Seat

Abstract

The invention provides a seat. The seat comprises a main footrest mechanism and an auxiliary footrest mechanism, the main footrest mechanism comprises a main footrest assembly and a main footrest pad, and the auxiliary footrest mechanism comprises an auxiliary footrest assembly and an auxiliary footrest pad. The main footrest pad is installed on the top of the main footrest assembly, and the auxiliary footrest pad is installed on the top of the auxiliary footrest assembly. The horizontal plane where the highest point of the main footrest mechanism is located is a first plane, and the horizontal plane where the highest point of the auxiliary footrest mechanism is located is a second plane. When the seat is in the TV posture state, the first plane is located below the second plane. When the seat is in the TV posture state, the first plane is located below the second plane, and the descending height of the first plane relative to the second plane can be used for placing a heel, so that the heel is prevented from driving a shank to bend upwards, and the sitting comfort of a user is improved.

Description

Technical Field

[0001] This application relates to the technical field of furniture, and particularly to a seating furniture. Background Art

[0002] In the field of sofa furniture, adjustable footrest structures have been widely used in the design of functional sofas, and most of them achieve the height adjustment function of the large footrest and the small footrest through link mechanisms. However, existing designs mostly focus on the optimization of the link structure and lack consideration of the application scenarios where a soft padding layer must be wrapped in actual use.

[0003] Due to the certain arc difference between the heel and the calf of the human body, and sometimes users lie on the sofa wearing shoes. In such cases, when the soft padding layer is wrapped, the small footrest part in the adjustable footrest structure will be higher than the large footrest part, resulting in a bend between the heel and the calf and affecting the sitting comfort of the user.

[0004] Therefore, it is necessary to design a seating furniture that solves the above technical problems. Summary of the Invention

[0005] This application provides a seating furniture that can improve the sitting comfort of users.

[0006] According to an embodiment of this specification, a seating furniture is provided, which includes a main footrest mechanism and a secondary footrest mechanism. The main footrest mechanism includes a main footrest assembly and a main footrest pad, and the secondary footrest mechanism includes a secondary footrest assembly and a secondary footrest pad; the main footrest pad is installed on the top of the main footrest assembly, and the secondary footrest pad is installed on the top of the secondary footrest assembly;

[0007] Wherein, the horizontal plane where the highest point of the main footrest mechanism is located is the first plane, and the horizontal plane where the highest point of the secondary footrest mechanism is located is the second plane; when the seating furniture is in the TV position state, the first plane is located below the second plane.

[0008] Further, the horizontal plane where the highest point of the main footrest assembly is located is the third plane, the horizontal plane where the highest point of the secondary footrest assembly is located is the fourth plane, the horizontal plane where the highest point of the main footrest pad is located is the fifth plane, and the horizontal plane where the highest point of the secondary footrest pad is located is the sixth plane; when the seating furniture is in the TV position state, the third plane is located below the fourth plane, and the fifth plane is located below the sixth plane.

[0009] Further, the horizontal plane where the highest point of the main footrest assembly is located is the third plane, the horizontal plane where the highest point of the secondary footrest assembly is located is the fourth plane, the horizontal plane where the highest point of the main footrest pad is located is the fifth plane, and the horizontal plane where the highest point of the secondary footrest pad is located is the sixth plane; when the seating furniture is in the TV position state, the third plane is located above the fourth plane, and the fifth plane is located below the sixth plane.

[0010] Further, it further includes a footrest extension assembly; the main footrest assembly includes a main support plate, a linkage rod, and an extension link; one end of the main support plate is used to support the user's foot; the other end is connected to one end of the extension link; both ends of the linkage rod are respectively connected to the main support plate and the secondary footrest assembly, and the other end of the extension link is connected to the footrest extension assembly.

[0011] Further, the linkage rod includes a first linkage portion connected to the main support plate and a second linkage portion connected to the secondary footrest assembly, and an obtuse angle is formed between the first linkage portion and the second linkage portion.

[0012] Further, when the seat is in the TV position state, along the first direction, the first linkage portion extends away from the secondary footrest assembly, and the angle between the first linkage portion and the horizontal plane is a, and the range of a is 10° - 15°.

[0013] Further, the angle between the first linkage portion and the second linkage portion is b, and the range of b is 155° - 165°;

[0014] The length of the first linkage portion is greater than the length of the second linkage portion.

[0015] Further, when the seat is in the TV position state, along the first direction, the first linkage portion extends away from the secondary footrest assembly, and the angle between the first linkage portion and the horizontal plane is c, and the range of c is 25° - 35°.

[0016] Further, the angle between the first linkage portion and the second linkage portion is d, and the range of d is 100° - 110°;

[0017] The length of the first linkage portion is greater than the length of the second linkage portion.

[0018] Further, the main support plate includes a first support portion and a second support portion, and the connection point between the first support portion and the second support portion is connected to the linkage rod; an obtuse angle is formed between the first support portion and the second support portion.

[0019] Further, the secondary footrest assembly includes a secondary support plate and a secondary footrest link; both ends of the secondary footrest link are respectively connected to the secondary support plate and the extension link and are disposed therebetween.

[0020] Further, the footrest extension assembly includes a first link, a second link, a third link, and a fourth link. Two ends of the first link are respectively connected to the secondary support plate and the second link. One end of the third link is connected to the extension link and the secondary support plate, and the other end of the third link is connected to the fourth link. The middle of the first link is connected to the fourth link.

[0021] Further, the third link is bent toward one side of the first link; the third link and the first link partially overlap.

[0022] Further, a drive assembly is further included. The drive assembly includes a drive member, a first extension link, and a second extension link. Two ends of the first extension link are respectively connected to the drive member and the second extension link, and the second extension link is connected to the middle of the fourth link.

[0023] Further, a base, a suspension assembly, a seat frame assembly, and a backrest assembly are further included. The suspension assembly is respectively connected to the base and the seat frame assembly, and the backrest assembly and the footrest extension assembly are respectively connected to the front and rear ends of the seat frame assembly.

[0024] Further, when the seat is in a reclined state, an angle e is formed between the main footrest pad and the horizontal plane, and the degree range of the angle e is 5° - 20°. An angle f is formed between the secondary footrest pad and the horizontal plane, and the degree range of the angle f is 7° - 23°. The angle e is less than the angle f.

[0025] The present application has the following beneficial effects: When the seat of the present application is in the TV position, the first plane is below the second plane, and the height by which the first plane descends compared to the second plane can be used to place the heel of the shoe, thereby avoiding the heel driving the calf to bend upward and improving the comfort of the user when sitting.

[0026] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit this specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings herein are incorporated into the specification and form a part of the specification, showing embodiments consistent with the specification, and are used together with the specification to explain the principles of the specification.

[0028] Figure 1 is a schematic structural diagram of a seat in a sitting state according to an embodiment of the present application;

[0029] Figure 2 is a schematic structural diagram of a seat in the TV position according to an embodiment of the present application;

[0030] Figure 3It is a schematic structural diagram of a seating device in a lying position according to an embodiment of the present application;

[0031] Figure 4 It is a schematic structural diagram of a linkage rod according to an embodiment of the present application;

[0032] Figure 5 It is a schematic structural diagram of a seating device in a sitting position according to another embodiment of the present application;

[0033] Figure 6 It is a schematic structural diagram of a seating device in a TV position according to another embodiment of the present application;

[0034] Figure 7 It is a schematic structural diagram of a seating device in a lying position according to another embodiment of the present application;

[0035] Figure 8 It is a schematic structural diagram of a linkage rod according to another embodiment of the present application.

[0036] Explanation of reference numerals:

[0037] 10 - Main footrest assembly; 11 - Main support plate; 111 - First support portion; 112 - Second support portion; 12 - Linkage rod; 121 - First linkage portion; 122 - Second linkage portion; 13 - Extension link; 131 - Support block;

[0038] 20 - Main footrest pad;

[0039] 30 - Sub - footrest assembly; 31 - Sub - support plate; 32 - Sub - footrest link;

[0040] 40 - Sub - footrest pad;

[0041] 50 - Footrest extension assembly; 51 - First link; 52 - Second link; 53 - Third link; 54 - Fourth link;

[0042] 60 - Driving assembly; 61 - Driving member; 62 - First extension link; 63 - Second extension link;

[0043] 71 - Base; 72 - Suspension assembly; 73 - Seat frame assembly; 74 - Backrest assembly. Detailed implementation manners

[0044] Here, the technical solutions in the embodiments (or "implementation manners") of the present application will be clearly and completely described in conjunction with the accompanying drawings. When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0045] If there are terms related to directional indication or positional relationship in the embodiments of this application (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, lateral, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationship, movement situation, etc. between components in a specific posture (as shown in the attached drawings); if this specific posture changes, then the directional indication or positional relationship also changes accordingly. In addition, terms such as "first" and "second" involved in the embodiments of this application are only for the purpose of convenient description and cannot be construed as indicating or implying relative importance.

[0046] Next, the embodiments of this specification will be described in detail.

[0047] Refer to Figure 1 and Figure 5 As shown, the embodiments of this application disclose a seating device, which includes a main footrest mechanism, a secondary footrest mechanism, a footrest extension assembly 50, and a drive assembly 60. The main footrest mechanism includes a main footrest assembly 10 and a main footrest pad 20, and the secondary footrest mechanism includes a secondary footrest assembly 30 and a secondary footrest pad 40. Among them, the main footrest pad 20 is installed on the top of the main footrest assembly 10, and the secondary footrest pad 40 is installed on the top of the secondary footrest assembly 30.

[0048] The main footrest assembly 10 is rotatably connected to the secondary footrest assembly 30, the secondary footrest assembly 30 is rotatably connected to the footrest extension assembly 50, and the footrest extension assembly 50 is rotatably connected to the drive assembly 60. Thus, when the drive assembly 60 drives the footrest extension assembly 50 to unfold, while driving the secondary footrest assembly 30 to unfold, the main footrest assembly 10 also unfolds synchronously, realizing the switching of the seating posture state of the seating device. The seating device in the embodiments of this application refers to a sofa. In some cases, the seating device may also refer to a chair, a stool, etc., which are not specifically limited here.

[0049] The horizontal plane where the highest point of the main footrest mechanism is located is the first plane, and the horizontal plane where the highest point of the secondary footrest mechanism is located is the second plane. Specifically, the horizontal plane where the highest point of the main footrest assembly 10 is located is the third plane, the horizontal plane where the highest point of the secondary footrest assembly 30 is located is the fourth plane, the horizontal plane where the highest point of the main footrest pad 20 is located is the fifth plane, and the horizontal plane where the highest point of the secondary footrest pad 40 is located is the sixth plane. When the seating device is placed on the ground, the above-mentioned reference horizontal plane is the ground.

[0050] When the seating device is in the TV posture state, the first plane is located below the second plane, and the height by which the first plane descends compared to the second plane can be used to place the heel, thereby avoiding the heel driving the lower leg to bend upward and improving the comfort of the user when sitting.

[0051] In one embodiment, with reference to Figures 2 - 4As shown, when the seating furniture is in the TV position state, the third plane is located below the fourth plane, and the fifth plane is located below the sixth plane.

[0052] In another embodiment, with reference to Figures 6 - 8 As shown, when the seating furniture is in the TV position state, the third plane is located above the fourth plane, and the fifth plane is located below the sixth plane.

[0053] The main footrest assembly 10 includes a main support plate 11, a linkage rod 12, and an extension link 13. The main support plate 11 includes a first support portion 111 and a second support portion 112. The first support portion 111 extends away from the secondary footrest assembly 30, and the main footrest pad 20 is mounted on the first support portion 111. In this way, it is possible to prevent the main footrest pad 20 from interfering with the secondary footrest assembly 30 and the secondary footrest pad 40 during the switching of the seating posture of the seating furniture.

[0054] An obtuse angle is formed between the first support portion 111 and the second support portion 112, thereby lifting the first support portion 111 away from the ground, and controlling the height difference between the first plane and the second plane to facilitate raising the heels of the user placed on the main support plate 11.

[0055] The linkage rod 12 includes a first linkage portion 121 and a second linkage portion 122. The connection point between the first support portion 111 and the second support portion 112 is connected to the first linkage portion 121. The second linkage portion 122 is connected to the secondary footrest assembly 30.

[0056] In one embodiment, when the seating furniture is in the TV position state, along the first direction, the first linkage portion 121 extends away from the secondary footrest assembly 30, and the angle between the first linkage portion 121 and the horizontal plane is a, and the range of a is 10° - 15°. In this way, the first linkage portion 121 is substantially parallel to the horizontal plane, reducing the height of the connection point between the first support portion 111 and the second support portion 112, and thus reducing the height of the main footrest pad 20, ensuring that when the seating furniture is in the TV position state, the third plane is located below the fourth plane.

[0057] The angle between the first linkage portion 121 and the second linkage portion 122 is b, and the range of b is 155° - 165°. And the length of the first linkage portion 121 is greater than the length of the second linkage portion 122. In this way, the main support plate 11 fixed on the first linkage portion 121 can be arranged away from the linkage rod 12, avoiding interference between their movements while meeting the distance between the heels and the calves, enabling the user to better support on the main footrest mechanism and the secondary footrest mechanism.

[0058] In another embodiment, when the seating furniture is in the TV posture state, along the first direction, the first linkage portion 121 extends toward the side away from the auxiliary footrest assembly 30, and the angle between the first linkage portion 121 and the horizontal plane is c, and the range of c is 25°-35°. In this way, the first linkage portion 121 extends toward the side away from the horizontal plane, increasing the height of the connection point between the first support portion 111 and the second support portion 112, and thus increasing the height of the auxiliary footrest assembly 30, ensuring that when the seating furniture is in the TV posture state, the third plane is located above the fourth plane.

[0059] The angle between the first linkage portion 121 and the second linkage portion 122 is d, and the range of d is 100°-110°. And the length of the first linkage portion 121 is greater than the length of the second linkage portion 122. In this way, the main support plate 11 fixed on the first linkage portion 121 can be arranged away from the linkage rod 12. While avoiding interference between their movements, it meets the distance between the heel and the calf, enabling the user to better support on the main footrest mechanism and the auxiliary footrest mechanism.

[0060] Both ends of the extension link 13 are respectively connected to the main support plate 11 and the footrest extension assembly 50. A support block 131 is provided on the extension link 13. When the first linkage portion 121 abuts against the support block 131, it can help disperse the pressure borne by the linkage rod 12 and improve the structural stability of the linkage rod 12.

[0061] The auxiliary footrest assembly 30 includes an auxiliary support plate 31 and an auxiliary footrest link 32. Both ends of the auxiliary footrest link 32 are respectively connected to the auxiliary support plate 31 and the linkage rod 12. Among them, the middle part of the extension link 13 is bent inward toward the seating furniture, and the space formed by the bending is used to accommodate the auxiliary footrest link 32, so that the auxiliary footrest link 32 is placed between the auxiliary support plate 31 and the extension link 13. The above-mentioned inner side refers to the inner side of the seating furniture.

[0062] The main footrest pad 20 is a soft package structure wrapped around the main support plate 11, and the auxiliary footrest pad 40 is a soft package structure wrapped around the auxiliary support plate 31.

[0063] At least one of high-density polyurethane foam, memory foam composite layer or sponge is filled in the above two soft packages, which can meet the comfort and dynamically realize the deformation of the main footrest pad 20 and the auxiliary footrest pad 40. The surface layer of the soft package is covered with breathable or scratch-resistant and wear-resistant leather consistent with the seating furniture.

[0064] In the lying position, an angle e is formed between the main footrest 20 and the horizontal plane, and the degree range of the angle e is 5° - 20°. An angle f is formed between the auxiliary footrest 40 and the horizontal plane, and the degree range of the angle f is 7° - 23°. The angle e is less than the angle f. The advantage of such a design is that when in the lying position, the pressure of the lower leg on the auxiliary footrest 40 is greater than the pressure of the heel on the main footrest 20, and the deformation of the angle of the auxiliary footrest 40 is greater, thus ensuring that when the seat is in the lying position, the first plane is above the second plane.

[0065] Specifically, when the seat is in the lying position, the pressure range exerted by the heel of the user on the seat on the main footrest 20 is between 5 kPa and 18 kPa, and the pressure range exerted by the lower leg on the auxiliary footrest 40 is between 12 kPa and 35 kPa.

[0066] In addition, when the seat is in the lying position, the height difference range between the horizontal plane where the highest point of the user's heel is located and the horizontal plane where the highest point of the lower leg is located is 2.5 cm - 3.1 cm, and the height difference range between the first plane and the second plane is 3 cm - 4.5 cm. The larger height difference between the first plane and the second plane can withstand the deformation caused by the pressure of the user's leg and heel to meet the height difference range between the horizontal plane where the highest point of the user's heel is located and the horizontal plane where the highest point of the lower leg is located in the sitting state.

[0067] In this embodiment, the main footrest 20 and the auxiliary footrest 40 are filled with soft packages of the same material. By increasing the filling thickness of the auxiliary footrest 40, the height difference range between the first plane and the second plane is 3 cm - 4.5 cm, thus meeting the deformation requirements. At the same time, ensure that the height difference between the first plane and the second plane can accommodate the heel to avoid the heel driving the lower leg to bend upward.

[0068] In some cases, this embodiment can also increase the filling density or the hardness of the filling object in the auxiliary footrest 40, reduce the deformation of the auxiliary footrest 40. In this way, the filling thickness of the auxiliary footrest 40 can be reduced, that is, the height difference between the first plane and the second plane is reduced, making the above height difference close to the height difference between the horizontal plane where the highest point of the user's heel is located and the horizontal plane where the highest point of the lower leg is located.

[0069] When the seating appliance is in the TV position, the pressure exerted by the user's heels on the main footrest pad 20 ranges from 8 kPa to 25 kPa, and the pressure exerted by the calves on the secondary footrest pad 40 ranges from 15 kPa to 30 kPa. At this time, the height difference between the horizontal plane where the highest point of the user's heels is located and the horizontal plane where the highest point of the calves is located ranges from 1.5 cm to 2.5 cm, and the height difference between the first plane and the second plane ranges from 1.5 cm to 2.5 cm. The advantage of this design is that when in the TV position, the pressure exerted by the user on the main footrest pad 20 and the secondary footrest pad 40 is relatively small, and thus the deformation amounts of the two are similar, avoiding the situation where the height difference between the first plane and the second plane is too large and the shoe heels cannot be well supported on the main footrest pad 20.

[0070] The footrest extension assembly 50 includes a first connecting rod 51, a second connecting rod 52, a third connecting rod 53, and a fourth connecting rod 54. The two ends of the first connecting rod 51 are respectively connected to the secondary support plate 31 and the second connecting rod 52. One end of the third connecting rod 53 is connected to the extension connecting rod 13 and the secondary support plate 31, the other end of the third connecting rod 53 is connected to the fourth connecting rod 54, and the middle of the first connecting rod 51 is connected to the fourth connecting rod 54, forming a structurally stable four-bar linkage structure.

[0071] The third connecting rod 53 is bent towards the side close to the first connecting rod 51. The third connecting rod 53 and the first connecting rod 51 partially overlap, making the overall structure of the footrest extension assembly 50 more compact. In addition, when viewed from the outside of the seating appliance, the first connecting rod 51 can play a role in shielding the third connecting rod 53, improving the appearance design of the footrest extension assembly 50 and enhancing the overall aesthetic feeling and neatness of the product.

[0072] The driving assembly 60 includes a driving member 61, a first extension connecting rod 62, and a second extension connecting rod 63. The two ends of the first extension connecting rod 62 are respectively connected to the driving member 61 and the second extension connecting rod 63, and the second extension connecting rod 63 is connected to the middle of the fourth connecting rod 54. The driving member 61 transmits force to the footrest extension assembly 50 through the first extension connecting rod 62 and the second extension connecting rod 63.

[0073] The seating appliance further includes a base 71, a suspension assembly 72, a seat frame assembly 73, and a backrest assembly 74. The suspension assembly 72 is respectively connected to the base 71 and the seat frame assembly 73, and the backrest assembly 74 and the footrest extension assembly 50 are respectively connected to the front and rear ends of the seat frame assembly 73. The second connecting rod 52 and the fourth connecting rod 54 are respectively connected to the seat frame assembly 73, and thus when the footrest extension assembly 50 is unfolded, it drives the seat frame assembly 73 to move synchronously.

[0074] When the seating appliance is in the sitting position, TV position, and lying position, the angles formed by the installation surface of the seat frame assembly 73 and the horizontal plane respectively range from 7° to 11°, 10° to 14°, and 26° to 28°.

[0075] In this embodiment, the horizontal plane where the highest point of the backrest assembly 74 is located is the seventh plane. When the seat is in the lying state, the third plane is above the seventh plane, and the shortest distance between the third plane and the seventh plane is 120 - 125 cm. At this time, the seat is in the zero-gravity state and is in the most comfortable posture.

[0076] The main footrest assembly 10 and the auxiliary footrest assembly 30 of the present application have simple structures, few parts, low production and processing costs, and can achieve heel support for users.

[0077] The connecting rods forming the main footrest assembly 10, the auxiliary footrest assembly 30, the footrest extension assembly 50 and the drive assembly 60 of the present application are provided with bending portions. On the one hand, the bending portions can make the structure more compact, and on the other hand, they help to disperse the force and avoid local stress concentration, thereby improving the stability and strength of the seat. In addition, a plurality of arc-shaped avoidance grooves are formed in the connecting rods forming the above components to achieve anti-fooling.

[0078] It should be noted that the technical solutions or technical features described in the above embodiments can be combined or supplemented with each other without conflict. The scope of protection of the present application is not limited to the precise structures described in the above embodiments and shown in the drawings; all modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the scope of protection of the present application.

Claims

1. A seat, characterized in that, It includes a main footrest mechanism and a secondary footrest mechanism. The main footrest mechanism includes a main footrest assembly and a main footrest pad, and the secondary footrest mechanism includes a secondary footrest assembly and a secondary footrest pad; The main footrest pad is installed on the top of the main footrest assembly, and the secondary footrest pad is installed on the top of the secondary footrest assembly; Wherein, the horizontal plane where the highest point of the main footrest mechanism is located is the first plane, and the horizontal plane where the highest point of the secondary footrest mechanism is located is the second plane; when the seat is in the TV posture state, the first plane is located below the second plane.

2. The seat according to claim 1, wherein, The horizontal plane where the highest point of the main footrest assembly is located is the third plane, the horizontal plane where the highest point of the secondary footrest assembly is located is the fourth plane, the horizontal plane where the highest point of the main footrest pad is located is the fifth plane, and the horizontal plane where the highest point of the secondary footrest pad is located is the sixth plane; when the seat is in the TV posture state, the third plane is located below the fourth plane, and the fifth plane is located below the sixth plane.

3. The seat according to claim 1, wherein, The horizontal plane where the highest point of the main footrest assembly is located is the third plane, the horizontal plane where the highest point of the secondary footrest assembly is located is the fourth plane, the horizontal plane where the highest point of the main footrest pad is located is the fifth plane, and the horizontal plane where the highest point of the secondary footrest pad is located is the sixth plane; when the seat is in the TV posture state, the third plane is located above the fourth plane, and the fifth plane is located below the sixth plane.

4. The seat according to claim 2 or 3, wherein, It further includes a footrest extension assembly; the main footrest assembly includes a main support plate, a linkage rod and an extension link; one end of the main support plate is used to support the user's foot; The other end is connected to one end of the extension link; both ends of the linkage rod are respectively connected to the main support plate and the secondary footrest assembly, and the other end of the extension link is connected to the footrest extension assembly.

5. The seat according to claim 4, wherein, The linkage rod includes a first linkage part connected to the main support plate and a second linkage part connected to the secondary footrest assembly, and an obtuse angle is formed between the first linkage part and the second linkage part.

6. The seat according to claim 5, wherein, When the seat is in the TV posture state, along the first direction, the first linkage part extends towards the side away from the secondary footrest assembly, and the angle between the first linkage part and the horizontal plane is a, and the range of a is 10° - 15°.

7. The seat according to claim 6, wherein, The angle between the first linkage part and the second linkage part is b, and the range of b is 155° - 165°; The length of the first linkage part is greater than the length of the second linkage part.

8. The seat according to claim 5, wherein, When the seat is in the TV posture state, along the first direction, the first linkage part extends towards the side away from the secondary footrest assembly, and the angle between the first linkage part and the horizontal plane is c, and the range of c is 25° - 35°.

9. The seat according to claim 8, wherein, The included angle between the first linkage part and the second linkage part is d, and the range of d is 100° - 110°; The length of the first linkage part is greater than the length of the second linkage part.

10. The seat according to claim 4, wherein The main support plate includes a first support part and a second support part. The connection point of the first support part and the second support part is connected to the linkage rod; an obtuse included angle is formed between the first support part and the second support part.

11. The seat according to claim 4, wherein The auxiliary footrest assembly includes an auxiliary support plate and an auxiliary footrest linkage; both ends of the auxiliary footrest linkage are respectively connected to the auxiliary support plate and the extension linkage and are disposed therebetween.

12. The seat according to claim 11, wherein The footrest extension assembly includes a first linkage, a second linkage, a third linkage, and a fourth linkage. Both ends of the first linkage are respectively connected to the auxiliary support plate and the second linkage; one end of the third linkage is connected to the extension linkage and the auxiliary support plate, and the other end of the third linkage is connected to the fourth linkage; the middle part of the first linkage is connected to the fourth linkage.

13. The seat according to claim 12, wherein The third linkage is bent toward one side of the first linkage; the third linkage and the first linkage partially overlap.

14. The seat according to claim 12, wherein It further includes a driving assembly; the driving assembly includes a driving member, a first extension linkage, and a second extension linkage; both ends of the first extension linkage are respectively connected to the driving member and the second extension linkage, and the second extension linkage is connected to the middle part of the fourth linkage.

15. The seat according to claim 4, wherein It further includes a base, a suspension assembly, a seat frame assembly, and a backrest assembly; the suspension assembly is respectively connected to the base and the seat frame assembly, and the backrest assembly and the footrest extension assembly are respectively connected to the front and rear ends of the seat frame assembly.

16. The seat according to claim 1, wherein When the seat is in a lying state, an included angle e is formed between the main footrest pad and the horizontal plane, and the degree range of the included angle e is 5° - 20°. An included angle f is formed between the auxiliary footrest pad and the horizontal plane, and the degree range of the included angle f is 7° - 23°; the included angle e is less than the included angle f.

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