Backrest table board, seat backrest and automobile seat

Abstract

The application relates to a back table plate, a seat back and an automobile seat, and relates to the technical field of seats. The back table plate comprises a table plate body, a driving assembly and a linkage assembly. The table plate body is movably connected to the back side of the seat back through the linkage assembly, and the driving assembly is installed in the interior of the table plate body and is in transmission connection with the linkage assembly. When the driving assembly is started, power is output, the table plate body is driven to overturn relative to the seat back through the linkage assembly, and the table plate body is switched between a storage state and an unfolded state. When the driving assembly is turned off, the driving assembly can keep the position of the output end stable by means of internal gear self-locking or friction limiting structure, the table plate body is suspended at the current position, and the table plate body will not drop or move reversely due to vehicle vibration or slight external force, so that the use stability and safety are improved, the overall structure is compact, the thickness of the seat back is not additionally increased, and the back table plate has high practical value.

Description

Technical Field

[0001] This application relates to the field of seating technology, and more particularly to a backrest table, a seat back, and a car seat. Background Technology

[0002] Currently, in existing car seats, the built-in electric tray tables often lack sufficient self-locking capability during adjustment, making it difficult to reliably lock in the middle position. This results in poor load-bearing capacity of the tray table during use, making it prone to shaking or positional displacement, affecting the user experience and safety. Utility Model Content

[0003] This application provides a backrest table, a seat back, and a car seat to at least partially solve the above-mentioned technical problems.

[0004] To achieve the above objectives, according to a first aspect of this application, a backrest table is provided, including a table body, a drive assembly, and a linkage assembly. The table body is configured to be movably connected to the rear side of a seat back via the linkage assembly. The drive assembly is installed in the table body and is drively connected to the linkage assembly. The drive assembly is configured to rotate the table body relative to the seat back when activated, and to suspend the table body at its current position when closed.

[0005] Optionally, the drive assembly includes a drive component and a transmission component, wherein a first transmission end of the transmission component is connected to the drive component, and a second transmission end of the transmission component is connected to the linkage assembly.

[0006] Optionally, the driving component includes a drive motor, a lead screw, a sliding part, and a rack. The lead screw is coaxially connected to the output shaft of the drive motor. The sliding part is threaded onto the lead screw and is slidably limited and fitted into the table body along the length direction of the lead screw. The rack is disposed on the sliding part and the length direction of the rack is consistent with the length direction of the lead screw. The rack is connected to the transmission component for transmission.

[0007] Optionally, the tabletop body is provided with a limiting frame, the limiting frame has a limiting groove, and the sliding part is slidably disposed in the limiting groove.

[0008] Optionally, the transmission component includes a first gear, a rotating shaft, a second gear, and a rotating frame. The first gear and the rotating shaft are both rotatably disposed within the table body. The second gear is coaxially connected to the rotating shaft and meshes with the first gear. The rotating frame is fixedly connected to the rotating shaft and is connected to the linkage assembly in a transmission manner.

[0009] Optionally, the linkage assembly includes a first rod and a second rod. The first rod is configured to be hinged at one end to the back side of the seat back and at the other end to the rotating frame. The second rod is configured to be hinged at one end to the back side of the seat back and at the other end to the rotating frame. The first rod, the second rod, the rotating frame, and the seat back form a quadrilateral rotating structure.

[0010] Optionally, the thickness of the tabletop body is in the range of 30mm to 40mm.

[0011] Optionally, the thickness of the tabletop is 35mm.

[0012] According to a second aspect of this application, a seat back is provided, including the backrest table described in the first aspect.

[0013] According to a third aspect of this application, an automobile seat is also provided, including the seat back described in the second aspect.

[0014] In the backrest table of this application embodiment, by setting a driving component inside the table body and connecting the driving component with the linkage component, the table body can switch between a folded state and an unfolded state relative to the seat back. In this process, it not only has the function of automatic flipping, but also when the driving component is closed, the table body can remain suspended in the current position by relying on the gear self-locking or friction limiting action of the driving component, so as to have high stability at different angle positions.

[0015] This structural design allows the tabletop to provide a certain degree of load-bearing assistance when unfolded. The torque damping effect of the drive component enhances load-bearing capacity, reduces swaying and positional shift when users place items on it, and significantly improves comfort and safety during use. At the same time, because the drive component is located inside the tabletop, it does not significantly increase the thickness of the seat back, thus maintaining the compactness and rationality of the overall structure within limited space.

[0016] The above design not only meets users' needs for convenient electric flipping and electric control operation, but also provides stable support when the table is in different states, thus taking into account structural compactness, ease of use and functional reliability, and has obvious comprehensive benefits in practical applications. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0019] Figure 1 This is a partial schematic diagram of the backrest table in the embodiment of this application, which is in a stowed state on the back of the seat.

[0020] Figure 2 This is a partial schematic diagram of the backrest table in the embodiment of this application, with the table extended on the back of the seat.

[0021] Figure 3 This is a partial schematic diagram illustrating the positional relationship between the tabletop and the linkage components in an embodiment of this application;

[0022] Figure 4 This is an internal structural diagram of the tabletop in the unfolded state, as shown in the embodiments of this application.

[0023] Figure 5 This is an internal structural diagram of the display table body in its stowed state, as shown in the embodiments of this application.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Tabletop body; 11. Limiting frame; 111. Limiting groove; 2. Drive assembly; 21. Drive component; 211. Drive motor; 212. Lead screw; 213. Sliding part; 214. Rack; 22. Transmission component; 221. First gear; 222. Rotating shaft; 223. Second gear; 224. Rotating frame; 3. Linkage assembly; 31. First rod; 32. Second rod. Detailed Implementation

[0026] The technical solutions of the embodiments of this application 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 this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0027] Firstly, this application provides a backrest table, please refer to... Figures 1 to 5 The backrest table includes a table body 1, a drive assembly 2, and a linkage assembly 3. The table body 1 is movably mounted on the back side of the seat back via the linkage assembly 3. The linkage assembly 3 can adopt a hinge structure or a connector with a rotating shaft, so that the table body 1 can rotate relative to the seat back around the rotating shaft 222, thereby switching between the folded state and the unfolded state.

[0028] For example, the drive component 2 is installed in the internal space of the table body 1 and is connected to the linkage component 3 for transmission. The drive component 2 can be a combination structure of a motor, a reduction gear set and an output shaft. After the motor is powered on, the motor drives the output shaft to rotate through the reduction gear set. The output shaft drives the linkage component 3, thereby causing the table body 1 to flip along a preset path.

[0029] It is understandable that when the drive component 2 is in working condition, the table body 1 can smoothly rotate from the backrest storage position to the horizontal unfolded position under the drive action, and can also rotate from the unfolded position to the storage position under the drive in the opposite direction. Users can realize the unfolding and folding of the table body 1 through a simple electronic control method.

[0030] At the same time, the drive assembly 2 does not completely lose its force on the table body 1 when it is turned off. On the contrary, after the power is cut off, the drive assembly 2 can keep the output shaft suspended in the current position by relying on the self-locking characteristics of its internal gear set or the configured friction limiting mechanism, so that the table body 1 can be stopped at any angle without falling or rotating in the opposite direction. This suspension effect is technically equivalent to a self-locking function, which prevents the table body 1 from shifting position when the vehicle vibrates or when the user touches it slightly.

[0031] Furthermore, the transmission connection structure of the drive component 2 can provide auxiliary load-bearing function when the table body 1 is in the unfolded state. The torque damping effect formed by the motor and the reduction gear set prevents the table body 1 from shaking significantly when subjected to force. This mechanical stability significantly improves the load-bearing performance of the table body 1.

[0032] Since the drive assembly 2 is located inside the table body 1, it does not increase the thickness of the seat back, thus maintaining structural compactness while achieving good functionality.

[0033] It should be noted that in this embodiment, "hovering" means that when the drive component 2 no longer actively outputs power, the table body 1 can maintain a relatively stable stationary state at the current position by relying on the self-locking of the gears or friction holding effect of the drive component 2. This state is not absolutely fixed, but has a certain resistance to disturbance.

[0034] Through this combination of structure and function, the tabletop 1 has enhanced load-bearing capacity during unfolding and use, making it less prone to swaying and positional shifting. This results in significant benefits in terms of user experience and safety, while maintaining good structural rationality and compactness even with limited space in the seat back. Overall, this embodiment, through the synergistic action of the drive component 2 and the linkage component 3, provides reliable hovering and locking characteristics while fulfilling the flipping function, ensuring that the tabletop 1 remains stable in different positions and meeting the user's comprehensive needs for comfort and safety.

[0035] In some embodiments, such as Figure 3 , Figure 4 As shown, the drive assembly 2 includes a drive component 21 and a transmission component 22. During operation, the drive component 21 can drive the transmission component 22 to rotate or move. The transmission component 22 then transmits the power to the linkage assembly 3, so that the table body 1 can smoothly switch between the folded state and the unfolded state.

[0036] For example, combined Figure 2 , Figure 4 and Figure 5 The driving component 21 includes a drive motor 211, a lead screw 212, a sliding part 213, and a rack 214. The output shaft of the drive motor 211 is coaxially and fixedly connected to the lead screw 212. When the motor is running, the lead screw 212 is driven to rotate synchronously. The sliding part 213 is installed on the lead screw 212 by a threaded connection, and simultaneously slides and is limited within the tabletop body 1 along the length direction of the lead screw 212. Specifically, the sliding part 213 is guided inside the tabletop body 1 by a limiting frame 11. A limiting groove 111 is formed on the limiting frame 11, and the sliding part 213 is slidably placed in the limiting groove 111, so that it can maintain a limited linear movement along the length direction of the lead screw 212 during movement, without deviating in the lateral or other directions. Therefore, when the lead screw 212 rotates, the sliding part 213 does not rotate with the lead screw 212, but moves linearly along the length direction of the lead screw 212 under the action of the thread.

[0037] It is understandable that this limiting structure provides a certain degree of stability in terms of spatial constraint and motion guidance, making the motion path of the sliding part 213 more controllable when driven by the lead screw 212, and also contributing to the smoothness of the entire transmission process.

[0038] For example, the rack 214 is disposed on the sliding part 213, and the length direction of the rack 214 is consistent with the length direction of the lead screw 212. When the sliding part 213 moves along the lead screw 212, the rack 214 will also move synchronously.

[0039] For example, combined Figure 2 , Figure 4 and Figure 5 The transmission component 22 includes a first gear 221, a rotating shaft 222, a second gear 223, and a rotating frame 224. The first gear 221 and the rotating shaft 222 are rotatably mounted inside the table body 1. The second gear 223 is coaxially connected to the rotating shaft 222 and meshes with the first gear 221. The rotating frame 224 is fixedly connected to the rotating shaft 222 and is connected to the linkage component 3 for transmission.

[0040] It can be understood that the rack 214 meshes with the first gear 221 in the transmission component 22. The linear movement of the rack 214 can drive the first gear 221 to rotate, thereby enabling the transmission component 22 to complete the energy conversion from linear motion to rotational motion. The first gear 221 and the rotating shaft 222 are arranged in the same space and form a meshing relationship. When the first gear 221 is subjected to force and rotates, it can drive the second gear 223 to rotate. The second gear 223 is coaxially and fixedly connected to the rotating shaft 222. Therefore, when the second gear 223 rotates, the rotating shaft 222 rotates synchronously. The rotating frame 224 is fixedly connected to the rotating shaft 222. As the rotating shaft 222 rotates, the rotating frame 224 also undergoes angular displacement. The linkage component 3 is connected to the rotating frame 224 via a transmission. The structure of the linkage component 3 can adopt a cooperative arrangement of the first rod 31 and the second rod 32, forming a hinge structure through the rotational connection between the rods. This allows the linkage component 3 to adjust its angle and position under the drive of the rotating frame 224, thereby causing the tabletop 1 to flip relative to the seat back. In this way, after the drive motor 211 is powered on and started, the lead screw 212 rotates, causing the sliding part 213 to move linearly. The sliding part 213 drives the rack 214 to move, and the rack 214 pushes the first gear 221 to rotate. This rotation is then transmitted to the rotating frame 224 via the second gear 223 and the rotating shaft 222. Finally, the linkage component 3 enables the tabletop 1 to switch between being stored and unfolded.

[0041] It is worth noting that in this transmission link, the cooperation between the sliding part 213 and the limiting frame 11 ensures the accuracy of linear motion and prevents the sliding part 213 from shaking during movement. This allows the rack 214 to maintain a stable meshing state when meshing with the first gear 221. This stability is beneficial to improving the smoothness of the transmission process, reducing energy loss and transmission noise.

[0042] Meanwhile, the meshing of rack 214 and first gear 221 is a typical gear meshing transmission structure. This structure has the characteristic of converting linear motion into rotational motion. During meshing, power transmission is achieved through the interaction of tooth profiles, which can provide a certain degree of high transmission efficiency and reliability. The first gear 221 and second gear 223 achieve secondary power transmission through tooth surface meshing. In this process, rotating shaft 222, as a key rotational transmission component, maintains a coaxial fixed relationship with second gear 223, ensuring the continuity and stability of power in the rotational path. Rotating frame 224 is fixedly connected to rotating shaft 222. Its function is to directly convert the rotation of rotating shaft 222 into angular displacement of linkage component 3, so that linkage component 3 produces a corresponding motion effect. Driven by rotating frame 224, linkage component 3 can apply a flipping torque to table body 1, so that table body 1 completes the flipping process from backrest storage state to horizontal unfolded state. The user can switch table body 1 between different states by controlling drive motor 211.

[0043] It should be further explained that, in this embodiment, the "limiting frame 11" refers to a fixed frame structure installed inside the tabletop body 1, used to limit the movement direction of the sliding part 213. The limiting groove 111 on it serves as a guide channel to ensure that the sliding part 213 can only move along the length direction of the lead screw 212. "Hovering" in this scenario means that after the drive assembly 2 is powered off, it relies on the thread self-locking action of the lead screw 212 and the sliding part 213 or the gear meshing friction damping action to keep the tabletop body 1 relatively stable in any position, without free drooping or reverse rotation when power is lost. This state is not absolutely fixed, but has a certain degree of anti-interference capability. With this structural arrangement, when the tabletop body 1 is in the unfolded state, the drive assembly 2 can not only drive it to flip, but also provide support for the tabletop body 1 through the reaction force formed by gear meshing and thread friction, thereby improving the stability of the tabletop body 1 under the action of external forces.

[0044] In summary, this embodiment, through the coordinated operation of the drive component 21 and the transmission component 22, makes the energy transfer process between linear and rotational motion smoother. Under the action of this power chain, the linkage component 3 can reliably switch the tabletop 1 between its stowed and unfolded states. The cooperation between the drive motor 211, lead screw 212, sliding part 213, and rack 214 not only achieves efficient power transmission but also provides guidance and stability during movement, which is beneficial to improving the load-bearing capacity and positional stability of the tabletop 1 when unfolded. The gear set and rotating frame 224 structure in the transmission component 22 ensure continuous power transmission and angular displacement conversion, making the flipping motion of the tabletop 1 highly controllable. At the same time, the overall structure is compact, making it easy to install inside the seat back, and providing a positive effect on the user's operating experience and safety during use.

[0045] In some examples, combined Figure 2 , Figure 4 and Figure 5 The linkage assembly 3 includes a first rod 31 and a second rod 32. One end of the first rod 31 is hinged to the back side of the seat back, and the other end of the first rod 31 is hinged to the rotating frame 224. Similarly, one end of the second rod 32 is hinged to the back side of the seat back, and the other two ends of the first rod 31 are hinged to the rotating frame 224. Furthermore, the hinged portions at both ends of the first rod 31 and the hinged portions at both ends of the second rod 32 are located at different positions on the rotating frame 224 and the seat back, respectively. Thus, the first rod 31, the second rod 32, the rotating frame 224, and the seat back form a quadrilateral rotating structure in terms of geometric configuration.

[0046] It is understandable that when the rotating frame 224 rotates, the quadrilateral structure can undergo geometric deformation through the hinge relationship between the rods, thereby causing the first rod 31 and the second rod 32 to make adaptive adjustments, so that they always maintain a matching relationship with the rotating frame 224. Through this quadrilateral rotating structure, when the rotating frame 224 undergoes angular displacement under the action of the driving component 21 and the transmission component 22, the linkage component 3 can transmit the rotational motion to the table body 1 in a more coordinated manner, making the flipping process of the table body 1 more stable and smooth, without any phenomenon of motion obstruction or excessive angular deviation.

[0047] It should be further clarified that the "quadrilateral rotating structure" referred to here is not a fixed rectangle in the strict sense, but a deformable quadrilateral structure formed by four rotating joints. This structure can change its angle according to the force relationship when the rotating frame 224 moves, thereby providing stable guidance and support for the tabletop 1. Under the action of this structure, the tabletop 1 can always maintain the predetermined movement trajectory during the flipping process from the folded state to the unfolded state. While mechanically transmitting the force, the quadrilateral rotating structure can also distribute the load on the tabletop 1 during the movement, making the overall flipping process smoother, thus improving the smoothness and stability of the tabletop 1.

[0048] Furthermore, when the first rod 31 and the second rod 32 form a hinge point with the seat back, they can provide strong support for the table body 1. This multi-point support method is more effective than single-rod support in distributing the force on the table body 1 during use, thereby enhancing its load-bearing capacity. Overall, this embodiment, through the construction of a quadrilateral rotating structure, makes the linkage component 3 more rational in terms of structural arrangement and motion transmission. It not only ensures the flexibility of the table body 1's flipping but also plays a positive role in load-bearing stability. It provides a beneficial improvement idea for solving the problems of unsmooth flipping, insufficient self-locking, and poor load-bearing capacity in traditional mechanisms.

[0049] In some embodiments, the thickness of the tabletop body 1 ranges from 30mm to 40mm. Specifically, the thickness of the tabletop body 1 is 35mm.

[0050] It is understood that the thickness of the tabletop body 1 is limited to the range of 30mm to 40mm, with 35mm being the preferred thickness. By limiting the thickness parameter, a more reasonable balance can be achieved between structural strength and internal space utilization.

[0051] On the one hand, the table body 1, as the carrier for installing the drive component 2 and the transmission component 22, needs to have sufficient thickness to accommodate components such as the motor, lead screw 212, sliding part 213, and rack 214. If the thickness is too small, it may lead to insufficient internal space, thereby affecting the arrangement of components and transmission efficiency. On the other hand, if the thickness is too large, it will increase the volume and weight of the table body 1 itself, occupy the limited internal space of the seat back, restrict the seat structure design, and may adversely affect the comfort of the seat.

[0052] Therefore, by controlling the thickness between 30mm and 40mm, the tabletop body 1 can maintain a relatively compact overall structure while ensuring the smooth arrangement of internal components.

[0053] By further limiting the thickness to 35mm, a better compromise can be achieved between structural strength, load-bearing capacity, and seat space adaptability. It should be noted that the thickness here refers to the dimension of the table panel 1 in the direction perpendicular to the table panel surface, rather than the thickness of local reinforcing ribs or decorative layers. Its value range is set by comprehensively considering structural mechanics requirements and the overall vehicle layout space, which is beneficial to improving the adaptability and stability of the backrest table in practical applications.

[0054] Secondly, referring to Figures 1 to 5 This application provides a seat backrest, including a backrest table as a first aspect.

[0055] Thirdly, this application provides an automobile seat, including the seat back of the second aspect.

[0056] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0057] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0058] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0059] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A backrest tabletop, characterized in that, The device includes a table body, a drive assembly, and a linkage assembly. The table body is configured to be movably connected to the back side of the seat back via the linkage assembly. The drive assembly is installed in the table body and is drively connected to the linkage assembly. The drive assembly is configured to cause the table body to rotate relative to the seat back when started, and to cause the table body to hover at the current position when closed.

2. A backrest table as described in claim 1, characterized in that, The drive assembly includes a drive component and a transmission component. The first transmission end of the transmission component is connected to the drive component, and the second transmission end of the transmission component is connected to the linkage assembly.

3. A backrest tabletop according to claim 2, characterized in that, The driving component includes a drive motor, a lead screw, a sliding part, and a rack. The lead screw is coaxially connected to the output shaft of the drive motor. The sliding part is threaded onto the lead screw and is slidably limited and fitted into the table body along the length direction of the lead screw. The rack is disposed on the sliding part and the length direction of the rack is consistent with the length direction of the lead screw. The rack is connected to the transmission component for transmission.

4. A backrest tabletop according to claim 3, characterized in that, The tabletop body is provided with a limiting frame, the limiting frame has a limiting groove, and the sliding part is slidably disposed in the limiting groove.

5. A backrest tabletop according to claim 3, characterized in that, The transmission component includes a first gear, a rotating shaft, a second gear, and a rotating frame. The first gear and the rotating shaft are both rotatably mounted in the table body. The second gear is coaxially connected to the rotating shaft and meshes with the first gear. The rotating frame is fixedly connected to the rotating shaft and is connected to the linkage assembly in a transmission manner.

6. A backrest tabletop according to claim 5, characterized in that, The linkage assembly includes a first rod and a second rod. The first rod is configured such that one end is hinged to the back side of the seat back and the other end is hinged to the rotating frame. The second rod is configured such that one end is hinged to the back side of the seat back and the other end is hinged to the rotating frame. The first rod, the second rod, the rotating frame, and the seat back form a quadrilateral rotating structure.

7. A backrest tabletop according to any one of claims 1 to 6, characterized in that, The thickness of the tabletop body ranges from 30mm to 40mm.

8. A backrest table as described in claim 7, characterized in that, The thickness of the tabletop is 35mm.

9. A seat backrest, characterized in that, The backrest table is included in any one of claims 1 to 8.

10. A car seat, characterized in that, Includes the seat back as described in claim 9.

Images