Patent ID: 7600644

Claim:
A locking drain filter for floor drains with drain wells comprising: an upper filter portion having external dimensions that allow the upper filter portion to be inserted into a drain line at the bottom of the drain well; a lower filter portion having first external dimensions that allow the lower filter portion to be inserted into the drain line and second external dimensions that allow the lower filter portion to be inserted into the upper filter portion; a compressible gasket having external dimensions that allow the compressible gasket to be inserted into the drain line when the compressible gasket is in an uncompressed state and internal dimensions that allow the compressible gasket to be placed over the second external dimensions of the lower filter portion; a compression device applying a compressive force to the upper filter portion and the lower filter portion so as to cause the compressible gasket to be compressed by the upper filter portion and the lower filter portion and to expand radially so as to lock the upper filter portion and the lower filter portion into the drain line if the upper filter portion, compressible gasket, and lower filter portion have been inserted into the drain line prior to the application of the compressive force; wherein the compression device further comprises a plurality of bolts that extend through the upper filter portion and the lower filter portion to mate with a corresponding plurality of nuts in the lower filter portion, and wherein the plurality of bolts extend through a corresponding plurality of filter grate holes, and further comprising a plurality of washers to prevent a head of each of the plurality of bolts from passing through the corresponding grate hole.