US2438347A - Coaxial cable - Google Patents

Description

March 23, 1948. L. H. MORIN 2,438,347

COAXIAL CABLE Filed May 13, 1944 INVENTOR OU/.5 MOR/N Q ATroRNEY Patented Mar. 23, 1948 COAXIAL CABLE Louis H. Morin, Bronx, N. Y., asslgnor of one-half to Davis Marinsky. Bronx, N. Y.

Application May 13, 1944, Serial No. 535,406

' 4 Claims'. (Cl. 1'14-28) 'This invention relates to coaxial cable employing insulators arranged longitudinally or the' conductor in supporting the same within an outer conductor or jacket. More particularly. the invention relates to conductors of this kind having means arranged longitudinally of the cable and engaging the insulators to retain the insulators against shifting movement longitudinally of the conductor, upon which the insulators are arranged. The novel features of the invention will be best understood from the following description when taken together with theaccompanying drawings, in which certain embodiments of the invention are disclosed and in which the separate parts are designated by suitable reference characters 'in each of the views, and in which:

Fig. 1 is a sectional view diagrammatically showing a part of a cable made according to my invention.

Fig. 2 is a cross section through the cable as seen in Fig. 1.

Fig. 3 is a view similar to Fig. 1 showing another form of construction.

Fig, 4 is a cross section of the cable as shown in Fig.3; and

Figs. 5 and 6 are views similar to Flg.-1 showing other forms of construction.

In the construction of coaxial cable having insulators spaced longitudinally oi' the inner conductor, difculty has been experienced in maintaining the insulators in spaced relationship to each other, particularly when the conductors have relatively smooth outer surfaces, To overcome these difliculties, I have provided means in the form of a strand which may be defined aS a string, cord or rope composed of any suitable material commonly employed in the construction of string, twine or rope. By this I mean, strands including twisted paper or strands of other materials which, in some instances, may comprise plastic materials. Then plastic insulators are die cast or otherwise arranged at spaced intervals along the conductor and around said spacing strands establishing a binding or adhesion of the insulators on the spacing strands by adhesion contact or the plastic material with the material of the strand or by reason of the fact that the cast insulators enter the interstlces of the blade or other crevices arranged on the surface of the strand.

In Figs. 1 and 2 of the drawing, I0 represents the inner conductor, upon which is arranged, at

material such for example as polyethylene. In forming the cast insulator discs II on the conductor, they are also formed around two spacing strands I2 arranged on opposite sides or the conductor l0 and more or less flattened thereon, as diagrammatically illustrated in Fig. 2, parties1 ularly where the discs are arranged on the strands. In some instances, the spacing strands may be generally shaped to the cross sectional contour shown in Fig. 2 to fit upon the conductor. The strands I2 may be composed of the various materials heretofore named depending largely upon the use of the resulting cable and the manufacturing costs. For illustrative purposes, the strands have been indicated as paper, cotton, hemp or other cord or string-like strands. At I3 is shown the outer conductor or jacket arranged directly upon the insulators I I.

In Figs. 3 and 4 is shown a modification of the construction shown in Figs. 1 and 2 and, in these iigures, I4 represents the inner conductor,

I5 the spaced insulators. I6 the strands equivalent to the strands I2 and I1 the outer conductor or jacket. In this construction, the strands I6 are spaced from the conductor Il and thus serve to not only space the insulators, but also' will have a tendency to reinforce the insulators adjacent the periphery thereof and in this respect would produce a resulting cable having less ilexibllity than the cable shown in Fig. 1.

In Fig. 5 of the drawing is shown another modiiication of the construction shown in Fig. 1 wherein a single strand I8 is spirally wrapped around the inner conductor I 9 and engaged by the spaced insulators 20 cast on the conductor I9. At 2I is shown the outer conductor or jacket arranged upon the insulators. The structure of Fig. 5 will have a greater flexibility than the structure of Fig. 1 in that the spiral arrangement of the strand I8 will lend itself to greater iiexure in the conductor and thus in the resulting cable.

In Fig. 6 of the drawing is shown a still further modification and, here again, a strand 22 is spirally wound around an inner conductor 23, the spiral being more extended than with the spiral, as seen in Fig. 5 and cast on the conductor 23 and on the spacing strand 22 are substantially cup-shaped or thimble-shaped insulators 24, the cross-head or closed ends 25 of which only engage the conductor 23 and strand 22. In the diagrammatic illustration of Fig. 6,

- the insulators 24 are rather widely spaced on the spaced intervals, disc-like insulators Il preierably die cast thereon and composed or plastic conductor and this would only be 'desirable in conductors where a great amount of ilexibility is required. At 2,8 is shown an outer conductor or jacket arranged upon the insulators 25.

From the foregoing, it will be apparent that one or more spacing strands may be arranged longitudinally of a conductor and upon which the spaced die cast insulators are formed to maintain the insulators against movement longitudinally of the conductor. This is particularly desirable in the operation of first applying the insulators to the conductor and prior to mounting theouter conductor or jacket thereon and. at the same time, these spacing strands maintain the conductors in spaced relationship, particularly in the lexure oi' the cable when in use. While, for the most part, the invention has been applied to disc type insulators, as illustrated in Figs. 1-3 and 5 of the drawing, the same is applicable to insulators o f any form of construction and arrangement and Fig. 6 of the drawing is simply to illustrate one other form of insulator in addition to illustrating a strand having a different spiral arrangement on the conductor than that shown in Fig. 5.

Having fully described my invention, what I claim as new and desire to secure by Letters Patent is:

1. In coaxial cable comprising a conducting outer sheath, a conductor arranged within and extending longitudinally of said sheath, disclike insulators spaced longitudinally of the conductor for spacing the conductor from the sheath and cord means arranged on and along said conductor and firmly clamped thereto by said insulators to maintain the spaced relationship of the insulators one to the other on said conductor.

2. In coaxial cable comprising a conducting outer sheath, a conductor arranged within and extending longitudinally of said sheath, disc-like insulators spaced longitudinally of the conductor for spacing the conductor from the sheath and 40 4 nbre cord means arranged on and along said conductor and firmly clamped thereto by said insulators to maintain the spaced relationship of the insulators one to the other on said conductor.

8. In coaxial cable comprising a conducting outer sheath, a conductor arranged within and extending longitudinally of said sheath, cast disc insulators spaced longitudinally of the conductor for spacing the conductor from the sheath and cord means arranged on and along said conductor and rmly clamped thereto by said insulators during the casting thereof to maintain the spaced relationship of the insulators one to the other on said conductor.

4. In coaxial cable comprising a conducting outer sheath, a conductor arranged within and extending longitudinally of said sheath, cast disc insulators `spaced longitudinally of the conductor for spacing the conductor from the sheath and twisted bre cord means arranged on and along said conductor and rmly clamped Imei-eta by said insulators during the casting thereof to maintain the spaced relationship of the insulators one to the other on said conductor.

LOUIS H. MORIN.

REFERENCES CITED Th'e following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,204,737 Swallow June 18, 1940 2,226,928 Harvey Dec. 31, 1940 2,288,900 Gits July 7, 1942 FOREIGN PATENTS Number Country Date 659,346 Germany May 2, 1938

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