JPS5953853B2 - Manufacturing method for synthetic resin branch joints - Google Patents

Abstract

PURPOSE:To manufacture the title joint with perfectly firm connection at the branched part irrespective of variation in branching pipe diameter, by inserting a spherical mold into a synthetic resin pipe followed by lifting the mold up a little above the site to be branched to form the opening where another synthetic resin pipe is to be connected.

Description

[Detailed description of the invention] The present invention relates to a method for manufacturing a synthetic resin branch joint.

A hole is drilled in the peripheral wall of a synthetic resin pipe, the peripheral edge of this hole is heated and softened, and a mold having a diameter larger than the hole is pulled out from inside the tube to raise the peripheral edge of the hole, and a branch short pipe is inserted into this raised part. It is well known to connect and produce branch joints.

According to this method, the diameter of the rising part is regulated by the outside diameter of the drawing die and becomes constant, but the synthetic resin pipe for branching connected to this rising part varies within an allowable range, so this synthetic resin pipe for branching There may be cases where it is difficult to insert and connect the resin pipe into the rising portion.

This invention has been made in view of the above points, and its gist is that a hole is bored in the peripheral wall of a synthetic resin pipe, the peripheral edge of the hole is heated and softened, and a substantially spherical mold is inserted into the pipe. ,
Pull the spherical mold outward from the hole to raise its peripheral edge and place it in contact with the rising part, and press the end of the short synthetic resin tube for branching against the spherical mold from the outside. Then, the outer peripheral surface of the short tube is aligned with the inner surface of the rising portion, and the short tube and the rising portion are directly bonded, or the rising portion is cooled, the short tube is once pulled out, and the short tube is attached to the rising portion. The present invention relates to a method for manufacturing a synthetic resin branch pipe joint, which is characterized in that the joint is inserted into a joint and bonded to the joint.

Next, the method of the invention will be further explained with reference to embodiments shown in the drawings.

J1 is a synthetic resin pipe such as a hard vinyl chloride pipe, and a hole 11 can be bored in the center of this synthetic resin pipe 1.

The diameter of this hole 11 is of course smaller than the diameter of the resin tube 1, and may be an elliptical hole or an elongated hole that is long in the tube axis direction. The peripheral edge of this hole 11 is heated and softened. The heating and softening range ranges from the center of the hole 11 to the spherical mold 2 described below.
Preferably, the width is approximately equal to the radius of. Next, a spherical mold 2 is inserted into the synthetic resin tube 1 (Fig. 1). The chain 3 is locked to the hook hook 21 of the spherical mold 2 through the hole 11, and the chain 3 is raised by an appropriate means and the spherical mold 2 is pulled outward. The heat-softened portion is raised along the outer periphery of the spherical mold 2 (Fig. 2).
The spherical mold 2 is substantially composed of a spherical body whose shape is approximately the same as that of the short synthetic resin tube 4''5 for branching.

If only the periphery of the hole 11 is raised with the spherical mold 2, the rising part 12 will recover along the spherical surface of the spherical mold 2, and the inner diameter of the rising part 12 will cover the entire surface, since the rising part 12 has the property of restoring in a softened state. It is not equal to the outer diameter of the spherical mold 2.

Therefore, while the spherical mold 2 is in contact with the rising portion 12, the tip of the branching synthetic resin short tube 4 is applied from the outside to the spherical mold 2 and pressed, so that the outer circumferential surface of the short tube 4 is Rising part 1
2 Push in from the outside while aligning with the inner surface (Figures 3 and 4)
.

The spherical mold 2 is provided with a guide groove 22 for the branching synthetic resin short tube 4 on its outer surface, and the tip of the branching short tube 4 is inserted and pushed into the guide groove 22. In this state, the rising part 1
After the mixture is cooled and solidified, the branching short tube 4 and the spherical mold 2 are pulled out. Adhesive is applied to the outer peripheral surface of the tip of the short branching pipe 4, and the short pipe 4 is inserted into the rising portion 12 and bonded.

In this way, a synthetic resin branch joint is obtained (FIG. 5). still,
Instead of pulling out the branching short pipe 4 from the rising portion 12, it is also possible to apply an adhesive in advance, cool and solidify the rising portion 12, and then adhere it to the rising portion 12 as it is. As described above, the method of this invention involves inserting a substantially spherical mold into a synthetic resin pipe and pulling it outward to raise the peripheral edge of the hole. It is possible to form up to the rising part of the rising part, and the short branch synthetic resin pipe to be connected is placed in a spherical mold and pushed into the pipe from the outside while aligning the outer peripheral surface with the inner surface of the rising part. The inner diameter and shape of the section are the same as the outer diameter and shape of the short synthetic resin pipe for branching.

Therefore, it becomes extremely easy to connect the branching synthetic resin short pipe to the rising portion.

[Brief explanation of the drawing]

1 to 4 are longitudinal sectional views showing an embodiment of the method of the present invention in the order of its steps, and FIG. 5 is a longitudinal sectional view of an example of a synthetic resin branch joint manufactured by the method of the invention. DESCRIPTION OF SYMBOLS 1... Synthetic resin pipe, 11... Hole, 12... Standing part, 2... Spherical mold, 22... Guide groove, 4... Synthetic resin short tube for branching.

Claims (1)

[Scope of Claims] 1. A hole is made in the peripheral wall of a synthetic resin pipe, the peripheral edge of the hole is heated and softened, and a substantially spherical mold is inserted into the pipe, and the spherical mold is pushed outward from the hole. Raise the peripheral edge of the tube and place it in contact with the rising portion, and press the end of the branching synthetic resin short tube from the outside against the spherical diameter so that the outer circumferential surface of the short tube is raised against the rising portion. Synthesis characterized in that the short tube and the rising portion are bonded as they are along the inner surface of the section, or the short tube is once pulled out after the rising portion has been cooled, and then the short tube is inserted into the rising portion and bonded. Manufacturing method for resin branch pipe joints. 2. The method for manufacturing a synthetic resin branch pipe joint according to claim 1, wherein the spherical mold is provided with an end guide groove for a short synthetic resin pipe for branching on its surface.