Drain components and rain gutter piping structure, buildings, roofs

Abstract

To provide a drain member that excels in workability.SOLUTION: A drain member is fitted on a gutter that has a prepared hole 11H formed on the bottom plate 11, consisting of a lower drain member 110 and an upper drain member 120. The lower drain member comprises: a lower flange part 111 which, being arranged on the bottom surface of the bottom plate 11, has a receiving opening formed on its inner periphery; an outer cylinder part 112L which, being formed under the lower flange part 111, extends downwards; and an inner periphery screw portion 115 formed on the inner peripheral surface of the outer cylinder part 112L. The upper drain member comprises: an upper flange part 121 which, being arranged on the upper surface of the bottom plate 11, has a chute part 121H formed on the inner peripheral side; an inner cylinder part 122 which, being formed under the upper flange part, extends downwards and is inserted into the outer cylinder part 112L; and an outer screw part 125 that is formed on the outer peripheral surface of the inner cylinder part 122 to engage with the inner screw part 115. The upper drain member 120 comprises alignment parts that are arranged at partial positions on the bottom surface of the upper flange part 121 corresponding to the peripheral part of the prepared hole 11H.SELECTED DRAWING: Figure 7E

Description

Technical Field

[0001] This invention relates to a drain member attached to an eaves gutter and connecting the eaves gutter to a downstream vertical gutter or joint, and a rain gutter piping structure.

Background Art

[0002] As is well known, a drain member having a high drainage function provided inside a large eaves gutter arranged at the eaves of a building of a large facility such as a factory or a shopping center is widely used.

[0003] Such a drain member generally includes a drain member having a lower drain member disposed on the lower surface sandwiching the bottom plate of the eaves gutter and an upper drain member disposed on the upper surface. A drain member provided with such a lower drain member and an upper drain member is applied to various uses.

[0004] For example, Patent Document 1 discloses an eaves gutter drain installed on an eaves gutter so as to penetrate an opening for rainwater drainage provided in the bottom plate of the eaves gutter. Near the inner peripheral end of the lower surface of the upper flange of the upper unit (upper drain part), it is possible to engage with the peripheral edge of a circular opening (lower hole) in the bottom plate of the eaves gutter, and a drain provided with an engaging part formed of a cylindrical surface part is disclosed. Further, it is disclosed that this makes it easier to arrange the upper unit at a predetermined position on the peripheral edge of the opening (lower hole) of the eaves gutter with higher accuracy.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, when inserting the drain component into the pilot hole of the gutter, the drain component would come into contact with the gutter, or the upper drain and lower drain, making insertion difficult and indicating room for improvement in ease of installation.

[0007] This invention has been made in consideration of these circumstances, and aims to provide a drain member and a rain gutter piping structure that offer excellent workability. [Means for solving the problem]

[0008] To solve the above problems, this invention proposes the following means. (1) A drain member to be attached to a gutter having a bottom plate and side plates extending upward from both ends in the width direction of the bottom plate, wherein a pilot hole is formed in the bottom plate, the lower drain member having a lower flange portion disposed on the lower surface of the bottom plate and having a receiving opening formed on its inner circumference, an outer cylinder portion formed below the lower flange portion and extending downward, an outer cylinder diameter reduction portion connecting the lower flange portion and the upper end of the outer cylinder portion and decreasing in diameter as it goes downward, and an inner circumference screw portion formed on the inner circumference surface of the outer cylinder portion, disposed on the upper surface of the bottom plate The upper drain member comprises an upper flange portion having a drain opening formed on its inner circumference, an inner cylinder portion formed below the upper flange portion and extending downward and inserted into the outer cylinder portion, an inner cylinder diameter reduction portion connecting the upper flange portion and the upper end of the inner cylinder portion and decreasing in diameter as it extends downward, and an outer thread portion formed on the outer surface of the inner cylinder portion and screwed into the inner circumference thread portion, wherein the upper drain member includes an alignment portion partially positioned on the lower surface of the upper flange portion at a location corresponding to the periphery of the pilot hole. (2) A drain member wherein the alignment portion is a bent portion. (3) A drain member wherein the alignment portion is a stepped portion. (4) A drain member wherein the alignment portion is formed at equal intervals in the circumferential direction. (5) A drain member wherein the alignment portion is provided straddling the parting line or at a position 90 degrees away from the parting line in the circumferential direction. (6) A drain member wherein at least one of the alignment portions is formed such that, in a plan view, it straddles the position of the upper end of the outer peripheral thread portion of the upper drain member, or the upper end of the outer peripheral thread portion and the end of the alignment portion are at the same position. (7) In the drain member and the lower drain member, the inner circumferential thread portion is formed at a distance from the upper end of the outer cylinder portion. (8) A rain gutter piping structure comprising a gutter having a bottom plate and side plates extending upward from both ends in the width direction of the bottom plate, with a pilot hole formed in the bottom plate, a drain member of any of (1) to (7), a downpipe provided downstream of the drain member, and a joint connecting the drain member and the downpipe. [Effects of the Invention]

[0009] This invention provides a drain member and a rain gutter piping structure that offer excellent workability. [Brief explanation of the drawing]

[0010] [Figure 1] This is a side view illustrating a rain gutter piping structure equipped with a drain member (drain member) according to the first embodiment of the present invention. [Figure 2] This is a perspective view illustrating the general configuration of the drain member according to the first embodiment, showing it attached to a gutter. [Figure 3] This is a perspective view illustrating the details of the upper drain member according to the first embodiment. [Figure 4] This is a perspective view illustrating the details of the drain member according to the first embodiment. [Figure 5] This is a schematic diagram perpendicular to the longitudinal direction of the gutter illustrating the general configuration of the drain member according to the first embodiment. [Figure 6] This is an exploded schematic diagram, including a gutter, illustrating the general configuration of the drain member according to the first embodiment. [Figure 7A] It is a longitudinal sectional view showing an assembled state for explaining the schematic configuration of the drain member according to the first embodiment. [Figure 7B] It is a longitudinal sectional view showing a disassembled state for explaining the schematic configuration of the drain member according to the first embodiment. [Figure 7C] It is a longitudinal sectional view for explaining the schematic configuration of the drain opening portion of the drain member according to the first embodiment. [Figure 7D] It is a longitudinal sectional view of a modified example of the insertion guide portion of the lower drain member according to the first embodiment. [Figure 7E] It is a view of the upper drain member of the drain member (FIG. 7B) according to the first embodiment as viewed in the direction of arrow A. [Figure 8A] It is a longitudinal sectional view showing an assembled state for explaining the schematic configuration of the drain member according to the third embodiment of the present invention. [Figure 8B] It is a longitudinal sectional view showing a disassembled state for explaining the schematic configuration of the drain member according to the third embodiment. [Figure 9A] It is a longitudinal sectional view showing an assembled state for explaining the schematic configuration of the drain member according to the fourth embodiment of the present invention. [Figure 9B] It is a longitudinal sectional view showing a disassembled state for explaining the schematic configuration of the drain member according to the fourth embodiment. [Figure 9C] It is a longitudinal sectional view for explaining the schematic configuration of the positioning edge portion formed on the upper drain member according to the fourth embodiment. [Figure 9D] It is a longitudinal sectional view of a modified example of the insertion guide portion of the lower drain member according to the fourth embodiment. [Figure 9E] It is a view of the upper drain member of the drain member (FIG. 9B) according to the fourth embodiment as viewed in the direction of arrow A. [Figure 10A] It is a longitudinal sectional view showing an assembled state for explaining the schematic configuration of the drain member according to the fifth embodiment of the present invention. [Figure 10B] It is a longitudinal sectional view showing a disassembled state for explaining the schematic configuration of the drain member according to the fifth embodiment. [Figure 11A] It is a perspective view of a modified example of the upper drain member of the present invention. [Figure 11B]This is a side view of a modified example of the upper drain member of the present invention. [Figure 11C] This is a view of the upper drain member of the present invention, as seen from direction A. [Figure 12] This is a partial cross-sectional view showing the funnel portion and longitudinal ribs of the upper drain member having a funnel portion. [Modes for carrying out the invention]

[0011] <First Embodiment> The first embodiment of the present invention will be described below with reference to Figures 1 to 7E. Figure 1 is a side view illustrating a rain gutter piping structure equipped with a drain member according to the first embodiment of the present invention. Figures 2 to 6 are schematic diagrams illustrating a siphon drain member according to the first embodiment. In the diagram, reference numeral 1 indicates the rain gutter piping structure (piping structure), reference numeral 10 indicates the eaves gutter, reference numeral 11 indicates the bottom plate, reference numeral 12 indicates the side plate, and reference numeral 11H indicates the pilot hole. Also, reference numeral 100 indicates the drain member, reference numeral 110 indicates the lower drain member, reference numeral 120 indicates the upper drain member, and reference numeral 150 indicates the siphon section. Note that shapes and other details are exaggerated in the drawing for clarity of explanation, and the dimensional relationships in the drawing are not necessarily consistent with reality.

[0012] Rain gutter piping structure (As shown in Figure 1, piping structure 1 includes, for example, a gutter 10, a drain member 100 fitted into a circular pilot hole (through hole) 11H formed in the bottom surface 11 of the gutter 10, a first elbow (elbow member) 20 connected to the lower side of the drain member 100, a downpipe 24 connected to the downstream side of the first elbow 20, a second elbow (elbow member) 25 connected to the downstream side 24B of the downpipe 24, and a downpipe 30 connected to the downstream side of the second elbow 25.

[0013] As shown in Figures 1, 2, 5, and 6, the gutter 10 comprises, for example, a bottom plate 11 and side plates 12 extending upward from both ends of the bottom plate 11 in the width direction, and is formed in a groove-shaped cross section when viewed along the longitudinal direction. In addition, a circular pilot hole 11H is formed in the bottom plate 11, penetrating the bottom plate 11 in the thickness direction. The gutter 10 is suspended by a support (not shown) attached to a fascia board (not shown) to receive rainwater flowing down from the eaves (not shown) of the roof. The support may be a gutter hanger attached to the fascia board or a gutter support attached to the roof, and is not particularly limited.

[0014] In this embodiment, the eaves gutter 10 is an extruded product formed from, for example, rigid polyvinyl chloride resin, ABS, AES, or other synthetic resins. Furthermore, the material used to form the eaves gutter 10 can be arbitrarily determined and is not limited to synthetic resin; for example, it may be formed from an extruded metal product.

[0015] Furthermore, when the gutter 10 is made of synthetic resin, it is preferable that the coefficient of linear expansion be 2.0 × 10⁻⁵ / °C or less to prevent expansion and contraction due to heat. It is preferable to reduce the coefficient of linear expansion by inserting a low-stretch sheet, such as a PET resin sheet or an iron sheet, stretched to the center of the thickness direction of the gutter 10, or by incorporating low-stretch additives such as wollastonite or carbon fiber into the synthetic resin that makes up the gutter 10. When using a low-stretch sheet, it may be made of one sheet, two sheets, or multiple sheets. By making it of multiple sheets, for example, on the side of the gutter opposite the building (the left side in Figure 1), where sunlight is more likely to hit, a weather-resistant sheet can be used, or a high-strength sheet can be used in areas where strength is required, thereby obtaining a low-cost gutter with multiple functions.

[0016] Furthermore, the gutter 10 has a bottom width of 100 mm or more, preferably 300 mm or less, and more preferably 200 mm or less. Also, the gutter 10 has a side plate 12 height of 90 mm or more, preferably 300 mm or less, and more preferably 200 mm or less. The gutter 10 may be applied to a large-diameter downpipe that can carry rainwater at a flow rate of 4 liters / sec or more and 90 liters / sec or less. Furthermore, the height of the side panel 12 may be different or the same for the side panel 12 on the building side (the right side panel 12 in Figure 1) and the side panel 12 on the opposite side of the building (the left side panel in Figure 1), as shown in Figure 1. There are no restrictions on the diameter of the downpipe, but examples include 50A, 75A, 100A, 150A, and 200A.

[0017] As shown in Figures 1 to 6, the drain member 100 comprises, for example, a lower drain member 110, an upper drain member 120, and a siphon section 150 positioned above the upper drain member 120, and is attached to the gutter 10. Specifically, the lower drain member 110 is positioned on the lower surface 11B side of the bottom plate 11 of the gutter 10, and the upper drain member 120 is positioned on the upper surface 11A side of the bottom plate.

[0018] The material used to form the drain member 100 can be arbitrarily determined. In this embodiment, the drain member 100 is an injection-molded product formed from, for example, a synthetic resin such as rigid polyvinyl chloride, polycarbonate, ABS, or AES. However, it is not limited to synthetic resins and may also be formed by casting cast iron, stainless steel, or aluminum. Details of the lower drain member 110 and the upper drain member 120 will be described later. The siphon section 150 will be described below with reference to Figures 2 to 6.

[0019] As shown in Figures 2 to 6, the siphon section 150 includes, for example, a lid member 151, a vertical rib 155 connecting the upper drain member 120 and the lid member 151, a gripping rib 156, and a guide 157. The siphon section 150 is also positioned above the upper drain member 120. Furthermore, the gripping rib 156 is not required, and the longitudinal rib 155 may be used as a substitute for the gripping rib 156.

[0020] As shown in Figures 2 and 3, the lid member 151 is, for example, a circular disc-shaped member in plan view, positioned above the upper drain member 120. Furthermore, the lid member 151 is coaxial with the pipe axis of the upper drain member 120. The portion formed between the outer peripheral edge 151A of the lid member 151 and the outer peripheral edge 121C of the upper drain member 120 constitutes the inlet opening 101A through which rainwater W accumulated in the eaves gutter 10 flows into the outlet section 121H.

[0021] The inlet opening 101A is located in a direction perpendicular to the horizontal plane and refers to the space between the outer edge 151A of the cover member 151 and the upper surface 11A of the gutter 10, or the space between the upper flange portion 121 of the upper drain member 120. For example, if the outer peripheral edge 151A of the lid member 151 is larger than the outer peripheral edge 121C of the upper flange portion 121, the inlet opening 101A will be the portion formed between the outer peripheral edge 151A of the lid member 151 and the upper surface 11A of the gutter 10. If the outer peripheral edge 151A of the lid member 151 is smaller than the outer peripheral edge 121C of the upper flange portion 121, the inlet opening 101A will be the portion formed between the outer peripheral edge 151A of the lid member 151 and the upper surface 121A of the upper flange portion 121.

[0022] The area of ​​the inlet opening 101A is larger than the opening area A1 of the drop-off section 121H described above, and the size, height, and shape of the lid member 151, which will be described later, are adjusted accordingly. In this embodiment, the area of ​​the inlet opening 101A can be determined by multiplying the circumference of the circular lid member 151, i.e., the length of the outer edge 151A, by the height H of the lid member 151.

[0023] The lid member 151 is supported on the upper flange portion 121 while being supported from below by a plurality of vertical ribs 155. Furthermore, as described above, the cover member 151 is positioned inside the gutter 10, spaced upward from the outlet portion 121H, and has an inlet opening 101A on the upper surface 11A of the gutter 10 below the cover member 151, which allows rainwater W to flow into the outlet portion 121H. Furthermore, it is preferable that the lid member 151 is positioned at a height H of 10 to 60 mm upward from the outer peripheral edge 151A of the lid member 151.

[0024] Furthermore, while the size of the lid member 151 when viewed from above can be arbitrarily set, it is preferable that it be positioned to cover the opening of the drain portion 121H and that it be set to be larger than the opening area of ​​the drain portion 121H. It may also be set to be equal to or smaller than the opening area of ​​the drain portion 121H.

[0025] Furthermore, it is more preferable that the height H of the lid member 151 is set 30 to 40 mm above the outer peripheral edge 151A of the lid member 151, and that the diameter of the lid member 151 is set to 150 to 200% of the outer diameter R1 of the opening of the drop-off portion 121H. If the diameter of the cover member 151 is less than 150% of the outer diameter R1 of the outlet portion 121H, the water level in the gutter 10 will be lower than the cover member 151, and the cover member 151 may not come into contact with the incoming water. Also, if the diameter of the cover member 151 exceeds 200%, the proportion of the water flow entering from the inlet opening 101A that collides with the cover member 151 will increase, potentially causing the water level in the gutter 10 to become too high above the cover member 151, thus reducing the siphon performance.

[0026] Furthermore, in order for the siphon effect to occur, a certain water level is necessary to facilitate the creation of a full flow state at the opening, and it is desirable that the water level inside the gutter 10 be higher than the inlet opening 101A, and that the height H of the cover member 151 be lower than the maximum water level inside the gutter 10. To ensure stable siphon action, the height H of the lid member 151 is preferably 0.1 to 0.5 times the maximum water level in the gutter 10, and more preferably 0.2 to 0.45 times. The maximum water level in the gutter 10 refers to the lowest height from the bottom surface 11 of the side plate 12 of the gutter 100.

[0027] Furthermore, the inner diameter (outer diameter of the opening) R1 of the inner circumferential hole 122H of the inner cylinder portion 122, which is suitable for providing the lid member 151 set in the above position, is preferably 50 mm or more and 170 mm or less. In other words, by setting the outer diameter of the opening R1 of the outlet portion 121H to the lower limit of 50 mm or more, the large flow rate of wastewater generated in the siphon portion 150 can be drained smoothly. Furthermore, by limiting the upper limit to 170mm or less, the overall size is reduced, preventing the need for larger joints and support fixtures.

[0028] Furthermore, as shown in Figures 2 to 6, the lid member 151 is provided with gripping ribs 156 that protrude upward from the upper surface 151B and are spaced apart in the circumferential direction. By gripping these gripping ribs 156, the rotational operation when tightening the drain member 100 can be easily performed.

[0029] Furthermore, the gripping rib 156 consists of a rib body 156A that extends in the circumferential direction and extensions 156B that protrude outward from both ends of the rib body 156A. Between adjacent gripping ribs 156, 156 in the circumferential direction, for example, when attaching the drain member 100 to the first elbow 20, a rod-shaped member can be engaged and tightened by rotating the rod-shaped member. Furthermore, since gaps are formed between the gripping ribs 156, fallen leaves and other debris inside the gutter 10 can pass through more easily, preventing them from becoming entangled.

[0030] As shown in Figures 3 to 6, the guide guides 157 are provided radially from the drain axis O at the center of the lower surface 151C of the lid member 151 in a plan view, with each guide having a curve that gradually extends downward toward the drain axis O (center of the lid). The guidance guide 157 is for guiding rainwater W in the eaves gutter 10 from the inlet opening 101A to the outlet (opening of the outlet 121H). The guidance guide 157 may also be formed by a funnel-shaped or cylindrical wall portion with holes formed at its upper and lower ends.

[0031] As shown in Figure 3, the vertical ribs 155 connect the upper surface 121A of the upper drain member 120 to the outer periphery of the lower surface 151C of the cover member 151. That is, the cover member 151 is supported from below by multiple vertical ribs 155 and held at a position that secures a predetermined height H from the upper surface 11A of the gutter 10. These vertical ribs 155 are provided at the inlet opening 101A, intersect with respect to the radial direction in a plan view, and are formed in a curved shape. In other words, the vertical ribs 155 have the function of straightening the flow of rainwater W that flows from the inlet opening 101A to the outlet 121H.

[0032] In the siphon section 150, the inner diameter of the inner circumferential hole 122H of the inner cylinder section 122 and the upper surface 123A on the inner side to which the upper flange section 121 is connected have a bell mouth shape formed as a tapered or curved surface. When this upper surface (connecting portion) 123A on the inner side is curved, the radius of curvature of the cross-section in the direction parallel to the drain axis O is preferably 5 mm to 30 mm.

[0033] Next, the function of the siphon section 150 of the drain member 100 described above will be explained. Note that the present invention does not necessarily require the siphon section 150. However, having the siphon section 150, as in this embodiment, is preferable because it provides the function described below and results in a drain member with excellent drainage performance.

[0034] High siphon performance means that the siphon phenomenon occurs continuously. On the other hand, low siphon performance means that the siphon phenomenon does not occur, or does not occur continuously, but rather occurs irregularly, alternating between occurring and not occurring. If the siphon phenomenon does not occur continuously, when the amount of water flowing in increases, the amount of water being drained may not be able to keep up, potentially causing the gutter to overflow. Also, the water level in the gutter will fluctuate, potentially leading to unstable drainage. When the siphon phenomenon occurs continuously, the water level remains low.

[0035] As shown in Figure 3, the siphon section 150, when viewed from above, seals the opening of the downspout section 121H, and even when a large amount of rainwater flows in through the inlet opening 101A during heavy rain, it prevents air from being drawn in, causing the downspout 30 to become full of water and create a water seal. As a result, a siphon effect can be generated on the downstream side.

[0036] Such a siphon drain member 100 is installed, for example, inside the eaves gutter 10 located at the eaves of a rain gutter piping structure 1 attached to a building of a large facility such as a factory or shopping center, and exhibits high drainage functionality.

[0037] The first elbow (elbow member, joint member) 20 is a joint installed on the downstream side of the drain member 100. As shown in Figure 1, the first elbow 20 is connected to the lower side of the drain member 100. As shown in Figure 1, the first elbow 20 includes a first socket (one end) 21, a second socket (the other end) 22, and a curved pipe section 23 that curves approximately 90° in a side view. The degree of curvature of the curved pipe section 23 is not particularly limited; for example, it may include a curved pipe section 23 that curves 45° in a side view. Thus, the angle of curvature of the curved pipe section 23 can be appropriately selected depending on the construction site. Alternatively, the curved pipe section 23 may be omitted, and the drain member 100, the joint, and the downpipe 30 may be connected to create a straight drop.

[0038] The first receiving portion 21 is formed with an inner diameter that allows connection to the lower drain member 110 of the drain member 100. As shown in Figure 1, a receiving bottom surface 21A is formed at the connection point with the curved pipe portion 23, which is tapered toward the curved pipe portion 23. This receiving bottom surface 21A abuts against the end of the inserted pipe, ensuring the relative position with the pipe.

[0039] In order to allow rainwater W to flow smoothly without reducing the flow velocity of rainwater W flowing in from the first socket 21, it is preferable that the curved pipe section 23 is formed such that, when viewed in a cross-section including the pipe axis (along the pipe axis), the radius of curvature of the outer wall section (the side with less curvature) and the inner wall section is at least greater than 64 mm and less than 125 mm. Furthermore, the second socket portion 22 of the first elbow 20 is connected to the upstream end of the downspout 24.

[0040] The connecting pipe 24 is a component that horizontally guides rainwater W flowing down from the first elbow 20, and horizontally directs rainwater W flowing down from the siphon drain component 100. It is a straight pipe that extends horizontally. The downstream side is connected to the upper end 30A of the downpipe 30 by the second elbow 25.

[0041] Furthermore, for example, if the length of the connecting pipe exceeds 2.0m, the flow velocity may decrease due to frictional resistance in the connecting pipe 24, interrupting the full flow state and potentially preventing the siphon effect from continuing. For this reason, it is preferable that the length of the connecting pipe 24 from its upstream end to its downstream end 24B (connecting pipe length) be between 0.6m and 2.0m, and more preferably between 0.6m and 1.0m. By setting the length of the downpipe within the aforementioned range, rainwater W flowing down from the first elbow 20 can be smoothly drained when the pipe is full. The first socket of the second elbow 25 is connected to the downstream end 24B of the downpipe 24. The second elbow 25 has the same configuration as the first elbow 20.

[0042] The upper end portion 30A of the downpipe 30 is connected to the second socket portion of the second elbow 25. The downpipe 30 is a component that carries rainwater W flowing down the second elbow 25 vertically, and is a straight pipe extending in the vertical direction. The lower end of the downpipe 30 is connected to, for example, a catch basin (not shown) that is connected to the ground and buried underground. The catch basin is configured to be connected to a drainage structure such as a sewer pipe via a connecting pipe (not shown).

[0043] The downpipe 30 is a straight pipe installed vertically along the exterior wall of the building, and is a component that allows rainwater W flowing down from the second elbow 25 to flow downward. Furthermore, the height from the upper end to the lower end of the downpipe 30 is, for example, 2.0 m or more, preferably 3.0 m or more, and more preferably 4.0 m or more. By keeping the length (height dimension) of the downpipe within the above range, the siphon effect in the downpipe 30 can be generated and maintained effectively. As the length of the downpipe increases, the amount of rainwater W flowing down to the lower end increases, and the rainwater W flows vigorously into the catch basin.

[0044] In the rain gutter 1 assembled in this manner, rain that falls on the roof flows into the siphon drain member 100 provided in the eaves gutter 10 through the inflow opening 101A, passes through the outlet section 121H, flows through the first elbow 20, the connecting gutter 24, and the second elbow 25, and flows down into the downpipe 30. The rainwater W that flows from the downpipe 24 into the downpipe 30 then flows down into a drainpipe (not shown) buried underground. At this time, the downstream side of the drain member 100 is sealed with water when full, so the downpipe 30 is filled with water as it flows down, causing a siphon effect to occur in the outlet 121H, the downpipe 24, and the downpipe 30, and the water is forcefully drained from the downpipe 30 to the drainpipe (not shown).

[0045] Next, with reference to Figures 7A to 7E, the lower drain member 110 and the upper drain member 120 that constitute the drain member 100 will be described. Figure 7A is a longitudinal cross-sectional view showing the assembled state illustrating the schematic configuration of the drain member according to the first embodiment, and Figure 7B is a longitudinal cross-sectional view showing the disassembled state. Figure 7C is a longitudinal cross-sectional view illustrating the schematic configuration of the outlet portion of the drain member, and Figure 7E is a view of the upper drain member of the drain member as seen from arrow A in Figure 7B. Note that Figures 7A and 7B are simplified diagrams of the drain member with the siphon portion omitted.

[0046] As described above, the drain member 100 includes a lower drain member 110, an upper drain member 120, and a siphon section 150 positioned above the upper drain member 120. However, the siphon section is not required.

[0047] As shown in Figures 7A and 7B, the lower drain member 110 includes, for example, a lower flange portion 111 positioned on the lower surface 11B of the gutter 10, an outer cylinder portion 112 formed below the lower flange portion 111 and extending downward, an outer cylinder reduced diameter portion 113 connecting the lower flange portion 111 and the outer cylinder portion 112, and an inner circumferential thread portion 115 formed on the inner circumferential surface of the outer cylinder portion 112.

[0048] The lower flange portion 111 is formed, for example, with a circular outer shape in plan view, and a circular receiving opening 111H is formed on the inner circumference in plan view. In other words, the lower flange portion 111 is formed from a ring-shaped flat plate in plan view. Furthermore, the lower flange portion 111 has a flat upper surface 111A on the outer circumference, and a recessed area on the inner circumference that is indented downward relative to the flat surface. The upper surface 111A of the lower flange portion 111 is positioned on the lower surface 11B of the bottom plate 11 of the gutter 10.

[0049] The outer cylinder portion 112 is formed, for example, in a cylindrical shape centered on the pipe axis O1, and extends vertically when attached to the gutter 10. Furthermore, an inner circumferential hole 112H is formed inside the outer cylinder portion 112, which penetrates vertically. Furthermore, an internal threaded portion 115 is formed on the inner circumferential surface of the outer cylinder portion 112. Furthermore, four tool mounting recesses (recesses) 118, which are recessed upwards, are formed at 90° intervals in the circumferential direction on the lower end 112T of the outer cylinder portion 112. The number of tool mounting recesses (recesses) 118 provided in the circumferential direction is not limited, but it is preferable to have two or more, as this makes it easier to attach tools and perform the work. The position and number of tool mounting recesses (recesses) 118 can be set arbitrarily. Furthermore, the vertical position of the upper bottom surface 118A of the tool mounting recesses (recesses) 118 can be set arbitrarily, but it is preferable that it be formed above the lower end portion 112T of the inner cylinder 122.

[0050] As shown in Figures 7A and 7B, the outer cylinder reduced diameter portion 113 connects the lower flange portion 111 and the upper end of the outer cylinder portion 112 by decreasing in diameter as it extends downward. Furthermore, an insertion guide portion (continuously reduced inner diameter surface) 113G is formed on the inner circumferential surface of the outer cylinder reduced diameter portion 113. In this embodiment, the insertion guide portion (continuously reduced inner diameter surface) 113G is formed, for example, by an inclined surface on the inner circumferential side of a substantially conical cylinder that is continuously reduced in diameter from the upper end of the outer cylinder reduced diameter portion 113 to the inner circumferential surface of the outer cylinder portion 112. In other words, the insertion guide portion (continuously reduced inner diameter surface) 113G is configured without any steps or bulges that protrude on the inner circumferential side and cause snagging.

[0051] Furthermore, the shape of the continuous diameter-reducing inner surface can be arbitrarily set and is not limited to an inclined surface formed in a substantially conical shape in which the cross-section including the pipe axis O1 is reduced in diameter in a straight line. For example, it may be configured such that the cross-section is reduced in a curved shape, or an inclined surface that combines straight and curved lines.

[0052] Furthermore, as shown in Figure 7D, for example, the outer cylinder reduced diameter portion 113 may have a stepped portion. Specifically, the outer cylinder reduced diameter portion 113 comprises a large diameter portion 113A that forms the upper end of the outer cylinder reduced diameter portion 1133 and reduces in diameter from the upper end downwards, and a small diameter portion 113B that is connected to the lower end of the large diameter portion 113A and has a smaller diameter than the large diameter portion 113A. The large diameter portion 113A and the small diameter portion 113B are arranged coaxially with the pipe axis O1. An insertion guide portion (continuous reduced inner diameter surface) 113G is formed on the inner circumferential surface of the large diameter portion 113A. With this configuration, an insertion guide portion (continuously contracting inner diameter surface) 113G is formed on the inner circumferential surface of the large-diameter portion 113A that forms the upper end of the outer cylindrical portion 11. Therefore, when attaching the inner cylindrical portion 122 of the upper drain member 320 to the outer cylindrical portion 112 of the lower drain member 110, the inner cylindrical portion 122 of the upper drain member 320 can be guided downward along the insertion guide portion (continuously contracting inner diameter surface) 113G of the large-diameter portion 113A, allowing the inner cylindrical portion 21 to be inserted into the inside of the outer cylindrical portion 11.

[0053] The internal threaded portion 115 is formed on the inner surface of the outer cylinder portion 112. Furthermore, the internal circumferential thread portion 115 can be of various known shapes. Specifically, it may be formed with gaps in the circumferential direction or continuously in the circumferential direction.

[0054] As shown in Figures 7A and 7B, the upper drain member 120 includes, for example, an upper flange portion 121 positioned on the upper surface 11A of the bottom plate 11 and having a drain opening portion 121H formed on its inner circumference, an inner cylinder portion 122 formed below the upper flange portion 121 and extending downward, an inner cylinder diameter reduction portion 123 connecting the upper flange portion 121 and the upper end of the inner cylinder portion 122 and decreasing in diameter as it extends downward, and an outer circumference threaded portion 125 formed on the outer circumference of the inner cylinder portion 122. Then, the inner cylinder portion 122 of the upper drain member 120 is inserted into the outer cylinder portion 112 of the lower drain member 110, and the outer threaded portion 125 and the inner threaded portion 115 are screwed together to form the siphon drain member 100.

[0055] The upper flange portion 121 is formed, for example, with a circular outer shape in plan view, and a circular drain opening 121H is formed on the inner circumference in plan view. In other words, the upper flange portion 121 is formed in a ring-shaped flat plate form in plan view. The lower surface 121B of the upper flange portion 121 is positioned on the upper surface 11A of the bottom plate 11 of the gutter 10.

[0056] Furthermore, the lower surface 121B of the upper flange portion 121 has, for example, a flat surface on its outer circumference, and a stepped portion 126 (alignment portion) consisting of a cylindrical portion projecting downward along the axis O2 on the inner circumference of the flat surface. Here, "partially formed" means, for example, that the stepped portion 126 is provided over less than half of the circumferential length of the lower surface 121B of the upper flange portion 121. For example, in this embodiment, as shown in Figure 7E, four stepped portions 126 are provided at equal intervals in the circumferential direction on the lower surface 121B of the upper flange portion 121. In this embodiment, the stepped portions 126 can also be described as protrusions provided on the outer circumferential surface of the inner cylinder reduced diameter portion 123. In areas where the stepped portions 126 are not provided, the lower surface 121B of the upper flange portion 121 and the outer circumferential surface of the inner cylinder reduced diameter portion 123 are smoothly connected without any steps. The spacing of the stepped portions 126 is not limited to equal intervals, but equal intervals are preferable because they make it less likely for the lower drain 110 to be misaligned relative to the pilot hole 11H. The number of stepped portions 126 is not limited and may be, for example, one, two, three, five, six or more, but from the viewpoint of stable positioning, it is preferable to provide multiple stepped portions in the circumferential direction. From the viewpoint of simplifying the mold structure during molding, it is preferable that the number of stepped portions 126 be even. Furthermore, the circumferential length of each step portion 126 is not limited; the circumferential lengths of multiple step portions 126 may all be the same, or the circumferential lengths of some or all of the step portions 126 may be different. Furthermore, if there is only one stepped portion 126, it may be provided over half the circumferential length of the lower surface 121B of the upper flange portion 121. If there is only one stepped portion 126, and it is less than half the circumferential length of the lower surface 121B of the upper flange portion 121, the lower drain 110 will be misaligned in the circumferential direction relative to the pilot hole 11H. For this reason, it is more preferable that the stepped portion 126 be provided over half the length.

[0057] As shown in Figure 7E, it is preferable that the stepped portion 126 is provided straddling the parting line PL, or at a position 90 degrees away from the parting line PL in the circumferential direction. The position 90 degrees away from the parting line PL in the circumferential direction may be, for example, a position where the stepped portion 126 is provided straddling a second virtual line L2 that is perpendicular to a first virtual line L1 passing through the parting line PL when the upper drain member 120 is viewed from the direction of axis O2. This configuration allows for the creation of a drain member 100 with a simple mold structure.

[0058] Furthermore, the stepped portion 126 contacts the inner circumferential surface of the pilot hole 11H of the gutter 10, allowing the upper drain member 120 to be positioned relative to the pilot hole 11H. Thus, the stepped portion 126 only needs to contact the inner circumferential surface of the pilot hole 11H during positioning. Therefore, for example, after the completion of construction, the stepped portion 126 does not need to be in constant contact with the inner circumferential surface of the pilot hole 11H of the gutter 10. Also, when inserting the upper drain member 120 into the pilot hole 11H at an angle during construction, for example, if the stepped portion 126 is partially provided on the lower surface 121B of the upper flange portion 121, the stepped portion 126 is less likely to contact the inner circumferential surface of the pilot hole 11H. Therefore, during construction, it is possible to prevent the stepped portion 126 from contacting and getting stuck on the inner circumferential surface of the pilot hole 11H before positioning, which would make construction difficult. Furthermore, the upper surface 121A of the upper flange portion 121 is composed of a gently curved section, as shown in Figure 3.

[0059] The inner cylinder portion 122 is formed in a cylindrical shape that can be inserted into the outer cylinder portion 112, for example, with the pipe axis O2 as its center, and extends in the vertical direction when attached to the gutter 10. Furthermore, an inner circumferential hole 122H is formed inside the inner cylinder portion 122, which penetrates vertically. Furthermore, an outer threaded portion 125 is formed on the outer circumferential surface of the inner cylinder portion 122.

[0060] As shown in Figures 7A and 7B, the inner cylinder reduced diameter portion 123 connects the upper flange portion 121 and the upper end of the inner cylinder portion 122 by decreasing in diameter as it extends downward. In this embodiment, the upper surface 123A of the inner cylinder diameter reduction portion 123 constitutes the flow path surface from the outlet 121H in the siphon portion 150 described above to the inner circumferential hole 122H of the inner cylinder.

[0061] Furthermore, in this embodiment, the outer circumferential surface of the inner cylinder diameter reduction portion 123 is a continuous diameter reduction outer circumferential surface that continuously reduces in diameter up to the outer circumferential surface of the inner cylinder portion 122. Specifically, the outer circumferential surface of the inner cylinder diameter reduction portion 123 is formed in a smooth shape by a gentle curve that is recessed toward the inner circumference up to the upper end of the inner cylinder portion 122 in a cross-section including the pipe axis O1. In other words, no steps are formed on the outer circumferential surface of the inner cylinder diameter reduction portion. Note that the inner cylinder diameter reduction portion may be formed by a straight line or a line that combines a straight line and a curve. Also, it is possible to arbitrarily set whether or not to form a continuous diameter reduction outer circumferential surface on the outer circumferential surface of the inner cylinder diameter reduction portion, and a configuration without a continuous diameter reduction outer circumferential surface is also possible.

[0062] The outer threaded portion 125 is formed on the outer surface of the inner cylinder portion 122. The outer circumferential thread portion 125 can be of various known shapes that can be screwed into the inner circumferential thread portion 115. For example, it may be formed with gaps in the circumferential direction or continuously in the circumferential direction. Furthermore, it is preferable that the outer circumferential thread portion 125 is a multi-start thread. The number of starts in the multi-start thread is not limited, but for example, it may be 2, 3, or 4 starts. If the outer circumferential thread portion 125 is a multi-start thread, a high fitting force can be obtained with a small thread length, and the number of rotations required when fitting the upper drain member 120 and the lower drain member 110 can be reduced, thereby improving workability. As shown in Figure 6, it is preferable that the upper end portion 125A of the outer peripheral thread portion 125 is located on the parting line PL. If the outer peripheral thread portion 125 is a multi-start thread and there are multiple upper end portions 125A of the outer peripheral thread portion 125, it is preferable that one of the upper end portions 125A is located on the parting line PL.

[0063] Furthermore, it is preferable that the positional relationship between the aforementioned stepped portion (alignment portion) 126 and the upper end portion 125A of the outer peripheral thread portion 125 is such that at least one stepped portion 126 straddles the position of the upper end portion 125A of the outer peripheral thread portion 125 in a plan view, or that the upper end portion 125A of the outer peripheral thread portion 125 and the side surface 126A of the stepped portion 126 are at the same position.

[0064] Next, with reference to Figure 7C, the upper surface 123A of the inner cylinder reduced diameter portion 123, which forms the flow path surface of the siphon portion 150, will be described. The reference numeral P1 in Figure 7 indicates the lower end of the outer cylinder reduced diameter portion 113. The radius of curvature R of the upper surface 123A of the inner cylinder reduced diameter portion 123 is preferably formed to be as large as possible, taking into consideration, for example, the diameter D0 of the pilot hole 11H, the diameter D1 of the upper end of the inner circumference of the outer cylinder reduced diameter portion 113, the diameter D2 of the drop-off opening 121H, and the height dimension L11 to the lower end P1 of the outer cylinder reduced diameter portion 113, as shown in Figure 7C. In other words, in order to avoid interference between the outer circumferential surface of the inner cylinder reduced diameter portion 123 and the upper end of the inner circumference of the outer cylinder reduced diameter portion 113, it is preferable to either reduce the curvature of the outer cylinder reduced diameter portion 113, i.e., the upper surface 123A, or to set the diameter D1 of the outer cylinder reduced diameter portion 113 to be large.

[0065] Specifically, for example, if the joint (elbow, etc.) or downpipe connected to the lower drain member 110 has a nominal diameter of 75, it is preferable to set the radius of curvature R to 10 mm or more and 30 mm or less. Furthermore, for example, in the case of a nominal diameter of 100, it is preferable to set the radius of curvature R to be between 12 mm and 40 mm, and in the case of a nominal diameter of 125, it is preferable to set the radius of curvature R to be between 13 mm and 50 mm.

[0066] Next, the procedure for attaching the drain member 100 described above to the gutter 10 will be explained. First, a pilot hole (through hole) 11H for attaching the drain member 100 is formed in the bottom wall 11 of the gutter 10. Next, for example, the upper drain member 120 is inserted into the gutter 10, the inner cylinder portion 122 is inserted into the pilot hole 11H of the gutter 10 and made to protrude downward, and the stepped portion 126 of the upper flange portion 121 is inserted into the pilot hole 11H of the bottom plate 11 of the gutter 10 and fixed in place. For example, adhesive or a gasket is attached to the lower surface 121B of the upper flange portion 121. Next, the inner cylindrical portion 122 of the upper drain member 120 is inserted into the lower drain member 110, and the outer threaded portion 125 and the inner threaded portion 115 are screwed together. Once screwed in to the predetermined position, an installation tool (not shown) is inserted into the tool mounting recess (recess) 118 and rotated to tighten it to the predetermined position, thereby fixing the drain member 100 in place. The order in which the upper drain member 120 and the lower drain member 110 are installed is not limited to the above; the lower drain member 110 may be installed first and then fitted with the upper drain member 120.

[0067] According to the drain member 100 of the first embodiment, since an insertion guide portion (continuous reduced inner diameter surface) 113G is formed on the inner circumferential surface of the outer diameter reduced portion 113 of the lower drain member 110, the inner cylinder portion 122 of the upper drain member 120 is guided to the inside of the outer cylinder portion 112 without getting caught on the inner circumferential surface of the outer diameter reduced portion 113. As a result, the inner cylindrical portion 122 of the upper drain member 120 can be smoothly inserted into the outer cylindrical portion 112 of the lower drain member 110.

[0068] According to the drain member 100 of the first embodiment, a stepped portion 126 (alignment portion) is partially formed on the lower surface 121B of the upper flange portion 121, so that the siphon drain member 100 can be accurately and efficiently attached to the gutter 10. Furthermore, the stepped portion 126 is partially provided on the lower surface 121B of the upper flange portion 121. Therefore, even if a part of the pilot hole 11H has a processing defect (edge, burr, etc.), the upper drain member 120 can be positioned relative to the pilot hole 11H by avoiding such processing defects and bringing the stepped portion 126 into contact with the inner circumferential surface of the pilot hole 11H. Thus, the drain member 100 can be made easy to install.

[0069] <Second Embodiment> A second embodiment of the present invention will be described below with reference to Figures 8A and 8B. Figure 8A is a longitudinal cross-sectional view showing the assembled state illustrating the schematic configuration of the drain member according to the second embodiment, and Figure 8B is a longitudinal cross-sectional view showing the disassembled state. Note that Figures 8A and 8B are simplified diagrams of the drain member with the siphon section omitted. In Figures 8A and 8B, reference numeral 300 indicates a drain member (drain member).

[0070] As shown in Figures 8A and 8B, the drain member 300 includes, for example, a lower drain member 310, an upper drain member 220, and a siphon section (not shown) positioned above the upper drain member 220. In other words, the drain member 300 is configured by combining a lower drain member 310, which has an insertion guide portion (continuously contracted inner diameter surface) 113G and an inner circumferential thread portion 115 formed at a distance from the upper end portion 112U of the outer cylinder portion 112L, with an upper drain member 220. Here, the upper end portion 112U of the outer cylinder portion 112L refers to the boundary portion between the outer cylinder portion 112L and the insertion guide portion 113G (continuously contracted inner diameter surface). The upper drain member 220 is the same as in the first embodiment, so the same reference numerals are used and its description is omitted.

[0071] As shown in Figures 8A and 8B, the lower drain member 310 includes, for example, a lower flange portion 111 positioned on the lower surface 11B of the gutter 10, an outer cylinder portion 112L formed below the lower flange portion 111 and extending downward, an outer cylinder diameter reduction portion 113 connecting the lower flange portion 111 and the outer cylinder portion 112L, and an inner circumferential thread portion 115 formed on the inner circumferential surface of the outer cylinder portion 112L and spaced apart from the upper end portion 112U of the outer cylinder portion 112L. The lower drain member 310 also includes an insertion guide portion (continuous diameter reduction surface) 113G formed on the inner circumferential surface of the outer cylinder diameter reduction portion 113. The lower drain member 310 differs from the lower drain member 110 according to the first embodiment in that the inner circumferential thread portion 115 is formed at a distance from the upper end portion 112U of the outer cylinder portion 112L. Other aspects are the same as in the first embodiment, so the same reference numerals are used and their description is omitted.

[0072] Furthermore, the length L21 between the inner circumferential thread portion 115 and the upper end portion 112U of the outer cylinder portion 112L can be set arbitrarily, but for example, it is preferable to set the length L21 to be longer than the height dimension L16 of the outer cylinder reduced diameter portion 113, which starts from the upper surface 111A of the lower flange portion 111 shown in Figure 9A. By setting L21 > L16, the inner cylinder portion 122 of the upper drain member 120 can be smoothly inserted into the outer cylinder portion 112.

[0073] According to the drain member 300 of the second embodiment, the lower drain member 310 is equipped with an insertion guide portion (continuous reduced inner diameter surface) 113G and the inner circumferential thread portion 115 is formed at a distance from the upper end portion 112U of the outer cylinder portion 112L. Therefore, the lower drain member 310 and the upper drain member 220 can be assembled efficiently and stably while suppressing oblique fitting. Specifically, when installing the upper drain member 220 and the lower drain member 310, even if they are inserted at an angle, the distance between the inner cylinder portion 122 having the outer circumferential thread portion 125 of the upper drain member 220 and the upper end portion 112U of the outer cylinder portion 112L allows the pipe axis O1 of the upper drain member 220 and the pipe axis O2 of the lower drain member 310 to become coaxial before the tip of the inner cylinder portion 122 having the outer circumferential thread portion 125 of the upper drain member 220 contacts the inner circumferential thread portion 115 of the lower drain member 310, and then the thread portion can be screwed in. Therefore, it is possible to prevent the screw from being fitted at an angle. Furthermore, it is preferable that the outer threaded portion 125 of the upper drain member 220 extends to the lower end of the inner cylinder portion 122. If the outer threaded portion 125 of the upper drain member 220 extends to the lower end of the inner cylinder portion 122, the length of the drain member 300 in the height direction can be reduced when the upper drain member 220 is combined with the lower drain member 310. As a result, the drain member 300 can be made more compact and aesthetically pleasing.

[0074] <Third Embodiment> A third embodiment of the present invention will be described below with reference to Figures 9A to 9C. Figure 9A is a longitudinal cross-sectional view showing the assembled state illustrating the schematic configuration of the drain member according to the third embodiment, and Figure 10B is a longitudinal cross-sectional view showing the disassembled state. Figure 10C is a longitudinal cross-sectional view illustrating the schematic configuration of the bent portion formed in the upper drain member. Note that Figures 9A and 9B are simplified diagrams of the drain member with the siphon portion omitted.

[0075] In Figures 9A and 9B, reference numeral 400 indicates the drain member, reference numeral 320 indicates the upper drain member, reference numeral 321 indicates the upper flange portion, and reference numeral 321E indicates the bent portion (alignment portion).

[0076] As shown in Figures 9A and 9B, the (drain member) 400 includes, for example, a lower drain member 110, an upper drain member 320, and a siphon section (not shown) positioned above the upper drain member 320. The lower drain member 110 is the same as in the first embodiment, so the same reference numerals are used and its description is omitted.

[0077] As shown in Figures 9A and 9B, the upper drain member 320 includes, for example, an upper flange portion 321 positioned on the upper surface 11A of the bottom plate 11 and having a drain opening portion 121H formed on its inner circumference, an inner cylinder portion 122 formed below the upper flange portion 321 and extending downward, an inner cylinder diameter reduction portion 123 connecting the upper flange portion 121 and the upper end of the inner cylinder portion 122 and decreasing in diameter as it extends downward, and an outer circumference threaded portion 125 formed on the outer circumference of the inner cylinder portion 122.

[0078] Furthermore, the upper drain member 320 is provided with a bent portion 321E (alignment portion) partially located on the lower surface 321B of the upper flange portion 321. Here, "partially formed" means, for example, that the bent portion 321E is provided over less than half of the circumferential length of the lower surface 121B of the upper flange portion 121. For example, in this embodiment, as shown in Figure 9E, four bent portions 321E are provided at equal intervals in the circumferential direction on the lower surface 121B of the upper flange portion 121. In this embodiment, the bent portions 321E can also be described as ridges provided at the boundary between the upper flange portion 121 and the inner cylinder reduced diameter portion 123. In areas where no bent portions 321E are provided, the lower surface 121B of the upper flange portion 121 and the outer circumferential surface of the inner cylinder reduced diameter portion 123 are smoothly connected without the need for ridges. The spacing of the bent portions 321E is not limited to equal intervals, but equal intervals are preferable because they make it less likely for the lower drain 110 to be misaligned relative to the pilot hole 11H. The number of bent portions 321E is not limited and may be, for example, one, two, three, five, six or more, but from the viewpoint of stable positioning, it is preferable to provide multiple bent portions in the circumferential direction. From the viewpoint of simplifying the mold structure during molding, it is preferable that the number of bent portions 321E be even. Furthermore, the circumferential length of each bent portion 321E is not limited; the circumferential lengths of multiple bent portions 321E may all be the same, or the circumferential lengths of some or all of the bent portions 321E may be different. Furthermore, if there is only one bent portion 321E, it may be provided over half the circumferential length of the lower surface 121B of the upper flange portion 121. If there is only one bent portion 321E, and it is less than half the circumferential length of the lower surface 121B of the upper flange portion 121, the lower drain 110 will be misaligned in the circumferential direction relative to the pilot hole 11H. For this reason, it is more preferable that the bent portion 321E be provided over half the length.

[0079] As shown in Figure 9E, it is preferable that the bent portion 321E is provided straddling the parting line PL, or at a position 90 degrees away from the parting line PL in the circumferential direction. The position 90 degrees away from the parting line PL in the circumferential direction may be, for example, a position where the upper drain member 320 is provided straddling a second virtual line L2 that is perpendicular to a first virtual line L1 passing through the parting line PL when viewed from the direction of axis O2. With such a configuration, the drain member 400 can be obtained with a simple mold structure.

[0080] As shown in Figure 9C, the bent portion 321E is formed, for example, at a position corresponding to the periphery of the pilot hole 11H formed in the bottom plate 11 of the gutter 10 on the lower side surface 321B of the upper flange portion 321. Specifically, it is formed at a position corresponding to the upper corner portion 11E of the bottom plate 11 at the periphery of the pilot hole 11H. If the shape of the pilot hole 11H is circular, the bent portion 321E is formed at a position along a circle with a diameter approximately the same as or slightly smaller than that of the pilot hole 11H. The bent portion 321E is preferably located at the same position as the upper corner portion 11E of the base plate 11, but it may also be located near the periphery of the pilot hole 11H, where the flat surface on the outer circumference is stably positioned on the upper surface of the base plate with adhesive or the like sandwiched in between.

[0081] Furthermore, the bent portion 321E is formed by the bending of the boundary between the flat lower surface (flat surface) 321B of the upper flange portion 321, which is located on the outer circumference side of the pilot hole 11H in a cross-section including the pipe axis O2, and the protruding outer surface (protruding surface) 323B of the inner cylinder reduced diameter portion 323, which is located on the inner circumference side and protrudes downward. In other words, the bent portion 321E is formed at the connection point between the lower surface (flat surface) 321B of the upper flange portion 321 and the protruding outer surface (protruding surface) 323B of the inner cylinder reduced diameter portion 323. Furthermore, the bent portion 321E is partially formed in the circumferential direction around the pilot hole 11H.

[0082] Here, the bent portion 321E refers to a recess that opens at an angle greater than 90° where the lower intersection angle of the flat surface and the protruding surface (or the tangential direction at the boundary if the protruding surface is curved) is greater than 90°. The lower intersection angle is preferably 120° or greater, and more preferably 150° or greater. Furthermore, in order to stably engage with the upper corner of the pilot hole 11H, the intersection angle is preferably 160° or less.

[0083] Furthermore, the bent portion 321E catches on the upper corner portion 11E formed on the upper surface 11A of the peripheral edge of the pilot hole 11H formed in the bottom plate 11, thereby suppressing misalignment of the upper drain member 320 relative to the pilot hole 11H and enabling the positioning of the upper drain member 320. In addition, the bent portion 321E is partially provided on the outer circumferential surface of the upper flange portion 121. Therefore, even if a part of the pilot hole 11H has a processing defect (edge, burr, etc.), the upper drain member 120 can be positioned relative to the pilot hole 11H by avoiding such processing defects and bringing the bent portion 321E into contact with the inner circumferential surface of the pilot hole 11H. Thus, a drain member 400 with excellent workability can be obtained.

[0084] Furthermore, according to the drain member 400 of the third embodiment, since the upper drain member 320 is equipped with a bent portion 321E, a stepped portion 126 based on the inner circumferential surface (inner circumferential wall surface) of the pilot hole 11H is not required. As a result, the adhesive applied to the lower surface 121B of the upper flange 121 drips down along the curved surface of the protruding outer circumferential surface (protruding surface) 323B, preventing it from dripping onto the inner circumferential surface of the pilot hole 11H or the lower surface of the bottom plate 11. As a result, the drain member 400 can be positioned in relation to the pilot hole 11H with high quality and stability.

[0085] Furthermore, with respect to the drain member 400, since the lower drain member 110 is equipped with an insertion guide portion (continuous reduced inner diameter surface) 113G, the inner cylinder portion 122 of the upper drain member 320 can be smoothly inserted into the outer cylinder portion 112 of the lower drain member 110.

[0086] Furthermore, as shown in Figure 9D, for example, the outer cylinder diameter reduction portion 113 may have a stepped portion. Specifically, the outer cylinder diameter reduction portion 113 comprises a large diameter portion 113A that forms the upper end of the outer cylinder diameter reduction portion 113 and decreases in diameter from the upper end downwards, and a small diameter portion 113B that is connected to the lower end of the large diameter portion 113A and has a smaller diameter than the large diameter portion 113A. The large diameter portion 113A and the small diameter portion 113B are arranged coaxially with the pipe axis O1. An insertion guide portion (continuous reduced inner diameter surface) 113G is formed on the inner circumferential surface of the large diameter portion 113A. With this configuration, an insertion guide portion (continuously contracting inner diameter surface) 113G is formed on the inner circumferential surface of the large-diameter portion 113A that forms the upper end of the outer cylindrical portion 11. Therefore, when attaching the inner cylindrical portion 122 of the upper drain member 320 to the outer cylindrical portion 112 of the lower drain member 110, the inner cylindrical portion 122 of the upper drain member 320 can be guided downward along the insertion guide portion (continuously contracting inner diameter surface) 113G of the large-diameter portion 113A, allowing the inner cylindrical portion 21 to be inserted into the inside of the outer cylindrical portion 11.

[0087] <Fourth Embodiment> A fourth embodiment of the present invention will be described below with reference to Figures 10A and 10B. Figure 10A is a longitudinal cross-sectional view showing the assembled state illustrating the schematic configuration of the drain member according to the fourth embodiment, and Figure 10B is a longitudinal cross-sectional view showing the disassembled state. Note that Figures 10A and 10B are simplified diagrams with the siphon section omitted. In Figures 10A and 10B, reference numeral 500 indicates the drain member (drain member), and reference numeral 420 indicates the upper drain member.

[0088] As shown in Figures 10A and 10B, the drain member (drain member) 500 includes, for example, a lower drain member 310, an upper drain member 420, and a siphon section (not shown) positioned above the upper drain member 420. The upper drain member 420 is the same as in the second embodiment, so the same reference numerals are used and its description is omitted.

[0089] As shown in Figures 11A and 11B, the upper drain member 420 includes, for example, an upper flange portion 321 positioned on the upper surface 11A of the gutter 10 and having a drain outlet portion 121H formed on its inner circumference; an inner cylinder portion 122 formed below the upper flange portion 321 and extending downward, with an outer circumference threaded portion 125 formed on its outer circumference; and an inner cylinder reduced diameter portion 123 connecting the upper flange portion 121 and the upper end of the inner cylinder portion 122, which is reduced in diameter as it extends downward. Furthermore, as shown in Figure 9E, the upper drain member 420 is provided with stepped portions 126 partially positioned on the lower surface 321B of the upper flange portion 321. The number and arrangement of the stepped portions 126 are as described above, so no further explanation is provided.

[0090] The lower drain member 310 differs from the lower drain member 110 in that the inner circumferential thread portion 115 is formed at a distance from the upper end portion 112U of the outer cylinder portion 112L. Other aspects are the same as in the third embodiment, so the same reference numerals are used and their description is omitted.

[0091] According to the drain member (drain member) 500 of the fourth embodiment, the lower drain member 310 is provided with an insertion guide portion (continuous reduced inner diameter surface) 113G and the inner circumferential thread portion 115 is formed at a distance from the upper end portion 112U of the outer cylinder portion 112L, so that the lower drain member 310 and the upper drain member 420 can be assembled efficiently and stably while suppressing oblique fitting. Specifically, when installing the upper drain member 420 and the lower drain member 310, even if they are inserted at an angle, the gap between the inner cylinder portion 122 of the upper drain member 420, which has an outer threaded portion 125, and the upper end portion 112U of the outer cylinder portion 112L allows the pipe axis O1 of the upper drain member 420 and the pipe axis O2 of the lower drain member 310 to become coaxial before the tip of the inner cylinder portion 122 of the upper drain member 420, which has an outer threaded portion 125, comes into contact with the inner threaded portion 115 of the lower drain member 310, and then the threaded portion can be screwed in. Therefore, it is possible to prevent the threads from being fitted at an angle. Furthermore, it is preferable that the outer threaded portion 125 of the upper drain member 420 extends to the lower end of the inner cylinder portion 122. If the outer threaded portion 125 of the upper drain member 420 extends to the lower end of the inner cylinder portion 122, the length of the drain member 500 in the height direction can be reduced when the upper drain member 420 is combined with the lower drain member 310. As a result, the drain member 500 can be made more compact and aesthetically pleasing.

[0092] Furthermore, with respect to the drain member 500, since the upper drain member 420 is equipped with a bent portion 321E, the drain member 500 can be positioned with high quality and stability relative to the pilot hole 11H.

[0093] Furthermore, when installed, the screws (internal threaded portion 115 and external threaded portion 125) engage at a position close to the bottom plate 11 of the rain gutter, thereby increasing the engagement force between the upper drain members 120, 320, and 420 and the lower drain members 110, 210, and 310. On the other hand, as explained in the second and fourth embodiments, when the screws (internal threaded portion 115 and external threaded portion 125) engage at a position close to the bottom plate 11 of the rain gutter, the risk of oblique engagement between the upper drain members 120, 320, and 420 and the lower drain members 110, 210, and 310 increases. From the viewpoint of achieving both the mating force between the upper drain members 120, 320, and 420 and the lower drain member, and the suppression of oblique mating, it is preferable that the relationships between the various lengths of the structures of the upper drain members 120, 320, and 420 and the lower drain members 110, 210, and 310 be set as follows, for example, as shown in Figure 8B.

[0094] The length L41 of the inner cylinder portion of the upper drain members 120, 320, and 420, from the upper end of the inner cylinder portion 122 to the upper end of the outer threaded portion 125, is preferably 10 to 20 mm. The outer diameter L42 of the inner cylinder portion 122 is preferably 75 to 135 mm. The inner diameter L43 of the outer cylinder portion 112L is preferably 80 to 140 mm. The length L44 of the outer threaded portion 125 and the inner threaded portion 115 is preferably 20 to 40 mm. Note that the length of the outer threaded portion 125 and the length of the inner threaded portion 115 are not limited to being the same, and different lengths may be used. The length L45 of the outer cylinder portion 112L is preferably 25 mm to 80 mm. The length L45 of the outer cylinder portion 112L is more preferably 40 to 65 mm.

[0095] Furthermore, a shorter length of the inner circumferential thread portion 115 is preferable, as this reduces the number of times the upper drain members 120, 320, and 420 need to be rotated during installation, making installation easier. Therefore, the length of the inner circumferential thread portion 115 may be shorter than the length of the outer cylinder portion 112L. In this case, from the viewpoint of ensuring the engagement force between the upper drain members 120, 320, and 420 and the lower drain members 110, 210, and 310, it is preferable that the outer cylinder portion 112L extends below the lower end of the inner circumferential thread portion 115. The statement that the outer cylinder portion 112L extends below the lower end of the inner circumferential thread portion means that the lower end of the inner circumferential thread portion 115 and the lower end 112T of the lower drain member are spaced apart.

[0096] As described above, the drain member of this disclosure has a bottom plate 11 and side plates extending upward from both ends in the width direction of the bottom plate 11, and is a drain member that is attached to a gutter in which a pilot hole 11H is formed in the bottom plate 11, and includes a lower flange portion 111 disposed on the lower surface of the bottom plate 11 and having a receiving opening formed on its inner circumference, an outer cylinder portion 112L formed below the lower flange portion 111 and extending downward, an outer cylinder diameter reduction portion 113 connecting the upper end of the lower flange portion 111 and the outer cylinder portion 112L and decreasing in diameter as it goes downward, and an inner circumference screw portion 115 formed on the inner circumference surface of the outer cylinder portion 112L, and the lower drain member 110, 210, 310, which has an inner flange portion 111 disposed on the upper surface of the bottom plate 11 The upper drain members 120, 320, and 420 each have upper flange portions 121 and 321 with a drain opening 121H formed on their inner circumference, an inner cylinder portion 122 formed below the upper flange portions and extending downward and inserted into the outer cylinder portion 112L, an inner cylinder diameter reduction portion 123 that connects the upper flange portions 121 and 321 to the upper ends of the inner cylinder portion 122 and decreases in diameter as it extends downward, and an outer thread portion 125 formed on the outer circumference surface of the inner cylinder portion 122 and screwed into the inner thread portion 115. The upper drain members 120, 320, and 420 each have alignment portions that are partially positioned on the lower surface of the upper flange portions 121 and 321 at a location corresponding to the periphery of the pilot hole 11H. With this configuration, the alignment parts partially provided on the outer circumferential surfaces of the upper flange portions 121 and 321 come into contact with the inner circumferential surface of the pilot hole 11H of the eaves gutter, thereby positioning the upper drain member relative to the pilot hole 11H. However, since the pilot hole 11H of the eaves gutter is drilled manually, it may not always be a perfectly circular shape, and processing defects such as edges or burrs may be formed on the inner circumferential surface. For example, if the alignment parts are formed continuously on the outer circumferential surfaces of the upper flange portions 121 and 321, the alignment parts may catch on such processing defects, preventing the upper drain members 120, 320, and 420 from being fitted into the pilot hole 11H, resulting in a faulty installation. In such cases of faulty installation, it may be necessary to readjust the size and precision of the pilot hole 11H. As disclosed herein, if the alignment portion is partially provided on the outer circumferential surface of the upper flange portions 121 and 321, even if a part of the pilot hole 11H has a manufacturing defect, the upper drain member can be positioned relative to the pilot hole 11H by avoiding such a manufacturing defect and bringing the alignment portion into contact with the inner circumferential surface of the pilot hole 11H. Therefore, a drain member with excellent workability can be obtained.

[0097] The alignment portion may also be the bent portion 321E. With this configuration, the upper flange portion 321 has a partially bent portion 321E on its outer circumferential surface. Therefore, a stepped portion is not required to be inserted into the inner circumferential surface (inner wall surface) of the pilot hole 11H and to be positioned relative to the inner circumferential surface (inner wall surface), so the stepped portion or the like does not come into direct contact with the inner circumferential surface of the pilot hole 11H. In addition, the adhesive applied to the lower surface of the upper flange 321 is prevented from dripping into the inside of the pilot hole 11H or through the pilot hole 11H to the inner circumferential surface of the pilot hole 11H or the lower surface of the bottom plate 11. As a result, the drain member 300 can be positioned with high quality and stability relative to the pilot hole 11H. Therefore, the drain member 300 can be made easy to install.

[0098] The alignment portion may also be a stepped portion 126. With this configuration, the upper flange portion 121 has a stepped portion 126 partially provided on its outer circumferential surface. Therefore, the stepped portion 126 partially provided on the outer circumferential surface of the upper flange portion 121 comes into contact with the inner circumferential surface of the pilot hole 11H of the gutter, allowing the upper drain member 120 to be positioned relative to the pilot hole 11H. As a result, the drain member 100 can be positioned accurately and efficiently relative to the pilot hole 11H. Thus, a drain member 100 with excellent workability can be obtained.

[0099] Alignment portions may be formed at equal intervals in the circumferential direction at the boundary between the flat surface on the outer circumference and the protruding surface on the inner circumference that protrudes downward. With this configuration, alignment sections are formed at equal intervals on the outer circumferential surface of the upper flange sections 121 and 321. This makes it easy to align, for example, the center of the pilot hole 11H with the central axis of the upper drain members 120, 320, and 420, allowing the upper drain members 120, 320, and 420 to be stably positioned relative to the pilot hole 11H. Therefore, the drain members 100, 300, and 400 can be made with excellent workability.

[0100] The alignment portion may be provided across the parting line PL, or at a position 90 degrees away from the parting line PL in the circumferential direction. If the alignment portion is provided across the parting line PL, or at a position 90 degrees circumferentially away from the parting line, the alignment portion will not be an obstacle to the mold structure when molding the drain members 100, 300, and 400, and the drain members 100, 300, and 400 can be molded using only the slide core, for example. Therefore, the mold structure can be simplified.

[0101] At least one alignment portion may be formed such that, in a plan view, it straddles the position of the upper end 125A of the outer peripheral thread portion 125 of the upper drain members 120, 320, and 420, or the upper end 125A of the outer peripheral thread portion 125 and the end 126A of the alignment portion are in the same position. At least one alignment portion spans the position of the upper end 125A of the outer peripheral thread portion 125 of the upper drain members 120, 320, and 420 in a plan view. Therefore, for example, when the upper end 125A of the outer peripheral thread portion is positioned on the split surface of the mold, the alignment portion does not become an obstacle to the mold structure when molding the drain, and molding can be done with only the slide core, thus simplifying the mold structure. Furthermore, for example, when the upper end 125A of the outer peripheral thread portion 125 is positioned on the split surface of the mold, if the upper end 125A of the outer peripheral thread portion 125 and the end 126A of the alignment portion are formed to be at the same position, in addition to the above effects, the end 126A of the alignment portion is positioned on the split surface of the mold, thus suppressing defects during molding.

[0102] In the lower drain member 310, the inner circumferential thread portion 115 may be formed at a distance from the upper end portion 112U of the outer cylindrical portion 112L. In the lower drain member 310, the inner circumferential thread portion 115 is formed at a distance from the upper end portion 112U of the outer cylinder portion 112L. Therefore, when assembling the upper drain members 220 and 420 to the lower drain member 310, the upper drain members 220 and 420 can be aligned coaxially with the lower drain member 310 before the thread portion can be screwed in. This prevents the upper drain members 220 and 420 from being fitted to the lower drain member 310 at an angle. Thus, the drain members 300 and 500 can be made easier to install.

[0103] The rain gutter piping structure 1 may include a gutter 10, a drain member 100, a joint 20, and a downpipe 30. With this configuration, a rain gutter piping structure 1 with excellent workability can be achieved.

[0104] It should be noted that the present invention is not limited to the embodiments described above, and various modifications can be made without departing from the spirit of the invention.

[0105] For example, the shape of the siphon portion of the upper drain members 120, 320, and 420 is not limited to the above, and an upper drain member 620 having a siphon portion as shown in Figures 11A and 11B may be used. The upper drain member 620 includes vertical ribs 630 connected to multiple circumferential positions on the upper surface of the upper flange 616 and the inner surface of the upper reduced diameter portion 614, an upper inner cylinder 640 connected to the radially inner ends of the multiple vertical ribs 630, and a funnel portion 641 continuous with the upper end of the upper inner cylinder 640. In this case, as shown in Figure 12(a), a linear portion 631 may be formed on the vertical ribs 630 of the upper drain member 620. This linear portion 631 may also be a parting line PL. With such a configuration, even if the upper drain member 620 has a funnel portion 641, for example, the siphon portion can be molded by changing the mold's removal direction to vertical. Therefore, the mold can be made with a simple structure, resulting in a drain component with excellent manufacturability.

[0106] The shape of the funnel portion 641 and the shape of the longitudinal ribs 630 are not limited to those shown in Figures 11A and 11B. For example, as shown in Figures 12(b) and 12(d), the longitudinal ribs 630 do not have to be connected to the lower surface of the upper inner cylinder 640. For example, as shown in Figure 12(c), the longitudinal ribs 630 do not have to be formed up to the upper end of the funnel portion 641.

[0107] For example, in the above embodiment, the case in which the drain member is a siphon drain member 100 equipped with a siphon section 150 was described, but whether or not the drain member is equipped with a siphon section 150 can be arbitrarily set, and a configuration without a siphon section 150 is also possible. The same applies to the drain members 200, 300, 400, and 500. Furthermore, the combination of the lower drain members 110, 210, and 310 and the upper drain members 120, 220, and 320 exemplified in the above embodiment can be arbitrarily set.

[0108] Furthermore, in the above embodiment, the insertion guide portion was described as being composed of an insertion guide portion (continuous reduced inner diameter surface) 113G formed on the outer diameter reduced portion 113 of the lower drain member 110, and the inner circumferential thread portion 115 of the lower drain member 310 being formed at a distance from the upper end portion 112U of the outer cylinder portion 112L. However, the configuration of the insertion guide is not limited to the above and may be set arbitrarily.

[0109] Furthermore, in the above embodiment, the case in which the diameter-reduced portions 113 and 213 of the lower drain members 110, 210, and 310 are formed in a substantially conical shape in which the cross-section including the pipe axis O1 is reduced in diameter in a straight line has been described, but the configuration of the diameter-reduced portions 113 and 213 of the lower drain members can be arbitrarily set. For example, the cross-section including the pipe axis O1 may be reduced in diameter in a curved shape, or it may be configured as a slope combining a straight line and a curve. Also, a bulge may be formed in a range in which no snagging occurs in the inner cylinder portion 122.

[0110] The shapes of the outer thread portion 125 and the inner thread portion 115 are not particularly limited. For example, the outer thread portion 125 may have a thread height that decreases towards the bottom.

[0111] Furthermore, it is possible to replace the components in the above embodiments with well-known components as appropriate, without departing from the spirit of the present invention, and the above embodiments may also be applied in appropriate combinations. [Explanation of symbols]

[0112] 1. Rain gutter piping structure (piping structure) 10 Gutters 11 Bottom plate 11H pilot hole 11E Upper corner of pilot hole 12 Side panels 20 Elbow 30 Downpipe 100, 300, 400, 500 Drain components 110, 210, 310 Lower drain member 111 Lower flange section 111H Receiving hole 112, 112L outer cylinder 112H Outer cylinder inner circumference hole 113 Outer cylinder reduced diameter section 113G Insertion guide section (continuously contracted inner diameter surface) 115 Inner circumference thread 213 Outer cylinder diameter reduction inclined section 214 Stepped section (protruding section) 120, 320, 420 Upper drain member 121, 321 Upper flange section 121B, 321B Upper flange bottom surface 121H Outlet section 122 Inner cylinder 122H Inner cylinder inner circumferential hole 122G Guide Sleeve (Guide Tube Section, Insertion Guide Section) 123 Inner cylinder reduced diameter section 123D Step section 125 Outer circumference threaded section 126 Stepped section 321E Bend part 150 Siphon section

Claims

1. A drain member comprising an upper drain member and a lower drain member, The upper drain member has an upper flange portion with a drain opening formed on its inner circumference, An inner cylinder portion formed below the upper flange portion and extending downward, A funnel section positioned above the aforementioned outlet, It comprises a vertical rib provided in the inflow opening formed between the funnel portion and the upper flange portion, The inner surface of the connection between the inner cylinder portion and the upper flange portion is formed as a tapered or curved surface. The funnel portion comprises a rising portion extending in the vertical direction and a reduced diameter portion extending downward from the lower end of the rising portion. The aforementioned vertical ribs are formed in a plate-like shape that extends outward from the drop-off portion. The upper end of the vertical rib is at the same height as the upper end of the funnel portion, The aforementioned longitudinal ribs are not connected to the lower surface of the reduced diameter portion. Drain component.

2. A drain member comprising an upper drain member and a lower drain member, The upper drain member is, An upper flange portion with a drop-off opening formed on the inner circumference, An inner cylinder portion formed below the upper flange portion and extending downward, A funnel section positioned above the aforementioned outlet, It comprises a vertical rib provided in the inflow opening formed between the funnel portion and the upper flange portion, The inner surface of the connection between the inner cylinder portion and the upper flange portion is formed as a tapered or curved surface. The funnel portion comprises a rising portion extending in the vertical direction and a reduced diameter portion extending downward from the lower end of the rising portion. The aforementioned vertical ribs are formed in a plate-like shape that extends outward from the drop-off portion. The upper end of the longitudinal rib is lower than the upper end of the funnel portion. The longitudinal rib has a linear portion that is in contact with the reduced diameter portion. Drain component.

3. It comprises a cylindrical portion formed below the reduced diameter portion and extending downward, The aforementioned vertical ribs do not come into contact with the cylindrical portion. The inner end of the longitudinal rib formed on the pipe axis side of the upper drain member is inclined to be spaced away from the pipe axis. The drain member according to claim 1.

4. It comprises a cylindrical portion formed below the reduced diameter portion and extending downward, The longitudinal ribs are connected to the reduced diameter portion or the cylindrical portion. The drain member according to claim 2.

5. The lower end of the vertical rib is formed on the upper flange portion. The drain member according to claim 1 or 2.

6. The lower end of the vertical rib is formed at the connection portion. The drain member according to claim 1 or 2.

7. The longitudinal ribs are not connected to a surface in the inner cylinder that is connected to the inner surface of the connecting portion. The drain member according to claim 1 or 2.

8. A drain member according to claim 1 or 2, The gutter on which the drain member is installed, The system includes a downpipe connected to the downstream side of the drain member, Rain gutter piping structure.

9. A building provided with the rain gutter piping structure described in claim 8.

10. A drain member according to claim 1 or 2, The gutter on which the drain member is installed, A roof equipped with a roof.

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