Importance

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Abstract

A drain provides significant advantages over the prior art. A drain fabricated without seams can be easily cleaned and does not provide sites for bacterial growth. The cone and outlet sections of the drain are formed using a spinning process to eliminate the need for welds. The cone section includes a vertical interface lip, such that the outside of the cone section is welded to the rim, eliminating a weld on the interior of the cone. The weld between the rim and the cone section can be polished to eliminate imperfections on the top of the drain. The contour of the cone section also facilitates drainage, and hence reduces bacterial growth, by maintaining a downward slope on a smooth surface. For an embodiment with a membrane flange, dual walls are used such that the membrane flange can be welded to the outer wall of the drain, preventing the welding process from damaging the smoothness of the interior drain wall.

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First Claim