A SKI BINDING DEVICE This invention relates to a ski binding. More particularly, it concerns a guide arranged between a ski and a ski boot, which is arranged to transfer, during the relative rotation of the ski and the ski boot, torques about the longitudinal axis of the ski between the ski and the ski boot. The guide is most advantageously arranged at the heel portion of the ski boot.

A conventional ski binding for touring or cross-country purposes includes a toe binding, in which the ski boot is clamped in a known manner. This clamping can be effected by means of, for example, a loop about the heel of the ski boot (for example, Kandahar) or by means of a locking device at the toe binding (for example, Rottefella).

Ski bindings of this kind connect the ski boot to the ski in a less stable manner, as the main portions of the ski boot can be rotated in a relatively great angular deflection about the longitudinal axis of the ski.

In order to connect the ski boot to the ski in a more stable manner, ski bindings have been developed, which lock the ski boot to the ski, as is usual to use when practicing slalom,

for example. Prior art slalom bindings are designed in such a way that the ski boot is releasably attached to the ski at both the toe and heel portions of the ski boot.

During the practicing of different skiing techniques, exemplified here by so-called telemark skiing, it is of great importance for torques about the longitudinal axis of the ski to be transferred in a relatively stable manner between the boot and the ski, while at the same time the ski boot is free to rotate about its toe portion relative to the ski.

Known ski bindings either have insufficient rigidity relative to the transfer of torques about the longitudinal axis of the ski, or they lack the possibility of rotating the ski boot about the toe portion of the ski boot relative to the ski.

The invention has as its object to remedy or reduce at least one of the drawbacks of the prior art.

The object is realized in accordance with the invention through the features specified in the description below and in the following Claims.

According to the invention a ski binding, in which a ski boot is connected at its toe portion to a ski, is characterized in that between the ski and the ski boot there is arranged a guide, which is arranged to transfer torques about the longitudinal axis of the ski between the ski and the ski boot.

It is advantageous that the guide is active at least during part of the relative rotation of the ski boot about its toe portion relative to the ski.

The guide includes a first guide portion and a second guide portion cooperating with the first guide portion, either one being connected to one of the ski or the ski boot.

In a preferred embodiment the first guide portion is formed by a relative to the ski upright, preferably straight guide section, whereas the second guide portion is formed by a claw section, movably gripping the guide section with relatively little clearance. The guide section is most practically arranged on the ski, whereas the claw section is connected to the ski boot.

It has turned out to be favourable to provide the guide with a brake. Thus, between the first guide portion and the second guide portion there may be arranged a brake, which is arranged to brake a movement between the guide portions.

In some conditions vibration may occur between the ski and the binding. To overcome this phenomenon it is possible to arrange between the first guide portion and the second guide portion a damper that is arranged to cushion movement between the guide portions.

The guide according to the invention may be used with advantage together with prior art release bindings.

In what follows is described a non-limiting example of a preferred embodiment which is visualized in the accompanying drawings, in which: Figure 1 shows a ski boot which is mounted on a ski by means of a toe binding, and which is guided at the rear portion of the ski boot by a guide; Figure 2 shows a section Ia-Ia of Figure 1;

Figure 3 shows a section Ib-Ib of Figure 1; Figure 4 shows the same as Figure 1, but here the ski boot has been rotated somewhat about its toe portion, so that the heel of the ski boot has been lifted somewhat from the ski; Figure 5 shows the same as Figure 4, but here the ski boot has been rotated further about its toe portion; Figure 6 shows a guide, which is provided with a damper, the ski boot being disengaged from the damper; Figure 7 shows the same as Figure 6, but here the ski boot is in its position bearing on the ski, in which the damper is compressed; and Figure 8 shows a section VII-VII of Figure 7.

In the drawings the reference numeral 1 denotes a guide, which is arranged between a ski 2 and a ski boot 4. At its toe portion 6, the ski boot 4 is connected to the ski 2 by means of a binding 8 of a design known per se.

In this preferred embodiment the first guide portion of the guide 1 is formed by an essentially upright plate-like guide section 10 connected to the ski by means of a securing element 12.

The second guide portion of the guide 1 is formed by a claw section 14 fixed to the ski boot 4. The claw section 14 movably grips the guide section 10, see Figure 3.

A torque in the ski boot 4 about the longitudinal axis of the ski 2, indicated by the arrow 16 in Figure 2, is transferred

because of the length of the claw section 14 along the guide section 10, via the guide section 10 to the ski 2.

When the ski boot 4 is rotated about its toe portion 6 and thereby is lifted somewhat from the ski 2 at its heel portion 18, the claw section 14 is moved along the guide section 10, see Figure 4. Said torque transfer is active until the ski boot 4 is rotated so much about its toe portion 6 that the claw section 14 loses its engagement with the guide section 10, see Figure 5.

With advantage, the guide 1 may be provided with a brake pad 20, see Figure 2, which is arranged to brake a movement between the guide section 10 and the claw section 14.

In a section in Figure 2 the brake pad 20 is shown in a bore 22 in the claw section 14. A compression spring 24 is pre- tensioned between the claw section 14 and the brake pad 20 in the direction towards the guide section 10.

In an alternative embodiment the guide 1 is provided with a damper 26, see Figures 6,7 and 8. The damper 26 is arranged in such a way that it is active only when the heel portion 18 of the ski boot 4 is close to the ski 2.

In this embodiment the damper 26 is a two-part damper, there being one damper section 28 on either side of the guide section 10. The damper section 28 articulate at their lower portions 30 on the guide section 10. At their upper movable portions 32, see Figure 6, the damper sections 28 are connected by means of an axle 34 extending through an essentially vertically elongate groove 36 in the guide section 10.

The claw section 14 includes a damper stopper 38, which is arranged to bear on the axle 34 when the ski boot 4 is moved down towards the damper 26. In the further movement of the ski boot 4 down towards the ski 2, the damper sections 28 are compressed, see Figures 6 and 7.