DE2655665A1 - SKI AND METHOD OF ITS MANUFACTURING - Google Patents

Description

PAT EN ¹ TA N WA LT B

A. GRÜNECKER

DIPL-ING

H. KlNKELDEY

DR-INGL

W. STOCKMAIR

DR-ING. - A * E (CAUtCH

K. SCHUMANN

DR RER NAT D * R_-PHY &

P. H. JAKOB

DIPL-ING

G. BEZOLD

DR FERNAT- OPL-CHEM.

MUNICH

Dec 8, 1976

PH 11 070

FRANZ KNEISSL SKIFABRIK GESELLSCHAFT Μ, Β, Η.
A-6332 Kufsteirr, Tyrol

Ski and process for its manufacture

709826/0282

The present invention relates to a ski with a core foamed in between the outer layers and a Process for its manufacture.

In the known method for producing such a ski, the top and running surface, as well as Edges and tip protectors in a mold, the cavity of which corresponds to the finished ski, inserted and with foamable Plastic poured out. In order to obtain the appropriate rigidity of the ski, appropriately dimensioned laminates are used used for the running or top surface. There will be aJLso the tensile and compressive forces are absorbed by the outermost layers of the ski, while the actually thick core only as Spacer is used. As mentioned before, the core consists of a foamable plastic. Due to the low modulus of elasticity of the foam core (polyurethane), it is not suitable for absorbing larger bending moments.

This means that the bending stresses are very large on the outer surfaces and on the transition to the core decrease sharply, only to taper off steadily to zero towards the neutral fiber.

The object of the invention is to modify the core in such a way that the stress curve from the outer surfaces to the neutral fiber is approximately linear.

According to the invention, this is achieved in that a random fiber fleece or the like, preferably "endless glass fiber mats", is inserted between the top and tread laminate. An "endless glass fiber mat" has glass threads of endless length that are in a tangled position . The advantage of this material is that the mat is very fluffy, ie there are larger cavities between the individual glass fibers and thus the core, as far as the weight is concerned, is only minimally affected. In addition, the relatively large cavities allow substantially unimpeded propagation of the introduced foaming plastic "The random orientation of the glass fibers be further effect in that the core in all 3 dimensions, ie spatially is enhanced. The core and the ski is both more rigid and stable page. If you wanted the same

709826/02 82

Stiffness with the commercially available fiberglass laminates or " metallic ski components, then this would be with significantly higher costs associated »

Instead of the discussed "endless glass fiber mats" Any materials known or suitable for the reinforcement of plastic foams can be used, as long as they are similar to a random fiber fleece in terms of their structure, i.e. fibers oriented in at least 2 directions or Have threads.

DT-OS 24 44 905 describes a method with a corrugated cardboard body between the upper and lower surface is inserted. This corrugated cardboard body has the The task of keeping the upper and lower ski components at a distance from one another that corresponds to the desired ski shape. That this corrugated cardboard body only serves to keep a distance is possible from DT-OS 24 44 905 page 6, paragraph 1 clearly emerges.

The DT-AS 2 233 3o7 shows how the problem of

Connection of foam core and outer ski components is released. There it is about the top covering as well as the bottom covering Fibers or a fiber material zi provided that is perpendicular to stick out from the coverings and are fixed to the foam core when foaming. This creates a particularly intimate connection the load-bearing top layer guaranteed. These fibers are normal, i.e. at 90 ° to the load-bearing ski components. As a result, these fibers can only be used to hold the outer coverings in place. Tensile and compressive forces in the outer zones of the ski occur when bending can not be absorbed by the fibers will.

The invention will now be explained in more detail with reference to the drawing, but without being restricted thereto.

Fig, I shows a ski according to the invention partially cut, Fig. 2 shows the «insert part from a "Endless fiberglass mat" ·

The tread 5 with the tread laminate 6 and the steel edges 7 are inserted into the mold. One of the shape of the core is now essentially applied to these lower ski components corresponding "endless glass fiber mat" 3 laid. The ski top 1 is pre-milled so that it fits the waist of the

709826/0282

Skis received and then also inserted into the mold. After all the ski components have been placed in the mold ₈ , it is closed and filled with a foamable plastic, which is initially liquid ο The liquid plastic wets the single glass fibers of the “endless glass fiber rat” and, when foamed, creates an intimate connection “D © r manufactured in this way® ski has a significantly higher strength than skis with an alehfc-reinforced foamed core «,

709 826/02

Empty soap

Claims (1)

14 497 / R FRANZ KNEISSL SKIPABRIK GESELLSCHAFT M. » _# H. IN KUFSTEBi (TYROL) Patent claims: lJ skis with foamed between the outer surfaces Core, characterized in that the foamed core is covered with a random fiber fleece over the entire cross section is armored 2 _# ski according to claim 1, characterized in that the reinforcement material is an "endless glass fiber mat". 3. Process for the production of a ski according to Claims 1 and 2, in which the deck "and the running surface, Tread laminate, as well as edges and tip protectors in one Mold are inserted and the cavity is filled or injected with foamable plastic, characterized in that that in the cavity before the introduction of the foamable plastic, essentially filling this space Random fiber fleece is inserted » ORDINAL INSPECTED V09826 / 0282