JPS5832014B2 - How to make a joint for plug-in connection of square gutter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a plug-in connection device for the end of a polygonal vertical gutter, such as a square, pentagon, or hexagon, which is manufactured by bending a flat strip metal blank into a rectangular tube shape. The present invention relates to a method of integrally manufacturing a joint part.

Conventionally, a means for absorbing the shrinkage of the circumference due to squeezing is to cut out each part of the flat metal blank corresponding to each bent part of the joint part from the base of the joint part to the free edge. was being taught.

However, when using this method, each side plate part of the joint part is connected to the square gutter integrally, but because it is separated at the bending part of the joint part, the road end part of each side plate part is fixed in a square shape. In order to position and form the desired joint, each side plate must be joined and fixed by brazing after bending, which has the disadvantage of increasing product cost due to the complicated process. Ta.

In view of these points, the present invention provides a plug-in joint for a square vertical gutter that has excellent rain shutoff performance without the need for a heat process such as brazing.
The purpose is to provide a method that can be manufactured easily and at low cost.

Next, an embodiment of the method of the present invention will be explained based on illustrative drawings. A flat strip-shaped blank metal plate 1A (such as a galvanized iron plate) is folded along three fold lines a that are parallel to each other. At the end of the square gutter 1 produced by bending, each side plate part of the end part is bent inward, and each side plate part is placed on the free end side of the inward bending line. By folding them so that they are parallel to each other, a rectangular cylindrical plug-in joint part 2 for connecting to another rectangular vertical gutter 1' end is integrally produced.
First, as shown in FIG. 2, at the base of the joint part 2, through-holes 3 are formed at the ends of the metal blank 1A corresponding to the four corners 1B. A notch 4 is provided at each free end of the metal blank portion 1a corresponding to the side plate portion 2a of No. 2.
To give form to...

The through hole 3... is located between the inward bending line and the folding line C of the portion 1b of the metal blank 1A corresponding to the inwardly bending side plate part 2b of the joint part 2. Broken line a located between
. . . The part and the end lines on both sides of the metal blank 1A are considered as one side, and the fold line C is located between the fold line a and the both end lines of the metal blank and a position a predetermined distance away from the fold line a...
By removing the right triangular part with the other side being the other side, the shrinkage of the circumference of the metal blank part 1b due to bending into a rectangular tube shape and inward bending can be absorbed. The shape is as strong as possible, and it extends between the folding line C and a position a predetermined distance away from the folding line C toward the free end side of the metal blank portion 1a corresponding to the side plate portion 2a of the joint portion 2. By removing a right triangular part with one side of the fold line a located at the bend line a... and both end edges of the metal blank and the other side of the fold line C, It is formed to absorb the shrinkage of the ridge near the base of the metal blank portion 1a.

The cutouts 4 are located along adjacent broken lines a, a, etc. of the metal blank portion 1a corresponding to the side plate portion 2a of the joint portion 2.
An isosceles triangular part located between the gap and fold line a and both edges of the metal blank, with the base extending over a predetermined length of the free edge, and the apex of which is located near the fold line C. By omitting the above-mentioned through-hole 3, the shrinkage of the circumferential length of the metal blank portion 1a, excluding the vicinity of the base portion, due to bending into a rectangular tube shape and inward bending can be reduced. It is formed to be absorbed by the body.

Next, the metal blank 1A is bent along each fold line a to form a rectangular tube shape, and then bent along the inward bend lines and then folded back to form a rectangular vertical gutter. A rectangular tube-shaped joint part 2 having a circumference smaller than that of the rectangular vertical gutter 1 and similar to the cross-sectional shape of the rectangular vertical gutter 1 is prepared at the end of the rectangular vertical gutter 1.

In addition, FIG. 5 shows another embodiment, in which the side plate portion 2 of the joint portion 2
A is formed with a wavy constricted portion 4' in order to absorb the shrinkage of the circumference due to bending into a rectangular tube shape and inward bending by the through hole 3.

In summary, the method for manufacturing a joint part for plug-in connection of a square vertical gutter according to the present invention is based on the method of manufacturing a joint part for plug-in connection of a square vertical gutter by dropping the circumference inward at the root part of the joint part 2 in the flat metal blank 1A and at a location corresponding to the corner part. A through hole 3 is formed with a width and length sufficient to absorb the contraction of the joint portion 2.
A portion 4, such as a notch or a wavy constriction portion, is formed on the free edge of the joint portion 2 to absorb circumferential shrinkage caused by bending the joint portion 2, and in this state, the metal blank 1A is Since it is characterized by being bent into a rectangular tube shape, it has the following advantages.

That is, the through holes 3 formed at the corners absorb shrinkage of the circumference of the root side, and at the same time, shrinkage of the length of the free end side is also absorbed by the notch, wavy constriction, etc. Since each corner of the joint part can be continuous at the free end part, the free end part of the joint part itself can be maintained in a square tube shape, and therefore,
The joint can be manufactured by only bending.

In addition, although it is necessary to form through holes 3 and portions 4 such as notches and wavy constrictions in the flat metal blank, these can be easily formed in one process, so productivity is reduced. can be kept in good condition.

Therefore, according to the present invention, it has become possible to easily manufacture a connecting portion of a square vertical gutter having excellent rain shutoff performance with high productivity and at low cost.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the method of manufacturing a joint for plug-in connection of a square vertical gutter according to the present invention, and FIG. 1 is a partially cutaway side view showing the gutter in a plug-in connection state, and FIG. 2 is a folded side view. FIGS. 3 and 4 are perspective views showing the bending process, and FIG. 5 is a perspective view showing another embodiment. DESCRIPTION OF SYMBOLS 1... Strip metal blank plate, 2... Fitting for plug-in connection, 3... Through hole.

Claims (1)

[Claims] 1. A method of integrally manufacturing a joint part 2 for plug-in connection at the end of a square vertical gutter 1 produced by bending a flat strip metal blank 1A into a rectangular tube shape, the flat metal blank 1A A through hole 3 is formed at the base of the joint part 2 and at a location corresponding to each corner, having a width and length sufficient to absorb the shrinkage of the circumference due to inward dropping. At the same time, a portion 4 capable of absorbing circumferential shrinkage due to bending of the joint portion 2 is formed on the free end edge of the joint portion 2, and in this state, the metal blank 1A is A method for manufacturing a plug-in joint for a square vertical gutter, which is characterized by being bent into a square tube shape.