Water-washable toilet

Abstract

To provide a flush toilet bowl that can improve design of a toilet bowl body while maintaining washability and cleanability of the toilet bowl body with a simpler configuration.SOLUTION: A flush toilet bowl that washes a toilet bowl body with washing water comprises: a bowl part that has a bowl-shaped filth receiving surface and a rim part that is formed along an upper edge of the filth receiving surface so that an inner peripheral surface thereof rises in a vertical direction; a water discharge port that forms a swirling flow by discharging the washing water into the bowl part; and a conduit that supplies the washing water to the water discharge port, wherein a throttle flow channel is formed at a downstream end part of the conduit, the water discharge port is a horizontally long opening, and a latter half part of the bowl part is formed in front of a position where an angle between a straight line along a front-back direction of the bowl part and a perpendicular line to a tangent at the center of a width of the water discharge port on a curve representing the inner peripheral surface of the rim part is 45 degrees in a top view.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a flush toilet that cleans a toilet body with washing water.

Background Art

[0002] Conventionally, there has been known a flush toilet including a bowl portion having a bowl-shaped dirt receiving surface and a rim portion formed along the upper edge of the dirt receiving surface, and first and second water discharge ports that discharge washing water into the bowl portion to form a swirling flow (see, for example, Patent Document 1). In the flush toilet described in Patent Document 1, the inner peripheral surface of the rim portion is formed by a flat surface extending in a substantially vertical direction. That is, the inner peripheral surface of the rim portion does not have an overhanging shape. Therefore, the cleaning performance of the bowl portion is improved as compared with a flush toilet in which the rim portion overhangs.

[0003] Further, in the flush toilet described in Patent Document 1, the first water discharge port is located closer to the rear on one side across a line extending in the front-rear direction passing through the center of the bowl portion, and the second water discharge port is located on the downstream side of a region where the radius of curvature increases in a region where the radius of curvature of the rim portion is small closer to the front on the other side across a line extending in the front-rear direction of the bowl portion, which is a region where the washing water discharged from the first water discharge port is most likely to scatter. Therefore, the washing water discharged from the first water discharge port is guided by the washing water discharged from the second water discharge port. Thereby, it is possible to suppress the washing water discharged from the first water discharge port from scattering beyond the rim portion. Furthermore, since the first water discharge port located at the rear of the bowl portion has a horizontally flattened opening, it is possible to minimize the upward flow component of the washing water discharged from the first water discharge port. Thereby, even when the inner peripheral surface of the rim portion is formed by a flat surface extending in a substantially vertical direction, that is, when the inner peripheral surface of the rim portion does not overhang, it is possible to more effectively suppress the washing water discharged from the first water discharge port from scattering beyond the rim portion.

Prior Art Documents

Patent Documents

[0004] [Patent Document 1] Japanese Patent Publication No. 2012-207503 [Overview of the Initiative] [Problems that the invention aims to solve]

[0005] However, in the conventional flush toilet described above, the first spout is formed at the rear of the bowl, meaning that the first spout faces the user standing in front of the toilet. In other words, the first spout is formed at the rear of the bowl, a position easily visible to the user standing in front of the toilet. This raises concerns that the aesthetic appeal of the flush toilet may be diminished.

[0006] The present invention was made to solve the above-mentioned problems, and aims to provide a flush toilet that can improve the design of the toilet bowl while maintaining the washability and cleanability of the toilet bowl itself. [Means for solving the problem]

[0007] To achieve the above objective, according to one aspect of the present invention, a flush toilet that cleans the toilet bowl body with flushing water comprises a bowl portion having a bowl-shaped waste receiving surface and a rim portion formed along the upper edge of the waste receiving surface and having an inner circumferential surface that rises vertically, a water outlet that discharges flushing water into the bowl portion to form a swirling flow, and a water channel that supplies flushing water to the water outlet, wherein a constricted flow channel is formed at the downstream end of the water channel, the water outlet is a horizontally elongated opening, and is formed in the rear half of the bowl portion, in a top view, forward of a position where the angle between a straight line along the front-rear direction of the bowl portion and a perpendicular line to the tangent line at the center of the width of the water outlet on the curve representing the inner circumferential surface of the rim portion is 45 degrees.

[0008] In this configuration, in the rear half of the bowl, the spout is positioned forward of the point where, in a top view, the angle between the left-right center line of the bowl and the perpendicular line to the tangent line at the center of the width of the spout on the curve representing the inner circumference of the rim is 45 degrees. This reduces the visible width dimension for the user, making it more difficult for the user to see the spout. As a result, the aesthetic design of the toilet bowl can be improved. Furthermore, since a constricted channel is formed at the downstream end of the water conduit, the force of the water discharged from the outlet can be improved while regulating the flow of the discharged water. In addition, since the outlet has a horizontally elongated opening, the upward flow component of the cleaning water discharged from the outlet can be suppressed. Therefore, even in the highly cleanable rim section, where the inner circumferential surface is formed to rise vertically, the swirling flow formed in the bowl section can be improved. In this way, it is possible to improve the aesthetic design of the toilet bowl while maintaining its cleanability and ease of cleaning.

[0009] Furthermore, in a flush toilet according to one aspect of the present invention, preferably, the vertical size of the water outlet is smaller on the front side than on the rear side.

[0010] In this configuration, the front side of the spout is smaller in the vertical direction than the rear side. Therefore, the flow path cross-section of the front spout, which is further away from the water conduit (further downstream), is narrower than that of the rear spout. As a result, the water discharged from the spout flows vigorously in the tangential direction of the inner edge of the rim. This prevents the cleaning water from splashing over the rim while effectively generating a swirling flow within the bowl.

[0011] Furthermore, in a flush toilet according to one aspect of the present invention, preferably, a flow straightening plate is provided at the downstream end of the water conduit, with a plate surface extending in the direction of flow oriented vertically.

[0012] With this configuration, a flow straightening plate with a plate surface extending in the direction of flow oriented vertically is provided at the downstream end of the water conduit, thereby regulating the flow of water discharged from the outlet. This stabilizes the flow of water discharged from the outlet. As a result, it is possible to generate a good swirling flow within the bowl while suppressing splashing of cleaning water beyond the rim.

[0013] Furthermore, in a flush toilet according to one aspect of the present invention, preferably, a distributor is provided that discharges flushing water from a flushing water source into a water conduit.

[0014] This configuration includes a distributor that guides flushing water from the flushing water source to the water conduit and then discharges it, which allows for a simpler shape of the flush toilet from the flushing water source to the discharge outlet. As a result, the molds for manufacturing flush toilets can be simplified, improving the productivity of flush toilet production. Furthermore, the inclusion of a distributor allows for more stable flow of the cleaning water discharged from the spout. This effectively suppresses splashing of the cleaning water beyond the rim while creating a well-balanced swirling flow within the bowl. [Effects of the Invention]

[0015] According to the present invention, in a flush toilet, it is possible to improve the design of the toilet bowl while maintaining the cleanability and ease of cleaning of the toilet bowl itself. [Brief explanation of the drawing]

[0016] [Figure 1] This is a top view of a flush toilet according to the first embodiment of the present invention. [Figure 2] This is a cross-sectional view along line II-II in Figure 1. [Figure 3] This is a cross-sectional view along line III-III in Figure 2. [Figure 4] This is an explanatory diagram of the position of the water outlet according to the first embodiment of the present invention. [Figure 5] Explanatory drawing of the water outlet according to the first embodiment of the present invention. [Figure 6] (a) View of the opening of the water outlet according to the first embodiment of the present invention as seen from the front. (b) View of the opening of the water outlet according to the first embodiment of the present invention as seen from the direction facing the opening of the water outlet. [Figure 7] Schematic diagram showing the water flow of the flush toilet according to the first embodiment of the present invention. [Figure 8] Plan sectional view of the flush toilet according to the second embodiment of the present invention. [Figure 9] Front sectional view of the flush toilet according to the third embodiment of the present invention.

Embodiments for Carrying Out the Invention

[0017] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In each drawing, the same components are denoted by the same reference numerals, and detailed descriptions thereof will be omitted as appropriate.

[0018] (First Embodiment) <Configuration of the flush toilet> First, referring to FIGS. 1 to 3, the flush toilet according to the first embodiment of the present invention will be described. In the following, the description will be made using the directions shown in the drawings.

[0019] FIG. 1 is a top view of the flush toilet according to an embodiment of the present invention. FIG. 2 is a sectional view taken along line II-II of FIG. 1. FIG. 3 is a sectional view taken along line III-III of FIG. 2.

[0020] As shown in FIGS. 1 and 2, the flush toilet 1 includes a toilet body 2 made of pottery or the like, and a tank device 4 which is a cleaning water source. The tank device 4 is placed above the rear side of the toilet body 2 and is connected to a water supply source (not shown) such as a water supply pipe. When an operation lever or a remote control (not shown) of the tank device 4 is operated, cleaning water is supplied from the discharge port (not shown) of the tank device to the supply port 6 opened on the upper surface of the central rear side of the toilet body 2. In this embodiment, the tank device 4 functions as a water supply device.

[0021] A bowl section 8 into which waste is discharged is formed on the front side of the toilet bowl body 2, and a water reservoir section 10 is formed below this bowl section 8. A predetermined amount of water is formed in the water reservoir section 10. The water level W0 shown in Figure 2 is the initial water level of the reservoir. The inlet 12a of a drain trap pipe 12 for discharging waste to the outside of the flush toilet 1 is connected to the lower end of this water reservoir section 10. The drain trap pipe 12 extends to the rear from its inlet 12a, and its outlet 12b is connected to a discharge pipe (not shown) installed on the floor.

[0022] The bowl portion 8 has a generally egg-shaped form when viewed from above. The bowl portion 8 has a generally symmetrical outer shape in the left-right direction. The bowl portion 8 also has a bowl-shaped waste receiving surface 14 and a rim portion 16 formed along the upper edge of the waste receiving surface 14.

[0023] The waste receiving surface 14 is formed in a mortar shape, gradually widening from its lower edge towards its upper edge. In other words, the waste receiving surface 14 is formed so that it gradually expands from its lower edge towards its upper edge in a vertical cross-section.

[0024] The rim portion 16 is formed in an annular shape along the upper edge of the waste receiving surface 14, and its inner circumferential surface is formed to rise vertically. In other words, the inner circumferential surface of the rim portion 16 is formed by a flat surface that extends substantially vertically from the upper edge of the waste receiving surface 14, without overhanging toward the inside of the bowl portion 8. Therefore, compared to the case where the inner circumferential surface of the rim portion overhangs, the blind spot area where dirt can adhere can be reduced, and the ease of cleaning the inner circumferential surface of the rim portion 16 can be improved.

[0025] Furthermore, a toilet seat (not shown) is placed above the rim portion 16. This toilet seat is provided in an annular shape along the rim portion 16. Also, in a top view, the inner edge of the toilet seat protrudes inward into the bowl portion 8 from the inner surface of the rim portion 16 over almost its entire circumference. Furthermore, the entire inner perimeter of the toilet seat does not need to protrude further inward from the inner surface of the rim portion 16 into the bowl portion 8; it is sufficient that the inner perimeter of the toilet seat near the top of the spout 18 (described later) protrudes inward from the inner surface of the rim portion 16 into the bowl portion 8 in a canopy-like manner. Additionally, a toilet seat cover (not shown) may be provided above the toilet seat.

[0026] As shown in Figure 3, in a top view, a spout 18 is provided on the inner circumferential surface of the rim portion 16 in the rear half of the bowl portion 8, which is the part behind the center of the bowl portion 8. This spout 18 is a horizontally elongated opening, that is, a flat opening that is long in the horizontal direction. Furthermore, the spout 18 is the only spout formed on the inner circumferential surface of the rim portion 16. In other words, the spout 18 is the only hole that dispenses cleaning water into the bowl portion 8 and forms a swirling flow on the waste receiving surface 14. The location of the spout 18 will be described in detail later.

[0027] A water conduit 20 is formed at the upper rear of the toilet bowl body 2 to supply flushing water to the outlet 18. The water conduit 20 is a flow path that extends forward from the supply port 6 and connects the supply port 6 and the outlet 18. The bottom surface of the water conduit 20 slopes downward from the supply port 6 toward the outlet 18 (forward side). Furthermore, to prevent water from remaining in the water conduit 20, the bottom surface of the water conduit 20 slopes downward from the far end of the dead-end-like flow path formed by the outer edge of the bottom surface of the water conduit 20 and the partition wall toward the outlet 18, and the bottom surface of the flow path at the downstream end of the water conduit 20 is formed at the lowest height position of the bottom surface of the water conduit 20. The flushing water that flows from the tank device 4 into the supply port 6 flows through this water conduit 20 to the outlet 18.

[0028] Furthermore, a constricted channel 22 is formed at the downstream end of the water conduit 20, where the cross-sectional area of ​​the channel narrows from upstream to downstream. In this embodiment, the constricted channel 22 is a channel with a narrowed horizontal channel width and is formed downstream of the flow straightening plate 24, which will be described later. Furthermore, the throttling channel 22 may be formed to restrict the channel width not only in the horizontal direction, but also in the vertical direction or other directions. It may also be formed to restrict the channel width not only in a single direction, but in multiple directions.

[0029] Furthermore, a flow straightening plate 24 is provided at the downstream end of the water conduit 20, with a plate surface extending in the direction of flow and oriented vertically. This flow straightening plate 24 is a plate-like portion that extends from the rear end of the water outlet 18 into the water conduit 20. As shown in Figure 3, in a plan cross-sectional view, the downstream side of the flow straightening plate 24 connects to the rear edge of the water outlet 18, and together with the peripheral wall surface that forms the rear edge of the water outlet 18, it forms an acute-angled corner. The flushing water flowing through the water conduit 20 is guided to the water outlet 18 by the flow straightening plate 24. In addition, the upper and lower ends of the flow straightening plate 24 are formed continuously with the upper and bottom surfaces that form the flow path of the water conduit 20. In other words, the flow straightening plate 24 is provided as part of the toilet bowl body 2.

[0030] <About the spout> Next, with reference to Figures 4 to 6, the water outlet according to the first embodiment of the present invention will be described in detail.

[0031] Figure 4 is an explanatory diagram of the position of the spout according to the first embodiment of the present invention. Figure 5 is an explanatory diagram of the spout according to the first embodiment of the present invention. Figure 6(a) is a front view of the spout opening according to the first embodiment of the present invention, viewed from the front. Figure 6(b) is a front view of the spout opening according to the first embodiment of the present invention, viewed from a direction opposite to the spout opening.

[0032] Figures 4 and 5 are cross-sectional views taken along the line III-III in Figure 2. Furthermore, in Figure 4, which shows a top view of the flush toilet 1, the central position of the bowl portion 8 is C1, the central position of the width of the spout 18 is C2, the straight line (left-right center line) passing through the central position C1 of the bowl portion 8 and along the front-back direction is L, the tangent line at the central position C2 of the width of the spout 18 on the curve representing the inner circumferential surface of the rim portion 16 is P, the perpendicular line to the tangent line P is T, and the angle between the perpendicular line T and the left-right center line L is R. Here, the central position C1 of the bowl portion 8 is a point approximately midway along the line connecting the front end and the rear end of the inner circumferential surface of the rim portion 16. Furthermore, in Figures 5 and 6, B1 indicates the width of the spout 18 when viewed from the front (in front of the flush toilet 1), and B2 indicates the width of the spout 18 when viewed from the direction along the perpendicular line T (directly facing the spout 18). Furthermore, in Figure 6, S1 represents the opening area of ​​the spout 18 when viewed from the front, and S2 represents the opening area of ​​the spout 18 when viewed from a direction along the perpendicular line T. In other words, opening area S1 is the apparent opening area of ​​the spout 18 when viewed from the front, and opening area S2 is the actual opening area of ​​the spout 18.

[0033] As shown in Figures 4 and 5, the spout 18 is formed in the rear half of the bowl portion 8 (the portion behind the central position C1 of the bowl portion 8), in a top view, forward of a position where the angle R between the left-right center line L of the bowl portion 8 and the perpendicular line T to the tangent line P at the central position C2 of the width of the spout 18 on the curve representing the inner circumferential surface of the rim portion 16 is 45 degrees. In this embodiment, the spout 18 is formed at a position where the angle R between the left-right center line L and the perpendicular line T is 45 degrees in a top view.

[0034] Furthermore, the spout 18 is formed to be smaller on the front side than on the rear side in terms of its vertical size. Specifically, the spout 18 is formed such that the vertical length of its opening gradually decreases from the rear side to the front side (see Figure 6). In this embodiment, the spout 18 opens to the right side of the rim portion 16 in the rear half of the bowl portion 8, and its vertical length gradually decreases from the left side (right side in Figures 6(a) and (b)) to the right side (left side in the same figure). The spout 18 is also roughly trapezoidal in shape and has a roughly symmetrical shape in the vertical direction. Therefore, the spout 18 has a long side on the rear side, a short side on the front side, and upper and lower slanted sides as the edges that form its opening. Furthermore, the spout 18 is formed so that its lower end contacts the upper edge of the waste receiving surface 14 (the boundary between the waste receiving surface 14 and the rim portion 16). This allows the washing water to be evenly discharged from the spout 18 onto the waste receiving surface 14. In addition, since the spout 18 opens onto the inner circumferential surface of the vertically rising rim portion 16, the spout 18 can be made less visible from above, thereby improving the aesthetic design.

[0035] Here, since the spout 18 is formed at a position where the angle R is 45 degrees when viewed from above, the width of the spout 18 when viewed from the front is different from the width of the spout 18 when viewed from the direction opposite to the opening of the spout 18 (along the perpendicular line T). Specifically, the width B1 of the spout 18 when viewed from the front is smaller than the width B2 of the spout 18 when viewed from the direction opposite to the opening of the spout 18 (directly facing it). More specifically, since the spout 18 is formed at a position where the angle R is 45 degrees when viewed from above, the ratio of the sizes of B1 and B2 is approximately "B1:B2 = 1:1.4 (equivalent to the square root of 2)".

[0036] Furthermore, as shown in Figure 6, the direction when viewing the spout 18 from the front and the direction when viewing the spout 18 from the direction opposite to the opening of the spout 18 are both directions on the horizontal plane. Therefore, the vertical length of the spout 18 does not change significantly when viewed from the front or from the direction opposite to the opening of the spout 18. Consequently, the ratio of the opening area S1 of the spout 18 when viewed from the front to the opening area S2 of the spout 18 when viewed from the direction opposite to the opening of the spout 18 depends on the ratio of the widths of the spout 18, that is, the ratio of the widths B1 and B2. As mentioned above, the ratio of the widths B1 and B2 is approximately "B1:B2=1:1.4", so the ratio of the opening areas S1 and S2 of the spout 18 is approximately "S1:S2=1:1.4". In other words, the opening area S1 of the spout 18 when viewed from the front is approximately 70% of the opening area S2 when the spout 18 is viewed from the direction opposite to the spout 18.

[0037] Thus, the opening area S1 of the spout 18 when viewed from the front is smaller than the opening area S2 of the spout 18 when viewed from a direction opposite to the opening of the spout 18. Now, assuming that the spout is formed at the rear end of the rim portion 16, the opening area of ​​this spout when viewed from the front will be the same as the opening area S2 of the spout 18. In other words, the spout appears smaller when viewed from the front when the spout 18 is formed at a position where the angle R in the top view is 45 degrees than when viewed from the front when the spout is formed at the rear end of the rim portion 16. Furthermore, in the rear half of the bowl section 8, the further forward the position of the spout 18 is from the position where the angle R between the left-right center line L and the perpendicular line T in a top view is 45 degrees, the smaller the opening area S1 of the spout 18 projected forward becomes; in other words, the spout 18 appears smaller when viewed from the front.

[0038] In this embodiment, the case where the spout 18 is positioned such that the angle R between the left-right center line L and the perpendicular line T in a top view is 45 degrees has been described. However, considering the aesthetic appeal, it is more preferable if the spout 18 is positioned further forward than the position where the angle R between the left-right center line L and the perpendicular line T in a top view is 60 degrees. If the spout 18 is formed at a position where the angle R is 60 degrees when viewed from above, the ratio of the width B1 of the spout 18 when viewed from the front to the width of the spout 18 when viewed from the direction opposite to the opening of the spout 18 is "B1:B2=1:2". Therefore, the ratio of the opening area S1 of the spout 18 when viewed from the front to the opening area S2 of the spout 18 when viewed from the direction opposite to the opening of the spout 18 is approximately "S1:S2=1:2". In other words, the opening area S1 of the spout 18 when viewed from the front is about 50% of the opening area S2 of the spout 18 when viewed from the direction opposite to the opening of the spout 18. Thus, if the position of the spout 18 is forward of the position where the angle R is 60 degrees, the opening area S1 of the spout 18 when viewed from the front will be less than half the opening area S2 of the spout 18 when viewed from the direction opposite to the opening of the spout 18, which is more preferable from the viewpoint of obtaining a high level of design quality.

[0039] <Action and Function> Next, with reference to Figure 7, the operation and function of the flush toilet according to the first embodiment of the present invention will be described.

[0040] Figure 7 is a schematic diagram showing the water flow of a flush toilet according to the first embodiment of the present invention. Figure 6 is a cross-sectional view taken along the line III-III in Figure 2.

[0041] As shown in Figure 7, the flushing water discharged from the tank device 4 to the supply port 6 of the toilet bowl body 2 flows into the water conduit 20. The flushing water that flows from the supply port 6 into the water conduit 20 flows forward toward the discharge port 18. At this time, a flow straightening plate 24 is provided at the downstream end of the water conduit 20, so the flushing water flowing through the water conduit 20 flows toward the discharge port 18 while being guided by the flow straightening plate 24. Thus, a flow straightening plate 24 is provided at the downstream end of the water conduit 20, with a plate surface extending in the direction of flow and oriented vertically. This allows the water flow to be concentrated toward the discharge port 18, and the flow of water discharged from the discharge port 18 can be directed. This stabilizes the flow of water discharged from the discharge port 18. Therefore, even if the inner circumferential surface of the rim portion 16 is formed to rise vertically, it is possible to generate a good swirling flow within the bowl portion 8 while suppressing the scattering of cleaning water beyond the rim portion 16.

[0042] Furthermore, since a throttling channel 22 is formed at the downstream end of the water conduit 20, the cleaning water flowing toward the outlet 18 becomes a stable flow, and the force of the cleaning water is improved. The cleaning water, whose force has been improved by passing through the throttling channel 22, is then discharged from the outlet 18 into the bowl section 8, and a swirling flow is formed in the bowl section 8 by the cleaning water discharged from the outlet 18. As described above, since a throttling channel 22 is formed at the downstream end of the water conduit 20, the flow of the discharged water can be restricted while improving the force of the cleaning water discharged from the outlet 18. In addition, since the outlet 18 has a horizontally elongated opening, the upward flow component of the cleaning water discharged from the outlet 18 can be suppressed. Therefore, even when the inner circumferential surface of the rim portion 16 is formed to rise vertically, as in this embodiment, it is possible to improve the swirling ability of the swirling flow formed in the bowl portion 8 while suppressing the scattering of cleaning water beyond the rim portion 16. Furthermore, even when the outlet 18 formed on the inner circumferential surface of the rim portion 16 is a single hole, as in this embodiment, the throttling channel 22 can improve the swirling ability of the swirling flow formed in the bowl portion 8 while suppressing the scattering of cleaning water beyond the rim portion 16.

[0043] Furthermore, in terms of the vertical opening size of the outlet 18, the front side is smaller than the rear side. Therefore, the flow path cross-section of the front portion of the outlet 18, which is further away from the water conduit 20 (further downstream), is narrower than the flow path cross-section of the rear portion of the outlet 18. As a result, the cleaning water discharged from the outlet 18 into the bowl portion 8 flows vigorously in the tangential direction to the inner surface of the rim portion 16. Therefore, even when the inner surface of the rim portion 16 is formed to rise vertically, as in this embodiment, it is possible to generate a good swirling flow within the bowl portion 8 while suppressing splashing of cleaning water beyond the rim portion 16.

[0044] Furthermore, according to the flush toilet 1 of the first embodiment of the present invention described above, in the rear half of the bowl portion 8, the spout 18 is formed in front of a position where, in a top view, the angle between the left and right center line L of the bowl portion 8 and the perpendicular line T to the tangent line P at the central position C2 of the width of the spout 18 on the curve representing the inner circumferential surface of the rim portion 16 is 45 degrees. This makes it possible to suppress the width dimension in which the user can see the spout 18, making it difficult for the user to see the spout 18. As a result, the design of the toilet body 2 can be improved. In addition, the water outlet 18, which discharges flushing water into the bowl portion 8 to form a swirling flow, can form a sufficient swirling flow with only one hole, so the flow path from the supply port 6 to the water outlet 18, for example, the water conduit 20, can be easily constructed. Therefore, the structure of the toilet body 2 can be made simpler. Furthermore, since the water outlet 18 that discharges flushing water into the bowl portion 8 to form a swirling flow has only one hole, that is, only the water outlet 18 is provided on the inner circumferential surface of the rim portion 16, the cleanability of the rim portion 16 can be further improved.

[0045] Furthermore, according to the flush toilet 1 of the first embodiment of the present invention described above, a toilet seat is placed above the rim portion 16, and in a top view, the inner edge of the toilet seat protrudes inward from the inner surface of the rim portion 16 into the bowl portion 8. As a result, when the bowl portion 8 is viewed from above, the water outlet 18 provided on the inner surface of the rim portion 16 is hidden by the shadow of the toilet seat, which protrudes inward from the inner surface of the rim portion 16. In other words, for example, when a user standing in front of the flush toilet 1 looks into the bowl portion 8, the water outlet 18 provided on the inner surface of the rim portion 16 is difficult to see due to the toilet seat. Therefore, the water outlet 18 is difficult for the user to see, and the design of the flush toilet 1 can be improved.

[0046] As described above, the flush toilet 1 according to the first embodiment of the present invention makes it possible to improve the design of the toilet body 2 while maintaining the washability and cleanability of the toilet body 2 with a simpler configuration.

[0047] (Second embodiment) Next, with reference to Figure 8, a flush toilet according to the second embodiment of the present invention will be described.

[0048] Figure 8 is a cross-sectional view of a flush toilet according to a second embodiment of the present invention. Figure 8 is a cross-sectional view taken along the line III-III in Figure 2.

[0049] As shown in Figure 8, the flush toilet 1 according to the second embodiment of the present invention is equipped with a resin distributor 26 that guides and discharges flushing water from a tank device 4, which is a flushing water source, into a water conduit 20. The distributor 26 is a tubular member that constitutes a flow path for flushing water, and is provided inside the water conduit 20. It has an inlet 26a that communicates with the tank device 4, which is a flushing water source, and an outlet 26b that discharges the flushing water supplied from the flushing water source into the distributor 26 back into the water conduit 20.

[0050] The inlet 26a of the distributor 26 is located at the supply port 6 (see Figure 1) and is connected to the discharge port (not shown) of the tank device 4, and is also in communication with the discharge port of the tank device 4. The outlet 26b of the distributor 26 opens downstream of the rectifier plate 24 and upstream of the throttling flow path 22. Therefore, the rectifier plate 24 functions as a guide for positioning the outlet 26b of the distributor 26. In this way, the distributor 26 is arranged in a substantially straight line from the supply port 6, which faces the discharge port of the tank device 4, toward the throttling flow path 22.

[0051] When the supply of cleaning water from the tank device 4, which is the cleaning water source, begins, the cleaning water flows from the outlet of the tank device 4 into the inlet 26a of the distributor 26. The cleaning water that flows in from the inlet 26a of the distributor 26 flows through the flow path inside the distributor 26 and is discharged from the outlet 26b into the water conduit 20. The cleaning water discharged from the outlet 26b of the distributor 26 into the water conduit 20 then passes through the throttling flow path 22 and is discharged from the outlet 18 into the bowl section 8.

[0052] Thus, since the flush toilet 1 according to the second embodiment is equipped with a distributor 26, in addition to the effects of the first embodiment described above, the shape of the flush toilet 1 from the flushing water source to the water outlet 18, such as the shape of the flow path of the water conduit 20, can be made simpler. As a result, the mold for manufacturing the flush toilet 1 can be simplified, and the productivity of the flush toilet 1 can be improved. Furthermore, the presence of the distributor 26 allows the flow of water within the water conduit 20 to be restricted within the pipe by the distributor 26. This further stabilizes the flow of flushing water discharged from the outlet 18. In addition, since the distributor 26 is made of resin, which has higher dimensional accuracy than ceramic, it can suppress variations in the water flow rate between flush toilets 1. As a result, it is possible to further suppress splashing of flushing water beyond the rim 16 while effectively generating a swirling flow within the bowl 8.

[0053] Furthermore, if a distributor 26 is provided, as in the flush toilet 1 according to the second embodiment, the rectifier plate 24 may not be provided. Alternatively, the flow path of the distributor 26 may be extended, and the outlet 26b of the distributor 26 may be located at a position that substantially coincides with the water outlet 18. In this case, the throttling flow path 22 may be formed in the flow path inside the distributor 26. Furthermore, the outlet 26b of the distributor 26 may be located upstream of the flow straightener 24 so that the flow path of the distributor 26 is shortened and the cleaning water discharged from the outlet 26b of the distributor 26 is guided to the flow straightener 24 and flows toward the discharge port 18.

[0054] (Third embodiment) Next, with reference to Figure 9, a flush toilet according to the third embodiment of the present invention will be described.

[0055] Figure 9 is a cross-sectional view of a flush toilet according to the third embodiment of the present invention. Figure 9 is a cross-sectional view along the line VI-VI in Figure 4.

[0056] As shown in Figure 9, the flush toilet 1 according to the third embodiment of the present invention is equipped with a spout cover 28 that conceals the spout 18. This spout cover 28 is provided on the inner circumferential surface of the rim portion 16. The spout cover 28 also has a plate-shaped cover body 28a that covers and conceals the entire spout 18, and a pivot support portion 28b provided on the inner circumferential surface of the rim portion 16 and at the upper end of the cover body 28a. The upper edge of the cover body 28a is pivotally supported by the pivot support portion 28b so as to be rotatable in the direction of opening the spout 18 (towards the inside of the rim portion 16) with the lateral direction as the axis of rotation.

[0057] When no cleaning water is being supplied from the tank device 4, the cover body 28a is in a downward position due to its own weight, and is biased to cover and conceal the water outlet 18. Therefore, when no cleaning water is being supplied from the tank device 4, the water outlet 18 is concealed and blocked by the cover body 28a of the water outlet cover 28. The spout cover 28 may also be configured to support the cover body 28a by a pivot support 28b so as to bias it toward the inside of the rim portion 16. In this case, a spring or the like may be provided on the pivot support 28b as a means for biasing the cover body 28a.

[0058] Furthermore, when flushing water is supplied from the tank device 4 to the toilet bowl body 2 and flows from the water conduit 20 to the spout 18, the force of the water flowing from the water conduit 20 to the spout 18 causes the cover body 28a to rotate inward towards the rim portion 16 around the pivot 28b, opening the spout 18. Then, flushing water is discharged from the spout 18 into the bowl portion 8. When the supply of flushing water from the tank device 4 stops, the cover body 28a is lowered by its own weight and biased to approach a state where it covers and conceals the spout 18, thus concealing and closing the spout 18.

[0059] As described above, the flush toilet 1 according to the third embodiment is equipped with a spout cover 28 that conceals the spout 18. Therefore, in addition to the effects of the first embodiment described above, the spout 18 can be more reliably concealed. This makes it more difficult for the user to see the spout 18, and further improves the aesthetic design of the flush toilet 1.

[0060] Furthermore, if a spout cover 28 is provided, as in the flush toilet 1 according to the third embodiment, the spout 18 can be more reliably concealed. Therefore, the spout 18 does not need to be formed in front of the position where the angle R between the left-right center line L and the perpendicular line T is 45 degrees in a top view, in the rear half of the bowl portion 8. For example, the spout 18 may be formed behind the position where the angle R between the left-right center line L and the perpendicular line T is 45 degrees in a top view, in the rear half of the bowl portion 8 (on the side where the angle R is less than 45 degrees).

[0061] (modified version) Although embodiments of the present invention have been described above, the present invention is not limited to the embodiments described above.

[0062] For example, although a configuration in which the tank device 4 functions as a water supply device has been described, other water supply devices, such as a flush valve, may also be provided.

[0063] Furthermore, the water reservoir 10 or the waste receiving surface 14 may be provided with jet water discharge holes that discharge cleaning water to efficiently discharge waste from the bowl 8 into the drain trap pipe 12.

[0064] Furthermore, although the rectifier plate 24 has been described as being integrally provided with the toilet bowl body 2, it may also be constructed as a separate component from the toilet bowl body 2. Also, for example, the rectifier plate 24 may be provided so as to be erected from the bottom surface of the water conduit 20.

[0065] Furthermore, although the configuration described shows that angle R is the angle between the left-right center line L of the bowl portion 8 and the perpendicular line T, it does not have to be the angle between the left-right center line L and the perpendicular line T of the bowl portion 8. It is sufficient if it is the angle between a straight line along the front-back direction, that is, a line parallel to the left-right center line L and the perpendicular line T.

[0066] Furthermore, although the distributor 26 was described as being made of resin, it is sufficient for it to be made of a material that can restrict the flow of water within the water conduit 20 to the conduit by the distributor 26.

[0067] Each element of the aforementioned embodiments can be combined to the extent technically possible, and such combinations are also included within the scope of the present invention insofar as they include the features of the present invention. [Explanation of Symbols]

[0068] 1 flush toilet 2 Toilet bowl 4 Tank equipment 6 supply ports 8 Bowl section 10 Reservoir 12 Drain trap pipe 12a Entrance 12b exit 14. Waste receiving surface 16 Rim section 18 Spout 20 Water conduit 22 Aperture channel 24 Rectifier plate 26 Distributors 26a Entrance 26b Exit 28 Spout cover 28a Cover body 28b Axial branch B1, B2 Width of the spout projected forward C1 Center position of the bowl section C2 Center position of the spout width L Left and right center line P tangent R angle S1, S2 Opening area of ​​the spout projected forward T perpendicular line W0 Initial water level

Claims

1. A flush toilet that cleans the toilet bowl with flushing water, A bowl portion having a bowl-shaped waste receiving surface and a rim portion formed along the upper edge of the waste receiving surface, with its inner circumferential surface rising vertically; The bowl section is provided with a water outlet that discharges cleaning water to form a swirling flow, A water channel for supplying cleaning water to the aforementioned water outlet, A distributor that discharges cleaning water from a cleaning water source into the aforementioned water conduit, Equipped with, A constricted channel is formed at the downstream end of the aforementioned water conduit. The spout is a horizontally elongated opening, and in the rear half of the bowl portion, when viewed from above, it is formed in front of a position where the angle between a straight line along the front-to-back direction of the bowl portion and a perpendicular line to the tangent line at the center of the width of the spout on the curve representing the inner circumferential surface of the rim portion is 45 degrees. The inner circumferential surface of the rim portion is formed by a flat surface that extends substantially vertically from the upper edge of the waste receiving surface, without overhanging toward the inside of the bowl portion over its entire circumference. A toilet seat is placed on top of the aforementioned rim portion. The toilet seat is provided in an annular shape along the rim portion, In a top view, the inner periphery of the toilet seat protrudes in a canopy-like manner inward from the inner surface of the rim portion over almost its entire circumference, At the downstream end of the aforementioned water conduit, a flow straightening plate is provided, in which the plate surface extending along the flow direction is oriented vertically. A flush toilet characterized by the following features.

2. The vertical size of the spout is smaller on the front side than on the rear side. The flush toilet according to feature 1.

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