Washing water tank device and water washing toilet device equipped with the same

Abstract

To provide a wash water tank device capable of setting a quantity of wash water to be discharged accurately while opening a drain valve by a drain valve hydraulic driving unit; and a flush toilet bowl device having the same.SOLUTION: A wash water tank device comprises a drain valve hydraulic driving unit 14, a clutch mechanism 30, wash water quantity selection means 6, a timing control mechanism 46, and a valve control part. In the valve control part, when a first wash water quantity is selected, the timing control mechanism is engaged with a drain valve and at a lapse of first time the timing control mechanism is operated to cancel the engagement of the timing control mechanism 46 with the drain valve 12, and when a second wash water quantity is selected, the timing control mechanism is engaged with the drain valve and at a lapse of second time shorter than the first time the timing control mechanism 46 is operated to cancel the engagement of the timing control mechanism 46 with the drain valve 12.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a washing water tank device, and particularly to a washing water tank device for supplying washing water to a flush toilet, and a flush toilet device equipped with the same.

Background Art

[0002] Japanese Patent Application Laid-Open No. 2009-257061 (Patent Document 1) describes a rotary tank device. In this rotary tank device, a hydraulic cylinder device having a piston and a drain part is disposed inside a rotary tank equipped with a drain valve, and the piston and the drain valve are connected by a connecting part. Further, when discharging the washing water in the rotary tank, by opening the solenoid valve, water is supplied to the hydraulic cylinder device to push up the piston. Since the piston is connected to the drain valve by the connecting part, the drain valve is pulled up by the movement of the piston, the drain valve is opened, and the washing water in the rotary tank is discharged. The water supplied to the hydraulic cylinder device flows out from the drain part and flows into the rotary tank.

[0003] Furthermore, when closing the drain valve, by closing the solenoid valve, the supply of water to the hydraulic cylinder device is stopped. As a result, the pushed-up piston descends, and accordingly, the drain valve returns to the closed position by its own weight. At this time, since the water in the hydraulic cylinder device flows out little by little from the drain part, the piston descends slowly, and the drain valve also slowly returns to the closed position. Also, in the rotary tank device described in Patent Document 1, by adjusting the time for keeping the solenoid valve open, the time for which the drain valve is open is changed, thereby realizing washing with different washing water amounts such as large washing and small washing.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, the rotary tank device described in Patent Document 1 has a problem that it is difficult to precisely set the amount of washing water to be discharged. That is, in the rotary tank device described in Patent Document 1, after closing the solenoid valve to close the drain valve, the water in the hydraulic cylinder device gradually flows out from the drain part, so the piston descends gently, and it is difficult to set the opening time of the drain valve short. In addition, since the descending speed of the piston depends on the outflow rate of water from the drain part and the sliding resistance of the piston, there may be variations and there may be changes over time. Therefore, it is difficult to precisely set the amount of washing water to be discharged in the rotary tank device described in Patent Document 1.

[0006] Therefore, an object of the present invention is to provide a washing water tank device capable of precisely setting the amount of washing water to be discharged while opening a drain valve by utilizing the water pressure of the supplied water, and a flushing toilet device equipped with the same.

Means for Solving the Problems

[0007] In order to solve the above-described problems, an embodiment of the present invention is a washing water tank device that supplies washing water to a flush toilet, the washing water tank device including: a water storage tank that stores the washing water to be supplied to the flush toilet and has a drain port formed therein for discharging the stored washing water to the flush toilet; a drain valve that opens and closes the drain port and supplies and stops the supply of washing water to the flush toilet; a drain valve hydraulic pressure drive unit that drives the drain valve using the water supply pressure of the supplied tap water; a clutch mechanism that connects the drain valve and the drain valve hydraulic pressure drive unit, pulls up the drain valve by the driving force of the drain valve hydraulic pressure drive unit, and is disconnected at a predetermined timing to lower the drain valve; washing water amount selection means for selecting a first washing water amount for washing the flush toilet and a second washing water amount that is less than the first washing water amount; a timing control mechanism for stopping the descent of the drain valve while engaged with the drain valve and controlling the timing at which the drain port is closed; and a valve control unit that is connected to the timing control mechanism and is provided to operate at a timing corresponding to the washing water amount selected by the washing water amount selection means. When the first washing water amount is selected by the washing water amount selection means, the valve control unit causes the timing control mechanism to engage with the drain valve and operates the timing control mechanism so that the engagement between the timing control mechanism and the drain valve is released after the elapse of a first time, and the drain valve is lowered after the elapse of the first time. When the second washing water amount is selected by the washing water amount selection means, the valve control unit causes the timing control mechanism to engage with the drain valve and operates the timing control mechanism so that the engagement between the timing control mechanism and the drain valve is released after the elapse of a second time that is shorter than the first time, and the drain valve is lowered after the elapse of the second time. The washing water tank device is characterized by including the valve control unit. According to one embodiment of the present invention configured as described above, since the drain valve and the drain valve hydraulic drive unit are connected by a clutch mechanism and disconnected at a predetermined timing, it is possible to move the drain valve regardless of the operating speed of the drain valve hydraulic drive unit, and the drain valve can be closed. Thus, even if there is a variation in the operating speed of the drain valve hydraulic drive unit when lowering the drain valve, it is possible to control the timing to close the drain valve without being affected by the variation. Further, when the first washing water amount is selected by the washing water amount selection means, the valve control unit engages the timing control mechanism with the drain valve, and operates the timing control mechanism so that the engagement between the timing control mechanism and the drain valve is released after the elapse of the first time. When the second washing water amount is selected by the washing water amount selection means, the valve control unit engages the timing control mechanism with the drain valve, and operates the timing control mechanism so that the engagement between the timing control mechanism and the drain valve is released after the elapse of the second time, which is shorter than the first time. In this way, when the second washing water amount is selected by the washing water amount selection means, the valve control unit can operate the timing control mechanism so that the timing to close the drain port is earlier than when the first washing water amount is selected. Therefore, according to one embodiment of the present invention, the first and second washing water amounts can be set while using the clutch mechanism.

[0008] In one embodiment of the present invention, preferably, it is a washing water tank device for supplying washing water to a flush toilet, which stores the washing water to be supplied to the flush toilet and has a water storage tank formed with a drain port for discharging the stored washing water to the flush toilet, a drain valve for opening and closing the drain port and supplying and stopping the washing water to the flush toilet, a drain valve hydraulic pressure driving unit for driving the drain valve using the water supply pressure of the supplied tap water, a clutch mechanism for connecting the drain valve and the drain valve hydraulic pressure driving unit to lift the drain valve by the driving force of the drain valve hydraulic pressure driving unit and lower the drain valve by being disconnected, a first washing water amount for washing the flush toilet, a washing water amount selection means capable of selecting a second washing water amount smaller than the first washing water amount, and a valve control unit formed so as to be able to disconnect the clutch mechanism at a predetermined timing, wherein the valve control unit operates to disconnect the clutch mechanism after the elapse of a first time when the first washing water amount is selected by the washing water amount selection means and lower the drain valve after the elapse of the first time, and the valve control unit operates to disconnect the clutch mechanism after the elapse of a second time shorter than the first time when the second washing water amount is selected by the washing water amount selection means and lower the drain valve after the elapse of the second time. According to an embodiment of the present invention configured as described above, since the drain valve and the drain valve hydraulic drive unit are connected by a clutch mechanism and disconnected at a predetermined timing, it becomes possible to move the drain valve regardless of the operating speed of the drain valve hydraulic drive unit, and the drain valve can be closed. Further, when the first washing water amount is selected by the washing water amount selection means, the valve control unit is operated to disconnect the clutch mechanism after the elapse of the first time, and the drain valve is lowered after the elapse of the first time. When the second washing water amount is selected by the washing water amount selection means, the valve control unit is operated to disconnect the clutch mechanism after the elapse of the second time, which is shorter than the first time, and the drain valve is lowered after the elapse of the second time. Thus, when the second washing water amount is selected by the washing water amount selection means, the valve control unit can disconnect the clutch mechanism so that the timing at which the drain port is blocked is earlier than when the first washing water amount is selected. Therefore, according to an embodiment of the present invention, while using the clutch mechanism, the drain valve can be lowered after the elapse of a predetermined time, and the first and second washing water amounts can be set.

[0009] In one embodiment of the present invention, preferably, further, a control valve provided in a flow path for supplying washing water to the valve control unit and controlling the supply of washing water to the valve control unit, and a control unit for controlling the control valve are provided, and the valve control unit is formed to be operated by the supplied washing water. According to an embodiment of the present invention configured as described above, the control unit is provided to control the control valve, and the valve control unit is operated by the washing water supplied from the control valve. Thereby, with a relatively compact and simple configuration, while using the clutch mechanism, the drain valve can be lowered after the elapse of a predetermined time, and the first and second washing water amounts can be set.

[0010] In one embodiment of the present invention, preferably, after the drain valve hydraulic drive unit raises the drain valve, the supply of washing water from the control valve to the valve control unit is started. According to an embodiment of the present invention configured as described above, without inhibiting the operation of raising the drain valve by the wash water, with a relatively compact and simple configuration, while using a clutch mechanism, the drain valve can be lowered over a predetermined time, and the first and second wash water amounts can be set.

[0011] In one embodiment of the present invention, preferably, the control valve is provided to also control the supply of wash water to the drain valve hydraulic drive unit. According to an embodiment of the present invention configured as described above, since the control valve is provided to also control the supply of wash water to the drain valve hydraulic drive unit, with a relatively compact and simple configuration, while using a clutch mechanism, the drain valve can be lowered over a predetermined time, and the first and second wash water amounts can be set.

[0012] In one embodiment of the present invention, preferably, the control valve supplies wash water to the valve control unit via the drain valve hydraulic drive unit. According to an embodiment of the present invention configured as described above, with a relatively compact and simple configuration, it is possible to suppress the generation of relatively wasted wash water that cannot contribute to the operation of either the drain valve hydraulic drive unit or the valve control unit in the wash water supplied from the control valve, and the wash water can be effectively used in the drain valve hydraulic drive unit and the valve control unit.

[0013] In one embodiment of the present invention, preferably, the valve control unit is a water storage unit that stores wash water, and the water storage unit has a discharge hole formed at the lower part thereof for discharging the stored wash water, a discharge unit that discharges wash water into the water storage unit, and a float provided in the water storage unit that moves up and down according to the water level in the water storage unit. The timing control mechanism includes an engaging portion that can engage with the drain valve according to the position of the float. When wash water is stored in the water storage unit and the float is rising, the timing control mechanism arranges the engaging portion at a position where it can engage with the drain valve, and when the float is descending, the timing control mechanism moves the engaging portion to a position where the engagement with the drain valve is released. According to one embodiment of the present invention configured as described above, when the cleaning water is stored in the water storage portion and the float is raised, the timing control mechanism arranges the engaging portion at a position where it can engage with the drain valve. When the float descends, the timing control mechanism moves the engaging portion to a position where the engagement with the drain valve is released. By using the water storage portion and the float provided in the water storage portion in this way, the influence of variations in the flow rate of the cleaning water supplied to the water storage portion is suppressed, and the operation of a relatively stable timing control mechanism can be realized with a relatively simple configuration. Therefore, according to one embodiment of the present invention, the first and second cleaning water amounts can be set relatively stably while using a clutch mechanism.

[0014] In one embodiment of the present invention, preferably, after the clutch mechanism is disengaged, the supply of cleaning water from the control valve to the valve control unit is started. According to one embodiment of the present invention configured as described above, without inhibiting the operation of raising the drain valve by the cleaning water in the drain valve hydraulic drive unit, with a relatively compact and simple configuration, while using a clutch mechanism, the drain valve is lowered after a predetermined time has elapsed, and the first and second cleaning water amounts can be set.

[0015] In one embodiment of the present invention, preferably, the drain valve hydraulic drive unit is disposed separately from the drain valve casing outside the drain valve casing that arranges the drain valve inward, and the clutch mechanism is disposed at a position on the side of the drain valve hydraulic drive unit among the positions from the drain valve hydraulic drive unit to the drain valve casing. According to one embodiment of the present invention configured as described above, the drain valve hydraulic drive unit is disposed separately from the drain valve casing outside the drain valve casing that arranges the drain valve inward, and the clutch mechanism is disposed at a position on the side of the drain valve hydraulic drive unit among the positions from the drain valve hydraulic drive unit to the drain valve casing. Thereby, the clutch mechanism can be disposed at a position on the side of the drain valve hydraulic drive unit among the positions between the drain valve casing and the drain valve hydraulic drive unit, and the degree of freedom in setting the position where the clutch mechanism is disengaged and the degree of freedom in arranging the clutch mechanism can be improved.

[0016] Also, a flush toilet device according to an embodiment of the present invention includes a cleaning water tank device of the present invention and a flush toilet that is cleaned with the cleaning water supplied from this cleaning water tank device.

Effects of the Invention

[0017] According to the present invention, it is possible to provide a cleaning water tank device capable of precisely setting the amount of cleaning water to be discharged while opening the drain valve by the drain valve water pressure driving unit, and a flush toilet device equipped with the same.

Brief Description of the Drawings

[0018]

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Embodiments for Carrying Out the Invention

[0019] Next, with reference to the accompanying drawings, a flushing toilet device according to a first embodiment of the present invention will be described. FIG. 1 is a perspective view showing an entire flushing toilet device provided with a washing water tank device according to a first embodiment of the present invention. FIG. 2 is a sectional view showing a schematic configuration of the washing water tank device according to the first embodiment of the present invention.

[0020] As shown in FIG. 1, a flushing toilet device 1 according to a first embodiment of the present invention is composed of a flushing toilet main body 2 which is a flushing toilet, and a washing water tank device 4 according to an embodiment of the present invention placed at the rear part of the flushing toilet main body 2. The flushing toilet main body 2 is washed by the washing water supplied from the washing water tank device 4. The flushing toilet device 1 of the present embodiment is configured such that after use, by operating a remote control device 6 attached to the wall surface or after a human sensor 8 provided on the toilet seat detects the user's leaving the seat and a predetermined time has elapsed, the bowl part 2a of the flushing toilet main body 2 is washed. The washing water tank device 4 according to the present embodiment is configured to discharge the washing water stored inside to the flushing toilet main body 2 based on an instruction signal from the remote control device 6 or the human sensor 8, and wash the bowl part 2a with this washing water.

[0021] In addition, "large cleaning" or "small cleaning" for cleaning the bowl portion 2a is executed by the user pressing the push button 6a of the remote control device 6. Therefore, in the present embodiment, the remote control device 6 functions as a cleaning water volume selection means capable of selecting a first cleaning water volume for cleaning the water closet main body 2 and a second cleaning water volume less than the first cleaning water volume. As a modification, the remote control device 6 may be configured as a cleaning water volume selection means capable of changing the cleaning water volume to other predetermined settings, or may be configured as a cleaning water volume selection means capable of arbitrarily changing the cleaning water volume. In the present embodiment, the human sensor 8 is provided on the toilet seat, but the present invention is not limited to this form, and it may be provided at a position where it can detect the user's sitting, getting up, approaching, leaving, or raising a hand. For example, it can also be provided on the water closet main body 2 or the cleaning water tank device 4. Further, the human sensor 8 may be any sensor that can detect the user's sitting, getting up, approaching, leaving, or raising a hand. For example, an infrared sensor or a microwave sensor can be used as the human sensor 8. In addition, the remote control device 6 may be changed to an operation lever device or an operation button device having a structure capable of mechanically controlling the opening and closing of the first control valve 16 and the second control valve 22 described later.

[0022] As shown in Fig. 2, the wash water tank device 4 includes a water storage tank 10 for storing wash water to be supplied to the wash toilet body 2, a drain valve 12 for opening and closing a drain port 10a provided in the water storage tank 10, and a drain valve hydraulic drive unit 14 for driving the drain valve 12. The wash water tank device 4 also has a first control valve 16 for controlling the water supply to the drain valve hydraulic drive unit 14 and a solenoid valve 18 attached to the first control valve 16 inside the water storage tank 10. Further, the wash water tank device 4 has a second control valve 22 for supplying wash water to the water storage tank 10 and a solenoid valve 24 attached to the second control valve 22 inside the water storage tank 10. Furthermore, the wash water tank device 4 has a clutch mechanism 30 which connects the drain valve 12 and the drain valve hydraulic drive unit 14 and pulls up the drain valve 12 by the driving force of the drain valve hydraulic drive unit 14. Above the drain valve 12, a casing 13 is formed, and the casing 13 is formed in a cylindrical shape with an open lower side. The casing 13 is connected and fixed to the drain valve hydraulic drive unit 14 and the discharge part 54.

[0023] The water storage tank 10 is a tank configured to store wash water to be supplied to the wash toilet body 2, and a drain port 10a for discharging the stored wash water to the wash toilet body 2 is formed at the bottom thereof. Also, inside the water storage tank 10, an overflow pipe 10b is connected to the downstream side of the drain port 10a. The overflow pipe 10b rises vertically from the vicinity of the drain port 10a and extends above the full water level WL of the wash water stored in the water storage tank 10. Therefore, the wash water flowing in from the upper end of the overflow pipe 10b bypasses the drain port 10a and directly flows out to the wash toilet body 2.

[0024] The drain valve 12 is a valve body arranged to open and close the drain port 10a. When the drain valve 12 is pulled upward, it opens, and the washing water in the water storage tank 10 is discharged into the toilet body 2, and the bowl part 2a is washed. The drain valve 12 supplies and stops the washing water to the toilet body 2. Further, the drain valve 12 is pulled upward by the driving force of the drain valve hydraulic driving part 14. When it is pulled up to a predetermined height, the clutch mechanism 30 is disengaged, and it descends due to its own weight. When the drain valve 12 descends, the drain valve 12 is held for a predetermined time by a holding mechanism 46 described later, and the time until the drain valve 12 seats on the drain port 10a is adjusted.

[0025] The drain valve hydraulic driving part 14 is configured to drive the drain valve 12 by using the water supply pressure of the tap water (washing water) supplied from the water supply. Specifically, the drain valve hydraulic driving part 14 includes a cylinder 14a into which the washing water supplied from the first control valve 16 flows, a piston 14b slidably arranged in the cylinder 14a, and a rod 32 protruding from the lower end of the cylinder 14a to drive the drain valve 12.

[0026] Furthermore, a spring 14c is arranged inside the cylinder 14a, biasing the piston 14b downward. Also, a packing 14e is attached to the piston 14b to ensure the watertightness between the inner wall surface of the cylinder 14a and the piston 14b. Further, a clutch mechanism 30 is provided at the lower end of the rod 32, and the rod 32 and the valve shaft 12a of the drain valve 12 are connected and disengaged by this clutch mechanism 30.

[0027] The cylinder 14a is a cylindrical member, arranged with its axis in the vertical direction and slidably receiving the piston 14b inside. Also, a driving part water supply passage 34a is connected to the lower end part of the cylinder 14a, and the washing water flowing out from the first control valve 16 flows into the cylinder 14a. For this reason, the piston 14b in the cylinder 14a is pushed up by the washing water flowing into the cylinder 14a against the biasing force of the spring 14c.

[0028] On one hand, an outflow hole is provided at the upper part of the cylinder 14a, and the drive unit drain passage 34b communicates with the inside of the cylinder 14a through this outflow hole. Therefore, when cleaning water flows into the cylinder 14a from the drive unit water supply passage 34a connected to the lower part of the cylinder 14a, the piston 14b is pushed upward from the lower part of the cylinder 14a at the first position. The piston 14b is driven by the pressure of the cleaning water flowing into the cylinder. When the piston 14b is pushed up to the second position above the outflow hole, the water flowing into the cylinder 14a flows out from the outflow hole through the drive unit drain passage 34b. That is, when the piston 14b is moved to the second position, the drive unit water supply passage 34a and the drive unit drain passage 34b are communicated with each other through the inside of the cylinder 14a. A discharge part 54 is formed at the tip of the drive unit drain passage 34b extending from the cylinder 14a. Thus, the drive unit drain passage 34b forms a flow path extending to the discharge part 54.

[0029] The rod 32 is a rod-shaped member connected to the lower surface of the piston 14b and extends downward from the inside of the cylinder 14a through a through hole 14f formed in the bottom surface of the cylinder 14a. The rod 32 is connected to the piston 14b and drives the drain valve 12. Also, a gap 14d is provided between the rod 32 protruding from below the cylinder 14a and the inner wall of the through hole 14f of the cylinder 14a, and a part of the cleaning water flowing into the cylinder 14a flows out from this gap 14d. The water flowing out from the gap 14d flows into the water storage tank 10. Since this gap 14d is relatively narrow and the flow path resistance is large, even when water is flowing out from the gap 14d, the pressure inside the cylinder 14a rises due to the cleaning water flowing into the cylinder 14a from the drive unit water supply passage 34a, and the piston 14b is pushed up against the biasing force of the spring 14c.

[0030] Next, the first control valve 16 is configured to control the supply of cleaning water to the drain valve hydraulic drive unit 14 based on the operation of the solenoid valve 18, and also to control the water supply and stop to the discharge unit 54. Therefore, the first control valve 16 is provided in the flow path for supplying cleaning water to the discharge unit 54 and the like, which is a valve control unit described later, and controls the supply of cleaning water to the discharge unit 54 and the like, which is a valve control unit. Therefore, the first control valve 16 supplies cleaning water to the discharge unit 54 and the like, which is a valve control unit, via the drain valve hydraulic drive unit 14.

[0031] The first control valve 16 includes a main valve body 16a, a main valve port 16b opened and closed by the main valve body 16a, a pressure chamber 16c for moving the main valve body 16a, and a pilot valve 16d for switching the pressure in the pressure chamber 16c.

[0032] The main valve body 16a is configured to open and close the main valve port 16b of the first control valve 16. When the main valve port 16b is opened, the tap water supplied from the water supply pipe 38 flows into the drain valve hydraulic drive unit 14. The pressure chamber 16c is provided adjacent to the main valve body 16a inside the housing of the first control valve 16. A part of the tap water supplied from the water supply pipe 38 flows into the pressure chamber 16c, and the internal pressure is configured to rise. When the pressure in the pressure chamber 16c rises, the main valve body 16a is moved toward the main valve port 16b, and the main valve port 16b is closed.

[0033] The pilot valve 16d is configured to open and close a pilot valve port (not shown) provided in the pressure chamber 16c. When the pilot valve opens the pilot valve port (not shown), the water in the pressure chamber 16c flows out and the internal pressure decreases. When the pressure in the pressure chamber 16c decreases, the main valve body 16a separates from the main valve port 16b, and the first control valve 16 is opened. Also, when the pilot valve 16d is closed, the pressure in the pressure chamber 16c rises, and the first control valve 16 is closed.

[0034] The pilot valve 16d is moved by a solenoid valve 18 attached to the pilot valve 16d to open and close a pilot valve port (not shown). The solenoid valve 18 is electrically connected to the controller 40 and moves the pilot valve 16d based on a command signal from the controller 40. Specifically, the controller 40, which is a control unit, receives signals from the remote control device 6 and the human sensor 8, and the controller 40 sends an electrical signal to the solenoid valve 18 to operate it. In this way, the first control valve 16 is controlled by the controller 40.

[0035] Also, a vacuum breaker 36 is provided in the drive unit water supply passage 34a between the first control valve 16 and the drain valve hydraulic drive unit 14. When the pressure on the first control valve 16 side becomes negative due to this vacuum breaker 36, backflow of water to the first control valve 16 side is prevented.

[0036] Next, the second control valve 22 is configured to control the water supply to and stop of the water storage tank 10 based on the operation of the solenoid valve 24. The second control valve 22 is connected to the water supply pipe 38 via the first control valve 16. However, regardless of the opening and closing of the first control valve 16, the tap water supplied from the water supply pipe 38 always flows into the second control valve 22. The second control valve 22 is provided with a main valve body 22a, a pressure chamber 22b, and a pilot valve 22c, and the pilot valve 22c is opened and closed by the solenoid valve 24. When the pilot valve 22c is opened by the solenoid valve 24, the main valve body 22a of the second control valve 22 is opened, and the tap water flowing in from the water supply pipe 38 is supplied into the water storage tank 10 or the overflow pipe 10b. The solenoid valve 24 is also electrically connected to the controller 40 and moves the pilot valve 22c based on a command signal from the controller 40. Specifically, based on the operation of the remote control device 6, the controller 40 sends an electrical signal to the solenoid valve 24 to operate it. In this way, the second control valve 22 is controlled by the controller 40. Note that the solenoid valve 24 may be omitted. When the solenoid valve 24 is omitted, as will be described later, the pilot valve 22c is controlled by the float switch 42.

[0037] On one side, a float switch 42 is connected to the pilot valve 22c. The float switch 42 is configured to control the pilot valve 22c based on the water level in the water storage tank 10 and open and close a pilot valve port (not shown). That is, when the water level in the water storage tank 10 reaches a predetermined water level, the float switch 42 sends a signal to the pilot valve 22c to close the pilot valve port (not shown). That is, the float switch 42 is configured to set the water storage level in the water storage tank 10 to a predetermined full water level WL that is the water stop level. The float switch 42 is disposed in the water storage tank 10, and is configured to stop the water supply from the first control valve 16 to the drain valve hydraulic drive unit 14 when the water level in the water storage tank 10 rises to the full water level WL. Note that the float switch 42 can be changed to a ball tap mechanism. This ball tap mechanism includes a ball tap float that moves up and down according to the water level, and a support arm that is connected to the ball tap float and acts on the pilot valve 22c. Thereby, when the water level in the water storage tank 10 rises to the full water level WL, the ball tap float of the ball tap mechanism rises, the support arm connected to the ball tap float is rotated upward, and the pilot valve port of the pilot valve 22c is mechanically closed. When the water level in the water storage tank 10 drops below the full water level WL, the ball tap float of the ball tap mechanism drops, the support arm connected to the ball tap float is rotated downward, and the pilot valve port of the pilot valve 22c is mechanically opened.

[0038] Also, a water supply path branch portion 50a is provided in a water supply path 50 extending from the second control valve 22. One of the water supply paths 50 branched at the water supply path branch portion 50a is configured to let water flow out into the water storage tank 10, and the other is configured to let water flow out into the overflow pipe 10b. Therefore, a part of the washing water supplied from the second control valve 22 is discharged to the toilet body 2 through the overflow pipe 10b, and the rest is stored in the water storage tank 10.

[0039] Also, a vacuum breaker 44 is provided in the water supply line 50. When the second control valve 22 side becomes negative pressure due to this vacuum breaker 44, backflow of water into the second control valve 22 is prevented.

[0040] Also, the water supplied from the waterworks is supplied to the first control valve 16 and the second control valve 22 via a stop valve 38a arranged outside the water storage tank 10 and a constant flow valve 38b arranged in the water storage tank 10 on the downstream side of this stop valve 38a, respectively. The stop valve 38a is provided to stop the supply of water to the washing water tank device 4 during maintenance or the like, and is normally used in an open state. The constant flow valve 38b is provided to allow the water supplied from the waterworks to flow into the first control valve 16 and the second control valve 22 at a predetermined flow rate, and is configured to supply water at a constant flow rate regardless of the installation environment of the flush toilet device 1.

[0041] The controller 40 incorporates a CPU, a memory, etc., and controls devices connected so as to execute a large cleaning mode and a small cleaning mode described later based on a predetermined control program recorded in the memory, etc. The controller 40 is electrically connected to the remote control device 6, the human sensor 8, the solenoid valve 18, the solenoid valve 24, etc.

[0042] Next, with reference to FIG. 3 newly, the configuration and operation of the clutch mechanism 30 will be described. FIG. 3 schematically shows the configuration of the clutch mechanism 30 and shows the operation when it is pulled up by the drain valve hydraulic drive unit 14.

[0043] First, as shown in column (a) of FIG. 3, the clutch mechanism 30 is provided at the lower end of a rod 32 that extends downward from the drain valve hydraulic drive unit 14, and is configured to connect and disconnect the lower end of the rod 32 and the upper end of the valve shaft 12a of the drain valve 12. The clutch mechanism 30 includes a rotary shaft 30a attached to the lower end of the rod 32, a hook member 30b supported by the rotary shaft 30a, and an engagement claw 30c provided at the upper end of the valve shaft 12a of the drain valve 12. With such a structure, the clutch mechanism 30 is disengaged at a predetermined timing and a predetermined lifting height, and the drain valve 12 is lowered.

[0044] The rotary shaft 30a is horizontally attached to the lower end of the rod 32 and rotatably supports the hook member 30b. The hook member 30b is a plate-shaped member, and its middle portion is rotatably supported by the rotary shaft 30a. In addition, the lower end of the hook member 30b is bent into a hook shape to form a hook portion. The engagement claw 30c provided at the upper end of the valve shaft 12a of the drain valve 12 is a right-angled triangular claw. The bottom side of the engagement claw 30c is oriented substantially horizontally, and the side surface is formed to be inclined downward.

[0045] In the state shown in column (a) of FIG. 3, the drain valve 12 is seated on the drain port 10a, and the drain port 10a is closed. Also, in this state, the drain valve hydraulic drive unit 14 and the drain valve 12 are connected. In this connected state, the hook portion of the hook member 30b is engaged with the bottom side of the engagement claw 30c, and the drain valve 12 can be lifted by the rod 32.

[0046] Next, as shown in column (b) of FIG. 3, when cleaning water is supplied to the drain valve hydraulic drive unit 14, the piston 14b moves upward, and accordingly, the drain valve 12 is pulled up by the rod 32. Further, as shown in column (c) of FIG. 3, when the drain valve 12 is pulled up to a predetermined position, the upper end of the hook member 30b abuts against the bottom surface of the drain valve hydraulic drive unit 14, and the hook member 30b is rotated about the rotation shaft 30a. By this rotation, the hook portion at the lower end of the hook member 30b is moved in a direction away from the engaging claw 30c, and the engagement between the hook member 30b and the engaging claw 30c is released. When the engagement between the hook member 30b and the engaging claw 30c is released, as shown in column (d) of FIG. 3, the drain valve 12 descends through the cleaning water stored in the water storage tank 10 toward the drain port 10a. (As will be described later, the descended drain valve 12 is temporarily held at a predetermined height by the holding mechanism 46 before seating on the drain port 10a.)

[0047] Furthermore, as shown in column (e) of FIG. 3, when the cleaning water supplied to the drain valve hydraulic drive unit 14 is stopped, the rod 32 descends by the biasing force of the spring 14c. When the rod 32 descends, as shown in column (f) of FIG. 3, the tip of the hook portion of the hook member 30b attached to the lower end of the rod 32 abuts against the engaging claw 30c. When the rod 32 descends further, as shown in column (g) of FIG. 3, the hook portion of the hook member 30b is pushed by the inclined surface of the engaging claw 30c, and the hook member 30b is rotated. When the rod 32 descends further, as shown in column (h) of FIG. 3, the hook portion of the hook member 30b straddles the engaging claw 30c, and the hook member 30b is rotated back to its original position by gravity, and the hook portion of the hook member 30b and the engaging claw 30c engage again, returning to the state shown in column (a) of FIG. 3.

[0048] Returning again to FIGS. 2 and 4, the water reservoir portion and the like of the cleaning water tank device 4 will be described. FIG. 4 is an enlarged view showing the drain valve 12, the water reservoir portion 56, the float 26, and the holding mechanism 46 in FIG. 2. Column (a) of FIG. 4 shows the state in which the drain valve 12 is closed, and column (b) shows the state in which the drain valve 12 is opened and held by the holding mechanism 46. As shown in Fig. 2, the washing water tank device 4 further includes a discharge unit 54 that discharges the supplied washing water, a water storage unit 56 that stores the washing water discharged from the discharge unit 54, a float 26 provided in the water storage unit 56 that moves up and down according to the water level in the water storage unit 56, a transmission unit 48 connected to the float 26, and a holding mechanism 46 which is a timing control mechanism that moves between a holding state that restricts the lowering of the drain valve 12 in conjunction with the movement of the transmission unit 48 and a non-holding state that does not restrict the lowering of the drain valve 12 (a state in which the engagement with the holding claw 12b of the drain valve 12 is released).

[0049] The discharge unit 54, the water storage unit 56, the float 26, and the transmission unit 48 function as a valve control unit. The valve control unit is connected to the holding mechanism 46 and is provided to operate at a timing according to the amount of washing water selected by the remote control device 6 or the like. The washing water tank device 4 is provided with such a valve control unit. When the first amount of washing water is selected by the remote control device 6 or the like, the valve control unit engages the holding mechanism 46 with the drain valve 12 until the first time, and then operates the holding mechanism 46 so that the engagement between the holding mechanism 46 and the drain valve 12 is released, causing the drain valve 12 to descend due to the elapse of the first time. Also, when the second amount of washing water is selected by the remote control device 6 or the like, the valve control unit engages the holding mechanism 46 with the drain valve 12 until the second time, which is shorter than the first time, and then operates the holding mechanism 46 so that the engagement between the holding mechanism 46 and the drain valve 12 is released, causing the drain valve 12 to descend due to the elapse of the second time. Further, when an arbitrary amount of washing water is selected by the remote control device 6 or the like, the valve control unit engages the holding mechanism 46 with the drain valve 12 until a predetermined time corresponding to the arbitrary amount of washing water, and then operates the holding mechanism 46 so that the engagement between the holding mechanism 46 and the drain valve 12 is released, causing the drain valve 12 to descend due to the elapse of the predetermined time. Thereby, not limited to the first amount of washing water (the amount of washing water for the large washing mode) and the second amount of washing water (the amount of washing water for the small washing mode), the amount of washing water can be changed relatively easily according to the usage state of the user, and an arbitrary amount of washing water can be supplied to the toilet body 2. Thus, the valve control unit formed by the discharge unit 54, the water storage unit 56, the float 26, and the transmission unit 48 is formed to be operated by the supplied washing water.

[0050] When the second amount of washing water is selected by the remote control device 6, the discharging unit 54 discharges the supplied washing water. Also, the discharging unit 54 is provided to discharge the washing water even when the first amount of washing water is selected by the remote control device 6. The discharging unit 54 is formed at the lower end of the driving unit drain passage 34b and extends downward. The discharging unit 54 penetrates the upper surface of the casing 13 and is fixed to the upper surface of the casing 13. The discharging unit 54 forms a tapered and downward discharge port. Therefore, the washing water is accelerated downward by gravity, and since the flow path is narrowed at the discharge port, its flow velocity is further accelerated. The discharging unit 54 is disposed inside the side wall of the water reservoir portion 56 and above the full water level WL.

[0051] At least a part of the water reservoir portion 56 is located below the water stop level (full water level WL) of the water storage tank 10 in the standby state before the start of washing. More preferably, the water reservoir portion 56 is located below the water stop level (full water level WL) of the water storage tank 10 in the standby state before the start of washing. The water reservoir portion 56 is formed in a hollow box shape with an open upper surface. A part of the side wall of the water reservoir portion 56 is formed by the casing 13, and the water reservoir portion 56 is fixed to the casing 13. The water reservoir portion 56 is disposed below the discharging unit 54 and is formed to receive the washing water discharged from the discharging unit 54. Also, the water reservoir portion 56 is disposed so as to surround the outside of the float 26. The volume of the washing water that can be stored between the water reservoir portion 56 and the float 26 within the water reservoir portion 56 is smaller than the volume of the cylinder 14a. The water reservoir portion 56 is formed with a discharge hole 56b for discharging the stored washing water. The discharge hole 56b is formed at the lower part of the side wall 56c of the water reservoir portion 56 and forms an opening directed to the side opposite to the valve shaft 12a of the drain valve 12 in plan view. The discharge hole 56b forms a small hole with a relatively small diameter. Therefore, the instantaneous flow rate A1 (see FIG. 7) of the washing water discharged from the water reservoir portion 56 to the outside (inside the water storage tank 10) is smaller than the instantaneous flow rate A2 (see FIG. 7) of the washing water discharged from the discharging unit 54.

[0052] The float 26 is disposed within the water storage portion 56. The float 26 is a hollow rectangular parallelepiped-shaped member and is configured to receive buoyancy from the cleaning water stored within the water storage portion 56. Due to this buoyancy, when the water level within the water storage portion 56 is at or above a predetermined water level (generally the water level of the float 26), the float 26 assumes the state shown by the solid line in column (a) of FIG. 4. The float 26 is driven based on the water level within the water storage portion 56 and is indirectly related to the water level within the water storage tank 10 but is directly driven independently.

[0053] The transmission portion 48 forms a rod-shaped member that extends vertically downward from the lower surface of the float 26. The transmission portion 48 is fixed to the lower surface of the float 26. The transmission portion 48 penetrates the bottom surface of the water storage portion 56 and extends downward beyond the water storage portion 56. The transmission portion 48 is not fixed to the water storage portion 56 and is disposed slidably with respect to the water storage portion 56. The lower end of the transmission portion 48 is connected to the holding mechanism 46. Thus, the transmission portion 48 moves up and down in accordance with the up and down movement of the float 26 and operates the holding mechanism 46.

[0054] The holding mechanism 46 is connected to the transmission portion 48, operates in accordance with the up and down movement of the float 26 and the transmission portion 48, and controls the timing of lowering the drain valve 12 such that the timing at which the drain port 10a is closed when the second cleaning water volume is selected is earlier than when the first cleaning water volume is selected. For this purpose, the holding mechanism 46 stops the downward movement of the drain valve 12 while engaged with the drain valve 12 and controls the timing at which the drain port 10a is closed.

[0055] The holding mechanism 46 is moved between a holding state and a non-holding state in conjunction with the movement of the transmission part 48. When the holding mechanism 46 is moved to the holding state, it is configured to engage with the drain valve 12 and hold the drain valve 12 at a predetermined height. The holding mechanism 46 is a mechanism connected to the transmission part 48 and a link mechanism or the like, and has a support shaft 46a, an arm member 46b supported by the support shaft 46a, and an engaging member 46c that is an engaging part. The support shaft 46a is a rotating shaft fixed to the water storage tank 10 by an arbitrary member (not shown), and rotatably supports the arm member 46b and the engaging member 46c. On the other hand, at the base end of the valve shaft 12a of the drain valve 12, a holding claw 12b formed to be engageable with the engaging member 46c is formed. This holding claw 12b is a right-angled triangular projection, extends from the valve shaft 12a toward the engaging member 46c, its base is directed in the horizontal direction, and its side surface extends so as to be inclined downward.

[0056] The support shaft 46a is a shaft extending in a direction perpendicular to the plane of FIG. 4, and both ends thereof are fixed to the water storage tank 10 by an arbitrary member (not shown), and the intermediate part is curved so as to move away from the valve shaft 12a. Further, the arm member 46b is a bent beam-shaped member, and its lower end portion is configured to branch into two. The lower ends of these branched arm members 46b are rotatably supported at both ends of the support shaft 46a, respectively. For this reason, even when the drain valve 12 is moved in the vertical direction, the support shaft 46a and the arm member 46b do not interfere with the holding claw 12b provided on the valve shaft 12a of the drain valve 12.

[0057] On one hand, the upper end of the arm member 46b is rotatably connected to the transmission part 48. For this reason, when the float 26 is receiving buoyancy, the float 26 is held in the state shown by the solid line in column (a) of FIG. 4. Further, when the water level in the water storage part 56 drops, the float 26 and the transmission part 48 descend due to their own weights, and the arm member 46b and the engagement member 46c are rotated about the support shaft 46a to the state shown by the imaginary line in column (a) of FIG. 4. Note that the rotation of the arm member 46b and the engagement member 46c is restricted between the held state shown by the solid line in column (a) of FIG. 4 and the non-held state shown by the imaginary line.

[0058] Furthermore, the engagement member 46c is a member rotatably attached to the support shaft 46a, and its base end portion is rotatably supported at both end portions of the support shaft 46a. The engagement member 46c is formed so as to be able to engage with the drain valve 12 according to the position of the float 26. Also, the tip of the engagement member 46c extends so as to curve toward the valve shaft 12a of the drain valve 12. When cleaning water is stored in the water storage part 56 and the float 26 is rising, the holding mechanism 46 positions the engagement member 46c at a position where it can engage with the drain valve 12. For this reason, in the held state rotated to the position shown by the solid line in column (a) of FIG. 4, the tip of the engagement member 46c interferes with the holding claw 12b provided on the valve shaft 12a. On the other hand, when the float 26 descends, the holding mechanism 46 moves the engagement member 46c to a position where the engagement with the drain valve 12 is released, as shown by the imaginary line in column (a) of FIG. 4. In the non-held state rotated to the position shown by the imaginary line in column (a) of FIG. 4 in this way, interference does not occur between the tip of the engagement member 46c and the holding claw 12b.

[0059] Further, the engaging member 46c is configured to rotate in conjunction with the arm member 46b about the support shaft 46a. That is, when the float 26, the transmission portion 48, and the arm member 46b are moved from the state shown by the solid line in the (a) column of FIG. 4 to the state shown by the imaginary line, the engaging member 46c also rotates to the state shown by the imaginary line in conjunction with the arm member 46b. However, in the state shown by the solid line in the (a) column of FIG. 4, when the tip of the engaging member 46c is pushed upward by the holding claw 12b of the drain valve 12, only the engaging member 46c rotates freely and can rotate. That is, when the tip portion of the engaging member 46c is pushed upward by the holding claw 12b, only the engaging member 46c can rotate to the position shown by the imaginary line in FIG. 4 while the float 26, the transmission portion 48, and the arm member 46b hold the position shown by the solid line.

[0060] On the other hand, as shown by the solid line in the (b) column of FIG. 4, when the drain valve 12 is pulled upward and the holding claw 12b is positioned above the engaging member 46c, the holding claw 12b and the engaging member 46c engage with each other, and the descent of the drain valve 12 is blocked. That is, the engaging member 46c constituting the holding mechanism 46 engages with the drain valve 12 and holds the drain valve 12 at a predetermined height. Therefore, when the drain valve 12 is pulled upward by the rod 32 (FIG. 3) connected to the drain valve hydraulic drive unit 14 and then the clutch mechanism 30 is disengaged, the drain valve 12 descends. During this descent, the holding claw 12b of the drain valve 12 and the engaging member 46c of the holding mechanism 46 engage with each other, and the drain valve 12 is held at a predetermined height.

[0061] Next, when the water level in the water storage portion 56 drops, the position of the float 26 drops, and the float 26, the transmission portion 48, and the arm member 46b move to the position shown by the imaginary line in the (b) column of FIG. 4. In conjunction with this movement, the engaging member 46c also rotates to the position shown by the imaginary line in the (b) column of FIG. 4, so that the engagement between the holding claw 12b and the engaging member 46c is released. As a result, the drain valve 12 descends, seats on the drain port 10a, and the drain port 10a is closed.

[0062] Next, with reference to FIGS. 2, 5 to 10 newly, the operation of the washing water tank device 4 according to the first embodiment of the present invention and the flushing toilet device 1 including the same will be described. First, in the standby state of toilet flushing shown in FIG. 2, the water level in the water storage tank 10 is at a predetermined full water level WL. In this state, both the first control valve 16 and the second control valve 22 are closed. Further, the holding mechanism 46 is in the holding state shown by the solid line in the (a) column of FIG. 4. In such a standby state before the discharge part 54 discharges the washing water, the washing water is stored in the water reservoir part 56, the float 26 of the water reservoir part 56 is lifted by the buoyancy of the washing water, the transmission part 48 connected to the float 26 is lifted, and further, the holding mechanism 46 is in the holding state. Next, when the user presses the large washing button of the remote control device 6 (FIG. 1), the remote control device 6 transmits an instruction signal for executing the large washing mode to the controller 40 (FIG. 2). Also, when the small washing button is pressed, an instruction signal for executing the small washing mode is transmitted to the controller 40. Thus, in the present embodiment, the flushing toilet device 1 includes two washing modes, a large washing mode and a small washing mode, with different washing water amounts, and the remote control device 6 functions as a washing water amount selection means for selecting the washing water amount.

[0063] In addition, in the flushing toilet device 1 of the present embodiment, even when a predetermined time has elapsed without the washing button of the remote control device 6 being pressed after the user's leaving the seat is detected by the human sensor 8 (FIG. 1), an instruction signal for toilet flushing is transmitted to the controller 40. Further, when the time from when the user sits on the flushing toilet device 1 to when the user leaves the seat is less than the predetermined time, the controller 40 determines that the user has urinated and executes the small washing mode. On the other hand, when the time from sitting to leaving the seat is equal to or more than the predetermined time, the controller 40 executes the large washing mode. Therefore, in this case, since the large washing mode for washing with the first washing water amount and the small washing mode for washing with the second washing water amount less than the first washing water amount are selected by the controller 40, the controller 40 functions as a washing water amount selection means.

[0064] Next, with reference to FIGS. 2, 5 to 10, the operation of the large cleaning mode will be described. When receiving an instruction signal indicating that large cleaning should be performed, the controller 40 operates the solenoid valve 18 (FIG. 2) provided in the first control valve 16, causing the pilot valve 16d on the solenoid valve side to separate from the pilot valve port. As a result, the pressure in the pressure chamber 16c decreases, the main valve body 16a separates from the main valve port 16b, and the main valve port 16b is opened. When the first control valve 16 is opened, as shown in FIG. 5, the cleaning water flowing in from the water supply pipe 38 is supplied to the drain valve hydraulic drive unit 14 via the first control valve 16. Thereby, the piston 14b of the drain valve hydraulic drive unit 14 is pushed up, the drain valve 12 is pulled up via the rod 32, and the cleaning water in the water storage tank 10 is discharged from the drain port 10a to the toilet body 2. At this time, the pilot valve 16d remains open, and the cleaning water flowing in from the water supply pipe 38 continues to be supplied to the drain valve hydraulic drive unit 14 via the first control valve 16. The piston 14b rises to the second position, and the drive unit water supply passage 34a and the drive unit drain passage 34b communicate with each other through the inside of the cylinder 14a, so that the cleaning water is discharged from the discharge part 54 to the water reservoir part 56. Therefore, after the drain valve hydraulic drive unit 14 raises the drain valve 12, the supply of cleaning water from the first control valve 16 to the water reservoir part 56 is started. As will be described later, since the clutch mechanism 30 is disengaged by the raising of the drain valve 12, after the clutch mechanism 30 is disengaged, the supply of cleaning water from the first control valve 16 to the water reservoir part 56, which is a valve control part, etc. is started.

[0065] When the drain valve 12 is pulled up, the holding claw 12b provided on the valve shaft 12a of the drain valve 12 pushes up and rotates the engaging member 46c of the holding mechanism 46, and the holding claw 12b passes over the engaging member 46c ((a) column → (b) column in FIG. 4). Next, as shown in FIG. 6, when the drain valve 12 is further pulled up, the clutch mechanism 30 is disengaged. That is, when the drain valve 12 reaches a predetermined height, the upper end of the hook member 30b of the clutch mechanism 30 hits the bottom surface of the drain valve hydraulic drive unit 14, and the clutch mechanism 30 is disengaged ((b) column → (c) column in FIG. 3).

[0066] When the clutch mechanism 30 is disengaged, the drain valve 12 begins to descend toward the drain port 10a due to its own weight. Here, immediately after the drain valve 12 is opened, since the water level in the water reservoir portion 56 is high, the float 26 is in a floating position due to buoyancy, the transmission portion 48 is in a raised state, and the holding mechanism 46 is in the holding state shown by the solid line in the (b) column of FIG. 4. Therefore, the holding claw 12b of the descending drain valve 12 engages with the engaging member 46c of the holding mechanism 46, and the drain valve 12 is held at a predetermined height by the holding mechanism 46. By the drain valve 12 being held by the holding mechanism 46, the drain port 10a is maintained in the open state, and the discharge of the washing water in the water storage tank 10 to the toilet body 2 is maintained. Also, even after the clutch mechanism 30 is disengaged and the drain port 10a is in the open state, the pilot valve 16d of the pilot valve 16d is still in the open state, and the washing water is discharged from the discharge portion 54 to the water reservoir portion 56. Therefore, the descent of the float 26 in the water reservoir portion 56 is restricted, and the descent of the drain valve 12 is restricted.

[0067] Next, as shown in FIG. 7, when the water level in the water storage tank 10 drops, the float switch 42 that detects the water level in the water storage tank 10 turns off. When the float switch 42 turns off, the pilot valve 22c provided in the second control valve 22 opens. Therefore, washing water is supplied into the water storage tank 10 from the second control valve 22 via the water supply passage 50. When the pilot valve 22c opens, if the large washing mode is selected by the controller 40, the controller 40 keeps the pilot valve 16d on the solenoid valve 18 side open. The washing water flowing in from the water supply pipe 38 is still discharged from the discharge portion 54 to the water reservoir portion 56 via the first control valve 16 and the drain valve hydraulic drive portion 14.

[0068] The washing water discharged from the discharge section 54 is stored in the water storage section 56. At this time, a small amount of the washing water is discharged from the discharge hole 56b to the outside of the water storage section 56 (inside the water storage tank 10). On the other hand, the instantaneous flow rate A1 (see Fig. 7) of the washing water discharged from the discharge hole 56b is smaller than the instantaneous flow rate A2 (see Fig. 7) of the washing water discharged from the discharge section 54. Among the washing water discharged into the water storage section 56, the washing water exceeding the upper end of the water storage section 56 flows into the water storage tank 10. In this way, the amount of washing water in the water storage section 56 does not decrease and maintains almost the same water level as the standby water level before the start of washing. Therefore, since the water level in the water storage section 56 is high, the float 26 is in a floating position due to buoyancy, the transmission section 48 is in a raised state, and the holding mechanism 46 is in the holding state shown by the solid line in column (b) of Fig. 4. For this reason, the holding claw 12b of the descending drain valve 12 engages with the engaging member 46c of the holding mechanism 46, and the drain valve 12 is held at a predetermined height by the holding mechanism 46. Since the drain valve 12 is held by the holding mechanism 46, the drain port 10a is maintained in an open valve state, and the discharge of the washing water in the water storage tank 10 to the toilet body 2 is maintained.

[0069] Next, as shown in Fig. 8, when the large washing mode is selected, the controller 40 opens the solenoid valve 18 (start of washing), and after the elapse of the first hour, closes the solenoid valve 18 and closes the first control valve 16. The timing (elapse of the first hour) at which the controller 40 closes the solenoid valve 18 is set in consideration of the timing at which the water level in the water storage tank 10 drops to a predetermined water level WL1 and the drain valve 12 seats on the drain port 10a to block the drain port 10a, reducing the washing water in the water storage section 56 and lowering the float 26, as will be described later. Since the first control valve 16 is closed, the supply of the washing water to the drain valve water pressure drive section 14 and the discharge section 54 is stopped. Immediately after the supply of the washing water stops, the washing water is stored outside the float 26 in the water storage section 56 until it is almost full, and the float 26a is in the state shown in Fig. 7 (floating under the action of buoyancy). Thereafter, the washing water stored in the water storage section 56 is gradually discharged from the discharge hole 56b, and the water level of the washing water in the water storage section 56 drops.

[0070] Also, as shown in FIG. 8, when the water level of the washing water in the water storage portion 56 drops to a predetermined water level WL3 (at this time, it corresponds to the time when the water level in the water storage tank 10 drops to a predetermined water level WL1), the position of the float 26 connected to the transmission portion 48 and the holding mechanism 46 drops. As a result, the holding mechanism 46 shifts to a non-holding state shown by an imaginary line in column (b) of FIG. 4. Thereby, the engagement between the engaging member 46c and the holding claw 12b of the drain valve 12 is released. When the holding mechanism 46 shifts to the non-holding state, the drain valve 12 detaches from the holding mechanism 46 and starts to descend again. The supply of the washing water supplied into the water storage tank 10 from the second control valve 22 via the water supply passage 50 is still continued.

[0071] As shown in FIG. 9, the lowered drain valve 12 seats on the drain port 10a, and the drain port 10a is blocked. Thus, when the large washing mode is executed, the drain valve 12 is held until the water level in the water storage tank 10 drops from the full water level WL to the predetermined water level WL1, and the first washing water amount is discharged to the toilet body 2.

[0072] On the other hand, since the float switch 42 is still in the off state, the open state of the second control valve 22 is maintained, and the water supply to the water storage tank 10 is continued. The washing water supplied via the water supply passage 50 reaches the water supply passage branch portion 50a, and a part of the washing water branched at the water supply passage branch portion 50a flows into the overflow pipe 10b, and the rest is stored in the water storage tank 10. The washing water flowing into the overflow pipe 10b flows into the toilet body 2 and is used for refilling the bowl portion 2a. When the washing water flows into the water storage tank 10 with the drain valve 12 closed, the water level in the water storage tank 10 rises.

[0073] As shown in FIG. 10, when the water level in the water storage tank 10 rises to a predetermined full water level WL, the float switch 42 is turned on. When the float switch 42 is turned on, the pilot valve 22c on the float switch side is closed. As a result, since the pilot valve 22c is in a closed state, the pressure in the pressure chamber 22b rises, the main valve body 22a of the second control valve 22 is closed, and the water supply is stopped. Since the water level in the water storage tank 10 rises to the predetermined full water level WL, the washing water flows into the water storage portion 56, the float 26 and the transmission portion 48 rise, and the holding mechanism 46 returns to the holding state.

[0074] As shown in FIG. 8, after the first control valve 16 is closed and the water supply to the drain valve hydraulic drive unit 14 is stopped, as shown in FIGS. 9 and 10, the washing water in the cylinder 14a of the drain valve hydraulic drive unit 14 gradually flows out from the gap 14d, and the piston 14b is pushed down by the biasing force of the spring 14c. Along with this, the rod 32 descends. As a result, the clutch mechanism 30 is connected (columns (e) to (h) of FIG. 3), and the standby state before the toilet bowl washing is started is restored.

[0075] Next, with reference to FIGS. 2, 11 to 15, the operation of the small washing mode will be described. As shown in FIG. 2, the standby state of the toilet bowl washing is the same as that in the large washing mode. When receiving an instruction signal to perform small washing, the controller 40 operates the solenoid valve 18 provided in the first control valve 16 to open the first control valve 16. On the other hand, the controller 40 keeps the second control valve 22 closed. When the first control valve 16 is opened, as shown in FIG. 11, the washing water flowing in from the water supply pipe 38 is supplied to the drain valve hydraulic drive unit 14 through the first control valve 16. As a result, the piston 14b of the drain valve hydraulic drive unit 14 is pushed up, the drain valve 12 is pulled up through the rod 32, and the washing water in the water storage tank 10 is discharged from the drain port 10a to the toilet bowl main body 2. When the drain valve 12 is pulled up, the holding claw 12b (column (a) of FIG. 4) provided on the valve shaft 12a of the drain valve 12 pushes up and rotates the engaging member 46c of the holding mechanism 46, and the holding claw 12b passes over the engaging member 46c.

[0076] Next, as shown in FIG. 12, when the drain valve 12 is further lifted, the clutch mechanism 30 is disengaged. That is, when the drain valve 12 reaches a predetermined height, the upper end of the hook member 30b of the clutch mechanism 30 contacts the bottom surface of the drain valve hydraulic drive unit 14, and the clutch mechanism 30 is disengaged (from the (b) column to the (c) column in FIG. 3).

[0077] When the clutch mechanism 30 is disengaged, the drain valve 12 begins to descend toward the drain port 10a due to its own weight. Here, immediately after the drain valve 12 is opened, since the water level in the water storage portion 56 is high, the float 26 is in a floating position due to buoyancy, the transmission portion 48 is in a raised state, and the holding mechanism 46 is in the holding state shown by the solid line in the (b) column of FIG. 4. Therefore, the holding claw 12b of the descending drain valve 12 engages with the engaging member 46c of the holding mechanism 46, and the drain valve 12 is held at a predetermined height by the holding mechanism 46. By the drain valve 12 being held by the holding mechanism 46, the drain port 10a is maintained in an open state, and the discharge of the washing water in the water storage tank 10 to the toilet body 2 is maintained. Also, even after the clutch mechanism 30 is disengaged and the drain port 10a is in an open state, the pilot valve 16d remains open, and the washing water is discharged from the discharge portion 54 to the water storage portion 56. Therefore, the descent of the float 26 in the water storage portion 56 is restricted, and the descent of the drain valve 12 is restricted.

[0078] The discharge from the discharge section 54 continues for a predetermined time. The cleaning water discharged from the discharge section 54 is stored in the water reservoir section 56. At this time, a small amount of the cleaning water is discharged from the discharge hole 56b to the outside of the water reservoir section 56 (inside the water storage tank 10). On the other hand, the instantaneous flow rate A1 (see Fig. 7) of the cleaning water discharged from the discharge hole 56b is smaller than the instantaneous flow rate A2 (see Fig. 7) of the cleaning water discharged from the discharge section 54. Among the cleaning water discharged into the water reservoir section 56, the cleaning water exceeding the upper end of the water reservoir section 56 flows into the water storage tank 10. In this way, the amount of cleaning water in the water reservoir section 56 does not decrease, and the water level is maintained at approximately the same level as the standby water level before the start of cleaning. Therefore, since the water level in the water reservoir section 56 is high, the float 26 is in a floating position due to buoyancy, the transmission section 48 is in a raised state, and the holding mechanism 46 is in the holding state shown by the solid line in column (b) of Fig. 4. For this reason, the holding claw 12b of the descending drain valve 12 engages with the engaging member 46c of the holding mechanism 46, and the drain valve 12 is held at a predetermined height by the holding mechanism 46. By the drain valve 12 being held by the holding mechanism 46, the drain port 10a is maintained in the open valve state, and the discharge of the cleaning water in the water storage tank 10 to the toilet body 2 is maintained.

[0079] Next, as shown in FIG. 13, when the small cleaning mode is selected, the controller 40 opens the solenoid valve 18 (start cleaning), and after the elapse of the second hour, closes the solenoid valve 18 and closes the first control valve 16. The second hour is shorter than the first hour. The timing at which the controller 40 closes the solenoid valve 18 (when the second hour has elapsed) is set in consideration of the timing when the water level in the water storage tank 10 drops to a predetermined water level WL2, the drain valve 12 seats on the drain port 10a, and the drain port 10a is blocked, so that the cleaning water in the water reservoir 56 drops and the float 26 drops. Since the first control valve 16 is closed, the supply of cleaning water to the drain valve water pressure drive unit 14 and the discharge unit 54 is stopped. Immediately after the supply of cleaning water stops, the cleaning water is stored almost to the full level of the water reservoir 56 outside the float 26 in the water reservoir 56, and the float 26 is in the state shown in FIG. 12 (floating under buoyancy). Thereafter, the cleaning water stored in the water reservoir 56 is gradually discharged from the discharge hole 56b, and the water level of the cleaning water in the water reservoir 56 drops.

[0080] Also, as shown in FIG. 13, when the water level of the cleaning water in the water reservoir 56 drops to a predetermined water level WL4 (a water level almost the same height as the predetermined water level WL3) (this corresponds to the time when the water level in the water storage tank 10 drops to the predetermined water level WL2), the position of the float 26 connected to the transmission unit 48 and the holding mechanism 46 drops. As a result, the holding mechanism 46 shifts to the non-holding state shown by the imaginary line in column (b) of FIG. 4. Thereby, the engagement between the engaging member 46c and the holding claw 12b of the drain valve 12 is released. When the holding mechanism 46 shifts to the non-holding state, the drain valve 12 detaches from the holding mechanism 46 and starts to descend again. The supply of cleaning water supplied into the water storage tank 10 from the second control valve 22 via the water supply path 50 continues.

[0081] As shown in FIG. 14, the lowered drain valve 12 seats on the drain port 10a, and the drain port 10a is closed. Thus, when the small cleaning mode is executed, the drain valve 12 is held until the water level in the water storage tank 10 drops from the full water level WL to a predetermined water level WL2, and the second cleaning water volume is discharged to the toilet body 2.

[0082] On the other hand, since the float switch 42 is still in the off state, the open state of the second control valve 22 is maintained, and the water supply to the water storage tank 10 continues. The cleaning water supplied through the water supply passage 50 reaches the water supply passage branch portion 50a. A part of the cleaning water branched at the water supply passage branch portion 50a flows into the overflow pipe 10b, and the rest is stored in the water storage tank 10. The cleaning water flowing into the overflow pipe 10b flows into the toilet body 2 and is used for refilling the bowl portion 2a. With the drain valve 12 closed, the cleaning water flows into the water storage tank 10, causing the water level in the water storage tank 10 to rise.

[0083] As shown in FIG. 15, when the water level in the water storage tank 10 rises to the predetermined full water level WL, the float switch 42 turns on. When the float switch 42 is turned on, the pilot valve 22c on the float switch side closes. As a result, since the pilot valve 22c is in the closed state, the pressure in the pressure chamber 22b rises, the main valve body 22a of the second control valve 22 closes, and the water supply stops. Since the water level in the water storage tank 10 rises to the predetermined full water level WL, the cleaning water flows into the water reservoir portion 56, the float 26 and the transmission portion 48 rise, and the holding mechanism 46 returns to the holding state.

[0084] As shown in FIG. 13, after the first control valve 16 is closed and the water supply to the drain valve hydraulic drive unit 14 stops, as shown in FIGS. 14 and 15, the cleaning water in the cylinder 14a of the drain valve hydraulic drive unit 14 gradually flows out from the gap 14d, and the piston 14b is pushed down by the biasing force of the spring 14c. Along with this, the rod 32 drops. As a result, the clutch mechanism 30 is connected (columns (e) to (h) of FIG. 3), and the standby state before the toilet cleaning starts is restored.

[0085] According to the washing water tank device 4 according to the first embodiment of the present invention described above, since the drain valve 12 and the drain valve hydraulic pressure drive unit 14 are connected by the clutch mechanism 30 and are disconnected at a predetermined timing, it is possible to move the drain valve 12 regardless of the operating speed of the drain valve hydraulic pressure drive unit 14, and the drain valve 12 can be closed. As a result, even if there is a variation in the operating speed of the drain valve hydraulic pressure drive unit when the drain valve is lowered, it is possible to control the timing of closing the drain valve without being affected by the variation. Further, when the first washing water volume is selected by the remote control device 6, the valve control unit engages the holding mechanism 46 with the drain valve 12 and operates so that the engagement between the holding mechanism 46 and the drain valve 12 is released after the elapse of the first time. When the second washing water volume is selected by the remote control device 6, the valve control unit engages the holding mechanism 46 with the drain valve 12 and operates so that the engagement between the holding mechanism 46 and the drain valve 12 is released after the elapse of the second time, which is shorter than the first time. Thus, when the second washing water volume is selected by the remote control device 6, the valve control unit can operate the holding mechanism 46 so that the timing at which the drain port 10a is closed is earlier than when the first washing water volume is selected. Therefore, according to one embodiment of the present invention, the first and second washing water volumes can be set while using the clutch mechanism 30.

[0086] Furthermore, according to the washing water tank device 4 according to the first embodiment of the present invention, the controller 40 is provided to control the first control valve 16, and the valve control unit is operated by the washing water supplied from the first control valve 16. As a result, with a relatively compact and simple configuration, while using the clutch mechanism 30, the drain valve 12 can be lowered after a predetermined time has elapsed, and the first and second washing water volumes can be set.

[0087] Furthermore, according to the washing water tank device 4 according to the first embodiment of the present invention, after the drain valve hydraulic pressure driving unit 14 raises the drain valve 12, the supply of washing water from the first control valve 16 to the valve control unit is started. Thereby, without inhibiting the operation of the drain valve hydraulic pressure driving unit 14 from raising the drain valve 12 with the washing water, with a relatively compact and simple configuration, while using the clutch mechanism 30, the drain valve 12 is lowered after a lapse of a predetermined time, and the first and second washing water amounts can be set.

[0088] Furthermore, according to the washing water tank device 4 according to the first embodiment of the present invention, since the first control valve 16 is provided so as to also control the supply of washing water to the drain valve hydraulic pressure driving unit 14, with a relatively compact and simple configuration, while using the clutch mechanism 30, the drain valve 12 is lowered after a lapse of a predetermined time, and the first and second washing water amounts can be set.

[0089] Furthermore, according to the washing water tank device 4 according to the first embodiment of the present invention, the first control valve 16 supplies washing water to the valve control unit via the drain valve hydraulic pressure driving unit 14. Thereby, with a relatively compact and simple configuration, it is possible to suppress the generation of relatively wasteful washing water that cannot contribute to the operation of either the drain valve hydraulic pressure driving unit 14 or the valve control unit in the washing water supplied from the first control valve 16, and the washing water can be effectively used in the drain valve hydraulic pressure driving unit 14 and the valve control unit.

[0090] Furthermore, according to the washing water tank device 4 according to the first embodiment of the present invention, when washing water is stored in the water storage portion 56 and the float 26 is raised, the holding mechanism 46 arranges the engaging member 46c at a position where it can engage with the drain valve 12, and when the float 26 descends, the holding mechanism 46 moves the engaging member 46c to a position where the engagement with the drain valve 12 is released. By using the water storage portion 56 and the float 26 provided in the water storage portion 56 in this way, it is possible to suppress the influence of variations in the flow rate of the washing water supplied to the water storage portion 56 and to realize the operation of the relatively stable holding mechanism 46 with a relatively simple configuration. Therefore, according to one embodiment of the present invention, while using the clutch mechanism 30, the first and second washing water amounts can be set relatively stably.

[0091] Furthermore, according to the washing water tank device 4 according to the first embodiment of the present invention, after the clutch mechanism 30 is disengaged, the supply of washing water from the first control valve 16 to the valve control unit is started. Thereby, without inhibiting the operation of raising the drain valve 12 by the washing water in the drain valve hydraulic pressure driving unit 14, with a relatively compact and simple configuration, while using the clutch mechanism 30, the drain valve 12 is lowered after a lapse of a predetermined time, and the first and second washing water amounts can be set.

[0092] Furthermore, a flushing toilet device having a plurality of washing modes with different washing water amounts according to the first embodiment of the present invention is characterized by including a flushing toilet and the washing water tank device of the present invention that supplies washing water to the flushing toilet.

[0093] Next, with reference to FIGS. 16 to 22, the washing water tank device 104 according to the second embodiment of the present invention will be described. Regarding this embodiment, the same parts as those of the washing water tank device 4 according to the first embodiment of the present invention described above are denoted by the same reference numerals, and the description thereof will be omitted.

[0094] Next, with reference to the accompanying drawings, a flushing toilet device according to the second embodiment of the present invention will be described. FIG. 16 is a cross-sectional view showing a schematic configuration of a washing water tank device according to the second embodiment of the present invention.

[0095] The washing water tank device 104 according to the second embodiment of the present invention as shown in FIG. 16 is provided in a flushing toilet device 1 (see FIG. 1) in the same manner as in the first embodiment of the present invention.

[0096] The washing water tank device 104 has a clutch mechanism 130 that lowers the drain valve 12 when disengaged. This clutch mechanism 130 connects the drain valve 12 and the drain valve hydraulic pressure driving unit 14 and pulls up the drain valve 12 by the driving force of the drain valve hydraulic pressure driving unit 14. The casing 13 is connected to and fixed to the drain valve hydraulic pressure driving unit 14.

[0097] The drain valve 12 is pulled up by the driving force of the drain valve hydraulic driving unit 14, the clutch mechanism 130 is disengaged at a predetermined height or at a predetermined timing, and it descends due to its own weight. By controlling the predetermined time until the clutch mechanism 130 is disengaged, the drain valve 12 is lowered, and the time until the drain valve 12 seats on the drain port 10a is adjusted.

[0098] Next, with reference to FIG. 17, the configuration and operation of the clutch mechanism 130 will be described. FIG. 17 schematically shows the configuration of the clutch mechanism 130 and shows the operation when it is pulled up by the drain valve hydraulic driving unit 14. Since the configuration and operation of the clutch mechanism 130 in the second embodiment are similar to those of the clutch mechanism 30 in the first embodiment, the description of the same parts will be omitted below, and mainly the different parts will be described.

[0099] First, as shown in FIG. 16, the clutch mechanism 130 is provided at the lower end of a rod 32 extending downward from the drain valve hydraulic driving unit 14, and is configured to connect and disconnect the lower end of the rod 32 and the upper end of the valve shaft 12a of the drain valve 12. The clutch mechanism 130 includes a rotating shaft 130a attached to the lower end of the rod 32, a hook member 130b supported by this rotating shaft 130a, an engaging claw 30c provided at the upper end of the valve shaft 12a, and a stop plate 130f that defines the upper limit of the pulling-up height of the clutch mechanism 130. With such a structure, the clutch mechanism 130 is disengaged at a predetermined timing and at a predetermined pulling-up height, and the drain valve 12 is lowered.

[0100] The rotating shaft 130a is horizontally attached to the lower end of the rod 32 and rotatably supports the hook member 130b. The hook member 130b is a plate-shaped member, and its middle part is rotatably supported by the rotating shaft 130a. Also, the lower end of the hook member 130b is bent into a hook shape to form a hook portion 130d. The hook member 130b is formed to extend vertically in a U-shape from the rotating shaft 130a. Among the hook member 130b, the upper portion extending above the rotating shaft 130a forms the upper end portion of the hook member 130b, and the upper end portion 130e of the hook member 130b is formed to have a length and position such that it does not contact the bottom surface of the drain valve hydraulic drive unit 14 even when the piston 14b is in the most raised state. Among the hook member 130b, the lower portion extending below the rotating shaft 130a forms the hook portion 130d of the hook member 130b that extends obliquely downward as the lower portion of the U-shape and then returns toward the valve shaft 12a. The engaging claw 30c provided at the upper end of the valve shaft 12a of the drain valve 12 is a plate-shaped claw. The bottom edge of the engaging claw 30c is formed to be substantially horizontal. The stopper plate 130f is formed to contact the bottom surface of the drain valve hydraulic drive unit 14 before the upper end portion 130e of the hook member 130b in the connected state contacts the bottom surface of the drain valve hydraulic drive unit 14 and stop the pulling up.

[0101] In the state shown in FIG. 16, the drain valve 12 is seated on the drain port 10a, and the drain port 10a is closed. Also, in this state, the drain valve hydraulic drive unit 14 and the drain valve 12 are connected, and in this connected state, the hook portion 130d of the hook member 130b is engaged with the bottom edge of the engaging claw 30c, and it is possible to pull up the drain valve 12 by the rod 32.

[0102] Returning to FIG. 16 again, the water reservoir portion and the like of the washing water tank device 4 will be described. The washing water tank device 104 further includes a discharge portion 54 that discharges the supplied washing water, a water reservoir portion 156 that stores the washing water discharged from the discharge portion 54, a transmission portion 148 that is connected to the water reservoir portion 156, and an acting portion 158 that is connected to the transmission portion 148 and moves horizontally.

[0103] The drain valve hydraulic drive unit 14, the discharge unit 54, the water storage unit 156, the transmission unit 148, and the acting unit 158 function as a valve control unit in whole or in part. The valve control unit is formed so as to be able to disconnect the clutch mechanism 130 at a predetermined timing. The washing water tank device 104 is provided with such a valve control unit. When the first washing water volume is selected by the remote control device 6 or the like, the valve control unit is operated to disconnect the clutch mechanism 130 after the elapse of the first time, and lower the drain valve 12 after the elapse of the first time. Further, when the second washing water volume is selected by the remote control device 6 or the like, the valve control unit is operated to disconnect the clutch mechanism 130 after the elapse of the second time, which is shorter than the first time, and lower the drain valve 12 after the elapse of the second time. Thus, the valve control unit is formed to be operated by the supplied washing water.

[0104] The discharge unit 54 discharges the supplied washing water when the second washing water volume is selected by the remote control device 6. Also, the discharge unit 54 is provided so as to discharge the washing water even when the first washing water volume is selected by the remote control device 6. The discharge unit 54 is formed at the lower end of the drive unit drain passage 34b and extends downward. The discharge unit 54 is provided above the upper surface of the casing 13. The discharge unit 54 is disposed outside the casing 13 and above the full water level WL. The discharge unit 54 forms a tapered and downward discharge port. Therefore, the washing water is accelerated downward by gravity, and further accelerated in its flow velocity because the flow path is narrowed at the discharge port. The discharge unit 54 is disposed inside the side wall of the water storage unit 156 and above the full water level WL.

[0105] At least a part of the water storage part 156 is located above the water stop level (full water level WL) of the water storage tank 10 in the standby state before the start of cleaning. More preferably, the water storage part 156 is located above the water stop level (full water level WL) of the water storage tank 10 in the standby state before the start of cleaning. The water storage part 156 is formed in a hollow box shape with an open upper surface. The water storage part 156 is disposed above the casing 13. The water storage part 156 is disposed below the discharge part 54 and is formed to receive the cleaning water discharged from the discharge part 54. The volume of the cleaning water that can be stored in the water storage part 156 is smaller than the volume of the cylinder 14a. The water storage part 156 is formed with a discharge hole 56b for discharging the stored cleaning water. The discharge hole 56b is formed in the lower part of the side wall 56c of the water storage part 156 and forms an opening directed to the side opposite to the valve shaft 12a of the drain valve 12 in plan view. The discharge hole 56b forms a small hole with a relatively small diameter. Therefore, the instantaneous flow rate A1 (see FIG. 7) of the cleaning water discharged from the water storage part 156 to the outside (inside the water storage tank 10) is smaller than the instantaneous flow rate A2 (see FIG. 7) of the cleaning water discharged from the discharge part 54.

[0106] The transmission part 148 forms a rod-shaped member that extends vertically downward from the lower surface of the water storage part 156. The transmission part 148 is fixed to the lower surface of the water storage part 156. The transmission part 148 penetrates the top surface of the casing 13 and extends to the inside of the casing 13. The transmission part 148 is not fixed to the casing 13 and is arranged slidably with respect to the casing 13. A spring 149 is arranged outside the transmission part 148, and the spring 149 is fixed to the water storage part 156 and the casing 13. Therefore, after the water storage part 156 and the transmission part 148 descend, when the weight of the water storage part 156 becomes lighter, the water storage part 156 and the transmission part 148 are lifted again by the spring 149 and return to the standby position. The transmission part 148 is connected to the acting part 158 via a rotatable transmission part side rotation shaft 160. The transmission part side rotation shaft 160 rotatably supports the acting part 158 and the transmission part 148. The transmission part side rotation shaft 160 is an axis extending in a direction perpendicular to the plane of FIG. 16. The acting part 158 further has a tip side rotation shaft 162 that enables the tip side to rotate. The tip side rotation shaft 162 rotatably supports the tip side portion and the transmission part side portion of the acting part 158. The tip side rotation shaft 162 is also an axis extending in a direction perpendicular to the plane of FIG. 16. The tip side rotation shaft 162 is located on the virtual line B1 and is attached to the casing 13 so as to move along the virtual line B1. The virtual line B1 substantially coincides with the height of the rotation shaft 130a in the state where the drain valve 12 is pulled up the most. Therefore, the transmission part 148 can move up and down similarly in response to the up and down movement of the float 26, and can cause the acting part 158 to perform operations of being pushed out or retracted laterally.

[0107] The acting part 158 is formed so as to be movable in the left - right direction at a predetermined height below the bottom surface of the drain valve hydraulic drive part 14. When the transmission part 148 descends, the acting part 158 moves horizontally so as to advance toward the valve shaft 12a. The tip part 158a of the acting part 158 is positioned in the space between the hook members 130b that open in a V - shape in the state where it has advanced and the hook member 130b is pulled up the most (see Fig. 18). Also, when the transmission part 148 ascends, the acting part 158 moves horizontally so as to retreat in a direction away from the valve shaft 12a. The tip part 158a of the acting part 158 forms a relatively large protruding part with a semi - circular cross - section. The acting part 158 controls the timing of lowering the drain valve 12 so that when the second amount of washing water is selected, the timing at which the drain port 10a is blocked is earlier than when the first amount of washing water is selected, in conjunction with the operations of the transmission part 148 and the water storage part 156, etc.

[0108] In a state where the water storage part 156 and the transmission part 148 have descended, the acting part 158 extends from the upper end part 130e of the hook member 130b to the side of the valve shaft 12a. If the acting part 158 only moves to the space between the hook members 130b that simply open in a V - shape, the hook member 130b is not actuated. When the supply of washing water to the drain valve hydraulic drive part 14 is stopped and the piston 14b moves downward, the upper end part 130e of the hook member 130b contacts the acting part 158, and the hook member 130b rotates and the clutch mechanism 130 is disengaged.

[0109] Next, with reference to Figs. 16 to 22 newly, the operation of the washing water tank device 104 according to the second embodiment of the present invention and the flush toilet device 1 equipped with the same will be described. First, in the standby state of the toilet cleaning shown in FIG. 16, the water level in the water storage tank 10 is at a predetermined full water level WL. In this state, both the first control valve 16 and the second control valve 22 are closed. The water reservoir portion 156 stores no cleaning water, and the water reservoir portion 156 and the transmission portion 148 are biased upward by a spring 149. The acting portion 158 is pulled by the transmission portion 148 and is located at a position retracted with respect to the valve shaft 12a. Next, when the user presses the large cleaning button of the remote control device 6 (FIG. 1), the remote control device 6 transmits an instruction signal for executing the large cleaning mode to the controller 40 (FIG. 16). Also, when the small cleaning button is pressed, an instruction signal for executing the small cleaning mode is transmitted to the controller 40.

[0110] Next, with reference to FIGS. 16 to 22, the operation of the large cleaning mode will be described. When the controller 40 receives an instruction signal indicating that a major cleaning should be performed, it actuates the solenoid valve 18 (Fig. 16) provided in the first control valve 16 to disengage the pilot valve 16d on the solenoid valve side from the pilot valve port. As a result, the pressure in the pressure chamber 16c decreases, the main valve body 16a disengages from the main valve port 16b, and the main valve port 16b opens. When the first control valve 16 opens, as shown in Fig. 17, the cleaning water flowing in from the water supply pipe 38 is supplied to the drain valve hydraulic drive unit 14 via the first control valve 16. Thereby, the piston 14b of the drain valve hydraulic drive unit 14 is pushed up, the drain valve 12 is pulled up via the rod 32, and the cleaning water in the water storage tank 10 is discharged from the drain port 10a to the toilet bowl main body 2. At this time, the pilot valve 16d remains open, and the cleaning water flowing in from the water supply pipe 38 continues to be supplied to the drain valve hydraulic drive unit 14 via the first control valve 16. The piston 14b rises to the second position (the most pushed-up state), and the drive unit water supply passage 34a and the drive unit drain passage 34b communicate with each other through the inside of the cylinder 14a, so that the cleaning water is discharged from the discharge part 54 to the water reservoir part 156. Therefore, after the drain valve hydraulic drive unit 14 raises the drain valve 12, the supply of the cleaning water from the first control valve 16 to the water reservoir part 156 is started. Even when the drain valve 12 rises and the stop plate 130f abuts against the bottom surface of the drain valve hydraulic drive unit 14, the upper end 130e of the hook member 130b of the clutch mechanism 130 does not abut against the bottom surface of the drain valve hydraulic drive unit 14. Therefore, the clutch mechanism 130 remains connected. Therefore, the drain valve 12 is held in the pulled-up state. On the other hand, the supply of the cleaning water to the water reservoir part 156 is started, and as the water reservoir part 156 and the transmission part 148 gradually descend, the action part 158 starts to move toward the valve shaft 12a. Note that the controller 40 keeps the second control valve 22 closed.

[0111] As shown in FIG. 18, the washing water continues to be supplied to the drain valve hydraulic drive unit 14 via the first control valve 16. The piston 14b of the drain valve hydraulic drive unit 14 is in the most pushed-up state, and the rod 32 and the clutch mechanism 130 are also in the most pulled-up state. Since the piston 14b is in the second position (the most pushed-up state), the washing water is supplied from the drain valve hydraulic drive unit 14 to the discharge unit 54. The instantaneous flow rate A1 of the washing water discharged from the discharge hole 56b of the water reservoir unit 156 is smaller than the instantaneous flow rate A2 of the washing water discharged from the discharge unit 54. Therefore, the water level of the washing water in the water reservoir unit 156 gradually rises. When the water level of the washing water in the water reservoir unit 156 almost reaches the full water level in the water reservoir unit 156, the water reservoir unit 156 and the transmission unit 148 are lowered by the weight of the washing water. Due to the lowering of the transmission unit 148, the action unit 158 is moved so as to protrude further laterally. The tip 158a of the action unit 158 is located in the space between the hook members 130b that are stationary in the most pulled-up state. The upper end 130e of the hook member 130b is located above the tip 158a and is separated from the tip 158a. Therefore, the clutch mechanism 130 still does not reach disengagement and continues to be in the holding state.

[0112] Next, as shown in FIG. 19, when the water level in the water storage tank 10 drops, the float switch 42 that detects the water level in the water storage tank 10 turns off. When the float switch 42 turns off, the pilot valve 22c provided in the second control valve 22 opens. Therefore, the washing water is supplied from the second control valve 22 into the water storage tank 10 via the water supply passage 50. When the pilot valve 22c opens, when the large washing mode is selected by the controller 40, the controller 40 keeps the pilot valve 16d on the solenoid valve 18 side open. The washing water flowing in from the water supply pipe 38 is still discharged from the discharge unit 54 to the water reservoir unit 156 via the first control valve 16 and the drain valve hydraulic drive unit 14. Therefore, the amount of washing water in the water reservoir unit 156 does not decrease, and the almost full water level of the water reservoir unit 156 is maintained. Therefore, the water reservoir unit 156 and the transmission unit 148 are in the lowered state, and the tip 158a of the action unit 158 is located in the space between the hook members 130b.

[0113] Next, as shown in FIG. 20, when the large cleaning mode is selected, the controller 40 opens the solenoid valve 18 (start of cleaning), and after one hour has elapsed, closes the solenoid valve 18 and closes the first control valve 16. The timing at which the controller 40 closes the solenoid valve 18 (when one hour has elapsed) is set in consideration of the timing when the piston 14b starts to descend and the clutch mechanism 130 is disengaged when the water level in the water storage tank 10 drops to a predetermined water level WL1 and the drain valve 12 seats on the drain port 10a, closing the drain port 10a, as will be described later. Since the first control valve 16 is closed, the supply of cleaning water to the drain valve water pressure drive unit 14 and the discharge unit 54 of the cleaning water is stopped. Immediately after the supply of the cleaning water stops, the cleaning water is stored in the water reservoir 156 until it is almost full, and the water reservoir 156 is in a state of being lowered by the weight of the cleaning water. Therefore, the tip 158a of the acting portion 158 is located and stopped in the space between the hook members 130b.

[0114] Also, since the supply of cleaning water to the drain valve water pressure drive unit 14 of the cleaning water is stopped, the cleaning water in the cylinder 14a gradually flows out from the gap 14d, and the piston 14b is pushed down by the biasing force of the spring 14c, and at the same time the rod 32 drops. As a result, the upper end 130e of the hook member 130b abuts against the tip 158a and is rotated counterclockwise about the rotation axis 130a. Along with this rotation, the lower part of the hook member 130b and the hook 130d are rotated so as to be lifted. Therefore, the engagement between the hook 130d and the engagement claw 30c is released. As a result, the clutch mechanism 130 is disengaged and the drain valve 12 descends. The supply of cleaning water supplied from the second control valve 22 into the water storage tank 10 via the water supply path 50 continues as before.

[0115] As shown in Fig. 21, the lowered drain valve 12 seats on the drain port 10a, closing the drain port 10a. Thus, when the large cleaning mode is executed, the drain valve 12 is held until the water level in the water storage tank 10 drops from the full water level WL to a predetermined water level WL1, and the first cleaning water volume is discharged to the toilet body 2. Thereafter, the cleaning water stored in the water reservoir 156 is gradually discharged from the discharge hole 56b, and the water level of the cleaning water in the water reservoir 156 drops. When the cleaning water in the water reservoir 156 runs out or decreases, the water reservoir 156 and the transmission part 148 are raised again by the spring 149 and return to the standby position. Therefore, the operating part 158 also retreats in a direction away from the valve shaft 12a in response to the rise of the transmission part 48. As the cleaning water in the cylinder 14a of the drain valve water pressure driving part 14 flows out, the piston 14b is further lowered.

[0116] Since the float switch 42 is still in the off state, the open state of the second control valve 22 is maintained, and the water supply to the water storage tank 10 continues. The cleaning water supplied through the water supply passage 50 reaches the water supply passage branch part 50a. A part of the cleaning water branched at the water supply passage branch part 50a flows into the overflow pipe 10b, and the rest is stored in the water storage tank 10. The cleaning water flowing into the overflow pipe 10b flows into the toilet body 2 and is used for refilling the bowl part 2a. With the drain valve 12 closed, the cleaning water flows into the water storage tank 10, causing the water level in the water storage tank 10 to rise.

[0117] As shown in Fig. 22, when the water level in the water storage tank 10 rises to the predetermined full water level WL, the float switch 42 turns on. When the float switch 42 is turned on, the pilot valve 22c on the float switch side closes. As a result, since the pilot valve 22c is in the closed state, the pressure in the pressure chamber 22b rises, the main valve body 22a of the second control valve 22 closes, and the water supply stops.

[0118] Furthermore, as the cleaning water in the cylinder 14a of the drain valve hydraulic drive unit 14 gradually flows out from the gap 14d, the piston 14b is pushed down by the biasing force of the spring 14c, and together with this, the rod 32 descends. When the hook portion 130d descends to the position of the engaging claw 30c, it descends along the inclined surface of the engaging claw 30c, overrides the engaging claw 30c, and is rotated back to its original position by gravity, and the hook portion 130d engages with the engaging claw 30c again, the clutch mechanism 130 is connected, and the rod 32 and the valve shaft 12a are in a connected state. Therefore, it returns to the standby state before the toilet bowl cleaning is started.

[0119] Next, with reference to FIGS. 16, 17 to 19, 22, 23, and 24, the operation of the small cleaning mode will be described. As shown in FIG. 16, the standby state of the toilet bowl cleaning is the same as that in the large cleaning mode. When receiving an instruction signal to perform small cleaning, the controller 40 operates the solenoid valve 18 provided in the first control valve 16 to open the first control valve 16. Thereafter, as shown in FIGS. 16, 17 to 19, the water reservoir portion 156 and the transmission portion 148 are in a lowered state, and the operation until the tip portion 158a of the acting portion 158 is positioned in the space between the hook members 130b is the same as that in the large cleaning mode. Therefore, the operation in the small cleaning mode up to this point will be omitted from the description, referring to the description of the operation in FIGS. 16, 17 to 19, and the large cleaning mode.

[0120] Next, as shown in FIG. 23, when the small cleaning mode is selected, the controller 40 opens the solenoid valve 18 (start cleaning), and after the elapse of the second hour, closes the solenoid valve 18 and closes the first control valve 16. The second hour is set to be shorter than the first hour. The timing at which the controller 40 closes the solenoid valve 18 (when the second hour has elapsed) is set in consideration of the timing when the piston 14b starts to descend and the clutch mechanism 130 is disengaged when the water level in the water storage tank 10 drops to the predetermined water level WL2 and the drain valve 12 seats on the drain port 10a, closing the drain port 10a, as will be described later. Since the first control valve 16 is closed, the supply of cleaning water to the drain valve hydraulic drive unit 14 and the discharge unit 54 of the cleaning water is stopped. Immediately after the supply of the cleaning water is stopped, the cleaning water is stored in the water reservoir 156 until it is almost full, and the water reservoir 156 is in a state of being lowered by the weight of the cleaning water. Therefore, the tip 158a of the acting unit 158 is located and stopped in the space between the hook members 130b.

[0121] Since the supply of the cleaning water to the drain valve hydraulic drive unit 14 of the cleaning water is stopped, the cleaning water in the cylinder 14a gradually flows out from the gap 14d, and the piston 14b is pushed down by the biasing force of the spring 14c, and at the same time the rod 32 descends. As a result, the upper end 130e of the hook member 130b abuts on the tip 158a, and the upper end 130e is rotated counterclockwise about the rotation axis 130a. Along with this rotation, the lower part of the hook member 130b and the hook 130d are rotated so as to be lifted. Therefore, the engagement between the hook 130d and the engagement claw 30c is released. As a result, the clutch mechanism 130 is disengaged and the drain valve 12 descends. The supply of the cleaning water supplied into the water storage tank 10 from the second control valve 22 via the water supply path 50 remains continued.

[0122] As shown in Fig. 24, the lowered drain valve 12 seats on the drain port 10a, closing the drain port 10a. In this way, when the small cleaning mode is executed, the drain valve 12 is held until the water level in the water storage tank 10 drops from the full water level WL to a predetermined water level WL2, and a second cleaning water volume less than the first cleaning water volume is discharged to the toilet body 2. Thereafter, the cleaning water stored in the water sump 156 is gradually discharged from the discharge hole 56b, and the water level of the cleaning water in the water sump 156 drops. When the cleaning water in the water sump 156 runs out or decreases, the water sump 156 and the transmission part 148 are raised again by the spring 149 and return to the standby position. Therefore, the operating part 158 also retreats in a direction away from the valve shaft 12a in response to the rise of the transmission part 148. As the cleaning water in the cylinder 14a of the drain valve hydraulic drive part 14 flows out, the piston 14b also further descends.

[0123] Since the float switch 42 is still in the off state, the open state of the second control valve 22 is maintained, and the water supply to the water storage tank 10 continues. The cleaning water supplied through the water supply passage 50 reaches the water supply passage branch part 50a. A part of the cleaning water branched at the water supply passage branch part 50a flows into the overflow pipe 10b, and the rest is stored in the water storage tank 10. The cleaning water flowing into the overflow pipe 10b flows into the toilet body 2 and is used for refilling the bowl part 2a. With the drain valve 12 closed, the cleaning water flows into the water storage tank 10, causing the water level in the water storage tank 10 to rise. Thereafter, when the water level in the water storage tank 10 rises to the predetermined full water level WL, the float switch 42 turns on. The operations of the cleaning water tank device 104 and the like until returning to the subsequent standby state are the same as those in the large cleaning mode shown in Fig. 22, so the description is omitted.

[0124] According to the washing water tank device 4 according to the second embodiment of the present invention described above, since the drain valve 12 and the drain valve hydraulic pressure driving unit 14 are connected by the clutch mechanism 130 and are disconnected at a predetermined timing, it is possible to move the drain valve 12 regardless of the operating speed of the drain valve hydraulic pressure driving unit 14, and the drain valve 12 can be closed. Further, when the first washing water amount is selected by the remote control device 6, the valve control unit is operated to disconnect the clutch mechanism 130 after the elapse of the first time, and the drain valve 12 is lowered after the elapse of the first time. When the second washing water amount is selected by the remote control device 6, the valve control unit is operated to disconnect the clutch mechanism 130 after the elapse of the second time, which is shorter than the first time, and the drain valve 12 is lowered after the elapse of the second time. Thus, when the second washing water amount is selected by the remote control device 6, the valve control unit can disconnect the clutch mechanism 130 so that the timing at which the drain port 10a is blocked is earlier than when the first washing water amount is selected. Therefore, according to one embodiment of the present invention, while using the clutch mechanism 130, the drain valve 12 can be lowered after the elapse of a predetermined time, and the first and second washing water amounts can be set.

[0125] As described above, the first and second embodiments of the present invention have been explained, but various modifications can be made to the above-described first or second embodiment. For example, in the above-described second embodiment, when the water storage portion 156 and the transmission portion 148 descend, the operating portion 158 advances toward the valve shaft 12a. As a modification, the rod member of the piston cylinder may be advanced toward the valve shaft 12a, and the clutch mechanism 130 may be disconnected by the rod member at an arbitrary timing. According to such a configuration, the cylinder portion of the piston cylinder is connected to the water supply passage 50 extending from the second control valve 22, and the rod member is pressed and moved by the cleaning water supplied into the cylinder portion. The rod member is formed to move laterally toward the valve shaft below the bottom surface of the drain valve hydraulic drive portion 14. The tip of the rod member is formed in a T shape, and the upper end of this T shape is disposed near the bottom surface of the drain valve hydraulic drive portion. The T-shaped portion is formed in a flat plate shape extending in the vertical direction. The upper end portion 130e of the hook member 130b hits the upper end of the T shape, the clutch mechanism 130 is disconnected, and the drain valve 12 descends.

[0126] When the large cleaning mode is selected by the controller 40, the controller 40 opens the solenoid valve 18 (cleaning start), and after the elapse of the first hour, opens the solenoid valve 24 and opens the second control valve 22. Thereby, the cleaning water is supplied from the second control valve 22 into the cylinder portion, and the rod member is moved laterally toward the valve shaft 12a. When the rod member hits the upper end portion 130e of the hook member 130b, the hook member is rotated, the clutch mechanism 130 is disconnected, and the drain valve 12 descends. The timing (after the elapse of the first hour) at which the controller 40 opens the solenoid valve is set in consideration of the timing at which the rod member abuts against the hook member 130b and the clutch mechanism 130 is disconnected so that when the water level in the water storage tank drops to the predetermined water level WL1, the drain valve 12 seats on the drain port 10a and the drain port is blocked. Thereby, the large cleaning mode for lowering the drain valve 12 and discharging the second cleaning water amount can be executed. When the small cleaning mode is selected, the controller 40 opens the solenoid valve 18 (start cleaning), and after a second time shorter than the first hour has elapsed, the controller 40 opens the solenoid valve 24 and opens the second control valve 22. As a result, the cleaning water is supplied into the cylinder part from the second control valve 22, and the rod member is moved laterally toward the valve shaft 12a. When the rod member hits the upper end 130e of the hook member 130b, the hook member is rotated, the clutch mechanism 130 is disengaged, and the drain valve 12 is lowered. The timing (after the second time has elapsed) at which the controller 40 opens the solenoid valve is set in consideration of the timing at which the rod member abuts against the hook member and the clutch mechanism 130 is disengaged so that when the water level in the water storage tank 10 drops to a predetermined water level WL2 as described later, the drain valve 12 seats on the drain port 10a and the drain port is blocked. Thereby, the small cleaning mode for lowering the drain valve 12 and discharging the second cleaning water volume can be executed.

[0127] For example, in the second embodiment described above, the operating portion 158 advanced toward the valve shaft 12a when the water reservoir portion 156 and the transmission portion 148 descended. As a modification, the cleaning water may be discharged from the discharge portion toward the clutch mechanism 130, and the clutch mechanism 130 may be lowered at an arbitrary timing and disengaged by the discharged cleaning water. Similar to the second embodiment, the clutch mechanism 130 is configured not to be disengaged only when the drain valve 12 is pulled up. When the supply of the cleaning water to the drain valve hydraulic drive portion 14 is stopped and the piston 14b moves downward, the clutch mechanism 130 gradually descends while remaining in the connected state. At a position lower than the highest lifted height position, for example, the hook member 130b of the clutch mechanism 130 is rotated by the cleaning water discharged from the discharge portion, and the clutch mechanism 130 is disengaged.

[0128] In such a configuration, the first control valve 16, the drain valve hydraulic drive unit 14, and the discharge unit function as a valve control unit. The valve control unit is formed so as to be able to disconnect the clutch mechanism 130 at a predetermined timing. The washing water tank device 4 includes such a valve control unit. When the first washing water volume is selected by the remote control device 6 or the like, the valve control unit operates such that the washing water discharged from the discharge unit acts on the clutch mechanism 130 to disconnect the clutch mechanism 130 after the elapse of the first time, and lowers the drain valve 12 after the elapse of the first time. Therefore, the drain valve 12 is lowered at a timing corresponding to the original predetermined water level WL1, and the large washing mode can be executed. Also, when the second washing water volume is selected by the remote control device 6 or the like, the valve control unit operates such that the washing water discharged from the discharge unit acts on the clutch mechanism 130 to disconnect the clutch mechanism 130 after the elapse of the second time, which is shorter than the first time, and lowers the drain valve 12 after the elapse of the second time. Therefore, the drain valve 12 is lowered at a timing corresponding to the original predetermined water level WL2, and the small washing mode can be executed. Although each modification example has been illustrated as described above, the structures of each modification example, the structure of the first embodiment, and the structure of the second embodiment can be arbitrarily recombined or extracted and changed.

[0129] Next, with reference to the accompanying drawings, a flushing toilet device according to a third embodiment of the present invention will be described. The flushing toilet device 1 according to the third embodiment is different from the above-described second embodiment in that the clutch mechanism 230 is disposed outside the drain valve casing 213. Here, only the points different from the second embodiment of the third embodiment of the present invention will be described, and the same parts will be denoted by the same reference numerals in the drawings and the description thereof will be omitted. FIG. 25 is a cross-sectional view showing a schematic configuration of a washing water tank device according to the third embodiment of the present invention.

[0130] As shown in FIG. 25, the washing water tank device 204 according to the third embodiment of the present invention is provided in the flushing toilet device 1 (see FIG. 1) in the same manner as in the first embodiment of the present invention.

[0131] The wash water tank device 204 supplies wash water to the wash toilet body 2. The wash water tank device 204 has a drain valve hydraulic drive unit 214 that drives the drain valve 12.

[0132] The wash water tank device 204 has a clutch mechanism 230 that, when disengaged, lowers the drain valve 12. This clutch mechanism 230 connects the drain valve 12 and the drain valve hydraulic drive unit 214 and pulls up the drain valve 12 by the driving force of the drain valve hydraulic drive unit 214.

[0133] The drain valve 12 is pulled up by the driving force of the drain valve hydraulic drive unit 214. The clutch mechanism 230 is disengaged at a predetermined height or at a predetermined timing, and the drain valve 12 descends due to its own weight. By controlling the predetermined time until the clutch mechanism 230 is disengaged after the drain valve 12 is pulled up, the drain valve 12 is lowered, and the time until the drain valve 12 seats on the drain port 10a is adjusted. The drain valve 12 is disposed inside the drain valve casing 213. The drain valve casing 213 is formed so as to cover the upper side and the outer peripheral side of the drain valve 12. The drain valve casing 213 is formed in a cylindrical shape that covers the upper side of the drain valve 12. The drain valve casing 213 is formed from underwater below the full water level WL of the wash water to above the air above the full water level WL. The drain valve casing 213 is fixed to the floor surface of the water storage tank 10 at the base. The drain valve casing 213 is not fixed to the drain valve hydraulic drive unit 214 and is provided independently of the drain valve hydraulic drive unit 214 inside the water storage tank 10.

[0134] The drain valve hydraulic drive unit 214 is configured to drive the drain valve 12 by utilizing the water supply pressure of the cleaning water supplied from the water supply. Specifically, the drain valve hydraulic drive unit 214 includes a cylinder 14a into which the water supplied from the first control valve 16 flows, a piston 14b slidably disposed within the cylinder 14a, and a rod 232 protruding from one end of the cylinder 14a to drive the drain valve 12. The drain valve hydraulic drive unit 214 is a horizontally placed drain valve hydraulic drive unit that drives the piston 14b and the rod 232 horizontally. The drain valve hydraulic drive unit 214 is disposed separately from the drain valve casing 213 outside the drain valve casing 213 that houses the drain valve 12 inwardly.

[0135] Furthermore, a spring 14c is disposed inside the cylinder 14a, biasing the piston 14b laterally toward the first end portion 14g on the side of the drain valve 12. A packing 14e is attached to the piston 14b to ensure watertightness between the inner wall surface of the cylinder 14a and the piston 14b. Further, a clutch mechanism 230 is provided at the other end of the rod 232, and the clutch mechanism 230 connects and disconnects the rod 232 and a connecting member 270 connected to the valve shaft 12a of the drain valve 12.

[0136] The cylinder 14a is a cylindrical member, arranged such that its axis is horizontal, for example, in the horizontal direction, and laterally receives the piston 14b slidably inside. A drive unit water supply passage 34a is connected to the first end portion 14g on the side of the drain valve 12 of the cylinder 14a, and the cleaning water flowing out from the first control valve 16 flows into the cylinder 14a. Therefore, the piston 14b inside the cylinder 14a is driven laterally from the first end portion 14g toward the second end portion 14h against the biasing force of the spring 14c by the cleaning water flowing into the cylinder 14a.

[0137] On one side, an outflow hole is provided at the upper part of the cylinder 14a, and the drive unit drain passage 34b communicates with the inside of the cylinder 14a through this outflow hole. Therefore, when the cleaning water flows into the cylinder 14a from the drive unit water supply passage 34a connected to the cylinder 14a, the piston 14b is pushed forward from the portion on the first end 14g side of the cylinder 14a, which is the first position, toward the second end 14h. The piston 14b is driven by the pressure of the cleaning water flowing into the cylinder. When the piston 14b is pushed forward to the second position on the second end 14h side of the outflow hole, the water flowing into the cylinder 14a flows out from the outflow hole through the drive unit drain passage 34b. That is, when the piston 14b is moved to the second position, the drive unit water supply passage 34a and the drive unit drain passage 34b communicate with each other through the inside of the cylinder 14a. A discharge portion 54 is formed at the tip of the drive unit drain passage 34b extending from the cylinder 14a. In this way, the drive unit drain passage 34b forms a flow path extending to the discharge portion 54.

[0138] The rod 232 is a rod-shaped member connected to the side surface of the piston 14b on the drain valve 12 side, and extends so as to protrude laterally from the inside of the cylinder 14a through the through hole 14f formed in the side surface of the cylinder 14a. The rod 232 is connected to the piston 14b inside the cylinder 14a and is also connected to the clutch mechanism 230 outside the cylinder 14a. A gap 14d is provided between the rod 232 protruding from the side of the cylinder 14a and the inner wall of the through hole 14f of the cylinder 14a, and a part of the cleaning water flowing into the cylinder 14a flows out from this gap 14d. The water flowing out from the gap 14d flows into the water storage tank 10. Since this gap 14d is relatively narrow and the flow path resistance is large, even when water is flowing out from the gap 14d, the pressure inside the cylinder 14a increases due to the cleaning water flowing into the cylinder 14a from the drive unit water supply passage 34a, and the piston 14b is pushed forward toward the second end 14h against the biasing force of the spring 14c.

[0139] The first control valve 16 is configured to control the water supply to the drain valve hydraulic drive unit 214 based on the operation of the solenoid valve 18, and also to control the water supply and stop to the discharge unit 54. Therefore, the first control valve 16 is provided in the flow path that supplies cleaning water to the discharge unit 54 and the like, which is a valve control unit described later, and controls the supply of cleaning water to the discharge unit 54 and the like, which is a valve control unit. Therefore, the first control valve 16 supplies cleaning water to the discharge unit 54 and the like via the drain valve hydraulic drive unit 214.

[0140] The float switch 42 is disposed in the water storage tank 10, and is configured to stop the water supply from the first control valve 16 to the drain valve hydraulic drive unit 214 when the water level in the water storage tank 10 rises to the full water level WL.

[0141] Next, with reference to FIG. 25 and the like, the configuration and operation of the clutch mechanism 230 will be described. The clutch mechanism 230 in the third embodiment has substantially the same structure and operating principle as the clutch mechanism 130 in the second embodiment. The clutch mechanism 230 in the third embodiment is a horizontal clutch mechanism provided horizontally at the end of a horizontally extending rod 232, whereas the clutch mechanism 130 in the second embodiment is a vertical clutch mechanism provided vertically at the end of a vertically extending rod 32, which is different. The clutch mechanism 230 in the third embodiment has substantially the same structure as the clutch mechanism 130 in the second embodiment except that it is mounted horizontally and moved horizontally, so the description of the common parts will be omitted and mainly the different parts will be described.

[0142] First, as shown in FIG. 25, the clutch mechanism 230 is provided at the end of a rod 232 that extends laterally from the drain valve hydraulic drive unit 214, and is configured to connect and disconnect the end of the rod 232 on the drain valve side and the upstream end of the connection member 270. The clutch mechanism 230 forms a lateral clutch mechanism that is moved laterally to connect and disconnect the clutch mechanism connection portion 272 that is aligned laterally with the rod 232. More specifically, the clutch mechanism 230 is formed such that, by the movement of a hook member 130b described later, the rod 232 and the clutch mechanism connection portion 272 are separated laterally or the rod 232 and the clutch mechanism connection portion 272 are engaged laterally. The clutch mechanism 230 is provided at approximately the same height as the rod 232. The clutch mechanism 230 includes a rotation shaft 130a attached to the lower end of the rod 232, a hook member 130b supported by the rotation shaft 130a, an engagement claw 30c provided at the end of the clutch mechanism side of the clutch mechanism connection portion 272 described later, and a stop plate 130f that defines the upper limit of the lifting position of the clutch mechanism 230. With such a structure, the clutch mechanism 230 is disconnected at a predetermined timing and a predetermined lifting height (the lifting height of the drain valve 12), and the drain valve 12 is lowered.

[0143] The hook member 130b is formed so as to spread upward in a V-shape from the rotation axis 130a. Among the hook member 130b, the drain valve hydraulic pressure driving part side portion extending from the rotation axis 130a toward the drain valve hydraulic pressure driving part forms the drain valve hydraulic pressure driving part side end 130e of the hook member 130b. The drain valve hydraulic pressure driving part side end 130e of the hook member 130b is formed to have a length and position such that it does not contact the bottom surface of the drain valve hydraulic pressure driving part 214 even when the piston 14b is in the most raised state (pushed forward state). Among the hook member 130b, the drain valve side portion extending from the rotation axis 130a toward the drain valve forms the hook 130d of the hook member 130b that extends obliquely upward as a V-shaped portion and then returns toward the clutch mechanism connection part 272. The engaging claw 30c is a plate-shaped claw. The bottom side of the engaging claw 30c is formed in the vertical direction. The stop plate 130f is formed such that the stop plate 130f contacts the bottom surface of the drain valve hydraulic pressure driving part 214 before the drain valve hydraulic pressure driving part side end 130e of the hook member 130b in the connected state contacts the bottom surface of the drain valve hydraulic pressure driving part 214, thereby stopping the lifting of the drain valve 12 and the like.

[0144] In the state shown in FIG. 25, the drain valve 12 is seated on the drain port 10a, and the drain port 10a is closed. Also, in this state, the drain valve hydraulic pressure driving part 214 and the drain valve 12 are connected. In this connected state, the hook 130d of the hook member 130b is engaged with the bottom side of the engaging claw 30c, and the drain valve 12 can be lifted by the rod 232. With such a configuration, for example, the clutch mechanism 230 functions as a timing control mechanism, and while the clutch mechanism 230 is engaged with the drain valve 12 via the connection member 270, the descent of the drain valve 12 is stopped, and the timing at which the drain port is closed can be controlled. Also, for example, the clutch mechanism 230 and the acting part 258 described later may function as a timing control mechanism.

[0145] The clutch mechanism 230 is disposed at a position on the side of the drain valve hydraulic drive unit 214 between the drain valve hydraulic drive unit 214 and the drain valve casing 213 (or the drain valve 12). For example, in the standby state, the clutch mechanism 230 is disposed at a position closer to the drain valve hydraulic drive unit 214 than half of the lengths of the rod 232 and the connecting member 270 from the drain valve hydraulic drive unit 214 to the drain valve casing 213 (or the drain valve 12). Note that the clutch mechanism 230 is disposed at a position closer to the drain valve hydraulic drive unit 214 than the end on the drain valve hydraulic drive unit side of the flexible member 174 formed by a wire. Further, the clutch mechanism 230 is disposed at a position closer to the drain valve hydraulic drive unit 214 than the end on the drain valve hydraulic drive unit side of the clutch mechanism connection portion 272.

[0146] Since the clutch mechanism 230 is disposed at a position on the side of the drain valve hydraulic drive unit 214 between the drain valve hydraulic drive unit 214 and the drain valve casing 213, the degree of freedom in setting the position where the clutch mechanism 230 is disconnected, the degree of freedom in the arrangement position of the clutch mechanism 230, and the degree of freedom in the structure of the clutch mechanism 230 can be improved as compared with the case where it is disposed at a position closer to the drain valve casing 213 side near the water surface. Also, the degree of freedom in the arrangement position of the operating portion 258 or the like for disconnecting the clutch mechanism 230 and the degree of freedom in the structure of the operating portion 258 or the like can be improved. Further, the distance between the drain valve hydraulic drive unit 214 and the clutch mechanism 230 in the standby state is shorter than the distance between the drain valve casing 213 (or the drain valve 12) and the clutch mechanism 230 in the standby state. Also, the height difference between the drain valve hydraulic drive unit 214 and the clutch mechanism 230 in the standby state is shorter than the height difference between the drain valve casing 213 (or the drain valve 12) and the clutch mechanism 230 in the standby state.

[0147] The connecting member 270 connects the clutch mechanism 230 and the valve shaft 12a. The connecting member 270 is longer than the rod 232. The connecting member 270 includes a clutch mechanism connecting portion 272 connected to the clutch mechanism 230 and a flexible member 274 formed by a wire connecting the clutch mechanism connecting portion 272 and the valve shaft 12a. The clutch mechanism connecting portion 272 extends along the same axis as the rod 232. The clutch mechanism connecting portion 272 is formed in a rigid rod shape. The clutch mechanism connecting portion 272 forms an engaging claw 30c.

[0148] The flexible member 274 is disposed within a tube 276 extending from the drain valve casing 213. The flexible member 274 is deformable along the shape of the tube 276. The flexible member 274 is curved and disposed along the shape of the curved tube 276. When one end portion of the flexible member 274 is moved by a certain amount of movement, the other end portion is moved by the same certain amount of movement. In this way, the flexible member 274 transmits the pulling-up operation from one end portion or the pulling-down operation from the other end portion as the pulling-up operation of the other end portion or the pulling-down operation of one end portion. The flexible member 274 can connect the drain valve hydraulic drive unit 214 and the drain valve 12 regardless of their arrangement positions and can transmit the pulling-up operation and the like. Thereby, the drain valve hydraulic drive unit 214 and the drain valve 12 can be arranged at more free positions. The flexible member 274 may be formed by other connecting members such as a chain or a bead chain.

[0149] Returning to FIG. 25 again, the water reservoir portion and the like of the washing water tank device 204 will be described. The washing water tank device 204 further includes a discharge portion 54 that discharges the supplied washing water, a water reservoir portion 156 that stores the washing water discharged from the discharge portion 54, a transmission portion 248 connected to the water reservoir portion 156, and an acting portion 258 that is connected to the transmission portion 248 and moves vertically.

[0150] The drain valve hydraulic drive unit 214, the discharge unit 54, the water reservoir unit 156, the transmission unit 148, and the acting unit 158 function as a valve control unit in whole or in part. The valve control unit is formed so as to be able to disconnect the clutch mechanism 230 at a predetermined timing. At this time, the clutch mechanism 230 can function as a timing control mechanism. The washing water tank device 204 is provided with such a valve control unit. When the first washing water volume is selected by the remote control device 6 or the like, the valve control unit operates to disconnect the clutch mechanism 230 after the elapse of the first time, and lowers the drain valve 12 after the elapse of the first time. Also, when the second washing water volume is selected by the remote control device 6 or the like, the valve control unit operates to disconnect the clutch mechanism 230 after the elapse of the second time, which is shorter than the first time, and lowers the drain valve 12 after the elapse of the second time. Thus, the valve control unit is formed to be operated by the supplied washing water. Note that such a valve control unit is not limited to a water supply type valve control unit in which the water reservoir unit 156 and the acting unit 158 etc. are driven by the washing water supplied to the water reservoir unit 156 as described above, and may be an electric drive type valve control unit in which the acting unit 158 etc. are driven by a drive unit that is electrically driven without including the water reservoir unit 156, or may be a physical type valve control unit in which the acting unit 158 etc. are biased in a direction to disconnect the clutch mechanism by a physical structure such as a spring without relying on means such as an electric drive unit, and the clutch mechanism is disconnected at a predetermined timing.

[0151] When the second amount of washing water is selected by the remote control device 6, the discharge unit 54 discharges the supplied washing water. Also, the discharge unit 54 is provided to discharge the washing water even when the first amount of washing water is selected by the remote control device 6. The discharge unit 54 is formed at the lower end of the drive unit drain passage 34b and extends downward. The discharge unit 54 is provided above the upper surface of the drain valve casing 213. The discharge unit 54 is disposed outside the drain valve casing 213. The discharge unit 54 forms a tapered and downward discharge port. Therefore, the washing water is accelerated downward by gravity, and since the flow path is narrowed at the discharge port, its flow velocity is further accelerated. The discharge unit 54 is disposed inside the side wall of the water reservoir portion 156 and above the full water level WL.

[0152] The water reservoir portion 156 is disposed above the drain valve casing 213. The discharge hole 56b is formed in the lower part of the side wall of the water reservoir portion 156 and forms a small hole with a relatively small diameter.

[0153] The transmission unit 248 forms a rod-shaped member that extends vertically downward from the lower surface of the water reservoir portion 156. The transmission unit 248 is fixed to the lower surface of the water reservoir portion 156. The transmission unit 248 is not fixed to the rod 232 and is slidably disposed with respect to the rod 232. A spring 249 is disposed outside the transmission unit 248, and the spring 249 is provided between the water reservoir portion 156 and the drain valve hydraulic drive unit 214. Therefore, after the water reservoir portion 156 and the transmission unit 248 descend, when the weight of the water reservoir portion 156 becomes lighter, the water reservoir portion 156 and the transmission unit 248 are raised again by the spring 249 and return to the standby position. The transmission unit 248 is connected to the acting unit 258. The transmission unit 248 can move up and down in accordance with the vertical movement of the water reservoir portion 156 and can cause the acting unit 258 to move up and down. In this way, the transmission unit 248 and the acting unit 258 are configured to move up and down along the virtual line B2.

[0154] The actuating portion 258 is formed so as to be movable in the vertical direction at a position laterally of the first end portion 14g of the bottom surface of the drain valve hydraulic driving portion 214 and above the rod 232. In FIG. 25, the position of the actuating portion 258 in the standby state is shown by a solid line, and the actuating portion 258 in a state of being moved downward toward the rod 232 is shown by an imaginary line B3. When the transmission portion 248 is lowered, the actuating portion 258 moves downward so as to advance toward the rod 232. The tip portion 258a of the actuating portion 258 can be positioned in the space between the hook members 130b that open in a V shape in a state where it has advanced and the hook member 130b is pulled up most (the state where it has advanced most toward the drain valve hydraulic driving portion 214 side). Further, when the transmission portion 248 is raised, the actuating portion 258 moves upward so as to retreat away from the rod 232. The tip portion 258a of the actuating portion 258 forms a relatively large protruding portion with a semicircular cross section. The actuating portion 258 controls the timing of lowering the drain valve 12 so that the timing at which the drain port 10a is closed when the second washing water amount is selected becomes earlier than when the first washing water amount is selected, in conjunction with the operations of the transmission portion 248, the water reservoir portion 156, and the like.

[0155] In a state where the water reservoir portion 156 and the transmission portion 248 are lowered, the actuating portion 258 extends from the drain valve hydraulic driving portion side end portion 130e of the hook member 130b to the rod 232 side. If the actuating portion 258 simply moves only to the space between the hook members 130b that open in a V shape, the hook member 130b is not actuated. When the supply of washing water to the drain valve hydraulic driving portion 214 is stopped and the piston 14b moves toward the drain valve side, the drain valve hydraulic driving portion side end portion 130e of the hook member 130b contacts the actuating portion 258 as the rod 232 moves, and the hook member 130b rotates to disconnect the clutch mechanism 230.

[0156] As a modification, a case where a physical valve control portion is configured instead of the water supply type valve control portion of the present embodiment will be described. In this modification example, instead of the discharge part 54 and the water storage part 156 of the washing water tank device 204, the washing water tank device 204 includes a spring type transmission part formed by a spring fixed in the water storage tank 10, and an acting part connected to the spring type transmission part and moved vertically. At this time, the drain valve hydraulic drive part 214, the spring type transmission part, and the acting part function as a valve control part in whole or in part. This valve control part is formed so as to be able to disconnect the clutch mechanism 230 at a predetermined timing. At this time, the clutch mechanism 230 can function as a timing control mechanism.

[0157] The spring type transmission part in the above modification example is arranged above the drain valve casing 213. Also, the spring type transmission part 248 is arranged above the rod 232. The spring type transmission part 248 is fixed above the rod 232 and extends downward. The spring type transmission part forms a spring-like member extending vertically downward. An acting part is fixed to the lower end of the spring type transmission part. The spring type transmission part is not fixed to the rod 232 and is arranged so as to be slidable in the vertical direction with respect to the rod 232. When the hook member 130b of the clutch mechanism 230 acts on the inclined surface (described later) of the acting part from the drain valve side, the spring type transmission part receives a relatively large upward force from the inclined surface, expands and contracts upward, and can escape without applying a relatively large load to the hook member 130b. On the other hand, when the hook member 130b of the clutch mechanism 230 acts on the vertical surface (described later) of the acting part 258 from the drain valve hydraulic drive part side, the spring type transmission part receives a relatively large lateral force from the vertical surface, is difficult to expand and contract upward, applies a relatively large load to the hook member 130b, rotates the hook member 130b, and disconnects the clutch mechanism 230. When the spring type transmission part does not receive a force from the hook member 130b, it returns to its natural length and returns to the standby position.

[0158] In the above-described modification, the operating portion forms a structure having a substantially triangular shape at the lower portion in a side view. The operating portion is formed such that, at the lower portion, the surface on the drain valve side is an inclined surface that inclines from the outside to the inside as it goes from the upper portion to the lower portion, and the surface on the side of the drain valve hydraulic drive portion is a vertical surface that extends in the vertical direction. The operating portion is positioned at a height where it can act on the hook member 130b when the spring transmission portion is in a standby state with its natural length. The operating portion is formed so as to be movable in the vertical direction at a position laterally of the first end portion 14g of the bottom surface of the drain valve hydraulic drive portion 214 and above the rod 232 by the spring transmission portion. When the spring transmission portion contracts, the operating portion moves upward so as to move away from the rod 232. The tip of the operating portion can be positioned in the space between the hook members 130b that open in a U-shape in a state where the hook member 130b has advanced and in a state where the hook member 130b is most lifted (in a state where it has advanced most toward the drain valve hydraulic drive portion 214 side). The tip of the operating portion forms a downward projecting portion with the vertical surface and the inclined surface. The operating portion controls the timing of lowering the drain valve 12 so that, in conjunction with the operations of the drain valve hydraulic drive portion 214, the transmission portion, etc., when the second washing water volume is selected, the timing at which the drain port 10a is closed is earlier than when the first washing water volume is selected.

[0159] In the operating portion in the above-described modification, after the hook member 130b once pushes up the inclined surface of the operating portion and advances toward the drain valve hydraulic drive portion 214 side, in a standby state where the spring transmission portion returns to its natural length, it extends from the end portion 130e on the drain valve hydraulic drive portion side of the hook member 130b to the rod 232 side. If the operating portion simply moves only to the space between the hook members 130b that open in a U-shape, the hook member 130b is not actuated. When the supply of washing water to the drain valve hydraulic drive portion 214 is stopped and the piston 14b moves toward the drain valve side, the end portion 130e on the drain valve hydraulic drive portion side of the hook member 130b contacts the vertical surface of the operating portion as the rod 232 moves, and the hook member 130b rotates to disconnect the clutch mechanism 230.

[0160] Next, with reference to FIG. 25, the operation of the washing water tank device 204 according to the third embodiment of the present invention and the flush toilet device 1 equipped with the same will be described. The clutch mechanism 230 in the third embodiment has substantially the same structure and operating principle as the clutch mechanism 130 in the second embodiment. Also, the operation of the acting part 258 on the clutch mechanism 230 in the third embodiment is substantially the same as the operation of the acting part 158 on the clutch mechanism 130 in the second embodiment. Therefore, for the operation of the acting part 258 on the clutch mechanism 230 in the third embodiment as well, the common explanations and illustrations are omitted with reference to the explanations of the operation of the acting part 158 on the clutch mechanism 130 in the second embodiment and FIGS. 17 to 24 etc.

[0161] First, in the standby state of toilet bowl cleaning shown in FIG. 25, the water level in the water storage tank 10 is at a predetermined full water level WL. In this state, both the first control valve 16 and the second control valve 22 are closed. The water reservoir part 156 stores no cleaning water, and the water reservoir part 156 and the transmission part 248 are biased to the upper position by the spring 249. The acting part 258 is pulled by the transmission part 248 and is located at a position retracted with respect to the rod 232. Next, when the user presses the large cleaning button of the remote control device 6, the remote control device 6 transmits an instruction signal for executing the large cleaning mode to the controller 40. Also, when the small cleaning button is pressed, an instruction signal for executing the small cleaning mode is transmitted to the controller 40.

[0162] Next, with reference to FIG. 25, the operation in the large cleaning mode will be described. When the controller 40 receives an instruction signal indicating that a large cleaning should be performed, it operates the solenoid valve 18 provided in the first control valve 16 to disengage the pilot valve 16d on the solenoid valve side from the pilot valve port. When the first control valve 16 is opened, the cleaning water flowing in from the water supply pipe 38 is supplied to the drain valve hydraulic drive unit 214 via the first control valve 16. As a result, the piston 14b of the drain valve hydraulic drive unit 214 is pushed forward, the drain valve 12 is pulled up via the rod 232, and the cleaning water in the water storage tank 10 is discharged from the drain port 10a to the flush toilet body 2. At this time, the pilot valve 16d remains open, and the cleaning water flowing in from the water supply pipe 38 continues to be supplied to the drain valve hydraulic drive unit 214 via the first control valve 16. The piston 14b is moved to the second position (the state where it is pushed most to the second end portion 14h side), and the drive unit water supply passage 34a and the drive unit drain passage 34b communicate with each other through the inside of the cylinder 14a, so that the cleaning water is discharged from the discharge portion 54 to the water reservoir portion 156. Therefore, after the drain valve hydraulic drive unit 214 raises the drain valve 12, the supply of the cleaning water from the first control valve 16 to the water reservoir portion 156 is started. Due to the movement of the piston 14b and the rod 232, even when the rod 232 moves to the drain valve hydraulic drive unit side and the stop plate 130f abuts against the bottom surface of the drain valve hydraulic drive unit 214, the end portion 130e of the hook member 130b of the clutch mechanism 230 on the drain valve hydraulic drive unit side does not abut against the bottom surface of the drain valve hydraulic drive unit 214. Therefore, the clutch mechanism 230 remains connected. Therefore, the drain valve 12 is held in the pulled-up state. On the other hand, the supply of the cleaning water to the water reservoir portion 156 is started, and as the water reservoir portion 156 and the transmission portion 248 gradually descend, the actuating portion 258 starts to move downward toward the hook member 130b on the rod 232 side. Note that the controller 40 keeps the second control valve 22 closed.

[0163] As shown in FIGS. 18 and 25 and the like, the washing water continues to be supplied to the drain valve hydraulic drive unit 214 via the first control valve 16. The piston 14b of the drain valve hydraulic drive unit 214 is in the most pushed-up state (pushed-forward state), and the rod 232 and the clutch mechanism 230 are also in the most pulled-up state. Since the piston 14b is in the second position (the most pushed-up state), the washing water is supplied from the drain valve hydraulic drive unit 214 to the discharge unit 54. When the water level of the washing water in the water reservoir 156 substantially reaches the full water level in the water reservoir 156, the water reservoir 156 and the transmission unit 248 are lowered by the weight of the washing water. Due to the lowering of the transmission unit 248, the acting unit 158 is lowered toward the rod 232 side. The tip 258a of the acting unit 258 is located in the space between the hook members 130b that are stationary in the most pulled-up state. The drain valve hydraulic drive unit side end 130e of the hook member 130b is located above the tip 258a and is separated from the tip 258a. Therefore, the clutch mechanism 230 still does not reach disengagement and continues to be in the holding state.

[0164] Next, as shown in FIGS. 19 and 25 and the like, when the water level in the water storage tank 10 drops, the float switch 42 that detects the water level in the water storage tank 10 turns off. When the float switch 42 turns off, the pilot valve 22c provided in the second control valve 22 opens. Therefore, the washing water is supplied from the second control valve 22 into the water storage tank 10 via the water supply passage 50. When the pilot valve 22c opens, when the large washing mode is selected, the controller 40 keeps the pilot valve 16d on the side of the solenoid valve 18 open. The washing water flowing in from the water supply pipe 38 is still discharged from the discharge unit 54 to the water reservoir 156 via the first control valve 16 and the drain valve hydraulic drive unit 14. Therefore, the amount of washing water in the water reservoir 156 does not decrease, and the substantially full water level of the water reservoir 156 is maintained. Therefore, the water reservoir 156 and the transmission unit 248 are in the lowered state, and the tip 258a of the acting unit 258 is located in the space between the hook members 130b.

[0165] Next, as shown in FIGS. 20 and 25 etc., when the large cleaning mode is selected, the controller 40 opens the solenoid valve 18 (start cleaning), and after one hour has elapsed, closes the solenoid valve 18 and closes the first control valve 16. The timing (after one hour has elapsed) at which the controller 40 closes the solenoid valve 18 is set in consideration of the timing when the piston 14b starts to descend and the clutch mechanism 230 is disengaged when the water level in the water storage tank 10 drops to a predetermined water level WL1 and the drain valve 12 seats on the drain port 10a, closing the drain port 10a, as will be described later. Since the first control valve 16 is closed, the supply of cleaning water to the drain valve hydraulic pressure drive unit 214 and the discharge unit 54 is stopped. Immediately after the supply of cleaning water stops, the cleaning water is stored in the water reservoir 156 until it is almost full, and the water reservoir 156 is in a state of being lowered by the weight of the cleaning water. Therefore, the tip 258a of the working unit 258 is located and stopped in the space between the hook members 130b.

[0166] Also, since the supply of cleaning water to the drain valve hydraulic pressure drive unit 214 stops, the cleaning water in the cylinder 14a gradually flows out from the gap 14d, and the piston 14b is pushed down by the biasing force of the spring 14c. Along with this, the rod 232 moves to the right in the drawing and moves toward the drain valve side. As a result, the drain valve hydraulic pressure drive unit side end 130e of the hook member 130b abuts on the tip 258a, and the drain valve hydraulic pressure drive unit side end 130e is rotated counterclockwise about the rotation axis 130a. Along with this rotation, the lower part of the hook member 130b and the hook 130d are rotated so as to be lifted (see FIG. 20). Therefore, the engagement between the hook 130d and the engagement claw 30c is released. As a result, the clutch mechanism 230 is disengaged and the drain valve 12 descends. The supply of cleaning water supplied from the second control valve 22 into the water storage tank 10 via the water supply path 50 continues as before.

[0167] As shown in FIGS. 21 and 25 etc., the lowered drain valve 12 seats on the drain port 10a, and the drain port 10a is blocked. Thus, when the large cleaning mode is executed, the drain valve 12 is held until the water level in the water storage tank 10 drops from the full water level WL to a predetermined water level WL1, and the first cleaning water volume is discharged to the toilet body 2. Thereafter, the cleaning water stored in the water reservoir 156 is gradually discharged from the discharge hole 56b, and the water level of the cleaning water in the water reservoir 156 drops. When the cleaning water in the water reservoir 156 runs out or decreases, the water reservoir 156 and the transmission part 248 are raised again by the spring 249 and return to the standby position. Therefore, the acting part 258 also retreats in a direction away from the rod 232 in response to the rise of the transmission part 248. Along with the outflow of the cleaning water in the cylinder 14a of the drain valve hydraulic drive part 14, the piston 14b further moves back to the drain valve side.

[0168] Since the float switch 42 is still in the off state, the open state of the second control valve 22 is maintained, and the water supply to the water storage tank 10 continues. The cleaning water supplied through the water supply passage 50 reaches the water supply passage branch part 50a. A part of the cleaning water branched at the water supply passage branch part 50a flows into the overflow pipe 10b, and the rest is stored in the water storage tank 10. With the drain valve 12 closed, the cleaning water flows into the water storage tank 10, causing the water level in the water storage tank 10 to rise.

[0169] As shown in FIGS. 22 and 25 etc., when the water level in the water storage tank 10 rises to the predetermined full water level WL, the float switch 42 turns on. When the float switch 42 is turned on, the pilot valve 22c on the float switch side closes. As a result, since the pilot valve 22c is in the closed state, the pressure in the pressure chamber 22b rises, the main valve body 22a of the second control valve 22 closes, and the water supply stops.

[0170] Furthermore, as the cleaning water in the cylinder 14a of the drain valve hydraulic drive unit 14 gradually flows out from the gap 14d, the piston 14b is pushed down by the biasing force of the spring 14c, and together with this, the rod 232 is moved toward the drain valve side. When the hook portion 130d is lowered to the position of the engagement claw 30c, it descends along the inclined surface of the engagement claw 30c, overrides the engagement claw 30c, and then is rotated back to its original position by gravity. The hook portion 130d engages with the engagement claw 30c again, the clutch mechanism 230 is connected, and the rod 232 and the valve shaft 12a are in a connected state. Therefore, it returns to the standby state before the toilet bowl cleaning is started.

[0171] Next, with reference to FIGS. 17 to 19, FIGS. 22, 23, 24, and 25, the operation of the small cleaning mode will be described. As shown in FIG. 25, the standby state of the toilet bowl cleaning is the same as that in the large cleaning mode. When receiving an instruction signal to perform small cleaning, the controller 40 operates the solenoid valve 18 provided in the first control valve 16 to open the first control valve 16. Thereafter, the operation until the water reservoir portion 156 and the transmission portion 248 are in a lowered state and the tip portion 258a of the acting portion 258 is positioned in the space between the hook members 130b, as shown in FIGS. 17 to 19, FIG. 25, etc., is the same as that in the large cleaning mode. Therefore, the operation in the small cleaning mode up to this point will be omitted from the description by referring to the description of the operation in FIGS. 17 to 19, FIG. 25, etc. and the large cleaning mode.

[0172] Next, as shown in FIGS. 23 and 25, etc., when the small cleaning mode is selected, the controller 40 opens the solenoid valve 18 (start cleaning), and after the elapse of the second hour, closes the solenoid valve 18 and closes the first control valve 16. The second hour is set to be shorter than the first hour. The timing at which the controller 40 closes the solenoid valve 18 (when the second hour has elapsed) is set in consideration of the timing when the water level in the water storage tank 10 drops to a predetermined water level WL2 as described later, the drain valve 12 seats on the drain port 10a, and the drain port 10a is blocked, the piston 14b starts to descend, and the clutch mechanism 230 is disengaged. Since the first control valve 16 is closed, the supply of the cleaning water to the drain valve hydraulic pressure driving unit 214 and the discharge unit 54 is stopped. Immediately after the supply of the cleaning water is stopped, the cleaning water is stored in the water reservoir 156 until it is almost full, and the water reservoir 156 is in a state of being lowered by the weight of the cleaning water. Therefore, the tip 258a of the working unit 258 is located and stopped in the space between the hook members 130b.

[0173] Since the supply of the cleaning water to the drain valve hydraulic pressure driving unit 214 is stopped, the cleaning water in the cylinder 14a gradually flows out from the gap 14d, the piston 14b is pushed down by the biasing force of the spring 14c, and together with this, the rod 232 is moved toward the drain valve side. As a result, the drain valve hydraulic pressure driving unit side end 130e of the hook member 130b abuts on the tip 258a, and the drain valve hydraulic pressure driving unit side end 130e is rotated counterclockwise about the rotation shaft 130a. Along with this rotation, the lower portion of the hook member 130b and the hook 130d are rotated so as to be lifted. Therefore, the engagement between the hook 130d and the engagement claw 30c is released. As a result, the clutch mechanism 230 is disengaged and the drain valve 12 descends. The supply of the cleaning water supplied from the second control valve 22 into the water storage tank 10 via the water supply path 50 remains continued.

[0174] As shown in FIGS. 24 and 25 and the like, the lowered drain valve 12 seats on the drain port 10a, and the drain port 10a is closed. In this way, when the small cleaning mode is executed, the drain valve 12 is held until the water level in the water storage tank 10 drops from the full water level WL to a predetermined water level WL2, and a second cleaning water amount less than the first cleaning water amount is discharged to the toilet body 2. Thereafter, the cleaning water stored in the water reservoir 156 is gradually discharged from the discharge hole 56b, and the water level of the cleaning water in the water reservoir 156 drops. When the cleaning water in the water reservoir 156 runs out or decreases, the water reservoir 156 and the transmission part 248 are raised again by the spring 249 and return to the standby position. Therefore, the operating part 258 also retreats in a direction away from the rod 232 in response to the raising of the transmission part 248. As the cleaning water in the cylinder 14a of the drain valve hydraulic drive part 14 flows out, the piston 14b is further lowered.

[0175] Since the float switch 42 is still in the off state, the open state of the second control valve 22 is maintained, and the water supply to the water storage tank 10 continues. The cleaning water supplied through the water supply passage 50 reaches the water supply passage branch part 50a. A part of the cleaning water branched at the water supply passage branch part 50a flows into the overflow pipe 10b, and the rest is stored in the water storage tank 10. The cleaning water flowing into the overflow pipe 10b flows into the toilet body 2 and is used for refilling the bowl part 2a. With the drain valve 12 closed, the cleaning water flows into the water storage tank 10, causing the water level in the water storage tank 10 to rise. Thereafter, when the water level in the water storage tank 10 rises to the predetermined full water level WL, the float switch 42 turns on. The operations of the cleaning water tank device 104 and the like until returning to the subsequent standby state are the same as those in the large cleaning mode shown in FIG. 22, so the description is omitted.

[0176] As described above, the third embodiment has been illustrated. However, all or part of the structures of the first embodiment, the second embodiment, the third embodiment, and each modification can be arbitrarily recombined or extracted and changed.

[0177] According to the washing water tank device 204 according to the third embodiment of the present invention described above, the drain valve hydraulic pressure driving unit 214 is disposed separately from the drain valve casing 213 outside the drain valve casing 213 that disposes the drain valve 12 inward, and the clutch mechanism 230 is disposed at a position on the side of the drain valve hydraulic pressure driving unit among the positions from the drain valve hydraulic pressure driving unit 214 to the drain valve casing 213. Thereby, the clutch mechanism 230 can be disposed at a position on the side of the drain valve hydraulic pressure driving unit among the positions between the drain valve casing 213 and the drain valve hydraulic pressure driving unit 214, and the degree of freedom in setting the position for disconnecting the clutch mechanism 230 and the degree of freedom in the arrangement position of the clutch mechanism 230 can be improved.

Explanation of Signs

[0178] 1 Toilet flushing device 2 Toilet bowl main body 4 Washing water tank device 6 Remote control device 10 Water storage tank 10a Drain port 12 Drain valve 14 Drain valve hydraulic pressure driving unit 18 Electromagnetic valve 24 Electromagnetic valve 26 Float 26a Float 30 Clutch mechanism 46 Holding mechanism 48 Transmission part 54 Discharge part 56 Water storage part 56b Discharge hole 104 Washing water tank device 130 Clutch mechanism 148 Transmission part 156 Water storage part

Claims

1. A washing water tank device for supplying washing water to a flush toilet, comprising: a water storage tank that stores the washing water to be supplied to the flush toilet and has a drain port for discharging the stored washing water to the flush toilet; a drain valve that opens and closes the drain port to supply and stop the supply of washing water to the flush toilet; a drain valve hydraulic pressure driving unit that drives the drain valve using the supply water pressure of the supplied tap water; a clutch mechanism that connects the drain valve and the drain valve hydraulic pressure driving unit to pull up the drain valve by the driving force of the drain valve hydraulic pressure driving unit and is disconnected at a predetermined timing to lower the drain valve; washing water amount selection means for selecting a first washing water amount for washing the flush toilet and a second washing water amount smaller than the first washing water amount; a holding mechanism that is a timing control mechanism for stopping the descent of the drain valve while engaged with the drain valve and controlling the timing at which the drain port is closed; a valve control unit connected to the holding mechanism, and having: the holding mechanism includes an engaging member for restricting the descent of the drain valve by engaging with the pulled-up drain valve; the valve control unit is configured to control to release the engagement of the holding mechanism at a timing corresponding to the washing water amount selected by the washing water amount selection means, when the first washing water amount is selected by the washing water amount selection means, the holding mechanism is operated so that the engagement between the engaging member and the drain valve is released after the elapse of a first time, and the drain valve is lowered after the elapse of the first time; when the second washing water amount is selected by the washing water amount selection means, the valve control unit operates the holding mechanism so that the engagement between the engaging member and the drain valve is released after the elapse of a second time shorter than the first time, and the drain valve is lowered after the elapse of the second time. A washing water tank device characterized by the above.

2. A washing water tank device for supplying washing water to a flush toilet, comprising: a water storage tank that stores the washing water to be supplied to the flush toilet and has a drain port for discharging the stored washing water to the flush toilet; a drain valve that opens and closes the drain port to supply and stop the supply of washing water to the flush toilet; a drain valve hydraulic pressure driving unit that drives the drain valve using the supply water pressure of the supplied tap water; A clutch mechanism that connects the upper end of the valve shaft provided on the drain valve and the lower end of the rod provided on the drain valve hydraulic drive unit by engaging a valve shaft side engaging portion and a rod side engaging portion; A washing water amount selection means capable of selecting a first washing water amount for washing the toilet and a second washing water amount smaller than the first washing water amount; It has a valve control unit formed so as to be able to disconnect the clutch mechanism at a predetermined timing. The clutch mechanism lowers the drain valve by disconnecting the engagement of the valve shaft side engaging portion and the rod member side engaging portion after the drain valve is pulled up by the driving force of the drain valve hydraulic drive unit. The valve control unit has an operating portion, and when the first washing water amount is selected by the washing water amount selection means, the operating portion is moved after the elapse of the first time to operate so as to disconnect the clutch mechanism, and the drain valve is lowered after the elapse of the first time. The valve control unit is operated so as to move the operating portion after the elapse of a second time shorter than the first time to disconnect the clutch mechanism when the second washing water amount is selected by the washing water amount selection means, and lower the drain valve after the elapse of the second time. A washing water tank device characterized by this.

3. Furthermore, a control valve provided in a flow path for supplying washing water to the valve control unit and controlling the supply of washing water to the valve control unit; A control unit for controlling the control valve is provided. The valve control unit is formed to be operated by the supplied washing water. The washing water tank device according to claim 1 or 2.

4. The washing water tank device according to claim 3, wherein after the drain valve hydraulic drive unit raises the drain valve, the supply of washing water from the control valve to the valve control unit is started.

5. The control valve is provided so as to also control the supply of washing water to the drain valve hydraulic drive unit. The washing water tank device according to claim 3 or 4.

6. The control valve supplies washing water to the valve control unit via the drain valve hydraulic drive unit. The washing water tank device according to any one of claims 3 to 5.

7. The valve control unit A water storage portion for storing washing water, and a discharge hole for discharging the stored washing water is formed at the lower part of the water storage portion. A discharge portion for discharging washing water to the water storage portion; It includes a float provided in the water storage portion and moving up and down according to the water level in the water storage portion. The engaging member of the holding mechanism engages with the drain valve according to the position of the float. When washing water is stored in the water storage portion and the float is rising, the holding mechanism arranges the engaging member at a position where it can engage with the drain valve. When the float descends, the holding mechanism moves the engaging member to a position where the engagement with the drain valve is released. The washing water tank device according to claim 1.

8. The washing water tank device according to claim 7, wherein after the clutch mechanism is disengaged, the supply of washing water from the control valve to the valve control unit is started.

9. The drain valve hydraulic drive unit is arranged spaced apart from the drain valve casing outside the drain valve casing that arranges the drain valve inward, and the clutch mechanism is arranged at a position on the drain valve hydraulic drive unit side among the positions from the drain valve hydraulic drive unit to the drain valve casing. The washing water tank device according to any one of claims 1 to 8.

10. A flush toilet device, The washing water tank device according to any one of claims 1 to 9, The flush toilet washed with the washing water supplied from this washing water tank device, A flush toilet device characterized by having the above.

Images