CN106661880B - Flush toilet, toilet and flush toilet bowl - Google Patents

Abstract

A flush toilet bowl, comprising: a bedpan (110); a rim (111) formed at the upper end edge of the toilet bowl (110); an upper inner wall surface (115) that is formed on the inner surface of the toilet bowl (110) so as to be continuous with the inner peripheral edge of the upper end surface (111S) of the rim (111), and that has a greater curvature in a front region (115F) and a rear region (115R) than in both left and right side regions (115S) when viewed in plan; a shelf surface (118) formed so as to protrude inward along the lower end edge of the upper inner wall surface (115) and so as to face upward; a connecting surface (117) for connecting the lower end edge of the upper inner wall surface (115) and the outer peripheral edge of the frame surface (118); and a discharge port (127) for discharging the cleaning water so as to generate a swirling flow (129) in contact with the upper inner wall surface (115), the shelf surface (118), and the connecting surface (117), wherein the front region (117F) and the rear region (117R) of the connecting surface (117) are set at positions lower than the left and right side regions (117S) of the connecting surface (117).

Description

Flush toilet, toilet and flush toilet bowl

Technical Field

The invention relates to a flush toilet, a toilet and a flush toilet bowl.

Background

1. Patent document 1 discloses a flush toilet bowl including a toilet bowl, a rim formed along an upper end edge of the toilet bowl, an upper inner wall surface formed along an upper end edge of an inner surface of the toilet bowl, and an upward frame surface (shelf surface) projecting inward from a lower end edge of the upper inner wall surface. The washing water discharged forward along the inner wall surface of the upper part rotates while keeping the height of the washing water contacting the inner wall surface of the upper part under the action of the rack surface, and the inside of the toilet bowl is washed. In the front region of the revolving path along the upper inner wall surface, since the curvature is larger than the curvatures in the right and left side regions, the revolving washing water may be scattered upward of the rim by the centrifugal force. As a countermeasure, the width of the shelf surface is narrowed or the shelf surface is removed in the front region of the upper inner wall surface, so that the washing water easily flows down.

Documents of the prior art

Patent document

Patent document 1: japanese patent No. 4721026

Patent document 2: japanese laid-open patent publication No. 2013-194410

Patent document 3: japanese unexamined patent application publication No. 2005-98003

Patent document 4: japanese unexamined patent publication No. 2013-44176

Patent document 5: japanese patent No. 4941796

Disclosure of Invention

Technical problem to be solved by the invention

However, when the width of the shelf surface is narrowed or the shelf surface is removed as in the flush toilet bowl of patent document 1, the flow rate of the swirling flow is reduced, and therefore, in the swirling path from the front region of the upper inner wall surface toward the rear, the flow rate of the washing water is insufficient, and the washing efficiency is lowered.

The first invention has been made in view of the above conventional circumstances, and aims to solve the problem of preventing the washing water from scattering.

2. Patent document 2 discloses a conventional flush toilet. This flush toilet includes: a bedpan having a discharge port at the front side of the upper end; a basin side which is continuous from the upper end part of the toilet and expands forwards and outwards in the left-right direction; a peripheral wall continuous with the peripheral end of the basin edge and extending downward; and an upper surface portion which is widened from the upper end portion of the toilet bowl in the backward direction. In this flush toilet, an inlet port into which wash water flows is formed at the rear end portion of the upper surface portion. In the flush toilet, a water supply unit through which wash water passes is formed below an upper surface portion so as to communicate with an inlet port. The water supply unit extends forward below the upper surface portion and extends from the rear of the upper end portion of the toilet bowl to the discharge port along the outer side surface on the left side of the upper end of the toilet bowl. In the flush toilet, a step is formed so that the upper end of the toilet bowl protrudes outward, and a water supply unit through which wash water passes is formed below the rim of the toilet bowl. By adopting such a structure, the toilet bowl, the rim, the peripheral wall, the upper surface portion, and the water supply portion can be integrally formed by casting (hereinafter, integrally formed). Therefore, the number of manufacturing steps and cost of the flush toilet can be reduced.

As another conventional flush toilet, the following structures are also generally known: after the water supply unit is formed along the upper end of the toilet bowl in another step, the water supply unit is bonded to the upper end of the toilet bowl in the middle of the forming step, thereby blocking the water supply unit and the hollow portion formed between the toilet bowl and the peripheral wall and preventing the washing water from flowing into the hollow portion.

However, the flush toilet of patent document 2 is integrally formed, and a step is formed so that the upper end portion of the bowl protrudes outward in order to form a water supply portion communicating with a discharge port formed in the front side of the upper end portion of the bowl. Therefore, the appearance of the toilet bowl is poor.

The second invention has been made in view of the above conventional circumstances, and is to solve the problem of providing a flush toilet that has good appearance and can be integrally molded.

3. Patent document 3 discloses a conventional toilet. The toilet includes a standing wall portion, a connecting portion, and an intermediate wall portion. The standing wall portion extends downward from the inner periphery of the rim toward the inside. The connecting portion is formed of a curved surface that is curved so as to protrude outward from the lower end of the upright wall portion toward the inside, and the lower end portion extends toward the inside. The intermediate wall portion extends horizontally inward from the lower end of the connection portion. The intermediate wall portion is provided at a predetermined distance from the upper end edge of the upright wall portion. Therefore, the toilet can prevent the flush water flowing on the surface of the intermediate wall portion from being splashed outside the toilet, without forming an outward projection that projects the upper end portion of the upright wall portion inward so as to cover the intermediate wall portion. In addition, since the toilet does not have an outward projecting portion, the entire inside of the toilet bowl is clearly seen, stains on the surface of the toilet bowl are easily seen, and the toilet bowl can be easily cleaned.

However, in the toilet disclosed in patent document 3, the coupling portion is sharply bent and extended so as to change the direction of the inner side. Therefore, in this toilet, when urine collides with the connection portion, urine may be accumulated in the lower end portion of the standing wall portion. When urine further collides with urine accumulated at the lower end portion of the upright wall portion, splashes may be generated and may be scattered to the outside of the toilet bowl.

The third invention has been made in view of the above conventional circumstances, and it is an object of the present invention to provide a toilet capable of suppressing generation of urine droplets.

4. Conventionally, as a flush toilet that washes and discharges waste, for example, a structure described in patent document 4 is known. In this flush toilet, a discharge port is provided near the rear end of the bowl portion, and the toilet bowl portion is cleaned while the washing water discharged from the discharge port swirls so as to pass through the rear surface side of the bowl portion and reach the front surface side.

However, the flush toilet of patent document 4 is formed in a shape in which the width dimension gradually narrows toward the front end portion, and the curvature radius of the front surface side of the bowl portion becomes small, so that it is difficult to smoothly swirl the washing water and obtain a sufficient washing force. On the other hand, it is considered to increase the radius of curvature of the front surface side of the toilet bowl, but when the width of the flush toilet is increased, a dedicated toilet seat is required, which is not desirable.

The fourth invention has been made in view of the above circumstances, and an object thereof is to provide a flush toilet capable of smoothly swirling washing water to obtain a sufficient washing force.

5. Patent document 5 discloses a flush toilet bowl including: a bedpan; a rim formed along an upper end edge portion of the toilet bowl; an upper vertical inner wall surface formed along the upper end edge of the inner surface of the bedpan; and a discharge port opening to the upper vertical inner wall surface. The flush toilet bowl washes the inside of the toilet bowl with the washing water discharged from the discharge port, and discharges the waste in the toilet bowl.

In the flush toilet bowl of patent document 5, an outward protrusion is formed in the vicinity of the opening region of the discharge port in the upper vertical inner wall surface of the toilet bowl. The upper surface of the outward protrusion is connected with the horizontal upper surface of the bedpan in a manner of almost the same plane. Therefore, when the region of the upper vertical inner wall surface of the toilet bowl in which the projecting portion is formed is contaminated, there is a problem in that it is difficult to visually confirm the degree of contamination even when the toilet bowl is viewed from above.

The fifth invention has been made in view of the above-mentioned conventional circumstances, and it is an object of the present invention to provide a flush toilet bowl capable of visually observing the upper vertical inner wall surface of the toilet bowl over the entire circumference.

Technical solution for solving technical problem

1. A toilet bowl according to a first aspect of the present invention includes: a bedpan; a basin side formed at an upper end edge portion of the toilet bowl; an upper inner wall surface formed on the inner surface of the toilet bowl so as to be continuous with the inner peripheral edge of the upper end surface of the rim, the upper inner wall surface having a larger curvature in a front region and a rear region than in right and left regions in a plan view; a shelf surface formed to protrude inward along a lower end edge of the upper inner wall surface and to face upward; a connecting surface for connecting the lower end edge of the upper inner wall surface and the outer peripheral edge of the frame surface; and a discharge port for discharging the washing water so as to generate a swirling flow in contact with the upper inner wall surface, the shelf surface, and the connecting surface, wherein a front region and a rear region of the connecting surface are set at positions lower than regions on both left and right sides of the connecting surface.

2. A toilet bowl according to a second aspect of the present invention includes: a toilet bowl having a discharge port at an upper end thereof; a bowl rim extending forward and outward in the lateral direction continuously from the upper end of the bowl; a peripheral wall extending downward continuously from an outer peripheral end of the rim; and an upper surface portion extending rearward continuously from an upper end portion of the toilet bowl, wherein the flush toilet is integrally formed, and has a hollow portion formed by the toilet bowl, the rim and the peripheral wall and extending forward and downward of the toilet bowl, and a water supply space formed below the upper surface portion and communicating with the discharge port to allow wash water to pass therethrough, and the flush toilet is provided with a shield portion separating the hollow portion from the water supply space.

The flush toilet according to the second aspect of the present invention is configured such that the hollow portion and the water supply space are partitioned by the blocking portion, and therefore, the flush toilet is configured such that the flush water does not flow into the hollow portion.

3. A toilet according to a third aspect of the invention includes a toilet bowl including a standing wall portion having a surface extending in a vertical direction at an upper end portion, a coupling portion continuous with a lower end of the standing wall portion and forming a curved surface curved so that a surface thereof protrudes outward, and a lower end portion extending inward, a curvature radius of the curved surface in the vertical direction being largest at a left-right center of a front region and gradually decreasing toward left and right sides, and an intermediate wall portion continuous with a lower end of the coupling portion and forming a surface slightly inclined toward inside.

In the toilet bowl according to the third aspect of the invention, the upright wall portion and the intermediate wall portion are connected by a connecting portion formed by a curved surface curved so that the surface thereof protrudes outward. The coupling portions at the left and right center portions of the front region of the toilet bowl are portions where urine is supposed to directly collide. The portion is formed by a curved surface having the largest radius of curvature in the vertical direction. Therefore, in this toilet, when urine collides with the curved surface of the left and right center portions of the front region of the toilet bowl, the radius of curvature in the vertical direction of this portion is large, and therefore urine can easily flow. In other words, the toilet bowl can suppress retention of urine at the boundary portion between the standing wall portion and the connecting portion.

4. A toilet bowl of a fourth invention includes: a bowl portion which is substantially egg-shaped in a plan view and is cleaned by a swirling flow; a peripheral wall portion covering an outer peripheral side of the bowl portion; and a bowl portion connecting an upper end portion of the bowl portion and an upper end portion of the peripheral wall portion, wherein the bowl portion has a standing wall portion that is substantially perpendicular to an inner peripheral edge portion of the bowl portion or that hangs down inward in an inward-outward direction, and a dimension in the inward-outward direction of the bowl portion on a front surface side of the bowl portion is larger than a dimension in the inward-outward direction of the bowl portion on both right and left surface sides of the bowl portion.

5. A toilet bowl according to a fifth aspect of the present invention includes: a bedpan; a basin rim formed at an upper end edge portion of the toilet bowl; an upper vertical inner wall surface formed at an upper end portion of an inner surface of the bedpan and connected to an upper end inner peripheral edge portion of the rim over an entire circumference of the bedpan; and a discharge port that opens to the upper vertical inner wall surface and discharges washing water to generate a swirling flow in contact with the upper vertical inner wall surface.

In the fifth aspect of the invention, the orientation of the upper vertical inner wall surface that is connected at a right angle to the upper end surface of the rim is not limited to the precise vertical direction, but includes an orientation in which the upper end side is slightly inclined toward the inside of the toilet bowl with respect to the vertical direction (in other words, an orientation that forms an acute angle with the upper end surface of the rim) and an orientation in which the upper end side is slightly inclined toward the outside of the toilet bowl with respect to the vertical direction (in other words, an orientation that forms an obtuse angle with the upper end surface of the rim).

Effects of the invention

In the flush toilet bowl according to the first aspect of the invention, the turning speed is increased because the curvature is large in the front region and the rear region of the turning path, but in the first aspect of the invention, the difference in height between the upper end surface of the bowl rim and the turning path is increased by reducing the connecting surface, and therefore, the washing water is not scattered upward.

The flush toilet according to the second aspect of the present invention can be integrally molded with good appearance.

The toilet bowl according to the third aspect of the present invention can suppress the generation of urine droplets.

According to the fourth aspect of the present invention, the radius of curvature of the front surface side of the toilet bowl portion is increased while maintaining the width of the flush toilet, so that the washing water can smoothly swirl and a sufficient washing force can be obtained.

In the toilet bowl according to the fifth aspect of the invention, the upper vertical inner wall surface of the opening of the supply/discharge port is connected to the upper end surface of the bowl rim at right angles over the entire circumference and has no outward protrusion, and therefore, even when viewed from a viewpoint higher than the bowl rim, the entire area of the upper vertical inner wall surface can be visually observed over the entire circumference.

Drawings

Fig. 1 is a top view of a flush toilet bowl of example 1.

Fig. 2 is a sectional view taken along line a-a of fig. 1.

Fig. 3 is a sectional view taken along line B-B of fig. 1.

Fig. 4 is a cross-sectional view taken along line C-C of fig. 1.

Fig. 5 is a cross-sectional view taken along line D-D of fig. 1.

Fig. 6 is a perspective view showing a flush toilet according to embodiment 2.

Fig. 7 is a plan view showing a flush toilet according to embodiment 2.

Fig. 8 is a left side view showing a flush toilet of embodiment 2.

Fig. 9 is a sectional view of arrows a-a in fig. 7.

Fig. 10 is a sectional view of arrows B-B in fig. 8.

Fig. 11 is a sectional view of arrows C-C in fig. 7.

Fig. 12 is a sectional view of arrows D-D in fig. 7.

Fig. 13 is a sectional view of arrows E-E in fig. 7.

Fig. 14 is a perspective view of a toilet bowl according to embodiment 3.

Fig. 15 is a plan view showing a toilet bowl according to embodiment 3.

FIG. 16 is a left and right center sectional view of a toilet bowl according to embodiment 3.

Fig. 17 is a sectional view of an arrow a-a portion in fig. 15.

Fig. 18 is a sectional view of the arrow B-B portion in fig. 15.

Fig. 19 is a sectional view of the arrow C-C portion in fig. 15.

Fig. 20 is a sectional view of an arrow D-D portion in fig. 15.

Fig. 21 is a perspective view showing a flush toilet according to embodiment 4.

Fig. 22 is a plan view showing a flush toilet according to embodiment 4.

Fig. 23 is a sectional view showing a flush toilet according to example 4, which is a sectional view corresponding to a section at a-a in fig. 22.

Fig. 24 is a sectional view of the flush toilet according to embodiment 4, which corresponds to a section at a position B-B in fig. 22.

FIG. 25 is a top view of the flush toilet bowl of example 5.

Fig. 26 is an X-X sectional view of fig. 25.

Fig. 27 is a cross-sectional view taken along line Y-Y of fig. 25.

Fig. 28 is a cross-sectional view taken along line Z-Z of fig. 25.

Detailed Description

1. Preferred embodiments in the first invention will be described.

In the flush toilet bowl according to the first aspect of the present invention, a turning path from the front region to the rear region of the connecting surface may be smoothly continuous so as to gradually change in height.

According to this structure, since the flow resistance of the swirling flow is reduced, the cleaning efficiency becomes good.

In the flush toilet bowl according to the first aspect of the present invention, the center portion of the perimeter of the side region, which has the smallest curvature in plan view, may have the highest point in the height of the connecting surface, and the center portion may be continuously inclined downward from the highest point toward the front region and the rear region.

According to this configuration, since the region in the side region where the washing water is most difficult to scatter is the central portion of the circumferential length having the smallest curvature in plan view, the washing range of the upper inner wall surface can be widened as much as possible by setting this point to the highest point of the side region.

In the flush toilet bowl according to the first aspect of the present invention, the discharge direction of the flush water at the discharge port may be either forward or backward, and the height of the end region of the front region and the rear region of the connecting surface on the side where the flush water discharged from the discharge port reaches the first may be set lower than the height of the other end region.

The end region of the connecting surface on the side where the washing water discharged from the discharge port reaches first is higher in the revolving speed than the other end region, but the difference in height between the upper end surface of the rim and the revolving path is increased, so that the washing water does not scatter.

In the toilet bowl according to the first aspect of the present invention, the upper inner wall surface, the frame surface, and the connection surface may be symmetrical with respect to the left and right.

According to this structure, the toilet bowl can be easily manufactured, and thus cost reduction can be achieved.

In the flush toilet bowl according to the present invention, the upper inner wall surface may be a vertical surface or a surface whose upper end side is inclined outward of the toilet bowl.

< example 1 >

Hereinafter, embodiment 1 embodying the first invention will be described with reference to fig. 1 to 5. In the description of embodiment 1, the lower side in fig. 1 and the right side in fig. 2 and 3 are defined as the front side with respect to the front-rear direction. In addition, the directions shown in fig. 1, 4, and 5 are directly defined as the left and right directions. The flush toilet bowl of embodiment 1 includes a toilet bowl 110, a water discharge channel 120, and a water supply unit 123.

< bedpan 110 >

The bedpan 110 is formed into a substantially mortar shape that is opened upward. In the bedpan 110, a rim 111 is formed along an upper end portion thereof. The bowl rim 111 has a left-right symmetrical shape. The upper end surface 111S of the pot rim 111 is substantially horizontal throughout the entire circumference and is continuous at a certain height throughout the entire circumference. The lower end of the bowl 110 serves as a reservoir 112. The water reservoir 112 is disposed at the center of the toilet bowl 110 in the lateral direction (width direction). The water storage portion 112 is disposed at a position more rearward than the center in the front-rear direction of the toilet bowl 110. The inner surface of the upper end of the water reservoir 112 is formed by a substantially vertical upright wall 113. The upper end of the upright wall 113 is smoothly continuous with an inner peripheral edge of a frame surface 118 described later. The inner surface of bowl 110 forms a basin surface 114 for blocking dirt (not shown).

< upper inner wall surface 115 >

The upper end region of the bowl surface 114, that is, the inner circumferential surface of the bowl rim 111, is an upper inner wall surface 115 that is continuous over the entire circumference. The upper inner wall surface 115 is also bilaterally symmetrical as in the pot lid 111. As shown in fig. 2 to 5, the upper inner wall surface 115 is connected to the inner peripheral edge of the substantially horizontal upper end surface 111S of the bowl side 111 at a right angle via an arcuate convex surface 116 having a small radius of curvature. The upper end surface 111S and the upper inner wall surface 115 are smoothly (tangential) connected to the arcuate convex surface 116.

As shown in fig. 2 to 4, in a cross section along a vertical plane passing through the center portion of the toilet bowl 110 in a plan view, the upper end side region of the upper inner wall surface 115 is substantially linear and substantially oriented in the vertical direction. The upper inner wall surface 115 is not limited to a precise vertical surface, and may be an outwardly protruding surface whose upper end side is inclined toward the inside of the toilet bowl 110 or a surface whose upper end side is inclined toward the outside of the toilet bowl 110. The upper inner wall surface 115 and the upper end surface 111S are connected at right angles only by the arcuate convex surface 116, and are continuous over the entire circumference of the toilet bowl 110 (the bowl rim 111), and therefore no convex portion (protruding portion) or concave portion is formed on the upper inner wall surface 115. Therefore, even when viewed from a viewpoint higher than the upper end surface 111S of the bowl rim 111, the entire area of the upper inner wall surface 115 can be visually observed over the entire circumference.

As shown in fig. 1, the shape of the rim 111 is a substantially elliptical shape with the major axis (not shown) oriented in the front-rear direction in plan view. Therefore, the shape of the upper inner wall surface 115 in plan view is also a substantially elliptical shape with the major axis oriented in the front-rear direction, as in the case of the bowl rim 111. In other words, the curvature of the upper inner wall surface 115 in plan view is not necessarily constant, the front region 115F and the rear region 115R have a larger curvature than the left and right side regions 115S, and the front region 115F has a larger curvature than the rear region 115R. The front region 115F, the rear region 115R, and the left and right side regions 115S are set such that the upper inner wall surface 115 is divided into four parts in the front, rear, left, and right directions, and the four regions 115F, 115R, and 115S are arranged in a left-right symmetrical manner.

< connecting surface 117 >

The bowl surface 114 is formed with a concave coupling surface 117 that is smoothly coupled to the lower end edge of the upper inner wall surface 115 over the entire circumference. The connecting surface 117 is bilaterally symmetrical in the same manner as the upper inner wall surface 115. Since the connecting surface 117 is continuous with the upper inner wall surface 115, the curvature of the connecting surface 117 is not constant in a plan view, as in the upper inner wall surface 115. That is, the front region 117F and the rear region 117R have a greater curvature than the left and right side regions 117S, and the front region 117F has a greater curvature than the rear region 117R. The front region 117F, the rear region 117R, and the left and right side regions 117S are set such that the connecting surface 117 is divided into four parts in the front, rear, left, and right directions, and the four regions 117F, 117R, and 117S are arranged in bilateral symmetry, similarly to the upper inner wall surface 115.

Next, the height of the coupling surface 117 will be described. In embodiment 1, the "height of the coupling surface" is defined as the height of the center position in the arc length direction of the coupling surface 117 in a cross section orthogonal to the circumferential direction, and is indicated by a dashed-dotted line in the drawing. In the connecting surface 117, there is no region that is continuous at a constant height in the circumferential direction, and the height of the connecting surface 117 changes along the circumferential direction. Specifically, the height of the connecting surface 117 is set to be lower in a region where the curvature of the connecting surface 117 is larger in a plan view.

That is, the height between the front region 117F and the rear region 117R having a relatively large curvature is lower than the height between the left and right side regions 117S having a small curvature. The height of the front region 117F is set lower than the rear region 117R. In other words, the height of the connection portion 117 is set such that the side region 117S is the highest region and the front region 117F is the lowest region.

The highest peak 117H in the side region 117S is near the center of the side region 117S in the circumferential direction, that is, a portion having the smallest curvature in plan view. The height of the side region 117S continues to be lowered from the highest point 117H toward the front region 117F and the rear region 117R. The lowest position 117L in the front region 117F is the most front end having the largest curvature in the front region 117F in a plan view. The foremost position is a position where the curvature is the largest in a plan view of the entire connecting surface 117 and the lowest position is the entire connecting surface 117. The lowest position in the rear region 117R is the rearmost end of the rear region 117R having the largest curvature in plan view.

The height setting means that the difference in height between the connection surface 117 and the upper end surface 111S of the bowl rim 111 (i.e., the height of the upper inner wall surface 115) is larger as the curvature is larger. The coupling surface 117 is a smoothly continuous inclined surface whose height gradually changes over the entire circumference. In other words, there is no portion having a step-like sharp height change, no portion having a sharp angle change, or the like on the connecting surface 117.

< shelf surface 118 >

The bowl surface 114 is formed with a shelf surface 118 that is smoothly (in a tangential shape) connected to the inner peripheral edge of the connecting surface 117 over the entire circumference. The frame surface 118 is bilaterally symmetrical in the same manner as the upper inner wall surface 115 and the connecting surface 117. The shelf surface 118 faces obliquely upward, and the outer peripheral edge of the shelf surface 118 is continuously connected to the lower end edge of the upper inner wall surface 115 over the entire circumference by the connecting surface 117. The frame surface 118 is inclined so as to be lower as it is farther from the upper inner wall surface 115 (as it goes toward the center of the toilet bowl 110). The inclination angle of the shelf surface 118 with respect to the horizontal plane is not constant in the circumferential direction, and varies depending on the location, but is set to an angle smaller than 45 ° over the entire circumference.

Since the shelf surface 118 is continuous with the connection surface 117, the height of the upper end of the shelf surface 118 is set to be the same as the connection surface 117. That is, the height of the front region 118F and the rear region 118R, which are connected to the front regions 115F and 117F and the rear regions 115R and 117R of the upper inner wall surface 115 and the connecting surface 117, of the shelf surface 118 is set lower than the height of the side regions 118S connected to the left and right side regions 115S and 117S of the upper inner wall surface 115 and the connecting surface 117. The front region 118F is set to be lower in height than the rear region 118R. Similarly to the coupling surface 117, the shelf surface 118 is a smoothly continuous inclined surface whose height gradually changes over the entire circumference. In other words, there is no portion having a step-like sharp height change, no portion having a sharp angle change, or the like on the shelf surface 118.

< drainage route 120 >

As shown in fig. 2, the drain passage 120 includes an ascending passage 121 connected to the water storage unit 112 and a descending passage 122 connected to a downstream end (upper end) of the ascending passage 121. The descending path 122 is connected to a drain pipe (not shown) provided on the floor of the toilet. The water reservoir 112 is located at an inlet of the drainage channel 120. The water discharge passage 120 is arranged symmetrically in the left-right direction (width direction) of the toilet bowl 110. Before cleaning, the cleaning water is accumulated as accumulated water in the water accumulating portion 112 and the ascending path 121, and is in a water-sealed state. The filth blocked by the tub surface 114, the filth sunk into the water storage part 112, and the washing water whirling or flowing down along the tub surface 114 are discharged through the drainage path 120.

< water supply part 123 >

The water supply unit 123 is formed adjacent to the rear of the upper surface of the toilet bowl 110, for supplying the toilet bowl 110 with the washing water. The center in the lateral direction of the front end of the water supply unit 123 is continuous with the rear end edge of the rim 111, and the upper surface of the water supply unit 123 is continuous in the same plane as the upper end surface 111S of the rim 111. As shown in fig. 2 and 3, water supply unit 123 includes: a rear water supply space 124 formed to have an opened upper surface and communicating with a water supply port (not shown) of a washing tank or the like; and a front water supply space 125 positioned in front of the rear water supply space 124 and communicating with the rear water supply space 124 via a communication hole 126.

< discharge opening 127 >

A discharge port 127 for discharging the washing water supplied to the water supply unit 123 into the toilet bowl 110 is formed in the upper end portion (the rim 111) of the toilet bowl 110. The discharge port 127 is formed so as to penetrate through a partition wall 128 that partitions the upper inner wall surface 115 and the front water supply space 125. In other words, the discharge port 127 is located in the rear region 115R of the upper inner wall surface 115 and opens forward. The entire outlet 127 is open to the left of the center of the toilet bowl 110 in the left-right direction. As shown in fig. 4 and 5, the opening shape (front view shape) of the discharge port 127 is a horizontally long square as a whole, and four corners are formed in an arc shape, and are asymmetric in the vertical direction and the lateral direction.

The washing water is discharged into the toilet bowl 110 through the discharge port 127. The discharge direction of the washing water from the discharge port 127 is a direction along the upper inner wall surface 115, and is a counterclockwise direction in a plan view. In other words, discharge port 127 discharges the washing water to upper inner wall surface 115 and front regions 115F and 117F of connecting surface 117. The discharged washing water becomes swirling flow 129 flowing in contact with the lower end portion of upper inner wall surface 115, connection surface 117, and the outer peripheral edge portion of rack surface 118.

< action and Effect of example 1 >

Since the shelf surface 118 that is the swirling path of the swirling flow 129 is a gentle slope having an inclination angle of 45 ° or less with respect to the horizontal plane, the discharged swirling flow 129 almost makes a circle in the bowl surface 114 while contacting the shelf surface 118 and the connecting surface 117. Thus, the dirt adhered to the shelf surface 118 is reliably washed away by the swirling flow 129 and flows into the water reservoir portion 112. The water storage part 112 communicates with the inlet of the drain passage 120, and thus reliably discharges the washing water and the filth in the bowl 110.

In the front regions 115F, 117F, 118F or the rear regions 115R, 117R, 118R having a large curvature in a plan view in the swirling path of the swirling flow 129, the centrifugal force increases, and the circumferential velocity of the swirling flow 129 increases. Therefore, a part of the swirling flow 129 may move upward along the upper inner wall surface 115 and scatter upward of the bowl rim 111. However, in the front regions 115F, 117F, 118F and the rear regions 115R, 117R, 118R having large curvatures, the height of the connecting surface 117 and the shelf surface 118 is lower than the height of the side regions 117S, 118S, and the height difference between the swirling flow 129 and the upper end surface 111S of the bowl rim 111 is increased. Therefore, the washing water is not scattered above the tub edge 111.

Since the discharge direction of the washing water from discharge port 127 is the forward direction, the discharged washing water reaches front regions 115F, 117F, and 118F, and then reaches rear regions 115R, 117R, and 118R via right side regions 115S, 117S, and 118S. Since the flow rate (water potential) of the washing water is gradually decreased, the flow rate of the washing water in the front regions 115F, 117F, 118F is higher than that in the rear regions 115R, 117R, 118R. Also, the front regions 115F, 117F, 118F have a greater curvature than the rear regions 115R, 117R, 118R. Therefore, the washing water may be scattered upward in the front regions 115F, 117F, and 118F. However, in embodiment 1, the front regions 117F, 118F of the connecting surface 117 and the shelf surface 118 are lower in height than the rear regions 117R, 118R. In other words, the height of the connecting surface 117 and the shelf surface 118 becomes the lowest in the front regions 117F, 118F over the entire circumference. Therefore, the washing water does not scatter upward in the front regions 117F and 118F.

The toilet bowl of embodiment 1 includes a bowl 110 and a rim 111 formed at an upper end edge portion of the bowl 110. The inner surface of the toilet bowl 110 is formed with an upper inner wall surface 115 that is substantially perpendicular to the upper end surface 111S of the rim 111, and has a larger curvature in the front region 115F and the rear region 115R than in the left and right side regions 115S in a plan view. Similarly, a frame surface 118 formed to extend inward along the lower end edge of the upper inner wall surface 115 and face upward, and a connecting surface 117 connecting the lower end edge of the upper inner wall surface 115 and the outer peripheral edge of the frame surface 118 are formed on the inner surface of the toilet bowl 110. In addition, the toilet bowl 110 is provided with an outlet 127 for discharging the washing water so as to generate a swirling flow 129 in contact with the upper inner wall surface 115, the frame surface 118, and the coupling surface 117. The front region 117F and the rear region 117R of the connecting surface 117 are set at positions lower than the left and right side regions 117S of the connecting surface 117.

In the front regions 115F, 117F, 118F and the rear regions 115R, 117R, 118R of the swirling path of the swirling flow 129, the curvature is large, and thus the swirling speed is increased, but in the present embodiment, the height difference between the upper end surface 111S of the bowl rim 111 and the swirling path is increased by lowering the connecting surface 117, and therefore, the washing water is not scattered upward. Further, since it is not necessary to narrow the width of the shelf surface 118 or remove the shelf surface 118 as a countermeasure against scattering, a flow rate of the cleaning water in the swirling path is not insufficient, and a reduction in cleaning efficiency of the upper inner wall surface 115 and the shelf surface 118 can be avoided.

The discharge direction of the washing water at the discharge port 127 is set to a forward direction. Therefore, of the front and rear end regions 117F and 117R of the connecting surface 117, the front region 117F located on the front side in the discharge direction from the discharge port 127 has a higher rotation speed than the rear region 117R located on the rear side in the discharge direction. In contrast, in embodiment 1, the height of front region 117F, which is the side of front region 117F of connection surface 117F and rear region 117R where the washing water discharged from discharge port 127 reaches the first, is set lower than rear region 117R which reaches behind front region 117F. Thus, in the front region 117F, the height difference between the upper end surface 111S of the bowl rim 111 and the swirling path (swirling flow 129) is increased, and therefore, the washing water is not scattered.

Further, since the swirl paths from the front regions 117F, 118F to the rear region 117R of the connecting surface 117 smoothly continue to gradually change in height, the flow resistance of the swirl flow 129 decreases. Therefore, the swirling flow 129 has a strong water potential and maintains a high flow velocity, and therefore the cleaning efficiency is improved. Further, since the upper inner wall surface 115, the frame surface 118, and the connecting surface 117 are symmetrical to each other, the shape of the mold for molding the bedpan 110 is simplified. Thus, the manufacturing cost can be reduced.

The height of the connecting surface 117 is as follows: the central portion of the perimeter of the side region 117S, which has the smallest curvature in plan view, has a highest point 117H, and is continuously inclined downward from the highest point 117H toward the front region 117F and the rear region 117R. Since the region of the side region 117S where the washing water is most difficult to scatter is the central portion of the circumferential length having the smallest curvature in plan view, the washing range of the upper inner wall surface 115 can be expanded as much as possible by setting this point to the highest point 117H of the side region 117S.

< other embodiments >

The first invention is not limited to the embodiments described above and illustrated in the drawings, and for example, the following embodiments are also included in the technical scope of the present invention.

(1) In the above embodiment 1, the path of revolution from the front region to the rear region of the connecting surface is smoothly continuous so that the height gradually changes, but the path of revolution from the front region to the rear region of the connecting surface may have a portion in which the height changes stepwise or a portion in which the angle changes sharply.

(2) In the above embodiment 1, the front region of the front and rear end regions of the connecting surface, which is located on the side where the washing water discharged from the discharge port first reaches, is set to have a lower height than the rear region located on the rear side in the discharge direction.

(3) In the above embodiment 1, only one discharge port is provided, but a plurality of discharge ports may be provided.

(4) In example 1, the upper inner wall surface, the shelf surface, and the connecting surface are made symmetrical to the left and right, but the upper inner wall surface, the shelf surface, and the connecting surface may be asymmetrical to the left and right.

(5) In the above example 1, the shelf surface is continuous over the entire circumference, but a part of the shelf surface may be interrupted.

(6) In the above embodiment 1, the height of the connecting surface varies along the circumferential direction, but the connecting surface may be formed so that there is no region continuous at a constant height in the circumferential direction.

2. The preferred embodiment of the second invention will be described.

In the flush toilet according to the second aspect of the present invention, the shielding portion may be formed at a position rearward of the peripheral wall. In this case, since the shield portion is provided at a position rearward of the peripheral wall in the flush toilet, the shield portion can be easily manufactured at the time of molding without changing the appearance of the peripheral wall and without impairing the appearance, as compared with the case where the shield portion is provided in the peripheral wall.

In the flush toilet according to the second aspect of the present invention, the discharge port may be provided at a position rearward of the center of the toilet bowl in the front-rear direction. In this case, in the flush toilet, as the water supply space is provided rearward of the center of the bowl in the front-rear direction, the front end portion of the shielding portion can be provided rearward of the center of the bowl in the front-rear direction. In this way, the toilet bowl can extend the peripheral wall to a position rearward of the center of the toilet bowl in the front-rear direction. In other words, the flush toilet can expand the perimeter wall without steps to a position rearward of the center of the toilet bowl, and can improve the appearance.

In the toilet bowl according to the second aspect of the present invention, the shielding portion is provided with a space that is open to the outside between the cavity portion and the water supply space. In this case, in the flush toilet, the shield portion having a space between the cavity portion and the distal end portion of the water supply space can be easily integrally molded by disposing the molding die forming the space at a predetermined position during the casting molding.

In the toilet bowl according to the second aspect of the present invention, the shielding portion is provided at a position hidden by the bowl rim in a plan view when viewed from above. In this case, the flush toilet can have a good appearance because the user cannot easily see the shielding portion.

In the toilet bowl according to the second aspect of the present invention, the surface of the upper end of the bowl is vertical or slightly inclined outward toward the upper side. In this case, the entire surface of the toilet bowl can be seen in a plain view. Therefore, in the flush toilet, the stains on the surface of the toilet bowl can be easily observed, and the toilet bowl can be easily cleaned.

Next, an embodiment embodying the flush toilet of the second invention will be described with reference to the drawings.

< example 2 >

As shown in fig. 6 to 9, the flush toilet according to embodiment 2 includes a toilet bowl 210, a drain passage 230, a rim 211, a peripheral wall 212, a support wall 217, an upper surface portion 250, and a blocking portion 270.

As shown in fig. 6, 9 and 10, the bowl 210 is bowl-shaped. The bedpan 210 has a first standing wall portion 213, an intermediate wall portion 214, and a second standing wall portion 215. The first standing wall portion 213 extends in the vertical direction and is slightly inclined outward. The intermediate wall portion 214 extends from the lower end of the first standing wall portion 213 while being slightly inclined inward and downward. The second standing wall portion 215 extends from the lower end portion of the intermediate portion to a slightly downward inward side. In other words, the upper end portion of the surface of the toilet bowl 210 is formed on the surface of the first standing wall portion 213 and is slightly inclined upward and outward, the middle portion thereof is formed on the surface of the middle wall portion 214 and is slightly inclined inward and downward, and the lower end portion thereof is formed on the surface of the second standing wall portion 215 and is slightly inclined downward and inward.

As shown in fig. 9, the drain passage 230 communicates with the downstream side of the toilet bowl 210. The drainage passage 230 includes a first descending passage 231, an ascending passage 232, and a second descending passage 233. The first descending flow path 231 communicates with the downstream side of the toilet bowl 210, descends toward the rear of the toilet bowl 210, and extends. The ascending flow path 232 communicates with the downstream side of the first descending flow path 231, ascends toward the rear of the toilet bowl 210, and extends. The second descending flow path 233 communicates with the downstream side of the ascending flow path 232 and extends downward almost vertically. An opening 234 on the downstream side of the second descending flow path 233 opens downward. The toilet bowl forms a water reservoir 216 through a lower end portion of the bowl 210, the first descending flow path 231, and the ascending flow path 232.

As shown in fig. 7, the opening shape of the bedpan 210 is formed in an egg-shaped shape (front and rear are lower and upper sides in fig. 7, and the same applies to the description of the embodiment of the second invention) in which the radius of curvature of the front end portion is smaller than the radius of curvature of the rear end portion in a plan view as viewed from above. As shown in fig. 7 and 12, the first standing wall portion 213 is provided with a discharge port 218 at a middle portion in the vertical direction at a rear end portion on the left side (the left and right sides in fig. 7 and 12, the upper and lower sides in fig. 12, and the same applies to the description of the embodiment of the second invention). In other words, the discharge port 218 is provided rearward of the center of the toilet bowl 210 in the front-rear direction. The outer shape of the discharge port 218 is a substantially oblong circle shape that is long in the lateral direction. The lower end edge of the discharge port 218 is formed higher on the left side than on the right side.

The rim 211 extends substantially horizontally forward and laterally outward continuously from the upper end of the toilet bowl 210. The bowl side 211 is formed to gradually narrow from the front end toward the center of the left and right regions.

As shown in fig. 8 and 9, the peripheral wall 212 extends downward continuously from the outer peripheral end of the rim 211. The peripheral wall 212 covers the front and left and right of the bowl 210. The peripheral wall 212 is curved so as to be slightly recessed inward from the outer peripheral end of the bowl rim 211 downward. The lower portion of the peripheral wall 212 extends rearward. The lower end surface of the peripheral wall 212 is disposed on the ground. As shown in fig. 9, the support wall 217 is formed to connect the lower portion of the toilet bowl 210 and the front side of the lower end 219 of the peripheral wall 212.

As shown in fig. 6, 7, and 9, the upper surface portion 250 is continuous with the upper end portion of the bowl 210 and expands in the rearward direction. The toilet bowl has a cleaning tank mounting part 251 on which a cleaning tank (not shown) for storing cleaning water supplied to the toilet bowl 210 is mounted, at the rear of the upper surface part 250. As shown in fig. 8 and 10, left and right wall portions 252 and 253 extend downward from the left and right end portions of the upper surface portion 250, respectively. Lower ends of the left and right wall portions 252 and 253 are connected by a lower surface portion 254 substantially parallel to the upper surface portion 250.

As shown in fig. 9 and 10, the flush toilet bowl is formed with a water supply space 255 surrounded by the first upright wall portion 213 of the toilet bowl 210, the upper surface portion 250, the left and right wall portions 252 and 253, the lower surface portion 254, and the front wall 251A of the cleaning tank mounting portion 251. The water supply space 255 is provided at an upper end portion of the rear portion of the toilet bowl. The water supply space 255 communicates with the cleaning tank mounting portion 251 through a water supply hole 256 provided in the front wall 251A of the cleaning tank mounting portion 251. The water supply space 255 communicates with the inside of the toilet bowl 210 through the discharge port 218.

As shown in fig. 6, 7, 10, and 13, the upper surface portion 250 includes a pair of through holes 257 that penetrate in the vertical direction. These through holes 257 are provided at symmetrical positions with respect to the left and right center lines of the toilet. These through holes 257 pass through from the upper surface portion 250 to the lower surface portion 254. These through holes 257 are spaced apart from the water supply space 255. These through holes 257 are inserted with a mounting member for fixing a toilet seat device, not shown.

As shown in fig. 9, the toilet bowl includes a hollow portion 220 surrounded by a bowl 210, a rim 211, a peripheral wall 212, and a support wall 217. As shown in fig. 9 to 12, hollow portion 220 is formed to be widened in the front and right and left lower portions of toilet bowl 210. As shown in fig. 10, hollow portion 220 is partitioned by blocking portions 270 on both left and right sides of the rear portion of toilet bowl 210 from water supply space 255. The shielding portion 270 has a first shielding wall 270A and a second shielding wall 270B. The shield portion 270 has a space 270C that is open to the outside between the first shield wall 270A and the second shield wall 270B. The first blocking wall 270A connects the left and right rear end portions 222 of the peripheral wall 212 to the back surface of the toilet bowl 210. The second blocking wall 270B connects the front ends of the left and right wall portions 252 and 253 to the back surface of the toilet bowl 210. The upper ends of the first blocking wall 270A and the second blocking wall 270B are connected to the lower surface 221 of the tub edge 211. In other words, as shown in fig. 8 and 10, the space 270C has a concave shape surrounded by the peripheral wall 212, the left and right wall portions 252 and 253, and the lower surface 221 of the rim 211.

In this way, in this flush toilet, hollow portion 220 and water supply space 255 are partitioned by blocking portion 270 including first blocking wall 270A and second blocking wall 270B formed by sandwiching space 270C. Therefore, the flush toilet bowl is integrally formed without an additional process of forming in a subsequent process, and has a function of preventing the inflow of the washing water passing through the water supply space 255 into the cavity portion 220, and can have good appearance. As shown in fig. 8 and 12, the shielding portion 270 is provided below the rim 211. In other words, since the cover portion is provided at a position hidden by the bowl rim 211 in a plan view seen from above, the cover portion 270 is less visible when the user views the flush toilet, and a good appearance can be achieved.

As shown in fig. 8, the blocking portion 270 is provided at the rear end portion 222 of the peripheral wall 212 rearward of the center of the toilet bowl 210 in the front-rear direction. In other words, since the toilet bowl is provided with the shielding portion 270 at a position rearward of the rear end portion 222 of the peripheral wall 212, the shielding portion 270 is not formed to bite into a part of the peripheral wall 212. Therefore, the flush toilet can reduce the unevenness of the peripheral wall 212, and thus can improve the appearance.

As shown in fig. 8 and 10, the shielding portion 270 includes a first shielding wall 270A and a second shielding wall 270B formed by sandwiching a space 270C, and a space 270C is provided between the hollow portion 220 and the water supply space 255. Therefore, in this flush toilet, by arranging the molding die that forms the space 270C at the time of casting at a predetermined position, the blocking portion 270 having the space 270C between the cavity portion 220 and the water supply space 255 can be easily integrally molded.

In the flush toilet having such a configuration, since the hollow portion 220 and the water supply space 255 are partitioned by the blocking portion 270, the flush water does not flow into the hollow portion 220, and therefore, the peripheral wall 212 extending downward from the outer peripheral end portion of the rim 211 can be formed without any step even by integral molding, and the appearance can be improved.

Therefore, the flush toilet of example 2 has good appearance and can be integrally molded.

The discharge port 218 of the toilet bowl is provided rearward of the center of the toilet bowl 210 in the front-rear direction. Therefore, in this flush toilet, as the water supply space 255 is provided rearward of the center of the toilet bowl 210 in the front-rear direction, the front end portion of the shielding portion 270 can be provided rearward of the center of the toilet bowl 210 in the front-rear direction. In this way, the toilet bowl can extend the peripheral wall 212 to a position rearward of the center of the bowl 210 in the front-rear direction. In other words, in this flush toilet, since the stepped peripheral wall 212 can be expanded to a position rearward of the center of the toilet bowl 210, the appearance can be improved.

In the flush toilet according to embodiment 2, the surface of the upper end of the toilet bowl 210 is slightly inclined upward and outward. Therefore, the entire surface of the toilet bowl 210 of the flush toilet can be seen in a plain view. Therefore, in this flush toilet, stains on the surface of the toilet bowl 210 can be easily seen, and the toilet bowl 210 can be easily cleaned.

The second invention is not limited to the embodiments described above and illustrated in the drawings, and for example, the following embodiments are also included in the technical scope of the second invention.

(1) In embodiment 2, the shielding portion is seen from the lateral direction, but may be hidden by a hanging wall that hangs down from the outer peripheral end of the rim.

(2) In embodiment 2, the configuration behind the peripheral wall is not hidden, but a decorative cover may be installed for masking.

(3) In embodiment 2, the upper end surface of the toilet bowl is slightly inclined upward and outward, but may be inclined vertically or upward and inward.

(4) In embodiment 2, the discharge port is provided at one position at the rear end portion on the left side of the toilet bowl, but a plurality of discharge ports may be provided.

(5) In example 2, a space is provided between the hollow portion and the water supply space, but only a wall that partitions the hollow portion and the water supply space may be provided without providing a space.

(6) In example 2, the cleaning tank mounting portion was provided, but other water supply methods such as a direct connection type of a water pipe and a spill valve type may be adopted instead of the cleaning tank mounting portion.

(7) In embodiment 2, the support wall is provided, but may not be provided.

3. A preferred embodiment of the third invention will be described.

In the toilet according to the third aspect of the present invention, the midpoint of the vertical arc of the curved surface is lowest at the right and left centers of the front area of the toilet bowl. In this case, the coupling portion at the center of the left and right sides of the front region of the bedpan is a portion where urine is supposed to directly collide, and the midpoint of the arc in the vertical direction of this portion is the lowest, and the distance from the upper end edge of the bedpan is increased, whereby it is possible to make it difficult for urine droplets to scatter outside the bedpan.

In the toilet according to the third aspect of the invention, the surface of the upper end portion is vertical or slightly inclined outward toward the upper side. In this case, the entire surface of the toilet bowl can be seen in a plain view. Therefore, in this toilet, the stains on the surface of the toilet bowl can be easily observed visually, and the toilet bowl can be easily cleaned.

Next, an embodiment embodying the toilet bowl of the third invention will be described with reference to the drawings.

< example 3 >

As shown in fig. 14 to 17, the toilet of embodiment 3 includes a bowl 310, a drain passage 330, a rim 311, a peripheral wall 312, a support wall 317, and an upper surface portion 350.

As shown in fig. 14, 15 and 16, the bowl 310 is formed in a bowl shape. The bedpan 310 includes a first standing wall portion 313 (standing wall portion), a coupling portion 323, an intermediate wall portion 314, and a second standing wall portion 315. The surface of the first standing wall portion 313 extends in the vertical direction and is slightly inclined outward (the vertical direction is the left and right in fig. 16, the same applies to the description of the embodiment of the third invention). The surface of the coupling portion 323 is continuous with the lower end of the first standing wall portion 313, and is formed into a curved surface 323A curved so as to protrude outward, and the lower end portion extends inward. The surface of the intermediate wall portion 314 continues to the lower end of the coupling portion 323 and extends while being slightly inclined inward and downward. The surface of the second standing wall portion 315 extends downward from the lower end portion of the intermediate wall portion 314, and is slightly inclined inward. In other words, the surface of the upper end of the bedpan 310 is slightly inclined outward toward the upper side. Further, between the upper end portion and the intermediate portion of the toilet bowl 310 is a curved surface 323A curved so that the surface protrudes outward. In addition, the surface of the middle portion of the toilet bowl 310 is slightly inclined downward toward the inside. The surface of the lower end portion of the toilet bowl 310 is slightly inclined downward and inward.

As shown in fig. 14 to 16, the radius of curvature of the curved surface 323A of the coupling portion 323 in the vertical direction is largest at the left-right center of the front region 324 of the toilet bowl 310 (the left and right are the left and right in fig. 14, and the same applies to the description of the embodiment of the third invention).

As shown in fig. 16 and 17, a midpoint 325 of the vertical arc of the curved surface 323A of the coupling portion 323 is lowest at the left-right center of the front region 324 of the bowl 310 (the front side is the upper side in fig. 16, and the same applies to the description of the third embodiment).

As shown in fig. 16, the drain passage 330 communicates with the downstream side of the toilet bowl 310. The drainage path 330 includes a first descending flow path 331, an ascending flow path 332, and a second descending flow path 333. The first descending flow path 331 communicates with the downstream side of the bowl 310, descends toward the rear of the bowl 310, and extends (the rear is the lower side in fig. 16, and the same applies to the description of the embodiment of the third invention). The ascending flow path 332 communicates with the downstream side of the first descending flow path 331, ascends toward the rear of the toilet bowl 310, and extends. The second descending flow path 333 communicates with the downstream side of the ascending flow path 332 and extends downward substantially vertically. The opening 334 on the downstream side of the second descending flow path 333 opens downward. The toilet bowl includes a water reservoir 316 formed by a lower end of the bowl 310, the first descending flow path 331, and the ascending flow path 332.

As shown in fig. 15, the opening shape of the surface of the bedpan 310 is formed in an egg-shaped shape in which the radius of curvature of the front end portion is smaller than the radius of curvature of the rear end portion in a plan view seen from above. As shown in fig. 15 and 20, the toilet bowl 310 is provided with a discharge port 318 at a middle portion in the vertical direction at a left rear end portion of the first standing wall portion 313. The discharge port 318 has a substantially oblong circular shape that is laterally long. The lower edge of the discharge port 318 is formed higher on the left side than on the right side.

The rim 311 extends substantially horizontally forward and outward in the lateral direction, continuing to the upper end of the toilet bowl 310. As shown in fig. 14 and 15, the tub edge 311 is formed so as to gradually narrow from the front end toward the center of the left and right regions 326. In other words, in the toilet bowl, the radius of curvature in the circumferential direction of the upper end portion of the left and right regions 326 of the toilet bowl 310 can be reduced and the radius of curvature in the circumferential direction of the upper end portion of the front region 324 of the toilet bowl 310 can be increased without widening the left and right width of the toilet bowl in a plan view. Accordingly, the toilet can also increase the radius of curvature of the coupling portion 323 in the circumferential direction in the front region 324 of the toilet bowl 310. With this shape, even when urine collides with the curved surfaces 323A of the left and right center portions of the distal end portion of the coupling portion 323, the toilet can spread urine in the left-right direction and easily flow. In other words, this toilet can suppress urine from accumulating at the boundary between the first standing wall portion 313 and the connection portion 323, and thus suppress the splash of urine from scattering out of the toilet bowl 310.

As shown in fig. 16, 17, 18, and 19, the peripheral wall 312 extends continuously and downward along the outer peripheral end of the rim 311. The peripheral wall 312 covers the front and left and right of the bowl 310. The peripheral wall 312 is curved so as to be slightly recessed inward from the outer peripheral end of the rim 311 downward. The lower end surface of the peripheral wall 312 is disposed on the ground. As shown in fig. 16, the support wall 317 is formed to connect the lower portion of the bowl 310 and the front side of the lower end 319 of the peripheral wall 312.

As shown in fig. 14, 15, and 16, the upper surface portion 350 is continuous with the upper end portion of the bedpan 310 and expands in the rearward direction. The toilet bowl has a cleaning tank mounting portion 351 at the rear of the upper surface portion 350, on which a cleaning tank (not shown) for storing cleaning water supplied to the toilet bowl 310 is mounted. The toilet is provided with a lower surface portion 354 below the upper surface portion 350 and spaced apart from the upper surface portion.

As shown in fig. 16, the toilet bowl is formed with a water supply space 355 surrounded by the first standing wall portion 313, the upper surface portion 350, the lower surface portion 354, and the front wall 351A of the cleaning tank mounting portion 351. The water supply space 355 is provided at an upper end portion of the rear of the toilet. The water supply space 355 communicates with the wash tank mounting portion 351 via a water supply hole 356 provided in the front wall 351A of the wash tank mounting portion 351. The water supply space 355 communicates with the inside of the toilet bowl 310 through the discharge port 318. The toilet bowl is inserted into a dispenser (not shown) from the cleaning tank placing portion 351 side to the water supply port 356.

As shown in fig. 14 and 15, the upper surface portion 350 has a pair of through holes 357 provided to penetrate in the vertical direction. These through holes 357 are provided at symmetrical positions with respect to the left and right center lines of the toilet. These through holes 357 penetrate from the upper surface portion 350 to the lower surface portion 354. These through holes 357 are spaced apart from the water supply space 355. These through holes 357 are used for insertion of a mounting member (not shown) for fixing the toilet seat apparatus.

As shown in fig. 16 to 20, the toilet includes a hollow portion 320 surrounded by a bowl 310, a rim 311, a peripheral wall 312, and a support wall 317. As shown in fig. 14, the toilet bowl includes a pair of flange portions 358 at a lower end portion of the rear portion. These flange portions 358 are provided at symmetrical positions with respect to the left and right center lines of the toilet. These flange portions 358 are provided with through holes 359 at their respective intermediate portions. These through holes 359 penetrate and are provided at symmetrical positions with respect to the left and right center lines of the toilet. These through holes 359 penetrate in a direction perpendicular to the flange portions 358. These through holes 359 are used for insertion of a fixing tool (not shown) that is fixed when the toilet is installed on the floor.

In the toilet having such a configuration, the first standing wall portion 313 and the intermediate wall portion 314 are connected by the connecting portion 323 formed by the curved surface 323A curved so that the surface thereof protrudes outward. The coupling portions 323 in the left and right central portions of the front region 324 of the toilet bowl 310 are portions that are supposed to be directly collided with by urine. The portion is formed by a curved surface having the largest radius of curvature in the vertical direction. Therefore, in this toilet, when urine collides with the curved surface 323A in the right and left central portion of the front region 324 of the toilet bowl 310, the radius of curvature in the vertical direction of this portion is large, and therefore urine can easily flow. In other words, the toilet can suppress urine from staying at the boundary between the first standing wall portion 313 and the connection portion 323.

Therefore, the toilet according to the third aspect of the present invention can suppress the generation of urine droplets.

In the toilet according to embodiment 3, the midpoint 325 of the vertical arc of the curved surface 323A is lowest at the right and left centers of the front region 324 of the toilet bowl 310. Thus, in this toilet, the midpoint 325 of the arc in the vertical direction of the connecting portion 323 in the left and right central portions of the front side region 324 of the toilet bowl 310 is the lowest, and the distance from the upper end edge of the toilet bowl 310 is increased, whereby it is difficult for urine droplets to scatter toward the outside of the toilet bowl 310.

In the toilet of embodiment 3, the surface of the upper end of the toilet bowl 310 is slightly inclined outward toward the upper side. Therefore, the entire surface of the toilet bowl 310 of the toilet can be seen in a plain view. Therefore, in this toilet, stains on the surface of the toilet bowl 310 can be easily seen, and the toilet bowl 310 can be easily cleaned.

The third invention is not limited to the embodiments described above and illustrated in the drawings, and for example, the following embodiments are also included in the technical scope of the third invention.

(1) In example 3, the dispenser was used for supplying the washing water, but a method of directly connecting a tap water pipe or the like may be employed.

(2) In embodiment 3, the surface of the upper end portion of the toilet bowl is slightly inclined upward and outward, but may be inclined vertically or upward and inward.

(3) In embodiment 3, the discharge port is provided at one position at the rear end portion on the left side of the toilet bowl, but a plurality of discharge ports may be provided.

(4) In embodiment 3, a flush type is used, but the flush type may not be used.

(5) In embodiment 3, the radius of curvature of the left and right end portions of the toilet bowl is increased without increasing the left and right width of the toilet.

(6) In embodiment 3, the opening of the drainage channel opens downward, but may open rearward.

4. A preferred embodiment of the fourth invention will be described.

In the flush toilet according to the fourth aspect of the present invention, the dimension in the inward-outward direction of the bowl side portion on both the left and right sides of the bowl portion may be smallest at a substantially center in the forward-backward direction and gradually increase from this position toward the front. According to such a configuration, the radius of curvature of the left and right surfaces of the bowl portion can be reduced.

< example 4 >

Hereinafter, embodiment 4 embodying the fourth invention will be described in detail with reference to fig. 21 to 24.

The flush toilet 410 according to embodiment 4 includes a bowl portion 411, a peripheral wall portion 412 covering the outer peripheral side of the bowl portion 411, and a bowl portion 413 connecting the upper end portions thereof. The bowl portion 411, the peripheral wall portion 412, and the bowl portion 413 are integrally formed.

The bowl portion 413 is continuous from the front surface side to both the left and right surfaces of the bowl portion 411, and the rear end is connected to the upper surface wall portion 414. The upper surface wall portion 414 is a wall formed to be substantially horizontal over the entire width of the flush toilet 410. A cleaning tank mounting portion 415 is provided behind the upper surface wall portion 414 (rear end portion of the flush toilet 410). A toilet seat, not shown, is placed on the upper surface side of the bowl rim 413.

The bowl portion 411 has a bowl shape that opens upward. The bidet portion 411 includes: a standing wall portion 416 that is substantially perpendicular to or hangs inward in the inward and outward directions from the inner peripheral edge portion of the tub edge portion 413; and an inclined wall portion 418 inclined obliquely downward from the lower end of the upright wall portion 416 toward a recess portion 417 provided at a lower portion of the bowl portion 411.

A discharge port 419 (see fig. 21) for discharging the washing water is provided in the upper end peripheral edge portion of the toilet bowl portion 411. The discharge port 419 is provided on the rear surface side of the toilet bowl 411 and opens forward. The discharge port 419 is provided slightly to the right (the right as viewed by a person sitting on the flush toilet 410, the left in fig. 21) of the center of the bowl portion 411 in the width direction (the left-right direction). The washing water discharged from discharge port 419 forms a swirling flow swirling counterclockwise in bowl portion 411 in a plan view.

The flush toilet 410 has a discharge passage 421 (see fig. 23) communicating with the downstream side of the bowl portion 411. The water discharge path 421 is formed to be continuous with the downstream side of the outlet 422 provided below the water sealing surface L of the toilet bowl 411.

The drainage path 421 includes: a first downward flow path 423 obliquely downward from the flow outlet 422; an ascending flow path 424 formed continuously with the downstream side of the first descending flow path 423 and ascending diagonally rearward; and a second descending flow path 425 formed continuously with the downstream side of the ascending flow path 424 and descending in a substantially vertical direction. The lower end of the second descending flow path 425 is formed to protrude downward, and can be connected to a drain connection pipe, not shown.

The peripheral wall portion 412 covers a range from the front surface side to both the left and right surface sides of the toilet bowl portion 411, and can accommodate therein a drain connection pipe or the like disposed below the toilet bowl portion 411. The peripheral wall portion 412 hangs down inward in the inward-outward direction from the outer peripheral edge portion of the tub edge portion 413 (see fig. 24).

Further, the width dimension (the dimension in the inward-outward direction) of the bowl portion 413 on the front surface side of the bowl portion 411 is larger than the width dimension (the dimension in the inward-outward direction) of the bowl portion 413 on both the left and right surfaces sides of the bowl portion 411 (see fig. 22).

A portion of the bowl portion 413 located on both left and right side surfaces of the bowl portion 411 (hereinafter, referred to as a bowl side surface 426) has a minimum width portion 427 having a minimum width dimension at a substantially center in the front-rear direction. Then, the width of the portion of the pot side surface portion 426 on the front side of the small width portion 427 is gradually increased toward the front, and the width of the portion of the pot side surface portion 426 on the rear side of the small width portion 427 is gradually increased toward the rear.

A portion of the bowl portion 413 located on the front surface side of the bowl portion 411 (hereinafter referred to as a bowl front portion 428) has a large width portion 429 having a maximum width dimension at the approximate center in the left-right direction. The wide portion 429 of the rim front portion 428 has left and right side portions that gradually decrease in width toward the left and right sides.

The portion of the bowl portion 411 on the front surface side (the portion connected to the bowl side front surface 428) is curved with substantially the same radius of curvature ρ 1, and the portion on the rear surface side is curved with substantially the same radius of curvature ρ 2. The radius of curvature ρ 1 on the front surface side of the bowl portion 411 is larger than that of the conventional bowl portion. The radius of curvature ρ 3 on both the right and left surfaces of the toilet bowl 411 is smaller than that of the conventional toilet bowl. The radius of curvature ρ 1 on the front surface side of the bowl portion 411 is slightly smaller than the radius of curvature ρ 2 on the rear surface side, and the radii of curvature ρ 3 on the right and left surfaces of the bowl portion 411 are slightly larger than the radius of curvature ρ 2 on the rear surface side. The radii of curvature ρ 1, ρ 2, ρ 3 of the bowl 411 are bilaterally symmetrical. The circle of curvature C1 having the radius of curvature ρ 1 on the front surface side of the bidet portion 411 is arranged so as to overlap the circle of curvature C2 having the radius of curvature ρ 2 on the rear surface side of the bidet portion 411 by about half. Then, the bowl 411 has a shape close to a perfect circle and a larger opening than the conventional one.

Next, the operation and effect of example 4 configured as described above will be described.

The flush toilet 410 according to embodiment 4 includes a bowl portion 411, a peripheral wall portion 412 covering an outer peripheral side of the bowl portion 411, and a bowl portion 413 connecting an upper end of the bowl portion 411 and an upper end of the peripheral wall portion 412, and a dimension in an inward-outward direction of the bowl portion 413 on a front surface side of the bowl portion 411 is larger than a dimension in an inward-outward direction of the bowl portion 413 on both right and left surface sides of the bowl portion 411.

According to this configuration, the width of the flush toilet 410 can be maintained, the radius of curvature ρ 1 on the front surface side of the bowl portion 411 can be increased, and the radius of curvature ρ 3 on both the right and left surfaces can be decreased, that is, the bowl portion 411 has a shape closer to a circle than in the related art, so that the washing water can smoothly swirl and a sufficient washing force can be obtained.

Then, the flush toilet 410 of embodiment 4 maintains the same external shape as the conventional flush toilet, and can use the same seat device as the conventional one without a dedicated seat device. Further, the washing water can be smoothly swirled, and thus washing can be performed in a wide range.

The bowl portion 411 includes a standing wall portion 416 that is substantially perpendicular to or depends inward in the inward-outward direction from the inner peripheral edge portion of the bowl portion 413. According to this configuration, since no portion recessed below the tub edge 413 is formed, dirt can be easily cleaned and seen.

< other embodiments >

The fourth invention is not limited to the embodiments described above and illustrated in the drawings, and for example, the following embodiments are also included in the technical scope of the present invention.

(1) In the above embodiment 4, the radius of curvature ρ 1 on the front surface side of the bidet portion 411 is slightly smaller than the radius of curvature ρ 2 on the rear surface side, but the present invention is not limited thereto, and for example, the radius of curvature on the front surface side of the bidet portion may be equal to the radius of curvature on the rear surface side.

5. A preferred embodiment of the fifth invention will be described.

In the toilet bowl according to the fifth aspect of the present invention, the discharge port may be opened at a position intermediate in the vertical direction of the upper vertical inner wall surface.

According to this configuration, the swirling flow that makes a turn along the upper vertical inner wall surface flows at a position lower than the discharge port, but the washing water discharged from the discharge port covers the swirling flow that makes a turn from above, and therefore the washing water can be prevented from scattering upward.

In the flush toilet bowl according to the fifth aspect of the present invention, a frame surface may be formed on an inner surface of the toilet bowl so as to face upward along a lower end edge of the upper vertical inner wall surface, and a lowermost end of the opening region of the discharge port may be set at a position above the frame surface.

According to this configuration, since the washing water discharged from the discharge port covers the washing water whirling on the rack surface from above, the washing water on the rack surface can be prevented from scattering upward.

In the flush toilet bowl according to the fifth aspect of the present invention, the upper vertical inner wall surface may have a shape in which a radius of curvature of a front end portion and a rear end portion is smaller than a radius of curvature of both left and right side edge portions in a plan view, and the discharge port may be opened to the front end portion or the rear end portion of the upper vertical inner wall surface.

According to this configuration, since the washing water discharged obliquely from the discharge port is in contact with the side edge portion having a large radius of curvature in a tangential manner after discharge, a decrease in water potential is suppressed, and a swirling flow having a high washing force is generated.

In the flush toilet bowl according to the fifth aspect of the present invention, a water storage portion connected to a drainage channel may be disposed rearward of a center of the toilet bowl in the front-rear direction, the discharge port may be disposed rearward of a water storage surface of the water storage portion, and a downward flow guide may be generated from a part of the washing water discharged from the discharge port.

According to this configuration, since a part of the washing water discharged from the discharge port serves as a downward guide flow toward the water storage unit, the dirt can be effectively guided to the drainage channel.

< example 5 >

Hereinafter, embodiment 5 embodying the fifth invention will be described with reference to fig. 25 to 28. In the following description, the lower side in fig. 25 and the right side in fig. 26 and 27 are defined as the front side with respect to the front-rear direction. The directions indicated in fig. 25 and 28 are directly defined as the left and right directions. The flush toilet bowl of embodiment 5 includes a toilet bowl 510, a water storage portion 517, a water discharge passage 519, and a water supply portion 524.

< bedpan 510 >

The bedpan 510 is formed in a substantially mortar shape that is open upward. In the bedpan 510, a rim 511 is formed along an upper end edge portion thereof. The upper end surface 511S of the pot rim 511 is substantially horizontal throughout the entire circumference and is continuous at a certain height throughout the entire circumference. The inner surface of bowl 510 serves as bowl surface 512 for blocking dirt (not shown). The upper end region of the bowl surface 512 is an upper vertical inner wall surface 513 continuous over the entire circumference. As shown in fig. 26 to 28, the upper vertical inner wall surface 513 is connected to the upper end surface 511S of the bowl side 511 at a right angle via an arcuate convex surface 514 having a small radius of curvature. The upper end surface 511S and the upper vertical inner wall surface 513 are smoothly (tangential) connected to the arcuate convex surface 514.

As shown in fig. 26 to 28, in a cross section along a vertical plane passing through the center portion of the toilet bowl 510 in a plan view, the upper end side region of the upper vertical inner wall surface 513 is substantially linear, and the arc-shaped convex surface 514 is constituted by only convex surfaces. The upper vertical inner wall surface 513 is connected to the upper end surface 511S at right angles via the arc-shaped convex surface 514 continuously over the entire circumference of the toilet bowl 510 (the bowl rim 511). Therefore, no outward projection, protrusion, or recess is formed in the upper vertical inner wall surface 513 so as to project into the toilet bowl 510 over the entire area thereof. Thus, even when the upper vertical inner wall surface 513 is viewed from a line of sight obliquely downward from a position higher than the upper end surface 511S of the bowl rim 511, the entire area of the upper vertical inner wall surface 513 can be visually observed.

The upper vertical inner wall surface 513 is perpendicular to the substantially horizontal upper end surface 511S of the bowl rim 511, and the "perpendicular angle" in the present embodiment is not limited to an exact angle of 90 °, but includes an angle slightly smaller than 90 ° and an angle slightly larger than 90 °. Therefore, the orientation of the upper vertical inner wall surface 513 is not limited to the precise vertical direction (vertical direction), and includes an orientation in which the upper end side is inclined to the vertical direction so as to slightly tilt toward the inside of the bedpan 510 (in other words, an orientation making an acute angle with the upper end surface 511S of the pot edge 511), and an orientation in which the upper end side is slightly inclined to the vertical direction toward the outside of the bedpan 510 (in other words, an orientation making an obtuse angle with the upper end surface 511S of the pot edge 511).

The region of the bowl surface 512 below the upper vertical inner wall surface 513 is a continuous shelf surface 515 over the entire circumference. The lower end of the frame surface 515 with respect to the upper vertical inner wall surface 513 is smoothly continuous via an arc-shaped concave surface 516. The frame surface 515 faces upward over the entire circumference, and is inclined so as to be lower as it is farther from the upper vertical inner wall surface 513. The inclination angle of the shelf surface 515 with respect to the horizontal plane is not constant in the circumferential direction but differs depending on the location, but is set to an angle smaller than 45 ° over the entire circumference.

< water storage part 517 and water drainage channel 519 >

The lower end of the bedpan 510 becomes a water reservoir 517. The water reservoir 517 is disposed in the center of the toilet bowl 510 in the lateral direction (width direction). The water storage unit 517 is disposed rearward of the center of the toilet bowl 510 in the front-rear direction. The inner surface of the upper end of the water reservoir 517 is constituted by a vertical wall 518 that is almost vertical over the entire circumference. The upper end of the upright wall 518 is smoothly continuous with the inner peripheral edge of the frame surface 515.

As shown in fig. 26, the drain passage 519 includes an ascending passage 520 connected to the water reservoir 517 and a descending passage 521 connected to a downstream end (upper end) of the ascending passage 520. The descending path 521 is connected to a drain pipe (not shown) provided on the floor of the toilet. The water storage portion 517 is located at an inlet of the drainage channel. The water drainage paths 519 are arranged symmetrically in the left-right direction (width direction) of the toilet bowl 510.

Before cleaning, the cleaning water is accumulated as accumulated water in the water accumulating portion 517 and the ascending path 520. The liquid surface when the water storage in the water storage portion 517 is stationary is defined as a water storage surface 523. The dirt caught by the bowl surface 512 and the dirt settled in the water storage unit 517 are discharged together with the washing water whirling or flowing down along the bowl surface 512 through the water discharge path 519.

< Water supply portion 524 >

Water supply unit 524 supplies washing water to toilet bowl 510, and is formed adjacent to the rear of the upper surface portion of toilet bowl 510. The center in the lateral direction of the front end of the water supply portion 524 is connected to the rear end of the bowl 511, and the upper surface of the water supply portion 524 is continuous in the same plane as the upper end surface 511S of the bowl 511. As shown in fig. 26 and 27, the water supply portion 524 includes: a rear water supply space 525 formed to have an opened upper surface and communicating with a water supply port (not shown) of a washing tank or the like; and a front water supply space 526 located in front of the rear water supply space 525 and communicating with the rear water supply space 525 via a communication hole 527.

< discharge port 528 >

A discharge port 528 for discharging the washing water supplied to the water supply unit 524 into the bowl 510 is formed at the upper end portion (the rim 511) of the bowl 510. The discharge port 528 is formed to penetrate a partition 529 that partitions the upper vertical inner wall surface 513 and the front water supply space 526. In other words, the discharge port 528 is located at the rear end of the upper vertical inner wall surface 513 and opens forward.

As shown in fig. 28, the opening shape (front view shape) of the discharge port 528 is a horizontally long square as a whole, and four corners are formed in an arc shape, and are asymmetric in vertical and lateral directions. Of the four edges constituting the opening edge of the discharge port 528, an upper edge 530 extends in the horizontal direction. The right edge 531 extends in the vertical direction. The left rim 532 is arc-shaped. The lower rim 533 is not horizontal and is slightly inclined in such a way as to be gradually higher to the left. In other words, the lower edge 533 of the discharge port 528 is inclined to descend from the left side of the bowl 510 toward the center. Thus, the height dimension of the discharge port 528 gradually decreases from the right side toward the left side.

As shown in fig. 25, the discharge port 528 is opened in a region rearward of the rear end of the water storage surface 523 of the water storage portion 517 over the entire range in the front-rear direction. The entire outlet 528 is open in a region to the left of the center of the toilet bowl 510 in the horizontal direction. Most of the region of the discharge port 528 excluding the left end portion is open so as to overlap the water storage surface 523 in the left-right direction. As shown in fig. 28, the uppermost end (upper edge 530) of the opening region of the discharge port 528 is set lower than the upper end (lower end of the arcuate convex surface 514) of the upper vertical inner wall surface 513. The lowermost end of the opening region of the discharge port 528 (the right end of the lower edge 533) is set at a position above the shelf surface 515.

Washing water is discharged into bowl 510 through discharge port 528. The discharge direction of the washing water from the discharge port 528 is a direction along the upper vertical inner wall surface 513, and is a counterclockwise direction in a plan view. The discharge flow rate of the washing water (the amount of water discharged per unit time) is almost maximum at the start of discharge, and then gradually decreases to be minimum immediately after completion of discharge. Therefore, the discharged washing water becomes swirling flow 534 in contact with the lower end portion of upper vertical inner wall surface 513 and frame surface 515 during a period from the start of discharge to the point when discharge is completed. The swirling flow 534 flows along the lower end portion of the upper vertical inner wall surface 513, and therefore does not scatter upward of the toilet bowl 510 (the rim 511). The swirling path of the swirling flow 534 gradually moves downward by gravity and flows into the water reservoir 517.

Then, immediately after the completion of the discharge, the discharged washing water becomes a guide flow 535 directed almost vertically downward toward the water storage unit 517. The downward guide flow 535 immediately after completion of discharge flows downward so as to cover the swirling flow 534 at the rear end portion of the shelf surface 515 from above. Thus, at the rear end of the shelf surface 515, the swirling flow 534 is directed downward by the guide flow 535 to flow into the water reservoir 517. The water storage portion 517 communicates with the inlet of the drain passage 519, and therefore, the washing water and the filth in the toilet bowl 510 are reliably discharged.

The flush toilet bowl of example 5 has: a bedpan 510; and an upper vertical inner wall surface 513 formed at the upper end portion of the inner surface of the toilet bowl 510 and connected to the inner peripheral edge of the substantially horizontal upper end surface 511S of the toilet bowl 510 at a right angle over the entire circumference of the toilet bowl 510. A discharge port 528 for discharging the washing water to generate a swirling flow 534 in contact with the upper vertical inner wall surface 513 is opened to the upper vertical inner wall surface 513. Since the upper vertical inner wall surface 513 having the opening of the discharge port 528 is connected to the horizontal upper end surface 511S of the toilet bowl 510 at right angles over the entire circumference without an outward projection, the entire area of the upper vertical inner wall surface 513 can be visually observed over the entire circumference even when viewed from a viewpoint higher than the upper end surface 511S of the toilet bowl 511.

The discharge port 528 opens to the upper vertical inner wall surface 513 at a position intermediate in the vertical direction. According to this configuration, the swirling flow 534 circulating along the upper vertical inner wall surface 513 in one circle flows at a position lower than the discharge port 528, but the washing water discharged from the discharge port 528 covers the swirling flow 534 circulating in one circle from above, and therefore the washing water can be prevented from scattering upward.

Further, on the inner surface of toilet bowl 510, a frame surface 515 facing upward along the lower end edge of upper vertical inner wall surface 513 is formed continuously over the entire circumference, and the lowermost end of the opening region of discharge port 528 is set at a position above frame surface 515. According to this configuration, since the wash water discharged from the discharge port 528 covers the wash water whirling on the rack surface 515 from above, the wash water on the rack surface 515 can be prevented from scattering upward.

The upper vertical inner wall surface 513 has a shape in which the radius of curvature of the front end portion and the rear end portion is smaller than the radius of curvature of the left and right side edge portions in a plan view. That is, the major axis of the oval is oriented in the front-rear direction. Then, the discharge port 528 opens to the rear end portion (in other words, a region having a small radius of curvature) of the upper vertical inner wall surface 513. According to this configuration, the washing water discharged obliquely forward from the discharge port 528 is in tangential contact with the side edge portion having a large radius of curvature after discharge, and therefore, a decrease in the water potential of the washing water is suppressed. Thus, a swirling flow 534 with a high cleaning force is generated.

Further, a water storage section 517 connected to the water discharge passage 519 is disposed rearward of the center in the front-rear direction in the toilet bowl 510, and the discharge port 528 is formed so as to be disposed rearward of the water storage surface 523 of the water storage section 517, and a part of the washing water discharged from the discharge port 528 generates a downward guide flow 555. According to this configuration, since a part of the washing water discharged from the discharge port 528 serves as the downward guide flow 535 toward the water storage unit 517, the dirt can be effectively guided to the drain path 519.

< other embodiments >

The fifth invention is not limited to the embodiments described above and illustrated in the drawings, and for example, the following embodiments are also included in the technical scope of the present invention.

(1) In the above-described embodiment 5, the discharge port is disposed at the rear end of the toilet bowl (the rim), but the discharge port may be disposed forward of the rear end of the toilet bowl.

(2) In embodiment 5, the number of discharge ports is set to only one, but a plurality of discharge ports may be arranged at different positions. In this case, the discharge port from the second side may not be the discharge port that generates the swirling flow. For example, the discharge port may be a discharge port that discharges water only downward.

(3) In example 5, the lowermost end of the opening region of the discharge port is set at a position above the shelf surface, but the lowermost end of the opening region of the discharge port may be set at the same height as the shelf surface.

(4) In example 5 described above, the entire discharge port is opened to the left of the center in the horizontal direction of the toilet bowl, but the entire discharge port may be opened to the right of the center in the horizontal direction of the toilet bowl, and the discharge port may be opened so as to cross the horizontal center line of the toilet bowl.

(5) In the above-described embodiment 5, the entire discharge port is opened to the region rearward of the rear end of the water storage surface of the water storage portion, but the entire discharge port may be opened to the region forward of the front end of the water storage surface of the water storage portion, and a part of the opening region of the discharge port may be in a positional relationship overlapping with the water storage surface in the front-rear direction.

(6) In example 5, the opening shape of the discharge port as viewed from the front is asymmetric in the left-right direction, but the opening shape of the discharge port as viewed from the front may be symmetric in the left-right direction.

Description of the reference numerals

110. A bedpan; 111. carrying out basin edge; 111S, the upper end surface of the basin edge; 115. an upper inner wall surface; 115F, the front region of the upper inner wall surface; 115R, the rear region of the upper inner wall surface; 115S, a side region of the upper inner wall surface; 117. a connecting surface; 117F, front area of the connection surface; 117H, the highest point of the connecting surface; 117R, rear region of the connecting surface; 117S, side regions of the connection surface; 118. a frame surface; 127. an outlet port; 129. swirling flow; 210. a bedpan; 211. carrying out basin edge; 212. a peripheral wall; 213. a first standing wall portion (upper end portion of the toilet bowl); 218. an outlet port; 220. a hollow portion; 250. an upper surface portion; 255. a water supply space; 270. a shielding portion; 310. a bedpan; 313. a first standing wall portion (standing wall portion); 314. an intermediate wall portion; 323. a connecting portion; 323A, curved surface; 324. a front side region; 325. the midpoint of the arc; 410. flushing a toilet bowl; 411. a toilet bowl portion; 412. a peripheral wall portion; 413. a basin edge part; 416. a standing wall portion; 426. a rim side surface portion (a rim portion on both right and left sides of the toilet bowl portion); 428. a bowl side front surface portion (bowl side portion on the front surface side of the bowl portion); 510. a bedpan; 511. carrying out basin edge; 511S, the upper end surface of the basin edge; 513. an upper vertical inner wall surface; 515. a frame surface; 517. a water storage part; 519. a water drainage path; 523. a water storage surface; 528. an outlet port; 534. swirling flow; 535. guiding the flow.

Industrial applicability of the invention

The invention relates to a closestool.

Claims (6)

1. A water flushing closestool basin, which is characterized in that,

the method comprises the following steps:

a bedpan;

a basin side formed at an upper end edge portion of the toilet bowl;

an upper inner wall surface formed on the inner surface of the toilet bowl so as to be continuous with the inner peripheral edge of the upper end surface of the rim, the upper inner wall surface having a larger curvature in a front region and a rear region than in right and left regions in a plan view;

a shelf surface formed to protrude inward along a lower end edge of the upper inner wall surface and to face upward;

a connecting surface for connecting the lower end edge of the upper inner wall surface and the outer peripheral edge of the frame surface; and

a discharge port for discharging the washing water so as to generate a swirling flow in contact with the upper inner wall surface, the rack surface, and the connecting surface,

the front region and the rear region of the connecting surface are set at positions lower than the regions on both the left and right sides of the connecting surface.

2. The toilet bowl of claim 1,

a convolute path from the front region to the rear region of the connecting surface is smoothly continuous with a gradually changing height.

3. The toilet bowl according to claim 1 or 2,

the height of the connecting surface is in the following form: the central portion of the perimeter of the side region, which has the smallest curvature in plan view, has a highest point, and is continuously inclined downward from the highest point toward the front region and the rear region.

4. The toilet bowl according to claim 1 or 2,

the discharging direction of the washing water in the discharging port is any one of the front direction and the rear direction,

the height of an end region of the connecting surface, which is located on a side where the wash water discharged from the discharge port first reaches, is set to be lower than that of the other end region, of the front region and the rear region.

5. The toilet bowl according to claim 1 or 2,

the upper inner wall surface, the shelf surface, and the connecting surface are bilaterally symmetrical.

6. The toilet bowl according to claim 1 or 2,

the upper inner wall surface is a straight surface or a surface having an upper end inclined toward the outside of the toilet bowl.

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