Abstract: The present invention is a flush water tank device including a flush water tank main body, a water supply valve, and a discharge valve, in which during a flush of the flush toilet, the discharge valve is opened until a water level in the flush water tank main body is lowered from a predetermined full water level to a predetermined dead water level, a lowering speed of the water level in the flush water tank main body changes at a predetermined inflection water level between the full water level and the dead water level, and the lowering speed of the water level between the inflection water level and the dead water level is faster than the lowering speed of the water level between the full water level and the inflection water level.

Abstract: A discharge valve device includes a valve body, an actuation shaft, a water storage cylinder, and a float, and from when the valve body opens to when the valve body closes, either flushing mode of a large flushing mode in which the flush water in a water storage tank is supplied from a discharge opening to the flush toilet in a first flush water amount or a small flushing mode in which the flush water is supplied in a second flush water amount smaller than the first flush water amount is selectively executable, and the water storage cylinder or the float is configured to change a lowering speed of the float with decrease in water level in the water storage cylinder depending on the selected large flushing mode or small flushing mode.

Abstract: A flush water supply device includes: a water supply unit including a water supply valve; a water compartment fittingly attached to the water supply unit; a float provided inside the water compartment; and a swingable member having one end connected to the float and the other end connected to the water supply valve, wherein the water compartment is formed in a flattened shape in which a maximum vertical length becomes less than a maximum horizontal length by a given value, and a ratio of a distance between the fulcrum adjacent to the water supply valve and an effort point defined by the swingable member and the float, to a distance between the fulcrum adjacent to the water supply valve and a load point defined by the swingable member and the water supply valve is set to a given value or more.

Abstract: A water discharge valve device includes: a water discharge valve unit which has a valve element for opening and closing a discharge port and a control casing for controlling an up-down movement of the valve element; a casing module which includes a peripheral wall extending upwardly from a bottom wall of a water storage tank while surrounding peripheries of the discharge port and the control casing of the water discharge valve unit, to define an upwardly open space therebetween, an opening formed to penetrate through the peripheral wall, and a switching valve attached to the peripheral wall and adapted to open and close the opening; and a communication port formed in a peripheral plane extending from the control casing of the water discharge valve unit to the discharge port, to provide fluid communication between the casing module and the discharge port.

Abstract: A discharge valve apparatus has control cylinder members for controlling the flow of rinse water flowing out from a reservoir tank discharge port, on which opening portions are formed, and flow-adjusting members attached to these control cylinder members are capable of adjusting the opening surface area of opening portions in the control cylinder member. Female engaging portions in the control cylinder member are arrayed approximately vertically, and are furnished with registration indentations for registering the attachment positions of adjusting members relative to the control cylinder members. Intervals within the registration indentations are set to be smaller than a width of an installer's finger to prevent release of engagement by an installer when the adjusting member male engaging portions are in a state of engagement with the female engaging portions of the control cylinder members.

Abstract: A flush water supply device includes: 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; a refill water system on a downstream side of the water supply valve and adapted to allow flush water to be supplied to the flush water tank, and further supplied to a toilet main body as refill water, wherein the refill water system includes a common passage-forming portion which forms a common passage having: an inlet port for allowing inflow of the flush water therethrough; a tank-side outlet port for allowing the flush water to flow out toward the flush water tank therethrough; a main unit-side outlet port for allowing the flush water to flow out toward the toilet main body therethrough; and a vent port; and a vacuum break valve in the common passage-forming portion.

Abstract: A flush water supply device includes: 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; a refill water system on a downstream side of the water supply valve and adapted to allow flush water to be supplied to the flush water tank, and further supplied to a toilet main body as refill water, wherein the refill water system includes a common passage-forming portion which forms a common passage having: an inlet port for allowing inflow of the flush water therethrough; a tank-side outlet port for allowing the flush water to flow out toward the flush water tank therethrough; a main unit-side outlet port for allowing the flush water to flow out toward the toilet main body therethrough; and a vent port; and a vacuum break valve in the common passage-forming portion.

Abstract: A water discharge valve device includes: a water discharge valve unit which has a valve element for opening and closing a discharge port and a control casing for controlling an up-down movement of the valve element; a casing module which includes a peripheral wall extending upwardly from a bottom wall of a water storage tankwhile surrounding peripheries of the discharge port and the control casing of the water discharge valve unit, to define an upwardly open space therebetween, an opening formed to penetrate through the peripheral wall, and a switching valve attached to the peripheral wall and adapted to open and close the opening; and a communication port formed in a peripheral plane extending from the control casing of the water discharge valve unit to the discharge port, to provide fluid communication between the casing module and the discharge port.

Abstract: The discharge valve apparatus of the present invention has control cylinder members for controlling the flow of rinse water flowing out from a reservoir tank discharge port, on which opening portions are formed, and flow-adjusting members, attached to these control cylinder members and capable of adjusting the opening surface area of opening portions in the control cylinder member; whereby female engaging portions in the control cylinder member are arrayed approximately vertically, and are furnished with registration indentations for registering the attachment positions of adjusting members relative to control cylinder members, and the intervals within the registration indentations are set to be smaller than the width of an installer's finger to prevent release of engagement by an installer when the adjusting member male engaging portions are in a state of engagement with the female engaging portions of the control cylinder members.

Abstract: The present invention provides a toilet bowl flushing water tank device which can largely open a discharge valve element instantaneously and, at the same time, can ensure a relatively large space in the vicinity of a discharge valve device thus enhancing a discharge capacity with a small power. A push button mounted on a tank lid body of a flushing water tank body is arranged at a position offset to one side from a position where a discharge opening is formed, a leverage device is constituted of a lever which is interlockingly connected to the discharge valve element and a pedestal which pivotally supports a middle portion of the lever. The pedestal pivotally supports a middle portion of the lever at a position closer to a push button side than the discharge valve device.

Abstract: The present invention provides a toilet bowl flushing water tank device which can largely open a discharge valve element instantaneously and, at the same time, can ensure a relatively large space in the vicinity of a discharge valve device thus enhancing a discharge capacity with a small power. A toilet bowl flushing water tank device includes a flushing water tank body forming a discharge opening in a center portion thereof, a discharge valve device for vertically moving a discharge valve element relative to the discharge opening, the discharge valve device being mounted and housed in the flushing water tank body, a leverage device being interlockingly connected to the discharge valve device, the leverage device being mounted and housed in the flushing water tank body, and a push button being interlockingly connected to the leverage device in the flushing water tank body, the push button mounted on a tank lid body of the flushing water tank body.