Rounded corrugated sheet and method and apparatus for its manufacture
OwnerOve Ahnstrominventor
Life of this patent
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Abstract
The present invention relates to rounded corrugated sheeting (4) whose profile exhibits crest portions (5), flanks (6), and bottom portions (7). The crest portions (5) are located on the concave side of the rounded sheet and are provided with grooves formed by pressing during rounding of the sheeting. The grooves form ribs (10) on the convex side of the sheet. In the rounding of the sheet, the material present in the crest-portions (5) of the sheet (4) is distributed in a manner which facilitates rounding and counteracts the formation of folds or wrinkles in the crest portions (5), and prevents other forms of damage.
Claims9
A rounded or longitudinally curved corrugated sheet having a concave side within said longitudinal curve and an opposite convex side, comprising
- a series of adjacent generally U-shaped portions each having an exterior and an interior, said series of adjacent generally U-shaped portions extending parallel to one another and each said U-shaped portion being defined by diverging flanks (6) having proximal edges connected by a bottoms surface (5), said flanks also having distal edges, said U-shaped portions being joined to adjacent U-shaped portions by generally planar crests (7) extending between distal edges of the said flanks (6), said bottom surfaces lying along the concave side of said sheet and said crests lying along the convex side of said sheet;
- each of said bottom surfaces (5) having a continuous longitudinal groove with a rounded cross sectional shape pressed therein from said exterior, and each said groove occupying substantially the entire transverse width of its bottom surface to form a rounded rib (10) on the interior of the U-shaped portion;
- said grooves being formed in a flat, corrugated sheet during a bending operation giving said sheet its rounded shape, said crests (7) and flanks (6) retaining their original shapes during said bending operation without being altered or deformed.
Dependencies are inferred from the claim text.