Toy for e.g. children has a round ring with a round cross sectional thickness and a layer for a perpendicular axis in the direction of rotation

摘要

The toy has a round ring (4) with a round cross sectional thickness and a layer for a perpendicular axis in the direction of rotation. A concave shell (2) is the same diameter or larger than the ring diameter. The ring is made from metal and the shell can be made from metal e.g. stainless steel and stone or glass. The shell has a polished inner surface and a weight of 25kg. The ring moves around the shell due to momentum.