JPS58122821A - Cap attaching method to pipe - Google Patents

Abstract

PURPOSE:To perform firm fitting, by forming in the lower face of a cap a concave part which has a tapered face inclining downward from the peripheral part of an upper bottom to an outside, covering with the cap the top end of a pipe of which the outer periphery is covered with a synthetic resin layer and giving supersonic vibration to said cap. CONSTITUTION:In a cap attaching method to a pipe a concave part 5 is formed in the lower face of a cap 3, a tapered face 6 which inclines downward at the inner face of the concave part 5 from the peripheral part of an upper bottom of the concave part 5 to an outside is formed at its total periphery and the top end of the pipe 2 of which the outer periphery is covered with a synthetic resin layer 1 is inserted in the concave part 5 of the cap 3, the top end of the synthetic resin layer 1 is contacted to said tapered face 6, also a clearance 8 is formed between the outer periphery of the top end of the synthetic resin layer 1 and the inner periphery of the concave 5 ranging their total peripheries and a supersonic vibration is given to the cap 3 under these conditions. The cap is fitted firmly to the pipe in such a way.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for attaching a cap to the cut end surface of a pipe whose outer periphery is coated with a synthetic resin layer, such as a grid for summer use on fences, gates, etc. recess (
5) is recessed from the upper bottom surface periphery of the recess i51 to the recess (5).
) is an inclined surface 6 which slopes downwardly toward the outside towards the inner peripheral surface of the
) is formed over the entire circumference, and the upper end of the pipe (2) whose outer periphery is covered with the synthetic resin layer +1) is inserted into the recess (5) of the +sec (3) and the synthetic resin layer 1i is The upper edge is brought into contact with the inclined surface (6) and the synthetic resin layer t1! Between the outer periphery of the upper end and the inner periphery of the recess (6), a gap (
) is formed, and in this state, pressure is applied from above to the cow tip 13), and ultrasonic vibration is applied to the tube (3) using the ultrasonic welding horn (2), thereby forming the pipe (
The cap 13) is fused to the synthetic resin layer 2) + 1), and the cap 13) protrudes outside the synthetic resin layer 1).
This relates to a method for attaching a yappu to a nozzle tube, which is characterized in that the molten resin of 3) is contained within the gap 8).

For metal pipes (2) coated with a synthetic resin layer 11) on the outer periphery, such as lattice pipes used for fences, gates, etc., it is necessary to protect the cut end of the pipe (2) from rust, for safety, and for aesthetics. In order to prevent rainwater from entering the pipe (21), a middle pipe (3) was conventionally attached to the end opening of the pipe (2) as shown in Fig. 1. In the case of (a), the inner tube (3) is installed by fitting the cylindrical part (9) on the outer periphery of the inner tube (3) to the outer circumference of the synthetic resin layer i1) of the pipe (2). In the case shown in Fig. 1(b), the fitting part (11) having sawtooth-like unevenness is press-fitted into the inner circumference of the pipe (2) to attach the middle pipe (3). This is what I decided to do.

However, in the case shown in FIG. 1 (1), rainwater enters into the pipe (2) due to capillary action between the cylindrical part (9) of the pipe (3) and the synthetic resin layer i1). It is not possible to completely prevent rust from forming on one side or the inner circumferential surface of pipe (2), and over time, the middle pipe (3) may become rusty (
2) There was a risk of falling off, and on the other hand, the one shown in FIG. 1(b) similarly could not completely prevent rainwater from entering, and there was a risk of falling off over time.

Therefore, as shown in FIGS. 2(a) and (b), the synthetic 1fI
A cap (3) made of lfWiI is placed on the upper end surface of the pipe (2) and the cap (3) is attached using an ultrasonic welding horn (7).
3) and the end face of the synthetic resin layer 11) of the pipe (2), the molten resin completely prevents the middle cover (3) from falling off and rainwater from entering. This sagging portion H spoils the appearance.

The present invention has been made in view of the above points, and allows the cap to be firmly attached without fear of falling off while completely blocking the intrusion of rainwater. This Ryumei, which aims to provide a method for attaching a middle cover to a pipe by fusion, will be described in detail with reference to examples. −? Yap (3)
is made of thermoplastic synthetic resin such as polyvinyl chloride, and has a recess (5) opening downward on its lower surface. Inside this recess (6) there is a recess (6) as shown in Figure 8.
6) An inclined surface I (il) is formed at a part of the corner from the upper bottom surface to the inner circumferential surface and slopes downwardly toward the outside.

Incidentally, this inclined surface I61 has a recess (5) as shown in FIG.
It may be formed from the upper bottom surface to the lower end of the inner circumferential surface. The outer periphery of the metal J-Eve (2) is coated with a thermoplastic synthetic resin layer (1) such as polyvinyl chloride. The outer diameter of the synthetic resin layer (1) is the same as the inner diameter of the middle part of the inclined surface 1B) of the recess (6), and the outer diameter of the synthetic resin layer i1) is the same as the inner diameter of the middle part of the inclined surface 1B) of the recess (6). It is designed to be smaller than the inner circumferential diameter (in the embodiment shown in FIG. 4, the inner circumferential diameter at the lower end of the inner circumferential surface of the recess (S)).

Therefore, when attaching the ship (3) to the cut end of the pipe (2), proceed as follows. That is, first, the cap (3) is placed on the upper end of the pipe (2) so that the upper end of the pipe (2) is inserted into the recess i5). A cow here? As shown in FIG. 8, the knob (8) is tilted so that the inclined surface I6) comes into contact with one end edge of the synthetic resin layer i1), and therefore the recess [51 and the synthetic resin layer 41]
A gap (8) is formed between the outer periphery of the upper end of the first fat layer (1). Thereafter, an ultrasonic welding horn (7) set on the upper surface of the middle Yap t$1 applies ultrasonic vibration to the Middle Yap (3) while applying a downward pressing force. Then, due to this vibrational energy, +Yap13) and the resultant IN
The contact surface with the fat layer (1) generates heat, causing the +Yap (3) and the synthetic resin layer if) to melt together, and the inner cap (3) and the synthetic resin layer 11) to be fused together. . At this time,
The molten resin of the middle layer 13) is a synthetic wood grain layer 11)
However, this dripping melt 411t
% is contained within the gap tSi and is not exposed to the outside, and the center part of the cap (3) is fitted into the inner circumference of the pipe (2) by pressurization by the ultrasonic welding horn (7). Inserted. In this way, as shown in FIG. 5, the middle cover (3) is fused and integrated with the synthetic resin layer i1), and the center part of the lower surface of the middle cover (3) is attached to the fitting protrusion 14).
The cap (
3) No. 1 is attached to the tube (2), and the molten resin dripping from the cap (3) to the outside of the synthetic resin layer (1) is stored in the recess (5) of the middle cover (3). Since it solidifies while hanging in the gap) 8), this hanging part (J@ is contained in the gap s, 81 and is not exposed to the outside and there is no risk of damaging the appearance. .

Since I fused Ya Sodu to the synthetic resin layer of the pipe, dF? By fusing the tube and the synthetic resin layer, the openings of pipes 1 to 5 are completely sealed, making it possible to completely shut out rainwater from entering the pipe. +? When the lower part of the middle sep is melted by applying downward pressure to the Yap? The center S of the tube fits into the inner periphery of the pipe as a fitting protrusion, and the combined force of this fitting force and the fusion between the tube and the synthetic resin layer firmly attaches the middle tube to the pipe. There is a high risk that the middle class will fall out of favor with the IS Eve over time. Furthermore, the high-volume vibration is +1 with a gap formed between the inner periphery of the recess of -1-17w) and the outer periphery of the synthetic resin layer of l\ive.
7-) Since the molten resin dripping to the outside of the synthetic IRriI layer is contained in the gap and is prevented from being exposed to the outside, it is possible to prevent it from being exposed to the outside and spoiling the appearance. It is preventable.

[Brief explanation of drawings]

Figure 1 (a) and (b) are cross-sectional views of the conventional example, Figure 2 (a)
(b) is a cross-sectional view of another conventional example, FIG. 8 is a cross-sectional view of one exfoliating device used in the method of the present invention, FIG. 4 is a cross-sectional view of another embodiment, and FIG. It is a sectional view of the state where it is attached to a pipe. (1) is a synthetic resin layer, (2) is a pipe, (3) is a hollow, (5) is a recess, (6) is an inclined surface, (7) is an ultrasonic welding horn, and (8) is a gap. It is. Agent Patent attorney Ishi 1) Long upper 1st (a) (t)) Bamboo 2 (-1 (0) (b) T4°゛rod 3μ

Claims (1)

[Claims] (1) A recess is formed on the bottom surface of the cap, and it extends from the circumferential edge of the upper bottom surface of the recess to the inner peripheral surface of the recess toward the outside. 7. Form a sloped surface over the entire surface, and insert the upper end of the 9J~Eve into the +sec recess so that the outer periphery is covered with a synthetic resin layer and the upper edge of the synthetic resin layer is aligned with the above slope. At the same time, a gap is formed around the entire circumference between the outer periphery of the upper end of the synthetic resin layer and the inner periphery of the recess, and in this state, pressure is applied to the cap from one side while using a horn for facial sonic fusion. By applying ultrasonic vibrations to the middle layer, the middle layer is fused to the synthetic resin layer of the pipe, and at the same time it protrudes outside the synthetic resin layer.
A method for attaching a +sec to a pipe, characterized by fitting the molten wood of the love within the above-mentioned gap.