Patent ID: 8408283
Filing Date: 2013-04-02
Classification: B21D,B23P,F28D,F28F,Y10T

Abstract:
1. A serpentine fin for assembly between tubes in a heat exchanger core comprising: a metal strip having a width between opposite strip edges and a length greater than the width, the strip edges having a hem formed thereon comprising a double thickness of the strip material extending a portion of the distance inward from the edge, the metal strip having folds extending across the strip width such that the strip forms a serpentine shape with adjacent folds residing along a length of the strip material, the folds being adapted to contact the tubes in the heat exchanger core; at least one row of split louvers residing between the adjacent folds, the at least one row of split louvers comprising louvers having openings extending in the direction of the strip length and formed in adjacent, spaced louver banks extending at least a portion across of the width of the strip, the split louvers residing one over the other between the adjacent folds across the strip width; and ribs substantially parallel to the louver openings adjacent the strip edges and in at least one center portion of the strip between the strip edges, the ribs extending across the spaced louver banks, the ribs adjacent the strip edges being end ribs each having an angled leg and a bent portion whereby the hem extends from the hem edge along the angled leg and at least partially follows along the contour of the end rib bent portion.