Training device for use by e.g. children, has roller body arranged inside ring, where external dimensions of body are adapted to inner cross-sectional dimensions of ring in such a manner that body inside of ring passes through closed path

摘要

The training device has a ring (1) designed as continuously hollow, where a roller body (4) is arranged inside the ring. External dimensions of the roller body are adapted to the inner cross-sectional dimensions of the ring in such a manner that the roller body inside of the ring passes through a closed path. The material of the ring and the roller body are selected in such a manner that an acoustically sensible signal is produced with a sufficient speed of the roller body.