| 摘要 |
<p>The sheet metal fixture fishplate is suitable for use on trapezoid sheet metal roofs, with a sheet metal strip pierced by screws. There are a number of grooves (5, 6) in one side of the sheet metal strip (1), separated by flat areas (24). Parts (20) of some depressions (5) at least partially surround the places where screws pass through (4), while the other parts (21, 22) or other depressions (6) run lengthways along the sheet (2). This avoids formation of upright protruding edges which could damage the top sealing length.</p> |
