Water-washable toilet

Abstract

The present invention aims to provide a flush toilet that can thoroughly clean the waste receiving surface by allowing the cleaning water swirling over the shelf to flow down onto the waste receiving surface. [Solution] The present invention provides a bowl portion 6 comprising a waste receiving surface 18 for receiving waste, a rim portion 20 formed above the waste receiving surface 18, a shelf portion 22 formed between the waste receiving surface 18 and the rim portion 20, and a pot portion 24 formed below the waste receiving surface 18 with a water reservoir WL formed inside; a drain trap pipe 8 connected below the bowl portion 6 for discharging waste; and a single rim outlet 10 provided on the rim portion 20, which discharges cleaning water along the inner circumferential surface 20a of the rim portion 20 to form a swirling flow. The shelf portion 22 is provided around the entire circumference of the bowl portion 6, and is formed such that the width W1 of the shelf portion 22 is minimized in a first region A1 where the outer peripheral edge 22a of the shelf portion 22 has the minimum radius of curvature R1 in a plan view.

Description

Technical Field

[0001] The present invention relates to a flush toilet, and particularly to a flush toilet that cleans with flushing water to discharge filth.

Background Art

[0002] Conventionally, as described in Patent Document 1, for example, there has been known a flush toilet including: a filth receiving surface for receiving filth; a rim portion formed above the filth receiving surface; a shelf portion formed between the filth receiving surface and the rim portion; and one rim water spout provided on the rim portion, which discharges flushing water along the inner circumferential surface of the rim portion to form a swirling flow. In such a flush toilet, in the front region of the bowl portion where the radius of curvature is small, it is difficult for the flushing water swirling on the shelf portion to flow down to the filth receiving surface, so the width of the shelf portion in the front region of the bowl portion is reduced. This makes it easy for the flushing water swirling on the shelf portion to flow down in the front region of the bowl portion, thereby improving the cleaning performance of the bowl portion.

Prior Art Literature

Patent Literature

[0003]

Patent Document 1

Summary of the Invention

Problem to be Solved by the Invention

[0004] However, in the flush toilet described in the above-mentioned Patent Document 1, although the width of the shelf portion is reduced in the front region where the radius of curvature of the bowl portion is small, the structure is not configured to change the width of the shelf portion in accordance with the radius of curvature of the outer peripheral edge of the shelf portion. Therefore, for example, in a portion where the radius of curvature of the bowl portion is large but the radius of curvature of the outer peripheral edge of the shelf portion is small, it is still difficult for the flushing water swirling on the shelf portion to flow down to the filth receiving surface, and there arises a problem that filth adhering to the filth receiving surface remains without being washed away.

[0005] As a result of diligent research, the inventors have found that in order to solve the problem of dirt remaining attached to the dirt receiving surface without being washed away, it is important to change the width of the shelf with respect to the radius of curvature of the outer edge of the shelf.

[0006] Therefore, the present invention has been made to solve the above-mentioned problems, and aims to provide a flush toilet that can thoroughly clean the waste receiving surface by allowing the cleaning water swirling over the shelf to flow down onto the waste receiving surface. [Means for solving the problem]

[0007] To achieve the above objective, the present invention provides a flush toilet that washes with flushing water and discharges waste, comprising: a bowl portion having a waste receiving surface for receiving waste, a rim portion formed above the waste receiving surface, a shelf portion formed between the waste receiving surface and the rim portion, and a pot portion formed below the waste receiving surface with a water reservoir formed inside; a drain trap pipe connected below the bowl portion for discharging waste; and a single rim outlet provided in the rim portion that discharges flushing water along the inner circumferential surface of the rim portion to form a swirling flow, wherein the shelf portion is provided around the entire circumference of the bowl portion, and is characterized in that the width of the shelf portion is minimized in a first region where the outer edge of the shelf portion has the minimum radius of curvature in a plan view.

[0008] According to the present invention configured in this way, the shelf portion is provided around the entire circumference of the bowl portion, and in a plan view, the width of the shelf portion is minimized in the first region where the outer edge of the shelf portion has the smallest radius of curvature. Therefore, in the first region where the washing water is less likely to flow down to the waste receiving surface due to the influence of centrifugal force, the washing water swirling on the shelf portion can be made to flow down to the waste receiving surface, and the waste receiving surface can be thoroughly cleaned.

[0009] In the present invention, preferably, the rim spout is provided on either the left or right side of the bowl portion and is configured to discharge cleaning water forward, and the width of the shelf portion on one of the left and right sides of the bowl portion where the rim spout is provided is formed to be greater than the width of the shelf portion on the other side. In the present invention configured as described above, the rim spout is provided on either the left or right side of the bowl portion and is configured to discharge cleaning water forward. The width of the shelf portion on one of the left or right sides of the bowl portion where the rim spout is provided is formed to be greater than the width of the shelf portion on the other side. This prevents the cleaning water from falling onto the waste receiving surface immediately after being discharged from the rim spout and allows it to swirl around on the shelf portion.

[0010] Furthermore, in the present invention, preferably, the width of the shelf portion is formed to be substantially constant in the second region where the outer edge of the shelf portion has the largest radius of curvature in a plan view. In the present invention configured in this way, the width of the shelf is formed to be approximately constant in the second region where the outer edge of the shelf has the largest radius of curvature in a plan view. Therefore, in the second region, the washing water can be rotated on the shelf while preventing it from falling onto the waste receiving surface.

[0011] In the present invention, preferably, the width of the shelf portion is formed such that in the third region between the first and second regions, it gradually decreases as it approaches the first region from the second region. In the present invention configured in this way, the width of the shelf is formed such that in the third region between the first and second regions, it gradually decreases as it approaches the first region from the second region. Therefore, in the third region, the amount of washing water swirling over the shelf and the amount of washing water flowing down to the waste receiving surface can be adjusted, allowing the waste receiving surface to be thoroughly cleaned.

[0012] Furthermore, in the present invention, preferably, a first region is formed on the front side of the bowl portion where the radius of curvature of the outer edge of the shelf portion is smallest in a plan view, and a second region is formed on the left and right sides of the bowl portion where the radius of curvature of the outer edge of the shelf portion is largest in a plan view. In the present invention configured as described above, a first region is formed on the front side of the bowl portion where, in plan view, the outer edge of the shelf portion has the smallest radius of curvature, and second regions are formed on the left and right sides of the bowl portion where, in plan view, the outer edge of the shelf portion has the largest radius of curvature. Therefore, in the first region on the front side of the bowl portion, the washing water swirling over the shelf portion can flow down to the waste receiving surface, allowing the waste receiving surface to be thoroughly cleaned.

[0013] In the present invention, preferably, the width of the shelf portion on the rear side of the bowl portion is formed to be greater than the width of the shelf portion in the first region and smaller than the width of the shelf portion in the second region. In the present invention configured in this way, the width of the shelf at the rear of the bowl is formed to be greater than the width of the shelf in the first region and smaller than the width of the shelf in the second region. This increases the amount of washing water flowing down to the waste receiving surface at the rear of the bowl, making it possible to wash the rear of the bowl where waste tends to adhere. [Effects of the Invention]

[0014] According to the flush toilet of the present invention, the flushing water swirling over the shelf flows down onto the waste receiving surface, allowing the waste receiving surface to be thoroughly cleaned. [Brief explanation of the drawing]

[0015] [Figure 1] This is a plan view of a flush toilet according to an embodiment of the present invention. [Figure 2] This is a cross-sectional view along line II-II in Figure 1. [Figure 3] This is a cross-sectional view along line III-III in Figure 2. [Figure 4A] This is a cross-sectional view along the IVA-IVA line in Figure 3. [Figure 4B]It is a cross-sectional view taken along line IVB-IVB in FIG. 3 [Figure 4C] It is a cross-sectional view taken along line IVC-IVC in FIG. 3 [Figure 4D] It is a cross-sectional view taken along line IVD-IVD in FIG. 3 [Figure 4E] It is a cross-sectional view taken along line IVE-IVE in FIG. 3 [Figure 4F] It is a cross-sectional view taken along line IVF-IVF in FIG. 3 [Figure 4G] It is a cross-sectional view taken along line IVG-IVG in FIG. 3 [Figure 5] It is a plan view showing the flow of flush water in the flush toilet according to an embodiment of the present invention MODE FOR CARRYING OUT THE INVENTION

[0016] Hereinafter, with reference to the drawings, a flush toilet according to an embodiment of the present invention (hereinafter referred to as the present embodiment) will be described First, with reference to FIG. 1 and FIG. 2, the overall structure of the flush toilet according to the present embodiment will be described Here, FIG. 1 is a plan view of the flush toilet according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1

[0017] As shown in FIG. 1 and FIG. 2, the flush toilet 1 according to the present embodiment is a so-called siphon-jet type toilet that fills the inside of a drain trap pipeline by jet water discharge to generate a siphon action. The flush toilet 1 includes: a ceramic toilet body 2; a toilet seat and a toilet lid (not shown) arranged on an upper surface of the toilet body 2; and a water storage tank (not shown) arranged at an upper rear portion of the toilet body 2 and storing flush water used for toilet flushing Note that the flush toilet of the present invention is not limited to the siphon-jet type flush toilet, and may be a siphon type flush toilet that generates siphon action by rim water discharge, or a wash-down type flush toilet that flushes away filth by the flowing water action caused by the head difference of flush water in the bowl portion

[0018] The flush toilet 1 is equipped with a ceramic toilet body 2, which has a bowl-shaped bowl section 6, a drain trap pipe 8 connected below the bowl section 6 for discharging waste, a rim spout 10 for discharging water from the rim, a rim water channel 12 for supplying flushing water to the rim spout 10, a jet spout 14 for discharging water in a jet stream, and a jet water channel 16 for supplying flushing water to the jet spout 14.

[0019] The bowl portion 6 comprises a waste receiving surface 18 for receiving waste, a rim portion 20 formed above the bowl portion 6 and having an inner circumferential surface 20a on its inside, a shelf portion 22 formed between the waste receiving surface 18 and the rim portion 20, and a pot portion 24 formed below the waste receiving surface 18 with a water reservoir WL formed inside.

[0020] The drain trap pipe 8 comprises an inlet 8a, an upward pipe 8b extending upward from the inlet 8a, a downward pipe 8c extending downward from the upward pipe 8b, and a top 8d located between the downward pipe 8c and the upward pipe 8b, which defines the water level of the accumulated water surface WL. Here, the lower end of the descending pipe 8c of the drain trap pipe 8 is connected to a drain pipe (not shown) via a drain socket (not shown).

[0021] The rim outlet 10 is located in the rear left area of ​​the bowl section 6 and is configured to discharge cleaning water forward. The cleaning water discharged from the rim outlet 10 flows down onto the waste receiving surface 18, swirling around the inner circumferential surface 20a of the rim section 20 and the shelf section 22, and the swirling flow cleans the waste receiving surface 18.

[0022] The rim water channel 12 is formed in a tapered shape, with the cross-sectional area of ​​the channel gradually decreasing towards the rim outlet 10. A water supply pipe (not shown), which is the water source, is connected to the upstream side of the rim water channel 12. Cleaning water is supplied to the rim water channel 12 from the water supply pipe, and the water pressure from the water supply pipe is used to discharge the cleaning water from the rim outlet 10. The water source that supplies cleaning water to the rim outlet 10 is not limited to the water pipe shown in this embodiment, but may be a water storage tank or a pump, etc.

[0023] The jet outlet 14 is formed at the bottom of the bowl section 6. The jet outlet 14 is positioned opposite the inlet 8a of the drain trap pipe 8 and is directed toward the inlet 8a of the drain trap pipe 8. The jet outlet 14 discharges cleaning water toward the inlet 8a of the drain trap pipe 8, quickly filling the drain trap pipe 8 with water to generate a siphon effect.

[0024] The jet conduit 16 is formed in a U-shape overall in a plan view. A water storage tank (not shown), which is a water supply source, is connected to the upstream side of the jet conduit 16. Cleaning water is supplied to the jet conduit 16 from the water storage tank, and the cleaning water is discharged from the jet outlet 14 by the head pressure of the cleaning water stored in the water storage tank. The water source that supplies cleaning water to the jet outlet 14 is not limited to the water storage tank shown in this embodiment, but may be a water pipe or a pump, etc.

[0025] In this embodiment of the flush toilet 1, the amount of flushing water used for a full flush is 4.8 liters, and the amount of flushing water used for a partial flush is 3.8 liters. In addition, the amount of flushing water discharged from the rim outlet 10 is 2.3 liters, and the instantaneous flow rate of the flushing water discharged from the rim outlet 10 is 10 to 20 liters / minute.

[0026] Next, the shape of the bowl portion 6 of the flush toilet 1 according to this embodiment will be described in detail with reference to Figures 3 and 4A to 4G. Figure 3 is a cross-sectional view along the line III-III in Figure 2, and Figures 4A to 4G are cross-sectional views along the lines IVA-IVA to IVG-IVG in Figure 3. Furthermore, in Figure 3, the center line CL1 extending in the front-to-back direction of the toilet body in a plan view divides the inside of the bowl into two equal regions in the left-to-right direction when viewed from the front of the toilet body, which are designated as the left and right sides of the bowl. Similarly, the center line CL2 extending in the left-to-right direction of the toilet body in a plan view divides the inside of the bowl into two equal regions in the front-to-back direction, which are designated as the front and rear sides of the bowl. Figures 4A to 4G show cross-sections perpendicular to the flow direction of the flushing water swirling over the shelf.

[0027] As shown in Figure 3, a shelf 22 is provided around the entire circumference of the bowl 6. The shelf 22 is formed to be nearly horizontal to the waste receiving surface 18, and is configured to allow washing water to be placed on the shelf 22 and swirl around. The shelf 22 is slightly inclined downward toward the inside of the bowl 6, and the angle of inclination of the shelf 22 toward the inside of the bowl 6 is substantially constant around the entire circumference of the bowl 6. In this embodiment, the shelf 22 is inclined downward toward the inside of the bowl 6, but it may be formed to be horizontal, or it may be inclined further to the extent that washing water can be placed on the shelf 22 and swirl around. A portion of the washing water discharged from the rim outlet 10 flows down to the waste receiving surface, and the remainder swirls around on the shelf 22.

[0028] As shown in Figures 4A to 4G, the shelf portion 22 comprises an outer peripheral edge 22a located at the outermost part of the shelf portion 22, an inner peripheral edge 22b located at the innermost part of the shelf portion 22, and a shelf surface 22c located between the outer peripheral edge 22a and the inner peripheral edge 22b, which is a substantially flat surface. The inner peripheral surface 20a of the rim portion 20 is formed to extend vertically upward from the outer peripheral edge 22a of the shelf portion 22 and then overhang toward the interior of the bowl portion 6.

[0029] As shown in Fig. 3, the outer peripheral edge 22a of the shelf portion 22 is provided, on the front side of the bowl portion 6, with a first region A1 formed by the first radius of curvature R1, which is the smallest among those of the outer peripheral edge 22a. Further, the outer peripheral edge 22a of the shelf portion 22 is provided, on the left side and the right side of the bowl portion 6, with a second region A2 formed by the second radius of curvature R2, which is the largest among those of the outer peripheral edge 22a. Furthermore, the outer peripheral edge 22a of the shelf portion 22 is provided, between the first region A1 and the second region A2, with a third region A3 formed by a third radius of curvature R3 that is larger than the first radius of curvature R1 and smaller than the second radius of curvature R2 (R1<R3<R2). Further, the outer peripheral edge 22a of the shelf portion 22 is provided, on the rear side of the bowl portion 6, with a fourth region A4 formed by a fourth radius of curvature R4 that is larger than the first radius of curvature R1 and smaller than the second radius of curvature R2 (R1<R4<R2).

[0030] As shown in Figs. 3 and 4D, in the first region A1 where the outer peripheral edge 22a of the shelf portion 22 has the minimum first radius of curvature R1 in a plan view, the width of the shelf portion 22 is formed by the minimum first width W1. Thereby, in the first region A1, even when the washing water swirling on the shelf portion 22 is affected by centrifugal force, the washing water can be caused to flow down onto the waste receiving surface 18.

[0031] As shown in Figs. 3, 4A and 4B, in the left second region A2 where the outer peripheral edge 22a of the shelf portion 22 has the maximum second radius of curvature R2 in a plan view, the width of the shelf portion 22 is formed by a substantially constant second width W2 extending from the upstream side to the downstream side. Thereby, in the left second region A2, the washing water discharged from the rim water discharge port 10 can be swirled on the shelf portion 22 while suppressing the washing water from dropping onto the waste receiving surface 18.

[0032] As shown in Figures 3 and 4F, in the second region A2 on the right side, where the outer edge 22a of the shelf 22 has the maximum second radius of curvature R2 in a plan view, the width of the shelf 22 is formed by a third width W3 that is almost constant from the upstream side to the downstream side. This allows the washing water that has passed through the first region A1 to swirl around on the shelf 22 in the second region A2 on the right side, while preventing it from falling onto the waste receiving surface 18. As a result, the washing water passing through the second region A2 on the right side is distributed as far as possible to the rear side of the bowl 6.

[0033] As shown in Figures 3, 4A, and 4F, the second width W2 of the shelf 22 on the left side of the bowl section 6, where the rim spout 10 is located, is formed to be larger than the third width W3 of the shelf 22 on the right side of the bowl section 6, where the rim spout 10 is not located. This allows the washing water to swirl on the shelf 22 while preventing it from falling onto the waste receiving surface 18 immediately after being discharged from the rim spout 10. Also, as shown in Figure 4A, the second width W2 of the shelf 22 on the left side of the bowl section 6 is set to be at least three times the width of the rim spout 10.

[0034] As shown in Figures 3 and 4C, in the third region A3 on the left side between the first region A1 and the second region A2, the fourth width W4 of the shelf 22 is formed to be approximately constant in width as it approaches the first region A1 from the second region A2, and then gradually decreases. This allows the amount of washing water swirling on the shelf 22 to be gradually reduced and the amount of washing water flowing down to the waste receiving surface 18 to be gradually increased in the third region A3 on the left side. Also, as shown in Figures 3 and 4E, in the third region A3 on the right side between the first region A1 and the second region A2, the fifth width W5 of the shelf 22 is formed to be gradually larger as it approaches the second region A2 from the first region A1, and then forms to be approximately constant in width. This allows the amount of washing water flowing down to the waste receiving surface 18 to be gradually reduced and the amount of washing water swirling on the shelf 22 to be gradually increased in the third region A3 on the right side.

[0035] As shown in Figure 3, in the region B located between virtual lines L1 and L2 that spread out in a fan shape from the center O of the bowl portion 6 at a central angle α (= approximately 45°), the fourth width W4 and fifth width W5 of the shelf portion 22 are formed to gradually decrease in size from the rear to the front. As a result, the amount of washing water flowing down to the waste receiving surface 18 on the front side of the bowl portion 6 gradually increases.

[0036] As shown in Figures 3 and 4G, in the fourth region A4, the sixth width W6 of the shelf portion 22 is larger than the first width W1 of the shelf portion 22 in the first region, and smaller than the second width W2 and third width W3 of the shelf portion 22 in the second region A2 on the left and right sides. This increases the amount of washing water flowing down to the waste receiving surface 18 on the rear side of the bowl portion 6, allowing the rear side of the bowl portion 6, where waste tends to adhere, to be cleaned. Furthermore, in the fourth region A4, the sixth width W6 of the shelf portion 22 is formed to gradually decrease in the direction in which the washing water swirls.

[0037] As shown in Figure 3, the waste receiving surface 18 (located above the pot portion 24) is formed in a concave shape that extends downwards around the entire circumference of the bowl portion 6 when viewed from the side (see Figure 2). This allows the washing water flowing down from the shelf portion 22 to rest on the waste receiving surface 18 and swirl around on it. This ensures that the waste receiving surface 18 is thoroughly cleaned. In addition, the width of the waste receiving surface 18 is greater on the front side of the bowl portion 6 than on the rear side when viewed from above (see Figure 3).

[0038] Next, with reference to Figure 5, the flow of flushing water swirling around the bowl portion 6 in the flush toilet according to this embodiment will be explained. Figure 5 is a plan view showing the flow of flushing water in a flush toilet according to an embodiment of the present invention. Furthermore, in Figure 5, F1 to F6 indicate the flow of the cleaning water.

[0039] First, as shown in Figure 5, the cleaning water supplied from the rim water channel 12 is discharged forward from the rim outlet 10. In the second region A2 on the left side, where the outer edge 22a of the shelf 22 has the maximum second radius of curvature R2, the second width W2 of the shelf 22 is formed to be almost constant, so most of the cleaning water flows over the shelf 22 (cleaning water flow F1).

[0040] Next, in the third region A3 on the left, the fourth width W4 of the shelf section 22 is formed to gradually decrease in the direction in which the washing water swirls, so that the amount of washing water flowing down to the waste receiving surface 18 gradually increases, and the remaining washing water flows over the shelf section 22 (washing water flow F2).

[0041] Furthermore, in the first region A1 where the outer edge 22a of the shelf portion 22 has the smallest first radius of curvature R1, the first width W1 of the shelf portion 22 is formed to be the smallest possible. As a result, the amount of cleaning water flowing down to the waste receiving surface 18 increases, and the remaining cleaning water flows over the shelf portion 22 (cleaning water flow F3). This allows the waste receiving surface 18 on the front side of the bowl portion 6 to be thoroughly cleaned.

[0042] Next, in the third region A3 on the right side, the fifth width W5 of the shelf section 22 is formed to gradually increase in the direction in which the washing water swirls, so that the amount of washing water flowing down to the waste receiving surface 18 gradually decreases, and the remaining washing water flows over the shelf section 22 (washing water flow F4).

[0043] Furthermore, in the second region A2 on the right side, where the outer edge 22a of the shelf portion 22 has the maximum second radius of curvature R2, the third width W3 of the shelf portion 22 is formed to be almost constant, so that most of the cleaning water flows over the shelf portion 22 (cleaning water flow F5).

[0044] Next, in the fourth area A4 on the rear side of the bowl section 6, the sixth width W6 of the shelf section 22 is formed to be relatively small, so that the amount of washing water flowing down to the waste receiving surface 18 increases, and the waste receiving surface 18 on the rear side of the bowl section 6 can be thoroughly cleaned (flow of washing water F6).

[0045] Next, the operation and effects of the flush toilet 1 according to this embodiment described above will be explained.

[0046] First, in the flush toilet bowl 1 according to this embodiment, the shelf portion 22 is provided around the entire circumference of the bowl portion 6, and in a plan view, the first width W1 of the shelf portion 22 is minimized in the first region A1 where the outer edge 22a of the shelf portion 22 has the smallest first radius of curvature R1. Therefore, in the first region A1, where the flushing water is affected by centrifugal force and has difficulty flowing down to the waste receiving surface 18, the flushing water swirling on the shelf portion 22 can flow down to the waste receiving surface 18, and the waste receiving surface 18 can be cleaned thoroughly.

[0047] In the flush toilet 1 according to this embodiment, the rim spout 10 is provided on the left side (or right side) of the bowl portion 6 and is configured to discharge flushing water forward. The second width W2 of the shelf portion 22 on the left side (or right side) of the bowl portion 6 where the rim spout 10 is provided is formed to be larger than the third width W3 of the shelf portion 22 on the right side (or left side). This prevents the flushing water from falling onto the waste receiving surface 18 immediately after being discharged from the rim spout 10 and allows it to swirl around on the shelf portion 22.

[0048] Furthermore, in the flush toilet 1 according to this embodiment, the second width W2 and third width W3 of the shelf portion 22 are formed to be approximately constant in the second region where the outer edge 22a of the shelf portion 22 has the maximum second radius of curvature R2 in a plan view. Therefore, in the second region, the flushing water can be swirled on the shelf portion 22 while suppressing it from falling onto the waste receiving surface 18.

[0049] In the flush toilet 1 according to this embodiment, the fourth width W4 and fifth width W5 of the shelf portion 22 are formed in the third region A3 between the first region A1 and the second region A2 such that they gradually become smaller as they approach the first region A1 from the second region A2. Therefore, in the third region A3, the amount of flushing water swirling on the shelf portion 22 and the amount of flushing water flowing down to the waste receiving surface 18 can be adjusted, allowing the waste receiving surface 18 to be thoroughly cleaned.

[0050] Furthermore, in the flush toilet 1 according to this embodiment, a first region A1 is formed on the front side of the bowl portion 6, where the outer edge 22a of the shelf portion 22 has the smallest first radius of curvature R1 in a plan view, and a second region A2 is formed on the left and right sides of the bowl portion 6, where the outer edge 22a of the shelf portion 22 has the largest second radius of curvature R2 in a plan view. Therefore, in the first region A1 on the front side of the bowl portion 6, the flushing water swirling on the shelf portion 22 can flow down to the waste receiving surface 18, and the waste receiving surface 18 can be thoroughly cleaned.

[0051] In the flush toilet 1 according to this embodiment, the sixth width W6 of the shelf portion 22 in the rear side (fourth region A4) of the bowl portion 6 is larger than the first width W1 of the shelf portion 22 in the first region A1, and smaller than the second width W2 and third width W3 of the shelf portion 22 in the second region A2. This increases the amount of flushing water that flows down to the waste receiving surface 18 on the rear side of the bowl portion 6, making it possible to clean the rear side of the bowl portion 6 where waste tends to adhere.

[0052] The present invention is not limited to the embodiments described above, and various modifications and variations are possible within the scope of the technical idea described in the claims. [Explanation of Symbols]

[0053] 1: Flush toilet 2: Toilet bowl 6: Bowl section 8: Drain trap pipe 8a: Inlet of drain trap pipe 10: Rim spout 12: Rim water conduit 18: Waste receiving surface 20: Rim section 20a: Inner circumferential surface of the rim 22:Shelf 22a: Outer edge of the shelf section 22b: Inner edge of shelf section 22c: Shelf surface of the shelf section 24: Acupressure points R1~R4: 1st radius of curvature ~ 4th radius of curvature A1~A4: 1st area ~ 4th area W1~W6: Shelf section, widths 1 to 6 F1~F6: Flow of cleaning water

Claims

1. A flush toilet that uses flushing water to wash away waste, A bowl portion comprising a waste receiving surface for receiving waste, a rim portion formed above the waste receiving surface, a shelf portion formed between the waste receiving surface and the rim portion, and a pot portion formed below the waste receiving surface with a water reservoir inside, A drain trap pipe is connected below this bowl section for discharging waste, One rim outlet is provided on the rim portion and discharges cleaning water along the inner circumferential surface of the rim portion to form a swirling flow, It has, The above shelf section is provided around the entire circumference of the above bowl section. A flush toilet characterized in that, in a plan view, the width of the shelf portion is minimized in a first region where the outer edge of the shelf portion has the minimum radius of curvature.

2. The rim outlet described above is provided on either the left or right side of the bowl portion and is configured to discharge cleaning water forward. The flush toilet according to claim 1, wherein the width of the shelf on one of the left and right sides of the bowl portion, where the rim spout is provided, is formed to be greater than the width of the shelf on the other side.

3. The flush toilet according to claim 2, wherein the width of the shelf portion is formed to be substantially constant in the second region where the outer edge of the shelf portion has the largest radius of curvature in a plan view.

4. The flush toilet according to claim 3, wherein the width of the shelf portion is formed such that in the third region between the first region and the second region, it gradually decreases as it approaches the first region from the second region.

5. The flush toilet according to claim 3 or 4, wherein a first region is formed on the front side of the bowl portion, where the outer edge of the shelf portion has the smallest radius of curvature in a plan view, and a second region is formed on the left and right sides of the bowl portion, where the outer edge of the shelf portion has the largest radius of curvature in a plan view.

6. The flush toilet according to claim 5, wherein the width of the shelf portion on the rear side of the bowl portion is formed to be greater than the width of the shelf portion in the first region and smaller than the width of the shelf portion in the second region.

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