Table plate connecting rod mechanism with forward leaning posture as initial design position and table plate assembly

Abstract

The utility model discloses a table plate connecting rod mechanism and a table plate assembly using a forward leaning posture as an initial design position, the table plate connecting rod mechanism comprises a left connecting rod mechanism and a right connecting rod mechanism, the left connecting rod mechanism and the right connecting rod mechanism comprise connecting rod supports, upper connecting rods and lower connecting rods, the connecting rod supports are fixedly connected with a chair back framework, and one side, facing the lower connecting rods, of each upper connecting rod is provided with a concave avoiding structure; the table plate assembly comprises a table plate framework and a table plate angle adjusting mechanism; the table plate framework is rotationally connected with the upper connecting rod through a shaft pin; the table plate angle adjusting mechanism comprises a rotating shaft and an angle adjuster; the angle adjuster can be locked or unlocked with the rotating shaft at multi-angle positions, the rotating shaft is arranged below the upper connecting rod, and the two ends of the rotating shaft are rotationally connected with the lower connecting rod. According to the connecting rod mechanism, the forward leaning posture of the seat backrest serves as the initial design position, when the connecting rod mechanism is matched with a table plate angle adjusting mechanism, table plate angle leveling within the range of most angles of forward leaning and backward leaning of the seat backrest can be achieved, and the applicability of a table plate is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle seats and can be applied to the fields of high-speed rail and aviation seats. Specifically, it relates to the design of a table link mechanism and a table assembly with a forward tilt posture as the initial design position. Background Art

[0002] After the angle of the seat back of a traditional seat with a small table is adjusted forward, since there is a design vertex in the small table link mechanism on the seat back, at this time the table is in an upward tilt posture. Because the table is not in a horizontal posture, it is very difficult to place items on it, resulting in the table function being almost invalid. In addition, in the face of the rapid development of science and technology, especially in the fields of adjustable seats and zero-gravity seats, the adjustment of the seat back angle has become a more and more common requirement. It is becoming more and more urgent to have a table design solution that can continue to meet the usage requirements under various working conditions of the seat back at multiple angles.

[0003] To solve this technical problem, the applicant designed a new type of seat back table structure that can achieve multi-angle hovering (application numbers: 2024111515842 and 2024220321339). This seat back table structure can achieve multi-angle table leveling. However, since this seat back table is designed with the rear tilt angle as the initial position, the upper link of the table link mechanism is an L-shaped structure. In the initial position, the lower end of the upper link contacts the upper end of the lower link. This structure can only adjust the angle of the seat back backward relative to the initial position. When the seat back needs to tilt forward, the table link mechanism cannot continue to adjust the angle due to interference between the upper link and the lower link, making the table almost unusable. Therefore, it is necessary to design a table angle leveling solution that can achieve the table angle leveling within a large range of angles from forward tilt to backward tilt of the seat back. Summary of the Utility Model

[0004] In view of the above technical problems and defects, the purpose of the utility model is to provide a table link mechanism with a forward tilt posture as the initial design position. This link mechanism takes the forward tilt posture of the seat back as the initial design position. When cooperating with the table angle adjustment mechanism, it can achieve the table angle leveling within a large range of angles from forward tilt to backward tilt of the seat back, ensuring the applicability of the table.

[0005] To achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A table plate linkage mechanism with a forward-tilted posture as the initial design position, comprising a left linkage mechanism and a right linkage mechanism. The left and right linkage mechanisms each include a linkage bracket, an upper linkage rod, and a lower linkage rod. The linkage bracket is fixedly connected to the backrest frame. One end of the upper linkage rod is rotatably connected to the linkage bracket, and the other end is rotatably connected to the table plate assembly. One end of the lower linkage rod is rotatably connected to the linkage bracket, and the other end is rotatably connected to the table plate assembly. The improvement made is that: on the side of the upper linkage rod facing the lower linkage rod, there is an inwardly concave avoidance structure, and when the backrest frame is in the forward-tilted posture, there is a gap between the upper linkage rod and the lower linkage rod. The table plate assembly includes a table plate frame and a table plate angle adjustment mechanism. The two side arms of the table plate frame are respectively rotatably connected to the upper linkage rods on the left and right sides. The table plate angle adjustment mechanism includes a rotating shaft and an angle adjuster connected to the rotating shaft and fixedly connected to the table plate frame. The angle adjuster can be locked or unlocked with the rotating shaft at multiple angular positions. The rotating shaft is arranged below the upper linkage rod and is rotatably connected to the lower linkage rods on the left and right sides at both ends. The table plate linkage mechanism and the table plate angle adjustment mechanism are used in cooperation. When the backrest tilts forward or backward, the table plate linkage mechanism can meet the support requirements, and at the same time, the table plate plane can be adjusted to an angle that meets the use requirements through the table plate angle adjustment mechanism.

[0007] As a preference of the present utility model, the upper and lower linkage rods are connected to the linkage bracket by riveting, and rivet bushings are provided in the connection holes of the upper and lower linkage rods. Both ends of the rotating shaft are fixedly connected to two connecting shafts, and a stepped connecting pin is provided at the other end of the connecting shaft. The stepped connecting pin is inserted into the end of the connection hole of the lower linkage rod and fastened by a nut.

[0008] The present utility model also provides a table plate assembly with a forward-tilted posture as the initial design position. The table plate assembly includes a table plate frame, a table plate upper shell, a table plate lower shell, the above-mentioned table plate linkage mechanism, and a table plate angle adjustment mechanism. Among them, the table plate upper shell and the table plate lower shell are arranged on the upper and lower sides of the table plate frame. The table plate linkage mechanism and the table plate angle adjustment mechanism cooperate to support and flip the table plate. The table plate angle adjustment mechanism is used to adjust the table plate at multiple angles.

[0009] As a preference of the present utility model, the angle adjuster on the table plate angle adjustment mechanism includes a housing, a first gear arranged on the rotating shaft, a transmission part connected to the first gear, a large claw connected to the transmission part and used to limit the movement of the transmission part, a knob connected to the large claw, a lever connected to the knob, and a button connected to the lever. The transmission part includes a ratchet wheel. The large claw is provided with teeth meshing with the ratchet wheel. The knob is formed with a first plane and a first arc surface. When the first plane contacts the bottom surface of the large claw, the large claw meshes with the ratchet wheel. When the first arc surface contacts the bottom surface of the large claw, the large claw leaves the ratchet wheel.

[0010] As a preference of the present utility model, the angle adjuster further includes a left side plate, a middle plate, and a right side plate, and the ratchet wheel and the large pawl are disposed between the middle plate and the right side plate.

[0011] As a preference of the present utility model, button holes are provided at positions on the upper table board shell and the lower table board shell that are opposite to the button.

[0012] As a preference of the present utility model, the transmission part includes a plurality of transmission shafts, and gears for transmission are provided on the transmission shafts; a large pawl spring for pressing the large pawl is provided on the large pawl, and a button spring is provided on the button.

[0013] As a preference of the present utility model, a guide groove is provided on the left side plate, and the guide groove is used to guide the movement of the lever; the knob is disposed through the middle plate, and both ends of the knob are rotatably connected to the left side plate and the right side plate.

[0014] As a preference of the present utility model, the angle adjuster includes a small pawl and a small pawl spring, the small pawl is disposed opposite to the large pawl and is connected to the knob, and the small pawl is used to lock the knob.

[0015] As a preference of the present utility model, a second plane is formed on the knob, and when the second plane contacts the inner surface of the small pawl, the small pawl locks the knob under the drive of the small pawl spring.

[0016] Compared with the prior art, the advantages and beneficial effects of the present utility model are:

[0017] (1) The present utility model provides a table board angle adjustment mechanism with a brand-new structure, enabling the table board that originally only had two angular positions of opening and closing to hover at multiple angles. Especially when the backrest is adjusted at a large angle in terms of pitch angle, the table board angle can be further adjusted to a state that can meet the user's usage requirements, and the locking and unlocking of the table board can be realized at multiple positions, improving the usage convenience.

[0018] (2) The present utility model uses the forward tilt posture of the seat backrest as the initial position for the design of the table board link mechanism. When combined with the table board angle adjustment mechanism of the present utility model, the table board angle can be leveled within most of the angle range from forward tilt to backward tilt of the backrest, enabling the table board to find a suitable horizontal angle and ensuring the applicability of the table board. Especially in the application of automotive zero-gravity seats and angle-adjustable seats, it belongs to a leading design, providing great convenience for the industry and great comfort for users.

[0019] (3) The present utility model is reasonable in design, compact in structure, and simple in manufacturing process. The modular structure design makes disassembly and maintenance convenient, meeting the trend of more comfort and convenience required by current new energy vehicles. Description of the Drawings

[0020] Other objects and results of the present utility model will become more apparent and easier to understand by referring to the following description in conjunction with the accompanying drawings. In the drawings:

[0021] Figure 1 is a schematic diagram of the table board link mechanism of the present utility model when the backrest frame is in the forward-leaning posture;

[0022] Figure 2 is a schematic diagram of the table board link mechanism of the present utility model when the backrest frame is in the backward-leaning angle;

[0023] Figure 3 is the present utility model Figure 2 partial enlarged view;

[0024] Figure 4 is a perspective view of the angle adjuster of the present utility model;

[0025] Figure 5 is an exploded view of the angle adjuster of the present utility model;

[0026] Figure 6 is an exploded view of the angle adjuster of the present utility model with the housing removed;

[0027] Figure 7 is a perspective view of a partial structure of the angle adjuster of the present utility model;

[0028] Figure 8 is another perspective view of a partial structure of the angle adjuster of the present utility model;

[0029] Figure 9 is yet another perspective view of a partial structure of the angle adjuster of the present utility model;

[0030] Figure 10 is a perspective view of a partial structure of the angle adjuster of the present utility model with the housing removed;

[0031] Figure 11 is another perspective view of a partial structure of the angle adjuster of the present utility model with the housing removed;

[0032] Figure 12 is a perspective view of the knob of the angle adjuster of the present utility model;

[0033] Figure 13 is a schematic diagram of a seat backrest (initial design position) for installing the table board assembly of the present utility model;

[0034] The reference numerals therein include: tabletop skeleton 1, tabletop upper shell 2, tabletop lower shell 3, tabletop link mechanism 4, tabletop angle adjustment mechanism 5, chair back skeleton 6, connecting shaft 7, connecting bracket 41, upper link 42, lower link 43, angle adjuster 50, housing 51, rotating shaft 52, first gear 53, transmission part 54, large claw 55, knob 56, lever 57, button 58, small claw 59, avoidance structure 421, left side plate 510, middle plate 511, right side plate 512, fastener 513, ratchet 541, transmission shaft 542, gear 543, tooth 551, large claw spring 552, positioning pin 553, first plane 561, first arc surface 562, second plane 563, connecting piece 564, button spring 581, small claw spring 591, positioning pin 592, guide groove 5101, retaining piece 5121, retaining piece 5122. Detailed implementation manners

[0035] 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 a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope protected by the present invention.

[0036] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is 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 thus cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0037] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. It should be pointed out that all the drawings are exemplary representations. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0038] The present invention will be further described in detail below through specific implementation examples in combination with the accompanying drawings.

[0039] Such asFigure 1 , Figure 2 As shown, a table-board link mechanism with a forward-tilted posture as the initial design position provided in this embodiment includes a left link mechanism and a right link mechanism. The left link mechanism and the right link mechanism both include a link support 41, an upper link 42, and a lower link 43. The link support 41 is fixedly connected to the backrest frame 6. One end of the upper link 42 is rotatably connected to the link support 41, and the other end is rotatably connected to the table-board assembly. One end of the lower link 43 is rotatably connected to the link support 41, and the other end is rotatably connected to the table-board assembly. The improvement made is that: on the side of the upper link 42 facing the lower link 43, there is a concave avoidance structure 421. When the backrest frame 6 is in a forward-tilted posture, there is a gap between the upper link 42 and the lower link 43. The table-board assembly includes a table-board frame 1 and a table-board angle adjustment mechanism 5. Two side arms of the table-board frame 1 are respectively rotatably connected to the upper links 42 on the left and right sides. The table-board angle adjustment mechanism 5 includes a rotating shaft 52 and an angle adjuster 50 connected to the rotating shaft and fixedly connected to the table-board frame. The angle adjuster 50 can be locked or unlocked with the rotating shaft 52 at multiple angular positions. The rotating shaft 52 is arranged below the upper link 42 and is rotatably connected to the lower links 43 on the left and right sides at both ends. The table-board link mechanism and the table-board angle adjustment mechanism are used in cooperation. When the backrest tilts forward or backward, the table-board link mechanism can meet the support requirements, and at the same time, the table-board plane can be adjusted to an angle that meets the use requirements through the table-board angle adjustment mechanism.

[0040] Furthermore, in this embodiment, the upper link 42 and the lower link 43 are connected to the link support 41 by riveting, and rivet bushings (not shown) are provided in the connection holes of the upper link 42 and the lower link 43. Both ends of the rotating shaft 52 are fixedly connected to two connecting shafts 7. The other end of the connecting shaft 7 is provided with a stepped connecting pin, and the stepped connecting pin is inserted into the end of the connection hole of the lower link 43 and fastened with a nut.

[0041] As Figures 1 to 13As shown in the figure, this embodiment also provides a table board assembly with a forward tilt posture as the initial design position. The table board assembly includes a table board skeleton 1, an upper table board shell 2, a lower table board shell 3, the above-mentioned table board link mechanism 4, and a table board angle adjustment mechanism 5. Among them, the upper table board shell 2 and the lower table board shell 3 are arranged on the upper and lower sides of the table board skeleton 1. The table board link mechanism 4 cooperates with the table board angle adjustment mechanism 5 to support and flip the table board. The table board angle adjustment mechanism 5 is used to adjust the table board at multiple angles. The table board angle adjustment mechanism 5 includes a rotating shaft 52 and an angle adjuster 50 connected to the rotating shaft 52 and fixedly connected to the table board skeleton 1. The two ends of the rotating shaft 52 are connected to the ends of two lower link rods 43 through a connecting shaft 7. The angle adjuster 50 can be locked or unlocked with the rotating shaft 52 at multiple angular positions, so that the table board can hover at multiple angles from forward tilt to backward tilt. Especially when the backrest is adjusted at a large angle of pitch, the table board angle can be continuously adjusted to reach a state that can meet the user's usage requirements and improve the usage convenience.

[0042] Further, as Figures 4 to 12 shown in the figure, in this embodiment, the angle adjuster 50 includes a housing 51, a first gear 53, a transmission part 54, a large claw 55, a dial 56, a lever 57, and a button 58. The housing 51 is fixedly connected to the table board skeleton 1. The rotating shaft 52 passes through the housing 51. The first gear 53 is arranged on the rotating shaft 52. The transmission part 54 is connected to the first gear 53. The transmission part 54 includes a ratchet wheel 541. The transmission part 54 can synchronously transmit the rotation of the rotating shaft 52 to the ratchet wheel 541. The large claw 55 is connected to the transmission part 54. The large claw 55 is rotatable and used to limit the movement of the transmission part 54. The large claw 55 is provided with teeth 551 meshing with the ratchet wheel 541. The locking and unlocking of the rotating shaft 52 can be realized through the meshing relationship between the large claw 55 and the ratchet wheel 541. The dial 56 is connected to the large claw 55. The dial 56 can control the meshing or non-meshing of the large claw 55 and the ratchet wheel 541. The lever 57 is connected to the dial 56. The button 58 is connected to the lever 57. Button holes (not marked) are provided on the upper table board shell 2 and the lower table board shell 3 at positions opposite to the button 58. The two ends of the button 58 penetrate through the button holes.

[0043] Further, in another embodiment, the transmission part 54 includes a plurality of transmission shafts 542. Gears 543 for transmission are arranged on the transmission shafts 542. Different transmission shafts 542 rotate with each other through the gears 543. During the rotation of the rotating shaft 52, the rotational speed is gradually transmitted from the first gear 53 and the plurality of gears 543 to the ratchet wheel 541, and finally a transmission ratio of 1:4 is achieved.

[0044] The knob 56 is formed with a first flat surface 561 and a first arc surface 562. When the first flat surface 561 contacts the bottom surface of the large pawl 55, the large pawl 55 engages with the ratchet wheel 541, being in a locked state; when the first arc surface 562 contacts the bottom surface of the large pawl 55, the large pawl 55 disengages from the ratchet wheel 541, being in an unlocked state.

[0045] A large pawl spring 552 for pressing the large pawl 55 is provided on the large pawl 55 to ensure the stability of the locked state. One end of the large pawl spring 552 is clamped on a positioning pin 553 provided on the large pawl 55.

[0046] A key spring 581 is provided on the key 58. Preferably, two key springs 581 are provided, respectively arranged on the key 58 above and below the lever 57 to provide bidirectional elastic force to the key 58, that is, one end of the key spring 581 abuts against the lever 57, and the other end abuts against the inner surface of the housing 51.

[0047] Further, in another embodiment, the angle adjuster 50 further includes a left side plate 510, a middle plate 511, and a right side plate 512. The left side plate 510, the middle plate 511, and the right side plate 512 are all arranged inside the housing 51 for connecting and fixing related parts. The front ends of the left side plate 510, the middle plate 511, and the right side plate 512 are all connected to the rotating shaft 52, that is, one end of the rotating shaft 52 passes through the left side plate 510, the middle plate 511, and the right side plate 512. The other ends of the left side plate 510, the middle plate 511, and the right side plate 512 are all fixed by fasteners 513. The first gear 53 is located between the middle plate 511 and the left side plate 510. The ratchet wheel 541 and the large pawl 55 are located between the middle plate 511 and the right side plate 512. The ratchet wheel 541 is arranged on the transmission shaft 542 at the last stage of the transmission part 54. Both ends of the large pawl 55 are rotatably connected to corresponding holes on the middle plate 511 and the right side plate 512. One end of the large pawl spring 552 is clamped on a positioning pin 553 provided on the large pawl 55, and the other end abuts against a retaining piece 5121 extending from the right side plate 512. The knob 56 passes through the middle plate 511. Both ends of the knob 56 are rotatably connected to the left side plate 510 and the right side plate 512. A connecting piece 564 for connecting the lever 57 is provided on the knob 56. A guide groove 5101 is provided on the left side plate 510. The guide groove 5101 is used to guide the movement of the lever 57. The key 58 is arranged outside the left side plate 510 and penetrates the housing 51. After pressing the key 58, the lever 57 moves up and down along the guide groove 5101, thereby rotating the knob 56 to achieve the unlocking and locking functions.

[0048] Further, in another embodiment, the angle adjuster 50 further includes a small claw 59 and a small claw spring 591. The small claw 59 is disposed opposite to the large claw 55 and connected to the knob 56, that is, the small claw 59 and the large claw 55 are respectively disposed on both sides of the knob 56. The small claw 59 is used to lock the knob 56. Both ends of the small claw 59 are rotatably connected to corresponding holes of the intermediate plate 511 and the right side plate 512. One end of the small claw spring 591 is clamped on a positioning pin 592 provided on the small claw 59, and the other end abuts against a stop piece 5122 extending from the right side plate 512. A second plane 563 is formed on the knob 56. When the second plane 563 contacts the inner surface of the small claw 59, the small claw 59 locks the knob 56 under the drive of the small claw spring 591.

[0049] The following will refer to Figures 1 to 13 to illustrate the working principle of the present invention.

[0050] Locking working principle of the table board:

[0051] The table board skeleton 1, the table board upper shell 2, the table board lower shell 3, the table board link mechanism 4, and the table board angle adjustment mechanism 5 are assembled into a table board assembly. During the flipping process of the table board assembly, the table board skeleton 1 drives the angle adjuster 50 to rotate around the rotating shaft 52. The rotating shaft 52 drives the transmission part 54 to move. When the large claw 55 meshes with the ratchet 541 under the drive of the large claw spring 552, the first plane 561 of the knob 56 contacts the bottom surface of the large claw 55, and the rotating shaft 52 is in a locked state. The table board skeleton 1 and the rotating shaft 52 are in a fixed state, thereby realizing the hovering of the table board assembly.

[0052] Unlocking working principle of the table board:

[0053] During the flipping process of the table board assembly, a button 58 is exposed on the table board upper shell 2 or the table board lower shell 3. After pressing the button 58, the button 58 drives the knob 56 to rotate. The first arc surface 562 of the knob 56 flips to lift the large claw 55, and the large claw 55 leaves the ratchet 541. At this time, the ratchet 541 is unlocked, and the table board assembly can be adjusted up or down at will. At the same time, after the second plane 563 rotates and abuts against the inner surface of the small claw 59, the small claw 59 and the second plane 563 are stationary under the drive of the small claw spring 591, and the knob 56 is in a locked state to prevent the knob 56 from automatically rotating back. Pressing the button 58 again can lock the rotating shaft 52 to realize the hovering of the table board assembly.

[0054] The above are only the specific implementation manners of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model can easily think of changes or substitutions, which should all be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.

Claims

1. A table plate linkage mechanism with a forward-leaning posture as the initial design position, comprising a left linkage mechanism and a right linkage mechanism. The left linkage mechanism and the right linkage mechanism both include a linkage bracket, an upper linkage, and a lower linkage. The linkage bracket is fixedly connected to the chair back frame. One end of the upper linkage is rotatably connected to the linkage bracket, and the other end is rotatably connected to the table plate assembly. One end of the lower linkage is rotatably connected to the linkage bracket, and the other end is rotatably connected to the table plate assembly. It is characterized in that: The side of the upper connecting rod facing the lower connecting rod is provided with a concave avoidance structure; the table board assembly includes a table board skeleton and a table board angle adjustment mechanism; two side arms of the table board skeleton are respectively rotatably connected to the upper connecting rods on the left and right sides; the table board angle adjustment mechanism includes a rotating shaft and an angle adjuster connected to the rotating shaft and fixedly connected to the table board skeleton; the angle adjuster can be locked or unlocked with the rotating shaft at multiple angular positions, the rotating shaft is arranged below the upper connecting rod, and both ends are respectively rotatably connected to the lower connecting rods on the left and right sides; the table board connecting rod mechanism and the table board angle adjustment mechanism are used in cooperation. When the backrest tilts forward or backward, the table board connecting rod mechanism can meet the support requirements, and at the same time, the table board plane can be adjusted to an angle that meets the use requirements through the table board angle adjustment mechanism.

2. The tabletop link mechanism using the forward-leaning posture as the initial design position according to claim 1, wherein: The upper connecting rod and the lower connecting rod are connected to the connecting rod bracket by riveting, and rivet bushings are arranged in the connecting holes of the upper connecting rod and the lower connecting rod; both ends of the rotating shaft are fixedly connected to two connecting shafts respectively, a stepped connecting pin is arranged at the other end of the connecting shaft, and the stepped connecting pin is inserted into the end of the connecting hole of the lower connecting rod and fastened by a nut.

3. A tabletop assembly with a forward-leaning posture as the initial design position, characterized in that: The table board assembly includes a table board skeleton, a table board upper shell, a table board lower shell, the table board connecting rod mechanism according to claim 1 or 2, and a table board angle adjustment mechanism; wherein, the table board upper shell and the table board lower shell are arranged on the upper and lower sides of the table board skeleton; the table board connecting rod mechanism and the table board angle adjustment mechanism cooperate to support and flip the table board; the table board angle adjustment mechanism is used for adjusting the table board at multiple angles.

4. A tabletop assembly using a forward-leaning posture as the initial design position according to claim 3, characterized in that: The angle adjuster on the table board angle adjustment mechanism includes a housing, a first gear arranged on the rotating shaft, a transmission part connected to the first gear, a large claw for restricting the movement of the transmission part connected to the transmission part, a dial button connected to the large claw, a dial rod connected to the dial button, and a key connected to the dial rod; the transmission part includes a ratchet wheel, teeth meshing with the ratchet wheel are arranged on the large claw, a first plane and a first arc surface are formed on the dial button, when the first plane contacts the bottom surface of the large claw, the large claw meshes with the ratchet wheel, and when the first arc surface contacts the bottom surface of the large claw, the large claw leaves the ratchet wheel.

5. The tabletop assembly using the forward-leaning posture as the initial design position according to claim 4, wherein: The angle adjuster further includes a left side plate, a middle plate, and a right side plate, and the first gear is located between the middle plate and the left side plate; the ratchet wheel and the large claw are arranged between the middle plate and the right side plate.

6. A tabletop assembly using a forward-leaning posture as the initial design position according to claim 4, characterized in that: The angle adjuster includes a small claw and a small claw spring, the small claw is arranged opposite to the large claw and connected to the dial button, and the small claw is used for locking the dial button.

7. A tabletop assembly using a forward-leaning posture as the initial design position according to claim 4, characterized in that: Button holes are arranged on the table board upper shell and the table board lower shell at positions opposite to the key.

8. A tabletop assembly using a forward-leaning posture as the initial design position according to claim 4 or 5 or 6 or 7, characterized in that: The transmission part includes a plurality of transmission shafts, and gears for transmission are arranged on the transmission shafts; a large claw spring for pressing the large claw is arranged on the large claw, and a key spring is arranged on the key.

9. A tabletop assembly using a forward-leaning posture as the initial design position according to claim 5, characterized in that: A guide groove is arranged on the left side plate, and the guide groove is used for guiding the movement of the dial rod; the dial button passes through the middle plate, and both ends of the dial button are rotatably connected to the left side plate and the right side plate.

10. A tabletop assembly using the forward-leaning posture as the initial design position according to claim 6, characterized in that: A second plane is formed on the dial button, and when the second plane contacts the inner surface of the small claw, the small claw locks the dial button under the drive of the small claw spring.

Images