Siphon drain components, eaves gutters, rain gutters, and buildings

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 inside large eaves gutters placed at the eaves of buildings in large facilities such as factories and shopping centers (see, for example, Patent Document 1).

[0003] Such siphon drain members generally comprise a drain member that includes 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 top. 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 in a variety of applications.

[0004] 16A, the drain member 900 includes, for example, a lower drain member 910 arranged on the underside of the bottom plate (eaves gutter) 11 (10), and an upper drain member 920 arranged above the eaves gutter 10. The siphon drain member is structured to include, for example, a siphon portion 950 arranged above 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 circumferential 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 circumferential surface of the outer tube portion 912.

[0006] The upper drain member 920 has, for example, an upper flange portion 921 having a drop-off portion formed on its inner periphery, 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 side 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 pipe axes O1 and 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] Japanese Patent Application Publication No. 2019-007340 Summary of the Invention [Problem to be solved by the invention]

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

[0011] 16B, gaps may be formed at intervals in the circumferential direction in the inner circumferential thread portion 915 formed on the inner circumferential surface of the outer cylindrical portion 912. Therefore, when the inner cylindrical portion 922 is inserted into the outer cylindrical portion 912 to assemble the lower drain member 910 and the upper drain member 920, the outer circumferential thread portion 925 may enter the gap formed in the inner circumferential thread portion 915, and the inner circumferential thread portion 915 and the outer circumferential thread portion 925 may be fitted together with the pipe axis O1 and the pipe axis O2 tilted. If the inner peripheral thread portion 915 and the outer peripheral thread portion 925 are engaged with the pipe axes O1 and O2 tilted, the pipe axes O1 and O2 of the lower drain member 910 and the upper drain member 920 will not be aligned 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, resulting in water leakage. Therefore, there is a need for 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 and efficiently positioned in a predetermined position.

[0012] The present invention has been made in consideration of these circumstances, and its object is to provide a drain member in which the inner cylindrical portion of the upper drain member can 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 drain member that has a bottom plate and side plates extending upward from both ends of the bottom plate in the width direction, and is attached to an eaves gutter with a pilot hole formed in the bottom plate, the drain member having a lower flange portion that is disposed on the underside of the bottom plate and has a receiving port formed on its inner periphery, an outer tubular portion that is formed below the lower flange portion and extends downward, an outer tubular tapered portion that connects the lower flange portion and an upper end of the outer tubular portion and tapered downward, and an inner circumferential thread portion that is formed on the inner circumferential surface of the outer tubular portion, and a drain member that is disposed on the upper surface of the bottom plate and has a drop opening formed on its inner periphery. 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 threadedly engaging with 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 this 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 cylindrical portion is guided toward the inner peripheral side of the outer cylindrical 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 continuously taperes 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 tapered portion of the outer tube and is composed of a continuously tapered inner surface that continuously taperes down to the inner surface of the outer tube, 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 tapered portion of the outer tube. As a result, the inner cylindrical portion can be guided efficiently and stably toward the inside of the outer cylindrical portion.

[0017] Here, "a continuously tapered inner circumferential surface formed on the inner circumferential surface of the tapered outer tube portion and tapering 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 configured with straight or curved lines, or a combination of straight and curved lines, all the way to the upper end of the outer tube portion. This means that the inner circumferential surface of the tapered outer tube portion does not have any steps or bulges that could cause interference. In other words, it is desirable that at least when the inner circumferential surface of the tapered outer tube portion reduces in diameter, it is always accompanied by a change in position in the tube axial direction. Note that bulges that do not cause interference are also acceptable.

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

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

[0020] Here, the "lower end of the outer thread portion" refers to the position where the height of the outer thread portion is zero. Furthermore, a "guide sleeve whose lower outer peripheral surface has the same or a smaller diameter than its upper outer peripheral surface" refers to, for example, a guide sleeve that is formed in a straight cylindrical shape with the same diameter from the top to the bottom, a tapered shape with the lower side having a smaller diameter than the upper side, or a shape that combines a straight shape and a tapered shape, where the diameter is larger toward the outer peripheral side than the upper side from the top to the bottom of the guide sleeve, and there is no flat portion (step or protrusion) facing downward due to the guide sleeve being formed in a larger diameter toward the outer peripheral side than the upper side. Note that a hill-like 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 pipe axis direction may be set to be longer than the length of the outer tube reduced diameter portion of the lower drain member in the pipe axis direction.

[0022] According to the drain member of this 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, so that 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 of the pipe may be set shorter than the length of the outer tubular portion of the lower drain member in the axial direction of the pipe.

[0024] According to the drain member of this invention, the length of the guide sleeve in the axial direction of the pipe is set shorter than the length of the outer tubular 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 tubular portion. As a result, when the drain member is constructed by inserting the upper drain member into the lower 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 that is recessed upward from the lower end, and the lower end portion of the guide sleeve may be positioned above the upper bottom surface of the recess.

[0026] According to the drain member of this 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 does not come into contact with the lower end surface of the guide sleeve, which does not interfere with the construction, and the drain member can be installed efficiently.

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

[0028] According to the drain member of this 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 that protrudes downward on the inner circumference, so there is no need for a positioning step that is inserted into the inner surface (inner wall surface) of the pilot hole and positions it based on the inner surface (inner wall surface), and therefore the positioning step, etc. does not come into direct contact with the inner surface of the pilot hole. Therefore, the adhesive applied to the underside of the upper flange is prevented from dripping into the pilot hole or through the pilot hole onto the inner circumferential surface 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 curved recess formed by bending at the boundary" refers to a recess that opens at the boundary between the flat surface and the protruding surface, with the intersection angle between the flat surface and the protruding surface (or the tangent direction at the boundary if the protruding surface is curved) on the lower side being greater than 90°. The intersection angle on the lower side is preferably 120° or greater, and more preferably 150° or greater. To ensure stable hooking into the upper corner of the pilot hole, the intersection angle is preferably 160° or less, for example.

[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 surface formed on the outer peripheral surface of the tapered inner tube portion, the diameter of which is continuously tapered to the outer peripheral surface of the inner tube portion.

[0032] According to the drain member of this invention, the upper drain member is provided with a continuously reduced diameter outer surface that is formed on the outer peripheral surface of the inner tube reduced diameter portion and that 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 efficiently and stably toward the inside of the outer cylindrical portion.

[0033] Here, "a continuously tapered outer surface formed on the outer surface of the tapered portion of the inner tube and tapering continuously to the outer surface of the inner tube" means that, in a cross section including the tube axis, the outer surface of the tapered portion of the inner tube is smoothly configured with straight or curved lines, or a combination of straight and curved lines, all the way to the upper end of the inner tube. This means that there are no steps on the outer surface of the tapered portion of the inner tube. In other words, it is desirable that at least when the outer surface of the tapered portion of the inner tube reduces in diameter, it is always accompanied by a change in position in the tube axial direction. Note that bulges that do not cause any catches are also acceptable.

[0034] (9) In the drain member described in any one of (1) to (8) above, the lower drain member may have a protrusion at the upper part of the outer tubular portion that extends toward the outer periphery and corresponds to a socket portion of a coupling member to which the outer tubular portion is connected.

[0035] According to the drain member of this invention, the lower drain member is provided with a protrusion formed on the outer peripheral surface of the reduced diameter portion of the outer tube, which protrusion corresponds 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 the coupling in the axial direction of the pipe can be set accurately and efficiently.

[0036] (10) A second aspect of the present invention is a siphon drain member, characterized by comprising a drain member described in any one of (1) to (8) above and a siphon portion arranged above 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, characterized by including the drain member according to any one of (1) to (8) above. [Effects 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 on the outer cylindrical portion of the lower drain member. [Brief explanation of the drawings]

[0040] [Figure 1] 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. FIG. [Figure 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. [Figure 3]FIG. 2 is a perspective view illustrating details of a siphon drain member according to the first embodiment. [Figure 4] 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. FIG. [Figure 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 the 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 an exploded state of the siphon drain member according to the first embodiment, illustrating the schematic configuration thereof. [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. 10 is a vertical cross-sectional view illustrating the assembled state of a siphon drain member according to a second embodiment of the present invention. [Figure 7B] FIG. 10 is a vertical cross-sectional view illustrating an exploded state of a schematic configuration of a siphon drain member according to a second embodiment. [Figure 8A] FIG. 10 is a vertical cross-sectional view illustrating the assembled state of a siphon drain member according to a third embodiment of the present invention. [Figure 8B] FIG. 10 is a vertical cross-sectional view illustrating an exploded state of a schematic configuration of a siphon drain member according to a third embodiment. [Figure 9A] FIG. 10 is a vertical cross-sectional view illustrating the assembled state of a siphon drain member according to a fourth embodiment of the present invention, illustrating the schematic configuration thereof. [Figure 9B] FIG. 10 is a vertical cross-sectional view illustrating an exploded state of a schematic configuration of a siphon drain member according to a fourth embodiment. [Figure 9C] FIG. 10 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. [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. 10 is a vertical cross-sectional view illustrating the assembled state of a siphon drain member according to a fifth embodiment of the present invention. [Figure 10B] FIG. 10 is a vertical cross-sectional view illustrating an exploded state of a schematic configuration of a siphon drain member according to a fifth embodiment. [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] FIG. 10 is a cross-sectional view of a different diameter tee that can be applied to a gutter piping structure. [Figure 12] FIG. 10 is a side view illustrating a first modified example of the gutter piping structure. [Figure 13A] FIG. 10 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. 10 is a bottom view of an upper drain member according to a first modified example and a second modified example. [Figure 14B] 14B is a cross-sectional view of the upper drain member according to the 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. FIG. [Figure 15A] FIG. 10 is a bottom view of an upper drain member according to a third and fourth modified examples. [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 arrow BB in FIG. 15A. FIG. [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 arrow BB in FIG. 15A. FIG. [Figure 16A] FIG. 10 is a longitudinal sectional view illustrating the assembled state of a drain member according to a conventional technique. [Figure 16B] FIG. 10 is a perspective view illustrating a schematic configuration of a screw structure of a siphon drain member according to the prior art. [Figure 16C] 10A and 10B are longitudinal sectional views illustrating problems that arise when assembling a drain member according to the prior art. DETAILED DESCRIPTION OF THE INVENTION

[0041] First Embodiment A first embodiment of the present invention will be described below 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. Figs. 2 to 5 are diagrams illustrating an outline of the siphon drain member according to the first embodiment. In the drawings, reference numeral 1 denotes the gutter piping structure (piping structure), reference numeral 10 denotes the gutter, reference numeral 11 denotes the bottom plate, reference numeral 12 denotes the side plate, and reference numeral 11H denotes the pilot hole. Reference numeral 100 denotes the siphon drain member (drain member), reference numeral 110 denotes the lower drain member, reference numeral 120 denotes the upper drain member, and reference numeral 150 denotes the siphon portion. Note that the shapes and the like are emphasized in the drawings 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 call 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 call 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 widthwise ends of the bottom plate 11, and is formed with a groove-shaped cross section when viewed along the longitudinal direction. In addition, 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 catch 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 vinyl chloride resin, ABS, or AES. The material from which the eaves gutter 10 is made can be set arbitrarily, and is not limited to synthetic resin, but may be made from, for example, an extruded metal product.

[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 coefficient of linear expansion by inserting a low-elasticity sheet such as a stretched PET resin sheet or iron sheet 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 vinyl 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 section 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 cover member 151 is, for example, a disk-shaped member that is circular in plan view and is disposed above the upper drain member 120. The cover member 151 is coaxial with the pipe axis of the upper drain member 120. The portion formed between the outer peripheral edge 151A of the 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 inlet opening 100A is located in a direction perpendicular to the horizontal plane, 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. 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 will be 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 will be 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, which will be described later, are adjusted so that the area of ​​the inflow opening 100A is larger than the opening area A1 of the drop opening 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 where it 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, positioned above and spaced apart from the drop opening 121H, and forms an inlet 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. Preferably, 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 lid member 151 in a plan view can be set arbitrarily, but it is preferable that it be disposed so as to close the opening of drop opening portion 121H and be set larger than the opening area of ​​drop opening portion 121H. Alternatively, it may be set equal to or smaller than the opening area of ​​drop opening portion 121H. Furthermore, for example, a through-hole may be formed in the cover 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 lid member 151 is smaller than 150% of the opening outer diameter R1 of downspout portion 121H, the water level in eaves gutter 10 will be lower than lid member 151, and there is a risk that lid member 151 will not come into contact with the inflowing water. Also, if the diameter of lid member 151 exceeds 200%, the proportion of the water flowing in from inlet opening 100A that collides with lid member 151 will increase, and the water level in eaves gutter 10 will become too high above 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 lid 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 discharged. Furthermore, by setting the upper limit at 170 mm or less, the fit is reduced, preventing the joints and supports from becoming larger.

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

[0059] Furthermore, gripping rib 156 is made up of rib main body 156A extending in the circumferential direction and extension portions 156B protruding outward from both ends of rib main body 156A. When attaching siphon drain member 100 to first elbow 20, for example, a rod-shaped member can be engaged between circumferentially adjacent gripping ribs 156, 156 and then rotated to tighten the members. Furthermore, since gaps are formed between the gripping ribs 156, 156, debris such as fallen leaves in the eaves gutter 10 can easily pass through, preventing it 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, with a plurality of guide guides 157 having curves that gradually extend downward as they approach the drain axis O (the center of the lid), and extending radially in the radial direction from the drain axis O. The guide guides 157 are intended to guide 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 by a funnel-shaped or cylindrical wall portion with holes formed at the top and bottom ends.

[0061] As shown in Fig. 3, the vertical ribs 155 connect the upper surface 121A of the upper drain member 120 to the outer periphery of the lower surface 151C of the cover member 151. In other words, the cover member 151 is supported from below by the multiple vertical ribs 155 and 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 on the inlet opening 100A and are curved and intersect with the radial direction in a plan view. In other words, the vertical ribs 155 have the function of rectifying the rainwater W that flows from the inlet opening 100A into the drop opening 121H.

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

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

[0064] Such a siphon drain member 100 is installed inside the eaves gutter 10 located at the eaves of a rain gutter piping structure 1 attached to a building of a large facility such as a factory or shopping center, and exhibits high drainage 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] First receiving portion 21 is formed with an inner diameter that allows it to be connected to lower drain member 110 of siphon drain member 100, and as shown in Figure 1, a receiving bottom surface 21A is formed at the connection portion with curved pipe portion 23, the diameter of which decreases toward curved pipe portion 23. This receiving bottom surface 21A abuts against the blank end of the inserted piping, making it possible to secure the relative position with respect to the piping.

[0067] In order to allow the rainwater W flowing in from the first receiving port 21 to flow smoothly without reducing its flow rate, it is preferable that the curved pipe section 23 is formed so that, when viewed in a cross section including the pipe axis (along the pipe axis), the radius of curvature of the outer wall section (the side with the smaller curvature) and the inner wall section is at least 64 mm and smaller than 125 mm. Furthermore, the second receiving portion 22 of the first elbow 20 is connected to the upstream end 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 downspout 30 by a second elbow 25.

[0069] Furthermore, it is preferable that the length of the call down pipe 24 from the upstream end to the downstream end 24B of the call down pipe 24 (call down 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 call gutter within the above-mentioned range, the rainwater W flowing down from the first elbow 20 can flow smoothly in a full state. A downstream end 24B of the inlet pipe 24 is connected to a first receiving port 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 drains 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 of the downspout 30 is connected to, for example, 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 keeping the length (height dimension) of the downspout within the above range, the siphon effect in the downspout 30 can be satisfactorily generated and maintained. As the downspout length increases, 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-off portion 121H, flows through the first elbow 20, the outlet gutter 24, the second elbow 25 and then flows down into the downspout 30. Then, the rainwater W that flows from the inlet pipe 24 into the downspout 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 downspout 30, filling it with water, causing a siphon phenomenon in the drop opening 121H, the inlet pipe 24, and the downspout 30, and causing the rainwater to be forcefully drained from the downspout 30 into 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, a second elbow 25A (different-diameter elbow) in which the diameter of the first socket 26 and the diameter of the second socket 27 are different may also be used. 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 cross section on a plane including the pipe axis of the curved pipe portion 28, the curvature of the inner peripheral portion and the outer peripheral portion of the curved pipe portion 28 gradually change and become smaller. At this time, the radii of curvature of the inner peripheral portion and the outer peripheral portion of the curved pipe portion 28 gradually increase. The diameter of the second elbow 25A increases from upstream to downstream.

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

[0075] Furthermore, the joint connecting the inlet pipe 24 and the downspout 30 is not limited to an elbow. For example, a tee 25B as shown in FIG. 11B may connect the inlet pipe 24 and the downspout 30. The tee 25B includes a third receptacle 29 in addition to a first receptacle 26 and a second receptacle 27. The second receptacle 27 and the third receptacle 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 receptacle 29. The lid is detachable from the third receptacle 29. The third receptacle 29 functions as a cleaning port. Note that a downspout that drains rainwater from a higher position may be connected 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, employing 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 confluence joint 31 (confluence portion) is provided in the downspout 30, as shown in FIG. 12. The confluence joint 31 is provided at a midpoint in the height direction of the downspout 30. The confluence joint 31 is, for example, a tee. At the confluence joint 31, rainwater from another downspout 10A joins with rainwater flowing down the downspout 30. When rainwater from another downspout 10A joins at a midpoint in the downspout 30, as in the gutter piping structure 1A, if the capacity of the downspout 30 is small, the downspout 30 is likely to fill up with water, and there is a risk that the rainwater will not be able to join at the confluence joint 31. 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 (expanding the diameter of the downspout 30), there will be a margin in the allowable flow rate in the downspout 30, ensuring that the rainwater can flow together.

[0077] In the gutter piping structure 1A shown in FIG. 12, rainwater flowing through the downspout 30 is drained into the rainwater manhole 160. The downspout 30 and the rainwater manhole 160 are connected via a third elbow 161 and a horizontal pipe 162. The lower end of the downspout 30 is buried underground. The third elbow 161 is connected to the lower end of the downspout 30. A first end of the horizontal pipe 162 is connected to the third elbow 161. A second end of the horizontal pipe 162 is disposed within the rainwater manhole 160. The third elbow 161 and the horizontal pipe 162 form the drainage pipe described above. By using a different diameter elbow as the second elbow 25A, rainwater flowing inside the downspout 30 does not become full and the flow rate is slowed. This prevents water from splashing out of the rainwater manhole 160.

[0078] Here, as in the gutter piping structure 1B shown in Fig. 13A, the third elbow 161A may be a different diameter elbow. As shown in Figs. 13A and 13B, the third elbow 161A, like the second elbow 25A, has a first socket 26, a second socket 27, and a curved pipe portion 28. The first socket 26 is connected to the lower end of the downspout 30. The second socket 27 is connected to the first end of the horizontal pipe 162. In this case, the flow velocity inside the third elbow 161A is slowed down, so that the water can be prevented from splashing out of the rainwater manhole 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 that constitute the siphon drain member 100 will be described with reference to FIGS. 6A to 6D. Fig. 6A is a longitudinal cross-sectional view illustrating the schematic configuration of the siphon drain member according to the first embodiment in an assembled state, and Fig. 6B is a longitudinal cross-sectional view illustrating the disassembled state. Fig. 6C is a longitudinal cross-sectional view illustrating the schematic configuration of the drop port of the siphon drain member, and Fig. 6D is a longitudinal cross-sectional view illustrating the schematic configuration of the siphon drain member, showing the relationship between the lower drain member and the elbow socket. 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 has, for example, a circular outer shape in plan view, and a receiving hole 111H that is also circular in plan view is formed on the inner periphery thereof. That is, the lower flange portion 111 is formed of a flat plate that is ring-shaped in plan view. The lower flange portion 111 has an upper surface 111A on the outer periphery side formed as a flat surface, and an inner periphery side formed as a recess that is 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 .

[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 attached to the eaves gutter . Further, an outer cylinder inner peripheral hole 112H is formed inside the outer cylinder portion 112, penetrating vertically. An inner peripheral thread portion 115 is formed on the inner peripheral surface of the outer cylindrical portion 112 . Furthermore, four tool mounting recesses (recesses) 118 recessed upward are formed at the lower end 112T of the outer cylindrical portion 112 at 90° intervals 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 they be formed below the lower end of the inner cylindrical 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 of outer cylinder portion 112 by decreasing in diameter as it extends downward. Furthermore, an insertion guide portion (continuously reducing inner diameter surface) 113G is formed on the inner peripheral surface of outer cylinder reduced diameter portion 113. In this embodiment, insertion guide portion (continuously reducing inner diameter surface) 113G is formed, for example, by an inclined surface on the inner peripheral side of a substantially conical cylinder whose diameter continuously reduces from the upper end of outer cylinder reduced diameter portion 113 to the inner peripheral surface of outer cylinder portion 112. In other words, insertion guide portion (continuously reducing inner diameter surface) 113G is configured so as to have no steps protruding toward the inner peripheral side or bulges that could 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, a configuration in which the cross section is tapered in a curved manner, or a tapered surface that combines straight and curved lines.

[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 with 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 arranged on the upper surface 11A of the bottom plate 11 and having a drop portion 121H formed on its inner circumferential 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 circumferential surface of the inner tube portion 122. Then, the inner cylindrical portion 122 of the upper drain member 120 is inserted into the outer cylindrical 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] Upper flange portion 121 has, for example, a circular outer shape in plan view, and has a drop opening portion 121H on the inner periphery that is also circular in plan view. That is, upper flange portion 121 is formed in the shape of a ring-shaped flat plate in 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 .

[0089] In addition, the lower surface 121B of the upper flange portion 121 has, for example, a flat surface formed on the outer periphery, and a positioning step portion 126 consisting of a cylindrical portion that protrudes downward along the tube axis O2 formed on the inner periphery 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, thereby enabling the upper drain member 120 to be positioned relative to the pilot hole 11H. As shown in FIG. 3, the upper surface 121A of the upper flange portion 121 is configured as 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 10. Furthermore, an inner peripheral hole 122H is formed inside the inner cylindrical portion 122, penetrating vertically. Additionally, an outer circumferential thread portion 125 is formed on the outer circumferential surface of the inner cylindrical portion 122 .

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

[0092] In this embodiment, the outer circumferential surface of the inner tube tapered portion 123 is a continuously tapered outer circumferential surface that continuously tapers to the outer circumferential surface of the inner tube portion 122. Specifically, the outer circumferential surface of the inner tube tapered portion 123 is formed into a smooth shape, configured by a gentle curve that concaves inward to the upper end of the inner tube portion 122 in a cross section including the tube axis O1. In other words, no steps are formed on the outer circumferential surface of the inner tube tapered portion. Note that the continuously tapered outer circumferential surface may be configured by a straight line or a line that combines straight lines and curves. It is possible to arbitrarily determine whether or not to form a continuously tapered outer circumferential surface on the outer circumferential surface of the inner tube tapered portion, and a configuration without a continuously tapered outer circumferential surface is also possible.

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

[0094] Next, with reference to Fig. 6C, we will describe the upper surface 123A of the inner cylinder reduced diameter portion 123 that forms the flow path surface of the siphon portion 150. 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 upper surface 123A of inner cylinder reduced diameter portion 123 be formed as large as possible, taking into consideration, for example, the diameter D0 of pilot hole 11H, the diameter D1 of the inner circumferential upper end of outer cylinder reduced diameter portion 113, the diameter D2 of drop opening portion 121H, and the height dimension L11 to the lower end P1 of outer cylinder reduced diameter portion 113. In other words, in order to avoid interference between the outer peripheral surface of inner cylinder reduced diameter portion 123 and the inner circumferential upper end of outer cylinder reduced diameter portion 113, it is preferable to reduce the curvature of outer cylinder reduced diameter portion 113, i.e., upper surface 123A, or to set the diameter D1 of outer cylinder reduced diameter portion 113 to be large.

[0095] Specifically, for example, when the joint (elbow or the like) or downspout 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, in the case of a nominal diameter of 100, it is preferable to set the radius of curvature R to 12 mm or more and 40 mm or less, and in the case of a nominal diameter of 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 peripheral 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 Figure 6D, it is preferable to set the length dimension L12 up to the upper end P1 of the outer tube portion 112 to be 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-described 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 advanced 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, adhesive or packing is attached to the lower surface 121B of the upper flange portion 121. Next, insert the outer tube portion 112 of the lower drain member 110 into the upper drain member 120, and screw the outer thread portion 125 and the inner thread portion 115 together until they are screwed together to the specified position. Then, insert a construction tool (not shown) into the tool attachment recess (recess) 118 and continue to rotate it until it is seated in the 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 cylindrical portion 122 of the upper drain member 120 can be smoothly inserted into the outer cylindrical portion 112 of the lower drain member 110.

[0099] According to the siphon drain member 100 of the first embodiment, a 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 Hereinafter, a second embodiment of the present invention will be described with reference to FIGS. 7A and 7B. Fig. 7A is a longitudinal cross-sectional view illustrating the schematic configuration of a siphon drain member according to a second embodiment, showing the assembled state, and Fig. 7B is a longitudinal cross-sectional view showing the disassembled state. Note that Figs. 7A and 7B are simplified views of the siphon drain member, omitting the siphon portion. 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) arranged 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 of the configuration is the same as in the first embodiment, the same reference numerals are used and the description will be omitted.

[0105] The outer tubular portion 112L is formed, for example, so as to have a longer vertical dimension than the outer tubular 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 tubular 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 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 stepped portion 214 .

[0107] The step portion 214 is connected to the upper end of the outer tubular portion 112L and is configured of a wall portion that is generally ring-shaped in plan view and extends outward in the horizontal direction. The outer periphery of the stepped portion 214 is connected to the lower end of the outer cylinder reduced diameter portion 213 . The lower surface 214A of the step portion 214 constitutes a stopper when the outer cylindrical 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 arranged 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 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 at the bottom of the inner tube portion 122.

[0109] The upper drain member 220 differs from the upper drain member 120 in that it is provided with a guide sleeve (insertion guide portion) 122G formed on the lower part of the inner cylindrical portion 122. As the rest is the same as in the first embodiment, the same reference numerals are used and the description will be omitted.

[0110] As shown in Figures 7A and 7B, the guide sleeve (insertion guide portion) 122G extends downward from the lower end of the outer threaded portion 125 of the inner tube portion 122, and the outer peripheral surface on the lower side is formed into a cylindrical tube shape with the same diameter as the outer peripheral surface on the upper side, so that contact with the inner peripheral surface 113A of the outer tube reduced diameter portion 213 and the upper surface 214B of the step portion 224 is suppressed. 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 tapered and straight. Also, it may have a hill-like bulge formed in the middle to prevent catching.

[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 be set longer than the height dimension L13 from the upper surface 111A of the lower flange portion 111 as the starting point 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] Furthermore, it is preferable that the lower end portion 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 portion 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 tube 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, a construction tool (not shown) can be inserted all the way to the upper bottom surface 118A, enabling efficient and stable construction.

[0114] Also, 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, a 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 is needless to say that the lower end portion 122T of the guide sleeve (insertion guide portion) 122G may be positioned 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 (protrusion) 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, it becomes possible to expand 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, increase the diameter D1 of the dropping port portion 121H, and reduce the curvature of the outer cylinder diameter-reduced portion 113, that is, the upper surface 123A, 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 stepped portion (protrusion) 214.

[0117] Furthermore, according to the siphon drain member 200, the lower end 122T of the guide sleeve 122G is positioned higher than 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 direction of the pipe axis O (O1, O2) is set to be shorter than the length L14 of the outer tube portion 112L of the lower drain member 210 in the direction of the pipe axis O2, 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 outward 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 that is connected downstream of the lower drain member 210, thereby preventing the lower drain member 210 and the first elbow 20 from moving 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 cross-sectional view illustrating the schematic configuration of a siphon drain member according to a third embodiment, showing the assembled state, and Fig. 8B is a longitudinal cross-sectional view showing the disassembled state. Note that Figs. 8A and 8B are simplified views of the siphon drain member, omitting the siphon portion. In FIGS. 8A and 8B, reference numeral 300 denotes a siphon drain member (drain member).

[0121] As shown in Figures 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) arranged above the upper drain member 220. That is, the siphon drain member (drain member) 300 is configured by combining, for example, 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 the same as in 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 tubular portion 112L formed below the lower flange portion 111 and extending downward, an outer tubular reduced diameter portion 113 connecting the lower flange portion 111 and the outer tubular portion 112L, and an inner circumferential thread portion 115 formed on the inner circumferential surface of the outer tubular portion 112L. The lower drain member 310 also includes an insertion guide portion (continuously reduced inner diameter surface) 113G formed on the inner circumferential surface of the outer tubular 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 the same as that of the first embodiment, the same reference numerals are used and the description thereof will be omitted.

[0123] Furthermore, the length L21 of the guide sleeve (insertion guide portion) 122G can be set arbitrarily, but 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, which starts 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 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, by lengthening the vertical dimension of the outer tube reduced diameter portion 113, it is possible to increase the diameter D0 of the opening of the receiving hole 111H shown in Figure 4C, and as a result, it is possible to increase the diameter D2 of the drop opening 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 opening portion 121H, and reduce the curvature of the outer tube reduced diameter portion 113, i.e., the upper surface 123A, to create 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 reduced 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 longitudinal cross-sectional view illustrating the schematic configuration of a siphon drain member according to a fourth embodiment, showing the assembled state, and Fig. 9B is a longitudinal cross-sectional view illustrating the disassembled state. Fig. 9C is a longitudinal cross-sectional view illustrating 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, omitting the siphon portion.

[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) arranged above the upper drain member 320. The lower drain member 110 is the same as that in the first embodiment, so it is given the same reference numeral 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 circumferential side, 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 circumferential surface of the inner tube portion 122.

[0131] The upper drain member 320 also 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 surface 321B of the upper flange portion 321. Specifically, it is formed at a position corresponding to the upper surface corner 11E of the bottom plate 11 on 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 that is approximately the same as or slightly smaller than that of the pilot hole 11H. It is preferable that the positioning edge portion (bending recess) 321E be 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, in a cross section including the tube axis O2, 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, which is positioned outer circumferentially of the pilot hole 11H, and the protruding outer circumferential surface (protruding surface) 323B of the inner-cylinder reduced diameter portion 323, which is positioned inner circumferentially and protrudes downward. 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 circumferential surface (protruding surface) 323B of the inner-cylinder reduced diameter portion 323. The positioning edge portion 321E is formed around the entire periphery of the pilot hole 11H in the circumferential direction.

[0133] Here, the positioning edge portion (bent recess) 321E refers to a recess that opens at an angle greater than 90° between the flat surface and the protruding surface (or the tangent direction at the boundary if the protruding surface is curved). The intersection angle on the lower side is preferably 120° or more, and more preferably 150° or more. In order to stably catch on 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 there is no need for a positioning step portion 126 based on the inner surface (inner wall surface) of the pilot hole 11H, 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 positioned stably with high quality relative to the prepared hole.

[0136] Furthermore, according to the siphon drain member 400, the lower drain member 110 is provided with an insertion guide portion (continuously reducing inner diameter surface) 113G, so that the inner cylindrical portion 122 of the upper drain member 320 can be smoothly inserted into the outer cylindrical portion 112 of the lower drain member 110.

[0137] Fifth Embodiment Hereinafter, the fifth embodiment of the present invention will be described with reference to FIGS. 10A and 10B. Fig. 10A is a longitudinal cross-sectional view illustrating the schematic configuration of a siphon drain member according to a fifth embodiment, showing the assembled state, and Fig. 10B is a longitudinal cross-sectional view showing the disassembled state. Note that Figs. 10A and 10B are simplified views in which the siphon portion is omitted. In FIGS. 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 Figures 10A and 10B, the 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) arranged above the upper drain member 420. The lower drain member 310 is the same as that in the third embodiment, so it is given the same reference numeral and the description thereof will be omitted.

[0139] As shown in Figures 10A and 10B, the upper drain member 420 includes, for example, an upper flange portion 321 arranged 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 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 at the bottom of the inner tube portion 122. The upper drain member 420 also 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 is provided with a guide sleeve (insertion guide portion) 122G formed on the lower part of the inner cylindrical portion 122. As the rest is the same as in the fourth embodiment, 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 has an insertion guide portion (continuously reducing inner diameter surface) 113G, and the upper drain member 420 has a guide sleeve (insertion guide portion) 122G, so that the upper drain member 420 can be inserted into the lower drain member 310 efficiently and stably.

[0142] Furthermore, according to the siphon drain member 500, the upper drain member 420 is provided with the positioning edge portion (bent recess) 321E, so that 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 an 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 a 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 continuously 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 described as being formed in a generally conical shape with a cross section including the pipe axis O1 that is reduced in diameter in a linear manner, but the configuration of the lower drain member reduced diameter portion 113, 213 can be set arbitrarily. For example, the cross section including the pipe axis O1 may be reduced in diameter in a curved manner, or may be formed by a slope that combines straight and curved lines. Furthermore, a bulge may be formed within a range that does not cause the inner cylindrical portion 122 or the guide sleeve 122G to get caught.

[0147] In the above embodiment, the guide sleeve 122G formed below the inner cylindrical portion 122 has a straight shape with the same diameter up to the tip, but the shape of the guide sleeve can be set arbitrarily. For example, the guide sleeve may be tapered with a reduced diameter at the tip (lower) side, or may be configured with a shape that combines a straight cylindrical portion with a tapered portion. Furthermore, a bulge may be formed within a range that does not cause snagging between the guide sleeve 122G and the reduced diameter portion 113 of the outer cylindrical portion.

[0148] Furthermore, in the above embodiment, 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 as shown in FIG. 7A to the upper surface 214B of the positioning step portion 214, or the height dimension L16 to the lower end of the outer tube tapered portion 113 as 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 tapered portion 113 may be set arbitrarily.

[0149] Furthermore, in the above embodiment, the case has been described where the length L21 of the guide sleeve 122G to the lower end 122T is shorter than the length L14 of the outer tube portion 112L to the lower end 112T, but the relationship between the length L21 of the guide sleeve 122G and the length L14 of the outer tube portion 112L to the lower end 112T can be set arbitrarily, 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 of the inner tube portion 122 to the lower end 122T can also 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. However, 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] Furthermore, in the above embodiment, the case has been described in which upper drain members 120, 220 include positioning step portion 126 and upper drain members 320, 420 include positioning edge portion (bending recess) 321E, but whether or not the upper drain members include positioning step portion 126 and positioning edge portion (bending recess) 321E may be set arbitrarily. For example, as shown in Fig. 9D, in the case where connection portion 324 between upper flange portion 321 and upper surface 323A of upper drain member 320C is bent, if upper drain member 320C includes positioning edge portion (bending recess) 321E, stress is likely to concentrate between the upper and lower bent portions because there are bent portions above and below flange portion 321. Therefore, when the connection portion 324 between the upper flange portion 321 of the upper drain member 320C and the upper surface 323A 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] Furthermore, in the above embodiment, a positioning step portion 214 that corresponds to the receiving portion of a coupling member such as an elbow and sets the relative position of each other is formed on the lower side of the outer tube reduced diameter portion 213 of the lower drain member 210, and the upper surface 214B of the positioning step portion 214 forms 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 a plan view. However, as shown in FIGS. 14A to 14E, the upper flange portion 121, 321 may be ring-shaped with a portion cut out, as in the upper drain member 120A, 320A. The upper flange portion 121, 321 may have at least one cutout 127, or may have multiple cutouts. If multiple cutouts 127 are provided, they are preferably arranged at equal intervals around the circumference 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 notches 127, the notches 127 may be provided in the upper flange portions 121, 321 at positions where the vertical ribs 155 are formed. However, in order to maintain the strength of the vertical ribs 155, it is preferable to form the notches 127 in positions of the upper flange portions 121, 321 where the vertical ribs 155 are not formed. In order to allow rainwater to smoothly flow into the outlet 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 portions 121, 321 of the upper drain members 120, 320 may be polygonal, such as a square, pentagon, or hexagon, in plan view. In this case, it is preferable that the outer edge of the vertical rib 155 coincides with the vertices of the polygon. For example, when there are five vertical ribs 155, the upper flange portions 121, 321 are pentagonal in plan view, and when there are six vertical ribs 155, the upper flange portions 121, 321 are hexagonal in plan view. The flange portions 121, 321 and the vertical ribs 155 are arranged so that the outer edge of the vertical rib 155 is positioned at each vertex of the polygonal upper flange portions 121, 321. In the case of a polygonal shape, each vertex may be sharp or chamfered into an arc shape.

[0154] 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 relative 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. 15A to 15E, the notch 127 may be cut out further toward the center of the pilot hole 11H than the positioning step 126 or the positioning bent portion 321E. In this case, the presence of the notch 127 makes it possible to eliminate the step caused by the upper flange portions 121, 321 in the bottom plate 11 of the eaves gutter 10. As a result, rainwater accumulating on the bottom plate 11 can easily flow into the outlet portion 121H.

[0155] Furthermore, the diameter D1 of the upper end of the inner periphery of the outer tube tapered portion 113 may be smaller than the diameter D0 of the pilot hole 11H as shown in Figure 6A, or may be larger than the diameter D0 of the pilot hole 11H as shown in Figure 7A, but is not limited to this, and the diameter D1 of the upper end of the inner periphery of the outer tube tapered portion 113 may be the same as the diameter D0 of the pilot hole 11H. For example, the diameter D1 of the inner upper end of the outer tube narrowing diameter portion 113 may be larger than the inner diameter of the step portion 126 and the diameter of the positioning edge portion (bending recess) 321E so that the positioning step portion 126 of the upper drain member and the outer surface of the inner tube narrowing diameter portion 123 do not interfere with the inner upper end of the outer tube narrowing diameter portion 113. However, when the siphon drain member is installed in the eaves gutter, as long as the positioning step portion 126 of the upper drain member and the outer surface of the inner tube reduced diameter portion 123 do not interfere with the inner upper end portion of the outer tube reduced diameter portion 113, the diameter D1 of the inner upper end portion of the outer tube reduced diameter portion 113 may be smaller than the diameter D0 of the pilot hole 11H, the inner diameter of the 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 end of the inner circumference when the flat surface opposite the bottom surface of the eaves gutter of the lower flange portion is viewed in a plane is considered to be the upper end of the inner circumference of the outer tube reduced diameter portion 113.

[0156] In addition, in the drawings of the above embodiment, the lower drain member 110 is shown as being integrally formed with the lower flange portion 111, the outer tubular portion 112 formed below the lower flange portion 111 and extending downward, and the outer tubular reduced diameter portion 113 connecting the lower flange portion 111 and the outer tubular portion 112. However, the lower drain member may be formed with the lower flange portion and the outer tubular portion molded as separate members, and the lower flange member adhesively joined to the bottom surface of the eaves gutter and the cylindrical outer tubular member having an internally threaded 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 tubular member are connected by fitting a fitting portion, such as a recessed or concave portion, provided on the outer surface of the outer tubular member and a fitting portion, which extends from the lower flange member and has a recessed or concave portion and engages with the fitting portion. In this case, the connection between the lower flange member and the outer tubular member does not have to be at the upper end of the outer tubular member; any outer peripheral surface of the outer tubular member may be connected to any location on the lower flange member. Furthermore, in this case, the upper end of the outer tubular member may be provided with a guide tube portion as an insertion guide that extends to the bottom surface of the eaves gutter to an extent that it does not come into contact with the outer surface of the reduced-diameter portion of the inner tubular member of the upper drain member. By inserting the lower end of the inner tubular portion of the upper drain member into this guide tube portion, tilting of the upper drain member can be suppressed. The guide tube portion may have a diameter that tapers downward from the upper end, and the outer diameter of the lower portion of the guide tube portion is smaller than the diameter of the pilot hole 11H in the bottom of the eaves gutter. In this case, either the outer tube member or the lower drain member can be connected to the elbow or downspout, and a socket or spigot to which the elbow or downspout can be connected can be provided at the lower end of the outer tube member or the lower drain member. In this case, there may be no outer tube tapering portion connecting the lower flange member and the outer tube member, and rather than a shape that reduces in diameter as it goes downward, either the lower flange member or the outer tube member may have a member that connects the lower flange member and the outer tube member.

[0157] In addition, it is possible to replace the components in the above-described embodiments with well-known components as appropriate, without departing from the spirit of the present invention, and the above-described embodiments may be combined and applied 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 component (drain component) 110, 210, 310 Lower drain member 111 Lower flange 111H Receiving hole 112, 112L outer cylinder 112H Outer cylinder inner hole 113 Outer cylinder reduced diameter part 113G Insertion guide part (continuously reduced inner diameter surface) 115 Inner circumference thread 213 Outer cylinder narrowed diameter part 214 Step (protrusion) 120, 120A, 120B, 220, 320, 320A, 320B, 320C, 420 Upper drain member 121, 321 Upper flange 121B, 321B Upper flange bottom surface 121H Drop-out section 122 Inner cylinder 122H Inner cylinder inner circumferential hole 122G Guide sleeve (guide tube, insertion guide) 123 Inner cylinder narrowed diameter section 123D Step 125 Outer thread 126 Positioning step 321E Positioning edge part (positioning bend part) 150 Siphon Section

Claims

1. A siphon drain member having a bottom plate and side plates extending upward from both ends of the bottom plate in the width direction, the siphon drain member being attached to an eaves gutter having a pilot hole formed in the bottom plate, a lower drain member having a lower flange portion disposed on the lower surface of the bottom plate and having a receiving port 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 the lower flange portion and an upper end of 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 drain member having an upper flange portion disposed on the upper surface of the bottom plate and having a drop opening 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 tapered portion connecting the upper flange portion and an upper end of the inner tubular portion and tapering downward; and an outer periphery thread portion formed on the outer periphery of the inner tubular portion and threadedly engaging with the inner periphery thread portion; Equipped with The upper drain member is a guide sleeve extending downward from a lower end of the outer peripheral threaded portion and having a length shorter than that of the lower end of the outer cylindrical portion; a linear bent recessed portion disposed around the entire circumference of the lower surface of the upper flange portion at a position corresponding to the peripheral edge of the pilot hole, the linear bent recessed portion being 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; a cover member disposed above the pilot hole; a rib disposed on the lid member; The ribs are provided in a plurality at intervals in the circumferential direction, The inner diameter of the inner cylindrical portion is 70 mm or more and 170 mm or less, The lower drain member is a protrusion extending toward an outer periphery of 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 circumferential upper end of the reduced diameter portion of the outer cylinder is larger than the diameter of the pilot hole. A siphon drain member characterized by:

2. A siphon drain member having a bottom plate and side plates extending upward from both ends of the bottom plate in the width direction, the siphon drain member being attached to an eaves gutter having a pilot hole formed in the bottom plate, a lower drain member having a lower flange portion disposed on the lower surface of the bottom plate and having a receiving port 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 the lower flange portion and an upper end of 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 drain member having an upper flange portion disposed on the upper surface of the bottom plate and having a drop opening 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 tapered portion connecting the upper flange portion and an upper end of the inner tubular portion and tapering downward; and an outer periphery thread portion formed on the outer periphery of the inner tubular portion and threadedly engaging with the inner periphery thread portion; Equipped with The upper drain member is a guide sleeve extending downward from a lower end of the outer peripheral threaded portion and having a length shorter than that of the lower end of the outer cylindrical portion; a linear bent recessed portion disposed around the entire circumference of the lower surface of the upper flange portion at a position corresponding to the peripheral edge of the pilot hole, the linear bent recessed portion being 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; a cover member disposed above the pilot hole; a rib disposed on the cover member for rotating the cover member; The inner diameter of the inner cylindrical portion is 70 mm or more and 170 mm or less, The lower drain member is a protrusion extending toward an outer periphery of 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 circumferential upper end of the reduced diameter portion of the outer cylinder is larger than the diameter of the pilot hole. A siphon drain member characterized by:

3. A siphon drain member having a bottom plate and side plates extending upward from both ends of the bottom plate in the width direction, the siphon drain member being attached to an eaves gutter having a pilot hole formed in the bottom plate, a lower drain member having a lower flange portion disposed on the lower surface of the bottom plate and having a receiving port 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 the lower flange portion and an upper end of 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 drain member having an upper flange portion disposed on the upper surface of the bottom plate and having a drop opening 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 tapered portion connecting the upper flange portion and an upper end of the inner tubular portion and tapering downward; and an outer periphery thread portion formed on the outer periphery of the inner tubular portion and threadedly engaging with the inner periphery thread portion; Equipped with The upper drain member is a guide sleeve extending downward from a lower end of the outer peripheral threaded portion and having a length shorter than that of the lower end of the outer cylindrical portion; a linear bent recessed portion disposed around the entire circumference of the lower surface of the upper flange portion at a position corresponding to the peripheral edge of the pilot hole, the linear bent recessed portion being 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; a cover member disposed above the pilot hole; a guide extending downward in the axial direction at a central portion of the cover member; a plurality of vertical ribs arranged on the 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 inner diameter of the inner cylindrical portion is 70 mm or more and 170 mm or less, The lower drain member is a protrusion extending toward an outer periphery of 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 circumferential upper end of the reduced diameter portion of the outer cylinder is larger than the diameter of the pilot hole. A siphon drain member characterized by:

4. 4. The siphon drain member according to claim 3, wherein the induction guide is formed by a funnel-shaped or cylindrical wall portion having holes formed at the upper and lower ends.

5. 5. The siphon drain member according to claim 1, A siphon 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.

6. 6. The siphon drain member according to claim 1, The upper drain member is A siphon drain member characterized in that it has a continuously tapered outer peripheral surface formed on the outer peripheral surface of the tapered inner cylindrical portion, the continuously tapered outer peripheral surface being continuously tapered from the bent recess to the outer peripheral surface of the inner cylindrical portion.

7. 7. The siphon drain member according to claim 1, The outer cylindrical portion of the lower drain member has a recess formed therein that is recessed upward from a lower end thereof, The lower end of the guide sleeve is A siphon drain member characterized in that it is positioned above an upper bottom surface of the recess.

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

9. Eaves gutters and The siphon drain member according to any one of claims 1 to 7, which is installed on a bottom plate of the eaves gutter; A downspout connected to the outer tubular portion.

10. A siphon drain member according to any one of claims 1 to 7; a first elbow connected to the lower drain member of the siphon drain member; a call gutter connected to the lower drain member via the first elbow; A second elbow connected to the outlet pipe; A downspout comprising: a downspout connected to the outlet spout via the second elbow.

11. A rain gutter comprising an eaves gutter on which the siphon drain member according to any one of claims 1 to 7 is installed.

12. A rain gutter comprising a downspout to which the siphon drain member according to any one of claims 1 to 7 is connected.

13. A roof with eaves, an eaves gutter arranged at the eaves; The siphon drain member according to any one of claims 1 to 7, which is installed on the bottom surface of the eaves gutter; A building comprising: a downspout connected to the outer tubular portion protruding downward from the bottom of the eaves gutter.

14. The building according to claim 13, further comprising a catch basin to which the lower end of the downspout is connected.

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