Electricity: conductors and insulators – Conduits – cables or conductors – Combined
Patent
1997-09-11
1999-06-29
Kincaid, Kristine
Electricity: conductors and insulators
Conduits, cables or conductors
Combined
174 89, H02G 1508
Patent
active
059171537
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a sealing cable penetration for shielded cables, having a threaded stub which is to be inserted into a housing wall bore, a locking nut which is to be tightened onto a thread of the threaded stub which is on the outside of the housing wall, and an annular clamping disk which can be axially displaced in the interior of the threaded stub and is forced, by a pinch seal which is to be pressed on by the locking nut, against a radially inwardly projecting annular shoulder on the threaded stub.
RF-proof, that is to say EMC-capable, cable penetrations, to be sealed by screwing, for shielded cables are known in which after removal of an outer cable sheath a shielding braid is exposed which surrounds the cable and is to be connected electrically to the housing of the cable penetration and/or to the inner wall of the housing and to a frame or the like. It is possible to achieve a desired contact of the shield which conducts well and is RF-proof by using an annular clamping disk which is seated over the shield and is pressed, for example via an annular pinch seal made from rubber material, by screwing it onto a threaded stub penetrating the housing wall by tightening a locking nut. In this type of RF-proof fixing, fraying of the shielding braid occurs virtually regularly. This is because in the case of frequently following mounting steps, for example in the case of further plug mounting, the cable with the exposed shielding braid must be moved to and from at least once for operational reasons inside the cable threaded union. It can easily happen in this process that wire end pieces of the shielding braid break off and can cause electrical interference inside the device housing.
BRIEF DESCRIPTION OF THE INVENTION
It is therefore the object of the invention to construct a sealing cable penetration for shielded cables with a cable threaded union in such a way that, on the one hand, mounting is substantially simplified and mounting time is saved and, on the other hand, the nobility of the cable in both axial directions, for example during subsequent cable manufacture, is maintained.
In a sealing cable penetration for shielded cables of the generic type described at the beginning, this object is achieved according to the invention by a shielding sleeve which is to be inserted between the cable shield and the cable strand(s) and has at least one radially projecting shoulder at the front of the inner end of the cable shield, a stamping sleeve which is to be pushed over the shielding sleeve on the outside of the cable shield, and is shaped by being pressed onto the shielding braid, for example by means of crimping pliers, and by at least one continuous axial recess, adapted to the at least one radial shoulder of the shielding sleeve, in the annular shoulder of the threaded stub.
The radially projecting shoulder of the shielding sleeve can preferably be constructed in pairs in the form of diametrically opposite rounded lugs, for which purpose reference is made to the exemplary embodiment described further below.
It is possible to provide on the inside of the annular shoulder, for example offset by 90.degree. with respect to the continuous axial recess, a sunken recess which is adapted to the radial shoulder of the shielding sleeve and is intended to latch against rotation of, and improve the contact of the shielding sleeve fixed on the shielding braid of the cable by means of the stamping sleeve. The stamping sleeve advantageously is made of a soft material, for example of copper, by comparison with the material of the shielding sleeve, which material can be made for example, of brass.
Furthermore, it is advantageous for the purpose of improving the electric contact resistance inside the cable threaded union to produce the sealing pinch seal from an elastomer having embedded conductive material, for example having embedded conducting wires.
A cable penetration with a threaded union according to the invention permits adequate freedom of movement of a prefabricated cable b
REFERENCES:
patent: 3315024 (1967-04-01), Ball
patent: 3373243 (1968-03-01), Janowiak et al.
patent: 3622952 (1971-11-01), Hilbert
patent: 3710005 (1973-01-01), French
patent: 3883681 (1975-05-01), Campbell
patent: 4156554 (1979-05-01), Aujla
Feiereisen Henry M.
Jacob GmbH
Kincaid Kristine
Nguyen Chau N.
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