JP7060393B2 - Funnel and siphon gutter system - Google Patents

Description

The present invention relates to a funnel and siphon gutter system.

Generally, a building is provided with a gutter for catching rainwater flowing down from the roof and pouring it onto the ground. A rain gutter is composed of a plurality of members such as an eaves gutter, a funnel (a funnel, a water collector), a gutter, a gutter, a connecting pipe, an elbow joint, and a cheese joint. In recent years, in order to increase the drainage capacity of rain gutters, the siphon rain gutter system that causes the suction action of water (so-called siphon phenomenon) by filling the inside of the gutter with water and dramatically increases the amount of drainage has been introduced. Proposed.

For example, in the siphon type rainwater drainage device disclosed in Patent Document 1, the upper end of the siphon pipe is connected to the bottom of the eaves gutter attached to the eaves. This siphon pipe is provided in the vertical direction along the outer wall material of the house.

Japanese Unexamined Patent Publication No. 2004-308399

However, in the siphon type rainwater drainage device of Patent Document 1, when the speed at which rainwater flowing inside the drainage device decreases, it becomes difficult to exhibit sufficient drainage capacity due to the siphon phenomenon.

The present invention has been made in view of such problems, and an object of the present invention is to provide a funnel that facilitates exhibiting sufficient drainage capacity due to the siphon phenomenon, and a siphon type rainwater drainage device provided with the funnel. do.

In order to solve the above problems, the present invention proposes the following means.
The funnel of the present invention is a funnel that connects an eaves gutter and a vertical gutter, and has a main body portion in which a recess opened above extends along a horizontal plane and both ends in a direction along the horizontal plane are connected to the eaves gutter. The first diameter-reduced portion, which is connected to the drop opening formed in the bottom wall portion of the main body portion and whose inner diameter gradually decreases toward the lower side, and the lower end portion of the first diameter-reduced portion, which is connected downward. A second diameter-reduced portion that extends to the lower end of the large-diameter cylinder and gradually decreases in inner diameter toward the bottom, and a second reduced-diameter portion that is connected to the lower end of the second diameter-reduced portion and downwards. A small-diameter cylinder portion that extends and is formed to have an outer diameter smaller than that of the large-diameter cylinder portion, and a connection between the first diameter-reduced portion and the large-diameter cylinder portion in a cross section including an axis of the large-diameter cylinder portion. The inner peripheral surface of the portion is curved with a radius of curvature of 10 mm or more and 60 mm or less so as to be convex inward, and in the cross section, the inside of the connecting portion between the large diameter cylinder portion and the second reduced diameter portion. The peripheral surface is curved with a radius of curvature of 5 mm or more and 40 mm or less so as to be recessed toward the outside, and in the cross section, the inner peripheral surface of the connecting portion between the second reduced diameter portion and the small diameter cylinder portion is inward. It is characterized in that it is curved with a radius of curvature of 5 mm or more and 40 mm or less so as to be convex toward it .

According to the present invention, the rainwater that has flowed into the first diameter-reduced portion through the eaves gutter and the main body of the funnel passes through the connection portion between the first diameter-reduced portion and the large-diameter cylinder portion and enters the large-diameter cylinder portion. It flows in. At this time, since the inner peripheral surface of the connecting portion is curved so as to be convex inward, when a corner portion that is convex inward is formed on the inner peripheral surface of the connecting portion, etc. In comparison, the change in the flow of rainwater flowing through the connection is slower. Therefore, it is possible to suppress the occurrence of pressure loss in the rainwater flowing in the connection portion, and the speed of the rainwater flowing in the connection portion is less likely to decrease. Therefore, the funnel can easily exert sufficient drainage capacity due to the siphon phenomenon.

Further , the elbow joint, the downspout, etc. to be connected to the funnel can be selected and used depending on whether the inner diameter corresponding to the large diameter cylinder portion is large or the inner diameter corresponding to the small diameter cylinder portion is small. When connecting an elbow joint or the like to the funnel, when connecting an elbow joint or the like having a small inner diameter, the funnel may be used as it is. When connecting an elbow joint or the like having a large inner diameter, the second reduced diameter portion and the small diameter cylinder portion may be separated from the funnel.
Further, the change in the flow of rainwater flowing in the connection portion between the second reduced diameter portion and the small diameter cylinder portion is compared with the case where a corner portion that is convex inward is formed on the inner peripheral surface of the connecting portion. Is slowed down and pressure loss is suppressed. Therefore, the funnel can further facilitate the sufficient drainage capacity due to the siphon phenomenon.
In addition, the change in the flow of rainwater flowing in the connection portion between the large diameter cylinder portion and the second reduced diameter portion is gradual as compared with the case where the inner peripheral surface of the connection portion is recessed so as to form a corner portion. Therefore, vortices and the like are less likely to occur in the connecting portion. As a result, it is possible to suppress the occurrence of pressure loss in the rainwater flowing in the connection portion, and it is possible to make it easier for the funnel to further exert sufficient drainage capacity due to the siphon phenomenon. In addition, compared to the case where the inner peripheral surface of this connection portion is recessed so as to form a corner portion, stress is less likely to concentrate on the connection portion even when an external force acting on the funnel is applied, and this connection portion becomes difficult to concentrate. It becomes difficult to break.

Further, the siphon rain gutter system of the present invention includes the eaves gutter, the funnel according to claim 1 in which the main body portion is connected to the eaves gutter, and the first elbow joint connected to the small diameter cylinder portion . A gutter connected to the first elbow joint and having a horizontal length of 1.5 mm or less, a second elbow joint connected to the gutter, and a second elbow joint connected to the second elbow joint and having a length of 3 m. It is characterized by having the above-mentioned vertical gutter .
According to the present invention, a siphon rain gutter system can be configured by using a funnel that facilitates exhibiting sufficient drainage capacity due to the siphon phenomenon.

According to the funnel and the siphon type rainwater drainage device of the present invention, it is possible to easily exert a sufficient drainage capacity due to the siphon phenomenon.

It is the figure which saw the siphon type rainwater drainage device of one Embodiment of this invention from the side view by breaking a part. It is sectional drawing of the cutting line A1-A1 in FIG. It is sectional drawing from the side view explaining the case where the 1st elbow having a larger inner diameter is fixed to the funnel of one Embodiment. It is a vertical sectional view of the funnel. It is a vertical sectional view of the siphon type rainwater drainage device in the modification of embodiment of this invention. It is sectional drawing of the side view explaining the case where the 1st elbow having a larger inner diameter is fixed to the funnel of a modification. It is a vertical sectional view of the funnel.

Hereinafter, an embodiment of the siphon rain gutter system according to the present invention will be described with reference to FIGS. 1 to 7.
As shown in FIGS. 1 and 2, the siphon rain gutter system 1 of the present embodiment includes an eaves gutter 11, a funnel 16 of the present embodiment, a first elbow joint 36, a gutter 41, and a second elbow joint. It is equipped with a 46 and a downspout 51. In FIG. 2, for convenience of explanation, the direction in which the first elbow joint 36 and the gutter 41 are attached to the funnel 16 is rotated by 90 ° around the axis along the vertical direction D1.

The eaves gutter 11 is fixed under the eaves of the roof of a building (not shown). The eaves gutter 11 is open upward. The eaves gutter 11 is arranged substantially along a horizontal plane. The eaves gutter 11 is arranged so that the end connected to the funnel 16 is located below the end not connected to the funnel 16 and the eaves gutter 11 is tilted by a water gradient (for example, 1/300).
When a plurality of funnels 16 are provided in the siphon rain gutter system 1, the length of the eaves gutter 11 between the funnels 16 is 30 m or less. When one funnel 16 is provided in the siphon rain gutter system 1, the distance from the end (stop) of the eaves gutter 11 to the funnel 16 is 15 m or less.

The funnel 16 connects the eaves gutter 11 and the downspout 51 via a first elbow joint 36, a nominal gutter 41, and a second elbow joint 46. The funnel 16 includes a main body portion 17, a first diameter reduction portion 18, a large diameter cylinder portion 19, a second diameter reduction portion 20, and a small diameter cylinder portion 21.
The main body portion 17 includes a bottom wall portion 24 and side wall portions 25 and 26. The bottom wall portion 24 is arranged so that the thickness direction is along the vertical direction D1. The bottom wall portion 24 extends along the extending direction D2 along the outer edge portion of the roof. The extending direction D2 is a direction along the horizontal plane.
A drop opening 24a, which is a through hole that penetrates the bottom wall portion 24 in the vertical direction D1, is formed in the central portion of the bottom wall portion 24 in a plan view along the vertical direction D1. The drop opening 24a has a circular shape, an elliptical shape, or the like in a plan view. However, the shape of the drop opening 24a in a plan view is not limited to these shapes, and may be a quadrangle, a rectangle, or the like.

The side wall portions 25 and 26 are erected at the ends of the bottom wall portion 24 in the width direction D3 orthogonal to the vertical direction D1 and the extending direction D2, respectively. The side wall portions 25 and 26 are formed over the entire length of the bottom wall portion 24 in the extending direction D2. The distance between the side wall portions 25 and 26 gradually increases toward the upper side.
The bottom wall portion 24 and the side wall portions 25 and 26 form a recess 17a having an upper opening in the main body portion 17. The recess 17a is formed so as to extend in the extending direction D2.
As shown in FIG. 2, eaves gutters 11 are arranged in both ends of the main body 17 in the extending direction D2. Since the eaves gutter 11 is arranged in the end portion of the main body portion 17, the main body portion 17 and the eaves gutter 11 are connected to each other. In this example, the eaves gutter 11 is not fixed to the main body portion 17. Therefore, the eaves gutter 11 can be moved in the extending direction D2 with respect to the main body portion 17 due to expansion and contraction of the eaves gutter 11.

As shown in FIGS. 1 and 2, in the present embodiment, the first diameter-reduced portion 18 and the second diameter-reduced portion 20 are each formed in an annular shape, and the large-diameter cylinder portion 19 and the small-diameter cylinder portion 21 are cylindrical, respectively. Is formed in. The axes of the reduced diameter portions 18 and 20 and the tubular portions 19 and 21 are arranged coaxially with the common axis. Hereinafter, this common axis is referred to as an axis O. The axis O is arranged along the vertical direction D1.
The first diameter-reduced portion 18 is formed so that the inner diameter and the outer diameter gradually decrease toward the bottom. In the cross section S1 including the axis O, the inner peripheral surface and the outer peripheral surface of the first reduced diameter portion 18 are each formed linearly. The upper end portion of the first reduced diameter portion 18 is connected to the opening peripheral edge portion of the drop opening 24a in the bottom wall portion 24.

The upper end portion of the large diameter cylinder portion 19 is connected to the lower end portion of the first diameter reduction portion 18, and the large diameter cylinder portion 19 extends downward from the first diameter reduction portion 18. The length of the large-diameter cylinder portion 19 in the direction parallel to the axis O is preferably 30 mm or more and 120 mm or less, more preferably 35 mm or more and 100 mm or less, and further preferably 40 mm or more and 80 mm or less.
By setting the length of the large-diameter tubular portion 19 to the above lower limit value or more, the radius of curvature on the inner peripheral surface of the first connecting portion 28, which will be described later, is increased, and the receiving port 38 of the first elbow joint 36 and the funnel 16 are connected to each other. It is possible to secure a margin for adhesion. By setting the length of the large-diameter cylinder portion 19 to the above upper limit value or less, the manufacturing cost of the funnel 16 can be reduced.

As shown in FIG. 2, in the cross section S1, the inner peripheral surface of the first connection portion 28, which is the connection portion between the first diameter reduction portion 18 and the large diameter cylinder portion 19, is convex toward the inside (axis O side). It is curved so that it becomes. In the cross section S1, the outer peripheral surface of the first connecting portion 28 is curved so as to be recessed inward. The inner peripheral surface and the outer peripheral surface of the first connecting portion 28 are formed in this way over the entire circumference around the axis O. The same applies to the second connection portion 29 and the third connection portion 30, which will be described later.
It is preferable that the inner peripheral surface of the first connecting portion 28 is smoothly connected to the inner peripheral surface of the first reduced diameter portion 18 and the inner peripheral surface of the large diameter tubular portion 19, respectively. In the cross section S1, the radius of curvature on the inner peripheral surface of the first connecting portion 28 is preferably 10 mm or more and 60 mm or less, more preferably 15 mm or more and 50 mm or less, and further preferably 20 mm or more and 40 mm or less.

The second diameter-reduced portion 20 is formed so that the inner diameter and the outer diameter gradually decrease toward the bottom. The upper end portion of the second diameter reduction portion 20 is connected to the lower end portion of the large diameter cylinder portion 19.
In the cross section S1, the inner peripheral surface of the second connecting portion 29, which is the connecting portion between the large diameter cylinder portion 19 and the second reduced diameter portion 20, is curved so as to be recessed toward the outside (the side opposite to the axis O). ing. In the cross section S1, the outer peripheral surface of the second connecting portion 29 is curved so as to be convex toward the outside. It is preferable that the inner peripheral surface of the second connecting portion 29 is smoothly connected to the inner peripheral surface of the large diameter tubular portion 19 and the inner peripheral surface of the second reduced diameter portion 20. In the cross section S1, the radius of curvature on the inner peripheral surface of the second connecting portion 29 is preferably 5 mm or more and 40 mm or less, and more preferably 10 mm or more and 30 mm or less.
The second connecting portion 29 may be formed thick as shown by the alternate long and short dash line L in FIG.

The outer diameter and inner diameter of the small diameter cylinder portion 21 are formed to be smaller than the outer diameter and inner diameter of the large diameter cylinder portion 19, respectively. The upper end portion of the small diameter cylinder portion 21 is connected to the lower end portion of the second diameter reduction portion 20, and the small diameter cylinder portion 21 extends downward from the second diameter reduction portion 20. The cross-sectional area orthogonal to the axis O in the small-diameter tubular portion 21 is 5 cm ² to 300 cm ² , preferably 13 cm ² to 190 cm ² , and more preferably 20 cm ² to 140 cm ² .
The length of the small diameter cylinder portion 21 in the direction parallel to the axis O is preferably 15 mm or more and 100 mm or less, more preferably 25 mm or more and 80 mm or less, and further preferably 30 mm or more and 60 mm or less. By setting the length of the small-diameter tubular portion 21 to the above lower limit value or more, the radius of curvature on the inner peripheral surfaces of the second connecting portion 29 and the third connecting portion 30, which will be described later, is increased, and the receiving port 38 of the first elbow joint 36 is increased. It is possible to secure an adhesion margin between the funnel 16 and the funnel 16. By setting the length of the small diameter cylinder portion 21 to the above upper limit value or less, the manufacturing cost of the funnel 16 can be reduced.

In the cross section S1, the inner peripheral surface of the third connecting portion 30, which is the connecting portion between the second reduced diameter portion 20 and the small diameter tubular portion 21, is curved so as to be convex inward. In the cross section S1, the outer peripheral surface of the third connecting portion 30 is curved so as to be recessed inward. It is preferable that the inner peripheral surface of the third connecting portion 30 is smoothly connected to the inner peripheral surface of the second reduced diameter portion 20 and the inner peripheral surface of the small diameter tubular portion 21, respectively. In the cross section S1, the radius of curvature on the inner peripheral surface of the third connecting portion 30 is preferably 5 mm or more and 40 mm or less, and more preferably 10 mm or more and 30 mm or less.

The first elbow joint 36 includes a curved pipe portion 37 and receiving ports 38 and 39 provided at both ends of the curved pipe portion 37. The curved tube portion 37 is curved so that the central angle is approximately 90 ° when viewed from the side. The receiving port 38 is connected to the first end portion of the curved tube portion 37, and the receiving port 39 is connected to the second end portion of the curved tube portion 37.
The inner diameter of the receiving port 38 is larger than the inner diameter of the curved tube portion 37 and the outer diameter of the small diameter tubular portion 21, and smaller than the outer diameter of the large diameter tubular portion 19. The receiving port 39 is configured in the same manner as the receiving port 38.
The small-diameter tubular portion 21 of the funnel 16 is inserted into the receiving port 38, and the receiving port 38 and the small-diameter tubular portion 21 are fixed by an adhesive or the like (not shown).

As shown in FIG. 1, the gutter 41 is formed in a straight tubular shape. The gutter 41 extends along the width direction D3 or gradually tilts downward to the extent of a water gradient as it separates from the first elbow joint 36. The first end portion of the gutter 41 is inserted into the receiving port 39 of the first elbow joint 36, and the receiving port 39 and the calling gutter 41 are fixed by an adhesive or the like (not shown).
The second elbow joint 46 includes a curved pipe portion 47 and receiving ports 48 and 49, which are configured in the same manner as the curved pipe portion 37 and the receiving ports 38 and 39 of the first elbow joint 36. The second end portion of the gutter 41 is inserted into the receiving port 48, and the receiving port 48 and the calling gutter 41 are fixed by an adhesive or the like (not shown).

The downspout 51 is formed in a straight tubular shape and extends along the vertical direction D1. The first end portion of the downspout 51 is inserted into the receiving port 49 of the second elbow joint 46, and the receiving port 49 and the downspout 51 are fixed by an adhesive or the like (not shown).
The length of the downspout 51 in the vertical direction D1 is preferably 2 m or more, and preferably 3 m or more. Here, the length of the gutter 51 refers to the vertical distance of the gutter 51 located on the downstream side of the second elbow joint 46 when the siphon rain gutter system 1 includes the gutter 41. Further, when the siphon rain gutter system 1 does not include the calling gutter 41, it refers to the vertical distance to the connection portion with the funnel 16 in the gutter 51.

The calling gutter 41 horizontally guides the rainwater flowing down from the funnel 16 provided in the eaves gutter 11. One end side of the gutter 41 is connected to the lower end of the funnel 16 by the first elbow joint 36. The other end of the gutter 41 is connected to the upper end of the gutter 51 by a second elbow joint 46. The horizontal distance of the gutter 41 is 1.5 m or less, preferably 1 m or less. Here, the horizontal distance of the gutter 41 refers to the horizontal distance including the gutter 41 from the center (axis line O) of the small diameter tube portion 21 of the funnel 16 to the central axis of the gutter 51.
The eaves gutter 11, funnel 16, first elbow joint 36, nominal gutter 41, second elbow joint 46, and gutter 51 are preferably made of a resin such as vinyl chloride, and are particularly made of hard vinyl chloride. Is preferable.

The second end of the gutter 51 is connected to the ground G and is connected to a known water collecting mass 101 buried in the ground. The length of the catchment mass 101 in the width direction D3 is longer than the outer diameter of the downspout 51.
The water collecting mass 101 is connected to a drainage structure 103 such as a sewer pipe via a connecting pipe 102.

Next, the operation of the siphon rain gutter system 1 configured as described above will be described.
When rainwater falls on the roof of a building, the rainwater flows down along the roof and flows into the funnel 16 through the eaves gutter 11 of the siphon gutter system 1. A part of the rainwater that has flowed into the first reduced diameter portion 18 through the main body portion 17 of the funnel 16 passes through the first connecting portion 28 and flows into the large diameter tubular portion 19. At this time, since the inner peripheral surface of the first connecting portion 28 is curved so as to be convex inward, a corner portion that is convex inward is formed on the inner peripheral surface of the first connecting portion 28. The change in the flow of rainwater flowing in the first connecting portion 28 becomes gradual as compared with the case where the stormwater is used. The corner portion here means, for example, a shape formed by connecting the ends of two straight lines.

The rainwater that has passed through the first connection portion 28 flows into the second connection portion 29 through the inside of the large diameter cylinder portion 19. Since the inner peripheral surface of the second connecting portion 29 is curved so as to be recessed toward the outside, the inner peripheral surface of the second connecting portion 29 is recessed so as to form a corner portion, etc. The change in the flow of rainwater flowing in the second connection portion 29 becomes gradual, and vortices and the like are less likely to occur in the second connection portion 29. Further, as compared with the case where the inner peripheral surface of the second connecting portion 29 is recessed so as to form a corner portion, the stress due to the external force acting on the funnel 16 is less likely to be concentrated on the second connecting portion 29.
The rainwater that has passed through the second connecting portion 29 flows into the third connecting portion 30 through the second reduced diameter portion 20. Since the inner peripheral surface of the third connecting portion 30 is curved so as to be convex inward, when a corner portion that is convex inward is formed on the inner peripheral surface of the third connecting portion 30. Etc., the change in the flow of rainwater flowing in the third connection portion 30 becomes gradual.

Rainwater flowing from the inside of the small diameter tubular portion 21 of the funnel 16 into the first elbow joint 36, the nominal gutter 41, the second elbow joint 46, and the vertical gutter 51 flows into the catchment mass 101. Further, this rainwater flows into the drainage structure 103 via the connecting pipe 102 and is appropriately treated.
At this time, it is assumed that the siphon rain gutter system 1 is filled with rainwater and the siphon phenomenon occurs, for example, when the flow rate of rainwater becomes a certain value or more. In this case, since the inner peripheral surface of the first connecting portion 28 of the funnel 16, the inner peripheral surface of the second connecting portion 29, and the inner peripheral surface of the third connecting portion 30 are formed as described above, the funnel 16 is formed. The speed of rainwater flowing in the connection portions 28, 29, and 30 of the above is less likely to decrease.

As described above, according to the funnel 16 of the present embodiment, the rainwater that has flowed into the first reduced diameter portion 18 through the eaves gutter 11 and the main body portion 17 of the funnel 16 passes through the inside of the first connecting portion 28. , Flows into the large diameter cylinder portion 19. At this time, since the inner peripheral surface of the first connecting portion 28 is curved so as to be convex inward, a corner portion that is convex inward is formed on the inner peripheral surface of the first connecting portion 28. The change in the flow of rainwater flowing in the first connecting portion 28 becomes gradual as compared with the case where the stormwater is used. Therefore, it is possible to suppress the occurrence of pressure loss in the rainwater flowing in the first connection portion 28, and the speed of the rainwater flowing in the first connection portion 28 is less likely to decrease. Therefore, the funnel 16 can easily exert a sufficient drainage capacity due to the siphon phenomenon.
In addition, rainwater is less likely to collect in the first connection portion 28, and the drainage property of the first connection portion 28 can be improved.

The inner peripheral surface of the third connecting portion 30 is curved so as to be convex inward. For this reason, the change in the flow of rainwater flowing in the third connection portion 30 becomes gradual as compared with the case where a corner portion that is convex inward is formed on the inner peripheral surface of the third connection portion 30. Therefore, pressure loss is suppressed. Therefore, the funnel 16 can further facilitate the sufficient drainage capacity due to the siphon phenomenon.
The inner peripheral surface of the second connecting portion 29 is curved so as to be recessed toward the outside. Compared to the case where the inner peripheral surface of the second connecting portion 29 is recessed so as to form a corner portion, the change in the flow of rainwater flowing in the second connecting portion 29 becomes gradual, and the second connecting portion 29 Vortices and the like are less likely to occur inside. As a result, pressure loss is suppressed in the rainwater flowing in the second connection portion 29, and the funnel 16 can further easily exert sufficient drainage capacity due to the siphon phenomenon. Further, the funnel 16 may receive an external force due to heat expansion and contraction due to a temperature difference between the eaves gutter 11 and the calling gutter 41. Even in such a case, the stress is less likely to be concentrated on the second connecting portion 29 as compared with the case where the inner peripheral surface of the second connecting portion 29 is recessed so as to form a corner portion, and the stress is less likely to be concentrated. 2 The connection portion 29 is less likely to break.

Further, according to the siphon rain gutter system 1 of the present embodiment, the siphon rain gutter system 1 can be configured by using the funnel 16 which facilitates exhibiting a sufficient drainage capacity due to the siphon phenomenon.

The funnel 16 of the present embodiment can be variously modified in its configuration as described below.
As shown in FIG. 3, a case where the funnel 16 configured as described above is fixed to the first elbow joint 56 having an inner diameter larger than that of the first elbow joint 36 described above will be described. The modified funnel 16A used here does not include the second reduced diameter portion 20 and the small diameter tubular portion 21 for each configuration of the funnel 16 of the present embodiment.
The first elbow joint 56 is configured in the same manner as the curved pipe portion 37 and the receiving ports 38 and 39 of the first elbow joint 36 except for the inner diameter and the outer diameter, and includes the curved pipe portion 57 and the receiving ports 58 and 59. The inner diameter of the receiving port 58 is larger than the inner diameter of the receiving port 38 and the outer diameter of the large-diameter tubular portion 19 of the funnel 16A.

As shown in FIG. 4, the funnel 16A is a cut surface S3 in which the funnel 16 is defined between the large-diameter cylinder portion 19 and the second connecting portion 29, and the funnel 16 to the second diameter-reduced portion 20 and the small-diameter cylinder portion are formed. Obtained by separating 21. A known band saw or the like is used for cutting the funnel 16.
As shown in FIG. 3, the large-diameter tubular portion 19 of the funnel 16A is inserted into the receiving port 58 of the first elbow joint 56, and the receiving port 58 and the large-diameter tubular portion 19 are fixed by an adhesive or the like (not shown).
According to the funnel 16 of the present embodiment, the elbow joints connected to the funnel 16 are the first elbow joint 56 having a large inner diameter corresponding to the large diameter cylinder portion 19 and the first elbow having a small inner diameter corresponding to the small diameter cylinder portion 21. It can be selected and used with the joint 36.
A gutter 51 or the like may be connected to the funnel 16 instead of the elbow joint.

The siphon rain gutter system 2 of the modified example shown in FIG. 5 includes a funnel 61 instead of the funnel 16 of the siphon rain gutter system 1 of the present embodiment. The funnel 61 includes a first reduced diameter portion 63 of the main body portion 62 instead of the first reduced diameter portion 18 of the main body portion 17 of the funnel 16 of the present embodiment. In the cross section S1, the inner peripheral surface of the first reduced diameter portion 63 is curved so as to be convex inward, and the outer peripheral surface of the first reduced diameter portion 63 is curved so as to be concave inward. In this modification, the first connecting portion 28 is integrated with the first reduced diameter portion 63 and smoothly connected to each other.
The funnel 61 and the siphon rain gutter system 2 of the present modification configured in this way can also exert the same effects as the funnel 16 and the siphon rain gutter system 1 of the present embodiment.

Further, a case where the funnel 61 (funnel 61A) of the modified example configured as described above is fixed to the above-mentioned first elbow joint 56 as shown in FIG. 6 will be described. The modified funnel 61A used here does not have a second reduced diameter portion 20 and a small diameter tubular portion 21 for each configuration of the funnel 61.

As shown in FIG. 7, the funnel 61A has a cut surface S3 defined between the large-diameter cylinder portion 19 and the second connecting portion 29, and the funnel 61 has a second diameter-reduced portion 20 and a small-diameter cylinder portion 21 from the funnel 61. Can be obtained separately.
As shown in FIG. 6, the large-diameter tubular portion 19 of the funnel 61A is inserted into the receiving port 58 of the first elbow joint 56, and the receiving port 58 and the large-diameter tubular portion 19 are fixed by an adhesive or the like (not shown).

Although one embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and the configuration is changed, combined, or deleted without departing from the gist of the present invention. Etc. are also included.
For example, in the above embodiment, the funnels 16 and 61 do not have to include the second diameter reduction portion 20 and the small diameter cylinder portion 21.
The inner peripheral surface of the second connecting portion 29 may not be curved so as to be recessed toward the outside, but may be recessed so as to form a corner portion. The inner peripheral surface of the third connecting portion 30 may not be curved so as to be convex inward, and a corner portion may be formed on the inner peripheral surface so as to be convex inward.
Further, the siphon rain gutter system may not include the first elbow joint 36, the nominal gutter 41, and the second elbow joint 46, and the funnel 16 and the vertical gutter 51 may be directly connected.

1, 2, Siphon rain gutter system 11 Eaves gutter 16, 16A, 61, 61A Funnel 17, 62 Main body 17a Recess 18, 63 First diameter reduction part 19 Large diameter cylinder part 20 Second diameter reduction part 21 Small diameter cylinder part 24 Bottom Wall part 24a Drop opening 28 First connection part (connection part)
29 Second connection part (connection part)
30 Third connection part (connection part)
51 Vertical gutter D2 Extension direction (direction along the horizontal plane)
O axis S1 cross section

Claims (2)

A funnel that connects the eaves and gutters,
A recess extending upward along a horizontal plane, and both ends in a direction along the horizontal plane are connected to the eaves gutter, and a main body portion.
A first diameter-reduced portion that is connected to the drop opening formed in the bottom wall portion of the main body portion and whose inner diameter gradually decreases toward the bottom.
A large-diameter cylinder portion that is connected to the lower end portion of the first diameter-reduced portion and extends downward.
A second diameter-reduced portion that is continuous with the lower end of the large-diameter cylinder and whose inner diameter gradually decreases toward the bottom.
A small-diameter cylinder portion that is continuous with the lower end portion of the second diameter-reduced portion and extends downward to form an outer diameter smaller than that of the large-diameter cylinder portion.
Prepare,
In the cross section including the axis of the large diameter cylinder portion, the inner peripheral surface of the connecting portion between the first reduced diameter portion and the large diameter cylinder portion has a curvature of 10 mm or more and 60 mm or less so as to be convex inward. Curved at radius ,
In the cross section, the inner peripheral surface of the connecting portion between the large diameter cylinder portion and the second reduced diameter portion is curved with a radius of curvature of 5 mm or more and 40 mm or less so as to be recessed outward.
In the cross section, a funnel in which the inner peripheral surface of the connecting portion between the second reduced diameter portion and the small diameter tubular portion is curved with a radius of curvature of 5 mm or more and 40 mm or less so as to be convex inward . With the eaves gutter,
The funnel according to claim 1, wherein the main body is connected to the eaves gutter .
The first elbow joint connected to the small diameter cylinder portion and
A gutter connected to the first elbow joint and having a horizontal length of 1.5 mm or less.
The second elbow joint connected to the gutter and
With the gutter connected to the second elbow joint and having a length of 3 m or more,
Siphon rain gutter system with.

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