Seat backrest with angle-adjustable small table board

Abstract

The invention 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 is characterized in that 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] This invention relates to the field of vehicle seat technology, specifically a seat back with an adjustable angle small table. Background Technology

[0002] As people's living standards improve, cars have become a necessity. With the development of the social economy and the progress of science and technology, cars are becoming more and more comprehensive, providing people with a convenient and comfortable driving experience.

[0003] Currently, mass-produced vehicles only offer horizontally positioned tables, meaning the tables open horizontally in the front seat's designed location. Examples include a folding table mounted on a car seat (publication number CN115366767A) and a car seat table (publication number CN113942440A), both of which disclose the addition of small tables behind the seats, which can be opened for work and dining when needed. However, both have the following drawback: when the front passengers adjust the angle of the front seat backrest, the table angle changes accordingly, making it impossible to guarantee a horizontal position. Therefore, an adjustable table has become a much-needed product in the market. It can be adjusted to suit the second-row passengers' comfort needs by adjusting the angle of the front seats. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a seat back with an adjustable small table. The small table can be adjusted in angle and can always remain horizontal as the seat back angle is adjusted.

[0005] The technical solution of the present invention:

[0006] A seat backrest with an adjustable angle small table includes a seat back assembly, a small table, a connecting rod riveting assembly, and a ratchet mechanism. The seat back assembly and the small table are connected by the connecting rod riveting assembly. The connecting rod riveting assembly includes two left and right connecting rod assemblies and a splined 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 assembly. The two upper connecting rods have mounting holes at both ends. One end extends into a groove on the small table and is rotatably connected to it. The other end is mounted on the fixed bracket via a stepped bolt and can rotate relative to the fixed bracket. The two lower connecting rods also have mounting holes at both ends. One end extends into a groove on the small table and is rotatably connected to it. The splined shaft passes through the fixed bracket at both ends. The fixed bracket is inserted into the mounting holes at the other end of the two lower connecting rods. A metal sleeve is installed between the spline shaft and the fixed bracket. A metal locking plate is fitted on the spline shaft on the outside of the lower connecting rod. The ratchet mechanism includes a ratchet pawl, a stepped bolt, a torsion spring, and ratchet teeth. A ratchet tooth is provided on the outer side of the end of the lower connecting rod 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 mounting hole at the root of the ratchet pawl. The stepped bolt passes through the rivet bushing and connects 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 bolted to the seat back panel assembly, and the other end extends from the fixed bracket to the bottom of the upper connecting rod.

[0007] The beneficial effects of this invention are:

[0008] 1. This application designs a ratchet mechanism on the basis of a four-bar adjustable table. The ratchet unlocks when the table is raised and locks when the table is lowered, realizing multi-angle adjustment of the table. The ratchets on both sides are connected by splines to increase the edge strength of the table and avoid the problem of asynchronous meshing of the left and right ratchet teeth caused by the ratchet teeth jumping on both sides. Attached Figure Description

[0009] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0010] Figure 1 This is a schematic diagram of the seat back structure with a multi-angle adjustable small table, as per this application.

[0011] Figure 2 This is a schematic diagram of the seat back structure with a multi-angle adjustable small table, as described in this application. (Second angle)

[0012] Figure 3 This is a schematic diagram of the seat back structure with a multi-angle adjustable small table, as described in this application. (Third angle)

[0013] Figure 4 This is a schematic diagram of the seat back structure with a multi-angle adjustable small table, as described in this application. (Fourth angle)

[0014] Figure 5 This is a schematic diagram of the seat back structure with a multi-angle adjustable small table, as described in this application. (Fifth angle)

[0015] Figure 6 This is a partial structural diagram of the connecting rod riveting assembly and ratchet mechanism of this application. (The inner panel of the small table has been removed.)

[0016] Figure 7 This is a partial structural diagram of the connecting rod riveting assembly and ratchet mechanism of this application. (The inner panel of the small table has been removed.)

[0017] Figure 8 for Figure 6 Side view.

[0018] Figure 9 This is an enlarged structural diagram of the connecting rod riveting assembly and the ratchet mechanism.

[0019] Figure 10 This is an enlarged structural diagram of the connecting rod riveting assembly and the ratchet mechanism. (Second angle)

[0020] Figure 11 This is a schematic diagram of the tabletop frame structure of this application.

[0021] Figure label:

[0022] 1. Seat back panel assembly; 2. Small table; 21. Slide groove; 22. Outer panel of small table; 23. Inner panel of small table; 24. Table frame; 241. Left mounting bracket; 242. Right mounting bracket; 243. Side mounting bracket; 244. Middle support bracket; 244. Linkage 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 locking plate; 36. Ratchet pawl; 41. Step bolt; 42. Torsion spring; 43. Ratchet tooth; 44. Leaf spring fixing bracket; 351. Return leaf spring; 352. Damper; 5. Unlock button; 6. Detailed Implementation

[0023] To address the problems existing in the prior art, this application presents a seat backrest with an adjustable-angle small table. The table angle can be adjusted along with the angle of the front seat to suit the second-row passengers, thereby improving their comfort.

[0024] It should be noted that in the description of this application, terms such as "inner", "outer", "above", and "below" that indicate direction or positional relationship are based on the direction or positional relationship shown in the accompanying drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

[0025] 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.

[0026] A seat backrest with an adjustable angle tray includes a seat back assembly 1, a tray 2, a connecting rod riveting assembly 3, and a ratchet mechanism 4. The seat back assembly 1 and the tray 2 are connected by the connecting rod riveting assembly 3. The seat back assembly has a cavity for accommodating the connecting rod riveting assembly and the ratchet mechanism. A decorative cover is installed on the side facing the tray opposite the cavity. An unlocking button is installed at the upper end of the seat back assembly and the tray; pressing it allows the tray to fold open from under the seat back assembly. This unlocking button is a prior art structure; any structure that allows the tray to be opened is acceptable.

[0027] The connecting rod riveting assembly 3 includes two connecting rod assemblies (left and right) and a splined shaft 31. Each 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 back assembly 1. Both ends of the two upper connecting rods 31 have mounting holes. One end extends into a groove 21 on the small table 2 and is rotatably connected to the small table 2. The other end is mounted on the fixed bracket 34 via a stepped bolt 42 and can rotate relative to the fixed bracket. Both ends of the two lower connecting rods 33 have mounting holes. One end extends into a groove 21 on the small table and is rotatably connected to the small table. Both ends of the splined shaft 31 pass through the fixed bracket 34 and are inserted into the mounting holes at the other ends of the two lower connecting rods 33. A metal sleeve 35 is installed between the splined shaft 31 and the fixed bracket 34. A metal locking piece 36 is fitted onto the splined shaft 31 on the outer side of 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 lower connecting rod 33 has ratchet teeth 44 on its outer side at one end connected to the fixed bracket 34. The pawl end of the ratchet pawl 41 has multiple ratchet teeth 44, which engage 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 its other end is connected to the fixed bracket 34 via a nut. The ratchet pawl can rotate relative to the rivet bushing. 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. The specific connection structure of the torsion spring is as follows: the torsion spring is fitted onto the rivet bushing, one end of the torsion spring is inserted into the fixed bracket, and the other end is placed on the pawl end of the ratchet pawl below the horizontal post facing the fixed bracket. The connecting rod riveting assembly is fixed to the seat back panel assembly via a mounting bracket. The splined shaft ensures that the connecting rods on both sides rotate at the same amplitude.

[0029] One end of the return leaf spring assembly 35 is bolted to the seat back panel assembly 1, and the other end extends from the fixing bracket 34 to below the upper connecting rod 32. The return leaf spring assembly 35 includes a leaf spring fixing frame 351 and a return leaf spring 352. The leaf spring fixing frame 351 is bolted to the seat back panel assembly 1. One end of the return leaf spring 352 is inserted between the leaf spring fixing frame 351 and the seat back panel assembly 1, and the other end passes through the fixing bracket 34 and is positioned below the upper connecting rod 32. The return leaf spring is used to spring open the small table when the unlock button is pressed, so that the small table can be opened.

[0030] The small table 2 includes an outer table panel 22, an inner table panel 23, and a table frame 24. The outer and inner tables are bolted together by the table frame. The inner table panel has two elongated holes with grooves 21 inside, which connect to the table frame. The table frame 34 includes a left mounting bracket 241, a right mounting bracket 242, two side mounting brackets 243, and a central support bracket 244. The left and right mounting brackets are welded to the two side mounting brackets at both ends, and the central support brackets are bolted to the two side mounting brackets. This small table structure is more robust and facilitates connection to the upper and lower connecting rods of the connecting rod riveting assembly.

[0031] The seat backrest with adjustable angle small table in this application also includes a damper 5. The damper 5 is bolted to the table frame 34 inside the small table 2. The damper shaft 51 on one side of the damper 5 is inserted into the upper connecting rod 32 and extends into the mounting hole at one end of the small table 1, engaging with the mounting hole. The stepped bolt 45 passes through the table frame and is inserted into the shaft of the damper 51. The other end of the lower connecting rod 33 is mounted on the table frame by the stepped bolt. The lower connecting rod is provided with an anti-collision pad.

[0032] Compared to existing seatback tray tables, this invention incorporates a ratchet mechanism based on a four-bar adjustable tray table, featuring ratchet angle adjustment. The ratchet unlocks when the tray table is raised (the lower linkage actuates the ratchet pawl, unlocking both the pawl and the lower linkage), and locks when the tray table is lowered (the ratchet pawl and lower linkage lock together). This allows for multi-angle adjustment of the tray table. A spline shaft ensures synchronization of the ratchet mechanisms on both sides, and the connection between the ratchet wheels on both sides via the spline shaft increases the edge strength of the tray table. Angle adjustment is simple; raising the tray table and lowering it again completes the adjustment, making it easy to operate and expanding the usability of the second row. Applied to front seatback tray tables, the tray table angle can be adjusted in sync with the front seat adjustment.

[0033] Usage: The small table is opened by pressing the unlock button. Under the elastic force of the return leaf spring, the small table flips downwards and opens. When the front seats are adjusted backwards, the small table tilts downwards simultaneously, making it unusable for rear passengers. Using the seat back with the adjustable small table of this application, the small table can be lifted upwards. When raised to the desired height, the small table can be pressed down. When the small table is lifted, the ratchet and gear pawl of the lower linkage unlock, allowing the small table to be lifted freely. When raised to the desired height, pressing down the small table locks the ratchet and gear pawl, fixing it in place. Because the spline shaft connects the two lower linkages, the up and down movement of both sides of the small table is synchronized.

[0034] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art, inspired by this description, design similar structures and implementations to the above embodiments without departing from the technical essence of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A chair back with an adjustable angle small table, characterized in that: The device includes a seat back panel assembly, a small table, a connecting rod riveting assembly, and a ratchet mechanism. The seat back panel assembly and the small table are connected by the connecting rod riveting assembly. The connecting rod riveting assembly includes two connecting rod assemblies (left and right) and a splined shaft. Each 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. Both ends of the two upper connecting rods have mounting holes; one end extends into a groove on the small table and is rotatably connected to it, while the other end is mounted on the fixed bracket via a stepped bolt and can rotate relative to the fixed bracket. Both ends of the two lower connecting rods also have mounting holes; one end extends into a groove on the small table and is rotatably connected to it. The two ends of the splined shaft pass through the fixed bracket and insert into the two lower connecting rods. 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 fitted on the spline shaft on the outer side of the lower connecting rod; the ratchet mechanism includes a ratchet pawl, a stepped bolt, a torsion spring, and ratchet teeth. The outer side of the end of the lower connecting rod connected to the fixed bracket is provided with ratchet teeth, and the pawl end of the ratchet pawl is provided with multiple ratchet teeth. 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, and the stepped bolt passes through the rivet bushing and connects to the fixed bracket. A torsion spring is installed between the root of the ratchet pawl and the fixed bracket, with one end of the torsion spring inserted into the fixed bracket and the other end 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 extends from the fixed bracket to the bottom of the upper connecting rod.

2. The seat backrest with an adjustable angle 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 panel assembly by bolts. One end of the return leaf spring is inserted between the leaf spring fixing frame and the seat back panel assembly, and the other end of the return leaf spring passes through the fixing bracket and is placed under the upper connecting rod.

3. A seat backrest with an adjustable angle small table according to claim 1, characterized in that: The small table includes an outer table panel, an inner table panel, and a table frame. The outer table panel and the inner table panel are connected by bolts through the table frame. The inner table panel has two elongated holes with grooves inside, which are connected to the table frame.

4. A seat backrest with an adjustable angle small table according to claim 3, characterized in that: The table frame includes a left mounting bracket, a right mounting bracket, two side mounting brackets, and a middle support bracket. The left and right mounting brackets are welded to the two side mounting brackets at both ends, and multiple middle mounting brackets are connected to the two side mounting brackets by bolts.

5. A seat backrest with an adjustable angle small table according to claim 1, characterized in that: It also includes a damper, which is bolted to the table frame inside the small table. The damper shaft on one side of the damper is inserted into the mounting hole at one end of the small table by the upper connecting rod and is engaged with the mounting hole. The stepped bolt passes through the table frame and is inserted into the damper shaft. The other end of the lower connecting rod is mounted on the table frame by the stepped bolt. The lower connecting rod is equipped with a crash pad.

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