Window unit

摘要

A window unit (102), comprising: a first sheet (301); a second sheet portion (304); a third sheet portion (308); and an actuation means. The first sheet (301) defines first high transmittance regions (302A, 302B) and first low transmittance regions (303A, 303B). The second sheet portion (304) is positioned substantially parallel to the first sheet, and defines second high transmittance regions (306A, 306B) and second low transmittance regions (307A, 307B). The third sheet portion (308) is positioned substantially parallel to the second sheet portion, and defines third high transmittance regions (309A, 309B) and third low transmittance regions (310A, 310B). The actuation means (507, 523, 524) is configured to simultaneously move the second sheet portion and the third sheet portion from an open configuration, to a closed configuration. In the open configuration the second and third high transmittance regions are aligned with the first high transmittance regions. In the closed configuration, the second high transmittance regions are not aligned with the first high transmittance regions and the third high transmittance regions are not aligned with the first or second high transmittance regions.

主权项

1. A window unit, comprising:
a first sheet defining first high transmittance regions and first low transmittance regions; a second sheet portion positioned substantially parallel to said first sheet, said second sheet portion defining second high transmittance regions and second low transmittance regions; a third sheet portion positioned substantially parallel to said second sheet portion, said third sheet portion defining third high transmittance regions and third low transmittance regions; an actuation device configured to simultaneously move said second sheet portion and said third sheet portion from an open configuration, in which said second and third high transmittance regions are aligned with said first high transmittance regions, to a closed configuration, in which said second high transmittance regions are not aligned with said first high transmittance regions and said third high transmittance regions are not aligned with said first or second high transmittance regions; and at least four positioning members comprising: a first upper positioning member, a second upper positioning member, a first lower positioning member, and a second lower positioning member, wherein: said second sheet portion extends along a plane defined by said first upper positioning member and said first lower positioning member, is arranged substantially parallel to said third sheet portion, and is connected to said third sheet portion by a connection portion comprising a flexible sheet material, said third sheet portion extends along a plane defined by said second upper positioning member and said second lower positioning member so that said second sheet portion is positioned substantially parallel to, and spaced apart from, said third sheet portion and said first sheet, and said connection portion extends around at least one guide member defining a path along which the connection portion is moveable, the guide member comprising one of said positioning members.