flush toilet

Abstract

To provide a flush toilet bowl capable of improving support strength for a pot part including a water storage part with a large weight load even if a whole water storage area of the water storage part is secured to some extent.SOLUTION: A flush toilet bowl 1 according to the present invention comprises a floor-standing type ceramic toilet bowl body 2. The toilet bowl body comprises: a bowl part 6 having a dirt receiving surface 14 and a pot part 12; a drain trap part 8; an outer wall 44 forming an outline of the toilet bowl body; and an inner support wall 46 that is provided inside the outer wall and supports the pot part. The pot part comprises: a bottom wall 32; side walls 36, 38; and a joint part 40 that joins an outer edge 32b of the bottom wall and lower edges 36c, 38c of the side walls at a surface C1 having a curvature factor. The inner support wall comprises a vertical wall part 48 extending upward from a floor surface A1 within a range of 45 degrees to 90 degrees with respect to a horizontal plane in a side view of a front area of the pot part, and an upper end 48a of the vertical wall part 48 is joined directly or indirectly to the joint part of the pot part.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a flush toilet, and more particularly to a flush toilet that is flushed with flush water to expel waste. [Background technology]

[0002] Conventionally, flush toilets that are cleaned with flush water to discharge waste include those that have a floor-standing ceramic toilet body that is placed on the floor, as described in Patent Document 1, for example. This type of floor-standing ceramic toilet body includes a bowl and a drain trap with an inlet connected to the bottom of the bowl. The bowl also includes a bowl-shaped waste receiving surface and a basin below the waste receiving surface that holds a predetermined amount of water to form a water reservoir. Furthermore, because such toilet bodies are made of ceramic, they are relatively heavy. In particular, when the toilet body is placed on the floor, the basin of the bowl is subjected to the weight of the basin itself and the weight of the flush water in the reservoir, as well as the weight of the waste receiving surface and other components acting from above, and the weight of the drain trap, the inlet of which is connected below the basin, acting from below, making it a part with a heavy weight load. Therefore, the toilet body of the conventional flush toilet described in Patent Document 1 mentioned above is equipped with an outer wall that forms the outer shell of the toilet body, and an inner support wall that is provided inside the toilet body, as a structure for supporting the basin, which includes the water reservoir, which has a particularly heavy weight load. The inner support wall extends upward from the middle of the outer wall in the vertical direction towards the basin, which is above and inward of it, and then extends laterally and is joined to the basin's side wall, so that it can support from the outside the side wall of the basin, which includes the water reservoir, which has a relatively heavy weight load. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-28262 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the conventional flush toilet described in Patent Document 1 mentioned above, the larger the water collection area of the water collection section is designed to be, the greater the amount of water stored in the water collection section, and the larger the area of the ceramic basin that includes the water collection section becomes, so the weight of the entire basin including the water collection section also increases. As a result, the inner support walls of the toilet body that support the side walls of the basin from the sides are prone to damage and deformation, and in recent years, there has been a demand for ways to improve the support strength for the basin, including the water storage section, which bears a heavy weight load.

[0005] Therefore, the present invention was made to solve the problems of the prior art mentioned above and the issues that have been required in recent years, and aims to provide a flush toilet that can improve the support strength for the basin part, including the water storage part, which has a heavy weight load, even if the entire water storage area of the water storage part is ensured to be relatively large. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems, the present invention provides a flush toilet that is flushed with flush water to discharge waste, and has a floor-standing ceramic toilet body that is placed on the floor, and this toilet body has a bowl section that includes a bowl-shaped waste receiving surface and a basin section that is provided below this waste receiving surface and forms a water reservoir section with accumulated water, a drain trap section that has an inlet connected to the bottom of the basin and discharges waste within the bowl section, an outer wall that is provided on the outside of the bowl section and the drain trap section and forms the outer shell of the toilet body, and a drain that is provided inside this outer wall and has an upper end that is connected to the and an inner support wall joined to the urn portion to support the urn portion, the urn portion having a bottom wall formed above and forward of the inlet of the drain trap portion, a side wall formed to surround the periphery of the bottom wall, and a joint joining the outer edge of the bottom wall to the lower edge of the side wall with a curved surface, the inner support wall having a vertical wall portion in the front region of the urn portion extending upward from the floor surface at an angle between 45 degrees and 90 degrees with respect to the horizontal plane in a side view, the upper end of this vertical wall portion being joined directly or indirectly to the joint of the urn portion. In the present invention configured as described above, the floor-standing ceramic toilet body is relatively heavy. Furthermore, when a floor-standing ceramic toilet body is placed on the floor, the pot part of the bowl in particular is subject to a heavy weight load, as not only is the weight of the pot part itself and the weight of the flush water volume in the water storage part acting on it, but the weight of the waste receiving surface and the like acts from above, and furthermore the weight of the drain trap part, whose inlet is connected below the pot part, also acts from below. Furthermore, the weight of the water reservoir increases as the water reservoir area of the water reservoir increases, and therefore the weight of the entire pot including the water reservoir also increases accordingly. Therefore, in the present invention, the inner support wall, which is located inside the outer wall that forms the outer shell of the toilet body, is provided with a vertical wall portion in the front region of the basin that extends upward from the floor at an angle between 45 and 90 degrees to the horizontal plane, so that the upper end of this vertical wall portion can be directly or indirectly joined to a joint that joins the outer edge of the bottom wall of the basin and the lower edge of the side wall at a curved surface. This allows the vertical wall portion of the inner support wall of the toilet body to directly or indirectly support the basin portion, which has a heavy weight load, using the joint that joins the outer edge of the bottom wall to the lower edge of the side wall as a fulcrum, thereby increasing the strength of the toilet body, including the basin portion, which has a heavy weight load.

[0007] In the present invention, preferably, the inner support wall has an upper end of a vertical wall portion directly joined to the joint portion at the front end of the pot portion. In the present invention configured in this manner, among the joints joining the outer edge of the bottom wall of the pot portion to the lower edge of the side wall, the joint at the front end of the pot portion is one of the areas where stress concentration is likely to occur. Therefore, in the present invention, by directly joining the upper end of the vertical wall portion of the inner support wall, which has a large vertical component, to the joint at the front end of the pot portion, the joint at the front end of the pot portion, where stress concentration is likely to occur, can be reliably supported from below by the vertical wall portion. Therefore, the support structure in the state where the vertical wall portion of the inner support wall supports the pot portion does not need to be complicated, and the support strength can be ensured.

[0008] In the present invention, preferably, the inner support wall further includes a horizontal wall portion joined to the upper end of the vertical wall portion and extending laterally, and this horizontal wall portion has an outer end portion joined to the upper end of the vertical wall portion and an inner end portion joined to the joint portion at the lateral portion on both the left and right sides of the front end of the pot portion, and the upper end of the vertical wall portion is indirectly joined to the joint portion at the lateral portion on both the left and right sides of the front end of the pot portion via the horizontal wall portion. In the present invention configured in this manner, the upper end of the vertical wall portion of the inner support wall is indirectly joined via the horizontal wall portion to the joints on both the left and right sides of the front end of the pot portion, so that the front end of the pot portion is directly supported only by the vertical wall portion, while the vertical wall portion indirectly supports the lateral portions on both the left and right sides of the front end of the pot portion via the horizontal wall portion. Therefore, the vertical wall portion and the horizontal wall portion of the inner support wall can firmly hold the joint portion of the pot portion from the outside in front and on the left and right sides. Furthermore, when the side walls support the basin from the outside on both sides, an internal space is formed below the side walls, ensuring sufficient internal space for the toilet body. This allows the internal space of the toilet body to be used effectively as needed depending on the installation situation of the toilet body.

[0009] In the present invention, the lateral wall portion is preferably formed so that the length in the left-right direction from the outer end to the inner end increases from the front side to the rear side. In the present invention configured in this manner, the left-right length from the outer end to the inner end of the side wall portion is configured to increase as it moves from the front side to the rear side, so the internal space below the side wall portion increases as it moves from the front side to the rear side, making it possible to ensure a larger internal space in the toilet body. [Effects of the Invention]

[0010] According to the flush toilet of the present invention, even if the overall water storage area of the water storage unit is secured to be relatively large, it is possible to improve the support strength for the basin portion, which includes the water storage unit, which bears a heavy weight load. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a schematic plan view of a flush toilet according to an embodiment of the present invention. [Figure 2] FIG. 2 is a side cross-sectional view taken along line II-II in FIG. [Figure 3] FIG. 3 is an enlarged side cross-sectional view of the flush toilet according to one embodiment of the present invention shown in FIG. 2, showing an enlarged front portion of the basin portion of the toilet body. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 2. [Figure 5] FIG. 3 is a cross-sectional view taken along line VV in FIG. [Figure 6] FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. [Figure 7] FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0012] A flush toilet according to one embodiment of the present invention will be described below with reference to Figs. First, Figure 1 is a schematic plan view of a flush toilet according to one embodiment of the present invention, and Figure 2 is a side cross-sectional view taken along line II-II in Figure 1. As shown in Figures 1 and 2, a flush toilet 1 according to one embodiment of the present invention comprises a floor-standing ceramic toilet body 2 that is placed on a floor surface A1. The toilet body 2 is provided with a water channel 4, a bowl-shaped bowl portion 6, and a drain trap portion 8 from the upstream side to the downstream side. As a result, the flush toilet 1 according to one embodiment of the present invention is a so-called "siphon-type flush toilet," which uses the siphon action to suck up waste inside the bowl section 6 and discharge it all at once to the outside through the drain trap section 8. Furthermore, the flush toilet 1 according to one embodiment of the present invention is not limited to siphon-type flush toilets, but can also be applied to so-called "wash-down flush toilets," in which waste is washed away by the flowing water caused by the difference in water height within the bowl.

[0013] Furthermore, in the flush toilet 1 of this embodiment shown in Figures 1 and 2, a toilet seat (not shown) and toilet lid (not shown) are provided on the upper surface of the toilet body 2, but as this is similar to the structure of a conventional flush toilet, a detailed explanation will be omitted. Furthermore, functional parts (not shown) such as a sanitary washing section (not shown) that washes the user's private parts and a water supply system functional section that is involved in the water supply function to the toilet body 2 may be provided on the rear side of the toilet seat (not shown) and toilet lid (not shown) on the top surface of the toilet body 2, but as these are similar to the structure of conventional flush toilets, detailed explanations will be omitted.

[0014] Next, as shown in Figure 1, a flush toilet 1 according to one embodiment of the present invention is equipped with a gravity-fed water storage tank 10, which is a flush water source that stores flush water used for flushing the toilet and supplies it to the toilet body 2. Here, in this embodiment, the flush water source that supplies flush water to the toilet body 2 is not limited to a tank type such as the gravity-fed water storage tank 10 described above, and other types are also applicable. In other words, the flush water source that supplies flush water to the toilet body 2 may be a direct water pressure type that directly uses the water supply pressure of tap water, or a flush valve type, or it may be a type that supplies flush water using supplementary pressure from a pump.

[0015] Next, in the flush toilet 1 according to one embodiment of the present invention shown in Figure 1, when viewed from above the bowl portion 6 of the toilet body 2, the central axis extending horizontally left and right so as to divide the bowl portion 6 equally in the front-to-rear direction relative to the basin portion 12 located in the center of the left and right directions is indicated by the symbol "X". In addition, in a plan view of the bowl portion 6 of the toilet body 2 shown in FIG. 1, the central axis extending horizontally in the front-rear direction so as to divide the bowl portion 6 into two equal parts in the left-right direction is indicated by the symbol "Y". Furthermore, in a plan view of the bowl portion 6 of the toilet body 2 shown in Figure 1, the intersection of the central axes X and Y is the center O of the bowl portion 6 in the plan view, and the central axis extending vertically through this center O is indicated by the symbol "Z" in Figures 1 and 2. Furthermore, as shown in FIG. 1, the front, back, left and right directions of the flush toilet 1 are indicated by "front," "rear," "left," and "right," respectively.

[0016] Furthermore, as shown in Figures 1 and 2, in the flush toilet 1 of this embodiment, the area inside the bowl portion 6 that is forward of the central axis X is defined as the "front region F of the bowl portion 6." Furthermore, within this front region F of the bowl portion 6, the left region L and right region R relative to the central axis Y in the horizontal front-to-rear direction of the bowl portion 6 are defined as the "left front region LF of the bowl portion 6" and the "right front region RF of the bowl portion 6," respectively. Similarly, the area within the bowl portion 6 that is rearward of the central axis X is defined as the "rear region B of the bowl portion 6." Furthermore, in this rear region B of the bowl portion 6, the left region L and right region R with respect to the central axis Y of the bowl portion 6 in the horizontal front-to-rear direction are defined as the "left rear region LB of the bowl portion 6" and the "right rear region RB of the bowl portion 6," respectively.

[0017] Next, as shown in Figure 1, the water conduit 4 located on the upstream side of the toilet body 2 is formed on the rear side of the bowl portion 6 and is designed to guide flush water supplied from the water storage tank 10 into the bowl portion 6. As shown in Figures 1 and 2, the bowl portion 6, located downstream of the water channel 4 of the toilet body 2, is equipped with, from bottom to top, a basin portion 12, a waste receiving surface 14, a shelf portion 16, and a rim portion 18, the details of which will be described later. Furthermore, a first rim spout 20 is provided on the front side of the rim portion 18 in the left rear region LB of the bowl portion 6, and a second rim spout 22 is provided on the rear side of the rim portion 18 in the right rear region RB of the bowl portion 6.

[0018] Next, as shown in FIGS. 1 and 2, the water conduit 4 includes a common water conduit 24, a first rim water conduit 26, and a second rim water conduit . First, the common water channel 24 is formed inside the toilet body 2 on the rear side of the bowl portion 6 so as to extend from the rear inlet 4a connected to the water storage tank 10 to near the rear side of the front bowl portion 6. In addition, the first rim water conduit 26 is formed inside the rim portion 18 in the left rear region LB of the bowl portion 6 so as to branch off from the common water conduit 24 to the left side of the bowl portion 6 near the rear side of the bowl portion 6, and then extend around the outer peripheral surface of the bowl portion 6 to the first rim water outlet 20 on the front side. As a result, the flush water supplied from the common water conduit 24 to the first rim water conduit 26 is discharged forward from the first rim water outlet 20 towards the shelf portion 16 in front of it as the first rim discharge, and then forms a swirling flow that swirls from the left front area LF within the bowl portion 6 through the right front area RF to the right rear area RB.

[0019] Furthermore, the second rim water conduit 28 branches off from the common water conduit 24 to the right side of the bowl portion 6 near the rear side of the bowl portion 6, then bends (makes a U-turn) toward the second rim water outlet 22 on the left side near the right side of the toilet body 2, and is formed inside the rear side of the rim portion 18 in the right rear region RB of the bowl portion 6 so as to extend to the second rim water outlet 22. As a result, the flush water supplied from the common water conduit 24 to the second rim water conduit 28 is discharged rearward as the second rim discharge from the second rim water outlet 22 towards the shelf section 16 behind it, then circulates from the right rear area RB within the bowl section 6 through the left rear area LB to the left front area LF, and then flows from this left front area LF into the front area within the basin section 12. In addition, a portion of the second rim water discharged from the second rim water discharge port 22 flows from the waste receiving surface 14 in the rear area of the basin portion 12 of the bowl portion 6 into the rear area within the basin portion 12. In this embodiment, a form is described in which the shelf portion 16 of the bowl portion 6 is provided between the outer edge of the waste receiving surface 14 and the lower end of the rim portion 18, but the shelf portion 16 does not necessarily have to be provided, and the shelf portion 16 may be omitted, and the first rim water outlet and the second rim water outlet, respectively, from the first rim water outlet 20 and the second rim water outlet 22 may be directly discharged onto the upper edge of the waste receiving surface 14 without passing through the shelf portion 16.

[0020] Next, the pot portion 12 of the bowl portion 6 and its surrounding area will be described in detail with reference to FIGS. First, FIG. 3 is an enlarged side cross-sectional view of the flush toilet according to one embodiment of the present invention shown in FIG. 2, showing an enlarged front portion of the basin portion of the toilet body. 4 to 7 are cross-sectional views taken along lines IV-IV in FIG. 2, VV in FIG. 2, VI-VI in FIG. 2, and VII-VII in FIG. 2, respectively.

[0021] First, as shown in FIG. 2, the basin portion 12 of the bowl portion 6 is provided below the waste receiving surface 14, and forms a water reservoir portion W0 with accumulated water. Here, in Figures 2 and 4 to 7, the water level of the water surface in the water storage section W0 of the basin section 12 of the bowl section 6 in the standby state (sealed state) before toilet flushing is performed, i.e., the water level of the sealed water surface (sealed water level), is indicated by the symbol "WL". Next, as shown in FIGS. 2 to 7, the basin portion 12 has a bottom wall 32 that is provided above and in front of the inlet 30 of the drain trap portion 8 and forms the bottom surface 32a of the basin portion 12. The pot portion 12 also has rear walls 34 (left rear wall 34a, right rear wall 34b) provided on the rear side of the inlet 30 of the drain trap portion 8. Furthermore, the pot portion 12 has side walls 36 (rear side wall 36, rear left side wall 36a, rear right side wall 36b) that extend outward to the left and right from both left and right ends of the rear wall 34 (the left end of the left rear wall 34a and the right end of the right rear wall 34b) toward the front. In addition, the pot portion 12 is configured so as to narrow inwardly to the left and right from the left and right front ends of the rear side wall 36 (the front ends of the rear left side wall 36a and the rear right side wall 36b) toward the front, and is provided with side walls 38 (front side wall 38, front left side wall 38a, front right side wall 38b) whose front ends are joined together.

[0022] Next, as shown in FIG. 3, the pot portion 12 further includes a lower joint portion 40 that joins the outer edge 32b of the bottom surface 32a of the bottom wall 32 and the lower edges 36c, 38c of the side walls 36, 38 with a curved surface (curved surface C1). In addition, in the side cross-sectional view of Figure 3, the curvature of the curved surface C1 in the section between the lower edge 40a and the upper edge 40b of the lower joint 40 is set to be greater than the curvature of the tangent plane C2 including the bottom surface 32a at the lower joint point P1 that joins the lower edge 40a of the lower joint 40 (the lower edge 40a of the curved surface C1) and the outer edge 32b of the bottom surface 32a of the bottom wall 32. Similarly, in the side cross-sectional view of Figure 3, the curvature of the curved surface C1 of the lower joint 40 is set to be greater than the curvature of the tangent plane C3 including the wall surfaces of the side walls 36, 38 at the upper joint point P2 that joins the upper edge 40b of the lower joint 40 (upper edge 40b of the curved surface C1) and the lower edges 36c, 38c of the side walls 36, 38.

[0023] Next, as shown in FIG. 3, the pot portion 12 further includes an upper joint portion 42 that joins the upper edges 36d, 38d of the side walls 36, 38 and the lower edge 14a of the waste receiving surface 14 with a curved surface (curved surface C4). In addition, in the side cross-sectional view of Figure 3, the curvature of the curved surface C4 in the section between the lower edge 42a and the upper edge 42b of the upper joint 42 is set to be larger than the curvature of the tangential plane C5 including the wall surfaces of the side walls 36, 38 at the lower joint point P3 that joins the lower edge 42a of the upper joint 42 (the lower edge 42a of the curved surface C4) and the upper edges 36d, 38d of the side walls 36, 38. Similarly, in the side cross-sectional view of Figure 3, the curvature of the curved surface C4 of the upper joint 42 is set to be greater than the curvature of the tangential plane C6 including the wall surface of the waste receiving surface 14 at the upper joint point P4 which joins the upper edge 42b of the upper joint 42 (upper edge 42b of the curved surface C4) and the lower edge 14a of the waste receiving surface 14.

[0024] Next, as shown in Figures 2 to 7, the toilet body 2 of the flush toilet 1 of this embodiment further comprises an outer wall 44 provided on the outside of the bowl portion 6 and the drain trap portion 8. This outer wall 44 comprises an outer wall 44 that forms the outer contour of the toilet body 2 (the so-called skirt portion or hem portion of the toilet body 2). The toilet body 2 further includes an inner support wall 46 located inside the outer wall 44. The upper end of this inner support wall 46 is joined to the basin portion 12, supporting the basin portion 12 from below.

[0025] Next, as shown in FIGS. 2 to 7, the inner support wall 46 includes a vertical wall portion 48 and a horizontal wall portion 50. As shown in FIG. First, the vertical wall portion 48 of the inner support wall 46 is formed so as to extend upward from the floor surface A1 at an inclination angle α with respect to the horizontal plane (floor surface A1) in the side cross-sectional view of FIG. The upper end of the vertical wall portion 48 of the inner support wall 46 is directly joined to the outer surface of the lower joint portion 40 in the front region of the jar portion 12 (see FIG. 3). Here, the inclination angle α of the vertical wall portion 48 is preferably set in the range of 45 degrees to 90 degrees, and more preferably set in the range of 45 degrees to 88 degrees.

[0026] Next, as shown in FIGS. 4 to 7, the horizontal wall portion 50 of the inner support wall 46 is joined to the upper end 48a of the vertical wall portion 48 and is formed to extend in the horizontal direction. The horizontal wall portion 50 has an outer end portion 50a and an inner end portion 50b. The outer end portion 50a of the horizontal wall portion 50 is joined to the upper end 48a of the vertical wall portion 48. Furthermore, the inner end portions 50b of the side wall portions 50 are joined to the lower joining portions 40 on both the left and right sides of the front end T of the pot portion 12. As a result, as shown in FIGS. 4 to 7, the upper ends 48a of the vertical wall portions 48 are indirectly joined via the horizontal wall portions 50 to the lower joint portions 40 on both the left and right sides of the front end T of the pot portion 12. As shown in FIGS. 4 to 7, the lateral wall portion 50 is formed so that the length L1 in the left-right direction from the outer end portion 50a to the inner end portion 50b increases from the front side to the rear side.

[0027] In the flush toilet 1 according to the embodiment of the present invention described above, the floor-standing ceramic toilet body 2 is relatively heavy. Furthermore, when the floor-standing ceramic toilet body 2 is placed on the floor surface A1, the pot portion 12 of the bowl portion 6 is particularly subjected to a heavy weight load, as it is subjected to the weight of the pot portion 12 itself and the weight of the amount of flushing water in the water storage portion W0, as well as the weight of the waste receiving surface 14 and the like acting from above, and furthermore the weight of the drain trap portion 8, the inlet 30 of which is connected below the pot portion 12, acting from below. Furthermore, the weight of the water reservoir W0 increases as the water reservoir area of the water reservoir W0 increases, and therefore the weight of the entire basin 12 including the water reservoir W0 also increases accordingly. Therefore, in the flush toilet 1 of this embodiment, the inner support wall 46, which is located inside the outer wall 44 that forms the outer contour of the toilet body 2, has a vertical wall portion 48 in the front region of the basin portion 12 that extends upward from the floor surface A1 at an angle between 45 and 90 degrees with respect to the horizontal plane (floor surface A1). This allows the upper end 48a of this vertical wall portion 48 to be joined directly or indirectly to the lower joint portion 40, which joins the outer edge 32b of the bottom wall 32 of the pot portion 12 and the lower edges 36c, 38c of the side walls 36, 38 at a curved surface C1. Therefore, the vertical wall portion 48 of the inner support wall 46 of the toilet body 2 can directly or indirectly support the basin portion 12, which has a heavy weight load, using the lower joint portion 40, which joins the outer edge 32b of the bottom wall 32 and the lower edges 36c, 38c of the side walls 36, 38, as a fulcrum, thereby increasing the strength of the toilet body 2, including the basin portion 12, which has a heavy weight load.

[0028] Furthermore, according to the flush toilet 1 of this embodiment, of the lower joint 40 that joins the outer edge 32b of the bottom wall 32 of the basin portion 12 to the lower edges 36c, 38c of the side walls 36, 38, the lower joint 40 at the front end T of the basin portion 12 (see Figure 3) is one of the areas where stress concentration is likely to occur. Therefore, in the flush toilet 1 of this embodiment, the upper end 48a of the vertical wall portion 48 of the inner support wall 46, which has a large vertical component, is directly joined to the lower joint 40 at the front end T of the basin portion 12, so that the lower joint 40 at the front end T of the basin portion 12, where stress concentration is likely to occur, can be reliably supported from below by the vertical wall portion 48. Therefore, the support structure in the state where the vertical wall portion 48 of the inner support wall 46 supports the pot portion 12 can be made complex, and the support strength can be ensured.

[0029] Furthermore, with the flush toilet 1 of this embodiment, as shown in Figures 4 to 7, the upper ends 48a of the vertical wall portions 48 of the inner support wall 46 are indirectly joined via horizontal wall portions 50 to the lower joint portions 40 on both the left and right sides of the front end T of the basin portion 12. As a result, the front end T of the pot portion 12 is directly supported only by the vertical wall portion 48 (see Figure 3), while the vertical wall portion 48 can indirectly support the lateral portions of the pot portion 12 on both the left and right sides of the front end T via the horizontal wall portion 50 (see Figures 4 to 7). Therefore, the vertical wall portion 48 and the horizontal wall portion 50 of the inner support wall 46 can firmly hold the pot portion 12 against the lower joint portion 40 from the front and from the outside on the left and right sides. Furthermore, when the side walls 50 support the lower joint 40 of the basin 12 from the outside on both the left and right sides, an internal space is formed below the side walls 50, ensuring internal space within the toilet body 2. This allows the internal space of the toilet body 2 to be used effectively as appropriate depending on the installation situation of the toilet body 2.

[0030] Furthermore, with the flush toilet 1 according to this embodiment, as shown in Figures 4 to 7, the length L1 in the left-right direction from the outer end 50a to the inner end 50b of the side wall portion 50 is formed so that it increases from the front side to the rear side. As a result, the internal space below the lateral wall portion 50 becomes larger from the front side to the rear side, and a larger internal space can be secured in the toilet body 2. [Explanation of symbols]

[0031] 1 flush toilet 2 Toilet body 4 Waterway 4a Entrance to the waterway 6 Bowl section 8 Drain trap section 10. Water Tank 12 Pot section 14 Waste receiving surface 14a Lower edge of waste receiving surface 16 Shelf 18 Rim 20 First rim outlet 22 Second rim outlet 24 Common waterway 26 First Rim Waterway 28 Second Rim Waterway 30 Drain trap inlet 30a Rear end of the drain trap inlet 30b Front end of the drain trap inlet 32 Bottom wall of the pot 32a Bottom surface of the bottom wall of the pot 32b Outer edge of the bottom wall of the pot 34 Rear wall of the pot 34a Left rear wall of the pot 34b Right rear wall of the pot 36 Rear side wall of the pot (side wall of the pot) 36a Left rear wall of the pot (side wall of the pot) 36b Rear right wall of the pot (side wall of the pot) 36c Lower edge of rear side wall of pot part (lower edge of side wall of pot part) 36d Upper edge of rear side wall of pot 38 Front side wall of the pot (side wall of the pot) 38a Front left wall of the pot (side wall of the pot) 38b Front right wall of the pot (side wall of the pot) 38c Lower edge of the front side wall of the pot (lower edge of the side wall of the pot) 38d Upper edge of rear side wall of pot 40 Lower joint (joint of pot part) 40a Lower edge of lower joint 40b Upper edge of lower joint 42 Upper joint 42a Lower edge of upper joint 42b Upper edge of upper joint 44 Outer wall 44a Bottom of recess 44b Rear end of recess 46 Inner support wall 48 Vertical wall section of inner support wall 48a Upper end of vertical wall 50 Side wall of inner support wall A1 Floor B. Rear area of bowl C1 Curved surface of the lower joint (surface with curvature of the joint) C2 tangent plane C3 tangent plane C4 Upper joint curved surface (surface with joint curvature) C5 tangent plane C6 Tangent plane d1 Vertical depression of the pot F Front area of bowl f1 Flow of cleaning water f2 Flow of cleaning water (vertical swirling flow) f3 Flow of cleaning water f4 Flow of cleaning water H1 Vertical width of upper joint in side view L Left side of bowl LB Left rear area of the bowl LF: Left front area of the bowl L1: The length from the outer edge of the side wall to the inner edge in the left-right direction O Center of the bowl, center of the pot in the front-to-back direction P1 Lower joint point joining the lower edge of the lower joint to the outer edge of the bottom surface of the base wall P2 Upper joint point joining the upper edge of the lower joint and the lower edge of the side wall P3 Lower joint point joining the lower edge of the upper joint to the upper edge of the side wall P4 Upper joint point where the upper edge of the upper joint joins with the lower edge of the waste receiving surface P5: The apex position of the convex part at the transition part of the bottom wall of the pot P6: The lowest bottom position of the recess in the bottom wall of the pot R Right side area of bowl RB bowl right rear area RF bowl right front area T Front end of pot W0 Reservoir WL Seal water level X: Horizontal center axis of bowl Y Horizontal center axis of bowl section in the front-to-rear direction Z Vertical central axis passing through the center of the bowl α Incline angle

Claims

[Claim 1] A flush toilet that is flushed with flush water to discharge waste, It has a floor-standing ceramic toilet body that is placed on the floor, The toilet body includes a bowl portion having a bowl-shaped waste receiving surface and a basin portion provided below the waste receiving surface to form a water reservoir portion by storing water; a drain trap section having an inlet connected to a lower portion of the pot section for discharging waste from within the bowl section; an outer wall provided outside the bowl portion and the drain trap portion and forming an outer shell of the toilet body; an inner support wall that is provided inside the outer wall and has an upper end joined to the pot portion to support the pot portion, The pot portion has a bottom wall formed above and in front of the inlet of the drain trap portion, a side wall formed to surround the periphery of the bottom wall, and a joint portion that joins the outer edge of the bottom wall and the lower edge of the side wall with a curved surface, The inner support wall has a vertical wall portion in a front region of the pot portion that extends upward from the floor surface at an angle of 45 degrees to 90 degrees with respect to a horizontal plane in a side view, and an upper end of the vertical wall portion is directly or indirectly joined to the joint portion of the pot portion, The inner support wall has an upper end of a vertical wall portion directly joined to the joint portion at the front end of the pot portion, The inner support wall further includes a horizontal wall portion joined to the upper end of the vertical wall portion and extending laterally, and this horizontal wall portion includes an outer end portion joined to the upper end of the vertical wall portion and an inner end portion joined to the joint portion at the side portion on both the left and right sides of the front end of the pot portion, and the upper end of the vertical wall portion is indirectly joined to the joint portion at the side portion on both the left and right sides of the front end of the pot portion via the horizontal wall portion, A flush toilet characterized in that the horizontal wall portion is formed so that the length in the left-right direction from the outer end to the inner end increases from the front side to the rear side.

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