| 摘要 |
<p>A device designed to ensure a smooth and tight fit of the sheet over the mattress, which includes a locking pin or convex cap and a base comprising a horizontal, bottom plate and a vertical plate with a locking hole or protrusion, respectively, whereby the sheet may be fit smoothly and tightly over the base and the locking pin inserted into the locking hole, or the convex locking cap fit over the protrusion, thus ensuring a smooth and tight fit of the sheet over the mattress.</p> |
