Water stopper for toilet tanks

Abstract

A water stopper for a toilet tank to allow fine-tune adjustment of water flushing amount of the toilet tank includes at least a cap, a dome and an adjustment strut that are incorporated with a stopping gasket and a washer. The dome is a hollow semi-sphere coupled on the bottom of the cap and turnable, and has a water inlet at the bottom thereof and an air vent at one side. It further has features as follow: the cap has a coupling portion on the bottom to fasten to one end of the adjustment strut. The adjustment strut has a stopping disc at other end. The stopping disc has an aperture corresponding to the water inlet of the dome. By turning the dome, the water inlet and the aperture of the stopping disc can be overlapped at a desired ratio, thereby water entering speed into the dome can be fine tuned to control water flushing amount of the toilet tank.

1 . A water stopper for a toilet tank, comprising a cap, a dome and an adjustment strut incorporating with a stopping gasket and a washer, wherein:
 the cap is a circular tray formed at a size slightly larger than a drain port of the toilet tank and has a plurality of retaining flanges protruding from the bottom thereof to hold the stopping gasket and the washer; and   the dome is a hollow semi-sphere coupling on the perimeter of the retaining flanges and has a water inlet at the bottom thereof and an air vent at one side;   wherein:   the cap further has a coupling portion at the bottom thereof;   the water inlet has the center thereof formed on an inner bottom side of the dome and eccentric from the center line of the dome; and   the adjustment strut has one end fastened to the coupling portion of the cap and another end formed a stopping disc in contact with the inner bottom side of the dome, the stopping disc having an aperture corresponding to the water inlet of the dome.   
   
   
       2 . The water stopper for a toilet tank of  claim 1 , wherein the dome has at least one torsional groove formed on the surface thereof to facilitate grasping of users for turning the dome.