Drain components, eaves gutters, rain gutters, buildings

Abstract

To provide drain components, gutters, rain gutters, and buildings that allow rainwater to flow smoothly and are easy to manufacture. [Solution] The drain member 100 comprises a lower drain member 110 having a lower flange portion 111 and an outer cylinder portion 112, and an upper drain member 120 having an upper flange portion 121, an inner cylinder portion 122, an inner cylinder reduced diameter portion 123, and a projection portion 130. The upper flange portion 121, the inner cylinder portion 122, the inner cylinder reduced diameter portion 123, and the projection portion 130 are integrally formed. The inner circumferential surface 123A of the inner cylinder reduced diameter portion 123 forms a curve that protrudes toward the inner circumference in a cross-section including the pipe axis O. The radial inner edge 130a of the projection portion 130 is inclined with respect to the pipe axis O and moves radially away from the pipe axis O as it goes from below to above.

Description

Technical Field

[0001] The present invention relates to a drain member, an eaves gutter, a rain gutter, and a building.

Background Art

[0002] For example, a pressurized drainage system is known as a drainage device used for a roof, particularly a rain gutter. This drainage device causes the water flow guided to the inside of the device through the radial fins to collide at the center of the device to generate a turbulent flow. This drainage device further incorporates a device that causes a turbulent flow, such as a protrusion and a vertical part, to cause a pressure fluctuation in the insertion port and pressurize the two-phase flow, thereby appropriately ensuring the drainage volume (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Here, in order to generate a turbulent flow in the insertion port and increase the drainage volume, it is necessary to provide a large space between the lid and the protrusion. However, in order to mold the protrusion as a single molding member with respect to the device main body, the mold structure for molding becomes complicated and molding is difficult.

[0005] The present invention has been made in view of the above circumstances, and an object thereof is to provide a drain member, an eaves gutter, a rain gutter, and a building that can smoothly flow down rainwater and are easy to manufacture.

Means for Solving the Problems

[0006] [[ID=,45]] A drain member according to one aspect of the present invention comprises a lower drain member having a lower flange portion and an outer cylindrical portion formed below the lower flange portion and extending downward, and an upper drain member having an upper flange portion, an inner cylindrical portion formed below the upper flange portion and extending downward and fitted into the outer cylindrical portion, an inner cylindrical diameter reduction portion connecting the upper flange portion and the upper end of the inner cylindrical portion and decreasing in diameter as it extends downward, and a plurality of projections provided in the circumferential direction that protrude upward from the upper flange portion, wherein the upper flange portion, the inner cylindrical portion, the inner cylindrical diameter reduction portion and the projections are integrally formed, the inner circumferential surface of the inner cylindrical diameter reduction portion has a curve that protrudes toward the inner circumferential side in a cross-section including the pipe axis, and the radial inner edge of the projection is inclined with respect to the pipe axis and moves radially away from the pipe axis as it extends from below to above. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide drain members, gutters, rain gutters, and buildings that can smoothly drain rainwater and are easy to manufacture. [Brief explanation of the drawing]

[0008] [Figure 1] This is a side view showing a schematic configuration of a rain gutter equipped with a drain member according to an embodiment of the present invention. [Figure 2] This figure shows a more detailed schematic of the rain gutter configuration shown in Figure 1. [Figure 3] This is an exploded view illustrating the general structure of a drain member according to an embodiment, showing a longitudinal cross-sectional view of the upper drain member and a side view of the lower drain member. [Figure 4] This is a longitudinal cross-sectional view showing the assembled drain member according to the embodiment. [Figure 5] This is a longitudinal cross-sectional view showing the drain member according to the embodiment in a disassembled state. [Figure 6] This is a longitudinal cross-sectional view illustrating the outlet portion of the drain member according to the embodiment. [Figure 7] This is a longitudinal cross-sectional view showing the relationship between the lower drain member of the drain member according to the embodiment and the receiving portion of the elbow. [Figure 8] It is a longitudinal sectional view showing a first formation example of injection molding an upper drain member according to an embodiment with a mold. [Figure 9] It is a sectional view showing a state where the upper drain member and the mold in FIG. 8 are broken along line A-A and the upper mold and the lower mold are removed. [Figure 10] It is an enlarged sectional view of part B in the upper drain member and the mold in FIG. 9. [Figure 11] It is a longitudinal sectional view showing a second formation example of injection molding an upper drain member according to an embodiment with a mold. [Figure 12] It is a longitudinal sectional view showing a state where the drain member according to Modification Example 1 is assembled. [Figure 13] It is a longitudinal sectional view showing a state where the drain member according to Modification Example 1 is disassembled. [Figure 14] It is a longitudinal sectional view showing a state where the drain member according to Modification Example 2 is assembled. [Figure 15] It is a longitudinal sectional view showing a state where the drain member according to Modification Example 2 is disassembled. [[ID=X]] [Figure 16] It is a longitudinal sectional view showing a state where the drain member according to Modification Example 3 is assembled. [Figure 17] It is a longitudinal sectional view showing a state where the drain member according to Modification Example 3 is disassembled. [Figure 18] It is a longitudinal sectional view explaining a positioning edge portion formed on the upper drain member according to Modification Example 3. [Figure 19] It is a longitudinal sectional view showing a state where the drain member according to Modification Example 4 is assembled. [Figure 20] It is a longitudinal sectional view showing a state where the drain member according to Modification Example 4 is disassembled. [Figure 21] It is a longitudinal sectional view explaining an example where the connection portion between the upper flange portion and the upper surface of the upper drain member is bent and connected. [Figure 22] It is a view showing a protrusion according to Modification Example 5. [Figure 23] It is a view showing a protrusion according to Modification Example 6. [Figure 24] It is a view showing a protrusion according to Modification Example 7. [Figure 25]It is a perspective view showing a specific connection state of the garbage removal part according to the embodiment. [Figure 26] It is a perspective view showing a connection state of the garbage removal part according to Modification 8. [Figure 27] It is a view showing a connection state of the garbage removal part according to Modification 9. [Figure 28] It is a plan view of the connection state of the garbage removal part in FIG. 27 as viewed from arrow C.

Mode for Carrying Out the Invention

[0009] Hereinafter, the drain member, eaves gutter, rain gutter, and building according to the embodiment of the present invention will be described in detail based on the drawings. In this embodiment, although specific examples of numerical ranges including dimensions are described, the drain member, eaves gutter, rain gutter, and building do not necessarily have to satisfy the numerical ranges. Also, although materials are exemplified, they are not necessarily limited to those materials.

[0010] FIG. 1 is a side view showing a schematic configuration of a rain gutter provided with a drain member. As shown in FIG. 1, the drain member 100 (drainage member) according to the present embodiment has a high drainage function and is provided inside a large eaves gutter 10 arranged at the eaves tip of a rain gutter 1 attached to a building Bu such as a factory or a shopping center. The building Bu includes a roof (both not shown) having an eaves tip, an eaves gutter 10 arranged at the eaves tip, a drain member 100 installed on the bottom plate (bottom surface) 11 of the eaves gutter 10, and a vertical gutter 20 connected to an outer cylinder portion 112 (described later) of the drain member 100 protruding downward from the bottom plate (bottom) 11 of the eaves gutter 10. The building Bu also includes a water collection tray 80 (see FIG. 2) to which the lower end portion 20b of the vertical gutter 20 is connected.

[0011] In addition, in order to allow rainwater to flow smoothly, it may be confirmed by drainage calculation whether the maximum drainage volume obtained by the combination of the eaves gutter 10, the vertical gutter 20, and the drain member 100 satisfies the necessary drainage volume predicted from the rainfall amount. For example, by calculating the roof projection area per drain (one drain outlet) from architectural drawings, etc., and multiplying it by the rainfall intensity, the amount of rainfall can be obtained. Furthermore, the drainage volume of the gutter 10 can be obtained from the effective drainage cross-sectional area and wetted perimeter length of the gutter 10. Furthermore, the drainage volume of the downpipe 20 can be determined from the length of the downpipe 20 and its effective drainage cross-sectional area. Therefore, by checking whether the drainage volume of the eaves gutter 10 and the downpipe 20 exceeds the amount of rainfall, it is possible to confirm whether the required drainage volume is being met.

[0012] As shown in Figure 1, the rain gutter 1 comprises a eaves gutter 10, a drain member 100 installed on the bottom plate 11 of the eaves gutter 10, a first elbow 12A connected to the lower drain member 110 (described later) of the drain member 100, a lower pipe 12 connected to the lower drain member 110 via the first elbow 12A, a second elbow 12B connected to the lower pipe 12, and a downpipe 20 connected to the lower pipe 12 via the second elbow 12B. Specifically, the first elbow 12A is connected to the outer cylindrical portion 112 (described later) of the lower drain member 110. In other words, the rain gutter 1 includes a gutter 10 on which a drain member 100 is installed. The rain gutter 1 also includes a downpipe 20 to which the drain member 100 is connected.

[0013] The connecting gutter 12 guides rainwater W flowing down from the drain member 100 provided in the eaves gutter 10 horizontally. One end is connected to the lower surface 11B of the eaves gutter 10 via the drain member 100 by a first elbow 12A, and the other end is connected to the upper end of the downpipe 20 by a second elbow 12B. In this type of rain gutter 1, the downpipe 20 is arranged vertically Di3 along the outer wall P of the building Bu, and the lower end of the downpipe 20 is connected to a drain pipe (not shown) buried in the ground. Rainwater flowing down from the eaves of the roof is received by the eaves gutter 10, overflows upwards, and is drained to the drain pipe side via the connecting gutter 12 and the downpipe 20. In Figure 1, the right side of the page is the side of building Bu. In the rain gutter 1, the side facing building Bu is called the rear or back, and the side away from building Bu is called the front or front.

[0014] Figure 2 is a side view showing a more detailed schematic configuration of the rain gutter shown in Figure 1. Figure 3 is a longitudinal cross-sectional view illustrating the general structure of the drain member. As shown in Figures 2 and 3, the gutter 10 has a base plate 11 and front walls (side plates) 15 and rear walls (side plates) 16 extending upward from both ends in the width direction of the base plate 11. A drain member 100 is attached to a circular pilot hole 11H formed in the base plate 11 of the gutter 10. Specifically, the gutter 10 is an extruded product of synthetic resin such as rigid polyvinyl chloride resin, ABS, or AES, and the main body is formed in a groove-shaped cross section in which the front wall 15 is erected from the front end of the flat base plate 11 and the rear wall 16 is erected from the rear end of the base plate 11. The gutter 10 can be arbitrarily selected from, for example, a single resin, a composite (multilayer) resin, a single metal, or a composite material in which metal is coated with resin. The gutter 10 is suspended by a gutter hanger (not shown) attached to a fascia board (not shown) and is installed along the eaves direction Di1. The gutter 10 is designed to collect rainwater that flows down from the eaves of the roof.

[0015] Furthermore, to prevent expansion and contraction due to heat, the gutter 10 has a linear expansion coefficient of 2.0 × 10 -5 It is preferable that the temperature is below / ℃, and the coefficient of linear expansion can be reduced by inserting a low-stretch sheet, such as a PET resin sheet or an iron sheet stretched to the center in the thickness direction of the gutter 10, or by incorporating low-stretch additives such as wollastonite or carbon fiber into the synthetic resin that makes up the gutter 10. Note that it is not limited to synthetic resins, and metal extruded products may also be used. In the case of metal, for example, the gutter 10 may be formed from an acid-resistant coated steel sheet, in which a hot-dip galvanized layer is formed on both surfaces in the thickness direction of a steel sheet with a thickness of 0.4 mm, 0.5 mm, 0.6 mm, 0.8 mm, etc. A special adhesive layer is formed on both surfaces in the thickness direction of these hot-dip galvanized layers and on the continuous sides of the steel sheet and the hot-dip galvanized layers on both sides. One surface of this special adhesive layer in the thickness direction and the half of the side adjacent to this surface are coated with a first special polymer resin coating layer with a thickness of 0.4 mm, and the other surface of this special adhesive layer in the thickness direction and the remaining half of the side adjacent to this surface are coated with a second special polymer resin coating layer with a thickness of 0.4 mm. The eaves gutter 10 is, for example, said to have a base width of 100 mm or more and 200 mm or less, and a height of 90 mm or more and 150 mm or less, and is applicable to a large-diameter downpipe that can carry rainwater at a flow rate of 4 liters / sec or more and 50 liters / sec or less. The eaves gutter 10 may also be a large rain gutter with an inner width of 200 mm or more of the base plate 11. For example, the inner width of the base plate 11 may be 200 mm, 300 mm, 400 mm, 500 mm, etc. Also, the height of the eaves gutter 10 may be 150 mm or more, for example, 200 mm, 300 mm, etc.

[0016] The first elbow 12A is a joint installed on the downstream side of the drain member 100. As shown in Figure 2, the first socket 60A of the first elbow 12A is connected to the outer cylindrical portion 112 of the drain member 100.

[0017] The first elbow 12A comprises a curved pipe section 12A1 and receiving openings 60A and 60B provided at both ends of the curved pipe section 12A1. The curved pipe section 12A1 is bent at approximately 90° when viewed from the side. The upstream end 12a of the downpipe 12 is connected to the second receiving port 60B of the first elbow 12A. The downpipe 12 is a member that guides rainwater W (see Figure 1) that has flowed down the first elbow 12A horizontally, and is a straight pipe that extends along the front-rear direction Di2, or extends such that the distance from the front-rear direction Di2 increases as it moves downstream. The length from the upstream end 12a to the downstream end 12b of the downpipe 12 (downpipe length F1) is greater than 0m and 2.0m or less, preferably 0.6m or more and 1.5m or less, and more preferably 0.6m or more and 1.0m or less. By keeping the downpipe length F1 within the above range, rainwater that has flowed down from the first elbow 12A flows smoothly when full.

[0018] The first socket 60A of the second elbow 12B is connected to the downstream end 12b of the downpipe 12. In the illustrated example, the second elbow 12B has the same configuration as the first elbow 12A, but it does not have to have the same configuration.

[0019] The upper end 20a of the downpipe 20 is connected to the second socket 60B of the second elbow 12B. The downpipe 20 is a member that carries rainwater W flowing down the second elbow 12B vertically, and is a straight pipe extending along the vertical direction Di3 (vertical direction and the opposite direction). The lower end 20b of the downpipe 20 is connected to the ground G and to a known catch basin 80 buried underground. The catch basin 80 is connected to a drainage structure such as a sewer pipe 82 via a connecting pipe 81. The catch basin 80 has a wider width than the downpipe 20.

[0020] The length of the downpipe 20 from the upper end 20a to the lower end 20b (downpipe length F2) is 2.0m or more, preferably 3.0m or more, and more preferably 4.0m or more. By having the downpipe length F2 within the aforementioned range, the siphon effect in the downpipe 20 is properly generated and maintained. As the length of the downpipe F2 increases, the amount of rainwater W flowing down to the lower end 20b increases, causing the rainwater W to flow vigorously into the catch basin 80.

[0021] In this embodiment, an example is described in which the drain member 100 and the upper end 20a of the downpipe 20 are connected by a downpipe 12, but this is not the only example. As another example, the upper end 20a of the downpipe 20 may be directly connected to the lower part of the drain member 100 using a socket (not shown).

[0022] The drain component will be described in detail below with reference to Figures 3 to 11. In the following explanation, the vertical direction Di3 will be abbreviated as "vertical direction".

[0023] As shown in Figure 3, the drain member 100 includes, for example, a lower drain member 110, an upper drain member 120, and a debris-blocking section 150, and is attached to the gutter 10. Specifically, the lower drain member 110 is positioned on the lower surface 11B side of the bottom plate 11 of the gutter 10, and the upper drain member 120 is positioned on the upper surface 11A side of the bottom plate 11.

[0024] The material used to form the drain member 100 can be arbitrarily set, but it is preferably made of resin. Specifically, the drain member 100 is an injection-molded product made of synthetic resin such as rigid polyvinyl chloride resin, polycarbonate, ABS, or AES. However, it is not limited to synthetic resin and may also be formed by casting cast iron, stainless steel, or aluminum.

[0025] Next, with reference to Figures 4 to 7, the lower drain member 110, the upper drain member 120, and the debris-blocking section 150 that constitute the drain member 100 will be described. Figure 4 is a longitudinal cross-sectional view showing the assembled drain member, and Figure 5 is a longitudinal cross-sectional view showing the disassembled drain member. Figure 6 is a longitudinal cross-sectional view illustrating the outlet portion of the drain member, and Figure 7 is a longitudinal cross-sectional view showing the relationship between the lower drain member and the receiving portion of the elbow. Figures 4 to 7 are simplified diagrams in which the projection 130 and receiving portion 140 (both described later) of the upper drain member 120 are omitted.

[0026] As described above, the drain member 100 includes a lower drain member 110, an upper drain member 120, and a debris-blocking section 150.

[0027] As shown in Figures 4 and 5, the lower drain member 110 includes, for example, a lower flange portion 111 positioned on the lower surface 11B of the bottom plate 11 of the gutter 10, an outer cylinder portion 112 formed below the lower flange portion 111 and extending downward, an outer cylinder reduced diameter portion 113 connecting the lower flange portion 111 and the outer cylinder portion 112, and an inner circumferential thread portion 115 formed on the inner circumferential surface of the outer cylinder portion 112.

[0028] The lower flange portion 111 is formed, for example, with a circular outer shape in plan view, and a circular receiving hole 111H is formed on the inner circumference in plan view. In other words, the lower flange portion 111 is formed from a ring-shaped flat plate in plan view. Furthermore, the lower flange portion 111 has a flat upper surface 111A on the outer circumference, and a recessed area on the inner circumference that is indented downward relative to the flat surface. The upper surface 111A of the lower flange portion 111 is positioned on the lower surface 11B of the bottom plate 11 of the gutter 10.

[0029] The outer cylinder portion 112 is formed, for example, in a cylindrical shape centered on the pipe axis O1, and extends vertically when attached to the gutter 10. Furthermore, an inner circumferential hole 112H is formed inside the outer cylinder portion 112, which penetrates vertically. Furthermore, an internal threaded portion 115 is formed on the inner circumferential surface of the outer cylinder portion 112. Furthermore, four tool mounting recesses (recesses) 118, which are recessed upwards, are formed at 90° intervals in the circumferential direction on the lower end portion 112T of the outer cylinder portion 112. The position and number of tool mounting recesses (recesses) 118 can be set arbitrarily. For example, two tool mounting recesses (recesses) 118 may be formed at equal intervals in the circumferential direction. In addition, the vertical position of the upper bottom surface 118A of the tool mounting recess (recess) 118 can be set arbitrarily, but it is preferable that it be formed below the lower end of the inner cylinder portion 122.

[0030] As shown in Figures 4 and 5, the outer cylinder reduced diameter portion 113 connects the lower flange portion 111 and the upper end of the outer cylinder portion 112 by decreasing in diameter as it extends downward. Furthermore, a fitting guide portion (continuous reduced inner diameter surface) 113G is formed on the inner circumferential surface of the outer cylinder reduced diameter portion 113. In this embodiment, the fitting guide portion 113G is formed, for example, by an inclined surface on the inner circumferential side of a substantially conical cylinder that is continuously reduced in diameter from the upper end of the outer cylinder reduced diameter portion 113 to the inner circumferential surface of the outer cylinder portion 112. In other words, the fitting guide portion 113G is configured without any steps or bulges that protrude on the inner circumferential side and cause snagging.

[0031] Furthermore, the shape of the continuous diameter-reducing inner surface can be arbitrarily set and is not limited to an inclined surface formed in a substantially conical shape in which the cross-section including the pipe axis O1 is reduced in diameter in a straight line. For example, it may be configured such that the cross-section is reduced in a curved shape, or an inclined surface that combines straight and curved lines.

[0032] The internal threaded portion 115 is formed on the inner surface of the outer cylinder portion 112. Furthermore, the internal circumferential thread portion 115 can be of various known shapes. Specifically, it may be formed with gaps in the circumferential direction or continuously in the circumferential direction.

[0033] Next, the upper drain member 120, which forms the flow path surface of the drain member 100, will be described. As shown in Figures 4 and 5, the upper drain member 120 includes, for example, an upper flange portion 121 positioned on the upper surface 11A of the bottom plate 11 and having a drain opening portion 121H formed on its inner circumference, an inner cylinder portion 122 formed below the upper flange portion 121 and extending downward and fitted into the outer cylinder portion 112, an inner cylinder diameter reduction portion 123 connecting the upper flange portion 121 and the upper end of the inner cylinder portion 122 and decreasing in diameter as it extends downward, a plurality of projections 130 protruding upward from the upper flange portion 121 and provided in the circumferential direction, receiving portions 140 provided on the plurality of projections 130, and an outer circumference threaded portion 125 formed on the outer circumference surface of the inner cylinder portion 122. The upper flange portion 121, the inner cylinder portion 122, the inner cylinder reduced diameter portion 123, the projection portion 130, and the receiving portion 140 are integrally formed. Then, the inner cylindrical portion 122 of the upper drain member 120 is fitted into the outer cylindrical portion 112 of the lower drain member 110, and the outer threaded portion 125 and the inner threaded portion 115 are screwed together to form the drain member 100.

[0034] The upper flange portion 121 is formed, for example, with a circular outer shape in plan view, and a circular drain portion 121H is formed on the inner circumference in plan view. In other words, the upper flange portion 121 is formed in a ring-shaped flat plate form in plan view. The lower surface 121B of the upper flange portion 121 is positioned on the upper surface 11A of the bottom plate 11 of the gutter 10.

[0035] Furthermore, the lower surface 121B of the upper flange portion 121 has, for example, a flat surface on its outer circumference, and a positioning step portion 126 consisting of a cylindrical portion that protrudes downward along the pipe axis O2 on the inner circumference of the flat surface. Furthermore, by having this positioning step portion 126 come into contact with the inner circumferential surface of the pilot hole 11H of the gutter 10, the upper drain member 120 can be positioned relative to the pilot hole 11H.

[0036] The inner cylinder portion 122 is formed, for example, as a cylindrical shape that can be fitted into the outer cylinder portion 112 with the pipe axis O2 as its center, and extends in the vertical direction when attached to the gutter 10. Furthermore, an inner circumferential hole 122H is formed inside the inner cylinder portion 122, which penetrates vertically. Furthermore, an outer threaded portion 125 is formed on the outer circumferential surface of the inner cylinder portion 122.

[0037] As shown in Figures 4 and 5, the inner cylinder reduced diameter section 123 connects the upper flange section 121 and the upper end of the inner cylinder section 122 by decreasing in diameter as it extends downward. The inner circumferential surface 123A of the inner cylinder reduced diameter section 123 is formed into a smooth shape with a gentle curve that protrudes toward the inner circumference in a cross-section including the pipe axis O2. The cross-section including the pipe axis O2 is a cross-section in the vertical direction including the pipe axis O2. The inner circumferential surface 123A of the inner cylinder reduced diameter section 123 will be described in detail later. In this embodiment, the upper surface 123A of the inner cylinder reduced diameter portion 123 constitutes the flow path surface from the outlet portion 121H to the inner circumferential hole 122H of the inner cylinder.

[0038] Furthermore, in this embodiment, the outer circumferential surface of the inner cylinder diameter reduction portion 123 is a continuous diameter reduction outer circumferential surface that continuously reduces in diameter up to the outer circumferential surface of the inner cylinder portion 122. Specifically, the outer circumferential surface of the inner cylinder diameter reduction portion 123 is formed in a smooth shape by a gentle curve that is recessed toward the inner circumference up to the upper end of the inner cylinder portion 122 in a cross-section including the pipe axis O2. In other words, no steps are formed on the outer circumferential surface of the inner cylinder diameter reduction portion. Note that the continuous diameter reduction outer circumferential surface of the inner cylinder diameter reduction portion may be formed by a straight line or a line that combines a straight line and a curve. Also, it is possible to arbitrarily set whether or not to form a continuous diameter reduction outer circumferential surface on the outer circumferential surface of the inner cylinder diameter reduction portion, and a configuration without a continuous diameter reduction outer circumferential surface is also possible.

[0039] The outer threaded portion 125 is formed on the outer surface of the inner cylinder portion 122. Furthermore, the outer circumferential threaded portion 125 can be of various known shapes that can be screwed into the inner circumferential threaded portion 115, for example, it may be formed with gaps in the circumferential direction or formed continuously in the circumferential direction.

[0040] In this embodiment, the fitting configuration for fitting the inner cylinder portion 122 of the upper drain member 120 to the outer cylinder portion 112 of the lower drain member 110 is described using an outer threaded portion 125 and an inner threaded portion 115 (screw fitting) as an example, but it is not limited to this. As other fitting configurations, for example, a fitting structure such as a bayonet may be used, and fitting portions that fit together may be provided on both the inner cylinder portion 122 and the outer cylinder portion 112. Preferably, the fitting portions are configured such that the inner cylinder portion 122 and the outer cylinder portion 112 are less likely to be displaced (less likely to shift) relative to each other until the upper drain member 120 and the lower drain member 110 are fixed to the gutter 10 with adhesive.

[0041] Here, we will describe in detail the upper surface 123A of the inner cylinder reduced diameter portion 123. The reference numeral P1 in Figure 6 indicates the position of the lower end of the outer cylinder reduced diameter portion 113 and the upper end of the outer cylinder portion 112. The radius of curvature R of the upper surface 123A of the inner cylinder reduced diameter portion 123 is preferably formed to be as large as possible, as shown in Figure 6, taking into account, for example, the diameter D0 of the pilot hole 11H, the diameter D1 of the upper inner circumference of the outer cylinder reduced diameter portion 113, the diameter D2 of the drop-off portion 121H, and the height dimension L11 to the lower end P1 of the outer cylinder reduced diameter portion 113. In other words, in order to avoid interference between the outer circumferential surface of the inner cylinder reduced diameter portion 123 and the upper inner circumference of the outer cylinder reduced diameter portion 113, it is preferable to either reduce the curvature of the outer cylinder reduced diameter portion 113, i.e., the upper surface 123A, or to set the diameter D1 of the outer cylinder reduced diameter portion 113 to be large.

[0042] Specifically, for example, if the joint (elbow, etc.) or downpipe connected to the lower drain member 110 has a nominal diameter of 75, it is preferable to set the radius of curvature R to 10 mm or more and 30 mm or less. Furthermore, for example, in the case of a nominal diameter of 100, it is preferable to set the radius of curvature R to be between 12 mm and 40 mm, and in the case of a nominal diameter of 125, it is preferable to set the radius of curvature R to be between 13 mm and 50 mm.

[0043] Next, with reference to Figure 7, the outer circumferential shape of the lower drain member 110 will be described. The outer cylinder diameter reduction section 113 does not have a stopper that contacts the end face of the first socket 60A of the downstream first elbow (joint section) 12A. Therefore, as shown in Figure 7, it is preferable to set the length dimension L12 from the upper end P1 of the outer cylinder portion 112 to a length dimension L0 from the end face of the first socket 60A of the first elbow 12A to the bottom surface 60C of the socket. By setting it in this way, the relative positions of the drain member 100 and the first elbow 12A in the direction of the pipe axis O1 are accurately set, and interference between the outer surface of the outer cylinder reduced diameter portion 113 and the first receiving port 60A can be prevented.

[0044] As shown in Figure 3, the projections 130 are, in the illustrated example, multiple vertical ribs that protrude upward from the upper flange portion 121 and are provided in the circumferential direction. It is desirable that the multiple projections 130 are provided at equal intervals in the circumferential direction of protrusion. The number of multiple projections 130 can be arbitrarily selected from 2, 3, 4, 5, 6, etc. The multiple projections 130 are integrally formed on the upper flange portion 121, the inner cylinder portion 122, and the inner cylinder reduced diameter portion 123. The multiple projections 130 are formed, for example, in a plate shape with a constant thickness. The multiple projections 130 are arranged radially along the radial direction centered on the pipe axis O2.

[0045] Multiple protrusions 130 are provided in the inlet opening 100A of the drain member 100. Here, the inlet opening 100A is in a direction perpendicular to the horizontal plane (in the direction of the pipe axis) and refers to the space between the outer edge 150a of the debris-blocking section 150 (described later) and the upper surface 11A of the gutter 10, or the space between the upper flange section 121 of the upper drain member 120. The multiple protrusions 130 have the function of preventing debris and fallen leaves from entering the inside of the drain member 100 (specifically, the inner cylinder portion 122). The protrusion 130 has a radially inner first end edge (edge) 130a, a radially outer second end edge 130b, a third end edge 130c that is connected to the inner circumferential surface 123A of the inner cylinder diameter reduction portion 123, an upper fourth end edge (upper end) 130d on the pipe axis O2, and a lower fifth end edge (lower end) 130e on the pipe axis O2.

[0046] The first edge 130a is inclined with respect to the pipe axis O2. Specifically, the first edge 130a is inclined so as it moves radially away from the pipe axis O2 from the lower fifth edge 130e to the upper fourth edge 130d. The second edge 130b is formed along the pipe axis O2 from the fifth edge 130e to the fourth edge 130d. The radially outer end 130c1 of the third edge 130c is integrally formed with the upper surface 121A of the upper flange portion 121. The third edge 130c is continuous with the inner circumferential surface 123A of the inner cylinder reduced diameter portion 123 from the outer end 130c1 to the fifth edge 130e. The third edge 130c is formed in a curve that is recessed toward the pipe axis O1. In the illustrated example, the fifth edge 130e is located at the boundary between the inner cylinder portion 122 and the inner cylinder reduced diameter portion 123, but the position of the fifth edge 130e is not limited to this.

[0047] The multiple protrusions 130 have the function of preventing debris and fallen leaves from entering the inside of the drain member 100 (specifically, the inner cylindrical portion 122). The multiple protrusions 130 also function as support parts for the debris-blocking portion 150, which will be described later. Furthermore, the multiple protrusions 130 may have the function of straightening the flow of rainwater W (see Figure 1) inside the drain member 100. Additionally, the multiple protrusions 130 may have the function of gripping and installing the drain member 100 onto the bottom plate 11 of the gutter 10.

[0048] In this embodiment, an example in which the projection 130 is formed in a plate shape is described, but the projection 130 is not limited to a plate shape. As another example, the projection 130 may be formed in other shapes such as a columnar shape. Also, in this embodiment, an example in which a plurality of projections 130 are arranged radially along the radial direction is described, but it is not limited to this. As another example, a plurality of projections 130 may be arranged at an inclination with respect to the radial direction.

[0049] The receiving portion 140 is provided, for example, on the fourth end edge 130d of the multiple protrusions 130. The receiving portion 140 is integrally formed on the fourth end edge 130d of the multiple protrusions 130. The receiving portion 140 is formed, for example, in an annular shape with a certain thickness. The receiving portion 140 supports the debris-blocking portion 150, which will be described later. In this embodiment, an example in which the receiving portion 140 is formed in an annular shape is described, but it is not limited to this. As another example, for example, the receiving portion 140 may be provided individually on the fourth end edge 130d of the multiple protrusions 130. The receiving portion 140 may be, for example, a molded product integral with the upper flange portion 121, the inner cylinder portion 122, the inner cylinder reduced diameter portion 123, and the multiple protrusions 130, or it may be a separate part from the multiple protrusions 130.

[0050] As shown in Figure 3, the debris-blocking portion 150 is provided on the upper surface 140b of the receiving portion 140. That is, the debris-blocking portion 150 is provided on the fourth end edge 130d of the multiple protrusions 130 via the receiving portion 140. The debris-blocking portion 150 is, for example, a separate molded product from the upper flange portion 121, the inner cylinder portion 122, the inner cylinder reduced diameter portion 123, and the multiple protrusions 130. In this embodiment, the debris-blocking portion 150 is described as a separate molded product from the multiple protrusions 130, etc., but the debris-blocking portion 150 may be formed integrally with the multiple protrusions 130. Note that the receiving portion 140 is not required, and the protrusions 130 and the debris-blocking portion 150 may be directly connected.

[0051] The debris-blocking section 150 may be a flat plate or not. The debris-blocking section 150 has the function of preventing debris and fallen leaves from entering the inside of the drain member 100 (specifically, the inner cylinder portion 122). The debris-blocking section 150 can be a lid, a funnel, a mesh, etc. By making the debris-blocking section 150 a funnel (for example, a cylindrical shape that narrows in diameter downwards), it can be used as a guide for rainwater W, for example, but it does not have to function as a guide when it is a funnel. If the debris-blocking section 150 is a funnel, for example, even if debris accumulates between the debris-blocking section 150 and the upper flange portion 121, rainwater can be allowed to flow down from inside the funnel (inside the cylinder), and a reduction in flow rate can be suppressed. If the debris-blocking section 150 is a funnel, turbulence is likely to occur below the funnel, which can easily induce the siphon effect. Furthermore, by making the debris-blocking section 150 a mesh, debris and fallen leaves can be separated from the rainwater W. In addition, the debris-blocking section 150 may be a protruding shape (for example, spherical) that points upward. In this case, for example, a large space is created between the debris-blocking section 150 and the outlet section 121H, making it easier for turbulence to occur and inducing the siphon effect. In this embodiment, an example is described in which a debris-blocking portion 150 is provided on the fourth end edge 130d of a plurality of protrusions 130, but it is not necessary to provide debris-blocking portions 150 on all of the protrusions 130. The debris-blocking portion 150 may be located above the drain opening 121H. The specific connection details of the debris-blocking section 150 will be explained later.

[0052] Next, we will describe a first and second example of injection molding of the upper drain member 120 using a mold. For convenience, the upper drain member and multiple protrusions etc. that are injection molded in the first and second examples will be denoted by the same reference numerals. First, the first example of formation will be explained based on Figures 8 to 10. Figure 8 is a longitudinal cross-sectional view showing a first example of injection molding of the upper drain member using a mold. Figure 9 is a cross-sectional view showing the upper drain member and mold from Figure 8 cut along line AA, with the upper and lower molds removed. Figure 10 is an enlarged cross-sectional view of section B in the upper drain member and mold from Figure 9.

[0053] As shown in Figures 8 to 10, the upper drain member 120 that is injection molded in the first forming example includes an upper flange portion 121, an inner cylinder portion 122, an inner cylinder reduced diameter portion 123, a plurality of protrusions 130, and a receiving portion 140. When forming this upper drain member 120, the mold 160 includes an upper mold (first mold) 161, a lower mold (second mold) 162, and a plurality of slide molds 163.

[0054] The inner circumferential surface 123A of the inner cylinder reduced diameter portion 123 forms a curve that protrudes toward the inner circumference in a cross-section including the pipe axis O2. Therefore, for example, by making the boundary between the inner circumferential surface 123A of the inner cylinder reduced diameter portion 123 and the inner cylinder portion 122 a parting line PL, the upper mold 161 and the lower mold 162 can be opened by removing them vertically as shown by the arrows in Figure 8. Furthermore, each of the multiple projections 130 has an end 130f on its radially inward side. The end 130f extends, for example, inclined with respect to the pipe axis O2, moving radially away from the pipe axis O2 as it extends from below to above. The receiving portion 140 is formed in an annular shape with a constant thickness. The inner end 140a of the receiving portion 140 protrudes radially inward from, for example, the fourth end edge 130d of each of the multiple projections 130.

[0055] Furthermore, as shown in Figures 9 and 10, the end portion 130f has a triangular shape in a cross section perpendicular to the pipe axis O2, with the first end edge 130a as its vertex and projecting radially inward. Thus, the end portion 130f has two surfaces forming the triangular shape: a first surface 130g and a second surface 130h. The first surface 130g and the second surface 130h are two surfaces that intersect at the first end edge 130a. The first surface 130g is located on the first side in the circumferential direction relative to the second surface 130h. The second surface 130h is located on the second side in the circumferential direction relative to the first surface 130g. The first surface 130g and the second surface 130h are formed along the removal direction (mold opening direction) of the slide mold 163. In a cross section perpendicular to the pipe axis O2, the first surface 130g and the second surface 130h are inclined with respect to a reference axis passing through the first end edge 130a and the pipe axis O2. In a cross-section perpendicular to the pipe axis O2, the first surface 130g and the second surface 130h are separated from each other radially from the inside to the outside. Furthermore, in a cross-section perpendicular to the pipe axis O2, the first edge 130a may be a fillet, and a radius (R) may be provided on the first edge 130a, and the first edge 130a may not form an acute angle. Being triangular in a cross-section perpendicular to the pipe axis O2 is not limited to being a strict triangle; for example, in a cross-section perpendicular to the pipe axis O2, it may have a first surface 130g and a second surface 130h defined starting from the first edge 130a. The first surface 130g and the second surface 130h may extend to the second end edge 130b of the projection 130. In this case, the first surface 130g and the second surface 130h are formed at an inclination with respect to the extraction direction of the slide mold 163. Furthermore, if the first end edge 130a is formed by a slide mold 163, the first end edge 130a may be inclined to approach the pipe axis O2 radially as it moves from the lower fifth end edge 130e towards the upper fourth end edge 130d. On the other hand, if the first edge 130a is formed by the upper mold 161, the first edge 130a does not have an acute angle and may be formed as a flat surface or a curved surface. In this case, the first surface 130g and the second surface 130h may not be formed.

[0056] Here, when the upper drain member 120 is injection molded in the first forming example, the slide mold 163 is pulled out horizontally (in a direction perpendicular to the pipe axis O2) from between the circumferentially positioned protrusions 130. Therefore, as shown in Figure 10, for example, the first surface 130g of one protrusion 130A can be formed by the slide mold 163A located on the first circumferential side of one protrusion 130A. In addition, the second surface 130h of one protrusion 130A can be formed by the slide mold 163B located on the second circumferential side of one protrusion 130A. As a result, the upper flange portion 121, inner cylinder portion 122, inner cylinder reduced diameter portion 123, multiple protrusions 130, and receiving portion 140 of the upper drain member 120 can be integrally formed using an upper mold 161, a lower mold 162, and multiple sliding molds 163. The debris shield portion 150 is added to the receiving portion 140 afterwards. Alternatively, the debris shield portion 150 may be molded integrally with the upper flange portion 121, inner cylinder portion 122, inner cylinder reduced diameter portion 123, and multiple protrusions 130 instead of the receiving portion 140.

[0057] Next, a second example of formation will be explained based on Figure 11. Figure 11 is a longitudinal cross-sectional view showing a second example of injection molding of the upper drain member using a mold. As shown in Figure 11, the upper drain member 120 that is injection molded in the second molding example includes an upper flange portion 121, an inner cylinder portion 122, an inner cylinder reduced diameter portion 123, and a plurality of protrusions 130. In this case, the receiving portion 140 and / or the debris-blocking portion 150 are separate molded parts. When forming this upper drain member 120, the mold 170 includes an upper mold (first mold) 171 and a lower mold 162.

[0058] The inner circumferential surface 123A of the inner cylinder reduced diameter portion 123 has a curved shape that protrudes toward the inner circumference in a cross-section including the pipe axis O2. Therefore, for example, by making the boundary between the inner circumferential surface 123A of the inner cylinder reduced diameter portion 123 and the inner cylinder portion 122 a parting line PL, the upper mold 171 and the lower mold 162 can be removed in the vertical direction to open the mold. Furthermore, the radially inner first end edges 130a of the multiple protrusions 130 are formed to be inclined with respect to the pipe axis O2, and move radially away from the pipe axis O2 as they extend from bottom to top. Therefore, when opening the upper mold 171 upward as indicated by the arrow, the first end edges 130a can be used as the draft taper of the upper mold 171. In other words, the upper mold 171 and the lower mold 162 can be opened by drafting them vertically as indicated by the arrow. As a result, the upper flange portion 121, inner cylinder portion 122, inner cylinder reduced diameter portion 123, and multiple protrusions 130 of the upper drain member 120 can be integrally formed by the upper mold 171 and the lower mold 162. The receiving portion 140 and the debris-blocking portion 150 are provided on the multiple protrusions 130.

[0059] Next, the procedure for attaching the drain member 100 described above to the gutter 10 will be explained with reference to Figures 3 and 4. As shown in Figures 3 and 4, a pilot hole (through hole) 11H for attaching the drain member 100 is formed in the bottom plate 11 of the gutter 10. Next, for example, the upper drain member 120 is inserted into the gutter 10, and the inner cylinder portion 122 is inserted into the pilot hole 11H of the gutter 10 and made to protrude downward. The stepped portion 126 of the upper flange portion 121 of the upper drain member 120 is fitted into the pilot hole 11H of the bottom plate 11 of the gutter 10 and fixed in place. For example, adhesive or a gasket is attached to the lower surface 121B of the upper flange portion 121.

[0060] Next, the outer cylinder portion 112 of the lower drain member 110 is fitted onto the upper drain member 120, and the outer thread portion 125 and the inner thread portion 115 are screwed together. Once the outer cylinder portion 112 of the lower drain member 110 is screwed onto the upper drain member 120 to a predetermined position, an installation tool (not shown) is inserted into the tool mounting recess (recess) 118 and rotated to tighten it to the predetermined position, thereby fixing the drain member 100. At this time, for example, the upper drain member 120 may be held by gripping multiple protrusions 130 or debris-blocking portions 150. In addition, ribs (projections) may be provided on the upper surface of the debris-blocking portion 150. In this case, when fixing the drain member 100, it becomes possible to grip the ribs, for example, making it easier to grip the upper drain member 120. Furthermore, the ribs can suppress the flow of debris.

[0061] According to the drain member 100, eaves gutter 10, rain gutter 1, and building Bu as described above, the following effects can be obtained. In other words, by injection molding the upper drain member 120 using the first forming example described above, the upper drain member 120 can be easily manufactured. Furthermore, when the drain member 100 manufactured in the first example is attached to the gutter 10, rainwater W (see Figure 1) flows from the inlet opening 100A of the drain member 100 to the outlet 121H. Turbulence can be generated by causing the rainwater W flowing into the outlet 121H to collide at the center of the outlet 121H. In addition, by providing debris-blocking sections 150 on multiple protrusions 130, a siphon effect can be induced in the rainwater W flowing into the outlet 121H. In this way, by generating turbulence in the rainwater W and inducing a siphon effect, the rainwater W can be allowed to flow smoothly.

[0062] Furthermore, by providing multiple protrusions 130 at the inlet opening 100A, it is possible to induce turbulence in the rainwater W as it flows from the inlet opening 100A to the outlet section 121H. This causes pressure fluctuations at the outlet section 121H, pressurizing the two-phase flow and allowing the rainwater W to flow smoothly. In addition, the inner circumferential surface 123A of the inner cylinder diameter reduction portion 123 is shaped as a curve that protrudes toward the inner circumference. Therefore, rainwater W can be smoothly flowed from the inlet opening 100A of the drain member 100 to the outlet portion 121H. As a result, by injection molding the drain member 100 in the first forming example described above, it is possible to provide a drain member 100 that allows rainwater to flow smoothly and is easy to manufacture. Furthermore, it is possible to provide a gutter 10, a rain gutter 1, and a building Bu equipped with this drain member 100.

[0063] Here, in order to allow rainwater W to flow smoothly, drainage calculations can be used to confirm whether the maximum drainage capacity obtained by the combination of the eaves gutter 10, downpipe 20, and drain member 100 meets the required drainage capacity expected from the rainfall. For example, the amount of rainfall can be obtained by calculating the roof projection area per drain (one drain outlet) from architectural drawings, etc., and multiplying it by the rainfall intensity. Furthermore, the drainage volume of the gutter 10 can be obtained from the effective drainage cross-sectional area and wetted perimeter length of the gutter 10. In addition, the drainage volume of the downpipe 20 can be obtained from the length and effective drainage cross-sectional area of ​​the downpipe 20. Therefore, since the drainage volume of the eaves gutter 10 and the downpipe 20 exceeds the amount of rainfall, it can be confirmed that the eaves gutter 10 and the downpipe 20 are meeting the required drainage volume.

[0064] Furthermore, by injection molding the upper drain member 120 using the second forming example described above, the upper drain member 120 can be easily manufactured. Furthermore, when the drain member 100 manufactured in the second example is attached to the gutter 10, rainwater W (see Figure 1) flows from the inlet opening 100A of the drain member 100 to the outlet section 121H. Turbulence can be generated by causing the rainwater W flowing into the outlet section 121H to collide at the center of the outlet section 121H. In addition, by providing debris-blocking sections 150 on multiple protrusions 130, a siphon effect can be induced in the rainwater W flowing into the outlet section 121H. This allows the rainwater W to flow smoothly.

[0065] Furthermore, by providing multiple protrusions 130 in the inlet opening 100A, it is possible to induce turbulence in the rainwater W as it flows from the inlet opening 100A to the outlet section 121H. This, for example, causes pressure fluctuations in the outlet section 121H, generating negative pressure and allowing the rainwater W to flow smoothly. In addition, the inner circumferential surface 123A of the inner cylinder diameter reduction portion 123 is shaped as a curve that protrudes toward the inner circumference. Therefore, rainwater W can be smoothly flowed from the inlet opening 100A of the drain member 100 to the outlet portion 121H. As a result, by injection molding the drain member 100 in the second molding example described above, it is possible to provide a drain member 100 that allows rainwater to flow smoothly and is easy to manufacture. Furthermore, it is possible to provide a gutter 10, a rain gutter 1, and a building Bu equipped with this drain member 100.

[0066] Furthermore, debris-blocking sections 150 are provided on multiple protrusions 130. This allows for more appropriate generation of turbulence in the rainwater W flowing into the outlet section 121H, and further allows for more appropriate induction of the siphon effect.

[0067] Furthermore, the multiple debris-blocking sections 150 are molded as separate parts from the upper flange section 121, the inner cylinder section 122, the inner cylinder reduced diameter section 123, and the multiple protrusions 130. This makes it easier to manufacture the upper drain member 120 by injection molding.

[0068] Furthermore, the multiple debris-blocking sections 150 are molded as a single unit with the upper flange section 121, the inner cylinder section 122, the inner cylinder reduced diameter section 123, and the multiple protrusions 130. This reduces the number of components in the upper drain member 120. As a result, the assembly time can be reduced.

[0069] Furthermore, the lower drain member 110 and the upper drain member 120 are made of resin. This makes the lower drain member 110 and the upper drain member 120 lighter and further increases their durability.

[0070] Furthermore, a parting line PL is provided on the inner circumferential surface of the upper drain member 120 between the inner cylinder portion 122 and the inner cylinder reduced diameter portion 123 (i.e., at the boundary). This allows the upper molds 161, 171 and the lower mold 162 to be properly removed in the vertical direction for mold opening.

[0071] Furthermore, according to the drain member 100 of this embodiment, since a fitting guide portion 113G is formed on the inner circumferential surface of the outer cylinder reduced diameter portion 113 of the lower drain member 110, the inner cylinder portion 122 of the upper drain member 120 is guided inward to the outer cylinder portion 112 without getting caught on the inner circumferential surface of the outer cylinder reduced diameter portion 113. As a result, the inner cylindrical portion 122 of the upper drain member 120 can be smoothly fitted into the outer cylindrical portion 112 of the lower drain member 110.

[0072] According to the drain member 100 of this embodiment, a positioning step portion 126 is formed on the lower surface 121B of the upper flange portion 121, so that the drain member 100 can be attached to the gutter 10 accurately and efficiently.

[0073] According to the drain member 100 of this embodiment, the length dimension L12 of the straight portion of the outer circumference of the outer cylinder portion 112 is formed to be longer than the length (depth) L0 of the receiving portion of the first elbow 12A, so that the relative positional relationship with the first elbow 12A in the direction of the pipe axis O1 can be accurately set.

[0074] Next, Modifications 1 to 4 of the drain member 100 of the embodiment will be described with reference to Figures 12 to 21. For Modifications 1 to 4, the projection 130, receiving portion 140, and debris-blocking portion 150 will be omitted in the description. In Modifications 1 to 4, the same or similar components as in the embodiment are denoted by the same reference numerals and detailed descriptions will be omitted.

[0075] <Example 1> Hereinafter, a modified example 1 of the present invention will be described with reference to Figures 12 and 13. Figure 12 is a longitudinal cross-sectional view showing the assembled drain member according to Modification 1, and Figure 13 is a longitudinal cross-sectional view showing the disassembled state. Note that Figures 12 and 13 are simplified diagrams in which the protrusion 130, receiving portion 140, and debris-blocking portion 150 of the drain member are omitted. In Figures 12 and 13, reference numeral 200 denotes the drain member, reference numeral 210 denotes the lower drain member, reference numeral 112L denotes the outer cylinder portion, reference numeral 220 denotes the upper drain member, and reference numeral 214 denotes the stepped portion.

[0076] As shown in Figures 12 and 13, the drain member 200 includes, for example, a lower drain member 210 and an upper drain member 220.

[0077] The lower drain member 210 includes, for example, a lower flange portion 111 positioned on the lower surface 11B (see Figure 3) of the gutter 10, an outer cylinder portion 112L formed below the lower flange portion 111 and extending downward, an outer cylinder reduced diameter portion 213 connected below the lower flange portion 111, a stepped portion 214 formed below the outer cylinder reduced diameter portion 213 and connecting the outer cylinder reduced diameter portion 213 and the upper end of the outer cylinder portion 112L, and an inner circumferential thread portion 115 formed on the inner circumferential surface of the outer cylinder portion 112L.

[0078] The lower drain member 210 differs from the lower drain member 110 in that it has an outer cylinder portion 112L instead of an outer cylinder portion 112, and the lower flange portion 111 and the outer cylinder portion 112L are connected by an outer cylinder diameter reduction portion 213 and a stepped portion (protruding portion) 214 instead of an outer cylinder diameter reduction portion 113. Other aspects are the same as in the embodiment, so the same reference numerals are used and their explanation is omitted.

[0079] The outer cylinder portion 112L is formed to be longer in the vertical direction than, for example, the outer cylinder portion 112 of the lower drain member 110 of the drain member 100. Specifically, it is formed to be longer than the outer cylinder portion 112 of the lower drain member 110 by a dimension corresponding to the guide sleeve 122G of the upper drain member 220. The vertical dimension of the outer cylinder portion 112L can be set arbitrarily, and may be set to be approximately the same as that of the outer cylinder portion 112.

[0080] As shown in Figures 12 and 13, the outer cylinder reduced diameter portion 213 connects the lower flange portion 111 and the outer circumference of the stepped portion 214 by decreasing in diameter as it extends downward. In this modified example, the outer cylinder reduced diameter portion 213 is formed as a substantially conical cylinder that gradually reduces in diameter linearly from the lower flange portion 111 to the outer circumference of the stepped portion 214.

[0081] The stepped portion 214 is connected to the upper end of the outer cylindrical portion 112L and consists of a roughly ring-shaped wall portion in plan view that extends horizontally toward the outer circumference. Furthermore, the outer circumference of the stepped portion 214 is connected to the lower end of the outer cylinder reduced diameter portion 213. Furthermore, the lower surface 214A of the stepped portion 214 constitutes a stopper when the outer cylinder portion 112L is fitted into a receiving portion such as an elbow (joint member).

[0082] As shown in Figures 12 and 13, the upper drain member 220 includes, for example, an upper flange portion 121 positioned on the upper surface 11A of the gutter 10 and having a drain outlet portion 121H formed on its inner circumference; an inner cylinder portion 122 formed below the upper flange portion 121 and extending downward, with an outer circumference threaded portion 125 formed on its outer circumference; an inner cylinder diameter reduction portion 123 connecting the upper flange portion 121 and the upper end of the inner cylinder portion 122 and decreasing in diameter as it extends downward; and a guide sleeve (fitting guide portion) 122G formed at the lower part of the inner cylinder portion 122.

[0083] The upper drain member 220 differs from the upper drain member 120 in that it is equipped with a guide sleeve 122G formed at the lower part of the inner cylinder portion 122. Other than that, it is the same as the upper drain member 120, so the same reference numerals are used and their explanation is omitted.

[0084] As shown in Figures 12 and 13, the guide sleeve 122G extends downward from the lower end of the outer threaded portion 125 of the inner cylinder portion 122, and its lower outer surface is formed in a cylindrical shape with the same diameter as the upper outer surface, thereby preventing contact with the inner surface 113A of the outer cylinder reduced diameter portion 213 and the upper surface 214B of the stepped portion 214. Note that the shape of the guide sleeve 122G can be arbitrarily set. For example, it may be formed in a tapered shape toward the tip (lower) side, or may have a shape combining a taper and a straight section. Also, a mound-shaped bulge that does not cause snagging in the middle may be formed.

[0085] The length L21 of the guide sleeve 122G in the direction of the tube axis O2 can be arbitrarily set, but for example, it is preferably set as follows. Specifically, the length L21 of the guide sleeve 122G is preferably set to 8 mm or more. For example, the length L21 of the guide sleeve 122G is preferably set to be longer than the height dimension L13 from the upper surface 111A of the lower flange portion 111 shown in FIG. 12 to the upper surface 214B of the positioning step portion 214. By setting L21 > L13, contact of the guide sleeve 122G with the upper surface 214B of the positioning step portion 214 can be suppressed, and the inner cylinder portion 122 can be smoothly fitted into the outer cylinder portion 112.

[0086] Also, it is preferable that the lower end portion 122T of the guide sleeve 122G is configured not to overlap at least a part of the tool mounting recess 118 formed in the outer cylinder portion 112L of the lower drain member 110. As shown in FIG. 7A, it is more preferable that the lower end portion 122T of the guide sleeve 122G is positioned above the upper bottom surface 118A of the tool mounting recess 118.

[0087] Specifically, as shown in FIG. 12, when the length L21 of the guide sleeve 122G in the direction of the tube axis O2 is set such that L21 < L14 with respect to the length dimension L14 to the upper bottom surface 118A of the tool mounting recess 118 starting from the position corresponding to the length L21 of the guide sleeve 122G, the construction tool (not shown) can be inserted up to the upper bottom surface 118A efficiently and stably during construction.

[0088] Furthermore, if the length L21 of the guide sleeve 122G is set to L21 ≤ L15 with respect to the length dimension L15 from the lower end 112T of the outer cylinder portion 112L, then the construction tool (not shown) can be engaged with the tool mounting recess 118 for construction, at least until the construction is completed. Furthermore, for example, a special tool that does not interfere with the guide sleeve 122G may be attached to the tool mounting recess 118 for installation, and when installation is performed using such a special tool, it goes without saying that the lower end portion 122T of the guide sleeve 122G may be located below the lower end portion 122T of the outer cylinder portion 112L.

[0089] Alternatively, in the drain member 200, instead of lengthening the outer cylinder portion 112L of the lower drain member 210, the vertical dimension of the outer cylinder reduced diameter portion 213 may be lengthened to adjust the vertical position between the lower end portion 122T of the guide sleeve 122G and the lower end portion 112T of the outer cylinder portion 112L or the upper bottom surface 118A of the tool mounting recess 118. In this case, by matching the length from the lower end 112T of the outer cylinder portion 112L to the lower surface 114A of the stepped portion (protruding portion) 114 with the length of the receiving opening of a joint (elbow, etc.) connected to the lower drain member 110, it becomes possible to increase the vertical dimension of the outer cylinder reduced diameter portion 213 and enlarge the diameter of the opening of the receiving hole 111H shown in Figure 5. As a result, it becomes possible to enlarge the diameter of the drop-off portion 121H formed on the upper part of the inner cylinder reduced diameter portion 123 of the upper drain member 220, thereby increasing the diameter of the drop-off portion 121H and reducing the curvature of the outer cylinder reduced diameter portion 113, i.e., the upper surface 123A, to create a smooth (gentle) curved shape.

[0090] According to the drain member 200 of Modified Example 1, the upper drain member 220 is equipped with a guide sleeve 122G formed at the lower part of the inner cylinder portion 122, so that the lower drain member 210 does not come into contact with the inner surface of the outer cylinder reduced diameter portion 213 or the stepped portion (protruding portion) 214, and the inner cylinder portion 122 can be efficiently and stably fitted toward the inner side of the outer cylinder portion 112L.

[0091] Furthermore, with respect to the drain member 200, the lower end portion 122T of the guide sleeve 122G is positioned above the upper bottom surface 118A of the tool mounting recess 118. Therefore, when assembling and installing the drain member 200, the installation tool (not shown) can be inserted all the way to the upper bottom surface 118A, allowing for efficient and stable installation.

[0092] Furthermore, with respect to the drain member 200, the length L21 of the guide sleeve 122G in the direction of the pipe axis O(O1, O2) is set to be shorter than the length L14 of the outer cylinder portion 112L of the lower drain member 210 in the direction of the pipe axis O2, so that the guide sleeve 122G is prevented from being exposed downward from the outer cylinder portion 112L.

[0093] Furthermore, with respect to the drain member 200, the lower drain member 210 is provided with a stepped portion (projection) 214 that protrudes outward on the outer circumference below the outer cylinder diameter reduction portion 213. As a result, the lower surface 214A of the stepped portion 214 abuts against the end face of the first receiving opening 60A of the first elbow portion (downstream joint) 20 connected downstream of the lower drain member 210, thereby suppressing the movement of the lower drain member 210 and the first elbow 12A relative to each other. As a result, the relative positions of the drain member 200 and the first elbow 12A can be set accurately and efficiently.

[0094] <Modification 2> Hereinafter, a modified example 2 of the present invention will be described with reference to Figures 14 and 15. Figure 14 is a longitudinal cross-sectional view showing the assembled drain member according to Modification 2, and Figure 15 is a longitudinal cross-sectional view showing the disassembled state. Note that Figures 14 and 15 are simplified diagrams of the drain member, with the protrusion 130, receiving portion 140, and debris-blocking portion 150 omitted. In Figures 14 and 15, reference numeral 300 indicates a drain member.

[0095] As shown in Figures 14 and 15, the drain member 300 includes, for example, a lower drain member 310 and an upper drain member 220. In other words, the drain member 300 is configured to combine, for example, a lower drain member 310 equipped with a fitting guide portion (continuous reduced inner diameter surface) 113G and an upper drain member 220 equipped with a guide sleeve (fitting guide portion) 122G. The upper drain member 220 is the same as in Embodiment and Modification 1, so the same reference numerals are used and its description is omitted.

[0096] As shown in Figures 14 and 15, the lower drain member 310 includes, for example, a lower flange portion 111 positioned on the lower surface 11B (see Figure 3) of the gutter 10, an outer cylinder portion 112L formed below the lower flange portion 111 and extending downward, an outer cylinder reduced diameter portion 113 connecting the lower flange portion 111 and the outer cylinder portion 112L, and an inner circumferential thread portion 115 formed on the inner circumferential surface of the outer cylinder portion 112L. The lower drain member 310 also includes a fitting guide portion 113G formed on the inner circumferential surface of the outer cylinder reduced diameter portion 113. The lower drain member 310 differs from the lower drain member 110 according to the second embodiment in that it has an outer cylinder portion 112L instead of the outer cylinder portion 112. Other than that, it is the same as in the embodiment, so the same reference numerals are used and their description is omitted.

[0097] Furthermore, while the length L21 of the guide sleeve 122G can be set arbitrarily, it is preferable to set the length L21 of the guide sleeve 122G to be longer than the height dimension L16 of the outer cylinder reduced diameter portion 113, starting from the upper surface 111A of the lower flange portion 111 shown in Figure 8A. By setting L21 > L16, the guide sleeve (insertion guide portion) 122G can be smoothly fitted into the outer cylinder portion 112.

[0098] In addition, in the drain member 300, instead of lengthening the outer cylinder portion 112L of the lower drain member 310, the vertical dimension of the outer cylinder reduced diameter portion 113 may be lengthened to adjust the vertical position between the lower end portion 122T of the guide sleeve 122G and the lower end portion 112T of the outer cylinder portion 112L or the upper bottom surface 118A of the tool mounting recess 118.

[0099] In this case, by increasing the vertical dimension of the outer cylinder reduced diameter portion 113, it becomes possible to enlarge the diameter of the opening of the receiving hole 111H shown in Figure 5. As a result, the diameter of the drain opening portion 121H formed on the upper part of the inner cylinder reduced diameter portion 123 of the upper drain member 220 is enlarged, making it possible to increase the diameter of the drain opening portion 121H and reduce the curvature of the outer cylinder reduced diameter portion 113, i.e., the upper surface 123A, to create a smooth (gentle) curved shape.

[0100] According to the drain member 300 of Modification 2, the lower drain member 310 is equipped with a fitting guide portion 113G and the upper drain member 220 is equipped with a guide sleeve 122G, so the lower drain member 310 and the upper drain member 220 can be assembled efficiently and stably.

[0101] <Variation 3> Hereinafter, a third modified example of the present invention will be described with reference to Figures 16 to 18. Figure 16 is a longitudinal cross-sectional view showing the assembled drain member according to Modification 3, and Figure 17 is a longitudinal cross-sectional view showing the disassembled state. Figure 18 is a longitudinal cross-sectional view illustrating the positioning edge portion formed on the upper drain member. Note that Figures 16 to 18 are simplified diagrams in which the projection 130, receiving portion 140, and debris-blocking portion 150 of the drain member are omitted.

[0102] In Figures 16 and 17, reference numeral 400 indicates the drain member, reference numeral 320 indicates the upper drain member, reference numeral 321 indicates the upper flange portion, and reference numeral 321E indicates the positioning edge portion (bent recess).

[0103] As shown in Figures 16 and 17, the drain member 400 includes, for example, a lower drain member 110 and an upper drain member 320. The lower drain member 110 is the same as in the embodiment, so it is given the same reference numerals and its description is omitted.

[0104] As shown in Figures 16 and 17, the upper drain member 320 includes, for example, an upper flange portion 321 positioned on the upper surface 11A of the bottom plate 11 (see Figure 3) and having a drain opening portion 121H formed on its inner circumference; an inner cylinder portion 122 formed below the upper flange portion 321 and extending downward; an inner cylinder diameter reduction portion 123 connecting the upper flange portion 121 and the upper end of the inner cylinder portion 122 and decreasing in diameter as it extends downward; and an outer circumference threaded portion 125 formed on the outer circumference of the inner cylinder portion 122.

[0105] Furthermore, the upper drain member 320 is equipped with a positioning edge portion (bent recess) 321E located on the lower surface 321B of the upper flange portion 321. As shown in Figure 18, the positioning edge portion (bent recess) 321E is formed at a position corresponding to the peripheral edge of the pilot hole 11H formed in the bottom plate 11 of the gutter 10 on the lower side surface 321B of the upper flange portion 321. Specifically, it is formed at a position corresponding to the upper surface corner portion 11E of the bottom plate 11 at the peripheral edge of the pilot hole 11H. If the shape of the pilot hole 11H is circular, the positioning edge portion (bent recess) 321E is formed as a circle with a diameter approximately the same as or slightly smaller than that of the pilot hole 11H. The positioning edge portion (bent recess) 321E is preferably in the same position as the upper surface corner portion 11E of the base plate 11, but it may also be located near the peripheral edge of the pilot hole 11H, where the flat surface on the outer periphery is stably positioned on the upper surface of the base plate with adhesive or the like sandwiched in between.

[0106] Furthermore, the positioning edge portion (bent recess) 321E is formed by the bending of the boundary between the flat lower surface (flat surface) 321B of the upper flange portion 321, which is located on the outer circumference side of the pilot hole 11H in a cross-section including the pipe axis O2, and the protruding outer surface (protruding surface) 323B of the inner cylinder reduced diameter portion 323, which is located on the inner circumference side and protrudes downward. In other words, the positioning edge portion (bent recess) 321E is formed at the connection point between the lower surface (flat surface) 321B of the upper flange portion 321 and the protruding outer surface (protruding surface) 323B of the inner cylinder reduced diameter portion 323. Furthermore, the positioning edge portion 321E is formed around the pilot hole 11H in the circumferential direction, extending over its entire circumference.

[0107] Here, the positioning edge portion (bent recess) 321E refers to a recess that opens at an angle greater than 90° where the lower intersection angle of the flat surface and the protruding surface (or the tangential direction at the boundary if the protruding surface is curved) is greater than 90°. The lower intersection angle is preferably 120° or greater, and more preferably 150° or greater. Furthermore, in order to stably engage with the upper corner of the pilot hole 11H, the intersection angle is preferably 160° or less.

[0108] Furthermore, the positioning edge portion (bent recess) 321E catches on the upper surface corner portion 11E formed on the upper surface 11A of the peripheral edge of the pilot hole 11H formed in the bottom plate 11, thereby suppressing misalignment of the upper drain member 320 relative to the pilot hole 11H and enabling the positioning of the upper drain member 320.

[0109] According to the drain member 400 of Modified Example 3, since the upper drain member 320 is equipped with a positioning edge portion (bent recess) 321E, a positioning step portion 126 based on the inner circumferential surface (inner circumferential wall surface) of the pilot hole 11H is not required, thus preventing the adhesive applied to the lower surface 121B of the upper flange portion 121 from dripping onto the inner circumferential surface of the pilot hole 11H or the lower surface of the bottom plate 11. As a result, the drain member 400 can be positioned with high quality and stability relative to the pilot hole.

[0110] Furthermore, with respect to the drain member 400, since the lower drain member 110 is equipped with a fitting guide portion 113G, the inner cylindrical portion 122 of the upper drain member 320 can be smoothly fitted into the outer cylindrical portion 112 of the lower drain member 110.

[0111] <Modification 4> Hereinafter, a modified example 4 of the present invention will be described with reference to Figures 19 and 20. Figure 19 is a longitudinal cross-sectional view showing the assembled drain member according to Modification 4, and Figure 20 is a longitudinal cross-sectional view showing the disassembled state. Note that Figures 19 and 20 are simplified diagrams in which the protrusion 130, receiving portion 140, and debris-blocking portion 150 of the drain member have been omitted. In Figures 19 and 20, reference numeral 500 indicates a drain member, and reference numeral 420 indicates an upper drain member.

[0112] As shown in Figures 19 and 20, the drain member 500 includes, for example, a lower drain member 310 and an upper drain member 420. The lower drain member 310 is the same as in the modified example 2, so the same reference numerals are used and its explanation is omitted.

[0113] As shown in Figures 19 and 20, the upper drain member 420 includes, for example, an upper flange portion 321 positioned on the upper surface 11A of the gutter 10 (see Figure 3) and having a drain outlet portion 121H formed on its inner circumference; an inner cylinder portion 122 formed below the upper flange portion 321 and extending downward, with an outer circumference threaded portion 125 formed on its outer circumference; an inner cylinder diameter reduction portion 123 connecting the upper flange portion 121 and the upper end of the inner cylinder portion 122 and decreasing in diameter as it extends downward; and a guide sleeve (fitting guide portion) 122G formed at the lower part of the inner cylinder portion 122. Furthermore, the upper drain member 420 is equipped with a positioning edge portion (bent recess) 321E located on the lower surface 321B of the upper flange portion 321.

[0114] The upper drain member 420 differs from the upper drain member 320 in that it is equipped with a guide sleeve 122G formed at the lower part of the inner cylinder portion 122. Other aspects are the same as in Modification 3, so the same reference numerals are used and their explanation is omitted.

[0115] According to the drain member 500 of Modification 4, the lower drain member 310 is equipped with an insertion guide portion (continuous reduced inner diameter surface) 113G, and the upper drain member 420 is equipped with a guide sleeve (insertion guide portion) 122G, so the upper drain member 420 can be efficiently and stably fitted into the lower drain member 310.

[0116] Furthermore, with respect to the drain member 500, since the upper drain member 420 is equipped with a positioning edge portion (bent recess) 321E, the drain member 500 can be positioned with high quality and stability relative to the pilot hole 11H.

[0117] Furthermore, in the embodiment and modified examples 1 to 4, the case in which the upper drain members 120 and 220 are provided with a positioning step portion 126 and the upper drain members 320 and 420 are provided with a positioning edge portion (bent recess) 321E has been described. However, whether or not the upper drain members are provided with a positioning step portion 126 and a positioning edge portion (bent recess) 321E can be set arbitrarily. For example, as shown in Figure 21, if the connection portion 324 between the upper flange portion 321 and the upper surface 323A of the upper drain member 320C is bent and connected, then if the upper drain member 320C is provided with a positioning edge portion (bent recess) 321E, there are bent portions above and below the flange portion 321, so stress tends to concentrate between the upper and lower bent portions. Therefore, if the connection portion 324 between the upper flange portion 321 and the upper surface 323A of the upper drain member 320C is bent and connected, it is not necessary to provide a positioning edge portion (bent recess) 321E, and the connection portion 325 between the lower side surface (flat surface) 321B of the upper flange portion 321 and the protruding outer peripheral surface (protruding surface) 323B of the inner cylinder reduced diameter portion 323 may be connected by a smooth arc without any steps or recesses.

[0118] Next, Modifications 5 to 7 of the projection 130 of the embodiment will be described with reference to Figures 22 to 24. In Modifications 5 to 7, the same or similar components as in the embodiment are denoted by the same reference numerals and detailed descriptions are omitted.

[0119] <Modification 5> Hereinafter, a modified example 5 of the present invention will be described with reference to Figure 22. Figure 22 shows a projection related to modified example 5. As shown in Figure 22, the projection 600 is a modification of the projection 130 in the embodiment, in which the first edge 130a is replaced by a first edge (edge) 600a. The first edge 600a has a convex portion 600a1, a first end face 600a2, and a second end face 600a3.

[0120] The protrusion 600a1 is positioned closest to the pipe axis O2 in the radial direction. That is, the protrusion 600a1 is a portion that protrudes radially inward. The first end face 600a2 is inclined so that it moves radially away from the pipe axis O2 as it moves from the protrusion 600a1 upward toward the fourth end edge 130d, with the protrusion 600a1 as the switching point. The second end face 600a3 is inclined so that it moves radially away from the pipe axis O2 as it moves from the protrusion 600a1 downward toward the fifth end edge 130e, with the protrusion 600a1 as the switching point.

[0121] In other words, the first edge 600a has a first end face 600a2 and a second end face 600a3 above and below the protrusion 600a1, which are inclined away from the pipe axis O2, with the protrusion 600a1 as the switching point. The first edge 600a is formed in a V-shape in the direction of the pipe axis O2, with the protrusion 600a1 as the apex. Here, the protrusion 600a1 is located at the boundary (switching point) Bo between the inner circumferential surface 123A of the inner cylinder reduced diameter portion 123 and the inner cylinder portion 122 in the upper drain member 120. The boundary Bo between the inner circumferential surface 123A and the inner cylinder portion 122 is located at the parting line PL.

[0122] In other words, the protrusion 600a1 and boundary Bo are located on the parting line PL in the direction of the pipe axis O2. Therefore, the first end face 600a2 can be used as the upper die's draft taper. The second end face 600a3 can be used as the lower die's draft taper. This allows the upper and lower dies to be properly opened at the protrusion 600a1 and boundary Bo when forming the upper drain member 120, making it easier to manufacture the upper drain member 120. Note that the protrusion 600a1 does not have to be angular and may be a fillet. The protrusion 600a1 may be formed, for example, in the part of the upper drain member 120 (inner cylinder portion 122) where the inner diameter is smallest.

[0123] Modification 5 describes an example in which the outer end 130c1 of the third end edge 130c is integrally formed with the upper flange portion 121, but is not limited to this. As another example, the entire third end edge 130c may be integrally formed with the upper surface 121A of the upper flange portion 121, the inner circumferential surface 123A of the inner cylinder reduced diameter portion 123, and the inner cylinder portion 122. In this state, the second end surface 600a3 of the first end edge 130a may be inclined to smoothly connect with the inner cylinder portion 122. Alternatively, the second end surface 600a3 of the first end edge 130a may be curved to smoothly connect with the inner cylinder portion 122.

[0124] <Variation 6> Hereinafter, a modified example 6 of the present invention will be described with reference to Figure 23. Figure 23 shows a projection related to modified example 6. As shown in Figure 23, the projection 610 is an extension of the fifth end edge (lower part) 130e of the modified example 5 to the lower end of the inner cylinder 122. The second inclined portion 610a3 of the projection 610 extends to the lower end of the inner cylinder 122. The second inclined portion 610a3 of the projection 610 may extend below the lower end of the inner cylinder 122.

[0125] <Example 7> Hereinafter, a modified example 7 of the present invention will be described with reference to Figure 24. Figure 24 shows a projection related to modified example 7. As shown in Figure 24, the projection 620 is provided with the entire fifth end edge 130e limited to the upper surface 121A of the upper flange portion 121. In the illustrated example, the projection 620 does not have the fifth end edge 130e on the inner cylinder reduced diameter portion 123 or the inner cylinder portion 122. Alternatively, the projection 620 may have the entire fifth end edge 130e on the upper surface 121A of the upper flange portion 121 and the inner circumferential surface 123A of the inner cylinder reduced diameter portion 123. Or, the fifth end edge 130e of the projection 130 may be positioned above the upper surface 121A of the upper flange portion 121.

[0126] <Connection status of the debris filter> Next, the specific connection state of the debris-blocking section 150 according to the embodiment will be explained with reference to Figure 25. Figure 25 is a perspective view showing the specific connection state of the debris-blocking section according to the embodiment. As shown in Figure 25, the debris shield 150 is connected to the receiving portion 140 from above. The receiving portion 140 is integrally formed on the fourth end edge 130d of the multiple protrusions 130. The receiving portion 140 is formed, for example, in an annular shape with a constant thickness. The debris shield 150 is formed, for example, on a disc. The debris shield 150 is retrofitted to the upper surface 140b of the receiving portion 140 from above by, for example, a fitting structure, adhesive, welding, etc. Alternatively, as a configuration for connecting the debris shield 150, the receiving portion 140 may have protrusions that fit into the debris shield 150. The debris-blocking portion 150 may be integrally formed with the multiple protrusions 130 and receiving portions 140.

[0127] Next, modified examples 8 and 9 of the connection state of the debris-blocking section of the embodiment will be described with reference to Figures 26 to 27. In modified examples 8 and 9, the same or similar components as in the embodiment are denoted by the same reference numerals and detailed explanations are omitted.

[0128] <Differentiation Example 8> Hereinafter, a modified example 8 of the present invention will be described with reference to Figure 26. Figure 26 is a perspective view showing the connection state of the debris-blocking section according to Modification 8. As shown in Figure 26, the debris-blocking section 150 is provided on the receiving section 650 from below. The receiving section 650 supports the debris-blocking section 150 from above. The receiving section 650 is individually provided on the fourth end edge 130d of the multiple protrusions 130. The inner end portion 650a of the receiving section 650 protrudes radially inward from the fourth end edge 130d of the protrusion 130 toward the pipe axis O2. The debris-blocking section 150 is provided on the inner end portion 650a of the multiple receiving sections 650 from below. Specifically, the outer peripheral edge 150a of the debris-blocking section 150 is retrofitted to the inner end portion 650a of the multiple receiving sections 650 from below by means of a fitting structure, adhesive, welding, etc.

[0129] <Modification 9> Hereinafter, a modified example 9 of the present invention will be described with reference to Figures 27 and 28. Figure 27 shows the connection state of the debris-blocking section according to modified example 9. Figure 28 is a plan view of the connection state of the debris-blocking section in Figure 27, as seen from arrow C. As shown in Figures 27 and 28, the debris-blocking section 150 has a plurality of recesses 151 on its outer peripheral edge 150a. The plurality of recesses 151 are fitted onto the first end edge 130a of the projection 130. In this way, the debris-blocking section 150 is retrofitted to the plurality of projections 130.

[0130] It should be noted that the technical scope of the present invention is not limited to the embodiments described above, and various modifications can be made without departing from the spirit of the invention.

[0131] For example, the outer cylinder diameter reduction portion 113 may be omitted. For example, the positioning edge portion (bent recess) 321E may be omitted. For example, the boundary between the flat lower surface (flat surface) 321B of the upper flange portion 321 and the protruding outer surface (protruding surface) 323B of the inner cylinder reduced diameter portion 323, which is located on the inner circumference side and protrudes downward, may be tangent. In this case as well, for example, the adhesive applied to the lower surface 121B of the upper flange portion 121 will not drip onto the inner circumference surface of the pilot hole 11H or the lower surface of the bottom plate 11.

[0132] For example, it is not necessary to have a guide sleeve 122G. In this case, a protrusion may be provided on the inner surface of the outer cylinder reduced diameter portion 213 connected below the lower flange portion 111 of the lower drain member 210 to guide the insertion of the lower end of the upper drain member 220.

[0133] Furthermore, it is possible to replace the components in this embodiment with well-known components as appropriate, without departing from the spirit of the present invention.

[0134] (Note) The above embodiment can be understood, for example, as follows:

[0135] <1> A drain member according to one aspect of the present invention comprises a lower drain member having a lower flange portion and an outer cylindrical portion formed below the lower flange portion and extending downward, and an upper drain member having an upper flange portion, an inner cylindrical portion formed below the upper flange portion and extending downward and fitted into the outer cylindrical portion, an inner cylindrical diameter reduction portion connecting the upper flange portion and the upper end of the inner cylindrical portion and decreasing in diameter as it extends downward, and a plurality of projections provided in the circumferential direction that protrude upward from the upper flange portion, wherein the upper flange portion, the inner cylindrical portion, the inner cylindrical diameter reduction portion and the projections are integrally formed, the inner circumferential surface of the inner cylindrical diameter reduction portion has a curve that protrudes toward the inner circumferential side in a cross-section including the pipe axis, and the radial inner edge of the projection is inclined with respect to the pipe axis and moves radially away from the pipe axis as it extends from below to above.

[0136] In the drain member, the radial inner edge of the protrusion moves radially away from the pipe axis as it slopes upward from below with respect to the pipe axis. Therefore, when integrally forming the upper flange portion, inner cylinder portion, inner cylinder reduced diameter portion, and protrusion, for example, when using a mold equipped with an upper mold and a lower mold that are divided in the vertical direction, the radial inner edge of the protrusion can be used as the draft taper of the upper mold.

[0137] <2> A drain member according to one aspect of the present invention includes a lower drain member having a lower flange portion and an outer cylindrical portion formed below the lower flange portion and extending downward, and an upper drain having an upper flange portion, an inner cylindrical portion formed below the upper flange portion and extending downward and fitted into the outer cylindrical portion, an inner cylindrical diameter reduction portion connecting the upper flange portion and the upper end of the inner cylindrical portion and decreasing in diameter as it extends downward, and a plurality of projections protruding upward from the upper flange portion and provided in the circumferential direction. The member comprises the upper flange portion, the inner cylinder portion, the inner cylinder reduced diameter portion, and the projection portion, and the inner circumferential surface of the inner cylinder reduced diameter portion has a curve that protrudes toward the inner circumferential side in a cross-section including the pipe axis, and the radially inner edge of the projection portion has a portion that protrudes radially inward, and the portion that slopes away from the pipe axis radially as it moves upward from the projection portion, and slopes away from the pipe axis radially as it moves downward from the projection portion.

[0138] The drain member has a protruding portion at the radially inner edge of the projection, with the protruding portion projecting radially inward. Furthermore, the first end face above the protruding portion is inclined so that it moves radially away from the pipe axis as it extends upward. In addition, the second end face below the protruding portion is inclined so that it moves radially away from the pipe axis as it extends downward. Therefore, the first and second end faces can be used as the mold's draft taper. This allows the mold to be opened appropriately when forming the upper drain member, making it easier to manufacture the upper drain member.

[0139] <3> A drain member according to one aspect of the present invention comprises a lower drain member having a lower flange portion and an outer cylindrical portion formed below the lower flange portion and extending downward, and an upper drain member having an upper flange portion, an inner cylindrical portion formed below the upper flange portion and extending downward and fitted into the outer cylindrical portion, an inner cylindrical diameter reduction portion connecting the upper flange portion and the upper end of the inner cylindrical portion and decreasing in diameter as it extends downward, and a plurality of projections protruding upward from the upper flange portion and provided in the circumferential direction, wherein the upper flange portion, the inner cylindrical portion, the inner cylindrical diameter reduction portion and the projections are integrally formed, the inner circumferential surface of the inner cylindrical diameter reduction portion forms a curve that protrudes inward in a cross-section including the pipe axis, and the radial inner end of the projection has a triangular shape that protrudes radially inward with the edge as the apex in a cross-section perpendicular to the pipe axis.

[0140] In the drain member, the radially inner end of the projection forms a triangular shape with the edge as the vertex, projecting radially inward in a cross-section perpendicular to the pipe axis. Here, the two surfaces forming the triangular shape that intersect at the edge are designated as the first surface and the second surface, respectively, with the first surface located on the first side in the circumferential direction relative to the second surface, and the second surface located on the second side in the circumferential direction relative to the first surface. In this case, when integrally forming the upper flange portion, inner cylinder portion, inner cylinder reduced diameter portion, and projection, for example, when a slide mold is pulled horizontally from between multiple projections in the circumferential direction, the first surface of one projection can be formed by a slide mold located on the first side in the circumferential direction relative to one projection, and the second surface of one projection can be formed by a slide mold located on the second side in the circumferential direction relative to one projection.

[0141] <4> the above <1> from <3> A drain member relating to any one of the above may further include a plurality of debris-blocking portions provided on the protrusions.

[0142] The drain component is equipped with debris-blocking sections on multiple protrusions. This allows for more appropriate generation of turbulence in the rainwater flowing into the outlet, and furthermore, for more appropriate induction of the siphon effect.

[0143] <5> the above <1> from <3> In a drain member relating to any one of the above, a plurality of debris-blocking portions provided on the protrusions are further provided, and the debris-blocking portions may be molded products separate from the upper flange portion, the inner cylinder portion, the inner cylinder reduced diameter portion, and the protrusions.

[0144] In the drain component, multiple debris-blocking sections are molded as separate parts from the upper flange section, inner cylinder section, inner cylinder reduced diameter section, and multiple protrusions. This makes it easier to manufacture the upper drain component by injection molding.

[0145] <6> the above <3> The drain member further comprises a plurality of debris-blocking portions provided on the protrusions, and the debris-blocking portions may be molded integrally with the upper flange portion, the inner cylinder portion, the inner cylinder reduced diameter portion, and the protrusions.

[0146] In the drain member, multiple debris-blocking sections are molded as a single unit with the upper flange section, inner cylinder section, inner cylinder reduced diameter section, and multiple protrusions. This reduces the number of components in the upper drain member, thereby reducing the assembly time.

[0147] <7> the above <1> from <3> In a drain member relating to any one of the above, the lower drain member and the upper drain member may be made of resin.

[0148] In the drain component, the lower and upper drain components are made of resin. This makes the lower and upper drain components lighter and increases their durability.

[0149] <8> the above <1> from <3> In the drain member relating to any one of the above, a parting line may be provided on the inner circumferential surface of the upper drain member between the inner cylinder portion and the inner cylinder reduced diameter portion.

[0150] In the drain member, a parting line is provided on the inner circumferential surface of the upper drain member between the inner cylinder portion and the inner cylinder diameter reduction portion. This allows the mold to be properly removed and opened.

[0151] <9> An eaves gutter according to one aspect of the present invention has a bottom plate and side plates extending upward from both ends in the width direction of the bottom plate, and a pilot hole formed in the bottom plate is <1> from <3> A drain component relating to one of the following is installed.

[0152] <10> A rain gutter according to one aspect of the present invention comprises a eaves gutter, a drain member according to any one of claims 1 to 3 installed on the bottom plate of the eaves gutter, and a downpipe connected to the outer cylinder portion.

[0153] <11> A rain gutter according to one aspect of the present invention is the above <1> from <3> The system comprises a drain member as described in any one of the above, a first elbow connected to the lower drain member of the drain member, a downpipe connected to the lower drain member via the first elbow, a second elbow connected to the downpipe, and a downpipe connected to the downpipe via the second elbow.

[0154] <12> A rain gutter according to one aspect of the present invention is the above <1> from <3> It is equipped with a gutter on which one of the drain members described in one of the following is installed.

[0155] <13> A rain gutter according to one aspect of the present invention is the above <1> from <3> It is equipped with a downpipe to which one of the drain members described in any one of the above is connected.

[0156] <14> A building according to one aspect of the present invention comprises a roof with eaves, a gutter positioned at the eaves, a drain member according to any one of claims 1 to 3 installed on the bottom surface of the gutter, and a downpipe connected to the outer cylindrical portion protruding downward from the bottom of the gutter.

[0157] <15> A building according to one aspect of the present invention is the above <14> In the building concerned, a catch basin to which the lower end of the downpipe is connected may be provided. [Explanation of Symbols]

[0158] 1…Rain gutter 10...Eave gutter 11...Bottom plate (bottom surface, bottom part) 12... Gutter 12A...First Elbow 12B...2nd Elbow 15...Front wall (side plate) 16...Rear wall (side plate) 20...Vertical gutter 20a... Upper end of the downpipe 20b...Lower end of downpipe 80...Catch basin 100, 200, 300, 400, 500... Drain components 111...Lower flange section 110...Lower drain member 112... Outer cylinder part 120... Upper drain member 121... Upper flange section 122... Inner cylinder 123...Inner cylinder reduced diameter section 123A... Inner circumferential surface of the reduced diameter portion of the inner cylinder 130, 600, 610, 620… protrusions 130a, 600a... First edge (edge) 130g…1st side 130h…Second side 140,650...receiving part 150... Garbage-blocking section 600a1...Convex portion (a part that protrudes radially inward) 600a2…1st end surface 600a3…Second end surface Bu... building O1...Pipe axis of the lower drain member O2... Pipe axis of the upper drain member PL...Parting line

Claims

1. A lower drain member having a lower flange portion and an outer cylindrical portion formed below the lower flange portion and extending downward, An upper drain member having an upper flange portion, an inner cylinder portion formed below the upper flange portion and extending downward and fitted into the outer cylinder portion, an inner cylinder diameter reduction portion connecting the upper flange portion and the upper end of the inner cylinder portion and decreasing in diameter as it extends downward, and a plurality of protrusions projecting upward from the upper flange portion and provided in the circumferential direction, Equipped with, The upper flange portion, the inner cylinder portion, the inner cylinder reduced diameter portion, and the protrusion are integrally formed. The inner circumferential surface of the reduced diameter portion of the inner cylinder has a curved shape that protrudes toward the inner circumferential side in a cross-section including the pipe axis. A drain member in which the radially inner edge of the projection is inclined with respect to the pipe axis and moves radially away from the pipe axis as it extends from below to above.

2. A lower drain member having a lower flange portion and an outer cylindrical portion formed below the lower flange portion and extending downward, An upper drain member having an upper flange portion, an inner cylinder portion formed below the upper flange portion and extending downward and fitted into the outer cylinder portion, an inner cylinder diameter reduction portion connecting the upper flange portion and the upper end of the inner cylinder portion and decreasing in diameter as it extends downward, and a plurality of protrusions projecting upward from the upper flange portion and provided in the circumferential direction, Equipped with, The upper flange portion, the inner cylinder portion, the inner cylinder reduced diameter portion, and the protrusion are integrally formed. The inner circumferential surface of the reduced diameter portion of the inner cylinder has a curved shape that protrudes toward the inner circumferential side in a cross-section including the pipe axis. A drain member wherein the radially inner edge of the projection has a portion that protrudes radially inward, and the projection is inclined to move radially away from the pipe axis as it extends upward from the projection, and to move radially away from the pipe axis as it extends downward from the projection.

3. A lower drain member having a lower flange portion and an outer cylindrical portion formed below the lower flange portion and extending downward, An upper drain member having an upper flange portion, an inner cylinder portion formed below the upper flange portion and extending downward and fitted into the outer cylinder portion, an inner cylinder diameter reduction portion connecting the upper flange portion and the upper end of the inner cylinder portion and decreasing in diameter as it extends downward, and a plurality of protrusions projecting upward from the upper flange portion and provided in the circumferential direction, Equipped with, The upper flange portion, the inner cylinder portion, the inner cylinder reduced diameter portion, and the protrusion are integrally formed. The inner circumferential surface of the reduced diameter portion of the inner cylinder has a curved shape that protrudes toward the inner circumferential side in a cross-section including the pipe axis. The inner radial end of the projection is a drain member that, in a cross-section perpendicular to the pipe axis, forms a triangular shape with the edge as the apex, projecting radially inward.

4. The drain member according to any one of claims 1 to 3, further comprising a plurality of debris-blocking portions provided on the aforementioned protrusions.

5. The device further comprises debris-blocking sections provided on multiple of the aforementioned protrusions, The drain member according to any one of claims 1 to 3, wherein the debris-removing portion is a molded product separate from the upper flange portion, the inner cylinder portion, the inner cylinder reduced diameter portion, and the protrusion portion.

6. The device further comprises debris-blocking sections provided on multiple of the aforementioned protrusions, The drain member according to any one of claims 1 to 3, wherein the debris-removing portion is a molded product integral with the upper flange portion, the inner cylinder portion, the inner cylinder reduced diameter portion, and the protrusion portion.

7. The drain member according to any one of claims 1 to 3, wherein the lower drain member and the upper drain member are made of resin.

8. The drain member according to any one of claims 1 to 3, wherein a parting line is provided on the inner circumferential surface of the upper drain member between the inner cylinder portion and the inner cylinder reduced diameter portion.

9. A gutter comprising a base plate and side plates extending upward from both ends in the width direction of the base plate, wherein a drain member according to any one of claims 1 to 3 is fitted into a pilot hole formed in the base plate.

10. Eaves gutter and, A drain member according to any one of claims 1 to 3, installed on the bottom plate of the eaves gutter, A rain gutter comprising a downpipe connected to the aforementioned outer cylindrical portion.

11. A drain member according to any one of claims 1 to 3, The first elbow connected to the lower drain member of the drain member, A drainpipe connected to the lower drain member via the first elbow, The second elbow connected to the aforementioned downpipe, A rain gutter comprising a downpipe connected to the downpipe via the second elbow.

12. A rain gutter comprising a gutter on which a drain member according to any one of claims 1 to 3 is installed.

13. A rain gutter comprising a downpipe to which a drain member according to any one of claims 1 to 3 is connected.

14. A roof with eaves, The gutter positioned at the eaves, A drain member according to any one of claims 1 to 3, installed on the bottom surface of the eaves gutter, A building comprising a downpipe connected to the outer cylindrical portion that protrudes downward from the bottom of the eaves gutter.

15. The building according to claim 14, comprising a catch basin to which the lower end of the downpipe is connected.

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