JPH03187458A - Eaves gutter and its manufacture - Google Patents

Abstract

PURPOSE:To avoid the generation of waves and bulges by giving a curve, which projects outward in the cross section in the direction crossing the longitudinal direction of an eaves gutter, to the bottom part of an eaves gutter over the whole length in the longitudinal direction. CONSTITUTION:Many holes 17 are made excepting both ends of a core material 1 consisting of a long steel plate and the parts 3b to become corners parts. Next, through crushing roll, peculiarity of curvature is given by a rubber roll and a waving roll, and then it is covered with synthetic resin 2. And when bending it with a bender, it shrinks longitudinally at the corner part, while the curve 4 resists the stress, and it preserves enough strength in the logitudinal direction of an eaves gutter with the curve 4. Accordingly, it can avoid waves or bulges from occurring at the bottom and the sidewall.

Description

[Detailed Description of the Invention] [Industrial Application Field 1] The present invention relates to an eaves gutter and a method for manufacturing the same, and more specifically, the present invention relates to an eaves gutter and a method for manufacturing the same. It is related to technology that attempts to solve problems.

[Prior Art] Conventionally, square eaves gutters with a metal plate as a core material and covered with a synthetic resin layer on the entire surface have been produced by bending a metal plate coated with a synthetic resin layer, or by bending a metal plate coated with a synthetic resin layer. The core material is bent into a square shape, and the square core material is coated with a synthetic resin layer.

[Problems to be Solved by the Invention] However, when bending a metal plate into a rectangular shape in this way, at both ends of the middle direction of the bottom, the outer side stretches and the inner side contracts, resulting in part of the corner being bent. This shrinkage in the longitudinal direction causes a problem in that a portion of the corner shrinks in the longitudinal direction, causing a so-called bulge or bulge in the center of the bottom and side wall portions. To solve this problem, the invention disclosed in Japanese Patent Publication No. 62-53662 was made. That is, as shown in FIG. 9, wave grooves 4a along the longitudinal direction of the eaves gutter are formed in the core material 1 of the metal plate at intervals in the middle direction of the eaves gutter, and the corrugations 4a are formed in the core material 1 of the metal plate at intervals. The bottom surface 3 and side walls 5 are coated on the entire surface of the synthetic resin bottle 2 while retaining the residual stress that tends to return to its shape and rise, thereby increasing the bending strength in the longitudinal direction of the bottom surface 3 and side walls 5.
This prevents undulations and bulges from occurring in the area. However, in such an invention, when the synthetic resin bottle 2 softens under high temperature conditions, the need for the core material 1 to retain residual stress is reduced, and the residual stress is not retained in the synthetic resin bottle 2. Therefore, it is difficult to suppress undulations and bulges, and there is a problem that undulations and bulges occur on the bottom surface 3 and side walls 5.

The present invention has been made in view of these problems.
The purpose of this is to bend into a square shape.
An object of the present invention is to provide an eaves gutter and a method for manufacturing the same, which can avoid undulations and bulges in the bottom surface and side walls even due to stress caused by shrinkage in the length direction at a part of the corner of the eaves gutter.

[Means for Solving the Problems] The eaves gutter of the present invention is a rectangular eaves gutter in which a metal plate is used as a core material 1 and the entire surface thereof is covered with a synthetic resin bottle 2. A bottom surface portion 3a that is at least the bottom surface 3 of
A curved portion 4 that is outwardly convex in a cross section in a direction perpendicular to the longitudinal direction of the eaves gutter is formed over the entire length of the eaves gutter.

Also, there is a method for manufacturing a rectangular eaves gutter in which a metal plate is used as a core material 1 and the entire surface thereof is coated with a resin layer 2, in which a bottom surface portion 3a that becomes at least the bottom surface 3 of the eaves gutter in the core material 1 of the metal plate is provided.
An outwardly convex curvature is applied to the entire length of the eaves gutter in a cross section perpendicular to the length direction of the eaves gutter, and then the gutter is bent into a square shape. It is.

[Function] In this way, in the core material 1 of the metal plate, the bottom surface portion 3a, which is at least the bottom surface 3 of the eaves gutter, has a curved portion 4 that is convex outward in the cross section in the direction perpendicular to the length direction of the eaves gutter. is formed over the entire length of the eaves gutter, so that the core material 1 of the metal plate is bent and the bent part (part of the corner)
Although the core material 1 shrinks in the longitudinal direction, the curved portion 4 in at least the bottom surface portion 3a of the core material 1 resists the stress,
In addition, the curved portion 4 has sufficient strength in the length direction of the eaves gutter to avoid warping or bulging in the curved portion 4, and such action is not affected by heat as in the conventional case. It is something that cannot be received.

Further, in the core material 1 of the metal plate, at least the bottom surface 3a of the eaves gutter has an outwardly convex curvature in the cross section in the direction orthogonal to the length direction of the eaves gutter. is attached to the entire length of the plate and then bent into a square shape to obtain the same effect as described above, that is,
By curving at least the bottom portion 3a, the stress of shrinking in the longitudinal direction of a part of the corner during bending can be resisted, and the curved portion 4 itself has strength to prevent undulations and bulges from occurring in such places. That's what I do.

[Example 1 Embodiments of the present invention will be described in detail below based on the drawings.

FIG. 1 schematically shows the manufacturing process of an eaves gutter A in which a metal plate core material 1 is embedded, and the core material 1 is formed as follows.

Manufacture of Figure 2! ! uncoiler at
While feeding the long steel plate 1a as the core material 1 in step 6, it is tensioned by a tension roll 7, glued by a roll coater 8, and processed by an ohming device 9 on the roll 7 as shown in FIG. The polyvinyl chloride coating [I2a] which becomes the synthetic resin bottle 2 is extruded from the extruder 11 to form a two-layer coating as shown in FIG. As shown in FIG. 5, it is sized at 12, taken off at 8 and 13, and then bent into a substantially rectangular shape at 14.

As shown in FIGS. 3(a) to (e), the perforating roll 1
5 and the receiving roll 16 at both ends of the metal plate core material 1 (which will become the ears of the eaves gutter) and the part 3 which will become part of the corner during bending.
A large number of holes 17 are formed except for hole b. and tlIJ
The burr 17a of the upper sea urchin hole 17 in Fig. 3(c) is crushed by the upper and lower burr crushing rolls 18 and 18, and at the same time, the burr 17a formed on the entire circumference of the burr crushing roll 18 is used to crush the burr 17a as shown in Fig. 3(c).
Grooving is performed as shown in c), and the pitch P of the grooved grooves is 4 to 51 (Example t' 4, 25 mm).
), groove depth Hhto, 2-0゜5m (0 in the example)
, 3 am), and the thickness t of the steel plate 1a is about 0.1 to 0.2 mm (0.18 in the example). By combining the rubber roll 19 and the corrugated roll 20 with recesses 71120a formed on the entire circumference, grooves as shown in FIG. In such a case, the groove pitch Pa of the roll 2o is about 4 to 5 mm (4.25 Il in the example), and the height Ha is 0.2 to 0.5.
mm (approximately 0.3 m in the embodiment). In the sizing device ji12, the ears 21 are also formed.

FIG. 4 shows the cross-sectional shape extruded from the extruder 13, and the shape shown in FIG. 3(e) before being covered with the synthetic resin layer 2.
The core material 1, which is curved as shown in the figure, has a substantially flat plate shape. T is about 1.2 to 1.65ea (1.4@II in the example).

FIG. 5 shows a cross-sectional shape that has been sized by the sizing device fl12, and the bottom portion 3a and side plate portion 3c are each curved to convex outward. In FIG. 5, the bending radius R is about 380 + am, l is about 150 -, and h is about 5 to 6 mm.

Figure tlIJ6 shows the bending process performed by the bender 14, and the eave gutter A is obtained by bending the entire length at a portion of the corner. When bending, as shown in FIG. 7, only the bottom portion 3a may have a curved shape, and by doing so, the side plate 22 becomes flat as shown in FIG. Eaves gutter A is obtained.

In this way, although the core material 1 of the metal plate is bent and shrinks in the longitudinal direction at the bending point (a part of the corner), the bending portion 4 at the bottom surface portion 3a and side plate portion 3c of the core material 1 is subjected to the stress. In contrast, the curved portion 4 has sufficient strength in the length direction of the eaves gutter, and prevents the curved portion 4 from undulating or bulging. Moreover, such an action is not affected by heat, unlike conventional methods.

Then, the core material 1 of the metal plate is formed with a large number of wave grooves 4a extending in the length direction of the eaves gutter, so that the core material 1 of the metal plate is bent and the bent portion (part of the corner) is formed. When it contracts in the longitudinal direction, the corrugated grooves 4a oppose the shrinkage stress in a portion of the corner, suppressing deformation of the portion of the corner, and avoiding undulations or bulges in the bottom surface 3 and side walls 5.

The synthetic resin layer 2 is connected to the front and back sides of the core material 1 in the hole 17, thereby increasing the bonding force between the core material 1 and the synthetic resin layer 2.

Incidentally, after the core material 1 of the metal plate is bent, the entire surface thereof may be covered with the synthetic resin layer 2.

Further, the core material 1 of the metal plate may not be subjected to the above-described hole processing or groove processing.

Further, if the core material 1 of the metal plate is coated with a primary coating, the coating by the extruder 11 may be a single layer coating.

The curved portion 4 may also be formed by ohming the curved roll 7.

[Effects of the Invention] In short, the eaves gutter of the present invention has an outward convexity in the cross section in the direction perpendicular to the length direction of the eaves gutter, at least in the bottom surface portion of the eaves gutter in the core material of the metal plate. Since the curved part is formed along the entire length of the eaves gutter, at least the bottom part of the core material shrinks in the longitudinal direction at the bending point (part of the corner) when the core material of the metal plate is bent. The stress can be resisted at the curved part of the eaves gutter, and since the curved part has sufficient strength in the length direction of the eaves gutter, it is possible to prevent undulations and bulges from occurring in the curved part. It has the advantage of not being affected by heat unlike the conventional method.

In addition, at least the bottom surface of the eaves gutter in the core material of the metal plate has an outwardly convex curvature in the cross section perpendicular to the length direction of the eaves gutter, which extends over the entire length of the eaves gutter. Since it is attached and then bent into a rectangular shape, the same effect as described above is obtained.In other words, since at least the bottom portion is curved, it is possible to resist the shrinkage stress in the longitudinal direction of a part of the corner during bending. In addition, the curved portion itself has strength, and there is an advantage in that it is possible to prevent bulges and bulges from occurring at such portions.

[Brief explanation of drawings]

Fig. 1 is a schematic explanatory diagram of the manufacturing process of an eaves gutter according to an embodiment of the present invention, and Fig. 2 is the same S! ! Schematic side view of the device, Figure 3 (
a) is a side view of the roll 7 ohming device same as above, FIG. 3(b) is a front view of the "roll 7 ohming g&placement" part of FIG. 3(a), and FIG. 3(e) is a side view of the same as above process. FIG. 3(d) is a plan view of the core material after the above-mentioned hole-drilling process and burring process, FIG. 3(e) is a cross-sectional view of the same as above, and FIG. 4 5(a) and 5(b) are schematic sectional views and detailed sectional views showing the action of going up to the sizing device as above, and FIG. 6 is a bending process as above. FIG. 7 is a cross-sectional view showing the action of the sinong device in another disaster example described above.
Figure 8 is a schematic process diagram of the same as above, and Figure 9 is a perspective view of a conventional eaves gutter, where 1 is a core material, 2 is a synthetic resin layer, 3 is a bottom surface, and 4 is a perspective view of a conventional eaves gutter.
is a curved part.

Claims (2)

[Claims] (1) A rectangular eaves gutter whose entire surface is coated with a synthetic resin layer using a metal plate as a core material, where at least the bottom portion of the eaves gutter in the core material of the metal plate is attached in the longitudinal direction of the eaves gutter. An eaves gutter characterized in that a curved portion that is outwardly convex in a cross section in a direction orthogonal to the eave gutter is formed along the entire length of the eaves gutter. (2) A method for manufacturing a rectangular eaves gutter using a metal plate as a core material and covering the entire surface with a synthetic resin layer, the length of the eaves gutter being at least on the bottom surface of the eaves gutter in the core material of the metal plate. A method for manufacturing an eaves gutter, characterized in that the entire length of the eaves gutter is curved outwardly in a cross section in a direction perpendicular to the direction, and then bent into a square shape.