Cathode ray tube base

Claim 1

In combination, a cathode ray tube and a base therefor, said cathode ray tube having a cylindrical terminal portion closed by a substantially planar wall provided with a plurality of annularly arrayed, spaced, projecting tube pins each surrounded by a raised circumferential nubbin with a diameter larger than said pins where said pins exit from said wall, said base comprising: a circular rim having a given diameter surrounded by a peripheral wall having a given internal wall height; a plurality of tube pin receiving apertures extending through said rim, said apertures being spaced inwardly from the inner circumference of said peripheral wall and being annularly arrayed; a hollow, substantially centrally located crown positioned on said rim on a side opposite said peripheral wall and projecting therefrom, the internal portion of said crown being adapted to receive the terminus of an exhaust tubulation, the outside circumference of said crown having a diameter equal to the diameter of the inside edges of said tube pin receiving apertures and being further provided with a plurality of radially extending fins, said fins being located between said apertures; and an electrically insulating, soft washer fitted within said peripheral wall, said washer having a thickness greater than the internal height of said peripheral wall and being further provided with a plurality of apertures matching in number and location said tube pin receiving apertures in said rim, said apertures having a diameter closely matching the diameter of said nubbins.