| 摘要 |
<p>A rolling weighted base (10) for supporting an object (12) and for facilitating the movement of the object along a hard surface, the base connected to the object by a vertical shaft (14), the base comprising: at least three weight balls (20) and a housing (22) configured to receive the vertical shaft and to hold the at least three weighted balls rigidly spaced apart so that the at least three balls do not touch each other, the at least three balls partially protruding from the housing toward the hard surface and free to rotate inside the housing.</p> |
