Seat pan mechanism

Abstract

The application relates to a seat chassis mechanism, belonging to the technical field of seat accessories, which comprises a base support, a back plate support and a chair plate support movably installed on the base support; the base support is provided with a first fixed rod and a second fixed rod which are parallel to each other; the back plate support is hinged to the first fixed rod, and the first fixed rod is sleeved with a driving torsional spring; a linkage structure for linking the back plate support and the chair plate support to swing forward and backward is arranged between the front end of the back plate support and the chair plate support; the chair plate support comprises a mounting panel and a supporting side plate connected to the mounting panel; the supporting side plate is provided with a first guide groove for sliding cooperation of the end of the first fixed rod and a second guide groove for sliding cooperation of the end of the second fixed rod. The application has the effect of meeting the lying use requirements of different people in different scenes.

Description

Technical Field

[0001] This application relates to the field of seat accessories, and more particularly to a seat chassis mechanism. Background Technology

[0002] With the fast pace of life and work, people are spending increasingly more time in chairs such as dining chairs, conference chairs, and computer chairs. Comfortable chairs can bring a better experience to people's work and study, so people are more inclined to choose chairs and related products that can meet different usage scenarios.

[0003] Traditional dining chairs often have fixed or no backrests, preventing users from reclining and causing fatigue due to lack of lumbar support during prolonged sitting. While some existing conference and office chairs offer reclining functionality, they are often complex in structure, expensive, and their tilt angles are typically designed for a single work or rest scenario, failing to meet diverse usage needs. A home study environment requires chairs that provide adequate reclining relaxation while ensuring stable support for work or study.

[0004] In view of the aforementioned technologies, and in order to meet the reclining usage needs of different people in different scenarios, the inventor believes that a seat chassis mechanism can be provided. Utility Model Content

[0005] To meet the reclining usage needs of different people in different scenarios, this application provides a seat chassis mechanism.

[0006] The seat chassis mechanism provided in this application adopts the following technical solution: A seat chassis mechanism includes a base bracket, a backrest bracket, and a seat plate bracket movably mounted on the base bracket. The base bracket is equipped with a first fixed rod and a second fixed rod that are parallel to each other. The backrest bracket is hinged to the first fixed rod, and a driving torsion spring is sleeved on the first fixed rod. The driving torsion spring causes the rear end of the backrest bracket to always have an upward flipping tendency. A linkage structure is provided between the front end of the backrest bracket and the seat plate bracket to link the backrest bracket and the seat plate bracket to swing back and forth. The seat plate bracket includes a mounting panel and a support side plate connected to the mounting panel. The support side plate is provided with a first guide groove for the end of the first fixed rod to slide and a second guide groove for the end of the second fixed rod to slide. The first guide groove and the second guide groove are arranged in parallel and are both inclined to the rearward side along the height direction.

[0007] By adopting the above technical solution, the base support, backrest support, and seat support are hinged and movable, allowing the seat angle to be adjusted during use. The compression elasticity of the drive torsion spring ensures that the rear end of the backrest support always tends to flip upwards. A linkage structure enables the backrest support and seat support to swing back and forth in unison. The sliding engagement of the first fixed rod in the first guide groove and the sliding engagement of the second fixed rod in the second guide groove, along with the parallel arrangement of the first and second guide grooves and their rearward inclination along the height direction, allows the seat support and backrest support to achieve stable swinging motion and a suitable tilt angle, meeting the adjustment needs during seat use.

[0008] Optionally, the outer side of the support side plate is provided with a first protruding ring along the edge of the first guide groove, and a first bushing for cooperating with the end of the first fixing rod is installed at the first guide groove; the outer side of the support side plate is provided with a second protruding ring along the edge of the second guide groove, and a second bushing for cooperating with the end of the second fixing rod is installed at the second guide groove.

[0009] By adopting the above technical solution, a first protruding ring is provided along the edge of the first guide groove on the outer side of the support side plate, and a first bushing is installed thereon. A second protruding ring is provided along the edge of the second guide groove, and a second bushing is installed thereon. The first protruding ring can increase the thickness of the first guide groove, thereby strengthening the structural strength at the first guide groove. The second protruding ring can increase the thickness of the second guide groove, thereby strengthening the structural strength at the second guide groove. The first bushing can isolate the direct contact between the first fixed rod and the first guide groove, reducing wear between the end of the first fixed rod and the first guide groove; the second bushing can isolate the direct contact between the second fixed rod and the second guide groove, reducing wear between the end of the second fixed rod and the second guide groove, improving the service life of the overall mechanism and enhancing the smoothness of movement of the first fixed rod in the first guide groove and the second fixed rod in the second guide groove.

[0010] Optionally, the first bushing includes a first support portion disposed at the first guide groove and a first limiting portion abutting against the inner wall of the support side plate; the first support portion extends out of the first guide groove; a first limiting piece abutting against the end of the first support portion is installed at the end of the first fixing rod; the second bushing includes a second support portion disposed at the second guide groove and a second limiting portion abutting against the inner wall of the support side plate; the second support portion extends out of the second guide groove; a second limiting piece abutting against the end of the second support portion is installed at the end of the second fixing rod.

[0011] By adopting the above technical solution, the first bushing includes a first support portion and a first limiting portion, and the second bushing includes a second support portion and a second limiting portion, which reduces the contact friction between the inner wall of the support side plate and the back plate bracket, thereby improving the service life of the mechanism. The first support portion extends out of the first guide groove, and the end of the first fixing rod is equipped with a first limiting piece that abuts against the end of the first support portion, which can reduce the possibility of the first fixing rod sliding left and right and reduce the possibility of the first fixing rod coming out of the first guide groove; the second support portion extends out of the second guide groove, and the end of the second fixing rod is equipped with a second limiting piece that abuts against the end of the second support portion, which can reduce the possibility of the second fixing rod sliding left and right and reduce the possibility of the second fixing rod coming out of the second guide groove, thereby enhancing the stability of the mechanism.

[0012] Optionally, the end of the first fixing rod is provided with a first annular groove and a first retaining spring installed in the first annular groove to abut the first limiting piece against the first support portion; the end of the second fixing rod is provided with a second annular groove and a second retaining spring installed in the second annular groove to abut the second limiting piece against the second support portion.

[0013] By adopting the above technical solution, a first annular groove and a first retaining spring located in the first annular groove are provided on the first fixed rod, and the first limiting piece abuts against the first support part, which improves the stability of the first fixed rod in the first guide groove and reduces the probability of the first fixed rod slipping; a second annular groove and a second retaining spring located in the second annular groove are provided on the second fixed rod, and the second limiting piece abuts against the second support part, which improves the stability of the second fixed rod in the second guide groove, reduces the probability of the second fixed rod slipping, and improves the overall stability of the mechanism.

[0014] Optionally, the base bracket has a mounting sleeve; when the first fixing rod abuts against the top end of the first guide groove and the second fixing rod abuts against the top end of the second guide groove, the mounting panel is perpendicular to the axis of the mounting sleeve; when the first fixing rod abuts against the bottom end of the first guide groove and the second fixing rod abuts against the bottom end of the second guide groove, the tilt angle A formed by the axis of the mounting panel and the mounting sleeve is in the range of 75° to 85°.

[0015] By adopting the above technical solution, when the first fixing rod slides to the top of the first guide groove and the second fixing rod slides to the top of the second guide groove, the mounting panel is perpendicular to the axis of the mounting sleeve, providing a stable support state; when the first fixing rod slides to the bottom of the first guide groove and the second fixing rod slides to the bottom of the second guide groove, the mounting panel and the axis of the mounting sleeve form a tilt angle A, achieving a reasonable tilt angle and meeting the tilt requirements when the seat is reclined.

[0016] Optionally, the linkage structure includes a first linkage rod installed at the front end of the back plate bracket and a first linkage sliding hole disposed on the support side plate for sliding engagement of the end of the first linkage rod.

[0017] By adopting the above technical solution, the backrest support and seat support of the seat chassis mechanism achieve linkage for back-and-forth swinging through the cooperation of the first linkage rod and the first linkage sliding hole. The first fixed rod can slide in the first guide groove, and the second fixed rod can slide in the second guide groove, thereby realizing the linkage swinging function of the backrest support and the seat support. The drive torsion spring causes the rear end of the backrest support to have an upward flipping tendency, thus enabling the backrest support...

[0018] Optionally, the outer side of the support side plate is provided with a third protruding ring along the edge of the first linkage sliding hole, and a third bushing for cooperating with the end of the first linkage rod is installed at the first linkage sliding hole; the third bushing includes a third support portion arranged at the first linkage sliding hole and a third limiting portion abutting against the inner wall of the support side plate; the third support portion extends out of the first linkage sliding hole; and a third limiting piece abutting against the end of the third support portion is installed at the end of the first linkage rod.

[0019] By adopting the above technical solution, a third protruding ring is provided on the outer side of the support plate along the edge of the first linkage sliding hole, which can enhance the structural strength at the first linkage sliding hole. Installing the third bushing can reduce the friction between the first linkage rod and the first linkage sliding hole, and improve the smoothness of the movement of the first linkage rod. The third support part of the third bushing extends out of the first linkage sliding hole, and cooperates with the third limiting piece at the end of the first linkage rod to limit the end of the first linkage rod, reducing the probability of the first linkage rod sliding to the left or right or disengaging from the first linkage sliding hole, and ensuring the stability and reliability of the linkage structure.

[0020] Optionally, the linkage structure includes a second linkage rod installed at both ends on the support side plate and a second linkage sliding hole disposed on the back plate bracket for sliding engagement of the end of the second linkage rod.

[0021] By adopting the above technical solution, the back panel support and the chair support are linked by the second linkage rod and the second linkage sliding hole. The second linkage rod slides in the second linkage sliding hole, which allows the back panel support and the chair support to swing back and forth.

[0022] Optionally, the outer side of the back plate bracket is provided with a fourth protruding ring along the edge of the second linkage sliding hole, and a fourth bushing for cooperating with the end of the second linkage rod is installed at the second linkage sliding hole; the fourth bushing includes a fourth support portion that extends out of the second linkage sliding hole and abuts against the base bracket.

[0023] By adopting the above technical solution, a fourth protruding ring is provided on the outer side of the back plate bracket along the edge of the second linkage sliding hole, which can enhance the structural strength at the second linkage sliding hole. Installing the fourth bushing can reduce the friction between the end of the second linkage rod and the second linkage sliding hole, improving the smoothness of the movement of the second linkage rod. The fourth support part of the fourth bushing extends out of the second linkage sliding hole and abuts against the base bracket, which can reduce the friction between the back plate bracket and the base bracket, improve the smoothness of the linkage structure, and enhance the stability of the linkage structure.

[0024] Optionally, the first fixed rod sleeve is provided with a protective rod sleeve, and the driving torsion spring is sleeved on the protective rod sleeve.

[0025] By adopting the above technical solution, a protective sleeve is fitted onto the first fixed rod, and the drive torsion spring is fitted onto the protective sleeve. This protects the drive torsion spring, reduces wear caused by direct contact between the drive torsion spring and the first fixed rod, and extends the service life of the drive torsion spring. It also reduces frictional noise between the drive torsion spring and the first fixed rod, improving user comfort when using the seat.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. A seat chassis mechanism, wherein by setting a base support, a back support and a seat support, the linkage structure enables the seat support and the back support to cooperate to achieve stable swinging motion and a suitable tilt angle, which can meet the user's adjustment needs for the seat; 2. By setting a first fixing rod and a first guide groove, and setting a second fixing rod and a second guide groove, the seat support and backrest support can swing at a certain angle, providing precise guidance and stable support for seat tilting, thereby improving the user's comfort when using the seat; 3. By providing a first limiting piece, a first annular groove, and a first retaining ring at the end of the first fixed rod, and a first bushing in the first guide groove, and providing a second limiting piece, a second annular groove, and a second retaining ring at the end of the second fixed rod, and a second bushing in the second guide groove, the probability of the first and second fixed rods sliding left and right or even coming off can be reduced, thereby enhancing the smoothness and stability of the mechanism's movement. Attached Figure Description

[0027] Figure 1 This is a structural schematic diagram of the seat chassis mechanism in Embodiment 1 of this application.

[0028] Figure 2 This is an exploded view of the seat chassis mechanism in Embodiment 1 of this application.

[0029] Figure 3 This is a partial schematic diagram of the seat chassis mechanism in Embodiment 1 of this application.

[0030] Figure 4 This is Example 1 of this application. Figure 3 A magnified view of a section at point B.

[0031] Figure 5 This is Example 1 of this application. Figure 3 A magnified view of a section at point C.

[0032] Figure 6 This is a side view of the seat chassis mechanism in Embodiment 1 of this application.

[0033] Figure 7 This is Example 1 of this application. Figure 3 A magnified view of a section at point D.

[0034] Figure 8 This is a structural schematic diagram of the seat chassis mechanism in Embodiment 2 of this application.

[0035] Explanation of reference numerals in the attached drawings: 1. Base bracket; 11. Base panel; 111. Pivot hole; 112. Mounting sleeve; 12. Base side plate; 121. First fixing hole; 122. Second fixing hole; 123. Reinforcing ring; 124. Moving through hole; 2. Back panel bracket; 21. Back panel; 22. Back panel side plate; 221. Second linkage sliding hole; 222. Fourth bushing; 223. Fourth support part; 3. Chair seat bracket; 31. Mounting panel; 32. Support side plate; 321. First guide groove; 322. First ring; 323. First bushing; 3231. First support part; 3232. First limiting part; 324. Second guide groove; 325. Second ring; 326. Second bushing; 327. 1. Second support part; 3262. Second limiting part; 327. First linkage sliding hole; 328. Third convex ring; 329. Third bushing; 3291. Third support part; 3292. Third limiting part; 4. Fixed outer shell; 5. First fixing rod; 51. Protective rod sleeve; 52. Drive torsion spring; 521. Fixed end; 522. Force-applying end; 53. Hinge sleeve; 531. Hinge convex ring; 54. First limiting piece; 55. First annular groove; 56. First snap ring; 6. Second fixing rod; 61. Second limiting piece; 62. Second annular groove; 63. Second snap ring; 7. Torsion spring fixing rod; 8. First linkage rod; 81. Third limiting piece; 82. Third annular groove; 83. Third snap ring; 9. Second linkage rod. Detailed Implementation

[0036] The following is in conjunction with the appendix Figure 1-8 This application will be described in further detail.

[0037] This application discloses a seat chassis mechanism.

[0038] Example 1 Reference Figure 1 and Figure 2A seat chassis mechanism includes a base support 1, a backrest support 2, a seat plate support 3 movably mounted on the base support 1, and a fixed outer shell 4 enclosing the lower side of the base support 1. The seat plate support 3 includes a mounting panel 31 and supporting side plates 32 connected to the upper sides of both sides of the mounting panel 31. The base support 1 has a base panel 11 and base side plates 12 connected to both sides of the base panel 11. The base panel 11 has a pivot hole 111 for the seat pivot to pass through and a mounting sleeve 112 disposed in the pivot hole 111. The upper and lower ends of the mounting sleeve 112 extend beyond the upper and lower bottom surfaces of the base panel 11, providing tilting and limiting function for the pivot.

[0039] Reference Figure 1 and Figure 2 The supporting side plate 32 has a first guide groove 321 and a second guide groove 324 at both ends, which are parallel to each other and inclined rearward along the height direction. The first guide groove 321 is located at the rear end, and the second guide groove 324 is located at the front end. The base side plate 12 has a first fixing hole 121 corresponding to the first guide groove 321 and a second fixing hole 122 corresponding to the second guide groove 324. A first fixing rod 5 is installed in the first fixing hole 121, and a second fixing rod 6 is installed in the second fixing hole 122. The first fixing rod 5 and the second fixing rod 6 are parallel to each other. The second fixing holes 122 are arranged opposite each other and have a reinforcing protrusion 123 on their inner side to provide support for the second fixing rod 6.

[0040] Reference Figure 2 and Figure 3 The backrest bracket 2 is hinged to the first fixed rod 5. The first fixed rod 5 is provided with a protective rod sleeve 51, and a driving torsion spring 52 is fitted around the outer periphery of the protective rod sleeve 51. The driving torsion spring 52 includes a fixed end 521 that abuts against the edge of the base panel 11 and a force-applying end 522. The backrest bracket 2 includes a backrest side plate 22 and a backrest panel 21 for backrest installation. A torsion spring fixing rod 7 parallel to the first fixed rod 5 is fixed between the two backrest side plates 22. The force-applying end 522 of the driving torsion spring 52 has a torsion spring fixing groove that abuts against the lower side of the torsion spring fixing rod 7. When the backrest bracket 2 is tilted and the torsion spring fixing rod 7 is pressed down, the driving torsion spring 52 has the potential energy to restore its original state, causing the rear end of the backrest bracket 2 to always have an upward flipping tendency. A hinge hole is provided at the hinge joint between the first fixed rod 5 and the backrest side plate 22, and a hinge sleeve 53 is provided at the hinge hole of the first fixed rod 5. A hinge protrusion 531 is provided on the outer side of the back plate side plate 22 along the edge of the hinge hole. The hinge protrusion 531 is close to the base side plate 12 to reduce the contact friction between the back plate side plate 22 and the base side plate 12.

[0041] Reference Figure 2 and Figure 4A first protruding ring 322 is provided on the outer side of the support side plate 32 along the edge of the first guide groove 321, and a first bushing 323 for engaging with the end of the first fixing rod 5 is installed in the first guide groove 321. The first bushing 323 includes a first support portion 3231 arranged in the first guide groove 321 and a first limiting portion 3232 abutting against the inner wall of the support side plate 32. The first limiting portion 3232 provides a partition between the base side plate 12 and the support side plate 32 bracket. The first support portion 3231 extends out of the first guide groove 321. A first limiting piece 54 abutting against the end of the first support portion 3231 is installed at the end of the first fixing rod 5. The end of the first fixing rod 5 is also provided with a first annular groove 55 and a first retaining spring 56 installed in the first annular groove 55 to abut the first limiting piece 54 against the first support portion 3231. The end of the first fixing rod 5 passes through the back plate side plate 22, the base side plate 12 and the support side plate 32 from the inside to the outside. The first retaining ring 56 presses the first limiting piece 54 against the first support part 3231, reducing the probability of the first fixing rod 5 sliding left and right when moving in the first guide groove 321.

[0042] Reference Figure 2 and Figure 5 A second protruding ring 325 is provided on the outer side of the support side plate 32 along the edge of the second guide groove 324, and a second bushing 326 for engaging with the end of the second fixing rod 6 is installed in the second guide groove 324. The second bushing 326 includes a second support portion 3261 arranged in the second guide groove 324 and a second limiting portion 3262 abutting against the inner wall of the support side plate 32. The second limiting portion 3262 provides a partition between the base side plate 12 and the support side plate 32 bracket. The second support portion 3261 extends out of the second guide groove 324. A second limiting piece 61 abutting against the end of the second support portion 3261 is installed at the end of the second fixing rod 6. The end of the second fixing rod 6 is also provided with a second annular groove 62 and a second retaining spring 63 installed in the second annular groove 62 to abut the second limiting piece 61 against the second support portion 3261. The end of the second fixing rod 6 passes through the back plate side plate 22, the base side plate 12 and the support side plate 32 from the inside to the outside. The second retaining ring 63 presses the second limiting piece 61 against the second support part 3261, reducing the probability of the second fixing rod 6 sliding left and right when moving in the second guide groove 324.

[0043] Reference Figure 2 and Figure 6The chair support 3 is movably mounted on the base support 1 and has both horizontal and tilted states. When the chair support 3 is in the horizontal state, the first fixing rod 5 abuts against the top of the first guide groove 321 and the second fixing rod 6 abuts against the top of the second guide groove 324. At this time, the mounting panel 31 is perpendicular to the axis of the mounting sleeve 112. When the chair support 3 is in the tilted state, the first fixing rod 5 abuts against the bottom of the first guide groove 321 and the second fixing rod 6 abuts against the bottom of the second guide groove 324. At this time, the acute angle formed by the axis of the mounting panel 31 and the mounting sleeve 112 is the tilt angle A, which ranges from 75° to 85°. In this embodiment, the tilt angle A ranges from 77°.

[0044] Reference Figure 2 and Figure 7 A linkage structure is provided between the front end of the backrest support 2 and the seat support 3 to allow the backrest support 2 and the seat support 3 to swing back and forth. The linkage structure includes a first linkage rod 8 installed at the front end of the backrest side plate 22 and a first linkage sliding hole 327 provided on the support side plate 32 for the end of the first linkage rod 8 to slide and engage. The base side plate 12 also has a moving through hole 124 for the first linkage rod 8 to move up and down. A third protruding ring 328 is provided on the edge of the first linkage sliding hole 327, and a third bushing 329 for engaging with the end of the first linkage rod 8 is installed at the first linkage sliding hole 327. The third bushing 329 includes a third support part 3291 arranged at the first linkage sliding hole 327 and a third limiting part 3292 abutting against the inner wall of the support side plate 32. The third support part 3291 extends out of the first linkage sliding hole 327. A third limiting piece 81 abutting against the end of the third support part 3291 is installed at the end of the first linkage rod 8 that extends out of the third support part 3291. The end of the third fixed rod is also provided with a third annular groove 82 and a third retaining spring 83 installed in the third annular groove 82 to abut the third limiting piece 81 against the third support part 3291. The third retaining spring 83 presses the third limiting piece 81 tightly against the third support part 3291, reducing the probability of the third fixed rod sliding left and right when moving in the third guide groove.

[0045] Reference Figures 1 to 7 The implementation principle of a seat chassis mechanism according to an embodiment of this application is as follows: When the user does not apply a backward tilting force to the backrest support 2, the torsion spring fixing rod 7 does not apply pressure to the drive torsion spring 52, the backrest panel 21 is parallel to the base panel 11, the first fixing rod 5 abuts against the top of the first guide groove 321, the second fixing rod 6 abuts against the top of the second guide groove 324, and the first linkage rod 8 abuts against the bottom of the first linkage sliding hole 327. At this time, the mounting panel 31 is perpendicular to the axis of the mounting sleeve 112. When the user leans against the backrest support 2, a backward tilting force is applied to the backrest support 2. The backrest support 2 drives the torsion spring fixing rod 7 to apply pressure to the drive torsion spring 52, the backrest panel 21 tilts and rotates, the first linkage rod 8 rotates upward around the first fixing rod 5, and drives the chair support 3 to move upward along the first linkage sliding hole 327. The first guide groove 321 moves on the first fixing rod 5, the second guide groove 324 moves on the second fixing rod 6, and drives the chair support 3 to change from a horizontal state to a tilted state.

[0046] Example 2 Reference Figures 1 to 8 Compared with the seat chassis mechanism in Example 1, Example 2 is identical to Example 1 except for the linkage structure. The linkage structure includes a second linkage rod 9 mounted at both ends on the support side plate 32 and a second linkage sliding hole 221 disposed on the backrest bracket 2 for sliding engagement of the end of the second linkage rod 9. A fourth bushing 222 for engaging with the end of the second linkage rod 9 is installed on the outer side of the backrest bracket 2 at the second linkage sliding hole 221; the fourth bushing 222 includes a fourth support portion 223 extending out of the second linkage sliding hole 221 and abutting against the base bracket 1.

[0047] The implementation principle of a seat chassis mechanism in this application embodiment is as follows: When the user does not apply a backward tilting force to the backrest support 2, the torsion spring fixing rod 7 does not apply pressure to the drive torsion spring 52, the backrest panel 21 is parallel to the base panel 11, the first fixing rod 5 abuts against the top of the first guide groove 321, the second fixing rod 6 abuts against the top of the second guide groove 324, and the first linkage rod 8 abuts against the bottom of the first linkage sliding hole 327. At this time, the mounting panel 31 is perpendicular to the axis of the mounting sleeve 112. When the user leans against the backrest support 2, a backward tilting force is applied to the backrest support 2. The backrest support 2 drives the torsion spring fixing rod 7 to apply pressure to the drive torsion spring 52, the backrest panel 21 tilts and rotates, the second linkage rod 9 rotates upward around the first fixing rod 5, and drives the seat support 3 to move upward along the second linkage sliding hole 221. The first guide groove 321 moves on the first fixing rod 5, the second guide groove 324 moves on the second fixing rod 6, and drives the seat support 3 to change from a horizontal state to a tilting state.

[0048] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A seat chassis mechanism, comprising a base support (1), a backrest support (2), and a seat support (3) movably mounted on the base support (1); the base support (1) is equipped with a first fixing rod (5) and a second fixing rod (6) that are parallel to each other; the backrest support (2) is hinged to the first fixing rod (5), the first fixing rod (5) is sleeved with a driving torsion spring (52), the driving torsion spring (52) causing the rear end of the backrest support (2) to always have an upward flipping tendency; the front end of the backrest support (2) and the seat support (3) A linkage structure is provided between the backrest bracket (2) and the chair bracket (3) to swing back and forth; the chair bracket (3) includes a mounting panel (31) and a support side plate (32) connected to the mounting panel (31). The support side plate (32) is provided with a first guide groove (321) for sliding cooperation of the end of the first fixing rod (5) and a second guide groove (324) for sliding cooperation of the end of the second fixing rod (6); the first guide groove (321) and the second guide groove (324) are arranged in parallel and are both inclined to the rear side along the height direction.

2. A seat pan mechanism according to claim 1, wherein, The outer side of the support side plate (32) is provided with a first protruding ring (322) along the edge of the first guide groove (321), and a first bushing (323) for cooperating with the end of the first fixing rod (5) is installed at the first guide groove (321); the outer side of the support side plate (32) is provided with a second protruding ring (325) along the edge of the second guide groove (324), and a second bushing (326) for cooperating with the end of the second fixing rod (6) is installed at the second guide groove (324).

3. A seat pan mechanism according to claim 2, wherein, The first bushing (323) includes a first support portion (3231) disposed at the first guide groove (321) and a first limiting portion (3232) abutting against the inner wall of the support side plate (32); the first support portion (3231) extends out of the first guide groove (321); the end of the first fixing rod (5) is equipped with a first limiting piece (54) abutting against the end of the first support portion (3231); the second bushing (326) includes a second support portion (3261) disposed at the second guide groove (324) and a second limiting portion (3262) abutting against the inner wall of the support side plate (32); the second support portion (3261) extends out of the second guide groove (324); the end of the second fixing rod (6) is equipped with a second limiting piece (61) abutting against the end of the second support portion (3261).

4. A seat pan mechanism according to claim 3, wherein, The end of the first fixing rod (5) is provided with a first annular groove (55) and a first retaining ring (56) installed in the first annular groove (55) to abut the first limiting piece (54) against the first support part (3231); the end of the second fixing rod (6) is provided with a second annular groove (62) and a second retaining ring (63) installed in the second annular groove (62) to abut the second limiting piece (61) against the second support part (3261).

5. A seat pan mechanism according to claim 1 wherein, The base bracket (1) has a mounting sleeve (112); when the first fixing rod (5) abuts against the top end of the first guide groove (321) and the second fixing rod (6) abuts against the top end of the second guide groove (324), the mounting panel (31) is perpendicular to the axis of the mounting sleeve (112); when the first fixing rod (5) abuts against the bottom end of the first guide groove (321) and the second fixing rod (6) abuts against the bottom end of the second guide groove (324), the range of A formed by the axis of the mounting panel (31) and the mounting sleeve (112) is 75° to 85°.

6. A seat chassis mechanism according to any one of claims 1 to 4, characterized in that, The linkage structure includes a first linkage rod (8) installed at the front end of the back plate bracket (2) and a first linkage sliding hole (327) disposed on the support side plate (32) for sliding engagement of the end of the first linkage rod (8).

7. A seat chassis mechanism according to claim 6, characterized in that, The outer side of the support side plate (32) is provided with a third protruding ring (328) along the edge of the first linkage sliding hole (327), and a third bushing (329) for cooperating with the end of the first linkage rod (8) is installed at the first linkage sliding hole (327); the third bushing (329) includes a third support part (3291) arranged at the first linkage sliding hole (327) and a third limiting part (3292) abutting against the inner wall of the support side plate (32); the third support part (3291) extends out of the first linkage sliding hole (327); the end of the first linkage rod (8) is provided with a third limiting piece (81) abutting against the end of the third support part (3291).

8. A seat chassis mechanism according to any one of claims 1 to 4, characterized in that, The linkage structure includes a second linkage rod (9) installed at both ends on the support side plate (32) and a second linkage sliding hole (221) provided on the back plate bracket (2) for sliding engagement of the end of the second linkage rod (9).

9. A seat chassis mechanism according to claim 8, characterized in that, The back plate bracket (2) has a fourth bushing (222) installed on the outside of the second linkage sliding hole (221) for engaging with the end of the second linkage rod (9); the fourth bushing (222) includes a fourth support portion (223) extending out of the second linkage sliding hole (221) and abutting against the base bracket (1).

10. A seat chassis mechanism according to any one of claims 1 to 4, characterized in that, The first fixing rod (5) is fitted with a protective rod sleeve (51), and the driving torsion spring (52) is fitted on the protective rod sleeve (51).

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