Electrical connectors – With circuit conductors and safety grounding provision
Patent
1997-11-17
1999-07-27
Bradley, Paula
Electrical connectors
With circuit conductors and safety grounding provision
174 92, 174 50, 174 35R, H01R 458
Patent
active
059280077
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a device for grounding feed or supply cables between transmitters or receivers and antennas or aerials, preferably between radio or television transmitters or radio or television receivers and radio or television aerials, whereby at least one aperture is provided in an outer sheath of the supply cable for exposing an inner conductor in said supply cable and whereby at least one connector is in contact with the exposed portion of the inner conductor for grounding said inner conductor through at least one ground wire cooperating with the connector.
Supply cables are grounded to prevent lightning strokes in the aerial from causing damages in the transmitter or receiver. If e.g. the aerial is mounted on a high mast, the supply cable is grounded in the mast at about every fiftieth meter and also in the ground at the base of the mast.
The devices for grounding the supply cable however, have some drawbacks. This result in that it takes an annoyingly long time to mount the devices, it is difficult to obtain a satisfactory sealing at the grounding point and the supply cable is weakened through the apertures therein.
The object of the present invention has primarily been to eliminate said drawbacks by means of a simple device. This is arrived at according to the invention by providing the abovementioned device substantially with the characterizing features of subsequent claim 1.
Since the device is provided with said characterizing features, grounding can occur by means of a few members, the mounting or assembly time is substantially reduced, a very good sealing is obtained around the aperture in the outer sheath and the weakened spot at said aperture in the outer sheath can be reinforced.
The invention will be further described below with reference to the accompanying drawings, wherein
FIG. 1 schematically illustrates an aerial mast with a supply cable between the aerial and a transmitter or receiver, which supply cable is grounded at some locations with devices according to the invention;
FIG. 2 with a side view illustrates a portion of the supply cable of FIG. 1 provided with a device according to the invention of which one half is shown with a side view and the other half with a longitudinal section;
FIG. 3 is a view III--III of the device of FIG. 2;
FIG. 4 is a section IV--IV through the device of FIG. 2;
FIG. 5 is a section V--V through the supply cable of FIG. 3 and an end view of the device of FIG. 3;
FIG. 6 is an enlarged section VI--VI through the device of FIG. 3;
FIG. 7 with a plan view illustrates the inner side of a bracket forming part of the device of FIG. 1; and
FIG. 8 is a section VIII--VIII through the bracket of FIG. 7.
In FIG. 1 a mast 1 having an aerial 2 and a feed or supply cable 3 mounted between said aerial 2 and a transmitter or receiver 4, is schematically illustrated. The aerial 2 can be a radio or television aerial and the transmitter or receiver 4 a radio or television transmitter or a radio or television receiver. In order to prevent damages on the transmitter or receiver 4 if the lightning strikes the aerial 2, the supply cable 3 is grounded at several locations, namely through grounding devices 5 which are schematically shown in FIG. 1. A number of such grounding devices ground or earth the supply cable 3 against the mast 1 and a grounding device 5 grounds the supply cable 3 preferably against the ground 6 at the base of the mast 1.
In order to locate the grounding devices 5 at certain parts 7 of the supply cable 3, two apertures 8, 9 are provided at each such part 7 in opposite portions of the outer sheath 10 of said supply cable 3. The apertures 8, 9 are made so that an inner conductor 11 provided in the supply cable 3 is partly exposed (portion 12). The inner conductor 11 has in the illustrated embodiment a circular cross-sectional form, it is corrugated in longitudinal section and it consists of conductive metallic material, preferably copper material.
The apertures 8, 9 can be made by a suitable appliance, e.g. by means of a punch pliers (not sh
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Bradley Paula
Brown Cecelia Wright
Teracom Components AB
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