Vehicle seat

Abstract

This disclosure discloses a vehicle seat comprising: a backrest adjuster mounted to adjust the tilt angle of a backrest frame relative to a seat cushion frame; a first entry lever mounted to release the backrest adjuster by rotating it from an initial position to an operating position using a step-in operating force; a folding lever mounted to rotate the first entry lever when rotated using a folding operating force, thereby releasing the backrest adjuster; a second entry lever rotatably mounted on the seat cushion frame such that the second entry lever is rotated by the backrest frame tilted inward by releasing the backrest adjuster, thereby unlocking a locked seat rail and limiting the inward tilt of the backrest frame; and a synchronizing operating mechanism configured to rotate the second entry lever synchronously with the folding lever, such that the second entry lever does not limit the inward tilt of the backrest frame when the folding lever is rotated to release the backrest adjuster.

Description

Technical Field

[0001] This invention relates to a technology related to the walk-in and folding functions of vehicle seats. Background Technology

[0002] Leisure vehicles (RVs) or three-door vehicles have walk-in front seats to allow occupants who wish to sit in or leave the rear seats to enter or exit the vehicle.

[0003] The "step-in" function of the vehicle seats refers to the following: In the initial state, when an occupant who wants to sit in or leave the rear seats operates the step lever or step-in switch of the front seats, the seat back tilts forward at a predetermined angle, and the front seats slide forward a predetermined distance. When the step-in function is activated, space is left between the front and rear seats to allow occupants who want to sit in or leave the rear seats to enter or exit the vehicle.

[0004] The vehicle seats also feature a folding function, distinct from the step-in function. The folding function refers to the seatback tilting forward at a greater angle than the step-in function. Typically, the seatback can tilt forward until it contacts the seat cushion. The angle of the seatback tilt is fixed by the recliner.

[0005] The relevant existing technology is KR10-2017-0056744A.

[0006] The background information provided is intended only to help understand the background of the invention and is not intended to imply that the invention falls within the scope of related technologies known to those skilled in the art. Summary of the Invention

[0007] Technical issues

[0008] The object of this invention is to provide a vehicle seat in which the folding and entry functions can be performed even when the components required to perform the seat folding and entry functions are only installed on one side of the vehicle seat. The vehicle seat can have a simple and compact construction, thereby reducing the number and weight of components, and making it easier to construct seat assemblies comprising multiple seats.

[0009] Technical solution

[0010] To achieve the above objectives, according to one aspect of the present invention, a vehicle seat is provided, the vehicle seat comprising:

[0011] A backrest adjuster is installed to adjust the tilt angle of the backrest frame relative to the seat cushion frame.

[0012] The first step lever is installed such that the backrest adjuster is released by rotating it from the initial position to the operating position using the stepping operation force.

[0013] The folding lever is installed such that the first entry lever is rotated when the folding operation force is used to rotate, and thus the backrest adjuster is released;

[0014] The second step lever is rotatably mounted on the seat cushion frame and is configured to rotate by the inward tilt of the backrest frame due to the release of the backrest adjuster, thereby unlocking the locked seat rails and limiting the inward tilt of the backrest frame; and

[0015] The in-unison operating mechanism is configured to rotate the second step lever in sync with the folding lever, such that when the folding lever is rotated to release the backrest adjuster, the second step lever does not restrict the inward tilt of the backrest frame.

[0016] In a vehicle seat, the first entry lever can be connected to the input shaft of the backrest adjuster in a manner that restricts the rotation of the first entry lever.

[0017] The folding lever can be rotatably mounted on the input shaft, so that the folding lever is concentric with the first step input lever, and

[0018] A driving-for-releasing protrusion can be provided on the folding rod in such a way that it protrudes from the folding rod toward the first entry rod, so that the driving-for-releasing protrusion can be rotated by the folding operation force, thereby rotating the first entry rod.

[0019] In the vehicle seat, the drive release protrusion can be positioned on the first entry lever in such a way that it protrudes from the first entry lever toward the folding lever, so as to stably receive the rotational displacement transmitted by the drive release protrusion.

[0020] In a vehicle seat, an entry protrusion can be positioned on the second entry lever such that it protrudes radially from the center of rotation of the second entry lever, such that the entry protrusion hooks onto a folding restraint protrusion on the backrest frame that tilts inward by releasing the backrest adjuster.

[0021] The step cable is used to unlock the seat rails when pulled; the step cable can be connected to the second step lever.

[0022] In the vehicle seat, the second step lever can be installed below the first step lever, and

[0023] The step protrusion can protrude upward from the center of rotation of the second step lever.

[0024] In a vehicle seat, the synchronization mechanism can be configured as a linkage member, the two ends of which are rotatably connected to a folding bar and a second step bar, respectively.

[0025] In the vehicle seat, one end of the linkage member can be connected to one side of the folding rod, which is opposite to the other side provided with the drive release protrusion, wherein the rotation center of the folding rod is located between the two sides of the folding rod, and

[0026] The other end of the linkage component can be connected to one side of the second step lever, which is opposite to the other side of the second step lever connected with the step cable, wherein the rotation center of the second step lever is located between the two sides of the second step lever.

[0027] In a vehicle seat, the second step lever may include:

[0028] Synchronous operating lever, connected to folding lever via synchronous operating mechanism; and

[0029] The control lever is installed concentrically with the synchronization control lever and can rotate relative to it within a predetermined range, and performs the functions of unlocking the seat rail in the locked state and limiting the inward tilt of the backrest frame.

[0030] In the vehicle seat, the range of rotation of the synchronizing lever and the operating lever relative to each other can be set to be limited by an arc-shaped adjustment groove formed in each of the synchronizing lever and the operating lever, and an adjustment pin inserted into the arc-shaped adjustment groove.

[0031] In the vehicle seat, a support spring can be installed between the synchronizing lever and the operating lever to elastically support the synchronizing lever and the operating lever in a manner that keeps their relative positions constant.

[0032] In the vehicle seat, the step-in protrusion can be positioned on the operating lever in a radial direction from the center of rotation of the operating lever, such that the step-in protrusion hooks onto a folding restraint protrusion on the backrest frame that tilts inward by releasing the backrest adjuster.

[0033] The step cable for unlocking the seat rails when they are locked can be connected at a position spaced apart from the step protrusion.

[0034] In the vehicle seat, with the rotation center of the control lever as the reference point, on the opposite side where the step cable connects to the control lever, the synchronous control lever is connected to the folding lever via a synchronous operation mechanism.

[0035] In a vehicle seat, the synchronizing mechanism can be configured as a linkage that connects the folding lever and the synchronizing lever in such a way that when the folding lever rotates in the direction of releasing the backrest adjuster, the step protrusion on the second step lever is outside the rotation radius of the folding restriction protrusion on the backrest frame, and the second step lever rotates in the opposite direction to the direction in which the step cable is pulled.

[0036] Beneficial effects

[0037] According to the present invention, the vehicle seat can perform folding and entry functions, even if the components required to perform the folding and entry functions are only installed on one side of the vehicle seat. The vehicle seat can have a simple and compact construction, thereby reducing the number and weight of components, and making it easier to construct seat assemblies including multiple seats. Attached Figure Description

[0038] Figure 1 This is a view showing the structure of a vehicle seat according to the present invention.

[0039] Figure 2 From Figure 1 A view viewed from the opposite side.

[0040] Figures 3 to 5 Showing from different angles Figure 1 The components of the present invention are applied to the seat structure, wherein the seat cushion frame and backrest frame are removed.

[0041] Figure 6 and Figure 7 Showing from different angles Figures 3 to 5 The main constituent elements of the present invention are the constituent elements of the present invention.

[0042] Figure 8 yes Figure 6 An exploded 3D diagram.

[0043] Figure 9 yes Figure 7 An exploded 3D diagram. Detailed Implementation

[0044] The specific structural and functional descriptions of the embodiments of the present invention disclosed in this specification or application are merely examples for describing embodiments of the present invention. The embodiments of the present invention can be implemented in various ways, and the present invention should not be construed as being limited to the embodiments described in this specification or application.

[0045] The embodiments of the present invention can be modified in various ways. Therefore, specific embodiments will be described in detail below with reference to the accompanying drawings. However, such specific embodiments are not intended to impose any limitation on the technical concept of the present invention. All changes, equivalents, and alternatives included within the technical concept of the present invention should be understood to fall within the scope of the present invention.

[0046] Terms such as "first" and "second" can be used to describe various constituent elements, but should not limit the meaning of these constituent elements. These terms are only used to distinguish one constituent element from another. For example, without departing from the scope of the invention, a first constituent element can be referred to as a second constituent element, and similarly, a second constituent element can be referred to as a first constituent element.

[0047] It should be understood that when a component is referred to as "connected" or "linked" to different components, it can be directly connected or directly linked to different components, or there may be other components in between. On the other hand, it should be understood that when a component is referred to as "directly connected" or "directly linked" to different components, there are no other components in between. The same applies to terms indicating the relationship between components. For example, the terms "between" and "directly between," as well as the terms "adjacent to" and "directly adjacent to," should be interpreted in the same way.

[0048] The terminology used throughout this specification is for describing particular embodiments only and is not intended to impose any limitation on the invention. Unless the context dictates otherwise, the singular form of a noun has the same meaning as when used in its plural form. It should be understood that throughout this specification, the terms "comprising," "having," or similar terms are intended to indicate the presence of features, numbers, steps, operations, constituent elements, components, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, numbers, steps, operations, constituent elements, components, or combinations thereof.

[0049] Unless otherwise defined, all terms used throughout this specification—including technical or scientific terms—have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Terms defined in common dictionaries should be understood to have the same contextual meaning as those used in the relevant technical field, and should not be construed as having an ideal or overly formal meaning unless expressly defined herein.

[0050] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings refer to the same constituent elements.

[0051] The vehicle seats are configured such that the seat back, which a user sitting on the seat cushion can lean against, can tilt relative to the seat cushion in the fore-and-aft direction. The seat back is configured such that its tilt angle can be adjusted via a backrest adjuster.

[0052] Reference Figure 1 and Figure 2 The seat cushion frame 1, which constitutes the seat cushion, and the backrest frame 3, which constitutes the seat back, are installed such that the tilt angle of the seat back can be adjusted by the backrest adjuster 5.

[0053] According to the present invention, when the vehicle seat is folded, the seat back can tilt fully inward. Furthermore, when the vehicle seat's step-in function is activated, the seat back is restricted to tilting inward only to a predetermined angle, and simultaneously, the locked seat rails are unlocked to allow the vehicle seat to slide. Moreover, these components used to distinguish between the folding and step-in functions can all be installed in a compact size on one side of the vehicle seat.

[0054] Specifically, the present invention is implemented in the portion where the backrest frame 3 can be tilted and connected to the seat cushion frame 1 via the backrest adjuster 5. (See reference...) Figures 1 to 9 According to an embodiment of the present invention, a vehicle seat is configured to include a backrest adjuster 5, a first entry lever 7, a folding lever 9, a second entry lever 11, and a synchronizing mechanism. The backrest adjuster 5 is mounted to adjust the tilt angle of the backrest frame 3 relative to the seat cushion frame 1. The first entry lever 7 is mounted to release the backrest adjuster 5 by rotating it from an initial position to an operating position using an entry operating force. The folding lever 9 is mounted to rotate the first entry lever 7 when rotated using a folding operating force, thereby releasing the backrest adjuster 5. The second entry lever 11 is rotatably mounted on the seat cushion frame 1 such that the second entry lever 11 is rotated by the backrest frame 3 tilted inward by releasing the backrest adjuster 5, thereby unlocking the locked seat rails and limiting the inward tilt of the backrest frame 3. The synchronizing mechanism is configured to rotate the second entry lever 11 synchronously with the folding lever 9, so that when the folding lever 9 is rotated to release the backrest adjuster 5, the second entry lever 11 does not limit the inward tilt of the backrest frame 3.

[0055] In other words, when the stepping force is applied to the first step lever 7, the first step lever 7 rotates, thereby releasing the backrest adjuster 5. The backrest frame 3 then tilts slightly forward due to the elastic force applied by the backrest adjuster spring 13. Then, the folding limiting protrusion 25 on the backrest frame 3 is blocked by the stepping protrusion 27 on the second step lever 11. Therefore, the tilting of the backrest frame 3 is limited.

[0056] At this point, the second entry lever 11 rotates via the backrest frame 3 to unlock the seat rails, which are in a locked state, thereby allowing the vehicle seat to move. This ensures sufficient space for occupants to enter and exit the vehicle. In other words, the rotation of the first entry lever 7 tilts the backrest frame 3 to a predetermined angle and allows the vehicle seat to slide.

[0057] When the vehicle seat is folding rather than stepping in, a folding force is applied to the folding lever 9. This causes the folding lever 9 to rotate the first step-in lever 7, releasing the backrest adjuster 5. Simultaneously, the folding lever 9 rotates the second step-in lever 11 via a synchronizing mechanism. Therefore, when the backrest frame 3 is tilted inward, the second step-in lever 11 does not restrict the inward tilt of the backrest frame 3, allowing the backrest frame 3 to tilt further inward than when in the step-in position. In other words, when the vehicle seat is folded, the second step-in lever 11 rotates at a considerable angle, ensuring that the folding restriction protrusion 25 on the backrest frame 3 is not obstructed by the step-in protrusion 27 on the second step-in lever 11. Therefore, unlike when the step-in function is being performed, the vehicle seat can be fully tilted.

[0058] The “stepping state” here refers to the state in which the backrest frame 3 is stopped from tilting by the second step lever 11 after tilting forward to a predetermined angle.

[0059] When the user operates the lever, actuator, etc., linear displacement occurs. The stepping operation force can be set to transmit this linear displacement to the first step lever 7 via the stepping operation cable 15. The folding operation force can also be set to transmit this linear displacement to the folding lever 9 via the folding operation cable 17.

[0060] According to this embodiment, the first entry lever 7 is connected to the input shaft 19 of the backrest adjuster 5 in a manner that restricts the rotation of the first entry lever 7. Conversely, the folding lever 9 is rotatably mounted to the input shaft 19, such that the folding lever 9 is concentric with the first entry lever 7. Furthermore, a drive release protrusion 21 is provided on the folding lever 9 in a manner that protrudes from the folding lever 9 toward the first entry lever 7, such that the drive release protrusion 21 can be rotated by the folding operation force, thereby rotating the first entry lever 7.

[0061] In other words, the first step lever 7 is connected to the input shaft 19 of the backrest adjuster 5 by transmitting rotational force using a spline or similar method. The first step lever 7 is configured to release the backrest adjuster 5 when rotated from the initial position to the operating position.

[0062] The initial position is when the backrest adjuster 5 is locked because no step-in force is applied to the first step lever 7. In the initial position, the angle of the backrest frame 3 relative to the seat cushion frame 1 is fixed. The operating position is when the input shaft 19 of the backrest adjuster 5 is rotated due to the application of a step-in force to the first step lever 7, thus releasing the backrest adjuster 5. In the operating position, the angle of the backrest frame 3 relative to the seat cushion frame 1 can be adjusted.

[0063] Additionally, the folding lever 9 is rotatably inserted into the input shaft 19 and is concentric with the first entry lever 7. A drive release protrusion 21 is provided on the folding lever 9. Therefore, when the folding lever 9 is rotated using the folding operation force, the drive release protrusion 21 rotates the first entry lever 7 from the initial position to the operating position. In this way, the backrest adjuster 5 is released.

[0064] The drive release protrusion 21 can be configured to protrude from the folding rod 9 so as to directly press against the lateral surface of the first entry rod 7. However, to ensure operational stability and durability, the drive release protrusion 23 can be provided on the first entry rod 7 in such a way that it protrudes from the first entry rod 7 toward the folding rod 9 to stably receive the rotational displacement transmitted by the drive release protrusion 21.

[0065] According to this embodiment, the drive release protrusion 23 is integrally formed with the first entry rod 7 in such a way that it makes surface contact with the drive release protrusion 21.

[0066] The step-in protrusion 27 is provided on the second step-in lever 11 in a radially outward direction from the rotation center of the second step-in lever 11, such that the step-in protrusion 27 hooks onto the folding restraint protrusion 25 on the backrest frame 3, which is tilted inward by releasing the backrest adjuster 5. The step-in cable 29 for unlocking the seat rails when pulled is connected to the second step-in lever 11.

[0067] The second step lever 11 is mounted below the first step lever 7, and the step protrusion 27 is configured to protrude upward from the center of rotation of the second step lever 11.

[0068] Therefore, when the backrest frame 3 tilts inward, the folding limiting protrusion 25 integrally mounted on the backrest frame 3 moves along an arcuate trajectory centered on the input shaft 19 of the backrest adjuster 5, and the step protrusion 27 on the second step lever 11 protrudes onto the arcuate trajectory of the folding limiting protrusion 25. Thus, when the backrest frame 3 tilts inward by performing the step function, the folding limiting protrusion 25 is hooked onto the step protrusion 27, thereby interrupting the inward tilting of the backrest frame 3.

[0069] Furthermore, when the inward tilting of the backrest frame 3 is interrupted as described above, the second step lever 11 rotates using the force applied to the step protrusion 27. When this operation is completed, the step cable 29 is pulled, thereby unlocking the seat rail, which is in a locked state. Thus, the vehicle seat moves via a separately provided step spring, etc., to allow the occupant to enter and exit the vehicle.

[0070] According to this embodiment, the synchronization mechanism is configured as a linkage member 31. The two ends of the linkage member 31 are respectively rotatably connected to the folding rod 9 and the second step rod 11.

[0071] The linkage member 31 is configured such that one end of it is connected to one side of the folding lever 9, which is opposite to the side of the folding lever 9 provided with the drive release protrusion 21, wherein the rotation center of the folding lever 9 is located between the two sides of the folding lever 9. Furthermore, the linkage member 31 is configured such that its other end is connected to one side of the second step lever 11, which is opposite to the side of the second step lever 11 connected with the step cable 29, wherein the rotation center of the second step lever 11 is located between the two sides of the second step lever 11.

[0072] When the folding lever 9 rotates using the folding operation force, it rotates together with the first step lever 7, thereby releasing the backrest adjuster 5. As a result, the backrest frame 3 begins to tilt inward. As the folding lever 9 rotates, the connecting rod member 31 simultaneously rotates the second step lever 11, causing the step protrusion 27 on the second step lever 11 to leave the arcuate trajectory of the folding restriction protrusion 25 of the backrest frame 3. In this way, the backrest frame 3 tilts inward more than when it is in the step-in position.

[0073] At this point, cable 29 was not pulled.

[0074] In other words, it achieves the folding function by tilting the backrest frame 3 inward in the direction of the vehicle seat.

[0075] The second step lever 11 can be configured to include a synchronization lever 33 and an operating lever 35. The synchronization lever 33 is connected to the folding lever 9 via a synchronization mechanism. The operating lever 35 is mounted concentrically with the synchronization lever 33 and is rotatable relative to it within a predetermined range, and performs the functions of unlocking the seat rails in the locked state and limiting the inward tilt of the backrest frame 3.

[0076] In other words, the second step lever 11 can be constructed as a single unit. However, according to this embodiment, as described above, the second step lever 11 is constructed to include a synchronization lever 33 and an operation lever 35 that are separate from each other.

[0077] The range in which the synchronous operating lever 33 and the operating lever 35 can rotate relative to each other can be limited by an arc-shaped adjustment groove 37 formed in each of the synchronous operating lever 33 and the operating lever 35 and an adjustment pin 39 inserted into the arc-shaped adjustment groove 37.

[0078] According to this embodiment, the adjustment groove 37 is formed in the operating lever 35, and the adjustment pin 39 is disposed on the synchronous operating lever 33. However, the adjustment groove 37 may be formed in the synchronous operating lever 33, and the adjustment pin 39 may be disposed on the operating lever 35.

[0079] A support spring 41 is installed between the synchronizing operating lever 33 and the operating lever 35. The support spring 41 elastically supports the synchronizing operating lever 33 and the operating lever 35, so that their relative positions remain constant.

[0080] Synchronous operating levers 33 and 35 are respectively configured to form the second step-in operating lever 11. They are assembled using an adjusting groove 37, an adjusting pin 39, and a support spring 41. The reason for this configuration and assembly is to easily adjust the gap between the position of the connecting folding lever 9 and the position of the connecting step-in protrusion 27 using the connecting rod component 31.

[0081] The second step lever 11 operates synchronously with the folding lever 9 via the linkage member 31. Therefore, if the position of the linkage member 31 connected to the second step lever 11 is not properly aligned with the position of the step protrusion 27, the step protrusion 27 may not fully deviate from the arcuate trajectory of the folding restraint protrusion 25 when the backrest frame 3 tilts inward by the operation of the folding lever 9. This phenomenon, which may occur due to dimensional tolerances of various components, their assembly state, etc., can be more easily prevented.

[0082] For example, the existing operating lever 35 can be replaced by an operating lever 35 with an adjustment slot 37 of different size and position. Alternatively, the existing synchronous operating lever 33 can be replaced by a synchronous operating lever 33 with an adjustment pin 39 of different position. Therefore, the gap between the position where the linkage member 31 is connected to the folding lever 9 and the position where the step protrusion is provided on the second step lever 11 changes. Therefore, the above phenomenon can be prevented when the seat back is tilted inward.

[0083] Specific embodiments of the present invention have been described and illustrated, but it will be apparent to those skilled in the art that various modifications and alterations can be made to the present invention without departing from the inventive concept defined in the claims.

[0084] Description of reference numerals in the attached figures

[0085] 1: Seat Cushion Frame

[0086] 3: Backrest frame

[0087] 5: Backrest Adjuster

[0088] 7: First step of inserting the rod

[0089] 9: Folding rod

[0090] 11: Second step lever

[0091] 13: Backrest adjuster spring

[0092] 15: Step onto the operating cable

[0093] 17: Folding operation cable

[0094] 19: Input axis

[0095] 21: Drive release protrusion

[0096] 23: Drive release protrusion

[0097] 25: Folding Restriction Protrusion

[0098] 27: Stepping into a sudden rise

[0099] 29: Step onto the cable

[0100] 31: Linkage Member

[0101] 33: Synchronization lever

[0102] 35: Control lever

[0103] 37: Adjustment groove

[0104] 39: Adjusting pin

[0105] 41: Support spring

Claims

1. A vehicle seat, comprising: A backrest adjuster is installed to adjust the tilt angle of the backrest frame relative to the seat cushion frame. The first step lever is installed such that the backrest adjuster is released by rotating it from the initial position to the operating position using a stepping action force. A folding bar is installed such that when rotated using a folding operation force, the first step bar is rotated, and thus the backrest adjuster is released; The second step lever is rotatably mounted on the seat cushion frame such that the second step lever is rotated by the backrest frame tilted inward by releasing the backrest adjuster, and thus unlocks the seat rail in the locked state and restricts the inward tilt of the backrest frame. as well as A synchronizing operating mechanism is configured such that the second step lever rotates in sync with the folding lever, so that when the folding lever rotates to release the backrest adjuster, the second step lever does not restrict the inward tilting of the backrest frame.

2. The vehicle seat according to claim 1, wherein, The first step lever is connected to the input shaft of the backrest adjuster in a manner that restricts the rotation of the first step lever. The folding rod is rotatably mounted on the input shaft such that the folding rod is concentric with the first step rod, and A drive release protrusion is disposed on the folding rod in such a manner that it protrudes from the folding rod toward the first step rod, such that the drive release protrusion can be rotated by the folding operation force, thereby rotating the first step rod.

3. The vehicle seat according to claim 2, wherein, A drive release protrusion is positioned on the first step lever in such a way that it protrudes from the first step lever toward the folding lever, so as to stably receive rotational displacement transmitted by the drive release protrusion.

4. The vehicle seat according to claim 2, wherein, The step-in protrusion is positioned on the second step-in lever in a radially extending manner from the center of rotation of the second step-in lever, such that the step-in protrusion hooks onto a folding restraint protrusion on the backrest frame, which tilts inward by releasing the backrest adjuster. A step cable is connected to the second step lever, the step cable being used to unlock the seat rails in the locked state when pulled.

5. The vehicle seat according to claim 4, wherein, The second step lever is installed below the first step lever, and The step protrusion extends upward from the rotation center of the second step lever.

6. The vehicle seat according to claim 4, wherein, The synchronous operation mechanism is configured as a linkage member, with its two ends rotatably connected to the folding rod and the second step rod, respectively.

7. The vehicle seat according to claim 6, wherein, One end of the connecting rod is connected to one side of the folding rod, and this side of the folding rod is opposite to the other side where the drive release protrusion is provided. The rotation center of the folding rod is located between the two sides of the folding rod. The other end of the connecting rod is connected to one side of the second step rod, and the side of the second step rod is opposite to the other side of the second step rod connected to the step cable. The rotation center of the second step rod is located between the two sides of the second step rod.

8. The vehicle seat according to claim 1, wherein, The second step lever includes: Synchronization lever, connected to the folding lever via the synchronization mechanism; and The operating lever is mounted concentrically with the synchronous operating lever and is rotatable relative to it within a predetermined range, and performs the functions of unlocking the seat rail in the locked state and limiting the inward tilt of the backrest frame.

9. The vehicle seat according to claim 8, wherein, The range of rotation of the synchronizing lever and the operating lever relative to each other is limited by an arc-shaped adjustment groove formed in each of the synchronizing lever and the operating lever, and an adjustment pin inserted into the arc-shaped adjustment groove.

10. The vehicle seat according to claim 9, wherein, A support spring is installed between the synchronizing lever and the operating lever, the support spring elastically supporting the synchronizing lever and the operating lever in a manner that keeps the relative positions of the synchronizing lever and the operating lever constant.

11. The vehicle seat according to claim 8, wherein, The step-in protrusion is positioned on the operating lever such that it protrudes radially from the center of rotation of the operating lever, such that the step-in protrusion hooks onto a folding restraint protrusion on the backrest frame, which tilts inward by releasing the backrest adjuster. A step cable is connected at a position spaced apart from the step protrusion, the step cable being used to unlock the seat rails in the locked state.

12. The vehicle seat according to claim 11, wherein, With the rotation center of the operating lever as the reference point, on the opposite side where the step cable is connected to the operating lever, the synchronous operating lever is connected to the folding lever through the synchronous operating mechanism.

13. The vehicle seat according to claim 12, wherein, The synchronizing lever is configured as a linkage member connecting the folding lever and the synchronizing lever, such that when the folding lever rotates in the direction of releasing the backrest adjuster, the step protrusion on the second step lever is outside the rotation radius of the folding restriction protrusion on the backrest frame, and the second step lever rotates in the opposite direction to the direction in which the step cable is pulled.

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