| 摘要 |
<p>Balance cushion has hollow core covered by a skin. It has a bottom (2), upper cover area (4), side area (6) which is connected via intermediate areas to the bottom and cover areas and which extends between them. The hollow core defines a fluid- fillable space enclosed by the core skin which is filled with fluid. The cover forming bottom, top and sides is made of one piece of plastic. Alternatively, the bottom of the cushion can form a rigid structure which is combined with the essentially flexible cover and side areas to form the hollow core. The rigid structure has a reinforcing element at least partly inserted into it.</p> |
