Lifting table board and handrail box

Abstract

The application discloses a lifting table board and a handrail box, which comprise an outer frame body, an inner frame body, a table board assembly, a primary driving mechanism and a secondary driving mechanism.The inner frame body is arranged in the outer frame body and is connected with the outer frame body through sliding fit, so that the inner frame body can move up and down in the outer frame body along the vertical direction.The table board assembly is arranged in the inner frame body and is connected with the inner frame body through sliding fit, so that the table board assembly can move up and down in the inner frame body along the vertical direction.The primary driving mechanism is used for driving the inner frame body to move up and down in the outer frame body.The secondary driving mechanism is used for driving the table board assembly to move up and down in the inner frame body.The inner frame body drives the secondary driving mechanism to act in the lifting process, so that the secondary driving mechanism drives the table board assembly to move up and down.The two-stage driving mode is adopted to realize the lifting of the small table board, and the two-stage driving can be linked with each other, so that the small table board can be conveniently stretched out of the handrail box when needed, so as to meet different demands of users in the vehicle, such as reading and office work.

Description

Technical Field

[0001] This invention belongs to the field of automotive parts technology, specifically relating to a liftable table and armrest box. Background Technology

[0002] Cars are no longer just a means of transportation; they are gradually developing towards greater intelligence and technology, being given more usage scenarios and functions to provide a more comfortable environment and a more complete riding experience.

[0003] A car armrest is a component installed between two seats for storing items. The elbow rest on top of the armrest provides support for the driver's arm, and storage space is located below the elbow rest. With the increasing demand for diverse automotive functions, car armrests are also evolving towards multi-functionality, such as meeting users' needs for reading or working. Summary of the Invention

[0004] The purpose of this invention is to provide a liftable table and armrest box to expand the function of the armrest box and meet the diverse needs of users for automobiles.

[0005] This invention is achieved through the following technical solution:

[0006] The height-adjustable table includes:

[0007] Outer frame;

[0008] An inner frame is disposed within an outer frame and is slidably connected to the outer frame, allowing the inner frame to move vertically up and down within the outer frame.

[0009] A tabletop assembly is disposed within an inner frame and slidably connected to the inner frame, allowing the tabletop assembly to move vertically up and down within the inner frame. The tabletop assembly includes a tabletop support and two small tabletops disposed on the tabletop support. The small tabletops are respectively hinged to the tabletop support, allowing the small tabletops to be relatively unfolded and kept in a horizontal state and relatively folded into a vertical state.

[0010] A primary drive mechanism is used to drive the inner frame to move up and down within the outer frame.

[0011] A secondary drive mechanism is used to drive the tabletop assembly to move up and down within the inner frame.

[0012] During the lifting and lowering process, the inner frame can drive the secondary drive mechanism to move, thereby driving the table panel assembly to lift and lower.

[0013] In some embodiments, the secondary drive mechanism includes a first transmission rack disposed on the outer frame, a transmission gear disposed on the inner frame, and a second transmission rack disposed on the tabletop support. The transmission gear is rotatably connected to the inner frame, and the transmission gear is meshed with the second transmission rack. During the lifting and lowering process, when the transmission gear moves to the position of the first transmission rack, it can mesh with the first transmission rack.

[0014] In some embodiments, a support member is provided between the small table and the inner frame, with one end of the support member hinged to the small table and the other end hinged to the inner frame.

[0015] In some embodiments, a limiting member is provided on the outer frame. When the inner frame is housed in the outer frame, the end of the support member abuts against the limiting member to restrict the rotation of the support member on the inner frame.

[0016] In some embodiments, the primary drive mechanism includes a motor, a winding wheel disposed on the motor shaft, and a pull wire connected to the winding wheel, the pull wire being connected to the inner frame.

[0017] In some embodiments, the motor is mounted on an outer frame, the outer frame is provided with a guide wheel assembly, the inner frame is provided with a traction wheel, and the pull cable is mounted on the guide wheel assembly and connected to the traction wheel.

[0018] In some embodiments, a pull wire bracket is provided on the outer frame, and the pull wire bracket is provided with two limiting parts for limiting the wire sleeves fitted on the pull wire. An adjusting member is provided between the pull wire bracket and the outer frame, and the adjusting member is used to drive the pull wire bracket to move horizontally along the lateral direction of the outer frame.

[0019] In some embodiments, an unfolding limiting structure and / or a retracting limiting structure are provided between the small table and the table support, wherein the unfolding limiting structure and the retracting limiting structure are respectively used to limit the relative movement between the small table and the table support in the unfolded or retracted state.

[0020] In some embodiments, multiple sets of first slide rail assemblies are provided between the inner frame and the outer frame, and the inner frame is slidably connected to the outer frame through the first slide rail assemblies.

[0021] In some embodiments, multiple sets of second slide rail assemblies are provided between the tabletop support and the inner frame, and the tabletop support is slidably connected to the inner frame through the second slide rail assemblies.

[0022] On the other hand, the present invention provides an armrest box, including the aforementioned liftable table.

[0023] In some embodiments, the armrest box includes a box body and an openable elbow rest disposed on the box body, and the lifting table is disposed inside the box body;

[0024] The elbow rest includes two elbow rest assemblies arranged opposite each other along the lateral direction of the box. The elbow rest assemblies are slidably connected to the box, so that the elbow rest assemblies can slide horizontally along the lateral direction of the box.

[0025] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0026] 1) The lifting table of this invention adopts a two-stage drive method to realize the lifting of the small table, reducing the size of the lifting table and facilitating its installation in the armrest box; and the two-stage drive can form a mutual linkage, so that only one power source is needed to realize the two-stage lifting of the small table, simplifying the structure of the lifting table and improving its reliability; when not in use, the small table can be easily stored in the armrest box, and when needed, the small table can be easily extended out of the armrest box, which can meet the different needs of users for reading, working and other purposes in the vehicle.

[0027] 2) The lifting table of the present invention can realize the unfolding and retraction of the small table while driving the small table to move up and down, making the operation of the lifting table more convenient and intelligent.

[0028] 3) The armrest box of the present invention adopts a method of opening and closing the elbow rest from both sides horizontally. When the elbow rest is open, it will not interfere with the unfolding of the small table in the lifting table, making the armrest box more practical. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the small tabletop in its stowed state in one embodiment of the lifting tabletop of the present invention.

[0031] Figure 2 This is a front view of the structure of the small table in the storage state in one embodiment of the lifting table of the present invention.

[0032] Figure 3 for Figure 2 Schematic diagram of the AA-direction section.

[0033] Figure 4 for Figure 2 Schematic diagram of the BB-direction section.

[0034] Figure 5 for Figure 3 A partial schematic diagram at point C.

[0035] Figure 6 for Figure 4 A partial schematic diagram of point D in the middle.

[0036] Figure 7 This is a schematic diagram of the structural principle of the two-stage drive mechanism in the lifting table of the present invention.

[0037] Figure 8 This is a schematic diagram of the structure of the small table in the lifting table of the present invention on the inner frame.

[0038] Figure 9 This is a schematic diagram of the table panel assembly structure in the lifting table panel of the present invention.

[0039] Figure 10 This is a schematic diagram of the arrangement structure of the inner frame and table assembly within the outer frame of the lifting table of the present invention.

[0040] Figure 11 for Figure 10 Partial schematic diagram at point E in the middle.

[0041] Figure 12 This is a schematic diagram of the pull-wire bracket structure in the lifting table of the present invention.

[0042] Figure 13 This is an exploded view of the lifting table panel of the present invention.

[0043] Figure 14 This is a schematic diagram of the unfolded state of the small table in one embodiment of the lifting table of the present invention.

[0044] Figure 15 This is a schematic diagram of the elbow rest in the armrest box of the present invention in the closed state.

[0045] Figure 16 This is a schematic diagram of the elbow rest in the armrest box of the present invention in the open state.

[0046] in:

[0047] 10. Adjustable table;

[0048] 101. Outer frame; 102. Inner frame; 103. Small table; 104. Table support; 105. First transmission rack; 1051. First tooth; 106. Transmission gear; 1061. Transmission tooth; 107. Second transmission rack; 108. Expanding limit block; 109. Closing limit component; 110. Motor; 111. Winding wheel; 112. Pull wire; 113. Guide wheel; 114. Traction wheel; 115. Pull wire bracket; 1151. Slide groove; 1152. Limiting part; 116. Adjusting component; 117. Anti-detachment bracket; 118. Motor bracket; 119. First slide rail assembly; 120. Second slide rail assembly; 121. Support component; 122. Limiting component; 123. Covering component; 124. Buffer component;

[0049] 20. Elbow pillow assembly;

[0050] 30. Box body. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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 some embodiments of the present invention, but not all embodiments.

[0052] Reference Figures 1 to 14 The lifting table 10 of this invention includes:

[0053] The outer frame 101 is a hollow structure with an opening at the top. The outer frame can be a split structure consisting of two parts.

[0054] The inner frame 102 is disposed inside the outer frame 101 and is slidably connected to the outer frame, so that the inner frame can move up and down in the vertical direction within the outer frame; the inner frame 102 is a hollow structure with an opening at the top; the inner frame can be a split structure consisting of two parts.

[0055] The tabletop assembly is housed within the inner frame and slidably connected to it, allowing it to move vertically up and down within the inner frame. (Refer to...) Figure 3 The tabletop assembly includes a tabletop support 104 and two small tabletops 103 mounted on the tabletop support. The two small tabletops 103 are hinged to the tabletop support 104, allowing the small tabletops to be relatively unfolded and kept in a horizontal state when unfolded, and relatively folded into a vertical state. The small tabletops can be unfolded manually, and the small tabletops can be kept in a horizontal state when unfolded by setting a corresponding limiting structure on the tabletop support to support the small tabletops when unfolded, or by using other existing structures.

[0056] A primary drive mechanism is used to drive the inner frame 102 to move up and down within the outer frame 101.

[0057] The secondary drive mechanism is used to drive the table assembly to move up and down within the inner frame 102.

[0058] During the lifting and lowering process, the inner frame 102 can drive the secondary drive mechanism to move, thereby driving the table assembly to lift and lower. Taking the upward movement of the inner frame within the outer frame as an example, under the action of the primary drive mechanism, the inner frame rises. During this upward movement, the inner frame drives the secondary drive mechanism, which in turn drives the table assembly to move upward. At this time, the table assembly moves upward along with the inner frame while simultaneously moving upward under the action of the secondary drive mechanism, thus achieving two-stage transmission for the table assembly. In this way, a single power source can achieve two-stage drive for the table assembly, facilitating the installation of the lifting table within the armrest box and the convenient storage of the table assembly within the outer frame.

[0059] In one embodiment, reference is made to Figure 3 , 8 9. The secondary drive mechanism includes a first transmission rack 105 disposed on the outer frame 101, a transmission gear 106 disposed on the inner frame, and a second transmission rack 107 disposed on the table support 104. The transmission gear 106 is rotatably connected to the inner frame 102, and the transmission gear 106 is meshed with the second transmission rack 107. During the lifting and lowering movement of the inner frame, when the transmission gear moves to the position of the first transmission rack, it can mesh with the first transmission rack.

[0060] Specifically, in the secondary drive mechanism, the first transmission rack 105 is fixedly installed inside the outer frame 101 and near the opening of the outer frame. When the primary drive mechanism drives the inner frame 102 to move upward, such as after the inner frame moves upward by 110mm (taking the total stroke of the inner frame rising as 190mm as an example), the transmission gear on the inner frame meshes with the first transmission rack. When the inner frame continues to move upward, the transmission gear starts to rotate under the action of the first transmission rack. When the transmission gear rotates, it drives the second transmission rack to move upward, thereby driving the table support connected to the second transmission rack to move. At this time, the small table can be driven to move until the small table is completely extended out of the inner frame, so that the small table can be unfolded to a horizontal state, realizing the secondary transmission drive during the upward process of the small table.

[0061] Similarly, when the primary drive mechanism drives the inner frame to move downward, the transmission gear rotates in the opposite direction under the action of the first transmission rack. When the transmission gear rotates, it drives the second transmission rack to move downward. The second transmission rack drives the table support and the small table to move downward. At this time, the table assembly moves downward within the inner frame as the inner frame descends, realizing the secondary transmission drive during the descent of the small table. When the inner frame moves to the point where the transmission gear and the first transmission rack separate, the small table is completely retracted into the inner frame. This way, when the inner frame continues to move downward, it will not affect the small table, until the inner frame is completely retracted into the outer frame, so that the table assembly can be stored in the outer frame.

[0062] Reference Figure 7 This diagram illustrates the engagement structure between the first and second transmission racks and the transmission gear. To prevent jamming or tooth collision damage between the transmission gear 106 and the first transmission rack 105 when the transmission gear engages with the first transmission rack, the height of the first tooth 1051 on the side of the first transmission rack 105 closest to the transmission gear is set to be less than the height of the other teeth on the first transmission rack 105, typically half the height of the other teeth. Furthermore, the height of the first transmission tooth 1061 on the transmission gear 106 that contacts the first transmission rack is also set to be less than the height of the other teeth on the transmission gear 106, typically half the height of the other teeth on the transmission gear. By adopting this structure, the transmission gear and the first transmission rack can be smoothly engaged during repeated engagement and disengagement, ensuring the stability of the lifting table's lifting action during use.

[0063] In one embodiment, reference is made to Figure 3 , Figure 8 Support members 121 are respectively provided between the small tabletop 103 and the inner frame 102. One end of the support member 121 is hinged to the small tabletop 103, and the other end is hinged to a hinge seat provided at one end of the opening of the inner frame 102. When the tabletop support moves upward under the action of the secondary drive mechanism, the two small tabletops can automatically unfold to the sides to a horizontal state under the action of the two support members. At this time, the support members can also provide stable support for the small tabletops. Similarly, when the tabletop support moves downward under the action of the secondary drive mechanism, the two small tabletops can automatically fold towards the center to a vertical state under the action of the two support members. Here, the support member 121 is set as a bent structure. In the folded state, a part of the support member can fit closely with the small tabletop, which facilitates the storage of the entire tabletop assembly within the outer frame.

[0064] In one embodiment, reference is made to Figure 3 and Figure 5 Two limiting members 122 are provided on the outer frame 101. The function of the limiting members 122 is to allow the ends of the two supporting members 121 to abut against the limiting members 122 when the small table is rotated to the folded state and the inner frame is stored in the outer frame. At this time, the limiting members can restrict the rotation of the supporting members on the inner frame, ensuring the stability of the small table when it is folded and the inner frame is stored in the outer frame, and preventing the small table from making abnormal noises during the movement of the car.

[0065] An unfolding limiting structure is provided between the tabletop support 104 and the small tabletop 103. This unfolding limiting structure is used to restrict the rotation of the small tabletop when it is unfolded, thereby preventing the small tabletop from shaking or making abnormal noises when unfolded, thus improving product quality. (Refer to...) Figure 6 The unfolding limiting mechanism here consists of unfolding limiting blocks 108 respectively installed on the two small tables. When the two small tables are unfolded to a horizontal state, the unfolding limiting blocks 108 are located precisely between the small tables and the table support, thus providing auxiliary limiting for the small tables. The unfolding limiting blocks 108 can be made of a rubber material with a certain degree of elasticity, which plays a certain role in cushioning and shock absorption.

[0066] A retractable limiting structure is provided between the tabletop support 104 and the small tabletop 103. This retractable limiting structure is used to limit the rotation of the small tabletop when it is retracted, thereby preventing the small tabletop from shaking or making abnormal noises when retracted, thus improving product quality. (Refer to...) Figure 6 The folding limiting structure here is a folding limiting member 109 located at the end of the tabletop support. The folding limiting member 109 has limiting slots. When the two small tabletops rotate to the folded state, the hinged ends of the two small tabletops rotate into the limiting slots respectively. At this time, the ends of the two small tabletops, which are side-by-side, are precisely locked into the limiting slots, thus limiting the two small tabletops in the folded state. The folding limiting member 109 can be made of a rubber material with a certain degree of elasticity, providing a certain degree of cushioning and shock absorption.

[0067] In one embodiment, reference is made to Figure 10 , Figure 11 and Figure 12The primary drive mechanism includes a motor 110, a winding wheel 111 mounted on the motor shaft, and a pull wire 112 connected to the winding wheel, which is connected to the inner frame 102. During operation, the motor drives the winding wheel to rotate, winding the pull wire around it and shortening it. This causes the pull wire to drag the inner frame within the outer frame, pulling the inner frame out of the outer frame and achieving the upward movement of the inner frame. Similarly, when the motor drives the winding wheel to rotate in the opposite direction, the pull wire wound on the winding wheel is unwound, causing the inner frame to move downward under gravity, achieving the downward movement of the inner frame. Of course, other existing drive methods or structures can also be used to achieve the lifting and lowering of the inner frame, such as an electric push rod.

[0068] In this embodiment, the motor 110 is located outside the outer frame 101. Multiple guide wheel assemblies and a cable pull bracket are fixedly installed inside the outer frame. Each guide wheel assembly includes two guide wheels 113. A traction wheel 114 is installed on the inner frame 102. Two cables are respectively attached to the two guide wheels 113. The two guide wheels 113 respectively support, guide, and change the direction of the two cables. Then, the cable 112 is looped onto the traction wheel 114. Generally, the traction wheel 114 is located at the lower end of the inner frame 102, so that the inner frame can be pulled out of the outer frame by the action of the cables in the primary drive mechanism, thus driving the inner frame.

[0069] Here, a pull wire bracket 115 is provided on the outer frame. The pull wire bracket 115 has sliding grooves 1151 at both ends. The sliding grooves form a sliding fit connection with the outer frame, allowing the pull wire bracket to slide horizontally along the lateral direction of the outer frame. The pull wire bracket 115 is provided with two limiting parts 1152 for limiting the wire sleeves (not shown in the figure) on the pull wire. One end of the wire sleeve is fixed on one side of the winding wheel, and the other end of the wire sleeves of the two pull wires are respectively locked onto the limiting parts 1152. An adjusting member 116 is provided between the pull wire bracket 115 and the outer frame 101. The adjusting member 116 is used to drive the pull wire bracket to move along the lateral direction of the outer frame, while fixing the pull wire bracket 115. Specifically, the adjusting component 116 can be an adjusting screw. The adjusting screw is movably connected to the outer frame, allowing it to rotate along its axis on the outer frame. One end of the adjusting screw is movably connected to the outer frame, and the outer frame limits its horizontal movement on the outer frame, ensuring that the adjusting screw can only rotate along its axis on the outer frame. Simultaneously, the adjusting screw is threadedly connected to the pull wire bracket. By rotating the adjusting screw, the position of the pull wire bracket can be adjusted. When the pull wire bracket moves laterally, it can tighten or loosen the cable sleeve, changing the tension between the cable sleeve and the pull wire, thereby adjusting the tension of the pull wire. The cable sleeve on the pull wire is a prior art technology.

[0070] In one embodiment, an anti-detachment bracket 117 is provided at the location of the winding wheel. The anti-detachment bracket 117 is disposed on one side of the winding wheel 111 and is configured to fit with the gap between the winding wheel and the winding wheel. It is used to limit the pull wire on the winding wheel to prevent the pull wire from falling off the winding wheel.

[0071] A motor bracket 118 is provided on the outer frame 101 to fix the motor 110 on the outer frame.

[0072] In one embodiment, multiple sets of first slide rail assemblies 119 are provided between the inner frame 102 and the outer frame 101, and the inner frame 102 is slidably connected to the outer frame 101 through the first slide rail assemblies 119. Specifically, refer to... Figure 13 Four sets of first slide rail assemblies 119 are provided between the inner frame and the outer frame. Each first slide rail assembly includes a slide rail and a slider disposed on the slide rail. The slider and the slide rail are slidably engaged. The slide rails are respectively installed on the outer frame, and the inner frame is connected to the slider, thereby realizing the sliding engagement connection between the inner frame and the outer frame.

[0073] like Figure 13 As shown, the outer frame is designed as a two-part composite structure to facilitate the installation of the inner frame within the outer frame.

[0074] In one embodiment, multiple sets of second slide rail assemblies 120 are provided between the tabletop support 104 and the inner frame 102, and the tabletop support is slidably connected to the inner frame through the second slide rail assemblies. Similarly, the second slide rail assembly includes a slide rail and a slider disposed on the slide rail. The corresponding slide rails are respectively installed on the inner frame, and the tabletop support is connected to the slider to realize the slidable connection between the tabletop support and the inner frame.

[0075] Similarly, as Figure 13 As shown, the inner frame is designed as a two-part composite structure to facilitate the installation of the tabletop assembly within the inner frame.

[0076] In one embodiment, a shielding member 123 is provided on both sides of the inner frame 102 at one end of its opening, so that when the upper end of the inner frame rises to the opening position of the outer frame, the shielding member 123 is exactly located at the opening position of the outer frame, which is used to shield the gap between the inner frame and the outer frame, and ensure that the small table is more aesthetically pleasing when it is extended and unfolded.

[0077] In one embodiment, a buffer 124 is provided at the bottom of the outer frame and the inner frame between the outer frame and the inner frame to provide buffer between the two when the inner frame descends to the bottom of the outer frame, so as to prevent abnormal noise from the lifting table during use.

[0078] On the other hand, the present invention also relates to an armrest box employing the lifting table 10 in the above embodiments.

[0079] In one embodiment, reference is made to Figure 15 and Figure 16 The armrest box includes a box body 30 and an openable elbow rest mounted on the box body 30, and a height-adjustable table 10 is mounted inside the box body.

[0080] When needed, simply open the elbow rest and start the motor to extend and unfold the small table from inside the box.

[0081] In one embodiment, the elbow rest includes two elbow rest assemblies 20 arranged opposite each other along the lateral direction of the housing. The elbow rest assemblies 20 are slidably connected to the housing, allowing them to slide horizontally along the lateral direction of the housing. By opening and closing the elbow rests horizontally from both sides, the elbow rests, when open, do not interfere with the unfolding of the small table in the lifting table. The elbow rest assemblies can be electrically driven, enabling automatic opening of the elbow rest, followed by the extension and unfolding of the small table from the housing; and automatic retraction of the small table back into the housing, closing the elbow rest. This enhances the intelligence and technological feel of the armrest box, improving the user experience and quality.

[0082] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., used to indicate the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product of this invention is usually placed in during use. They are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0083] Furthermore, the use of terms such as "horizontal" and "vertical" in the description of this invention does not imply that the components are required to be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0084] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0085] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A height-adjustable table, characterized in that, include: Outer frame; An inner frame is disposed within an outer frame and is slidably connected to the outer frame, allowing the inner frame to move vertically up and down within the outer frame. A tabletop assembly is disposed within an inner frame and slidably connected to the inner frame, allowing the tabletop assembly to move vertically up and down within the inner frame. The tabletop assembly includes a tabletop support and two small tabletops disposed on the tabletop support. The small tabletops are respectively hinged to the tabletop support, allowing the small tabletops to be relatively unfolded and kept in a horizontal state and relatively folded into a vertical state. A primary drive mechanism is used to drive the inner frame to move up and down within the outer frame. A secondary drive mechanism is used to drive the tabletop assembly to move up and down within the inner frame. The inner frame can drive the secondary drive mechanism to move during the lifting and lowering process, so that the secondary drive mechanism drives the table panel assembly to move up and down. Support members are provided between the small table and the inner frame. One end of the support member is hinged to the small table, and the other end is hinged to the inner frame. The secondary drive mechanism includes a first transmission rack mounted on the outer frame, a transmission gear mounted on the inner frame, and a second transmission rack mounted on the tabletop support. The transmission gear is rotatably connected to the inner frame, and the transmission gear is meshed with the second transmission rack. During the lifting and lowering movement of the inner frame, when the transmission gear moves to the position of the first transmission rack, it can mesh with the first transmission rack. When the transmission gear moves to the position of meshing with the first transmission rack and the inner frame continues to move upward, the transmission gear starts to rotate under the action of the first transmission rack. When the transmission gear rotates, it drives the second transmission rack to move upward, thereby driving the tabletop support connected to the second transmission rack to move until the small tabletop is completely extended out of the inner frame, allowing the small tabletop to unfold to a horizontal state.

2. The lifting tabletop according to claim 1, characterized in that, A limiting member is provided on the outer frame. When the inner frame is housed in the outer frame, the end of the support member abuts against the limiting member to restrict the rotation of the support member on the inner frame.

3. The lifting tabletop according to claim 1, characterized in that, The primary drive mechanism includes a motor, a winding wheel mounted on the motor shaft, and a pull wire connected to the winding wheel, the pull wire being connected to the inner frame.

4. The lifting tabletop according to claim 3, characterized in that, The motor is mounted on the outer frame, which is equipped with a guide wheel assembly. The inner frame is equipped with a traction wheel, and the pull cable is mounted on the guide wheel assembly and connected to the traction wheel.

5. The lifting tabletop according to claim 4, characterized in that, The outer frame is provided with a pull wire bracket, and the pull wire bracket is provided with two limiting parts for limiting the wire sleeves on the pull wire. An adjusting component is provided between the pull wire bracket and the outer frame, and the adjusting component is used to drive the pull wire bracket to move horizontally along the lateral direction of the outer frame.

6. The lifting tabletop according to claim 1, characterized in that, An unfolding limiting structure and / or a retracting limiting structure are provided between the small table and the table support. The unfolding limiting structure and the retracting limiting structure are used to limit the relative movement between the small table and the table support in the unfolded or retracted state, respectively.

7. The lifting tabletop according to claim 1, characterized in that, Multiple sets of first slide rail assemblies are provided between the inner frame and the outer frame, and the inner frame is slidably connected to the outer frame through the first slide rail assemblies.

8. The lifting tabletop according to claim 1, characterized in that, Multiple sets of second slide rail assemblies are provided between the tabletop support and the inner frame, and the tabletop support is slidably connected to the inner frame through the second slide rail assemblies.

9. An armrest box, characterized in that, The lifting table includes any one of claims 1-8.

10. The armrest box according to claim 9, characterized in that, The armrest box includes a box body and an openable elbow rest mounted on the box body, and the lifting table is mounted inside the box body; The elbow rest includes two elbow rest assemblies arranged opposite each other along the lateral direction of the box. The elbow rest assemblies are slidably connected to the box, so that the elbow rest assemblies can slide horizontally along the lateral direction of the box.

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