Browse Prior Art Database

CRT Retention Device

IP.com Disclosure Number: IPCOM000102383D
Original Publication Date: 1990-Nov-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 2 page(s) / 54K

Publishing Venue

IBM

Related People

Beeteson, JS: AUTHOR [+2]

Abstract

A cathode ray tube (CRT) retention design that eliminates the need from both CRT lugs and mounting screws is described. Standard CRT retention devices normally require lugs are then screwed to the monitor chassis or cover set. It results in designs requiring a thick bezel around the CRT glass to allow for the lug and screw and to leave sufficient room for the screwdriver to drive the screw home. The methods of CRT retention described do not require screws, or even lugs to achieve a reduction in the size of the monitor housing and manufacturing effort.

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CRT Retention Device

       A cathode ray tube (CRT) retention design that eliminates
the need from both CRT lugs and mounting screws is described.
Standard CRT retention devices normally require lugs are then screwed
to the monitor chassis or cover set. It results in designs requiring
a thick bezel around the CRT glass to allow for the lug and screw and
to leave sufficient room for the screwdriver to drive the screw home.
The methods of CRT retention described do not require screws, or even
lugs to achieve a reduction in the size of the monitor housing and
manufacturing effort.

      A new method of retention eliminates lugs 5 on the CRT 2 and
uses sprags 1 or 6 on a smaller lug 3 to retain the CRT 2
into a plastic bezel (not shown).  The sprags 1 may either be
provided as part of the tension band 8, as shown in Fig. 1, or as
part of a cable assembly 4, as shown in Fig. 2.  In the case of
the sprags 1 being part of a cable assembly, this may well provide
the function of the dag contact strap, thereby reducing the cost of
the overall assembly.  The sprags may either be in the form of a
formed flat blade 6 or a machined bar 1.

      To prevent loosening of the sprags 1 due to relaxation of the
plastic bezel over a period of time, it is essential that some form
of spring 7 be designed into the system, ensuring the sprag 1 is
always under tension.  In the case of the sprags being part of a
cable assembly, movement in the position of the CRT face would be
tot...