| 摘要 |
A rotating apparatus including a base and a rotating element is provided. The base has first and second concave spherical surfaces. The rotating element includes first and second universally-jointing portions. The first universally-jointing portion has a first convex spherical surface. The first convex spherical surface is universally jointed to the first concave spherical surface. The second universally-jointing portion is fixed on the bottom of the first universally-jointing portion and has a second convex spherical surface. A curvature radius of the second convex spherical surface is smaller than a curvature radius of the first convex spherical surface. The first and second convex spherical surfaces have the same curvature center. The second convex spherical surface is universally jointed to the second concave spherical surface and the rotating element is supported on the second concave spherical surface of the base by the second universally-jointing portion. |
