FLUSH TOILET

Description

This application claims benefit of priority to Japanese Patent Application No. 2024-149966, filed on Aug. 30, 2024, the entire content of which is incorporated herein by reference.

BACKGROUND OF THE INVENTION

Field of the Invention

The present invention relates to a flush toilet, and more particularly to a wall mounted flush toilet.

Description of the Related Art

Conventionally, a flush toilet is known in which a reservoir tank is accommodated in a space below a bowl within a toilet main body as described in Japanese Patent Laid-Open Nos. 2024-031499, 2024-031498, and 2014-114635, and Chinese Utility Model No. 219825498.

In the conventional flush toilet described in Japanese Patent Laid-Open No. 2024-031499, which is a wall mounted flush toilet, the reservoir tank is fixed to a wall surface along with the toilet main body.

In the conventional flush toilets described in Japanese Patent Laid-Open Nos. 2024-031498 and 2014-114635, which are a wall mounted flush toilet and a floor-standing flush toilet, the reservoir tank is fixed to the toilet main body by a bracket.

Furthermore, the conventional flush toilet described in Chinese Utility Model No. 219825498, which is a wall mounted flush toilet, includes a protrusion protruding in a lateral direction from an inner wall of the toilet main body, and the reservoir tank is fixed to the protrusion.

However, in the conventional flush toilet described in Japanese Patent Laid-Open No. 2024-031499, since the reservoir tank is fixed to the wall surface along with the toilet main body, there is a problem that it is necessary to remove the toilet main body in order to remove the reservoir tank at the time of maintenance.

In contrast, in the conventional flush toilets as described in Japanese Patent Laid-Open Nos. 2024-031498 and 2014-114635, since the reservoir tank is fixed to the toilet main body by a bracket, there is a problem that it is possible to remove the reservoir tank without removing the toilet main body at the time of maintenance, but the use of the bracket causes a reduction in the space for accommodating the reservoir tank within the toilet main body.

On the other hand, in the conventional flush toilet as described in Chinese Utility Model No. 219825498, since the reservoir tank is fixed to the protrusion without using the bracket, there is a problem that a space for accommodating the reservoir tank within the toilet main body can be increased, but since the reservoir tank is fixed to the protrusion protruding in the lateral direction from the inner wall of the toilet main body, the protrusion may be damaged by the weight of the reservoir tank.

Therefore, the present invention has been made to solve the above-described problems, and an object thereof is to provide a flush toilet capable of increasing a space within a toilet main body and capable of stably fixing a tank device to the toilet main body.

SUMMARY OF THE INVENTION

To solve the above-described problems, the present invention provides a wall mounted flush toilet comprising a toilet main body including a bowl configured to receive waste, a discharge trap conduit connected below the bowl to discharge the waste, and a skirt provided to surround the bowl and the discharge trap conduit from outside, a tank device disposed in a space below the bowl in the toilet main body and configured to store flush water to be supplied to the toilet main body, and a fixing member configured to fix the tank device to the toilet main body, in which the toilet main body includes a hollow portion whose interior is formed by a closed space and a tank fixing portion at which the tank device is fixed by the fixing member, and the tank fixing portion is provided in the hollow portion.

In the present invention configured as described above, the toilet main body includes the hollow portion whose interior is formed by the closed space, and the tank fixing portion at which the tank device is fixed by the fixing member, and the tank fixing portion is provided in the hollow portion, so that the space within the toilet main body can be enlarged and the tank device can be stably fixed to the toilet main body.

In the present invention, preferably, the tank fixing portion is provided in the skirt.

In the present invention configured as described above, the tank fixing portion is provided in the skirt, so that the space within the toilet main body can be enlarged.

In the present invention, preferably, a step recessed upward is formed in a bottom surface of the toilet main body, and the tank fixing portion is provided in the step.

In the present invention configured as described above, the step recessed upward is formed in the bottom surface of the toilet main body, and the tank fixing portion is provided in the step, so that the tank device can be stably fixed to the toilet main body.

In the present invention, preferably, a wall fixing portion for fixing the toilet main body to a wall surface is provided, and the tank fixing portion is provided in the wall fixing portion.

In the present invention configured as described above, the wall fixing portion for fixing the toilet main body to the wall surface is provided, and the tank fixing portion is provided in the wall fixing portion, so that the space within the toilet main body can be enlarged.

In the present invention, preferably, three or more tank fixing portions are provided, and the tank fixing portions are arranged so that a center of gravity of the tank device is located inside a virtual line connecting the tank fixing portions in a bottom view.

In the present invention configured as described above, the three or more tank fixing portions are provided, and the tank fixing portions are arranged so that the center of gravity of the tank device is located inside the virtual line connecting the tank fixing portions in a bottom view, so that the tank device can be stably fixed to the toilet main body.

In the present invention, preferably, the tank device includes an upper tank member, and a lower tank member joined to the upper tank member, and the lower tank member is fixed to the tank fixing portion.

In the present invention configured as described above, the tank device includes the upper tank member, and the lower tank member joined to the upper tank member, and the lower tank member is fixed to the tank fixing portion, so that the upper tank member and the lower tank member can be stably joined as compared with a case where the upper tank member is fixed to the tank fixing portion.

In the present invention, preferably, a function device configured to supply flush water to the toilet main body, a base plate configured to support the function device, and a fixing member configured to fix the base plate to the toilet main body are provided, the toilet main body includes a base plate fixing portion at which the base plate is fixed by the fixing member, and the base plate fixing portion is provided in the hollow portion.

In the present invention configured as described above, the function device for supplying flush water to the toilet main body, the base plate configured to support the function device, and the fixing member configured to fix the base plate to the toilet main body are provided, the toilet main body includes the base plate fixing portion at which the base plate is fixed by the fixing member, and the base plate fixing portion is provided in the hollow portion, so that the space in the toilet main body can be enlarged, and the base plate can be stably fixed to the toilet main body.

In the present invention, preferably, the base plate fixing portion is provided in the skirt.

In the present invention configured as described above, the base plate fixing portion is provided in the skirt, so that the space within the toilet main body can be enlarged.

In the present invention, preferably, a step recessed upward is formed in a bottom surface of the toilet main body, and the base plate fixing portion is provided in the step.

In the present invention configured as described above, the step recessed upward is formed in the bottom surface of the toilet main body, and the base plate fixing portion is provided in the step, so that the base plate can be stably fixed to the toilet main body.

In the present invention, preferably, a wall fixing portion for fixing the toilet main body to a wall surface is provided, and the base plate fixing portion is provided in the wall fixing portion.

In the present invention configured as described above, the wall fixing portion for fixing the toilet main body to the wall surface is provided, and the base plate fixing portion is provided in the wall fixing portion, so that the space within the toilet main body can be enlarged.

In the present invention, preferably, three or more base plate fixing portions are provided, and the base plate fixing portions are arranged so that a center of gravity of the base plate is located inside a virtual line connecting the base plate fixing portions in a bottom view.

In the present invention configured as described above, the three or more base plate fixing portions are provided, and the base plate fixing portions are arranged so that the center of gravity of the base plate is located inside the virtual line connecting the base plate fixing portions in a bottom view, so that the base plate can be stably fixed to the toilet main body.

In the present invention, preferably, at least one of the tank fixing portion and at least one of the base plate fixing portion are commonly formed as the same fixing portion.

In the present invention configured as described above, at least one of the tank fixing portion and at least one of the base plate fixing portion are commonly formed as the same fixing portion, so that the space within the toilet main body can be enlarged.

In the present invention, preferably, the tank fixing portion closest to a center of gravity of the tank device is formed separately from the base plate fixing portion.

In the present invention configured as described above, the tank fixing portion closest to the center of gravity of the tank device is formed separately from the base plate fixing portion, so that the tank device can be stably fixed to the toilet main body.

In the present invention, preferably, the base plate fixing portion closest to a center of gravity of the base plate is formed separately from the tank fixing portion.

In the present invention configured as described above, the base plate fixing portion closest to the center of gravity of the base plate is formed separately from the tank fixing portion, so that the base plate can be stably fixed to the toilet main body.

In the present invention, preferably, in a bottom view, the tank device is formed into an L shape, and the base plate is formed into a rectangular shape.

In the present invention configured as described above, in a bottom view, the tank device is formed into an L shape, and the base plate is formed into a rectangular shape, so that a lower opening of the toilet main body can be covered.

According to the flush toilet of the present invention, the space within the toilet main body can be enlarged and the tank device can be stably fixed to the toilet main body.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view illustrating a flush toilet according to one embodiment of the present invention;

FIG. 2 is a top view of a state in which a sanitary washing device of the flush toilet according to one embodiment of the present invention is removed;

FIG. 3 is a cross-sectional side view when viewed along line III-III in FIG. 2;

FIG. 4A is a perspective view of function devices of the flush toilet according to one embodiment of the present invention when obliquely viewed from an upper-left side;

FIG. 4B is a perspective view of the function devices of the flush toilet according to one embodiment of the present invention when obliquely viewed from an upper-right side;

FIG. 5 is a configuration diagram illustrating a water supply conduit through which flush water of the flush toilet according to one embodiment of the present invention flows;

FIG. 6 is a bottom view of a toilet main body of the flush toilet according to one embodiment of the present invention;

FIG. 7A is a perspective view of a tank device of the flush toilet according to one embodiment of the present invention when obliquely viewed from an upper-left side;

FIG. 7B is a perspective view of the tank device of the flush toilet according to one embodiment of the present invention when obliquely viewed from an upper-right side;

FIG. 8 is a bottom view of the tank device of the flush toilet according to one embodiment of the present invention;

FIG. 9 is a perspective view of a base plate of the flush toilet according to one embodiment of the present invention;

FIG. 10 is a bottom view of the base plate of the flush toilet according to one embodiment of the present invention;

FIG. 11 is a bottom view illustrating a state in which the tank device and the base plate are attached to the toilet main body of the flush toilet according to one embodiment of the present invention;

FIG. 12 is an enlarged cross-sectional view when viewed along line XII-XII in FIG. 11; and

FIG. 13 is an enlarged cross-sectional view when viewed along line XIII-XIII in FIG. 11.

DETAILED DESCRIPTION OF THE INVENTION

A flush toilet 1 according to one embodiment of the present invention will be described below with reference to the accompanying drawings.

First of all, a basic structure of the flush toilet 1 according to one embodiment of the present invention will be described with reference to FIGS. 1 to 3.

FIG. 1 is a perspective view illustrating a flush toilet according to one embodiment of the present invention, FIG. 2 is a top view of a state in which a sanitary washing device of the flush toilet according to one embodiment of the present invention is removed, and FIG. 3 is a cross-sectional side view when viewed along line III-III in FIG. 2. In FIG. 2, a rim conduit, a jet conduit, and a jet water supply pipe are indicated by dotted lines.

In this specification, a description is given taking the front side as “front”, the back side as “rear”, the left side as “left”, and the right side as “right” when the flush toilet is viewed from front.

As illustrated in FIG. 1, the flush toilet 1 according to one embodiment of the present invention is a wall mounted flush toilet in which its back surface is fixed to a wall surface W. The flush toilet 1 includes a toilet main body 2 made of ceramic, a tank device 4 that stores flush water to be supplied to the toilet main body 2, and a sanitary washing device 6 mounted on an upper surface of the toilet main body 2. A stop cock 8 for supplying, to the flush toilet 1, the flush water from a water supply source (not illustrated) such as the waterworks or shutting off the flush water is provided on the wall surface W. The stop cock 8 is connected to the flush toilet 1 via a water supply pipe 10.

As illustrated in FIGS. 2 and 3, the toilet main body 2 is formed with a bowl 12 that receives waste, a discharge trap conduit 14 that is connected below the bowl 12 to discharge the waste, and a skirt 16 provided to surround the bowl 12 and the discharge trap conduit 14 from the outside. A space S in the toilet main body 2 is formed between the bowl 12 and the discharge trap conduit 14 and the skirt 16.

The bowl 12 includes a bowl-shaped waste receiving surface 18, and a rim 20 formed along a top edge portion of the bowl 12. Pooled water is formed inside the bowl 12.

The rim 20 is formed with a rim spout port 22 that spouts the flush water rearward, and a rim conduit 24 for guiding the flush water to the rim spout port 22. The rim spout port 22 is disposed in the vicinity of the center in the front-rear direction on the right side of the bowl 12. The flush water spouted from the rim spout port 22 flows downward to the waste receiving surface 18 while swirling along an inner peripheral surface of the rim 20, and washes the bowl 12.

A jet spout port 26 that spouts the flush water toward an inlet 14a of the discharge trap conduit 14, and a jet conduit 28 that supplies the flush water to the jet spout port 26 are formed below the bowl 12. The jet spout port 26 is disposed to face the inlet 14a of the discharge trap conduit 14. The flush water spouted from the jet spout port 26 flows into the discharge trap conduit 14 to cause a siphon action.

The flush toilet 1 according to one embodiment of the present invention is a siphon jet flush toilet in which a siphon action is caused by jet spout to discharge waste, but is not limited to this form, and as another form, may be, for example, a wash-down flush toilet that a water-flow action is caused by the fall of flush water to wash away waste, or a siphon flush toilet in which a siphon action is caused only by rim spout to discharge waste.

The discharge trap conduit 14 includes the inlet 14a connected below the bowl 12, an ascending conduit 14b extending upward from the inlet 14a, a top portion 14c that is disposed at the highest position of the ascending conduit 14b to define a pooled water level, and a rear conduit 14d extending substantially horizontally rearward from the top portion 14c. The rear conduit 14d of the discharge trap conduit 14 is connected to a discharge pipe (not illustrated) in the wall surface W via a discharge socket 30.

The sanitary washing device 6 includes a main body (not illustrated), a washing nozzle (not illustrated) provided advance or retreat from the main body, a toilet seat (not illustrated) turnably attached to the main body, and a toilet seat cover turnably attached to the main body so as to cover the toilet seat. The water supply pipe 10 connected to the stop cock 8 is connected to the main body of the sanitary washing device 6 to supply the flush water jetted out from the wash nozzle.

As illustrated in FIGS. 2 and 3, the space S within the toilet main body 2 is formed between the bowl 12 and the discharge trap conduit 14 and the skirt 16. The tank device 4 is accommodated in the space S surrounded by the skirt 16 below the bowl 12 within the toilet main body 2. Function devices for supplying the flush water to the toilet main body are accommodated in the space S behind the bowl 12 within the toilet main body 2. The function devices are, for example, a water supply valve device 32, a pump device 34, a switching valve device 36, and a controller 38. A base plate 40 is provided in a lower opening 2a surrounded by the skirt 16 of the toilet main body 2, and the above-described function devices are supported by the base plate 40.

Next, the tank device 4, the function devices, and the base plate 40 that are accommodated in the space S within the toilet main body 2 will be described with reference to FIGS. 4A and 4B.

FIG. 4A is a perspective view of the function devices of the flush toilet according to one embodiment of the present invention when obliquely viewed from an upper-left side, and FIG. 4B is a perspective view of the function devices of the flush toilet according to one embodiment of the present invention when obliquely viewed from an upper-right side. In FIG. 4A, a direction in which the flush water flows is indicated by arrows.

The tank device 4 includes a reservoir tank 42 that stores the flush water to be supplied to the toilet main body 2, a tank water supply unit 46 for causing the flush water from a tank water supply pipe 44 to flow into the reservoir tank 42, a float switch 48 that detects water level of the flush water stored in the reservoir tank 42, and a fixing member 50 for fixing the tank device 4 to a bottom surface of the toilet main body 2.

The reservoir tank 42 is formed into an L shape in a top view, or is formed to extend forward on the right side of the discharge trap conduit 14, and then bend to extend leftward. The reservoir tank 42 is a tank made of a resin that can store the flush water used for rim spout and jet spout and store an amount of flush water of about 4 liters.

The tank water supply unit 46 is disposed on an upper portion of the reservoir tank 42. An upstream side of the tank water supply unit 46 is connected to the tank water supply pipe 44, and a downstream side of the tank water supply unit 46 is connected to the reservoir tank 42. The tank water supply unit 46 has a flow channel formed therein to guide the flush water from the tank water supply pipe 44 toward the reservoir tank 42.

The float switch 48 is disposed above the reservoir tank 42. The float switch 48 is turned off when the water level in the tank becomes lower than a stopped water level (full water level), so that the water supply valve device 32 is opened. The float switch 48 is turned on when the water level in the tank rises to reach the stopped water level, so that the water supply valve device 32 is closed.

An overflow unit 62 is attached to the reservoir tank 42 to discharge the flush water to the outside of the tank in a case where water supply to the tank is continued due to the failure of the float switch 48, for example. The overflow unit 62 is connected to the discharge socket 30 to discharge the flush water overflown from the reservoir tank 42 into the discharge socket 30 via the overflow unit 62.

The water supply valve device 32 includes a fixed flow valve (not illustrated) for keeping a flow rate of the flush water constant, an on-off valve (not illustrated) that is provided downstream of the fixed flow valve and switches between supplying and shutting off the flush water, and an electromagnetic value (not illustrated) for driving the on-off valve. An upstream side of the water supply valve device 32 is connected to a water supply source (not illustrated) via the stop cock 8 and the water supply pipe 10, and a downstream side of the water supply valve device 32 is connected to the sanitary washing device 6 via a water supply pipe 52 for sanitary washing device and is connected to the tank device 4 via the tank water supply pipe 44. When the electromagnetic value is electromagnetically opened, the on-off valve is opened, so that the flush water from the water supply source is supplied to the tank device 4 via the tank water supply pipe 44.

The pump device 34 is a pressurizing pump that sucks the flush water stored in the tank device 4 to pressure-feed the flush water to the toilet main body 2. An upstream side of the pump device 34 is connected to the tank device 4 via an upstream side connection pipe 54, and a downstream side of the pump device 34 is connected to the switching valve device 36 via a downstream side connection pipe 56. When the pump device 34 is operated, the flush water stored in the tank device 4 is pressure-fed to be spouted from the rim spout port 22 and the jet spout port 26, so that the toilet is washed. Note that in the flush toilet 1 according to one embodiment of the present invention, the flush water stored in the tank device 4 is supplied to the rim spout port 22 and the jet spout port 26, but is not limited to this form, and the present invention can also be applied to, for example, a form in which all flush water stored in the tank device 4 is spouted from the rim spout port 22 as another form.

The switching valve device 36 includes a switching valve body (not illustrated) to switch water supply conduit that supplies the flush water supplied from the pump device 34 to each of the rim spout port 22 and the jet spout port 26. An upstream side of the switching valve device 36 is connected to the pump device 34 via the downstream side connection pipe 56, and a downstream side of the switching valve device 36 is connected to the rim conduit 24 via a rim water supply pipe 58 and is connected to the jet conduit 28 via a jet water supply pipe 60. In a state in which the switching valve body is closed, the flush water from the pump device 34 is supplied to the rim spout port 22, and in a state in which the switching valve body is open, the flush water from the pump device 34 is supplied to the rim spout port 22 and the jet spout port 26.

The controller 38 is electrically connected to a remote controller (not illustrated), the tank device 4 (the float switch 48), the sanitary washing device 6, the water supply valve device 32, and the pump device 34 so as to be able to receive and transmit various signals. When receiving a flushing start signal for a large flush or a small flush from the remote controller, the controller 38 drives or stops the pump device 34 on the basis of flush sequence stored in advance. Specifically, when a user operates the remote controller, the controller 38 drives the pump device 34 to spout the flush water stored in the tank device 4 from the rim spout port 22 and the jet spout port 26. The controller 38 causes the water supply valve device 32 to be opened to supply the water to the tank, and when the float switch 48 detects a full water state, the controller 38 causes the water supply valve device 32 to be closed to end the water supply to the tank.

The pipes (the water supply pipe 10, the tank water supply pipe 44, the water supply pipe 52 for sanitary washing device, the upstream side connection pipe 54, the downstream side connection pipe 56, the rim water supply pipe 58, and the jet water supply pipe 60) connected to the above-described function devices have the flexibility so as to be able to absorb a manufacturing error or the like of the toilet main body 2 made of ceramic.

Next, the water supply conduit through which the flush water of the flush toilet 1 according to one embodiment of the present invention will be described with reference to FIG. 5.

FIG. 5 is a configuration diagram illustrating the water supply conduit through which the flush water of the flush toilet according to one embodiment of the present invention flows.

On the water supply conduit of the flush toilet 1, the stop cock 8, the water supply valve device 32, the tank device 4, the pump device 34, and the switching valve device 36 are arranged in order from the upstream side. First of all, the flush water is supplied from the water supply source to the water supply valve device 32 via the stop cock 8 and the water supply pipe 10. The flush water supplied to the water supply valve device 32 is supplied to the sanitary washing device 6 via the water supply pipe 52 for sanitary washing device and is supplied to the tank device 4 via the tank water supply pipe 44. The flush water stored in the tank device 4 is sucked up by the pump device 34 via the upstream side connection pipe 54, and is supplied to the switching valve device 36 via the downstream side connection pipe 56. The flush water supplied by the switching valve device 36 is spouted from the rim spout port 22 via the rim water supply pipe 58 and the rim conduit 24, and is spouted from the jet spout port 26 via the jet water supply pipe 60 and the jet conduit 28. The flush water overflown from the tank device 4 is discharged to the discharge socket 30 via the overflow unit 62.

Next, the toilet main body 2 of the flush toilet 1 according to one embodiment of the present invention will be described in detail with reference to FIG. 6.

FIG. 6 is a bottom view of the toilet main body of the flush toilet according to one embodiment of the present invention. In FIG. 6, an inner wall 16a and an outer wall 16b of the skirt 16 of the toilet main body 2 are indicated by dotted lines.

As illustrated in FIG. 6, as fixing portions for fixing the tank device 4 to the toilet main body 2, a first tank fixing portion 64 on a right front side, a second tank fixing portion 66 on a right rear side, and a third tank fixing portion 68 on a left front side are provided in the bottom surface of the toilet main body 2. In addition, as fixing portions for fixing the base plate 40 to the toilet main body 2, a first base plate fixing portion 70 on a left front side, and a second base plate fixing portion 72 on a left rear side are provided in the bottom surface of the toilet main body 2. The third tank fixing portion 68 and the first base plate fixing portion 70 are commonly formed as the same fixing portion. Each of the fixing portions for the tank device 4 and the base plate 40 includes a fixing hole into which the fixing member 50 is to be inserted.

As illustrated in FIG. 6, the skirt 16 includes the inner wall 16a that forms an inside wall surface, and the outer wall 16b that is disposed outside the inner wall 16a and forms an outside wall surface. The skirt 16 is formed with a space closed by the inner wall 16a and the outer wall 16b in a bottom view. In this way, the skirt 16 is formed with a hollow portion 74 whose interior is formed by the closed space (see FIG. 6). The hollow portion 74 is a portion formed by single molding to mold a hollow molded body. In addition, the hollow portion 74 is provided with the tank fixing portions for the tank device 4 and the base plate fixing portions for the base plate 40. This makes it possible to stably fix the tank device 4 and the base plate 40 because the hollow portion 74 formed by the space closed by the inner wall 16a and the outer wall 16b has a higher strength than that of a solid portion (a portion formed by double molding to mold a solid molded body) and is not damaged.

Each fixing portion for the tank device 4 and the base plate 40 is provided in a bottom surface of the skirt 16. The second tank fixing portion 66 and the second base plate fixing portion 72 are provided in a wall fixing portion 76 for fixing the toilet main body 2 to the wall surface W. The wall fixing portion 76 has a predetermined thickness in the forward direction from a back surface of the toilet main body 2. Furthermore, two steps 78 recessed upward are formed in a bottom surface of the wall fixing portion 76. The steps 78 are arranged to be symmetrical with respect to a center line CL at a center of the toilet main body 2 in the right-left direction. The second tank fixing portion 66 and the second base plate fixing portion 72 are provided in the respective steps 78. This makes it possible to stably fix the tank device 4 and the base plate 40.

Next, the tank device 4 of the flush toilet 1 according to one embodiment of the present invention will be described in detail with reference to FIGS. 7A, 7B, and 8.

FIG. 7A is a perspective view of the tank device of the flush toilet according to one embodiment of the present invention when obliquely viewed from an upper-left side, FIG. 7B is a perspective view of the tank device of the flush toilet according to one embodiment of the present invention when obliquely viewed from an upper-right side, and FIG. 8 is a bottom view of the tank device of the flush toilet according to one embodiment of the present invention.

As illustrated in FIGS. 7A and 7B, the reservoir tank 42 of the tank device 4 is formed into an L shape in a top view, and is formed to be asymmetrical with respect to the center line CL at the center of the toilet main body 2 in the right-left direction. The reservoir tank 42 includes a first tank portion 80 disposed on the right side with respect to the center line CL, a second tank portion 82 disposed on the left side with respect to the center line CL, and a connecting portion 84 that connects the first tank portion 80 and the second tank portion 82.

The capacity (volume) of the second tank portion 82 is set to be smaller than the capacity of the first tank portion 80. An upper surface wall 82a of the second tank portion 82 is set to be lower than an upper surface wall 80a of the first tank portion 80. The height dimension of the second tank portion 82 in the up-down direction is set to be smaller than the height dimension of the first tank portion 80 in the up-down direction, and the length of the second tank portion 82 in the front-rear direction is set to be shorter than the length of the first tank portion 80 in the front-rear direction. This makes it possible to arrange the function devices such as the pump device 34 and the base plate 40 in a rear region A of the second tank portion 82.

An inlet path 80b extending in the up-down direction is formed in the top surface wall 80a of the first tank portion 80, so that the flush water from the water supply source flows into the tank from the inlet path 80b. The float switch 48 that detects the water level of the flush water stored in the tank is fixed to the upper surface wall 80a of the first tank portion 80. Furthermore, an overflow pipe 80c for discharging the flush water to the outside of the tank in a case where water supply to the tank is continued due to the failure of the float switch 48, for example, is fixed to the upper surface wall 80a of the first tank portion 80. The overflow pipe 80c is connected to the overflow unit 62 so that the flush water discharged from the overflow pipe 80c is discharged into the discharge socket 30 via the overflow unit 62.

An outlet path 82c extending in the front-rear direction is formed in a rear surface wall 82b of the second tank portion 82. The outlet path 82c is connected to the upstream side connection pipe 54 so that the flush water in the tank is supplied to the pump device 34. An upper surface wall 84a of the connecting portion 84 is set to be lower than an upper surface wall 82a of the second tank portion 82. The upper surface wall 84a of the connecting portion 84 is formed into a recessed shape recessed downward. The jet conduit 28 is arranged on the upper surface wall 84a having the recessed shape.

As illustrated in FIGS. 7A and 7B, the reservoir tank 42 of the tank device 4 includes an upper tank member 86, and a lower tank member 88 joined to the upper tank member 86, and is configured by joining the upper tank member 86 and the lower tank member 88. A joining portion of the upper tank member 86 and the lower tank member 88 is joined to prevent leakage of the flush water.

As illustrated in FIG. 8, the lower tank member 88 is formed into an L shape. An attaching portion extending further outward than an outer peripheral edge of the upper tank member 86 is formed in the lower tank member 88 in a bottom view. The attaching portion includes a first attaching portion 88a on the right front side, a second attaching portion 88b on the right rear side, and a third attaching portion 88c on the left front side. The first attaching portion 88a, the second attaching portion 88b, and the third attaching portion 88c of the lower tank member 88 are arranged at respective positions corresponding to the first tank fixing portion 64, the second tank fixing portion 66, and the third tank fixing portion 68 of the toilet main body 2. A though hole into which the fixing member 50 is to be inserted is formed in each attaching portion of the lower tank member 88. The fixing member 50 is inserted into the through hole, so that the tank device 4 is fixed to the toilet main body 2.

Temporarily fixing portions 88d for temporarily fixing the tank device 4 to the base plate 40 are provided in the lower tank member 88. The temporarily fixing portions 88d of the tank device 4 are adapted to engage with temporarily fixing portions 40c of the base plate 40. The temporarily fixing portions 88d are used for positioning when the tank device 4 and the base plate 40 are fixed.

Next, the base plate 40 of the flush toilet 1 according to one embodiment of the present invention will be described in detail with reference to FIGS. 9 and 10.

FIG. 9 is a perspective view of the base plate of the flush toilet according to one embodiment of the present invention, and FIG. 10 is a bottom view of the base plate of the flush toilet according to one embodiment of the present invention.

As illustrated in FIGS. 9 and 10, the base plate 40 is formed by a resin-made plate having a rectangular shape. An attaching portion extending further outward than a rectangular outer peripheral edge of the base plate 40 is formed in the base plate 40 in a bottom view. The attaching portion includes a first attaching portion 40a on the left front side, and a second attaching portion 40b on the left rear side. The first attaching portion 40a and the second attaching portion 40b of the base plate 40 are arranged at respective positions corresponding to the first base plate fixing portion 70 and the second base plate fixing portion 72 of the toilet main body 2. A though hole into which the fixing member 50 is to be inserted is formed in each attaching portion of the base plate 40. The fixing member 50 is inserted into the through hole, so that the base plate 40 is fixed to the toilet main body 2.

The temporarily fixing portions 40c for temporarily fixing the base plate 40 to the tank device 4 are provided in the base plate 40. The temporarily fixing portions 40c of the base plate 40 are adapted to engage with the temporarily fixing portions 88d of the tank device 4. The temporarily fixing portions 40c of the base plate 40 are used for positioning when the tank device 4 and the base plate 40 are fixed. The temporarily fixing portions 40c of the base plate 40 are arranged at positions corresponding to the temporarily fixing portions 88d of the lower tank member 88. The temporarily fixing portions 40c of the base plate 40 are superimposed on the temporarily fixing portions 80d of the lower tank member 88 from above, so that the base plate 40 is supported by the lower tank member 88.

A pump fixing portion 40d extending upward to attach the pump device 34 is provided on the upper surface of the base plate 40. A water supply valve fixing portion 40e extending upward to attach the water supply valve device 32 is provided on the upper surface of the base plate 40. Furthermore, a through hole 40f through which the water supply pipe 10 passes is formed in the base plate 40.

Next, the positional relationship among the toilet main body 2, the tank device 4, and the base plate 40 of the flush toilet according to one embodiment of the present invention will be described in detail with reference to FIGS. 11 to 13.

FIG. 11 is a bottom view illustrating a state in which the tank device and the base plate are attached to the toilet main body of the flush toilet according to one embodiment of the present invention, FIG. 12 is an enlarged cross-sectional view when viewed along line XII-XII in FIG. 11, and FIG. 13 is an enlarged cross-sectional view when viewed along line XIII-XIII in FIG. 11.

As illustrated in FIG. 11, the tank device 4 and the base plate 40 are fixed so as to cover the lower opening 2a of the toilet main body 2. The first tank fixing portion 64 and the first attaching portion 88a of the lower tank member 88 are arranged on the right front side with respect to the center line CL of the toilet main body 2. In addition, the second tank fixing portion 66 and the second attaching portion 88b of the lower tank member 88 are arranged on the right rear side with respect to the center line CL. Furthermore, the third tank fixing portion 68, the first base plate fixing portion 70, the third attaching portion 88c of the lower tank member 88, and the first attaching portion 40a of the base plate 40 are arranged on the left front side with respect to the center line CL. In addition, the second base plate fixing portion 72 and the second attaching portion 40b of the base plate 40 are arranged on the left rear side with respect to the center line CL.

The tank device 4 is fixed to the toilet main body 2 by means of the first tank fixing portion 64, the second tank fixing portion 66, and the third tank fixing portion 68. The first tank fixing portion 64, the second tank fixing portion 66, and the third tank fixing portion 68 are arranged so that the center of gravity G1 of the tank device is located inside a virtual line V connecting the first tank fixing portion 64, the second tank fixing portion 66, and the third tank fixing portion 68 in a bottom view. This makes it possible to stably fix the tank device 4. In the flush toilet 1 according to one embodiment of the present invention, the tank device 4 is fixed to the toilet main body 2 by means of three fixing portions, but is not limited to this form, and as another form, may be fixed by means of two fixing portions or four or more fixing portions.

The base plate 40 is fixed to the toilet main body 2 by means of the first base plate fixing portion 70 and the second base plate fixing portion 72 of the toilet main body 2. The temporarily fixing portions 40c of the base plate 40 engage with the temporarily fixing portions 88d of the lower tank member 88, so that the base plate 40 is supported by the lower tank member 88. In the flush toilet 1 according to one embodiment of the present invention, the base plate 40 is fixed to the toilet main body 2 by means of two base plate fixing portions, but is not limited to this form, and as another form, may be fixed by means of three or more base plate fixing portions. In such a case, the base plate fixing portions are preferably arranged so that the center of gravity of the base plate is located inside a virtual line connecting the base plate fixing portions.

The third tank fixing portion 68 and the first base plate fixing portion 70 of the toilet main body 2 are commonly formed as the same fixing portion. This makes it possible to fix the third attaching portion 88c of the lower tank member 88 and the first attaching portion 40a of the base plate 40 together by means of one fixing member 50. Each fixing portion (64, 66, 72) of the toilet main body 2 other than the third tank fixing portion 68 and the first base plate fixing portion 70 is independently formed to be separated from each other. In particular, the first tank fixing portion 64 closest to the center of gravity G1 of the tank device 4 is formed separately from the base plate fixing portion. This makes it possible to stably fix the tank device 4. The second base plate fixing portion 72 closest to the center of gravity G2 of the base plate 40 is formed separately from the tank fixing portion. This makes it possible to stably fix the base plate 40.

As illustrated in FIG. 12, the first attaching portion 88a of the lower tank member 88 is fixed to the first tank fixing portion 64 by means of the fixing member 50. The fixing member 50 includes a rubber bushing 50a inserted into the hollow portion 74 from a fixing hole in the first tank fixing portion 64, a nut 50b embedded in the rubber bushing 50a, a bolt 50c threaded into the nut 50b, and a washer 50d that is brought into contact with a surface of the lower tank member 88 when the bolt 50c is tightened. The nut 50b is moved downward when the bolt 50c is tightened, and the rubber bushing 50a is elastically deformed to be pressed against a back surface of the first tank fixing portion 64. This enables the first attaching portion 88a of the lower tank member 88 to be fixed to the first tank fixing portion 64. Note that the fixing structure by the fixing member 50 has the same configuration as that of the fixing portion of another toilet main body 2.

As illustrated in FIG. 13, the third attaching portion 88c of the lower tank member 88 and the first attaching portion 40a of the base plate 40 are fixed together to the third tank fixing portion 68 (the first base plate fixing portion 70) of the toilet main body 2 by means of the fixing member 50. The first attaching portion 40a of the base plate 40 is fixed, being located above the third attaching portion 88c of the lower tank member 88. This makes it possible for the base plate 40 to be supported by the tank device 4.

Hereinafter, the advantageous effects of the flush toilet 1 according to one embodiment described above will be described.

First of all, according to the flush toilet 1 according to one embodiment of the present invention, the toilet main body 2 includes the hollow portion 74 whose interior is formed by the closed space, and the first tank fixing portion 64, the second tank fixing portion 66, and the third tank fixing portion 68 at which the tank device 4 is fixed by the fixing member 50, and each tank fixing portion is provided in the hollow portion 74, so that the space S within the toilet main body 2 can be enlarged and the tank device 4 can be stably fixed to the toilet main body 2.

According to the flush toilet 1 according to one embodiment of the present invention, the first tank fixing portion 64, the second tank fixing portion 66, and the third tank fixing portion 68 are provided in the skirt 16, so that the space S within the toilet main body 2 can be enlarged.

Furthermore, according to the flush toilet 1 according to one embodiment of the present invention, the step 78 recessed upward is formed in the bottom surface of the toilet main body 2, and the second tank fixing portion 66 is provided in the step 78, so that the tank device 4 can be stably fixed to the toilet main body 2.

According to the flush toilet 1 according to one embodiment of the present invention, the wall fixing portion 76 for fixing the toilet main body 2 to the wall surface W is provided, and the second tank fixing portion 66 is provided in the wall fixing portion 76, so that the space S within the toilet main body 2 can be enlarged.

Furthermore, according to the flush toilet 1 according to one embodiment of the present invention, three or more first tank fixing portions 64, the second tank fixing portion 66, and the third tank fixing portion 68 are provided, and each tank fixing portion is arranged so that the center of gravity of the tank device 4 is located inside a virtual line V connecting the tank fixing portion 64, the second tank fixing portion 66, and the third tank fixing portion 68 in a bottom view, so that the tank device 4 can be stably fixed to the toilet main body 2.

According to the flush toilet 1 according to one embodiment of the present invention, the tank device 4 includes the upper tank member 86 and the lower tank member 88 joined with the upper tank member 86, and the lower tank member 88 is fixed to each tank fixing portion, so that the upper tank member 86 and the lower tank member 88 can be stably joined as compared with a case where the upper tank member 86 is fixed to each tank fixing portion.

Furthermore, according to the flush toilet 1 according to one embodiment of the present invention, the function devices configured to supply the flush water to the toilet main body 2, the base plate 40 configured to support the function devices, and the fixing member 50 configured to fix the base plate 40 to the toilet main body 2 are provided, the toilet main body 2 includes the first base plate fixing portion 70 and the second base plate fixing portion 72 at which the base plate 40 is fixed by the fixing member 50, and the first base plate fixing portion 70 and the second base plate fixing portion 72 are provided in the hollow portion 74, so that the space S within the toilet main body 2 can be enlarged and the base plate 40 can be stably fixed to the toilet main body 2.

According to the flush toilet 1 according to one embodiment of the present invention, the first base plate fixing portion 70 and the second base plate fixing portion 72 are provided in the skirt 16, so that the space S within the toilet main body 2 can be enlarged.

Furthermore, according to the flush toilet 1 according to one embodiment of the present invention, the step 78 recessed upward is formed in the bottom surface of the toilet main body 2, and the second base plate fixing portion 72 is provided in the step 78, so that the base plate 40 can be stably fixed to the toilet main body 2.

According to the flush toilet 1 according to one embodiment of the present invention, the wall fixing portion 76 for fixing the toilet main body 2 to the wall surface W is provided, and the second base plate fixing portion 72 is provided in the wall fixing portion 76, so that the space S within the toilet main body 2 can be enlarged.

Furthermore, according to the flush toilet 1 according to one embodiment of the present invention, the third tank fixing portion 68 and the first base plate fixing portion 70 are commonly formed, so that the space S within the toilet main body 2 can be enlarged. In addition, the tank device and the base plate can be easily fixed to the toilet main body.

According to the flush toilet 1 according to one embodiment of the present invention, among the tank fixing portions, the first tank fixing portion 64 closest to the center of gravity of the tank device 4 is formed separately from the first base plate fixing portion 70 and the second base plate fixing portion 72, so that the tank device 4 can be stably fixed to the toilet main body 2.

Furthermore, according to a variation of the flush toilet 1 according to one embodiment of the present invention, among the base plate fixing portions, the fixing portion closest to the center of gravity of the base plate 40 is formed separately from the tank fixing portion, so that the base plate 40 can be stably fixed to the toilet main body 2.

According to the flush toilet 1 according to one embodiment of the present invention, the tank device 4 is formed into an L shape, and the base plate 40 is formed into a rectangular shape in a bottom view, so that the lower opening 2a of the toilet main body 2 can be covered.

According to the flush toilet according to another embodiment of the present invention, three or more base plate fixing portions are provided, and the base plate fixing portions are arranged so that the center of gravity of the base plate 40 is located inside a virtual line connecting the base plate fixing portions in a bottom view, so that the base plate 40 can be stably fixed to the toilet main body 2.

The present invention is not limited to the embodiments described above, and various changes and modifications can be made within the scope of the technical idea described in the claims.

REFERENCE SIGNS LIST

• • 1: flush toilet
  • 2: toilet main body
  • 4: tank device
  • 12: bowl
  • 14: discharge trap conduit
  • 16: skirt
  • 16a: inner wall
  • 16b: outer wall
  • 32: water supply valve device
  • 34: pump device
  • 36: switching valve device
  • 38: controller
  • 40: base plate
  • 40a: first attaching portion of base plate
  • 40b: second attaching portion of base plate
  • 40c: temporarily fixing portion of base plate
  • 40d: pump fixing portion of base plate
  • 40e: water supply valve fixing portion of base plate
  • 40f: through hole in base plate
  • 42: reservoir tank
  • 50: fixing member
  • 50a: rubber bushing
  • 50b: nut
  • 50c: bolt
  • 50d: washer
  • 64: first tank fixing portion
  • 66: second tank fixing portion
  • 68: third tank fixing portion
  • 70: first base plate fixing portion
  • 72: second base plate fixing portion
  • 74: hollow portion
  • 76: wall fixing portion
  • 78: step
  • 86: upper tank member
  • 88: lower tank member
  • 88a: first attaching portion of lower tank member
  • 88b: second attaching portion of lower tank member
  • 88c: third attaching portion of lower tank member
  • 88d: temporarily fixing portion of lower tank member
  • CL: center line at center of toilet main body in right-left direction
  • S: space in toilet main body
  • A: rear region of second tank portion in space in toilet main body
  • G1: center of gravity of reservoir tank
  • V: virtual line connecting tank fixing portions
  • W: wall surface