Патент USA US2116267код для вставки
May 3, 1938. F_ KUMMER . CONDUCTOR WITH AIR SPACE INSULATION Filed Nov. 15, 1935 17 19 2,116,267 2,116,267 Patented May 3, 1938 UNiTED STATES, PATENT OFFICE - 2,116,267 CONDUCTOR WITH AIR, SPACE INSULATION Franz Klimmer,v Bérlin-Oberschoneweide, Ger many, assignor to Felten & Guilleaume Carls werk Actien-Gesellschaft, Colome-Mulheim, Germany Application November 15, 1935, Serial, No. 50,034 In Germany November 15, 1934 5 Claims.» (01. 173-265) For the transmission oi‘ high frequencies use is made of coaxial conductors which, for the purpose of obtaining as small a capacity as possible be tween the conductors, are provided with an air space insulation. The capacity is reduced in proportion with the amount of insulating material employed and in proportion with the. dielectric constant ofv'the in sulating material. Naturally, the economy in in 'If it is desired further to ensure that the helix will not be displaced on the conductor, after the helix has been provided thereon itmay be secured by means of a thread provided thereon and laid in 10 sulating material must not be carried so far that the mechanical strength is thereby affected. In order to avoid large losses the angle of loss of the insulating material must be small. insertion consisting .of a thin thread capable of resisting tensional stress. This insertion has the further advantage that in the case of breakage the helix does not. unwind‘itself but=remains in its predetermined position on the conductor. , The object of the invention is to construct such 15 a cable in such a manner that whilst the capacity is as small as possible the required mechanical strength is ensured to a high degree. According to the invention, the conductors are _ separated from one another by a holder consisting 20 of a helix or helices which is or are self-sustain ing, being made of an insulating material capable oi retaining the helical shape, the said helix or helices being "hollow and open”. The latter ex pression is tobe understood as defining a helix the 25 interior ‘or which is not ?lled by another material and the turns of which do not touch each other .but leave an air gap between them. , an opposite'direction. This thread also assists in 10 holding the helix on‘the conductor. ' Various forms of carrying the invention into e?ect are illustrated, by way of example, in the accompanying drawing. ‘ Figure 1 illustrates in elevation and Figure 1a ll in cross-section a cable with a concentric arrange ment of the conductors and-having a number or helices parallel to the axis. ‘Figure 2 illustrates in cross-section a cable with a plurality of conductors ‘and- a plurality oi’ helices 20 . Figure 3 illustrates a cable with concentric ar rangement of conductors and a distance holder in the form of a helix which is helically arranged. Figure 4 ‘illustrates a helically arranged helix having inserted therein a thread‘canable of re 25 sisting tensional stresses. . ' Figure 5 illustrates an arrangement in which the hellxis secured on the conductor by means The said hollow and open helices may be either 1 of a thread capable of resisting tensional stresses. parallel to the axis of the conductor or in their Referring to Figures 1 and la, l is the inner ‘0 turn surround the inner conductor in helical lines. conductor, 3 the outer conductor and 2 are heli In this way the advantage is attained that a cal threads of insulating material provided ‘be very small amount of insulating material is em the said two conductors, The axes of the. ployed to secure a large air-space insulation, tween helices run parallel to the axis of the conductor. whilst at the same time great mechanical . Figure 2 shows in cross-section an arrangement 35 strength is attained. Moreover,» a cable con ‘having a number of coaxial conductors. The structed in this manner isvery ?exible and the middle conducting layers 5 and 6 are separated helices are stressed only with respect to torsion. from the inner conducting layer 4 and the outer A iurther advantage of the construction ac conducting layer '1, as well as from one another w cording to the present invention consists in the by hollow and open helices of insulating mate easy manner of manufacture of such cables. The 8. individual elements of the cable may be simply rial In the‘construction illustrated in Figure 3 the bundled together and surrounded by the outer hollow and open helix I0 is in its turn so ar cover it their axes are to run parallel or they may ranged as to-run helically around a conductor 9, ‘5 be stranded together in a known manner and then 'being surrounded by the coaxial conductor i I. be surrounded by the outer cover. ' Figure 4 illustrates a conductor in which the Polystyrol has been found a suitable insulating helix acting as a distance member is providedwith material since it has a small dielectric constant, a a thread capable of resisting tensional stresses. small angle of loss, great mechanical strength, . 3 more particularly with respect to torsion, and can easily be shaped. In order that the distance between two succes , sive turns of the helix shall remain the same at all points during the manufacture of the cable, was» may be made of a helix which contains an 9 80 35 ~ 40 45 i2 is the storage reel of the helix it which is pro vided with the said tension resisting thread it, 50 the conductor [5 being wound with the said helix from the storage reel l2. ' Figure 5 illustrates a cable in which the con ductor' I. is surrounded by an insulating hollow and open helix I‘! provided with a tension resist 2 2,116,267 ing thread It, which is held on the conductor by means of a thread I9. ' A winding 20, which may helically arranged between the said "two con ductors.' consist of‘?exible bands of polystyrol, is provided thereon. The outer conductor 2|, consisting of 3. In air space insulated high frequency con-' ductors comprising an inner conductor and an an individual number of copper bands, may be outer surrounding conductor, a distance holder 5 between the said two conductors consisting of a against induction 22, consisting of magnetizable 7 self-sustaining hollow and open helix of an insu further‘ provided with a protecting covering material. , Thematerial of the threads I! and I9 'must be 1. such as to be capable of resisting tensional stresses; preferably, use is made for this purpose of insulated material having fa small dielectric loss, such as for instance polysty_ 01. The threads ll used should be as thin as possible in order to re duce the proportion of the air in the conductor insulation as much as possible, What I claim is: 1. In air space insulated high frequency con ductors comprising an inner conductor and an 7 outer surrounding conductor, a distance holder between the said two conductors consisting of a self~sustaining hollow and open helix of an insu lating material capable of retaining the helical shape the said two conductors lying outside the said helix.‘ “ 2. In air space insulated high frequency con ductors comprising an inner conductor and an outer surrounding conductor, a distance holder between the said two conductors consisting of a self-sustaining hollow and open helix of an insu-. lating material capable of retaining the helical shape, which self-sustaining helix is in its turn lating material capable of retaining the helical shape the said two conductors lying outside the said helix and a thin thread capable of resisting 10 tensional stresses lying in the said self-sustaining helix for the purpose of taking up the tension to getherwith the self-sustaining helix. 4. In air space insulated high frequency con ductors comprising an inner conductor and an 16 outer surrounding conductor, a distance holder between the said two conductors consisting of a self-sustaining hollow and open helix of an in sulating material capableof retaining the helical shape the said two conductors lying outside the 20 said helix and a thread laid on the inner con ductor in opposite direction to the said helix for holding the latter in position on the inner con ductor. ‘ 5. In air space insulated high frequency con 25 ductors comprising an inner conductor and an outer surrounding conductor, a distance holder between the said two conductors consisting of a self-sustaining hollow and open helix of polysty rol which is capable of retaining the helical shape 30 the said two conductors lying outside the said helix. FRANZ KLIMMER.