Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Interference Fit Positive DASD Grounding Strap

IP.com Disclosure Number: IPCOM000121545D
Original Publication Date: 1991-Sep-01
Included in the Prior Art Database: 2005-Apr-03
Document File: 7 page(s) / 251K

Publishing Venue

IBM

Related People

Howell, SE: AUTHOR [+2]

Abstract

This article describes a means to provide a conductive surface for grounding an electronic direct-access storage device (DASD). This conductive surface is a bridge between conductive-nonconductive-conductive surfaces.

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

Interference Fit Positive DASD Grounding Strap

      This article describes a means to provide a conductive
surface for grounding an electronic direct-access storage device
(DASD).  This conductive surface is a bridge between
conductive-nonconductive-conductive surfaces.

      Within any typical computer, there are three major devices.
One device is the primary circuit board, also known as the mother
board or planar board.  This device interprets input commands and
delivers output commands. Other devices are I/O circuit boards, also
known as feature cards or option cards.  These devices allow the
planar board output commands to be transferred to an exterior user
device.  Further devices are DASDs, also known as hardfiles or hard
drives.  These devices allow the user to store planar board output
commands for future use.

      Typically, the DASDs are grounded to the system ground via
plated plastic or plated sheet metal mounting through the plated
plastic DASD slides.  The grounding strap disclosed herein is
designed to attach to the plastic lower DASD support to ground the
DASD plated plastic slide to the system ground through an
interference fit design.  This fit insures positive surface contact.

      In the drawings, Fig. 1 isometrically displays in exploded view
the lower DASD ground strap.  Fig. 2 isometrically displays in
exploded view the lower DASD support.  Fig. 3 isometrically displays
in exploded view the DASD assembly.  Fig. 4 isometrically displays an
exploded view of the DASD assembly and the lower DASD support with
ground strap.  Fig. 5 isometrically displays an exploded view of the
planar board assembly, lower DASD support, system frame and lower
DASD ground strap, DASD assembly and required screws in the correct
installation orientation. Fig. 6 isometrically displays the completed
as sembly of the planar board assembly, lower DASD mount, DASD
assemblies, system frame and lower DASD ground strap.

      Referring to Fig. 1, the ground strap 1 provides an
interference fit between the grounding surface 2 and the plastic
plated DASD slide.  This insures a positive surface contact and a low
resistance ground patch to the system frame via the front screw down
4 and the rear hook 3.  In addition, the front and rear features
secure the part to the lower DASD support prior to the frame
assembly.

      Lower DASD support 5 (Fig. 2) provides a low cost DASD support,
DASD retention, planar support and alignment.  The use of this simple
multi-function part as a planar support requires the part not to be
metallic so that a ground strap is required to ground the DASD
assemblies to the system fra...