toilet

Abstract

To provide a toilet bowl which gets washing water to flow into a recess from a specific location to enable smooth discharge of dirt.SOLUTION: A toilet bowl 1 comprises an excreta bowl 10 that consists of a rim part 20 having a rim internal surface 21A, a bowl part 60 having a dirt-receiving surface 60A, a first connection part 40 having a first connection surface 40A, and a recess 90 arranged at the lower part. The first connection surface 40A in the rear side region of the first connection part 40 comprises: a center connection surface 47 that, in a plan view, extends between a pair of virtual parallel lines P1, P1 which extend in parallel to the longitudinal center line CL1 of the excreta bowl 10 from the right and left ends WR, WL of the reserved-water surface WS formed in the recess 90; and a right-and-left connection surface 49 that extends laterally outwards from the right and left edges of the center connection surface 47. In a vertical section profile along the vertical plane passing the center 10C of the excreta 10 in a plan view, the inclination angle of the center connection surface 47 is greater than the inclination angle of the right-and-left connection surface 49.SELECTED DRAWING: Figure 1

Description

Technical Field

[0004] , , , , ,

[0001] This disclosure relates to a toilet bowl.

Background Art

[0002] Patent Document 1 discloses a conventional toilet bowl. This toilet bowl includes a bowl part. The bowl part includes a rim part, a bowl part, and a recess. The rim part forms a first water outlet on the left rear side and a second water outlet on the right front side. The bowl part has a shelf surface and a waste receiving surface. The shelf surface is continuous with the outer peripheral edge of the waste receiving surface except for a part in the front. The outer peripheral edge of the shelf surface is continuous with the lower end edge of the inner peripheral surface of the rim of the rim part. The recess is continuous with the inner peripheral edge of the waste receiving surface. The washing water discharged from the first water outlet forms a first water flow and a second water flow. The first water flow flows into the recess from the rear. The second water flow passes through the shelf surface located behind the recess, washes the waste receiving surface on the right side, and swirls counterclockwise. The washing water discharged from the second water outlet forms a third water flow and a fourth water flow. The third water flow flows into the recess from the front. The fourth water flow swirls counterclockwise and merges with the washing water discharged from the first water outlet. A part of the fourth water flow flows into the recess from the rear. The rest of the fourth water flow merges with the second water flow, passes through the shelf surface located behind the recess, washes the waste receiving surface on the right side, and swirls counterclockwise.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the toilet disclosed in Patent Document 1, a shelf surface is formed behind the recess, so the flushing water discharged from the first and second spouts easily passes behind the recess and swirls. Therefore, if the flow rate or water pressure of the flushing water discharged from the first and second spouts is high, the swirling water flow inside the toilet bowl becomes stronger, making it difficult for a large amount of flushing water to flow into the recess from the rear, which may result in poor waste discharge.

[0005] This disclosure has been made in view of the above-mentioned conventional circumstances, and aims to solve the problem of providing a toilet in which cleaning water flows into a recess from a predetermined position and waste can be discharged effectively. [Means for solving the problem]

[0006] The toilet bowl of the present disclosure comprises a rim portion having an inner rim wall surface, a bowl portion having a waste receiving surface, a connecting portion having a connecting surface whose upper edge is continuous with the lower edge of the inner rim wall surface and whose lower edge is continuous with the upper edge of the waste receiving surface, and a recess provided at the bottom, wherein the connecting surface in the rear region of the connecting portion has, in a plan view, a central connecting surface that extends between a pair of imaginary parallel lines extending parallel to the left and right centerlines of the toilet bowl portion from both the left and right ends of the water-retaining surface formed in the recess, and left and right connecting surfaces that extend outward to the left and right from both left and right end edges of the central connecting surface, and in a vertical cross-sectional shape cut by a vertical plane passing through the center of the toilet bowl portion in a plan view, the inclination angle of the central connecting surface is steeper than the inclination angles of the left and right connecting surfaces.

[0007] The water level is the water level of the water seal stored in the toilet bowl when the toilet is not being flushed. The left and right ends of the water level are the outer edges of the water level, which are the parts furthest from the left and right centerlines of the toilet bowl. In a plan view, the center of the toilet bowl is the point where the left and right centerlines and the front and rear centerlines intersect with respect to the upper opening of the toilet bowl. The upper edge of the inner wall surface of the rim corresponds to the edge of the upper opening of the toilet bowl. [Brief explanation of the drawing]

[0008] [Figure 1]This is a plan view showing a toilet in Embodiment 1. [Figure 2] This is a cross-sectional view showing the DD section as seen through the arrow in Figure 1. [Figure 3] This is a cross-sectional view showing the EE section in the direction of the arrow in Figure 1. [Figure 4] This is a cross-sectional perspective view showing the DD section as seen through the arrow in Figure 1. [Figure 5] This is a cross-sectional view showing the main part of section AA as seen by the arrow in Figure 1. [Figure 6] This is a cross-sectional view showing the main part of the BB section as seen by the arrow in Figure 1. [Figure 7] This is a cross-sectional view showing the main part of the CC section as directed by the arrow in Figure 1. [Figure 8] This is a cross-sectional view showing the main part of the DD section as seen by the arrow in Figure 1. [Figure 9] This is a perspective view showing the flow of cleaning water inside the toilet bowl. [Modes for carrying out the invention]

[0009] Embodiment 1 of the toilet bowl 1 of the present disclosure will be described with reference to the drawings. In the following description, the vertical direction is the vertical direction when the toilet bowl 1 is installed on a horizontal surface. The front-rear direction is when the toilet bowl 1 is installed on a horizontal surface, with the direction in which the tank mounting section 130 is provided relative to the toilet bowl section 10 being the rear, and the opposite direction being the front. The left-right direction is when the toilet bowl 1 is installed on a horizontal surface, with reference to the front. In Figures 1 to 4, the upward direction is the positive direction of the X-axis, the downward direction is the negative direction of the X-axis, the forward direction is the positive direction of the Z-axis, the backward 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.

[0010] <Embodiment 1> As shown in Figures 1 to 4, the toilet bowl 1 of Embodiment 1 comprises a toilet bowl portion 10, a toilet bowl drain channel 110, an upper wall portion 120, a tank mounting portion 130, and a peripheral wall portion 140. The toilet bowl 1 is made of integrally molded ceramic. The toilet bowl portion 10 is provided in the following order from the upper end downwards: a rim portion 20, a first connecting portion 40, a bowl portion 60, a second connecting portion 80, and a recess 90.

[0011] The rim portion 20 has an inner rim wall portion 21 and an upper rim wall portion 23. The rim portion 20 constitutes the upper end of the toilet bowl portion 10. The inner rim wall portion 21 encircles the upper part of the toilet bowl portion 10. The inner rim wall surface 21A is the inward-facing surface of the inner rim wall portion 21 and is a band that encircles the upper part of the toilet bowl portion 10. As shown in Figure 1, the upper periphery of the inner rim wall surface 21A is approximately elliptical in plan view, with the radius of curvature at the front end being smaller than the radius of curvature at the rear end. As shown in Figures 2 and 3, the upper end of the inner rim wall surface 21A is a curved surface that gradually becomes steeper downwards. The upper periphery of the inner rim wall surface 21A is the upper edge of the curved surface formed at the upper end of the inner rim wall surface 21A. The upper periphery of the inner rim wall surface 21A corresponds to the periphery of the upper opening 10A of the toilet bowl portion 10. The inner rim wall surface 21A below the curved upper end is slightly inclined inward toward the downward.

[0012] As shown in Figures 1 to 3, the rear part of the inner rim wall 21 constitutes the front wall 22 of the water supply space 150S, which will be described later. The inner rim wall 21 has a circumferentially long rim outlet 25 formed to the left of the center of the rear part. The rim outlet 25 penetrates the inner rim wall 21 in the front-to-back direction. The cleaning water discharged from the cleaning water pipe 150, which will be described later, within the water supply space 150S is discharged from the rim outlet 25 into the toilet bowl 10.

[0013] The rim upper wall portion 23 is continuous with the upper peripheral edge of the rim inner wall portion 21 and extends outward. The rim upper wall portion 23 encircles the upper peripheral edge of the rim inner wall portion 21. The rim upper wall surface 23A is the surface facing upward of the rim upper wall portion 23 and is a horizontally extending annular plane. In plan view, the rim upper wall surface 23A is symmetrical with respect to the left-right center line CL1 of the toilet bowl portion 10. The width of the rim upper wall surface 23A increases slightly from both the left and right sides towards the front end.

[0014] As shown in FIGS. 1 to 8, the first connecting portion 40 is continuous with the lower end peripheral edge portion of the rim inner wall portion 21. The first connecting portion 40 extends around along the lower end peripheral edge of the rim inner wall portion 21. The first connecting surface 40A is a surface facing the inner direction of the first connecting portion 40. The first connecting surface 40A has a symmetric shape with respect to the vertical plane including the left - right center line CL1 of the toilet bowl portion 10.

[0015] The upper end edge of the first connecting surface 40A extends around at substantially the same height along the lower end peripheral edge of the rim inner wall portion 21. The upper end edge of the first connecting surface 40A extends at a higher position than any part of the lower end edge of the first connecting surface 40A. The lowermost end of the upper end edge of the first connecting surface 40A is located above the uppermost end of the lower end edge of the first connecting surface 40A. The rear end of the upper end edge of the first connecting surface 40A extends to the highest position. The rear end of the lower end edge of the first connecting surface 40A extends to the lowest position.

[0016] As shown in FIGS. 1 and 2, the first connecting surface 40A in the front region of the first connecting portion 40 has an upper connecting surface 41, an intermediate connecting surface 43, and a lower connecting surface 45. The left and right both ends in the front region of the first connecting portion 40 are continuous with the front end portion of the front - rear central region of the first connecting portion 40. The first connecting portion 40 in the front - rear central region extends in the front - rear direction on both left and right sides of the toilet bowl portion 10. The left and right both end edges of the upper connecting surface 41 are continuous with the first connecting surface 40A in the front - rear central region of the first connecting portion 40. The first connecting surface 40A in the front - rear central region of the first connecting portion 40 has a substantially constant width in plan view.

[0017] As shown in FIGS. 1 to 8, each of the rear end portions in the front - rear central region of the first connecting portion 40 is continuous with the left and right both end portions in the rear region of the first connecting portion 40. The first connecting surface 40A in the rear region of the first connecting portion 40 gradually widens in width from the left and right both end portions toward the left - right central portion in plan view. The lower end edge of the first connecting surface 40A in the rear region of the first connecting portion 40 curves so as to bulge downward, and the left - right center is the lowest (see FIGS. 3 and 4).

[0018] As shown in FIG. 1, the first connecting surface 40A in the rear region of the first connecting portion 40 has a central connecting surface 47 and left and right connecting surfaces 49 that extend outward in the left and right directions from both left and right edges of the central connecting surface 47. The central connecting surface 47 extends between a pair of virtual parallel lines P1, P1 that are parallel to the left and right center line CL1 of the toilet bowl portion 10 from both left and right ends WL, WR of the water storage surface WS formed in the recess 90 described later in a plan view. The left and right ends WL, WR of the water storage surface WS are the outer peripheral edges of the water storage surface WS and are the portions that are the farthest from the left and right center line CL1 of the toilet bowl portion 10 in the left and right directions.

[0019] It is a vertical cross-sectional shape (hereinafter referred to as "vertical cross-sectional shape") cut by a vertical plane passing through the center 10C of the toilet bowl portion 10 in a plan view. In the vertical cross-sectional shape, the inclination angle of the left and right connecting surfaces 49 in the A-A cross-sectional view of FIG. 1 is about 43.0 degrees (see FIG. 5). The center 10C of the toilet bowl portion 10 in a plan view is the point where the left and right center line CL1 and the front and rear center line CL2 intersect with respect to the upper end opening 10A of the toilet bowl portion 10. The inclination angle of the left and right connecting surfaces 49 is the inclination angle of the straight line connecting the upper end edge 49T and the lower end edge 49L of the left and right connecting surfaces 49 in the vertical cross-sectional shape.

[0020] In the vertical cross-sectional shape, the inclination angle of the central connecting surface 47 in the B-B cross-sectional view of FIG. 1 is about 44.6 degrees (see FIG. 6). In the vertical cross-sectional shape, the inclination angle of the central connecting surface 47 in the C-C cross-sectional view of FIG. 1 is about 47.8 degrees (see FIG. 7). In the vertical cross-sectional shape, the inclination angle of the central connecting surface 47 in the D-D cross-sectional view of FIG. 1 is about 48.9 degrees (see FIG. 8). The inclination angle of the central connecting surface 47 is the inclination angle of the straight line connecting the upper end edge 47T and the lower end edge 47L of the central connecting surface 47 in the vertical cross-sectional shape.

[0021] The first connecting surface 40A is symmetrical with respect to the vertical plane containing the left and right centerlines CL1 of the toilet bowl portion 10. Therefore, the first connecting surface 40A in the rear region of the first connecting portion 40 has a gradually steeper inclination angle in the vertical cross-sectional shape from both left and right edges toward the left and right centers. In the vertical cross-sectional shape, the inclination angle of the central connecting surface 47 is steeper than the inclination angles of the left and right connecting surfaces 49. The change in inclination angle from the central connecting surface 47 of the vertical cross-sectional shape (arrow BB in Figure 1) to the central connecting surface 47 of the vertical cross-sectional shape (arrow CC in Figure 1) is greater than the change in inclination angle from the left and right connecting surfaces 49 of the vertical cross-sectional shape (arrow AA in Figure 1) to the central connecting surface 47 of the vertical cross-sectional shape (arrow BB in Figure 1), and the change in inclination angle from the central connecting surface 47 of the vertical cross-sectional shape (arrow CC in Figure 1) to the central connecting surface 47 of the vertical cross-sectional shape (arrow DD in Figure 1). In other words, the first connecting surface 40A in the rear region of the first connecting portion 40 exhibits a greater change in the inclination angle of its cross-sectional shape in the region closer to the virtual parallel line P1 than to the left-right center.

[0022] As shown in Figures 5 to 8, the first connecting surface 40A of the rear region of the first connecting portion 40 has a vertical cross-sectional shape in which the length gradually increases from both the left and right sides toward the left and right center. The radius of curvature in the vertical cross-sectional shape of the first connecting surface 40A of the rear region of the first connecting portion 40 changes between the upper edges 47T, 49T and the lower edges 47L, 49L of the first connecting surface 40A. The radius of curvature in the vertical cross-sectional shape of the first connecting surface 40A of the rear region of the first connecting portion 40 is taken as the average value of the radius of curvature of the first connecting surface 40A between the upper edges 47T, 49T and the lower edges 47L, 49L of the first connecting surface 40A of the rear region of the first connecting portion 40. In this case, the radius of curvature in the vertical cross-sectional shape of the first connecting surface 40A of the rear region of the first connecting portion 40 gradually increases from both the left and right sides toward the left and right center.

[0023] As shown in Figures 1 to 8, the bowl portion 60 is continuous with the lower peripheral edge of the first connecting portion 40. The waste receiving surface 60A is the surface of the bowl portion 60 facing inward and upward from the toilet bowl portion 10, and it widens by sloping diagonally downward and inward from the outer peripheral edge. The waste receiving surface 60A is symmetrical with respect to the vertical plane containing the left-right center line CL1 of the toilet bowl portion 10.

[0024] As shown in Figure 1, the waste receiving surface 60A in the rear region of the bowl portion 60 has, in a plan view, a central waste receiving surface 61 that extends between a pair of virtual parallel lines P1,P1, and left and right waste receiving surfaces 63 that extend outward from both left and right edges of the central waste receiving surface 61. The upper edge 61T of the central waste receiving surface 61 is continuous with the lower edge 47L of the central connecting surface 47, as shown in Figures 6 to 8. The upper edges 63T of the left and right waste receiving surfaces 63 are continuous with the lower edges 49L of the left and right connecting surfaces 49.

[0025] In the vertical cross-sectional shape, the inclination angle of the left and right waste receiving surfaces 63 in the cross-sectional area AA as seen by arrow 1 is approximately 26.8 degrees (see Figure 5). The inclination angle of the left and right waste receiving surfaces 63 is the inclination angle of the straight line connecting the upper edge 63T and the lower edge 63L of the left and right waste receiving surfaces 63 in the vertical cross-sectional shape.

[0026] In a vertical cross-sectional shape, the inclination angle of the central waste receiving surface 61 in the BB section as seen by arrow 1 is approximately 32.6 degrees (see Figure 6). In a vertical cross-sectional shape, the inclination angle of the central waste receiving surface 61 in the CC section as seen by arrow 1 is approximately 34.1 degrees (see Figure 7). In a vertical cross-sectional shape, the inclination angle of the central waste receiving surface 61 in the DD section as seen by arrow 1 is approximately 34.5 degrees (see Figure 8). The inclination angle of the central waste receiving surface 61 is the inclination angle of the straight line connecting the upper edge 61T and the lower edge 61L of the central waste receiving surface 61 in a vertical cross-sectional shape.

[0027] The waste receiving surface 60A is symmetrical with respect to the vertical plane containing the left and right centerlines CL1 of the toilet bowl portion 10. Therefore, in the rear region of the toilet bowl portion 60, the angle of inclination in the vertical cross-sectional shape of the waste receiving surface 60A gradually increases from the left and right edges toward the left and right center. In the vertical cross-sectional shape, the angle of inclination of the central waste receiving surface 61 is steeper than the angle of inclination of the left and right waste receiving surfaces 63.

[0028] As shown in Figures 3 to 8, the waste receiving surface 60A in the rear region of the bowl portion 60 slopes forward from the upper edge to the lower edge, and also slopes downward from both the left and right edges towards the left and right center. The lower edge of the waste receiving surface 60A in the rear region of the bowl portion 60 curves downward, with the left and right center being the lowest (see Figures 3 and 4).

[0029] The second connecting portion 80 is continuous with the lower end periphery of the bowl portion 60. The second connecting portion 80 encircles the lower end periphery of the bowl portion 60. The second connecting surface 80A is the surface of the second connecting portion 80 facing inward towards the toilet bowl portion 10. The second connecting surface 80A curves and widens from the upper end periphery downward inward, with the angle of inclination gradually becoming steeper. The second connecting surface 80A is symmetrical with respect to the vertical plane containing the left-right center line CL1 of the toilet bowl portion 10.

[0030] As shown in Figures 2 to 4, the recess 90 has a side wall portion 91 and a bottom wall portion 93. The side wall portion 91 of the recess 90 is continuous with the lower end peripheral edge of the second connecting portion 80. The side wall surface 91A of the recess 90 is the surface of the side wall portion 91 that faces inward towards the recess 90 and encircles the lower part of the toilet bowl portion 10. As shown in Figure 1, in a plan view, the side wall surface 91A of the recess 90 has a substantially elliptical shape in which the radius of curvature at the front end is smaller than the radius of curvature at the rear end. The side wall surface 91A of the recess 90 is slightly inclined inward toward downward.

[0031] The bottom wall portion 93 of the recess 90 is continuous with the lower end peripheral edge of the side wall portion 91 of the recess 90. The bottom wall portion 93 of the recess 90 has an outlet 95 formed at its rear that communicates with the toilet drain channel 110. The bottom wall surface 93A of the recess 90 is the surface facing upward of the bottom wall portion 93 and is slightly inclined downward toward the outlet 95.

[0032] As shown in Figure 2, the toilet drain channel 110 has its upstream end continuous with the lower end of the recess 90 of the toilet bowl 10 and communicates with an outlet 95 formed in the bottom wall 93 of the recess 90. The upstream part of the toilet drain channel 110, together with the lower part of the recess 90 of the toilet bowl 10, forms a water reservoir W. The water reservoir W is the part where the water seal is stored. The water reservoir level WS is located slightly above the bottom wall surface 93A of the recess 90. The downstream end of the toilet drain channel 110 is connected to the upstream end of a drainage connection pipe (not shown). The downstream end of the drainage connection pipe is connected to a drainage pipe that opens to the floor surface (not shown).

[0033] As shown in Figures 1 and 2, the upper wall portion 120 extends rearward from the rim upper wall portion 23 of the rim portion 20 of the toilet bowl portion 10. The upper wall portion 120 has a pair of toilet seat mounting bolt holes 121 formed therein, which are used for attaching a toilet seat device (not shown). The upper wall surface 120A of the upper wall portion 120, facing upward, extends on the same plane as the rim upper wall surface 23A. Below the upper wall portion 120, a water supply space 150S is formed to house the flushing water pipe 150. The upper end of the drainage channel 150D is connected to the lower front end of the water supply space 150S. The lower end of the drainage channel 150D is connected to the water reservoir W.

[0034] The tank mounting section 130 is located behind the upper wall section 120. The tank mounting section 130 is for mounting a toilet flushing tank (not shown). The tank mounting section 130 has a recess formed below the mounted toilet flushing tank for positioning the upstream end of the flushing water pipe 150. The flushing water pipe 150 is bifurcated and extends from the tank mounting section 130 into the water supply space 150S. The inlet 150A formed at the upstream end of the flushing water pipe 150 opens upward. The two first outlets 150R and 2nd outlets 150L formed at the downstream end of the flushing water pipe 150 open within the water supply space 150S. The first outlet 150R opens to the right of the second outlet 150L. The inlet 150A of the flushing water pipe 150 is connected to the flushing water outlet of the toilet flushing tank, which is mounted on the tank mounting section 130.

[0035] The peripheral wall portion 140 has a front peripheral wall portion 140A that extends downward from the outer peripheral edge of the rim upper wall portion 23 of the rim portion 20 at the front of the toilet bowl 1, and a rear peripheral wall portion 140B that extends downward from the upper and lower middle portion at the rear of the toilet bowl 1 and is continuous with the left and right rear end edges of the front peripheral wall portion 140A. When the toilet bowl 1 is installed on the installation surface, the lower end surfaces of the front peripheral wall portion 140A and the rear peripheral wall portion 140B are in contact with the installation surface.

[0036] When the toilet bowl 1 is flushed, as shown in Figure 9, a portion of the flushing water discharged from the first outlet 150R and the flushing water discharged from the second outlet 150L of the flushing water pipe 150 merge and are discharged into the toilet bowl 10 from the rim outlet 25. The flushing water discharged from the first outlet 150R forms a first main stream F1 that swirls around the inner rim wall surface 21A inside the toilet bowl 10. The flushing water discharged from the second outlet 150L forms a second main stream F2 that flows directly into the recess 90 from the rear from the rim outlet 25. Once the first main stream F1 has completed one circuit around the toilet bowl 10, it flows into the recess 90 from the rear together with the second main stream F2.

[0037] In this toilet bowl 1, the first connecting surface 40A in the rear region of the first connecting section 40 and the waste receiving surface 60A in the rear region of the bowl 60 have a gradually steeper inclination angle in the vertical cross-sectional shape from both left and right edges toward the left and right center. Furthermore, in this toilet bowl 1, the waste receiving surface 60A in the rear region of the bowl 60 inclins forward from the upper edge toward the lower edge, and also inclins downward from both left and right edges toward the left and right center. As a result, in this toilet bowl 1, the first main stream F1, which is discharged from the rim outlet 25 and travels around the inside of the toilet bowl 10 along the inner wall surface 21A of the rim, changes into a flow that flows into the recess 90 from the rear in the rear region of the first connecting section 40 and the bowl 60. In this toilet bowl 1, since the first main stream F1 and the second main stream F2 flow into the recess 90 from the rear, waste can be discharged efficiently.

[0038] As described above, the toilet bowl 1 of Embodiment 1 comprises a rim portion 20 having an inner rim wall surface 21A, a bowl portion 60 having a waste receiving surface 60A, a first connecting portion 40 having a first connecting surface 40A whose upper edge is continuous with the lower edge of the inner rim wall surface 21A and whose lower edge is continuous with the upper edge of the waste receiving surface 60A, and a recess 90 provided at the bottom, and a toilet bowl portion 10. In a plan view, the first connecting surface 40A in the rear region of the first connecting portion 40 has a central connecting surface 47 that extends between a pair of virtual parallel lines P1, P1 extending parallel to the left and right centerline CL1 of the toilet bowl portion 10 from both left and right ends WL, WR of the water surface WS formed in the recess 90, and left and right connecting surfaces 49 that extend outward to the left and right from both left and right ends of the central connecting surface 47. In the vertical cross-sectional shape obtained by cutting the toilet bowl portion 10 through a vertical plane passing through the center 10C in a plan view, the inclination angle of the central connecting surface 47 is steeper than the inclination angles of the left and right connecting surfaces 49.

[0039] In this toilet bowl 1, the first connecting surface 40A in the rear region of the first connecting portion 40 guides the first main flow F1, which has traveled around the inside of the toilet bowl 10 along the inner wall surface 21A of the rim, to flow downward. As a result, in this toilet bowl 1, the first main flow F1 flows into the recess 90 from the rear, allowing for efficient discharge of waste.

[0040] The first connecting surface 40A in the rear region of the first connecting section 40 has a vertical cross-sectional shape in which the length gradually increases from both the left and right sides toward the center. This toilet 1 guides the first main flow F1, which has traveled around the inside of the toilet bowl 10 along the inner wall surface 21A of the rim, toward a downward flow, allowing it to flow smoothly along the first connecting surface 40A. As a result, this toilet 1 allows the first main flow F1 to flow forcefully from the rear into the recess 90, enabling efficient discharge of waste.

[0041] In the vertical cross-sectional shape, the radius of curvature of the first connecting surface 40A in the rear region of the first connecting section 40 gradually increases from both the left and right sides toward the center. This toilet 1 guides the first main flow F1, which has traveled around the toilet bowl section 10 along the inner wall surface 21A of the rim, toward a downward flow, allowing it to flow smoothly along the first connecting surface 40A. As a result, this toilet 1 allows the first main flow F1 to flow forcefully into the recess 90 from the rear, enabling efficient discharge of waste.

[0042] The lower edge of the first connecting surface 40A in the rear region of the first connecting section 40 is lowest in the center. This toilet 1 guides the first main flow F1, which has traveled around the inside of the toilet bowl 10 along the inner wall surface 21A of the rim, into a downward flow, allowing it to flow downward along the first connecting surface 40A. As a result, this toilet 1 allows the first main flow F1 to flow forcefully into the recess 90 from the rear, enabling efficient discharge of waste.

[0043] The first connecting surface 40A in the rear region of the first connecting section 40 exhibits a large change in the inclination angle of its vertical cross-sectional shape in the region closer to the virtual parallel line P1 than to the left-right center. This toilet 1 guides the first main flow F1, which has traveled around the toilet bowl 10 along the inner rim wall surface 21A, into a downward flow, allowing it to flow smoothly along the first connecting surface 40A. As a result, this toilet 1 allows the first main flow F1 to flow forcefully into the recess 90 from the rear, enabling efficient discharge of waste.

[0044] The waste receiving surface 60A in the rear region of the bowl portion 60 has, in a plan view, a central waste receiving surface 61 that extends between a pair of virtual parallel lines P1, P1, and left and right waste receiving surfaces 63 that extend outward from both left and right edges of the central waste receiving surface 61. In the vertical cross-sectional shape, the inclination angle of the central waste receiving surface 61 is steeper than the inclination angles of the left and right waste receiving surfaces 63. This toilet 1 guides the first main flow F1, which has traveled around the toilet bowl portion 10 along the inner rim wall surface 21A, downwards through the first connecting surface 40A in the rear region of the first connecting portion 40 and the waste receiving surface 60A in the rear region of the bowl portion 60. As a result, this toilet 1 allows the first main flow F1 to flow into the recess 90 from the rear, enabling efficient waste discharge.

[0045] The waste receiving surface 60A in the rear region of the bowl portion 60 is inclined downward from both left and right edges toward the left and right center. This toilet 1 strongly guides the first main flow F1, which has traveled around the inside of the toilet bowl portion 10 along the inner wall surface 21A of the rim, toward a downward flow. As a result, this toilet 1 allows the first main flow F1 to flow into the recess 90 from the rear, enabling efficient waste discharge.

[0046] The upper edge of the first connecting surface 40A extends to approximately the same height. Therefore, this toilet bowl 1 has good design aesthetics.

[0047] This disclosure is not limited to Embodiment 1 described above in the description and drawings, but also includes, for example, the following embodiments within its technical scope. (1) The first connecting surface of the rear region of the first connecting portion does not have to have a length that gradually changes from both the left and right sides toward the left and right center in the vertical cross-sectional shape, it may be the same, or the longest part may be shifted from the left and right center in the left and right directions. (2) The first connecting surface of the rear region of the first connecting portion does not have to have a radius of curvature that gradually increases from both the left and right sides toward the left and right center in the vertical cross-sectional shape, it may be the same, or the part with the largest radius of curvature may be shifted from the left and right center toward the left and right. (3) The height of the lower edge of the first connecting surface in the rear region of the first connecting portion may be constant, or the lowest part may be shifted from the left-right center in the left-right direction. (4) The dirt receiving surface in the rear region of the bowl may have a constant angle of inclination in its vertical cross-sectional shape. (5) The waste receiving surface in the rear area of ​​the bowl does not need to change in height from the left and right edges toward the left and right center. (6) Multiple rim outlets may be formed. (7) The rim spout may be formed on the inner wall of the rim to the right of the left-right center line of the toilet bowl and in front of the front-rear center line. In this case, the flushing water discharged from this rim spout is discharged into the toilet bowl towards the rear. [Explanation of Symbols]

[0048] 1...Toilet bowl, 10...Toilet bowl section, 10C...Center (of toilet bowl section 10), 20...Rim section, 21A...Inner wall surface of the rim, 40...First connecting section (connecting section), 40A...First connecting surface (connecting surface), 47...Central connecting surface, 49...Left and right connecting surfaces, 60...Bowl section, 60A...Waste receiving surface, 61...Central waste receiving surface, 63...Left and right waste receiving surfaces, 90...Recess, CL1...Left and right center line, P1...Virtual parallel line, WS...Water surface

Claims

1. A rim portion having an inner rim wall surface, A bowl section having a surface for receiving waste, A connecting portion having a connecting surface in which the upper edge is continuous with the lower edge of the inner wall surface of the rim and the lower edge is continuous with the upper edge of the waste receiving surface, A recess provided at the bottom, It is equipped with a toilet bowl section, The connecting surface in the rear region of the connecting portion is In a plan view, a central connecting surface extends between a pair of imaginary parallel lines extending parallel to the left and right centerlines of the toilet bowl portion from both left and right ends of the water-retaining surface formed within the recess, and left and right connecting surfaces extend outward from both left and right edges of the central connecting surface, It has, In the vertical cross-sectional shape obtained by cutting through a vertical plane passing through the center of the toilet bowl portion in a plan view, the inclination angle of the central connecting surface is steeper than that of the left and right connecting surfaces, and the change is larger in the region closer to the virtual parallel line than to the left and right center lines. In the aforementioned central connecting surface, the inclination angle is steeper on the left-right center line side than in the region where the change in inclination angle is large, compared to the virtual parallel line side than in the region where the change in inclination angle is large. The angle of inclination of the connecting surface in the rear region is the angle of inclination of the straight line connecting the upper edge and the lower edge of the connecting surface.

2. The connecting surface in the rear region of the connecting portion is The toilet according to claim 1, wherein the length of the vertical cross-sectional shape gradually increases from both the left and right sides toward the center.

3. The connecting surface in the rear region of the connecting portion is The toilet according to either claim 1 or claim 2, wherein the radius of curvature gradually increases from both the left and right sides toward the center in the vertical cross-sectional shape.

4. The lower edge of the connecting surface in the rear region of the connecting portion is the lowest in the left-right center, according to any one of claims 1 to 3.

5. The toilet according to any one of claims 1 to 4, wherein the connecting surface in the rear region of the connecting portion has a large change in the inclination angle of the vertical cross-sectional shape in the region closer to the virtual parallel line than the left and right center.

6. The waste receiving surface in the rear region of the bowl portion is In a plan view, a central waste receiving surface extending between a pair of virtual parallel lines, and left and right waste receiving surfaces extending outward from both left and right edges of the central waste receiving surface, It has, The toilet according to any one of claims 1 to 5, wherein, in the vertical cross-sectional shape, the inclination angle of the central waste receiving surface is steeper than the inclination angles of the left and right waste receiving surfaces.

7. The toilet according to any one of claims 1 to 6, wherein the waste receiving surface in the rear region of the bowl portion is inclined downward from both left and right edges toward the left and right center portion.

8. The toilet according to any one of claims 1 to 7, wherein the upper edge of the connecting surface extends to approximately the same height.

9. The toilet according to any one of claims 1 to 8, wherein, in the vertical cross-sectional shape, the connecting surface of the rear region is recessed downward along the vertical direction from the lower edge of the inner wall surface of the rim to the upper edge of the waste receiving surface.

10. The rear portion of the inner wall surface of the rim forms a rim outlet. The toilet according to any one of claims 1 to 9, wherein the flushing water discharged from the rim outlet swirls around the bowl so that it passes through the front of the toilet bowl before reaching the central connecting surface, and flows into the recess from the rear via the central connecting surface.

11. A rim portion having an inner rim wall surface, A bowl section having a surface for receiving waste, A connecting portion having a connecting surface in which the upper edge is continuous with the lower edge of the inner wall surface of the rim and the lower edge is continuous with the upper edge of the waste receiving surface, A recess provided at the bottom, It is equipped with a toilet bowl section, A rim outlet is formed at the rear of the inner wall surface of the rim, which discharges water forward along the inner wall surface of the rim. The connecting surface in the rear region of the connecting portion is In a plan view, a central connecting surface extends between a pair of imaginary parallel lines extending parallel to the left and right centerlines of the toilet bowl portion from both left and right ends of the water-retaining surface formed within the recess, and left and right connecting surfaces extend outward from both left and right edges of the central connecting surface, It has, In the vertical cross-sectional shape obtained by cutting through a vertical plane passing through the center of the toilet bowl portion in a plan view, the inclination angle of the central connecting surface is steeper than the inclination angles of the left and right connecting surfaces. The connecting surface in the rear region of the connecting portion is In the aforementioned vertical cross-sectional shape, the length of the toilet gradually increases from both the left and right sides toward the center.

12. A rim portion having an inner rim wall surface, A bowl section having a surface for receiving waste, A connecting portion having a connecting surface in which the upper edge is continuous with the lower edge of the inner wall surface of the rim and the lower edge is continuous with the upper edge of the waste receiving surface, A recess provided at the bottom, It is equipped with a toilet bowl section, The connecting surface in the rear region of the connecting portion is In a plan view, a central connecting surface extends between a pair of imaginary parallel lines extending parallel to the left and right centerlines of the toilet bowl portion from both left and right ends of the water-retaining surface formed within the recess, and left and right connecting surfaces extend outward from both left and right edges of the central connecting surface, It has, In the vertical cross-sectional shape obtained by cutting through a vertical plane passing through the center of the toilet bowl portion in a plan view, the inclination angle of the central connecting surface is steeper than the inclination angles of the left and right connecting surfaces. The radius of curvature of the connecting surface changes between the upper edge and the lower edge. The connecting surface in the rear region is a toilet in which, in the vertical cross-sectional shape, the average radius of curvature between the upper edge and the lower edge of the connecting surface gradually increases from both the left and right sides toward the center.

13. A rim portion having an inner rim wall surface, A bowl section having a surface for receiving waste, A connecting portion having a connecting surface in which the upper edge is continuous with the lower edge of the inner wall surface of the rim and the lower edge is continuous with the upper edge of the waste receiving surface, A recess provided at the bottom, It is equipped with a toilet bowl section, The connecting surface in the rear region of the connecting portion is In a plan view, a central connecting surface extends between a pair of imaginary parallel lines extending parallel to the left and right centerlines of the toilet bowl portion from both left and right ends of the water-retaining surface formed within the recess, and left and right connecting surfaces extend outward from both left and right edges of the central connecting surface, It has, In the vertical cross-sectional shape obtained by cutting through a vertical plane passing through the center of the toilet bowl portion in a plan view, the inclination angle of the central connecting surface is steeper than that of the left and right connecting surfaces, and the change is larger in the region closer to the virtual parallel line than to the left and right center lines. In the aforementioned central connecting surface, the inclination angle is steeper on the left-right center line side than in the region where the change in inclination angle is large, compared to the virtual parallel line side than in the region where the change in inclination angle is large. In the aforementioned vertical cross-sectional shape, the central connecting surface is recessed downward along the vertical direction from the lower edge of the inner wall surface of the rim to the upper edge of the waste receiving surface.

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