Electricity: electrical systems and devices – Housing or mounting assemblies with diverse electrical... – For electronic systems and devices
Reexamination Certificate
2000-10-31
2002-08-27
Martin, David S. (Department: 2841)
Electricity: electrical systems and devices
Housing or mounting assemblies with diverse electrical...
For electronic systems and devices
C361S720000, C361S797000, C361S694000, C211S041170, C211S073000, C211S135000, C312S350000, C206S706000, C206S707000
Reexamination Certificate
active
06442035
ABSTRACT:
BACKGROUND OF THE INVENTION
This application relates to the art of card cages and, more particularly, to card cages for supporting a plurality of side-by-side vertical circuit cards. The invention is particularly applicable for use with telephone power distribution and switching circuits, and will be described with particular reference thereto. However, it will be appreciated that the improved card cage of the present application can be used for other purposes and for supporting other types of circuit cards.
Card cages for supporting circuit cards commonly are fabricated from a plurality of individual components. Plural components and large openings for ventilation may reduce the effectiveness of the card cage in satisfying electromagnetic compliance requirements.
It would be desirable to have an improved card cage that is easy to fabricate and that minimizes any leakage of electromagnetic emissions.
SUMMARY OF THE INVENTION
A one-piece metal card cage in accordance with the present application is fabricated from a single piece of sheet metal to have top and bottom walls, opposite sidewalls, a backwall and a front opening.
In a preferred arrangement, the sidewalls include upper and lower sidewall portions that respectively are integral with the top and bottom walls. The upper and lower sidewall portions are secured together along overlapping sidewall portions, at least one of which is laterally offset from the other.
A plurality of projection rows are formed in the top and bottom walls, and extend into the interior of the card cage to provide guide channels that receive top and bottom edge portions of circuit cards. The projection rows extend in a direction between the sidewalls and are spaced from one another in a direction between the front opening and the backwall.
Each projection row is formed by a plurality of individual hollow projections that are spaced from one another in a direction between the sidewalls to define guide channels therebetween for receiving upper and lower edge portions of circuit cards. The hollow projections provide flow of ventilation air in and out of the card cage.
The projection rows include a pair of front projection rows that are located closely adjacent to the front opening. The pair of front projection rows are positioned closer to one another than the remainder of the projection rows so that the guide channels are very close together and prevent skewing of a circuit card as it is inserted into the card cage.
The hollow projections preferably are generally cylindrical although other shapes may be used.
It is a principal object of the invention to provide an improved card cage.
It is also an object of the invention to provide an improved card cage that reduces electromagnetic emissions while providing good stiffness and ventilation air flow.
It is a further object of the invention to provide a one-piece metal card cage that minimizes the number and size of card guide slots and open areas so that leakage of electromagnetic emissions is minimized.
REFERENCES:
patent: 3664510 (1972-05-01), Kerschbaum
patent: 3696936 (1972-10-01), Straccia
patent: 4519016 (1985-05-01), Bradley
patent: 5219443 (1993-06-01), Stoerk
patent: 5256086 (1993-10-01), Ponn
patent: 5696668 (1997-12-01), Zenitani
Atchison Charles W.
Perry Joseph C.
Jones Day Reavis & Pogue
Lindinger Michael L.
Marconi Communications Inc.
Martin David S.
LandOfFree
Card cage with Integral card guides does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Card cage with Integral card guides, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Card cage with Integral card guides will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2967971