Single-motor four-way leg support

Abstract

The invention provides a single-motor four-way leg support which comprises a leg support mechanism, a driving mechanism assembly and cam structures arranged on the output sides of the two ends of the driving mechanism assembly respectively. The cam structure comprises a cam A and a cam B which are connected with each other; two first-section connecting rod mechanisms located on the separated sides of the two cams A are further arranged on the two sides of the driving mechanism assembly, and two second-section connecting rod mechanisms located on the opposite sides of the two cams B are further arranged on the driving mechanism assembly. According to the single-motor four-way leg support, transmission pressure is dispersed to the cam A and the cam B which are connected with each other, the burden of a single connecting base is relieved, and therefore the fatigue damage risk caused by long-term pressure bearing is reduced. The first-section connecting rod mechanism and the second-section connecting rod mechanism are connected to the lower rail plate and the upper rail plate respectively, force transmission is more uniform through the design, and mechanical distribution of the whole leg support mechanism is optimized.

Description

Technical Field

[0001] The invention relates to the technical field of automobile seat leg supports, and in particular to a single-motor four-direction leg support. Background Art

[0002] With the rapid development of the automobile industry, consumers have put forward higher requirements for the comfort and functionality of car seats. As an important part of the seat, the leg rest can provide support for the passengers' legs and relieve the discomfort caused by long-term riding. However, most of the existing car seat leg rest technologies can only achieve simple movement in two directions: one section of storage and one section of expansion. It cannot meet the requirements of the two-section extension and two-section merging of the leg rest, that is, it cannot achieve the secondary extension function of the leg rest.

[0003] The prior art patent with publication number CN109050369A describes a telescopic leg support structure for a car seat, which realizes the deployment and storage of the leg support through a driving assembly on a connecting seat. This design usually requires a connecting seat to bear all the transmission pressure, which may affect the stability and reliability of the leg support structure.

[0004] Specifically: The leg rest structure in patent CN109050369A realizes the deployment and storage of the leg rest through a driving assembly on a connecting seat. This design requires that the connecting seat must bear all transmission pressures, including the weight of the leg rest and various external forces during use. Long-term exposure to these pressures may cause fatigue damage to the connecting seat, thereby affecting the stability and reliability of the entire leg rest structure. Especially in the case of frequent use or bearing a large weight, the single-bearing point design is more prone to wear and breakage, limiting the service life and safety of the leg rest. Summary of the invention

[0005] The present invention proposes a single-motor four-way leg rest, which reduces the load borne by a single connection point by designing two independent cams to disperse the pressure, thereby reducing the risk of fatigue damage caused by long-term high-load operation.

[0006] The technical solution of the present invention is achieved in this way:

[0007] A single-motor four-way leg support comprises a leg support mechanism, a drive mechanism assembly and cam structures respectively arranged on the output sides of both ends thereof;

[0008] The cam structure comprises a cam A and a cam B connected to each other;

[0009] Two one-stage connecting rod mechanisms are also provided on both sides of the driving mechanism assembly, which are located on the separated sides of the two cams A, and two two-stage connecting rod mechanisms are also provided on the driving mechanism assembly, which are located on the opposite sides of the two cams B;

[0010] The leg support mechanism includes a lower rail plate, an upper rail plate, and a plurality of slide rail assemblies connecting opposite sides of the lower rail plate and the upper rail plate;

[0011] The end of the first-stage connecting rod mechanism is connected to the lower rail plate of the leg support mechanism, and the end of the second-stage connecting rod mechanism is connected to the upper rail plate of the leg support mechanism;

[0012] The first-stage linkage mechanism is provided with a linkage slide arm A on one side close to the cam A, and a bar-shaped linkage slide groove A adapted to the linkage slide arm A is provided on the cam A; the second-stage linkage mechanism is provided with a linkage slide arm B on one side close to the cam B, and an L-shaped linkage slide groove B adapted to the linkage slide arm B is provided on the cam B.

[0013] Furthermore, the driving mechanism assembly includes a fixed shaft, a connecting shaft and a motor;

[0014] The fixed shaft is symmetrically provided with a connecting plate A, a concentric adjuster is provided in the connecting plate A, a connecting plate B is fixed to the separated sides of two adjacent concentric adjusters, and the sides of two adjacent connecting plates B away from the concentric adjusters are symmetrically fixed to the connecting shaft, and the two ends of the connecting shaft extend to be fixed to the cam A and the cam B respectively;

[0015] A rotating shaft is provided on the output side of the motor, and two ends of the rotating shaft pass through the concentric adjuster and the connecting plate B and extend to be fixed to the cam A and the cam B.

[0016] Furthermore, a limiting shaft is provided on the connecting plate A, and the limiting shaft extends to the top of the cam A and the cam B.

[0017] Furthermore, the one-section connecting rod mechanism includes a guard plate fixed at the end of the fixed shaft, an active rod A is hinged on the guard plate, a driven rod A is hinged at the end of the active rod A, and a positioning plate is hinged at the end of the driven rod A; an active rod B is also hinged on the guard plate, a driven rod B is hinged at the end of the active rod B, and the end of the driven rod B is hinged to a side of the positioning plate away from the driven rod A; the top of the positioning plate is fixed to the bottom of the lower rail plate.

[0018] Furthermore, the linkage slide arm A is fixed to a side of a section of the driven rod A close to the cam A, and the linkage slide arm A extends from a side of a section of the driven rod A to the linkage slide groove A and slides along it.

[0019] Furthermore, the two-stage connecting rod mechanism includes a fixed plate fixed on the fixed shaft, and the fixed plate is located between the connecting plate A and the cam B; the end of the fixed plate is hinged with a two-stage active rod, the end of the two-stage active rod is hinged with a two-stage driven rod, and the end of the two-stage driven rod is hinged with a guide block, and the side of the guide block away from the two-stage driven rod is fixed to the bottom of the upper rail plate.

[0020] Furthermore, the linkage slide arm B is fixed to a side of the second-stage active rod close to the cam B, and a side of the linkage slide arm B away from the second-stage active rod extends into the linkage slide groove B and slides along it.

[0021] Furthermore, it also includes a balancing shaft, two ends of which are fixed on opposite sides of two adjacent two-stage driven rods.

[0022] Beneficial effects of the technical solution provided by this application:

[0023] 1. The single-motor four-way leg rest realizes the one-stage and two-stage movement of the leg rest by introducing a single-motor four-way leg rest, thus breaking through the limitation of the existing technology that the leg rest can only realize simple one-stage storage and unfolding. This design enables the leg rest to be extended and merged in two stages, that is, the secondary extension function of the leg rest is realized, which greatly improves the adjustment range of the leg rest and the comfort of the passengers.

[0024] 2. The single-motor four-way leg support reduces the burden on the single connection seat by dispersing the transmission pressure to two interconnected cams A and B, thereby reducing the risk of fatigue damage caused by long-term pressure. The first-stage connecting rod mechanism and the second-stage connecting rod mechanism are connected to the lower rail plate and the upper rail plate respectively. This design makes the force transmission more uniform and optimizes the mechanical distribution of the entire leg support mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 This is a schematic diagram of the deployment of a single-motor four-way leg support of the present invention;

[0027] Figure 2 This is a schematic diagram of the single-motor four-way leg support retraction of the present invention;

[0028] Figure 3 This is a schematic diagram of the explosion of a single-motor four-way leg support of the present invention;

[0029] Figure 4 It is a schematic diagram of the decomposition of the drive mechanism assembly and the cam structure of the present invention.

[0030] In the figure:

[0031] 100 driving mechanism assembly, 110 fixed shaft, 120 connecting plate A, 130 concentric regulator, 140 connecting plate B, 150 connecting shaft, 160 motor, 170 rotating shaft, 180 limiting shaft;

[0032] 200 cam structure, 210 cam A, 211 linkage slideway A, 220 cam B, 221 linkage slideway B;

[0033] 300 a section of connecting rod mechanism, 310 a guard plate, 320 a section of active rod A, 330 a section of driven rod A, 340 a section of active rod B, 350 a section of driven rod B, 360 a linkage sliding arm A;

[0034] 400 two-stage connecting rod mechanism, 410 fixing plate, 420 two-stage active rod, 430 two-stage driven rod, 440 derivation block, 450 linkage sliding arm B, 460 balance shaft;

[0035] 500 leg support mechanism, 510 lower rail plate, 520 upper rail plate, 530 slide rail assembly. DETAILED DESCRIPTION

[0036] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] Reference Figure 1-4 , a single-motor four-way leg support, comprising a leg support mechanism 500, a drive mechanism assembly 100 and cam structures 200 respectively arranged on the output sides of both ends thereof; the cam structure 200 comprises a cam A210 and a cam B220 connected to each other; two sides of the drive mechanism assembly 100 are also provided with two one-stage connecting rod mechanisms 300 located on the separated sides of the two cams A210, and the drive mechanism assembly 100 is also provided with two two-stage connecting rod mechanisms 400 located on the opposite sides of the two cams B220; the leg support mechanism 500 comprises a lower rail plate 510, an upper rail plate 520 and A plurality of slide rail assemblies 530 are connected to the opposite sides of the two; the end of the first link mechanism 300 is connected to the lower rail plate 510 of the leg support mechanism 500, and the end of the second link mechanism 400 is connected to the upper rail plate 520 of the leg support mechanism 500; the first link mechanism 300 is provided with a linkage slide arm A360 on the side close to the cam A210, and the cam A210 is provided with a bar-shaped linkage slide groove A211 adapted to the linkage slide arm A360; the second link mechanism 400 is provided with a linkage slide arm B450 on the side close to the cam B220, and the cam B220 is provided with an L-shaped linkage slide groove B221 adapted to the linkage slide arm B450.

[0038] The leg rest mechanism 500 is a basic structure for realizing the expansion and contraction of the leg rest, which includes a lower rail plate 510, an upper rail plate 520, and a plurality of slide rail assemblies 530 connecting the opposite sides of the two. The slide rail assembly 530 is usually composed of an upper slide rail and a lower slide rail, and the upper and lower slide rails are respectively connected to the upper rail plate 520 and the lower rail plate 510. These components work together to provide a guide rail and support for the movement of the leg rest, ensuring the stability and accuracy of the leg rest during the expansion and contraction process. The working principle of the leg rest mechanism 500 is based on the linear movement of the slide rail assembly 530, and the expansion and contraction of the leg rest is realized through the relative movement of the lower rail plate 510 and the upper rail plate 520. The slide rail assembly 530 provides a stable movement path to ensure the precise positioning of the leg rest during the adjustment process.

[0039] The driving mechanism assembly 100 is the power source for the leg rest movement. It is driven by a motor to realize the automatic expansion and contraction of the leg rest. The design of this assembly allows the leg rest to be adjusted according to different needs, improving the convenience and comfort of use. The driving mechanism assembly 100 drives the cam structure 200 connected thereto to rotate through the rotation of the motor. The rotation of the cam is transmitted to the leg rest mechanism 500 through the connecting rod mechanism, thereby realizing the expansion and contraction of the leg rest.

[0040] The cam structure 200 includes a cam A 210 and a cam B 220 connected to each other, which convert the rotational motion of the motor into the extension motion of the leg support mechanism through a specific profile design. The coordinated work of cam A and cam B allows the leg support to be precisely adjusted to the first and second stages. The working principle of the cam structure 200 is based on the contact between the cam profile and the linkage slide arm. When the cam rotates, its profile pushes the linkage slide arm to move along a preset path, thereby driving the connecting rod mechanism to produce corresponding movement, thereby realizing the expansion and contraction of the leg support.

[0041] The first-stage connecting rod mechanism 300 and the second-stage connecting rod mechanism 400 are intermediate components connecting the cam structure and the leg support mechanism, which transmit the rotational motion of the cam to the leg support mechanism to realize the first-stage and second-stage motion of the leg support. The design of these connecting rod mechanisms ensures the smoothness and accuracy of the leg support motion. The working principle of the first-stage connecting rod mechanism 300 and the second-stage connecting rod mechanism 400 is through the interaction of the linkage slide arm A360 and the linkage slide arm B450 with the linkage slide groove A211 and the linkage slide groove B221 on the cam A210 and the cam B220. When the cam rotates, the linkage slide arm moves along the slide groove, driving the connecting rod mechanism to produce corresponding motion, thereby pushing the leg support mechanism to expand or contract.

[0042] The driving mechanism assembly 100 includes a fixed shaft 110, a connecting shaft 150 and a motor 160; a connecting plate A120 is symmetrically arranged on the fixed shaft 110, a concentric adjuster 130 is arranged in the connecting plate A120, a connecting plate B140 is fixed to each of the separated sides of two adjacent concentric adjusters 130, and the sides of two adjacent connecting plates B140 away from the concentric adjusters 130 are symmetrically fixed on the connecting shaft 150, and the two ends of the connecting shaft 150 are respectively extended to be fixed to the cam A210 and the cam B220; a rotating shaft 170 is provided on the output side of the motor 160, and the two ends of the rotating shaft 170 pass through the concentric adjuster 130 and the connecting plate B140 and extend to be fixed to the cam A210 and the cam B220.

[0043] The fixed shaft 110 and the connecting shaft 150 constitute the main skeleton of the drive mechanism assembly 100, which provide stable support and precise positioning for the entire drive system. The connecting plate A120 on the fixed shaft 110 and the connecting plate B140 on the connecting shaft 150 jointly ensure the correct installation and alignment of the cam A210 and the cam B220. The fixed shaft 110 and the connecting shaft 150 connect the cam A210 and the cam B220 together through the connecting plate A120 and the connecting plate B140 to form a stable transmission system. The motor 160 is connected to these shafts through the rotating shaft 170, and the rotational motion of the motor is transmitted to the cam through the rotating shaft, thereby driving the movement of the leg support mechanism 500.

[0044] The connecting plate A120 is connected to the fixed shaft 110 through the concentric adjuster 130, and the connecting plate B140 connects the connecting shaft 150 to the cam A210 and the cam B220. This design allows the position of the cam to be fine-tuned when necessary to ensure the accuracy and reliability of the transmission system. The concentric adjuster 130 allows the distance between the connecting plate A120 and the connecting plate B140 to be precisely adjusted, thereby fine-tuning the relative position of the cam A210 and the cam B220. This adjustment capability is essential to ensure the precise movement of the leg support mechanism 500, especially when fine adjustments to the leg support are required. The concentric adjuster 130, through its adjustable design, allows the technician to adjust the distance between the connecting plate A120 and the connecting plate B140 according to actual needs, thereby adjusting the relative position of the cam A210 and the cam B220. This adjustment can optimize the movement path of the leg support and ensure its stability and accuracy during expansion and contraction.

[0045] The connection plate A120 is provided with a limiting shaft 180, and the limiting shaft 180 extends to the top of the cam A210 and the cam B220.

[0046] The limit shaft 180 is arranged on the connecting plate A120, and its main function is to provide a limit function in the vertical direction for the cam A210 and the cam B220. This means that the limit shaft 180 can prevent the cam from excessively moving up and down during the movement, thereby ensuring the stability and reliability of the cam movement, and also protecting the entire drive mechanism from unnecessary mechanical shocks. When the cam A210 and the cam B220 move up and down with the rotation of the shaft 170, the limit shaft 180 acts as a physical barrier to prevent the cam from continuing to move up or down beyond its design limit. This limit mechanism is the key to preventing the cam from interfering with or being damaged by other components due to excessive movement.

[0047] Furthermore, the one-stage connecting rod mechanism 300 includes a guard plate 310 fixed at the end of the fixed shaft 110, an active rod A320 is hinged on the guard plate 310, a driven rod A330 is hinged at the end of the active rod A320, and a positioning plate 370 is hinged at the end of the driven rod A330; an active rod B340 is also hinged on the guard plate 310, a driven rod B350 is hinged at the end of the active rod B340, and the end of the driven rod B350 is hinged to the side of the positioning plate 370 away from the driven rod A330; the top of the positioning plate 370 is fixed to the bottom of the lower rail plate 510.

[0048] The guard plate 310 is fixed to the end of the fixed shaft 110, and its main function is to serve as a support and connection basis for a section of the connecting rod mechanism 300. It provides a hinge point for a section of the active rod A320 and a section of the active rod B340, ensuring the stable operation of the connecting rod mechanism and protecting the internal mechanical components from external damage. The guard plate 310 connects a section of the active rod A320 and a section of the active rod B340 in a hinged manner, so that the two rods can rotate around the hinge point. This design allows the connecting rod mechanism to flexibly adjust the angle when transmitting power to adapt to the movement requirements of the leg support mechanism 500.

[0049] An active rod A320 and a driven rod A330 constitute part of the connecting rod mechanism, which are connected by a hinge to form a mechanical chain that can transmit power and motion. As a power transmitter, the active rod A320 transmits its movement to the positioning plate 370 through a driven rod A330, thereby driving the movement of the leg support mechanism 500. When the cam A210 rotates, the active rod A320 is pushed through the linkage slide arm A360 to rotate around the hinge point on the guard plate 310. This rotation is transmitted to the positioning plate 370 through a driven rod A330, thereby pushing the lower rail plate 510 to move, thereby realizing the expansion or contraction of the leg support.

[0050] An active rod B340 and a driven rod B350 are similar to an active rod A320 and a driven rod A330, and are also part of the connecting rod mechanism. They work together to ensure that the leg support mechanism 500 can move smoothly and accurately. The movement of an active rod B340 is transmitted to the positioning plate 370 through a driven rod B350. This design is usually used to balance the torque of the connecting rod mechanism, ensure that the force is transmitted more evenly during the movement of the leg support, reduce the burden of a single component, and improve the stability and durability of the entire system.

[0051] The positioning plate 370 is the end component of a section of the connecting rod mechanism 300, which is fixed to the bottom of the lower rail plate 510 and plays the role of connecting and transmitting power. The positioning plate 370 ensures that the movement of the connecting rod mechanism can be accurately converted into the movement of the leg support mechanism. The positioning plate 370 transmits the movement of the connecting rod mechanism to the lower rail plate 510 through its connection with a section of the driven rod A330 and a section of the driven rod B350. When a section of the driven rod A330 and a section of the driven rod B350 move under the drive of the cam, the positioning plate 370 moves accordingly, pushing the lower rail plate 510 to perform corresponding expansion or contraction movements to achieve the adjustment of the leg support.

[0052] The linkage slide arm A360 is fixed to a side of a driven rod A330 close to the cam A210, and the linkage slide arm A360 extends from a side of a driven rod A330 to the linkage slide groove A211 and slides along it.

[0053] The linkage slide A360 is a key component in a section of the connecting rod mechanism 300, and its function is to convert the rotational motion of the cam A210 into the linear motion of a section of the driven rod A330. The linkage slide A360 realizes the transmission of power and the conversion of motion by interacting with the linkage slide A211 on the cam A210. When the cam A210 rotates, the linkage slide A211 on it contacts the linkage slide A360. One end of the linkage slide A360 is fixed on a section of the driven rod A330, and the other end slides in the linkage slide A211. The rotational motion of the cam pushes the linkage slide A360 to move in the slide, and this movement is transmitted to a section of the driven rod A330 through the linkage slide A360, causing it to move, thereby driving the movement of the leg support mechanism 500.

[0054] The interaction between the linkage slide arm A360 and the linkage slide groove A211 is the core of achieving the movement control of the leg rest. This design allows precise control of the expansion and contraction of the leg rest, ensuring the smoothness and accuracy of the movement. The linkage slide arm A360 is designed to slide freely in the linkage slide groove A211 while maintaining contact with the groove. When the cam A210 rotates, the change in the profile of the linkage slide groove A211 pushes the linkage slide arm A360 to move along the designed path. This movement directly leads to the movement of a section of the follower rod A330, thereby achieving precise control of the leg rest mechanism 500. By precisely designing the profile of the linkage slide groove A211, the movement speed and distance of the leg rest can be controlled to meet different riding comfort requirements.

[0055] The two-stage connecting rod mechanism 400 includes a fixing plate 410 fixed on the fixed shaft 110, and the fixing plate 410 is located between the connecting plate A120 and the cam B220; the end of the fixing plate 410 is hinged with a two-stage active rod 420, the end of the two-stage active rod 420 is hinged with a two-stage driven rod 430, and the end of the two-stage driven rod 430 is hinged with a guide block 440, and the side of the guide block 440 away from the two-stage driven rod 430 is fixed to the bottom of the upper rail plate 520.

[0056] The fixing plate 410 plays a supporting and positioning role in the two-stage linkage mechanism 400. It is fixed on the fixed shaft 110 and is located between the connecting plate A120 and the cam B220, providing a stable hinge point for the two-stage active rod 420. This design ensures the movement accuracy and stability of the two-stage linkage mechanism. The fixing plate 410 provides a fixed rotation center for the two-stage active rod 420 through its fixed connection with the fixed shaft 110. When the cam B220 rotates, the linkage slide groove B221 thereon interacts with the linkage slide arm B450 on the two-stage active rod 420, driving the two-stage active rod 420 to rotate around the hinge point of the fixing plate 410, thereby driving the entire two-stage linkage mechanism 400 to move.

[0057] The two-stage active rod 420 and the two-stage driven rod 430 constitute a transmission chain in the two-stage connecting rod mechanism 400. They are connected by hinges to form a mechanical chain that can transmit power and motion. The two-stage active rod 420 acts as a transmitter of power, and its movement is transmitted to the derivation block 440 through the two-stage driven rod 430, thereby driving the movement of the leg support mechanism 500. One end of the two-stage active rod 420 is hinged on the fixing plate 410, and the other end is hinged with the two-stage driven rod 430. When the cam B220 rotates and pushes the two-stage active rod 420, this movement is transmitted to the derivation block 440 through the two-stage driven rod 430. The movement of the derivation block 440 pushes the upper rail plate 520 to move, thereby realizing the two-stage expansion or contraction of the leg support.

[0058] The derivation block 440 is the end component of the two-stage connecting rod mechanism 400. It is fixed to the bottom of the upper rail plate 520 and plays the role of connecting and transmitting power. The derivation block 440 ensures that the movement of the connecting rod mechanism can be accurately converted into the movement of the leg support mechanism. The derivation block 440 transmits the movement of the two-stage connecting rod mechanism 400 to the upper rail plate 520 through its connection with the two-stage follower rod 430. When the two-stage follower rod 430 moves under the drive of the cam, the derivation block 440 moves accordingly, pushing the upper rail plate 520 to perform corresponding expansion or contraction movements to achieve the adjustment of the leg support.

[0059] The linkage slide arm B450 is fixed to a side of the second-stage active rod 420 close to the cam B220, and the linkage slide arm B450 extends from a side of the second-stage active rod 420 to the linkage slide groove B221 and slides along it.

[0060] The linkage slide arm B450 is a key component in the two-stage connecting rod mechanism 400. Its function is to convert the rotational motion of the cam B220 into the linear motion of the two-stage active rod 420. This conversion is the key to achieving the two-stage motion control of the leg rest, ensuring that the leg rest can be accurately expanded and retracted. One end of the linkage slide arm B450 is fixed on the two-stage active rod 420, and the other end extends to and slides along the linkage slide groove B221. When the cam B220 rotates, the contour of the linkage slide groove B221 thereon pushes the linkage slide arm B450 to move in the slide groove. This movement is transmitted to the two-stage active rod 420 through the linkage slide arm B450, causing it to generate corresponding linear motion, thereby driving the two-stage motion of the leg rest mechanism 500.

[0061] The interaction between the linkage slide arm B450 and the linkage slide groove B221 is the core of realizing the two-stage motion control of the leg rest. This design allows precise control of the expansion and contraction of the leg rest, ensuring the smoothness and accuracy of the movement. The linkage slide arm B450 is designed to enable it to slide freely in the linkage slide groove B221 while maintaining contact with the groove. When the cam B220 rotates, the change in the profile of the linkage slide groove B221 pushes the linkage slide arm B450 to move along the designed path. This movement directly leads to the movement of the two-stage active rod 420, thereby realizing precise control of the leg rest mechanism 500. By precisely designing the profile of the linkage slide groove B221, the movement speed and distance of the leg rest can be controlled.

[0062] The balancing shaft 460 is also included, and two ends of the balancing shaft 460 are fixed on opposite sides of two adjacent two-section driven rods 430 .

[0063] The balancing shaft 460 plays a role of balancing and stabilizing in the two-stage connecting rod mechanism 400. It is fixed on the opposite sides of two adjacent two-stage driven rods 430 to ensure the balance of the connecting rod mechanism during movement, prevent the mechanism from being offset or vibrating due to uneven force, and thus improve the stability and reliability of the entire leg support system. The balancing shaft 460 forms a stable structural support through the fixed connection between its two ends and the two-stage driven rod 430. When the two-stage driven rod 430 moves under the drive of the cam, the balancing shaft 460 helps to evenly distribute the force and reduce the deformation or wear of the mechanism caused by unilateral force. In addition, the balancing shaft 460 also helps to absorb the impact force generated during the movement and protect other components from damage. When the two-stage driven rod 430 moves under the drive of the linkage slide arm B450, the balancing shaft 460 ensures the uniform transmission of force through its connection with the two-stage driven rod 430. The existence of the balance shaft 460 enables each of the two-stage driven rods 430 to maintain synchronization during movement, thereby avoiding mechanism jamming or damage caused by asynchronous movement.

[0064] A U-shaped opening (not marked in the figure) is provided on one side of the lower rail plate 510 close to the two-stage connecting rod mechanism 400, which is used to adapt the connection between the two-stage driven rod 430 and the upper rail plate 520; the two second-stage driven rods 430 of the two two-stage connecting rod mechanisms 400 are close to the opposite side near the U-shaped opening to adapt to the U-shaped opening.

[0065] The U-shaped mouth is a special design on one side of the lower rail 510 close to the two-stage connecting rod mechanism 400. Its main function is to provide movement space for the two-stage follower rod 430 so that the two-stage follower rod 430 can push the upper rail 520 to move. The design of the U-shaped mouth needs to take into account the limitations of the internal space of the leg rest while ensuring the structural strength and rationality, so it cannot be too large. The design of the U-shaped mouth allows the two-stage follower rod 430 to be smoothly inserted and connected to the lower rail 510, so that under the drive of the cam, the upper rail 520 is pushed to expand or retract accordingly through the movement of the two-stage follower rod 430. The size and shape of the U-shaped mouth are carefully designed to ensure that the two-stage follower rod 430 can be stably connected without taking up too much internal space.

[0066] How a segment movement works:

[0067] When the motor 160 is started, it drives the cam A210 and the cam B220 on the fixed shaft 110 and the connecting shaft 150 to rotate through the rotating shaft 170. The linkage slide groove A211 on the cam A210 interacts with the linkage slide arm A360 to push a section of the active rod A320 and a section of the driven rod A330 to move. This section of movement is transmitted to the lower rail 510 through the positioning plate 370, causing the leg support to begin to unfold. At the same time, a section of the active rod B340 and a section of the driven rod B350 also participate in the movement to balance the torque and ensure the smooth movement of the lower rail 510.

[0068] How two-stage motion works:

[0069] On the basis of the first stage of movement, the rotation of the cam B220 drives the second stage active rod 420 and the second stage driven rod 430 through the linkage slide arm B450. This movement is transmitted to the upper rail plate 520 through the derivation block 440 to realize the second stage of the leg support. The design of the two-stage connecting rod mechanism 400 allows the leg support to be extended additionally after the first stage of expansion to provide more leg support and comfort. The balance shaft 460 plays a stabilizing role in the second stage of movement, ensuring the synchronous movement of the two-stage driven rod 430 and avoiding the mechanism offset caused by uneven force.

[0070] Overall coordinated movement:

[0071] The overall movement of the leg rest is a combination of one-stage movement and two-stage movement. The one-stage movement allows the leg rest to be unfolded from the initial position to an intermediate position, while the two-stage movement further extends the leg rest to achieve the maximum unfolding angle. During the contraction process, these movements are reversed so that the leg rest returns smoothly to its initial position. During the whole process, the lower rail plate 510 and the upper rail plate 520 of the leg rest mechanism 500 achieve relative movement through the slide rail assembly 530 to ensure the smooth and precise control of the leg rest.

[0072] Through this design, the single-motor four-way leg rest can achieve precise four-way adjustment, providing passengers with personalized leg support and enhancing riding comfort. At the same time, since only one motor is needed to drive the entire system, this design also improves energy efficiency and reduces energy consumption.

[0073] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. Single motor four-way leg support, characterized by: It comprises a leg support mechanism (500), a drive mechanism assembly (100), and cam structures (200) respectively arranged on the output sides of both ends thereof; The cam structure (200) comprises a cam A (210) and a cam B (220) connected to each other; Two one-stage connecting rod mechanisms (300) are also provided on both sides of the driving mechanism assembly (100) and are located on the separated sides of the two cams A (210); and two two-stage connecting rod mechanisms (400) are also provided on the driving mechanism assembly (100) and are located on the opposite sides of the two cams B (220); The leg support mechanism (500) comprises a lower rail plate (510), an upper rail plate (520), and a plurality of slide rail assemblies (530) connecting opposite sides of the two; The end of the first-stage connecting rod mechanism (300) is connected to the lower rail plate (510) of the leg support mechanism (500), and the end of the second-stage connecting rod mechanism (400) is connected to the upper rail plate (520) of the leg support mechanism (500); The one-stage linkage mechanism (300) is provided with a linkage slide arm A (360) on one side close to the cam A (210), and the cam A (210) is provided with a bar-shaped linkage slide groove A (211) adapted to the linkage slide arm A (360); the two-stage linkage mechanism (400) is provided with a linkage slide arm B (450) on one side close to the cam B (220), and the cam B (220) is provided with an L-shaped linkage slide groove B (221) adapted to the linkage slide arm B (450).

2. The single-motor four-way leg support according to claim 1, characterized in that: The driving mechanism assembly (100) comprises a fixed shaft (110), a connecting shaft (150) and a motor (160); A connecting plate A (120) is symmetrically arranged on the fixed shaft (110), a concentric adjuster (130) is arranged in the connecting plate A (120), a connecting plate B (140) is fixed on the separated sides of two adjacent concentric adjusters (130), and the sides of two adjacent connecting plates B (140) away from the concentric adjusters (130) are symmetrically fixed on the connecting shaft (150), and the two ends of the connecting shaft (150) are respectively extended to be fixed to the cam A (210) and the cam B (220); The output side of the motor (160) is provided with a rotating shaft (170), and both ends of the rotating shaft (170) pass through the concentric adjuster (130) and the connecting plate B (140) and extend to be fixed to the cam A (210) and the cam B (220).

3. The single-motor four-way leg support as claimed in claim 2, characterized in that: The connection plate A (120) is provided with a limiting shaft (180), and the limiting shaft (180) extends to the top of the cam A (210) and the cam B (220).

4. The single-motor four-way leg support as claimed in claim 2, characterized in that: The one-stage connecting rod mechanism (300) comprises a guard plate (310) fixed to the end of a fixed shaft (110), an active rod A (320) being hinged on the guard plate (310), a driven rod A (330) being hinged at the end of the active rod A (320), and a positioning plate (370) being hinged at the end of the driven rod A (330); an active rod B (340) being hinged on the guard plate (310), a driven rod B (350) being hinged at the end of the active rod B (340), and the end of the driven rod B (350) being hinged on a side of the positioning plate (370) away from the driven rod A (330); the top of the positioning plate (370) is fixed to the bottom of the lower rail plate (510).

5. The single-motor four-way leg support according to claim 4, characterized in that: The linkage sliding arm A (360) is fixed to a side of a driven rod A (330) close to the cam A (210), and the linkage sliding arm A (360) extends to a side of the driven rod A (330) away from the driven rod A (330) to slide along the linkage sliding groove A (211).

6. The single-motor four-way leg support as claimed in claim 2, characterized in that: The two-stage connecting rod mechanism (400) comprises a fixing plate (410) fixed on a fixing shaft (110), the fixing plate (410) being located between a connecting plate A (120) and a cam B (220); a two-stage active rod (420) is hingedly connected at the end of the fixing plate (410), a two-stage driven rod (430) is hingedly connected at the end of the two-stage active rod (420), a guide block (440) is hingedly connected at the end of the two-stage driven rod (430), and a side of the guide block (440) away from the two-stage driven rod (430) is fixed to the bottom of the upper rail plate (520).

7. The single-motor four-way leg support according to claim 6, characterized in that: The linkage sliding arm B (450) is fixed to a side of the second-stage active rod (420) close to the cam B (220), and the linkage sliding arm B (450) extends to a side away from the second-stage active rod (420) into the linkage sliding groove B (221) and slides along it.

8. The single-motor four-way leg support according to claim 6, characterized in that: It also includes a balancing shaft (460), with two ends of the balancing shaft (460) fixed on opposite sides of two adjacent two-section driven rods (430).

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