Nozzle flush system

Claim 1

Apparatus for flushing a toilet bowl of the type having a substantially horizontally disposed rim, a drain outlet located vertically below said rim and a smooth interior surface between said rim and drain outlet, said apparatus comprising in combination: liquid nozzle means having an inlet and an outlet, said nozzle means being disposed adjacent the rim of said bowl so that liquid discharged from said nozzle means will impinge upon all portions of the interior surface of said bowl, manually operable liquid flow control means including an outlet, conduit means for connecting said control means outlet to said inlet of said nozzle means, said flow control means having a flow passage of predetermined cross-sectional area and valve means for closing said flow passage, said valve means being manually movable to open said flow passage and movable to close said flow passage in response to a drop in pressure in said flow passage, said control means including a pressure chamber, an inlet connecting said pressure chamber to a source of liquid under pressure, and means for restricting the flow of liquid from the source to said pressure chamber so that, when said valve means is moved to open said flow passage, a predetermined quantity of liquid will discharge from said pressure chamber to said nozzle means causing a pressure drop sufficient to result in the closing of said flow passage by said valve means before pressure in said pressure chamber is restored by flow from the liquid source, said means for restricting the flow of liquid from the liquid source to said pressure chamber comprises an inlet orifice having one side communicating directly with said liquid source and its other side communicating directly with said pressure chamber, said means connecting said pressure chamber to the liquid source having a predetermined cross-sectional area and said pressure chamber having a predetermined cross-sectional area, said inlet orifice having a cross-sectional area that is substantially dimensionally smaller than said predetermined cross-sectional areas of said pressure chamber and said means connecting said pressure chamber to the liquid source, said inlet orifice including means for adjusting the cross-sectional area thereof to vary the rate of liquid flow therethrough, said pressure chamber having a vertical axis, an upper end portion and a lower end portion, said means connecting said pressure chamber to a source of liquid under pressure comprising an inlet located between said upper and lower end portions, and said inlet of said flush valve being connected to said lower end portion of said pressure chamber so that, when said pressure chamber is filling with liquid, any atmospheric gases in said pressure chamber will be compressed in said upper end portion thereof to a pressure substantially equal to the pressure of said liquid source.