Cleaning device

Abstract

The invention relates to a cleaning device, in particular in the form of a spray extraction device, comprising a cleaning device body, wherein a suction device, at least one liquid container for receiving dirty water sucked in by the suction device, and a travel device having at least one wheel are mounted or formed on the cleaning device body, the travel device defines a standing plane protruding beyond the lower face of the cleaning device body, and the suction device is positioned between the standing plane and the at least one liquid container.

Description

[0001] A 501 244 z Applicant: Alfred Kärcher SE & Co. KG

[0002] October 17, 2025 Alfred-Kärcher-Strasse 28 - 40 z-390 / 415 71364 Winnenden

[0003] Cleaning device

[0004] The invention relates to a cleaning device, in particular in the form of a spray extraction device, comprising a cleaning device body, wherein a suction device, at least one liquid container for receiving a dirty water liquor sucked up with the suction device and a transport device with at least one wheel are arranged or formed on the cleaning device body, wherein the transport device defines a support level projecting beyond an underside of the cleaning device body.

[0005] Cleaning devices of the type described above are particularly known in the form of sled devices. Rollers are arranged on the underside of a generally cuboid cleaning device body, allowing the user to pull the device behind them during cleaning.

[0006] DE 41 38 529 A1 discloses a cleaning device, particularly for cleaning carpets and upholstered surfaces. DE 27 29 399 A1 describes a cleaning machine, especially for wet cleaning. A multifunctional cleaning machine is disclosed in US 6,206,980 B1. DE 100 16 287 A1 relates to an escalator and moving walkway cleaning device.

[0007] One object of the present invention is to improve a cleaning device of the type described above in such a way that it is particularly suitable for use in the area of ​​small contact surfaces, for example stairs.

[0008] This problem is solved according to the invention in a cleaning device of the type described above by positioning the suction device between the base and the at least one liquid container. A 501 244 z

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[0011] An arrangement of the suction device and the at least one liquid container relative to each other, as proposed, allows the cleaning device to be designed in such a way that it requires only a small footprint compared to a sled-type device. For example, the cleaning device can be placed on a stair step when used in stairwells. The arrangement of the suction device between the base and the at least one liquid container thus allows the cleaning device to be designed vertically. The device height is preferably greater than any dimension of the cleaning device in a direction perpendicular to its height. The compact, vertical design of the cleaning device also makes it easy to carry, as the center of gravity of the cleaning device is positioned closer to the user's body when the user is carrying it.

[0012] It is advantageous if the cleaning device body has a device top that runs parallel or substantially parallel to the device bottom and / or to the support plane, if the cleaning device body defines a vertical axis that runs transversely, in particular perpendicularly, to the support plane, if a device height parallel to the vertical axis corresponds to a distance of the device top from the support plane, and if the device height is greater than both a device length and a device width of the cleaning device body in any section plane transversely, in particular perpendicularly, to the vertical axis.

[0013] This design of the cleaning device makes it possible, in particular, to achieve a significantly smaller footprint than with known sled-type devices. The footprint is defined by an area limited by the device's width and length. The cleaning device body can then be dimensioned so that its length or width is no larger than a standard stair tread, allowing the device to be placed on stairs. This significantly simplifies cleaning tasks on stairs, as the user does not need to hold the device while cleaning but can simply place it on a stair tread. A 501 244 z

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[0016] It is advantageous if the device width is defined as the distance between two opposing sides of the device, and if the device length is defined as the distance between the front of the device and the rear of the device pointing away from the front. The cleaning device body and the cleaning device itself can thus be designed in a largely cuboid shape. This allows for the most compact design possible. The sides of the device can be perpendicular to the front or rear of the device, as well as perpendicular to the top or bottom of the device.

[0017] For a compact design of the cleaning device, it is particularly advantageous if a cutting plane of the cleaning device, which includes a front upper edge formed between the front and top of the device and a rear lower edge formed between the back and bottom of the device, intersects the transport mechanism, the suction device, and the at least one liquid container. In particular, the cutting plane can intersect large wheels enclosed by the transport mechanism, enabling the cleaning device to be designed in the form of a compact trolley. The described cutting plane defines a diagonal plane of the cleaning device.

[0018] It is advantageous if the cleaning device body is cuboid or substantially cuboid in shape, and if the front of the device is aligned parallel or substantially parallel to the rear, and if the two sides of the device are aligned parallel or substantially parallel to each other. This design allows for a particularly compact construction of the cleaning device.

[0019] To improve handling of the cleaning device, it is advantageous if the distance between the center of gravity of the cleaning device body and the rear is smaller than the distance from the front. (User A 501 244 z)

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[0021] - 4 - can then carry the cleaning device particularly easily if he holds it with the back of the device towards his body.

[0022] For handling the cleaning device, it is advantageous if the transport mechanism includes at least two wheels. In particular, it can also include three or four wheels. Three or four wheels make it possible, in particular, to pull the cleaning device along behind you like a sled during use.

[0023] To improve the maneuverability of the cleaning device, it is advantageous if at least one wheel is steerable. In particular, two wheels can also be steerable. This design makes it possible, in particular, to rotate the cleaning device on the spot on a surface without having to lift it.

[0024] Advantageously, the at least two wheels are designed as casters and define a common wheel axis that runs parallel to the base and in the direction of the device's width. This allows, in particular, a cleaning device to be designed in the form of a trolley. Specifically, the two casters can be positioned near the rear lower edge. This allows the cleaning device to be easily pivoted around the wheel axis. When pulling the cleaning device, the center of gravity can then be shifted around the wheel axis, improving handling.

[0025] It is advantageous if the cleaning device body has a defined front and rear, and if the two wheels protrude at least partially from both the underside and the rear of the device. This design particularly facilitates pulling the cleaning device up stairs with its rear facing the steps. Furthermore, as described, the cleaning device body can be easily pivoted around the wheel axis to adjust the position.

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[0027] - 5 - to swivel the standing cleaning device into a slightly tilted transport position in which the center of gravity of the cleaning device is positioned above the wheel axle.

[0028] A compact design of the cleaning device is made possible in particular by the fact that the suction unit includes a fan with a driven impeller for conveying air, and that the impeller is arranged or configured between the impeller axis and the at least one liquid container. The essential components of the cleaning device, namely the at least one liquid container and the suction unit, can thus be practically stacked on top of each other within or on the cleaning device body.

[0029] A particularly low center of gravity of the cleaning device can be achieved if the fan drive of the impeller is arranged or designed between the two impellers. In particular, the impeller axis can intersect the fan drive.

[0030] For handling the cleaning device, especially when carrying it, it is advantageous if a perpendicular projection of the impellers onto the base plane defines an impeller projection area, and if a perpendicular projection of the center of gravity of the cleaning device body onto the base plane lies within the impeller projection area. This condition can be met whether the at least one liquid container is filled or empty.

[0031] For improved handling of the cleaning device, it is advantageous if it can be pivoted from a stationary position, in which the base is perpendicular to the direction of gravity, about the impeller axis into a pulling position, and if the center of gravity of the cleaning device body is positioned above or substantially above the impeller axis in the pulling position. This allows the cleaning device to be pulled and maneuvered easily. A 501 244 z

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[0034] Furthermore, it can be advantageous if the transport device comprises two wheels in the form of swivel casters, which project at least partially beyond the underside of the device, if the swivel casters define axes parallel to the ground plane, and if the swivel casters are rotatable about axes parallel or substantially parallel to the vertical axis. With such a transport device, it is particularly possible to rotate the cleaning device on the spot, especially in the described stationary position. Preferably, the diameters of the swivel casters are significantly smaller than the diameters of the running wheels, preferably at least three times smaller.

[0035] For ease of use of the cleaning device, it is advantageous if at least one liquid container forms at least part of the top of the device. This allows it to be removed from the cleaning device, particularly by lifting it upwards.

[0036] Advantageously, the at least one liquid container forms at least part of the front of the device. This allows the user to directly see the fill level of the at least one liquid container. Furthermore, the at least one liquid container can also be easily removed from the cleaning device body.

[0037] Advantageously, at least one liquid container is designed in the form of a dirty water tank. Such a design makes it possible, in particular, to configure the cleaning device as a vacuum cleaner, especially as a wet or dry vacuum cleaner.

[0038] For a compact design of the cleaning unit with the smallest possible footprint, it is advantageous to have a dirty water inlet and an air outlet located or formed on the bottom of the dirty water tank. With this design, the dirty water is drawn into the dirty water tank from below. Exhaust air from the A 501 244 z

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[0041] The wastewater from the wastewater tank is then drained through the air outlet in the bottom of the wastewater tank.

[0042] According to a further preferred embodiment, the cleaning device may comprise two liquid containers, one of which is a fresh water container. Such a cleaning device may, in particular, be designed as a spray extraction device. The fresh water container may be used, in particular, to hold fresh water for application to the surface to be cleaned. The cleaning device can then draw up a dirty solution consisting of dirt and cleaning fluid and collect it in the dirty water container.

[0043] To allow filling of the fresh water tank without having to remove the dirty water tank from the cleaning machine body, it is advantageous if the fresh water tank forms part of the front of the machine. It can then be removed from the cleaning machine body by sliding it forward.

[0044] Furthermore, it is advantageous if the wastewater tank has at least one recess for a positive-locking or substantially positive-locking engagement with a corresponding projection on the fresh water tank. In particular, the wastewater tank can have two recesses and the fresh water tank two corresponding projections. This particular design makes it possible, in particular, to tilt the fresh water tank 90° relative to its orientation for filling when it is properly mounted on the cleaning device. Specifically, the projections on the fresh water tank can point towards the rear of the device. During filling, they can then be aligned against the direction of gravity.

[0045] It is advantageous if the fresh water tank has a filling opening and if the filling opening faces towards the waste water tank A 501 244 z

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[0047] - 8 - This design makes it possible, in particular, to position the fresh water tank and the dirty water tank side by side on the cleaning device body. For filling, the fresh water tank can then be rotated by 90° so that the filling opening points against the direction of gravity.

[0048] Preferably, the filling opening is arranged or formed between the projections of the fresh water tank. This allows, in particular, the fresh water tank to be filled in such a way that the filling opening points against the direction of gravity during filling. The fresh water tank can thus be filled in a quasi-horizontal position. If the filling opening is accidentally not closed with the sealing element and the fresh water tank is swung back into an upright position, the at least one projection, or at least two projections forming bulges of the fresh water tank, allow the filled fresh water to be contained, preventing it from leaking out of the filling opening.

[0049] It is advantageous if the two liquid containers are designed to be detachably connected to each other, and if, in a separating position, the two liquid containers are completely separated from each other and coupled together in a working position. This design makes it particularly possible to handle the two liquid containers together, for example, to remove them together from the cleaning device body.

[0050] Preferably, the wastewater tank overlaps the fresh water tank at least partially, and in particular completely, in the working position. This design allows for a particularly compact construction of the cleaning device. For example, the space above the fresh water tank can be used by the wastewater tank to accommodate a separator or a separation stage of a separator. The separator allows liquid or solid components of the dirty water to be separated from gaseous components. A 501 244 z

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[0053] Furthermore, it is advantageous if the cleaning device comprises a liquid container coupling device for coupling the two liquid containers, with first and second coupling elements arranged or formed on the two liquid containers. These coupling elements are disengaged in the separation position and are engaged in a force-fit and / or form-fit manner in the working position. The coupling elements can, in particular, be corresponding projections and recesses. At least one coupling element can be movably arranged or designed, for example, in the form of a pivoting latch, which enables quick and easy separation or coupling of the two liquid containers from each other.

[0054] For a compact design of the cleaning device, it is advantageous to have a fresh water outlet located or formed at the bottom of the fresh water tank. The fresh water outlet can be closed, in particular, by a valve. The valve can be opened automatically, especially if the fresh water tank is located on the cleaning device body. The positioning of the fresh water outlet makes it possible, in particular, to partially utilize gravity to draw the fresh water from the fresh water tank.

[0055] For ease of use of the cleaning device, it is advantageous if the at least one liquid container includes a container handle that can be pivoted around a pivot axis running parallel to the base. The container handle can thus assume a first position in a transport or working position and then, for carrying, be pivoted over the at least one liquid container, for example, against the direction of gravity.

[0056] Preferably, the container carrying handle is arranged or integrated into the dirty water tank. If the cleaning device includes only a dirty water tank and no fresh water tank, the dirty water tank can be designed as follows: A 501 244 z

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[0058] - 10 - can be easily removed from the cleaning unit body, for example, to empty the collected cleaning solution. If the cleaning unit includes two liquid containers, the container carrying handle can also be used to handle both liquid containers together, for example, if they can be connected. In the connected working position, they can then be removed from the cleaning unit body together by one user.

[0059] It is advantageous if the container handle includes at least one locking element that engages with the cleaning device body in a locked position, either force-fit or form-fit. The container handle can thus perform a dual function. Firstly, it can be used to handle the at least one liquid container. Secondly, it can secure the container to the cleaning device by engaging the handle's locking element with the cleaning device body in the locked position. To engage the locking element, the container handle can, for example, be pivoted. This allows the liquid container to be easily locked to the cleaning device body and unlocked again by pivoting the container handle back into its original position.

[0060] It is advantageous if the container carrying handle includes a grip section extending parallel to the base, which, in the locked position, covers the at least one liquid container on the front of the device. This makes it immediately apparent to the user that the at least one liquid container is secured to the cleaning device body. The grip section then runs along the front of the device.

[0061] According to a further preferred embodiment, the at least one liquid container may include a separator for separating liquid and gaseous components of the dirty water drawn in by the cleaning device. Such a design particularly allows for a compact construction of the cleaning device. In addition, the separator can be cleaned easily. A 501 244 z

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[0064] Ideally, the separation device is located or integrated within the wastewater tank. This allows the vacuumed wastewater to be separated directly within the tank into liquid / solid and gaseous components.

[0065] It is advantageous if the separation system comprises at least one separation stage. Optionally, it can also include two separation stages. Two separation stages offer the particular advantage of ensuring reliable separation of liquid and gaseous components, thus preventing virtually any liquid components from entering the suction system.

[0066] To empty the at least one liquid container, it is advantageous if it includes a container lid and if the container lid forms part of the container's top surface. This allows the container lid to be easily removed for emptying.

[0067] A compact design of the cleaning device can be achieved, in particular, by integrating the separation device at least partially into the container lid. Specifically, deflection elements can be integrated into the container lid to enable the separation of liquid and gaseous components of the cleaning solution by utilizing inertia.

[0068] According to a further preferred embodiment, the cleaning device may include a cleaning hose and a hose connection may be arranged on or in the area of ​​the front of the device for permanent or detachable connection to the cleaning hose. The cleaning hose may, in particular, be permanently attached to the cleaning device body. In this case, it is not intended to detach the cleaning hose from the cleaning device body. Alternatively, the cleaning hose may also be detachable. In this case, it can be detachably connected to the hose connection. A 501 244 z

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[0071] Preferably, the hose connection specifies a connection direction that forms an angle greater than 0° with the surface it is mounted on. In particular, the angle can be in a range between 0° and approximately 45°. This reduces the risk of the cleaning device hose kinking in the area of ​​the hose connection.

[0072] To prevent the cleaning hose from kinking at the cleaning device body, it is advantageous if the hose connection is recessed into the cleaning device body opposite the front of the device. This also protects the hose connection from external influences.

[0073] Preferably, the hose connection is routed or positioned below the at least one liquid container. This allows, for example, a dirty solution to be easily introduced into the dirty water container from below.

[0074] To enable the cleaning device to be used on stairs, it is advantageous if the distance between the hose connection and the standing surface is greater than the stair pitch defined in DIN 18065. Specifically, the distance can be greater than 14 cm. Furthermore, it can be greater than at least 20 cm. This allows the cleaning device to be placed on a stair step. The cleaning hose then exits the device body above the next step. This ensures that the cleaning device remains stable on a stair step.

[0075] Preferably, the distance between the hose connection and the surface on which the unit is placed is at least approximately one-third of the unit's height. This ensures, in particular, that the cleaning unit hose exits the unit above the next higher step when the unit is placed on a step. A 501 244 z

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[0078] Conveniently, a recess is provided on the underside of the fresh water tank to accommodate at least part of the cleaning unit hose and / or hose connector. This allows the cleaning unit hose to be routed into the cleaning unit body below the fresh water tank. The hose connector can then be easily and effectively connected to the dirty water inlet located in the bottom of the dirty water tank.

[0079] According to a further preferred embodiment, the cleaning device body may include a liquid container receptacle for receiving the at least one liquid container in an operating position of the cleaning device, and the liquid container receptacle may be open towards the top of the device. Such a design of the cleaning device allows for easy handling of the at least one liquid container, in particular for removing it from and inserting it into the liquid container receptacle.

[0080] Conveniently, the liquid container holder is open towards the front of the device. This makes it easier to insert and remove the at least one liquid container from the holder.

[0081] Furthermore, it is advantageous if the liquid container opening is open towards the sides of the device. This allows, in particular, the fill level of the at least one liquid container to be seen even when looking at one side of the device, provided that the at least one liquid container is at least partially made of a transparent or translucent material.

[0082] For the cleaning device to function properly, it is advantageous if the dirty water inlet is fluidly connected to the hose connection A 501 244 z

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[0084] - 14 - and when the air outlet is fluidly connected to a suction-side suction inlet of the suction device. This design makes it possible, in particular, to draw a dirty water solution into the dirty water container through the hose connection using the suction device.

[0085] Preferably, a pressure-side suction outlet of the suction device is fluidly connected to an exhaust air outlet of the cleaning device. After the wastewater has passed through the container, the exhaust air can thus be reliably discharged from the cleaning device.

[0086] Advantageously, a filter device is arranged or integrated between the suction outlet and the exhaust air outlet. This makes it possible to filter out airborne particles from the exhaust air stream. The filter device can, in particular, include an odor filter to prevent unpleasant odors during operation of the cleaning device.

[0087] It is advantageous if the filter system includes at least one filter element. In particular, the filter element can be in the form of an activated carbon filter. An activated carbon filter is especially effective at filtering out and binding unpleasant odors from the exhaust air stream of the cleaning device.

[0088] Preferably, the exhaust air outlet is located or designed on the underside of the device. This makes it possible, in particular, to direct the exhaust air flow out of the bottom of the cleaning device. This prevents the user from being blown directly into the air.

[0089] According to a further preferred embodiment, the cleaning device body may include a suction chamber, the suction device is housed in the suction chamber, and the at least one liquid container is arranged above the suction chamber. Such a design particularly enables the A 501 244 z

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[0091] - 15 - compact design of the cleaning device. In particular, the suction unit, which includes, for example, an electric motor as a drive, can be positioned as low as possible on the cleaning device to keep its center of gravity as low as possible. In addition, the provision of the suction unit chamber allows different components of the cleaning device to be easily separated and housed separately within the cleaning device body.

[0092] Furthermore, it can be advantageous if the cleaning device body includes a technical chamber for housing, in particular, a control and / or regulating device of the cleaning device. In particular, the technical chamber can be arranged or designed adjacent to the rear of the device. Specifically, electrical and electronic components of the cleaning device that should not come into contact with liquid can be protected within the technical chamber.

[0093] Preferably, the technical chamber is arranged or configured above the suction chamber. In this way, the footprint can be further reduced.

[0094] It is advantageous if the technical chamber is adjacent to the at least one liquid container in its operating position. The technical chamber can then also serve to position the at least one liquid container, for example, if it is held in the liquid container holder.

[0095] It is advantageous if a cleaning agent container and / or a cleaning device dosing unit are housed in the technical compartment. A cleaning agent container can, in particular, serve to hold a cleaning agent which can be added by the cleaning device to the fresh water before being applied to a surface to be cleaned and dosed accordingly by the cleaning agent dosing unit. See, in particular, A 501 244 z

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[0097] - 16 - The dosage can be set by a user at the cleaning agent dosing device. This allows cleaning tasks to be reliably completed. In particular, suitable cleaning agents can be provided for different cleaning tasks, depending especially on the material of the surfaces to be cleaned with the cleaning device.

[0098] It is advantageous if the cleaning agent container is removable from the technical compartment. This makes it easy to refill the cleaning agent container when it is removed from the technical compartment.

[0099] Preferably, the technical chamber forms part of the top of the device. This allows components of the cleaning device to be arranged on the top of the device, even if they need to be directly or indirectly connected to components housed in the technical chamber. For example, a main switch can be positioned directly on top of the technical chamber on the top of the device.

[0100] It is also advantageous if a fresh water pump and / or a cleaning agent pump are housed in the technical compartment. This allows these components to be reliably separated from the suction system and protected within the cleaning machine body.

[0101] For ease of handling the cleaning device, it is advantageous if a hose fastening device is arranged or designed on the cleaning device body for securing a cleaning device hose during transport. The hose fastening device can, in particular, include elastic retaining loops that can be hooked into corresponding projections on the cleaning device.

[0102] For storing small parts and accessories, it is advantageous if an accessory holder is provided or designed on the cleaning device body. A 501 244 z

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[0105] In particular, it can be an elastic or flexible network.

[0106] According to a further preferred embodiment, a cable holding device can be arranged or formed on the cleaning device body. If the cleaning device is designed in the form of a power supply unit and requires a connection cable for connecting to a power grid, the connection cable can be easily and reliably held in the cable holding device when the cleaning device is not in use.

[0107] For ease of use of the cleaning device, it is advantageous if the cable holder comprises two spaced-apart retaining projections and if at least one of the two retaining projections has a locking projection that is rotatable about a longitudinal axis of the projection and projects transversely, in particular vertically, with respect to the longitudinal axis of the projection. In particular, both retaining projections can have such a locking projection. Optionally, only one of the two locking projections can be rotatable on the two retaining projections. The rotatability of the locking projection allows for easy and quick removal of the connecting cable looped around the two retaining projections.

[0108] In principle, it would be conceivable to permanently attach the at least one liquid container to the cleaning device body. However, for ease of use, it is advantageous if the at least one liquid container is detachably connected to the cleaning device body. It can then be easily detached from the cleaning device body, for example, for filling in the case of a fresh water container or for emptying in the case of a dirty water container.

[0109] According to a further preferred embodiment, the cleaning device may include a transport device for moving A 501 244 z

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[0111] - 18 - of the cleaning device by a user. For example, the transport device may be designed to be grasped by a user with one hand. The user can then, for example, push the cleaning device, which includes a transport device, in front of them or pull it behind them.

[0112] For ergonomic handling of the cleaning device, it is advantageous if the transport system includes a backpack carrying system. In particular, the backpack carrying system can be located on or integrated into the back of the device. The cleaning device can then be carried like a backpack, for example, when it needs to be transported over longer distances.

[0113] Furthermore, it is advantageous if the transport device includes a transport handle with a handle section extending parallel to the support surface. The cleaning device can then be grasped by the user at the transport handle, for example, to lift it, pull it behind them, or push it in front of them.

[0114] It is advantageous if a carrying pad, pointing towards the cleaning device body, is attached to or integrated into the transport handle section. This allows the user, in particular, to hang the transport handle over one shoulder, for example, if it is extendable or swiveling on the cleaning device body, thus carrying the cleaning device with less effort. The carrying pad can be equipped with a non-slip surface to prevent or at least hinder slippage, for example, from the user's shoulder, thereby improving handling of the cleaning device during transport.

[0115] Advantageously, the transport handle on the cleaning device body is pivotable or extendable, in particular telescopic. A 501 244 z

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[0118] The transport handle can thus be positioned as close as possible, or even not at all, to the cleaning device body, particularly in a storage position. Preferably, when moving it into a transport position, it can be moved away from the cleaning device body so that the transport handle section is positioned as far away from the cleaning device body as possible.

[0119] It is advantageous if the transport handle, when the cleaning device is in storage position, is pushed as far forward as possible towards the cleaning body or pivoted towards it. This ensures the cleaning device requires as little space as possible when stored.

[0120] It is advantageous if the transport handle defines an extension direction, if this extension direction includes an angle relative to the vertical axis, and if the extension angle has a value in the range of 0° to approximately 25°. In particular, it can have a value in the range of 0° to approximately 15°. Tilting the extension direction relative to the vertical axis has the particular advantage that the transport handle section can protrude beyond the back of the device when extended. This allows a user to, in particular, hang the transport handle over one shoulder and then carry the cleaning device close to their body.

[0121] Preferably, the transport handle is designed or arranged to be extendable from the top of the device near the rear of the cleaning device body. This arrangement allows for easy handling of the cleaning device when moving it, particularly when the wheels are arranged or designed to protrude beyond the rear and underside of the device.

[0122] For carrying the cleaning device, it is advantageous if the transport handle section, when extended, especially in its fully extended transport position, protrudes beyond a level on the back of the device defined by the rear of the device. This allows the cleaning device to be carried ergonomically. The transport handle section can be, for example, shown on A 501 244 z.

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[0124] - 20 - rest on a user's shoulder and the cleaning device body still rests against the user's body when worn.

[0125] Furthermore, it is advantageous if a handle is arranged or formed on the cleaning device body, with a handle section running parallel to the base, and if the transport handle section rests against or abuts the handle section in the storage position. The handle allows the cleaning device to be grasped and, if necessary, carried even when the transport handle is in the storage position. To lift the cleaning device, a user therefore only needs to grasp the handle.

[0126] Furthermore, it is advantageous if the cleaning device includes a stair support device for supporting the cleaning device, when placed on a step, on a lower step. In particular, the stair support device can be designed to support the cleaning device on the next lower step.

[0127] It is advantageous if the stair support device includes an extendable support element, if the support element has at least one support surface running parallel to the surface on which the device is placed, and if this support surface is retracted relative to the surface in the transport position of the cleaning device and projects beyond the surface in the support position. The described design of the stair support device allows the cleaning device, when placed on a step, to be additionally supported on a lower step in a simple and reliable manner, thus preventing it from tipping over unintentionally. The extendable support element can, in particular, have two or more support surfaces. These surfaces can, in particular, be spaced apart from one another.For example, the two support surfaces can define a support plane that runs parallel to the base plane. A 501 244 e.g.

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[0130] It is advantageous if the cleaning device includes a main switch, and if this switch is located on the top of the device. This allows the user to easily activate and deactivate the cleaning device. The cleaning device can be made particularly compact if the main switch is located on the top of the technical compartment.

[0131] Preferably, the cleaning device has a mains connection and can be connected to a power supply via a connection cable. This allows the cleaning device to be used in a mains-powered manner, particularly for continuous operation.

[0132] It is advantageous if the cleaning device includes an electrical energy storage device for operation independent of the mains power supply. This electrical energy storage device can be in the form of a rechargeable battery. The electrical energy storage device can be provided as an alternative to, or in addition to, the mains connection on the cleaning device.

[0133] In order to enable wet cleaning, especially of floors, for example carpets, and textile, air-permeable surfaces such as upholstery of seating furniture or vehicle seats, the cleaning device is preferably designed in the form of a spray extraction device.

[0134] Furthermore, it is advantageous if the cleaning device is designed as a vacuum cleaner. With such a device, dirt can be vacuumed up easily and reliably. A vacuum cleaner, in particular, does not require a fresh water tank.

[0135] The foregoing description thus includes in particular the embodiments of cleaning devices defined below in the form of numbered sentences: A 501 244 z

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[0138] 1. Cleaning device (10), in particular in the form of a spray extraction device (12), comprising a cleaning device body (14), wherein a suction device (16), at least one liquid container (18) for receiving a dirty water liquor sucked up with the suction device (16) and a transport device (20) with at least one wheel (22) are arranged or formed on the cleaning device body (14), wherein the transport device (20) defines a support level (24) projecting above an underside (26) of the cleaning device body (14), characterized in that the suction device (16) is positioned between the support level (24) and the at least one liquid container (18).

[0139] 2. Cleaning device according to sentence 1, in particular according to the preamble of sentence 1, characterized in that the cleaning device body (14) has a device top (28) which runs parallel or substantially parallel to the device bottom (26) and / or to the support plane (24), that the cleaning device body (14) defines a vertical axis (30) which runs transversely, in particular perpendicularly, to the support plane (24), that a device height (24) parallel to the vertical axis (30) corresponds to a distance (36) of the device top (28) from the support plane (24), and that the device height (34) is greater than both a device length (42) and a device width (40) of the cleaning device body (14) in any section plane transversely, in particular perpendicularly, to the vertical axis (30).

[0140] 3. Cleaning device according to sentence 2, characterized in that the device width (40) is defined as a distance between two device sides (44, 46) pointing away from each other and that the device length (42) is defined as a distance between a device front (48) and a device rear (50) pointing away from the device front (48).

[0141] 4. Cleaning device according to sentence 3, characterized in that a cutting plane (56) of the cleaning device (10), which is between the A 501 244 z

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[0143] - 23 -

[0144] The front upper edge (52) formed between the front of the device (48) and the top of the device (28) and a rear lower edge (54) formed between the rear of the device (50) and the bottom of the device (26) intersects the drive mechanism (20), the suction device (16) and the at least one liquid container (18).

[0145] 5. Cleaning device according to sentence 3 or 4, characterized in that the cleaning device body (14) is cuboid or substantially cuboid and that the front of the device (48) is aligned parallel or substantially parallel to the rear of the device (50) and that the two sides of the device (44, 46) are aligned parallel or substantially parallel to each other.

[0146] 6. Cleaning device according to one of sentences 3 to 5, characterized in that a distance (60, 62) of the center of gravity (58) of the cleaning device body (14) from the rear of the device (50) is smaller than from the front of the device (48).

[0147] 7. Cleaning device according to one of the preceding sentences, characterized in that the driving device (20) comprises at least two wheels (22), in particular at least three or four wheels (22).

[0148] 8. Cleaning device according to sentence 7, characterized in that at least one wheel (22), in particular two wheels (22), are designed to be steerable.

[0149] 9. Cleaning device according to sentence 7 or 8, characterized in that at least two wheels (22) are designed in the form of running wheels (70) and define a common running wheel axis (72) which runs parallel to the support plane (24) and in the direction of the device width (40).

[0150] 10. Cleaning device according to sentence 9, characterized in that the cleaning device body (14) has a device front (48) and a device rear A 501 244 z

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[0152] - 24 -

[0153] page (50) is defined and that the two wheels (70) protrude at least partially from both the underside (26) and the rear (50) of the device.

[0154] 11. Cleaning device according to sentence 9 or 10, characterized in that the suction device (16) comprises a fan (78) with a driven fan impeller (80) for conveying air and that the fan impeller (80) is arranged or formed between the impeller axis (72) and the at least one liquid container (18).

[0155] 12. Cleaning device according to sentence 11, characterized in that a fan drive (82) of the fan impeller (80) is arranged or formed between the two impellers (70), wherein in particular the impeller axis (72) intersects the fan drive (82).

[0156] 13. Cleaning device according to one of sentences 9 to 12, characterized in that a perpendicular projection of the impellers (70) onto the base plane (24) defines an impeller projection surface (86) and that a perpendicular projection of the center of gravity (58) of the cleaning device body (14) onto the base plane (24) lies within the impeller projection surface (86).

[0157] 14. Cleaning device according to one of sentences 9 to 13, characterized in that the cleaning device (10) can be pivoted from a stationary position in which the support plane (24) is aligned perpendicular to the direction of gravity (32) about the impeller axis (72) into a pulling position and that the center of gravity (58) of the cleaning device body is positioned above or substantially above the impeller axis (72) in the pulling position.

[0158] 15. Cleaning device according to one of sentences 7 to 15, characterized in that the transport device (20) comprises two wheels (22) in the form of swivel casters (64), which extend at least partially over the underside of the device A 501 244 z

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[0160] - 25 -

[0161] (26) protrude so that the casters (64) are parallel to the ground plane

[0162] (24) define the steering wheel axes (66) and that the steering wheels (64) are rotatable about steering axes (68) parallel or substantially parallel to the vertical axis (30).

[0163] 16. Cleaning device according to one of sentences 2 to 15, characterized in that the at least one liquid container (18) forms at least a part of the top of the device (28).

[0164] 17. Cleaning device according to one of sentences 3 to 16, characterized in that the at least one liquid container (18) forms at least a part of the front of the device (48).

[0165] 18. Cleaning device according to one of the preceding sentences, characterized in that the at least one liquid container (18) is designed in the form of a dirty water container (88).

[0166] 19. Cleaning device according to sentence 18, characterized in that a dirty water inlet (94) and an air outlet (96) are arranged or formed on a dirty water container bottom (92) of the dirty water container (88).

[0167] 20. Cleaning device according to one of the preceding sentences, characterized in that the cleaning device (10) comprises two liquid containers (18) and that one liquid container (18) is designed in the form of a fresh water container (90).

[0168] 21. Cleaning device according to sentence 20, characterized in that the fresh water container (90) forms part of the front of the device (48).

[0169] 22. Cleaning device according to sentence 20 or 21, characterized in that the wastewater container (88) has at least one recess (98), ins- A 501 244 z

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[0171] - 26 - has two special recesses (98) for the positive or substantially positive engagement of a corresponding projection (100) of the fresh water reservoir (90).

[0172] 23. Cleaning device according to one of sentences 20 to 22, characterized in that the fresh water tank (90) has a filling opening (102) and that the filling opening (102) points towards the dirty water tank (88).

[0173] 24. Cleaning device according to sentence 23, characterized in that the filling opening (102) is arranged or formed between the projections (100) of the fresh water container (90).

[0174] 25. Cleaning device according to one of sentences 20 to 24, characterized in that the two liquid containers (18) are designed to be detachably connectable to one another and that the two liquid containers (18) are completely separated from one another in a separation position and coupled together in a working position.

[0175] 26. Cleaning device according to sentence 25, characterized in that the dirty water container (88) overlaps the fresh water container (90) at least partially, in particular completely, in the working position.

[0176] 27. Cleaning device according to one of sentences 20 to 26, characterized in that the cleaning device (10) comprises a liquid container coupling device (106) for coupling the two liquid containers (18) with first and second coupling elements (108, 110, 112) arranged or formed on the two liquid containers (18), which are disengaged in the disconnected position and are engaged by force and / or form in the working position. A 501 244 z

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[0178] - 27 -

[0179] 28. Cleaning device according to one of sentences 20 to 27, characterized in that a fresh water outlet (122) is arranged or formed on a fresh water container bottom (120) of the fresh water container (90).

[0180] 29. Cleaning device according to one of the preceding sentences, characterized in that the at least one liquid container (18) comprises a container carrying handle (128) which is pivotable about a pivot axis (132) running parallel to the support plane (24).

[0181] 30. Cleaning device according to sentence 29, characterized in that the container carrying handle (128) is arranged or formed on the dirty water container (88).

[0182] 31. Cleaning device according to sentence 29 or 30, characterized in that the container carrying handle (128) comprises at least one handle locking element (134) which engages with the cleaning device body (14) in a locking position in a force-locking and / or form-locking manner.

[0183] 32. Cleaning device according to one of sentences 29 to 31, characterized in that the container carrying handle (128) comprises a handle section (130) extending parallel to the support plane (24), which in the locked position covers the at least one liquid container (18) on the front of the device (48).

[0184] 33. Cleaning device according to one of the preceding sentences, characterized in that the at least one liquid container (18) comprises a separating device (140) for separating liquid and gaseous components of the dirty water sucked up by the cleaning device (10). A 501 244 z

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[0186] - 28 -

[0187] 34. Cleaning device according to sentence 33, characterized in that the separating device (140) is arranged or designed in the wastewater container (88).

[0188] 35. Cleaning device according to sentence 33 or 34, characterized in that the separation device (140) comprises at least one, in particular two, separation stages.

[0189] 36. Cleaning device according to one of sentences 2 to 35, characterized in that the at least one liquid container (18) comprises a container lid (144) and that the container lid (144) forms a part of the top of the device (28).

[0190] 37. Cleaning device according to sentence 36, characterized in that the separating device (140) is at least partially arranged or formed in the container lid (144).

[0191] 38. Cleaning device according to one of sentences 3 to 37, characterized in that the cleaning device (10) comprises a cleaning device hose (158) and that a hose connection (160) is arranged on the front of the device (48) or in the area of ​​the front of the device (48) for permanent or detachable connection with the cleaning device hose (158).

[0192] 39. Cleaning device according to sentence 38, characterized in that the hose connection (160) is recessed into the cleaning device body (14) opposite the front of the device (48).

[0193] 40. Cleaning device according to sentence 38 or 39, characterized in that the hose connection (160) is guided or positioned below the at least one liquid container (18) in the cleaning device body (14). A 501 244 z

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[0195] - 29 -

[0196] 41. Cleaning device according to one of sentences 38 to 40, characterized in that a distance (164) of the hose connection (160) from the support level (24) is greater than a stair pitch (166) defined in DIN 18065, in particular greater than at least 14 cm, further in particular greater than at least 20 cm.

[0197] 42. Cleaning device according to one of sentences 38 to 41, characterized in that a distance (164) of the hose connection (160) from the support level (24) is at least about one third of the device height (34).

[0198] 43. Cleaning device according to one of sentences 38 to 42, characterized in that a recess (16) for at least partially receiving the cleaning device hose (158) and / or the hose connection (160) is formed on an underside of the fresh water container (90).

[0199] 44. Cleaning device according to one of sentences 2 to 43, characterized in that the cleaning device body (14) comprises a liquid container receptacle (118) for receiving the at least one liquid container (18) in an operating position of the cleaning device (10) and that the liquid container receptacle (118) is open in the direction towards the top of the device (28).

[0200] 45. Cleaning device according to sentence 44, characterized in that the liquid container receptacle (118) is open in the direction towards the front of the device (48).

[0201] 46. ​​Cleaning device according to sentence 44 or 45, characterized in that the liquid container receptacle (118) is open towards the sides (44, 46) of the device. A 501 244 z

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[0203] - 30 -

[0204] 47. Cleaning device according to sentence 46, characterized in that the dirty water inlet (94) is fluidly connected to the hose connection (160) and that the air outlet (96) is fluidly connected to a suction-side suction device inlet (168) of the suction device (16).

[0205] 48. Cleaning device according to one of the preceding sentences, characterized in that a pressure-side suction device outlet (170) of the suction device (16) is fluidly connected to an exhaust air outlet (172) of the cleaning device (10).

[0206] 49. Cleaning device according to sentence 48, characterized in that a filter device (174) is arranged or formed between the suction device outlet (170) and the exhaust air outlet (172).

[0207] 50. Cleaning device according to sentence 49, characterized in that the filter device (174) comprises at least one filter element, in particular in the form of an activated carbon filter.

[0208] 51. Cleaning device according to one of sentences 48 to 50, characterized in that the exhaust air outlet (172) is arranged or formed on the underside (26) of the device.

[0209] 52. Cleaning device according to one of the preceding sentences, characterized in that the cleaning device body (14) comprises a suction device chamber (176), that the suction device (16) is received in the suction device chamber (176) and that the at least one liquid container (18) is arranged above the suction device chamber (176).

[0210] 53. Cleaning device according to one of the preceding sentences, characterized in that the cleaning device body (14) has a technical chamber A 501 244 z

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[0212] - 31 -

[0213] (178) comprises, in particular, a control and / or regulating device (180) of the cleaning device (10), wherein, in particular, the technical chamber (178) is arranged or designed adjacent to the rear of the device (50).

[0214] 54. Cleaning device according to sentence 53, characterized in that the technical chamber (178) is arranged or designed above the suction device chamber (176).

[0215] 55. Cleaning device according to sentence 53 or 54, characterized in that the technical chamber (178) is adjacent to the at least one liquid container (18) in the operating position.

[0216] 56. Cleaning device according to one of sentences 53 to 55, characterized in that a cleaning agent container (182) and / or a cleaning agent dosing device (184) are included in the technical chamber (178).

[0217] 57. Cleaning device according to sentence 56, characterized in that the cleaning agent container (182) is removable from the technical chamber (178).

[0218] 58. Cleaning device according to one of sentences 53 to 57, characterized in that the technical chamber (178) forms a part of the top of the device (28).

[0219] 59. Cleaning device according to one of sentences 53 to 58, characterized in that a fresh water pump (126) and / or a cleaning agent pump (186) are included in the technical chamber (178).

[0220] 60. Cleaning device according to one of the preceding sentences, characterized in that a hose fastening device (188) is arranged or formed on the cleaning device body (14) for fastening A 501 244 z

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[0222] - 32 - of a cleaning device hose (158) during transport of the cleaning device (10).

[0223] 61. Cleaning device according to one of the preceding sentences, characterized in that an accessory receptacle (196) is arranged or formed on the cleaning device body (14).

[0224] 62. Cleaning device according to one of the preceding sentences, characterized in that a connection cable holding device (202) is arranged or formed on the cleaning device body (14).

[0225] 63. Cleaning device according to sentence 62, characterized in that the connecting cable holding device (202) comprises two spaced-apart retaining projections (204) and that a securing projection (208) is arranged or formed on at least one of the two retaining projections (204) and is rotatable about a longitudinal axis (206) of the retaining projection (204) and projects transversely, in particular vertically, with respect to the longitudinal axis (206) of the retaining projection.

[0226] 64. Cleaning device according to one of the preceding sentences, characterized in that the at least one liquid container (18) is designed to be detachably connectable to the cleaning device body (14).

[0227] 65. Cleaning device according to one of the preceding sentences, characterized in that the cleaning device (10) comprises a transport device (210) for moving the cleaning device (10) by a user (212).

[0228] 66. Cleaning device according to sentence 65, characterized in that the transport device (210) comprises a back carrying device, which is arranged or formed in particular on the rear of the device (50). A 501 244 z

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[0230] - 33 -

[0231] 67. Cleaning device according to sentence 65 or 66, characterized in that the transport device (210) comprises a transport handle (216) with a transport handle section (218) extending parallel to the support plane (24).

[0232] 68. Cleaning device according to sentence 67, characterized in that a carrying pad (220) pointing towards the cleaning device body (14) is arranged or formed on the transport handle section (218).

[0233] 69. Cleaning device according to sentence 67 or 68, characterized in that the transport handle (216) is arranged or designed to be pivotable or extendable, in particular telescopic, on the cleaning device body (14).

[0234] 70. Cleaning device according to one of sentences 67 to 69, characterized in that the transport handle (216) in a storage position of the cleaning device (10) is pushed forward as far as possible in the direction of the cleaning device body (14) or pivoted towards it.

[0235] 71. Cleaning device according to sentence 70, characterized in that the transport handle (216) defines an extension direction (222), that the extension direction (222) includes an extension angle (224) with the vertical axis and that the extension angle (224) has a value in a range of 0° to about 25°, in particular in a range of 0° to about 15°.

[0236] 72. Cleaning device according to sentence 70 or 71, characterized in that the transport handle (216) is arranged or designed to be extendable from the top of the device (28) near the rear of the device (50) from the cleaning device body (14). A 501 244 z

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[0238] - 34 -

[0239] 73. Cleaning device according to one of sentences 70 to 72, characterized in that the transport handle section (218) projects beyond a device rear plane (226) defined by the device rear (50) in an extended, in particular a maximally extended, transport position of the transport handle (216).

[0240] 74. Cleaning device according to one of sentences 67 to 73, characterized in that a device handle (194) is arranged or formed on the cleaning device body (14) with a device handle section (236) extending parallel to the support plane (24) and that the transport handle section (218) rests against or abuts the device handle section (236) in the storage position.

[0241] 75. Cleaning device according to one of the preceding sentences, characterized in that the cleaning device (10) comprises a stair support device (238) for supporting the cleaning device placed on a stair step (240) on a lower stair step (242).

[0242] 76. Cleaning device according to sentence 75, characterized in that the stair support device (238) comprises an extendable support element (244), that the support element (244) has at least one support surface (246) extending parallel to the support plane (24), that the at least one support surface (246) is retracted relative to the support plane (24) in a transport position of the cleaning device (10) and projects beyond the support plane (24) in a support position.

[0243] 77. Cleaning device according to one of the preceding sentences, characterized in that the cleaning device (10) comprises a main switch (250) and that the main switch (250) is arranged or formed on a top surface (28) of the device, in particular in the area of ​​a top surface (252) of the technical chamber (178). A 501 244 z

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[0245] - 35 -

[0246] 78. Cleaning device according to one of the preceding sentences, characterized in that the cleaning device (10) has a mains connection and can be connected to a mains supply via a connecting cable (198).

[0247] 79. Cleaning device according to one of the preceding sentences, characterized in that the cleaning device (10) comprises an electrical energy storage device (254) for operating the cleaning device (10) independently of the mains.

[0248] 80. Cleaning device according to one of the preceding sentences, characterized in that the cleaning device (10) is designed in the form of a spray extraction device (12).

[0249] 81. Cleaning device according to one of sentences 1 to 79, characterized in that the cleaning device (10) is designed in the form of a suction device (258).

[0250] The following description of a preferred embodiment of the invention, in conjunction with the drawing, serves for further explanation. The drawing shows:

[0251] Figure 1: a perspective view of an embodiment of a cleaning device from the front in a storage position;

[0252] Figure 2: a perspective view of the arrangement from Figure 1 from behind;

[0253] Figure 3: a view of the arrangement from Figure 2 in the direction of arrow A;

[0254] Figure 4: a perspective view of the arrangement from Figure 1 with the liquid containers removed; A 501 244 z

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[0256] - 36 -

[0257] Figure 5: a sectional view of the cleaning device in a plane perpendicular to the impeller axis;

[0258] Figure 6: a partially cut-away side view of the cleaning device from Figure 2 in the direction of arrow A;

[0259] Figure 7: a partially cutaway view of the cleaning device without the liquid container;

[0260] Figure 8: a perspective exploded view of the two liquid containers;

[0261] Figure 9: a sectional view of the two liquid containers in the working position along line 9-9 in Figure 8;

[0262] Figure 10: an enlarged perspective partial view of the cleaning device in the area of ​​a hose attachment device;

[0263] Figure 11: an enlarged partial view of the cleaning device in the area of ​​a connection cable holding device;

[0264] Figure 12: a view similar to Figure 11 of the connecting cable holding device with pivoted safety projection;

[0265] Figure 13: a schematic representation of the cleaning device in the transport position with the transport handle extended when carried by a user;

[0266] Figure 14: a partially cutaway view of the transport device in the area of ​​the transport handle in a plane parallel to the rear of the device; A 501 244 z

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[0268] - 37 -

[0269] Figure 15: a schematic representation of the cleaning device being pulled by a user in the manner of a trolley;

[0270] Figure 16: a schematic perspective view of a cleaning device placed on a staircase with the stair support device activated;

[0271] Figure 17: a partial sectional view of the cleaning device from Figure 16 in a plane parallel to the back of the device;

[0272] Figure 18: another perspective view of the arrangement from Figure 16;

[0273] Figure 19: a schematic representation of an operating mode of the cleaning device on a display device on a handpiece of the cleaning device;

[0274] Figure 20: a view analogous to Figure 19 when depicting a different operating motor;

[0275] Figure 21: a view analogous to Figure 19 when illustrating another operating mode;

[0276] Figure 22: a view analogous to Figure 19 when illustrating another operating mode;

[0277] Figure 23: a partially enlarged view of the cleaning device with fill level indicators of the two liquid containers;

[0278] Figure 24: a partial view of one side of the cleaning device, with the two level indicators showing the first fill positions of the liquid containers; A 501 244 z

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[0280] - 38 -

[0281] Figure 25: a view analogous to Figure 24, where the two level indicators show different fill positions of the liquid containers;

[0282] Figure 26: a partial view of the cleaning device with main switch and cleaning agent tank level indicator;

[0283] Figure 27: a view analogous to Figure 26 with a half-full cleaning agent container;

[0284] Figure 28: a view analogous to Figure 26 with an empty cleaning agent container;

[0285] Figure 29: a schematic perspective view of the cleaning device during the cleaning of an upholstery;

[0286] Figure 30: an enlarged perspective view of a handpiece of the cleaning device with flexible suction nozzle;

[0287] Figure 31: a perspective view of the arrangement from Figure 30 from below;

[0288] Figure 32: an exploded view of the arrangement from Figure 30;

[0289] Figure 33: a longitudinal sectional view of the arrangement from Figure 30;

[0290] Figure 34: a sectional view along line 34-34 in Figure 33;

[0291] Figure 35: a sectional view along line 35-35 in Figure 33;

[0292] Figure 36: a partially open exploded view of the suction nozzle in the area of ​​the suction inlet;

[0293] Figure 37: a cross-sectional view of the arrangement from Figure 36 in a coupled position; A 501 244 z

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[0295] - 39 -

[0296] Figure 38: a partial view of the arrangement from Figure 31 with the nozzle attachment removed;

[0297] Figure 39: a perspective view of the nozzle attachment looking towards a nozzle attachment coupling section;

[0298] Figure 40: a perspective view of the nozzle attachment looking towards the deformable suction system element;

[0299] Figure 41: a schematic flowchart to illustrate an assistance function of the cleaning device;

[0300] Figure 42: a schematic representation of an embodiment of a cleaning device with an electrical energy storage device;

[0301] Figure 43: a schematic representation of an embodiment of a cleaning device with a control device;

[0302] Figure 44: another schematic representation of an embodiment of a cleaning device; and

[0303] Figure 45: another schematic representation of an embodiment of a cleaning device in the form of a suction device.

[0304] Figures 1 to 18 schematically illustrate an embodiment of a cleaning device 10. It is designed in the form of a spray extraction device 12.

[0305] The cleaning device 10 comprises a cleaning device body 14. A 501 244 z

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[0307] - 40 -

[0308] The cleaning device body 14 is equipped with a suction device 16, at least one liquid container 18 for receiving a dirt liquor sucked up with the suction device 16 and a transport device 20 with at least one wheel 22.

[0309] The drive mechanism 20 defines a support level 24. This protrudes beyond a device underside 26 of the cleaning device body 14.

[0310] In the illustrated embodiment of the cleaning device 10, the suction device 16 is spatially positioned between the support surface 24 and the at least one liquid container 18. This arrangement is particularly evident in Figures 5 and 6.

[0311] The cleaning device body 14 further comprises a top surface 28, which runs parallel or substantially parallel to the bottom surface 26 or to the base 24. A vertical axis defined by the cleaning device body 14 runs transversely, i.e., perpendicularly, to the base 24. This axis, in turn, runs parallel to the direction of gravity 32, which is symbolized by an arrow in Figure 6.

[0312] A device height 34 parallel to the vertical axis 30 corresponds to a distance 36 from the top of the device 28 to the base plane 24. A perpendicular projection of the device housing onto the base plane 24 defines a base area 38 of the cleaning device 10. A device width 40 and a device length 42 define the base area 38. The base area 38 extends perpendicular to the device height 34. The device height 34 is greater than the device length 42. The device height 34 is also greater than the device width 40. This holds true in any section plane perpendicular to the vertical axis 30.

[0313] The device width 40 is defined as the distance between two opposing device sides 44 and 46. The device length 42 is defined as the distance between a device front 48 and a device rear 50 facing away from it. A 501 244 z

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[0315] - 41 -

[0316] A front upper edge 52 of the cleaning device body 14 is formed between the front 48 and the top 28 of the device. A rear lower edge 74 is formed between the rear 50 and the bottom 26 of the device. A cutting plane 56 of the cleaning device 10, which includes the front upper edge 52 and the rear lower edge 54, intersects the drive mechanism 20, the suction device 16, and the at least one liquid container 18.

[0317] The cleaning device body 14 is cuboid or essentially cuboid in shape. The front of the device 48 is aligned parallel or essentially parallel to the rear of the device 50. The two sides of the device 44 and 46 are aligned parallel or essentially parallel to each other.

[0318] The cleaning device body 14 has a center of gravity 58, the position of which is shown schematically in Figure 3. A distance 60 of the center of gravity 58 from the rear of the device 50 is less than a distance 62 of the center of gravity 58 from the front of the device 48.

[0319] In the embodiment shown in the figures, the driving device 20 comprises a total of four wheels 22, thus at least two wheels 22.

[0320] In the embodiment shown in the figures, two of the four wheels 22 are designed to be steerable, namely in the form of caster wheels 64. These protrude at least partially beyond the underside 26 of the device, as can be clearly seen in Figure 3.

[0321] The casters 64 define caster axes 66 running parallel to the support plane 24. Furthermore, the casters 64 are rotatable about caster axes 68 parallel or substantially parallel to the vertical axis 30. This design makes it possible to rotate the stationary cleaning device 10 on the spot without having to lift it. A 501 244 z

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[0323] - 42 -

[0324] Two of the wheels 22 are designed in the form of running wheels 70. These define a common running wheel axis 72, which runs parallel to the support plane 24 and parallel to the device width 40.

[0325] The swivel casters 64 have a swivel diameter 74, the running wheels 70 a running wheel diameter 76. The running wheel diameter 76 is significantly larger than the swivel caster diameter 74. In the embodiment shown in the figures, the ratio of the two diameters is approximately 3.4:1.

[0326] The two wheels 70 protrude partially both from the underside of the device 26 and from the back of the device 50.

[0327] The suction device 16 includes a fan 78 for generating a negative pressure. The fan 78 includes an impeller 80 for conveying air. A fan drive 82, shown schematically in Figure 7, in the form of an electric motor, serves to drive the impeller 80. The fan drive 82 is arranged or formed between the two impellers 70. The impeller axis 72 intersects the fan drive 82.

[0328] The fan impeller 80 is arranged or formed between the impeller axis 72 and the at least one fluid reservoir 18. The fan impeller axis 84 is inclined relative to the vertical axis 30, but slightly less than the section plane 56 with respect to the vertical axis 30.

[0329] A vertical projection of the wheels 70 onto the support plane 24 limits a wheel projection surface 86.

[0330] A perpendicular projection of the center of gravity 58 onto the support plane 24 lies within the wheel projection surface 86. A 501 244 z

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[0332] - 43 -

[0333] The cleaning device 10 can be pivoted from a stationary position, as schematically shown in Figure 6, in which the base 24 is oriented perpendicular to the direction of gravity 32, about the impeller axis 72 into a pulling position, schematically shown in Figure 15. In the pulling position, the center of gravity 58 is positioned above or substantially above the impeller axis 72. However, the exact position of the center of gravity 58 in the pulling position depends on how the cleaning device 10 is pulled and the height of the user 212. This will be explained in more detail later.

[0334] In the embodiment shown in the figures, the at least one liquid container 18 forms at least a part of the top of the device 28. This can be seen particularly well in Figure 6.

[0335] The cleaning device 10, schematically depicted in the figures, comprises two liquid containers 18. One of the two liquid containers 18 is designed in the form of a dirty water container 88, the other in the form of a fresh water container 90. The fresh water container 90 forms at least part of the device's front 48.

[0336] The compact cleaning device 10 assumes a stationary position during the intended operation of the cleaning device 10.

[0337] The wastewater tank 88 has a wastewater tank base 92, which projects away from the top of the unit 28. A wastewater inlet 94 and an air outlet 96 are arranged or formed on the wastewater tank base 92. The wastewater tank 88 and the fresh water tank 90 can be coupled together. For this purpose, two recesses 98 are provided for the positive or substantially positive engagement of corresponding projections 100 of the fresh water tank 90.

[0338] A filling opening 102 is provided on the fresh water tank 90, specifically in an upper area of ​​the A 501 244 z as shown schematically in Figure 5.

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[0340] - 44 -

[0341] The filling opening 102 of the cleaning device 10 points towards the wastewater tank 88 in a ready-to-use position. A closing element 104 is provided for closing the filling opening 102.

[0342] The filling opening 102 is located in an area between the projections 100 of the fresh water tank 90. ​​This design allows the fresh water tank to be filled while lying down, i.e., in a position rotated 90° relative to the orientation of the fresh water tank 88 shown in Figure 5, so that the filling opening 102 points against the direction of gravity 32 during filling. The fresh water tank 90 can thus be filled with fresh water, which forms a cleaning fluid, from a tap until the water level reaches the filling opening 102.If the filled fresh water tank 90 is pivoted back by 90° to its upright position as schematically shown in Figure 5, the incoming fresh water can flow, in particular, into the two indentations of the fresh water tank 90 formed by the projections 100, so that the fill level of the fresh water tank 90 is lower in the direction of gravity 32 than the filling opening 102. Fresh water cannot escape from the fresh water tank 90 even if a user forgets to close the filling opening 102 with the closing element 104.

[0343] The two liquid containers 18 are designed to be detachably connected. In a separation position shown schematically in Figure 8, they are completely separated from each other. In an operating position, as shown schematically in Figure 4, the wastewater container 88 and the fresh water container 90 are coupled together. In the operating position, the wastewater container 88 overlaps the fresh water container 90 at least partially, in fact completely, as can be clearly seen in Figures 3, 4, 5, and 6.

[0344] To couple the two liquid containers 18, the cleaning device 10 includes a liquid container coupling device 106. This includes the A 501 244 z

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[0346] - 45 - coupling elements 108, 110 and 112 arranged or formed between the two liquid containers 18, which are disengaged in the separation position and are engaged by force and / or form locking in the working position.

[0347] One of the coupling elements, namely the coupling element 112, is formed on a pivotable locking lever 114. It points, contrary to the direction of gravity 32, towards a section of the wastewater tank 88 that projects above the fresh water tank 90. ​​In the coupled position, the coupling element 112 engages in a groove-shaped coupling element 110.

[0348] On the underside of the fresh water tank 90, projections are formed which are not shown in the figures and which can be inserted into coupling elements 108 formed on both sides of the two recesses 90 on the waste water tank 88, forming receptacles.

[0349] To decouple the fresh water tank 90 from the dirty water tank 88, the locking lever 114 must be grasped on a handle section 116 and moved against the direction of gravity 32. The coupling element 112 then releases the coupling element 110, allowing the fresh water tank 90 to pivot forward out of the cleaning unit body 14 about a pivot axis defined by the coupling elements 108 and be removed from the dirty water tank 88. Separating the fresh water tank 90 from the dirty water tank 88, and vice versa, can be easily done in the stationary position without having to remove the dirty water tank 88 from the cleaning unit body 14.

[0350] The cleaning device body 14 has a liquid container receptacle 118 for receiving the liquid containers 18 in an operating position of the cleaning device 10. The liquid container receptacle 118 is oriented in the direction A 501 244 z

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[0352] - 46 - open towards the top of the device 28. It is also open towards the front of the device 48 and towards the sides 44 and 46.

[0353] A fresh water outlet 122 is arranged or formed on the bottom 120 of the fresh water tank 90. ​​The fresh water outlet 122 is closed by a valve 124. The valve 124 is designed such that, in the open position when the fresh water tank 90 is removed from the liquid container receptacle 118, it automatically closes the fresh water outlet 122. When the fresh water tank 90 is inserted into the liquid container receptacle 118, the valve 124 opens automatically, allowing fresh water to be pumped out of the fresh water tank 90 by a fresh water pump 126.

[0354] To carry the wastewater tank 88 or the unit consisting of the wastewater tank 88 and the fresh water tank 90 in the working position, as exemplified in Figure 4, a pivotable container carrying handle 128 is arranged or formed on the wastewater tank 88. Part of the container carrying handle 128, namely a handle section 130 thereof, runs parallel to the support plane 24. The container carrying handle 128 is pivotable about a pivot axis 132 running parallel to the support plane 24.

[0355] The container carrying handle 128 comprises two hook-shaped handle locking elements 134 which, in a locking position as shown schematically in Figures 1 to 3, engage in corresponding recesses 136 on the cleaning device body 14 in a force-fit and / or form-fit manner. In the locking position, the container carrying handle 128 extends over the fresh water container 90 at the front of the device 48. In particular, the handle section 130 extends below the top of the device 28 in front of the front of the device 48.

[0356] As shown schematically in dashed lines in Figure 3, the container carrying handle 128 must be moved from the locked position to a removal position. A 501 244 z

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[0358] - 47 - In the position in which the liquid containers 18 can be removed from the liquid container receptacle 118, the handle section 130 is pivoted about the pivot axis 132 such that two parallel legs 138 of the container carrying handle 128, extending from the pivot axis 132 to the handle section 130, are aligned parallel to the direction of gravity 132. In this pivoted position, the handle locking elements 134 release the recesses 136 on the cleaning device body 14. The unit consisting of the two liquid containers 18 can now be removed from the liquid container receptacle 118 upwards and forwards away from the cleaning device body 14, as shown schematically in Figure 4.

[0359] A separator 140 for separating liquid and gaseous components of the dirty water liquor sucked up by the cleaning device 10 is arranged or formed on one of the two liquid containers 18, namely the wastewater container 88. The dirty water liquor enters from below through the dirty water inlet 94 via a channel 142 extending parallel to the direction of gravity 32 into a deflection area 150 formed on a container lid. This deflection area diverts the dirty water liquor onto a slightly inclined drain surface 146 on the wastewater container 88 relative to a plane perpendicular to the vertical axis 30. From there, a liquid component of the dirty water liquor can then flow off and be collected in a receiving chamber 148 of the wastewater container 88.

[0360] The wastewater tank 88 is perforated by a second channel 152, which defines a channel inlet 154 pointing towards the tank lid 144. The channel 152 extends from the channel inlet 154 to the air outlet 96 at the bottom of the wastewater tank 92.

[0361] The described separation device 140 comprises a single separation stage. Optionally, a second separation stage can be provided in other embodiments. A 501 244 z

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[0363] - 48 -

[0364] The container lid 144 forms part of the upper surface of the device 28. As explained, the deflection area 150 of the separation device 140, comprising a deflection bend 156, is arranged or formed on the container lid 144.

[0365] The cleaning device 10 comprises a cleaning device hose 158. A free end of the cleaning device hose 158 is connected to a hose connection 160 of the cleaning device 10, either permanently or temporarily for selective disconnection. The hose connection 160 is located on or in the area of ​​the front of the device 48. In the embodiment shown in the figures, the hose connection 160 is recessed slightly into the cleaning device body 14 relative to the front of the device 48.

[0366] The hose connection 160 is positioned below the fresh water tank 90, specifically in a recess 162 of the tank. The cleaning device hose 158 is led out of the front of the device 48 in the area of ​​the recess 162.

[0367] The distance 164 between the hose connection 160 and the support surface 24 is greater than the stair pitch 166 defined in DIN 18065, which corresponds to the height of a stair step. In particular, the distance 164 is greater than at least 14 cm and, in the embodiment shown in the figures, is also greater than at least 20 cm.

[0368] The distance 164 is approximately one third of the device height 34.

[0369] Furthermore, in the cleaning device 10, the dirty water inlet 94 is fluidly connected to the hose connection 160.

[0370] The air outlet 96 is fluidly connected to a suction-side suction inlet 168 of the suction device 16. This design allows a flow of dirty water from the cleaning device hose 158 through A 501 244 z

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[0372] - 49 - to connect the hose connection 160 to the channel 142 and through it into the wastewater tank 88, and to create an airflow from the wastewater tank 88 through the channel 152 and through the air outlet 96 into the fan 78.

[0373] A pressure-side suction outlet 170 of the suction device 16 is fluidly connected to an exhaust outlet 172 of the cleaning device 10.

[0374] A filter device 174, shown schematically as a dashed line in Figure 5, is arranged or formed between the suction outlet 170 and the exhaust outlet 172. The filter device 174 comprises at least one filter element. This can be in the form of an odor filter, specifically an activated carbon filter.

[0375] The exhaust air outlet 172 is located or formed on the underside 26 of the device.

[0376] The cleaning device body 14 comprises a suction chamber 176 in which the suction device 16 is housed. The two liquid containers 18 are arranged above the suction chamber 26 of the cleaning device 10 in the operating position opposite to the direction of gravity 32.

[0377] The cleaning device body 14 also includes a technical chamber 178. This chamber serves to house a control and / or regulating device 180 of the cleaning device 10. The technical chamber 178 is arranged adjacent to the rear of the device 50. Furthermore, the technical chamber 178 adjoins the liquid container receptacle 118. The technical chamber 178 forms part of the upper surface 28 of the device.

[0378] The technical chamber 178 is arranged or designed above the suction device chamber 176, contrary to the direction of gravity. Therefore, A 501 244 z

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[0380] - 50 - that the technical chamber 178 is adjacent to the liquid container receptacle 118, in the operating position it is also adjacent to the wastewater tank 88.

[0381] The technical chamber 178 also contains a cleaning agent container 182, which serves to hold a cleaning agent, and a cleaning agent dosing device 184. The cleaning agent dosing device 184 includes a cleaning agent pump 186 for pumping the cleaning agent out of the cleaning agent container 182. The cleaning agent container 182 can be removed from the technical chamber 78 for filling.

[0382] The fresh water pump 126 is also located in the technical chamber 178.

[0383] For ease of handling the cleaning device 10, a hose fastening device 188 is arranged or formed on the cleaning device body 14. It comprises two rubber loops 190, which are attached to the top of the device 28. The free ends of the rubber loops 190 can be engaged with hooks 192, which are arranged on a device handle 194 that projects from the top of the device 28 in the form of a U-shaped bracket. As shown in Figures 1 and 2, the rubber loops 190 enclose the cleaning device hose 158 to securely fasten it during transport of the cleaning device 10.

[0384] For the storage of accessories and small parts, an accessory receptacle 196 is arranged or formed on the cleaning device body 14, in a transition area between the rear of the device 50 and the side of the device 46.

[0385] The cleaning device 10, schematically depicted in the figures, is designed as a mains connection device and comprises a cleaning device body A 501 244 z.

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[0387] - 51 -

[0388] 14. Extended connection cable 198 with a plug 200 for plugging into a socket.

[0389] To secure the connecting cable 198 in a defined manner during transport of the cleaning device 10, the cleaning device body includes a connecting cable holding device 202. This is formed in the transition area between the rear of the device 50 and the side of the device 44 and comprises two spaced-apart retaining projections 204. A securing projection 208, projecting transversely, in particular vertically, with respect to a longitudinal axis 206 of the retaining projection, is arranged on at least one of the two retaining projections 204.

[0390] The locking projection 208 is designed to be rotatable about the longitudinal axis 206 of the retaining projection. It can be rotated by 180° so that the locking projection 208 points either in the direction of gravity, as schematically shown in Figure 11, or against the direction of gravity, as schematically shown in Figure 12.

[0391] To remove the connecting cable, which is coiled as shown schematically in Figure 2, from the connecting cable holder 202, the locking protrusions 208 can be rotated so that their free ends point towards each other. This described position of the locking protrusions 208 is thus exactly the opposite of the orientation of the locking protrusions 208 shown in Figure 2. Because the locking protrusions 208 can be rotated, the connecting cable 198 can be removed from the cleaning device body 14 without having to unwind it.

[0392] The cleaning device 10 includes a transport device 210 for moving the cleaning device 10 by a user 212.

[0393] In an embodiment not shown in the figures, the transport device 210 may include a return carrying device. This may be arranged or formed, in particular, on the rear of the device 50. A 501 244 z

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[0395] - 52 -

[0396] User 212 can then carry the cleaning device 10 on his back 214 in the manner of a backpack.

[0397] In the embodiment shown in the figures, the transport device 210 comprises a transport handle 216 with a transport handle section 218 extending parallel to the support plane 24. Optionally, a carrying pad 220, shown schematically as a dashed line in Figure 14 and pointing towards the cleaning device body 14, is arranged or formed on the transport handle section 218.

[0398] In an embodiment not shown in the figures, the transport handle 216 is arranged or designed to pivot on the cleaning device body 14.

[0399] In the embodiment of the cleaning device 10 shown schematically in the figures, the transport handle 216 is extendable, i.e. telescopically arranged or designed.

[0400] In a storage position of the cleaning device 10, the transport handle 216 is pushed forward as far as possible towards the cleaning device body 14 or alternatively pivoted towards it.

[0401] The transport handle 216 defines an extension direction 222. This direction, together with the vertical axis 30, forms an extension angle 224. The extension angle 224 has a value in the range of 0° to approximately 25°. In the embodiment shown in the figures, the extension angle 224 is slightly less than 15°.

[0402] The transport handle 216 is extendable from the top of the device 28 near the rear of the device 50, extending from the cleaning device body 14. In an extended, particularly a fully extended, transport position of the transport handle 216, the transport A 501 244 z

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[0404] - 53 - handle section 218 extends over a rear surface 226 defined by the rear of the device 50. This allows the user 212 to reach through an opening defined by the transport handle 216 and the top of the device 28 with one arm 228 and place the transport handle section 218 on one shoulder 230. This allows the cleaning device 10 to be carried easily and ergonomically close to the user's body 212, for example, to transport the cleaning device 10 up or down stairs.

[0405] On a level surface, the cleaning device 10 can be pulled behind a user. For this purpose, it is pivoted from the stationary position to the pulling position as described. The user 212 can grasp the transport handle section 218 with one hand 232 and pull the cleaning device 10 behind them while walking. In the pulling position, the swivel casters 64 are lifted from the floor 234 over which the cleaning device 10 is being pulled. The cleaning device 10 then rests on the floor 234 only with its two wheels 70.

[0406] The device handle 194 is arranged on the cleaning device body 14, or rather, is formed with a device handle section 236 running parallel to the support plane 24. In the storage position, the transport handle section 218 rests against the device handle section 236 as shown schematically in Figure 16.

[0407] The cleaning device 10 also includes a stair support device 238. This makes it possible to place the cleaning device 10 on a stair step 240 with the transport device 20 and to support it on a lower stair step 242.

[0408] The stair support device 238 comprises an extendable support element 244, which, in the embodiment shown in the figures, has two support surfaces 246. Alternatively, only a single support surface 246 can be provided. A 501 244 z

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[0410] - 54 -

[0411] In the transport position of the cleaning device 10 shown in Figure 2, the support surfaces 246 are retracted relative to the base 24. In the support position shown schematically in Figures 16 to 18, the support surfaces 246 project beyond the base 24.

[0412] In the embodiment shown in the figures, the stair support device 238 is designed separately from the transport device 210.

[0413] In alternative embodiments of cleaning devices 10 not shown, the transport device 210 on the cleaning device body 14 can also be arranged or designed such that the transport handle 216 can be pushed from the transport position, as schematically shown in Figure 15, so far into the cleaning device body 14 that it protrudes from the underside 26 of the device above the support level 24 in order to place and support the cleaning device 10 on a staircase 248 in an analogous manner as schematically shown in Figure 16.

[0414] The cleaning device 10 includes a main switch 250, which is arranged or formed on the top of the device 28. In the embodiment shown schematically in the figures, the main switch 250 is arranged in the area of ​​a top surface 252 of the technical chamber 178.

[0415] Figure 42 schematically shows an embodiment of a cleaning device 10 with an electrical energy storage device 254 in the form of a rechargeable battery 256 to operate the cleaning device 10 independently of the mains.

[0416] Optionally, the cleaning device 10 can have both a mains connection and an electrical energy storage device 254.

[0417] The cleaning device 10, schematically depicted in the figures, is designed in the form of a spray extraction device. A 501 244 z

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[0419] - 55 -

[0420] Figure 45 schematically shows an embodiment of a cleaning device 10 in the form of a suction device 258. The suction device 258 comprises only a single liquid container 18, namely the dirty water container 88. The suction device 258 can only vacuum up a dirty solution. However, it is not possible to apply a cleaning fluid to a surface to be cleaned using the cleaning device 10 in the form of the suction device 258.

[0421] Figure 29 shows, by way of example, the cleaning device 10 in its stationary position while cleaning a cushion 260 of a piece of seating furniture 262. To apply a cleaning fluid and optionally a cleaning agent to the cushion 260, a user guides a handpiece 264 of the cleaning device 10 with their hand 232. The handpiece 264 is connected to a free end 266 of the cleaning device hose 158.

[0422] The construction of the handpiece 264 and in particular of a suction nozzle 268 encompassed by it is explained in more detail below in conjunction with Figures 29 to 40.

[0423] The suction nozzle 268 is arranged or formed at a front end of the handpiece 264. It defines a suction inlet 270, which is fluidly connected to the suction-side suction device inlet 168 via the cleaning device hose 158, in which a suction channel 272 is formed.

[0424] In the embodiment shown in the figures, the handpiece 264 is detachably connected to the cleaning device hose 158. A coupling device 274 is provided for this purpose, which enables the detachable connection of the handpiece 264 to the cleaning device hose 158.

[0425] In embodiments not shown, the handpiece 264 is permanently attached to the cleaning device hose 158 and is not intended to be separated from it. A 501 244 z

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[0427] - 56 -

[0428] For dispensing a cleaning fluid, a fluid outlet 276 is provided on the handpiece 264, specifically on a spray nozzle 278. This nozzle is arranged at a distance from the suction nozzle 268. Between the fluid outlet 276, which serves to dispense cleaning fluid onto a surface to be cleaned, and the suction nozzle 268, a cleaning element 280 in the form of a rotatable brush roller 282 is provided. This roller comprises a roller body 284, from which bristle bundles 286, comprising a plurality of bristles, project radially with respect to a roller axis 288.

[0429] The roller axis 288 of the roller body 284 extends transversely, namely vertically and laterally offset to a grip area axis 290, which is defined by a grip area 292 of the handpiece 264.

[0430] A drive unit 294 in the form of an electric motor is arranged on the handpiece 264 to rotate the brush roller 282. The electric motor can rotate the roller body 284 via a gear unit comprising gears 296, 298 and 300.

[0431] The liquid outlet 276 of the spray nozzle 278 is directed towards the surface to be cleaned, preferably such that the bristle bundles 286, which project from the roller body 284 towards the surface to be cleaned, are not sprayed and a major part of the dispensed liquid directly impacts the surface to be cleaned. Alternatively, particularly with stationary or oscillating brushes, it can also be advantageous if their bristles or bristle bundles are directly wetted with cleaning fluid and optionally also with cleaning agent.

[0432] The suction nozzle 268 comprises a deformable suction element 302. It defines a suction surface 304 for contact with the surface to be cleaned, for example, the upholstery 260. The suction inlet 270 is arranged on or formed within the suction element 302. A 501 244 z

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[0434] - 57 -

[0435] The suction inlet 270 is formed in the form of an opening 306 in the suction system element 302 in the area of ​​the suction system surface 304. The suction inlet 270 also has the form of a slot 308.

[0436] The slot 308 has a slot length 310 and a slot width 312. In the embodiment shown in the figures, the ratio of slot length 310 to slot width 312 is in the range of approximately 20:1 to approximately 80:1. In particular, the ratio is in the range of approximately 30:1 to approximately 50:1. In the embodiment shown in the figures, the ratio is approximately 40:1.

[0437] The slot 308 is divided into several slot sections 318 by several transverse webs extending perpendicular to a longitudinal direction 314 of the slot. The number of transverse webs 316 preferably ranges from 2 to 20. In the embodiment shown in the figures, nine transverse webs are provided, thus defining ten slot sections 318.

[0438] The crossbars 316 taper away from the suction system element 302, in particular in a wedge shape.

[0439] The suction system surface 304 surrounds the suction inlet 270 on all sides.

[0440] The suction inlet 270 defines a suction inlet area. This is calculated as the product of the slot length 310 and the slot width 312.

[0441] The suction surface 304 has a length 320 parallel to the slot length 310 and a width 322 parallel to the slot width 312. In the basic position of the suction element 302, in which it is undeformed, the suction surface 304 is flat. The size of the suction surface 304 is thus the product of its length 320 and width 322. The ratio of the suction surface 304 to the suction inlet area is in the range of approximately 5:1 to approximately 100:1. Preferably, the ratio is in the range of approximately 5:1.

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[0443] - 58 - to 40: 1. In the embodiment shown in the figures, the ratio is approximately 11 : 1.

[0444] The deformable suction system element 302 is elastic or flexible. This allows it to be easily deformed. The suction system surface 304, which is flat in its basic position, can thus be applied to surfaces that are curved in one or more ways.

[0445] The suction nozzle 268 comprises a suction nozzle body 324 and a nozzle attachment 326. The nozzle attachment 326 comprises the suction system element 302.

[0446] In the embodiment shown in the figures, the suction nozzle body 324 is detachably connected to the nozzle attachment 326. In an operating position, as shown schematically in Figure 37, the suction nozzle body 324 and the nozzle attachment 326 are gas-tightly connected to each other. In a separation position, also shown schematically in Figure 37, the suction nozzle body 324 and the nozzle attachment 326 are completely separated from each other.

[0447] On the suction nozzle body 324 and the nozzle attachment 326, cooperating connecting elements 328 and 330 are arranged or formed, which are engaged with each other in the working position in which the suction nozzle body 324 and the nozzle attachment 326 are connected to each other, and which are disengaged in the separation position. The connecting elements 328 and 330 are designed in the form of detent elements, specifically in the form of detent projections 332 and corresponding detent recesses 334, which positively engage the detent projections 332 in the working position.

[0448] In alternative embodiments not shown, the suction system element 302 and the suction nozzle body 324 are materially bonded and gas-tight. The suction system element 302 and, with it, the nozzle attachment 326 are then either injection-molded onto the suction nozzle body 324 or bonded to it. A 501 244 z

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[0450] - 59 -

[0451] In the embodiment shown in the figures, the nozzle attachment 326 comprises a nozzle attachment coupling section 336. The suction nozzle body 324 comprises a suction nozzle body coupling section 338. In a coupling position, which also defines the operating position, the nozzle attachment coupling section 336 and the suction nozzle body coupling section 338 are engaged with each other by force and / or form locking, as shown schematically in Figure 37, and in a separation position, as shown schematically in Figure 36, they are disengaged.

[0452] The locking recesses 338 are formed as circumferential grooves on the nozzle attachment coupling section 336, and the locking projections 332 are formed as circumferential projections on the suction nozzle body coupling section 338. The nozzle attachment coupling section 336 also forms a receptacle 340 for the suction nozzle body coupling section 338. The locking recesses 334 are arranged or formed in the area of ​​the receptacle 340.

[0453] A free inner cross-section 340 of the nozzle attachment 326 in a plane parallel to the suction system element 302 and the suction system surface 304 encompassed by it increases from the suction inlet 270 towards the nozzle attachment coupling section 336.

[0454] To connect the suction nozzle body 324 and the nozzle attachment 326, in particular to facilitate their connection, the suction nozzle body 324 and the suction nozzle body coupling section 338, respectively, are made of a first material. The suction system element 302 and the nozzle attachment coupling section 336 are made of a second material. The modulus of elasticity of the first material is greater than the modulus of elasticity of the second material, in particular ten times greater.

[0455] In the embodiment shown in the figures, the first material is a rigid plastic. For example, this could be polyamide (PH). A 501 244 z

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[0457] - 60 -

[0458] The second material is rubber, a silicone, or a thermoplastic elastomer (TPE). For example, it could be ethylene propylene diene monomer rubber (EPDM), thermoplastic polyurethane (TPU), styrene block copolymer (TPS), thermoplastic vulcanizate (TPV), and / or thermoplastic polyolefin (TPO).

[0459] To better adapt the suction system element to surfaces to be cleaned, especially those with three-dimensional shapes, the nozzle attachment 326 includes an elastically and / or flexibly deformable bellows element 344. This bellows element 344 movably connects the nozzle attachment coupling section 336 and the suction system element 302. The bellows element 344 has a material thickness that is slightly less than that of the suction system element 302. This allows the nozzle attachment 326 to deform between the suction system element 302 and the nozzle attachment coupling section 336 in a direction transverse to, and especially perpendicular to, the suction system surface 304. The bellows element 344 also limits a flow section of a suction flow path 412 extending from the suction system element 302 to the nozzle attachment coupling section 336.

[0460] The bellows element 344 and the suction system element 302 are formed in one piece, namely monolithically.

[0461] Furthermore, the nozzle attachment 326 is entirely monolithic, meaning it is made in one piece.

[0462] The suction nozzle 268 is located at a front end of the handle area 292 and points obliquely forward. The suction surface 304 runs parallel or substantially parallel to the handle area axis 290. The suction nozzle 268 and the handle area 292 are formed in one piece. Starting from the suction nozzle body coupling section 338, a suction channel 346 extends to a rear end of the handpiece 264, where it connects by means of the A 501 244 z

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[0464] - 61 -

[0465] The coupling device 274 is connected or connectable to the cleaning device hose 158.

[0466] A fluid hose 348 is routed through the cleaning device hose 158 and is fluidly connected to the fresh water reservoir 90. This allows cleaning fluid to be pumped from the fresh water reservoir 90 to the handpiece by the fresh water pump 126 and through a fluid channel 350 of the handpiece to the fluid outlet 276. A section of the suction nozzle 268, projecting transversely from the grip area 292, is closed at the front by a sight glass 352. This allows the user to see into the suction channel, specifically into an area directly adjacent to the suction nozzle body coupling section 338.

[0467] On a rear side facing away from the sight glass 352, a housing part 354 is arranged, which, extending from the nozzle attachment coupling section 336, includes a hood-like receptacle 356 for the cleaning element 280. The cleaning element 280 is approximately half-received in the receptacle 356. The free ends of the bristle bundles 286 protrude approximately to a plane defined by the suction surface 304.

[0468] As described, and as can be seen particularly well in Figure 33, the cleaning element 280 is arranged in an area between the liquid outlet 276 and the suction system element 302. The cleaning element 280 also extends parallel to the suction system element 302.

[0469] Particle sensors 358 are arranged or formed on both sides of the section of the suction duct 346 extending behind the sight glass 352. Their function will be explained below.

[0470] Furthermore, an operating device 360 ​​is arranged or formed in the transition area from the handle area 292 to the suction nozzle 268. A 501 244 z

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[0472] - 62 -

[0473] The 360 ​​control unit is designed to activate and deactivate the suction unit 16. It can also be used to activate and deactivate the dispensing of cleaning fluid.

[0474] The operating device 360 ​​is further designed to activate and deactivate the drive device 294 for moving the cleaning element 280.

[0475] The cleaning device 10 comprises a cleaning agent dispensing device 362 in the form of a cleaning agent dosing device 184 for adding cleaning agent to the cleaning fluid before dispensing it onto the surface to be cleaned. The operating device 360 ​​is designed to activate and deactivate the cleaning agent dispensing device 362. The cleaning agent dispensing device 362 includes the cleaning agent pump 186 for pumping cleaning agent from the cleaning agent container 182 to the fluid outlet 276 connected to it.

[0476] The operating device 360 ​​is arranged or designed on the handpiece 264 such that it can be operated with a single hand 232 of a user 212. Thus, the operating device 360 ​​is designed for one-handed operation of functions of the cleaning device 10 that can be activated and / or deactivated with it.

[0477] In exemplary embodiments not shown, the operating device 360 ​​is designed to be detachable from the handpiece 264. Thus, the operating device 360 ​​and the handpiece 264 can be detachably connected. In such a case, a mobile device, for example a smartphone, can comprise or form the operating device 360.

[0478] In the embodiments shown in the figures, the operating device 360 ​​is permanently and indetachably connected to the handpiece 264 as intended. A 501 244 z

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[0480] - 63 -

[0481] The operating device 360 ​​is partly arranged or formed on a handle area top 364 and partly on a handle area back 366.

[0482] The operating device 360 ​​comprises a first operating element 368 for activating and deactivating the suction device 16. It is arranged or formed on the upper surface of the handle area 364.

[0483] A second control element 370 of the control device 360 ​​serves to activate and deactivate the drive device 294, with which the cleaning element 280 can be moved. The second control element 370 is also arranged or formed on the upper surface of the handle area 364, next to the first control element 368.

[0484] The operating device 360 ​​includes a third operating element 372 for activating and deactivating the cleaning agent dispensing device 362. The third operating element 372 is arranged or formed on the handle area 292 on the rear side 366 of the handle area.

[0485] A fourth control element 376 of the control device 360 ​​for activating the liquid dispensing is arranged or formed on the handle area 292 on the rear side 366 of the handle area. The cleaning device 10 includes a cleaning fluid pump 374 in the form of the fresh water pump 126 for pumping cleaning fluid from the fresh water tank 90 to the liquid outlet 276. The fourth control element 376 is designed for activating and deactivating only the cleaning fluid pump 374.

[0486] All four operating elements 368, 370, 372 and 376 of the operating unit 360 are designed as electrical pushbuttons and / or switching elements. These are connected to the control and / or regulating unit 180 via control lines (not shown) in a control-effective manner. A 501 244 z

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[0488] - 64 -

[0489] By actuating the third control element 372, the fourth control element 376 is also actuated simultaneously, so that when the third control element 376 is actuated, not only cleaning agent is dispensed from the liquid outlet 276, but also cleaning fluid.

[0490] The cleaning device 10 also includes a display unit 378 for indicating the operating states of functions that can be activated and deactivated by the operating unit 360. The display unit 378 is arranged on or formed on the handpiece 264.

[0491] In an embodiment not shown, the display device 378 is designed to be detachable from the handpiece 264. Thus, the display device 378 and the handpiece 264 can be detachably connected to each other.

[0492] In the embodiment shown in the figures, the operating device 360 ​​comprises the display device 378.

[0493] In one embodiment where the mobile device forms the operating unit 360, the display of the mobile device forms the display unit 378.

[0494] The display device 378 comprises a first display element 380 for indicating an operating status of the suction device 16. The first display element 380 is spatially arranged in relation to the first control element 368. It is positioned in front of the first control element 368 in the direction of the suction nozzle 268.

[0495] A second display element 382 of the display device 378 serves to indicate an operating status of the drive device 294. The second display element 382 is spatially arranged in relation to the second control element 370. It is positioned next to the first display element 380 and in front of the second control element 370, facing the suction nozzle 268. A 501 244 z

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[0497] - 65 -

[0498] The display device 378 further comprises a third display element 384 for indicating a fill level of the wastewater tank 88 and / or the fresh water tank 90. ​​The third display element 384 can also be used to indicate a fill level of the detergent tank 182.

[0499] The cleaning device 10 also includes an operating status indicator 368, which is spatially assigned to the main switch 250. The operating status indicator 368 is designed as an optical display element and surrounds the main switch 250 in a ring shape. The operating status indicator 368 can indicate an operating status of the cleaning device 10 by means of different colors. This will be explained in more detail below.

[0500] As already explained, the control and / or regulating device 180 of the cleaning device 110 serves to control the suction device 16, the cleaning fluid pump 374, the drive device 294 and the cleaning agent dispensing device 362.

[0501] In the embodiments shown in the figures, the operating unit 360 and the control and / or regulation unit 180 interact via a wired connection. In alternative embodiments, the interaction between the operating unit 360 and the control and / or regulation unit 180 can also be wireless, in particular via radio, for example Bluetooth or Wi-Fi.

[0502] The cleaning device 10 can be used in particular to clean a surface, for example the surface of the cushion 260 as shown schematically in Figure 29.

[0503] To use the cleaning device 10, the main switch 250 must first be activated. This puts the cleaning device 10 into a standby state. This can then be indicated by a corresponding color display on the operating status indicator 386. A 501 244 z

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[0505] - 66 -

[0506] A user 212 can now grasp the handpiece 264 as schematically shown in Figure 29 and then, using the thumb 388 of their hand 232, selectively operate either the first control element 368 or the second control element 370 to activate either the suction device 16 or, alternatively or additionally, the drive device 294. The first indicator element 380 symbolizes a suction nozzle and also includes an arrow symbolizing a suction flow. The second indicator element 382 symbolizes the cleaning element 280. The third indicator element 384 symbolizes a container with a fill level indicator.

[0507] When the user 212 activates the fourth control element 376 with his index finger 392, the cleaning fluid pump 374 is activated and cleaning fluid is dispensed through the fluid outlet 276.

[0508] If cleaning agent is to be added to the cleaning fluid – preferably water – the user can operate the third control element 372 with their middle finger 390. Activating this element activates both the cleaning fluid pump 374 and the cleaning agent dispensing device 362, allowing cleaning fluid with added cleaning agent to be dispensed from the fluid outlet 276.

[0509] Figures 19 to 22 show, by way of example, the use of the operating device 360 ​​and the display device 378.

[0510] Figures 19 to 28 use hatching to symbolize colors. The color "green" is represented by dots. The color "yellow" is represented by hatching with percent signs. The color "red" is represented by a grid pattern. Display elements without texture are deactivated; therefore, they do not light up. A 501 244 z

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[0512] - 67 -

[0513] In Figure 19, the first indicator element 380 and the second indicator element 382 are both illuminated in green. This means that both the suction device 16 and the drive device 294 of the cleaning element 280 are activated.

[0514] Figure 20 schematically shows a green illuminated first indicator element 380. The second indicator element 382 is not illuminated. Thus, only the suction device 16 is activated. The cleaning element 280 is not moving. The third indicator element 384 is illuminated yellow, because at least one container of the cleaning device 10, i.e., the dirty water container 88, the fresh water container 90, and / or the cleaning agent container 182, has reached a state that, while still allowing the cleaning device 10 to continue operating, will require either emptying the dirty water container 88, refilling the fresh water container 90, or refilling the cleaning agent container 182 in the foreseeable future.

[0515] In Figure 21, the suction device 380 is activated as indicated by the first indicator 380. The drive unit 294 is deactivated. The third indicator 384 is illuminated in red. This means that the dirty water tank 88 is full, or that the detergent tank 182 or the fresh water tank 90 is empty. The user 212 can directly read which of the three tanks is affected from corresponding indicators, which will be explained in more detail below and which are arranged or formed on the cleaning device body 14.

[0516] In Figure 22, none of the three indicator elements 380, 382, ​​and 384 are illuminated. Therefore, the suction device 16 and the drive unit 294 are deactivated. The fill levels in the dirty water tank 88, the fresh water tank 90, and the detergent tank 182 are within acceptable limits.

[0517] As schematically shown in Figures 19 to 21, a fourth indicator element 394 is arranged in the area of ​​the part of the operating device 360 ​​that is formed on the handle in the upper part 364. It is U-shaped and A 501 244 z

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[0519] - 68 - open, pointing towards the suction nozzle 268. The fourth indicator element 394 can display the same color states as indicator elements 380, 382 and 384, i.e. green, yellow and red. However, it can also remain off.

[0520] Before the functionality of the fourth display element 394 is explained, the functionality of three first, second and third level indicator elements 396, 398 and 400, assigned to the dirty water tank 88, the fresh water tank 90 and the detergent tank 128, is first explained in conjunction with the figures 23 to 28.

[0521] The first and second level indicator elements 396 and 398 are arranged on a frame surrounding the liquid container receptacle 118, such that the first level indicator element 396 is directly adjacent to the dirty water container 88 and the second level indicator element 398 to the fresh water container 90. The third level indicator element 400 is arranged on the rear of the device 50 immediately next to the detergent dosing device 184, which has a receptacle for the detergent container 182. Reference is made to Figure 2 in this regard.

[0522] The three level indicator elements 396, 398, and 400 are optical indicators and can illuminate green, yellow, or red depending on the fill level in the respective container. A green level indicator element 396 signals that the wastewater tank 88 is empty. If the first level indicator element 396 illuminates yellow, the wastewater tank 88 is half full. If the first level indicator element 396 illuminates red, the wastewater tank 90 is full.

[0523] Similarly, a full fresh water tank 90 can be indicated by a green illuminated second level indicator element 398, a half-full fresh water tank 90 by a yellow illuminated second level indicator element 90, and an empty fresh water tank 90 by a red illuminated second level indicator element 398. A 501 244 z

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[0525] - 69 -

[0526] Similarly, the third level indicator element 400 in Figures 26, 27 and 28 shows a full cleaning agent container 182 in Figure 26, a half-full cleaning agent container 182 in Figure 27 and an empty cleaning agent container 182 in Figure 28.

[0527] In Figure 26, the operating status indicator 386 is shown illuminated in red. The operating status indicator 386 can be used, in particular, to be activated and illuminate in a color, for example red or yellow, when any operating state of a component of the cleaning device 10 is not functioning or is only functioning to a limited extent, or when, for example, the fill level in one of the containers of the cleaning device 10 is in a critical state, for example empty in the case of the fresh water container 90 or full in the case of the dirty water container 88. In particular, the operating status indicator 386 can thus also signal the same information to the user 212 as the third display element 384 on the handpiece 264.

[0528] The cleaning device 10 also includes a control unit 402 for determining and displaying a system value that corresponds to the contact of the suction nozzle 268 with the surface to be cleaned. In other words, the control unit 402 provides feedback to the user 212 as to whether the suction nozzle 268 is in contact with the surface to be cleaned as completely as possible. If the contact is not complete, leakage air can flow between the surface to be cleaned and the suction element 302 to the suction inlet 270, thereby reducing the negative pressure in the suction flow path 412 between the suction inlet 270 and the suction unit 16. The nozzle contact refers to, or indicates, how the suction nozzle 268 with the suction element 302 is in contact with the surface to be cleaned.If the suction system surface 304 lies flat against the surface to be cleaned, there are practically no leakage air currents into the suction inlet 270, so that a maximum negative pressure can be achieved with the suction device 16 in the suction flow guide 412. A 501 244 e.g.

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[0530] - 70 -

[0531] The asset value can be displayed using the fourth display element, 394. This will be explained in more detail below.

[0532] Figure 43 shows a purely schematic representation of the construction of a cleaning device 10 with control device 402. The suction flow path 412 extends through the cleaning device hose 158 from the suction inlet 270 to the suction device 16.

[0533] The control device 402 comprises at least one sensor device 404 for measuring at least one extraction parameter. A data processing device 406 of the cleaning device 10 interacts with the sensor device 404 to determine the system value as a function of the at least one measured extraction parameter. Furthermore, the control device 402 comprises a display device 358 for displaying the determined system value. The display device 358 includes the fourth display element 394 for optically displaying the system value. Alternatively or additionally, acoustic and / or haptic display elements may also be provided to signal the system value to the user 212. The optical display element 394 is designed to display a color signal corresponding to the system value. The fourth display element 394 can either remain off, illuminate green as shown by way of example in Figure 21, or illuminate red as shown by way of example in Figure 22.

[0534] The at least one sensor device 404 of the cleaning device 10 is designed in particular in the form of a vacuum sensor 410 for measuring a vacuum as a suction parameter in the suction flow path 412 between the suction nozzle 268 and the suction-side suction device inlet 168 of the suction device 16.

[0535] In the embodiments shown in the figures, the vacuum sensor 410 is arranged or formed on or in the area of ​​the suction device inlet 168. A 501 244 z

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[0537] - 71 -

[0538] The control device 402 also includes a sensor device 404 in the form of a particle sensor 358, which is designed to measure particles, in particular liquid particles, as suction parameters in the suction flow path 412 between the suction nozzle 268 and the suction-side suction device inlet 168 of the suction device 16.

[0539] In the schematic diagram of the structure of a cleaning device 10 shown in Figure 44, the particle sensor 358 is depicted as an optional element with a dashed line. It is arranged or formed in the handpiece 264, specifically downstream of the suction nozzle 268 in the direction of flow.

[0540] The fourth display element 394 is designed to generate or display a running light signal corresponding to the system value, indicating a recommended direction of movement for the handpiece 264. This running light can be implemented with the fourth display element 394 in such a way that it does not illuminate uniformly in color, but rather in a running light pattern, radiating from free ends 416, which point towards the suction nozzle 268, to a central area 418, which points towards the grip area 292. Such a running light intuitively signals to the user 212 a direction of movement towards their hand 232. The running light prompts the user to move the handpiece 264 towards themselves over the surface to be cleaned.

[0541] In the embodiments shown in the figures, the fourth display element 394 is arranged or formed in the handpiece 264. Alternatively or additionally, it can also be arranged or formed on the cleaning device body 14 of the cleaning device 10.

[0542] The data processing unit 406 is designed to compare the measured extraction parameter with an extraction parameter limit value and to determine a reference value that indicates whether the extraction parameter is lower or higher than the extraction parameter limit value. The determined reference value is then assigned to the system value. Thus, the value specified by A 501 244 z

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[0544] - 72 -

[0545] The system compares the measured system value to determine whether it is above or below the extraction parameter limit. Accordingly, there are two displayable states, which can be indicated to the user by the colors red and green.

[0546] Figure 44 schematically shows the operating device 360 ​​and the display device 378 connected to the control and / or regulating device 180 via a connecting cable 408. The connecting cable 408 can comprise several lines to exchange control and data signals between the handpiece 264 and the control and / or regulating device 180.

[0547] The cleaning device 10, with the control unit 402, enables the user 212 to be assisted during cleaning. A schematic representation of the functionality is shown in Figure 41. The control unit 402 is activated when the suction unit 16 is activated via the first control element 368. The first indicator element 380 then illuminates green. This corresponds to step S1 in Figure 41. After activation of the suction unit 16, the sensor unit 404, in particular the vacuum sensor 410, is activated in step S2. In step S3, the control unit compares the vacuum value measured by the vacuum sensor with a vacuum limit value that is still sufficient for an adequately good suction result. If the measured vacuum is lower than the vacuum limit value, the user 212 receives feedback in step S4 via the fourth indicator element 394. In this case, the fourth indicator element 394 remains red.

[0548] In step S5, the particle sensor 358 determines whether, and in particular how many and how large, particles are present in the area of ​​the suction nozzle 268. If no particles are detected or the measured value falls below a particle limit, the feedback on the fourth display element 394 is maintained. However, if particles are detected in step S5, the feedback to the user 212 via the fourth display element 394 changes in step S6.

[0549] October 17, 2025 z-390 / 415

[0550] - 73 -

[0551] Display element 394. This switches to a running light mode and indicates to the user 212 that the surface to be cleaned is not yet dry enough and requires further vacuuming. The running light intuitively guides the user to move the suction nozzle 268 back over the surface to be cleaned and towards them again.

[0552] If, during step S3, the vacuum sensor detects a vacuum value greater than the vacuum limit, the fourth indicator 394 signals to the user 212 that a nozzle system is required. The fourth indicator then illuminates continuously in green.

[0553] The control unit 402 can optionally be used to adjust the suction power of the suction unit, depending on the comparison result obtained in step S3. If the measured negative pressure is lower than the specified negative pressure limit, the power consumption of the fan drive can optionally be reduced using the control and / or regulation unit 180, thus reducing the suction power of the suction unit 16. Only when the suction nozzle 268 is once again in full contact with the surface to be cleaned, as desired, and the measured negative pressure is again higher than the specified negative pressure limit, is the suction power of the suction unit increased again. In this way, a surface can be cleaned energy-efficiently, particularly with a cleaning device 10 that is operated independently of the mains power supply using a battery 256.

[0554] A 501 244 z

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[0556] - 74 -

[0557] Reference symbol list

[0558] 10 Cleaning device

[0559] 12 Spray extraction machine

[0560] 14 Cleaning device bodies

[0561] 16 Suction unit

[0562] 18 liquid containers

[0563] 20 Driving equipment

[0564] 22 wheel

[0565] 24th level of insurgency

[0566] 26 Device underside

[0567] 28 Device top

[0568] 30 Vertical axis

[0569] 32 Direction of gravity

[0570] 34 Device height

[0571] 36 distance

[0572] 38 Footprint

[0573] 40 device width

[0574] 42 device length

[0575] 44 Device page

[0576] 46 Device page

[0577] 48 Device front

[0578] 50 Device back

[0579] 52 front upper edge

[0580] 54 rear lower edge

[0581] 56 Section plane

[0582] 58 Focus

[0583] 60 distance

[0584] 62 distance

[0585] 64 Swivel caster

[0586] 66 Swivel caster axle

[0587] 68 Steering axle A 501 244 z October 17, 2025 z-390 / 415

[0588] - 75 -

[0589] 70 wheel

[0590] 72 Wheel axle

[0591] 74 swivel caster diameter

[0592] 76 wheel diameter

[0593] 78 fans

[0594] 80 fan impeller

[0595] 82 Fan drive

[0596] 84 Fan impeller axle

[0597] 86 wheel projection area

[0598] 88 wastewater tanks

[0599] 90 fresh water tanks

[0600] 92 Wastewater tank bottom

[0601] 94 Dirty Fleet Inlet

[0602] 96 Air outlet

[0603] 98 Jump back

[0604] 100 lead

[0605] 102 Befü Hope

[0606] 104 Locking element

[0607] 106 Liquid container coupling device

[0608] 108 Coupling element

[0609] 110 coupling element

[0610] 112 Coupling element

[0611] 114 Locking lever

[0612] 116 Handle section

[0613] 118 Liquid container holder

[0614] 120 Fresh water tank bottom

[0615] 122 Fresh water outlet

[0616] 124 valve

[0617] 126 Fresh water pump

[0618] 128 Container carrying handle

[0619] 130 handle section

[0620] 132 Swivel axis

[0621] 134 Handle locking element A 501 244 z 17 October 2025 z-390 / 415

[0622] - 76 -

[0623] 136 Exclusion

[0624] 138 thighs

[0625] 140 Separation device

[0626] Channel 142

[0627] 144 container lids

[0628] 146 Drainage area

[0629] 148 Container storage space

[0630] 150 deflection range

[0631] Channel 152

[0632] 154 Channel Inlet

[0633] 156 Deflection bends

[0634] 158 Cleaning device hose

[0635] 160 hose connection

[0636] 162 recess

[0637] 164 distance

[0638] 166 steps

[0639] 168 Suction device inlet

[0640] 170 Suction device outlet

[0641] 172 Exhaust outlet

[0642] 174 Filter unit

[0643] 176 Suction unit chamber

[0644] 178 Technical Chamber

[0645] 180 Control and / or regulating device

[0646] 182 cleaning agent containers

[0647] 184 Cleaning agent dosing device

[0648] 186 Cleaning agent pump

[0649] 188 Hose fastening device

[0650] 190 rubber loop

[0651] 192 hooks

[0652] 194 Device handle

[0653] 196 Accessory mount

[0654] 198 connection cables

[0655] 200 plugs A 501 244 z

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[0657] - 77 -

[0658] 202 Connection cable holding device

[0659] 204 Holding advantage

[0660] 206 Longitudinal axis of the retaining projection

[0661] 208 Safety margin

[0662] 210 Transport equipment

[0663] 212 users

[0664] 214 Back

[0665] 216 Transport handle

[0666] 218 Transport handle section

[0667] 220 carrying pads

[0668] 222 Direction of withdrawal

[0669] 224 Extension angle

[0670] 226 Device rear level

[0671] 228 Arm

[0672] 230 shoulder

[0673] 232 Hand

[0674] 234 Floor

[0675] 236 Device handle section

[0676] 238 Stair support device

[0677] 240 steps

[0678] 242 steps

[0679] 244 Support element

[0680] 246 support surface

[0681] 248 Stairs

[0682] 250 main switches

[0683] 252 Top

[0684] 254 Energy storage device

[0685] 256 Battery

[0686] 258 suction device

[0687] 260 cushions

[0688] 262 pieces of seating furniture

[0689] 264 Handpiece

[0690] 266 free end A 501 244 z 17 October 2025 z-390 / 415

[0691] - 78 -

[0692] 268 Suction nozzle

[0693] 270 Intake

[0694] 272 Suction channel

[0695] 274 Coupling device

[0696] 276 Liquid outlet

[0697] 278 Spray nozzle

[0698] 280 cleaning element

[0699] 282 Brush roller

[0700] 284 roller bodies

[0701] 286 bristle bundles

[0702] 288 Roller axle

[0703] 290 Grip area axis

[0704] 292 Grip area

[0705] 294 Drive unit

[0706] 296 gear

[0707] 298 gear

[0708] 300 gear

[0709] 302 Suction system element

[0710] 304 Suction system area

[0711] 306 Breakthrough

[0712] 308 slots

[0713] 310 slot length

[0714] 312 slot width

[0715] 314 Slot longitudinal direction

[0716] 316 Crossbar

[0717] 318 Slot section

[0718] 320 length

[0719] 322 width

[0720] 324 Suction nozzle bodies

[0721] 326 Nozzle attachment

[0722] 328 Connecting element

[0723] 330 Connecting element

[0724] 332 Rastvorsprung A 501 244 z

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[0726] - 79 -

[0727] 334 Rest recess

[0728] 336 Nozzle attachment coupling section

[0729] 338 Suction nozzle body coupling section

[0730] 340 recording

[0731] 342 Cross section

[0732] 344 Bellows element

[0733] 346 Suction channel

[0734] 348 Fluid hose

[0735] 350 Fluid channel

[0736] 352 Sight glass

[0737] 354 Housing part

[0738] 356 recording

[0739] 358 particle sensor

[0740] 360 control unit

[0741] 362 Cleaning agent dispensing device

[0742] 364 Grip area top

[0743] 366 Grip area back

[0744] 368 first control element

[0745] 370 second control element

[0746] 372 third control element

[0747] 374 Cleaning fluid pump

[0748] 376 fourth control element

[0749] 378 Display unit

[0750] 380 first display element

[0751] 382 second display element

[0752] 384 third display element

[0753] 386 Operating status indicator

[0754] 388 thumbs up

[0755] 390 middle fingers

[0756] 392 Index finger

[0757] 394 fourth display element

[0758] 396 first level indicator element

[0759] 398 second level indicator element A 501 244 z 17 October 2025 z-390 / 415

[0760] - 80 -

[0761] 400 third level indicator element

[0762] 402 Control device

[0763] 404 Sensor device

[0764] 406 Data processing equipment

[0765] 408 connecting cables

[0766] 410 Vacuum sensor

[0767] 412 Suction flow guidance

[0768] 416 free end

[0769] 418 Center area

Claims

A 501 244 z October 17, 2025 z-390 / 415 - 81 - Patent claims 1. Cleaning device (10), in particular in the form of a spray extraction device (12), comprising a cleaning device body (14), wherein a suction device (16), at least one liquid container (18) for receiving a dirty water liquor sucked up with the suction device (16) and a transport device (20) with at least one wheel (22) are arranged or formed on the cleaning device body (14), wherein the transport device (20) defines a support level (24) projecting above an underside (26) of the cleaning device body (14), characterized in that the suction device (16) is positioned between the support level (24) and the at least one liquid container (18).

2. Cleaning device according to claim 1, in particular according to the preamble of claim 1, characterized in that the cleaning device body (14) has a device top (28) which is parallel or substantially parallel to the device bottom (26) and / or to the support plane (24), that the cleaning device body (14) defines a vertical axis (30) which is transverse, in particular perpendicular, to the support plane (24), that a device height (24) parallel to the vertical axis (30) corresponds to a distance (36) of the device top (28) from the support plane (24), and that the device height (34) is greater than both a device length (42) and a device width (40) of the cleaning device body (14) in any section plane transverse, in particular perpendicular, to the vertical axis (30).

3. Cleaning device according to claim 2, characterized in that the device width (40) is defined as a distance between two device sides (44, 46) facing away from each other and that the device length (42) is defined as a distance between a device front (48) and a device rear (50) facing away from the device front (48), wherein in particular A 501 244 z October 17, 2025 z-390 / 415 - 82 - a) a cutting plane (56) of the cleaning device (10) which includes a front upper edge (52) formed between the front of the device (48) and the top of the device (28) and a rear lower edge (54) formed between the rear of the device (50) and the bottom of the device (26), which intersects the drive mechanism (20), the suction device (16) and the at least one liquid container (18) and / or b) the cleaning device body (14) is cuboid or substantially cuboid and that the front of the device (48) is aligned parallel or substantially parallel to the rear of the device (50) and that the two sides of the device (44, 46) are aligned parallel or substantially parallel to each other and / or c) a distance (60, 62) of the center of gravity (58) of the cleaning device body (14) from the rear of the device (50) is smaller than from the front of the device (48).

4. Cleaning device according to one of the preceding claims, characterized in that the driving device (20) comprises at least two wheels (22), in particular at least three or four wheels (22), wherein in particular at least one wheel (22), in particular two wheels (22), are designed to be steerable.

5. Cleaning device according to claim 4, characterized in that at least two wheels (22) are designed in the form of running wheels (70) and define a common running wheel axis (72) which runs parallel to the support plane (24) and in the direction of the device width (40), wherein in particular the cleaning device body (14) defines a device front (48) and a device rear (50) and that the two running wheels (70) project at least partially over both the device underside (26) and the device rear (50). A 501 244 z October 17, 2025 z-390 / 415 - 83 - 6. Cleaning device according to claim 5, characterized in that the suction device (16) comprises a fan (78) with a driven fan impeller (80) for conveying air and that the fan impeller (80) is arranged or formed between the impeller axis (72) and the at least one liquid container (18), wherein in particular a fan drive (82) of the fan impeller (80) is arranged or formed between the two impellers (70), wherein in particular the impeller axis (72) intersects the fan drive (82).

7. Cleaning device according to claim 5 or 6, characterized in that a) a perpendicular projection of the wheels (70) onto the base plane (24) defines a wheel projection surface (86) and that a perpendicular projection of the center of gravity (58) of the cleaning device body (14) onto the base plane (24) lies within the wheel projection surface (86) and / or b) the cleaning device (10) can be pivoted from a stationary position in which the base plane (24) is oriented perpendicular to the direction of gravity (32) about the wheel axis (72) into a pulling position and that the center of gravity (58) of the cleaning device body is positioned above or substantially above the wheel axis (72) in the pulling position and / or c) the transport device (20) comprises two wheels (22) in the form of swivel casters (64) which project at least partially beyond the underside (26) of the device.that the steering casters (64) define steering caster axes (66) running parallel to the support plane (24) and that the steering casters (64) are rotatable about steering axes (68) parallel or substantially parallel to the vertical axis (30).

8. Cleaning device according to one of claims 2 to 7, characterized in that the at least one liquid container (18) forms at least a part of the device top (28). A 501 244 z October 17, 2025 z-390 / 415 - 84 - 9. Cleaning device according to one of claims 3 to 8, characterized in that the at least one liquid container (18) forms at least a part of the device front (48).

10. Cleaning device according to one of the preceding claims, characterized in that the at least one liquid container (18) is designed in the form of a dirty water container (88), wherein in particular a dirty water inlet (94) and an air outlet (96) are arranged or formed on a dirty water container bottom (92) of the dirty water container (88).

11. Cleaning device according to one of the preceding claims, characterized in that the cleaning device (10) comprises two liquid containers (18) and that one liquid container (18) is designed in the form of a fresh water container (90), wherein in particular a) the fresh water container (90) forms a part of the front of the device (48) and / or b) the dirty water container (88) has at least one recess (98), in particular two recesses (98), for positively or substantially positively receiving a corresponding projection (100) of the fresh water container (90) and / or c) has a filling opening (102) and that the filling opening (102) points towards the dirty water container (88), wherein in particular the filling opening (102) is arranged or formed between the projections (100) of the fresh water container (90).

12. Cleaning device according to claim 11, characterized in that A 501 244 z October 17, 2025 z-390 / 415 - 85 - a) the two liquid containers (18) are designed to be detachably connected to one another and that the two liquid containers (18) are completely separated from each other in a separation position and coupled to each other in a working position, wherein in particular the wastewater container (88) overlaps the fresh water container (90) at least partially, in particular completely, in the working position, and / or b) the cleaning device (10) comprises a liquid container coupling device (106) for coupling the two liquid containers (18) with first and second coupling elements (108, 110, 112) arranged or formed on the two liquid containers (18), which are disengaged in the separation position and which are engaged by force and / or form in the working position, and / or c) a fresh water outlet (122) is arranged or formed on a fresh water container bottom (120) of the fresh water container (90).

13. Cleaning device according to one of the preceding claims, characterized in that the at least one liquid container (18) comprises a container carrying handle (128) pivotable about a pivot axis (132) extending parallel to the support plane (24), wherein in particular the container carrying handle (128) a) is arranged or formed on the dirty water container (88) and / or b) comprises at least one handle locking element (134) which engages with the cleaning device body (14) in a locking position in a force-fit and / or form-fit manner and / or A 501 244 z October 17, 2025 z-390 / 415 - 86 - c) comprises a handle section (130) extending parallel to the base plane (24), which in the locked position covers the at least one liquid container (18) on the front of the device (48).

14. Cleaning device according to one of the preceding claims, characterized in that the at least one liquid container (18) comprises a separation device (140) for separating liquid and gaseous components of the dirty water absorbed by the cleaning device (10), wherein in particular the separation device (140) a) is arranged or formed in the dirty water container (88) and / or b) comprises at least one, in particular two, separation stages.

15. Cleaning device according to one of claims 2 to 14, characterized in that the at least one liquid container (18) comprises a container lid (144) and that the container lid (144) forms a part of the device top (28), wherein in particular the separating device (140) is at least partially arranged or formed in the container lid (144).

16. Cleaning device according to one of claims 3 to 15, characterized in that the cleaning device (10) comprises a cleaning device hose (158) and that a hose connection (160) is arranged on the front of the device (48) or in the area of ​​the front of the device (48) for permanent or detachable connection to the cleaning device hose (158), wherein in particular a) the hose connection (160) is recessed into the cleaning device body (14) relative to the front of the device (48) and / or A 501 244 z October 17, 2025 z-390 / 415 - 87 - b) the hose connection (160) is guided or positioned below the at least one liquid container (18) in the cleaning device body (14) and / or c) a distance (164) of the hose connection (160) from the support level (24) is greater than a stair pitch (166) defined in DIN 18065, in particular greater than at least 14 cm, and further in particular greater than at least 20 cm, and / or d) a distance (164) of the hose connection (160) from the support level (24) is at least about one third of the device height (34) and / or e) a recess (16) for at least partially receiving the cleaning device hose (158) and / or the hose connection (160) is formed on an underside of the fresh water container (90).

17. Cleaning device according to one of claims 2 to 16, characterized in that the cleaning device body (14) comprises a liquid container receptacle (118) for receiving the at least one liquid container (18) in an operating position of the cleaning device (10) and that the liquid container receptacle (118) is open in the direction towards the top of the device (28), wherein in particular the liquid container receptacle (118) is open a) in the direction towards the front of the device (48) and / or b) in the direction towards the sides of the device (44, 46), wherein in particular the dirty water inlet (94) is fluidly connected to the hose connection (160) and that the air outlet (96) is fluidly connected to a suction-side suction device inlet (168) of the suction device (16). A 501 244 z October 17, 2025 z-390 / 415 - 88 - 18. Cleaning device according to one of the preceding claims, characterized in that a pressure-side suction device outlet (170) of the suction device (16) is fluidly connected to an exhaust air outlet (172) of the cleaning device (10), wherein in particular a) a filter device (174) is arranged or formed between the suction device outlet (170) and the exhaust air outlet (172), wherein in particular the filter device (174) comprises at least one filter element, in particular in the form of an activated carbon filter, and / or b) the exhaust air outlet (172) is arranged or formed on the underside (26) of the device.

19. Cleaning device according to one of the preceding claims, characterized in that the cleaning device body (14) comprises a suction device chamber (176), that the suction device (16) is received in the suction device chamber (176) and that the at least one liquid container (18) is arranged above the suction device chamber (176).

20. Cleaning device according to one of the preceding claims, characterized in that the cleaning device body (14) comprises a technical chamber (178) for receiving, in particular, a control and / or regulating device (180) of the cleaning device (10), wherein, in particular, the technical chamber (178) is arranged or formed adjacent to the rear of the device (50), wherein, in particular, a) the technical chamber (178) is arranged or formed above the suction device chamber (176) and / or b) the technical chamber (178) is adjacent to the at least one liquid container (18) in the operating position. A 501 244 z October 17, 2025 z-390 / 415 - 89 - and / or c) a cleaning agent container (182) and / or a cleaning agent dosing device (184) are included in the technical chamber (178), wherein in particular the cleaning agent container (182) is removable from the technical chamber (178), and / or d) the technical chamber (178) forms part of the top of the device (28) and / or e) a fresh water pump (126) and / or a cleaning agent pump (186) are included in the technical chamber (178).

21. Cleaning device according to one of the preceding claims, characterized in that a) a hose fastening device (188) is arranged or formed on the cleaning device body (14) for fastening a cleaning device hose (158) during transport of the cleaning device (10) and / or b) an accessory receptacle (196) is arranged or formed and / or c) a connection cable holding device (202) is arranged or formed, wherein in particular the connection cable holding device (202) comprises two spaced-apart retaining projections (204) and that a locking projection (208) is arranged or formed on at least one of the two retaining projections (204) and is rotatable about a longitudinal axis (206) of the retaining projection (204) and projects transversely, in particular vertically, with respect to the longitudinal axis (206) of the retaining projection.

22. Cleaning device according to one of the preceding claims, characterized in that the at least one liquid container (18) is designed to be detachably connectable to the cleaning device body (14). A 501 244 z October 17, 2025 z-390 / 415 - 90 - 23. Cleaning device according to one of the preceding claims, characterized in that the cleaning device (10) comprises a transport device (210) for moving the cleaning device (10) by a user (212), wherein in particular the transport device (210) comprises a back carrying device, which is in particular arranged or formed on the rear of the device (50).

24. Cleaning device according to claim 23, characterized in that the transport device (210) comprises a transport handle (216) with a transport handle section (218) extending parallel to the support plane (24), wherein in particular a) a carrying pad (220) pointing towards the cleaning device body (14) is arranged or formed on the transport handle section (218) and / or b) the transport handle (216) is arranged or formed on the cleaning device body (14) in a pivotable or extendable manner, in particular telescopically.

25. Cleaning device according to claim 24, characterized in that the transport handle (216) in a storage position of the cleaning device (10) is pushed forward as far as possible towards the cleaning device body (14) or pivoted towards it, wherein in particular the transport handle (216) a) defines an extension direction (222) such that the extension direction (222) with the vertical axis includes an extension angle (224) and that the extension angle (224) has a value in the range of 0° to about 25°, in particular in the range of 0° to about 15°, and / or A 501 244 z October 17, 2025 z-390 / 415 - 91 - b) is arranged or designed to be extendable from the top of the device (28) near the rear of the device (50) from the cleaning device body (14).

26. Cleaning device according to claim 25, characterized in that the transport handle section (218) projects beyond a device rear plane (226) defined by the device rear (50) in an extended, in particular a maximally extended, transport position of the transport handle (216).

27. Cleaning device according to one of claims 24 to 26, characterized in that a device handle (194) is arranged or formed on the cleaning device body (14) with a device handle section (236) extending parallel to the support plane (24) and that the transport handle section (218) rests against or abuts the device handle section (236) in the storage position.

28. Cleaning device according to one of the preceding claims, characterized in that the cleaning device (10) comprises a stair support device (238) for supporting the cleaning device placed on a stair step (240) on a lower stair step (242), wherein in particular the stair support device (238) comprises an extendable support element (244), that the support element (244) has at least one support surface (246) extending parallel to the support plane (24), that the at least one support surface (246) is retracted relative to the support plane (24) in a transport position of the cleaning device (10) and projects beyond the support plane (24) in a support position.

29. Cleaning device according to one of the preceding claims, characterized in that the cleaning device (10) A 501 244 z October 17, 2025 z-390 / 415 - 92 - a) comprises a main switch (250) and that the main switch (250) is arranged or designed on a top surface (28) of the device, in particular in the area of ​​a top surface (252) of the technical chamber (178), and / or b) has a mains connection and can be connected to a mains supply via a connecting cable (198) and / or c) comprises an electrical energy storage device (254) for the mains-independent operation of the cleaning device (10) and / or d) is designed in the form of a spray extraction device (12) or in the form of a suction device (258).

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