Flush toilet

Abstract

A flush toilet includes a toilet main body including a bowl portion configured to receive waste, a jet water spout port configured to eject flush water, a jet water conduit configured to guide the flush water to the jet water spout port, and a drain trap conduit; a flush water tank configured to store the flush water to be supplied to the toilet main body, the flush water tank having a jet drain port configured to discharge the stored flush water to the toilet main body; a jet drain valve; a water guide member provided below the jet drain port of the flush water tank and configured to guide the flush water from the jet drain port to the jet water conduit; and a fixing portion configured to fix the water guide member to the toilet main body. The fixing portion is provided inside the jet drain port.

Description

CROSS REFERENCES TO RELATED APPLICATIONS

[0001] The present invention contains subject matter related to Japanese Patent Application No. 2025-058437 filed in the Japan Patent Office on Mar. 31, 2025, the entire contents of which are incorporated herein by reference.BACKGROUND OF THE INVENTION1. Field of the Invention

[0002] The present invention relates to a flush toilet and, more particularly, to a flush toilet that washes with flush water and discharges waste.2. Description of the Related Art

[0003] In the related art, as described in International Publication No. 2005 / 085538, a siphon jet-type flush toilet is known that induces siphonage by jet water ejection to discharge waste. Such a flush toilet has a jet water spout port that is provided at a lower portion of a bowl portion and that ejects flush water toward an inlet of a drain trap conduit, and a jet water conduit that is connected to a flush water tank and that supplies flush water to the jet water spout port. When flush water is supplied from the flush water tank to the jet water conduit, the flush water flows through the jet water conduit and is ejected from the jet water spout port. The flush water ejected from the jet water spout port flows into the drain trap conduit so as to induce siphonage.

[0004] Here, in the flush toilet described in International Publication No. 2005 / 085538 mentioned above, in order to stably supply flush water to the jet water spout port, for example, it is conceivable to provide a water guide member made of a resin in the jet water conduit and to guide the flush water toward the jet water spout port by the water guide member. Such a water guide member has an advantage in that flush water can be stably supplied to the jet water spout port because manufacturing variations do not occur compared to a ceramic water conduit. In addition, as a method for fixing the water guide member to the toilet main body, it is conceivable to form a fixing hole for fixing the water guide member in the toilet main body and to fix the water guide member to the toilet main body with a bolt or the like. However, forming a fixing hole in the toilet main body poses a problem in that there is a possibility that flush water will leak from the fixing hole and that manufacturing costs in a manufacturing process will increase.SUMMARY OF THE INVENTION

[0005] Accordingly, it is an object of the present invention to provide a flush toilet capable of easily fixing a water guide member to a toilet main body while suppressing the occurrence of water leakage and an increase in manufacturing costs.

[0006] To achieve the above-described object, the present invention provides a flush toilet configured to wash with flush water and to discharge waste, the flush toilet including a toilet main body including a bowl portion configured to receive waste, a spout port provided at the bowl portion and configured to eject flush water, a water conduit configured to guide the flush water to the spout port, and a drain trap conduit connected to a lower portion of the bowl portion and configured to discharge waste; a flush water tank configured to store the flush water to be supplied to the toilet main body, the flush water tank having a drain port configured to discharge the flush water stored in the flush water tank to the toilet main body; a jet drain valve configured to open and close the drain port of the flush water tank; a water guide member provided below the drain port of the flush water tank and configured to guide the flush water from the drain port of the flush water tank to the water conduit; and a fixing portion configured to fix the water guide member to the toilet main body, wherein the fixing portion is provided inside the drain port of the flush water tank.

[0007] According to the present invention configured as described above, since the fixing portion of the water guide member is provided inside the drain port of the flush water tank, it is not necessary to form a fixing hole in the toilet main body. Therefore, the water guide member can be fixed to the toilet main body while suppressing the occurrence of water leakage and an increase in manufacturing costs.

[0008] In the present invention, the fixing portion preferably includes a fastener, a fixing hole portion provided inside the drain port and configured to receive the fastener, and a retainer connected to the fastener and configured to come into contact with a ceiling surface of the toilet main body.

[0009] According to the present invention configured as described above, since the fixing portion includes the fastener, the fixing hole portion provided inside the drain port and configured to receive the fastener, and the retainer connected to the fastener and configured to come into contact with the ceiling surface of the toilet main body, the water guide member can be easily fixed to the toilet main body.

[0010] In the present invention, a spout opening of the water guide member is preferably an opening configured to eject the flush water into the water conduit and is preferably an opening configured to allow the water guide member to be fixed to the toilet main body by the fixing portion.

[0011] According to the present invention configured as described above, since the spout opening of the water guide member is an opening configured to eject the flush water into the water conduit and is an opening configured to allow the water guide member to be fixed to the toilet main body by the fixing portion, the water guide member can be fixed to the toilet main body by using the spout opening of the water guide member.

[0012] In the present invention, the fixing portion is preferably provided at a left end or a right end of the spout opening.

[0013] According to the present invention configured as described above, since the fixing portion is provided at a left end or a right end of the spout opening, obstruction by the fixing portion of the flow of flush water inside the water guide member can be suppressed.

[0014] In the present invention, the water guide member preferably has a fixing opening separate from the spout opening of the water guide member, and the fixing opening is preferably configured to allow the water guide member to be fixed to the toilet main body by the fixing portion.

[0015] According to the present invention configured as described above, since the water guide member has a fixing opening separate from the spout opening of the water guide member, and the fixing opening is configured to allow the water guide member to be fixed to the toilet main body by the fixing portion, the water guide member can be stably fixed to the toilet main body.

[0016] In the present invention, the fixing opening is preferably formed to have a minimum size allowing the retainer of the fixing portion to pass therethrough.

[0017] According to the present invention configured as described above, since the fixing opening is formed to have a minimum size allowing the retainer of the fixing portion to pass therethrough, obstruction by the fixing opening of the flow of flush water inside the water guide member can be suppressed.

[0018] In the present invention, the spout opening is preferably located at a front portion of the water guide member, and the fixing opening is preferably located at a rear portion of the water guide member.

[0019] According to the present invention configured as described above, since the spout opening is located at the front portion of the water guide member, and the fixing opening is located at the rear portion of the water guide member, obstruction by the fixing opening of the flow of flush water inside the water guide member can be further suppressed.

[0020] In the present invention, the fixing portion is preferably located at a position other than a left end and a right end of the drain port of the flush water tank.

[0021] According to the present invention configured as described above, since the fixing portion is located at a position other than the left end and the right end of the drain port of the flush water tank, the width of the water conduit in the lateral direction can be reduced.

[0022] In the present invention, the fixing portion is preferably located at a position above an upper end of a spout opening of the water guide member.

[0023] According to the present invention configured as described above, since the fixing portion is located at a position above the upper end of the spout opening of the water guide member, obstruction by the fixing portion of the flow of flush water ejected from the spout opening can be suppressed.

[0024] In the present invention, the fixing portion is preferably located below a valve seat on which a valve body of the jet drain valve is seated and from which the valve body is unseated.

[0025] According to the present invention configured as described above, since the fixing portion is located below the valve seat on which the valve body of the jet drain valve is seated and from which the valve body is unseated, water leakage from the fixing portion to the outside of the toilet can be reliably prevented.

[0026] In the present invention, the water guide member is preferably provided with a slit portion configured to restrict the retainer from rotating together with the fastener when the fastener is rotated.

[0027] According to the present invention configured as described above, since the water guide member is provided with the slit portion configured to restrict the retainer from rotating together with the fastener when the fastener is rotated, the water guide member can be easily fixed to the toilet main body.

[0028] In the present invention, the water guide member is preferably provided with a stopper portion configured to retain the retainer inside the water guide member when the retainer moves downward to a position below the slit portion.

[0029] According to the present invention configured as described above, since the water guide member is provided with the stopper portion configured to retain the retainer inside the water guide member when the retainer moves downward to a position below the slit portion, when the fastener is rotated in a loosening direction, the retainer appears inside the water guide member and stops as viewed from above the flush water tank. Therefore, a timing for removing the water guide member can be easily determined.

[0030] According to the flush toilet of the present invention, the water guide member can be easily fixed to the toilet main body while suppressing the occurrence of water leakage and an increase in manufacturing costs.BRIEF DESCRIPTION OF THE DRAWINGS

[0031] FIG. 1 is a plan view of a flush toilet according to an embodiment of the present invention.

[0032] FIG. 2 is a sectional view taken along line II-II of FIG. 1.

[0033] FIG. 3 is an exploded perspective view of a flush water tank of the flush toilet according to the embodiment of the present invention.

[0034] FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. 1.

[0035] FIG. 5 is a cross-sectional view taken along line V-V of FIG. 4.

[0036] FIG. 6A is a perspective view of a water guide member of the flush toilet according to the embodiment of the present invention as viewed from below on a front-left side.

[0037] FIG. 6B is a perspective view of the water guide member of the flush toilet according to the embodiment of the present invention as viewed from below on a rear-right side.

[0038] FIG. 7 is a cross-sectional view taken along line VII-VII of FIG. 2.

[0039] FIG. 8 is a plan view of the water guide member of the flush toilet according to the embodiment of the present invention as viewed from above.

[0040] FIG. 9A is a diagram illustrating a procedure for attaching the water guide member of the flush toilet according to the embodiment of the present invention to a toilet main body and is a diagram illustrating a state in which the water guide member is inserted into a jet water conduit.

[0041] FIG. 9B is a diagram illustrating the procedure for attaching the water guide member of the flush toilet according to the embodiment of the present invention to the toilet main body and is a diagram illustrating a state in which a fixing metal fitting of a fixing portion is rotating.

[0042] FIG. 9C is a diagram illustrating the procedure for attaching the water guide member of the flush toilet according to the embodiment of the present invention to the toilet main body and is a diagram illustrating a state in which the fixing metal fitting of the fixing portion is rising.

[0043] FIG. 9D is a diagram illustrating the procedure for attaching the water guide member of the flush toilet according to the embodiment of the present invention to the toilet main body and is a diagram illustrating a state in which attachment of the water guide member is completed.DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0044] A flush toilet according to an embodiment of the present invention will be described below with reference to the drawings.

[0045] First, a basic structure of a flush toilet 1 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3.

[0046] FIG. 1 is a plan view of the flush toilet according to the embodiment of the present invention. FIG. 2 is a sectional view taken along line II-II of FIG. 1. FIG. 3 is an exploded perspective view of the flush toilet according to the embodiment of the present invention. In FIGS. 1 and 2, a rim water conduit and a jet water conduit are each indicated by a broken line.

[0047] Note that, in the present specification, when viewed from the front of the flush toilet, the near side is referred to as a front side, the far side is referred to as a rear side, the right side is referred to as a right side, and the left side is referred to as a left side. When viewed from above the flush toilet, the center side of a toilet is referred to as an inner side, and the outline side of the toilet is referred to as an outer side.

[0048] As illustrated in FIGS. 1 and 2, the flush toilet 1 according to the embodiment of the present invention is a siphon jet-type flush toilet that induces siphonage by jet water ejection to discharge waste.

[0049] As illustrated in FIG. 1, the flush toilet 1 includes a toilet main body 2 and a flush water tank 4 disposed on a rear upper portion of the toilet main body 2. The toilet main body 2 and the flush water tank 4 are integrally made of a ceramic. The flush water tank 4 is provided with a lever handle (not illustrated), and toilet flushing is performed in response to a user operating the lever handle.

[0050] The toilet main body 2 includes a bowl portion 6 that receives waste, a drain trap conduit 8 that is provided at a bottom portion of the bowl portion 6 for discharging waste by siphonage, a rim water spout port 10 that performs rim water ejection, a rim water conduit 12 that supplies flush water to the rim water spout port 10, a jet water spout port 14 that performs jet water ejection, and a jet water conduit 16 that supplies flush water to the jet water spout port 14. The rim water conduit 12 and the jet water conduit 16 are each provided independently. Note that, in the flush toilet 1 according to the embodiment of the present invention, although the rim water conduit 12 and the jet water conduit 16 are each provided independently, they may be constituted by a single common water conduit.

[0051] The bowl portion 6 includes a waste receiving surface 18, a rim portion 20, a shelf surface 22, and a well portion 24. The waste receiving surface 18 is bowl-shaped and receives waste. The rim portion 20 is formed along an upper edge portion of the bowl portion 6 and has an inner peripheral surface 20a that overhangs toward the inside of the bowl portion 6. The shelf surface 22 is formed between the waste receiving surface 18 and the rim portion 20. The well portion 24 is formed below the waste receiving surface 18, and retained water W is formed in the well portion 24. The water level of the retained water W is at an initial water level WL0 in a standby state before the start of flushing.

[0052] The drain trap conduit 8 has an inlet 8a, an ascending conduit 8b that extends upward from the inlet 8a, a descending conduit 8c that extends downward from the ascending conduit 8b, and an apex 8d that is located between the descending conduit 8c and the ascending conduit 8b and that defines the initial water level WL0 of the retained water W. A lower end of the descending conduit 8c of the drain trap conduit 8 is connected to a drain pipe (not illustrated) on a building side via a drain socket (not illustrated).

[0053] The rim water spout port 10 is formed at the rim portion 20 and is located on the right side of the bowl portion 6 and in the vicinity of the center of the bowl portion 6 in the front-rear direction. The rim water spout port 10 is formed so as to be open forward. Flush water ejected from the rim water spout port 10 swirls clockwise on the shelf surface 22 along the inner peripheral surface 20a of the rim portion 20. The flush water swirls on the shelf surface 22 in this manner, so that the flush water flows down from the shelf surface 22 to the waste receiving surface 18 to wash the waste receiving surface 18. Note that, in the flush toilet 1 according to the embodiment of the present invention, although only the single rim water spout port 10 is provided, two or more rim water spout ports may be provided.

[0054] The rim water conduit 12 has an upstream end that is connected to a rim drain port 4b formed in a bottom surface portion 4a of the flush water tank 4, and a downstream end that is connected to the rim water spout port 10. When viewed in plan view, the rim water conduit 12 extends substantially linearly forward from the rim drain port 4b of the flush water tank 4 (see FIG. 1). Flush water is supplied from the flush water tank 4 to the rim water conduit 12, and the flush water is ejected from the rim water spout port 10 by a head pressure of the flush water stored in the flush water tank 4. Note that, in the flush toilet 1 according to the embodiment of the present invention, although flush water from the flush water tank 4 is supplied to the rim water conduit 12, the rim water conduit 12 may be directly connected to a water supply source such as a water supply system, and flush water from the water supply source, such as a water supply system, may be directly supplied to the rim water conduit 12.

[0055] The jet water spout port 14 is formed at the bottom portion of the bowl portion 6. The jet water spout port 14 is disposed so as to face the inlet 8a of the drain trap conduit 8 and directed toward the inlet 8a of the drain trap conduit 8. Flush water is ejected from the jet water spout port 14 toward the inlet 8a of the drain trap conduit 8 so as to induce siphonage at an early stage.

[0056] The jet water conduit 16 has an upstream end that is connected to a jet drain port 4c formed in the bottom surface portion 4a of the flush water tank 4, and a downstream end that is connected to the jet water spout port 14. The jet water conduit 16 includes a main water conduit 16a, a left curved flow path 16b, a right curved flow path 16c, and an outlet flow path 16d. The main water conduit 16a extends linearly forward from the jet drain port 4c of the flush water tank 4. The left curved flow path 16b branches from a downstream end of the main water conduit 16a, curves to the left side, and extends forward. The right curved flow path 16c branches from the downstream end of the main water conduit 16a, curves to the right side, and extends forward. The outlet flow path 16d extends linearly rearward and is connected to the jet water spout port 14, and a downstream end of the left curved flow path 16b and a downstream end of the right curved flow path 16c merge at the outlet flow path 16d (see FIG. 1). The flush water is supplied from the flush water tank 4 to the jet water conduit 16, and the flush water is ejected from the jet water spout port 14 by a head pressure of the flush water stored in the flush water tank 4. Note that, in the flush toilet 1 according to the embodiment of the present invention, although flush water from the flush water tank 4 is supplied to the jet water conduit 16, the jet water conduit 16 may be directly connected to a water supply source such as a water supply system, and flush water from the water supply source, such as a water supply system, may be directly supplied to the jet water conduit 16.

[0057] The flush water tank 4 is a tank that stores flush water supplied from a water supply source (not illustrated) such as a water supply system. In addition, the flush water tank 4 is a gravity-fed tank that supplies the stored flush water to the toilet main body 2 by using gravity. The flush water tank 4 includes an outer tank 26 that is made of a ceramic and an inner tank 28 that is made of a resin and disposed inside the outer tank 26. A jet drain port 26b and a rim drain port 26c are provided at a bottom surface portion 26a of the outer tank 26. In addition, a jet drain port 28b is provided in a bottom surface portion 28a of the inner tank 28. Note that, in the flush toilet 1 according to the embodiment of the present invention, although the flush water tank 4 includes the outer tank 26 and the inner tank 28, the flush water tank 4 may include only the outer tank 26 without the inner tank 28 or may include only the inner tank 28 without the outer tank 26.

[0058] The flush water stored in the outer tank 26 (and outside the inner tank 28) flows into the rim water conduit 12 through the rim drain port 26c of the outer tank 26. In addition, flush water stored in the inner tank 28 flows into the jet water conduit 16 through the jet drain port 28b of the inner tank 28 and through the jet drain port 26b of the outer tank 26. Note that, in the flush toilet 1 according to the embodiment of the present invention, although the rim drain port 4b and the jet drain port 4c are provided separately from each other, the rim drain port 4b and the jet drain port 4c may be constituted by a single drain port.

[0059] An outer wall portion 30 that extends upward in the vertical direction from the outer periphery of the jet drain port 28b is formed on the bottom surface portion 28a of the inner tank 28. The outer wall portion 30 is formed integrally with the inner tank 28. The outer wall portion 30 is formed in a cylindrical shape and disposed so as to surround the jet drain port 28b. An overflow pipe 32 is integrally formed on the outer wall portion 30 on a front-right side. The overflow pipe 32 is formed so as to extend in the horizontal direction from the outer wall portion 30, bend at a right angle, and then extend upward in the vertical direction. An upper end of the overflow pipe 32 is open to the atmosphere, and the overflow pipe 32 is configured to drain overflowed flush water in the flush water tank 4 into the toilet main body 2. In addition, an overflow cap 31 is attached to the upper end of the overflow pipe 32 so that foreign matter or the like does not flow into the overflow pipe 32.

[0060] A water guide member 34 that extends downward in the vertical direction from the jet drain port 28b is provided at the bottom surface portion 28a of the inner tank 28. The water guide member 34 is made of a resin material and formed integrally with the inner tank 28 (see FIG. 3). When the inner tank 28 is attached to the outer tank 26, the water guide member 34 is disposed inside the jet water conduit 16. In addition, a drain flow path for guiding flush water that has flowed into the water guide member 34 to the jet water conduit 16 is formed inside the water guide member 34. Note that, in the flush toilet 1 according to the embodiment of the present invention, although the water guide member 34 is integrated with the inner tank 28, the water guide member 34 may be provided separately from the inner tank 28.

[0061] A seal member 35 that seals between a jet drain valve 33 and the toilet main body 2 in a watertight manner is provided therebetween. Specifically, the seal member 35 is provided on the outer peripheral surface of the jet drain port 28b of the inner tank 28 and seals between the inner tank 28 and the toilet main body 2 in a watertight manner. The seal member 35 is a ring-shaped rubber packing member. Note that, in the embodiment of the present invention, although the seal member 35 is provided on the outer peripheral surface of the jet drain port 28b of the inner tank 28, the seal member 35 may be provided at the jet drain valve 33 or at the water guide member 34.

[0062] The jet drain valve 33 is provided at the jet drain port 28b of the inner tank 28. The jet drain valve 33 includes a drain flow path member 36 forming a drain flow path, a valve body (not illustrated) that opens and closes a drain port 36a of the drain flow path member 36, and a drive mechanism (not illustrated) that drives the valve body in response to a user operating the lever handle.

[0063] The drain flow path member 36 is made of a resin material and includes an inner wall portion 36b, a valve seat 36c, and a communication port 36d. The inner wall portion 36b forms the drain flow path. The valve seat 36c protrudes upward from an upper surface of the inner wall portion 36b, and the valve body is seated on or unseated from the valve seat 36c. The communication port 36d allows the flush water in the inner tank 28 to flow into the drain flow path of the inner wall portion 36b. The inner wall portion 36b of the drain flow path member 36 is formed in a cylindrical shape and extends downward in the vertical direction through the inside of the jet drain port 28b and through the inside of the water guide member 34.

[0064] The valve body of the jet drain valve 33 is configured to move up and down in the vertical direction to open and close the drain port 36a of the drain flow path member 36. The drive mechanism is, for example, a water-pressure drive mechanism that is driven by a water supply pressure of flush water supplied from the water supply source. The drive mechanism is configured such that, when a user operates the lever handle, the water supply pressure of the flush water acts to pull up the valve body of the jet drain valve 33, and after a predetermined time has elapsed, the water supply pressure of the flush water stops acting, causing the valve body of the jet drain valve 33 to descend.

[0065] A rim drain valve device (not illustrated) is provided at the rim drain port 26c of the outer tank 26. The rim drain valve device is disposed above the rim drain port 26c and configured such that a valve body thereof moves up and down in the vertical direction in response to a user operating the lever handle to open and close the rim drain port 4b.

[0066] A water supply valve device (not illustrated) for supplying flush water is provided inside the outer tank 26 (and outside the inner tank 28). The water supply valve device is configured to switch between supplying and stopping flush water to the outer tank 26 and the inner tank 28. The water supply valve device includes a float (not illustrated) that opens and closes a valve body in accordance with the water level in the outer tank 26, and is configured to open the valve body when the water level in the outer tank 26 drops below a full water level and to close the valve body when the water level in the outer tank 26 reaches the full water level.

[0067] Next, the water guide member 34 of the flush toilet 1 according to the embodiment of the present invention will be described in detail with reference to FIG. 2 and FIGS. 4 to 8.

[0068] FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. 1. FIG. 5 is a cross-sectional view taken along line V-V of FIG. 4. FIG. 6A is a perspective view of the water guide member of the flush toilet according to the embodiment of the present invention as viewed from below on a front-left side. FIG. 6B is a perspective view of the water guide member of the flush toilet according to the embodiment of the present invention as viewed from below on a rear-right side. FIG. 7 is a cross-sectional view taken along line VII-VII of FIG. 2. FIG. 8 is a plan view of the water guide member of the flush toilet according to the embodiment of the present invention as viewed from above.

[0069] As illustrated in FIG. 2, the water guide member 34 is a member for guiding the flush water discharged from the jet drain port 4c of the flush water tank 4 to the jet water conduit 16 while rectifying the flush water. The water guide member 34 is made of a resin material and extends from the jet drain port 4c into the jet water conduit 16. Thus, the flush water discharged from the jet drain port 4c of the flush water tank 4 can be prevented from colliding with a bottom surface portion 16e of the jet water conduit 16, thereby avoiding generation of turbulence, and the flush water can flow while being rectified.

[0070] The water guide member 34 includes a vertically extending wall portion 34a, a spout opening 34b, and a receiving surface portion 34c that are arranged in this order from the upstream side. The vertically extending wall portion 34a extends downward in the vertical direction from the jet drain port 28b of the inner tank 28. The spout opening 34b is formed in a front portion of the vertically extending wall portion 34a. The receiving surface portion 34c is bent and extends forward from the lower end of a rear portion of the vertically extending wall portion 34a. In addition, an inclined surface portion 34d is provided at a rear portion of the receiving surface portion 34c. The inclined surface portion 34d is set such that an inclination angle at which the inclined surface portion 34d is inclined downward with respect to the horizontal direction is larger than that of a front portion of the receiving surface portion 34c.

[0071] The vertically extending wall portion 34a of the water guide member 34 is formed in a cylindrical shape and extends through the jet drain port 26b of the outer tank 26 to be inserted into the jet water conduit 16. The lower end of the vertically extending wall portion 34a is located below an upper surface portion 16f of the jet water conduit 16.

[0072] The spout opening 34b of the water guide member 34 is open laterally toward the front. In addition, the spout opening 34b is formed so as to be open in a flow direction of the flush water flowing through the jet water conduit 16. Furthermore, the spout opening 34b is formed in a substantially rectangular shape that is flat and long in the lateral direction when viewed from the front. The upper end of the spout opening 34b is located below the upper surface portion 16f of the jet water conduit 16, and the lower end of the spout opening 34b is located above the bottom surface portion 16e of the jet water conduit 16. The flush water that has flowed into the water guide member 34 is ejected from the spout opening 34b into the jet water conduit 16.

[0073] The receiving surface portion 34c of the water guide member 34 is disposed in an entire region into which the drain port 36a of the drain flow path member 36 is projected downward in the vertical direction. In other words, the receiving surface portion 34c is configured to receive all the flush water discharged from the drain port 36a of the drain flow path member 36. The receiving surface portion 34c is disposed so as to form a gap between the receiving surface portion 34c and the bottom surface portion 16e of the jet water conduit 16 and disposed so as not to come into contact with the bottom surface portion 16e of the jet water conduit 16. The receiving surface portion 34c is formed so as to be substantially parallel to the bottom surface portion 16e of the jet water conduit 16.

[0074] As illustrated in FIG. 4, the water guide member 34 includes two fixing portions 38 and 40 for fixing the water guide member 34 to the toilet main body 2. The fixing portion 38 includes a fixing screw (fastener) 38a, a fixing hole portion 38b, a fixing metal fitting (retainer) 38c, a slit portion 38d, and a stopper portion 38e. The fixing screw 38a is inserted into the fixing hole portion 38b. The fixing metal fitting 38c comes into contact with a ceiling surface of the toilet main body 2. The slit portion 38d is provided in order to restrict the fixing metal fitting 38c from rotating together with the fixing screw 38a when the fixing screw 38a is rotated. The stopper portion 38e is provided in order to retain the fixing metal fitting 38c inside the jet drain port 4c of the flush water tank 4 when the fixing metal fitting 38c moves downward below the slit portion 38d. The fixing portion 40 includes a fixing screw (fastener) 40a, a fixing hole portion 40b, a fixing metal fitting (retainer) 40c, a slit portion 40d, and a stopper portion 40e. The fixing screw 40a is inserted into the fixing hole portion 40b. The fixing metal fitting 40c comes into contact with the ceiling surface of the toilet main body 2. The slit portion 40d is provided in order to restrict the fixing metal fitting 40c from rotating together with the fixing screw 40a when the fixing screw 40a is rotated. The stopper portion 40e is provided in order to retain the fixing metal fitting 40c inside the jet drain port 4c of the flush water tank 4 when the fixing metal fitting 40c moves downward below the slit portion 40d.

[0075] As illustrated in FIG. 5, each of the fixing hole portions 38b and 40b is provided inside the jet drain port 4c of the flush water tank 4 (the jet drain port 26b of the outer tank 26). Each of the fixing hole portions 38b and 40b is formed so as to protrude from an inner peripheral surface of the vertically extending wall portion 34a of the water guide member 34 into the drain flow path through which the flush water flows. The fixing hole portion 38b is located on the front-left side of the water guide member 34, and the fixing hole portion 40b is located on the rear-right side of the water guide member 34. Each of the fixing hole portions 38b and 40b is disposed on a center line CL1 passing through a center O of the jet drain port 4c of the flush water tank 4.

[0076] Each of the fixing screws 38a and 40a includes a head portion and a screw portion that extends downward in the vertical direction from the head portion and on which an external thread is formed. The fixing screw 38a is inserted into the fixing hole portion 38b from above such that the head portion comes into contact with an upper surface of the fixing hole portion 38b and such that the screw portion extends through the fixing hole portion 38b. The fixing screw 40a is inserted into the fixing hole portion 40b from above such that the head portion comes into contact with an upper surface of the fixing hole portion 40b and such that the screw portion extends through the fixing hole portion 40b.

[0077] Each of the fixing metal fittings 38c and 40c includes a main body portion that is made of a metal and formed in a rectangular parallelepiped shape and a through-hole that is formed at one end of the main body portion and in which an internal thread is formed. The screw portions of the fixing screws 38a and 40a are respectively screwed into the through-holes of the fixing metal fittings 38c and 40c. When the fixing screws 38a and 40a are rotated in a tightening direction, the fixing metal fittings 38c and 40c move upward along the respective screw portions, and upper surfaces of the fixing metal fittings 38c and 40c come into contact with the ceiling surface of the toilet main body 2. Consequently, the toilet main body 2 is sandwiched between the bottom surface portion 28a of the inner tank 28 and the fixing metal fittings 38c and 40c, and the water guide member 34 is fixed to the toilet main body 2. On the other hand, when the fixing screws 38a and 40a are rotated in a loosening direction, the fixing metal fittings 38c and 40c move downward along the respective screw portions, and the upper surfaces of the fixing metal fittings 38c and 40c move away from the ceiling surface of the toilet main body 2.

[0078] As illustrated in FIG. 6A, the fixing portion 38 is provided at the left end of the spout opening 34b, which is located at the front of the water guide member 34. In addition, the fixing portion 38 is provided above the upper end of the spout opening 34b (see FIG. 4). Furthermore, the fixing portion 38 is located below the valve seat 36c on which the valve body of the jet drain valve 33 is seated and from which the valve body is unseated (see FIG. 4).

[0079] The slit portion 38d of the fixing portion 38 is formed of a recessed slit (groove) having a size that allows the fixing metal fitting 38c to pass therethrough, and extends upward in the vertical direction from an upper-left corner of the spout opening 34b. When the fixing metal fitting 38c is inserted into the slit portion 38d, rotation of the fixing metal fitting 38c is restricted by an inner side surface of the slit portion 38d such that the fixing metal fitting 38c does not rotate together with the fixing screw 38a. The stopper portion 38e is provided at the left end of the spout opening 34b below the slit portion 38d. The stopper portion 38e is a left end portion of the spout opening 34b. After the fixing screw 38a has been rotated in the loosening direction and the fixing metal fitting 38c has moved downward to a position below the slit portion 38d, the stopper portion 38e restricts rotation of the fixing metal fitting 38c and retains the fixing metal fitting 38c inside the water guide member 34.

[0080] As illustrated in FIG. 6B, a fixing opening 42 for fixing the water guide member 34 to the toilet main body 2 by using the fixing portion 40 is provided in a rear portion of the water guide member 34 separately from the spout opening 34b. The fixing opening 42 is formed in a flat shape that is long in the lateral direction, and is formed to have a minimum size that allows the fixing metal fitting 40c of the fixing portion 40 to pass therethrough (a size slightly larger than that of a side surface of the fixing metal fitting 40c). The fixing portion 40 is located at the right end of the fixing opening 42. In addition, the fixing portion 40 is located above the upper end of the spout opening 34b (see FIG. 4). Furthermore, the fixing portion 40 is located below the valve seat 36c, on which the valve body of the jet drain valve 33 is seated and from which the valve body is unseated (see FIG. 4).

[0081] The slit portion 40d of the fixing portion 40 is formed of a recessed slit (groove) having a size that allows the fixing metal fitting 40c to pass therethrough, and extends upward in the vertical direction from an upper-right corner of the fixing opening 42. When the fixing metal fitting 40c is inserted into the slit portion 40d, rotation of the fixing metal fitting 40c is restricted by an inner side surface of the slit portion 40d such that the fixing metal fitting 40c does not rotate together with the fixing screw 40a. The stopper portion 40e is provided at the right end of the fixing opening 42 below the slit portion 40d. The stopper portion 40e is a right end portion of the fixing opening 42. After the fixing screw 40a has been rotated in the loosening direction and the fixing metal fitting 40c has moved downward to a position below the slit portion 40d, the stopper portion 40e restricts rotation of the fixing metal fitting 40c and retains the fixing metal fitting 40c inside the water guide member 34.

[0082] As illustrated in FIG. 7, the fixing portions 38 and 40 are located at positions other than the left end and the right end of the jet drain port 4c of the flush water tank 4 (see the dotted line in FIG. 7). Specifically, the fixing portions 38 and 40 are not located on a center line CL2 that bisects the jet drain port 4c of the flush water tank 4 in the front-rear direction. The fixing portion 38 is located forward of the center line CL2 of the jet drain port 4c of the flush water tank 4, and the fixing portion 40 is located rearward of the center line CL2 of the jet drain port 4c of the flush water tank 4. Consequently, a width of the jet water conduit 16 in the lateral direction can be reduced compared with the case where the fixing portions 38 and 40 are located at the left end and the right end (on the center line CL2) of the jet drain port 4c.

[0083] As illustrated in FIG. 8, the fixing metal fittings 38c and 40c of the fixing portions 38 and 40 are retained inside the jet drain port 4c of the flush water tank 4 (see the dotted line in FIG. 8) in a state of being in contact with the stopper portions 38e and 40e, respectively. In other words, the fixing metal fittings 38c and 40c are retained at positions visible from the jet drain port 28b of the inner tank 28. Thus, during removal of the inner tank 28 and the water guide member 34 from the outer tank 26, when the fixing screws 38a and 40a are rotated in the loosening direction, the fixing metal fittings 38c and 40c appear inside the water guide member 34 and stop, as viewed from above the flush water tank 4. Therefore, a timing for removing the water guide member 34 can be easily determined.

[0084] Next, a procedure for attaching the water guide member 34 to the toilet main body 2 in the flush toilet 1 according to the embodiment of the present invention will be described with reference to FIGS. 9A to 9D.

[0085] FIGS. 9A to 9D are diagrams illustrating the procedure for attaching the water guide member to the toilet main body in the flush toilet according to the embodiment of the present invention. FIG. 9A is a diagram illustrating a state in which the water guide member is inserted into the jet water conduit. FIG. 9B is a diagram illustrating a state in which the fixing metal fittings of the fixing portions are rotating. FIG. 9C is a diagram illustrating a state in which each of the fixing metal fittings of the fixing portion is rising. FIG. 9D is a diagram illustrating a state in which attachment of the water guide member is completed.

[0086] First, as illustrated in FIG. 9A, the fixing screws 38a and 40a extend through the respective fixing hole portions 38b and 40b, and the fixing metal fittings 38c and 40c are connected to lower ends of the respective fixing screws 38a and 40a. In addition, the fixing metal fittings 38c and 40c are located inside the water guide member 34. In a state where the fixing metal fittings 38c and 40c are located inside the water guide member 34, the water guide member 34 is inserted into the jet water conduit 16 through the jet drain port 4c of the flush water tank 4.

[0087] Next, as illustrated in FIG. 9B, when the fixing screw 38a is rotated in the tightening direction, the fixing metal fitting 38c rotates through the spout opening 34b and comes into contact with the left end of the spout opening 34b. At this time, the fixing metal fitting 38c protrudes to the outside of the water guide member 34. In addition, when the fixing screw 40a is rotated in the tightening direction, the fixing metal fitting 40c rotates through the fixing opening 42 and comes into contact with the left end of the fixing opening 42. At this time, the fixing metal fitting 40c protrudes to the outside of the water guide member 34.

[0088] In addition, as illustrated in FIG. 9C, when the fixing screw 38a is rotated in the tightening direction, rotation of the fixing metal fitting 38c is restricted by the left end of the spout opening 34b, and the fixing metal fitting 38c moves upward. When the fixing screw 38a is further rotated in the tightening direction, rotation of the fixing metal fitting 38c is restricted by the inner side surface of the slit portion 38d, and the fixing metal fitting 38c moves upward along the slit portion 38d. Thus, the fixing metal fitting 38c does not rotate together with the fixing screw 38a. Similarly, when the fixing screw 40a is rotated in the tightening direction, the fixing metal fitting 40c moves upward along the slit portion 40d.

[0089] Finally, as illustrated in FIG. 9D, when the fixing metal fittings 38c and 40c come into contact with the ceiling surface of the toilet main body 2, the toilet main body 2 is sandwiched between the bottom surface portion 28a of the inner tank 28 and the fixing metal fittings 38c and 40c, and the water guide member 34 is fixed to the toilet main body 2. Thus, attachment of the water guide member 34 to the toilet main body 2 is completed.

[0090] Operational effects according to the above-described embodiment of the present invention will be described below. First, according to the flush toilet 1 of the embodiment of the present invention, since the fixing portions 38 and 40 of the water guide member 34 are provided inside the jet drain port 4c of the flush water tank 4, it is not necessary to form a fixing hole in the toilet main body 2. Therefore, the water guide member 34 can be fixed to the toilet main body 2 while suppressing the occurrence of water leakage and an increase in manufacturing costs.

[0091] In addition, according to the flush toilet 1 of the embodiment of the present invention, the fixing portion 38 includes the fixing screw 38a, the fixing hole portion 38b, which is provided inside the jet drain port 4c of the flush water tank 4 and into which the fixing screw 38a is inserted, and the fixing metal fitting 38c, which is connected to the fixing screw 38a and which comes into contact with the ceiling surface of the toilet main body 2. The fixing portion 40 includes the fixing screw 40a, the fixing hole portion 40b, which is provided inside the jet drain port 4c of the flush water tank 4 and into which the fixing screw 40a is inserted, and the fixing metal fitting 40c, which is connected to the fixing screw 40a and which comes into contact with the ceiling surface of the toilet main body 2. Therefore, the water guide member 34 can be easily fixed to the toilet main body 2.

[0092] According to the flush toilet 1 of the embodiment of the present invention, the spout opening 34b of the water guide member 34 is an opening for ejecting flush water into the jet water conduit 16 and is an opening for fixing the water guide member 34 to the toilet main body 2 by using the fixing portion 38. Therefore, the water guide member 34 can be fixed to the toilet main body 2 by using the spout opening 34b of the water guide member 34.

[0093] In addition, according to the flush toilet 1 of the embodiment of the present invention, since the fixing portion 38 is provided at the left end (or the right end) of the spout opening 34b, obstruction by the fixing portion 38 of the flow of the flush water inside the water guide member 34 can be suppressed.

[0094] According to the flush toilet 1 of the embodiment of the present invention, since the fixing opening 42 for fixing the water guide member 34 to the toilet main body 2 by using the fixing portion 40 is provided in the water guide member 34 separately from the spout opening 34b of the water guide member 34, the water guide member 34 can be stably fixed to the toilet main body 2.

[0095] In addition, according to the flush toilet 1 of the embodiment of the present invention, since the fixing opening 42 is formed to have a minimum size that allows the fixing metal fitting 40c of the fixing portion 40 to pass therethrough, obstruction by the fixing opening 42 of the flow of the flush water inside the water guide member 34 can be suppressed.

[0096] According to the flush toilet 1 of the embodiment of the present invention, the spout opening 34b is located at the front of the water guide member 34, and the fixing opening 42 is located at the rear of the water guide member 34. Thus, obstruction by the fixing opening 42 of the flow of the flush water inside the water guide member 34 can be further suppressed.

[0097] In addition, according to the flush toilet 1 of the embodiment of the present invention, since the fixing portions 38 and 40 are located at positions other than the left end and the right end of the jet drain port 4c of the flush water tank 4, the width of the jet water conduit 16 in the lateral direction can be reduced.

[0098] According to the flush toilet 1 of the embodiment of the present invention, since the fixing portions 38 and 40 are located above the upper end of the spout opening 34b of the water guide member 34, obstruction by the fixing portions 38 and 40 of the flow of the flush water ejected from the spout opening 34b can be suppressed.

[0099] In addition, according to the flush toilet 1 of the embodiment of the present invention, since the fixing portions 38 and 40 are located below the valve seat 36c of the drain flow path member 36, on which the valve body of the jet drain valve 33 is seated and from which the valve body is unseated, water leakage from the fixing portions 38 and 40 to the outside of the toilet can be reliably prevented.

[0100] According to the flush toilet 1 of the embodiment of the present invention, since the water guide member 34 is provided with the slit portions 38d and 40d for restricting the fixing metal fittings 38c and 40c from rotating together with the fixing screws 38a and 40a when the fixing screws 38a and 40a are rotated, the water guide member 34 can be easily fixed to the toilet main body 2.

[0101] In addition, according to the flush toilet 1 of the embodiment of the present invention, the water guide member 34 is provided with the stopper portions 38e and 40e for retaining the fixing metal fittings 38c and 40c inside the water guide member 34 when the fixing metal fittings 38c and 40c have moved downward to positions below the slit portions 38d and 40d. Thus, when the fixing screws 38a and 40a are rotated in the loosening direction, the fixing metal fittings 38c and 40c appear inside the water guide member 34 and stop, as viewed from above the flush water tank 4. Therefore, a timing for removing the water guide member 34 can be easily determined.

[0102] Note that, in the flush toilet 1 according to the embodiment of the present invention, a case has been described in which the water guide member 34 is provided in the jet water conduit 16. However, the water guide member 34 may be provided in the rim water conduit 12.

[0103] Although the embodiment of the present invention has been described above, various modifications can be made to the above-described embodiment.

Examples

Embodiment Construction

[0044]A flush toilet according to an embodiment of the present invention will be described below with reference to the drawings.

[0045]First, a basic structure of a flush toilet 1 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3.

[0046]FIG. 1 is a plan view of the flush toilet according to the embodiment of the present invention. FIG. 2 is a sectional view taken along line II-II of FIG. 1. FIG. 3 is an exploded perspective view of the flush toilet according to the embodiment of the present invention. In FIGS. 1 and 2, a rim water conduit and a jet water conduit are each indicated by a broken line.

[0047]Note that, in the present specification, when viewed from the front of the flush toilet, the near side is referred to as a front side, the far side is referred to as a rear side, the right side is referred to as a right side, and the left side is referred to as a left side. When viewed from above the flush toilet, the center side of a ...

CROSS REFERENCES TO RELATED APPLICATIONS

[0001] The present invention contains subject matter related to Japanese Patent Application No. 2025-058437 filed in the Japan Patent Office on Mar. 31, 2025, the entire contents of which are incorporated herein by reference.BACKGROUND OF THE INVENTION1. Field of the Invention

[0002] The present invention relates to a flush toilet and, more particularly, to a flush toilet that washes with flush water and discharges waste.2. Description of the Related Art

[0003] In the related art, as described in International Publication No. 2005 / 085538, a siphon jet-type flush toilet is known that induces siphonage by jet water ejection to discharge waste. Such a flush toilet has a jet water spout port that is provided at a lower portion of a bowl portion and that ejects flush water toward an inlet of a drain trap conduit, and a jet water conduit that is connected to a flush water tank and that supplies flush water to the jet water spout port. When flush water is supplied from the flush water tank to the jet water conduit, the flush water flows through the jet water conduit and is ejected from the jet water spout port. The flush water ejected from the jet water spout port flows into the drain trap conduit so as to induce siphonage.

[0004] Here, in the flush toilet described in International Publication No. 2005 / 085538 mentioned above, in order to stably supply flush water to the jet water spout port, for example, it is conceivable to provide a water guide member made of a resin in the jet water conduit and to guide the flush water toward the jet water spout port by the water guide member. Such a water guide member has an advantage in that flush water can be stably supplied to the jet water spout port because manufacturing variations do not occur compared to a ceramic water conduit. In addition, as a method for fixing the water guide member to the toilet main body, it is conceivable to form a fixing hole for fixing the water guide member in the toilet main body and to fix the water guide member to the toilet main body with a bolt or the like. However, forming a fixing hole in the toilet main body poses a problem in that there is a possibility that flush water will leak from the fixing hole and that manufacturing costs in a manufacturing process will increase.SUMMARY OF THE INVENTION

[0005] Accordingly, it is an object of the present invention to provide a flush toilet capable of easily fixing a water guide member to a toilet main body while suppressing the occurrence of water leakage and an increase in manufacturing costs.

[0006] To achieve the above-described object, the present invention provides a flush toilet configured to wash with flush water and to discharge waste, the flush toilet including a toilet main body including a bowl portion configured to receive waste, a spout port provided at the bowl portion and configured to eject flush water, a water conduit configured to guide the flush water to the spout port, and a drain trap conduit connected to a lower portion of the bowl portion and configured to discharge waste; a flush water tank configured to store the flush water to be supplied to the toilet main body, the flush water tank having a drain port configured to discharge the flush water stored in the flush water tank to the toilet main body; a jet drain valve configured to open and close the drain port of the flush water tank; a water guide member provided below the drain port of the flush water tank and configured to guide the flush water from the drain port of the flush water tank to the water conduit; and a fixing portion configured to fix the water guide member to the toilet main body, wherein the fixing portion is provided inside the drain port of the flush water tank.

[0007] According to the present invention configured as described above, since the fixing portion of the water guide member is provided inside the drain port of the flush water tank, it is not necessary to form a fixing hole in the toilet main body. Therefore, the water guide member can be fixed to the toilet main body while suppressing the occurrence of water leakage and an increase in manufacturing costs.

[0008] In the present invention, the fixing portion preferably includes a fastener, a fixing hole portion provided inside the drain port and configured to receive the fastener, and a retainer connected to the fastener and configured to come into contact with a ceiling surface of the toilet main body.

[0009] According to the present invention configured as described above, since the fixing portion includes the fastener, the fixing hole portion provided inside the drain port and configured to receive the fastener, and the retainer connected to the fastener and configured to come into contact with the ceiling surface of the toilet main body, the water guide member can be easily fixed to the toilet main body.

[0010] In the present invention, a spout opening of the water guide member is preferably an opening configured to eject the flush water into the water conduit and is preferably an opening configured to allow the water guide member to be fixed to the toilet main body by the fixing portion.

[0011] According to the present invention configured as described above, since the spout opening of the water guide member is an opening configured to eject the flush water into the water conduit and is an opening configured to allow the water guide member to be fixed to the toilet main body by the fixing portion, the water guide member can be fixed to the toilet main body by using the spout opening of the water guide member.

[0012] In the present invention, the fixing portion is preferably provided at a left end or a right end of the spout opening.

[0013] According to the present invention configured as described above, since the fixing portion is provided at a left end or a right end of the spout opening, obstruction by the fixing portion of the flow of flush water inside the water guide member can be suppressed.

[0014] In the present invention, the water guide member preferably has a fixing opening separate from the spout opening of the water guide member, and the fixing opening is preferably configured to allow the water guide member to be fixed to the toilet main body by the fixing portion.

[0015] According to the present invention configured as described above, since the water guide member has a fixing opening separate from the spout opening of the water guide member, and the fixing opening is configured to allow the water guide member to be fixed to the toilet main body by the fixing portion, the water guide member can be stably fixed to the toilet main body.

[0016] In the present invention, the fixing opening is preferably formed to have a minimum size allowing the retainer of the fixing portion to pass therethrough.

[0017] According to the present invention configured as described above, since the fixing opening is formed to have a minimum size allowing the retainer of the fixing portion to pass therethrough, obstruction by the fixing opening of the flow of flush water inside the water guide member can be suppressed.

[0018] In the present invention, the spout opening is preferably located at a front portion of the water guide member, and the fixing opening is preferably located at a rear portion of the water guide member.

[0019] According to the present invention configured as described above, since the spout opening is located at the front portion of the water guide member, and the fixing opening is located at the rear portion of the water guide member, obstruction by the fixing opening of the flow of flush water inside the water guide member can be further suppressed.

[0020] In the present invention, the fixing portion is preferably located at a position other than a left end and a right end of the drain port of the flush water tank.

[0021] According to the present invention configured as described above, since the fixing portion is located at a position other than the left end and the right end of the drain port of the flush water tank, the width of the water conduit in the lateral direction can be reduced.

[0022] In the present invention, the fixing portion is preferably located at a position above an upper end of a spout opening of the water guide member.

[0023] According to the present invention configured as described above, since the fixing portion is located at a position above the upper end of the spout opening of the water guide member, obstruction by the fixing portion of the flow of flush water ejected from the spout opening can be suppressed.

[0024] In the present invention, the fixing portion is preferably located below a valve seat on which a valve body of the jet drain valve is seated and from which the valve body is unseated.

[0025] According to the present invention configured as described above, since the fixing portion is located below the valve seat on which the valve body of the jet drain valve is seated and from which the valve body is unseated, water leakage from the fixing portion to the outside of the toilet can be reliably prevented.

[0026] In the present invention, the water guide member is preferably provided with a slit portion configured to restrict the retainer from rotating together with the fastener when the fastener is rotated.

[0027] According to the present invention configured as described above, since the water guide member is provided with the slit portion configured to restrict the retainer from rotating together with the fastener when the fastener is rotated, the water guide member can be easily fixed to the toilet main body.

[0028] In the present invention, the water guide member is preferably provided with a stopper portion configured to retain the retainer inside the water guide member when the retainer moves downward to a position below the slit portion.

[0029] According to the present invention configured as described above, since the water guide member is provided with the stopper portion configured to retain the retainer inside the water guide member when the retainer moves downward to a position below the slit portion, when the fastener is rotated in a loosening direction, the retainer appears inside the water guide member and stops as viewed from above the flush water tank. Therefore, a timing for removing the water guide member can be easily determined.

[0030] According to the flush toilet of the present invention, the water guide member can be easily fixed to the toilet main body while suppressing the occurrence of water leakage and an increase in manufacturing costs.BRIEF DESCRIPTION OF THE DRAWINGS

[0031] FIG. 1 is a plan view of a flush toilet according to an embodiment of the present invention.

[0032] FIG. 2 is a sectional view taken along line II-II of FIG. 1.

[0033] FIG. 3 is an exploded perspective view of a flush water tank of the flush toilet according to the embodiment of the present invention.

[0034] FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. 1.

[0035] FIG. 5 is a cross-sectional view taken along line V-V of FIG. 4.

[0036] FIG. 6A is a perspective view of a water guide member of the flush toilet according to the embodiment of the present invention as viewed from below on a front-left side.

[0037] FIG. 6B is a perspective view of the water guide member of the flush toilet according to the embodiment of the present invention as viewed from below on a rear-right side.

[0038] FIG. 7 is a cross-sectional view taken along line VII-VII of FIG. 2.

[0039] FIG. 8 is a plan view of the water guide member of the flush toilet according to the embodiment of the present invention as viewed from above.

[0040] FIG. 9A is a diagram illustrating a procedure for attaching the water guide member of the flush toilet according to the embodiment of the present invention to a toilet main body and is a diagram illustrating a state in which the water guide member is inserted into a jet water conduit.

[0041] FIG. 9B is a diagram illustrating the procedure for attaching the water guide member of the flush toilet according to the embodiment of the present invention to the toilet main body and is a diagram illustrating a state in which a fixing metal fitting of a fixing portion is rotating.

[0042] FIG. 9C is a diagram illustrating the procedure for attaching the water guide member of the flush toilet according to the embodiment of the present invention to the toilet main body and is a diagram illustrating a state in which the fixing metal fitting of the fixing portion is rising.

[0043] FIG. 9D is a diagram illustrating the procedure for attaching the water guide member of the flush toilet according to the embodiment of the present invention to the toilet main body and is a diagram illustrating a state in which attachment of the water guide member is completed.DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0044] A flush toilet according to an embodiment of the present invention will be described below with reference to the drawings.

[0045] First, a basic structure of a flush toilet 1 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3.

[0046] FIG. 1 is a plan view of the flush toilet according to the embodiment of the present invention. FIG. 2 is a sectional view taken along line II-II of FIG. 1. FIG. 3 is an exploded perspective view of the flush toilet according to the embodiment of the present invention. In FIGS. 1 and 2, a rim water conduit and a jet water conduit are each indicated by a broken line.

[0047] Note that, in the present specification, when viewed from the front of the flush toilet, the near side is referred to as a front side, the far side is referred to as a rear side, the right side is referred to as a right side, and the left side is referred to as a left side. When viewed from above the flush toilet, the center side of a toilet is referred to as an inner side, and the outline side of the toilet is referred to as an outer side.

[0048] As illustrated in FIGS. 1 and 2, the flush toilet 1 according to the embodiment of the present invention is a siphon jet-type flush toilet that induces siphonage by jet water ejection to discharge waste.

[0049] As illustrated in FIG. 1, the flush toilet 1 includes a toilet main body 2 and a flush water tank 4 disposed on a rear upper portion of the toilet main body 2. The toilet main body 2 and the flush water tank 4 are integrally made of a ceramic. The flush water tank 4 is provided with a lever handle (not illustrated), and toilet flushing is performed in response to a user operating the lever handle.

[0050] The toilet main body 2 includes a bowl portion 6 that receives waste, a drain trap conduit 8 that is provided at a bottom portion of the bowl portion 6 for discharging waste by siphonage, a rim water spout port 10 that performs rim water ejection, a rim water conduit 12 that supplies flush water to the rim water spout port 10, a jet water spout port 14 that performs jet water ejection, and a jet water conduit 16 that supplies flush water to the jet water spout port 14. The rim water conduit 12 and the jet water conduit 16 are each provided independently. Note that, in the flush toilet 1 according to the embodiment of the present invention, although the rim water conduit 12 and the jet water conduit 16 are each provided independently, they may be constituted by a single common water conduit.

[0051] The bowl portion 6 includes a waste receiving surface 18, a rim portion 20, a shelf surface 22, and a well portion 24. The waste receiving surface 18 is bowl-shaped and receives waste. The rim portion 20 is formed along an upper edge portion of the bowl portion 6 and has an inner peripheral surface 20a that overhangs toward the inside of the bowl portion 6. The shelf surface 22 is formed between the waste receiving surface 18 and the rim portion 20. The well portion 24 is formed below the waste receiving surface 18, and retained water W is formed in the well portion 24. The water level of the retained water W is at an initial water level WL0 in a standby state before the start of flushing.

[0052] The drain trap conduit 8 has an inlet 8a, an ascending conduit 8b that extends upward from the inlet 8a, a descending conduit 8c that extends downward from the ascending conduit 8b, and an apex 8d that is located between the descending conduit 8c and the ascending conduit 8b and that defines the initial water level WL0 of the retained water W. A lower end of the descending conduit 8c of the drain trap conduit 8 is connected to a drain pipe (not illustrated) on a building side via a drain socket (not illustrated).

[0053] The rim water spout port 10 is formed at the rim portion 20 and is located on the right side of the bowl portion 6 and in the vicinity of the center of the bowl portion 6 in the front-rear direction. The rim water spout port 10 is formed so as to be open forward. Flush water ejected from the rim water spout port 10 swirls clockwise on the shelf surface 22 along the inner peripheral surface 20a of the rim portion 20. The flush water swirls on the shelf surface 22 in this manner, so that the flush water flows down from the shelf surface 22 to the waste receiving surface 18 to wash the waste receiving surface 18. Note that, in the flush toilet 1 according to the embodiment of the present invention, although only the single rim water spout port 10 is provided, two or more rim water spout ports may be provided.

[0054] The rim water conduit 12 has an upstream end that is connected to a rim drain port 4b formed in a bottom surface portion 4a of the flush water tank 4, and a downstream end that is connected to the rim water spout port 10. When viewed in plan view, the rim water conduit 12 extends substantially linearly forward from the rim drain port 4b of the flush water tank 4 (see FIG. 1). Flush water is supplied from the flush water tank 4 to the rim water conduit 12, and the flush water is ejected from the rim water spout port 10 by a head pressure of the flush water stored in the flush water tank 4. Note that, in the flush toilet 1 according to the embodiment of the present invention, although flush water from the flush water tank 4 is supplied to the rim water conduit 12, the rim water conduit 12 may be directly connected to a water supply source such as a water supply system, and flush water from the water supply source, such as a water supply system, may be directly supplied to the rim water conduit 12.

[0055] The jet water spout port 14 is formed at the bottom portion of the bowl portion 6. The jet water spout port 14 is disposed so as to face the inlet 8a of the drain trap conduit 8 and directed toward the inlet 8a of the drain trap conduit 8. Flush water is ejected from the jet water spout port 14 toward the inlet 8a of the drain trap conduit 8 so as to induce siphonage at an early stage.

[0056] The jet water conduit 16 has an upstream end that is connected to a jet drain port 4c formed in the bottom surface portion 4a of the flush water tank 4, and a downstream end that is connected to the jet water spout port 14. The jet water conduit 16 includes a main water conduit 16a, a left curved flow path 16b, a right curved flow path 16c, and an outlet flow path 16d. The main water conduit 16a extends linearly forward from the jet drain port 4c of the flush water tank 4. The left curved flow path 16b branches from a downstream end of the main water conduit 16a, curves to the left side, and extends forward. The right curved flow path 16c branches from the downstream end of the main water conduit 16a, curves to the right side, and extends forward. The outlet flow path 16d extends linearly rearward and is connected to the jet water spout port 14, and a downstream end of the left curved flow path 16b and a downstream end of the right curved flow path 16c merge at the outlet flow path 16d (see FIG. 1). The flush water is supplied from the flush water tank 4 to the jet water conduit 16, and the flush water is ejected from the jet water spout port 14 by a head pressure of the flush water stored in the flush water tank 4. Note that, in the flush toilet 1 according to the embodiment of the present invention, although flush water from the flush water tank 4 is supplied to the jet water conduit 16, the jet water conduit 16 may be directly connected to a water supply source such as a water supply system, and flush water from the water supply source, such as a water supply system, may be directly supplied to the jet water conduit 16.

[0057] The flush water tank 4 is a tank that stores flush water supplied from a water supply source (not illustrated) such as a water supply system. In addition, the flush water tank 4 is a gravity-fed tank that supplies the stored flush water to the toilet main body 2 by using gravity. The flush water tank 4 includes an outer tank 26 that is made of a ceramic and an inner tank 28 that is made of a resin and disposed inside the outer tank 26. A jet drain port 26b and a rim drain port 26c are provided at a bottom surface portion 26a of the outer tank 26. In addition, a jet drain port 28b is provided in a bottom surface portion 28a of the inner tank 28. Note that, in the flush toilet 1 according to the embodiment of the present invention, although the flush water tank 4 includes the outer tank 26 and the inner tank 28, the flush water tank 4 may include only the outer tank 26 without the inner tank 28 or may include only the inner tank 28 without the outer tank 26.

[0058] The flush water stored in the outer tank 26 (and outside the inner tank 28) flows into the rim water conduit 12 through the rim drain port 26c of the outer tank 26. In addition, flush water stored in the inner tank 28 flows into the jet water conduit 16 through the jet drain port 28b of the inner tank 28 and through the jet drain port 26b of the outer tank 26. Note that, in the flush toilet 1 according to the embodiment of the present invention, although the rim drain port 4b and the jet drain port 4c are provided separately from each other, the rim drain port 4b and the jet drain port 4c may be constituted by a single drain port.

[0059] An outer wall portion 30 that extends upward in the vertical direction from the outer periphery of the jet drain port 28b is formed on the bottom surface portion 28a of the inner tank 28. The outer wall portion 30 is formed integrally with the inner tank 28. The outer wall portion 30 is formed in a cylindrical shape and disposed so as to surround the jet drain port 28b. An overflow pipe 32 is integrally formed on the outer wall portion 30 on a front-right side. The overflow pipe 32 is formed so as to extend in the horizontal direction from the outer wall portion 30, bend at a right angle, and then extend upward in the vertical direction. An upper end of the overflow pipe 32 is open to the atmosphere, and the overflow pipe 32 is configured to drain overflowed flush water in the flush water tank 4 into the toilet main body 2. In addition, an overflow cap 31 is attached to the upper end of the overflow pipe 32 so that foreign matter or the like does not flow into the overflow pipe 32.

[0060] A water guide member 34 that extends downward in the vertical direction from the jet drain port 28b is provided at the bottom surface portion 28a of the inner tank 28. The water guide member 34 is made of a resin material and formed integrally with the inner tank 28 (see FIG. 3). When the inner tank 28 is attached to the outer tank 26, the water guide member 34 is disposed inside the jet water conduit 16. In addition, a drain flow path for guiding flush water that has flowed into the water guide member 34 to the jet water conduit 16 is formed inside the water guide member 34. Note that, in the flush toilet 1 according to the embodiment of the present invention, although the water guide member 34 is integrated with the inner tank 28, the water guide member 34 may be provided separately from the inner tank 28.

[0061] A seal member 35 that seals between a jet drain valve 33 and the toilet main body 2 in a watertight manner is provided therebetween. Specifically, the seal member 35 is provided on the outer peripheral surface of the jet drain port 28b of the inner tank 28 and seals between the inner tank 28 and the toilet main body 2 in a watertight manner. The seal member 35 is a ring-shaped rubber packing member. Note that, in the embodiment of the present invention, although the seal member 35 is provided on the outer peripheral surface of the jet drain port 28b of the inner tank 28, the seal member 35 may be provided at the jet drain valve 33 or at the water guide member 34.

[0062] The jet drain valve 33 is provided at the jet drain port 28b of the inner tank 28. The jet drain valve 33 includes a drain flow path member 36 forming a drain flow path, a valve body (not illustrated) that opens and closes a drain port 36a of the drain flow path member 36, and a drive mechanism (not illustrated) that drives the valve body in response to a user operating the lever handle.

[0063] The drain flow path member 36 is made of a resin material and includes an inner wall portion 36b, a valve seat 36c, and a communication port 36d. The inner wall portion 36b forms the drain flow path. The valve seat 36c protrudes upward from an upper surface of the inner wall portion 36b, and the valve body is seated on or unseated from the valve seat 36c. The communication port 36d allows the flush water in the inner tank 28 to flow into the drain flow path of the inner wall portion 36b. The inner wall portion 36b of the drain flow path member 36 is formed in a cylindrical shape and extends downward in the vertical direction through the inside of the jet drain port 28b and through the inside of the water guide member 34.

[0064] The valve body of the jet drain valve 33 is configured to move up and down in the vertical direction to open and close the drain port 36a of the drain flow path member 36. The drive mechanism is, for example, a water-pressure drive mechanism that is driven by a water supply pressure of flush water supplied from the water supply source. The drive mechanism is configured such that, when a user operates the lever handle, the water supply pressure of the flush water acts to pull up the valve body of the jet drain valve 33, and after a predetermined time has elapsed, the water supply pressure of the flush water stops acting, causing the valve body of the jet drain valve 33 to descend.

[0065] A rim drain valve device (not illustrated) is provided at the rim drain port 26c of the outer tank 26. The rim drain valve device is disposed above the rim drain port 26c and configured such that a valve body thereof moves up and down in the vertical direction in response to a user operating the lever handle to open and close the rim drain port 4b.

[0066] A water supply valve device (not illustrated) for supplying flush water is provided inside the outer tank 26 (and outside the inner tank 28). The water supply valve device is configured to switch between supplying and stopping flush water to the outer tank 26 and the inner tank 28. The water supply valve device includes a float (not illustrated) that opens and closes a valve body in accordance with the water level in the outer tank 26, and is configured to open the valve body when the water level in the outer tank 26 drops below a full water level and to close the valve body when the water level in the outer tank 26 reaches the full water level.

[0067] Next, the water guide member 34 of the flush toilet 1 according to the embodiment of the present invention will be described in detail with reference to FIG. 2 and FIGS. 4 to 8.

[0068] FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. 1. FIG. 5 is a cross-sectional view taken along line V-V of FIG. 4. FIG. 6A is a perspective view of the water guide member of the flush toilet according to the embodiment of the present invention as viewed from below on a front-left side. FIG. 6B is a perspective view of the water guide member of the flush toilet according to the embodiment of the present invention as viewed from below on a rear-right side. FIG. 7 is a cross-sectional view taken along line VII-VII of FIG. 2. FIG. 8 is a plan view of the water guide member of the flush toilet according to the embodiment of the present invention as viewed from above.

[0069] As illustrated in FIG. 2, the water guide member 34 is a member for guiding the flush water discharged from the jet drain port 4c of the flush water tank 4 to the jet water conduit 16 while rectifying the flush water. The water guide member 34 is made of a resin material and extends from the jet drain port 4c into the jet water conduit 16. Thus, the flush water discharged from the jet drain port 4c of the flush water tank 4 can be prevented from colliding with a bottom surface portion 16e of the jet water conduit 16, thereby avoiding generation of turbulence, and the flush water can flow while being rectified.

[0070] The water guide member 34 includes a vertically extending wall portion 34a, a spout opening 34b, and a receiving surface portion 34c that are arranged in this order from the upstream side. The vertically extending wall portion 34a extends downward in the vertical direction from the jet drain port 28b of the inner tank 28. The spout opening 34b is formed in a front portion of the vertically extending wall portion 34a. The receiving surface portion 34c is bent and extends forward from the lower end of a rear portion of the vertically extending wall portion 34a. In addition, an inclined surface portion 34d is provided at a rear portion of the receiving surface portion 34c. The inclined surface portion 34d is set such that an inclination angle at which the inclined surface portion 34d is inclined downward with respect to the horizontal direction is larger than that of a front portion of the receiving surface portion 34c.

[0071] The vertically extending wall portion 34a of the water guide member 34 is formed in a cylindrical shape and extends through the jet drain port 26b of the outer tank 26 to be inserted into the jet water conduit 16. The lower end of the vertically extending wall portion 34a is located below an upper surface portion 16f of the jet water conduit 16.

[0072] The spout opening 34b of the water guide member 34 is open laterally toward the front. In addition, the spout opening 34b is formed so as to be open in a flow direction of the flush water flowing through the jet water conduit 16. Furthermore, the spout opening 34b is formed in a substantially rectangular shape that is flat and long in the lateral direction when viewed from the front. The upper end of the spout opening 34b is located below the upper surface portion 16f of the jet water conduit 16, and the lower end of the spout opening 34b is located above the bottom surface portion 16e of the jet water conduit 16. The flush water that has flowed into the water guide member 34 is ejected from the spout opening 34b into the jet water conduit 16.

[0073] The receiving surface portion 34c of the water guide member 34 is disposed in an entire region into which the drain port 36a of the drain flow path member 36 is projected downward in the vertical direction. In other words, the receiving surface portion 34c is configured to receive all the flush water discharged from the drain port 36a of the drain flow path member 36. The receiving surface portion 34c is disposed so as to form a gap between the receiving surface portion 34c and the bottom surface portion 16e of the jet water conduit 16 and disposed so as not to come into contact with the bottom surface portion 16e of the jet water conduit 16. The receiving surface portion 34c is formed so as to be substantially parallel to the bottom surface portion 16e of the jet water conduit 16.

[0074] As illustrated in FIG. 4, the water guide member 34 includes two fixing portions 38 and 40 for fixing the water guide member 34 to the toilet main body 2. The fixing portion 38 includes a fixing screw (fastener) 38a, a fixing hole portion 38b, a fixing metal fitting (retainer) 38c, a slit portion 38d, and a stopper portion 38e. The fixing screw 38a is inserted into the fixing hole portion 38b. The fixing metal fitting 38c comes into contact with a ceiling surface of the toilet main body 2. The slit portion 38d is provided in order to restrict the fixing metal fitting 38c from rotating together with the fixing screw 38a when the fixing screw 38a is rotated. The stopper portion 38e is provided in order to retain the fixing metal fitting 38c inside the jet drain port 4c of the flush water tank 4 when the fixing metal fitting 38c moves downward below the slit portion 38d. The fixing portion 40 includes a fixing screw (fastener) 40a, a fixing hole portion 40b, a fixing metal fitting (retainer) 40c, a slit portion 40d, and a stopper portion 40e. The fixing screw 40a is inserted into the fixing hole portion 40b. The fixing metal fitting 40c comes into contact with the ceiling surface of the toilet main body 2. The slit portion 40d is provided in order to restrict the fixing metal fitting 40c from rotating together with the fixing screw 40a when the fixing screw 40a is rotated. The stopper portion 40e is provided in order to retain the fixing metal fitting 40c inside the jet drain port 4c of the flush water tank 4 when the fixing metal fitting 40c moves downward below the slit portion 40d.

[0075] As illustrated in FIG. 5, each of the fixing hole portions 38b and 40b is provided inside the jet drain port 4c of the flush water tank 4 (the jet drain port 26b of the outer tank 26). Each of the fixing hole portions 38b and 40b is formed so as to protrude from an inner peripheral surface of the vertically extending wall portion 34a of the water guide member 34 into the drain flow path through which the flush water flows. The fixing hole portion 38b is located on the front-left side of the water guide member 34, and the fixing hole portion 40b is located on the rear-right side of the water guide member 34. Each of the fixing hole portions 38b and 40b is disposed on a center line CL1 passing through a center O of the jet drain port 4c of the flush water tank 4.

[0076] Each of the fixing screws 38a and 40a includes a head portion and a screw portion that extends downward in the vertical direction from the head portion and on which an external thread is formed. The fixing screw 38a is inserted into the fixing hole portion 38b from above such that the head portion comes into contact with an upper surface of the fixing hole portion 38b and such that the screw portion extends through the fixing hole portion 38b. The fixing screw 40a is inserted into the fixing hole portion 40b from above such that the head portion comes into contact with an upper surface of the fixing hole portion 40b and such that the screw portion extends through the fixing hole portion 40b.

[0077] Each of the fixing metal fittings 38c and 40c includes a main body portion that is made of a metal and formed in a rectangular parallelepiped shape and a through-hole that is formed at one end of the main body portion and in which an internal thread is formed. The screw portions of the fixing screws 38a and 40a are respectively screwed into the through-holes of the fixing metal fittings 38c and 40c. When the fixing screws 38a and 40a are rotated in a tightening direction, the fixing metal fittings 38c and 40c move upward along the respective screw portions, and upper surfaces of the fixing metal fittings 38c and 40c come into contact with the ceiling surface of the toilet main body 2. Consequently, the toilet main body 2 is sandwiched between the bottom surface portion 28a of the inner tank 28 and the fixing metal fittings 38c and 40c, and the water guide member 34 is fixed to the toilet main body 2. On the other hand, when the fixing screws 38a and 40a are rotated in a loosening direction, the fixing metal fittings 38c and 40c move downward along the respective screw portions, and the upper surfaces of the fixing metal fittings 38c and 40c move away from the ceiling surface of the toilet main body 2.

[0078] As illustrated in FIG. 6A, the fixing portion 38 is provided at the left end of the spout opening 34b, which is located at the front of the water guide member 34. In addition, the fixing portion 38 is provided above the upper end of the spout opening 34b (see FIG. 4). Furthermore, the fixing portion 38 is located below the valve seat 36c on which the valve body of the jet drain valve 33 is seated and from which the valve body is unseated (see FIG. 4).

[0079] The slit portion 38d of the fixing portion 38 is formed of a recessed slit (groove) having a size that allows the fixing metal fitting 38c to pass therethrough, and extends upward in the vertical direction from an upper-left corner of the spout opening 34b. When the fixing metal fitting 38c is inserted into the slit portion 38d, rotation of the fixing metal fitting 38c is restricted by an inner side surface of the slit portion 38d such that the fixing metal fitting 38c does not rotate together with the fixing screw 38a. The stopper portion 38e is provided at the left end of the spout opening 34b below the slit portion 38d. The stopper portion 38e is a left end portion of the spout opening 34b. After the fixing screw 38a has been rotated in the loosening direction and the fixing metal fitting 38c has moved downward to a position below the slit portion 38d, the stopper portion 38e restricts rotation of the fixing metal fitting 38c and retains the fixing metal fitting 38c inside the water guide member 34.

[0080] As illustrated in FIG. 6B, a fixing opening 42 for fixing the water guide member 34 to the toilet main body 2 by using the fixing portion 40 is provided in a rear portion of the water guide member 34 separately from the spout opening 34b. The fixing opening 42 is formed in a flat shape that is long in the lateral direction, and is formed to have a minimum size that allows the fixing metal fitting 40c of the fixing portion 40 to pass therethrough (a size slightly larger than that of a side surface of the fixing metal fitting 40c). The fixing portion 40 is located at the right end of the fixing opening 42. In addition, the fixing portion 40 is located above the upper end of the spout opening 34b (see FIG. 4). Furthermore, the fixing portion 40 is located below the valve seat 36c, on which the valve body of the jet drain valve 33 is seated and from which the valve body is unseated (see FIG. 4).

[0081] The slit portion 40d of the fixing portion 40 is formed of a recessed slit (groove) having a size that allows the fixing metal fitting 40c to pass therethrough, and extends upward in the vertical direction from an upper-right corner of the fixing opening 42. When the fixing metal fitting 40c is inserted into the slit portion 40d, rotation of the fixing metal fitting 40c is restricted by an inner side surface of the slit portion 40d such that the fixing metal fitting 40c does not rotate together with the fixing screw 40a. The stopper portion 40e is provided at the right end of the fixing opening 42 below the slit portion 40d. The stopper portion 40e is a right end portion of the fixing opening 42. After the fixing screw 40a has been rotated in the loosening direction and the fixing metal fitting 40c has moved downward to a position below the slit portion 40d, the stopper portion 40e restricts rotation of the fixing metal fitting 40c and retains the fixing metal fitting 40c inside the water guide member 34.

[0082] As illustrated in FIG. 7, the fixing portions 38 and 40 are located at positions other than the left end and the right end of the jet drain port 4c of the flush water tank 4 (see the dotted line in FIG. 7). Specifically, the fixing portions 38 and 40 are not located on a center line CL2 that bisects the jet drain port 4c of the flush water tank 4 in the front-rear direction. The fixing portion 38 is located forward of the center line CL2 of the jet drain port 4c of the flush water tank 4, and the fixing portion 40 is located rearward of the center line CL2 of the jet drain port 4c of the flush water tank 4. Consequently, a width of the jet water conduit 16 in the lateral direction can be reduced compared with the case where the fixing portions 38 and 40 are located at the left end and the right end (on the center line CL2) of the jet drain port 4c.

[0083] As illustrated in FIG. 8, the fixing metal fittings 38c and 40c of the fixing portions 38 and 40 are retained inside the jet drain port 4c of the flush water tank 4 (see the dotted line in FIG. 8) in a state of being in contact with the stopper portions 38e and 40e, respectively. In other words, the fixing metal fittings 38c and 40c are retained at positions visible from the jet drain port 28b of the inner tank 28. Thus, during removal of the inner tank 28 and the water guide member 34 from the outer tank 26, when the fixing screws 38a and 40a are rotated in the loosening direction, the fixing metal fittings 38c and 40c appear inside the water guide member 34 and stop, as viewed from above the flush water tank 4. Therefore, a timing for removing the water guide member 34 can be easily determined.

[0084] Next, a procedure for attaching the water guide member 34 to the toilet main body 2 in the flush toilet 1 according to the embodiment of the present invention will be described with reference to FIGS. 9A to 9D.

[0085] FIGS. 9A to 9D are diagrams illustrating the procedure for attaching the water guide member to the toilet main body in the flush toilet according to the embodiment of the present invention. FIG. 9A is a diagram illustrating a state in which the water guide member is inserted into the jet water conduit. FIG. 9B is a diagram illustrating a state in which the fixing metal fittings of the fixing portions are rotating. FIG. 9C is a diagram illustrating a state in which each of the fixing metal fittings of the fixing portion is rising. FIG. 9D is a diagram illustrating a state in which attachment of the water guide member is completed.

[0086] First, as illustrated in FIG. 9A, the fixing screws 38a and 40a extend through the respective fixing hole portions 38b and 40b, and the fixing metal fittings 38c and 40c are connected to lower ends of the respective fixing screws 38a and 40a. In addition, the fixing metal fittings 38c and 40c are located inside the water guide member 34. In a state where the fixing metal fittings 38c and 40c are located inside the water guide member 34, the water guide member 34 is inserted into the jet water conduit 16 through the jet drain port 4c of the flush water tank 4.

[0087] Next, as illustrated in FIG. 9B, when the fixing screw 38a is rotated in the tightening direction, the fixing metal fitting 38c rotates through the spout opening 34b and comes into contact with the left end of the spout opening 34b. At this time, the fixing metal fitting 38c protrudes to the outside of the water guide member 34. In addition, when the fixing screw 40a is rotated in the tightening direction, the fixing metal fitting 40c rotates through the fixing opening 42 and comes into contact with the left end of the fixing opening 42. At this time, the fixing metal fitting 40c protrudes to the outside of the water guide member 34.

[0088] In addition, as illustrated in FIG. 9C, when the fixing screw 38a is rotated in the tightening direction, rotation of the fixing metal fitting 38c is restricted by the left end of the spout opening 34b, and the fixing metal fitting 38c moves upward. When the fixing screw 38a is further rotated in the tightening direction, rotation of the fixing metal fitting 38c is restricted by the inner side surface of the slit portion 38d, and the fixing metal fitting 38c moves upward along the slit portion 38d. Thus, the fixing metal fitting 38c does not rotate together with the fixing screw 38a. Similarly, when the fixing screw 40a is rotated in the tightening direction, the fixing metal fitting 40c moves upward along the slit portion 40d.

[0089] Finally, as illustrated in FIG. 9D, when the fixing metal fittings 38c and 40c come into contact with the ceiling surface of the toilet main body 2, the toilet main body 2 is sandwiched between the bottom surface portion 28a of the inner tank 28 and the fixing metal fittings 38c and 40c, and the water guide member 34 is fixed to the toilet main body 2. Thus, attachment of the water guide member 34 to the toilet main body 2 is completed.

[0090] Operational effects according to the above-described embodiment of the present invention will be described below. First, according to the flush toilet 1 of the embodiment of the present invention, since the fixing portions 38 and 40 of the water guide member 34 are provided inside the jet drain port 4c of the flush water tank 4, it is not necessary to form a fixing hole in the toilet main body 2. Therefore, the water guide member 34 can be fixed to the toilet main body 2 while suppressing the occurrence of water leakage and an increase in manufacturing costs.

[0091] In addition, according to the flush toilet 1 of the embodiment of the present invention, the fixing portion 38 includes the fixing screw 38a, the fixing hole portion 38b, which is provided inside the jet drain port 4c of the flush water tank 4 and into which the fixing screw 38a is inserted, and the fixing metal fitting 38c, which is connected to the fixing screw 38a and which comes into contact with the ceiling surface of the toilet main body 2. The fixing portion 40 includes the fixing screw 40a, the fixing hole portion 40b, which is provided inside the jet drain port 4c of the flush water tank 4 and into which the fixing screw 40a is inserted, and the fixing metal fitting 40c, which is connected to the fixing screw 40a and which comes into contact with the ceiling surface of the toilet main body 2. Therefore, the water guide member 34 can be easily fixed to the toilet main body 2.

[0092] According to the flush toilet 1 of the embodiment of the present invention, the spout opening 34b of the water guide member 34 is an opening for ejecting flush water into the jet water conduit 16 and is an opening for fixing the water guide member 34 to the toilet main body 2 by using the fixing portion 38. Therefore, the water guide member 34 can be fixed to the toilet main body 2 by using the spout opening 34b of the water guide member 34.

[0093] In addition, according to the flush toilet 1 of the embodiment of the present invention, since the fixing portion 38 is provided at the left end (or the right end) of the spout opening 34b, obstruction by the fixing portion 38 of the flow of the flush water inside the water guide member 34 can be suppressed.

[0094] According to the flush toilet 1 of the embodiment of the present invention, since the fixing opening 42 for fixing the water guide member 34 to the toilet main body 2 by using the fixing portion 40 is provided in the water guide member 34 separately from the spout opening 34b of the water guide member 34, the water guide member 34 can be stably fixed to the toilet main body 2.

[0095] In addition, according to the flush toilet 1 of the embodiment of the present invention, since the fixing opening 42 is formed to have a minimum size that allows the fixing metal fitting 40c of the fixing portion 40 to pass therethrough, obstruction by the fixing opening 42 of the flow of the flush water inside the water guide member 34 can be suppressed.

[0096] According to the flush toilet 1 of the embodiment of the present invention, the spout opening 34b is located at the front of the water guide member 34, and the fixing opening 42 is located at the rear of the water guide member 34. Thus, obstruction by the fixing opening 42 of the flow of the flush water inside the water guide member 34 can be further suppressed.

[0097] In addition, according to the flush toilet 1 of the embodiment of the present invention, since the fixing portions 38 and 40 are located at positions other than the left end and the right end of the jet drain port 4c of the flush water tank 4, the width of the jet water conduit 16 in the lateral direction can be reduced.

[0098] According to the flush toilet 1 of the embodiment of the present invention, since the fixing portions 38 and 40 are located above the upper end of the spout opening 34b of the water guide member 34, obstruction by the fixing portions 38 and 40 of the flow of the flush water ejected from the spout opening 34b can be suppressed.

[0099] In addition, according to the flush toilet 1 of the embodiment of the present invention, since the fixing portions 38 and 40 are located below the valve seat 36c of the drain flow path member 36, on which the valve body of the jet drain valve 33 is seated and from which the valve body is unseated, water leakage from the fixing portions 38 and 40 to the outside of the toilet can be reliably prevented.

[0100] According to the flush toilet 1 of the embodiment of the present invention, since the water guide member 34 is provided with the slit portions 38d and 40d for restricting the fixing metal fittings 38c and 40c from rotating together with the fixing screws 38a and 40a when the fixing screws 38a and 40a are rotated, the water guide member 34 can be easily fixed to the toilet main body 2.

[0101] In addition, according to the flush toilet 1 of the embodiment of the present invention, the water guide member 34 is provided with the stopper portions 38e and 40e for retaining the fixing metal fittings 38c and 40c inside the water guide member 34 when the fixing metal fittings 38c and 40c have moved downward to positions below the slit portions 38d and 40d. Thus, when the fixing screws 38a and 40a are rotated in the loosening direction, the fixing metal fittings 38c and 40c appear inside the water guide member 34 and stop, as viewed from above the flush water tank 4. Therefore, a timing for removing the water guide member 34 can be easily determined.

[0102] Note that, in the flush toilet 1 according to the embodiment of the present invention, a case has been described in which the water guide member 34 is provided in the jet water conduit 16. However, the water guide member 34 may be provided in the rim water conduit 12.

[0103] Although the embodiment of the present invention has been described above, various modifications can be made to the above-described embodiment.

Examples

Embodiment Construction

[0044]A flush toilet according to an embodiment of the present invention will be described below with reference to the drawings.

[0045]First, a basic structure of a flush toilet 1 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3.

[0046]FIG. 1 is a plan view of the flush toilet according to the embodiment of the present invention. FIG. 2 is a sectional view taken along line II-II of FIG. 1. FIG. 3 is an exploded perspective view of the flush toilet according to the embodiment of the present invention. In FIGS. 1 and 2, a rim water conduit and a jet water conduit are each indicated by a broken line.

[0047]Note that, in the present specification, when viewed from the front of the flush toilet, the near side is referred to as a front side, the far side is referred to as a rear side, the right side is referred to as a right side, and the left side is referred to as a left side. When viewed from above the flush toilet, the center side of a ...

Claims

1. A flush toilet configured to wash with flush water and to discharge waste, the flush toilet comprising:a toilet main body including a bowl portion configured to receive waste, a spout port provided at the bowl portion and configured to eject flush water, a water conduit configured to guide the flush water to the spout port, and a drain trap conduit connected to a lower portion of the bowl portion and configured to discharge waste;a flush water tank configured to store the flush water to be supplied to the toilet main body, the flush water tank having a drain port configured to discharge the flush water stored in the flush water tank to the toilet main body;a jet drain valve configured to open and close the drain port of the flush water tank;a water guide member provided below the drain port of the flush water tank and configured to guide the flush water from the drain port of the flush water tank to the water conduit; anda fixing portion configured to fix the water guide member to the toilet main body,wherein the fixing portion is provided inside the drain port of the flush water tank.

2. The flush toilet according to claim 1,wherein the fixing portion includes a fastener, a fixing hole portion provided inside the drain port and configured to receive the fastener, and a retainer connected to the fastener and configured to come into contact with a ceiling surface of the toilet main body.

3. The flush toilet according to claim 2,wherein a spout opening of the water guide member is an opening configured to eject the flush water into the water conduit and is an opening configured to allow the water guide member to be fixed to the toilet main body by the fixing portion.

4. The flush toilet according to claim 3,wherein the fixing portion is provided at a left end or a right end of the spout opening.

5. The flush toilet according to claim 3,wherein the water guide member has a fixing opening separate from the spout opening of the water guide member, the fixing opening being configured to allow the water guide member to be fixed to the toilet main body by the fixing portion.

6. The flush toilet according to claim 5,wherein the fixing opening is formed to have a minimum size allowing the retainer of the fixing portion to pass therethrough.

7. The flush toilet according to claim 5,wherein the spout opening is located at a front portion of the water guide member, and the fixing opening is located at a rear portion of the water guide member.

8. The flush toilet according to claim 5,wherein the fixing portion is located at a position other than a left end and a right end of the drain port of the flush water tank.

9. The flush toilet according to claim 1,wherein the fixing portion is located at a position above an upper end of a spout opening of the water guide member.

10. The flush toilet according to claim 1,wherein the fixing portion is located below a valve seat on which a valve body of the jet drain valve is seated and from which the valve body is unseated.

11. The flush toilet according to claim 2,wherein the water guide member is provided with a slit portion configured to restrict the retainer from rotating together with the fastener when the fastener is rotated.

12. The flush toilet according to claim 11,wherein the water guide member is provided with a stopper portion configured to retain the retainer inside the water guide member when the retainer moves downward to a position below the slit portion.

Images