Banded-type implosion protection cathode ray tubes

Claim 1

A combination of a cathode ray tube and an implosion protection tension band mounted on the periphery of the face plate of the cathode ray tube, said band comprising an annular reinforcing band which is so shaped, in advance of mounting of the same, as to be fitted to the periphery of the face plate, said annular reinforcing band being formed from an integral stamped flat metal strip, one end of which overlaps the other end substantially parallel to the adjacent periphery of said face plate and having lugs projecting from the edge of said strip; and interfitting means formed at the overlapped ends of said strip, said one end having an integral raised portion and said other end having an integral recess mating with said raised portion and adapted to be engaged for coupling together the opposite ends of said strip in fixed peripheral relation determined by said raised portion and said recess for accurately determining the inner peripheral length of said annular band, and a joint securing said overlapped ends to form said annular band with accurate said inner peripheral length which is sized to be under tension when thermally shrunk fit on said periphery of said face plate.