Browse Prior Art Database

Self-Leveling Mounting Foot

IP.com Disclosure Number: IPCOM000099671D
Original Publication Date: 1990-Feb-01
Included in the Prior Art Database: 2005-Mar-15
Document File: 3 page(s) / 117K

Publishing Venue

IBM

Related People

Day, G: AUTHOR [+3]

Abstract

A manufacturing method is described to simplify the fitting of cathode ray tube assemblies into covers by means of self-adjusting mounts that eliminate large tolerances. It removes the need to adjust the position of an Integrated Tube Assembly (ITC), relative to the mask on a monitor, by providing a low-cost method of taking up the ITC Lug position tolerance. Torque is automatically controlled to the mounting screws, and assembly time is reduced. The principle can be applied to other mechanical components with similar tolerance restraints.

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

Self-Leveling Mounting Foot

       A manufacturing method is described to simplify the
fitting of cathode ray tube assemblies into covers by means of
self-adjusting mounts that eliminate large tolerances.  It removes
the need to adjust the position of an Integrated Tube Assembly (ITC),
relative to the mask on a monitor, by providing a low-cost method of
taking up the ITC Lug position tolerance.  Torque is automatically
controlled to the mounting screws, and assembly time is reduced.  The
principle can be applied to other mechanical components with similar
tolerance restraints.

      The ITC in a touch-screen display monitor has to be mounted so
that it is clear of the enclosure except for strain gauge mounting
points and cables.  A critical clearance area is the mask to ITC
front which must always have clearance.  This can be achieved either
by the method described or by the more costly manual adjustment of
the clearance at the time of assembly. The face of the ITC, close to
the mask area, is accurately dimensioned and can be used for location
but not for attachment.  The ITC mounting lugs, relative to this face
(front to back) and to each other, are not accurate.  The lugs must
be supported to ensure that the ITC is firmly secured throughout the
life of the product.  The design of the self-leveling mounting foot
ensures that the ITC is firmly attached and that the required
clearance is maintained.

      In the embodiment described, the glass ITC is fitted into a
mounting frame.  Attached to this frame are four strain gauges, which
attach to the front cover.  Fig. 1 shows a view of the top left hand
side corner of the ITC 1 ready to be fitted to the mounting frame 2;
the same arrangement exists at the other three corners of the ITC.
The mounting frame 2 has four datum areas 3, which locate on the ITC
face 4.  There are four jacking bushes 5 fitted to the frame. These
bushes 5 locate under the ITC lugs 6.  The bushes 5 are free to
rotate and move laterally in the frame 2 but are captive from
accidental removal, prior to fitting of the ITC.  The objective at
final assembly (Fig. 4) is for ITC 1 to be mounted against the datum
areas 3 with the lugs 6 firmly s...