| 摘要 |
<p>A first supporting member (10) supports a first seat member. A second supporting member (60) supports a second seat member rotatable relative to the first seat member. An angular restrictor (80, 90) is provided between the first and the second supporting members (10, 60) for restricting an angle between the first and the second supporting members (10, 60) within an angular range. <IMAGE> <IMAGE></p> |
