Positionable wheels for moving objects

Abstract

The present disclosure relates to an assembly that includes a shiftable part - a three-sided open frame or an independent rod with stub axles. In some embodiments, the shiftable part is designed to "slide" inside an enclosing tube. In other embodiments, the shiftable part is designed to be "adjustable" by attaching it to a pivot. These shiftable parts are used to attach a general wheel or a multi-wheel star assembly. Such an assembly can be attached to or integrated into a movable object - luggage or a robot - to facilitate the movement of the movable object up stairs. When the wheels are positioned to keep the body of the movable object clear of the edge of the stairs, the object can be moved up and down stairs without being damaged. When the wheels are moved to other positions, the object can easily move on flat surfaces. One of these positions is for storing the object in a smaller space.

Description

[Technical field]

[0001] Sometimes it is necessary to carry things, objects, suitcases, etc. up stairs or steps on the ground. Generally, the objects are lifted and carried up stairs or steps. The widely known suitcases - especially trolley cases - have two or more small wheels that can be pulled on a flat surface, but these trolley cases - cannot be pulled up stairs and steps.

[0002] One or similar embodiments of the present invention may be attached to or integrated into a mobile object, such as a suitcase, a container, a bag, a cabinet, a machine, etc. These embodiments may also be integrated into those devices intended to carry other objects, such as trolleys, vehicles, robots, etc.

[0003] The assemblies provided herein are for positioning the wheels relative to the object being moved up the stairs by moving the moving axle or bar that carries the wheels. By using one of these or similar assemblies and utilizing the corresponding method, an object can be moved up or down the stairs. [Background technology]

[0004] Most people don't need to carry reasonably heavy and large objects - like suitcases - up stairs on a regular basis, so most people don't go to great lengths to find solutions for carrying luggage up stairs, and most people don't want to pay for expensive, complicated, and heavy mechanisms for an occasional problem.

[0005] Currently, a typical trolley case has two or more small wheels attached to one of the narrow sides of the trolley case. A typical case with these wheels can be pulled over a flat surface - a paved ground or a floor - by an extendable handle or strap. Very few trolley cases have wheels large enough to overcome small obstacles or carry heavier loads.

[0006] In order to protect the wheels from dirt or dust from the soil in which the trolley cases reside, attempts have been made to develop wheel assemblies that can be stored in dedicated cavities or pockets provided inside these trolley cases. One example of such an attempt is U.S. Pat. No. 5,393,363 which claims a method and apparatus for extending and retracting wheels on a towable case. Another example is U.S. Pat. No. 5,393,363 which claims a retractable wheel system for towable luggage.

[0007] US Patent No. 5,399,633 entitled "Trolley with Retractable Wheel Assembly" claims a retractable wheel assembly for carrying items such as golf bags. The wheels are lifted to keep the retractable or stationary trolley.

[0008] These trolley cases or the trolleys mentioned in the previous paragraph were not designed to be pulled up stairs. Although some trolley cases have large wheels to carry heavy weights and overcome obstacles or climbing steps, these large wheels are not desirable on flat surfaces.

[0009] Some trolley cases have two sets of multi-wheel assemblies instead of normal wheels. These wheel assemblies are typically three-wheel star assemblies, although four-wheel star assemblies are sometimes employed. A three-wheel star assembly consists of three wheels, each located at the end of a radial spoke (arm) of a central hub. Such an assembly makes it easier to pull the trolley case and move it up stairs.

[0010] In other words, a three wheel star assembly has three spoke like arms extending radially from a center or hub. Each arm has a stub axle mounted perpendicularly. All three stub axles are parallel to each other. Every stub axle has a wheel mounted to it. Thus, each three wheel star assembly has a central hub with three wheels mounted thereon. The axes of all three wheels are parallel to the axis of the central hub.

[0011] These three or four wheel star assemblies are also sometimes called spider wheel assemblies. These multi-wheel assemblies make it easier to pull a trolley case up and down stairs compared to simple wheels. However, these multi-wheel assemblies make it difficult to store a trolley case using the multi-wheel assemblies in tight spaces such as under passenger seats or in overhead bins. These multi-wheel assemblies also make it difficult to pull such a trolley case on a flat surface.

[0012] US Patent No. 5,399,633 claims a foldable spider wheel assembly on a towing device that allows storage within a standard rectangular space. The purpose of this foldable wheel assembly is to protect the spider wheel inside the body of the towing device during storage. Unlike the present disclosure, the axles of these spider wheel assemblies remain fixed near the body of the object.

[0013] US Patent No. 6,938,740, entitled "Suitcase with Stair Rollers and Brakes," claims fixed, spaced axles. The challenge with this and other stair climbing designs is the complexity involved. These complex mechanisms built into the luggage or case make the luggage or case expensive and / or heavy.

[0014] Some of the previously patented designs may be easier to operate than some of the embodiments of the present invention. A three-wheel star assembly for a typical suitcase would be easier to operate if it were powered by an electric battery, but would be expensive and heavy. Such an electric three-wheel star assembly is needed in the case of a stair climbing robot. Complex trolleys are not currently required as they are expensive and heavy.

[0015] Some existing assemblies and approaches are simpler in design and easier to operate than most of the embodiments presented herein, but require more space to store objects and / or are not as easy to pass objects through on a flat surface. One example is a simple trolley case with two three-wheel star assemblies. [Prior art documents] [Patent documents]

[0016] [Patent Document 1] U.S. Patent No. 6,612,411 B2 [Patent Document 2] U.S. Patent No. 7,861,834B2 [Patent Document 3] U.S. Patent No. 5,306,027 [Patent Document 4] U.S. Patent No. 7,669,862 B2 [Patent Document 5] U.S. Patent No. 6,938,740 Summary of the Invention [Problem to be solved by the invention]

[0017] Most embodiments of the present disclosure and associated assemblies are designed to provide a fairly simple and / or cost-effective solution for transporting objects up stairs that is an alternative to preventing the edges of the object from rubbing against the edge of a staircase or against a step on a floor when the object is manually lifted.

[0018] Most of the assemblies provided herein are simple enough that they require little maintenance. The methods of operation of the assemblies are also easy. Some embodiments use assemblies that are not very simple, but are easy to operate.

[0019] A unit using any one of these assemblies will behave much like a normal trolley case while moving on a flat surface. Most of the embodiments described herein are designed to be easily integrated into mass-produced objects, such as trolley cases or robots, without adding significant weight and / or cost. [Means for solving the problem]

[0020] Embodiments of the present disclosure have positionable wheel assemblies mounted on rotatable or sliding frames or independent rods that act as axles. These assemblies can be attached to or incorporated into suitcases, robots, containers, and other movable objects to help pull or move these objects up and down stairs after use of a corresponding method or technique.

[0021] Most of the assemblies given in this application are for sliding or moving a frame that acts as an axle. Some of the embodiments are for sliding or moving an independent rod with a stub axle. Thus, the wheels attached to these frames and axles or independent rods with stub axles can be moved further away from the body of the movable object and moved closer to the body of the movable object. Some of the assemblies are for positioning the wheels by rotating the axle around the body of the object. Most of these assemblies can increase the distance between the body or trunk of the movable object and its wheels. This increase in distance or simply shifting the position of the wheels provides enough space for the edge of the step between the body and the wheels. The wheels can be stored or moved to their initial position for easy movement on flat surfaces and / or storage in a smaller space.

[0022] The main member in most embodiments is an open three-sided frame with a middle side that serves as the axle for the wheels. This frame, together with the normal wheels or multi-wheel star assembly, is extendable, i.e., can be pulled out and retracted into an enclosing tube or socket as designed. The enclosing tube is attached or integrated into the body of the moveable object. These assemblies and related methods help to avoid contact between the main body of the moveable object and the edge of the stair step.

[0023] The assemblies and methods provided herein are designed to be simple, easy to use, economical, and lightweight. These assemblies facilitate moving objects up and down stairs.

[0024] The main part of most embodiments is a telescoping, shiftable frame. The term "frame" generally refers to a four-sided closed frame. However, as used herein, the frame is a three-sided or "open" frame, meaning that the fourth side that closes a typical frame is absent as it is not required. This is similar to a three-sided door frame.

[0025] In these open frames, two identical sides are connected by a middle side. The middle side is preferably perpendicular to the two identical sides. The two opposite sides are mirror images of each other and are also parallel to each other. The middle side connects the two identical sides at their corresponding ends. Thus, from an angle, a typical open frame looks like a square U-shape. The middle side may not be simply straight between the ends. The middle side may have a bend or curvature where the wheels are not attached. The two parallel sides attached to the middle side may also not be straight. The two parallel sides may have a bend, curvature, etc. in the exemplary embodiment.

[0026] The two parallel sides slide inside two parallel surrounding (outer) tubes which may be attached to or integrated into a movable object, such as a suitcase, container, box, robot, etc.

[0027] On said intermediate side, two normal wheels or multi-wheel assemblies are mounted and spaced apart, so that said intermediate side acts as an axle. This extendable "open frame" acting as an axle can be visualized as a "shiftable open frame" or a "slidable open frame".

[0028] In most embodiments, the shiftable open frame can be slid relative to the main body of the object. Conventional wheels or multi-wheel star assemblies mounted on the open frame can thus be moved away from or towards the main body of the object. One embodiment has an independently sliding "rod with stub axles". Two conventional wheels or multi-wheel star assemblies are attached to the free end of the rod.

[0029] In one embodiment, the open frame can rotate or move around the object to be moved with conventional wheels or a multi-wheel star assembly. Another embodiment uses independently rotatable rods with stub axles attached to their free ends. Each of these stub axles supports either a simple wheel or a multi-wheel star assembly.

[0030] By sliding or rotating the open frame or "bar with stub axles", a space is created between the main body of the object and the wheels or wheel assemblies. This space accommodates the edges of stair steps, allowing the object to travel up or down stairs without being damaged.

[0031] By moving the wheel or multi-wheel star assembly closer to the object, the open frame can be retracted to store the wheel or multi-wheel star assembly in a relatively small space, such as under a seat in a passenger train or in an overhead bin in an aircraft, which is considered to be a better position for moving the object on a flat surface. [Brief description of the drawings]

[0032] The various embodiments presented herein can be more clearly understood by reading the following brief description of the accompanying drawings, which are for illustrative purposes only and are not limiting of the invention.

[0033] Three simple perspective views are used to quickly communicate the design of the exemplary embodiments. Most of the views are side views, as it is convenient to show details in the side views for the assemblies presented here. Only two views are front views, and the side views are used merely to emphasize something that cannot be clearly explained in a few words. [Figure 1] FIG. 1 is a simplified perspective view showing two wheels 20 mounted on a shiftable open frame 50. [Diagram 2] FIG. 2 is another simplified perspective view similar to FIG. 1 of the exemplary embodiment, but with hidden lines showing the complete shiftable open frame 50, as well as the complete handle frame 90. [Diagram 3] FIG. 2 is yet another simplified perspective view of an exemplary embodiment. [Figure 4] FIG. 1 is a side view of an exemplary embodiment. [Diagram 5] FIG. 2 is a front view of an exemplary embodiment. [Figure 6] FIG. 1 is a side view of an exemplary embodiment. [Figure 7] FIG. 13 is a side view of a variation of the exemplary embodiment. [Figure 8] FIG. 13 is another side view of a variation of the exemplary embodiment. [Figure 9] FIG. 13 is a side view of an alternative embodiment. [Figure 10] FIG. 13 is another side view of the alternative embodiment. [Figure 11] 1 shows another embodiment similar to the exemplary embodiment. [Figure 12] 7 and 8 show another embodiment similar to that shown in FIG. [Figure 13] FIG. 2 is a side view of the preferred embodiment. [Figure 14] FIG. 1 is a front view of a preferred embodiment. [Figure 15] FIG. 13 is a side view of yet another embodiment. [Figure 16] 11 shows an embodiment similar to that shown in FIGS. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0034] Exemplary embodiments are shown in Figures 1, 2, 3, 4, 5, and 6. The other figures show other embodiments or variations thereof. Many of the figures are in an inclined position rather than upright, since travel cases are typically towed in this position.

[0035] 1 is a simple perspective view showing two wheels 20 mounted on a shiftable open frame 50, which is in an extended position outside of a body 80 as designed. The shiftable open frame 50, together with its guides, are the most important features of this embodiment. These parts mainly distinguish this embodiment from the prior art.

[0036] The upper double arrow in Fig. 1 indicates the direction of shifting or telescoping of the adjustable handle frame 90, which is typical for most trolley cases. The lower double arrow in Fig. 1 indicates the direction of shifting or sliding of the shiftable open frame 50. In this embodiment, both shifting directions are parallel to each other.

[0037] 2 is another simplified perspective view similar to FIG. 1 of the exemplary embodiment, but with hidden lines showing the complete shiftable open frame 50, as well as the complete handle frame 90. These hidden lines emphasize that the open frame 50, like the handle frame 90, is a telescoping and retractable portion.

[0038] 2 is a simplified view and does not show hidden lines indicating guides / sockets for the handle frame 90 and the shiftable open frame 50. Also not shown in this view are the locking mechanisms for the retracted and extended positions of the open frame and handle frame.

[0039] Figure 3 is yet another simplified perspective view of an exemplary embodiment. The open frame 50 shown in Figure 3 is in a contracted position, i.e., inside the body 80 as designed. This is a similar position or state to commonly available trolley cases, travel luggage, etc., and the locking mechanism and guides for the shiftable open frame 50 and handle frame 90 are also not shown in this view.

[0040] 4 is a side view of an exemplary embodiment, with the open frame 50 in a retracted position similar to that shown in FIG 3. The open frame 50 retracts into the body 80 as far as it is designed to, so that the two wheels 20 attached to the open frame 50 are closest to the body 80.

[0041] The mechanical locking members 40, 42, and 44 for the extended position of the open frame 50 are shown disengaged in Figure 4, where locking for the retracted position of the open frame 50 is facilitated by the attractive force of the magnets 30 and 32 relative to one another.

[0042] The two outer faces of the three-sided open frame 50 slide in two parallel enclosing tubes 60. These two tubes are built into the body 80. Two parallel built-in enclosing tubes 92 in which the two poles of the handle frame 90 slide are also shown in FIG.

[0043] 5 is a front view of the exemplary embodiment. The open frame 50 is in a retracted position. Its sides are inside the enclosing tubes or sockets 60 built into the body 80. Thus, the two wheels 20 mounted on the shiftable open frame 50 are near or adjacent to the body 80. This position is similar to the position shown in FIGS. 3 and 4.

[0044] Figures 5 and 4 together form a set of front and side views of an exemplary embodiment. The small side where the handle frame 90 enters into the trolley case body 80 is the top side. The small side where the movable opening frame 50 enters into the trolley case body 80 is the bottom side. The top side is angled away from the camera compared to the bottom side which is closer to the camera. The top side where the case is open is at the front. The bottom side which generally holds the case while it is open is away from the camera.

[0045] 6 is a side view of an exemplary embodiment. In this view, the open frame 50 is in an extended position, i.e., outside the body 80 as far as the design allows. This position is similar to the position shown in FIG. 1 and FIG. 2. The increased space and flex in the open frame 50 accommodates the edge 104 of the stair 102. Thus, it is possible to avoid the body 80 being scraped or scratched by the edge 104 of the stair 102 while pulling or towing the luggage up the stair 102.

[0046] 7 is a side view of a variation of the exemplary embodiment. The open frame 52 is shown in a retracted position. Thus, the wheels 20 thereon are closer to the body 80, making it ideal for towing the case on flat surfaces. The locking mechanism uses six magnets. Two magnets are embedded within the enclosing tube 62 on one side of the body 80, and similarly, two other magnets are embedded within the enclosing tube 62 on the other side of the body 80. Two magnets are embedded in the shiftable open frame 52, one on each side.

[0047] 8, which is another side view of a variation of the exemplary embodiment, the open frame 52 is now in an extended position, i.e., out of the body 80 as far as the design allows. The strong magnets 36 and 38 lock together to maintain the extended position of the open frame 52. As is evident from FIG. 8, the space between the wheels 20 and the body 80 of the luggage has increased due to the open frame 52 being extended (pulled) away from the body 80 from the retracted position shown in FIG.

[0048] 9 is a side view of an alternative embodiment. In this embodiment, an open frame 54 can rotate about a pivot 70 in the direction of the hollow arrow. A set of two wheels 20 are attached to the open frame 54. A strong magnet 48 embedded on one side of the open frame 54 locks with another strong magnet 44 embedded on that side of the body 80. Another strong magnet 48 embedded on the other side of the open frame 54 locks with another strong magnet 44 embedded on the other side of the body 80. This keeps the open frame 54 with the two wheels 20 in a position parallel to the longest side of the body 80.

[0049] Figure 10 is another side view of the alternative embodiment. After rotating the open frame in the direction shown by the hollow arrow in Figure 9, the position shown in Figure 10 is obtained. A strong magnet 48 embedded in one side of the open frame 54 is locked with another strong magnet 46 embedded in that side of the body 80. Another strong magnet 48 embedded in the other side of the open frame 54 is locked with another strong magnet 46 embedded in the other side of the body 80. This keeps the open frame 54 with the two wheels 20 in a position perpendicular to the longest side of the body 80.

[0050] 11 shows another embodiment similar to the exemplary embodiment. The exemplary embodiment has two simple wheels 20 mounted on the center side of the shiftable open frame 50, but instead of the simple wheels, this embodiment has two three-point star hubs 26. Three wheels 24 are mounted on each of these two hubs 26.

[0051] In a three-point star hub, three spoke-like arms extend radially from its center. In other words, a three-point star hub looks like a three-point star. A wheel is attached to the end of each of the three arms. Thus, each three-wheel star assembly has three wheels 24 attached to its central hub 26.

[0052] Figure 12 shows another embodiment similar to that shown in Figures 7 and 8. The embodiment shown in Figures 7 and 8 has two simple wheels 20 mounted on the center side of a shiftable open frame 52, this embodiment has two three-point star hubs 26 mounted on the center side of the shiftable open frame 52. Each of these hubs supports a set of three wheels 24.

[0053] Figure 13 is a side view of a preferred embodiment, where the main part is the shiftable open frame 56, which is a three-sided open frame that acts as an axis. In this embodiment, the outer two sides of the shiftable open frame 56 are curved as seen in this side view. The outer two sides of the open frame are not curved in most other embodiments.

[0054] On each side of the bottom of the trolley case shown in FIG. 13, there are pits 86. The pits 86 are like recesses or pockets that can accommodate the wheels 24. The open frame 56 is in a retracted position as shown in FIG. 13. In this position, there is a wheel 24 in each pit 86. Each of the wheels 24 that are in the pit 86 is attached to one of the three-point star hubs 26. Because these two wheels 24 (the top wheels shown) are in the pit 86, their respective hubs 26 cannot rotate. As shown in this figure, the other two wheels of both three-wheel star assemblies are in contact with the ground. This position is ideal for towing the trolley case on a flat surface and keeping the trolley case vertically stationary as shown in this figure.

[0055] Figure 14 is a front view of the preferred embodiment. Figure 14 is paired with Figure 13 to illustrate the retracted position of the open frame 56. An upper wheel 24 mounted on a three-point star hub 26 is in a pit 86 and close to the pit. Another upper wheel 24 mounted on another three-point star hub 26 is in a nearby pit 86. A lower wheel 24 mounted on a three-point star hub 26 hides another lower wheel 24 of the same assembly. This is also the case for other tri-wheel star assemblies, i.e., one of the lower wheels 24 hides the other lower wheel 24 of the same assembly.

[0056] Figure 15 is a side view of yet another embodiment, where two independent rods 58 slide in channels 66 on either side of the trolley case. The advantage of using two independent rods instead of an open frame is that the wheels can be retracted completely inside the confines of the case without complicating the design. This facilitates storage of the trolley case in tighter spaces. However, an open frame can also be used in this way.

[0057] Figure 16 shows an embodiment similar to that shown in Figures 9 and 10, but in a similar position to that of Figure 10, i.e. for towing a trolley case up stairs. Figure 16 shows that the angle between the open frame 54 and the body 80 does not have to be exactly vertical, i.e. 90 degrees, as shown in Figure 10.

[0058] Various embodiments of the present invention can be understood by the following description in conjunction with the accompanying drawings. The embodiments discussed herein and their respective drawings are for illustrative purposes only and are not limitations of the present disclosure. The term "rod" does not only refer to "rod with a non-circular cross section" but also to "thick rod with a non-circular cross section" or "rod with a preferably non-circular cross section".

[0059] Figures 1, 2, 3, 4, 5, and 6 show an exemplary embodiment. The shiftable open frame 50 shown in these figures is a three-sided open frame. The center side of this three-sided open frame acts as the axle for the wheels 20. Looking at Figures 1, 2, 3, and 5, it can be seen that these two wheels 20 are spaced apart from each other. One wheel 20 is near one end of the center side, and the other wheel is near the other end of the center side. The two outer sides of this frame are bent at an angle toward the bottom of the trolley case. The extent of the angle is the same on both outer sides. The extent or degree of this angle as shown in these figures is only representative and can be changed in various embodiments. This angle allows some additional space for the edge of the stairs between the body 80 and the wheels 20. This shiftable open frame 50 with the guide 60 and the two wheels 20 is the main member of the exemplary embodiment.

[0060] Here, the guides or sockets are stationary and parallel channels or enclosing tubes within which parts such as the shiftable opening frame 50 and the handle frame 90 slide. Two parallel built-in enclosing tubes 92 into which the two poles of the handle frame 90 slide are shown in Figures 4, 5 and 6. This is similar to commonly available trolley cases.

[0061] As shown in Figures 4, 5 and 6, the two sides of the three-sided open frame 50 slide within two parallel and stationary enclosing tubes 60. In other words, such built-in tubes 60 can be thought of as sockets or channels designed to receive both sides of the three-sided open frame 50 therein. These stationary tubes 60 also support the open frames 50 in addition to facilitating their sliding. These sockets or tubes can be built into or fixed to a movable object.

[0062] In the extended position, as shown in Figures 1, 2, and 6, the open frame 50 protrudes from the body 80 as designed. In the retracted position, as shown in Figures 3, 4, and 5, the open frame 50 is as inside the body 80 as the design allows.

[0063] The notches 40 shown in Figures 4, 5 and 6 are provided on both sides of a shiftable open frame 50. For each notch 40 there is a plunger 42, which is housed in a cavity 44 mounted in an enclosing tube 60 on the same side.

[0064] The two magnets 32 shown in Figures 4, 5 and 6 are embedded in the two enclosing tubes 60, one on each side of the trolley case. The two magnets 30 shown in Figures 4, 5 and 6 are embedded on the two outsides of the shiftable open frame 50.

[0065] In the retracted position shown in Figs. 4 and 5, the magnet 30 on one side is near the magnet 32 ​​on its side, and the magnet 30 on the other side is near the magnet 32 ​​on its side. Thus, there are two identical pairs of magnets 30 and 32, as seen in Fig. 5. In both pairs, the surfaces of the magnets 30 and 32 that are close to each other are of opposite polarity. Thus, in both pairs, the magnets 30 and 32 are attracted to each other. These magnets stay close to each other unless you stretch the open frame 50 by pulling it outward from the body 80. When these magnets are close to each other, they prevent the open frame 50 from extending (sliding outward) while lifting the load. In the retracted position shown in Figs. 4 and 5, the notches 40 are away from the plungers 42 on both sides of the trolley case.

[0066] As is evident from Figure 6, the space between the wheels 20 and the body 80 of the luggage has been increased by stretching (pulling) the open frame 50 away from the center of the body 80 from the position shown in Figures 5 and 4. The plungers 42 are located within the encircling tubes 60 attached to the body 80. These plungers 42 are located within corresponding notches 40 in the shiftable open frame 50. This prevents the open frame 50 from retracting by locking it to the body 80.

[0067] The shiftable open frame 50 carrying the wheels 20 is shown bent towards the rear of the case, facing the staircase 102. The extended position and angle of bending creates a space between the body 80 and the wheels 20 within which the edge 104 of the staircase 102 fits. As a result, the chances of the body 80 being scratched or scraped by the edge 104 of the staircase 102 are reduced while luggage, boxes, etc. are being towed up the staircase 102. This position is therefore ideal for pulling objects up the staircase.

[0068] The handle 84 is positioned to facilitate lifting the luggage while holding with one foot on the axle, i.e. the central side of the shiftable open frame 50. Thus, by holding the open frame 50 with one foot on it while lifting the trolley case by the handle 84, one can extend the axle and wheels away from the body of the luggage.

[0069] This causes the magnet 30 embedded in the shiftable open frame 50 to move away from the magnet 32 ​​attached to the body 80. These two sets of magnets 30 and 32 have been locked in the retracted position of the open frame, as shown in Figs. 4 and 5. We bring the notches 40 on the opposite side of the plungers 42 by pulling up the trolley case. Now, by sliding the plungers 42 into their respective notches 40, we can lock the open frame 50 in the extended position, as shown in Fig. 6. To make this procedure easier, we can have a spring-loaded plunger that automatically slides into the notch.

[0070] When it is desired to again tow the trolley case on a flat surface 100, such as a floor or paved ground, the plunger 42 is pulled back from the notch 40. Pullback star device The plungers 42 may have a spring that pushes them outwards and a mechanism that pushes the plungers 42 inwards, but is not shown in the drawings. There may be a simple notch or slot in the body to access the plungers. The plungers may have a serrated surface or tabs to slide them. The plungers 42 may have a spring that pushes them outwards and a mechanism that pushes the plungers 42 inwards. Pullback star-shaped The instrument may have a mechanism, strings, etc.

[0071] After the plunger 42 is retracted, if the trolley case is on its wheels 20, the cumulative weight of the body 80 and the objects therein can be used to slide (retract) the open frame 50 extended inside the body 80. If the cumulative weight of the body 80 is not enough, the body 80 can be pushed downward to retract the open frame 50 inside the body 80. If the trolley case is not on wheels, the shiftable open frame 50 can be pushed into the body 80 by hand, which will return the position shown in FIG. 6 to the position shown in FIG. 4.

[0072] When the open frame 50 is in the retracted position, the body of the luggage is lower, i.e., closer to the ground. Thus, the center of gravity of the entire movable luggage is lower in this position, which aids in stability while moving over rough terrain. Thus, this position is ideal for pulling the case over most surfaces that are reasonably flat but not on stairs. Less space is also required for storage in this position.

[0073] Instead of having a pair of magnets 30 and 32 on both sides, one can have only a pair of magnets on any one side. In other words, magnets 30 can be embedded on any one side of the shiftable open frame 50 and magnets 32 can be embedded in the enclosing tube 60 on the same side of the body 80. Similarly, one can have only one set of notches 40 and plungers 42 on any one side. In other words, one can use only one set of locking mechanisms for the retracted position and only one set of locking mechanisms for the extended position of the open frame 50.

[0074] A configuration requiring a slot and plunger with two magnets can be replaced with only two slots and plungers. It is also possible for us to have only one slot and two plungers.

[0075] Handle 82 is not shown in FIG. 5 because it is largely overlapped by identical handle 84 in this view.

[0076] From this figure, it is clear that in this embodiment there are two wheels 20, however, it is possible to have more wheels between the two wheels 20 on the shiftable open frame 50.

[0077] Instead of the shiftable open frame 50, there can be two sets of independent rods. These rods slide within built-in encasing tubes 60 on either side of the body 80 as shown in Figure 5. Each of these independent rods has a star stub axle (flat thick pin) mounted vertically at its free end. Each of these two star stub axles has a wheel 20 mounted on it.

[0078] An embodiment similar to the exemplary embodiment is shown in FIG. 11. Here, the central side of the shiftable open frame 50 is fitted with two three-point star hubs 26 instead of the wheels 20. Three wheels 24 are attached to each of the three-point star hubs 26. Thus, in this embodiment, these two three-wheel star assemblies are used instead of the usual two wheels 20 used in the exemplary embodiment, while the rest of the parts and mechanisms are similar. FIG. 11 shows the plungers 42 in the respective notches 40 for locking the open frame 50 in the extended position. A similar locking arrangement was previously described.

[0079] Instead of the shiftable open frame 50, there can be two independent shiftable rods. These rods extend from the body 80 and can be pushed back into it to the extent that the design allows. The free ends of each of these rods have star stub axles attached to them. A three point star hub 26 is attached to each of these star stub axles. Three wheels 24 are attached to each three point star hub 26. Additionally, there can be only one independent telescopic rod with more than two wheels or more than two three wheel star assemblies.

[0080] There may be a magnetic lock for the extended position and a mechanical lock for the retracted position of the handle frame 90, not shown in any of the figures. Also not shown is a stopper to prevent the open frame from falling out of the enclosing tube.

[0081] A variation of the exemplary embodiment is shown in Figures 7 and 8. The set of wheels 20 is mounted on an open frame 52 that can be extended at an angle (e.g., diagonally) away from the body 80 and pushed back adjacent to it.

[0082] The two outer faces of the three laterally shiftable open frame 52, which are parallel to one another, slide in two enclosing tubes 62 (sockets or channels), which are also parallel to one another and are integrated into the body 80.

[0083] 7 shows a strong (larger) magnet 36 separated from another strong magnet 38. This strong magnet 36 is close to a smaller (weaker) magnet 34, which locks the open frame 52. Because the magnet 34 is smaller, the total force required to extend the open frame 52 is less, yet sufficient to keep the open frame 52 locked in the retracted position while lifting the trolley case.

[0084] The retracted position shown in Figure 7 is ideal for pulling objects over a flat surface 100, as in this position the body 80 is lower, i.e., closer to the ground, compared to the extended position shown in Figure 8. This lowers the center of gravity of the entire movable object, helping to avoid tipping over small obstacles.

[0085] The handle 84 is secured in a position that facilitates pulling up the baggage while holding the center side of the open frame 52 with the feet, which moves the strong magnet 36 away from the small magnet 34. Subsequent pulling up of the baggage brings the strong magnets 36 and 38 closer together, causing them to lock into the extended position of the open frame 52, as shown in FIG.

[0086] The strong magnets 36 and 38 provide a relatively strong lock in the extended position of the open frame 52. This prevents the open frame 52 from contracting due to the weight superposition of the body 80 and its contents.

[0087] In the extended position, the increased space between the body 80 and the wheels 20 allows for adaptation to the edges 104 of the stairs 102. Thus, while pulling or dragging the trolley case up the stairs 102, the body 80 will not be scraped or scratched by the edges 104 of the stairs 102.

[0088] We could use a notch and plunger in the extended position and a set of magnets in the retracted position, as used in the exemplary embodiment, or to avoid magnets altogether, we could use two notches, one in the retracted position, one in the extended position, and one plunger that locks either one of these notches at a time.

[0089] Instead of the shiftable open frame 52, it is possible to have a set of two independent rods of any cross section, preferably non-circular, each with a star stub axle mounted vertically to support a wheel.

[0090] A similar embodiment to the exemplary embodiment variation is shown in Figure 12. Two three-point star hubs 26 are attached to the center side of the shiftable open frame 52. The wheels 24 are attached to star stub axles attached to each arm of the three-point star hubs 26. Thus, in this variation, instead of two wheels 20, there are two three-wheel star assemblies, and the rest is similar in this embodiment and the exemplary embodiment variation.

[0091] Instead of the shiftable open frame 52, there can be two independent (separate) extendable bars of any cross section, preferably non-circular. These bars can be extended at an angle, for example diagonally away from the body 80 (as in the variant of the exemplary embodiment), and pushed back (contracted) near it. Each of these bars has a star stub axle attached to their free end. One three-point star hub 26 is attached to the star stub axle of each extendable bar. Three wheels 24 are attached to each of these three-point star hubs 26.

[0092] An alternative embodiment is shown in Figures 9 and 10. In this embodiment, the open frame 54 is designed to rotate about a pivot 70.

[0093] The hollow arrow in FIG. 9 indicates the direction of rotating the open frame 54 toward the bottom of the trolley case, where the bottom of the trolley case is the surface that holds it for opening or storing it. By rotating the open frame 54, the wheels 20 mounted thereon are positioned so that the distance between the body 80 and the edge 104 of the staircase 102 is increased. As shown in FIG. 10, while the trolley case is dragged up the staircase 102, the increased distance creates enough space for the edge 104 of the staircase 102.

[0094] A strong magnet 48 is embedded on one side of the open frame 54, while another strong magnet 48 is embedded on the other side of the open frame 54. Two strong magnets 44 and 46 are embedded on one side of the body 80, around the swivel 70. Similarly, another set of these magnets 44 and 46 is embedded on the other side of the body 80.

[0095] 9, the two magnets 48 are strongly attracted to two strong magnets 44 embedded in the body 80 on two opposite sides. This maintains the open frame 54 with the two wheels 20 locked in a position parallel to the longest side of the body 80.

[0096] The position shown in Figure 9 is preferred for pulling the trolley case over a flat surface 100, since the center of gravity is between the wheels 20 and the handle frame 90. The trolley case cannot overcome small hurdles, bumps, etc. This position is also suitable for storing the case in a relatively small space, such as under a seat in a passenger train.

[0097] Rotating the open frame 54 in the direction shown by the double arrow in Figure 9 results in the position shown in Figure 10. This position shown in Figure 10 is for carrying the trolley case up stairs.

[0098] 10, a strong magnet 48 on one side is locked with a strong magnet 46 on the same side. Another strong magnet 48 on the other side is locked with another strong magnet 46 on the other side. This keeps the open frame 54 with its two wheels 20 in a position perpendicular to the longest side of the body 80.

[0099] This location is not ideal for storing the case in a relatively tight space, such as under a passenger train seat, but it can prevent the bottom from getting dirty if one or two small block feet 88 are secured further away from the lower wheels 20.

[0100] This position is also not ideal for pulling the case on flat surfaces, as the center of gravity of the trolley case does not necessarily remain between the wheels 20 and the handle frame 90. Carrying the trolley case on rough surfaces can be somewhat difficult. However, this position is suitable for towing the case up stairs.

[0101] The open frame 54 can be rotated in the opposite direction to that shown in FIG. 9 so that the trolley case can be easily transported again onto a flat surface.

[0102] The main difference between this embodiment and most other embodiments is that the open frame (in this case 54) or bar carrying wheels are rotated about swivel 70 in this case to accommodate the edge of the stairs, whereas in many other embodiments the open frame is extended linearly to accommodate the edge of the stairs.

[0103] 16, the magnets 46 can be placed on the sides of the body 80. In this position, the open frame 54 is locked in a position that is not exactly perpendicular to the body 80. We can change the position of the magnets 44 so that the open frame 54 is locked in a position that is not exactly parallel to the body 80.

[0104] A preferred embodiment is shown in Figures 13 and 14. In this embodiment, the outer two sides of the three-sided open frame 56 are curved bars instead of the straight bars used in the other embodiments discussed above. These curved bars side The two built-in enclosing tubes 64 are also curved to accommodate the

[0105] As previously mentioned, such enclosing tubes 64 can be thought of as sockets or channels built into the body 80. These tubes 64 are designed to hold two sides of the three-sided open frame 56 while allowing for contraction and expansion of the same open frame 56.

[0106] The locking mechanism, which is preferably embedded in the tube, is not shown to keep these figures simple and clear. We need to have a locking mechanism for both the retracted and extended positions. A locking mechanism similar to that used in the exemplary embodiment or the exemplary embodiment variants may be used. Instead of locking magnets, one could have magnets and iron blocks that lock together.

[0107] The underside of the trolley case has two spaced apart pockets or pits 86. As can be seen, a wheel 24 mounted on a three-point star hub 26 is horizontally spaced apart from a wheel 24 mounted on another three-point star hub 26. The centers of the two pits 86 are exactly the same horizontal distance apart as the centers of the two three-point star hubs 26.

[0108] Figure 13 shows that the two lower wheels 24 mounted on both 3-point star hubs 26 are in contact with the ground, while the third wheels on both of these 3-point star hubs 26 are above them.

[0109] In each of the pits 86, one of the wheels 24 mounted on the three-point star hub 26 can enter the vicinity of the open frame 56 when it is retracted. The wheel 24 in the pit 86 can be referred to as the upper wheel.

[0110] These pits 86 are different from typical vehicle wheel wells: the vehicle wheels rotate within their wheel wells, but the pits or pockets 86 are not designed for the trolley case wheels 24 to rotate within.

[0111] When the upper wheels 24 attached to the three-point star hub 26 are in the pocket or pit 86, the three-point star hub 26 cannot rotate. This position is ideal for towing the trolley case on a flat surface 100. In this case, the wheels of the two three-wheel star assemblies that are not in the pit allow the trolley to either remain stationary vertically on four wheels (two wheels of each of the two three-wheel star assemblies), or to move vertically or tilt on two wheels (one wheel of each of the two three-wheel star assemblies).

[0112] The wheel pockets (pits) may not be able to fully accommodate the wheels, but may only be deep enough to stop the three wheel star assembly from rotating. This embodiment has most of the features of the present invention.

[0113] The pockets or pits can be created in an embodiment similar to that shown in Figures 11 and 12. However, the location of these pits will not be exactly like the locations here.

[0114] Figure 15 shows another embodiment. It is a side view. This embodiment has two independent bars 58 at the bottom ends of both long sides of the trolley case. Each bar 58 has a wheel 20 at its free end. These bars 58 with the wheels 20 can slide or move in a channel or track 66. These sliding bars 58 extend from the underside of the trolley case and can be fully retracted within the confines of the case. These sliding bars 58 shown in Figure 15 are in an extended position, so that the wheels 20 are away from the body 80. This condition is ideal for towing the trolley case up stairs and on flat ground.

[0115] The advantage of using two independent sliding bars instead of a sliding open frame is that the wheels can be fully retracted within the confines of the trolley case without intermediate recesses or pits. This facilitates storage of the trolley case in tighter spaces. However, as with most other embodiments, a shiftable open frame could also be used. We could use any of the locking arrangements used in other embodiments (mentioned above), or any other type in this embodiment.

[0116] Instead of the two locking positions of the other embodiments, there may be three locking positions. The innermost lock fully retracts the wheels 20 inside the boundaries of the trolley case, which is ideal for storing the trolley case. The extreme extended position moves the wheels 20 furthest away from the body. This helps to provide space for the edges of stairs. Locking in this extended position therefore helps to tow the trolley case up stairs, especially on upper floors. There may be locking positions between the fully retracted and fully extended positions. Locking in this intermediate position therefore allows the trolley case to be easily towed on flat surfaces.

Claims

1. 1. A wheel assembly configured to be coupled to a moveable object to facilitate ascending and descending the moveable object on stairs, the wheel assembly comprising: one or more members, and a lock having one or more tubes or sliding tracks surrounding and supporting said one or more members, a first locking member embedded within at least one of said one or more members, a second locking member embedded within said one or more tubes or sliding tracks corresponding to said at least one of said one or more members, and a third locking member embedded within said one or more tubes or sliding tracks corresponding to said at least one of said one or more members; Or, one or more pivots configured to couple each corresponding one or more members to the movable object, and one or more locks corresponding to the one or more members; Equipped with each of the one or more members is an extendable and retractable rod or bar and has a first end, the first end attached to a stub axle perpendicular to the first end, each of the stub axles further coupled to a wheel or multi-wheel star cluster; each corresponding tube or sliding track allows each corresponding member to extend away from the movable object and contract towards the movable object when the corresponding tube or sliding track is embedded within the movable object; the first locking member and the second locking member are configured to secure at least one of the one or more members in an extended position relative to the movable object to facilitate ascent and descent of the movable object up and down stairs, and the first locking member and the third locking member are configured to secure at least one of the one or more members in a retracted position relative to the movable object to facilitate movement of the movable object on a flat surface and to store the movable object; each of the one or more pivots is configured to facilitate pivoting of a respective corresponding member relative to the movable object between a first position and a second position, each corresponding member being perpendicular to a longest side of the movable object when in the first position and parallel to a longest side of the movable object when in the second position; each of the one or more locks has a first locking member embedded within a respective corresponding member, a second locking member configured to couple to a respective corresponding member when in the first position, and a third locking member configured to couple to a respective corresponding member when in the second position, wherein the first locking member and the second locking member are configured to secure each corresponding member in the first position to facilitate ascent and descent of the movable object on stairs, and the first locking member and the third locking member are configured to secure each corresponding member in the second position to facilitate movement of the movable object on a flat surface and to store the movable object.

2. A wheel assembly as described in claim 1, comprising at least two members and a connecting member perpendicular to the at least two members, wherein the at least two members are connected to each other by the connecting member.

3. A wheel assembly as described in claim 1 or 2, wherein the lock or one or more locks have a plunger-notch mechanism, a pin-hole mechanism, a magnet-iron strip combination, an electromechanical mechanism, or an electromagnetic mechanism.

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