Seat backrest with angle-adjustable small table board

Abstract

The utility model relates to a seat backrest with an angle-adjustable small table plate, which comprises a seat back plate assembly, a small table plate, a connecting rod riveting assembly and a ratchet mechanism, and the seat back plate assembly is connected with the small table plate through the connecting rod riveting assembly; the connecting rod riveting assembly comprises a left connecting rod assembly, a right connecting rod assembly and a spline shaft, each connecting rod assembly comprises an upper connecting rod, a lower connecting rod, a fixing support and a return plate spring assembly, and the fixing supports are fixed to the seat back plate assembly through bolts. The ratchet wheel mechanism is designed on the basis of the four-connecting-rod-adjusted table board, the ratchet wheels are unlocked when the table board is lifted up through the ratchet wheels, the ratchet wheels are locked when the table board is pressed down, multi-angle adjustment of the table board is achieved, and the ratchet wheels on the two sides are connected through the spline, so that the edge strength of the table board is improved; and the problem of asynchronous meshing of left and right ratchet teeth of the table board caused by tooth skipping on two sides of the ratchet is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle seats, and specifically relates to a seat backrest with an adjustable-angle small table board. Background Art

[0002] With the improvement of people's living standards, cars have become necessities in people's lives. With the development of social economy and the progress of technology, the functions of cars are becoming more and more comprehensive, providing people with convenient and comfortable driving experiences.

[0003] At present, mass-produced vehicle models only have a horizontal table board at the designed position, that is, the table board is horizontal when opened at the designed position of the front-row seat. For example, a folding table board installed on a car seat with the publication number CN115366767A and a car seat table board with the publication number CN113942440A both disclose adding a small table board behind the seat, which can be opened when needed for people to work and dine. However, they all have the following defects. When the front-row passenger adjusts the angle of the front-row seat backrest, the angle of the table board changes accordingly and cannot be guaranteed to be in a horizontal position. At this time, a table board with an adjustable angle has become an urgently needed product in the market, which can adjust the angle of the table board suitable for the second-row passengers along with the angle adjustment of the front-row seat, and improve the comfort requirements of the second-row passengers. Content of the Utility Model

[0004] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a seat backrest with an adjustable-angle small table board, where the small table board can adjust the angle and always remain horizontal along with the adjustment of the seat backrest angle.

[0005] The technical solution of the utility model:

[0006] A seat backrest with an adjustable-angle small table board, comprising a seat back panel assembly, a small table board, a connecting rod riveting assembly, and a ratchet mechanism. The seat back panel assembly is connected to the small table board through the connecting rod riveting assembly. The connecting rod riveting assembly includes two left and right connecting rod assemblies and a spline shaft. The connecting rod assembly includes an upper connecting rod, a lower connecting rod, a fixed bracket, and a return leaf spring assembly. The fixed bracket is bolted to the seat back panel assembly. Installation holes are provided at both ends of the two upper connecting rods. One end extends into the chute on the small table board and is rotatably connected to the small table board. The other end is installed on the fixed bracket through a step bolt and can rotate relative to the fixed bracket. Installation holes are provided at both ends of the two lower connecting rods. One end extends into the chute on the small table board and is rotatably connected to the small table board. Both ends of the spline shaft pass through the fixed bracket and are inserted into the installation holes at the other ends of the two lower connecting rods. A metal sleeve is installed between the spline shaft and the fixed bracket. A metal lock washer is sleeved on the spline shaft outside the lower connecting rod. The ratchet mechanism includes a ratchet pawl, a step bolt, a torsion spring, and ratchet teeth. Ratchet teeth are provided on the outside of the end where the lower connecting rod is connected to the fixed bracket. Multiple ratchet teeth are provided on the pawl end of the ratchet pawl. The ratchet teeth of the ratchet pawl cooperate with the ratchet teeth at the end of the lower connecting rod. A rivet bushing is installed in the installation hole at the root of the ratchet pawl. The step bolt passes through the rivet bushing and the fixed bracket for connection. A torsion spring is installed between the root of the ratchet pawl and the fixed bracket. One end of the torsion spring is inserted into the fixed bracket, and the other end is inserted into the ratchet pawl. One end of the return leaf spring assembly is bolted to the seat back panel assembly, and the other end passes through the fixed bracket and extends to the lower part of the upper connecting rod.

[0007] Advantages of the present utility model:

[0008] 1. Based on the four-link adjustable table board, a ratchet mechanism is designed in this application. When the table board is lifted, the ratchet is unlocked, and when the table board is pressed down, the ratchet is locked, realizing multi-angle adjustment of the table board. The ratchets on both sides are connected by splines, which increases the edge strength of the table board and avoids the problem that the left and right ratchet teeth of the table board are not meshed synchronously due to the ratchet teeth jumping on both sides. Description of the drawings

[0009] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0010] Figure 1 Structural schematic diagram of the seat backrest with a multi-angle adjustable small table board in this application.

[0011] Figure 2 Structural schematic diagram of the seat backrest with a multi-angle adjustable small table board in this application. (Second angle)

[0012] Figure 3 Schematic diagram of the seat back structure with a small table board adjustable at multiple angles. (Third angle)

[0013] Figure 4 Schematic diagram of the seat back structure with a small table board adjustable at multiple angles. (Fourth angle)

[0014] Figure 5 Schematic diagram of the seat back structure with a small table board adjustable at multiple angles. (Fifth angle)

[0015] Figure 6 Partial schematic diagram of the connecting rod riveting assembly and ratchet mechanism of the present application. (Removing the inner table board)

[0016] Figure 7 Partial schematic diagram of the connecting rod riveting assembly and ratchet mechanism of the present application. (Removing the inner table board)

[0017] Figure 8 is Figure 6 side view of

[0018] Figure 9 Partial enlarged schematic diagram of the connecting rod riveting assembly and ratchet mechanism

[0019] Figure 10 Partial enlarged schematic diagram of the connecting rod riveting assembly and ratchet mechanism. (Second angle)

[0020] Figure 11 Schematic diagram of the table board skeleton structure of the present application

[0021] Reference numerals:

[0022] Seat back panel assembly 1; small table board 2; chute 21; outer table board 22; inner table board 23; table board skeleton 24; left mounting bracket 241; right mounting bracket 242; side mounting bracket 243; intermediate support bracket 244; connecting rod riveting assembly 3; ratchet mechanism 4; spline shaft 31; upper connecting rod 32; lower connecting rod 33; fixed bracket 34; return leaf spring assembly 35; metal lock piece 36; ratchet pawl 41; step bolt 42; torsion spring 43; ratchet teeth 44; leaf spring fixing bracket 351; return leaf spring 352; damper 5; unlocking button 6 Detailed implementation manners

[0023] In order to solve the problems existing in the background art, the present application particularly invents a seat back with an adjustable-angle small table board, which can adjust the angle of the table board suitable for the second-row passengers along with the angle adjustment of the front-row seats, and improve the comfort requirements of the second-row passengers

[0024] It should be noted that in the description of this application, the terms "inner", "outer", "upper", "lower", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the drawings. This is only for convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to this application.

[0025] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0026] A seat backrest with an adjustable-angle small table board includes a seat backrest assembly 1, a small table board 2, a connecting rod riveting assembly 3, and a ratchet mechanism 4. The seat backrest assembly 1 is connected to the small table board 2 through the connecting rod riveting assembly 3. A receiving cavity for the connecting rod riveting assembly and the ratchet mechanism is provided on the seat backrest assembly, and a decorative cover plate is installed at a position opposite to the receiving cavity on the side facing the small table board. An unlocking button is installed at the upper ends of the seat backrest assembly and the small table board. Pressing the button can cause the small table board to flip down and open from the seat backrest assembly. The unlocking button here is a prior art structure. No matter what structure it is, as long as it can achieve opening the small table board.

[0027] The connecting rod riveting assembly 3 includes two left and right connecting rod assemblies and a spline shaft 31. The connecting rod assembly includes an upper connecting rod 32, a lower connecting rod 33, a fixed bracket 34, and a return leaf spring assembly 35. The fixed bracket 34 is bolted to the seat backrest assembly 1. Installation holes are provided at both ends of the two upper connecting rods 31. One end extends into the sliding groove 21 on the small table board 2 and is rotatably connected to the small table board 2. The other end is installed on the fixed bracket 34 through a step bolt 42 and can rotate relative to the fixed bracket. Installation holes are provided at both ends of the two lower connecting rods 33. One end extends into the sliding groove 21 on the small table board and is rotatably connected to the small table board. Both ends of the spline shaft 31 pass through the fixed bracket 34 and are inserted into the installation holes at the other ends of the two lower connecting rods 33. A metal sleeve 35 is installed between the spline shaft 31 and the fixed bracket 34, and a metal lock piece 36 is sleeved on the spline shaft 31 outside the lower connecting rod 33.

[0028] The ratchet mechanism 4 includes a ratchet pawl 41, a stepped bolt 42, a torsion spring 43 and ratchet teeth 44. The outer side of one end of the lower connecting rod 33 connected to the fixed bracket 34 is provided with ratchet teeth 44. Multiple ratchet teeth 44 are provided on the pawl end of the ratchet pawl 41. The ratchet teeth of the ratchet pawl 41 cooperate with the ratchet teeth 44 at the end of the lower connecting rod 33. A rivet bushing is installed in the mounting hole at the root of the ratchet pawl 41. The stepped bolt passes through the rivet bushing and is connected to the fixed bracket 34 through a nut at the other end. The ratchet pawl can rotate relative to the rivet bushing and the stepped bolt. A torsion spring 43 is installed between the root of the ratchet pawl 41 and the fixed bracket. One end of the torsion spring 43 is inserted into the fixed bracket 34, and the other end is inserted into the ratchet pawl 41. Specific connection structure of the torsion spring: The torsion spring is sleeved on the rivet bushing. One end of the torsion spring is inserted into the fixed bracket, and the other end is placed under the cross column on the side of the pawl end of the ratchet pawl facing the fixed bracket. The connecting rod riveting assembly is fixed on the seat backrest assembly through the fixed bracket. The spline shaft can make the rotation amplitudes of the two side connecting rods the same.

[0029] One end of the return leaf spring assembly 35 is bolted to the seat backrest assembly 1, and the other end passes through the fixed bracket 34 and extends under the upper connecting rod 32. The return leaf spring assembly 35 includes a leaf spring fixing bracket 351 and a return leaf spring 352. The leaf spring fixing bracket 351 is connected to the seat backrest assembly 1 through bolts. One end of the return leaf spring 352 is inserted between the leaf spring fixing bracket 351 and the seat backrest assembly 1, and the other end of the return leaf spring 352 passes through the fixed bracket 34 and is placed under the upper connecting rod 32. The return leaf spring is used to pop open the small table when the unlocking button is pressed when it is necessary to open the small table.

[0030] The small table 2 includes a small table outer plate 22, a small table inner plate 23 and a table plate skeleton 24. The small table outer plate and the small table inner plate are bolted through the table plate skeleton. Two long holes are opened on the small table inner plate, and slide grooves 21 are installed in the long holes. The slide grooves are connected to the table plate skeleton. The table plate skeleton 34 includes a left mounting bracket 241, a right mounting bracket 242, two side mounting brackets 243 and an intermediate support bracket 244. The two ends of the left mounting bracket and the right mounting bracket are respectively welded to the two side mounting brackets. A plurality of intermediate mounting brackets are connected to the two side mounting brackets through bolts. This small table structure is more firm and is more conducive to connecting with the upper and lower connecting rods of the connecting rod riveting assembly.

[0031] The seat backrest with an adjustable-angle small table of the present application further includes a damper 5. The damper 5 is bolted to the table plate skeleton 34 inside the small table 2. One side of the damper shaft 51 of the damper 5 is inserted into the mounting hole at one end of the upper connecting rod 32 extending into the small table 1 and is clamped with the mounting hole. The stepped bolt 45 passes through the table plate skeleton and is inserted into the damper 51 shaft; the other end of the lower connecting rod 33 is installed on the table plate skeleton through a stepped bolt; an anti-collision pad is provided on the upper surface of the lower connecting rod.

[0032] Compared with the small table on the back of the chair in the prior art, the utility model designs a ratchet mechanism based on the table adjusted by four linkages, with a ratchet angle adjustment function. The ratchet is unlocked when the small table is lifted up (the lower connecting rod moves the ratchet claw when the small table is lifted up, and the ratchet claw and the lower connecting rod are unlocked), and the ratchet is locked when the table is pressed down (the ratchet claw and the lower connecting rod are locked when the small table is pressed down), so that the table can be adjusted at multiple angles. The ratchet mechanism on both sides is synchronized by the spline shaft, and the ratchets on both sides are connected by the spline shaft to increase the edge strength of the table. The angle adjustment only needs to lift the small table and then press it down again, which is simple to operate and allows more usage scenarios for the second row. Applied to the small table on the back of the front seat, the angle of the table can be adjusted along with the front seat.

[0033] Usage process: Open the small table by pressing the unlock button, and the small table flips down and opens under the elastic force of the return leaf spring. When the front row of seats is adjusted backward, the small table tilts downward at the same time, making it impossible for the rear passengers to use the small table. When using the seat back with an adjustable angle small table in this application, you can lift the small table upward, and when it is lifted to the desired height, press the small table down again. When lifting the small table, the ratchet and gear claws of the lower connecting rod are unlocked, and the small table can be lifted up freely. When it is lifted to the desired height, press the small table down again, and the ratchet and gear claws are locked and fixed. Because the spline shaft connects the two lower connecting plates, the up and down movements of the two sides of the small table are synchronized.

[0034] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by the above and does not deviate from the technical solution of the present invention, and designs a structure and implementation similar to the technical solution based on the above implementation examples without creativity, they shall all fall within the protection scope of the present invention.

Claims

1. A seat back with an adjustable small table, characterized in that: It includes a seat back assembly, a small table, a connecting rod rivet assembly and a ratchet mechanism, the seat back assembly is connected to the small table by a connecting rod rivet assembly; the connecting rod rivet assembly includes two left and right connecting rod assemblies and a spline shaft, the connecting rod assembly includes an upper connecting rod, a lower connecting rod, a fixed bracket and a return leaf spring assembly, and the fixed bracket is bolted to the seat back assembly; both ends of the two upper connecting rods are provided with mounting holes, one end extends into the slide groove on the small table and is rotatably connected to the small table, and the other end is mounted on the fixed bracket through a step bolt and can rotate relative to the fixed bracket; both ends of the two lower connecting rods are provided with mounting holes, one end extends into the slide groove on the small table and is rotatably connected to the small table, and both ends of the spline shaft pass through the fixed bracket and are inserted into the two lower A metal sleeve is installed in the mounting hole at the other end of the connecting rod, between the spline shaft and the fixed bracket, and a metal locking plate is installed on the spline shaft on the outside of the lower connecting rod; the ratchet mechanism includes a ratchet pawl, a step bolt, a torsion spring and a ratchet, a ratchet is provided on the outside of one end of the lower connecting rod connected to the fixed bracket, a plurality of ratchets are provided on the claw end of the ratchet pawl, the ratchet teeth of the ratchet pawl cooperate with the ratchet teeth at the end of the lower connecting rod, a rivet bushing is installed in the mounting hole at the root of the ratchet pawl, the step bolt passes through the rivet bushing and is connected to the fixed bracket, a torsion spring is installed between the root of the ratchet pawl and the fixed bracket, one end of the torsion spring is inserted into the fixed bracket, and the other end is inserted into the ratchet pawl; one end of the return leaf spring assembly is connected to the seat back assembly bolt, and the other end passes through the fixed bracket to the bottom of the upper connecting rod.

2. The seat back with an adjustable small table according to claim 1, characterized in that: The return leaf spring assembly includes a leaf spring fixing frame and a return leaf spring. The leaf spring fixing frame is connected to the seat back assembly through bolts. One end of the return leaf spring is inserted between the leaf spring fixing frame and the seat back assembly, and the other end of the return leaf spring passes through the fixing bracket and is placed under the upper connecting rod.

3. The seat back with an adjustable small table according to claim 1, characterized in that: The small table top includes a small table outer plate, a small table inner plate and a table top frame, wherein the small table outer plate and the small table inner plate are connected by bolts of the table top frame, and the small table inner plate is provided with two long holes, wherein slide grooves are arranged in the long holes, and the slide grooves are connected to the table top frame.

4. The seat back with an adjustable small table according to claim 3, characterized in that: The table top frame includes a left mounting bracket, a right mounting bracket, two side mounting brackets and a middle supporting bracket. The two ends of the left mounting bracket and the right mounting bracket are respectively welded to the two side mounting brackets, and multiple middle mounting brackets are connected to the two side mounting brackets by bolts.

5. The seat back with an adjustable small table according to claim 1, characterized in that: It also includes a damper, wherein the damper bolt is fixed to the table frame in the small table, the damper shaft on one side of the damper is inserted into the mounting hole of the upper connecting rod extending into one end of the small table, and is engaged with the mounting hole, and the step bolt passes through the table frame and is inserted into the damper shaft; the other end of the lower connecting rod is installed on the table frame through the step bolt; An anti-collision pad is provided on the lower connecting rod.

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