Patent ID: 8316474

Claim:
A drainage apparatus for a sink, comprising: a main body having a drainage hole formed thereon, the main body including an annular retaining step formed on an inner peripheral wall defining the drainage hole, and a coupling member formed unitarily with the main body and extending downwardly from the annular retaining step and having a male screw portion on an outer surface of the coupling member; a tubular drainage body having a female screw portion screw-coupled to the male screw portion of the coupling member, and a transportation hose for connecting to a lower portion of the tubular drainage body; a filtering mesh for filtering water from residue substances in the sink; and a cover for covering the drainage hole with the cover seated on the annular retaining step, wherein the filtering mesh includes a plurality of pillars extending downwardly from a lower annular edge thereof so as to define a space portion therein for receiving a float ball therein, and the plurality of pillars are seated on an inner lower portion of the tubular drainage body.