US2445256A

US2445256A - Filament by-pass condenser

Info

Publication number: US2445256A
Application number: US456044A
Authority: US
Inventors: Robert M Page; Merril F Distad
Original assignee: Individual
Current assignee: Individual
Priority date: 1942-08-25
Filing date: 1942-08-25
Publication date: 1948-07-13
Anticipated expiration: 1965-07-13

Description

July 13, R, M PAGE ET AL 2,445,256

FILAMENT BYPAS S CONDENSER Filed Aug. 25, 1942 2 Sheets-Sheet 1 l-l- L 1v1/uvm Robert M. page Merril E Dstad July 13, 1948- R. M. PAGE ET Al. 2,445,256

FILAMENT BYPASS CONDENSER Filed Aug. 25, 1942 2 Sheets-Sheet 2 Eli-:1E

SWW/whew Robert,A M. Page Merril, E Disad Patented July 13, 1948 FILAMENT BY-PASS CONDENSER Robert M. Page, Washington, D. o., and Merril F. Distad, Cheverly, Md.

Application August 25, 1942, Serial No. 456,044

(Cl. Z50- 16) (Granted under the act of March 3, 1883, as amended April 30, 1928; 370 O. G. 757) 6 Claims.

This invention relates to a filament bypass condenser assembly especially suited for use with high voltage -oscillator tubes mounted in a ring.

Under circtunstances which require the generation of pulses of high frequency oscillations at high power levels it has been found advantageous to employ a number of oscillator tubes in a ring mounting using iilament frames for coupling to a concentric transmission line which couples in turn to 'the antenna. Such a construction is disclosed in the application oi R. M. Page etal., Ser. No. 456,045, filed August 25, 1942, for Oscillators.

With such a construction it is desirable to employ the filament frames as conduits for the filament leads and to provide a compact rugged bypass condenser assembly between the filament leads and between the leads and the ends of the frames adjacent the oscillator tubes. It is an object of -this invention to provide a bypass condenser meeting -the above requirements.

It is a further object of this invention to pro- Vide a bypass condenser assembly which will constitute a unita-ry compact rigid assembly providing bypass capacity between the two lament leads and an oscillator tube and between each of said leads and the filament frame associated therewith.

It is another object of this invention to provide such an assembly which will also act as a supporting and mounting means for the oscillator tube associated therewith.

It is still another object of this invention to provide such an assembly which will act as a rigid mechanical connecting means between an oscillator tube and a lament frame associated therewith.

It is a still further object of this invention to provide such an assembly which will possess a shape adapting it for incorporation `into a ring mounted multiple tube oscillator intended for operation at high voltages. It is still another object of this invention to provide such assembly which, when incorporated into a ringmounted multiple tube oscillator, will lend itself readily to tuning by a butterfly type tuning means common .to all the assemblies in the oscillator.

Other objects of the invention will become apparent from a careful consideration of the following description when taken together with the accompanying drawings in which:

Fig. l is an elevational view taken partly in section along the line I-I of Fig.2 showing thev 2 :bypass condenser assembly embodying the invention;

Fig. 2 is `a .plan view of the assembly at Fig. 1;

Fig. 3 is a plan view of one of .the intermediate ycondenser plates of the assembly;

Fig. 4 is a cross-sectional view of the assembly shown in Fig. 2 taken along the line 'I-1;

Fig. 5 is an elevational view taken partly in section along the line 5-5 of Fig. 6 showing a second embodiment of the invention;

Fig. 6 is a plan view of the assembly shown in Fig. 5, and

Fig. '7 is a ,plan View of a portion of a ring mounted multiple tube oscillator unit showing four of the condenser assemblies as they would be mounted in such a unit and showing a buttery type tuning vane positioned for use therewith.

Referring now to the embodiment of the invention shown in Figs. 1 to 4, reference character I0 indicates a tubular filament frame adapted for use as a coupling means between the lament of an oscillator tube of a ring mounted multiple tube oscillator and a transmission line coupled to an antenna. The employment of a lament frame for this purpose is disclosed in the above mentioned application of Page et al. Soldered or welded inside the upper end of the filament frame and ilush therewith is a conducting disk I I. The -condenser assembly proper is comprised of an upper condenser lplate I 2 anda lower condenser plate I3 having identic-al configuration which is more readily seen in Fig. 2. These plates form a portion of a stacked condenser which includes two intermediate plates I4 and I5, all the plates being separated one from the other by disks of dielectric material indicated at I6, I'I and I8. The condenser plates I4 and I5 and the dielectric disks I6, I1 and I8 are circular in shape as indicated in Fig. 3, the disks of dielectric material being suciently larger in diameter than the circular condenser plates to aioi'd protection against flashover lat high voltages. For this purpos-e `also the edges of the condenser plates are rounded. The condenser when assembled in an oscillator is usually mounted on a disc-like supporting member of insulating material such as indicated at I9. The condenser rests on top of this disc and the lament frame I0 extends downwardly through a hole bored for that purpose. The condenser is bound tightly together and rigidly held on the disc I9 by means of a pair of bolts 2l) which are tapped into the lower plate I3. The condenser is rigidly mounted on the lament frame I0 with the axis of the frame extending normal to the lateral surfaces oi the `from to avoid ilashover.

.tor 2li for the same purpose.

condenser plates by means of a screw-headed bolt 2I extending through both upper and lower condenser plates and being tapped into disk Il. The head of this bolt is counter-sunk into the plate I2 to avoid .projecting points or ridges. A spacing cylinder 22, preferably Iof a dielectric material surrounds the bolt 2|.

The oscillator tube associated with this condenser assembly is intended to be mounted directly on the assembly and to be supported at least partially thereby. Such tubes areprovided with a pair of downwardly directed filament terminals such as shown in Fig. 1 at 23'and 42li. These terminals are received in a pair of

pin vise connectors

25 and 26 which arein turn conductively attached to a pair of downwardly extending

lugs

21 and 23, the lug 21 having a tapped connection to the condenser plate I4 and the lug28 having a similar connection tocondenser plate l5. These lugs extend downwardly through the supporting plate I9 and terminate below it in terminal posts 2S and 3D to which the ends oi .filament leads SI and 32 are secured. Aiter leaving the termina-l posts the |leads .3l and 32 enter the filament frame IQ through a hole formed `near theupper end thereof andcontinue downwardly throughout its length.

The top condenser plate I2 of the stack has a .cutaway portion indicated at'll surrounding the pin vise connectors and spaced far enough thererlhe condenser plate i4 is also provided with a cut-out portion li surrounding the location of the'pin vise connec- -Where the lugs 2l and-28 pass through condenser platesfrom which they are required to be insulated, insulating washers such as that indicated at l2 areprovided. In all cases the disks oi dielectric material posi- .tioned between the condenser plates are ex- `respectively, which portions terminate in those condense` "lates, The filament leadsSI and 32 soldered to the condenser plates Iii and I5' respectively as indicated at ill and t5 and-then passed through a hole d5 iormed in the lower vcondenser,plate and located above the upper end of the filament frame l. The lament leads then continue downwardly through .the illament Aframe as before.

In ythis form of the invention the condenser .assembly is attached to the filament frame by means oi .the screw-headed bolt 2/I which is tapped into a block i soldered or welded .into the top of the filamenti-rame l which block is of a size toiallow the leads 3| `and 32 to pass-by itintofthe frame. The spacer member 22 is semi cylindrical in form for ythe same purpose. The condenser stack is secured into a unit and se- .curely held to the insulating supporting disk 'it yby bolts 2G as before.

Fig. 1i shows'a cross-section of `the condenser assembly'talen along the line l-l of Eig..2'but which could equally well have been taken from a condenser assembly of the type shown in Figs. 5 and 6. This view indicatesthe manner in which the -bolts 20 are lead through .the `top .and bottom ttrude.

. assemblies.

'central hole indicated at 48 over which the tapered ends of the condenser assemblies pro- The amount of protrusion is suicient so that the filament frames attached to each of the 'assemblies may pass downwardly through a hole sufliciently removed from its edge to prevent lashoven 'Centrally positioned about the hole is a butterfly tuning vane 50 having four identical armseachunderlying an-identical portion of the vtop .condenser plate I2 of one of the condenser Movement of the tuning vane 50 about its axis 5I thus simultaneously tunes all the assemblies.

It willbe seen that applicants have contributed to lthe art a condenser assembly which is admirably yadapted to use in multiple tube ring mounted oscillators employing lament frames for coupling purposes and which possesses a number of outstandingadvantages for this use. The frame -is compact and rugged, amply protected fromsflashover at high voltages, provldessupport for an electronic tube, lends itself to firm connection to a filamentframe and to gang tuning by means of Aa butterfly type tuning vane and, by virtue of its coniiguration, is adapted to the multiplemountingof oscillator tubes in the minimum amount .of space.

It should be understood that the practice of the invention is not limited to the embodiments illustrated anddescribed but is circumscribed only by the scope and limitations-'of the appended claims.

The invention described herein may be manu-- factured and used by or for the Government of the United States-of America `for governmental purposes without the payment of Aany royalties thereon or therefor.

We claim:

l. In combination, apairof conductors consti- .tuting'thelament leads of an oscillator tube, a tubular conducting member surrounding said conductors for a portion of their length and insulated therefrom, said conducting member forming transmission means for coupling the radio irequencyoutput'of` said-tube to an antenna feed line, and means forming a radio frequency bypass between said conductors and between each of said conductors and saidconductingmember, saidmeans comprising a stack of four condenser plates, dielectric material separating said plates, means rigidly and conductively connecting the two outermost of said plates to one end of said conducting member, means conductively connecting each of said conductors to a separate one of theintermediateplates of said stack, and means insulating each of said conductors from the remainder of'said plates.

2. In combination for'use in a multiple tube oscillator, a pair of conductors constituting the being insulated therefrom and means forming a radio frequency bypass between said conductors and between each of said conductors and said conducting member, said means comprising a stack of four condenser plates, dielectric material separating said platesmeans rigidly and conductively connecting the two outermost of said plates together and to one end of said conducting member to form a unitary assembly with the axis of said conducting member extending normal to the lateral surfaces of said plates, said conductors extending into said stack in parallelism to said axis, means rigidly and conductively connecting each of said conductors to a separate one of the intermediate plates of said stack, and means insulating each of said conductors from the remainder of said plates.

3. A condenser constituting a rigid mechanical interconnection between an electronic tube and a filament frame encasing the lament leads of said tube for a portion of their length, said condenser serving as a rigid mounting and supporting means for said tube and providing a radio frequency bypass means between said filament leads and between each of said leads and said frame, said condenser comprising a stack of four condenser plates, dielectric means separating said plates, means binding said stack into a unitary assembly, means rigidly and conductively connecting the two outermost of said plates together and to one end of said frame with the axis of said frame extending substantially normal to the lateral surface of said condenser plates, means rigidly connecting each of the filament terminals of said tube to a separate one of the intermediate plates of said stack, and means connecting each of said iilament leads to a separate one of said intermediate plates.

4. A condenser comprising a stack of condenser plates, dielectric means separating said plates, the intermediate ones of said plates being symmetrically shaped, the two outermost of said plates each having a portion of similar shape to that of said intermediate plates and being 4formed with a co-planar tongue-like portion extending rigidly therefrom, means clamping said stack together into a unitary assembly, a plurality of rigid conductors extending through said stack in mutual parallelism, means conductively connecting each of said conductors to a separate one of said intermediate plates, means insulating said conductors from the remainder of said condenser said conductors having means formed at their exposed ends to receive and rigidly hold the terminal pins of an electronic tube, and means conductively and rigidly connecting said tongue-like portions of said outermost plates.

5. A condenser comprising a stack of condenser plates, dielectric means separating said plates, the intermediate ones of said plates being symmetrically shaped, the two outermost of said plates each having a portion of similar shape to that of said intermediate plates and being formed with a co-planar tongue-like portion extending rigidly therefrom, means clamping said stack together into a unitary assembly, a plurality of conducting rods extending through said stack in mutual parallelism, each of said rods being tapped into one of said intermediate plates, means insulating said rods from the remainder of said condenser, terminal connection means formed on both ends of each of said rods, the terminal connection means at an adjacent end of each of said rods being formed to receive and rigidly hold the terminal pins of an electronic tube whereby said condenser rigidly supports said tube on an axis normal to the lateral surface of said condenser plates, and means conductively and rigidly connecting said tongue-like portions of said outermost plates.

6. A condenser comprising a stack of condenser plates, dielectric means separating said plates, the intermediate ones of said plates being symmetrically shaped, the two outermost of said plates each having a portion of similar shape to that of said intermediate plates and being formed with a co-planar tongue-like portion extending rigidly therefrom, means clamping said stack together into a unitary assembly, a terminal connection means formed on each of said intermediate plates and extending outwardly therefrom through said stack, said connection means being insulated from the remainder of said condenser said connection means being so formed as to receiVe and rigidly hold the terminal pins of an electronic tube, whereby said condenser rigidly supports said tube on an axis normal to the lateral surface of said condenser plates, and means conductively and rigidly connecting said tonguelike portions oi said outermost plates.

ROBERT M. PAGE. MERRIL F. DISTAD.

REFERENCE S CIT ED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,588,438 Bliss June 15, 1926 2,205,852 Hollmann June 25, 1940 2,216,176 Hollmann Oct. 1, 1940