Patent ID: 7704386

Claim:
A filter assembly for a drain in the base of a bath, basin, sink, shower or in a floor, said drain having a waste or drain pipe and a tubular end pipe fitting or socket at the end of the waste or drain pipe and set within the base or floor, said end pipe fining or socket having a shoulder therein, said filter assembly comprising: a strainer of a disc shape adapted to be located in said end pipe fitting or socket of said drain to seat on said shoulder and be substantially flush with the surface of said floor or base adjacent said socket or fitting, and a hollow filter means detachably secured to said strainer on the underside thereof and adapted to extend into said drain to filter liquid passing through said strainer, said filter means comprising a hollow filter basket, said filter basket being integrally moulded of plastics and having a central longitudinally extending axis, an annular rim at an upper end and a base at a lower end, said base having a plurality of openings therein and being spaced along said central axis from said annular rim and a frustoconical side wall centred on said axis and extending between and joining said base and said annular rim, said side wall having an upper frustoconical wall portion and a lower frustoconical wall portion, said upper frustoconical wall portion being defined by a plurality of substantially longitudinally extending circumferentially spaced apart ribs defining therebetween an upper set of slots or openings spaced around said axis and said lower frustoconical wall portion being defined by a plurality of substantially longitudinally extending circumferentially spaced apart ribs defining therebetween a lower set of slots or openings spaced around said axis, said ribs of said upper frustoconical wall portion being spaced apart a circumferential distance greater than the circumferential distance between the ribs of said lower frustoconical wall portion such that said slots or openings in the upper set are of a greater cross sectional area than the slots or openings in the lower set, and wherein said strainer with the filter means attached are removable from said end fitting or socket for cleaning.