| 摘要 |
<p>The roller-shutter type closure has a track to cover the opening, winding up on a spindle and led in guideways on both sides. The track (1) has a guide cable (6) fixed to its open end, led back to the spindle (3) via pulleys (5) fitted to the opposite end of the shaft. There it can be spirally wound up and unwound in the opposite winding direction, with cable and track having approx. the same winding diameter. The winding disc plates (7) holding the guide cable may be conically shaped, with their broad base adjoining the wound-up track on both sides. The track can be made of textile material. The front edge of the track is engaged by a force which supports its unwinding movement.</p> |
