H - Electricity – 01 – J
Patent
H - Electricity
01
J
316/11, 313/35.1
H01J 29/07 (2006.01) H01J 9/18 (2006.01)
Patent
CA 1160676
ABSTRACT OF THE DISCLOSURE Apparatus is disclosed for assembling a frameless, relatively thin and torsionally flexible shadow mask and four relatively thick and inflexible mask-suspension braekets. The apparatus, which is for use in the manufacture of color television cathode ray picture tubes, provides for conforming of the brackets to the contour of the skirt of the mask, and the welding of the brackets thereto. The brackets according to the invention have a planar central section and two arms for the embracing of and attachment to the skirt around the corners of the mask. Each bracket has at least one region in each arm adjacent to the central section that is perforated to decrease the cross-sectional area of the region and thus increase electrical resistance of the region. When an electrical current is applied through the bracket, the magnitude of the current and the reduction in cross-sectional area of the region is effective to selectively resistively heat the region to a plastic state whereby the bracket can be conformed to the desired contour of the music without spring-back and without the deforming the mask. The method according to the invention provides for conforming the contour of the bracket to the contour of the mask.
370851
Dougherty Lawrence W.
Macrae & Co.
Zenith Radio Corporation
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