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RESTRAINING EYELET FOR TWIST PIN INTERCONNECT SYSTEM

IP.com Disclosure Number: IPCOM000005450D
Original Publication Date: 1982-Jan-01
Included in the Prior Art Database: 2001-Oct-10
Document File: 2 page(s) / 82K

Publishing Venue

Motorola

Related People

Bakulesh Patel: AUTHOR

Abstract

When a twist pin (made by T.R.W. and I.T.T.) and a conventional type eyelet for an interconnect system is used for connecting plug-in modules to P.C. boards, the eyelets make electrically unreliable con'nection when subjected to transverse shock loading on the module. When a plug-in module is sub- jected to transverse loading, permanent deformation in the bulge diameter of the tWiSt pin sometimes OC- curs to an extent that its diameter becomes smaller than the internal diameter of the eyelet. This creates an ideal condition for an electrical intermittance. Due to the nature of the design of the twist pin, the per- manent deformation in the bulge diameter can occur even when the plug.in module is subjected to very low transverse shock levels. Severe damage to the bulge of the twist pin can occur during insertion and removal of the module when the pin is pulled or pushed in a direction other than that normal to the eyelet socket.

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@ MOTOROhA Technical Developments Volume 2 January 1962

RESTRAINING.EYELET FOR TWIST PIN INTERCONNECT SYSTEM

By Bakulesh Pate1

   When a twist pin (made by T.R.W. and I.T.T.) and a conventional type eyelet for an interconnect system is used for connecting plug-in modules to P.C. boards, the eyelets make electrically unreliable con'nection when subjected to transverse shock loading on the module. When a plug-in module is sub- jected to transverse loading, permanent deformation in the bulge diameter of the tWiSt pin sometimes OC- curs to an extent that its diameter becomes smaller than the internal diameter of the eyelet. This creates an ideal condition for an electrical intermittance. Due to the nature of the design of the twist pin, the per- manent deformation in the bulge diameter can occur even when the plug.in module is subjected to very low transverse shock levels. Severe damage to the bulge of the twist pin can occur during insertion and removal of the module when the pin is pulled or pushed in a direction other than that normal to the eyelet socket.

   The restraining eyelet, as shown in Figure 1 is used with a twist pin to make an electrically reliable in. terconnect system for plug-in modules. The restralnlng eyelet not only protects the twist pin on a module under transverse shock loads but also provides a redundant electrical contact between a module and a
P.C. board. The use of a restraining eyelet forces the operator to insert or remove the plug-in module in a normal direction and thus no d...