structure of the chair for student and office use of sitting and lying as claimed in claim 1, wherein a position limiting member (X) and a plurality of position limiting holes (K) are disposed at suitable positions of the cross frame assembly (J).

10. The main structure of the chair for student and office in sitting and lying according to claim 1, wherein the inclined member assembly (1-1) is provided with a pulley (W) at a proper position of the lower part.