Electricity: conductors and insulators – Boxes and housings
Reexamination Certificate
1999-07-21
2001-05-01
Dinkins, Anthony (Department: 2831)
Electricity: conductors and insulators
Boxes and housings
C439S456000
Reexamination Certificate
active
06225557
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a connector casing for coaxial cables.
It is known that coaxial cables comprise a central conductor surrounded by an insulating material covered with a tubular screen which is itself coated with insulation.
In a known manner, certain connector casings for coaxial cables are moulded from a plastic and comprise a connection face in which a connection block for the said coaxial cables is located and an exit face for these cables, which is perpendicular to the said connection face, so that the cables describe a curved path between the connection block and the exit face for the cables.
The technical problem usually encountered with this type of application specific to connectors for coaxial cables relates to maintaining the characteristic impedance of the cable over the entire length of its path through the casing as far as the connection to the coaxial contacts of the connector. This problem arises because, when the cable is deformed in an uncontrolled manner inside the casing, its impedance inevitably varies.
SUMMARY OF THE INVENTION
The object of the present invention is to create a connection casing allowing the cables to describe a controlled curved path inside the casing, thus avoiding any variation in their impedance.
According to the invention, this connector casing is characterized in that it contains a cable guide for each cable, the said cable guide being moulded into the casing and extending with a predetermined radius of curvature in order to avoid any variation in the impedance of the cable.
By virtue of such a cable guide, once the cable is put into position, the impedance of the cable can be precisely maintained as soon as the cable has been fitted and thereafter, whatever the stresses imposed on the cable which remains immobilized in this predetermined position.
In a preferred version of the invention, each cable guide consists of two parallel ribs extending in a circular arc having the said radius of curvature, the distance between the two ribs being approximately equal to the diameter of the cable extending between the two ribs.
The two ribs immobilize the cable without any play, so that there is no risk of the cable impedance varying according to the stresses to which it may be subjected.
Preferably, the connector casing comprises, close to the exit face for the cables, means for locking these cables relative to the casing.
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Fonteneau Michel
Lenoir Michel
Pesson Michel
Dinkins Anthony
Framatome Connectors International
Nino Adolfo
Perman & Green LLP
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