CN216089699U

CN216089699U - Rear-mounted leg rest device of chair

Info

Publication number: CN216089699U
Application number: CN202120385023.4U
Authority: CN
Inventors: 韩宝兴; 张玉华; 韩康
Original assignee: Jiangshan Qiqizheng Electromechanical Technology Co ltd
Current assignee: Jiangshan Qiqizheng Electromechanical Technology Co ltd
Priority date: 2021-02-06
Filing date: 2021-02-06
Publication date: 2022-03-22
Anticipated expiration: 2031-02-06

Abstract

The utility model relates to a chair rear footrest device, which consists of a seat frame component and a footrest component, wherein the seat frame component is respectively connected with a left upper side piece, a right upper side piece, a left lower side piece and a right lower side piece through the upper end and the lower end of a left straight piece and a right straight piece, and is formed by connecting the two ends of a transverse piece with the left straight piece and the right straight piece. The footrest part consists of a seat part and a connecting part. The leg rest components with two main structures of a parallelogram frame and a box-type sliding type are formed by connecting a left connecting piece, a right connecting piece, a left lower side piece and a right lower side piece. When in use, the footrest component is arranged at the rear part of the seat frame component and used for placing a footrest by a user arranged behind the footrest component. The utility model adopts a reverse thinking method, uses a chair rear-arranged leg rest device, integrates the advantages of two types of multifunctional sitting and reclining chairs in the prior art, is particularly suitable for solving the problem of noon break in a classroom of primary and secondary school students of which chairs are easy to be arranged in series, and reclaims the sitting and reclining chair of the primary and secondary school students in an virgin place, thereby serving the physical and mental health of the primary and secondary school students.

Description

Rear-mounted leg rest device of chair

Technical Field

The utility model relates to the technical field of education equipment and furniture, in particular to a chair rear-mounted leg rest device.

Background

The chair rear footrest device refers to a footrest device positioned at the rear part of a chair seat frame when a footrest is carried out; the chair front footrest referred to herein is a footrest located in front of the chair seat frame when the footrest is present. The chair with the rear footrest is different from the chair with the front footrest in that the former footrest is mainly provided for the user arranged behind the chair and the latter footrest is mainly provided for the user sitting on the chair.

The prior art chairs for office and study mainly have two categories according to their functions: one is a single-seat functional chair; one is a multi-functional sitting/reclining chair. The deficiency of the single-seat functional chair: the feet can only keep one posture and are placed on the ground one by one; the space under the seat is not utilized. On the occasion that the chairs are arranged in series, the two defects of the single functional chair are obvious: one is as follows: the comfort level or rest of the lower limbs and the human body can not be met by adjusting the high-low postures of the feet; the second step is as follows: when doing some things, the single leg rest posture can not meet the requirements under various conditions, for example, the feet are lifted, and the operation of placing a laptop and the like on the thigh is convenient; and thirdly, when the user objects are more, no place is placed. Multifunctional sitting/resting chairs are suitable for afternoon nap and rest, and currently, there are two types: one is that the leg rest device of the chair is preposed, for example, the multifunctional sitting reclining chair/noon break chair popular in the market, when sitting, the leg rest device is arranged below the chair seat, three operation actions are required for the mutual switching of sitting and lying, the chair is pulled out or pushed from the chair seat, the leg rest is turned over forwards or backwards, the chair back is turned forwards or backwards, and when lying, the feet are rested on the leg rest device. The utility model has the advantages of comfortable lying position, and the disadvantages of more occupied space and area and inconvenient operation. Is not suitable for narrow and convenient operation occasions. For another example, the technical solution of "a leg rest device of a sitting and lying seat with a parallelogram as a main mechanism" in application No. 202021790620.7 is also a front leg rest device. Its advantage is that the position of lying is comfortable, sits to lie and surely only needs an operation action each other, more is fit for the occasion of simple operation, and it is not suitable narrow occasion to be not enough. The other type is without leg rest, such as three technical schemes of ' telescopic sitting and lying office and learning chair ' with patent number ZL201721517914.0, ' main structure of ' sitting and lying dual-purpose student chair and sitting and lying dual-purpose office chair ' with application number 202020169118.8 and ' linkage mechanism of seat back and seat ' with patent number ZL 202021790729.0. The seat is lain and is cut each other and only need an operation action, the simple operation, and when lying the position, the foot is put on ground. Compared with the products with the front footrest devices, the multifunctional sitting lounge chair/noon break chair without the footrest devices has the advantages that the multifunctional sitting lounge chair/noon break chair is more suitable for narrow and small occasions and occasions with more convenient and faster operation besides common occasions; the disadvantage is that the comfort of the footrest/lying position is less than that of products with front footrest devices, for some people. In some occasions, such as the classrooms of primary and secondary schools in narrow and small occasions, the multifunctional sitting and lying student chairs are easy to be arranged in series, the advantages of the multifunctional sitting and lying student chairs are more needed to be fused, the defects of the multifunctional sitting and lying student chairs are overcome, the narrow and small places and the occasions which are more convenient and fast to operate can be met, and the better comfort level of the leg rest/lying position can be guaranteed. In view of the above-mentioned situation of the single-function and multi-function chair, there is a need for a new multi-function chair to meet these requirements, and is particularly suitable for solving the problems of nap and nap of groups in narrow occasions, such as the problem of noon break of students in the classroom of primary and secondary schools. The technical scheme adopts a reverse thinking method, improves the prior front footrest device into a rear footrest device, and tries to solve the problems.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims to provide a chair rear footrest device which comprises: the multifunctional sitting deck chair/noon break chair integrates the advantages of two types of multifunctional sitting deck chairs/noon break chairs in the prior art, overcomes the defects of the two types of multifunctional sitting deck chairs/noon break chairs, meets the requirements of being suitable for narrow places or reducing occupied area and space of the places, meets the occasions needing convenience in operation, and can ensure better comfort of a leg rest/lying position. The rear footrest device is particularly suitable for solving the problems of afternoon nap and rest of primary and secondary school students which are easy to be arranged in series in front and back in a classroom, and is used for reclaiming the sitting and lying lounge chair for the primary and secondary school students in a virgin area; secondly, the utilization rate of the chairs with single functions can be improved on the occasions that the chairs with single functions are arranged in series front and back; and market adaptability of other related products is improved.

In order to achieve the main object, the present invention is achieved by the following technical means. A chair rear footrest device mainly comprises a seat frame component and a footrest component, wherein the seat frame component mainly comprises an upper frame component, a lower frame component, a frame cross component and a frame straight component, the upper frame component mainly comprises an upper side component and a seat component, the upper side component comprises a left upper side component and a right upper side component, the left side of the seat component is connected with the left upper side component, the right side of the seat component is connected with the right upper side component, the lower frame component mainly comprises a lower side component, the lower side component comprises a left lower side component and a right lower side component, the frame straight component comprises a left frame straight component and a right frame straight component, the upper end of the left frame straight component is fixedly connected with the left upper side component of the upper frame component, the lower end of the left frame straight component is fixedly connected with the left lower side component of the lower frame component, the upper end of the right frame straight component is fixedly connected with the right upper side component, the lower end of the right frame straight component is fixedly connected with the right lower side of the lower frame component, one end of the frame cross member is fixedly connected with the left frame straight member, and the other end of the frame cross member is fixedly connected with the right frame straight member. The bracket part mainly comprises a foot placing piece and a connecting piece, the connecting piece is a left connecting piece and a right connecting piece, the left side of the foot placing piece is connected with one end of the left connecting piece, the other end of the left connecting piece is connected with the left side of the seat frame part, the right side of the foot placing piece is connected with one end of the right connecting piece, and the other end of the right connecting piece is connected with the right side of the seat frame part.

The left side straight piece of putting up straight piece and left lower frame straight piece on the left side, left side straight piece of putting up with left side straight piece link firmly, left lower frame straight piece with left lower side piece link firmly, left side straight piece of putting up with left lower frame straight piece connect for the vice connection that removes that can shift, right side straight piece of putting up be right side straight piece and right lower frame straight piece, right side straight piece with right side straight piece link firmly, right lower frame straight piece with right lower side piece link firmly, right side straight piece with right lower frame straight piece connect for the vice connection that removes that can shift.

The foot rest component is a foot rest component I, the connecting piece is a connecting piece I, the connecting piece I is a left connecting piece I and a right connecting piece I, the left connecting piece I is a front left connecting piece I and a rear left connecting piece I, one end of the front left connecting piece I is connected with the front end of the left side of the foot rest component I, the other end of the front left connecting piece I is connected with the proper position of the rear part of the left lower side component, one end of the rear left connecting piece I is connected with the rear end of the left side of the foot rest component I, the other end of the rear left connecting piece I is connected with the other proper position of the rear part of the left lower side component, the right connecting piece I is a front right connecting piece I and a rear right connecting piece I, one end of the front right connecting piece I is connected with the front end of the right side of the foot rest component I, the other end of the front right connecting piece I is connected with the proper position of the rear part of the right lower side component, one end of the rear right connecting piece I is connected to the rear end of the right side of the leg rest piece I, and the other end of the rear right connecting piece I is connected to another proper position at the rear part of the right lower side piece.

One end of the front left connecting piece I is rotatably connected to the front end of the left side of the leg rest piece I, the other end of the front left connecting piece I is rotatably connected to a proper position at the rear part of the left lower side piece, one end of the rear left connecting piece I is rotatably connected to the rear end of the left side of the leg rest piece I, the other end of the rear left connecting piece I is rotatably connected to another proper position at the rear part of the left lower side piece, one end of the front right connecting piece I is rotatably connected to the front end of the right side of the leg rest piece I, the other end of the front right connecting piece I is rotatably connected to a proper position at the rear part of the right lower side piece, one end of the rear right connecting piece I is rotatably connected to the rear end of the right side of the leg rest piece I, and the other end of the rear right connecting piece I is rotatably connected to another proper position at the rear part of the right lower side piece, the left four-bar assembly composed of the front left connecting piece I, the rear left connecting piece I, the leg rest piece I and the left lower side piece is a left parallelogram mechanism, the right four-bar assembly composed of the front right connecting piece I, the rear right connecting piece I, the leg rest piece I and the right lower side piece is a right parallelogram mechanism, the left parallelogram mechanism, the right parallelogram mechanism and the leg rest piece I are composed into a parallelogram frame, and a limiting piece is arranged on the parallelogram frame.

And a damping piece is arranged on the parallelogram frame.

The bracket part be bracket part II, the bracket piece be bracket piece II, the connecting piece be connecting piece II, connecting piece II be left connecting piece II and right connecting piece II, the left side of bracket piece II with left connecting piece II's one end connect, left connecting piece II's the other end with left side frame straight piece connect, the right of bracket piece with right connecting piece II's one end connect, right connecting piece II's the other end with right side frame straight piece connect.

The bracket part be bracket part III, the bracket part be bracket III, the connecting piece be connecting piece III, connecting piece III be left connecting piece III and right connecting piece III, the left side of bracket III with the one end of left connecting piece III be connected, the other end of left connecting piece III with left side piece remove vice the connection, the right of bracket III with right side connecting piece III one end connect, right side connecting piece III the other end with right side piece remove vice the connection.

The connection between the leg rest piece III and the connecting piece III is realized by the following steps: the connecting piece III is a left connecting piece III and a right connecting piece III, the front end and the rear end of the left connecting piece III and the right connecting piece III are fixedly connected with blocking pieces respectively, the blocking pieces fixedly connected to the front ends of the left connecting piece III and the right connecting piece III are front blocking pieces, the blocking pieces fixedly connected to the rear ends of the left connecting piece III and the right connecting piece III are rear blocking pieces, the upper end of one blocking piece is rotatably connected with one end of the leg rest piece III, the lower end of the left connecting piece III and the lower end of the right connecting piece III are fixedly connected with the left end and the right end of the lower sliding piece respectively, long grains C are arranged on the left lower piece and the right lower piece, and the lower sliding piece is connected with the long grain moving pair on the left lower piece and the right lower piece.

With the above structure, the operation and action of the chair rear footrest device are as follows.

Since the operation and action of the single-seat functional chair rear footrest device are the same as those of the multi-functional reclining/noon break chair rear footrest device, the following describes the operation and action of the multi-functional reclining/noon break chair footrest device by taking two structures as examples.

The leg rest component is of a parallelogram frame structure. When the footrest part I is not used or is not in the noon nap season, the footrest part I of the footrest part I is at the lowest position in front of the footrest part I, and articles such as bags and the like can be placed on the footrest part I. When the leg rest member I is to be used, the bag or the like placed on the leg rest member I is removed, the leg rest member I is pulled upward and rearward, and the leg rest member I is translated upward and rearward to a position defined by the stopper. A rear user, lying on the multi-functional reclining/noon break chair, may rest his feet on the leg rest I of the front chair. When the footrest part I is used, the footrest part I is pushed forward, and the footrest part I is translated forwards and downwards to the original lowest position. When the damping member is provided on the parallelogram frame, the damping member functions: the leg rest component I is stably cut at high and low positions; the state of the foot rest part I is stable in a high position and a low position.

And the leg rest part III is of a box type sliding structure. And a footrest part III of the box type sliding structure is used for opening the footrest part III when the footrest part is in the footrest position and is not in the footrest position, and the article can be accessed. The front and back dragging of the footrest part III is realized through the movable connection of the lower slide piece, the left lower side piece and the long groove C arranged on the right lower side piece. When the leg rest is needed, the leg rest component III is pulled back to the needed position, and when the leg rest is not needed, the leg rest component III is pushed back to the original position.

In summary, the present invention provides a chair rear footrest device: the multifunctional sitting deck chair/noon break chair integrates the advantages of two types of multifunctional sitting deck chairs/noon break chairs in the prior art, overcomes the defects of the two types of multifunctional sitting deck chairs/noon break chairs, meets the requirements of being suitable for narrow places or reducing occupied area and space of the places, meets the occasions with more convenient and fast operation, and can ensure better comfort of a foot rest/lying position. The multifunctional sitting deck chair/noon break chair with the rear footrest device is particularly suitable for solving the problems of noon break and rest in classrooms of primary and secondary school students which are easy to be arranged in series, and is used for reclaiming the sitting deck chair of the primary and secondary school students who are still in a virgin area; secondly, the utilization rate of the chairs with single functions can be improved on the occasions that the chairs with single functions are arranged in series front and back; and market adaptability of other related products is improved.

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 a chair rear footrest;

FIG. 2 is a schematic top view A of FIG. 1;

FIG. 3 is a schematic left side view of another preferred embodiment of a chair rear footrest;

fig. 4 is a schematic top view of fig. 3 from B.

Detailed Description

Examples of the present invention are described in detail below with reference to the accompanying drawings.

See fig. 1 and 2. The first embodiment mainly comprises a seat frame component 1 and a foot rest component 2, the seat frame component 1 mainly comprises an upper frame component 1-1, a lower frame component 2-1, a frame cross component 3-1 (shown by a dotted line in figure 1) and a frame straight component 4-1, the upper frame component 1-1 mainly comprises an upper side component 1-1-1 and a seat component 2-1-1 (shown by a double-dashed line in figure 2), the upper side component 1-1-1 is a left upper side component 1-1-1 and a right upper side component 2-1-1-1, the left side of the seat component 2-1-1 is fixedly connected with the left upper side component 1-1-1, the right side of the seat component 2-1-1 is fixedly connected with the right upper side component 2-1-1, the lower frame component 2-1 mainly comprises a lower side component 1-2-1, the lower side part 1-2-1 is a left lower side part 1-1-2-1 and a right lower side part 2-1-2-1, the straight frame part 4-1 is a left straight frame part 1-4-1 and a right straight frame part 2-4-1, the left straight frame part 1-4-1 is a left upper straight frame part 1-1-4-1 (shown by a dotted line in figure 2) and a left lower straight frame part 2-1-4-1 (shown by a dotted line in figure 2), the left upper straight frame part 1-1-4-1 and the left lower straight frame part 2-1-4-1 are movable pair connections with adjustable positions, the left upper straight frame part 1-1-4-1 is fixedly connected with the left upper side part 1-1-1, the left lower straight frame part 2-1-4-1 is fixedly connected with the left lower side part 1-1-2-1, the right straight part 2-4-1 is a right upper straight part 1-2-4-1 (shown by a dotted line in figure 2) and a right lower straight part 2-2-4-1 (shown by a dotted line in figure 2), the right upper straight part 1-2-4-1 and the right lower straight part 2-2-4-1 are connected by a movable pair with adjustable positions, the right upper straight part 1-2-4-1 is fixedly connected with the right upper part 2-1-1-1, the left lower straight part 2-1-4-1 is fixedly connected with the left lower part 1-1-2-1, and the right lower straight part 2-2-4-1 is fixedly connected with the right lower part 2-1-2-1. One end of the transverse frame component 3-1 is fixedly connected with the left lower frame straight component 2-1-4-1, and the other end of the transverse frame component 3-1 is fixedly connected with the right lower frame straight component 2-2-4-1. The foot rest part 2 mainly comprises a foot rest part 1-2 and a connecting piece 2-2 (shown by a dotted line in figure 1), wherein the connecting piece 2-2 is a left connecting piece 1-2-2 and a right connecting piece 2-2-2, the left side of the foot rest part 1-2 is connected with one end of the left connecting piece 1-2-2, the other end of the left connecting piece 1-2-2 is connected with the left position of the seat frame part 1, the right side of the foot rest part 1-2 is connected with one end of the right connecting piece 2-2-2, and the other end of the right connecting piece 2-2-2 is connected with the right position of the seat frame part 1.

The first example is that the foot rest part 2 is a foot rest part II-2, the foot rest part 1-2 is a foot rest part I1-I-2, the connecting part 2-2 is a connecting part I2-I-2 (shown by a dotted line in figure 1), the connecting part I2-I-2 is a left connecting part I1-2-I-2 and a right connecting part I2-2-I-2, the left connecting part I1-2-I-2 is a front left connecting part IQ-1-2-I-2 (shown by a dotted line in figure 1 and figure 2) and a rear left connecting part IH-1-2-I-2 (shown by a dotted line in figure 1), one end of the front left connecting part IQ-1-2-I-2 is rotatably connected with the front end on the left side of the foot rest part I1-I-2, and the other end of the front left connecting part IQ-1-2-I-2 is rotatably connected with the left lower side One end of a rear left connecting piece IH-1-2-I-2 is rotatably connected with the rear end of the left side of the foot rest I1-I-2 at the rear position of the piece 1-1-2-1, the other end of the rear left connecting piece IH-1-2-I-2 is rotatably connected with the other position of the rear part of the left lower side piece 1-1-2-1, a right connecting piece I2-2-I-2 is a front right connecting piece IQ-2-2-I-2 (shown by dotted lines in figures 1 and 2) and a rear right connecting piece IH-2-2-I-2 (shown by dotted lines in figure 1), one end of the front right connecting piece IQ-2-2-I-2 is rotatably connected with the front end of the right side of the foot rest I1-I-2, the other end of the front right connecting piece IQ-2-2-I-2 is rotatably connected with the rear part of the right lower side piece 2-1-2-1, one end of the rear right connecting piece IH-2-2-I-2 is rotatably connected with the rear end of the right side of the foot rest piece I1-I-2, and the other end of the rear right connecting piece IH-2-2-I-2 is rotatably connected with the rear part of the right lower side piece 2-1-2-1. The two limiting pieces X are respectively fixedly connected to the left lower side piece 1-1-2-1 and the right lower side piece 2-1-2-1. The damping member N of the first embodiment is a gas spring Q, one end of the compressed gas spring Q is rotatably connected to the left lower member 1-1-2-1, and the other end thereof is rotatably connected to the leg rest member I1-I-2. A left four-bar component Z-G consisting of a front left connecting piece IQ-1-2-I-2, a rear left connecting piece IH-1-2-I-2, a leg rest piece I1-I-2 and a left lower side piece 1-1-2-1 is a left parallelogram mechanism Z-P, the right four-bar assembly Y-G consisting of the front right connecting piece IQ-2-2-I-2, the rear right connecting piece IH-2-2-I-2, the leg rest piece I1-I-2 and the right lower side piece 2-1-2-1 is a right parallelogram mechanism Y-P, and the left parallelogram mechanism Z-P, the right parallelogram mechanism Y-P and the leg rest piece I1-I-2 form a parallelogram frame P-K. The footrest member II-2 is shown in a rear high position by a two-dot chain line in fig. 1.

See fig. 3, 4. The second example is that the foot rest part 2 is a foot rest part IIIIII-2, the foot rest parts 1-2 are foot rest parts III1-III-2, the connecting part 2-2 is a connecting part III2-III-2, the connecting part III2-III-2 is a left connecting part III1-2-III-2 (shown by dotted lines in figure 4) and a right connecting part III2-2-III-2 (shown by dotted lines in figure 4), the left side of the foot rest part III1-III-2 is connected with the left connecting part III1-2-III-2, the right side of the foot rest part III1-III-2 is connected with the right connecting part 2-2-III-2, and the front end and the rear end of the left connecting part III1-2-III-2 and the right connecting part III2-2-III-2 are respectively connected with a part D (shown by dotted lines in figure 3), the stopper D fixedly connected with the front ends of the left connecting piece III1-2-III-2 and the right connecting piece III2-2-III-2 is a front stopper QD (shown by a dotted line in figure 4), the stopper D fixedly connected with the rear ends of the left connecting piece III1-2-III-2 and the right connecting piece III2-2-III-2 is a rear stopper HD (shown by a dotted line in figure 4), the rear stopper HD is rotatably connected with the rear end of the leg rest III1-III-2 through a hinge, the lower end of the left connecting piece III1-2-III-2 and the lower end of the right connecting piece III2-2-III-2 are fixedly connected with the left end and the right end of the lower sliding piece XB (shown by a dotted line in figure 3), and the long grooves C (shown by a dotted line in figure 3) are arranged on the left lower side piece 1-1-2-1 and the right lower side piece 2-1-2-1, Shown by dotted lines in fig. 4), the lower slide member XB is slidably connected with the long groove C on the left lower member 1-1-2-1 and the right lower member 2-1-2-1. Fig. 3 shows a state where the footrest part 2 is at the rear portion, as indicated by the two-dot chain line.

With the above configuration, the operation and operation of the chair rear footrest device are as follows.

One, the operations and actions of example one. The footrest part II-2 of the first example is of a parallelogram frame P-K structure.

When the footrest part II-2 is not used or the afternoon nap season is not in use, the footrest I1-I-2 of the footrest part II-2 is stabilized at the lowest position of the front part by the gas spring Q, and the footrest I1-I-2 can be placed with articles such as bags. When the leg rest part II-2 is used, articles such as bags and the like placed on the leg rest I1-I-2 are taken off, the leg rest part II-2 is pulled backwards and upwards, and after the leg rest I1-I-2 is translated backwards and upwards to a certain node, the leg rest I1-I-2 is pushed by the compressed gas spring Q and is stabilized at the position limited by the limiting piece. A rear user, lying on the multi-function lounge/noon break chair, rests his feet on the foot rest I1-I-2 of the front chair. After the foot rest part II-2 is used, the foot rest part II-2 is pushed forwards, the foot rest I1-I-2 translates forwards and downwards to a certain node, and the foot rest I1-I-21-2 is pushed by the gas spring Q and is stabilized on the original lowest position again.

Second, example two operations and actions. The footrest part IIIIII-2 of the second example has a box-type sliding structure. The footrest part IIIIII-2 of the box type sliding structure opens the footrest part III1-III-2 when the footrest is needed or not needed, and the article can be accessed. The front and back dragging of the foot-rest component IIIIII-2 is realized through the sliding connection of the lower sliding plate XB and the long lees C arranged on the left lower side part 1-1-2-1 and the right lower side part 2-1-2-1. When the leg rest is needed, the leg rest part IIIIII-2 is pulled back to the needed position, and when the leg rest is not needed, the leg rest part IIIIII-2 is pushed back to the original position.

In summary, the present invention provides a chair rear footrest device: the multifunctional sitting and lying chair has the advantages of integrating the advantages of two types of multifunctional sitting and lying chairs in the prior art, making up the defects of the two types of multifunctional sitting and lying chairs, meeting the requirements of being suitable for narrow places or reducing occupied areas and spaces of the places, meeting the occasions needing convenience in operation and ensuring better comfort of foot resting/lying positions. The multifunctional sitting deck chair/noon break chair with the rear footrest device is particularly suitable for solving the problems of noon break and rest in classrooms of primary and secondary school students which are easy to be arranged in series, and the middle and primary school students who still sit in virgo land are reclaimed; secondly, the utilization rate of the chairs with single functions can be improved on the occasions that the chairs with single functions are arranged in series front and back; and market adaptability of other related products can be improved.

Claims

1. A chair rear footrest device mainly comprises a seat frame component and a footrest component, and is characterized in that the seat frame component (1) mainly comprises an upper frame component (1-1), a lower frame component (2-1), a cross frame component (3-1) and a straight frame component (4-1), the upper frame component (1-1) mainly comprises an upper side component (1-1-1) and a seat component (2-1-1), the upper side component (1-1-1) comprises a left upper side component (1-1-1-1) and a right upper side component (2-1-1-1), the left side of the seat component (2-1-1) is connected with the left upper side component (1-1-1-1), the right side of the seat component (2-1-1) is connected with the right upper side component (2-1-1-1) The lower frame component (2-1) is mainly a lower side part (1-2-1), the lower side part (1-2-1) is a left lower side part (1-1-2-1) and a right lower side part (2-1-2-1), the frame straight part (4-1) is a left frame straight part (1-4-1) and a right frame straight part (2-4-1), the upper end of the left frame straight part (1-4-1) is fixedly connected with the left upper side part (1-1-1-1) of the upper frame component (1-1), the lower end of the left frame straight part (1-4-1) is fixedly connected with the left lower side part (1-1-2-1) of the lower frame component (2-1), the upper end of the right frame straight piece (2-4-1) is fixedly connected with the right upper side piece (2-1-1-1) of the upper frame component (1-1), the lower end of the right frame straight piece (2-4-1) is fixedly connected with the right lower side piece (2-1-2-1) of the lower frame component (2-1), one end of the frame cross piece (3-1) is fixedly connected with the left frame straight piece (1-4-1), the other end of the frame cross piece (3-1) is fixedly connected with the right frame straight piece (2-4-1), the foot rest component (2) mainly comprises a foot rest piece (1-2) and a connecting piece (2-2), the connecting piece (2-2) comprises a left connecting piece (1-2-2) and a right connecting piece (2-2-2), the left side of the foot rest (1-2) is connected with one end of the left connecting piece (1-2-2), the other end of the left connecting piece (1-2-2) is connected with the left position of the seat frame component (1), the right side of the foot rest (1-2) is connected with one end of the right connecting piece (2-2-2), and the other end of the right connecting piece (2-2-2) is connected with the right position of the seat frame component (1).

2. The chair rear footrest device according to claim 1, characterized in that the left straight rack (1-4-1) is a left upper straight rack (1-1-4-1) and a left lower straight rack (2-1-4-1), the left upper straight rack (1-1-4-1) is fixedly connected with the left upper straight rack (1-1-1-1), the left lower straight rack (2-1-4-1) is fixedly connected with the left lower straight rack (1-1-2-1), the left upper straight rack (1-1-4-1) and the left lower straight rack (2-1-4-1) are connected with a position-adjustable moving pair, and the right straight rack (2-4-1) is a right upper straight rack (1-2-4-1) and a left lower straight rack (2-1-1) are connected with a position-adjustable moving pair The right lower straight part (2-2-4-1), the right upper straight part (1-2-4-1) is fixedly connected with the right upper part (2-1-1-1), the right lower straight part (2-2-4-1) is fixedly connected with the right lower part (2-1-2-1), and the right upper straight part (1-2-4-1) is connected with the right lower straight part (2-2-4-1) through a movable pair capable of being adjusted in position.

3. The chair back footrest device according to claim 1, characterized in that the footrest part (2) is footrest part I (I-2), the footrest part (1-2) is footrest part I (1-I-2), the connecting part (2-2) is connecting part I (2-I-2), the connecting part I (2-I-2) is left connecting part I (1-2-I-2) and right connecting part I (2-2-I-2), the left connecting part I (1-2-I-2) is front left connecting part I (Q-1-2-I-2) and rear left connecting part I (H-1-2-I-2), and one end of the front left connecting part I (Q-1-2-I-2) is connected to the footrest part I (I-1-2-I-2) The left front end of the piece I (1-I-2), the other end of the front left connecting piece I (Q-1-2-I-2) is connected with a proper position at the back of the left lower piece (1-1-2-1), one end of the back left connecting piece I (H-1-2-I-2) is connected with the left back end of the leg rest piece I (1-I-2), the other end of the back left connecting piece I (H-1-2-I-2) is connected with another proper position at the back of the left lower piece (1-1-2-1), the right connecting piece I (2-2-I-2) is a front right connecting piece I (Q-2-2-I-2) and a back right connecting piece I (H-2-2-I-2), one end of the front right connecting piece I (Q-2-2-I-2) is connected to the front end of the right side of the leg rest piece I (1-I-2), the other end of the front right connecting piece I (Q-2-2-I-2) is connected to a proper position of the rear part of the right lower side piece I (2-1-2-1), one end of the rear right connecting piece I (H-2-2-I-2) is connected to the rear end of the right side of the leg rest piece I (1-I-2), and the other end of the rear right connecting piece I (H-2-2-I-2) is connected to another proper position of the rear part of the right lower side piece I (2-1-2-1).

4. The chair rear footrest device according to claim 3, wherein one end of the front left connecting member I (Q-1-2-I-2) is rotatably connected to the front end of the left side of the footrest member I (1-I-2), the other end of the front left connecting member I (Q-1-2-I-2) is rotatably connected to the rear end of the rear portion of the left lower member (1-1-2-1), one end of the rear left connecting member I (H-1-2-I-2) is rotatably connected to the rear end of the left side of the footrest member I (1-I-2), the other end of the rear left connecting member I (H-1-2-I-2) is rotatably connected to the other suitable position of the rear portion of the left lower member (1-1-2-1), one end of the front right connecting piece I (Q-2-2-I-2) is rotationally connected with the front end on the right side of the foot rest piece I (1-I-2), the other end of the front right connecting piece I (Q-2-2-I-2) is rotationally connected with a proper position on the rear part of the right lower side piece I (2-1-2-1), one end of the rear right connecting piece I (H-2-2-I-2) is rotationally connected with the rear end on the right side of the foot rest piece I (1-I-2), the other end of the rear right connecting piece I (H-2-2-I-2) is rotationally connected with another proper position on the rear part of the right lower side piece I (2-1-2-1), a left four-bar linkage (Z-G) consisting of the front left connecting piece I (Q-1-2-I-2), the rear left connecting piece I (H-1-2-I-2), the leg rest piece I (1-I-2) and the left lower side piece (1-1-2-1) is a left parallelogram mechanism (Z-P), and a right four-bar linkage (Y-G) consisting of the front right connecting piece I (Q-2-2-I-2), the rear right connecting piece I (H-2-2-I-2), the leg rest piece I (1-I-2) and the right lower side piece (2-1-2-1) is a right parallelogram mechanism (Y-P), a parallelogram frame (P-K) is formed by the left parallelogram mechanism (Z-P), the right parallelogram mechanism (Y-P) and the leg rest piece I (1-I-2), and a limiting piece (X) is arranged on the parallelogram frame (P-K).

5. A chair back footrest according to claim 4, characterized in that the parallelogram frame (P-K) is provided with damping elements (N).

6. The chair back footrest device according to claim 1, characterized in that the footrest part (2) is a footrest part II, the footrest parts (1-2) are footrest parts II, the connecting parts (2-2) are connecting parts II, the connecting parts II are a left connecting part II and a right connecting part II, the left side of the footrest part II is connected with one end of the left connecting part II, the other end of the left connecting part II is connected with the left straight part (1-4-1), the right side of the footrest part II is connected with one end of the right connecting part II, and the other end of the right connecting part II is connected with the right straight part (2-4-1).

7. The chair back footrest according to claim 1, characterized in that the footrest part (2) is a footrest part III (III-2), the footrest part (1-2) is a footrest part III (1-III-2), the connecting part (2-2) is a connecting part III (2-III-2), the connecting part III (2-III-2) is a left connecting part III (1-2-III-2) and a right connecting part III (2-2-III-2), the left side of the footrest part III (1-III-2) is connected with one end of the left connecting part III (1-2-III-2), the other end of the left connecting part III (1-2-III-2) is connected with the left lower side part (1-1-2-1) moving pair, the right side of the foot rest part III (1-III-2) is connected with one end of the right connecting part III (2-2-I-2), and the other end of the right connecting part III (2-2-III-2) is connected with the right lower side part (2-1-2-1) sliding pair.

8. A chair back footrest according to claim 7, characterized in that the connection of the footrest III (1-III-2) and the connecting element III (2-III-2), the moving pair connection of the connecting element III (2-III-2) and the lower element (1-2-1) is realized as follows: the front end and the rear end of the left connecting piece III (1-2-III-2) and the right connecting piece III (2-2-III-2) are fixedly connected with a stopper (D) respectively, the stoppers (D) fixedly connected with the front ends of the left connecting piece III (1-2-III-2) and the right connecting piece III (2-2-III-2) are front stoppers (QD), the stopper (D) fixedly connected with the rear ends of the left connecting piece III (1-2-III-2) and the right connecting piece III (2-2-III-2) is a rear stopper (HD), the upper end of one stopper (D) is rotatably connected with one end of the foot rest piece (1-III-2), the lower end of the left connecting piece III (1-2-III-2) is rotatably connected with the right connecting piece III (2-2-III-2) The lower end of the lower slider (XB) is fixedly connected with the left end and the right end of the lower slider (XB), a long groove (C) is arranged on the left lower side piece (1-1-2-1) and the right lower side piece (2-1-2-1), and the lower slider (XB) is connected with a moving pair of the long groove (C) on the left lower side piece (1-1-2-1) and the right lower side piece (2-1-2-1).