Browse Prior Art Database

Radio Frequency Interference-Shielded Connector System

IP.com Disclosure Number: IPCOM000040023D
Original Publication Date: 1987-Sep-01
Included in the Prior Art Database: 2005-Feb-01
Document File: 2 page(s) / 67K

Publishing Venue

IBM

Related People

Ett, AH: AUTHOR

Abstract

The disclosed invention provides a low cost means of effectively terminating shielded cables to provide both strain relief and a radio frequency interference (RFI)-tight termination. Two elements are described: the cable terminator and a feed-through connector. The invention includes two metallic grommets of near nesting sizes having wide flanges. The shielded cable is stripped back to reveal the insulated conductors and to provide for their attachment. The shield braid is exposed for a short distance, approximately 0.5 inch. The attaching nut is slipped on the cable prior to installation of the grommets since it would not be possible to place it on after the fact. One grommet is pushed over the shield braid and under the outer insulating jacket.

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Radio Frequency Interference-Shielded Connector System

The disclosed invention provides a low cost means of effectively terminating shielded cables to provide both strain relief and a radio frequency interference (RFI)-tight termination. Two elements are described: the cable terminator and a feed-through connector. The invention includes two metallic grommets of near nesting sizes having wide flanges. The shielded cable is stripped back to reveal the insulated conductors and to provide for their attachment. The shield braid is exposed for a short distance, approximately 0.5 inch. The attaching nut is slipped on the cable prior to installation of the grommets since it would not be possible to place it on after the fact. One grommet is pushed over the shield braid and under the outer insulating jacket. The second slightly smaller-diameter grommet is slid over the insulation under the shield braid (or shielded conductors), and pushed in under the shield braid. The two diameters are so chosen that with the shield braid in place between them, a very strong interference fit occurs. A tool is used to force the inner grommet into the shield and outer grommet, providing a gas-tight connection between individual wires in the shield braid and the two conductive grommets. The exposed braid is fanned out between the grommet flanges, and trimmed, if necessary. A cross-section of a cable with the two grommets in place is illustrated in Fig. 1. If desired for further strength, t...