| 摘要 |
<p>A mattress (8) is positioned on a flexible deck (4) which is supported by tension members (16) connected to a frame (2). In a preferred embodiment, the frame is formed of concave side rails (28, 30), a horizontal head rail (24), and a horizontal foot rail (26). The upper surface (32) of the deck (4) is longitudinally concave and transversely convex. The mattress (8) is tapered so that its upper surface (14) is transversely and longitudinally crowned to counteract any potential sagging effect when a person lies on the mattress.</p> |
