A bottom telescopic and directional universal wheel linkage mechanism and electric suitcase

Abstract

The utility model belongs to the field of luggage, concretely is a kind of bottom telescopic and directional universal wheel linkage mechanism and electric luggage, including mounting bracket, universal wheel subassembly, telescopic subassembly and switching subassembly;Universal wheel subassembly includes universal wheel and the wheel shaft synchronous rotation with universal wheel, telescopic subassembly includes telescopic link;Switching subassembly is hingedly connected on mounting bracket, and the directional piece for locking wheel shaft rotation is equipped on the first action end of switching subassembly, and the driven piece that is linked with telescopic link is equipped on the second action end;The telescopic movement of telescopic link is driven switching subassembly to rotate around its hinged axle by driven piece, to make directional piece switch between locking position and release position;When directional piece is in locking position, it is engaged with wheel shaft and restricts wheel shaft rotation, and universal wheel is in directional state;When directional piece is in release position, it is separated from wheel shaft, and universal wheel is in universal state.The application has the advantages of compact structure, convenient operation and automatic realization of universal wheel state switching.

Description

Technical Field

[0001] This utility model belongs to the field of luggage technology, specifically a bottom telescopic and directional universal wheel linkage mechanism and an electric luggage. Background Technology

[0002] Casters (also known as omnidirectional wheels) are widely used on mobile devices such as suitcases, trolleys, and office chairs due to their ability to rotate 360 ​​degrees, greatly improving the flexibility and ease of movement. However, in certain scenarios, this flexibility can become a disadvantage. For example, when riding an electric suitcase, the omnidirectional wheel mode can make it difficult to control the direction, resulting in poor straight-line stability and potential safety hazards. Furthermore, when the device needs to travel in a straight line for an extended period, the omnidirectional wheel mode can easily cause yaw, requiring the user to constantly correct the direction, increasing the operational burden.

[0003] To address these issues, the industry typically equips devices with both directional and omnidirectional wheels, or equips the omnidirectional wheels with a locking mechanism to switch to directional mode. Traditional switching methods are mostly manual, such as locking the wheels' steering function directly by stepping on or manually moving a separate latch or lever. This method has several drawbacks: First, it's inconvenient to operate, often requiring users to bend over or operate while moving, resulting in a poor user experience; second, the exposed mechanical structure is prone to accidental switching due to collisions or accidental activation, leading to insufficient reliability; third, for products with high integration requirements, such as electric luggage, traditional external switching mechanisms occupy a large space, affecting the overall aesthetics and structural layout.

[0004] With the development of smart travel products, especially the emergence of electric suitcases, users have placed higher demands on ease of operation and intelligence. Therefore, the market urgently needs a mechanism that can be linked with other functions of the device (such as telescopic handles), has a compact structure, is simple and reliable to operate, and can automatically switch between omnidirectional and directional modes. Utility Model Content

[0005] To address the problems mentioned above, the present invention provides a bottom telescopic and directional universal wheel linkage mechanism and an electric luggage case, which have the advantages of compact structure, convenient operation, and automatic switching of universal wheel status.

[0006] The first objective of this utility model is to provide a bottom telescopic and directional universal wheel linkage mechanism, comprising:

[0007] Mounting rack;

[0008] The caster wheel assembly is located at the bottom of the mounting bracket. The caster wheel assembly includes casters and axles. The rotation of the casters drives the axles to rotate synchronously.

[0009] A telescopic assembly, installed within the mounting frame, includes a telescopic rod;

[0010] The switching components are linked to the telescopic rod and the swivel wheels respectively, allowing the swivel wheels to switch between a directional state and a swivel state.

[0011] Furthermore, one end of the switching component is provided with a directional element for locking the rotation of the wheel shaft.

[0012] Furthermore, the other end of the switching component is equipped with a follower located behind the telescopic rod.

[0013] Furthermore, the switching assembly is hinged to the mounting bracket. The switching assembly includes a first working end and a second working end arranged opposite to each other. A guide member is located at the first working end, and a driven member is located at the second working end. The telescopic movement of the telescopic rod is linked to the rotation of the switching assembly around its hinge axis by the driven member, so that the guide member switches between the locked position and the released position.

[0014] When the directional component is in the locked position, it engages with the axle to restrict the rotation of the axle, thus oriented the swivel wheel; when the directional component is in the released position, it separates from the axle, allowing the axle to rotate freely and oriented the swivel wheel.

[0015] Furthermore, the switching assembly includes a swing arm, the middle of which is hinged to the mounting bracket via a first hinge axis;

[0016] The driven member is located at one end of the swing arm, the directional member is located at the other end of the swing arm, and the axis of the first hinge shaft is parallel to the axis of the wheel axle.

[0017] Furthermore, the telescopic rod extends and retracts between the first and second extreme positions;

[0018] When the telescopic rod extends to the first limit position, the telescopic rod separates from the driven member, and the directional member remains in the locked position under the action of the reset element;

[0019] When the telescopic rod retracts to the second limit position, the telescopic rod acts on the driven member, causing the switching component to rotate until the directional member is in the release position.

[0020] Furthermore, the reset element is a torsion spring installed on the switching assembly. When the telescopic rod extends to the first limit position, the torsion spring applies a force to the directional member to lock the axle.

[0021] Furthermore, the directional component is a limiting post, and a limiting hole is provided on the wheel axle for the limiting post to be inserted. When the directional component is in the locked position, the limiting post is inserted into the limiting hole.

[0022] Furthermore, the first working end of the switching component is provided with a mounting groove, and a pin is provided in the mounting groove. The limiting post is rotatably connected to the pin through a bushing.

[0023] Furthermore, the caster wheel assembly also includes a wheel frame, on which a sleeve is formed for the wheel axle to pass through. The wheel axle is rotatably disposed in the sleeve. The sleeve has a clearance hole that communicates with the limiting hole. The limiting pin passes through the clearance hole and is inserted into the limiting hole.

[0024] Furthermore, the outer periphery of the clearance hole is provided with a guide protrusion that protrudes towards the switching component, and the guide protrusion has a positioning curved surface that fits against the outer peripheral surface of the bushing.

[0025] Furthermore, the driven member is a lever located at the second working end, the axis of which is parallel to the axis of the wheel axle; the lever is located at the rear end of the telescopic rod and is separately disposed from the telescopic rod.

[0026] The second objective of this utility model is to provide an electric suitcase, comprising:

[0027] A rideable box;

[0028] For example, the bottom telescopic and directional universal wheel linkage mechanism of any of the above items, the mounting frame is the frame of the box;

[0029] The front upright is connected to the telescopic rod at its bottom. The front upright is configured such that when the front upright is extended and the box is in riding mode, the swivel wheels switch to directional mode; when the front upright is retracted and the box is in non-riding mode, the swivel wheels switch to swivel mode.

[0030] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0031] (1) The linkage mechanism of this application includes a swivel wheel assembly, a telescopic assembly, and a switching assembly. The switching assembly is hinged to the mounting bracket. The first working end of the switching assembly is provided with a directional member for locking the rotation of the wheel axle, and the second working end is provided with a driven member that works in conjunction with the telescopic rod. The telescopic movement of the telescopic rod drives the switching assembly to rotate around its hinge axis through the driven member, so that the directional member switches between the locked position and the released position. Thus, by using the telescopic assembly as a power source and linking it with the switching assembly of the lever structure, the automatic switching action of the swivel wheel is realized. This linkage mechanism is particularly suitable for intelligent devices such as electric luggage boxes. It utilizes the existing telescopic structure to realize the change of the swivel wheel state. When it is necessary to change the riding state, the wheel axle locking state can be switched automatically in sync, which significantly improves the safety and ease of operation.

[0032] (2) The linkage mechanism of this application specifically sets the switching component as a swing arm with a central hinge, with the driven part and the directional part located at both ends, forming a lever-like structure, thereby converting the linear motion of the telescopic rod into the rotational locking action of the swing arm. The overall structure is simple, and the force transmission path is clear and reliable, ensuring stable switching between the omnidirectional wheel and the directional wheel. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is an overall structural diagram of the linkage mechanism provided in one embodiment of this application;

[0035] Figure 2 This is a structural diagram illustrating the cooperation between the caster wheel assembly and the switching assembly provided in an embodiment of this application.

[0036] Figure 3 This is a structural diagram of a switching component provided in an embodiment of this application;

[0037] Figure 4 This is a structural diagram of a caster wheel assembly provided in one embodiment of this application;

[0038] Figure 5 A schematic diagram showing the guide member in the released position after the telescopic rod is retracted, according to an embodiment of this application;

[0039] Figure 6 A schematic diagram showing the guide member in the locked position after the telescopic rod is extended, according to an embodiment of this application;

[0040] Figure 7 This is a structural diagram of an electric suitcase provided in an embodiment of this application.

[0041] Wherein: 1-Mounting bracket, 2-Wheel assembly, 21-Wheel, 22-Axle, 23-Wheel frame, 231-Sleeve, 232-Leaning hole, 233-Guide protrusion, 3-Telescopic assembly, 31-Telescopic rod, 4-Switching assembly, 41-First acting end, 42-Second acting end, 43-Directional component, 44-Driven component, 45-Swing arm, 46-First hinge shaft, 47-Reset element, 48-Pin, 49-Busset, 5-Front upright. Detailed Implementation

[0042] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0043] In existing technologies, omnidirectional wheels are widely used in mobile devices due to their flexible rotation characteristics. However, in scenarios involving riding electric luggage or straight-line travel, their free-steering nature makes directional control difficult. Based on this, this application analyzes the correlation between the extension and retraction of the front upright of the luggage compartment and the riding state, proposing to use the telescopic component as a power source and utilize the lever principle to convert linear motion into a rotational locking action. This utility model provides a bottom telescopic and directional omnidirectional wheel linkage mechanism, which can be applied to mobile devices such as luggage, strollers, and scooters; the mobile device can also be a mobile chassis used in conjunction with other functional modules, serving as a basic moving component. The following embodiments of this application illustrate the application of the switching mechanism in a luggage compartment, but are not limited to this.

[0044] See Figures 1 to 6 The linkage mechanism provided in this application includes a mounting frame 1, a universal wheel assembly 2, a telescopic assembly 3, and a switching assembly 4. The mounting frame 1 provides a mounting base for the universal wheel assembly 2, the telescopic assembly 3, and the switching assembly 4, allowing the above components to be integrated together. When applied to an electric luggage box, the mounting frame 1 can be the frame or bottom plate of the luggage box body, etc. It is a mounting frame in a broad sense and is not specifically limited to a plate structure or a frame structure. The universal wheel assembly 2 is located at the bottom of the mounting frame 1. The universal wheel assembly 2 includes a universal wheel 21 and a wheel axle 22. The rotation of the universal wheel 21 drives the wheel axle 22 to rotate synchronously. It can be understood that when the wheel axle 22 rotates freely, the universal wheel 21 is in a universal state. When the rotation of the wheel axle 22 is restricted, the universal wheel 21 can change to a directional state. Therefore, the focus of this application is on how to selectively lock the rotation of the wheel axle 22 synchronously according to the driving state, so that the universal wheel 21 presents different states in different driving states.

[0045] The telescopic assembly 3 is housed within the mounting frame 1. The telescopic assembly 3 includes a telescopic rod 31, which can freely move in and out of the mounting frame 1 under the action of a driving force. The telescopic rod 31 in this application can be the bottom telescopic rod of an electric suitcase. The telescopic rod 31 is equipped with a front upright 5, thereby realizing the linkage between the bottom telescopic structure of the electric suitcase and the omnidirectional wheel conversion. This results in a higher degree of integration and eliminates the need for an additional drive mechanism for the omnidirectional wheel conversion. It is understood that electric suitcases, as rideable tools, typically have a separate telescopic mechanism at their bottom. This application cleverly utilizes the driving force inherent in the suitcase itself to achieve the switching of the omnidirectional wheels.

[0046] The switching assembly 4 is hinged to the mounting bracket 1. The switching assembly 4 includes a first working end 41 and a second working end 42 arranged opposite to each other. The first working end 41 is provided with a directional member 43 for locking the rotation of the wheel axle 22. It can be understood that the purpose of the directional member 43 is to cooperate with the wheel axle 22 to restrict or release the wheel axle 22. Therefore, the specific structure of the directional member 43 is not limited. For example, the directional member 43 can be a limiting pin, with a limiting hole (through hole or blind hole) on the wheel axle 22, the size and depth of which match the limiting pin. The limiting pin is inserted into the limiting hole to restrict the wheel axle 22. Alternatively, the directional member 43 can be a brake pad or a pawl, etc. The rotation of the switching assembly 4 causes the directional member 43 to mechanically interfere with the wheel axle 22 to achieve locking. The second working end 42 is provided with a driven member 44 that is linked to the telescopic rod 31. The telescopic movement of the telescopic rod 31 drives the switching assembly 4 to rotate around its hinge axis through the driven member 44, causing the directional member 43 to switch between the locked position and the released position (e.g., ...). Figure 6 To release the position, Figure 7 (In the locked position); when the directional member 43 is in the locked position, it engages with the axle 22 to restrict the rotation of the axle 22, so that the universal wheel 21 is in a directional state; when the directional member 43 is in the released position, it separates from the axle 22, and the axle 22 rotates freely, so that the universal wheel 21 is in a universal state.

[0047] It should be noted that the switching component 4 rotates around a hinge axis between two specific positions, such as the first position and the second position. When the switching component 4 rotates to the first position, the guiding member 43 is in a locked state; when the switching component 4 rotates to the second position, the guiding member 43 is in a released state. The rotation of the switching component 4 between the first and second positions is achieved through the extension and retraction of the telescopic rod 31. The driven member 44, as the component in direct contact with the telescopic rod 31, bears the responsibility of force transmission; therefore, its specific structure is not limited and can be a columnar lever, a block, etc.

[0048] This application integrates the telescopic component 3 and the switching component 4, enabling automatic switching using the existing telescopic structure of the device. This is particularly suitable for smart devices such as electric luggage. When the current pole 5 extends or retracts to change the riding state, the locking state of the wheel axle 22 can be switched automatically and simultaneously, significantly improving safety and ease of operation. More specifically, through the linkage of the telescopic pole 31, the driven member 44, the switching component 4, and the directional member 43, the linear motion of the telescopic pole 31 is effectively converted into the rotational motion of the switching component 4 via the driven member 44, and ultimately into the locking action of the directional member 43. Mode switching can be achieved without additional operation, and the force transmission path is clear and reliable, ensuring stable switching between omnidirectional and directional states.

[0049] In some embodiments, see Figure 3The switching assembly 4 includes a swing arm 45, the middle of which is hinged to the mounting bracket 1 via a first hinge shaft 46. A driven member 44 is located at one end of the swing arm 45, and a guide member 43 is located at the other end of the swing arm 45. The axis of the first hinge shaft 46 is parallel to the axis of the wheel axle 22. By specifically configuring the switching assembly 4 as a swing arm 45 with a central hinge, and the driven member 44 and the guide member 43 located at both ends, a lever-like structure is formed. The telescopic rod 31 only needs to apply a small stroke to the driven member 44 to cause the guide member 43 to produce a relatively large displacement, thereby achieving separation from the wheel axle 22. Furthermore, by designing the axial direction of the first hinge shaft 46 to be parallel to the axis of the wheel axle 22, it is ensured that the swing arm 45 rotates in a plane perpendicular to the axis of the wheel axle 22, so that the movement trajectory of the guide member 43 fixed at one end of the swing arm 45 can be controlled, achieving more accurate and reliable locking of the wheel axle 22.

[0050] Specifically, the middle part of the swing arm 45 forms a fixed fulcrum with the mounting bracket through the first hinge shaft 46, constituting a lever structure centered on this fulcrum. When the telescopic rod 31 extends or retracts, its end contacts the driven member 44 at one end of the swing arm 45 and applies a thrust, forcing the swing arm 45 to rotate around the first hinge shaft 46. Since the axis of the first hinge shaft 46 is parallel to the axis of the wheel axle 22, the plane of rotation of the swing arm 46 always remains perpendicular to the axis of the wheel axle 22, causing the directional member 43 at the other end of the swing arm 46 to undergo linear displacement along the radial direction of the wheel axle 22. During locking, the directional member 43 is precisely inserted into the limiting hole along the radial direction of the wheel axle 22, avoiding tilting and jamming caused by axis misalignment; during release, the directional member 43 exits the limiting hole along the same path, ensuring the repeatability of the action trajectory. It should be noted that the swing angle of the swing arm 45 in this application is small, and no large positioning offset will occur during locking.

[0051] In other embodiments (not illustrated), the axis of the second hinge shaft is perpendicular to the axis of the wheel axle 22. The difference from the embodiments described above is that by designing the axis of the second hinge shaft to be perpendicular to the axis of the wheel axle 22, the swing plane of the swing arm 45 and the direction of action of the guide member 43 are changed. That is, the swing of the swing arm 45 drives the guide member 43 to move along or substantially along the axial direction of the wheel axle 22, allowing the guide member 43 to be inserted into the locking hole on the wheel axle 22 like a pin. It can be understood that the above structure forms a seesaw-like structure. After the telescopic rod 31 retracts, it pushes the driven member 44 downwards, and the guide member 43 moves upwards, causing the guide member 43 to disengage from the wheel axle 22. After the telescopic rod 31 extends, the driven member 44 returns to its original position upwards, and the guide member 43 moves downwards, causing the guide member 43 to contact and lock the wheel axle 22. It is worth noting that in this embodiment, the part of the telescopic rod 31 that contacts the driven member 44 needs to be specially designed to achieve the function of a rocker, such as by using opposing wedge-shaped inclined surfaces.

[0052] In some embodiments, see Figure 5 and Figure 6 The telescopic rod 31 extends and retracts between a first limit position and a second limit position. When the telescopic rod 31 extends to the first limit position, it disengages from the driven member 44, and the directional member 43 remains in the locked position under the action of the reset element 47. When the telescopic rod 31 retracts to the second limit position, it pushes the driven member 44, causing the switching component 4 to rotate until the directional member 43 is in the released position. It can be understood that the telescopic rod 31 is typically designed with two limit positions. In this application, the first limit position is located at the end of the travel when the telescopic rod 31 is fully extended, and the second limit position is the end of the travel when the telescopic rod 31 is fully retracted. It is understood that the first limit position is not necessarily the position at the instant the telescopic rod 31 disengages from the driven member 44. When the telescopic rod 31 serves as the bottom telescopic structure of a suitcase, it has already disengaged from the driven member 44 before moving to the first limit position; that is, the driven member 44 is already in a free state before the telescopic rod 31 moves to the first limit position. This application utilizes the coordinated action of the travel control of the telescopic rod 31 and the reset element 47 to achieve the maintenance and release of the locking state entirely through mechanical linkage, without the need for manual intervention. For example, in the electric luggage compartment riding state, the telescopic rod 31 extends with the front upright 5 and automatically triggers the lock, preventing loss of directional control due to accidental contact during riding; in the storage state, the telescopic rod 31 retracts and automatically unlocks, eliminating wheel axle wear caused by forgetting to operate in traditional mechanisms.

[0053] In some embodiments, see Figure 2 The reset element 47 is a torsion spring mounted on the switching assembly 4. One end of the torsion spring engages with the switching assembly 4, and the other end engages with the mounting bracket 1. When the telescopic rod 31 extends to its first limit position, the torsion spring applies a force to the directional member 43, thereby locking the directional member 43 onto the wheel axle 22. Preferably, the swing arm 45 has a receiving space at the hinge shaft. The torsion spring is fitted onto the hinge shaft and located within the receiving space. The reset function is achieved by utilizing the circumferential torque characteristic of the torsion spring. After the telescopic rod 31 extends and the switching assembly 4 rotates to the locked position, the elastic potential energy stored in the torsion spring due to its torsional deformation continuously applies a rebound torque to the switching assembly. This torque is converted into a continuous and stable pressing or holding force of the directional member 43 on the wheel axle 22. This ensures a very stable locking state, effectively resisting vibrations and impacts generated during wheel operation, preventing the directional member 43 from accidentally dislodging due to vibration, and greatly enhancing the reliability of the locking.

[0054] In a preferred embodiment, the directional member 43 is a limiting post, and the axle 22 has a limiting hole for the limiting post to be inserted. When the directional member 43 is in the locked position, the limiting post is inserted into the limiting hole. To further ensure alignment accuracy, the first working end 41 of the switching component 4 is provided with a mounting groove, in which a pin 48 is provided. The limiting post is rotatably connected to the pin 48 through a bushing 49. The rotatable setting of the limiting post makes it no longer a rigid fixed component, but a floating component with a small amount of play. Under the action of the torsion spring, the limiting post is pressed against the axle 22, and the limiting post can rotate slightly around the pin 48. During the process of the limiting post being inserted into the limiting hole, if there are small manufacturing tolerances, assembly errors, or deformation of the axle due to force, the rigid structure may cause the limiting post to hit the outer wall of the axle 22 and fail to be inserted smoothly. This floating design allows the limiting post to adaptively adjust its angle to accommodate any alignment deviations that may occur when the switching component 4 rotates, so that its axis automatically aligns with the axis of the limiting hole, thereby greatly improving the success rate and smoothness of insertion.

[0055] In an embodiment where the axis of the first hinge shaft 46 is parallel to the axis of the wheel axle 22, see [reference]. Figure 4 The omnidirectional wheel assembly 2 also includes a wheel frame 23, on which a sleeve 231 is formed for the axle 22 to pass through. The axle 22 is rotatably disposed within the sleeve 231. The sleeve 231 has a clearance hole 232 communicating with a limiting hole. The limiting post passes through the clearance hole 232 and is inserted into the limiting hole. A guide protrusion 233 protruding towards the switching assembly 4 is provided on the outer periphery of the clearance hole 232. The guide protrusion 233 has a positioning curved surface that fits against the outer peripheral surface of the bushing 49. That is, the guide protrusion 233 restricts the movement trajectory of the bushing 49 through physical boundaries, preventing the limiting post from radially offset when inserted into the limiting hole. In a more preferred embodiment, when the omnidirectional wheel 21 is in the released state, the directional member 43 (i.e., the limiting post) is always located in the clearance hole 232, but disengaged from the limiting hole, allowing the axle 22 to rotate freely. This structural design ensures that when the caster wheel 21 needs to be locked, there is no need to reposition it, and the limiting pin can be accurately inserted into the limiting hole.

[0056] In some embodiments, the driven member 44 is a lever located at the second actuating end 42, with the axis of the lever parallel to the axis of the wheel axle 22; the lever is located at the rear end of the telescopic rod 31 and is separately disposed from the telescopic rod 31. This structural design only requires the driven member 44 to extend into the rear end of the telescopic rod 31 through a slot on the mounting bracket 1 or the telescopic assembly 3, while the switching assembly 4 (swing arm) can be designed above or below the telescopic assembly 3, making the overall structure simpler and allowing for integration of the two without major modifications to the existing telescopic structure of the suitcase.

[0057] See Figure 7 This utility model also provides an electric suitcase, comprising:

[0058] A rideable box;

[0059] As in any of the above, the bottom telescopic and directional universal wheel linkage mechanism, the mounting frame 1 is the frame of the box;

[0060] The front upright 5 is connected to the telescopic rod 31 at its bottom. The front upright 5 is configured such that when the front upright 5 is extended and the box is in the riding state, the directional member 43 switches to the locked position; when the front upright 5 is retracted and the box is in the non-riding state, the directional member 43 switches to the released position.

[0061] Furthermore, there are two universal wheel assemblies 2 and two switching assemblies 4, which are respectively located on both sides of the telescopic rod 31, and the driven parts 44 of the two switching assemblies 4 are linked and cooperate with the telescopic rod 31.

[0062] The electric luggage case of this application adopts all the technical solutions of the linkage mechanism in the above embodiments, and therefore has at least all the beneficial effects brought about by the technical solutions of the above linkage mechanism embodiments, which will not be described in detail here.

[0063] The present invention has been further described above with reference to specific embodiments. However, it should be understood that the specific description herein should not be construed as limiting the substance and scope of the present invention. Various modifications made by those skilled in the art to the above embodiments after reading this specification are all within the scope of protection of the present invention.

Claims

1. A bottom telescopic and directional universal wheel linkage mechanism, characterized in that, include: Mounting rack; A caster wheel assembly is disposed at the bottom of the mounting bracket. The caster wheel assembly includes a caster wheel and axle. The rotation of the caster wheel drives the axle to rotate synchronously. A telescopic assembly is disposed within the mounting frame, the telescopic assembly including a telescopic rod; The switching component is linked to the telescopic rod and the omnidirectional wheel respectively, so that the omnidirectional wheel can switch between a directional state and an omnidirectional state.

2. The bottom telescopic and directional universal wheel linkage mechanism according to claim 1, characterized in that, One end of the switching component is provided with a directional element for locking the rotation of the wheel axle.

3. The bottom telescopic and directional universal wheel linkage mechanism according to claim 2, characterized in that, The other end of the switching component is provided with a driven member located behind the telescopic rod.

4. The bottom telescopic and directional omnidirectional wheel linkage mechanism according to claim 3, characterized in that, The switching assembly is hinged to the mounting bracket. The switching assembly includes a first working end and a second working end arranged opposite to each other. The directional member is disposed at the first working end, and the driven member is disposed at the second working end. The telescopic movement of the telescopic rod is linked by the driven member to rotate the switching assembly around its hinge axis, so that the directional member switches between a locked position and a released position. When the directional component is in the locked position, it engages with the axle to restrict the rotation of the axle, thus oriented the omnidirectional wheel; when the directional component is in the released position, it separates from the axle, allowing the axle to rotate freely and oriented the omnidirectional wheel.

5. The bottom telescopic and directional omnidirectional wheel linkage mechanism according to claim 4, characterized in that, The switching assembly includes a swing arm, the middle part of which is hinged to the mounting bracket via a first hinge shaft; The driven member is disposed at one end of the swing arm, the directional member is disposed at the other end of the swing arm, and the axis of the first hinge shaft is parallel to the axis of the wheel axle.

6. The bottom telescopic and directional omnidirectional wheel linkage mechanism according to claim 4, characterized in that, The telescopic rod extends and retracts between a first extreme position and a second extreme position; When the telescopic rod extends to the first limit position, the telescopic rod separates from the driven member, and the directional member remains in the locked position under the action of the reset element; When the telescopic rod retracts to the second limit position, the telescopic rod acts on the driven member, causing the switching component to rotate until the directional member is in the release position.

7. The bottom telescopic and directional omnidirectional wheel linkage mechanism according to claim 6, characterized in that, The reset element is a torsion spring disposed on the switching assembly. After the telescopic rod separates from the driven member, the torsion spring applies a force to the directional member so that the directional member locks the axle.

8. The bottom telescopic and directional universal wheel linkage mechanism according to claim 2, characterized in that, The directional component is a limiting post, and the wheel axle has a limiting hole for the limiting post to be inserted. When the directional component is in the locked position, the limiting post is inserted into the limiting hole.

9. The bottom telescopic and directional omnidirectional wheel linkage mechanism according to claim 8, characterized in that, The first working end of the switching component is provided with a mounting groove, and a pin is provided in the mounting groove. The limiting post is rotatably connected to the pin through a bushing.

10. The bottom telescopic and directional omnidirectional wheel linkage mechanism according to claim 9, characterized in that, The omnidirectional wheel assembly also includes a wheel frame, on which a sleeve is formed for the wheel axle to pass through. The wheel axle is rotatably disposed in the sleeve. The sleeve has a clearance hole communicating with the limiting hole. The limiting post passes through the clearance hole and is inserted into the limiting hole.

11. The bottom telescopic and directional universal wheel linkage mechanism according to claim 10, characterized in that, The outer periphery of the clearance hole is provided with a guide protrusion that protrudes towards the switching component, and the guide protrusion has a positioning curved surface that fits against the outer peripheral surface of the bushing.

12. The bottom telescopic and directional omnidirectional wheel linkage mechanism according to any one of claims 3-7, characterized in that, The driven component is a lever disposed at one end of the switching assembly, the axis of the lever being parallel to the axis of the wheel axle; the lever is located at the rear end of the telescopic rod and is disposed separately from the telescopic rod.

13. An electric suitcase, characterized in that, include: A rideable box; The bottom telescopic and directional caster wheel linkage mechanism as described in any one of claims 1 to 12, wherein the mounting frame is the frame of the housing; The front upright, whose bottom is connected to the telescopic rod, is configured such that: when the front upright is extended and the box is in a riding state, the omnidirectional wheels switch to a directional state; when the front upright is retracted and the box is in a non-riding state, the omnidirectional wheels switch to an omnidirectional state.

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