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Logic Book Grounding for PS/2 Cards

IP.com Disclosure Number: IPCOM000104064D
Original Publication Date: 1993-Mar-01
Included in the Prior Art Database: 2005-Mar-18
Document File: 2 page(s) / 59K

Publishing Venue

IBM

Related People

Peacock, JL: AUTHOR [+2]

Abstract

Described is a generic electrical grounding system allowing any PS/2* logic card to be mounted within a standard form factor AS/400* logic book with largely generic parts.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 63% of the total text.

Logic Book Grounding for PS/2 Cards

      Described is a generic electrical grounding system allowing any
PS/2* logic card to be mounted within a standard form factor AS/400*
logic book with largely generic parts.

      The overall design concept used for mounting PS/2 logic cards
in AS/400 logic books is shown in the figure.  PS/2 card 1 is plugged
to AS/400 card 2 and the resulting assembly is installed between
logic book covers 3 and 4 using intervening components for location.

      The logic book assembly is equipped with formed tailstock
bracket 5, screw fastened to book covers 3 and 4; AS/400 logic card 2
is located by, and fastened to bracket 5 via connector 6, which
protrudes through opening 7 in bracket 5 and is screw fastened.
Tailstock 5 is shown as a formed part having two side pieces serving
to cover the openings created by the extension of the tailstock
itself; in another design option (where covers 3 and 4 are of sheet
metal construction) tailstock 5 and the side pieces can, optionally,
be integrated with one of the covers.  The mating connectors between
cards 1 and 2 and the overall logic card mounting system do not allow
perfect locational tolerancing between connector 8 and EMC ground
plate 9 on PS/2 card 1 and the AS/400 tailstock bracket 5.  To
compensate for this tolerance variation and provide a positive
electrical ground for EMC protection, the following design is used.

      On bracket 5, two integrally formed flanges 10 at the...