JPH09317095A - Eaves gutter and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make easy to form a bend in an eaves gutter which is shaped in gutter form as having a bend at least in one part from a composite plate of such a structure that a core of a metal sheet is enclosed with resin layers. SOLUTION: An eaves gutter concerned is made from a composite plate 10 of such a structure that the two surfaces of a core of metal sheet 6 are enclosed with resin layers 7, and the composite plate 10 is shaped in a gutter form having a bend 8 in at least its one part. In the inner resin layer 7 where the bend 8 is to be formed, an undulated surface portion 9 with wall thickness varying approx. undulately is previously formed as stretching in the longitudinal direction, and the part is processed into a curved surface so that the intended bend 8 is accomplished.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an eaves trough and a method for manufacturing the eaves trough, and more specifically, a composite plate having a metal thin plate as a core material and a surface coated with a resin layer is used to have a curved portion at least in part. The present invention relates to a gutter-shaped eaves trough and a manufacturing method thereof.

[0002]

2. Description of the Related Art Conventionally, eaves gutters are known which are formed by using a composite plate having a thin metal plate as a core material and the surface of which is covered with a resin layer as a material. As eaves gutters of this type, those having various designs in which the above composite plate is bent and formed into various shapes are known. In addition, among the eaves gutters having various shapes as described above, one having a curved portion curved in a curved shape is also known as a part of the structure.

[0003]

However, in the eaves gutter having a design having a curved portion in part as described above, the composite plate is subjected to curved surface forming processing in order to form the curved portion. However, at this time, on the inner surface side of the curved portion, a compressive force acts on the resin layer to cause wrinkles and other distortions on the surface and repulsive force in the restoring direction, which makes it difficult to form the curved portion. It was

The present invention has been made in view of the above circumstances, and is formed into a gutter shape having a curved portion at least in part by using a composite plate in which a thin metal plate is used as a core material and the surface thereof is covered with a resin layer. Provided is an eaves trough in which a curved portion is easily formed, and a method for manufacturing the eaves trough.

[0005]

In order to solve the above problems, the eaves gutter of the present invention is composed of a composite plate in which a metal thin plate is used as a core material and both surfaces thereof are coated with resin layers. In an eaves trough formed in a trough shape having a curved portion in a part, in a resin layer on the inner surface side of the position where the curved portion is to be formed in the composite plate, a corrugated surface portion having a substantially corrugated wall thickness is elongated. It is characterized in that it is formed in advance along the direction, and this position is curved to form the curved portion.

In this eaves trough, the corrugated surface portion formed on the resin layer inside the curved portion has a compressive force acting on the resin layer on the inner surface side when the curved surface is formed by molding the composite plate to form the curved portion. The resulting strain is absorbed and the repulsive force is reduced.

According to the method for manufacturing eaves gutters of the present invention, a strip-shaped composite plate in which a thin metal plate having a substantially flat plate shape is used as a core material and the surface thereof is covered with a resin layer is formed into a gutter shape having a curved portion at least in part. In the manufacturing method of eaves gutter, the corrugated surface portion consisting of the uneven strips continuous in the longitudinal direction is formed in advance in the resin layer at the position where the curved portion is to be formed in the composite plate, and this position is curved to form It is characterized in that a curved portion is formed.

In this method of manufacturing the eaves gutter, since the composite plate is curved at the position of the corrugated surface portion formed in advance to form the curved portion, the compressive force acting on the resin layer on the inner surface side of the composite plate. The distortion caused by is absorbed by the corrugated surface portion and the repulsive force generated in the curved portion is reduced.

In this method of manufacturing an eaves trough, the corrugated surface portion is formed by extruding a substantially flat plate-shaped thin metal plate between molds and coating the both surfaces with a resin to form the composite plate. It is convenient if they are formed at the same time as the resin layer is formed by the resin coating at the position to be formed.

When forming the curved portion by forming the curved surface of the composite plate, if the forming of the curved surface is performed by gradually bending it in a plurality of steps, the repulsive force generated at each step is released. Therefore, a large repulsive force is not generated at one time during the whole process of forming the curved surface.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing an eaves gutter according to an embodiment of the present invention. As shown in the figure, the eaves trough according to the embodiment is composed of a composite plate 10 in which a metal thin plate 6 is used as a core material and both surfaces thereof are covered with a resin layer 7, and the composite plate 10 is provided with a curved portion 8 at least partially. The resin layer 7 on the inner surface side where the curved portion 8 of the composite plate 10 is to be formed has a corrugated surface portion 9 having a substantially corrugated thickness along the longitudinal direction. It is formed in advance and the curved portion 8 is formed by forming a curved surface at this position.

Explaining the eaves trough according to the embodiment in more detail, the eaves trough is a gutter-shaped composite plate 10 in which both sides of a metal thin plate 6 such as a steel plate is coated with polyvinyl chloride to form a resin layer 7. As shown in FIG. 1, the molded product includes a bottom plate 1, a front plate 2 and a rear plate 3 standing up and down on the bottom plate 1, and front and rear ears 4 at the upper ends of the front plate 2 and the rear plate 3. The rear ears 5 are formed respectively. Front plate 2
Rises obliquely upward and rearward from the front end of the bottom plate 1 through a curved portion 8 that curves in an arc shape. The rear plate 3 stands up at a substantially right angle from the rear end of the bottom plate 1.

In this eaves trough, a corrugated surface portion 9 having a substantially corrugated wall thickness in the longitudinal direction is formed on the inner surface side of the curved portion 8 of the composite plate 10 before the curved portion 8 is formed by being curved. It is formed in advance. Therefore, when the curved portion 8 is formed by performing the curved surface molding on the composite plate 10, the distortion generated in the resin layer 7 on the inner surface side of the curved portion 8 is absorbed by the corrugated surface portion 9, whereby the repulsive force acting in the restoring direction is generated. The force required for forming the curved surface can be reduced, and the curved portion 8 can be easily formed.

The method of manufacturing this eaves gutter is as follows. First, ears are formed by roll forming on both left and right edges of a metal thin plate 6 such as a substantially flat plate-shaped steel plate, and the metal thin plate 6 is placed between the molds. A resin layer 7 is formed by extruding and coating polyvinyl chloride on both surfaces thereof, and a composite plate 10 is obtained.
At this time, at the same time as forming the resin layer 7, the corrugated surface portion 9 is continuously formed in the longitudinal direction on the resin layer 7 on the inner surface side of the composite plate 10 where the curved portion 8 is to be formed.

Next, a curved surface is formed at the position where the corrugated surface portion 9 is formed on the composite plate 10 to form the curved portion 8. At this time, in the curved portion 8, the corrugated surface portion 9 is on the inner surface side, and the unevenness of the wall thickness of the resin layer 7 in the corrugated surface portion 9 absorbs the strain generated on the inner side surface of the curved portion 8 and repels in the restoring direction. It reduces power. In this way, the bending portion 8
By locally reducing the repulsive force of the composite plate 10 that hinders the formation of the curved surface for forming the curved portion 8 at the position where the curved portion 8 should be formed, the curved portion 8 can be easily formed. Further, the corners of the composite plate 10 are bent by a bender or the like to form a predetermined gutter shape, and an eaves gutter as shown in FIG. 1 can be obtained.

FIG. 2 is a sectional view showing an eaves gutter according to another embodiment of the present invention. The eaves trough according to the embodiment uses the same composite plate 10 as the eaves trough of the above-mentioned embodiment, but as shown in the figure, the design shape is different from the eaves trough of the above-described embodiment. There is something.

That is, the eaves gutter is provided with a bottom plate 1, a front plate 2 and a rear plate 3 which rise from the front and rear edges of the bottom plate 1 at a substantially right angle, and the front ears 4 are provided at the upper ends of the front plate 2 and the rear plate 3. And a rear ear 5 are respectively formed, and the front plate 2 stands up higher than the rear plate 3, and
A convex portion 11 protruding forward is provided in the middle of the front plate 2,
Further, a substantially semi-circular curved portion 8 that protrudes forward and bends upward is provided at the upper end portion of the front plate 2, and the front ear 4 is formed at the tip portion of the curved portion 8.

Also in this eaves gutter, as in the case of the eaves gutter of the above-described embodiment, on the inner surface side of the curved portion 8 of the composite plate 10, before forming the curved portion 8 by forming the curved surface, the meat is formed into a substantially corrugated shape. The corrugated surface portion 9 of which the thickness changes is formed in advance along the longitudinal direction. Therefore, when the curved portion 8 is formed by forming the curved surface on the composite plate 10, it becomes easy to form the curved portion 8 as in the case of the above embodiment. Here, the shape of the corrugated surface portion 9, that is, the size and interval of the unevenness in which the thickness changes in a substantially corrugated shape is adjusted according to the bending rate of the bending portion 8 and the thickness of the resin layer 7, and for example, Curved part 8 has a radius of 20 mm
And the thickness (one side) of the resin layer 7 is 0.61.
In the case of 5 mm, the pitch of the unevenness can be 4.25 mm and the depth of the unevenness can be 0.3 mm.

The method of manufacturing this eaves gutter can be carried out in the same manner as in the above-mentioned embodiment. In the eaves trough according to the embodiment, the curved portion 8 is formed into a curved surface, and the convex portion 11 is formed at the same time. The curved portion 8 and the convex portion 11 are formed gradually. It is performed by a shoe plate that is bent and molded. That is, as shown in FIG. 3, in the initial stage a, the substantially flat composite plate 10 is
As shown in steps b to f, the curved portion 8 and the convex portion 11 are formed by gradually bending in five steps. In this way, by bending the bending portion 8 in a plurality of stages, the repulsive force of the composite plate 10 at each stage is small,
Further, since the repulsive force can be released each time the process proceeds to the next stage, a large repulsive force is not generated at one time during the whole process of forming the curved surface, and the curved portion 8 can be easily formed.

[0021]

As described above, according to the eaves gutter of the present invention, the corrugated surface portion formed on the resin layer inside the curved portion is formed when the composite plate is curved to form the curved portion. The strain caused by the compressive force acting on the resin layer on the inner surface side is absorbed, and the repulsive force is reduced. Therefore, the eaves gutter can be easily formed with the curved portion.

According to the method for manufacturing eaves gutter of the present invention,
Since the curved surface is formed by molding the composite plate at the position of the corrugated surface portion formed in advance, the distortion caused by the compressive force acting on the resin layer on the inner surface side of the composite plate is caused by the corrugated surface portion. The repulsive force absorbed and generated in the curved portion is reduced. Therefore, the curved portion can be easily formed.

In this method of manufacturing an eaves gutter, the corrugated surface portion is formed by extruding a substantially flat plate-shaped thin metal plate between the molds and performing resin coating on both surfaces thereof to form the composite plate. It is convenient if they are formed at the same time as the resin layer is formed by the resin coating at the position to be formed.

Further, in forming the curved portion by forming the curved surface of the composite plate, if the forming of the curved surface is performed by gradually bending in a plurality of steps, the repulsive force generated at each step is released. Therefore, a large repulsive force is not generated at one time during the entire process of forming the curved surface, and the curved portion can be formed more easily.

[Brief description of drawings]

FIG. 1 is a sectional view showing an eaves gutter according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing an eaves gutter according to another embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a method of forming an eaves gutter in the same embodiment.

[Explanation of symbols]

 6 Metal thin plate 7 Resin layer 8 Curved part 9 Corrugated surface part 10 Composite plate

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masaki Maekawa 1048 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Works Co., Ltd.

Claims (4)

[Claims] 1. An eaves trough formed by a composite plate having a thin metal plate as a core material and both surfaces thereof covered with a resin layer, the composite plate being formed into a gutter shape having a curved portion at least in a part thereof. A corrugated surface portion whose wall thickness changes in a substantially corrugated shape is formed in advance in the resin layer on the inner surface side of the position where the curved portion of the composite plate is to be formed along the longitudinal direction, and the curved portion is formed at this position by curving the curved portion. Eaves gutter characterized by being formed. 2. A method for manufacturing an eaves gutter, wherein a strip-shaped composite plate having a substantially flat strip-shaped thin metal plate as a core material and a surface thereof covered with a resin layer is formed into a gutter shape having a curved portion at least in a part thereof. A corrugated surface portion having a substantially corrugated thickness is formed in advance in the resin layer at the position where the curved portion is to be formed in the composite plate along the longitudinal direction, and this position is curved to form the curved portion. A method for manufacturing an eaves gutter, which comprises: 3. A resin is applied by the resin coating at a position where the curved portion is to be formed in forming a composite plate by extruding a substantially flat plate-shaped thin metal plate between molds and performing resin coating on both surfaces thereof. The method for manufacturing an eaves gutter according to claim 2, wherein the corrugated surface portion is formed at the same time when the layer is formed. 4. The curved surface forming of the composite plate to form the curved portion is performed by gradually bending the curved surface forming in a plurality of steps. 3. The method for manufacturing eaves gutter according to 3.