US1838264A

US1838264A - Radio apparatus

Info

Publication number: US1838264A
Application number: US373991A
Authority: US
Inventors: Kerrigan John
Original assignee: Westinghouse Electric and Manufacturing Co
Current assignee: CBS Corp
Priority date: 1929-06-27
Filing date: 1929-06-27
Publication date: 1931-12-29
Anticipated expiration: 1948-12-29

Description

Dec. 29, 1931. J, KERRIGAN 1,838,264

RADIO APPARATUS Filed June 27, 1929 2o ..15 J6 J5 32 s.

INVENTOR 5.71 /f/-z' an,

, ATTORNEY back-lash is prevented iromdeveloping.

Patented Dec, 2Q, ldt

stares PATENT @FFEQE 50H23' KEERIGAN, 0F SPRINGFEZD, MIASSACHIUSETTS, SSIGNOR T0 WESTING'HOUSE MESTRE@ da MMUFAOTUEING CUMPANY, A. CORPORATION 0F PENNSYLVANIA BABE@ APPARATUS Application died June Si?,

My invention relates to radio apparatus and it has particular relation toy controldevicesA for the'tuning reactors comprised in radio receiving sets.

lin the construction of modern radio receivingV sets, it has been found expedient to abandon the former custom oi mounting the indicating dials of the tuning reactors eXteriorlyof the cabinet containing the re cei'ving apparatus and, instead, t0 so dispose the dials rearwardly of the front panel of the cabinet that minor portions thereof are visible through openings in that anel. it is also novv customary, as exempliied by a receiving set known as Radiola 17, sold by theltadio vCorporation of America, to associate a yplurality of tuning reactors with a single indicating dial of the type referred to and, in addition, to provide a single, eltteriorly disposed, adjusting device that is connected, by a phosphor-bronze cable or the like, to a shaft common to' said reactors for adjustment thereof. A v

ldhen a receiving set having a cable, or

. cord-connected reactor-control has been in use for an extended period, however, the cable stretches to a greater or less degree, thus introducing undesirable baclrllash and rendering'the tuning operation increasingly di'icult. "@ne object of my invention, ac cordingly, is to provide a `cable-connested controly device for a tuning reactor wherein lt has also, to a large extent, been customary to either provide the indicating' dials with permanent Wave-length or frequency* scale markings, rendering it necessary to shift the entire dial with respectY to the shaft voi a tuning reactor in the event that the'said scale markings do not` properly coincide with a permanent iiduciary mark, carried by the panel, `when the receiver is tuned, successive ly, to a plurality of frequencies. Another object of my invention,therefore, is to proy vide a tuning dial having a movable indicating-scale associated therewith, 4vvhich scale may easily be adjusted and tire-d vin the proper position during the manufacture of a radio receiving set. i

According to my invention 1T, provide 'a 31929. Serial No. S'm.,

control device, suitable for use in connection with a variable reactor, comprising a driven element axed to a movable portion of said reactor and a plurality of driving elements carried by an actuating shaft. l interpose a flexible cable, or a cord, between the driving and driven elements and, further, provide resilient mea-ns, preferably mounted upon the driven element, forma-intaining the exible connecting device under tension.

of the device, i dispose a discshape element upon the shaft adjacent to the driven element and provide a spring for holding the scale around, and firmly against, the periphery of the disc-shape element. The movable scale-mounting is capable of numerous modiiications, several of which will, hereinafter, be described in detail,

The novel Vfeatures that consider cliarf acteristic of my invention are set forth vvitli particularityin the appended claims. The invention itself, however, both as toits or- Y ganization'and its method of operation, to-

gether vvith'additional objects and advantages thereof?, will best be understood' from the following description of a specific embodiment,'when read in connection with the accompanying drawings, in Which: A Figure l is a perspective view of a gangcondenser comprising a preferred embodi nient of my invention, i j

Fig. 2 is a fragmentary vievv of a control device comprising an alternative embodiment of my invention,

lig. 3 is an end elevational view of the device illustrated in Fig. 1, certain non-essential details being omitted,

Fig. d is a detail view of a svviveled lamp mounting,

Fig. 5 is an end elevational view of the device illustrated in Fig. 4, and

Fig. 6 is a fragmentary view of a portion of the device shown in Fig. 1, illustrating the manner in which one end of :a scale may be adjustably anchored.

The apparatuslillustrated in Figs. 1 and 3 comprises a garlg condenser of the type shown and described in the copending application of Henry C. Forbes, Serial No. 198,153, filed June 11, 1927, and assigned to the Westinghouse Electric & Manufacturing Company.

The condenser comprises a one-piece metallic structure 1 which is shaped somewhat like a bath tub, having end portions 2 and 3, side portions 4 and a bottom portion 5. The side portions 4 are each cutaway intermediate the ends to below the level of the tops of the said ends, leaving a plurality of up-standing ears 6.

Insulating strips 7 are aflixed, by means of rivets 8, to the up-standing ears 6 land to the end portions 2 and 3 and extend parallel to the long axis of the structure.

A plurality of groups of stator assemblies 10 are suspended between, and supported by, the insulating strips 7 by means of a plurality of small bolts 11 or analogous devices.

Each end portion of the frame is provided with an opening through which extends a shaft 12 carrying a plurality of groups 13 of rotor plates.

Additional details of the condenser structure are well known to those skilled vin the art, the device being essentially that which was embodied in the hereinbefore referred to radio receiving set, Radiola 17, and, since they form no part of my invention, the said details need not be more specifically enumerated at this point.

A depending plate 14 is affixed to one end of the metallic structure 1. The plate is provided with a plurality of outstanding ears 15 having bearing openings through which r extends an operating shaft 16and an idlershaft 17. An actuating knob 18 is aiiixed to one end of the operating shaft and, normally, is disposed exteriorly of the front panel of a cabinet housing the condenser.

The shaft carries a plurality of small pulleys 19 and 20, to which the 'ends of a cable 21, ora similar flexible connecting device, are attached. The cable is wrapped a plurality of times around each of the small pulleys, in opposite directions, and the intermediate portion thereof is also wrapped a plurality of times around the periphery of a grooved cupslipe element 22 that is aliixed to the end of the rotor-shaft 12 immediately above, and adjacent to, the depending plate 14.

An idler pulley 23 is rotatably carried by the idler-shaft 17 and isso disposed with respect to the driving pulley 19 that the cable is guided into proper position on the periphery of the cup-shape element.

In order to prevent the cable from slipping on the surface of the cup-shape element, it passes around a snubbing post 24, affixed to the interior of the saidelement, and beneath aportion 25 of the rim of the element defined by bending minor peripheral portions 26 thereof inwardly.

A resilient tensioning device 27 is mounted interiorly of the cup-shape element, one end of the tension device being so disposed as to contact the cable after it leaves the snubbing post, and thereby, to exert a constant tension upon it.

The specific form of the resilient tension device is not an essential element of my invention, it being obviously replaceable by a helical spring or the like.

By reason of the fact .thatthe snubbingpost 24 is interposed between the tension device 27 and the end of the cable which is atlixed to the pulley 18,` forces originating in the said pulley are prevented from directly reaching the said tension device. The effect, therefore, of the tension device, upon the cable, is very gradual. Should the cable elongate, somewhat, during the operation of the control-device, the elongation will/be slowly taken up by the tension spring, but no substantial additional force will be placed upon the said spring by reason of the operation of the adjusting shaft. It will thus be seen that back-lash is prevented throughout the entire useful life of a control device comprising my invention. s j

A sectored disc-shape element 29 is mounted on the shaft 12, between the cup-shaped element 22 and the depending plate 14, the said disc-shape element vbeing rovided with a plurality of peripheral lprojections 30. One end of a translucent scale 31 is adjustably anchored, as shown in Fig. 6, to one of a plurality of ears 32 which extend outwardly from the disc-shape element. The scale is provided with a plurality of openings 33, each of the openings subtending an angle somewhat greater than the angle subtended by each of the peripheral projections 31 on the disc-shape element and being spaced along the length of the scale to correspond to the spacing of the said projections.

The scale is resiliently held in intimate contact with the periphery of the disc-shape element/29 by means ofa spring- 34, one end of said spring being anchored between one of the ears 32 and the cup-shape element 22, and the other end of which extends through anl opening in the end of said scale. By slightly loosening a screw 35, shown in Fig. 6, comprised in the anchoring device, the scale may, therefore, be moved circumferentially of the discshape element a slight amount, in either direction, during the process of manufacture.

End stops, (ngt shown) may be provided to prevent the condenser shaft from being rotated too far in either direction.

A swive-led lamp-mounting device 40 is disposed adjacent to the translucent scale. The lamp-mounting device, which is shown in detail in Figs. 4 and 5, comprises a socketholding portion 4l extending at right angles to a base portion 42. The base portion is embossed to providev a circular offset bearing surface 43, which surface is maintained tightly against the rear face of the panel by' means of'a mounting-screw 40 or the like. 'Ihe swivel-connection of the socket is such as to permit it to be moved out of cooperative relation with the translucent scale for the kpurpose of insertion or removal of a small lamp 45.

It is not absolutely necessary that one end of the translucent scale be anchored, an alternative form of the scale-holding means being shown in Fig. 2. Referring specifically to the latter figure, each end of the scale is pro'- vided with an opening into which the ends of the helical spring are inserted. The scale, therefore, in the alternative form, is tightly held against the periphery of the disc-shape element but is prevented from accidental movement with respect thereto solely by friction.

Although I have shown, in Fig. 1, a small transformer 51 for energizing the lamp, any convenient power-source may be utilized for this purpose.

It will, accordingly, be apparent that I have provided an improved control device for the variable reactors comprised in radio receiving apparatus, wherein back-lash between the driving and driven portions is ing variations.

entirely eliminated. My control device isv also advantageous in that the indicatin scale may be shifted at any time, either uring the process of manufacture or subsequentthereto, in order to compensate manufacturalso a valing means between said members, means carried by said driven member for keeping said exible means under tension and additional means carried by said driven member for preventing forces arising in said driving' 70 means from directly reaching said tension means.

3. A control device comprisin a driving" member, `a driven member, ilexi 'le connecting means between said members, resilient means carried by one of said members for keeping said flexible means 'under tension and snubbing means carried by one of said members for preventing forces arising in said driving member from directly reaching said tension means.

4. A control device com rising a driving member, a driven member, exible connecting means between said members, resilient means carried by one of said" members and contacting said iiexible means to maintain it under tension and additional means carried by said member for preventing forces arising in said driving member from directly reaching said tension means.

In testimony whereof, I have hereunto subscribed my name this eighteenth day of June, 1929. r

J OHIN KERRIGAN.

1. A control device comprising a driving member, a driven member, iiexible connecting means betweensaid members, means for keeping said flexible means under` tension and.means for preventing` forces arising in said driving means from directly reaching said tension means.

2. Acontrol device comprising a driving f member, a driven member, flexible connect-