Electrical Connection For Aerated Insulation Coaxial Cables

Abstract

Connection for joining end to end, two sections of coaxial cable, comprising two metallic half-shells having elastic and truncated cone-shaped ends, by centering and fixing the half-shells round the central conductor of the sections and of the ends of their external conductors and clamping the ends of the half-shells onto the ends of the external conductors.

Description

BACKGROUND OF THE INVENTION

Field of the Invention

The invention has for its object a connection for effecting the end-to-end joining of two sections of coaxial cables, more particularly those having aerated insulation by such means as disks or helicoidal elements, or tubes nipped at regular intervals, or disks covered with a tube or a tape.

SUMMARY OF THE INVENTION

The connection of this invention is characterised in that it comprises certain elements.

Two insulating end members, which ensure simultaneously the centering of the conductor and a mechanical reinforcing, are each fitted to the central conductor of a section of cable and each is inserted in the end of the external conductor of respective sections.

Two metallic half-shells, whose ends are chamfered externally and provided with longitudinal slots, bear against the ends of the external conductors of the two sections.

Two metallic rings having a truncated cone shaped internal profile bear respectively against each end of the two half-shells.

A cylindrical metallic sleeve having threaded ends, covers the two half-shells and the ends of the external conductors of the two sections.

Two nuts are fitted onto the external conductors of the two sections and cooperate with the threads of the cylindrical sleeve to clamp the connection assembly.

An intermediate sheath of plastic material covers at least partially the assembly and is possibly fixed to the outer plastic sheath of the external conductors of the two sections.

Other details of embodiment will become apparent from the following description, given by way of an example, of a possible embodiment of a connection according to the invention, with reference to the accompanying drawing.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a longitudinal cut-away view of the connection of this invention in one form.

FIG. 2 is a sectional view of the metallic sleeve forming a part of the connection of FIG. 1.

FIG. 3 is an end view of the sleeve of FIG. 2.

In these Figures, 1 and 1' designate the central conductors of the two sections to be joined together and 2 designates the external conductor of one of the said sections.

The central conductors 1 and 1' are connected together at 3 by a conventional means, such as welding, brazing or crimping, which does not come within the scope of the present invention.

An insulating centering washer 4 is advantageously placed at that point.

An insulating end member 5 comprising, at its external surface, a groove 54 and ending at one end in a stop flange 6 is inserted in the end of each section such as 2. That end piece is preferably made of a material having simultaneously a fairly great mechanical strength and good electrical characteristics such as permittivity and angle of losses as a function of the frequency, such as, by way of an example having no limiting character, polyphenylene oxyde.

Two metallic half-shells 7, 7', which may be better seen in FIGS. 2 and 3, bear against the ends of the external conductors such as 2.

Each of these half-shells comprises ends such as 8, 8', externally chamfered and provided with a certain number of radially disposed longitudinally extending slots such as 9, 9' in order to give then a certain elasticity.

The said ends such as 8, 8' are provided, preferably internally, with serrations in order to be fixed better to the ends of the external conductors such as 2, as shown on FIG. 1.

The said ends comprises also an internal transversal groove 10 in which is accomodated and fixed the flange 6 of the end piece 5.

Lastly, the half-shells comprise, at their middle, an internal transversal groove 11 in which is accomodated and fixed the central washer 4 (FIGS. 1 and 2).

A ring 12 having a truncated cone shaped internal profile is fitted onto the ends such as 8, 8' of the half-shells 7, 7'.

The metallic sleeve 13, threaded at its ends advantageously having in its middle part, flats such as 14, enabling it to be fixed to prevent its rotation, is fitted onto the assembly thus constituted.

Lastly, nuts such as 15, fitted onto the external conductors of the two sections, co-operate with the threading of the ends of the sleeve 13. It will be observed that when these nuts are tightened, they push the rings 12 whose inclined side clamps the elastic ends 8, 8' of the half-shells 7, 7' on the ends of the external conductors 2. These latter, reinforced by the end members 5, are slightly deformed due to the existence of the groove 5A and connected closely by mechanical clamping at the ends of the half-shells 7, 7'.

That assembly may then be covered, wholly or only at its ends, with a plastic intermediate sheath, which is possibly thermo-shrinkable, which provides the fluid-tight sealing of the connection and which, moreover, may, to great advantage, be welded or cemented to an outer plastic sheath, not shown, which could possibly cover the external conductors of the two sections of cable to be connected together.

Claims

I claim:

1. In a device connecting together the external conductors of two sections of disk-insulated coaxial cables whose inner conductors are also connected, said device including two metallic half-shells arranged between the ends of said external conductors, a sleeve covering said half-shells and being internally threaded at its ends, and a nut fitted onto each of said conductors and screwed onto the ends of said sleeve clamping the device to the external conductors, the improvement comprising: an insulating end member fitted into each of the external conductors, and receiving the central conductor and having a flange abutting the end of the external conductor and wherein the two half-shells each have an internal groove which receives the flange of a respective end member, a ring having a tapered internal surface facing the ends of said half-shell, the ends of said half-shells being chamfered on their outer surfaces and provided with longitudinal slots, wherein the two nuts are screwed into the internal threads of the sleeve and clamping, by means of the rings, the ends of the half-shells onto the conductor.

2. The device according to claim 1, wherein: the insulating end members each have a peripheral groove into which the external conductors are deformed.

3. The device according to claim 1, wherein: an insulating and centering disk for the internal conductor is arranged within the half-shells, and received within fixing grooves of said half-shells.

4. The device according to claim 1, wherein: the internal ends of the half-shells are threaded for better adherence to the external conductors of the two sections.

5. The device according to claim 1, wherein the end members and the insulating disk are made of an insulating material having great mechanical strength and good electrical properties.

6. The device according to claim 5, wherein the insulating material is polyphenylene oxide.