DE1081535B - Connection of the outer conductors of two lines with coaxial conductors - Google Patents

Description

The invention relates to a connection of the outer conductors of two lines with coaxial conductors by a tubular or cup-shaped contact clamp. With those for high frequency transmission used lines, it is important to train the connecting terminal so that a faultless Current transmission is guaranteed, both of high frequency currents to achieve a The highest possible quality of high-frequency transmission as well as direct currents or alternating currents low frequency in the event that the lines are used to supply power to the lines switched on amplifiers. The contact clamps are only installed when the Cable lengths in the open. Although the contact terminals are generally made of copper or brass are produced, already exists during storage and transport, i. H. before their installation, the danger of a superficial formation of oxide, whereby the contact resistance on the pressed together Contact areas are enlarged and the current transfer is worsened. But also after installation of the contact terminals can their contact surfaces under the action of oxygen or others aggressive gases also oxidize, which further deteriorates the power transmission Can have a consequence.

It is the object of the invention to design the connecting terminals so that always a good and flawless one Current transfer to the contact surfaces is guaranteed. Bs must therefore neither during their Storage a deterioration of the contact surfaces occur even after their installation. To this end the requirement is to provide the contact surfaces with layers that have the highest possible conductivity have and their surface conductivity are largely unaffected by chemical or atmospheric influences. These layers are supposed to be as thin as possible, on the one hand for economic reasons and on the other hand for constructive reasons Reasons so that the additionally provided contact layers do not change the specified Make the dimensions of the clamps necessary. ■

The invention consists in that the current transfer from each outer conductor to the connecting pipe or to the clamping shells via contact layers made of gold, indium, iridium, palladium or platinum. These metals have a property that they have a sufficiently high conductivity and at room temperatures are resistant to chemical influences.

It is advantageous to first have a silver layer on the contact surfaces and only then do the highly conductive and non-corrodible contact layer applied. The connection of the outer conductors

two lines
with coaxial conductors

Applicant:

Siemens & Halske Aktiengesellschaft,

Berlin and Munich,
Munich 2, Witteisbacherplatz 2

Ernst Fischer, Berlin-Lichterfelde,

and Otto Römer, Berlm-Siemensstadt,

have been named as inventors

The contact layer is applied in a known manner, expediently by electrolysis or by vapor deposition.

They are electrical contact devices with coatings of gold, platinum, palladium, indium, Rhodium, ruthenium, chromium, platinum-iridium alloys, Palladium-silver alloys, gold-platinum alloys, etc. known. However, these coatings are not all suitable for the purposes of the invention. So has z. B. the chrome plating known for battery terminals has the disadvantage that it is on the surface Form chromium oxide layers, which can be accepted with battery terminals, but not with connection terminals of coaxial high-frequency lines. In many cases it is the known proposals for sliding contacts, in which · as a result of the mutual sliding of the contact surfaces Existing oxide layers are destroyed by the friction and do not develop during operation can form harmful oxide layers. In contrast, the invention specifically relates to connecting terminals for coaxial high-frequency lines in the form of tubular or bowl-shaped contact clamps with static contact surfaces where. the task mentioned at the beginning and the further specified 'special requirements are present.

The invention is explained in more detail using two exemplary embodiments shown in the drawing.

A tubular connection arrangement is shown in FIGS. 1 and 2, namely FIG. 1 shows the connection partly in side view and partly in longitudinal section and FIG. 2 shows a cross section

0O3 509/305

according to the line AB of FIG. 1. The connection arrangement consists of the connecting tube 1, onto which the nuts 3 in the union can be screwed from the right and left. The ends of the connecting pipe have slots 4, and shortly before the start of these slots, an insulating washer 5 is inserted into the pipe at each end for spacing the inner conductor ends (not shown). The middle part of the tube has a hexagon at 6 so that it can be held in place when the union nut 3 is tightened or loosened. The sleeves 2 are pushed onto the ends of the outer conductors 7 and 8, which are to be connected in a known manner, preferably from a longitudinally extending tubular curved band with the overlying metal band windings 7 'and 8' to serve. The tape windings 7 'and 8', hereinafter referred to as shield tape windings, are inserted into the sleeve 2 up to the step 9, while the outer conductors 7 and 8 are passed through the sleeve and their outwardly bent ends are soldered to the sleeve 2 at the point 11 . The inner conductors of the connection are connected to one another with the help of a sleeve 10, which can either be soldered on or, if its ends are appropriately resilient, can also be designed simply as a sliding connection, in which case the inner conductors can still move relative to one another to a certain extent. In order to achieve the best possible and permanent contact at the transition points from the outer conductor of the coaxial line or from the sleeves 2 placed on the outer conductors to the connecting tube 1, the sleeve 2 is on the outer surface with the contact layer 13 on the one hand and the one over the thread of the Connecting pipe projecting longitudinally slotted end is provided on the inner surface with the contact layer 12.

The embodiment according to FIGS. 3 and 4 provides for the connection of two coaxial conductors by means of a shell-shaped contact clamp, namely FIG. 3 shows the contact clamp partly in view and partly in longitudinal section and FIG. 4 shows a cross section at the point CD of the Fig. 3. The outer conductor terminal consists essentially of two shells 14 'and 14 "with a semicircular cross-section, which are provided at their ends with clamping paws 15' and 15" which have the projections 25 'and 25 "to the shells by means the screws 26 to be able to press firmly onto the outer conductor 16 of the coaxial line. To avoid deformation of the outer conductor under the clamping pressure, a thin-walled support tube 20 is inserted into the end of the outer conductor 19 centered on the outer conductor terminal. In the figure, the tensioning straps are designated by 21, which secure the shielding tape windings 22 at the ends against the outer conductor iter press. In this embodiment, the support tube arranged inside each end of the outer conductor is provided with the contact layer 24 on the outer surface and each clamping shell seated directly on the outer conductor is provided with the contact layer 23 on the inner surface. The use of the contact layers can also be used in the same way in connection terminals of other types for coaxial conductors. For manufacturing reasons, it can be useful to provide the entire clamping device with a corrosion-proof and ίο oxidation-proof coating. It should also be mentioned that the connection itself should be designed to be as resilient as possible, so that reliable contact is guaranteed at all times in the event of inevitable temperature fluctuations.

Claims (4)

Patent claims: Connection of the outer conductors of two lines with coaxial conductors through a tubular or shell-shaped contact clamp, characterized in that that the current transfer from each outer conductor (7/8 or 16) to the connecting pipe (1) or to the clamping shells (14714 ") Contact layers (13/12 or 24/23) made of gold, indium, iridium, palladium or platinum are made. 2. Connection with tubular contact clamp, which consists of a connecting tube with at the ends provided union nuts, according to claim 1, characterized in that on each Tube end on the one hand one above the outer conductor end including shielding tape winding (778 ') arranged sleeve (2) on the outer surface and on the other hand over the thread of the connecting pipe (1) protruding longitudinally slotted end of the connecting pipe on the inner surface with the contact layer (13/12) is provided (Fig. 1). 3. Connection with a cup-shaped contact terminal according to claim 1, characterized in that that arranged inside each outer conductor end support tube (20) on the outer surface and each Clamping shell (14714 ") sitting directly on the end of the outer conductor on the inner surface with the contact layer (24/23) is provided (Fig. 2). 4. A compound according to claim 1, characterized in that each contact layer over a Silver layer is applied. Considered publications:
German Patent Nos. 720500, 848 840;
Austrian Patent No. 163 962;
Swiss Patent No. 218 999;
Patent Specification No. 4371 of the Office for Invention and Patents in the Soviet Zone of Occupation in Germany; British Patent No. 581,597;
U.S. Patent No. 2,417,967;
Brochure "Galvanic finishing of contact parts" from WC Haraeus G. mb H., Platinschmelze in Hanau, supplement to ETZ-A from July 11th. 1952, issue 14. 1 sheet of drawings © 0O9 509/305 5.60