SE457236B - THE SLIDING BOTTLE FOR SKI AND PROCEDURE FOR PREPARING THE DEEP BOTTLE WITH THE GRIP OF A SKI - Google Patents

Description

l7 l5 20 30 35 457 * 236 extends in the same direction as the cells of the wood and thus, terminates obliquely in the sliding surface. The use of fiber threads for this purpose is not in itself a new idea, but in the past the fiber threads have extended from the sliding surface, the so-clad sealskin principle, and the manufacturing methods have proved to be difficult. In addition, Finnish Patent Specification No. 48676 proposes to design the sliding surface of hollow cellulose fibers, which can either be arbitrarily arranged or oriented in any desired manner. However, the "desired orientation" has not been discussed in more detail, and it is not suggested in any way that the desired grip effect without any wax could be achieved by orienting the fibers in a particular manner. is the so-called microporosity, which contributes to the adhesion of the wax.

Nor has the patent specification mentioned in the resin skids been carried out in practice.

Alternatively, it is also possible to use plastic laminates, in which fiber threads are positioned in the same way as in the embodiment with wood laminate.

The invention is described in more detail in the following with reference to the accompanying direction.

Figure 1 is a side view of a ski.

Figure 2 is a bottom view of the ski.

Figures 3 and 4 are constituted by a view from below and a longitudinal section of the grip part of an embodiment of the ski.

Figure 5 is a cross-section of a particular embodiment of the ski.

Figure 6 illustrates the manufacture of the laminate structure used for the sliding bottom of the ski.

Figure 7 is a bottom view of the grip portion of a second embodiment of the ski.

Figure 8 illustrates a combination possibility based essentially on Figures 3 and 4. Figures 15 and 35 illustrate the manufacture of the sliding bottom of a plurality of molded parts.

A ski is generally referred to by the reference numeral 1. The front and rear parts of the ski constitute the so-called sliding parts, and the middle part, which is important with respect to the grip of the ski, is designated by the reference numeral 4.

A specific feature of the ski according to the invention is associated with the middle part 4. The sliding surface of this part is formed by a laminate structure 5, in which the laminate layers are preferably located next to each other or one after the other in the transverse direction of the sliding surface, as shown in Figure 3. The laminate structure 5 may, for example, comprise a wood laminate. In Figure 3, the veneer sheets of the laminate are designated by the reference numeral 6 and the adhesive layers between the veneer sheets by the reference numeral 7.

For the sake of clarity, the adhesive layers 7 are shown in Figure 3 with too great a thickness, and in practice will generally be made substantially thinner than the veneer sheets. The points 8 marked in the adhesive layers denote fibrous threads, preferably fibrous threads of synthetic fibers, such as nylon or glass wool, which end obliquely in the sliding surface. The fiber threads 8 are at least substantially parallel to the wood cells 9 as schematically shown in Figure 4. In the embodiment of the invention shown in Figure 5, a similar laminate structure 5 is also positioned in the sides of the sheath. In this way, an improved grip effect is achieved on steep uphill slopes, in which scissor climbing must be used.

In the following, the production of the laminate structure will be described with reference to Figure 6. The desired number of, for example, veneer sheets 6 and adhesive layers 7, are positioned on top of each other, the layers being pressed together during simultaneous heating, the veneer sheets being impregnated with adhesive so that the wood will no longer absorb moisture. The cells in all veneers extend in the same direction, which in figure 6 is marked by the arrow A. From the laminate structure thus formed a laminate strip 5 is cut out for application in the middle part of the sliding surface of the ski, for example by slanting so that the angle o between the wood cells and the longitudinal direction of the strip 5 is about 10 to 700. The larger the angle u is, the better the grip, but of course the sliding is reduced at the same time to a certain extent. Even a relatively small angle of inclination may be sufficient for an experienced skier.

When the laminate strips are cut out in the manner indicated in Fig. 6 by the reference numeral 5, a bottom of the kind shown in Figure 3 is obtained. Alternatively, it is also possible to cut out the laminate strips in the manner indicated by the reference numeral 10 in Fig. 6. , in which case a bottom of the type shown in Figure 7 is obtained. In this case, the ends of the fiber threads in the sliding surface end at an angle B. Of course, the laminate strip can also be cut obliquely in other ways to obtain, for example, strips in which the laminate layers are located obliquely next to each other, as marked in Figure 8. reference numerals l5 and l6.

It is of course possible to freely combine the cut laminate strips in different ways. This is illustrated by Figure 8, in which the sliding surface consists of a plurality of laminate strips 11 to 20, the longitudinal, transverse and obliquely extending lines representing laminate layers. There are, of course, a large number of variation possibilities. For technical reasons, the laminate constructions in Figures 3 to 8 have been shown to be relatively coarse; in practice, a very smooth sliding surface is obtained, so that it is difficult to feel any roughness if, for example, one strokes the hand along the surface towards the rear end in each particular case. .vw l0 l5 20 25 35 457 236 In order for the adhesive to be able to thoroughly impregnate the veneer sheets, it is advisable to use veneer sheets with a maximum thickness of approx. 1 mm. The thickness of the laminate strip 5 (or 10) on the other hand is generally about 1 to 2 mm.

Preferably, fiber threads 8, which are also parallel to the arrow A, can be positioned in the adhesive layers. A further improvement of the grip is achieved by means of, for example, nylon fiber threads or glass wool fibers.

Although the sliding surface of wood thus impregnated is clearly better than hitherto known sliding surfaces of wood, it may eventually absorb moisture to a certain extent when skiing under so-called zero conditions. To avoid this, a second embodiment is also proposed, in which part or all of the veneer sheets are replaced with plastic layers, between which fibrous threads 8 of the type described above are placed.

In principle, the manufacture can be carried out in the same way.

The plastic layers are heated and compressed, whereby they fuse into a practically completely homogeneous mass with the exception of the fibrous threads which, however, are completely bound in the structure formed, and which are included in the present patent application, on the basis of the manufacturing method. under the name "laminate structure".

The end portions of the fiber wires terminated in the sliding surface provide the required grip. The plastic can be of any quality that is usually used in sliding surfaces for skis, e.g. polyethylene. For the fiber yarns 8, two main types are mainly proposed, which are represented, for example, by nylon and glass wool fibers.

Nylon is generally more resistant to wear than the plastic qualities in question, whereby, as the plastic wears, a very small "pile" is gradually left on the surface. Glass wool fibers, on the other hand, are brittle, and any ends that protrude beyond the sliding surface will break off, forming very small suction holes. By simultaneously using both nylon-type fiber threads and glass-wool fiber-type fiber threads, both a small pile and small suction pits are thus formed.

If polyethylene is judged to be too soft and wears out too quickly, an adhesive layer of, for example, so-called Aralithite adhesive is applied to its surface. When said adhesive is heated by means of a device such as an iron, a harder sliding surface is obtained. Alternatively, it is possible to use nylon instead of using plastic, for example, in which the fiber threads 8 must of course be chosen so that they do not fuse together in the nylon when it is heated and compressed.

Another alternative production method is casting, in which case molded plastic or nylon mass is cast on top of the fiber threads that have been inserted in place in advance. In this case, the sliding surface can of course be cast in one piece, but alternatively, the sliding surface can also be built up of a plurality of cast parts, which production method is illustrated in Figures 9 and 10.

For example, a rod 2l with a circular cross-section can be cast inside, in which the fiber threads are positioned extending in the longitudinal direction. Discs which have an elliptical shape are cut obliquely from the rod, the surface being composed of these. discs- The remaining parts 23 between the discs may be of any sliding surface material.

The cross-sectional shape of the rod 2l can be chosen freely, and it can, for example, have the shape of a letter. This method can also include a text in the sliding surface, i.e. ski manufacturers can, in accordance with the invention, mark the sliding surface of the ski in the same way as has previously been done at all known sliding bottoms.

In the embodiment illustrated in Figure 3, the laminate structure 5 covers practically the entire width of the slide 10 23 457 23.6 the surface of the ski. This need not necessarily be the case, whereby e.g. in the central part of the outer edge a conventional sliding surface can simply be left, even more than what is shown in figure 5. The same of course also applies to sliding surfaces manufactured in accordance with the principle according to figure l0. A resin adhesive, for example so-called Araldit adhesive and so-called Resinol adhesive, can be used as an adhesive layer. Any known structure can be used in the body of the ski, and also the sliding surfaces 2 and 3 are known per se.

The orientation and the even distribution of the fiber yarns 8 can be achieved, for example, by using comb-like means at each end of the laminate structure to be formed. Fiber threads 8 terminating in the sliding bottom have been illustrated very schematically and separated from each other in the drawing, for example in Figures 4, 6, 9 and 10. In reality the number of these fiber threads is rather large, the amount of them in the rod according to Figure 9 can amount to about 10 to 50% by weight. For example, the adhesive layers 7 of the laminate structure may also contain the above-mentioned quantity of fiber yarns.

Claims (3)

457 236 - 10 15 20 25 30 35 PATENT REQUIREMENTS 1. l. Sliding bottom for skis, especially cross-country skis, with front and rear sliding part and Ined a gripping part arranged as the middle part of the sliding bottom, which is provided with sloping synthetic fiber closing the surface of the sliding bottom to provide attachment without the use of wax, characterized by (4) is designed as a laminate structure (5, 10), the laminate layers (6) of which lie next to each other in the sliding surface of the gripping part (4), and that the artificial fibers (8) are arranged between the laminate layers (6). Method for producing the surface of the sliding base of the gripping part of a ski in accordance with claim 1, characterized in that a basic structure (24) of laminate (6) is formed, in which the basic structure (24) the synthetic fibers (8) is laid substantially parallel to each other between the laminates, and that one or more layers to be applied in the sliding bottom are cut from the basic structure obliquely in relation to the man-made fibers (8) so that the man-made fibers (8) are known per se. way ends obliquely in the cut surface, which forms the sliding surface. 3. A method according to claim 2, characterized in that the laminates (6) are made of plastic and that the plastic laminates are heated and compressed into a substantially homogeneous mass. CA