JPS6254027B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to skis, and more particularly to skis with vibration damping devices.

Conventional skis often vibrate and this causes problems, either due to the construction of the ski or the quality of the snow that the skis ski on. Such problems include the creation of noises that are annoying to the skier, the transmission of vibrations to the skier's legs that make the skier uncomfortable, and the creation of drawbacks when skiing. This drawback concerns the grip of the ski on ice or frozen snow, the stability of the ski when going over bumps and when climbing, and the stability of the ski when turning. Furthermore, vibrations significantly limit the free-gliding properties of skis on snow.

In order to avoid these drawbacks, it has already been proposed to include damping elements in the ski body that can absorb or reduce the vibrations of the ski body.

Initial efforts were to provide this damping element along the entire length of the ski. This has been shown to increase skier comfort. However, this does not seem to improve the grip of the ski on ice or frozen snow, nor does it provide much stability during short climbs or turns.

Efforts have also been made to reduce the length of the vibration damping element to the first half of the ski's length, i.e. the area between the spoon point and the stop, but this is only a small amount compared to using a vibration damping element that runs the entire length of the ski. Only benefits can be found.

Thus, although early efforts appeared to solve the problem of skiing comfort by reducing the vibrations transmitted to the skier's legs,
This has not been successful with respect to essential properties when skiing.

The main object of the invention is to provide a ski that eliminates the disadvantages of conventional skis as mentioned above.

Another object of the invention is to improve the comfort when skiing and at the same time improve the properties of the ski, in particular the gripping ability of the ski on ice and frozen snow, the ski when climbing or passing through humps. The object of the present invention is to provide a ski with a vibration damping device that is improved in terms of stability and stability of the ski when turning.

These and other objects of the invention, which will become apparent later, consist in the employment of such members having significantly shorter longitudinally spaced lengths in place of shock damping parts conventionally incorporated in skis. It is based on the surprising discovery of the inventors of this invention that significantly improved results are thus obtained.

According to the invention, therefore, skis are comprised of constrained viscoelastic (prestressed or confined elastomers) longitudinally spaced apart from each other in the ski structure and extending longitudinally within the ski. of)
It has at least two bands or strips of material. The length of each band is 10% of the total ski length.
It should be between 20% and the spacing between the elements can be correspondingly from 10% to 20% of the ski length, but can be as large as 30% of the total ski length.

The number and relative position of these bands serving as damping elements depends on the use of the ski and the characteristics suitable for this use.

For example, it has been found that providing three damping bands, each located in the spoon or tip area of the ski, in the ski stop area, and in the heel or rear area of the ski, is useful for touring or alpine touring skis. This is advantageous for skiing, such as cross-country skiing.

Three bands of this type significantly improve comfort when skiing and also improve the ski's grip on ice or frozen snow, the ski's grip when passing over rises or bumps. The stability and stability of the ski when turning is significantly improved.

Even when skiing over harsh and irregular surfaces,
Vibrations are damped or eliminated and vibrations are significantly eliminated.

Special skis, for example skis designed primarily for downhill skiing and large slalom, are advantageously provided with only two damping bands. One of these bands of constrained viscoelastic material is placed in the area of the spoon or tip of the ski, and the other in the area of the stop.

The above-mentioned and other objects and advantages of the invention will become apparent from the following detailed description taken in conjunction with the drawings.

The internal structure of the ski according to the invention is clearly illustrated in FIGS. 2 and 4. The ski has a metal sheet 1 on its upper side, which is joined to a stiffening layer 2 of glass fiber or fabric embedded in an epoxy resin. The bottom of the ski is formed by a polyethylene strip 6 joined to the metal layer 5 between a pair of metal edge strips 8. Another layer of flexible glass fiber or fabric impregnated with epoxy resin and suitably cured is shown at 4, with layers 2 and 4 being phenolic resin (phenolic resin).
resin) or acrylonitrile-butadiene-
Styrene (ABS or acrylonitrile-butadien)
Together with the side pieces 7 of -styrene resin, they define a space, which is filled with a foamed synthetic resin, for example polyurethane 3.

A damping element in the form of a band 9 is likewise arranged in this space and contains a constrained viscoelastic (prestressed or confined elastomer)
Consists of a band. This band is in tension, e.g. alpha-cyanoacrylate (alpha-cyanoacrylate)
cyanoacrylate) can be stressed in tension or compression, preferably both longitudinally and transversely, before being bonded to layer 4 by means of an adhesive. This can be made of soft rubber. However, in the embodiment shown in FIG. 4, the band 9' is stretched longitudinally but compressed laterally so as to exhibit a light wavy appearance before being bonded to layer 4.

According to the invention, the ski shown in FIG.
0 and 11, which are shown in Figures 2 and 4.
As shown in the figure, the lower portion of the inner core 3 contacts the layer 4 and is preferably bonded thereto. Of course damping elements 9, 10 and 11 (or 15 and 1
6) can be restrained only by the inner core material 3 if desired.

Each of bands 9, 10 and 11 has a length significantly less than the overall length of the ski.

The damping band 9 is thus arranged in the forward part in the area of the spoon 12, i.e. in the area near the front end of the ski, preferably between 10% and 20% of the total length of the ski, i.e. the length of the surface pressed by the ski.
With 15% length.

The damping element 10 is located at the central push of the ski in the area of the stop or intermediate leg support area 13 and has a length between 15% and 25% of the total length of the ski, preferably about 20%.

The rear damping element 11 can be located in the area of the heel 14 of the ski, i.e. in the rear area, and extends over the entire length of the ski.
It has a length of 10% to 20%, preferably about 25%.

In Figure 1 there are 12 spoon areas and 1 stop area.
3.

The ski shown in FIG. 3 is used especially for large slalom and uses only two damping elements 15 and 16.

Damping bands 15 are placed in the area 17 of the spoon while damping bands 16 are placed in the area 18 of the stop, each band having a length of about 25 cm when the ski has a length between 2 m and 2.05 m. have

When the skis are used for big slalom, this has reportedly been found to provide complete stability giving excellent grip laterally when moving through curves and over bumpy, irregular areas. It also has excellent dimensional stability even at high speeds.

Viscoelastic bands 9, 10, 11, in all cases
15 and 16 are constrained or confined in all directions by the inner core material 3, and thus any force applied to the band creates a stress in the band that is resisted to yield by the restoring force.

It has been found that in the configuration shown, the band significantly relieves the transmission of vibrations to the skier's legs.

[Brief explanation of the drawing]

FIG. 1 is a diagrammatic plan view of an embodiment of the ski of the present invention with a portion removed, and FIG.
FIG. 3 is an enlarged sectional view taken along line 2,
FIG. 4 is a sectional view similar to FIG. 1 showing a slalom ski according to an embodiment, and FIG. 4 is a sectional view similar to FIG. 2 showing another embodiment of the present invention. In the drawings, 1 is a metal plate, 2 is a glass-reinforced epoxy resin layer, 3 is an inner core, 4 is a glass-reinforced epoxy resin layer, 5 is a metal plate, 6 is a polyethylene strip, 7 is a synthetic resin side piece, and 8 is a metal edge, 9,10
and 11 indicates the band, 12 the spoon, 13 the stop area, 14 the heel, 15 and 16 the band, 17 the spoon, and 18 the stop area.

Claims (1)

Claims: 1. A ski comprising a vibration damping device contained within the ski structure, the vibration damping device being made of a stressed viscoelastic material, the ski comprising: at least two bands of material, said bands being arranged such that a spacing exists between them and each having a length of 10% to 20% of the total length of the ski, one band 15; ski with a vibration damping device, characterized in that one band 16 is located in an area 17 near the front end of the ski, and another band 16 is located in an intermediate leg support area 18. 2. The ski has three such bands, one band 9 located in the area 12 near the front end of the ski, another band 10 located in the middle leg support area 13, and Another band 11 is
Ski according to claim 1, located in the rear area 14. 3 Said one band 9, another one band 1
0 and one further band 11 from 10% to 20%, 15% to 20% and 10% of the total ski length
Skis according to claim 2, each having a length of . 4. The ski has two bands, one band 15 located in the area 17 near the front end of the ski and another band 16 in the middle area 18. Skis according to scope 1.