US1759865A - Vacuum tube - Google Patents

Description

G. H. PERRYMA'N VACUUM VTUBE:

Filed April 5, 197274 www) i @Il grid respectively Patented May 27, 1930v UNITED STATESIPATENT oil-*FICE GEORGE H. PERBYMAN, 0F WOOIDCL-IFF, NEW JERSEY, ASSIGNOR TO PERRYMAN ELEC- TRIO C0., ING., A CORPORATIONDF DELAWARE VACUUM TUBE Application illed April 5, 1927. Serial No. 181,027.

The object of the present invention is to rovide an improved vacuum or thermionic evice, prticularly adapted for radio purposes. improved tube is so designed as 5 to be readily capable of permitting the heat ing of its cathode by transformed and stepped down alternating current. I achieve, this, without any trace of an A. C. hum, by the manner in which ode heated thereby are isolated fromthe anode and grid leads. Through my improved construction, my improved vacuum tubes may be very expeditiously assembled and furthermore, this assembling is such that an extremely rigid and sturdy construction is provided. y Withthese objects and such other objects as may hereinafter appear, in view, I have devised the particular arrangement of parts hereinafter set forth and more particularly pointed out in the 'claims ap ended hereto.

Reference is to be had to t e accompanying drawing, forming a part hereof in which Figure 1 is a vertical sectional view of a my invention. l

Figure 2 is a sectional view on the line 2-2 of Figure 1, looking in the direction of the arrows,

Figure 3 is a side'elevation of the cathode and attendant parts, with. parts of the cathode beiig broken away to disclose construction an Figure 4 is a view of a modification.

In the embodiment of my invention as disclosed in the accompanying drawing, 1 indicates the lower stem of the tube. This stem 1 is provided with the usual press 2 and formed integral therewith and extending upwardly therefrom is a projection pr stud 3. Extendin stem 4'w ich acts plate 5. Said anode or plate 5 is of the usual tubular form used in many types ofvarious tubes and the same encloses the grid 6. Said grid 6, may be,*'i f desired, composed of a spirally woundrwire and thesame is supported upon an upright wire or stem 7 The - stems 4 and 7 which support the plate and have their lower ends conto support .the anode or `3 on the stem 2, one which is commonlyv the filament and the cath-l similar in ,all respects to vacuum tube constructed in accordance with upwardly from the press 2 is a,

readily apparent.

nected to lead-in wires 8 and 9 which p ass down through the stem 1 and may be connected to prongs of any desired kind mounted on a base which has been omitted for convenience .in illustration.

The structure thus far described is, with the exception of the upwardly projecting stud found in the'ordinary` vacuum tube construction.

At 10 is shown an upper stem which is provided with a press 11 and integrally formed with said press and extending downwardly from4 the same isa stud 12.` rlhis stud 12 is the stud- 3 on the stem 1. At 13 is shown the cathode which is'preferably formed of a section of metall tubular `in form and oxide coated. Said cathode 13 is of such internal diameter that its opposite ends fit snugly over the studs 3 vand 12 and serve to bridge or connect the same as is clearly'illustrated in Figure 1.

The filament leads are disclosed at 14 and l15 and these leads extend downwardly through the stern 10, press 11 and into the internal bore of the tubular cathode 13.

At 16 is shown a spacing member which is vin the form of a continuous elongated rod of such a diameter as to fit with a sliding iit within the tubular cathode 13. Said member 16 is in the nature of a support and 1t is provided with a ing longitudinally through it. These perforations permit the passage vof the filament wires indicated wires extend through the spacing member 16 and are held rigid and secure therein andconnect together at apoint below the end ofthe spacing member 16 as is clearly disclosed in`Figure 1. y f

From the foregoing, the manner in which my improved tube is constructed will be The stem 1 with the anode 5 and grid 6 extending upwardly from it, is assembled in one unit. The upper stem 10 with its parts-composed of the cathode 13, the spacingrod 16 and the filaments 14 and 15 fitted in position as is disclosed in Figure 3, is assembled in another unit. The units thus formed are connected together by simply sliding the cathode 13 down within the grid 'oair o-fperforations extendat 14 and 15. The filament from the press 2. When this is and the same passes up through the press 2 f 2'0 6 so that the open lower end'of said cathode fits over the stud 3 which extends upwardly done, the entire internal arts of the tube have been connected toget er and furthermore, automa,-

tically hold their positions until the tube envelope 17 is fused around them. This is done by first, fusing the stem 10 to one end of the envelope and closing that end and then reversing the tube and fusing the opposite end of the envelope 17 to the stem 1. There- I i after, the tube is exhausted and such bases or terminals as are needed, may be fitted tothe i tube.

I also provide for a cathode lead which automatically establishes connection with the cathode 13 when said cathode is being inserted in position. This cathode lead is shown at 18 and has its upper end terminating in the formof a spring 19. Said'spring part 19 normally tends to bear against the surface ofl the stud 3 and when the cathode 13 is inserted within the anode 5 `and vthe grid 6, and said cathode fits over the stud 3, the end ,of said cathode 13 passes between the lstud 3 and spring 19. Said spring 19 therement wires extend out of one end of the tub-e and the plate and grid leads out of the other with the result that the leads for the filament are spaced away or isolated from the plate i ,and grid leads, sothe possibilityv of an A. C.

. that the lin ,actual use.

Ihum reaching the plate and grid leads is avoided. The filament leads 15 tend, when thenecessary current'is applied, to heat the cathode -13 in a manner readily understood. Caps of an type may be fitted to the opposite ends o the tube and the leads 9, 18 and 8 and the lament leads 14 and 15 maybe connected to prongs on such caps to' enable the tube to be fitted to sockets provided for them. lThelconstruction of the tube'is such parts may be made heavy and strong so that a tube oflong life is provided by the "abilit'y'of the parts of the tubes to withstand shocks and strains either in transportation or In Figure 4' is shown a modification ofmy invention wherein the studs that extend into the-ends of theltubular cathode -13 are separately formed from the stem 1.' lmodification of my invention, thestuds are of metal and fit into the presses 2 and 11. When this type of construction is used, the lower Y New York, this 2nd -Stud which I have' indicated ac eoin Fi ure Having invention, it is obvious that the sameis not to be restricted to the exact embodiment shown, but is broad enough to cover all structures coming claims.

WhatI claimis:

. 1. In a vacuum tube, an envelope,

stem secured" thereto,l a lowerstem, anode and grid leads extending from the lower stem, i

said leads carrying an anode and grid respecf tively, filament leads extending from the' u per stem, a projection formed on and exten ling vfrom the upper stem, a tubular cathode projection and extending.

fitted over said therefrom, said cathode surrounding the filaan upper' within the scope of the annexed ments,` and a projection on -the lower stem v over which the lowerend of fitted. v

2. In a vacuum tube, an envelope, stems fixed thereto, an anode and grid wholly supported by one of said stems,- a filament supported by the other stem, saidffilamentthe cathode is` a pair of A .ica

supporting stem being provided with av rojecting stud, a tubular cathode surroun ing the filament and having one of its ends fitted over said stud and a similar stud on the other stem over lwhich the opposite end -of the cathode is fitted. j

3. In a vacuum tube, an envelope, a stem attached thereto having an integrally formed projecting stud, an anode and a grid carried y said stem, a tubular cathode fitted over said stud and surrounded by the anode and grid, a second stem on the envelope havinga similarly formed stud projecting into the opposite end of the cathode and a filament carried by the second stem and projecting into the cathode. v

Signed at the city, county and State of day of April, 1927. G. H. PERRYMAN.

Inthis.'`

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