Patent ID: 6341391
Filing Date: 2002-01-29
Classification: E03C

Abstract:
An improved hidden drain outlet structure for sink, comprising:a drain pipe having external screw threads, a drain passage located inside, a neck section located at an upper portion of the drain passage having a slant inside wall forming a smaller diameter than the drain passage, a plunger moveably located in the drain passage and a control bar having one end engaging with the plunger, the plunger having a plunger flange located at the top end thereof and a seal ring engaging with the circumference of the plunger flange; a hollow drain head having internal screw threads for engaging with the external screw threads of the drain pipe, a plurality of reinforced curved ribs located at the top end thereof and an annular arch-shaped ring formed at the periphery which has an outer rim tilted upward, the ribs joining in the center at a juncture and having an aperture formed in the juncture for holding a screw nut therein; the aperture and outer rim being at a higher level than other portion of the annular ring for the upper side of the drain head to form a double curved slope converged in the middle portion to form a valley; and a filter located above the drain head and formed substantially in a circular disk mating with the upper side of the drain head and having a recess through hole in the center for engaging with the screw nut through a screw, a plurality of water discharge slots extended outward from the through hole, and an annular rim to engage with the annular ring of the drain head.