FLUSH TOILET

Abstract

The present invention provides a siphon jet flush toilet, in which flush water is discharged from a rim spout port and a jet spout port at different timings, including a bowl including a waste receiving surface, a rim, a shelf surface, and a basin; a rim spout port provided in the rim, and spouting flush water along an inner peripheral surface of the rim; and a jet spout port provided in a bottom portion of the bowl, and spouting flush water toward an inlet of a discharge trap conduit, and the flush toilet is formed so that a curvature radius of a front end of the basin is smaller than a curvature radius of the inner peripheral surface of the rim in a front end of the bowl in planar view.

Claims

1. A siphon jet flush toilet, in which flush water is discharged from a rim spout port and a jet spout port at different timings, comprising: a bowl including a bowl-shaped waste receiving surface, a rim formed at a top portion of the waste receiving surface, a shelf surface formed between the waste receiving surface and the rim, and a basin formed below the waste receiving surface and having a reservoir surface formed inside; a discharge trap conduit having an inlet connected to a bottom portion of the bowl to discharge waste; a rim spout port provided in the rim, and spouting flush water along an inner peripheral surface of the rim; and a jet spout port provided in the bottom portion of the bowl, and spouting flush water toward the inlet of the discharge trap conduit, the flush toilet being formed so that a curvature radius of a front end of the basin is smaller than a curvature radius of the inner peripheral surface of the rim in a front end of the bowl in planar view.

2. The flush toilet according to claim 1, wherein after flush water is discharged from the rim spout port, flush water is discharged from the jet spout port.

3. The flush toilet according to claim 2, wherein after the flush water discharged from the rim spout port flows into the reservoir surface, flush water is discharged from the jet spout port.

4. The flush toilet according to claim 1, wherein while flush water is discharged from the jet spout port, flush water is continuously discharged from the rim spout port.

5. The flush toilet according to claim 1, wherein the waste receiving surface is formed so that an inclination angle at which the waste receiving surface is inclined down toward the center of the bowl is minimized in a front region.

6. The flush toilet according to claim 1, which is formed so that in the front end of the bowl, the curvature radius of the inner peripheral surface of the rim is larger than a curvature radius of an outer shell of the toilet main body in planar view.

7. The flush toilet according to claim 6, wherein the inner peripheral surface of the rim, in planar view, is formed with a minimum curvature radius in the front end of the bowl and formed with a curvature radius larger than the minimum curvature radius behind the front end of the bowl.

8. The flush toilet according to claim 6, wherein in the front end of the bowl, the inner peripheral surface of the rim is formed so that a curvature radius of a lower end of the inner peripheral surface in planar view is larger than the curvature radius of the outer shell of the toilet main body and is formed so that a curvature radius above the lower end is about the same size as the curvature radius of the outer shell of the toilet main body.

9. The flush toilet according to claim 8, wherein the bowl includes the shelf surface formed between the waste receiving surface and the rim and through which the flush water discharged from the rim spout port swirls, and is formed so that a curvature radius of a front end of the waste receiving surface is larger than the curvature radius of the inner peripheral surface of the rim in the front end of the bowl in planar view.

10. The flush toilet according to claim 1, wherein the rim spout port is disposed behind a position at which a width of the waste receiving surface in a left-right direction is maximized in planar view.

11. The flush toilet according to claim 10, wherein the waste receiving surface is formed in a concave shape recessed downward in a front region of the waste receiving surface.

12. The flush toilet according to claim 11, wherein the waste receiving surface is formed in a convex shape that protrudes upward in a region behind the rim spout port.

13. The flush toilet according to claim 11, wherein the waste receiving surface is formed in a convex shape that protrudes upward in a region behind the front region.

14. The flush toilet according to claim 10, wherein the rim is formed so that the inner peripheral surface of the rim overhangs inward as being upward, and is formed so that an amount of overhang of the inner peripheral surface of the rim is maximized in the front end of the bowl.

15. The flush toilet according to claim 10, wherein the rim is formed so that the inner peripheral surface of the rim is inclined inward as being upward, and is formed so that an inclination angle at which the inner peripheral surface of the rim is inclined inward relative to a vertical direction is maximized in the front end of the bowl.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0036] FIG. 1 shows a top cross-sectional view illustrating a flush toilet according to an embodiment of the present invention;

[0037] FIG. 2 shows a side cross-sectional view seen along the II-II line of FIG. 1;

[0038] FIG. 3 shows a plan view in a state where an upper part of a rim is removed from a body of the flush toilet according to an embodiment of the present invention;

[0039] FIG. 4 shows a perspective view in a state where the rim upper part is removed from the body of the flush toilet according to the embodiment of the present invention;

[0040] FIG. 5A shows a cross-sectional view seen along the VA-VA line of FIG. 1;

[0041] FIG. 5B shows a cross-sectional view seen along the VB-VB line of FIG. 1;

[0042] FIG. 5C shows a cross-sectional view seen along the VC-VC line of FIG. 1;

[0043] FIG. 6A shows a cross-sectional view seen along the VIA-VIA line of FIG. 1;

[0044] FIG. 6B shows a cross-sectional view seen along the VIB-VIB line of FIG. 1;

[0045] FIG. 7A shows explanatory views illustrating a flushing operation of the flush toilet according to the embodiment of the present invention;

[0046] FIG. 7B shows explanatory views illustrating a flushing operation of the flush toilet according to the embodiment of the present invention;

[0047] FIG. 7C shows explanatory views illustrating a flushing operation of the flush toilet according to the embodiment of the present invention;

[0048] FIG. 7D shows explanatory views illustrating a flushing operation of the flush toilet according to the embodiment of the present invention;

[0049] FIG. 7E shows explanatory views illustrating a flushing operation of the flush toilet according to the embodiment of the present invention;

[0050] FIG. 7F shows explanatory views illustrating a flushing operation of the flush toilet according to the embodiment of the present invention; and

[0051] FIG. 8 shows a view illustrating that a bowl is flushed in the flush toilet according to the embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

[0052] Hereinafter, a flush toilet according to an embodiment of the present invention will be described with reference to the drawings.

[0053] First, with reference to FIGS. 1 and 2, a basic structure of a flush toilet 1 according to the embodiment of the present invention will be described. FIG. 1 is a top cross-sectional view illustrating the flush toilet according to the embodiment of the present invention, and FIG. 2 is a side cross-sectional view seen along the II-II line of FIG. 1.

[0054] In addition, in the description, as seen from a user, a user's side of the flush toilet is described as a front side, a back side is described as a rear side, a right side is described as the right side, and a left side is described as the left side.

[0055] As shown in FIGS. 1 and 2, the flush toilet 1 according to the embodiment of the present invention is a siphon jet flush toilet that generates a siphon action by jet spouting and discharges waste inside a bowl through a discharge trap conduit to outside.

[0056] In addition, the flush toilet 1 according to the embodiment of the present invention is the siphon jet flush toilet, and may be a wash-down toilet that pushes and flushes away waste by a flowing water action due to a head of water in the bowl, or a siphon flush toilet that generates the siphon action by rim spouting and discharges waste inside the bowl trough a discharge conduit to the outside.

[0057] The flush toilet 1 includes a ceramic toilet main body 2, a resin toilet seat and a toilet lid (not shown) arranged on an upper surface of the toilet main body 2, and a storage tank 4 disposed in a rear upper part of the toilet main body 2 and covered with a resin cover (not shown).

[0058] The toilet main body 2 includes a bowl 6 formed to receive waste, a discharge trap conduit 8 formed in a bottom portion of the bowl 6 for discharging waste by the siphon action, a rim spout port 10 formed for rim spouting, a rim conduit 12 formed to supply flush water to the rim spout port 10, a jet spout port 14 formed for jet spouting, and a jet water conduit 16 formed to supply flush water to the jet spout port 14.

[0059] The bowl 6 includes a bowl-shaped waste receiving surface 18, a rim 20 formed along a top edge of the bowl 6, and a shelf surface 21 formed between the waste receiving surface 18 and the rim 20. Furthermore, the bowl 6 includes a basin 22 formed in a region below the waste receiving surface 18 and connected to the discharge trap conduit 8. Inside the basin 22, a reservoir surface W is formed.

[0060] The discharge trap conduit 8 includes an inlet 8a, an ascending conduit 8b extending upward from the inlet 8a, a descending conduit 8c extending downward from the ascending conduit 8b, and a top portion 8d located between the descending conduit 8c and the ascending conduit 8b to define a reserved water level. A lower end of the descending conduit 8c of the discharge trap conduit 8 is connected to a discharge pipe (not shown) via a discharge socket (not shown).

[0061] Only one rim spout port 10 (spout port) is formed on the left side behind the rim 20 as seen from the front of the toilet main body 2. The rim spout port 10 spouts flush water toward the front, and the flush water flows down to the waste receiving surface 18 while swirling on an inner peripheral surface 20a of the rim 20 and the shelf surface 21, to flush the waste receiving surface 18.

[0062] The rim conduit 12 is formed in a tapered shape in which a cross section of a flow channel is gradually reduced toward the rim spout port 10 in planar view. Upstream of the rim conduit 12, a water supply hose 13 directly coupled to a water supply is coupled. Flush water is supplied from the water supply to the rim conduit 12, and flush water is discharged from the rim spout port 10 by a water supply pressure of the water supply.

[0063] The jet spout port 14 is formed in a bottom portion of the bowl 6. The jet spout port 14 is disposed opposite to the inlet 8a of the discharge trap conduit 8 and directed toward the inlet 8a of the discharge trap conduit 8. The jet spout port 14 spouts flush water toward the inlet 8a of the discharge trap conduit 8, and the flush water flows into the discharge trap conduit 8 to activate the siphon action.

[0064] The jet water conduit 16 extends forward from the storage tank 4, bends, and then extends rearward. The jet water conduit 16 has one end connected to a drain port 4a of the storage tank 4, and the other end connected to the jet spout port 14. Flush water is supplied to the jet water conduit 16 from the storage tank 4, and flush water is discharged from the jet spout port 14 due to a head pressure of the flush water.

[0065] The storage tank 4 is a gravity water supply tank that stores flush water for use in jet spouting and supplies the flush water to the jet spout port 14. The storage tank 4 is a small-sized resin tank. The storage tank 4 has a volume of about three liters, and a water amount of flush water discharged from the storage tank 4 in one flushing time is about two liters.

[0066] Inside the storage tank 4, a water supply device 24 that supplies flush water to the storage tank 4, a discharge device 26 that supplies or stops the flush water stored in the storage tank 4 to the jet water conduit 16, and a float switch 28 that detects a state where a water level of flush water in the storage tank 4 reaches a full water level are provided. Furthermore, outside the storage tank 4, a controller (not shown) that controls the water supply device 24 and the discharge device 26 to drive or stop based on user's operation signal, and an operation part (not shown) that transmits an operation signal in response to user's operation are provided.

[0067] The water supply device 24 includes a fixed flow valve (not shown) coupled to the water supply, a rim solenoid valve 23 that supplies or stops flush water to the rim spout port 10, and a tank solenoid valve 27 that supplies or stops flush water to a tank water supply port 25 disposed in the storage tank 4. The rim solenoid valve 23 and the tank solenoid valve 27 are driven by a controller command based on the user's operation signal or a water level detection signal by the float switch 28.

[0068] The discharge device 26 includes an overflow pipe 30 for draining water overflown from the storage tank 4 to the toilet main body 2, a discharge valve 32 fixed to a lower end of the overflow pipe 30, and a toilet flushing unit 36 that vertically moves the overflow pipe 30 by an electric driving force to open and close the discharge valve 32. The toilet flushing unit 36 is driven by a controller command based on the user's operation signal.

[0069] The controller is electrically connected to the operation part, the float switch 28, the rim solenoid valve 23, the tank solenoid valve 27, and the toilet flushing unit 36, and can transmit and receive various signals. The controller receives a flushing start signal for large or small flushing from the operation part and drives or stops the rim solenoid valve 23, the tank solenoid valve 27, and the toilet flushing unit 36 based on a flushing sequence stored in advance.

[0070] In the flush toilet 1 according to the embodiment of the present invention, an amount of flush water is set to about 4.8 liters for large flushing and about 3.8 liters for small flushing.

[0071] Next, with reference to FIGS. 2 to 6, a structure of the bowl 6 of the flush toilet 1 according to the embodiment of the present invention will be described in detail.

[0072] FIG. 3 is a plan view in a state where an upper part of the rim is removed from a body of the flush toilet according to the embodiment of the present invention; FIG. 4 is a perspective view in a state where the rim upper part is removed from the body of the flush toilet according to the embodiment of the present invention; FIGS. 5A to 5C are cross-sectional views seen along the VA-VA line to the VC-VC line of FIG. 1; and FIGS. 6A and 6B are cross-sectional views seen along the VIA-VIA line and the VIB-VIB line of FIG. 1. FIGS. 5A to 5C are cross-sectional views in a line radially extended from the center O of the bowl 6.

[0073] First, as shown in FIG. 2, the inner peripheral surface 20a of the rim 20 has a lower end 20b coupled to the shelf surface 21. Furthermore, in the inner peripheral surface 20a of the rim 20, a bonding portion 20c is provided to which a rim upper part 40 and a body 42 that are molded separately during toilet manufacturing are bonded. The bonding portion 20c is disposed near the center of the rim 20 in an up-down direction in a front end 6a of the bowl 6 (see FIG. 2). The inner peripheral surface 20a of the rim 20 extends up toward outside the bowl 6 from the lower end 20b to the bonding portion 20c and extends up toward inside the bowl 6 from the bonding portion 20c to an upper end 20d.

[0074] Next, as shown in FIG. 3, an outer shell 7 of the toilet main body 2 is formed so that in the front end 6a of the bowl 6, a curvature radius R1 in planar view is smaller than a curvature radius of the outer shell 7 of the toilet main body 2 on a rear side. The curvature radius R1 in a front end of the outer shell 7 of the toilet main body 2 is a minimum curvature radius in the outer shell 7 of the toilet main body 2. Consequently, the flush toilet 1 constitutes an appearance design that the front end is pointed in the outer shell 7 of the toilet main body 2.

[0075] As shown in FIGS. 3 and 4, the lower end 20b of the inner peripheral surface 20a of the rim 20 is formed with a minimum curvature radius R2 in the inner peripheral surface 20a of the rim 20 in the front end 6a of the bowl 6 in planar view (see a region S1 in FIG. 3). A left front portion 6b and a right front portion 6c behind the front end 6a of the bowl 6 are formed with a curvature radius R3 (>R2) larger than the minimum curvature radius R2 (see regions S2 and S3 in FIG. 3). A left side portion 6d and a right side portion 6e further behind the left front portion 6b and the right front portion 6c of the bowl 6 are formed with a maximum curvature radius R4 (>R3) (see regions S4 and S5 in FIG. 3). Furthermore, the flush toilet is formed so that the curvature radiuses R2 to R4 of the lower end 20b of the rim 20 are larger than the curvature radius R1 of the front end of the outer shell 7 of the toilet main body 2 (R2 to R4>R1). Consequently, energy loss of the flush water flowing along the inner peripheral surface 20a of the rim 20 in the front end 6a of the bowl 6 can be reduced.

[0076] As shown in FIGS. 3 and 4, the bonding portion 20c to which the rim upper part 40 and the body 42 that are separately molded are bonded during the toilet manufacturing is provided above the lower end 20b of the inner peripheral surface 20a of the rim 20. The bonding portion 20c of the rim 20 is formed with a curvature radius R5 (<R2) smaller than the curvature radius R2 of the lower end 20b of the rim 20 in the front end 6a of the bowl 6 in planar view. The flush toilet is formed so that the curvature radius R5 of the bonding portion 20c of the rim 20 has about the same size as the curvature radius R1 of the front end of the outer shell 7 of the toilet main body 2 (R5=R1). Thus, the flush toilet is formed so that the curvature radius R2 of the lower end 20b of the rim 20 is larger than the curvature radius R1 of the front end of the outer shell 7 of the toilet main body 2, and energy loss is prevented from being generated in flush water swirling along the inner peripheral surface 20a of the rim 20 in the front end 6a of the bowl 6. The flush toilet is formed so that the curvature radius R5 of the bonding portion 20c of the rim 20 is about the same size as the curvature radius R1 of the front end of the outer shell 7 of the toilet main body 2. Therefore, the rim upper part 40 and the body 42 that are separately molded can be easily bonded during the manufacturing of the flush toilet 1, and the toilet main body 2 can be thus easily manufactured.

[0077] As shown in FIG. 3, the waste receiving surface 18 has a front end 18a formed with a curvature radius R6. The flush toilet is formed so that the curvature radius R6 of the front end 18a of the waste receiving surface 18 is larger than the curvature radius R2 of the lower end 20b of the rim 20 in the front end 6a of the bowl 6 (R6>R2). Consequently, the flush water swirling through the shelf surface 21 smoothly flows down to the waste receiving surface 18.

[0078] In the embodiment of the present invention, the flush toilet is formed so that the curvature radius R6 of the front end 18a of the waste receiving surface 18 is larger than the curvature radius R2 of the lower end 20b of the rim 20 in the front end 6a of the bowl 6. The flush toilet may be formed so that the curvature radius R6 has the same size as the curvature radius R2 of the lower end 20b of the rim 20.

[0079] As shown in FIG. 3, the basin 22 has a front end 22a formed with a curvature radius R7. The basin is formed so that the curvature radius R7 of the front end 22a of the basin 22 is smaller than the curvature radius R1 of the front end of the outer shell 7 of the toilet main body 2, the curvature radius R2 of the lower end 20b of the rim 20, and the curvature radius R6 of the front end 18a of the waste receiving surface 18 (R7<R1, R2, R6). Consequently, the flush water smoothly flows into the reservoir surface W.

[0080] As shown in FIG. 1, the rim spout port 10 is disposed behind a position X1 at which the waste receiving surface 18 of the bowl 6 has a maximized width in the left-right direction in planar view. Furthermore, the rim spout port 10 is disposed behind a position X2 at which the reservoir surface W has a maximized width in the left-right direction in planar view. Consequently, a distance from the rim spout port 10 to the front end 6a of the bowl 6 is relatively long.

[0081] Next, as shown in FIG. 2, the waste receiving surface 18 is formed in a concave shape recessed downward in a front region of the waste receiving surface. Although flush water is difficult to flow down under a large centrifugal force in the front region of the waste receiving surface, the concave shape of the waste receiving surface allows the flush water to flow down from the front region of the waste receiving surface.

[0082] As shown in FIGS. 5A to 5C, the waste receiving surface 18 is formed in a convex shape that protrudes upward in a region behind the front region of the waste receiving surface 18 (see FIGS. 5A to 5C). Consequently, the flush water passed through the inner peripheral surface 20a of the rim 20 in the front end 6a of the bowl 6 is put on the convex waste receiving surface 18 and distributed to the entire waste receiving surface 18.

[0083] As shown in FIGS. 5B and 5C, the waste receiving surface 18 is formed in a convex shape that protrudes upward in a region behind the rim spout port 10 (see FIGS. 5B and 5C). Consequently, in the rear region in which momentum of flush water weakens, the flush water is put on the convex waste receiving surface 18 and distributed to the region behind the rim spout port 10.

[0084] As shown in FIGS. 2 and 5A to 5C, the flush toilet is formed so that an inclination angle at which the waste receiving surface 18 is inclined down toward a center O of the bowl 6 (inclination angle at which the surface is inclined downward relative to a horizontal direction) is minimized in the front region of the waste receiving surface 18. In other words, the flush toilet is formed so that the inclination angle at which the waste receiving surface 18 is inclined down toward the center O of the bowl is larger in the rear region than in the front region of the waste receiving surface 18. Consequently, flush water smoothly flows from the front region of the waste receiving surface 18 to the reservoir surface W.

[0085] As shown in FIGS. 6A and 6B, the waste receiving surface 18 includes a concave portion 18b recessed downward in the front region of the waste receiving surface. The concave portion 18b extends in a straight line from the front end 6a of the bowl 6 to the rear reservoir surface W. Consequently, flush water swirling on the waste receiving surface 18 is collected by the concave portion 18b and flows toward the reservoir surface W.

[0086] As shown in FIGS. 2 and 5A to 5C, the flush toilet is formed so that an amount by which the inner peripheral surface 20a of the rim 20 overhangs inside the bowl 6 (amount of the upper end 20d of the rim 20 protrudes to the inside of the bowl 6 relative to the lower end 20b) is maximized in the front end 6a of the bowl 6. Consequently, in the front end 6a of the bowl 6, flush water easily splashing out from the toilet under a large centrifugal force can be prevented from splashing out.

[0087] As shown in FIGS. 2 and 5A to 5C, the flush toilet is formed so that an inclination angle at which the inner peripheral surface 20a of the rim 20 is inclined to the inside of the bowl 6 relative to a vertical direction is maximized in the front end 6a of the bowl 6. Consequently, in the front end 6a of the bowl 6, flush water easily splashing out from the toilet bowl under a large centrifugal force can be prevented from splashing out.

[0088] Next, with reference to FIGS. 7A to 7F, a flushing operation of the flush toilet 1 according to the embodiment of the present invention will be described.

[0089] FIGS. 7A to 7F shows views illustrating the flushing operation of the flush toilet according to the embodiment of the present invention.

[0090] FIG. 7A shows a standby state where the flush water is reserved to an initial water level of the reservoir surface W in the bowl 6, and flush water is also reserved at a position as high as the initial water level of the reservoir surface W in the jet water conduit 16. At this time, air stagnates in an area A upstream of the jet water conduit 16 located directly under the storage tank 4.

[0091] Next, as shown in FIG. 7B, the water supply device is driven (the rim solenoid valve is opened), and flush water is discharged from the rim spout port 10 (rim spouting starts). The flush water discharged from the rim spout port 10 swirls in the bowl 6 and flows into the reservoir surface W. The water level of the reservoir surface W gradually rises, and the water level of the flush water gradually rises also in the jet water conduit 16. Consequently, the air stagnated in the area A is discharged from the overflow pipe 30 to fill the jet water conduit 16 with water.

[0092] Thereafter, as shown in FIG. 7C, the discharge device 26 is driven (the discharge valve 32 is opened) in a state where flush water is discharged from the rim spout port 10, and flush water is discharged from the jet spout port 14 (jet spouting starts). Concurrently, the head pressure of the flush water stored in the storage tank 4 is applied to flush water stagnated in the jet water conduit 16, and the flush water is discharged at a first flow rate from the jet spout port 14. The first flow rate is a large flow rate, and the discharge trap conduit 8 is filled by jet spouting at the first flow rate to activate the siphon action. The jet spouting at the first flow rate is continuously performed for a predetermined time, and waste is discharged by a strong siphon action.

[0093] Next, as shown in FIG. 7D, the discharge device 26 stops (the discharge valve 32 closes) in a state where flush water is discharged from the rim spout port 10. Even if the discharge device 26 stops, a large volume of the entire jet water conduit 16 allows a large amount of flush water to stagnate in the jet water conduit 16, and flush water flows through the jet water conduit 16 under the head pressure of the stored flush water and is discharged at a second flow rate from the jet spout port 14. The second flow rate is smaller than the first flow rate but is sufficient to continue the siphon action. The jet spouting at the second flow rate is continuously performed for a predetermined time, and the siphon action is continued.

[0094] Thereafter, as shown in FIG. 7E, reserved water is discharged together with waste by the siphon action to lower the water level of the reservoir surface W, and air enters an upper end of the inlet 8a of the discharge trap conduit 8, to end the siphon action. Here, the jet water conduit 16 is formed so that flush water continues to stagnate. Therefore, entry of air is delayed, and the end of the siphon action can be delayed. When flush water is continuously discharged from the rim spout port 10, and flush water is reserved to the initial water level of the reservoir surface W in the bowl 6, the flushing ends. Currently, flush water is also reserved at a position as high as the reservoir surface W in the jet water conduit 16.

[0095] Next, as shown in FIG. 7F, the water supply device is driven (the tank solenoid valve is opened) and water supply to the tank is started. When the water level of the flush water in the storage tank 4 rises and the float switch detects a state of stopped water level (full water level), the water supply device stops (the tank solenoid valve e is closed), and then as shown in FIG. 7A, the initial state is achieved.

[0096] Next, with reference to FIG. 8, a state where the bowl 6 is flushed in the flush toilet 1 according to the embodiment of the present invention will be described.

[0097] FIG. 8 is a view illustrating that the bowl is flushed in the flush toilet according to the embodiment of the present invention.

[0098] As shown in FIG. 8, most of the flush water discharged from the rim spout port 10 swirls along the inner peripheral surface 20a of the rim 20 and the shelf surface 21 (F1). Since the curvature radius R2 of the inner peripheral surface 20a of the rim 20 is large in the front end 6a of the bowl 6, energy loss of flush water flowing along the inner peripheral surface 20a of the rim 20 is reduced.

[0099] A part of the flush water swirling through the shelf surface 21 flows down from the shelf surface 21 to the waste receiving surface 18 and swirls on the waste receiving surface 18. Since the waste receiving surface 18 has the convex shape that protrudes upward in the region behind the front region of the waste receiving surface 18, a part of the flush water swirling on the waste receiving surface 18 is guided to the rear region (F2). Furthermore, since the waste receiving surface 18 has the concave shape recessed downward in the front region of the waste receiving surface 18, a part of the flush water swirling on the waste receiving surface 18 is guided through the concave waste receiving surface 18 to the reservoir surface W (F3). The flush water guided to the reservoir surface W smoothly flows into the reservoir surface W because the curvature radius of the front end 22a of the basin 22 is reduced.

[0100] Hereinafter, operations and effects of the flush toilet 1 according to the above-described embodiment of the present invention will be described.

[0101] According to the embodiment of the present invention, since the flush toilet 1 is formed so that the curvature radius R7 of the front end 22a of the basin 22 is smaller than the curvature radius R2 of the inner peripheral surface 20a of the rim 20 in the front end 6a of the bowl 6 in planar view, the flush water discharged from the rim spout port 10 can smoothly flow into the reservoir surface W. Thus, the energy of the flush water can be effectively transmitted to the reservoir surface W, and the waste in reserved water can be moved. As a result, waste can be sufficiently discharged by jet spouting.

[0102] Furthermore, in the flush toilet 1 according to the embodiment of the present invention, after flush water is discharged from the rim spout port 10, flush water is discharged from the jet spout port 14. Consequently, flush water can be discharged from the jet spout port 14, after waste submerged in reserved water is moved by flush water discharged from the rim spout port 10. As a result, waste can be sufficiently discharged by jet spouting.

[0103] In the flush toilet 1 according to an embodiment of the present invention, after the flush water discharged from the rim spout port 10 flows into the reservoir surface W, flush water is discharged from the jet spout port 14. Consequently, flush water can be discharged from the jet spout port 14, after waste submerged in reserved water is moved by the flush water discharged from the rim spout port 10. As a result, waste can be sufficiently discharged by jet spouting.

[0104] Furthermore, in the flush toilet 1 according to the embodiment of the present invention, while flush water is discharged from the jet spout port 14, flush water is continuously discharged from the rim spout port 10. Consequently, flush water can be discharged from the jet spout port 14 while moving the waste submerged in reserved water. As a result, waste can be sufficiently discharged by jet spouting.

[0105] In the flush toilet 1 according to the embodiment of the present invention, the waste receiving surface 18 is formed so that the inclination angle at which the waste receiving surface is inclined down toward the center of the bowl 6 is minimized in the front region of the waste receiving surface 18, and therefore the flush water discharged from the rim spout port 10 can smoothly flow from the front region of the waste receiving surface 18 to the reservoir surface W.

[0106] Furthermore, according to the embodiment of the present invention, the flush toilet 1 is formed so that in the front end 6a of the bowl 6, the curvature radius R2 of the inner peripheral surface 20a of the rim 20 is larger than the curvature radius R1 of the outer shell 7 of the toilet main body 2 in planar view. Consequently, even if the outer shell 7 of the toilet main body 2 is formed with a small curvature radius R1, the flush water flowing along the inner peripheral surface 20a of the rim 20 in the front end 6a of the bowl 6 can be inhibited from undergoing energy loss. Therefore, the energy loss of the flush water flowing along the inner peripheral surface 20a of the rim 20 can be reduced, and the entire bowl 6 can be sufficiently flushed.

[0107] In the flush toilet 1 according to the embodiment of the present invention, since the inner peripheral surface 20a of the rim 20, in planar view, is formed with the minimum curvature radius R2 in the front end 6a of the bowl 6 and formed with the curvature radius R3 larger than the minimum curvature radius R2 behind the front end 6a of the bowl 6, energy loss of flush water flowing along the inner peripheral surface 20a of the rim 20 in the front end 6a of the bowl 6 can be reduced, and the entire bowl 6 can be sufficiently flushed.

[0108] Furthermore, in the flush toilet 1 according to the embodiment of the present invention, since in the front end 6a of the bowl 6, the inner peripheral surface 20a of the rim 20 is formed so that the curvature radius of the lower end 20b of the inner peripheral surface is larger than the curvature radius of the outer shell 7 of the toilet main body 2, the energy loss of the flush water flowing through the front end 6a of the bowl 6 can be reduced. Furthermore, since the inner peripheral surface 20a of the rim 20 is formed so that the curvature radius R5 above the lower end 20b is about the same size as the curvature radius R1 of the outer shell 7 of the toilet main body 2, the toilet main body 2 can be easily manufactured.

[0109] In the flush toilet 1 according to the embodiment of the present invention, the bowl 6 includes the shelf surface 21 formed between the waste receiving surface 18 and the rim 20 and through which the flush water discharged from the rim spout port 10 swirls, and is formed so that the curvature radius R6 of the front end 18a of the waste receiving surface 18 is larger than the curvature radius R2 of the inner peripheral surface 20a of the rim 20 in the front end 6a of the bowl 6 in planar view. Consequently, the flush water swirling through the shelf surface 21 can smoothly flow down to the waste receiving surface 18.

[0110] Furthermore, in the flush toilet 1 according to the embodiment of the present invention, the rim spout port 10 is constructed so that flush water is discharged forward. Therefore, even in the flush toilet 1 in which flush water is discharged forward from the rim spout port 10, energy loss of flush water flowing along the inner peripheral surface 20a of the rim 20 in the front end 6a of the bowl 6 can be reduced.

[0111] In the flush toilet 1 according to the embodiment of the present invention, since the rim spout port 10 is disposed behind the position X1 at which the width of the waste receiving surface 18 in the left-right direction is maximized in planar view, a distance from the rim spout port 10 to the front end 6a of the bowl 6 can be increased. Consequently, many regions can be flushed with flush water in a high energy state before the flush water undergoes energy loss in the front end 6a of the bowl 6. Therefore, in the flush toilet 1 in which toilet is flushed with flush water supplied by a water supply pressure of the water supply, a flushing performance of the bowl 6 can be improved.

[0112] Furthermore, in the flush toilet 1 according to the embodiment of the present invention, the waste receiving surface 18 is formed in the concave shape recessed downward in the front region of the waste receiving surface. Consequently, flush water can flow down from the front region of the waste receiving surface 18.

[0113] In the flush toilet 1 according to the embodiment of the present invention, the waste receiving surface 18 is formed in the convex shape that protrudes upward in the region behind the rim spout port 10. Consequently, in a rear region in which momentum of flush water weakens, the flush water can be put on the convex waste receiving surface 18 and distributed to the rear region.

[0114] Furthermore, in the flush toilet 1 according to the embodiment of the present invention, the waste receiving surface 18 is formed in the convex shape that protrudes upward in the region behind the front region. Consequently, flush water can be put on the convex waste receiving surface 18 and distributed to the entire waste receiving surface 18.

[0115] In the flush toilet 1 according to the embodiment of the present invention, the rim 20 is formed so that the inner peripheral surface 20a of the rim overhangs inward as being upward and is formed so that the amount of overhang of the inner peripheral surface 20a of the rim 20 is maximized in the front end 6a of the bowl 6. Therefore, flush water can be prevented from splashing out from the front end 6a of the bowl 6.

[0116] Furthermore, in the flush toilet 1 according to the embodiment of the present invention, the rim 20 is formed so that the inner peripheral surface 20a of the rim is inclined inward as being upward and is formed so that the inclination angle at which the inner peripheral surface 20a of the rim 20 is inclined inward relative to the vertical direction is maximized in the front end 6a of the bowl 6. Therefore, flush water can be prevented from splashing out from the front end 6a of the bowl 6.

[0117] Without limiting the above-described embodiment of the present invention, various changes and modifications are possible within the scope of the technical concept described in the claims.

REFERENCE SIGNS LIST

[0118] 1: flush toilet [0119] 2: toilet main body [0120] 4: storage tank [0121] 6: bowl [0122] 6a: front end of the bowl [0123] 6b: left front portion of the bowl [0124] 6c: right front portion of the bowl [0125] 6d: left side portion of the bowl [0126] 6e: right side portion of the bowl [0127] 7: outer shell of the toilet main body [0128] 8: discharge trap conduit [0129] 8a: inlet of the discharge trap conduit [0130] 10: rim spout port [0131] 14: jet spout port [0132] 18: waste receiving surface [0133] 18a: front end of the waste receiving surface [0134] 18b: concave portion of the waste receiving surface [0135] 20: rim [0136] 20a: inner peripheral surface of the rim [0137] 20b: lower end of the rim [0138] 20c: bonding portion of the rim [0139] 20d: upper end of the rim [0140] 21: shelf surface [0141] 22: basin [0142] 22a: front end of the basin [0143] 40: rim upper part [0144] 42: body