JP2925829B2 - Double wall sheet extruded from synthetic resin - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a double-walled sheet extruded from a two-walled synthetic resin. The two walls extend at least substantially parallel to each other;
And they are connected to each other by partitions (partition walls) extending at regular intervals from each other and at least substantially perpendicular to the wall.

[0002]

BACKGROUND OF THE INVENTION Double-walled sheets, such as those of the present invention, are known per se and are usually made of polycarbonate and have a load acting vertically on walls extending parallel to one another. Bend easily due to influence. For this reason, it is not suitable for use as a glazing, for example, especially for roof glazing, especially for sun lambs and other similar structures that must be able to withstand wind and snow loads. I can't say that.

In order to alleviate this drawback, the structure of the sheet must be increased, but this consumes a large amount of relatively expensive raw material, polycarbonate, while the sheet is relatively expensive. The heavier weight results in a higher load on the supporting structure, thus requiring the supporting structure to be heavier. Further, a double-walled sheet having such a double-walled structure is provided with partitions arranged obliquely between walls extending in parallel with each other so that adjacent partitions form a V-shape. -G have already been proposed. However, it has been found that the double-walled sheet produced in this way collapses with relatively small loads on the walls extending parallel to each other, causing the upper wall of the sheet under pressure to bend.
To alleviate the problems seen with sheets having such V-shaped partitions, the space between the partitions must be reduced and / or the walls under bending pressure are made heavier. I have to. However, this increases the weight of the sheet, so that the disadvantages mentioned above are again a problem.

[0004]

SUMMARY OF THE INVENTION According to the present invention, a partition wall extending obliquely is provided between walls. Each of these partitions extends from the connection point of one wall and the partition wall extending perpendicular to the wall to the connection point of the other wall and the partition wall extending perpendicular to the wall. The diagonal partitions located on both sides of the longitudinal center plane extending at right angles to the other extend from one wall in a direction inclined to each other, and these diagonally extending partitions have a thinner structure than the vertically extending partition. .

[0005] By employing the structure of the present invention, the obliquely extending partition has the effect of a so-called "tension rod" when a load is applied in a direction perpendicular to the walls extending parallel to each other. On the other hand, in the case of a load in the opposite direction, the sheet is bent easily due to its small thickness and therefore does not consume any load, so that the double-walled sheet in this case extends perpendicular to the wall. And exhibits at least substantially the same behavior as a conventional double-walled sheet having only a connecting partition provided between the walls.

[0006]

DETAILED DESCRIPTION The present invention will be described below in detail with reference to the accompanying drawings. The figure is a schematic sectional view of a sheet having a double wall structure according to the present invention. The double-walled sheet 1 shown in the schematic sectional view of FIG. 1 is manufactured by extrusion of polycarbonate and includes two walls 1 and 2 running parallel to each other. The walls 1 and 2 extend at right angles to the walls and are connected to each other by a partition 3 which is formed integrally with the walls. In the figure, a partition wall 4 that extends diagonally each time extends between a connection point between the partition wall 3 and the upper wall 1 and a connection point between the adjacent partition wall and the lower wall 2.
Further, as apparent from the drawing, a partition wall 4 located on one side of a longitudinal center plane 5 extending in the longitudinal (longitudinal) direction of the sheet and at right angles to the walls 1 and 2 has a connection point with the lower wall 2. The direction when extending upward at a certain angle is opposite to the direction when the inclined partition wall 4 located on the other side of the vertical center plane extends upward at an angle from the contact point with the lower wall 2. is there.

When arranging such a sheet, for example as a roof covering, the wall 1 forms a top surface outside the sheet, and thus as shown in the figure, for example. It is arranged such that a downward force acts on the upper wall 1 under the influence of a positive load such as a snow load. When the double-walled structure sheet is easily bent under the influence of this load, the slanted partition wall 4 is in a state where a tensile load is applied, so that the bending is effectively prevented. Such a tensile load can be effectively absorbed by the obliquely extending partition 4 already having a relatively thin structure. Therefore, these partition walls have a structure as thin as practical. Due to the thin structure of the partition walls 4, the inclined partition walls 4 are easily bent because of their small wall thickness. Therefore, when this double-walled sheet is used as a cover of a roof or the like, the direction opposite to the above-described direction is used. When a directional load (for example, a load due to wind) is applied, the load is not absorbed at all. That is, the double-walled sheet of the present invention behaves similarly to a conventional double-walled sheet having only a partition wall extending perpendicular to the wall.

In practice, the preferred construction of the sheet of the present invention is chosen so that wall 1 is somewhat thicker than wall 2. The partition extending perpendicular to the wall is usually selected to be slightly thinner than the wall 2, but the partition 4 extending diagonally is made thinnest. When the configuration of the present invention is adopted, a sheet having a double wall structure which is particularly suitable for a cover of a roof and the like and is excellent in absorbing a bending load during use can be obtained due to an effective material distribution. Can be Nevertheless, the effective distribution of material to the walls and bulkheads allows for a relatively lightweight seal.
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[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a sheet having a double wall structure according to the present invention.

[Explanation of symbols]

 A Double-walled sheet, 1, 2 walls, 3 partitions, 4 diagonal partitions, 5 vertical center plane.

Claims (4)

(57) [Claims] 2. The method of claim 1, wherein the first and second walls extend at least substantially parallel to each other and at least substantially perpendicular to the walls at regular intervals from each other. A double-walled sheet extruded from a synthetic resin, which is connected to each other by a partition wall, the partition wall extending further obliquely being provided between the walls, and each diagonal partition wall is connected to one wall and the wall. Extending from the connection point with the partition wall extending perpendicular to the other wall and the connection point with the partition wall extending perpendicular to the wall, and the diagonal located on both sides of the vertical center plane extending perpendicular to the wall Wherein the partition wall extends obliquely from one wall in a direction opposite to each other, and the diagonally extending partition wall has a thinner structure than the vertically extending partition wall. 2. The double-walled sheet according to claim 1, wherein the angle between the inclined partition walls located on both sides of the longitudinal center plane of the sheet is 90 °. 3. The double-walled sheet according to claim 1, wherein one wall of the sheet has a structure thicker than the other wall of the sheet. 4. The double-walled sheet according to claim 1, wherein a wall of the sheet is thicker than the partition wall.