Motorhome with kitchen worktop

Abstract

A residential vehicle (1), in particular a caravan, motorhome or the like, comprising a vehicle body (2) and a living area (3), wherein a kitchen unit (4) is arranged in the living area (3) and is permanently connected to the vehicle body (2), wherein the kitchen unit (4) comprises in particular a sink (5) with water supply and a hob (6), wherein the kitchen unit (4) comprises at least one kitchen worktop (7) which is an integral part of the kitchen unit (4), characterized in that the kitchen worktop (7) has at least one magnetic element (9) arranged in a receiving space (8) of the kitchen worktop (7), whereby an adhesion zone (10) is formed in the kitchen worktop (7) which is configured to enter into a direct magnetic coupling with a magnetically effective user object (11), in particular a kitchen utensil and / or a dish, through a cover layer (12) of the kitchen worktop (7).

Description

[0001] The invention relates to a motorhome. The invention further relates to a kitchen worktop.

[0002] Motorhomes, such as caravans or trailers, are becoming increasingly popular. They provide users with living space during leisure time, for example on vacation, complete with the usual amenities, especially a kitchen. This allows users to have living space and cooking facilities almost anywhere they choose. The motorhome can be moved from the user's home to their desired holiday destination and used there.

[0003] However, moving the caravan also means that the kitchen utensils and dishes used in the kitchen are moved along with it. These are then subjected to the accelerations experienced during the journey, so a kitchen utensil standing on a kitchen countertop, such as a coffee machine, can slide across the countertop and fall off during a turn or braking maneuver. This poses a potential risk of damage, meaning that users often have to laboriously pack their desired kitchen utensils in transport containers before setting off and unpack them upon arrival at their destination. This represents a loss of convenience.

[0004] For this reason, there is a need to securely hold kitchen utensils and dishes against slipping on a kitchen worktop during the accelerations that occur during a journey.

[0005] The object of the invention is therefore to propose a motorhome which has a kitchen worktop integrated into a kitchen unit, designed in such a way that kitchen utensils and appropriately designed dishes placed on it are held securely against slipping even while the motorhome is in motion.

[0006] While solutions exist that demonstrate how to hold objects on moving surfaces, DE 20 2010 004 867 U1, for example, discloses a device for fixing movable parts in which magnetizable, ring-shaped support holders are arranged on a magnetic base, and the movable parts are then clamped in the support holder by means of clamping force.

[0007] However, such a solution is unsuitable for use on a kitchen worktop to fix kitchen utensils and dishes, and is also impractical for the user.

[0008] First, it relies on separate support brackets that must be placed on the surface. Before each use, the user must plan, prepare, and correctly align the required number, size, and position of these support brackets. This slows down the process, obstructs the work surface, and results in additional parts that can get lost, dirty, or require cleaning. A kitchen countertop effectively becomes a workbench with auxiliary equipment, rather than a smooth, readily available work surface.

[0009] Secondly, the concept of support brackets reduces the free arrangement of utensils. Support brackets surround and clamp an object; therefore, the object can only be placed where a bracket has been previously positioned, and only in the corresponding geometry. However, a typical coffee machine, kettle, or knife block has different footprints, sometimes with multi-point feet or irregular base contours. Different support brackets would be needed for each of these cases, often multiple brackets. The worktop thus loses its universal usability.

[0010] Thirdly, installing support brackets worsens hygiene and cleanability. The brackets create gaps, edges, and crevices where food residue and liquids can accumulate. Seamless wiping, as with a normal kitchen countertop, is then no longer possible. In a kitchen environment, this is impractical and undesirable.

[0011] Fourth, the known solution is dynamically unstable: The support holders themselves are held to the base solely by their magnetic field. Driving vibrations, potholes, or braking maneuvers exert shear forces and impacts on the ring and the object. If the support holder detaches even slightly or moves across the surface, the entire assembly becomes unstable. The holding effect is indirect, via the support holder; there is no direct magnetic coupling between the object and the base. Therefore, the object can shift within the ring or tip out of it.

[0012] Fifthly, the solution is unsatisfactory from both a design and manufacturing perspective. Motorhome customers expect a visually seamless, high-quality worktop. The added support brackets give the impression of a makeshift solution and contradict the desire for a "normal"-looking, smooth work surface without any visible hardware.

[0013] Finally, the existing solution is logistically inefficient: The operator has to carry, sort, and store a set of support brackets in various diameters. Missing or incorrectly sized support brackets lead to usage restrictions precisely when it matters most (spontaneous relocation, short-notice departure).

[0014] To solve this problem, the invention proposes a residential vehicle, in particular a caravan, motorhome, or the like, comprising a vehicle body and a living area. A kitchen unit, permanently connected to the vehicle body, is arranged in the living area. This unit includes, in particular, a sink with a water supply and a cooktop. The kitchen unit also includes at least one worktop, which is an integral part of the unit. The residential vehicle is characterized in that the worktop has at least one magnetic element arranged in a receiving area of ​​the worktop, thereby forming an adhesion zone in the worktop. This zone is designed to establish a direct magnetic coupling with a magnetically effective object, in particular a kitchen utensil and / or a piece of tableware, through a surface layer of the worktop.

[0015] Compared to the prior art, the present invention thus allows for a direct, planar magnetic coupling between the top layer of the integrated kitchen worktop and a magnetizable base segment of the utensil. No additional components are required. The entire surface area within the adhesion zone is available as a universal holding surface. The user can freely place any kitchen utensil within the adhesion zone; the worktop remains smooth, hygienic, and immediately wipeable, and the holding function is immediate and therefore robust against the accelerations and vibrations occurring during operation.

[0016] For the purposes of this application, "residential vehicle" refers to a road vehicle that has a living area intended for occupancy. The term includes caravans and motorhomes, including campervan conversions based on van chassis. Preferably, the residential vehicle is registered for use on public roads.

[0017] The "vehicle body" is the load-bearing structure of the motorhome, comprising the floor, side walls, and roof, as well as any permanently attached fixtures and reinforcements of the furniture structure. In particular, the vehicle body may include attachment points for permanently installed furniture.

[0018] For the purposes of this application, "living area" refers to an area of ​​the vehicle body that is not used for driving the vehicle and allows for living, cooking, sleeping, or similar activities. The living area may be spatially separated from the driver's or cockpit area.

[0019] "Vehicle-mounted" means permanently and securely connected to the vehicle body. This can mean screwed, riveted, or glued. It can also mean that an item is not intended as a loose or easily removable accessory. Preferably, the connection withstands the vibration and crash loads of driving.

[0020] A "kitchen unit" can be a furniture unit located in the living area, particularly one with a cabinet body, designed to accommodate kitchen functions, and can specifically include a kitchen worktop. In particular, the kitchen unit can include a sink with a water supply and / or a cooktop (gas, 12 / 24 V, or 230 V). A kitchen unit can have cabinet compartments, pull-out appliance drawers, and covers. However, the term "kitchen unit" may also refer to other furniture located in the living area of ​​the motorhome, in particular a table. In this case, it is a kitchen unit that does not include a sink with a water supply and / or a cooktop.

[0021] In particular, the invention also proposes a residential vehicle, especially a caravan, motorhome, or the like, comprising a vehicle body and a living area. A table is arranged in the living area and is fixedly connected to the vehicle body. The table has at least one tabletop that is an integral part of the table. The residential vehicle is characterized in that the tabletop has at least one magnetic element arranged in a receiving space of the tabletop, thereby forming an adhesion zone in the tabletop. This zone is designed to establish a direct magnetic coupling with a magnetically effective object, in particular a kitchen utensil and / or a piece of tableware, through a surface layer of the tabletop.

[0022] If they are placed on the kitchen worktop, the following characteristics may also apply to the tabletop.

[0023] "Integral component" means that the kitchen worktop or tabletop is structurally integrated into the kitchen furniture. This can mean that the kitchen worktop or tabletop is firmly attached to the kitchen furniture, supported by a surface-mounted fixing, and / or flush-mounted, and in particular, is not intended as a loose, freely movable surface. Preferably, the kitchen worktop or tabletop is flush with surrounding built-in components within the kitchen furniture.

[0024] A "receiving space" of the kitchen worktop or tabletop can be an internal cavity within the worktop or tabletop in which functional components, in particular the at least one magnetic element, are embedded. Preferably, the functional component is encapsulated (e.g., by means of potting or as a cavity with a cover) without penetrating the closed surface layer. In particular, the receiving space can be part of a sandwich or cassette construction.

[0025] The term "magnetic element" can encompass a magnetic arrangement that includes at least one magnetic source, such as a permanent magnet and / or an electromagnet. The magnetic element can additionally include a soft magnetic field-guiding or shielding structure, for example, in the form of a return yoke or side shields. The magnetic element can be implemented modularly or as a continuous unit.

[0026] The "adhesion zone" is the surface area of ​​the kitchen worktop or tabletop above which at least one magnetic element establishes an effective magnetic coupling with a magnetically active object. "Above" here refers to the position of a motorhome parked and roadworthy on the street.

[0027] A "utility item" is an object intended for use in a kitchen and placed on the kitchen worktop or tabletop. Examples of utility items include coffee makers, kettles, knife blocks, pots, and containers. Specifically, the utility item has a magnetically effective base segment (i.e., a magnetizable and / or ferromagnetic base segment) on its underside. The magnetically effective base segment can be integrated or retrofitted. The utility item is not a separate, surface-mounted support element, particularly not a ring-shaped support or the like. The kitchen worktop or tabletop is designed in such a way that the holding function acts directly between the worktop and the utility item.

[0028] For the purposes of this application, a kitchen utensil is a work or household appliance used in a kitchen, such as a coffee machine, kettle, mixer, knife block, or storage container. A dishware item is tableware or cookware, in particular glasses, cups, plates, bowls, cutlery, and the like. Preferably, kitchen utensils / dishware items are magnetically effective via their base segment.

[0029] The "top layer" in the context of the invention is the upper, closed finishing layer of the kitchen worktop or tabletop, which forms the work and storage surface. It can be seamless and / or easy to clean.

[0030] The term "magnetic coupling" can refer to the force-fit coupling between the magnetic element and the magnetizable base segment of the object through the top layer, with an additional normal force F. m be those that are determined by the normal component of the flux density B acting at the surfacez depends. "Direct" here can mean without intermediate holding or support elements placed on the surface.

[0031] The coupling can be planar. "Planar" can mean a contact or coupling area exceeding a minimum proportion, thereby improving sliding and tilting stability and preventing cogging torque. Preferably, a homogeneous flux density plateau with low variance is formed in the interior of the adhesion zone, while increased lateral gradients at the edges limit drift of the workpieces.

[0032] According to a further feature of the invention, the kitchen worktop has a closed, flat surface layer which has a flatness of less than 2 mm based on a measuring length of 600 mm.

[0033] The exceptionally flat surface layer further strengthens the magnetic connection between the kitchen worktop and the item being used. This ensures that the item is held securely in place while the caravan is in motion. The closed, flat surface layer guarantees full, repeatable contact with the base of the item; this increases friction and coupling, and allows for hygienic, easy cleaning. At the same time, this design maintains a consistent air gap above at least one magnetic element, which stabilizes the magnetic coupling.

[0034] "Closed" as used in the invention can mean a continuous, virtually seamless and low-porosity surface layer that completely forms the work and storage area. It can mean without any continuous openings, seams, or joints within the bonding zone. Preferably, transitions to built-in components, such as a cooktop and / or sink, are flush with a step height of ≤ 0.3 mm and a gap width of ≤ 0.5 mm. A closed surface as defined in the invention can be designed as a monolayer or as a bonded layer on the top side and is resistant to common household cleaning agents.

[0035] "Flatness" as used in the invention can mean that the surface layer has a flatness deviation of ≤ 2 mm (total indicator value) over a measuring length of 600 mm. "Flatness deviation" is the maximum distance between two parallel enveloping planes that enclose the surface above and below. The flatness deviation can be measured according to DIN EN ISO 1101.

[0036] To control the distortion that occurs when inserting at least one magnetic element—for example, due to adhesive shrinkage, unequal thermal expansion, or asymmetrical moisture absorption—the kitchen worktop or tabletop can be designed with low distortion. For this purpose, the kitchen worktop or tabletop can be constructed using a symmetrical sandwich design. The at least one magnetic element can be positioned close to the neutral axis, and / or the top and bottom layers can be balanced in terms of thickness, modulus of elasticity, and thermal expansion. Preferably, the sandwich symmetry is chosen to minimize self-bending moments. Furthermore, a soft magnetic backing yoke can be provided on the underside, which also serves as a stiffening element. Preferably, its thickness is uniform across the bonding zone to avoid local stress gradients. Additionally, a low-shrinkage adhesive or...A potting system is used, in particular reactive resins or MS polymers with a volume shrinkage of ≤ 1%. Preferably, the coating is applied to both sides or as a continuous (rather than spot) bond, optionally with fillers to reduce shrinkage. For material-specific adaptation, a CTE (Coefficient of Thermal Expansion) adjustment can be made between the top / bottom layer and the magnetic / yoke structure. Preferably, a moisture and / or vapor barrier, for example in the form of a metallized film, is also arranged on the underside to limit asymmetric moisture absorption. Alternatively or additionally, the panel can have a lightweight core (e.g., honeycomb or foam core) with closed surface skins and reinforcing ribs on the underside. Preferably, a circumferential frame web stabilizes the edge zone.Furthermore, at least one magnetic element can be housed in modular pockets with uniform wall thickness and either encapsulated or bonded across its entire surface. Preferably, a defined minimum distance to the surface layer is maintained to keep the air gap and thus the coupling constant. A counter-tensioning or pre-tensioning strategy can also be employed, in particular the use of counter-tension layers, especially fiber layers with a suitable orientation, and / or curing under pre-tension, so that the panel aligns flat after release. Preferably, a tempering process is carried out to relax residual stresses. Advantageously, the furniture connection can be floating, i.e., via defined support points with elastomeric decoupling, so that constraints are reduced and any remaining distortions are not transferred to the visible surface.Finally, the process can be designed to reduce distortion, in particular by curing on a flat reference table or in a vacuum bag, by defined temperature cycles before final measurement, and by a flatness test after a climate change.

[0037] According to a further feature of the invention, the adhesion zone extends over at least 60%, preferably at least 75%, and more preferably at least 85% of an upwardly facing surface of the kitchen worktop.

[0038] The large surface area of ​​the grip zone allows kitchen utensils and dishes to be freely placed within the normal working area of ​​the kitchen countertop and yet remain securely held even during typical accelerations. This eliminates the need for pre-positioned holding points and creates an intuitive workflow, as users can place items wherever they need them. The large grip zone results in largely uniform contact conditions across the majority of the surface and stabilizes the holding forces regardless of minor positional deviations. This improves user ergonomics, reduces setup times, and enables a seamless, wipeable work surface without any additional items resting on it.

[0039] Preferably, the adhesion zone is arranged continuously in the central area of ​​the kitchen worktop or tabletop and / or is set back from the edge areas, so that there is no effective holding area at the edge of the panel and drift towards the interior during vibrations is prevented.

[0040] According to a further feature of the invention, it is provided that an edge zone is formed on the circumferential edge of the kitchen worktop, into which the adhesion zone does not extend, wherein the edge zone preferably has a width of at least 30 mm, more preferably at least 50 mm, more preferably at least 75 mm, more preferably at least 100 mm.

[0041] The edge zone forms a non-stick safety and operating edge. This reduces the risk of an object moving to the outer edge and sliding over it during driving maneuvers. At the same time, it creates a convenient gripping and wiping area that facilitates cleaning and accommodates end caps, seals, or fasteners without affecting the holding function. The edge zone also acts as a buffer against stray particles and contributes to uniform coupling within the interior.

[0042] The perimeter is the outer edge of the upward-facing surface of the kitchen worktop, completely surrounding its outer contour. Cutouts and built-in elements can be part of the perimeter. Cutouts and built-in elements may not be part of the perimeter.

[0043] The phrase "does not extend" means that the adhesion zone in projection lies entirely within an inner boundary line that separates the edge zone from the interior, so that no effective holding function is provided in the edge zone.

[0044] Preferably, the edge zone is non-adherent in that the normal component of the magnetic flux density, measured at a height of 1 millimeter above the surface, lies below a predetermined threshold value, in particular below 50 mT, which precludes any holding effect. The width of the edge zone is defined at each point as the distance measured perpendicular to the local outer contour inwards in the plane of the top layer between the outer edge of the worktop and the inner boundary line of the edge zone.

[0045] According to a further feature of the invention, it is provided that in the adhesion zone at a measuring height of 1 mm above the upwardly facing surface, the normal component of the magnetic flux density on a measuring grid with a point spacing ≤ 10 mm at each measuring point is at least 80 mT, preferably at least 160 mT, more preferably at least 250 mT, and the relative inhomogeneity is ≤ 0.20.

[0046] The inventors have determined that such magnetic flux densities generate a particularly efficient, yet not excessively strong, holding force, ensuring that the object is held securely but can still be easily removed from the kitchen countertop. By defining a minimum value for the normal component of the magnetic flux density and a permissible relative inhomogeneity, the magnetic coupling is reproducible and uniform across the entire holding area. This results in comparable holding forces everywhere, reduces unwanted movement of objects, and eliminates perceptible detents. At the same time, the design remains flexible, as different internal magnet architectures can be used as long as the specified surface properties are met.

[0047] The normal component of the magnetic flux density is the component of the magnetic flux density that is directed perpendicular to the surface of the top layer. It is measured at the specified measurement height of 1 millimeter above the upward-facing surface using a suitable field probe.

[0048] The measurement grid is a two-dimensional, virtual arrangement of measurement points covering the entire adhesion zone in the plane of the top layer. The point spacing is the maximum linear distance between adjacent measurement points along two mutually perpendicular directions in the plane of the top layer. A point spacing of 10 millimeters or less means that adjacent measurement points are at most 10 millimeters apart in both the longitudinal and transverse directions. Areas near the edges are sampled such that the first measurement point is at most 10 millimeters from the inner boundary line of the adhesion zone. The measurement height at each point is 1 millimeter above the surface. The measurement of the normal component of the flux density is recorded for each measurement point.

[0049] Relative inhomogeneity is a measure of the uniformity of the normal component of the flux density within the adhesion zone. It is defined as the quotient of the difference between the largest and smallest measured values ​​and the arithmetic mean of all measured values ​​on the measurement grid within the adhesion zone. A relative inhomogeneity of less than or equal to 0.20 means that the range of the measured normal components is at most twenty percent of the mean value. This condition is met if all measured values ​​of the normal component at each measurement point on the measurement grid at a measurement height of 1 millimeter correspond at least to the specified minimum value and the described quotient does not exceed the stated limit. In a preferred embodiment, the relative inhomogeneity is less than or equal to 0.15, preferably less than or equal to 0.1.

[0050] According to a further feature of the invention, it is provided that a soft magnetic shielding layer with an effective relative permeability ≥ 100 and a thickness ≥ 0.5 mm is arranged below the at least one magnetic element, and / or lateral soft magnetic shielding elements are arranged along at least one edge region of the kitchen worktop.

[0051] The underside soft magnetic shielding layer deflects the magnetic field back and focuses it towards the top layer. This increases the effective normal component of the flux density at the surface for the same magnetic source. Simultaneously, stray fields into the base cabinet are significantly reduced. This improves the holding power in the storage area, protects electrical installations in the kitchen cabinetry, and increases electromagnetic compatibility. The shielding layer also acts as a stiffening component and contributes to a warp-resistant, flat worktop. Lateral shielding elements limit the field at the edges, creating a gentle field fence that reduces the drift of objects towards the perimeter.

[0052] A soft magnetic shielding layer is a ferromagnetic, low-coercivity layer positioned beneath at least one magnetic element, forming a magnetic return path. The shielding layer can be made of low-carbon steel, soft magnetic ferrites, or high-permeability alloys. It can cover the entire surface beneath the adhesion zone. It can extend laterally beyond the magnet in projection by a safety margin. It can be a single sheet or a multi-part, overlapping segment. The thickness is selected to prevent material saturation during operation and ensure a reproducible return path. The shielding layer can be bonded to the plate structure by force or material bonding. It can be coated with a corrosion-resistant layer. It can be decoupled by a thin spacer layer to compensate for adhesive shrinkage or thermal stresses.It can serve as a load-bearing stiffness layer and mechanically stabilize the sandwich structure.

[0053] In this application, the effective relative permeability is defined as the effective permeability ratio µ_r,eff in the installed state. It describes the ratio of the magnetic flux density in the material to that in air at the same magnetizing field strength, taking into account boundary conditions of the geometry and the magnetization. The effective relative permeability can be specified by the material properties. Alternatively, it can be determined by a quasi-static measurement in the final assembly or on a representative test specimen.

[0054] Lateral shielding elements are soft magnetic components along at least one edge of the kitchen worktop. They can be designed as L-profiles, U-channels, or flat strips. They can form a frame contour running in the plane of the surface layer. They can be discreetly positioned at particularly strong field boundaries. They can laterally concentrate the field lines and increase the lateral gradients at the transition to the edge zone. This creates a defined boundary of the adhesion zone without interrupting the surface. The shielding elements can be flush-mounted in the worktop structure. They can be protected against moisture and corrosion. They can also serve as mechanical edge reinforcement.

[0055] The shielding layer can have lateral recesses to reduce weight, while maintaining the backflow effect in the center of the adhesion zone. The shielding layer can be used in combination with a pole pattern arrangement. It can be dimensioned so that the flux density measured on the underside at a defined distance falls below a limit value. The shielding layer can be segmented in the plane of the panel if a coil is used to adjust the holding effect and limit eddy currents. The lateral shielding elements can be interrupted to accommodate the mounting points of the furniture carcass. The combination of shielding layer and lateral shielding elements can be designed as a closed backflow frame. This design increases field utilization on the top side, reduces stray fields on the underside, and improves the mechanical stability of the entire panel assembly.

[0056] According to a further feature of the invention, it is provided that the kitchen worktop, after a two-stage climate change test in which the kitchen worktop is first exposed for 24 hours to an ambient temperature of 40 °C and a relative humidity of 85% and subsequently exposed for 24 hours to an ambient temperature of 23 °C and a relative humidity of 50%, has a flatness deviation ≤ 3 mm per 600 mm measuring length.

[0057] The climate change test ensures that the kitchen worktop retains its flat geometry even after thermal and hygroscopic stress. This keeps the air gap above the at least one magnetic element uniform, the magnetic coupling reproducible across the entire adhesion zone, and the surface hygienically wipeable. Warping, local lifting, and adhesive shrinkage are controlled. This reduces fluctuations in holding power, prevents appliance vibrations, and minimizes the risk of customer complaints in the field.

[0058] The test specimen is the complete kitchen worktop in its final assembly. It includes at least one magnetic element, any shielding layer, all adhesives, and inserts. The attachment to the furniture frame is either physically implemented or simulated using a test frame with the intended contact points and tightening torques. Before testing begins, the specimen is conditioned for at least 24 hours at 23 degrees Celsius and 50 percent relative humidity. Phase one then follows, consisting of 24 hours of storage at 40 degrees Celsius and 85 percent relative humidity. This is immediately followed by phase two, which involves 24 hours of storage at 23 degrees Celsius and 50 percent relative humidity.The test is performed in a climate chamber with circulating air. The test specimen is positioned horizontally and freely accessible. Covers to the work surface are open or removed during the test. Temperature and relative humidity are maintained as target values ​​with standard tolerances of plus or minus two degrees Celsius and plus or minus five percent relative humidity. After completion of the second phase, an equilibration period of at least two hours is observed at twenty-three degrees Celsius and fifty percent relative humidity.

[0059] The flatness is then measured on the upward-facing surface. For this purpose, either a calibrated reference ruler with a length of 600 millimeters and a feeler gauge are applied longitudinally, transversely, and diagonally at at least three representative points in the adhesion zone. The largest measured gap width is the flatness deviation per 600 millimeters of measuring length. Alternatively, the surface is scanned in a grid pattern with a point spacing of no more than 25 millimeters. A best-fit plane is calculated. The flatness deviation is the difference between the maximum and minimum vertical distance of the measured points to this plane, evaluated in measurement fields of 600 by 600 millimeters. The requirement is met if the flatness deviation after the climate change test is no more than 3 millimeters per 600 millimeters of measuring length.

[0060] Preferably, the flatness is additionally determined before the start of the test, and the change in flatness between the initial and final states is at most one millimeter per 600 millimeters of measuring length. Preferably, a visual inspection for cracks, delamination, and edge lifting is also carried out. Preferably, the test is repeated with three consecutive cycles. Preferably, the worktop is held at the designated mounting points during the test to avoid clamping. Preferably, a cold phase at five degrees Celsius and thirty percent relative humidity is additionally provided if the operating profile includes winter conditions.

[0061] To control thermally induced warping, the kitchen worktop can be designed so that the top and bottom layers are balanced in thickness, stiffness, and thermal expansion, and that at least one magnetic element is located near the neutral axis. Preferably, materials with matching coefficients of thermal expansion are combined and / or a backing yoke of uniform thickness is used as a stiffening element on the underside, so that temperature changes do not generate unilateral bending moments. Bonding can be achieved with low-shrinkage and temperature-stable resin systems and / or a defined tempering process can be carried out for stress relief after curing. A uniform wall thickness of the magnetic pockets and / or a small air gap to the top layer, which is as constant as possible across the surface, stabilizes the connection even after temperature changes.

[0062] To control moisture-induced warping, a moisture and vapor barrier can be provided on the moisture-facing side, and the edges of the panel can be sealed on all sides to prevent asymmetrical moisture absorption. Preferably, the top and bottom layers are selected from materials with comparable moisture absorption, and the adhesives and sealants have low water absorption. A closed-cell or double-sided sheathed lightweight core can be used to reduce diffusion through the core. All components can be conditioned before joining at a defined temperature and relative humidity, and the furniture connection can be floating via elastomer-decoupled bearing points, so that residual expansion due to climate changes does not appear as visible warping on the top layer.

[0063] According to a further feature of the invention, the kitchen worktop has several magnetic elements in its receiving space, which are designed as an internal pole pattern with alternating polarity, wherein the pole spacing is in the range of 5-30 mm and is preferably designed as a striped, checkerboard or concentric ring pattern.

[0064] The internal pole pattern with alternating polarity generates a uniform normal component of the magnetic flux density with defined lateral gradients on the surface layer. This results in largely constant holding conditions in the interior of the adhesion zone, while a gentle field fence effect is achieved at the edges. Holding forces become reproducible across the surface, the tendency to move under driving vibrations decreases, and no perceptible detent points occur. At the same time, the design remains open to different construction methods, as various magnet geometries and materials can be used as long as the required surface field is achieved. A finer pole pitch improves homogeneity, while a coarser pole pitch increases gradient formation. Both can be adapted to the intended application.

[0065] An internal magnetic pattern is a magnetic array located within the surface area of ​​a kitchen worktop, consisting of multiple magnetic elements with recurring field polarity. The magnetic elements lie beneath the surface layer and are oriented to create a periodic or quasi-periodic field distribution on the upward-facing surface. The magnetic pattern can be composed of discrete permanent magnets, magnetized segments of a substrate, or a combination of these with soft magnetic field guides.

[0066] Alternating polarity means that adjacent polar regions alternately act as north and south poles. Along a main axis of the pattern, a north pole region is followed by a south pole region, and then another north pole region. In two-dimensional patterns, this alternation occurs in two perpendicular directions. This alternation results in a directed field pattern and thus definable gradients on the surface.

[0067] The polar division is the average distance between the centers of two polar regions with the same name, projected onto the plane of the top layer. For striped patterns, this is the distance between two consecutive north stripes. For checkerboard patterns, this is the edge length of the polar tile. For ring patterns, this is the radial distance between two concentric rings with the same name. A polar division in the range of five to thirty millimeters provides a practical compromise between homogeneity in the interior and sufficient gradient at the edges.

[0068] The striped pattern creates a pronounced field modulation in one direction. It is suitable for selectively enhancing the holding effect in the direction of travel or perpendicular to the direction of travel. A high degree of homogeneity can be achieved in the interior, while usable gradients are created along the edges of the stripes.

[0069] The checkerboard pattern creates an isotropic field distribution in two spatial directions. This minimizes torques on irregularly shaped objects and ensures that the holding conditions are largely the same in X and Y. This design is particularly suitable when objects are to be placed freely without a preferred orientation.

[0070] The concentric ring pattern creates a radially symmetrical field distribution with a central plateau and surrounding gradients. It is suitable for centrally used work areas and promotes a gentle attenuation towards the center. By alternating the ring polarities, the gradients can be finely adjusted across the radius.

[0071] Preferably, the pole pattern is supplemented by a soft magnetic backstop on the underside to focus the field upwards and increase homogeneity in the interior. Preferably, the pole pitch is adapted to the thickness of the top layer and the thickness of the magnetic sources so that the normal component of the flux density at a measurement height of one millimeter achieves the aforementioned values ​​across the adhesion zone.

[0072] According to a further feature of the invention, the magnetic elements are designed as a Halbach array, wherein the magnetization direction of adjacent segments is preferably rotated by 90° ± 15° relative to each other.

[0073] A Halbach array preferentially focuses the magnetic field towards the top layer and weakens it on the opposite side. This increases the effective normal component of the flux density at the surface for the same amount of magnets. Simultaneously, stray fields on the underside are reduced. The holding effect in the storage area becomes more efficient and uniform, and installations in the base cabinet are less affected.

[0074] A Halbach array is an arrangement of several magnetic segments whose magnetization directions are systematically varied within the array so that the field is amplified on one side of the array and largely compensated on the opposite side. The segmentation takes place within the working surface's footprint. A Halbach array consists of segments of permanent magnets whose magnetization directions are each tilted 90° relative to each other along the array's longitudinal axis. This causes the field lines to be closer together on the side toward which the field director is tilted, resulting in an increase in magnetic flux density. On the opposite side, the field lines are less dense than in an undisturbed magnet; therefore, the field weakens or disappears completely even at short distances, as the north and south poles alternate.

[0075] In principle, the magnetization directions of adjacent segments can also include an angle of less than 90°, which makes assembly more complex, but further improves the field concentration.

[0076] The phrase "magnetization direction of adjacent segments... rotated by 90 degrees plus or minus 15 degrees relative to each other" means that the direction of the magnetic moment is rotated stepwise from segment to segment. Ideally, the rotation is approximately 90 degrees. Deviations within a tolerance band of plus or minus 15 degrees are permissible. This continuous rotation creates the desired field focusing towards the top layer and the attenuation towards the bottom layer.

[0077] According to a further feature of the invention, it is provided that an adjustable soft magnetic shunt element is arranged in the kitchen worktop, which is adjustable between a first position with increased holding effect and a second position with reduced holding effect, wherein preferably the magnetic flux density at a measuring height of 1 mm above the upwardly facing surface of the kitchen worktop is at least 30% higher in the first position than in the second position.

[0078] The adjustable soft magnetic shunt element allows for a holding force adapted to the operating condition. When moving, the holding force can be increased, ensuring that kitchen utensils and dishes are reliably held during typical accelerations. When stationary, the holding force can be reduced, allowing the worktop to behave like a normal surface, and objects can be easily moved or removed without noticeable magnetic attraction. This increases safety and convenience and avoids unnecessary power consumption, as the adjustment is purely passive, achieved through magnetic feedback.

[0079] A shunt element is a soft magnetic component that influences the magnetic return path between the magnet source and the shielding layer, thereby controlling the flux density exiting towards the top layer. It can be designed as a sliding yoke slide, a pivoting flap, a rotatable segment ring, a telescopic yoke bridge, or a lamellar stack that moves between an open and a largely closed return position. The shunt element can be flush-mounted in the receiving space. It can be mounted with minimal play and coated with a corrosion-resistant material. Adjustment can be manual via a slide, lever, knob, or Bowden cable. Alternatively, it can be motorized. Preferably, defined end positions with tactile detents are provided, along with markings for the "Travel" and "Camp" positions.

[0080] Holding effect refers to the magnetically induced securing against lateral slippage. Technically, holding effect can be measured via the normal component of the magnetic flux density at a height of 1 millimeter above the top layer or via the resulting additional normal force on a magnetizable base segment. The holding effect is greater when the normal component increases at the surface and when the sliding condition is met, whereby the coefficient of friction multiplied by the sum of the weight force and the additional magnetic normal force is at least as large as the laterally acting inertial force at the specified acceleration. The aforementioned difference in flux density of at least thirty percent between the first and second positions can refer to measurement points in the adhesion zone on a grid with a point spacing of less than or equal to ten millimeters at a measurement height of 1 millimeter.The adjustment can be considered effective if this difference is maintained at all measuring points or at least in the middle area of ​​the adhesion zone.

[0081] Alternatively, an electromagnetic solution can be used instead of the shunt element. For this purpose, the at least one magnetic element comprises an excitable coil that allows the holding force to be adjusted by increasing or decreasing the flux density at the deck layer. Power can be supplied from the ship's electrical system at twelve or twenty-four volts. Preferably, overcurrent and temperature monitoring are provided, as well as a design in which the de-energized state provides a reduced holding force level. The electromagnetic adjustment can be combined with the mechanical shunt solution to achieve large adjustment ranges with low energy consumption.

[0082] According to a further feature of the invention, the top layer is provided to consist of wood, plastic, mineral material or glass.

[0083] The choice of material for the top layer allows for a smooth, closed, and hygienic work surface with high resistance to various media and good scratch and abrasion resistance. At the same time, the thickness of the top layer can be selected so that any desired air gap above the at least one magnetic element remains defined and the holding effect is reproducible.

[0084] For wood, lacquered or oiled solid wood, veneered core boards, and multiplex or HDF panels with a sealed surface are suitable. For plastics, thermosetting resin laminates such as HPL or CPL on a substrate are appropriate, as are thermoplastic panels made of PMMA, polycarbonate, or ABS with a hard, scratch-resistant coating. For mineral materials, acrylic-bonded solid surface materials based on aluminum hydroxide and quartz composites with a polymer matrix are suitable, each with a low-porosity, seamlessly polishable surface. Natural stone can also be considered a mineral material. For glass, chemically or thermally tempered single-pane safety glass, enamelled glass, and laminated glass with an abrasion-resistant coating are advantageous, with a satin or etched surface further enhancing grip.

[0085] According to a further feature of the invention, the magnetic flux density generated by the at least one magnetic element at the kitchen worktop is dimensioned at a measuring height of 1 mm above the surface layer such that a cylindrical reference test specimen with a mass of 3.0 kg and a plane-parallel, magnetizable base segment arranged on its underside with an effective coupling area of ​​50 cm² 2 and is held against slippage by a coefficient of friction µ_ref ≥ 0.30 against the top layer at an acceleration ≤ 0.5 g.

[0086] This ensures that the magnetic coupling between the kitchen worktop and the object being used is strong enough to allow for secure holding during the accelerations that typically occur during driving.

[0087] The effective coupling area is the planar projected area of ​​the contact zone between the underside of the magnetizable base segment of the test specimen and the top layer within the adhesion zone. Only the area that is in full contact under nominal load and transmits the additional magnetic normal force is considered. Recesses, chamfers, and non-contacting edge radii are not included in the coupling area. A thin protective or sliding layer is included in the coupling area if it is in full contact and transmits the normal force without significant air gaps. The determination can be carried out using a pressure-sensitive contact film with a defined contact force and subsequent area analysis. Alternatively, an optical contact surface analysis with a translucent interlayer can be used.

[0088] Held against slippage means that the reference test specimen, under uniform lateral acceleration up to and including 0.5 g in the direction of travel or perpendicular to the direction of travel, exhibits no sliding movement on a dry and clean surface layer for a test duration of ten seconds. After the acceleration subsides, no progressive movement is observed. The condition is considered fulfilled if the frictional force, consisting of the coefficient of friction and the sum of the weight force and the additional magnetic normal force, is at least equal to the lateral inertial force.

[0089] The invention further proposes a kitchen worktop that is an integral part of a kitchen unit arranged in a motorhome, characterized in that the kitchen worktop has at least one magnetic element arranged in a receiving space of the kitchen worktop, whereby an adhesion zone is formed in the kitchen worktop which is designed to enter into a direct magnetic coupling with a magnetically effective user object, in particular a kitchen utensil and / or a dish, through a top layer of the kitchen worktop.

[0090] The kitchen worktop provides the holding function as a self-contained component. At least one magnetic element positioned within the holding area generates an additional normal force on the magnetizable base segment of the object through the closed surface layer. This increases the frictional force between the object and the surface against lateral forces generated by driving dynamics, reliably preventing slippage during travel. The adhesive zone is large and homogeneous, allowing the user to freely place kitchen utensils and dishes within the holding area without the need for predefined placement points. The surface remains smooth, seamless, and hygienically wipeable, as no additional components are required and the magnetism is completely concealed within the worktop.

[0091] As a component, the kitchen worktop can be securely integrated into various kitchen units, making it equally suitable for series production and spare parts supply. Its internal structure ensures a defined air gap to the magnetic surface, guaranteeing reproducible holding power and keeping manufacturing tolerances manageable. Optional shielding or backflow elements reduce stray magnetic fields on the underside and simultaneously increase the worktop's rigidity, thus improving its flatness. Overall, the worktop combines the appearance of a standard work surface with an invisibly integrated holding function that remains effective while driving.

[0092] It is understood by those skilled in the art that, insofar as the invention relates to a motorhome with a table and the characterizing features described above, it also proposes a tabletop which has the aforementioned features, in particular a tabletop which is an integral part of a table arranged in a motorhome, characterized in that the tabletop has at least one magnetic element arranged in a receiving space of the tabletop, whereby an adhesion zone is formed in the tabletop which is configured to establish a direct magnetic coupling with a magnetically effective object, in particular a kitchen utensil and / or a piece of tableware, through a top layer of the tabletop.

[0093] Further advantages and features of the invention will become apparent from the following description with reference to the figures. These show Fig. 1 A motorhome according to the invention; Fig. 2 A kitchen unit of a motorhome according to the invention; Fig. 3 A kitchen worktop according to the invention in a first embodiment; Fig. 4 A kitchen worktop according to the invention in a second embodiment; and Fig. 5 A kitchen worktop according to the invention in a third embodiment.

[0094] The Fig. Figure 1 shows an embodiment of a residential vehicle 1 according to the invention, which here is designed as a motorhome. The residential vehicle 1 has a vehicle body 2 and a living area 3 arranged in the rear part of the vehicle body 2, which includes seating and a kitchen unit 4. The kitchen unit 4 is a fitted kitchen.

[0095] The kitchen furniture 4 is in Fig. Figure 2 shows in detail. It has a sink 5 and a cooktop 6. Both are surrounded by a kitchen worktop 7, which essentially provides the working area of ​​the kitchen unit 4. A contact zone 10 is formed in an area of ​​the kitchen worktop 7 between the sink 5 and the cooktop 6. The contact zone 10 serves to create a magnetic coupling between the kitchen worktop 7 and an object 11 placed in the contact zone 10 (not shown here), such that the object 11 is held securely in place even during the accelerations typically occurring during travel. Around the contact zone 10, the kitchen worktop 7 has an edge zone 15 in which magnetic coupling is not possible or only weakened.

[0096] To generate the magnetic coupling, the kitchen worktop 7, as shown in the three embodiments of the Fig. Figures 3-5 show at least one magnetic element 9 arranged in a receiving space 8 of the kitchen worktop 7. In the embodiments shown here, the kitchen worktop 7 has a plurality of magnetic elements 9 arranged in the receiving space.

[0097] These magnetic elements 9 generate a magnetic field with a magnetic field component perpendicular to a surface 13 of the kitchen worktop 7. This perpendicular magnetic field component creates a magnetic coupling with a magnetizable part of a utility object 11 that rests on the surface 13, specifically in the adhesion zone 10. This results in a force component pointing towards the magnetic elements 9, thus increasing the frictional force between the utility object 11 and the surface 13. This makes it more difficult for the utility object 11 to slip.

[0098] The kitchen worktop 7 also has a top layer 12, which in turn forms the surface 13, of which the adhesion zone 10 is a part. Around the adhesion zone 10, the edge area 15 is formed as a further part of the surface 13.

[0099] In the Fig. In the embodiment shown in Figure 4, the kitchen worktop 7 also has a shielding layer 16 which shields the magnetic field downwards and pushes it upwards, so that an increased holding effect is achieved and the area under the kitchen worktop 7 is shielded from the magnetic field.

[0100] The magnetic elements 9 are arranged in an internal pole pattern with alternating polarity (checkerboard arrangement), such that the four orthogonally adjacent magnetic elements 9 in the grid have opposite magnetization directions. In particular, in conjunction with the soft magnetic shielding layer 16 on the underside and a pole pitch in the range of 5 to 30 mm, an increased and largely uniform normal component of the flux density results in the adhesion zone 10. Reference sign 1 motorhome 2 Vehicle body 3 Living area 4 kitchen furniture 5 sinks 6 cooking stations 7 Kitchen worktop 8 Recording room 9 magnetic element 10 Liability Zone 11. Item of use 12 Top layer 13 Surface (of the kitchen worktop) 14 Edge (of the kitchen worktop) 15 Edge zone 16 Shielding layer QUOTES INCLUDED IN THE DESCRIPTION

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

[0000] DE 20 2010 004 867 U1

[0006]

Claims

[1] Residential vehicle (1), in particular caravan, motorhome or the like, comprising a vehicle body (2) and a living area (3), wherein a kitchen unit (4) is arranged in the living area (3) and is permanently connected to the vehicle body (2), wherein the kitchen unit (4) comprises in particular a sink (5) with water supply and a hob (6), wherein the kitchen unit (4) comprises at least one kitchen worktop (7) which is an integral part of the kitchen unit (4), characterized by , that the kitchen worktop (7) has at least one magnetic element (9) arranged in a receiving space (8) of the kitchen worktop (7), whereby an adhesion zone (10) is formed in the kitchen worktop (7) which is designed to enter into a direct magnetic coupling with a magnetically effective user object (11), in particular a kitchen utensil and / or a dish part, through a cover layer (12) of the kitchen worktop (7). [2] Motorhome according to claim 1, characterized by , that the kitchen worktop (7) has a closed, flat top layer (12) which has a flatness of less than 2 mm over a measuring length of 600 mm. [3] Motorhome according to one of claims 1 or 2, characterized by that the adhesion zone (10) extends over at least 60%, preferably at least 75%, further preferably at least 85% of an upwardly facing surface (13) of the kitchen worktop (7). [4] Motorhome according to claim 3, characterized by , that an edge zone (15) is formed on the circumferential edge (14) of the kitchen worktop (7), into which the adhesion zone (10) does not extend, wherein the edge zone preferably has a width of at least 30 mm, more preferably at least 50 mm, more preferably at least 75 mm, more preferably at least 100 mm. [5] Motorhome according to any of the preceding claims, characterized by, that in the adhesion zone (10) at a measuring height of 1 mm above the upwardly facing surface (13) the normal component of the magnetic flux density on a measuring grid with a point spacing ≤ 10 mm at each measuring point is at least 80 mT, preferably at least 160 mT, further preferably at least 250 mT and the relative inhomogeneity is ≤ 0.

20. [6] Motorhome according to any of the preceding claims, characterized by , that below the at least one magnetic element (9) a soft magnetic shielding layer (16) with an effective relative permeability ≥ 100 and a thickness ≥ 0.5 mm is arranged, and / or lateral soft magnetic shielding elements are arranged along at least a part of the edge (14) of the kitchen worktop (7). [7] Motorhome according to any of the preceding claims, characterized by, that the kitchen worktop (7) exhibits a flatness deviation ≤ 3 mm per 600 mm measuring length after a two-stage climate change test in which the kitchen worktop (7) is first exposed to an ambient temperature of 40 °C and a relative humidity of 85% for 24 hours and subsequently to an ambient temperature of 23 °C and a relative humidity of 50% for 24 hours. [8] Motorhome according to any of the preceding claims, characterized by , that the kitchen worktop (7) has several magnetic elements (9) in its receiving space (8) which are designed as an internal pole pattern with alternating polarity, wherein the pole spacing is in the range of 5-30 mm and is preferably designed as a striped, checkerboard or concentric ring pattern. [9] Motorhome according to claim 8, characterized by, that the magnetic elements (9) are designed as a Halbach array, wherein the magnetization direction of adjacent segments is preferably rotated by 90° ± 15° relative to each other. [10] Motorhome according to any one of the preceding claims, characterized by , that an adjustable soft magnetic shunt element is arranged in the kitchen worktop (7), which is adjustable between a first position with increased holding effect and a second position with reduced holding effect, wherein preferably the magnetic flux density at a measuring height of 1 mm above the upwardly facing surface of the kitchen worktop (7) is at least 30% higher in the first position than in the second position. [11] Motorhome according to any of the preceding claims, characterized by , that the top layer (12) consists of wood, plastic, mineral material or glass. [12] Motorhome according to any of the preceding claims, characterized by, that the magnetic flux density generated by the at least one magnetic element (9) at the kitchen worktop (7) at a measuring height of 1 mm above the top layer (12) is dimensioned such that a cylindrical reference test specimen with a mass of 3.0 kg and a plane-parallel, magnetizable base segment arranged on its underside with an effective coupling area of ​​50 cm² 2 and is held against slippage by a coefficient of friction µ_ref ≥ 0.30 against the top layer (12) at an acceleration ≤ 0.5 g. [13] Kitchen worktop (7) which is an integral part of a kitchen unit (4) arranged in a motorhome (1), characterized by, that the kitchen worktop (7) has at least one magnetic element (9) arranged in a receiving space (8) of the kitchen worktop (7), whereby an adhesion zone (10) is formed in the kitchen worktop (7) which is designed to enter into a direct magnetic coupling with a magnetically effective user object (11), in particular a kitchen utensil and / or a dish part, through a cover layer (12) of the kitchen worktop (7). [14] Residential vehicle (1), in particular caravan, motorhome or the like, comprising a vehicle body (2) and a living area (3), wherein a table is arranged in the living area (3) which is fixedly connected to the vehicle body (2), wherein the table has at least one tabletop which is an integral part of the table, characterized bythat the tabletop has at least one magnetic element arranged in a receiving space of the tabletop, whereby an adhesion zone is formed in the tabletop which is designed to enter into a direct magnetic coupling with a magnetically effective user object, in particular a kitchen utensil and / or a dish, through a top layer of the tabletop.

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