JP6921379B2 - Toilet bowl device - Google Patents

Description

The present invention relates to a flush urinal, and more particularly to a flush urinal that is washed with wash water supplied from a wash water source and discharges filth.

Conventionally, as a flush urinal, a first rim spout is formed in a rim portion slightly rearward of the lateral central portion of the bowl portion, and a second rim spout is provided in the rim portion on the rear side of the bowl portion. It is known that wash water is discharged from each of the first rim spout and the second rim spout (see, for example, Patent Document 1).
In this type of flush toilet, the rear end of the bowl, to which stool is most likely to adhere, can be washed with wash water spouted from the second spout.

Japanese Unexamined Patent Publication No. 2015-196960

In the above-mentioned flush toilet, for example, when the flow rate of water discharged for water saving is reduced, there is a concern that the water force of the wash water discharged from the spout may be reduced. If the spout is located on the rear side of the bowl and the wash water discharged from the spout is small, the rear end of the bowl is washed, but the wash water that has passed through the rear end of the bowl is forward. There is a concern that the front end of the bowl cannot be reached, or even if it reaches, the water force is weak and the front end cannot be completely turned. Further, for example, when the number of spouts on the entire circumference of the rim portion is one instead of a plurality and the spouts are arranged on the rear side of the bowl portion, the bowl is filled with only the washing water discharged from the one spout. The front end must be swiveled while passing through the rear end of the portion, and depending on the flow rate of the flush water discharged, the front end of the bowl portion cannot be reached, or even if it is reached, the water force is weak and the front end is swiveled. There are concerns that cannot be overwhelmed.
If the front end of the bowl portion cannot be reached, or if the water force is weak and the front end cannot be completely swiveled even if the bowl portion is reached, that is, if the swivelability is reduced, there is a concern that the cleanability on the front side of the bowl portion may be reduced.

The present invention has been made to solve the above-mentioned problems, and it is possible to improve the cleanability of the rear region in the bowl portion to which dirt easily adheres and to suppress the deterioration of the swivelability. The purpose is to provide a clean flush toilet.

The present invention is a flush toilet that is washed by washing water supplied from a washing water source and discharges filth, and has a bowl-shaped filth receiving surface and a rim portion formed on the upper edge of the filth receiving surface. A bowl portion provided with, a drainage channel connected below the bowl portion to discharge filth, and a rim water discharge portion provided in the rim portion to discharge washing water into the bowl portion to form a swirling flow. The bowl portion is further formed between the upper edge portion of the filth receiving surface and the lower end portion of the rim portion in the circumferential direction from the rim water discharge portion, and water is discharged from the rim water discharge portion. It is provided with a shelf portion that guides the cleaning water in the circumferential direction, and the rim water discharge portion is provided on either the left or right rim portion of the rear side region of the bowl portion to supply the cleaning water to the rear end in the bowl portion. A single rim spout is formed to discharge water toward the front area of the bowl after passing through, and the width of the shelf is set to increase from the rear of the bowl to the side. It is a toilet bowl.

In the present invention configured as described above, the washing water discharged rearward from the rim spout of the rim spouting portion provided on either the left or right rim portion of the rear side region of the bowl portion is along the shelf portion. A flow (swirl flow) is formed in which the bowl portion is guided in the circumferential direction and swirls. At this time, since the width of the shelf is set to increase from the rear of the bowl to the side, the washing water discharged from the rim spout toward the rear end is sent to the shelf behind the bowl. When approaching, the shelves, which are relatively small in width, can smoothly flow into the rear region in the bowl portion. Further, when the bowl portion is approached to the side shelf portion, the width is larger than that of the rear portion, so that the washing water is less likely to fall from the shelf portion and is more likely to move forward along the shelf portion. Therefore, it is possible to improve the cleanability of the rear region in the bowl portion to which filth easily adheres and suppress the deterioration of the swirlability.

In the present invention, preferably, the bowl portion further includes an outer connecting portion that connects the lower end portion of the rim portion and the outer edge portion of the shelf portion with a curved surface, and the curved surface of the outer connecting portion. The radius of curvature in the vertical direction of the bowl portion is set to decrease from the rear to the side of the bowl portion.

In the present invention configured as described above, the bowl portion further includes an outer connecting portion that connects the lower end portion of the rim portion and the outer edge portion of the shelf portion with a curved surface, and the outer connecting portion of the outer connecting portion. Since the radius of curvature of the curved surface in the vertical direction is set to increase from the side of the bowl to the rear, the wash water discharged from the rim spout toward the rear end is applied to the outer connecting portion behind the bowl. When approaching, the curved surface of the outer connecting portion can smoothly flow into the rear region in the bowl portion from the shelf portion having a relatively large radius of curvature in the vertical direction and a relatively small width. Further, when approaching the shelf on the side of the bowl, the width is wider than the rear and the curvature deformation of the curved surface of the outer connecting portion in the vertical direction is smaller than that on the rear, so that the washing water does not easily fall from the shelf. It becomes easier to go forward along the top. Therefore, if filth easily adheres to the bowl portion, it is possible to further improve the cleanability of the rear region in the bowl portion and further suppress the deterioration of the swivelability.

In the present invention, preferably, the radius of curvature of the curved surface of the outer connecting portion in the vertical direction at a position symmetrical with respect to the center of the bowl portion is determined by the rim spout in the lateral region of the bowl portion. The region on one side that is formed is set to be larger than the region on the other side where the rim spout is not formed.

In the present invention configured as described above, the rim spout in the lateral region of the bowl portion has a radius of curvature in the vertical direction of the curved surface of the outer connecting portion at a position symmetrical with respect to the center of the bowl portion. Since the area on one side that is formed is set to be larger than the area on the other side where the rim spout is not formed, the wash water discharged from the rim spout toward the rear end. When the bowl portion approaches the rear from one side region of the side region, the relatively small shelf portion can smoothly flow into the rear region in the bowl portion. Further, when the bowl portion is approached to the side shelf portion, the width is larger than that of the rear portion, so that the washing water is less likely to fall from the shelf portion and is more likely to move forward along the shelf portion. Therefore, it is possible to further improve the detergency of the rear region in the bowl portion to which the filth easily adheres, and further suppress the deterioration of the swivel property.

In the present invention, preferably, the bowl portion further includes an inner connecting portion that connects the inner edge portion of the shelf portion and the upper edge portion of the filth receiving surface with a curved surface, and the inner connecting portion. The radius of curvature of the curved surface in the vertical direction is set to decrease from the rear to the side of the bowl portion.

In the present invention configured as described above, the bowl portion further includes an inner connecting portion that connects the inner edge portion of the shelf portion and the upper edge portion of the filth receiving surface with a curved surface, and the inner connecting portion is provided. Since the radius of curvature in the vertical direction of the curved surface of the portion is set to decrease from the rear of the bowl portion to the side, the washing water discharged rearward from the rim spout is inserted into the inner connecting portion behind the bowl portion. When hooked, the curved surface of the inner connecting portion can smoothly flow into the rear region in the bowl portion from the shelf portion having a relatively large radius of curvature in the vertical direction and a relatively small width. In addition, when approaching the shelf on the side of the bowl, the width is wider than the rear and the radius of curvature of the curved surface of the inner connecting portion in the vertical direction is small, so that the washing water does not easily fall from the shelf and runs along the shelf. It becomes easier to go forward. Therefore, it is possible to further improve the detergency of the rear region in the bowl portion to which the filth easily adheres, and further suppress the deterioration of the swivel property.

In the present invention, preferably, the shelf portion has an inclined surface that inclines downward from the outside to the inside of the bowl portion, and the inclination angle of the inclined surface is located from the rear to the side of the bowl portion. It is set to become smaller as it is used.

In the present invention configured as described above, the shelf portion has an inclined surface that inclines downward from the outside to the inside of the bowl portion, and the inclination angle of this inclined surface is located from the rear to the side of the bowl portion. Since it is set to become smaller as the bowl is set, when the wash water discharged from the rim spout toward the rear end reaches the inclined surface of the shelf behind the bowl, the inclination angle is relatively large and the width is compared. It can flow smoothly from a small shelf to the rear area inside the bowl. Further, when the bowl portion is approached to the side shelf portion, the width is larger and the inclination angle is smaller than that of the rear portion, so that the washing water is less likely to fall from the shelf portion and is more likely to move forward along the shelf portion. Therefore, it is possible to further improve the detergency of the rear region in the bowl portion to which the filth easily adheres, and further suppress the deterioration of the swivel property.

According to the water-washing toilet bowl of the present invention, it is possible to improve the cleanability of the rear region in the bowl portion to which filth is likely to adhere, and to suppress the deterioration of the swirlability.

A central side sectional view of a toilet bowl body of a flush toilet according to an embodiment of the present invention. The plan view of the toilet body of the flush toilet according to one Embodiment of this invention. FIG. 2 is a cross-sectional view taken along the line A1-A1 of FIG. FIG. 2 is a cross-sectional view taken along the line A2-A2 of FIG. FIG. 2 is a cross-sectional view taken along the line B1-B1 of FIG. FIG. 2 is a cross-sectional view taken along the line B2-B2 of FIG. FIG. 2 is a cross-sectional view taken along the line C1-C1 of FIG. FIG. 2 is a cross-sectional view taken along the line C2-C2 of FIG. FIG. 2 is a cross-sectional view taken along the line DD of FIG.

Hereinafter, a flush toilet according to an embodiment of the present invention will be described with reference to the drawings.
First, the configuration of the flush toilet according to the embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a central side sectional view of the toilet bowl body of the flush toilet according to the embodiment of the present invention, and FIG. 2 is a plan view of the toilet bowl body of the flush toilet according to the embodiment of the present invention.

As shown in FIGS. 1 and 2, the flush toilet bowl 1 according to the embodiment of the present invention includes a pottery bowl body 2 made of earthenware.
In the flush toilet bowl 1 of the present embodiment shown in FIGS. 1 and 2, a toilet seat and a toilet lid are provided on the upper surface of the toilet bowl main body 2, and a local part of the user is washed on the rear side thereof. Functional parts such as a sanitary cleaning part and a water supply system functional part related to the water supply function to the toilet bowl main body 2 are provided, but these are not shown and the description thereof will be omitted.

Further, as shown in FIGS. 1 and 2, the toilet bowl main body 2 has a bowl-shaped filth receiving surface 4, a shelf 6 formed on the upper edge of the filth receiving surface 4, and an outer edge of the shelf 6. A bowl portion 10 including a rim portion 8 formed so as to rise from the portion is provided.
Further, as shown in FIG. 1, the toilet bowl main body 2 is provided with a drain trap pipeline 12 which is a drainage channel for discharging filth in the bowl portion 10 by connecting an inlet portion 12a below the bowl portion 10. ..
Here, in the flush toilet bowl 1 according to the first embodiment of the present invention shown in FIGS. 1 and 2, the central axis in the horizontal and horizontal directions in the plan view of the bowl portion 10 of the toilet bowl body 2 is indicated by “X” and is horizontal. The central axis in the front-rear direction is indicated by "Y", and the central axis in the vertical direction passing through the center O of the bowl portion 10 is indicated by "Z".
Further, as shown in FIG. 2, the front-back and left-right directions of the flush toilet bowl 1 are indicated by "front", "rear", "left", and "right", respectively.
Then, as shown in FIGS. 1 and 2, the center O in the bowl portion 10 of the flush toilet bowl 1, the central axis X in the horizontal and horizontal directions, and the central axis Z in the vertical direction are on the front side and the rear side, respectively. Is defined as "front side area F" and "rear side area B", respectively.
Further, as shown in FIG. 2, the “left side region L” is set for each of the left side and right side regions when viewed from the front with respect to the center O in the bowl portion 10 of the flush toilet bowl 1 and the central axis Y in the horizontal anteroposterior direction. , "Right side area R" are defined respectively.

Next, as shown in FIGS. 1 and 2, the rim portion 8 on one of the left and right sides in the rear side region B of the bowl portion 10, that is, the rear side region of the bowl portion 10 when viewed from the front of the toilet bowl body 2. On the inner peripheral side of the rim portion 8 of the right side region R in B, a single portion of the rim spouting portion that forms a swirling flow by spouting wash water into the bowl portion 10 toward the rear end portion. The rim spout 14 is formed. That is, this single rim spout 14 is the only spout on the entire circumference of the rim portion 8 provided on the rear side region B and a part of the right side region R on the entire circumference of the inner peripheral side of the rim portion 8. ..
Further, the upstream side of the rim water passage (not shown) on the upstream side of the rim spout 14 is connected to a water service (not shown) or the like which is a washing water source via a water pipe (not shown) or the like. ..
Further, the shelf portion 6 of the bowl portion 10 is formed in the circumferential direction from the rim spout port 14 to the downstream side, and the washing water discharged from the rim spout port 14 to the rear (rim spout) is discharged from the shelf portion 6. It is designed to be guided in the circumferential direction along the top.

In the flush toilet bowl 1 of the present embodiment, the rim spout 14 is formed on the inner peripheral side of the right rim portion 8 in the rear side region B of the bowl portion 10 when viewed from the front of the toilet bowl body 2. However, the present invention is not limited to such a form, and the single rim spout 14 is provided on the inner peripheral side of either the left or right rim portion 8 of the rear side region B of the bowl portion 10. The form may be such that water is discharged from the rim spout 14 through the rear end of the bowl 10 and then toward the front region F of the bowl 10 (rim spout). For example, between the central axis Y and the central axis X in the rear side region B, a rim spout is formed on the central axis Y side from the center between the central axis Y and the central axis X, and the central axis Y and the bowl The rim water may be discharged in the same direction as the central axis X extends toward the intersection with the portion 20.

Further, as shown in FIG. 1, a jet spout 16 is formed at the bottom of the bowl portion 10 so as to be directed to the inlet portion 12a of the drain trap pipeline 12, and water is also supplied from the jet spout 16. Water discharge (jet water discharge) is performed from the system function unit (not shown).
In the flush toilet bowl 1 according to the present embodiment, the rim water discharge by the rim water discharge port 14 is performed by using the water supply pressure of the tap water, and the pressure pump (not shown) is controlled for the jet water discharge by the jet water discharge port 16. The form of the so-called hybrid type flush toilet that supplies the flush water in the water storage tank (not shown) will be described, but the present invention is not limited to such a form and can be applied to other forms. Further, the jet water discharge by the jet water discharge port 16 may be omitted.

Next, with reference to FIGS. 1 to 9, the details of the portion from the upper edge portion to the rim portion 8 of the waste receiving surface 4 of the bowl portion 10 of the flush toilet bowl 1 according to the embodiment of the present invention will be described.
First, FIG. 4 is a cross-sectional view (A1-A1 cross-sectional view) along line A1-A1 of FIG. 2, and FIG. 5 is a cross-sectional view (A2-A2 cross-sectional view) of FIG. 2 along line A2-A2. ).
Next, FIG. 6 is a cross-sectional view (B1-B1 cross-sectional view) along the B1-B1 line of FIG. 2, and FIG. 7 is a cross-sectional view (B2-B2 cross-sectional view) of FIG. 2 along the B2-B2 line. Figure).
8 is a cross-sectional view (C1-C1 cross-sectional view) along the C1-C1 line of FIG. 2, and FIG. 9 is a cross-sectional view (C2-C2 cross-sectional view) of FIG. 2 along the C2-C2 line. ).
Further, FIG. 10 is a cross-sectional view (DD cross-sectional view) along the DD line of FIG.
Here, in the present embodiment, each of the B1-B1 cross-sectional view shown in FIG. 6 and the C1-C1 cross-sectional view shown in FIG. 8 is along the A1-A1 line in the toilet bowl main body 2 in the plan view shown in FIG. It is a partial cross-sectional view of the rear side region B of the bowl portion 10 shifted counterclockwise by 30 ° and 60 ° in the circumferential direction about the center O of the bowl portion 10 from the cross section.
Further, with respect to each of the B2-B2 cross-sectional view shown in FIG. 7, the C2-C2 cross-sectional view shown in FIG. 9, and the DD cross-sectional view shown in FIG. It is a partial cross-sectional view of the rear side region B of the bowl portion 10 shifted clockwise by 30 °, 60 °, and 90 ° in the circumferential direction about the center O of the bowl portion 10 from the cross section along the A2 line.

First, as shown in FIGS. 1 to 9, the shelf portion 6 includes an inclined surface 6a in the bowl portion 10 that inclines downward from the outside to the inside, and each of the shelf portions 6 shown in FIGS. 3 to 9 is provided. The inclination angles α1, α2, β1, β2, γ1, γ2, δ of the inclined surface 6a are set to become smaller as they are located from the rear to the side of the bowl portion 10 (α1 ≦ β1 <γ1 ≦ δ). , Α2 ≦ β2 <γ2 <δ). The inclination angle of the inclined surface 6a may be 0 ° on the front side of the α1 and α2, the B1-B1 cross section, and the B2-B2 cross section.

Further, as shown in FIGS. 2, 5 and 6, at the inclination angles β1 and β2 of the inclined surface 6a of the shelf portion 6 at positions symmetrical with respect to the center O of the bowl portion 10, the side of the bowl portion 10 The inclination angle β1 of the inclined surface 6a of the shelf portion 6 in the one side region (the right region R when the toilet body 2 is viewed from the front) in which the rim spout 14 is formed in the side region is the rim spout. It is set to be larger than the inclination angle β2 of the inclined surface 6a of the shelf portion 6 in the region on the other side where 14 is not formed (the left region L when the toilet body 2 is viewed from the front) (β1> β2). ..
Similarly, as shown in FIGS. 7 and 8, at the inclination angles γ1 and γ2 of the inclined surface 6a of the shelf portion 6 at positions symmetrical with respect to the center O of the bowl portion 10, the lateral region of the bowl portion 10 The inclination angle γ1 of the inclined surface 6a of the shelf portion 6 of the one-sided region where the rim spouting port 14 is formed is the other side region (toilet bowl body 2) where the rim spouting port 14 is not formed. It is set so as to be larger than the inclination angle γ2 of the inclined surface 6a of the shelf portion 6 in the left side region L) when viewed from the front (γ1> γ2).

Further, the widths a1, a2, b1, b2, c1, c2, d of the shelf portion 6 corresponding to the length of the cosine component of each inclined surface 6a of the shelf portion 6 shown in FIGS. 3 to 9 are the bowl portions 10. It is set to increase from the rear to the side (a1> b1> c1 ≧ d, a2> b2> c2> d).

Next, as shown in FIGS. 3 to 9, the bowl portion 10 further forms a curved surface R1, R2, S1, S2, T1 between the lower end portion 8a of the rim portion 8 and the outer edge portion 6b of the shelf portion 6. , T2, U1 to provide an outer connecting portion 18 to be connected. The radius of curvature r1, r2, s1, s2, t1, t2, u1 in the vertical direction in elevation view of each curved surface R1, R2, S1, S2, T1, T2, U1 of the outer connecting portion 18 is a bowl portion 10. It is set so that it becomes smaller from the rear to the side (r1 <s1 <t1 ≦ u1, r2 <s2 <t2 <u1).

Next, as shown in FIGS. 2, 3 and 4, the radius of curvature r1 and r2 of the curved surfaces R1 and R2 of the outer connecting portion 18 at positions symmetrical with respect to the center O of the bowl portion 10 The radius of curvature r1 of the region on one side (the region R on the right side when the toilet body 2 is viewed from the front) in which the rim spout 14 is formed in the lateral region of the bowl portion 10 has the rim spout 14. It is set to be larger than the radius of curvature r2 of the region on the other side that is not formed (the region L on the left side when the toilet body 2 is viewed from the front) (r1> r2).
Similarly, as shown in FIGS. 5 and 6, at the radius of curvature s1 and s2 of the curved surfaces S1 and S2 of the outer connecting portion 18 at positions symmetrical with respect to the center O of the bowl portion 10, the bowl portion 10 The rim spout 14 is formed in the radius of curvature s1 of the region on one side (the region R on the right side when the toilet body 2 is viewed from the front) in which the rim spout 14 is formed. It is set to be larger than the radius of curvature s2 of the region on the other side (the region L on the left side when the toilet body 2 is viewed from the front).
Similarly, as shown in FIGS. 7 and 6, at the radius of curvature t1 and t2 of the curved surfaces T1 and T2 of the outer connecting portion 18 at positions symmetrical with respect to the center O of the bowl portion 10, the bowl. The rim spout 14 is formed in the radius of curvature t1 of the region on one side (the region R on the right side when the toilet body 2 is viewed from the front) in which the rim spout 14 is formed in the lateral region of the portion 10. It is set to be larger than the radius of curvature t2 of the region on the other side (the region L on the left side when the toilet body 2 is viewed from the front).

Next, as shown in FIGS. 3 to 9, the bowl portion 10 further has curved surfaces R3, R4, S3, S4 between the inner edge portion 6c of the shelf portion 6 and the upper edge portion 4a of the waste receiving surface 4. , T3, T4, and U2 are provided as inner connecting portions 20. The vertical curvature radii r3, r4, s3, s4, t3, t4, u2 in the elevation view of each curved surface R3, R4, S3, S4, T3, T4, U2 of the inner connecting portion 20 are the bowl portion 10. It is set so that it becomes smaller from the rear to the side (r3 <s3 <t3 <u2, r4 <s4 <t4 <u2).

According to the flush toilet bowl 1 according to the embodiment of the present invention described above, the rim of the rim water discharge portion provided on the rim portion 8 on one of the left and right sides (right region R) in the rear side region B of the bowl portion 10. The washing water discharged from the spout 14 toward the rear end flows along the shelf 6 and is guided in the circumferential direction of the bowl 10 to form a swirling flow (swirl flow).
At this time, as shown in FIGS. 3 to 9, the widths a1, a2, b1, b2, c1, c2d of the shelf portion 6 are set to increase from the rear to the side of the bowl portion 10. (A1>b1> c1 ≧ d, a2>b2>c2> d) Therefore, when the washing water discharged rearward from the rim spout 14 reaches the shelf 6 behind the bowl portion 10, the widths are compared. It is possible to smoothly flow from the small shelf portion 6 to the rear side region B in the bowl portion 10. Further, when the bowl portion 10 is approached to the side shelf portion 6, the width is larger than that of the rear portion, so that the washing water is less likely to fall from the shelf portion 6 and is more likely to move forward along the shelf portion 6.
Therefore, it is possible to improve the cleanability of the rear side region B in the bowl portion 10 to which the filth easily adheres, and to suppress the deterioration of the swivelability.

Further, according to the water-washing stool 1 according to the embodiment of the present invention described above, the bowl portion 10 further has curved surfaces R1 and R2 between the lower end portion 8a of the rim portion 8 and the outer edge portion 6b of the shelf portion 6. , S1, S2, T1, T2, U1 are provided, and the curvatures of the curved surfaces R1, R2, S1, S2, T1, T2, U1 of the outer connecting portion 18 in the vertical direction are provided. Since the radius r1, r2, s1, s2, t1, t2, u1 is set to decrease from the rear to the side of the bowl portion 10 (r1 <s1 <t1 ≦ u1, r2 <s2 <t2 <u1). When the wash water discharged from the rim spout 14 toward the rear end reaches the outer connecting portion 18 behind the bowl portion 10, in particular, a vertical comparison of the curved surface U1 of the outer connecting portion 18 shown in FIG. It is possible to smoothly flow from the shelf portion 6 having a relatively small width d with a large radius of curvature u1 into the rear side region B in the bowl portion 10. Further, when approaching the shelf portion 6 on the side of the bowl portion 10, the width is larger than that of the rear portion and the curvature deformation of the curved surface of the outer connecting portion 18 in the vertical direction is smaller than that of the rear portion. It is hard to fall off and it becomes easier to move forward along the shelf 6.
Therefore, if filth easily adheres to the bowl portion 10, it is possible to further improve the cleanability of the rear side region B in the bowl portion 10 and further suppress the deterioration of the swivelability.

Further, according to the flush toilet bowl 1 according to the embodiment of the present invention described above, the curved surfaces R1, R2, S1, S2, T1 of the outer connecting portion 18 at positions symmetrical with respect to the center O of the bowl portion 10. For each radius of curvature r1, r2, s1, s2, t1, t2, u1 in the vertical direction of T2, U1, one side region (1 side region) in which the rim spout 14 is formed in the lateral side region of the bowl portion 10 ( The area R on the right side when the toilet body 2 is viewed from the front is set to be larger than the area on the other side where the rim spout 14 is not formed (the area on the left side when the toilet body 2 is viewed from the front). (R1> r2, s1> s2, t1> t2), so that the wash water discharged from the rim spout 14 toward the rear end is on one side of the side region of the bowl portion 10 (right region R and When approaching the rear side region B from the front side region F), the toilet portion 6 having a relatively small width can smoothly flow into the rear side region B in the bowl portion 10. Further, when the bowl portion 10 is approached to the side shelf portion 6, the width is larger than that of the rear portion, so that the washing water is less likely to fall from the shelf portion 6 and is more likely to move forward along the shelf portion 6.
Therefore, it is possible to further improve the cleanability of the rear side region B in the bowl portion to which the filth easily adheres, and further suppress the deterioration of the swivelability.

Further, according to the water-washing stool 1 according to the embodiment of the present invention described above, the bowl portion 10 further has a curved surface R3 between the inner edge portion 6c of the shelf portion 6 and the upper edge portion 4a of the filth receiving surface 4. , R4, S3, S4, T3, T4, U2 are provided, and each curved surface R3, R4, S3, S4, T3, T4, U2 of the inner connecting portion 20 is provided in the vertical direction. Each radius of curvature r3, r4, s3, s4, t3, t4, u2 is set to decrease from the rear to the side of the bowl portion 10 (r3 <s3 <t3 <u2, r4 <s4 <t4 <u2). Therefore, when the wash water discharged rearward from the rim spout 14 reaches the inner connecting portion 20 behind the bowl portion 10, in particular, the curved surface U2 of the inner connecting portion 20 shown in FIG. 9 is relatively in the vertical direction. The shelf portion 6 having a large radius of curvature u2 and a relatively small width can smoothly flow into the rear side region B in the bowl portion 10. Further, when the shelf portion 6 on the side of the bowl portion 10 is approached, the width is larger than that of the rear portion and the radius of curvature of the curved surface of the inner connecting portion 20 in the vertical direction is small, so that the washing water does not easily fall from the shelf portion 6 and the shelf. It becomes easier to move forward along the part 6.
Therefore, it is possible to further improve the cleanability of the rear side region B in the bowl portion to which the filth easily adheres, and further suppress the deterioration of the swivelability.

Further, according to the water-washing stool 1 according to the embodiment of the present invention described above, the shelf portion 6 is provided with an inclined surface 6a in which the shelf portion 6 is inclined downward from the outside to the inside of the bowl portion 10, and FIGS. As shown in the above, the inclination angles α1, α2, β1, β2, γ1, γ2, δ of each inclined surface 6a of the shelf portion 6 are set to become smaller as they are located from the rear to the side of the bowl portion 10. (Α1 ≦ β1 <γ1 ≦ δ, α2 ≦ β2 <γ2 <δ), so that the wash water discharged rearward from the rim spout 14 is the inclined surface 6a of the shelf 6 rearward from the side of the bowl portion 10. In particular, the shelf portion 6 having a relatively large inclination angle δ and a relatively small width d shown in FIG. 9 can smoothly flow into the rear side region B in the bowl portion 10. Further, when approaching the shelf portion 6 on the side of the bowl portion 10, the width is larger and the inclination angle is smaller than that of the rear portion, so that the washing water is less likely to fall from the shelf portion 6 and heads further forward along the shelf portion 6. It will be easier.
Therefore, it is possible to further improve the cleanability of the rear region in the bowl portion 10 to which the filth easily adheres, and further suppress the deterioration of the swirlability.

1 Washing bowl 2 Toilet body 4 Sewage receiving surface 4a Upper edge of sewage receiving surface 6 Shelf 6a Inclined surface of shelf 6b Outer edge of shelf 6c Inner edge of shelf 8 Rim 8a Lower end of rim 10 Bowl part 12 Drain trap pipeline 12a Inlet part 14 Rim spout 16 Jet spout 18 Outer connection part 20 Inner connection part X Horizontal and horizontal center axis of bowl part Y Horizontal center axis of bowl part Z Bowl part Vertical central axis passing through the center B Rear area of the bowl F Front area of the bowl L Left area of the bowl O Center of the bowl R Right area of the bowl

Claims (5)

A flush toilet that is washed by the wash water supplied from the wash water source and discharges filth.
A bowl portion having a bowl-shaped filth receiving surface and a rim portion formed on the upper edge portion of the filth receiving surface.
A drainage channel connected to the bottom of this bowl to drain filth,
It has a rim water discharge portion provided on the rim portion and discharges washing water into the bowl portion to form a swirling flow.
The bowl portion is further formed in the circumferential direction from the rim water discharge portion between the upper edge portion of the filth receiving surface and the lower end portion of the rim portion, and the washing water discharged from the rim water discharge portion is circumscribed. Equipped with a shelf that leads to
The rim water discharge portion is provided on either the left or right rim portion of the rear side region of the bowl portion, and discharges wash water toward the front side region of the bowl portion after passing through the rear end in the bowl portion. Forming a single rim spout,
A flush toilet in which the width of the shelf portion is set to increase from the rear of the bowl portion to the side. The bowl portion further includes an outer connecting portion that connects the lower end portion of the rim portion and the outer edge portion of the shelf portion with a curved surface, and the radius of curvature of the curved surface of the outer connecting portion in the vertical direction is The water-washing toilet bowl according to claim 1, wherein the bowl portion is set to become smaller from the rear side to the side. The vertical radius of curvature of the curved surface of the outer connecting portion at a position symmetrical with respect to the center of the bowl portion is one side of the lateral region of the bowl portion on which the rim spout is formed. The flush toilet according to claim 2, wherein the region is set to be larger than the region on the other side where the rim spout is not formed. The bowl portion further includes an inner connecting portion that connects the inner edge portion of the shelf portion and the upper edge portion of the filth receiving surface with a curved surface, and the curvature of the curved surface of the inner connecting portion in the vertical direction. The water-washing toilet according to any one of claims 1 to 3, wherein the radius is set so as to decrease from the rear of the bowl portion to the side. The shelf portion has an inclined surface that inclines downward from the outside to the inside of the bowl portion, and the inclination angle of the inclined surface is set so as to be located from the rear to the side of the bowl portion. The flush toilet according to any one of claims 1 to 4.

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