Foot rest device

Abstract

The utility model provides a footrest device which comprises a first bearing part, a second bearing part and a third bearing part which are sequentially connected and respectively form a first bearing surface, a second bearing surface and a third bearing surface. The footrest device has a folded state and a tiled state, and in the tiled state, the first bearing face, the second bearing face and the third bearing face are located on the same plane and jointly form a complete footrest bearing face. In the folding state, the first bearing face, the second bearing face and the third bearing face are stacked up and down. Compared with the prior art, in the tiled state, the foot rest device can form a foot rest bearing face with a larger area, the legs and the feet of the human body are placed on the first bearing part, the second bearing part and the third bearing part and are borne by the foot rest bearing face in an attached mode, the bearing face with the larger area can reduce the pressure intensity, and therefore the foot rest device is more convenient to use. Therefore, the oppression of the footrest device on the legs and feet of the human body is relieved and even eliminated, and the use comfort is improved.

Description

Technical Field

[0001] The utility model relates to the field of furniture, in particular to a footrest device. Background Art

[0002] Chairs are office furniture for people to sit on when working or studying. Office workers will feel tired after sitting for a long time. In order to relieve work fatigue, office workers need to rest and relax after sitting for a long time. Traditional office chairs are composed of backrests, seat cushions and supporting legs. The positions of backrests and seat cushions are relatively fixed, and people cannot lie down to rest. Office workers usually need to purchase furniture suitable for lying down to realize sitting and working, but this requires office space and is not suitable for offices with narrow space.

[0003] Some existing office chairs are equipped with footrests. When using these office chairs for rest, the footrests can be pulled open and the user's legs and feet can be placed thereon to improve the comfort during rest. However, on existing office chairs, the width of the footrests in the front-to-back direction is too narrow, which gives a strong sense of pressure to the legs and feet of the human body. After using them for a long time, people feel uncomfortable and even numbness in the legs and feet. Some footrests used on sofas and other seating furniture have a length that provides sufficient comfort, but are not conducive to storage and are not suitable for office chairs. Summary of the invention

[0004] In order to solve the above technical problems, the utility model provides a footrest device, comprising a first supporting part, a second supporting part and a third supporting part, which are connected in sequence and respectively form a first supporting surface, a second supporting surface and a third supporting surface; the footrest device has a folded state and a flat state, in which the first supporting surface, the second supporting surface and the third supporting surface are in the same plane and together constitute a complete footrest supporting surface; in the folded state, the first supporting surface, the second supporting surface and the third supporting surface are stacked up and down; compared with the prior art, in the flat state, the footrest device The arrangement can form a larger footrest supporting surface, and the human body's legs and feet are placed on the first supporting part, the second supporting part and the third supporting part and are supported by the footrest supporting surface. The larger supporting surface can reduce the pressure, thereby reducing or even eliminating the pressure of the footrest on the human body's legs and feet, thereby improving the comfort of use. Furthermore, compared with the existing large-area footrest, the footrest device can switch between states and has a folding state. In the folded state, it is more compact, which reduces the space occupied, and can be adapted to more different types of seats, especially office chairs that pursue simplicity and lightness instead of sofas.

[0005] The technical solution of the utility model is achieved in this way:

[0006] A footrest device comprises a first supporting portion, a second supporting portion and a third supporting portion, wherein the first supporting portion, the second supporting portion and the third supporting portion are connected in sequence; a first supporting surface is formed on the first supporting portion, a second supporting surface is formed on the second supporting portion, and a third supporting surface is formed on the third supporting portion; the footrest device has a folded state and a flat state, wherein in the flat state, the first supporting surface, the second supporting surface and the third supporting surface are in the same plane and together constitute a complete footrest supporting surface; in the folded state, the first supporting surface, the second supporting surface and the third supporting surface are stacked up and down.

[0007] Compared with the prior art, in the flat state, the footrest device can form a larger footrest supporting surface, and the human body's legs and feet are placed on the first supporting part, the second supporting part and the third supporting part and supported by the footrest supporting surface. The larger supporting surface can reduce the pressure, thereby reducing or even eliminating the pressure of the footrest device on the human body's legs and feet, thereby improving the comfort of use. Furthermore, compared with the existing large-area footrest, the footrest device can switch states and has a folding state. In the folded state, it is more compact, reduces the occupied space, and can be adapted to more different types of seats, especially office chairs that pursue simplicity and lightness instead of sofas.

[0008] Preferably, in the folded state, the first supporting part, the second supporting part and the third supporting part are stacked in sequence from bottom to top; in the flat state, the first supporting part, the second supporting part and the third supporting part are arranged in sequence from front to back. In the folded state and the flat state, the relative positions of the first supporting part, the second supporting part and the third supporting part are different, so that the shape of the footrest device changes, and the change of its shape can produce different benefits for different states. For example, in the flat state, the straight shape allows the first supporting surface, the second supporting surface and the third supporting surface to form a complete footrest supporting surface together, which is conducive to comfortable footresting of the human body. In the folded state, the stacked shape is more conducive to the storage of the footrest device.

[0009] Preferably, when switching from the folded state to the flat state, the first supporting part flips forward from below the second supporting part, and the third supporting part flips backward from above the second supporting part, and the first supporting part and the third supporting part rotate clockwise or counterclockwise. In the folded state, the first supporting part and the third supporting part are at different positions in the vertical direction of the second supporting part, but when the first supporting part and the third supporting part rotate, they rotate in the same direction, and appear at different positions in the front-rear direction of the second supporting part after the rotation is completed.

[0010] Preferably, the length of the footrest device in the flat state is greater than that in the folded state. Similarly, the thickness of the footrest device in the flat state is less than that in the folded state; in the folded state, the footrest device can have a shorter length, which is conducive to being folded under the seat cushion. In the flat state, the footrest device can have a longer length while having a width similar to that of an ordinary footrest, and can also have a larger supporting area, which can support from the human foot to the human thigh, thereby dispersing pressure and reducing the sense of oppression.

[0011] Preferably, in the flat state, the first supporting surface, the second supporting surface and the third supporting surface are all facing upward; in the folded state, the first supporting surface and the third supporting surface are all facing downward, and the second supporting surface is facing upward. In the flat state, the first supporting surface, the second supporting surface and the third supporting surface are facing upward to support the legs and feet of the human body. In the folded state, the first supporting part, the second supporting part and the third supporting part are folded from the flat state, thereby changing the direction of the first supporting surface and the second supporting surface.

[0012] Preferably, the first supporting part includes a first frame, the second supporting part includes a second frame, and the third supporting part includes a third frame. Sponge cushions are provided on the first frame, the second frame and the third frame.

[0013] Preferably, the first supporting part includes a first frame, the second supporting part includes a second frame, and the third supporting part includes a third frame, and mesh cloth is stretched on the first frame, the second frame and the third frame.

[0014] Preferably, the first supporting part and the third supporting part are both flipped and arranged on the second supporting part; a driving structure is provided between the second supporting part and the third supporting part, a driven structure is provided between the second supporting part and the first supporting part, a push-pull member is provided between the driving structure and the driven structure, and the driving structure, the driven structure and the push-pull member are configured so that when the third supporting part flips relative to the second supporting part, the first supporting part flips relative to the second supporting part under the action of the driving structure, the push-pull member and the driven structure. When the third supporting part moves, the driving structure, the push-pull member and the driven structure transmit and give the first supporting part a force in the same direction, so as to realize the same-direction linkage between the third supporting part and the first supporting part, so that the state switching of the footrest device is convenient and quick to operate.

[0015] Preferably, the driving structure includes a first connecting rod, a second connecting rod, a first guide groove structure arranged between the first connecting rod and the third supporting part, and a second guide groove structure arranged between the second connecting rod and the second supporting part; the driven structure includes a third guide groove structure arranged between the push-pull member and the first supporting part; the first connecting rod is rotatably connected to the first folding plate, the second connecting rod and the push-pull member respectively, and the second connecting rod is rotatably connected to the second folding plate; the end of the first supporting part is rotatably connected to the end of the second supporting part; and a third connecting rod is further arranged between the second supporting part and the push-pull member. This solution can realize the synchronous linkage of the first supporting part and the third supporting part, and is easy to operate; the guide groove structure can realize the relative rotation between the two rods, and can also provide a margin for relative movement between the two rods, so that the linkage is carried out smoothly and motion interference is prevented.

[0016] Preferably, the first guide groove structure includes a first guide groove and a first sliding member, the first guide groove is provided on the third supporting part, the first sliding member is arranged on the first connecting rod, and the first sliding member is arranged in the first guide groove; the second guide groove structure includes a second guide groove and a second sliding member, the second guide groove is provided on the third supporting part, the second sliding member is arranged on the second connecting rod, and the second sliding member is arranged in the second guide groove; the third guide groove structure includes a third guide groove and a third sliding member, the third guide groove is provided on the first supporting part, the third sliding member is arranged on the push-pull member, and the third sliding member is arranged in the third guide groove. When the supporting part moves, the sliding member can move back and forth in the corresponding guide groove to realize the relative movement between the rods.

[0017] The design starting point, concept and beneficial effects of the utility model using the above technical solution are:

[0018] Compared with the prior art, in the flat state, the footrest device can form a larger footrest supporting surface, and the human body's legs and feet are placed on the first supporting part, the second supporting part and the third supporting part and supported by the footrest supporting surface. The larger supporting surface can reduce the pressure, thereby reducing or even eliminating the pressure of the footrest device on the human body's legs and feet, thereby improving the comfort of use. Furthermore, compared with the existing large-area footrest, the footrest device can switch states and has a folding state. In the folded state, it is more compact, reduces the occupied space, and can be adapted to more different types of seats, especially office chairs that pursue simplicity and lightness instead of sofas. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the footrest device in a flat state in the embodiment of the utility model;

[0020] Figure 2 It is a side view of the footrest device in a flat state in the embodiment of the utility model;

[0021] Figure 3 It is a schematic diagram of the three-dimensional structure of the footrest device when switching between a flat state and a folded state in an embodiment of the utility model;

[0022] Figure 4 A side view of the footrest device when switching between a flat state and a folded state in an embodiment of the utility model;

[0023] Figure 5 It is a three-dimensional structural schematic diagram of the footrest device in the folded state in the embodiment of the utility model;

[0024] Figure 6 A side view of the footrest device in the folded state in the embodiment of the utility model;

[0025] Figure 7 The three-dimensional structure of the seat and the footrest device in the embodiment of the utility model is shown in FIG. Figure 1 ;

[0026] Figure 8 The three-dimensional structure of the seat and the footrest device in the embodiment of the utility model is shown in FIG. Figure 2 ;

[0027] Fig. 9 It is a schematic diagram of the footrest device being unfolded and folded on the seat in the embodiment of the utility model;

[0028] Fig.10 It is a schematic diagram of a seating area formed on a seat in an embodiment of the present invention;

[0029] Fig.11 It is a schematic diagram of the first supporting surface, the second supporting surface and the third supporting surface constituting the footrest supporting surface in the flat-laying state in the embodiment of the utility model;

[0030] Fig.12 It is a schematic diagram of the first supporting surface, the second supporting surface and the third supporting surface stacked in a folded state in an embodiment of the present invention.

[0031] The figures are marked as follows: middle support assembly 1; upper support assembly 2; lower support assembly 3; seat 4; telescopic assembly 5; accommodating space 6; base 7; second frame 8; push-pull member 9; middle guide groove 10; middle guide member 11; third frame 12; first connecting rod 13; second connecting rod 14; third connecting rod 15; first frame 16; first guide groove 17; first sliding member 18; third guide groove 19; third sliding member 20; second guide groove 21; second sliding member 22; first supporting surface 101; second supporting surface 102; third supporting surface 103; footrest supporting surface 100. DETAILED DESCRIPTION

[0032] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0033] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0034] In the description of the present invention, the terms "first", "second", "third", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0035] The specific implementation of the utility model is as follows:

[0036] like Fig.11 , 12 As shown, the utility model provides a footrest device, comprising a first supporting portion, a second supporting portion and a third supporting portion, the first supporting portion, the second supporting portion and the third supporting portion are connected in sequence; a first supporting surface 101 is formed on the first supporting portion, a second supporting surface 102 is formed on the second supporting portion, and a third supporting surface 103 is formed on the third supporting portion; the footrest device has a folded state and a flat state, in the flat state, the first supporting surface 101, the second supporting surface 102 and the third supporting surface 103 are in the same plane and the three together constitute a complete footrest supporting surface 100; in the folded state, the first supporting surface 101, the second supporting surface 102 and the third supporting surface 103 are stacked up and down.

[0037] Compared with the prior art, in the flat state, the footrest device can form a larger footrest supporting surface 100, and the human legs and feet are placed on the first supporting part, the second supporting part and the third supporting part and supported by the footrest supporting surface 100. The larger supporting surface can reduce the pressure, thereby reducing or even eliminating the pressure of the footrest device on the human legs and feet, thereby improving the comfort of use. Furthermore, compared with the existing large-area footrest, the footrest device can switch states and has a folding state. In the folded state, it is more compact, which reduces the space occupied, and can be adapted to more different types of seats, especially office chairs that pursue simplicity and lightness instead of sofas.

[0038] Specifically, the comparison of the footrest device in two states is as follows: in the folded state, the first supporting part, the second supporting part and the third supporting part are stacked in sequence from bottom to top; in the flat state, the first supporting part, the second supporting part and the third supporting part are arranged in sequence from front to back; the length of the footrest device in the flat state is greater than the length in the folded state, and the thickness of the footrest device in the flat state is less than the thickness in the folded state; in the flat state, the first supporting surface 101, the second supporting surface 102 and the third supporting surface 103 are all facing upwards; in the folded state, the first supporting surface 101 and the third supporting surface 102 are all facing downwards, and the second supporting surface 103 is facing upwards.

[0039] The first supporting part includes a first frame 16, the second supporting part includes a second frame 8, and the third supporting part includes a third frame 12. Sponge cushions are arranged on the first frame 16, the second frame 8 and the third frame 12. It is also feasible to stretch mesh cloth on the first frame 16, the second frame 8 and the third frame 12. Therefore, the supporting part includes a frame and a sponge cushion. A driving structure, a push-pull member and a driven structure are arranged between the first supporting part, the second supporting part and the third supporting part.

[0040] like Figure 1-6 As shown, the footrest device specifically includes a middle support component 1, at least one upper support component 2 and at least one lower support component 3 in terms of movement structure. The upper support component 2 and the lower support component 3 are respectively arranged at the two ends of the middle support component 1. The upper support component 2 and the lower support component 3 are both rotatably arranged relative to the middle support component 1, and the upper support component 2 and the lower support component 3 are linked through the middle support component 1; the footrest device has a folded state and a flat state. In the folded state, the upper support component 2 is located above the middle support component 1, and the lower support component 3 is located below the middle support component 1, and the footrest device is in a multi-layer stacked state; in the flat state, the upper support component 2 and the lower support component 3 are The footrest device is respectively located on the front and rear sides of the middle support assembly 1, and is in a single-layer flat state; when switching from a folded state to a flat state, the upper support assembly 2 is located above the middle support assembly 1 and rotates and unfolds to one side of the middle support assembly 1 in the front-to-back direction, and under the linkage action of the upper support member and the lower support member, the lower support assembly 3 is located below the middle support assembly 1 and unfolds to the other side of the middle support assembly 1 in the front-to-back direction; when switching from a flat state to a folded state, the upper support assembly 2 rotates toward the top of the middle support assembly 1 to fold the upper support assembly 2, and under the linkage action of the upper support member and the lower support member, the lower support assembly 3 rotates toward the bottom of the middle support assembly 1 to fold the lower support assembly 3.

[0041] The footrest device has a multi-section support component, which can support the human leg and footsteps over a large area in terms of support area, reduce the sense of oppression, and greatly improve the comfort of use; structurally, the multi-section support component generates lower packaging and transportation costs, and can switch between stacking and flat states to reduce the occupied space; in terms of operation, the linkage feature makes the operation simpler and more convenient.

[0042] like Figure 7-10 As shown, the footrest is applied to a chair, which includes a seat 4 and the footrest as described above. The seat 4 and the footrest are connected by a telescopic assembly 5. The telescopic assembly 5 is configured such that the footrest extends forward in front of the seat 4 when the telescopic assembly 5 is extended, and the footrest is retracted under the seat 4 when the telescopic assembly 5 is retracted. The lower front part of the seat 4 is recessed to form an accommodating space 6. When the telescopic assembly 5 is retracted, the footrest is retracted in the accommodating space 6 in a folded state. When the telescopic assembly 5 is retracted, the footrest is retracted in the accommodating space 6 in a folded state, so as to reduce the space utilization rate and enhance the integrity of the seat. The structure is reasonable and more beautiful. After the telescopic assembly 5 is extended, the footrest can be flattened in front of the seat 4 to provide a wide range of comfortable leg and foot support.

[0043] Furthermore, in order to take into account reasonable space utilization, ergonomics and comfort of use, the footrest device is designed with an automatic tilting function; specifically, the footrest device also includes a base 7, and the middle support assembly 1 is rotatably arranged on the base 7, and the middle support assembly 1 includes the second frame 8 and the push-pull member 9; the second frame 8 is rotatably connected to the base 7, the push-pull member 9 is connected to the base 7 through a guide groove structure, and the push-pull member 9 is connected to the second frame 8 through two swing connecting rods arranged at intervals; the push-pull member 9 is configured to move from a folded state to a flat state, and the push-pull member 9 is moved under the action of the guide groove structure. , driving the second frame 8 to rotate relative to the base 7, and in the flat state, the upper support assembly 2, the middle support assembly 1 and the lower support assembly 3 are all inclined with the front lower and the back higher; further, a middle guide groove 10 is opened on the push-pull member 9, and the middle guide groove 10 is a waist-shaped groove with the middle part bent upward. A middle guide member 11 is provided on the base 7, and the middle guide member 11 is arranged in the middle guide groove 10. When the footrest device switches between the flat state and the folded state, the middle guide groove 10 moves relative to the middle guide member 11, and the push-pull member 9 drives the second frame 8 to rotate relative to the base 7.

[0044] This solution realizes the automatic tilting function of the footrest device, that is, when in the flat state, the middle support component 1, the upper support component 2 and the lower support component 3 can all be tilted at a certain angle, so that the human legs and feet can naturally rest on the footrest device, thereby improving comfort; in the folded state, the three can return to a horizontal posture and can be snugly folded back under the seat 4; further, two swing connecting rods arranged at intervals make the second frame 8, the push-pull member 9 and the connecting rod therebetween constitute a four-bar linkage, thereby realizing the linkage of the second frame 8 and the push-pull member 9; the middle guide groove 10 is a waist-shaped groove with an upward bend in the middle, which is the basis for automatic tilting, and the second frame 8 and the push-pull member 9 are rotated relative to the base 7 by changing the different positions and angles of the middle guide member 11 in the middle guide groove 10. The main function of the middle guide groove 10 and the middle guide member 11 is to realize that the footrest device has an angle change in the folded state and the flat state, especially in the flat state, the tilted footrest can better adapt to ergonomics.

[0045] In order to realize the synchronous movement of the upper support assembly 2 and the lower support assembly 3, in this embodiment, the upper support assembly 2 includes the third frame 12, the first connecting rod 13 and the second connecting rod 14, the middle support assembly 1 includes the third connecting rod 15 and the second frame 8 and the push-pull member 9, and the lower support assembly 3 includes the first frame 16; the first connecting rod 13 and the third frame 12 are connected by a first guide groove structure, the second connecting rod 14 is rotatably connected to the third frame 12 and the first connecting rod 13, and the second connecting rod 14 is connected to the second frame 8 by a second guide groove structure; the second frame The rear end of the frame 8 is connected to the rear end of the push-pull member 9 through the first connecting rod 13, and the front of the second frame 8 is connected to the front of the push-pull member 9 through the third connecting rod 15; the first frame 16 is rotatably connected to the front end of the second frame 8, and the first frame 16 is connected to the front end of the push-pull member 9 through the third guide groove structure; when the third frame 12 is driven to move, the third frame 12 drives the first connecting rod 13 and the second connecting rod 14 to move, and the first connecting rod 13 and the second connecting rod 14 drive the second frame 8 and the push-pull member 9 to move relative to each other, and the relative movement of the second frame 8 and the push-pull member 9 can drive the first frame 16 to move. In this solution, the upper support assembly 2 and the lower support assembly 3 can achieve synchronous movement. When the upper support assembly 2 is unfolded, the lower support assembly 3 is also unfolded, and the operation is convenient and simple.

[0046] If only the third frame 12 and the first frame 16 are required to rotate relative to the second frame 8, it is only necessary to rotatably connect the third frame 12 and the first frame 16 to the second frame 8. However, if the synchronous movement of the third frame 12 and the first frame 16 is to be achieved, a plurality of linkage parts are indispensable between the three. The linkage parts in this embodiment are connecting rods and guide groove structures. The connecting rods are used for connection and transmission, while the guide groove structure is used to specify the motion trajectory, so that the whole can achieve linkage while performing preset actions; such as the second frame 8, the push-pull member 9 and the connecting rod therebetween constitute a four-bar linkage mechanism, the purpose of the guide groove structure is to leave a movement margin, the guide member can move back and forth in the guide groove structure, and at the same time, the relative rotation between the two rods can be achieved. Since the guide member can move back and forth in the guide groove and rotate relative to the guide groove, the relative rotation and movement between the two rods can be achieved. At the same time, the guide groove provides a limit for the guide member, thereby ensuring the standardization and smoothness of the overall movement.

[0047] Specifically, the guide groove structure between the third frame 12 and the first connecting rod 13 includes a first guide groove 17 and a first sliding member 18, the first sliding member 18 is arranged at the end of the first connecting rod 13, the first guide groove 17 is opened on the third frame 12, and the first sliding member 18 is arranged in the first guide groove 17; the guide groove structure between the push-pull member 9 and the base 7 is not repeated; the guide groove structure between the first frame 16 and the push-pull member 9 includes a third guide groove 19 and a third sliding member 20, the third guide groove 19 is opened at the rear end of the first frame 16, the third sliding member 20 is arranged at the front end of the push-pull member 9, and the third sliding member 20 is arranged in the third guide groove 19, and the guide groove structure here is used to drive the first frame 16 to move; the guide groove structure between the second connecting rod 14 and the second frame 8 includes The second guide groove 21 and the second sliding member 22 are included. The second guide groove 21 is opened on the second frame 8. The second sliding member 22 is arranged at the end of the second connecting rod 14. The second sliding member 22 is arranged in the second guide groove 21, so that when the state of the footrest device is switched, the second connecting rod 14 can adaptively move relative to the second frame 8, thereby realizing smooth movement; taking the third frame 12 and the first connecting rod 13 as an example, the guide groove structure is configured so that when the third frame 12 moves, the first connecting rod 13 can be driven to rotate and move relative to the third frame 12 through the guide groove structure; when the state is switched, the first sliding member 18, the third sliding member 20 and the second sliding member 22 will move back and forth in the first guide groove 17, the third guide groove 19 and the second guide groove 21 accordingly.

[0048] To further illustrate, the driving structure includes a first connecting rod, a second connecting rod, a first guide groove structure, a second guide groove structure, and the driven structure includes a third guide groove structure.

[0049] To be more specific, the first connecting rod 13 is roughly T-shaped and has three ends, which are respectively used to rotatably connect the third frame 12, the second frame 8 and the push-pull member 9. The two swing connecting rods between the second frame 8 and the push-pull member 9 are the first connecting rod 13 and the third connecting rod 15; the second connecting rod 14 is roughly U-shaped, and its two ends are connected to the third frame 12 and the second frame 8, and its middle part is rotatably connected to the first connecting rod 13. When the third frame 12 moves through the first connecting rod 13 and the second connecting rod 14, the second frame 8 and the push-pull member 9 are linked without interference, and then the first frame 16 is linked.

Claims

1. A footrest device, characterized in that: It includes a first supporting part, a second supporting part and a third supporting part, which are connected in sequence; a first supporting surface is formed on the first supporting part, a second supporting surface is formed on the second supporting part, and a third supporting surface is formed on the third supporting part; the footrest device has a folded state and a flat state, in which the first supporting surface, the second supporting surface and the third supporting surface are in the same plane and together constitute a complete footrest supporting surface; in the folded state, the first supporting surface, the second supporting surface and the third supporting surface are stacked up and down.

2. The footrest device according to claim 1, characterized in that: In the folded state, the first supporting part, the second supporting part and the third supporting part are stacked in sequence from bottom to top; in the flattened state, the first supporting part, the second supporting part and the third supporting part are arranged in sequence from front to back.

3. The footrest device according to claim 2, characterized in that: When switching from the folded state to the flat state, the first supporting part flips forward from below the second supporting part, and the third supporting part flips backward from above the second supporting part, and the first supporting part and the third supporting part rotate clockwise or counterclockwise at the same time.

4. The footrest device according to claim 2, characterized in that: The length of the footrest device in the flat state is greater than the length in the folded state.

5. The footrest device according to claim 1, characterized in that: In the flat state, the first supporting surface, the second supporting surface and the third supporting surface are all facing upwards; In the folded state, the first supporting surface and the third supporting surface both face downward, and the second supporting surface faces upward.

6. The footrest device according to claim 1, characterized in that: The first supporting part includes a first frame, the second supporting part includes a second frame, and the third supporting part includes a third frame. Sponge cushions are arranged on the first frame, the second frame and the third frame.

7. The footrest device according to claim 1, characterized in that: The first supporting part includes a first frame, the second supporting part includes a second frame, and the third supporting part includes a third frame. Mesh cloths are stretched on the first frame, the second frame and the third frame.

8. The footrest device according to claim 1, characterized in that: The first supporting part and the third supporting part are both flipped and arranged on the second supporting part; a driving structure is provided between the second supporting part and the third supporting part, a driven structure is provided between the second supporting part and the first supporting part, and a push-pull member is provided between the driving structure and the driven structure. The driving structure, the driven structure and the push-pull member are configured so that when the third supporting part is flipped relative to the second supporting part, the first supporting part is flipped relative to the second supporting part under the action of the driving structure, the push-pull member and the driven structure.

9. The footrest device according to claim 8, characterized in that: The driving structure includes a first connecting rod, a second connecting rod, a first guide groove structure arranged between the first connecting rod and the third supporting part, and a second guide groove structure arranged between the second connecting rod and the second supporting part; the driven structure includes a third guide groove structure arranged between the push-pull member and the first supporting part; the first connecting rod is rotatably connected to the first folding plate, the second connecting rod and the push-pull member respectively, and the second connecting rod is rotatably connected to the second folding plate; the end of the first supporting part is rotatably connected to the end of the second supporting part; and a third connecting rod is also provided between the second supporting part and the push-pull member.

10. The footrest device according to claim 9, characterized in that: The first guide groove structure includes a first guide groove and a first sliding member, the first guide groove is opened on the third supporting part, the first sliding member is arranged on the first connecting rod, and the first sliding member is arranged in the first guide groove; the second guide groove structure includes a second guide groove and a second sliding member, the second guide groove is opened on the third supporting part, the second sliding member is arranged on the second connecting rod, and the second sliding member is arranged in the second guide groove; the third guide groove structure includes a third guide groove and a third sliding member, the third guide groove is opened on the first supporting part, the third sliding member is arranged on the push-pull member, and the third sliding member is arranged in the third guide groove.

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