Toilet bowl

Abstract

To provide a toilet bowl in which droplets are less likely to fly outside of a toilet bowl part.SOLUTION: There is provided a toilet bowl 1 in which, in a cross-sectional shape cut by a vertical plane including a first imaginary line L1 linearly extending from a front end 11X of the upper edge of a rising surface 11 toward a rim portion 50 ahead of the front end 11X of the upper edge of the rising surface 11 in plan view, an inclination angle of a toilet bowl surface 31 forward of the front end 11X of the upper edge of the rising surface 11 is 20 degrees or less, an inclination angle of an inner surface of the rim portion 50 forward of the front end 11X of the upper edge of the rising surface 11 is 80 degrees or more, and an inclination angle of a connecting surface 33 forward of the front edge 11X of the top edge of the rising surface 11 is an angle between the inclination angle of the toilet bowl surface 31 forward of the front edge 11X of the top edge of the standing rising 11 in the same cross-sectional shape and the inclination angle of the inner surface of the rim portion 50.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to toilet bowls. [Background technology]

[0002] Patent Document 1 discloses a conventional toilet bowl. This toilet bowl has a water collection section, a toilet bowl section, and a rim section. The toilet bowl section has a toilet bowl surface and a shelf surface. The toilet bowl surface is continuous with the upper end of the surface of the water collection section. The toilet bowl surface is inclined diagonally upward toward the outside. The shelf surface is continuous with the upper end of the toilet bowl surface and is inclined slightly upward toward the outside. The inner surface of the rim section rises vertically from the outer periphery of the shelf surface. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-160670 Summary of the Invention [Problem to be solved by the invention]

[0004] The toilet disclosed in Patent Document 1 has a toilet bowl surface with an inclination angle of approximately 50 degrees, which means that droplets of urine and other liquids that hit the toilet bowl surface and splash forward and upward tend to splash outward over the rim.

[0005] The present disclosure has been made in consideration of the above-mentioned conventional situation, and aims to solve the problem of providing a toilet bowl that is less likely to cause droplets of urine, etc. to splash outward beyond the rim portion. [Means for solving the problem]

[0006] The toilet bowl of the present disclosure comprises a water collection section having an upright surface, a toilet bowl section that is continuous with the upper edge of the water collection section, and a rim section that is continuous with the upper edge of the toilet bowl section, and the toilet bowl section has a toilet bowl surface that is continuous with the upper edge of the upright surface, and a connecting surface that connects the upper edge of the toilet bowl surface to the lower edge of the inner surface of the rim section, and in a plan view seen from above, in a cross section cut by a vertical plane that includes an imaginary line that extends straight from the front end of the upper edge of the upright surface toward the rim section forward of the front end of the upper edge of the upright surface, the angle of inclination of the toilet bowl surface forward of the front end of the upper edge of the upright surface is 20 degrees or less, the angle of inclination of the inner surface of the rim section forward of the front end of the upper edge of the upright surface is 80 degrees or more, and the angle of inclination of the connecting surface forward of the front end of the upper edge of the upright surface is the angle between the angle of inclination of the toilet bowl surface forward of the front end of the upper edge of the upright surface and the angle of inclination of the inner surface of the rim section in the same cross section.

[0007] The inclination angle of the toilet bowl surface is the angle between the toilet bowl surface and a horizontal line extending below the toilet bowl surface and outside the toilet bowl in a cross section cut by a vertical plane including the imaginary line.The inclination angle of the inner surface of the rim is the angle between the inner surface of the rim and a horizontal line extending below the inner surface of the rim and outside the rim in a cross section cut by a vertical plane including the imaginary line.The inclination angle of the connecting surface is the angle between the connecting surface and a horizontal line extending below the connecting surface and outside the toilet bowl in a cross section cut by a vertical plane including the imaginary line. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a plan view showing a toilet bowl of the first embodiment. [Figure 2] FIG. 2 is a partial cross-sectional view taken along the arrow AA in FIG. [Figure 3] 2 is a cross-sectional view taken along the line AA in FIG. 1, showing a main part of the first cross-sectional shape. [Figure 4] 1. FIG. 5 is a cross-sectional view taken along the arrow BB in FIG. 1, showing a main part of the second cross-sectional shape. [Figure 5] 1. FIG. 4 is a cross-sectional view taken along the line CC in FIG. 1, showing a main part of a third cross-sectional shape. [Figure 6] 1. FIG. 6 is a cross-sectional view taken along the line DD in FIG. 1, showing a main part of a fourth cross-sectional shape. [Figure 7] 1. FIG. 6 is a cross-sectional view taken along the line EE in FIG. 1, showing a main part of the fifth cross-sectional shape. [Figure 8] FIG. 1 is a plan view showing a toilet bowl of the first embodiment. [Figure 9] 9 is a cross-sectional view taken along the line FF in FIG. 8, showing the cross-sectional shape of the first rim. [Figure 10] 9 is a cross-sectional view taken along the line GG in FIG. 8, showing the cross-sectional shape of the second rim. [Figure 11] 9 is a cross-sectional view taken along the line HH in FIG. 8, showing a third rim cross-sectional shape. [Figure 12] FIG. 10 is a cross-sectional view showing a first cross-sectional shape of a toilet bowl according to a second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] [1] The toilet bowl of the present disclosure comprises a water collection section having a standing surface, a toilet bowl section that is continuous with the upper edge of the water collection section, and a rim section that is continuous with the upper edge of the toilet bowl section, and the toilet bowl section has a toilet bowl surface that is continuous with the upper edge of the standing surface, and a connecting surface that connects the upper edge of the toilet bowl surface to the lower edge of the inner surface of the rim section, and in a plan view seen from above, in a cross section cut by a vertical plane that includes an imaginary line that extends straight from the front end of the upper edge of the standing surface toward the rim section forward of the front end of the upper edge of the standing surface, the angle of inclination of the toilet bowl surface forward of the front end of the upper edge of the standing surface is 20 degrees or less, the angle of inclination of the inner surface of the rim section forward of the front end of the upper edge of the standing surface is 80 degrees or more, and the angle of inclination of the connecting surface forward of the front end of the upper edge of the standing surface is the angle between the angle of inclination of the toilet bowl surface forward of the front end of the upper edge of the standing surface and the angle of inclination of the inner surface of the rim section in the same cross section. [2] A toilet bowl as described in [1] above, wherein the length of the toilet bowl surface in the cross-sectional shape is longer than the length of the connecting surface in the same cross-sectional shape forward of the front end of the upper edge of the standing surface. [3] A toilet bowl according to either of [1] and [2] above, wherein the length of the toilet bowl surface in the cross-sectional shape, forward of the front end of the upper edge of the upright surface, is longer than the vertical length of the inner surface of the rim portion in the same cross-sectional shape. [4] A toilet according to any one of [1] to [3] above, wherein more than half of the inner surface of the rim portion in the cross-sectional shape is linear. [5] A toilet according to any one of [1] to [4] above, wherein more than half of the inner surface of the rim portion in the cross-sectional shape has an inclination angle of 90 degrees or more forward of the front end of the upper edge of the standing surface. [6] A toilet bowl according to any one of [1] to [5] above, wherein the imaginary line is a first imaginary line, and in a plan view from above, the entire area sandwiched between a pair of second imaginary lines extending straight forward from each of the left and right ends of the upper edge of the standing surface of the water storage section and a pair of first imaginary lines passing through two points where the upper inner edge of the rim section intersects is composed of the toilet bowl surface, the connecting surface, and the inner surface of the rim section. [7] In the toilet bowls described in [1] to [6] above, the angle obtained by subtracting the inclination angle of the inner surface of the rear side of the rim portion from 180 degrees is greater than the inclination angle of the inner surface of the front side of the rim portion. [8] In the toilets described in [1] to [7] above, in the area from the connecting surface to the inner surface of the rim portion forward of the front end of the upper edge of the upright surface, the reverse gradient area sloping inward toward the top is wider than the normal gradient area sloping outward toward the top. [9] A toilet according to any of [1] to [8] above, wherein in the area from the connecting surface to the inner surface of the rim portion, which is forward of the front end of the upper edge of the standing surface and in which the inner surface of the rim portion is formed as a reverse gradient area sloping inward toward the top, the ratio of the area of the normal gradient area sloping outward toward the top to the area of the reverse gradient area is 1:4 to 1:1.

[10] In a toilet bowl according to either of [8] and [9] above, the gradually sloping region of the connecting surface forward of the front end of the upper edge of the standing surface has a vertical length that is shorter than its horizontal length.

[11] In any of the toilets [1] to

[10] above, in a plan view from above of the rim portion, the inner surface of which is formed in a reverse gradient area sloping inward toward the top, the cross-sectional shape cut by a vertical plane perpendicular to the outer edge of the rim portion is an area surrounded by a vertical imaginary line hanging straight down in the vertical direction from the inner edge of the upper end of the inner surface of the rim portion, the inner surface of the rim portion and the connecting surface, and the area above the horizontal imaginary line extending straight horizontally from the boundary between the normal gradient area sloping outward toward the top and the reverse gradient area is larger than the area below.

[12] A toilet bowl according to any one of [8] to

[11] above, which is provided with a jet spout that spouts flushing water toward the toilet drainage channel, and in the reverse slope area of the inner surface of the rim portion, the inclination angle is between 90 degrees and 110 degrees.

[13] A toilet bowl according to any one of [1] to

[12] above, wherein the rim portion has an inner wall portion that forms the inner surface of the rim portion and an outer wall portion that forms the outer surface of the rim portion.

[14] The toilet bowl according to

[13] above, wherein an inner rim space is formed between the inner wall portion and the outer wall portion, the inner rim space being connected to a space formed below the toilet bowl portion.

[15] A toilet bowl according to any one of [1] to

[14] above, having a rim spout formed in the rim portion that spouts flushing water behind the front end of the upper edge of the standing surface of the water storage portion.

[16] The toilet bowl of

[15] above, wherein the toilet bowl is shaped so that no step is formed on the upper surface along which flush water discharged from the rim spout flows.

[0010] Embodiments 1 and 2 embodying the toilet of the present disclosure will be described with reference to the drawings. In the following description, the up-down direction refers to the up-down direction when the toilet is installed. The front-to-rear direction refers to the direction in which the flushing device is attached to the toilet bowl when the toilet is installed, with the opposite direction being the front. The left-to-right direction refers to the left-to-right direction when the toilet is installed as seen from the front. In Figures 1 and 2, the up direction is the positive direction of the X-axis, the down direction is the negative direction of the X-axis, the front direction is the positive direction of the Z-axis, the rear direction is the negative direction of the Z-axis, the left direction is the positive direction of the Y-axis, and the right direction is the negative direction of the Y-axis.

[0011] <Embodiment 1> As shown in Figures 1 and 2, the toilet bowl 1 of embodiment 1 comprises a water collection section 10, a toilet bowl 30, a rim 50, a toilet drainage channel 70, and a peripheral wall 90. The water collection section 10 forms a recess that is recessed downward from the bottom of the toilet bowl 30. As shown in Figure 1, when viewed from above the toilet bowl 1 in a plan view (hereinafter referred to as "plan view"), the water collection section 10 has a shape that is close to an ellipse that is long in the front-to-rear direction. When viewed in a plan view, the radius of curvature of the front end of the water collection section 10 is smaller than the radius of curvature of the rear end of the water collection section 10.

[0012] As shown in Figures 2 and 3, the water collection section 10 has a rising surface 11 and a bottom surface 13. The rising surface 11 is cylindrical. The upper edge of the rising surface 11 gradually becomes higher toward the rear. The upper edge of the rising surface 11 is a curved surface whose inclination angle gradually decreases from bottom to top in a cross section of the water collection section 10 cut by a vertical plane. Hereinafter, the cross section cut by a vertical plane will be referred to as the "vertical cross section." The inclination angle of the rising surface 11 is the angle between the rising surface 11 and a horizontal line extending below the rising surface 11 and outside the water collection section 10 in the vertical cross section of the water collection section 10. The lower edge of the rising surface 11 is a curved surface whose inclination angle gradually increases from bottom to top in the vertical cross section of the water collection section 10. The rising surface 11 extends linearly from the lower side of the upper edge to the upper side of the lower edge in the vertical cross section of the water collection section 10. "Straight" includes things that are not perfectly straight, but are slightly curved (the same applies below).

[0013] As shown in Figures 2 and 3, the outer peripheral edge of the bottom surface 13 is continuous with the lower edge of the upright surface 11. The outer peripheral edge of the bottom surface 13 is a curved surface that is continuous with the lower edge of the upright surface 11. An opening 13A is formed at the rear of the bottom surface 13. The rear edge of the opening 13A is continuous with the rear of the upright surface 11 in plan view, as shown in Figure 1. As shown in Figures 2 and 3, in the vertical cross-sectional shape of the water collection section 10, the bottom surface 13 extends linearly, sloping slightly downward from the inside of the outer peripheral edge toward the opening 13A. The bottom surface 13 extends downward below the water collection level WL, which will be described later. The opening 13A of the bottom surface 13 faces downward and is connected to the upstream end of the toilet drainage channel 70.

[0014] As shown in FIG. 2, the toilet drainage channel 70 has an inlet channel 71, an ascending channel 73, and a descending channel 75. The upstream end of the inlet channel 71 is connected to the opening 13A in the bottom surface 13 of the reservoir section 10. The inlet channel 71 is curved overall, extending diagonally downward toward the rear while gradually changing from a downward direction to a rearward direction. The downstream end of the inlet channel 71 faces rearward. The ascending channel 73 extends diagonally upward toward the rear. The upstream end of the ascending channel 73 is connected to the downstream end of the inlet channel 71. The upstream portion of the ascending channel 73 extends in a curved manner, gradually changing from a rearward direction to a diagonally upward direction toward the rear. The middle portion of the ascending channel extends straight diagonally upward toward the rear. The downstream portion of the ascending channel extends in a curved manner, gradually changing from a diagonally upward direction toward the rear toward the rear. The upstream end of the ascending channel 73 faces rearward.

[0015] The upstream end of the descending passage 75 communicates with the downstream end of the ascending pipe. The descending passage 75 extends downward. The upstream section of the descending passage 75 extends in a curve, gradually changing from facing backward to facing downward. The downstream side of the upstream section of the descending passage 75 extends straight downward. The downstream end of the descending passage 75 faces downward. The pooling section 10, inlet passage 71 and ascending passage 73 form a drain trap in which flush water accumulates and blocks the flow path. The level of the flush water when flush water accumulates in the pooling section 10, inlet passage 71 and ascending passage 73 is the pooled water level WL.

[0016] As shown in Figure 3, the lower edge of the toilet bowl portion 30 is continuous with the upper edge of the water collection portion 10. The toilet bowl portion 30 has a toilet bowl surface 31 and a connecting surface 33. The toilet bowl surface 31 and the connecting surface 33 are symmetrical. A symmetrical shape does not necessarily mean a perfect symmetry, but also includes a shape that is slightly asymmetrical (the same applies below). The lower edge of the toilet bowl surface 31 is continuous with the upper edge of the standing surface 11 of the water collection portion 10. The lower edge of the toilet bowl surface 31 is a curved surface that is continuous with the upper edge of the standing surface 11 of the water collection portion 10, and the angle of inclination gradually decreases from bottom to top. The area where the upper edge of the standing surface 11 and the lower edge of the toilet bowl surface 31 are continuous is a curved surface whose angle of inclination gradually decreases from the standing surface 11 side toward the toilet bowl surface 31. The middle part of this curved surface is the upper edge of the standing surface 11. As shown in Figure 1, the front end 11X of the upper edge of the standing surface 11 is located on a straight line passing through the center of the left and right of the toilet bowl 1 in a plan view. The toilet bowl surface 31 slopes diagonally upward outward from the upper side of the lower edge. In the vertical cross section of the toilet bowl 30, the toilet bowl surface 31 extends in a straight line from the upper side of the lower edge toward the upper edge.

[0017] The lower edge of the connecting surface 33 is continuous with the upper edge of the toilet bowl surface 31. The connecting surface 33 is a curved surface whose inclination angle gradually increases from the lower edge to the upper edge. The radius of the curved surface of the connecting surface 33 is 15 mm to 30 mm on average. The upper edge of the connecting surface 33 is continuous with the lower edge of the inner surface 51A of the inner wall portion 51 of the rim portion 50, which will be described later.

[0018] The rim portion 50 has an inner wall portion 51, an upper wall portion 53, and an outer wall portion 55. The upper edge of the inner wall portion 51 is continuous with the inner edge of the upper wall portion 53. The lower edge of the inner wall portion 51 is continuous with the upper edge of the toilet bowl portion 30. The inner wall portion 51 of the rim portion 50 surrounds the periphery of the toilet bowl portion 30 in a band shape, above the toilet bowl portion 30. The rim portion 50 has a rim spout 100 for spouting flush water formed at the rear, to the left of the center (see Figure 1). The rim spout 100 is open in the front-to-rear direction. The rim spout 100 is formed behind the water collection portion 10.

[0019] The inner wall portion 51 extends in the vertical direction in the vertical cross-sectional shape of the rim portion 50. The lower edge of the inner surface 51A of the inner wall portion 51 is continuous with the upper edge of the connecting surface 33 of the toilet bowl portion 30. The inner surface 51A of the inner wall portion 51 has a bilaterally symmetrical shape. The inner surface 51A of the inner wall portion 51 is the inner surface of the rim portion 50. The upper edge of the inner surface 51A of the inner wall portion 51 is a curved surface whose inclination angle gradually decreases from bottom to top. The upper edge of the inner surface 51A of the inner wall portion 51 is a gently sloping region that slopes outward toward the top. The inner surface 51A of the inner wall portion 51 from the lower side of the upper edge to the lower edge extends linearly in the vertical direction in the vertical cross-sectional shape of the rim portion 50.

[0020] The upper wall portion 53 extends horizontally. The inner edge of the upper surface of the upper wall portion 53 is continuous with the upper edge of the inner surface 51A of the inner wall portion 51. The inner edge of the upper surface of the upper wall portion 53 is a curved surface that is continuous with the upper edge of the inner surface 51A of the inner wall portion 51. The outer edge of the upper surface of the upper wall portion 53 is a curved surface. In the vertical cross-sectional shape of the rim portion 50, the upper surface of the upper wall portion 53 extends linearly horizontally from the outside of the inner edge to the inside of the outer edge.

[0021] The outer wall portion 55 extends in the vertical direction. The upper edge of the outer wall portion 55 is continuous with the outer edge of the upper wall portion 53. The outer wall portion 55 is located outboard of the inner wall portion 51. The outer surface of the outer wall portion 55 is the outer surface of the rim portion 50. The vertical length of the outer wall portion 55 is approximately the same as the vertical length of the inner wall portion 51. A rim-intra-space 50S is formed between the outer wall portion 55 and the inner wall portion 51. The rim-intra-space 50S is connected to the space 30S formed below the toilet bowl portion 30. The upper edge of the outer surface of the outer wall portion 55 is continuous with the outer edge of the upper surface of the upper wall portion 53. The upper edge of the outer surface of the outer wall portion 55 is a curved surface that is continuous with the outer edge of the upper surface of the upper wall portion 53.

[0022] The lower edge of the outer wall 55 is continuous with the upper edge of the peripheral wall 90. The peripheral wall 90 curves and extends rearward, widening in the left-right direction from the front end of the toilet 1 so as to surround the toilet bowl 30. The peripheral wall 90 widens downward from the upper edge. The lower edge of the peripheral wall 90 comes into contact with the installation surface when the toilet 1 is installed on the installation surface.

[0023] In plan view, as shown in Figure 1, the first imaginary line L1 is a straight line extending from the front end 11X of the upper edge of the standing surface 11 of the water collection section 10 toward the rim section 50 forward of the front end 11X of the upper edge of the standing surface 11. In plan view, the cross-sectional shape cut by a vertical plane including the first imaginary line L1, which overlaps with the line passing through the center of the toilet bowl 1 from left to right, is referred to as the "first cross-sectional shape" (see Figure 3).

[0024] As shown in FIG. 3 , in the first cross-sectional shape, the inclination angle α1 of the linearly extending region of the toilet bowl surface 31 forward of the front end 11X of the upper edge of the standing surface 11 is approximately 20 degrees. In the first cross-sectional shape, the inclination angle β1 of the linearly extending region of the inner surface 51A of the inner wall portion 51 forward of the front end 11X of the upper edge of the standing surface 11 is approximately 95 degrees. This region is formed to have a reverse gradient region that slopes inward toward the top. In the first cross-sectional shape, the inclination angle γ1 of the connecting surface 33 forward of the front end 11X of the upper edge of the standing surface 11 gradually increases from approximately 20 degrees to approximately 95 degrees from the lower edge to the upper edge. This connecting surface 33 is formed to have a gently sloping region that slopes outward toward the top, and a reverse gradient region above the gently sloping region.

[0025] As shown in FIG. 3 , in the first cross-sectional shape, the inclination angle X1 of the toilet bowl surface 31 behind the water collecting section 10 is approximately 20 degrees. In the first cross-sectional shape, the inclination angle Y1 of the inner surface 51A of the inner wall portion 51 behind the water collecting section 10 is approximately 84 degrees. This inner surface 51A of the inner wall portion 51 is formed to form a gently sloping region that slopes upward and outward. In the first cross-sectional shape, the inclination angle Y1 of the inner surface 51A of the inner wall portion 51 behind the water collecting section 10 is smaller than the inclination angle β1 of the inner surface 51A of the inner wall portion 51 forward of the front end 11X of the upper edge of the upright surface 11, which is approximately 95 degrees. In the first cross-sectional shape, the connecting surface 33 behind the water collecting section 10 is curved. The inclination angle Z1 of this connecting surface 33 gradually increases from approximately 20 degrees to approximately 84 degrees from the lower edge to the upper edge. This connecting surface 33 is formed to form a gently sloping region.

[0026] As shown in FIG. 3 , the length of the toilet bowl surface 31 in the first cross-sectional shape is longer than the length of the connecting surface 33 forward of the front end 11X of the upper edge of the standing surface 11. The length of the toilet bowl surface 31 in the first cross-sectional shape is longer than the vertical length of the inner surface 51A of the inner wall portion 51 forward of the front end 11X of the upper edge of the standing surface 11. The inner surface 51A of the inner wall portion 51 in the first cross-sectional shape has a curved upper edge and extends linearly from the lower side of the upper edge to the lower edge. The linearly extending region of the inner surface 51A of the inner wall portion 51 in the first cross-sectional shape accounts for most of the inner surface 51A of the inner wall portion 51. Forward of the front end 11X of the upper edge of the standing surface 11, the connecting surface 33 in the first cross-sectional shape and the inner surface 51A of the inner wall portion 51 have a longer reverse-gradient region than a normally-gradient region. In front of the front end 11X of the upper edge of the standing surface 11, the gently sloping region of the connecting surface 33 of the first cross-sectional shape has a vertical length that is shorter than a horizontal length.

[0027] In a plan view, as shown in Figure 1, the cross-sectional shape cut by a vertical plane including a first imaginary line L1 passing through the midpoint between the point where a straight line passing through the center of the toilet bowl 1 intersects with the upper inner edge of the inner wall portion 51 of the rim portion 50 and the point where a second imaginary line L2 extending straight forward from the left end of the upper edge of the standing surface 11 of the water storage portion 10 intersects is called the "second cross-sectional shape" (see Figure 4).

[0028] As shown in FIG. 4, in the second cross-sectional shape, the inclination angle α2 of the linearly extending region of the toilet bowl surface 31 forward of the front end 11X of the upper edge of the standing surface 11 is approximately 20 degrees. In the second cross-sectional shape, the inclination angle β2 of the linearly extending region of the inner surface 51A of the inner wall portion 51 forward of the front end 11X of the upper edge of the standing surface 11 is approximately 95 degrees. This region is formed to be a reverse-gradient region. In the second cross-sectional shape, the inclination angle γ2 of the connecting surface 33 forward of the front end 11X of the upper edge of the standing surface 11 gradually increases from approximately 20 degrees to approximately 95 degrees from the lower edge to the upper edge. This connecting surface 33 is formed to be a gently sloping region and a reverse-gradient region above the gently sloping region.

[0029] 4, in the second cross-sectional shape, the inclination angle Y2 of the inner surface 51A of the inner wall portion 51 rearward of the water collecting portion 10 is approximately 84 degrees. The inner surface 51A of this inner wall portion 51 is formed to be a gently sloping region. In the second cross-sectional shape, the inclination angle Y2 of the inner surface 51A of the inner wall portion 51 rearward of the water collecting portion 10 is smaller than the inclination angle β2 of approximately 95 degrees of the inner surface 51A of the inner wall portion 51 forward of the front end 11X of the upper edge of the standing surface 11.

[0030] As shown in FIG. 4, the length of the toilet bowl surface 31 in the second cross-sectional shape is longer than the length of the connecting surface 33 forward of the front end 11X of the upper edge of the standing surface 11. The length of the toilet bowl surface 31 in the second cross-sectional shape is longer than the vertical length of the inner surface 51A of the inner wall portion 51 forward of the front end 11X of the upper edge of the standing surface 11. The inner surface 51A of the inner wall portion 51 in the second cross-sectional shape has a curved upper edge and extends linearly from the lower side of the upper edge to the lower edge. The linearly extending region of the inner surface 51A of the inner wall portion 51 in the second cross-sectional shape accounts for most of the inner surface 51A of the inner wall portion 51. Forward of the front end 11X of the upper edge of the standing surface 11, the connecting surface 33 in the second cross-sectional shape and the inner surface 51A of the inner wall portion 51 have a longer reverse-gradient region than a normally-gradient region. In front of the front end 11X of the upper edge of the standing surface 11, the gently sloping region of the connecting surface 33 of the second cross-sectional shape has a vertical length that is shorter than its horizontal length.

[0031] In plan view, as shown in Figure 1, the cross-sectional shape cut by a vertical plane including a first virtual line L1 passing through the upper inner edge of the inner wall portion 51 of the rim portion 50, at the point where the second virtual line L2 extending straight forward from the left end of the upper edge of the standing surface 11 of the water storage portion 10 intersects with the first virtual line L1 (see Figure 5).

[0032] As shown in FIG. 5, in the third cross-sectional shape, the inclination angle α3 of the linearly extending region of the toilet bowl surface 31 forward of the front end 11X of the upper edge of the standing surface 11 is approximately 20 degrees. In the third cross-sectional shape, the inclination angle β3 of the linearly extending region of the inner surface 51A of the inner wall portion 51 forward of the front end 11X of the upper edge of the standing surface 11 is approximately 95 degrees. This region is formed to be a reverse-gradient region. In the third cross-sectional shape, the inclination angle γ3 of the connecting surface 33 forward of the front end 11X of the upper edge of the standing surface 11 gradually increases from approximately 20 degrees to approximately 95 degrees from the lower edge to the upper edge. This connecting surface 33 is formed to be a gently sloping region and a reverse-gradient region above the gently sloping region.

[0033] 5, in the third cross-sectional shape, the inclination angle Y3 of the inner surface 51A of the inner wall portion 51 rearward of the water collecting portion 10 is approximately 84 degrees. The inner surface 51A of this inner wall portion 51 is formed to be a gently sloping region. In the third cross-sectional shape, the inclination angle Y3 of the inner surface 51A of the inner wall portion 51 rearward of the water collecting portion 10 is smaller than the inclination angle β3 (approximately 95 degrees) of the inner surface 51A of the inner wall portion 51 forward of the front end 11X of the upper edge of the standing surface 11.

[0034] As shown in FIG. 5 , the length of the toilet bowl surface 31 in the third cross-sectional shape is longer than the length of the connecting surface 33 forward of the front end 11X of the upper edge of the standing surface 11. The length of the toilet bowl surface 31 in the third cross-sectional shape is longer than the vertical length of the inner surface 51A of the inner wall portion 51 forward of the front end 11X of the upper edge of the standing surface 11. The inner surface 51A of the inner wall portion 51 in the third cross-sectional shape has a curved upper edge and extends linearly from the lower side of the upper edge to the lower edge. The linearly extending region of the inner surface 51A of the inner wall portion 51 in the third cross-sectional shape accounts for most of the inner surface 51A of the inner wall portion 51. Forward of the front end 11X of the upper edge of the standing surface 11, the connecting surface 33 and the inner surface 51A of the inner wall portion 51 in the third cross-sectional shape have a longer reverse-gradient region than a normally-gradient region. In front of the front end 11X of the upper edge of the standing surface 11, the gently sloping region of the connecting surface 33 of the third cross-sectional shape has a vertical length that is shorter than its horizontal length.

[0035] In a plan view, as shown in Figure 1, the cross-sectional shape cut by a vertical plane including a first virtual line L1 passing through the midpoint between the upper inner edge of the inner wall portion 51 of the rim portion 50, where a second virtual line L2 extending straight forward from the left end of the upper edge of the standing surface 11 of the water storage portion 10 intersects, and a line extending leftward from the front end 11X of the upper edge of the standing surface 11 of the water storage portion 10, perpendicular to a line passing through the center of the left and right sides of the toilet bowl 1, intersects (see Figure 6).

[0036] As shown in FIG. 6 , in the fourth cross-sectional shape, the inclination angle α4 of the linearly extending region of the toilet bowl surface 31 forward of the front end 11X of the upper edge of the standing surface 11 is approximately 20 degrees. In the fourth cross-sectional shape, the inclination angle β4 of the linearly extending region of the inner surface 51A of the inner wall portion 51 forward of the front end 11X of the upper edge of the standing surface 11 is approximately 93 degrees. This region is formed to be a reverse-gradient region. In the fourth cross-sectional shape, the inclination angle γ4 of the connecting surface 33 forward of the front end 11X of the upper edge of the standing surface 11 gradually increases from approximately 20 degrees to approximately 93 degrees from the lower edge to the upper edge. This connecting surface 33 is formed to be a gently sloping region and a reverse-gradient region above the gently sloping region.

[0037] As shown in Figure 6, in the fourth cross-sectional shape, the inclination angle Y4 of the inner surface 51A of the inner wall portion 51 rearward of the water collecting portion 10 is approximately 86 degrees. The inner surface 51A of this inner wall portion 51 is formed to be a gently sloping region. In the fourth cross-sectional shape, the inclination angle Y4 of the inner surface 51A of the inner wall portion 51 rearward of the water collecting portion 10 is smaller than the inclination angle β4 (approximately 93 degrees) of the inner surface 51A of the inner wall portion 51 forward of the front end 11X of the upper edge of the standing surface 11.

[0038] As shown in FIG. 6 , the length of the toilet bowl surface 31 in the fourth cross-sectional shape is longer than the length of the connecting surface 33 forward of the front end 11X of the upper edge of the standing surface 11. The length of the toilet bowl surface 31 in the fourth cross-sectional shape is longer than the vertical length of the inner surface 51A of the inner wall portion 51 forward of the front end 11X of the upper edge of the standing surface 11. The inner surface 51A of the inner wall portion 51 in the fourth cross-sectional shape has a curved upper edge and extends linearly from the lower side of the upper edge to the lower edge. The linearly extending region of the inner surface 51A of the inner wall portion 51 in the fourth cross-sectional shape accounts for most of the inner surface 51A of the inner wall portion 51. Forward of the front end 11X of the upper edge of the standing surface 11, the connecting surface 33 and the inner surface 51A of the inner wall portion 51 in the fourth cross-sectional shape have a longer reverse-gradient region than a normally-gradient region. In front of the front end 11X of the upper edge of the standing surface 11, the gently sloping region of the connecting surface 33 of the fourth cross-sectional shape has a vertical length that is shorter than its horizontal length.

[0039] In plan view, as shown in Figure 1, the cross-sectional shape cut by a vertical plane including a line extending left and right from the front end 11X of the upper edge of the standing surface 11 of the water storage section 10, perpendicular to the line passing through the center of the left and right of the toilet bowl 1, is called the "fifth cross-sectional shape" (see Figure 7).

[0040] As shown in FIG. 7, the toilet bowl 30, rim 50, and peripheral wall 90 are bilaterally symmetrical in the fifth cross-sectional shape. In the fifth cross-sectional shape, the inclination angle α5 of the linearly extending regions of the toilet bowl surface 31 on both the left and right sides is approximately 20 degrees. In the fifth cross-sectional shape, the inclination angle β5 of the linearly extending regions of the inner surfaces 51A of the inner wall portions 51 on both the left and right sides is approximately 87 degrees. This region is formed to be a gently sloping region. In the fifth cross-sectional shape, the inclination angle γ5 of the connecting surfaces 33 on both the left and right sides gradually increases from approximately 20 degrees to approximately 87 degrees from the lower edge to the upper edge. This connecting surface 33 is formed to be a gently sloping region.

[0041] As shown in Figures 2 to 7, the toilet bowl surface 31 of the toilet bowl 30 does not have a horizontally wide step, but rather extends linearly from the lower end of the connecting surface 33 toward the water collection section 10. The linearly extending region of the inner surface 51A of the inner wall 51 of the rim 50 is formed as a reverse-gradient region from the first cross-sectional shape to the fourth cross-sectional shape, as shown in Figures 3 to 6, and is formed as a normal-gradient region in the fifth cross-sectional shape, as shown in Figure 7. The linearly extending region of the inner surface 51A of the inner wall 51 changes from a reverse-gradient region to a normal-gradient region between the fourth cross-sectional shape and the fifth cross-sectional shape. In a cross-sectional shape cut by a vertical plane at the portion where the reverse-gradient region is formed, the horizontal distance between the upper and lower ends of the reverse-gradient region is less than one-third of the horizontal width of the upper surface of the rim 50.

[0042] In plan view, as shown in FIG. 8, the cross-sectional shape of the rim portion 50 cut by a vertical plane that passes through the front end of the outer edge of the rim portion 50 located on a line passing through the left-to-right center of the toilet bowl 1 and is perpendicular to the outer edge of the rim portion 50 is referred to as the "first rim cross-sectional shape" (see FIG. 9). In plan view, the cross-sectional shape of the rim portion 50 cut by a vertical plane that passes through the upper inner edge of the inner wall portion 51 of the rim portion 50, at the point where a second imaginary line L2 extending straight forward from the left end of the upper edge of the standing surface 11 of the water collection section 10 intersects, and is perpendicular to the outer edge of the rim portion 50 is referred to as the "second rim cross-sectional shape" (see FIG. 10). The cross-sectional shape of the rim portion 50 cut by a vertical plane that is rearward of the second rim cross-sectional shape and perpendicular to the outer edge of the rim portion 50 forward of the part where the linearly extending region of the inner surface 51A of the inner wall portion 51 changes from a reverse gradient region to a forward gradient region is referred to as the "third rim cross-sectional shape" (see FIG. 11).

[0043] In the first rim cross-sectional shape, second rim cross-sectional shape and third rim cross-sectional shape, as shown in Figures 9 to 11, the area surrounded by a third virtual line L3, which is a vertical virtual line hanging straight down in the vertical direction from the inner edge of the upper end of the inner surface 51A of the inner wall portion 51, which is the inner surface of the rim portion 50, and the inner surface 51A of the inner wall portion 51 and the connecting surface 33, and the area above a fourth virtual line L4, which is a horizontal virtual line extending straight in the horizontal direction from the boundary K between the forward gradient region and the reverse gradient region, is larger than the area below.

[0044] As explained above, the toilet bowl 1 of embodiment 1 comprises a water collection section 10, a toilet bowl section 30, and a rim section 50. The water collection section 10 has a standing surface 11. The toilet bowl section 30 is continuous with the upper edge of the water collection section 10. The rim section 50 is continuous with the upper edge of the toilet bowl section 30. The toilet bowl section 30 has a toilet bowl surface 31 that is continuous with the upper edge of the standing surface 11, and a connecting surface 33 that connects the upper edge of the toilet bowl surface 31 with the lower edge of the inner surface of the rim section 50. As shown in the first to fourth cross-sectional shapes, in a plan view of the toilet bowl 1 from above, in the cross-sectional shapes cut by a vertical plane including a first imaginary line L1 that extends in a straight line from the front end 11X of the upper edge of the standing surface 11 toward the rim portion 50 forward of the front end 11X of the upper edge of the standing surface 11, the inclination angles α1 to α4 of the toilet bowl surface 31 forward of the front end 11X of the upper edge of the standing surface 11 are approximately 20 degrees, the inclination angles β1 to β4 of the inner surface of the rim portion 50 forward of the front end 11X of the upper edge of the standing surface 11 are approximately 93 to 95 degrees, and the inclination angles γ1 to γ4 of the connecting surface 33 forward of the front end 11X of the upper edge of the standing surface 11 are the angles between the inclination angles of the toilet bowl surface 31 forward of the front end 11X of the upper edge of the standing surface 11 and the inclination angle of the inner surface of the rim portion 50 for the same cross-sectional shape. The inclination angle of the toilet bowl surface 31 may be 20 degrees or less, and the inclination angle of the inner surface of the rim portion 50 may be 80 degrees or more.

[0045] When a person urinates while seated on the toilet 1, urine collides with the toilet bowl surface 31 forward of the front end 11X of the upper edge of the standing surface 11 of the water collection section 10. In particular, when viewed from above in a plan view of the toilet 1, urine collides with the area R (see Figure 1) sandwiched between a pair of second imaginary lines L2 extending straight forward from each of the left and right ends of the upper edge of the standing surface 11 of the water collection section 10 and a pair of first imaginary lines L1 passing through two points where the upper inner edge of the rim section 50 intersect.

[0046] In the toilet 1 of embodiment 1, the angle of inclination of the toilet bowl surface 31 forward of the front end 11X of the upper edge of the standing surface 11 of the water collection section 10 is approximately 20 degrees. As a result, when urinating while seated, urine that hits the toilet bowl surface 31 does not splash high upwards, but instead hits the inner surface of the rim section 50. In this way, this toilet 1 is less likely to cause droplets of urine to splash outward beyond the rim section 50.

[0047] As shown in the first to fourth cross-sectional shapes, the length of the toilet bowl surface 31 in a cross-sectional shape, forward of the front end 11X of the upper edge of the standing surface 11 of the water collection section 10, is longer than the length of the connecting surface 33 in the same cross-sectional shape. In this toilet bowl 1, by making the toilet bowl surface 31, which has an inclination angle of approximately 20 degrees, longer than the connecting surface 33, the connecting surface 33 becomes smaller, and the distance between the connecting surface 33 and the inner surface 51A of the inner wall 51 becomes shorter. As a result, in this toilet bowl 1, droplets that strike the connecting surface 33 strike the inner surface 51A of the inner wall 51, making it less likely that droplets of urine or the like will splash outward beyond the rim 50.

[0048] The horizontal width of the connecting surface 33 is less than half the width of the upper wall portion 53 of the rim portion 50. In a plan view from above, the lower end of the connecting surface 33 is located outside the inner peripheral edge of the opening of the toilet seat (not shown) and is concealed by the toilet seat. In a plan view from above, the lower end of the connecting surface 33 is located outside the upper end of the inner surface 51A of the inner wall portion 51 formed in the reverse slope region and is preferably concealed by the upper wall portion 53 of the rim portion 50.

[0049] As shown in the first to fourth cross-sectional shapes, the length of the toilet bowl surface 31 in the cross-sectional shape, forward of the front end 11X of the upper edge of the standing surface 11 of the water collection section 10, is longer than the vertical length of the inner surface of the rim section 50 in the same cross-sectional shape. By making the toilet bowl surface 31, which has an inclination angle of approximately 20 degrees, longer than the vertical length of the inner surface of the rim section 50, this toilet bowl 1 makes it less likely that droplets of urine or the like will splash outward beyond the rim section 50, and the smaller inner surface of the rim section 50 makes it easier to flush.

[0050] As shown in the first to fourth cross-sectional shapes, the inner surface of rim portion 50 in cross section extends almost entirely in a straight line forward of front end 11X of the upper edge of upright surface 11, with inclination angles β1 to β4 of this linear region being approximately 93 to 95 degrees. If at least half of the inner surface of rim portion 50 is straight, it can be easily cleaned. If at least half of the inner surface of rim portion 50 is inclined at an angle of 90 degrees or more, droplets of urine or the like that collide with the inner surface of rim portion 50 can be repelled toward toilet bowl 30, making it more difficult for droplets of urine or the like to splash outward beyond rim portion 50.

[0051] As shown in the first to fourth cross-sectional shapes, the angle obtained by subtracting each of the inclination angles Y1 to Y4 of the inner surface on the rear side of the rim portion 50 from 180 degrees is greater than the inclination angles β1 to β4 of the inner surface on the front side of the rim portion 50 for the same cross-sectional shapes. When this toilet 1 is manufactured by slip casting, the casting mold placed inside the rim portion 50 can be easily removed. Note that if the inner surface on the rear side of the rim portion 50 is formed with a sloped surface with a reverse gradient, the relationship between the inclination angle of the inner surface on the front side of the rim portion 50 and the inclination angle of the inner surface on the rear side will be reversed in order to allow for easy removal of the casting mold.

[0052] As shown in the first to fourth cross-sectional shapes, in the region from the connecting surface 33 to the inner surface of the rim portion 50 forward of the front end 11X of the upper edge of the standing surface 11, the reverse gradient region sloping upward and inward is wider than the normal gradient region sloping upward and outward. In the region from the connecting surface 33 to the inner surface of the rim portion 50 forward of the front end 11X of the upper edge of the standing surface 11, in the portion formed as the reverse gradient region, the ratio of the area of the normal gradient region to the area of the reverse gradient region is 1:4 to 1:1. The ratio of the area of this normal gradient region to the area of the reverse gradient region may also be 1:2 to 1:1. This toilet 1 is able to bounce droplets of urine or the like that collide with the reverse gradient region back toward the toilet bowl 30, making it less likely that droplets of urine or the like will splash outward beyond the rim portion 50.

[0053] As shown in the first to fourth cross-sectional shapes, the gently sloping region of the connecting surface 33 forward of the front end 11X of the upper edge of the standing surface 11 has a vertical length that is shorter than its horizontal length. In this toilet 1, urine and other droplets that collide with the connecting surface 33 bounce back toward the toilet bowl 30, making it less likely that droplets of urine and other droplets will splash outward beyond the rim 50.

[0054] As shown in the first to third rim cross-sectional shapes, in a cross-section taken along a vertical plane perpendicular to the outer edge of the rim portion 50 in a plan view of the toilet bowl 1 viewed from above, the area enclosed by a third imaginary line L3 hanging straight down vertically from the inner edge of the upper end of the inner surface of the rim portion 50, and the inner surface of the rim portion 50 and connecting surface 33, is larger in area above a fourth imaginary line L4 extending straight horizontally from the boundary K between the forward gradient area and the reverse gradient area than below. This toilet bowl 1 is able to bounce back, toward the toilet bowl 30, droplets of urine and the like that collide with the inner surface area of the rim portion 50 from connecting surface 33 of the reverse gradient area, which is located above the forward gradient area, and prevent droplets of urine and the like from splashing outward beyond the rim portion 50.

[0055] The rim portion 50 has an inner wall portion 51 that forms the inner surface of the rim portion 50, and an outer wall portion 55 that forms the outer surface of the rim portion 50, and an intra-rim space 50S that communicates with the space formed below the toilet bowl 30 is formed between the inner wall portion 51 and the outer wall portion 55. In this toilet bowl 1, the shape of the inner surface of the rim portion 50 can be formed without being affected by the shape of the outer surface of the rim portion 50, so it is easy to form the inner surface of the rim portion 50 in a shape that makes it difficult for droplets of urine, etc. to splash outward beyond the rim portion 50.

[0056] This toilet 1 has a rim spout 100 formed in the rim portion 50 that spouts flush water behind the front end 11X of the upper edge of the standing surface 11 of the water collection portion 10. With this toilet 1, urine does not flow into the rim spout 100 when a person urinates while seated.

[0057] The toilet bowl 30 has a shape that does not have a step on the top surface over which flush water discharged from the rim spout 100 flows. Because this toilet bowl 1 does not have a step, flush water can swirl smoothly over the toilet bowl surface 31 to provide a clean flush.

[0058] <Embodiment 2> As shown in Figure 12, the toilet bowl 2 of embodiment 2 is equipped with a jet water spout 110. Components similar to those of embodiment 1 are given the same reference numerals and will not be described further. The jet water spout 110 is provided on the upstream side of the toilet drainage channel 70. This toilet bowl 1 is equipped with a rim water spout (not shown). In this toilet bowl 1, in its first cross-sectional shape, the angle of inclination of the linearly extending area of the inner surface 51A of the inner wall portion 51 of the rim portion 50 is approximately 96 degrees, and is formed as a reverse gradient area.

[0059] This toilet 2 discharges a large amount of flush water from the jet spout 110, and therefore discharges a small amount of flush water from the rim spout. Therefore, flush water must be discharged from the rim spout at a faster flow rate than in a toilet without a jet spout. Also, because the flow rate is likely to be faster in a flushing system that has a pressurized water supply source, the flush water discharged from the rim spout is more likely to splash out than in a toilet without a pressurized water supply source. In this toilet 2, the inclination angle is 90 to 110 degrees in the reverse gradient region of the inner surface 51A of the inner wall portion 51, which is the inner surface of the rim portion 50, and this makes it easy to see the inner surface 51A of the inner wall portion 51 of the rim portion 50, while avoiding the flush water being discharged from the rim spout at a high flow rate from splashing out.

[0060] The present disclosure is not limited to the first and second embodiments described above with reference to the drawings, and the following embodiments are also included within the technical scope. (1) In the toilet bowl of the first embodiment, the angle of inclination of the toilet bowl surface forward of the front end of the upper edge of the standing surface was approximately 20 degrees. However, this is not limited to this, and the angle of inclination of the toilet bowl surface may be less than 20 degrees. (2) In the toilet bowl of embodiment 1, the angle of inclination of the rim portion forward of the front end of the upper edge of the standing surface was approximately 93 to 95 degrees. However, this is not limited to this, and the angle of inclination of the rim portion may be 80 degrees or more. (3) In the toilets of embodiments 1 and 2, the connecting surface is a curved surface. However, the connecting surface is not limited to this, and may be a flat surface that slopes diagonally upwards facing outward. (4) In the toilets of embodiments 1 and 2, the inner surface of the rim extends in a straight line. However, this is not limiting, and the inner surface of the rim may also be curved. (5) In the toilet bowl of embodiment 1, the area from the connecting surface forward of the front end of the upper edge of the standing surface to the inner surface of the rim is wider in the reverse gradient area than in the normal gradient area. However, this is not limited to this, and the area from the connecting surface to the inner surface of the rim in this part may be wider in the normal gradient area than in the reverse gradient area, or there may be no reverse gradient area. (6) In the toilets of embodiments 1 and 2, the rim portion has an inner wall portion and an outer wall portion. However, this is not limiting, and the rim portion may be formed from a single wall. (7) In the toilet bowl of embodiment 1, the rim spout is open facing forward. However, this is not limiting, and the rim spout may be open facing rearward. (8) In the toilet bowl of embodiment 1, the rim spout is formed at the rear of the rim portion. This is not a limitation, and the rim spout may be formed behind the front end of the upper edge of the standing surface of the water collection portion. (9) Even in a toilet that spouts flush water only from the rim spout, the angle of inclination in the reverse slope area on the inner surface of the rim may be between 90 degrees and 110 degrees.

[0061] (10) The toilet flushing device that supplies flush water to the toilet may be either a tank type that supplies flush water stored in a flush tank, or a direct water supply type that supplies flush water directly from a water supply source. The toilet flushing device may also use a jet pump (ejector) to pressurize the flush water and supply it to the toilet. (11) The connecting surface is not limited to one continuous curved surface, but may be formed by a plurality of surfaces. (12) When viewed from above in a plan view of the toilet, the step portion need not be formed in at least the area sandwiched between a pair of second imaginary lines extending straight forward from each of the left and right ends of the upper edge of the standing surface of the water storage portion and a pair of first imaginary lines passing through two points where the upper inner edge of the rim portion intersects, but may be formed in other areas. (13) The toilet bowl surface may have a step with an inclination angle of 20 degrees or less. (14) The rim spout may be one that spouts flush water rearward. In this case, it is preferable that the rim spout is located forward of the rear end of the water storage section. Furthermore, in this case, it is even more preferable that the rim spout is located between the rear and front ends of the water storage section. [Explanation of symbols]

[0062] 1,2...toilet bowl, 10...water collection section, 11...standing surface, 11X...front end of upper edge of standing surface, 30...toilet bowl section, 31...toilet bowl surface, 33...connecting surface, 50...rim section, 50S...space inside the rim, 51...inner wall section (of the rim section), 51A...inner surface, 55...outer wall section, 100...rim spout, 110...jet spout, L1...first imaginary line, L2...second imaginary line, L3...third imaginary line, L4...fourth imaginary line, α1,α2,α3,α4,α5...tilt angle of toilet bowl surface, β1,β2,β3,β4,β5...tilt angle of inner surface of rim section, γ1,γ2,γ3,γ4,γ5...tilt angle of connecting surface

Claims

[Claim 1] a water reservoir having a standing surface; a toilet bowl portion continuous with the upper edge portion of the water collecting portion; a rim portion continuous with the upper edge portion of the toilet bowl; It is equipped with The toilet bowl portion has a toilet bowl surface that is continuous with the upper edge of the standing surface, and a connecting surface that connects the upper edge of the toilet bowl surface and the lower edge of the inner surface of the rim portion, In a plan view seen from above, in a cross-sectional shape cut by a vertical plane including an imaginary line extending straight from the front end of the upper edge of the standing surface to the rim portion forward of the front end of the upper edge of the standing surface, The inclination angle of the toilet bowl surface forward of the front end of the upper edge of the standing surface is 20 degrees or less, The inclination angle of the inner surface of the rim portion forward of the front end of the upper edge of the standing surface is 80 degrees or more, A toilet bowl in which the inclination angle of the connecting surface forward of the front end of the upper edge of the standing surface is the angle between the inclination angle of the toilet bowl surface forward of the front end of the upper edge of the standing surface and the inclination angle of the inner surface of the rim portion for the same cross-sectional shape.

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