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US 4,305,163 AGranted
Toilet bowl flush system
AssigneeBen-Gurion University of the Negev Research and Development Authority
InventorZeev Raz
Life of this patent
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AssigneeBen-Gurion University of the Negev Research and Development Authority
InventorZeev Raz
Estimating the term…
A flush valve mechanism for controlling the flushing action of water thro the water outlet of a flush cistern is provided. The mechanism comprises a water outlet valve liftable off the water outlet to effect the flushing action and a buoyant, valve-engaging assembly adapted to move independently of the water outlet valve by virtue of its buoyancy. The water outlet valve having an effectively negative overall buoyancy when the cistern is at least partially full. The valve-engaging assembly comprises a pivotably mounted buoyant lever having at least one arm with a buoyant means attached at one end thereof adjacent the bottom of the cistern and is provided with means at its other end for selectively engaging the valve. The assembly further comprises restraining means having a first position normally engaging and restraining the buoyant lever with the buoyant means in close proximity to the cistern bottom and the engaging means in disengaged relationship to the valve. The restraining means are displaceable to assume a second position freeing the buoyant lever and allowing the same to engage and to exert a maintaining force on the water outlet valve at the completion of the lifting thereof to overcome its negative buoyancy and to hold it open until the completion of the flushing action.
A flush valve mechanism for controlling the flushing action of water through the water outlet of a flush cistern comprising a water outlet valve liftable off said water outlet to effect said flushing action and a buoyant, valve-engaging assembly adapted to move independently of said water outlet valve by virtue of its buoyancy, said water outlet valve having an effectively negative overall buoyancy when the cistern is at least partially full, and said assembly comprising a pivotably mounted buoyant lever having at least one arm with a buoyant means attached at one end thereof adjacent the bottom of said cistern and provided with means at its other end for selectively engaging said valve, said assembly further comprising restraining means being displaceable between a first position and a second position, said restraining means in said first position normally engaging and restraining said buoyant lever with said buoyant means in close proximity to said cistern bottom and said engaging means in disengaged relationship to said valve, said restraining means in said second position freeing said buoyant lever and allowing the same to engage and to exert a maintaining force on said water outlet valve at the completion of the lifting thereof to overcome its negative buoyancy and to hold it open until the completion of the flushing action.
Dependencies are inferred from the claim text.