| 摘要 |
<p>The body (4) has an integrally formed foot (10) comprising a flange (11), where the body exhibits spherical shape with exception of the foot. A valve (14) is provided in a cavity (48), where diameter of the body is 4-20 cm. The foot exhibits a round cross section with diameter of about 3-10 cm, and the flange exhibits a round cross section with diameter of about 7-18 cm, where the body is made of a plasticized PVC and manufactured by a rotation casting process. A spherical part (6) of the body extends with respect to rotational symmetry axles around 135 degrees. An independent claim is also included for a balancing device comprising a balance board.</p> |
