Dual flush toilet mechanism

Claim 1

A mechanism adapted to be installed in a tank type toilet which is operable at one stage to flush a portion the water held in the cistern down the cistern drain and into the toilet bowl, and at a second stage, to flush substantially all the water held in the cistern into the toilet bowl, which mechanism comprises a drain tube extending upwardly in the cistern and having an annular flange near the upper end thereof, a toroidal float disposed about the lower end of said drain tube, said float having an air chamber thereIn and defining an annular sealing member about the lower portion of the float, said sealing member being adapted to abut the cistern drain, whereby the water pressure against the float forms a seal between the float and cistern drain, a buoyant cover pivotally secured on the upper end of said drain tube thereby preventing water flow therethrough, a fastening member carried by said buoyant cover and adapted to be secured to a toilet lifting chain, a bifurcated lifting assembly adapted to be secured to said chain, said assembly having a pair of leg portions and carrying an arcuate catch member at the lower end of each leg portion, said arcuate catch members being adapted to fit about said drain tube and slide there along so that upon raising the toilet chain to a first stage, the buoyant cover is pivoted upwardly on the drain tube and upon continued raising of the chain to a second stage, said catch members abut said annular flange on said drain tube and lift said drain tube and toroidal float from the cistern drain.