Browse Prior Art Database

Snaplock Card Retention for Six Sigma Design

IP.com Disclosure Number: IPCOM000108691D
Original Publication Date: 1992-Jun-01
Included in the Prior Art Database: 2005-Mar-22
Document File: 2 page(s) / 64K

Publishing Venue

IBM

Related People

Beaudry, J: AUTHOR [+4]

Abstract

This invention provides a means of retaining a card to a pin carrier within prescribed retention parameters, thereby allowing a change to a more dimensionally stable polymer material, for improving tolerance controls to meet six sigma design parameters.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 65% of the total text.

Snaplock Card Retention for Six Sigma Design

       This invention provides a means of retaining a card to a
pin carrier within prescribed retention parameters, thereby allowing
a change to a more dimensionally stable polymer material, for
improving tolerance controls to meet six sigma design parameters.

      In this application, the present means of retaining the card to
a pin carrier is by the use of epoxy at the end slots of the
pin carrier and the card edge surface.  The present epoxy adheres
well to the polymer and retains the card within specification limits.
However, the pin carrier tolerances cannot be held closer than three
sigma limits. Evaluation of bonding strength, with the help of a
polymer lab, for improved tolerance polymers was unsuccessful.  The
improved tolerances achieved by investigated polymers did not provide
the necessary retention with the available epoxys.

      A new method of card retention was required.  This was achieved
by a snap-lock feature in the pin carrier housing which provides both
the required retention forces and the tolerances to achieve six sigma
design.

      Figs. 1, 2, and 3 show the end, top and side views,
respectively, and indicate the snap-lock retention features for the
assembly.  In Fig. 2, two rows of pins and card slot lead-in bevels
are shown.  As the card is vertically inserted into the end slots and
between the rows of pins in the pin carrier, the continued insertion
of the card arrives at the...