| 摘要 |
PCT No. PCT/IB97/00572 Sec. 371 Date Nov. 23, 1998 Sec. 102(e) Date Nov. 23, 1998 PCT Filed May 20, 1997 PCT Pub. No. WO97/44563 PCT Pub. Date Nov. 27, 1997An assembly for locking a curtain in a selected position has a hollow roller unto which a curtain is rolled and unrolled, the roller containing an elastic winding device, and a locking device for locking the roller in the selected position. The locking device has a support coupled to the roller, the support having a cavity which receives co-axially and rotatably at least one locking element that has an elastic band which frictionally engages the support to hinder free rotation of the roller. The elastic band has a first end fastened to the locking element with the band wound around the locking element so that the band is in frictional contact with the support. Turning the roller in the curtain unrolling direction stretches the elastic band thus reducing the band diameter and reducing friction while turning the roller in the curtain rolling up direction in response to the elastic rewinding device increases the band diameter and increases friction so as to overcome the rewinding action and lock the curtain in the selected position.
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