Plug-in wheel arrangement

Description

[0001] The present invention relates to a pluggable wheel assembly, preferably for use in a rollator, with the features of claim 1. When the invention is used in a rollator, the individual wheels can be repositioned so that the track width of the rollator can be changed. This allows the driving characteristics to be adapted to the environment in which the rollator is to be used. background

[0002] The use of walking aids in the form of rollators is intended to support people who would otherwise find walking difficult. They offer these individuals secure support and can also be pushed along while walking. A particularly stable rollator is always essential, as otherwise falls and potentially serious injuries can result. A stable base must be guaranteed, especially outdoors and on uneven terrain. For this reason, a wide track width is often chosen to prevent tipping sideways. However, in very level environments, such as indoors, a rollator can be narrower, as it does not need to be designed for rough terrain to be maneuverable safely. State of the art

[0003] There are rollators designed exclusively for indoor use, which therefore have a narrower track width than those intended for outdoor use. These are also called indoor rollators. Indoor rollators are only safe on very level surfaces. Their width is dimensioned to allow them to be easily maneuvered indoors without bumping into obstacles such as doors, furniture, or walls. The narrow design offers the advantage of high maneuverability, allowing them to be pushed through narrow gaps. However, a disadvantage is the narrow handle width, which reduces the user's grip. Furthermore, the narrow design reduces stability and the risk of tipping. Indoor rollators are completely unsuitable for outdoor use and pose a significant risk of falls for the user.

[0004] To navigate uneven terrain outdoors, there are rollators specifically designed for such conditions, featuring a wider track width than indoor rollators. These are also known as outdoor rollators. The wider track provides greater stability and support, offering improved stability compared to indoor rollators. It also allows for a wider handlebar, providing a better grip. However, the wider design reduces handling and maneuverability. These rollators are completely unsuitable for indoor use. Users would find it more difficult to navigate doorways and would frequently encounter obstacles, as outdoor rollators are wider than indoor models, typically because the rear wheels are positioned on the outside.It is usually not possible to replace or reposition the front wheels on rollators.

[0005] If people rely on rollators and want to use one both indoors and outdoors, they have no choice but to use a separate rollator for indoor and outdoor use. This takes up space and is also expensive to purchase. Furthermore, statutory health insurance only covers the cheapest suitable rollator or sometimes only a portion of the cost, resulting in a significant out-of-pocket expense.

[0006] When extending the considered state of the art with regard to wheel arrangements, the following patent specifications should be mentioned.

[0007] German patent DE 1 865 003 U discloses a stroller wheel with axle stub and mudguard as a removable unit. The wheel is mounted to the stroller frame using a movable rivet connection and a U-shaped bent flat iron bar.

[0008] From DE 10 2016 118 032 A1, a drive unit and a wheelchair with a drive unit are known, wherein the mounting of the large wheelchair wheel to a drive unit and thus to the wheelchair itself is shown. A shaft-hub connection is used to connect the output shaft of the drive unit to the drive axle of the mounted wheel.

[0009] German patent DE 20 308 860 U1 discloses a method of assembling a wheel unit for a stroller. This stroller is designed to allow steering movements using the front wheels. The wheel unit, consisting of a wheel and an axle coupled to the wheel, is mounted into a wheel seat unit.

[0010] US 2021 / 0228433 A1 discloses a rollator designed to assist a user's mobility. The rollator features a foldable frame that can be folded compactly, wheels mounted on the frame, brakes for slowing the wheels, and handgrips attached to the frame. The handgrips must be moved into a sliding position to activate the brakes. The rollator may also include a seat with two positions: a seated position and a folded-up position. Applying a force to the seat equal to or greater than a defined seat pressure threshold is required to activate the brakes. Task

[0011] The object of the present invention is to provide a pluggable wheel assembly, for example for a rollator. Such a pluggable wheel assembly makes it possible, for example in the case of a rollator, to increase or decrease the track width by allowing the wheels to be mounted, in particular plugged in, on both sides of a profile strip, for example of the rollator. Solution

[0012] The problem is solved by the technical features specified in claim 1.

[0013] A pluggable wheel assembly is provided. The pluggable wheel assembly comprises at least one wheel, at least one profile strip, at least one plug-in axle, and at least one locking unit, wherein the at least one wheel is designed to be connectable to the at least one plug-in axle. The at least one profile strip has at least one through-opening perpendicular to the lateral surface and / or surface of the at least one profile strip. The at least one plug-in axle is designed to be inserted through the at least one through-opening of the at least one profile strip, wherein the at least one plug-in axle can be locked to the at least one profile strip from either side of the at least one profile strip.The at least one profile strip has at least one curvature, wherein the at least one curvature is formed to project inwards and / or outwards from the surface of the at least one profile strip, wherein the curvature is formed concentrically to the passage opening.

[0014] The indication of the number with "at least one" means either the use of exactly one element, or two elements, or three elements, or four elements, or five elements, or any other integer number of elements.

[0015] Lockable from either side of the at least one profile strip means that the at least one axle can be inserted and locked into the at least one profile strip from both sides. The same applies to the at least one wheel that can be connected to the at least one axle.

[0016] Advantageously, a rollator can be designed from four pluggable wheel assemblies according to the invention, wherein the corresponding wheel assemblies are designed according to claim 1. At least two pluggable wheel assemblies according to the invention are arranged essentially in pairs next to each other. The pairs thus formed can be arranged one behind the other or next to each other.

[0017] Advantageously, the pluggable wheel assemblies according to the invention can be designed to be connectable to one another by means of profile strips. Connections using, for example, steel cables or similar connecting elements are also possible.

[0018] Advantageously, at least one pluggable wheel assembly according to the invention can be arranged on at least one further pluggable wheel assembly according to the invention. Combinations of at least two pluggable wheel assemblies according to the invention arranged next to each other can be arranged essentially side by side or one behind the other. The combinations thus formed can be arranged one behind the other or side by side.

[0019] Advantageously, a rollator can be designed with at least two pluggable wheel assemblies according to the invention. The at least two pluggable wheel assemblies according to the invention are essentially arranged side by side in pairs. The rollator has a combination of at least two further wheel assemblies that already have a smaller track width to enable indoor use. The track width is always defined as the distance between at least two wheels. Whether the track width is increased or decreased depends on which side of the at least one profile strip the at least one wheel is plugged into. If the at least one wheel is arranged in the first pluggable position, also called the outer position, the track width is increased. If the at least one wheel is arranged in the second pluggable position, also called the inner position, the track width is decreased.

[0020] Advantageously, at least one wheel can be arranged or connected to a free end of at least one profile strip. This at least one wheel is also advantageously rotatable in both directions of travel. Thus, the wheel assembly with the at least one wheel can be moved forwards and backwards. The wheel forms a freewheel.

[0021] The at least one wheel can be arranged or connected to a free end of the at least one axle. If the at least one wheel is connected to the at least one axle, then the at least one wheel and the at least one axle are advantageously rotatably connected to each other, so that no rotational movement can be transmitted from one component to the other, i.e., from the wheel to the axle and vice versa.

[0022] Advantageously, at least one wheel can be connected to at least one axle via at least one bearing. The at least one bearing can be a ball bearing. The possibility of plugging the at least one axle, with or without the at least one wheel, to the at least one profile strip allows for quick and easy mounting of the axle, with or without the at least one wheel. This allows, for example, quick and easy replacement or repositioning. The at least one locking unit holds the axle in position on the profile strip after plugging it in.

[0023] Advantageously, the inner diameter of at least one bearing is designed to be almost identical to the outer diameter of the stub shaft. A corresponding fit is formed, which can be either a clearance fit or an interference fit. Whether a clearance or interference fit is present depends on the ratio of the inner diameter of the bearing to the outer diameter of the stub shaft; the precise relationships are known to those skilled in the art and are therefore not explained in detail here.

[0024] Advantageously, at least one of the curves can be designed as a raised section. The internal shape of this curve follows the shape of the at least one through-opening. This allows for better force distribution on the at least one axle, which is designed to pass through the at least one through-opening, due to the larger contact area. Additionally, the at least one axle can be longer. Furthermore, the at least one axle can be designed such that it does not project laterally beyond the curve on either side of the at least one profile strip. This also allows for protected mounting of the at least one axle within the at least one profile strip.

[0025] Advantageously, at least one of the curves can be designed as a recess. The internal shape of this at least one curve follows the shape of the at least one through-opening. This allows for better force distribution on the at least one axle, which is designed to pass through the at least one through-opening, due to the larger contact area. Additionally, the at least one axle can be shorter. Furthermore, the at least one axle can be designed such that it does not protrude laterally beyond the at least one profile strip. This also allows for protected mounting of the at least one axle within the at least one profile strip.

[0026] It must be ensured that the at least one axle can be inserted through the at least one through-hole and the at least one bulge. Furthermore, no problems may arise due to the chosen shapes of the at least one through-hole and the at least one axle, such as those that could occur, for example, when mounting the at least one wheel onto the at least one axle.

[0027] Advantageously, the outer shape of the at least one bulge can be circular, oval, polygonal, or star-shaped. Advantageously, the outer shape of the at least one bulge is formed as a combination of at least one sub-shape, wherein the at least one sub-shape can be circular, oval, polygonal, or star-shaped.

[0028] Advantageously, at least one profile strip can be circular, oval, elliptical, polygonal, or star-shaped; more advantageously, it can be circular, oval, elliptical, or polygonal.

[0029] The profile strip can be advantageously made of plastic, fiber-reinforced plastic, metal, or carbon.

[0030] It is advantageous for at least one profile strip to be designed as a profile tube.

[0031] Advantageously, at least one profile strip can have at least one guide groove on at least one side. Advantageously, the at least one guide groove can be designed as a slide-on guide. At least one protective cover or protective profile can be mounted using the at least one guide groove.

[0032] It is advantageous for at least one wheel to have a variable size. If several wheels are present, then at least adjacent wheels are essentially the same size.

[0033] It is advantageous for at least one wheel to have a variable profile. If several wheels are present, then at least adjacent wheels will have essentially the same profile.

[0034] In a further advantageous embodiment of the invention, the at least one connecting axis can be circular or oval or elliptical or polygonal or star-shaped, more advantageously circular or oval or elliptical or polygonal.

[0035] It is advantageous that at least one axle in the wheel area is circular in shape. This allows for easy mounting of the bearings and the application of an external thread.

[0036] Furthermore, it is advantageous to form the through-opening by means of a die punched or cut, for example with a laser or water jet cutting device, or by drilling and / or subsequently deburring.

[0037] Advantageously, at least one of the openings can be circular, oval, elliptical, polygonal, or star-shaped.

[0038] Advantageously, the shapes of at least one stub axle and at least one through-hole are identical.

[0039] Advantageously, the dimensions of the cross-sections of the at least one insertion axis and the at least one through-opening have similar values. The cross-section of the at least one insertion axis corresponds to the surface that is arranged perpendicular to the longitudinal direction of the insertion axis.

[0040] Even more advantageously, the dimensions of the cross-sections of the at least one stub shaft and the at least one through-hole form a clearance fit. This means that the diameter of the at least one through-hole is large enough to allow the at least one stub shaft to be inserted through it. The outer diameter of the at least one stub shaft corresponds essentially to the diameter of the at least one through-hole, where "essentially" means that a tolerance is provided between them, as is customary for dimensioning clearance fits. In this case, this tolerance can range from a few hundredths of a millimeter to tenths of a millimeter, depending on the size of the outer diameter of the stub shaft.

[0041] Advantageous further training opportunities can be found in the sub-requirements.

[0042] In an advantageous embodiment of the invention according to claim 2, at least one curvature is arranged on the at least one profile strip on each side of the at least one through-opening of the at least one profile strip. This allows the at least one insertion shaft to be inserted into the at least one profile strip and the at least one curvature from both sides of the at least one profile strip in such a way that the at least one insertion shaft does not project laterally beyond the at least one profile strip and / or the at least one curvature.

[0043] In an advantageous embodiment of the invention according to claim 3, it is provided that the at least one wheel with the at least one axle can be inserted from each side of the profile strip into the at least one through-opening of the at least one profile strip and / or the at least one bulge, thereby allowing the at least one wheel to be placed in a first insertion position and a second insertion position. The first insertion position, also called the outer position, is characterized in that the at least one wheel is arranged on the outside of the at least one profile strip. The second insertion position, also called the inner position, is characterized in that the at least one wheel is arranged on the inside of the at least one profile strip.

[0044] In an advantageous embodiment of the invention according to claim 4, it is provided that a change in track width can be effected by moving the at least one wheel from a first plug-in position to a second plug-in position and / or vice versa, and / or at least one stop is arranged on the side of the at least one plug-in axle facing the at least one wheel, wherein the at least one stop distances the at least one wheel from the at least one curvature and / or the at least one profile strip, and / or the at least one stop is designed such that the at least one plug-in axle does not project laterally beyond the profile strip and / or curvature in any plug-in position.

[0045] The first insertion position, also called the outer position, is characterized in that the at least one wheel is arranged on the outside of the at least one profile strip. The second insertion position, also called the inner position, is characterized in that the at least one wheel is arranged on the inside of the at least one profile strip.

[0046] If the wheels on both sides of a rollator are rotated approximately 180° in their mounting position, for example, from an inner to an outer position, the distance between the wheels is increased by approximately 180 mm. This is referred to as an increase in track width of approximately 180 mm, which significantly improves the stability and security of the rollator, making it suitable for outdoor use.

[0047] When the wheels are moved to an inward position, the overall track width is reduced by approximately 180 mm, significantly facilitating use in confined spaces. Simultaneously, the wheels, due to their inward position, cannot snag on door or furniture edges, for example. In the event of a collision with an obstacle, only the profile tubes touch the protective strip, thus cushioning and dissipating the impact. This further enhances the rollator's safety indoors.

[0048] Advantageously, at least one stop, which is arranged on the axle, is permanently or, even more advantageously, removablely connected to the axle. If the at least one stop, for example in the form of a spacer bushing, is removablely connected to the at least one axle, i.e., screwed, plugged, or pressed in, it can be replaced at any time without significant effort or expense in the event of failure or wear. Similarly, in the event of failure or wear, the at least one axle can be replaced at any time without significant effort or expense.

[0049] The advantage of this is that the at least one stop is arranged on the side of the at least one axle facing the at least one wheel, and the at least one stop separates the at least one wheel from the at least one curve and / or the at least one profile strip, ensuring that the at least one wheel can always be mounted in such a way that free rotation of the at least one wheel is guaranteed. This means that the spacing ensures that the movement of the at least one wheel is not impaired by other components of the wheel assembly. A possible braking device is excluded from this.

[0050] Depending on the length of the at least one stub axle and the positioning of the at least one stop on the at least one stub axle, it can be designed in such a way that the at least one stub axle does not protrude laterally beyond the at least one profile strip and the at least one curve.

[0051] Advantageously, at least one stop is arranged on the at least one axle. It is particularly advantageous if the at least one stop is arranged on the side of the at least one axle facing the at least one wheel. With the aid of the at least one stop, the at least one wheel can be kept apart from the at least one curve and / or the at least one profile strip. This ensures free rotation of the at least one wheel.

[0052] Advantageously, at least one stop can be designed as a spacer bushing or spacer sleeve.

[0053] Advantageously, at least one stop, for example in the form of a spacer bushing, is designed to be releasable by an operator. Releasing the stop can advantageously be achieved, for example, by integrating a release unit. This release unit can be designed, for example, as a spring-loaded button and / or a push button. Furthermore, the release unit can, for example, be located on the wheel side.

[0054] Advantageously, the stop is at least partially polygonal, elliptical, circular, or star-shaped in its cross-section.

[0055] Advantageous is the at least one stop, for example in the form of a spacer bushing, which is arranged on the side of the at least one profile strip facing away from the at least one wheel and is designed to be slid onto the at least one curvature in a form-fitting manner.

[0056] Advantageously, the at least one stop, for example in the form of a spacer bushing, which is arranged on the side of the at least one profile strip facing away from the at least one wheel, has at least one recess with which the outer cylindrical surface of the at least one curvature forms a clearance fit.

[0057] Advantageously, at least one stop in the inserted form of the at least one plug-in axle rests against the lateral surface of the at least one profile strip.

[0058] Advantageously, at least one stop, for example in the form of a spacer sleeve, can be positively fitted onto at least one curve. This also ensures that the at least one stop does not produce any rattling or other disturbing noise during use of the at least one pluggable wheel assembly.

[0059] The connection between the at least one curve and the at least one stop is advantageously designed as a clearance fit. This allows for the compensation of minor manufacturing tolerances of the at least one stop or the at least one curve. This is particularly beneficial when replacing the at least one stop due to wear or damage, for example, as it saves costs and manufacturing effort.

[0060] In a further advantageous embodiment of the invention, it is provided that at least one wheel can be mounted on the at least one axle between the at least one stop, which can be designed as a spacer bushing, and the at least one clamping ring on the bearing surfaces of the at least two bearings, taking into account longitudinal play, by means of at least one clamping ring.

[0061] Advantageously, an external thread is formed at the outer end of the at least one axle on the side facing the at least one wheel. This external thread advantageously has a diameter matching the internal thread of the at least one clamping ring. This ensures secure mounting of the at least one wheel onto the at least one axle.

[0062] Advantageously, the longitudinal play of the at least one wheel on the at least one stub axle, which is placed between the at least one stop and the at least one clamping ring, can be designed to be adjustable by placing the at least one clamping ring on the external thread of the at least stub axle.

[0063] Advantageously, the at least one wheel is designed to be mounted on the at least one axle between the at least one profile tube, more advantageously between the at least one curvature and the at least one clamping ring on the bearing surfaces of, for example, the at least two bearings, taking into account longitudinal play, with at least one clamping ring.

[0064] Advantageously, the longitudinal play of the at least one wheel on the at least one stub axle, which is placed between the at least one profile tube, more advantageously the at least one curvature and the at least one clamping ring, can be designed to be adjustable by placing the at least one clamping ring on the external thread of the at least stub axle.

[0065] Advantageously, at least one clamping ring can be designed as a hexagonal nut.

[0066] In an advantageous embodiment of the invention according to claim 5, it is provided that the at least one profile strip is designed as a profile tube or as a rod filled with a grid.

[0067] Advantageously, at least one profile tube and / or at least one rod filled with a grid is circular, oval, elliptical, polygonal, or star-shaped; more advantageously, it is circular, oval, elliptical, or polygonal.

[0068] Advantageously, the grid with which the at least one rod filled with a grid is formed has a polygonal, elliptical, circular, or star-shaped cross-section. Further advantageously, the grid with which the at least one rod filled with a grid is formed has a three-dimensional lattice structure, such as a Weaire-Phelan or honeycomb structure. This is not to be understood as a limitation, since other three-dimensional lattice structures known to those skilled in the art can also be used.

[0069] In an advantageous embodiment of the invention according to claim 6, it is provided that the at least one curvature and the at least one locking unit form a locking mechanism and / or are designed as a locking module.

[0070] The design of the locking mechanism and / or locking module, incorporating at least one bulge and at least one locking unit, ensures particularly good handling and facilitates the replacement of individual components. For example, if the locking unit becomes worn, it can be replaced without having to replace the entire locking mechanism and / or locking module. This is sustainable and saves costs.

[0071] Advantageously, at least one locking unit can be designed in the form of at least one spring button and / or at least one push button or at least one retaining clip or at least one combination of a spring and a pin or other spring-based or spring-like devices known to the skilled person.

[0072] In an advantageous embodiment of the invention according to claim 7, the at least one locking unit is arranged on the side of the axle facing away from the wheel. The at least one locking unit is located at a free end of the at least one axle. Thus, the at least one axle, with the side on which the at least one locking unit is arranged, can be inserted through the at least one through-opening of the at least one profile strip and the at least one bulge.Depending on the length of the at least one plug-in axle and the positioning of the at least one locking unit on the at least one plug-in axle, the at least one locking module consisting of the at least one locking unit and the at least one profile strip, or more advantageously the at least one curvature, can be designed such that the at least one plug-in axle does not project laterally beyond the at least one profile strip and / or the at least one curvature.

[0073] In an advantageous embodiment of the invention according to claim 8, it is provided that the at least one curvature on each side of the at least one profile strip forms at least one circumferential annular groove in the interior of the at least one profile strip corresponding to the shape of the at least one locking unit and / or the at least one curvature on each side of the at least one profile strip has at least one circumferential annular groove in the inner and / or outer lateral surface of the at least one curvature corresponding to the shape of the at least one locking unit.

[0074] If the at least one bulge on each side of the at least one profile strip forms at least one circumferential annular groove inside the profile strip, corresponding to the shape of the at least one locking unit, the at least one locking mechanism and / or the at least one locking module, consisting of the at least one bulge and the at least one locking unit, can be designed to be invisibly concealed and / or protected from dirt by placing the at least one locking mechanism within the profile strip. The circumferential annular groove corresponds to an annular cavity between the two bulges.

[0075] Advantageously, the at least one curve on each side of the at least one profile strip has at least one circumferential annular groove in the inner and / or outer surface of the curve, corresponding to the shape of the at least one locking unit. This means that the at least one locking mechanism and / or the at least one locking module, consisting of the at least one curve and the at least one locking unit, is not visible and / or protected from dirt by placing the at least one locking mechanism within the at least one curve or the at least one profile strip.

[0076] In the aforementioned advantageous embodiments of the at least one locking device and / or the at least one locking module, the outer dimension of the at least one locking unit corresponds essentially to the dimensions of the at least one annular groove, where "essentially" means that a tolerance is provided between them, as is customary for dimensioning clearance fits. In this case, this tolerance can range from a few hundredths of a millimeter to tenths of a millimeter, depending on the size of the outer dimension of the locking unit. Thus,

[0077] Manufacturing deviations can be easily compensated for.

[0078] In an advantageous embodiment of the invention according to claim 9, it is provided that the at least one locking unit is designed to be inserted and / or fitted into the at least one profile strip and / or that the at least one locking unit is designed to be connectable to the at least one release unit via at least one connecting element and / or that the at least one locking unit together with the at least one connecting element and the at least one release unit are designed to form at least one locking mechanism and / or as at least one locking module and / or that the at least one release unit has at least one through-hole, wherein the at least one through-hole is designed as a double hole with two different diameters.

[0079] The shape of the at least one locking unit corresponds in its longitudinal extent to the shape of the inner recess of the at least one profile strip in its longitudinal extent. Advantageously, a fit is thus formed. A clearance fit is particularly advantageous. This allows the at least one locking unit to be moved as easily as possible within the at least one profile strip.

[0080] The at least one connecting element is advantageously designed as a spring element. For example, the spring element can be designed as a spiral spring or a helical spring. Advantageously, the at least one connecting element allows the at least one release unit to move relative to the at least one locking unit along the longitudinal extent of the at least one profile strip. Particularly advantageously, the at least one connecting element moves the at least one release unit from a first sliding position, also called the unlocking position, to a second position, also called the locking position. The movement of the at least one release unit to the second sliding position is particularly advantageously automatic. The at least one locking mechanism and / or the at least one locking module, consisting of at least one locking unit, at least one connecting element, and at least one release unit, is therefore self-locking.

[0081] The larger diameter of the double bore is advantageously designed to allow the drive shaft to be inserted through it. The smaller diameter, on the other hand, is advantageously dimensioned to prevent the drive shaft from being inserted through. The different diameters of the double bores overlap in such a way that the smaller bore, at its widest point (which also corresponds to the smaller diameter), transitions into the larger bore with the larger diameter.

[0082] In an advantageous embodiment of the invention according to claim 10, it is provided that the at least one plug-in axle has a circumferential annular groove.

[0083] In a further advantageous embodiment, the at least one plug-in shaft has an annular groove on both sides along its longitudinal extent, so that the at least one plug-in shaft has a total of two annular grooves.

[0084] Advantageously, the diameter of the lateral surface of the at least one annular groove is smaller than the outer diameter of the at least one stub axle.

[0085] The at least one annular groove serves to fix the at least one plug-in axle with the aid of the at least one release unit and the at least one through-hole of the at least one profile strip. The at least one double bore of the at least one release unit is used to hold the at least one plug-in axle in position perpendicular to the lateral surface and / or surface of the at least one profile strip. Advantageously, a fit is formed between the first or smaller diameter of the at least one double bore and the lateral surface of the at least one annular groove of the at least one plug-in axle. Even more advantageously, a clearance fit is formed.

[0086] Advantageously, the outer diameter of at least one stub axle and at least one through-hole of at least one profile strip also form a fit. Again, it is advantageous if a clearance fit is formed.

[0087] Advantageously, the tolerances of both described clearance fits are a few hundredths to tenths of a millimeter, depending on the size of the outer dimension of the at least one annular groove and / or the outer diameter of the at least one stub axle. This allows manufacturing deviations to be easily compensated for.

[0088] Advantageously, the annular groove has a rectangular rotational profile, wherein the rectangular rotational profile is rotated about the axis of rotation, which runs along the longitudinal extent of the plug axis. Alternatively, however, it is also conceivable that the annular groove has a round, in particular a semicircular or U-shaped, or a V-shaped rotational profile.

[0089] In an advantageous embodiment of the invention according to claim 11, it is provided that a first and a second diameter are provided in the at least one double bore, wherein the first diameter corresponds to the outer diameter of the at least one annular groove of the at least one stub axle and the second diameter corresponds to the outer diameter of the at least one stub axle such that the diameters of the double bore and the respective outer diameters of the at least one annular groove and the at least one stub axle are each designed as a fit.

[0090] This means that the first diameter is large enough to allow the axle to be inserted. The second diameter essentially corresponds to the outer diameter of the axle, with "essentially" meaning that a tolerance is provided between them, as is standard practice for dimensioning clearance fits. In this case, this tolerance can range from a few hundredths of a millimeter to tenths of a millimeter, depending on the size of the axle's outer diameter. The same applies to the ratio between the first diameter and the outer diameter of the annular groove. The bore in the at least one profile tube also forms a clearance fit with the axle's outer diameter.

[0091] In an advantageous embodiment of the invention according to claim 12, the at least one release unit has at least one recess on each side, the shape of which follows the shape of the at least one double bore. This avoids sharp edges. Furthermore, it facilitates the engagement of the at least one plug-in axle in the at least one double bore of the at least one release unit.

[0092] In an advantageous embodiment of the invention according to claim 13, it is provided that the at least one profile strip and the at least one locking unit have at least one further through-opening, wherein at least one retaining element is designed to be inserted through the at least one further through-opening of the at least one profile strip and the at least one locking unit.

[0093] It is advantageous if at least one additional through-opening is circular, oval, elliptical, polygonal, or star-shaped.

[0094] Advantageously, the at least one holding unit is circular, oval, elliptical, polygonal, or star-shaped. It is particularly advantageous if the at least one holding unit is shaped identically to the at least one other through-opening. This allows the at least one holding unit to be inserted through the at least one other through-opening.

[0095] Advantageously, at least one holding unit and at least one other through-hole form a fit.

[0096] A press fit is particularly advantageous in this design. This secures the at least one holding unit to the at least one profile strip and the at least one locking unit. Furthermore, no additional element is required to hold the at least one locking unit in position. It is particularly advantageous that the at least one holding unit is designed with a length such that it does not protrude laterally beyond the at least one profile strip.

[0097] A clearance fit is particularly advantageous. This secures at least one retaining unit to at least one profile strip and at least one locking unit. However, fastening the at least one retaining unit is also possible. This fastening can be, for example, a retaining ring, snap ring, or locking bar. However, at least one ring groove or eyelet is required for this. Furthermore, the at least one retaining unit projects laterally beyond the at least one profile strip.

[0098] In an advantageous embodiment of the invention according to claim 14, the at least one locking mechanism and / or the at least one locking module, which is arranged on the plug-in shaft, is designed to be self-locking. Self-locking here means that the locking module can be moved from a released to a locked or latched state without the intervention of an operator.

[0099] It is advantageous if at least one locking module is designed to be releasable by an operator. Releasing the locking module can advantageously be achieved, for example, by integrating a push button. This push button can, for example, be located on the wheel side.

[0100] Furthermore, a rollator with at least one pluggable wheel arrangement according to claim 1 is provided, wherein a track width change of the rollator can be effected by at least one pluggable wheel arrangement.

[0101] Advantageously, a rollator can be designed with at least two pluggable wheel assemblies according to the invention. The at least two pluggable wheel assemblies according to the invention are essentially arranged side by side in pairs. The rollator has a combination of at least one further wheel assemblies to enable indoor use. The track width is always defined as the distance between at least two wheels. Whether the track width is increased or decreased depends on which side of the at least one profile strip the at least one wheel is plugged into. If the at least one wheel is arranged in the first pluggable position, also called the outer position, the track width is increased. If the at least one wheel is arranged in the second pluggable position, also called the inner position, the track width is decreased.

[0102] Advantageously, at least two pluggable wheel assemblies are provided, arranged opposite each other. The wheels of the opposing pluggable wheel assemblies define the track width of the rollator, whereby the track width is always defined as the distance between at least two wheels.

[0103] If the mounting position of at least one wheel is changed, the track width is simultaneously altered. The at least one wheel is moved either from the inside to the outside or vice versa by changing its mounting position. Therefore, with a symmetrical change in the mounting position of at least two wheels, at least the two wheels are positioned either on the outside or the inside of the rollator.

[0104] Rollators designed for outdoor use have a wide track width for stability and security. In contrast, rollators intended for indoor use have a narrower track width for comfortable maneuverability. In these cases, the wheels are positioned more towards the inside, resulting in a narrower track width. For outdoor use, the wheels are positioned further outwards to provide a wider track width.

[0105] In an advantageous embodiment, with a pluggable wheel arrangement, the distance between the wheel center and the center of at least one profile tube is 45 mm, so that when the at least one wheel is moved or repositioned by 180°, a displacement of 90 mm occurs relative to the wheel center. If the wheels on both sides of a rollator are moved or repositioned by 180° in their pluggable position, for example, from an inner position to an outer position, the distance between the wheels is increased by a total of 180 mm. This is referred to as an increase in track width of 180 mm, which enables a significantly more stable and secure stand for the rollator, allowing it to be used outdoors.

[0106] When the wheels are moved to an inward position, the overall track width is reduced by 180 mm, significantly improving maneuverability in confined spaces. At the same time, the wheels' inward position prevents them from catching on door or furniture edges, for example. In the event of a collision, only the profile tubes touch the protective strip, thus cushioning and dissipating the impact. This further enhances the rollator's safety indoors.

[0107] Advantageously, at least one brake unit is arranged on at least one retaining sleeve, wherein the at least one retaining sleeve is arranged on the at least one profile strip and / or the at least one brake unit is rotatable about the axial axis of rotation of the at least one profile strip, wherein the at least one retaining sleeve is designed as a further locking unit and / or the at least one brake unit has at least one brake sleeve with at least one brake shoe arranged thereon and / or the at least one brake sleeve is displaceable by means of a tensile force via at least one brake line, wherein the at least one brake line is designed as a Bowden cable and comprises at least one core and at least one sheath.

[0108] The at least one brake unit can be designed with multiple parts. The at least one wheel can be braked by the at least one brake unit. This means that the rotation of the at least one wheel can advantageously be reduced to a standstill.

[0109] Advantageously, at least one brake unit is formed on at least one profile strip of at least two opposing pluggable wheel arrangements according to the invention.

[0110] Advantageously, the inner shape of the at least one retaining sleeve is adapted to the outer shape of the at least one profile strip. This allows the at least one retaining sleeve to be mounted onto the at least one profile strip.

[0111] It is advantageous that at least one brake unit is shorter in its longitudinal extent compared to at least one retaining sleeve.

[0112] Advantageously, the inner shape of the at least one brake unit is designed to fit the outer shape of the at least one retaining sleeve in a form-fitting manner.

[0113] It is advantageous that at least one retaining sleeve is designed to slide onto at least one profile strip. This ensures the simplest possible installation.

[0114] Advantageously, at least one brake unit can be slid onto at least one retaining sleeve. This allows for easy installation of at least one brake unit.

[0115] It is advantageous that at least one brake unit can be mounted on at least one retaining sleeve without tools.

[0116] Advantageously, the at least one profile strip has at least one further through-opening, wherein at least one retaining pin can be inserted through the at least one further through-opening. The at least one retaining pin is designed as a holder for the at least one retaining sleeve on the at least one profile strip.

[0117] Advantageously, at least one retaining pin can be circular, oval, elliptical, polygonal, or star-shaped.

[0118] It is advantageous for at least one retaining pin to also be designed as a retaining bolt.

[0119] The axial axis of rotation of the at least one profile strip is formed as the intersection axis of the at least two axes of symmetry of the at least one profile strip in the longitudinal extension of the at least one profile strip.

[0120] Advantageously, the outer shape of at least one retaining cuff may be circular, oval, elliptical, polygonal, or star-shaped.

[0121] Advantageously, the external shape of the at least one retaining sleeve is designed as a combination of the preceding shapes. Thus, the at least one retaining sleeve has at least one first and at least one second displacement position for the at least one brake unit. The at least one first displacement position is referred to as the rotation range, and the at least one second displacement position as the locking range. By utilizing a positive-locking connection between the at least one brake unit and the at least one retaining sleeve in the at least one locking range, and by allowing free rotation in the at least one rotation range, a tool-free rotation process is possible.

[0122] Advantageously, it is possible to rotate the at least one brake unit about the axial axis of rotation of the at least one profile strip when the at least one pluggable wheel connection according to claim 1 is unplugged.

[0123] In a further advantageous embodiment of the invention, the function of the at least one retaining cuff can also be realized by at least one retaining bracket, which is used instead of the at least one retaining cuff.

[0124] Advantageously, at least one further locking unit can be designed in multiple parts. For example, at least one further locking unit consists of at least one first circular ring, which can be rigidly connected to the profile strip, and at least one freely rotatable second circular ring, which is advantageously shorter in its longitudinal extent than the at least one first circular ring. The at least one first circular ring has at least one groove, and the at least one second circular ring is connected to the at least one first circular ring via this groove. At least one rotating element can be formed by the at least one first and the at least one second circular ring. The rotation of the at least one second circular ring can be stopped at at least two opposing positions.For this purpose, at least one first circular ring and / or at least one second circular ring has a through-opening into which at least one locking device can be inserted. This at least one locking device can, for example, be designed as a spring button or a locking cylinder.

[0125] Advantageously, at least one rotating element can be easily turned by an operator. This means that, in the unlocked state of the locking device, the at least one second circular ring can be easily rotated relative to the at least one first circular ring. The unlocked state of the locking device is present when the at least one wheel is removed from the first or second insertion position and is no longer inserted into the at least one profile strip and / or at least one receptacle.

[0126] Advantageously, the maximum angle by which the at least one first circular ring can be rotated relative to the at least one second circular ring is 180°. When rotating the brake unit, care must be taken to ensure that the at least one outer casing and / or the at least one inner core are not damaged.

[0127] Advantageously, at least one retaining bracket is arranged on the at least one second circular ring, which facilitates the unlocking of the at least one locking device by the user. The retaining bracket can also facilitate the rotation of the at least one second circular ring relative to the at least one first circular ring. Advantageously, the first circular ring is designed as a retaining sleeve. This makes it possible to assign several features to a component through functional integration, and fewer individual components need to be manufactured overall, thus facilitating replacement in case of failure or wear.

[0128] The second circular ring is advantageously designed as a brake sleeve. This makes it possible to assign multiple features to a single component through functional integration, and fewer individual components need to be manufactured overall, thus facilitating replacement in case of failure or wear.

[0129] During braking, at least one brake sleeve with at least one brake shoe is moved towards the wheel until the brake shoe contacts the wheel and presses against it radially. This creates a frictional force between the wheel and the brake shoe, which in turn slows the wheel down. The operating principle is the same as that of a rod brake.

[0130] The at least one brake shoe advantageously extends outwards from the at least one profile strip in a plane perpendicular to its outer surface and / or surface. It is simultaneously slidably mounted on the at least one brake sleeve. This allows the brake shoe to be moved according to the wheel's insertion position, ensuring that the brake shoe and wheel are on the same side of the profile tube.

[0131] The at least one core is located at least partially within the at least one sheath. The outer end of the at least one core is attached to the outer end of the at least one brake unit. This attachment is achieved via at least one receptacle on the at least one retaining sleeve, into which the outer end of the at least one core is received. The at least one sheath is in operative communication with the at least one brake sleeve.

[0132] Advantageously, the outer end of at least one core can be attached to and / or in at least one brake nipple.

[0133] Advantageously, the at least one brake nipple is rotatably connected to the at least one retaining sleeve about the axial axis of rotation of the at least one profile strip. The axial axis of rotation of the at least one profile strip is configured as the intersection axis of the at least two axes of symmetry of the at least one profile strip along its longitudinal extension.

[0134] Advantageously, at least one brake nipple follows the rotation of at least one brake unit about the axial axis of rotation of at least one profile strip. This allows for the simplest possible operation when rotating the at least one brake unit about the axial axis of rotation of the at least one profile strip.

[0135] Advantageously, at least one brake nipple is designed as a ring with a brake nipple. This allows for easy mounting of the at least one ring with brake nipple to the at least one retaining sleeve, which facilitates user-friendly rotation.

[0136] An advantageous feature of the pluggable wheel assembly is that, between the outer end of the at least one cable, where it is attached to the at least one brake unit, and the at least one brake shoe, at least one coil spring is additionally arranged around the at least one cable. This spring exerts a restoring spring force on the at least one brake shoe, so that after a tensile force is applied via the at least one brake line, through which the at least one brake shoe is pressed against the at least one wheel, it is returned away from the at least one wheel to its original starting position. This ensures reliable release of the brake after a braking operation.

[0137] Advantageously, at least one profile strip has at least one retaining unit that connects the at least one core to the at least one profile strip, in particular the ring with the brake nipple. The at least one retaining unit can be slid, clipped, positively locked, screwed, glued, or plugged onto the at least one profile strip. This ensures that the at least one core does not, for example, get caught on obstacles and thus prevent damage to the rollator.

[0138] Further advantages, features and design possibilities will result from the following description of figures illustrating exemplary embodiments, which are not to be understood as restrictive. Brief description of the drawings

[0139] The drawings show: Fig. 1 a perspective view of a rollator with pluggable wheel assemblies according to the invention; Fig. 2 a perspective view of the pluggable wheel assembly; Fig. 3 another perspective view of the pluggable wheel assembly; Fig. 4 a front view of the pluggable wheel assembly; Fig. 5 another perspective view of the pluggable wheel assembly; Fig. 6 another front view of the pluggable wheel assembly; Fig. 7 another perspective view of the pluggable wheel assembly; Fig. 8 another perspective view of the pluggable wheel assembly; Fig. 9 a perspective view of the pluggable wheel assembly with focus on the locking mechanism; Fig. 10 another perspective view of the pluggable wheel assembly; Fig. 11 another perspective view of the pluggable wheel assembly; Fig. 12 another perspective view of the pluggable wheel assembly; Fig. 13 a perspective view of the pluggable wheel assembly with focus on the locking mechanism; Fig.Fig. 14 Another perspective view of the pluggable wheel assembly with focus on the locking mechanism; Fig. 15 Another perspective view of the pluggable wheel assembly with focus on the locking mechanism; Fig. 16 Another perspective view of the pluggable wheel assembly with focus on the locking mechanism; Fig. 17 A perspective view of the locking mechanism; Fig. 18 Another perspective view of the locking mechanism; Fig. 19 A side view of the pluggable wheel assembly with focus on the locking mechanism; Fig. 20 Another side view of the pluggable wheel assembly with focus on the locking mechanism; Fig. 21 Another side view of the pluggable wheel assembly with focus on the locking mechanism; Fig. 22 A perspective view of two pluggable wheel assemblies in the inner position; Fig. 23 Another perspective view of two pluggable wheel assemblies in the outer position; .

[0140] In the drawings, elements designated with the same reference numerals are essentially equivalent to one another, unless otherwise indicated. Furthermore, components that are not essential for understanding the technical teaching disclosed herein are not shown or described. Additionally, reference numerals are not repeated for all elements already introduced and illustrated, provided that the elements themselves and their function have already been described or are known to a person skilled in the art. Detailed description of exemplary implementations

[0141] Fig. 1 Figure 1 shows a perspective view of a rollator 100 with pluggable wheel assemblies according to claim 1 of the invention. It can be seen that the rollator 100 has four profile strips (2.1, 2.2, 2.3 and 2.4) and four wheels (1.1, 1.2, 1.3 and 1.4). In the advantageous embodiment shown, the rear wheels (1.3 and 1.4) are designed as pluggable wheel assemblies according to the invention.

[0142] Fig. 2 Figure 1 shows a perspective view of the pluggable wheel assembly in an advantageous embodiment of the invention. The release unit located at the end of the wheel side of the plug-in axle 3 (not shown here) is in a locked position. The wheel assembly has a profile strip 2.1, which is shown here as a rectangular profile tube in cross-section. This allows the interior of the profile strip 2.1 to be seen.

[0143] It is further shown that the plug axle 3 can be inserted through the through-opening (not shown here), which in this advantageous embodiment of the invention is formed at an outer end of the profile strip 2.1, and that the wheel 1.1 is attached to the profile strip 2.1.

[0144] Furthermore, the curvatures 7.1 and 7.2 are each depicted as a recess in the profile strip 2.1 and are formed concentrically on both sides of the profile strip 2.1 towards the through-opening (not shown here). In the advantageous embodiment of the invention shown, the curvatures 7.1 and 7.2 project into the interior of the profile strip 2.1.

[0145] Furthermore, the bulges 7.1 and 7.2 have a through-opening (not marked here) through which, in this advantageous embodiment of the invention, the plug-in shaft 3 is inserted. In this exemplary embodiment, the plug-in shaft 3 does not project beyond the bulge 7.1, but is concealed within it.

[0146] Furthermore, an additional countersink is shown for each bulge 7.1 or 7.2, which is created, for example, with a countersink bit and has a larger diameter than the through-hole (not marked here). The countersink is arranged concentrically to the through-hole (not marked here).

[0147] The bulges 7.1 and 7.2 together with the locking unit 4 form a locking mechanism or are designed as a locking module.

[0148] At the outer end of the stub axle 3 on the side of the stub axle 3 facing away from the wheel 1.1, the locking unit 4 is shown, which is designed by way of example as a spring button or push button.

[0149] The spacer sleeve or spacer bushing 5 is then placed on the curvature 7.2, which is located on the side of the profile strip 2.1 facing the wheel 1.1. This spacer distances the wheel 1.1 from the profile strip 2.1 and / or the curvature 7.2, thus enabling free rotation of the wheel 1.1.

[0150] In this advantageous embodiment of the invention, the wheel 1.1 is connected to the axle 3 via a first bearing 9.1 and a second bearing (not shown here). The inner diameter of the first bearing 9.1 and the second bearing (not shown here) is nearly equal to the outer diameter of the axle 3. A corresponding fit is formed, which is either a clearance fit or an interference fit. Whether a clearance fit or an interference fit is present depends on the ratio of the respective inner diameter of the first bearing 9.1 or the second bearing (not shown here) to the outer diameter of the axle 3. The precise relationships are known to those skilled in the art and are therefore not described in detail here.

[0151] Using a hexagonal nut (not shown here), the wheel 1.1 is mounted on the axle 3 between the spacer bushing 5 and the hexagonal nut (not shown here) on the bearing surfaces of the first bearing 9.1 and the second bearing (not shown here), taking into account the longitudinal play of the wheel 1.1 relative to the spacer bushing 5 and / or the curvature 7.2 and / or the profile strip 2.1.

[0152] To ensure secure fastening, an external thread (not shown) is formed at the outer end of the axle 3 on the side facing the wheel 1.1. This thread has a diameter that matches the internal thread of the hexagonal nut (not shown). Using the hexagonal nut (not shown) and the external thread (not shown), it is possible to adjust the longitudinal play of the wheel 1.1 on the axle 3 relative to the spacer bushing 5 and / or the camber 7.2 and / or the profile strip 2.1.

[0153] Fig. 3 Figure 1 shows a perspective view of the pluggable wheel assembly in an advantageous embodiment of the invention. The wheel 1.1, a spacer sleeve or spacer bushing 5, and the locking unit 4, which in this case is designed as a push button or spring button and is arranged on the plug-in axle 3, are analogous to... Fig. 2 The profile strip 2.1 is shown as a rectangular profile tube. The curve 7.2 is also shown projecting into the profile strip 2.1. The curve 7.2, together with another curve (not shown here) and the locking unit 4, forms a locking mechanism, so that the axle 3 is attached to the profile strip 2.1. The spacer sleeve 5 shown distances the profile strip 2.1 and / or the curve 7.2 from the wheel 1.1.

[0154] Fig. 4 Figure 1 shows a front view of the pluggable wheel assembly in an advantageous embodiment of the invention. As already mentioned in Figure 2, the following features are shown: Fig. 2Discussed - the axle 3 on which the locking unit 4 is arranged, the wheel 1.1, the spacer sleeve or spacer bushing 5, and the bulges 7.1 and 7.2 projecting into the profile strip 2.1, which is shown as a rectangular profile tube, can be identified. Analogous to Fig. 2 The bulges 7.1 and 7.2, together with the locking unit 4, which is exemplified here as a spring-loaded button or push button, form a locking mechanism for the plug-in axle 3, enabling it to be attached to the profile strip 2.1. The release unit 8, also exemplified here as a spring-loaded button or push button, is also visible.

[0155] Fig. 5 Figure 1 shows a perspective view of the pluggable wheel assembly in an advantageous embodiment of the invention. Analogous to… Fig. 2The axle 3, the locking unit 4 attached to it, and the spacer sleeve or spacer bushing 5 are visible. The profile strip 2.1 is shown in section as a rectangular profile tube to better illustrate the bulges 7.1 and 7.2, which are arranged concentrically to the through-opening (not shown here) and project into the profile strip 2.1. The wheel hub 20 and the wheel 1.1 are only partially shown in this figure.

[0156] Fig. 6 Figure 1 shows another front view of the pluggable wheel assembly in an advantageous embodiment of the invention. Analogous to… Fig. 4The locking unit 4, which is arranged on the axle 3 and forms a locking mechanism with the bulges 7.1 and 7.2, is shown by way of example as a spring-loaded button or push button. This locking mechanism allows the axle 3 to be attached to the profile strip 2.1, which is designed as a rectangular profile tube. The spacer sleeve or spacer bushing distances the profile strip 2.1 and / or the bulge 7.2, which begins at the surface of the profile strip 2.1, from the wheel 1.1. Furthermore, the release unit 8 is shown by way of example in the form of a spring-loaded button or push button.

[0157] Fig. 7 shows a perspective view of the pluggable wheel arrangement in an advantageous embodiment of the invention.

[0158] This is analogous to Fig. 3The locking unit 4, which is arranged on the plug-in axle and forms a locking mechanism with the curvature 7.2 and another curvature (not shown here), and attaches the plug-in axle (not shown here) to the profile strip 2.1, is shown by way of example as a spring button or push button. The profile strip 2.1 is shown as a rectangular profile tube into which the curvature 7.2 and another curvature (not shown here) project. Analogous to Fig. 2 The spacer sleeve or spacer bushing 5 distances the wheel 1.1 from the profile strip 2.1 and / or the curvature 7.2, which begins on the surface of the profile strip 2.1.

[0159] Fig. 8 Figure 1 shows a perspective view of the pluggable wheel assembly in an advantageous embodiment of the invention. Analogous to… Fig. 2The locking unit 4, which is arranged on the axle 3 and forms a locking mechanism with the bulges 7.1 and 7.2, thus securing the axle 3 to the profile strip 2.1, is shown by way of example as a spring button or push button. Here, the bulges 7.1 and 7.2 project from the surface of the profile strip 2.1 into it. The profile strip 2.1 is shown in cross-section as a rectangular profile tube to better illustrate its interior. The wheel 1.1, mounted on the wheel hub (not shown here), is spaced from the profile strip 2.1 and / or the bulge 7.2 by the spacer sleeve or spacer bushing 5.

[0160] Fig. 9 Figure 1 shows a perspective view of the pluggable wheel assembly in an advantageous embodiment of the invention. Analogous to… Fig. 2The locking unit 4, which is arranged on the axle 3 and forms a locking mechanism with the bulges 7.1 and 7.2, thus securing the axle 3 to the profile strip 2.1, is shown by way of example as a spring button or push button. Here, the bulges 7.1 and 7.2 project from the surface of the profile strip 2.1 into it. The profile strip 2.1 is shown in cross-section as a rectangular profile tube to better illustrate its interior. The wheel (not shown) mounted on the wheel hub (not shown here) is spaced from the profile strip 2.1 and / or the bulge 7.2 by the spacer sleeve or spacer bushing 5.

[0161] Fig. 10Figure 1 shows a perspective view of the pluggable wheel assembly in an advantageous embodiment of the invention. The release unit 8, which is connected to the locking unit 4, is in a release position. The wheel assembly has a profile strip 2.1, which is shown here as a rectangular profile tube with a partial half-section. This allows the insertion area of ​​the locking unit 4 and / or the release unit 8 to be identified within the interior of the profile strip 2.1.

[0162] It is further shown that the plug axle 3 can be inserted through the through-opening (not shown here), which in this advantageous embodiment of the invention is formed at an outer end of the profile strip 2.1, and that the wheel 1.1 is attached to the profile strip 2.1.

[0163] Furthermore, the curvature 7.1 and another curvature (not shown here) are each depicted as a recess in the profile strip 2.1 and are formed concentrically on both sides of the profile strip 2.1 towards the through-opening (not shown here). In the advantageous embodiment of the invention shown, the curvature 7.1 and the other curvature (not shown here) do not project into the interior of the profile strip 2.1.

[0164] Furthermore, the bulges 7.1 and 7.2 have a through-opening (not shown here) through which, in this advantageous embodiment of the invention, the plug-in axle 3 is inserted. In this exemplary embodiment, the plug-in axle 3 does not project beyond the bulge 7.1, but is concealed within it or within the profile strip 2.1.

[0165] The spacer bushing 5 is then placed on the further curvature (not shown here) located on the side of the profile strip 2.1 facing the wheel 1.1. This spacer bushing distances the wheel 1.1 from the profile strip 2.1 and / or the further curvature (not shown here), thus allowing the wheel 1.1 to run freely.

[0166] Furthermore, the double bore 11 is formed in the release unit 8. A double bore 11 is understood to be a combination of a smaller through bore with a smaller bore diameter, located on the side of the double bore 11 facing the locking unit 4, and another through bore whose bore diameter corresponds almost exactly to the outer diameter of the stub shaft 3. The smaller bore diameter corresponds almost exactly to the outer diameter of the annular groove (not shown here) on the stub shaft 3, whereby the annular groove (not shown here) is located on the side of the stub shaft 3 facing away from the wheel 1.1, and the outer diameter of the annular groove (not shown here) is smaller than the outer diameter of the stub shaft 3. A corresponding fit is formed, which is either a clearance fit or an interference fit.Whether a clearance fit or an interference fit exists depends on the ratio of the respective bore diameter of the double bore and the outer diameter of the annular groove (not shown here) or the outer diameter of the plug shaft 3, whereby the more precise relationships are known to a person skilled in the art and are therefore not explained in more detail here.

[0167] The locking unit 4, analogous to the profile strip 2.1, has a further through-opening 10, by means of which a retaining pin (not shown), which can be inserted through the further through-opening 10, mounts the locking unit 4 in the profile strip 2.1. A fit exists, which is either a clearance fit or an interference fit. Whether a clearance fit or an interference fit exists depends on the ratio of the diameter of the further through-opening 10 and the outer diameter of the retaining pin (not shown), the precise relationships of which are known to those skilled in the art and are therefore not described in detail here.

[0168] The locking unit 4 and the release unit 8 are connected to each other via a connecting element (not shown here), which is exemplified as a spiral spring or helical spring. By applying force to the release unit 8, the connecting element (not shown here) can be compressed, thus moving the release unit 8 into a release position in which the plug-in shaft 3 can be inserted through the through-hole (not shown here) and the double bore 11. When the force on the release unit 8 is removed, the spring action of the connecting element (not shown here) returns the release unit 8 to a locked position. This prevents the plug-in shaft 3 from being separated from the profile strip 2.1, as the smaller bore and the outer surface of the annular groove (not shown here) are in contact, thus preventing movement of the plug-in shaft 3 along its length.

[0169] In this advantageous embodiment of the invention, the wheel 1.1 is connected to the axle 3 via a first bearing 9.1 and a second bearing (not shown here). The inner diameter of the first bearing 9.1 and the second bearing (not shown here) is nearly equal to the outer diameter of the axle 3. A corresponding fit is formed, which is either a clearance fit or an interference fit. Whether a clearance fit or an interference fit is present depends on the ratio of the respective inner diameter of the first bearing 9.1 or the second bearing (not shown here) to the outer diameter of the axle 3. The precise relationships are known to those skilled in the art and are therefore not described in detail here.

[0170] Using a hexagonal nut (not shown here), the wheel 1.1 is mounted on the axle 3 between the spacer bushing 5 and the hexagonal nut (not shown here) on the bearing surfaces of the first bearing 9.1 and the second bearing (not shown here), taking into account the longitudinal play of the wheel 1.1 relative to the spacer bushing 5 and / or the curvature 7.2 and / or the profile strip 2.1.

[0171] To ensure secure fastening, an external thread (not shown) is formed at the outer end of the axle 3 on the side facing the wheel 1.1. This thread has a diameter that matches the internal thread of the hexagonal nut (not shown). Using the hexagonal nut (not shown) and the external thread (not shown), it is possible to adjust the longitudinal play of the wheel 1.1 on the axle 3 relative to the spacer bushing 5 and / or the camber 7.2 and / or the profile strip 2.1.

[0172] Fig. 11 Figure 1 shows a perspective view of the pluggable wheel assembly in an advantageous embodiment of the invention. The release unit 8, which is connected to the locking unit 4, is in a locked position. Furthermore, the connecting element 12 is, by way of example, designed as a spiral spring or helical spring and is arranged between the locking unit 4 and the release unit 8. Analogous to Fig. 10 The bearing 9.1, which is arranged on the axle 3, the profile strip 2.1, which is designed as a rectangular profile tube, and the further through-opening 10, through which a retaining pin (not shown here) can be inserted to mount the locking unit 4 in the profile strip 2.1, are shown. The wheel 1.1, which is spaced from the profile strip 2.1 by the spacer sleeve or spacer bushing 5, is also visible.

[0173] Fig. 12Figure 1 shows a perspective view of the pluggable wheel assembly in an advantageous embodiment of the invention. The release unit 8, which is connected to the locking unit 4, is located analogously to… Fig. 10in a release position. The profile strip 2.1, shown by way of example as a rectangular profile tube with a half-section in the area of ​​the locking unit 4 and the release unit 8, the bearing 9.1, which is arranged on the plug-in shaft 3, and the further through-opening 10, through which a retaining pin (not shown here) can be inserted to mount the locking unit 4 in the profile strip 2.1, are shown. Also visible are the wheel 1.1, the spacer sleeve or spacer bushing 5 mounted on the plug-in shaft 3, and the annular groove 13, whose outer diameter is smaller than the outer diameter of the plug-in shaft 3. In the figure shown, the pluggable wheel assembly is in the middle of a transfer process from a first plug-in position to a second plug-in position, but the pluggable wheel assembly has not yet been moved into the second plug-in position.

[0174] Fig. 13Figure 1 shows a perspective view of the pluggable wheel assembly in an advantageous embodiment of the invention, focusing on the locking mechanism. The profile strip is not shown; instead, the view is limited to the locking unit 4, the connecting element 12 (example being a spiral spring or helical spring), the release unit 8 with the double bore 11 (both shown here in section), the plug-in axle 3 with the annular groove 13, the spacer sleeve or spacer bushing 5, the bearing 9.1, and the wheel hub 20. The release unit 8, which is connected to the locking unit 4, is shown here in the release position. It is also clearly visible that the connecting element 12 is compressed.In addition, the further through-opening 10 in the locking unit 4 is shown, which is located on the side of the locking unit 4 facing away from the connecting element 12 and through which a retaining pin (not shown) can be inserted in order to mount the locking unit 4 in the profile strip 2.1.

[0175] Fig. 14Figure 1 shows a perspective view of the pluggable wheel assembly in an advantageous embodiment of the invention, focusing on the locking mechanism. The profile strip is not shown; instead, the view is limited to the locking unit 4, the connecting element 12 (example being a spiral spring or helical spring), the release unit 8 with the double bore 11 (both shown here in section), the plug-in axle 3, the annular groove 13, the spacer sleeve or spacer bushing 5, the bearing 9.1, and the wheel hub 20. The release unit 8, which is connected to the locking unit 4, is shown here in the locked position. It is also clearly visible that the connecting element 12 is released and the smaller through-bore of the double bore 11 is in operative contact with the cylindrical surface of the annular groove 13.In addition, the further through-opening 10 in the locking unit 4 is shown, which is located on the side of the locking unit 4 facing away from the connecting element 12 and through which a retaining pin (not shown) can be inserted in order to mount the locking unit 4 in the profile strip 2.1.

[0176] Fig. 15Figure 1 shows a perspective view of the pluggable wheel assembly in an advantageous embodiment of the invention, focusing on the locking mechanism. The illustration is limited to the profile strip 2.1, which is shown by way of example as a rectangular profile tube with a half-section in the area of ​​the locking unit 4 and the release unit 8, the locking unit 4, the connecting element 12, which is designed by way of example as a coil spring or helical spring, the release unit 8 with the double bore 11, the plug-in axle 3, the spacer sleeve or spacer bushing 5, the bearing 9.1, and the wheel hub 20. The release unit 8, which is connected to the locking unit 4, is shown here in the release position. It is also clearly visible that the connecting element 12 is compressed.Furthermore, the additional through-opening 10 in the locking unit 4 is shown, which is located on the side of the locking unit 4 facing away from the connecting element 12 and through which a retaining pin (not shown) can be inserted to mount the locking unit 4 in the profile strip 2.1. It is also evident that the plug-in axis 3 does not protrude laterally beyond the profile strip 2.1 and is thus concealed within it or the curvature (not shown here).

[0177] Fig. 16Figure 1 shows a perspective view of the pluggable wheel assembly in an advantageous embodiment of the invention, focusing on the locking mechanism. The illustration is limited to the profile strip 2.1, which is shown by way of example as a rectangular profile tube with a half-section in the area of ​​the locking unit 4 and the release unit 8, the locking unit 4, the connecting element 12, which is designed by way of example as a coil spring or helical spring, the release unit 8 with the double bore 11, the plug-in axle 3, the spacer sleeve or spacer bushing 5, the bearing 9.1, and the wheel hub 20. The release unit 8, which is connected to the locking unit 4, is shown here in the locked position, and the smaller through-bore of the double bore 11 is in operative contact with the cylindrical surface of the annular groove (not shown here). It is also clearly visible that the connecting element 12 is released.Furthermore, the additional through-opening 10 in the locking unit 4 is shown, which is located on the side of the locking unit 4 facing away from the connecting element 12 and through which a retaining pin (not shown) can be inserted to mount the locking unit 4 in the profile strip 2.1. It is also evident that the plug-in axis 3 does not protrude laterally beyond the profile strip 2.1 and is thus concealed within it or the curvature (not shown here).

[0178] Fig. 17Figure 1 shows a perspective view of the locking mechanism in an advantageous embodiment of the invention. The illustration is limited to the profile strip 2.1, which is shown by way of example as a rectangular profile tube with a half-section in the area of ​​the locking unit 4 and the release unit 8, the locking unit 4, the connecting element 12, which is designed by way of example as a spiral spring or helical spring, and the release unit 8 with the double bore 11. The release unit 8, which is connected to the locking unit 4, is shown here in the release position. It is also clearly visible that the connecting element 12 is compressed. Furthermore, the additional through-opening 10 in the locking unit 4 is shown, through which a retaining pin (not shown) can be inserted to mount the locking unit 4 in the profile strip 2.1. It is also evident that the bulge 7.1 is concentric to the large bore of the double bore 11 in the release position.

[0179] Fig. 18Figure 1 shows a perspective view of the locking mechanism in an advantageous embodiment of the invention. The illustration is limited to the profile strip 2.1, which is shown by way of example as a rectangular profile tube with a half-section in the area of ​​the locking unit 4 and the release unit 8, the locking unit 4, the connecting element 12, which is designed by way of example as a spiral spring or helical spring, and the release unit 8 with the double bore 11. The release unit 8, which is connected to the locking unit 4, is shown here in the locked position. It is also clearly visible that the connecting element 12 is released. Furthermore, the additional through-opening 10 in the locking unit 4 is shown, through which a retaining pin (not shown) can be inserted to mount the locking unit 4 in the profile strip 2.1. It is also evident that the bulge 7.1 is concentric to the small bore of the double bore 11 in the locked position.

[0180] Fig. 19Figure 1 shows a side view of the pluggable wheel assembly in an advantageous embodiment of the invention, focusing on the locking mechanism. The figure shows the profile strip 2.1, which is shown by way of example as a rectangular profile tube with a partial section in the area of ​​the locking unit 4 and the release unit 8, the locking unit 4, the release unit 8 with the double bore 11, the plug-in axle (not marked here), the bulge 7.1, and the wheel hub 20. The release unit 8, which is connected to the locking unit 4, is in the release position. The connecting element is not visible here. The figure also shows the additional through-opening 10 in the locking unit 4 and the profile strip 2.1, which is located on the side of the locking unit 4 facing away from the connecting element (not shown) and through which a retaining pin (not shown) can be inserted to mount the locking unit 4 in the profile strip 2.1.The curvature (7.1) located laterally on the profile strip 2.1 is also visible, which in the release position is concentric to the large bore of the double bore 11.

[0181] Fig. 20Figure 1 shows another side view of the pluggable wheel assembly in an advantageous embodiment of the invention, focusing on the locking mechanism. The figure shows the profile strip 2.1, which is exemplified as a rectangular profile tube with a partial section in the area of ​​the locking unit 4 and the release unit 8, the locking unit 4, the release unit 8 with the double bore 11, the plug-in axle (not marked here), the bulge 7.1 located laterally on the profile strip 2.1, the connecting element 12, and the wheel hub 20. The release unit 8, which is connected to the locking unit 4, is shown here in a transition position between the release position and the locked position. The connecting element 12, which is exemplified as a spiral spring or helical spring, is partially visible because it is relaxed, and thus the bulge (7.1) is no longer concentric with the large bore of the double bore 11.In addition, the further through-opening 10 in the locking unit 4 and the profile strip 2.1 is shown, which is located on the side of the locking unit 4 facing away from the connecting element 12 and through which a retaining pin (not shown) can be inserted in order to mount the locking unit 4 in the profile strip 2.1.

[0182] Fig. 21Figure 1 shows another side view of the pluggable wheel assembly in an advantageous embodiment of the invention, focusing on the locking mechanism. The profile strip 2.1, shown by way of example as a rectangular profile tube with a partial section in the area of ​​the locking unit 4 and the release unit 8, the locking unit 4, the release unit 8 with the double bore 11, the plug-in axle (not marked here), the bulge 7.1 located laterally on the profile strip 2.1, the connecting element 12, and the wheel hub 20 are shown. The release unit 8, which is connected to the locking unit 4, is shown here in the locked position. The connecting element 12, which is designed by way of example as a coil spring or helical spring, is clearly visible because it is relaxed, and thus the smaller through-hole of the double bore 11 is in operative contact with the cylindrical surface of the annular groove (not shown here).In addition, the further through-opening 10 in the locking unit 4 and the profile strip 2.1 is shown, which is located on the side of the locking unit 4 facing away from the connecting element 12 and through which a retaining pin (not shown) can be inserted in order to mount the locking unit 4 in the profile strip 2.1.

[0183] Fig. 22 Figure 1 shows a perspective view of two pluggable wheel assemblies in the inner position in an advantageous embodiment of the invention. It can be seen that by using the second pluggable position, also called the inner position, a reduction in the track width, i.e., the distance between two adjacent wheels (not shown here), is possible. This allows for improved use, for example, of a rollator (not shown here) indoors.

[0184] Fig. 23Figure 1 shows a perspective view of two pluggable wheel assemblies in the outer position in an advantageous embodiment of the invention. It can be seen that by using the first pluggable position, also called the outer position, it is possible to increase the track width, i.e., the distance between two adjacent wheels (not shown here). This allows for greater stability, for example, of a rollator (not shown here) when used off-road or on the road.

[0185] Although the invention has been illustrated and described in detail by the advantageous embodiments, the invention is not limited by the disclosed examples. Reference symbol list

[0186] 1.1, 1.2, 1.3, 1.4 Wheel 2.1, 2.2, 2.3, 2.4 Profile strip 3 Axle 4 Locking unit 5 Spacer bushing 6 Through opening 7.1, 7.2 Curvature 8 Release unit 9.1, 9.2 Bearing 10 Additional through opening 11 Double bore 12 Connecting element 13 Ring groove 20 wheel hub 100 Rollator

Claims

1. Plug-in wheel assembly comprising at least one wheel (1.1; 1.2; 1.3; 1.4), at least one profile strip (2.1; 2.2; 2.3; 2.4), at least one thru axle (3), at least one latching unit (4), wherein the at least one wheel (1.1; 1.2; 1.3; 1.4) is designed to be connectable to the at least one thru axle (3), wherein the at least one profile strip (2.1; 2.2; 2.3; 2.4) has at least one passage opening (6) perpendicular to the outer surface and / or surface of the at least one profile strip (2.1; 2.2; 2.3; 2.4), wherein the at least one thru axle (3) is designed to be threadable through the at least one passage opening (6) of the at least one profile strip (2.1; 2.2; 2.3; 2.4) and wherein the at least one thru axle (3) is lockable on the at least one profile strip (2.1; 2.2; 2.3; 2.4) from each side of the at least one profile strip (2.1; 2.2; 2.3; 2.4), characterized in that the at least one profile strip (2.1; 2.2; 2.3; 2.4) comprises at least one bulge (7.1; 7.2), wherein the at least one bulge (7.1; 7.2) protrudes inwardly and / or outwardly from the surface of the at least one profile strip (2.1; 2.2; 2.3; 2.4) and / or protruding outwards, wherein the bulge (7.1; 7.2) is formed concentrically with the passage opening (6).

2. Plug-in wheel assembly according to claim 1, characterized in that at least one bulge (7.1; 7.2) is arranged on the at least one profile strip (2.1; 2.2; 2.3; 2.4) on each side of the at least one passage opening (6) of the at least one profile strip (2.1; 2.2; 2.3; 2.4).

3. Plug-in wheel assembly according to patent claim 1 or 2, characterized in that the at least one wheel (1.1; 1.2; 1.3; 1.4) and the at least one thru axle (3) are pluggable from each side of the profile strip (2.1; 2.2; 2.3; 2.4) into the respective at least one passage opening (6) of the at least one profile strip (2.1; 2.2; 2.3; 2.4) and / or the at least one bulge (7.1; 7.2) from each side of the profile strip (2.1; 2.2; 2.3; 2.4), whereby the at least one wheel (1.1; 1.2; 1.3; 1.4) is movable into a first plug-in position and a second plug-in position.

4. Plug-in wheel assembly according to patent claims 1 - 3, characterized in that a change in track width is effectible by moving the at least one wheel (1.1; 1.2; 1.3; 1.4) from a first plug-in position to a second plug-in position and / or vice versa, and / or at least one limit stop is arranged on the side of the at least one plug-in axle (3) facing the at least one wheel (1.1; 1.2; 1.3; 1.4), wherein the at least one limit stop spaces the at least one wheel (1.1; 1.2; 1.3; 1.4) from the at least one bulge (7.1; 7.2) and / or the at least one profile strip (2.1; 2.2; 2.3; 2.4) and / or the at least one limit stop is designed such that the at least one thru axle (3) does not protrude laterally from the profile strip (2.1; 2.2; 2.3; 2.4) and / or bulge (7.1; 7.2) in any plug-in position.

5. Plug-in wheel assembly according to patent claims 1 - 4, characterized in that the at least one profile strip (2.1; 2.2; 2.3; 2.4) is designed as a profile tube or as a grid-filled rod.

6. Plug-in wheel assembly according to patent claims 1 - 5, characterized in that the at least one bulge (7.1; 7.2) with the at least one latching unit (4) form at least one latching and / or are designed as at least one latching module.

7. Plug-in wheel assembly according to patent claim 1 or 6, characterized in that the at least one latching unit (4) is arranged on the side of the thru axle (3) facing away from the wheel (1.1; 1.2; 1.3; 1.4).

8. Plug-in wheel assembly according to patent claims 1 - 7, characterized in that the at least one bulge (7.1; 7.2) on each side of the at least one profile strip (2.1; 2.2; 2.3; 2.4) form at least one circumferential ring groove corresponding to the shape of at least one latching unit (4) inside the at least one profile strip (2.1; 2.2; 2.3; 2.4) and / or the at least one bulge (7.1; 7.2) on each side of the at least one profile strip (2.1; 2.2; 2.3; 2.4) has at least one circumferential ring groove corresponding to the shape of at least one latching unit (4) in the inner and / or outer mantle surface of at least one bulge (7.1; 7.2).

9. Plug-in wheel assembly according to patent claim 1 or 6-8, characterized in that the at least one latching unit (4) is designed as an insert that is slidable and / or insertable into the at least one profile strip (2.1; 2.2; 2.3; 2.4) and / or the at least one latching unit (4) is designed to be connectable to the at least one release unit (8) via at least one connecting element (12) and / or the at least one latching unit (4) together with the at least one connecting element (12) and the at least one release unit (8) form at least one latching and / or at least one latching module, and / or the at least one release unit (8) has at least one passage bore, wherein the at least one passage bore is designed as a double bore (11) with two different diameters.

10. Plug-in wheel assembly according to patent claim 1 or 3 or 4, characterized in that the at least one thru axle (3) has a circumferential ring groove (13).

11. Plug-in wheel assembly according to patent claim 9, characterized in that at least one double bore (11) has a first and a second diameter, wherein the first diameter corresponds to the outer diameter of at least one ring groove (13) of at least one thru axle (3), and the second diameter corresponds to the outer diameter of the at least one thru axle (3) in such a way that the diameters of the double bore (11) and the respective outer diameters of the at least one ring groove (13) and the at least one thru axle (3) are each designed as a fit.

12. Plug-in wheel assembly according to patent claim 9, characterized in that the at least one release unit (8) has at least one recess on each side of the at least one release unit (8), wherein the shape of the at least one recess is designed to follow the shape of the at least one double bore (11).

13. Plug-in wheel assembly according to patent claims 1 - 9, characterized in that the at least one profile strip (2.1; 2.2; 2.3; 2.4) and the at least one latching unit (4) have at least one further passage opening (10), wherein at least one holding element is designed to be threadable through the at least one further passage opening (10) of the at least one profile strip (2.1; 2.2; 2.3; 2.4) and the at least one latching unit (4).

14. Plug-in wheel assembly according to one of the previous patent claims, characterized in that the at least one latching and / or the at least one latching module is designed to be self-locking.

15. Rollator (100) comprising at least two profile strips (2.1; 2.2; 2.3; 2.4), at least one further profile strip, at least three wheels (1.1; 1.2; 1.3; 1.4), with at least one plug-in wheel assembly according to one of the previous patent claims, wherein by the at least one plug-in wheel assembly a change of the track width of the rollator is effectible, wherein at least one brake unit is arranged on at least one holding sleeve, wherein the at least one holding sleeve is arranged on the at least one profile strip (2.1; 2.2; 2.3; 2.4) and / or the at least one brake unit is rotatable about the axial rotation axis of the at least one profile strip (2.1; 2.2; 2.3; 2.4), wherein the at least one holding sleeve is designed as a further latching unit and / or the at least one brake unit has at least one brake sleeve with at least one brake shoe arranged thereon and / or the at least one brake sleeve is displaceable by application of tensile force via at least one brake line, wherein the at least one brake line is designed as a Bowden cable and comprises at least one core and at least one sheath.