Roller ski

Abstract

The invention relates to a roller ski which is employed amongst other things for training in classic cross-country skiing during the summer. The object of this roller ski is to achieve a pressure-dependent grip when a kick is generated, with the result that more pressure on the ski from the foot provides better grip. This is in order to simulate skiing on snow, where in classic style pressure has to be placed on the ski during the kick in order to obtain grip on the middle of the ski. The invention is based on a common principle. Roller systems with free roll both forwards and backwards are combined with roller systems with one-way roll, in such a manner that when the pressure on the roller ski from the skier increases, the roller system(s) with one-way roll will be activated to an increasing extent as the pressure on the ski increases, with the result that the ski obtains grip thereby enabling a kick to be generated. The grip is obtained without any risk of the ski jerking in the event of unexpected pressure from a rough surface. Without extra pressure the roller ski will be liable to back-sliding just like a classic cross-country ski with grip wax under the middle and glide wax at the front and rear.

1 .- 14 . (canceled) 
     
     
         15 . A roller ski with a central portion where the shoe is attached to the profile connecting the wheels,
 where the different wheels are so designed that when the roller ski is without pressure it will roll fairly freely both ways, and when pressure is applied to the roller ski, the rearward roll resistance will increase with increasing pressure from the roller ski against the surface, this being accomplished by a pressure-dependent brake locking the rearward roll direction, while the forward roll direction continues to roll with little or no braking when the roller ski is subjected to pressure, wherein pressure-dependent resistance against rearward roll is achieved by combining two roller systems, where a first roller system has free forward roll and resistance to rearward roll, the first roller system comprising a brake element and one or more springs arranged in a glider pocket, and a second roller system has free roll both ways, the second roller system comprising a wheel an axle and auxiliary wheel or cylinder arranged on the axle, the first and second roller systems being arranged in such a manner relative to each other that without pressure on the roller ski, the second roller system is active, but as the pressure increases, the relative influence of the first roller system also increases since the second roller system is braked when pressure on the roller ski increases.   
     
     
         16 . A roller ski according to  claim 15 ,
 wherein when the foot presses on the profile under the shoe, the pressure will be transferred to the first and second roller systems, with the result that when pressure is applied to the roller ski, the second roller system will be moved upwards relative to the first roller system providing one-way roll, so that increased pressure on the roller ski engages the first roller system, thereby providing pressure-dependent grip when a kick is implemented.   
     
     
         17 . A roller ski according to  claim 15 ,
 wherein the roller ski at all times has only  2  wheels against the surface, one wheel in front of the shoe and one wheel behind the shoe.   
     
     
         18 . A roller ski according to  claim 15 ,
 wherein pressure-dependent resistance against rearward roll is achieved by an axle which rolls freely both ways being equipped with one-way ratchets, with the result that when this axle is pressed against a brake consisting of oppositely-directed ratchets, the axle is locked and thereby the wheel in a rearward direction of rotation, while the wheel rolls forwards with only a slight braking effect in this direction, even when the pressure on the ski is so great that there is little or no rearward rotation.   
     
     
         19 . A roller ski according to  claim 15 ,
 wherein the axle is equipped with one or more cylinders with a larger radius than the axle, and braking surface or ratchets are placed on the cylinder, with the result that the braking surface is greater than only the axle, and opposite brakes are adapted to the cylinder.   
     
     
         20 . A roller ski according to  claim 15 ,
 wherein the wheel is suspended in an axle which rolls freely both ways, where this axle is braked by a brake device which transfers pressure on the ski to the brake via, e.g. a wire, and the wheel is mounted relative to its axle with a backward stop, thereby enabling the wheel to always roll freely forwards, but to be successively more prevented from rotating backwards in this system with increasing pressure on the ski.   
     
     
         21 . A roller ski according to  claim 15 ,
 wherein the wheel is suspended in an axle which rolls freely both ways, where this axle is spring-suspended so that the axle's rotation will be checked when it is pressed up against a fixed brake, and the wheel is mounted relative to its axle with a backward stop, thereby enabling the wheel to always roll forwards, but to be successively more prevented from rotating backwards in this system with increasing pressure on the ski.   
     
     
         22 . A roller ski according to  claim 15 ,
 wherein a wheel is securely suspended in the profile and that the wheel contains an integrated roller system with spring-suspended axle which without pressure rolls freely both ways, with the result that the axle's rotation will be checked when the axle or an auxiliary wheel is pressed up against a fixed brake, so that one-way rotation takes over.   
     
     
         23 . A roller ski according to  claim 15 ,
 wherein a wheel which rolls freely both ways is spring-suspended so that when pressure is applied it is pressed up towards an overlying wheel which has one-way roll, with the result that when pressure is increased, the overlying wheel brakes the wheel's rearward roll, but provides free forward roll regardless of pressure.   
     
     
         24 . A roller ski according to  claim 15 ,
 wherein the pressure required for braking the freely-rolling axle is transferred hydraulically or pneumatically to a brake device.   
     
     
         25 . A roller ski according to  claim 15 ,
 wherein pressure-dependent resistance against rearward roll is assigned to the front wheel instead of the rear wheel.   
     
     
         26 . A roller ski according to  claim 15 ,
 wherein it further comprises an adjustable, non-pressure-dependent roll resistance.