| 摘要 |
A thermally insulating screen is provided for glass-houses, large expanses of window, and the like. The screen has one fixed margin and one free margin and can be deployed and retracted substantially in its own plane. It is fabricated from plastics film and comprises a close array of parallel tubular air chambers arranged perpendicular to the direction of deployment and retraction, each chamber folding flat into a plane perpendicular to the screen plane when the latter is retracted. The open ends of the chambers are guarded by flaps which permit the entry and release of air during expansion and contraction of the chambers but discourage convection. When mounted for use in a horizontal attitude the screen depends from gliders or pulleys on a fixed track.
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