Rolling sports equipment

Abstract

In a roller sport device, particularly a single-track skateboard or a single-track roller skate, having two roller axles disposed one behind the other with single-track rollers which run one behind the other and which are disposed thereon, which axles are disposed on a board or on a supporting frame, the rearmost of the two roller axles (rear axle) can swivel about an axle (steering axle) which points obliquely downwards and forwards and which forms a trailing angle. The running faces of the rollers are curved transversely to the direction of travel and have a high coefficient of friction similar to that of rubber.

1 . A roller sport device, particularly a single-track skateboard or single-track roller skate, having two roller axles disposed one behind the other with single-track rollers which run one behind the other and which are disposed thereon, which axles are disposed on a board or on a supporting frame, characterised in that the rearmost of the two roller axles (rear axle) can swivel about an axle ( 3 ,  21 ,  25 ,  32 ,  34 ,  41 ,  71 ) (steering axle) which points obliquely downwards and forwards and which forms a trailing angle, that the running faces ( 7 ′,  12 ′) of the rollers ( 7 ,  12 ) are curved transversely to the direction of travel and that the running faces ( 7 ′,  12 ′) have a high coefficient of friction similar to that of rubber.  
     
     
         2 . A roller sport device according to  claim 1 , characterised in that the rear axle is centered for straight running by means of elastic elements ( 6 ′,  6 ″,  48 ,  77 ,  78 ,  144 ).  
     
     
         3 . A roller sport device according to either one of claims  1  or  2 , characterised in that the trailing angle ranges between 30° and 70°.  
     
     
         4 . A roller sport device according to any one of the preceding claims, characterised in that the running faces ( 7 ′,  12 ′) are curved approximately spherically, with a radius of curvature which approximates to the roller radius, so that the distance from the point of contact of the respective roller ( 7 ,  12 ) to the center thereof does not substantially change over the entire range of oblique positions which can be covered.  
     
     
         5 . A roller sport device according to any one of the preceding claims, characterised in that the running faces ( 7 ′,  12 ′) are formed transversely to the direction of running so that the distance from the roller center to the point of contact of the roller ( 7 ,  12 ) is a minimum when the roller axles are horizontal.  
     
     
         6 . A roller sport device according to any one of the preceding claims, characterised in that the running faces are cylindrical over a narrow central region.  
     
     
         7 . A roller sport device according to any one of the preceding claims, characterised in that the distance from the rear roller axle ( 8 ,  31 ) to the steering axle ( 3 ,  21 ,  25 ,  32 ,  34 ,  41 ,  71 ) is less than the roller radius.  
     
     
         8 . A roller sport device according to any one of the preceding claims, characterised in that the distance of the steering axle ( 3 ,  21 ,  25 ,  32 ,  34 ,  41 ,  71 ) from the rear roller axle ( 8 ,  31 ) is about {fraction (2/10)} to {fraction (6/10)} of the roller radius.  
     
     
         9 . A roller sport device according to any one of the preceding claims, characterised in that the distance between the rear roller axle and the steering axle is zero or negative.  
     
     
         10 . A roller sport device according to any one of the preceding claims, characterised in that the two rollers ( 7 ,  12 ) are each divided transversely to the roller axle into two half rollers which are at a spacing from each other for the passage of parts which bear the mounting.  
     
     
         11 . A roller sport device according to any one of the preceding claims, characterised in that the rear roller axle ( 8 ,  31 ) is attached to a steering body ( 6 ,  29 ,  36 ,  72 ) which can swivel about the steering axle ( 3 ,  21 ,  25 ,  32 ,  34 ,  41 ,  71 ) by overcoming elastic restoring forces.  
     
     
         12 . A roller sport device according to claims  10  and  11 , characterised in that the two half rollers of each roller are separately rotatably mounted on the associated roller axle, wherein the front roller axle is fixed and the rear roller axle is fixedly attached to the steering body.  
     
     
         13 . A roller sport device according to claims  10  and  11 , characterised in that the two half rollers of each roller ( 7 ,  12 ) are fixedly attached to each other by means of the associated roller axle ( 8 ,  31 ;  13 ), wherein the front roller axle ( 13 ) is rotatably mounted in the frame ( 1 ,  71 ) and the rear roller axle ( 8 ,  31 ) is rotatably mounted in the swivelling steering body ( 6 ,  29 ,  36 ,  72 ).  
     
     
         14 . A roller sport device according to any one of  claims 10  to  13 , characterised in that the half rollers of at least the rear roller ( 7 ) are of shell-like construction so that they enclose a void.  
     
     
         15 . A roller sport device according to any one of the preceding claims, characterised in that the rollers ( 7 ,  12 ) consist of a supporting shell made of light metal or plastics and of an external covering ( 7 ′,  12 ′) made of a polymer with a high coefficient of friction (vulcanised rubber, polyurethane, natural rubber) in relation to the road surface.  
     
     
         16 . A roller sport device according to any one of the preceding claims, characterised in that the rear roller ( 7 ) is larger than the front roller ( 12 ).  
     
     
         17 . A roller sport device according to any one of the preceding claims, characterised in that the spacing of each of the two half rollers of a roller ( 7 ,  12 ) in relation to each other is adjustable.  
     
     
         18 . A roller sport device according to any one of the preceding claims, characterised in that the rollers ( 7 ,  12 ) are provided with a hard covering further inwards and with a soft covering further outwards.  
     
     
         19 . A roller sport device according to any one of the preceding claims, characterised in that the roller axles are fixed to a frame ( 1 ,  71 ) which consists of a supporting beam and which is provided at the top with placement holders ( 2 ) for fixing a shoe, that the front end of the frame protrudes through the gap between the front half rollers ( 12 ) and bears the front roller axle ( 13 ), and at the rear the frame comprises a steering stub ( 3 ,  21 ,  25 ,  32 ,  34 ,  41 ,  71 ) which forms the steering axle and which is fixedly attached to the frame, and which protrudes between the rear half rollers ( 7 ) into the interior thereof, and that the steering body ( 6 ,  29 ,  36 ,  72 ) is disposed inside the rear roller ( 7 ).  
     
     
         20 . A roller sport device according to  claim 19 , characterised in that the frame comprises means for the variable fixing of a shoe, particularly slots and wedges which can be placed underneath.  
     
     
         21 . A roller sport device according to  claim 20 , characterised in that the shoe is fixed to the frame ( 1 ,  71 ) with its heel raised, preferably at an angle of 10° to 17°.  
     
     
         22 . A roller sport device according to any one of  claims 19  to  21 , characterised in that the steering stub ( 32 ,  34 ) is integrally formed on the frame ( 1 ).  
     
     
         23 . A roller sport device according to any one of  claims 19  to  21 , characterised in that the steering stub ( 3 ) is anchored in the frame ( 1 ) by a detachable friction cone joint ( 4 ).  
     
     
         24 . A roller sport device according to any one of  claims 19  to  21 , characterised in that the steering stub ( 21 ) is undetachably pressed into the frame ( 1 ).  
     
     
         25 . A roller sport device according to any one of  claims 19  to  24 , characterised in that the steering stub is provided with a bent-round end piece which protrudes obliquely forwards from below into the frame and is anchored there.  
     
     
         26 . A roller sport device according to any one of the preceding claims, characterised in that the steering stub ( 3 ) is bent and is anchored by means of a screwed joint ( 5 ) so that the direction of action of the screwed joint ( 5 ) points towards the point of contact of the rear roller ( 7 ).  
     
     
         27 . A roller sport device according to any one of  claims 19  to  22 , characterised in that the steering stub ( 25 ) is disposed between two extensions on the frame which protrude from the frame above and below the steering stub.  
     
     
         28 . A roller sport device according to any one of claims of  19  to  27 , characterised in that the steering body ( 6 ) has a bore with which it is fitted over the steering stub ( 3 ′) in the manner of a sleeve, wherein the bore is wider than the steering stub ( 3 ′), and that the gap between the bore and the steering stub ( 3 ) is filled with an elastically resilient material ( 6 ′).  
     
     
         29 . A roller sport device according to any one of  claims 19  to  28 , characterised in that the cross-section of the steering stub ( 3 ) has the shape of a rectangle standing on edge.  
     
     
         30 . A roller sport device according to  claim 29 , characterised in that the cross-section of the bore has the shape of a rectangle standing on edge which is drawn in horizontally in the middle, the narrowest point of which is at half its height and corresponds approximately to the width of the steering stub ( 3 ) (butterfly shape).  
     
     
         31 . A roller sport device according to any one of  claims 10  to  27 , characterised in that the steering body ( 72 ) comprises a lever-like extension ( 76 ) which protrudes towards the frame between the two half rollers and the free end of which is held elastically in the frame ( 70 ).  
     
     
         32 . A roller sport device according to  claim 31 , characterised in that the free end of the extension ( 76 ) is held in the frame between two elastic bodies ( 77 ,  78 ).  
     
     
         33 . A roller sport device according to any one of the preceding claims, characterised in that two restoring springs which are coupled to the steering body are prestressed in relation to each other and are secured by limit stops so that a threshold moment has to be overcome in order to rotate the steering body.  
     
     
         34 . A roller sport device according to any one of  claims 1  to  27 , characterised in that the steering stub is formed as a torsion spring to which the steering body is fixed directly or on which the steering body is integrally formed.  
     
     
         35 . A roller sport device according to any one of the preceding claims, characterised in that the restoring resistance of the steering and/or the threshold moment of the steering body are adjustable.  
     
     
         36 . A roller sport device according to any one of  claims 10  to  27 , characterised in that the gap between the half rollers of the rear roller is closed by a stone guard ( 139 ) which is fixed to the steering body, and the gap between the half rollers of the front roller is closed by a stone guard ( 138 ) which is fixed to the frame at least in the region of the points of contact of the rollers.  
     
     
         37 . A roller sport device according to any one of  claims 19  to  36 , characterised in that a brake block ( 180 ) made of a abrasive material, which projects backwards beyond the rear roller, is fixed to the steering body ( 6 ) so that when the entire frame ( 1 ) is slightly tilted said block contacts the ground at the back and produces a braking force.  
     
     
         38 . A roller sport device according to any one of the preceding claims, characterised in that the rollers are of unsymmetrical design.  
     
     
         39 . A roller sport device according to any one of the preceding claims, characterised in that a parking brake ( 38 ) is provided by means of which at least one of the rollers can be fixed, and that the parking brake ( 38 ) is formed by a pin/locking element which can be inserted in the rollers/roller axle or can be inserted via a polygonal formation on the roller, and which are comprises a grip in the form of a protruding mark which is easily visible.