drain

Abstract

To provide a drain that facilitates installation and improves joint strength. [Solution] The drain 1 includes a first member 5 which includes a drain pipe 2 having a first cylindrical portion 21 and a male threaded portion 24 on the outer circumferential surface of the first cylindrical portion 21, and a second member 6 which includes a second cylindrical portion 61 which houses the first cylindrical portion 21 inside and a female threaded portion 64 on the inner circumferential surface of the second cylindrical portion 61 which is connected to the male threaded portion 24. The male threaded portion 24 is located in the direction of the first central axis C21 of the first cylindrical portion 21, from the downstream end 21b of the first cylindrical portion 21 toward the upstream end 21a of the first cylindrical portion 21. The male threaded portion 24 includes a first male threaded portion 241 and a second male threaded portion 242 between the first male threaded portion 241 and the downstream end 21b of the first cylindrical portion 21. If the height of the thread 241a of the first male thread portion 241 is h1, and the height of the thread 242a of the second male thread portion 242 is h2, then h2

Description

Technical Field

[0001] This disclosure relates to a drain.

Background Art

[0002] Patent Document 1 discloses a siphon drain member attached to a circular lower hole formed in the bottom surface of an eaves gutter. The siphon drain member includes a lower drain member, an upper drain member, and a siphon portion disposed above the upper drain member, and is attached to the eaves gutter. The lower drain member is disposed on the lower surface side of the bottom plate of the eaves gutter, and the upper drain member is disposed on the upper surface side of the bottom plate. The upper drain member includes an upper flange disposed on the upper surface of the eaves gutter and having a dropping port formed on the inner peripheral side, an inner cylinder portion formed below the upper flange and extending downward with an outer peripheral screw portion formed on the outer peripheral surface, an inner cylinder diameter-reducing portion connecting the upper flange and the upper end portion of the inner cylinder portion and having a reduced diameter as it goes downward, and a guide sleeve (insertion guide portion) formed at the lower portion of the inner cylinder portion.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Patent Document 1 describes that "the guide sleeve (insertion guide portion) extends downward from the lower end portion of the outer peripheral screw portion of the inner cylinder portion, and the outer peripheral surface on the lower side is formed in a cylindrical shape with the same diameter as the outer peripheral surface on the upper side, so that contact with the inner peripheral surface of the outer cylinder diameter-reducing portion or the upper surface of the stepped portion is suppressed."

[0005] Since the guide sleeve does not have a threaded portion in order to enable the upper drain member to be efficiently and stably inserted into the lower drain member, it does not contribute to the bonding strength between the upper drain member and the lower drain member. On the contrary, the bonding strength is reduced by reducing the threaded portion in order to provide the guide sleeve.

[0006] The present disclosure provides a drain that enables easier installation work and improved bonding strength.

Means for Solving the Problems

[0007] A drain according to one aspect of the present disclosure includes a first member including a first cylindrical portion disposed at the inlet of the eaves gutter, a first flange extending outward from the upstream end of the first cylindrical portion, and a drain cylindrical portion having a male screw portion on the outer peripheral surface of the first cylindrical portion; a second member including a second cylindrical portion disposed inside the first cylindrical portion, a second flange extending outward from the upstream end of the second cylindrical portion and sandwiching the peripheral edge of the inlet in the eaves gutter between the second flange and the first flange, and a female screw portion on the inner peripheral surface of the second cylindrical portion that is coupled to the male screw portion; and The male screw portion is present in the direction of the first central axis of the first cylindrical portion from the downstream end of the first cylindrical portion toward the upstream end of the first cylindrical portion. The male screw portion includes a first male screw portion and a second male screw portion between the first male screw portion and the downstream end of the first cylindrical portion. Let the height of the thread crest of the first male screw portion be h1, and the height of the thread crest of the second male screw portion be h2. Then h2 < h1 is satisfied.

[0008] A drain according to one aspect of the present disclosure includes a first member including a first cylindrical portion disposed at the inlet of the eaves gutter, a first flange extending outward from the upstream end of the first cylindrical portion, and a drain cylindrical portion having a male screw portion on the outer peripheral surface of the first cylindrical portion; A second cylindrical portion having a first cylindrical portion positioned inside, a second flange extending outward from the upstream end of the second cylindrical portion and sandwiching the peripheral edge of the inlet of the gutter between itself and the first flange, and a second member having a female screw portion on the inner circumferential surface of the second cylindrical portion that connects to a male screw portion, Equipped with, The male thread portion is located in the direction of the first central axis of the first cylindrical portion, from the downstream end of the first cylindrical portion toward the upstream end of the first cylindrical portion. The female thread portion includes a first female thread portion and a second female thread portion between the first female thread portion and the downstream end of the second cylindrical portion. The height of the threads in the first female screw section is h3. If the height of the threads in the second female thread section is h4, The condition h4 > h3 is satisfied.

[0009] A drain relating to one aspect of this disclosure is A first member including a drain pipe section having a first cylindrical section positioned at the inlet of the eaves gutter, a first flange extending outward from the upstream end of the first cylindrical section, and a male threaded section on the outer circumferential surface of the first cylindrical section, A second cylindrical portion having a first cylindrical portion positioned inside, a second flange extending outward from the upstream end of the second cylindrical portion and sandwiching the peripheral edge of the inlet of the gutter between itself and the first flange, and a second member having a female screw portion on the inner circumferential surface of the second cylindrical portion that connects to a male screw portion, Equipped with, The male thread portion is located in the direction of the first central axis of the first cylindrical portion, from the downstream end of the first cylindrical portion toward the upstream end of the first cylindrical portion. The male threaded portion includes a first male threaded portion and a second male threaded portion between the first male threaded portion and the downstream end of the first cylindrical portion. The female thread portion includes a first female thread portion connected to the first male thread portion, and a second female thread portion located between the first female thread portion and the downstream end of the second cylindrical portion, which is connected to the second male thread portion. The height of the threads in the first male screw section is h1. The height of the threads in the second male screw section is h2. The height of the first female thread section is h3. If the height of the second female thread section is h4, h2 ​h4 > h3, satisfies

Advantages of the Invention

[0010] Aspects of the present disclosure enable easier installation work and improved bonding strength.

Brief Description of the Drawings

[0011] [Figure 1] Schematic diagram of an eaves gutter drainage structure including a drain according to an embodiment [Figure 2] Cross-sectional view of an eaves gutter drainage structure including a drain according to an embodiment [Figure 3] Enlarged view of the part shown at P1 in FIG. 2 [Figure 4] Perspective view of the first member of the drain according to an embodiment [Figure 5] Plan view of the first member of the drain according to an embodiment [Figure 6] Bottom view of the first member of the drain according to an embodiment [Figure 7] Side view of the first member of the drain according to an embodiment [Figure 8] Cross-sectional view of the first member of the drain according to an embodiment [Figure 9] Enlarged view of the part shown at P2 in FIG. 8 [Figure 10] Perspective view of the second member of the drain according to an embodiment [Figure 11] Schematic diagram of an eaves gutter drainage structure according to Modification 1 [Figure 12] Schematic diagram of an eaves gutter drainage structure according to Modification 2 [Figure 13] Schematic diagram of an eaves gutter drainage structure according to Modification 3

Modes for Carrying Out the Invention

[0012] [1. Embodiment] The embodiments of this disclosure will be described below, with reference to the drawings as appropriate. However, the embodiments described below are illustrative examples for illustrating this disclosure and are not intended to limit this disclosure to the following (for example, the shape, dimensions, arrangement, etc., of each component). Unless otherwise specified, positional relationships such as up, down, left, and right shall be based on the positional relationships shown in the drawings. The figures described in the embodiments below are schematic diagrams, and the ratios of the size and thickness of each component in each figure do not necessarily reflect the actual dimensional ratios. Furthermore, the dimensional ratios of each element are not limited to the ratios shown in the drawings.

[0013] In the following explanation, when it is necessary to distinguish between multiple components, prefixes such as "1st," "2nd," etc., will be added to the names of the components. However, if the components can be distinguished from each other by the symbols attached to them, prefixes such as "1st," "2nd," etc., may be omitted for the sake of readability.

[0014] In the following explanation, when it is necessary to distinguish between multiple components, suffixes such as "-1" and "-2" will be added to the component symbols. However, when it is not necessary to distinguish between multiple components, suffixes such as "-1" and "-2" may be omitted for the sake of readability.

[0015] [1.1 Structure] Figure 1 is a schematic diagram of a gutter drainage structure 100 including a drain 1 according to one embodiment.

[0016] The eaves gutter drainage structure 100 is a piping system for transporting fluids with a Reynolds number of 4000 or higher. Fluids with a Reynolds number of 4000 or higher can be described as fluids whose flow within a cylinder becomes turbulent. Examples of such fluids include liquids (drinking water, heat source water, wastewater, oil, etc.), gases (air, steam, etc.), and gas-liquid two-phase flow (mixture of liquid and gas). The eaves gutter drainage structure 100 constitutes a rain gutter system that receives rainwater from the roof 210 of a building 200 and directs it to a drain section 310 on the ground 300. The rainwater collected in the drain section 310 flows out of the drain section 310 through an underground pipe 320 into a rainwater pipe. The building 200 is, for example, a non-residential facility such as a shop, office, factory, building, school, welfare facility, or hospital, and a residential facility such as a detached house, apartment building, or individual dwelling units in a detached house or apartment building. Non-residential facilities include theaters, cinemas, public halls, amusement facilities, multi-purpose complexes, department stores, hotels, inns, kindergartens, libraries, museums, art galleries, underground shopping areas, train stations, and airports. The roof 210 may be a flat roof or a corrugated metal roof. In Figure 1, the roof 210 is a corrugated metal roof.

[0017] The eaves gutter drainage structure 100 comprises a drain 1, an eaves gutter 10, a vertical pipe 11, and a socket 12.

[0018] The gutter 10 receives rainwater from the roof 210 of the building 200. The gutter 10 is installed under the roof 210 of the building 200. For example, the gutter 10 is positioned at the eaves of the roof 210. In particular, the gutter 10 is positioned to extend along the eaves of the roof 210. The gutter 10 is a long, barrel-shaped structure. The gutter 10 has a bottom wall 10a. An inlet 10b is formed in the bottom wall 10a. The inlet 10b is, for example, a circular opening. In a rain gutter system, the inlet 10b is also called a water collection opening, drainage opening, or outlet. For example, the gutter 10 may be formed by extrusion molding of a resin material. The gutter 10 may have a core material to reinforce the overall strength of the gutter 10. The core material may be, for example, metal. Alternatively, the gutter 10 may be formed from a metal sheet, for example, a steel sheet (also called a coil).

[0019] Drain 1 is positioned at the inlet 10b of the gutter 10. Drain 1 is used to reduce the generation of vortices and the entrainment of air at the inlet 10b. Drain 1 comprises a first member 5 and a second member 6. The first member 5 is an upper member that defines the upper structure of drain 1, and the second member 6 is a lower member that defines the upper structure of drain 1.

[0020] Figure 2 is a cross-sectional view of the gutter drainage structure 100 including the drain 1. In Figure 2, the vertical pipe 11 and socket 12 are not shown. Figure 3 is an enlarged view of the part indicated by P1 in Figure 2. Figure 4 is a perspective view of the first member 5 of the drain 1. Figure 5 is a plan view of the first member 5 of the drain 1. Figure 6 is a bottom view of the first member 5 of the drain 1. Figure 7 is a side view of the first member 5 of the drain 1. Figure 8 is a cross-sectional view of the first member 5 of the drain 1. Here, Figure 2 is a cross-sectional view along line AA in Figure 5, and Figure 8 is a cross-sectional view along line BB in Figure 5. Figure 9 is an enlarged view of the part indicated by P2 in Figure 8.

[0021] The first component 5 comprises a drain pipe portion 2, a funnel portion 3, and one or more blades 4. In this embodiment, the first component 5 comprises five blades 4.

[0022] As shown in Figure 2, the drain pipe section 2 has an upstream end 2a and a downstream end 2b. The drain pipe section 2 further has a drain outlet 2c. The drain outlet 2c is the internal space between the upstream end 2a and the downstream end 2b of the drain pipe section 2.

[0023] As shown in Figures 2 and 4, the drain pipe section 2 comprises a first cylindrical section 21 and a first flange 22. The first cylindrical section 21 is positioned at the inlet 10b of the gutter 10. The first cylindrical section 21 has an upstream end 21a and a downstream end 21b. The first cylindrical section 21 is cylindrical in shape, with no change in inner or outer diameter. The first flange 22 extends outward from the upstream end 21a of the first cylindrical section 21. More specifically, the first flange 22 is located at the upstream end 21a of the first cylindrical section 21 and extends radially outward from the first cylindrical section 21. The first flange 22 is annular in shape.

[0024] The inner diameter D of the first cylindrical section 21 (see Figure 2) defines the inner diameter of the drain outlet 2c. The inner diameter D of the drain outlet 2c may be set appropriately according to the dimensions of the piping connected to the drain 1. The dimensions of the piping, for example, the outer diameter and thickness, may be set in accordance with the standard for rigid polyvinyl chloride pipes (general) of JIS K 6741 "Rigid polyvinyl chloride pipes".

[0025] Table 1 shows an example of nominal diameters for VP rigid polyvinyl chloride pipes in the JIS K 6741 standard for rigid polyvinyl chloride pipes (general). In Table 1, the units for outer diameter (standard dimension), thickness (minimum dimension), and approximate inner diameter are mm.

[0026] [Table 1]

[0027] Table 2 shows an example of nominal diameters for VU rigid polyvinyl chloride pipes in the JIS K 6741 standard for rigid polyvinyl chloride pipes (general). In Table 2, the units for outer diameter (standard dimension), thickness (minimum dimension), and approximate inner diameter are mm.

[0028] [Table 2]

[0029] The inner diameter D of the first cylindrical section 21 may be set based on an approximate inner diameter corresponding to the nominal diameter of the piping. In this embodiment, the inner diameter D of the first cylindrical section 21 (i.e., the inner diameter of the outlet 2c) may be set to satisfy 70 mm ≤ D ≤ 150 mm. For example, the inner diameter D of the outlet 2c may be set to correspond to a nominal diameter of 75 mm, 100 mm, or 125 mm.

[0030] As can be seen from Figures 5 and 6, the central axis C2 of the drain pipe section 2 coincides with the central axis (first central axis) C21 of the first pipe section 21 and the central axis C22 of the first flange 22.

[0031] In the drain pipe section 2, the first flange 22 defines the upstream end 2a, and the downstream end 21b of the first pipe section 21 defines the downstream end 2b.

[0032] In this embodiment, a first connecting portion 23 is located between the upstream end 21a of the first cylindrical portion 21 and the first flange 22. The first connecting portion 23 is cylindrical in shape, with its inner diameter gradually increasing from the first cylindrical portion 21 toward the first flange 22. Therefore, in a cross-section passing through the central axis C2 of the drain pipe portion 2, the inner circumferential surface of the first connecting portion 23 is a smooth, arc-shaped curved surface.

[0033] The drain pipe section 2 further includes a male threaded section 24. The male threaded section 24 is located on the outer circumferential surface of the first pipe section 21. The male threaded section 24 is used to connect the first member 5 and the second member 6.

[0034] As shown in Figures 2 to 4, the male threaded portion 24 is located in the direction of the first central axis C21 of the first cylindrical portion 21, extending from the downstream end 21b of the first cylindrical portion 21 to the upstream end 21a of the first cylindrical portion 21. In this embodiment, if the length of the first cylindrical portion 21 in the direction of the first central axis C21 is L and the length of the male threaded portion 24 in the direction of the first central axis C21 is L1, then L1 ≥ 0.5L is desirable, L1 ≥ 0.7L is preferable, and L1 ≥ 0.9L is more preferable. This ensures a sufficient length of the male threaded portion 24, thereby improving the bonding strength between the first member 5 and the second member 6.

[0035] The male screw portion 24 includes a first male screw portion 241 and a second male screw portion 242. The second male screw portion 242 is between the first male screw portion 241 and the downstream end portion 21b of the first cylindrical portion 21. The first male screw portion 241 is the portion of the male screw portion 24 on the upstream end portion 21a side of the first cylindrical portion 21. The second male screw portion 242 is the portion of the male screw portion 24 on the downstream end portion 21b side of the first cylindrical portion 21. As shown in FIG. 3, the first male screw portion 241 is defined by a thread 241a, and the second male screw portion 242 is defined by a thread 242a. In the present embodiment, the pitch of the thread 241a of the first male screw portion 241 is equal to the pitch of the thread 242a of the second male screw portion 242. The height of the thread 242a of the second male screw portion 242 is lower than the height of the thread 241a of the first male screw portion 241. Here, the lower the height of the thread of the screw portion, the easier the installation work becomes, but the coupling strength decreases. That is, the first male screw portion 241 contributes more to improving the coupling strength between the first member 5 and the second member 6 than the second male screw portion 242, and the second male screw portion 242 contributes more to facilitating the installation work between the first member 5 and the second member 6 than the first male screw portion 241.

[0036] The thread 241a of the first male screw portion 241 and the thread 242a of the second male screw portion 242 are continuous. That is, the threads 241a and 241b are formed by the height of the thread decreasing in the middle. This enables smooth movement from the second male screw portion 242 to the first male screw portion 241, and enables the installation work between the first member 5 and the second member 6 to be facilitated.

[0037] The height of the thread 242a of the second male screw portion 242 decreases as it approaches the downstream end portion 21b of the first cylindrical portion 21. This enables the installation work between the first member 5 and the second member 6 to be facilitated.

[0038] The male screw portion 24 is configured to satisfy the following dimensions. Let the height of the thread 241a of the first male screw portion 241 be h1, and the height of the thread 242a of the second male screw portion 242 be h2. The male screw portion 24 satisfies h2 < h1, and preferably satisfies h2 < 0.5h1. This enables the coupling strength to be improved while facilitating the installation work.

[0039] Let L1 be the length of the male threaded portion 24 in the direction of the first central axis C21, L1a be the length of the first male threaded portion 241 in the direction of the first central axis C21, and L1b be the length of the second male threaded portion 242 in the direction of the first central axis C21. The male threaded portion 24 satisfies 0.5L1 ≤ L1a ≤ 0.9L1. The male threaded portion 24 satisfies L1b = L1 - L1a. This allows for improved joint strength while facilitating installation.

[0040] As shown in Figures 2 and 4, the funnel portion 3 is located at the upstream end 2a of the drain pipe portion 2. More specifically, the funnel portion 3 is positioned opposite the upstream end 2a of the drain pipe portion 2, such that the central axis C3 of the funnel portion 3 coincides with the central axis C2 of the drain pipe portion 2.

[0041] As shown in Figures 2 and 8, the funnel section 3 has a first opening 3a and a second opening 3b. The funnel section 3 directs the fluid flowing in from the first opening 3a to the outlet 2c of the drain pipe section 2 through the second opening 3b.

[0042] The funnel portion 3 has a reduced diameter portion 31, a small diameter cylindrical portion 32, and a flange 33.

[0043] As shown in Figure 8, the reduced diameter portion 31 is cylindrical in shape, with its outer and inner diameters decreasing as it approaches the drain pipe portion 2. The reduced diameter portion 31 can also be described as a hollow frustoconical shape with open ends. The reduced diameter portion 31 has a first surface 311 and a second surface 312. The first surface 311 is the inner circumferential surface of the reduced diameter portion 31. The first surface 311 defines the surface of the reduced diameter portion 31 opposite to the drain pipe portion 2. The second surface 312 is the outer circumferential surface of the reduced diameter portion 31. The second surface 312 defines the surface of the reduced diameter portion 31 facing the drain pipe portion 2. In this embodiment, the maximum outer diameter of the reduced diameter portion 31 is smaller than the inner diameter of the drain pipe portion 2 (the inner diameter of the first cylindrical portion 21). In this embodiment, the inclination angle of the first surface 311 of the reduced diameter portion 31 in a cross-section passing through the central axis of the reduced diameter portion 31 is 40 degrees or more and 60 degrees or less.

[0044] The small-diameter cylindrical portion 32 extends from the end of the reduced-diameter portion 31 on the drain pipe portion 2 side (the lower end in Figure 2) towards the drain pipe portion 2. The small-diameter cylindrical portion 32 is cylindrical with less change in inner and outer diameter than the reduced-diameter portion 31. The interior of the small-diameter cylindrical portion 32 is connected to the interior of the reduced-diameter portion 31. The outer and inner circumferential surfaces of the small-diameter cylindrical portion 32 are substantially perpendicular to the central axis C2 of the drain pipe portion 2, and are neither the surface on the drain pipe portion 2 side nor the surface on the opposite side of the drain pipe portion 2.

[0045] The flange 33 extends radially outward from the end of the reduced-diameter portion 31 opposite to the drain pipe portion 2 (the upper end in Figure 8). The flange 33 is plate-shaped and has a first surface 331 and a second surface 332. The first surface 331 is the upper surface of the flange 33. The first surface 331 defines the surface of the flange 33 opposite to the drain pipe portion 2. The second surface 332 is the lower surface of the flange 33. The second surface 332 defines the surface of the flange 33 facing the drain pipe portion 2. The flange 33 is annular. In this embodiment, the outer diameter of the flange 33 is smaller than the inner diameter of the drain pipe portion 2 (the inner diameter of the first pipe portion 21).

[0046] As can be seen from Figures 5 and 6, in the funnel portion 3, the opening at the end of the reduced diameter portion 31 opposite to the drain pipe portion 2 is the first opening 3a, and the opening at the end of the small diameter portion 32 on the drain pipe portion 2 side is the second opening 3b.

[0047] As can be seen from Figures 2 and 8, in this embodiment, the funnel portion 3 is not located inside the drain pipe portion 2. Here, in the direction of the central axis C2 of the drain pipe portion 2, the distance between the second opening 3b and the drain pipe portion 2 is preferably less than half the distance between the first opening 3a and the drain pipe portion 2. In this embodiment, the end of the small-diameter cylindrical portion 32 of the funnel portion 3 on the drain pipe portion 2 side (second opening 3b) and the upstream end 2a of the drain pipe portion 2 are on the same plane. In other words, the minimum distance between the funnel portion 3 and the drain pipe portion 2, i.e., the distance between the second opening 3b and the drain pipe portion 2, is 0.

[0048] As can be seen from Figures 5 and 6, the central axis C3 of the funnel portion 3 coincides with the central axis of the reduced diameter portion 31, the central axis of the small diameter cylindrical portion 32, and the central axis of the flange 33.

[0049] In the funnel portion 3, the first surface 311 of the reduced diameter portion 31 and the first surface 331 of the flange 33 constitute the surface of the funnel portion 3 opposite to the drain pipe portion 2. In the funnel portion 3, the second surface 312 of the reduced diameter portion 31 and the second surface 332 of the flange 33 constitute the surface of the funnel portion 3 facing the drain pipe portion 2. Furthermore, the outer circumference 33a of the flange 33 constitutes the outer circumference of the funnel portion 3 when viewed from the direction of the central axis C2 of the drain pipe portion 2.

[0050] Let d be the diameter representing the outer shape of the funnel portion 3 as viewed from the direction of the central axis C2 of the drain pipe portion 2. Preferably, d is set to satisfy 0.6D ≤ d ≤ 1.5D. In this embodiment, d ≤ 1.0D. Here, the diameter d may be the diameter of the largest circle that tangent to any two points of the funnel portion 3 as viewed from the direction of the central axis C2 of the drain pipe portion 2. In this embodiment, since the funnel portion 3 is circular as viewed from the direction of the central axis C2 of the drain pipe portion 2, the diameter d is equal to the diameter of the funnel portion 3 (especially the diameter of the flange 33) as viewed from the direction of the central axis C2 of the drain pipe portion 2.

[0051] As shown in Figures 4 to 6, in this embodiment, there are five blades 4. The five blades 4 are the same shape. As shown in Figure 5, when viewed from the direction of the central axis C2 of the drain pipe 2, the five blades 4 are arranged at equal intervals around the central axis C2 of the drain pipe 2.

[0052] The blades 4 connect the drain pipe section 2 and the funnel section 3. More specifically, the blades 4 connect the upstream end 2a of the drain pipe section 2 to the side of the funnel section 3 opposite to the drain pipe section 2. In other words, the funnel section 3 is positioned at the upstream end 2a of the drain pipe section 2 so as to be suspended from the blades 4.

[0053] The wing 4 comprises a main body 41, an arm 42, and a reinforcing part 43.

[0054] The main body portion 41 is plate-shaped. In particular, the main body portion 41 is rectangular plate-shaped. The main body portion 41 protrudes from the upstream end 2a of the drain pipe portion 2. In particular, the main body portion 41 protrudes from the upstream end 2a of the drain pipe portion 2 along the central axis C2 of the drain pipe portion 2. The direction of the central axis C2 of the drain pipe portion 2 corresponds to the height direction of the main body portion 41. The main body portion 41 extends in the radial direction of the drain pipe portion 2 when viewed from the direction of the central axis C2 of the drain pipe portion 2. The radial direction of the drain pipe portion 2 corresponds to the length direction of the main body portion 41. The width direction (thickness direction) of the main body portion 41 is perpendicular to the radial direction of the drain pipe portion 2 when viewed from the direction of the central axis C2 of the drain pipe portion 2. The width of the main body portion 41 defines the width of the blade 4. If the width of the blade 4 is t, it is preferable that the drain 1 satisfies 2 mm ≤ t ≤ 6 mm.

[0055] The main body portion 41 has a first end portion 41a, a second end portion 41b, a third end portion 41c, and a fourth end portion 41d.

[0056] The first end 41a and the second end 41b are the ends of the main body 41 in the longitudinal direction. In particular, the first end 41a is the end of the drain pipe 2 on the side of the central axis C2 when viewed from the direction of the central axis C2 of the drain pipe 2. The second end 41b is the end of the drain pipe 2 on the opposite side of the central axis C2 when viewed from the direction of the central axis C2 of the drain pipe 2.

[0057] As can be seen from Figures 2 and 6, the corner of the first end 41a of the main body 41 is fillet-shaped when viewed from the direction of the central axis C2 of the drain pipe 2. In particular, the corner of the first end 41a of the main body 41 is a convex fillet shape. This makes it less likely for the worker's hand to hurt when touching the corner of the first end 41a when holding the blade 4 during the installation of the drain 1. Therefore, it is easier for the worker to hold the blade 4 during the installation of the drain 1. Note that the corner of the first end 41a of the main body 41 may be tapered when viewed from the direction of the central axis C2 of the drain pipe 2.

[0058] In the blade 4, as shown in Figures 2 and 6, the distance between the first end 41a of the main body 41 and the central axis C2 of the drain pipe 2, as viewed from the direction of the central axis C2 of the drain pipe 2, is denoted as b. It is preferable that b is set to satisfy 0.40d ≤ b ≤ 0.75d. When b is 0.40d or greater, the space between the drain pipe 2, the funnel 3, and the blade 4 can be widened while obtaining the flow straightening effect of the blade 4, thereby further suppressing the deterioration of drainage function caused by foreign matter. On the other hand, if b becomes too large, the entire drain 1 will become larger, so it is preferable that b be 0.75d or less.

[0059] In particular, in this embodiment, when viewed from the direction of the central axis C2 of the drain pipe section 2, the first end portion 41a of the main body section 41 is located outside the reduced diameter section 31. This allows for a further widening of the space between the drain pipe section 2, the funnel section 3, and the blades 4. Therefore, it is possible to further suppress the deterioration of drainage function caused by foreign matter. In addition, a swirling flow is more likely to occur between the reduced diameter section 31 and the blades 4, and an improvement in drainage function can be expected.

[0060] In particular, in this embodiment, when viewed from the direction of the central axis C2 of the drain pipe section 2, the first end portion 41a of the main body section 41 is located outside the flange 33. This configuration allows for a further widening of the space between the drain pipe section 2, the funnel section 3, and the vane 4. Therefore, it is possible to further suppress the deterioration of drainage function caused by foreign matter.

[0061] On the other hand, when viewed from the direction of the central axis C2 of the drain pipe section 2, the first end portion 41a of the main body section 41 is located inside the outlet 2c of the drain pipe section 2. This allows for an improvement in the flow straightening effect of the blades 4.

[0062] As shown in Figures 2 and 8, the first end portion 41a of the main body portion 41 is inclined so as it approaches the drain pipe portion 2 along the central axis C2 of the drain pipe portion 2, it moves away from the central axis C2 of the drain pipe portion 2. This widens the space between the drain pipe portion 2, the funnel portion 3, and the blades 4. This makes it possible to further suppress the deterioration of drainage function caused by foreign matter. In particular, in this embodiment, the first end portion 41a includes first and second inclined portions 41a1 and 41a2 that are inclined so as they approach the drain pipe portion 2 along the central axis C2 of the drain pipe portion 2, they move away from the central axis C2 of the drain pipe portion 2. The first inclined portion 41a1 is the upstream portion of the first end portion 41a, and the second inclined portion 41a2 is the downstream portion of the first end portion 41a. Therefore, the second inclined portion 41a2 is located between the first inclined portion 41a1 and the drain pipe portion 2. In this embodiment, the first and second inclined portions 41a1 and 41a2 have different inclination angles with respect to the central axis C2 of the drain pipe portion 2. In particular, the second inclined portion 41a2 has a larger inclination angle with respect to the central axis C2 of the drain pipe portion 2 than the first inclined portion 41a1. This makes it possible to shorten the length of the first end portion 41a in the direction of the central axis C2 of the drain pipe portion 2 while ensuring that there are no steep angles within the drain opening 2c. This improves the drainage function of the first end portion 41a of the blade 4.

[0063] As can be seen from Figures 4 and 5, when viewed from the direction of the central axis C2 of the drain pipe section 2, the corners (both corners in this embodiment) of the second end 41b of the main body section 41 are fillet-shaped. In particular, the corners of the second end 41b of the main body section 41 are convex fillet-shaped. This makes it less likely for a worker's hand to hurt when touching the corners of the second end 41b when holding the blades 4 during the installation of the drain 1. Therefore, it becomes easier for a worker to hold the blades 4 during the installation of the drain 1. Note that when viewed from the direction of the central axis C2 of the drain pipe section 2, the corners of the second end 41b of the main body section 41 may be tapered.

[0064] The third end 41c and the fourth end 41d are the ends of the main body 41 in the height direction. In particular, the third end 41c is the end opposite to the drain pipe 2 in the direction of the central axis C2 of the drain pipe 2. The fourth end 41d is the end on the drain pipe 2 side in the direction of the central axis C2 of the drain pipe 2.

[0065] The third end portion 41c is further from the drain pipe portion 2 than the first surface 331 of the flange 33 of the funnel portion 3, in the direction of the central axis C2 of the drain pipe portion 2. In the direction of the central axis C2 of the drain pipe portion 2, the distance between the end portion (third end portion 41c) of one or more blades 4 opposite to the drain pipe portion 2 and the surface of the funnel portion 3 opposite to the drain pipe portion 2 (first surface 331 of the flange 33) is 5 mm or more and 15 mm or less. That is, as shown in Figure 7, if a1 is the distance between the end portion (third end portion 41c) of one or more blades 4 opposite to the drain pipe portion 2 in the direction of the central axis C2 of the drain pipe portion 2 and the drain pipe portion 2, and a2 is the distance between the surface of the funnel portion 3 opposite to the drain pipe portion 2 (first surface 331) in the direction of the central axis C2 of the drain pipe portion 2 and the drain pipe portion 2, then the condition 5 mm ≤ a1 - a2 ≤ 15 mm is satisfied. Here, if we let a1-a2=a, then a represents the distance between the end of the blade 4 opposite to the drain pipe section 2 (third end 41c) and the surface of the funnel section 3 opposite to the drain pipe section 2 (first surface 331) in the direction of the central axis C2 of the drain pipe section 2. This makes it possible to improve the strength of the connection between the funnel section 3 and the blade 4. Here, it is more preferable that a(=a1-a2)=9mm.

[0066] The fourth end portion 41d is also the portion of the main body 41 that is connected to the drain pipe portion 2.

[0067] In the direction of the central axis C2 of the drain pipe section 2, the main body 41 is connected to the first flange 22 and the first connecting portion 23 of the drain pipe section 2, but not to the first cylindrical portion 21. That is, when viewed from the direction of the central axis C2 of the drain pipe section 2, the main body 41 does not protrude into the outlet 2c of the drain pipe section 2. This allows for a wider space between the drain pipe section 2, the funnel section 3, and the blades 4. This further suppresses the deterioration of drainage function caused by foreign matter. Furthermore, since the main body 41 extends not only to the first flange 22 of the drain pipe section 2 but also to the first connecting portion 23, the strength of the blades 4 can be maintained.

[0068] In this embodiment, as shown in Figures 5 and 7, the main body portion 41 has fillets 41e, 41e at the end (fourth end portion 41d) on the drain pipe portion 2 side, which increase the width of the main body portion 41 as it approaches the drain pipe portion 2 in the direction of the central axis C2 of the drain pipe portion 2. In this embodiment, the fillets 41e, 41e are located on both sides in the width direction of the main body portion 41. The surface of the fillets 41e is concave. The fillets 41e enable improved strength of the vanes 4 against the drain pipe portion 2. In this embodiment, as shown in Figures 5 and 8, the fillets 41e extend along the main body portion 41 and, like the main body portion 41, extend not only to the first flange 22 of the drain pipe portion 2 but also to the first connection portion 23. The fillets 41e include a first portion 41e1 located on the first flange 22 and a second portion 41e2 located on the first connection portion 23. In particular, in the second portion 41e2, at least one of the radius of curvature or width of the fillet 41e decreases from the second end 41b to the first end 41a of the main body 41. This allows for improved drainage function by the fillet 41e. In the second portion 41e2, the radius of curvature or width of the fillet 41e may be reduced to 0.

[0069] The arm portion 42 connects the funnel portion 3 to the main body portion 41 on the side opposite to the drain pipe portion 2 (first surface 311, 331). The arm portion 42 protrudes toward the funnel portion 3 from the end of the main body portion 41 opposite to the drain pipe portion 2 (third end portion 41c). When viewed from the direction of the central axis C2 of the drain pipe portion 2, the arm portion 42 extends in the radial direction of the drain pipe portion 2. The width direction of the arm portion 42 is perpendicular to the radial direction of the drain pipe portion 2 when viewed from the direction of the central axis C2 of the drain pipe portion 2. As an example, the width of the arm portion 42 is preferably 2 mm or more and 6 mm or less.

[0070] As shown in Figures 2, 4, and 5, the arm portion 42 extends from the main body portion 41 to the first surface 331 of the flange 33 and the first surface 311 of the reduced diameter portion 31 of the funnel portion 3. The arm portion 42 connects the flange 33 and the reduced diameter portion 31 to the main body portion 41. In other words, the arm portion 42 has a first portion 42a and a second portion 42b. The first portion 42a is the part of the arm portion 42 that is connected to the flange 33. The second portion 42b is the part of the arm portion 42 that is connected to the reduced diameter portion 31. The height of the first portion 42a relative to the drain pipe portion 2 does not change as it approaches the center of the reduced diameter portion 31. The height of the second portion 42b relative to the drain pipe portion 2 decreases as it approaches the center of the reduced diameter portion 31. The height of the first part 42a or the second part 42b relative to the drain pipe section 2 is the distance between the end of the first part 42a or the second part 42b opposite to the drain pipe section 2 in the direction of the central axis C2 of the drain pipe section 2 and the drain pipe section 2. This makes it possible to increase the inflow of rainwater into the funnel section 3. Furthermore, even when rainwater flows into the funnel section 3, the possibility of vortex formation in the drain pipe section 2 can be reduced.

[0071] As shown in Figures 2, 4, and 5, let c be the length of the connection between the arm portion 42 and the funnel portion 3 as viewed from the direction of the central axis C2 of the drain pipe portion 2. In this embodiment, c is equal to the distance between the tip of the arm portion 42 and the outer circumference of the funnel portion 3 (outer circumference 33a of the flange 33) as viewed from the direction of the central axis C2 of the drain pipe portion 2. It is preferable that c is set to satisfy 0.1d ≤ c ≤ 0.5D. When c is 0.1d or greater, it is possible to improve the strength of the connection between the funnel portion 3 and the blade 4. When c is 0.5D or less, it is possible to form a first opening 3a and a second opening 3b of sufficient size in the funnel portion 3. As shown in Figures 2, 4, and 5, let e be the distance between the tip of the arm portion 42 and the central axis C2 of the drain pipe portion 2 as viewed from the direction of the central axis C2 of the drain pipe portion 2. It is preferable that e ≤ 0.25d. This is possible to improve the strength of the connection between the funnel portion 3 and the blade 4.

[0072] In this embodiment, as shown in Figures 5 and 8, the width of the arm portion 42 increases as it approaches the central axis C2 of the drain pipe portion 2, when viewed from the direction of the central axis C2 of the drain pipe portion 2. In particular, at the tip portion of the second portion 42b of the arm portion 42, the width of the arm portion 42 increases as it approaches the central axis C2 of the drain pipe portion 2, when viewed from the direction of the central axis C2 of the drain pipe portion 2. This makes it possible to improve the strength of the connection between the funnel portion 3 and the blades 4. The minimum width of the arm portion 42 is equal to the width of the main body portion 41.

[0073] In this embodiment, as shown in Figures 5, 8, and 9, the arm portion 42 has fillets 42c, 42c at the end (lower end) on the drain pipe portion 2 side, such that the width of the arm portion 42 increases as it approaches the drain pipe portion 2 in the direction of the central axis C2 of the drain pipe portion 2. In this embodiment, the fillets 42c, 42c are located on both sides in the width direction of the arm portion 42. The surface of the fillets 42c is concave. The fillets 42c enable improved strength of the connection between the funnel portion 3 and the blades 4. In this embodiment, as shown in Figures 5 and 8, the fillets 42c extend along the arm portion 42 and, like the arm portion 42, extend not only to the flange 33 of the funnel portion 3 but also to the reduced diameter portion 31. In particular, at the tip of the fillets 42c, at least one of the radius of curvature or the width of the fillets 42c decreases as it approaches the central axis C2 of the funnel portion 3. This enables improved drainage function by the fillets 42c. At the tip of the fillet 42c, the radius of curvature or width of the fillet 42c may be reduced to 0.

[0074] The reinforcing portion 43 is provided to improve the strength of the blade 4. As shown in FIG. 5, the reinforcing portion 43 is located at a position overlapping the outer peripheral portion of the funnel portion 3 (the outer peripheral portion 33a of the flange 33) when viewed from the direction of the central axis C2 of the drain cylinder portion 2. The width direction of the reinforcing portion 43 is orthogonal to the radial direction of the drain cylinder portion 2 when viewed from the direction of the central axis C2 of the drain cylinder portion 2. As particularly understood from FIG. 9, the width of the reinforcing portion 43 increases as it approaches the funnel portion 3 (flange 33) in the direction of the central axis C2 of the drain cylinder portion 2. When a force is applied to the funnel portion 3 or the blade 4, stress tends to concentrate on the portion of the blade 4 corresponding to the outer peripheral portion of the funnel portion 3. Therefore, the presence of the reinforcing portion 43 can reduce the possibility of damage to the blade 4 due to such stress. Let the maximum value of the width of the reinforcing portion 43 be t1. It is preferable that t1 is set to satisfy 1.1t < t1 < 1.4t.

[0075] In the present embodiment, referring to FIGS. 2 and 4, in the direction of the central axis C2 of the drain cylinder portion 2, the surface 43a of the reinforcing portion 43 on the side of the drain cylinder portion 2 is farther from the drain cylinder portion 2 than the surface on the side of the drain cylinder portion 2 of the outer peripheral portion of the funnel portion 3 (the second surface 332 of the flange 33). In FIG. 2, the position of the surface 43a of the reinforcing portion 43 on the side of the drain cylinder portion 2 is indicated by h1, and the position of the surface on the side of the drain cylinder portion 2 of the outer peripheral portion of the funnel portion 3 (the second surface 332 of the flange 33) is indicated by h2. Thereby, when a force is applied to the funnel portion 3 or the blade 4, the reinforcing portion 43 can easily absorb stress, and the possibility of damage to the blade 4 can be reduced.

[0076] In the present embodiment, the reinforcing portion 43 is located between the main body portion 41 and the arm portion 42 when viewed from the direction of the central axis C2 of the drain cylinder portion 2. When a force is applied to the funnel portion 3 or the blade 4, stress tends to concentrate on the connection portion between the main body portion 41 and the arm portion 42 of the blade 4. Therefore, the presence of the reinforcing portion 43 can reduce the possibility of damage to the blade 4 due to such stress.

[0077] In this embodiment, the reinforcing portion 43 is positioned to overlap with the outer circumference of the funnel portion 3 (the outer circumference 33a of the flange 33) when viewed from the direction of the central axis C2 of the drain pipe portion 2. Furthermore, in the direction of the central axis C2 of the drain pipe portion 2, the surface 43a of the reinforcing portion 43 on the drain pipe portion 2 side is further away from the drain pipe portion 2 than the surface on the outer circumference of the funnel portion 3 on the drain pipe portion 2 side (the second surface 332 of the flange 33). As a result, as shown in Figure 2, there is a gap G between the main body portion 41 and the end of the outer circumference of the funnel portion 3 on the drain pipe portion 2 side. Due to this gap G, the blades 4 do not come into contact with the radially outer end of the drain pipe portion 2 on the second surface 332 of the flange 33. Due to this gap G, the main body portion 41 of the blades 4 and the flange 33 of the funnel portion 3 are spaced apart from each other in the radial direction of the drain pipe portion 2. Therefore, the space between the drain pipe section 2, the funnel section 3, and the blades 4 can be widened, making it possible to further suppress the deterioration of drainage function caused by foreign matter. In particular, the presence of the gap G makes it easier for swirling flow to occur between the reduced diameter section 31 and the blades 4, and an improvement in drainage function can be expected.

[0078] In this embodiment, as shown in Figure 2, the blades 4 do not come into contact with the surface of the funnel portion 3 on the drain pipe portion 2 side (second surfaces 312, 332). Therefore, the space between the funnel portion 3 and the drain pipe portion 2 can be widened, reducing the possibility of foreign objects getting stuck. Thus, the drain 1 enables improved flow straightening and suppression of the deterioration of drainage function caused by foreign objects. In particular, in this embodiment, the blades 4 are not located between the funnel portion 3 and the drain pipe portion 2. Therefore, the space between the funnel portion 3 and the drain pipe portion 2 can be widened even further, further reducing the possibility of foreign objects getting stuck. Thus, the drain 1 enables further suppression of the deterioration of drainage function caused by foreign objects.

[0079] Refer to Figure 2 again. The second member 6 is used to connect the drain 1 to the piping member. The piping member may be, for example, a straight pipe, an elbow, or a socket. In this embodiment, the second member 6 is connected to the vertical pipe 11 via the socket 12.

[0080] Figure 10 is a perspective view of the second member 6 of the drain 1. The second member 6 has a second cylindrical portion 61 and a second flange 62. The second cylindrical portion 61 houses the first cylindrical portion 21 inside. The second cylindrical portion 61 has an upstream end 61a and a downstream end 61b. The second cylindrical portion 61 is cylindrical in shape, with no change in inner or outer diameter. The inner diameter of the second cylindrical portion 61 is larger than the outer diameter of the drain pipe portion 2 of the drain 1 (the outer diameter of the first cylindrical portion 21). The second flange 62 extends outward from the upstream end 61a of the second cylindrical portion 61. More specifically, the second flange 62 is located at the upstream end 61a of the second cylindrical portion 61 (the upstream end in Figure 2) and extends radially outward from the second cylindrical portion 61. In this embodiment, there is a second connecting portion 63 between the upstream end 61a of the second cylindrical portion 61 and the second flange 62. The second connecting portion 63 is cylindrical in shape, with its inner diameter gradually increasing from the second cylindrical portion 61 towards the second flange 62.

[0081] As can be seen from Figure 10, the central axis C6 of the second member 6 coincides with the central axis (second central axis) C61 of the second cylindrical portion 61 and the central axis C62 of the second flange 62.

[0082] The second member 6 further includes a female threaded portion 64. The female threaded portion 64 is located on the inner circumferential surface of the second cylindrical portion 61. The female threaded portion 64 is used to connect the first member 5 and the second member 6. The female threaded portion 64 is connected to the male threaded portion 24.

[0083] As shown in Figure 3, the second cylindrical portion 61 has an overlapping region 640 that overlaps with the male threaded portion 24. The female threaded portion 64 is located in at least a part of the overlapping region 640. The female threaded portion 64 includes a first female threaded portion 641 and a second female threaded portion 642. The first female threaded portion 641 is coupled to the first male threaded portion 241, and the second female threaded portion 642 is coupled to the second male threaded portion 242. The second female threaded portion 642 is located between the first female threaded portion 641 and the downstream end 61b of the second cylindrical portion 61. The first female threaded portion 641 is the portion of the female threaded portion 64 on the upstream end 61a side of the second cylindrical portion 61. The second female threaded portion 642 is the portion of the female threaded portion 64 on the downstream end 61b side of the second cylindrical portion 61. Here, the overlapping region 640 includes a first region 640a and a second region 640b. The first female thread portion 641 is located in at least a portion of the first region 640a. In this embodiment, as shown in Figure 10, the first female thread portion 641 is not continuous around the second central axis C61 of the second cylindrical portion 61, but is intermittently located in the first region 640a. Similarly, the second female thread portion 642 is not continuous around the second central axis C61 of the second cylindrical portion 61, but is intermittently located in the second region 640b. This allows for a reduction in friction between the male thread portion 24 and the female thread portion 64, and facilitates the installation work between the first member 5 and the second member 6.

[0084] As shown in Figure 3, the first female threaded portion 641 is defined by thread 641a, and the second female threaded portion 642 is defined by thread 642a. In this embodiment, the pitch of thread 641a of the first female threaded portion 641 is equal to the pitch of thread 642a of the second female threaded portion 642. The height of thread 642a of the second female threaded portion 642 is lower than the height of thread 641a of the first female threaded portion 641. As described above, the lower the height of the threads of the threaded portion, the easier the installation work becomes, but the joint strength decreases. In other words, the second female threaded portion 642 contributes more to improving the joint strength between the first member 5 and the second member 6 than the first female threaded portion 641, and the first female threaded portion 641 contributes more to facilitating the installation work between the first member 5 and the second member 6 than the second female threaded portion 642.

[0085] The threads 641a of the first female thread portion 641 and the threads 642a of the second female thread portion 642 are not continuous. This means that the first female thread portion 641 and the second female thread portion 642 are independent of each other. As a result, the female thread portion 64 has a flat portion 643 between the first female thread portion 641 and the second female thread portion 642 in the direction of the second central axis C61, where there are no threads 641a and 642a. The flat portion 643 is the position where the height of the threads 641a and 642a is zero, and there is no flat portion (step portion, protrusion) between the first female thread portion 641 and the second female thread portion 642 that faces downward due to the diameter expanding outward from the upward side. This makes it possible to reduce friction between the male thread portion 24 and the female thread portion 64, and makes it possible to facilitate the installation work between the first member 5 and the second member 6.

[0086] The height of the threads 642a of the second female threaded portion 642 increases as it approaches the downstream end 61b of the second cylindrical portion 61. This allows for improved bonding strength between the first member 5 and the second member 6.

[0087] The female threaded portion 64 is configured to satisfy the following dimensions: The height of the thread 641a of the first female threaded portion 641 is h3, and the height of the thread 642a of the second female threaded portion 642 is h4. The female threaded portion 64 satisfies h4 > h3, and preferably h4 > 2h3. This allows for improved joint strength while facilitating installation.

[0088] Let L2 be the length of the overlapping region 640 in the direction of the second central axis C61 of the second cylindrical portion 61, L2a be the length of the first region 640a in the direction of the second central axis C61, L2b be the length of the second region 640b in the direction of the second central axis C61, and L2c be the length of the planar portion 643 in the direction of the second central axis C61. The female threaded portion 64 satisfies 0.5L2 ≤ L2a ≤ 0.9L2. The female threaded portion 64 satisfies L2b = L2 - L2a. The female threaded portion 64 satisfies L2c < 0.3L2b. This makes it possible to improve the joint strength while making the installation work easier. Note that in the drain 1, L1 = L2, L1a = L2a, and L1b = L2b.

[0089] In the gutter drainage structure 100, the drain 1 is fixed to the gutter 10. As shown in Figure 2, the first member 5 of the drain 1 is positioned at the inlet 10b of the gutter 10. Here, the first cylindrical portion 21 of the drain pipe 2 is located below the inlet 10b of the bottom wall 10a of the gutter 10, and the first flange 22 of the drain pipe 2 is in contact with the upper surface around the inlet 10b of the bottom wall 10a of the gutter 10 on its downstream side. The second member 6 of the drain 1 is attached to the first cylindrical portion 21 of the drain pipe 2 below the inlet 10b.

[0090] Specifically, the downstream end 21b of the first cylindrical portion 21 of the drain pipe portion 2 of the first member 5 is inserted into the second cylindrical portion 61 of the second member 6 from the upstream end 61a of the second cylindrical portion 61. As a result, the downstream end 21b of the first cylindrical portion 21 approaches the female thread portion 64 of the second cylindrical portion 61 from above. At this time, in the male thread portion 24, the second male thread portion 242 is at a downstream end 21b than the first male thread portion 241, but the height h2 of the threads 242a of the second male thread portion 242 is lower than the height h1 of the threads 241a of the first male thread portion 241. Therefore, compared to the case where the height of the threads of the male thread portion 24 is h1 throughout, the male thread portion 24 is less likely to catch on the inner surface of the second connecting portion 63 or the second cylindrical portion 61. In addition, the male thread portion 24 becomes easier to fit into the female thread portion 64. This reduces the possibility that the male thread portion 24 and the female thread portion 64 will collide during the installation of the first member 5 and the second member 6, causing the first member 5 to tilt relative to the second member 6, thus reducing the possibility of having to redo the installation of the first member 5 and the second member 6, which is a very time-consuming process. On the other hand, in the female thread portion 64 of the second member 6, although the first female thread portion 641 is located at the upstream end 61a rather than the second female thread portion 642, the height h3 of the thread 641a of the first female thread portion 641 is lower than the height h4 of the thread 642a of the second female thread portion 642. Therefore, compared to the case where the height of the threads of the female thread portion 64 is h4 throughout, the male thread portion 24 is more likely to engage with the female thread portion 64. This also reduces the possibility that the male threaded portion 24 and the female threaded portion 64 may collide during the installation of the first member 5 and the second member 6, causing the first member 5 to tilt relative to the second member 6, thus reducing the possibility of having to redo the installation of the first member 5 and the second member 6, which is a very time-consuming process. After the male threaded portion 24 is fitted into the female threaded portion 64, the first member 5 is rotated relative to the second member 6. As a result, the second male threaded portion 242 is connected to the second female threaded portion 642, and the first male threaded portion 241 is connected to the first female threaded portion 641. This connects the male threaded portion 24 of the first cylindrical portion 21 and the female threaded portion 64 of the second cylindrical portion 61.

[0091] When the first member 5 and the second member 6 are joined together, the second flange 62 of the second member 6 rests against the lower surface around the inlet 10b of the bottom wall 10a of the gutter 10. In this way, the first flange 22 and the second flange 62 sandwich the periphery of the inlet 10b of the gutter 10 from both above and below, thereby attaching the drain 1 to the gutter 10.

[0092] When the second member 6 is attached to the first member 5, the first cylindrical portion 21 of the drain pipe portion 2 of the first member 5 is located within the second cylindrical portion 61 and the second connecting portion 63 of the second member 6. The positional relationship between the second member 6 and the first member 5 is affected by the thickness of the bottom wall 10a of the gutter 10, but the upstream end of the second cylindrical portion 61 of the second member 6 is located downstream of the upstream end 21a of the first cylindrical portion 21 of the drain pipe portion 2 in the direction of the central axis C2 of the drain pipe portion 2.

[0093] The vertical pipe 11 defines the vertical flow path. The vertical pipe 11 is fixed to the wall 220 of the building 200. In a rain gutter system, the vertical pipe 11 is also called a downpipe. The vertical pipe 11 is installed to drain rainwater from the inlet 10b. The vertical pipe 11 allows rainwater from the inlet 10b to flow vertically. The vertical pipe 11 is straight. The cross-section perpendicular to the central axis of the vertical pipe 11 is circular. The vertical pipe 11 is positioned so that the direction of its central axis coincides with the vertical direction. The vertical pipe 11 has an upstream end 11a and a downstream end 11b. The upstream end 11a is the end of the vertical pipe 11 that is connected to the inlet 10b (the upper end in Figure 1). The downstream end 11b is the end of the vertical pipe 11 that is inserted into the manhole 310 (the lower end in Figure 1). In Figure 1, a pipe cover 11c is positioned to prevent rainwater from flowing into the manhole 310 through the gap between the vertical pipe 11 and the manhole 310. The length of the vertical pipe 11 is preferably 3m or more.

[0094] The socket 12 connects the second member 6 and the vertical pipe 11. In this embodiment, the second cylindrical portion 61 of the second member 6 is connected to the upstream receiving end of the socket 12, and the upstream end 11a of the vertical pipe 11 is connected to the downstream receiving end of the socket 12.

[0095] As an example, the materials of the vertical pipe 11 and the socket 12 are rigid polyvinyl chloride. The dimensions of the vertical pipe 11, for example, the outer shape and thickness, may be set in accordance with the standards of the rigid polyvinyl chloride pipe (general) in JIS K 6741 "Rigid Polyvinyl Chloride Pipes". The dimensions of the socket 12, for example, the outer shape and thickness, may be set in accordance with the standards of the socket in JIS K 6739 "Rigid Polyvinyl Chloride Pipe Fittings for Drainage".

[0096] [1.2 Effects, etc.] The drain 1 described above includes a first member 5 including a drain tube portion 2 having a first cylindrical portion 21 disposed at the inlet 10b of the eaves gutter 10, a first flange 22 extending outward from the upstream end portion 21a of the first cylindrical portion 21, and a male screw portion 24 on the outer peripheral surface of the first cylindrical portion 21; and a second member 6 including a second cylindrical portion 61 that houses the first cylindrical portion 21 inside, a second flange 62 that extends outward from the upstream end portion 61a of the second cylindrical portion 61 and sandwiches the peripheral edge portion of the inlet 10b in the eaves gutter 10 between the second flange 62 and the first flange 22, and a female screw portion 64 that is on the inner peripheral surface of the second cylindrical portion 61 and is coupled to the male screw portion 24. The male screw portion 24 exists in the direction of the first central axis C21 of the first cylindrical portion 21 from the downstream end portion 21b of the first cylindrical portion 21 toward the upstream end portion 21a of the first cylindrical portion 21. The male screw portion 24 includes a first male screw portion 241 and a second male screw portion 242 between the first male screw portion 241 and the downstream end portion 21b of the first cylindrical portion 21. When the height of the thread crest 241a of the first male screw portion 241 is h1 and the height of the thread crest 242a of the second male screw portion 242 is h2, h2 < h1 is satisfied. This configuration enables easier installation work and improved coupling strength.

[0097] In the drain 1, the thread crest 241a of the first male screw portion 241 and the thread crest 242a of the second male screw portion 242 are continuous. This configuration enables easier installation work.

[0098] In the drain 1, the pitch of the thread crest 241a of the first male screw portion 241 and the pitch of the thread crest 242a of the second male screw portion 242 are equal. This configuration enables easier installation work and improved coupling strength.

[0099] In the drain 1, if the length of the male threaded portion 24 in the direction of the first central axis C21 is L1, the length of the first male threaded portion 241 in the direction of the first central axis C21 is L1a, and the length of the second male threaded portion 242 in the direction of the first central axis C21 is L1b, then the following conditions are met: 0.5L1 ≤ L1a ≤ 0.9L1 and L1b = L1 - L1a. This configuration facilitates installation and improves joint strength.

[0100] In drain 1, the condition h2 < 0.5h1 is satisfied. This configuration facilitates installation.

[0101] In the drain 1, the height h2 of the threads 242a of the second male threaded portion 242 decreases as it approaches the downstream end 21b of the first cylindrical portion 21. This configuration facilitates installation.

[0102] The drain 1 described above comprises a first member 5 including a drain pipe 2 having a first cylindrical portion 21 positioned at the inlet 10b of the gutter 10, a first flange 22 extending outward from the upstream end 21a of the first cylindrical portion 21, and a male threaded portion 24 on the outer circumferential surface of the first cylindrical portion 21; and a second member 6 having a second cylindrical portion 61 that houses the first cylindrical portion 21 inside, a second flange 62 extending outward from the upstream end 61a of the second cylindrical portion 61 and sandwiching the peripheral edge of the inlet 10b in the gutter 10 between itself and the first flange 22; and a female threaded portion 64 on the inner circumferential surface of the second cylindrical portion 61 that is connected to the male threaded portion 24. The male threaded portion 24 is located in the direction of the first central axis C21 of the first cylindrical portion 21, from the downstream end 21b of the first cylindrical portion 21 toward the upstream end 21a of the first cylindrical portion 21. The female thread portion 64 includes a first female thread portion 641 and a second female thread portion 642 between the first female thread portion 641 and the downstream end 61b of the second cylindrical portion 61. If the height of the threads 641a of the first female thread portion 641 is h3 and the height of the threads 642a of the second female thread portion 642 is h4, then h4 > h3 is satisfied. This configuration makes installation easier and improves the joint strength.

[0103] In the drain 1, the second cylindrical portion 61 has an overlapping region 640 that overlaps with the male threaded portion 24. The overlapping region 640 includes a first region 640a in which the first female threaded portion 641 is located in at least a part, and a second region 640b in which the second female threaded portion 642 is located in at least a part. If the length of the overlapping region 640 in the direction of the second central axis C61 of the second cylindrical portion 61 is L2, the length of the first region 640a in the direction of the second central axis C61 is L2a, and the length of the second region 640b in the direction of the second central axis C61 is L2b, then the following conditions are met: 0.5L2 ≤ L2a ≤ 0.9L2 and L2b = L2 - L2a. This configuration facilitates installation and improves joint strength.

[0104] In drain 1, the condition h4 > 2h3 is satisfied. This configuration facilitates installation.

[0105] In the drain 1, the height h4 of the threads 642a of the second female threaded portion 642 increases as it approaches the downstream end 61b of the second cylindrical portion 61. This configuration facilitates installation.

[0106] In the drain 1, the female threaded portion 64 has a flat portion 643 between the first female threaded portion 641 and the second female threaded portion 642 in the direction of the second central axis C61, where there are no threads 641a, 642a. This configuration facilitates installation.

[0107] In the drain 1, the second cylindrical portion 61 has an overlapping region 640 that overlaps with the male threaded portion 24. The overlapping region 640 includes a first region 640a in which the first female threaded portion 641 is located in at least a part, and a second region 640b in which the second female threaded portion 642 is located in at least a part. If the length of the overlapping region 640 in the direction of the second central axis C61 of the second cylindrical portion 61 is L2, the length of the first region 640a in the direction of the second central axis C61 is L2a, the length of the second region 640b in the direction of the second central axis C61 is L2b, and the length of the planar portion 643 in the direction of the second central axis C61 is L2c, then the following conditions are satisfied: 0.5L2 ≤ L2a ≤ 0.9L2, L2b = L2 - L2a, and L2c < 0.3L2b. This configuration facilitates installation and improves joint strength.

[0108] In drain 1, the pitch of the threads 641a of the first female threaded portion 641 is equal to the pitch of the threads 642a of the second female threaded portion 642. This configuration facilitates installation and improves joint strength.

[0109] The drain 1 described above comprises a first member 5 including a drain pipe 2 having a first cylindrical portion 21 positioned at the inlet 10b of the gutter 10, a first flange 22 extending outward from the upstream end of the first cylindrical portion 21, and a male threaded portion 24 on the outer circumferential surface of the first cylindrical portion 21; and a second member 6 having a second cylindrical portion 61 that houses the first cylindrical portion 21 inside, a second flange 62 extending outward from the upstream end of the second cylindrical portion 61 and sandwiching the peripheral edge of the inlet 10b in the gutter 10 between itself and the first flange 22; and a female threaded portion 64 on the inner circumferential surface of the second cylindrical portion 61 that is connected to the male threaded portion 24. The male threaded portion 24 is located in the direction of the first central axis C21 of the first cylindrical portion 21, from the downstream end 21b of the first cylindrical portion 21 toward the upstream end 21a of the first cylindrical portion 21. The male threaded portion 24 includes a first male threaded portion 241 and a second male threaded portion 242 located between the first male threaded portion 241 and the downstream end 21b of the first cylindrical portion 21. The female threaded portion 64 includes a first female threaded portion 641 connected to the first male threaded portion 241 and a second female threaded portion 642 located between the first female threaded portion 641 and the downstream end 61b of the second cylindrical portion 61 and connected to the second male threaded portion 242. If the height of the threads 241a,242a of the first male threaded portion 241 is h1, the height of the threads 241a,242a of the second male threaded portion 242 is h2, the height of the threads of the first female threaded portion 641 is h3, and the height of the threads of the second female threaded portion 642 is h4, then h2 This configuration satisfies h3. This configuration facilitates installation and improves joint strength.<h1>

[0110] In the drain 1, the first member 5 further comprises a funnel portion 3 located at the upstream end 2a of the drain pipe portion 2, which includes a reduced diameter portion 31 whose outer and inner diameters decrease as it approaches the drain pipe portion 2, and one or more blades 4 connecting the drain pipe portion 2 and the funnel portion 3. The one or more blades 4 include a plate-shaped main body portion 41 protruding from the upstream end 2a of the drain pipe portion 2, and an arm portion 42 connecting the surface of the funnel portion 3 opposite to the drain pipe portion 2 (first surface 331) to the main body portion 41. There is a gap G between the main body portion 41 and the surface of the outer circumference of the funnel portion 3 that faces the drain pipe portion 2. This configuration enables improved flow straightening and suppression of a decrease in drainage function caused by foreign matter.

[0111] [2. Variant] The embodiments of this disclosure are not limited to those described above. The embodiments can be modified in various ways depending on the design, etc., as long as the objectives of this disclosure can be achieved. The following lists some modifications of the embodiments. The modifications described below can be combined and applied as appropriate.

[0112] The gutter drainage structure to which the drain 1 described above can be applied is not limited to the gutter drainage structure 100 shown in Figure 1.

[0113] [2.1 Variation 1] Figure 11 is a schematic diagram of the gutter drainage structure 100A according to modified example 1. The gutter drainage structure 100A comprises a drain 1, a gutter 10, a vertical pipe 11, a horizontal pipe 13, a first elbow 14-1, and a second elbow 14-2.

[0114] In the eaves gutter drainage structure 100A, the vertical pipe 11 is connected to the drain 1 (particularly the second member 6) via the horizontal pipe 13, the first elbow 14-1, and the second elbow 14-2.

[0115] The horizontal pipe 13 defines a flow path that intersects the vertical direction. In a rain gutter system, the horizontal pipe 13 is also called a connecting pipe. The horizontal pipe 13 is the part that carries rainwater from the building 200 from the inlet 10b to the vertical pipe 11. The horizontal pipe 13 is located between the rainwater inlet 10b and the vertical pipe 11. The horizontal pipe 13 is straight. The cross section perpendicular to the central axis of the horizontal pipe 13 is circular. The horizontal pipe 13 is fixed so that the direction of the central axis of the horizontal pipe 13 is inclined with respect to the up and down direction (vertical direction). The horizontal pipe 13 has an upstream end 13a and a downstream end 13b. The upstream end 13a is the end of the horizontal pipe 13 that connects to the inlet 10b (the left end in Figure 11). The downstream end 13b is the end of the horizontal pipe 13 that connects to the vertical pipe 11 (the right end in Figure 11). For example, the material of the horizontal pipe 13 is rigid polyvinyl chloride. The dimensions of the horizontal pipe 13, for example, the outer diameter and thickness, may be set in accordance with the standard for rigid polyvinyl chloride pipes (general) in JIS K 6741 "Rigid Polyvinyl Chloride Pipes".

[0116] The first elbow 14-1 and the second elbow 14-2 change the direction of the flow path. The first elbow 14-1 and the second elbow 14-2 are connecting fittings that connect flow paths with different directions, such as a vertical pipe and a horizontal pipe.

[0117] Each of the first elbow 14-1 and the second elbow 14-2 has a curved section (bend) 14a and receiving openings 14b and 14c. The curved section 14a and the receiving openings 14b and 14c are formed as a continuous, integral part. As an example, the material of the first elbow 14-1 and the second elbow 14-2 is rigid polyvinyl chloride. The dimensions of the first elbow 14-1 and the second elbow 14-2 may be set in accordance with the JIS K 6739 standard "Rigid polyvinyl chloride pipe fittings for drainage".

[0118] Each of the first elbow 14-1 and the second elbow 14-2 is a 45° elbow (so-called 45L) as specified in JIS K 6739. In each of the first elbow 14-1 and the second elbow 14-2, the angle between the central axes of the sockets 14b and 14c is 45°.

[0119] In the eaves gutter drainage structure 100A, the second cylindrical portion 61 of the second member 6 is connected to the receiving port 14b of the first elbow 14-1, and the upstream end 13a of the horizontal pipe 13 is connected to the receiving port 14c of the first elbow 14-1. The downstream end 13b of the horizontal pipe 13 is connected to the receiving port 14b of the second elbow 14-2, and the upstream end 11a of the vertical pipe 11 is connected to the receiving port 14c of the second elbow 14-2. In this way, a flow path for rainwater from the eaves gutter 10 to the manhole 310 is formed.

[0120] [2.2 Variation 2] Figure 12 is a schematic diagram of the gutter drainage structure 100B according to the modified example 2. The gutter drainage structure 100B comprises a drain 1, a gutter 10, a vertical pipe 11, and an eccentric socket 15.

[0121] In the eaves gutter drainage structure 100B, the vertical pipe 11 is connected to the drain 1 (particularly the second member 6) via an eccentric socket 15.

[0122] The eccentric socket 15 has an eccentric portion 15a and receiving openings 15b and 15c. The eccentric portion 15a and the receiving openings 15b and 15c are formed as a continuous, integral part. As an example, the material of the eccentric socket 15 is rigid polyvinyl chloride. The eccentric socket 15 may be a so-called S-socket.

[0123] In the eaves gutter drainage structure 100B, the second cylindrical portion 61 of the second member 6 is connected to the receiving opening 15b of the eccentric socket 15, and the upstream end 11a of the vertical pipe 11 is connected to the receiving opening 15b of the eccentric socket 15. In this way, a flow path for rainwater from the eaves gutter 10 to the manhole 310 is formed.

[0124] [2.3 Variation 3] Figure 13 is a schematic diagram of the gutter drainage structure 100C according to the modified example 3. The gutter drainage structure 100C comprises a drain 1, gutters 10-1 and 10-2, vertical pipes 11-1 and 11-2, horizontal pipes 13-1 and 13-2, first to third elbows 14-1 to 14-3, a tee 16, a drain 17, and a piping member 18.

[0125] The gutter 10-1 receives rainwater from the roof 210 of the building 200. The gutter 10-1 is installed below the roof 210 of the building 200. The gutter 10-2 receives rainwater from a roof or eaves, etc., below the roof 210 of the building 200. For example, the gutter 10-2 is installed below the gutter 10-1.

[0126] Drain 1 is positioned at the inlet 10b of the gutter 10-1.

[0127] Drain 17 is located at the inlet 10b of the gutter 10-2. Drain 17 does not necessarily have the same configuration as drain 1. Drain 17 may have a well-known configuration.

[0128] The vertical pipe 11-1 is connected to the gutter 10-1 (drain 1 installed in the gutter 10-1) via the horizontal pipe 13-1, the first elbow 14-1, the second elbow 14-2, and the piping member 18. The vertical pipe 11-2 is connected to the gutter 10-2 (drain 17 installed in the gutter 10-2) via the horizontal pipe 13-2, the third elbow 14-3, and the tee 16.

[0129] Horizontal pipe 13-1 is located between the eaves gutter 10-1 and the vertical pipe 11-1. Horizontal pipe 13-2 is located between the eaves gutter 10-2 and the vertical pipe 11-2. Here, the length of horizontal pipe 13-1 is 2m or less, preferably 1m or less.

[0130] The first elbow 14-1 connects the gutter 10-1 to the upstream end 13a of the horizontal pipe 13-1. The second elbow 14-2 connects the downstream end 13b of the horizontal pipe 13-1 to the upstream end 11a of the vertical pipe 11-1. The third elbow 14-3 connects the gutter 10-2 to the upstream end 13a of the horizontal pipe 13-2.

[0131] In this modified example, the first elbow 15-1 is a 90° large-bend elbow (so-called LL) as defined in JIS K 6739. The second elbow 14-2 and the third elbow 14-3 are 90° elbows (so-called DL) as defined in JIS K 6739.

[0132] The cheese (Tee) 16 has an upward-facing first receiving port 16a, a downward-facing second receiving port 16b, and a laterally-facing third receiving port 16c. The cheese 16 combines the fluid flowing in from the first receiving port 16a with the fluid flowing in from the third receiving port 16c, and discharges it from the second receiving port 16b. The angle between the central axis of the first receiving port 16a and the central axis of the third receiving port 16c is 90° or less. As an example, the angle between the central axis of the first receiving port 16a and the central axis of the third receiving port 16c is set to 88.83°. As an example, the material of the cheese 16 is rigid polyvinyl chloride.

[0133] The first socket 16a is connected to the downstream end 11b of the vertical pipe 11-1. The second socket 16b is connected to the upstream end 11a of the vertical pipe 11-2. The third socket 16c is connected to the downstream end 13b of the horizontal pipe 13-2.

[0134] In the eaves gutter drainage structure 100C, a first elbow 14-1 and a second elbow 14-2 are provided between the eaves gutter 10-1 and the vertical pipe 11-1. The direction of the flow path changes in each of the first elbow 14-1 and the second elbow 14-2. When the direction of the flow path changes, pressure loss due to separation can be one of the causes of a decrease in flow rate. In this modified example, the radius of curvature of the second elbow 14-2 is smaller than the radius of curvature of the first elbow 14-1. Therefore, the pressure loss caused by the second elbow 14-2 tends to be greater than the pressure loss caused by the first elbow 14-1. To reduce the decrease in flow rate due to the pressure loss caused by the second elbow 14-2, a piping member 18 is provided.

[0135] The piping member 18 is positioned between the second elbow 14-2 and the vertical pipe 11-1. The piping member 18 comprises a straight pipe section 18a and a projection member 18b.

[0136] The straight pipe section 18a is straight and has a socket 181 at its downstream end. The socket 181 is provided to connect the upstream end 11a of the vertical pipe 11-1 to the straight pipe section 18a. The upstream end of the straight pipe section 18a is connected to the socket 14c of the second elbow 14-2.

[0137] The projection member 18b is located downstream of the second elbow 14-2. More specifically, the projection member 18b is located on the inner circumference of the second elbow 14-2 within the straight pipe section 18a downstream of the second elbow 14-2 and is used to partially reduce the flow path cross-sectional area.

[0138] The surface of the projection member 18b is a curved shape that protrudes from the inner circumference to the outer circumference of the second elbow 14-2. The height of the projection member 18b varies along the direction of the central axis of the vertical pipe 11-1. The projection member 18b has a apex where its height is greatest, located between the upstream end and the downstream end. The height of the projection member 18b increases monotonically from the upstream end towards the apex. The height of the projection member 18b decreases monotonically from the apex towards the downstream end. At the apex, the projection member 18b minimizes the flow path cross-sectional area of ​​the vertical pipe 11-1.

[0139] Thus, by providing the projection member 18b, a reduced portion exists downstream of the second elbow 14-2 where the flow path cross-sectional area is smaller than that of the vertical pipe 11-1. The presence of such a projection member 18b is expected to (1) make it easier for the fluid to flow along the pipe wall than in the absence of the projection member 18b, and (2) reduce the number of areas where pressure loss may occur. Therefore, the projection member 18b can reduce the occurrence of pressure loss due to separation downstream of the second elbow 14-2 and improve the flow rate.

[0140] In the eaves gutter drainage structure 100C, rainwater from the eaves gutter 10-1 flows into the tee 16 through the first elbow 14-1, horizontal pipe 13-1, second elbow 14-2, piping member 18, and vertical pipe 11-1. Similarly, rainwater from the eaves gutter 10-2 flows into the tee 16 through the third elbow 14-3 and horizontal pipe 13-2. The rainwater from the eaves gutter 10-1 and the rainwater from the eaves gutter 10-2 then merge at the tee 16 and are discharged into the manhole 310 through the vertical pipe 11-2.

[0141] [2.4 Other variations] In one modified example, the shape of the threads 241a of the first male threaded portion 241 and the shape of the threads 242a of the second male threaded portion 242 are not particularly limited. Similarly, the shape of the threads 641a of the first female threaded portion 641 and the shape of the threads 642a of the second female threaded portion 642 are not particularly limited.

[0142] In one modified example, the height of the threads 242a of the second male threaded portion 242 does not necessarily decrease as it approaches the downstream end 21b of the first cylindrical portion 21, but may remain constant. Similarly, the height of the threads 642a of the second female threaded portion 642 does not necessarily increase as it approaches the downstream end 61b of the second cylindrical portion 61, but may remain constant.

[0143] In one modified example, the flat portion 643 is not essential. The threads 641a of the first female thread portion 641 and the threads 642a of the second female thread portion 642 may be continuous.

[0144] In one modified example, the drain pipe portion 2, the funnel portion 3, and one or more blades 4 may be formed by injection molding of a resin such as rigid polyvinyl chloride resin, polycarbonate, or ABS, or they may be made of a metal such as cast iron. The drain pipe portion 2, the funnel portion 3, and one or more blades 4 may be formed as a single continuous component, or they may be formed as separate parts.

[0145] In one modified example, the drain pipe portion 2 does not necessarily have to have the first connecting portion 23. The second member 6 does not necessarily have to have the second connecting portion 63.

[0146] In one modified example, when viewed from the direction of the central axis C3 of the funnel portion 3, the outer shape of the funnel portion 3, for example, the reduced diameter portion 31, the small diameter cylindrical portion 32, or the outer shape of the flange 33, is not limited to a circular shape, but may be elliptical, polygonal, or other shapes.

[0147] In one modified example, the funnel portion 3 may not have to have either or both of the small-diameter cylindrical portion 32 and the flange 33.

[0148] In one modified example, the number of blades 4 is not particularly limited. The number of blades 4 may be one or more. The blades 4 may be located between the funnel portion 3 and the drain pipe portion 2, as long as they do not come into contact with the surface of the funnel portion 3 on the drain pipe portion 2 side (second surfaces 312, 332).

[0149] In one modified example, the arm portion 42 of the blade 4 does not necessarily have to extend to the reduced diameter portion 31. In other words, the arm portion 42 does not have to have a second portion 42b. The height of the second portion 42b relative to the drain pipe portion 2 does not have to decrease as it approaches the center of the reduced diameter portion 31.

[0150] In one modified example, the arm portion 42 of the blade 4 does not necessarily have to be connected to the flange 33, but may be connected only to the reduced diameter portion 31. In other words, the arm portion 42 may be connected to the reduced diameter portion 31 without being connected to the flange 33. In this case, there may be a gap between the first surface 331 of the flange 33 and the arm portion 42 in the direction of the central axis C2 of the drain pipe portion 2.

[0151] In one modified example, the first end portion 41a of the main body portion 41 does not have to be inclined to move away from the funnel portion 3 as it approaches the drain pipe portion 2. Therefore, the first end portion 41a may extend along the central axis C2 of the drain pipe portion 2.

[0152] In one modified example, the gap G may be provided by shortening the length of the main body portion 41 of the blade 4 in the radial direction of the drain pipe portion 2, or by forming a notch in the main body portion 41 on the funnel portion 3 side. In short, the gap G should be provided such that the flange 33 of the funnel portion 3 and the main body portion 41 of the blade 4 are spaced apart from each other in the radial direction of the drain pipe portion 2.

[0153] [3. Appearance] As will be apparent from the above embodiments and modifications, this disclosure includes the following aspects.

[0154] [Aspect 1] A first member including a first cylindrical part disposed at an inlet of an eaves gutter, a first flange extending outward from an upstream end of the first cylindrical part, and a drain cylindrical part having a male screw part on an outer peripheral surface of the first cylindrical part; A second member including a second cylindrical part disposed inside the first cylindrical part, a second flange extending outward from an upstream end of the second cylindrical part and sandwiching a peripheral edge of the inlet in the eaves gutter between the second flange and the first flange, and a female screw part on an inner peripheral surface of the second cylindrical part and engaged with the male screw part; Comprising; The male screw part exists in a direction of a first central axis of the first cylindrical part from a downstream end of the first cylindrical part toward an upstream end of the first cylindrical part; The male screw part includes a first male screw part and a second male screw part between the first male screw part and a downstream end of the first cylindrical part; Let the height of a thread of the first male screw part be h1; Let the height of a thread of the second male screw part be h2, then; Satisfying h2 < h1; Drain.

[0155] [Aspect 2] The thread of the first male screw part and the thread of the second male screw part are continuous; The drain of Aspect 1.

[0156] [Aspect 3] The pitch of the thread of the first male screw part is equal to the pitch of the thread of the second male screw part; The drain of Aspect 1 or 2.

[0157] [Aspect 4] Let the length of the male screw part in the direction of the first central axis be L1; Let the length of the first male screw part in the direction of the first central axis be L1a; Let the length of the second male screw part in the direction of the first central axis be L1b, then; 0.5L1 ≤ L1a ≤ 0.9L1, and; L1b = L1 - L1a; Satisfying; The drain of any one of Aspects 1 to 3.

[0158] [Aspect 5] The condition that h2 < 0.5h1 is satisfied. A drain from any one of the embodiments 1 to 4.

[0159] [Aspect 6] The height h2 of the threads in the second male screw portion decreases as it approaches the downstream end of the first cylindrical portion. Drain in aspect 5.

[0160] [Aspect 7] A first member including a drain pipe section having a first cylindrical section positioned at the inlet of the eaves gutter, a first flange extending outward from the upstream end of the first cylindrical section, and a male threaded section on the outer circumferential surface of the first cylindrical section, A second cylindrical portion having the first cylindrical portion positioned inside, a second flange extending outward from the upstream end of the second cylindrical portion and sandwiching the peripheral edge of the inlet in the gutter between itself and the first flange, and a second member having a female screw portion on the inner circumferential surface of the second cylindrical portion that is connected to the male screw portion, Equipped with, The male threaded portion is located in the direction of the first central axis of the first cylindrical portion, from the downstream end of the first cylindrical portion toward the upstream end of the first cylindrical portion. The female thread portion includes a first female thread portion and a second female thread portion between the first female thread portion and the downstream end of the second cylindrical portion. The height of the threads in the first female screw portion is h3. If the height of the threads in the second female screw portion is h4, Satisfying h4 > h3, Drain.

[0161] [Aspect 8] The second cylindrical portion has an overlapping region that overlaps with the male screw portion, The overlapping region includes a first region in which the first female screw portion is disposed in at least a part of it, and a second region in which the second female screw portion is disposed in at least a part of it. The length of the overlapping region in the direction of the second central axis of the second cylindrical portion is L2, The length of the first region in the direction of the second central axis is L2a, If the length of the second region in the direction of the second central axis is L2b, 0.5L2 ≤ L2a ≤ 0.9L2, and, L2b = L2 - L2a, Satisfying Drain in aspect 7.

[0162] [Aspect 9] Satisfying h4 > 2h3, A drain according to embodiment 7 or 8.

[0163] [Aspect 10] The height h4 of the threads in the second female screw portion increases as it approaches the downstream end of the second cylindrical portion. Drain in aspect 9.

[0164] [Aspect 11] The female threaded portion has a flat portion without threads between the first female threaded portion and the second female threaded portion in the direction of the second central axis. A drain from any one of the embodiments 7 to 10.

[0165] [Aspect 12] The second cylindrical portion has an overlapping region that overlaps with the male screw portion, The overlapping region includes a first region in which the first female screw portion is disposed in at least a part of it, and a second region in which the second female screw portion is disposed in at least a part of it. The length of the overlapping region in the direction of the second central axis of the second cylindrical portion is L2, The length of the first region in the direction of the second central axis is L2a, The length of the second region in the direction of the second central axis is L2b, If the length of the planar portion in the direction of the second central axis is L2c, 0.5L2≦L2a≦0.9L2, L2b = L2 - L2a, and L2c < 0.3L2b, Satisfying Drain in aspect 11.

[0166] [Aspect 13] The pitch of the threads in the first female threaded portion and the pitch of the threads in the second female threaded portion are equal. A drain from any one of the embodiments 7 to 12.

[0167] [Aspect 14] A first member including a drain pipe section having a first cylindrical section positioned at the inlet of the eaves gutter, a first flange extending outward from the upstream end of the first cylindrical section, and a male threaded section on the outer circumferential surface of the first cylindrical section, A second cylindrical portion having the first cylindrical portion positioned inside, a second flange extending outward from the upstream end of the second cylindrical portion and sandwiching the peripheral edge of the inlet in the gutter between itself and the first flange, and a second member having a female screw portion on the inner circumferential surface of the second cylindrical portion that is connected to the male screw portion, Equipped with, The male threaded portion is located in the direction of the first central axis of the first cylindrical portion, from the downstream end of the first cylindrical portion toward the upstream end of the first cylindrical portion. The male threaded portion includes a first male threaded portion and a second male threaded portion between the first male threaded portion and the downstream end of the first cylindrical portion. The female thread portion includes a first female thread portion coupled to the first male thread portion, and a second female thread portion located between the first female thread portion and the downstream end of the second cylindrical portion, which is coupled to the second male thread portion. The height of the threads in the first male screw portion is h1, The height of the threads in the second male screw portion is h2. The height of the threads in the first female screw portion is h3. If the height of the threads in the second female screw portion is h4, h2 h4>h3, Satisfying Drain.

[0168] [Aspect 15] The first member is, A funnel portion located at the upstream end of the drain pipe section, which includes a reduced diameter section in which the outer and inner diameters decrease as it approaches the drain pipe section, ​One or more vanes connecting the drain pipe section and the funnel section, Furthermore, The aforementioned one or more feathers are A plate-shaped main body portion protruding from the upstream end of the aforementioned drain pipe portion, An arm portion connecting the side of the funnel portion opposite to the drain pipe portion and the main body portion, Includes, There is a gap between the main body and the outer surface of the funnel portion that is on the drain pipe side. Drain in aspect 14.

[0169] The aspects described in sections 2-6, 8-13, and 15 are not mandatory. [Industrial applicability]

[0170] This disclosure is applicable to drains. Specifically, this disclosure is applicable to drainage drains used in gutters. [Explanation of Symbols]

[0171] 1 Drain 5. First Member 6. Second Member 10 Gutters 10b Inlet 21 First tube part 21a Upstream end 21b Downstream end 22 First Flange 24 Male threaded section 241 First male thread section 241a Screw thread 242 Second male thread section 242a Screw thread 61 Second cylinder part 61a Upstream end 61b Downstream end 62 Second flange 64 Female thread section 640 Duplicate area 640a 1st area 640b 2nd area 641 First female thread section 641a Screw thread 642 Second female thread section 642a Screw thread 643 Plane part

Claims

1. A first member including a drain pipe section having a first cylindrical section positioned at the inlet of the eaves gutter, a first flange extending outward from the upstream end of the first cylindrical section, and a male threaded section on the outer circumferential surface of the first cylindrical section, A second cylindrical portion that houses the first cylindrical portion on its inside, a second flange that extends outward from the upstream end of the second cylindrical portion and sandwiches the peripheral edge of the inlet of the gutter between itself and the first flange, and a second member having a female screw portion on the inner circumferential surface of the second cylindrical portion that is connected to the male screw portion, Equipped with, The male threaded portion is located in the direction of the first central axis of the first cylindrical portion, from the downstream end of the first cylindrical portion toward the upstream end of the first cylindrical portion. The male threaded portion includes a first male threaded portion and a second male threaded portion between the first male threaded portion and the downstream end of the first cylindrical portion. The height of the threads in the first male screw portion is h1, If the height of the threads in the second male screw portion is h2, Satisfying h2 < h1, Drain.

2. The threads of the first male screw portion and the threads of the second male screw portion are continuous. The drain according to claim 1.

3. The pitch of the threads of the first male threaded portion and the pitch of the threads of the second male threaded portion are equal. The drain according to claim 1.

4. The length of the male screw portion in the direction of the first central axis is L1, The length of the first male screw portion in the direction of the first central axis is L1a, If the length of the second male screw portion in the direction of the first central axis is L1b, 0.5L1 ≤ L1a ≤ 0.9L1, and, L1b=L1-L1a, Satisfying The drain according to claim 1.

5. The condition that h2 < 0.5h1 is satisfied, The drain according to claim 1.

6. The height h2 of the threads in the second male screw portion decreases as it approaches the downstream end of the first cylindrical portion. The drain according to claim 5.

7. A first member including a drain pipe section having a first cylindrical section positioned at the inlet of the eaves gutter, a first flange extending outward from the upstream end of the first cylindrical section, and a male threaded section on the outer circumferential surface of the first cylindrical section, A second cylindrical portion that houses the first cylindrical portion on its inside, a second flange that extends outward from the upstream end of the second cylindrical portion and sandwiches the peripheral edge of the inlet of the gutter between itself and the first flange, and a second member having a female screw portion on the inner circumferential surface of the second cylindrical portion that is connected to the male screw portion, Equipped with, The male threaded portion is located in the direction of the first central axis of the first cylindrical portion, from the downstream end of the first cylindrical portion toward the upstream end of the first cylindrical portion. The female thread portion includes a first female thread portion and a second female thread portion between the first female thread portion and the downstream end of the second cylindrical portion. The height of the threads in the first female screw portion is h3. If the height of the threads in the second female screw portion is h4, Satisfying h4 > h3, Drain.

8. The second cylindrical portion has an overlapping region that overlaps with the male screw portion, The overlapping region includes a first region in which the first female screw portion is disposed in at least a part of it, and a second region in which the second female screw portion is disposed in at least a part of it. The length of the overlapping region in the direction of the second central axis of the second cylindrical portion is L2, The length of the first region in the direction of the second central axis is L2a, If the length of the second region in the direction of the second central axis is L2b, 0.5L2 ≤ L2a ≤ 0.9L2, and, L2b=L2-L2a, Satisfying The drain according to claim 7.

9. The conditions that satisfy h4 > 2h3 The drain according to claim 7.

10. The height h4 of the threads in the second female screw portion increases as it approaches the downstream end of the second cylindrical portion. The drain according to claim 9.

11. The female threaded portion has a flat portion without threads between the first female threaded portion and the second female threaded portion in the direction of the second central axis. The drain according to claim 8.

12. The second cylindrical portion has an overlapping region that overlaps with the male screw portion, The overlapping region includes a first region in which the first female screw portion is disposed in at least a part of it, and a second region in which the second female screw portion is disposed in at least a part of it. The length of the overlapping region in the direction of the second central axis of the second cylindrical portion is L2, The length of the first region in the direction of the second central axis is L2a, The length of the second region in the direction of the second central axis is L2b, If the length of the planar portion in the direction of the second central axis is L2c, 0.5L2≦L2a≦0.9L2, L2b = L2 - L2a, and L2c<0.3L2b, Satisfying The drain according to claim 11.

13. The pitch of the threads in the first female screw portion and the pitch of the threads in the second female screw portion are equal. The drain according to claim 7.

14. A first member including a drain pipe section having a first cylindrical section positioned at the inlet of the eaves gutter, a first flange extending outward from the upstream end of the first cylindrical section, and a male threaded section on the outer circumferential surface of the first cylindrical section, A second cylindrical portion that houses the first cylindrical portion on its inside, a second flange that extends outward from the upstream end of the second cylindrical portion and sandwiches the peripheral edge of the inlet of the gutter between itself and the first flange, and a second member having a female screw portion on the inner circumferential surface of the second cylindrical portion that is connected to the male screw portion, Equipped with, The male threaded portion is located in the direction of the first central axis of the first cylindrical portion, from the downstream end of the first cylindrical portion toward the upstream end of the first cylindrical portion. The male threaded portion includes a first male threaded portion and a second male threaded portion between the first male threaded portion and the downstream end of the first cylindrical portion. The female thread portion includes a first female thread portion coupled to the first male thread portion, and a second female thread portion located between the first female thread portion and the downstream end of the second cylindrical portion, which is coupled to the second male thread portion. The height of the threads in the first male screw portion is h1, The height of the threads in the second male screw portion is h2. The height of the first female screw portion is h3, If the height of the second female thread portion is h4, h2 < h1, and, h4 > h3, Satisfying Drain.

15. The first member is, A funnel portion located at the upstream end of the drain pipe section, which includes a reduced diameter section in which the outer and inner diameters decrease as it approaches the drain pipe section, One or more blades connecting the drain pipe section and the funnel section, Furthermore, The one or more feathers mentioned above are, A plate-shaped main body portion protruding from the upstream end of the aforementioned drain pipe portion, An arm portion connecting the side of the funnel portion opposite to the drain pipe portion and the main body portion, Includes, There is a gap between the main body and the outer surface of the funnel portion that is on the drain pipe side. The drain according to claim 14.

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