| 摘要 |
A C-shaped member (12) is slidably supported in a suspended position by a support arm (22). The support arm (22) is rotatable about an axis of lateral rotation (30) and is slidably mounted to an outer circumference (16) of the arc-shaped member (12) at a point of attachment coinciding with the axis of lateral rotation (30). Since the support arm (22) is attached to the C-shaped member (12) in alignment with the axis of lateral rotation (30), the support arm (22) does not introduce eccentric lateral moment-arm action during lateral rotation and thereby provides a more stabile, balanced support structure (20).
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