US1786154A - Radiotube - Google Patents

Description

W. B. DRIVER RADIOTUBE Filed June 27, 1929 Dec. 23, 1930.

' wires and due to the fact of the j meme Dec. 23, 1930 UNITED STATES PATENT 10 FFICE wnmua a. mum, or mar omen, NEW mass! micron Application am June :7, me. sci-m I0. $14,049.

This invention relates to radio tubes.

It has been customary to make the plate material of radio tuba of solid sheet metal. A more effective operating tube can be secured by using a late material having openings therein. P ain round wire mesh has been used but such material has developed some unfavorable characteristics due to the fact that the wire mesh is composed of round rotruding ends of the wires. A further culty is found in the removal of foreign matter from the wire mesh which has a tendency to collect in the interstices of the crossed wires and II which has proved detrimental in' correct evacuation of the tube during manufacture and subsequently in effecting the proper functioning of the tube. One of the reasons for the utllization of a wire mesh plate material is the increased heat radiating qualities over a solid plate.

One of the objects of this invention is to provide a radio tube with-a form of late that will have the combined good qua ities 5 of a solid metal late and a round wire mesh without any of t e bad qualities of either of the two materials.

Still another object of this invention is to provide a plate material for radio tubes having a plane surface of uniform thickness and with a relatively large number of openings therein.

Still another object of this invention is to provide a plate material wherein the ratio of the openings to the solid material can be readily varied or controlled to obtain the bestcharacteristics for a particular tube.

A further object of this invention is to provide a radio plate material having a plurality of openings therein and wherein the metallic surfaces are smooth and form plane surfaces having no interstices of crossed wires to 001- lect dirt, which latter hinders the properevacuation of'the tube during manufacture. A further object of this invention is to provide a smooth solid edge for the plate material formed from the w1re mesh and integral therewith to obviate the bad characteristics of the protruding ends of a wire mesh.

59 Referring to the drawings:

Fi e 1 is a plan view of the plate materiafi a Figure 2 is an end view of Figure 1.

Figure 3 is an end view of the material without a selvedge edge.

Figure 4 is a view of a radio tube embodyingFmy invention In' carrying out my invention I propose to make the plate 1 from two pieces 0 meshma-. 'terial 2 and to weld the free ends to sup rting conductors 3. An alternative methoxii to make the plate 1 of a single piece of mesh 2 and to weld same together and to the electrical conductors 3. In a previous application Serial No. 370,721 filed June 8, 1929, I have more fully described the methodof making and-the form of mesh which I have found to be advantageous as a plate material. Mesh 2 is a wire mesh which has been rolled under i re 5 is'a sectional view along the line '5, 5, coking in the direction of the arrows.-

pressure to form the two surfaces of the mesh into plane surfaces and the wires into substantially the same plane. The mesh 2 preferably has formed around its edges a solid selvedge of the same thickness and in the same plane as the mesh. This selvedge is made integral with the mesh and from the wires of the mesh itself. Mesh 2 having a smooth metallic surface has no interstices between crossed wires to collect dirt and can be readily cleaned and kept cleaned in' the process-of manufacture. The solid selvedge edge has the same effect as an edge of a solid piece of plate material, that is, it does not have the protruding wires of the ordinary round mesh aving no such selvedge and therefore will function more perfectly.

As the size of the openings may be controlled in the mesh by the degree of rolling,

the mesh may be made to fit the exact characteristics of any particular tube.

It will thus be seen that I have invented a radio tube having a plate material ada table to the characteristics of different tu s and which will embody the good qualities of both a solid plate material and a round wire mesh without the disadvantages of both.

WhatI claim is:

1. A plate for a radio vacuum tube of wire u mesh the metallic surfaces of said mesh being glans surfaoesgthe free edges of said mes having a substantially solid metallic selved e integral with the wires and in the same ane as the wire mesh. I v

2. plate for a radio vacuum tube of wire mesh, the wires of said mesh in substantially the same lane, the surfaces of said mesh be- "ing smoot the free edges of said wire mesh having a substantially solid metallic selvedge integral with the Wires in the same plane as the wire mesh. I

Si ed at Newark in the coun of Essex and tate of New Jersey this 18th ay of May, A. D. 1929.

WILBUR B. DRIVER'

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