Patent ID: 6256801
Filing Date: 2001-07-10
Classification: E03D,Y10T

Abstract:
A siphon assembly for a flushing cistern, said assembly including an inverted generally U shaped duct having an up leg and a down leg, the up leg being provided with an enlarged chamber having a lower end open to the interior of the cistern in use and the down leg forming an outlet from the cistern in use for delivery of flushing water; and a vertically displaceable piston incorporating a flexible diaphragm acting as a one way valve, said piston being movable in said chamber to initiate a siphonic flushing action operatively discharging water through said duct from the cistern; a side wall of the chamber defining a venting aperture intermediate the top of the chamber and said lower open end, the assembly further including a first closure element with a first edge facing vertically in one direction that abuts to a second edge on the side wall of the chamber that faces vertically and oppositely to the one direction with the first closure element in engagement with the venting aperture, the first and second edges in abutting relationship maintaining the first closure element consistently in a predetermined vertical relationship relative to the side wall of the chamber, the first closure element being shaped so that the first closure element has a third edge which is located to define at least a first predetermined flush level at the third edge on the first closure element lower than a top edge of the venting aperture with the first closure element in the predetermined position.