US1765191A - Radio apparatus - Google Patents

Description

5 Sheets-Sheet 1 June 17, 1930. D F, ASBURY l,7 65,191 I RADIO APPARATUS Filed Feb. '7,v192'r 5 sneets-sheet 2 DOmyFL/sbwcy) June 17, 1930. D. F. AsBuRY I RADIO APPARATUS 5 Sheets-Shee'c 3 Filed Feb. '7, 1927 JungA 17, 1930. D ABuRY 1,765,191

RADIO PPARATUS Filed Feb. 7, 1927 5 sheets-sheet 4 t June 1.7, 1930. D. F. AsBuRY RADIO APPARATUS lFiled Feb. 7, 1927 5 Sheets-Sheet 5 "its Patemed June 17, 1930 STATES .PATNT OFFICE I ['DonsnY F, AsB'UnY, or BRooMns IsLAND, MARYLAND :RADIO Armin-Artis i Application filed February 7, 1 927.' Serial No. 166,516.

. My invention `relates to radio apparatus and has particular reference to improvements inoperating means for the movable parts of tuning units,

variable .plate condensers, my object being to such for example, as

provide `an Operating means of simple, ineX- pensive construction Whereby the 'movable parts ofa plurality of tuning units may be connected together for convenient collective and individual operation for the Various purposes set forth in m'y prior applications se- `rially numbered .683,756; 689,338; 10293; 172148088;8a448 '108,074v and 155,016 and in my `VMore particularly .it'is my-purpose to provide a single operator for -the movable parts v 'of a plurality of'tuning units so constructed and arranged with respect to the units that the movable parts of the units may be moved thereby both collectively and individually and yet theoperator lcan have 'only a single definite position when all of the'units are ac- Vcurately in tune'witli any given-Wave length,

the result being vthat it is possible according to my present invention so to log the operator when-it is 'applied for example to a plural tuning unit radio receiving set that a person desiring to tune the set with a particular broadcasting station the wave length of which is known may do so immediately simply by setting the operator in the one definite known position in which it is possible toset it tohave all unitsltune' accurately with that wave length,` the'necessity offirst securing rough 'and then fine adjus'tments of the 'different ;units as has heretofore been required to secure the same result thus being entirely eliminated. without the necessity of 'employing means as propjotsedV in certain of my prior applicat'ionsjand patents to move the movable parts Vof the units variable amountsjwith respect 'to one another as they are lmoved collectively.`v r a j In order'toaccomplish the foregoing pur. pose Iprovide an operator having different v, v w

'plural Vtuning' unit radio apparatus disclosforms oftmovemen'ttoflmove the 'movable 'the'apparatus shown in Figures 1 and 2;

ture shown in Figures 7 and 8';

'parts of the tuning units thereof;

in connection with such an operator it is my fu'rtller purpose to provide means for indicating When it is in position to cause all units to tune with any particular Wave length thereby to facilitate setting of the operator in its different definite positions.

With the foregoing and other purposes in view, my invention consists inthe novel features of construction, combination and arrangement of parts as will be hereinafter 6 more fully described, illustrated in the accompanying drawings 'and defined in the appended claims.

. In the drawings, wherein like characters of reference denote corresponding parts in the different'views Figure 1 is a'front elevation, partly in section, of a pluraltuning unit radio apparatus showing a preferred form of my improved Operating means associated with the movable parts of said units;

Figure 2, a horizontal section on the line '2-2 of Fig. 1

F igure 3, a central Vertical section through Figure 4, a detail perspective of an element of my improved apparatus;

Figure 5`, a fragmentary sectional view through a plural tuning unit radio apparatus showing a modified form of my improved operating means associated With the movable parts of the tuning units thereof Figure 6,' a view similar to'Figure 5 showing a positionvofithe operator disclosed in Fig. 5 for Operating the movable part of one '-85 of. the tuning units individually;

Figure 7, a horizontal 'section through a plural tuning unit radio apparatus disclosing a further modified form of my improved Operating means for the movable parts of the tuning units thereof;

Figure 8,,a'ivertical section on the line 8-8 of Figure 7;

Figure 9, a front elevation of the struc- Figure l1O,`a. horizontal section through a ing'still'another modified form of'my improved ioperatingimeans for the movabl Figure 11, a front elevation, partly in section, of 'the structure illustrated in Flgure 10.

Figure 12, a viewv similar to Fig. 1 disclosing still another modified form of my in- 5 vention; and

, Figure 13, a Vertical section through the structure shown in Fig. 12.

Refrring to the drawings in detail, it willV biobserved that the tuning units theimovf a e vated y my improved Operating mechamsms are indicated in the disclosure of each .form of my invent-ion as variable'plate cndensers', each including, as usual, a set of stator plates a and a set of rotor plates b, the latter constituting the movable .parts of said, units. It is w to be understood, however, that the tuning unitsvare illustrated herein as variable plate ciondensers merely for convenie'nce, since they may be of any other form, such, for example, as coils, the only essential being that each of :them include a part movable to effect tuning thereof vwith different wave lengt-hs in order `that my improved mechanisms may be adapt- 35 ed to t eir operation. y 'w In a preferredembodiment of my invention as disclosed in Figures 1 to 4, the tuning units, two in number, are mounted in any suitable manner upon' any suitable support i such as a base board in side b sidezspeced relation and with the axes lo their rotor shafts 12disposed in parallelism; On an end w of the rotor shaft vof one ``unit is fixedaspur y gear 14 and on the correspondin end of the rotor shaft of the other. unit is ed a spur gear 16. A shaft 18, located betweenthe tuning units and tdisposed normally in parallelism with the rotor shafts of said units, is =pivoted at one end as at to a brecket 22 secured to the base board 10 for swinging move- ,nient in a plane atA ri ht angles to a plane including the axes of ie rotor shafts of the tuning units, and upon the other end rtion of said, shaft is rotatably mounted aj ,ob or dial 24: which extends through an opening 26 in a panel board 28to the exterior of the ap- `paratus 'whereit may begrasped for manipu- V ation. Opening I26Vis elongatedzin the difrection of pivotal movement ofshaft 18 and one side Vwall 30 thereof isjdisposed y I ntially in alinement with the plitehl line of ,of gear 14 While the ot er side wall ,thereof is disposed substantially in alinement with. thepitch :line ofthe teeth of gear 1,6,2this for. a Purpose which will esently appear. A spur plnion 34 is 106812 between ,and inmeshlwith the spur gears'lt, 16,'and

' is connected to the knob ,ordiai any suitableyieldable means such as'the circular- ;go ly corrugated: web 36 inusta'ated in'Fig. 1

1whex'eb the knob'ordiitl'mafbemovndlater-` ar portion 38 thereof a 'ainsteither of Vthe walls or 32 without a ectingthe toothed v,a5 -engagement between said'spurjpinion and arts of which are intended to be operi J, -cated gener umts, e letter form of other, bnt'are arran vtions, the ,amount of H om.

I said spur gears, said web serving at the same time to assure rotation of the spur pinion 34 at vall times with the knob or dial 24. Between the knob or dial 24 and a flange 40 on shaft 18 is arranged a crimped washer 42 affoit'ng :i frietixlil evioe' serviihg to resist ro len oor respectto' Shift is, ;a-'ima sdgofiai 'zm-mmm in anyrotatable adlilusted position in which it is placed. Anot er device indilly at 44 s to resist pivotal niovement of shaft 18, so that'it'will remain manypivotall adjusted ition in which itl is plaoedsai device 44 ing secured to. a fixed support such as base board 10 and in- .o cludin as shown in Figura 4,' a aifr of yielda ie arms ie, 48 between ;which Shea is slidable, the normal diance between said arms being less than the diameter of the shaft whereby the necessary friction is aflorded by *u sidfiarms to resist pivotal'moiements of the'- s a s Frictiondevice 44 serves to maintain shaft 18 normally midway between the rotor shafts of the t vunits soathat' the cylindricel Q0 surface 38 o the knob or dia! 24 is spaoedo slightly from both of the side Walls 30,32 of' the opening 26 said shaft :be' capable'of shghtlflexure, howevenso'that y laterall cylindn ;surface ma :bemoved mte'yen' gaglexnenteiter e A t wlllo or 32 of sm opening ares tisar ment it is apparent `that knob jo: dial'gl filmie` two difierent forms *ofmowmntby :which the s llir gears` I, entiy ty: a moya e erfs 0 t tnntngyunits'ma moved colectively, onejofV said form moyement beingrotation'when the lindrical surface 38 is s aced from both of :be walls 30, 32 and the ot er being a body movement i in a direction at ri ht angles to a' plane inciu the axes o thexrotorishafts of v ,i movementbeing per-n mitted by pivotmg the shaft 18 as 81720 anlflpg by elongatmg the opening- 26 in the direction o pivotalA movement of shaft a; afore- The'tuning sl dywan' I 'n reversed relationhu so that rotation offpinion, fone direction' wills'erve increase; the ampuntiof overlap between the tort. o v tator plates of i I 'are inne yponsndlmoburdioimma, i

impart movements to the movable parts of the units 'to secure like tuning results from each of them, while movement of said knob or dial bodily will impart movements to the movable parts' of the units to' secure unlike tuning results therefrom. On the other hand, by pressing the knob or dial slightly laterally in one direction, its cylindrical surface 38 will be caused to contact with the wall 30, so thatby'then rotating said knob or dial while maintaining its cylindrical surface 38 in contact with said wall a rolling action of the knob against Vsaid wall will occur and spur pinio-n 34 as a result will, in effect, pivot about spur gear 14 and as a consequence rotate spur gear 16 individually, spur gear 14 remaining stationary due to the wall being alined with the pitch line of the teeth of said gear, so that Vas the knob rolls against said wall, pinion 34 also rolls against gear 14. By pressing the knob laterally in an opposite direction and simultaneously imparting a rotary movement thereto, cylindrical surface 38' will roll on wall 32 Vand as a consequence pinion 34 will pivot about gear 16 withV resultant individual rotation of gear 14.

It will be noted that when the knob or dial is rolled against either wall 30 or 82 the spur gear which is alined with the wall against I 50 I iustnient to which the knob or dial is rolled will be held against rotation bythe pinion 34 due to the rolling action of the latter against the gear.

.arrangement of parts As a result of the having the mode of operation described in the foregoing the manipulation necessary to tune both of the tuning units accurately with particular wave length is apparent:

the movable parts of the units collectively until each is vapproximatelyin tune with the 'wavelength desired.v When this has been done the operator then may be shifted bodily to lncrease the capacity of oneJ unit and dev lc-rease the capacity of the other if this is necessary to bring each unit accurately in tune with the `'desired wave length, or, if one unit has been tuned accurately with the desired wave length as a result of the collective operation and only the other unit requires further adbring it into accurate tune with the same wave length, operation of the individual' unit requiring adjustment may be ef- Vfected by .rolling the knob against one or the other of the walls 30 or Since the pinion 34 is located between and remains at all times in mesh with the gears 14, 16 and since the latter are rotatable in .opposite directions to accomplish the same tuning effects in each unit, it follows that the knob or dial 24 can have only a single definite position when each unit is accurately tuned with any particular lwave length, and thisA being true it follows that the various definite positions assumed by the knob when the apparatus is in accurate tune with dif- `tion of rotation as well as a ferent wave lengths,l respectively, may be logged or indicated, so that whenever it is desired to tune the apparatus with a particular wave length all that is necessary is to move the operator to the single definite position it can occupy when the units are in tune with, that wave length. In other words, since the lnob 24 must have a definite posidefinite position bodily when both units are in tune with a particular wave length, it is manifest that once the correct rotated and bodily moved positions of the knob are known for correct tuning of the units with a particular wave length any suitable means may be employed for indicating these positions, so that if subsequently it is desired to tune the apparatus with that partciular wave length, such tuning may be accomplished instantly simply by positioning the knob in 'a definite position through the instrumentality of said indicating means. F orexample, an index such as an arrow 48 may be provided on the panel 28 and graduations 50 may be provided on the 'flnob or dial 24, so that when a particular one ofthe gi'aduations on the knob or dial is registered with the arrow on the panel the person Operating the apparatus will know that the correct rotated position of the knob or dial has been reached to assure correct `tuning of thev units with' a particular wave length. If the lnob or dial could partake of material movement bodily a second index such as an arrow could be provided on the panel for registry with another of the graduations on the knob or dial to indicate the correct position of the knob or dial bodily for correct tuning of the units with that valve length, but since bodily movement of the knob or dial rotates the movable parts of the units oppositely with respect to one another as regards tuning effects and' since such movement of the lmob or dial must therefore of necessity be relatively slight as it serves merely to produce a synchronized relation of the ble to provide means which will indicate in a magnified manner movements of the knob or dial bodily to facilitate accurate bodily positionment of the same. To this end I mount 011 the panel 28 a short shaft 52 and fiX to one end thereof exteriorly of the panel an arm 54 terminating in a pointer 56 adapted for Cooperation with a series of (rraduations 58. Shaft 52 further has fixed tchereto a short arm 60 to which is pivoted one end of an arm 62 the other end of which is connected with the shaft 18. Consequently any shifting movement of the knob or dial bodily will act through this mechanism to swing the arm 54 and its movement w1ll be propor-tionately greater than the movement of the knob due to the difference in length of said arm with respect to arm 60. Since movoment of the knob or dial bodily will swing the arm 54 it follows that'swinging movement' of Vsaid arm will'rnove the `knob orjdial bodily and sinoe it is desirable to utilize the arm 54' to move the knob rather than 'to move the 'knob directly, althouy h either of these modcs of operation may practiced, the arm 54 preferably Visprovlded with a small knob 64 as a means offco'nven'iently swinging the same; Thus, `once the 71,0 correct rotated and bodily moved position i of the knob 24 is known to assure accurate 'tuning of both units with any' particular wave length the only operation required to tuue the apparatus at any time with that wave is vto grasp the knob 64 and move vit' to register its pointei` 56 with a particularone of the graduations 58 and rotate the knob or dia-124 until Va particular one of the graduations thereonis registered with the index 48. In further explanation of the fact that the knob or dial 24 can have only a single definite tion when both tuning units are tuned accurately with 'any.` particular 'wave length it may he p'ointedl out that if the correctrotated 315 land'bodily moved positions of the knob or dial were known lfor accuratetuni'ng of 'the units with every wave length vwithin the capacity of.l the 'apparatus no necessit sign of means for individual y operating the ,unitsl would exit, asu'ch means 'never is used in tuning the apparatus with anyparticular v`wave length onceV 'the' correct rotated and bodily moved positions'ofthe knob or'dial to secure accurate tuning of the units with that a* wave length are known. Since, however, it is 'necessary to adjus'tthe units individually when 'determ'ining initially the correct rotated and bodilymoved positions ofthe knob or dial to secure accurate tunin of both units *40 Vwith an particular wave lengt the utility of means or individuall adj usting ltheunits is apparent, even thoug such means'is never used for tuning the units'with any particular wave length once the one definite position of 15 the knob o di l to secure accurate tuning of the units with thatwave length has been determinedi z i i In the embodiment of my inve'ntion illustrated in Figures 5 and 6 the tuning units, valthou h not shown, are asslned to be duplicates o 'and to he arranged in the same manl.ner as the tuningunits shown iri Figures 1 and 2, andto carry, res ctively, ,on' their rotor shafts, spur gears 14 162 Located between and 'in mesh with said gears is a' spur pinion 34' carried by an operatin knob or dial 2-1' which knob or dial exten sthrough lan opening 26' in a panel 28' to the exterior of the apparatus where it may be rasped for manipulation. Said knob or dia is pivoted for universal movement u on a s herical enlargement 66 at one end o a sha 18' which i shaft is pivoted at its other end to a bracket (notshown 05 bodiment o my invention shown in Figures Vto retainshaft L8' inV any pivotall'o nldjlu sli for the provi- .ou er 'convex surface of iiange 72,-` twill tion of the knob 24' .Glam 'rtbtating from the support .with Whlch ii? imw.

the same as shaft 18 of the em- 1 to 3, so that it is nou-rotatable hut ean'swing in' a direction at ri ht angles to aplane including the axes o the rotor shafts of the tunin units. A friction device ,44' similar to the'frlction device 44 of Figures 1`to 3 service ;"70

osition in which' it is placed, and d the. obor dial24' normally in` axi'al' alinmen't with said shaft, a straight resilientrod'QS small diamet'eir is .eng'a d neatl at one'ehd w; `'n an opening in the en argeme'n 66 whichi other endti rigid with said shaft and at its engaged neatly in an opening'i'n a plug mem'- her 70 which is rigid with 'said knob ordial. This rod while thus serving normally to main- 'ao tain the axis of the knob ordial 24' in aliname-nt with the axis of shaftj18' nevertheless permits pivotal movement of the knob or dia'l about the enlargement 66 as is apparent. Rigid with the knob or dial is an annnhfl flange 72 having a convez;l outer surface di posed in .alinement .with pitch line lof ti'ip teeth of pinion 3112 j pair'of fixed sup 74, 76 are located,j,respectively, adj'acen thf points of contact of pinion 84' with the 14", 161ml thestsupppfnorlalli atj spacd relation ;with respect a ;the appareut from thi'sarrangementthat. o

a W a spu- 'e 14g 16' 'i s exactly .thesame as described iu gen. nectlonfwit knob 245 ofFiguresl to 4:, exceg that instead of acylindrical surface' of t knob bein rollable against one side tor' other oft e opening in the panel thro which the knob cxtends to secure individual operation of the units, this result is attgm' in them diied form of my invention tiltmgt knob as shown in Fig. 6 to' r' theto'uter face of lflan e 72 intocontact wi 105 0119.91: the otherfof t e sup orts. 74f,76

the" knob so t at it will bylpivoti thereqn to move the. car remote from sai upport individually. auf no essentialrespects this modified form ,of-any inventinnjhasy the same mode :of operation accomplishes the same vresults as the-,W shownmFiguresl to4. x `.1'.

= In Figures 7 to9 .of the drawingslxhaikm illustrated another ;embodiment of my? inyention I which diflers from the embodimants thereof shown in Figures 1 to 6 mainlylinthat 'bevel gears instead ,of spur gearsconstit'ute the driving connection between. the operat o knob and the ,rotors ofthe tuning units. f producing this latter form of my inventinn the tuning units are mounted` in any desired manner in relative spaced relation upon a suitable support such as the base boardlrii'iW'5 of the apparatus with their rotor shaftah alinement with one another, adjacent eiids of said rotor shafts being equipped with bevel gears 142 16, respectively. A bracket 22", also secured to the base board, carries a pivot 13 pin'Oa, the `axis of which is inalinement with the axes of the'rotorshafts of the tuning said'arm iii any.. pivoted position in which it is placed. An'annular flange 38a on the knob h'as a conical surface for cooperation with either ofy a pair of fixed supports 80.1, 82'? which supports inay conveniently be carried by the frame portions of' the respective tuniugslunits. Support 30a has a'surface disposed in alinement with the pitch, line of the teeth-'ofgear 14l while support. 16EL has a surface disposed in ali'nement with the pitch line of.l the teeth of gear 16a. VAs a result of this arrangemen't it is apparent'that by pressing the knob 24laterally its flange 88a may be caused to contact with one or the other of the 'supportsrOaV or`32a, so that .by then rotatingthe fknob it willi rollagainst'the support with ;which flange 38asis in contact and in efiect pivot 'about its point of contact with said support to rotate the gear 14-1 or 16a, as the case may be,l which is' remote from said support, it being understood that the. amountof tilting movement `of. said knob necessary to `bring its fiange 38a into contact with either support 30a or 32u is so slight that'the normal play between'the teeth of bevel pinion 84'1 and-bevel gears 14a, e16a will `permit such movement.

-Knob 24a, as is obvious, is rotatable about its own axis as wellasswingable about pivot pin '20a to move the gears 14a7 v16a collectively and for the same reasons set forth in connection with'the dlsclosure of Figures 1 to 4 of the drawings said knob canhave only a single Vdefinite position when the units are in accu- -rate tuiie with any particular wave length. vFurtherniore said knob is graduated as at 'arm 54a is Vdisconnected therefrom, said knob may have unlimited swinging movement bodily about pivot 20a for rotating the gears 14a, lfl collectively7 in which event the supports 30a, 82a will extend for a considei'able disi tance concentric to the axes of the gears 14a,

16a; so thatin any bodily moved position of said ltnob itmay be pressed laterally against said supports to move said gears individually.

In Figures 10 and 11v I have illustrated a further modification to 'show that it Yis possible to retain the advantages inherent to the forms of my invention previously-disclosed in a structure including an operator common to a pair of tuningunits having only rotary movement` to move the movable part of one of the units and which is rotatable, swingable bodily and rollable to move the niovable part of the otherunit, while at the same time having only a single definite position when both units are tuned accurately with any particular wavelength. According to this form of my invention the tuniiig units are mounted one behind the other with the axes oftheir rotor shafts disalined, but extending in parallel directions equal distances 'radially from a spherical pivot member 20b and spac'ed circumferentially lwith respect to said pivot member 90 apart. A spur gear 14b is fixedto the rotor shaft of one unit and a spur gear 16b is fixed to the rotor shaft of the other unit. The sphericall pivot member is carried by a bracket 22b secured to any suitable fixed supportito which the tuning units are secured and is located in the plane of the gear 14b of one of the units as shown. Mounted on said pivot member for universal movement with respect thereto is a spur pinion 7 S which meshes with spur gear 14. Fixed to said pinion is a shaft 18h which extends across the other tuning unit and has fixed thereto an operating'knob 24') carrying a spur pinion 34b meshing with gear 16h. Knob 24b extends through an opening 26h in a panel 28 and includes a cylindrical surface 38b adapted for cooperation with a wall 32b of vsaid opening which, as shown in Fig. ,11, is

in alin'ement with the pitch line of the teeth of gear 16.- 1 A short shaft 52'? is mounted in i panel 28h and carries at one end ,an indicatoi' arm 54h and at its other end a short arm 60b to which is pvoted'on` end of an arm 62 which, at its other end, is pivoted to shaft 18h. A friction device 44b similar toV that shown in Fig. 4 engages arm 62h. As a result of this arrangement it is apparent that with the cylindrical surface 88b spaced from wall 82 rotation of the knob 24b will rotate the gears 14h, 16b collectively, while gear 16b may be rotated individually simply by moving said knob laterally without rotatingsame. On

Vthe other hand gear 14b is rotatable individuallyv by pressing the knob to bring its cylindrical surface 38b into contact with wall 82h and then rotating the knob, this resulting in rolling movem'ent of the pinion 34b with respect to gear 16b without moving the lattei' and iii rotation of pinion 78 to rotate gear 14. Knob 24h is graduated as at 50b for cooperation with an index 48b tov indicate the one definite rotated position it can occupy when both units are accurately tuned with any particular wave length, while arni 54b indicates thev one definite bodily moved position said w knob .can occupy when the units are accuil'ntel in tune withany' particular4 wave have illustrated a further modifieation inventiondiflering from the eceding embodimentsthereof essentially m that means is 'provided wherebyzthe operator, "instead of being -rofimbl'e against a Permanent fixed support or sup forcmoiing the movable parts of thev tuning units 1 individually, is rollable against a, movable' part of one unitto move the movahle rt of the other .unit individual- }y,"=the 'mova le 'part of thefirst unit being held. against'movement dungadjustment of the lniovable part of .the second unit whereby iteonstitutes'; in'eflecta fixed-support from which the operator reacts tomove the movable party of the second unit. In this yeinbodiment ofmy invention the tuning units are mounted in the same'relationas shown'in Figura 1 of the drawings, that is, abreast and s aced with res 'to one another and with 'axes of their rotor shafts" Vdisposed in parallelism. On correspondin ends of said rotor shafts are fi'xed, respective spur gears 14, 16c and Ameshing-with said spur gears is a spur pinion 34 carried by a knob 24 which is rotat- 'ably mounted on a shaft J and extends through an ning 26 in a anel 28to the exterior'of t e apparatus w ereit may be igrasped for manlpulation. An arm 18'* i'is 'pivoted at one end as at 20c to a bracket 22` for swinging movement -in 'a direction at right angles to a plane including the Amies of the rotor shafts'of the tuning units. The shaftV` 80l is piv'oted at an intemiediate oint in its length, as at 82, 'to the' free'end 0 arm 18 for swinging movement `-in a direction at right -ang es to the directionof swinging movement' of said arm,iand carried by vthe end of said: shaft op ite tothe end there- 'of on whiohknob 24 Is mounted is a small roller 84. The spur gears 14, 16 are provided 'with lateral flanges 86, 88, respectively, with which` brake levers 90, 92 are adapt'ed for o0- 'Ioperation res ctively, said brake levers being intermediate y pivoted to suitable fixed supports and each having one end disposed in fproximity to the inner face of its related flange and its other end di sed in proximity to* roller`84. As a result o this arran `ment it is manifest that knob 24'z is rotata le on shaft S0 as well as bodily' swingable about the pivot 20:to rotatethe spur ars 14, 16 collectively. It is manifest also t at by swinging said knob in one direction about pivot 82, vfoller 84 will'enga'ge one of the levers or 92 and swing same on its pivot into braking engagement with its related flange 86 or 88 as the case may be, while by swinging said knob about its piv'ot 82 in'an opposite direction Vroller 84' will be caused to engage. the other of said levers and swing same on its pivot 7 05 into braking engagement with its related i nzrignrzs 12 ma lis ufam drswinsi o my flange..i.Thus, for example, if knobl 24 is sw to' the right asshown in Fig. 12 roller S'-Wi l+b0 mvedfl) the? IOBO 61,1 -H' ='-fi with -one-'endof lower Wandswing saimmnfi` its pivot uhtilz its `other end. is foreedfiatoj, frictional brak' engagement withthe flow w 8601i gear 14% f nqw'mob 24. is rotaiflfl; spur gear 34obviousy mint ro'll oaspurgflr 14 since the latter is hold, against rotaflli andby so roli' 'onspur gear 14' the other v spur gear 16' a 'be rotatd individually'y W, said spur pinionaslse is'ohvioua' In exaotl the same manner spur gear 14% may be rotae ed: individualy by first swringing knob 24'! to the left as shown in Fig. 12 and then ing said knob.v An indicator arm 54 is coknected withiarm 18' in the same mannemafl shewn'in-Fig. 1 to indicate the difierentfdetinite 'bodily'moved positions of the knobfl! when the unitsare in 'accurate tune with tioular wave lengths, and graduations arepm' vided `ou'V saidknob for cooperation with zl!! indeivo 'the panel to indicate the difisrfl tlefiniteA rotated positionsof said knobm the unitsfane accurately-'in tune withpayumiar wm lengzhs'a being for thesame reasons set. forth in conneetin with the'structure of Fig.i.1,' knob 242m have' only a single definite position when unitsharein time with an'ypart1cular len '--m From-the foregoin description ;na

in connection with t e aocompanying dni/i:-

ings it'is'believed' that theconstructionmy eration and advantages'of my present-inna' ;1.00 tin will"-be fully i'understood. I deslredio point' out, however, that while I have. closed herein'tcertain specific'embodimenfv zm' *invention various changes and d a ditions may be made in' and to of them withinz the spirit-and seope of my. mventaon' as defined` in the appended claims.l V ',I`! laim:g

1.-In r'adio apparatus, a pair of tmmxg units a part of each? of which is movablsgmi operator having continuous driving connection withth'eflmovablepart of each unit, means "whereby' saidbperator is movablei'o move the mcable partsof said units collectively :and individually, and means coopemtin with sa'id operator toV revent movemea't ofgv one unit while the ot er unit'is 'being moved individually by-the operator.

2. 'In radio apparatus,'an adjustable tun'- ing unit,`a rotatable and bodily 'movableactuali' 'constantly in driving) connection'vith said unit, means opel-able* y either of movements' independently of the otherwto adjust said unit, andl a `'ixedsupport against which said actuator is adapted to be rolledz-ito adjust said unit. i 1

3. In radio apparatus, a plurality of,V adjustable tuning units, a rotatable andbodily movable actuator constantly in driving fconnection with said units, means operablejby o V either of said movements independently of the other to adjust said units collectively, and effective by a combination of said movements to adjust one of said units individually, and afixed support against which said actuator is adapted to be rolled to produce a combined rotary and body movement thereof.

4.111 radio'apparatus, a plurality of adjustable tuning units, a rotatable and bodily mova-ble actuator constantly in driving connection 'with said units means operable by either, of said movements independently of the other to adjust said units collectively, w and effective by a combination of'said movements to adjust each of said units individually, and a fixed support having separate surfaces against one of which said actuator is adapted to be rolled to produce a combined rotary and body lmovement thereof effective .to adjust one of said units individually and against another of Which'said actuator is adapted to be rolledto produce a combined rotary and body movement thereof effective to adjust another of said units individually. i 5; In radio apparatus, a plurality of adjustable tuning units, Van actuator having different forms of movement, connections between said actuator and units responsive to one form of movement of theactuator, to .30 adjust said units collectively in the same tuning status direction and to another` form of movement of the' actuator to adjust said units collectively in opposite tuning status directions, and means toindicate the correct amount of each of said forms of movements with respect to the other to bring each of said units into accurate tune with any given wave length.

6. In radio apparatus, a plurality of ro- 40 tatably adjustable tuning units, a gear Wheel on each unit, a pinion located between and in mesh with the gear Wheels on said units, an actuator for said pinion, said pinion being mounted for rotation and for shifting movement bodily and being effective by either of said movements independently of the other to adjust said units collectively and by a combination of said movements being effective to adjust said units individually, and a fixed support having surfaces against which said actuator is rollable to produce combined rotary and bodily shifting movements of said pinion effective to adjust said units individually. o In testimony whereof I hereunto afi'ix my signature. DORSEY F. ASBURY.

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