Patent ID: 9745729
Date: 2017-08-29
CPC Classifications: E03D

Claim:
1. A flush water tank assembly for supplying flush water to a toilet main unit, comprising: a flush water tank storing therein flush water to be supplied to the toilet main unit and having a water discharge port provided in a bottom wall thereof; a water supply unit which comprises a water supply pipe having an upstream end connected to a water supply source outside the flush water tank, and a water supply valve for switching between a water supplying state and a water stopping state with respect of an inside of the flush water tank, in terms of flush water supplied from the water supply pipe; a water compartment attached to the water supply unit and configured to hold therein flush water; an openable and closable valve for opening and closing an opening formed in a lateral wall or a bottom wall of the water compartment; a float provided inside the water compartment in such a manner to define therein an internal space for generating buoyancy and become movable upwardly and downwardly according to change in water level within the water compartment, and configured such that, when the water compartment is in an empty state, air is reversibly replaceable between the internal space and a space outside the float; a swingable member having one end connected to the float and the other end connected to the water supply valve of the water supply unit, the swingable member being configured to open and close the water supply valve according to the upward and downward movements of the float; a water discharge valve provided to operatively open and close the water discharge port of the flush water tank, in such a manner as to, when it opens the water discharge port, cause flush water in the flush water tank to be discharged to the toilet main unit, and, when it closes the water discharge port, cause flush water to be stored in the flush water tank; and drainable water increasing means including an auxiliary float element configured to be moved upwardly and downwardly according to change in water level within the water compartment to thereby cause the openable and closable valve to be opened and closed, wherein the drainable water increasing means, after the water level within the water compartment passes through a water level position at a time when or after the water discharge valve closes the water discharge port, increases a speed of lowering of the water level within the water compartment to thereby increase a flow rate of flush water drainable from the opening of the water compartment into the flush water tank.