US1911989A

US1911989A - Variable condenser

Info

Publication number: US1911989A
Application number: US556888A
Authority: US
Inventors: Cohen Samuel
Original assignee: Arris Technology Inc
Current assignee: Arris Technology Inc
Priority date: 1931-08-13
Filing date: 1931-08-13
Publication date: 1933-05-30
Anticipated expiration: 1950-05-30

Description

S. COHEN VARIABLE CONDENSER May 3o, 1933..

Filed Aug. 15, 1931 2 Sheets-Sheet 2 JNVENToR. 61" 5am/wwf @of/zw,

BY W e, ATTORNEY Patented May 30, 1933 UNITED STA TEs PATENT OFFICE .SAMUEL COHEN, OF BROOKLYN, NEW YORK, AS\SIGNOR TO GENERAL INSTRUHENT CORPORATION, OF NEW YORK, N. Y., .AI CORPORATION OF NEW YORK 'VARIBLE coNDENsER Application led August 13, 1931. Serial No. 556,888.

My invention relates broadly to electrical condensers and more particularly to the construction of multiple variable electrical condensers having meansfor compactly I mounting a compensating or trimmer condenser adjacent each of the sets of rotor and stator plates in the multiple variable condenser.

One of the objects of my invention is toy pensating condenser individual to each of' the Avariable capacity units constituting the multiple variable condenser;

Still another object of my invention is to provide a compact construction of multiple variable condenser including 'a chassis arranged to support a multiplicity of variable 80 condenser units, the side walls of the chassis having a portion thereof offset one from aliother for providing mounting means for a compensating condenser adjacent each of the variable condenser units, the compensating ai condensers being so mounted that the parts thereof areentirely shielded by laterally extending electrostatic shields forming part of t e condenser chassis.

A further object -of-my invention is to l4:0 provide a construction of multiple variable condenser, having a chassis with opposite side walls wherein diametrically oppositev apertures are"A arranged in the side walls and integrally connected tongues projected upwardly from the bottom of the chassis into -a planeparallel with the plane of the side walls but offset therefrom for a distance ich lies withinthe lane o the si e walls 5 and forms an insulate suspension means for the stator plate units and for the compensating condenser units.

Other and further objects of ymy invention reside in the compact construction of a multiple variable condenser-as set forth vmore e fully in the specification hereinafter following by reference to the accompanying drawings;- in which:

Figure 1 is a side elevation of the multiple variable condenser structure of my inven- .Q0 tion; Fig. 2 is a plan view showing the arrangement of parts of the multiple variable condenser shown in Fi 1; Fig. 3 is another side elevation of t e multiple variable condensertaken from a position opposite to that at which the view 1n Fig. 1 is taken; Fig. 4 is allateral cross-sectional view taken through the condenser on line 4--4 of Fig.

2; and. Fig. 5` -is a fragmentary sectional view taken through the condenser lon line 5--5 of Fig. l. f

Referring to the drawings in detail, the condenser chassis is indicated at 5 havingl a bottom portion and upstanding side wall e portions. There are a plurality of plate-: members extending laterally of the condenser chassis such as represented by

reference characters

1, 2, 3 and 4.. Plates 1 vand 4 constitute end plates for the condenser chassis while

plates

2 and 3 constitute elec-- trostatic shields disposed'intermediate the sets of rotor andstator plates constituting each of the variable condenser units. A rotatable shaft 6 extends through the

electrostatic shields

2 and 3 and is journled in the

v end plates

1 and 4, the journals being represented similarly at la and 4a in the

end plates

1 and 4, respectively. The rotatable shaft 64 carries sleeve members 7, 8 and 9 which are grooved to support `sets of rotor plates represented at 20, 21 and 22. The sets of rotorplates are aligned t0 be interleaved with the sets of

stator plates

10, 11 and 12. IThe stator plates are arranged-laterally of the chassis and supported by means at each side thereof in the form of sets of insulated

vpanel members

23, 24 and 5 25, as shown. The side walls ofthe con denser chassis are represented at and 5b.

The-se `side twalls are provided with dia- 10' metrically opposite apertures 50 therein. These apertures are partially closed by an upstanding tongue 5d which is bent fromk ldistance equal to the thickness of the side wall. The tongue 5d serves as a carrier for the associated insulated panel member.

As shown in Fig.l 4 the. insulated panel 23 is riveted at v23a to the upstanding portion of 5d. The panel 33 projects upwardly and substantially fills the space provided by the aperture 5c in the side wall of the condenser chassis. The insulated panel 23 is apertured adjacent the to thereof for the passage of screws 26 which pass through the insulated panel and through the chalinel shaped member 27 and are secured in position by means of nuts 28. The channel shaped member 27 thereon has diametrically opposite supports for the edges of the sets of

stator plates

10, 11 and 12, arranged in such position that the rotor lates may be interleaved therewith. yIn or ery to provide for connection to the sets of stator plates, lugs 26a: may be secured under the heads of screws 26 at one side of the condenser chassis. At the other side of the condenser chassis I provide a mounting for the compensating condenser for each condenser unit. Thek compensating condenser is constituted by a plate member 29 throu h which screws 26 lpass for mechanical y mounting the plate member 29 and estab-y lishing electrical connection between plate member 29v and the sets of stator plates. The plate member 29 has a ca acity area at ,the upper portion thereof w ich lies immediately adjacent the upper portion of the side wall 5b. An aperture is provided in the upper portion ofiplate 29 for the passage of an adjusting screw 30 which enters the side wall 5b and is adjustable against plate 29 for varying the spacial relation between plate 29 and the side wall 5b. A dielectric sheet as shown at 31 extends between the plate 29 andthe side wall 5b and is supported by laterally projecting tongues 29a on plate 29 as well as by means of adjusting screw 30. Plate 29 has sufficient resiliency to normall tend to force plate 29 away from the side wall of the condenser. However by turning adjusting screw 30 thei creasing the ca aeity of the compensating condenser. Adjustment of the compensatingcondenser permits the maximum to minimum capacity ratio of each condenser section to be fixed thereby' enabling the condenser to be efiiciently matched with the tuning circuit inwhich it is employed in an adjustably tuned amplifier system. Electrical connection is established with plate .29 of the compensating condenser and with the -associated stator plates with the projecting lug 29?), arranged as illustrated. The fact that plate 29 is directly connected with the stator plates, places the compensatingcondenser effectively in shunt with each condenser unitl inasmuch as the sets of rotor plates are connected to the condenser frame of which the side 5b-is an integral part.

It will be observed that the insulated panel members are so supported by the upstanding tongues 5b that they lie in the plane of the side wall of the condenser chassis. This arrangement is possible because of the arrangement of the tongues 5d which have their exterior surfaces extending in a plane coincident with the plane of the interiorsurfacesv of the side walls of the. condenser chassis. The insulated panel member has a thickness substantially equal to the thickness of'the wall of the condenser chassis and so occupies a space substantially within the limits of the thickest dimensions of the side walls. The mounting of the compensating condenser is in this way arrangedfso compactly that all parts of the compensating, condenser lie between the adjacent electrostatic shields'and closely conform with the lateral dimensions of the condenser. This facilitates quantity production of condensers in manufacture and simplifies assembly, installation and wirin of the condenser in circuit with the amplifier system.

While I have described my invention in i one of its preferred embodiments I desire that it be understood that modifications may be made and that no limitations upon my invention are intended other than are imposed bythe' scope of the appended claims.

What I claim as new and desire to secure by Letters Patent in the United States is as follows:

1. Ina multiple variable condenser, a condenser chassis having a bottom portion and .upstanding side wall portions, said side wall portions being apertured in diametrically opposite positions, tongues integrally connected with the bottom of said chassis extending vertically therefrom in a plane inwardly offset fromvthe plane of the side wall of said chassis for a distance equal to the thickness of the sidewall portions of spacial relation between plate 29 and thellaterally of said chassis, insulated means side wall 5b may be decreased thereby insupportedv by opposite tongues and conf/wal nected with opposite ends of said stator plates and extending in the plane of the side wall portions of said chassis for suspend- -ing said stator plates laterally of said chassis, anda trimmer condenser plate carried by said insulated means in coacting relation to the side wall'of said chassisl 2. In a multiple variable condenser, a condenser chassis having a bottom portion and l0 upstanding side wall portions, said side wall portions being apertured in diametrically l opposite positions,ytongues .integrally connected with the bottom of said chassis extending vertically therefrom," said tongues being disposed in a plane parallel to the plane of said side walls but inside the limits of said'side walls with the outside face of said tongues dis osed in a plane coinciding with the plane o the inside face of said side Wall portions, an insulated plate connected with each of said tongues and extending vertically in a position filling the apertures in said sidewalls, sets of stator plates suspended between opposite insulated lates in a position adapted to be interleave by sets of rotor plates adjustably mounted with respect thereto, and a trimmer condenser p ate carried by said insulated means in coaoting relation to the side Wall of said chassis.

3. In a multiple variable condenser comprising, a condenser chassis and including a bottom portion and a pair of opposite side wall portions, the side wall portions being apertured .at opposite positions, tongues integrally connected with said bottom portion and extending vertically upwardly therefrom to a position within the apertures in said side walls, the exterior surface of said 40 tongues extending in a plane coincident with the lane of the interior surface of the side lp of said condenser chassis, an insulated plate attached at its lower end to each of said tongues, laterally extending sets of stator plates within said condenser chassis and connections, ybetween opposite ends of said stator plates andthe upper portions of said insulated plates for suspending said stator plates, a compensating condenser having an adjustable plate supported by each i of said insulated lates and coacting with said side wall portions, and a rotatable shaft journaled in said condenser chassis and carr ing `a lurality of sets of rotor plates t ereon a apted to be interleaved with said sets of stator plates. i

4. In a multiple variable condenser a condenser chassis comprising a bottom portion and vertically extending sidewall portions sets of stator plates extending laterally of said chassis, a rotor shaft journaled in said chassis sets of rotor plates carried by said rotor sliaft and adapted to be variably interleaved with said stator plates, said side 95 wall portions being cut to form apertures aligned with opposite ends of said stator plates and tongues integrally connected at tothe thickness of the wall of said chassis,

and means extending through said panels for suspending the said sets of stator plates from the opposite ends thereof, and a compensating condenser having an adjustable plate supported from certain of said insulated panels and coacting with the side wall portion of said chassis.

In testimony whereof, I aiiix my signature.

SAMUEL COHEN.