Tilting and pitching locking chassis

Abstract

The utility model provides a tipping locking chassis which comprises a base, a base connecting piece and an adjusting assembly, and the adjusting assembly comprises a main shaft and a moving assembly. The moving assembly comprises a rail base, a first moving part and a second moving part, the first moving part can slide on the rail base up and down, the second moving part slides left and right, the second moving part is arranged on the main shaft in a sleeving mode and rotationally connected with the main shaft, and the first moving part is connected with the base connecting part through a rotating shaft. The base connecting piece can rotate in a tilting mode relative to the base to drive the moving assembly to move. The base is provided with an operation piece sliding left and right and a transmission assembly connected with the operation piece and the second moving piece. The first moving part and the second moving part are both provided with racks, and the base connecting part and the base rotate or are static through meshing and disengaging of the racks. In the left-right direction, the connecting positions of the transmission assembly, the operating piece and the second moving piece are located at the two ends of the base, although the span of the transmission assembly is increased, the transmission efficiency and the smoothness that the operating piece drives the second moving piece are effectively improved, and locking after tipping adjustment is achieved.

Description

Technical Field

[0001] This utility model relates to the field of seats, and in particular to a tilt-locking chassis. Background Technology

[0002] In modern office chairs, the chassis is an indispensable and important component. The chassis generally integrates multiple functions, such as gas spring height adjustment and backrest tilt adjustment. For office chairs of different grades, the functions and costs of the chassis used are also different. Some manufacturers design more expensive chassis with more functions for high-end office chairs, while some manufacturers choose chassis with simpler structure and functions in order to pursue lower costs.

[0003] There are some relatively flat chassis. The seat connector of this chassis is directly tilted and rotated to the base. Some also have a back connector that is linked to the seat connector. They have a simple overall structure and low cost, but they have a common problem: they cannot achieve multi-angle tilting and locking. When unlocking, the seat back can tilt, but locking can only be performed when the seat is horizontal. Users cannot keep it at a certain tilting angle.

[0004] Meanwhile, our company had previously designed an adjustment component, but this component is not compatible with the aforementioned chassis. First, the adjustment component requires space, which the flat chassis cannot support. Second, even if the space issue is resolved, the adjustment component installed directly within it cannot be smoothly adjusted by the lever and often gets stuck. Therefore, we need to make further improvements to the chassis and adjustment component. Summary of the Invention

[0005] To address the aforementioned technical problems, this utility model provides a tilt-locking chassis, including a base, a base connector, and an adjustment assembly. The adjustment assembly includes a main shaft and a motion assembly. The motion assembly can rotate and swing on the main shaft, which is connected to the base. The motion assembly has a locking structure, which is connected to an operating component on the base via a transmission assembly. When the operating component moves, the transmission assembly drives the locking structure to lock or unlock the adjustment assembly. The connection points between the transmission assembly, the operating component, and the locking structure are located at both ends of the base. Although this increases the span of the transmission assembly, it effectively improves the transmission efficiency and the smoothness of the operating component driving the locking structure, achieving locking after tilt adjustment.

[0006] The technical solution of this utility model is implemented as follows:

[0007] A tilt-locking chassis includes a base, a seat connector rotatably connected to the base, and an adjustment assembly disposed on the seat connector and the base. The adjustment assembly includes a main shaft and a motion assembly. The motion assembly is rotatably disposed on the main shaft and swings on the main shaft, which is connected to the base. The motion assembly includes a locking structure. An operating member is provided on the base and slides left and right on the base. A transmission assembly is also provided on the base. The transmission assembly is connected to the operating member and the locking structure respectively and is configured to unlock or lock the movement of the adjustment assembly when the operating member slides. In the left-right direction, the connection position between the transmission assembly and the operating member is located at one end of the base, and the connection position between the transmission assembly and the locking structure is located at the other end of the base.

[0008] The connection points between the transmission assembly, the operating component, and the locking structure are located at both ends of the base. Although this increases the span of the transmission assembly, it effectively improves the transmission efficiency and the smoothness of the operating component driving the locking structure, thus achieving locking after tilt adjustment.

[0009] Preferably, the motion assembly includes a track base, a first moving member, and a second moving member. The first moving member is slidably disposed in the track base in the vertical direction, and the second moving member is slidably disposed in the track base in the horizontal direction. The second moving member is sleeved on the main shaft and rotatably connected to the main shaft. The first moving member is rotatably connected to the seat connector via a rotating shaft. The seat connector is rotatably connected to the base along its horizontal axis. When the seat connector tilts relative to the base, it causes the first moving member to slide relative to the track base, and simultaneously causes the motion assembly to rotate on the main shaft. The transmission assembly is connected to the second moving member and the operating member respectively. The first moving member has a first rack along its length, and the second moving member has a second rack. When the operating member moves the second moving member away from the first moving member, the first rack disengages from the second rack, and the seat connector can rotate relative to the base. When the operating member moves the second moving member closer to the first moving member and the first rack meshes with the second rack, the seat connector is relatively stationary relative to the base.

[0010] The locking structure consists of the first and second racks on the first and second moving parts. The rotation of the moving components relative to the main shaft is to adjust the tilt rotation of the components to adapt to the seat connector. The sliding of the first moving part on the track seat will slide relative to the second moving part, which is necessary to achieve the effect of adjusting at different tilt positions. This, combined with the meshing of the first and second racks, achieves locking after tilt adjustment. Furthermore, in the left-right direction, the connection position between the transmission component and the operating component is located at one end of the base, and the connection position between the transmission component and the second moving part is located at the other end of the base. In other words, the transmission component spans a longer distance in the base, and the point where the operating part drives the transmission component to move is farther from the point where the transmission component drives the second moving part to move. Although this increases the span of the transmission component in the base, this setting effectively improves the transmission efficiency of the transmission component and the smoothness of the operation component driving the second moving part.

[0011] Preferably, the base is provided with a mounting post, and the transmission assembly is mounted on the mounting post. The transmission assembly includes a rotating plate, a first transmission component, and a second transmission component. Both the rotating plate and the second transmission component are rotatably mounted on the mounting post. The first transmission component is arranged in a left-right direction, with one end connected to the operating component and the other end connected to the rotating plate. One end of the second transmission component is connected to the rotating plate, and the other end is connected to the second moving component. The transmission assembly is designed to better transmit force, ensuring that the locking block can move smoothly when the operating component is pulled out, thus guaranteeing the smooth operation of locking and unlocking.

[0012] Preferably, one end of the rotating plate is rotatably connected to the mounting post, and the other end of the rotating plate faces the operating component. Both the first and second transmission components are connected to the end of the rotating plate closest to the operating component. Since the operating component slides left and right, the rotating plate is arranged roughly in the front-back direction so that when the operating component rotates, the first transmission component easily drives the rotating plate to rotate, and the first transmission component is still connected to the end of the rotating plate closest to the operating component. The second transmission component only needs to have two arms in opposite directions to connect both the rotating plate and the second moving component. Since the second moving component is located away from the connection point between the first transmission component and the operating component, and the sliding direction of the second moving component is opposite to the sliding direction of the operating component, the opposite directions of the two arms of the second transmission component also achieve this effect.

[0013] Preferably, the first transmission component is a flexible steel wire. This allows for a low-cost transmission connection between the operating component and the rotating plate.

[0014] Preferably, the second transmission component is an elastic torsion spring; a window is provided on the track seat, through which the second transmission component connects to the second moving component. The elastic torsion spring of the second transmission component can achieve the effect of extension locking. When the first rack and the second rack are not yet aligned, pulling the operating component will cause the second transmission component to deform first. After the first rack and the second rack are aligned, the second moving component will be pushed to make the first rack and the second rack mesh.

[0015] Preferably, the track base includes a first sliding track and a second sliding track that are perpendicular to each other. A first moving member and a second moving member slide within the first and second sliding tracks respectively, with the first sliding track arranged vertically and the second sliding track arranged horizontally. The first moving member is engaged with the first sliding track so that it can rotate synchronously with the track base relative to the main shaft; the second moving member is engaged with the second sliding track so that it can rotate synchronously with the track base relative to the main shaft. The engagement and limiting of the first and second moving members by the first and second sliding tracks on the track base achieves the overall linkage of the motion components, enabling the motion components to rotate together relative to the main shaft.

[0016] Preferably, the length of the first rack is greater than the length of the second rack, and the first rack is located inside the first moving member, forming a receiving groove. When the second moving member enters the receiving groove, the first rack meshes with the second rack. After the first moving member moves, the second moving member will be in different positions within the receiving groove. Even at different positions, when the second moving member enters the receiving groove, the length of the first rack is still sufficient to mesh with the second rack. The different positions of the second moving member within the receiving groove mean that the seat connector is at different tilt angles, and the first rack and second rack can always mesh, thus allowing the seat connector to remain locked at different tilt angles.

[0017] Preferably, both the first and second racks have several meshing teeth. This increases the supporting force during locking and achieves a near-stepless locking effect, while also providing a wider range of adjustable tilt angles for the seat connector.

[0018] Preferably, the base also includes a feedback spring that protrudes upwards and abuts against the operating component. The operating component has a locking groove and an unlocking groove, which are spaced apart from each other. The feedback spring selectively abuts against either the locking groove or the unlocking groove. When the feedback spring is in the unlocking groove, the first rack and second rack disengage; when the feedback spring is in the locking groove, the first rack and second rack engage. The cooperation between the feedback spring and the two grooves not only allows the user to clearly feel whether they have completed the switching of the adjustment component's state, but also ensures that the operating component will not slide arbitrarily after the state switch, thus maintaining that state.

[0019] The design starting point, concept, and beneficial effects of this utility model, which adopts the above technical solution, are as follows:

[0020] The rotation of the motion component relative to the main shaft is to adjust the tilt rotation of the component to adapt to the seat connector. The sliding of the first motion component on the track seat will slide relative to the second motion component, which is necessary to achieve the effect of adjusting at different tilt positions. This is further enhanced by the meshing of the first and second racks to achieve locking after tilt adjustment. Furthermore, in the left-right direction, the connection position between the transmission component and the operating component is located at one end of the base, and the connection position between the transmission component and the second motion component is located at the other end of the base. In other words, the transmission component spans a longer distance in the base, and the point where the operating component drives the transmission component to move is farther from the point where the transmission component drives the second motion component to move. Although this increases the span of the transmission component in the base, this setting effectively improves the transmission efficiency of the transmission component and the smoothness of the operation component driving the second motion component. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the three-dimensional structure of the chassis in Embodiment 1 of this utility model. Figure 1 ;

[0022] Figure 2 This is a schematic diagram of the three-dimensional structure of the chassis in Embodiment 1 of this utility model. Figure 2 ;

[0023] Figure 3 This is a three-dimensional structural diagram of the adjusting component in Embodiment 1 of this utility model;

[0024] Figure 4 This is an exploded view of the adjusting component in Embodiment 1 of this utility model;

[0025] Figure 5 This is a three-dimensional structural diagram of the track seat in Embodiment 1 of this utility model;

[0026] Figure 6 This is a partial cross-sectional view of the first rack and second rack separated in the adjustment assembly of Embodiment 1 of this utility model;

[0027] Figure 7 This is a three-dimensional structural diagram of the transmission component mounted on the base in Embodiment 1 of this utility model. Figure 1 ;

[0028] Figure 8 This is a three-dimensional structural diagram of the transmission component mounted on the base in Embodiment 1 of this utility model. Figure 2 ;

[0029] Figure 9 This is a three-dimensional structural diagram of the present invention in Embodiment 1, showing the feedback spring mounted on the base.

[0030] Figure 10 This is a three-dimensional structural diagram of the feedback spring in Embodiment 1 of this utility model;

[0031] Figure 11 This is a three-dimensional structural diagram of the operating component in Embodiment 1 of this utility model;

[0032] Figure 12 This is a schematic diagram of the three-dimensional structure of the chassis in Embodiment 2 of this utility model. Figure 1 ;

[0033] Figure 13 This is a schematic diagram of the three-dimensional structure of the chassis in Embodiment 2 of this utility model. Figure 2 ;

[0034] Figure 14 This is a three-dimensional structural diagram of the transmission component mounted on the base in Embodiment 2 of this utility model.

[0035] The reference numerals in the attached figures are as follows: base 1; seat connector 2; main shaft 3; track seat 4; track part 41; main body part 411; clamping part 412; first moving part 5; first rack 51; receiving groove 52; second moving part 6; second rack 61; operating part 7; locking groove 71; unlocking groove 72; rotating plate 8; first transmission part 9; second transmission part 10; mounting post 11; feedback spring 12; abutment part 121; first sliding track 14; second sliding track 15; window 16; extension seat 17; back connector 18; sliding rotation groove 19; sliding rotation shaft 20; clearance groove 21. Detailed Implementation

[0036] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0037] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0038] In the description of this utility model, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] The specific embodiments of this utility model are as follows: Example

[0040] like Figure 1-6As shown, this utility model provides a tilt-locking chassis, including a base 1, a seat connector 2 rotatably connected to the base 1, and an adjustment assembly disposed on the seat connector 2 and the base 1. The adjustment assembly includes a main shaft 3 and a motion assembly. The motion assembly is rotatably disposed on the main shaft 3 and swings on the main shaft 3, which is connected to the base 1. The motion assembly includes a track seat 4, a first motion component 5, and a second motion component 6. The first motion component 5 is slidably disposed in the track seat 4 in the vertical direction, and the second motion component 6 is slidably disposed in the track seat 4 in the horizontal direction. The second motion component 6 is sleeved on the main shaft 3 and rotatably connected to the main shaft 3. The first motion component 5 is rotatably connected to the seat connector 2 via a rotating shaft. The seat connector 2 is rotatably connected to the base 1 along its horizontal axis. When the seat connector 2 tilts relative to the base 1, it causes the first motion component 5 to slide relative to the track seat 4, while simultaneously causing the motion assembly to rotate on the main shaft 3. An operating component 7 is provided on the base 1, and the operating component 7 is slidably disposed on the base 1. A transmission assembly is also provided on the base 1, which is connected to the operating component 7 and the second moving component 6 respectively, and is configured to drive the second moving component 6 when the operating component 7 slides. The first moving component 5 has a first rack 51 along its length, and the second moving component 6 has a second rack 61. When the operating component 7 drives the second moving component 6 away from the first moving component 5, the first rack 51 disengages from the second rack 61, and the seat connector 2 can rotate relative to the base 1. When the operating component 7 drives the second moving component 6 closer to the first moving component 5 and the first rack 51 engages with the second rack 61, the seat connector 2 is relatively stationary relative to the base 1. In the left-right direction, the connection position between the transmission assembly and the operating component 7 is located at one end of the base 1, and the connection position between the transmission assembly and the second moving component 6 is located at the other end of the base 1.

[0041] The rotation of the motion component relative to the main shaft 3 is to adjust the tilt rotation of the component to adapt to the seat connector 2. The sliding of the first motion component 5 on the track seat 4 will slide relative to the second motion component 6, which is necessary to achieve the effect of adjusting at different tilt positions. This is further enhanced by the meshing of the first rack 51 and the second rack 61 to achieve locking after tilt adjustment. Furthermore, in the left-right direction, the connection position between the transmission component and the operating component 7 is located at one end of the base 1, and the connection position between the transmission component and the second motion component 6 is located at the other end of the base 1. In other words, the transmission component spans a longer distance in the base 1, and the point where the operating component 7 drives the transmission component to move is farther from the point where the transmission component drives the second motion component 6 to move. Although this increases the span of the transmission component in the base 1, this arrangement effectively improves the transmission efficiency of the transmission component and the smoothness of the movement of the second motion component 6 driven by the operating component 7.

[0042] To accommodate this chassis, the adjustment assembly is specifically arranged vertically. Furthermore, to facilitate a smooth connection between the base 1 and the adjustment assembly, a rearward extension seat 17 is provided on the base 1, and the main shaft 3 is mounted on the extension seat 17. The base 1 connects to the gas spring of the seat, and the seat connector 2 connects to the seat portion. After the chassis is installed in the seat, the distance between the gas spring and the seat portion does not increase due to the addition of the adjustment assembly; that is, the chassis does not become thicker. Because the extension seat 17 is offset from the gas spring, the adjustment assembly is also offset from the gas spring, placing them on different vertical lines. Therefore, adding the adjustment assembly does not affect the installation of the chassis or its thickness after installation.

[0043] Specifically, the track base 4 includes a first sliding track 14 and a second sliding track 15 that are perpendicular to each other. A first moving member 5 and a second moving member 6 slide within the first sliding track 14 and the second sliding track 15, respectively. The first sliding track 14 is arranged vertically, and the second sliding track 15 is arranged horizontally. The first moving member 5 is attached to the first sliding track 14 so that it can rotate synchronously with the track base 4 relative to the main shaft 3; the second moving member 6 is attached to the second sliding track 15 so that it can rotate synchronously with the track base 4 relative to the main shaft 3. The linkage of the entire motion assembly is achieved by the contact and limiting of the first moving member 5 and the second moving member 6 by the first sliding track 14 and the second sliding track 15 on the track base 4, allowing the entire motion assembly to rotate together relative to the main shaft 3. The track base 4 is composed of two symmetrical track sections 41 joined together. Each track section 41 includes a main body section 411 and a clamping section 412, with the clamping section 412 protruding forward and backward from the main body section 411. After the two track parts 41 are assembled, the main body part 411 is located on both sides of the clamping part 412. The first sliding track 14 is formed between the two clamping parts 412, and the first moving part 5 is disposed between the two clamping parts 412. The second sliding track 15 is formed in the main body part 411, and the second moving part 6 is disposed in the main body part 411.

[0044] Furthermore, such as Figure 4-6As shown, both the first rack 51 and the second rack 61 have several meshing teeth to increase the support force during locking and achieve a near-stepless locking effect, thus enriching the adjustable tilt angle of the seat connector 2. The length of the first rack 51 is greater than the length of the second rack 61, and the first rack 51 is located inside the first moving member 5, forming a receiving groove 52. When the second moving member 6 enters the receiving groove 52, the first rack 51 meshes with the second rack 61. After the first moving member 5 moves, the second moving member 6 will be in different positions in the receiving groove 52. Moreover, even in different positions, when the second moving member 6 enters the receiving groove 52, the length of the first rack 51 is still sufficient to mesh with the second rack 61. The different positions of the second moving member 6 in the receiving groove 52 mean that the seat connector 2 is at different tilt angles, and the first rack 51 and the second rack 61 can always mesh, thus enabling the seat connector 2 to remain locked at different tilt angles.

[0045] In this embodiment, the specific structure of the adjustment component will not be described in detail, but it is described in detail in our published invention applications CN202411053062.9 and CN202411053391.3.

[0046] Furthermore, the transmission component in this embodiment is more rationally designed, which can further solve the problem of uneven adjustment of the adjustment component. Specifically, as... Figure 7 , 8 As shown, a mounting post 11 is provided on the base 1, and a transmission assembly is mounted on the mounting post 11. The transmission assembly includes a rotating plate 8, a first transmission component 9, and a second transmission component 10. Both the rotating plate 8 and the second transmission component 10 are rotatably mounted on the mounting post 11. The first transmission component 9 is arranged in a left-right direction, with one end connected to the operating component 7 and the other end connected to the rotating plate 8. One end of the second transmission component 10 is connected to the rotating plate 8, and the other end is connected to the second moving component 6. The transmission assembly is designed to better transmit force, ensuring that the locking block can move smoothly when the operating component 7 is pulled out, thus guaranteeing the smooth operation of locking and unlocking.

[0047] More specifically, one end of the rotating plate 8 is rotatably connected to the mounting post 11, and the other end of the rotating plate 8 faces the operating member 7. Both the first transmission member 9 and the second transmission member 10 are connected to the end of the rotating plate 8 closest to the operating member 7. Since the operating member 7 slides left and right, the rotating plate 8 is positioned roughly in a front-back direction facing the operating member 7. When the operating member 7 rotates, the first transmission member 9 easily drives the rotating plate 8 to rotate, and the first transmission member 9 is still connected to the end of the rotating plate 8 closest to the operating member 7. The second transmission member 10 only needs to have two arms in opposite directions to connect both the rotating plate 8 and the second moving member 6. Since the second moving member 6 is located away from the connection point between the first transmission member 9 and the operating member 7, and the sliding direction of the second moving member 6 is opposite to the sliding direction of the operating member 7, the opposite directions of the two arms of the second transmission member 10 also achieve this effect. Furthermore, the mounting post 11 is located in the base 1 away from the connection point between the first transmission member 9 and the operating member 7, and is located beside the second moving member 6.

[0048] The first transmission component 9 is an elastic steel wire, which enables low-cost transmission connection between the operating component 7 and the rotating plate 8; the second transmission component 10 is an elastic torsion spring. The track portion 41 near the mounting post 11 in the track seat 4 has a window 16 on its main body 411. The second transmission component 10 passes through the window 16 and connects to the second moving component 6. The second transmission component 10, being an elastic torsion spring, achieves an extended locking effect. When the first rack 51 and the second rack 61 are not yet aligned, pulling the operating component 7 causes the second transmission component 10 to deform first. Once the first rack 51 and the second rack 61 are aligned, the second moving component 6 is pushed, causing the first rack 51 and the second rack 61 to mesh.

[0049] like Figure 9-11 As shown, a feedback spring 12 is also provided on the base 1. The feedback spring 12 protrudes upward and abuts against the operating member 7. The operating member 7 is provided with a locking groove 71 and an unlocking groove 72, which are arranged at intervals from left to right. The feedback spring 12 selectively abuts against either the locking groove 71 or the unlocking groove 72. When the feedback spring 12 is located in the unlocking groove 72, the first rack 51 disengages from the second rack 61. When the feedback spring 12 is located in the locking groove 71, the first rack 51 engages with the second rack 61. The feedback spring 12 is a spring steel wire arranged in the front-back direction. The feedback spring 12 has an abutment portion 121 located in its middle. The abutment portion 121 is slightly recessed downward and is used to abut against the locking groove 71 or the unlocking groove 72. The feedback springs 12 at both ends of the abutment portion 121 extend obliquely downward, with one end fixed to the base 1 by a screw and the other end abutting against the base 1 to allow for deformation.

[0050] The feedback spring 12, in conjunction with the two grooves, not only allows the user to clearly feel whether they have completed the switching of the adjustment component's state, but also ensures that the operating part 7 will not slide arbitrarily after the state switch, thus maintaining the state.

[0051] Example 2: The only difference between this example and Example 1 is that the chassis also includes a back connector 18.

[0052] Specifically, such as Figure 12-14 As shown, the rear end of the base 1 is also provided with a back connector 18, which tilts and rotates along the axis in the left and right direction. A sliding rotation groove 19 is provided on the back connector 18. The rear end of the seat connector 2 is provided with a sliding rotation shaft 20, which is inserted into the sliding rotation groove 19 to realize the linkage between the seat connector 2 and the back connector 18. When the seat connector 2 tilts and rotates relative to the base 1, it can drive the back connector 18 to tilt and rotate relative to the base 1.

[0053] The back connector 18 has a clearance groove 21 for clearance of the adjustment assembly.

Claims

1. A tilt and lock tray, characterized by: The base, the seat connecting piece rotatably connected to the base, and the adjusting assembly arranged on the seat connecting piece and the base; the adjusting assembly comprises a main shaft and a movement assembly, the movement assembly is rotatably arranged on the main shaft and swings on the main shaft, and the main shaft is connected to the base; the movement assembly comprises a locking structure, the base is provided with an operating piece, the operating piece is slidably arranged on the base, and the base is further provided with a transmission assembly, the transmission assembly is connected to the operating piece and the locking structure respectively, and is configured to unlock or lock the movement of the adjusting assembly when the operating piece slides; in the left-right direction, the connection position of the transmission assembly and the operating piece is located at one end of the base, and the connection position of the transmission assembly and the locking structure is located at the other end of the base.

2. The tilt-and-lock tray of claim 1, wherein: The movement assembly comprises a track seat, a first movement piece and a second movement piece, the first movement piece is slidably arranged in the track seat in the up-down direction, and the second movement piece is slidably arranged in the track seat in the left-right direction; the second movement piece is sleeved on the main shaft and is rotatably connected to the main shaft; the first movement piece is rotatably connected to the seat connecting piece through a rotating shaft; the seat connecting piece is rotatably connected to the base along the axis in the left-right direction, and when the seat connecting piece tilts relative to the base, it drives the first movement piece to slide relative to the track seat, and simultaneously makes the movement assembly rotate on the main shaft; the transmission assembly is connected to the second movement piece and the operating piece respectively; the first movement piece is provided with a first rack along the length direction thereof, and the second movement piece is provided with a second rack, when the operating piece drives the second movement piece to move away from the first movement piece, the first rack and the second rack are disengaged, and the seat connecting piece can rotate relative to the base; when the operating piece drives the second movement piece to move close to the first movement piece and the first rack and the second rack are engaged, the seat connecting piece is relatively stationary relative to the base.

3. The tilt-and-lock tray of claim 2, wherein: The base is provided with a mounting column, and the transmission assembly is arranged on the mounting column; the transmission assembly comprises a rotating sheet, a first transmission piece and a second transmission piece, the rotating sheet and the second transmission piece are both rotatably arranged on the mounting column, the first transmission piece is arranged in the left-right direction, one end of the first transmission piece is connected to the operating piece, and the other end of the first transmission piece is connected to the rotating sheet; one end of the second transmission piece is connected to the rotating sheet, and the other end of the second transmission piece is connected to the second movement piece.

4. The tilt-and-lock tray of claim 3, wherein: One end of the rotating sheet is rotatably connected to the mounting column, the other end of the rotating sheet faces the operating piece, and the first transmission piece and the second transmission piece are both connected to the end of the rotating sheet close to the operating piece.

5. The tilt-and-lock tray of claim 3, wherein: The first transmission piece is a flexible steel wire.

6. The tilt-and-lock tray of claim 3, wherein: The second transmission piece is a flexible torsion spring; the track seat is provided with a window, and the second transmission piece passes through the window to be connected to the second movement piece.

7. The tilt-and-lock tray of claim 2, wherein: The track seat comprises a first sliding track and a second sliding track perpendicular to each other, the first movement piece and the second movement piece slide in the first sliding track and the second sliding track respectively, and the first sliding track is arranged in the up-down direction and the second sliding track is arranged in the left-right direction; the first movement piece is attached to the first sliding track so that the first movement piece can rotate synchronously with the track seat relative to the main shaft; the second movement piece is attached to the second sliding track so that the second movement piece can rotate synchronously with the track seat relative to the main shaft.

8. The tilt-and-lock tray of claim 2, wherein: The first rack is longer than the second rack, and is arranged inside the first moving member and formed with a receiving groove, so that the first rack and the second rack are engaged when the second moving member enters the receiving groove.

9. The tilt-and-lock tray of claim 2, wherein: The first rack and the second rack are both provided with a plurality of engaging teeth.

10. The tilt-and-lock tray of claim 2, wherein: The base is further provided with a feedback spring which protrudes upward and abuts against the operating member; the operating member is provided with a locking groove and an unlocking groove which are arranged left and right; the feedback spring selectively abuts in the locking groove or the unlocking groove; when the feedback spring is in the unlocking groove, the first rack and the second rack are disengaged; when the feedback spring is in the locking groove, the first rack and the second rack are engaged.

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