Leg rest device and seat

Abstract

The application discloses a leg supporting device and a seat. The leg supporting device comprises a seat frame, a rotating assembly, and an extension mechanism. The rotating assembly comprises a rotating shaft pivotally connected with the seat frame and a supporting plate fixedly connected with the rotating shaft. The extension mechanism comprises an extension plate slidingly connected with the supporting plate, a connecting rod assembly rotatably connected with the supporting plate and connected with the extension plate, and a rotating rod hingedly connected with the seat frame and the connecting rod assembly and capable of rotating synchronously with the supporting plate. The rotating rod can drive the extension plate to slide relative to the supporting plate through the connecting rod assembly during rotation. The rotating assembly can drive the extension plate to rotate between a first position where the extension plate is folded below the supporting surface and a second position where the extension plate extends away from the seat frame. The leg supporting device and the seat are flexible in rotation and small in storage space.

Description

Technical Field

[0001] This application relates to the field of home technology, and in particular to a leg support device and a seat. Background Technology

[0002] With the development of the home furnishing industry, people have increasingly higher requirements for the functionality of seating. Currently, existing leg support adjustment mechanisms consist of a motor push rod or other multi-stage linkage mechanism connected by a motor to drive the leg support plate to rotate and fold upwards from under the seat. As the leg support rotates, the support plate extends, thus realizing the linkage function of leg support rotation and extension.

[0003] Because the leg rest extends as the leg rest rotates, it typically extends and rotates synchronously when the leg rest rotates and unfolds. Since the extension of the leg rest is proportional to the rotation angle, a large space needs to be left under the seat to prevent the leg rest from interfering with the ground during rotation. Furthermore, the multi-stage linkage mechanism is complex and, along with the leg rest, is located under the seat, occupying considerable space and resulting in a higher seat, thus affecting comfort. Summary of the Invention

[0004] To address the above technical problems, this application provides a leg support device and a seat that has a simple structure, occupies little space, and has high reliability, and can reduce the height of the seat.

[0005] In a first aspect, this application provides a leg support device, comprising:

[0006] The frame has a supporting surface;

[0007] The rotating assembly includes a rotating shaft pivotally connected to the frame and a support plate fixedly connected to the rotating shaft;

[0008] The extension mechanism includes an extension plate slidably connected to the pallet, a linkage assembly rotatably connected to the pallet and connected to the extension plate, and a rotating rod hinged to the seat and the linkage assembly respectively and capable of rotating synchronously with the pallet. During the rotation of the rotating rod, the extension plate can be driven to slide relative to the pallet through the linkage assembly.

[0009] The rotating component is capable of rotating the extension plate between a first position where it is retracted below the support surface and a second position where it extends away from the seat frame.

[0010] By adopting the above technical solution, the extension plate is slidably connected to the rotating component, changing the traditional connection structure where the extension plate can only rotate relative to the rotating component. The rotation radius of the extension plate at different rotational positions can be controlled by sliding the extension plate relative to the rotating component. The rotation of the rotating component drives the rotating rod and the extension plate to rotate together between the first and second positions. During the rotation of the rotating rod, the extension plate can be driven to slide relative to the support plate through the connecting rod assembly to achieve extension and retraction, reducing the chance of interference with the ground. The leg support device provides leg support through rotation and sliding. Its simple structure and small footprint allow for a lower seat height, enhancing user comfort. The rotating component's pivot shaft is pivotally connected to the seat frame. The shaft can be driven by an electric or pneumatic mechanism, or manually, to achieve the rotation and extension of the extension plate. This provides diverse driving methods and high reliability of the transmission structure. When using an electric or pneumatic mechanism to drive the shaft, the mechanism can be located on the side of the seat frame, not occupying space below the frame and further reducing the seat height.

[0011] In conjunction with the first aspect, a further embodiment is provided where a third position is provided between the first position and the second position. During the process of the rotating component rotating from the first position to the third position, the radius of the rotation trajectory of the end of the extension plate is not greater than the radius of rotation of the end of the extension plate when it is located in the first position.

[0012] By adopting the above technical solution, when the rotating component rotates from the first position to the third position, the rotating component rotates outward from under the seat frame, and the extension plate does not slide relative to the support plate or the sliding direction of the extension plate relative to the support plate is towards the rotating shaft. At this time, the rotation trajectory radius of the extension plate end is not greater than the rotation radius of the extension plate end when it is in the first position. This can make the rotation radius of the extension plate small when it rotates towards the ground, occupy less space under the seat frame, reduce the possibility of interference with the ground, and reduce the height of the seat frame.

[0013] In conjunction with the first aspect, a further embodiment includes a fourth position between the third position and the second position. During the rotation of the rotating assembly from the third position to the fourth position, the extension plate slides relative to the support plate to gradually increase the radius of the rotation trajectory at the end of the extension plate.

[0014] By adopting the above technical solution, when the rotating component rotates from the third position to the second position, the rotating component rotates vertically upwards towards the seat frame, and the sliding direction of the extension plate relative to the support plate is opposite to the rotating axis, so that the radius of the rotation trajectory at the end of the extension plate gradually increases, and the support area of ​​the extension plate and the support plate increases, so as to achieve the comfort of leg support.

[0015] In conjunction with the first aspect, a further solution is that during the process of the rotating assembly rotating from the fourth position to the second position, the radius of the rotation trajectory of the end of the extension plate remains unchanged.

[0016] By adopting the above technical solution, when the rotating component rotates from the fourth position to the second position, the extension plate and the support plate have already contacted the legs and driven the legs to rotate upward. The extension plate does not slide relative to the support plate, and the rotation trajectory radius of the end of the extension plate remains unchanged. The passenger can raise their legs simply by sitting in the seat without adjusting their posture, thus improving the passenger's comfort.

[0017] In conjunction with the first aspect, a further embodiment includes a linkage assembly comprising a first linkage, a second linkage, and a slide rod. One end of the first linkage is hinged to the extension plate, and the other end is hinged to the end of the second linkage. The middle portion of the second linkage is hinged to the support plate. The end of the second linkage away from the hinged first linkage is slidably connected to the slide rod. The slide rod is hinged to the rotating rod and is capable of sliding relative to the support plate under the drive of the rotating rod.

[0018] By adopting the above technical solution, the rotation of the rotating rod can drive the sliding rod to slide, the sliding rod drives the second connecting rod to rotate, which in turn drives the first connecting rod to rotate. When the first connecting rod rotates, it pushes the extension plate to slide relative to the support plate, so as to realize the extension or retraction of the extension plate.

[0019] In conjunction with the first aspect, a further solution is provided whereby the pallet is provided with a first sliding groove, the second connecting rod is provided with a second sliding groove, and the sliding rod is connected with a guide post that can slide along the first sliding groove and the second sliding groove. The hinge point between the second connecting rod and the pallet is located between the second sliding groove and the hinge point between the second connecting rod and the first connecting rod.

[0020] By adopting the above technical solution, during the rotation of the pallet, the rotating rod and the sliding rod slide along the first sliding groove. During the sliding of the sliding rod along the first sliding groove, it slides in the second sliding groove and drives the second connecting rod to rotate. The second connecting rod drives the first connecting rod to rotate and pushes the extension plate to slide relative to the pallet, thereby realizing the extension and retraction of the extension plate.

[0021] In conjunction with the first aspect, a further solution is provided whereby the pallet is provided with a third sliding groove, the hinge point of the rotating rod and the sliding rod slides along the third sliding groove, and the third sliding groove is parallel to the first sliding groove.

[0022] By adopting the above technical solution, because the rotation axes of the rotating rod and the pivot are not aligned, the hinge point between the rotating rod and the slide rod slides along the third slide groove during the rotation of the pallet. This allows the rotating rod to drive the slide rod to rotate during the rotation of the pallet, and the slide rod, in turn, drives the rotation of the second and first connecting rods to move the extension plate. The parallelism between the third and first slide grooves ensures smoother sliding of the slide rod and reduces the risk of jamming.

[0023] In conjunction with the first aspect, a further embodiment is provided in which the second slide groove includes a connected rotating groove and a sliding groove. When the rotating assembly rotates between the third position and the fourth position, the guide post slides along the rotating groove and the angle between the rotating groove and the first slide groove is not zero.

[0024] By adopting the above technical solution, when the rotating assembly rotates between the third and fourth positions, the guide post slides along the rotating groove. Since the angle between the rotating groove and the first sliding groove is not zero, the guide post pushes the second connecting rod to rotate when it slides along the first sliding groove, thereby driving the first connecting rod to rotate and realize the extension and retraction of the extension plate.

[0025] In conjunction with the first aspect, a further embodiment is that when the rotating assembly rotates between the fourth position and the second position, the guide post slides along the sliding groove and the angle between the sliding groove and the first sliding groove is zero.

[0026] By adopting the above technical solution, when the rotating component rotates between the fourth position and the second position, the angle between the sliding groove and the first sliding groove is zero, the first sliding groove and the second sliding groove coincide, and the guide post will not drive the second connecting rod to rotate when it slides along the first sliding groove and the second sliding groove. Therefore, the extension plate does not extend or retract. At this time, the extension plate is in the longest extension position and does not slide relative to the support plate. In this way, there is no friction on the legs during the process of lifting the legs, which increases the comfort of leg lifting.

[0027] Secondly, this application provides a seating device including the leg support device as described in the first aspect.

[0028] By adopting the above technical solutions, the seat height is lower, resulting in better seating comfort and greater design flexibility. The leg support device's extension plate between the first and second positions has multiple movement postures, allowing for different design options to meet user comfort needs, truly putting the user at the center and enhancing the user experience.

[0029] In summary, this application has at least one of the following beneficial technical effects:

[0030] 1. The leg support device of this application has a simple structure and is safe and reliable.

[0031] 2. The leg support device of this application has a small rotation space, and different rotation positions have different movements to achieve different functions, thus having a wider range of applications.

[0032] 3. The seat in this application can lower the seat height and the leg rest has multiple movement postures, which improves the riding comfort and enhances the user experience. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the structure of one embodiment of the leg support device of this application;

[0034] Figure 2 This is a top view of the leg support device of this application;

[0035] Figure 3 This is a simplified structural diagram of the extension mechanism of the leg support device in this application;

[0036] Figure 4 yes Figure 2 Sectional view of AA;

[0037] Figure 5 This is a structural schematic diagram of the leg support device at the first position of this application;

[0038] Figure 6 This is a structural schematic diagram of the third position of the leg support device in this application;

[0039] Figure 7 This is a structural schematic diagram of the fourth position of the leg support device in this application;

[0040] Figure 8 This is a structural schematic diagram of the leg support device in the fourth position, viewed from below.

[0041] Figure 9 yes Figure 8 Enlarged view of area A in the center (front view);

[0042] Figure 10 This is a structural schematic diagram of the second position of the leg support device in this application;

[0043] Figure 11 This is a motion trajectory diagram of the rotating assembly and extension mechanism of the leg support device in this application;

[0044] Figure 12 This is a schematic diagram of the drive mechanism of this application;

[0045] Figure 13 This is a schematic diagram of the drive mechanism in the first position;

[0046] Figure 14 This is a schematic diagram of the drive mechanism in the second position.

[0047] Figure label:

[0048] 1. Base frame; 11. Support surface; 12. Drive slide groove; 2. Rotating assembly; 21. Rotating shaft; 22. Support plate; 221. First slide groove; 222. Third slide groove; 223. Guide rail; 3. Extension mechanism; 31. Extension plate; 311. Guide groove; 312. End; 313. Bearing surface; 32. Linkage assembly; 321. First connecting rod; 322. Second connecting rod; 3221. Hinge shaft; 3222. Second slide groove; 3223. Rotating groove; 3224. Sliding groove; 323. Slide rod; 3231. Guide post; 33. Rotating rod; 331. Rotating rod shaft; 4. Drive mechanism; 41. Motor; 42. Gear plate; 421. Gear shaft; 422. Toothed part; 43. Gear; 44. First push rod ; 45. Second push rod; 46. Shaft push rod; a. Angle between the support surface and the surface of the extension plate in the third position; b. Angle between the support surface and the surface of the extension plate in the fourth position; H. Distance between the end and the pivot in the first position; L. Distance between the end and the pivot in the third position; J. Distance between the end and the pivot in the fourth position; K. Distance between the end and the pivot in the second position; O. First position; R. Second position; P. Third position; Q. Fourth position; T. Movement trajectory of the end of the support plate; X. Movement trajectory of the end of the extension plate between the first and third positions; Y. Movement trajectory of the end of the extension plate between the third and fourth positions; Z. Movement trajectory of the end of the extension plate between the fourth and second positions. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0050] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0051] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0052] In the description of this application, it should be understood that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0053] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, features in the following embodiments can be combined with each other.

[0054] Example 1

[0055] Please see Figure 1 and Figure 2 This is a schematic diagram of one embodiment of the leg support device. The leg support device includes a seat frame 1, a rotating assembly 2, an extension mechanism 3, and a drive mechanism 4, with the drive mechanism 4 connected to the side of the seat frame 1. The seat frame 1 has a support surface 11. The rotating assembly 2 includes a rotating shaft 21 pivotally connected to the seat frame 1 and a support plate 22 fixedly connected to the rotating shaft 21. The drive mechanism 4 is connected to the rotating assembly 2 for driving the rotating assembly 2 to rotate. The extension mechanism 3 includes an extension plate 31 slidably connected to the support plate 22, a connecting rod assembly 32 rotatably connected to the support plate 22 and connected to the extension plate 31, and a rotating rod 33 hinged to the seat frame 1 and the connecting rod assembly 32 and capable of rotating synchronously with the support plate 22. The extension plate 31 is provided with a guide groove 311 slidably connected to the support plate 22. During the rotation of the rotating rod 33, the extension plate 31 can be driven to slide relative to the support plate 22 along the guide groove 311 through the connecting rod assembly 32. The rotating assembly 2 can drive the extension plate 31 to rotate between a first position that is folded under the support surface 11 and a second position that extends away from the seat frame 1.

[0056] The linkage assembly 32 includes a first link 321, a second link 322, and a slide rod 323. One end of the first link 321 is hinged to the extension plate 31, and the other end is hinged to the end 312 of the second link 322. The middle part of the second link 322 is hinged to the support plate 22. The end of the second link 322 away from the hinged part of the first link 321 is slidably connected to the slide rod 323. The slide rod 323 is hinged to the rotating rod 33 and can slide relative to the support plate 22 under the drive of the rotating rod 33. The support plate 22 is provided with a first sliding groove 221 and a third sliding groove 222. The second link 322 is provided with a second sliding groove 3222. A guide post 3231 that can slide along the first sliding groove 221 and the second sliding groove 3222 is connected to the slide rod 323. The hinge point between the second link 322 and the support plate 22 is located between the second sliding groove 3222 and the hinge point between the second link 322 and the first link 321. The guide post 3231 is fixed or pivotally connected to the slide rod 323. The hinge point of the rotating rod 33 and the slide rod 323 slides along the third slide groove 222, which is parallel to the first slide groove 221.

[0057] Driven by the drive mechanism 4, the rotating assembly 2 can drive the extension plate 31 to rotate between a first position where it is folded under the support surface 11 and a second position where it extends away from the seat frame 1 after rotating at an obtuse angle.

[0058] Please see Figure 1 and Figure 2 The drive mechanism 4 is connected to the rotating shaft 21. When the drive mechanism 4 drives the rotating shaft 21 to rotate, the rotating shaft 21 drives the support plate 22 to rotate, and the support plate 22 drives the extension plate 31 to rotate together. Because the hinge shaft 3221 of the rotating rod 33 and the slide rod 323 is located in the third slide groove 222, when the support plate 22 rotates, it drives the rotating rod 33 to rotate, and the slide rod 323 can slide along the third slide groove 222 and the first slide groove 221. The third slide groove 222 and the first slide groove 221 are arranged parallel to each other. When the slide rod 323 slides, the guide post 3231 slides along the first slide groove 221 and the second slide groove 3222. When the included angle between the first slide groove 221 and the second slide groove 3222 does not coincide, the guide post 3231 pushes the second connecting rod 322 to rotate, and the second connecting rod 322 drives the first connecting rod 321 to move. The first connecting rod 321 pushes the extension plate 31 to slide relative to the support plate 22.

[0059] Please see Figure 2 and Figure 3 When the pallet 22 is rotating, the slide rod 323 slides left and right along the pallet 22. The slide rod 323 slides relative to the second link 322 and can drive the second link 322 to rotate. The second link 322 drives the first link 321 to move and pushes the extension plate 31 to slide left and right relative to the pallet 22.

[0060] Please see Figure 3 and Figure 4 The end 312 of the rotating rod 33, away from the hinged end of the base 1, is connected to a rotating shaft 331. The rotating shaft 331 is located in the third slide groove 222 and is hinged to the slide rod 323. When the support plate 22 rotates downward around the rotating shaft 21, it drives the rotating shaft 331 to rotate downward and slide relative to the third slide groove 222. The rotating shaft 331 drives the slide rod 323 to slide and drives the second connecting rod 322 and the first connecting rod 321 to rotate. The first connecting rod 321 pushes the extension plate 31 to slide left and right relative to the support plate 22 along the guide groove 311.

[0061] Please see Figures 5-11 The motion states of the rotating assembly 2 and the extension mechanism 3 relative to the seat 1 are clearly explained. In order to explain the motion trajectory of the end 312, the rotation radius of the end 312 is represented by the distance between the end 312 and the rotating shaft 21. The distance mentioned here is the shortest distance between the end 312 of the extension plate 31 and the axis of the rotating shaft 21.

[0062] Please see Figure 5 The diagram shows the first position of the leg support device. The drive mechanism 4 includes a motor 41, which is fixed to the side of the seat frame 1. The motor 41 serves as a power source to drive the rotating shaft 21 to rotate. The extension plate 31 and the support plate 22 are folded below the seat frame 1. The pressure-bearing surface 313 of the extension plate 31 is parallel to and opposite to the support surface 11 of the seat frame 1. The rotation radius of the end 312 is the distance between the end 312 and the rotating shaft 21 in the first position.

[0063] Please see Figure 6 The diagram illustrates the third position of the leg support device. A third position is provided between the first and second positions. During the rotation of the rotating component 2 from the first position to the third position, the radius of rotation of the end 312 of the extension plate 31 is not greater than the radius of rotation of the end 312 of the extension plate 31 when it is in the first position. That is, the distance between the end 312 and the rotating shaft 21 in the third position is not greater than the distance between the end 312 and the rotating shaft 21 in the first position. The extension plate 31 rotates downwards relative to the seat frame 1 at an angle around the rotating shaft 21. In specific installation applications, in this state, the pressure-bearing surface 313 of the extension plate 31 is approximately perpendicular to the ground. In the third position, the angle between the supporting surface 11 and the surface of the extension plate 31 ranges from 45° to 90°, and in this embodiment, it is 80°. In this state, the tilt angle of the seat frame 1 is relatively more comfortable, and the pressure-bearing surface 313 of the extension plate 31 is approximately perpendicular to the ground.

[0064] Please see Figures 7-9 The diagram illustrates the fourth position of the leg support device. A fourth position is provided between the third and second positions. During the rotation of the rotating component 2 from the third position to the fourth position, the extension plate 31 slides relative to the support plate 22, causing the radius of rotation of the end 312 of the extension plate 31 to gradually increase. In the third position, the extension plate 31 continues to rotate upwards relative to the seat frame 1 around the pivot 21 to the fourth position. In the fourth position, the angle between the support surface 11 and the surface of the extension plate 31 is between 120° and 140°, which is 140° in this embodiment. During the rotation of the extension plate 31 from the third to the fourth position, the extension plate 31 slides relative to the support plate 22. As it turns from the third to the fourth position, the distance between the end 312 and the pivot 21 gradually increases, meaning the radius of rotation of the end 312 gradually increases.

[0065] Please see Figure 8 and Figure 9 The support plate 22 is fixed with a guide rail 223 that slides with the guide groove 311 of the extension plate 31. During the process of the support plate 22 rotating around the pivot 21 from the third position to the fourth position, the connecting rod assembly 32 pushes the extension plate 31 to slide relative to the support plate 22 under the guidance of the guide rail 223 and the guide groove 311.

[0066] Please see Figure 9The second slide groove 3222 includes a connected rotating groove 3223 and a sliding groove 3224. When the rotating assembly 2 rotates between the third and fourth positions, the guide post 3231 slides along the rotating groove 3223 and the angle between the rotating groove 3223 and the first slide groove 221 is not zero. At this time, the guide post 3231 pushes the second connecting rod 322 to rotate. When the fourth position is reached, the guide post 3231 is located between the rotating groove 3223 and the sliding groove 3224. At this time, the sliding groove 3224 coincides with the first slide groove 221. The guide post 3231 continues to slide along the sliding groove 3224 and the first slide groove 221 without pushing the second connecting rod 322 to rotate, and the extension plate 31 does not move relative to the support plate 22.

[0067] Please see Figure 10 The diagram shows the second position of the leg support device. In the fourth position, the extension plate 31 does not slide relative to the support plate 22. When the rotating component 2 continues to rotate the extension plate 31 from the fourth position to the second position, the distance between the end 312 and the rotating shaft 21 remains unchanged. That is, the rotation radius of the end 312 of the extension plate 31 is constant, and the extension plate 31 has been extended to a suitable length to provide support for the legs. In the fourth position, the support surface 11 of the seat frame 1 and the pressure-bearing surface 313 of the extension plate 31 are basically parallel.

[0068] Please see Figure 11 The motion principle of the extension mechanism is analyzed and explained by the motion trajectory diagram of the rotating component 2 and the extension mechanism 3. The figure shows the structure of the first position O. The pivot shaft 21 between the rotating rod 33 and the seat 1 is located to the lower left of the pivot shaft 21 (i.e., the rotating shaft 21) between the support plate 22 and the seat 1. The extension plate 31 is slidably connected to the support plate. The rotating rod 33 is connected to the extension plate 31. The extension plate 31 rotates with the support plate 22 and can slide relative to the support plate 22 at the same time.

[0069] When the support plate 22 rotates counterclockwise downwards, it causes the extension plate 31 to rotate counterclockwise. In the region between the first position O and the third position P, the movement trajectory of the end 312 of the extension plate 31 between the first position O and the third position P is to the left of the movement trajectory of the end 312 of the support plate 22. That is, the extension plate 31 slides to the left relative to the support plate 22 and then slides to the right to reset. In this embodiment, it is designed so that when reaching the third position P, the extension plate 31 returns to the relative position of the support plate 22 as it was in the first position O. That is, the distance between the end 312 of the extension plate 31 and the rotating shaft 21 is the same in the first position O and the third position P. Within this range, the radius of the movement trajectory of the end 312 of the extension plate 31 between the first position O and the third position P is changed by the rotation rod 33. By restricting the two structures of the support plate 22 and the rotation rod 33, when the extension plate 31 rotates downwards from below the seat frame 1 to approximately vertical, the radius of the extension plate 31 remains unchanged. This reduces the space occupied by the rotation of the extension plate 31, allowing the seat height to be designed relatively low.

[0070] As the support plate 22 continues to rotate counterclockwise from the third position P to the fourth position Q, the rotating rod 33 pushes the extension plate 31 to slide relative to the support plate 22. The radius of the movement trajectory of the end 312 of the extension plate 31 between the third position P and the fourth position Q gradually increases, and the extension plate 31 extends outward to increase the support surface area 11.

[0071] Please see Figure 9 and Figure 11 As shown, in the fourth position, the guide post 3231 is located between the rotating groove 3223 and the sliding groove 3224. At this time, the sliding groove 3224 and the first sliding groove 221 coincide. The rotation of the rotating rod 33 will not push the second connecting rod 322 to rotate, that is, the extension plate 31 will not slide relative to the support plate 22. The radius of motion trajectory of the end 312 of the extension plate 31 remains unchanged between the third position P and the fourth position Q. The extension plate 31 in this section does not slide relative to the support plate 22 by the overlap of the sliding groove 3224 and the first sliding groove 221. This structure can also be used to achieve no relative sliding between the extension plate 31 and the support plate 22 between the first position O and the third position P. For example, a section of the sliding groove 3223 that overlaps with the first sliding groove 221 is also provided at the end of the rotating groove 3223 that is away from the sliding groove 3224 so that the rotating rod 33 cannot push the extension plate 31 to slide relative to the support plate 22. In this way, the radius of motion trajectory of the end 312 of the extension plate 31 between the first position O and the third position P remains unchanged, reducing the rotation space when the extension plate 31 rotates out from under the seat 1.

[0072] Please see Figure 12 The drive mechanism 4 of the leg support device includes a toothed plate 42, a gear 43, a first push rod 44, a second push rod 45, and a shaft push rod 46. The toothed plate 42 is pivotally connected to the seat frame 1 via a gear shaft 421. The gear 43 is pivotally connected to the seat frame 1 and meshes with the toothed plate 42 to achieve power transmission. The toothed plate 42 is also rotatably connected to the first push rod 44. The end of the first push rod 44 away from the toothed plate 42 is pivotally connected to the second push rod 45, and the end of the second push rod 45 away from the first push rod 44 is pivotally connected to the shaft push rod 46. The shaft push rod 46 is fixedly connected to the rotating shaft 21. The rotating shaft 21 is also fixedly connected to the support plate 22. The rotating shaft 21 can be a hollow cylinder, which can reduce weight and material costs, and also achieve effective rotation to solve the problem of uneven force on the side drive.

[0073] Please see Figure 13The diagram shows the structure of the drive mechanism 4 in the first position O. The toothed plate 42 has a toothed portion 422, which meshes with the gear 43 to achieve transmission. The seat also has a drive slide groove 12. During the rotation of the gear 43, which drives the toothed plate 42 to rotate, the pivot shaft 21, which connects the first push rod 44 and the second push rod 45, slides along the drive slide groove 12. In the first position O, the connection point between the toothed plate 42 and the first push rod 44 faces downward, the connection point between the first push rod 44 and the second push rod 45 is located at the right end of the drive slide groove 12, and the connection point between the shaft push rod 46 and the second push rod 45 is located on the right side of the pivot shaft 21.

[0074] Please see Figure 13 and Figure 14 In the direction shown in the diagram, gear 43 drives gear plate 42 to rotate clockwise, and the connection point between gear plate 42 and first push rod 44 rotates upward. First push rod 44 and second push rod 45 are connected by rotating shaft 21. Rotating shaft 21 slides to the left along drive slide groove 12 to the left end of drive slide groove 12. Second push rod 45 pushes shaft push rod 46 to rotate clockwise until the connection point between shaft push rod 46 and second push rod 45 is located on the left side of rotating shaft 21. This position is the second position R.

[0075] Example 2

[0076] This embodiment discloses a seating arrangement, specifically a chair or sofa, including the leg support device from Embodiment 1. The seat frame 1 supports the weight of the person sitting on it. A first position O is located below the seat frame 1. The rotating assembly 2 rotates approximately 180° from below the seat frame 1 to a second position R to provide leg support. Because the extension plate 31 does not extend when the leg support device rotates below the seat frame 1, the rotation space is small, allowing for a lower seat height and a more comfortable experience for the occupant.

[0077] The operation process or principle of this embodiment is as follows: the drive mechanism 4 drives the rotating shaft 21 to rotate, the rotating component 2 and the extension mechanism 3 move from the first position O to the second position R. During the process of moving from the first position O to the third position P, the extension plate 31 does not extend. During the process of moving from the third position P to the fourth position Q, the support plate 22 and the extension plate 31 rotate upward from below the seat frame 1, and the extension plate 31 slides and extends relative to the support plate 22. During the process of moving from the fourth position Q to the second position R, the extension plate 31 does not slide relative to the support plate 22, and the support plate 22 and the extension plate 31 support the legs to rotate and lift upward.

[0078] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes, modifications, substitutions, and variations can be made to the present invention without departing from its spirit and scope, and all such changes, modifications, substitutions, and variations fall within the scope of the present invention as claimed.

Claims

1. A leg rest device, characterized in that, The utility model relates to a seat frame (1) with a support surface (11), a rotating assembly (2) comprising a rotating shaft (21) pivotally connected to the seat frame (1) and a supporting plate (22) fixedly connected to the rotating shaft (21), and an extension mechanism (3) comprising an extension plate (31) slidingly connected to the supporting plate (22), a connecting rod assembly (32) pivotally connected to the supporting plate (22) and connected to the extension plate (31), and a rotating rod (33) hingedly connected to the seat frame (1) and the connecting rod assembly (32) respectively and capable of rotating synchronously with the supporting plate (22), the rotating rod (33) being capable of driving the extension plate (31) to slide relative to the supporting plate (22) through the connecting rod assembly (32) during rotation. The rotating assembly (2) is capable of driving the extension plate (31) to rotate between a first position (O) in which the extension plate (31) is folded under the support surface (11) and a second position (R) in which the extension plate (31) extends away from the seat frame (1). The connecting rod assembly (32) comprises a first connecting rod (321), a second connecting rod (322), and a sliding rod (323), the supporting plate (22) is provided with a third sliding groove (222), and the hinging points of the rotating rod (33) and the sliding rod (323) slide along the third sliding groove (222). A third position (P) is further provided between the first position (O) and the second position (R), during rotation of the rotating assembly (2) from the first position (O) to the third position (P), the radius of the rotation track of the end portion (312) of the extension plate (31) is not greater than the rotation radius of the end portion (312) of the extension plate (31) when the end portion (312) is located at the first position (O). A fourth position (Q) is further provided between the third position (P) and the second position (R), during rotation of the rotating assembly (2) from the third position (P) to the fourth position (Q), the extension plate (31) slides relative to the supporting plate (22) so that the radius of the rotation track of the end portion (312) of the extension plate (31) gradually increases. During rotation of the rotating assembly (2) from the fourth position (Q) to the second position (R), the radius of the rotation track of the end portion (312) of the extension plate (31) remains unchanged.

2. The leg rest device of claim 1, wherein One end of the first connecting rod (321) is hingedly connected to the extension plate (31), the other end is hingedly connected to the end portion (312) of the second connecting rod (322), the middle portion of the second connecting rod (322) is hingedly connected to the supporting plate (22), the end portion of the second connecting rod (322) away from the first connecting rod (321) is slidingly connected to the sliding rod (323), and the sliding rod (323) is hingedly connected to the rotating rod (33) and capable of sliding relative to the supporting plate (22) under the driving of the rotating rod (33).

3. The leg rest device of claim 2, wherein, ​ 4. The leg rest device of claim 3, wherein ​ 5. Leg rest device according to claim 3 or 4, characterized in that ​ 6. The leg rest device of claim 3, wherein The first sliding groove (221) is arranged on the supporting plate (22), the second sliding groove (3222) is arranged on the second connecting rod (322), the sliding rod (323) is connected with the guide column (3231) capable of sliding along the first sliding groove (221) and the second sliding groove (3222), and the hinging point of the second connecting rod (322) and the supporting plate (22) is located between the second sliding groove (3222) and the hinging point of the second connecting rod (322) and the first connecting rod (321).

7. The leg rest device of claim 6, wherein The third sliding groove (222) is parallel to the first sliding groove (221).

8. The leg rest device of claim 6, wherein, The second sliding groove (3222) comprises a rotating groove (3223) and a sliding groove (3224) in communication, when the rotating assembly (2) rotates between the third position (P) and the fourth position (Q), the guide column (3231) slides along the rotating groove (3223) and the included angle between the rotating groove (3223) and the first sliding groove (221) is not zero.

9. The leg rest device of claim 8, wherein, When the rotating assembly (2) rotates between the fourth position (Q) and the second position (R), the guide column (3231) slides along the sliding groove (3224) and the included angle between the sliding groove (3224) and the first sliding groove (221) is zero.

10. A seat furniture, characterized in that The leg supporting device comprises the leg supporting device according to any one of claims 1-9.

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