| 摘要 |
<p>The cover grid has a rectangular frame (1) and a number of angled lamella elements (4) supported at equal vertical spacings within the frame opening (3) between the opposing vertical side arms of the frame. The lamella elements each have a Z-shaped cross-section, with the upper and lower profile flanges (5,8) at opposite ends of each lamella element secured to the vertical side arms of the frame at either side, e.g. by spot welding.</p> |
