DE202017103083U1 - Sandwich plate for rail vehicles - Google Patents
Sandwich plate for rail vehicles Download PDFInfo
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- DE202017103083U1 DE202017103083U1 DE202017103083.0U DE202017103083U DE202017103083U1 DE 202017103083 U1 DE202017103083 U1 DE 202017103083U1 DE 202017103083 U DE202017103083 U DE 202017103083U DE 202017103083 U1 DE202017103083 U1 DE 202017103083U1
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- sandwich plate
- core element
- mineral fiber
- liquid substance
- predetermined
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61D—BODY DETAILS OR KINDS OF RAILWAY VEHICLES
- B61D17/00—Construction details of vehicle bodies
- B61D17/04—Construction details of vehicle bodies with bodies of metal; with composite, e.g. metal and wood body structures
- B61D17/18—Internal lining, e.g. insulating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B19/00—Layered products comprising a layer of natural mineral fibres or particles, e.g. asbestos, mica
- B32B19/02—Layered products comprising a layer of natural mineral fibres or particles, e.g. asbestos, mica the layer of fibres or particles being impregnated or embedded in a plastic substance
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B19/00—Layered products comprising a layer of natural mineral fibres or particles, e.g. asbestos, mica
- B32B19/04—Layered products comprising a layer of natural mineral fibres or particles, e.g. asbestos, mica next to another layer of the same or of a different material
- B32B19/041—Layered products comprising a layer of natural mineral fibres or particles, e.g. asbestos, mica next to another layer of the same or of a different material of metal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B19/00—Layered products comprising a layer of natural mineral fibres or particles, e.g. asbestos, mica
- B32B19/04—Layered products comprising a layer of natural mineral fibres or particles, e.g. asbestos, mica next to another layer of the same or of a different material
- B32B19/047—Layered products comprising a layer of natural mineral fibres or particles, e.g. asbestos, mica next to another layer of the same or of a different material of foam
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B19/00—Layered products comprising a layer of natural mineral fibres or particles, e.g. asbestos, mica
- B32B19/06—Layered products comprising a layer of natural mineral fibres or particles, e.g. asbestos, mica next to a fibrous or filamentary layer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
- B32B3/10—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material
- B32B3/12—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material characterised by a layer of regularly- arranged cells, e.g. a honeycomb structure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
- B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/02—Physical, chemical or physicochemical properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2250/00—Layers arrangement
- B32B2250/03—3 layers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2250/00—Layers arrangement
- B32B2250/40—Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
- B32B2260/02—Composition of the impregnated, bonded or embedded layer
- B32B2260/021—Fibrous or filamentary layer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
- B32B2260/04—Impregnation, embedding, or binder material
- B32B2260/046—Synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2266/00—Composition of foam
- B32B2266/02—Organic
- B32B2266/0214—Materials belonging to B32B27/00
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/10—Properties of the layers or laminate having particular acoustical properties
- B32B2307/102—Insulating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
- B32B2307/302—Conductive
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/72—Density
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2607/00—Walls, panels
Abstract
Sandwich-Platte (100) mit einem Kernelement (110) mit einer Frontfläche (111) und einer Rückfläche (112) sowie jeweils einem die Frontfläche (111) und einem die Rückfläche (112) abdeckenden Verschalungselement (120, 130) als miteinander verbundenen Schichtelementen (110, 120, 130), dadurch gekennzeichnet, dass mindestens eines der Schichtelemente (110, 120, 130) eine Mineralfaser enthält, die zusammen mit einer aushärtbaren flüssigen Substanz in eine vorherbestimmte feste Form gebracht ist.Sandwich panel (100) having a core element (110) with a front surface (111) and a rear surface (112) and one each the front surface (111) and a shuttering element (120, 130) covering the rear surface (112) as interconnected layer elements (110, 120, 130), characterized in that at least one of the layer elements (110, 120, 130) contains a mineral fiber, which is brought together with a curable liquid substance in a predetermined solid form.
Description
Die Erfindung betrifft eine Sandwich-Platte mit einem Kernelement mit einer Front- und einer Rückfläche sowie jeweils einem die Frontfläche und einem die Rückfläche abdeckenden Verschalungselement als miteinander verbundenen Schichtelementen. The invention relates to a sandwich panel having a core element with a front and a rear surface and in each case one the front surface and a rear surface covering shuttering element as interconnected layer elements.
Sandwich-Platten der eingangs genannten Art werden im Stand der Technik insbesondere zur Innenverkleidung von Schienenfahrzeugen verwendet. Alle für die Innenverkleidung von Schienenfahrzeugen zugelassenen Sandwich-Platten müssen unterschiedlichen gesetzlichen Vorgaben betreffend Festigkeit, Brandsicherheit und Oberflächenbeständigkeit genügen. Die bekannten Sandwich-Platten weisen indes unter anderem den Nachteil auf, dass sie für viele Anwendungsfälle entweder ein zu hohes Gewicht aufweisen und/oder eine zu hohe Wärmeleitfähigkeit und/oder eine zu geringe Schallabsorptionsfähigkeit aufweisen. Sandwich panels of the type mentioned above are used in the prior art, in particular for the interior lining of rail vehicles. All sandwich panels approved for the interior lining of rail vehicles must comply with various legal requirements regarding strength, fire safety and surface resistance. The known sandwich panels, however, have, inter alia, the disadvantage that, for many applications, they either have too high a weight and / or have too high a thermal conductivity and / or too low a sound absorption capacity.
Aufgabe der Erfindung ist es deshalb, eine Sandwich-Platte zu schaffen, deren Gewicht, Wärmeleitfähigkeit und Schallabsorptionsfähigkeit flexibel gestaltbar ist. The object of the invention is therefore to provide a sandwich panel whose weight, thermal conductivity and sound absorption capacity can be flexibly designed.
Für eine Sandwich-Platte der eingangs genannten Art wird diese Aufgabe erfindungsgemäß dadurch gelöst, dass mindestens eines der Schichtelemente eine Mineralfaser enthält, die zusammen mit einer aushärtbaren flüssigen Substanz in eine vorherbestimmte feste Form gebracht ist. For a sandwich panel of the type mentioned above, this object is achieved in that at least one of the layer elements contains a mineral fiber, which is brought together with a curable liquid substance in a predetermined solid form.
Bevorzugte Ausführungsformen der Erfindung sind Gegenstand der Unteransprüche der jeweiligen unabhängigen Patentansprüche, deren Elemente im Sinne einer weiteren Verbesserung des Lösungsansatzes der der Erfindung zugrunde gelegten Aufgabe wirken. Preferred embodiments of the invention are the subject of the dependent claims of the respective independent claims, the elements of which act in the sense of a further improvement of the approach of the invention underlying the object.
Bei der erfindungsgemäßen Sandwich-Platte wird mit Hilfe der Merkmalskombination, dass mindestens eines der Schichtelemente eine Mineralfaser enthält, die zusammen mit einer aushärtbaren flüssigen Substanz in eine vorherbestimmte feste Form gebracht ist, eine im Stand der Technik unerreichte Flexibilität betreffend die Parameter Gewicht, Wärmeleitfähigkeit und Schallabsorptionsfähigkeit ermöglicht. In the sandwich panel according to the invention is using the combination of features that at least one of the layer elements contains a mineral fiber, which is brought together with a curable liquid substance in a predetermined solid form, an unmatched in the art flexibility regarding the parameters weight, thermal conductivity and Sound absorption capability allows.
Gemäß einer ersten bevorzugten Ausführungsform der erfindungsgemäßen Sandwich-Platte ist vorgesehen, dass die Mineralfaser aus Basalt hergestellt ist. According to a first preferred embodiment of the sandwich panel according to the invention it is provided that the mineral fiber is made of basalt.
Gemäß einer anderen bevorzugten Ausführungsform der erfindungsgemäßen Sandwich-Platte ist vorgesehen, dass das Kernelement eine aus Basalt hergestellte Mineralfaser enthält, die zusammen mit einer aushärtbaren flüssigen Substanz in eine vorherbestimmte feste Form gebracht ist. According to another preferred embodiment of the sandwich panel according to the invention it is provided that the core element contains a mineral fiber made of basalt, which is brought together with a curable liquid substance in a predetermined solid form.
Alternativ kann vorgesehen sein, dass mindestens eines der Verschalungselemente eine aus Basalt hergestellte Mineralfaser enthält, die in eine in vorherbestimmter Form ausgehärtete flüssige Substanz eingebracht ist. Alternatively it can be provided that at least one of the shuttering elements contains a mineral fiber made of basalt, which is introduced into a cured in predetermined form liquid substance.
In obigem Fall, dass das Kernelement keine aus Basalt hergestellte Mineralfaser enthält, kann das Kernelement vorzugsweise eine poröse Struktur aufweisen. So kann das Kernelement beispielsweise aus einem auf Basis eines Kunststoffmaterials erstellten Schaumstoff hergestellt sein, oder es kann eine metallische Wabenstruktur aufweisen. In the above case, that the core member does not contain basalt-made mineral fiber, the core member may preferably have a porous structure. For example, the core element can be made from a foam made from a plastic material, or it can have a metallic honeycomb structure.
Die Mineralfaser ist vorzugsweise aus Basalt hergestellt. The mineral fiber is preferably made of basalt.
Die im Zusammenhang mit der festen Formgebung eines Schichtelementes verwendete aushärtbare flüssige Substanz kann beispielsweise ein Harz oder ein Klebstoff sein. The curable liquid substance used in connection with the solid shaping of a layer element may be, for example, a resin or an adhesive.
Des Weiteren sind die Verschalungselemente vorzugsweise mittels eines Harzes oder eines Klebstoffes fest mit dem Kernelement verbunden. Furthermore, the shuttering elements are preferably firmly connected to the core element by means of a resin or an adhesive.
Gemäß einer weiteren bevorzugten Ausführungsform der erfindungsgemäßen Sandwich-Platte ist die Mineralfaser mittels eines aushärtbaren Aerogels, also einem mit Luft untermischten Harz oder Klebstoff in die vorherbestimmte Form gebracht. According to a further preferred embodiment of the sandwich panel according to the invention, the mineral fiber is brought into the predetermined shape by means of a curable airgel, that is, a resin or adhesive mixed with air.
Gemäß einer anderen bevorzugten Ausführungsform der erfindungsgemäßen Sandwich-Platte weist das Gemisch aus Mineralfaser und aushärtbarer flüssiger Substanz als Edukt durch Aufschäumung mittels eines Gases eine poröse Struktur auf. According to another preferred embodiment of the sandwich panel according to the invention, the mixture of mineral fiber and curable liquid substance as educt by foaming by means of a gas on a porous structure.
Ein Hohlraumvolumen der porösen Struktur ist dabei vorzugsweise gewählt, um dem ausgehärteten Produkt ein vorherbestimmtes Gewicht und/oder eine vorherbestimmte Wärmeleitfähigkeit und/oder eine vorherbestimmte Schallabsorptionsfähigkeit vorzugeben. A void volume of the porous structure is preferably selected in order to predetermine a predetermined weight and / or a predetermined thermal conductivity and / or a predetermined sound absorption capacity of the cured product.
Die Mineralfaser kann in einem Schichtelement beispielsweise in Form eines eine gerichtete Struktur aufweisenden Rowings, einer eine gerichtete Struktur aufweisenden Matte mit einer hohen Anzahl ungerichteter Mineralfasern, eines eine vorgegebene Struktur aufweisenden Gewebes oder in Form einer strukturlosen Schnitzelanhäufung angeordnet sein. The mineral fiber can be arranged in a layer element, for example in the form of a directed structure of a roving, of a directional structure having a high number of undirected mineral fibers, of a fabric having a predetermined structure or in the form of a structureless chip accumulation.
Gemäß einer wichtigen bevorzugten Ausführungsform der erfindungsgemäßen Sandwich-Platte enthalten sowohl das Kernelement als auch die Verschalungselemente eine aus Basalt hergestellte Mineralfaser, die zusammen mit einer aushärtbaren flüssigen Substanz in eine vorherbestimmte feste Form gebracht ist. Indes kann auch in diesem Fall das Kernelement gegenüber den Verschalungselementen eine unterschiedliche Dichte aufweisen. According to an important preferred embodiment of the sandwich panel according to the invention, both the core element and the shuttering elements comprise a mineral fiber made of basalt which is brought into a predetermined solid form together with a curable liquid substance. However, in this case too, the core element can have a different density than the shuttering elements.
Gemäß einer Standardausführung sind die Mineralfasern des Kernelementes sowie der Verschalungselemente mittels der aushärtbaren flüssigen Substanz zu einem rechteckigen Paneel geformt. According to a standard embodiment, the mineral fibers of the core element and the shuttering elements are formed by means of the curable liquid substance into a rectangular panel.
Indes können das Kernelement sowie die Verschalungselemente zum Zweck einer verbesserten Haftung im Wege einer Oberflächenvergrößerung im Bereich ihrer aneinander angrenzenden Flächen eine konkav/konvex gebogene Formgebung aufweisen. However, the core element as well as the shuttering elements can have a concave / convexly curved shape for the purpose of improved adhesion by means of an increase in surface area in the region of their adjoining surfaces.
Darüber hinaus können das Kernelement sowie die Verschalungselemente mittels der aushärtbaren flüssigen Substanz in eine vorherbestimmte 3-dimensionale Form gebracht sein. In addition, the core element and the shuttering elements can be brought into a predetermined 3-dimensional shape by means of the curable liquid substance.
Zum Zweck eines Heizens oder eines Kühlens der erfindungsgemäßen Vorrichtung können zwischen einer Oberfläche des Kernelementes (Frontfläche oder Rückfläche) und einer angrenzenden Fläche eines Verschalungselementes mäanderförmig verlegte Leitungen angeordnet sein. Eine entsprechende Leitung kann dabei als Rohrleitung zum Durchfluss eines Kühl- oder Heizmediums oder als elektrischer Widerstandsdraht mit der Wirkung eines Heizmediums ausgelegt sein. For the purpose of heating or cooling the device according to the invention meandering lines can be arranged between a surface of the core element (front surface or rear surface) and an adjacent surface of a shuttering element. A corresponding line can be designed as a pipe to flow through a cooling or heating medium or as an electrical resistance wire with the effect of a heating medium.
Die erfindungsgemäße Sandwich-Platte wird im Folgenden anhand einer bevorzugten Ausführungsform erläutert, die in den Figuren der Zeichnung dargestellt ist. Darin zeigt: The sandwich panel according to the invention will be explained below with reference to a preferred embodiment, which is shown in the figures of the drawing. It shows:
Die in der
Das Kernelement
Das Hohlraumvolumen der porösen Struktur des Kernelementes
Die aushärtbare flüssige Substanz ist von einem Harz gebildet, und die Verschalungselemente
Die Mineralfaser der Verschalungselemente
Die Mineralfaser in den Verschalungselementen
Das oben erläuterte Ausführungsbeispiel der Erfindung dient lediglich dem Zweck eines besseren Verständnisses der durch die Ansprüche vorgegebenen erfindungsgemäßen Lehre, die als solche durch das Ausführungsbeispiel nicht eingeschränkt ist. The above-described embodiment of the invention is only for the purpose of better understanding of the teaching of the invention predetermined by the teaching, which is not limited as such by the embodiment.
BezugszeichenlisteLIST OF REFERENCE NUMBERS
- 100100
- Sandwich-Platte Sandwich panel
- 110110
- Kernelement core element
- 111111
- Frontfläche front surface
- 112112
- Rückfläche rear surface
- 110, 120, 130110, 120, 130
- Schichtelemente layer elements
- 120, 130120, 130
- Verschalungselemente formwork elements
Claims (26)
Priority Applications (1)
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DE202017103083.0U DE202017103083U1 (en) | 2017-05-22 | 2017-05-22 | Sandwich plate for rail vehicles |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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DE202017103083.0U DE202017103083U1 (en) | 2017-05-22 | 2017-05-22 | Sandwich plate for rail vehicles |
Publications (1)
Publication Number | Publication Date |
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DE202017103083U1 true DE202017103083U1 (en) | 2017-08-03 |
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DE202017103083.0U Active DE202017103083U1 (en) | 2017-05-22 | 2017-05-22 | Sandwich plate for rail vehicles |
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