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Browse Prior Art Database

Cathode Ray Tube Band Tension Verification

IP.com Disclosure Number: IPCOM000074217D
Original Publication Date: 1971-Mar-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Selzo, CA: AUTHOR

Abstract

A tension band properly applied about a cathode-ray tube provides protection against implosion of the tube, but a tube with an improperly applied band or one which has slipped after application may lack the expected protection. The defect may be hidden and not easily detected by ordinary inspection. As an answer to this problem, scribe marks or other indicia can be placed on the band a known distance apart so that the elastic stretch in a properly applied band can be utilized as a measure of the tension in the band.

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Cathode Ray Tube Band Tension Verification

A tension band properly applied about a cathode-ray tube provides protection against implosion of the tube, but a tube with an improperly applied band or one which has slipped after application may lack the expected protection. The defect may be hidden and not easily detected by ordinary inspection. As an answer to this problem, scribe marks or other indicia can be placed on the band a known distance apart so that the elastic stretch in a properly applied band can be utilized as a measure of the tension in the band.

Cathode-ray tube 10 has a tension band 12 applied about the periphery of the tube adjacent the edge of the face plate 14. Band 12 is applied by a tool which, when properly used, places the band under considerable tension, and this tensioned condition is maintained by welding the overlapped band or applying a crimped sealer 16. Prior to application, the band is scribed at positions 18 and 20, a predetermined distance apart. As band 12 is applied, it undergoes a slight amount of elastic stretch whereby the scribe marks 18, 20 are moved toward each other and the distance 22 between them around the tube is slightly increased. For example, a tension band for a 15 or 16 inch cathode-ray tube may stretch in the order of 0.25 inch when placed under 1,650 pounds tension. Accordingly, measurement of the distance 22 enables verification that the specified tension has been applied, and still exists.

Additional marks may...