Primer activated wet leg-control vented low level syphon flush for toilets

A primer tank activated syphon flusher for toilets having a flush tank and a flush pipe opening into a toilet bowl, and having a water level control means responsive to depletion of water in said flush tank to refill said primer tank and said flush tank to predetermined water levels, and including;

• a syphon within the flush tank and comprised of a suction leg opening within the bottom of the flush tank and extending upward to a bridge substantially above the aforesaid predetermined waterlevel, and a discharge leg continuing from the suction leg and extending downward from the bridge and discharging through a jet opening and into the flush pipe,
• a header spaced above the bridge to define a closed transfer passage connecting the suction leg and discharge leg of the syphon, there being a breather passageway communicating the transfer passage so as to allow air flow to the atmosphere external of the tank and bowl while permitting free exhaust of air for refilling the two legs of the syphon,
• the primer tank being passively closed at a bottom discharge opening into the flush pipe by a flush valve seated on said flush pipe, and closed at its top to outside atmosphere by a header, there being a vent-control means for restricting air flow into the primer tank to permit refilling with primer water and to create a partial vacuum to retard discharge of said primer water,
• and means for opening the flush valve to initiate syphoning by discharge of primer water over the jet opening for inducing a suction effect causing suction leg water to rise over the bridge from said predetermined water level and into the discharge leg and from said jet opening into the flush pipe, and continuing until the flush tank water is depleted.