Water closet with supplemented rim wash water flow

A water closet (1) comprising:

• a bowl (2) which includes an opening (3) for admitting flush water, a water and waste discharge (4), and sides (6) terminating in a bowl rim (7) having a water conveying passage (8) therein, a rim water inlet (11) into said passage and rim water outlet means (12) from said passage for washing said bowl sides;
• a tank means (14) for storing flush water at a full first level (WL1) whereat a substantial volume of said water will not flow by gravity into said rim and having a water inlet (15) for connection to a supply of water (16) under pressure and a flush water outlet (21) connected to said bowl flush water admitting opening;
• a water inlet valve means (23) mounted in flow control relation to said water inlet and movable between water inlet open and closed positions by a first water level sensing means (24) in response to the water level in said tank;
• a flush valve means (26) mounted in said tank and manually movable to an open position to permit discharge of water from said tank into said bowl and automatically movably by a flush valve closing means to a closed position after said water level in said tank drops;
• a rim water supply conduit means (31) including a longitudinal flow path, said conduit means connected in flow communication between said water inlet valve means and said rim water inlet;
• a flow control valve means (32) having a valve element mounted in said conduit movable between conduit open and closed positions;
• a tank water withdrawing means (40) including a high suction zone (42) below said rim inlet having an output (43) in fluid communication with said rim inlet and an aperture means (51) connecting said zone in fluid communication with said tank, said withdrawing means being automatically operative only when water is flowing through said rim passage during flushing to cause a portion of the water stored in said tank to be withdrawn for flow upward into said rim inlet during flushing so that stored tank water will supplement the volume of water flowing from said water inlet to said rim passage;
• and
• a second water level sensing means (61) including a float element having an adjustable connection to said valve element to move the latter between said conduit open and closed positions, said adjustable connection permitting the position of said float element to be regulated relative to the position of said valve element to cause said flow control valve means
• to be in said open position when said tank water level is at said first level and remains in said open position when said water level is falling to an intermediate level (INT) below said first level to permit water from said water inlet valve means, when open, to immediately flow through said conduit to said rim inlet;
• and
• to move to said closed position when said tank water level drops below said intermediate level to a second level and remains in said closed position when said water level is rising from said second level to said first level to enable flow to said rim passage to be stopped at any desired time after minimum rim wash requirements have been met to minimize the amount of water used for rim wash, and then cause water flowing from said water inlet to flow through said aperture means to refill said tank.