A multifunctional seat chassis

Abstract

This case relates to a multifunctional seat chassis, including a base, a backrest connecting seat hinged to one end of the base, and a base linkage seat hinged to the other end of the base. A seat connecting seat, capable of linkage with the base, backrest connecting seat, and base linkage seat, is connected to the upper end of the base. The seat chassis also includes a backrest adjustment mechanism for adjusting the tilt angle of the backrest connecting seat relative to the base, a height adjustment mechanism for adjusting the seat's height, a position adjustment mechanism for adjusting the fore-and-aft position of the seat connecting seat, and a tilt adjustment mechanism for adjusting the seat's forward tilt. The seat chassis provided in this case integrates four major functions: backrest angle adjustment, height adjustment, fore-and-aft position adjustment, and tilt adjustment, achieving multifunctional adjustment and better meeting the needs of a more ergonomic market. Through the linkage design of the seat connecting seat with the base, backrest connecting seat, and base linkage seat, the various functions can operate collaboratively yet independently during adjustment.

Description

Technical Field

[0001] This utility model relates to the field of seat accessories, specifically to a multifunctional seat chassis. Background Technology

[0002] With the development of the office and home furnishing industries, chairs, as frequently used furniture, are facing increasing demands for comfort and functionality. The chair chassis, as the core component of the chair, undertakes crucial functions such as support and adjustment, directly impacting the user experience.

[0003] In existing technologies, seat chassis often have relatively simple functions, such as only backrest angle adjustment or height adjustment, or both. However, this still fails to meet the diverse needs of users in different scenarios. Under these circumstances, while existing seat chassis that combine backrest and height adjustment integrate two adjustment functions, they suffer from problems such as complex structure, poor interoperability of the adjustment mechanisms, laborious operation, and mutual interference. For example, adjusting the backrest angle may cause the seat position to shift; height adjustment may lack stability; or fore-and-aft adjustment and tilting functions cannot be operated independently, seriously affecting user convenience and the overall reliability of the seat.

[0004] Therefore, overcoming the aforementioned shortcomings has become an important issue that urgently needs to be addressed by those skilled in the art. Utility Model Content

[0005] This utility model overcomes the shortcomings of the above-mentioned technology and provides a multi-functional seat chassis.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A multifunctional seat chassis includes a base, a backrest connecting seat hinged to one end of the base, and a base linkage seat hinged to the other end of the base. The upper end of the base is connected to a seat connecting seat that can be linked with the base, the backrest connecting seat, and the base linkage seat. The seat chassis also includes a backrest adjustment mechanism for adjusting the tilt angle of the backrest connecting seat relative to the base, a lifting adjustment mechanism for adjusting the height of the seat, a position adjustment mechanism for adjusting the fore-and-aft position of the seat connecting seat, and a tilt adjustment mechanism for adjusting the forward tilt function of the seat.

[0007] Furthermore, the seat connecting seat includes a linkage plate disposed on both sides of the base, a first connecting seat fixedly connected to the linkage plate, and a seat connecting base connected to the upper end of the first connecting seat. One end of the linkage plate is hinged to the base and the backrest connecting seat via a pivot, and the other end is hinged to the base linkage seat and can move with the movement of the three.

[0008] Furthermore, the backrest adjustment mechanism includes a support shaft connected between the base and the backrest connecting seat and acting as a fulcrum, a backrest adjustment handle located on the outside of the base, a paddle located inside the base, and a gear plate for locking in cooperation with the paddle. The gear plate is fixedly connected to the side of the backrest connecting seat that extends into the base.

[0009] Furthermore, the paddle is hinged to the base via a connecting shaft, and the end of the backrest adjustment handle that passes through the base is provided with a first paddle block that can rotate synchronously with the rotation of the backrest adjustment handle. The gear plate is provided with at least two gear teeth, and a pressure plate is connected to the upper end of the paddle.

[0010] Furthermore, the lifting adjustment mechanism includes a mounting hole on the base for connecting to the gas spring of the seat, a cylinder switch on the mounting hole for controlling the operation of the cylinder of the swivel chair, an L-shaped lifting motion rod hinged to the base for controlling the operation of the cylinder switch, and a lifting adjustment handle on the outside of the base for driving the lifting motion rod. The end of the lifting adjustment handle that passes through the base is provided with a second lever for driving the lifting motion rod. The second lever can rotate synchronously with the rotation of the lifting adjustment handle.

[0011] Furthermore, the seat connecting base is slidably connected to the top of the first connecting seat. The position adjustment mechanism includes at least two locking holes arranged equidistantly on the seat connecting base, a first spring connected between the seat connecting base and the first connecting seat, a transmission rod connected to the outside of one of the linkage plates, a locking strip that can swing and engage / disengage from the locking holes as the transmission rod moves, a second spring that resets the transmission rod, and a sleeve connected to one end of the transmission rod for driving the transmission rod to move. The sleeve is rotatably connected to the backrest adjustment handle or the height adjustment handle.

[0012] Furthermore, the forward tilt adjustment mechanism includes an adjustment crossbar that passes laterally through the two end linkage plates and the base. The adjustment crossbar is connected to the linkage plates through a drive mechanism that is respectively connected to the linkage plates on both sides, thereby driving the linkage plates to move. The first connecting seat includes a horizontal plate that is disposed on both sides and adapted to the linkage plates. The horizontal plate is connected between the drive mechanism and the linkage plates.

[0013] Furthermore, the driving mechanism includes a driving block connected to the adjusting crossbar and rotatable with the adjusting crossbar, and a base fixedly connected to the crossbar, wherein a limiting groove is provided in the base for the driving block to rotate therein.

[0014] Furthermore, one end of the base linkage seat is hinged to the base via a first central axis, and the other end is hinged to the linkage plate via a second central axis. A torsion spring is sleeved on the first central axis, with one end of the torsion spring abutting against the inner wall surface of the base linkage seat and the other end extending into the base and abutting against the inner wall surface of the base.

[0015] Compared with the prior art, the beneficial effects of this utility model are: The seat chassis provided in this design integrates four main functions: backrest angle adjustment, height adjustment, fore-and-aft position adjustment, and tilt adjustment, achieving multi-functional adjustment and better meeting the market demand for user-friendly features. Through the interconnected design of the seat connecting base, backrest connecting base, and base linkage, each function operates independently while maintaining coordination during adjustment, resulting in better adjustment performance, improved linkage, and greater convenience and effortlessness. This eliminates the need for multiple independent chassis; each adjustment mechanism is designed independently and operated via corresponding handles or components, ensuring that the adjustment process does not interfere with each other. This design increases the multi-functionality of the seat chassis while maintaining the simplicity of the overall structure, meeting the user's needs in various scenarios such as office work and rest. Attached Figure Description

[0016] Figure 1 This is a 3D view of the seat chassis in this case.

[0017] Figure 2 This is a partial structural disassembly diagram of the seat chassis in this case.

[0018] Figure 3 This is a schematic diagram of the internal structure of the seat chassis in this case.

[0019] Figure 4 This is the case Figure 3 A magnified view of part A in the middle.

[0020] Figure 5 This is a schematic diagram of the paddle shifter and gear shifter locked in the same position in this case. Detailed Implementation

[0021] The following examples provide a more detailed description of the features and other related characteristics of this utility model, to facilitate understanding by those skilled in the art: like Figures 1 to 5As shown, this invention provides a multifunctional seat chassis, including a base 1, a backrest connecting seat 2 hinged to one end of the base 1, and a base linkage seat 3 hinged to the other end of the base 1. In specific implementation, the base 1 supports the entire seat chassis and connects to the support legs at the bottom of the seat; existing seat support legs are generally roller-type support legs. The backrest connecting seat 2 connects to the seat back and can rotate around its hinge point with the base 1 to adjust the backrest angle. The base linkage seat 3 and the backrest connecting seat 2 together support the base 1, improving overall stability. Through the cooperation of the base linkage seat 3 and the backrest connecting seat 2, they jointly support the base 1, allowing it to withstand greater weight and meet more user needs. A seat connecting seat 4, which can be linked with the base 1, the backrest connecting seat 2, and the base linkage seat 3, is connected to the upper end of the base 1. In practical implementation, the seat connecting seat 4 is used to connect the chair seat, that is, to connect the seat plate. When the backrest connecting seat 2 or the base linkage seat 3 rotates, the seat connecting seat 4 can synchronously change its angle, providing support for the chair seat and ensuring good stability. The seat chassis of this application also includes a backrest adjustment mechanism 6 for adjusting the tilt angle of the backrest connecting seat 2 relative to the base 1, a lifting adjustment mechanism 7 for adjusting the height function of the seat, a position adjustment mechanism 8 for adjusting the front and rear position of the seat connecting seat 4, and a forward tilt adjustment mechanism 9 for adjusting the forward tilt function of the seat. This application integrates various functions into one, and the key lies in the linkage between the seat connecting seat and the base 1, the backrest connecting seat 2, and the base linkage seat 3, thereby realizing the adjustment of each mechanism. In particular, the linkage of each mechanism brings better adjustment effect to the backrest adjustment mechanism 6 and the forward tilt adjustment mechanism 9, making the adjustment more convenient and effortless. This seat chassis of this application has the advantages of simple structure, convenient operation, and wide applicability, which can meet the different usage needs of users. Moreover, each mechanism is independent of each other, making adjustment convenient and stable without affecting each other.

[0022] Furthermore, the seat connecting seat 4 in this case includes linkage plates 41 disposed on both sides of the base 1, a first connecting seat 42 fixedly connected to the linkage plates 41, and a seat connecting base 43 connected to the upper end of the first connecting seat 42. One end of the linkage plate 41 is hinged to the base 1 and the backrest connecting seat 2 via a pivot 44, and the other end is hinged to the base linkage seat 3 and can move with the movement of the three. One end of the linkage plate 41 is hinged to the end of the backrest connecting seat 2 that extends into the base 1, that is, the linkage plate 41, the backrest connecting seat 2, and the base 1 are coaxially hinged. Through the hinged design of both ends of the linkage plate 41, the mechanical linkage between the seat connecting seat 4 and the base 1, the backrest connecting seat 2, and the base linkage seat 3 is realized, ensuring the transmission efficiency of each adjustment function and ensuring the stability of the overall structure, especially the stability when each mechanism is adjusted. The layered design of the first connecting seat 42 and the seat connecting base 43 provides space for subsequent position adjustment, making the structure more compact, the function expansion more flexible, and the disassembly and assembly of the seat chassis relative to the seat more convenient.

[0023] Continue to refer to Figures 1 to 5 As shown, specifically, the backrest adjustment mechanism 6 of this case includes a support shaft 61 connected between the base 1 and the backrest connecting seat 2 and acting as a fulcrum, a backrest adjustment handle 62 located on the outside of the base 1, a paddle 63 located inside the base 1, and a gear plate 64 for locking in cooperation with the paddle 63. The gear plate 64 is fixedly connected to the side of the backrest connecting seat 2 that extends into the base 1.

[0024] In practical implementation, the support shaft serves as an auxiliary fulcrum for the rotation of the backrest connecting seat 2, enhancing stability during adjustment. Preferably, the backrest adjustment handle 62 is made of plastic with anti-slip texture on its surface; the gear shifting gear 64 is preferably a fan-shaped structure. The dual-fulcrum design of the support shaft 61 and the rotating shaft 44 in this case is more stable than the traditional single-fulcrum adjustment, avoiding wobbling during backrest adjustment; the multi-tooth structure of the gear shifting gear 64 provides multiple gear selections to meet the backrest angle needs of different users; the mechanical linkage structure of the handle and the paddle is simple and reliable, requiring no electronic components, reducing the risk of failure, and the adjustment process only requires hand rotation and backrest force, making operation labor-saving and convenient.

[0025] Furthermore, the paddle 63 is hinged to the base 1 via a connecting shaft 65, and one end of the backrest adjustment handle 62 that passes through the base 1 is provided with a first paddle block 621 that can rotate synchronously with the rotation of the backrest adjustment handle 62. At least two gear teeth 641 are provided on the gear plate 64. In this case, as shown... Figure 5 As shown, the gear teeth 641 of the gear plate 64 are arranged in an arc shape, which is adapted to the rotation trajectory of the backrest connecting seat 2. Preferably, there are four gear teeth 641, that is, four gear positions are provided for backrest adjustment, which is sufficient to meet the needs of users in the market. Of course, in specific implementation, different numbers of gear teeth 641 can be set according to the backrest adjustment angle and scenario requirements, and are not limited thereto. Preferably, a pressure plate 66 is connected to the upper end of the paddle 63. By setting the pressure plate 66, the swing direction of the paddle 63 is effectively restricted, preventing it from shifting position during movement and ensuring movement stability. In this case, the engagement between the paddle 63 and the gear teeth 641 is achieved through a mechanical structure, which is reliable in locking. Moreover, during reset, the paddle 63 is actively pushed into the gear teeth 641 by the paddle block 621. Compared with the spring structure engagement method commonly used in the prior art, this can avoid locking failure caused by spring aging and extend the service life of the adjustment mechanism.

[0026] When the user rotates the backrest adjustment handle 62, the first lever 621 rotates synchronously, driving the paddle 63 to swing around the connecting shaft 65; at this time, the user's back applies pressure, and the backrest connecting seat 2 rotates around the support shaft 61 and the rotating shaft 44, and the paddle 63 is unlocked from the gear plate 64; after adjusting to the appropriate angle, the handle is released, the backrest connecting seat 2 is reset, and the first lever 621 pushes the front end of the paddle 63 into the corresponding gear hole 641, completing the locking.

[0027] Continue to refer to Figures 1 to 5 As shown, specifically, the height adjustment mechanism 7 of this invention includes a mounting hole 71 on the base 1 for connecting to the gas spring of the seat, a cylinder switch (not shown) on the mounting hole 71 for controlling the operation of the swivel chair's cylinder, an L-shaped lifting rod 72 hinged to the base 1 for controlling the operation of the cylinder switch, and a height adjustment handle 73 located on the outside of the base 1 for driving the lifting rod 72. In specific implementation, the mounting hole 71 is used to install the seat's lifting gas spring. The L-shaped lifting rod 72 of this invention adopts a lever principle design, requiring only a small amount of handle rotation force to drive the cylinder switch, making operation convenient and labor-saving. A second lever 731 for driving the lifting rod 72 is provided at one end of the height adjustment handle 73 that passes through the base 1. The second lever 731 can rotate synchronously with the rotation of the height adjustment handle 73. The synchronous rotation structure of the height adjustment handle 73 and the second lever 731 is simple, has high transmission efficiency, and good stability through mechanical structure cooperation. It is also completely independent of other adjustment mechanisms, avoiding interference with the backrest angle when adjusting the height.

[0028] When seat height adjustment is required, rotate the height adjustment handle 73. The second lever 731 rotates synchronously and pushes up the extension end of the lifting rod 72, causing the lifting rod 72 to rotate around the hinge axis. Its other end presses down on the cylinder switch, and the pneumatic rod starts to extend and retract, realizing seat height adjustment. Release the handle, the second lever 731 resets, and the lifting rod 72 resets under its own weight or the optional action of the reset spring. The cylinder switch closes, and the height is locked.

[0029] Continue to refer to Figures 1 to 5 As shown, specifically, the seat connecting base 43 is slidably connected to the top of the first connecting seat 42. The position adjustment mechanism 8 of this invention includes at least two locking holes 81 arranged equidistantly on the seat connecting base 43, a first spring 82 connected between the seat connecting base 43 and the first connecting seat 42, a transmission rod 83 connected to the outside of one of the linkage plates 41, a locking strip 84 that can swing and engage / disengage from the locking holes 81 as the transmission rod 83 moves, a second spring 85 that resets the transmission rod 83, and a sleeve 86 connected to one end of the transmission rod 83 for driving the movement of the transmission rod 83. The sleeve 86 is rotatably connected to the backrest adjustment handle 62 or the height adjustment handle 73.

[0030] As described above, in specific implementation, the number of locking holes 81 is preferably six as provided by the lamp fixture. Through the cooperative design of the locking holes 81 and the locking strip 84, the fore-and-aft position of the seat can be adjusted to accommodate the legroom needs of users of different body types, and the locking is secure, preventing the seat from accidentally sliding during use. The first spring 82 is used to quickly return the seat connecting base 43 relative to the first connecting seat 42 to the initial position without external force, that is, to the state before the position was adjusted, making the adjustment and reset more convenient and eliminating the need for manual reset. The position adjustment mechanism 8 can be selectively set on one side of the backrest adjustment handle 62 or the height adjustment handle 73. The sleeve 86 is used to drive the transmission rod 83, and the sleeve 86 is fitted onto the backrest adjustment handle 62 or the height adjustment handle 73. It can operate independently without affecting the operation of either handle.

[0031] When the forward and backward position needs to be adjusted, rotating the sleeve 86 drives the transmission rod 83 to move axially, compressing the second spring 85. The transmission rod 83 causes the locking strip 84 to swing downward, with its top end disengaging from the locking hole 81. The user moves their hips to cause the seat connecting base 43 to slide back and forth relative to the first connecting seat 42. Once in position, rotating the sleeve 86 in the opposite direction causes the transmission rod 83 to reset under the action of the second spring 85, and the locking strip 84 swings upward and engages with the corresponding locking hole 81, completing the locking. If the user releases the sleeve 86, the first spring 82 can quickly reset the seat connecting base 43.

[0032] Reference Figures 1 to 5 As shown, specifically, the tilt adjustment mechanism 9 of this invention includes an adjustment crossbar 91 that passes laterally through the two end linkage plates 41 and the base 1. The adjustment crossbar 91 is connected to the linkage plates 41 via a drive mechanism that is respectively connected to the linkage plates 41 on both sides, thereby driving the linkage plates 41 to move. The first connecting seat 42 includes a horizontal plate 421 disposed on both sides and adapted to the linkage plates 41. The horizontal plate 421 is connected between the drive mechanism and the linkage plates 41. The lateral through-type design of the adjustment crossbar 91 ensures that the linkage plates 41 on both sides move synchronously, avoiding seat tilting caused by unilateral force, and making the adjustment more stable. The adapted connection between the horizontal plate 421 and the linkage plates 41 enhances the efficiency of force transmission, making the tilt adjustment more effortless. The independent setting of the tilt function provided in this invention meets the tilt needs of users in scenarios such as working at a desk, improving the functionality, comfort, and adjustment versatility of the seat.

[0033] When the user needs to adjust the seat to tilt forward, rotating the adjustment bar 91 drives the mechanism to move and, through the horizontal plate 421, causes the linkage plate 41 to swing around the hinge point. The linkage plate 41 causes the first connecting seat 42 and the seat connecting base 43 to tilt forward, thus realizing the seat tilting function. Reverse rotation of the adjustment bar 91 resets the mechanism and the seat returns to flat.

[0034] Furthermore, the drive mechanism of this case includes a drive block 92 connected to the adjusting crossbar 91 and capable of rotating together with the adjusting crossbar 91, and a base 93 fixedly connected to the cross plate 421. The base 93 has a limiting groove for the drive block 92 to rotate therein.

[0035] It should be noted that the specific structural features and principles of the forward tilt adjustment mechanism 9, the remaining drive mechanism, and the multi-positioning mechanism that are not described in this case have been disclosed in the applicant's previous patent applications. Those skilled in the art can refer to the published text of Chinese Utility Model Patent No. CN217365110U for specific implementation, and will not be elaborated here.

[0036] like Figures 1 to 5 As shown, in this case, one end of the base linkage seat 3 is hinged to the base 1 via a first central shaft 31, and the other end is hinged to the linkage plate 41 via a second central shaft 32. A torsion spring 33 is sleeved on the first central shaft 31, with one end of the torsion spring 33 abutting against the inner wall of the base linkage seat 3 and the other end extending into the base 1 and abutting against the inner wall of the base 1. The elasticity of the torsion spring 33 provides a stable restoring force for the base linkage seat 3, solving the problem of slow or stuck restoring after traditional chassis backrest adjustment, making the adjustment smoother. The preload of the torsion spring 33 increases the connection rigidity between the base linkage seat 3 and the base 1, and together with the supporting effect of the two, significantly improves the overall load-bearing capacity of the chassis, making it suitable for users with a wider weight range. At the same time, the buffering effect of the torsion spring 33 can reduce the impact force during adjustment, reduce component wear, and extend the chassis life.

[0037] A torsion spring is used to ensure the linkage and reset between the base linkage seat 3 and the base 1. The spring force requires the user to apply more force to press down on one end of the backrest connecting seat to trigger the linkage between the base linkage seat and the base 1, preventing instability and accidents during backrest adjustment, and making the adjustment process smoother. When the user presses down on the backrest connecting seat 2, the backrest connecting seat 2 drives the base linkage seat 3 to rotate around the first central axis 31 via the linkage plate 41, and the torsion spring 33 is twisted and stores force. When the user releases the backrest, the spring force of the torsion spring 33 drives the base linkage seat 3 to reset, which in turn drives the backrest connecting seat 2 and the linkage plate 41 to reset, preventing rapid fall due to gravity during adjustment and ensuring smooth adjustment.

[0038] As stated above, this case protects a multi-functional seat chassis, and all technical solutions that are the same as or similar to this case should be considered to fall within the scope of protection of this case.

Claims

1. A multifunctional seat chassis comprising a base (1), a backrest connecting seat (2) hinged to one end of the base (1) and a base linkage seat (3) hinged to the other end of the base (1), characterized in that: The upper end of the base (1) is connected to a seat connecting seat (4) that can be linked with the base (1), the backrest connecting seat (2) and the base linkage seat (3); the seat chassis also includes a backrest adjustment mechanism (6) for adjusting the tilt angle of the backrest connecting seat (2) relative to the base (1), a lifting adjustment mechanism (7) for adjusting the lifting function of the seat, a position adjustment mechanism (8) for adjusting the front and rear position of the seat connecting seat (4) and a forward tilt adjustment mechanism (9) for adjusting the forward tilt function of the seat.

2. A multi-functional seat pan according to claim 1, wherein: The seat connecting seat (4) includes a linkage plate (41) disposed on both sides of the base (1), a first connecting seat (42) fixedly connected to the linkage plate (41), and a seat connecting base (43) connected to the upper end of the first connecting seat (42). One end of the linkage plate (41) is hinged to the base (1) and the backrest connecting seat (2) through a pivot (44), and the other end is hinged to the base linkage seat (3) and can move with the movement of the three.

3. A multi-functional seat pan according to claim 2, wherein: The backrest adjustment mechanism (6) includes a support shaft (61) connected between the base (1) and the backrest connecting seat (2) and acting as a fulcrum, a backrest adjustment handle (62) located on the outside of the base (1), a paddle (63) located inside the base (1), and a gear plate (64) for locking in cooperation with the paddle (63). The gear plate (64) is fixedly connected to the side of the backrest connecting seat (2) that extends into the base (1).

4. A multi-functional seat pan according to claim 3, wherein: The paddle (63) is hinged to the base (1) via a connecting shaft (65). The backrest adjustment handle (62) is inserted into the base (1) at one end and is provided with a first paddle block (621) that can rotate synchronously with the backrest adjustment handle (62). The gear plate (64) is provided with at least two gear teeth (641). The upper end of the paddle (63) is connected to a pressure plate (66).

5. The multi-functional seat pan of claim 2, wherein: The lifting adjustment mechanism (7) includes a mounting hole (71) on the base (1) for connecting with the gas spring of the seat, a cylinder switch on the mounting hole (71) for controlling the operation of the cylinder of the swivel chair, an L-shaped lifting motion rod (72) hinged to the base (1) for controlling the operation of the cylinder switch, and a lifting adjustment handle (73) on the outside of the base (1) for driving the lifting motion rod (72). The end of the lifting adjustment handle (73) that passes through the base (1) is provided with a second lever (731) for driving the lifting motion rod (72). The second lever (731) can rotate synchronously with the rotation of the lifting adjustment handle (73).

6. A multi-functional seat pan according to any one of claims 3 or 5, wherein: The seat connecting base (43) is slidably connected to the top of the first connecting seat (42). The position adjustment mechanism (8) includes at least two locking holes (81) arranged equidistantly on the seat connecting base (43), a first spring (82) connected between the seat connecting base (43) and the first connecting seat (42), a transmission rod (83) connected to the outside of one of the linkage plates (41), a locking strip (84) that can swing and lock into / unlock the locking holes (81) as the transmission rod (83) moves, a second spring (85) that resets the transmission rod (83), and a sleeve (86) connected to one end of the transmission rod (83) for driving the transmission rod (83) to move. The sleeve (86) is rotatably connected to the backrest adjustment handle (62) or the height adjustment handle (73).

7. The multi-functional seat pan of claim 2, wherein: The forward tilt adjustment mechanism (9) includes an adjustment crossbar (91) that passes laterally through the two end linkage plates (41) and the base (1). The adjustment crossbar (91) is connected to the linkage plates (41) through the drive mechanism connected to the linkage plates (41) on both sides, thereby driving the linkage plates (41) to move. The first connecting seat (42) includes a horizontal plate (421) that is disposed on both sides and adapted to the linkage plates (41). The horizontal plate (421) is connected between the drive mechanism and the linkage plates (41).

8. A multi-functional seat pan according to claim 7, wherein: The driving mechanism includes a driving block (92) connected to the adjusting crossbar (91) and rotating together with the adjusting crossbar (91), and a base (93) fixedly connected to the cross plate (421). The base (93) has a limiting groove for the driving block (92) to rotate therein.

9. The multi-functional seat pan of claim 2, wherein: One end of the base linkage seat (3) is hinged to the base (1) via the first central shaft (31), and the other end is hinged to the linkage plate (41) via the second central shaft (32). A torsion spring (33) is sleeved on the first central shaft (31). One end of the torsion spring (33) abuts against the inner wall surface of the base linkage seat (3), and the other end extends into the base (1) and abuts against the inner wall surface of the base (1).

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