| 摘要 |
An improved roll-up closure utilizing a flexible cover or curtain selected from a material suitable to effect the type of closure sought. The cover is at least as wide as the portal to be covered and is typically longer than the portal. Each lateral margin of the cover has a strip of hook and loop fastener material affixed thereto, and a complementary strip is affixed to the lateral margins of the structure defining the portal. A first end of the cover is rigidly affixed across a first margin of the portal. The opposite end of the cover can be upturned and connected to a driven take-up roller mounted to the first margin of the portal. In this embodiment, an elongated transverse rod is supported within the upturned end of the cover. In an alternate embodiment, the opposite end of the cover is attached to an elongated transverse rod such that as the curtain is raised or lowered, the curtain is wound or unwound around the rod, respectively. In either embodiment, activation of the driven roller lengthens or shortens the effective length of the cover while positioning the mating hook and loop fasteners to seal and unseal the cover to the lateral margins of the portal. The rod can either have sufficient weight to maintain tension on the cover such that the cover forms an adequate seal with the lateral margins of the portal, or in the alternative, a secondary rod can be utilized to maintain tension on the cover.
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