JP2024060435A - Drainage system - Google Patents

Abstract

[Problem] To provide a drainage device that can improve the watertightness between a piping main body and a connecting member. [Solution] A drainage device 2 includes a cylindrical piping main body 16 having a flat surface 36 formed on a part of its outer circumferential surface and a through hole 38 on the flat surface 36, a cylindrical connecting member 20 that is detachably connected to the flat surface 36 of the piping main body 16 so that its interior communicates with the interior of the piping main body 16 through the through hole 38, and a seal member 22 that seals between the connecting member 20 and the flat surface 36 of the piping main body 16. [Selected Figure] Figure 5

Description

The present invention relates to a drainage device for draining wastewater from a tank body such as a kitchen sink or a wash basin.

Drainage devices for draining wastewater from a tank such as a kitchen sink or washbowl are known. As one such drainage device, Patent Document 1 discloses a drainage device that includes a cylindrical pipe body and an annular nut member. A ring-shaped flange portion that protrudes radially outward from the pipe body is formed on the periphery of the upper opening of the pipe body. A male thread portion is formed on the outer peripheral surface at the upper end of the pipe body. In addition, a female thread portion is formed on the inner peripheral surface of the nut member.

When installing the drainage device disclosed in Patent Document 1 in a tank body, first, the piping body is inserted from above into the drainage outlet formed in the bottom of the tank body, and the flange portion of the piping body is brought into contact with the peripheral portion of the drainage outlet from above. Next, the nut member is passed through the outside of the piping body from below, and the nut member is rotated in a specified direction relative to the piping body to fasten the female thread portion of the nut member and the male thread portion of the piping body. As a result, the nut member comes into contact with the peripheral portion of the drainage outlet from below, and the peripheral portion of the drainage outlet is clamped between the flange portion of the piping body and the nut member.

The above-mentioned drainage device is also known to have a type in which a branch pipe that protrudes radially outward from the outer periphery of the piping body is formed on the outer periphery of the piping body. When installing this type of drainage device in a tank body, there is a risk that when the nut member is passed from below around the outside of the piping body, the nut member and the branch pipe will interfere with each other, making it impossible to fasten the female thread of the nut member to the male thread of the piping body.

As a drainage device for avoiding such interference between the nut member and the branch pipe, Patent Document 2 discloses a drainage device in which the pipe body and the branch pipe are configured separately. In the drainage device disclosed in Patent Document 2, the branch pipe is detachably connected to the outer circumferential surface of the pipe body, and an annular seal member is interposed between the branch pipe and the outer circumferential surface of the pipe body. When installing the drainage device in a tank body, with the branch pipe removed from the outer circumferential surface of the pipe body, a nut member is passed from below around the outside of the pipe body, and the female thread of the nut member is fastened to the male thread of the pipe body. The branch pipe is then connected to the outer circumferential surface of the pipe body. This avoids interference between the nut member and the branch pipe.

Japanese Utility Model Publication No. 6-9094 JP 2020-41574 A

However, in the drainage device disclosed in Patent Document 2, the pipe body is formed in a cylindrical shape, making it difficult to reliably press the seal member against the curved outer peripheral surface of the pipe body over its entire circumference. This creates a problem in that there is a risk of the watertightness between the branch pipe and the outer peripheral surface of the pipe body decreasing.

The present invention aims to solve the above-mentioned problems, and its purpose is to provide a drainage device that can improve the watertightness between the pipe body and the connecting member.

The drainage device according to one aspect of the present invention comprises a cylindrical pipe body having a flat surface formed on a portion of its outer peripheral surface and a through hole in the flat surface, a cylindrical connecting member detachably connected to the flat surface of the pipe body so that the inside of the connecting member communicates with the inside of the pipe body through the through hole, and a sealing member that seals between the connecting member and the flat surface of the pipe body.

The drainage device according to one aspect of the present invention can improve the watertightness between the pipe body and the connecting member.

1 is a diagram showing an application example of the drainage device according to the first embodiment; 1 is a perspective view showing a drainage device according to a first embodiment. FIG. 1 is a side view showing a drainage device according to a first embodiment. FIG. 4 is a cross-sectional view of the drainage device according to the first embodiment taken along line IVA-IVA in FIG. 3. 4B is a cross-sectional view of the drainage device according to embodiment 1 taken along line IVB-IVB in FIG. 4A. FIG. 2 is an exploded perspective view showing the drainage device according to the first embodiment. 4 is a perspective view showing a connecting member and a sealing member of the drainage device according to the first embodiment. FIG. 7 is a perspective view showing a connecting member and a sealing member of the drainage device according to embodiment 1, seen from an angle different from that shown in FIG. 6. 5A to 5C are diagrams for explaining an installation procedure of the drainage device according to the first embodiment. 5A to 5C are diagrams for explaining an installation procedure of the drainage device according to the first embodiment. 5A to 5C are diagrams for explaining an installation procedure of the drainage device according to the first embodiment. 11A and 11B are diagrams illustrating an application example of a drainage device according to a second embodiment. FIG. 11 is a perspective view showing a drainage device according to a second embodiment. 13A and 13B are diagrams illustrating an application example of a drainage device according to a third embodiment.

The drainage device according to the first aspect of the present invention comprises a cylindrical pipe body having a flat surface formed on a portion of its outer peripheral surface and a through hole in the flat surface, a cylindrical connecting member detachably connected to the flat surface of the pipe body so that the inside of the connecting member communicates with the inside of the pipe body through the through hole, and a sealing member that seals between the connecting member and the flat surface of the pipe body.

According to this aspect, a flat surface is formed on a portion of the outer peripheral surface of the pipe body, and the sealing member seals between the connection member and the flat surface of the pipe body. This allows the sealing member to be reliably pressed against the flat surface of the pipe body over its entire circumference, improving the watertightness between the connection member and the flat surface of the pipe body.

In addition, in the drainage device according to the second aspect of the present invention, in the first aspect, an annular flange portion that protrudes radially outward from the connection member is formed on the outer peripheral surface of the connection member, and the sealing member may be formed in an annular shape and configured to seal between the flange portion and the flat surface of the piping body.

According to this aspect, the flange portion of the connection member allows the sealing member to be reliably and easily pressed against the flat surface of the piping body over its entire circumference.

In addition, in the drainage device according to the third aspect of the present invention, in the first or second aspect, a notch is formed on the periphery of the through hole of the piping body, and a protrusion is formed on one end of the connection member that protrudes radially outward from the connection member, and the protrusion may be configured to engage with the inner circumferential surface of the piping body by rotating the connection member in a first direction relative to the piping body with the protrusion inserted into the inside of the piping body through the notch.

According to this aspect, by rotating the connection member in the first direction relative to the piping body, the protrusion engages with the inner peripheral surface of the piping body, so that the connection member can be easily connected to the flat surface of the piping body.

In addition, in the drainage device according to the fourth aspect of the present invention, in the third aspect, an inclined surface is formed on the inner peripheral surface of the piping body, and when the connection member is rotated in the first direction relative to the piping body with the protrusion inserted into the inside of the piping body through the cutout portion, the protrusion rides up onto the inclined surface, thereby engaging with the inclined surface.

According to this aspect, when the protrusion rides up onto the inclined surface, the connection member is pulled into the inside of the piping body through the through hole by a predetermined distance. As a result, the seal member can be compressed between the flange portion of the connection member and the flat surface of the piping body, and the seal member can be reliably and easily pressed against the flat surface of the piping body over its entire circumference.

In addition, in the drainage device according to the fifth aspect of the present invention, in the third or fourth aspect, an engaging portion that protrudes radially outward from the pipe body is formed on the flat surface of the pipe body, and an engaged portion that protrudes radially outward from the pipe body is formed on the outer periphery of the flange portion of the connection member, and when the connection member is rotated in the first direction relative to the pipe body with the protrusion inserted into the inside of the pipe body through the cutout portion, the engaged portion overcomes the engaging portion, thereby restricting rotation of the connection member in a second direction, which is the opposite direction to the first direction, relative to the pipe body.

According to this aspect, the engaged portion overcomes the engaging portion, restricting rotation of the connection member in the second direction relative to the piping body, so that the protrusion can be maintained engaged with the inner circumferential surface (including the inclined surface) of the piping body.

The following describes the embodiment in detail with reference to the drawings.

The embodiments described below are all comprehensive or specific examples. The numerical values, shapes, materials, components, component placement and connection forms, steps, and order of steps shown in the following embodiments are merely examples and are not intended to limit the present invention. Furthermore, among the components in the following embodiments, components that are not described in an independent claim that indicates a superordinate concept are described as optional components.

(Embodiment 1)
[1. Application examples of drainage equipment]
First, an application example of the drainage device 2 according to the first embodiment will be described with reference to Fig. 1. Fig. 1 is a diagram showing an application example of the drainage device 2 according to the first embodiment.

As shown in FIG. 1, in this embodiment, the drainage device 2 is applied as a drainage trap for draining wastewater from a multi-basin sink 4 installed in, for example, a kitchen. The multi-basin sink 4 includes a first basin body 6 and a second basin body 8 adjacent to each other.

A circular first drain outlet 10 is formed at the bottom of the first tank body 6. The drainage device 2 is installed in this first drain outlet 10. Wastewater from the first tank body 6 flows down inside the drainage device 2 through the first drain outlet 10.

A circular second drain outlet 12 is formed at the bottom of the second tank body 8. A branch pipe 14 extending in a roughly L-shape is installed in this second drain outlet 12. One end of the branch pipe 14 is connected to the second drain outlet 12, and the other end of the branch pipe 14 is connected to the side of the drainage device 2. The drainage water from the second tank body 8 flows laterally through the inside of the branch pipe 14 through the second drain outlet 12, and then flows into the inside of the drainage device 2 and flows down inside the drainage device 2.

[2. Configuration of the drainage device]
Next, the configuration of the drainage device 2 according to the first embodiment will be described with reference to Figs. 2 to 7. Fig. 2 is a perspective view showing the drainage device 2 according to the first embodiment. Fig. 3 is a side view showing the drainage device 2 according to the first embodiment. Fig. 4A is a cross-sectional view of the drainage device 2 according to the first embodiment taken along line IVA-IVA in Fig. 3. Fig. 4B is a cross-sectional view of the drainage device 2 according to the first embodiment taken along line IVB-IVB in Fig. 4A. Fig. 5 is an exploded perspective view showing the drainage device 2 according to the first embodiment. Fig. 6 is a perspective view showing the connection member 20 and the seal member 22 of the drainage device 2 according to the first embodiment. Fig. 7 is a perspective view showing the connection member 20 and the seal member 22 of the drainage device 2 according to the first embodiment, as viewed from an angle different from that of Fig. 6.

In addition, in Figures 2 to 5, the axial direction of the connection member 20 is the X-axis direction, the axial direction of the piping body 16 is the Z-axis direction, and the direction perpendicular to the axial directions of the connection member 20 and the piping body 16 is the Y-axis direction. In addition, the positive side in the Z-axis direction is expressed as "upper", "upper side", "above", etc., and the negative side in the Z-axis direction is expressed as "lower", "lower side", "below", etc.

As shown in Figures 2 to 5, the drainage device 2 includes a pipe body 16, a nut member 18, a connection member 20, and a sealing member 22.

The piping body 16 has a first body portion 24, a flange portion 26, a second body portion 28, and a water seal forming portion 30.

The first body 24 is formed in a cylindrical shape. A male thread 32 is formed on the outer peripheral surface at the upper end of the first body 24. The male thread 32 is formed around the entire circumference of the first body 24 in the circumferential direction. As shown in FIG. 2 and FIG. 4A, the outer peripheral surface of the first body 24 has a cylindrically curved curved surface 34 and a flat surface 36 formed in a flat shape. That is, the flat surface 36 is formed on a part of the outer peripheral surface of the first body 24. The flat surface 36 is a plane perpendicular to the connection direction (X-axis direction) of the connection member 20, and extends along the axial direction (Z-axis direction) of the first body 24.

As shown in FIG. 5, a substantially circular through hole 38 is formed in the flat surface 36. A pair of notches 40, 42 are formed in the periphery of the through hole 38. The pair of notches 40, 42 are disposed on opposite sides of the radial center of the through hole 38.

As shown in FIG. 5, the flat surface 36 is formed with an engagement portion 44 that protrudes radially outward from the first body portion 24. The engagement portion 44 is formed, for example, with a triangular cross section, and is disposed near the through hole 38.

As shown in (a) and (b) of FIG. 9 described later, an inclined surface 46 is formed on the inner peripheral surface of the first main body portion 24. The inclined surface 46 is disposed near the through hole 38, and is formed so as to incline upward from the inner peripheral surface of the first main body portion 24 as it moves away from the through hole 38.

The flange portion 26 protrudes in an annular shape from the periphery of the upper opening of the first main body portion 24 radially outward from the first main body portion 24. The male thread portion 32 is formed on the outer peripheral surface of the first main body portion 24 below the flange portion 26.

The second body portion 28 is formed in a cylindrical shape and extends downward from the lower end of the first body portion 24. The outer diameter of the second body portion 28 is smaller than the outer diameter of the first body portion 24. A drain pipe (not shown) is detachably connected to the second body portion 28.

As shown in FIG. 4B, the water seal forming section 30 has a water seal tube 48 and a bowl 50. The water seal tube 48 is formed in a cylindrical shape and is arranged inside the first main body section 24. The water seal tube 48 extends upward from the lower end of the first main body section 24, and the inside of the water seal tube 48 is connected to the insides of the first main body section 24 and the second main body section 28. The bowl 50 is arranged so as to cover the water seal tube 48 from above. The water seal tube 48 and the bowl 50 allow water seal 52 to accumulate inside the first main body section 24. This water seal 52 suppresses the backflow of odors and the intrusion of insects from the drain pipe connected to the second main body section 28 to the first drain outlet 10 (see FIG. 1).

As shown in FIG. 2, the nut member 18 has a nut body 54, a flange 56, and a number of rib pieces 58. The nut body 54 is formed in an annular shape, and a female thread 60 is formed on the inner peripheral surface of the nut body 54. The female thread 60 is formed around the entire circumference of the nut body 54 in the circumferential direction. The flange 56 protrudes in an annular shape from the peripheral edge of the upper opening of the nut body 54 radially outward from the flange 56. The multiple rib pieces 58 are formed on the outer peripheral surface of the nut body 54 and are arranged at equal intervals along the circumferential direction of the nut body 54.

As shown in Figures 2 to 5, the connection member 20 is detachably connected to the flat surface 36 of the piping body 16 so that its interior (hollow) communicates with the interior (hollow) of the piping body 16 through the through hole 38. The branch pipe 14 (see Figure 1) is detachably connected to the connection member 20. That is, in this embodiment, the connection member 20 is used as a branch pipe for merging the drainage water from the branch pipe 14 with the drainage water flowing through the piping body 16. As shown in Figures 6 and 7, the connection member 20 has a connection body portion 62, a pair of protrusions 64, 66, a flange portion 68, and an engaged portion 70.

The connection body 62 is formed in a cylindrical shape, and the inside of the connection body 62 is connected to the inside of the piping body 16 through the through hole 38. The outer diameter of the connection body 62 is smaller than the outer diameter of the through hole 38 of the piping body 16 by, for example, about 1 mm. Each of the pair of protrusions 64, 66 protrudes radially outward from the outer peripheral surface at one end of the connection body 62 (the end closer to the piping body 16). The pair of protrusions 64, 66 are arranged on opposite sides to each other with respect to the radial center of the connection body 62. The flange portion 68 protrudes in a circular ring shape radially outward from the outer peripheral surface near one end of the connection body 62. In addition, the flange portion 68 is arranged on the other end (the end farther from the piping body 16) side of the pair of protrusions 64, 66 in the axial direction of the connection body 62. The engaged portion 70 protrudes radially outward from the outer periphery of the flange portion 68 in a generally L-shaped manner from the connection body portion 62.

The seal member 22 is an annular seal member, and is made of a material having elastic restoring force, such as a rubber material. Specifically, the seal member 22 is made of a packing, such as an O-ring. As shown in FIGS. 5 to 7, the seal member 22 is arranged along the circumferential direction of the side surface (the side surface closer to the pair of protrusions 64, 66) of the flange portion 68 of the connection member 20. As shown in FIGS. 4A and 4B, when the connection member 20 is connected to the flat surface 36 of the piping body 16, the seal member 22 is compressed between the flange portion 68 of the connection member 20 and the flat surface 36 of the piping body 16, thereby sealing (watertightening) between the flange portion 68 of the connection member 20 and the flat surface 36 of the piping body 16.

[3. Drainage device installation procedure]
Next, a procedure for installing the drainage device 2 according to the first embodiment will be described with reference to Figures 8 to 10. Figures 8 to 10 are diagrams for explaining the procedure for installing the drainage device 2 according to the first embodiment.

First, as shown in (a) of FIG. 8, with the connection member 20 removed from the flat surface 36 of the piping body 16, the first body portion 24 of the piping body 16 is inserted from above into the first drain outlet 10 of the first tank body 6, and the flange portion 26 of the piping body 16 is brought into contact with the peripheral portion of the first drain outlet 10 from above. At this time, the orientation of the flat surface 36 of the piping body 16 is adjusted so that the flat surface 36 of the piping body 16 faces the installation direction of the branch piping 14 (see FIG. 1).

8(a) and (b), the nut member 18 is passed from the lower end of the second body 28 to the outside of the first body 24, and the nut member 18 is brought close to the upper end of the first body 24. At this time, since the connection member 20 is removed from the flat surface 36 of the piping body 16, interference between the nut member 18 and the connection member 20 can be avoided. Next, the nut member 18 is rotated in a predetermined direction relative to the first body 24 to fasten the female thread portion 60 (see FIG. 2) of the nut member 18 and the male thread portion 32 of the first body 24. The nut member 18 can be easily rotated relative to the first body 24 by hooking a finger on the rib piece 58 of the nut member 18.

By fastening the female threaded portion 60 of the nut member 18 and the male threaded portion 32 of the first main body portion 24 in this manner, the flange portion 56 of the nut member 18 comes into contact with the peripheral portion of the first drain outlet 10 from below. As a result, as shown in FIG. 8(b), the peripheral portion of the first drain outlet 10 is clamped from above and below between the flange portion 26 of the piping main body 16 and the flange portion 56 of the nut member 18, and the piping main body 16 is fixed to the first drain outlet 10. For convenience of explanation, the nut member 18 is omitted from illustration in FIG. 9 and FIG. 10.

Next, as shown in FIG. 9(a) and FIG. 10(a), the pair of protrusions 64, 66 of the connection member 20 are inserted into the first body portion 24 of the piping body 16 through the pair of cutouts 40, 42 of the first body portion 24. As a result, one end of the connection body portion 62 of the connection member 20 is inserted into the first body portion 24 through the through hole 38. At this time, the seal member 22 arranged on the flange portion 68 of the connection member 20 comes into contact with the peripheral portion of the through hole 38 on the flat surface 36 of the first body portion 24.

In this state, as shown in FIG. 9B, the connection body 62 of the connection member 20 is rotated in a first direction (the direction indicated by the arrow P in FIG. 9B) relative to the first body 24 of the piping body 16. As a result, each of the pair of protrusions 64, 66 is engaged with the periphery of the through hole 38 on the inner peripheral surface of the first body 24. At this time, the protrusion 66 rides up onto the inclined surface 46 formed on the inner peripheral surface of the first body 24, and the protrusion 66 is engaged with the inclined surface 46. Accordingly, the connection body 62 of the connection member 20 is pulled into the first body 24 by a predetermined distance (for example, about 1 to 2 mm) through the through hole 38. As a result, the seal member 22 is sandwiched in a compressed state between the flange portion 68 of the connection member 20 and the flat surface 36 of the piping body 16, thereby sealing between the flange portion 68 of the connection member 20 and the flat surface 36 of the piping body 16.

In addition, when the connection body portion 62 of the connection member 20 is rotated in a first direction (indicated by arrow P in FIG. 10(b)) relative to the first body portion 24 of the piping body 16 from the state shown in FIG. 10(a) to the state shown in FIG. 10(b), the engaged portion 70 climbs over the engaging portion 44. This restricts rotation of the connection member 20 in a second direction (indicated by arrow Q in FIG. 10(b)), which is the opposite direction to the first direction relative to the piping body 16, so that the protrusion 66 of the connection member 20 can be maintained in a state engaged with the inclined surface 46 of the piping body 16.

In this manner, the connection member 20 is connected to the flat surface 36 of the piping body 16, and the installation of the drainage device 2 to the first tank body 6 is completed.

[4. Effects]
As described above, in this embodiment, the seal member 22 seals between the flange portion 68 of the connection member 20 and the flat surface 36 of the pipe body 16. This allows the seal member 22 to be reliably pressed against the flat surface 36 of the pipe body 16 over its entire circumference, improving the watertightness between the flange portion 68 of the connection member 20 and the flat surface 36 of the pipe body 16.

In this embodiment, the drainage device 2 is applied as a drainage trap for draining wastewater from a multi-basin sink 4, but is not limited to this. For example, the drainage device 2 may be applied as a drainage trap for draining wastewater from a washbasin (basin body) installed in a bathroom. In this case, the connection member 20 is applied as a branch pipe for merging the wastewater from the overflow pipe connected to the overflow opening of the washbasin with the wastewater flowing through the pipe body 16.

(Embodiment 2)
An application example of the drainage device 2A according to the second embodiment will be described with reference to Fig. 11. Fig. 11 is a diagram showing an application example of the drainage device 2A according to the second embodiment. In each of the following embodiments, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 11, in this embodiment, the drainage device 2A is used as a drain for draining wastewater from a tank body 72, which is a self-contained sink installed in a kitchen or the like. A circular drain outlet 73 is formed in the bottom of the tank body 72. The drainage device 2A is installed in this drain outlet 73.

A straight drain pipe 78 is connected to the connection member 20 of the drainage device 2A via a substantially L-shaped drain pipe 74 and a substantially S-shaped trap pipe 76. That is, in this embodiment, the connection member 20 is used as a branch pipe for flowing the drainage water from the piping main body 16A laterally toward the drain pipe 74.

The drainage water from the tank body 72 flows into the inside of the drainage device 2A through the drain outlet 73, and then flows laterally inside the drain pipe 74. The drainage water that flows inside the drain pipe 74 flows into the drain pipe 78 via the trap pipe 76. In this way, by connecting the drain pipe 74 to the side of the drainage device 2A, storage space for the kitchen, etc. can be secured below the tank body 72.

The configuration of the drainage device 2A according to the second embodiment will be described with reference to FIG. 12. FIG. 12 is a perspective view showing the drainage device 2A according to the second embodiment.

As shown in FIG. 12, in this embodiment, the configuration of the piping body 16A of the drainage device 2A is different from that of the above-mentioned embodiment 1. Specifically, the piping body 16A has only the first body portion 24A and the flange portion 26, and does not have the second body portion 28 and the water seal forming portion 30 described in the above-mentioned embodiment 1. The first body portion 24A is formed in a bottomed cylindrical shape with an open upper end and a closed lower end.

Therefore, in this embodiment, the same effect as in the first embodiment can be obtained.

(Embodiment 3)
An application example of the drainage device 2B according to the third embodiment will be described with reference to Fig. 13. Fig. 13 is a diagram showing an application example of the drainage device 2B according to the third embodiment.

As shown in FIG. 13, in this embodiment, the drainage device 2B is applied as a drainer for draining wastewater from a tank body 80, which is a washbasin installed in a washroom, for example. A circular drain outlet 82 is formed in the bottom of the tank body 80. The drainage device 2B is installed in this drain outlet 82. A drain plug 84 is also arranged in the drain outlet 82 so that it can be opened and closed. The drain plug 84 is connected to an operating unit 86 arranged at the upper end of the tank body 80 via an interlocking mechanism 88.

The interlocking mechanism 88 links the lifting and lowering movement of the operating unit 86 with the opening and closing movement of the drain plug 84. Specifically, when the user pulls the operating unit 86 upward relative to the tank body 80, the interlocking mechanism 88 opens the drain plug 84 in conjunction with the lifting movement of the operating unit 86. This causes the drain outlet 82 to be opened by the drain plug 84. Also, when the user presses the operating unit 86 downward relative to the tank body 80, the interlocking mechanism 88 closes the drain plug 84 in conjunction with the lowering movement of the operating unit 86. This causes the drain outlet 82 to be blocked by the drain plug 84.

A part of the interlocking mechanism 88 is disposed inside each of the piping body 16B and the connection member 20B of the drainage device 2B. That is, in this embodiment, the connection member 20B is used as an attachment structure for connecting the piping body 16B and the operating unit 86 via the interlocking mechanism 88.

Although detailed illustrations are omitted, the piping body 16B has the same configuration as the piping body 16 described in the first embodiment above. Therefore, the same effects as those of the first embodiment can be obtained in this embodiment as well. Although illustrations are omitted, the drainage device 2B can be used not only as the drainer described above, but also as a drainage trap for draining wastewater from the tank body 80, for example.

(Modifications, etc.)
Although the drainage device according to one or more aspects has been described based on the above-mentioned embodiments, the present invention is not limited to the above-mentioned embodiments. As long as it does not deviate from the spirit of the present invention, various modifications conceived by a person skilled in the art to the above-mentioned embodiments and forms constructed by combining components in different embodiments may also be included within the scope of one or more aspects.

The drainage device according to the present invention can be used, for example, as a drainage trap for draining wastewater from a multi-tank sink installed in a kitchen, etc.

Reference Signs List 2, 2A, 2B Drainage device 4 Multi-tank sink 6 First tank body 8 Second tank body 10 First drain outlet 12 Second drain outlet 14 Branch pipe 16, 16A, 16B Pipe body 18 Nut member 20, 20B Connection member 22 Seal member 24, 24A First body portion 26, 56, 68 Flange portion 28 Second body portion 30 Water seal forming portion 32 Male thread portion 34 Curved surface 36 Flat surface 38 Through hole 40, 42 Notch portion 44 Engagement portion 46 Inclined surface 48 Water seal cylinder 50 Bowl 52 Water seal 54 Nut body portion 58 Rib piece 60 Female thread portion 62 Connection body portion 64, 66 Projection portion 70 Engaged portion 72, 80 Tank body 73, 82 Drain outlet 74, 78 Drain pipe 76 Trap pipe 84 Drain plug 86 Operation portion 88 Interlocking mechanism

Claims (5)

A cylindrical pipe body having a flat surface formed on a part of an outer circumferential surface and a through hole formed in the flat surface;
A cylindrical connection member that is detachably connected to the flat surface of the piping main body so that the inside of the cylindrical connection member communicates with the inside of the piping main body through the through hole;
a sealing member that seals between the connecting member and the flat surface of the piping main body. An annular flange portion is formed on an outer circumferential surface of the connection member so as to protrude radially outward from the connection member,
The drainage device according to claim 1 , wherein the seal member is formed in an annular shape and seals between the flange portion and the flat surface of the pipe body. A notch is formed on the periphery of the through hole of the piping body,
A protrusion is formed on one end of the connection member so as to protrude radially outward from the connection member,
The drainage device described in claim 2, wherein the protrusion is inserted into the inside of the piping body through the cutout portion and the connecting member is rotated in a first direction relative to the piping body, thereby engaging the protrusion with the inner surface of the piping body. An inclined surface is formed on the inner circumferential surface of the piping body,
The drainage device described in claim 3, wherein when the connection member is rotated in the first direction relative to the piping body with the protrusion inserted into the inside of the piping body through the cutout portion, the protrusion rides up onto the inclined surface, thereby engaging with the inclined surface. An engagement portion protruding radially outward of the pipe body is formed on the flat surface of the pipe body,
an engaged portion is formed on an outer periphery of the flange portion of the connection member, the engaged portion protruding radially outward of the connection member,
A drainage device as described in claim 3 or 4, wherein when the connecting member is rotated in the first direction relative to the piping body with the protrusion inserted into the inside of the piping body through the cutout portion, the engaged portion overcomes the engaging portion, thereby restricting rotation of the connecting member in a second direction, which is the opposite direction to the first direction, relative to the piping body.

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