Toilet flush system

Claim 1

In a two-level flush mechaNism for water closet flushing tanks which comprises (A) a holding tank, (B) means for filling this tank with water to a predetermined level, (C) a flush control, (D) means including (D1) a static valve seat and (D2) a moving valve device for rapidly discharging a minor predetermined volume of water from said tank in response to a first mode of actuation of said control, (E) means for rapidly discharging a major predetermined volume of water therefrom in response to a second mode of actuation of said control, THE IMPROVEMENT CHARACTERIZED BY THE FOLLOWING ELEMENTS AND INTERRELATIONS: FIRST that said moving valve device comprises (1a) a lower hinged flat type valving portion co-acting with said valve seat to control the beginning and termination of said discharges, (1b) an adjustably fixed upper floater-sinker portion located a preselected amount higher than said valving portion, whereby the difference between said major and minor predetermined volumes is adjustable, an interconnecting portion comprising a stem hingedly affixed to said valving portion, said interconnecting portion joining said upper and lower portions in such relation that said portions rise and fall together; SECOND that the combined weight of said three portions is sufficiently less than their total flotation lift to make the overall buoyancy of the moving valve device safely positive, whereby the valve is held open in spite of dynamic flow forces when both upper and lower portions are submerged; THIRD that said combined weight is sufficiently greater than the flotation lift of the lower and interconnecting portions to make the overall buoyancy operatively negative when the water level is below said upper portion, whereby said negative buoyancy tends to reclose the valve and terminate the discharge; FOURTH that said flushing control is of the class which holds the valve open as long as it is held actuated by the use, whereby a user can select a minor discharge by actuation of the control in the usual brief-actuation-and-release mode or can select a major discharge by actuating the control and holding it actuated until the discharge has ceased.