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.

[0005] If someone relies on a rollator and wants to use one both indoors and outdoors, they will inevitably need one for indoors and one for outdoors. 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 co-payment.

[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] EP 4 438 322 A2 discloses a pluggable wheel assembly comprising at least one profile tube, at least one axle, at least one wheel connectable to the axle, and at least one retaining bracket. The retaining bracket allows the axle to be locked to the profile tube from either side. The retaining bracket and the profile tube each have at least one bore through which the axle can be inserted. Task

[0011] The object of the present invention is to provide a pluggable wheel arrangement, for example for a rollator, which allows the track width of a rollator to be increased or decreased, for example by making the wheels mountable, in particular pluggable, on both sides of a profile strip of the rollator. Solution

[0012] This problem is solved by the 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, at least one locking unit, at least one receptacle, and at least one stop, wherein the at least one wheel is designed to be connectable to the at least one plug-in axle, and wherein the at least one locking unit and the at least one stop are arranged on the at least one plug-in axle. The at least one profile strip and the at least one receptacle have 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 and the at least one receptacle. 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 receptacle is arranged on the at least one profile strip. The at least one receptacle is formed on each side of the at least one through-opening of the at least one profile strip.

[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, the at least one profile strip has at least one axial axis of rotation, wherein the at least one axial axis of rotation is formed as the intersection axis of the at least two axes of symmetry of the at least one profile strip along its longitudinal extent. This means that the at least one through-hole is also arranged perpendicular to the axial axis of rotation of the at least one profile strip.

[0017] 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.

[0018] 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.

[0019] 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.

[0020] Advantageously, a rollator can be designed with at least two pluggable wheel assemblies according to the invention. These at least two pluggable wheel assemblies are essentially arranged side by side in pairs. The rollator features a combination of at least two further wheel assemblies that already have a narrower 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 in the first pluggable position, also called the outer position, the track width is increased. If the at least one wheel is in the second pluggable position, also called the inner position, the track width is decreased.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] Advantageously, at least one stop can be designed as a spacer bushing or spacer sleeve.

[0028] Advantageously, 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, for example, at least two bearings, taking into account longitudinal play, using at least one clamping ring.

[0029] Advantageously, at least one clamping ring can be designed as a hexagonal nut.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] The profile strip can be advantageously made of plastic, fiber-reinforced plastic, metal, or carbon.

[0034] 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. For example, at least one protective cover or protective profile can be mounted using the at least one guide groove.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] Advantageously, at least one of the openings can be circular, oval, elliptical, polygonal, or star-shaped.

[0041] Advantageously, the shapes of at least one stub axle and at least one through-hole are identical.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] Advantageously, the at least one receptacle can be polygonal, circular, annular, elliptical, or oval. The center of the through-opening lies on at least one axis of symmetry of the at least one receptacle, more advantageously on the longitudinal axis of symmetry of the at least one receptacle, and even more advantageously on both axes of symmetry of the at least one receptacle. For the dirt-protected placement of the at least one stop on the at least one receptacle, the at least one receptacle can have at least one recess.

[0046] This at least one countersink or counterbore can, in its shape, be advantageously larger than the described through-hole. The at least one countersink can be straight or tapered in depth.

[0047] The outer or bottom surface of the at least one recess of the at least one receptacle may, for example, feature mounting grooves or similar recesses that can be used for the positive locking of components. A similar feature may be formed on the surface of the at least one receptacle or, in the absence of the at least one recess, in the outer surface of the at least one through-opening. Furthermore, the shape of the at least one receptacle on the side facing the profile strip is identical to the outer surface of the at least one profile strip on which the at least one receptacle can be mounted.

[0048] 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 countersink or counterbore. 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.

[0049] It is advantageous to have at least one mounting point, for example, screwed, welded, melted, glued, or plugged into at least one profile strip.

[0050] Advantageously, at least one receptacle has a counterpart to at least one locking unit, whereby at least one stub axle can be locked to at least one locking unit and at least one receptacle.

[0051] Advantageously, at least one locking unit is designed to be releasable by an operator. Releasing the locking unit 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.

[0052] 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.

[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 wheel, in which at least one recess or at least one countersunk bore of the at least one receptacle can be placed in a form-fitting manner.

[0056] In an advantageous embodiment of the invention according to claim 2, at least one receptacle 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. In a further possible embodiment, the at least one locking unit and the at least one receptacle form a locking mechanism and / or are designed as a locking module. This makes it possible to replace the at least one receptacle as a separate component without significant effort if it is damaged.

[0057] By designing the locking mechanism and / or locking module with at least one locking unit and at least one receptacle, particularly good handling is achieved, while also facilitating the replacement of individual components. For example, if the locking unit is worn, it can be replaced without having to replace the entire locking mechanism and / or the entire locking module. This is sustainable and saves costs.

[0058] 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 respective through-opening of the at least one profile strip and / or the at least one receptacle, whereby the at least one wheel can be moved into a first insertion position and a second insertion position. In a further alternative embodiment of the invention, a change in track width can be effected by moving the at least one wheel from a first insertion position to a second insertion position and / or vice versa.

[0059] The second insertion position is located on the opposite side from the at least one profile strip. This means that the at least one wheel, with its at least one axle, can be inserted into the at least one through-opening of the at least one profile strip and / or the at least one receptacle from either side of the at least one profile strip, i.e., from both sides. This allows the position of the at least one wheel on the at least one profile strip to be changed easily and quickly. The first insertion position can also be referred to as the outer position and the second as the inner position. Thus, the at least one wheel can be positioned either inside or outside as appropriate.

[0060] Changing the wheel position is quick and easy thanks to the wheel arrangement described here. By repositioning at least one wheel, it's possible to increase or decrease the track width – for example, of a rollator. 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 rail the at least one wheel is inserted into. If the at least one wheel is in the first insertion position, also called the outer position, the track width is increased. If the at least one wheel is in the second insertion position, also called the inner position, the track width is decreased.

[0061] Advantageously, with a pluggable wheel arrangement, the distance between the wheel center and the center of at least one profile tube is 45 mm. This means that when at least one wheel is moved or repositioned by 180°, the distance is shifted by 90 mm 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 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 significantly improves the stability and security of the rollator, making it suitable for outdoor use.

[0062] 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.

[0063] Advantageously, in a further possible embodiment of the invention, it is provided that a change in track width can be effected by moving at least one wheel from a first plug-in position to a second plug-in position and / or vice versa.

[0064] If a pluggable wheel arrangement according to the invention is used in accordance with claim 1, it is easy to switch from a first pluggable position, also called outer position, to a second pluggable position, also called inner position, as already described.

[0065] Advantageously, with a pluggable wheel arrangement, the distance between the wheel center and the center of at least one profile tube is approximately 45 mm. This means that when at least one wheel is moved or repositioned by 180°, the distance is shifted by approximately 90 mm 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 to an outer position—the overall 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.

[0066] 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.

[0067] In an advantageous embodiment of the invention according to claim 4, 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 mechanism and / or the locking module can be moved from a released to a locked or latched state without the intervention of an operator.

[0068] Advantageously, at least one locking mechanism and / or at least one locking module is designed to be releasable by an operator. Releasing the at least one locking mechanism and / or at least one locking module can advantageously be achieved, for example, by integrating a spring-loaded button and / or push button. This spring-loaded button and / or push button can, for example, be located on the wheel side.

[0069] In an advantageous embodiment of the invention according to claim 5, the at least one locking unit is arranged on the side of the at least one axle facing away from the at least one 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 receptacle.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, at least one locking device and / or at least one locking module consisting of the at least one locking unit and the at least one receptacle can be designed such that the at least one plug-in axle does not project laterally beyond the at least one profile strip and the at least one receptacle.

[0070] In an advantageous embodiment of the invention according to claim 6, it is provided that the at least one stop is arranged on the side of the at least one axle facing the at least one wheel, wherein the at least one stop distances the at least one wheel from the at least one receptacle.

[0071] The advantage of this design is that the wheel can always be mounted in such a way that free rotation of at least one wheel is guaranteed. This means that the spacing ensures that the movement of at least one wheel is not impaired by other components of the wheel assembly. A possible braking device is an exception to this.

[0072] In an advantageous embodiment of the invention according to claim 7, 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 the receptacle in any plug-in position. Depending on the length of the at least one plug-in axle and the positioning of the at least one stop on the at least one plug-in axle, the latter can be designed such that the at least one plug-in axle does not project laterally beyond the at least one profile strip and the at least one receptacle.

[0073] Advantageously, at least one stop is arranged in such a way that at least one locking unit can be connected to at least one receptacle in such a way that at least one locking unit is not visible.

[0074] In an advantageous embodiment of the invention according to claim 8, the at least one receptacle has at least one circumferential annular groove in the outer surface of the at least one through-opening, 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 receptacle 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 receptacle.

[0075] In an advantageous embodiment of the invention according to claim 9, it is provided that the at least one receptacle on each side of the at least one profile strip is arranged flush and / or symmetrically and / or concentrically to the at least one through-opening at the outer end of the at least one profile strip.

[0076] It is advantageous to have at least one recess on each side of at least one profile strip, flush with the outer end of the profile strip. This simplifies the placement of the recess on the profile strip.

[0077] It is advantageous to have at least one recess on each side of at least one profile strip, arranged symmetrically. This allows for easy replacement of the recess if damaged, and it is sufficient to manufacture only one type of recess for each profile strip. Costs can therefore be saved, as the shape of the recess does not differ depending on which side it is located on.

[0078] Advantageously, at least one receptacle per side of the at least one profile strip is arranged concentrically to the at least one through-opening. This easily ensures that the at least one insertion axis can be inserted through the at least one receptacle and the at least one profile strip.

[0079] In an advantageous embodiment of the invention according to claim 10, it is provided that the at least one profile strip is designed as a profile tube or as a rod filled with a grid.

[0080] 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.

[0081] 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.

[0082] Claim 11 further provides a rollator with at least one pluggable wheel assembly according to claim 1, wherein at least one pluggable wheel assembly allows for a change in the track width of the rollator. 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, the track width always being defined as the distance between at least two wheels.

[0083] 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.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] In an advantageous embodiment of the invention according to claim 12, it is provided for a rollator according to claim 11 that 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.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] It is advantageous that at least one brake unit is shorter in its longitudinal extent compared to at least one retaining sleeve.

[0092] 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.

[0093] 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.

[0094] 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. Even more advantageous is the ability to mount at least one brake unit onto at least one retaining sleeve without tools.

[0095] 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.

[0096] Advantageously, at least one retaining pin can be circular, oval, elliptical, polygonal, or star-shaped.

[0097] It is advantageous for at least one retaining pin to also be designed as a retaining bolt.

[0098] In an advantageous embodiment of the invention according to claim 13, it is provided for a rollator according to claim 11 that 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.

[0099] 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 extent of the at least one profile strip.

[0100] Advantageously, the outer shape of at least one retaining cuff may be circular, oval, elliptical, polygonal, or star-shaped.

[0101] 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.

[0102] 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.

[0103] 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.

[0104] 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.

[0105] 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.

[0106] 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.

[0107] 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.

[0108] The first circular ring is advantageously designed as a retaining 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.

[0109] 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.

[0110] In an advantageous embodiment of the invention according to claim 14, it is provided for a rollator according to claim 11 that the at least one brake unit has at least one brake sleeve with at least one brake shoe arranged thereon.

[0111] 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.

[0112] 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.

[0113] In an advantageous embodiment of the invention according to claim 15, it is provided for a rollator according to claim 11 that the at least one brake sleeve is displaceable by means of applying 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.

[0114] 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 contact with the at least one brake sleeve.

[0115] Advantageously, the outer end of the at least one core can be attached to and / or in at least one brake nipple. Advantageously, the at least 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.

[0116] 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.

[0117] 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.

[0118] 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.

[0119] 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 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.

[0120] 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

[0121] 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 a perspective view of a pluggable wheel assembly with the locking module unlocked; Fig. 4 a perspective view of a pluggable wheel assembly with the swivel mechanism and locking module unlocked; Fig. 5 a perspective view of a pluggable wheel assembly in a second plug-in position; Fig. 6 a top view of a pluggable wheel assembly with a brake unit; Fig. 7 a top view of a pluggable wheel assembly with a focus on the locking module;

[0122] 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

[0123] Fig. 1Figure 1 shows a perspective view of a rollator 100 with pluggable wheel assemblies according to the invention. It can be seen that the rollator 100 has four profile strips (2.1; 2.2; 2.3; 2.4) and four wheels (1.1; 1.2; 1.3; 1.4). The brake unit described below is not shown here. In the advantageous embodiment shown, the rear wheels 1.3 and 1.4 are designed as pluggable wheel assemblies.

[0124] Fig. 2 Figure 1 shows a perspective view of the pluggable wheel assembly in an advantageous embodiment of the invention with brake unit 11, which is open and thus does not depict a braking process. 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 profile tube.

[0125] It is further shown that the plug axle 3 can be inserted through the through-opening (not marked 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.

[0126] Furthermore, the receptacle 5 of the profile strip 2.1 is arranged and also has a through-opening (not marked 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 receptacle 5, but is concealed within it.

[0127] Furthermore, an additional countersink is shown, which is drilled, for example, on two opposite sides of the receptacle 5 and has a larger diameter than the through-hole (not marked here). The countersink is arranged concentrically to the through-hole (not marked here). In the illustrated embodiment of the invention, the cylindrical surface of the countersink extends from the surface of the respective side of the receptacle 5 towards the profile strip 2.1. In the illustrated embodiment of the invention, the receptacle 5 is arranged on the profile strip 2.1 such that it is mounted flush or almost flush with an outer end of the profile strip 2.1.

[0128] 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 in this advantageous embodiment is designed as a spring button or push button.

[0129] The spacer bushing 6 is positively engaged in the recess of the receptacle 5, which is 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 receptacle 5, thus enabling free rotation of the wheel 1.1.

[0130] In this advantageous embodiment of the invention, the wheel 1.1 is connected to the stub axle 3 via the bearing 9.1 and the bearing 9.2. The inner diameter of the bearing 9.1 and the bearing 9.2 is nearly equal to the outer diameter of the stub 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 bearing 9.1 or the bearing 9.2 to the outer diameter of the stub axle 3. The precise relationships are known to those skilled in the art and are therefore not described in detail here.

[0131] Using a hexagonal nut (not shown here), the wheel 1.1 is mounted on the axle 3 between the spacer bushing 6 and the hexagonal nut (not shown here) on the bearing surfaces of the bearing 9.1 and the bearing 9.2, taking into account the longitudinal play of the wheel 1.1 relative to the spacer bushing 6 and / or the mount 5 and / or the profile strip 2.1.

[0132] 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 6 and / or the mount 5 and / or the profile strip 2.1.

[0133] The wheel assembly also includes a brake unit 11, with which the wheel 1.1 can be braked as needed. The brake unit 11 shown is formed in multiple parts, consisting of a brake sleeve 13 with a brake shoe 12 attached to it. The brake shoe 12 is aligned with the profile strip 2.1, in particular the retaining sleeve 21, above the wheel 1.1 and is held by the brake sleeve 13. Furthermore, the brake unit 11 is mounted on a retaining sleeve 21, which is attached to the profile strip 2.1. The brake sleeve 13 is also in a first sliding position.

[0134] Furthermore, the brake unit 11 is rotatable about the axial axis of rotation (not shown) of the profile strip 2.1, wherein the retaining sleeve 21 in combination with the brake sleeve 13 is designed as a pivoting mechanism with a locking function, whereby locking is enabled by a positive fit between the retaining sleeve 21 and the brake sleeve 13. The axial axis of rotation (not shown here) is designed as the intersection axis of the at least two axes of symmetry of the at least one profile strip 2.1 in the longitudinal extent of the at least one profile strip 2.1.

[0135] This retaining sleeve 21 has a multi-part outer shape. In the advantageous embodiment shown, it is formed by a circular shape followed by a transition to a polygonal shape. The brake sleeve 13, which is advantageously shorter in its longitudinal extent than the retaining sleeve 21, is slid onto this retaining sleeve 21, the inner shape of which follows the outer shape of the profile strip 2.1 and which is pushed onto the profile strip 2.1 and held in position by a retaining pin 22. The inner shape of the brake sleeve is rectangular and can be easily slid over the circular portion of the retaining sleeve 21. Also shown are a sheath 14, which encloses the inner tube (not marked here) up to the brake shoe 12, and a spiral spring (not marked here), which encloses the inner tube (not marked here) from the brake shoe 12 to the ring with brake nipple 17.The ring with brake nipple 17 consists of a receptacle for the inner tube (not shown here) and a circular ring that is rotatably attached to the lower end of the retaining sleeve 21. This allows the ring with brake nipple 17 to follow the rotational movement of the brake sleeve 13.

[0136] In Fig. 3 A perspective view of a pluggable wheel assembly with the locking mechanism and / or locking module with brake unit unlocked is shown. The assembly is open, so no braking process is depicted. The plug-in axle 3 is already outside the through-opening 7 and has not yet been moved into the second plug-in position of the wheel (not shown here), which is opposite the first plug-in position. The profile strip 2.1 and the locking unit 4 are analogous to... Fig. 2 designed as a profile tube and as a spring button or push button. The receptacle 5 and the spacer bushing 6 are also designed as already described in Fig. 2As explained, the components are arranged on the profile strip 2.1 and the plug-in axle 3, respectively. The same applies to the brake unit (not marked here), the inner tube 16 shown here, the ring with brake nipple 17, and the coil spring 15. The through-opening 7 is clearly visible here when the plug-in axle 3 is removed during the transfer process from a first plug-in position to a second plug-in position.

[0137] In Fig. 4 Figure 1 shows a perspective view of a pluggable wheel assembly with the locking mechanism and / or locking module unlocked and the brake sleeve 13 unlocked. The brake sleeve is displaced along the retaining collar 21, and in this position, the brake unit can be rotated or pivoted. The brake unit is closed, thus representing a braking process. The pluggable wheel assembly is almost identical to the one shown in Figure 2. Fig. 3The embodiment shown is designed accordingly. However, here the brake sleeve 13 has been moved into a second sliding position. This can only be achieved if the locking mechanism and / or the locking module is unlocked and the wheel 1.1, together with the axle 3, is removed from the profile strip 2.1 and the receptacle 5. Furthermore, the polygonal section of the retaining sleeve 21 is clearly visible.

[0138] In Fig. 5Figure 1 shows a perspective view of the pluggable wheel assembly in a second plug-in position. The release unit 8, which in this advantageous embodiment is designed as a spring button or push button, the wheel 1.1, the brake shoe 12, the profile strip 2.1, and the sleeve 14 of the inner tube (not marked here) are shown. The brake sleeve 13, which has been moved into its first sliding position, is also indicated. A retaining unit 23 for the sleeve 14 is also visible, which in this advantageous embodiment is designed as a clip. The inner shape of the retaining unit 23 corresponds to the outer shape of the profile strip 2.1, and in this advantageous embodiment, it is clipped or slid onto the profile strip 2.1.

[0139] About the Figs. 2 to 5 is the plug-in process from a first plug position, as in Fig. 2The illustration shows how to move the wheel assembly in a second insertion position by sliding the brake sleeve 13 along the retaining sleeve 21 from an unlocked state of the locking mechanism and / or locking module and an unlocked state of the brake sleeve 13. This allows, for example, a rollator (not shown) or stroller (not shown) to be moved from a first insertion position of the wheel, which creates a wide track width for safety on uneven terrain, to a second insertion position of the wheel with a narrower track width. This narrower position allows passage through doorways less than 80 cm wide and is therefore suitable for indoor use.

[0140] Fig. 6Figure 1 shows a top view of a pluggable wheel assembly with a brake unit (not marked here). The plug-in connection is clearly visible. The plug-in axle 3 is inserted through the wheel (indicated here only by the wheel hub 20) and the receptacle 5, which is positioned on the profile strip 2.1. In this advantageous embodiment, the invention features a countersink on each side of the receptacle 5, concentric to the through-opening (not marked here). This allows the spacer bushing 6 to be positively engaged with the receptacle 5. The locking unit 4 is also shown, which in this advantageous embodiment is designed as a spring-loaded button or push button.

[0141] It is also evident that a fit is formed between the outer diameter of the plug shaft 3 and the through opening (not marked here) of the receptacle 5 and the profile strip 2.1.

[0142] Furthermore, bearings 9.1 and 9.2, located on the axle 3 and in the wheel hub 20, are visible. The release unit 8 is designed here as a spring-loaded button or push button. The combination of the hexagonal nut 10 and the external thread 18, used to adjust the longitudinal play of the wheel (indicated here only by the wheel hub 20) and the receptacle 5, is also shown. Additionally, the sleeve 14 is shown inserted into the brake shoe 12. Recesses in the brake shoe 12 and the ring with brake nipple 17, which serve as a retainer for the coil spring 15, are also shown.

[0143] Fig. 7 Shows a top view of a pluggable wheel assembly with a focus on the locking mechanism and / or the locking module. The construction of the plug connection is shown almost analogously to Fig. 5The bearings 9.1 and 9.2, which support the wheel (indicated here only by the wheel hub 20) on the axle 3, are clearly visible. Furthermore, in this advantageous embodiment, the release unit 8 is shown as a spring-loaded button or push button, with which the locking mechanism and / or the locking module can be moved into an unlocked state. In addition, the Fig. 5 The described hexagonal nut 10 and the external thread 18, which is formed at the outer end of the axle 3 on the side of the axle 3 facing the wheel (indicated here only by the wheel hub 20), are clearly visible here. Furthermore, the spacer bushing 6, which distances the wheel (indicated here only by the wheel hub 20) from the receptacle 5 and according to the profile strip 2.1, is shown.

[0144] Although the invention has been further illustrated and described in detail by the advantageous embodiments, the invention is not limited by the disclosed examples. Other variations can be derived from them by a person skilled in the art without departing from the scope of protection of the invention. Reference symbol list

[0145] 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 Mount 6 Spacer bushing 7 Through opening 8 Release unit 9.1, 9.2 Bearing 10 Hex nut 11 Brake unit 12 Brake shoe 13 Brake sleeve 14 Sleeve 15 Coil spring 16 Core 17 Ring with brake nipple 18 External thread 20 Wheel hub 21 Retaining sleeve 22 Retaining pin 23 Retaining unit 100 Rollator

Claims

1. Plug-in wheel assembly having 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), at least one mounting (5), wherein the at least one wheel (1.1; 1.2; 1.3; 1.4) is formed to be connectable with the at least one thru axle (3), wherein the at least one latching unit (4) is arranged at the at least one thru axle (3), wherein the at least one profile strip (2.1; 2.2; 2.3; 2.4) and the at least one mounting (5) have at least one passage opening (7) perpendicular to the mantle 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 able to be plugged through the at least one passage opening (7) of the at least one profile strip (2.1; 2.2; 2.3; 2.4) and the at least one mounting (5), wherein the at least one thru axle (3) is lockable to 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), wherein the at least one mounting (5) is arranged at the at least one profile strip (2.1; 2.2; 2.3; 2.4), wherein the at least one mounting (5) at the at least one profile strip (2.1; 2.2; 2.3; 2.4) is formed at each side of the at least one passage opening (7) of the at least one profile strip (2.1; 2.2; 2.3; 2.4), characterized in that, the wheel assembly has at least one limit stop, wherein the at least one limit stop is arranged on the at least one thru axle.

2. Plug-in wheel assembly according to patent claim 1, characterized in that, the at least one latching unit (4) and the at least one mounting (5) form a latching and / or are designed as latching module.

3. Plug-in wheel assembly according to patent claim 1, characterized in that, the at least one wheel (1.1; 1.2; 1.3; 1.4) with the at least one thru axle (3) is pluggable from each side of the profile strip (2.1; 2.2; 2.3; 2.4) into the each one passage opening (7) of the at least one profile strip (2.1; 2.2; 2.3; 2.4) and the at least one mounting (5), by which the at least one wheel (1.1; 1.2; 1.3; 1.4) is transferable into a first plugged position and a second plugged position, and / or wherein a change of the track width is effectable via re-plugging of the at least one wheel (1.1; 1.2; 1.3; 1.4) is from a first plugged position to a second plugged position and / or vice versa.

4. Plug-in wheel assembly according to patent claim 1, characterized in that, the at least one latching and / or the at least one latching module, which is arranged at the thru axle (3), is designed to be self-locking.

5. Plug-in wheel assembly according to patent claim 1, characterized in that, the at least one latching unit (4) is arranged at the opposing side to the at least one wheel (1.1; 1.2; 1.3; 1.4) at the at least one thru axle (3).

6. Plug-in wheel assembly according to patent claim 1, characterized in that, the at least one limit stop is arranged at the side facing the at least one wheel (1.1; 1.2; 1.3; 1.4) of the at least one thru axle (3), 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 mounting (5).

7. Plug-in wheel assembly according to patent claims 1 or 5, characterized in that, the at least one limit stop is designed in such a way that the at least one thru axle (3) does not protrude laterally to the profile strip (2.1; 2.2; 2.3; 2.4) and the mounting (5) in every plugged position.

8. Plug-in wheel assembly according to patent claim 1, characterized in that, the at least one mounting (5) has at least one circumferential ring groove in the mantle surface of the at least one passage opening (7) in the form of the at least one latching unit (4).

9. Plug-in wheel assembly according to patent claim 1, characterized in that, the at least one mounting (5) is arranged on the at least one profile strip (2.1; 2.2; 2.3; 2.4) at the outer end of the at least one profile strip (2.1; 2.2; 2.3; 2.4) succinctly and / or symmetrically and / or concentrically to the at least one passage opening (7).

10. Plug-in wheel assembly according to patent claim 1, 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.

11. Rollator (100), having at least four profile strips (2.1; 2.2; 2.3; 2.4), at least four 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 1 to 10, wherein with the at least one plug-in wheel assembly a change of track width of the rollator is effectable.

12. Rollator (100) according to patent claim 11, characterized in that, at least one breaking unit (11) is arranged at an at least one holding sleeve (21), wherein the at least one holding sleeve (21) is arranged at the at least one profile strip (2.1; 2.2; 2.3; 2.4).

13. Rollator (100) according to patent claim 11, characterized in that, the at least one breaking unit (11) is designed to be rotatable around the axial axis of rotation of the at least one profile strip (2.1; 2.2; 2.3; 2.4), wherein the at least one holding sleeve (21) is designed as additional latching unit.

14. Rollator (100) according to patent claim 11, characterized in that, the at least one breaking unit (11) has at least one break sleeve (13) with at least one brake shoe (12), which is arranged thereon.

15. Rollator (100) according to patent claim 14, characterized in that, the at least one brake sleeve (13) is movable by application of tensile force via at least one brake line, wherein the at least one brake line is designed as Bowden wire and comprises at least one core (16) and at least one sheath (14).