| 摘要 |
An arrangement in lamellar venetian blinds which are provided between the window panes of a double-glazed window, and with a device for rotating lamellae (7) about their longitudinal axes and to displace them across their longitudinal axes. Said lamellae are mounted at their ends in two opposite frame sides (4, 6), in guides (14, 15) permitting movement of lamellae (7) across their longitudinal axes to prevent movement in their longitudinal direction. At said opposite frame sides (4, 6) two parallel threaded spindles (12, 13) are provided at a mutual distance and are driven by the aid of a driving means with reversible direction of rotation. At the ends of each lamella (7) a crosspiece (9) is provided, the two ends of which engage threads (11) in a spindle (12, 13, resp.). Said driving means is designed to permit the spindles to rotate at different speeds, or to permit spindle (12) to be driven, whereas the other spindle (13) is at standstill for a short period so as to achieve rotation of lamellae (7) about their own axes. |
