Water-washing toilet device

Abstract

To provide a flush toilet device that does not require a mounting base plate to be interposed between the flush water tank and the toilet body, nor does it require a reinforcing plate to be provided on the inside of the flush water tank. [Solution] The present invention is a flush toilet device that performs cleaning with cleaning water stored in a cleaning water tank, comprising: a flush toilet body having a bowl portion and a drain trap pipe extending from the lower part of the bowl portion; and a cleaning water tank disposed on the rear side of the flush toilet body and storing cleaning water for cleaning the bowl portion of the flush toilet body, wherein the drain port of the cleaning water tank and the cleaning water supply port of the flush toilet body are connected, the bottom surface of the cleaning water tank is directly in contact with and supported by the upper surface of the flush toilet body, and the bottom surface of the cleaning water tank and the upper surface of the flush toilet body are in contact with and supported at only three locations away from the connection between the drain port and the cleaning water supply port.

Description

[[TECHNICAL FIELD]]

[0001] The present invention relates to a flush toilet apparatus, and particularly to a flush toilet apparatus that performs flushing using flushing water stored in a flushing water tank. [[BACKGROUND ART]]

[0002] In a conventional general tank-type flush toilet apparatus, a reinforcing plate called a mounting base plate is first attached to the upper surface of a flush toilet body, and the bottom surface of a flushing water tank is placed (seated) on the upper surface of the mounting base plate.

[0003] Specifically, first, a nut 111 having an uneven structure for air release as shown in Fig. 11 is prepared, and in a state where a known annular tight coupling packing 9 (see Fig. 8 described later) is fitted onto the outer circumference of the nut 111, the nut 111 is fitted into a flushing water supply port 121 opened on the upper surface of the flush toilet body. Then, as shown in Fig. 12, a mounting base plate 112 is set on the nut 111 and the tight coupling packing 9.

[0004] At this time, a mounting bolt 107 that is fitted into the mounting base plate 112 or the like is passed through a corresponding bolt hole 127 provided in an upper surface forming wall of the flush toilet body, and a resin nut 108 is tightened from below the upper surface forming wall, so that the mounting base plate 132 and the upper surface forming wall of the flush toilet body are tightened (fastened) between the resin nut 108 and a head 107h of the mounting bolt 107.

[0005] Then, a flushing water tank 106 as shown in Fig. 13 is set on the mounting base plate 132 fastened in this manner, that is, the flushing water tank 106 is placed in a well-balanced manner by four seating protrusions 162, and a drain port 161 of the flushing water tank 106 is fitted into the nut 111, so that the flushing water tank 106 is connected to the flushing water supply port 121 of the flush toilet body.

[0006] In a different configuration, as shown in Figures 14 and 15 (corresponding to Figures 7 and 8 of Patent Document 1), a reinforcing metal plate 131 is provided on the inner surface of the outer tank T (outside relative to the tank body 122), and the outer tank T is fastened to the toilet body 104 by screws 159. In this configuration as well, the tank T is supported on the toilet body 101 by four points: two fastening points by screws 159 and two tank legs 125. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Japanese Patent Publication No. 2022-85787 [Overview of the project] [Problems that the invention aims to solve]

[0008] The inventor of this case has been diligently investigating the feasibility of adopting a configuration that eliminates the need for a mounting board between the flushing water tank and the toilet body, while working on the development of a low-profile (lower height) flush toilet device. This is because omitting the mounting board would allow for a lower profile design.

[0009] On the other hand, an embodiment that provides a reinforcing plate on the inside of the tank, such as the structure disclosed in Patent Document 1, has the problem of complicating the manufacturing process.

[0010] The present invention was conceived based on the above findings. The object of the present invention is to provide a flush toilet device that does not require a mounting base plate to be interposed between the flush water tank and the flush toilet body, nor does it require a reinforcing plate to be provided on the inside of the flush water tank. [Means for solving the problem]

[0011] The present invention relates to a flush toilet device that performs flushing using flushing water stored in a flushing water tank, comprising: a flush toilet body having a bowl portion and a drain trap pipe extending from the lower part of the bowl portion; and a flushing water tank positioned on the rear side of the flush toilet body and storing flushing water for flushing the bowl portion of the flush toilet body, wherein the drain port of the flushing water tank is connected to the flushing water supply port of the flush toilet body, the bottom surface of the flushing water tank is directly supported in contact with the top surface of the flush toilet body, and the bottom surface of the flushing water tank and the top surface of the flush toilet body are supported in contact at only three locations away from the connection between the drain port and the flushing water supply port.

[0012] According to the inventor's findings, the upper surface of a flush toilet body may have slight "warping," and it has been confirmed that when the bottom surface of the flush water tank is directly supported on the upper surface of such a flush toilet body, adopting a three-point support system instead of the conventional four-point support system is extremely effective in improving the stability of the mounted (fixed) state.

[0013] In other words, according to the present invention, in the configuration in which the bottom surface of the flushing water tank is directly supported on the upper surface of the toilet bowl body, the stability of the mounted (fixed) state can be increased by adopting a three-point support instead of the conventional four-point support.

[0014] In the present invention, the connecting portion is located on a virtual left-right center line extending in the front-rear direction of the toilet bowl body, and it is preferable that two of the three locations are arranged symmetrically with respect to the center line.

[0015] This allows for better balance in supporting the bottom of the washing water tank.

[0016] Furthermore, in this case, it is even more preferable that the two locations are arranged so as to sandwich the connecting portion in the left-right direction.

[0017] According to this configuration, the bottom surface of the flush water tank can be supported with a better balance relative to the connecting portion.

[0018] Further, in this case, it is more preferable that the remaining one of the three positions is arranged on the center line in a plan view.

[0019] According to this configuration, the bottom surface of the flush water tank can be supported with an even better balance relative to the connecting portion.

[0020] Further, in the present invention, it is preferable that the bottom surface of the flush water tank has a protrusion protruding downward at each of the three positions.

[0021] According to this configuration, "three-point support" can be easily realized. In this case, the corresponding portion of the flush toilet body may also protrude. However, at least as of the filing date of the present application, an embodiment in which only the corresponding portion of the flush toilet body protrudes (only the flush toilet body has the corresponding protrusion) is also a configuration within the scope of the present invention.

[0022] Further, in this case, it is preferable that a fastener for fastening the bottom surface of the flush water tank and the top surface of the flush toilet body to each other is attached to at least two of the three protrusions.

[0023] According to this configuration, the stability provided by "three-point support" can also be utilized for attaching the fastener.

[0024] Further, in this case, it is preferable that at least one bottom surface of the three protrusions has an inclined surface capable of corresponding to warpage of the upper surface of the flush toilet body.

[0025] According to this configuration, when warpage exists on the upper surface of the flush toilet body, the assembling work can be performed to absorb the warpage, thereby effectively facilitating the installation work of the flush toilet device.

[0026] Further, in this case, it is preferable that the inclined surface is formed such that an amount of downward projection in a rear side region is larger than an amount of downward projection in a front side region.

[0027] In this case, when the inclined surface is fastened to the upper surface of the flush toilet body, the protruding portion including the inclined surface, and consequently the entire flush water tank, is urged to assume a forward tilted posture. This is advantageous for design aimed at achieving a low silhouette.

[0028] Further, in this case, it is preferable that the inclination angle of the inclined surface is formed within a range of 2° to 3°.

[0029] According to this, an effective absorption function can be achieved for warpage that may occur on the upper surface of the flush toilet body. Effects of the Invention

[0030] According to the present invention, in an aspect in which the bottom surface of a flush water tank is directly supported on the upper surface of a flush toilet body, the stability of the mounted state (fixed state) can be improved by employing three-point support instead of the conventional four-point support. Brief Description of the Drawings

[0031] [Figure 1] It is a schematic exploded view of main components of a flush toilet device according to an embodiment of the present invention. [Figure 2] It is a schematic view showing an assembly procedure of the flush toilet device according to the present embodiment. [Figure 3] It is a plan view of a flush toilet body of the flush toilet device according to the present embodiment. [Figure 4] It is a bottom side perspective view of a flush water tank of the flush toilet device according to the present embodiment. [Figure 5] It is a bottom view of a flush water tank of the flush toilet device according to the present embodiment. [Figure 6] It is a perspective view of a drain outlet portion of a flush water tank of the flush toilet device according to the present embodiment. [Figure 7] This is a cross-sectional view of the fastening portion between the flushing water tank and the toilet body of the flush toilet device according to this embodiment. [Figure 8] This figure shows the close-coupling packing of a flush toilet device according to this embodiment, with Figure 8(a) being a perspective view, Figure 8(b) being a plan view, and Figure 8(c) being a cross-sectional view. [Figure 9] This is a side view showing the U-shaped projection of the flushing water tank of a flush toilet device according to this embodiment. [Figure 10] Figure 3 is a schematic diagram showing an example of a cross-section along line XX. [Figure 11] This is a perspective view showing a conventional nut with a venting surface. [Figure 12] This is a cross-sectional view of the fastening portion between the mounting base plate and the toilet body of a conventional flush toilet device. [Figure 13] This is a bottom-side perspective view of the flushing water tank of a conventional flush toilet. [Figure 14] This figure corresponds to Figure 7 in Patent Document 1. [Figure 15] This figure corresponds to Figure 8 in Patent Document 1. [Modes for carrying out the invention]

[0032] (composition) Next, with reference to the attached drawings, a flush toilet device according to one embodiment of the present invention will be described.

[0033] Figure 1 is a schematic exploded view of the main elements of a flush toilet device 1 according to one embodiment of the present invention, Figure 2 is a schematic diagram showing the assembly procedure of the flush toilet device 1 according to this embodiment, and Figure 3 is a plan view of the flush toilet body 2 of the flush toilet device 1 according to this embodiment.

[0034] As shown in Figure 1, the flush toilet device 1 of this embodiment comprises a ceramic flush toilet body 2, a shut-off valve 3 placed on the floor, a water supply hose 4 connected from the shut-off valve 3, a valve cover 5 housing a valve device 11 (see Figure 2), a flush water tank 6, and fastening bolts 7 and resin nuts 8 for fastening the flush water tank 6 to the flush toilet body 2. As can be seen from Figure 1, the flush water tank 6 is located on the rear side of the flush toilet body 2.

[0035] As shown in Figure 2(a), the main components shown in Figure 1, the close-coupling packing 9 (details will be described later), and the valve device 11 are assembled first. Subsequently, as shown in Figure 2(b), the Washlet® device 12 is installed, and then, as shown in Figure 2(c), the Washlet® device cover 13 (having a lid 13a for the bowl portion 22 of the flush toilet body 2 (see Figure 3)) and the side cover 14 are installed.

[0036] As shown in Figure 3, the toilet bowl body 2 is provided with a flushing water supply port 21 and a bowl section 22. A drain trap pipe (not shown) is provided at the bottom of the bowl section 22. The flushing water tank 6 is designed to store flushing water for cleaning the bowl section 22.

[0037] The double concentric downward projection 9a (see Figure 8(c)) of the sealing packing 9 fits around the cleaning water supply port 21. The double concentric downward projection (groove) may be provided on the cleaning water supply port 21 side, rather than on the sealing packing 9 side.

[0038] Furthermore, in the upper surface wall of the toilet bowl body 2, a pair of through holes 27 (bolt holes) (centers) through which fastening bolts 7 pass are provided at positions separated to the left and right of the center of the flushing water supply port 21 of the toilet bowl body 2 in a plan view.

[0039] An annular projection 26 is provided so as to surround each through-hole 27 (see Figure 10).

[0040] Furthermore, in a plan view, a circular projection 23 (center) is provided at a position forward of the center of the flushing water supply port 21 of the flushing toilet body 2, on which the oval projection 63 (see Figure 4) of the flushing water tank 6 abuts (seats).

[0041] Next, Figure 4 is a bottom perspective view of the flushing water tank 6 of the flush toilet device 1 according to this embodiment, Figure 5 is a bottom view of the flushing water tank 6, Figure 6 is a perspective view of the drain port 61 portion of the flushing water tank 6, and Figure 7 is a cross-sectional view of the fastening portion between the flushing water tank 6 and the flush toilet body 2 (including a cross-sectional view of a pair of fastening bolts).

[0042] As shown in Figures 4 to 7, in the flush toilet device 1 of this embodiment, the drain port 61 of the flush water tank 6 has a substantially cylindrical drain port projection 61p that protrudes downward. As shown in Figure 7, this drain port projection 61p is inserted into the upper end of the flush water supply port 21 of the flush toilet body 2. In this way, the drain port 61 of the flush water tank 6 and the flush water supply port 21 of the flush toilet body 2 are connected. This connection is located on a virtual left-right center line extending in the front-rear direction of the flush toilet body 2 (see Figure 3).

[0043] As shown in Figure 7, an annular sealing packing 9 is fitted to the outer surface of the drain outlet projection 61p. The sealing packing 9 is pressed between the bottom surface of the flush water tank 6 around the drain outlet projection 61p and the top surface of the toilet bowl body 2 around the flush water supply port 21, thereby sealing the two together.

[0044] Figure 8 shows the close-coupling packing 9 of this embodiment, with Figure 8(a) being a perspective view, Figure 8(b) being a plan view, and Figure 8(c) being a cross-sectional view. However, the close-coupling packing 9 is a conventionally known component.

[0045] As shown in Figures 4 to 6, the outer surface of the drain port projection 61p in this embodiment has an air-venting pattern of bumps and grooves. Therefore, when fitting the sealing packing 9 onto the drain port projection 61p, air can pass through the air-venting pattern on the drain port projection 61p. This reliably prevents air from accumulating between the drain port projection 61p and the sealing packing 9, which would impair the sealing function of the sealing packing 9.

[0046] Furthermore, as shown in Figure 7, the bottom surface of the flushing water tank 6 is directly supported by the top surface of the toilet bowl body 2 (without the use of a mounting base plate).

[0047] More specifically, as shown in Figures 4 to 7, the bottom surface of the flushing water tank 6 of this embodiment is provided with a pair of U-shaped protrusions 62 which are intended to contact a pair of annular protrusions 26 of the toilet bowl body 2, and an oval-shaped protrusion 63 which is intended to contact a circular protrusion 23 of the toilet bowl body 2.

[0048] In other words, in the flush toilet device 1 of this embodiment, the bottom surface of the flush water tank 6 and the top surface of the flush toilet body 2 are supported by contact at only three locations away from the connection between the drain port 61 and the flush water supply port 21: a pair of U-shaped protrusions 62 and a circular protrusion 23 / oval protrusion 63.

[0049] The former two locations (a pair of U-shaped protrusions 62 / a pair of U-shaped protrusions 62) are arranged symmetrically with respect to a virtual left-right center line extending in the front-rear direction of the toilet bowl body 2, and are positioned to sandwich the connection between the drain port 61 and the flushing water supply port 21 in the left-right direction.

[0050] The latter one (circular projection 23 / oval projection 63) is positioned on the aforementioned centerline in a plan view.

[0051] Next, to explain the details of the U-shaped projection 62, the parallel straight sections of the U-shaped projection 62 (the side opposite to the semicircular section) are aligned facing forward.

[0052] As shown in Figure 7, a guide groove 64 is provided on the upper side (back side) of the U-shaped projection 62, configured to allow the head 7h of the fastening bolt 7 to slide. The guide groove 64 is aligned and extends forward, exiting to the front side of the cleaning water tank 6. In other words, the fastening bolt 7 can access the guide groove 64 from the front side of the cleaning water tank 6. (However, the fastening bolt 7 can also access the guide groove 64 from the bottom side of the cleaning water tank 6, in front of the U-shaped projection 62.)

[0053] In this embodiment, the head 7h of the fastening bolt 7 is square-shaped. As a result, when the head 7h of the fastening bolt 7 slides and reaches the U-shaped projection 62, the inner diameter of the semicircular part of the U-shaped projection 62 is larger than the diameter of the main body (threaded part) 7b of the fastening bolt 7, and the head 7h of the fastening bolt 7 is supported by the shelf-shaped support part 64s in the guide groove 64.

[0054] After the pair of fastening bolts 7 are in this supported position, they are each passed through the through-holes 27 in the toilet bowl body 2. Then, the corresponding resin nuts 8 are screwed onto the through-holes 27 from below. In this way, the heads 7h of the fastening bolts 7 fasten the flush water tank 6 to the toilet bowl body 2 via the U-shaped projections 62.

[0055] As shown in Figures 4 to 7, the U-shaped projection 62 of this embodiment has a cavity in the intermediate region in the wall thickness direction. This provides a weak point where the thickness of the shelf-shaped support portion 64s and its vicinity is reduced. This is because, in the event of an unwanted load being applied to the fastening portion by the fastening bolts 7, it is easier to repair and deal with the damage if the shelf-shaped support portion 64s and / or its vicinity are damaged before the ceramic toilet bowl body 2 is damaged.

[0056] Furthermore, as shown in Figure 7, the height (depth) of the guide groove 64 relative to the shelf-shaped support portion 64s is more than twice the height of the head 7h of the fastening bolt 7. In other words, when the head 7h of the fastening bolt 7 is supported by the shelf-shaped support portion 64s (the state in Figure 7), the guide groove 64 (an example of the shelf-shaped support portion 64s and / or its vicinity) is formed such that a space of about the height of one head remains above the head 7h of the fastening bolt 7. This is also because, in the event of an unwanted load being applied to the fastening portion by the fastening bolt 7, it is easier to repair and deal with the subsequent damage if the shelf-shaped support portion 64s and / or its vicinity is damaged before the ceramic toilet bowl body 2 is damaged.

[0057] Next, Figure 9 is a side view showing the U-shaped projection 62 of the flushing water tank 6. As shown in Figure 9, the bottom surface of the parallel straight section (excluding the semicircular section) of the U-shaped projection 62 is formed as an inclined surface that can accommodate the curvature of the upper surface of the toilet bowl body 2.

[0058] More specifically, the inclined surface is formed by a greater downward protrusion in the rear region than in the front region, and the inclination angle of the inclined surface is in the range of 1° to 3°.

[0059] The inclined surface effectively absorbs manufacturing errors (dimensional errors) in the ceramic toilet bowl body 2. Figure 10 is a schematic diagram showing an example of a cross-section along line XX in Figure 3. In the example in Figure 10, the annular projection 26 of the toilet bowl body 2 is warped. Even when such warping (manufacturing error) exists, the inclined surface shown in Figure 9 acts to counteract the warping, thus stabilizing the contact support state between the U-shaped projection 62 and the annular projection 26.

[0060] (Effects and Benefits) According to the flush toilet device 1 of this embodiment described above, in the configuration in which the bottom surface of the flush water tank 6 is directly supported on the upper surface of the flush toilet body 2, by adopting a three-point contact support instead of the conventional four-point contact support, the stability of the mounted (fixed) state can be increased, especially when there is a slight "warp" or the like on the upper surface of the flush toilet body 2.

[0061] Furthermore, according to the flush toilet device 1 of this embodiment, the connection between the drain port 61 of the flush water tank 6 and the flush water supply port 21 of the flush toilet body 2 is located on a virtual left-right center line extending in the front-rear direction of the flush toilet body 2 (see Figure 3), and the contact support positions of the pair of U-shaped protrusions 62 and the pair of annular protrusions 26, which are two of the three contact support points, are arranged symmetrically with respect to the virtual left-right center line extending in the front-rear direction of the flush toilet body 2. This feature allows for better balance in supporting the bottom surface of the flush water tank 6.

[0062] Furthermore, in the flush toilet device 1 of this embodiment, the contact support positions of the pair of U-shaped protrusions 62 and the pair of annular protrusions 26, which are two of the three contact support points, are arranged to sandwich the connection between the drain port 61 and the flush water supply port 21 in the left-right direction. This feature allows for even better balance in supporting the bottom surface of the flush water tank 6.

[0063] Furthermore, in the flush toilet device 1 of this embodiment, the contact support position between the circular projection 23 and the oval projection 63, which is the remaining one of the three contact support points, is located on the center line in a plan view. This feature allows the bottom surface of the flush water tank 6 to be supported with even better balance relative to the connection part.

[0064] Furthermore, according to the flush toilet device 1 of this embodiment, the bottom surface of the flush water tank 6 has a protruding portion (U-shaped protrusion 62 or oval protrusion 63) that protrudes downward at each of the three locations. This feature makes it easy to achieve three-point support (three-point contact support).

[0065] Furthermore, according to the flush toilet device 1 of this embodiment, the upper surface of the flush toilet body also has protrusions (annular protrusions 26 or circular protrusions 23) that project upward at each of the three locations. This feature also makes it easy to achieve three-point support (three-point contact support).

[0066] Furthermore, in the flush toilet device 1 of this embodiment, fastening bolts 7 and resin nuts 8 (an example of fasteners) are attached to fasten the front surface of the flush water tank 6 and the upper surface of the flush toilet body 2 to each other at the contact support positions of a pair of U-shaped protrusions 62 and a pair of annular protrusions 26, which are two of the three contact support points. This allows the stability provided by the three-point support (three-point contact support) to also be utilized in the attachment of the fastening bolts 7 and resin nuts 8.

[0067] In other words, according to the flush toilet device 1 of this embodiment, in a configuration in which the bottom surface of the flush water tank 6 is directly supported by the upper surface of the flush toilet body 2, fastening bolts 7 and resin nuts 8 (an example of fasteners) that fasten the bottom surface of the flush water tank 6 and the upper surface of the flush toilet body 2 to each other are attached within the area in which the bottom surface of the flush water tank 6 is directly supported by the upper surface of the flush toilet body 2, thereby increasing the stability of the mounted (fixed) state.

[0068] Furthermore, according to the flush toilet device 1 of this embodiment, as shown in Figure 9, the bottom surface of the parallel straight section (excluding the semicircular section) of the U-shaped projection 62 is formed as an inclined surface that can accommodate the curvature of the upper surface of the flush toilet body 2. This feature allows the assembly work to be carried out in a way that absorbs the curvature when there is a curvature on the upper surface of the flush toilet body 2, thereby effectively simplifying the installation work of the flush toilet device 1.

[0069] Furthermore, according to the flush toilet device 1 of this embodiment, the inclined surface is formed such that the amount of downward protrusion in the rear region is greater than the amount of downward protrusion in the front region. Due to this feature, when the inclined surface is fastened to the upper surface of the flush toilet body 2, the U-shaped protrusion 62 including the inclined surface, and consequently the entire flush water tank 6, is encouraged to take a forward-tilting position. This is advantageous for designs aimed at achieving a low profile.

[0070] Furthermore, according to the flush toilet device 1 of this embodiment, the inclination angle of the inclined surface is formed within the range of 1° to 3°. This feature allows for an effective absorption function against warping that may occur on the upper surface of the flush toilet body 2.

[0071] Furthermore, according to the flush toilet device 1 of this embodiment, the fasteners used to fasten the bottom surface of the flush water tank 6 and the top surface of the flush toilet body 2 to each other include a fastening bolt 7 (an example of a bolt member) having a head 7h supported by a shelf-shaped support portion 64s provided on the bottom surface of the flush water tank 6, and a resin nut 8 (an example of a nut member) that is screwed onto the fastening bolt 7, which passes through a corresponding through hole 27 (an example of a bolt hole) provided on the upper surface forming wall of the flush toilet body 2, from the lower side of the upper surface forming wall. This feature allows for reliable fastening despite the simple structure.

[0072] Furthermore, in the flush toilet device 1 of this embodiment, a cavity is provided in the intermediate region of the U-shaped projection 62 in the wall thickness direction. As a result, a weaker area with reduced wall thickness is provided in the shelf-shaped support portion 64s and its vicinity. This feature makes it possible to encourage the shelf-shaped support portion 64s and / or its vicinity to be damaged before the ceramic flush toilet body 2 is damaged when an unwanted load is applied to the fastening portion by the fastening bolt 7, thereby facilitating subsequent repairs and other countermeasures.

[0073] Furthermore, in the flush toilet device 1 of this embodiment, the height (depth) of the guide groove 64 relative to the shelf-shaped support portion 64s is more than twice the height of the head 7h of the fastening bolt 7. That is, in the state in which the head 7h of the fastening bolt 7 is supported by the shelf-shaped support portion 64s (state in Figure 7), the guide groove 64 (an example of the shelf-shaped support portion 64s and / or its vicinity) is formed such that a space of about the height of one head remains above the head 7h of the fastening bolt 7. This feature also makes it possible to encourage the shelf-shaped support portion 64s and / or its vicinity to be damaged before the ceramic flush toilet body 2 is damaged when an unwanted load is applied to the fastening portion by the fastening bolt 7, thereby facilitating subsequent repairs and other countermeasures.

[0074] Furthermore, according to the flush toilet device 1 of this embodiment, a structure is adopted in which the bottom surface of the flush water tank 6 is directly supported on the upper surface of the flush toilet body 2, and a cylindrical drain port projection 61p is provided at the drain port 61 of the flush water tank 6. This eliminates the need to use a nut 111, which was a separate component from the mounting base plate 113 in the conventional structure (see Figure 12), and allows the annular close-coupling packing 9 to be directly fitted to the outer surface of the drain port projection 61p. This reduces the number of parts and lowers manufacturing costs.

[0075] Furthermore, according to the flush toilet device 1 of this embodiment, an air-venting pattern of bumps and grooves is formed along the entire height of the outer surface of the drain outlet projection 61p (see Figures 4 to 6). This provides a good air-venting effect and also significantly increases the strength of the drain outlet projection 61p, improving its durability.

[0076] (Variation 1) In the embodiment described above, as shown in Figure 9, only the bottom surface of the parallel straight portion (excluding the semicircular portion) of the U-shaped projection 62 was formed as an inclined surface, while the bottom surface of the semicircular portion of the U-shaped projection 62 was formed as a flat surface.

[0077] However, at least at the time of filing this application, the invention is not limited to this form, and in accordance with the expected manufacturing tolerance of the flush toilet body 2 (usually made of ceramic), a part of the bottom surface of the semicircular portion of the U-shaped projection 62 may also be formed as an inclined surface, and furthermore, the entire bottom surface of the semicircular portion of the U-shaped projection 62 may also be formed as an inclined surface.

[0078] (Modification 2) In the embodiment described above, as shown in Figures 4 and 5, the semicircular portion of the U-shaped projection 62 is located on the rear side, the parallel straight portion of the U-shaped projection 62 (the side opposite to the semicircular portion) is aligned facing forward, and the guide groove 64 is also aligned facing forward and extends out to the front side of the washing water tank 6.

[0079] However, at least at the time of filing this application, the invention is not limited to this configuration, and other configurations may be adopted, such as one in which the semicircular portion of the U-shaped projection 62 is located on the front side, the parallel straight portion of the U-shaped projection 62 (on the opposite side from the semicircular portion) is aligned toward the rear, and the guide groove 64 is also aligned toward the rear and extends out to the rear side of the cleaning water tank 6.

[0080] (Variation 3) In the above-described embodiment, as shown in Figures 4 to 6, an air-venting pattern of bumps and grooves is formed over the entire height of the outer surface of the drain port projection 61p. This embodiment provides a good air-venting effect and also improves durability by significantly increasing the strength of the drain port projection 61p.

[0081] However, at least at the time of filing this application, the invention is not limited to this configuration, and if it is effective in venting air, a configuration in which an air-venting pattern is formed only on a part of the outer surface of the drain port projection 61p may also be adopted.

[0082] However, according to the inventor's various verification results, when an uneven pattern is formed on the outer surface of the drain port projection 61p in a height region greater than or equal to the height of the close-coupling packing 9, a sufficient air venting effect is obtained, and the strength of the drain port projection 61p is sufficiently increased, improving durability.

[0083] Furthermore, the present invention includes the following features (inventions). [Feature 1] A flush toilet device that performs flushing using flushing water stored in a flushing water tank, A flush toilet body having a bowl section and a drain trap pipe extending from the lower part of the bowl section, A flush water tank is located at the rear of the toilet bowl and stores flush water for cleaning the bowl portion of the toilet bowl. Equipped with, The drain port of the aforementioned flushing water tank and the flushing water supply port of the aforementioned flush toilet body are connected. The bottom surface of the flushing water tank is directly supported in contact with the top surface of the toilet bowl body. The bottom surface of the flushing water tank and the top surface of the flush toilet body are supported by contact at only three points, away from the connection between the drain and the flushing water supply port. A flush toilet device characterized by the following features. [Feature 2] The aforementioned connection portion is located on a virtual left-right center line extending in the front-rear direction of the toilet bowl body. Two of the three locations mentioned above are arranged symmetrically with respect to the center line. A flush toilet device as described in Feature 1, characterized by the features described above. [Feature 3] The two locations mentioned above are positioned to sandwich the connection portion in the left-right direction. A flush toilet device as described in Feature 2, characterized by the features described above. [Feature 4] The remaining of the three locations mentioned above is located on the center line in a plan view. A flush toilet device as described in Feature 3, characterized by the features described above. [Feature 5] The bottom surface of the washing water tank has a protrusion that extends downward at each of the three locations. A flush toilet device according to any one of features 1 to 4. [Feature 6] At least two of the three protruding portions are fitted with fasteners that connect the bottom surface of the flushing water tank and the top surface of the toilet bowl body to each other. A flush toilet device according to any one of features 1 to 5. [Feature 7] The bottom surface of at least one of the three protruding parts has an inclined surface that can accommodate the curvature of the upper surface of the toilet bowl body. A flush toilet device according to any one of features 1 to 6. [Feature 8] The inclined surface is formed by the fact that the amount of downward protrusion in the rear region is greater than the amount of downward protrusion in the front region. A flush toilet device as described in Feature 7, characterized by the features described above. [Feature 9] The inclination angle of the aforementioned inclined surface is formed within the range of 1° to 3°. A flush toilet device according to feature 7 or 8. [Explanation of symbols]

[0084] 1 Flush toilet device 2 Flush toilet body 3. Shut-off valve 4. Water supply hose 5 Valve cover 6. Washing water tank 7 Fastening bolts 7h head 7b Main body (screw part) 8. Resin nuts 9. Close-coupled packing 9a (Double concentric) lower projection 11 Valve device 12 Washlet (registered trademark) device 13 Washlet (registered trademark) device cover 13a Lid body 14 Side Covers 21 Washing water supply port 22 Bowl section 23 Circular protrusion 26 Annular projection 27 Through hole 61 Drain 61p Drain protrusion 62 U-shaped protrusion 63 Oval protrusion 64 Guide groove 64s shelf support 101 Toilet bowl 104 Toilet bowl 106 Washing water tank 107 Mounting bolts 107h head 108 Resin nuts 111 Nut 112 Mounting board 121 Washing water supply port 122 Tank body 123 Mounting board 125 Tank Legs 127 bolt holes 131 Gold plate 159 screws 161 Drain 162 Seating projection

Claims

1. A flush toilet device that performs flushing using flushing water stored in a flushing water tank, A flush toilet body having a bowl section and a drain trap pipe extending from the lower part of the bowl section, A flush water tank is located at the rear of the toilet bowl and stores flush water for cleaning the bowl portion of the toilet bowl. Equipped with, The drain port of the aforementioned flushing water tank and the flushing water supply port of the aforementioned flush toilet body are connected. The bottom surface of the flushing water tank is directly supported in contact with the top surface of the toilet bowl body. The bottom surface of the flushing water tank and the top surface of the flush toilet body are supported by contact at only three points, away from the connection between the drain and the flushing water supply port. A flush toilet device characterized by the following features.

2. The aforementioned connection portion is located on a virtual left-right center line extending in the front-rear direction of the toilet bowl body. Two of the three locations mentioned above are arranged symmetrically with respect to the center line. The flush toilet device according to feature 1.

3. The two locations mentioned above are positioned to sandwich the connection portion in the left-right direction. The flush toilet device according to feature 2.

4. The remaining of the three locations is located on the center line in a plan view. The flush toilet device according to feature 3.

5. The bottom surface of the washing water tank has a projection that protrudes downward at each of the three locations. A flush toilet device according to any one of claims 1 to 4.

6. At least two of the three protruding portions are fitted with fasteners that connect the bottom surface of the flushing water tank and the top surface of the toilet bowl body to each other. The flush toilet device according to feature 5.

7. The bottom surface of at least one of the three protruding portions has an inclined surface that can accommodate the curvature of the upper surface of the toilet bowl body. The flush toilet device according to feature 5.

8. The inclined surface is formed by the fact that the amount of downward protrusion in the rear region is greater than the amount of downward protrusion in the front region. The flush toilet device according to feature 7.

9. The inclination angle of the aforementioned inclined surface is formed within the range of 1° to 3°. The flush toilet device according to feature 8.

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