Water-washing toilet device

Abstract

To provide a flush toilet device that does not require a mounting board to be interposed between the flush water tank and the toilet body, and that does not interfere with the installation of the case cover that covers the flush water tank. [Solution] The flush toilet is equipped with a flush water tank located on the rear side of the toilet bowl and storing flush water for cleaning the bowl portion of the toilet bowl. The flush water tank is covered by a case cover, and at least one convex or concave engaging portion is provided on the side of the flush water tank. Multiple concave or convex engaging portions are provided on the inner surface of the case cover, which are complementary to the convex or concave engaging portion. The mounting position of the case cover to the flush water tank can be adjusted by selectively engaging the convex or concave engaging portion with one of the multiple concave or convex engaging portions.

Description

[Technical Field]

[0001] The present invention relates to a flush toilet device, and particularly to a flush toilet device that performs flushing using flush water stored in a flush water tank. [Background Art]

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

[0003] Specifically, first, a nut 111 having an uneven structure for air bleeding as shown in FIG. 17 is prepared, and in a state where a known annular tight-fitting packing 9 (see FIG. 8 described later) is fitted onto an outer periphery of the nut 111, the nut 111 is fitted into a flush water supply port 121 opened in the upper surface of the flush toilet body. Then, as shown in FIG. 18, a mounting base plate 112 is set on the nut 111 and the tight-fitting packing 9.

[0004] At this time, a mounting bolt 107 fitted to 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, whereby 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 portion 107h of the mounting bolt 107.

[0005] Then, a flush water tank 106 as shown in FIG. 19 is set on the mounting base plate 132 fastened as described above, that is, the flush water tank 106 is placed in a well-balanced manner by four seating protrusions 162, and a drain port 161 of the flush water tank 106 is fitted into the nut 111, so that the flush water tank 106 is connected to the flush water supply port 121 of the flush toilet body.

[0006] In a different configuration, as shown in Figures 20 and 21 (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 104 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, the top surface of the toilet bowl may have slight warping or other imperfections. If the bottom surface of the flushing water tank is directly supported on the top surface of such a toilet bowl, the dimensional error of the toilet bowl will be directly reflected in the external shape of the flushing water tank to which it is attached. This raises concerns that the installation of the case cover that surrounds the flushing water tank may become difficult (or even impossible).

[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 the interposition of a mounting base plate between the flush water tank and the flush toilet body, and does not interfere with the installation work of the case cover that covers the flush water tank. [Means for solving the problem]

[0011] A first aspect of the present invention is a flush toilet device that performs flushing with 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 disposed 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 flushing water tank is covered by a case cover, at least one convex engaging portion or concave engaging portion is provided on the side surface of the flushing water tank, and a plurality of concave engaging portions or convex engaging portions are provided on the inner surface of the case cover that can engage complementaryly with the convex engaging portion or concave engaging portion, and the mounting position of the case cover with respect to the flushing water tank can be adjusted by selectively engaging the convex engaging portion or concave engaging portion with any of the plurality of concave engaging portions or convex engaging portions.

[0012] According to a first aspect of the present invention, dimensional errors can be effectively absorbed by selectively engaging a convex engaging portion or a concave engaging portion with any of a plurality of concave engaged portions or convex engaged portions. This makes it possible to absorb positional misalignment caused by dimensional errors in the toilet bowl body, for example, when directly attaching a flushing water tank to a ceramic toilet bowl body.

[0013] In the first embodiment of the present invention, it is preferable that the plurality of concave engaging portions or convex engaging portions are formed in a comb-like shape when viewed from the side.

[0014] According to this, dimensional errors can be absorbed at minute intervals while also being able to withstand loads.

[0015] In this case, it is preferable that each of the convex engaging portion or the concave engaging portion is a flat plate-shaped rib or a flat plate-shaped rib receiving groove.

[0016] According to this, it can withstand a sufficient load.

[0017] Furthermore, in this case, it is preferable that a plurality of the convex engaging portion or the concave engaging portion is provided, and that the mounting position of the case cover to the washing water tank can be adjusted by selectively engaging two or more of the plurality of convex engaging portions or concave engaging portions with two or more of the plurality of concave engaged portions or convex engaged portions.

[0018] According to this, by selectively engaging two or more of the multiple convex engaging portions or concave engaging portions with two or more of the multiple concave engaged portions or convex engaged portions, it is possible to withstand a larger load.

[0019] In this case, it is preferable that the multiple convex or concave engagement portions are formed in a comb-like shape when viewed from the side.

[0020] According to this, dimensional errors can be absorbed at minute intervals while also being able to withstand loads.

[0021] In this case, it is preferable that each of the convex engaging portion or the concave engaging portion is a flat plate-shaped rib or a flat plate-shaped rib receiving groove.

[0022] According to this, it can withstand a sufficient load.

[0023] A second aspect of the present invention provides a flush toilet apparatus that performs flushing using flush water stored in a flush water tank, comprising: a flush toilet body provided with a bowl portion and a drainage trap pipe extending from a lower part of the bowl portion; and a flush water tank disposed on a rear side of the flush toilet body and storing flush water for flushing the bowl portion of the flush toilet body, wherein the flush water tank is covered by a case cover, a plurality of convex engaging portions or concave engaging portions are provided on a side surface of the flush water tank, at least one concave engaged portion or convex engaged portion capable of complementary engaging with the convex engaging portion or the concave engaging portion is provided on an inner surface of the case cover, and a mounting position of the case cover relative to the flush water tank can be adjusted by selectively engaging any one of the plurality of convex engaging portions or the concave engaging portions with the concave engaged portion or the convex engaged portion.

[0024] According to the second aspect of the present invention, dimensional errors can be effectively absorbed by selectively engaging any one of the plurality of convex engaging portions or concave engaging portions with the concave engaged portion or the convex engaged portion. Accordingly, even when, for example, a flush water tank is directly attached to a ceramic flush toilet body, positional displacement caused by dimensional errors of the flush toilet body can be absorbed.

[0025] In the second aspect of the present invention, it is preferable that the plurality of convex engaging portions or the concave engaging portions are formed in a comb-tooth shape in a side view.

[0026] According to this feature, dimensional errors can be absorbed at fine intervals, while the structure can also withstand loads.

[0027] Further, in this case, it is preferable that each of the convex engaging portions or the concave engaging portions is a flat rib or a flat rib receiving groove. According to this feature, the structure can withstand a sufficient load.

[0028] Furthermore, in each of the above embodiments, it is preferable that an auxiliary mounting board is provided adjacent to the flushing water tank and attached to the toilet bowl body, and that the case cover is detachably fixed to the auxiliary mounting board. According to this, the auxiliary mounting board can provide a reference for positioning the case cover.

[0029] In this case, it is preferable that the case cover is further snap-fit ​​engaged with the auxiliary mounting substrate. According to this, by snap-fit ​​engaging with the auxiliary mounting substrate, the case cover can be positioned very easily relative to the reference for positioning the case cover. [Effects of the Invention]

[0030] According to a first aspect of the present invention, dimensional errors can be effectively absorbed by selectively engaging a convex engaging portion or a concave engaging portion with any of a plurality of concave engaged portions or convex engaged portions. This makes it possible to absorb positional misalignment caused by dimensional errors in the toilet bowl body, for example, when directly attaching a flushing water tank to a ceramic toilet bowl body. According to a second aspect of the present invention, dimensional errors can be effectively absorbed by selectively engaging one of a plurality of convex or concave engaging portions with a concave engaged portion or a convex engaged portion. This makes it possible to absorb positional misalignment caused by dimensional errors in the toilet bowl body, for example, when directly attaching a flushing water tank to a ceramic toilet bowl body. [Brief explanation of the drawing]

[0031] [Figure 1] This is a schematic exploded view of the main components of a flush toilet device according to one embodiment of the present invention. [Figure 2] This is a schematic diagram showing the assembly procedure for a flush toilet device according to this embodiment. [Figure 3]This is a plan view of the toilet unit of the flush toilet device according to this embodiment. [Figure 4] This is a perspective view of the bottom side of the flushing water tank of a flush toilet device according to this embodiment. [Figure 5] This is a bottom view of the flushing water tank of a flush toilet device according to this embodiment. [Figure 6] This is a perspective view of the drain port portion of the flushing water tank of a flush toilet device according to this 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 schematic vertical cross-sectional view of the flushing water tank of a flush toilet device according to this embodiment, in the left-right direction. [Figure 12] This is an enlarged cross-sectional view showing the engagement state between the side surface of the flushing water tank of the flush toilet device according to this embodiment and the inner surface of the case cover. [Figure 13] This is a schematic diagram showing the positional relationship in plan view between the flushing water tank and the auxiliary mounting base plate of the flush toilet device according to this embodiment. [Figure 14] This figure shows the case cover of the flush toilet device according to this embodiment, with Figure 14(a) being a downward side perspective view and Figure 14(b) being an enlarged view of the snap-fit ​​portion. [Figure 15] This figure shows the auxiliary mounting substrate for the flush toilet device according to this embodiment, with Figure 15(b) being an upper side perspective view and Figure 15(b) being an enlarged view of the snap-fit ​​portion. [Figure 16] This is a schematic diagram showing the snap-fit ​​engagement between the snap-fit ​​portion of the auxiliary mounting base plate of the flush toilet device according to this embodiment and the snap-fit ​​portion of the case cover. [Figure 17] This is a perspective view showing a conventional nut with a venting surface. [Figure 18] 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 19] This is a bottom-side perspective view of the flushing water tank of a conventional flush toilet. [Figure 20] This figure corresponds to Figure 7 in Patent Document 1. [Figure 21] This figure corresponds to Figure 8 in Patent Document 1. [Modes for carrying out the invention]

[0032] (Basic configuration) 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 elements 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 auxiliary mounting board 12 on which the Washlet® device is mounted is attached. After that, as shown in Figure 2(c), the case cover (Washlet® device cover) 13 (having a lid 13u for the bowl portion 22 of the flush toilet body 2 (see Figure 3)) and the side cover 14 are attached.

[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 of the basic configuration) 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] (Attaching the case cover) Next, Figure 11 is a schematic vertical cross-sectional view of the flushing water tank 6 of the flush toilet device 1 of this embodiment in the left-right direction, and Figure 12 is an enlarged cross-sectional view showing the engagement state between the side surface of the flushing water tank 6 of the flush toilet device 1 of this embodiment and the inner surface of the case cover 13.

[0077] In this embodiment, the left and right sides (outer sides) of the cleaning water tank 6 are tapered, widening slightly at the bottom. As shown in Figures 11 and 12, eleven flat plate-shaped ribs 6a to 6k, which serve as convex engaging parts, are formed to protrude in a comb-like pattern when viewed from the side from each of the left and right sides of the cleaning water tank 6.

[0078] Each of the 11 flat plate-like ribs 6a to 6k extends generally in a horizontal direction.

[0079] Each of the vertical gaps between two adjacent flat plate-shaped ribs 6a to 6k functions as a concave engaging portion (specifically, a flat plate-shaped rib receiving groove). These concave engaging portions are also visible in a comb-like pattern when viewed from the side.

[0080] On the other hand, in this embodiment, the left and right inner surfaces of the case cover 13 are also tapered, widening slightly at the bottom. As shown in Figures 11 and 12, five flat plate-shaped rib receiving grooves, which serve as concave engaging portions, are formed on each of the left and right inner surfaces of the case cover 13. In this embodiment, six flat plate-shaped ribs 13a to 13f (which can function as convex engaging portions) are formed to protrude in a comb-like manner when viewed from the side, and the vertical gap between two adjacent flat plate-shaped ribs 13a to 13f functions as a concave engaging portion (specifically, a flat plate-shaped rib receiving groove).

[0081] Each of the six flat plate-like ribs 13a to 13f extends generally in a horizontal direction.

[0082] Each of the vertical gaps between two adjacent flat plate-shaped ribs 13a to 13f functions as a concave engaging portion (specifically, a flat plate-shaped rib receiving groove). These concave engaging portions are also visible in a comb-like pattern when viewed from the side.

[0083] In this embodiment, each of the 11 flat plate-shaped ribs 6a to 6k (convex engaging portion) is configured to complementarily engage with each of the 5 gaps (concave engaged portion) provided by the 6 flat plate-shaped ribs 13a to 13f (at least at the time of filing this application, it is not necessarily required that they "fit together", but rather that they "bump into" each other).

[0084] Furthermore, in order to absorb positional misalignment caused by dimensional errors in the ceramic toilet bowl body 2, at least one (preferably two or more) of the 11 flat plate ribs 6a to 6k is configured to selectively engage with at least one (preferably two or more) of the five gaps provided by the six flat plate ribs 13a to 13f.

[0085] Furthermore, the configuration of this embodiment can also be described as being such that each of the 10 gaps (concave engagement portion) provided by the 11 flat plate ribs 6a to 6k is configured to engage complementaryly with each of the 5 flat plate ribs 13a to 13f (convex engagement portion).

[0086] Furthermore, it can be said that, in order to absorb positional misalignment caused by dimensional errors in the ceramic flush toilet body 2, at least one (preferably two or more) of the 10 gaps provided by the 11 flat plate ribs 6a to 6k selectively engages with at least one (preferably two or more) of the 6 flat plate ribs 13a to 13f.

[0087] Next, Figure 13 is a schematic diagram showing the positional relationship in plan view between the flushing water tank 6 and the auxiliary mounting base plate 12 of the flush toilet device 1 of this embodiment; Figure 14 is a diagram showing the case cover 13 of the flush toilet device 1 of this embodiment, with Figure 14(a) being a downward side perspective view and Figure 14(b) being an enlarged view of the snap-fit ​​portion 13s; Figure 15 is a diagram showing the auxiliary mounting base plate 12 of the flush toilet device 1 of this embodiment, with Figure 15(b) being an upward side perspective view and Figure 15(b) being an enlarged view of the snap-fit ​​portion 12s; and Figure 16 is a schematic diagram showing the snap-fit ​​engagement between the snap-fit ​​portion 12s of the auxiliary mounting base plate 12 and the snap-fit ​​portion 13s of the case cover 13 of the flush toilet device 1 of this embodiment.

[0088] As shown in Figure 13, in this embodiment, an auxiliary mounting board 12 is provided adjacent to the flushing water tank 6 and attached to the toilet body 2. Furthermore, as shown in Figures 14 to 16, the case cover 13 is also detachably fixed to the auxiliary mounting board 12.

[0089] In particular, in this embodiment, the case cover 13 is configured to snap-fit ​​engage with the auxiliary mounting substrate 12. More specifically, a pair of left and right snap-fit ​​portions 13s provided on the left and right inner surfaces of the case cover 13 snap-fit ​​engage with a pair of left and right snap-fit ​​portions 12s of the auxiliary mounting substrate 12.

[0090] The form of the snap-fit ​​portions 12s and 13s is not particularly limited, at least at the time of filing this application, but in a preferred example, as shown in Figures 14 to 16, the snap-fit ​​portion 13s is an inverted triangular shape with an acute angle portion 13t in a side view, and the snap-fit ​​portion 12s has a vertical wall surface 12v that guides the sliding of the acute angle portion 13t and a horizontal wall surface 12h that engages with the acute angle portion 13t.

[0091] In this example, as shown in Figure 16, when the case cover 13 is pushed downward against the auxiliary mounting base plate 12, the inclined surface of the snap-fit ​​portion 13s contacts the upper wall surface of the snap-fit ​​portion 12s (see Figure 16(a)). Subsequently, the case cover 13 elastically deforms so that its lower end spreads out to the left and right, and the acute-angled portion 13t slides downward along the vertical wall surface 12v of the snap-fit ​​portion 12s (see Figure 16(b)). Then, the positioning ribs 13r provided on the left and right inner surfaces of the case cover 13 reach (contact) the upper wall surface of the snap-fit ​​portion 12s (see Figure 16(c)). After that, by pushing the case cover 13 inward to return its left and right spread to its original state, the snap-fit ​​portion 12s fits between the snap-fit ​​portion 13 and the positioning ribs 13r (snap-fit ​​engagement).

[0092] (Effects of attaching the case cover) As described above, with the flush toilet device 1 of this embodiment, dimensional errors can be effectively absorbed by selectively engaging at least one of the convex engaging portions (flat plate-shaped ribs 6a to 6k) (or concave engaging portions provided by the gaps between them) of the flush water tank 6 with one of the concave engaged portions (or the flat plate-shaped ribs 13a to 13f (convex engaged portions)) provided by the gaps between the plurality of flat plate-shaped ribs 13a to 13f of the case cover 13. This allows for the absorption of positional deviations caused by dimensional errors of the flush toilet body 2, even when the flush water tank 6 is directly attached to a ceramic flush toilet body 2 (it is particularly effective in absorbing height deviations in the left-right direction, but can also absorb undesirable inclinations in the front-back direction, etc.).

[0093] Furthermore, in the flush toilet device 1 of this embodiment, multiple concave engaging parts (or convex engaging parts) are formed in a comb-like shape when viewed from the side. Therefore, dimensional errors can be absorbed at minute intervals, while also being able to effectively withstand loads.

[0094] Furthermore, in the flush toilet device 1 of this embodiment, each of the convex engaging portion (or concave engaging portion) is a flat plate-shaped rib 6a to 6k (or a flat plate-shaped rib receiving groove). Therefore, it can withstand a sufficient load.

[0095] Furthermore, according to the flush toilet device 1 of this embodiment, multiple convex engaging parts (or concave engaging parts) are provided, and two or more of the multiple convex engaging parts (or concave engaging parts) can be selectively engaged with two or more of the multiple concave engaged parts (or convex engaged parts). Therefore, it can withstand a larger load.

[0096] In this case, since multiple convex (or concave) engaging parts are formed in a comb-like pattern when viewed from the side, dimensional errors can be absorbed at minute intervals while also being able to effectively withstand loads.

[0097] Furthermore, in the flush toilet device 1 of this embodiment, an auxiliary mounting board 12 is provided adjacent to the flush water tank 6 and attached to the flush toilet body 2, and the case cover 13 is detachably fixed to the auxiliary mounting board 12 as well. This allows the auxiliary mounting board 12 to provide a reference for positioning the case cover 13.

[0098] Furthermore, according to the flush toilet device 1 of this embodiment, the case cover 13 is snap-fit ​​engaged with the auxiliary mounting base plate 12. This makes it extremely easy to position the case cover 13 relative to a reference for positioning the case cover 13.

[0099] (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.

[0100] 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.

[0101] (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.

[0102] 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.

[0103] (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.

[0104] 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.

[0105] 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.

[0106] 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 comprising 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 aforementioned cleaning water tank is covered by a case cover. The side surface of the aforementioned cleaning water tank is provided with at least one convex or concave engaging portion. The inner surface of the case cover is provided with a plurality of concave engaged portions or convex engaged portions that can engage complementaryly with the convex engaging portion or the concave engaging portion. By selectively engaging the convex engaging portion or the concave engaging portion with one of the plurality of concave engaged portions or the convex engaged portions, the mounting position of the case cover relative to the cleaning water tank can be adjusted. A flush toilet device characterized by the following features. [Feature 2] The multiple concave or convex engaging portions are formed in a comb-like shape when viewed from the side. A flush toilet device as described in Feature 1, characterized by the features described above. [Feature 3] Each of the convex engaging portion or the concave engaging portion is a flat plate-shaped rib or a flat plate-shaped rib receiving groove. A flush toilet device according to feature 1 or 2. [Feature 4] Multiple convex or concave engaging portions are provided. By selectively engaging two or more of the multiple convex engaging portions or concave engaging portions with two or more of the multiple concave engaged portions or convex engaged portions, the mounting position of the case cover relative to the cleaning water tank can be adjusted. A flush toilet device according to any one of the features 1 to 3. [Feature 5] The multiple convex or concave engagement portions are formed in a comb-like shape when viewed from the side. A flush toilet device as described in Feature 4, characterized by the features described above. [Feature 6] Each of the convex engaging portion or the concave engaging portion is a flat plate-shaped rib or a flat plate-shaped rib receiving groove. A flush toilet device as described in feature 4 or 5. [Feature 7] A flush toilet device that performs flushing using flushing water stored in a flushing water tank, A flush toilet body comprising 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 aforementioned cleaning water tank is covered by a case cover. Multiple convex or concave engaging portions are provided on the side surface of the aforementioned cleaning water tank. The inner surface of the case cover is provided with at least one recessed engaged portion or a convex engaged portion that can engage complementaryly with the convex engaging portion or the concave engaging portion. By selectively engaging one of the multiple convex engaging portions or the concave engaging portions with the concave engaged portion or the convex engaged portion, the mounting position of the case cover relative to the cleaning water tank can be adjusted. A flush toilet device characterized by the following features. [Feature 8] Multiple of the aforementioned convex or concave engagement portions are formed in a comb-like shape when viewed from the side. A flush toilet device as described in Feature 7, characterized by the features described above. [Feature 9] Each of the convex engaging portion or the concave engaging portion is a flat plate-shaped rib or a flat plate-shaped rib receiving groove. A flush toilet device according to feature 7 or 8. [Feature 10] Adjacent to the aforementioned flushing water tank, an auxiliary mounting board is provided, which is attached to the main body of the flush toilet. The case cover is also detachably fixed to the auxiliary mounting board. A flush toilet device according to any one of features 1 to 9. [Feature 11] The case cover is designed to snap-fit ​​engage with the auxiliary mounting board. A flush toilet device as described in feature 10. [Explanation of symbols]

[0107] 1 Flush toilet device 2 Flush toilet body 3. Shut-off valve 4. Water supply hose 5 Valve cover 6. Washing water tank 6a Flat plate-shaped ribs 6b Flat plate-shaped ribs 6c Flat rib 6d Flat plate rib 6e Flat plate rib 6f Flat Rib 6g flat rib 6h Flat plate rib 6i Flat Rib 6j flat plate rib 6k flat plate ribs 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. Auxiliary mounting board equipped with a Washlet (registered trademark) device. 12s snap-fit ​​section 12h horizontal wall 12V Vertical Wall Mount 13. Case cover (Washlet® device cover) 13u lid body 13a Flat plate-shaped ribs 13b Flat plate-shaped ribs 13c Flat plate rib 13d Flat Rib 13e Flat Rib 13f Flat plate-shaped ribs 13s Snap-fit ​​section 13t acute angle 13r positioning rib 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 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 comprising 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 aforementioned cleaning water tank is covered by a case cover. The side surface of the aforementioned cleaning water tank is provided with at least one convex or concave engaging portion. The inner surface of the case cover is provided with a plurality of concave engaged portions or convex engaged portions that can engage complementaryly with the convex engaging portion or the concave engaging portion. By selectively engaging the convex engaging portion or the concave engaging portion with one of the plurality of concave engaged portions or the convex engaged portions, the mounting position of the case cover relative to the cleaning water tank can be adjusted. A flush toilet device characterized by the following features.

2. The multiple concave or convex engaging portions are formed in a comb-like shape when viewed from the side. The flush toilet device according to feature 1.

3. Each of the convex engaging portion or the concave engaging portion is a flat plate-shaped rib or a flat plate-shaped rib receiving groove. The flush toilet device according to feature 2.

4. Multiple convex or concave engaging portions are provided. By selectively engaging two or more of the multiple convex engaging portions or concave engaging portions with two or more of the multiple concave engaged portions or convex engaged portions, the mounting position of the case cover relative to the cleaning water tank can be adjusted. A flush toilet device according to any one of claims 1 to 3.

5. The multiple convex or concave engagement portions are formed in a comb-like shape when viewed from the side. The flush toilet device according to feature 4.

6. Each of the convex engaging portion or the concave engaging portion is a flat plate-shaped rib or a flat plate-shaped rib receiving groove. The flush toilet device according to feature 5.

7. A flush toilet device that performs flushing using flushing water stored in a flushing water tank, A flush toilet body comprising 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 aforementioned cleaning water tank is covered by a case cover. Multiple convex or concave engaging portions are provided on the side surface of the aforementioned cleaning water tank. The inner surface of the case cover is provided with at least one recessed engaged portion or a convex engaged portion that can engage complementaryly with the convex engaging portion or the concave engaging portion. By selectively engaging one of the multiple convex engaging portions or the concave engaging portions with the concave engaged portion or the convex engaged portion, the mounting position of the case cover relative to the cleaning water tank can be adjusted. A flush toilet device characterized by the following features.

8. Multiple of the aforementioned convex or concave engagement portions are formed in a comb-like shape when viewed from the side. The flush toilet device according to feature 7.

9. Each of the convex engaging portion or the concave engaging portion is a flat plate-shaped rib or a flat plate-shaped rib receiving groove. The flush toilet device according to feature 8.

10. Adjacent to the aforementioned flushing water tank, an auxiliary mounting board is provided, which is attached to the main body of the flush toilet. The case cover is also detachably fixed to the auxiliary mounting board. A flush toilet device according to any one of claims 1 to 3 and 7 to 9.

11. The case cover is designed to snap-fit ​​engage with the auxiliary mounting board. The flush toilet device according to claim 10.

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