Flush toilet

Abstract

To provide a wall mounted type water closet capable of improving strength of a lower part of a trap pipeline where a load is easily applied.SOLUTION: A water closet in the embodiment includes a toilet bowl body, a trap pipeline, and a skin plate, the toilet bowl body having a bowl part, a skirt part, and a reverse surface part, the bowl part serving for receiving dirt, the skirt part covering a front region of the bowl part, the reverse surface part being provided backward of the bowl part and able to be fixed to a wall surface, the trap pipeline being extended backward from the bowl part to enable the discharge of dirt from the bowl part, the trap pipeline having a rising pipe and a falling pipe, the rising pipe being communicated with a bottom of the bowl part and heading upward, the falling pipe being communicated with the rising pipe and heading downward, the skin plate being provided below the trap pipeline among the trap pipeline, the lowest end of the rising pipe and the reverse surface part at its position lower than the lowest end of the falling pipe.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The disclosed embodiments relate to a flush toilet.

Background Art

[0002] Conventionally, there has been a so-called wall-mounted flush toilet installed on the wall surface of a toilet room (see, for example, Patent Document 1). In recent years, wall-mounted flush toilets have been expanding in the market, including public places, from the viewpoints of the cleanability of the floor surface of the toilet room and the designability of the toilet or the toilet room.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in some wall-mounted flush toilets, in the toilet body, a skirt portion covers the front region of the bowl portion that receives dirt and opens the rear region of the bowl portion (does not cover the rear region of the bowl portion).

[0005] In such wall-mounted flush toilets, compared with the front region of the bowl portion covered by the skirt portion, the strength is lower at the rear of the bowl portion and the strength of the lower part of the trap pipe where stress due to the moment generated when the user sits on the toilet seat in the wall-mounted flush toilet is concentrated has room for improvement.

[0006] Further, for example, in a blow-out type flush toilet, due to the structure of ejecting the dirt in the bowl part toward the trap pipe with a strong water flow jetted from the jet outlet, the trap pipe is laid down so as not to cause stagnation of the water flow. That is, since the trap pipe is long in the front-rear direction and short in the vertical direction, the toilet inevitably has a long shape in the front-rear direction. Therefore, in the case of a wall-mounted flush toilet of the blow-out type, the stress due to the moment on the lower part of the trap pipe increases, and it becomes more necessary to take measures against the load applied to the lower part of the trap pipe.

[0007] An aspect of the embodiment aims to provide a flush toilet capable of improving the strength of the lower part of the trap pipe where load is likely to be applied in a wall-mounted type.

Means for Solving the Problems

[0008] The flush toilet according to an aspect of the embodiment includes a toilet body having a bowl part for receiving dirt, a skirt part covering a front region of the bowl part, and a back face part disposed behind the bowl part and fixable to a wall surface, a rising pipe extending rearward from the bowl part so as to be able to discharge the dirt in the bowl part, communicating with the bottom of the bowl part and rising upward, and a trap pipe having a descending pipe communicating with the rising pipe and descending downward, and a curtain plate disposed below the trap pipe and disposed between the trap pipe, the lowermost end of the rising pipe, and a position lower than the lowermost end of the descending pipe in the back face part.

[0009] According to such a configuration, since it is not covered by the skirt part, the lower part of the trap pipe, which is located behind the bowl part and has a lower strength than the front region of the bowl part and where stress due to moment concentrates in a wall-mounted flush toilet, can be reinforced by the curtain plate. In this case, the curtain plate is disposed so as to reinforce the entire lower part of the trap pipe. Thereby, the strength of the lower part of the trap pipe where load is likely to be applied can be improved.

[0010] Further, in the above-described flushing toilet, the lower edge of the curtain plate continuously changes with a predetermined curvature from the lowermost end of the riser pipe to the back surface portion.

[0011] According to such a configuration, since the lower edge of the curtain plate continuously changes with a predetermined curvature, it is possible to eliminate (or reduce) the location where stress due to moment concentrates on the curtain plate. Thereby, the strength of the lower part of the trap pipe, where load is likely to be applied, can be further improved.

[0012] Further, in the above-described flushing toilet, the lower edge of the curtain plate has a convex shape facing upward from the lowermost end of the riser pipe to the back surface portion.

[0013] According to such a configuration, since the lower edge of the curtain plate has a convex shape facing upward, while eliminating the location where stress due to moment concentrates on the curtain plate, the area of the curtain plate can be suppressed. Thereby, the strength of the lower part of the trap pipe, where load is likely to be applied, can be improved, the weight of the flushing toilet 1 can be reduced, and furthermore, the design can be improved.

[0014] Further, in the above-described flushing toilet, the back surface portion is connected to the lower edge of the curtain plate so that the curvature is continuous from the lower edge of the curtain plate.

[0015] According to such a configuration, since the back surface portion is connected to the lower edge of the curtain plate so that the curvature is continuous from the lower edge of the curtain plate, it is possible to avoid stress concentration at the connection location between the lower edge of the curtain plate and the back surface portion. Also, by avoiding stress concentration at the connection location between the lower edge of the curtain plate and the back surface portion, a structure is formed in which the thickness of the curtain plate with respect to the compressive stress in the front-rear direction is compensated by the back surface portion, and the strength of the curtain plate itself can be improved.

Effect of the Invention

[0016] According to one aspect of the embodiment, it is possible to improve the strength of the lower part of the trap pipe, where load is likely to be applied, in the wall-mounted type.

Brief Description of the Drawings

[0017]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Modes for Carrying Out the Invention

[0018] Hereinafter, with reference to the accompanying drawings, embodiments of the flushing toilet disclosed in the present application will be described in detail. Note that the present invention is not limited by the embodiments shown below.

[0019] <First Embodiment> With reference to FIGS. 1 to 4, the flushing toilet 1 according to the first embodiment will be described. FIG. 1 is a side view showing the flushing toilet 1 according to the first embodiment.

[0020] FIGS. 2 and 3 are perspective views showing the flushing toilet 1 according to the first embodiment, respectively. Note that FIG. 2 shows a view of the flushing toilet 1 according to the first embodiment seen from obliquely above, and FIG. 3 shows a view of the flushing toilet 1 according to the first embodiment seen from obliquely below. FIG. 4 is a side cross-sectional view showing the flushing toilet 1 according to the first embodiment. Note that FIG. 4 is a cross-sectional view taken along line A-A (central cross-section in the left-right direction) in FIG. 2.

[0021] In addition, each of the figures including FIGS. 1 to 4 shows a three-dimensional orthogonal coordinate system including a Z-axis with the vertically upward (upward) direction as the positive direction. Hereinafter, for convenience of explanation, the positive direction of the X-axis is defined as the rightward direction, the negative direction of the X-axis is defined as the leftward direction, the positive direction of the Y-axis is defined as the forward direction, and the negative direction of the Y-axis is defined as the backward direction. For this reason, the X-axis direction may be referred to as the left-right direction, the Y-axis direction may be referred to as the front-back direction, and the Z-axis direction may be referred to as the up-down direction.

[0022] As shown in FIG. 1, the water-washing toilet bowl 1 is a wall-mounted type installed on the wall surface WS of the toilet room TR. Such a wall-mounted water-washing toilet bowl 1 can improve these design properties because of the good cleanability of the floor surface FS of the toilet room TR and the good appearance of the entire water-washing toilet bowl 1 or the toilet room TR.

[0023] In addition, the water-washing toilet bowl 1 is a so-called blow-out type that ejects cleaning water with a strong water flow from a jet outlet 4 (see FIG. 4) described later toward a trap pipe 3 described later to generate a strong water flow, thereby blowing off dirt to the downstream side. Note that the water-washing toilet bowl 1 may be of other types, for example, a wash-down type or a siphon type.

[0024] In addition, the water-washing toilet bowl 1 is supplied with cleaning water from a water supply device (not shown) such as a water storage tank installed above the rear part of a toilet bowl main body 2 described later. When the water supply device is a water storage tank, it is connected to a water supply such as a water supply pipe. For example, when an operation lever (not shown) provided on the water storage tank is operated to start toilet bowl cleaning, a drain valve (not shown) of the water storage tank opens, and a predetermined amount of cleaning water is supplied from the water storage tank to a supply port 241 of the toilet bowl main body 2 described later. Note that the water supply device may be, for example, a flush valve capable of supplying a predetermined amount of cleaning water.

[0025] In addition, the water-washing toilet bowl 1 is entirely made of pottery. Note that the water-washing toilet bowl 1 may be made of resin in addition to pottery, or may be manufactured by combining pottery and resin.

[0026] As shown in FIGS. 2 to 4, the flushing toilet 1 includes a toilet body 2 and a trap pipeline 3. The toilet body 2 includes a bowl portion 21, a rim portion 22, a shelf portion 23, a water guide passage 24, a skirt portion 25, a back surface portion 26, and curtain plates 27 and 28.

[0027] The bowl portion 21 is a part for receiving dirt and is formed in a bowl shape. The bottom of the bowl portion 21 becomes a water storage portion 211 and stores a predetermined amount of stored water. A trap pipeline 3 is connected to the lower end of the water storage portion 211.

[0028] The rim portion 22 is disposed at the upper edge of the bowl portion 21 and is formed in an annular shape over the entire circumference as the upper edge of the bowl portion 21. As shown in FIG. 4, a shelf portion 23 is disposed below the rim portion 22. The shelf portion 23 is formed as a substantially flat surface extending outward from the upper edge of the bowl portion 21 inside the rim portion 22 and is formed in an annular shape over substantially the entire circumference of the bowl portion 21.

[0029] The water guide passage 24 extends forward from the water supply port 241 of the washing water and is connected to the rim water passage 221 of the rim portion 22. The water guide passage 24 extends from near the water supply port 241 disposed substantially at the center in the left - right direction at the rear of the toilet body 2 toward the bowl portion 21.

[0030] In the water guide passage 24, for example, the washing water is rectified well and the directivity of the washing water is enhanced, so that the flow of the washing water rectified in the direction of circulating through the rim water passage 221 from the water guide passage 24 and having a relatively strong water potential state is discharged as the washing water.

[0031] Also, the water guide passage 24 is formed such that, for example, a part of it is parallel to a part of the confluence portion of the rim water passage 221. In this case, near the outlet of the water guide passage 24, that is, near the water discharge port (not shown) of the washing water, since it is substantially in agreement with the direction of the flow of the washing water circulating through the rim water passage 221, the washing water from the outlet (water discharge port) of the water guide passage 24 can be made to flow in a state of maintaining the water potential (a state of substantially maintaining the flow rate and flow velocity) in the same turning direction as the rim water passage 221 while circulating through the rim water passage 221.

[0032] As shown in FIGS. 2 and 3, the skirt portion 25 is disposed so as to cover the front region of the bowl portion 21. The skirt portion 25 forms the outer shape of the flush toilet 1 in the front region of the bowl portion 21. The skirt portion 25 is provided only in the front region of the bowl portion 21 and is not provided in the rear region of the bowl portion 21. For this reason, the rear region of the bowl portion 21 is open. In this way, by providing the skirt portion 25 only in the front region of the bowl portion 21, the weight of the flush toilet 1 can be reduced.

[0033] Note that the rear region of the bowl portion 21 refers to the region behind the position where the trap pipe 3, which will be described later, is connected to the rear surface portion 252 of the skirt portion 252 in a side view. On the other hand, the region in front of the position where the trap pipe 3 is connected to the rear surface portion 252 of the skirt portion 252 is referred to as the front region.

[0034] The skirt portion 25 includes a side peripheral surface portion 251 and a rear surface portion 252. The side peripheral surface portion 251 covers the bowl portion 21 from one side portion on either the left or right, through the front portion, to the other side portion on either the left or right in the front region of the bowl portion 21. The rear surface portion 252 covers the rear portion in the front region of the bowl portion 21.

[0035] The back surface portion 26 is disposed behind the bowl portion 21. The back surface portion 26 is disposed at the rearmost portion of the toilet body 2. The back surface portion 26 includes a front surface 261 to which the most downstream side of the trap pipe 3 is connected, and a rear surface 262 that is substantially parallel to, for example, the wall surface WS (see FIG. 1) that serves as the mounting surface of the flush toilet 1.

[0036] Further, the back surface portion 26 includes a mounting hole 263 that penetrates the back surface portion 26 in the front-rear direction. The back surface portion 26 is fixed to the wall surface WS by a fixture (not shown) being attached to the mounting hole 263. In this way, by fixing the back surface portion 26 to the wall surface WS, the flush toilet 1 is fixed to the wall surface WS.

[0037] As shown in FIGS. 2 to 4, the trap pipe 3 is a pipe extending rearward from the bowl portion 21 so as to be able to discharge the dirt in the bowl portion 21. The trap pipe 3 is disposed between the rear surface portion 252 of the skirt portion 25 and the front surface 261 of the back surface portion 26. The trap pipe 3 includes a riser pipe 31 and a down pipe 32.

[0038] The upstream end (front end portion) of the riser pipe 31 is connected to the bottom portion (water collecting portion 211) of the bowl portion 21. The riser pipe 31 communicates with the bottom portion (water collecting portion 211) of the bowl portion 21 and is a pipe that slopes upward, that is, rises, as it goes rearward.

[0039] The upstream end (front end portion) of the down pipe 32 is connected to the downstream end (rear end portion) of the riser pipe 31. The down pipe 32 communicates with the rear end portion of the riser pipe 31 and is a pipe that extends downward. The most downstream side of the down pipe 32 is connected to a discharge port 33 that discharges washing water and dirt from the washdown toilet 1. Note that the discharge port 33 is connected to a facility pipe 10 that serves as an external pipe of the washdown toilet 1.

[0040] In addition, when the washdown toilet 1 is of the blow-out type, since the dirt in the bowl portion 21 is jetted into the trap pipe 3 by the washing water with a strong water flow from the jet nozzle 4 (see FIG. 4), the trap pipe 3 has a shape lying in the front-rear direction, that is, a shape that is long in the front-rear direction and short in the vertical direction.

[0041] Here, returning to FIG. 1, as shown in the drawing, in the case of the wall-mounted washdown toilet 1, the lower part of the trap pipe 3 is located behind the bowl portion 21 where the strength is lower than that in the front region of the bowl portion 21 covered by the skirt portion 25 and is concentrated with the stress F due to the moment M generated when the user sits on the toilet seat (not shown) in the wall-mounted type. Therefore, it is necessary to reinforce the trap pipe 3 so as not to be damaged.

[0042] For this reason, in the present embodiment, a curtain plate 27 for reinforcing the lower part of the trap pipe 3 is provided. Further, in the present embodiment, the curtain plate 27 has a structure in which the stress F due to the moment M is not concentrated.

[0043] As shown in FIGS. 2 to 4, the curtain plate (hereinafter referred to as the first curtain plate) 27 is a plate-like member for reinforcing the trap pipe 3. The first curtain plate 27 is disposed below the trap pipe 3 with its plate surface facing the left and right sides.

[0044] Further, the first curtain plate 27 is disposed between the trap pipe 3, the lower end portion of the riser pipe 31, and the lower end portion of the back surface portion 26 in a side view. More specifically, returning to FIG. 1 and as shown by the broken line in FIG. 1, the first curtain plate 27 is located in the vicinity of the connection point between the lower portion of the trap pipe 3 and the bowl portion 21 of the riser pipe 31 in a side view, and is disposed between the lowest end portion 311 and the position P lower than the lowest end portion 321 of the downcomer 32 in the back surface portion 26 so as to be covered from above.

[0045] In this way, the first curtain plate 27 is located behind the bowl portion 21 which is not covered by the skirt portion 25 and has lower strength than the front region of the bowl portion 21, and can reinforce the lower portion of the trap pipe 3 where the stress F due to the moment M is concentrated in the wall-mounted flushing toilet 1. In this case, the first curtain plate 27 is disposed so as to reinforce the entire lower portion of the trap pipe 3. Thereby, the strength of the lower portion of the trap pipe 3 where the load is likely to be applied can be improved.

[0046] In the present embodiment, the first curtain plate 27 is connected to the lowest end position of the back surface portion 26 as the position P lower than the lowest end portion 321 of the downcomer 32 in the back surface portion 26. Therefore, hereinafter, the position P lower than the lowest end portion 321 of the downcomer 32 in the back surface portion 26 is referred to as the "lowest end position (P)".

[0047] As shown in FIGS. 2 to 4, the lower edge portion 271 of the first curtain plate 27 continuously changes with a predetermined curvature (curvature change) from the lowest end portion 311 of the riser pipe 31 to the lowest end position P of the back surface portion 26. That is, the lower edge portion 271 of the first curtain plate 27 is formed to curve with a predetermined curvature in a side view.

[0048] Thus, since the lower edge portion 271 of the first shutter plate 27 continuously changes with a predetermined curvature, it is possible to eliminate (or reduce) the location where stress F due to moment M concentrates in the first shutter plate 27. As a result, the strength of the lower part of the trap conduit 3, where a load is likely to be applied, can be further improved.

[0049] The predetermined curvature may be a constant curvature or a variable curvature from the lowermost end portion 311 of the riser pipe 31 to the lowermost end position P of the back surface portion 26.

[0050] In the case of a variable curvature, the predetermined curvature includes a plurality of curvatures that change as it goes from the lowermost end portion 311 of the riser pipe 31 to the lowermost end position P of the back surface portion 26. Thus, when the predetermined curvature includes a plurality of curvatures, stress equalization can be achieved, for example, by reducing the curvature at the location where stress concentrates at the lower edge portion 271 of the first shutter plate 27.

[0051] Also, the lower edge portion 271 of the first shutter plate 27 has a convex shape directed upward from the lowermost end portion 311 of the riser pipe 31 to the lowermost end position P of the back surface portion 26.

[0052] Thus, since the lower edge portion 271 of the first shutter plate 27 has a convex shape directed upward, while eliminating the location where stress F due to moment M concentrates in the shutter plate 27, the area of the first shutter plate 27 can be suppressed. As a result, the strength of the lower part of the trap conduit 3, where a load is likely to be applied, can be improved, the weight of the flush toilet 1 can be reduced, and furthermore, the design can be improved.

[0053] Note that the lower edge portion 271 of the first shutter plate 27 may have a shape other than the convex shape directed upward from the lowermost end portion 311 of the riser pipe 31 to the lowermost end position P of the back surface portion 26 as described above.

[0054] Here, with reference to FIGS. 5 and 6, a modified example (first shutter plates 27A, 27B) of the first shutter plate 27 will be described. FIG. 5 is a diagram showing a first modified example (first shutter plate 27A) of the shutter plate 27. FIG. 6 is a diagram showing a second modified example (first shutter plate 27A) of the shutter plate 27.

[0055] As shown in FIG. 5, in the first shutter plate 27A according to the first modified example, its lower edge portion 271A continuously changes with a predetermined curvature (curvature change) from the lowermost end portion 311 of the riser pipe 31 to the lowermost end position P of the back surface portion 26. The first shutter plate 27A according to the first modified example has a convex shape directed downward from the lowermost end portion 311 of the riser pipe 31 to the lowermost end position P of the back surface portion 26.

[0056] Even with such a configuration, it is possible to eliminate (or reduce) the location where the stress F due to the moment M concentrates in the first shutter plate 27A, and thereby improve the strength of the lower part of the trap pipe line 3 where the load is likely to be applied.

[0057] As shown in FIG. 6, in the first shutter plate 27B according to the second modified example, its lower edge portion 271B continuously changes with a predetermined curvature (curvature change) from the lowermost end portion 311 of the riser pipe 31 to the lowermost end position P of the back surface portion 26. The first shutter plate 27B according to the second modified example has a shape (S-shaped) that changes from a convex shape upward to a convex shape downward from the lowermost end portion 311 of the riser pipe 31 to the lowermost end position P of the back surface portion 26. Note that the convex and concave portions may be arranged in reverse order in the front-rear direction in a side view. Also, they may be arranged alternately and continuously in a wave shape such as convex, concave, convex... (or concave, convex, concave...).

[0058] Even with such a configuration, it is possible to eliminate (or reduce) the location where the stress F due to the moment M concentrates in the first shutter plate 27B, and thereby improve the strength of the lower part of the trap pipe line 3 where the load is likely to be applied.

[0059] Returning to FIGS. 2 to 4, as shown in the drawings, a curtain plate (hereinafter referred to as the second curtain plate) 28 is a plate-like member for reinforcing the trap pipe 3, similar to the first curtain plate 27. The second curtain plate 28 is disposed above the trap pipe 3 with its plate surface facing the left and right sides.

[0060] Further, in a side view, the second curtain plate 28 is disposed so as to be surrounded by the lower part behind the bowl part 21 of the toilet body 2, the upper part of the trap pipe 3, and the front surface 261 of the back surface part 26.

[0061] Also, in the flush toilet 1, a jet outlet 4 for jetting washing water toward the trap pipe 3 (riser pipe 31) is provided in front of the trap pipe 3. As shown in FIG. 4, the jet outlet 4 is formed at the outlet of the jet water passage 41, and by jetting the washing water in the jet water passage 41 with a strong water force, a siphon action is generated.

[0062] According to the first embodiment described above, since it is not covered by the skirt part 25, it is located behind the bowl part 21 which has a lower strength than the front region of the bowl part 21, and in the wall-mounted flush toilet 1, the lower part of the trap pipe 3 where the stress F due to the moment M is concentrated can be reinforced by the first curtain plate 27. In this case, the first curtain plate 27 is disposed so as to reinforce the entire lower part of the trap pipe 3. Thereby, the strength of the lower part of the trap pipe 3 which is likely to be loaded can be improved.

[0063] Further, since the lower end edge part 271 of the first curtain plate 27 continuously changes with a predetermined curvature, the location where the stress F due to the moment M is concentrated in the first curtain plate 27 can be eliminated (or reduced). Thereby, the strength of the lower part of the trap pipe 3 which is likely to be loaded can be further improved.

[0064] In addition, since the lower edge portion 271 of the first shutter plate 27 is convex upward, it is possible to suppress the area of the first shutter plate 27 while eliminating the location where stress F due to moment M concentrates in the first shutter plate 27. As a result, it is possible to improve the strength of the lower part of the trap conduit 3 where a load is likely to be applied, reduce the weight of the flush toilet 1, and further improve the design property.

[0065] <Second Embodiment> The flush toilet 100 according to the second embodiment will be described with reference to FIG. 7. FIG. 7 is an explanatory view of a shutter plate (first shutter plate) 57 in the flush toilet 100 according to the second embodiment. Note that FIG. 7 shows an enlarged side view of the first shutter plate 57.

[0066] In addition, the flush toilet 100 according to the second embodiment is different from the flush toilet 1 according to the first embodiment described above in the shapes of the first shutter plate 57 and the lower end surface 264 of the back surface portion 26, and the other parts are the same as those of the flush toilet 1 according to the first embodiment. Therefore, in the following description, the description of the same parts as those of the flush toilet 1 according to the first embodiment will be omitted. Also, the same reference numerals are given to the same parts as those of the flush toilet 1 according to the first embodiment in FIG. 7.

[0067] As shown in FIG. 7, in the flush toilet 100 according to the second embodiment, the first shutter plate 57 is a plate-like member for reinforcing the trap conduit 3. The first shutter plate 57 is disposed below the trap conduit 3 with its plate surface facing the left and right sides.

[0068] In addition, the first shutter plate 57 is disposed between the trap conduit 3, the lower end portion of the rising pipe 31, and the lower end portion of the back surface portion 26 in a side view. More specifically, in a side view, the first shutter plate 57 is located between the lowest end portion 311 located near the connection point between the lower part of the trap conduit 3 and the bowl portion 21 of the rising pipe 31 and the lowest position P lower than the lowest end portion 321 of the down pipe 32 in the back surface portion 26, and is disposed so as to be covered by these from above.

[0069] The lower edge portion 571 of the first shutter plate 57 continuously changes with a predetermined curvature (curvature change) from the lowermost end portion 311 of the riser pipe 31 to the lowermost end position P of the back surface portion 26. That is, the lower edge portion 271 of the first shutter plate 57 is formed to curve with a predetermined curvature in a side view.

[0070] The predetermined curvature may be a constant curvature or a variable curvature from the lowermost end portion 311 of the riser pipe 31 to the lowermost end position P of the back surface portion 26.

[0071] In the case of a variable curvature, the predetermined curvature includes a plurality of curvatures such that the curvature changes as it goes from the lowermost end portion 311 of the riser pipe 31 to the lowermost end position P of the back surface portion 26. Thus, when the predetermined curvature includes a plurality of curvatures, for example, by reducing the curvature at the location where stress concentrates at the lower edge portion 571 of the first shutter plate 57, stress can be equalized.

[0072] Also, the lower edge portion 571 of the first shutter plate 57 has a convex shape directed upward from the lowermost end portion 311 of the riser pipe 31 to the lowermost end position P of the back surface portion 26. Note that the lower edge portion 571 of the first shutter plate 57 may have a shape other than the convex shape directed upward as described above. For example, it may have a convex shape directed downward, or a shape that changes from a convex shape upward to a convex shape downward (from a convex shape downward to a convex shape upward) (S-shaped), or a wavy shape in which convex and concave alternate continuously.

[0073] Also, as shown in FIG. 7, the back surface portion 26 has a shape such that its lower end surface 264 is connected to the lower edge portion 571 so that the curvature is continuous from the lower edge portion 571 of the first shutter plate 57.

[0074] In this way, by connecting the lower end surface 264 of the back surface portion 26 to the lower edge portion 571 so that the curvature is continuous from the lower edge portion 571 of the first shutter plate 57, it is possible to avoid stress concentration at the connection location between the lower edge portion 571 of the first shutter plate 57 and the back surface portion 26.

[0075] According to the second embodiment as described above, the lower part of the trap pipe 3, which is located behind the bowl part 21 and has a lower strength than the front region of the bowl part 21 because it is not covered by the skirt part 25 and where the stress F due to the moment M concentrates in the wall-mounted flushing toilet 1, can be reinforced by the first curtain plate 57. In this case, the first curtain plate 57 is disposed so as to reinforce the entire lower part of the trap pipe 3. Thereby, the strength of the lower part of the trap pipe 3, which is liable to be loaded, can be improved.

[0076] Further, since the lower edge part 571 of the first curtain plate 57 continuously changes with a predetermined curvature, the location where the stress F due to the moment M concentrates in the first curtain plate 57 can be eliminated (or reduced). Thereby, the strength of the lower part of the trap pipe 3, which is liable to be loaded, can be further improved.

[0077] Further, since the lower edge part 571 of the first curtain plate 57 has a convex shape directed upward, while eliminating the location where the stress F due to the moment M concentrates in the first curtain plate 57, the area of the first curtain plate 57 can be suppressed. Thereby, the strength of the lower part of the trap pipe 3, which is liable to be loaded, can be improved, the weight of the flushing toilet 100 can be reduced, and furthermore, the design property can also be improved.

[0078] Further, since the lower end surface 264 of the back surface part 26 is connected to the lower edge part 571 so that the curvature is continuous from the lower edge part 571 of the first curtain plate 57, it is possible to avoid stress concentration at the connection location between the lower edge part 571 of the first curtain plate 57 and the back surface part 26. Also, by avoiding stress concentration at the connection location between the lower edge part 571 of the first curtain plate 57 and the back surface part 26, a structure is formed in which the thickness of the first curtain plate 57 against the compressive stress in the front-rear direction is supplemented by the back surface part 26, and the strength of the first curtain plate 57 itself can be improved.

[0079] In the above-described embodiment, the lower edge portion 271 (571) of the first curtain plate 27 (57) continuously changes with a predetermined curvature (curvature change). However, it may be configured to be linearly connected from the lowermost end portion 311 of the riser pipe 31 to the lowermost end position P of the back surface portion 26. Even with such a configuration, it is possible to eliminate (or reduce) the location where the stress F due to the moment M concentrates in the first curtain plate 27 (57).

[0080] Further effects and modifications can be easily derived by those skilled in the art. Therefore, the broader aspects of the present invention are not limited to the specific details and representative embodiments presented and described as above. Accordingly, various changes can be made without departing from the spirit or scope of the general inventive concept defined by the appended claims and their equivalents.

Explanation of Reference Numerals

[0081] 1,100 Water-washing toilet 2 Toilet body 3 Trap pipeline 21 Bowl portion 25 Skirt portion 26 Back surface portion 27,57 Curtain plate (first curtain plate) 31 Riser pipe 32 Downcomer 211 Bottom portion (water storage portion) 271,571 Lower edge portion 311 Lowermost end portion 321 Lowermost end portion P Position (lowermost end position) WS Wall surface

Claims

1. A toilet body having a bowl part for receiving dirt, a skirt part covering the front region of the bowl part, and a back face part disposed behind the bowl part and fixable to a wall surface; A trap pipeline having a riser pipe extending rearward from the bowl part so as to be able to discharge the dirt in the bowl part, communicating with the bottom of the bowl part and rising upward, and a downcomer communicating with the riser pipe and extending downward; A curtain plate disposed below the trap pipeline, formed in a flat plate shape, and disposed vertically so as to connect the trap pipeline, the lowermost end of the riser pipe, and a position lower than the lowermost end of the downcomer in the back face part; Comprising; The lower edge of the curtain plate is; Formed from the lowermost end of the riser pipe to the connection point of the curtain plate in the back face part, continuously changing with a predetermined curvature, Being a convex shape directed upward from the lowermost end of the riser pipe to the connection point of the curtain plate in the back face part; Characterized in that it is a flush toilet.

2. The lowermost end of the back face part is; Connected to the lower edge so that the curvature is continuous from the lower edge of the curtain plate; The flush toilet according to claim 1, characterized in that.

Images