Electrical connectors – With vitreous-type envelope – Having bayonet-coupling contact
Reexamination Certificate
1998-10-15
2001-10-16
Nguyen, Khiem (Department: 2839)
Electrical connectors
With vitreous-type envelope
Having bayonet-coupling contact
C439S098000
Reexamination Certificate
active
06302740
ABSTRACT:
FIELD OF INVENTION
The present invention relates to a method of fabricating shielded cable assemblages, and to a cable and connector assemblage fabricated in accordance with the method. By cable and connector assemblage is meant an assemblage which includes one or more cable-connector assemblies.
RELATED PRIOR ART
The shielding effect provided by commercially available cable and connector assemblages, such as STP-cable and connector assemblages (Shielded Twisted Pair) and FTP-cable and connector assemblages (Foil-shielded Twisted Pair) has been found insufficient in the case of sensitive applications. Present day cable shielding is achieved, for instance, by folding back part of the braided metal shield and soldering it to a metal surface on the connector. Shielding effected in this manner has also been found insufficient.
SUMMARY OF THE INVENTION
The present inventions aims to solve these problems. This aim is achieved with a method of fabricating shielded cable and connector assemblages in accordance with claim
1
or claim
5
, and with cable and connector assemblages according to claim
6
or claim
10
. According to a first embodiment, the inventive method comprises the steps of folding part of the braided metal shield back over the outer mantle and then fitting a shielding element which embraces the whole of the junction area between the folded-back braided metal shield and the cable conductors and which is in electrical contact with said braided metal shield. A connector is then fitted to the cable. Each cable and connector assembly is then placed in a fixed position in a moulding device and a strain relieving element is moulded in the connector such as to fill-out the space between cable and connector and affix the same in relation to one another.
According to a first embodiment the cable and connector assemblage comprises a connector and at least one cable, which includes, among other things, conductors, a braided metal shield, and a cable mantle, wherein the cable and connector are fitted together to form a cable-connector assembly and a strain relieving element is moulded, inter alia, in the space between the cable and connector. The assemblage also includes a shielding element which fully embraces the junction between a part of the braided metal shield which has been folded back over the cable mantle and the conductors and which is in electrical contact with said braided metal shield.
According to a second embodiment, the inventive method of fabricating a shielded cable and connector assemblage comprises the steps of folding a part of the braided metal shield back over the outer mantle surface, fitting each cable with a cable connector to form a cable-connector assembly, fixating each cable and connector assembly in a moulding device and moulding a strain relieving element such as to fill-out the space between cable and connector and to affix the same in relation to one another.
According to a second embodiment of the inventive cable and connector assemblage, the assemblage comprises at least one cable, which includes conductors and a braided metal shield among other things, a connector fitted to the cable, and a strain relieving element moulded, inter alia, in the space between the cable and the connector. A part of the braided metal shield has been folded back over the outer mantle of the cable and the strain relieving element is moulded from an electrically conductive plastic material and covers the rearwardly folded braided metal shield.
The inventive methods and the inventive cable-connector assemblages provide assemblages that have splendid shielding properties and better performances than known cable-connector assemblages. This is achieved with simple and inexpensive fabrication/technical solutions. Another advantage afforded by the invention is that the cable-connector assemblages are not clamped or squeezed together during fabrication. Conventional clamping or squeezing of the conductors causes the conductors to be pressed together under pressure, resulting in deformation. This often results in cracking of the plastic ? (platsen) around the conductors.
REFERENCES:
patent: 2862993 (1958-12-01), Schmidt
patent: 3404454 (1968-10-01), Sayles
patent: 3621560 (1971-11-01), LeBright
patent: 4697339 (1987-10-01), Verhoeven
patent: 4795352 (1989-01-01), Capp
Interconnect AB
Nguyen Khiem
Paul & Paul
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