| 摘要 |
<p>An aperture closure arrangement (10a) has an aperture closure (12a) formed from a plurality of panels (39) hinged together at generally horizontal axes. Each (panel 39) has a runner (16a) fixed near its upper edge and constrained to run in a (track 31). The track (31a, 31 b, 31c) defines the path of the runners (16a), as the aperture closure (12a) opens and closes, and therefore defines the movement of the (panels 39). An elongate flexible member (22a) in the form of a cable or chain is connected to the aperture closure (12a) at an attachment point (24a). The elongate flexible member (22a) is also connected to a drive arrangement (not shown) operable to pull open the aperture closure (12a). Guide members (30, 32) define the path of the elongate flexible member (22a) between the attachment point 24a and the drive arrangement (not shown). At least one of the guide members (30) is a deflection member sufficiently close to the track (31c) to allow the attachment point (24a) to pass the deflection member (30) beyond the deflection member (30) when viewed from the said path, as the aperture closure (12a) closes and opens, thereby threading and unthreading the elongate flexible member (22a) from the deflection member (30).</p> |
