DD280654A3 - LIGHTWEIGHT CORE - Google Patents

Abstract

Lightweight core for Skibau or for the woodworking or construction industry consisting of surface elements with smooth and wavy layers, characterized in that the cavity axes individually, in pairs, or blockwise offset by the same or different angles to special, static and dynamic properties achieve.

Description

For this 2 pages drawings

Field of application of the invention

The invention relates to a lightweight core, as it can be used in ski construction or as composite panels in the woodworking and construction industry.

Characteristic of the known technical solutions

A variety of composite core plate materials are known in the art. Thus honeycomb cores with a hexagonal cross-section, round cross-section, but also corrugated layers are used. The latter are described in DE OS 3338661 A1 and DD PS 235048 A5.

The lightweight core described in DE OS 3338661 A1 consists of an impregnated paper-like material which is formed by layering undulating films with intermediate documents', wherein the waves are glued at their valleys and peaks with the intervening documents and the film layers in use standing on pressure are charged. Disadvantage of this embodiment is the insufficient dynamic load capacity that makes bereics noticeable during processing to the ski component. Due to increased technological complexity, however, it is possible to compensate for the disadvantages that the Kernmatorial Veraroeitungsprozeß with it, and in addition can be partially eliminated by consuming high-quality Zuggurt and Druckgurtbauteile and additional use of special side cheeks. These increased economic expenses are now to be eliminated with the DD PS 235048 A 5. This patent describes a lightweight core with support shafts, wherein between the adjacent Stützwellan layered reinforcing zones are arranged, each containing at least one Versteifungswslle of sheet materials whose shaft surfaces perpendicular to those of the support shafts, optionally at least a portion of the support shafts and / or stiffening shafts each at least connected on one side with a flat stabilizing layer of sheet material. Although this embodiment improves the dynamic characteristics a little, but significantly reduces the pressure capacity. It is essential that the torsional stiffness is thereby slightly improved rur.

Object of the invention

It is an object of the invention to develop a lightweight core, on the one hand besi'zzt a high pressure capacity and on the other hand ensures good dynamic characteristics at high torsional stiffness.

Essence of the invention

Cause of the disadvantages of DE OS 3338661 A1 is that the standing parallel to each other arranged cavity '-. Hsen allow high elasticity of the stiffening cell system. The causes of the disadvantages of DD PS 235048 A5 are due to the fact that not all cavity axes are arranged in the load direction, the elasticity of the system hardly improved, but the compressive strength is greatly reduced.

The invention is therefore based on the object to develop a Leicl-tbaukern, in which targeted due to a special arrangement of the support waves, the elasticity and Druckbelastbatkoit the respective requirements optimally adapted.

The object is achieved in that the Leichtbauerkn is constructed of individual impregnated surface elements, wherein a surface element consists of a corrugated layer and a smooth layer, which are connected to each other in the turning points of Wellage, wherein the surface elements described are arranged to each other that the cavity axes with respect to the druokbelasteten surface an angle a _n of 89-45 ° include and the cavity axes of the adjacent surface elements offset by the same or different angles to each other or pairwise or blockwise parallel to each other by the same or different angle a "to each other. According to this advantageous embodiment, it is possible with the lightweight core according to the invention, by targeted variations of the arrangement of the cavity axes to the level of pressure load, all werdoi required elasticity parameters.

It is essential that on the one hand, the respective adjacent cavity layers are offset from each other by the same angle to Ebeno the pressure load and on the other hand, the respective adjacent layers to each other with different

Angles can be offset from the plane of the pressure distribution. It is also characteristic that the shaft layers are displaced in blocks one after the other in the manner described above, wherein a corrugation block consists of two or more layers arranged parallel to one another. This latter embodiment can be designed so that such a parallel and inclined block in its use as Skikern makes up half and more of the total ski width, whereby a so-built ski gets optimal properties, especially in the freestyle technique

 The invention will be explained with reference to 4 exemplary embodiments, wherein in

Fig. 1: Lsichtbaukern with adjacent equally offset surface elements

Fig. 2: lightweight core with adjacent unequally offset surface elements

Fig. 3: lightweight core mix in pairs equal offset surface elements

Fig.4: lightweight core with pairwise uneven offset surface elements

Fig. 5: lightweight core with blockwise staggered arrangement

are shown.

AusfOhrungsbelsplelo

1st example

The following is the Lösit g invention, which can be used both in ski for popular sports and in competitive sports will be described. On the merits of the solution according to the invention when using this in the woodworking and construction industry will not be discussed further in the following remarks, as they are analogous to the benefits in ski construction.

In the field of cross-country skiing and touring sport, a question of lightweight, easily processable. And high-strength core material is gaining more and more importance. Of particular importance are high pressure absorption capacity, good dynamic characteristics and high torsional stiffness of the core material used.

In Fig. 1, a section of a symmetrically constructed lightweight core is shown. The lightweight core is composed of individual surface elements 3, wherein a corrugated layer 2 is disposed on a smooth layer 1, which are firmly connected to each other in the turning points 4 of the corrugated. The smooth position of the adjacent surface element 3 is again firmly connected to the free inflection points 4 of the corrugated with the first surface element. Essential for a high torsional rigidity and a good dynamic behavior of the ski core material are that the corrugations enclose an angle a _n relative to the pressure-loaded surface. In order to ensure a uniform load bearing and distribution, in Fig. 1, the respective adjacent corrugations were arranged at the same angle α of 60 °, and aufgiund the definition of the angle α, the respective adjacent corrugations are mutually offset by the same angle. This arrangement of individual surface elements to form a lightweight core for skis ensures excellent processability during skikeil manufacture and when used in finished skis a very high torsional stiffness with excellent surface pressure distribution.

2nd example

In Fig. 2, a further embodiment of the solution according to the invention is shown, wherein Jie Hohlrsumachsen 6 of the adjacent surface elements at different angles α, and a ₂ are arranged. This arrangement ensures a good surface pressure distribution with gezip'.ter specification of the torsional stiffness and special load distribution, as they are required in particular for the production of ski cores for the high performance sport.

3rd example

Another embodiment of a uniformly oriented load bearing and distribution as Example 1 is shown in Fig. 3. In this case, the adjacent surface elements are paired in the same direction in the same direction and arranged offset to the adjacent pair by the same angle. Analogously to Example 2, in order to achieve the advantages explained in Example 2, an unequal displacement of the surface element pairs is conceivable. In this case, the term pair does not refer to the arrangement of in each case two identically oriented surface elements, but should be understood as a uniform positional orientation in the form, that in addition to 2,3 or 4 oriented in the same direction surface elements ebenfals again the same number of 2,3 or 4 oriented in the other direction surface elements are arranged.

4th example

In competitive sports, especially when using the skis for freestyle technique, it is necessary to give the right and / or the left ski specifically precisely defined properties, depending on the imprinting force and the technique used by the runner.

With the construction of the ski core according to the invention, it is now possible to meet these high requirements by blockwise displacement of the surface elements. Such a specific embodiment is shown in FIG. Here are, as shown in FIG. 5, arranged over the ski width 10 surface elements, wherein on the right side 5 surface elements in the same direction at the angle a ₃ are orientation oriented, the immediately adjoining 5 lying in the "middle" surface elements in the other Direction at the same angle a ₂ are orientation-oriented and arranged on the left side 2 surface elements are oriented at the angle αϊ in the same direction as the right-lying surface elements.

All of the embodiments described provide itatic and dynamic characteristic values tailored specifically to the application, with the solution according to the invention for the first time being able to produce ski skis of varying elasticity and torsional rigidity from the same core material with the same weight corresponding to the respective requirements.

Claims (2)

1. lightweight core, in particular for ski construction, of several impregnated surface elements consisting of interconnected in the turning points wavy and smooth layers, characterized in that the cavity axes (6) of the corrugated layers against the pressure-loaded surface (5) different angles a _n from 89-45 °. 2. Lightweight core according to claim!, Characterized in that dia cavity axes (6) of adjacent surface elements (3) or pairs (7) or blocks (8) of surface elements (3) by the same or different angles a _n are offset from each other.