Multi-stage adjustment manual table board integrated on chair back board

Abstract

The invention belongs to the technical field of vehicle-mounted table plates, and particularly relates to a multi-stage adjusting manual table plate integrated on a chair back plate, which comprises a table plate supporting piece and an adapting piece for connecting the table plate supporting piece with a vehicle seat, and the adapting piece comprises a connecting rod mounting bracket and a table plate fixing bracket, a first connecting rod and a second connecting rod are hinged to one side of the table plate fixing support, and the other ends of the first connecting rod and the second connecting rod are hinged to the connecting rod mounting support; a pawl reversing block, a pawl and a ratchet wheel are movably mounted on the inner side of the connecting rod mounting bracket through a rotating shaft; the ratchet wheel and the second connecting rod are coaxially connected and are fixed through a pin; local teeth on the ratchet wheel are in contact with the pawl for positioning, so that a plurality of different included angles can be formed between the table plate supporting piece and a vehicle seat after the table plate supporting piece is unfolded; and the multi-stage adjustment of the table plate supporting piece can adapt to the use habits of different users, so that the applicable crowd of the device is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle-mounted table tops, and in particular to a multi-stage adjustable manual table top integrated with a seat back panel. Background Art

[0002] The small car table is usually installed behind the front seats of the car. It can be used to place food, laptops and other items. The small table allows passengers sitting in the front passenger seat or the back seat to have a stable place to place items, thus keeping the car tidy.

[0003] Common vehicle tray tables have only a single unfolding angle when unfolded (i.e. fully unfolded, with the tray table perpendicular to the back of the vehicle seat). Passengers will adjust the vehicle seat angle according to their own habits when riding in the vehicle, which will force the angle of the tray table to change when it is fully unfolded, making it unsuitable for placing items. Vehicle tray tables with multiple angles (usually 3 to 4 angles) are difficult to adjust and require users to use both hands to adjust them. During use, due to the tilt of the seat itself, there are still 1 to 2 angles that cannot be used, which further compresses the optional angles between the vehicle tray table and the vehicle seat. That is, the small number of angle options makes it difficult to meet the usage needs of most users.

[0004] Therefore, we propose a small car table that can be operated with one hand and can be adjusted in multiple levels to meet the needs of users with different usage angles. Summary of the invention

[0005] The object of the present invention is to provide a multi-stage adjustable manual table integrated in a seat back panel, so as to solve the problem in the above-mentioned background technology that after the existing vehicle-mounted small table is unfolded, there are few optional angles between it and the vehicle seat.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a multi-level adjustable manual table integrated in a seat back panel, comprising a table support, and an adapter connecting the table support and a vehicle seat, the adapter comprising a connecting rod mounting bracket and a table fixing bracket, one side of the table fixing bracket is hinged to a No. 1 connecting rod and a No. 2 connecting rod, and the other ends of the No. 1 connecting rod and the No. 2 connecting rod are both hinged to the connecting rod mounting bracket;

[0007] A pawl reversing block, a pawl and a ratchet wheel are movably mounted on the inner side of the connecting rod mounting bracket through a rotating shaft; the ratchet wheel is coaxially connected to the second connecting rod, and the two are fixed by a pin; a pawl torsion spring and a pawl reversing block torsion spring for driving the pawl reversing block and the pawl to rotate toward each other are mounted on the inner side of the connecting rod mounting bracket; the outer sides of the pawl reversing block and the pawl are both provided with opposing protrusions, and when the two opposing protrusions abut against each other, the pawl reversing block and the pawl stop rotating toward each other;

[0008] The outer sides of the No. 1 connecting rod and the pawl reversing block are both provided with limiting protrusions, and the outer side of the ratchet wheel is provided with partial teeth. When the two limiting protrusions rotate towards each other and pass each other, the partial teeth on the outer side of the ratchet wheel contact the pawl.

[0009] Preferably, the table top support comprises a table top upper plate assembly and a table top lower plate assembly, and the table top upper plate assembly is detachably connected to the table top lower plate assembly; a concave placement groove is provided on the upper side of the table top upper plate assembly.

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

[0011] Preferably, the number of the adapters is two, the two adapters are symmetrically arranged, and the two adapters are respectively located on both sides of the table top mounting bracket.

[0012] Preferably, a table top opening torsion spring is installed on the outer side of the table top fixing bracket, and the other end of the table top opening torsion spring is connected to the No. 1 connecting rod.

[0013] Preferably, a guide bracket is provided on the upper inner side of the connecting rod mounting bracket, and the No. 1 connecting rod and the No. 2 connecting rod both pass through the guide bracket and are then hinged to the connecting rod mounting bracket.

[0014] Preferably, the distances from the connecting shafts of the pawl reversing block and the pawl hinge to the lower end of the inner wall of the guide bracket are smaller than the distances from the connecting shafts to the apex of the opposite protrusions.

[0015] Preferably, the adapter is provided with a shock absorbing assembly at one end close to the vehicle seat; the shock absorbing assembly comprises an L-shaped fixing piece, one end of the L-shaped fixing piece is hingedly connected 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 fixing piece is hingedly connected to a shock absorber No. 1 on one side close to the bracket mounting plate, the other end of the shock absorber No. 1 is hingedly connected to a shock absorbing connecting rod, and the other end of the shock absorbing connecting rod is hingedly connected to the middle connecting plate;

[0017] The support mounting plate is hinged to the No. 2 shock absorber at one side close to the support mounting plate, and the other end of the No. 2 shock absorber is hinged to the support mounting plate.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1) The device is positioned by contact between the local teeth on the ratchet and the pawl. There are multiple teeth on the local teeth, and each tooth is a positioning position. Positioning is performed through different positioning positions, so that there can be multiple angles between the table support and the vehicle seat after unfolding; the multi-level adjustment of the table support can adapt to the usage habits of different users, thereby increasing the applicable population of the device.

[0020] 2) When opening and closing the device, you only need to use one hand to rotate the table support clockwise or counterclockwise, and then the table support will drive the No. 1 connecting rod and the No. 2 connecting rod to rotate. The rotation of the No. 1 connecting rod drives the pawl reversing block, pawl, and ratchet to rotate, and then the pawl reversing block, pawl, and ratchet are used to position the device. The device can be operated with one hand, making the adjustment of the table more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It 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 upper plate assembly of the table top of the present invention;

[0023] Figure 3 It is a schematic diagram of the explosion of the structure of the present invention;

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

[0025] Figure 5 It is an exploded schematic diagram of the structure of the adapter of the present invention;

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

[0027] Figure 7 It is a schematic diagram of the structure of the shock absorbing assembly of the present invention.

[0028] In the figure: 10 table board support, 11 table board upper plate assembly, 12 table board lower plate assembly, 13 placement slot, 14 charging area;

[0029] 20 adapter, 21 table top fixing bracket, 22 table top opening torsion spring, 231 No. 1 connecting rod, 232 No. 2 connecting rod, 233 limiting protrusion, 241 ratchet reversing block, 242 ratchet, 243 ratchet, 251 ratchet torsion spring, 252 ratchet reversing block torsion spring, 261 connecting rod mounting bracket, 262 guide bracket;

[0030] 31 table mounting bracket, 32 wireless charging module;

[0031] 40 shock absorbing assembly, 41 L-type fixing part, 42 bracket mounting plate, 43 middle connecting plate, 44 No. 2 shock absorber, 45 No. 1 shock absorber. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0034] Example:

[0035] See also Figure 1-7 The present invention provides a technical solution: a multi-level adjustable manual table top integrated in a seat back panel, comprising a table top support 10 and an adapter 20, wherein the adapter 20 is used to connect the table top support 10 and the vehicle seat, and the table top support 10 has two states, namely, closed and unfolded, through the connection of the adapter 20; when the table top support 10 is closed, it is aligned with the back of the vehicle seat to save space; when the table top support 10 is unfolded, there is an angle between it and the back of the vehicle seat, which is convenient for users to place items.

[0036] The adapter 20 includes a table top fixing bracket 21, a table top opening torsion spring 22, a No. 1 connecting rod 231, a No. 2 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; wherein, a mounting opening is provided on the table top fixing bracket 21, and the table top fixing bracket 21 can be installed to the shock absorbing assembly 40 by bolts, and mounting openings are also provided on the connecting rod mounting bracket 261 and the table top support 10, and the connecting rod mounting bracket 261 can be fixed to the table top support 10 by bolts. A No. 1 connecting rod 231 and a No. 2 connecting rod 232 are hinged between the connecting rod mounting bracket 261 and the table board fixing bracket 21, and the two ends of the No. 1 connecting rod 231 are respectively hinged to the connecting rod mounting bracket 261 and the table board fixing bracket 21, and the two ends of the No. 2 connecting rod 232 are also respectively hinged to the connecting rod mounting bracket 261 and the table board fixing bracket 21; the table board fixing bracket 21, the No. 1 connecting rod 231, the No. 2 connecting rod 232 and the connecting rod mounting bracket 261 form a quadrilateral, and the table board fixing bracket 21 is a fixed side. Through the rotation of the No. 1 connecting rod 231, the No. 2 connecting rod 232 and the connecting rod mounting bracket 261, the angle between the connecting rod mounting bracket 261 and the table board fixing bracket 21 is changed, and then the angle between the table board support 10 and the back of the vehicle seat is adjusted, and then the table board support 10 is unfolded.

[0037] The pawl reversing block 241, the pawl 242, the ratchet 243, the No. 1 connecting rod 231 and the No. 2 connecting rod 232 constitute a control structure, the mounting bracket 261 is arranged in a U shape, the pawl reversing block 241, the pawl 242 and the ratchet 243 are all located on the inner side of the mounting bracket 261; the rotating shafts of the pawl reversing block 241 and the pawl 242 are connected to the connecting rod mounting bracket 261 through bearings, and the rotating shafts of the pawl reversing block 241 and the pawl 242 pass through the inner wall of the connecting rod mounting bracket 261; the ratchet 243 is coaxially connected to the No. 2 connecting rod 232, and pin holes are provided on the outer sides of both, and the ratchet 243 is connected to the No. 2 connecting rod 232 together by passing a pin through the pin hole, so that the two rotate coaxially and synchronously when rotating. The pawl torsion spring 251 and the pawl reversing block torsion spring 252 are sleeved on the outside of the rotating shaft of the pawl reversing block 241; the two ends of the pawl torsion spring 251 are respectively connected to the outside of the pawl 242 and the inner wall of the connecting rod mounting bracket 261, which is used to drive the pawl 242 to rotate clockwise (with Figure 6 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 is used to drive the pawl reversing block 241 to rotate counterclockwise (with Figure 6 as a benchmark).

[0038] The outer sides of the pawl reversing block 241 and the pawl 242 are both provided with a top protrusion. When the table support 10 is closed, the top protrusion of the pawl reversing block 241 abuts against the top protrusion of the pawl 242, and the pawl reversing block 241 and the pawl 242 stop rotating toward each other (see FIG. Figure 6 ); To achieve this purpose, the abutment between the top protrusion of the pawl reversing block 241 and the top protrusion of the pawl 242 is regarded as the abutment point, the central axis of the rotating shaft of the pawl reversing block 241 is regarded as the first axis, and the central axis of the rotating shaft of the pawl 242 is regarded as the second axis; let the distance between the first axis and the second axis be a (a>0), the distance from the abutment point to the first axis be b (b>0), and the distance from the abutment point to the second axis be c (c>0), a, b, and c satisfy the relationship between the three sides of the triangle, 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 the pawl 242, ensuring that the positional relationship between the pawl reversing block 241 and the pawl 242 remains unchanged under normal conditions.

[0039] The outer sides of the No. 1 connecting rod 231 and the pawl reversing block 241 are both provided with a limiting protrusion 233. When the table support 10 is opened, the No. 1 connecting rod 231 rotates counterclockwise (in Figure 6 As a reference), the No. 1 connecting rod 231 will drive the limiting protrusion 233 on its outer side to rotate, and finally the limiting protrusion 233 on the outer side of the No. 1 connecting rod 231 will fit with the limiting protrusion on the outer side of the pawl reversing block 241. At this time, the No. 1 connecting rod 231 continues to rotate, and the No. 1 connecting rod 231 will drive the pawl reversing block 241 to rotate clockwise (based on the limiting protrusion 233). Figure 6 As a reference), the top protrusion on the outer side of the pawl reversing block 241 and the top protrusion on the outer side of the pawl 242 are finally separated, and then the pawl torsion spring 251 drives the pawl 242 to rotate clockwise (based on Figure 6 As a reference). The ratchet 243 is provided with partial teeth on the outside. Only when the ratchet 243 rotates to a set angle, the partial teeth will be limited by the pawl 242. At this time, the ratchet 243 can only rotate in one direction. Let the contact position between the partial teeth of the ratchet 243 and the pawl 242 be the contact point, the distance between the rotating shaft of the ratchet 243 and the rotating shaft of the pawl 242 be e (e>0), the distance between the rotating shaft of the ratchet 243 and the contact point be f (f>0), and the distance between the rotating shaft of the pawl 242 and the contact point be g (g>0). e, f, and g also satisfy the relationship between the three sides of the triangle, that is, the sum of any two sides is greater than the third side, and the triangle formed by them is stable.

[0040] When the table support 10 is unfolded, the No. 1 connecting rod 231 is rotated, and the limiting protrusion 233 on the No. 1 connecting rod 231 contacts the limiting protrusion 233 on the pawl reversing block 241, and the No. 1 connecting rod 231 and the pawl reversing block 241 begin to rotate toward each other; as the pawl reversing block 241 rotates, the top protrusion on the outside of the pawl reversing block 241 also begins to rotate. When the top protrusion on the outside of the pawl reversing block 241 separates from the top protrusion on the outside of the pawl 242, the pawl torsion spring 251 is activated. The pawl 242 starts to return to its original position due to the torque. At this time, the partial teeth on the outside of the ratchet wheel 243 come into contact with the pawl 242. Since the pawl 242 is not limited at this time, the ratchet wheel 243 can still rotate in both directions. As the No. 1 connecting rod 231 continues to rotate, the limiting protrusion 233 on the No. 1 connecting rod 231 passes through the limiting protrusion 233 on the pawl reversing block 241. The limiting protrusion 233 on the No. 1 connecting rod 231 no longer limits the limiting protrusion 233 on the pawl reversing block 241, and is affected by the torque of the pawl reversing block. The torsion force of spring 252 causes the pawl reversing block 241 to reset. At this time, the top protrusion on the outside of the pawl reversing block 241 presses on the upper side of the top protrusion on the outside of the pawl 242. If positioning is required, the second connecting rod 232 is rotated clockwise (slightly) (when the first connecting rod 231 is rotated, 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 wheel 243, and then the outer side of the pawl reversing block 241 is The top protrusion of the ratchet 242 contacts the outer top protrusion of the ratchet 242 again, and the ratchet reversing block 241 limits the ratchet 242 again. At this time, the ratchet 243 can only rotate in one direction (counterclockwise); before the second connecting rod 232 is rotated clockwise, there are multiple teeth on the local teeth of the ratchet 243, and each tooth can be regarded as a positioning position. When the ratchet 243 is positioned at different positioning positions, the angle between the table support 10 and the vehicle seat is different, thereby realizing multi-level adjustment. When in use, objects will be placed on the unfolded table support 10, and the gravity of the objects will prevent the table support 10 from closing. When it is necessary to close the table support 10, first put away the items on the table support 10, and then rotate the No. 2 connecting rod 232 clockwise (at a large angle), and the No. 2 connecting rod 232 drives the pawl 242 to rotate counterclockwise through the ratchet 243, and then the outer top protrusions of the pawl 242 are separated from the outer top protrusions of the pawl reversing block 241 (this process needs to overcome the work of the pawl torsion spring 251 and the pawl reversing block torsion spring 252, so it requires a large force), and then the pawl reversing block 241 is reset and rotated again. At this time, the limiting protrusion 233 on the outer side of the pawl reversing block 241 will not contact the limiting protrusion 233 on the outer side of the No. 1 connecting rod 231, and it will not interfere with the clockwise rotation of the No. 1 connecting rod 231.

[0041] The table support 10 includes a table upper plate assembly 11 and a table lower plate assembly 12. Bolt holes are provided on the table upper plate assembly 11 and the table lower plate assembly 12. The table upper plate assembly 11 and the table lower plate assembly 12 are fixed by bolts. The table lower plate assembly 12 is used as a decorative plate. After the table support 10 is closed, the table lower plate assembly 12 is exposed to the outside and displayed to the user. The table upper plate assembly 11 is used as a support plate. The upper side of the table upper plate assembly 11 is provided with a concave placement groove 13. Cylindrical objects such as water cups can be placed in the placement groove 13 to prevent them from falling. A table top mounting bracket 31 and a wireless charging module 32 are installed on the inner side of the table top support 10; the table top mounting bracket 31 is made of plastic material, and a charging area 14 is arranged on the upper side of the table top upper panel assembly 11, and the charging area 14 is located on the upper side of the wireless charging module 32. A device that can be wirelessly charged is placed on the upper side of the charging area 14, and the device can be wirelessly charged; a power port is arranged on the outer side of the table top upper panel assembly 11, and the power port is electrically connected to the wireless charging module 32, and is used to send external power to the wireless charging module 32.

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

[0043] A table top opening torsion spring 22 is installed on the outer side of the table top fixing bracket 21, and the other end of the table top opening torsion spring 22 is connected to the No. 1 connecting rod 231. The table top opening torsion spring 22 is used to tighten the No. 1 connecting rod 231 to prevent the table top support 10 from driving the No. 1 connecting rod 231 to open automatically when the vehicle is driving.

[0044] A guide bracket 262 is provided on the inner upper side of the connecting rod mounting bracket 261, and the guide bracket 262 is connected to the connecting rod mounting bracket 261 by bolts, and the connecting rod mounting bracket 261 is supported by the guide bracket 262 to prevent the connecting rod mounting bracket 261 from being deformed inward. The first connecting rod 231 and the second connecting rod 232 both pass through the guide bracket 262 and are then 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 deflecting to both sides.

[0045] The distances from the hinge axes of the pawl reversing block 241 and the pawl 242 to the lower end of the inner wall of the guide bracket 262 are smaller than the distances from the hinge axes to the apex of their opposing protrusions; the lower end of the inner wall of the guide bracket 262 is limited 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 of the No. 1 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 wheel 243 can correspond.

[0046] Sometimes, items that are easy to spill, such as tea, are placed on the table support 10, so it needs to be shock-absorbing. A shock-absorbing component 40 is set between the adapter 20 and the vehicle seat to reduce the vibration amplitude of the table support 10 when it vibrates. The shock absorbing assembly 40 includes an L-shaped fixing part 41, which is provided with a through hole. The L-shaped fixing part 41 can be fixed to the vehicle seat by bolts. One end of the L-shaped fixing part 41 is hinged with an intermediate connecting plate 43, and the intermediate connecting plate 43 can rotate slightly around the hinge point between it and the L-shaped fixing part 41. During the rotation, the distance of the intermediate connecting plate 43 in the lateral and vertical directions will change; the L-shaped fixing part 41 is hinged with a shock absorber No. 1 45 on one side close to the bracket mounting plate 43 (shock absorber No. 1 45 and shock absorber No. 2 44 both adopt existing technology and are not described here), and the other end of the shock absorber No. 1 45 is hinged with a shock absorbing connecting rod, and the other end of the shock absorbing connecting rod is hinged to the intermediate connecting plate 43. During the rotation of the intermediate connecting plate 43, the shock absorber No. 1 45 will reduce the rotation amplitude of the intermediate connecting plate 43, thereby performing shock absorption in the lateral and vertical directions.

[0047] The other side of the middle connecting plate 43 is rotatably connected to the bracket mounting plate 42, and the bracket mounting plate 43 is hinged to the No. 2 shock absorber 44 on the side close to the bracket mounting plate 42, and the other end of the No. 2 shock absorber 44 is hinged to the bracket mounting plate 42; the hinge point between the No. 2 shock absorber 44 and the bracket mounting plate 43 deviates from the connection point between the bracket mounting plate 43 and the bracket mounting plate 42, so that when the middle connecting plate 43 rotates, the distance between the hinge points at both ends of the No. 2 shock absorber 44 will change, and the No. 2 shock absorber 44 will reduce the amplitude of the change, thereby performing shock absorption in the longitudinal and vertical directions.

[0048] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention; therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the attached claims rather than the above description. Therefore, it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present invention, and any figure marks in the claims should not be regarded as limiting the claims involved.

[0049] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention 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 a vehicle seat, characterized in that: The adapter (20) comprises a connecting rod mounting bracket (261) and a table top fixing bracket (21), wherein a first connecting rod (231) and a second connecting rod (232) are hingedly connected to one side of the table top fixing bracket (21), and the other ends of the first connecting rod (231) and the second connecting rod (232) are both hingedly connected to the connecting rod mounting bracket (261); A pawl reversing block (241), a pawl (242) and a ratchet wheel (243) are movably mounted on the inner side of the connecting rod mounting bracket (261) via a rotating shaft; the ratchet wheel (243) is coaxially connected to the second connecting rod (232), and the two are fixed by a pin; a pawl torsion spring (251) and a pawl reversing block torsion spring (252) for driving the pawl reversing block (241) and the pawl (242) to rotate towards each other are mounted on the inner side of the connecting rod mounting bracket (261); the outer sides of the pawl reversing block (241) and the pawl (242) are both provided with opposite protrusions, and when the two opposite protrusions abut against each other, the pawl reversing block (241) and the pawl (242) stop rotating towards each other; The outer sides of the No. 1 connecting rod (231) and the ratchet pawl reversing block (241) are both provided with limiting protrusions (233), and the outer side of the ratchet wheel (243) is provided with partial teeth. When the two limiting protrusions (233) rotate towards each other and pass each other, the partial teeth on the outer side of the ratchet wheel (243) contact the ratchet pawl (242).

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

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

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

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

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

7. The multi-level adjustable manual table top integrated into the chair back panel according to claim 1, characterized in that: The distances from the hinge axes of the ratchet reversing block (241) and the ratchet (242) to the lower end of the inner wall of the guide bracket (262) are both smaller than the distances from the hinge axes to the apex of the opposite protrusions.

8. The multi-level adjustable manual table top integrated into the chair back panel according to claim 1, characterized in that: The adapter (20) is provided with a shock absorbing assembly (40) at one end close to the vehicle seat; the shock absorbing assembly (40) comprises an L-shaped fixing member (41), one end of the L-shaped fixing member (41) is hingedly connected 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 fixing member (41) is hingedly connected to a first shock absorber (45) at one side close to the bracket mounting plate (43), and the other end of the first shock absorber (45) is hingedly connected to a shock absorbing connecting rod, and the other end of the shock absorbing connecting rod is hingedly connected to the middle connecting plate (43); The support mounting plate (43) is hingedly connected to a second shock absorber (44) at one side close to the support mounting plate (42), and the other end of the second shock absorber (44) is hingedly connected to the support mounting plate (42).

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