DE1909342U - COAXIAL CABLE. - Google Patents

Description

THE PURUKAWA ELEKTRIC COMP. LTD.

No. l4, 2-Chome, Marunouchi, Chiyoda-Ku,

Tokyo / JAPAN

Dec 16, 1964

Coaxial

The innovation concerns the improvement of a coaxial lever.

Coaxial levers generally point between the inner and " the outer conductor on an electrical insulator, which the inner conductor in a central position to the outer conductor and has such a high mechanical strength that it does not deform or damage when the entire cable is bent can be made of a material with such a small dielectric or insulation constant it must be that an insulation capacity that is approximately equivalent to the air insulation is achieved, with the one used The amount of insulation material should be as low as possible.

For this purpose, up to now, disk-shaped insulators have mostly been attached to the inner conductor at intervals or it has been

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de a rope-like insulator with a circular cross-section spiral-shaped wound around the inner conductor.

In order to achieve an even distribution of the insulator in the longitudinal direction and to reduce the amount of insulation material used, an insulator with a rectangular cross-section wound in a spiral around the inner conductor has also been used or has been used narrow insulation tapes arranged in spiral turns in a plurality of layers one above the other. However, if isolators with a right-angled cross-section are wound around the inner conductor in a spiral shape, it becomes that of the inner conductor the facing part is pressed together and the part facing the outer conductor is subjected to a rotation, causing the winding is extremely laborious and difficult, which increases with the increase in the size and strength of the cable.

Are narrow and very thin insulation tapes only several mm wide in large numbers or in several hundred layers wrapped one on top of the other, so occur as a result of the slightest changes Depending on the thickness and width of the insulation tape, there are slight irregularities in the windings. The swaddling The superimposed insulation tapes require the utmost care and skill, despite observing the same the required mechanical resistance cannot always be guaranteed and the production is costly and is uneconomical.

The purpose of the innovation is to create an improved coaxial cable that can be produced easily and with economic advantages.

adjustable and resistant to stresses when bending the cable is.

This is achieved by using ribbons of plastic material with a right-angled cross-section in the case of a coaxial cable are used, the projections extending in the longitudinal direction on their surfaces coming into contact with one another, and in addition have matching grooves or recesses that interlock when the tapes are stacked when the stacked layers of tape are laid in open spirals around the inner conductor of the coaxial cable which the outer conductor is then applied directly or with the interposition of a retaining strip.

In the drawing are some embodiments of the subject of the innovation shown schematically. It shows: FIG. 1 an embodiment of the coaxial cable according to the invention in side view, partly in longitudinal section, Fig. 2 parts of the individual superimposed band-shaped Insulators made of plastic material, in perspective view

bi "6 ^verscn i ^e d ^ene further embodiments of the coaxial cable in a side view, partly in longitudinal section.

In Fig. 1 is a preferred embodiment of the innovation according to Coaxial cable shown, in which the plastic tape 1 with a right-angled cross-section over its entire length the surface facing the adjacent tape has a projection 2, while the adjacent tape is opposite

the projection 2 has a longitudinal groove J into which the projection 2 fits into it, like a tongue and groove.

A required number of such plastic tapes 1 are arranged one above the other, the projections 2 of the a band 1 in matching recesses 3 of the adjacent band intervention. The tapes joined together in greater numbers with a thickness of 1 to 5 mm and a width of about 5 to 10 mm depending on the thickness of the cable, have rectangular ones Cross-section and are wound in open spiral turns around the inner conductor 4 and form a composite of the strips 1 Insulator 5 * which is sheathed by an outer conductor 6 whose inner surface touches the outer surface of the insulator 5 directly.

The plastic strips 1 can each have the projection on one side and the longitudinal groove on the other side, so that they can each be placed on top of one another in the required number and interlocking the insulating body 5 form. There can also be plastic bands with a protrusion on each side alternating with bands with a recess each side to be engaged.

Preferably, the plastic tapes made of polyethylene with less süfc dielectric constant manufactured, whereby expediently the entire insulator 5 or the outer layers for the purpose of increasing the mechanical strength after being stacked are welded together by heating.

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In order to improve the heat resistance of the assembled insulator 5, at least the outer layers thereof are used preferably made of chemically or radioactively bound polyethylene, since then, if the outer conductor 6 is made of aluminum produced by injection molding and applied or applied in the extrusion process, no difficulties by melting the insulating body 5 result.

For the outer conductor 6 copper or aluminum tubes are mostly used, with corrugated cables with a large diameter Pipes are used to increase the flexibility of the cables.

3 to 6 are further modified embodiments of the renewal according to the coaxial cable shown. Fig. 3 illustrates the arrangement of a double spiral of which each of several composite plastic bands l each with a projection 2 on one side and a recess 3 on the other hand, which can be seen in FIG. 1 Way are wound symmetrically around the inner conductor 4. This has the advantage that the inner conductor when the cable is bent, it is supported by the composite insulator 5 in any cable position and is not deformed can be. When using three SpiralsssMxäsK joined together Insulators 5, of course, the above advantage is further increased.

FIG. 4 shows an embodiment similar to that in FIG. 1 shown arrangement, but with an additional Hal-

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telage 7 comprises the composite insulators 5 to a Displacement or deformation in the longitudinal direction of the isolator 5 to prevent. If the outer conductor 6 is applied to the outer layer of the isolator 5 in an extrusion process, the result is Another advantage is that the outer conductor does not easily penetrate into the gaps between the spiral turns can.

Fig. 5 illustrates another modified embodiment of the inventive composite isolator, wherein the plastic band 8 lying on the outer circumference of the insulator 5 is wider than the other bands 1. The interface between the outer edge of the insulator 5 and the outer conductor 6 or the holding layer 7 made of plastic material is enlarged as a result, as is the application of the outer conductor 6 or the holding position 7 facilitated and the further advantage achieved that the insulator 5 has a larger has mechanical strength.

Fig. 6 illustrates a further modified embodiment of the layered composite insulator of the innovation according to the invention Coaxial cable, which forms the layer-wise composite insulator, in open spiral turns the inner conductor wound plastic tape 1 is designed wider in its layers closer to the inner conductor. One Such an arrangement, which is illustrated in the drawing, has the advantage that the mechanical strength of the layered structure Insulator 5 increases and the risk of flipping over

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or breakdown of the layered insulator 5 is significantly reduced both in the manufacture of the coaxial cable and in the bending of the finished cable.

The arrangement according to the innovation with extending over the entire length of the belt, interlocking with one another like a tongue and groove designed projections or recesses on the touching surfaces of the plastic, rectangular in cross section Tapes that connect like a tongue and groove and are in Wind several spiral turns around the inner conductor and thus create an insulator that is assembled in layers and encased by the outer conductor can form, in comparison with previously known arrangements with only a single strip of rectangular cross-section, which is layered in a spiral in many hundreds of thin layers on top of one another and arranged in a twisted manner, can be manufactured far more economically and easily. Because the individual tape layers of the insulator, which is assembled in layers are in engagement with each other by means of tongue and groove projections and grooves, and thereby the danger the folding or collapse of the cable during manufacture or when bending the already finished cable is significantly reduced, the cable according to the invention has the advantage that it has excellent mechanical strength and retains its electrical properties for a long time.

Claims (9)

-884 657 * 12/17/64 protection claims 1. Coaxial cable is wound in a spiral around the inner conductor Insulator between inner conductor and outer conductor and cavities between the windings characterized by that the spiral-shaped wound insulator between the inner conductor and outer conductor from a plurality of in cross section rectangular plastic bands that go through in Longitudinal projections on one band and matching longitudinal grooves on the adjacent band like a tongue and groove are interlocking and stacked together to form a single body. 2. Coaxial cable according to protection claim 1, characterized in that that as an insulator between the inner core and outer conductor several insulators composed of the tape layers in alternating Side by side arrangement on the inner conductor can be used. J5. Coaxial cable according to protection claim 1 or 2, characterized in that that the tape layer arranged on the outer circumference of the insulating body is wider than the other tape layers is. 4. Coaxial cable according to protection claim 1 or 2, characterized in that that the tape layers of the insulator after the inner line -2- ter are designed to become wider. 5. Coaxial cable according to one of the protection claims 1 to 4, thereby characterized in that the insulator on its outer circumference by a plastic material strip wound around it is held together. 6. Coaxial cable according to one of the preceding claims for protection, characterized in that the tape layers forming the insulator are at least partially welded to one another, 7. Coaxial cable according to one of the preceding claims for protection, characterized in that the plastic bands are made of polyethylene. 8. Coaxial cable according to one of the preceding claims for protection, thereby characterized in that the outer and inner band layers of the insulator are made of one against chemical or radioactive influences made of resistant polyethylene. 9. Coaxial cable according to protection claim 1, characterized in that that the outer conductor consists of corrugated aluminum tube.