Positionable wheels for moving objects up and down stairs

Abstract

The present disclosure relates to arrangements containing movable parts, such as three-sided open frames or independent rods with stub axles. In some embodiments, the movable parts are designed for sliding movement within surrounding tubes. In other embodiments, the movable parts are designed to be pivotable by being attached to pivot points. These movable components are used to mount conventional wheels or multi-wheel star assemblies. Such assemblies can be attached to or incorporated into movable objects, such as luggage or robots, to facilitate their movement up or down stairs. When the wheels are positioned to keep the body of the movable object away from the edges of the stairs, the object can be moved up or down the stairs without being scratched.When the wheels are moved to a different position, the items can be moved effortlessly across flat surfaces. One of these positions is designed for storing the items in a smaller space.

Description

TECHNICAL FIELD

[0001] Sometimes it's necessary to carry things, objects, luggage, etc., up stairs or steps on the ground. Generally, you lift things and carry them up stairs or steps. Regular luggage, especially rolling suitcases, have two or more small wheels for pulling on flat surfaces, but these rolling suitcases cannot be dragged or pulled up stairs or steps.

[0002] Any of the embodiments presented here, or similar embodiments, may be attached to or incorporated into movable objects such as suitcases, containers, bags, cabinets, machines, etc. These embodiments may also be integrated into units intended for transporting other objects, such as carts, vehicles, robots, etc.

[0003] The arrangements presented here are used to position wheels by shifting the axles or rods supporting these wheels relative to the objects to be moved up a staircase. By using any of these arrangements or similar arrangements and applying an appropriate method, an object can be moved up or down a staircase. BACKGROUND OF THE INVENTION RELATING TO THE KNOWN TECHNOLOGY

[0004] Most people don't need to transport objects of a certain weight or size up and down stairs on a regular basis. Therefore, they don't put much effort into finding solutions for transporting their luggage up and down stairs. They may not be willing to pay for expensive, complex, and heavy-duty mechanisms to solve an occasional problem.

[0005] Currently, a typical rolling suitcase has two or more small wheels or casters attached to one of its smaller sides. This typical wheeled suitcase can be pulled over flat surfaces such as paved surfaces or floors using an extendable and retractable handle or strap. Only a few of these rolling suitcases have slightly larger wheels, either to overcome small obstacles or to carry greater weight.

[0006] There have been efforts to develop wheel assemblies that can be inserted into cavities or pockets provided for them inside suitcases to prevent dirt or dust on the wheels from contaminating the areas where these rolling suitcases are placed. One example of such a solution is US Patent No. 6612411 B2, which claims a method and apparatus for retracting and extending the wheels of a towable suitcase. Another example is US Patent No. 7861834 B2, which also claims a system of retractable wheels for towable luggage.

[0007] US Patent No. 5,306,027, entitled "Trolley with a retractable wheel assembly," claims an arrangement of retractable wheels for transporting objects such as golf bags. The wheels are retracted, i.e., raised, to keep the trolley stationary.

[0008] The rolling suitcases or carts mentioned in the previous paragraphs are not designed to be pulled up stairs. In rare cases, some rolling suitcases have large wheels for carrying heavy weight, overcoming obstacles, or climbing steps. However, these larger wheels are not desirable on flat surfaces.

[0009] Some trolleys have two sets of multi-wheel arrangements instead of regular wheels. These wheel arrangements are generally tricycle star arrangements, although quadruple star arrangements are sometimes used. A tricycle star arrangement consists of three wheels, each located at the end of a radial spoke (arm) of a central hub. Such arrangements are useful for transporting trolleys up and down stairs by pulling them behind the wheel.

[0010] In other words, a tricycle star assembly has three spoke-like arms extending radially from its center or hub. Each arm has a stub axle mounted at right angles to it. All three stub axles are parallel to each other. A wheel is attached to each stub axle. Thus, every tricycle star assembly has a central hub with three wheels attached to it. The axes of all three wheels are parallel to the axis of the central hub.

[0011] These three- or four-wheel star arrangements are sometimes referred to as spider-like wheel arrangements. These multi-wheel arrangements make it easier to pull or drag suitcases up or down stairs, compared to single wheels. However, these multi-wheel arrangements make it difficult to store suitcases in tight spaces, such as under passenger seats or in overhead storage compartments. These multi-wheel arrangements also make it somewhat difficult to drag such suitcases across flat surfaces.

[0012] US Patent No. 7669862 B2 claims a collapsible spider-like wheel assembly on a towing device that allows the device to be housed in a standard rectangular space. The purpose of this collapsible wheel assembly is to ensure that the wheels of the spider assembly are protected within the body of the towing device while it is stowed. Unlike the present disclosure, the axles of these spider-like wheel assemblies remain immobile near the body of the objects.

[0013] US Patent No. 6,938,740, entitled "Suitcase with Stair Roller and Brake," claims a plurality of spaced-apart, also stationary, axles. A disadvantage of this concept and some other concepts and devices for climbing stairs is the inherent complexity. These complex mechanisms built into the luggage or suitcases make them more expensive and / or heavier.

[0014] It is possible that some of the already patented designs are easier to operate than some of the embodiments of the present invention. If battery-powered tricycle star assemblies were manufactured for ordinary luggage, they would be easier to operate, but would be more expensive and heavier. Such electric tricycle star assemblies are required for robots with stair-climbing capabilities. Currently, customers do not want complex rolling suitcases or carts, as these would be both expensive and heavy.

[0015] Some existing arrangements and techniques are simpler in design and easier to operate than most of the embodiments presented here, but require more space for storing the object and / or are difficult to transport on flat surfaces. One example is a simple rolling suitcase with two tricycle star arrangements. OBJECT OF THE INVENTION

[0016] Most embodiments of the present disclosure and related arrangements are designed to provide fairly simple and / or economical solutions for transporting objects up and down stairs. These solutions are alternatives to manually lifting objects to prevent their sides and edges from rubbing against the edges of stairs or steps on the floor.

[0017] Since most of the arrangements presented here are relatively simple, they require little maintenance. The methods for operating them are also simpler. Some embodiments use arrangements that are not very simple, but are easier to operate.

[0018] A unit employing any of these arrangements can be handled almost like a standard rolling suitcase when moved across a flat surface. Most of the embodiments described here are designed to be easily integrated into mass-produced objects such as rolling suitcases or robots without significant weight and / or cost increases. PRESENTATION OF THE INVENTION

[0019] The embodiments of the present disclosure include assemblies of positionable wheels mounted on pivoting 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 provide assistance when pulling or moving these objects up or down stairs, using the appropriate methods or techniques.

[0020] Most of the assemblies presented here involve sliding frames or sliding frames that act as axles. Some assemblies involve separate sliding bars or sliding bars that have stub axles. The wheels mounted on the frame axles or stub axles mounted on separate bars can thus be moved further away from and closer to the main bodies of the movable objects. Some assemblies are intended to accomplish wheel positioning by pivoting the axle around the body of the object. Most of these assemblies can increase the distance between the body or torso of the movable objects and their wheels. This increased distance, or the merely shifted position of the wheels, provides enough space for the edges of the steps between the body and the wheels.The wheels can be retracted or moved back to their original position to allow for effortless transport on flat surfaces and / or storage in smaller spaces.

[0021] The main component of most designs is an open three-sided frame, with its central side serving as the axle for the wheels. This frame, together with the usual wheels or multi-wheel star assemblies, can be extended—that is, pulled out of the surrounding tubes or sleeves as far as the design allows, and retracted into them. The surrounding tubes are attached to or built into the body of the movable object. These arrangements and related methods are helpful in preventing contact between the main bodies of movable objects and the edges of stair treads. CONTENT OF THE INVENTION

[0022] The positionable wheel arrangements and methods presented here are designed to be simple, easy to use, economical, and lightweight. These arrangements are intended to assist in moving objects up and down stairs.

[0023] The main part of most designs is a sliding frame that can be extended and retracted. The word "frame" generally refers to a four-sided closed frame. However, the frame used here is a three-sided or "open" frame, meaning that the fourth side that closes a typical frame is not present because it is not needed. This is similar to three-sided door frames.

[0024] In these open frames, two identical sides are connected by a central side. The central side is preferably perpendicular to the two identical sides. These two opposite sides are mirror images of each other and are also parallel to each other. The central side connects the two identical sides at their respective ends. Thus, at a certain angle, a typical open frame appears in the shape of a rectangular U. It is possible that the central side is not simply straight from end to end; it may have bends or a curve in places where no wheels are attached. It is also possible that the two parallel sides attached to the central side are not straight; they may have bends, a curve, etc., as is the case in one embodiment.

[0025] The two parallel sides slide within two surrounding (outer) tubes, which are also parallel. These tubes can be attached to or built into movable objects such as suitcases, containers, boxes, robots, etc.

[0026] Two conventional wheels or multi-wheel star arrangements are arranged at a distance along the middle side. Thus, the middle side acts as an axle. This extendable and retractable open frame, which acts as an axle, can be visualized as an 'open sliding frame' or 'open sliding frame'.

[0027] In most embodiments, the open sliding frame can be slid relative to the main body of the object. In this way, conventional wheels or multi-wheel star assemblies mounted on the open frame are moved away from or toward the main body of the object. One embodiment features independently movable 'stub-axle rods', with two conventional wheels or multi-wheel star assemblies mounted at their free ends.

[0028] In one embodiment, the open frame can be pivoted or shifted using conventional wheels or multi-wheel star assemblies to move them around the object. Another embodiment uses independent pivoting rods with stub axles attached to their free ends. Each of these stub axles carries either a single wheel or a multi-wheel star assembly.

[0029] By sliding or pivoting the open frame or stub-axle rods, a gap is created between the main body of the object and the wheels or wheel assemblies. This gap accommodates the edges of the stair treads, allowing the object to be moved up or down a flight of stairs without being scratched.

[0030] The open frame can be retracted, bringing the wheels or multi-wheel star assemblies close to the object for storage in relatively small spaces, such as under the seats of passenger trains or in the overhead storage compartments of airplanes. This position may be better for transporting the object over flat surfaces. BRIEF DESCRIPTION OF THE ATTACHED DRAWINGS

[0031] A precise understanding of the various embodiments presented herein can be gained by reading the following brief descriptions of the accompanying drawings. The drawings are not intended to limit the present invention, but are for illustrative purposes only.

[0032] Three simple perspective views are used to quickly convey the design of an exemplary embodiment. Since it is convenient to depict details in side views for the arrangements presented here, most of the figures are side views. Only two views are front views, which are intended solely to clarify what cannot be clearly explained in a few words if only side views are used.

[0033] An example is shown in the Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5 and Fig. 6. Further figures show further embodiments or variations of these. Many of the views are not shown in an upright position, but in an inclined position, since suitcases are generally pulled in this position.

[0034] Fig. Figure 1 is a simple perspective view showing two wheels 20 mounted on a sliding open frame 50. This open frame 50 is in the extended position, located as far outside the body 80 as the design allows. This sliding open frame 50, along with its guides, is the most important feature of this embodiment. These parts constitute the main difference between the prior art and this embodiment.

[0035] The upper arrow with two tips in Fig. Figure 1 shows the direction of sliding or telescopic movement of the adjustable handle frame 90, which is common in most rolling suitcases. The lower arrow with two heads in Fig. 1 shows the direction of displacement or sliding displacement of the movable open frame 50. The directions of both displacements are parallel to each other in this embodiment.

[0036] Fig. 2 is another simple perspective view, similar to Fig. 1 of the embodiment, but with hidden lines showing the complete sliding open frame 50 and the complete handle frame 90. These hidden lines emphasize that the open frame 50 is an extendable and retractable part, similar to the handle frame 90.

[0037] There Fig. 2 is a simple view, the hidden lines indicating guides / sleeves of the hand frame 90 and the sliding open frame 50 are not shown. The locking mechanisms for the retracted and extended positions of the open frame and the handle frame are also not shown in this figure.

[0038] Fig. 3 is yet another simple perspective view of the embodiment. The Fig. The open frame 50 shown in Figure 3 is in the retracted position, ie, as far inside the body 80 as the design allows. This is the position or condition similar to commonly available rolling suitcases, luggage, etc. Locking mechanisms and guides for the sliding open frame 50 and the handle frame 90 are also not shown in this figure.

[0039] Fig. Figure 4 is a side view of the embodiment. The open frame 50 is in the retracted position, similar to that shown in Fig. 3. Since the open frame 50 is retracted into the body 80 as far as design allows, the two wheels 20 mounted on the open frame 50 are located as close as possible to the body 80.

[0040] Mechanical locking components 40, 42 and 44 for the extended position of the open frame 50 are in Fig. 4 is shown as disengaged. Locking of the retracted position of the open frame 50 is enabled by the mutual attraction of magnets 30 and 32.

[0041] The two outer sides of the three-sided open frame 50 perform a sliding displacement in two parallel surrounding tubes 60. These two tubes are built into the body 80. The two parallel built-in surrounding tubes 92, in which the sliding displacement of the two rods of the handle frame 90 takes place, are also in Fig. 4 shown.

[0042] Fig. Figure 5 is a front view of the embodiment. The open frame 50 is in the retracted position. Its sides are located within the surrounding tubes or sleeves 60 built into the body 80. Thus, the two wheels 60 attached to the sliding open frame 50 are near or closer to the body 80. This position is similar to those shown in Fig. 3 and Fig. 4 are shown.

[0043] The Fig. 5 and Fig. 4 together form a set of front and side views of the exemplary embodiment. The short side, from which the handle frame 90 enters the main body 80 of the rolling suitcase, is the top side. The short side, from which the sliding open frame 50 enters the main body 80 of the rolling suitcase, is the bottom side. The top side is inclined away from the viewer, compared to the bottom side, which is closer to the viewer. The top side, from which the suitcase is opened, is the front side. The bottom surface, on which the suitcase is usually rested while opening it, is located away from the viewer.

[0044] Fig. Figure 6 is a side view of the embodiment. In this figure, the open frame 50 is in the extended position, ie, as far outside the body 80 as the design allows. This position is similar to that shown in Fig. 1 and Fig. 2. The increased space and the curvature in the open frame 50 accommodate the edges 104 of the stairs 102. Thus, when pulling or dragging luggage up the stairs 102, the body 80 can be prevented from being chafed or scratched by the edges 104 of the stairs 102.

[0045] Fig. Figure 7 is a side view of a variant of the embodiment. The open frame 52 is shown in a retracted position. Thus, the attached wheels 20 are closer to the body 80, which is ideal for pulling the case across flat surfaces. The locking mechanism utilizes six magnets. Two magnets are embedded in the surrounding tube 62 on one side of the body 80, and similarly, two more magnets are embedded in the surrounding tube 62 on the other side of the body 80. Two magnets are embedded in the sliding open frame 52, one on each side.

[0046] In Fig. 8, which is another side view of the variant of the embodiment, the open frame 52 is in the extended position, ie, as far outside the body 80 as the design allows. The strong magnets 36 and 38 lock each other to maintain the extended position of the open frame 52. In Fig. 8 it can be clearly seen that the space between the wheels 20 and the body 80 of the luggage has been increased since an extension (pulling out) of the open frame 52 has been carried out, away from the body 80 from the position shown in Fig. 7 shown retracted position.

[0047] Fig. 9 is a side view of an alternative embodiment. In this embodiment, the open frame 54 can be pivoted about the pivot point 70 in the direction of the hollow arrow. A set of two wheels 20 is attached to the open frame 54. A strong magnet 48 embedded in one side of the open frame 54 is locked to another strong magnet 54 embedded in that side of the body 80. Another strong magnet 48 embedded in the other side of the open frame 54 is locked to another strong magnet 54 embedded in the other side of the body 80. This holds the open frame 54 with two wheels 20 in a position parallel to the longest side of the body 80.

[0048] Fig. Figure 10 is another side view of the alternative embodiment. After pivoting the open frame in the direction indicated by the hollow arrow in Fig. 9 direction you reach the direction shown in Fig. 10. A strong magnet 48 embedded in one side of the open frame 54 is locked to 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 to another strong magnet 46 embedded in the other side of the body 80. This holds the open frame 54 with two wheels 20 in a position perpendicular to the longest side of the body 80.

[0049] Fig. Figure 11 shows another embodiment similar to the exemplary embodiment. The exemplary embodiment has two single wheels 20 mounted on the center side of the sliding open frame 50, while this embodiment has two three-pointed star hubs 26 instead of single wheels. Three wheels 24 are mounted on each of these two hubs 26.

[0050] In a three-pointed star hub, three spokes extend radially from their center like arms. In other words, a three-pointed star hub resembles a star with three points. A wheel is attached to the end of each of its three arms. Thus, each three-wheel star assembly has three wheels 24 mounted on its center hub 26.

[0051] Fig. Figure 12 shows another embodiment similar to that shown in Fig. 7 and Fig. 8. The embodiment shown in the Fig. 7 and Fig. The embodiment illustrated in Figure 8 has two simple wheels 20 mounted on the central side of the sliding open frame 52, while this embodiment has two three-pointed star hubs 26 mounted on the central side of the sliding open frame 52. Each of these hubs carries a set of three wheels 24.

[0052] Fig. Figure 13 is a side view of the preferred embodiment. The main part here is the sliding open frame 56, which is a three-sided open frame that acts as an axle. In this embodiment, the outer two sides of the sliding open frame 56 are curved, as shown in this side view. The outer two sides of open frames in most other embodiments do not have any curvature.

[0053] On each side of the floor of the Fig. 13, there is a recess 86. A recess 86 is similar to a recess or a pocket that can accommodate a wheel 24. The open frame 56 is in the retracted position, as shown in Fig. 13. In this position, one wheel 24 is located in each of the recesses 86. Each of the wheels 24 located in the recesses 86 is mounted to one of the three-pointed star hubs 26. Because these two wheels 24 (the upper one in each case, as shown) are located in the recesses 86, their respective hubs 26 cannot rotate. The other two wheels of the two three-pointed star assemblies touch the ground, as shown in this figure. This position is ideal for pulling the trolley on level surfaces and for keeping the trolley vertical at rest, as shown in this figure.

[0054] Fig. 14 is a front view of the preferred embodiment. Fig. 14 forms a sentence with Fig. 13 to describe the retracted position of the open frame 56. An upper wheel 24 mounted on a three-pointed star hub 26 is located in the recess 86 adjacent thereto. Another upper wheel 24 mounted on another three-pointed star hub 26 is located in the recess 86 adjacent thereto. A lower wheel 24 attached to a three-pointed star hub 26 conceals another lower wheel 24 of the same assembly. This is also the case for the other three-wheel star assembly, i.e., one of its lower wheels 24 conceals the other lower wheel 24 of the same assembly.

[0055] Fig. Figure 15 is a side view of yet another embodiment. Here, two independent rods 58 slide within channels 66 on both longer sides of the trolley. The advantage of using two independent rods instead of an open frame is that the wheels can be fully retracted into the perimeter of the suitcase without complicated design. This makes it easier to store the trolley in small spaces. However, an open frame can also be used in this manner.

[0056] Fig. Figure 16 shows an embodiment similar to that shown in Fig. 9 and Fig. 10. It is in a state similar to Fig. 10, ie for pulling the trolley case up and down stairs. Fig. 16 shows that it is possible that the angle between the open frame 54 and the body 80 is not exactly right-angled, ie 90°, as in Fig. 10 shown. DETAILED DESCRIPTION OF THE INVENTION WITH REFERENCE TO THE DRAWINGS

[0057] Various embodiments of the invention can be understood from the following descriptions together with the accompanying drawings. The embodiments discussed herein and their respective drawings are for illustrative purposes only and do not limit the present disclosure. The word 'rod' means not only 'rod with a non-circular cross-section', but also 'thick rod with a non-circular cross-section' or 'bar, preferably with a non-circular cross-section'.

[0058] The Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5 and Fig. 6 show an embodiment. The movable open frame 50 shown in these figures is a three-sided open frame. The middle side of this three-sided open frame acts as the axle for the wheels 20. Fig. 1, Fig. 2, Fig. 3 and Fig. 5, it can be seen that these two wheels 20 are arranged at a distance from each other. One wheel 20 is located near one end of the middle side, while the other is located near the other end of the middle side. The outer two sides of the frame are bent at an angle to the bottom of the trolley. The size of the angle is the same for both outer sides. The size or extent of this angle, as shown in these figures, is for illustrative purposes only and can be varied in different embodiments. This angle adds a certain amount of clearance between the body 80 and the wheels 20 for the edges of the stairs. This sliding open frame 50 with guides 60 and two wheels 20 is the main component of the exemplary embodiment.

[0059] Guides or sleeves are stationary and parallel channels or surrounding pipes within which a sliding movement of parts such as the movable open frame 50 and the handle frame 90 takes place. The two parallel built-in surrounding pipes 92, in which the sliding movement of the two rods of the handle frame 90 takes place, are in the Fig. 4, Fig. 5 and Fig. 6. This is similar to commonly available rolling suitcases.

[0060] The two sides of the three-sided open frame 50 are sliding within two parallel and stationary surrounding tubes 60, as shown in Fig. 4, Fig. 5 and Fig. 6. In other words, such built-in tubes 60 can be thought of as sleeves or channels designed to receive the two sides of the three-sided open frame 50. These stationary tubes 60 also support the open frame 50, in addition to enabling its sliding movement. These sleeves or tubes could be built into or attached to movable objects.

[0061] In the extended position, as shown in the Fig. 1, Fig. 2 and Fig. 6, the open frame 50 is located as far outside the body 80 as design allows. In the retracted position, as shown in Fig. 3, Fig. 4 and Fig. 5, the open frame 50 is located as far inside the body 80 as design allows.

[0062] The notches 40, which are in the Fig. 4, Fig. 5 and Fig. 6 are located on both sides of the sliding open frame 50. For each notch 40 there is a plunger 42 which is housed in the cavity 44 built into the surrounding tube 60 on the same side.

[0063] The two magnets 32, which are in the Fig. 4, Fig. 5 and Fig. 6 are embedded in the two surrounding tubes 60, one on each side of the trolley case. Two magnets 30, which are Fig. 4, Fig. 5 and Fig. 6 are embedded in the two outer sides of the sliding open frame 50.

[0064] In the Fig. 4 and Fig. In the retracted position shown in Figure 5, the magnet 30 located on one side is close to the magnet 32 ​​located on its side, while the other magnet 30 located on the other side is close to the magnet 32 ​​located on its side. Thus, one has two identical pairs of magnets 30 and 32, as 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 remain close to each other unless the open frame 50 is extended by pulling it outward from the body 80. These magnets, when close to each other, prevent the open frame 50 from extending (sliding outward) while the luggage is being lifted. Fig. 4 and Fig. In the retracted position shown in Figure 5, the notches 40 are located on both sides of the trolley case away from the tappets 42.

[0065] In Fig. 6 it can be seen that the space between the wheels 20 and the body 80 of the luggage has been increased because the open frame 50 has been extended (pulled out) away from the center of the body 80 from the position shown in the Fig. 5 and Fig. 4. The plungers 42 are located in the surrounding tubes 60, which are attached to the body 80. These plungers 42 are positioned in the corresponding notches 40 of the sliding open frame 50. This prevents the open frame 50 from retracting by locking it to the body 80.

[0066] The wheels 30 supporting the sliding open frame 50 are shown bent toward the rear of the case, facing the stairs 102. The extended position and angle of bend create a gap between the body 80 and the wheels 20 that accommodates the edges 104 of the stairs 102. As a result, the likelihood of the body 80 being scratched or abraded by the edges 104 of the stairs 102 when dragging the luggage, a box, etc., up the stairs 102 is reduced. Thus, this position is ideal for pulling the item up stairs.

[0067] The handle 84 is positioned to facilitate pulling the luggage while holding the axle, i.e., the center side of the sliding open frame 50, with a foot. Thus, by holding the open frame 50 by placing their foot over it while lifting the trolley case using the handle 84, a person can pull the axle and wheels out away from the body of the luggage.

[0068] During this process, the magnets 30 embedded in the sliding open frame 50 move away from the magnets 32 attached to the body 80. The sets of these two magnets 30 and 32 were locked in the retracted position of the open frame, as shown in Fig. 4 and Fig. 5. Now, by pulling up the trolley case, the notches 40 are brought into a position opposite the plungers 42. By sliding the plungers 42 into the respective notches 40, one is able to lock the open frame in the extended position, as shown in Fig. 6. To simplify this procedure, spring-loaded plungers can be provided that automatically slide into the notches.

[0069] If, in turn, one wishes to pull the trolley case along a flat surface 100, such as a floor or paved ground, the plungers 42 will be pulled out of the notches 40. Devices or mechanisms for retracting the plungers are not shown in the drawing. There could simply be notches or slots in the body to provide access to the plungers. The plungers may have toothed surfaces or tabs for sliding them. The plungers 42 may have springs that urge them outward and a mechanism, cords, etc., to retract the plungers 42.

[0070] After retracting the plungers 42, the cumulative weight of the body 80 and the items contained therein can be used to cause the extended open frame 50 to slide (retract) into the body 80 when the trolley is on its wheels 20. If the cumulative weight of the body 80 is not sufficient, then the body 80 can be pushed downwards to push the open frame 50 into the body 80. If the trolley is not on its wheels, then the sliding open frame 50 can be pushed into the body 80 by hand. This will Fig. 6 shown position in the Fig. 4 shown position.

[0071] When the open frame 50 is in the retracted position, the body of the luggage is lower, i.e., close to the ground. The center of gravity of the entire movable luggage is thus lower in this position, which contributes to stability when moving over uneven surfaces. Thus, this position is ideal for pulling the suitcase over most reasonably flat surfaces, but not for pulling it up stairs. The space required for storage is also smaller in this position.

[0072] Instead of having a pair of magnets 30 and 32 on both sides, there may be only one pair of magnets on either side. In other words, a magnet 30 may be embedded on either side of the sliding open frame 50, and a magnet 32 ​​may be embedded in the surrounding tube 60 on the same side of the body 80. Similarly, only a single set of a notch 40 and a plunger may be present on either side. In other words, only a single set of locking mechanisms may be used for the retracted position and only a single set of locking mechanisms may be used for the extended position of the open frame 50.

[0073] The arrangement requiring a slot and a plunger along with two magnets can be replaced with just two slots and a plunger. It is also possible to have only a single slot and two plungers.

[0074] The handle 82 is in Fig. 5 is not shown, since in this view it would be largely covered by the identical handle 84.

[0075] It is clear from this figure that there are two wheels 20 in this embodiment, but there may be a larger number of wheels between the two wheels 20 on the sliding open frame 50.

[0076] Instead of a sliding open frame 50, there may be a set of two independent rods. These rods slide in the built-in surrounding tubes 60 located on each side of the body 80, as shown in Fig. 5. Each of these independent rods has a stub axle (a common thick pin) attached at right angles to it at its free end. A wheel 20 is mounted on each of these two stub axles.

[0077] An embodiment similar to the embodiment is shown in Fig. 11. Here, two three-pointed star hubs 26 are mounted instead of wheels 20 on the middle side of the sliding open frame 50. Three wheels 24 are mounted on each of the three-pointed star hubs 26. Thus, these two three-wheel star assemblies are used in this embodiment instead of the regular two wheels 20 used in the illustrated embodiment; the remaining components and mechanisms are similar. Fig. Figure 11 shows the plungers 42 in the respective notches 40 to lock the open frame 50 in the extended position. Similar locking arrangements have been previously explained.

[0078] Instead of the sliding open frame 50, two independent sliding rods may be provided. These rods can be extended from and retracted into the body 80 to the extent permitted by the design. The free ends of each of these rods have a stub axle attached thereto. A three-point star hub 26 is mounted on each of these stub axles. Three wheels 24 are mounted on each three-point star hub 26. Furthermore, only a single independent extendable rod may be provided with more than a single wheel or more than a single tricycle star arrangement.

[0079] There may be a magnetic lock for the extended position and a mechanical lock for the retracted position of the handle frame 90, although this is not shown in any of the figures. The stops that prevent the open frame from falling out of the surrounding tubes are also not shown.

[0080] A variant of the embodiment is shown in Fig. 7 and Fig. 8. A set of wheels 20 are attached to the open frame 52, which can be extended and retracted at an angle (e.g., diagonally) away from the body 80 and pushed back close thereto.

[0081] The two outer sides of the three-sided sliding open frame 52, which are parallel to each other, are slidably displaced within the two surrounding tubes 62 (sleeves or channels). These tubes 62 are also parallel to each other and are incorporated into the body 80.

[0082] Fig. Figure 7 shows that the strong (larger) magnet 36 is located away from the other strong magnet 38. This strong magnet 36 is located near the smaller (weaker) magnet 34 to lock the open frame 52. Due to the smaller magnet 34, the total force required to extend the open frame 52 is lower, but it is sufficient to hold the open frame 52 in the retracted position when lifting the trolley case.

[0083] The Fig. The retracted position shown in Figure 7 is ideal for pulling the object over a flat surface 100, since in this position the main body 80 is lower, ie close to the ground, compared to the position shown in Fig. 8. This lowers the center of gravity of the entire movable object and helps prevent it from tipping over due to small obstacles.

[0084] The handle 84 is positioned to make it easier to pull the luggage up while holding the middle side of the open frame 52 with your foot. This action moves the strong magnet 36 away from the smaller magnet 34. Continuing to pull the luggage up brings the strong magnets 36 and 38 close together, and they are locked in the extended position of the open frame 52, as shown in Fig. 8 shown.

[0085] 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 retracting due to the combined weight of the body 80 and its contents.

[0086] In the extended position, the increased clearance between the body 80 and the wheels 20 accommodates the edges 104 of the stairs 102. Thus, when the trolley is pulled or dragged over the stairs 102, the body 80 is not abraded or scratched by the edges 104 of the stairs 102.

[0087] Notches and plungers can be used for the extended position, and a set of magnets can be used for the retracted position, as used in the exemplary embodiment. Or, to avoid magnets entirely, two notches can be used, one for the retracted position and one for the extended position, and a plunger that locks into each of these notches.

[0088] Instead of a sliding open frame 52, a set of two independent bars of any cross-section, preferably of a non-circular cross-section, may be provided. Each bar has a stub axle mounted at right angles to it for supporting a wheel.

[0089] An embodiment similar to the variant of the embodiment is shown in Fig. 12. Mounted on the center side of the sliding open frame 52 are two three-point star hubs 26. A wheel 24 is mounted on a stub axle attached to each arm of a three-point star hub 26. Thus, in this variant, there are two three-wheel star assemblies instead of two wheels 20; the remaining details are similar between this embodiment and the variant of the exemplary embodiment.

[0090] Instead of the sliding open frame 52, two independent (separate) extendable rods of any cross-section, preferably non-circular, may be provided. These rods can be extended (similar to a variant of the embodiment) at an angle, e.g., diagonally away from the body 80, and pushed back (retracted) close to it. Each of these rods has a stub axle attached to its free end. A three-point star hub 26 is mounted on the stub axle of each extendable rod. Three wheels 24 are mounted on each of these three-point star hubs 26.

[0091] An alternative embodiment is shown in Fig. 9 and Fig. 10. In this embodiment, the open frame 54 is designed to pivot about the pivot point 70.

[0092] The hollow arrow in Fig. Figure 9 shows the direction for pivoting the open frame 54 toward the bottom of the trolley. The bottom of the trolley is the surface on which it is stored for opening or stowing. By pivoting the open frame 54, the wheels 20 attached to it are positioned so that the distance between the body 80 and the edges 104 of the steps 102 is increased. The increased distance creates sufficient clearance for the edges 104 of the steps 102 when the trolley is pulled over the steps 102, as shown in Fig. 10 shown.

[0093] A powerful magnet 48 is embedded on one side of the open frame 54, while another powerful magnet 48 is embedded on the other side of the open frame 54. Two powerful magnets, 44 and 46, are embedded on one side of the body 80, around the pivot point 70. Similarly, another set of these magnets, 44 and 46, is embedded on the other side of the body 80.

[0094] In the Fig. In the position shown in Figure 9, the two magnets 48 are strongly attracted to the two powerful magnets 44 embedded in the body 80 on two opposite sides. This holds the open frame 54 with two wheels 20 locked in a position parallel to the longest side of the body 80.

[0095] The Fig. The position shown in Figure 9 is preferable for pulling the trolley case over a flat surface 100, as the center of gravity is located between the wheels 20 and the handle frame 90. The trolley case cannot tip over when passing small obstacles, bumps, etc. This position is also better for storing the case in a relatively small space, such as under the seats of a passenger train.

[0096] If you look at the open frame 54 in the direction indicated by the double arrow Fig. 9, change the position to that shown in Fig. 10 shown position. This in Fig. The position shown in 10 is used to transport the trolley case up stairs.

[0097] In the Fig. In the position shown in Figure 10, a powerful magnet 48 located on one side is locked to a powerful magnet 46 located on the same side. Another powerful magnet 48 located on the other side is locked to another powerful magnet 46 located on that other side. This holds the open frame 54 with two wheels 20 in a position perpendicular to the longest side of the body 80.

[0098] This position is not ideal for storing the case in relatively small spaces, such as under the seats of a passenger train. However, this position can prevent the underside from becoming dirty by attaching one or two small support blocks 88 to the underside further away from the wheels 20.

[0099] This position is also not ideal for pulling the suitcase across a flat surface, as the center of gravity of the trolley case may not always remain between the wheels (20) and the handle frame (90). It may be somewhat difficult to transport the trolley case across uneven surfaces. However, this position is better for pulling the suitcase up stairs.

[0100] The open frame 54 can be moved in the direction opposite to that shown in Fig. 9 to transport the trolley case over flat surfaces.

[0101] The main difference between this embodiment and most other embodiments is that, in order to accommodate the edges of the stairs, the open frame (54 in this case) or the bars carrying the wheels are pivoted about a pivot point 70 in this case, whereas in many other embodiments the open frames are extended in a linear manner to accommodate the edges of the stairs.

[0102] The magnets 46 may be positioned on the sides of the body 80, as shown in Fig. 16. In this position, the open frame 54 is locked in a position that is not exactly perpendicular to the body 80. The position of the magnets 44 can be changed so that the open frame 54 is locked in a position that is not exactly parallel to the body 80.

[0103] The preferred embodiment is in Fig. 13 and Fig. 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 previously discussed embodiments. To accommodate these curved sides, the two built-in surrounding tubes 64 are also curved.

[0104] As previously explained, such surrounding tubes 64 can be considered as sleeves or channels built into the body 80. These tubes 64 are designed to support the two sides of the three-sided open frame 56 while allowing the retraction and extension of the same open frame 56.

[0105] The locking mechanisms, which are preferably embedded in the tubes, are not shown to keep the illustrations simple and clear. It is not necessary to have locking mechanisms for both the retracted and extended positions. Similar locking mechanisms as in the exemplary embodiment or a variant of the exemplary embodiment can be used. Instead of locking magnets, interlocking magnets and iron blocks can be used.

[0106] On the underside of the trolley case, there are two spaced-apart pockets or recesses 86. As can be seen, the wheels 24 attached to one three-point star hub 26 are horizontally spaced from the wheels 24 attached to the other three-point star hub 26. The centers of the two recesses 86 are horizontally spaced from each other by exactly the same distance as the centers of the two three-point star hubs 26.

[0107] Fig. Figure 13 shows that the two lower wheels 24, attached to both three-pointed star hubs 26, are touching the ground. However, the third wheel on both of these three-pointed star hubs 26 is located above them.

[0108] When the open frame 56 is retracted, one of the wheels 24 mounted on the three-point star hub 26 located near the open frame 56 can enter each of the recesses 86. The wheels 24 located in the recesses 86 can be referred to as the upper wheels.

[0109] These recesses 86 are different from the wheel wells of a typical vehicle. A vehicle wheel rotates within its wheel well; however, the recess or pocket 86 is not designed to allow the wheel 24 of the trolley case to rotate within it.

[0110] When the upper wheels 24, which are attached to the three-pointed star hubs 26, are located in the pockets or recesses 86, the three-pointed star hubs 26 cannot rotate. This position is ideal for pulling the trolley on a flat surface 100. In this case, the wheels of the two three-wheel star assemblies that are not located in the recesses allow the trolley to remain stationary in a vertical orientation, or to be moved vertically on four wheels (two wheels each of two three-wheel star assemblies), or to be moved tilted on two wheels (one wheel each of two three-wheel star assemblies).

[0111] It's possible that the wheel pockets (recesses) don't fully accommodate the wheels; they might only be deep enough to prevent the rotation of the tricycle star assembly. This embodiment incorporates most of the features of the present invention.

[0112] Pockets or depressions may be present in designs similar to those shown in Fig. 11 and Fig. 12. However, the position of these depressions would not be exactly similar to the position shown here.

[0113] Fig. Figure 15 shows another embodiment. It is a side view. This embodiment has two independent rods 58 at the bottom of both long sides of the trolley case. Each of the rods 58 has a wheel 20 at the free end. These rods with wheels 20 can slide or move in the channels or tracks 66. These slidably movable rods 58 can be extended from the bottom of the trolley case and retracted completely within the confines of the case. Fig.The sliding rods 58 shown in Figure 15 are in the extended position, and therefore the wheels 20 are further away from the body 80. This condition is ideal for pulling the trolley case up stairs and on level ground.

[0114] The advantage of using two independent sliding bars instead of a sliding open frame is that the wheels can easily be fully retracted within the confines of the trolley without requiring a recess or indentation for the center panel. This makes it easier to store the trolley in more confined spaces. However, a sliding open frame can also be used, as in most other embodiments. Any of the locking arrangements used in other (previously mentioned) embodiments, or any other type, can be used in this embodiment.

[0115] There may be three locking positions instead of the two locking positions of other embodiments. In the innermost locking position, the wheels 20 are fully retracted within the confines of the suitcase, which is ideal for stowing the suitcase. In the extremely extended position, the wheels 20 are furthest from the body, which helps provide clearance for the edges of the stairs. Therefore, locking in this extended position is useful when pulling the suitcase along stairs, particularly upstairs. There may be a locking position between the fully retracted and fully extended positions. Thus, locking in this intermediate position allows the suitcase to be easily pulled along flat surfaces. QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] US 6612411 B2

[0006] US 7861834 B2

[0006] US 5306027

[0007] US 7669862 B2

[0012] US 6938740

[0013]

Claims

[1] An arrangement for positioning wheels which can be attached to or incorporated into a movable object to enable it to be moved up or down stairs and to move more easily over flat surfaces, comprising: an open frame with three sides, the central part of which serves as an axis and is connected to two parallel sides; two parallel tubes or channels surrounding and supporting the two parallel sides of the open frame, allowing the open frame to be extended from and retracted into the main body of the movable object; one or more wheels or one or more multi-wheel star arrangements mounted on the centerpiece of the open frame; and mechanical locking parts, such as notch and plunger, pin and hole, etc., or magnets and iron bands embedded in the open frame and surrounding tubes to lock them either in the extended position to allow the object to be moved up or down stairs, or in the retracted position to allow movement over flat surfaces and easier storage of the object. [2] An arrangement for positioning wheels which can be attached to or incorporated into a movable object to enable it to be moved up or down stairs and to move more easily over flat surfaces, comprising: one or more bars or rods, each having a small stub axle or tenon axle fixed at right angles to its free end; one or more parallel tubes or channels surrounding or supporting the rod(s) or bars and enabling them to be extended from and retracted into the main body of the movable object; one or more wheels or one or more multi-wheel star arrangements mounted on each of the one or more stub or pin axles; and mechanical locking parts, such as notch and plunger, pin and hole, etc., or magnets and iron bands embedded in the rod(s) or bar(s) and the respective surrounding tube(s) to lock them either in the extended position to enable the object to be moved up or down stairs, or in the retracted position to enable movement over flat surfaces and easier storage of the object. [3] An arrangement for positioning wheels which can be attached to or incorporated into a movable object to enable it to be moved up or down stairs and more easily over flat surfaces, comprising: two rods, each having a small stub or pivot axis fixed at right angles to that end of the rod which is remote from the body of the movable object; a pivot point to which a rod is attached to one side of the movable object and another pivot point to which another rod is attached to the opposite side of the movable object, thereby enabling the rods to pivot relative to the body of the movable object; a wheel or multi-wheel star arrangement mounted on each stub or journal axle; and mechanical locking members or magnets and iron bands embedded in the bars and sides of the movable article to lock the bars or poles in two different positions, one position for facilitating ascending or descending stairs of the article and a second position for moving the article over flat surfaces and for more effortless stowing of the article. [4] An arrangement for positioning wheels which can be attached to or incorporated into a movable object to enable it to be moved up or down stairs and more easily over flat surfaces, comprising: an open frame with three sides, the central part of which serves as an axis and is connected to two parallel sides; a pivot point to which one side of the open frame is attached to one side of the movable object, and another pivot point to which another side of the open frame is attached to the other side of the movable object, thereby enabling pivoting of the open frame with respect to the body of the movable object; one or more wheels or one or more multi-wheel star arrangements mounted on the centerpiece of the open frame; and mechanical locking members or magnets and iron bands embedded in the sides of the open frame and in the sides of the movable article to lock the open frame in at least two different positions relative to the body of the movable article, one position being for facilitating ascending or descending stairs of the article and a second position being for moving the article over flat surfaces and for more effortless stowing of the article. [5] A pocket or recess in the main body of a movable object having one or more tricycle star assemblies for receiving one of the wheels of a tricycle star assembly when that tricycle star assembly is retracted close to the body to prevent rotation of that tricycle star assembly. [6] Extendable and retractable handle frame for movable objects, which is locked in the extended position using magnets and is mechanically locked in the retracted position. [7] An arrangement similar to those recited in any one of claims 1, 2, 3 or 4, wherein electromechanical or electromagnetic locking mechanisms are used instead of mechanical or magnetic locking mechanisms.

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