Browse Prior Art Database

Abrasive EMC Gasket Clip

IP.com Disclosure Number: IPCOM000103444D
Original Publication Date: 1990-Nov-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 1 page(s) / 41K

Publishing Venue

IBM

Related People

Barker, KH: AUTHOR

Abstract

Disclosed is an improved method for connecting electromagnetic compatibility (EMC) gaskets to sheet metal products. (Image Omitted)

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 93% of the total text.

Abrasive EMC Gasket Clip

      Disclosed is an improved method for connecting electromagnetic
compatibility (EMC) gaskets to sheet metal products.

                            (Image Omitted)

      Two types of roll-formed gasket carrier clips are generally
used for mounting EMC gaskets on sheet metal housings and covers to
provide electromagnetic shielding. The first type, (A), uses a smooth
clip which has no provision for penetrating any oxide or other
high-resistance coating on the surface of the sheet metal.

      The second type, (B), has periodically-spaced, pierced and
extruded holes whose rough edges cut through paint and surface oxides
to provide electrical continuity from the gasket to the sheet metal.
This also exposes bare metal to corrosion where the sharp edges of
the holes have dug through the paint and surface oxides and into the
metal during installation.  The formation of corrosion and the
reduced contact area due to the extruded holes affect the conduction
between the clip and the sheet metal.

      This invention, (C), adds a knurling station in the roll-
forming process which creates a raised, knurled surface on the gasket
clip in the area where it slides on the sheet metal.  The knurled
surface breaks down resistive coatings on the sheet metal as the clip
is installed on the metal flange.  It improves the conduction between
the clip and the metal by lowering the resistance to less than one
ohm.  The knur...