Electrical connectors – Electromagnetic or electrostatic shield – Multi-part shield body
Patent
1995-04-27
1996-04-30
Nguyen, Khiem
Electrical connectors
Electromagnetic or electrostatic shield
Multi-part shield body
439108, H01R 13648
Patent
active
055119921
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a device for holding a shielded cable plug on a plug connector of backplane wiring of a mounting rack, which device is provided with shielding metal sheets.
A device of this type has been disclosed, for example, by the documents of German Utility Model 92 05 780. According to this document, the shielding metal sheets are arranged along the side walls of a plug housing and are provided with spring tongues which make contact with a shielding housing enclosing the cable plug. The spring metal sheets are extended beyond the contact-making region in the insertion direction and form guiding sections on which the cable plug is precentered during insertion onto a plug connector. The guiding sections are connected to the contact-making region via displaceable connecting webs.
Furthermore, the documents of German Utility Model 92 07 674 disclose protruding latching lugs being bent out on the shielding housing, said lugs projecting into corresponding perforations in the connecting webs, with the result that the cable plug is secured against being pulled out unintentionally. Since the relatively long cable plug is held in a manner such that it can tilt to the side within certain limits, the perforations are considerably wider than the latching lugs, in order that a secure latching is obtained.
In the case of cable plugs of this type, lateral forces can act on the plug during work on neighboring connecting cables, which forcus are able to change the angular position of the plug and hence to impair both the contact security at the plug contacts and the shield security.
SUMMARY OF THE INVENTION
The invention is based on the object of fixing the plug on the shielded plug connector in such a way that its angular position can be changed only minimally.
This object is achieved by virtue of an improvement in a device for holding a shield cable plug on a plug connector of backplane wiring of a mounting rack, which device includes shielding metal sheets which, along side walls of a plug housing of the plug connector, have spring tongues which can make contact with a shielding housing enclosing the cable plug, and the spring metal sheets extend beyond the contract-making region to form a guiding section which bears against the shielding housing of the cable plug. The improvement comprises guiding slots, which are open toward the outside and extend in the insertion direction and are cut into the guiding sections, the shielding housing of the cable plug has protruding guiding webs which engage with little play into the guiding slots, and the shielding housing is provided with the hook-like projections which engage around the shielding walls. In this case, the guiding webs engage in the corresponding slots without any play, whereby the plug can no longer be moved in the direction parallel to the side walls. The hook-like projections which engage behind the shielding metal sheets prevent the possibility of the shielding housing being moved away from the shielding walls in the event of a force which acts transversely with respect to the shielding walls. In this case, the guiding forces of the two shielding metal sheets on both sides of the plug connector are added. These measures mean that the latched-on cable plug is held on the shielded plug connector in a virtually rigid manner, with the result that the contact security is not impaired, even in the case of unintentional pulling on the plug cable. The robust retention additionally prevents the shielding housing from being lifted off the shielding metal sheet to such an extent that the latching lugs come out of the perforations.
The preferred embodiment has the hook-like projections formed or fitted directly on the guiding web to form hook-like guiding lugs with the distance or spacing between the hook-like projection and the shielding housing being approximately equal to the thickness of the shielding metal sheets. This structure means that only a single compact structural element is needed for both-coordinate directions and
REFERENCES:
patent: 4370515 (1983-01-01), Donaldson
patent: 5307242 (1994-04-01), Seibold et al.
Nguyen Khiem
Siemens Aktiengesellschaft
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