JPH1136403A - Draining device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that storage space inside a cabinet at a washstand or a kitchen sink is reduced by a drain pipe trap located inside the cabinet and by a drain pipe that descends following the trap, reducing the capacity and obstructing articles when they are put into and out of the cabinet. SOLUTION: A draining device is designed so that a cylindrical drain hole member 28 which is inserted into an opening 26 in the bottom of a washbowl 12 to constitute a drain hole is secured to the bottom of the washbasin 12 by clamping a clamp nut 36 from the back of the washbowl 12 against the externally threaded part 34 of the drain hole member 28, and so that a drain pipe trap 52 is connected to the drain hole member 28 at the underside of the washbowl 12. A dip part 62 in the bottom of the drain pipe trap 52 is formed into a flat shape with a horizontally elongated cross-sectional form and into a straight shape extending in a straight line without being substantially curved in the horizontal direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drainage device for draining water from the bottom of a water tank such as a washbasin or a sink, and more particularly to a drainage device provided with a drainpipe trap.

[0002]

2. Description of the Related Art
A drainage device in a kitchen sink or vanity sink is an S-shaped bent portion of a cylindrical drain port member that is inserted into a bottom opening of a water tank such as a washbasin or a sink and that forms a drain port of the water tank. Drain trap was connected.

FIG. 11 shows a conventional example of a drainage device for a vanity stand. In the figure, reference numeral 200 denotes a washbasin in a vanity stand, which has an opening formed at the bottom and a cylindrical drainage fitting (drainage member) having a flange 202 at the upper end as shown in FIG. 204 is inserted downward from the upper side.

The drainage fitting 204 has a male thread portion 206 on the outer peripheral surface of the lower end portion.
On the lower side of the basin 200, a fastening nut 208 is screwed. The drainage fitting 204 is watertightly fixed to the bottom of the basin 200 via the packing 210 by the tightening force of the tightening nut 208.

[0005] A connection pipe 212 is connected to the lower side of the drainage fitting 204 by a cap nut 214, and a drain pipe trap 216 having an S-shaped shape is connected to the connection pipe 212. The upper end is connected by a cap nut 217.

That is, in this example, the drain trap 21
Reference numeral 6 denotes a drain pipe fitting 20 at the upper end through a connection pipe 212.
4 is connected. The drain trap 216 has a bottom dip portion 216A, an outflow leg 216B extending upward from the bottom dip portion 216A, and a wear portion 216C serving as an overflow portion. Then, following the wear section 216C, the drain pipe 21
8 extends downward.

As shown in FIG. 11, the drain trap 216 is located at a substantially middle portion in the front-rear direction inside the cabinet 220.
16 extends downward to a position relatively close to the bottom plate 222 of the cabinet 220, so that the drain trap 2
The space between the cabinet 16 and the bottom plate 222 is narrowed, so that the storage space inside the cabinet 220 is narrowed, so that the storage amount of the goods in the cabinet 220 is necessarily limited, and at the same time, the goods can be discharged to the cabinet 220. There was a problem that the putting work became difficult.

In addition, the drain pipe 218 is
6, the drain pipe 218 extends downward at an intermediate position in the front-rear direction inside the cabinet 220.
Also, this is a factor that hinders the storage of articles in the storage space inside the cabinet 220.

[0009]

The drainage device according to the present invention has been devised to solve such a problem. According to the first aspect of the present invention, there is provided a drainage device which is inserted into a bottom opening of a water tub such as a basin or a sink, and is provided with a male screw portion of a cylindrical drain port member which constitutes a drainage port of the water tub. A drain device comprising a drain nut fixed to the bottom of the water tank by tightening a tightening nut, and a drain trap connected to the drain member below the water tank.
The dip portion at the bottom of the drain pipe trap has a straight portion that extends straight in a non-curved state in a substantially horizontal direction.

The drainage device according to the second aspect of the present invention is arranged such that the drainage device is inserted into a bottom opening of a water tub such as a basin or a sink, and is provided with a male screw portion of a tubular drainage member constituting a drainage port of the water tub. A drain device comprising a drain nut fixed to the bottom of the water tank by tightening a tightening nut, and a drain trap connected to the drain member below the water tank. The lower bottom surface of the dip portion is flat.

According to a third aspect of the present invention, there is provided a drainage device, comprising: A drain device comprising a drain nut fixed to the bottom of the water tank by tightening a tightening nut, and a drain trap connected to the drain member below the water tank. Dip part,
A straight portion extending straight in a substantially non-curved state in a substantially horizontal direction is provided, and the lower bottom surface of the dip portion is a flat surface.

A drainage device according to a fourth aspect of the present invention is characterized in that, in any one of the first to third aspects, the cross section of the dip portion in the drain pipe trap has a horizontally long flat shape.

According to a fifth aspect of the present invention, there is provided a drainage device which is inserted into a bottom opening of a water tank such as a basin or a sink, and is provided with a male screw portion of a cylindrical drainage port member which constitutes a drainage port of the water tank. In a drainage device comprising: fastening a drain nut to fix the drain member to the bottom of the water tank, and connecting a drain trap to the drain member below the water tank, the tightening nut may have an inner diameter. Is characterized in that a male screw pipe portion larger than the outer diameter of the drain port member is integrally formed, and the upper end of the drain pipe trap is screwed to the male screw portion with a cap nut.

According to a sixth aspect of the present invention, there is provided a drainage device which is inserted into a bottom opening of a water tank such as a wash basin or a sink, and is provided with a male screw portion of a cylindrical drain port member which constitutes a drainage port of the water tank. A drainage device comprising a drain nut having a drain nut fixed to the bottom of the water tank by tightening a tightening nut and a drain trap connected to the drain member below the water tank. An annular groove is formed at the upper end of the drain pipe trap, and an upwardly extending annular projection is formed at the upper end of the drain pipe trap. The upper end of the drainpipe trap is connected by a connecting member.

According to a seventh aspect of the present invention, there is provided the drainage device according to the sixth aspect, wherein the tightening nut and the upper end portion of the drain pipe trap are mounted over their outer peripheral surfaces, and are connected by the connecting member that tightens the outer peripheral surfaces. It is characterized by having done.

According to an eighth aspect of the present invention, in the drainage device according to the seventh aspect, the connecting member is an elastic ring, and tightens and connects the tightening nut and the upper end of the drain pipe trap based on elastic force. It is characterized by.

According to a ninth aspect of the present invention, in the drainage device according to the seventh aspect, the connecting member comprises a clamp member having a clamp mechanism.

According to a tenth aspect of the present invention, there is provided the drainage device according to any one of the sixth to ninth aspects, wherein an engagement groove extending in a circumferential direction is formed along the outer peripheral surface of the tightening nut and the upper end of the drain pipe trap. On the other hand, the connecting member is provided with an engaging portion that engages with the engaging groove.

[0019]

As described above, the drain device according to the first aspect of the present invention has a configuration in which the bottom dip portion of the drain pipe trap has a straight portion that extends straight in a substantially non-curved state in a horizontal direction. In the case of this drainage device, the upright position of the outflow leg from the dip portion can be shifted rearward due to the presence of the straight portion, and therefore the drainage pipe following the outflow leg and the wear portion can be moved. When extending downward, the position of the drainpipe can be shifted backward in the cabinet, and more storage space can be secured in the front of the downward drainpipe inside the cabinet.

Further, since the downward drainpipe can be located at the rear side in the cabinet, the problem that the drainpipe impedes access to articles can be eliminated or reduced.

According to a second aspect of the present invention, there is provided a drainage device wherein the lower bottom surface of the bottom dip portion of the drainage pipe trap is made flat, and the lower end position of the drainage pipe trap is shifted upward. Therefore, a larger space below the drain trap can be ensured inside the cabinet. That is, the storage space below the drain pipe trap in the cabinet can be made wider.

According to a third aspect of the present invention, there is provided a drainage device in which the bottom portion of the drainpipe trap has the above-mentioned straight portion and the lower bottom surface is flat. Can be more effectively secured widely, and the storage space in the cabinet can be more easily used.

Here, in the drainage device according to any one of the first to third aspects, the cross-sectional shape of the dip portion may be a horizontally long flat shape. Usually, the drain pipe trap has a circular cross-sectional shape, but according to Claim 4, the lower end position of the drain pipe trap is formed by making the cross-sectional shape of the dip portion in the drain pipe trap a horizontally long flat shape. It can be shifted upward. In this case, the cross-sectional shape of the dip portion may be a horizontally long rectangular shape.

According to a fifth aspect of the present invention, in the drainage device, an externally threaded pipe portion is formed integrally with the tightening nut, and the upper end of the drainage pipe trap is screwed to the externally threaded portion of the externally threaded pipe portion with a cap nut. In the case of this device, the connecting pipe 212 shown in FIG. 12 can be omitted, and the entire position of the drain pipe trap can be brought upward by that much. Therefore, according to the drainage device of the fifth aspect, it is possible to secure a wide storage space under the drainpipe trap.

According to a sixth aspect of the present invention, there is provided a drainage device, wherein a downward annular groove is formed in the tightening nut, while an upward annular protrusion is formed at the upper end of the drain pipe trap to fit them in a watertight manner. In this state, the fastening nut and the upper end of the drain pipe trap are connected by a connecting member. In this drain device, the connecting pipe 212 shown in FIG. 12 can be omitted, and the position of the drain pipe trap is held upward. Can come. This makes it possible to secure a wider storage space below the drain pipe trap.

In this case, the tightening nut and the upper end portion of the drain pipe trap can be connected in a state where the outer peripheral surfaces are tightened by a connecting member mounted over the outer peripheral surfaces thereof. ).

When connecting the tightening nut and the upper end of the drain pipe trap by tightening with such a connecting member, an elastic ring is used as the connecting member, and the outer peripheral surface is tightened based on the elastic force. The attached nut and the upper end of the drain pipe trap can be connected (claim 8). This makes it possible to easily connect the tightening nut to the upper end of the drain pipe trap.

Alternatively, a clamp member having a clamp mechanism can be used as the connecting member. By using a clamp member having such a clamp mechanism as a connecting member, the tightening nut and the upper end of the drain trap can be more firmly connected.

According to a tenth aspect of the present invention, the engaging nut and the upper end of the drain pipe trap are formed with a circumferentially extending engaging groove along the outer peripheral surface, and the connecting member side has the engaging groove formed therein. In this drainage device, the upper end of the drain pipe trap is firmly attached to the tightening nut based on the engagement between the engagement groove and the engagement portion. Can be connected.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described in detail with reference to the drawings. In FIG. 1, reference numeral 10 denotes a vanity table, 12 denotes a washbasin, 14 denotes a faucet, 16 denotes a cabinet below the washbasin 12, and 18 denotes a riser. 20 is cabinet 1
6 is a bottom plate, 22 is its back plate, and 24 is an openable / closable door.

FIG. 2 shows a main structure of a drainage device for discharging drainage from the basin 12 to the outside. As shown in FIG. 2, an opening 26 is provided at the bottom of the basin 12.
A cylindrical drainage fitting (drainage member) 28 is inserted into the opening 26 downward from above.

The drain fitting 28 has a flange portion 30 at the upper end, and the flange portion 30 is brought into contact with a tapered surface 32 formed at the bottom of the basin 12.

The drainage fitting 28 has a male screw portion 34 on the outer peripheral surface of the lower end portion, and the tightening nut 3 is attached to the male screw portion 34.
6 is screwed. Then, based on the tightening force of the tightening nut 36, the drainage fitting 28 is mounted on the packing 37, 38.
Is fixed to the bottom of the basin 12 in a watertight manner.

The drain fitting 28 constitutes a drain at the bottom of the basin 12, and has a stopper 15 for opening and closing the drain at the upper end thereof. In the figure, an inlet 40 is formed in the peripheral wall. The inflow port 40 is for allowing water overflowed from an overflow hole (not shown) at the upper end of the basin 12 to flow into the drainage fitting 28.

The upper portion of the tightening nut 36 is a nut main body portion 42 having a polygonal tool engaging portion on the outer peripheral surface, while the lower side is a male screw tube portion 44, and a male screw portion 48 is formed on the outer peripheral surface. Is formed. That is, in the present embodiment, the tightening nut 36 has a form in which the male screw tube portion 44 is integrally formed.

The tightening nut 36 has an internal thread 46 formed on the inner peripheral surface over the entire length in the axial direction.
6 is screwed into the male screw portion 34 of the drainage fitting 28.

On the other hand, a cap nut 50 is screwed into the outer peripheral surface of the male screw pipe section 44, and the cap nut 50
The upper end of the drain pipe trap 52 having an S-shaped shape is connected and fixed to the tightening nut 36.

Specifically, an outward flange portion 56 at the upper end of the drain pipe trap 52 is engaged with the engaging portion 54 of the cap nut 50.
The drain pipe trap 52 is connected and fixed to the tightening nut 36, that is, to the drainage fitting 28 in a state where the drain pipe trap 52 is pressed against the lower end surface of the tightening nut 36 via the pipe connecting packing 58. I have.

The drain pipe trap 52 is provided with an inflow leg 60.
And a dip portion 62 at the bottom, an outflow leg 64 rising from the bottom portion, and a wear portion 66 serving as an overflow portion. A drainage pipe 68 follows the wear portion 66 and falls downward. The drain pipe 68 penetrates the bottom plate 20 of the cabinet 16 and is connected to an external pipe.

In the figure, reference numeral 72 designates an integral trap body, in which the inflow leg 60, the dip portion 62 and a part of the outflow leg 64 are formed.

Numeral 74 denotes a pipe body integrally having a drain pipe 68,
The other part of the outflow leg 64 and the wear part 66 are formed on the tube 74 side. The circular end of the tubular body 74 is inserted into the inner surface of the corresponding circular end of the trap body 72, and the cap nut 78 is inserted into the external thread 76 formed on the outer peripheral surface of the end of the trap body 72. By screwing in,
The end of the tube 74 and the end of the trap body 72 are
They are watertightly connected to each other via a packing 58.

The inflow leg 6 in the drain pipe trap 52
No. 0 has a circular cross section with a large diameter as shown in FIG. 3 (A), and the outflow leg 64 similarly has a cross sectional shape as shown in FIG. 3 (C). Circular and inflow leg 6
The diameter is smaller than that of 0.

On the other hand, as shown in FIGS. 4 and 5, the dip portion 62 has a straight form extending entirely in the horizontal direction, and its cross-sectional shape is as shown in FIG. As shown in the figure, the section has a rectangular shape with a horizontally long flat shape.

That is, in the present example, the dip portion 62 is almost entirely a straight portion, and the upper and lower surfaces are flat surfaces. Furthermore, the dip part 62
The shape is such that the width gradually decreases from the large-diameter inflow leg 60 to the small-diameter outflow leg 64. FIG.
4 and 70, a drain port 70 is normally closed by a cap.

In the case of the drainage device of this embodiment, almost the entirety of the dip portion 62 is formed in a straight form that extends straight in the horizontal direction. A drain 68 extending downward from 52 can be located at a rearward position near the back plate 22 in the cabinet 16, thus ensuring a large storage space inside the cabinet 16 in front of the downward drain 68. Can be.

Further, the dip portion 62 of the drain pipe trap 52 has a horizontally long flat cross section and a flat bottom surface, so that the lower end position of the drain pipe trap 52 is Therefore, the space below the drain pipe trap 52 can be more widely secured inside the cabinet 16. Further, in the case of this drain trap 52,
A large amount of water can be stored in the dip portion 62, and it is difficult for water to run out.

In this embodiment, the dip portion 62
The outflow leg 64 having a small diameter from the inflow leg 60 having a large diameter.
Since the width in the left-right direction gradually decreases toward, the drainage flowing into the dip portion 62 from the inflow leg 60 can be smoothly guided to the outflow leg 64, and the flow of drainage is good. Have.

Next, FIGS. 6, 7 and 8 show another embodiment of the present invention. In FIG. 6, reference numeral 80 denotes a tightening nut, which has a female screw portion 46 formed on the inner peripheral surface over the entire length in the axial direction. The female screw portion 46 is screwed into the male screw portion 34 on the outer peripheral surface of the drainage fitting 28. Have been combined.

The fastening nut 80 has an annular groove 82 that opens downward. Drain pipe trap 5
2 is formed at the upper end thereof with an upwardly extending annular projection 84, which is formed in the annular groove 82 of the tightening nut 80.
It is fitted watertight inside.

The drain pipe trap 52 is further formed with an annular flange 86 below the annular protrusion 84, and the flange 86 is connected to the fastening nut 80 by a connecting member 89 (see FIG. 8).

That is, as shown in FIG.
An engagement groove 88 is continuously formed in the outer circumferential surface of the tightening nut 80 in the circumferential direction. On the other hand, the connection member 89 has a pair of upper and lower metal ring portions (engagement portions) 90 and a clamp portion 92. And the metal ring portion 9 of the connecting member 89.
0 is engaged in the engagement groove 88 (see FIG. 6).

The diameter of the metal ring portion 90 can be reduced and increased by the clamping action of the clamp portion 92 and the release thereof, and the metal ring portion 90 is deformed by the clamping operation of the clamp portion 92. At the same time as the engagement with the engagement groove 88,
6 and the outer circumferential surface of the tightening nut 80, whereby the upper end of the drain pipe trap 52 and the tightening nut 80 are strongly fastened vertically.

In the case of the drainage device of this embodiment, the connection pipe 212 shown in FIG. 12 can be omitted similarly to the above embodiment, and since the entire dip portion 62 has a flat shape, the lower end position of the drainpipe trap 52 can be set. It can be located on the upper side, and it is possible to secure a wider storage space below the drain pipe trap 52.

Further, similarly to the above embodiment, the drain pipe 68 can be located at a rear position close to the back plate 22 inside the cabinet 16, and a wide storage space can be secured on the front side.

In the case of the drainage device of this embodiment, the connecting member 89
The drain pipe trap 52 can be connected to the tightening nut 80 and thus to the drain outlet fitting 28 very easily and simply by one-touch operation.

Further, at the time of connection by the connecting member 89, the upper end of the drain pipe trap 52 and the tightening nut 80 are firmly connected based on the engagement between the metal ring portion 90 as the engaging portion and the engaging groove 88. Can be fixed.

On the other hand, by releasing the clamp of the clamp portion 92, the upper end of the drain pipe trap 52 can be easily removed from the drain fitting 28 side.

FIG. 9 shows still another embodiment of the present invention. In this embodiment, the connecting member 8 having the above-mentioned clamp portion 92 is provided.
In this example, an elastic C-ring (resin in this example) connecting member 94 is used instead of the connecting member 94.

FIG. 10 specifically shows the connecting member 94. As shown in the drawing, the connecting member 94 has a predetermined opening in the circumferential direction and a fitting opening 100 formed therein. Further, a pair of annular and protruding engaging portions 98 are formed on the inner peripheral surface of the ring main body 96 in a vertical direction.

In this example, the connecting member 94 is fitted over the outer peripheral surfaces of the flange portion 86 and the tightening nut 80 of the drain pipe trap 52 through the opening 100, and a pair of engagement portions 98 of the inner peripheral surface. To the engagement groove 8 of the collar 86.
The upper end of the drain pipe trap 52 can be connected and fixed to the tightening nut 80, and further to the drainage fitting 28, by engaging the nut 8 with the engaging groove 88 of the tightening nut 80.

In this embodiment, the same effects as those of the embodiment shown in FIGS. 6, 7 and 8 can be obtained. Further, by attaching and detaching the elastic C-ring-shaped connecting member 94, the drain pipe can be easily formed with one touch. The upper end of the trap 52 can be connected to the fastening nut 80 or the connection can be released.

Although the embodiments of the present invention have been described in detail above, this is merely an example, and the present invention can be configured in variously modified forms without departing from the gist thereof.

[Brief description of the drawings]

FIG. 1 is a diagram showing the interior of a vanity including a drainage device according to an embodiment of the present invention, with a cabinet partially cut away.

FIG. 2 is a diagram specifically showing a structure of a drainage device in FIG.

3 is a view showing a cross-sectional shape of each part of a dip portion of the drain pipe trap in FIG. 2;

FIG. 4 is a perspective view showing the appearance of the drainage device of FIG. 2;

FIG. 5 is an exploded perspective view showing the drainage device of FIG. 2 disassembled into respective members.

FIG. 6 is a sectional view of a main part of a drainage device according to another embodiment of the present invention.

FIG. 7 is a diagram showing a main part of the drainage device of FIG. 6 in an external appearance state.

FIG. 8 is an exploded perspective view showing the drainage device of FIGS. 6 and 7 disassembled into respective members.

FIG. 9 is a sectional view of a main part of a drainage device according to still another embodiment of the present invention.

FIG. 10 is a diagram showing a connecting member alone in the drainage device of FIG. 9;

FIG. 11 is a view showing a conventional drainage device provided in a vanity stand together with the vanity stand.

FIG. 12 is an enlarged view showing a specific structure of the drainage device of FIG. 11;

[Explanation of symbols]

 12 Washbasin 28 Drainage fitting (drainage member) 34 Male screw part 36,80 Tightening nut 44 Male screw pipe part 50 Cap nut 52 Drain pipe trap 62 Dip part 82 Annular groove 84 Annular projection 86 Flange part 88 Engagement groove 89, 94 Connecting member 90 Metal ring part (engagement part) 92 Clamp part 98 Engagement part

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Seiji Terabe 5-1-1 Koiehonmachi, Tokoname-shi, Aichi Pref.

Claims (10)

[Claims] 1. A tightening nut is tightened from the back surface of a water tub into a male thread portion of a cylindrical drain port member which is inserted into a bottom opening of a water tub such as a basin or a sink and constitutes a drain port of the water tub. The drain port member is fixed to the bottom of the water tank with a drain pipe trap connected to the drain port member below the water tank, so that the dip portion at the bottom of the drain pipe trap is substantially horizontal. A drain device having a straight portion extending straight in a non-curved state in a direction. 2. A tightening nut is screwed into a male screw portion of a cylindrical drain port member which is inserted into a bottom opening of a water tank such as a basin or a sink and constitutes a drain port of the water tank, from the back surface of the water tank. The drain port member is fixed to the bottom of the water tank with a drain pipe trap connected to the drain port member below the water tank, so that the lower bottom surface of the bottom dip portion of the drain pipe trap is flattened. A drainage device characterized by a surface. 3. A tightening nut is tightened from the back surface of the water tub into a male thread portion of a cylindrical drain port member inserted into a bottom opening of the water tub such as a basin or a sink and constituting a drain port of the water tub. The drain port member is fixed to the bottom of the water tank with a drain pipe trap connected to the drain port member below the water tank, so that the dip portion at the bottom of the drain pipe trap is substantially horizontal. While having a straight portion extending straight in a non-curved state in the direction,
A drain device wherein the lower bottom surface of the dip portion is a flat surface. 4. The drainage device according to claim 1, wherein a cross section of the dip portion of the drain pipe trap is a horizontally long flat shape. 5. A tightening nut is screwed into the male screw portion of a cylindrical drain port member which is inserted into a bottom opening of a water tank such as a basin or a sink and constitutes a drain port of the water tank, from the back surface of the water tank. The drainage member is fixed to the bottom of the water tank with a drain pipe trap connected to the drainage member below the water tank. The drain nut has an inner diameter outside the drainage member. A drain device wherein a male screw pipe portion having a diameter larger than the diameter is integrally formed, and an upper end portion of the drain pipe trap is screwed to the male screw portion with a cap nut. 6. A tightening nut is tightened from the back surface of the water tub into a male screw portion of a cylindrical drain port member inserted into a bottom opening of a water tub such as a basin or a sink and constituting a drain port of the water tub. The drain port member is fixed to the bottom of the water tank with a drain pipe trap connected to the drain port member below the water tank, and the fastening nut has an annular groove that opens downward. At the same time, an upwardly extending annular projection is formed at the upper end of the drain pipe trap, and the tightening nut and the upper end of the drain pipe trap are formed in a state where the annular projection is fitted in the annular groove in a watertight manner. Characterized in that the drainage device is connected by a connection member. 7. The device according to claim 6, wherein the tightening nut and the upper end portion of the drain pipe trap are mounted over their outer peripheral surfaces and connected by the connecting member that tightens the outer peripheral surfaces. Drainage equipment. 8. The drainage device according to claim 7, wherein the connecting member is an elastic ring, and the tightening nut and the upper end of the drain pipe trap are tightened and connected based on an elastic force. . 9. The drainage device according to claim 7, wherein the connecting member comprises a clamp member having a clamp mechanism. 10. The coupling according to claim 6, wherein an engagement groove extending in a circumferential direction is formed in the fastening nut and an upper end portion of the drain pipe trap along an outer peripheral surface thereof. The drainage device, wherein the member includes an engagement portion that engages with the engagement groove.