| 摘要 |
<p>The sectional door has curved profile (2) comprising circular arc segments (3,4) that are limited by guide bumps (8-10). The circular arc segments having specific radii, are tapered along specific directions. The successive circular arc segments are alternately spaced by specific distances. The mid points (15,16) of circular arc segments are set on an imaginary line passing through the guide bumps. The midpoint (15) is on an imaginary line lie with curved profile, and midpoint (16) is on an imaginary line lie with the guide bumps.</p> |
