Browse Prior Art Database

Self-Retained Input/Output Ground Spring for Circuit Devices

IP.com Disclosure Number: IPCOM000101098D
Original Publication Date: 1990-Jun-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 4 page(s) / 161K

Publishing Venue

IBM

Related People

Cooke, K: AUTHOR [+3]

Abstract

A ground spring device is described which is used to secure and provide electro-magnetic integrity for circuit devices in a computer system. It incorporates a snap mechanism to supply the required holding force and to enable preassembly and ease of replacement of the spring.

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

Self-Retained Input/Output Ground Spring for Circuit Devices

       A ground spring device is described which is used to
secure and provide electro-magnetic integrity for circuit devices in
a computer system.  It incorporates a snap mechanism to supply the
required holding force and to enable preassembly and ease of
replacement of the spring.

      In prior art, input/output (I/O) circuit device ground springs
were permanently welded or staked to the system's base frame.  Should
the spring become damaged, spring replacement would be difficult.
The concept described herein eliminates the need to weld or stake the
ground spring to the base frame.  However, the snap action of the
self- retained ground spring continues to provide the functional
requirements in meeting electro-magnetic interference (EMI) and radio
frequency interference (RFI) standards.

      Fig. 1 isometrically illustrates in an exploded view the use of
the self-retained ground spring in a typical base assembly.  Shown is
system enclosure 1, inner base frame 2, base frame-to-power supply
ground strap 3, disk frame 4, disk cable 5, ground spring 6, blank
I/O brackets 7 for holding circuit cards, and rear bezel 8.  Ground
spring 6 is installed by press snapping formed finger snaps 9 into
inner base frame 2 at adjoining window opening 10.  Should ground
spring 6 become damaged in any way, replacement would be made by
unsnapping it from the base frame and re-snapping a new one in its
place.

      Fig. 2 illustrates the use of ground spring 6 preassembled to
inner base...