Patent ID: 6823534
Filing Date: 2004-11-30
Classification: E03D

Abstract:
Dual flush apparatus for a toilet having a water tank with a discharge port for flushing water into a toilet bowl, the apparatus comprising:a buoyant flush valve for releasably sealing said discharge port and having a cavity for entrapping air to cause the flush valve to remain open after unseating of the flush valve from said discharge port, the flush valve having a weight for causing seating of the flush valve on said discharge port after flushing of water through said discharge port; and a control mechanism configured for mounting to said water tank, said control mechanism comprising: a handle; lever means, interconnecting said handle and the flush valve, for unseating the flush valve from said discharge port; and an air valve, connected to said handle and pneumatically connected to the flush valve, for venting entrapped air in the flush valve cavity at a selected water level within said water tank, said air valve comprising: a body having an inlet and an outlet; a rotor disposed within said body and including a slot therein for pneumatically connecting the inlet and the outlet upon rotation of said rotor; and a rotor driver for rotating the rotor in order to alternatively align the slot over the inlet and outlet to provide the pneumatic connection and not align the slot over the inlet and outlet to prevent pneumatic connection.