| 摘要 |
<p>The ring has an outer ring (3) that is pivotably stored on an inner ring (1). The inner ring has two pins (2) that are diametrically and radially opposite to each other. The outer ring has an annular groove for rotational storage of the outer ring on the inner ring. The pins are storable in the groove for coaxial rotational movement of the outer ring on the inner ring. An intermediate ring provided between the inner and outer rings is rotatably stored in the groove in a coaxial manner, where the inner ring with pins is tiltably stored in the intermediate ring.</p> |
