Gymnastic apparatus comprises inflated, flexible hemisphere with rigid base plate which is mounted on annular support with integral spring around its upper edge which rests against ball and seals components together

摘要

Gymnastic apparatus comprises an inflated, flexible hemisphere (10) with a rigid base plate (30). This is mounted on an annular support (20) with an integral spring (21) around its upper edge which rests against the ball and seals the components together.