Seat assembly, cab and vehicle

Abstract

The utility model discloses a seat assembly, cab and vehicle, seat assembly includes: main vertical board, first cushion, first cushion extends in front -back direction and rear end with main vertical board downward rotatablely connected, second cushion, second cushion extends in up -and -down direction and is located first cushion's back side, and the lower extreme of second cushion is rotatablely connected with main vertical board, one of second cushion and main vertical board is provided with limit groove, and the other is provided with limit rod, and limit rod slidablely extends into limit groove and with limit groove selectively limit, to limit the rotation angle of second cushion. Therefore, by setting limit groove and limit rod selective limit cooperation, can limit the angle of second cushion in seat assembly, like this not only can simplify seat assembly's structure, and in the limited space of seat assembly, can also guarantee the structure stability of second cushion, and limit reliable, to be applicable to more car type.

Description

Technical Field

[0001] This utility model relates to the field of vehicle technology, and in particular to a seat assembly, a driver's cab, and a vehicle. Background Technology

[0002] The driver's seat in an industrial vehicle should allow the operator to operate the vehicle in different ways, such as standing, leaning, or sitting. To save space, foldable seats are now commonly used.

[0003] In the existing technology, the folding limit structure of folding adjustable seats is relatively complex and has low applicability to other vehicle models. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a seat assembly that is simple and stable in structure and reliable in function.

[0005] This utility model further proposes a driver's cab.

[0006] This utility model further proposes a vehicle.

[0007] A seat assembly according to an embodiment of the present invention includes: a main upright plate; a first seat cushion extending in a front-to-back direction and having its rear end rotatably connected to the main upright plate downwards; a second seat cushion extending in a vertical direction and located behind the first seat cushion, the lower end of the second seat cushion being rotatably connected to the main upright plate forwards; one of the second seat cushion and the main upright plate is provided with a limiting groove, and the other is provided with a limiting rod, the limiting rod being slidably inserted into the limiting groove and selectively limiting the limiting groove to restrict the rotation angle of the second seat cushion.

[0008] Therefore, by setting a limiting groove and a limiting rod to selectively limit the engagement, the angle of the second seat cushion in the seat assembly can be restricted. This not only simplifies the structure of the seat assembly, but also makes the structure of the second seat cushion stable and the limiting reliable within the limited space of the seat assembly, so that it can be used in more car models.

[0009] According to some embodiments of the present invention, a rotation limiting plate is provided at the lower end of the second seat cushion, the limiting groove is provided on the rotation limiting plate, and the limiting rod is provided on the main upright plate.

[0010] According to some embodiments of the present invention, a rotating hole is provided on the rotating limiting plate, the rotating hole is rotatably connected to the first rotating shaft on the main upright plate, the limiting groove is arc-shaped, the limiting groove is located on the rear side of the rotating hole, and the center of the circle in which the arc-shaped limiting groove is located coincides with the center of the rotating hole.

[0011] According to some embodiments of the present invention, the first seat cushion is rotatably connected to the limiting rod. When the first seat cushion selectively rotates downward relative to the limiting rod to extend in the vertical direction, the second seat cushion can rotate relative to the first pivot to extend in the front-back direction.

[0012] According to some embodiments of the present invention, the lower end of the second cushion is formed with an arc-shaped relief portion, which is adapted to avoid the rotation of the first cushion.

[0013] According to some embodiments of the present invention, a locking rod is connected between the first seat cushion and the main upright plate. The first end of the locking rod in the length direction is rotatably connected to the first seat cushion, and the second end of the locking rod in the length direction is selectively locked to the main upright plate.

[0014] According to some embodiments of the present invention, the locking rod has a curved groove and a straight groove. The straight groove extends in the length direction of the locking rod, and the curved groove is located at the second end in the length direction of the locking rod and communicates with the straight groove. A locking member is provided on the main upright plate. The locking member selectively abuts against the curved groove to lock, or selectively slides in the straight groove.

[0015] According to some embodiments of the present invention, an unlocking lever is provided under the first seat cushion, the front end of the unlocking lever is provided with a handle, and the rear end of the unlocking lever is connected to the first end of the locking lever, so as to selectively pull the locking lever to unlock it from the locking member shown.

[0016] According to some embodiments of the present invention, the seat assembly further includes a height-adjusting gas spring and a height-adjusting handle. The height-adjusting handle is disposed on the upper side of the height-adjusting gas spring and is in surface contact with the height-adjusting gas spring. The height-adjusting handle selectively drives the height-adjusting gas spring to rise and fall. The main upright plate is connected to the height-adjusting gas spring to selectively follow the rise and fall of the height-adjusting gas spring.

[0017] The cab according to this utility model includes the seat assembly described above.

[0018] The vehicle according to this utility model includes the driver's cab described above.

[0019] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a partial schematic diagram of a vehicle according to an embodiment of the present utility model; Figure 2 This is a partial schematic diagram of a vehicle from another perspective according to an embodiment of the present utility model; Figure 3 This is a schematic diagram of a seat assembly according to an embodiment of the present utility model; Figure 4 This is a cross-sectional view of a seat assembly according to an embodiment of the present utility model.

[0021] Figure label: 1000, Vehicle; 200, Pad; 300, Vertical Handle; 400, First-Level Pedal; 500, Second-Level Pedal; 600, Cab; 100. Seat components; 10. Main upright plate; 11. Limiting rod; 12. First pivot; 13. Locking component; 14. Guide groove; 15. Guide block; 20. First seat cushion; 21. Unlocking lever; 211. Handle; 212. Connecting component; 22. Second pivot; 30. Second seat cushion; 31. Rotating limit plate; 311. Limiting groove; 312. Rotating hole; 32. Arc-shaped clearance part; 40. Locking rod; 41. First end; 42. Second end; 44. Straight groove; 50. Height-adjustable gas spring; 60. Height-adjustable handle; 70. Backrest body; 80. Connecting block; 81. Fastening bolt. Detailed Implementation

[0022] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present invention are described in detail below.

[0023] The following is for reference. Figures 1-4 The present invention describes a seat assembly 100 according to an embodiment of the present invention, which is adapted to a cab 600 and a vehicle 1000.

[0024] Combination Figure 3 and Figure 4 As shown, the seat assembly 100 according to an embodiment of the present utility model may mainly include: a main upright plate 10, a first seat cushion 20 and a second seat cushion 30, wherein the first seat cushion 20 extends in the front-rear direction and its rear end is rotatably connected to the main upright plate 10 downwards, the second seat cushion 30 extends in the vertical direction and is located behind the first seat cushion 20, and the lower end of the second seat cushion 30 is rotatably connected to the main upright plate 10 forwards.

[0025] Specifically, the first seat cushion 20 extends forward and backward, allowing the driver to work while seated on it. The second seat cushion 30 extends vertically, and both the first seat cushion 20 and the second seat cushion 30 are connected to the main upright plate 10. This provides lumbar support for the driver when seated on the first seat cushion 20, thereby improving riding comfort.

[0026] Furthermore, the first seat cushion 20 can rotate downward relative to the main upright plate 10, and the second seat cushion 30 can rotate forward relative to the main upright plate 10. In this way, when the driver is standing in the cab 600, the first seat cushion 20 can be rotated downward relative to the main upright plate 10 to be used as a backrest. Or, when the driver wants to lean back on the seat assembly 100, the second seat cushion 30 can be rotated forward relative to the main upright plate 10 to adjust the angle of the second seat cushion 30, so that the driver can sit diagonally and lean against the backrest. In this way, the seat assembly 100 of this utility model allows the driver to realize multiple driving modes and switch freely to improve the driver's comfort when working in the cab 600.

[0027] Furthermore, one of the second seat cushion 30 and the main upright plate 10 is provided with a limiting groove 311, and the other is provided with a limiting rod 11. The limiting rod 11 can slide into the limiting groove 311 and selectively limits the movement of the second seat cushion 30. Specifically, the limiting rod 11 and the limiting groove 311 have simple structures, which can simplify the limiting structure between the second seat cushion 30 and the main upright plate 10. The contact area between the limiting rod 11 and the limiting groove 311 is large, so that the limiting between the second seat cushion 30 and the main upright plate 10 can be reliably limited at any time.

[0028] With this configuration, within the limited space of the seat assembly 100, the limiting rod 11 and the limiting groove 311 can ensure the structural stability of the second seat cushion 30 when it extends vertically, and limit the angle of the second seat cushion 30 after it rotates forward, so as to ensure that the second seat cushion 30 provides stable support for the driver when sitting at an angle in the cab 600. This configuration not only ensures the comfort and safety of the driver working in the cab 600, but also simplifies the structure of the seat assembly 100, and only requires rotating the second seat cushion 30 to provide support for the driver in different driving modes, making operation convenient.

[0029] Combination Figure 4As shown, a rotation limiting plate 31 is provided at the lower end of the second cushion 30, and a limiting groove 311 is formed on the rotation limiting plate 31. A limiting rod 11 is provided on the main upright plate 10. Specifically, the rotation limiting plate 31 is integrally formed with the second cushion 30 so that the limiting plate and the second cushion 30 can rotate together relative to the main upright plate 10. The rotation limiting plate 31 provides space for the opening of the limiting groove 311, which makes the structure of the limiting groove 311 stable and reliable. The limiting rod 11 is set on the main upright plate 10, which ensures the reliable cooperation between the limiting rod 11 and the limiting groove 311, and thus ensures the positional reliability of the second cushion 30.

[0030] Combination Figure 4 As shown, the rotating limiting plate 31 has a rotating hole 312, which is rotatably connected to the first rotating shaft 12 on the main upright plate 10. In this way, the rotating limiting plate 31 can rotate around the axis of the first rotating shaft 12 as the rotation center. This allows the second seat cushion 30 to rotate forward around the first rotating shaft 12 when it rotates relative to the main upright plate 10, thereby realizing the angle adjustment of the second seat cushion 30.

[0031] Furthermore, the limiting groove 311 is arc-shaped and located behind the rotating hole 312. The center of the circle containing the arc-shaped limiting groove 311 coincides with the center of the rotating hole 312. This arrangement not only ensures that the limiting groove 311 and the rotating hole 312 are spaced apart and independently arranged on the rotating limiting plate 31, thus guaranteeing the structural reliability of the limiting groove 311 and the rotating hole 312, but also makes the structure of the limiting groove 311 and the rotating hole 312 on the rotating limiting plate 31 more... In addition to being compact, the center of the circle containing the limiting groove 311 coincides with the center of the rotating hole 312. Thus, when the rotating limiting plate 31 rotates around the first rotating shaft 12, the limiting groove 311 also rotates around the first rotating shaft 12. In this way, when the second seat cushion 30 rotates forward, it can be ensured that the limiting rod 11 is still in the limiting groove 311, so as to prevent the limiting groove 311 from getting stuck with the limiting rod 11 when rotating, thereby ensuring the smooth rotation of the second seat cushion 30.

[0032] Combination Figure 1 As shown, the first seat cushion 20 is rotatably connected to the limiting rod 11. When the first seat cushion 20 selectively rotates downward relative to the limiting rod 11 to extend in the vertical direction, the second seat cushion 30 can rotate relative to the first rotating shaft 12 to extend in the front-back direction. Specifically, in the embodiment of this utility model, the downward rotation of the first seat cushion 20 can be changed from the first seat cushion 20 extending in the front-back direction to the first seat cushion 20 extending in the vertical direction. In this way, the rotatable angle of the first seat cushion 20 is 90°, that is, the central angle corresponding to the limiting groove 311 is 90°.

[0033] Furthermore, the process of the second seat cushion 30 rotating forward can be changed from the second seat cushion 30 extending and rotating in the vertical direction to the second seat cushion 30 extending in the front and back direction. When the second seat cushion 30 extends in the vertical direction, it can support the lower back of the person. When the second seat cushion 30 extends in the front and back direction, it can support the buttocks of the worker, so as to achieve the comfort of the worker when the seat assembly 100 is used in different ways.

[0034] With this configuration, when the first seat cushion 20 rotates downwards, it can prevent the second seat cushion 30 from rotating forwards, thus enabling workers to perform various work methods within the limited space of the seat assembly 100.

[0035] Combination Figure 4 As shown, the lower end of the second cushion 30 has an arc-shaped relief portion 32, which is adapted to avoid the rotation of the first cushion 20. Specifically, when the first cushion 20 extends in the front-back direction, the second cushion 30 extends in the vertical direction. At this time, the rear end of the first left end is close to the lower end of the second cushion 30. In order to prevent the first cushion 20 from interfering with the second cushion 30 during downward rotation, the lower end of the second cushion 30 is provided with an arc-shaped relief portion 32 to avoid the rotation of the first cushion 20. This can prevent the first cushion 20 from interfering with the second cushion 30 when it rotates downward. This arrangement can ensure the smooth rotation of the first cushion 20.

[0036] Combination Figure 3 and Figure 4 As shown, a locking rod 40 is connected between the first seat cushion 20 and the main upright plate 10. Specifically, the locking rod 40 is supported between the first seat cushion 20 and the main upright plate 10, and is used to lock the state of the first seat cushion 20 when it extends back and forth, so as to ensure the structural stability of the first seat cushion 20 when it extends in the back and forth direction.

[0037] Furthermore, the first end 41 of the locking rod 40 along its length is rotatably connected to the first seat cushion 20, and the second end 42 of the locking rod 40 along its length is selectively locked to the main upright plate 10. In this way, when the first seat cushion 20 rotates relative to the locking rod 40, the locking rod 40 can be driven to selectively lock to the main upright plate 10. This configuration not only restricts the position of the first seat cushion 20, but also allows the first seat cushion 20 to be unlocked by rotating it, thereby changing the position of the first seat cushion 20.

[0038] Combination Figure 3 and Figure 4As shown, the locking rod 40 has a curved groove and a straight groove 44. The straight groove 44 extends along the length of the locking rod 40. The curved groove is located at the second end 42 along the length of the locking rod 40 and is connected to the straight groove 44. A locking member 13 is provided on the main plate 10. The locking member 13 can selectively abut against the curved groove for locking, or selectively slide in the straight groove 44.

[0039] Specifically, when the first seat cushion 20 extends in the front-to-back direction, the locking member 13 abuts against the curved groove on the locking rod 40 and locks it in place. The curved groove is partially bent, and the wall of the curved groove in the bent part can abut against the locking member 13 to achieve the locking engagement between the locking member 13 and the locking rod 40. This can limit the first seat cushion 20 to the position where it extends in the front-to-back direction, so as to ensure the structural stability of the first seat cushion 20.

[0040] Furthermore, the first seat cushion 20 is rotated downward relative to the main upright plate 10 to drive the locking lever 40 to rotate. This allows the locking member 13 to slide into the straight track groove 44, and the locking member 13 to slide along the length of the straight track groove in the straight track groove 44 until the first seat cushion 20 is completely lowered. This allows the first seat cushion 20 to be folded so that the driver can achieve other driving modes in the cab 600, or use it as a backrest for the driver when the driver is standing, so as to provide reliable support for the driver.

[0041] Furthermore, when the first seat cushion 20 is lifted upward, the locking rod 40 slides in the straight groove 44 until the first seat cushion 20 is rotated to extend in the front-back direction. At this point, the locking rod 40 slides into the curved groove and engages with the curved groove to lock the first seat cushion 20 back to the front-back extension position. This configuration allows the first seat cushion 20 to be folded.

[0042] Combination Figure 3 and Figure 4 As shown, the first end 41 of the locking rod 40 is connected to the second pivot 22 below the first seat cushion 20. An unlocking lever 21 is provided below the first seat cushion 20. The front end of the unlocking lever 21 is provided with a handle 211 and the rear end is connected to the second pivot 22. The unlocking lever 21 selectively pulls the second pivot 22 to rotate, thereby unlocking the locking rod 40 from the locking member 13.

[0043] Specifically, an unlocking lever 21 is provided below the first seat cushion 20. A handle 211 is provided at the front end of the unlocking lever 21, and the rear end of the unlocking lever 21 is connected to the first end 41 of the locking lever 40 to selectively pull the locking lever 40 to unlock the locking member 13. Specifically, the unlocking lever 21 is located below the first seat cushion 20 and extends in the front-rear direction. This allows one end of the unlocking lever to extend out of the front of the first seat cushion 20 so that the driver can pull the unlocking lever 21 by hand. The other end can extend rearward and be connected to the first end 41 of the locking lever 40. Thus, when the driver pulls the front end of the unlocking lever 21, the unlocking lever 21 can drive the first end 41 of the locking lever 40 to rotate, causing the locking member 13 to slide from the curved groove into the straight groove 44, thereby unlocking the locking lever 40 and the locking member 13, so that the first seat cushion 20 rotates downward relative to the main upright plate 10.

[0044] In an embodiment of this utility model, a linear spring is connected between the rear end of the unlocking lever 21 and the first seat cushion 20. When there is no external force on the unlocking lever 21, the linear spring is in a balanced state or in a stretched state. When the unlocking lever 21 is pulled forward, the linear spring is stretched or continues to be stretched. After the external force on the unlocking lever 21 disappears, the elastic force of the linear spring can pull the unlocking lever 21 back so that the unlocking lever 21 is reset.

[0045] Furthermore, a second pivot 22 is provided below the first seat cushion 20, meaning the first seat cushion 20 can rotate around the first pivot 11. The first end 41 of the locking rod 40 is connected to the second pivot 22, meaning the first end 41 of the locking rod 40 can rotate around the second pivot 22. The rear end of the unlocking lever 21 is provided with a rotatable connector 212, which is connected to the second rotating shaft 22. The rotatable connector 212 can rotate around the second rotating shaft 22. With this configuration, when the unlocking lever 21 is pulled forward, the end of the connector 212 that is rotatably connected to the rear end of the unlocking lever 21 can rotate around the second rotating shaft 22, and the second rotating shaft 22 has a tendency to move forward. At the same time, the locking member 13 unlocks from the curve groove and slides into the straight groove 44. At this time, the first seat cushion 20 can rotate around the first rotating shaft 11, so that the first seat cushion 20 rotates downward relative to the main upright plate 10, thereby allowing the first seat cushion 20 to fold, so as to prevent the driver from achieving other driving modes in the cab 600.

[0046] In this embodiment of the invention, a one-way rotation structure is designed between the second rotating shaft 22 and the locking rod 40, allowing the second rotating shaft 22 and the locking rod 40 to rotate clockwise relative to each other, while locking in the opposite direction. The internal iron plate of the secondary seat cushion rotates via the rotating shaft and is limited by the rotating shaft.

[0047] Combination Figure 3 and Figure 4As shown, the seat assembly 100 also includes a height-adjusting gas spring 50 and a height-adjusting handle 60. The height-adjusting handle 60 is disposed on the upper side of the height-adjusting gas spring 50 and is in surface contact with the height-adjusting gas spring 50. The height-adjusting handle 60 selectively drives the height-adjusting gas spring 50 to rise and fall. The main upright plate 10 is connected to the height-adjusting gas spring 50 so as to selectively follow the rise and fall of the height-adjusting gas spring 50.

[0048] Specifically, the height adjustment handle 60 is connected to the main upright plate 10 by bolt hinges, and the height adjustment gas spring 50 is fixed on the main upright plate 10. The height adjustment handle 60 and the height adjustment gas spring 50 are in surface contact, which increases the contact area between the height adjustment handle 60 and the height adjustment gas spring 50. When the height adjustment handle 60 is pulled, the height adjustment gas spring 50 can be easily driven to rise and fall, which in turn can drive the main upright plate 10 to rise and fall. The main upright plate 10 can drive the first seat cushion 20 and the second seat cushion 30 to rise and fall together, thereby realizing the height adjustment of the seat assembly 100 to accommodate drivers of different heights working in the cab 600.

[0049] Furthermore, the height-adjustable gas spring 50 is designed to handle a load of 150kg, making it widely adaptable to different groups of people.

[0050] In the embodiments of this utility model, combined with Figure 3 and Figure 4 As shown, the seat assembly 100 also includes a backrest body 70, which is connected to the main upright plate 10 via a limiting rod 11. The backrest body 70 can provide support for the driver's back in the cab 600 to ensure the driver's stability and comfort in the cab 600.

[0051] According to the embodiments of this utility model, in conjunction with Figures 1-4 As shown, the seat assembly 100 can be configured in the cab 600. The cab 600 configured with the seat assembly 100 in this embodiment of the present invention can enable the driver to realize multiple driving modes in the cab 600 to adapt to different groups or different driving habits of the driver.

[0052] In the embodiments of this utility model, combined with Figure 1 and Figure 2 As shown, the cab 600 also includes a protective pad 200 to protect the driver while working in the cab 600. Unlike the prior art, the protective pad 200 and the seat assembly 100 of this utility model are set separately, making it widely adaptable to different groups.

[0053] In the embodiments of this utility model, combined with Figure 1 and Figure 2 As shown, the cab 600 also includes a vertical handle 300 for the driver's convenience.

[0054] In the embodiments of this utility model, combined with Figures 1-4 As shown, the cab 600 also includes a primary pedal 400 and a secondary pedal 500. The primary pedal 400 and the secondary pedal 500 form a height difference in the vertical direction, and the primary pedal 400 and the secondary pedal 500 are equipped with the same sensor switch. With this configuration, the driver can drive by using the primary pedal 400 or the secondary pedal 500 when sitting on the first seat cushion 20, standing in the cab 600, or sitting diagonally on the seat assembly 100. This makes the cab 600 widely adaptable to different groups of people.

[0055] In the embodiments of this utility model, combined with Figure 3 As shown, guide grooves 14 are provided on both the left and right sides of the main upright plate 10. Guide blocks 15 are provided in the guide grooves 14. Connecting blocks 80 are provided on the inner wall of the driver's cab. Fastening bolts 81 are provided on the connecting blocks 80. The fastening bolts 81 can selectively fasten the connecting blocks 80 and the guide blocks 15. The guide blocks 15 are cylindrical and have a simple structure.

[0056] In this way, by loosening the fastening bolt 81, the main upright plate 10 can be raised and lowered. At this time, the guide block 15 can slide along the guide groove 14 in the guide groove 14, and the sliding resistance between the cylindrical surface of the guide block 15 and the guide groove 14 is small, so that the sliding of the guide block 15 in the guide groove 14 is smoother.

[0057] When the main upright plate 10 is adjusted to the appropriate position, the fastening bolt 81 can be tightened to secure the guide block 15 to the connecting block 80. This can fix the position of the main upright plate 10 in the cab, ensuring that the seat assembly 100 is reliably installed in the cab and that the driver can sit and lean on the seat assembly 100 reliably.

[0058] According to embodiments of the present invention, in conjunction with Figures 1-4 As shown, the cab 600 equipped with the seat assembly 100 of this utility model is applicable to the vehicle 1000. The seat assembly 100 of this utility model has a simple structure, and the second seat cushion 30 and the main upright plate 10 are reliably positioned, making it applicable to different vehicle models.

[0059] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "circumferential", "radial", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0060] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0061] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A seat assembly, characterized in that, include: Main support plate (10); The first seat cushion (20) extends in the front-to-back direction and its rear end is rotatably connected to the main upright plate (10); The second cushion (30) extends in the vertical direction and is located behind the first cushion (20). The lower end of the second cushion (30) is rotatably connected to the main upright plate (10). One of the second cushion (30) and the main upright plate (10) is provided with a limiting groove (311), and the other is provided with a limiting rod (11). The limiting rod (11) can slide into the limiting groove (311) and selectively limit the limiting groove (311) to restrict the rotation angle of the second cushion (30).

2. The seat assembly according to claim 1, characterized in that, The lower end of the second cushion (30) is provided with a rotation limiting plate (31), the rotation limiting plate (31) is provided with the limiting groove (311), and the main upright plate (10) is provided with the limiting rod (11).

3. The seat assembly according to claim 2, characterized in that, The rotating limiting plate (31) has a rotating hole (312) which is rotatably connected to the first rotating shaft (12) on the main upright plate (10). The limiting groove (311) is arc-shaped and located behind the rotating hole (312). The center of the circle containing the arc-shaped limiting groove (311) coincides with the center of the rotating hole (312).

4. The seat assembly according to claim 2, characterized in that, The first seat cushion (20) is rotatably connected to the limiting rod (11). When the first seat cushion (20) is selectively rotated downward relative to the limiting rod (11) to extend in the vertical direction, the second seat cushion (30) can be rotated relative to the first pivot (12) to extend in the front-back direction.

5. The seat assembly according to claim 1, characterized in that, The lower end of the second cushion (30) is formed with an arc-shaped relief portion (32), which is adapted to avoid the rotation of the first cushion (20).

6. The seat assembly according to claim 1, characterized in that, A locking rod (40) is connected between the first seat cushion (20) and the main upright plate (10). The first end (41) of the locking rod (40) in the length direction is rotatably connected to the first seat cushion (20), and the second end (42) of the locking rod (40) in the length direction is selectively locked to the main upright plate (10).

7. The seat assembly according to claim 6, characterized in that, The locking rod (40) has a curved groove and a straight groove (44). The straight groove (44) extends along the length of the locking rod (40). The curved groove is located at the second end (42) along the length of the locking rod (40) and is connected to the straight groove (44). The main plate (10) is provided with a locking member (13). The locking member (13) selectively abuts against the curved groove to lock, or selectively slides in the straight groove (44).

8. The seat assembly according to any one of claims 1-7, characterized in that, It also includes a height-adjusting gas spring (50) and a height-adjusting handle (60). The height-adjusting handle (60) is located on the upper side of the height-adjusting gas spring (50) and is in contact with the surface of the height-adjusting gas spring (50). The height-adjusting handle (60) selectively drives the height-adjusting gas spring (50) to rise and fall. The main upright plate (10) is connected to the height-adjusting gas spring (50) to selectively follow the rise and fall of the height-adjusting gas spring (50).

9. A driver's cab, characterized in that, Includes the seat assembly (100) according to any one of claims 1-8.

10. A vehicle, characterized in that, include: The driver's cab (600) as described in claim 9.

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