The present invention relates to a device at a ski carried by wheels or rolls and intended for use on a snow-less support, which device is intended to prevent the ski from rolling or sliding backwards ^" .

To make this kind of skiing possible on a slippery support the ski has to be so constructed, that the ski is prevented from sliding backwards on the support if the support consists of ice, snow or another slippery support.

Up to now no efficient devices preventing such sliding backwards have been suggested. It is true that freewheel couplings are arranged in skis carried by wheels, but these couplings do not prevent the wheel from sliding backwards, when the support is slippery. Typically, these freewheel couplings are combined with oneor more wheel hubs, and they are extremely sensitive to external influence such as that from ice, salt or gravel , which finds its way into the freewheel mechanism and easily causes malfunction thereof.

The primary object of the invention is to provide a device which positively prevents the ski from sliding backwards also when the ski is used onto a slippery sup¬ port.

Additional objects and advantages of the invention in part will be set forth in the description which fol¬ lows and in part will be obvious from the description, or may be learnt by practice of the invention.

To achieve the foregoing objects and in accordance with the purpose of the invention, as embodied and broad¬ ly described herein,, the device at a ski carried by wheels or rolls of this invention comprises a resilient pendulum body attached to the ski behind at least one

wheel or roll carrying the ski, said pendulum body being arranged to contact the support and to engage between the wheel or. roll and the support at initial backward movement of the ski thereby preventing further movement of the ski in the backward direction.

Preferably the end portion of the pendulum body, adjacent the support forms an enlarged section.

It is also preferred that a transition section join- i ng the enlarged section of the pendulum body has a radius of curvature substantially equal to the radius of the associated wheel or roll.

It is also preferred that the enlarged section of the pendulum body is provided with friction increasing means. It is also preferred that said friction increasing means comprise one or more pegs.

The accompanying drawing, which is incorporated in and constitutes a part of this specification,, illust¬ rates one embodiment of the invention and, together with the description, serves to explain the principles of the invention.

The figure in the drawing is a fragmentary side view of a ski carried by wheels and.equipped with a de¬ vice according to the teachings of the invention. Referring now to the drawing there is showη there¬ in a ski 1 having a wheel 2 behind which the device according to the present invention is arranged. The for- ward moving direction of the ski is indicated by the arrow A. The device according to the invention comprises a pendulum body 3, which is attached at 5 to the lower side of the ski by fastening means 6. The solid lines in the figure show the body 3 in a non-actuated position, that is when the ski does not contact the support 10 (position a). The pendulum body 3 is made of a resilient

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material and an enlarged end portion 7 of the body 3 can reach the support 10 when the ski is being used. The po¬ sition of the body 3 at forward movement of the ski 1 in the direction of the arrow A is indicated by dash and dot lines (position b). When the" ski 1 slides back¬ wards over the support 10, the body 3 is moved to a po¬ sition where the e ^* nd portion 7 of the body is jammed between the support 10 and the wheel 2 as shown by dashed lines (position c). A positive braking of the backward movement of ^* the ski is obtained thereby, as the front part 8 of the enlarged portion 7 will jam bet¬ ween the wheel 2 and the support. To further increase the backward braking effect of the device it is prefer¬ red that friction increasing means 11 are arranged at the rear part 9 of the enlarged portion 7 of the body 3.

The position for attaching the body 3 to the ski 1 may be adjustably arranged by using removable washers 4 between the body and the ski. This adjustment of the position of the body in relation to the support should be used to obtain a correct ski-training when this kind of ski is being used. Thus, in order to obtain a correct ski-training when going up-hills it is very important that a force directed downwards is applied to the span of the ski. Normally an adhering coating is provided un¬ der said span on conventional skis. By arranging the bo¬ dy at some distance above the support, it is necessary to depress the span of the ski to enable the enlarged portion 7 of the body 3 to contact the ground and there¬ by provide a braking effect on the ski, counteracting backward movement thereof. When the enlarged portion 7 of the body engages between the wheel 2 and the support 10, the braking effect will be maintained even if the pressure on the span of the ski decreases.

Thus, the braking effect obtained by the device ac¬ cording to the present invention is produced in part by

preventing the wheel from rolling backwards when con¬ tacting the device 3 which is clamped against the sup¬ port 10, and in part by preventing the wheel 2 from sliding backwards due to the increased friction between the support 10 on one side and the wheel 2 and the de¬ vice 3 on the other side. On an icy support the fric¬ tion increasing means 11 are used to positively grip into the support when the ski tends to slide backwards e.g. when the wheel 2 is locked by the device. - The device according to the present invention is not necessarily arranged together with a load-carrying wheel ; a similar braking effect on fender wheels ar¬ ranged at the front and/or the back edge of the ski may be obtained by the device as previously described re- garding a load-carrying wheel .

The device according to the present invention may have a width corresponding to the width of the ski or the width of the wheel. It is also possible to divide the device into serveral independently pivoted bodies, or the device may comprise a single body only co-operat¬ ing with a limited part of the width of the wheel.

It will be apparent to those skilled in the art that various other modifications and variations in ad¬ dition to those mentioned above could be made in the de- vice of the invention without departing from the scope and spirit of the invention.

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