Drain socket

Abstract

This invention provides a drain socket constructed by joining multiple components while ensuring sufficient watertightness and durability. [Solution] The present invention relates to a drain socket (10) for connecting the drain trap pipe (6) of a flush toilet (1) to a drain pipe provided in a toilet room, comprising: a first member (12) that constitutes part of the drain socket; a second member (14) that is coupled to the first member and also constitutes part of the drain socket; and a sealing member (28) that is positioned between the coupling surface of the first member and the coupling surface (14b, 26c) of the second member to ensure watertightness between the first member and the second member, wherein the coupling surface of the first member and the coupling surface of the second member are curved surfaces, and the first member and the second member are coupled by engagement.

Description

Technical Field

[0001] The present invention relates to a drainage socket, and more particularly to a drainage socket for connecting a drain trap pipe of a flush toilet to a drainage pipe provided in a toilet room.

Background Art

[0002] Japanese Patent Laid-Open No. 2023-67281 (Patent Document 1) describes a flush toilet. This flush toilet is provided with a drainage socket that connects a drain trap portion communicating with the bowl portion and a drain outlet on the floor surface. The drainage socket described in Patent Document 1 is configured by joining a resin-made vertical pipe, a rear curved portion, a horizontal drawing pipe, and a front curved portion.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problem to be Solved by the Invention

[0004] A resin drainage socket composed of a plurality of members is generally assembled by bonding or welding the respective members to couple them to each other. However, depending on the material constituting each member, there are problems that solvent bonding cannot be performed, and the watertightness and durability of the bonded portion over a long period of time cannot be sufficiently ensured.

[0005] Furthermore, if large amounts of solvents or adhesives are used to improve the watertightness and durability of the joints between each component, the adhesives used may seep into the drain socket's piping, causing burrs or the formation of steps. The drain socket is a component that induces the siphon effect within the drain trap of a flush toilet, and the shape of the internal piping strongly affects its performance. Therefore, if unnecessary burrs or steps are formed inside the drain socket's piping due to adhesives, the siphon effect may not occur easily, potentially negatively impacting the flushing performance of the toilet.

[0006] Therefore, the present invention aims to provide a drain socket constructed by joining multiple components while ensuring sufficient watertightness and durability. [Means for solving the problem]

[0007] To solve the above-mentioned problems, the present invention provides a drain socket for connecting the drain trap pipe of a flush toilet to a drain pipe installed in a toilet room, comprising: a first member that constitutes part of the drain socket; a second member that is coupled to the first member and also constitutes part of the drain socket; and a sealing member that ensures watertightness between the first member and the second member, wherein the dividing surface on the inside of the flow path of the first member and the second member is composed of multiple surfaces, and the first member and the second member are fixed by engagement.

[0008] With the present invention configured in this way, since the drain socket is composed of a first member and a second member coupled to the first member, the shape of the pipeline inside the drain socket can be designed relatively freely, and the shape of the pipeline inside can be accurately formed. Furthermore, since the watertightness between the first member and the second member is ensured by a sealing member, the watertightness performance over a long period can be predicted at the design stage, and the watertightness required for the drain socket can be guaranteed over a long period. In addition, since the first member and the second member are fixed by engagement, unnecessary burrs or steps are not generated due to adhesive overflow, the internal shape of the pipeline inside the drain socket can be ensured as designed, and a decrease in performance due to the coupling of the members can be avoided.

[0009] In the present invention, preferably, the sealing member is positioned outside the flow path surface of the joint surface between the first member and the second member.

[0010] With the present invention configured in this way, since the sealing member is positioned outside the flow path beyond the joint surface between the first member and the second member, the shape of the flow path can be precisely manufactured.

[0011] In the present invention, preferably, the first member or the second member is provided with a groove for receiving a sealing member.

[0012] With the present invention configured in this way, since the first member or the second member is provided with a groove for receiving the sealing member, it is possible to prevent the sealing member from undergoing unnecessary deformation and a decrease in watertight performance when joining the first member and the second member.

[0013] In the present invention, preferably, a stepped portion is provided on the joint surface of the first member and the joint surface of the second member, and the sealing member is positioned outside the stepped portion.

[0014] According to the present invention configured in this way, a stepped portion is provided on the joint surface of the first member and the second member, and the sealing member is positioned outside of this stepped portion. As a result, only the cleaning water that has passed through the stepped portion reaches the O-ring, and debris can be sufficiently suppressed from getting caught in the sealing member.

[0015] In the present invention, preferably, the first member is a bent tubular member, and the second member is connected to the bent portion of the first member.

[0016] With the present invention configured in this way, since the second member is connected to the bent portion of the first member, the shape of the inner wall surface of the bent portion can be formed relatively freely by the second member, and a high-performance drain socket can be constructed.

[0017] In the present invention, preferably, the second member is fixed to the outer circumference of the bent portion of the first member.

[0018] With the present invention configured in this way, since the second member is fixed to the outer circumference of the bent portion of the first member, the inner wall surface on the outer circumference of the bent pipe, which is important for ensuring the performance of the drain socket, can be formed by the second member, thereby improving the performance of the drain socket.

[0019] In the present invention, preferably, the first member and the second member are fixed together by the engagement of engaging means provided on each of them.

[0020] With the present invention configured in this way, the first member and the second member are fixed together by the engagement of the engaging means provided on each, so that the first member and the second member can be joined easily and reliably.

[0021] In the present invention, preferably, the first member and the second member are fixed together by a third member.

[0022] With the present invention configured in this way, since the first member and the second member are fixed by the third member, the first member and the second member can be firmly and securely joined. [Effects of the Invention]

[0023] According to the present invention, it is possible to ensure sufficient watertightness and durability while configuring the drain socket by joining a plurality of members. [Brief Description of the Drawings]

[0024] [Figure 1] This is a full cross-sectional view showing the entire flush toilet incorporating the drain socket according to the embodiment of the present invention. [Figure 2] This is a perspective view showing the entire drain socket according to the embodiment of the present invention. [Figure 3] This is a side cross-sectional view of the drain socket according to the embodiment of the present invention. [Figure 4] This is an enlarged cross-sectional view showing the mounting portion of the cap member and the inlet member in the drain socket according to the embodiment of the present invention. [Figure 5] This is a perspective view showing the mounting portion of the cap member on the main body member in the drain socket according to the embodiment of the present invention, with the cap member removed. [Figure 6] This is a perspective view of the inlet member provided in the drain socket according to the embodiment of the present invention, as viewed obliquely from below. [Figure 7] This is a perspective view of the cap member provided in the drain socket according to the embodiment of the present invention, as viewed obliquely from above. [Modes for Carrying Out the Invention]

[0025] Next, the drain socket according to the embodiment of the present invention will be described with reference to the accompanying drawings. Figure 1 is a full cross-sectional view showing the entire flush toilet incorporating the drain socket according to the embodiment of the present invention. Figure 2 is a perspective view showing the entire drain socket according to the embodiment of the present invention. Figure 3 is a side cross-sectional view of the drain socket according to the embodiment of the present invention.

[0026] As shown in Figure 1, the drain socket according to the embodiment of the present invention is used by being incorporated into a flush toilet 1. The flush toilet 1 has a flush toilet body 2, which has a bowl portion 4, a drain trap pipe 6 extending from the lower part of the bowl portion 4, and a flush water tank 8 for storing flush water to clean the bowl portion 4. The drain socket 10 of this embodiment is positioned to connect the downstream end of the drain trap pipe 6 to a drain pipe D provided on the floor surface F of the toilet room R. In this way, in this embodiment, the drain trap pipe 6 and the drain socket 10 constitute a so-called "S-shaped piping" that connects the drain trap pipe 6 to the drain pipe D provided on the floor surface F.

[0027] Furthermore, a rim outlet 4a is provided on the upper edge of the bowl portion 4, and a jet outlet 4b is provided on the lower part of the bowl portion 4. When flushing the toilet, the flushing water stored in the flushing water tank 8 is discharged from the rim outlet 4a and the jet outlet 4b, and the bowl portion 4 is flushed. As the flushing water flows in from the rim outlet 4a and the jet outlet 4b, the flushing water in the bowl portion 4 overflows the top 6a of the drain trap pipe 6 and flows out from the downstream end 6b of the drain trap pipe 6.

[0028] The flushing water flowing out from the downstream end 6b of the drain trap pipe 6 flows into the drain socket 10, inducing a siphon effect within the drain socket 10. Due to the siphon effect, the flushing water and waste in the bowl section 4 are drawn into the drain trap pipe 6, and the flushing water and waste in the bowl section 4 flow out into the drain socket 10. The flushing water and waste that flow into the drain socket 10 are discharged through the pipe inside the drain socket 10 to the drain pipe D on the floor surface F of the toilet room R.

[0029] Next, as shown in Figures 2 and 3, the drain socket 10 according to an embodiment of the present invention comprises a main body member 12, which is a first component; a cap member 14 (Figure 3), which is a second component, coupled to the bent portion of the main body member 12; and an inlet member 16 attached to the inlet portion of the main body member 12. In this embodiment, the main body member 12, the cap member 14, and the inlet member 16 constituting the drain socket 10 are all made of polypropylene (PP) resin and are coupled to each other.

[0030] The main body member 12 is a tubular member that is generally bent in an L-shape, and has an inlet 12a that opens vertically upward and an outlet 12b (Figure 3) that is connected to the drainage pipe D. In this specification, "bending" simply means bending (curving), and includes bending angles other than 90 degrees. Also, the "bent" part may be bent with a small radius, or it may curve in an arc of a certain size.

[0031] Furthermore, the inlet 12a is a circular opening that opens vertically upward and is configured to receive the downstream end 6b (Figure 1) of the drain trap pipe 6 that extends vertically downward. The outlet 12b is a circular opening that opens downward and is configured to receive the drain pipe D installed on the floor surface F of the toilet room R. As a result, the flushing water and waste that flow from the downstream end 6b of the drain trap pipe 6 into the inlet 12a of the drain socket 10 flow out through the pipeline inside the main body member 12 and are discharged from the outlet 12b into the drain pipe D.

[0032] More specifically, the main body member 12 consists of a vertical pipe section 18 extending generally vertically, a bent section 20 connected to the lower end of the vertical pipe section 18, a horizontal pipe section 22 connected downstream of the bent section 20 and extending generally horizontally, and an outlet section 24 connected downstream of the horizontal pipe section 22 and bent generally downward. In addition, the bottom surface of the bent section 20 of the main body member 12 is provided with legs 12c extending on both sides in the width direction. Furthermore, the outlet section 24 is provided with a substantially circular flange section 12d surrounding the outlet 12b. These legs 12c and flange section 12d allow the drain socket 10 to be stably positioned on the floor surface F. The drain socket 10 is fixed to the floor surface F by screwing the legs 12c and flange section 12d to the floor surface F.

[0033] As shown in Figure 3, the vertical pipe section 18 is a cylindrical portion that extends roughly vertically, with a large-diameter section 18a at its upper side and a small-diameter section 18b at its lower side. A stepped section 18c is provided between the large-diameter section 18a and the small-diameter section 18b. The inlet member 16 is received within the large-diameter section 18a.

[0034] The drain trap pipe 6 is connected to the drain socket 10 by having its downstream end 6b, which extends vertically downward, received within the upper part of the large-diameter section 18a. A packing (not shown) is placed between the downstream end 6b of the drain trap pipe 6 and the large-diameter section 18a of the drain socket 10 to ensure watertightness between the drain trap pipe 6 and the drain socket 10.

[0035] The bent section 20 is a pipe that communicates with the lower end of the vertical pipe section 18, and is configured to curve the flow path by approximately 90 degrees to connect the vertical pipe section 18, which extends in a substantially vertical direction, and the horizontal pipe section 22, which extends in a substantially horizontal direction. A cap member 14 is attached to the outer circumference of the curved bent section 20. That is, the bent section 20 is curved by approximately 90 degrees and connected to the horizontal pipe section 22 which extends in a substantially horizontal direction, and the cap member 14 is connected to the horizontal pipe section 22 so as to face it. The configuration of the connection part of the cap member 14 in the bent section 20 will be described later.

[0036] The horizontal pipe section 22 is a pipe with a circular cross-section that is connected to the downstream side of the bend 20 and extends in a substantially horizontal direction. The length of this horizontal pipe section 22 is set according to the horizontal distance between the downstream end 6b of the drain trap pipe 6 and the drain pipe D. The length of the horizontal pipe section 22 may be configured to be adjustable according to the position of the drain pipe D provided in the toilet room R where the flush toilet 1 is installed, or a drain socket 10 equipped with horizontal pipe sections 22 of various lengths may be prepared.

[0037] The outlet section 24 is a pipe with a circular cross-section connected to the downstream side of the horizontal pipe section 22, and extends in a roughly arc shape. That is, the outlet section 24 is curved in a roughly arc shape to connect the horizontal pipe section 22, which extends in a roughly horizontal direction, and the drainage pipe D, which opens roughly vertically upward. The downstream end of this outlet section 24 constitutes the outlet 12b, which is located inside the drainage pipe D installed on the floor surface F. A packing (not shown) is placed between the outlet 12b and the drainage pipe D to ensure watertightness.

[0038] Next, with reference to Figures 4 to 7, the configuration of the cap member 14 and the inlet member 16 attached to the main body member 12, and the connection structure of these members will be described. Figure 4 is a cross-sectional view showing an enlarged view of the mounting portion of the cap member 14 and the inlet member 16. Figure 5 is a perspective view showing the mounting portion of the cap member 14 on the main body member 12 with the cap member 14 removed. Figure 6 is a perspective view of the inlet member 16 viewed from diagonally below. Figure 7 is a perspective view of the cap member 14 viewed from diagonally above.

[0039] As shown in Figures 4 and 6, the inlet member 16 is a substantially cylindrical member as a whole, inserted into the large-diameter portion 18a at the upper part of the vertical pipe portion 18 of the main body member 12, and positioned on the stepped portion 18c. Furthermore, a stepped portion 16a extending substantially horizontally is provided at the upper part of the inlet member 16, and the cross-sectional area of ​​the flow path inside the inlet member 16 is narrowed at this stepped portion 16a. In addition, an expanded portion 16b is provided downstream (below) the stepped portion 16a, and the cross-sectional area of ​​the flow path widens towards the lower end of the inlet member 16. Furthermore, multiple substantially triangular fins 16c extending radially are provided on the inner wall surface of the expanded portion 16b.

[0040] With the configuration of this inlet member 16, a portion of the cleaning water flowing in from the downstream end 6b (Figure 1) of the drain trap pipe 6 is straightened by the fins 16c and flows along the inner wall surface of the expansion section 16b, where it collides with the stepped section 18c of the vertical pipe section 18. The colliding cleaning water bounces upward towards the center of the flow path within the inlet member 16, filling the flow path within the inlet member 16 and the area near the downstream end 6b of the drain trap pipe 6 with cleaning water. This induces a siphon effect within the drain trap pipe 6, drawing in the cleaning water from within the drain trap pipe 6 and the bowl section 4.

[0041] Next, the coupling structure of the inlet member 16 will be described. As shown in Figure 6, the upper end of the outer circumferential surface of the inlet member 16 is provided with four elongated outer circumferential projections 16d that extend along the upper end of the inlet member 16 (only two are shown in Figure 6). These outer circumferential projections 16d are formed to protrude outward along the upper edge of the outer circumferential surface of the inlet member 16 and are provided at equal intervals around the outer circumference of the inlet member 16. In addition, one end of each outer circumferential projection 16d is inclined to a surface 16e such that its height decreases in the vertical direction.

[0042] On the other hand, as shown in Figure 4, the inner circumferential surface of the large-diameter portion 18a of the vertical pipe section 18 that receives the inlet member 16 is provided with four elongated protrusions 18d that extend horizontally (only two are shown in Figure 4). These protrusions 18d are formed to project radially inward from the large-diameter portion 18a and extend horizontally on the inner circumferential surface of the large-diameter portion 18a. Furthermore, the four protrusions 18d are provided at equal intervals along the inner circumferential surface of the large-diameter portion 18a.

[0043] Here, the spacing between each raised portion 18d (the portion of the inner circumferential surface of the large-diameter portion 18a where no raised portions 18d are provided) is longer than the length of each outer circumferential projection 16d provided on the inlet member 16. Therefore, when the inlet member 16 is inserted from above the large-diameter portion 18a of the main body member 12, each outer circumferential projection 16d of the inlet member 16 passes between each raised portion 18d without engaging with the raised portions 18d of the large-diameter portion 18a. In this state, when the inlet member 16 is rotated counterclockwise when viewed from above within the large-diameter portion 18a, the inclined surface 16e (Figure 6) of the outer circumferential projection 16d of the inlet member 16 comes into contact with one end of the raised portion 18d. When the inlet member 16 is rotated further counterclockwise, the inclined surface 16e of the inlet member 16 is pressed downward by the raised portion 18d.

[0044] On the other hand, as shown in Figure 6, the lower end surface of the inlet member 16 is provided with an annular projection 16f that extends in an annular shape and protrudes downward. This annular projection 16f is formed thinly so that it can be easily deformed. When the inlet member 16 is rotated within the large-diameter section 18a as described above, the inlet member 16 is pressed downward. At this time, the annular projection 16f provided on the lower end surface of the inlet member 16 is pressed against the outer circumference of the stepped section 18c of the vertical pipe section 18 and crushed.

[0045] In this state, each outer peripheral projection 16d (and its inclined surface 16e) of the inlet member 16 engages with each raised portion 18d of the vertical pipe portion 18, and the annular projection 16f of the inlet member 16 is pressed against and crushed by the stepped portion 18c. As a result, the inlet member 16 is connected to the main body member 12 (and its vertical pipe portion 18) without any play. Thus, in this embodiment, the main body member 12 and the inlet member 16 are connected by engagement.

[0046] Next, the fixing structure of the cap member 14 to the main body member 12 will be described. As shown in Figure 5, the bent portion 20 of the main body member 12 is provided with a side opening 20a on a surface facing approximately vertically opposite the horizontal pipe portion 22. This side opening 20a is located on the outer circumference of the curved bent portion 20, on the side facing the horizontal pipe portion 22. A cap member 14 (Figure 7) is connected to the main body member 12 so as to close this side opening 20a.

[0047] The side opening 20a is configured as a roughly rectangular shape with a trapezoidal shape at the bottom. A roughly cylindrical surrounding wall 26 is provided, oriented horizontally, to surround the side opening 20a and extending in the opposite direction to the horizontal pipe section 22. A first stage 26a and a second stage 26b are provided in the middle of this surrounding wall 26. Due to these first and second stage 26a and 26b, the inner diameter of the surrounding wall 26 increases in stages from the side opening 20a outward.

[0048] Furthermore, a first inner circumferential surface 26c, which is a cylindrical surface, extends between the first stage 26a and the second stage 26b, and in this embodiment, this first inner circumferential surface 26c constitutes a curved joint surface. Furthermore, a second inner circumferential surface 26d, which is a cylindrical surface, extends from the second stage 26b to the tip of the enclosing wall 26, and the diameter of the second inner circumferential surface 26d is larger than the diameter of the first inner circumferential surface 26c.

[0049] Furthermore, three engagement receiving portions 26e are provided at equal intervals on the second inner circumferential surface 26d. These engagement receiving portions 26e consist of a substantially rectangular planar portion extending tangentially to the second inner circumferential surface 26d and are formed to protrude radially outward from the second inner circumferential surface 26d. The three engagement receiving portions 26e are provided at intervals of approximately 120 degrees from the axis of the second inner circumferential surface 26d. In addition, each engagement receiving portion 26e is provided with an elongated hole 26f extending in a direction perpendicular to the central axis of the second inner circumferential surface 26d.

[0050] On the other hand, as shown in Figure 7, the cap member 14 has an insertion portion 14a formed in substantially the same cross-sectional shape as the side opening 20a, a first outer peripheral surface 14b provided on the base end side of the insertion portion 14a, and a second outer peripheral surface 14c provided on the base end side of the first outer peripheral surface 14b.

[0051] The insertion portion 14a is the part that is inserted into the side opening 20a when the cap member 14 is attached to the main body member 12. The outer shape of this insertion portion 14a is configured to match the inner wall surface of the bent portion 20 that extends from the side opening 20a. A concave portion 14d is provided on the inside of this insertion portion 14a. When the cap member 14 is connected to the main body member 12, this concave portion 14d is connected to the inner wall surface of the bent portion 20 and is shaped to form part of a circular tubular flow channel that is bent at approximately 90 degrees inside the bent portion 20 (Figure 4).

[0052] In other words, the concave portion 14d of the cap member 14 constitutes a part of the inner wall surface on the outer circumference of the bent pipe inside the drain socket 10. Since this concave portion 14d is a part exposed to the outside of the cap member 14, it can be formed relatively easily by a mold (not shown) when molding the cap member 14. That is, when molding the cap member 14 with a mold, there is no need to provide a parting line or the like on the concave portion 14d. As a result, the shape of the concave portion 14d of the cap member 14 can be formed with high precision, and the inner wall surface on the outer circumference of the bent pipe, which is important for ensuring the performance of the drain socket 10, can be formed with high precision.

[0053] Furthermore, the flow path formed inside the drain socket 10 is divided by the first member, the main body member 12, and the second member, the cap member 14. That is, the inside of the flow path of the drain socket 10 is divided by virtual dividing surfaces 15a, 15b, and 15c surrounded by the edge of the tip of the insertion portion 14a of the cap member 14. As shown in Figure 7, dividing surface 15a is a substantially semicircular plane oriented generally horizontally at the upper end of the insertion portion 14a. Dividing surface 15c is a substantially semicircular plane oriented generally vertically at the lower part of the insertion portion 14a. Dividing surface 15b is a curved surface extending to connect dividing surfaces 15a and 15c. Dividing surface 15a is connected to the upper end of dividing surface 15b at its straight section, and dividing surface 15c is connected to the lower end of dividing surface 15b at its straight section. In this way, the dividing surface inside the flow path of the main body member 12 and the cap member 14 is composed of multiple surfaces.

[0054] Furthermore, the first outer peripheral surface 14b of the cap member 14 is a cylindrical surface provided on the base end side of the insertion portion 14a, and is positioned to face the first inner peripheral surface 26c (Figure 5) of the surrounding wall 26 when the cap member 14 is connected to the main body member 12. In this embodiment, this first outer peripheral surface 14b constitutes a curved connecting surface. This first outer peripheral surface 14b is located outside the insertion portion 14a when viewed from the flow path within the bent portion 20.

[0055] The second outer surface 14c is a cylindrical surface provided on the base end side of the first outer surface 14b, and is positioned to face the second inner surface 26d (Figure 5) of the surrounding wall 26 when the cap member 14 is connected to the main body member 12. This second outer surface 14c has a larger diameter than the first outer surface 14b and is located outside the first outer surface 14b when viewed from the flow path within the bent portion 20.

[0056] Furthermore, a groove 14e is provided on the first outer peripheral surface 14b, and this groove 14e extends around the first outer peripheral surface 14b and has a substantially rectangular cross-section. In addition, an O-ring 28 (Figure 4), which is a sealing member, is received in the groove 14e. That is, the O-ring 28 is positioned between the first outer peripheral surface 14b and the first inner peripheral surface 26c, and when the cap member 14 is coupled to the main body member 12, it is crushed in the groove 14e by the first inner peripheral surface 26c. In this embodiment, an O-ring 28 is used as the sealing member, but as a modification, a packing (not shown) such as a flat packing, V-packing, or U-packing can be used instead of the O-ring.

[0057] This ensures watertightness between the first inner surface 26c of the main body member 12 and the first outer surface 14b of the cap member 14. By providing a groove 14e on the first outer surface 14b and placing the O-ring 28 in it, the O-ring 28 is precisely positioned relative to the cap member 14. As a result, when connecting the cap member 14 to the main body member 12, problems such as the O-ring 28 twisting and reducing watertightness can be prevented.

[0058] Furthermore, as described above, the surrounding wall 26 is provided with a first step portion 26a, and the first inner circumferential surface 26c (Figure 5) provided outside this first step portion 26a and the first outer circumferential surface 14b (Figure 7) of the cap member 14 face each other (Figure 4). A groove portion 14e is provided on the first outer circumferential surface 14b of the cap member 14, and the O-ring 28 is positioned in this groove portion 14e. Therefore, in this embodiment, the O-ring 28 is positioned outside the first step portion 26a when viewed from the flow path inside the drain socket 10. As a result, the O-ring 28 is less likely to come into contact with the cleaning water and dirt flowing through the flow path inside the drain socket 10, and the risk of problems such as foreign matter getting stuck between the O-ring 28 and the first inner circumferential surface 26c can be suppressed.

[0059] Next, as shown in Figure 7, the second outer surface 14c of the cap member 14 is provided with three engaging claws 14f, which are engaging means (only two are shown in Figure 7). These engaging claws 14f are provided at positions corresponding to each engaging receiving portion 26e of the surrounding wall 26, spaced approximately 120 degrees apart at a central angle with respect to the axis of the second outer surface 14c. Furthermore, each engaging claw 14f is formed as a cantilever beam in the roughly rectangular cutouts of the second outer surface 14c at three locations, and is connected to the second outer surface 14c on the side of the first outer surface 14b.

[0060] Furthermore, each engaging claw portion 14f is configured as a substantially rectangular plate extending tangentially to the second outer peripheral surface 14c and is located radially outward from the second outer peripheral surface 14c. When the cap member 14 is coupled to the main body member 12, the engaging claw portions 14f are each received within the engaging receiving portions 26e of the surrounding wall 26. In addition, the tip of each engaging claw portion 14f is bent radially outward from the second outer peripheral surface 14c, thereby forming an elongated engaging projection 14g that protrudes outward.

[0061] When connecting the cap member 14 to the main body member 12, the tip (insertion portion 14a) of the cap member 14 is inserted into the side opening 20a of the main body member 12. As a result, the engaging projection 14g at the tip of each engaging claw portion 14f contacts the inner wall surface of the engaging receiving portion 26e on the second inner circumferential surface 26d, and each engaging claw portion 14f is elastically deformed radially inward. When the insertion portion 14a of the cap member 14 is inserted to a predetermined position in the side opening 20a of the main body member 12, the engaging projection 14g (Figure 7) of each engaging claw portion 14f aligns with the elongated hole 26f (Figure 5) of each engaging receiving portion 26e. As a result, each elastically deformed engaging claw portion 14f returns to its original shape, and the engaging projection 14g of each engaging claw portion 14f is inserted into the elongated hole 26f of each engaging receiving portion 26e (Figure 4).

[0062] As a result, the engaging projections 14g of each engaging claw portion 14f and the elongated holes 26f of each engaging receiving portion 26e engage, preventing the cap member 14 from coming off and fixing it to the main body member 12 by engagement. In other words, the cap member 14 is connected to the main body member 12 by snap fastening. Thus, in this embodiment, the cap member 14 and the main body member 12 are fixed by snap fastening through the engagement of the engaging claw portions 14f and each engaging receiving portion 26e, which are the engaging means. For this reason, the cap member 14 and the main body member 12 can be easily and reliably connected simply by pushing the cap member 14 into the side opening 20a of the main body member 12.

[0063] According to the drain socket 10 of the embodiment of the present invention, since it is composed of a first member, a main body member 12, and a second member, a cap member 14, coupled to the main body member 12, the shape of the pipeline inside the drain socket 10 can be designed relatively freely, and the shape of the pipeline inside can be accurately formed. Furthermore, since the watertightness between the main body member 12 and the cap member 14 is ensured by an O-ring 28, which is a sealing member, the watertightness performance over a long period can be predicted at the design stage, and the watertightness required for the drain socket 10 can be guaranteed over a long period. In addition, since the main body member 12 and the cap member 14 are fixed by engagement, unnecessary burrs or steps are not generated due to excess adhesive, etc., and the internal shape of the pipeline inside the drain socket 10 can be ensured as designed, thus avoiding a decrease in performance caused by the coupling of the members.

[0064] Furthermore, in the drain socket 10 of this embodiment, since the sealing member is positioned outside the flow path area relative to the joint surface between the main body member 12 and the cap member 14, the shape of the flow path can be precisely manufactured.

[0065] Furthermore, according to the drain socket 10 of this embodiment, a groove 14e for receiving the O-ring 28 is provided on the first outer peripheral surface 14b, which is the coupling surface of the cap member 14. This prevents the O-ring 28 from undergoing unnecessary deformation and reducing watertight performance when the main body member 12 and the cap member 14 are joined.

[0066] Furthermore, according to the drain socket 10 of this embodiment, a first stage portion 26a is provided on the joint surface of the main body member 12 and the cap member 14, and the O-ring 28 is positioned outside of this first stage portion 26a. Therefore, only the cleaning water that has passed through the first stage portion 26a reaches the O-ring 28, and debris getting caught in the O-ring 28 can be sufficiently suppressed.

[0067] Furthermore, in the drain socket 10 of this embodiment, since the cap member 14 is connected to the bent portion 20 of the main body member 12, the shape of the inner wall surface of the bent portion 20 can be formed relatively freely by the second member, and a high-performance drain socket 10 can be constructed.

[0068] Furthermore, according to the drain socket 10 of this embodiment, since the cap member 14 is fixed to the outer circumference of the bent portion 20 of the main body member 12, the inner wall surface on the outer circumference of the bent pipe, which is important for ensuring the performance of the drain socket 10, can be formed by the cap member 14, thereby improving the performance of the drain socket 10.

[0069] Furthermore, in the drain socket 10 of this embodiment, the main body member 12 and the cap member 14 are fixed together by the engagement of the engaging claw portion 14f and the elongated hole 26f, which are engaging means provided on each of them, so that the main body member 12 and the cap member 14 can be easily and reliably connected.

[0070] The drain socket according to the embodiment of the present invention has been described above, but various modifications can be made to the above-described embodiment. In particular, the drain socket according to the above-described embodiment constitutes a so-called "S-shaped piping" that connects a drain trap pipe to a drain pipe installed on the floor surface, but the present invention can also be applied to a drain socket that constitutes a so-called "P-shaped piping" that connects a drain trap pipe to a drain pipe installed on the wall surface.

[0071] Furthermore, in the above-described embodiment, the drain socket was constructed by joining a main body member, which is a first component, and a cap member, which is a second component. However, the present invention can be applied to any component constituting the drain socket. Moreover, in the above-described embodiment, the main body member, which is the first component, and the cap member, which is the second component, were engaged and joined by a snap fastener. In contrast, as a modification, the first component and the second component may be engaged by screwing a male thread formed on one of the first component and a female thread formed on the other component. Alternatively, the first component and the second component can be fixed by a third component. That is, the first component and the second component can be engaged by screw fasteners, quick fasteners, clamps, etc. According to this modification, since the first component and the second component are fixed by a third component, the first component and the second component can be firmly and reliably joined. [Explanation of Symbols]

[0072] 1 flush toilet 2 Flush toilet body 4 Bowl section 4a Rim outlet 4b Jet nozzle 6. Drain trap pipe 6a Top 6b Downstream end 8. Washing water tank 10 Drain sockets 12 Main body component (first component) 12a Inlet 12b Outlet 12c leg 12d flange section 14. Cap member (second member) 14a Insertion part 14b 1st outer peripheral surface (bonding surface) 14c 2nd outer surface 14d concave part 14e Groove 14f Engagement claw part (engagement means) 14g engaging protrusion 15a Split plane 15b Split plane 15c split plane 14g engaging protrusion 16 Inlet Member 16a Stepped section 16b Extension 16c fins 16d outer protrusion 16e Slope 16f annular projection 18 Vertical pipe section 18a Large diameter section 18b Small diameter section 18c stepped section 18d ridge 20. Bending section 20a Side opening 22 Horizontal pipe section 24 Exit section 26. Siege Wall 26a 1st stage section 26b Second paragraph 26c 1st inner peripheral surface (bonding surface) 26d 2nd inner surface 26e Engagement receiving part 26f long hole 28 O-ring (sealing component)

Claims

1. A drain socket that connects the drain trap pipe of a flush toilet to the drainage piping installed in the toilet room, A first member that constitutes part of the drain socket described above, A second member is connected to this first member and constitutes a part of the drain socket, A sealing member to ensure watertightness between the first member and the second member, It has, A drain socket characterized in that the dividing surface on the inside of the flow path of the first member and the second member is composed of multiple surfaces, and the first member and the second member are fixed together by engagement.

2. The drain socket according to claim 1, wherein the sealing member is positioned outside the flow path surface of the joint surface between the first member and the second member.

3. The drain socket according to claim 2, wherein the first member or the second member is provided with a groove for receiving the sealing member.

4. The drain socket according to claim 2, wherein a stepped portion is provided on the joint surface of the first member and the joint surface of the second member, and the sealing member is positioned outside the stepped portion.

5. The drain socket according to claim 1, wherein the first member is a bent tubular member, and the second member is connected to the bent portion of the first member.

6. The drain socket according to claim 5, wherein the second member is fixed to the outer circumference of the bent portion of the first member.

7. The drain socket according to claim 1, wherein the first member and the second member are fixed together by the engagement of engaging means provided on each of them.

8. The drain socket according to claim 1, wherein the first member and the second member are fixed by a third member.

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