AT522567A4 - Lightweight construction element made of wood - Google Patents

Abstract

Lightweight construction element (1) made of wood comprising an essentially flat first layer (2) and a second layer (3) bonded to the first, the second layer (3) forming alternating, oppositely directed first and second folds (4, 5) is gathered, the first folds (4) each having an apex (8) and on both sides of the apex (8) a flank (8, 9) glued to a flank (8, 9) of an adjacent first fold (4) and the second Folds (5) each have an apex (11) and, on both sides of the apex (11), a flank (12, 13) spaced apart from a flank (12, 13) of an adjacent second fold (5), and the second layer (3) is glued to the first layer (2) at the apices (8) of its first folds (4) or at one of its end faces (6, 7) running transversely to the folds (4, 5).

Description

EUROPEAN PATENT AND TRADEMARK ATTORNEY A-1130 VIENNA: KOPFGASSE 7

08441 Michael Schmidt A-8862 Stadl-Predlitz (AT)

The present invention relates to a lightweight construction element made of wood comprising an essentially flat first layer and a second layer glued to the first.

Due to their simple processing, their good mechanical and thermal properties and the environmental compatibility over their entire useful life and beyond, e.g. Used in wood construction and furniture and model carpentry. In addition to solid wood, multi-layer elements have also been used for a long time, e.g. Plywood, laminated wood, veneer strip wood or laminated timber elements. At least two, mostly three or more layers of the same or different wood fiber directions and / or types of wood are glued together, e.g. glued. In this way, components with more homogeneous properties and usually also higher strength are achieved than could be achieved with conventional solid wood elements.

However, such elements are generally not at all, at least not significantly lighter, i.e. l1 lighter than solid wood and therefore not better suited as lightweight construction elements. In order to achieve lightweight construction elements, e.g. known from DE 10 2008 022 805 A1, zigzag or si-

to produce nut-shaped corrugated veneers and put them on both sides, i.e. at

WEISER & VOITH PATENTANWÄLTE PARTNERSCHAFT + FN 463913A - KOPFGASSE 7 - A-1130 VIENNA: WWW.PATENTE.NET TEL +43 (1) 8791706 - FAX +43 (1) 8791707 - MAIL @ PATENTF, NET - IBAN AT102011100W003856704 - IBAN AT102011100W003856704 - ATU71838648

From EP 3 037 600 B1l a lightweight wood construction element is known in which several corrugated veneer layers are glued one above the other to form a stack, in which stack the corrugated cutting directions of two adjacent glued veneer layers are each at right angles to one another; On two opposite ends of the stack of corrugated veneer, a plane layer of wood is glued to the stack. In this way, lightweight construction elements of great thickness and strength can be produced; a buckling of the waves is hardly likely. However, due to the only slight wave shape that can be achieved when cutting, the ratio of wood-based material to empty space is not very favorable overall, so that only little weight is saved compared to solid wood. On the other hand you would

cut the veneers in a stronger wave shape, so each

The aim of the invention is to create a lightweight construction element made of wood, which combines high flexural and torsional rigidity with compressive elasticity and high compressive strength, while being lightweight and flexible in use.

This goal is achieved according to the invention with a lightweight construction element of the type mentioned, which is characterized in that the second layer is gathered into alternating, oppositely directed first and second folds, the first folds each having an apex and one on both sides of the apex a flank of an adjacent first fold have glued flank and the second folds each have an apex and on both sides of the apex a flank spaced apart from a flank of an adjacent second fold, and wherein the second layer at the apices of its first folds or on one of their transverse to Fold extending end faces is glued to the first layer.

This results in a kink-free, approximately meandering course of the second layer with different radii of curvature of its first and second folds transversely to the folds. The glued together flanks of the first folds bring high

Stability, bending and torsional rigidity of the lightweight construction

In a favorable embodiment, one of the first folds has an apex that is widened compared to the other first folds. The fold with the flared apex forms a channel into which other components can be inserted, e.g. Cables, pipes or the like. Depending on your needs. This creates additional possible uses for the lightweight construction element.

A particularly advantageous embodiment is characterized by a third layer, which alternately

following, oppositely directed first and second

An alternative embodiment to this comprises a third layer which is gathered into alternating, oppositely directed first and second folds, which second folds mesh with the second folds of the second layer, the first folds of the third layer each having an apex with which the apex a second fold of the second layer is glued inside the first fold of the third layer, and on both sides of the apex have a flank glued to a flank of an adjacent first fold of the third layer and the second folds of the third layer each have one inside a first fold of the second layer with the apex glued to the apex and on both sides of the apex one

have a flank, and where the second and third layers

It is advantageous if at least one of the first, second and third layers is made of veneer. Veneer is thin and light, easy to manufacture and has high tensile strength (at least in its fiber direction), which leads to a stable lightweight construction element. By choosing the veneer thickness or type of wood, the weight and stability of the lightweight construction element can be flexibly adapted to various requirements and applications over a wide range.

Alternatively, at least one of the first, second and third plies is made of ply wood or strip wood. Compared to single-ply veneer, this leads to a significantly more uniform, usually higher force absorption and load-bearing capacity of the lightweight construction element, which is also made possible by the choice of different ply woods, e.g. Plywood or laminated wood, or wood veneer strips, can also be adapted to particularly high demands on torsional and / or flexural strength.

In this case it is favorable if the ply wood or veneer strip wood is made of different types of wood in its thickness direction or across it. This enables an even more extensive adaptation to specific requirements.

A preferred embodiment is characterized by a

to the first essentially parallel fourth layer, with which

7127

Surface can be used flexibly.

1 and 2 each show a detail of an embodiment of a lightweight construction element according to the invention made of wood in a perspective view obliquely from above; and

3 to 8 each show a detail of a further embodiment of the lightweight construction element according to the invention in a side view.

Fig. 1 shows a first embodiment of a lightweight construction element 1 made of wood. The lightweight construction element 1 has a first layer 2 which is essentially flat; “Essentially” in this context means that the first layer 2 is flat over its entire surface or can have a slight curvature. Furthermore, the lightweight construction element 1 comprises a second layer 3 which is glued to the first layer 2, e.g. glued, is. The second layer 3 is gathered into alternating first and second folds 4, 5, i.e. multiple curved. The first and second folds 4, 5 are directed in opposite directions; In the illustration of FIG. 1, the first folds 4 are directed downwards and the second folds 5 are directed upwards. On a front end face 6 of the second layer 3 it can also be seen that the first and second folds 4, 5 extend from one another in their respective radii of curvature rı, Ir; differ, where the radius of curvature rı of the first folds is 4 larger

is greater than the radius of curvature r, of the second fold 5. So it

The first folds 4 each have an apex 8 and on both sides of the apex 8 a flank, i.e. (In the view of FIG. 1) a left flank 9 to the left of the apex 8 and a right flank 10 to the right of the apex 8 of the first fold 4. The left flank 9 of a first fold 4 is in each case with the right flank 10 of an adjacent one on the left first fold 4 and the right flank 10 of the first fold 4 is glued to the left flank 9 of a first fold 4 adjacent to the right.

Similarly, the second folds 5 each have an apex 11 and a flank on both sides of the apex 11, i. (in the view of FIG. 1) a left flank 12 to the left of the apex 11 and a right flank 13 to the right of the apex 11 of the second fold 5. In contrast to the first folds 4, the flanks 12, 13 of the second folds 5 are due to their smaller radius of curvature 'r ,; each spaced from the flanks 12, 13 of an adjacent second fold 5, i.e. the left flank 12 of a second fold 5 is spaced from the right flank 13 of a second fold 5 adjacent to the left, and the right flank 13 of the second fold 5 is spaced from the left flank 12 of a second fold 5 adjacent to the right. 5 successive, they go over into each other, ie that e.g. a right flank 10 of a first

th fold 4 without a discernible delimitation into a left one

Flank 12 of (viewed from left to right) following second fold 5 of second layer 3 passes over.

The lightweight construction element 1 of FIG. 2 differs from that of FIG. 1 in that, in the example of FIG. 1, the second layer 5 is glued to the first layer 2 at apices 8 of its first folds 4. In contrast to this, in the example in FIG. 2, the second layer 3 is glued to the first layer 2 on one of its end faces 6, 7 (here: the rear end face 7) running transversely to the folds 4, 5.

In the optional exemplary embodiment in FIG. 3, one of the first folds 4 of the second layer 3 has an apex 8 that is widened compared to other first folds 4. this first fold 4 is e.g. as a result of an at least partially larger radius of curvature rı of its apex 8 and / or due to a flat section 14 in the apex 8 as in this example, wider than other first folds 4. This results in a greater distance between the left and right flanks 9, 10 of this first fold 4 and at the same time a greater distance between the two next second folds 5 in the alternating sequence. The lightweight construction element 1 thus forms a channel 15 in which, for example Pipelines, electrical lines or the like. inserted or snapped between the second folds 5.

FIG. 4 shows a further optional embodiment of the lightweight construction element 1 with a third layer 16. Also the third

Layer 16 is to alternate first and consecutive

The first folds 17 of the third layer 16 - directed upwards here - each have an apex 19 and on both sides of the apex 19 a flank 20, 21, which (as in the second layer 3) with a flank 20, 21 of an adjacent first fold 17 the third layer 16 is glued. The second folds 18 of the third layer 16 each have an apex 22 and a flank 23, 24 on both sides of the apex 22. The flanks 23, 24 of the second folds 18 of the third layer 16 each have a flank 12, 13 of an adjacent second Fold 5 of the second layer 3 glued together so that the second and third layers 3, 16 are glued to one another at the flanks 12, 13, 23, 24 of their intermeshing second folds 5, 18. The second and third layers 3, 16 are spaced from each other at the apices 8, 11, 19, 22 of their first and second folds 4, 5, 17, 18, i.e. the vertices 8 of the first folds 4 of the second layer 3 are in particular of the vertices 22 of the second folds 18 of the third layer 16 and 16

the apices 11 of the second folds 5 of the second layer 3 are

The lightweight construction element 1 in the example of FIG. 4 also has a first layer 2 which is made of plywood (here: a two-layer plywood). Alternatively, instead of a plywood in which the wood fibers of adjacent layers are each at right angles to one another, e.g. be a plywood, in particular laminated veneer lumber, in which adjacent layers do not have perpendicular, but mostly parallel wood fiber directions; instead of ply wood, the first layer 2 could also be made of wood strips or the like. be. Alternatively or in addition, the second and / or third layer 3, 16 made of ply wood, wood veneer or the like. as will be explained in more detail below with reference to the example of FIG.

It goes without saying that in the exemplary embodiments without a third layer 16, the first and / or second layer 2, 3 each consist of ply wood, wood veneer strips or the like. can be. Furthermore, in some embodiments, the first, the second and / or the third layer 2, 3, 16 is made of veneer.

FIG. 5 shows an embodiment alternative to FIG. 4, in which the third layer 16 again corresponds to an overturned second layer 3. In this case, too, the third layer 16 is gathered to form alternating, oppositely directed first and second folds 17, 18, the two

th folds 18 of the third layer 16 with the second folds 5 of the

Comb the second layer 3. Again, the first folds 17 of the third layer 16 each have an apex 19 to which - in contrast to the exemplary embodiment in FIG. 4 - the apex 11 of a second fold 5 of the second layer 3 is glued inside the first fold 17 of the third layer 16 . On both sides of the apex 19, the first fold 17 of the third layer 16 each has a flank 20, 21 which is glued to a flank 20, 21 of an adjacent first fold 17 of the third layer 16, i.e. again a left flank 20 with a right flank 21 of the first fold 17 adjacent to the left, etc. Likewise, the second folds 18 of the third layer 16 each have an apex 22 glued to the apex 8 inside a first fold 4 of the second layer 3 and on both sides of the Apex 22 each have a flank 23, 24. The second and third layer 3, 16 are - in contrast to the example of FIG. 4 - from one another on the flanks 9, 10, 12, 13, 20, 21, 23, 24 of their first and second folds 4, 5, 17, 18 spaced apart.

In the example of Figure 5, the lightweight construction element 1 further comprises an optional fourth layer 25, e.g. Veneer, ply wood, wood veneer strips or the like. The fourth layer 25 is essentially parallel to the first layer 2 and is therefore just as flat or slightly curved as this. With the fourth layer 25, the third layer 16 is glued to the apices 19 of its first folds 17. The fourth layer 25 is thus at that of the first

th layer 2 opposite side of the second layer 3 with the

It goes without saying that, as an alternative to this, the fourth layer 25, if the second layer 3 were glued to the first layer 2 at one of its end faces 6, 7 running transversely to the folds 4, 5, e.g. on the rear end face 7 (FIG. 2), with the second layer 3 on another of its end faces 6, 7 running transversely to the folds 4, 5 (here: the front face 6) can be glued (not shown). In addition, the third layer 16 can also be glued to the fourth layer 25 at their respective end faces in this case.

In the example of FIG. 6, the lightweight construction element 1 again includes a fourth layer 25, but not a third layer 16. The second layer 3 is on the apices 8 of its first folds 4 with the first layer and on the apices 11 of its second folds 5 with the fourth layer 25 glued. In the exemplary embodiment in FIG. 6, the fourth layer 25 also has optional webs 26 which protrude between adjacent second folds 5 of the second layer 3. Each of the webs 26 is glued to the flanks 12, 13 of two adjacent second folds 5 of the second layer 3.

If the fourth layer 25 has no webs 26, the second layer 3 can alternatively be glued to the first and fourth layers 2, 25 at its two end faces 6, 7, i.e. on the front face 6 with the fourth layer 25 and on the rear

Front side 7 (Fig. 2) with the first layer 2 or vice versa.

FIG. 7 shows a variant of the exemplary embodiment of the lightweight construction element 1 shown in FIG. 3 with an additional third layer 16. In this example, one of the first folds 17 of the third layer 16, as well as a first fold 4 of the second layer that is approximately opposite this 3, an apex 19 that is widened in relation to other first folds 17 of the third layer 16. This again results in a channel 15 which in this case is enclosed between the second and third layer 3, 16.

In the embodiment according to FIG. 8, the first layer 2 is made of a three-layer ply wood, the second layer 3 is made of veneer and the third layer 16, which - comparable to the embodiment of FIG. 4 - consists of the vertices 8, 11 of the second layer 3 at the apices 19, 22 of their first and second folds 17, 18 is spaced apart, made of two-layer ply wood (here: plywood). Each layer 27, 28 of the plywood of the third layer 16 is divided transversely to the end faces 6, 7 into segments 29, 30, 31, 32, which are made of different types of wood and optionally follow one another periodically. In this way, the laminated wood of the third layer 16 is partly made of different types of wood in its thickness direction 33 and in any case transversely thereto. As a result, the strength and flexibility of the third layer 16 can be adapted to the desired requirements.

It goes without saying that instead of or in addition to the third

th layer 16 the first, the second and / or the fourth layer 2,

3, 25 made of ply wood or wood veneer or the like. with different types of wood in its thickness direction 33 and / or transversely thereto. Furthermore, at least one of the first, second, third or fourth layers 2, 3, 16, 25 can extend in its longitudinal and / or transverse direction - e.g. periodic - have varying thickness. In general, the variants and features of the lightweight construction element 1 described for various examples or embodiments can be combined with one another in manifold ways, as can be immediately recognized by specialists. The lightweight construction element 1 can also optionally be integrated into another wooden construction element, e.g. another lightweight component, integrated.

The invention is not limited to the illustrated embodiments, but includes all variants, modifications and combinations thereof that are within the scope of the

closed claims.

Claims (10)

1. Lightweight construction element made of wood comprising a substantially flat first layer (2) and a second layer (3) glued to the first, characterized in that the second layer (3) forms alternating, oppositely directed first and second folds (4, 5) is gathered, the first folds (4) each having an apex (8) and, on both sides of the apex (8), a flank (8, 9) glued to a flank (8, 9) of an adjacent first fold (4) and the second folds (5) each have an apex (11) and on both sides of the apex (11) a flank (12, 13) spaced apart from a flank (12, 13) of an adjacent second fold (5), and wherein the second layer ( 3) is glued to the apex (8) of its first folds (4) or on one of its end faces (6, 7) extending transversely to the folds (4, 5) with the first layer (2). 2. Lightweight construction element according to claim 1, characterized in that one of the first folds (4) has an apex (8) that is widened relative to the other first folds (4). 3. Lightweight construction element according to claim 1 or 2, characterized by a third layer (16) which is gathered to form alternating, oppositely directed first and second folds (17, 18), which second folds (18) with the second folds (5) the second layer (3) comb, the first folds (17) of the third layer (16) each have a tel (19) and on both sides of the apex (19) have a flank (20, 21) glued to a flank (20, 21) of an adjacent first fold (17) of the third layer (16) and the second folds (18) of the third Layer (16) each have an apex (22) and on both sides of the apex (22) one flank (23, 24) glued to a flank (12, 13) of an adjacent second fold (5) of the second layer (3), and wherein the second and third layers (3, 16) are spaced from each other at the apices (8, 11, 19, 22) of their first and second folds (4, 5, 17, 18). 4. Lightweight construction element according to claim 1 or 2, characterized by a third layer (16) which is gathered into alternating, oppositely directed first and second folds (17, 18), which second folds (18) with the second folds (5) the second layer (3), the first folds (17) of the third layer (16) each having an apex (19) with which the apex (11) of a second fold (5) of the second layer (3) inside the first fold (17) of the third layer (16) is glued, and on both sides of the apex (11) a flank (20, 21) glued to a flank (20, 21) of an adjacent first fold (17) of the third layer (16) and the second folds (18) of the third layer (16) each have an apex (22) glued to the apex (8) inside a first fold (4) of the second layer (3) and a flank on both sides of the apex (22) (23, 24) have, and where the second and third layer (3, 16) from each other on the flanks (9, 10, 12, 13, 20, 21, 23, 24) of their first and second folds (4, 5, 17, 18) are spaced apart. 5. Lightweight construction element according to one of claims 1 to 4, characterized in that at least one of the first, second and third layers (2, 3, 16) is made of veneer. 6. Lightweight construction element according to one of claims 1 to 4, characterized in that at least one of the first, second and third layers (2, 3, 16) is made of laminated wood or veneer strip wood. 7. Lightweight construction element according to claim 6, characterized in that the ply wood or veneer strip wood in its thickness direction (33) or transversely thereto is made of different types of wood. 8. Lightweight construction element according to claim 1 or 2, characterized by a fourth layer (25) which is substantially parallel to the first, with which the second layer (3) at the apices (11) of its second folds (5) or at another of its transverse to the folds (4, 5) extending end faces (6, 7) is glued. 9. Lightweight construction element according to claim 8, wherein the second layer (3) at the vertices (8) of its first folds (4) with the first layer (2) and at the vertices (11) of its second folds (5) with the fourth layer (25) is glued, characterized in that the fourth layer (25) between adjacent two te folds (5) of the second layer (3) has protruding webs (26) from each of which is glued to the flanks (12, 13) of two adjacent second folds (5) of the second layer (3). 10. Lightweight construction element according to one of claims 3 to 7, characterized by a fourth layer (25) which is substantially parallel to the first and with which the third layer (16) at apices (19) of its first folds (17) or at least the second layer ( 3) at another of their crosswise to the folds (4, 5) running end faces (6, 7) is glued.