| 摘要 |
A center portion extends loosely over a person on a mattress such that the person has freedom of movement on the central region of the mattress. The portion is secured by zips at either side to side portions which are secured to tubular members at either side. Movement of the person towards or over one side of the bed is limited by the center portion being placed in tension with the side portions preventing the person from moving towards or over or falling off the side of the bed.
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