| 摘要 |
<p>A blind is described which includes a cord driving mechanism comprising a pulley (56) having a circumferential, radially outward-facing and toothed groove (18) and a shoe (84), relative to which the pulley (56) rotates, surrounding at least part of the circumferential groove in the pulley. A cord passes around the pulley (56), in the space defined by the circumferential groove (18) and the shoe (84). The cord is retained in the groove (18) by contact with the shoe (84). The dimensions of the groove (18) and/or the spacing between the groove (18) and the shoe (84) and/or the size of the cord is/are selected to provide a desired resistance to rotation of the pulley (56) and/or a desired maximum load which can be exerted on the cord.</p> |
