DE1954075A1 - Profiled treads for gliding and climbing skis - Google Patents

Description

FARBWERKE HOECHST AG. formerly Master Lucius & Brüning File number: Fw 6244 Gm 918

Date: October 27, 1969 Dr.Za/Ku

"Profiled running surfaces for gliding and climbing skis".

Running surfaces of gliding and climbing skis, in particular of Cross-country skis, in addition to good gliding properties, also have to be a have good climbing ability. These opposing properties have so far been achieved by applying several special wax layers on a continuously flat running surface. Correct waxing requires a high level of experience and involves considerable labor, time and ■ costs tied together. Prove how great the risk of incorrect growth is even with experienced top athletes the sometimes very high failure rates in cross-country competitions, Running surfaces that keep their excellent gliding properties in a wide variety of snow types without waxing thus also a real basis for evaluation in competitive sport.

Attempts have already been made to increase the grip of the running surface by suitable profiling, in particular by Making Step or Sawtooth Notches · These notches are temporarily pressed into the snow cover by the body weight when climbing and thus prevent sliding backwards on sloping snow surfaces (so-called resistance principle).

According to German patent specification 1.033 · 56? the Profiling of the outsole (and the ski edges) from round notches * with a slightly convex or flat run-out surface to the rear, where in each case directly in the cutting line, the run-out area the next round notch with the geometric ski running surface begins (so-called Sagezahnprof.il). »

109819/0083

The running surface can be provided with round notches throughout, but it is also possible to group the round notches and summarize them on the front, middle and To distribute Hinterski. .

• Due to the special design and nature of the tread notch an effective engagement of the sharp notch edges should also be achieved in smooth, stuck snow with good downhill properties at the same time.

Profiles of the type described above can, however, due to the unsatisfactory gliding behavior when running, the demands placed on cross-country skis in particular are not satisfactory fulfill.

The same also applies to the profile soles according to the German Patent specification I.O59.327. "

In this case, too, both the surface and the steel edges are notched. as regards notch depth, notch spacing, etc., certain geometric conditions must be met. · The aim of this complicated profiling is primarily an improvement of the exit properties, whereby the notches serve the purpose have to tear off the water film that forms under the running surface and thus the suction effect that otherwise occurs to zoom out.

The main disadvantage of these profile soles is the considerable manufacturing effort.

It has now been found that the disadvantages mentioned above can be avoided can if you divide the ski outsole in step groups and divides flat sliding surfaces with the step group with the largest step width and possibly the greatest step depth is below the tread.

This tread profile is based on the idea of Maintaining good sliding properties as many levels as possible Retain sections and only steps suitable for the power transmission at the points on the skis to incorporate.

The number of step groups is expediently between. 3 and 7 »depending on the number and size of the steps; accordingly the number of flat sliding surfaces lying in between is 2 to 6. ■.

In principle, it is possible to lower or lower these limits exceed, but then either the climbing properties or the sliding behavior can be reduced accordingly.

The step depth is generally between 0.5 and 3 preferably between 0.8 to 2.3 now and in particular between 1.5 to, '2, O times.

Under certain circumstances it can be beneficial - if the step depth of the group of steps immediately below the tread is on the is the greatest, especially if a rubber sole is used, whose thickness increases towards the middle of the ski.

In principle, even greater step depths than 3 are now conceivable, the upper limit being determined by the thickness of the plastic covering. In most cases, however, bring it down Step depths of over 3 tmn do not significantly improve the Climbing properties more. '. .

The individual stages of the respective stage group run preferably transversely to the longitudinal axis of the ski and can have differently shaped cross-sections.

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A preferred embodiment is the step profile shown in FIGS. 3 and k. These are steps which are inclined towards the front, ie in the direction of travel, the inclination preferably being l / k to "} / k of the step width.

Another preferred embodiment is shown in Figure 5; the outlet surface leading from the bottom of the step to the next step edge is slightly convex and, before reaching the next step edge, goes into a flat sliding surface part over j the length of which can vary in length depending on the step width, step depth, etc.; Expediently, this flat sliding surface part is l / k to 1/2 of the step width.

The step width is understood to mean the distance from one step edge to the next step edge, that is to say the sum of the length of the flat (unmachined) and the chamfered part.

The step size is variable; it is expediently in the range from 1 to 10 cm, preferably between 2 and 6 cm. Towards the middle of the ski, according to the invention, the step width and preferably also the length of the step groups increase.

To avoid vibration phenomena, it can be advantageous to increase the step size alternately within a group change roughly in the way: 8 cm, 9 cm, 8 cm, 9 em etc.

Under certain circumstances it is also advisable to divide the group of steps under the tread into two different sections To divide the increment, roughly in such a way that it is used for Ski tip located partial steps with, for example, 5 cm Contains a step width and is followed immediately by a second section with, for example, a 3 cm step width.

Like the length of the individual steps, so is the length of the entire group of stages variable and can be within certain Limits vary, but usually the length is 8 to 50 cm, depending on the length and the hardness of the ski

109819/0083

Preferential use of the ski (touring skis, cross-country skis for racing purposes). The step group preferably has below the greatest length of the tread.

Appropriately, the inventive climbing and Gliding ski a guide groove running in the longitudinal direction of the ski; it preferably extends over the entire length of the ski. But it is also possible to only use this guide groove in the planes Incorporate sliding surface parts.

All conventional ski base plastics can be used for the outsole be used, such as low-pressure polyethylene. Particularly favorable results are obtained when using of polytetrafluoroethylene due to its pronounced anti-adhesive properties achieved.

'I.

The profiled soles according to the invention are produced preferably by metal-cutting deformation, in particular milling. But it is also possible through the step groups non-cutting deformation, in particular by pressing into the outsole to incorporate.

In both cases one can proceed in such a way that the The step groups are incorporated into the insulated outsole, which is subsequently glued to the ski. Preferably but the unprocessed outsole is glued on first and then the profiling carried out.

Especially when using profile soles made of polytetrafluoroethylene In some cases it is an advantage to first coat one side of the covering foil with a second layer of another Material, e.g. polyethylene, and the resulting two-layer outsole either in unprocessed Form or already provided with a profile to be glued to the ski sole.

109819/0083

Those provided with the outsole profiled according to the invention Especially when using polytetrafluoroethylene as a covering material, skis are good even without laborious waxing Sliding and climbing properties, preferably when wet and moist types of snow. Adhesion to the snow surface can also be improved by using a suitable running technique will; a dynamic and explosive kick is advantageous.

Compared to those from the German patent specifications No. 1.033 * 567 and 1,059,327 known profile running surfaces has the inventive In addition to the better sliding properties, there are also advantages in terms of manufacturing technology.

Except for cross-country skis, the designated tread profiles can be used can also be used advantageously for other special skis. In addition to touring skis, this also includes special skis for beginners and less fit runners (increased stability).

Possible embodiments of the tread according to the invention

design are shown in Figures 1 to h , without the subject of the invention being restricted to it:

Figure 1 shows the running surface (l) of a ski with five step groups (2), which are arranged perpendicular to the guide groove (3).

Figure 2 shows the same ski in side view. (K) means the ski, (5) the binding.

FIGS. 3 and h show the part of the tread located within the circle according to FIG. 2 on a larger scale, namely according to FIG. 3 in the bottom view and 4 in section.

With a) the length of the sliding surface is referred to;

b) means the bevel, c) the step width and d) the Step depth.

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FIG. 5 illustrates a possible variant of the one shown in FIG shown profile.

To explain the profiling according to the invention, the following step characteristics are also given:

Example 1 /

Step group Steps - bevel, number of steps wide depth

1. End of the ski ^ 6th 2. cm 1 cm 1.8 well 2. (0-12 cm) ¹ '
Medium ski 13th 2 cm 1 cm 1.8 * mm rump 3. (27-51 cm)
Ski center 9 5 cm 3 cm 1.8 mm k. (70-110 cm)
Middle ski 12th 2 cm 1 cm 1.8 mm front part 5. (126-150 cm)
Ski tip
(162-170 cm) 2 cm 1 cm 1.8 mm

measured from the end of the ski to the tip of the ski. Ski length; 210 cm '-

Step cross-section: according to Figure 3
Covering; Polytetrafluoroethylene

109819/0083

Example 2

Level group

Step step width number bevel step depth

1. End of the ski

2 cm (1.9 / 2.1 cm) 1 cm 1.8 mm

2. Center of the rear part of the ski 3 cm (2.9 / 3.1 cm) 2 cm / 1.8 mm

3a. Ski center part at the back

3 cm (2.9 / 3.1 cm) 2 cm 1.8 mm

3b. Ski center part in front

5 era (4.9 / 5.1 cm) 3 cm 1.8 mm

4. Center front of ski 8 3 cm (2.9 / 3.1 cm) 2 cm 1.8 mm part

5 ski tip

2 cm (1.9 / 2.1 cm) 1 cm 1.8 mm

Ski length, step cross-section and surface as with 1,

1Qdd19 / 0Q83-

Claims (1)

- 9 claims: 1.) Gliding and climbing skis with plastic treads, characterized in that in the flat tread profile several step groups are incorporated, with the under Group of steps lying on the tread surface with the largest step width and, if necessary, largest step depth consists. - 2. Gliding and climbing skis according to claim 1, characterized in that the individual steps have a cross-section have a straight or curved course. 3 «gliding and climbing skis according to claims 1 and 2, thereby characterized in that polytetrafluoroethylene is used for the outsole. k. Gliding and climbing skis according to Claims 1 to 31, characterized in that the outsole has 3-7 step groups and 2-6 has flat sliding surfaces in between. 5 · Gliding and climbing skis according to claims 1 to k, characterized in that the step groups are each 8 - 50 cm long. 6. gliding and climbing skis according to claims 1 to 5, characterized marked j that the length of the step groups to the center increases towards. 7. gliding and climbing skis according to claims 1 to 6, characterized characterized in that the step width is 2 - 6 cm. 8. gliding and climbing skis according to claims 1 to 7, characterized in that the bevel l / h to 3 / ^z ± the
Step width is. / ο Blank page