Drain member, eaves gutter, rain gutter and building

Abstract

To provide a drain member that allows an inner cylinder of an upper drain member to be smoothly inserted into an outer cylinder of a lower drain member, a siphon drain member and a piping structure.SOLUTION: A siphon drain member 100 attached to a bottom plate of an eaves gutter comprises: an upper drain member 120 having an upper flange 121, an inner cylinder 122 formed below the upper flange 121, an inner cylinder reduced diameter portion 123 connecting the upper flange 121 and the inner cylinder 122, an outer circumference screw 125, a guide sleeve 122G, a bending recess 321E, a lid member, and a rib arranged on the lid member; and a lower drain member 110 having a lower flange 111, an outer cylinder 112 formed below the lower flange 111, an outer cylinder reduced diameter portion 113 connecting the lower flange 111 and the outer cylinder 112, a protrusion 214, and an insertion guide 113G for aligning respective tube axes O1 and O2.SELECTED DRAWING: Figure 10B

Description

[Technical field]

[0001] The present invention relates to a drain member that is attached to an eaves gutter and connects the eaves gutter to a downstream downspout or a joint. [Background technology]

[0002] As is well known, siphon drain members with high drainage capabilities are widely used, which are installed on the inside of large eaves gutters placed on the eaves of large facilities such as factories and shopping centers (see, for example, Patent Document 1).

[0003] Such siphon drain members generally comprise a drain member having a lower drain member that is placed on the underside across the bottom plate of the eaves gutter, and an upper drain member that is placed on the upper side and has a siphon portion formed on the upper part. Such a drain member having a lower drain member and an upper drain member is not limited to a siphon drain member and is used for various purposes.

[0004] 16A, the drain member 900 includes, for example, a lower drain member 910 arranged on the lower surface of the bottom plate (eaves gutter) 11 (10), and an upper drain member 920 arranged on the upper side of the eaves gutter 10. The siphon drain member includes, for example, a siphon portion 950 arranged on the upper portion of the upper drain member 920, as shown in FIG.

[0005] The lower drain member 910 has, for example, a lower flange portion 911 having a receiving port formed on its inner peripheral side, an outer tube portion 912 formed below the lower flange portion 911, and an outer tube reduced diameter portion 913 connecting the lower flange portion 911 and the outer tube portion 912, and an inner peripheral thread portion 915 is formed on the inner peripheral surface of the outer tube portion 912.

[0006] In addition, the upper drain member 920 has, for example, an upper flange portion 921 having a drop portion formed on its inner peripheral side, an inner tube portion 922 formed below the upper flange portion 921, and an inner tube reduced diameter portion 923 connecting the upper flange portion 921 and the inner tube portion 922, and an outer peripheral thread portion 925 is formed on the outer peripheral surface of the inner tube portion 922.

[0007] The lower drain member 910 is placed on the underside of the bottom plate 11 of the eaves gutter 10, and the upper drain member 920 is placed on the upper surface of the bottom plate 11 of the eaves gutter. The inner tube portion 922 is inserted into the outer tube portion 912 through the pilot hole 11H, and the lower drain member 910 and the upper drain member 920 are positioned so that their tube axis O1 and tube axis O2 are approximately coaxial. The inner threaded portion 915 and the outer threaded portion 925 are screwed together to form the drain member 900.

[0008] In addition, the lower drain member 910 has a step portion 914 formed at the bottom of the outer tube reduced diameter portion 913, and the lower surface 914A of the step portion 914 abuts against the upper end surface of the receiving portion of the elbow (not shown) connected downstream, thereby setting the distance between the drain members 900 to a predetermined dimension. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] JP 2019-007340 A Summary of the Invention [Problem to be solved by the invention]

[0010] However, when inserting the inner tube portion 922 into the outer tube portion 912 to combine the lower drain member 910 and the upper drain member 920, the lower end portion 922T of the inner tube portion 922 may get caught on the upper surface 914B of the step portion 914, as shown in FIG. 16B. When the lower end 922T of the inner cylinder portion 922 gets caught on the upper surface 914B of the step portion 914 in this way, it becomes difficult to smoothly insert the inner cylinder portion 922 into the outer cylinder portion 912 and efficiently position it in the specified position.

[0011] 16B, gaps may be formed at intervals in the circumferential direction in the inner peripheral thread portion 915 formed on the inner peripheral surface of the outer cylindrical portion 912. Therefore, when the inner cylindrical portion 922 is inserted into the outer cylindrical portion 912 to combine the lower drain member 910 and the upper drain member 920, the outer peripheral thread portion 925 may enter the gaps formed in the inner peripheral thread portion 915, and the inner peripheral thread portion 915 and the outer peripheral thread portion 925 may be fitted together with the tube axis O1 and the tube axis O2 tilted. If the inner threaded portion 915 and the outer threaded portion 925 are engaged with the pipe axes O1 and O2 tilted, the pipe axes O1, O2 of the lower drain member 910 and the upper drain member 920 will not be arranged coaxially, and the upper drain member 920 will be engaged at an angle relative to the lower drain member 910, which may prevent the desired siphon action from occurring or may result in a gap between the upper drain and the bottom surface of the eaves gutter, causing water leakage. Therefore, there is a need for a drain member that allows the inner tubular portion of the upper drain member to be smoothly inserted into the outer tubular portion of the lower drain member and that can be efficiently positioned in a predetermined position.

[0012] The present invention has been made in consideration of the above circumstances, and has an object to provide a drain member that allows the inner cylindrical portion of the upper drain member to be smoothly inserted into the outer cylindrical portion of the lower drain member. [Means for solving the problem]

[0013] In order to solve the above problems, the present invention proposes the following means. (1) A first aspect of the present invention is a drainage member having a bottom plate and side plates extending upward from both ends of the bottom plate in the width direction, the drainage member being attached to an eaves gutter having a pilot hole formed in the bottom plate, the drainage member having a lower flange portion disposed on the underside of the bottom plate and having an inlet formed on its inner periphery, an outer tubular portion formed below the lower flange portion and extending downward, an outer tubular reduced diameter portion connecting an upper end of the lower flange portion and the outer tubular portion and reduced in diameter as it extends downward, and an inner circumferential thread portion formed on the inner circumferential surface of the outer tubular portion, and a drop opening portion formed on the inner periphery of the lower drainage member, the lower flange portion having an inlet formed on the inner periphery of the outer tubular portion, the lower drainage member being disposed on the upper surface of the bottom plate and having an inlet formed on its inner periphery. and an upper drain member having an upper flange portion, an inner cylinder portion formed below the upper flange portion, extending downward and inserted into the zk outer cylinder portion, an inner cylinder tapering portion connecting the upper flange portion and an upper end of the inner cylinder portion and tapering in diameter as it extends downward, and an outer peripheral thread portion formed on the outer peripheral surface of the inner cylinder portion and screwed into the inner peripheral thread portion, wherein at least one of the upper drain member and the lower drain member has an insertion guide portion that guides the inner cylinder portion toward the inner peripheral side of the outer cylinder portion when the upper drain member and the lower drain member are attached.

[0014] According to the drain member of the present invention, at least one of the upper drain member and the lower drain member is provided with an insertion guide portion, so that when the upper drain member and the lower drain member are attached, the inner tube portion is guided toward the inner side of the outer tube portion. As a result, the inner cylindrical portion of the upper drain member can be smoothly inserted into the outer cylindrical portion of the lower drain member.

[0015] (2) In the drain member described in (1) above, the insertion guide portion may be formed on the inner surface of the outer tube tapered portion and may be configured as a continuously tapered inner surface that is continuously tapered to the inner surface of the outer tube portion.

[0016] According to the drain member of this invention, the insertion guide portion is formed on the inner surface of the outer tube narrowing portion and is composed of a continuously narrowing inner surface that continuously narrows to the inner surface of the outer tube portion, so that the inner tube portion of the upper drain member is guided to the inside of the outer tube portion without getting caught on the outer tube narrowing portion. As a result, the inner cylindrical portion can be guided toward the inside of the outer cylindrical portion efficiently and stably.

[0017] Here, "a continuous tapered inner circumferential surface formed on the inner circumferential surface of the tapered outer tube portion and tapered continuously to the inner circumferential surface of the outer tube portion" means that, in a cross section including the tube axis, the inner circumferential surface of the tapered outer tube portion is smoothly formed to the upper end of the outer tube portion by straight or curved lines, or a line having a shape that combines straight and curved lines. In other words, it means that there are no bulges on the inner circumferential surface of the tapered outer tube portion that cause steps or snagging. In other words, it is desirable that at least when the inner circumferential surface of the tapered outer tube portion is tapered, it is always accompanied by a change in position in the tube axis direction. It is also acceptable if a bulge that does not cause snagging is formed along the way.

[0018] (3) In the drain member described in (1) or (2) above, the insertion guide portion may be configured with a guide sleeve extending downward from a lower end portion of the outer peripheral thread portion.

[0019] According to the drain member of the present invention, the insertion guide portion is constituted by a guide sleeve extending downward from the lower end of the outer peripheral threaded portion, so that contact with the inner peripheral surface of the outer tube reduced diameter portion is suppressed. As a result, the inner cylindrical portion can be guided toward the inside of the outer cylindrical portion efficiently and stably.

[0020] Here, the "lower end of the outer thread" refers to the position where the height of the outer thread is zero. Also, the "guide sleeve whose outer circumferential surface on the lower side is the same diameter or smaller than that on the upper side" refers to, for example, a guide sleeve formed in a straight cylindrical shape of the same diameter from the upper end to the lower end, a tapered shape with the lower side being smaller in diameter than the upper side, or a shape formed in a combination of a straight shape and a tapered shape, with no flat part (step part, protrusion) facing downward between the upper end and the lower end of the guide sleeve due to the diameter being larger toward the outer circumferential side than the upper side. Note that a hill-shaped bulge that does not interfere with insertion is permitted.

[0021] (4) In the drain member described in (3) above, the length of the guide sleeve in the axial direction may be set to be longer than the length of the outer tube reduced diameter portion of the lower drain member in the axial direction.

[0022] According to the drain member of the present invention, the length of the guide sleeve in the axial direction of the pipe is set longer than the length of the outer tube reduced diameter portion of the lower drain member in the axial direction of the pipe. Therefore, the inner tube portion can be inserted into the outer tube portion without the outer peripheral surface of the inner tube portion coming into contact with the inner peripheral surface of the outer tube portion.

[0023] (5) In the drain member described in (3) or (4) above, the length of the guide sleeve in the axial direction may be set shorter than the length of the outer tubular portion of the lower drain member in the axial direction.

[0024] According to the drain member of the present invention, the length of the guide sleeve in the axial direction of the pipe is set shorter than the length of the outer tube portion of the lower drain member in the axial direction of the pipe, thereby preventing the guide sleeve from being exposed downward from the outer tube portion. As a result, when the upper drain member is inserted into the lower drain member to form the drain member, the inner cylindrical portion is prevented from coming into contact with a downstream joint or the like.

[0025] (6) The drain member described in (5) above may have a recess formed in the outer tube portion of the lower drain member, the recess extending upward from the lower end, and the lower end portion of the guide sleeve may be positioned above an upper bottom surface of the recess.

[0026] According to the drain member of the present invention, a recess (e.g., a recess for attaching a tool) that is recessed upward from the lower end is formed in the outer tubular portion of the lower drain member, and the lower end of the guide sleeve is positioned above the upper bottom surface of the recess, so that the guide sleeve (inner tubular portion) does not overlap with the recess. As a result, when inserting a construction tool into this recess to assemble the lower drain member and the upper drain member, the construction tool will not come into contact with the lower end surface of the guide sleeve, which will hinder construction, and the drain members can be installed efficiently.

[0027] (7) The drain member described in any one of (1) to (6) above may have a linear bent recess disposed around the entire circumference of the lower surface of the upper flange portion at a position corresponding to a peripheral portion of the pilot hole, and formed by bending at the boundary between a flat surface on the outer periphery and a protruding surface on the inner periphery that protrudes downward.

[0028] According to the drain member of the present invention, the upper drain member is arranged around the entire circumference at a position corresponding to the peripheral edge of the pilot hole (of the eaves gutter) on the lower surface of the upper flange portion, and is provided with a linear bent recess formed by bending at the boundary between the flat surface on the outer circumference and the protruding surface on the inner circumference that protrudes downwardly. Therefore, there is no need for a positioning step portion that is inserted into the inner surface (inner wall surface) of the pilot hole and positioned based on the inner surface (inner wall surface), and the positioning step portion, etc. does not come into direct contact with the inner surface of the pilot hole. This prevents adhesive applied to the underside of the upper flange from dripping into the pilot hole or through the pilot hole onto the inner periphery of the pilot hole or onto the underside of the bottom plate. As a result, the drain member can be positioned stably with high quality relative to the pilot hole.

[0029] Here, "a position corresponding to the peripheral portion of the pilot hole" is preferably the same position as the upper corner of the pilot hole, but may also be a position near the peripheral portion of the pilot hole where the flat surface on the outer periphery is stably positioned on the upper surface of the bottom plate with adhesive or the like sandwiched therebetween.

[0030] Furthermore, the term "linearly bent recess formed by bending at the boundary" refers to a recess that opens at the boundary between the flat surface and the protruding surface at an intersection angle of the lower side between the flat surface and the protruding surface (the tangent direction at the boundary if the protruding surface is curved) that is greater than 90°. The intersection angle on the lower side is preferably 120° or more, and more preferably 150° or more. In order to stably hook onto the upper corner of the pilot hole, for example, the intersection angle is preferably 160° or less.

[0031] (8) In the drain member described in any one of (1) to (7) above, the upper drain member may have a continuously tapered outer peripheral surface formed on the outer peripheral surface of the inner tube tapered portion and whose diameter is continuously tapered to the outer peripheral surface of the inner tube portion.

[0032] According to the drain member of the present invention, the upper drain member is provided with a continuously reduced outer peripheral surface formed on the outer peripheral surface of the inner tube reduced diameter portion and which continuously reduces in diameter up to the outer peripheral surface of the inner tube portion, thereby preventing the inner tube reduced diameter portion of the upper drain member from getting caught on the inner peripheral surface of the receiving port formed on the inner side of the lower flange portion or the inner peripheral surface of the outer tube reduced diameter portion. As a result, the inner cylindrical portion can be guided toward the inside of the outer cylindrical portion efficiently and stably.

[0033] Here, "a continuous tapered outer peripheral surface formed on the outer peripheral surface of the tapered inner tube portion and tapered continuously to the outer peripheral surface of the inner tube portion" means that in a cross section including the tube axis, the outer peripheral surface of the tapered inner tube portion is smoothly configured to the upper end of the inner tube portion by straight or curved lines, or a line that combines straight and curved lines. In other words, it means that there are no steps on the outer peripheral surface of the tapered inner tube portion. In other words, it is desirable that at least when the outer peripheral surface of the tapered inner tube portion reduces in diameter, it is always accompanied by a change in position in the tube axis direction. It is also acceptable if a bulge that does not cause a catch is formed along the way.

[0034] (9) In the drain member described in any one of (1) to (8) above, the lower drain member may be provided with a protrusion on an upper portion of the outer tubular portion, extending toward the outer periphery and corresponding to a receiving portion of a coupling member to which the outer tubular portion is connected.

[0035] According to the drain member of the present invention, the lower drain member is provided with a protrusion formed on the outer peripheral surface of the outer tube reduced diameter portion and corresponding to the receiving portion of the coupling member (such as a downstream elbow) to which the outer tube portion is connected, so that the relative position with respect to the coupling in the pipe axial direction can be accurately and efficiently set.

[0036] (10) A second aspect of the present invention is a siphon drain member comprising: a drain member according to any one of (1) to (8) above; and a siphon portion disposed on an upper portion of the upper drain member.

[0037] According to the siphon drain member of the present invention, the inner cylindrical portion of the upper drain member can be smoothly inserted into the outer cylindrical portion of the lower drain member.

[0038] (11) A third aspect of the present invention is a piping structure comprising the drain member according to any one of (1) to (8) above. Effect of the Invention

[0039] According to the drain member, siphon drain member, and piping structure of the present invention, the inner cylindrical portion of the upper drain member can be efficiently inserted into a predetermined position of the outer cylindrical portion of the lower drain member. [Brief description of the drawings]

[0040] [Figure 1] FIG. 1 is a side view illustrating a gutter piping structure provided with a siphon drain member (drain member) according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a perspective view illustrating the outline of the siphon drain member according to the first embodiment, showing the state where it is attached to an eaves gutter. [Diagram 3]FIG. 2 is a perspective view illustrating details of a siphon drain member according to the first embodiment. [Figure 4] FIG. 2 is a schematic diagram illustrating the schematic configuration of the siphon drain member according to the first embodiment, taken perpendicular to the longitudinal direction of the eaves gutter. [Diagram 5] FIG. 2 is an exploded schematic diagram including an eaves gutter, illustrating the schematic configuration of the siphon drain member according to the first embodiment. [Figure 6A] FIG. 2 is a vertical cross-sectional view illustrating a schematic configuration of the siphon drain member according to the first embodiment in an assembled state. [Figure 6B] FIG. 2 is a vertical cross-sectional view illustrating a schematic configuration of the siphon drain member according to the first embodiment in an exploded state. [Figure 6C] FIG. 2 is a vertical cross-sectional view illustrating a schematic configuration of a drop opening portion of the siphon drain member according to the first embodiment. [Figure 6D] FIG. 2 is a vertical cross-sectional view illustrating the relationship between a lower drain member and a socket portion of an elbow, illustrating the schematic configuration of the siphon drain member according to the first embodiment. [Figure 7A] FIG. 11 is a vertical cross-sectional view illustrating a schematic configuration of a siphon drain member according to a second embodiment of the present invention in an assembled state. [Figure 7B] FIG. 11 is a vertical cross-sectional view illustrating a schematic configuration of a siphon drain member according to a second embodiment in an exploded state. [Figure 8A] FIG. 11 is a vertical cross-sectional view illustrating a schematic configuration of a siphon drain member according to a third embodiment of the present invention in an assembled state. [Figure 8B] FIG. 11 is a vertical cross-sectional view illustrating a schematic configuration of a siphon drain member according to a third embodiment in an exploded state. [Figure 9A] FIG. 13 is a vertical cross-sectional view illustrating a schematic configuration of a siphon drain member according to a fourth embodiment of the present invention in an assembled state. [Figure 9B] FIG. 13 is a vertical cross-sectional view illustrating a schematic configuration of a siphon drain member according to a fourth embodiment in an exploded state. [Figure 9C] 13 is a vertical cross-sectional view illustrating a schematic configuration of a positioning edge portion formed on an upper drain member according to a fourth embodiment. FIG. [Figure 9D] FIG. 9D is a vertical cross-sectional view showing a modified example of the upper drain member according to the fourth embodiment, illustrating the schematic configuration of a portion corresponding to FIG. 9C. [Figure 10A] FIG. 13 is a vertical cross-sectional view illustrating a schematic configuration of a siphon drain member according to a fifth embodiment of the present invention in an assembled state. [Figure 10B] FIG. 13 is a vertical cross-sectional view illustrating a schematic configuration of a siphon drain member according to a fifth embodiment in an exploded state. [Figure 11A] FIG. 1 is a cross-sectional view of a different diameter elbow that can be applied to a gutter piping structure. [Figure 11B] 1 is a cross-sectional view of a different diameter tee that can be applied to a gutter piping structure. [Figure 12] FIG. 13 is a side view illustrating a first modified example of the gutter piping structure. [Figure 13A] FIG. 11 is a side view illustrating a second modified example of the gutter piping structure. [Figure 13B] FIG. 13B is a cross-sectional view of a third elbow of the gutter piping structure shown in FIG. 13A. [Figure 14A] FIG. 13 is a bottom view of an upper drain member according to the first and second modified examples. [Figure 14B] 14B is a cross-sectional view of an upper drain member according to a first modified example, taken along the line AA in FIG. 14A. FIG. [Figure 14C] 14B is a cross-sectional view of an upper drain member according to a first modified example, taken along the arrow BB in FIG. 14A. FIG. [Figure 14D] 14B is a cross-sectional view of an upper drain member according to a second modified example, taken along the line AA in FIG. 14A. FIG. [Figure 14E] 14B is a cross-sectional view of an upper drain member according to a second modified example, taken along the arrow BB in FIG. 14A. [Figure 15A] FIG. 13 is a bottom view of an upper drain member according to a third and fourth modified example. [Figure 15B] 15B is a cross-sectional view of an upper drain member according to a third modified example, taken along the line AA in FIG. 15A. FIG. [Figure 15C]15B is a cross-sectional view of an upper drain member according to a third modified example, taken along the line BB in FIG. 15A. [Figure 15D] 15B is a cross-sectional view of an upper drain member according to a fourth modified example, taken along the line AA in FIG. 15A. FIG. [Figure 15E] 15B is a cross-sectional view of an upper drain member according to a fourth modified example, taken along the line BB in FIG. 15A. [Figure 16A] FIG. 1 is a vertical cross-sectional view illustrating a schematic configuration of a drain member according to a conventional technique in an assembled state. [Figure 16B] FIG. 1 is a perspective view illustrating a schematic configuration of a screw structure of a siphon drain member according to a conventional technology. [Figure 16C] 1 is a vertical sectional view illustrating a problem that occurs when assembling a drain member according to a conventional technique. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0041] First Embodiment Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 to 6D. Fig. 1 is a side view illustrating a gutter piping structure including a siphon drain member (drain member) according to a first embodiment of the present invention, Fig. 2 to Fig. 5 are diagrams illustrating an outline of the siphon drain member according to the first embodiment. In the drawings, reference numeral 1 denotes a gutter piping structure (piping structure), reference numeral 10 denotes a gutter, reference numeral 11 denotes a bottom plate, reference numeral 12 denotes a side plate, and reference numeral 11H denotes a pilot hole. Reference numeral 100 denotes a siphon drain member (drain member), reference numeral 110 denotes a lower drain member, reference numeral 120 denotes an upper drain member, and reference numeral 150 denotes a siphon portion. Note that in the drawings, shapes and the like are emphasized to make the explanation easier to understand, and the dimensional relationships and the like in the drawings are not necessarily consistent.

[0042] As shown in FIG. 1, the gutter piping structure (piping structure 1) includes, for example, an eaves gutter 10, a siphon drain member (drain member) 100 attached to a circular pilot hole (through hole) 11H formed in a bottom plate 11 of the eaves gutter 10, a first elbow (elbow member) 20 connected to the underside of the siphon drain member 100, a nominal gutter 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 nominal gutter 24, and a downspout 30 connected to the downstream side of the second elbow 25.

[0043] 1, 2, 4, and 5, the eaves gutter 10 includes, for example, a bottom plate 11 and side plates 12 extending upward from both ends in the width direction of the bottom plate 11, and is formed with a groove-shaped cross section when viewed along the longitudinal direction. Also, the bottom plate 11 is formed with a pilot hole 11H that is circular in plan view and penetrates the bottom plate 11 in the thickness direction. The eaves gutter 10 is suspended by a gutter hanger (not shown) attached to a fascia board (not shown) so as to receive rainwater flowing down from the eaves (not shown) of the roof.

[0044] In this embodiment, the eaves gutter 10 is an extrusion molded product made of synthetic resin such as hard polyvinyl chloride resin, ABS, or AES. The material from which the eaves gutter 10 is made can be set as desired and is not limited to synthetic resin, but may be made from, for example, a metal extrusion molding.

[0045] In addition, when the eaves gutter 10 is made of synthetic resin, the linear expansion coefficient is set to 2.0×10 to prevent expansion and contraction due to heat. -5 / °C or less, and it is preferable to reduce the linear expansion coefficient by inserting a low-elasticity sheet such as a PET resin sheet or an iron sheet stretched into the center of the thickness of the eaves gutter 10, or by blending a low-elasticity additive such as wollastonite or carbon fiber into the synthetic resin that makes up the eaves gutter 10 itself.

[0046] In addition, the eaves gutter 10 may be applied to a large-diameter downspout having a bottom width of 100 mm or more and 200 mm or less, and a height of 90 mm or more and 150 mm or less, and capable of carrying rainwater at a flow rate of, for example, 4 liters / sec or more and 20 liters / sec or less.

[0047] 1 to 5, the siphon drain member (drain member) 100 includes, for example, a lower drain member 110, an upper drain member 120, and a siphon section 150 disposed above the upper drain member 120, and is attached to the eaves gutter 10. Specifically, the lower drain member 110 is disposed on the lower surface 11B side of the bottom plate 11 of the eaves gutter 10, and the upper drain member 120 is disposed on the upper surface 11A side of the bottom plate.

[0048] The material for forming the siphon drain member 100 can be selected arbitrarily. In this embodiment, the siphon drain member 100 is an injection molded product made of synthetic resin such as hard polyvinyl chloride resin, polycarbonate, ABS, AES, etc. However, it is not limited to synthetic resin, and may be made by casting cast iron, stainless steel, or aluminum. The lower drain member 110 and the upper drain member 120 will be described in detail later. The siphon portion 150 will be described below with reference to FIGS.

[0049] 2 to 5, the siphon part 150 includes, for example, a cover member 151, a vertical rib 155 that connects the upper drain member 120 and the cover member 151, a gripping rib 156, and an induction guide 157. The siphon part 150 is disposed above the upper drain member 120.

[0050] 2 and 3, the lid member 151 is, for example, a disk-shaped member that is circular in a plan view and is disposed above the upper drain member 120. In addition, the lid member 151 is coaxial with the tube axis of the upper drain member 120. The portion formed between the outer peripheral edge 151A of the cover member 151 and the outer peripheral edge 121C of the upper drain member 120 constitutes an inflow opening 100A through which rainwater W accumulated in the eaves gutter 10 flows into the drop opening portion 121H.

[0051] The inflow opening 100A is between the outer peripheral edge 151A of the cover member 151 and the upper surface 11A of the eaves gutter 10, or between the upper flange portion 121 of the upper drain member 120, in a direction perpendicular to the horizontal plane. For example, if the outer peripheral edge 151A of the cover member 151 is larger than the outer peripheral edge 121C of the upper flange portion 121, the inflow opening 100A is the portion formed between the outer peripheral edge 151A of the cover member 151 and the upper surface 11A of the eaves gutter 10, and if the outer peripheral edge 151A of the cover member 151 is smaller than the outer peripheral edge 121C of the upper flange portion 121, the inflow opening 100A is the portion formed between the outer peripheral edge 151A of the cover member 151 and the upper surface 121A of the upper flange portion 121.

[0052] The size, height, and shape of the cover member 151 described below are adjusted so that the area of ​​the inflow opening 100A is larger than the opening area A1 of the drop opening portion 121H described above. In this embodiment, the area of ​​the inflow opening 100A can be calculated by multiplying the circumference of the circular cover member 151, i.e., the length of the outer circumferential edge 151A, by the height H of the cover member 151.

[0053] The cover member 151 is supported by the upper drain member 120 in a state in which the cover member 151 is supported from below by a plurality of vertical ribs 155 . As described above, the cover member 151 is disposed inside the eaves gutter 10, disposed at a position spaced upward from the drop opening 121H, and forms an inflow opening 100A for allowing rainwater W to flow into the drop opening 121H on the upper surface 11A of the eaves gutter 10 below the cover member 151. It is preferable that the cover member 151 is set at a height H of 10 to 60 mm upward from the upper surface 11A of the eaves gutter 10.

[0054] The size of the cover member 151 in plan view can be set arbitrarily, but it is preferable that the cover member 151 is disposed so as to close the opening of the drop mouth portion 121H and is set to be larger than the opening area of ​​the drop mouth portion 121H. Note that the size may be set to be equal to or smaller than the opening area of ​​the drop mouth portion 121H. Also, for example, a through hole may be formed in the lid member 151 in the vertical direction, penetrating from the top surface to the drop opening portion 121H.

[0055] Furthermore, it is more preferable that the height H of the cover member 151 is set at a position 30 to 40 mm above the bottom surface 10a of the eaves gutter 10, and that the diameter of the cover member 151 is set to 150 to 200% of the opening outer diameter R1 of the drop opening portion 121H. If the diameter of the lid member 151 is smaller than 150% of the opening outer diameter R1 of the drop opening portion 121H, the water level in the eaves gutter 10 will be lower than the lid member 151, and there is a risk that the lid member 151 will not come into contact with the inflowing water. Also, if the diameter of the lid member 151 exceeds 200%, the proportion of the water flowing in from the inflow opening 100A that collides with the lid member 151 increases, and the water level in the eaves gutter 10 will become too high above the lid member 151, which may reduce siphon performance.

[0056] For the siphon action to occur, the water level in the eaves gutter 10 must be higher than the inlet opening 100A, and the height H of the cover member 151 must be lower than the maximum water level in the eaves gutter 10. For a stable siphon action to occur, the height H of the cover member 151 is preferably 0.1 to 0.5 times the maximum water level in the eaves gutter 10, and more preferably 0.2 to 0.45 times the height. The maximum water level in the eaves gutter 10 refers to the lowest height of the side panel 12 of the eaves gutter 10 from the bottom panel 11.

[0057] Furthermore, the inner diameter (opening outer diameter) R1 of the inner cylinder inner circumferential hole 122H of the inner cylinder portion 122 suitable for providing the cover member 151 set at the position described above is preferably 50 mm or more and 170 mm or less, and more preferably 70 mm or more and 170 mm or less. That is, by setting the opening outer diameter R1 of the drop port portion 121H to the lower limit of 50 mm or more, a large amount of wastewater generated in the siphon portion (siphon drain member 100) 50 can be smoothly drained. Furthermore, by setting the upper limit at 170 mm or less, the fit is smaller, preventing the joints and supports from becoming larger.

[0058] 2 to 5, the cover member 151 is provided with gripping ribs 156 which protrude upward from the upper surface 151B and are arranged at intervals in the circumferential direction. By gripping the gripping ribs 156, the rotation operation for tightening the siphon drain member 100 can be easily performed.

[0059] Moreover, the gripping rib 156 is composed of a rib main body 156A extending in the circumferential direction, and extensions 156B protruding from both ends of the rib main body 156A toward the outer periphery. For example, when attaching the siphon drain member 100 to the first elbow 20, a rod-shaped member can be engaged between the gripping ribs 156, 156 adjacent to each other in the circumferential direction, and then the rod-shaped member can be rotated to tighten the gripping ribs. In addition, since gaps are formed between the gripping ribs 156, 156, debris such as fallen leaves in the eaves gutter 10 can easily pass through and can be prevented from becoming entangled.

[0060] 3 to 5, the guide guides 157 are provided in the center of the underside 151C of the lid member 151 in a plan view, and have curves that gradually extend downward toward the drain axis O (the center of the lid), and extend radially from the drain axis O. The guide guides 157 are intended to guide the rainwater W in the eaves gutter 10 from the inlet opening 100A to the drop opening (the opening of the drop opening 121H). The induction guide 157 may be formed of a funnel-shaped or cylindrical wall portion having holes at the upper and lower ends.

[0061] As shown in Fig. 3, the vertical ribs 155 connect the upper surface 121A of the upper drain member 120 and the outer periphery of the lower surface 151C of the cover member 151. That is, the cover member 151 is supported from below by the vertical ribs 155 and is held at a position that ensures a predetermined height H from the upper surface 11A of the eaves gutter 10. These vertical ribs 155 are provided at the inlet opening 100A and are formed to cross the radial direction and curve in a plan view. That is, the vertical ribs 155 have the function of rectifying the rainwater W that flows from the inlet opening 100A to the drop mouth portion 121H.

[0062] In the siphon portion 150, the inner diameter of the inner cylinder inner circumferential hole 122H of the inner cylinder portion 122 and the upper surface 123A on the inner surface side to which the upper flange portion 121 is connected are tapered or curved to form a bell-mouth shape. When the upper surface (connecting portion) 123A on the inner surface side is curved, it is preferable that the radius of curvature of the cross section in the direction parallel to the drain axis O is 5 mm to 20 mm. The connecting portion between the upper flange portion 121 and the upper surface 123A may be bent upward.

[0063] Next, the operation of the siphon portion 150 of the above-mentioned siphon drain member 100 will be described. 3, when viewed from above, the siphon section 150 closes the opening of the drop port section 121H, and even when a large amount of rainwater flows in from the inlet opening 100A during heavy rain, the downspout 30 becomes full and water-sealed without sucking in air. As a result, a siphon phenomenon can be generated downstream.

[0064] Such a siphon drain member 100 is provided, for example, on the inside of the eaves gutter 10 arranged 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 function.

[0065] The first elbow (elbow member, joint member) 20 is a joint installed on the downstream side of the siphon drain member (drain member) 100. The first elbow 20 is connected to the lower side of the siphon drain member 100, as shown in FIG. As shown in FIG. 1, the first elbow 20 includes a first socket portion (one end) 21, a second socket portion (the other end) 22, and a curved pipe portion 23 that is curved at approximately 90° in a side view.

[0066] The first receiving portion 21 is formed with an inner diameter that allows it to be connected to the lower drain member 110 of the siphon drain member 100, and as shown in Fig. 1, a receiving bottom surface 21A that is tapered toward the curved pipe portion 23 is formed at the connection portion with the curved pipe portion 23. This receiving bottom surface 21A abuts against the inserted piping book end, making it possible to secure the relative position with respect to the piping.

[0067] In order to allow the rainwater W to flow smoothly without reducing the flow rate of the rainwater W flowing in from the first receiving port 21, it is preferable that the curved pipe section 23 is formed so that, for example, the radius of curvature of the outer wall section (the side with smaller curvature) and the inner wall section is at least 64 mm and smaller than 125 mm when viewed in a cross section including the pipe axis (along the pipe axis). Further, the second receiving portion 22 of the first elbow 20 is connected to the upstream end portion of a call down pipe 24 .

[0068] The inlet pipe 24 is a member that horizontally guides the rainwater W that flows down from the first elbow 20, and is a straight pipe that extends horizontally to horizontally guide the rainwater W that flows down from the siphon drain member 100. The downstream side is connected to the upper end 30A of the downpipe 30 by the second elbow 25.

[0069] In addition, it is preferable that the length of the call pipe 24 from the upstream end to the downstream end 24B of the call pipe 24 (call pipe length) be more than 0 m and not more than 1.5 m, more preferably 0.6 m or more and not more than 1.5 m, and even more preferably 0.6 m or more and not more than 1.0 m. By setting the length of the nominal gutter within the above-mentioned range, the rainwater W flowing down from the first elbow 20 can flow smoothly in a full water state. A downstream end 24B of the outlet pipe 24 is connected to a first receiving portion of a second elbow 25. The second elbow 25 has a similar configuration to the first elbow 20.

[0070] An upper end portion 30A of a downspout 30 is connected to a second receiving portion of the second elbow 25. The downspout 30 is a member that vertically draws the rainwater W that has flowed down the second elbow 25, and is a straight pipe that extends in the vertical direction. The lower end side of the downspout 30 is connected, for example, to a catchment basin (not shown) that is connected to the ground and buried underground. The catchment basin is configured to be connected to a drainage structure such as a sewer pipe via a connecting pipe (not shown).

[0071] The downspout 30 is a straight pipe arranged in the vertical direction along the outer wall of the building, and is a member that allows the rainwater W that flows down from the second elbow 25 to flow downward. The height from the upper end to the lower end of the downspout 30 is, for example, 2.0 m or more, preferably 3.0 m or more, and more preferably 4.0 m or more. By having the length (height dimension) of the downspout within the above range, the siphon effect in the downspout 30 can be satisfactorily generated and maintained. When the downspout length is longer, the amount of rainwater W draining down to the lower end increases, and the rainwater W flows forcefully into the catch basin.

[0072] In the gutter 1 assembled in this manner, rain falling on the roof flows into the siphon drain member 100 provided in the eaves gutter 10 through the inlet opening 100A, passes through the drop outlet portion 121H, flows through the first elbow 20, the lower gutter 24, and the second elbow 25, and then flows down into the downspout 30. Then, the rainwater W that flows from the lower pipe 24 into the downpipe 30 flows down into a drain pipe (not shown) buried underground. At this time, the downstream side of the siphon drain member 100 is filled with water and sealed, so the rainwater flows down the downpipe 30 in a full water state, causing a siphon phenomenon in the drop opening 121H, the lower pipe 24, and the downpipe 30, and the rainwater is forcefully drained from the downpipe 30 to the drain pipe (not shown).

[0073] Here, the second elbow 25 may have a configuration in which the first and second sockets have the same diameter. However, as shown in FIG. 11A, the second elbow 25A (different diameter elbow) may have a different diameter between the first socket 26 and the second socket 27. The second elbow 25A includes a curved pipe portion 28. The curved pipe portion 28 connects the first socket 26 and the second socket 27. When the curved pipe portion 28 is viewed in a cross section in a plane including the pipe axis of the curved pipe portion 28, the curvature of the inner peripheral side portion of the curved pipe portion 28 and the curvature of the outer peripheral side portion of the curved pipe portion 28 gradually change and become smaller. At this time, the radius of curvature of the inner peripheral side portion of the curved pipe portion 28 and the radius of curvature of the outer peripheral side portion of the curved pipe portion 28 gradually increase. The diameter of the second elbow 25A increases from the upstream to the downstream.

[0074] It is preferable that the nominal diameter of the second socket 27 (larger diameter side socket, downstream side socket) is at least one size larger than the nominal diameter of the first socket 26 (smaller diameter side socket, upstream side socket) of the second elbow 25A. For example, the nominal diameter of the first socket 26 may be 75 (outer diameter 89 mm) or 100 (outer diameter 114 mm). The nominal diameter of the second socket 27 may be 100 (outer diameter 114 mm) or 125 (outer diameter 140 mm).

[0075] The joint connecting the outlet pipe 24 and the downpipe 30 is not limited to an elbow. For example, a tee 25B as shown in FIG. 11B may connect the outlet pipe 24 and the downpipe 30. The tee 25B includes a third receiver 29 in addition to the first receiver 26 and the second receiver 27. The second receiver 27 and the third receiver 29 are connected through a straight pipe 29a. The curved pipe portion 28 extends laterally from the straight pipe 29a. In the tee 25B, it is preferable to provide a lid (not shown) on the third receiver 29. The lid is detachable from the third receiver 29. The third receiver 29 functions as a cleaning port. It is also possible to connect a downpipe that drains rainwater from a higher position without providing a lid. 11B is a different-diameter tee in which the diameter of first receiving port 26 is different from the diameter of second receiving port 27. However, in tee 25B, first receiving port 26 and second receiving port 27 may have the same diameter.

[0076] In this way, using a different diameter elbow as the second elbow 25A or a different diameter tee as the tee 25B is particularly effective for a gutter piping structure 1A in which a junction joint 31 (junction portion) is provided in the downpipe 30 as shown in FIG. 12. The junction joint 31 is provided at a midpoint in the height direction of the downpipe 30. The junction joint 31 is, for example, a tee. At the junction joint 31, rainwater from another downpipe 10A joins with rainwater that has flowed down the downpipe 30. When rainwater from another downpipe 10A joins at a midpoint of the downpipe 30 as in the gutter piping structure 1A, if the capacity of the downpipe 30 is small, the downpipe 30 is likely to be filled with water, and there is a risk that the rainwater will not be able to join at the junction joint 31 even if it tries to do so. Therefore, as mentioned above, by using a different diameter elbow (second elbow 25A) or a different diameter tee (tee 25B) and increasing the capacity of the downspout 30 (enlarging the diameter of the downspout 30), a margin will be created in the allowable flow rate in the downspout 30, and the confluence of rainwater will be reliably achieved.

[0077] In the gutter piping structure 1A shown in FIG. 12, rainwater flowing through the downpipe 30 is drained into the rainwater sump 160. The downpipe 30 and the rainwater sump 160 are connected via a third elbow 161 and a horizontal pipe 162. The lower end of the downpipe 30 is buried in the ground. The third elbow 161 is connected to the lower end of the downpipe 30. The first end of the horizontal pipe 162 is connected to the third elbow 161. The second end of the horizontal pipe 162 is disposed in the rainwater sump 160. The third elbow 161 and the horizontal pipe 162 constitute the drain pipe described above. By adopting a different diameter elbow as the second elbow 25A, the rainwater flowing inside the downpipe 30 does not become full and the flow rate is slowed. Therefore, it is possible to prevent water from splashing out of the rainwater sump 160.

[0078] Here, the third elbow 161A may be a different diameter elbow as in the gutter piping structure 1B shown in Fig. 13A. As shown in Figs. 13A and 13B, the third elbow 161A has a first socket 26, a second socket 27, and a curved pipe portion 28, similar to the second elbow 25A. The first socket 26 is connected to the lower end of the downpipe 30. The second socket 27 is connected to a first end of the horizontal pipe 162. In this case, the flow rate is slowed down inside the third elbow 161A, so that the water can be prevented from splashing out of the rainwater catch basin 160. In the gutter piping structures 1A and 1B, both the second elbow 25A and the third elbow 161 may be different diameter elbows, but it is difficult to use a tee for the third elbow 161A because the third elbow 161A is buried underground.

[0079] Next, the lower drain member 110 and the upper drain member 120 constituting the siphon drain member 100 will be described with reference to FIGS. 6A to 6D. Fig. 6A is a longitudinal sectional view showing the assembled state and Fig. 6B is a longitudinal sectional view showing the disassembled state, which explains the schematic configuration of the siphon drain member according to the first embodiment. Fig. 6C is a longitudinal sectional view showing the schematic configuration of the drop port of the siphon drain member, and Fig. 6D is a longitudinal sectional view showing the relationship between the lower drain member and the socket portion of the elbow, which explains the schematic configuration of the siphon drain member. Figs. 6A and 6B are simplified views of the siphon drain member with the siphon portion omitted.

[0080] As described above, the siphon drain member (drain member) 100 includes the lower drain member 110, the upper drain member 120, and the siphon portion 150 disposed above the upper drain member 120.

[0081] As shown in Figures 6A and 6B, the lower drain member 110 includes, for example, a lower flange portion 111 arranged on the lower surface 11B of the eaves gutter 10, an outer tube portion 112 formed below the lower flange portion 111 and extending downward, an outer tube reduced diameter portion 113 connecting the lower flange portion 111 and the outer tube portion 112, and an inner thread portion 115 formed on the inner surface of the outer tube portion 112.

[0082] The lower flange portion 111 is formed, for example, in a circular outer shape in a plan view, and a receiving hole 111H having a circular shape in a plan view is formed on the inner periphery side. That is, the lower flange portion 111 is formed of a flat plate having a ring shape in a plan view. Further, the lower flange portion 111 has an outer peripheral upper surface 111A formed as a flat surface, and an inner peripheral side formed as a recess recessed downward from the flat surface. An upper surface 111A of the lower flange portion 111 is disposed on a lower surface 11B of the bottom plate 11 of the eaves gutter 10.

[0083] The outer cylinder portion 112 is formed, for example, in a cylindrical shape centered on the pipe axis O1, and extends in the vertical direction while being attached to the eaves gutter . Further, on the inside of the outer cylinder portion 112, an outer cylinder inner peripheral hole 112H is formed which penetrates vertically. Further, an inner peripheral thread portion 115 is formed on the inner peripheral surface of the outer cylinder portion 112 . Further, four tool mounting recesses (recesses) 118 recessed upwardly are formed at a lower end 112T of the outer cylinder portion 112 at intervals of 90° in the circumferential direction. It is possible to arbitrarily set the position and number of the tool mounting recesses (recesses) 118. In addition, the vertical position of the upper bottom surface 118A of the tool mounting recesses (recesses) 118 can be arbitrarily set, but it is preferable that the tool mounting recesses (recesses) 118 be formed below the lower end of the inner cylinder portion 122.

[0084] As shown in FIGS. 6A and 6B, outer cylinder reduced diameter portion 113 connects lower flange portion 111 and the upper end portion of outer cylinder portion 112 by decreasing in diameter as it extends downward. Also, an insertion guide portion (continuously reduced inner diameter surface) 113G is formed on the inner peripheral 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 peripheral side of a substantially conical cylinder whose diameter is continuously reduced from the upper end of the outer cylinder reduced diameter portion 113 to the inner peripheral surface of the outer cylinder portion 112. That is, the insertion guide portion (continuously reduced inner diameter surface) 113G is configured to have no steps protruding toward the inner peripheral side or bulges that may cause catches.

[0085] The shape of the continuously tapered inner diameter surface can be set arbitrarily, and is not limited to an inclined surface formed in an approximately conical shape in which the cross section including the tube axis O1 is tapered in a linear manner, but may be, for example, configured such that the cross section is tapered in a curved manner, or may be configured with an inclined surface that combines straight lines and curves.

[0086] The inner peripheral thread portion 115 is formed on the inner peripheral surface of the outer cylindrical portion 112 . It should be noted that various known shapes can be applied to the inner circumferential thread portion 115. Specifically, it may be formed at intervals in the circumferential direction or may be formed continuously in the circumferential direction.

[0087] As shown in Figures 6A and 6B, the upper drain member 120 includes, for example, an upper flange portion 121 disposed on the upper surface 11A of the bottom plate 11 and having a drop portion 121H formed on its inner peripheral side, an inner tube portion 122 formed below the upper flange portion 121 and extending downward, an inner tube reduced diameter portion 123 connecting the upper ends of the upper flange portion 121 and the inner tube portion 122 and reducing in diameter as it extends downward, and an outer peripheral thread portion 125 formed on the outer peripheral surface of the inner tube 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 peripheral thread portion 125 and the inner peripheral thread portion 115 are screwed together to form the siphon drain member 100.

[0088] The upper flange portion 121 is formed, for example, in a circular outer shape in a plan view, and a drop opening portion 121H, which is also circular in a plan view, is formed on the inner periphery side. That is, the upper flange portion 121 is formed in a flat plate shape that is ring-shaped in a plan view. The lower surface 121B of the upper flange portion 121 is disposed on the upper surface 11A of the bottom plate 11 of the eaves gutter 10.

[0089] In addition, the lower surface 121B of the upper flange portion 121 has, for example, a flat surface formed on the outer circumferential side, and a positioning step portion 126 made of a cylindrical portion protruding downward along the tube axis O2 formed on the inner circumferential side of the flat surface. The positioning step 126 comes into contact with the inner peripheral surface of the pilot hole 11H of the eaves gutter 10, so that the upper drain member 120 can be positioned relative to the pilot hole 11H. As shown in FIG. 3, upper surface 121A of upper flange portion 121 is configured with a gently curved portion.

[0090] The inner cylinder portion 122 is formed, for example, in a cylindrical shape that can be inserted into the outer cylinder portion 112 with the pipe axis O2 as its center, and extends in the vertical direction while attached to the eaves gutter . Further, an inner peripheral hole 122H is formed in the inner side of the inner cylinder portion 122, penetrating vertically. Further, an outer circumferential screw portion 125 is formed on the outer circumferential surface of the inner cylindrical portion 122 .

[0091] As shown in FIGS. 6A and 6B, the inner cylinder reduced diameter portion 123 connects the upper flange portion 121 and the upper end portion 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 reduced diameter portion 123 constitutes a flow path surface from the drop opening portion 121H in the siphon portion 150 described above to the inner cylinder inner peripheral hole 122H.

[0092] In this embodiment, the outer circumferential surface of the inner tube narrowing portion 123 is a continuous narrowing outer circumferential surface that is continuously narrowed to the outer circumferential surface of the inner tube portion 122. Specifically, the outer circumferential surface of the inner tube narrowing portion 123 is formed into a smooth shape by a gentle curve that is recessed toward the inner circumferential side to the upper end of the inner tube portion 122 in a cross section including the tube axis O1. That is, no steps are formed on the outer circumferential surface of the inner tube narrowing portion. The continuous narrowing outer circumferential surface may be formed by a straight line or a line that combines a straight line and a curve. In addition, it is possible to arbitrarily set whether or not to form a continuous narrowing outer circumferential surface on the outer circumferential surface of the inner tube narrowing portion, and a configuration in which a continuous narrowing outer circumferential surface is not formed may be used.

[0093] The outer circumferential thread portion 125 is formed on the outer circumferential surface of the inner cylindrical portion 122 . In addition, the outer peripheral thread portion 125 may have various known shapes that can be screwed into the inner peripheral thread portion 115, and may be, for example, formed with intervals in the circumferential direction or formed continuously in the circumferential direction.

[0094] 6C, a description will be given of the upper surface 123A of the inner cylinder reduced diameter portion 123 which forms the flow path surface of the siphon portion 150. Reference symbol P1 shown in FIG. 6 indicates the position of the lower end of the outer cylinder reduced diameter portion 113 and the upper end of the outer cylinder portion 112. 6C, it is preferable that the radius of curvature R of the upper surface 123A of the inner cylinder reduced diameter portion 123 is formed as large as possible in consideration of, for example, the diameter D0 of the pilot hole 11H, the diameter D1 of the inner circumferential upper end of the outer cylinder reduced diameter portion 113, the diameter D2 of the drop opening portion 121H, and the height dimension L11 to the lower end P1 of the outer cylinder reduced diameter portion 113. That is, in order to avoid the outer peripheral surface of the inner cylinder reduced diameter portion 123 interfering with the inner circumferential upper end of the outer cylinder reduced diameter portion 113, it is preferable to 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.

[0095] Specifically, for example, when a joint (elbow or the like) or a 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. Also, for example, when the nominal diameter is 100, it is preferable to set the radius of curvature R to 12 mm or more and 40 mm or less, and when the nominal diameter is 125, it is preferable to set the radius of curvature R to 13 mm or more and 50 mm or less.

[0096] Next, the shape of the outer circumferential surface of the lower drain member 110 will be described with reference to FIG. 6D. The outer cylinder reduced diameter portion 113 does not have a stopper that abuts against the end face of the first socket portion 21 of the downstream joint portion (first elbow 20). Therefore, as shown in FIG. 6D, it is preferable to set the length dimension L12 to the upper end P1 of the outer tube portion 112 larger than the length dimension L0 from the end face of the first receiving portion 21 of the joint portion (first elbow 20) to the receiving bottom surface 21A. By setting it in this manner, the relative positions of the drain member 100 and the first elbow 20 in the direction of the pipe axis O2 can be accurately set, and the outer peripheral surface of the outer tube reduced diameter portion 113 can be prevented from interfering with the first receiving portion 21.

[0097] Next, a procedure for attaching the above-mentioned siphon drain member 100 to the eaves gutter 10 will be described. First, a pilot hole (through hole) 11H for attaching the siphon drain member 100 is formed in the bottom plate 11 of the eaves gutter 10. Next, for example, the lower drain member 110 is inserted into the eaves gutter 10, the inner tube portion 122 is inserted into the pilot hole 11H of the eaves gutter 10 and protrudes downward, and the step portion 126 of the upper flange portion 121 is inserted into the pilot hole 11H of the bottom plate 11 of the eaves gutter 10 and fixed. For example, an adhesive or a packing is attached to the lower surface 121B of the upper flange portion 121. Next, the outer tube portion 112 of the lower drain member 110 is inserted into the upper drain member 120, and the outer peripheral threaded portion 125 is screwed into the inner peripheral threaded portion 115. Once screwed to a specified position, an installation tool (not shown) is inserted into the tool attachment recess (recess) 118 and continued to be rotated until it is seated in a specified position, thereby fixing the drain member 100.

[0098] According to the siphon drain member 100 of the first embodiment, an insertion guide portion (continuously reduced inner diameter surface) 113G is formed on the inner surface of the outer tube reduced diameter portion 113 of the lower drain member 110, so that the inner tube portion 122 of the upper drain member 120 is guided to the inside of the outer tube portion 112 without getting caught on the inner surface of the outer tube reduced diameter portion 113. As a result, the inner cylinder portion 122 of the upper drain member 120 can be smoothly inserted into the outer cylinder portion 112 of the lower drain member 110.

[0099] According to the siphon drain member 100 of the first embodiment, the positioning step portion 126 is formed on the lower surface 121B of the upper flange portion 121, so that the siphon drain member 100 can be attached to the eaves gutter 10 accurately and efficiently.

[0100] According to the siphon drain member 100 of the first embodiment, the length dimension L12 of the straight outer periphery of the outer tube portion 112 is formed longer than the length (depth) L0 of the receiving portion of the first elbow 20, so that the relative positional relationship with the first elbow 20 in the direction of the pipe axis O can be accurately set.

[0101] <Second embodiment> A second embodiment of the present invention will now be described with reference to FIGS. 7A and 7B. Fig. 7A is a vertical cross-sectional view illustrating a schematic configuration of a siphon drain member according to a second embodiment in an assembled state, and Fig. 7B is a vertical cross-sectional view illustrating the disassembled state. Note that Figs. 7A and 7B are simplified views of the siphon drain member with the siphon portion omitted. 7A and 7B, reference numeral 200 denotes a siphon drain member (drain member), reference numeral 210 denotes a lower drain member, reference numeral 112L denotes an outer cylinder portion, reference numeral 220 denotes an upper drain member, and reference numeral 224 denotes a step portion.

[0102] As shown in Figures 7A and 7B, the siphon drain member (drain member) 200 includes, for example, a lower drain member 210, an upper drain member 220, and a siphon portion (not shown) disposed above the upper drain member 220.

[0103] As shown in Figures 7A and 7B, the lower drain member 210 includes, for example, a lower flange portion 111 arranged on the lower surface 11B of the eaves gutter 10, an outer tube portion 112L formed below the lower flange portion 111 and extending downward, an outer tube reduced diameter portion 213 connected below the lower flange portion 111, a step portion 214 formed below the outer tube reduced diameter portion 213 and connecting the upper end of the outer tube reduced diameter portion 213 and the outer tube portion 112L, and an inner thread portion 115 formed on the inner surface of the outer tube portion 112L.

[0104] The lower drain member 210 differs from the lower drain member 110 in that it includes an outer cylinder portion 112L instead of the outer cylinder portion 112, and that the lower flange portion 111 and the outer cylinder portion 112L are connected by an outer cylinder reduced diameter portion 223 and a step portion (protrusion) 224 instead of the outer cylinder reduced diameter portion 113. Since the rest are similar to the first embodiment, the same reference numerals are used and the description will be omitted.

[0105] The outer cylinder portion 112L is formed, for example, so as to have a longer vertical dimension than the outer cylinder portion 112 of the lower drain member 110 of the drain member 100. Specifically, it is formed so as to be longer than the outer cylinder portion 112 of the lower drain member 110 according to the first embodiment by a dimension corresponding to the guide sleeve (insertion guide portion) 122G. The vertical dimension of the outer cylinder portion 112L can be set arbitrarily, and may be set to be approximately the same as that of the outer cylinder portion 112.

[0106] As shown in FIGS. 7A and 7B, outer cylinder reduced diameter portion 213 connects lower flange portion 111 and the outer periphery of step portion 214 by decreasing in diameter as it extends downward. In this embodiment, the outer cylinder reduced diameter portion 213 is formed, for example, into a substantially conical cylinder whose diameter is gradually reduced linearly from the lower flange portion 111 to the outer periphery of the step portion 214 .

[0107] The step portion 214 is connected to the upper end of the outer cylinder portion 112L and is configured of a wall portion that is generally ring-shaped in plan view and extends toward the outer periphery in the horizontal direction. Further, the outer periphery of the step portion 214 is connected to the lower end portion of the outer tube reduced diameter portion 213 . A lower surface 214A of the step portion 214 constitutes a stopper when the outer cylinder portion 112L is inserted into a socket portion of an elbow (joint member) or the like.

[0108] As shown in Figures 7A and 7B, the upper drain member 220 includes, for example, an upper flange portion 121 disposed on the upper surface 11A of the eaves gutter 10 and having a drop opening portion 121H formed on its inner periphery, an inner tube portion 122 formed below the upper flange portion 121 and extending downward and having an outer periphery thread portion 125 formed on its outer periphery, an inner tube reduced diameter portion 123 connecting the upper ends of the upper flange portion 121 and the inner tube portion 122 and reducing in diameter as it extends downward, and a guide sleeve (insertion guide portion) 122G formed on the lower portion of the inner tube portion 122.

[0109] The upper drain member 220 differs from the upper drain member 120 in that it includes a guide sleeve (insertion guide portion) 122G formed on the lower portion of the inner tubular portion 122. The rest is similar to the first embodiment, so the same reference numerals are used and the description is omitted.

[0110] As shown in Figures 7A and 7B, guide sleeve (insertion guide portion) 122G extends downward from the lower end of outer peripheral thread portion 125 of inner tube portion 122, and the outer peripheral surface on the lower side is formed into a cylindrical tube shape of the same diameter as the outer peripheral surface on the upper side, thereby preventing contact with inner peripheral surface 113A of outer tube reduced diameter portion 213 and upper surface 214B of step portion 224. The shape of the guide sleeve (insertion guide portion) 122G can be set arbitrarily, for example, it may be tapered toward the tip (downward) side, or may be a combination of a tapered and straight shape. Also, it may be formed with a hill-like bulge that does not cause any catches.

[0111] The length L21 of the guide sleeve (insertion guide portion) 122G in the tube axis O2 direction can be set arbitrarily, but it is preferable to set it as shown below, for example. Specifically, it is preferable to set the length L21 of the guide sleeve (insertion guide portion) 122G to 8 mm or more. For example, it is preferable that the length L21 of the guide sleeve (insertion guide portion) 122G is set to be longer than the height dimension L13 from the upper surface 111A of the lower flange portion 111 to the upper surface 214B of the positioning step portion 214 shown in Fig. 7A. By setting L21>L13, the guide sleeve (insertion guide portion) 122G is prevented from contacting the upper surface 214B of the positioning step portion 214, and the inner tube portion 122 can be smoothly inserted into the outer tube portion 112.

[0112] In addition, it is preferable that the lower end 122T of the guide sleeve 122G is configured so as not to overlap at least a portion of the tool mounting recess 118 formed in the outer tube portion 112L of the lower drain member 110, and it is more preferable that the lower end 122T of the guide sleeve 122G is positioned above the upper bottom surface 118A of the tool mounting recess 118, as shown in FIG. 7A.

[0113] Specifically, as shown in FIG. 7A, when the length L21 of the guide sleeve (insertion guide portion) 122G in the pipe axis O2 direction is set such that L21 < L14 with respect to the length dimension L14 from the position corresponding to the length L21 of the guide sleeve 122G to the upper bottom surface 118A of the tool mounting recess 118, when constructing, the construction tool (not shown) can be inserted up to the upper bottom surface 118A to perform efficient and stable construction.

[0114] Further, when the length L21 of the guide sleeve (insertion guide portion) 122G is set such that L21 ≦ L15 with respect to the length dimension L15 to the lower end portion 112T of the outer cylinder portion 112L, at least until the construction is completed, the construction tool (not shown) can be engaged with the tool mounting recess 118 for construction. Note that, for example, a dedicated tool that does not interfere with the guide sleeve 122G may be mounted on the tool mounting recess 118 for construction. When constructing with such a dedicated tool, it goes without saying that the lower end portion 122T of the guide sleeve (insertion guide portion) 122G may be located below the lower end portion 122T of the outer cylinder portion 112L.

[0115] Also, in the siphon drain member (drain member) 200, instead of lengthening the outer cylinder portion 112L of the lower drain member 210, by lengthening the vertical dimension of the outer cylinder diameter-reduced portion 213, the vertical position of the lower end portion 122T of the guide sleeve (insertion guide portion) 122G and the lower end portion 112T of the outer cylinder portion 112L or the upper bottom surface 118A of the tool mounting recess 118 may be adjusted. In this case, when the dimension from the lower end portion 112T of the outer cylinder portion 112L to the lower surface 114A of the stepped portion (protruding portion) 114 is made to match the length of the receiving portion such as a joint (elbow, etc.) connected to the lower drain member 110, it becomes possible to lengthen the vertical dimension of the outer cylinder diameter-reduced portion 213 and expand the diameter D0 of the opening of the receiving hole 111H shown in FIG. 4C. As a result, the diameter D2 of the dropping port portion 121H formed in the upper part of the inner cylinder diameter-reduced portion 123 of the upper drain member 220 can be expanded, the diameter D1 of the dropping port portion 121H can be increased, and the curvature of the outer cylinder diameter-reduced portion 113, that is, the upper surface 123A, can be made smaller to form a smooth (gentle) curved surface shape.

[0116] According to the siphon drain member 200 of the second embodiment, the upper drain member 220 is provided with a guide sleeve 122G formed on the lower part of the inner tube portion 122, so that the inner tube portion 122 can be efficiently and stably inserted toward the inside of the outer tube portion 112L without the lower drain member 210 coming into contact with the inner surface of the outer tube reduced diameter portion 213 or the step portion (protrusion) 214.

[0117] Furthermore, according to the siphon drain member 200, the lower end 122T of the guide sleeve 122G is positioned above the upper bottom surface 118A of the tool mounting recess 118, so that when assembling and installing the drain member 200, an installation tool (not shown) can be inserted all the way to the upper bottom surface 118A, allowing for efficient and stable installation.

[0118] Furthermore, according to the siphon drain member 200, the length L21 of the guide sleeve 122G in the pipe axis O (O1, O2) direction is set to be shorter than the length L14 of the outer tube portion 112L of the lower drain member 210 in the pipe axis O2 direction, thereby preventing the guide sleeve 122G from being exposed downward from the outer tube portion 112L.

[0119] Furthermore, according to the siphon drain member 200, the lower drain member 210 has a step portion (protrusion) 214 that protrudes outwardly below the outer tube reduced diameter portion 213, so that the lower surface 214A of the step portion 214 abuts against the end face of the first receiving portion 21 of the first elbow portion (downstream joint) 20 connected to the downstream side of the lower drain member 210, thereby suppressing movement of the lower drain member 210 and the first elbow 20 relative to each other. As a result, the relative positions of the siphon drain member 200 and the first elbow 20 can be set accurately and efficiently.

[0120] <Third embodiment> Hereinafter, a third embodiment of the present invention will be described with reference to FIGS. 8A and 8B. Fig. 8A is a longitudinal sectional view illustrating a schematic configuration of a siphon drain member according to a third embodiment in an assembled state, and Fig. 8B is a longitudinal sectional view illustrating the disassembled state. Note that Figs. 8A and 8B are simplified views of the siphon drain member with the siphon portion omitted. 8A and 8B, reference numeral 300 denotes a siphon drain member (drain member).

[0121] As shown in FIGS. 8A and 8B, the siphon drain member (drain member) 300 includes, for example, a lower drain member 310, an upper drain member 220, and a siphon portion (not shown) disposed above the upper drain member 220. That is, the siphon drain member (drain member) 300 is configured, for example, by combining a lower drain member 310 having an insertion guide portion (continuously reducing inner diameter surface) 113G and an upper drain member 220 having a guide sleeve (insertion guide portion) 122G. The upper drain member 220 is similar to that of the first and second embodiments, so it is given the same reference numerals and the description thereof will be omitted.

[0122] 8A and 8B, the lower drain member 310 includes, for example, a lower flange portion 111 disposed on the lower surface 11B of the eaves gutter 10, an outer cylinder portion 112L formed below the lower flange portion 111 and extending downward, an outer cylinder reduced diameter portion 113 connecting the lower flange portion 111 and the outer cylinder portion 112L, and an inner peripheral thread portion 115 formed on the inner peripheral surface of the outer cylinder portion 112L. The lower drain member 310 also includes an insertion guide portion (continuous reduced inner diameter surface) 113G formed on the inner peripheral surface of the outer cylinder reduced diameter portion 113. The lower drain member 310 differs from the lower drain member 110 according to the first embodiment in that it includes an outer tubular portion 112L according to the second embodiment instead of the outer tubular portion 112. Since the rest of the configuration is similar to that of the first embodiment, the same reference numerals are used and the description thereof will be omitted.

[0123] Although the length L21 of the guide sleeve (insertion guide portion) 122G can be set arbitrarily, for example, it is preferable to set the length L21 of the guide sleeve 122G longer than the height dimension L16 of the outer tube reduced diameter portion 113 starting from the upper surface 111A of the lower flange portion 111 shown in Fig. 8A. By setting L21 > L16, the guide sleeve (insertion guide portion) 122G can be smoothly inserted into the outer tube portion 112.

[0124] In addition, in the siphon drain member (drain member) 300, the vertical position of the lower end 122T of the guide sleeve (insertion guide portion) 122G and the lower end 112T of the outer tube portion 112L or the upper bottom surface 118A of the tool mounting recess 118 may be adjusted by lengthening the vertical dimension of the outer tube reduced diameter portion 113 instead of lengthening the outer tube portion 112L of the lower drain member 310.

[0125] In this case, it is possible to increase the vertical dimension of the outer tube reduced diameter portion 113 and increase the diameter D0 of the opening of the receiving hole 111H shown in Figure 4C. As a result, it is possible to increase the diameter D2 of the drop port portion 121H formed at the top of the inner tube reduced diameter portion 123 of the upper drain member 220, increase the diameter D1 of the drop port portion 121H, and reduce the curvature of the outer tube reduced diameter portion 113, i.e., the upper surface 123A, to form a smooth (gentle) curved shape.

[0126] According to the siphon drain member 300 of the third embodiment, the lower drain member 310 has an insertion guide portion (continuously reducing inner diameter surface) 113G, and the upper drain member 220 has a guide sleeve (insertion guide portion) 122G, so that the lower drain member 310 and the upper drain member 220 can be assembled efficiently and stably.

[0127] <Fourth embodiment> Hereinafter, the fourth embodiment of the present invention will be described with reference to FIGS. 9A to 9C. Fig. 9A is a vertical cross-sectional view showing the schematic configuration of a siphon drain member according to a fourth embodiment in an assembled state, and Fig. 9B is a vertical cross-sectional view showing the disassembled state. Fig. 9C is a vertical cross-sectional view showing the schematic configuration of a positioning edge portion formed on an upper drain member. Figs. 9A and 9B are simplified views of the siphon drain member with the siphon portion omitted.

[0128] 9A and 9B, reference numeral 400 denotes a siphon drain member (drain member), reference numeral 320 denotes an upper drain member, reference numeral 321 denotes an upper flange portion, and reference numeral 321E denotes a positioning edge portion (bent recess).

[0129] As shown in Figures 8A and 8B, the siphon drain member (drain member) 400 includes, for example, a lower drain member 110, an upper drain member 320, and a siphon portion (not shown) disposed above the upper drain member 320. The lower drain member 110 is similar to that of the first embodiment, so it is given the same reference numerals and the description thereof will be omitted.

[0130] As shown in Figures 9A and 9B, the upper drain member 320 includes, for example, an upper flange portion 321 disposed on the upper surface 11A of the bottom plate 11 and having a drop portion 121H formed on its inner periphery, an inner tube portion 122 formed below the upper flange portion 321 and extending downward, an inner tube reduced diameter portion 123 connecting the upper ends of the upper flange portion 121 and the inner tube portion 122 and reducing in diameter as it extends downward, and an outer peripheral thread portion 125 formed on the outer periphery of the inner tube portion 122.

[0131] Moreover, the upper drain member 320 includes a positioning edge portion (bent recess) 321E disposed on the lower surface 321B of the upper flange portion 321. 9C, the positioning edge portion (bending recess) 321E is formed, for example, at a position corresponding to the peripheral portion of the pilot hole 11H formed in the bottom plate 11 of the eaves gutter 10 on the lower side surface 321B of the upper flange portion 321. Specifically, it is formed at a position corresponding to the upper surface corner portion 11E of the bottom plate 11 of the peripheral portion of the pilot hole 11H, and if the pilot hole 11H has a circular shape, the positioning edge portion (bending recess) 321E is formed into a circle with a diameter substantially the same as or slightly smaller than that of the pilot hole 11H. It is preferable that the positioning edge portion (bending recess) 321E is located at the same position as the upper corner portion 11E of the bottom plate 11, but it may also be located near the peripheral edge of the pilot hole 11H, where the flat surface on the outer periphery is stably positioned on the upper surface of the bottom plate with adhesive or the like sandwiched therebetween.

[0132] Further, the positioning edge portion (bent recess) 321E is formed by bending the boundary between the flat lower side surface (flat surface) 321B of the upper flange portion 321 located on the outer periphery side of the pilot hole 11H and the protruding outer periphery surface (protruding surface) 323B of the inner cylinder reduced diameter portion 323 located on the inner periphery side and protruding downward in a cross section including the tube axis O2. In other words, the positioning edge portion (bent recess) 321E is formed at the connection portion between the lower side surface (flat surface) 321B of the upper flange portion 321 and the protruding outer periphery surface (protruding surface) 323B of the inner cylinder reduced diameter portion 323. Moreover, the positioning edge portion 321E is formed around the entire circumference of the pilot hole 11H in the circumferential direction.

[0133] Here, the positioning edge portion (bent recess) 321E refers to a recess in which the intersection angle on the lower side between the flat surface and the protruding surface (the tangent direction at the boundary if the protruding surface is curved) is greater than 90°. The intersection angle on the lower side is preferably 120° or more, and more preferably 150° or more. In order to stably hook onto the upper corner of the pilot hole 11H, the intersection angle is preferably 160° or less, for example.

[0134] The positioning edge portion (bent recess) 321E hooks onto the upper surface corner portion 11E formed on the upper surface 11A of the peripheral portion of the pilot hole 11H formed in the bottom plate 11, thereby suppressing misalignment of the upper drain member 320 with respect to the pilot hole 11H and enabling the upper drain member 320 to be positioned.

[0135] According to the siphon drain member 400 of the fourth embodiment, the upper drain member 320 is provided with a positioning edge portion (bent recess) 321E, so that a positioning step portion 126 based on the inner surface (inner wall surface) of the pilot hole 11H is not required, and therefore adhesive applied to the lower surface 121B of the upper flange portion 121 is prevented from dripping onto the inner surface of the pilot hole 11H or the lower surface of the bottom plate 11. As a result, the drain member 400 can be stably positioned relative to the pilot hole with high quality.

[0136] Furthermore, according to the siphon drain member 400, since the lower drain member 110 is provided with an insertion guide portion (continuously reducing 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.

[0137] <Fifth embodiment> Hereinafter, a fifth embodiment of the present invention will be described with reference to FIGS. 10A and 10B. Fig. 10A is a longitudinal sectional view illustrating a schematic configuration of a siphon drain member according to a fifth embodiment in an assembled state, and Fig. 10B is a longitudinal sectional view illustrating the same in an exploded state, in which the siphon portion is omitted in Figs. 10A and 10B. 10A and 10B, reference numeral 500 denotes a siphon drain member (drain member), and reference numeral 420 denotes an upper drain member.

[0138] As shown in FIGS. 10A and 10B, siphon drain member (drain member) 500 includes, for example, a lower drain member 310, an upper drain member 420, and a siphon portion (not shown) disposed above the upper drain member 420. The lower drain member 310 is similar to that of the third embodiment, and therefore the same reference numerals are used and the description thereof is omitted.

[0139] As shown in Figures 10A and 10B, the upper drain member 420 includes, for example, an upper flange portion 321 disposed on the upper surface 11A of the eaves gutter 10 and having a drop opening portion 121H formed on its inner periphery, an inner tube portion 122 formed below the upper flange portion 321 and extending downward and having an outer periphery thread portion 125 formed on its outer periphery, an inner tube reduced diameter portion 123 connecting the upper ends of the upper flange portion 121 and the inner tube portion 122 and reducing in diameter as it extends downward, and a guide sleeve (insertion guide portion) 122G formed on the lower portion of the inner tube portion 122. Moreover, the upper drain member 420 includes a positioning edge portion (bent recess) 321E disposed on the lower surface 321B of the upper flange portion 321.

[0140] The upper drain member 420 differs from the upper drain member 320 in that it includes a guide sleeve (insertion guide portion) 122G formed on the lower portion of the inner cylindrical portion 122. The rest is similar to the fourth embodiment, so the same reference numerals are used and the description will be omitted.

[0141] According to the siphon drain member (drain member) 500 of the fifth embodiment, the lower drain member 310 is provided with an insertion guide portion (continuously reducing inner diameter surface) 113G, and the upper drain member 420 is provided with a guide sleeve (insertion guide portion) 122G, so that the upper drain member 420 can be efficiently and stably inserted into the lower drain member 310.

[0142] Moreover, according to the siphon drain member 500, since the upper drain member 420 is provided with the positioning edge portion (bent recess) 321E, the drain member 500 can be stably positioned with high quality relative to the pilot hole 11H.

[0143] <Other embodiments> The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the invention.

[0144] For example, in the above embodiment, the drain member is siphon drain member 100 equipped with siphon portion 150, but it is possible to arbitrarily set whether or not the drain member is equipped with siphon portion 150, and the drain member may be configured not to be equipped with siphon portion 150. The same applies to siphon drain members 200, 300, 400, and 500. Furthermore, the combination of the lower drain members 110, 210, 310 and the upper drain members 120, 220, 320 exemplified in the above embodiments may be set arbitrarily.

[0145] In addition, in the above embodiment, the insertion guide portion is described as being composed of the insertion guide portion (continuously reducing inner diameter surface) 113G formed on the outer tube reducing diameter portion 113 of the lower drain member 110 and the guide sleeve (insertion guide portion) 122G extending to the lower part of the inner tube portion 122 of the upper drain member 120, but the configuration of the insertion guide is not limited to the continuous reducing inner diameter surface 113G and the guide sleeve 122G and may be set arbitrarily.

[0146] In the above embodiment, the lower drain member reduced diameter portion 113, 213 of the lower drain member 110, 210, 310 is formed in a substantially conical shape in which the cross section including the tube axis O1 is linearly reduced in diameter, but the configuration of the lower drain member reduced diameter portion 113, 213 can be set arbitrarily. For example, the cross section including the tube axis O1 may be curved in diameter or may be formed of a slope that combines straight lines and curves. Also, a bulge may be formed within a range that does not cause the inner tube portion 122 or the guide sleeve 122G to get caught.

[0147] In the above embodiment, the guide sleeve 122G formed below the inner tube portion 122 is described as being straight with the same diameter up to the tip, but the shape of the guide sleeve can be set arbitrarily. For example, the tip (lower) side may be tapered with a reduced diameter, or may be configured as a combination of a straight cylindrical portion and a tapered shape. Also, a bulge may be formed within a range that does not cause any catching between the outer tube reduced diameter portion 113 and the like.

[0148] In addition, in the above embodiment, the case has been described in which the length L21 of the guide sleeve 122G is set longer than the height dimension L13 from the upper surface 111A of the lower flange portion 111 to the upper surface 214B of the positioning step portion 214 shown in FIG. 7A, or the height dimension L16 to the lower end portion of the outer tube reduced diameter portion 113 shown in FIG. 8A. However, whether or not the length L21 of the guide sleeve 122G is set longer than the height dimension L13 to the upper surface 214B of the positioning step portion 214 or the height dimension L16 of the outer tube reduced diameter portion 113 may be set arbitrarily.

[0149] In the above embodiment, the length L21 of the guide sleeve 122G to the lower end 122T is shorter than the length L14 to the lower end 112T of the outer tube portion 112L, but the length L21 of the guide sleeve 122G can be set arbitrarily with respect to the length L14 to the lower end 112T of the outer tube portion 112L, and the length L21 of the guide sleeve 122G may be set longer than the length L14 of the outer tube portion 112L. Similarly, the length to the lower end 122T of the inner tube portion 122 can be set arbitrarily.

[0150] In the above embodiment, the length L21 of the guide sleeve 122G to the lower end 122T is shorter than the length L15 to the upper bottom surface 118A of the tool mounting recess 118, but the length L21 of the guide sleeve 122G can be set arbitrarily. For example, it may be set longer than the length L14 to the lower end 112T of the outer tubular portion 112L.

[0151] In the above embodiment, the upper drain members 120 and 220 are provided with the positioning step 126, and the upper drain members 320 and 420 are provided with the positioning edge (bending recess) 321E, but whether the upper drain members are provided with the positioning step 126 and the positioning edge (bending recess) 321E may be set arbitrarily. For example, as shown in Fig. 9D, when the connection portion 324 between the upper flange portion 321 and the upper surface 323A of the upper drain member 320C is bent and connected, if the upper drain member 320C is provided with the positioning edge (bending recess) 321E, stress is likely to concentrate between the upper and lower bent portions because there are bent portions above and below the flange portion 321. Therefore, when the connection portion 324 between the upper flange portion 321 and the upper surface 323A of the upper drain member 320C is connected in a bent manner, it is not necessary to provide a positioning edge portion (bent recess) 321E, and the connection portion 325 between the lower surface (flat surface) 321B of the upper flange portion 321 and the protruding outer peripheral surface (protruding surface) 323B of the inner tube reduced diameter portion 323 may be connected by a smooth arc without any steps or recesses.

[0152] In addition, in the above embodiment, a positioning step portion 214 is formed on the lower side of the outer tube reduced diameter portion 213 of the lower drain member 210 to correspond to the receiving portion of a coupling member such as an elbow and set the relative positional relationship between them, and an upper surface 214B of the positioning step portion 214 serves as a step surface. However, for example, by providing an excess material portion on the inner surface side of the positioning step portion 214, the positioning step portion 214 may be configured so that the step portion is formed only by the lower surface 214A, and no step surface is formed on the upper surface 214B of the positioning step portion 214.

[0153] In the above embodiment, the upper flange portion 121, 321 of the upper drain member 120, 320 is formed in a ring-shaped flat plate shape (a shape that extends continuously around the entire circumference in the circumferential direction) in a plan view. However, as in the upper drain member 120A, 320A shown in Fig. 14A to Fig. 14E, the upper flange portion 121, 321 may be formed in a ring shape with a part cut out. There may be at least one notch 127 provided in the upper flange portion 121, 321, and there may be multiple notches 127. When multiple notches are provided, it is preferable to provide them at equal intervals in the circumferential direction of the upper flange portion 121, 321. Furthermore, for example, the upper flange portions 121, 321 of the upper drain members 120, 320 may be formed in a gear shape in plan view or in a discontinuous ring shape in plan view. In this case, the locations of the cutouts are arbitrary. When forming the notch 127, the notch 127 may be provided in the upper flange portion 121, 321 at a location where the vertical rib 155 is formed. However, in order to maintain the strength of the vertical rib 155, it is preferable to form the notch 127 in the upper flange portion 121, 321 at a location where the vertical rib 155 is not formed. In order to allow rainwater to smoothly flow into the drop port portion 121H, it is preferable to form a notch 127 in a direction perpendicular to the pipe axis of the upper drain members 120A and 320A. Furthermore, for example, the upper flange portion 121, 321 of the upper drain member 120, 320 may be a polygon such as a square, pentagon, or hexagon in plan view. In this case, it is preferable that the end of the outer edge side of the vertical rib 155 coincides with the vertex of the polygon. For example, when there are five vertical ribs 155, the upper flange portion 121, 321 is a pentagon in plan view, and when there are six vertical ribs 155, the upper flange portion 121, 321 is a hexagon in plan view, and the flange portion 121, 321 and the vertical rib 155 are arranged so that the end of the outer edge side of the vertical rib 155 is located at each vertex of the polygonal upper flange portion 121, 321. In addition, in the case of a polygonal shape, each vertex may be sharply pointed or chamfered to have a circular arc shape.

[0154] Furthermore, the cutout range (size of cutout 127) in upper drain members 120A and 320A is arbitrary. However, in order to prevent upper drain members 120A and 320A from shifting with respect to pilot hole 11H, it is preferable that the cutout range (size of cutout 127) be set to the range from the circumscribing circle of upper flange portions 121 and 321 to positioning step portion 126 or positioning bent portion 321E. As shown in upper drain members 120B, 320B in Figures 15A to 15E, notch 127 may be cut out toward the center of pilot hole 11H, rather than positioning step 126 or positioning bent portion 321E. In this case, the presence of notch 127 makes it possible to eliminate a step caused by upper flange portions 121, 321 in bottom plate 11 of eaves gutter 10. As a result, rainwater accumulating in bottom plate 11 is easily allowed to flow into drop port portion 121H.

[0155] In addition, the diameter D1 of the inner upper end portion of the outer tube narrowing portion 113 may be smaller than the diameter D0 of the pilot hole 11H as shown in FIG. 6A, or may be larger than the diameter D0 of the pilot hole 11H as shown in FIG. 7A, but is not limited to this, and the diameter D1 of the inner upper end portion of the outer tube narrowing portion 113 may be the same as the diameter D0 of the pilot hole 11H. For example, diameter D1 of the inner upper end portion of the outer tube reduced diameter portion 113 may be larger than the inner diameter of step portion 126 and the diameter of positioning edge portion (bending recess) 321E so that there is no interference between positioning step portion 126 of the upper drain member or the outer surface of inner tube reduced diameter portion 123 and the inner upper end portion of outer tube reduced diameter portion 113. However, when the siphon drain member is installed in the eaves gutter, so long as there is no interference between the positioning step portion 126 of the upper drain member or the outer surface of the inner tube reduced diameter portion 123 and the inner upper end portion of the outer tube reduced diameter portion 113, diameter D1 of the inner upper end portion of the outer tube reduced diameter portion 113 may be smaller than diameter D0 of the pilot hole 11H, the inner diameter of step portion 126, and the diameter of the positioning edge portion (bent recess) 321E. In addition, the upper end of the inner circumference of the outer tube reduced diameter portion 113 does not have an acute apex, and may be chamfered or arc-shaped.In this case, the inner terminal end when the flat surface opposite the bottom surface of the eaves gutter of the lower flange portion is viewed in a plane is regarded as the upper end of the inner circumference of the outer tube reduced diameter portion 113.

[0156] In addition, in each drawing of the above embodiment, the lower drain member 110 is shown in a state in which the lower flange portion 111, the outer tube portion 112 formed below the lower flange portion 111 and extending downward, and the outer tube reduced diameter portion 113 connecting the lower flange portion 111 and the outer tube portion 112 are molded as one unit, but the lower flange portion and the outer tube portion may be molded as separate members, and the lower flange member adhesively joined to the bottom surface of the eaves gutter and the cylindrical outer tube member having an inner peripheral thread portion on the inner surface may be connected to each other by adhesive joining or a fitting structure. In the case of a fitting structure, the lower flange member and the outer tube member are connected by fitting a fitting portion provided on the outer surface of the outer tube member and having a concave-convex shape, etc., and a fitting portion extending from the lower flange member and having a concave-convex shape that engages with the fitting portion. In this case, the location where the lower flange member and the outer tube member are connected does not have to be the upper end of the outer tube member, and any outer peripheral surface of the outer tube member may be connected to any location of the lower flange member. In addition, the upper end of the outer tube member in this case may be provided with a guide tube portion as an insertion guide portion that extends to the bottom surface side of the eaves gutter to an extent that it does not contact the outer surface of the inner tube reduced diameter portion of the upper drain member, and the lower end of the inner tube portion of the upper drain member is inserted into this guide tube portion, thereby suppressing the inclination of the upper drain member. The guide tube portion may be shaped so that its diameter is reduced from the upper end toward the bottom, and the outer diameter of the lower part of the guide tube portion is smaller than the diameter of the pilot hole 11H in the bottom surface of the eaves gutter. In this case, either the outer tube member or the lower drain member may be connected to the elbow or downspout, and a receiving port or spigot to which the elbow or downspout can be connected may be provided at the lower end of the outer tube member or the lower drain member. In this case, there may not be an outer tube tapered portion connecting the lower flange member and the outer tube member, and rather than a shape that reduces in diameter as it extends downward, the lower flange member or the outer tube member may be provided with a member connecting the lower flange member and the outer tube member.

[0157] In addition, within the scope of the invention, the components in the above-described embodiments may be replaced with well-known components as appropriate, and the above-described embodiments may be combined as appropriate. [Explanation of symbols]

[0158] 1, 1A, 1B Rain gutter piping structure (piping structure) 10 Gutters 11 Bottom plate 11H pilot hole 11E Top corner 12 Side Panel 20 Elbow 30 Downpipe 100, 200, 300, 400, 500 Siphon drain parts (drain parts) 110, 210, 310 Lower drain member 111 Lower flange 111H Receiving hole 112, 112L Outer cylinder 112H Outer cylinder inner hole 113 Outer tube narrowed diameter part 113G Insertion guide section (continuously tapered inner diameter surface) 115 Inner circumference thread 213 Outer tube narrowing part 214 Step (protruding part) 120, 120A, 120B, 220, 320, 320A, 320B, 320C, 420 Upper drain member 121, 321 Upper flange 121B, 321B Lower surface of upper flange 121H Drop-out section 122 Inner cylinder 122H Inner cylinder inner circumferential hole 122G Guide sleeve (guide tube part, insertion guide part) 123 Inner cylinder narrowing part 123D Step 125 Outer thread 126 Positioning step 321E Positioning edge part (positioning bend part) 150 Siphon Section

Claims

1. A drain member having a bottom plate and side plates extending upward from both ends of the bottom plate in a width direction, the drain member being attached to an eaves gutter having a pilot hole formed in the bottom plate, a lower drain member including: a lower flange portion disposed on the lower surface of the bottom plate and having an inlet formed on its inner circumference; an outer tubular portion formed below the lower flange portion and extending downward; an outer tubular reduced diameter portion connecting an upper end of the lower flange portion and the outer tubular portion and reducing in diameter as it extends downward; and an inner circumferential thread portion formed on the inner circumferential surface of the outer tubular portion; an upper flange portion disposed on the upper surface of the bottom plate and having a drop portion formed on its inner periphery; an inner tubular portion formed below the upper flange portion, extending downward and inserted into the outer tubular portion; an inner tubular reduced diameter portion connecting an upper end of the upper flange portion and the inner tubular portion and reducing in diameter as it extends downward; and an outer periphery thread portion formed on the outer periphery of the inner tubular portion and screwed into the inner periphery thread portion. An upper drain member having Equipped with The upper drain member is a guide sleeve extending downward from a lower end of the outer peripheral threaded portion and shorter than a length to a lower end of the outer cylindrical portion; a linear bent recess portion disposed around the entire circumference of the lower surface of the upper flange portion at a position corresponding to a peripheral edge of the pilot hole, the linear bent recess portion being formed by bending at a boundary between a flat surface on an outer circumferential side and a protruding surface on an inner circumferential side that protrudes downward; A cover member disposed above the pilot hole; A rib is disposed on the cover member, The lower drain member is a protrusion extending toward an outer circumferential side at an upper portion of the outer tubular portion and corresponding to a socket portion of a coupling member to which the outer tubular portion is connected; The diameter of the inner periphery of the reduced diameter portion of the outer cylinder is larger than the diameter of the pilot hole. A drain member characterized by:

2. A drain member having a bottom plate and side plates extending upward from both ends of the bottom plate in a width direction, the drain member being attached to an eaves gutter having a pilot hole formed in the bottom plate, a lower drain member including: a lower flange portion disposed on the lower surface of the bottom plate and having an inlet formed on its inner circumference; an outer tubular portion formed below the lower flange portion and extending downward; an outer tubular reduced diameter portion connecting an upper end of the lower flange portion and the outer tubular portion and reducing in diameter as it extends downward; and an inner circumferential thread portion formed on the inner circumferential surface of the outer tubular portion; an upper flange portion disposed on the upper surface of the bottom plate and having a drop portion formed on its inner periphery; an inner tubular portion formed below the upper flange portion, extending downward and inserted into the outer tubular portion; an inner tubular reduced diameter portion connecting an upper end of the upper flange portion and the inner tubular portion and reducing in diameter as it extends downward; and an outer periphery thread portion formed on the outer periphery of the inner tubular portion and screwed into the inner periphery thread portion. An upper drain member having Equipped with The upper drain member is a guide sleeve extending downward from a lower end of the outer peripheral threaded portion and shorter than a length to a lower end of the outer cylindrical portion; a linear bent recess portion disposed around the entire circumference of the lower surface of the upper flange portion at a position corresponding to a peripheral edge of the pilot hole, the linear bent recess portion being formed by bending at a boundary between a flat surface on an outer circumferential side and a protruding surface on an inner circumferential side that protrudes downward; A cover member disposed above the pilot hole; A guide extending axially downward in a central portion of the cover member; a plurality of vertical ribs arranged on an upper surface of the upper flange portion and connected to the cover member (excluding those in which the lower surface of the guide and the vertical rib are connected); The induction guide and the longitudinal rib are The lower drain member is a protrusion extending toward an outer circumferential side at an upper portion of the outer tubular portion and corresponding to a socket portion of a coupling member to which the outer tubular portion is connected; The diameter of the inner periphery of the reduced diameter portion of the outer cylinder is larger than the diameter of the pilot hole. A drain member characterized by:

3. The drain member according to claim 1 , wherein the rib comprises a plurality of ribs spaced apart from one another in the circumferential direction.

4. The drain member according to any one of claims 1 to 3, A drain member, characterized in that the length of the guide sleeve in the pipe axial direction is longer than the height dimension from the upper surface of the lower flange portion to the upper surface of the protrusion.

5. The drain member according to any one of claims 1 to 4, The upper drain member is A drain member comprising a continuously tapered outer peripheral surface formed on an outer peripheral surface of the inner cylindrical tapered portion, the continuously tapered outer peripheral surface being continuously tapered in diameter from the bent recess to the outer peripheral surface of the inner cylindrical portion.

6. The drain member according to any one of claims 1 to 5, The outer tubular portion of the lower drain member has a recess formed therein, the recess being recessed upward from a lower end thereof, The lower end of the guide sleeve is A drain member characterized in being positioned above an upper bottom surface of the recess.

7. An eaves gutter comprising a bottom plate and side plates extending upward from both ends of the bottom plate in the width direction, and a drain member according to any one of claims 1 to 6 attached to a pilot hole formed in the bottom plate.

8. With eaves gutter, The drain member according to any one of claims 1 to 6, which is installed on a bottom plate of the eaves gutter; A downspout comprising: a downspout connected to the outer tubular portion.

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