A universal wheel for luggage and luggage

Abstract

The present application belongs to the technical field of luggage, and particularly relates to a universal wheel for luggage and the luggage. The universal wheel comprises: a swing support provided with a first rotating shaft parallel to a first direction; a second rotating shaft arranged to rotate relative to the swing support along a horizontal direction; a roller installed on the second rotating shaft; a rotary damper installed on the swing support; a clutch mechanism arranged between a damping output end of the rotary damper and the roller or the second rotating shaft; a counterweight part arranged to rotate relative to the swing support; and a transmission mechanism arranged between the counterweight part and the clutch mechanism. The present application ingeniously utilizes the swing of the counterweight caused by the change of the posture of the luggage when going downhill, automatically connects the roller and the damper by integrating the clutch mechanism and the rotary damper triggered by the counterweight part in the universal wheel, converts the gravitational potential energy into controllable damping dissipation, and thus solves the problem of downhill sliding from the root. Meanwhile, the low-resistance dragging convenience on flat ground or uphill is ensured.

Description

Technical Field

[0001] This invention belongs to the field of luggage technology, specifically relating to a universal wheel for luggage and luggage and luggage. Background Technology

[0002] In existing luggage products, casters are typically installed at the bottom of the luggage for easy movement. While this design greatly improves the convenience of dragging on flat ground, it presents significant safety hazards and usability defects in sloping scenarios, especially on long or steep downhill sections. Specifically, when a user drags a luggage downhill, the luggage gains considerable potential energy due to gravity, which easily converts into downward acceleration. At this time, the user must continuously apply a large counter-traction force to prevent the luggage from sliding down rapidly, which not only makes dragging difficult and control challenging, but also easily causes arm fatigue. If the luggage accidentally slips out of the user's hand or becomes uncontrollable, it will slide rapidly downhill under the influence of gravity, which could potentially collide with pedestrians, obstacles, or detach from the road surface, posing a serious threat to the safety of people and property in the surrounding area. Therefore, the problems of insufficient anti-slip capability, poor handling stability, and prominent safety hazards of existing wheeled luggage on downhill conditions urgently need to be solved through structural or mechanistic improvements. Summary of the Invention

[0003] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide a universal wheel for bags and bags that can generate sliding resistance on downhill sections, reduce the burden on users when dragging the bags, and improve safety.

[0004] To achieve the above and other related objectives, the present invention provides a universal wheel for bags, comprising: A swing bracket, wherein the swing bracket is provided with a first rotating shaft parallel to a first direction, and the first rotating shaft is used to rotatably connect to the universal wheel base provided on the bag; The second rotating shaft is rotatably arranged relative to the swing bracket in the horizontal direction, and the axis of the second rotating shaft is perpendicular to the axis of the first rotating shaft; the projection of the first rotating shaft on the ground in the first direction is located on one side of the projection of the second rotating shaft on the ground in the first direction, which is the front side of the caster wheel when it travels along the ground; A roller is mounted on the second rotating shaft; A rotational damper is mounted on the swing bracket; A clutch mechanism is provided between the damping output end of the rotary damper and the roller, or between the damping output end of the rotary damper and the second rotating shaft. The clutch mechanism is configured to switch between an engaged state in which the roller transmits power to the damping output end and an unengaged state in which the roller rotates independently relative to the damping output end. The counterweight is rotatably disposed relative to the swing bracket, and the axis of rotation is parallel to the axis of the second rotating shaft. The center of gravity of the counterweight is located below its axis of rotation. When the caster wheel is on a horizontal ground, the counterweight is located in a first relative position relative to the swing bracket. A transmission mechanism is disposed between the counterweight and the clutch mechanism. The transmission mechanism is configured such that when the counterweight is in the first relative position, the transmission mechanism keeps the clutch mechanism in the disengaged state; when the counterweight swings from the first relative position toward the front of the caster wheel, the transmission mechanism drives the clutch mechanism to switch from the disengaged state to the engaged state.

[0005] In an optional embodiment of the present invention, the clutch mechanism includes a driving disc, a driven disc, and a ball bearing. The driving disc is coaxially fixed to the roller or the second rotating shaft. The damping output end has a cylindrical structure and is coaxially loosely fitted onto the second rotating shaft. The driven disc is coaxially fixed to the damping output end. The driven disc has a through hole, and the driving disc has a groove on one side facing the driven disc. The ball bearing is disposed in the through hole and can move axially along the through hole. In response to the engaged state, a portion of the ball bearing is embedded in the groove. In response to the disengaged state, the ball bearing separates from the groove.

[0006] In an optional embodiment of the present invention, the rotation axis of the counterweight is coaxial with the axis of the second rotating shaft; the transmission mechanism includes a drive disk and a floating disk, the drive disk is fixedly connected to the counterweight, the floating disk is movably arranged along the axial direction of the second rotating shaft, the floating disk is located on the side of the driven disk away from the driving disk, the ball protrudes from the through hole on the side facing the floating disk and rolls against the floating disk; a transmission unit is provided between the drive disk and the floating disk, the transmission unit is configured to drive the floating disk to slide closer to the driven disk when the counterweight swings from the first relative position to the front of the universal wheel.

[0007] In an optional embodiment of the present invention, the transmission unit includes an arc-shaped wedge block disposed on one side of the floating disk facing the drive disk, the center of the arc of the arc-shaped wedge block being located on the extension line of the axis of the drive disk, the arc-shaped wedge block having a planar top surface facing the drive disk, and a wedge surface that is smoothly inclined from one end of the top surface to the surface of the floating disk along the circumference of the floating disk, the drive disk having a wedge groove on one side facing the floating disk that matches the contour of the arc-shaped wedge block, and when the counterweight is located in the first relative position, the arc-shaped wedge block is embedded in the wedge groove.

[0008] In an optional embodiment of the present invention, a circumferential limiting structure for preventing the floating disk from rotating is provided between the floating disk and the swing bracket.

[0009] In an optional embodiment of the present invention, the swing bracket or the floating disk is provided with a limiting part for preventing the counterweight from swinging from the first relative position toward the rear side of the caster wheel, wherein the rear side is the side opposite to the front side.

[0010] In an optional embodiment of the present invention, the swing bracket is provided with a hinge support, the hinge support is provided with a shaft hole, the clutch mechanism, the counterweight and the transmission mechanism are provided on one side of the hinge support, the rotation damper is provided on the other side of the hinge support, and the second rotating shaft and the damping output end pass through the shaft hole.

[0011] In an optional embodiment of the present invention, the hinge support is provided with dustproof flanges on both sides, respectively surrounding the clutch mechanism and the rotary damper.

[0012] In an optional embodiment of the present invention, two rollers are provided, and the two rollers are respectively fixed to both ends of the second rotating shaft, and the two rollers are respectively located on both sides of the hinge support.

[0013] To achieve the above and other related objectives, the present invention also provides a bag, comprising: The bag body, the bottom of which is provided with multiple caster wheel bases; and The plurality of the aforementioned casters for bags, wherein the first pivot of each caster is rotatably connected to the base of each caster.

[0014] The technical advantages of this invention are as follows: By integrating a clutch mechanism triggered by a counterweight and a rotational damper into the universal wheel, this invention cleverly utilizes the counterweight swing caused by the change in the box's posture when going downhill, automatically connecting the rollers and the damper, so that gravitational potential energy is converted into controllable damping dissipation, thereby fundamentally solving the problem of slipping downhill; it significantly reduces the continuous braking force required by the user, avoiding arm fatigue and difficulty in operation, and can also suppress the accelerated slippage of the box through the damping effect when it is accidentally released, effectively eliminating the safety risks caused by high-speed loss of control, while ensuring low-resistance dragging convenience when the damper is disengaged and the universal wheel rotates freely on flat ground or uphill. Attached Figure Description

[0015] Figure 1 This is a perspective view of the bag provided in an embodiment of the present invention; Figure 2 This is a perspective view of the universal wheel provided in an embodiment of the present invention; Figure 3This is an exploded view of one perspective of the omnidirectional wheel provided in an embodiment of the present invention; Figure 4 This is an exploded view of the omnidirectional wheel provided in an embodiment of the present invention; Figure 5 This is a side view of the universal wheel provided in an embodiment of the present invention; Figure 6 This is a cross-sectional view of the omnidirectional wheel provided in an embodiment of the present invention on a horizontal ground, and the sectioning position is as follows. Figure 5 As shown in AA; Figure 7 yes Figure 6 BB section view; Figure 8 This is a cross-sectional view of the omnidirectional wheel provided in an embodiment of the present invention on a downhill surface, and the sectioning position is as follows. Figure 5 As shown in AA; Figure 9 yes Figure 8 CC section view; Figure 10 This is a cross-sectional view of the omnidirectional wheel provided in an embodiment of the present invention on an uphill surface, with the cut position being the same as... Figure 7 The cutting positions are the same; Explanation of reference numerals in the attached drawings: 100, caster wheel; 10, swing bracket; 11, first pivot; 12, second pivot; 13, hinge support; 14, shaft hole; 15, dustproof flange; 20, roller; 30, driving disc; 31, groove; 40, driven disc; 41, ball bearing; 50, rotary damper; 51, damping output end; 60, counterweight; 70, drive disc; 71, wedge groove; 80, floating disc; 81, arc-shaped wedge block; 811, top surface; 812, wedge surface; 200, luggage body; 210, caster wheel base. Detailed Implementation

[0016] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0017] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the illustrations only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0018] Installing casters on the bottom of luggage greatly improves the convenience of dragging on flat ground. However, wheeled luggage is prone to slipping and losing control when going downhill, posing a safety hazard. Traditional caster systems are essentially passive rolling devices, capable of low-resistance movement by human traction on flat or uphill surfaces. They cannot provide adjustable dynamic damping or effective braking force in gravity-dominated downhill scenarios. Because there is no controllable energy dissipation or locking mechanism between the luggage's center of gravity and the wheel axle, potential energy is directly converted into the acceleration kinetic energy of the wheels. This forces the user to work against gravity throughout the journey. Once traction is insufficient or interrupted, the luggage enters a free acceleration state, leading to decreased maneuverability and safety risks. Therefore, the present invention provides a universal wheel for bags and a bag containing the universal wheel. The universal wheel is equipped with a rotation damper, which is linked to the wheel axle of the universal wheel through a clutch mechanism. The universal wheel also has a counterweight inside, which can trigger the clutch mechanism to open and close. When the bag is walking on a level surface or an uphill surface, the clutch mechanism is disengaged, and the universal wheel can rotate freely without being constrained by the rotation damper, reducing dragging resistance. When the bag is walking on a downhill surface, the counterweight can trigger the clutch mechanism to close, and the rotation damper can provide walking resistance to the universal wheel, thereby reducing the burden on the user when dragging the bag downhill and preventing the bag from slipping downhill due to accidental loss of control, thus avoiding safety hazards.

[0019] The technical solution of the present invention will be described in detail below with reference to specific embodiments: Please see Figure 1 As shown, an embodiment of the present invention provides a bag with casters 100. The bag includes a bag body 200 and a plurality of casters 100. The bottom of the bag body 200 is provided with a plurality of caster bases 210. Each caster 100 is rotatably connected to each caster base 210.

[0020] Please see Figure 2-10As shown, the caster wheel 100 includes a swing bracket 10, a first rotating shaft 11, a second rotating shaft 12, a roller 20, a rotation damper 50, a clutch mechanism, a counterweight 60, and a transmission mechanism. The swing bracket 10 is provided with a first rotating shaft 11 parallel to a first direction. In a specific embodiment, the first direction can be a direction perpendicular to the ground. The first rotating shaft 11 is used to rotatably connect to the caster wheel base 210 provided on the bag. The second rotating shaft 12 is rotatably arranged relative to the swing bracket 10 in a horizontal direction. The axis of the second rotating shaft 12 is perpendicular to the axis of the first rotating shaft 11. The projection of the first rotating shaft 11 on the ground along the first direction is located on one side of the projection of the second rotating shaft 12 on the ground along the first direction. This side is the front side of the caster wheel 100 when it travels along the ground. The roller 20 is mounted on the second rotating shaft 12. It should be understood that when dragging a bag, the dragging force is transmitted to the caster wheel 100 through the first pivot 11. Therefore, no matter which direction the bag is dragged, the first pivot 11 of the caster wheel 100 is always located in front of the direction of movement of the caster wheel 100.

[0021] Please see Figure 3 , 4 As shown in Figures 6 and 8, the rotary damper 50 is mounted on the swing bracket 10; a clutch mechanism is disposed between the damping output end 51 of the rotary damper 50 and the roller 20, or between the damping output end 51 of the rotary damper 50 and the second rotating shaft 12. The clutch mechanism is configured to switch between an engaged state in which the roller 20 transmits power to the damping output end 51, and an unengaged state in which the roller 20 rotates independently relative to the damping output end 51; the counterweight 60 is rotatably disposed relative to the swing bracket 10, and its rotation axis is parallel to the axis of the second rotating shaft 12. The lines are parallel, and the center of gravity of the counterweight 60 is located below its rotation axis. When the caster wheel 100 is on a horizontal ground, the counterweight 60 is in a first relative position relative to the swing bracket 10. A transmission mechanism is disposed between the counterweight 60 and the clutch mechanism. The transmission mechanism is configured such that when the counterweight 60 is in the first relative position, the transmission mechanism keeps the clutch mechanism in the disengaged state; when the counterweight 60 swings from the first relative position toward the front of the caster wheel 100, the transmission mechanism drives the clutch mechanism to switch from the disengaged state to the engaged state.

[0022] In specific embodiments, each caster wheel 100 can be equipped with two rollers 20. When two rollers 20 are provided, in order to load the rotational damper 50 on both rollers 20 simultaneously, the two rollers 20 can be fixedly connected to the second rotating shaft 12. In this case, it is only necessary to set the clutch mechanism between one of the rollers 20 and the damping output end 51, or between the second rotating shaft 12 and the damping output end 51. In other embodiments, in order to ensure the steering flexibility of the caster wheel 100, the two rollers 20 can rotate independently relative to the second rotating shaft 12. In this case, if space permits, two sets of the above-mentioned clutch mechanisms can be symmetrically arranged. Each set of clutch mechanisms realizes the engagement and disengagement between one roller 20 and the damping output end 51. Correspondingly, an independent transmission mechanism needs to be set for each set of clutch mechanisms. In some embodiments, each caster wheel 100 can be equipped with only one roller 20. In this case, the roller 20 needs to be positioned aligned with the first rotating shaft 11 in the front-back direction.

[0023] This invention cleverly utilizes the counterweight swing caused by the change in the box's posture when going downhill by integrating a clutch mechanism triggered by the counterweight 60 into the universal wheel 100. This automatically connects the roller 20 to the damper, converting gravitational potential energy into controllable damping dissipation, thus fundamentally solving the problem of slipping downhill. It significantly reduces the continuous braking force required by the user, avoiding arm fatigue and difficulty in operation. In the event of accidental slippage, the damping effect can suppress the accelerated slippage of the box, effectively eliminating the safety risks caused by high-speed loss of control. At the same time, it ensures low-resistance dragging convenience when the damper is disengaged and the universal wheel 100 rotates freely on flat ground or uphill.

[0024] Please see Figure 6 , 8As shown, in an optional embodiment of the present invention, the clutch mechanism includes a driving disc 30, a driven disc 40, and a ball bearing 41. The driving disc 30 is coaxially fixed to the roller 20 or the second rotating shaft 12. The damping output end 51 has a cylindrical structure and is coaxially loosely fitted onto the second rotating shaft 12. The driven disc 40 is coaxially fixed to the damping output end 51. The driven disc 40 has a through hole, and the driving disc 30 has a groove 31 on one side facing the driven disc 40. The ball bearing 41 is disposed in the through hole and can move axially along the through hole. In response to the engaged state, a portion of the ball bearing 41 is embedded in the groove 31. In response to the disengaged state, the ball bearing 41 separates from the groove 31. This clutch mechanism, through the movable design of the ball bearing 41 within the through hole, enables rapid and reliable engagement and disengagement between the driven disc 40 and the driving disc 30. When the counterweight 60 swings due to its downhill posture and triggers the transmission mechanism, it can precisely push the ball bearing 41 axially into the groove 31 of the driving disc 30 with a small force, instantly locking the power transmission path. This allows the damper to immediately intervene and suppress the acceleration of the roller 20, thereby efficiently converting the kinetic energy of the bag's downward movement into controllable heat dissipation. On flat ground or uphill, the counterweight 60 resets, the ball bearing 41 disengages from the groove 31, the power transmission path is cut off, ensuring that the roller 20 rotates freely with almost no additional resistance. This ball bearing 41 clutch mechanism is responsive and stable, achieving adaptive switching between instant engagement and disengagement between the damper and the wheel axle with a simple structure. This fundamentally ensures that the bag automatically prevents slipping and is safe and controllable when going downhill, and is light and smooth on flat ground.

[0025] Please see Figure 3 , 4As shown in Figures 6-9, in an optional embodiment of the present invention, the rotation axis of the counterweight 60 is coaxial with the axis of the second rotating shaft 12; the transmission mechanism includes a drive disk 70 and a floating disk 80, the drive disk 70 is fixedly connected to the counterweight 60, the floating disk 80 is movably arranged along the axial direction of the second rotating shaft 12, the floating disk 80 is located on the side of the driven disk 40 away from the driving disk 30, the ball bearing 41 protrudes from the through hole on the side facing the floating disk 80 and rolls against the floating disk 80; a transmission unit is provided between the drive disk 70 and the floating disk 80, the transmission unit is configured to drive the floating disk 80 to slide closer to the driven disk 40 when the counterweight 60 swings from the first relative position toward the front of the universal wheel 100. This embodiment constructs a stable and reliable automatic triggering and holding system by linking the counterweight 60, drive disc 70, floating disc 80, and ball bearing 41 clutch mechanism. When the bag goes downhill, causing the counterweight 60 to swing forward, it directly pushes the floating disc 80 axially to press all the balls 41 through the transmission unit, forcing the balls 41 to simultaneously embed into the groove 31 of the drive disc 30, instantly completing the engagement of the clutch mechanism. At this time, the rotary damper 50 immediately generates resistance to the roller 20 to counteract the acceleration due to gravity. More importantly, once engaged, the driven disc 40, which rotates synchronously with the wheel axle, will drive the balls 41 to roll circumferentially on the surface of the floating disc 80, which is kept in a pressed state. This design allows the floating disc 80 to continuously provide axial thrust towards the drive disc 30, always locking the balls 41 in the groove 31 during dynamic rotation, effectively preventing accidental disengagement due to vibration or uneven force, ensuring the continuity and reliability of damping braking throughout the downhill process, thereby fundamentally realizing the automatic triggering and stable maintenance of the anti-slip function, greatly improving safety.

[0026] Please see Figure 3 , 4As shown in Figures 6-9, in an optional embodiment of the present invention, the transmission unit includes an arc-shaped wedge 81 disposed on the side of the floating disk 80 facing the drive disk 70. The arc center of the arc-shaped wedge 81 is located on the extension line of the axis of the drive disk 70. The arc-shaped wedge 81 has a planar top surface 811 facing the drive disk 70, and a wedge surface 812 that is smoothly inclined from one end of the top surface 811 to the surface of the floating disk 80 along the circumference of the floating disk 80. The drive disk 70 has a wedge groove 71 on the side facing the floating disk 80 that matches the contour of the arc-shaped wedge 81. When the counterweight 60 is located in the first relative position, the arc-shaped wedge 81 is embedded in the wedge groove 71. The transmission unit, through the cooperation of the arc-shaped wedge block 81 and the wedge groove 71, precisely converts the downhill swing of the counterweight 60 into the smooth axial pressing motion of the floating disc 80, ensuring the reliability of the clutch engagement action. In particular, when the floating disc 80 presses the ball 41, the planar top surface 811 of the arc-shaped wedge block 81 forms a stable planar contact with the drive disc 70. This design plays a crucial self-locking role. It can withstand the axial force transmitted in the opposite direction by the ball 41, and prevent the reaction force from generating a component force along the wedge surface 812 that would cause the counterweight 60 to swing back. Thus, during the dynamic downhill process, the possibility of the clutch mechanism accidentally disengaging due to force vibration is completely eliminated, ensuring the continuous and reliable output of damping braking force. This allows the entire anti-slip mechanism to enter a firm holding state after automatic triggering, significantly improving the robustness and safety of the system.

[0027] Please see Figure 3 , 4 As shown, in an optional embodiment of the present invention, a circumferential limiting structure for preventing the floating disk 80 from rotating is provided between the floating disk 80 and the swing bracket 10. In a specific embodiment, the circumferential limiting structure may be, for example, a key and a keyway that cooperate with each other. This circumferential limiting structure prevents unnecessary circumferential rotation of the floating disk 80, ensuring precise motion transmission of the wedge transmission mechanism driven by the swing of the counterweight 60. Specifically, it keeps the floating disk 80 and the swing bracket 10 in a fixed relative position in the circumferential direction, thereby ensuring a strict radial alignment between the wedge groove 71 on the drive disk 70 and the arc-shaped wedge block 81 on the floating disk 80. This not only allows the swing of the counterweight 60 to be converted into the axial linear motion required to push the ball 41 without deviation and efficiently, avoiding transmission jamming or failure caused by the deflection of the floating disk 80, but more importantly, it maintains a stable surface contact state between the planar top surface 811 of the arc-shaped wedge block 81 and the drive disk 70 after the clutch mechanism is engaged, providing solid reaction force support for the transmission unit and serving as the basic structural guarantee for the reliable operation of the entire automatic triggering and self-locking mechanism.

[0028] Please see Figure 7 , 10 In an optional embodiment of the present invention, the swing bracket 10 or the floating disk 80 is provided with a limiting part to prevent the counterweight 60 from swinging from the first relative position toward the rear side of the caster wheel 100, where the rear side is the side opposite to the front side. In a specific embodiment, the limiting part may be formed, for example, by a portion of the dustproof flange 15 in a later embodiment. This limiting part, through physical obstruction, precisely limits the swing range of the counterweight 60 to a single-sided range swinging forward from the vertically downward position, thereby effectively solving the problem of the counterweight 60 swinging backward due to inertia or the bag in complex postures such as uphill or bumpy conditions. It prevents the counterweight 60 from mistakenly locking the clutch mechanism in the engaged state due to backward swinging, ensuring that the system reliably triggers the clutch mechanism engagement only in a true downhill posture. This design eliminates the malfunction of the clutch mechanism at its source, greatly improving the accuracy and reliability of the entire adaptive damping system, and ensuring that the bag always has a light dragging experience in most non-downhill road conditions.

[0029] Please see Figure 3 , 4 As shown in Figures 6 and 8, in an optional embodiment of the present invention, the swing bracket 10 is provided with a hinge support 13, the hinge support 13 is provided with a shaft hole 14, the clutch mechanism, the counterweight 60 and the transmission mechanism are disposed on one side of the hinge support 13, the rotary damper 50 is disposed on the other side of the hinge support 13, and the second rotating shaft 12 and the damping output end 51 pass through the shaft hole 14. Dustproof flanges 15 are provided on both sides of the hinge support 13, respectively surrounding the clutch mechanism and the rotary damper 50. In an optional embodiment of the present invention, two rollers 20 are provided, the two rollers 20 are respectively fixed to both ends of the second rotating shaft 12, and the two rollers 20 are respectively located on both sides of the hinge support 13. This structural layout achieves compact integration and physical separation of core functional modules by placing the rotary damper 50 and the clutch transmission mechanism on both sides of the hinge support 13. This not only optimizes space utilization but also ensures precise alignment of the power transmission path and structural rigidity through the second rotating shaft 12 through the shaft hole 14 and the damping output end 51. The dustproof flanges 15 on both sides effectively isolate external contaminants such as dust from intruding on the internal precision clutch components and damper, significantly improving the long-term reliability of the entire system in complex operating environments. The design of the double rollers 20 symmetrically distributed on both sides of the hinge support 13 further enhances the load-bearing stability and smooth movement of the caster wheel 100.

[0030] In summary, this invention cleverly utilizes the counterweight swing caused by the change in the box's posture when going downhill by integrating a clutch mechanism triggered by the counterweight 60 into the universal wheel 100. This automatically connects the roller 20 to the damper, converting gravitational potential energy into controllable damping dissipation, thus fundamentally solving the problem of slipping downhill. It significantly reduces the continuous braking force required by the user, avoiding arm fatigue and difficulty in operation. In the event of accidental slippage, the damping effect can suppress the accelerated slippage of the box, effectively eliminating the safety risks caused by high-speed loss of control. At the same time, it ensures low-resistance dragging convenience when the damper is disengaged and the universal wheel 100 rotates freely on flat ground or uphill.

[0031] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

[0032] Throughout this description, numerous specific details, such as examples of components and / or methods, are provided to provide a complete understanding of embodiments of the invention. However, those skilled in the art will recognize that embodiments of the invention may be practiced without one or more of these specific details or by other devices, systems, components, methods, parts, materials, components, etc. In other instances, well-known structures, materials, or operations have not been specifically shown or described in detail to avoid obscuring aspects of embodiments of the invention.

Claims

1. A universal wheel for bags, characterized in that, include: A swing bracket (10) is provided with a first rotating shaft (11) parallel to the first direction. The first rotating shaft (11) is used to rotatably connect to the universal wheel base (210) provided on the bag. The second rotating shaft (12) is rotatably arranged relative to the swing bracket (10) in the horizontal direction. The axis of the second rotating shaft (12) is perpendicular to the axis of the first rotating shaft (11). The projection of the first rotating shaft (11) on the ground in the first direction is located on one side of the projection of the second rotating shaft (12) on the ground in the first direction. This side is the front side of the universal wheel when it travels along the ground. Roller (20) is mounted on the second rotating shaft (12); A rotational damper (50) is mounted on the swing bracket (10); A clutch mechanism is provided between the damping output end (51) of the rotary damper (50) and the roller (20), or between the damping output end (51) of the rotary damper (50) and the second rotating shaft (12). The clutch mechanism is configured to switch between an engaged state in which the roller (20) transmits power to the damping output end (51) and an unengaged state in which the roller (20) rotates independently relative to the damping output end (51). The counterweight (60) is rotatably disposed relative to the swing bracket (10), and the axis of rotation is parallel to the axis of the second rotating shaft (12). The center of gravity of the counterweight (60) is located below its axis of rotation. When the caster is on a horizontal ground, the counterweight (60) is located in a first relative position relative to the swing bracket (10). A transmission mechanism is disposed between the counterweight (60) and the clutch mechanism. The transmission mechanism is configured such that when the counterweight (60) is in the first relative position, the transmission mechanism keeps the clutch mechanism in the disengaged state, and when the counterweight (60) swings from the first relative position toward the front of the caster wheel, the transmission mechanism drives the clutch mechanism to switch from the disengaged state to the engaged state. The clutch mechanism includes a driving disc (30), a driven disc (40), and a ball (41). The driving disc (30) is coaxially fixed with the roller (20) or the second rotating shaft (12). The damping output end (51) is a cylindrical structure and is coaxially loosely fitted on the second rotating shaft (12). The driven disc (40) is coaxially fixed with the damping output end (51). The driven disc (40) has a through hole. The driving disc (30) has a groove (31) on one side facing the driven disc (40). The ball (41) is disposed in the through hole and can move along the axial direction of the through hole. In response to the engaged state, a portion of the ball (41) is embedded in the groove (31). In response to the disengaged state, the ball (41) separates from the groove (31). The rotation axis of the counterweight (60) is coaxial with the axis of the second rotating shaft (12); the transmission mechanism includes a drive disk (70) and a floating disk (80). The drive disk (70) is fixedly connected to the counterweight (60). The floating disk (80) is movably arranged along the axis of the second rotating shaft (12). The floating disk (80) is located on the side of the driven disk (40) away from the driving disk (30). The ball (41) protrudes from the through hole on the side facing the floating disk (80) and rolls against the floating disk (80). A transmission unit is provided between the drive disk (70) and the floating disk (80). The transmission unit is configured to drive the floating disk (80) to slide closer to the driven disk (40) when the counterweight (60) swings from the first relative position toward the front of the universal wheel.

2. The universal wheel for bags according to claim 1, characterized in that, The transmission unit includes an arc-shaped wedge (81) disposed on one side of the floating disk (80) facing the drive disk (70). The center of the arc of the arc-shaped wedge (81) is located on the extension line of the axis of the drive disk (70). The arc-shaped wedge (81) has a planar top surface (811) facing the drive disk (70) and a wedge surface (812) that is smoothly inclined from one end of the top surface (811) to the surface of the floating disk (80) along the circumference of the floating disk (80). The drive disk (70) has a wedge groove (71) on one side facing the floating disk (80) that matches the contour of the arc-shaped wedge (81). When the counterweight (60) is in the first relative position, the arc-shaped wedge (81) is embedded in the wedge groove (71).

3. The universal wheel for bags according to claim 1, characterized in that, A circumferential limiting structure is provided between the floating disk (80) and the swing bracket (10) to prevent the floating disk (80) from rotating.

4. The universal wheel for bags according to claim 3, characterized in that, The swing bracket (10) or the floating disk (80) is provided with a limiting part for preventing the counterweight (60) from swinging from the first relative position toward the rear side of the caster wheel, the rear side being the side opposite to the front side.

5. The universal wheel for bags according to claim 1, characterized in that, The swing bracket (10) is provided with a hinge support (13), the hinge support (13) is provided with a shaft hole (14), the clutch mechanism, the counterweight (60) and the transmission mechanism are arranged on one side of the hinge support (13), the rotary damper (50) is arranged on the other side of the hinge support (13), and the second rotating shaft (12) and the damping output end (51) pass through the shaft hole (14).

6. The universal wheel for bags according to claim 5, characterized in that, The hinge support (13) has dustproof flanges (15) on both sides, which surround the clutch mechanism and the rotary damper (50) respectively.

7. The universal wheel for bags according to claim 5, characterized in that, There are two rollers (20), which are fixed to both ends of the second rotating shaft (12) respectively, and are located on both sides of the hinge support (13).

8. A type of bag, characterized in that, include: The bag body (200) has multiple caster wheel bases (210) at its bottom. as well as The universal wheels (100) for bags according to any one of claims 1 to 7, wherein the first pivot (11) of each universal wheel (100) is rotatably connected to each universal wheel base (210).

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