Water-washable toilet

Abstract

To provide a flush toilet bowl that can fix an asymmetrically shaped water storage tank to a ceramic toilet bowl body while suppressing its rattling.SOLUTION: A flush toilet bowl 1 has a toilet bowl body 4 and a tank device T. The tank device T has an asymmetrically shaped water storage tank 20 and a tank mounting member M to which the water storage tank is detachably attached. The tank mounting member has a base portion 44 that supports the water storage tank, and mounted portions 66 and 68 provided on the base portion to which mounting portions 62 and 64 of the water storage tank are detachably attached. While the mounting portions of the water storage tank are attached to the mounted portions of the tank mounting member, gaps G1-G8 are formed between the mounting portions of the water storage tank and the mounted portions of the tank mounting member to allow adjustment of the vertical or horizontal position of the water storage tank relative to the tank mounting member.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a flush toilet, and more particularly to a flush toilet that is flushed with flush water to expel waste. [Background technology]

[0002] Conventionally, flush toilets that are cleaned with flush water to expel waste have been known in which the water storage tank that stores the flush water to be supplied to the toilet body is fixed behind the bowl portion of the toilet body, as described in Patent Documents 1 and 2, for example. In the conventional flush toilets described in Patent Documents 1 and 2, the shape of the water storage tank is asymmetrical, so when the amount of flush water in the water storage tank changes depending on the flushing status of the toilet body, the position of the center of gravity of the water storage tank also changes. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-55320 [Patent Document 2] Japanese Patent Application Publication No. 2019-173315 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the conventional flush toilets described above, changes in the center of gravity of the storage tank in response to changes in the amount of flush water in the storage tank can cause the storage tank to tilt or attempt to elastically deform. Furthermore, such tilting of the water tank can cause the tank to rattle, which can lead to the generation of abnormal noise. In particular, when the toilet body is made of ceramic, there is a problem in that manufacturing errors in the toilet body can easily cause rattles in the fixed portion between the toilet body and the water tank. Therefore, in recent years, there has been a demand for ways to fix asymmetrically shaped water storage tanks, which are prone to tilting due to changes in the center of gravity caused by changes in the amount of flush water in the tank, to the ceramic toilet body, which has manufacturing tolerances, while minimizing rattling and reducing abnormal noise.

[0005] Therefore, the present invention was made to solve the problems of the prior art mentioned above and the issues that have been required in recent years, and aims to provide a flush toilet that can fix an asymmetrically shaped water storage tank to the ceramic toilet body while suppressing rattle. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems, the present invention provides a flush toilet that is flushed with flush water and discharges waste, comprising a ceramic toilet body equipped with a bowl portion that receives waste and a drain trap portion that discharges waste within the bowl portion, and a tank device that supplies flush water to the toilet body, the tank device being located behind the toilet body and above the floor and comprising an asymmetrically shaped water storage tank that stores flush water to be supplied to the toilet body, and a tank device fixed to the rear of the bowl portion of the toilet body so that the water storage tank can be removably attached. and a tank mounting member that is attached to the tank mounting member, the tank mounting member having a base portion that supports the water storage tank and a mounting receiving portion that is provided on the base portion and to which the mounting portion of the water storage tank is removably attached, and when the mounting portion of the water storage tank is attached to the mounting receiving portion of the tank mounting member, a gap is formed between the mounting portion of the water storage tank and the mounting receiving portion of the tank mounting member that allows the relative position of the water storage tank to be adjusted in the vertical or horizontal direction relative to the tank mounting member. In the present invention configured in this manner, even when the mounting portion of the water storage tank of the tank device is attached to the mounting portion of the tank mounting member, when the amount of flushing water in the asymmetrically shaped water storage tank of the tank device changes depending on the flushing status of the toilet body, the position of the center of gravity of the water storage tank also changes, and depending on the position of the center of gravity of the water storage tank, the water storage tank may tilt or may attempt to elastically deform. However, even in cases where tilting or deformation occurs in such an asymmetrically shaped water tank, when the mounting portion of the water tank is attached to the mounting base of the tank mounting member, the gap between the mounting portion of the water tank and the mounting base of the tank mounting member allows the water tank to tilt or deform, and the relative position of the water tank in the vertical or horizontal direction to the tank mounting member can be adjusted. Therefore, it is possible to suppress abnormal noises that are generated when tilting or deformation of the water tank causes rattles between the mounting portion of the water tank and the mounted portion of the tank mounting member. In addition, stress concentration on the fixed portion between the mounting portion of the water tank and the mounted portion of the tank mounting member due to tilting or deformation of the water tank can be alleviated, and damage to the mounting portion of the water tank and the mounted portion of the tank mounting member can also be suppressed. Furthermore, even if manufacturing errors occur in the ceramic toilet body to which the tank mounting member is fixed, the gap between the mounting portion of the water storage tank and the mounting portion of the tank mounting member can prevent poor installation between the mounting portion of the water storage tank and the mounting portion of the tank mounting member due to manufacturing errors in the toilet body itself, so the water storage tank can be easily attached to the toilet body via the tank mounting member. As a result, the asymmetrical water tank can be fixed to the ceramic toilet body while preventing rattling.

[0007] In the present invention, preferably, at least a portion of the bottom of the water storage tank is provided with a seating portion that can seat on the base portion of the tank mounting member when the mounting portion of the water storage tank is attached to the mounting portion of the tank mounting member. In the present invention configured in this manner, when the mounting portion of the water storage tank is attached to the mounting portion of the tank mounting member, the center of gravity of the water storage tank changes depending on the amount of flushing water in the water storage tank, and even if the water storage tank tilts or deforms, the seating portion provided on at least a part of the bottom of the water storage tank can seat on the base portion of the tank mounting member. Therefore, simply by attaching the mounting portion of the water storage tank to the mounting receiving portion of the tank mounting member, the base portion of the tank mounting member can easily and reliably support the water storage tank from below. Furthermore, even if there is a manufacturing error in the toilet body itself to which the tank mounting member is fixed, the gap between the mounting portion of the water storage tank and the mounted portion of the tank mounting member can mitigate tilting or deformation of the water storage tank itself, so the base portion of the tank mounting member can easily support the water storage tank from below via the seating portion at the bottom.

[0008] In the present invention, preferably, the water tank further has a lower rib protruding downward from the bottom of the water tank, and the base portion of the tank mounting member has an upper rib protruding upward, and when the mounting portion of the water tank is attached to the mounting portion of the tank mounting member, the lower rib is positioned so as to be close to the upper rib. In the present invention configured in this manner, when the mounting portion of the water storage tank is attached to the mounting portion of the tank mounting member, the lower rib on the bottom of the water storage tank is positioned so that it is close to the upper rib on the base portion of the tank mounting member.Therefore, even if the center of gravity of the water storage tank changes depending on the amount of flushing water in the water storage tank and the water storage tank tilts or deforms significantly, the lower rib on the bottom of the water storage tank will come into contact with the upper rib on the base portion of the tank mounting member. Therefore, the lower rib on the bottom of the water tank and the upper rib on the base of the tank mounting member come into contact with each other, effectively preventing the water tank from tilting or deforming.

[0009] In the present invention, the mounted portion of the tank mounting member is preferably provided below the mounting portion of the water storage tank. In the present invention configured in this manner, the mounting portion of the tank mounting member is located below the mounting portion of the water storage tank, so that when the mounting portion of the water storage tank is attached to the mounting portion of the tank mounting member, the mounting portion of the tank mounting member can reliably support the mounting portion of the water storage tank from below. Therefore, even if the center of gravity of the water storage tank changes depending on the amount of flush water in the water storage tank, causing the water storage tank to tilt or deform, and the relative position of the water storage tank to the tank mounting member varies in the vertical direction, the system can adequately respond.

[0010] In the present invention, preferably, the seating portion of the water tank is located closer to the center of gravity of the water tank than the lower rib, and the lower rib of the water tank is located so as to tilt toward the upper rib when the water tank tilts due to a change in its center of gravity. In the present invention configured in this manner, the seating portion at the bottom of the water tank is located closer to the center of gravity of the water tank than the lower rib, so that when the mounting portion of the water tank is attached to the mounting portion of the tank mounting member, the seating portion can be securely seated on the base portion of the tank mounting member. Furthermore, because the lower rib on the bottom of the water tank is designed to tilt toward the upper rib on the base of the tank mounting member when the water tank tilts due to a change in its center of gravity, even if the water tank attempts to tilt significantly, the lower rib on the water tank that is tilted toward the upper rib on the base of the tank mounting member will come into contact with the upper rib on the base of the tank mounting member. This reliably prevents the water tank from tilting excessively due to a change in its center of gravity. Furthermore, when the mounting portion of the water tank is attached to the mounting portion of the tank mounting member, the contact portion of the water tank that comes into contact with the tank mounting member can be concentrated on the seating portion and lower rib at the bottom of the water tank, other than the mounting portion of the water tank. This allows space to be secured around the water tank, which can be effectively utilized for the layout of peripheral equipment and related components.

[0011] In the present invention, preferably, the water tank has an asymmetric shape in the front-to-back, left-to-right, or up-to-down direction, having a horizontal region extending horizontally and a vertical region extending downward from either the left or right side of the horizontal region, and the lower rib is provided on the bottom of the horizontal region of the water tank. In the present invention configured in this manner, the water tank has an asymmetric shape in the front-to-back, left-to-right, or up-to-down direction, with a horizontal region extending horizontally and a vertical region extending downward from either the left or right side of this horizontal region, so the center of gravity of the water tank is likely to change depending on the amount of flush water in the water tank, and such changes in the center of gravity make the water tank prone to tilting. However, because the lower rib is provided on the bottom of the horizontal region of the water tank, even if the water tank tries to tilt significantly, the lower rib of the water tank tilted toward the upper rib of the base of the tank mounting member will come into contact with the upper rib of the base of the tank mounting member. This reliably prevents the water tank from tilting excessively due to a change in the center of gravity of the water tank. [Effects of the Invention]

[0012] According to the flush toilet of the present invention, the asymmetrically shaped water storage tank can be fixed to the ceramic toilet body while preventing rattling. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a diagram showing the overall configuration of a flush toilet according to an embodiment of the present invention. [Figure 2] FIG. 1 is a plan view of a flush toilet according to an embodiment of the present invention. [Figure 3] FIG. 1 is an exploded perspective view of a tank device in a flush water supply device for a flush toilet according to an embodiment of the present invention. [Figure 4A] FIG. 2 is a top view of the water storage tank in the tank apparatus for a flush toilet according to one embodiment of the present invention. [Figure 4B] 1 is a bottom view of a water storage tank in a flush toilet tank apparatus according to one embodiment of the present invention. [Figure 5]FIG. 3 is a cross-sectional view taken along line VV in FIG. [Figure 6] FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. [Figure 7] FIG. 2 is a partially enlarged perspective view of the bottom portion of the tank mounting member of the tank apparatus of the flush toilet according to one embodiment of the present invention, viewed obliquely from above. [Figure 8] FIG. 1 is a perspective view of a water storage tank of a flush toilet tank apparatus according to an embodiment of the present invention, viewed obliquely from below. [Figure 9] FIG. 2 is a partially enlarged side cross-sectional view showing the bottom portion of the water storage tank and tank mounting member of the tank device in the flush toilet according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0014] A flush toilet according to one embodiment of the present invention will now be described with reference to the accompanying drawings. First, the overall structure of a flush toilet according to one embodiment of the present invention will be explained in outline using FIGS. Figure 1 is a diagram showing the overall configuration of a flush toilet according to one embodiment of the present invention, and Figure 2 is a plan view of a flush toilet according to one embodiment of the present invention. As shown in Figures 1 and 2, a flush toilet 1 according to one embodiment of the present invention comprises a water supply channel (main water supply channel 2) through which flush water supplied from a main water supply source W0 such as a water line flows, a ceramic toilet body 4, and a flush water supply device 6.

[0015] Next, as shown in Figures 1 and 2, the toilet body 4 comprises a bowl portion 8 for receiving waste, a rim portion 10 formed on the upper edge of the bowl portion 8, and a drain trap portion 12 extending from the bottom of the bowl portion 8. 1 and 2, the flush water supply device 6, which will be described in detail later, is provided behind the bowl portion 8 of the toilet body 4, and is a functional part that enables flush water supplied from the main water supply passage 2 to be supplied to the toilet body 4. More specifically, this functional part is powered by electricity and includes the function of controlling the stop of flush water discharge into the bowl portion 8 of the toilet body 4.

[0016] Next, as shown in FIG. 2, a rim water channel 14 is formed inside the rim portion 10 on one of the left and right sides of the toilet body 4 (the right side when looking at the toilet body 4 from the front side). This rim water conduit 14 extends from the rear side of the toilet body 4 towards the front inside the rim section 10 on one of the left and right sides of the toilet body 4 (the right side when looking at the toilet body 4 from the front), and then bends towards the rear halfway, forming a so-called U-turn shape. Furthermore, a rim spout 14a is provided at the downstream end (rear downstream end) of this rim water conduit 14. Furthermore, the rim-side water supply passage 2a of the flush water supply device 6, which will be described in detail later, is connected to the upstream side of the rim water conduit 14 of the toilet body 4. Flush water supplied from this rim-side water supply passage 2a to the rim water outlet 14a is discharged rearward from the rim water outlet 14a into the bowl section 8, thereby performing rim spouting.

[0017] 1 and 2, a jet water conduit 16 is formed from the outer surface to the bottom of the bowl portion 8 of the toilet body 4. The downstream side of this jet water conduit 16 is directed toward the inlet 12a of the drain trap portion 12 at the bottom of the bowl portion 8, and a jet water outlet 16a is provided at the downstream end of the jet water conduit 16. Additionally, upstream of the jet water conduit 16 of the toilet body 4, there is provided a jet-side water supply conduit 2b of the flush water supply device 6, the details of which will be described later. Flush water supplied from this jet-side water supply conduit 2b to the jet water conduit 16 of the toilet body 4 is discharged from the jet water spout 16a towards the drain trap section 12, where jet spouting is performed. Here, as shown in FIG. 1, the upstream side of the rim-side water supply passage 2 a of the flush water supply device 6 is connected to a switching valve 18 at branch point B of the main water supply passage 2 . On the other hand, as shown in Figure 1, the upstream side of the jet side water supply passage 2b of the flush water supply device 6 is connected to the pressure pump 22 of the flush water supply device 6, which is provided downstream of the water storage tank 20 of the flush water supply device 6.

[0018] Next, the drain trap section 12 of the toilet body 4 consists of an inlet section 12a provided at the bottom of the bowl section 8, an ascending pipe 12b rising from this inlet section 12a, and a descending pipe 12c descending from this ascending pipe 12b, with the top section 12d being between the ascending pipe 12b and the descending pipe 12c. As shown in FIG. 1, the outlet 12e of the downcomer pipe 12c of the drain trap portion 12 is connected to the inlet of a drain socket S located at the rear and below of the toilet body 4. Furthermore, as shown in Figure 1, the outlet on the rear side of the drain socket S is connected to the inlet of a drain pipe D extending from the rear wall (not shown) side of the toilet body 4. This allows wastewater discharged from the outlet 12e of the drain trap part 12 of the toilet body 4 to be discharged from the drain socket S into the drain pipe D on the wall side, resulting in a drainage form known as "wall-side drainage." Furthermore, the flush toilet 1 of this embodiment is not limited to this type of "wall-side drainage" drainage configuration, but can also be applied to a so-called "floor-side drainage" drainage configuration in which wastewater discharged from the outlet portion 12e of the drain trap portion 12 of the toilet body 4 is discharged from the drain socket S into a drain pipe below the installation surface (floor surface F) of the bottom of the toilet body 4.

[0019] Next, each component of the flush water supply device 6 of the flush toilet 1 according to this embodiment will be explained in outline using FIG. First, as shown in FIG. 1, the flush water supply device 6 comprises, from the upstream side to the downstream side of the main water supply passage 2, a stop valve 24, a branch fitting 26, a valve unit 28, and a switching valve 18. Next, the valve unit 28 includes a constant flow valve 30, a diaphragm-type main valve 32, and an electromagnetic valve 34 such as a solenoid valve. The cleaning water supply device 6 also includes a controller 36. The controller 36 is capable of functioning as a control unit that controls the opening and closing operation of the on-off valve (solenoid valve 34) of the valve unit 28, the switching operation of the switching valve 18, and the rotation speed and operating time of the pressure pump 22.

[0020] Furthermore, the constant flow valve 30 of the valve unit 28 is used to restrict the flush water that has passed from the stop valve 24 in the main water supply passage 2 through the branch fitting 26 to a predetermined flow rate or less. Incidentally, in the case where a genital sanitary washing device (not shown) is provided for the flush toilet 1, the branch fitting 26 can also be connected to a water supply pipe (not shown) for supplying washing water to the genital sanitary washing device (not shown). Furthermore, in the valve unit 28, when the solenoid valve 34 is opened under the control of the controller 36, the main valve 32 opens, and the flushing water that has passed through the main valve 32 from the constant flow valve 30 is supplied to the switching valve 18 at the branch point B downstream of the main water supply line 2. Here, the switching valve 18 is capable of supplying flushing water from the main water supply passage 2 to both the rim side water supply passage 2a and the tank side water supply passage 2c at the same time, and the ratio of the amount of water supplied to the rim side and the tank side can be changed as desired.

[0021] Next, the flush water supply device 6 is equipped with a tank device T that enables flush water supplied from the main water supply channel 2 to be supplied to the toilet body 4. This tank device T, details of which will be described later, is equipped with a water storage tank 20 that is connected to the rear of the toilet body 4 and stores flushing water supplied from the main water supply line 2, a pump (pressurizing pump 22) that pressurizes the flushing water in this water storage tank 20 to the toilet body 4, and a tank mounting member M that fixes the water storage tank 20 to the toilet body 4. Furthermore, downstream of the branch point B on the downstream side of the main water supply channel 2, there are provided a rim side water supply channel 2a that communicates with the rim water conduit 14 of the toilet body 4, and a tank side water supply channel 2c that is connected to the water storage tank 20. As a result, the flush water supplied from the main water supply source W0 to the branch point B of the main water supply passage 2 is used as at least one of the rim water supply to the rim side water supply passage 2a and the tank water supply to the tank side water supply passage 2c.

[0022] Furthermore, the flush water supply device 6 is provided with a pump water supply passage 2d that extends from the downstream side of the tank side water supply passage 2c to the pressure pump 22, and a jet side water supply passage 2b that extends downstream from the pressure pump 22. As a result, in the flush toilet 1 of this embodiment, flush water supplied from the main water supply channel 2 under direct water supply pressure is supplied from the rim-side water supply channel 2a of the flush water supply device 6 through the rim water conduit 14 of the toilet body 4 to the rim water outlet 14a, making it possible for water to be discharged from the rim water outlet 14a (so-called "rim water discharge"). Furthermore, the flush water supplied from the main water supply passage 2 to the flush water supply device 6 passes through the tank side water supply passage 2c, the water storage tank 20, the pump water supply passage 2d and the pressure pump 22 of the flush water supply device 6, and then from the jet side water supply passage 2b through the jet water conduit 16 of the toilet body 4 to the jet water outlet 16a, making it possible for water to be discharged from the jet water outlet 16a (so-called ``jet water discharge''). In other words, the flush toilet 1 of this embodiment is capable of using both rim spouting of flush water directly pressurized from the main water supply line 2 and jet spouting of flush water pressurized by the pressure pump 22 from the water storage tank 20, making it a so-called hybrid flush toilet 1.

[0023] Next, an upper float switch 38 and a lower float switch 40 are respectively disposed inside the water storage tank 20. The water level inside the water storage tank 20 can be detected by these float switches 38, 40. For example, the upper float switch 38 switches on when the water level in the water tank 20 reaches a predetermined water level, and the controller 36 detects that the upper float switch 38 is on and closes the solenoid valve 34. On the other hand, the lower float switch 40 switches on when the water level in the water storage tank 20 drops to a predetermined water level that is lower than the predetermined water level detected by the upper float switch 38, and the controller 36 detects the on state of the lower float switch 40 and stops the pressure pump 22. In addition, the pressure pump 22 draws flush water stored in the water storage tank 20 into the pump water supply passage 2d, and pressurizes the flush water from this pump water supply passage 2d into the jet side water supply passage 2b, thereby discharging it from the jet water outlet 16a.

[0024] With this structure, during normal toilet flushing, the controller 36 detects the user's operation of the toilet flush switch (not shown), and activates the solenoid valve 34, the switching valve 18, and the pressure pump 22 in sequence. This causes water to start being discharged sequentially from the rim water outlet 14a and the jet water outlet 16a, and the cleaning water that has cleaned the inside of the bowl section 8 is discharged from the drain trap section 12 together with the dirt in the bowl section 8. Furthermore, after flushing is completed, the controller 36 opens the electromagnetic valve 34, the switching valve 18 is switched to the tank-side water supply passage 2c side, and flush water in the main water supply passage 2 is replenished to the water storage tank 20. When the water level in the water storage tank 20 rises and the upper float switch 38 detects the specified amount of water stored, the controller 36 closes the solenoid valve 34, causing the main valve 32 to close the main water supply line 2 and stopping the water supply.

[0025] Next, the specific structure of the tank device T in the flush water supply device 6 of the flush toilet 1 according to this embodiment will be explained with reference to FIGS. Figure 3 is an exploded perspective view of a tank apparatus in a flush water supply device for a flush toilet according to one embodiment of the present invention. Also, Figure 4A is a top view of the water storage tank in a tank apparatus for a flush toilet according to one embodiment of the present invention. Furthermore, Figure 4B is a bottom view of the water storage tank in a tank apparatus for a flush toilet according to one embodiment of the present invention.

[0026] As shown in FIGS. 2 and 3, the tank device T includes a toilet body 4, a tank mounting member M, a water storage tank 20, and an upper support plate 42, from the lower side. Here, the top cover 20a (see FIG. 2) of the water storage tank 20 shown in FIG. 3 is omitted so that the inside can be seen. First, the tank mounting member M has a base portion 44, and this base portion 44 has a rear wall portion 46 provided so as to extend upward from the rear end side thereof. As shown in FIG. 3, the base portion 44 of the tank mounting member M is adapted to be fixed to a pedestal portion 48 provided on the rear side of the drain trap portion 12 of the toilet body 4. More specifically, the base portion 44 has a pair of left and right fixing holes (screw holes 44a, 44b). In addition, the pedestal portion 48 of the toilet body 4 has a pair of left and right fixing holes (screw holes 48a, 48b) located below the pair of left and right fixing holes (screw holes 44a, 44b) of the base portion 44. As a result, each fixing hole (screw holes 44a, 44b) of the base portion 44 is fixed by each of two fixing screws 50, 52, with their central axes A1, A2 aligned so that they face each other in the vertical direction relative to each fixing hole (screw holes 48a, 48b) of the base portion 48 of the toilet body 4.

[0027] 3, fixing holes (screw holes 46c, 46d) are provided on both the left and right sides of the rear wall 46 of the tank mounting member M. Furthermore, a pair of left and right support parts 54, 56 extending in a columnar shape in the vertical direction are provided at the rear end and both left and right corners of the rear side interior of the toilet body 4, and fixing holes (screw holes 54a, 56a) are provided at the upper end of each support part 54, 56. As a result, each fixing hole (screw holes 46a, 46b) of the rear wall portion 46 of the tank mounting member M is fixed by each of two fixing screws 58, 60, with their central axes A3, A4 aligned so that they face each other in the vertical direction relative to each fixing hole (screw holes 54a, 56b) of each support portion 54, 56 of the toilet body 4.

[0028] Next, as shown in Figures 3 to 4B, the water tank 20 has a horizontal region V1 extending horizontally and a vertical region V2 extending downward from one of the left and right sides of this horizontal region V1 (the right side when looking at the water tank 20 from the front), and has an asymmetric shape in the front-to-back, left-to-right, and up-to-down directions. As shown in FIGS. 3 to 4B, the water storage tank 20 is provided with mounting portions (a left mounting portion 62 and a right mounting portion 64) that are attached to parts of the tank mounting member M from above. Furthermore, as shown in Figure 3, each mounting portion of the water tank 20 (left mounting portion 62, right mounting portion 64), details of which will be described later, is designed to be removably attached from above to each of the mounting portions (center mounting portion 66, right mounting portion 68) of the tank mounting member M located below and facing them in the vertical direction. That is, the respective mounting portions 66, 68 of the tank mounting member M are provided below the respective mounting portions 62, 64 of the water storage tank 20.

[0029] Here, the left mounting portion 62 and the right mounting portion 64 of the water tank 20 are positioned so that the center of gravity of the water tank 20 is not located on the imaginary line C1 (see Figure 4A) connecting the left mounting portion 62 and the right mounting portion 64. Furthermore, by providing gaps G1 to G8 for each of the mounting portions 62, 64, it is possible to prevent the load from concentrating on each of the mounting portions 62, 64 and damaging each of the mounting portions 62, 64, even if the mounting portions 62, 64 are not arranged so that their center of gravity is located on the imaginary line C1 connecting the two 62, 64. This makes it possible to arrange the mounting portions 62, 64 in relation to the position of the center of gravity of the water tank 20. Furthermore, by providing the lower rib 90 and the upper rib 92, the water tank 20 can be stably mounted while suppressing tilting, even if the center of gravity is not positioned on the imaginary line C1 connecting each mounting portion 62, 64.

[0030] Next, as shown in Figures 2 and 3, the upper support plate 42 has mounting portions (central mounting portion 70, right mounting portion 72) that are attached from above to each mounting portion (left mounting portion 62, right mounting portion 64) of the water tank 20, respectively. That is, the mounting portions 70 and 72 of the upper support plate 42 are provided above the mounting portions 62 and 64 of the water tank 20, respectively. 2 and 3, the upper support plate 42 is provided with a left-side mounting portion 76 that is mounted directly from above to a mounting portion (left-side mounting portion 74) of the tank mounting member M without using the water tank 20. The left-side mounting portion 76 of the upper support plate 42 is fixed to the left-side mounting portion 74 of the tank mounting member M with a fixing screw 78.

[0031] Next, referring to Figures 2 to 6, the mounting structures of each mounting portion of the water tank 20 (left mounting portion 62, right mounting portion 64), each mounted portion of the tank mounting member M (central mounting portion 66, right mounting portion 68), and each mounting portion of the upper support plate 42 (central mounting portion 70, right mounting portion 72) will be described in detail. 5 is a cross-sectional view taken along line VV in FIG. 2. Also, FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 2. Furthermore, First, as shown in Figures 3, 5 and 7, when the left mounting portion 62 of the water tank 20 and the central mounting portion 70 of the upper support plate 42 are each attached from above to the central mounting portion 66 of the tank mounting member M, the central axes A5 of the fixing hole (screw hole 66a) of the central mounting portion 66 of the tank mounting member M and the fixing hole (screw hole 70a) of the central mounting portion 70 of the upper support plate 42 are aligned. As a result, the central mounting portion 70 of the upper support plate 42 is fixed to the central mounted portion 66 of the tank mounting member M by the fixing screw 80.

[0032] Furthermore, in this mounted state of the water tank 20, as shown in Figure 5, the cylindrical protruding portion (cylindrical protruding portion 66b) of the central mounting portion 66 of the tank mounting member M is inserted into the mounting hole 62a of the left mounting portion 62 of the water tank 20. Furthermore, when the water tank 20 is mounted, as shown in Figure 5, the upper end surface 66c of the cylindrical protrusion 66b at the central mounting portion 66 of the tank mounting member M and the lower end surface 70b of the central mounting portion 70 of the upper support plate 42 are in contact with each other with no gap in the vertical direction. On the other hand, when the water tank 20 is mounted, as shown in Figure 5, the upper end surface 66c of the protruding portion 66b of the central mounting portion 66 of the tank mounting member M protrudes upward above the upper end (expanded diameter portion 62b) of the mounting hole 62a in the left mounting portion 62 of the water tank 20. This creates a vertical gap (upper gap G1) between the upper end (expanded diameter portion 62b) of the mounting hole 62a in the left mounting portion 62 of the water tank 20 and the lower end surface 70b of the central mounting portion 70 of the upper support plate 42. Furthermore, when the water tank 20 is mounted, as shown in Figure 5, the base end 66d of the protrusion 66b of the central mounting portion 66 of the tank mounting member M is positioned lower than the lower end of the mounting hole 62a of the left mounting portion 62 of the water tank 20, so that a vertical gap (lower gap G2) is formed between the lower end of the mounting hole 62a of the left mounting portion 62 of the water tank 20 and the base end 66d of the protrusion 66b of the central mounting portion 66 of the tank mounting member M.

[0033] Furthermore, when the water tank 20 is mounted, as shown in Figure 5, a radial gap (radial gaps G3, G4) is formed between the outer surface of the cylindrical protrusion 66b at the central mounting portion 66 of the tank mounting member M and the inner surface of the mounting hole 62a of the left mounting portion 62 of the water tank 20. In addition, the left side mounting portion 62 of the water tank 20 in the mounted state can move in the vertical direction, as well as the horizontal front-to-back and horizontal left-to-right directions, relative to the central mounting portion 66 of the tank mounting member M in the fixed state and the central mounting portion 70 of the upper support plate 42, due to these gaps G1, G2, G3, G4. This allows fine adjustment of the mounting position and posture of the water storage tank 20. Furthermore, with regard to the sizes of the gaps G1, G2, G3, and G4, the gaps G1 and G2 are set to be approximately the same as each other, and the gaps G3 and G4 are also set to be approximately the same as each other. Moreover, the gaps G1 and G2 are set larger than the gaps G3 and G4. Here, the vertical length dimensions H1, H2 of the gaps G1, G2 are preferably set to 1.3 mm to 1.7 mm, and most preferably to 1.5 mm. Furthermore, the length dimensions L1, L2 in the radial direction including the horizontal front-rear and left-right directions of the gaps G3, G4 are preferably set to 0.2 mm to 0.6 mm, and most preferably set to 0.4 mm.

[0034] Next, as shown in Figures 3 and 6, when the right-side mounting portion 64 of the water tank 20 and the right-side mounting portion 72 of the upper support plate 42 are each attached from above to the right-side mounting portion 68 of the tank mounting member M, the central axes A6 of the fixing hole (screw hole 68a) of the right-side mounting portion 68 of the tank mounting member M and the fixing hole (screw hole 72a) of the right-side mounting portion 72 of the upper support plate 42 are aligned. As a result, the right mounting portion 72 of the upper support plate 42 is fixed to the right mounting portion 68 of the tank mounting member M by the fixing screw 82.

[0035] Furthermore, in this mounted state of the water tank 20, as shown in Figure 6, the cylindrical protruding portion (cylindrical protruding portion 68b) of the right-side mounting portion 68 of the tank mounting member M is inserted into the mounting hole 64a of the right-side mounting portion 64 of the water tank 20. Furthermore, when the water tank 20 is mounted, as shown in Figure 6, the upper end surface 68c of the cylindrical protrusion 68b on the right-side mounting portion 68 of the tank mounting member M and the lower end surface 72b of the right-side mounting portion 72 of the upper support plate 42 are in contact with each other with no gap in the vertical direction. On the other hand, when the water tank 20 is mounted, as shown in Figure 6, the upper end surface 68c of the protruding portion 68b of the right-side mounting portion 68 of the tank mounting member M protrudes upward above the expanded diameter portion 64b of the mounting hole 64a in the right-side mounting portion 64 of the water tank 20. As a result, a vertical gap (upper gap G5) is formed between the expanded diameter portion 64b of the mounting hole 64a in the right mounting portion 64 of the water tank 20 and the lower end surface 72b of the right mounting portion 72 of the upper support plate . Furthermore, when the water tank 20 is mounted, as shown in Figure 6, the base end 68d of the protrusion 68b of the right-side mounting portion 68 of the tank mounting member M is positioned lower than the lower end of the mounting hole 64a of the right-side mounting portion 64 of the water tank 20, so that a vertical gap (lower gap G6) is formed between the lower end of the mounting hole 64a of the right-side mounting portion 64 of the water tank 20 and the base end 68d of the protrusion 68b of the right-side mounting portion 68 of the tank mounting member M.

[0036] Furthermore, when the water tank 20 is mounted, as shown in Figure 6, a radial gap (radial gaps G7, G8) is formed between the outer surface of the cylindrical protrusion 68b of the right-side mounting portion 68 of the tank mounting member M and the inner surface of the mounting hole 64a of the right-side mounting portion 64 of the water tank 20. In addition, the right side mounting portion 64 of the water tank 20 in the mounted state can move in the vertical direction, as well as in the horizontal front-to-back and left-to-right directions, relative to the right side mounting portion 68 of the tank mounting member M in the fixed state and the right side mounting portion 72 of the upper support plate 42, due to these gaps G5, G6, G7, and G8. This allows fine adjustment of the mounting position and posture of the water storage tank 20. Furthermore, with regard to the sizes of the gaps G5, G6, G7, and G8, the gaps G5 and G6 are set to be approximately the same as each other, and the gaps G7 and G8 are also set to be approximately the same as each other. Moreover, the gaps G5 and G6 are set larger than the gaps G7 and G8. Here, the vertical length dimensions H3 and H4 of the gaps G5 and G6 are preferably set to 1.3 mm to 1.7 mm, and most preferably to 1.5 mm. Furthermore, the length dimensions L3, L4 of the gaps G7, G8 in the radial direction including the horizontal front-rear and left-right directions are preferably set to 0.2 mm to 0.6 mm, and most preferably set to 0.4 mm.

[0037] Next, Figure 8 is a perspective view of the storage tank of a tank device for a flush toilet according to one embodiment of the present invention, viewed diagonally from below. Also, Figure 9 is a partially enlarged side cross-sectional view showing an enlarged view of the bottom of the storage tank and tank mounting member of the tank device for a flush toilet according to one embodiment of the present invention. First, as shown in Figures 4B and 7 to 9, the bottom 20b of the horizontal region V1 at the center of the left and right of the water tank 20 is provided with a seating portion 84 (a front seating portion 86, a rear seating portion 88) and a lower rib 90 arranged in the front-to-rear direction. Also, as shown in Figure 9, the seating portions 84 (front seating portion 86, rear seating portion 88) can be seated on the bottom surface 44e of the base portion 44 of the tank mounting member M when the mounting portions 62, 64 of the water tank 20 are attached to the mounting portions 66, 68 of the tank mounting member M.

[0038] On the other hand, as shown in Figure 9, the lower rib 90 protrudes downward from the bottom 20b of the water tank 20, but even when the mounting portions 62, 64 of the water tank 20 are attached to the mounting portions 66, 68 of the tank mounting member M, it does not come into contact with the bottom surface 44f rearward of the fixing hole (screw hole 44b) of the base portion 44 of the tank mounting member M. That is, a gap (bottom gap G9) is formed between the lowest bottom surface 90a of the lower rib 90 and the bottom surface 44f of the base portion 44 of the tank mounting member M, which is located rearward of the fixing hole (screw hole 44b) in the vertical direction. Here, the vertical length H5 of the bottom gap G9 is preferably set to 1.3 mm to 1.7 mm, and most preferably set to 1.5 mm.

[0039] Next, as shown in FIGS. 3, 7 and 9, an upper rib 92 that protrudes upward is provided on the bottom surface 44f of the base portion 44 of the tank mounting member M, rearward of the fixing holes (screw holes 44b). As shown in Figure 9, when the mounting portions 62, 64 of the water tank 20 are attached to the mounting portions 66, 68 of the tank mounting member M, the lower rib 90 of the water tank 20 is positioned so as to be close to the upper rib 92 of the base portion 44 of the tank mounting member M. As a result, a gap (rear gap G10) is formed between the rear end portion 90b of the lower rib 90 of the water storage tank 20 and the front end portion 92a of the upper rib 92 of the base portion 44 of the tank mounting member M. Here, the length L5 of the rear gap G10 in the front-rear direction is preferably set to 0.2 mm to 0.6 mm, and most preferably set to 0.4 mm.

[0040] As shown in FIG. 9, the seating portions 84 (front seating portion 86, rear seating portion 88) of the water tank 20 are provided closer to the center of gravity of the water tank 20 (front side) than the lower rib 90. As a result, the lower rib 90 of the water tank is configured to tilt toward the upper rib 92 (rearward) when the water tank 20 tilts forward due to a change in the center of gravity, for example. However, even if the water tank 20 tilts and the lower rib 90 tilts toward the upper rib 92 (rearward), the rear end portion 90b of the lower rib 90 comes into contact with the front end portion 92a of the upper rib 92, thereby preventing the water tank 20 from tilting further.

[0041] Next, the operation of the flush toilet 1 according to one embodiment of the present invention will be explained with reference to FIGS. First, with a flush toilet 1 according to one embodiment of the present invention, even when the mounting portions 62, 64 of the water storage tank 20 of the tank device T are attached to the mounting portions 66, 68 of the tank mounting member M, when the amount of flush water in the asymmetrically shaped water storage tank 20 of the tank device T changes depending on the flushing status of the toilet body 4, the position of the center of gravity of the water storage tank 20 also changes, and therefore, depending on the position of the center of gravity of the water storage tank 20, a phenomenon may occur in which the water storage tank 20 tilts in position or attempts to elastically deform. However, even in cases where tilting or deformation of such an asymmetrically shaped water tank 20 occurs, when the mounting portions 62, 64 of the water tank 20 are attached to the mounting bases 66, 68 of the tank mounting member M, the gaps G1 to G8 between the mounting portions 62, 64 of the water tank 20 and the mounting bases 66, 68 of the tank mounting member M allow tilting or deformation of the water tank 20, and the relative position of the water tank 20 in the vertical and horizontal directions to the tank mounting member M can be adjusted. Therefore, abnormal noises caused by rattles occurring between the mounting portions 62, 64 of the water tank 20 and the mounted portions 66, 68 of the tank mounting member M due to tilting or deformation of the water tank 20 can be suppressed. In addition, tilting or deformation of the water tank 20 can alleviate stress concentration on the fixed portions between the mounting portions 62, 64 of the water tank 20 and the mounting portions 66, 68 of the tank mounting member M, thereby suppressing damage to the mounting portions 62, 64 of the water tank 20 and the mounting portions 66, 68 of the tank mounting member M. Furthermore, even if manufacturing errors occur in the ceramic toilet body 4 to which the tank mounting member M is fixed, the gaps G1 to G8 between the mounting portions 62, 64 of the water storage tank 20 and the mounting portions 66, 68 of the tank mounting member M can prevent poor mounting between the mounting portions 62, 64 of the water storage tank 20 and the mounting portions 66, 68 of the tank mounting member M due to manufacturing errors in the toilet body 4 itself, so the water storage tank 20 can be easily mounted to the toilet body 4 via the tank mounting member M. As a result, the asymmetrical water tank 20 can be fixed to the ceramic toilet body 4 while preventing rattling.

[0042] Furthermore, with the flush toilet 1 of this embodiment, when the mounting portions 62, 64 of the water storage tank 20 are attached to the mounting receiving portions 66, 68 of the tank mounting member M, even if the center of gravity of the water storage tank 20 changes depending on the amount of flush water in the water storage tank 20, causing the water storage tank 20 to tilt or deform, the seating portion 84 (86, 88) provided on part of the bottom 20b of the water storage tank 20 can seat on the bottom surface 44e of the base portion 44 of the tank mounting member M. Therefore, simply by attaching the mounting portions 62, 64 of the water tank 20 to the mounting receiving portions 66, 68 of the tank mounting member M, the base portion 44 of the tank mounting member M can easily and reliably support the water tank 20 from below. Furthermore, even if a manufacturing error occurs in the toilet body 4 itself to which the tank mounting member M is fixed, the gaps G1 to G8 between the mounting portions 62, 64 of the water tank 20 and the mounting receiving portions 66, 68 of the tank mounting member M can mitigate tilting or deformation of the water tank 20 itself. Therefore, the base portion 44 of the tank mounting member M can easily support the water storage tank 20 from below via the seating portion 84 (86, 88) of the bottom portion 20b.

[0043] Furthermore, according to the flush toilet 1 of this embodiment, when the mounting portions 62, 64 of the water storage tank 20 are attached to the mounting receiving portions 66, 68 of the tank mounting member M, the lower rib 90 at the bottom of the water storage tank 20 is positioned so as to be close to the upper rib 92 of the base portion 44 of the tank mounting member M. As a result, the center of gravity of the water storage tank 20 changes depending on the amount of flush water in the water storage tank 20, and even if the water storage tank 20 tilts or deforms significantly, the lower rib 90 at the bottom of the water storage tank 20 will come into contact with the upper rib 92 on the base portion 44 of the tank mounting member M. Therefore, the lower rib 90 at the bottom of the water tank 20 and the upper rib 92 at the base portion 44 of the tank mounting member M come into contact with each other, thereby effectively preventing the water tank 20 from tilting or deforming.

[0044] Furthermore, according to the flush toilet 1 of this embodiment, the mounting portions 66, 68 of the tank mounting member M are provided below the mounting portions 62, 64 of the water storage tank 20, so that when the mounting portions 62, 64 of the water storage tank 20 are attached to the mounting portions 66, 68 of the tank mounting member M, the mounting portions 66, 68 of the tank mounting member M can reliably support the mounting portions 62, 64 of the water storage tank 20 from below. Therefore, even if the center of gravity of the water storage tank 20 changes depending on the amount of flush water in the water storage tank 20, causing the water storage tank 20 to tilt or deform, and the relative position of the water storage tank 20 to the tank mounting member M varies in the vertical direction, the system can adequately respond to this.

[0045] Furthermore, with the flush toilet 1 according to this embodiment, the seating portion 84 (86, 88) at the bottom of the storage tank 20 is located closer to the center of gravity of the storage tank (front side) than the lower rib 90. This allows the seating portion 84 (86, 88) to be securely seated on the bottom surface 44e of the base portion 44 of the tank mounting member M when the mounting portions 62, 64 of the water storage tank 20 are attached to the mounting portions 66, 68 of the tank mounting member M (see Figure 9). Furthermore, when the water tank 20 tilts due to a change in the center of gravity, the lower rib 90 at the bottom of the water tank 20 is provided to tilt toward the upper rib 92 side (rear side) of the base portion 44 of the tank mounting member M. As a result, even if the water tank 20 attempts to tilt significantly, the lower rib 90 of the water tank 20, which is tilted toward the upper rib 92 of the base portion 44 of the tank mounting member M, comes into contact with the upper rib 92 of the base portion 44 of the tank mounting member M. This reliably prevents the water tank 20 from tilting excessively due to a change in the center of gravity of the water tank 20. Furthermore, when the mounting portions 62, 64 of the water tank 20 are attached to the mounting portions 66, 68 of the tank mounting member M, the contact portions of the water tank 20 that come into contact with the tank mounting member M can be concentrated on the seating portions 84 (86, 88) at the bottom of the water tank 20 and the lower rib 90, other than the mounting portions 62, 64 of the water tank 20. This allows the space around the water tank 20 to be secured, and can be effectively utilized for the layout of peripheral devices and related components.

[0046] Furthermore, according to the flush toilet 1 of this embodiment, the water tank 20 has a horizontal region V1 extending horizontally and a vertical region V2 extending downward from one of the left and right sides of this horizontal region V1 (the right side when looking at the water tank 20 from the front), and because it has an asymmetrical shape in the front-to-back, left-to-right, and up-to-down directions, the center of gravity of the water tank 20 is likely to change depending on the amount of flush water in the water tank 20, and such changes in the center of gravity make it easy for the water tank 20 to tilt. However, because the lower rib 90 is provided at the bottom of the lateral region V1 of the water tank 20, even if the water tank 20 attempts to tilt significantly, the lower rib 90 of the water tank 20, which is tilted toward the upper rib 92 of the base portion 44 of the tank mounting member M, comes into contact with the upper rib 92 of the base portion 44 of the tank mounting member M. This makes it possible to reliably prevent the water tank 20 from tilting excessively due to a change in the center of gravity of the water tank 20. [Explanation of symbols]

[0047] 1. Flush toilet according to one embodiment of the present invention (hybrid flush toilet) 2 Main water supply channel 2a Rim side water supply channel 2b Jet side water supply channel 2c Tank side water supply channel 2d Pump supply line 4 Toilet body 6 Cleaning water supply device (functional part) 8 Bowl section 10 Rim 12 Drain trap section 12a Inlet of drain trap 12b Drain trap riser 12c Downcomer pipe of drain trap 12d Top of drain trap 12e Outlet of the drain trap 14 Rim Waterway 14a Rim Spout 16 Jet Waterway 16a Jet nozzle 18 Switching valve 20 Water Tank 20a Top lid 20b Bottom of water tank 22 Pressure pump 24 Stop valve 26 Branch fitting 26a Power outage switching valve 28 Valve unit 30 Constant flow valve 32 Diaphragm type main valve 34 Solenoid valve 36 Controller 38 Upper float switch 40 Lower float switch 42 Upper support plate 44 Base of tank mounting member 44a Fixing holes, screw holes 44b fixing holes, screw holes 44c fixing holes, screw holes 44d fixing holes, screw holes 44e Bottom of base 44f Bottom of the base 46 Rear wall of base of tank mounting member 46a Fixing holes, screw holes 46b Fixing holes, screw holes 46c fixing holes, screw holes 46d fixing holes, screw holes 48 Toilet bowl base 48a screw hole 48b screw hole 50 fixing screw 52 Fixing screw 54 Toilet bowl support 54a screw hole 56 Toilet bowl body support 56a screw hole 58 Fixing screw 60 Fixing screw 62 Left side mounting part of water tank (mounting part of water tank) 62a Mounting hole 62b Upper end of mounting hole, enlarged diameter part 64 Right side mounting part of water tank (mounting part of water tank) 64a mounting hole 64b Expanded diameter part 66 Central mounting portion of tank mounting member (mounting portion of tank mounting member) 66a Fixing holes, screw holes 66b Cylindrical protrusion 66c Upper end surface of cylindrical protrusion 66d Base end of cylindrical protrusion 68 Right side mounting portion of tank mounting member (mounting portion of tank mounting member) 68a Fixing holes, screw holes 68b Cylindrical protrusion 68c Upper end surface of cylindrical protrusion 70 Upper support plate central mounting part 70a fixing holes, screw holes 70b Lower end surface of the central mounting portion of the upper support plate 72 Right side mounting part of upper support plate 72a Fixing holes, screw holes 74 Left side mounting part of tank mounting member 76 Upper support plate left mounting part 78 Fixing screw 80 Fixing screw 82 Fixing screw 84 Seating area 86 Front seating area 88 Rear seating area 90 Lower Rib 90a Minimum bottom surface of lower rib 90b Rear end of lower rib 92 Upper rib 92a Front end of upper rib A1 Central axis of fixing hole A2 Fixing hole center axis A3 Fixing hole center axis A4 Fixing hole center axis A5 Fixing hole center axis A6 Fixing hole center axis A7 Fixing hole center axis B Branch C1 Virtual line D Drain pipe E Double wall section F Floor G1 Upper clearance G2 Lower Clearance G3 Radial clearance G4 Radial clearance G5 Upper Clearance G6 Lower Clearance G7 Radial clearance G8 Radial Clearance G9 Bottom Gap G10 rear clearance H1 Vertical length of the upper gap H2 Vertical length of the lower gap H3 Vertical length of upper gap H4 Vertical length of the lower gap H5 Vertical length of bottom gap L1 Radial length dimension of radial gap L2 Radial length dimension of radial gap L3 Radial length dimension of radial gap L4 Radial length dimension of radial gap L5 Length dimension of rear gap in the front-to-rear direction M Tank Mounting Part S drain socket T-tank device V1 Horizontal area inside the water tank V2 Vertical area inside the water tank W0 Main water supply source

Claims

1. A flush toilet that is flushed with flush water to discharge waste, a ceramic toilet body having a bowl portion for receiving waste and a drain trap portion for discharging waste from within the bowl portion; a tank device for supplying flush water to the toilet body, The tank device includes an asymmetrical water storage tank that is provided at a distance behind the toilet body and above the floor, and that stores flush water to be supplied to the toilet body; a tank mounting member that is fixed to the rear side of the bowl portion of the toilet body and to which the water storage tank is detachably mounted; an upper support plate; the tank mounting member includes a base portion that supports the water storage tank, and a mounting portion that is provided on the base portion and to which the mounting portion of the water storage tank is detachably attached, A flush toilet characterized in that, when the mounting portion of the upper support plate is fixed to the mounting portion of the tank mounting member without the water tank in between, a gap is formed between the mounting portion of the water tank and the mounting portion of the tank mounting member, which allows the relative position of the water tank to be adjusted in the vertical or horizontal direction with respect to the tank mounting member.

2. A flush toilet according to claim 1, wherein at least a portion of the bottom of the water storage tank is provided with a seat that can rest on the base of the tank mounting member when the mounting portion of the water storage tank is attached to the mounting portion of the tank mounting member.

3. A flush toilet according to claim 2, wherein the water storage tank further comprises a lower rib that protrudes downward from the bottom of the water storage tank, and the base portion of the tank mounting member comprises an upper rib that protrudes upward, and when the mounting portion of the water storage tank is attached to the mounting receiving portion of the tank mounting member, the lower rib is positioned so as to be adjacent to the upper rib.

4. 4. The flush toilet according to claim 1, wherein the mounting portion of the tank mounting member is provided below the mounting portion of the water storage tank.

5. A flush toilet according to claim 3, wherein the seating portion of the water tank is located closer to the center of gravity of the water tank than the lower rib, and the lower rib of the water tank is arranged to tilt toward the upper rib when the water tank tilts due to a change in its center of gravity.

6. A flush toilet according to claim 3 or 5, wherein the water tank has an asymmetric shape in the front-to-back, left-to-right, or up-to-down direction, comprising a horizontal region extending horizontally and a vertical region extending downward from either the left or right side of the horizontal region, and the lower rib is provided on the bottom of the horizontal region of the water tank.

Images