Internal trap drain with adjustable height strainer and high mass seal
View Patent ↗An internal trap drain with large volume/high mass water seal for improved absorption of pressure fluctuations and extended duration of seal against evaporation in low-use conditions. Includes adjustable height strainer and water seal-protected weep holes.
1. An internal trap drain wherein the trap seal is formed by the interposition of an inner bowl filled with liquid and an externally-threaded adjustable height cylindrical strainer with axis perpendicular to the surface of said liquid and having a top end enclosed by strainer grid and a bottom end open and submerged below said surface and in which the adjustable strainer/seal is constructed and arranged to provide a large volume of liquid to create the seal and eliminate sewer gases thereby eliminating the need for the p-trap which conventional drains require; wherein the improvement comprises a high-volume, high mass seal to oppose sewer gases.
2. The internal trap drain of claim 1 in which an adjustable-height strainer is operably connected to the drain assembly; wherein the improvement comprises an adjustable-height strainer.
3. The internal trap drain of claim 1 in which a cleanout opening at the base of the inner bowl, a cleanout plug, and gasket to provide liquid-tight seal between said cleanout plug and said inner bowl are operatively connected to said inner bowl; wherein the improvement comprises the cleanout opening, cleanout plug and gasket.
4. The internal trap drain of claim 1 in which weep openings, said weep openings connected to weep tubes, said weep tubes comprising cylinders with the top end operatively connected to the weep openings in the top plate of the drain and the bottom end submerged below the surface of the liquid which fills the inner bowl are sealed to oppose sewer gas passage through the weep openings; wherein the improvement comprises liquid seal-protected weep holes with weep tubes.