Electrical plug connection

Details Electrical plug connection Electrical plug connection

1997-03-24

1999-05-25

Paumen, Gary

Electrical connectors

Metallic connector or contact having movable or resilient...

Spring actuated or resilient securing part

H01R 1333

Patent

active

059065206

DESCRIPTION:

BRIEF SUMMARY
FIELD AND BACKGROUND OF THE INVENTION

The invention relates to an electrical plug connection with a plug receiver and a plug pin, especially a plug pin of round cross-section, the plug receiver having a receiving chamber and an axially compressible coil spring having individual turns being disposed in the receiving chamber.
An electrical plug connection of this kind is known in the form that a contact piece axially displaceable in the receiving chamber is provided ahead of the coil spring in the direction of insertion, the plug pin entering into end face electrical contact with the contact piece on an insertion operation. It is further known to provide a tubular plug receiver, onto which, on an outer surface, a coil spring is pushed on, one turn of the coil spring penetrating secant-like into the interior of the plug receiver through an opening in the plug receiver. On an insertion operation, the plug pin is pressed against an inner surface of the plug receiver by the turn which extends secant-like, so that in this manner the desired electrical contact comes about.
Each of these known plug connections is unsatisfactory in different respects. In regard to the axially displaceable contact piece, an electrical contact between the contact piece and the plug pin is achieved only on a comparatively very small surface. There results, on account of the small, point-form contacting surface, relatively high wear on the contacting surfaces, because flashover and contact-breaking sparks form precisely in the region of these surfaces. In the version with the spring turn extending secant-like, relatively high friction is produced between the plug pin and the inner surface of the plug receiver. The wear is especially great in this case when insertion and withdrawal takes place under electrical load. The mechanical wear is greatly promoted by the formation of contact-breaking and flashover sparks in the contact region.
Having regard to the above-described state of the art, it is seen as a technical problem for the invention to provide an electrical plug connection in which, on the one hand, there occurs the least possible wear even with frequent insertion cycles, while on the other hand, the plugging force does not become too high, all this with good and reliable electrical contact.


SUMMARY OF THE INVENTION

This technical problem is solved initially and basically by the invention in that the main diameter of the turns is greater than an outside diameter of the plug pin and that one or a few of the contact turns have a smaller contact diameter than the main diameter, which smaller contact diameter is also less than the outside diameter of the plug pin. According to the invention, an electrical plug connection is obtained directly by insertion of the plug pin into the coil spring. A reliable and reproducible contact is moreover obtained in this way in that there is provided a programmed tight location within the extent of the coil spring, by means of a tightly laid turn. On account of the specified geometrical conditions, the plug pin, on an insertion operation, slides reliably into this tighter turn, namely the contact turn, by virtue of which the electrical contact is provided reproducibly, in each case at this location.
Preferably, it is also provided that as a result of an interaction between such a contact turn and a front region of the plug pin, the further turns of the coil spring in a front region of the coil spring come into a contacting engagement against the pin. This arises, for example, when the front end of the plug pin is formed to taper conically or in the form of a dome. By the interaction with the contact turn, there is produced the effect that the coil spring tries to bend outwards. This results, furthermore, in the turns of the coil spring which are situated ahead of the contact turn in the direction of insertion engaging on one side against the plug. As a result, there is obtained, at a multiplicity of locations, a reliable electrical contact between the plug pin and the coil spring. An electrical p

REFERENCES:
patent: 3074046 (1963-01-01), Sullivan
patent: 4192567 (1980-03-01), Gomolka
patent: 4620763 (1986-11-01), Mochida
patent: 4632496 (1986-12-01), Williams

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