US2223116A - Tubular conductor - Google Patents

Description

U. MEYER ETAL 2,223,116

TUBULAR CONDUCTOR.

Filed Dec. 28, 1937 Patented Nov. 26, 1940 TUBULAB CONDUCTOR A BraumandFransUnterl Mulheim. Colognaandclemenskern, Germany, limon to and August Llndlau. Cologne-Mannini,

Felten Guilleaume carlswerk Act-ien Gesellschaft, Cologne-Mul.

heimGermany Application December z8, 1931, Serial No. 182,128 In Germany January 23, 1937 2 claims, (ci. 174-130) The present invention relates to tubular conductors and particularly pertains to improvements in cables of the air space insulation type.

In a co-pending application maturing as Patent No. 2,165,737 it has been proposed to manufacture tubular conductors from a plurality of metal bands, more particularly as an outer conductor for high frequency cables, by providing the metal bands along their longitudinal edges with indentations at definite distances from one another. The indentations of adjacent bands were preferably staggered relatively to one another. Bands provided with such indentations are prevented frombeing individually laterally displaced. The object of the present invention isto provide an improvement of such tubular conductors.

In the case of concentric conductors for high frequency currents it is important that the diameter of the outer conductor, measuredv at great distances apart, shall be as uniform as possible, otherwise the impedance will be subjecty to fluctuations. It has been found that bands which are provided at short distances apart, with indentations in theform of transverse grooves, mutually support one another very well, since the transverse grooves prevent the bands from sliding over one another. According to the invention this is ensured to a large extent by the metal bands being provided with indentations in the form of transverse grooves and by being preshaped in such a way that, after they have been stranded together, a circular cross-section is obtained. Around the tubular conductor there vis preferably wound a further band with a comparatively short laying length in order to keep together the bands of the outer conductor. An outer conductor, constructed in the manner referred to, is pressure resisting and also very nexible, even when thethiclmess of the outer conductor is small.

In order further to increase the stability the transverse grooves may, according to the invention, be provided with projecting parts. The projections engage with the bands which abut against one another and prevent a lateral displacement between the bands, while a relative longitudinal displacement is possible in the interval between the consecutive projections. An unlimited possibility of displacement in the longitudinal direction may be obtained by providthe two bands abutting against ting out portions of the transverse grooves of the other band at the abutting edge. so that the projections of the one band can slide past at these points.

Other and further features and objects of the invention will be apparent from a consideration of the accompanying drawing and the following 5 description ywherein an exemplary embodiment of the invention is disclosed.

In the drawing:

Fig. 1 is a plan view of a cable embodying the invention with parts broken away. i

Fig. 2 is a perspective view of the bands provided with transverse grooves and illustrating the projecting partsr Fig. 3 is an end view of the conductor bands shown in Fig. 2.

Referring to Figure 1, I l is the inner conductor of a concentric high frequency cable surrounded by the supporting helices I2 of polystyrol and the polystyrol bonds i3. Thereon there is provided the outer conductor consisting of preshaped bands 6l and 65, which are provided with transverse grooves 63 at short distances from one another. The bands 6I and 63 are held together by a further copper band I6.

The bands are more clearly shown in Figs. 2 and 3 wherein the outer conductor 6| is provided with transverse grooves 63 and projecting parts S4. The projections 64 engage with the abutting tubular half 65 and prevent a lateral displacement between the two tube halves, while Y a relative longitudinal displacement is possible within the interval between the consecutive pron jections. An unlimited possibility of displacement in the longitudinal direction may be obtained by providing only one of the two abutting bands with projecting parts il, and by cutting out portions of the transverse grooves of the other band $5 at the points 66, so that the projections il of the opposite band 8| can slide past at these points, as will be seen from Fig. 3, in which only the transverse grooves of the upper tube half are provided with projections i4.

What we claimis:

1. A tubular electric high frequency conductor consisting of a plurality of metal bands stranded together and having indentations in the form of transverse grooves extending at right angles to the plane of the bands, said bands being Preeral displacement between adjacent bands.

2. A tubular electric high Ifrequency conductor consisting of a plurality of metal bands stranded together and having indentations y in the formo! transverse grooves extendingiat right angles to the plane of the bands, said bands being preshaped in such a manner that thebands have a circular crs-section when arranged with v the edges thereof adjacent each other, said indentations terminating in projections extending 10 beyond at least one edge of some oi the bands and said indentations having recesses at edges thereof adjacent said projections so that the band nally with respect to the band providedwith re- ULFILAS MEYER.

AIFRED BRAUN. FRANZ UNTERBUSCH. `AUGUST LINDLAU. CLENIENS KERN.

CBSSES.

`carrying the projections may move longitudi-

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