Clamping connection

A clamping connection for clamping a plastic water box to a sheet metal end plate which accepts a bundle of tubes for a heat exchanger, the connection comprising:

• (a) a flange on the plastic water box, said flange extending from the plastic water box in a direction toward said sheet metal end plate, said flange describing a generally rectangular shape which defines an open side of said plastic water box, said flange having a shoulder defining a surface which faces away from said metal end plate;
• (b) a groove in said metal end plate, said groove being of such size and configuration that said flange may seat therein in mating engagement with the sidewalls thereof, said groove having a generally rectangular shape corresponding with said generally rectangular shape described by said flange of said water box, said groove having a bottom;
• (c) said groove being defined by a deformable outer edge extending around said metal end plate adjacent its periphery, an inner side disposed inwardly of said outer edge in opposed relationship thereto, and an underside which extends perpendicularly between said inner side and said outer edge, said underside defining said bottom of said groove;
• (d) a packing in said groove for effecting a fluid-tight seal between said plastic water box and metal end plate;
• (e) said outer edge on said metal end plate being deformable from a first, undeformed condition in which said edge is a continuous edge in a vertical plane which is straight along most of its length to a second, deformed condition in which said edge has a continuously corrugated configuration in substantially vertical and horizontal planes including alternately deformed partial areas and undeformed remaining areas therebetween and with the transition from the horizontal into the vertical planes providing a stiffining surface in a plurality of planes and transversing substantially the entire width of said shoulder;
• (f) said flange and outer edge having an unclamped condition in which said deformable edge is in its undeformed condition and a clamped condition in which said deformable edge is in its deformed condition;
• (g) said deformed partial areas positively and lockingly engaging said surface of said flange when said flange and edge are in the clamped condition to form a positive joint;
• (h) said packing being in a compressed condition between said deformed partial areas and said bottom of said groove when said flange and edge are in the clamped condition.