Patent ID: 6173456
Filing Date: 2001-01-16
Classification: E03D

Abstract:
A double-cistern water-conserving sanitary water tank system comprising:an external oval tank having a side walls and a bottom wall, and approximately a 6 liter capacity, a first water entrance valve in the bottom wall of said external oval tank, an elbow-shaped water outlet extending through the side wall of said oval tank and having a first end with a first outlet valve terminating inside the oval tank, two handles extending through the side wall of said external oval tank for flushing the system and;an internal round tank having a side wall and a bottom wall mounted within said external oval tank at a level above the bottom wall of said external oval tank and having approximately a 4 liter capacity, a segment of the side wall of said internal round tank being integrally formed with the side wall of said external oval tank, a second water entrance valve in the bottom wall of said internal round tank, a vertical water outlet having two ends, one end attached to a second outlet valve at the bottom wall of said internal round tank, said first and second outlet valves operationally connected to said handles, respectively, an intermediate portion of the vertical water outlet attached to a second end of the elbow-shaped water outlet exterior of said external oval tank, a notch formed in the side and bottom walls of said internal round tank to give more opening space to the first outlet valve.