JP7524099B2 - Drainage Device - Google Patents

Description

The present invention relates to a drain device.

A waterproof layer is installed on the rooftop of a building to prevent leaks. A drain device is also provided to drain rainwater and melted snow that accumulates on this waterproof layer. The drain device is connected to drainage pipes installed inside and outside the building, and is configured to collect water that has accumulated on the waterproof layer and drain it through the drainage pipe into a rainwater basin or the like. A strainer is generally attached to the drain device to prevent foreign objects such as garbage from entering the drainage pipe.

However, waterproofing layers require repair work at regular intervals to maintain their waterproofing function. One method of repair is the total replacement method, in which the existing waterproofing layer is removed and a new waterproofing layer is installed.

On the other hand, a cheaper method compared to the full replacement method is the overlay method (or covering method), in which the existing waterproof layer is left in place and a new waterproof layer is laid on top of it. With the overlay method, the waterproof function can be further improved by layering a new waterproof layer on top of the existing waterproof layer.

Regardless of which construction method is used, the drainage system must be reinstalled before the waterproof layer is laid, and the drain body and drainage pipe used in the existing drainage system must be reused.

In such cases, the existing drain system is removed and a new drain system known as a retrofit double drain is installed and connected to the existing drain pipe. This simplifies the renovation work and shortens the construction period.

Existing strainers are often fixed to the existing drain body with bolts or other fasteners. When renovating, the bolts are removed so as not to interfere with the installation of the new drain device. In such cases, the problem arises of how to attach the strainer to the new drain device.

A new structure has been proposed in which a leaf spring that can be inserted into the connecting pipe of the drain device is attached to the strainer, and the strainer is fixed to the drain by the frictional force generated when the leaf spring comes into contact with the inner wall surface of the connecting pipe with its elastic force.

However, in a strainer with this type of structure, it is only fixed to the new drain device by the frictional force between the leaf spring and the connecting pipe. Therefore, this frictional force decreases if water adheres to the inner wall of the connecting pipe, and in addition, if it is exposed to strong winds, the frictional force cannot withstand the force in the direction of pulling the strainer out, and the strainer may come off the drain.

In response to this, Patent Document 1 discloses a fixing bracket that fixes the drain cap body, which serves as a strainer, to the renovated double drain, and is configured to include a support member and a connecting member made of a resilient, flexible, linear or plate-like member, and the connecting member is curved so as to be convex toward the inside of the drain cap body, with both ends being engaged with the renovated double drain.

Patent No. 6712690 specification

According to the configuration of Patent Document 1, a frame material that is screw-connected to a height adjustment screw connected to the drain cap and a connecting member are connected via a detachment means. When attaching the drain cap, the end of the connecting member is attached to the connecting protrusion of the renovated double drain, and the frame material and connecting means are connected via the detachment means. The drain cap is then fixed to the renovated double drain by rotating the drain cap.

The drain cap attached to the renovated double drain in this way has a detachment means that detaches the connecting member from the frame material, so if a certain load is applied, such as when a strong wind blows, the drain cap may fly off. Also, there is a risk that the screw connection between the height adjustment screw and the frame material may become loose due to vibrations caused by the wind.

In addition, the configuration of Patent Document 1 has a large number of parts, which requires parts management and is costly.

In view of the above problems, the present invention aims to provide a drain device that is low-cost, easy to install, and can effectively prevent the strainer from falling off.

In order to solve the above problems, one representative drain device of the present invention is as follows:
A strainer and
A drain body including a tube portion connected to a drain pipe, a plate portion having an opening to which the tube portion is connected, and a beam portion disposed so as to span the opening;
This is achieved by having a coil spring that connects the beam portion of the drain body and the strainer on the inside of the strainer.

According to the present invention, it is possible to provide a drain device which is low in cost, has excellent installation workability, and can effectively prevent the strainer from falling off.
Problems, configurations and effects other than those described above will become apparent from the following description of the embodiments.

FIG. 1 is a cross-sectional view showing a drain device according to a first embodiment in a state where it is installed on a roof. FIG. 2 is an exploded perspective view of the drain device according to the first embodiment. FIG. 3 is a plan view of a drain body including a beam portion according to a modified example. FIG. 4 is a plan view of a drain body including a beam portion according to another modified example. FIG. 5 is a schematic cross-sectional view showing a drain device according to a modified example of the first embodiment. FIG. 6 is a schematic cross-sectional view showing a drain device according to another modified example of the first embodiment. FIG. 7 is a schematic cross-sectional view showing a drain device according to another modified example of the first embodiment. FIG. 8 is a schematic cross-sectional view showing a drain device according to another modified example of the first embodiment. FIG. 9 is a cross-sectional view showing the drain device of the second embodiment in a state where it is installed on a roof. FIG. 10 is an exploded perspective view of the drain device according to the second embodiment, as viewed from the drain pipe side. FIG. 11 is an exploded perspective view of the drain device according to the second embodiment, as viewed from the strainer side.

[First embodiment]
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a cross-sectional view showing a drain device of a first embodiment in a state where it is installed on a roof. Fig. 2 is a perspective view showing the drain device of the first embodiment in an exploded state.

(Configuration of the drain device)
First, the configuration of the drain device 10 of this embodiment for vertical pulling will be described with reference to FIG.
In FIG. 2 , the drain device 10 has a strainer 11 , two coil springs 12 , and a drain body 13 .

The strainer 11 is made up of a top 11a, a number of vertical column sections 11b that extend downward from the top 11a at equal angles to the axis and are arranged at regular intervals in the circumferential direction, an intermediate connecting section 11c that connects the middle of adjacent vertical column sections 11b, and a lower end connecting section 11d that connects the lower ends of adjacent vertical column sections 11b. An opening 11e is formed in the top 11a.

A connecting ring 14 is disposed below the top 11a of the strainer 11. The connecting ring 14 has a ring portion 14a and a body portion 14b connected to the ring portion 14a. A female threaded hole 14c is formed at the end of the body portion 14b.

The small screw 15 inserted through the opening 11e of the strainer 11 is screwed into the female threaded hole 14c of the connecting ring 14, and the connecting ring 14 is attached to the underside of the top 11a of the strainer 11 by tightening the small screw 15.

The C-shaped upper end locking portion 12a of each coil spring 12 is locked to the ring portion 14a of the connecting ring 14. In addition, durability can be improved by applying a heat shrink tube or the like to the coil spring 12 and coating it with resin.

The drain body 13 is made up of a flat plate portion 13a formed from a relatively thin metal plate, a recessed portion 13b formed in the center of the flat plate portion 13a, and a circular pipe (tubular portion) 13d connected to a circular opening 13c formed in the center of the recessed portion 13b. A beam portion 13e is also arranged in the radial direction of the circular opening 13c so as to span across the circular opening 13c.

The beam portion 13e has a long and thin flat plate shape, and its thickness direction is horizontal (i.e., both sides of the beam portion 13e are approximately parallel to the axis of the circular tube 13d), and both ends are fixed to the recessed portion 13b near the circular opening 13c by brazing, welding, etc. As shown in FIG. 1, near both ends of the beam portion 13e, step portions 13f are formed at positions equidistant from the axis of the circular opening 13c, and the C-shaped lower end locking portion 12b of the coil spring 12 is locked to each step portion 13f. The step portions 13f are the engagement portions, but notches or holes may be provided instead of the step portions 13f as the engagement portions. The beam portion 13e may also be a hollow or solid rod.

(Installation of drain device)
Next, an installation mode of the drain device 10 of this embodiment will be described with reference to FIG.
The drain device 10 of the present embodiment is installed by removing at least a part of an existing drain device that has been used until then, for example, for the purpose of improving the waterproof structure. As a preliminary step, the strainer and waterproof layer of the existing drain device, and the surrounding waterproof layer as well as the like are removed as necessary.

At this time, as shown in Figure 1, the waterproofing base (RC, PC, ALC, W, etc.) 1 placed on the roof of the building will have a shallow dish-shaped drain base 2 with a hole 2a in the center, and a drain pipe 3 connected to the hole 2a in the drain base 2 and extending downward from the vertical opening 1a of the waterproofing base 1. For this reason, it is necessary to assemble a new draining device taking into account the existing draining device.

First, the drain body 13 is attached to the existing drain base 2 by itself. Here, the circular pipe 13d of the drain body 13 has an outer diameter smaller than the inner diameter of the drain pipe 3, so the circular pipe 13d can be inserted into the inside of the drain pipe 3 to connect. When the circular pipe 13d is inserted into the inside of the drain pipe 3, the recess 13b of the drain body 13 is positioned above the drain base 2.

The recess 13b is formed to match the shape of the shallow dish-shaped drain base 2.

Meanwhile, the flat plate portion 13a of the drain body 13 is located on the upper surface of the waterproofing base 1 around the drain base 2. At this time, it is desirable to fix the lower surface of the flat plate portion 13a and the upper surface of the waterproofing base 1 using an adhesive sheet or an anchor, etc., taking into consideration wind pressure resistance and fit. In addition, since the flat plate portion 13a is a relatively thin metal plate, even if the upper surface of the waterproofing base 1 is slightly uneven, the flat plate portion 13a can be made to blend in with the upper surface by tapping it from above, thereby increasing the degree of adhesion. The existing waterproof layer is indicated by the symbol 4.

Furthermore, a waterproof layer 5 is laid over the upper surface of the flat plate portion 13a and the recessed portion 13b of the drain body 13 up to near the edge of the circular opening 13c. The waterproof layer 5 may be, but is not limited to, an asphalt waterproof layer, a sheet waterproof layer, or a coating waterproof layer. The thickness of the waterproof layer 5 varies depending on the material and construction method, but is approximately 1 mm to 15 mm.

After the waterproof layer 5 is installed, the strainer 11 is attached. Specifically, the connecting ring 14, which has the upper end retaining portion 12a of each coil spring 12 engaged with the ring portion 14a, is attached to the strainer 11 in advance using the small screw 15.

While holding the strainer 11 with one hand, the worker approaches the circular opening 13c from above the drain body 13, and with the other hand grasps and stretches the lower end of the coil spring 12 inside the strainer 11, engaging the lower end locking portion 12b with the step portion 13f of the beam portion 13e. The elastic force of the coil spring 12 is relatively small so that it can be stretched by the worker's force, so the locking operation to the beam portion 13e can be easily performed without the need for tools. For example, using a German hook for the lower end locking portion 12b of the coil spring 12 improves workability.

After the coil spring 12 is engaged with the beam portion 13e, the worker places the strainer 11 on the waterproof layer 5, and the elastic force of the coil spring 12 presses and fixes the lower end of the vertical column portion 11b of the strainer 11 to the waterproof layer 5, causing the strainer 11 to stand upright. According to this embodiment, installation is easy regardless of the thickness of the waterproof layer 5, and the same strainer 11 can be used regardless of the drain port diameter of the renovation drain device, allowing for standardization of parts.

As is clear from FIG. 1, the waterproof layer 5 installed on the existing waterproof layer 4 is higher than the waterproof layer 5 installed on the upper surface of the flat plate portion 13a and the recessed portion 13b. Therefore, rainwater that drips onto the waterproof layer 5 flows toward the circular opening 13c and does not form a puddle. Furthermore, rainwater that passes through the gaps between the vertical pillar portions 11b of the strainer 11 enters the circular opening 13c and is then drained through the drain pipe 3. At this time, debris in the rainwater is captured by the strainer 11 and does not enter the drain pipe 3.

According to this embodiment, even if the strainer 11 is exposed to strong winds, the elastic force of the coil springs 12 keeps it fixed upright in the waterproof layer 5. In addition, because the pair of coil springs 12 arranged symmetrically about the axis of the strainer 11 exert approximately equal elastic forces, even if the strainer 11 is temporarily blown by a strong wind, the centering effect of the coil springs 12 allows the strainer 11 to return to directly above the circular opening 13c, preventing it from shifting.

Furthermore, because both sides of the beam portion 13e are arranged so as to be approximately parallel to the axis of the circular pipe 13d, the bending rigidity in the axial direction of the circular pipe 13d is high. Therefore, even if it is formed from a thin plate material, it can support the elastic force of the coil spring 12, and the use of a thin plate material reduces the risk of inhibiting the flow of rainwater passing through the circular pipe 13d. According to the results of tests conducted by the inventors, it was confirmed that the drainage performance is equivalent regardless of the presence or absence of the beam portion 13e.

In addition, the thin edge of the beam 13e faces the direction of flow through the circular opening 13c, which helps prevent debris from getting caught on the beam 13e. In the unlikely event that debris gets caught on the beam 13e, the debris can be easily removed by lifting the strainer 11 by hand against the elastic force of the coil spring 12.

The number of coil springs and the shape and number of beams are not limited to the above-mentioned embodiment. In the above-mentioned embodiment, a single beam 13e is installed in the radial direction, but as shown in FIG. 3, a Y-shaped beam 13e' may be used when viewed in the axial direction of the strainer 11. The three ends of the beam 13e' are joined to the edge of the circular opening 13c of the drain body 13. In the case of this modified example, it is preferable to provide three coil springs 12 as shown in FIG. 1 and connect their lower ends to the vicinity of the outer peripheral end of the beam 13e'. In this case, it is preferable that each spring 12 is arranged symmetrically (axially symmetrically or planarly symmetrically) or parallel to the axis of the strainer 11.

Alternatively, as shown in Fig. 4, two beams 13e may be combined in a cross shape. Both ends of each combined beam 13e are joined to the edge of the circular opening 13c of the drain body 13. In the case of this modification, it is preferable to provide four coil springs 12 and connect their lower ends to the vicinity of the outer peripheral ends of the two beams 13e. In this case, it is preferable that each spring 12 is disposed symmetrically or parallel to the axis of the strainer 11.
However, as the area occupied by the beam portion 13e relative to the cross-sectional area of the circular tube 13d increases, the risk of foreign matter becoming caught increases, so a configuration in which one beam portion 13e is provided in the radial direction as in the first embodiment is preferable.

(Modification)
5 is a schematic cross-sectional view showing a drain device 10A according to a modification of the first embodiment. In this modification, the upper end locking portion 16a of the coil spring 16 is connected to the connecting ring 14, and the upper end locking portions 12a of the two coil springs 12 are connected to the lower end locking portion 16b of the coil spring 16. The lower end locking portions 12b of the two coil springs 12 are each locked to a beam portion 13e. The rest of the configuration is the same as in the above-mentioned embodiment, so the same reference numerals are used and redundant explanations are omitted.

According to this modified example, the elastic force can be easily adjusted by replacing the coil springs 12 and 16 with ones with different characteristics.

Figure 6 is a schematic cross-sectional view showing a drain device 10B according to another modified example of the first embodiment. In this modified example, the upper end locking portions 12a of two coil springs 12 are connected to the intermediate connecting portion 11c of the strainer 11, and the lower end locking portions 12b of the two coil springs 12 are locked to the beam portion 13e. The rest of the configuration is the same as in the above-mentioned embodiment, so the same reference numerals are used and redundant explanations are omitted.

In this modified example, the two coil springs 12 can be arranged parallel to the axis of the strainer 11, so the elastic force of the coil springs 12 can be effectively utilized to secure the strainer 11. In addition, there is no need to provide connecting rings or small screws, which reduces costs.

Figure 7 is a schematic cross-sectional view showing a drain device 10C according to another modified example of the first embodiment. In this modified example, the shape of the beam portion 13Ce is different from that of the first embodiment. The rest of the configuration is the same as in the first embodiment, so the same reference numerals are used and duplicated explanations are omitted.

In this modified example, the beam portion 13Ce has a joint end 13e1 that is joined to the circular pipe 13d, a central portion 13e2 that is shifted toward the coil spring 12 relative to the joint end 13e1, and a connection portion 13e3 that connects both ends of the central portion 13e2 to the joint end 13e1 in a straight line. A step 13e4 that protrudes downward is formed at the boundary between the joint end 13e1 and the connection portion 13e3, and the lower end locking portion 12b of the coil spring 12 that engages with the joint end 13e1 is locked to this step 13e4.

In this modified example, the beam portion 13Ce is bent in a crank shape so that the central portion 13e2 approaches the coil spring 12. This has the advantage that the central portion 13e2 is spaced apart from the upper end (entrance) of the circular pipe 13d, and foreign matter such as dirt that gets mixed in with rainwater flowing into the circular pipe 13d is less likely to get caught on the beam portion 13Ce.

Figure 8 is a schematic cross-sectional view showing a drain device 10D according to another modified example of the first embodiment. In this modified example, the shape of the beam portion 13De is different from that of the first embodiment. The rest of the configuration is the same as in the first embodiment, so the same reference numerals are used and redundant explanations are omitted.

In this modified example, the central portion 13e5 of the beam portion 13De is curved (U-shaped) so as to approach the coil spring 12. This has the advantage that the central portion 13e5 is spaced apart from the upper end (entrance) of the circular pipe 13d, and foreign matter such as dirt that gets mixed in with rainwater flowing into the circular pipe 13d is less likely to get caught on the beam portion 13De.

In addition, in this modified example, a step 13e7 that protrudes downward is formed at the boundary between the joint end 13e6 and the central portion 13e5, and the lower end locking portion 12b of the coil spring 12 that engages with the joint end 13e6 is locked to this step 13e7.

Second Embodiment
Fig. 9 is a cross-sectional view showing the drain device 20 of the second embodiment installed on a rooftop. Fig. 10 is an exploded perspective view of the drain device 20 of the second embodiment seen from the drain pipe side. Fig. 11 is an exploded perspective view of the drain device 20 of the second embodiment seen from the strainer side.

(Configuration of the drain device)
First, the configuration of the drain device 20 of this embodiment for lateral drainage will be described with reference to FIGS.
9 and 10, the drain device 20 has a strainer 21, two coil springs 22, and a drain body 23.

The strainer 21 has a pair of strainer members 21a, 21b and four pivot points 21c that connect the pair of strainer members 21a, 21b so that they can rotate freely. At the two central pivot points 21c, the strainer members 21a, 21b are each connected by a pin bolt 24 with a connecting ring 24a.

The strainer members 21a and 21b are formed, for example, by a mold, and each have a substantially rectangular grating portion 21d and 21e, and comb-tooth portions 21f and 21g extending at right angles from both sides of the grating portion 21d and 21e.

The grating sections 21d and 21e have multiple bars formed at equal intervals, and the multiple comb teeth formed on the comb tooth sections 21f and 21g are also formed at equal intervals, which makes it possible to prevent the passage of foreign objects. In addition, the length of the multiple comb teeth formed on the comb tooth sections 21f and 21g from the grating sections 21d and 21e gradually increases as they approach the pivot section 21c.

The C-shaped upper end locking portion 22a of each coil spring 22 is locked to the connecting ring 24a of the pin bolt 24 attached to the central pivot portion 21c.

The drain body 23 is made up of a vertical plate section 23a and a horizontal plate section 23b formed from a relatively thin metal plate, and a circular pipe (tube section) 23d connected to a circular opening 23c formed at the lower end of the vertical plate section 23a. A beam section 23e is also arranged horizontally across the circular opening 23c in the radial direction. However, the beam section shown in Figures 3 and 4 may also be provided in this embodiment.

The beam portion 23e in this embodiment is rod-shaped, and both ends thereof are fixed to the vertical flat plate portion 23a near the circular opening 23c by brazing, welding, or the like. The C-shaped lower end locking portion 22b of the coil spring 22 is locked to the beam portion 23e. In this embodiment, the two coil springs 22 are arranged approximately parallel to each other, so there is no need to provide a notch or the like in the beam portion 23e. However, as in the first embodiment, a notch or hole may be provided in the beam portion 23e. Also, the beam portion 23e may be plate-shaped, as in the first embodiment.

(Installation of drain device)
Next, an installation mode of the drain device 20 of this embodiment will be described with reference to FIG.
The drain device 20 of the present embodiment is installed by removing at least a part of an existing drain device that has been used until then, for example, for the purpose of improving the waterproof structure. As a preparation, the strainer and waterproof layer of the existing drain device, and the surrounding waterproof layer as well as the like are removed as necessary.

At this time, as shown in Figure 9, the waterproof base (RC, PC, ALC, W, etc.) 1 placed on the side wall of the building roof will have a drain base 2 with a hole 2a and a drain pipe 3 connected to the hole 2a of the drain base 2, which penetrates the side wall from the horizontal opening 1a of the waterproof base 1 and then extends downward. For this reason, it is necessary to assemble a new drain device taking into account the existing drain device.

First, the drain body 23 is attached alone to the existing drain base 2. Here, the circular pipe 23d of the drain body 23 has an outer diameter smaller than the inner diameter of the drain pipe 3, so the circular pipe 23d can be inserted into the inside of the drain pipe 3 to connect. When the circular pipe 23d is inserted into the inside of the drain pipe 3, the vertical plate portion 23a of the drain body 23 is located on the side of the waterproof base 1 around the drain base 2, and the horizontal plate portion 23b is located on the top surface of the waterproof base 1 around the drain base 2.

At this time, it is desirable to fix the vertical plate portion 23a and the horizontal plate portion 23b to the waterproof base using an adhesive sheet or anchors, etc., taking into consideration wind pressure resistance and fitting. In addition, since the vertical plate portion 23a and the horizontal plate portion 23b are relatively thin metal plates, even if there are some irregularities on the top surface of the waterproof base 1 or even if the waterproof base 1 is not formed at a right angle, the vertical plate portion 23a and the horizontal plate portion 23b can be tapped from the surface side to blend in with the waterproof base 1, thereby increasing the degree of adhesion. The existing waterproof layer is indicated by the symbol 4.

Furthermore, a waterproof layer 5 is laid over the surfaces of the vertical plate portion 23a and the horizontal plate portion 23b of the drain body 23 up to near the edge of the circular opening 23c. The waterproof layer 5 may be, but is not limited to, an asphalt waterproof layer, a sheet waterproof layer, or a paint film waterproof layer. The thickness of the waterproof layer 5 varies depending on the material and construction method, but is approximately 1 mm to 15 mm.

After installing the waterproof layer 5, attach the strainer 21. Specifically, the worker engages the upper end engagement portion 22a of each coil spring 22 with the connecting ring 24a of the pin bolt 24 attached to the pivot portion 21c on the central side of the strainer 21.

The worker then holds the strainer 21 in one hand and approaches the circular opening 23c from the side of the drain body 23, and with the other hand grasps and stretches the lower end of the coil spring 22 inside the strainer 21, engaging the lower end engaging portion 22b with the beam portion 23e. The elastic force of the coil spring 22 is relatively small so that it can be stretched by the worker's force, so that the engagement with the beam portion 23e can be easily performed without the need for tools.

After the coil spring 22 is engaged with the beam portion 23e, when the worker releases the strainer 21, the elastic force of the coil spring 22 presses and fixes the ends of the comb teeth 21f and 21g of the strainer 21 to the waterproof layer 5. At this time, since the strainer members 21a and 21b can rotate around the pivot portion 21c, even if the waterproof base 1 is not formed at a right angle, the ends of the comb teeth 21f and 21g are brought into close contact with the waterproof layer 5 in the vertical and horizontal directions, respectively, and gaps that allow the passage of foreign objects can be minimized.

As is clear from FIG. 9, the waterproof layer 5 installed on the existing waterproof layer 4 is higher than the waterproof layer 5 installed on the upper surface of the vertical flat plate portion 23a. Therefore, rainwater that drips onto the waterproof layer 5 flows toward the circular opening 23c and does not form a puddle. Furthermore, rainwater that passes through the gaps in the grating portions 21d, 21e or comb tooth portions 21f, 21g of the strainer 21 enters the circular opening 23c and is then drained through the drain pipe 3. At this time, debris and other particles in the rainwater are captured by the strainer 21 and do not enter the drain pipe 3.

According to this embodiment, even if the strainer 21 is exposed to strong winds, the elastic force of the coil spring 22 keeps it fixed to the waterproof layer 5.

The present invention is not limited to the above embodiment, and various modifications can be made. For example, the drain device 10 of the present embodiment has been described as being installed during renovation.
It can also be installed during new construction.

Reference Signs List 1 Waterproof base 2 Drain base 3 Drain pipe 4 Existing waterproof layer 5 Waterproof layer 10, 10A, 10B, 20 Drain device 11, 21 Strainer 12, 22 Coil spring 13, 23 Drain body 14 Connecting ring 15 Machine screw 24 Pin bolt

Claims (8)

A strainer and
A drain body including a tube portion connected to a drain pipe, a plate portion having an opening to which the tube portion is connected, and a beam portion disposed so as to span the opening;
A coil spring is provided inside the strainer to connect the beam portion of the drain body and the strainer.
A drain device characterized by: The beam portion is formed from a plate material, and both surfaces of the beam portion are approximately parallel to the axis of the cylindrical portion.
2. The drain device according to claim 1 . The beam portion is rod-shaped.
The drain device according to claim 1 . The beam portion is bent so that its center portion approaches the coil spring.
The drain device according to any one of claims 1 to 3. The beam portion has two or more ends joined to the plate portion, and one end of the coil spring is attached to each end of the beam portion near the two ends.
The drain device according to any one of claims 1 to 4. The opening is a circular opening, and the beam portion is disposed in a radial direction of the circular opening.
6. The drain device according to claim 5. A plurality of the coil springs are provided, and at least two of the coil springs are arranged symmetrically with respect to the axis of the strainer.
The drain device according to any one of claims 1 to 6. The beam portion has an engagement portion to which one end of the coil spring is engaged.
The drain device according to any one of claims 1 to 7.

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