EP1881124B1 - Lightweight construction board - Google Patents

Description

The invention relates to a lightweight board according to the preamble of claim 1.

FIGS. 128 and 129 in FIG EP1321593A2 disclose a lightweight panel according to the preamble of the claim

There is a plate for flaps, doors or walls for furniture known ( DE 299 24 446 U1 ), which consists of a base plate and at least one cover plate. The base plate is provided on its upper side with longitudinal grooves. It can also be two base plates rotated by 180 ° placed on each other and glued together.

It is further known a blockboard ( DE 1 619 878 U ), which consists of rods, which are longitudinally divided by sinusoid or zig-zag and stapled so that the culmination points of the curved sections touch the straight longitudinal sides of the neighboring rods.

There is a blockboard known (CH 222 317), are introduced into the slots, which are provided in rows next to each other.

From CH 310 904 a Tischlerplatte is known, which consists of a central layer with a rod grid and spacers, which are arranged to form hollow cells in the Tischlerplatte with distance from each other.

The DE 809 104 shows a blockboard with blind strips, which are arranged at a distance from each other and have a double trapezoidal cross section. The two trapezoids lie on each other with their narrow sides.

For sound insulation or acoustic panels, panels are known ( DE 10 2004 061 138 A1 ), which consist of two superposed and glued together layers. Slots or savings are made in the tops of the panels.

Furthermore, wooden beams with longitudinal-axis holes are known ( DE 299 07 425 U1 and DE 299 09 733 U1 ).

Finally, a wooden building board is known ( DE 297 24 732 U1 ), in which on a base plate wooden parts are layered, which are at a distance from each other and form between them cavities or spaces.
There are further known blocks of glued wooden boards and the like, which have internal cavities and caused by the gluing of several parts in box-like or sandwich-type.

All of these previously used plates are composed of several layers to allow in the middle position or in the glued planes profilings and recesses in order to save weight.

There are also known solid wood panels, which are formed of solid slats same or different width, which are flat with their long sides together and are glued together.

There are also solid wood panels known, consisting of continuous slats of the same or unequal width and thickness, which are glued together on their long sides. It is also known to produce slabs of lamellae, which are connected to each other from several parts in the longitudinal direction, preferably by finger jointing.

Such solid wood panels usually have a very high weight, due to the high density of the wood, which is undesirable for many applications. For pick-up furniture or DIY panels sold in construction and specialty stores, the weight is of great importance, especially with regard to the logistics of the goods by correspondingly high transport costs or only small amounts of transport, for example, in truck transport.

When using plate-like materials for furniture, flaps, doors, walls and other components in the range of boats, ship, motorhome, caravan, Waggonbau- and vehicle equipment and the use of mobile buildings, such as exhibition components, stages, residential containers and the like , if possible, low weight panels should be used to facilitate handling.

The invention has the object of providing the generic lightweight board in such a way that it has a low weight with structurally simple design and has a high strength.

This object is achieved in the generic lightweight board according to the invention with the characterizing features of claim 1.

In the lightweight panel according to the invention, the recesses extend over only a portion of the length and width of the slats and go at least at one end in the longitudinal direction in the voltage applied to the adjacent slat longitudinal side surface of the slat. As a result, the slats and thus the lightweight panel formed from them have a high strength and low weight. The depressions can be provided at the appropriate areas of the slats, so that the lightweight panel can be optimally adapted to their desired application by placing the wells at the desired location. When gluing the slats, the slimmer, interrupted gluing surfaces result in a significantly lower glue requirement and only correspondingly low costs. Due to the cavities formed by the recesses, lightweight panel according to the invention can also be used for soundboards of musical instruments, for tonewoods, speakers and the like with improved vibration behavior, since the modulus of elasticity of the lightweight panel is increased compared to solid plates and thus special, especially excellent Sound effects can be achieved.

In the usual way of gluing the slats with heating presses for curing of the glue only small pressing times are necessary because the amount of material to be heated is low, which also energy costs can be saved.

The resulting in the production of the wells chips have a high material value as a raw material, for example, for the chipboard industry. The chips can also be pelleted or briquetted and then used as fuel. This advantageous further use of the chips more than offset the increased production costs in the production of the slats and the lightweight panel produced therefrom.

The lightweight board according to the invention can be used anywhere where low weight with high strength are required. The lightweight panel according to the invention is therefore used for example in driving furniture, DIY panels and the like. For the shop and display production lightweight panels of the invention are due to the ease of transport and manipulation advantage.

For use as a packaging material for air transport or transport, where it depends on a low package weight with high stability, the lightweight panel according to the invention is outstandingly suitable.

In the food industry, the lightweight board according to the invention can be used for example for the transport or storage of baked goods or for the production of cheese. Cheese is stored on boards for ripening and often has to be manually transported to produce the product. The lightweight panel according to the invention is due to their low weight and high strength ideal for this purpose. These properties of the lightweight board according to the invention are also when used in scaffold planks, formwork beams, formwork panels, shuttering panels and the like of advantage.

If the lightweight panel according to the invention used in furniture, the corresponding furniture can be easily transported, for example, in a move due to the low weight. In comparison with furniture made of solid panels, a weight saving of 30 to 50% can be achieved when using the lightweight panel according to the invention.

Due to the low weight can be realized with the lightweight panel of the invention thicker furniture elements, if this is desired, for example, for aesthetic reasons. Such thicker furniture parts may be, for example, the body, a cover plate, furniture cheeks, table tops and the like. Also, large furniture elements, for example, large cabinet doors, easy to handle when using the lightweight panel according to the invention and allow smaller fittings. Under certain circumstances, even bands can be saved.

Due to the low weight, a less expensive edge and corner protection can be used for the transport, whereby the packaging costs are reduced. Also, weight-related damage during transport are significantly reduced due to the low plate weight.

The lightweight board according to the invention can be used, for example, as a core board center layer or as a composite material for interior doors.

The recesses in the side surfaces of the slats can be designed so that they can be used as a distinguishing feature for the production of lightweight panels.

If the depressions are provided only on one longitudinal side surface of the lamella, the corresponding processing machine can be designed simply, since the corresponding milling tool of the machine works only on one lamella side. In addition, this also the chip removal is simplified.

If thick lightweight panels are to be used, it is advantageous if the lamellae have additional gluing profiles on the longitudinal sides to be glued. Thick lightweight panels are used for example as construction elements, for example, for walls, stairs, countertops, solid wood walls, scaffold boards and the like. In order for the lightweight board to have the appearance of a solid slab, a closed edge slat is advantageously provided at its edges, which conceals the depression of the adjacent end slat. The edge lamellae are advantageously formed without depressions, so that they are due to their solid design ideal for fastening fittings and the like.

The lightweight board can be provided with circumferential, lateral or front side anchors to produce a closed shape of the lightweight board.

The cavities of the lightweight board can be filled with materials that result in an increase in fire resistance. Such lightweight panels can then be used for fire protection applications. The cavities can also be filled with such materials that the lightweight panels can be used as a protective plates for example safety.

Further, it is possible to fill the cavities with materials such as fibrous materials, insulation board strips and the like in order to increase the thermal insulation. Such lightweight panels can be used for thermal insulation applications or for acoustic panels.

The depressions in the longitudinal sides of the lightweight board may have groove-shaped recesses which are suitable for receiving plug-in connections, for example spring strips. Then two or more lightweight panels can be joined together. In this way, a larger flat contiguous plate can be made of individual lightweight panels that can be used, for example, for mounting on walls, floors, ceilings and the like.

The slats can also be provided with horizontal and vertical finger joints.

An advantageous embodiment of the lightweight board is achieved when the slats have square cross-section. This results in a very stable lightweight board, in which the cavities separating webs can be provided differently. Depending on the position of the webs, the lightweight board can be used as a central layer of woodworking panels, as a door center layer and the like. Advantageously, the lightweight board can be used as a long field plate or cassette of a suspended ceiling. Such a lightweight board has properties as achieved with other panel elements such as acoustic panels and three-layer panels.

The cavities in the lightweight panel can have different shapes. By suitable shape design, the lightweight board can receive a statically meaningful training to obtain a high strength. Due to the cavities, the lightweight board has a high modulus of elasticity.

Have the wells in the two longitudinal side surfaces of the slats different depth and shape, the stiffness, in particular the bending stiffness, the lightweight panel can be easily adapted to the desired application. In the case of wood as a lamellar material, the tensile strength is approximately twice as great as the compressive strength. This fact can be used to further reduce the weight of the lightweight panel, if the recesses are provided accordingly.

The webs separating the depressions of the slats may be arranged asymmetrically with respect to the width of the slats. As a result, the static properties, in particular the joint, the bending, the Querzug-, the pressure and the breaking strength are improved.

If the recesses are provided asymmetrically in the lamella with respect to the width or thickness of the lamellae, static improvements and thicker lightweight panels can be produced by layer-wise gluing of at least two lightweight panels, which have thicker material thicknesses in the outer layers.

If the recesses in the slats are provided so that they overlap one another, as seen in plan view of the lightweight board, a spring effect is achieved, which saves considerable weight when using the lightweight board as a central location for other lightweight panels in sandwich or acoustic panels.

The depressions from each other separating webs may be provided with openings, so that the recesses are connected to each other at the two longitudinal side surfaces of the lamella. Due to the breakthroughs, the weight of the slats and thus the lightweight panel is further reduced. Such a design is advantageous if the lightweight board is used for example for acoustic panels.

Further features of the invention will become apparent from the other claims, the description and the drawings.

The invention will be explained in more detail with reference to some embodiments shown in the drawings. The embodiments according to Figures 2 and 15-25 are not part of the invention.

Fig. 1

teilweise im Schnitt und in perspektivischer Darstellung eine erfindungsgemäße Leichtbauplatte,

Fig. 2

in Draufsicht eine Lamelle bekannt aus dem Stand der Technik,

Fig. 3 und Fig. 4

in Darstellungen entsprechend Fig. 2 weitere Ausführungsformen von Lamellen der erfindungsgemäßen Leichtbauplatte.

Fig. 5 bis Fig. 14

jeweils im Schnitt einen Teil von Ausführungsformen einer erfindungsgemäßen Leichtbauplatte,

Fig. 15 bis Fig. 18

jeweils in Draufsicht einen Teil von weiteren Ausführungsformen einer nicht-erfindunasaemäßen Leichtbauplatte.

Fig. 19 und Fig. 20

jeweils im Horizontalschnitt einen Teil von weiteren Ausführungsformen einer nichterfindungsgemäßen Leichtbauplatte,

Fig. 21

teilweise im Schnitt und in perspektivischer Darstellung eine weitere Ausführungsform einer nichterfindunasaemäßen Leichtbauplatte,

Fig. 22 bis Fig. 25

jeweils in Draufsicht einen Teil von weiteren Ausführungsformen einer nicht-erfindunasaemäßen Leichtbauplatte,

Fig. 26 und Fig. 27

jeweils teilweise im Schnitt und in perspektivischer Darstellung mehrere aufeinandergesetzte Leichtbauplatten,

Fig. 28 bis Fig. 32

jeweils im Schnitt einen Teil von weiteren Ausführungsformen der erfindungsgemäßen Leichtbauplatte,

Fig. 33 und Fig. 34

jeweils im Schnitt einen Teil von Ausführungsformen von Lamellen der erfindungsgemäßen Leichtbauplatte.

Fig.35

Figur in schematischer Darstellung des Verfahrens zum Einbringen von Vertiefungen in die erfindungsgemäße Leichtbauplatte

Show it

Fig. 1

partly in section and in perspective representation of a lightweight panel according to the invention,

Fig. 2

in plan view a blade known from the prior art,

FIG. 3 and FIG. 4

in representations accordingly Fig. 2 further embodiments of slats of the lightweight panel according to the invention.

FIG. 5 to FIG. 14

each in section a part of embodiments of a lightweight panel according to the invention,

FIGS. 15 to 18

each in plan view a part of further embodiments of a non-erfindunasaemäßen lightweight board.

FIGS. 19 and 20

each in horizontal section a part of further embodiments of a non-inventive lightweight board,

Fig. 21

partly in section and in perspective, another embodiment of a non-inventive lightweight building board,

FIGS. 22 to 25

each in plan view a part of further embodiments of a non-erfindunasaemäßen lightweight board,

FIGS. 26 and 27

each partially in section and in perspective, several stacked lightweight panels,

FIGS. 28 to 32

each in section a part of further embodiments of the lightweight board according to the invention,

FIGS. 33 and 34

in each case in section a part of embodiments of lamellae of the lightweight building board according to the invention.

Fig.35

Figure in a schematic representation of the method for introducing depressions in the lightweight building board according to the invention

In the described embodiments, like reference numerals are used for the same parts, wherein the disclosures contained in the description can be mutatis mutandis transferred to like parts with the same reference numerals. The position information selected in the description, such as top, bottom, side, etc., are related to the immediately described and illustrated illustration and are to be transferred to a new position in a change in position. It is also possible for individual features or combinations of features from the illustrated and described exemplary embodiments to represent independent, inventive or inventive solutions.

Fig. 1 shows a plate 1, which may consist of wood, wood materials, plastic and the like. The plate is designed as a lightweight board and in the embodiment has a substantially rectangular shape. The plate 1 consists of at least two elongate lamellae 3, which are connected to each other with their longitudinal side surfaces 6 together. In the embodiment, a large number of fins 3 is provided, which form the plate 1 adjacent to one another. In a rectangular design of the plate 1, the slats 3 are equal. The plate 1 can also have any other outline shape, wherein the length of the slats 3 is adjusted accordingly. The slats 3 advantageously also have a rectangular outline. In the illustrated embodiment, the adjacent slats 3 are connected to each other via an adhesive layer 8. The lamellae 3 have at their opposite longitudinal side surfaces 6 at least one extending in the longitudinal direction of the slats 3 recess 2. In the exemplary embodiment, the lamellae 3 have on each longitudinal side surface 6 two recesses 2 lying at a distance apart from each other. They are advantageously of identical design, but may also have different shapes. The depressions 2 can be produced very easily, for example, by milling. Between the recesses 2, a recess-free zone 7 forming a web remains, which advantageously extends between the two opposite longitudinal side surfaces of the lamella 3. Also at both ends of the blade 3 such well-free zones 7 may be provided. But it is also possible that the wells 2 at the two opposite Longitudinal side surfaces 6 are formed differently and / or offset in the longitudinal direction of the blade 3 to each other. Then, the recess-free zones extend over only a part of the width of the respective lamella 3.

Thus, the plate 1 has a closed edge at least on their opposite sides, can be used as covers edge slats 10, which are provided only on a longitudinal side surface with a recess 2. This edge lamella 10 is attached to the lamella 3 so that the closed longitudinal side surface of the edge lamella 10 forms the closed edge of the plate 1. In the illustrated embodiment, the two lying at right angles to the closed longitudinal sides 33 longitudinal sides 13 of the plate 1 are closed, because the recesses 2 in the blades 3, 10 terminate at a distance from these long sides.

The plate 1 can of course also be designed so that it is closed only at one or two or three edges.

The plate 1 has a thickness 12 which corresponds to the thickness of the slats 3, 10.

The wells 2 have in the embodiment, a rectangular profile design, the wells 2 are separated from each other at the two longitudinal side surfaces 6 of the blade 3 by a web 9. It is located in the embodiment in half the width of the slat 3. The web 9 has the width 11, which may be, for example, one third of the width of the slat 3.

The opposite longitudinal sides 13 of the plate 1 are formed by the end faces of the slats 3. Since the edge strips 10 are provided with the closed longitudinal side 33 on the other longitudinal sides, the plate 1 has a peripherally closed edge.

The recesses 2 of the adjacent lamellae 3 form cavities 34 in the plate 1. Since it is closed at the edge and the cavities 34th can not be seen, the plate 1 looks like a commercial solid plate.

In Fig. 1 is indicated by the dash-dotted lines 14 that the composite of the slats 3, 10 plate 1 in the well-free zones 7 and the webs 9 can be separated. Symbolically, a circular saw blade 35 is shown for this purpose. In this way, a large plate 1 can be divided into smaller plates. If the separating cut is made through the recess-free zones 7 and the webs 9, then the smaller plates also have a closed edge. However, such a procedure is only possible if the well-free zones 7 of all slats 3 are at the same height. The same applies to the web 9 extending in the longitudinal direction of the lamellae.

Fig. 2 shows by means of a lamella 3 known from the prior art possibility that the recesses 2 extend over the entire length of the lamella 3 on a longitudinal side surface. In this case, the slats have a continuous, that is not interrupted profile design 15. If the plate 1 composed of such slats 3 have a closed edge, a corresponding closed slat must be attached to the end faces of the slats 3.

Fig. 3 schematically shows a blade 3, which is formed in principle the same as the blade according to Fig. 1 , The recesses 2 are provided at the end with a curved surfaces forming input and Ausschauchkurve 20, which is produced by a milling tool with which the recess 2 are milled into the longitudinal side surfaces 6 of the blade 3. The arcuate ends of the recesses 2 form the side surfaces of the recess-free zone 7, which separates the adjacent recesses 2 of the lamella 3 from each other.

The entry and exit curve 20 can be made different in shape, depending on the material and material property. Thus, the curved end region can be circular, sinusoidal, parabolic or designed as a free-form curve.

Fig. 4 shows a lamella 3, which has not only two, but more depressions 2 on the longitudinal side surfaces 6 over its length. The recesses 2 on the two longitudinal side surfaces 6 are equal to each other, so that between them in each case the common, a web forming well-free zone 7 is. The wells 2 advantageously also have the input and Ausschauchkurve 20, based on Fig. 3 has been explained. The larger number of wells 2 and thus the greater number of well-free zones 7 is useful if along the plate 1 fasteners, such as dowels, screws, fittings and the like to be mounted. They can be securely mounted in the solid well-free zones 7. The multiplicity of connection-free zones 7 are also suitable if the lightweight panel 1 formed from the slats 3 is to be cut to size.

The basis of the Fig. 2 to 4 shown arrangement of wells 2 and well-free zones 7, as shown by Fig. 1 has been explained, depending on the application of the lightweight panel 1 vary.

According to the embodiment Fig. 5 are the slats 3 according to the embodiment according to Fig. 1 , formed mirror-symmetrically with respect to its longitudinal center plane. The recesses 2 in the contiguous longitudinal side surfaces 6 form the cavities 34 of the lightweight board 1. To achieve a closed edge termination of the plate 1, two edge blades 10 are provided which are without recesses and abut each other with their longitudinal side surfaces and interconnected. In the Fig. 5 right edge lamella 10 is attached to the longitudinal side 6 of the adjacent lamella 3. Since the edge of the lightweight panel 1 is formed by two adjoining edge slats 10, the plate 1 has a sufficiently wide solid edge to which fasteners and the like can attach reliably. Such edge formation may be provided on all edges of the plate 1.

The slats 3 according to Fig. 6 have asymmetrical cross-section. The depressions 2 on the one longitudinal side surface 6 of the lamella 3 have a smaller depth than the depression 2 on the opposite longitudinal side surface 6. Accordingly, the solid web 9 is off-center. The cavities 34 formed by the depressions 2 adjacent slats 3 are thus also off-center with respect to the abutting longitudinal side surfaces 6 of the slats 3. So that the plate 1 formed from the slats 3 has a continuous edge termination, a lipping 16 is used, which on a longitudinal side surface 42 has a centrally located projecting web 36. With him the edge band 16 is inserted into the recess 2 of the adjacent blade 3 and held in a suitable manner. The web 36 may be glued in the recess 2 of the blade 3, but also be held by press fit. Advantageously, the web 36 is pressed into the recess 2 of the blade 3 and glued. The web 36 and the recess 2 are formed so that the edge band 16 rests flat with its longitudinal side surface 42 on the longitudinal side surface 6 of the lamella 3. The edge band 16, like the edge lamella 10, has the same thickness as the lamella 3.

In the illustrated embodiment, the edge band 16 extends to the longitudinal side surface 6 of the blade 3. It is also possible, the edge band 16 at the end faces 13 (FIG. Fig. 1 ) of the slats 3 provide. In this case, a corresponding depression is introduced into the end face 13 of the slats 3, in which the edge band 16 projects with the web 36. Thus, it is possible to provide the lightweight panel 1 at all edges with the edge 16.

The web 36 is provided only at the locations where the depressions 2 in the adjacent lamella 3 are located. But it is also possible that the lamella 3, to which the edge band 16 is to be fastened, has a recess 2 extending over its length. In this case, the edge band 16 also has a web 36 which extends through its longitudinal side 40.

The edge band 16 can have the same width as the solid edge lamella 10. The edge band 16 can accordingly fastening parts and the like are easily and yet securely attached.

The achieved by the different depths asymmetric arrangement of the wells 2 in the longitudinal side surfaces 6 of the slats 3 has the advantage that when milling the wells 2 in a processing machine from above and below an improved chip removal is possible.

Fig. 7 shows the possibility to connect two plates 1 composed of lamellae 3 by means of at least one spring 17. The fins 3 of the two plates 1 are formed symmetrically with respect to the longitudinal center plane, but can of course also according to the embodiment according to Fig. 6 have asymmetrical cross-section. The spring 17 is adapted to the cross-sectional shape of the recesses 2 in the edge-side fins 3 of the two lightweight panels 1. The spring 17 can be pressed into the recesses 2 and / or glued on one or both sides, depending on the application and purpose of the composite lightweight panels 1. Have the end-side fins 3 of the two lightweight panels 1 more wells 2 on its longitudinal side surface 6, then a corresponding number used by springs 17 to connect the two lightweight panels 1 together. But it is also possible that the end-side fins 3 have continuous recesses 2 over their length. In this case, a spring 17 is sufficient, which advantageously extends over the entire length of the recesses 2.

As it turned out Fig. 8 results, the slats 3 can be provided on their longitudinal side surfaces 6 with profilings 18, 18 ', which are formed on one longitudinal side surface 6 of the slats 3 by projecting webs 18 and on the other longitudinal side surface by corresponding recesses 18'. The adjacent lamellae 3 are then connected via the webs 18 and the recesses 18 'positively to one another. In the exemplary embodiment, the webs 18 have a trapezoidal cross section and taper in the direction of their free end. Accordingly, the recesses 18 'have trapezoidal cross-section. The webs 18 and thus the depressions 18 'can of course also have any other suitable cross-sectional shape. By the webs 18 and the recesses 18 ', the adhesive surface is increased, so that a better adhesive connection of the adjacent lamellae 3 is achieved. Such a design of the slats 3 is particularly advantageous when using difficult to glue materials and particularly large plate thicknesses 12. The maximum width of the webs 18 is smaller than the thickness of the longitudinal side surface 6 in the region of the depressions 2.

Fig. 9 shows an embodiment in which the lamellae 3 are provided only on a longitudinal side surface 6 with recesses 19. On the opposite longitudinal side surface 6 no depressions are present. The recesses 19 have a greater depth than the recesses 2 of the previous embodiments. Advantageously, the depth of the recesses 19 is greater than half the width of the slats 3. The wells 19 are like the wells 2 in half the thickness of the slats 3. As a result, the depressions 2 delimiting sections of the slats 3 have the same thickness. Since the lamellae 3 are closed on one longitudinal side, an edge lamella 10 is necessary only on the other longitudinal side of the end lamella 3 if the lightweight panel 1 is to have a closed edge. Instead of the edge blade 10 and the blade 3 can be used, which can be rotated by 180 ° attached to the adjacent blade 3 and connected to it. Then, the continuous longitudinal side surface 6 of this lamella 3 forms the edge termination of the plate 1. It is also possible to use a lamella in place of the edge lamella 10, which has at least one relatively shallow depression. Then this lamella can be attached to the lamella 3, that the closed longitudinal side forms the edge termination of the plate 1.

The fins 3 of this embodiment may be formed according to the previous embodiments.

The embodiment according to Fig. 10 differs from the embodiment according to Fig. 9 only by the other cross-sectional configuration of the recess 19. While the recess 19 in the embodiment according to Fig. 9 rectangular shape has the recess 19 according to Fig. 10 from its bottom 37 of increasing cross-section. Advantageously, the cross section from the bottom 37 increases steadily. The side walls 38, 39 of the recess 19 may be at any angle to each other. The cross-sectional configuration of the recess 19 can also be asymmetrical. The side walls 38, 39 do not have to be flat, but can also have any other suitable course, which will be explained in more detail with reference to the following figures. The plate 1 may be provided with at least one edge lamella 10 to obtain a closed edge termination. In the exemplary embodiment, the edge lamella 10 is fastened to the closed longitudinal side surface 6 of the adjacent lamella 3. In the same way can be provided on the opposite edge of the plate 1, such an edge plate. Basically, it is possible on the in Fig. 10 shown edge plate 10 to dispense, since the longitudinal side surface of the end-side blade 3 is already formed continuously closed. However, the attachment of the additional edge lamella 10 has the advantage that sufficient material is available for fastening parts and the like.

The slats 3 according to Fig. 11 are mirror-symmetrical with respect to their longitudinal center plane. The side walls 38, 39 of the recesses 2 are stepped. The opening into the longitudinal side surface 6 of the slats 3 section of the recesses 2 has a larger cross-section than the inner part. Both parts of the recesses 2 merge into one another via a step 22. It runs in the embodiment perpendicular to the straight side walls 38, 39 of the recess 2. The stage can also be at an angle to the side walls. In the illustrated embodiment, the two sections of the recess 2 have the same depth. But it is also possible that these two different width sections of the recess 2 have different depths. The recesses 2 of the adjoining slats 3 in turn form the cavities 34 of the lightweight board 1. The slats 3 are provided on both longitudinal side surfaces 6 with the wells 2.

Fig. 12 shows lamellae 3, in which the recesses 2 on the two longitudinal side surfaces 6 each have a conical cross section. The side walls 38, 39 of the recesses 2 are flat and are at an angle α to the longitudinal center plane of the recess 2. The angle α can be selected depending on the purpose and / or type of material so that the adjacent slats 3 can be reliably fixed together , The depressions 2 may deviate from the illustrated embodiment also have an asymmetrical cross-section, that is, the side wall 38 may be inclined α at an angle α to the longitudinal center plane of the recess as the opposite side wall 39th

Fig. 13 shows the possibility that the side walls 38, 39 of the recesses 2 are curved. The recesses 2 are in turn formed symmetrically with respect to their longitudinal center plane. The two side walls 38, 39 have the same curvature 23. The side walls can also have any other suitable curvature. The cross-section of the recesses 2 increases in the direction of the longitudinal side surface 6 of the slats 3.

Fig. 14 shows the possibility that the recesses 2 are not provided centrally in the longitudinal side surfaces 6 of the slats 3. As a result, the recesses 2 delimiting edges 40, 41 of the slats 3 have different thickness. As a result, the lightweight board 1, depending on the installation position on a different flexural strength. Due to this asymmetric design of the recesses 2 to the plate level, the weight for a static load can be further reduced when using the lightweight panel 1. The tensile strength is almost twice as great as the compressive strength. The depressions 2 can have very different cross-sectional shapes. Due to the different bending strengths, the lightweight board 1 can be advantageously used as an acoustic panel.

Fig. 15 shows a lightweight panel in which the adjacent slats 3 are provided on both longitudinal side surfaces 6 with the wells 2. They are provided immediately one behind the other on each longitudinal side surface 6 so that the bottom 37 of these recesses 2 is wavy. Between the recesses 2 on both longitudinal side surfaces 6 is the undulating ridge 9, which advantageously has constant thickness over its length. The course of the web 9 is provided so that it extends in each case between the longitudinal side surfaces 6 of the lamella 3.

The lamellae 3 are placed against each other so that the webs 9 of adjacent lamellae 3 run in opposite directions. This results in a high strength of the lightweight panel formed from the slats 3.

The recesses 2 are designed so that the web 9, the longitudinal side surfaces 6 intersects. As a result, the recess-free zones 7 are formed on the longitudinal side surfaces, which, however, are very short. These well-free zones 7 are located on each crest. This allows a stable lateral bonding of the slats 3 can be achieved. The wave crests of adjacent lamellae 3 meet at the glued-together longitudinal side surfaces 6 of adjacent lamellae 3. The depressions 2 can be provided in half the thickness of the lamellae 3. But it is also possible that the recesses 2 according to the embodiment according to Fig. 14 lying off-center.

Fig. 16 shows the possibility of connecting the slats 3 together so that the webs 9 are parallel to each other.

The lightweight panel according to Fig. 17 has substantially the same design as the plate according to Fig. 15 , The webs 9 do not extend undulating over the entire length of the blade 3, but end at a recess-free zone 7. Depending on the design of the blade 3, two or more such zones 7 may be provided, between which the web 9 extends wave-like.

Fig. 18 shows a plate 1, the fins corresponding to the plate 1 according to Fig. 16 are arranged. The webs 9 of the lamellae 3 thus run parallel to each other. Similar to the previous embodiment, the webs 9 do not extend over the entire length of the slats 3. It has the well-free solid zone 7. Over the length of the slats 3 more such massive zones 7 may be provided. The wave-shaped webs 9 then extend between these massive zones 7.

The webs 9 of the embodiments according to the 15 to 18 are sinusoidal. The waveform can also be formed, for example, parabolic or in any other way.

Fig. 19 shows a lightweight board 1, consisting of slats 3 according to the 15 to 18 can be made. The fins 3 are provided on a longitudinal side surface 6 with the recesses 2, which are separated by a respective web 9. The depressions 2 may have different course in the longitudinal direction of the slats 3. Accordingly, the depressions 2 from each other separating webs 9 in the longitudinal direction of the slats 3 have a different cross-sectional education.

At the recesses 2 opposite longitudinal side surface 6 of the slats 3 is provided over the length of a continuous longitudinal groove 24 which has over the length of the slats 3 advantageously constant depth. The bottom 37 of the recesses 2 is provided with an opening 21, whereby the recesses 2 are connected to the longitudinal groove 24. The openings 21 lead to a further reduction in the weight of the plate. The lightweight board 1 may advantageously be provided with the (not shown) recess-free zones 7.

The depressions 2 and / or the longitudinal groove 24 are in half the thickness of the slats 3. It is also according to the embodiment according to Fig. 14 possible to arrange the recesses 2 and / or the longitudinal groove 24 off-center. In the illustrated embodiment, the recesses 2 and the longitudinal groove 24 have the same depth. It is of course possible that the Recesses 2 have a different depth than the longitudinal groove 24. Also, the recesses 2 may be at least partially designed differently on the one longitudinal side surface 6 of the slats 3.

In the embodiment according to Fig. 20 are on both longitudinal side surfaces 6 of the slats 3 of the lightweight panel 1, the wells 2 arranged alternately on both sides. The recesses 2 are separated on each longitudinal side surfaces 6 by the webs 9 from each other. The webs 9 have an example sickle shape and extend in half the length each to the adjacent longitudinal side surface 6. The sickle shape of the webs 9 results from the fact that the first continuous web is provided with the openings 21, so that the recesses 2 connected on opposite sides are. Due to the openings 21, the weight of the lightweight panel 1 can be further reduced.

The plate 1 may be provided with the recess-free zones 7 in order to attach fasteners and the like to the plate 1 can. The recesses 2 are advantageously neither halfway up the fins 3, but may also lie off-center, as with reference to the embodiment according to Fig. 14 has been explained. Further, the recesses 2 along the one or the other longitudinal side surface 6 of the lamella 3 may have different cross-sectional shape.

Fig. 21 shows a lightweight panel 1 having a plurality of longitudinal grooves 24 which are milled in at least one side of the plate surface and preferably parallel to the slats 3. It is also possible that the longitudinal grooves 24 extend at right angles to the slats 3. The lightweight panel has in the embodiment in the slats 3, the undulating ridge 9, as in the embodiments according to the 15 to 20 is shown by way of example. The longitudinal grooves 24 can be inserted so deep into the plate 1 that they extend into the recesses 2 of the slats. Then the webs 9 are at least partially visible on the top of the plate. Due to the longitudinal grooves 24, the weight the plate 1 is substantially reduced. It can also be advantageously used as an acoustic panel.

According to the embodiment Fig. 22 the lightweight board 1 as recesses a plurality of holes 25 which are introduced in at least one side of the disk surface. The holes 25 may be provided in a row or in a different pattern on the plate 1. The holes 25 can be advantageously introduced into each shape of the plate 1. The holes 25 may be so deep that they protrude into the cavities 34. The holes 25 have a circular outline. They can be mounted so that they intersect the longitudinal side surfaces 6 of the adjacent lamellae 3.

The lightweight panel 1 according to Fig. 23 has as recesses a plurality of slits 26, which are provided according to the previous embodiment on at least one plate top. The slits 26 may be parallel to the longitudinal direction of the adjacent slats 3 or, as in Fig. 23 represented, perpendicular to this longitudinal direction to be arranged. The slits 26 can be introduced in series or in another pattern in the corresponding top plate. In the exemplary embodiment, the slits 26 are arranged in rows, with the slits 26 of one row lying between the slits 26 of the adjacent row. The slits 26 may have any desired outline. Advantageously, they are introduced into any shape of the lightweight board. The slits 26 may be so deep that they reach into the cavities 34 of the plate 1. Then the webs 9 between the wells 2 are visible. Even with such a design of the plate 1 results in a significant weight reduction. These panels are ideal for use as acoustic panels. The slits 26 are provided in the corresponding top plate so as to intersect the longitudinal side surfaces 6 of the adjacent slats 3. The maximum width, measured transversely to the longitudinal direction of the slats 3, in this case corresponds approximately to the width of the slat 3. Of course, the slits 26 may also be shorter.

Fig. 24 shows a lightweight panel 1, which has at least one top plate as recesses a plurality of grooves 27 which are advantageously milled. The grooves 27 extend perpendicular to the longitudinal direction of the adjacent slats 3. The grooves 27 may extend over a plurality of slats 3. It is also possible that the grooves 27 extend over the entire width of the adjacent lamellae 3. If the grooves 27 are so deep that they reach into the cavities 34 of the plate 1, the webs 9 can be seen.

The grooves 27 are spaced next to each other and parallel to each other. The grooves 27 can also run obliquely to each other. It is also possible that the grooves 27, for example, have a wave-shaped, zig-zag or other course. The grooves 27 also lead to a significant weight reduction of the plate 1, without their strength is impaired.

Fig. 25 Finally, shows a lightweight panel 1, in which the slits are formed as freeforms 28. The free forms 28 are characterized by the fact that they can have a wide variety of outline shapes, as they are shown by way of example. These free forms 28 are advantageously milled into at least one plate top. The freeforms 28 can be so deep that they protrude into the cavities 34 of the lightweight building board 1. Then the webs 9 are visible.

The described lightweight panels 1 can be placed on each other and connected to each other, for example, glued. In this way, a lightweight panel 1 'is obtained, which consists of at least two flat superposed lightweight panels 1. Fig. 26 shows, by way of example, in section, a lightweight building board 1 'formed from three flat superposed lightweight building boards 1'. The lightweight panels 1 may be formed in one of the previously described embodiments. Within the lightweight board 1 'same or different lightweight panels 1 can be used. The lightweight panels 1 can in the same position of their slats 3, 10th be on top of each other. Advantageously, however, adjacent lightweight panels 1 are offset by 90 ° to each other.

Fig. 27 shows in section a lightweight panel 1 ', which is formed of four flat superimposed and mutually firmly connected lightweight panels 1. The lightweight panels 1 may have one of the previously described embodiments. Advantageously, adjacent lightweight panels 1 are each rotated by 90 ° and placed firmly together.

Like the exemplary embodiments of FIGS FIGS. 26 and 27 show, formed from the individual lightweight panels 1 plate 1 'stability advantages and properties, as they are known in plywood or multilayer and sandwich panels.

Fig. 28 shows the possibility to accommodate a filling material 29 in the cavities 34 of the lightweight panel 1. The type of filling material 29 depends on the intended use of the lightweight building board 1. Thus, the filling material may be, for example, a thermal insulation material 30. It is also possible to use as filling material 29, for example polyurethane foams, which allow additional consolidation and stabilization of the lightweight building board 1. The thermal insulation material 30 in the cavities 34 leads to optimal thermal insulation properties of the lightweight panel 1. In the cavities 34 of the lightweight panel 1, only one type of filler can be accommodated. In principle, however, it is also possible to provide different filling material in the cavities 34 so that the lightweight building board 1 can be optimally adapted to its application.

Also Fig. 29 shows a lightweight board 1, the cavities 34 are provided with filling material 29. The difference from the previous embodiment consists only in that the blades 3 of the embodiment according to Fig. 28 an education accordingly Fig. 9 have, while the slats 3 of the embodiment according to Fig. 29 according to the embodiment according to Fig. 1 are designed.

The lightweight panel 1 after Fig. 30 has the cavities 34 which are separated from each other by the webs 9. The webs 9 have a Z-shaped cross-section, whereby the cavities 34 have a corresponding Z-shaped outline. This Z-shaped configuration of the webs 9 has the advantage that the cavities 34 intersect each other transversely to the plane of the plate. Accordingly, adjacent cavities 34 also overlap one another, viewed transversely to the plane of the plate. The cavities 34 in turn contain filling material 29 which, in the exemplary embodiment, is a material which is difficult to seep, such as dried sand, granules, quartz sand and the like.

An overlap of the cavities 34, viewed transversely to the plane of the plate, can also correspond to a formation of the webs 9 Fig. 31 be achieved. The webs 9 extend obliquely in this case, wherein the inclination angle of the webs 9 is so large that adjacent cavities 34, seen transversely to the plane of the plate, overlap each other.

By the filling material 29, 30, the weight of the lightweight panels is increased. Since the lightweight board 1 itself has a low weight due to the various configurations, the weight is increased to only tolerable degree by the filling 29, 30. The lightweight construction board provided with filling material can be used for example as a soundproofing element, sound absorption element or as a security element for doors, walls, furniture parts and the like. For example, if the filling 29 is made of sand, and the webs 9 are provided so that adjacent cavities 34 overlap each other ( Fig. 30 and 31 ), then such a lightweight board 1 can be used as a security element for higher protection resistance classes. Due to the overlap of adjacent cavities 34, the filling 29, 30 extends over the entire cross-sectional area of the lightweight building board 1.

Fig. 32 Finally, shows a lightweight panel 1, which consists of the juxtaposed and firmly connected slats 3. The lightweight board 1 is provided on both sides each with a cover layer 32, so that the lightweight board is designed in the manner of a sandwich plate, which is used for example for interior doors, blockboards and the like can be. The cover layers 32 are made of board material, in particular MDF (Medium Dense Fiberboard), HPL (High Pressure Laminates) or CPL (Continuous Pressure Laminates), plywood, veneer and the like. The cover layer 32 serves as a cover for a part of the recesses 2 of the lamellae 3. Adjacent lamellae 3 are in this embodiment in each case rotated by 90 ° to each other. This has the consequence that the wells 2 are each next but three fins directed to the top of the sheet.

The cover layers 32 are advantageously glued to the lightweight panel 1. The slats 3 have in the embodiment of square outline, but may also have rectangular outline. In the exemplary embodiment, the slats 3 have a cross-sectional shape as the slats according to Fig. 1 , But the lamellae can also have a design according to the other described embodiments.

Fig. 33 shows a blade 3, in which the recesses 2 are executed at the two longitudinal side surfaces 6 each unequal depth. The depressions 2 are introduced unequally deep in the bottom 37 of the wells 2 and the web 9 has oblique sides. As a result, the lightweight board 1, depending on the installation position on a different flexural strength. Due to this design of the recess 2 to the plate level, the weight for a static load can be further reduced when using the lightweight panel 1.

The slat 3 according to Fig. 34 has essentially the same training as the slat according to Fig. 33 , The depressions 2 are carried out in the bottom 37 each starting from the longitudinal side surfaces 6 with a slope. The web 9 is symmetrical. Due to this embodiment of the web 9, the flexural strength of the lightweight panel 1 increases.

Fig. 35 shows the possible creation of one or more fins with recesses 2. The fins 3 are cut from a workpiece 42 by means of one or more saws 43 are provided in the raw state with recesses 2 on one or both sides. This is done with milling tools 44 from above or below mutually. The milling tools 44 preferably rotate in the opposite direction to the workpiece feed direction. The milling tools 44 are retracted radially into the material with an entry and exit curve 20. Due to the suitable time of insertion and removal of the milling tools 44 with respect to the feed direction v, the recess-free zones 7 are formed. Advantageously, the illustrated embodiment of the lamellar generation when the material is rectangular and is processed to the reference plane x. However, the same machining operation can also take place to the reference plane y with the respective horizontal machining tools shown are inserted vertically. The lightweight panel 1 is now created by respective rotation of the slats 3 by 90 ° and gluing the longitudinal side surfaces. 6

The described and illustrated embodiments show possible embodiments of the lightweight panel 1. However, the invention is not limited to the illustrated and described embodiments.

Claims (14)

1. Lightweight construction board (1), which is composed of at least two elongated lamellae (3) that are adjacent jointed with each other of which at least one longitudinal side (6) has at least one groove-shaped recess (2, 19) in longitudinal direction and which shows a bottom (4) that overflows in longitudinal direction of the lateral surface (6) of the lamella (20), only occupies parts of length and width of the lamella (3) and if the lamellae (3) are joint at least forms a part of a hollow (34) within the lightweight construction board (1) of which the lateral surfaces (20) of the recess (2, 9) overflow in the longitudinal side (6) of the lamella (3) and are built by an immersion and emerging curve which are created by moulding the recess (2, 19) in the longitudinal side (6) of the lamella (3) with a moulding tool (44), characterized in that the lightweight construction board (1) is faced laterally and the hollows (34) of the lightweight construction board (1) are not observable in a way that the lightweight construction board (1) looks like an ordinary solid board.
2. Lightweight construction board according to claim 1,
   characterized in that the lamella (3) has at a least one groove-shaped recess in longitudinal direction (2,19) at its opposing longitudinal sides (6) which are separated by a web (9) in longitudinal direction.
3. Lightweight construction board according to claim 2,
   characterized in that the web (9,) which is located at the longitudinal side (6) of the lamella (3), spans advantageously over the length of the lamella (3).
4. Lightweight construction board according to one of the claims 1 to 3,
   characterized in that the web (9) is flat and spans advantageously vertically towards the top of the panel.
5. Lightweight construction board according to one of the claims 1 to 4,
   characterized in that the web (9) spans inclined towards the top of the panel advantageously in z-shaped profile.
6. Lightweight construction board according to one of the claims 1 to 5,
   characterized in that the adjacent lamellae (3) are put together with their longitudinal sides (6) in a flat way advantageously with its adjacent lamellae (3) which show profiling (18, 18') at their longitudinal sides (6) which fit in each other and are joint by a gluing film.
7. Lightweight construction board according to one of the claims 1 to 6,
   characterized in that the groove-shaped recess (2, 19) in the lightweight construction board (1) is shut by at least one cover (10) that is built advantageously by the side lamellae.
8. Lightweight construction board according to claim 7,
   characterized in that the side lamella (10) has the same profile as the lamella (3) preferably at least on one outer zone of the lightweight construction board (1).
9. Lightweight construction board according to one of the claims 1 to 8,
   characterized in that the recesses (2, 19) are located symmetrically in the lamella (3), preferably also asymmetrically.
10. Lightweight construction board according to one of the claims 1 to 9,
    characterized in that the lightweight construction board is located between at least two top layers (32), preferably that the web (9) spans undulate at least at a part of the lamella (3).
11. Lightweight construction board according to one of the claims 1 to 10,
    characterized in that the recesses (2) on opposing longitudinal sides (6) of the lamella (3) are connected via breaches (21) in the web(9).
12. Lightweight construction board according to one of the claims 1 to 11,
    characterized in that the hollows (34) in the lightweight construction board (1) are provided in a way, if the lightweight construction board (1) is viewed from top, that they overlap and that preferably at least a few of the hollows (34) are filled with a stuffing (29, 30, 31), preferably foamed plastic functioning as an insulation material.
13. Lightweight construction board according to claim 12,
    characterized in that the stuffing is noise insulating/sound absorbing, preferably bulletproof heavy material.
14. Lightweight construction board according to one of the claims 1 to 13,
    characterized in that the adjacent lamellae (3) are connected by at least one tongue 17).

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