CN213472893U

CN213472893U - Leg support device and seat

Info

Publication number: CN213472893U
Application number: CN202022806778.5U
Authority: CN
Inventors: 黄浩
Original assignee: Beijing CHJ Automobile Technology Co Ltd
Current assignee: Beijing CHJ Automobile Technology Co Ltd
Priority date: 2020-11-26
Filing date: 2020-11-26
Publication date: 2021-06-18
Anticipated expiration: 2030-11-26

Abstract

The utility model relates to a leg holds in palm device and seat, this leg holds in palm device includes leg support box subassembly and ventilation assembly, leg support box subassembly is provided with the bearing surface who is used for supporting passenger's shank, the ventilation hole that sets up a plurality of intervals on the bearing surface, the ventilation assembly includes airflow dispersion spare and is fixed in the fan that leg support box subassembly, airflow dispersion spare has the air current circulation chamber, the import in air current circulation chamber and the air outlet intercommunication of fan, be provided with a plurality of air current dispersion exports on the lateral wall in air current circulation chamber, airflow dispersion export and ventilation hole intercommunication, blow off from bearing surface with the air current water conservancy diversion that the fan blew off to every ventilation hole. Through setting up the air current of air current dispersion spare in to the fan guide and dispersion for each ventilation hole homoenergetic that sets up on the supporting surface can blow off even air current, thereby makes each part homoenergetic of passenger's shank feel even air current, has promoted passenger's travelling comfort and has felt.

Description

Leg support device and seat

Technical Field

The disclosure relates to the technical field of automobile seats, in particular to a leg support device and a seat.

Background

With the rapid development of the automobile electronic industry, the automobile comfort system tends to be automated and intelligent, all of which are due to the increasingly high requirements of users on the comfort of automobile riding. Some seats of automobiles are provided with leg supports for supporting legs of passengers, but the leg supports have single function and cannot provide more comfortable riding experience for the passengers.

SUMMERY OF THE UTILITY MODEL

The leg support device not only can support the legs of passengers, but also has a ventilation function, so that the comfort level of the passengers in the seats is improved.

In order to achieve the above object, the present disclosure provides a leg rest device and a seat having the same, where the leg rest device includes a leg rest support box assembly and a ventilation assembly, the leg rest support box assembly is provided with a support surface for supporting legs of a passenger, the support surface is provided with a plurality of ventilation holes arranged at intervals, the ventilation assembly includes an airflow dispersion assembly and a fan fixed to the leg rest support box assembly, the airflow dispersion assembly has an airflow circulation cavity, an inlet of the airflow circulation cavity is communicated with an air outlet of the fan, a plurality of airflow dispersion outlets are provided on a side wall of the airflow circulation cavity, and the airflow dispersion outlets are communicated with the ventilation holes to guide airflow of the fan to each ventilation hole, so as to blow out the airflow from the support surface.

Optionally, the leg rest support box assembly comprises a leg rest support box and a support box cover covering an opening of the leg rest support box, the fan is fixed in the leg rest support box, a through groove is formed in the leg rest support box, one end of the airflow dispersion member is connected with the fan, the other end of the airflow dispersion member penetrates through the through groove, and the support surface and the outer surface of the leg rest support box are arranged oppositely.

Optionally, the air current dispersion piece is including constructing into first water conservancy diversion section and the second water conservancy diversion section of L type structure, first water conservancy diversion section is located the leg holds in the palm the support box in, the second water conservancy diversion section is located outside the leg holds in the palm the support box, the second water conservancy diversion section structure be platelike structure and with supporting surface parallel arrangement, the air current dispersion export is seted up in the second water conservancy diversion section, the air current dispersion export with the ventilation hole one-to-one.

Optionally, the leg rest supporting box assembly includes a leg rest supporting box and an elastic supporting member for supporting the legs of the passenger, the elastic supporting member is fixed to the outer wall of the leg rest supporting box, the supporting surface is one side of the elastic supporting member departing from the leg rest supporting box, and the ventilation hole penetrates through the elastic supporting member.

Optionally, the leg rest device further comprises a heating assembly, the heating assembly comprises a heating pad for heating the elastic support member, the heating pad is arranged on the surface of the elastic support member and/or in the elastic support member, and the heating pad is provided with an airflow through hole corresponding to the ventilation hole.

Optionally, the leg rest further comprises a controller and a first sensor for detecting the temperature of the support surface, the controller is electrically connected to the first sensor, the heating pad and the fan respectively, so as to adjust the rotation speed of the fan and the current of the heating pad according to the temperature acquired by the first sensor, thereby keeping the temperature of the support surface within a temperature threshold.

Optionally, the leg support device further comprises a leg support telescopic mechanism, one end of the leg support telescopic mechanism is used for being fixed on the seat framework, and the other end of the leg support telescopic mechanism is fixed with the leg support box assembly so as to drive the leg support box assembly to stretch and adjust the angle.

Optionally, the leg rest telescoping mechanism includes a drive assembly and a planar linkage, the planar linkage being telescopically connected to the seat frame and the leg rest support box assembly, the drive assembly being configured to drive the planar linkage to move so that the leg rest support box assembly telescopes and adjusts the angle.

Optionally, the leg rest device further comprises a controller and a second sensor for sensing a distance between the leg rest support box assembly and a vehicle bottom, an instrument panel or an adjacent seat, and the controller is electrically connected with the second sensor and the leg rest telescoping mechanism respectively, so that when the distance acquired by the second sensor is smaller than a distance threshold value, the leg rest telescoping mechanism is activated to enable the leg rest support box assembly to extend or retract adaptively to increase the distance.

According to another aspect of the present disclosure, a seat is further provided, which includes a seat frame and the leg rest device, wherein the leg rest device is disposed on the seat frame.

The technical scheme can at least achieve the following technical effects:

the airflow blown out from the fan enters the airflow circulation cavity of the airflow dispersion member, and is guided and dispersed by the airflow circulation cavity, and is blown out from the plurality of ventilation holes arranged on the supporting surface through the airflow dispersion outlets on the side wall of the airflow circulation cavity, so that the legs of passengers can feel the blowing of the airflow, the leg support device has a ventilation function, and the comfort level of the leg support device is improved. Through setting up the air current of air current dispersion spare in to the fan guide and dispersion for each ventilation hole homoenergetic that sets up on the supporting surface can blow off even air current, thereby makes each part homoenergetic of passenger's shank feel even air current, has further promoted passenger's travelling comfort and has felt.

Additional features and advantages of the disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:

FIG. 1 is a schematic perspective view of a leg rest according to an embodiment of the present disclosure;

FIG. 2 is a schematic perspective view of a support box lid of a leg rest apparatus according to an embodiment of the present disclosure;

FIG. 3 is a schematic perspective view of a fan and an airflow splitter according to an embodiment of the present disclosure;

FIG. 4 is a schematic perspective view of a leg rest support box of a leg rest apparatus according to an embodiment of the present disclosure;

FIG. 5 is a schematic perspective view of a leg rest telescoping mechanism of a leg rest apparatus according to an embodiment of the present disclosure;

fig. 6 is a control schematic diagram of a leg rest device according to an embodiment of the present disclosure.

Description of the reference numerals

100-a leg rest device; 10-a leg rest support box assembly; 11-a leg rest support box; 12-supporting the box cover; 121-a through groove; 13-a resilient support; 131-a vent; 132-a support surface; 14-an opening; 21-a fan; 22-an airflow dispersion member; 221-a first flow guide section; 222-a second flow guide section; 30-a heating pad; 31-airflow through holes; 40-leg support telescoping mechanism; 41-a drive assembly; 42-planar linkage; 81-a controller; 82-a first sensor; 83-second sensor.

Detailed Description

The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

In the present disclosure, unless otherwise specified, the terms of orientation such as "up, down, front, and rear" are generally used to mean "up, down, front, and rear" in a state where the leg rest device 100 is mounted on the vehicle, and are aligned with the directions of "up, down, front, and rear" in a normal running of the vehicle, and "inside and outside" mean inside and outside of the contour of the relevant component. In addition, the terms "first", "second", and the like used in the embodiments of the present disclosure are for distinguishing one element from another, and have no order or importance.

To increase the comfort of a passenger when seated in the seat, in the present disclosure, a legrest 100 is provided, as shown in fig. 1-6, the legrest 100 including a legrest support box assembly 10 and a ventilation assembly. The legrest support box assembly 10 is provided with a support surface 132 for supporting the legs of an occupant. The legs contact the support surface 132 when the occupant is seated in the seat. The supporting surface 132 is provided with a plurality of ventilation holes 131 arranged at intervals. The ventilation assembly includes an airflow dispersion member 22 and a fan 21 secured to the leg rest support box assembly 10. The airflow dispersion member 22 has an airflow circulation chamber (not shown) whose inlet communicates with the air outlet of the fan 21, and a plurality of airflow dispersion outlets (not shown) provided on a side wall of the airflow circulation chamber and communicating with the vent holes 131 to guide the airflow blown by the fan to each of the vent holes 131 to be blown out from the support surface 132.

In the above-described technical solution, the airflow blown out by the fan 21 enters the airflow circulation chamber of the airflow dispersion member 22, and is guided and dispersed by the airflow circulation chamber, and is blown out from the plurality of vent holes 131 provided in the support surface 132 through the respective airflow dispersion outlets on the side wall of the airflow circulation chamber, so that the legs of the passenger can feel the blowing of the airflow, the leg rest device 100 has a ventilation function, and the comfort of the leg rest device 100 is improved. The airflow in the fan 21 is guided and dispersed by the airflow dispersing member 22, so that each vent hole 131 provided on the support surface 132 can blow out a uniform airflow, each part of the leg of the passenger can feel a uniform airflow, and the comfort of the passenger is further improved.

Without limitation in the present disclosure as to how the fan 21 is fixed, in one embodiment of the present disclosure, as shown in fig. 2 to 4, the leg rest support box assembly 10 includes a leg rest support box 11 and a support box cover 12 covering an opening 14 of the leg rest support box 11. The fan 21 is fixed in the leg support supporting box 11, the leg support supporting box 11 is provided with a through groove 121, one end of the airflow dispersing piece 22 is connected with the fan 21, the other end of the airflow dispersing piece passes through the through groove 121, airflow dispersing outlets are distributed on the outer surface of the leg support supporting box 11, and the supporting surface 132 is arranged opposite to the outer surface of the leg support supporting box 11.

The fan 21 is arranged in the accommodating cavity of the leg rest support box 11, and the opening 14 of the leg rest support box 11 is sealed by the leg rest support box 11, so that the fan 21 is arranged in the relatively sealed accommodating cavity, not only can noise possibly generated by the fan 21 be sealed, but also the flow of air flow generated by the fan 21 can be limited, and only the air flow is allowed to flow into the air flow cavity of the air flow dispersing piece 22 from the air outlet of the fan 21, so that the air flow generated by the fan 21 can be supplied to the support surface 132 for blowing the legs of passengers, and the utilization rate of the air flow supplied by the fan 21 is improved.

It will be appreciated that in other embodiments, the fan 21 may be fixed directly to the outer wall of the leg rest support box 11.

The specific shape or structure of the airflow dispersion member 22 is not limited in the present disclosure as long as the airflow dispersion member 22 can guide the airflow at the outlet of the fan 21 to the vent holes 131 of the support surface 132. In one embodiment, as shown in fig. 3, the airflow dispersion member 22 includes a first guide section 221 and a second guide section 222 configured in an L-shaped configuration. The first flow guiding section 221 is located inside the leg rest support box 11, and the second flow guiding section 222 is located outside the leg rest support box 11. The leg rest support box assembly 10 includes a leg rest support box 11 and a support box cover 12 covering an opening 14 of the leg rest support box 11. The elastic support 13 is fixed to the outer wall of the leg rest support box 11, and the support surface 132 is a side of the elastic support 13 facing away from the leg rest support box 11. The second guide section 222 is configured as a plate-shaped structure and is disposed in parallel with the support surface 132, the airflow dispersion outlet is opened to the second guide section 222, the second guide section 222 is configured to cover all the vent holes 131 so as to supply the airflow to each vent hole 131, and the airflow dispersion outlet and the vent holes 131 correspond one to one.

The airflow of the fan 21 enclosed in the leg rest support box 11 can be guided to the outside of the leg rest support box 11 by the airflow dispersion member 22 configured in the L-shaped structure, and moreover, the second guide section 222 arranged in parallel with the support surface 132 can cover all the vent holes 131 on the support surface 132, so that the airflow in the airflow dispersion member 22 can be uniformly and rapidly blown out through each vent hole 131.

Optionally, the fan 21 is further covered with an airflow guiding casing, and the airflow guiding casing is covered on the outlet surface of the fan 21 and has an air outlet communicated with the first flow guiding section 221.

In one embodiment, the airflow dispersion member 22 may be made of a textile material having a certain stiffness. The airflow dispersion outlet is constructed as an air vent which the textile material itself has.

In order to elastically support the legs of the passenger, as shown in fig. 1, the leg rest support box assembly 10 further includes an elastic support member 13 for supporting the legs of the passenger, the elastic support member 13 is fixed to an outer wall of the leg rest support box 11, and the elastic support member 13 is fixed to a side of the leg rest support box 11 facing the front of the vehicle, taking the seat facing forward as an example. Optionally, the elastic support 13 covers the side of the support box cover 12 facing away from the leg rest support box 11. Alternatively, the support surface 132 is a side of the elastic support 13 facing away from the leg rest support box 11, and the ventilation hole 131 penetrates through the elastic support 13. The support surface 132 is a surface of the elastic support 13 that comes into contact with the leg of the passenger.

When the vehicle runs and bumps, the elastic supporting piece 13 is arranged on the leg support device 100, so that the collision between the leg and the leg support can be buffered through the deformation of the elastic supporting piece 13, and the riding comfort of passengers is improved.

The material of the elastic support member 13 is not limited in the present disclosure as long as it has certain elasticity to buffer the impact, and in one embodiment, the elastic support member 13 includes a foam material and a textile material coated on the foam material.

In order to further increase the functions of the leg rest device 100, in an embodiment of the present disclosure, as shown in fig. 1, the leg rest device 100 further includes a heating assembly, the heating assembly includes a heating pad 30 for heating the elastic support member 13, the heating pad 30 is disposed on the surface of the elastic support member 13 and/or in the elastic support member 13, and the heating pad 30 is opened with an airflow through hole 31 corresponding to the ventilation hole 131.

Therefore, the elastic support 13 for supporting the legs of the passenger can be heated by providing the heating unit, and at the same time, the airflow is blown out from the elastic support 13, and therefore, the airflow is also heated so that a warm airflow is blown out from the elastic support 13, and thus, when the ambient temperature is low, the legs of the passenger can be heated. Alternatively, the elastic support 13 is heated only by the heating assembly, in which case the fan for ventilation may be switched off.

Optionally, a heating resistance wire is provided in the heating pad 30, so that the heating pad 30 is heated by resistance-powered heating, and then the heating pad 30 heats the elastic support 13.

To further increase the functionality of the legrest 100 and to further enhance the comfort of the occupant, the legrest 100 further comprises a controller 81 and a first sensor 82 for detecting the temperature of the support surface 132. The controller 81 is electrically connected to the first sensor 82, the heating mat 30 and the fan 21, respectively, to adjust the rotation speed of the fan 21 and the magnitude of the current of the heating mat 30 according to the temperature acquired by the first sensor 82, thereby maintaining the temperature of the support surface 132 within a temperature threshold. Alternatively, the first sensor 82 may be a temperature sensor.

The specific value of the temperature threshold can be set according to the temperature range in which the human body feels comfortable, for example, 18-25 ℃. When the first sensor 82 detects that the temperature is greater than the temperature threshold value, controlling the fan 21 to start or controlling the started fan 21 to increase the rotating speed so as to reduce the temperature; similarly, when the first sensor 82 detects a temperature less than the temperature threshold, the fan 21 is controlled to turn off or the activated fan 21 is controlled to reduce the rotation speed, and the current level in the heating mat 30 is activated and/or increased to increase the temperature. Therefore, by providing the first sensor 82 and the controller 81, the fan 21 and the heating power can be cooperatively controlled according to the magnitude of the temperature, so that the temperature of the leg rest apparatus 100 can be always kept within the temperature threshold at which a person feels comfortable.

In order to support the legs of the passengers in different postures, as shown in fig. 1 and 5, the leg rest device 100 further comprises a leg rest telescoping mechanism 40, one end of the leg rest telescoping mechanism 40 is used for being fixed on the seat frame, and the other end of the leg rest telescoping mechanism 40 is fixed with a leg rest support box assembly 10 to drive the leg rest support box assembly 10 to telescope and adjust the angle thereof, so that the leg rest support box assembly 10 is close to or far away from the seat frame, and the angle of the leg rest support box assembly 10 is adjusted, therefore, the legs of the passengers can be supported in different postures, and different sitting posture requirements of the passengers are met.

The specific structure of the leg rest telescoping mechanism 40 is not limited in this disclosure as long as the leg rest support box assembly 10 can be actuated to move closer to or away from the seat frame. In one embodiment of the present disclosure, as shown in fig. 1 and 5, the leg rest telescoping mechanism 40 includes a drive assembly 41 and a planar linkage 42, the planar linkage 42 being telescopically connected to the seat frame and the leg rest support box assembly 10, the drive assembly 41 being used to drive the planar linkage 42 to move to telescope the leg rest support box assembly 10 and adjust the angle thereof. One end of the plane link mechanism 42, which is far away from the seat frame, is connected to the bottom of the leg rest support box 11, and one end of the plane link mechanism 42, which is close to the seat frame, is fixed to the seat frame. Drive the leg through setting up plane link mechanism 42 and hold in the palm flexible, can accomplish flexible process comparatively steadily, in addition flexible, the rotation through connecting rod among the plane link mechanism 42 can drive leg and hold in the palm support box subassembly 10 angle regulation, and passenger's use is experienced betterly.

Optionally, the driving assembly 41 includes a motor, a screw rod and a screw nut, the motor is in transmission connection with the screw rod to drive the screw rod to rotate, and the screw nut is in threaded fit with the screw rod and is connected to the connecting rod. When the motor rotates, the screw rod is driven to rotate, so that the screw rod nut moves back and forth along the screw rod, and the plane connecting rod mechanism 42 is driven to stretch.

In order to make the extension and retraction of the leg rest support box assembly 10 more stable, in one embodiment of the present disclosure, the leg rest device 100 is provided with two sets of planar linkages 42, and the two sets of planar linkages 42 are connected at intervals at the bottom of the leg rest support box 11.

In other embodiments, the leg rest telescoping mechanism 40 may also be a scissor-type linkage structure, and a motor drives one of the linkages of the scissor-type linkage structure to rotate, so as to drive the leg rest support box assembly 10 to telescope.

In one embodiment of the present disclosure, the legrest device 100 further includes a controller 81 and a second sensor 83 for sensing the distance of the legrest support box assembly 10 from the bottom of the vehicle, the dashboard, or an adjacent seat. As shown in fig. 6, the controller 81 is electrically connected to the second sensor 83 and the leg rest telescoping mechanism 40 respectively, so that when the second sensor 83 detects that the distance is less than the distance threshold, the leg rest telescoping mechanism 40 is activated to cause the leg rest support box assembly 10 to adaptively extend or retract to increase the distance. The peripheral distance includes the distance from the leg rest support box 11 to the instrument panel in front and the distance from the bottom of the vehicle.

When the passenger adjusts the front-rear position of the seat or adjusts the angle of the backrest, if the position of the leg rest support box 11 is not proper, the passenger may be caught.

Since the second sensor 83 is provided, the second sensor 83 is provided on the leg rest support box 11, and alternatively, the second sensor 83 may be a distance sensor, and the second sensor 83 may be provided on both the surface of the front side of the leg rest support box 11 and the bottom thereof, so as to detect the distance between the leg rest support box 11 and the instrument panel in front of the vehicle or the adjacent seat, the bottom of the vehicle. When the seat is disposed in the front row, the distance from the instrument panel and the bottom of the vehicle is detected. When the seat is disposed in the middle row or the rear row, the distance from the adjacent seat and the bottom of the vehicle is detected. When the controller 81 acquires that the distance is less than the distance threshold value through the second sensor 83, the controller controls the leg-rest support box assembly 10 to adaptively extend or retract so that the leg-rest support box assembly 10 is away from the bottom of the vehicle or away from the instrument panel of the vehicle, thereby avoiding the risk of the passenger's leg being pinched. Therefore, the leg rest device 100 in the present disclosure has a function of sensing the position of the seat and the angle of the backrest and performing adaptive adjustment based on the space around the leg rest.

As an embodiment, the controller 81 may be an integrated circuit chip having signal Processing capability, and the controller 81 may be a general-purpose Processor including a Central Processing Unit (CPU), a Network Processor (NP), and the like; but may also be a digital signal processor, an application specific integrated circuit, a field programmable gate array, a programmable logic controller 81 or other programmable logic device, discrete gate or transistor logic, discrete hardware components.

According to an aspect of the present disclosure, there is also provided a seat comprising a seat frame and the above-mentioned leg rest device 100, wherein the leg rest device 100 is disposed on the seat frame for supporting a leg portion of an occupant.

The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims

1. The leg support device is characterized by comprising a leg support box assembly (10) and a ventilation assembly, wherein the leg support box assembly (10) is provided with a supporting surface (132) for supporting legs of a passenger, the supporting surface (132) is provided with a plurality of ventilation holes (131) arranged at intervals, the ventilation assembly comprises an airflow dispersion assembly (22) and a fan (21) fixed on the leg support box assembly (10), the airflow dispersion assembly (22) is provided with an airflow circulation cavity, an inlet of the airflow circulation cavity is communicated with an air outlet of the fan (21), a plurality of airflow dispersion outlets are arranged on the side wall of the airflow circulation cavity, and the airflow dispersion outlets are communicated with the ventilation holes (131) so as to guide airflow of the fan (21) to each ventilation hole (131) to blow out from the supporting surface (132).

2. The leg rest device according to claim 1, wherein the leg rest support box assembly (10) comprises a leg rest support box (11) and a support box cover (12) covering an opening (14) of the leg rest support box (11), the fan (21) is fixed in the leg rest support box (11), a through groove (121) is formed in the leg rest support box (11), one end of the airflow dispersion member (22) is connected with the fan (21), the other end of the airflow dispersion member penetrates through the through groove (121), and the support surface (132) is arranged opposite to the outer surface of the leg rest support box (11).

3. The legrest device according to claim 2, wherein the airflow dispersion member (22) comprises a first flow guide section (221) and a second flow guide section (222) configured into an L-shaped structure, the first flow guide section (221) is located inside the legrest support box (11), the second flow guide section (222) is located outside the legrest support box (11), the second flow guide section (222) is configured into a plate-shaped structure and is arranged in parallel with the support surface (132), the airflow dispersion outlet is opened in the second flow guide section (222), and the airflow dispersion outlet is in one-to-one correspondence with the ventilation holes (131).

4. A legrest arrangement according to any of claims 1-3, characterised in that the legrest support box assembly (10) comprises a legrest support box (11) and a resilient support (13) for supporting the legs of the occupant, the resilient support (13) being secured to an outer wall of the legrest support box (11), the support surface (132) being the side of the resilient support (13) facing away from the legrest support box (11), the ventilation hole (131) extending through the resilient support (13).

5. The leg rest device according to claim 4, characterized in that the leg rest device (100) further comprises a heating assembly, the heating assembly comprises a heating pad (30) for heating the elastic support member (13), the heating pad (30) is arranged on the surface of the elastic support member (13) and/or in the elastic support member (13), and the heating pad (30) is provided with air flow through holes (31) corresponding to the ventilation holes (131).

6. The leg rest according to claim 5, characterized in that the leg rest (100) further comprises a controller (81) and a first sensor (82) for detecting the temperature of the support surface (132), the controller (81) being electrically connected to the first sensor (82), the heating pad (30) and the fan (21), respectively, for adjusting the rotation speed of the fan (21) and the magnitude of the current of the heating pad (30) according to the temperature acquired by the first sensor (82) so as to keep the temperature of the support surface (132) within a temperature threshold.

7. The leg rest device according to any one of claims 1 to 3, wherein the leg rest device (100) further comprises a leg rest telescoping mechanism (40), one end of the leg rest telescoping mechanism (40) is used for being fixed on a seat frame, and the other end of the leg rest telescoping mechanism (40) is fixed with the leg rest support box assembly (10) so as to drive the leg rest support box assembly (10) to telescope and adjust the angle.

8. The legrest device of claim 7, wherein the legrest telescoping mechanism (40) comprises a drive assembly (41) and a planar linkage (42), the planar linkage (42) being telescopically connected to the seat frame and the legrest support box assembly (10), the drive assembly (41) being configured to drive the planar linkage (42) to move to telescope and adjust the angle of the legrest support box assembly (10).

9. The legrest device according to claim 7, wherein the legrest device (100) further comprises a controller (81) and a second sensor (83) for sensing a distance between the legrest support box assembly (10) and a vehicle bottom, dashboard or adjacent seat, the controller (81) being electrically connected to the second sensor (83) and the legrest telescoping mechanism (40), respectively, to activate the legrest telescoping mechanism (40) to cause the legrest support box assembly (10) to adaptively extend or retract to increase the distance when the second sensor (83) senses that the distance is less than a distance threshold.

10. A seat comprising a seat frame and a leg rest (100) as claimed in any one of claims 1 to 9, the leg rest (100) being provided on the seat frame.