| 摘要 |
<p>A device to transform the rolling surface of a moving body on a track. It is characterized by, firstly, a concave element (21) designated ''envelope'', and, secondly, at least one other element (2, 20, 22) installed in the concave area (8) of the envelope area (21) and comprising both the means (9, 90, 2, 20) to ensure that it is guided during its movements, in particular those transverse to the track, in relation to at least one other element, and the means to ensure the positioning of the elements relative to each other. Application in the industry of games and sporting equipment.</p> |
