US2042929A - Electron discharge device and anode therefor - Google Patents

Description

June 2, 1936. G. M. DINNICK ELECTRON DISCHARGE DEVICE AND ANODE THEREFOR Original Filed June 1, 1933 INVENTOR a m p/MV/C/f. 26 i ATTORN Patented June 2, 1936 UNITED STATES ELECTRON DISCHARGE DEVICE AND ANODE THEREFOR George M. Dinnick, Bloomfield, N. J., assignor to Westinghouse Lamp Company, a corporation of Pennsylvania Original application June 1, 1933, Serial No.

673,865. Divided and this application December 28, 1935, Serial No. 56,447

3 Claims.

This invention relates to electric discharge devices and more particularly to devices of this character adapted to be employed in the radio field, and constitutes a division of my copending application Serial No. 673,865, filed June 1, 1933.

In its more specific aspect the invention is directed to an improved electric discharge device .and especially to an improved anode that may be employed therein. .Heretofore it has been customary to employ electric discharge deviws comprising an anode, a cathode and a grid in the radio receiving and other fields.

The anode generally in tubular form comprises a plurality of similar plates secured together by a nut and bolt arrangement or having interlocking means serving this purpose. As distinguished from the prior art my invention is directed to a composite unitary hollow anode having excellent heat radiating properties and being adapted to be readily manufactured and mounted in an electric discharge device such as a radio tube.

My invention is further directed to an improved discharge tube which embodies my improved anode and may be readily seasoned by induction heat treatment without the necessity of electron bombardment. Because of my novel anode, the cathode and grid of a radio tube embodying the same are suitably treated when a high frequency induction coil surrounds the tube containing them.

An object of my invention is to provide an improved electric discharge device which may be readily manufactured and seasoned.

Another object of my invention is to provide an improved anode which may be readily manufactured and mounted in a discharge device and which has good heat radiating properties.

Other objects and advantages of my invention will become readily apparent from the following description and drawing wherein:

Figure 1 represents a longitudinal front view with parts broken away of a discharge device embodying my invention and with the envelope of the device not shown;

Figure 2 represents a perspective view of an anode embodying my invention;

Figure 3 represents a horizontal cross sectional view of Fig. 2 taken at about the mid-length thereof;

Figure 4 represents a horizontal cross sectional view of an anode embodying my invention and being a modification of the anode shown in Fig. 2.

As illustrated, the electric discharge device in the form of a radio tube comprises an envelope consisting of a body portion (not shown) and a re-entrant stem I0 extending upwardly into said body portion. Said re-entrant stem [0 has a press I in which are secured a plurality of spaced conductors l2, I3 and 14 extending interiorly and exteriorly of said envelope.

A fiexible metallic band I5 is wrapped around the stem [0 below the press thereof and is in frictional engagement therewith by means of the nut and bolt arrangement l6. At one side of said press are a plurality of standards I l and i8 which are welded to said band l5 and extend upwardly in said envelope. A corresponding pair of standards are secured to said band at the other side of said press. and arev welded to each other at that portion where the standard 18 terminates. The standard films the major portion thereof extending upwardly in said envelope and substantially parallel to the longitudinal axis thereof an ap preciable distance above the upward limit of the standard 18.

A cruciform press 19 having diametrically disposed openings in one of the cross arms thereof has the upper portion of the standards ll extending through these openings, with the cross arm of the insulator I9 resting upon the upper limit of the standards H3. The other c'ross arm of the insulator l9 has a plurality of openings therein adapted to accommodate conductors and supports 20, 2|, 22 and 23. A suitably sized wire is helically wound around the conductors 20, 23, and serves as the grid element of the tube. An M-shaped filament, having its ends secured to the conductors 2| and 22 and having its upper bight portions secured to a pair of hooks, hereinafter described, serves as the cathode element. A small shallow carbon disk 24 having a circular opening therein is mounted on each of the standards ll.

In accordance with my invention a rigid composite unitary anode 25 surrounds the grid and cathode. The anode comprises an elongated hollow member consisting of two flat sides 26 of sufiicient width and arranged parallel to each other and integral with two curved portions 21 forming the other sides. A cross sectional view of said anode which is in the form of a hollow shell at right angles to its major axis, is in the form of a rectangle having rounded ends. width of each of said flat sides and extending along the entire length thereof are outwardly extending lateral extensions 30. Each extension 38 is of appreciable cross-sectional area and has a longitudinally disposed opening 3| along the The standards I! and I8 converge At the midopenings or grooves in the lateral extensions. U These lateral extensions may be solid throughout their cross section and any suitable means such as clamps, may be in contact therewith to hold the same in position.

The anode, which is a single element structure, may be readily formed by a machining operation or it may be manufactured by extruding a suitable plastic of graphite and easily carbonizable binder after which extrusion step the plastic ele ment may be fired to complete carbonization and dryness. This composite unitary anode is com posed essentially of graphite for good heat radiating properties which is one of the desirable features of an anode.

My anode, as heretofore described, may be readily assembled in an electric device by merely sliding the standards such as I1 through the longitudinally disposed openings 3|. The diameter of the openings is substantially thesa'me 'asthat of the standards H. A small shallow disk 26', the same type as the'disks heretofore described, has openings therein through which the upper portion of the standards l1 extend so that these disks rest upon the lateral extensions of the anode. A cruciform insulator 32, similar to the insulator l9, also has openings therein adapted to accommodate the standards I! which extend therethrough and project upwardly therefrom.

The insulator 32 has openings adapted to accommodate the conductors 2E! and 23 which extend therethrough. Short cross bars 33 are welded to the upper portion of the conductor 20 im mediately adjacent and above the insulator 32. .A cross bar is also welded to the lower portion of the conductor 23 immediately adjacent and below the insulator l9. Hooks 29, which support the upper bights of the filament, have the shanks jthereof integral with springs which rest in small recesses in the upper face of, the insulator 32, with the shanks thereof extending through openings in said insulators.

Resting upon the insulator 32 and adjacent the I outer portions thereof and welded to each of the standards I! above the insulator is an inverted U-shaped rod 35 having the sides thereof welded to the standards I! and I8 at the places where the sides of said U-shaped rods and standards intersect. to one of the standards I! and is hermetically sealed to a portion of the envelope other than the press and extends exteriorly of said envelope to form a terminal'for the anode.

It is apparent that this invention is susceptible to modifications and it is not to be limited by the 'exact structure herein disclosed, but only by the lpriorart.

What is claimed: 1. An electron discharge device including a stem, an anode, a cathode, said anode surrounding said cathode, said anode being a composite single unit composed of carbon, said anode being in the form of a hollow'tubular shell with extensions thereon and' a plurality of standards carried by said stem,'said extensions having -openingstherein, said standards extending into said openings.

2. An electron discharge device including a stem, a cathode, a grid, a pair of standards car;-

ried by said stem, and an anode, said anode be- A conductor 36 is electrically connected ing a single piece and being composed of a composite graphite unit, said anode being of tubular form with lateral extensions having openings therein in the direction of the length thereof, said standards extending into said openings.

3. An electron discharge device comprising a stem, a plurality of standards carried by said stem, an anode, a cathode and a grid,said anode having lateral extensions and surrounding said cathode and grid, said anode being. in theform of a single piece hollow shell, said lateral extensions extending along the length of said shell and having openings therein adapted to 'accommodate said standards, said standards being located in said openings, said anode being a composite unit of graphite.

GEORGE M. DINNICK.

DISCLAIMER 2,042,929.Ge0rge Z11. Binnie/c, Bloomfield, N. J. ELECTRON DISCHARGE DEVICE AND ANODE THEREFOR. Patent dated June 2, 1936. Disclaimer filed November 10, 1937, by the patentee; the assignee, Westinghouse Electric d:

anufactu'ring Company, consenting.

Hereby enters this disclaimer to claims 1, 2, and 3 of said patent.

[Oficial Gazette November 30, 1.937.]

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