DE2346235A1 - Cross country ski production method - fitted with a profiled plastic coating to prevent sliding back - Google Patents

Abstract

Production method for a cross country ski with a plastic coating fitted with a profile as a safety measure to prevent sliding back of the ski. The ski is first of all fitted with the coating in smooth condition and the profile in the form of sharp-edged recesses is subsequently cut into the coating using knives, with the temperature at toom level. The cutting of the profile is carried out in two stages, with a first group of knives cutting into the coating obliquely to its surface during the first stage, whilst a second group of knives cut off the wood shavings formed at the front end of the recesses during the second stage. during the second stage.

Description

Pk 2574

Jochen Plenk, Ruhpolding

Method of making a cross-country ski

The invention relates to a method for producing a cross-country ski with a plastic coating that has a profile has as a safeguard against sliding back of the ski.

The invention also relates to a cross-country ski produced by this method.

About the annoying and only flawless with a certain amount of experience To avoid the waxing of cross-country skis, one has recently had cross-country skis with a profiled one Plastic surface developed. The various profiles already proposed are included in the plane of the covering Vorsprüntre or depressions, on the one hand a Ensure good sliding in the forward direction, sliding back of the ski, on the other hand, should prevent it.

The production of these cross-country skis has so far been carried out in such a way that the correspondingly profiled plastic casing is first applied is made by embossing the profiling while heating the covering, before then the profiled plastic coating applied to the ski body will. However, this method has significant disadvantages.

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The production of the profile in an embossing process is relatively expensive. In addition, the properties of the plastic covering are determined by those for the embossing The necessary heating of the covering is generally adversely affected (e.g. tensions often arise as a result of this in the plastic). A further disadvantage is that in the known method of the profiled plastic covering during the application to the ski body must be well protected against damage and soiling, if costly Rework should be avoided.

The invention is therefore based on the object of avoiding these shortcomings of the known embossing process To develop a new process for the production of a cross-country ski, which is characterized by a particularly simple, cost-saving Production excels and makes it a particularly / high-quality cross-country ski with good glide and grip properties leads.

This object is achieved according to the invention in that initially the ski with the not yet profiled, essentially smooth covering and then the profiling in the form of sharp-edged depressions, with the help of "eaters" is cut into the pavement.

In the method according to the invention, the scmit Profiling is not produced in an embossing, pressing, injection or extrusion process, but through subsequent processes machining of the plastic coating already applied to the ski body. This does not apply to the Necessity - the profiling during application the plastic coating on the ski body from damage and protect pollution. It continues to open the

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Possibility of making the profiling in the cold Condition of the covering, i.e. at around room temperature. Because the plastic of the covering is used to manufacture the profiling no longer has to be heated no longer affects its properties; the synthetic surface In this way, it retains the properties of the selected plastic material corresponding, high-quality properties.

It is also of particular advantage in the method according to the invention that, in view of the omission of a subsequent plastic deformation a very hard, for example a thermosetting plastic can be selected.

The sharp edges resulting from the cutting of the depressions in the method according to the invention lead to excellent adhesive properties (protection against sliding back of the ski), but without the good sliding properties to affect. As tests have shown, the sharp long edges of the depressions make when they be arranged in the longitudinal direction of the ski, at the same time an excellent ski guide, so that a ruts may be. can come in failure.

Another great advantage of the cross-country ski produced by the method according to the invention consists in the possibility of simply regrinding (surface grinding) of the covering which may have been slightly rounded off by use To make the edges of the depressions sharp-edged again - a benefit that none of the previously known cross-country skis have with a plastic covering profiled by embossing -.

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The one produced by the method according to the invention Finally, cross-country skis are characterized by less wear on the profiling compared to known designs; and by avoiding: the annoying whistling noise at Run out of.

Further refinements of the invention emerge from the subclaims.

An embodiment of the invention is illustrated in the drawing. Show it

1 shows a partial view of the cross-country ski produced by the method according to the invention (from underneath);

FIG. 2 shows a section along the line II-II in FIG. 1; FIG.

FIGS. 3 and ¹ J schematic diagrams for explaining the manufacture of the profiling.

The cross-country ski 1 shown consists of a base body 2 (the details of which are not of further interest here) and a plastic coating 3 which forms the running surface and which has a profile on its underside which is formed by a large number of sharp-edged depressions U. In addition, the plastic covering 3 can also have a central track groove 5.

At the rear end (direction of the ski indicated by arrows 6) the depressions ¹ J merge into the plane 7 of the base 3, become gradually deeper towards the front end (see FIG. 2) and are approximately parallel on both sides

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Edges 8a, 8b extending to each other and in the longitudinal direction of the ski and at the front end by one in the transverse direction of the ski running edge 9 limited.

Recesses (e.g. 4a, 4b) that are adjacent in the transverse direction of the ski are offset from one another in the longitudinal direction.

The number, size and arrangement of the depressions 4 can of course within wide limits within the scope of the invention can be varied.

The manufacture of the cross-country ski is shown in FIGS. 3 and 4 shown.

The base body 2 of the ski with the not yet profiled, essentially smooth (possibly only one Provided with groove 5) plastic covering 3. then cut in a first step (Fig. 3) knife 10 obliquely to the plane 7 of the covering in the covering, for example the ski 1 is stationary and the knives 10 move in the direction of arrow 11. At this first job grade This results in upstanding chips 12 in the area of the attack points of the knives 10.

In a second operation (Fig. 4) these thrown chips 12 are then by knife 13, which essentially act in the plane 7 of the covering, cut off at the front end of the depressions 4. For this purpose, for example the knives 13 stand still and the ski 1 move back in the direction of arrow 14 (of course 1st auph reverse operation is not possible).

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Claims (6)

Claims 1J process for producing a cross-country-ski with a: synthetic surface having a profile as a protection against sliding back of the ski j characterized in that first the ski is not profiled with the provided substantially smooth covering and then the profiling in ^p orr . cut into the pavement from sharp-edged depressions with the help of knives. 2. The method according to claim 1, characterized in that the cutting of the profiling at about room temperature of the covering takes place. 3. The method according to claim 1, characterized in that the cutting of the profiling in the surface in two Operations takes place, with a first group of knives at an angle to the level of the covering in the first operation the covering engages and in the second step a second Group of knives cut off the chips formed at the front end of the depressions. 4. Cross-country skiing, manufactured according to the method of claim 1, characterized in that the recesses ⁽¹ O pass over the rear end in the plane (7) of the covering (3) are gradually deeper toward the front end, at both Sides are bounded by edges (8a, 8b) running approximately parallel to one another and in the longitudinal direction of the ski and at the front end by an edge (9) running in the transverse direction of the ski. 5. Ski according to claim 4, characterized in that in the transverse direction Depressions adjacent to the ski (e.g. 4a, ^ b) are offset from one another in the longitudinal direction. 509813/0547 6. Ski according to claim 4, characterized in that in Depressions adjacent to the transverse direction of the ski, for example, on a common one extending in the transverse direction Line lie. 509813/0547 • f. Blank page