A seat tray

Abstract

The application discloses a seat tray which comprises a seat tray, a chair back connecting plate, an upper mounting shell, a lower mounting shell and an elastic adjusting mechanism; the chair back connecting plate is rotationally connected with the upper mounting shell and the lower mounting shell. The elastic adjusting mechanism comprises an adjusting plate, a spring assembly, a first positioning shaft, a second positioning shaft, a gear adjusting assembly for controlling the height of the first positioning shaft and the bottom of the lower mounting shell; the first positioning shaft is fixed on the adjusting plate, and the adjusting plate is connected on the chair back connecting plate; the second positioning shaft is slidably connected on the upper mounting shell at both ends; the spring assembly is rotationally connected on the side wall of the first positioning shaft and the second positioning shaft at both ends; the gear adjusting assembly comprises a mounting seat rotationally connected on a mounting shaft, a gear plate provided with a positioning groove for embedding the first positioning shaft on the mounting seat and an adjusting rod for controlling the rotation adjustment of the gear plate. The application has the effect that the seat tray can provide graded rebound force adjustment according to the weight of a user.

Description

Technical Field

[0001] This application relates to the field of office furniture technology, and in particular to a chair tray. Background Technology

[0002] With the increasing prevalence of home and office work, users are demanding higher comfort levels for their chairs. Traditional chair trays, due to their simple structure, have limited adjustment functions, and prolonged use can easily lead to lumbar fatigue. Existing technology, such as Chinese Patent Publication No. CN218500300U, describes an adjustable office chair comprising a seat, a first sleeve, and a second lifting sleeve. The second lifting sleeve is fitted inside the first sleeve, and the seat is mounted on the second lifting sleeve. One end of the second lifting sleeve is connected to the seat, and the other end is fitted with a damper connected to the inner wall of the first sleeve. A tension spring is mounted on the damper. Regarding the aforementioned technologies, the first sleeve and the second sleeve are nested together to form a seat support structure. However, since this structure can only adjust the height of the seat, it cannot meet the personalized needs of users for adjusting the seat rebound force, height, and tilt angle due to differences in their body shape. Therefore, the inventor believes that the current seat tray has the defect of not being able to provide graded adjustment of rebound force according to the user's weight. Utility Model Content

[0003] To address the issue of providing graded adjustable rebound force based on user weight in such seat trays, this application provides a seat tray.

[0004] The seat tray provided in this application adopts the following technical solution: a seat tray, comprising: A seat tray includes a backrest connecting plate, an upper mounting shell fixed to the bottom of the seat, and a lower mounting shell fixed to the top of the seat support structure. The upper end of the backrest connecting plate is rotatably connected to the upper mounting shell, and the lower end of the backrest connecting plate is rotatably connected to the lower mounting shell via a mounting shaft. The elastic adjustment mechanism includes an adjustment plate, a spring assembly, a first positioning shaft, a second positioning shaft, and a gear adjustment assembly for controlling the height of the first positioning shaft relative to the bottom of the lower mounting housing; The first positioning shaft is fixed at both ends to the inner walls of one side of the adjustment plate, and the other end of the adjustment plate is rotatably connected to the chair back connecting plate; on the other hand, the first positioning shaft can also be positioned on the chair back connecting plate by sliding. The second positioning shaft is rotatably positioned on the lower mounting shell at both ends, and the second positioning shaft is located at the other end of the lower mounting shell away from the first positioning shaft; the second positioning shaft is limited and slidably connected to the upper mounting shell on both sides. The two ends of the spring assembly are rotatably connected to the side walls of the first positioning shaft and the second positioning shaft, respectively; The gear adjustment assembly includes a mounting base rotatably connected to the mounting shaft, a gear plate having multiple positioning slots of different heights for the first positioning shaft to be embedded in, and an adjustment rod connected at one end to the gear plate and used to control the gear plate to rotate and adjust the positioning slots to achieve different insertion positions of the positioning slots and the first positioning shaft.

[0005] By adopting the above technical solution, the upper end of the chair back connecting plate is rotatably connected to the upper mounting shell, and the lower end is rotatably connected to the lower mounting shell via a mounting shaft. The elastic adjustment mechanism is installed inside the lower mounting shell. The first positioning shaft is connected to one end of an adjustment plate, the other end of which is rotatably connected to the chair back connecting plate; alternatively, the adjustment plate is directly fixed to the chair back connecting plate, and the first positioning shaft is slidably connected to the adjustment plate. The second positioning shaft is rotatably connected to the lower mounting shell, and its two ends are externally limited and slidably connected to the upper mounting shell. Furthermore, the elastic component is positioned between the first and second positioning shafts to limit the distance between them.

[0006] When the backrest connecting plate is subjected to pressure from the human body, one end of the backrest connecting plate will rotate relative to the lower mounting shell. At this time, due to the setting of the adjustment plate through the first positioning shaft and the elastic component, the adjustment plate will rotate relative to the second positioning shaft. At the same time, the end of the adjustment plate near the first positioning shaft is rotatably connected to the backrest connecting plate. Therefore, when the backrest connecting plate rotates, it will drive the connecting plate to move, thereby shortening the distance between the first positioning shaft and the second positioning shaft. The elastic component is compressed. When the backrest connecting plate loses external pressure, the elastic component resets, providing sufficient elastic potential energy to reset the backrest connecting plate, ultimately allowing the human body to receive sufficient seat rebound force.

[0007] The gear adjustment component drives the gear plate to rotate via an adjustment rod. The first positioning shaft, through the setting of the elastic component, is always embedded in the positioning groove opened in the gear adjustment plate. When it is necessary to adjust the elastic potential energy of the spring component to achieve different seat rebound forces for users of different body types, the gear plate is rotated by rotating the adjustment rod, so that the positioning grooves of different heights on the gear plate can be embedded and positioned with the first positioning shaft, realizing the adjustment of the distance between the first positioning shaft and the second positioning shaft, thereby adjusting the elastic potential energy of the spring component. Ultimately, this achieves continuous multi-level adjustment of the seat tray's seat rebound force, meeting the needs of users of different body types for seat rebound force, and improving the seat's applicability and comfort.

[0008] Optionally, the adjusting plate is provided with a rotating shaft at one end near the second positioning shaft, and the chair back connecting plate is provided with a rotating groove for the rotating shaft to rotate.

[0009] By adopting the above technical solution, the rotating shaft on the adjustment plate can be directly slid into the rotating groove to achieve a rotating connection during installation, which reduces the difficulty of installation and disassembly.

[0010] Optionally, the upper mounting shell has first waist-shaped holes on both sides of one end near the second positioning shaft, the two sides of the second positioning shaft pass through the first waist-shaped holes, and the shaft of the second positioning shaft is slidably connected in the first waist-shaped holes.

[0011] By adopting the above technical solution, the upper mounting shell and the backrest connecting plate achieve two-point positioning, which improves the stability of the entire structure during movement. The setting of the first waist-shaped hole enables the backrest connecting plate to compensate for the displacement that occurs when it rotates together with the upper mounting shell, thereby improving the smoothness of the overall structure during movement.

[0012] Optionally, wear-resistant tubes are sleeved at both ends of the second positioning shaft. The wear-resistant tubes include a sliding section located in the first waist-shaped hole and wear-resistant sections at both ends abutting against the inner wall of the upper mounting shell and the outer wall of the lower mounting shell, respectively.

[0013] By adopting the above technical solution, the wear-resistant tube can effectively isolate the second positioning shaft from direct contact with the lower and upper mounting shells, thereby reducing the frictional wear of the second positioning shaft caused by rotation and extending the service life of the second positioning shaft, as well as the upper and lower mounting shells.

[0014] Optionally, the spring assembly includes a first positioning rod with one end rotatably connected to the first positioning shaft, a second positioning rod with one end rotatably connected to the second positioning shaft, a connecting rod with both ends respectively inserted and sliding within the first positioning rod and the second positioning rod, and a compression elastic element sleeved and positioned on the first positioning rod and the second positioning rod.

[0015] By adopting the above technical solution, the connecting rod is inserted and slidably connected to the first and second positioning rods, ensuring that the first and second positioning rods remain connected during force adjustment and are subjected to force along the same axis, thus improving the overall stability of the spring assembly. The compression elastic element, sleeved on the first and second positioning rods, ensures that the elastic element is always subjected to force along the axial direction of the first and second positioning rods when the tray is adjusted, avoiding force attenuation caused by the elastic element's misalignment and improving the smoothness of the spring assembly adjustment.

[0016] The first positioning rod, connected to the first positioning shaft, allows the spring assembly to rotate along with the gear shift plate during adjustment, synchronously compressing or stretching the elastic element. This increases or decreases the elastic potential energy of the elastic element, thus enabling graded adjustment of the seat's rebound force by the spring assembly. The second positioning rod, rotatably connected to the second positioning shaft, better matches the rotation angle when the mounting shell rotates relative to the second positioning shaft, reducing damping. Simultaneously, it maintains the same axial force as the first positioning rod, providing stable support for the transmission of elastic force and achieving uniform force distribution.

[0017] Optionally, a gear plate is integrally provided on one side of the gear plate, and a drive gear is provided at one end of the adjusting rod to mesh with the gear plate and drive the gear plate to rotate; the lower mounting shell is provided with a second waist-shaped hole on the shell on one side of the adjusting rod for the adjusting rod to pass through and slide, and a rotating shaft is sleeved in the second waist-shaped hole on the outer wall of the adjusting rod, and the rotating shaft is fixed on the chair back connecting plate.

[0018] By adopting the above technical solution, the angle of the gear plate is adjusted by the meshing of the adjusting rod and the gear plate, thereby adjusting the positioning groove. Simultaneously, because the first positioning shaft always exerts a certain pressure on the gear plate, it prevents the gear plate and adjusting rod from rotating on their own, preventing accidental unlocking due to vibration or external force on the seat tray, thus improving the safety of the gear adjustment assembly. The adjusting rod slides within the second oblong hole via a rotating shaft, preventing positional displacement of the adjusting rod when the backrest connecting plate and the lower mounting shell rotate relative to each other, improving the stability and reliability of the gear adjustment assembly.

[0019] Optionally, the chair back connecting plate is provided with an arc-shaped positioning plate at the other end away from the mounting axis, and the arc-shaped positioning plate is provided with multiple snap-fit ​​grooves; the lower mounting shell is provided with a positioning block for inserting into the positioning groove and a pull rod assembly for controlling the positioning block to insert into or move away from the snap-fit ​​groove.

[0020] By adopting the above technical solution, an arc-shaped positioning plate is set at the other end of the backrest connecting plate away from the mounting axis. Multiple locking slots are opened on the plate body through the arc-shaped positioning plate. The locking slots provide multi-angle locking corresponding to different seat tray tilt angles. Then, by controlling the positioning block to insert or disengage from the locking slot through the pull rod assembly, the seat tray can be locked at different angles in multiple dimensions. This enables independent control, locking and releasing of the seat tilt angle, improving the applicability of the seat function.

[0021] Optionally, the pull rod assembly includes a fixed base, a fixed plate, a sliding member, and a pull rod disposed on the lower mounting shell; the fixed plate is fixed to the fixed base, and a sliding groove is formed on the fixed plate; the sliding member includes a sliding rod that slides on the sliding groove, and a torsion spring with one end connected to the sliding rod and the other end connected to the pull rod; one end of the sliding rod is connected and fixed to the positioning block, and the other end extends out and slides in the sliding groove; the middle part of the torsion spring is rotatably connected to the fixed base, the pull rod abuts and is fitted in the fixed base, and a compression spring for stretching the pull rod is sleeved on the outer wall of the pull rod.

[0022] By adopting the above technical solution, when it is necessary to control the positioning block away from the locking slot, by pulling the pull rod, the pull rod will compress the compression spring sleeved on it and pull the torsion spring. The torsion spring will then control the sliding rod to slide within the sliding slot, and the positioning block will be fixed on the sliding rod, thus achieving the sliding of the positioning block away from the locking slot. When it is necessary to control the positioning block to insert into the locking slot, simply release the pull rod. The compression spring will automatically rebound, causing the pull rod to reset, which in turn will cause the torsion spring to move the sliding rod. The sliding rod will then cause the positioning block to slide into the locking slot, achieving automatic locking. A single pull of the pull rod assembly can achieve the insertion of the positioning block into the locking slot, thereby achieving the control of the seat tilt angle.

[0023] Optionally, the lower mounting housing is provided with a first linear rod connected to the pull rod for stretching the pull rod, and the lower mounting housing is also provided with a second linear rod connected and fixed to the seat support structure for adjusting the seat height.

[0024] By adopting the above technical solution, the first linear rod is fixed in the lower mounting shell by a snap-fit. When the seat tilt angle needs to be adjusted, pulling the first linear rod transmits force to the pull rod assembly, thereby achieving graded adjustment of the seat tilt angle. Similarly, the second linear rod is connected to the seat support structure and is located in the lower mounting shell. When the seat height needs to be adjusted, pulling the second linear rod transmits force to the seat support structure, thereby adjusting the seat height. Both the first and second linear rods are existing technologies, so their working principles will not be elaborated further here. Therefore, the arrangement of the first and second linear rods enables both height and tilt angle adjustment of the seat, improving the overall user experience.

[0025] Optionally, the adjustment plate is integrally disposed on the chair back connecting plate, and the adjustment plate has an arc-shaped groove on the end face facing the spring assembly for the first positioning rod to slide.

[0026] By adopting the above technical solution: the adjustment plate is integrally set on the backrest connecting plate, which allows the first positioning rod to interact directly in the arc-shaped slide groove, thereby enabling the first positioning shaft to be embedded in the positioning groove at different heights when the gear plate is adjusted.

[0027] In summary, this application includes at least one of the following beneficial technical effects: 1. By mechanically linking the different height positioning slots of the gear adjustment component with the adjustment plate and the spring component acting on the adjustment plate, multi-level height locking is achieved. At the same time, the elastic force transmission structure ensures that the adjustment process is smooth and without jamming, thereby realizing multi-dimensional adjustment of the seat tray in terms of height, angle and support rigidity.

[0028] 2. Durability and operational precision are optimized through the sliding design of wear-resistant tubes, waist-shaped holes, and gear transmission.

[0029] 3. The angle locking of the arc-shaped positioning plate and the pull rod assembly, and the height linkage of the line connecting rod, enable the seat tray to support independent or linkage adjustment of angle and height, expanding the applicable scenarios of the seat tray. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of a seat tray backrest connecting plate in an embodiment of this application, where the tilt angle is not adjusted.

[0031] Figure 2 This is a schematic diagram of the structure of a seat tray backrest connecting plate with tilt angle adjustment in an embodiment of this application.

[0032] Figure 3 This is an exploded view of the overall structure of a seat tray according to an embodiment of this application.

[0033] Figure 4 This is a schematic diagram of the structure with the upper mounting shell removed in an embodiment of this application.

[0034] Figure 5 This is an exploded view of the spring assembly in an embodiment of this application.

[0035] Figure 6 This is an exploded view of the structure of the lower mounting shell, gear adjustment assembly, backrest connecting plate and adjustment plate in the embodiment of this application.

[0036] Figure 7 This is an embodiment of the present application. Figure 6 Cross-sectional view from top view.

[0037] Figure 8 This is an exploded view of the structure of the lower mounting shell, the pull rod assembly, the arc-shaped positioning plate, and the chair back connecting plate in the embodiment of this application.

[0038] Figure 9This is an exploded view of the tie rod assembly in an embodiment of this application.

[0039] Figure 10 This is a schematic diagram of the structure of the first linear rod and the second linear rod in the embodiments of this application.

[0040] Figure 11 This is a schematic diagram of the structure of the spring assembly, lower mounting shell, chair back connecting plate, adjustment plate and first positioning shaft in the embodiments of this application.

[0041] Explanation of reference numerals in the attached drawings: 1. Upper mounting shell; 2. Lower mounting shell; 3. Backrest connecting plate; 4. Elastic adjustment mechanism; 5. Adjustment rod; 6. First linear rod; 7. Second linear rod; 8. Insertion hole; 9. Mounting shaft; 10. Fixing shaft; 11. Seat tray; 12. Rotating shaft; 13. Adjustment plate; 14. First positioning shaft; 15. Second positioning shaft; 16. Spring assembly; 17. Gear adjustment assembly; 18. First oblong hole; 19. Wear-resistant tube; 20. Sliding section; 21. Wear-resistant section; 22. Rotating groove; 23. First positioning rod; 24. Second positioning rod; 2 5. Connecting rod; 26. Compression elastic element; 27. Rotating groove; 28. Mounting base; 29. ​​Gear plate; 30. Positioning groove; 31. Gear plate; 32. Drive gear; 33. Rotating shaft; 34. Second oblong hole; 35. Mounting plate; 36. Rotating handle; 37. Arc-shaped positioning plate; 38. Snap-fit ​​groove; 39. Positioning block; 40. Pull rod assembly; 41. Fixed base; 42. Bolt; 43. Fixed plate; 44. Sliding element; 45. Pull rod; 46. Sliding groove; 47. Sliding rod; 48. Torsion spring; 49. Compression spring; 50. Arc-shaped sliding groove. Detailed Implementation

[0042] The present application will be further described in detail below with reference to the accompanying drawings.

[0043] Example 1: Embodiment 1 of this application discloses a seat tray. (Refer to...) Figures 1 to 3 As shown, a seat tray includes an upper mounting shell 1 fixed to the bottom of the seat, a lower mounting shell 2 fixed to the top of the seat support structure, a backrest connecting plate 3 rotatably connected to the upper mounting shell 1 and the lower mounting shell 2 respectively, an elastic adjustment mechanism 4 fixed inside the lower mounting shell 2, an adjustment rod 5 for controlling the elastic adjustment mechanism 4, a first linear rod 6 for controlling the adjustment of the seat tilt angle, and a second linear rod 7 for controlling the seat height adjustment. (See reference...) Figure 3As shown, an insertion hole 8 is provided on the lower side wall of the backrest connecting plate 3. The mounting shaft 9 can be installed through the insertion hole 8 and also through the lower mounting shell 2. Therefore, the lower mounting shell 2 and the backrest connecting plate 3 are rotatably connected through the mounting shaft 9. The upper end of the backrest connecting plate 3 is preferably directly connected to the upper mounting shell 1 and the backrest connecting plate 3 by a rotatable fixed shaft 10. Thus, the upper mounting shell 1 and the lower mounting shell 2 are connected to each other through the backrest connecting plate 3 to form the seat tray 11.

[0044] Reference Figure 3 , Figure 4 As shown, the main structure of the elastic adjustment mechanism 4 is installed inside the lower mounting shell 2. The elastic adjustment mechanism 4 includes an adjustment plate 13 with a rotating shaft 12 at one end and rotatably connected to the backrest connecting plate 3, a first positioning shaft 14 fixed on the inner walls of both sides at the other end of the adjustment plate 13, a second positioning shaft 15 installed at the upper end of the lower mounting shell 2 and located at the end of the lower mounting shell 2 away from the first positioning shaft 14, a spring assembly 16 rotatably connected and fixed at both ends to the first positioning shaft 14 and the second positioning shaft 15 respectively, and a gear adjustment assembly 17 for controlling the height of the first positioning shaft 14 and the bottom of the lower mounting shell 2. The lower end of the upper mounting shell 1 has a first waist-shaped hole 18 on both sides of the second positioning shaft 15. The diameter of the first waist-shaped hole 18 is preferably 2 mm larger than the diameter of the first positioning shaft 14. The two ends of the second positioning shaft 15 are slidably installed in the first waist-shaped hole 18, and wear-resistant tubes 19 are also sleeved on the outer walls of the two ends of the second positioning shaft 15. The wear-resistant tubes 19 are divided into two sections: a sliding section 20 installed in the first waist-shaped hole 18 and a wear-resistant section 21 whose two ends abut against the inner wall of the upper mounting shell 1 and the outer wall of the lower mounting shell 2, respectively. The backrest connecting plate 3 has a rotating groove 22 on both sides of the second positioning shaft 15, which allows the rotating shaft 12 to be directly inserted and rotated. The rotating groove 22 is preferably C-shaped, so as to facilitate the rotating shaft 12 to slide into or out of the rotating groove 22, and achieve the effect of convenient installation and removal of the adjustment plate 13.

[0045] Reference Figure 5As shown, the spring assembly 16 includes a first positioning rod 23 rotatably connected at one end to a first positioning shaft 14, a second positioning rod 24 rotatably connected at one end to a second positioning shaft 15, a connecting rod 25 whose two ends are respectively inserted into and slide within the first positioning rod 23 and the second positioning rod 24, and a compression elastic element 26 sleeved on the outside of the first positioning rod 23 and the second positioning rod 24. Preferably, the first positioning rod 23 consists of two parallel rods, and one end of each first positioning rod 23 preferably has a hole for the first positioning shaft 14 to be inserted and rotated, so that the first positioning shaft 14 can both connect to the first positioning rod 23 and rotate on its own. Preferably, the second positioning rod 24 consists of two parallel rods, and one end of each second positioning rod 24 preferably has a rotating groove 27, allowing the second positioning rod 24 to fit tightly against the second positioning shaft 15 through the rotating groove 27 and to rotate relative to the second positioning shaft 15 with the second positioning shaft 15 as the center. The first positioning rod 23 and the second positioning rod 24 are preferably hollow rods. Therefore, the first positioning rod 23 and the second positioning rod 24 can be connected to form an integral structure by inserting the connecting rod 25 into them respectively. The compression elastic element 26 is sleeved on the outer wall of the integral structure.

[0046] Reference Figure 6 , Figure 7 As shown, the gear adjustment assembly 17 is first installed as a whole on the mounting shaft 9, and then fixed to the lower mounting housing 2 by both ends of the mounting shaft 9 to realize the gear adjustment assembly 17 being installed inside the lower mounting housing 2. The gear adjustment assembly 17 includes a mounting base 28 rotatably connected to the mounting shaft 9, a gear plate 29 integrally formed with the mounting base 28, positioning grooves 30 at different vertical heights on the gear plate 29 for the first positioning shaft 14 to be inserted, a gear plate 31 integrally formed with the gear plate 29 and located on one side of the gear plate 29, a drive gear 32 meshing with the gear on the gear plate 31, and an adjustment rod 5 connected to the drive gear 32 and used to drive the drive gear 32. The gear plate 29 is preferably fan-shaped, and the curvature of the positioning grooves 30 on it is just enough for the first positioning shaft 14 to be inserted. On the other hand, at the connection point between the adjusting rod 5 and the drive gear 32, a rotating shaft 33 is integrally provided on the outer wall of the adjusting rod 5. Simultaneously, a second oblong hole 34 is provided on the side wall of the lower mounting shell 2 for one end of the rotating shaft 33 to rotate and slide. When the chair back connecting plate 3 rotates relative to the lower mounting shell 2 under adjustment, the rotating shaft 33 synchronously slides up and down relative to the lower mounting shell 2 within the second oblong hole 34 to compensate for the displacement of the chair back connecting plate 3, ensuring that the adjusting rod 5 is always parallel to the mounting shaft 9. Furthermore, the other end of the rotating shaft 33 passes through the chair back connecting plate 3, and preferably, a rhomboid mounting plate 35 is used to reinforce the connection between the rotating shaft 33 and the chair back connecting plate 3. A circular rotating handle 36 is also preferably provided at the end of the adjusting rod 5 away from the rotating shaft 33, allowing the adjusting rod 5 to rotate.

[0047] Reference Figure 8 As shown, the chair back connecting plate 3 has an integrally formed arc-shaped positioning plate 37 at the end away from the mounting shaft 9. The arc-shaped positioning plate 37 preferably has the same curvature on its inner wall facing the lower mounting shell 2 as the lower mounting shell 2 at that point. The arc-shaped positioning plate 37 has several snap-fit ​​grooves 38. The lower mounting shell 2 has a positioning block 39 at the end away from the mounting shaft 9, which can be inserted and positioned within the snap-fit ​​grooves 38.

[0048] Reference Figure 8 , Figure 9 As shown, the positioning block 39 is mounted on the pull rod assembly 40, and the pull rod assembly 40 can control the positioning block 39 to be inserted into or moved away from the locking groove 38. The pull rod assembly 40 includes a fixed base 41 mounted on the lower mounting shell 2, a fixed plate 43 preferably fixed to the fixed base 41 by bolts 42, a sliding member 44 slidably connected to the fixed plate 43, and a pulling rod 45 for controlling the sliding member 44. The fixed base 41 preferably has a protrusion at its upper end for locking and fixing to the lower mounting shell 2, and the fixed plate 43 is preferably fixed by bolts 42 integrally formed with the fixed base 41. Furthermore, the fixed plate 43 has a sliding groove 46 in the middle of its body for the sliding member 44 to slide. The sliding member 44 includes a sliding rod 47 sliding in the sliding groove 46, and a torsion spring 48 with one end connected to the sliding rod 47 and the other end connected to the pulling rod 45. The torsion spring 48 is preferably sleeved and fixed to the bolt 42 integrally formed with the fixed base 41. On the other hand, the end of the torsion spring 48 connected to the sliding rod 47 is preferably set as a U-shaped connection, which can facilitate daily disassembly and maintenance. At the same time, the other end of the torsion spring 48 connected to the pull rod 45 is preferably connected by a spring spiral winding. Since the positioning block 39 is fixed on the sliding rod 47, one end of the sliding rod 47 is preferably inserted through the sliding groove 46 and fixedly connected to the positioning block 39. The pull rod 45 is preferably a T-shaped rod, wherein one end of the pull rod 45 is a T-shaped head, which abuts against the inner wall of the fixed base 41, and the other end is a rod body that is embedded and slides out of the fixed base 41. A compression spring 49 is also sleeved on the outer wall of the pull rod 45, with one end abutting against the T-shaped head of the pull rod 45 and the other end abutting against the inner wall of the fixed base 41.

[0049] Reference Figure 3 , Figure 10 As shown, a first linear rod 6 for controlling the extension of the pulling rod 45 is connected to one end of the sliding extension of the fixed base 41, and a second linear rod 7 for controlling the seat height is also provided in the lower mounting housing 2.

[0050] The implementation principle of a seat tray in this application embodiment is as follows: The seat tray provided in this application is fixed to the bottom of the seat through an upper mounting shell 1, and fixed to the support structure of the seat through a lower mounting shell 2. At the same time, the upper mounting shell 1 and the lower mounting shell 2 can be rotatably connected together through the rotational connection of the backrest connecting plate 3, and the backrest connecting plate 3 is connected and fixed to the backrest of the seat. When the seat's rebound force needs to be adjusted, firstly, the adjustment rod 5 is rotated by turning the handle 36, causing the adjustment rod 5 to rotate and drive the drive gear 32 to rotate. The drive gear 32 then drives the gear plate 32 to rotate. The gear plate 29, which is integrally set with the gear plate 31, will also be subjected to force and rotate, causing the positioning grooves 30 at different heights on the gear plate 29 to rotate. At the same time, the first positioning shaft 14 on the adjustment plate 13 will rotate and embed into the positioning groove 30 to lock the gear plate 29. Simultaneously, the spring assembly 16 connected to the first positioning shaft 14 will be subjected to force due to the first positioning shaft 14 being engaged at different heights, compressing or stretching the elastic member 26 to increase or decrease the elastic potential energy of the compressed elastic member 26, thereby adjusting the rebound force of the seat tray 11. Since one end of the upper mounting shell 1 is fixed to the backrest connecting plate 3 by the fixed shaft 10, when the backrest connecting plate 3 rotates up and down relative to the upper mounting shell 1, the second positioning shaft 15 will slide up and down in the first waist-shaped hole 18 in the upper mounting shell 1 to compensate for the displacement of the backrest connecting plate 3.

[0051] When the seat tilt angle needs to be adjusted, firstly, by pulling the first linear rod 6, the first linear rod 6 will transmit force to the pulling rod 45, causing the compression spring 49 on the pulling rod 45 to be compressed, and the torsion spring 48 to be rotated, which will pull the sliding rod 47 to slide on the fixed plate 43, so that the positioning block 39 disengages from the locking groove 38 of the arc-shaped positioning plate 37. At this time, the user can then adjust the tilt angle of the backrest connecting plate 3 by leaning back or forward using their own weight. After the tilt angle of the backrest adjustment plate 13 is adjusted, simply release the first linear rod 6, and the compression spring 49 installed on the pulling rod 45 will rebound and reset, causing the sliding part 44 to drive the positioning block 39 to slide back into the locking groove 38, thus realizing the adjustment of the seat tilt angle.

[0052] When the seat height needs to be adjusted, the seat support structure can be controlled by adjusting the second linear lever 7 to achieve the adjustment of the seat height. Since the second linear lever 7 and the seat support structure are existing technologies, they will not be explained in detail.

[0053] Example 2: The difference from Example 1 is that: Reference Figure 5 , Figure 11As shown, the adjustment plate 13 is integrally formed with the backrest connecting plate 3, and the adjustment plate 13 preferably has two arc-shaped sliding grooves 50 on the end face facing the spring assembly 16. The first positioning rod 23 is preferably provided with a pulley at the connection with the first positioning shaft 14. The pulley is fitted into the arc-shaped sliding groove 50, so that when the gear plate 29 is adjusted, the first positioning shaft 14 and the adjustment plate 13 slide relative to each other, thereby realizing the adjustment of the spring compression of the spring assembly 16.

[0054] 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 tray, characterized in that: include: The seat tray (11) includes a backrest connecting plate (3), an upper mounting shell (1) fixed to the bottom of the seat, and a lower mounting shell (2) fixed to the top of the seat support structure. The upper end of the backrest connecting plate (3) is rotatably connected to the upper mounting shell (1), and the lower end of the backrest connecting plate (3) is rotatably connected to the lower mounting shell (2) through a mounting shaft (9). The elastic adjustment mechanism (4) includes an adjustment plate (13), a spring assembly (16), a first positioning shaft (14), a second positioning shaft (15), and a gear adjustment assembly (17) for controlling the height of the first positioning shaft (14) relative to the bottom of the lower mounting shell (2). The first positioning shaft (14) is fixed at both ends to the inner walls of one side of the adjusting plate (13), and the other end of the adjusting plate (13) is rotatably connected to the backrest connecting plate (3); on the other hand, the first positioning shaft (14) can also be positioned on the backrest connecting plate (3) by sliding. The second positioning shaft (15) is rotatably positioned on the lower mounting shell (2) at both ends, and the second positioning shaft (15) is located at the other end of the lower mounting shell (2) away from the first positioning shaft (14); the second positioning shaft (15) is limited and slidably connected to the upper mounting shell (1) on both sides; The two ends of the spring assembly (16) are rotatably connected to the side walls of the first positioning shaft (14) and the second positioning shaft (15), respectively; The gear adjustment assembly (17) includes a mounting base (28) rotatably connected to the mounting shaft (9), a gear plate (29) with multiple positioning slots (30) of different heights for the first positioning shaft (14) to be inserted on the mounting base (28), and an adjustment rod (5) connected at one end to the gear plate (29) and used to control the gear plate (29) to rotate and adjust to achieve different insertion positions of the positioning slots (30) and the first positioning shaft (14) at different heights.

2. A seat tray according to claim 1, characterized in that: The adjusting plate (13) has a rotating shaft (12) at one end near the second positioning shaft (15), and the chair back connecting plate (3) has a rotating groove (22) for the rotating shaft (12) to rotate.

3. A seat tray according to claim 1, characterized in that: The upper mounting shell (1) has first waist-shaped holes (18) on both sides of one end near the second positioning shaft (15). The two sides of the second positioning shaft (15) pass through the first waist-shaped holes (18), and the shaft of the second positioning shaft (15) is slidably connected in the first waist-shaped holes (18).

4. A seat tray according to claim 3, characterized in that: The second positioning shaft (15) is fitted with wear-resistant tubes (19) at both ends. The wear-resistant tubes (19) include a sliding section (20) located in the first waist-shaped hole (18) and a wear-resistant section (21) at both ends abutting the inner wall of the upper mounting shell (1) and the outer wall of the lower mounting shell (2) respectively.

5. A seat tray according to claim 1, characterized in that: The spring assembly (16) includes a first positioning rod (23) rotatably connected at one end to the first positioning shaft (14), a second positioning rod (24) rotatably connected at one end to the second positioning shaft (15), a connecting rod (25) with both ends inserted and sliding in the first positioning rod (23) and the second positioning rod (24) respectively, and a compression elastic member (26) sleeved and positioned on the first positioning rod (23) and the second positioning rod (24).

6. A seat tray according to claim 1, characterized in that: A gear plate (31) is integrally provided on one side of the gear plate (29), and a drive gear (32) is provided at one end of the adjusting rod (5) to mesh with the gear plate (31) and drive the gear plate (31) to rotate; the lower mounting shell (2) is provided with a second waist-shaped hole (34) on the shell on one side of the adjusting rod (5) for the adjusting rod (5) to pass through and slide, and a rotating shaft (33) is sleeved in the second waist-shaped hole (34) on the outer wall of the adjusting rod (5), and the rotating shaft (33) is fixed on the chair back connecting plate (3).

7. A seat tray according to claim 1, characterized in that: The chair back connecting plate (3) has an arc-shaped positioning plate (37) at the other end away from the mounting shaft (9), and the arc-shaped positioning plate (37) has a plurality of snap-fit ​​grooves (38); the lower mounting shell (2) is provided with a positioning block (39) for inserting into the positioning groove (30) and a pull rod assembly (40) for controlling the positioning block (39) to insert into or move away from the snap-fit ​​groove (38).

8. A seat tray according to claim 7, characterized in that: The pull rod assembly (40) includes a fixed base (41), a fixed plate (43), a sliding member (44), and a pull rod (45) disposed on the lower mounting shell (2); the fixed plate (43) is fixed to the fixed base (41), and a sliding groove (46) is provided on the fixed plate (43); the sliding member (44) includes a sliding rod (47) that slides on the sliding groove (46), one end of which is connected to the sliding rod (47) and the other end is connected to A torsion spring (48) is attached to the pull rod (45); one end of the sliding rod (47) is connected and fixed to the positioning block (39), and the other end passes through and slides in the sliding groove (46); the middle part of the torsion spring (48) is rotatably connected to the fixed seat (41), the pull rod (45) abuts and is fitted in the fixed seat (41), and the outer wall of the pull rod (45) is sleeved with a compression spring (49) for stretching the pull rod (45).

9. A seat tray according to claim 8, characterized in that: The lower mounting shell (2) is provided with a first linear rod (6) connected to the pull rod (45) for stretching the pull rod (45), and the lower mounting shell (2) is also provided with a second linear rod (7) connected and fixed to the seat support structure for adjusting the seat height.

10. A seat tray according to claim 1, characterized in that: The adjustment plate (13) is integrally disposed on the backrest connecting plate (3), and the adjustment plate (13) has an arc-shaped groove (50) on the end face facing the spring assembly (16) for the first positioning rod to slide.

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