O¢t. 22, 1946. ‘ `H. J. BAILEY ELECTRON DISCHARGE DEVICE Filed April> 8, 1942 2,409,667 Patented Oct. 22, 1946 2,409,667 UNITED ` STATES ` 2,409,667 PATENT , OFFICE ` ` ELECTRON' DIS CHARGE’ DEVICE HamptonÍ .1. Dailey, Bloomfield, N. J., assigner to Westinghouselileçtric Corporation, East Pitts# burgh, Pa.,V a corporation of Pennsylvania ` Application April 8, 1942, Serial No. 438,141 6 Claims. ` (o1. 25o-27.5) " 2 In the specific embodiment df the `invention i1 lustrated` in saidldrawing, the reference numeral This invention relates to electron discharge de_-` vices, and more particularly to appurtenances il) designates an electron discharge device ingen. eral, the one chosen for exempliiication hereinïbeè,` thereto for prolonging the useful life thereof. In various electron discharge devices or tubes, especially those employing or developing high power, considerable strain is developed through heat and otherwise which ultimatelyresults in the tube becoming defective or otherwise undesirable ing specifically a transmitting‘tube. . Said device’` or tube, Which,»of cou-rse, utilizes the usual-triode electrodes, is shown as having one of those elec. trodes, namely, metallic> anode H, also` constitut or not usable. The prevailing use of anodes and other' electrodes as parts of the envelopes, sealed to the glass portions _of such-envelopes, renders the need for corrective means vmore. imperative. Either a high temperature gra-dient or a_ high electro-static iield> gradient atv the seal between themetal and the glass of‘duplex envelopessuch asmentioned, is an adverse gradient and-a .di-rect l. 0 ing a part `of the envelope.' Said electrode isa generally cylindrical structure with a closed outer end and vvith its inner end shown featheredged at i2 for ¿obtaining `a yieldable junction with the marginal lindrical but endof-of. glass. portion 13„vvîhich i is likewise i ¿ Al Around the cylindrical electrode, such as anode Il shown, is applied'my improved heat-exchange cause of failure of the devices. In tubes utilizing er cooling means I4 which is preferablyY consti or developing high power, the anode. beGQ'mes very ho-tand its situation -at tlîleexterior- of theV tube is desirable V'for dissipation of _heat notwith standingY the resultant comlfllication` 0f ytempera--` tuted by a plurality of metallic heat conductive ñns I5 radiating ¿from a heat conductive metallic l inner collar surrounded by a metallic heat con perature change are both adverse gradients. The present invention is directed primarily to ductive outer cellar `l 9. More speciñcally, the `fins l5 are preferably plates, each having the opposite vertical margins lli, ll thereof bentY laterally .in opposite `directions `forming aleshape` in cross section. One of those‘bent margins <.is `Wider than and has for an object provision of an adequate, the other,` the more narrowrone .H5 beingireferredV practical and readily assembled and applied to as the inner flangev and the other margin ‘ I7 ture gradient between-it` andthe glass.A High difference oftemperature-and high rate of tcm means for aiding in reduction ofdetrimcntal gra.F of Wider dimension being referred to as the outer dients affecting `the seal. ' flange. The ñns are arranged in, an annular se ‘ i A further object is to promote economy ‘of 30 quencefvvith the longitudinal edge of the 4‘inner margin or flange l5 of one fin bearing againstthe fabrication in effecting attachment of the adverse body surface of‘the finnext‘beyond and thelon gradient reducing> means tothe electrode. gitudinal edge of the outer flange I1 bearing Another object of the invention is to `provide a against `the body‘surface of the iin next behind heat exchange or coolin means which will ob. 35 in the sequence. The ñange dimensions aroma-de tain air circulation for the purpose. such that the ling will be symmetrically~ disposed .A further object of the invention is to 4provide about the inner collar I8 when juxtaposed to each parts which `establish spacing fand fposition `of other as` just described, and the `inner flanges the parts by juxtaposing'îthe same, as Well as will atsuch time all be in engagement with said firmness and ‘non-vibration in use. ’ Yet another object is toovercome electro-static 40 collar which in turn is tightly mounted on .the outer` surface of the anode l l and soldered theref gradient at the featheredge seal. of the metal elec to if so desired.` lt will be observed thatthe suc,-` trode portion tothe ’glassportion` of the envelope. cession of flanges constitutes substantially con» Still furtherfobjects ofthe 'invention will ap tinuous cylindrical surfaces at the inner andouter pear to thoseskilled in the art as the description progresses, both by direct statement thereof and 45 ends ofthe ñns. Around'the .outer cylindrical by implication from the context. s ‘ l ` In the accompanying’rdrawing, wherein‘like numerals „of . reference Vindicate similar parts throughout the several views: Figure 1 is a sectional elevation of my inven tion applied to a transmitting tube; j Figure 2 is a horizontal sectional View of the same through the heat exchange means; and Figure 3 is a perspective view of one of the fine forming parts of the heat exchange means, surface formed by the outer flanges islsituated said outer collar i9, both of said collars I8 and I9 beingpreferably of equal depth as the‘iins and of appropriate diameter t0 be in physical contact with the said cylindrical surfaces throughout. The plane of the plate part of each iin, that is, the leg of the Z~shaped cross-section, slopes with respect to a radial plane of the ring intersecting said leg. Variation of that slope may occur in 55 assembly or in use to accommodate fthe outer 2,409,667 3 4 diameter of the ñn assembly to the inner di ameter of the outer ring. ’I'he flanges I6, Il of the fins are preferably se cured, as by silver solder, to the surfaces against vice having a glass-to-metal substantially cylin drical junction, _ring-shaped means carried by said device as part thereof longitudinally dis placed from and within effective heat-transfer range of said junction and with the metal and glass margins next the junction fully exposed below said ring-shaped means for reducing ad verse temperature gradient affecting said junc tion, and fins above said exposed margins next the junction extending outwardly from said de vice to said ring-shaped means supporting the which they abut, whereby the fins are rigidly secured at their inner ends to the inner collar I8 and hence to the electrode and at their outer ends to the outer or fin-encircling collarjlS. The structure is therefore ñrm and will not vibrate, and gives maximum area for heat conduction from the electrode to the fins and from the fins to the outer collar. The mode of fabrication, par same and transferring heat thereto by conduc ticularly in attachment of the fins by flanges next tion. the inner collar and similar flanges next the outer 2. In combination, an electron discharge de collar results in a great saving in machine work 15 vice having a glass-to-metal substantially cylin and with improved product, especially over con drical junction with margins of the metal and structions where slots have been milled to receive glass next said junction exposed outwardly, ring edges of the ñns. By virtue of the construction shaped means encircling said device substantially set forth, the body portions of the successive fins opposite and within eiïective electro-static range are spaced from each other and, with pairs of of said junction for reducing adverse electric flanges, provide vertical llues 2U open'at tcp and gradient affecting said junction, and means car bottom. A positive circulation of air past the en ried by yan external part of said device at a dis tire iin surface is accomplished and maximum tance from said junction supporting said ring~ cooling or heat exchange is effected. Heat trans shaped means in ñxed position opposite said junc mitted by conduction to collar IS is dissipated tion. from the outer surface; thereof by reason of its 3. A cooling means for an electron discharge exposure to the atmosphere. vAccordingly the device having a metallic electrode as an outside temperature gradient between metallic anode and part of an envelope, comprising a collar around glass portions of the envelope is reduced ma said electrode, a plurality of fins radiating from terially. 30 said collar and having flanges next the collar It is likewise desirable to reduce the electric gradient at the juncture of glass and metal. This result is accomplished by providing a metallic sleeve 2| depending from the inside of the anode forming a continuous surface around and in con tact with said collar. 4. A cooling means for an electron discharge device having a metallic electrode as an outside downwardly past the region of the junction being 35 part of an envelope, comprising a plurality of fins discussed. This sleeve is within the evacuated radiating from said electrode, said ñns having envelope. flanges at their ends radially outermost, said lOutside the envelope, directly opposite the flanges extending from one iin to the next and junction of anode and glass parts thereof, is a successively forming a continuous outer cylin metallic shielding ring 22 suspended by hangers 40 drical surface, and a collar surrounding and in 23vsecured thereto and in turn carried by the contact with said surface. heretofore described heat exchange means. As shown, the hangers are in the form of pins the upper ends of which enter certain of the nues 5. A cooling means for an electron discharge device having a metallic electrode as an outside part of an envelope, comprising a collar in surface 20 of the cooling means next the outer- flange of 45 contact with and surrounding said electrode, a the adjacent rln, said’ pins being silver soldered plurality of fins radiating from said collar, said in place or otherwise secured. ‘ fins having flanges at their inner and outer edges, By use of the inner sleeve or shield 2| and the said flanges at the inner edges successively engag outer shield or ring 22, the electro-static ñeld at ing next adjacent lìns and forming a continuous ther junction of glass and metal is made zero or 50 cylindrical surface around said collar, said fins very low and thus the glass at the junction is having flanges at their ends radially outermost, protected from injury which might result other said flanges extending from one ñn to the next wise from the electro-static field. The electric and successively forming a continuous outer cy gradient and the temperature gradient both being lindrical surface, and a collar surrounding and reduced in accordance with my invention the in contact with said out'er cylindrical surface. permanence of the seal between the metallic` 6. A cooling means for an electron discharge electrode and the glass portions of the envelope device having a metallic electrode as an outside has been assured. ' part of an envelope, comprising a collar surround ` Since the various details of construction, as ing a part of said electrode substantially coaxial Well as the precise relation and functioning of 60 therewith and spaced outwardly therefrom, and parts are subject to variation and change without a plurality of ñns extending from said electrode departing from the inventive concept or scope of to said collar, said fins sloping away from radial Ithe invention, it is intended .that all matteì1 con planes intersecting said ñns, each iin having tained in the specification or illustrated in the flanges at the inner and outer edges thereof with drawing, shall be interpreted as exemplary and the flange at the inner edge on the opposite side not in a limiting sense. of the ñn from the flange at the outer edge I claim: whereby said ñn is Z-shape in cross section. 1. In combination, an electron .discharge `de ' HAMPTON J. DAILEY.