US2545759A - Supported electrode metal radio tube - Google Patents

Description

March 20, 1951 A. BINNEWEG, JR

SUPPORTED ELECTRODE METAL RADIO TUBE Filed Nov. 24, 1947 Patented Mar. 20, 1951 SUPPORTED ELECTRODE METAL RADIO TUBE Abraham Binneweg, Jr., Oakland, Calif.

Application November 24, 1947, Serial No. 787,785

' The present invention relates to a radio tube having a metal envelope, ordinarily here used as the anode, and other electrodes within said envelope one or more of which electrodes are supported by both the lead to the electrode and an auxiliary means of support such as a pillar of insulation in which a stiff wire is imbedded for a short distance. If the electrode is made stifi, however, it may not need the auxiliary means of support.

As objects and advantages of this invention:

An object of this invention is to simplify the manufacture of strong. and compact ultra-high radio-frequency radio tubes employing simple means for lead entry and generally a simple construction.

Another object is to provide simple airtight radio tubes having metal envelopes.

An object is to produce better metal'tubes for ultra-high frequencies.

An added object is to provide properly supported electrodes within metal envelopes.

And a combined object is to produce better metal radio tubes for ultra-high radio frequencies having rigid internal support as well as short and direct leads to the outside so reducing capacity between leads and between leads and envelope of the radio tube.

My tube as described and illustrated differs from former tubes in structure and design with electrodes more compactly arranged than in the ordinary tube. Essentially the tube is a shallow metal box with an insulating cover and flattened electrodes, the bottom of the box itself forming the anode. Special inserts in opposite walls for leads make possible a still more compact and eflicient tube with reduced capacity effects.

Fig. 1 is a vertical view of one form of the invention showing bent electrodes supported as shown. 22 is the exhaust tube in Fig. 1.

Fig. 2 is a vertical view of another form of the invention showing the electrode leads entering from opposite sides of the envelope.

Fig. 3 is a vertical view of another form of the invention showing top and side lead entry to the electrodes. The grid is bent in this form of the invention.

Fig. 4 is a vertical view showing both sides as entrances for the leads to the electrodes.

In each of the four drawings as listed above, the electrodes have an auxiliary means of electrode support in addition to the lead that supports the electrode and brings the current to it. It is obvious that, if the electrode leads are very stifi, no auxiliary supports may be needed for any of the electrodes.

2 Claims. (01. 25027.5)

, Fig. 5 is a plan view of a radio tube illustrating the invention. Fig. 1, Fig. 2, Fig. 3, and Fig. 4 have square envelopes as shown in plan view of Fig. 5.

, The entering insulators to any of the radio tubes illustrated, are circular as in perspective view in Fig. 6, which shows a lead sealed in the insulator, or square as in perspective view Fig. '7 which may also have a lead sealed into it as shown for the insulator of Fig. 6.

Fig. 8 is a perspective view of a cathode 4 supported on a lead 5a which is imbedded in an insulating rod 6.

Fig. 9 is a vertical partially sectioned view of a grid electrode such as shown in Fig. 10 perspective view of the same grid without the end bend 24.

Fig. 11 shows a cathode in perspective with a lead attached at its center, while Fig. 12 also shows a cathode in perspective having a lead attached at one end, and also a lead attached to its center which lead may be bent as shown.

- The cathode many of the radio tubes are simple metal cylinders having internal electric heaters which have two external leads l2 and I3. The metal cylinder of the cathode is covered with electron-emitting material as usual.

Fig. 1 shows the metal envelope I, the glass insulator 2 having two leads sealed in it as shown. See Fig. 6 for a sealed lead construction. 3 is a metal ring around and on the glass insulator which ring is sealed by soldering it airtight, to the metal envelope all around. A bent lead supports the grid which is nearest the fiat wall of the envelope, and a rod support 1B also supports the end of the grid 8. Fig. 10' shows the grid 8 with a hole in its end into which the rod is expanded or riveted to hold the grid end. A hole is drilled on the inside of the metal envelope wall, the insulating supporting rod is then driven tightly into this hole. The hole in the end of the grid is fitted over the rod. In Fig. 1, the insulator 6 with metal lead 5a of Fig. 8 is used to support the cathode or cathode lead.

Fig. 2, I a the metal envelope, 2a the top and bottom circular insulators shown in Fig. 6, grid 8 near the wall with bent lead, and cathode 4 near it, also with bent lead. I is a support as in Fig. 1 (insulator 6 of Fig. 8) and 6 is an insulator as in Fig. 8 having a wire 5d (as in Fig. 8) imbedded in an insulating rod. Rings of metal are soldered over on to the metal of the radio tube. Note that in Fig. 2 insulators 2a are smaller than the insulator 2 in Fig. 1. In Fig. 2, metal pieces are welded inside the envelope to reduce the size of the insulator openings. 25 are welds in Fig. 1 and In Fig. 4, the cathode 4 has a side insulator 2b.

and the grid 8 which is the lowest electrode, also has a side insulator 2b.

The heater leads are all brought out the top of the envelopes. Fig. 5 is a plan view showing envelope Id, and insulator 2a in the wall. Grid'fia is supported by insulating pillar 7 andgride-lead;

9. Grid wires II] are shown plainly.

The assembly of this radio tube is asfollows: For example, in Fig. 1, it is necessary to cut an opening '20 in theenvelope, adjust'and arrange the electrodesand insulators, then to weld the opening shut again, care being taken that the welding heat does not damage the insulators by holding that part of the envelope under Water while the welding is being done. In Fig. 5', a hole Zla in the bottom ofthe. envelope showshow easily the assembly is madethrough thehole 2,! a. The hole is then welded closed from the outside of theenvelope.

In Fig. 1, insulators'lb and 6 are first arranged in the envelope, then the assembly consisting of insulator 2 supporting the grid and cathode leads and electrodesis set ,downinto the envelope, and,

sealed airtight such as by solderingthe metallizing of this hard glass to the top rim of the;al1oy metal envelope. Previously, a hole 20, hadbeen burned, or otherwise formed in the bottom of the: Small tools can bepassed through envelope. opening 20 to form a head .onthe end of rodlb to so hold the-grid in place. to the cathode or cathode lead. It is always possible toopen the envelope atone or'more places and'so complete theinternal electrode-assembly;

of these radio tubes.

The metal envelopes are cast or formed of metal materialof a suitable kindsuch asany opening. This insulator has a metallized ring around its outside which rim is soldered to the envelope all around. Fig. 2 isa similarenvelope having top and bottominsulators setin,- ina. similar manner. Fig. 3 .is similar having a top insulator and an, insulator 2b cementedin a holev in; the sideof the envelope. Fig. 4. has :two in:

5a is also Welded 4 l sulators 25 set in, one on each side, like the insulator 2b of Fig. 3.

Fig. 5 shows a grid mounted on an insulating peg for additional support over the metal base. Circular grids or anodes are supported also on insulating supports as illustrated.

The present design gives the heat generated a large area for dissipation. Leads are short and direct with very high frequency operation. En-

. velopes have a flat area near the grid.

I claim:

1'. A radio tube comprising a shallow metallic receptacle, the bottom of which constitutes an anode, an insulating cover for said receptacle rendering it air-tight, insulating inserts in opposite Walls-.cf said-receptacle, a flattened grid above the .bottom of said receptacle and parallel thereto, a stiff lead attached to one end of said grid and passing through one of said inserts, a short insulating pegattached' to the bottomof said receptacle and supporting the other end of said grid, a cathode parallel to the cover ofsaidreceptacle, a cathode lead passing through the other of said insertsand filament 'leads'passing' from said cathodethrough the cover of said tube. 2. A radio tube'comprising a shallow-metallicreceptacle, the. bottom of which constitutes an anode, an insulating cover for said receptacle rendering it air-tight, insulating inserts in 01)- posite walls of said receptacle, a flattened grid above the bottom of said receptacle and parallel thereto, a stiff lead attached to oneend of'said' grid and'passing through one of said inserts, a

short insulating peg attached to the bottomof' said receptacle and supporting the other endof said grid, a cathode parallelto thecover of said receptacle, a cathode, lead passing throughthe other of said inserts, filamentleadspassing from said. cathode through the, cover ofsaidtube, and

a metalring encircling the insulatingcoverand,

overlapping the lip of said metal receptacle and soldered thereto.

ABRAHAM'BINNEWEG, JR.

REFERENCES. CITED The following references are of recorcl'in the file ofthis patent:

UNITED STATES 1 PATENTS Number. Name Date.

1,716,930 Prindle June 11, 1929 1,906,458 Franklin ,May 2, 1933 2,000,567 McCullough May 7, 1935-. 2,150,379 Kerschbaum May 14, 1939- 2,163,409 Pulfrich June 20, ,1939. 2,165,135 Garner July 1,1939 2,229,957 Crawford Jan..28,.1941

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