Water-washable toilet

Abstract

To provide a flush toilet that can secure the necessary width for the shelf section, ensure sufficient cleaning performance, and reduce the dimensions of the flush toilet in the front-to-back direction. [Solution] The present invention relates to a flush toilet (1) in which a flushing shelf for guiding flushing water is provided in the bowl portion, comprising a bowl portion (2), a shelf portion (2a) provided above the bowl portion for guiding flushing water to the bowl portion, an overhang portion (2b) formed above the shelf portion so as to protrude toward the inner circumference of the bowl portion, and an outer peripheral wall surface (8) formed so as to surround the outside of the bowl portion, wherein the outer peripheral wall surface is configured such that the angle of inclination changes abruptly at a connection point (8c) located above the upper surface of the shelf portion, and the upper outer peripheral wall surface (8a) above the connection point and the lower outer peripheral wall surface (8b) below the connection point are inclined in a direction that widens toward upward, and the upper outer peripheral wall surface has an angle of inclination that is closer to vertical than the lower outer peripheral wall surface.

Description

Technical Field

[0006] , ,

[0001] The present invention relates to a flush toilet, and more particularly to a flush toilet in which a washing shelf for guiding washing water is provided in a bowl portion.

Background Art

[0002] Japanese Patent Application Laid-Open No. 2006-104936 (Patent Document 1) describes a flush toilet. This flush toilet includes a bowl portion, a shelf portion provided above the bowl portion, and an overhanging rim portion extending so as to cover the upper side of the shelf portion. And, at the time of toilet washing, by guiding washing water along the shelf portion, a swirling flow is generated in the bowl portion, and it is configured to wash the bowl surface of the bowl portion.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the flush toilet described in Patent Document 1, if an attempt is made to secure a sufficient width of the shelf portion in order to generate a necessary swirling flow, there is a problem that the occupied area of the flush toilet becomes large. In particular, if an attempt is made to secure a shelf with a necessary width at the front portion of the bowl portion, there is a problem that the front end of the flush toilet protrudes greatly forward, and the dimensions of the flush toilet in the front-rear direction become large.

[0005] Therefore, an object of the present invention is to provide a flush toilet that can secure a necessary width of the shelf portion and suppress the dimensions of the flush toilet in the front-rear direction while ensuring sufficient washing performance.

Means for Solving the Problems

[0006] To solve the above-mentioned problems, the present invention provides a flush toilet in which a flushing shelf for guiding flushing water is provided in the bowl portion, comprising a bowl portion, a shelf portion provided above the bowl portion for guiding flushing water to the bowl portion, an overhang portion formed above the shelf portion so as to protrude toward the inner circumference of the bowl portion, and an outer peripheral wall surface formed so as to surround the outside of the bowl portion, wherein the outer peripheral wall surface is configured such that the angle of inclination changes abruptly at a connection point located above the upper surface of the shelf portion, and the upper outer peripheral wall surface above the connection point and the lower outer peripheral wall surface below the connection point are inclined in a direction that widens toward upward, and the upper outer peripheral wall surface has an angle of inclination that is closer to vertical than the lower outer peripheral wall surface.

[0007] According to the present invention configured in this way, the angle of inclination of the outer peripheral wall surface of the flush toilet bowl changes abruptly at the connection point located above the upper surface of the shelf, and the upper outer peripheral wall surface above the connection point has an angle of inclination that is closer to vertical than the lower outer peripheral wall surface. As a result, it is possible to secure a shelf with sufficient width in front of the bowl while suppressing the dimensions of the flush toilet bowl in the front-to-back direction.

[0008] In the present invention, preferably, the connection point is located on the bonding line formed by bonding the lower and upper portions of the flush toilet bowl together after they have been molded separately during manufacturing.

[0009] According to the present invention configured in this way, since the connection point is located on the bonding line between the lower and upper parts, which are molded separately during manufacturing, the shelf portion below the connection point is formed by the lower part, and the configuration of the shelf portion can be guaranteed solely by the shape of the lower part, making it easy to ensure cleaning performance in line with the design intent.

[0010] In the present invention, preferably, the outer peripheral wall surface is configured such that a connection point where its inclination angle changes abruptly exists at least from the front end to the rear end of the bowl portion.

[0011] According to the present invention configured in this way, since the connection points on the outer periphery wall surface are present at least from the front end to the rear end of the bowl portion, it is possible to secure a shelf portion of the necessary width on the side of the bowl portion while also suppressing the width dimension of the flush toilet.

[0012] In the present invention, preferably, in a vertical cross-section extending in the front-to-back direction from the center of the width direction of the bowl portion, the upper outer wall surface is substantially straight, and the lower outer wall surface is a curved shape that is convex downwards.

[0013] According to the present invention configured in this way, the outer peripheral wall surface is composed of an upper outer peripheral wall surface that is substantially straight and a lower outer peripheral wall surface that is a downwardly convex curve. Therefore, the upper outer peripheral wall surface above the connection point can be firmly supported from below by the lower outer peripheral wall surface, which has a curved shape with a large radius of curvature. This suppresses deformation of the upper outer peripheral wall surface due to its own weight before firing during manufacturing. [Effects of the Invention]

[0014] According to the flush toilet of the present invention, it is possible to secure the necessary width for the shelf section and ensure sufficient cleaning performance while suppressing the dimensions of the flush toilet in the front-to-back direction. [Brief explanation of the drawing]

[0015] [Figure 1] This is a perspective view of a flush toilet according to an embodiment of the present invention. [Figure 2] This is a side cross-sectional view of a flush toilet according to an embodiment of the present invention. [Figure 3] This is a top view of a flush toilet according to an embodiment of the present invention. [Figure 4] This is a partially enlarged cross-sectional view showing the front end of the bowl portion in a flush toilet according to an embodiment of the present invention. [Figure 5] This is a schematic diagram showing the manufacturing procedure for a flush toilet according to an embodiment of the present invention. [Modes for carrying out the invention]

[0016] Next, referring to the accompanying drawings, a flushing toilet according to an embodiment of the present invention will be described. FIG. 1 is a perspective view of a flushing toilet according to an embodiment of the present invention. FIG. 2 is a side sectional view of the flushing toilet according to an embodiment of the present invention. FIG. 3 is a top view of the flushing toilet according to an embodiment of the present invention. Note that FIG. 2 shows the state where the washing water tank is removed.

[0017] As shown in FIG. 1, a flushing toilet 1 according to an embodiment of the present invention includes a bowl portion 2 and a drainage trap pipe 4 (FIG. 2) extending from the lower portion of the bowl portion 2. Further, a washing water tank 6 is placed behind the bowl portion 2 of the flushing toilet 1, and washing water for washing the bowl portion 2 is stored in the washing water tank 6. That is, the flushing toilet 1 of the present embodiment is a two-piece type flushing toilet having a ceramic washing water tank placed at the rear. Furthermore, an outer peripheral wall surface 8 formed so as to surround the outside of the bowl portion 2 and a skirt portion 10 formed so as to be continuous with the lower side of the outer peripheral wall surface 8 are formed on the outer periphery of the flushing toilet 1.

[0018] The flushing toilet 1 of the present embodiment is configured such that by operating a lever handle 6a provided on the side surface of the washing water tank 6, the washing water stored in the washing water tank 6 is discharged to the bowl portion 2 of the flushing toilet 1, and the bowl portion 2 is washed.

[0019] As shown in FIGS. 2 and 3, the bowl portion 2 is a mortar-shaped recess formed on the upper surface of the flushing toilet 1, and its surface constitutes a dirt receiving surface for receiving dirt. Further, on the upper portion of the bowl portion 2, a shelf portion 2a for guiding washing water, an overhang portion 2b formed so as to project upward of the shelf portion 2a toward the inner periphery of the bowl portion 2, a first rim water discharge port 2c for discharging washing water, and a second rim water discharge port 2d are provided. Furthermore, a jet water discharge port 2e is provided at the bottom of the bowl portion 2 so as to face the inlet of the drainage trap pipe 4.

[0020] The shelf part 2a is a shelf-shaped water guide channel provided on the outer periphery of the upper end of the bowl part 2 and is provided at the upper end of the bowl part 2. That is, the shelf part 2a is a surface with a predetermined width formed at a substantially horizontal inclination angle provided at the edge of the upper end of the bowl part 2, and the washing water can be guided along this shelf part 2a.

[0021] The overhang part 2b is a part provided above the shelf part 2a so as to cover at least a part of the shelf part 2a, and is formed so as to project toward the inner periphery of the bowl part 2. This overhang part 2b prevents the washing water guided by the shelf part 2a from splashing out.

[0022] The second rim water outlet 2c is a water outlet provided at the upper right rear part of the bowl part 2, and discharges washing water onto the shelf part 2a. The washing water discharged from the second rim water outlet 2c forms a counterclockwise swirling flow in the bowl part 2 while being guided by the shelf part 2a. That is, the washing water is guided by the shelf part 2a, swirls while flowing down little by little, and washes the surface of the bowl part 2.

[0023] The first rim water outlet 2d is a water outlet provided at the upper left side part of the bowl part 2, and discharges washing water onto the shelf part 2a. The washing water discharged from the first rim water outlet 2d forms a counterclockwise swirling flow in the bowl part 2 while being guided by the shelf part 2a. Note that the number, arrangement, and direction of the swirling flow formed by the rim water outlets can be changed as appropriate.

[0024] The jet water outlet 2e is provided at the bottom of the bowl part 2 so as to discharge washing water toward the rear of the washdown toilet 1. By discharging the washing water from the jet water outlet 2e, the accumulated water and dirt in the bowl part 2 are pushed into the drain trap pipe 4, and a siphon effect is induced in the drain trap pipe 4. Note that the jet water outlet 2e can also be omitted.

[0025] Furthermore, flushing water is supplied to the second rim outlet 2c, the first rim outlet 2d, and the jet outlet 2e, respectively, via a water conduit formed inside the toilet bowl 1. That is, as shown in Figure 3, the flushing water discharged from the flushing water tank 6 flows forward through the main water channel 12a located in the center of the width direction of the toilet bowl 1, then branches to the left and right, flowing into the second rim water conduit 12b and the first rim water conduit 12c, respectively. The flushing water that flows into the second rim water conduit 12b and the first rim water conduit 12c is discharged from the second rim outlet 2c and the first rim outlet 2d, respectively. In addition, a portion of the flushing water that flows into the main water channel 12a flows into the jet water conduit 12d, flows downward, and is discharged from the jet outlet 2e.

[0026] As shown in Figure 2, the drain trap pipe 4 is a conduit that extends from the bottom of the bowl section 2 toward the rear, and consists of an upward conduit 4a that communicates with the bowl section 2, a downward conduit 4b provided downstream of the upward conduit 4a, and a top section 4c provided between the upward conduit 4a and the downward conduit 4b.

[0027] The rising pipe 4a is a pipe that extends diagonally upward from an inlet connected to the bowl section 2 towards the rear of the flush toilet 1. The inlet of the rising pipe 4a is positioned opposite the jet outlet 2e.

[0028] The descending pipeline 4b is a pipeline connected to the downstream side of the ascending pipeline 4a, and extends downward and backward from the top 4c. A drainage pipe (not shown) is connected to the downstream side of this descending pipeline 4b.

[0029] The top 4c is the highest part of the drain trap pipe 4, located between the rising pipe 4a and the descending pipe 4b. The height of this top 4c determines the water level in the bowl section 2, and the water seals the drain trap pipe 4.

[0030] The flushing water tank 6 is a tank that stores flushing water for cleaning the bowl section 2, and by opening and closing a drain valve (not shown) located inside, the discharge of flushing water from the flushing water tank 6 can be switched on and off. In this embodiment, the entire amount of flushing water is supplied from the flushing water tank 6, but the present invention can also be applied to flush toilets of a type that does not have a flushing water tank, or to flush toilets of a type in which a portion of the flushing water is supplied directly from the water supply.

[0031] Next, referring to Figure 4, the configuration of the outer wall surface of the flush toilet 1 will be explained. Figure 4 is a partially enlarged cross-sectional view showing an enlarged view of the front end of the bowl portion 2.

[0032] As shown in Figure 1, the outer perimeter wall surface 8 of the flush toilet bowl 1 extends from the middle of the toilet bowl 1 to the top, surrounding the outside of the bowl portion 2. The outer perimeter wall surface 8 is inclined upward, spreading outwards from the bowl portion 2. In other words, the outer perimeter wall surface 8 is composed of a wall surface that widens upward in a mortar-like shape. Furthermore, in this embodiment, the outer perimeter wall surface 8, which is inclined upward, extends from the front end of the flush toilet bowl 1 to the end portions 8d on both sides of the flush toilet bowl 1 (only one is shown in Figure 1). These end portions 8d of the outer perimeter wall surface 8 are located near the rear end of the bowl portion 2.

[0033] On the other hand, a skirt portion 10 is provided below the outer peripheral wall surface 8, extending to the floor, and continuing from the outer peripheral wall surface 8. This skirt portion 10 is also a wall surface formed to surround the outer perimeter of the flush toilet 1. Furthermore, the skirt portion 10 is inclined downward from the lower end of the outer peripheral wall surface 8, spreading outward from the bowl portion 2. That is, in the flush toilet 1 of this embodiment, the skirt portion 10 is configured to be inclined in the opposite direction to the outer peripheral wall surface 8. In this embodiment, the skirt portion 10 is configured to be inclined in the opposite direction to the outer peripheral wall surface 8, but the skirt portion 10 and the outer peripheral wall surface 8 may be inclined in the same direction. Also, in the region behind the end portion 8d of the outer peripheral wall surface 8, the outer peripheral surface of the flush toilet 1 is composed of a wall surface inclined in the same direction as the skirt portion 10.

[0034] Next, as shown in Figure 4, the outer peripheral wall surface 8 is configured such that the angle of inclination changes abruptly above and below the connection point 8c, which is located at a predetermined height. That is, the outer peripheral wall surface 8 is configured in a bent shape, with the angle of inclination changing abruptly between the upper outer peripheral wall surface 8a, which extends above the connection point 8c, and the lower outer peripheral wall surface 8b, which extends below the connection point 8c. On the inside of the upper outer peripheral wall surface 8a, there is an overhang portion 2b that protrudes inward towards the bowl portion, and on the inside of the lower outer peripheral wall surface 8b, there is a shelf portion 2a that guides the washing water. Thus, the connection point 8c between the upper outer peripheral wall surface 8a and the lower outer peripheral wall surface 8b is located above the upper surface of the shelf portion 2a.

[0035] Furthermore, although the inclination angle of the outer perimeter wall surface 8 changes abruptly between the upper outer perimeter wall surface 8a and the lower outer perimeter wall surface 8b, both the upper and lower outer perimeter wall surfaces 8a and 8b are inclined in a direction that widens upwards. Also, as shown in Figure 4, the upper outer perimeter wall surface 8a has an inclination angle that is closer to vertical than that of the lower outer perimeter wall surface 8b.

[0036] In this way, by configuring the outer peripheral wall surface 8 in a bent shape at the connection point 8c, and forming the upper outer peripheral wall surface 8a to have an inclination angle close to vertical, it is possible to suppress the dimensions of the flush toilet 1 in the front-to-back direction while securing a shelf portion 2a of sufficient width at the front of the bowl portion 2. That is, in the flush toilet 1 of this embodiment, the flushing water discharged from the first rim outlet 2b and the second rim outlet 2d flows toward the front end of the bowl portion 2, guided by the shelf portion 2a. Furthermore, in the flush toilet 1 of this embodiment, since sufficient width is secured in the shelf portion 2a even at the front end of the bowl portion 2, the flushing water does not easily flow down at the front end, and a sufficient amount of flushing water passes through the front end and flows toward the rear of the bowl portion 2. As a result, a sufficient counterclockwise swirling flow is generated inside the bowl portion 2, guided by the shelf portion 2a.

[0037] Furthermore, as shown in Figure 1, the connection point 8c, where the inclination angle changes abruptly between the upper outer peripheral wall surface 8a and the lower outer peripheral wall surface 8b, extends from the front end of the flush toilet 1 to the end portion 8d of the side surface of the flush toilet 1. Since this end portion 8d is located at the rear end of the bowl portion 2 in a top view of the flush toilet 1, the connection point 8c extends from the front end to the rear end of the bowl portion 2. It should be noted that the present invention can also be configured so that the connection point 8c extends further rearward than the rear end of the bowl portion 2.

[0038] In this way, by configuring the outer peripheral wall 8 such that the connection points 8c of the outer peripheral wall 8 extend from the front end to the rear end of the bowl portion 2, it is possible to secure a shelf portion 2a of the necessary width on the side of the bowl portion 2 while suppressing the width dimension of the flush toilet 1.

[0039] Furthermore, as shown in Figure 4, the upper outer peripheral wall surface 8a is configured as a nearly straight line in a vertical cross-section extending in the front-rear direction from the center of the width direction of the bowl. On the other hand, as shown in Figure 2, the lower outer peripheral wall surface 8b is configured as a downward-convex curve in a vertical cross-section extending in the front-rear direction from the center of the width direction of the bowl. By configuring the lower outer peripheral wall surface 8b as a downward-convex curve in this way, the upper outer peripheral wall surface 8a can be firmly supported from below by the curved shape of the lower outer peripheral wall surface 8b with a large radius of curvature. As a result, deformation of the upper outer peripheral wall surface 8a due to its own weight can be suppressed during the manufacturing process of the flush toilet 1 before firing.

[0040] Next, with reference to Figure 5, a method for manufacturing a flush toilet 1 according to an embodiment of the present invention will be described. Figure 5 is a schematic diagram showing the manufacturing procedure for flush toilet 1.

[0041] In this embodiment, the flush toilet 1 is manufactured by separately forming the lower portion 14a and the upper portion 14b of the flush toilet 1, as shown in Figure 5, and then bonding these lower portion 14a and upper portion 14b together. That is, during the manufacture of the flush toilet 1, the lower portion 14a is formed by applying slurry to a mold (not shown) for forming the lower portion 14a. Similarly, the upper portion 14b is formed by applying slurry to a mold (not shown) for forming the upper portion 14b.

[0042] Next, the separately molded lower portion 14a and upper portion 14b are bonded together, dried, glazed, and then fired to manufacture the flush toilet 1. Here, the lower portion 14a is molded to form the structure below the connection point 8c of the flush toilet 1, and the upper portion 14b is molded to form the structure above the connection point 8c of the flush toilet 1. Therefore, the connection point 8c that connects the upper outer wall surface 8a and the lower outer wall surface 8b corresponds to the bonding line 14c of the lower portion 14a and the upper portion 14b. Thus, during manufacturing, the connection point 8c is located on the bonding line where the lower portion 14a and the upper portion 14b of the flush toilet 1 are bonded together after they have been molded separately.

[0043] Furthermore, by manufacturing the flush toilet 1 in two parts, a lower section 14a and an upper section 14b, the shape of the lower shelf section 2a at the connection point 8c, which is crucial for ensuring the flushing performance of the flush toilet 1, is determined solely by the mold used to form the lower section 14a. As a result, it becomes easy to ensure flushing performance in line with the design intent.

[0044] According to the flush toilet 1 embodiment of the present invention, the outer peripheral wall surface 8 of the flush toilet 1 has a sudden change in inclination angle at a connection point 8c located above the upper surface of the shelf portion 2a, and the upper outer peripheral wall surface 8a above the connection point 8c has an inclination angle closer to vertical than the lower outer peripheral wall surface 8b. Therefore, it is possible to secure a shelf portion 2a of sufficient width in front of the bowl portion 2 while suppressing the dimensions of the flush toilet 1 in the front-to-back direction.

[0045] Furthermore, according to the flush toilet 1 of this embodiment, the connection point 8c is located on the adhesive line 14c where the lower portion 14a and the upper portion 14b, which are molded separately during manufacturing, are bonded together. Therefore, the shelf portion 2a below the connection point 8c is formed by the lower portion 14a, and the structure of the shelf portion 2a can be guaranteed solely by the shape of the lower portion 14a, making it easy to ensure flushing performance in line with the design intent.

[0046] Furthermore, according to the flush toilet 1 of this embodiment, the connection point 8c of the outer peripheral wall surface 8 is configured to exist at least from the front end to the rear end of the bowl portion 2. Therefore, while securing the shelf portion 2a of the necessary width on the side of the bowl portion 2, the width dimension of the flush toilet 1 can also be suppressed.

[0047] Furthermore, in the flush toilet bowl 1 of this embodiment, the outer peripheral wall surface 8 is composed of an upper outer peripheral wall surface 8a that is substantially straight and a lower outer peripheral wall surface 8b that is a downwardly convex curve. Therefore, the upper outer peripheral wall surface 8a above the connection point 8c can be firmly supported from below by the lower outer peripheral wall surface 8b, which has a curved shape with a large radius of curvature. This suppresses deformation of the upper outer peripheral wall surface 8a due to its own weight before firing during manufacturing.

[0048] Although embodiments of the present invention have been described above, various modifications can be made to the embodiments described above. In particular, in the embodiments described above, the outer periphery wall surface and the skirt portion below it were inclined in opposite directions, but the present invention can also be applied to a flush toilet in which the outer periphery wall surface and the skirt portion are inclined in the same direction and have a smoothly connected shape. Furthermore, in the embodiments described above, the present invention was applied to a flush toilet in which a rim spout and a jet spout are provided in the bowl portion, and the bowl portion is cleaned by the flushing water discharged from these spouts, but the present invention can be applied to a flush toilet with any flushing method. Also, in the embodiments described above, the entire amount of flushing water used for flushing was supplied from the flushing water tank, but the present invention can also be applied to a flush toilet in which, for example, some of the flushing water is supplied directly from the water supply. [Explanation of Symbols]

[0049] 1 flush toilet 2 Bowl section 2a shelf 2b Overhang section 2c Second rim outlet 2d First rim outlet 2e Jet nozzle 4. Drain trap pipe 4a Ascent pipeline 4b downhill pipe 4c top 6. Washing water tank 6a Lever handle 8. Outer wall surface 8a Upper outer perimeter wall surface 8b Lower outer peripheral wall 8c connection point 8d end 10 Skirt section 12a Main channel 12b Second Rim Waterway 12c First Rim Aqueduct 12d Jet water conduit 14a Lower part 14b Upper part 14c adhesive line

Claims

1. A flush toilet in which a flushing shelf for directing flushing water is provided in the bowl section, The bowl part, A shelf is provided at the top of this bowl section to guide the washing water to the bowl section, Above this shelf section, there is an overhang section formed to protrude toward the inner circumference of the bowl section, The outer peripheral wall surface is formed to surround the outside of the bowl portion, It has, The above-mentioned outer perimeter wall surface is configured such that the angle of inclination changes abruptly at a connection point located above the upper surface of the shelf, and the upper outer perimeter wall surface above the connection point and the lower outer perimeter wall surface below the connection point are inclined in a direction that widens upward, and the upper outer perimeter wall surface has an angle of inclination that is closer to vertical than the lower outer perimeter wall surface.

2. The flush toilet according to claim 1, wherein the above connection point is located on the adhesive line formed by bonding the lower and upper parts of the flush toilet together after the lower and upper parts of the flush toilet are molded separately during manufacturing.

3. The flush toilet according to claim 1, wherein the outer perimeter wall surface is configured such that a connection point where its angle of inclination changes abruptly exists at least from the front end to the rear end of the bowl portion.

4. The flush toilet according to claim 1, wherein the outer peripheral wall surface, in a vertical cross-section extending in the front-to-back direction from the center of the width direction of the bowl portion, has an upper outer peripheral wall surface that is substantially straight and a lower outer peripheral wall surface that is a curved shape that is convex downward.

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