Folding table top device

Abstract

Folding table top arrangement (1) comprising a base support (2), a support arm arrangement (3) connected to the base support (2), and a support arm (6) mounted so as to be rotatable about a first pivot axis (A); and the table plate device (4) is connected with the supporting arm (6) and can rotate around a second overturning shaft (B) relative to the supporting arm (6). The table board device (4) is provided with a fixed arm (7) hinged to the supporting arm (6) and a table board (8), and the table board (8) is installed on the fixed arm (7) in a rotating mode around a rotating shaft (C). Each pivot shaft (A, B) is provided with a drive device (11, 13) and a motor device (12, 14 ') for driving and controlling the rotational movement of the respective pivot shaft (A, B). The table further comprises a motor auxiliary driving device (16) which is used for driving and controlling the table plate (8) to rotate around the rotating shaft (C).

Description

Technical Field

[0001] This utility model relates to a folding desktop device. More particularly, it relates to a folding desktop device for use in vehicles (such as motor vehicles, airplanes, or railway vehicles), installed on a seat in the vehicle, and conveniently used by a person sitting in the seat while the vehicle is in motion. Background Technology

[0002] Especially in the realm of motor vehicles, car customers increasingly demand greater flexibility and adaptability in their vehicle interiors, necessitating vehicles that can meet a wider range of customer requirements. For instance, as driving distances and time spent in vehicles increase, consumers are placing higher demands on vehicle interiors to accommodate activities such as work, play, or dining. In this regard, pre-arranged table systems can be used within the vehicle.

[0003] This type of tabletop device is particularly suitable for rear-seat passengers in motor vehicles, for example, it can be installed in the rear seat console between the left and right seats in a rear seat system. Ideally, this tabletop device should be foldable and stored in a storage compartment, unfolding or flipping to its functional position only when needed. Drivers or passengers may also require the tabletop device. For example, as semi-autonomous or driver-assisted driving becomes increasingly common in vehicles, drivers have fewer driving tasks to perform, allowing them to focus on secondary activities where a table can be helpful. Therefore, there is a growing demand for foldable tabletop devices that can be folded for storage or use as needed. In this regard, in addition to ease of use, simple and perfect operability, sturdiness and durability, and an attractive appearance are also key requirements for such foldable tabletop devices.

[0004] Even in railway vehicles or airplanes, especially in higher transport classes such as first class on railways or business or first class on airplanes, such flexible folding tabletops may be necessary or indispensable for improving comfort.

[0005] DE 10 2015 228 812 A1 describes a folding tabletop structure installed in the console compartment of a rear seat console in a vehicle, equipped with an armrest for rotating to close the console compartment. When the armrest is folded up, the folding table can be pulled out of the console compartment via a rotating arm, and then the tabletop can be unfolded and rotated to the desired position. The position of the folding table can be adjusted according to the position of the occupant sitting on the left or right side of the rear seat console. When not in use, the folding table structure can be retracted again by pushing it into the console compartment via the rotating arm, and then stored inside the console compartment, out of sight from the outside.

[0006] While the familiar folding table structure offers passengers the necessary comfort and functionality, it can be difficult to operate or handle. Passengers wishing to use the tabletop must become familiar with the process of pulling the tabletop out of the console compartment and folding it into use, as well as the reverse process of folding it back into the compartment. This is to avoid misoperation and potential damage to the folding table's components, and to reduce the risk of injury while operating the folding table. Furthermore, rear-seat passengers must align themselves with the rear console, unfold the armrest, grasp the folding table, apply sufficient force to pull it out of the console compartment, then unfold and rotate it to the desired position or fold it back up for storage – a potentially cumbersome process. While a coil spring can be configured to provide a restoring force and pre-tension the rotating arm to aid in unfolding the tabletop, the user must then apply additional force to overcome this restoring force to fold the tabletop back up. Utility Model Content

[0007] In view of this, the objective of this invention is to create a folding desktop device that is easy for users to operate and provides them with great comfort. Ideally, this folding desktop device should be easy to install and store, flexible in use, sturdy and durable, have a relatively simple structure, and an aesthetically pleasing design.

[0008] To address this problem, the present invention provides a folding desktop device, wherein the means of transportation can be a motor vehicle. The device comprises: a base support; a support arm device coupled to the base support, having a support arm rotatably mounted around a first flip axis, the support arm being rotatable between a retracted position and an extended position, wherein the support arm device is equipped with a first drive device having a first motor device for driving and controlling the flipping motion of the support arm relative to the base support about the first flip axis; and a tabletop device coupled to the support arm, arranged to be rotatable relative to the support arm about a second flip axis different from the first flip axis, wherein the tabletop device is rotatable between a folded position and an unfolded position, wherein the tabletop device has a second drive device having a second motor device for driving and controlling the flipping motion of the tabletop device relative to the support arm about the second flip axis, wherein the tabletop device includes a fixed arm hinged to the support arm and a tabletop, the tabletop being mounted on the fixed arm and rotatable about a rotation axis different from the first and second flip axes.

[0009] This invention provides at least one first motor-assisted drive device for rotating the support arm device relative to the base support, and a second motor-assisted drive device for folding and unfolding the tabletop device relative to the support arm. The first motor device automatically moves the support arm from a fully retracted position within the storage compartment to a position extending out of the storage compartment (in which the support arm device extends upward from the base support, for example, substantially vertically), and vice versa. Furthermore, the second motor device is responsible for the automatic unfolding movement of the tabletop device between a folded position and an unfolded position. The folded position is where the tabletop and support arm are substantially in a straight line or a common plane, and the unfolded position is a flipped position substantially 90° from the folded position, in which the longitudinal direction of the tabletop is substantially perpendicular to the support arm in both directions of the folding movement. All these movements of the support arm device and the tabletop device require no user force or assistance. The user can easily, quickly, and conveniently control this process using control devices, such as pressing corresponding buttons on a control panel, a remote control, or other means. This operation is very simple, minimizing the risk of operational errors and associated risks of damage to the folding tabletop device, vehicle components, and operators.

[0010] In one embodiment of this invention, the base support has two parallel support legs connected to each other by a crossbeam, which has a receiving space for accommodating a first motor unit. These support legs can be fixedly mounted on the floor of a vehicle, such as the underbody structure of a vehicle body, or the floor beneath seats in an aircraft (especially an airplane) or railway car. The crossbeam provides sufficient space to accommodate the motor units for two folding tabletop devices for two adjacent seats.

[0011] In a preferred embodiment, the first motor device is designed as a worm gear drive motor, particularly a DC motor, with the motor side preferably being a non-self-locking worm gear drive. Worm gear drive motors are well-suited for handling high torque at low speeds and can withstand high loads. Furthermore, worm gear drives are highly efficient, low-noise, relatively vibration-free during operation, and can operate for extended periods, making them particularly suitable for this application. The worm gear drive on the motor side is preferably designed to be non-self-locking to facilitate emergency unlocking.

[0012] The first drive unit may further include a drive shaft, one end of which is driven and connected to a worm gear drive motor, and the other end of which is driven and connected to a support arm device via another worm gear on one side of the support arm, so that when the worm gear drive motor is triggered, the support arm rotates relative to the base support around the first tilting axis. The advantages of the worm gear drive also apply to the other worm gear on one side of the support arm.

[0013] Worm gear motors can be mounted with slight rotation around their axis so that the drive shaft is slightly tilted forward in the operating state (from the user's perspective during installation), thereby reducing space requirements. If two motors are mounted on a shared base for two desktops placed side by side, these two motors are preferably arranged vertically within the base's accommodating space and slightly rotated. The drive shafts can have different lengths and run obliquely forward and upward in the operating state to minimize installation space.

[0014] The other worm gear on one side of the support arm is preferably designed as a self-locking gear, so that stepless tilt adjustment can be achieved, and the support arm device connecting the table can maintain a stable position relative to the support arm in any ideal and suitable use position and when external force is applied.

[0015] In a preferred embodiment, the self-locking transmission may have a worm gear mounted on the drive shaft, on which a tool-gripping device can be installed for external manipulation of another worm gear on one side of the support arm. This allows the desktop to be retracted to the folded position when necessary, using tools such as an Allen wrench or similar tools, and these devices (e.g., screws) for emergency unlocking.

[0016] In a preferred embodiment, the support arm assembly has a main shaft and at least one push rod element rotatably mounted on the main shaft. This push rod element is rotaryly driven by a first drive device and fixedly connected to the support arm to convert the rotational motion of the first drive device into a tilting motion of the support arm. The support arm can be fixed to the push rod element by force-locking and / or geometric-locking. In some embodiments, the support arm can be clamped between inner and outer push rod elements and connected to them by a fixing block and such devices by force-locking and / or geometric-locking. In another preferred embodiment, the inner push rod element can be integrally formed with the support arm as a separate component. Thus, the inner push rod element is part of the support arm, eliminating the need for fixing devices and assembly steps.

[0017] A stop device can be provided to limit the rotation range of the support arm about the first tilting axis. For example, the stop device can consist of cylindrical pins fixed to one side of the support arm in the worm gear of another worm gear, which abut against one or more opposing pins fixed to the main shaft. The adjustment range of the support arm about the first tilting axis is greater than 90°, preferably 90° to 110°, and most preferably around 100°. Any adjustment range less than 90° or greater than 110° can also be specified.

[0018] For necessary desktop tilt adjustments, such as approximately 30° or less, no stop is required. The self-locking function of the other worm gear on one side of the support arm is sufficient. However, a stop can be provided if necessary.

[0019] In a preferred embodiment, a spring device can be configured to assist the support arm in rotating relative to the base support. For example, a spring device can be arranged and installed to assist the motor-driven support arm in rotating, at least in certain areas, during the extension movement. The spring device can be configured such that as the tabletop retracts, the tension of the spring device increases, thereby ensuring a smoother, less jittery retraction movement, while as the tabletop extends, the spring device assists the motor through spring force.

[0020] In a specific and effective design of the above-described embodiment, the spring device may include a helical spring, one end of which is suspended from the main shaft of the support arm device, and the other end is supported on the support arm. The helical spring is installed with slight pretension, so that it is taut throughout the entire range of motion of the support arm and exerts an action on the support arm. During the retraction movement, the tension of the helical spring increases, thus supporting a smooth and bump-free movement when the tabletop is retracted. When the tabletop is extended, the helical spring assists the motor with its elasticity.

[0021] In a particularly preferred embodiment, another spring device may be arranged and installed to assist the motor-driven rotation of the support arm during retraction, at least in certain areas. This additional spring device may be configured such that it is tensioned when the tabletop extends and assists the motor in ensuring a smoother, vibration-free, or less vibrating retraction motion when the tabletop retracts.

[0022] In a special design, another spring device may have another helical spring, one end of which is suspended from the push rod element of the support arm device, and the other end is mounted on the rigid bearing. This second helical spring, in the retracted state, is positioned with minimal clearance from the rigid bearing so that it only functions in the latter half of the extension movement, particularly at the end of the extension to counteract the motor force, ensuring a smooth and unobstructed extension and effectively suppressing any upward or over-swinging of the support arm when it reaches the fully extended position. Conversely, when the fully retracted position is reached, the first helical spring counteracts the motor force, effectively suppressing any upward or over-swinging of the support arm there. Therefore, the combination of these two spring devices prevents the tabletop from shifting outside the center of gravity due to inertia, motor drive, and spring tension when reaching one of its end positions. Furthermore, these two spring devices can avoid or at least reduce stick-slip effects or wobbling during the retraction or extension of the support arm.

[0023] In principle, other types of spring devices besides coil springs can be used to achieve the above functions. Appropriate damping devices can also be provided to replace or supplement the spring devices to counteract the overshoot of the support arm or tabletop device. However, coil springs, with their simple and robust structure, have proven to be particularly effective and advantageous.

[0024] The second motor device for driving and controlling the tabletop assembly to rotate relative to the support arm about a second tilting axis can be implemented in various ways, for example, using a worm gear motor, a rotating shaft, and a worm gear drive. In a preferred embodiment, the second motor device is designed as a threaded spindle drive with a motor, particularly a DC motor, and a threaded spindle driven by the motor to rotate. This threaded spindle works in conjunction with a spindle nut connected to the support arm of the tabletop assembly to convert the rotational motion of the threaded spindle into linear motion of the spindle nut. This provides a simple, robust, and efficient linear drive.

[0025] Furthermore, the second drive mechanism may include a support arm, one end of which is hinged to a support arm, and the other end of which is hinged to a fixed arm of the desktop assembly, allowing for relative rotation and movement. Additionally, the support arm is hinged to a spindle nut for drive, enabling the latter to move along the fixed arm. When the motor of the second motor mechanism rotates, the spindle nut passes through a threaded spindle, thereby driving the support arm to fold the desktop assembly out or in. During the unfolding motion, particularly in the unfolded position, the desktop assembly is securely and stably supported on the support arm.

[0026] Preferably, the motor of the second motor unit can be switched off when a predetermined maximum motor current limit is exceeded at the end position where the spindle nut is prevented from moving further linearly. Therefore, the motor continues to run to the corresponding end position and is switched off by the current limit. Clamping protection can also be achieved by the current limit. Such overcurrent fuses are well-known and are typically integrated into the motor as motor protection devices to prevent thermal overload.

[0027] To enhance safety, in a preferred embodiment, a switch can be arranged such that it is activated when the tabletop assembly is in the unfolded position. This prevents the tabletop from retracting when the switch is triggered. A mechanical, electrical, or electronic switch can be configured to provide a signal, such as a signal to a controller, to prevent the tabletop from retracting. Various switches can be used for this purpose, such as contact switches, reed relays, Hall effect sensors, and similar switches.

[0028] In some embodiments, the switch may be mounted on a support arm, which may further support a movable, particularly longitudinally slidable, push rod arranged and configured such that when the tabletop assembly is in the extended position, the push rod engages with one end of the tabletop assembly, and then actuates the switch with its other end. As mentioned above, other switch types may also be used as needed, including mechanical, electrical and electronic, contact and non-contact switches.

[0029] To further simplify operation and provide greater convenience, the tabletop assembly may further include a third drive mechanism, comprising a third motor, for driving and controlling the rotational movement of the tabletop about a rotation axis relative to the fixed arm. This means that the rotational positioning of the tabletop can also be operated electrically or driven by a motor.

[0030] The third drive unit may in particular include a third motor having a preferred self-locking third worm gear transmission. This allows the rotational position of the adjusted tabletop to remain relatively stable.

[0031] Preferably, a sliding clutch can be installed between the third worm gear transmission device and the tabletop, allowing the tabletop to rotate relative to the third motor device, particularly relative to the worm wheel of the third worm gear transmission device, under the action of an external force. When a minimum load is applied to the tabletop, the tabletop can stop rotating, or even rotate in the opposite direction to the third motor, despite the third drive device being operational. This prevents injury to passengers during motor operation or in the event of a collision between the passenger and the tabletop. The sliding clutch also allows for quick and manual adjustment of the tabletop's rotational position at any time.

[0032] While slip clutches can be implemented in various ways, in a particularly simple embodiment, the slip clutch incorporates a damping device, preferably with at least one O-ring inserted between the third worm gear drive and the table, specifically between the worm wheel of the third worm gear drive and the table. Multiple O-rings can also be configured as damping devices. The worm wheel is connected to the table via one or more O-rings in a manner sufficient torsional resistance, so that the table rotates as the worm wheel rotates. However, if necessary, the user can choose to stop the table or manually rotate it. Therefore, anti-pinch protection is also provided.

[0033] In an embodiment of this invention, the third drive device may further include at least one end position switch, so that the tabletop is rotated by the third motor via a third worm gear transmission until the motor switch reaches its end position. Subsequently, the third motor automatically shuts off. If a passenger grips the tabletop, the third motor can be configured to continue rotating only for a predetermined time before automatically shutting off. Preferably, one end position switch is assigned to each direction of rotation.

[0034] Further preferred embodiments of the present invention can be seen from the claims, the following description of preferred embodiments, and the accompanying drawings. Attached Figure Description

[0035] The accompanying drawings do not depict limiting embodiments of the present invention. The same reference numerals are used wherever possible to denote the same parts or components; in this case, unless otherwise specified, all descriptions of the figures apply accordingly. As shown in the figures:

[0036] Figure 1 This is a perspective view of the folding desktop device designed according to this utility model in the usage position.

[0037] Figures 2A-2D yes Figure 1 The folding desktop device in the retracted and folded positions ( Figure 2A ) and the position of extension and unfolding ( Figure 2D Perspective views at different positions between )

[0038] Figure 3 This is an exploded view of an embodiment of the base bracket and the first drive device of the support arm device of the folding desktop device according to the present invention;

[0039] Figure 4 yes Figure 3 A cross-sectional perspective view of the central base support, in which the first motor device is installed;

[0040] Figure 5 It is a partial perspective view showing the first drive unit and Figure 1 The supporting arm assembly of the folding desktop device shown interacts with each other.

[0041] Figure 6 This is a detailed cross-sectional view of the first drive mechanism of the support arm device for a folding desktop device;

[0042] Figure 7 This is a cross-sectional view of one embodiment of the support arm device of the folding desktop device designed according to this utility model;

[0043] Figure 8 This is a cross-sectional perspective view of the first drive unit on one side of the support arm;

[0044] Figure 9 This is a detailed perspective view of the first spring device, which is mainly used to support the extension movement of the support arm device of the folding desktop device designed according to this utility model.

[0045] Figure 10 This is a detailed perspective view of other spring devices used to support the retraction movement of the support arm device of the folding desktop device designed according to this utility model;

[0046] Figure 11 This is a side view of the support arm assembly of the tabletop device in the unfolded position;

[0047] Figure 12 This is a tabletop device of a folding desktop device designed according to the present utility model. The top view from bottom to top illustrates the second and third drive devices of the folding desktop device.

[0048] Figure 13 yes Figure 12 A perspective sectional view of the central tabletop assembly shows the second drive mechanism for the folding motion of the tabletop assembly.

[0049] Figure 14 This is a perspective side view showing the tabletop assembly in its unfolded position;

[0050] Figure 15 The tabletop device of the folding desktop apparatus designed according to this utility model is shown in cross-sectional view as a third drive mechanism for rotating the tabletop; and

[0051] Figure 16 This is a top view of the tabletop device with a third drive mechanism in the folding desktop device designed according to this utility model. Detailed Implementation

[0052] Figure 1 and Figures 2A-2D A folding desktop device 1 designed according to this invention is shown. This device is particularly suitable for motor vehicles, for example, it can be installed on the rear seat console of a motor vehicle, allowing users, passengers, or occupants in the rear seat to comfortably use the folding desktop device. In principle, the folding desktop device can also be installed on the front seats of a car. It can also be used in other vehicles that carry passengers by seats, such as aircraft, especially airplanes, rail vehicles, or ships. Figure 1 The demonstration showed the folding desktop device 1 in its fully extended and unfolded states. Figures 2A-2D This shows the case where the folding desktop device 1 is located in other positions.

[0053] according to Figure 1 It is understood that the folding tabletop device 1 includes a base support 2, a support arm device 3 connected to the base support 2, and a tabletop device 4 connected to the support arm device 3. The support arm device 3 includes a support arm 6 rotatably mounted around a first flip axis A, and the support arm can be rotated as follows: Figure 2A The fully retracted position shown and as Figure 1 and Figures 2B-2D Rotate between the fully extended positions shown. Figure 2AIn the retracted position shown, the support arm assembly 3 is in a horizontal position, and the tabletop assembly 4 spans a generally vertical plane, parallel and coplanar with the support arm 6. In this position, the support arm assembly 3 and the tabletop assembly 4 can be placed in a storage room, for example, near the base support 2, which is not described in detail here. Figure 1 and Figures 2B-2D As shown in the extended position, the support arm assembly 3 with the tabletop assembly 4 extends substantially vertically upward from the storage compartment in order to support the tabletop assembly 4 at the top. A housing (not shown here) can be installed around the base bracket 2 to define the storage compartment. For example, the storage compartment could also be the interior space of the rear seat console.

[0054] The tabletop assembly 4 can rotate or fold relative to the support arm 6 about a second flip axis B, which is different from the first flip axis A. This allows the tabletop assembly 4 to rotate between a folded position and an unfolded position. Figure 2A and Figure 2B In the folded position shown, the tabletop device 4 and the support arm 6 are basically in a straight line or coplanar, while in... Figure 1 , Figure 2C and Figure 2D In the unfolded position shown, the tabletop device 4 is rotated 90° relative to the folded position, so that the longitudinal direction of the tabletop device 4 is basically perpendicular to the support arm 6, and the overall arrangement is basically horizontal. The second flip axis B is basically perpendicular to the first flip axis A. The specific arrangement of the second flip axis B depends on the rotation position of the support arm device 3.

[0055] The tabletop assembly 4 also includes a fixing arm 7, which in Figure 1 Hidden in Figures 12-16 As shown in more detail, the fixed arm is hinged to the support arm 6. There is also a tabletop 8, which is rotatably mounted on the fixed arm 7 about a rotation axis C, different from the first flip axis A and the second flip axis B. Figure 1 , Figure 2C and Figure 2D In the fully extended and unfolded positions shown, the rotation axis C is perpendicular to the first flip axis A and the second flip axis B. The rotation axis C may intersect or be slightly offset from the first flip axis A, or it may intersect or be slightly offset from the second flip axis B. However, the flip axes A and B can be freely defined and do not necessarily have to be as shown in the embodiment.

[0056] In the embodiment shown in the figure, the tabletop 8 is divided into a first tabletop half 8a and a second tabletop half 8b, which are rotatably connected to each other on both longitudinal sides by hinges 9. Therefore, the tabletop half 8a and 8b can be selected as follows: Figure 1 The tabletop 8 shown is unfolded to provide a larger surface area, and can also be selected as... Figures 2A-2D The folding mechanism shown reduces the tabletop surface area or allows it to be stored in a storage room. An embodiment with a single, integrated tabletop is also available.

[0057] According to this utility model, the folding desktop device 1 has multiple motor-assisted drive devices that can rotate the support arm device 3 and the tabletop device 4. Preferably, it can also rotate the tabletop 8 to a desired position so that the folding desktop device 1 can be moved from... Figure 2A The initial positions for retraction, folding, and collapsing shown become... Figure 1 The fully extended and unfolded use positions are shown in the diagram, and vice versa. For simplicity, the process of changing the folding desktop device 1 from its initial folded position to its use position is also referred to as “setting up” the folding desktop device 1, and the reverse process is also briefly referred to as “folding up” the folding desktop device 1.

[0058] like Figure 1 As shown, the drive mechanism includes a first drive unit 11 associated with the support arm assembly 3, which includes a first motor unit 12 for driving and controlling the rotation of the support arm 6 relative to the base bracket 2 about a first flip axis A. The drive mechanism also includes a second drive unit 13 mounted on the tabletop assembly 4, which includes a second motor unit 14 for driving and controlling the rotational movement of the tabletop assembly 4 relative to the support arm 6 about a second flip axis B. Furthermore, the tabletop assembly 4 also includes an optional third drive unit 16, as detailed in [link to details]. Figures 12-16 The device includes a third motor 17 for driving and controlling the rotational movement of the tabletop 8 relative to the fixed arm 7 about the rotation axis C.

[0059] Now refer to Figures 3-16 Explain in more detail Figure 1 The components of the folding desktop device 1 designed according to this utility model are shown below. First, please see... Figure 3 The figure shows the main components of the base bracket 2 and the first drive unit 11. The base bracket 2 has two parallel support legs 18a and 18b, which can be mounted on the floor of a vehicle, such as the console of the rear seat of a motor vehicle, or the floor under the seats of an airplane or train carriage, to stably secure the folding tabletop device 1. The support legs 18a and 18b are connected to each other by a crossbeam 19, the bottom of which has a receiving space 21 for accommodating the first motor device 12. Figure 4 The figure shows a crossbeam 19 with a receiving space 21, which is shown from bottom to top. The figure also shows a first motor device 12 installed in the receiving space 21.

[0060] The first motor assembly 12 is designed here as a worm gear drive motor 22, comprising a first motor 23, a DC motor, and a preferred non-self-locking first worm gear drive 24. The worm gear drive motor 22 can provide high torque at low speeds, withstand high loads, and operate relatively quietly and without vibration, making it ideal for the convenient applications envisioned herein. It is robust and durable, suitable for long-term operation. The first worm gear drive 24 in the worm gear drive motor 22 is preferably designed to be non-self-locking, allowing for emergency unlocking.

[0061] like Figure 3 As shown, the first driving device also includes a drive shaft 26, one end of which is connected to the first worm gear transmission device 24. Figure 3 , Figure 4 and Figure 6 The middle end is the lower end, and the other end is connected to the support arm device 3 via another worm gear 27. Figure 3 and Figure 6 The middle part is the upper end, so that when driving the worm gear transmission motor 22, the support arm 6 can rotate relative to the base bracket 2 around the first flipping axis A.

[0062] The other worm gear 27 on one side of the support arm is preferably designed as a self-locking gear, with its worm 28 meshing with the worm gear 29 on the support arm device 3. The other worm gear 27 in the upper part of the figure can be designed as a special self-locking device to achieve stepless tilt adjustment, and even under the application of external force, it can safely maintain the stable position of the support arm device 3 and the table 8 relative to the base support 2 in the use position at any tilt angle.

[0063] In case of emergency unlocking, a tool can be used to grasp the device 30 from the outside and manually operate the other worm gear 27. Specifically from... Figure 5 and Figure 6 As can be seen, an emergency unlocking device 30, such as a screw (e.g., an Allen screw), can be fixed on the worm gear 28. The worm gear 28 can be turned manually by using a tool (especially an Allen wrench) so that the position of the entire support arm device 3 relative to the base bracket 2 can be manually rotated when necessary.

[0064] from Figures 3-5 It can also be seen that a first drive unit 11' can be mounted on the base bracket 2 to operate another table device (not shown in detail here), specifically extending from and retracting into the base bracket 2. The other table device can be connected to an adjacent seat, for example, in the rear seat assembly of a motor vehicle. The first drive unit 11' then includes a first motor device 12', which contains a worm gear drive motor 22', a drive shaft 26', and another worm gear 27', which contains another worm 28' and another worm wheel 29'.

[0065] Especially from Figures 3-6 As can be seen, each worm gear drive motor 22, 22' can be slightly rotated around its axis, causing the drive shafts 26, 26' to tilt slightly upwards and backwards (viewed from the installation state and direction of travel), thus reducing the required space. Figure 4 and Figure 6 As shown, when the two worm gear drive motors 22 and 22' for the two tabletop devices are installed in the base bracket 2, the two motors can be arranged one above the other and rotate slightly. The drive shafts 26 and 26' can be of different lengths and can extend obliquely backward and upward, thus making the device structure compact and minimizing the required space. Except for minor optional differences in the first drive devices 11 and 11' that can reduce installation space, the other components of the support arm device 3, tabletop device 4, and drive devices 13 and 16 can be designed in a basically similar manner for the two tabletops and can be arranged in a mirror-reversible manner. Alternatively, only one first drive device 11 can be provided, which is only applicable to one tabletop device 4.

[0066] Figure 7 The support arm assembly 3 is shown in more detail in cross-sectional view. The main component of the support arm assembly 3 is the support arm 6, which has a circular opening 31 at one end for rotating the support arm 6. At the other end of the cantilever of the support arm 6, a [missing information - likely a structure or feature] is formed. Figure 7 Hinge component 32 shown (see Figures 12-14 The support arm 6 is rotatably connected to the tabletop device 4 via the hinge component 32, so that the tabletop device 4 can be folded down and retracted relative to the support arm device 3.

[0067] Back Figure 7 (and refer to) Figure 5 and Figure 8 In the illustrated embodiment, the support arm device 3 mainly includes a main shaft 33, an inner bearing sleeve 34 serving as a pivot bearing, a worm gear 29 rotatably mounted relative to the main shaft 33, an inner push rod element 36, an outer push rod element 37, a helical spring 38 inserted between the drive elements 36 and 37, an outer bearing sleeve 39 for pivot mounting, and an outer sleeve 41. The inner bearing sleeve 34 is fixed to the inner push rod element 36 and rotatably mounted on the main shaft. The outer bearing sleeve 39 is fixed to the outer push rod element 37 and rotatably mounted on the outer sleeve 41, which is fixed to the main shaft 33, such as with screws.

[0068] The worm gear 29 can be rotatably fixed to the inner push rod element 36 via a set of screws 42, while the outer push rod element 37 can be screwed onto the inner push rod element 36 via another set of screws 43. The support arm 4 can be clamped between the inner push rod element 36 and the outer push rod element 37, and is rotatably fixed to them via a fixing block 44. Specifically from... Figure 8 As can be seen, one end of the fixing block 44 is fixed to the support arm 6 with a screw, and the other end of the fixing block 44 engages with the groove 46 on the inner push rod element 36 to form a positive rotational connection.

[0069] Although the embodiment shown here provides a support arm 6, an inner push rod element 36, and an outer push rod element 37, which are formed as separate components and interconnected, in principle, these elements 6, 36, and 37 can also constitute a single integral component. The multi-component embodiment allows the coil spring 38 to be mounted in the internal space between the inner push rod element 36 and the outer push rod element 37, the function of which will be explained in detail below.

[0070] Figure 7 and Figure 8 Furthermore, in the illustrated embodiment, a worm gear 29' and another inner and outer push rod elements 36' and 37' belonging to another first drive device 11' associated with another tabletop device are also included. These elements 29', 36', and 37' are no different from the elements 29, 36, and 37 explained above, and therefore the above description also applies. If the folding tabletop device 1 does not include any other tabletop devices besides the tabletop device 4, then elements 29', 36', and 37' can be omitted.

[0071] The end stop device can be used to limit the range of rotation of the support arm 6 around the first tilting axis A. For example... Figure 8 As shown, the end stop can be located at the fulcrum between the worm gear 29 and the main shaft 33. Specifically, the cylindrical pin 47 can be suitably fixed to the surface of the worm gear 29 as a stop, providing the required angular range for rotational movement. One or more pins can be used as reverse stops, for example, connected to the main shaft 33. In the example shown, as the worm gear 29 rotates, a pin 48, such as a slotted pin, passes through the main shaft 33 and engages with the cylindrical pin 47. Therefore, the required adjustment range can be specified to be at least 90°, preferably 90°-110°, and particularly preferably around 100°. The adjustment range can be defined as needed.

[0072] When the tilt of the tabletop 8 is adjusted to a certain degree, such as 30°, no stop is needed. The self-locking function of the upper worm gear 27 is sufficient to achieve this.

[0073] Figure 7The separately shown coil spring 38 forms a spring device 49, which, in the sense of extension movement, supports the rotation of the support arm 6 with motor assistance in at least certain areas. The coil spring 38 is slightly pre-tensioned upon installation and becomes increasingly tighter as the folding tabletop device 1 retracts. This ensures a smooth, shock-free, or low-impact retraction movement. When the folding tabletop device 1 extends, the coil spring 38 supports the first motor device 12 through its elastic force acting in the same direction of rotation. Figure 9 A detailed perspective view of the interior of the inner push rod element 36 is shown. As can be seen from the figure, one end 45a of the coil spring 38 is suspended on the main shaft 33, and the other end 45b engages with the groove 50 on the edge of the opening 31 of the support arm 6 and is firmly fixed or supported on the support arm 6.

[0074] Figure 10 This is a perspective view of the worm gear 29 and the outer side of the inner push rod element 36. As can be seen, an additional spring device 51 can be optionally installed, which serves to support the rotation of the support arm 6 with motor assistance in at least certain areas. This additional spring device 51 is tensioned when the folding tabletop device 1 extends to provide a smoother, shock-free, and / or low-impact extension movement and assists the first motor device 12 in retracting the folding tabletop device 1. For this purpose, the optional additional spring device 51 may include another coil spring 52, which is wound around the outer side of at least one push rod element 36 and 37, in this example, the outer side of the inner push rod element 36. One end 53a is securely fixed to the inner push rod element 36 or the support arm 6, and the other end 53b is fixed to a rigid bearing portion 54 on the base bracket 2. The free end 53b of the other coil spring 52 does not permanently rest against the rigid bearing portion 54, but only contacts the rigid bearing portion during the extension movement, and then the tension increases. Therefore, the other coil spring 52 does not function throughout the entire rotation range, but only within a portion of the rotation range. Another coil spring 52 is particularly effective at the end of the extension movement, but ineffective at the end of the retraction movement.

[0075] Therefore, the two helical springs 38 and 52 are specifically designed to assist the extension and retraction movements and prevent stick-slip or swaying slippage. Thus, at the end of the extension or retraction movement, the helical springs 38 and 52 effectively suppress the upward thrust or overshoot of the support arm 6 when it reaches the fully extended or fully retracted position. Without these two springs, the tabletop device 4, upon reaching one of its end positions, might move outside its center of gravity due to inertia and the motor, resulting in overshoot. The two mutually canceling and coordinating helical springs 38 and 52 effectively prevent this overshoot. In principle, other spring devices besides the helical springs can also achieve the above functions. In addition to spring devices 49 and 51, appropriate damping devices can also be provided to counteract the overshoot of the tabletop device 4. Using helical springs 38 and 52 can solve the overshoot problem very effectively, simply, and advantageously. In principle, at least one more helical spring 52 can be omitted.

[0076] Refer to Figure 7 and Figure 11 It can be seen that the support arm device 3 also includes a switch device 56 for detecting and indicating the unfolded position of the tabletop device 4. For this purpose, in the illustrated example, the switch device 56 includes a mechanically operable switch 57, a guide rail 58 mounted on the support arm 6, and a push rod 59. The push rod 59 is mounted in the guide rail 58 and undergoes longitudinal displacement under the guidance of the guide rail. Under the biasing action of a biasing device, particularly a coil spring 61, the push rod moves outward from the opening 31 of the support arm 6 towards the tabletop device 4. The tabletop device 4 is in... Figure 11 In the unfolded position, the push rod 59 is pushed into the guide rail 58 by the coil spring 61. The inner end of the push rod 59 then contacts and actuates the switch 57, which is also connected to the guide rail 58. For example, the switch 57 can provide an electrical signal to the controller (not shown in detail here) upon activation to indicate that the table unit 4 is in the unfolded position. As long as the table unit 4 is in the unfolded position, the controller prevents the folding table unit 1 from retracting to avoid collisions between the table unit 4 and other components inside the vehicle, such as the outer shell or rear seat console, which could potentially damage the folding table unit 1 or other vehicle components.

[0077] See Figures 12-14The figure shows in more detail a second drive unit 13 with a second motor assembly 14, which drives and controls the rotational movement of the tabletop assembly 4 relative to the support arm 6 about a second flip axis B. As shown, the second motor assembly 14 includes a threaded spindle 63 driven to rotate by a motor 62, particularly an electric motor, which cooperates with a spindle nut 64 to convert the rotational movement of the threaded spindle 63 into the linear movement of the spindle nut 64. The spindle nut 64 is mounted on a bearing seat 66 and is longitudinally movable relative to the fixed arm 7 and the tabletop 8. A hinge 67 with a hinge axis 68 is connected to the bearing seat 66. The second drive unit 13 also includes a support beam 69, one end of which is rotatably connected to the bearing seat 66 relative to the hinge 67, and thus rotatably connected to the fixed arm 7 of the tabletop assembly 4. Therefore, the support beam 69 is also driven to and guided by the spindle nut 64 via the hinge 67, and thus movable along the fixed arm 7. At the other end, the support beam 69 is rotatably connected to the support arm 6 via another hinge 71 and another hinge shaft 72.

[0078] When the second motor device 14 rotates, the bearing seat 66 with the main shaft nut 64 moves linearly through the threaded main shaft 63, thereby driving the support beam 69 through the hinge 67. In this way, the tabletop device 4 folds inward or outward around the second flip axis B according to the rotation direction of the motor 62 of the second motor device 14. The support beam 69 can rotate relative to the support arm 6 via another hinge 71 around another hinge axis 72 to achieve the folding movement. During the folding movement and in the fully unfolded position, the fixed arm 7 is supported on the support arm 6 by the support beam 69 via the hinge 67.

[0079] Preferably, the motor 62 is configured such that when it reaches the end position that prevents the spindle nut 64 from continuing to run, and the predetermined maximum current limit of the motor current is exceeded, the motor will shut down. Even if the end position is not reached, the motor 62 will shut down immediately after reaching the motor current limit to ensure anti-pinch protection.

[0080] Figure 12 Display table device 4 (e.g.) Figure 2A , Figure 2B (As shown) is in the folded position, where the tabletop 8 and support beam 69 are both basically parallel to the support arm 6, while Figure 14 The tabletop device 4 on display is in the unfolded position (e.g.) Figure 1 , Figure 2C , Figure 2D As shown in the figure, the tabletop 8 is basically perpendicular to the support arm 6, and the support beam 69 is obliquely aligned with the tabletop device 4 and the support arm 6 to form a horizontal brace and support the tabletop device 4 on the support arm 6.

[0081] Please refer to this document. Figure 12 , Figure 15 and Figure 16 The third drive unit 16 and the third motor unit 17 will be described in detail below. They are used to drive and control the tabletop 8 to rotate relative to the fixed arm 7 around the rotation axis C. In principle, the rotation of the tabletop 8 can also be performed manually, but it is preferable to use the motor-assisted rotation of the tabletop 8 because it provides additional convenience and, together with the rotation of the support arm unit 3 and the tabletop unit 4, enables the fully automatic electric setting of the folding tabletop unit 1, placing it in the use position or in a position suitable for storage.

[0082] In the embodiment shown in the figure, the third motor device 17 has a third motor 73, specifically a motor or worm gear drive motor with a third worm gear transmission 74. In the preferred embodiment shown in this figure, the third worm gear transmission 74 is self-locking.

[0083] It should be noted that the terms “first,” “second,” and “third” used herein do not indicate any order or importance of the specified elements, but are used to distinguish one element from one or more other similar or identical elements for ease of reference. The description of a “second” element, a “third” element, or a similar element does not presuppose the existence of a “first” element, or both “first” and “second” elements, or similar elements.

[0084] Special reference Figure 15 The figure shows in detail, in cross-sectional view, the table assembly 4 with a third drive unit 16 and its components. The table assembly 4 includes a fixed arm 7, a table 8, and a third motor 73 with a third worm gear drive 74, which includes a worm gear 76. The table assembly 4 also includes a ring 77 connected to the bottom of the table, with an end-position locking device 78 providing mechanical stop for a 180° offset position of the table 8. A corresponding brake pin 79, cooperating with the end-position locking device 78 to determine the end position, is fixed to the fixed arm 7 together with the third motor 73.

[0085] When the tabletop 8 rotates via a motor, a first switch 81 and a second switch 82 are further provided at the rotating end position of the tabletop 8. From Figure 16As can be seen, end position switches 81 and 82 are mounted on the ring 77, and therefore also on the tabletop 8, offset by 180° relative to the rotation axis C. The first switch 81 can be assigned to the in-rotation position of the tabletop 8, while the second switch 82 can be assigned to the out-rotation position after rotating 180°. When the folding tabletop device 1 is electrically operated, the tabletop 8 rotates via the third worm gear transmission 74 until it reaches one of the first end position switches 81 and the second end position switch 82. Then, each end position switch 81 and 82 can provide an electrical signal to the controller, indicating that its respective rotation end position has been reached, at which point the controller can stop the third motor 73.

[0086] In a preferred embodiment of the folding tabletop device 1 designed according to this invention, as shown in the figure, a sliding clutch 83 is installed between the worm gear 76 of the third worm gear transmission device 74 and the tabletop 8. The sliding clutch 83 allows external force to be applied, manually rotating the tabletop 8 relative to the worm gear 76 of the third worm gear transmission device 74. When the tabletop 8 is rotated by the motor, a person can apply a minimum load force to the tabletop to stop its rotation, or even make its rotation direction opposite to the rotation direction of the third motor 73. This prevents injury to passengers when the engine is running, or from collisions with the tabletop 8 in other situations. This method also provides anti-pinch protection. Furthermore, passengers can quickly set or adjust the rotation position of the tabletop by hand at any time.

[0087] In the embodiment shown in the figure, the slip clutch 83 includes two O-rings 84, which are inserted as damping devices and lightly clamped between the tabletop 8 and the worm gear 76 of the third worm gear transmission 74. The worm gear 76 is rotatably mounted on a sliding bearing 86, which is supported by a pin 87. The pin 87 is fixed to the tabletop 8 with screws, and the worm gear 76 can rotate freely on or relative to the pin 87. When the worm gear 76 rotates, the tabletop 8 is lifted by the damping O-rings 84. Passengers can choose to stop or further manually adjust the tabletop 8.

[0088] The working principle of the folding desktop device 1 is as follows:

[0089] Assuming the folding desktop device 1 is in Figure 2AThe state shown is such that the support arm device 3 is fully retracted, the tabletop device 4 is folded in, and the tabletop 8 is folded closed and rotated to its original position. If the folding tabletop device 1 is now to be moved to the usage position, the passenger can press a suitable control button, the simplest way being to press a button on the control panel or controller, to initiate the automatic setup process for moving the folding tabletop device 1 to the usage position. The controller, not shown in detail here, then appropriately controls the first drive unit 11, the second drive unit 13, and the third drive unit 16 to execute the setup process. The first drive unit 11 extends the support arm device 3 to... Figure 2B The fully extended position is shown, at which point the support arm device 3 extends substantially vertically upwards. The second drive device 13 unfolds the tabletop device 4 to... Figure 2C In the unfolded position shown, the tabletop 8 is substantially horizontal. The third drive unit 16 uses a motor to move the tabletop 8 from... Figure 2C The indicated rotation position is rotated to Figure 2D The tabletop 8 is shown in a 180° rotation position. In this position, if the tabletop 8 has two hinged tabletop halves 8a and 8b, the user can unfold the tabletop halves to form a single tabletop 8, as shown. Figure 1 As shown, the surface area of ​​the tabletop has increased.

[0090] If needed, the tabletop 8 can also be tilted slightly. For this purpose, the motor can be set to any desired tilt angle for the support arm 6 and the tabletop assembly 4. The rotational position of the tabletop 8 can be adjusted via the motor. The rotational position of the tabletop 8 can also be adjusted manually.

[0091] If the folding desktop device 1 is to be stored away again, such as in the console of a car's rear seat, the drive units 11, 13, and 16 will activate in the opposite manner when the user controls or triggers them via the control device, so that the folding desktop device 1 automatically rotates in, folds, and retracts. Figure 2A The location shown.

[0092] More advantageously, the installation and folding of the folding tabletop device 1 can be fully automated and controlled by drive units 11, 13, and 16. There is no risk of misoperation of the folding tabletop device 1, nor is there any risk of damage to the folding tabletop device 1 or vehicle parts, or injury to the operator. The electrically assisted folding tabletop device 1 is characterized by its ease of use and high comfort. Its structure is relatively simple, allowing for quick and convenient installation and storage, flexible use, and robust durability.

[0093] It is worth noting that the description of the operations of extending the support arm device 3, unfolding the tabletop device 4, and rotating the tabletop 8 as sequential operations is merely for simplicity and clarity. The control device of the folding desktop device 1 designed according to this invention can effectively achieve the following: the first, second, and third drive devices 11, 13, and 16 can be operated substantially in parallel to simultaneously execute the extension or retraction movements of the support arm device 3, the extension or retraction movements of the tabletop device 4, and the rotational movements of the tabletop 8 as parallel as possible. For example, the controller can instruct the second drive device 13 and the third drive device 16 to simultaneously fold and rotate the tabletop device substantially in parallel, provided that the support arm device 3 is sufficiently outside the storage compartment, thereby achieving these folding and rotational movements. In this way, the folding desktop device 1 can be set up or folded up very quickly, allowing all components to move smoothly and in a coordinated manner, further enhancing the aesthetics of the folding desktop device 1 designed according to this invention.

[0094] An electrically operated folding tabletop device 1 for use in vehicles, particularly motor vehicles, comprises a base support 2, a support arm assembly 3 connected to the base support 2 and having a support arm 6 mounted to rotate about a first folding axis A, and a tabletop assembly 4 connected to the support arm 6 and rotatable relative to the support arm 6 about a second folding axis B. The tabletop assembly 4 has a fixed arm 7 hinged to the support arm 6 and a tabletop 8 mounted on the fixed arm 7, rotatable about a rotation axis C. Each folding axis A, B is equipped with a drive unit 11, 13 with motor assemblies 12, 14 for driving and controlling the movement of the respective folding axis A, B. An additional motor-assisted drive unit 16 may also be provided for driving and controlling the rotational movement of the tabletop 8 about the rotation axis C.

Claims

1. A folding desktop device (1), characterized in that: Base support (2); The support arm device (3) is connected to the base bracket (2) and has a support arm (6) that is rotatably mounted around a first flip axis (A). The support arm can flip between a retracted position and an extended position. The support arm device (3) has a first drive device (11, 11') associated thereto, which includes a first motor device (12, 12') for driving and controlling the flipping movement of the support arm (6) relative to the base bracket (2) around the first flip axis (A). as well as A tabletop device (4) coupled to the support arm (6) is arranged to rotate relative to the support arm (6) about a second rotation axis (B) different from the first rotation axis (A). The tabletop device (4) can rotate between a folded position and an unfolded position. The tabletop device (4) has a second drive device (13) including a second motor device (14) for driving and controlling the rotational movement of the tabletop device (4) relative to the support arm (6) about the second rotation axis (B). The tabletop device (4) has a fixed arm (7) that is hinged to the support arm (6) and a tabletop (8). The tabletop is mounted on the fixed arm (7) and can rotate about a rotation axis (C) that is different from the first flip axis (A) and the second flip axis (B).

2. The folding desktop device (1) according to claim 1, characterized in that: The base support (2) includes two parallel support legs (18a, 18b) which are connected to each other by a crossbeam (19), wherein the crossbeam (19) includes a receiving space (21) for accommodating the first motor device (12, 12').

3. The folding desktop device (1) according to claim 1, characterized in that: The first motor device (12, 12') is designed as a worm gear drive motor (22, 22'), with a first motor (23) and a non-self-locking first worm gear drive device (24).

4. The folding desktop device (1) according to claim 3, characterized in that, The first driving device (11, 11') includes a drive shaft (26, 26'), one end of which is drivenly connected to the worm gear drive motor (22, 22'), and the other end is drivenly connected to the support arm device (3) through another worm gear (27, 27'), so that when the worm gear drive motor (22, 22') is started, the support arm (6) rotates relative to the base bracket (2) around the first flipping axis (A).

5. The folding desktop device (1) according to claim 4, characterized in that: The other worm gear (27, 27') is designed as a self-locking gear and includes a worm (28, 28') on which a device (30) is mounted, the device (30) being configured to be gripped from the outside by a tool so as to manually operate the other worm gear (27, 27').

6. The folding desktop device (1) according to any one of claims 1-4, characterized in that: The support arm device (3) has a main shaft (33) and at least one push rod element (36, 37; 36', 37'), the push rod element is rotatably mounted on the main shaft (33), driven to rotate by the first drive device (11, 11'), and is connected to the support arm (6) in a rotationally fixed manner.

7. The folding desktop device (1) according to any one of claims 1-4, characterized in that: The stop devices (47, 48) limit the rotation range of the support arm (6) around the first rotation axis (A).

8. The folding desktop device (1) according to any one of claims 1-4, characterized in that: The arrangement and configuration of the spring device (49) are intended to support the rotation of the support arm (6) under the drive of the motor, that is, the extension movement at least within a certain area.

9. The folding desktop device (1) according to claim 8, characterized in that: The spring device (49) includes a helical spring (38), one end (45a) of which is suspended on the main shaft (33), and the other end (45b) abuts against the groove (50) on the support arm (6).

10. The folding desktop device (1) according to claim 8, characterized in that: Another spring device (51) is also arranged and set to support the rotation of the support arm (6) under the drive of the motor, that is, the retraction movement at least within a certain area.

11. The folding desktop device (1) according to claim 10, characterized in that: The other spring device (51) includes another helical spring (52), one end (53) of which is suspended in the push rod element (36) of the support arm device (3), and the other end (53b) abuts against the rigid bearing portion (54).

12. The folding desktop device (1) according to any one of claims 1-4, characterized in that: The second motor device (14) includes a threaded spindle (63) driven to rotate by a motor (62), the threaded spindle (63) cooperating with a spindle nut (64) coupled to the fixed arm (7) of the table device (4) to convert the rotational motion of the threaded spindle (63) into the linear motion of the spindle nut (64).

13. The folding desktop device (1) according to claim 12, characterized in that: The second drive device (13) includes a support beam (69), one end of which is hinged to the support arm (6), and the other end is rotatably and slidably connected to the fixed arm (7) of the table device (4) via a hinge (67). The support beam (69) is further driven to the spindle nut (64) via the hinge (67), thereby sliding along the fixed arm (7).

14. The folding desktop device (1) according to claim 12, characterized in that: The motor (62) of the second motor device (14) is installed to shut off when the motor current exceeds a predetermined maximum current limit when it reaches the end position.

15. The folding desktop device (1) according to any one of claims 1-4, characterized in that: The switch (57) is installed and set to be activated when the tabletop device (4) is in the extended position.

16. The folding desktop device (1) according to claim 15, characterized in that: The switch (57) is mounted on the support arm (6), which also has a movable push rod (59). One end of the push rod (59) engages with the tabletop device (4), and the other end is used to drive the switch (57).

17. The folding desktop device (1) according to claim 1, characterized in that: The tabletop device (4) includes a third drive device (16), which includes a third motor device (17) for driving and controlling the rotational movement of the tabletop (8) about the rotation axis (C) relative to the fixed arm (7).

18. The folding desktop device (1) according to claim 17, characterized in that: The third drive unit (16) includes a third motor (73) and a self-locking third worm gear (74).

19. The folding desktop device (1) according to claim 18, characterized in that: A sliding clutch (83) is installed between the third worm gear (74) and the table (8) so that the table (8) can rotate relative to the third motor device (17) under the action of external force.

20. The folding desktop device (1) according to claim 18, characterized in that: A sliding clutch (83) is installed between the third worm gear (74) and the table (8) so that the table (8) can rotate relative to the third worm gear (74) under the action of external force.

21. The folding desktop device according to claim 19, characterized in that: The slip clutch (83) includes a damping device comprising at least one O-ring (84) inserted between the third worm gear (74) and the table (8).

22. The folding desktop device according to any one of claims 17-21, characterized in that: The third drive device (16) includes at least one end position switch (81, 82).

23. The folding desktop device according to claim 1, characterized in that: The folding desktop device is used in vehicles.

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