US1597893A - Radiotube - Google Patents

Description

Aug. 31, 1926.

H. K. HUPPERT RADIOTUBE INVENTOR.

H LIF P ER T HENRY k BY ATTORNEY Patented Aug. 31, 1926.

, v I 1,597,393" UNITED STATES PATENT OFFICE.

HENRY K. HUIPPERT, OF SAN FRANCISCO, CALIFORNIA.

RADIOTUBE.

Application filed June 11, 1924. Serial No. 719,440.

This invention relates to improvements in radio tubes.

The principal object of this invention is to provide means for greater control of the electronic flow. 7

Another object is to provide a tube wherein alternating current may be employed for .the lighting of the filaments.

A still further object is to provide a tube having a greater plate surface.

Another object is to provide a double filath like numerals are employed to designate like parts throughout the same z- Figure 1 1s a vertical cross section of a tube constructed in accordance-with my invention,

Figure 2 is a cross section of the tube taken on the line 22 of Figure 1,

Figure 3 is a bottom plan view of the tube,

Figure 4 is a diagrammatic arrangement showing the employment of a transformer employing alternating current for lighting the filaments,

Figure 5 discloses a diagrammatic arrangement of the standard form of filament, disclosing the electronic losses, and

Figure 6 is. a detail perspective View showing one-half of my improved plate construction.

Radio tubes employ a heated filament for the purpose of causing an electron flow and up to the present time, as far as applicant 1S aware of, it has been impossible to satisfactorily employ alternating current for heating filaments without the use of external apparatus, due to the fact that a decided hum would be produced by an alternating current and amplified in the customary manner by the action of the tube. Applicant has devised a tube which permits the use of an alternating current without the objectionable features referred to and also receives greater electron control and by re ferring to the drawings it will be noted that the numeral 5 designates the customar glass bulb and the numeral 6 the metal base adapted to support the bulb. The base is held to the bulb by a plastic composition as shown at- .7, while a porcelain insulator 8 is held within the base b This base supports four prongs designated at 11, which prongs-are customary in all which the elements of the tube are connected.

A support 12 is sealed to the base of the tube 5 which has mounted therein the tube elements. It is, of course, understood that e tube is evacuated in the usual manner.

y an annular ring 9;

These prongs form the leads to Referring to Figure 6, it will be noted that I sists of two semi-circular plates 14 and b referring to Figure 2, it will be noted that two of these plates are employed the same The wire 16 has a lead 18 connected thereto, which lead extends downwardly and is connected to one of the prongs 11.

ounted within the barrels are grids 19 23, respectively. The lower end of the rod 22 being bent downwardly and sealed in the support 12. The rod 23 is also sealed in the support 12 and is connected by a lead 24.- to one of the prongs 11.

At 26, I have shown a U-shaped wire con- 21. Filaments 27 and 28 are arranged so as to extend throughout the length of the grids 19 and 21, respectively, which filaments have their upper extremities supported by a Y 29, which Y is, in turn, mounted upon a rod 31 extending downwardly into the support 12. This rod is connected by a lead 32 to the he lower extremity of the filaments 27 and 28 are connected to wires 33 and 34., respectively, which wires are sealed to the support 12 and are connected by th leads 36 and 37 to the remaining prongs 11.

The structure thus described completes the structure of my improved tube. By referring to Figure 4, I have diagrammatiy cally represented the filaments of the tube at have provided a plate 13 which con ary F of a transformer and to the neutral point G I connect a lead H. At I, I'have shown an electrical connection between C and H, which connects the zero potential point of the transformer to, the zero potential of the filament.

The purpose of the conductor I is two fold. In the first. place should one of the filaments, either A or"B burn out, the conductor I will form the return lead. Also the conductor may be considered as being used in place of a potentiometer and acts as the same in conjunction with the received si nal, thereby eliminatin the 'A-C Be present.

hum, which would, otherwise, Experiments have proventh'at when the conductor I is severed a hum immediately commences in the circuit. I

At J I have shown the ,primary of a transformer which receives its energy from any suitable alternating source of electrical current. It ispossibleto secure greater electron control, thanis possible with the usual forms of tube having the hair-pin filament, because in my tube the filaments are entirely surrounded by a grid and a plate, a condition which does not exist in the usual form of tube and by referring to Figure 5 it will be noted that there is no plate or grid to entirely surround the filaments, therefore space between the dotted lines represents a loss and by referring to Figure 5 it will be seen that this space comprises a considerable area, substantially the area. between the points CD and A- B, therefore,

it will easilybe seen that it is impossible to control electronic action between the dotted lines of Figure 5, while with the double barrel construction the plates en tirely surround the grid and the filaments, with the resulting increased efiiciency.

It is possible with my tube to short the two prongs 11 to which the filament leads are connected and use the shell for the return of-vthe current, with the result that the tube will function on one-half the voltage that is required when the filaments are forth.

that '1 have devised a.

in series, an increased electron emission will It is to be understood that theform of my invention herewith shown and described is to be taken as a preferred example of the same, and that various changes in the shape, s1ze and arrangement ofparts may be resorted to without departing from the spirit of .the invention or the scope of the subjoined claim.

Having thus described my invention, I claim A radio tube comprising a base, a bulb mounted on said base, a support mounted in said bulb, a plurality of'prongs secured to said base, leads extending from said prongs and said base and terminating in said sup- 'port, a plate mounted on said support, said plate being shaped so, as to form two parallel barrel-shaped structures, means for electrically connecting said plate to one of said leads in said support, a grid centrally positioned in each of said barrels and mounted above said support, means for conture.

. HENRY K. HUPPERT.

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