FR2834759A1 - Self-locking connector for plastic tube comprises tongue pushed between male and female tubes - Google Patents

Abstract

The self-locking connector for abutting a male tube (1) into a female tube (3) comprises a tongue (2,4) preventing the sliding of one tube relative to the other.

Description

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The present invention relates to the joining of rigid plastic tubes of hardness, for example 60 D shore, in the prey of which it has been made by punching one or more tabs allowing the blocking of the male tube in the female tube.

There are already joining systems made either by gluing, or by inserting a gasket or a self-locking ring or a holding wrapping system. These systems have the disadvantage of requiring the addition of an additional article and of resorting to the use of non-ecological chemicals when using glue.

The tongue 2 which is the subject of the invention fig. 1 is cut so that one end goes inside the male tube 1 or outside the female tube 3 if the tongue 2 is cut on the female tube, and the other end of the tongue remains secured to the tube wall thus rotating.

The male tube while advancing in the female tube fig. 2, partially flaps the tongue to its initial position without the latter fully resuming its housing because a burr 5 at the peripheral edge fig. 3 was made when cutting the tongue on the side of the opening or opening part appearing inside the wall of the female tube 1. This burr preventing the tongue 4 from completely resuming its housing and thus creates a sufficient excess thickness to allow jamming of the rigid male tube 3 in the female tube 1. The jamming effect is all the more important as the thickness of burr 5 is important. This present invention is effective in the measurement where the junction of the tubes is done on diameters adjusted with a play of a few tenths of a millimeter.

By way of nonlimiting example, the present invention has been applied to a tube 3 made of rigid plastic with an outside diameter of 50 mm and a thickness of 3 mm, inserted inside a tube 1 with a tulip at 50.2 mm leaving a clearance of 0.2 mm with the tube diameter of the tube 3. After having cut a tab of length 10 mm and width 6 mm with a burr 5 on the outlet 4 of width 0.25 mm, ie a width of 6.5 mm total on the outlet of the outlet we found after introduction of the tube 3 a tensile force of about 6 kg necessary to completely remove the tube 3.

A second test carried out using a wider burr of width 0.5 mm caused 1 t, at the time of punching by a matrix of width 7 mm and a punch of 6 mm, after introduction of the male tube 3 we have noted a tensile force of approximately 20 kgs.

Claims (3)

CLAIMS 1-Device for joining two tubes to the male tube entering a female tube with an outside diameter substantially smaller than the inside diameter a female tube comprising means for preventing the sliding of one tube relative to the other, characterized in that said means are constituted by at least one depression of the material of a tube in the direction of another tube. 2-Device according to claim characterized in that the depression is carried on the female tube and forms a tongue projecting inside the tube. 3-Device according to claim 2 characterized in that the tongue has on one end and / or its periphery a burr preventing the tongue from resuming its housing.