| 摘要 |
An improved door elevating system for use with a door having a plurality of horizontal door panels hinged together at their horizontal edges and guided at their vertical edges between a pair of guide rails. The system comprises means to displace the door along the guide rails and having a door lifting cable secured at one end to a bottom portion of the door and extending along a vertical edge of the door. An opposed end of the cable is wound on a rotatable drum rotatably supported in alignment with the vertical edge. The drum has an outer cable receiving surface on which the cable can be wound. The drum further has a vertical bearing side face and a free side face. The free side face faces inwardly of the door and a cable passage is provided inside the drum and has an exit port in the free side face whereby the opposed end of the cable exits. An adjustable fastening means is provided to secure the cable in the passage.
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