Seat leg support assembly, seat structure and vehicle

Abstract

The utility model provides a seat leg support assembly, a seat structure and a vehicle, and belongs to the technical field of vehicle parts, and the seat leg support assembly comprises a mounting seat arranged at the bottom of a seat cushion and a leg support connected with the mounting seat through a transmission mechanism. A traction mechanism is arranged between the transmission mechanism and the seat base, and when the mounting seat ascends and descends along with the seat cushion, the leg support can be switched between a folded state and an unfolded state under the combined action of the transmission mechanism and the traction mechanism. In the folded state, the leg support is folded and stored below the mounting seat, and in the unfolded state, the leg support is overturned and unfolded to the front side of the mounting seat. According to the seat leg support assembly, when the seat is started to ascend and descend, switching between the folded state and the unfolded state can be completed, a driving device of the leg support does not need to be independently arranged, and extra driving devices can be effectively reduced, so that the manufacturing cost and the maintenance cost of the seat can be effectively reduced; and the legs of the passengers can be effectively prevented from colliding with the leg supports when getting on and off the bus.

Description

Technical Field

[0001] This utility model relates to the field of vehicle parts technology, and in particular to a seat leg support assembly. It also relates to a seat structure equipped with the seat leg support assembly, and a vehicle equipped with the seat structure. Background Technology

[0002] As a crucial functional component of car seats, leg rests provide leg support for occupants, making long journeys less arduous due to unsupported legs and fatigue. Leg rests typically incorporate motor-driven transmission mechanisms, allowing them to unfold and retract flexibly. When the seat cushion adjustment and leg rest work in conjunction, they complement each other, maximizing seat comfort. However, existing seats have significant design flaws, with numerous drive and control systems, resulting in higher manufacturing and maintenance costs.

[0003] Furthermore, the existing leg rests have design flaws when folded. Typically, when folded, the leg rest rests almost vertically against the front of the seat cushion. This makes it easy for occupants' legs to collide with and interfere with the leg rest when entering or exiting the vehicle, causing inconvenience and potentially posing a safety hazard. Utility Model Content

[0004] In view of this, the present invention aims to provide a seat leg support assembly that can reduce the manufacturing cost of the seat.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0006] A seat leg support assembly includes a mounting base disposed at the bottom of a seat cushion, and a leg support connected to the mounting base via a transmission mechanism;

[0007] A traction mechanism is provided between the transmission mechanism and the seat base. When the mounting seat rises and falls with the seat cushion, the leg rest can switch between a stowed state and an unfolded state under the combined action of the transmission mechanism and the traction mechanism.

[0008] In the stowed state, the leg rest is folded down and stored under the mounting base; in the unfolded state, the leg rest is flipped up and unfolded to the front of the mounting base.

[0009] Furthermore, the traction mechanism includes a traction rod, one end of which is hinged to the seat base, and the other end of which is hinged to the transmission mechanism.

[0010] Furthermore, the seat base is provided with a connecting rod, the connecting rod having a first end fixedly connected to the seat base, and a second end extending forward and upward toward the first end;

[0011] The traction rod is hinged to the second end.

[0012] Furthermore, the transmission mechanism includes a linkage assembly, a first transmission rod hinged between the linkage assembly and the mounting base, and a second transmission rod hinged between the linkage assembly and the leg support;

[0013] The linkage assembly is connected to the traction mechanism, and under the traction of the traction mechanism, the linkage assembly can extend and retract as the seat cushion rises and falls.

[0014] Furthermore, the linkage assembly includes a first link and a second link that are hinged together, and a third link and a fourth link that are cross-hinged together;

[0015] The first connecting rod is hinged to the mounting base, and one end of the first connecting rod is hinged together with one end of the traction rod and one end of the second connecting rod. The other end of the first connecting rod is hinged to one end of the third connecting rod, and the other end of the second connecting rod is hinged to one end of the fourth connecting rod.

[0016] The other end of the third link is hinged to the leg support, and the other end of the fourth link is hinged to the second transmission rod. The first transmission rod is connected to the hinge point of the third link and the fourth link.

[0017] Furthermore, the mounting base includes a top plate connected to the seat cushion, and side plates disposed on two opposite sides of the top plate, wherein the first connecting rod and the first transmission rod are both hinged to the side plates; and / or,

[0018] The leg support includes a supporting portion and connecting portions located on two opposite sides of the supporting portion, and both the fourth connecting rod and the second transmission rod are hinged to the connecting portions.

[0019] Compared with the prior art, this utility model has the following advantages:

[0020] The seat leg rest assembly of this utility model includes a mounting base and a leg rest connected to the mounting base via a transmission mechanism. A traction mechanism is provided between the transmission mechanism and the seat base. Therefore, when the seat lifting operation is initiated, the leg rest can switch between a retracted and extended state under the coordinated drive of the transmission mechanism and the traction mechanism. This eliminates the need for a separate drive device for the leg rest, as the lifting action of the seat cushion drives the leg rest state switching. This effectively reduces the investment in additional drive devices and controllers, thereby significantly reducing the manufacturing and maintenance costs of the seat. Furthermore, designing the leg rest to fold under the mounting base in the retracted state changes the traditional retracted leg rest configuration that is perpendicular to the front of the seat. Compared to existing technologies, this design significantly reduces the space occupied by the leg rest in front of the seat, effectively preventing collisions between the legs and the leg rest when passengers get on and off the vehicle.

[0021] Secondly, the traction mechanism includes a traction rod with one end hinged to the seat base and the other end hinged to the transmission mechanism. The structure is simple, and this direct hinged connection can form an efficient force transmission link. Compared with complex multi-part connections or indirect transmission forms, it is beneficial for the precise and rapid transmission of force between the seat base and the transmission mechanism. Moreover, the hinged design allows the traction rod to adaptively adjust its angle by virtue of the rotational freedom at its hinge point, effectively buffering the impact force caused by motion differences and avoiding structural damage that may be caused by rigid connections.

[0022] By installing a connecting rod on the seat base, with one end fixed to the seat base and the second end extending forward and upward towards the first end and hinged to the traction rod, the connecting rod, due to its tilt angle, can optimize and guide part of the support force from the base to the hinge point with the traction rod, effectively enhancing the mechanical load-bearing capacity of the entire traction mechanism and even the leg rest assembly. Simultaneously, it also helps to avoid the installation areas of other critical seat components, preventing interference with other parts.

[0023] Furthermore, by including a linkage assembly, a first transmission rod, and a second transmission rod in the transmission mechanism, the linkage assembly itself possesses the characteristic of multi-link coordinated operation. It can flexibly adjust the angles and relative positions between the links according to different force conditions, thereby achieving force distribution and transmission. In addition, thanks to its structural design, the linkage assembly can maintain good stability in complex dynamic environments. When the seat is subjected to external impact, the links in the linkage assembly can effectively buffer and disperse these impact forces through their relative rotation and extension, preventing the impact force from being directly transmitted to the leg rest and causing damage.

[0024] By making the linkage assembly consist of a first link, a second link, and a cross-hinged third and fourth link, a four-link cross-drive structure can be formed. When the traction rod is driven by the seat base to generate displacement, the first link and the second link form a lever linkage effect through the hinge point, which transforms the linear motion into the planar motion of the four-link mechanism. This helps to ensure that the leg rest maintains a stable motion trajectory during unfolding and storage, and avoids the shaking or jamming that may occur in traditional single-link transmission.

[0025] Furthermore, the mounting base adopts a structure combining a top plate and side plates, which not only provides good structural strength, but also allows the side plates to provide reliable hinge positions for the first connecting rod and the first transmission rod. This symmetrical hinge method ensures that the force is evenly distributed on the mounting base during transmission, preventing deformation or damage caused by excessive local stress. The leg support, including the supporting portion and the connecting portion located on the opposite side of its beam, also possesses good structural strength, improving the stability of the leg support. Hinging both the fourth connecting rod and the second transmission rod to the connecting portion ensures more balanced force distribution on the leg support, preventing tilting or jamming caused by uneven force distribution.

[0026] Another objective of this invention is to provide a seat structure that includes the seat leg support assembly as described above.

[0027] Furthermore, the seat cushion is mounted on the seat base via a lifting mechanism, and the seat base is provided with a drive unit that drives the lifting mechanism to move;

[0028] The lifting mechanism includes a front support and a rear support hinged to the front and rear ends of the seat base, respectively, and a force transmission component hinged between the front support and the front end of the seat cushion. The top end of the rear support is hinged to the rear end of the seat cushion.

[0029] Furthermore, the seat base is provided with a mounting plate, and the front support member is hinged to the mounting plate;

[0030] A limiting part is provided between the mounting plate and the front support member, and the limiting part is used to limit the rotation angle of the front support member.

[0031] This invention relates to a seat structure that, through the leg rest structure described above, eliminates the need for a separate drive mechanism for the leg rest. The leg rest's state can be switched using the seat cushion's lifting and lowering motion, effectively reducing the investment in additional drive mechanisms and controllers, and consequently lowering manufacturing and maintenance costs. Furthermore, the leg rest is designed to fold under the mounting base in its stowed state, changing the traditional stowage pattern where the leg rest is perpendicular to the front of the seat. Compared to existing technologies, this design significantly reduces the space occupied by the leg rest in front of the seat, effectively preventing collisions between the passenger's legs and the leg rest when getting on and off the vehicle.

[0032] Furthermore, the lifting mechanism employs a structure composed of a front support, a rear support, and a force transmission component. The front and rear supports are hinged to the front and rear ends of the seat base, respectively, with the top of the front support hinged to the rear end of the seat cushion, forming a stable support system. This structure evenly distributes force during seat cushion lifting, effectively resisting lateral and vertical forces generated by passenger weight, vehicle acceleration, or bumps, ensuring the seat remains stable at any height without swaying or tilting, greatly improving passenger safety and comfort.

[0033] Furthermore, by providing a limiting part between the mounting plate and the front support member, and using this limiting part to restrict the rotation angle of the front support member, when the transmission mechanism suddenly fails, causing its originally stable force transmission process to be disrupted, the limiting part can also effectively prevent the seat cushion from overturning due to loss of effective control by restricting the rotation of the front support member, thus ensuring the stability and safety of seat use.

[0034] In addition, this utility model also relates to a vehicle, which is provided with the seat structure described above.

[0035] The vehicle described in this utility model has all the beneficial effects of having the above-mentioned seat structure, which will not be repeated here. Attached Figure Description

[0036] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0037] Figure 1 This is a partial structural diagram of the seat structure described in this embodiment of the present invention with the leg rest in a stowed state;

[0038] Figure 2 This is a partial structural diagram of the leg support of the seat structure described in this embodiment of the present invention in the unfolded state;

[0039] Figure 3This is a partial structural diagram of the seat structure described in an embodiment of the present utility model from another perspective;

[0040] Figure 4 This is a partial structural diagram of the seat structure described in an embodiment of the present utility model from another perspective;

[0041] Figure 5 This is a partial structural diagram of the seat structure described in an embodiment of the present utility model;

[0042] Figure 6 for Figure 5 A schematic diagram of the structure shown from another perspective;

[0043] Figure 7 This is a schematic diagram of the structure of the seat base according to an embodiment of the present utility model;

[0044] Figure 8 This is a schematic diagram of the structure of the seat base, front support, transmission component, and connecting rod described in an embodiment of the present utility model;

[0045] Figure 9 This is a schematic diagram of the front support member described in an embodiment of the present utility model;

[0046] Figure 10 This is a schematic diagram of the seat leg support structure described in an embodiment of the present utility model;

[0047] Figure 11 This is a schematic diagram of the seat leg support structure described in an embodiment of the present utility model from another perspective;

[0048] Figure 12 This is a schematic diagram of the structure of the first connecting rod according to an embodiment of the present utility model.

[0049] Explanation of reference numerals in the attached figures:

[0050] 1. Seat cushion; 2. Seat base; 3. Leg rest; 4. Traction rod; 5. Linkage assembly; 6. Rear support; 7. Front support; 8. Force transmission component; 9. Rear support tube; 10. Front connecting tube; 11. Front support tube; 12. First transmission rod; 13. Second transmission rod; 14. Lead screw motor; 15. Mounting base; 16. Connecting rod;

[0051] 201, lower rail; 202, upper rail; 2021, mounting plate; 20211, limiting groove;

[0052] 501. First link; 502. Second link; 503. Third link; 504. Fourth link;

[0053] 701, Limit Block. Detailed Implementation

[0054] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0055] In the description of this utility model, it should be noted that the directional terms used in this embodiment, such as "up," "down," "left," "right," "front," and "rear," are defined based on the vertical, horizontal, and longitudinal directions of the vehicle. Specifically, the vertical direction of the vehicle is the height direction (Z-axis), the longitudinal direction is the length direction (X-axis), and the horizontal direction is the width direction (Y-axis). Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0056] Furthermore, in the description of this utility model, unless otherwise explicitly defined, the terms "installation," "connection," "joining," and "connector" 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 utility model in light of the specific circumstances.

[0057] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0058] Currently, to improve seat comfort, some seats are equipped with leg rests (3), which can be flexibly unfolded and folded thanks to a built-in motor-driven precision transmission mechanism. However, existing seats have significant design flaws, as their seat cushion lifting mechanism and leg rest (3) mechanism mostly rely on separate motors. On the one hand, the simultaneous operation of two motors significantly increases the vehicle's power consumption. On the other hand, the purchase and maintenance of two sets of motors and their associated complex control systems and transmission components increases the seat's manufacturing cost. Furthermore, existing leg rests (3) are almost vertically pressed against the front of the seat cushion when folded. This makes it highly susceptible to leg contact and interference when occupants enter or exit the vehicle, causing inconvenience and potentially posing safety hazards.

[0059] Therefore, this embodiment proposes a novel seat leg support assembly and a seat structure using this assembly. The seat leg support assembly includes a mounting base 15 located at the bottom of the seat cushion and a leg support 3 connected to the mounting base 15 via a transmission mechanism. Furthermore, a traction mechanism is provided between the transmission mechanism and the seat base 2. When the mounting base 15 rises and falls with the seat cushion, the leg support 3 can switch between a folded state and an unfolded state under the combined action of the transmission mechanism and the traction mechanism. In the folded state, the leg support 3 is folded and stored under the mounting base 15; in the unfolded state, the leg support 3 is flipped open and unfolded to the front of the mounting base 15.

[0060] The leg rest assembly of this embodiment includes a mounting base 15 and a leg rest 3 connected to the mounting base 15 via a transmission mechanism. A traction mechanism is provided between the transmission mechanism and the seat base 2. Therefore, when the seat lifting operation is initiated, the leg rest 3 can switch between a retracted and extended state under the coordinated drive of the transmission mechanism and the traction mechanism. This eliminates the need for a separate drive device for the leg rest 3; the state switching of the leg rest 3 is driven by the lifting action of the seat cushion, effectively reducing the investment in additional drive devices and controllers, thereby significantly reducing the manufacturing and maintenance costs of the seat. Furthermore, designing the leg rest 3 to fold under the mounting base 15 in the retracted state changes the traditional retracted mode where the leg rest 3 is perpendicular to the front of the seat. Compared to existing technologies, this design significantly reduces the lateral space occupied by the leg rest 3 in front of the seat, effectively preventing collisions between the legs and the leg rest 3 when passengers get on and off the vehicle.

[0061] Based on the above overview, this embodiment provides an exemplary structural reference for the seat leg rest assembly and seat structure. Figures 1 to 6 As shown in the figures, and to clearly illustrate the improvements of this embodiment, only a portion of the seat structure is shown in the accompanying drawings. Specifically, the lifting operation of the seat cushion 1 involves the front end of the cushion rising upwards while the rear end correspondingly lowers; conversely, when the seat cushion 1 lowers, the front end sinks downwards while the rear end rises. Therefore, to facilitate understanding of this embodiment, a general description of the seat structure is provided first. In terms of overall architecture, the seat structure of this embodiment is the same as that of common existing technologies, mainly including a seat base 2, a seat cushion 1, and a seat back, which, although not explicitly shown in the figures, is indispensable.

[0062] The seat base 2 comprises a lower rail 201 and an upper rail 202. The lower rail 201 is securely mounted on an external carrier, serving as a basic support structure. The upper rail 202, however, is movable, allowing it to slide flexibly relative to the lower rail 201 under the influence of a driving force, thereby enabling horizontal adjustment of the seat's position. Furthermore, in this embodiment, the seat cushion 1 is mounted on the seat base 2 via a lifting mechanism, and the seat base 2 is equipped with a drive unit that propels the lifting mechanism.

[0063] And see also Figure 3 and Figure 4 As shown, the lifting mechanism includes a front support 7 and a rear support 6 hinged to the front and rear ends of the seat base 2, respectively, and a force transmission member 8 hinged between the front support 7 and the front end of the seat cushion 1. The top end of the rear support 6 is hinged to the rear end of the seat cushion 1. From a mechanical perspective, this layout creates a stable support frame for the entire lifting process of the seat cushion, effectively dispersing the pressure from above the seat and ensuring that the seat maintains reliable performance under different usage scenarios.

[0064] Meanwhile, the force transmission component 8 can transmit the motion of the front support component 7 to the front end of the seat cushion 1. When the seat needs to be adjusted in height, the force transmission component 8 can quickly and smoothly convert the power into the upward displacement of the front end of the seat cushion 1 through its hinge structure, so that the lifting action can be realized efficiently. At the same time, during the dynamic process of the seat cushion 1 lifting and lowering, the rear support component 6 not only has to bear the support reaction force from below, but also, through its top hinge point with the rear end of the seat cushion 1, works with the force transmission component 8 to control the movement trajectory of the rear end of the seat cushion 1, ensuring that the seat cushion 1 is stable and smooth during the lifting or lowering process.

[0065] Furthermore, to improve the lifting stability of the seat cushion 1, as a preferred embodiment, the front support member 7, the rear support member 6, and the force transmission member 8 are all arranged in pairs facing each other from left to right. From the perspective of mechanical balance, this symmetrical layout structure can ensure that the force is evenly distributed throughout the entire support system when the seat cushion 1 is subjected to loads of different directions and magnitudes, effectively avoiding instability such as swaying and tilting caused by excessive force on one side, and greatly improving the reliability and durability of the seat.

[0066] Specifically, see Figure 3 As shown, a front connecting tube 10 and a front support tube 11 extending along the width direction of the seat are provided on the upper rail 202. Two front support members 7 are connected to the front connecting tube 10 and the front support tube 11 respectively. A force transmission member 8 is sleeved on the front support tube 11, and one end of the force transmission member 8 is hinged to the front support member 7 through the front support tube 11, and the other end is hinged to the seat cushion 1.

[0067] Additionally, see Figure 3 and Figure 4As shown in the diagram, in a preferred embodiment, to facilitate the hinge between the front support member 7 and the upper rail 202, a rearwardly extending mounting plate 2021 is provided on the front connecting pipe 10, and the front support member 7 is hinged to this mounting plate 2021. The mounting plate 2021 provides a good hinge point for the front support member 7, allowing the front support member 7 to rotate freely on it without loosening or displacement, thus ensuring the normal operation of the entire lifting mechanism. At the same time, the bottom end of the rear support member 6 is also connected to the upper rail 202 by hinge, and its top end is firmly combined with the seat cushion 1, forming a reliable support for the rear end of the seat cushion 1.

[0068] Furthermore, in order to further enhance the coordination and stability between the rear support members 6, a rear support tube 9 is connected between the two rear support members 6. This rear support tube 9 tightly connects the two rear support members 6 together, which can effectively distribute the pressure on the rear end of the seat cushion 1, so that the front and rear ends of the entire seat cushion 1 can be evenly supported during the lifting process.

[0069] To adapt to the seat's usage requirements under different operating conditions, the lead screw motor 14 is capable of slight oscillation relative to the upper rail 202 during lead screw extension and retraction. To achieve a tight connection between the lead screw motor 14 and the lifting mechanism, ensuring efficient and precise power transmission, combined with... Figure 3 As shown, a rearwardly extending connecting plate is provided on the front connecting pipe 10. The lead screw nut of the lead screw motor 14 is connected to the connecting plate, thereby converting the rotational power of the motor into the linear extension and retraction motion of the lead screw, which in turn drives the entire lifting mechanism to operate.

[0070] Furthermore, similar to common structures in traditional technologies, see [link to relevant documentation]. Figure 3 As shown, a limiting protrusion 701 that can abut against the lead screw nut is also provided at the free end of the lead screw. It, together with the lead screw nut and the housing of the lead screw motor 14, constitutes a limiting system. When the lead screw extends or retracts, the limiting protrusion 701 can abut against the lead screw nut in time. At the same time, the lead screw nut can also abut against the housing of the lead screw motor 14. Through this double abutment method, the extension and retraction length of the lead screw is precisely limited, thereby effectively limiting the flip angle of the seat cushion 1.

[0071] See Figure 3 and Figure 4As shown, in some embodiments, a mounting plate 2021 is provided on the seat base 2, and the front support member 7 is hinged to the mounting plate 2021. Furthermore, a limiting portion is provided between the mounting plate 2021 and the front support member 7 to limit the rotation angle of the front support member 7. This arrangement ensures that even if the transmission mechanism experiences a sudden failure, severely disrupting the originally stable force transmission process, the limiting portion can effectively prevent the seat cushion from excessively flipping due to loss of effective control by strictly limiting the rotation of the front support member 7, thus guaranteeing the stability and safety of the seat during use.

[0072] See Figure 7 and Figure 8 As shown, in this preferred embodiment, the limiting part includes a limiting groove 20211 provided on the mounting plate 2021 and a limiting block 701 protruding outwardly on the front support member 7. Specifically, referring to... Figure 9 As shown, the front support member 7 in this embodiment has a roughly arc-shaped plate structure. The limiting block 701 is made of screws screwed onto the front support member 7. This design is not only simple and easy to implement, but also facilitates later debugging and maintenance. At the same time, a first clearance groove is provided at the bottom of the front support member 7 to avoid the front connecting pipe 10. The existence of this clearance groove ensures that the front support member 7 will not interfere with the front connecting pipe 10 during rotation, thus ensuring the smooth operation of the entire lifting mechanism.

[0073] The structure of force transmission component 8 is referenced. Figure 8 As shown, it has a roughly triangular plate-like structure. This triangular design gives the force transmission component 8 better mechanical stability, making it more efficient and reliable in the process of transmitting force. In addition, a second clearance groove is also provided at the bottom of the force transmission component 8 to avoid the front connecting pipe 10. It is similar to the clearance groove at the bottom of the front support component 7, which together ensures the stable operation of the entire lifting mechanism under complex working conditions.

[0074] And see Figure 4 , Figure 8 and Figure 9 As shown, the traction mechanism in this embodiment includes a traction rod 4, one end of which is hinged to the seat base 2, and the other end of which is hinged to the transmission mechanism. This structure is simple, and this direct hinged connection can form an efficient force transmission link. Compared with complex multi-component connections or indirect transmission forms, it is beneficial for the precise and rapid transmission of force between the seat base 2 and the transmission mechanism. Moreover, the hinged design allows the traction rod 4 to adaptively adjust its angle by virtue of its rotational freedom at the hinge point, effectively buffering the impact force caused by motion differences and avoiding structural damage that may be caused by rigid connections.

[0075] Additionally, refer to Figure 5 and Figure 6 As shown, a connecting rod 16 is provided on the seat base 2. The connecting rod 16 has a first end fixedly connected to the seat base 2 and a second end extending forward and upward from the first end. The traction rod 4 is hinged to the second end. This arrangement allows the first end of the connecting rod 16 to be firmly connected to the seat base 2, while the second end extending forward and upward from the first end can change the direction of force transmission. Simultaneously, the arrangement of the connecting rod 16 avoids interference with other key components under the seat and provides a suitable hinge position for the traction rod 4. Specifically, the bottom end of the connecting rod 16 is fixedly connected to the aforementioned front connecting tube 10.

[0076] The transmission mechanism of this embodiment includes a linkage assembly 5, a first transmission rod 12 hinged between the linkage assembly 5 and the mounting base 15, and a second transmission rod 13 hinged between the linkage assembly 5 and the leg rest 3. Furthermore, the linkage assembly 5 is connected to a traction mechanism, and under the traction of the traction mechanism, the linkage assembly 5 can extend and retract with the lifting and lowering of the seat cushion 1. The transmission mechanism of this embodiment uses the linkage assembly 5 as its core, combined with the first transmission rod 12 and the second transmission rod 13. This multi-rod structure can flexibly adjust the angle and relative position between the linkages according to different force conditions. When the seat cushion lifts and lowers 1, generating power, the first transmission rod 12 quickly transmits the power from the mounting base 15 to the linkage assembly 5, and then the second transmission rod 13 transmits it to the leg rest 3. This coordinated linkage greatly improves the power transmission efficiency, ensuring that the leg rest 3 can quickly respond to the lifting and lowering of the seat cushion 1, achieving unfolding or retraction.

[0077] Furthermore, to improve the stability of the leg rest 3, two transmission mechanisms are symmetrically arranged on the left and right sides of the leg rest 3. This design evenly distributes the force applied to the legs, making it less prone to tilting, deformation, or localized damage under heavy pressure, greatly improving the load-bearing stability of the leg rest 3 and ensuring that the passenger's legs are always reliably supported. In one preferred embodiment, combined with... Figure 10 and Figure 11 As shown, the linkage assembly 5 in this embodiment includes a first linkage 501 and a second linkage 502 that are hinged together, and a third linkage 503 and a fourth linkage 504 that are cross-hinged together.

[0078] The first link 501 is hinged to the mounting base 15, and one end of the first link 501 is hinged together with one end of the traction rod 4 and one end of the second link 502. The other end of the first link 501 is hinged to one end of the third link 503, and the other end of the second link 502 is hinged to one end of the fourth link 504. Furthermore, the other end of the third link 503 is hinged to the leg support 3, and the other end of the fourth link 504 is hinged to the second transmission rod 13. The first transmission rod 12 is connected to the hinge point of the third link 503 and the fourth link 504.

[0079] In this embodiment, the linkage assembly 5 is constructed using a four-bar linkage structure formed by combining a first link 501, a second link 502, and a cross-hinged third link 503 and a fourth link 504. When the traction rod 4 is displaced by the seat base 2, the first link 501 and the second link 502 form a lever linkage effect through their shared hinge point, which can convert linear motion into planar motion of the four-bar linkage, ensuring smooth power transmission. The cross-hinged connection of the third link 503 and the fourth link 504 not only significantly improves the structural rigidity but also helps to better control the movement trajectory of the leg rest 3 during unfolding and retraction.

[0080] When the traction rod 4 moves upward, the first link 501 drives the third link 503 to move forward and downward, while the second link 502 drives the fourth link 504 to move backward and upward. With the help of the linkage of the cross hinge points, the leg rest 3 maintains a horizontal posture and rises smoothly during the unfolding process. When the traction rod 4 returns to its original position, the third link 503 and the fourth link 504 move in opposite directions in sync, driving the leg rest 3 to quickly and smoothly retract under the mounting base 15. There is no impact or vibration throughout the process, which helps to ensure a smooth user experience for passengers.

[0081] As a specific embodiment, refer to Figure 11 In this design, the traction rod 4 is curved and has reinforcing ribs extending along its length. This design effectively improves the bending and torsional resistance of the traction rod 4, ensuring a stable structural shape and preventing easy deformation or twisting. To facilitate the hinge connection between the first connecting rod 501 and the mounting base 15, [the following is a separate, unrelated section:] ... Figure 12 As shown, the first connecting rod 501 has a protrusion at the middle part that protrudes toward the mounting base 15 and is hinged to the mounting base 15 through the protrusion.

[0082] In addition, see Figure 10 As shown in the diagram, in a preferred embodiment, the mounting base 15 includes a top plate connected to the seat cushion 1, and side plates located on two opposite sides of the top plate. The first connecting rod 501 and the first transmission rod 12 are both hinged to the side plates. The mounting base 15 in this embodiment employs a structure combining the top plate and side plates, which provides it with good structural strength. The two side plates provide stable hinge points for the first connecting rod 501 and the first transmission rod 12. When the leg rest 3 is extended or bears pressure from the passenger's legs, the side plates effectively disperse these forces, preventing deformation or damage to the mounting base 15 caused by excessive localized stress, thus ensuring the reliability of the entire seat leg rest assembly structure.

[0083] In addition, continue to participate Figure 10 and Figure 11As shown, the leg support 3 in this embodiment includes a supporting portion and connecting portions located on two opposite sides of the supporting portion. The fourth connecting rod 504 and the second transmission rod 13 are both hinged to the connecting portions. This structure allows the leg support 3 to have better structural strength, which is beneficial for improving the stability of leg support. Hinging the fourth connecting rod 504 and the second transmission rod 13 to the connecting portions ensures that the leg support 3 is more evenly stressed, avoiding tilting or jamming caused by uneven stress.

[0084] Based on the above overall description, the seat structure of this embodiment, by setting the leg rest structure as described above, eliminates the need for a separate drive device for the leg rest 3. The leg rest 3 can be switched using the lifting and lowering motion of the seat cushion 1, effectively reducing the investment in additional drive devices and controllers, thereby significantly reducing the manufacturing and maintenance costs of the seat. Furthermore, designing the leg rest 3 to fold down under the mounting base 15 in the stowed state changes the traditional stowage mode where the leg rest 3 is perpendicular to the front of the seat. Compared to existing technologies, this design significantly reduces the space occupied by the leg rest 3 in front of the seat, effectively preventing collisions between the legs and the leg rest 3 when passengers get on and off the vehicle.

[0085] Furthermore, this embodiment also relates to a vehicle having the above-described seat structure.

[0086] The vehicle in this embodiment has all the beneficial effects of the above-described seat structure, which will not be described in detail here.

[0087] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A seat leg rest assembly, characterized in that: It includes a mounting base (15) located at the bottom of the seat cushion (1) and a leg rest (3) connected to the mounting base (15) via a transmission mechanism; A traction mechanism is provided between the transmission mechanism and the seat base (2). When the mounting seat (15) moves up and down with the seat cushion, the leg rest (3) can switch between a stowed state and an unfolded state under the combined action of the transmission mechanism and the traction mechanism. In the stored state, the leg support (3) is folded and stored under the mounting base (15), and in the unfolded state, the leg support (3) is flipped and unfolded to the front of the mounting base (15).

2. The seat leg support assembly according to claim 1, characterized in that: The traction mechanism includes a traction rod (4), one end of which is hinged to the seat base (2), and the other end of which is hinged to the transmission mechanism.

3. The seat leg support assembly according to claim 2, characterized in that: The seat base (2) is provided with a connecting rod (16), the connecting rod (16) having a first end fixedly connected to the seat base (2) and a second end extending forward and upward toward the first end; The traction rod (4) is hinged to the second end.

4. The seat leg support assembly according to claim 2, characterized in that: The transmission mechanism includes a linkage assembly (5), a first transmission rod (12) hinged between the linkage assembly (5) and the mounting base (15), and a second transmission rod (13) hinged between the linkage assembly (5) and the leg support (3). The linkage assembly (5) is connected to the traction mechanism, and under the traction of the traction mechanism, the linkage assembly (5) can extend and retract as the seat cushion (1) rises and falls.

5. The seat leg support assembly according to claim 4, characterized in that: The linkage assembly (5) includes a first link (501) and a second link (502) that are hinged together, and a third link (503) and a fourth link (504) that are cross-hinged together. The first connecting rod (501) is hinged to the mounting base (15), and one end of the first connecting rod (501) is hinged together with one end of the traction rod (4) and one end of the second connecting rod (502). The other end of the first connecting rod (501) is hinged to one end of the third connecting rod (503), and the other end of the second connecting rod (502) is hinged to one end of the fourth connecting rod (504). The other end of the third link (503) is hinged to the leg support (3), and the other end of the fourth link (504) is hinged to the second transmission rod (13). The first transmission rod (12) is connected to the hinge point of the third link (503) and the fourth link (504).

6. The seat leg support assembly according to claim 5, characterized in that: The mounting base (15) includes a top plate connected to the seat cushion (1) and side plates disposed on two opposite sides of the top plate. The first connecting rod (501) and the first transmission rod (12) are both hinged to the side plates; and / or, The leg support (3) includes a supporting part and a connecting part located on two opposite sides of the supporting part, and the fourth connecting rod (504) and the second transmission rod (13) are both hinged to the connecting part.

7. A seat structure, characterized in that: The seat structure includes the seat leg support assembly as described in any one of claims 1 to 6.

8. The seat structure according to claim 7, characterized in that: The seat cushion (1) is mounted on the seat base (2) via a lifting mechanism, and the seat base (2) is provided with a drive unit that drives the lifting mechanism to move. The lifting mechanism includes a front support member (7) and a rear support member (6) respectively hinged to the front and rear ends of the seat base (2), and a force transmission member (8) hinged between the front support member (7) and the front end of the seat cushion (1). The top end of the rear support member (6) is hinged to the rear end of the seat cushion (1).

9. The seat structure according to claim 8, characterized in that: The seat base (2) is provided with a mounting plate (2021), and the front support (7) is hinged to the mounting plate (2021); A limiting part is provided between the mounting plate (2021) and the front support member (7), and the limiting part is used to limit the rotation angle of the front support member (7).

10. A vehicle, characterized in that: The vehicle is provided with a seat structure as described in any one of claims 7 to 9.

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