JP7678973B2 - flush toilet - Google Patents

Description

The present invention relates to flush toilets, and in particular to flush toilets that are flushed with flush water to expel waste.

Conventionally, flush toilets that are flushed with flush water to expel waste have been known in which a cover member is removably attached to a skirt portion that forms the outer periphery of a ceramic toilet body, covering from the outside at least a portion of the toilet body rearward of the center in the fore-aft direction, as described in Patent Documents 1 and 2. These cover members are removed, for example, during maintenance, when flushing the toilet during a power outage, and when cleaning the toilet body, allowing the surface of the toilet body to be wiped clean.
In the conventional flush toilet described in the above-mentioned Patent Document 1, the front edge of the cover member attached to the rear end of the skirt of the toilet body is inclined downward from the front upper end to the rear lower end, so as to follow the inclined surface that inclines downward from the front upper end to the rear lower end of the rear end surface of the skirt of the toilet body. Furthermore, when the cover member is attached to the toilet body, the front edge of the cover member is elastically deformed outward while abutting against the rear end surface (inclined surface) of the skirt of the toilet body, and then is biased in the direction of abutting against the inclined surface. Also, a strip of sponge (buffer) is attached to the inner surface (rear side surface) of the front edge of the cover member, so that when the cover member is attached to the toilet body, the sponge on the rear side surface of the front edge of the cover member abuts against the rear end surface (inclined surface) of the skirt of the toilet body without any gaps.
Furthermore, in the conventional flush toilet described in Patent Document 2 mentioned above, a fixing member such as a hook-and-loop fastener is provided on the mounting surface of the mounting part of the cover member, while a fixing member such as a hook-and-loop fastener is also adhered to the mounting surface of the ceramic toilet body to which the mounting part of the cover member is attached, allowing the hook-and-loop fastener on the mounting part of the cover member to be engaged.

JP 2010-190673 A (Patent No. 5465441 A)

Japan Institute of Invention and Innovation, Disclosure of Technical Information, No. 2019-501373

However, in the conventional flush toilet described in the above-mentioned Patent Document 1, if wastewater such as urination from the user or the toilet body accidentally gets onto a part of the upper surface of the toilet body and enters the gap between the toilet body and the cover member, the wastewater will adhere to and accumulate on the sponge attached to the inner surface of the front edge of the cover member when attached to the toilet body, causing odors and stains. In addition, if wastewater penetrates the attachment surface (adhesive surface) between the inner surface of the front edge of the cover member and the sponge, the sponge's function as a buffer is impaired, and the adhesive strength between the sponge and the cover member is weakened, causing the sponge itself to peel off from the cover member. In addition, there is a major premise that it is difficult to realize various considerations when using a ceramic toilet body with poor mechanical dimensional accuracy.
Furthermore, in the conventional flush toilet described in the above-mentioned Patent Document 2, a hook-and-loop fastener is adhered to the mounting surface (ceramic surface) of the ceramic toilet body to which the mounting part of the cover member is attached. For this reason, if sewage that has entered the gap between the toilet body and the cover member seeps into the adhesive surface between the mounting surface (ceramic surface) of the toilet body and the hook-and-loop fastener, the adhesive strength of the adhesive surface will weaken, creating the problem that the cover member may come off from the toilet body together with the hook-and-loop fastener.
Therefore, in recent years, a pressing issue has been how to effectively prevent the cover member from unintentionally detaching from the toilet body together with the fastening members such as hook-and-loop fasteners due to sewage seeping into the gap between the toilet body and the cover member.

The present invention was made to solve the problems of the prior art and the problems that have been required in recent years, and aims to provide a flush toilet that can effectively prevent the cover member from unintentionally coming off the toilet body together with the fixing member due to sewage that has entered the gap between the toilet body and the cover member.

In order to solve the above-mentioned problems, the present invention provides a flush toilet that is flushed with flushing water to discharge waste, comprising a toilet body having a bowl portion for receiving waste, a skirt portion provided on at least the front and both left and right sides of the outer periphery of the bowl portion, and a rear side wall portion provided behind the skirt portion, and a cover member attached to cover the side of the rear side wall portion of the toilet body, the rear side wall portion of the toilet body comprising a boundary wall portion forming a boundary wall surface on the rear end side of the skirt portion, and a guide wall portion that is provided on the rear side of the boundary wall portion and includes a mounting surface to which the mounting portion of the cover member is attached and that enables the mounting portion of the cover member to be guided to a fixed area of the mounting surface, a fixing member that fixes the mounting portion of the cover member to the fixed area of the mounting surface is adhered to the fixed area of the mounting surface, and the fixing member is positioned rearwardly away from the boundary wall surface so as to form a gap between it and the boundary wall surface.
In the present invention configured in this manner, with conventional flush toilets, for example, if sewage such as urination from the user or the toilet body accidentally gets onto part of the top surface of the toilet body, the sewage will seep into the gap between the toilet body and the cover member, and the sewage that comes into contact with the toilet body or cover member will run along the contact surfaces with the toilet body and cover member and adhere to the mounting part of the cover member or the attached surface of part of the toilet body, or to the fixing member that fixes the mounting part of the cover member to part of the toilet body.
In particular, in conventional flush toilets, if a member such as a hook-and-loop fastener that is adhered to the attachment surface with an adhesive or the like is used as a fixing member for fixing the mounting portion of the cover member to the fixed area of the attachment surface of the toilet body, there was a problem in that sewage could seep into the adhesive surface between the hook-and-loop fastener and the attachment surface, weakening the adhesive strength of the adhesive surface and causing the cover member to come off from the toilet body together with the hook-and-loop fastener.
Therefore, in the present invention, the guide wall portion of the rear side wall portion of the toilet body enables the mounting portion of the cover member to be guided to the fixed area of the mounting surface, and even if a fixing member for fixing the mounting portion of the cover member to the fixed area of the mounting surface is adhered to the fixed area of the mounting surface of this guide wall portion, a gap can be formed between the fixing member and the boundary wall surface by positioning this fixing member at a distance to the rear of the boundary wall surface of the boundary wall portion in the rear side wall portion of the toilet body.
As a result, even if sewage such as urination from the user or the toilet body accidentally gets onto part of the top surface of the toilet body and gets into the gap between the rear side wall of the toilet body and the cover member, the sewage that comes into contact with the toilet body or the cover member will flow down the gap between the boundary wall surface of the boundary wall part of the rear side wall of the toilet body and the fixing member of the mounting surface of the guide wall part.
Therefore, according to the present invention, it is possible to prevent sewage from adhering to the fixing member or from penetrating and adhering to the adhesive surface between the fixing member and the fixing area of the mounting surface of the guide wall portion, thereby effectively preventing the cover member from unintentionally detaching from the toilet body together with the fixing member.

In the present invention, preferably, the mounting surface of the guiding portion comprises a reference surface on which the fixing area is not provided, a fixing area surface on which the fixing area is provided, and a step portion formed so as to protrude this fixing area surface in an out-of-plane direction relative to the reference surface.
In the present invention configured in this manner, even if sewage such as urination from the user or the toilet body accidentally gets onto part of the upper surface of the toilet body and enters the gap between the rear side wall of the toilet body and the cover member, a step is formed that causes the fixed area surface of the mounting surface of the guide part to protrude outward from the reference plane, so that the sewage will not climb over the step but will flow down the gap between the boundary wall surface of the boundary wall part of the rear side wall of the toilet body and the fixed member of the mounting surface of the guide wall part.
In addition, the step portion provided between the reference surface of the mounting surface of the guide portion and the fixed area surface allows the adhesive surface between the fixed area surface and the fixing member to protrude in an out-of-plane direction beyond the reference surface, thereby effectively preventing sewage from penetrating and adhering to the adhesive surface between the fixed area surface and the fixing member.
Therefore, it is possible to more effectively prevent the cover member from unintentionally coming off from the toilet body together with the fixing member.

In the present invention, an upper end portion of the boundary wall surface is preferably provided further forward than a lower end portion of the boundary wall surface.
In the present invention configured in this manner, the upper end of the boundary wall surface of the boundary wall portion in the rear side wall portion of the toilet body is located forward of the lower end of the boundary wall surface, so that the boundary wall surface of the boundary wall portion in the rear side wall portion of the toilet body can be made to be an inclined surface that slopes downward from the front side and upper end side of the rear side wall portion of the toilet body toward the rear side and lower end side of the toilet body.
Therefore, in the unlikely event that sewage, such as urination from the user when urinating in an upright position in front of the toilet body, gets onto the upper end of the boundary wall surface of the rear side wall of the toilet body, the sewage can be made to flow smoothly down to the rear side and lower end side, without remaining near the upper end of the boundary wall surface, by running along the sloping surface that slopes downward from the front and upper end side of the boundary wall surface of the rear side wall of the toilet body.
This makes it possible to more effectively prevent sewage from penetrating and adhering to the adhesive surface between the fixed area of the mounting surface of the guide wall portion and the fixing member, thereby even more effectively preventing the cover member from unintentionally detaching from the toilet body together with the fixing member.
On the other hand, although this is not adopted in the present invention, if the upper end of the boundary wall surface of the rear side wall portion of the toilet body is located rearward of the lower end of the boundary wall surface, the boundary wall surface of the boundary wall portion of the rear side wall portion of the toilet body will become an inclined surface that slopes downward from the rear side and upper end side of the rear side wall portion of the toilet body toward the front side and lower end side.
As a result, the mounting surface of the guide wall provided on the rear side from the inside of the boundary wall and the fixing member fixed to the fixing area of the mounting surface are located below the downwardly sloping inclined surface of the boundary wall. Therefore, part of the sewage flowing down along the inclined surface to the front side and the lower end side falls onto the mounting surface or the fixing member facing below the inclined surface, increasing the risk that the sewage will penetrate from an unexpected direction and adhere to the adhesive surface between the fixing member and the fixing area of the mounting surface of the guide wall.
Therefore, according to the present invention, by providing the upper end portion of the boundary wall surface of the boundary wall portion of the rear side wall portion of the toilet body further forward than the lower end portion of the boundary wall surface, it is possible to prevent sewage from entering from an unexpected direction into the adhesive surface between the fixing member and the fixing area of the mounting surface of the guide wall portion, and it is possible to effectively prevent the cover member from unintentionally detaching from the toilet body together with the fixing member.

In the present invention, it is preferable that the toilet further has a private part sanitary washing device that enables the private parts of the user to be washed, and this private part sanitary washing device has a housing that is provided on the upper surface of the toilet body rearward of the bowl portion and incorporates a functional portion, and the front-to-rear position of the front lower end of this housing is arranged in a position approximately identical to the front-to-rear position of the upper end of the boundary wall portion on the rear side wall portion of the toilet body to which the front upper end of the cover member is attached.
In the present invention configured in this manner, a housing incorporating the functional parts of the private sanitary washing device that enables the private parts of the user to be washed is provided on the upper surface of the toilet body rearward of the bowl portion, and the fore-and-aft position of the front lower end of this housing is located in a position approximately identical to the fore-and-aft position of the upper end of the boundary wall portion in the rear side wall portion of the toilet body to which the front upper end of the cover member is attached.
As a result, in the unlikely event that wastewater such as urination from the user when urinating in an upright position in front of the toilet body splashes onto the upper part of the housing of the private hygiene cleaning device and flows down to the front lower end of the housing, this wastewater can be made to flow downward along the boundary wall surface from the upper end of the boundary wall in the rear side wall of the toilet body, which is located in approximately the same fore-aft position as the front lower end of the housing.
Therefore, it is possible to effectively prevent wastewater from the sanitary washing device from entering from an unexpected direction into the adhesive surface between the fixing member and the fixing area of the mounting surface of the guide wall portion, and it is therefore possible to more effectively prevent the cover member from unintentionally coming off the toilet body together with the fixing member.

In the present invention, the boundary wall surface of the boundary wall portion in the rear side wall portion of the toilet body is preferably provided across from the upper end to the lower end of the toilet body.
In the present invention configured in this manner, even if sewage such as urination that splashes on the upper end of the rear side wall of the toilet body finds its way into the gap between the rear side wall of the toilet body and the cover member and then splashes onto the boundary wall surface of the boundary wall portion, because this boundary wall surface is provided from the upper end to the lower end of the toilet body, the sewage flowing down along the boundary wall surface can be prevented from stagnating halfway between the upper and lower ends of the toilet body, and can be allowed to flow smoothly down to the lower end of the toilet body.
In addition, by having the sewage flowing down along the boundary wall surface stagnate halfway between the upper and lower ends of the toilet body, it is possible to more effectively prevent the sewage from entering the adhesive surface between the fixing member and the fixed area of the mounting surface of the guide wall portion from an unexpected direction, and it is even more effective to prevent the cover member from unintentionally detaching from the toilet body together with the fixing member.
Furthermore, after the sewage flows down the boundary wall surface, it seeps out from the lower end of the toilet body, making it possible to quickly detect the seepage of sewage, thereby improving cleanability.

In the present invention, preferably, the step portion comprises a vertical wall portion formed so as to extend longitudinally from the upper and front side of the mounting surface to the lower and rear side, and a horizontal wall portion extending in the width direction of the mounting surface, and the vertical width dimension (L1) of the vertical wall portion is set to be larger than the width dimension (L2) of the horizontal wall portion.
In the present invention configured in this manner, in the unlikely event that the upper surface of the toilet body above the step portion on the mounting surface of the guide wall portion becomes wet with sewage, etc., and the sewage gets onto the upper end of the horizontal wall portion of the step portion, etc., the vertical width dimension (L1) of the vertical wall portion of the step portion is set to be larger than the horizontal width dimension (L2) of the horizontal wall portion (L1 > L2), so the sewage will not remain near the upper end of the step portion (horizontal wall portion, etc.) but will tend to flow in the horizontal direction along the horizontal wall portion of the step portion and then tend to flow down along the vertical wall portion of the step portion.
Therefore, sewage that has flowed in near the upper end of the step portion can be made to flow smoothly down the gap between the boundary wall surface of the boundary wall portion of the rear side wall portion of the toilet body and the fixing member of the mounting surface of the guide wall portion.
This prevents sewage from stagnating halfway between the upper and lower ends of the toilet body and allows it to flow smoothly down to the lower end of the toilet body, thereby more effectively preventing sewage from entering the adhesive surface between the fixing member and the fixed area surface of the mounting surface of the guide wall portion from an unexpected direction and even more effectively preventing the cover member from unintentionally detaching from the toilet body together with the fixing member.

The flush toilet of the present invention can effectively prevent the cover member from unintentionally coming off the toilet body together with the fixing member due to sewage that has entered the gap between the toilet body and the cover member.

FIG. 1 is a side view of a flush toilet according to an embodiment of the present invention. FIG. 1 is an exploded perspective view of a flush toilet according to an embodiment of the present invention, seen diagonally from behind and above. FIG. 2 is an exploded plan view of the rear side wall portion and cover member of the toilet body of the flush toilet according to the first embodiment of the present invention. FIG. 3 is a partially enlarged perspective view showing an enlarged view of the boundary wall portion and guide wall portion in the rear side wall portion of the toilet body of the flush toilet according to the embodiment of the present invention shown in FIG. 2. FIG. 2 is a partially enlarged side view of the side view of the flush toilet according to one embodiment of the present invention shown in FIG. 1, in which a portion of the cover member has been broken away to show the rear side wall portion of the toilet body to which the front mounting portion of the cover member is attached. FIG. 6 is a partially enlarged side view showing the guide wall portion and its hook-and-loop fastener portion in the rear side wall portion of the toilet body of the flush toilet according to the embodiment of the present invention shown in FIG. 5 . FIG. 2 is a partially enlarged perspective view, viewed diagonally from above, of the boundary wall portion and guide wall portion in the rear side wall portion of the toilet body of a flush toilet according to an embodiment of the present invention. 8 is a vertical cross-sectional view taken along line VIII-VIII in FIG. 5. FIG. 7 is a plan sectional perspective view taken along line IX-IX in FIG. 6. FIG. 7 is a planar cross-sectional perspective view taken along line XX in FIG. 6.

A flush toilet according to one embodiment of the present invention will now be described with reference to the accompanying drawings.
First, Figure 1 is a side view of a flush toilet according to one embodiment of the present invention, and an exploded perspective view of the flush toilet according to one embodiment of the present invention, seen diagonally from behind and above.
As shown in Figures 1 and 2, a flush toilet 1 according to one embodiment of the present invention comprises a ceramic toilet body 2, a tank apparatus 4 provided to the rear of it, and a pair of cover members 6 that are removably attached to the toilet body 2 and cover both the left and right sides of the tank apparatus 4.
In FIG. 2, only the cover member 6 on one side is shown, and the cover member on the other side is not shown.

Next, as shown in FIG. 2, the toilet body 2 comprises a bowl portion 8 for receiving waste, a rim portion 10 formed on the upper edge of the bowl portion 8, a drain trap portion (not shown) extending from the bottom of the bowl portion 8 to drain waste from within the bowl portion 8, and skirt portions 12 provided on the outer periphery in front and on both the left and right sides of the bowl portion 8 and the drain trap portion (not shown).

Furthermore, as shown in Figures 1 and 2, the flush toilet 1 is equipped with a genital sanitary washing device 14 that is provided on the upper surface of the rim portion 10 rearward of the bowl portion 8 and skirt portion 12 of the toilet body 2 and enables the user's genitals to be washed.
Furthermore, as shown in Figures 1 and 2, the tank device 4 is equipped with a water storage tank 16 that stores flushing water supplied from a water supply source (not shown) such as a water tap, a tank water supply section 18 provided on the top of the water storage tank 16 that supplies flushing water into the water storage tank 16, and a pump 20 that pressure-feeds the flushing water in the water storage tank 16 to the toilet body 2.
In addition, the private sanitary washing device 14 is disposed forward of the tank water supply section 18 above the water storage tank 16 of the tank device 4.

In this embodiment, the tank device 4 is described as being in a form in which flushing water in the water storage tank 16 can be supplied to the toilet body 2 by utilizing the auxiliary pressure of the pump 20, but this is not limited to this form and other forms can also be applied.
For example, a so-called gravity-fed water storage tank may be adopted, in which flush water stored in the tank is supplied to the toilet body 2 using gravity, or a direct water pressure type or flush valve type may be adopted, in which the water supply pressure of tap water is directly utilized.

Next, FIG. 3 is an exploded plan view of the rear side wall portion and cover member of the toilet body of the flush toilet according to the first embodiment of the present invention.
2 and 3, the toilet body 2 further includes a rear side wall portion 22 provided behind the skirt portion 12. The rear side wall portion 22 includes a boundary wall portion 24 and a guide wall portion 26.
2. FIG. 4 is a partially enlarged perspective view showing the boundary wall and guide wall portions in the rear side wall of the toilet body of the flush toilet according to the embodiment of the present invention shown in FIG.
As shown in FIGS. 3 and 4 , the boundary wall 24 of the rear side wall 22 of the toilet body 2 is provided on the rear end side of the skirt portion 12 and forms a boundary surface (boundary wall surface 28 ) with the skirt portion 12 .
3 and 4, the guide wall 26 of the toilet body 2 is provided on the rear side of the boundary wall 24 and forms an attachment surface 30 to which the cover member 6 is attached. Here, the attachment surface 30 is provided approximately parallel to the side surface S0 of the tank device 4 (see FIG. 3).
In addition, the mounting portion 32 of the cover member 6 has a front mounting portion 32a and a rear mounting portion 32b on its front and rear sides, respectively, and the mounting surface 30 of the guide wall portion 26 of the toilet body 2 is configured to guide the mounting surface 32c of the front mounting portion 32a of the mounting portion 32 of the cover member 6 to the fixed area A1 of the mounting surface 30.
Incidentally, the rear mounting portion 32 b of the mounting portion 32 of the cover member 6 is adapted to be detachably mounted to the rear mounting portion 4 a provided on the rear side of the tank device 4 .

As shown in Figs. 1 and 2, a front edge 6a of the cover member 6 extends obliquely downward from the front and upper side to the rear and lower side.
As shown in Figures 2 and 3, the front mounting portion 32a of the cover member 6 has a plurality of (three) hook-and-loop fasteners 34 provided on the back surface (mounting surface 32c) of the front mounting portion 32a of the cover member 6.
These hook-and-loop fasteners 34 are arranged approximately parallel to the front-to-rear direction with respect to the front edge portion 6a, which extends at a downward angle from the front and upper side of the cover member 6 to the rear and lower side, and adjacent hook-and-loop fasteners 34 are arranged at a predetermined distance from each other.
Furthermore, as shown in Figures 3 and 4, a fixing member (hook-and-loop fastener 36) that fixes the hook-and-loop fastener 34 on the mounting surface 32c of the front mounting portion 32a of the cover member 6 to the fixing area A1 of the mounting surface 30 on the guide wall portion 26 of the toilet body 2 is adhered by adhesive or the like to the mounting area A1 of the mounting surface 30.
Here, one of the hook-and-loop fasteners 34, 36 is a male fastener member and the other is a female fastener member, and the hook-and-loop fasteners 34, 36 are bonded to each other so that they can be fixed.

Next, Figure 5 is a partially enlarged side view of the side view of the flush toilet 1 according to one embodiment of the present invention shown in Figure 1, in which a portion of the cover member 6 has been broken away to allow the rear side wall portion 22 of the toilet body 2 to which the front mounting portion 32 of the cover member 6 is attached to be visible.
First, as shown in FIGS. 4 and 5 , in the boundary wall portion 24 of the rear side wall portion 22 of the toilet body 2, the upper end portion 28a of the boundary wall surface 28 is provided further forward than the lower end portion 28b of the boundary wall surface 28.
As shown in Figures 4 and 5, the boundary wall surface 28 is provided from the upper end portion 22a of the rear side wall portion 22 of the toilet body 2 (the upper surface 10a of the rear rim portion 10) to the lower end portion 22b of the rear side wall portion 22.

Next, as shown in Figures 2 to 5, the sanitary washing device 14 is provided on the upper surface 10a of the rim portion 10 rearward of the bowl portion 8 of the toilet body 2 and has a housing 14b incorporating a functional portion 14a.
As shown in FIG. 5, the upper surface of the housing 14b of the pubic sanitary washing device 14 has a portion that forms an inclined surface 14c that slopes downward from the rear side to the front side.
Furthermore, as shown in Figures 1 and 5, the front-to-rear position P1 of the front lower end 14d of the housing 14b of the local sanitary washing device 14 is positioned at approximately the same position as the front-to-rear position P2 of the upper end 28a of the boundary wall surface 28 at the boundary wall portion 24 of the toilet body 2 to which the front upper end 6b of the cover member 6 is attached.

Next, Fig. 6 is a partially enlarged side view showing the mounting surface 30 of the guide wall 26 and its hook-and-loop fastener 36 in the rear sidewall 22 of the toilet body 2 of the flush toilet 1 according to one embodiment of the present invention shown in Fig. 5. Also, Fig. 7 is a partially enlarged perspective view of the boundary wall 24 and guide wall 26 in the rear sidewall 22 of the toilet body 2 of the flush toilet 1 according to one embodiment of the present invention, viewed obliquely from above. Furthermore, Fig. 8 is a vertical cross-sectional view taken along line VIII-VIII in Fig. 5. Also, Fig. 9 is a planar cross-sectional perspective view taken along line IX-IX in Fig. 6. Furthermore, Fig. 10 is a planar cross-sectional perspective view taken along line X-X in Fig. 6.
As shown in Figures 5 to 7, the hook-and-loop fastener 36 adhered to the fixed area A1 of the mounting surface 30 of the guide wall portion 26 of the toilet body 2 is positioned rearward and spaced apart from the boundary wall surface 28 of the boundary wall portion 24 of the rear side wall portion 22 of the toilet body 2.
As a result, a gap G1 is formed between the boundary wall surface 28 of the boundary wall portion 24 in the rear side wall portion 22 of the toilet body 2 and the front end surface 36a of the hook-and-loop fastener 36 on the mounting surface 30 of the guide wall portion 26 (see Figures 5 and 6).

Next, as shown in Figures 7 to 10, the mounting surface 30 of the guide wall portion 26 on the rear side wall portion 22 of the toilet body 2 comprises a reference surface 30a where no fixing area A1 is provided, a fixing area surface 30b where the fixing area A1 is provided, and a step portion G2 formed so as to protrude this fixing area surface 30b in an out-of-plane direction (in the direction of the surface normal vector N) relative to the reference surface 30a.
That is, as shown in FIG. 10, the hook-and-loop fastener 36 is not adhered to the reference surface 30a of the mounting surface 30 of the guiding wall portion 26 where the fixing area A1 is not provided.
On the other hand, as shown in FIGS. 7 to 9, the hook-and-loop fastener 36 is adhered only onto the fixing area surface 30 b of the mounting surface 30 of the guide wall portion 26 .
9, the adhesive surface C1 between the fixing area surface 30b and the hook-and-loop fastener 36 is disposed outwardly of the reference surface 30a (outwardly in the horizontal left-right direction) due to the step portion G2. Furthermore, as shown in Figs. 6 and 8, the step portion G2 includes a vertical wall portion 30c formed so as to extend in the longitudinal direction from the upper and front side of the attachment surface 30 toward the lower and rear side, and a horizontal wall portion 30d extending in the lateral width direction of the attachment surface 30.
Moreover, the vertical width dimension L1 of the vertical wall portion 30c in FIG. 6 is set to be larger than the horizontal width dimension L2 of the horizontal wall portion (L1>L2).

Next, the operation of the flush toilet 1 according to the embodiment of the present invention described above will be explained with reference to FIGS.
First, according to the flush toilet 1 of one embodiment of the present invention, with conventional flush toilets, if sewage, such as urination from the user's side or the toilet body side, accidentally gets onto part of the top surface of the toilet body, the sewage will seep into the gap between the toilet body and the cover member, and the sewage that comes into contact with the toilet body or cover member will run along the contact surfaces with the toilet body and cover member and adhere to the mounting part of the cover member or the attached surface of part of the toilet body, or adhere to the fixing member that fixes the mounting part of the cover member to part of the toilet body.
In particular, in conventional flush toilets, if a member such as a hook-and-loop fastener that is adhered to the attachment surface with an adhesive or the like is used as a fixing member for fixing the mounting portion of the cover member to the fixed area of the attachment surface of the toilet body, there was a problem in that sewage could seep into the adhesive surface between the hook-and-loop fastener and the attachment surface, weakening the adhesive strength of the adhesive surface and causing the cover member to come off from the toilet body together with the hook-and-loop fastener.
Therefore, in the flush toilet 1 of this embodiment, the guide wall portion 26 of the rear side wall portion 22 of the toilet body 2 enables the front mounting portion 32a of the cover member 6 to be guided to the fixed area A1 of the mounting surface 30, and even though a hook-and-loop fastener 36 that fixes the hook-and-loop fastener 34 of the front mounting portion 32a of the cover member 6 to the fixed area A1 of the mounting surface 30 is adhered to the guide wall portion 26 in the fixed area A1 of the mounting surface 30, by positioning this hook-and-loop fastener 36 at a distance to the rear of the boundary wall surface of the boundary wall portion 24, a gap G1 can be formed between the boundary wall surface 28.
As a result, even if sewage W, such as urination from the user's side at the front of the toilet body 2 or from the toilet body 2 side, accidentally splashes onto part of the upper surface of the toilet body 2 and gets into the gap between the rear side wall portion 22 of the toilet body 2 and the cover member 6, the sewage W that comes into contact with the toilet body 2 or the cover member 6 will flow down the gap G1 between the boundary wall surface 28 of the boundary wall portion 24 of the rear side wall portion 22 of the toilet body 2 and the hook-and-loop fastener 36 on the mounting surface 30 of the guide wall portion 26 (see Figures 6 and 7).
Therefore, it is possible to prevent sewage W from adhering to the hook-and-loop fastener 36 of the guide wall portion 26 of the rear side wall portion 22 of the toilet body 2 or the hook-and-loop fastener 34 on the mounting surface 32c of the front mounting portion 32a of the cover member 6 attached thereto.
In addition, since it is possible to prevent sewage W from penetrating and adhering to the adhesive surface C1 (see Figures 7 to 9) between the fixed area A1 of the mounting surface 30 of the guide wall portion 26 and the hook-and-loop fastener 36, it is possible to effectively prevent the cover member 6, together with the hook-and-loop fasteners 34, 36, from unintentionally detaching from the toilet body.

Next, with the flush toilet 1 of this embodiment, in the unlikely event that sewage W, such as urination, from the user's side or the toilet body 2 side accidentally splashes onto part of the upper surface of the toilet body 2 and gets into the gap between the rear side wall portion 22 of the toilet body 2 and the cover member 6, a step portion G2 is formed that causes the fixed area surface 30b of the mounting surface 30 of the guide wall portion 26 to protrude out-of-plane (in the direction of the surface normal vector N) relative to the reference plane 30a (see Figures 7 to 9).
This allows the sewage W to flow down the gap G1 between the boundary wall surface 28 of the boundary wall portion 24 of the rear side wall portion 22 of the toilet body 2 and the hook-and-loop fastener 36 on the mounting surface 30 of the guide wall portion 26 without climbing over the step portion G2 (see Figures 6 and 7).
In addition, the step portion G2 provided between the reference surface 30a and the fixed area surface 30b of the mounting surface 30 in the guide wall portion 26 of the rear side wall portion 22 of the toilet body 2 allows the adhesive surface C1 between the fixed area surface 30b of the mounting surface 30 of the guide wall portion 26 and the hook-and-loop fastener 36 to protrude out-of-plane (in the direction of the surface normal vector N) beyond the reference surface 30a, effectively preventing sewage W from penetrating and adhering to the adhesive surface C1 (see Figures 7 to 9).
Therefore, it is possible to more effectively prevent the cover member 6 from unintentionally coming off from the toilet body 2 together with the hook-and-loop fasteners 34, 36.

Furthermore, with the flush toilet 1 of this embodiment, the upper end 28a of the boundary wall surface 28 of the boundary wall section 24 in the rear sidewall section 22 of the toilet body 2 is located further forward than the lower end 28b of the boundary wall surface 28 .
This allows the boundary wall surface 28 of the boundary wall portion 24 in the rear side wall portion 22 of the toilet body 2 to be an inclined surface that slopes downward from the front side and upper end side of the rear side wall portion 22 of the toilet body 2 to the rear side and lower end side.
Therefore, for example, in the unlikely event that, as shown in Figure 7, sewage W, such as urination from the user when urinating in an upright position in front of the toilet body 2, splashes onto the upper end 28a of the boundary wall surface 28 of the rear side wall portion 22 of the toilet body 2, the sewage W can be made to flow smoothly downward to the rear side and lower end side without remaining near the upper end 28a of the boundary wall surface 28, while traveling along the inclined surface S1 (see Figures 6 and 7) that slopes downward from the front side and upper end 28a of the boundary wall surface 28 of the rear side wall portion 22 of the toilet body 2.
Therefore, it is possible to more effectively prevent sewage W from penetrating and adhering to the adhesive surface C1 between the fixed area A1 of the mounting surface 30 of the guide wall portion 26 and the hook-and-loop fastener 36, thereby even more effectively preventing the cover member 6, together with the hook-and-loop fasteners 34, 36, from unintentionally detaching from the toilet body 2.
On the other hand, although this is not adopted in the present embodiment, if the upper end of the boundary wall surface 28 of the rear side wall portion 22 of the toilet body 2 were located rearward of the lower end of the boundary wall surface 28, the boundary wall surface of the boundary wall portion 24 of the rear side wall portion 22 of the toilet body 2 would become an inclined surface that slopes downward from the rear side and upper end side of the rear side wall portion 22 of the toilet body 2 toward the front side and lower end side.
As a result, the mounting surface 30 of the guide wall portion 26 provided on the rear side from the inside of the boundary wall portion 24, and the hook-and-loop fastener 36 fixed to the fixing area A1 of the mounting surface 30, are located below the downwardly sloping inclined surface S1 of the boundary wall surface 28. This increases the risk that part of the sewage W flowing down along the inclined surface S1 to the front side and the lower end side will fall onto the mounting surface 30 or the hook-and-loop fastener 36 facing below the inclined surface S1, and that the sewage W will infiltrate from an unexpected direction and adhere to the adhesive surface C1 between the hook-and-loop fastener 36 and the fixing area A1 of the mounting surface 30 of the guide wall portion 26.
Therefore, in this embodiment, the upper end 28a of the boundary wall surface 28 of the boundary wall portion 24 of the rear side wall portion 22 of the toilet body 2 is provided further forward than the lower end 28b of the boundary wall surface 28. This makes it possible to prevent sewage W from entering from an unexpected direction into the adhesive surface C1 between the hook-and-loop fastener 36 and the fixing area A1 of the mounting surface 30 of the guide wall portion 26, and effectively prevents the cover member 6, together with the hook-and-loop fasteners 34, 36, from unintentionally coming off from the toilet body 2.

Furthermore, according to the flush toilet 1 of this embodiment, a housing 14b containing a functional part 14a of the private parts sanitary washing device 14 that enables the private parts of the user to be washed is provided on the upper surface 10a of the rim part 10 rearward of the bowl part 8 of the toilet body 2.
In addition, the front-to-rear position P1 of the front lower end 14d of this housing 14b is positioned at approximately the same position as the front-to-rear position P2 of the upper end 28a of the boundary wall surface 28 at the boundary wall portion 24 of the toilet body 2 to which the front upper end 6b of the cover member 6 is attached.
As a result, in the unlikely event that, for example, as shown in Figure 5, sewage W such as urination from the user when urinating in an upright position in front of the toilet body 2 falls on the upper part of the upper surface (inclined surface 14c) of the housing 14b of the local sanitary washing device 14 and flows down to the front lower end 14d of the housing 14b, this sewage W can be made to flow downward along the boundary wall surface 28 from the upper end 28a of the boundary wall surface 28 of the boundary wall portion 24 in the rear side wall portion 22 of the toilet body 2, which is located at a fore-aft position P1 that is approximately the same as the fore-aft position of the front lower end 14d of the housing 14b.
Therefore, it is possible to effectively prevent wastewater W from the local sanitary washing device 14 from entering the adhesive surface C1 between the hook-and-loop fastener 36 and the fixed area A1 of the mounting surface 30 of the guide wall portion 26 from an unexpected direction.
Therefore, it is possible to more effectively prevent the cover member 6 from unintentionally coming off from the toilet body 2 together with the hook-and-loop fasteners 34, 36.

Furthermore, with the flush toilet 1 of this embodiment, as shown in Figures 4 to 7, in the unlikely event that sewage W, such as urination, splashes on the upper end 22a of the rear side wall 22 of the toilet body 2, seeps into the gap between the rear side wall 22 of the toilet body 2 and the cover member 6, and then splashes onto the boundary wall surface 28 of the boundary wall portion 24, this boundary wall surface 28 is provided spanning from the upper end 22a to the lower end 22b of the rear side wall 22 of the toilet body 2.
Therefore, the sewage W flowing down along the boundary wall surface 28 can be prevented from stagnating halfway between the upper end 22a and the lower end 22b of the rear side wall portion 22 of the toilet body 2, and can be allowed to flow smoothly down to the lower end 22b of the rear side wall portion 22 of the toilet body 2.
In addition, by causing the sewage W flowing down along the boundary wall surface 28 to stagnate halfway between the upper end 22a and the lower end 22b of the rear side wall portion 22 of the toilet body 2, the sewage W can be more effectively prevented from entering the adhesive surface C1 between the hook-and-loop fastener 36 and the fixed area A1 of the mounting surface 30 of the guide wall portion 26 from an unexpected direction, and this can even more effectively prevent the cover member 6, together with the hook-and-loop fasteners 34, 36, from unintentionally coming off the toilet body 2.
Furthermore, after the sewage W flows down the boundary wall surface 28, it seeps out from the lower end portion 22b of the rear side wall portion 22 of the toilet body 2, so that the seepage of the sewage W can be detected early, thereby improving cleaning performance.

Furthermore, with the flush toilet 1 of this embodiment, in the unlikely event that the top surface of the toilet body 2 above the step G2 between the inner end 28c of the boundary wall surface 28 and the mounting surface 30 of the guide wall portion 26 becomes covered with sewage or the like, and the sewage then splashes onto the area near the upper end of the step G2, as shown in Figures 6, 8 and 9, the vertical width dimension L1 of the vertical wall portion 30c of the step G2 is set to be greater than the horizontal width dimension L2 of the horizontal wall portion 30d of the step G2 (L1 > L2).
This allows the wastewater W1 to flow more easily in the width direction along the horizontal wall portion 30d of the step portion G2 without stagnating near the upper end of the step portion G2 (such as the horizontal wall portion 30d), and then more easily flow down along the vertical wall portion 30c of the step portion G2.
Therefore, the sewage W1 that flows into the vicinity of the upper end of the step portion G2 can be made to flow smoothly down the gap G1 between the boundary wall surface 28 of the boundary wall portion 24 of the rear side wall portion 22 of the toilet body 2 and the hook-and-loop fastener 36 on the mounting surface 30 of the guide wall portion 26.
This prevents the wastewater W1 from stagnating halfway between the upper end 22a and the lower end 22b of the rear side wall portion 22 of the toilet body 2, and allows it to flow smoothly down to the lower end 22b of the toilet body 2.
Therefore, it is possible to more effectively prevent sewage W from entering from an unexpected direction into the adhesive surface C1 between the hook-and-loop fastener 36 and the fixed area surface 30b of the mounting surface 30 of the guide wall portion 26, and it is even more effective to prevent the cover member 6, together with the hook-and-loop fasteners 34, 36, from unintentionally coming off from the toilet body 2.

In this embodiment, hook-and-loop fasteners 34, 36 are used as fixing members for fixing the front mounting portion 32 of the cover member 6 to the fixing area A1 of the mounting surface 30 in the guide wall portion 26 of the rear side wall portion 22 of the toilet body 2, and a configuration has been described in which one is a male fastener member and the other is a female fastener member.
However, the fixing member may be in a form other than a hook-and-loop fastener, for example, a magnet or the like.
Furthermore, the number of each of the multiple hook-and-loop fasteners 34, 36 is not limited to three, but may be set to a number other than three.

1 Flush toilet according to one embodiment of the present invention 2 Toilet body 4 Tank device 4a Rear attachment portion 6 Cover member 6a Front edge portion of cover member 6b Front upper end portion of cover member 8 Bowl portion of toilet body 10 Rim portion of toilet body 10a Upper surface of rear rim portion 12 Skirt portion of toilet body 14 Private part sanitary washing device 14a Functional portion 14b Housing 14c Inclined surface of upper surface of housing 14d Front lower end portion of housing 16 Water storage tank 18 Tank water supply portion 20 Pump 22 Rear side wall portion of toilet body 22a Upper end portion of rear side wall portion of toilet body 22b Lower end portion of rear side wall portion of toilet body 24 Boundary wall portion of rear side wall portion of toilet body 26 Guide wall portion of rear side wall portion of toilet body 28 Boundary wall surface of boundary wall part of rear side wall part of toilet body 28a Upper end part of boundary wall surface 28b Lower end part of boundary wall surface 28c Inner end part of boundary wall surface 30 Mounting surface of guide wall part of rear side wall part of toilet body 30a Reference surface 30b Fixed area surface 30c Vertical wall part of step part 30d Horizontal wall part of step part 32 Mounting part of cover member 32a Front mounting part of cover member 32b Rear mounting part of cover member 32c Mounting surface of front mounting part of cover member 34 Hook and loop fastener (mounting part of cover member)
36 hook-and-loop fastener (fixing member)
36a Front end face of the hook-and-loop fastener A1 Fixing area C1 Adhesion surface between the fixing area of the mounting surface of the guide wall portion and the hook-and-loop fastener L1 Vertical width dimension of the vertical wall portion of the step portion L2 Horizontal width dimension of the horizontal wall portion of the step portion N Surface normal vector of the mounting surface G1 Gap between the boundary wall surface of the boundary wall portion and the front end face of the hook-and-loop fastener of the mounting surface of the guide wall portion G2 Step portion P1 Front-to-rear position of the front lower end of the housing of the sanitary washing device P2 Front-to-rear position of the upper end of the boundary wall surface of the boundary wall portion of the toilet body S0 Side of the tank device S1 Inclined surface W Wastewater such as urination

Claims (7)

A flush toilet that is flushed with flush water to expel waste,
a toilet body including a bowl portion for receiving waste, a skirt portion provided on at least the front and both left and right outer peripheries of the bowl portion, and a rear side wall portion provided behind the skirt portion;
A cover member is attached to cover the side of the rear side wall of the toilet body,
The rear side wall of the toilet body includes a boundary wall portion that forms a boundary wall surface on the rear end side of the skirt portion, and a guide wall portion provided on the rear side of the boundary wall portion,
the guide wall portion includes an attachment surface formed on a side surface thereof, a fixing area provided on the attachment surface, and a first fixing member adhered to the fixing area;
the cover member includes an attachment portion attached to the attachment surface, and a second fixing member provided on the attachment surface of the attachment portion and capable of being adhesively fixed to the first fixing member,
the guide wall portion is configured to guide the mounting surface to the fixing region on the mounting surface by bonding the first fixing member and the second fixing member to each other when the mounting portion of the cover member is attached to the mounting surface,
the first fixing member is disposed rearwardly and spaced apart from the boundary wall surface so as to form a gap between the first fixing member and the boundary wall surface,
The mounting surface of the guide wall portion includes a reference surface on which the fixing area is not provided, a fixing area surface on which the fixing area is provided, and a step portion formed so as to project the fixing area surface in an out-of-plane direction relative to the reference surface,
A flush toilet wherein the reference surface is formed flat along the longitudinal direction of the mounting surface. The flush toilet according to claim 1, wherein the upper end of the boundary wall is located forward of the lower end of the boundary wall. The flush toilet according to claim 1 or 2 further comprises a genital sanitary washing device that enables the user's genitals to be washed, the genital sanitary washing device is provided on the upper surface of the toilet body rearward of the bowl portion and has a housing that houses a functional portion, and the front-to-rear position of the front-side lower end of the housing is located in approximately the same position as the front-to-rear position of the upper end of the boundary wall portion of the rear side wall portion of the toilet body to which the front-side upper end of the cover member is attached. A flush toilet according to any one of claims 1 to 3, in which the boundary wall surface of the boundary wall portion in the rear side wall portion of the toilet body is provided from the upper end to the lower end of the toilet body. The flush toilet according to claim 1, wherein the step portion comprises a vertical wall portion that extends longitudinally from the upper and front side of the mounting surface toward the lower and rear side, and a horizontal wall portion that extends in the width direction of the mounting surface, and the vertical width dimension (L1) of the vertical wall portion is set to be larger than the width dimension (L2) of the horizontal wall portion. The flush toilet according to claim 1, wherein the fixing area surface comprises a plurality of fixing area surfaces spaced apart along the longitudinal direction of the mounting surface, and the reference surface is provided between the plurality of fixing area surfaces and is formed flat along the longitudinal direction of the mounting surface. The flush toilet of claim 6, wherein the multiple fixing area surfaces each include a first fixing area surface, a second fixing area surface, and a third fixing area surface, which are provided at three locations spaced apart along the longitudinal direction of the mounting surface, and the reference surface includes a first reference surface provided in an area between the first fixing area surface and the second fixing area surface , and a second reference surface provided in an area between the second fixing area surface and the third fixing area surface, and each of the first reference surface and the second reference surface is formed flat along the longitudinal direction of the mounting surface.

Images