| 摘要 |
<p>The device has an upper axle supporting winding drums (6, 7) and constituted of a tube (8) supported by side wall fixations (13, 14). A tubular rotary driving motor (15) is associated to one of ends of the tube, and a bearing (16) is associated to other end of the tube. A section of the tube is polygonal in shape and dimensioned according to weight and length of a sectional or tilting door (5) to confer resistance against bending and torsion, to the tube. An internal section of the drums is similar to an external section of the tube with near assembling clearance.</p> |
