Electrical connectors – With circuit conductors and safety grounding provision
Patent
1995-10-18
1997-12-16
Paumen, Gary F.
Electrical connectors
With circuit conductors and safety grounding provision
439939, 411 60, 411342, H01R 466
Patent
active
056977972
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION AND PRIOR ART
The present invention relates to a device for grounded securing of an element at a hole in a metal plate.
Thus, to ground means here that the element in question is brought into electrical connection with the metal of the plate, in which the hole is made. The invention relates to such grounded securing of all types of elements, for which there is a desire to obtain such a securing, but the case of an antenna securing element intended to be secured in the hole in the body sheet of a car for a radio antenna, in particular for a car telephone, will by way of example be discussed hereinafter.
For the good function of such an antenna, and also other elements of a similar type, the resistance to ground, i.e. in this case the car sheet, of the antenna securing point has to be very low. Such a grounded securing of an antenna to the car sheet has until now been carried out by either exposing the metal plate or sheet on the inside of the car, i.e. most frequently on the underside of the car ceiling, around said hole, so that the securing member located inside the car may enter into electrical contact generating abutment upon the metal plate and establish an electrical connection therebetween and the antenna securing element, or the car enamel may be removed from the surfaces surrounding the hole and located on the outer side of the metal plate, so that the securing member externally located may come into an electric contact generating abutment upon these surfaces and thereby achieve an electrical connection between the metal plate and said element. The mechanic has in the former case great difficulties, since he has to assume a very uncomfortable working position and often has to stretch his arm about one meter and at the same time handle a tool to be rotated and pulled upwardly. It may thereby easily happen that the result, i.e. the grounding, becomes imperfect. In the latter case it is, besides requirements of accuracy and patience during the mounting, a great risk for damaging or in any case influencing the surrounding enamel, so that moisture later on penetrates thereunder and "roses" are created around the antenna location followed by corrosion on the metal plate thereunder.
BRIEF DESCRIPTION OF THE INVENTION
The object of the present invention is to provide a device of the type mentioned in the introduction, which enables grounded securing of an element at a hole in a metal plate, especially but not exclusively an antenna securing element at a hole in a car body sheet or plate, which finds a remedy to the inconveniences mentioned above of already known devices of this kind.
Thanks to the fact that said means are adapted to enter into radial abutment on the circumferential wall of the hole while establishing said electrical connection, it is not necessary to expose the metal of the plate neither on the inner side nor on the outer side thereof before securing the element, and no other exposure of any portions of the metal plate are either required, since the metal surfaces of the plate already exposed by producing the hole are used for obtaining the grounding aimed at. This means a greater simplicity as well as an improved result of the mounting with respect to devices already known. When securing the element to the plate it is only necessary to displace said means into a good radial contact with the circumferential wall of the hole and move the securing members towards each other into the securing position for completing the mounting in a satisfying manner. With respect to the case discussed above of mounting an antenna for a car telephone, the mounting gets much simplier, the risks for sheet damages caused by the mounting, for instance through corrosion, are eliminated and a very good electrical connection between the antenna securing element and the metal of the plate may be obtained with a high reliability.
According to a preferred embodiment of the invention said means comprise portions arranged to be displaced radially inside said hole into abutment upon the circumf
Paumen Gary F.
RTB AB
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