| 摘要 |
1,204,289. Cathode ray display tubes. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. 29 July, 1969 [1 Aug., 1968], No. 38051/69. Heading H1D. A method of providing an anti-implosion clamping band around a TV picture tube envelope which envelope has a mould match line 3, and the rim of the cup-shaped window portion secured to the cone portion by solder glass 7, comprises sliding the band on to the envelope from the window side, large diameter portion 10 first, until the band is entirely on the cone side of the line 3, the smaller diameter portion 9 then exerting a pressure on the envelope, the band being slid on such that its experiences no permanent deformation on passing the mould match line. The latter may be achieved by heating the band, or the narrow portion provided with slots (11) (Fig. 4, not shown) preferably either side of each comer of the normally rectangular band, one or more auxiliary clamping bands 12, 13 being fitted around the narrow portion when in place. Filler 14 may be epoxy resin or polyvinyl chloride, preferably so that ridge 7 remains free. An adhesive such as polyvinylacetate may be provided between band portion 9 and the envelope portion (5). The band may be manufactured by bending and welding a correspondingly profiled strip. Reference is made to colour TV picture tubes. |
