Browse Prior Art Database

Advanced Processor System Packaging

IP.com Disclosure Number: IPCOM000122122D
Original Publication Date: 1991-Nov-01
Included in the Prior Art Database: 2005-Apr-04
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Finck, EF: AUTHOR [+2]

Abstract

Disclosed is a device by which the present 9021 and 9121 Power Supply Extension Tool Assembly (Fig. 1) is enhanced to provide more than the maximum capacity required for support of Concurrent Maintenance in servicing power supplies. A new Extension Assembly (Fig. 2) provides this enhancement via failsafe insulted socket that is stronger than the yield strength of the screws it is designed to torque and untorque.

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Advanced Processor System Packaging

      Disclosed is a device by which the present 9021 and 9121
Power Supply Extension Tool Assembly (Fig. 1) is enhanced to provide
more than the maximum capacity required for support of Concurrent
Maintenance in servicing power supplies.  A new Extension Assembly
(Fig. 2) provides this enhancement via failsafe insulted socket that
is stronger than the yield strength of the screws it is designed to
torque and untorque.

      The extension assembly is made up of a standard Snap-On 3/8
drive, 10 mm socket and an extension driver.  There is a gap between
the socket female recess and the male drive boss dimensions that is
filled with a dielectric epoxy.  The epoxy provides an insulated
interface from the screw to the driver while maintaining the socket
in a fixed position on the extension.

      The gap is maintained during assembly, while the epoxy is in a
liquid state, by the addition of 4 nylon filaments (Fig. 2) installed
over the drive boss just prior to the socket being installed.  After
the epoxy has cured, the assembly is an integral unit.  Because there
are no voids, the torque applied to the interface results in a
compressive force only being applied to the epoxy.

      Reliability tests bore this out as all the test screws were
broken and none of the interface joints broke.  The tool passed the
tests as it was stronger than the hardware it serviced.