A flushing water tank device, and a flush toilet device equipped therewith.

Abstract

The present invention aims to provide a flushing water tank device that can reliably switch between large and small flushes with a simple structure, and a flush toilet device equipped therewith. [Solution] The present invention relates to a flushing water tank device comprising: a storage tank for storing flushing water; a water supply valve for supplying flushing water into the storage tank; a drain valve for supplying the flushing water in the storage tank to the toilet bowl body; a first float configured to be connectable to or disconnectable from the drain valve and for applying buoyancy to the drain valve during a full flush; a second float configured to be connectable to or disconnectable from the drain valve and for applying buoyancy to the drain valve during a small flush; and a drive mechanism for raising the drain valve to a predetermined height based on a flush start operation, wherein the device is equipped with a regulating mechanism that restricts the rise of the first float or the second float during either a full flush or a small flush, and releases the restriction on the rise of the first float or the second float during the other of the full flush or a small flush.

Description

Technical Field

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

Background Art

[0002] Conventionally, as described in Patent Document 1, there is known a washing water tank device including a drain valve for supplying washing water in a storage tank to a toilet body, and a hydraulic drive mechanism for driving the drain valve device by the water supply pressure of the washing water supplied from a water supply. In this washing water tank device, when washing water is supplied to the hydraulic drive mechanism, the drain valve is lifted by the water supply pressure of the washing water to supply the washing water to the toilet body. Since the lifting of the drain valve by this hydraulic drive mechanism utilizes the water supply pressure of the washing water, the drain valve is lifted to the same height position regardless of whether it is a large wash or a small wash.

[0003] Furthermore, the cleaning water tank device described in Patent Document 1 switches the amount of cleaning water used in a large or small wash by changing the timing at which the drain valve begins to descend under its own weight, since the drain valve is raised to the same height regardless of whether it is a large or small wash. Specifically, the cleaning water tank device described in Patent Document 1 includes a large wash float located at a relatively low position in the tank, a small wash float located at a relatively high position in the tank, and a control spray unit that sprays cleaning water supplied from the water supply towards the large wash float. The large wash float and the small wash float are attached to the drain valve so as to be connectable or disconnectable. In the case of a large wash, the large wash float is connected to the drain valve, and the drain valve begins to descend under its own weight at a relatively low water level. On the other hand, in the case of a small wash, cleaning water is sprayed from the control spray unit towards the large wash float, the connection between the large wash float and the drain valve is released, the small wash float is connected to the drain valve, and the drain valve begins to descend under its own weight at a relatively high water level. Thus, the cleaning water tank device described in Patent Document 1 changes the timing at which the drain valve begins to descend due to its own weight by switching the connection or disconnection between the drain valve and each float by spraying cleaning water from a control spraying unit. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2021-134619 [Overview of the project] [Problems that the invention aims to solve]

[0005] However, the cleaning water tank device described in Patent Document 1 has a problem in that the switching between connecting and disconnecting the drain valve and each float is done by spraying cleaning water from the control spray unit, so if the water supply pressure of the cleaning water sprayed from the control spray unit fluctuates, the switching becomes unstable. In addition, it is necessary to create a new water supply path to supply cleaning water to the control spray unit, which complicates the structure of the cleaning water tank device.

[0006] Therefore, the present invention aims to provide a flushing water tank device that can reliably switch between large and small flushes with a simple structure, and a flush toilet device equipped therewith. [Means for solving the problem]

[0007] To solve the above-mentioned problems, the present invention provides a flushing water tank device that is attached to a toilet bowl body for supplying flushing water, comprising: a storage tank for storing flushing water to be supplied to the toilet bowl body; a water supply valve for supplying flushing water into the storage tank; a drain valve for opening and closing a drain port provided in the storage tank to supply the flushing water in the storage tank to the toilet bowl body; a first float configured to be connectable to or disconnectable from the drain valve and to apply buoyancy to the drain valve during a full flush; a second float configured to be connectable to or disconnectable from the drain valve and to apply buoyancy to the drain valve during a small flush; and a drive mechanism for raising the drain valve to a predetermined height based on a flush start operation, wherein the device is equipped with a regulating mechanism that restricts the rise of the first float or the second float during either a full flush or a small flush, and releases the restriction on the rise of the first float or the second float during the other of the full flush or a small flush.

[0008] According to the present invention configured in this way, since it is equipped with a regulating mechanism that restricts the rise of the first float or the second float during either a large or small wash, and releases the restriction on the rise of the first float or the second float during the other wash, it is possible to stably switch between large and small washes with a simple structure.

[0009] In the present invention, preferably, the regulating mechanism is configured to restrict the rise of the first float during a small wash and to release the restriction on the rise of the first float during a large wash.

[0010] According to the present invention configured in this way, the regulating mechanism is configured to restrict the rise of the first float during small-scale flushing and to release the restriction on the rise of the first float during large-scale flushing, so that large-scale and small-scale flushing can be stably switched with a simple structure.

[0011] Furthermore, in the present invention, the regulating mechanism comprises a rotating shaft and a retaining plate that rotates around the rotating shaft, and is configured such that the upward movement of the first float is restricted or released by the rotation of the retaining plate.

[0012] According to the present invention configured in this way, the regulating mechanism comprises a rotating shaft and a retaining plate that rotates around this rotating shaft, and the rotation of the retaining plate restricts or releases the rising of the first float, so that large and small washes can be stably switched with a simple structure.

[0013] In the present invention, preferably, the first float is connected to a shaft member that moves in the vertical direction, the shaft member comprising a shaft body portion extending in the vertical direction and a projection portion extending perpendicular to the axial direction of the shaft body portion, and the upward movement of the first float is restricted when the retaining plate contacts the projection portion of the shaft member.

[0014] According to the present invention configured in this way, the first float is connected to a shaft member that moves in the vertical direction, and the shaft member comprises a shaft body portion extending in the vertical direction and a projection portion extending perpendicular to the axial direction of the shaft body portion, and the upward movement of the first float is restricted when the retaining plate contacts the projection portion of the shaft member, so that large and small washes can be stably switched with a simple structure.

[0015] Furthermore, in the present invention, preferably, the retaining plate is positioned so as not to come into contact with the shaft body of the shaft member when in standby mode.

[0016] According to the present invention configured in this way, the retaining plate is positioned so as not to come into contact with the shaft body of the shaft member in the standby state, thereby enabling stable vertical movement of the shaft member.

[0017] In the present invention, preferably, the drive mechanism is a hydraulic drive mechanism that uses the water pressure of the washing water from the water source to lift the drain valve.

[0018] According to the present invention configured in this manner, the drive mechanism is a hydraulic drive mechanism that uses the water pressure of the washing water from the water source to lift the drain valve, so the drain valve can be lifted with a simple structure.

[0019] Furthermore, the present invention preferably includes a clutch mechanism that raises the drain valve based on the cleaning start operation and lowers the drain valve at a predetermined timing.

[0020] According to the present invention configured in this way, since it has a clutch mechanism that raises the drain valve based on the cleaning start operation and lowers the drain valve at a predetermined timing, the drain valve can be lowered at a predetermined timing.

[0021] In the present invention, preferably, is a flush toilet device equipped with the above-mentioned flushing water tank device.

[0022] According to the present invention configured in this manner, it is possible to provide a flush toilet device equipped with a flushing water tank device that can reliably switch between large and small flushes with a simple structure. [Effects of the Invention]

[0023] According to the flushing water tank device and the flush toilet device equipped therewith, a simple structure allows for stable switching between full and partial flushing.

Brief Description of the Drawings

[0024] [Figure 1] It is a block diagram showing the overall configuration of the flushing toilet device according to an embodiment of the present invention. [Figure 2] It is a top view showing the schematic configuration of the flushing toilet device according to an embodiment of the present invention. [Figure 3] It is a schematic perspective view of the cleaning water tank device provided in the flushing toilet device according to an embodiment of the present invention. [Figure 4] It is a schematic cross-sectional view of the first drain valve of the cleaning water tank device according to an embodiment of the present invention. [Figure 5] It is a schematic cross-sectional view of the second drain valve and the hydraulic drive mechanism of the cleaning water tank device according to an embodiment of the present invention. [Figure 6] It is a schematic cross-sectional view of the hydraulic drive mechanism of the cleaning water tank device according to an embodiment of the present invention. [Figure 7] It is a schematic perspective view of the regulating mechanism of the cleaning water tank device according to an embodiment of the present invention as seen from the rear. [Figure 8] It is a schematic perspective cross-sectional view of the regulating mechanism of the cleaning water tank device according to an embodiment of the present invention as seen from the front. [Figure 9] It is a schematic diagram for explaining the operation of the operation unit and the regulating mechanism in the small cleaning of the cleaning water tank device according to an embodiment of the present invention. [Figure 10] It is a schematic diagram for explaining the operation of the operation unit and the regulating mechanism in the large cleaning of the cleaning water tank device according to an embodiment of the present invention. [Figure 11] It is a schematic diagram for explaining the operation of the regulating mechanism in the large cleaning of the cleaning water tank device according to an embodiment of the present invention. [Figure 12] It is a schematic diagram for explaining the action of the regulating mechanism in the small cleaning of the cleaning water tank device according to an embodiment of the present invention. [Figure 13] It is a schematic diagram for explaining the action of the regulating mechanism in the large cleaning of the cleaning water tank device according to an embodiment of the present invention. [Modes for carrying out the invention]

[0025] Next, with reference to the attached drawings, a flushing water tank device according to an embodiment of the present invention and a flush toilet device equipped therewith will be described. Figure 1 is a block diagram showing the overall configuration of a flush toilet device according to an embodiment of the present invention, Figure 2 is a top view showing the schematic configuration of a flush toilet device according to an embodiment of the present invention, and Figure 3 is a schematic perspective view of a flush water tank device provided in a flush toilet device according to an embodiment of the present invention. In this specification, when viewing a flush toilet unit from the front, the front side is referred to as "front," the back side as "rear," the left side as "left," and the right side as "right."

[0026] As shown in Figures 1 and 2, the flush toilet device 1 according to an embodiment of the present invention comprises a ceramic toilet bowl body 2 and a flush water tank device 4 located at the rear of the toilet bowl body 2. The flush toilet device 1 of this embodiment is configured so that the toilet bowl is flushed by operating a lever handle 4a provided on the flush water tank device 4.

[0027] The toilet bowl body 2 comprises a bowl portion 2a and a drain trap pipe 2b extending from the lower part of the bowl portion 2a. A rim outlet 2c is provided on the upper edge of the bowl portion 2a, and a jet outlet 2d is provided on the lower part of the bowl portion 2a. When the toilet is flushed, flushing water is discharged from these rim outlets 2c and jet outlets 2d at predetermined timings, cleaning the waste receiving surface of the bowl portion 2a, and the waste and flushing water in the bowl portion 2a are discharged into the drain trap pipe 2b. The waste and flushing water discharged into the drain trap pipe 2b are then discharged into the sewer pipe (not shown) through a drain socket (not shown).

[0028] The flushing water tank device 4 is supplied with flushing water from a water source 6, such as a water supply, and the supplied flushing water is stored inside the flushing water tank device 4. The flushing water tank device 4 also has a first drain valve 8 and a second drain valve 10 built into it. In this embodiment, by opening the first drain valve 8, the flushing water is discharged from the rim outlet 2c through the rim water channel 2e formed inside the toilet bowl body 2. By opening the second drain valve 10, the flushing water is discharged from the jet outlet 2d through the jet water channel 2f formed inside the toilet bowl body 2.

[0029] Next, the internal structure of the cleaning water tank device will be described with reference to Figures 1 to 3. As shown in Figures 1 to 3, the flushing water tank device 4 comprises an outer tank 12, an inner tank 14 located inside the outer tank 12, a first drain valve 8 located inside the outer tank 12, a second drain valve 10 located inside the inner tank 14, a water supply valve 16, a water pressure drive mechanism 18, and an operating unit 20. In the standby state (before toilet flushing is started), flushing water is stored in the flushing water tank device 4 up to the shut-off water level WL0.

[0030] The outer tank 12 and the inner tank 14 are containers configured to store flushing water to be supplied to the toilet bowl body 2. In this embodiment, the outer tank 12 is made of ceramic, and the inner tank 14, which is located inside the outer tank 12, is made of resin.

[0031] Furthermore, as shown in Figure 1, a first drain port 12a and a second drain port 12b are provided on the bottom surface of the outer tank 12, and in this embodiment, these drain ports are circular in shape. Here, the flushing water stored in the outer tank 12 (and outside the inner tank 14) flows into the rim water channel 2e of the toilet bowl body 2 through the first drain port 12a, and the flushing water stored in the inner tank 14 flows into the jet water channel 2f of the toilet bowl body 2 through the second drain port 12b.

[0032] The inner tank 14 is positioned on the bottom surface of the outer tank 12, and the lower part of the inner tank 14 is submerged in the flushing water stored in the outer tank 12. A circular drain port 14a is formed on the bottom surface of the inner tank 14. This drain port 14a of the inner tank 14 is arranged concentrically with the second drain port 12b provided in the outer tank 12. That is, in this embodiment, the center of the circular second drain port 12b and the circular drain port 14a coincide when viewed from above. Therefore, the flushing water in the inner tank 14 flows into the jet water channel 2f of the toilet bowl body 2 through the drain port 14a of the inner tank 14 and the second drain port 12b of the outer tank 12.

[0033] Furthermore, as shown in Figure 2, the outer tank 12 of the flushing water tank device 4 is configured in a roughly rectangular shape when viewed from above, with the left-right direction being longer and the front-back direction being shorter. The inner tank 14, which is located inside the outer tank 12, is also configured in a way that the left-right direction is longer and the front-back direction is shorter when viewed from above, and is also irregularly shaped to avoid the first drain valve 8 and the water supply valve 16.

[0034] In this embodiment, a water supply valve 16 is located at the front left end (lower left corner in Figure 2) of the outer tank 12, and a first drain valve 8 is located at the front right end (lower right corner in Figure 2). The inner tank 14 is formed to avoid these water supply valve 16 and first drain valve 8 when viewed from above.

[0035] Furthermore, in this embodiment, the upper end of the inner tank 14 is configured to be at substantially the same height around its entire circumference. Therefore, when the cleaning water supplied to the inner tank 14 overflows and flows into the outer tank 12, the cleaning water flows into the outer tank over the entire circumference of the upper edge of the inner tank 14.

[0036] As shown in Figure 1, stepped portions 14b are formed on both the left and right sides of the inner tank 14, and the lower part is configured to be narrower. That is, the inner tank 14 is formed in a roughly T-shape when viewed from the front, and at least the lower part of the inner tank 14 is submerged in the cleaning water stored in the outer tank 12. In other words, the inner tank 14 is configured so that its cross-sectional area changes in the height direction, and the horizontal cross-sectional area at the top of the inner tank 14 is larger than the horizontal cross-sectional area at the bottom. As a result, a large amount of cleaning water with high potential energy is stored at the top of the inner tank 14, which increases the hydrostatic pressure of the cleaning water discharged from the inner tank 14 and increases the instantaneous flow rate of the discharged cleaning water.

[0037] Next, the first drain valve 8 is a valve body positioned to open and close the first drain port 12a provided in the outer tank 12. When the first drain valve 8 is pulled upward, the first drain port 12a is opened. As a result, the flushing water in the outer tank 12 is discharged into the rim water channel 2e (Figure 1) of the toilet bowl body 2 and discharged from the rim outlet 2c. Therefore, the first drain valve 8 switches the supply of flushing water stored in the outer tank 12 to the toilet bowl body 2 on and off.

[0038] In this embodiment, the user rotates a lever handle 4a provided on the flushing water tank device 4, which pulls a wire 20a (Figure 3) connected to the first drain valve 8, thereby raising the first drain valve 8. As a modification, the present invention can also be configured so that the first drain valve 8 is raised and the toilet is flushed based on a control signal from a remote control device (not shown) or a detection signal from a motion sensor (not shown).

[0039] Next, the second drain valve 10 is a valve body positioned to open and close the drain port 14a provided in the inner tank 14. By pulling the second drain valve 10 upward, the second drain valve 10 separates from the seat surface of the drain port 14a, and the drain port 14a opens. As a result, the flushing water in the inner tank 14 is discharged from the drain port 14a, flows through the drain port 14a into the jet water channel 2f (Figure 1) of the toilet bowl body 2, and is discharged from the jet outlet 2d. Therefore, the second drain valve 10 switches the supply of flushing water stored in the inner tank 14 to the toilet bowl body 2 on and off.

[0040] Furthermore, in this embodiment, the second drain valve 10 is configured to be pulled up from the drain port 14a by a hydraulic drive mechanism 18. That is, the second drain valve 10 is a valve body 10b with a valve stem 10c extending upward, and the valve stem 10c is pulled up by the hydraulic drive mechanism 18. When the second drain valve 10 is pulled up to a predetermined height, it is detached from the hydraulic drive mechanism 18 and slowly descends to close the drain port 14a. The configuration of the hydraulic drive mechanism 18 will be described later, but the present invention can also be applied to a washing water tank device that is not equipped with a hydraulic drive mechanism 18.

[0041] Furthermore, the water supply valve 16 is configured to switch the supply and stop of cleaning water supplied from the water source 6 to the hydraulic drive mechanism 18, the outer tank 12, and the inner tank 14. The water supply valve 16 comprises a main body 16a, an inlet pipe 16b connecting the main body 16a to the water source 6, an outlet pipe 16c connecting the main body 16a to the hydraulic drive mechanism 18, a valve body (not shown) provided inside the main body 16a for switching the supply and stop of cleaning water from the inlet pipe 16b to the outlet pipe 16c, and a float 16d that opens and closes the valve body in conjunction with the water level in the cleaning water tank device 4.

[0042] As shown in Figures 2 and 3, the operating unit 20 includes a wire 20a connected to the first drain valve 8, an operating rotation shaft 20b that transmits the rotation of the lever handle 4a, a gear unit 20c that winds up the wire 20a in accordance with the rotation of the operating rotation shaft 20b, a ball chain 20d connected to a regulating mechanism 22 (described later), and a ball chain mounting member 20e for attaching the ball chain 20d. The operating unit 20 is configured such that when the lever handle 4a is rotated to one side, a small flush is performed, and when the lever handle 4a is rotated to the other side, a large flush is performed.

[0043] The operating rotation shaft 20b extends horizontally from side to side within the outer tank 12 (and above the inner tank 14). The left end of the operating rotation shaft 20b passes through the outer tank 12 and is connected to the lever handle 4a. The operating rotation shaft 20b rotates in conjunction with the rotation of the lever handle 4a. The operating rotation shaft 20b is provided with a gear unit 20c and a ball chain mounting member 20e.

[0044] The gear unit 20c is configured to wind up the wire 20a in accordance with the rotation of the operating rotation shaft 20b. Inside the gear unit 20c are multiple gears (not shown), and the gear ratio of these multiple gears amplifies the amount of rotation of the operating rotation shaft 20b, thereby winding up the wire 20a. The wire 20a is slidably mounted inside the flexible tube 20f, with one end connected to the gear unit 20c and the other end connected to the first drain valve 8. When the wire 20a is wound up by the gear unit 20c, it pulls up the first drain valve 8.

[0045] The ball chain mounting member 20e is configured to rotate together with the operating rotation shaft 20b to pull up the ball chain 20d. The ball chain mounting member 20e comprises a cylindrical tube 20g extending in the axial direction of the operating rotation shaft 20b, a ball chain mounting portion 20h to which the ball chain 20d is attached, and a guide portion 20i that guides the movement of the ball chain 20d. The ball chain mounting portion 20h extends perpendicular to the axial direction of the operating rotation shaft 20b and in the forward direction. The ball chain mounting member 20e is integrally fixed to the operating rotation shaft 20b and rotates together with the operating rotation shaft 20b. As a result, when the lever handle 4a is rotated, the operating rotation shaft 20b and the ball chain mounting member 20e rotate in conjunction, pulling up the ball chain 20d. One end of the ball chain 20d is connected to the ball chain mounting portion 20h, and the other end is connected to the regulating mechanism 22. When the ball chain 20d is pulled up by the rotation of the operating rotation shaft 20b and the ball chain mounting member 20e, it is designed to pull up the regulating mechanism 22.

[0046] Next, the configuration of the first drain valve 8 will be explained with reference to Figure 4. Figure 4 is a schematic cross-sectional view of the first drain valve of a washing water tank device according to an embodiment of the present invention. As shown in Figure 4, the first drain valve 8 comprises a valve seat portion 8a provided at the first drain port 12a, a valve body 8b that opens and closes the valve seat portion 8a, and a valve shaft 8c extending upward from the valve body 8b. The first drain valve 8 is designed so that the vertical movement of the valve shaft 8c is guided by a guide member 8d provided on the bottom surface of the outer tank 12. A wire 20a is connected to the upper part of the valve shaft 8c, and when the user rotates the lever handle 4a, the valve body 8b and valve shaft 8c are pulled up by the wire 20a.

[0047] The first drain valve 8 is equipped with a float 8e that provides buoyancy to the first drain valve 8. The float 8e is a hollow cylindrical member and is configured to receive buoyancy from the cleaning water stored in the outer tank 12. A through hole 8f is formed in the center of the float 8e through which the valve stem 8c of the first drain valve 8 passes. The float 8e is fixed so as to be movable vertically relative to the valve stem 8c of the first drain valve 8, and the height position of the float 8e can be adjusted. When the water level in the outer tank 12 drops to the position of the float 8e, the first drain valve 8 descends in accordance with the drop in the water level in the outer tank 12.

[0048] Furthermore, the first drain valve 8 is provided with a water weight member 8g above the float 8e. The water weight member 8g is a member that applies a load to the first drain valve 8 to close it if the first drain valve 8 is opened while flushing water is being supplied to the outer tank 12. The water weight member 8g comprises a storage section 8h for storing flushing water, a drain hole 8i provided on the bottom surface of the storage section 8h, and a mounting section 8j attached to the valve stem 8c of the first drain valve 8. While flushing water is being supplied from the outer tank 12 to the toilet bowl body 2, the water weight member 8g does not apply a load to the first drain valve 8 as a water weight, as the flushing water in the storage section 8h is discharged from the drain hole 8i as the flushing water in the outer tank 12 decreases. On the other hand, while cleaning water is being supplied to the outer tank 12, a portion of the cleaning water flowing from the inner tank 14 into the outer tank 12 flows into the storage section 8h, and the cleaning water is stored in the storage section 8h, thus adding a load to the first drain valve 8 as a water weight. In other words, because the cleaning water stored in the storage section 8h adds a load to the first drain valve 8, the first drain valve 8 can be closed even if it is opened while cleaning water is being supplied to the outer tank 12.

[0049] Next, the configuration of the second drain valve 10 will be described with reference to Figure 5. Figure 5 is a schematic cross-sectional view of the second drain valve and hydraulic drive mechanism of a washing water tank device according to an embodiment of the present invention. The second drain valve 10 comprises a valve seat portion 10a provided at the drain port 14a, a valve body 10b that opens and closes the valve seat portion 10a, and a valve shaft 10c extending upward from the valve body 10b. The second drain valve 10 is designed so that the vertical movement of the valve shaft 10c is guided by a guide member 10d provided on the bottom surface of the inner tank 14. The valve shaft 10c has a first projection 10e and a second projection 10f formed to be engageable with the first float 26 and the second float 28, respectively. A clutch mechanism 24 is provided on the upper part of the valve shaft 10c, and the valve shaft 10c is connected to the rod 18c of the hydraulic drive mechanism 18 via this clutch mechanism 24. The clutch mechanism 24 connects the second drain valve 10 to the hydraulic drive mechanism 18, and the second drain valve 10 is lifted by the driving force of the hydraulic drive mechanism 18. Furthermore, when the second drain valve 10 is raised to a predetermined height, the clutch mechanism 24 is disengaged, and the second drain valve 10 descends under its own weight.

[0050] The second drain valve 10 is provided with a first float 26 (float for large-scale flushing) that generates buoyancy for the second drain valve 10 during large-scale flushing, and a second float 28 (float for small-scale flushing) that generates buoyancy for the second drain valve 10 during small-scale flushing. The first and second floats 26 and 28 are hollow rectangular parallelepiped members and are configured to receive buoyancy from the flushing water stored in the flushing water tank device 4. The second drain valve 10 is held in place by the first and second floats 26 and 28 for a predetermined time, after which it begins to descend by its own weight. The first and second floats 26 and 28 are attached to first and second shaft members 30 and 32 that extend in the vertical direction, respectively. The first shaft member 30 and the second shaft member 32 are slidably fixed to the upper part 33a and lower part 33b of the housing 33 that forms the outer shell. The first and second floats 26 and 28 are fixed to the first and second shaft members 30 and 32 so as to be movable in the vertical direction, and the height positions of the first and second floats 26 and 28 can be adjusted.

[0051] The first shaft member 30 and the second shaft member 32 are provided with a first cam member 34 and a second cam member 36, respectively. The first and second cam members 34 and 36 are members that connect to the first and second shaft members 30 and 32, and connect or disconnect the first and second floats 26 and 28 and the second drain valve 10. The first and second cam members 34 and 36 each include first and second support shafts 34a and 36a that extend horizontally within the housing 33, first and second mounting portions 34b and 36b that extend to one side from the first and second support shafts 34a and 36a, and first and second engaging portions 34c and 36c that extend to the other side from the first and second support shafts 34a and 36a. The first and second support shafts 34a and 36a are rotatably fixed to the side portion 33c of the housing 33. The first and second mounting portions 34b and 36b are connected to the first and second shaft members 30 and 32.

[0052] The first and second engaging portions 34c and 36c rotate in conjunction with the first and second floats 26 and 28 around the first and second support shafts 34a and 36a, and are configured to engage with or disengage from the first and second projections 10e and 10f provided on the valve stem 10c. When the first and second floats 26 and 28 are in their highest position, the first and second engaging portions 34c and 36c rotate around the first and second support shafts 34a and 36a to engage with the first and second projections 10e and 10f, and the first and second floats 26 and 28 are connected to the second drain valve 10. Furthermore, when the first and second floats 26 and 28 are in a position lower than their highest position, the first and second engaging portions 34c and 36c rotate in the opposite direction around the first and second support shafts 34a and 36a, so as not to engage with the first and second projections 10e and 10f, and the connection between the first and second floats 26 and 28 and the second drain valve 10 is released.

[0053] Next, the configuration of the hydraulic drive mechanism 18 will be described with reference to Figure 6. Figure 6 is a schematic cross-sectional view of the hydraulic drive mechanism of a cleaning water tank device according to an embodiment of the present invention. In Figure 6, the flow of cleaning water is illustrated by arrows. The hydraulic drive mechanism 18 is configured to drive the second drain valve 10 using the water supply pressure of the cleaning water supplied from the water supply to the cleaning water tank device 4. Specifically, the hydraulic drive mechanism 18 includes a cylinder 18a into which cleaning water supplied from the water supply valve 16 flows, a piston 18b slidably disposed within the cylinder 18a, and a rod 18c protruding from the lower end of the cylinder 18a to drive the second drain valve 10. Furthermore, a spring 18d is placed inside the cylinder 18a to bias the piston 18b downward, and a packing 18e is attached to the piston 18b to ensure watertightness between the inner wall surface of the cylinder 18a and the piston 18b. In addition, a clutch mechanism 24 is provided at the lower end of the rod 18c, and this clutch mechanism 24 is configured to connect or disconnect the rod 18c and the valve stem 10c of the second drain valve 10.

[0054] The cylinder 18a is a cylindrical component with its axis oriented vertically, and a piston 18b is slidably housed inside. An outlet pipe 16c extending from a water supply valve 16 is connected to the lower end of the cylinder 18a, allowing cleaning water flowing out of the water supply valve 16 to enter the cylinder 18a. As a result, the piston 18b inside the cylinder 18a is pushed up against the biasing force of the spring 18d by the cleaning water flowing into the cylinder 18a.

[0055] On the other hand, an outlet hole 18f is provided at the upper end of the cylinder 18a. Therefore, when cleaning water flows into the cylinder 18a from the outlet pipe 16c connected to the lower end of the cylinder 18a, the piston 18b is pushed upward from the bottom of the cylinder 18a. When the piston 18b is pushed up to its uppermost position, the cleaning water from the outlet pipe 16c flows into the cylinder 18a through the communication hole 18h formed in the rod 18c. The cleaning water that has flowed into the cylinder 18a flows out from the outlet hole 18f formed at the upper end of the cylinder 18a, and the cleaning water that has flowed out from the outlet hole 18f falls along the outer surface of the cylinder 18a and flows into the inner tank 14.

[0056] The rod 18c is a rod-shaped member connected to the lower surface of the piston 18b, and extends downward from inside the cylinder 18a through a through hole 18g formed in the bottom surface of the cylinder 18a. The valve stem 10c of the second drain valve 10 is connected to the lower end of the rod 18c via a clutch mechanism 24, and the rod 18c connects the piston 18b and the second drain valve 10. Therefore, when water flows into the cylinder 18a and pushes the piston 18b upward, the rod 18c connected to the piston 18b lifts the second drain valve 10 upward, and the second drain valve 10 opens.

[0057] Furthermore, the clutch mechanism 24 detachably connects the rod 18c and the second drain valve 10. When the second drain valve 10 is lifted a predetermined distance together with the rod 18c, the clutch mechanism 24 is configured to disconnect the valve stem 10c of the second drain valve 10 from the rod 18c. When the clutch mechanism 24 is disconnected, the second drain valve 10 is no longer linked to the movement of the piston 18b and the rod 18c, and the second drain valve 10 descends by its own weight.

[0058] Next, the configuration of the regulatory mechanism 22 will be described with reference to Figures 7 and 8. Figure 7 is a schematic perspective view of the regulating mechanism of the washing water tank device according to an embodiment of the present invention, viewed from the rear, and Figure 8 is a schematic perspective cross-sectional view of the regulating mechanism of the washing water tank device according to an embodiment of the present invention, viewed from the front.

[0059] As shown in Figures 7 and 8, the regulating mechanism 22 is configured to restrict the rise of the first float 26 during light flushing and to release the restriction on the rise of the first float 26 during heavy flushing. The regulating mechanism 22 comprises a rotating shaft 22a, a mounting plate 22b to which a ball chain 20d that is linked to the rotation operation of the lever handle 4a is attached, and a retaining plate 22c that rotates around the rotating shaft 22a to restrict or release the rise of the first float 26. The regulating mechanism 22 is configured in an L-shape by the mounting plate 22b and the retaining plate 22c intersecting at a right angle.

[0060] The rotating shaft 22a is the axis that serves as the center of rotation for the regulating mechanism 22. The rotating shaft 22a extends horizontally in the left-right direction and is parallel to the operating rotating shaft 20b of the operating unit 20. The rotating shaft 22a is fixed to the upper part 33a (the part near the first shaft member 30) of the housing 33 that covers the second drain valve 10. The rotating shaft 22a is located between the mounting plate 22b and the retaining plate 22c.

[0061] The mounting plate 22b is a component to which the ball chain 20d is attached, and is a flat plate with mounting holes 22f for the ball chain 20d formed therein. In the standby state, the mounting plate 22b extends horizontally in the front-rear direction. In a top view, the mounting plate 22b extends perpendicular to the axial direction of the operating rotation axis 20b of the operating unit 20 (see Figure 2). In a top view, the mounting holes 22f formed in the mounting plate 22b are located on the rear side of the central axis of the operating rotation axis 20b (opposite side from the ball chain mounting portion 20h).

[0062] The retaining plate 22c is a member that restricts the movement of the first shaft member 30, and comprises a main body portion 22d which is a flat plate, and a projection portion 22e which bends from the tip of the main body portion 22d and extends toward the first shaft member 30. The retaining plate 22c is configured to be able to move in and out of the housing 33 through an opening 33d formed in the housing 33. The main body portion 22d of the retaining plate 22c is formed to intersect the mounting plate 22b at a right angle. In the standby state, the main body portion 22d of the retaining plate 22c extends vertically and is parallel to the first shaft member 30. The projection portion 22e of the retaining plate 22c is bent at an angle of approximately 30 degrees with respect to a virtual line extending the main body portion 22d.

[0063] As shown in Figure 8, the first shaft member 30 to which the first float 26 is connected is provided with a shaft body portion 30a extending vertically, an upper projection 30b that restricts the rise of the first float 26 during a large wash, and a lower projection 30c that contacts the retaining plate 22c during a small wash to restrict the rise of the first float 26. The upper projection 30b and the lower projection 30c are formed on the upper part of the first shaft member 30. The distance between the upper projection 30b and the lower projection 30c is set to be longer than the length of the protrusion 22e of the retaining plate 22c. The upper projection 30b and the lower projection 30c are formed around the entire circumference of the shaft body portion 30a and extend perpendicularly to the shaft body portion 30a.

[0064] Next, the operation of the operating unit 20 and the regulating mechanism 22 during small-scale flushing will be explained. Figure 9 is a schematic diagram illustrating the operation of the operating unit and regulating mechanism during small-scale cleaning of a cleaning water tank device according to an embodiment of the present invention. First, as shown in column (a) of Figure 9, in the standby state (initial state), the ball chain 20d is loosely connected to the ball chain mounting member 20e and the regulating mechanism 22.

[0065] Next, as shown in column (b) of Figure 9, when the user rotates the lever handle 4a in the direction of small-scale cleaning (counterclockwise), the operating rotation shaft 20b and the ball chain mounting member 20e rotate together counterclockwise. The ball chain 20d becomes even looser, and the regulating mechanism 22 is kept in a standby state without being pulled up. In this way, in the case of small-scale cleaning, the regulating mechanism 22 is kept in a standby state and does not operate.

[0066] Next, the operation of the control unit 20 and the regulating mechanism 22 during a large-scale cleaning will be explained. Figure 10 is a schematic diagram illustrating the operation of the operating unit 20 and the regulating mechanism 22 during a major cleaning of a cleaning water tank device according to an embodiment of the present invention. First, as shown in column (a) of Figure 10, in the standby state (initial state), the ball chain 20d is loosely connected to the ball chain mounting member 20e and the regulating mechanism 22.

[0067] Next, as shown in column (b) of Figure 10, when the user rotates the lever handle 4a in the direction of full flushing (clockwise), the operating rotation shaft 20b and the ball chain attachment member 20e rotate together clockwise. As the ball chain attachment member 20e rotates, the ball chain 20d moves along the guide portion 20i and wraps around the ball chain attachment member 20e. As a result, the ball chain 20d becomes taut, and the regulating mechanism 22 is pulled up.

[0068] Next, as shown in column (c) of Figure 10, when the operating rotation shaft 20b and the ball chain attachment member 20e are rotated further, the ball chain 20d wraps more around the ball chain attachment member 20e, further pulling up the regulating mechanism 22. In this way, during a large-scale cleaning, the regulating mechanism 22 is pulled up by the ball chain 20d and rotates together with the rotation of the operating rotation shaft 20b and the ball chain attachment member 20e.

[0069] Next, the operation of the regulating mechanism 22 during the large-scale cleaning will be described in detail. Figure 11 is a schematic diagram illustrating the operation of the regulating mechanism 22 during a major cleaning of a cleaning water tank device according to an embodiment of the present invention. First, as shown in column (a) of Figure 11, in the standby state (initial state), the regulating mechanism 22 has its mounting plate 22b horizontal and the main body portion 22d of the retaining plate 22c vertical. The protruding portion 22e of the retaining plate 22c is located inside the housing 33, and the lower surface of the protruding portion 22e of the retaining plate 22c is in contact with the upper surface of the lower projection 30c of the first shaft member 30. This restricts the upward movement of the first float 26 connected to the first shaft member 30. Also, in the standby state, a force (F1) acts on the regulating mechanism 22, causing it to rotate counterclockwise around the rotation axis 22a due to its own weight. This ensures stable contact between the protruding portion 22e of the retaining plate 22c and the lower projection 30c of the first shaft member 30.

[0070] Furthermore, in the standby state, the regulating mechanism 22 has the main body portion 22d of the retaining plate 22c in contact with the outer surface 33e of the upper part 33a of the housing 33. This prevents the retaining plate 22c from coming into contact with the shaft body portion 30a of the first shaft member 30.

[0071] Next, as shown in column (b) of Figure 11, when the lever handle 4a is rotated in the direction of full flushing, a clockwise rotational force (F2) acts on the regulating mechanism 22, causing the regulating mechanism 22 to rotate clockwise around the rotation axis 22a. The protrusion 22e of the retaining plate 22c no longer contacts the lower projection 30c of the first shaft member 30, and the restriction on the rising of the first float 26 is released. As a result, the first shaft member 30 moves upward due to the buoyancy of the first float 26.

[0072] Furthermore, as shown in column (c) of Figure 11, when the first shaft member 30 moves upward, the upper projection 30b of the first shaft member 30 comes into contact with the inner surface 33f of the upper part 33a of the housing 33, stopping the upward movement of the first shaft member 30.

[0073] Next, as shown in column (d) of Figure 11, when the rotation of the lever handle 4a is stopped, a counterclockwise rotational force (F1) acts on the regulating mechanism 22 due to its own weight, causing it to rotate counterclockwise around the rotation axis 22a and return to its original state.

[0074] Furthermore, as shown in column (e) of Figure 11, when the first float 26 descends in conjunction with the water level in the washing water tank device 4, the first shaft member 30 moves downward. When the first shaft member 30 moves downward, the lower projection 30c of the first shaft member 30 comes into contact with the protrusion 22e of the retaining plate 22c. Because the upper surface of the protrusion 22e of the retaining plate 22c is inclined downward toward the first shaft member 30, the lower projection 30c of the first shaft member 30 moves downward while in contact with the upper surface of the protrusion 22e of the retaining plate 22c. This allows the lower projection 30c of the first shaft member 30 to rotate the regulating mechanism 22 clockwise.

[0075] Next, as shown in column (f) of Figure 11, when the first shaft member 30 moves further downward, the lower projection 30c of the first shaft member 30 pushes up and passes over the protruding portion 22e of the retaining plate 22c.

[0076] Furthermore, as shown in column (g) of Figure 11, when the first shaft member 30 moves further downward, a counterclockwise rotational force (F1) acts on the regulating mechanism 22 due to its own weight, causing it to rotate counterclockwise around the rotation axis 22a and return to its original state. In this state, the protrusion 22e of the retaining plate 22c is located between the upper projection 30b and the lower projection 30c of the first shaft member 30.

[0077] Next, as shown in column (h) of Figure 11, when the first float 26 rises in conjunction with the water level in the cleaning water tank device 4, the first shaft member 30 moves upward. When the first shaft member 30 moves upward, the upper surface of the lower projection 30c of the first shaft member 30 comes into contact with the lower surface of the projection 22e of the retaining plate 22c, returning to the standby state (Figure 11(a)).

[0078] Next, the operation of the regulating mechanism 22 in small and large washes will be explained with reference to Figures 12 and 13. Figure 12 is a schematic diagram illustrating the operation of the regulating mechanism of the cleaning water tank device according to an embodiment of the present invention during minor cleaning, and Figure 13 is a schematic diagram illustrating the operation of the regulating mechanism of the cleaning water tank device according to an embodiment of the present invention during major cleaning. First, with reference to Figure 12, the function of the regulatory mechanism 22 in small-scale flushing will be explained. In the standby state (see column (a) in Figure 12), flushing water is stored in the inner tank 14 up to the shut-off water level WL0. When the user rotates the lever handle 4a in the direction of a small flush, the first drain valve 8 is pulled up by the wire 20a, and the flushing water stored in the outer tank 12 is discharged from the first drain port 12a. When the water level of the flushing water in the outer tank 12 drops, the float 16d of the water supply valve 16 descends, and the water supply valve 16 opens. When the water supply valve 16 opens, the flushing water that flows in from the inlet pipe 16b is supplied to the hydraulic drive mechanism 18 via the outlet pipe 16c. This pushes up the piston 18b of the hydraulic drive mechanism 18, which in turn pulls up the second drain valve 10 via the rod 18c, and the flushing water in the inner tank 14 is discharged from the drain port 14a to the toilet bowl body 2, causing the water level WL1 to gradually decrease.

[0079] Furthermore, the regulating mechanism 22 is maintained in a standby state. That is, the retaining plate 22c of the regulating mechanism 22 contacts the lower projection 30c of the first shaft member 30, pushing the first float 26 downward. As a result, the regulating mechanism 22 restricts the rise of the first float 26, preventing the first engaging portion 34c of the first cam member 34 from engaging with the first projection 10e provided on the valve stem 10c of the second drain valve 10. In other words, the first cam member 34 is maintained in a disengaged state regardless of the water level in the inner tank 14.

[0080] Next, when the second drain valve 10 is raised to a predetermined position, the clutch mechanism 24 is disengaged (see column (b) in Figure 12). Once the clutch mechanism 24 is disengaged, the second drain valve 10 begins to descend toward the drain port 14a due to its own weight. At this point, immediately after the second drain valve 10 is opened, the water level in the inner tank 14 is high, so the second cam member 36 is maintained in an engaged state. On the other hand, the first cam member 34 is maintained in an unengaged state by the regulating mechanism 22, as described above. Therefore, the second projection 10f of the descending second drain valve 10 engages with the second engaging portion 36c of the second cam member 36, and the second drain valve 10 is held at a predetermined height by the second float 28.

[0081] Next, as the water level WL2 in the inner tank 14 drops further, the second float 28 and the second drain valve 10 descend in accordance with the water level WL2 in the inner tank 14 (see column (c) in Figure 12).

[0082] Next, as the water level in the inner tank 14 drops further, the second cam member 36 moves to a disengaged state (see column (d) in Figure 12). This releases the engagement between the second engaging portion 36c of the second cam member 36 and the second projection 10f of the second drain valve 10. As the second cam member 36 moves to a disengaged state, the second drain valve 10 begins to descend again toward the drain port 14a due to its own weight, and the second drain valve 10 seats in the drain port 14a and closes.

[0083] Thus, in the case of a small flush, the rise of the first float 26 is restricted by the regulating mechanism 22, and the first cam member 34 is kept disengaged regardless of the water level of the flushing water. As a result, the second drain valve 10 is held in place by the second float 28, and the amount of flushing water supplied to the toilet bowl body 2 is sufficient to lower the water level in the inner tank 14 from the shut-off water level WL0 to the dead water level WL3.

[0084] Meanwhile, as the water level of the cleaning water in the outer tank 12 decreases, the water supply valve 16 remains open, and water continues to be supplied to the inner tank 14 from the outlet hole 18f of the hydraulic drive mechanism. With the second drain valve 10 closed, the water level in the inner tank 14 rises as cleaning water flows into it. Once cleaning water is stored in the inner tank 14, it flows over the entire circumference of the upper edge of the inner tank 14 into the outer tank.

[0085] Furthermore, when the water level in the outer tank 12 rises to the shut-off water level WL0, the float 16d of the water supply valve 16 rises, and the water supply valve 16 closes. When the water supply valve 16 closes, the water supply to the hydraulic drive mechanism stops, the piston of the hydraulic drive mechanism is pushed down, and the rod 18c lowers along with it. As a result, the clutch mechanism 24 is engaged, returning to the standby state (see column (a) in Figure 12), and the small flush is completed.

[0086] Next, with reference to Figure 13, the function of the regulatory mechanism 22 in the large-scale flushing will be explained. In the standby state (see column (a) in Figure 13), flushing water is stored in the inner tank 14 up to the shut-off water level WL0. When the user rotates the lever handle 4a in the direction of a full flush, the first drain valve 8 is pulled up by the wire 20a, and the flushing water stored in the outer tank 12 is discharged from the first drain port 12a. When the water level of the flushing water in the outer tank 12 drops, the float 16d of the water supply valve 16 descends, and the water supply valve 16 opens. When the water supply valve 16 opens, the flushing water that flows in from the inlet pipe 16b is supplied to the hydraulic drive mechanism 18 via the outlet pipe 16c. This pushes up the piston 18b of the hydraulic drive mechanism 18, and the second drain valve 10 is pulled up via the rod 18c, causing the flushing water in the inner tank 14 to be discharged from the drain port 14a into the toilet bowl body 2, and the water level WL1 gradually decreases.

[0087] Furthermore, when the user rotates the lever handle 4a in the direction of a full wash, the ball chain 20d pulls up the mounting plate 22b of the regulating mechanism 22, and the retaining plate 22c of the regulating mechanism 22 rotates around the rotation axis 22a. As a result, the restriction on the rise of the first float 26 by the regulating mechanism 22 is released, and the first float 26 rises due to buoyancy (see column (b) in Figure 13).

[0088] Next, when the second drain valve 10 is raised to a predetermined position, the clutch mechanism 24 is disengaged (see column (c) in Figure 13). When the clutch mechanism 24 is disengaged, the second drain valve 10 begins to descend toward the drain port 14a due to its own weight. At this point, the restriction on the rise of the first float 26 by the regulating mechanism 22 is released, and the first float 26 rises, so the first cam member 34 is maintained in an engaged state. Also, the first cam member 34 is located above the second cam member 36. Therefore, the first projection 10e of the descending second drain valve 10 engages with the first engaging portion 34c of the first cam member 34, and the second drain valve 10 is held at a predetermined height by the first float 26.

[0089] Next, as the water level WL2 in the inner tank 14 drops further, the first float 26 and the second drain valve 10 descend in accordance with the water level WL2 in the inner tank 14 (see column (d) in Figure 13).

[0090] Next, as the water level in the inner tank 14 drops further, the first cam member 34 moves to a disengaged state (see column (e) in Figure 13). This releases the engagement between the first engaging portion 34c of the first cam member 34 and the first projection 10e of the second drain valve 10. As the first cam member 34 moves to a disengaged state, the second drain valve 10 begins to descend again toward the drain port 14a due to its own weight, and the second drain valve 10 seats in the drain port 14a and closes.

[0091] Thus, in the case of a full flush, the restriction on the rise of the first float 26 by the regulating mechanism 22 is released, and the first cam member 34 is maintained in an engaged state. As a result, the second drain valve 10 is held in place by the first float 26, and a larger volume of flushing water is supplied to the toilet bowl body 2 than the volume of flushing water used for a small flush until the water level in the inner tank 14 drops from the shut-off water level WL0 to the dead water level WL3.

[0092] Meanwhile, as the water level of the cleaning water in the outer tank 12 decreases, the water supply valve 16 remains open, and water continues to be supplied to the inner tank 14 from the outlet hole 18f of the hydraulic drive mechanism 18. With the second drain valve 10 closed, the water level in the inner tank 14 rises as cleaning water flows into it. Once cleaning water is stored in the inner tank 14, it flows over the entire circumference of the upper edge of the inner tank 14 into the outer tank 12.

[0093] Furthermore, when the water level in the outer tank 12 rises to the shut-off water level WL0, the float 16d of the water supply valve 16 rises, and the water supply valve 16 closes. When the water supply valve 16 closes, the water supply to the hydraulic drive mechanism 18 stops, the piston 18b of the hydraulic drive mechanism 18 is pushed down, and the rod 18c lowers along with it. As a result, the clutch mechanism 24 is engaged, returning to the standby state (see column (a) in Figure 13), and the major flushing is completed.

[0094] According to the washing water tank device 4 of the embodiment of the present invention, a regulating mechanism 22 is provided that restricts the rise of the first float 26 or the second float 28 during either a large wash or a small wash, and releases the restriction on the rise of the first float 26 or the second float 28 during the other wash. Therefore, a simple structure allows for stable switching between large and small washes.

[0095] Furthermore, according to the washing water tank device 4 of this embodiment, the regulating mechanism 22 is configured to restrict the rise of the first float 26 during light washing and to release the restriction on the rise of the first float 26 during heavy washing. Therefore, heavy washing and light washing can be stably switched with a simple structure.

[0096] According to the washing water tank device 4 of this embodiment, the regulating mechanism 22 comprises a rotating shaft 22a and a retaining plate 22c that rotates around the rotating shaft 22a, and the rotation of the retaining plate 22c restricts or releases the rising of the first float 26, so that large and small washes can be stably switched with a simple structure.

[0097] Furthermore, according to the washing water tank device 4 of this embodiment, the first float 26 is connected to a first shaft member 30 that moves in the vertical direction, and the first shaft member 30 comprises a shaft body portion 30a that extends in the vertical direction and a lower projection portion 30c that extends perpendicular to the axial direction of the shaft body portion 30a, and the upward movement of the first float 26 is restricted when the retaining plate 22c contacts the lower projection portion 30c of the first shaft member 30, so that large and small washes can be stably switched with a simple structure.

[0098] According to the cleaning water tank device 4 of this embodiment, the retaining plate 22c is positioned so as not to contact the shaft body portion 30a of the first shaft member 30 in the standby state, thereby preventing shaft misalignment and allowing the first shaft member 30 to move stably in the vertical direction.

[0099] Furthermore, according to the washing water tank device 4 of this embodiment, the drive mechanism is a hydraulic drive mechanism 18 that uses the water pressure of the washing water from the water supply source 6 to pull up the second drain valve 10, so the second drain valve 10 can be pulled up with a simple structure.

[0100] The cleaning water tank device 4 of this embodiment has a clutch mechanism 24 that raises the second drain valve 10 based on the cleaning start operation and lowers the second drain valve 10 at a predetermined timing, so that the second drain valve 10 can be lowered at a predetermined timing.

[0101] Furthermore, according to the flush toilet device 1 of this embodiment, it is possible to provide a flush toilet device equipped with a flush water tank device 4 that can reliably switch between large and small flushes with a simple structure.

[0102] Although embodiments of the present invention have been described above, various modifications can be made to the embodiments described above. [Explanation of symbols]

[0103] 1: Flush toilet device 2: Toilet bowl 2a: Bowl section 2b: Drain trap pipe 4: Washing water tank device 6: Water supply source 8: First drain valve 10: Second drain valve 10a: Valve seat 10b: Valve body 10c: Valve stem 10d: Guide member 10e: 1st protrusion 10f: 2nd protrusion 12: Outer Tank 14: Inner Tank 14a: Drain port for the inner tank 16: Water supply valve 18: Hydraulic drive mechanism 20: Operation Unit 20a: Wire 20b: Operating rotation axis 20c: Gear Unit 20d: Jade chain 20e: Ball chain mounting component 20g: Cylindrical tube 20h: Ball chain attachment part 20i: Guide section 22: Regulatory body 22a: Rotation axis 22b: Mounting plate 22c: Retaining plate 22d: Main unit 22e:Protrusion 22f: Mounting hole 24: Clutch mechanism 26: First float 28: Second float 30: 1st shaft member 30a: Shaft body 30b: Upper protrusion 30c: Lower protrusion 32: 2nd shaft member 33: Housing 33a: Top of the housing 33b: Lower part of the housing 33c: Side of the housing 33d: Housing opening 33e: Exterior of the housing 33f: Interior of the housing 34: First cam member 34a: 1st support shaft 34b: First mounting section 34c: First engaging part 36: Second cam member 36a: 2nd support shaft 36b: Second mounting section 36c: Second engaging part

Claims

1. A flushing water tank device that is attached to the toilet bowl body and used to supply flushing water, A storage tank for storing flushing water to be supplied to the toilet bowl body, A water supply valve that supplies cleaning water into this storage tank, A drain valve that opens and closes a drain port provided in the above-mentioned storage tank to supply the flushing water in the storage tank to the toilet bowl body, A first float is configured to be connectable to or detachable from this drain valve and to apply buoyancy to the drain valve during a major flush, A second float is configured to be connectable to or detachable from the drain valve and to apply buoyancy to the drain valve during a small flush, A drive mechanism that raises the drain valve to a predetermined height based on the operation to start the cleaning process, It has, A washing water tank device characterized by having a regulating mechanism that restricts the rise of the first float or the second float during either a large wash or a small wash, and releases the restriction on the rise of the first float or the second float during the other wash.

2. The washing water tank device according to claim 1, wherein the regulating mechanism is configured to restrict the rise of the first float during light washing and to release the restriction on the rise of the first float during heavy washing.

3. The above regulating mechanism comprises a rotating shaft and a retaining plate that rotates around this rotating shaft, The washing water tank device according to claim 2, wherein the rotation of the retaining plate is configured to restrict or release the rising of the first float.

4. The above-mentioned first float is connected to a shaft member that moves in the vertical direction, The shaft member described above comprises a shaft body portion extending in the vertical direction and a projection portion extending perpendicular to the axial direction of the shaft body portion. The washing water tank device according to claim 3, wherein the retaining plate is configured to restrict the upward movement of the first float by contacting the projection of the shaft member.

5. The cleaning water tank device according to claim 4, wherein the retaining plate is positioned so as not to come into contact with the shaft body of the shaft member when in standby mode.

6. The washing water tank device according to claim 1, wherein the above-mentioned drive mechanism is a hydraulic drive mechanism that uses the water pressure of the washing water from the water source to pull up the drain valve.

7. The cleaning water tank device according to claim 1, further comprising a clutch mechanism that raises the drain valve based on the above cleaning start operation and lowers the drain valve at a predetermined timing.

8. A flush toilet device equipped with a flushing water tank device according to any one of claims 1 to 7.

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