DE7333314U - Cross-country skis - Google Patents

Description

Patent attorney Dr. Lothar Marx

. ■ ■ ■: Dipl.-Phys.

Am Brombeerschlag 8000 Munich 70
Telephone 089 713813

3 i. March 1977i

Munich,

Attorney File 5701
G 73 33 314.9

Jochen Plenk KG
Ski workshops and

Josef Eder
Ruhpolding

/ Cross-country skiing

The innovation concerns a cross-country ski in the preamble of the claim 1 specified genus.

About the annoying and only flawless with a certain amount of experience
You have to avoid waxing cross-country skis
recently developed cross-country skis with a profiled synthetic surface. The various profiles already proposed contain projections or depressions in the plane of the covering which, on the one hand, ensure good sliding in the forward direction, while on the other hand are intended to prevent the ski from sliding back.

Tl OO OO Ί / λ λ An mm Deutsch · Bank Munich 57/41111

Γ 3 ü J 0 I ty Zl. 07. 77 Pottictiackkonto MQndwn 154 221403

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

The production of the profile in an embossing process is proportionate expensive. In addition, the E properties of the synthetic surface generally adversely affected by the heating of the covering necessary for the embossing. B. in many cases as a result Tensions in the plastic). Another 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 when costly reworking should be avoided.

The innovation is therefore based on the task of developing a cross-country ski of the specified type while avoiding this deficiency, which is characterized by a particularly simple, cost-saving setting and has good sliding and adhesive properties.

This task is renewed according to the characterizing part of the claim 1 specified features solved.

In the case of the cross-country ski according to the invention, the profiling is thus not produced in an embossing, pressing, injection molding or extrusion process, but by subsequent machining of the coating made of the thermosetting plastic that has already been applied to the base body. This eliminates the need to protect the profiling from damage and soiling while the plastic coating is being applied to the ski body. It also opens up the possibility of producing the profiling in the cold state of the covering, ie, approximately at room temperature. Since the plastic of the covering no longer has to be heated to produce the profiling, its properties are not

more impaired; the synthetic surface retains the high-quality properties corresponding to the selected plastic material.

Only because there was no subsequent plastic deformation it is possible to select a very hard plastic, namely a thermosetting plastic.

The sharp ones resulting from the cutting of the indentations Edges lead to excellent adhesive properties (protection against sliding back of the ski), but without the good sliding properties to affect. As tests have shown, make the sharp longitudinal edges of the recesses, if they are arranged in the longitudinal direction of the ski, at the same time an excellent ski guide, so that a Track groove may be omitted.

Another advantage of the cross-country ski according to the innovation is the possibility of simply regrinding (plane grinding) of the Surface to make the edges of the depressions, which may have been slightly rounded off by using them, sharp-edged again - an advantage, which none of the previously known cross-country skis with a plastic surface profiled by embossing has.

And finally, the renewal contemporary cross-country skiing is distinguished in comparison with known designs by a lower wear of the profiling and by avoiding the disturbing whistling sound when ^T, aufen out.

Expedient configurations of cross-country skis result from the innovation from the subclaims.

An embodiment of a cross-country ski according to the innovation is intended will be explained in more detail below with reference to the accompanying schematic drawings.

Show it:

1 shows a partial view of a cross-country ski according to the innovation (from below);

FIG. 2 shows a section along the line H-II of FIG. 1; and

3 and 4 SchematicstelJung to explain the Production of the profiling.

The cross-country ski 1 shown consists of a base body 2 (its Details are not of further interest here) and a plastic covering 3 which forms the tread and which has a profiling on its underside which is formed by a large number of sharp-edged depressions 4. In addition, the plastic covering 3 can also have a medium Have track groove 5.

The recesses 4 go, at the rear end (direction of the ski marked by arrows 6) into the plane 7 of the covering 3, gradually deeper towards the front end (see. Fig. 2), are on its two sides through edges 8a, 8b running approximately parallel to one another and in the longitudinal direction of the ski and at the front end an edge 9 running in the transverse direction of the ski is 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 recesses 4 can of course be varied within wide limits within the scope of the innovation.

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

First, the main body 2 of the ski with the not yet profiled, essentially smooth (possibly only one groove 5 with

7131114 UH.Tr

send) plastic covering 3 provided. Then cut in a first Operation (Fig. 3) knife 10 obliquely to the level 7 of the base in the base, for example, the ski 1 is stationary and move the measuring device 10 in the direction of arrow 11. On this first one This work step thus results in upstanding chips 12 in the area of the attack points of the knives 10.

In a second step (Fig. 4) these are then raised Chips 12 by knife 13, which are essentially in plane 7 of the covering act, cut off at the front end of the depressions 4. For this purpose, the knives 13 can, for example, stand still and the ski 1 move back in the direction of arrow 14 (of course, the reverse mode of operation is also possible).

- Protection claims -

7333314 07/21/77

Claims (4)

Josef Eder Ruhpolding '^ G 73 33 314.9 Lawyer files 5701 New claims for protection 1. Existing from a base body with a plastic covering Cross-country skis, in the running surface of which depressions are cut as a safeguard against sliding back, thereby ge kennreichnet that in the unprofiled, essentially smooth covering (3) made of a thermosetting plastic sharp-edged Wells (4) are cut. 2. Cross-country ski according to claim 1, characterized in that the Recesses (4) at the rear end in the plane (7) of the covering (3) go over, gradually getting deeper towards the front end, at their both sides by edges (8a, 8b) running approximately parallel to one another and in the longitudinal direction of the cross-country ski and at the front end are limited by an edge (9) running in the transverse direction of the ski. 3. Cross-country ski according to one of claims 1 or 2, characterized in that ' that in the transverse direction of the cross-country ski neighboring Vertie ~ Fungen (z. B. 4a, 4b) are offset from one another in the longitudinal direction. 7333314 2 1 fi? 77 German «Bank Munich 57/41111 Postacheckkonto Munich 154221-KB 'II ' ■ , I. III) ',' ir 4. Cross-country ski according to one of claims 1 or 2, characterized in that adjacent depressions approximately in the transverse direction of the ski lie on a common line running in transverse direction. 7333314 21.97.77