Basket sink strainer

Claim 1

In a basket sink strainer, the combination of: a. a bowl having an annular rim extending radially outwardly from its upper end and a cylindrical extension projecting downwardly from its lower end, b. said bowl, rim and cylindrical extension being disposed in coaxial relation to each other, c. said cylindrical extension having a plurality of external helical screw threads formed thereon and being provided with a bottom wall having drain openings formed therein, d. a retaining plate of generally triangular configuration in plan view having a vertically, upwardly directed peripheral flange extending over the entire periphery thereof and providing structural strength and rigidity thereto and an internal screw thread formed therein engaging the external helical screw threads of the cylindrical extension to mount said retaining plate on said cylindrical extension, e. a floating pressure ring encircling the bowl below and in substantial registration with the annular rim of said bowl, f. an annular washer between said rim and said pressure ring, g. a plurality of internally threaded holes formed in the retaining plate, and h. clamping screws in said internally threaded holes engaging the pressure ring for adjustably clamping the pressure ring and washer and the annular rim of the bowl to the bottom wall of a sink at its drain opening and i. an internally threaded clamping collar in screw-threAded engagement with the externally threaded cylindrical extension of the bowl, for attaching said cylindrical extension to a drain pipe.