US1815390A - Rectifier - Google Patents

Description

F. A. YOUNG i HECTIFIER Filed April '7, 1925 Patented lJuly 21, 1931 UNITED STATES PATENT OFFICE FRANK A. YOUNG, OF MERIDEN, CONNECTICUT, .ASSIGNOR, BY MESNE ASSIGNMENTS, '.lO RADIO INVENTIONS, INC., OF NEW YORK, N. Y., A CORPORATION OF NEW YORK RECTII'IER Application led April 7, 1926. Serial No. 100,266.

My invention relates` particularl to what are commonly termed cold catho e devices depending upon difference in area of the anode and cathode.

The main object is to provide a simple, durable and reliable device which can be commercially made.

Another object Iis to provide a device wlch will operate uniformly and enconomica v Aiiother object is to provide an eiiicient and durable device for full wave rectification.

In the preferrerd form, the device has two anodes and a single cathode, all insulated from each other but mechanically inter-connected so as to reinforce each other.

Fig. 1 is an end view of the device with the tube being shown in cross-section.

30 Fig. 2 is a longitudinal sectional view and side elevation.

Fig. 3 is a perspective view showing the various internal parts.

The envelope or container 5 may be of any suitable material, such as glass of any suitable shape.

The circuit terminals or conductors 6, 7, and 8 are brought out through a pressed stem or press 9. The cathode elements 10 is preferably supported at opposite sides by the conductor 6 and a supplemental supporting rod 11 which is mounted in the press 9. The anodes 12 and 13 are comparatively small in area and located with respect to the cathode surfaces so as to permit a predominating one-way ionization. The anodes are spaced apart at all points of the cathode surfaces, a sufficient distance to permit ionization to take place. The anodes are 4o preferably of graphite, supported in sockets 14 which are mounted on the ends of pins 15, which, in turn, are connected to the terminal by a sealing-in wire 16. For convenience in manufacture, the lower end of the anode may be nickel plated at 17 and then welded or soldered in the upper end of the tube 14. IThe lower end of the tube 14 is soldered or welded to the upper end of the pin 15. The tube 18 is of glass and surrounds the tubular 5o portion 14 of the anodev base and itself is sealed into contact with the upper end of the press 9. Around the u per end of the glass tubes 18 and the anodelbase, I mount an insulator 19 for preventing the transference of heat back to the press.

The two anodes and the cathode are braced with respect to each other and with respect to the press 9 by a reinforcing plate 20. This plate has lugs 21 which are welded to .the supports 6 and`11. Additional bracing members 22 may be welded to the cathode 10 and the plate 20. The plate 20 is also preferably provided with raised bosses 23 which provide recesses beneath to receive the upper ends of the insulators 19. In this way the in sulators are braced with respect to the plate 20 and the plate 20 is held bythe posts 6 and l1, thus affording a four-point support for the plate 20. The plate 2O is provided with passages-24for the anodes. The insulators` are preferably provided with flanges 25 so as to leave a space beneath the boss 23 for the l collection of material adjacent the edge of the opening 24 which might otherwise shortcircuit the device.

The parts are made as light as practical not only to conserve material and save eX- pense but also to prolongv the life of the parts which are likely to be broken by impact and inertia ifthey are made too heavy. It is also desirable to separate the parts as much as possible to bring a maximum cooling effect by radiation as well as convection.

Although I do not wish to. be limited to the particular materials specified, I might state that I have found good results can be attained by the use of nickel for the cathode l0, steel for the plate 20, lava forthe insulator 19, graphite for the anodes, nickel for the tube 14 and pin 15,.and glass for the insulating tube 18. After the parts have been assembled, the tube is evacuated and an atmosphere of an inert gas, such as neon, is preferably provided. The pressure of this gas may be equal to one and one-half centi-` meters of mercury. It should be understood, however, that I do notV consider the invention as limited to this pressure or to that particular gas.

I claim:

1. A rectifier comprising an envelope having a press, a wire sealed in said press, a metallic tube secured on said wire, an insulator on said tube, and a aphite anode with a plated base secured 1n said tube and a cathode adjacent to said anode.

2. A rectifier comprising an envelope containing a Wire, a metallic tube secured on said wire, lava and glass insulators on said tube, and a graphite anode with a plated base secured in said tube and a cathode adjacent to the anode.

FRANK A. YOUNG.

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