Connection device for a plastic tube

Abstract

The invention relates to a connection device for a plastic tube (1), comprising a connection nipple (2) that receives the plastic tube (1) and forms an outer cone (6) widening towards the free nipple end. An expansion ring (5) that can be slid over the outer cone (6) and comprises outwardly protruding retaining claws (7) is provided between the outer cone and an axial abutment (11), said expansion ring being supported on the axial abutment (11) of the connection nipple (2) by means of a supporting ring (9). Said device also comprises a sleeve (4) surrounding the plastic tube (1) that has been pushed onto the connection nipple (3) and gripping in a traction-resistant manner onto an abutment flange (3) of the connection nipple. In order to create advantageous assembly conditions, a rubber-elastic spring ring (8) is arranged between the expansion ring (5) and the supporting ring (9). The expansion ring (5), the supporting ring (10) and the spring ring (8) are interconnected in a shear-resistant manner.

Description

Technical field [0001] The invention relates to a connecting device for plastic pipes. The connecting device is provided with a connecting joint for receiving the plastic pipe and a sleeve which is tensile-jointed on the stop flange of the connecting joint and surrounds the plastic pipe on the connecting joint. Barrel, wherein the connecting joint forms an outer cone that expands toward the free joint end, and an expansion ring slidably sleeved on the outer cone is arranged between the outer cone and the axial stop, and the expansion ring has an outwardly convex The extended retaining claw is supported on the axial stop of the connection joint through a supporting ring. Background technique [0002] In this type of known connection device (AT410706B), the plastic tube is sleeved on the connection joint, which supports an expansion ring with retaining claws protruding outward in the area of ​​the outer cone, so that the plastic The tube slides over an expansion ring located in th...

AI Technical Summary

Problems solved by technology

However, this structure has some disadvantages in terms of its functionality

As a result, not only is the installation time consuming, but there is also the risk that, when the plastic tube is slid onto the connection piece, the elastic support ring is pressed out of its receiving groove into the gap between the connection piece and the sleeve and along the connection The joint moves, which impairs the elastic function of the support ring, so that the defined pressing force for the retaining jaws arranged against the inside of the pipe can no longer be ensured

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