Browse Prior Art Database

Circuit Card Insertion Extraction Retention System

IP.com Disclosure Number: IPCOM000109175D
Original Publication Date: 1992-Aug-01
Included in the Prior Art Database: 2005-Mar-23
Document File: 2 page(s) / 82K

Publishing Venue

IBM

Related People

Caldwell, RN: AUTHOR [+2]

Abstract

Disclosed is a circuit card insertion/ extraction/ retention system for a card on board package which is insensitive to card and cage tolerances.

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

Circuit Card Insertion Extraction Retention System

       Disclosed is a circuit card insertion/ extraction/
retention system for a card on board package which is insensitive to
card and cage tolerances.

      Systems currently used for insertion/retention/extraction of
circuit cards do not perform well in cages with large tolerances.
This is becoming more of a problem with the increased use of sheet
metal cages and card guide hardware which have inherently large
tolerances.  The problems solved are:
1.   Connectors not being fully plugged (short card, long package).
2.   High stresses resulting in long-term permanent deformation of
the card and planer (long card, short package).
3.   Insertion/extraction handles have a wide range of final
positions when the card is inserted.  This results in possible
interference with other subassemblies and is not aesthetically
acceptable to the customer.

      This article solves these problems while allowing a wide range
of tolerance in a card on board package.  It provides a limited,
predetermined insertion force and the same final rest position for
all handles regardless of tolerance.

      The system consists of 3 parts: actuation handle 1, camming
fork 2, and interface connection 3.  The actuation handle provides
mechanical advantage to insert the card into the cage.  The camming
fork is used to "cam" the card into (insertion) and out of
(extraction) the cage.  The actuation handle and camming fork are
connected along the pivoting axis 4.  The interface between the
actuation handle 1 and the camming fork 2 is a force release
mechanism such that the two pieces will pivot together until the
moment between the two exceeds some value.  Once this occurs the
handle 1 will move separately from the camming fork 2...