Spherical system e.g. ball, rolling recreation device for use by infant, has hollow rolling ball unit placed in center, and machined slots arranged on inner surface of ball unit whose semi-spheres are filled with ballast elements

摘要

The device has a hollow rolling ball unit (3) placed in center, and machined slots (2) arranged on an inner surface of the ball unit. The slots are arranged to collect ballast elements (1) i.e. steel carrier beads, that are housed on the inner surface of the ball unit. The ballast elements are stuck on the slots at a lower part of a sphere. The ball unit has diameter of 22mm, width of 4mm and depth of 2mm. Semi-spheres of the ball unit are filled with the ballast elements.