Tongue and groove gasket seam for EMI

Details Tongue and groove gasket seam for EMI Tongue and groove gasket seam for EMI

2001-06-20

2003-05-27

Schuberg, Darren (Department: 2835)

Electricity: electrical systems and devices

Housing or mounting assemblies with diverse electrical...

For electronic systems and devices

C361S727000, C439S710000

Reexamination Certificate

active

06570755

ABSTRACT:

BACKGROUND
The disclosures herein relate generally to a computer system and more particularly to an EMI seal for a computer system chassis.
Increasing processor speeds are requiring improved electromagnetic interference (EMI) containment by a metal enclosure. The inability of individual metal fingers to be manufactured on a spacing that would be effective at the higher frequencies requires a continuous gasket.
Prior methods used to contain emissions include metal fingers made of various materials. The metal fingers can only be produced at large incremental spacing preventing the enclosure from providing a continuous EMI seal. Other methods are to use a tongue and groove concept to provide a labyrinth wave-guide to contain the emissions. The issue with these types of seals is intermittent contact at the seams. This creates larger problems than having no contact at all.
An EMI gasket has been used in various applications over the past few years. The gasket is typically applied using an adhesive. Adhesive adds cost and does not protect the gasket from abuse. The gasket adhesive is typically non-conductive which negatively affects the total surface area for gasket to metal chassis contact. Other applications require multiple parts to protect the gasket from customer abuse.
Therefore, what is needed is a chassis which limits the number of parts, creates a seal using a gasket and limits exposure to sharp edges.
SUMMARY
One embodiment, accordingly, provides a chassis seal which includes a gasket that does not require an adhesive. To this end, a computer chassis includes a metal chassis base portion and a metal chassis top portion. A pivotal connection is provided between the top portion and the base portion for movement of the top portion between an open position and a closed position with the base portion. A tongue and groove edge connection extends between the top portion and the base portion. An adhesive free gasket is mounted in the groove for sealing engagement with the tongue.
A principal advantage of this embodiment is that the gasket seal enhances EMI containment within the metal chassis.


REFERENCES:
patent: 5337464 (1994-08-01), Steffes
patent: 5347430 (1994-09-01), Curlee et al.
patent: 5438476 (1995-08-01), Steffes
patent: 5661640 (1997-08-01), Mills et al.
patent: 5761034 (1998-06-01), Chu
patent: 6276963 (2001-08-01), Avery et al.
patent: 6498727 (2002-12-01), Carr

Affiliated with

Also associated with

Rating

Tongue and groove gasket seam for EMI does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Tongue and groove gasket seam for EMI, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Tongue and groove gasket seam for EMI will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3005689