A multi-level adjustable manual table integrated into the chair back panel

Abstract

This invention belongs to the field of vehicle-mounted table technology, specifically a multi-level adjustable manual table integrated into a seat back panel. It includes a table support and a connector connecting the table support to the vehicle seat. The connector includes a linkage mounting bracket and a table fixing bracket. A first linkage and a second linkage are hinged to one side of the table fixing bracket, and the other ends of both linkages are hinged to the linkage mounting bracket. A pawl reversing block, a pawl, and a ratchet are movably mounted on the inner side of the linkage mounting bracket via a pivot. The ratchet is coaxially connected to the second linkage and fixed by a pin. This device positions itself by the contact between a partial tooth on the ratchet and the pawl, allowing the table support to maintain multiple angles with the vehicle seat after unfolding. The multi-level adjustment of the table support can adapt to different user habits, thus increasing the applicability of this device.

Description

Technical Field

[0001] This invention relates to the field of vehicle-mounted table technology, specifically a multi-level adjustable manual table integrated into the back of a seat. Background Technology

[0002] Car tray tables are typically installed behind the front seats of a car and can be used to place items such as food and laptops. These tray tables provide a stable place for passengers in the front passenger seat or back seat to place their belongings, thus keeping the car interior tidy.

[0003] Common in-car tray tables only have a single unfolding angle (i.e., fully unfolded, with the tray table perpendicular to the back of the vehicle seat). However, passengers adjust the seat angle according to their own habits, forcing the tray table to change its angle when fully unfolded, making it unsuitable for placing items. In-car tray tables with multiple angles (usually 3-4 angles) are more difficult to adjust, requiring users to use both hands. Furthermore, due to the seat's tilt, 1-2 angles become unusable. This further reduces the selectable angles between the tray table and the vehicle seat, making it difficult to meet the needs of most users.

[0004] Therefore, we propose a vehicle-mounted small table that can be operated with one hand and is adjustable in multiple levels to meet the needs of users with different viewing angles. Summary of the Invention

[0005] The purpose of this invention is to provide a multi-level adjustable manual table integrated into the seat back panel, so as to solve the problem mentioned in the background art that the existing in-vehicle small table has a limited range of selectable angles with the vehicle seat after it is unfolded.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a multi-level adjustable manual table integrated into a seat back panel, including a table support and a connector connecting the table support and the vehicle seat. The connector includes a linkage mounting bracket and a table fixing bracket. A first linkage and a second linkage are hinged to one side of the table fixing bracket, and the other ends of the first linkage and the second linkage are both hinged to the linkage mounting bracket.

[0007] The inner side of the connecting rod mounting bracket is movably mounted with a pawl reversing block, a pawl, and a ratchet via a pivot. The ratchet is coaxially connected to the second connecting rod, and the two are fixed by a pin. The inner side of the connecting rod mounting bracket is equipped with a pawl reversing block that drives the pawl, a pawl torsion spring that rotates the pawl in opposite directions, and a pawl reversing block torsion spring. The outer sides of the pawl reversing block and the pawl are provided with opposing protrusions. When the two opposing protrusions abut against each other, the pawl reversing block and the pawl stop rotating in opposite directions.

[0008] The first connecting rod and the pawl reversing block are both provided with limit protrusions on their outer sides, and the ratchet is provided with partial teeth on its outer side. When the two limit protrusions rotate toward each other and pass each other, the partial teeth on the outer side of the ratchet contact the pawl.

[0009] Preferably, the tabletop support includes an upper tabletop assembly and a lower tabletop assembly, which are detachably connected; the upper tabletop assembly has a recessed placement groove on its upper side.

[0010] Preferably, a tabletop mounting bracket and a wireless charging module are installed on the inner side of the tabletop support; a charging area is provided on the upper side of the tabletop assembly, and the charging area is located above the wireless charging module.

[0011] Preferably, there are two adapters, which are symmetrically arranged and located on both sides of the tabletop mounting bracket.

[0012] Preferably, a tabletop opening torsion spring is installed on the outer side of the tabletop fixing bracket, and the other end of the tabletop opening torsion spring is connected to the first connecting rod.

[0013] Preferably, a guide bracket is provided on the upper inner side of the connecting rod mounting bracket, and both the first connecting rod and the second connecting rod pass through the guide bracket before being hinged to the connecting rod mounting bracket.

[0014] Preferably, the distance from the connecting shaft of the pawl reversing block and the pawl hinge to the lower end of the inner wall of the guide bracket is less than the distance from the connecting shaft to the apex of the opposing protrusion.

[0015] Preferably, the adapter has a shock-absorbing component at one end near the vehicle seat; the shock-absorbing component includes an L-shaped fastener, one end of which is hinged to an intermediate connecting plate, and the other side of the intermediate connecting plate is rotatably connected to a bracket mounting plate.

[0016] The L-shaped fastener has a No. 1 shock absorber hinged to one side near the bracket mounting plate, and a shock absorber connecting rod hinged to the other end of the No. 1 shock absorber. The other end of the shock absorber connecting rod is hinged to the middle connecting plate.

[0017] The second shock absorber is hinged to one side of the bracket mounting plate, and the other end of the second shock absorber is hinged to the bracket mounting plate.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1) This device is positioned by the contact between the partial teeth on the ratchet and the pawl. There are multiple teeth on the partial teeth, and each tooth is a positioning position. By positioning at different positions, the table support can have multiple different angles between it and the vehicle seat after it is unfolded. The multi-level adjustment of the table support can adapt to the usage habits of different users, thereby increasing the number of people who can use this device.

[0020] 2) When opening and closing this device, you only need to rotate the table support component clockwise and counterclockwise with one hand. Then, the table support component drives the first and second connecting rods to rotate. The first and second connecting rods rotate, which in turn drive the pawl reversing block, pawl, and ratchet to rotate. Then, the pawl reversing block, pawl, and ratchet are used for positioning. This device can be operated with only one hand, making the adjustment of the table more convenient. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the internal structure of the tabletop assembly of the present invention;

[0023] Figure 3 This is an exploded view of the structure of the present invention;

[0024] Figure 4 This is a schematic diagram of the adapter structure of the present invention;

[0025] Figure 5 This is an exploded view of the adapter structure of the present invention;

[0026] Figure 6 This is a front view schematic diagram of the pawl reversing block, pawl, and ratchet structure of the present invention;

[0027] Figure 7 This is a schematic diagram of the shock absorption component structure of the present invention.

[0028] In the diagram: 10 Tabletop support, 11 Tabletop upper plate assembly, 12 Tabletop lower plate assembly, 13 Placement slot, 14 Charging area;

[0029] 20 Adapter, 21 Tabletop Fixing Bracket, 22 Tabletop Opening Torsion Spring, 231 Linkage 1, 232 Linkage 2, 233 Limiting Protrusion, 241 Pawl Reversing Block, 242 Pawl, 243 Ratchet, 251 Pawl Torsion Spring, 252 Pawl Reversing Block Torsion Spring, 261 Linkage Mounting Bracket, 262 Guide Bracket;

[0030] 31 Tabletop mounting bracket; 32 Wireless charging module;

[0031] 40 Shock absorber assembly, 41 L-type fastener, 42 bracket mounting plate, 43 intermediate connecting plate, 44 No. 2 shock absorber, 45 No. 1 shock absorber. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0034] Example:

[0035] Please see Figure 1-7 The present invention provides a technical solution: a multi-level adjustable manual table integrated into a chair back panel, including a table support 10 and an adapter 20. The adapter 20 is used to connect the table support 10 and the vehicle seat. The connection of the adapter 20 allows the table support 10 to have two states: closed and unfolded. When the table support 10 is closed, it is aligned with the back of the vehicle seat, saving space. When the table support 10 is unfolded, it forms an angle with the back of the vehicle seat, making it convenient for users to place items.

[0036] The adapter 20 includes a tabletop fixing bracket 21, a tabletop opening torsion spring 22, a first connecting rod 231, a second connecting rod 232, a pawl reversing block 241, a pawl 242, a ratchet 243, a pawl torsion spring 251, a pawl reversing block torsion spring 252, a connecting rod mounting bracket 261, and a guide bracket 262. The tabletop fixing bracket 21 has an installation port, which can be installed onto the shock absorption assembly 40 by bolts. The connecting rod mounting bracket 261 and the tabletop support 10 also have installation ports, which can be fixed onto the tabletop support 10 by bolts. A first connecting rod 231 and a second connecting rod 232 are hinged between the connecting rod mounting bracket 261 and the table fixing bracket 21. The two ends of the first connecting rod 231 are hinged to the connecting rod mounting bracket 261 and the table fixing bracket 21, respectively. The two ends of the second connecting rod 232 are also hinged to the connecting rod mounting bracket 261 and the table fixing bracket 21, respectively. The table fixing bracket 21, the first connecting rod 231, the second connecting rod 232 and the connecting rod mounting bracket 261 form a quadrilateral. The table fixing bracket 21 is the fixed side. By rotating the first connecting rod 231, the second connecting rod 232 and the connecting rod mounting bracket 261, the included angle between the connecting rod mounting bracket 261 and the table fixing bracket 21 changes, thereby adjusting the included angle between the table support 10 and the back of the vehicle seat, and thus unfolding the table support 10.

[0037] The control structure consists of a pawl reversing block 241, a pawl 242, a ratchet 243, a first connecting rod 231, and a second connecting rod 232. The mounting bracket 261 is U-shaped, with the pawl reversing block 241, pawl 242, and ratchet 243 all located inside the mounting bracket 261. The rotating shafts of the pawl reversing block 241 and pawl 242 are connected to the connecting rod mounting bracket 261 via bearings, and the rotating shafts of the pawl reversing block 241 and pawl 242 penetrate the inner wall of the connecting rod mounting bracket 261. The ratchet 243 is coaxially connected to the second connecting rod 232, and both have pin holes on their outer sides. A pin passes through the pin hole to connect the ratchet 243 and the second connecting rod 232 together, so that they rotate coaxially and synchronously when rotating. Pawl torsion spring 251 and pawl reversing block torsion spring 252 are sleeved on the outside of the pawl reversing block 241 shaft; the two ends of pawl torsion spring 251 are respectively connected to the outside of pawl 242 and the inner wall of connecting rod mounting bracket 261, and are used to drive pawl 242 to rotate clockwise (to... Figure 6 (Based on the reference); the two ends of the pawl reversing block torsion spring 252 are respectively connected to the outer side of the pawl reversing block 241 and the inner wall of the connecting rod mounting bracket 261, which are used to drive the pawl reversing block 241 to rotate counterclockwise (to Figure 6 (Based on).

[0038] Both the outer sides of the pawl reversing block 241 and the pawl 242 are provided with opposing protrusions. When the table support 10 is closed, the opposing protrusions of the pawl reversing block 241 and the opposing protrusions of the pawl 242 abut together, at which time the pawl reversing block 241 and the pawl 242 stop rotating in opposite directions (see...). Figure 6 To achieve this, the contact point between the opposing protrusions of the pawl reversing block 241 and the opposing protrusions of the pawl 242 is considered the contact point. The central axis of the pawl reversing block 241 is considered axis number one, and the central axis of the pawl 242 is considered axis number two. Let the distance between axis number one and axis number two be a (a>0), the distance from the contact point to axis number one be b (b>0), and the distance from the contact point to axis number two be c (c>0). a, b, and c satisfy the triangle relationship, that is, the sum of any two sides is greater than the third side. At this time, the three form a triangle, thereby stabilizing the pawl reversing block 241 and pawl 242 and ensuring that the positional relationship between the pawl reversing block 241 and pawl 242 remains unchanged under normal conditions.

[0039] Limiting protrusions 233 are provided on the outer sides of both the first connecting rod 231 and the pawl reversing block 241. When the table support 10 is opened, the first connecting rod 231 rotates counterclockwise (towards...). Figure 6 (Based on the reference), the first link 231 will drive the outer limiting protrusion 233 to rotate, and finally the outer limiting protrusion 233 of the first link 231 will be in contact with the outer limiting protrusion of the pawl reversing block 241. At this time, if the first link 231 is rotated further, the first link 231 will drive the pawl reversing block 241 to rotate clockwise through the limiting protrusion 233 (based on the reference). Figure 6 (Based on the reference), the opposing protrusions on the outer side of the pawl reversing block 241 and the opposing protrusions on the outer side of the pawl 242 finally separate, and then the pawl torsion spring 251 drives the pawl 242 to rotate clockwise (to... Figure 6 (Based on the reference). A partial tooth is provided on the outer side of the ratchet 243. Only when the ratchet 243 rotates to a set angle will the partial tooth be limited by the pawl 242, at which point the ratchet 243 can only rotate in one direction. Let the contact position between the partial tooth of the ratchet 243 and the pawl 242 be the contact point, the distance between the rotation axis of the ratchet 243 and the rotation axis of the pawl 242 be e (e > 0), the distance between the rotation axis of the ratchet 243 and the contact point be f (f > 0), and the distance between the rotation axis of the pawl 242 and the contact point be g (g > 0). e, f, and g also satisfy the triangle relationship, that is, the sum of any two sides is greater than the third side, and the triangle formed by them has stability.

[0040] When the tabletop support 10 is unfolded, rotating the first connecting rod 231 causes the limiting protrusion 233 on the first connecting rod 231 to contact the limiting protrusion 233 on the pawl reversing block 241. The first connecting rod 231 and the pawl reversing block 241 then begin to rotate in opposite directions. As the pawl reversing block 241 rotates, the opposing protrusions on the outer side of the pawl reversing block 241 also begin to rotate. When the opposing protrusions on the outer side of the pawl reversing block 241 separate from the opposing protrusions on the outer side of the pawl 242, they are subjected to the pawl torsion spring 251. Torque causes the pawl 242 to begin resetting and rotating. At this time, a portion of the teeth on the outside of the ratchet 243 contact the pawl 242. Since the pawl 242 is not restricted at this time, the ratchet 243 can still rotate in both directions. As the first link 231 continues to rotate, the limiting protrusion 233 on the first link 231 passes through the limiting protrusion 233 on the pawl reversing block 241. The limiting protrusion 233 on the first link 231 is no longer restricting the limiting protrusion 233 on the pawl reversing block 241 and is subjected to the torque of the pawl reversing block. Under the torque of spring 252, the pawl reversing block 241 resets. At this time, the opposing protrusion on the outer side of the pawl reversing block 241 presses against the upper side of the opposing protrusion on the outer side of the pawl 242. If positioning is required, rotate the second connecting rod 232 clockwise (by a small angle) (when rotating the first connecting rod 231, the second connecting rod 232 will rotate clockwise or counterclockwise synchronously with the first connecting rod 231). The second connecting rod 232 drives the pawl 242 to rotate counterclockwise through the ratchet 243, and then the outer side of the pawl reversing block 241... The opposing protrusion of the ratchet 242 abuts against the outer opposing protrusion of the pawl 242 again, and the pawl reversing block 241 limits the ratchet 242 again. At this time, the ratchet 243 can only rotate in one direction (only counterclockwise). Before rotating the second connecting rod 232 clockwise, there are multiple teeth on a part of the ratchet 243, and each tooth can be counted as a positioning position. When the ratchet 243 is positioned in different positioning positions, the angle between the table support 10 and the vehicle seat is different, thereby realizing multi-level adjustment. In use, items are placed on the unfolded table support 10, and the weight of the items prevents the table support 10 from closing. When the table support 10 needs to be closed, first put away the items on the table support 10, and then rotate the second link 232 clockwise (large angle). The second link 232 drives the pawl 242 to rotate counterclockwise through the ratchet 243. Then the outer anti-opping protrusion of the pawl 242 separates from the outer anti-opping protrusion of the pawl reversing block 241 (this process requires overcoming the work of the pawl torsion spring 251 and the pawl reversing block torsion spring 252, so a large force is required). Then the pawl reversing block 241 resets and rotates again. At this time, the outer limiting protrusion 233 of the pawl reversing block 241 will not contact the outer limiting protrusion 233 of the first link 231, and it will not interfere with the clockwise rotation of the first link 231.

[0041] The tabletop support 10 includes an upper tabletop assembly 11 and a lower tabletop assembly 12. Both the upper tabletop assembly 11 and the lower tabletop assembly 12 have bolt holes and are fixed together by bolts. The lower tabletop assembly 12 serves as a decorative panel; when the tabletop support 10 is closed, the lower tabletop assembly 12 faces outwards and is displayed to the user. The upper tabletop assembly 11 serves as a support panel, and its upper side has a recessed placement groove 13. Cylindrical items such as cups can be placed in the placement groove 13 to prevent them from falling. The inner side of the table support 10 is equipped with a table mounting bracket 31 and a wireless charging module 32. The table mounting bracket 31 is made of plastic. A charging area 14 is provided on the upper side of the table top assembly 11. The charging area 14 is located on the upper side of the wireless charging module 32. A wirelessly charging device can be placed on the upper side of the charging area 14 to wirelessly charge the device. A power interface is provided on the outer side of the table top assembly 11. The power interface is electrically connected to the wireless charging module 32 to supply external power to the wireless charging module 32.

[0042] There are two adapters 20, which are symmetrically arranged to reinforce the connection between the table support 10 and the vehicle seat. The two adapters 20 are located on both sides of the table mounting bracket 31 to increase the stability of the table support 10.

[0043] A table opening torsion spring 22 is installed on the outside of the table fixing bracket 21. The other end of the table opening torsion spring 22 is connected to the first connecting rod 231. The table opening torsion spring 22 is used to tighten the first connecting rod 231 to prevent the table support 10 from automatically opening the first connecting rod 231 while the vehicle is in motion.

[0044] A guide bracket 262 is provided on the upper inner side of the connecting rod mounting bracket 261. The guide bracket 262 is connected to the connecting rod mounting bracket 261 by bolts, and the guide bracket 262 supports and prevents the connecting rod mounting bracket 261 from undergoing inward deformation. Both the first connecting rod 231 and the second connecting rod 232 pass through the guide bracket 262 before being hinged to the connecting rod mounting bracket 261. The guide bracket 262 also has a certain guiding function to prevent the first connecting rod 231 and the second connecting rod 232 from deviating to both sides.

[0045] The distance from the hinge axis of the pawl reversing block 241 and the pawl 242 to the lower end of the inner wall of the guide bracket 262 is less than the distance from the hinge axis to the apex of the opposing protrusion. The lower end of the inner wall of the guide bracket 262 provides a limit to prevent the pawl reversing block 241 and the pawl 242 from rotating too much, thereby ensuring that the limiting protrusion 233 on the pawl reversing block 241 and the limiting protrusion 233 on the first connecting rod 231 can correspond, the opposing protrusion on the pawl reversing block 241 and the opposing protrusion on the pawl 242 can correspond, and the pawl 242 and the ratchet 243 can correspond.

[0046] Sometimes, items that are easy to spill, such as tea, are placed on the table support 10, so it is necessary to dampen it. A damping component 40 is installed between the adapter 20 and the vehicle seat to reduce the vibration amplitude when the table support 10 vibrates. The shock absorption assembly 40 includes an L-shaped fastener 41 with a through hole. The L-shaped fastener 41 can be fixed to the vehicle seat with bolts. One end of the L-shaped fastener 41 is hinged to an intermediate connecting plate 43. The intermediate connecting plate 43 can rotate slightly around its hinge point with the L-shaped fastener 41. During rotation, the distance of the intermediate connecting plate 43 in the lateral and vertical directions will change. A first shock absorber 45 (both the first shock absorber 45 and the second shock absorber 44 adopt existing technology and will not be described in detail here) is hinged to the other end of the first shock absorber 45. The other end of the shock absorber 45 is hinged to a shock-absorbing link, and the other end of the shock-absorbing link is hinged to the intermediate connecting plate 43. During the rotation of the intermediate connecting plate 43, the first shock absorber 45 will reduce the rotation amplitude of the intermediate connecting plate 43, thereby providing shock absorption in the lateral and vertical directions.

[0047] A bracket mounting plate 42 is rotatably connected to the other side of the intermediate connecting plate 43. A second shock absorber 44 is hinged to the side of the bracket mounting plate 43 closest to the bracket mounting plate 42. The other end of the second shock absorber 44 is hinged to the bracket mounting plate 42. The hinge point between the second shock absorber 44 and the bracket mounting plate 43 is offset from the connection point between the bracket mounting plate 43 and the bracket mounting plate 42. As a result, when the intermediate connecting plate 43 rotates, the distance between the two hinge points of the second shock absorber 44 will change, and the second shock absorber 44 will reduce the magnitude of this change, thereby providing shock absorption in the longitudinal and vertical directions.

[0048] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or basic characteristics. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of the invention is defined by the appended claims rather than the foregoing description. Therefore, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0049] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-level adjustable manual table integrated into a seat back panel, comprising a table support (10) and an adapter (20) connecting the table support (10) and the vehicle seat, characterized in that: The adapter (20) includes a connecting rod mounting bracket (261) and a tabletop fixing bracket (21). A first connecting rod (231) and a second connecting rod (232) are hinged to one side of the tabletop fixing bracket (21). The other ends of the first connecting rod (231) and the second connecting rod (232) are both hinged to the connecting rod mounting bracket (261). The inner side of the connecting rod mounting bracket (261) is movably mounted with a pawl reversing block (241), a pawl (242), and a ratchet (243) via a rotating shaft; the ratchet (243) is coaxially connected to the second connecting rod (232), and the two are fixed by a pin; the inner side of the connecting rod mounting bracket (261) is equipped with a pawl torsion spring (251) and a pawl reversing block torsion spring (252) that drive the pawl reversing block (241) and the pawl (242) to rotate in opposite directions; the outer sides of the pawl reversing block (241) and the pawl (242) are provided with opposing protrusions, and when the two opposing protrusions abut against each other, the pawl reversing block (241) and the pawl (242) stop rotating in opposite directions; The first connecting rod (231) and the pawl reversing block (241) are both provided with limit protrusions (233) on the outside. The ratchet (243) is provided with partial teeth on the outside. When the two limit protrusions (233) rotate towards each other and pass each other, the partial teeth on the outside of the ratchet (243) contact the pawl (242).

2. The multi-level adjustable manual table integrated into the chair back panel according to claim 1, characterized in that: The table support (10) includes a table upper plate assembly (11) and a table lower plate assembly (12), which are detachably connected; a recessed placement groove (13) is provided on the upper side of the table upper plate assembly (11).

3. The multi-level adjustable manual table integrated into the chair back panel according to claim 2, characterized in that: The inner side of the table support (10) is equipped with a table mounting bracket (31) and a wireless charging module (32); the upper side of the table top assembly (11) is provided with a charging area (14), which is located on the upper side of the wireless charging module (32).

4. A multi-level adjustable manual table integrated into a chair back panel according to claim 3, characterized in that: The number of adapters (20) is two, the two adapters (20) are symmetrically arranged, and the two adapters (20) are located on both sides of the table mounting bracket (31).

5. A multi-level adjustable manual table integrated into a chair back panel according to claim 1, characterized in that: A tabletop opening torsion spring (22) is installed on the outside of the tabletop fixing bracket (21), and the other end of the tabletop opening torsion spring (22) is connected to the first connecting rod (231).

6. A multi-level adjustable manual table integrated into a chair back panel according to claim 1, characterized in that: A guide bracket (262) is provided on the upper inner side of the connecting rod mounting bracket (261). Both the first connecting rod (231) and the second connecting rod (232) pass through the guide bracket (262) and are then hinged to the connecting rod mounting bracket (261).

7. A multi-level adjustable manual table integrated into a chair back panel according to claim 1, characterized in that: The distance from the hinge axis of the pawl reversing block (241) and the pawl (242) to the lower end of the inner wall of the guide bracket (262) is less than the distance from the hinge axis to the apex of the opposite protrusion.

8. A multi-level adjustable manual table integrated into a chair back panel according to claim 1, characterized in that: The adapter (20) has a shock-absorbing component (40) at one end near the vehicle seat; the shock-absorbing component (40) includes an L-shaped fastener (41), one end of which is hinged to an intermediate connecting plate (43), and the other side of the intermediate connecting plate (43) is rotatably connected to a bracket mounting plate (42). The L-shaped fastener (41) has a shock absorber (45) hinged on one side near the middle connecting plate (43), and a shock absorber connecting rod is hinged to the other end of the shock absorber (45), and the other end of the shock absorber connecting rod is hinged to the middle connecting plate (43). The intermediate connecting plate (43) is hinged to the second shock absorber (44) on one side near the bracket mounting plate (42), and the other end of the second shock absorber (44) is hinged to the bracket mounting plate (42).

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