Leg rest structure of a pure link automobile seat

Abstract

The utility model belongs to the technical field of automobile seat, it solves the problem that the leg support structure is complex and the use reliability is poor in prior art. Provide a kind of leg support structure of pure connecting rod automobile seat, including push rod and the connecting shaft hinged with push rod, the both ends of connecting shaft are respectively fixedly connected with connecting plate, connecting plate is respectively hinged with first connecting rod and fourth connecting rod, first connecting rod is crossed with connecting plate and is hinged with second connecting rod, and second connecting rod and connecting plate are respectively hinged with seat basin, first connecting rod and fourth connecting rod are respectively hinged with first leg support, connecting plate, first connecting rod, second connecting rod and seat basin and connecting plate, first connecting rod, fourth connecting rod and first leg support respectively form four connecting rod structure, first connecting rod and the one end of first leg support hinged still have arc elongated section, elongated section is hinged with second leg support and can drive second leg support relative to first leg support sliding. The utility model has the advantages of being capable of simplifying leg support structure and improving use reliability.

Description

Technical Field

[0001] This utility model belongs to the field of automotive seat technology and relates to a leg support structure for a pure linkage automotive seat. Background Technology

[0002] Car seat leg rests are adjustable devices located at the front of the seat. They are used to increase the support area for the passenger's legs, fill the entire leg bend, reduce discomfort caused by the legs being unsupported, reduce the impact of prolonged sitting on blood circulation, reduce leg pressure during long drives, and distribute body weight, thereby improving riding comfort. At the same time, by adjusting the position and / or angle of the leg rest, it can meet the needs of users of different heights and body types.

[0003] For example, Chinese patent literature discloses a leg rest adjustment mechanism and a car seat (application number: 202421695313.9), including: a leg rest assembly; the leg rest assembly includes: a first leg rest and a second leg rest, the second leg rest being slidably connected to the first leg rest; and a telescopic drive assembly is connected to the first leg rest and the second leg rest to drive the second leg rest to extend and retract relative to the first leg rest; wherein, the telescopic drive assembly includes a telescopic drive member and a telescopic transmission structure, the telescopic drive member being connected to the first leg rest, and the telescopic transmission structure being connected to the first leg rest and the second leg rest, and capable of amplifying the drive stroke of the telescopic drive member. The telescopic transmission structure includes: a first link and a second link, which are cross-arranged and hinged at the intersection position; wherein, both the first link and the second link have a power end and a resistance end, the distance between the power end and the intersection position is less than the distance between the resistance end and the intersection position; the telescopic drive member can drive the two power ends to move closer and further away, and the two resistance ends moving closer and further away can drive the second leg rest to extend and retract relative to the first leg rest.

[0004] The above-mentioned leg rest adjustment mechanism has the following shortcomings during use: the unfolding (or folding) of the leg rest assembly and the sliding of the second leg rest relative to the first leg rest require two motors to drive them through a transmission structure, which is complex and not conducive to the lightweight design of the seat. In addition, the space under the car seat is small, which makes installation and maintenance difficult. At the same time, the leg rest adjustment mechanism has high requirements for the coordination of the two motors. Once the coordination between the two motors is poor, it is easy to cause mechanical interference and affect the normal use of the leg rest. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a pure linkage leg support structure for automotive seats. The technical problem this invention aims to solve is how to simplify the leg support structure of automotive seats and improve their reliability.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] A leg support structure for a pure linkage car seat, the car seat including a seat basin and a leg support assembly, the leg support assembly including a first leg support and a second leg support slidably connected to the first leg support, characterized in that the leg support structure includes a push rod arranged along the fore-and-aft direction of the car seat and movable relative to the fore-and-aft direction of the car seat, a connecting shaft arranged along the left-and-right direction of the car seat and hinged to the push rod between the seat basin and the leg support assembly, connecting plates fixed to both ends of the connecting shaft, a first link and a fourth link respectively hinged to the connecting plates, the first link being arranged intersecting the connecting plates and hinged to the fourth link. The first link and the second link are hinged to the seat basin at their respective ends facing the basin. The connecting plate, the first link, the second link, and the seat basin form a four-link structure. The first link and the fourth link are hinged to the first leg rest at their respective ends facing the first leg rest. The connecting plate, the first link, the fourth link, and the first leg rest also form a four-link structure. The end of the first link that is hinged to the first leg rest also has an arc-shaped extension section. The extension section is hinged to the second leg rest and can drive the second leg rest to slide relative to the first leg rest.

[0008] The leg support structure of this pure linkage car seat only requires a single push rod to move back and forth along its axis when unfolding and retracting. Specifically, when the leg support structure needs to be unfolded, the push rod moves forward along its axis, pushing the connecting shaft to extend the double four-bar linkage structure forming a "scissor fork". Simultaneously, as the first link extends, its extended section drives the second leg support to move synchronously, achieving upward rotation of the entire leg support assembly relative to the seat basin and forward sliding of the second leg support relative to the first leg support. When the leg support structure needs to be retracted, the push rod moves backward along its axis, dragging the connecting shaft to retract the double four-bar linkage structure forming a "scissor fork". Simultaneously, as the first link retracts, its extended section drives the second leg support to move synchronously, achieving the extension of the leg support assembly. The downward rotation of the entire component relative to the seat basin and the backward sliding of the second leg rest relative to the first leg rest, coupled with the push rod being set along the front-to-back direction of the car seat and capable of moving back and forth relative to the car seat, allow for a longer forward and backward movement of the push rod. This enables the leg rest assembly to achieve maximum expansion or contraction in the front-to-back direction, while the "scissor fork" double four-bar linkage structure allows for minimum distance change in the vertical direction. Furthermore, this leg rest structure uses a single push rod and a pure linkage transmission structure, resulting in a simple structure. The linkage structure can withstand large impact loads and continuous loads, and wear after long-term use is mainly concentrated at the hinge points of the rods, making replacement and maintenance simple and convenient, and ensuring high reliability. This simplifies the leg rest structure of the car seat and improves its reliability.

[0009] In the aforementioned pure linkage car seat leg support structure, the front ends of the two connecting plates are respectively hinged to two first connecting brackets on the seat basin, and the rear ends of the two connecting plates are respectively hinged to two second connecting brackets on the first leg support via a fourth connecting rod. The upper ends of the two connecting plates are respectively hinged to the first connecting rod on the same side. The four connecting plates, first connecting rod, second connecting rod, and first connecting bracket form a four-bar linkage structure after being hinged together. The extensions of the two first connecting rods are respectively hinged to two third connecting brackets on the second leg support via a third connecting rod. By forming a "scissor fork" double four-bar linkage structure through the hinged connections of the connecting plates, first connecting rod, second connecting rod, and first connecting bracket, as well as the four connecting plates, first connecting rod, fourth connecting rod, and second connecting bracket, this structure can further improve the accuracy of the rotation of the leg support assembly relative to the seat basin and the sliding trajectory of the second leg support relative to the first leg support, as well as the reliability of the leg support structure.

[0010] In the aforementioned leg support structure of a pure linkage car seat, the first leg support is U-shaped, with L-shaped mounting plates connected to both sides. The second leg support is located between the mounting plates and the first leg support and is connected to an upper slide rail. A lower slide rail is connected to the mounting plates, and the upper slide rail is slidably mounted on the lower slide rail. This design allows for an integrated shape of the seat basin and leg support assembly cover.

[0011] In the aforementioned leg support structure of a pure linkage car seat, the second leg support also has a clearance hole into which the hinged portions of both the first and third linkages can extend. The rear sides of both the first and second leg supports are curved downwards. This design prevents motion interference between the hinged portions of the first and third linkages and the second leg support when the leg support structure is folded. Furthermore, the downward-curving rear sides of both the first and second leg supports reduce the likelihood of wrinkles on the cover covering the leg support assembly, thus achieving a more seamless visual effect.

[0012] In the aforementioned leg support structure of a pure linkage car seat, the second leg support is U-shaped, with L-shaped mounting plates connected to both sides. The first leg support is located between the mounting plates and the second leg support and is connected to an upper slide rail. A lower slide rail is connected to the mounting plates, and the upper slide rail is slidably mounted on the lower slide rail. This design can satisfy the requirement of a split design (where there is a seam between the seat cushion and leg support components).

[0013] In the aforementioned leg support structure of a pure linkage car seat, a mounting tube is fixedly connected between the two first connecting brackets. A motor for driving the push rod to move back and forth relative to the car seat is mounted on the mounting tube. The hinge points of the connecting plate and the second connecting rod, both located on the same side, with the first connecting brackets are located on opposite sides of the mounting tube. The mounting tube not only facilitates the installation and fixation of the motor but also enhances the structural strength of the leg support structure. Furthermore, the fact that the hinge points of the connecting plate and the second connecting rod with the first connecting brackets are located on opposite sides of the mounting tube prevents interference between the mounting tube and the movement of the connecting plate and the second connecting rod, thereby better enabling the leg support assembly to expand or retract to its maximum extent in the front-to-back direction.

[0014] In the aforementioned leg support structure of a pure linkage car seat, an arc-shaped plate is fixedly connected to the connecting shaft, with the concave side of the arc-shaped plate facing the motor. The end of the push rod near the leg support assembly is hinged to the arc-shaped plate. By setting the arc-shaped plate, the push rod can better push the connecting shaft and the connecting plate fixed to the connecting shaft to swing up and down, thereby better realizing the maximum expansion or contraction of the leg support assembly in the front-back direction.

[0015] In the aforementioned leg support structure of a pure linkage car seat, a support tube is fixedly connected between the two third connecting brackets, and a front cross tube is also fixedly connected to the seat basin. The middle part of the second linkage has an arc-shaped groove into which the side of the front cross tube can be inserted. The support tube, connecting shaft, mounting tube, and front cross tube are arranged parallel to each other. This improves the synchronization of movement of the first, second, third, and fourth linkages on both sides of the linkage assembly. At the same time, the support tube and front cross tube further enhance the structural strength of the leg support structure, allowing it to unfold and retract more stably. In the retracted state, the side of the front cross tube can be inserted into the arc-shaped groove of the second linkage, thereby further improving the stability of the leg support structure when retracted. Furthermore, the parallel arrangement of the support tube, connecting shaft, mounting tube, and front cross tube allows the leg support assembly to unfold or retract to its maximum extent in the front-rear direction, avoiding mutual interference.

[0016] Compared with existing technologies, the advantages of this pure linkage car seat leg support structure are as follows: When unfolding and retracting, the leg support structure of this pure linkage car seat only requires a single push rod to move back and forth along its axis, pushing or dragging the connecting shaft to form a double four-link structure retraction and extension in a "scissor fork" manner. Furthermore, the push rod is positioned along the front-to-back direction of the car seat and can move back and forth relative to the seat. This allows for maximum unfolding or retraction of the leg support assembly in the front-to-back direction, while minimizing distance changes in the vertical direction. Simultaneously, this leg support structure uses a single push rod and a pure linkage transmission structure, resulting in a simple structure. The linkage structure can withstand large impact loads and continuous loads, and wear after long-term use is mainly concentrated at the hinge points of the rods, making replacement and maintenance simple and convenient, and ensuring high reliability. This simplifies the leg support structure of the car seat and improves its reliability. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the leg support structure of the simple linkage car seat in Embodiment 1, showing its folded state.

[0018] Figure 2 This is a side view of the leg support structure of the simple linkage car seat in Embodiment 1 in the folded state.

[0019] Figure 3 This is a three-dimensional structural diagram of the leg support structure of the simple linkage car seat in Embodiment 1, viewed from below in its folded state.

[0020] Figure 4 This is a three-dimensional structural diagram of the leg support structure of the simple linkage car seat in Embodiment 1, in its unfolded state.

[0021] Figure 5 This is a side view of the leg support structure of the simple linkage car seat in Embodiment 1 in its unfolded state.

[0022] Figure 6 This is a three-dimensional structural diagram of the leg support structure of the simple linkage car seat in Embodiment 1, viewed from below in its unfolded state.

[0023] Figure 7 This is a schematic diagram illustrating the rotational unfolding principle of the leg support structure of the simple linkage car seat in Embodiment 1.

[0024] Figure 8 This is a three-dimensional structural diagram of the first link of the leg support structure of a pure linkage car seat.

[0025] Figure 9 This is a three-dimensional structural diagram of the leg support linkage assembly of a pure linkage car seat.

[0026] Figure 10This is a three-dimensional structural diagram of the leg support structure of the simple linkage car seat in Embodiment 2, viewed from below in its folded state.

[0027] Figure 11 This is a side view of the leg support structure of the simple linkage car seat in Embodiment 2 in its unfolded state.

[0028] Figure 12 This is a three-dimensional structural diagram of the leg support structure of the simple linkage car seat in Embodiment 2, viewed from below in its unfolded state.

[0029] In the diagram, 1. Seat basin; 2. Leg support assembly; 2a. First leg support; 2b. Second leg support; 2b1. Clearance hole; 3. Motor; 4. Push rod; 5. Linkage assembly; 6. Connecting shaft; 7. Front cross tube; 8. Connecting plate; 9. First connecting rod; 9a. Extension section; 10. Second connecting rod; 10a. Arc groove; 11. First connecting bracket; 12. Third connecting rod; 13. Second connecting bracket; 14. Fourth connecting rod; 15. Third connecting bracket; 16. Mounting plate; 17. Upper slide rail; 18. Lower slide rail; 19. Arc plate; 20. Mounting tube; 21. Support tube. Detailed Implementation

[0030] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0031] Example 1

[0032] A leg support structure for a pure linkage car seat, referring to Figure 1-9A leg support structure for a pure linkage car seat is disclosed. The car seat includes a seat basin 1 and a leg support assembly 2. The leg support assembly 2 includes a first leg support 2a and a second leg support 2b slidably connected to the first leg support 2a. The leg support structure includes a push rod 4 arranged along the front-rear direction of the car seat and movable relative to the front-rear direction of the car seat. A connecting shaft 6, hinged to the push rod 4, is arranged between the seat basin 1 and the leg support assembly 2 along the left-right direction of the car seat. Connecting plates 8 are fixedly connected to both ends of the connecting shaft 6. A first connecting rod 9 and a fourth connecting rod 14 are hinged to the connecting plates 8. The first connecting rod 9 is arranged intersecting the connecting plates 8 and hinged to a second connecting rod 10. Both the connecting rod 10 and the connecting plate 8 are hinged to the seat 1 at their ends facing the seat 1. The connecting plate 8, the first connecting rod 9, the second connecting rod 10, and the seat 1 form a four-bar linkage. The ends of the first connecting rod 9 and the fourth connecting rod 14 facing the first leg support 2a are hinged to the first leg support 2a. The connecting plate 8, the first connecting rod 9, the fourth connecting rod 14, and the first leg support 2a also form a four-bar linkage. The end of the first connecting rod 9 that is hinged to the first leg support 2a also has an arc-shaped extension 9a. The extension 9a is hinged to the second leg support 2b and can drive the second leg support 2b to slide relative to the first leg support 2a.

[0033] Reference Figure 2 , Figure 3 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9 Specifically, the front ends of the two connecting plates 8 are respectively hinged to the two first connecting brackets 11 on the seat basin 1, the rear ends of the two connecting plates 8 are respectively hinged to the two second connecting brackets 13 on the first leg support 2a through the fourth connecting rod 14, and the upper ends of the two connecting plates 8 are respectively hinged to the first connecting rod 9 on the same side. The four connecting plates 8, the first connecting rod 9, the second connecting rod 10 and the first connecting bracket 11 form a four-bar structure after being hinged. The four connecting plates 8, the first connecting rod 9, the fourth connecting rod 14 and the second connecting bracket 13 form a four-bar structure after being hinged. The extensions 9a of the two first connecting rods 9 are respectively hinged to the two third connecting brackets 15 on the second leg support 2b through the third connecting rod 12.

[0034] Reference Figure 2 , Figure 3 , Figure 5 and Figure 6More specifically, the first leg support 2a is U-shaped, and L-shaped mounting plates 16 are connected to both sides of the first leg support 2a. The second leg support 2b is located between the mounting plate 16 and the first leg support 2a and is connected to an upper slide rail 17. A lower slide rail 18 is connected to the mounting plate 16, and the upper slide rail 17 is slidably mounted on the lower slide rail 18.

[0035] In this preferred embodiment, the second leg support 2b also has a clearance hole 2b1 into which the hinged portions of the first connecting rod 9 and the third connecting rod 12 can extend. The rear sides of both the first leg support 2a and the second leg support 2b are curved downwards.

[0036] Reference Figure 2 , Figure 3 , Figure 5 and Figure 6 More specifically, a mounting tube 20 is fixed between the two first connecting brackets 11. A motor 3 for driving the push rod 4 to move back and forth relative to the car seat is mounted on the mounting tube 20. The hinge points of the connecting plate 8 and the second connecting rod 10 on the same side with the first connecting bracket 11 are respectively located on both sides of the mounting tube 20. An arc-shaped plate 19 is fixed to the connecting shaft 6. The concave side of the arc-shaped plate 19 is set towards the motor 3. The end of the push rod 4 near the leg support assembly 2 is hinged to the arc-shaped plate 19. A support tube 21 is fixed between the two third connecting brackets 15. A front cross tube 7 is also fixed to the seat basin 1. The middle part of the second connecting rod 10 has an arc-shaped groove 10a that allows the side of the front cross tube 7 to be inserted. The support tube 21, the connecting shaft 6, the mounting tube 20 and the front cross tube 7 are arranged parallel to each other.

[0037] The following section explains the working principle of the leg support structure of this pure linkage car seat:

[0038] When the leg support structure of this pure linkage car seat needs to be unfolded, the motor 3 drives the push rod 4 to move forward along the axial direction of the push rod 4. The push rod 4 pushes the connecting shaft 6 and the connecting plate 8 fixed on the connecting shaft 6 to swing upward through the arc plate 19. Then, the connecting plate 8 drags the first connecting rod 9 and the fourth connecting rod 14, which are hinged to it, to swing together around the hinge axis between the connecting plate 8 and the first connecting bracket 11. At the same time, the first connecting rod 9 and the fourth connecting rod 14 rotate around their respective hinge points. Since the distance from the hinge point of the connecting plate 8 and the fourth connecting rod 14 to the hinge point of the connecting plate 8 and the first connecting bracket 11 is greater than the distance from the hinge point of the connecting plate 8 and the first connecting rod 9 to the hinge point of the connecting plate 8 and the first connecting bracket 11, the connection mechanism is more efficient. The distance between the hinge points of bracket 11 is such that the linear velocity of the fourth link 14 is greater than that of the first link 9. The first link 9 and the fourth link 14 are hinged to the second connecting bracket 13, making the linear velocity at the hinge point of the fourth link 14 and the second connecting bracket 13 greater than that at the hinge point of the first link 9 and the second connecting bracket 13. This causes the second connecting bracket 13 to rotate around its hinge axis with the fourth link 14 and drive the first leg support 2a to rotate synchronously. At the same time, the second leg support 2b, which is slidably connected to the first leg support 2a, can move synchronously with the first leg support 2a, thereby realizing that the first leg support 2a and the second leg support 2b swing synchronously at the same angle.

[0039] Meanwhile, the first link 9 is connected to the first connecting bracket 11 via the second link 10, and to the third connecting bracket 15 via the third link 12. The distance between the hinge point of the first link 9 and the third link 12 and the hinge point of the second link 10 and the first connecting bracket 11 is much greater than the distance between the hinge point of the fourth link 14 and the second connecting bracket 13 and the hinge point of the connecting plate 8 and the first connecting bracket 11. Therefore, during swinging, the linear velocity at the hinge point of the first link 9 and the third link 12 is greater than the linear velocity at the hinge point of the second connecting bracket 13 and the fourth link 14. This creates a speed difference between the upper slide rail 17 and the lower slide rail 18, thereby achieving the effect of the second leg rest 2b sliding forward relative to the first leg rest 2a. When the leg rest structure of this pure linkage car seat needs to be folded, the motor 3 drives the push rod 4 to move backward in the opposite direction along the axis of the push rod 4. In this pure linkage car seat, the rotation of the leg support assembly 2 relative to the seat basin 1 and the sliding of the second leg support 2b relative to the first leg support 2a occur simultaneously. This avoids significant friction between the leg support assembly 2 and the user's legs caused by their sequential movement, resulting in a more comfortable user experience. Furthermore, the leg support structure of this pure linkage car seat ensures that the elongation and compression of the cover of the connection between the first leg support 2a and the seat cushion are ≤10mm during the process of the leg support structure moving from the folded state to the unfolded state. Within this length variation range, a visually seamless effect can be achieved, meaning that the cover covering the surface of the leg support assembly 2 will not wrinkle during movement.

[0040] Example 2

[0041] This embodiment is basically the same in structure and principle as Embodiment 1, the difference being: (Refer to...) Figure 8-12 The second leg support 2b is U-shaped, and L-shaped mounting plates 16 are connected to both sides of the second leg support 2b. The first leg support 2a is located between the mounting plates 16 and the second leg support 2b and is connected to an upper slide rail 17. A lower slide rail 18 is connected to the mounting plates 16, and the upper slide rail 17 is slidably mounted on the lower slide rail 18. This arrangement ensures that the positions of the first leg support 2a and the second leg support 2b in this embodiment are exactly opposite to those in Embodiment 1, satisfying the requirement for a split design (a seam effect is required between the seat cushion and the leg support assembly).

[0042] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A leg rest structure of a pure link type automobile seat, the automobile seat comprising a seat pan (1) and a leg rest assembly (2), the leg rest assembly (2) comprising a first leg rest (2a) and a second leg rest (2b) slidingly connected to the first leg rest (2a), characterized in that, This leg rest structure includes a push rod (4) arranged along the front-rear direction of the car seat and movable relative to the front-rear direction of the car seat. A connecting shaft (6) is arranged between the seat basin (1) and the leg rest assembly (2) along the left-right direction of the car seat and is hinged to the push rod (4). Connecting plates (8) are fixed to both ends of the connecting shaft (6). A first connecting rod (9) and a fourth connecting rod (14) are hinged to the connecting plate (8). The first connecting rod (9) is arranged crosswise with the connecting plate (8) and a second connecting rod (10) is hinged to it. The ends of the second connecting rod (10) and the connecting plate (8) facing the seat basin (1) are respectively hinged to the seat basin (1). (8) The first link (9), the second link (10) and the seat (1) form a four-bar linkage structure. The ends of the first link (9) and the fourth link (14) facing the first leg support (2a) are respectively hinged to the first leg support (2a). The connecting plate (8), the first link (9), the fourth link (14) and the first leg support (2a) also form a four-bar linkage structure. The end of the first link (9) that is hinged to the first leg support (2a) also has an arc-shaped extension section (9a). The extension section (9a) is hinged to the second leg support (2b) and can drive the second leg support (2b) to slide relative to the first leg support (2a).

2. The leg rest structure of a pure link type vehicle seat according to claim 1, wherein The front ends of the two connecting plates (8) are respectively hinged to the two first connecting brackets (11) on the seat basin (1), and the rear ends of the two connecting plates (8) are respectively hinged to the two second connecting brackets (13) on the first leg support (2a) through the fourth connecting rod (14). The upper ends of the two connecting plates (8) are respectively hinged to the first connecting rod (9) on the same side. The four connecting plates (8), the first connecting rod (9), the second connecting rod (10) and the first connecting bracket (11) form a four-bar structure after being hinged. The four connecting plates (8), the first connecting rod (9), the fourth connecting rod (14) and the second connecting bracket (13) form a four-bar structure after being hinged. The extensions (9a) of the two first connecting rods (9) are respectively hinged to the two third connecting brackets (15) on the second leg support (2b) through the third connecting rod (12).

3. The leg rest structure of a pure link type vehicle seat according to claim 2, wherein The first leg support (2a) is U-shaped, and L-shaped mounting plates (16) are connected to both sides of the first leg support (2a). The second leg support (2b) is located between the mounting plate (16) and the first leg support (2a) and is connected to an upper slide rail (17). A lower slide rail (18) is connected to the mounting plate (16), and the upper slide rail (17) is slidably mounted on the lower slide rail (18).

4. The leg rest structure of claim 3, wherein The second leg support (2b) also has a clearance hole (2b1) into which the hinge portion of both the first link (9) and the third link (12) can be inserted. The rear sides of both the first leg support (2a) and the second leg support (2b) are curved downwards.

5. The leg rest structure of claim 2, wherein The second leg support (2b) is U-shaped, and L-shaped mounting plates (16) are connected to both sides of the second leg support (2b). The first leg support (2a) is located between the mounting plate (16) and the second leg support (2b) and is connected to an upper slide rail (17). A lower slide rail (18) is connected to the mounting plate (16), and the upper slide rail (17) is slidably mounted on the lower slide rail (18).

6. A leg support structure for a pure linkage automobile seat according to any one of claims 2-5, characterized in that, An installation tube (20) is fixed between the two first connecting brackets (11). A motor (3) for driving the push rod (4) to move back and forth relative to the car seat is installed on the installation tube (20). The hinge points of the connecting plate (8) and the second connecting rod (10) on the same side and the first connecting bracket (11) are respectively located on both sides of the installation tube (20).

7. The leg support structure of a pure linkage automobile seat according to claim 6, characterized in that, An arc-shaped plate (19) is fixedly connected to the connecting shaft (6). The concave side of the arc-shaped plate (19) is set towards the motor (3). The end of the push rod (4) near the leg support assembly (2) is hinged to the arc-shaped plate (19).

8. The leg support structure of a pure linkage automobile seat according to claim 6, characterized in that, A support tube (21) is fixed between the two third connecting brackets (15), and a front horizontal tube (7) is also fixed on the seat (1). The middle part of the second connecting rod (10) has an arc-shaped groove (10a) that allows the side of the front horizontal tube (7) to be inserted. The support tube (21), connecting shaft (6), mounting tube (20) and front horizontal tube (7) are arranged parallel to each other.

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