Browse Prior Art Database

High Performance Card-on-Board Connector Actuation System

IP.com Disclosure Number: IPCOM000112520D
Original Publication Date: 1994-May-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 2 page(s) / 90K

Publishing Venue

IBM

Related People

Campbell, JS: AUTHOR [+2]

Abstract

The disclosed invention provides even simultaneous plugging along the entire length of high I/O card edge connectors. This eliminates the need for redundant ABCM (hot plug) pins, and concern over damage to fragile high density contacts during connector plugging.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

High Performance Card-on-Board Connector Actuation System

      The disclosed invention provides even simultaneous plugging
along the entire length of high I/O card edge connectors.  This
eliminates the need for redundant ABCM (hot plug) pins, and concern
over damage to fragile high density contacts during connector
plugging.

      This invention relates to the interconnection of circuit boards
and cards utilizing a card-on-board cage packaging system.  Technical
advances in computer systems are demanding the ever-increasing need
for more and denser connector I/O.  Also, due to system requirements
to minimize computer system down time, the ability to "hot" plug
connectors is becoming a basic connector requirement.

      In most card-on-board high I/O connector systems the connectors
require a plug assist, since the connector insertion force is higher
than can be reasonably exerted by a human operator.  This plug assist
usually consists of either a lever at each end of the card/connector
assembly or a screw at each end.  Such assist mechanisms always
unavoidably, to some degree, "rock" the connector during plugging
since the assist at one end can never be guaranteed to simultaneously
operate with the other.  This rocking requires ABCM (hot plug) pins
to be redundantly located at each end of the connector, this
redundancy wastes valuable I/O.  Also, this rocking causes damage to
fragile high density contacts, thus connector density and reliability
is limited.

      In the disclosed invention a single assist screw in the center
of the connector length provides a connector plug force that does not
induce a "rocking" moment.  Additionally mechanisms within the
card/connector cage guides prevent "rocking" caused by unforeseen
moments during plugging.  Proper sequencing of ABCM (multiple length
hot plug) pins can be achieved without having redundant ABCM pins at
each end of the connector. ...