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TAMPER PROOF, 90º DIRECTIONAL STRAIN RELIEF FOR RIBBON CABLES THAT EXIT INJECTION MOLDED HOUSINGS

IP.com Disclosure Number: IPCOM000006748D
Original Publication Date: 1993-Mar-01
Included in the Prior Art Database: 2002-Jan-29
Document File: 2 page(s) / 87K

Publishing Venue

Motorola

Related People

Jim J. Johnson: AUTHOR

Abstract

In the Secure Telecommunications business there exists a need for special function modules to accom- pany the end user's telephone. These special function modules must attach mechanically and electrically to the phone in a way that allows for flush mounting. In doing so, the electrical interconnection must 1) be strain relieved, 2) exit the special function module in a manner that is tamperproof for security protection, 3) be easy to assemble and 4) have minimal cost impact.

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MOTOROLA INC. Technical Developments Volume 18 March 1993

TAMPER PROOF, 90" DIRECTIONAL STRAIN RELIEF FOR RIBBON CABLES THAT EXIT INJECTION MOLDED HOUSINGS

by Jim J. Johnson

   In the Secure Telecommunications business there exists a need for special function modules to accom- pany the end user's telephone. These special function modules must attach mechanically and electrically to the phone in a way that allows for flush mounting. In doing so, the electrical interconnection must 1) be strain relieved, 2) exit the special function module in a manner that is tamperproof for security protection, 3) be easy to assemble and 4) have minimal cost impact.

  Injection molded features address the problems associated with strain relieving cable without the use of either restraining parts or bulkhead connectors. This elim- inates added items in the bill of materials and added costs related to assembly touch time. Additionally, this feature allows for a completely tamper proof II0 and accommodates modular flush mounting.

As illustrated in Figure 1, a ribbon cable is connected to a printed wiring board (PWB) using conventional

means. The printed wiring board is mounted inside a set of injection molded housings. The ribbon cable is routed out of the lower housing cavity across the lower strain relief feature which is located on the molding parting line. A small strip 'of an elastomeric material is provided for Z-axis tolerance accommodation. When the top and bottom housirigs are as...