FI59893C - DRAGFAST ELEKTRISK FOERBINDNING MELLAN KOAXIALKABELAENDAR - Google Patents

Description

RSFH [B] {11) »tWW * PUBLICATION CQQQ'T

JgSTg) lJ '' UTLÄGGN INGSSKRIFT 0? O? 0 (45) Patent GoJJelat T ^ ^ (51) Kv.ik.Wci.3 H 01 H 9/05 FINLAND — FINLAND (21) FKMttihakvmg · - · PManumeknini 328/73 . (22) Hsk * mi * ptivl - Aiwökiringtd * f 05 * 02.73 '(23) AHwpUvt — GMti | h «ud« | 05 * 02 * 73 (41) Tullut (tilitItuksl - Blivtt offmltg 09 * 08 * 73

Htwttl * ji registry managed .... ............,. ,,,. _ Λ. . „(44) N lh t * vtk» l psnen J «kuL) utkal« un pvm. -

Pttanfroch registerstyrelten 1 'AmMcm uti ^ d och utUkriftM pubuc «r» i 30.06.8l (32) (33) (31) F) ry4 «ty privilege —Begird pciorhet 08.02 * 72

Holland-Holland (NL) 720l606 (71) N.V. Philips' Gloeileunpenfabrieken, Eindhoven, Holland-Holland (NL) (72) Hubertus Johannes Josephus Gommans, Venlo, Josephus Gerardus Henri -cus Stikkelbroeck, Venlo, Holland-Holland (NL) (7¾) Oy Kolster Ab (5¾) Tensile electrical connection between coaxial cable ends - Dragfast elektrisk förbindning mellan coaxialkabelandar

The invention relates to an electrical connection between two coaxial cable ends, each of which comprises a center conductor, a solid insulator surrounding the center conductor, a cylindrical outer conductor and a sheath, the center conductors and outer conductors being electrically connected to each other in a conventional manner, e.g. The invention further relates to a method for manufacturing such a joint. In particular, due to the increasing use of common antennas for television receivers, reliable connections between coaxial cable ends are required, whereby these cable ends may have the same or different diameters.

The most important requirement for such connections is that no reflections interfering with the reception of the signal transmitted via the cable must pass through the connection. In addition, the joint must be waterproof and must be capable of being subjected to traction without interference.

Known joints are complex and expensive and can easily cause errors. Only trained personnel can install them.

2 59893

In certain known connections, in the case of tensile stress, the electrical connection between the center conductors is stressed, which can cause electrical interference in the cable. Other joints have a sheath that is subject to tensile stress, which can damage it so that moisture can penetrate inside the cable.

The object of the invention is to provide a connection which, after receiving a few instructions, can be installed flawlessly and with few tools by untrained personnel and which can be subjected to tensile stress without electrical disturbances in the cable.

The connection between two coaxial cable ends, which solves the task according to the invention, is characterized in that the cable ends are mechanically connected to each other by connectors of electrically insulating material with at least two radial projections inside which adhere to the radial grooves in the e-crossings of both cable ends. between the radial grooves of the insulator and the cable end plus the strength of the connecting piece in this area, the diameter is the same or substantially the same as the original diameter of the cable insulation in this area.

The method of making such an electrical connection is characterized in that part of the sheath, part of the outer conductor and part of the cable insulation are removed from both cable ends so that the outer conductor protrudes part of the sheath, the cable so that the ring with the larger inner diameter is between the ring with the smaller inner diameter and the cable end, after which the middle conductors are connected to each other by means of a metal sleeve with a sheath of electrically insulating material, which sleeve is pushed over the ends with radial protrusions which engage in grooves formed by removing an o-ring of smaller inner diameter, thereby fitting a press around the joint usually by means of coating devices, metal shell halves which overlap on the protruding parts of the outer conductors and are in electrical contact with them, and whereby the entire connection point is sheathed.

The metal sleeve used in the method may be provided with one or more axial grooves and its diameter may be slightly smaller than the diameter of the center conductor, so as to obtain 3,5893 compression joints. The outer diameter of the insulating sheath of this cylindrical connector is preferably the same as the diameter of the delimiting parts of the cable insulation. If these diameters are different from each other, the diameter of each end is the same as the diameter of the limiting cable insulator. The diameter thus changes between the two ends, e.g. at regular intervals, so that a conical shape is obtained, in which case, of course, care must be taken to ensure that the impedance is the same everywhere as at the cable ends. This sheath may possibly form a whole with the shell halves. The electrical connection between the cylindrical conductors can be made, for example, by means of metal shell halves which overlap on parts of the conductors and are clamped to the conductors by means of a clamping device. For this purpose, for example, pin rings are used. These shell halves are preferably provided at least at the joints with interconnected profiled grooves to prevent outward radiation. The outer sheath can then be arranged, for example, so that the shrinkable tube or the self-vulcanizing sealing strip is pulled over the assembly.

The invention will now be described by way of an exemplary embodiment with reference to the drawing.

Figures 1-3 show axial sections of cable ends in different manufacturing steps to provide a joint according to the invention, Figure 4 shows an axial section of a joint according to the invention, Figure 5 shows a radial section of a cylindrical connector, Figure 6 shows a shell-like connector, axial section of the finished joint. Figure 1 shows the coaxial cable end in an axial section. The cable comprises a solid copper center conductor 1, a solid polyethylene insulator 2, a copper well and / or copper wire outer conductor 3 and a polyethylene outer sheath 4. A similar portion of the sheath 4 and the outer conductor 3 are removed from the cable end. 3 until. A part of the insulator 2 is then removed, so that after this operation the middle conductor partially protrudes from the insulator (Fig. 2). Two chips (G and 7) are now removed from the insulation.

If desired, this operation can be combined with the previous operation - exposure of a portion of the center conductor (Figure 3). The groove obtained by removing the chip 6 receives the part 9 59893 protruding on the inside of the shell half 8. Reducing the diameter of the insulation by removing the chip 7 serves to receive the thickness of the shell half 8 so that, as shown in Fig. Ä, the outer diameter is the same The jacket part 4A is then removed. The protruding portions of the center conductor 1 are inserted into a connecting piece 10, shown in radial section in Fig. 5. The connecting piece 10 comprises a metal sleeve 11 having a somewhat more biased diameter than the center conductor and may be provided with one or more axial grooves 12. Since by fitting the metal sleeve 11 the diameter of the conductor increases proportionally at this joint, it is generally necessary to adjust the insulation constant of the material of which the sheath 12 is composed if this material is the same material from which the closed insulation 2 is made, in which case it must be reduced. This can be influenced, for example, by fitting a plurality of channels 13 parallel to the axis in the jacket 12 (see Fig. 5).

The shell halves 8 are then fitted, whereby the protruding edges 9 go into the recesses formed when the chip 6 is removed. Figure 6 shows a longitudinal section of such a shell half 8. The shell half 8 may be made of the same electrically insulating material as the solid insulator 2, e.g. polyethylene. The two shell halves can together form a closed cylindrical shell. The shell halves may also be such that three or more shell halves form a closed cylindrical shell. In general, however, it is advantageous to limit the number of shell halves, while at the same time limiting the number of joints through which moisture could penetrate. Figure 7 shows a radial view of the two shell halves 8. In order to provide a satisfactory seal against moisture, the contact surfaces 1 * 4 may be provided with suitable ribs and grooves. As an additional measure to prevent the ingress of moisture, a water-repellent mass, e.g. polyethylene wax or silicone grease, can be placed between all parts. The two copper sheaths 15 and 16 are then drawn over the joint in overlapping electrical contact with the conductors 3 and fastened with pin rings 18. A tube of elastic electrical insulating material 17 is then drawn over the entire joint, e.g. a shrinkable polyethylene tube previously fitted over the other cable end . This tube 17 acts as an outer jacket. In order to obtain a good melt against the ingress of moisture, it is preferred that this tube 17 in part s 59893 is on the jacket 4, as shown in Fig. 8.

The connection described can be stressed without the risk of changing the electrical connection or local impedance between the cable ends. Such a joint can be wound on and unwound from a spool without the risk of damage. The use of cable glands is generally not necessary, with this structure according to the invention sufficient water resistance is achieved.

The joint according to the invention can be used, for example, to connect cable ends with an overall diameter of 15 mm or more to each other.

* ψ '

Claims (3)

6 59893 An electrical plant between two coaxial cable ends, each end comprising a center conductor (1), a solid insulator (2) surrounding the center conductor, a cylindrical outer conductor (3) and a sheath (4), the center conductors and outer conductors being connected to each other in a conventional manner, e.g. electrically, characterized in that the cable ends are mechanically connected to each other by connectors (10) of electrically insulating material with at least two radial protrusions (9) inside which engage in radial grooves in the insulators of both cable ends, whereby the radial grooves of the cable insulator (2) and between the end of the cable plus twice the strength of the connector (10) in this region, the diameter is the same or substantially the same as the original diameter of the cable insulator (2) in this region. Electrical plant between two coaxial cable ends according to claim 1, characterized in that the center conductors (1) protrude from the cable insulation of the cable ends and are electrically connected to each other by means of a metal sleeve (11) pushed over both ends and provided with a sheath of electrically insulating material (12). ) with the same or nearly the same diameter at each end as the diameter of the limiting cable insulation. A method of making an electrical connection between two coaxial cable ends according to claims 1 and 2, characterized in that part of the sheath (4), part of the conductor (3) and part of the cable insulation (2) are removed from both cable ends so that the outer conductor ( 3) protrude partly from the sheath (4), the cable insulation (2) from the outer conductor (3) and the middle conductor (1) partly from the cable insulation (2), while part of the exposed cable insulation is removed radially as two annular chips of different diameters (6, 7) , that the ring with the larger inner diameter (7) is between the ring (6) with the smaller inner diameter and the cable end, after which the middle conductors (1) are connected to each other by means of a metal sleeve (11) with a sheath (12) of electrically insulating material. over the ends, while fitting the connecting pieces from the shell halves (8) provided at both ends with radial protrusions (9) on the inner side. ), which adhere to the grooves formed by removing the o-ground ring (6) of smaller inner diameter, whereby the shell halves (15, 16) of metal are fitted around the joint by means of clamping devices, which 59893 8